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Commit | Line | Data |
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95fc7512 | 1 | #include "cache.h" |
697cc8ef | 2 | #include "lockfile.h" |
85023577 | 3 | #include "refs.h" |
cf0adba7 JH |
4 | #include "object.h" |
5 | #include "tag.h" | |
7155b727 | 6 | #include "dir.h" |
daebaa78 | 7 | #include "string-list.h" |
95fc7512 | 8 | |
3581d793 SB |
9 | struct ref_lock { |
10 | char *ref_name; | |
11 | char *orig_ref_name; | |
12 | struct lock_file *lk; | |
13 | unsigned char old_sha1[20]; | |
14 | int lock_fd; | |
3581d793 SB |
15 | }; |
16 | ||
bc5fd6d3 | 17 | /* |
dde8a902 DT |
18 | * How to handle various characters in refnames: |
19 | * 0: An acceptable character for refs | |
5e650228 JH |
20 | * 1: End-of-component |
21 | * 2: ., look for a preceding . to reject .. in refs | |
22 | * 3: {, look for a preceding @ to reject @{ in refs | |
23 | * 4: A bad character: ASCII control characters, "~", "^", ":" or SP | |
dde8a902 DT |
24 | */ |
25 | static unsigned char refname_disposition[256] = { | |
5e650228 JH |
26 | 1, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, |
27 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, | |
28 | 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 2, 1, | |
29 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 4, | |
dde8a902 | 30 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
5e650228 JH |
31 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 4, 0, 4, 0, |
32 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
33 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 4, 4 | |
dde8a902 DT |
34 | }; |
35 | ||
581d4e0c MH |
36 | /* |
37 | * Flag passed to lock_ref_sha1_basic() telling it to tolerate broken | |
38 | * refs (i.e., because the reference is about to be deleted anyway). | |
39 | */ | |
40 | #define REF_DELETING 0x02 | |
41 | ||
029cdb4a | 42 | /* |
8df4e511 | 43 | * Used as a flag in ref_update::flags when a loose ref is being |
029cdb4a RS |
44 | * pruned. |
45 | */ | |
31e79f0a MH |
46 | #define REF_ISPRUNING 0x04 |
47 | ||
16180334 MH |
48 | /* |
49 | * Used as a flag in ref_update::flags when the reference should be | |
50 | * updated to new_sha1. | |
51 | */ | |
52 | #define REF_HAVE_NEW 0x08 | |
53 | ||
8df4e511 MH |
54 | /* |
55 | * Used as a flag in ref_update::flags when old_sha1 should be | |
56 | * checked. | |
57 | */ | |
16180334 | 58 | #define REF_HAVE_OLD 0x10 |
8df4e511 | 59 | |
dde8a902 DT |
60 | /* |
61 | * Try to read one refname component from the front of refname. | |
62 | * Return the length of the component found, or -1 if the component is | |
63 | * not legal. It is legal if it is something reasonable to have under | |
64 | * ".git/refs/"; We do not like it if: | |
bc5fd6d3 MH |
65 | * |
66 | * - any path component of it begins with ".", or | |
67 | * - it has double dots "..", or | |
68 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
5e650228 JH |
69 | * - it ends with a "/". |
70 | * - it ends with ".lock" | |
bc5fd6d3 MH |
71 | * - it contains a "\" (backslash) |
72 | */ | |
bc5fd6d3 MH |
73 | static int check_refname_component(const char *refname, int flags) |
74 | { | |
75 | const char *cp; | |
76 | char last = '\0'; | |
77 | ||
78 | for (cp = refname; ; cp++) { | |
dde8a902 DT |
79 | int ch = *cp & 255; |
80 | unsigned char disp = refname_disposition[ch]; | |
81 | switch (disp) { | |
5e650228 | 82 | case 1: |
dde8a902 | 83 | goto out; |
5e650228 | 84 | case 2: |
dde8a902 DT |
85 | if (last == '.') |
86 | return -1; /* Refname contains "..". */ | |
87 | break; | |
5e650228 | 88 | case 3: |
dde8a902 DT |
89 | if (last == '@') |
90 | return -1; /* Refname contains "@{". */ | |
bc5fd6d3 | 91 | break; |
5e650228 | 92 | case 4: |
dde8a902 DT |
93 | return -1; |
94 | } | |
bc5fd6d3 MH |
95 | last = ch; |
96 | } | |
dde8a902 | 97 | out: |
bc5fd6d3 | 98 | if (cp == refname) |
dac529e4 | 99 | return 0; /* Component has zero length. */ |
f3cc52d8 JN |
100 | if (refname[0] == '.') |
101 | return -1; /* Component starts with '.'. */ | |
7108ad23 MH |
102 | if (cp - refname >= LOCK_SUFFIX_LEN && |
103 | !memcmp(cp - LOCK_SUFFIX_LEN, LOCK_SUFFIX, LOCK_SUFFIX_LEN)) | |
bc5fd6d3 MH |
104 | return -1; /* Refname ends with ".lock". */ |
105 | return cp - refname; | |
106 | } | |
107 | ||
5e650228 | 108 | int check_refname_format(const char *refname, int flags) |
bc5fd6d3 MH |
109 | { |
110 | int component_len, component_count = 0; | |
111 | ||
9ba89f48 FC |
112 | if (!strcmp(refname, "@")) |
113 | /* Refname is a single character '@'. */ | |
114 | return -1; | |
115 | ||
bc5fd6d3 MH |
116 | while (1) { |
117 | /* We are at the start of a path component. */ | |
118 | component_len = check_refname_component(refname, flags); | |
dac529e4 | 119 | if (component_len <= 0) { |
bc5fd6d3 MH |
120 | if ((flags & REFNAME_REFSPEC_PATTERN) && |
121 | refname[0] == '*' && | |
122 | (refname[1] == '\0' || refname[1] == '/')) { | |
123 | /* Accept one wildcard as a full refname component. */ | |
124 | flags &= ~REFNAME_REFSPEC_PATTERN; | |
125 | component_len = 1; | |
126 | } else { | |
127 | return -1; | |
128 | } | |
129 | } | |
130 | component_count++; | |
131 | if (refname[component_len] == '\0') | |
132 | break; | |
133 | /* Skip to next component. */ | |
134 | refname += component_len + 1; | |
135 | } | |
136 | ||
137 | if (refname[component_len - 1] == '.') | |
138 | return -1; /* Refname ends with '.'. */ | |
139 | if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2) | |
140 | return -1; /* Refname has only one component. */ | |
141 | return 0; | |
142 | } | |
143 | ||
144 | struct ref_entry; | |
e1e22e37 | 145 | |
28e6a34e MH |
146 | /* |
147 | * Information used (along with the information in ref_entry) to | |
148 | * describe a single cached reference. This data structure only | |
149 | * occurs embedded in a union in struct ref_entry, and only when | |
150 | * (ref_entry->flag & REF_DIR) is zero. | |
151 | */ | |
593f1bb8 | 152 | struct ref_value { |
6c6f58df MH |
153 | /* |
154 | * The name of the object to which this reference resolves | |
155 | * (which may be a tag object). If REF_ISBROKEN, this is | |
156 | * null. If REF_ISSYMREF, then this is the name of the object | |
157 | * referred to by the last reference in the symlink chain. | |
158 | */ | |
593f1bb8 | 159 | unsigned char sha1[20]; |
6c6f58df MH |
160 | |
161 | /* | |
162 | * If REF_KNOWS_PEELED, then this field holds the peeled value | |
163 | * of this reference, or null if the reference is known not to | |
2312a793 MH |
164 | * be peelable. See the documentation for peel_ref() for an |
165 | * exact definition of "peelable". | |
6c6f58df | 166 | */ |
593f1bb8 MH |
167 | unsigned char peeled[20]; |
168 | }; | |
169 | ||
f006c42a MH |
170 | struct ref_cache; |
171 | ||
28e6a34e MH |
172 | /* |
173 | * Information used (along with the information in ref_entry) to | |
174 | * describe a level in the hierarchy of references. This data | |
175 | * structure only occurs embedded in a union in struct ref_entry, and | |
176 | * only when (ref_entry.flag & REF_DIR) is set. In that case, | |
177 | * (ref_entry.flag & REF_INCOMPLETE) determines whether the references | |
178 | * in the directory have already been read: | |
179 | * | |
180 | * (ref_entry.flag & REF_INCOMPLETE) unset -- a directory of loose | |
181 | * or packed references, already read. | |
182 | * | |
183 | * (ref_entry.flag & REF_INCOMPLETE) set -- a directory of loose | |
184 | * references that hasn't been read yet (nor has any of its | |
185 | * subdirectories). | |
186 | * | |
187 | * Entries within a directory are stored within a growable array of | |
188 | * pointers to ref_entries (entries, nr, alloc). Entries 0 <= i < | |
189 | * sorted are sorted by their component name in strcmp() order and the | |
190 | * remaining entries are unsorted. | |
191 | * | |
192 | * Loose references are read lazily, one directory at a time. When a | |
193 | * directory of loose references is read, then all of the references | |
194 | * in that directory are stored, and REF_INCOMPLETE stubs are created | |
195 | * for any subdirectories, but the subdirectories themselves are not | |
196 | * read. The reading is triggered by get_ref_dir(). | |
197 | */ | |
d3177275 | 198 | struct ref_dir { |
e9c4c111 | 199 | int nr, alloc; |
e6ed3ca6 MH |
200 | |
201 | /* | |
202 | * Entries with index 0 <= i < sorted are sorted by name. New | |
203 | * entries are appended to the list unsorted, and are sorted | |
204 | * only when required; thus we avoid the need to sort the list | |
205 | * after the addition of every reference. | |
206 | */ | |
207 | int sorted; | |
208 | ||
f006c42a MH |
209 | /* A pointer to the ref_cache that contains this ref_dir. */ |
210 | struct ref_cache *ref_cache; | |
211 | ||
d3177275 | 212 | struct ref_entry **entries; |
e9c4c111 JP |
213 | }; |
214 | ||
89df9c84 MH |
215 | /* |
216 | * Bit values for ref_entry::flag. REF_ISSYMREF=0x01, | |
d0f810f0 RS |
217 | * REF_ISPACKED=0x02, REF_ISBROKEN=0x04 and REF_BAD_NAME=0x08 are |
218 | * public values; see refs.h. | |
89df9c84 MH |
219 | */ |
220 | ||
221 | /* | |
222 | * The field ref_entry->u.value.peeled of this value entry contains | |
223 | * the correct peeled value for the reference, which might be | |
224 | * null_sha1 if the reference is not a tag or if it is broken. | |
225 | */ | |
d0f810f0 | 226 | #define REF_KNOWS_PEELED 0x10 |
28e6a34e MH |
227 | |
228 | /* ref_entry represents a directory of references */ | |
d0f810f0 | 229 | #define REF_DIR 0x20 |
cf0adba7 | 230 | |
28e6a34e MH |
231 | /* |
232 | * Entry has not yet been read from disk (used only for REF_DIR | |
233 | * entries representing loose references) | |
234 | */ | |
d0f810f0 | 235 | #define REF_INCOMPLETE 0x40 |
28e6a34e | 236 | |
432ad41e MH |
237 | /* |
238 | * A ref_entry represents either a reference or a "subdirectory" of | |
28e6a34e MH |
239 | * references. |
240 | * | |
241 | * Each directory in the reference namespace is represented by a | |
242 | * ref_entry with (flags & REF_DIR) set and containing a subdir member | |
243 | * that holds the entries in that directory that have been read so | |
244 | * far. If (flags & REF_INCOMPLETE) is set, then the directory and | |
245 | * its subdirectories haven't been read yet. REF_INCOMPLETE is only | |
246 | * used for loose reference directories. | |
247 | * | |
248 | * References are represented by a ref_entry with (flags & REF_DIR) | |
249 | * unset and a value member that describes the reference's value. The | |
250 | * flag member is at the ref_entry level, but it is also needed to | |
251 | * interpret the contents of the value field (in other words, a | |
252 | * ref_value object is not very much use without the enclosing | |
253 | * ref_entry). | |
432ad41e MH |
254 | * |
255 | * Reference names cannot end with slash and directories' names are | |
256 | * always stored with a trailing slash (except for the top-level | |
257 | * directory, which is always denoted by ""). This has two nice | |
258 | * consequences: (1) when the entries in each subdir are sorted | |
259 | * lexicographically by name (as they usually are), the references in | |
260 | * a whole tree can be generated in lexicographic order by traversing | |
261 | * the tree in left-to-right, depth-first order; (2) the names of | |
262 | * references and subdirectories cannot conflict, and therefore the | |
263 | * presence of an empty subdirectory does not block the creation of a | |
264 | * similarly-named reference. (The fact that reference names with the | |
265 | * same leading components can conflict *with each other* is a | |
266 | * separate issue that is regulated by is_refname_available().) | |
267 | * | |
268 | * Please note that the name field contains the fully-qualified | |
269 | * reference (or subdirectory) name. Space could be saved by only | |
270 | * storing the relative names. But that would require the full names | |
271 | * to be generated on the fly when iterating in do_for_each_ref(), and | |
272 | * would break callback functions, who have always been able to assume | |
273 | * that the name strings that they are passed will not be freed during | |
274 | * the iteration. | |
275 | */ | |
bc5fd6d3 MH |
276 | struct ref_entry { |
277 | unsigned char flag; /* ISSYMREF? ISPACKED? */ | |
593f1bb8 | 278 | union { |
432ad41e MH |
279 | struct ref_value value; /* if not (flags&REF_DIR) */ |
280 | struct ref_dir subdir; /* if (flags&REF_DIR) */ | |
593f1bb8 | 281 | } u; |
432ad41e MH |
282 | /* |
283 | * The full name of the reference (e.g., "refs/heads/master") | |
284 | * or the full name of the directory with a trailing slash | |
285 | * (e.g., "refs/heads/"): | |
286 | */ | |
bc5fd6d3 MH |
287 | char name[FLEX_ARRAY]; |
288 | }; | |
e1e22e37 | 289 | |
28e6a34e MH |
290 | static void read_loose_refs(const char *dirname, struct ref_dir *dir); |
291 | ||
d7826d54 MH |
292 | static struct ref_dir *get_ref_dir(struct ref_entry *entry) |
293 | { | |
28e6a34e | 294 | struct ref_dir *dir; |
d7826d54 | 295 | assert(entry->flag & REF_DIR); |
28e6a34e MH |
296 | dir = &entry->u.subdir; |
297 | if (entry->flag & REF_INCOMPLETE) { | |
298 | read_loose_refs(entry->name, dir); | |
299 | entry->flag &= ~REF_INCOMPLETE; | |
300 | } | |
301 | return dir; | |
d7826d54 MH |
302 | } |
303 | ||
d0f810f0 RS |
304 | /* |
305 | * Check if a refname is safe. | |
306 | * For refs that start with "refs/" we consider it safe as long they do | |
307 | * not try to resolve to outside of refs/. | |
308 | * | |
309 | * For all other refs we only consider them safe iff they only contain | |
310 | * upper case characters and '_' (like "HEAD" AND "MERGE_HEAD", and not like | |
311 | * "config"). | |
312 | */ | |
313 | static int refname_is_safe(const char *refname) | |
314 | { | |
315 | if (starts_with(refname, "refs/")) { | |
316 | char *buf; | |
317 | int result; | |
318 | ||
319 | buf = xmalloc(strlen(refname) + 1); | |
320 | /* | |
321 | * Does the refname try to escape refs/? | |
322 | * For example: refs/foo/../bar is safe but refs/foo/../../bar | |
323 | * is not. | |
324 | */ | |
325 | result = !normalize_path_copy(buf, refname + strlen("refs/")); | |
326 | free(buf); | |
327 | return result; | |
328 | } | |
329 | while (*refname) { | |
330 | if (!isupper(*refname) && *refname != '_') | |
331 | return 0; | |
332 | refname++; | |
333 | } | |
334 | return 1; | |
335 | } | |
336 | ||
cddc4258 MH |
337 | static struct ref_entry *create_ref_entry(const char *refname, |
338 | const unsigned char *sha1, int flag, | |
339 | int check_name) | |
e1e22e37 LT |
340 | { |
341 | int len; | |
cddc4258 | 342 | struct ref_entry *ref; |
e1e22e37 | 343 | |
09116a1c | 344 | if (check_name && |
f3cc52d8 | 345 | check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) |
dfefa935 | 346 | die("Reference has invalid format: '%s'", refname); |
d0f810f0 RS |
347 | if (!check_name && !refname_is_safe(refname)) |
348 | die("Reference has invalid name: '%s'", refname); | |
cddc4258 MH |
349 | len = strlen(refname) + 1; |
350 | ref = xmalloc(sizeof(struct ref_entry) + len); | |
593f1bb8 MH |
351 | hashcpy(ref->u.value.sha1, sha1); |
352 | hashclr(ref->u.value.peeled); | |
cddc4258 MH |
353 | memcpy(ref->name, refname, len); |
354 | ref->flag = flag; | |
355 | return ref; | |
356 | } | |
357 | ||
432ad41e MH |
358 | static void clear_ref_dir(struct ref_dir *dir); |
359 | ||
732134ed MH |
360 | static void free_ref_entry(struct ref_entry *entry) |
361 | { | |
27b5587c MH |
362 | if (entry->flag & REF_DIR) { |
363 | /* | |
364 | * Do not use get_ref_dir() here, as that might | |
365 | * trigger the reading of loose refs. | |
366 | */ | |
367 | clear_ref_dir(&entry->u.subdir); | |
368 | } | |
732134ed MH |
369 | free(entry); |
370 | } | |
371 | ||
432ad41e MH |
372 | /* |
373 | * Add a ref_entry to the end of dir (unsorted). Entry is always | |
374 | * stored directly in dir; no recursion into subdirectories is | |
375 | * done. | |
376 | */ | |
377 | static void add_entry_to_dir(struct ref_dir *dir, struct ref_entry *entry) | |
cddc4258 | 378 | { |
432ad41e MH |
379 | ALLOC_GROW(dir->entries, dir->nr + 1, dir->alloc); |
380 | dir->entries[dir->nr++] = entry; | |
654ad400 MH |
381 | /* optimize for the case that entries are added in order */ |
382 | if (dir->nr == 1 || | |
383 | (dir->nr == dir->sorted + 1 && | |
384 | strcmp(dir->entries[dir->nr - 2]->name, | |
385 | dir->entries[dir->nr - 1]->name) < 0)) | |
386 | dir->sorted = dir->nr; | |
c774aab9 JP |
387 | } |
388 | ||
432ad41e MH |
389 | /* |
390 | * Clear and free all entries in dir, recursively. | |
391 | */ | |
d3177275 | 392 | static void clear_ref_dir(struct ref_dir *dir) |
bc5fd6d3 MH |
393 | { |
394 | int i; | |
d3177275 MH |
395 | for (i = 0; i < dir->nr; i++) |
396 | free_ref_entry(dir->entries[i]); | |
397 | free(dir->entries); | |
398 | dir->sorted = dir->nr = dir->alloc = 0; | |
399 | dir->entries = NULL; | |
bc5fd6d3 MH |
400 | } |
401 | ||
432ad41e MH |
402 | /* |
403 | * Create a struct ref_entry object for the specified dirname. | |
404 | * dirname is the name of the directory with a trailing slash (e.g., | |
405 | * "refs/heads/") or "" for the top-level directory. | |
406 | */ | |
f006c42a | 407 | static struct ref_entry *create_dir_entry(struct ref_cache *ref_cache, |
b9146f51 RS |
408 | const char *dirname, size_t len, |
409 | int incomplete) | |
432ad41e MH |
410 | { |
411 | struct ref_entry *direntry; | |
432ad41e | 412 | direntry = xcalloc(1, sizeof(struct ref_entry) + len + 1); |
b9146f51 RS |
413 | memcpy(direntry->name, dirname, len); |
414 | direntry->name[len] = '\0'; | |
f006c42a | 415 | direntry->u.subdir.ref_cache = ref_cache; |
28e6a34e | 416 | direntry->flag = REF_DIR | (incomplete ? REF_INCOMPLETE : 0); |
432ad41e MH |
417 | return direntry; |
418 | } | |
419 | ||
e9c4c111 | 420 | static int ref_entry_cmp(const void *a, const void *b) |
c774aab9 | 421 | { |
e9c4c111 JP |
422 | struct ref_entry *one = *(struct ref_entry **)a; |
423 | struct ref_entry *two = *(struct ref_entry **)b; | |
424 | return strcmp(one->name, two->name); | |
425 | } | |
c774aab9 | 426 | |
d3177275 | 427 | static void sort_ref_dir(struct ref_dir *dir); |
bc5fd6d3 | 428 | |
e1980c9d JH |
429 | struct string_slice { |
430 | size_t len; | |
431 | const char *str; | |
432 | }; | |
433 | ||
434 | static int ref_entry_cmp_sslice(const void *key_, const void *ent_) | |
435 | { | |
c971ddfd RS |
436 | const struct string_slice *key = key_; |
437 | const struct ref_entry *ent = *(const struct ref_entry * const *)ent_; | |
438 | int cmp = strncmp(key->str, ent->name, key->len); | |
e1980c9d JH |
439 | if (cmp) |
440 | return cmp; | |
c971ddfd | 441 | return '\0' - (unsigned char)ent->name[key->len]; |
e1980c9d JH |
442 | } |
443 | ||
432ad41e | 444 | /* |
9fc0a648 MH |
445 | * Return the index of the entry with the given refname from the |
446 | * ref_dir (non-recursively), sorting dir if necessary. Return -1 if | |
447 | * no such entry is found. dir must already be complete. | |
432ad41e | 448 | */ |
9fc0a648 | 449 | static int search_ref_dir(struct ref_dir *dir, const char *refname, size_t len) |
bc5fd6d3 | 450 | { |
e1980c9d JH |
451 | struct ref_entry **r; |
452 | struct string_slice key; | |
bc5fd6d3 | 453 | |
432ad41e | 454 | if (refname == NULL || !dir->nr) |
9fc0a648 | 455 | return -1; |
bc5fd6d3 | 456 | |
d3177275 | 457 | sort_ref_dir(dir); |
e1980c9d JH |
458 | key.len = len; |
459 | key.str = refname; | |
460 | r = bsearch(&key, dir->entries, dir->nr, sizeof(*dir->entries), | |
461 | ref_entry_cmp_sslice); | |
bc5fd6d3 MH |
462 | |
463 | if (r == NULL) | |
9fc0a648 | 464 | return -1; |
bc5fd6d3 | 465 | |
9fc0a648 | 466 | return r - dir->entries; |
bc5fd6d3 MH |
467 | } |
468 | ||
f348ac92 MH |
469 | /* |
470 | * Search for a directory entry directly within dir (without | |
471 | * recursing). Sort dir if necessary. subdirname must be a directory | |
472 | * name (i.e., end in '/'). If mkdir is set, then create the | |
473 | * directory if it is missing; otherwise, return NULL if the desired | |
28e6a34e | 474 | * directory cannot be found. dir must already be complete. |
f348ac92 | 475 | */ |
3f3aa1bc | 476 | static struct ref_dir *search_for_subdir(struct ref_dir *dir, |
dd02e728 RS |
477 | const char *subdirname, size_t len, |
478 | int mkdir) | |
f348ac92 | 479 | { |
9fc0a648 MH |
480 | int entry_index = search_ref_dir(dir, subdirname, len); |
481 | struct ref_entry *entry; | |
482 | if (entry_index == -1) { | |
f348ac92 MH |
483 | if (!mkdir) |
484 | return NULL; | |
28e6a34e MH |
485 | /* |
486 | * Since dir is complete, the absence of a subdir | |
487 | * means that the subdir really doesn't exist; | |
488 | * therefore, create an empty record for it but mark | |
489 | * the record complete. | |
490 | */ | |
b9146f51 | 491 | entry = create_dir_entry(dir->ref_cache, subdirname, len, 0); |
f348ac92 | 492 | add_entry_to_dir(dir, entry); |
9fc0a648 MH |
493 | } else { |
494 | entry = dir->entries[entry_index]; | |
f348ac92 | 495 | } |
3f3aa1bc | 496 | return get_ref_dir(entry); |
f348ac92 MH |
497 | } |
498 | ||
432ad41e MH |
499 | /* |
500 | * If refname is a reference name, find the ref_dir within the dir | |
501 | * tree that should hold refname. If refname is a directory name | |
502 | * (i.e., ends in '/'), then return that ref_dir itself. dir must | |
28e6a34e MH |
503 | * represent the top-level directory and must already be complete. |
504 | * Sort ref_dirs and recurse into subdirectories as necessary. If | |
505 | * mkdir is set, then create any missing directories; otherwise, | |
506 | * return NULL if the desired directory cannot be found. | |
432ad41e MH |
507 | */ |
508 | static struct ref_dir *find_containing_dir(struct ref_dir *dir, | |
509 | const char *refname, int mkdir) | |
510 | { | |
5fa04418 | 511 | const char *slash; |
5fa04418 | 512 | for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) { |
dd02e728 | 513 | size_t dirnamelen = slash - refname + 1; |
3f3aa1bc | 514 | struct ref_dir *subdir; |
dd02e728 | 515 | subdir = search_for_subdir(dir, refname, dirnamelen, mkdir); |
663c1295 JH |
516 | if (!subdir) { |
517 | dir = NULL; | |
f348ac92 | 518 | break; |
432ad41e | 519 | } |
3f3aa1bc | 520 | dir = subdir; |
432ad41e MH |
521 | } |
522 | ||
432ad41e MH |
523 | return dir; |
524 | } | |
525 | ||
526 | /* | |
527 | * Find the value entry with the given name in dir, sorting ref_dirs | |
528 | * and recursing into subdirectories as necessary. If the name is not | |
529 | * found or it corresponds to a directory entry, return NULL. | |
530 | */ | |
531 | static struct ref_entry *find_ref(struct ref_dir *dir, const char *refname) | |
532 | { | |
9fc0a648 | 533 | int entry_index; |
432ad41e MH |
534 | struct ref_entry *entry; |
535 | dir = find_containing_dir(dir, refname, 0); | |
536 | if (!dir) | |
537 | return NULL; | |
9fc0a648 MH |
538 | entry_index = search_ref_dir(dir, refname, strlen(refname)); |
539 | if (entry_index == -1) | |
540 | return NULL; | |
541 | entry = dir->entries[entry_index]; | |
542 | return (entry->flag & REF_DIR) ? NULL : entry; | |
432ad41e MH |
543 | } |
544 | ||
506a760d MH |
545 | /* |
546 | * Remove the entry with the given name from dir, recursing into | |
547 | * subdirectories as necessary. If refname is the name of a directory | |
548 | * (i.e., ends with '/'), then remove the directory and its contents. | |
549 | * If the removal was successful, return the number of entries | |
550 | * remaining in the directory entry that contained the deleted entry. | |
551 | * If the name was not found, return -1. Please note that this | |
552 | * function only deletes the entry from the cache; it does not delete | |
553 | * it from the filesystem or ensure that other cache entries (which | |
554 | * might be symbolic references to the removed entry) are updated. | |
555 | * Nor does it remove any containing dir entries that might be made | |
556 | * empty by the removal. dir must represent the top-level directory | |
557 | * and must already be complete. | |
558 | */ | |
559 | static int remove_entry(struct ref_dir *dir, const char *refname) | |
560 | { | |
561 | int refname_len = strlen(refname); | |
562 | int entry_index; | |
563 | struct ref_entry *entry; | |
564 | int is_dir = refname[refname_len - 1] == '/'; | |
565 | if (is_dir) { | |
566 | /* | |
567 | * refname represents a reference directory. Remove | |
568 | * the trailing slash; otherwise we will get the | |
569 | * directory *representing* refname rather than the | |
570 | * one *containing* it. | |
571 | */ | |
572 | char *dirname = xmemdupz(refname, refname_len - 1); | |
573 | dir = find_containing_dir(dir, dirname, 0); | |
574 | free(dirname); | |
575 | } else { | |
576 | dir = find_containing_dir(dir, refname, 0); | |
577 | } | |
578 | if (!dir) | |
579 | return -1; | |
580 | entry_index = search_ref_dir(dir, refname, refname_len); | |
581 | if (entry_index == -1) | |
582 | return -1; | |
583 | entry = dir->entries[entry_index]; | |
584 | ||
585 | memmove(&dir->entries[entry_index], | |
586 | &dir->entries[entry_index + 1], | |
587 | (dir->nr - entry_index - 1) * sizeof(*dir->entries) | |
588 | ); | |
589 | dir->nr--; | |
590 | if (dir->sorted > entry_index) | |
591 | dir->sorted--; | |
592 | free_ref_entry(entry); | |
593 | return dir->nr; | |
432ad41e MH |
594 | } |
595 | ||
596 | /* | |
597 | * Add a ref_entry to the ref_dir (unsorted), recursing into | |
598 | * subdirectories as necessary. dir must represent the top-level | |
599 | * directory. Return 0 on success. | |
600 | */ | |
601 | static int add_ref(struct ref_dir *dir, struct ref_entry *ref) | |
602 | { | |
603 | dir = find_containing_dir(dir, ref->name, 1); | |
604 | if (!dir) | |
605 | return -1; | |
606 | add_entry_to_dir(dir, ref); | |
607 | return 0; | |
608 | } | |
609 | ||
202a56a9 MH |
610 | /* |
611 | * Emit a warning and return true iff ref1 and ref2 have the same name | |
612 | * and the same sha1. Die if they have the same name but different | |
613 | * sha1s. | |
614 | */ | |
615 | static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2) | |
616 | { | |
432ad41e | 617 | if (strcmp(ref1->name, ref2->name)) |
202a56a9 | 618 | return 0; |
432ad41e MH |
619 | |
620 | /* Duplicate name; make sure that they don't conflict: */ | |
621 | ||
622 | if ((ref1->flag & REF_DIR) || (ref2->flag & REF_DIR)) | |
623 | /* This is impossible by construction */ | |
624 | die("Reference directory conflict: %s", ref1->name); | |
625 | ||
626 | if (hashcmp(ref1->u.value.sha1, ref2->u.value.sha1)) | |
627 | die("Duplicated ref, and SHA1s don't match: %s", ref1->name); | |
628 | ||
629 | warning("Duplicated ref: %s", ref1->name); | |
630 | return 1; | |
202a56a9 MH |
631 | } |
632 | ||
e6ed3ca6 | 633 | /* |
432ad41e MH |
634 | * Sort the entries in dir non-recursively (if they are not already |
635 | * sorted) and remove any duplicate entries. | |
e6ed3ca6 | 636 | */ |
d3177275 | 637 | static void sort_ref_dir(struct ref_dir *dir) |
e9c4c111 | 638 | { |
202a56a9 | 639 | int i, j; |
81a79d8e | 640 | struct ref_entry *last = NULL; |
c774aab9 | 641 | |
e6ed3ca6 MH |
642 | /* |
643 | * This check also prevents passing a zero-length array to qsort(), | |
644 | * which is a problem on some platforms. | |
645 | */ | |
d3177275 | 646 | if (dir->sorted == dir->nr) |
e9c4c111 | 647 | return; |
c774aab9 | 648 | |
d3177275 | 649 | qsort(dir->entries, dir->nr, sizeof(*dir->entries), ref_entry_cmp); |
c774aab9 | 650 | |
81a79d8e MH |
651 | /* Remove any duplicates: */ |
652 | for (i = 0, j = 0; j < dir->nr; j++) { | |
653 | struct ref_entry *entry = dir->entries[j]; | |
654 | if (last && is_dup_ref(last, entry)) | |
655 | free_ref_entry(entry); | |
656 | else | |
657 | last = dir->entries[i++] = entry; | |
e9c4c111 | 658 | } |
81a79d8e | 659 | dir->sorted = dir->nr = i; |
e9c4c111 | 660 | } |
c774aab9 | 661 | |
fcce1703 MH |
662 | /* Include broken references in a do_for_each_ref*() iteration: */ |
663 | #define DO_FOR_EACH_INCLUDE_BROKEN 0x01 | |
c774aab9 | 664 | |
662428f4 MH |
665 | /* |
666 | * Return true iff the reference described by entry can be resolved to | |
667 | * an object in the database. Emit a warning if the referred-to | |
668 | * object does not exist. | |
669 | */ | |
670 | static int ref_resolves_to_object(struct ref_entry *entry) | |
671 | { | |
672 | if (entry->flag & REF_ISBROKEN) | |
673 | return 0; | |
674 | if (!has_sha1_file(entry->u.value.sha1)) { | |
675 | error("%s does not point to a valid object!", entry->name); | |
676 | return 0; | |
677 | } | |
678 | return 1; | |
679 | } | |
c774aab9 | 680 | |
7d76fdc8 MH |
681 | /* |
682 | * current_ref is a performance hack: when iterating over references | |
683 | * using the for_each_ref*() functions, current_ref is set to the | |
684 | * current reference's entry before calling the callback function. If | |
685 | * the callback function calls peel_ref(), then peel_ref() first | |
686 | * checks whether the reference to be peeled is the current reference | |
687 | * (it usually is) and if so, returns that reference's peeled version | |
688 | * if it is available. This avoids a refname lookup in a common case. | |
689 | */ | |
bc5fd6d3 | 690 | static struct ref_entry *current_ref; |
c774aab9 | 691 | |
624cac35 MH |
692 | typedef int each_ref_entry_fn(struct ref_entry *entry, void *cb_data); |
693 | ||
694 | struct ref_entry_cb { | |
695 | const char *base; | |
696 | int trim; | |
697 | int flags; | |
698 | each_ref_fn *fn; | |
699 | void *cb_data; | |
700 | }; | |
701 | ||
fcce1703 | 702 | /* |
624cac35 MH |
703 | * Handle one reference in a do_for_each_ref*()-style iteration, |
704 | * calling an each_ref_fn for each entry. | |
fcce1703 | 705 | */ |
624cac35 | 706 | static int do_one_ref(struct ref_entry *entry, void *cb_data) |
bc5fd6d3 | 707 | { |
624cac35 | 708 | struct ref_entry_cb *data = cb_data; |
d0cf51e9 | 709 | struct ref_entry *old_current_ref; |
429213e4 | 710 | int retval; |
d0cf51e9 | 711 | |
59556548 | 712 | if (!starts_with(entry->name, data->base)) |
bc5fd6d3 | 713 | return 0; |
c774aab9 | 714 | |
624cac35 | 715 | if (!(data->flags & DO_FOR_EACH_INCLUDE_BROKEN) && |
662428f4 | 716 | !ref_resolves_to_object(entry)) |
bc5fd6d3 | 717 | return 0; |
c774aab9 | 718 | |
d0cf51e9 MH |
719 | /* Store the old value, in case this is a recursive call: */ |
720 | old_current_ref = current_ref; | |
bc5fd6d3 | 721 | current_ref = entry; |
624cac35 MH |
722 | retval = data->fn(entry->name + data->trim, entry->u.value.sha1, |
723 | entry->flag, data->cb_data); | |
d0cf51e9 | 724 | current_ref = old_current_ref; |
429213e4 | 725 | return retval; |
bc5fd6d3 | 726 | } |
c774aab9 | 727 | |
c36b5bc2 | 728 | /* |
d3177275 | 729 | * Call fn for each reference in dir that has index in the range |
432ad41e MH |
730 | * offset <= index < dir->nr. Recurse into subdirectories that are in |
731 | * that index range, sorting them before iterating. This function | |
624cac35 MH |
732 | * does not sort dir itself; it should be sorted beforehand. fn is |
733 | * called for all references, including broken ones. | |
c36b5bc2 | 734 | */ |
624cac35 MH |
735 | static int do_for_each_entry_in_dir(struct ref_dir *dir, int offset, |
736 | each_ref_entry_fn fn, void *cb_data) | |
c36b5bc2 MH |
737 | { |
738 | int i; | |
d3177275 MH |
739 | assert(dir->sorted == dir->nr); |
740 | for (i = offset; i < dir->nr; i++) { | |
432ad41e MH |
741 | struct ref_entry *entry = dir->entries[i]; |
742 | int retval; | |
743 | if (entry->flag & REF_DIR) { | |
d7826d54 MH |
744 | struct ref_dir *subdir = get_ref_dir(entry); |
745 | sort_ref_dir(subdir); | |
624cac35 | 746 | retval = do_for_each_entry_in_dir(subdir, 0, fn, cb_data); |
432ad41e | 747 | } else { |
624cac35 | 748 | retval = fn(entry, cb_data); |
432ad41e | 749 | } |
c36b5bc2 MH |
750 | if (retval) |
751 | return retval; | |
752 | } | |
753 | return 0; | |
754 | } | |
755 | ||
b3fd060f | 756 | /* |
d3177275 | 757 | * Call fn for each reference in the union of dir1 and dir2, in order |
432ad41e MH |
758 | * by refname. Recurse into subdirectories. If a value entry appears |
759 | * in both dir1 and dir2, then only process the version that is in | |
760 | * dir2. The input dirs must already be sorted, but subdirs will be | |
624cac35 MH |
761 | * sorted as needed. fn is called for all references, including |
762 | * broken ones. | |
b3fd060f | 763 | */ |
624cac35 MH |
764 | static int do_for_each_entry_in_dirs(struct ref_dir *dir1, |
765 | struct ref_dir *dir2, | |
766 | each_ref_entry_fn fn, void *cb_data) | |
b3fd060f MH |
767 | { |
768 | int retval; | |
769 | int i1 = 0, i2 = 0; | |
770 | ||
d3177275 MH |
771 | assert(dir1->sorted == dir1->nr); |
772 | assert(dir2->sorted == dir2->nr); | |
432ad41e MH |
773 | while (1) { |
774 | struct ref_entry *e1, *e2; | |
775 | int cmp; | |
776 | if (i1 == dir1->nr) { | |
624cac35 | 777 | return do_for_each_entry_in_dir(dir2, i2, fn, cb_data); |
432ad41e MH |
778 | } |
779 | if (i2 == dir2->nr) { | |
624cac35 | 780 | return do_for_each_entry_in_dir(dir1, i1, fn, cb_data); |
432ad41e MH |
781 | } |
782 | e1 = dir1->entries[i1]; | |
783 | e2 = dir2->entries[i2]; | |
784 | cmp = strcmp(e1->name, e2->name); | |
785 | if (cmp == 0) { | |
786 | if ((e1->flag & REF_DIR) && (e2->flag & REF_DIR)) { | |
787 | /* Both are directories; descend them in parallel. */ | |
d7826d54 MH |
788 | struct ref_dir *subdir1 = get_ref_dir(e1); |
789 | struct ref_dir *subdir2 = get_ref_dir(e2); | |
790 | sort_ref_dir(subdir1); | |
791 | sort_ref_dir(subdir2); | |
624cac35 MH |
792 | retval = do_for_each_entry_in_dirs( |
793 | subdir1, subdir2, fn, cb_data); | |
432ad41e MH |
794 | i1++; |
795 | i2++; | |
796 | } else if (!(e1->flag & REF_DIR) && !(e2->flag & REF_DIR)) { | |
797 | /* Both are references; ignore the one from dir1. */ | |
624cac35 | 798 | retval = fn(e2, cb_data); |
432ad41e MH |
799 | i1++; |
800 | i2++; | |
801 | } else { | |
802 | die("conflict between reference and directory: %s", | |
803 | e1->name); | |
804 | } | |
b3fd060f | 805 | } else { |
432ad41e MH |
806 | struct ref_entry *e; |
807 | if (cmp < 0) { | |
808 | e = e1; | |
b3fd060f | 809 | i1++; |
432ad41e MH |
810 | } else { |
811 | e = e2; | |
812 | i2++; | |
813 | } | |
814 | if (e->flag & REF_DIR) { | |
d7826d54 MH |
815 | struct ref_dir *subdir = get_ref_dir(e); |
816 | sort_ref_dir(subdir); | |
624cac35 MH |
817 | retval = do_for_each_entry_in_dir( |
818 | subdir, 0, fn, cb_data); | |
432ad41e | 819 | } else { |
624cac35 | 820 | retval = fn(e, cb_data); |
b3fd060f MH |
821 | } |
822 | } | |
823 | if (retval) | |
824 | return retval; | |
825 | } | |
b3fd060f MH |
826 | } |
827 | ||
98eeb09e JK |
828 | /* |
829 | * Load all of the refs from the dir into our in-memory cache. The hard work | |
830 | * of loading loose refs is done by get_ref_dir(), so we just need to recurse | |
831 | * through all of the sub-directories. We do not even need to care about | |
832 | * sorting, as traversal order does not matter to us. | |
833 | */ | |
834 | static void prime_ref_dir(struct ref_dir *dir) | |
835 | { | |
836 | int i; | |
837 | for (i = 0; i < dir->nr; i++) { | |
838 | struct ref_entry *entry = dir->entries[i]; | |
839 | if (entry->flag & REF_DIR) | |
840 | prime_ref_dir(get_ref_dir(entry)); | |
841 | } | |
842 | } | |
cbe73331 | 843 | |
cbe73331 | 844 | struct nonmatching_ref_data { |
5fe7d825 | 845 | const struct string_list *skip; |
521331cc | 846 | const char *conflicting_refname; |
5a4d4947 MH |
847 | }; |
848 | ||
cbe73331 | 849 | static int nonmatching_ref_fn(struct ref_entry *entry, void *vdata) |
5a4d4947 | 850 | { |
cbe73331 JK |
851 | struct nonmatching_ref_data *data = vdata; |
852 | ||
8bfac19a | 853 | if (data->skip && string_list_has_string(data->skip, entry->name)) |
5a4d4947 | 854 | return 0; |
cbe73331 | 855 | |
521331cc | 856 | data->conflicting_refname = entry->name; |
cbe73331 JK |
857 | return 1; |
858 | } | |
859 | ||
bc5fd6d3 MH |
860 | /* |
861 | * Return true iff a reference named refname could be created without | |
624cac35 | 862 | * conflicting with the name of an existing reference in dir. If |
5fe7d825 RS |
863 | * skip is non-NULL, ignore potential conflicts with refs in skip |
864 | * (e.g., because they are scheduled for deletion in the same | |
bc5fd6d3 | 865 | * operation). |
cbe73331 JK |
866 | * |
867 | * Two reference names conflict if one of them exactly matches the | |
49e81876 MH |
868 | * leading components of the other; e.g., "refs/foo/bar" conflicts |
869 | * with both "refs/foo" and with "refs/foo/bar/baz" but not with | |
870 | * "refs/foo/bar" or "refs/foo/barbados". | |
5fe7d825 RS |
871 | * |
872 | * skip must be sorted. | |
bc5fd6d3 | 873 | */ |
5fe7d825 RS |
874 | static int is_refname_available(const char *refname, |
875 | const struct string_list *skip, | |
d3177275 | 876 | struct ref_dir *dir) |
bc5fd6d3 | 877 | { |
cbe73331 | 878 | const char *slash; |
cbe73331 | 879 | int pos; |
6075f307 | 880 | struct strbuf dirname = STRBUF_INIT; |
61da5969 | 881 | int ret = 0; |
5a4d4947 | 882 | |
49e81876 MH |
883 | /* |
884 | * For the sake of comments in this function, suppose that | |
885 | * refname is "refs/foo/bar". | |
886 | */ | |
887 | ||
61da5969 | 888 | strbuf_grow(&dirname, strlen(refname) + 1); |
cbe73331 | 889 | for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) { |
61da5969 MH |
890 | /* Expand dirname to the new prefix, not including the trailing slash: */ |
891 | strbuf_add(&dirname, refname + dirname.len, slash - refname - dirname.len); | |
892 | ||
cbe73331 | 893 | /* |
49e81876 MH |
894 | * We are still at a leading dir of the refname (e.g., |
895 | * "refs/foo"; if there is a reference with that name, | |
896 | * it is a conflict, *unless* it is in skip. | |
cbe73331 | 897 | */ |
61da5969 | 898 | pos = search_ref_dir(dir, dirname.buf, dirname.len); |
cbe73331 | 899 | if (pos >= 0) { |
49e81876 MH |
900 | /* |
901 | * We found a reference whose name is a proper | |
902 | * prefix of refname; e.g., "refs/foo". | |
903 | */ | |
61da5969 | 904 | if (skip && string_list_has_string(skip, dirname.buf)) { |
49e81876 MH |
905 | /* |
906 | * The reference we just found, e.g., | |
907 | * "refs/foo", is also in skip, so it | |
908 | * is not considered a conflict. | |
909 | * Moreover, the fact that "refs/foo" | |
910 | * exists means that there cannot be | |
911 | * any references anywhere under the | |
912 | * "refs/foo/" namespace (because they | |
913 | * would have conflicted with | |
914 | * "refs/foo"). So we can stop looking | |
915 | * now and return true. | |
916 | */ | |
61da5969 MH |
917 | ret = 1; |
918 | goto cleanup; | |
49e81876 | 919 | } |
61da5969 MH |
920 | error("'%s' exists; cannot create '%s'", dirname.buf, refname); |
921 | goto cleanup; | |
cbe73331 JK |
922 | } |
923 | ||
924 | ||
925 | /* | |
926 | * Otherwise, we can try to continue our search with | |
49e81876 MH |
927 | * the next component. So try to look up the |
928 | * directory, e.g., "refs/foo/". | |
cbe73331 | 929 | */ |
61da5969 MH |
930 | strbuf_addch(&dirname, '/'); |
931 | pos = search_ref_dir(dir, dirname.buf, dirname.len); | |
49e81876 MH |
932 | if (pos < 0) { |
933 | /* | |
934 | * There was no directory "refs/foo/", so | |
935 | * there is nothing under this whole prefix, | |
936 | * and we are OK. | |
937 | */ | |
61da5969 MH |
938 | ret = 1; |
939 | goto cleanup; | |
49e81876 | 940 | } |
cbe73331 JK |
941 | |
942 | dir = get_ref_dir(dir->entries[pos]); | |
943 | } | |
944 | ||
945 | /* | |
49e81876 MH |
946 | * We are at the leaf of our refname (e.g., "refs/foo/bar"). |
947 | * There is no point in searching for a reference with that | |
948 | * name, because a refname isn't considered to conflict with | |
949 | * itself. But we still need to check for references whose | |
950 | * names are in the "refs/foo/bar/" namespace, because they | |
951 | * *do* conflict. | |
cbe73331 | 952 | */ |
61da5969 | 953 | strbuf_addstr(&dirname, refname + dirname.len); |
6075f307 MH |
954 | strbuf_addch(&dirname, '/'); |
955 | pos = search_ref_dir(dir, dirname.buf, dirname.len); | |
cbe73331 JK |
956 | |
957 | if (pos >= 0) { | |
958 | /* | |
49e81876 MH |
959 | * We found a directory named "$refname/" (e.g., |
960 | * "refs/foo/bar/"). It is a problem iff it contains | |
961 | * any ref that is not in "skip". | |
cbe73331 | 962 | */ |
cbe73331 | 963 | struct nonmatching_ref_data data; |
9ef6eaa2 | 964 | struct ref_entry *entry = dir->entries[pos]; |
cbe73331 | 965 | |
9ef6eaa2 | 966 | dir = get_ref_dir(entry); |
5fe7d825 | 967 | data.skip = skip; |
cbe73331 | 968 | sort_ref_dir(dir); |
61da5969 MH |
969 | if (!do_for_each_entry_in_dir(dir, 0, nonmatching_ref_fn, &data)) { |
970 | ret = 1; | |
971 | goto cleanup; | |
972 | } | |
cbe73331 | 973 | |
521331cc MH |
974 | error("'%s' exists; cannot create '%s'", |
975 | data.conflicting_refname, refname); | |
61da5969 | 976 | goto cleanup; |
bc5fd6d3 | 977 | } |
cbe73331 | 978 | |
61da5969 MH |
979 | ret = 1; |
980 | ||
981 | cleanup: | |
982 | strbuf_release(&dirname); | |
983 | return ret; | |
e1e22e37 LT |
984 | } |
985 | ||
2fff7812 MH |
986 | struct packed_ref_cache { |
987 | struct ref_entry *root; | |
9f69d297 | 988 | |
5f5e2a88 MH |
989 | /* |
990 | * Count of references to the data structure in this instance, | |
991 | * including the pointer from ref_cache::packed if any. The | |
992 | * data will not be freed as long as the reference count is | |
993 | * nonzero. | |
994 | */ | |
995 | unsigned int referrers; | |
996 | ||
9f69d297 MH |
997 | /* |
998 | * Iff the packed-refs file associated with this instance is | |
999 | * currently locked for writing, this points at the associated | |
4f6b83e3 MH |
1000 | * lock (which is owned by somebody else). The referrer count |
1001 | * is also incremented when the file is locked and decremented | |
1002 | * when it is unlocked. | |
9f69d297 MH |
1003 | */ |
1004 | struct lock_file *lock; | |
ca919930 JK |
1005 | |
1006 | /* The metadata from when this packed-refs cache was read */ | |
1007 | struct stat_validity validity; | |
2fff7812 MH |
1008 | }; |
1009 | ||
5e290ff7 JH |
1010 | /* |
1011 | * Future: need to be in "struct repository" | |
1012 | * when doing a full libification. | |
1013 | */ | |
79c7ca54 MH |
1014 | static struct ref_cache { |
1015 | struct ref_cache *next; | |
d12229f5 | 1016 | struct ref_entry *loose; |
2fff7812 | 1017 | struct packed_ref_cache *packed; |
9da31cb0 MH |
1018 | /* |
1019 | * The submodule name, or "" for the main repo. We allocate | |
1020 | * length 1 rather than FLEX_ARRAY so that the main ref_cache | |
1021 | * is initialized correctly. | |
1022 | */ | |
1023 | char name[1]; | |
1024 | } ref_cache, *submodule_ref_caches; | |
0e88c130 | 1025 | |
9f69d297 MH |
1026 | /* Lock used for the main packed-refs file: */ |
1027 | static struct lock_file packlock; | |
1028 | ||
5f5e2a88 MH |
1029 | /* |
1030 | * Increment the reference count of *packed_refs. | |
1031 | */ | |
1032 | static void acquire_packed_ref_cache(struct packed_ref_cache *packed_refs) | |
1033 | { | |
1034 | packed_refs->referrers++; | |
1035 | } | |
1036 | ||
1037 | /* | |
1038 | * Decrease the reference count of *packed_refs. If it goes to zero, | |
1039 | * free *packed_refs and return true; otherwise return false. | |
1040 | */ | |
1041 | static int release_packed_ref_cache(struct packed_ref_cache *packed_refs) | |
1042 | { | |
1043 | if (!--packed_refs->referrers) { | |
1044 | free_ref_entry(packed_refs->root); | |
ca919930 | 1045 | stat_validity_clear(&packed_refs->validity); |
5f5e2a88 MH |
1046 | free(packed_refs); |
1047 | return 1; | |
1048 | } else { | |
1049 | return 0; | |
1050 | } | |
1051 | } | |
1052 | ||
760c4512 | 1053 | static void clear_packed_ref_cache(struct ref_cache *refs) |
e1e22e37 | 1054 | { |
d12229f5 | 1055 | if (refs->packed) { |
5f5e2a88 MH |
1056 | struct packed_ref_cache *packed_refs = refs->packed; |
1057 | ||
1058 | if (packed_refs->lock) | |
9f69d297 | 1059 | die("internal error: packed-ref cache cleared while locked"); |
d12229f5 | 1060 | refs->packed = NULL; |
5f5e2a88 | 1061 | release_packed_ref_cache(packed_refs); |
d12229f5 | 1062 | } |
5e290ff7 | 1063 | } |
e1e22e37 | 1064 | |
760c4512 MH |
1065 | static void clear_loose_ref_cache(struct ref_cache *refs) |
1066 | { | |
d12229f5 MH |
1067 | if (refs->loose) { |
1068 | free_ref_entry(refs->loose); | |
1069 | refs->loose = NULL; | |
1070 | } | |
760c4512 MH |
1071 | } |
1072 | ||
79c7ca54 | 1073 | static struct ref_cache *create_ref_cache(const char *submodule) |
e5dbf605 | 1074 | { |
ce40979c | 1075 | int len; |
79c7ca54 | 1076 | struct ref_cache *refs; |
ce40979c MH |
1077 | if (!submodule) |
1078 | submodule = ""; | |
1079 | len = strlen(submodule) + 1; | |
79c7ca54 | 1080 | refs = xcalloc(1, sizeof(struct ref_cache) + len); |
ce40979c | 1081 | memcpy(refs->name, submodule, len); |
e5dbf605 MH |
1082 | return refs; |
1083 | } | |
1084 | ||
4349a668 | 1085 | /* |
79c7ca54 | 1086 | * Return a pointer to a ref_cache for the specified submodule. For |
4349a668 MH |
1087 | * the main repository, use submodule==NULL. The returned structure |
1088 | * will be allocated and initialized but not necessarily populated; it | |
1089 | * should not be freed. | |
1090 | */ | |
79c7ca54 | 1091 | static struct ref_cache *get_ref_cache(const char *submodule) |
4349a668 | 1092 | { |
9da31cb0 MH |
1093 | struct ref_cache *refs; |
1094 | ||
1095 | if (!submodule || !*submodule) | |
1096 | return &ref_cache; | |
1097 | ||
1098 | for (refs = submodule_ref_caches; refs; refs = refs->next) | |
0e88c130 MH |
1099 | if (!strcmp(submodule, refs->name)) |
1100 | return refs; | |
0e88c130 | 1101 | |
79c7ca54 | 1102 | refs = create_ref_cache(submodule); |
9da31cb0 MH |
1103 | refs->next = submodule_ref_caches; |
1104 | submodule_ref_caches = refs; | |
0e88c130 | 1105 | return refs; |
4349a668 MH |
1106 | } |
1107 | ||
3feb4f0c MH |
1108 | /* The length of a peeled reference line in packed-refs, including EOL: */ |
1109 | #define PEELED_LINE_LENGTH 42 | |
1110 | ||
694b7a19 MH |
1111 | /* |
1112 | * The packed-refs header line that we write out. Perhaps other | |
1113 | * traits will be added later. The trailing space is required. | |
1114 | */ | |
1115 | static const char PACKED_REFS_HEADER[] = | |
1116 | "# pack-refs with: peeled fully-peeled \n"; | |
1117 | ||
bc5fd6d3 MH |
1118 | /* |
1119 | * Parse one line from a packed-refs file. Write the SHA1 to sha1. | |
1120 | * Return a pointer to the refname within the line (null-terminated), | |
1121 | * or NULL if there was a problem. | |
1122 | */ | |
6a49870a | 1123 | static const char *parse_ref_line(struct strbuf *line, unsigned char *sha1) |
bc5fd6d3 | 1124 | { |
6a49870a JK |
1125 | const char *ref; |
1126 | ||
bc5fd6d3 MH |
1127 | /* |
1128 | * 42: the answer to everything. | |
1129 | * | |
1130 | * In this case, it happens to be the answer to | |
1131 | * 40 (length of sha1 hex representation) | |
1132 | * +1 (space in between hex and name) | |
1133 | * +1 (newline at the end of the line) | |
1134 | */ | |
6a49870a | 1135 | if (line->len <= 42) |
bc5fd6d3 | 1136 | return NULL; |
6a49870a JK |
1137 | |
1138 | if (get_sha1_hex(line->buf, sha1) < 0) | |
bc5fd6d3 | 1139 | return NULL; |
6a49870a | 1140 | if (!isspace(line->buf[40])) |
bc5fd6d3 | 1141 | return NULL; |
6a49870a JK |
1142 | |
1143 | ref = line->buf + 41; | |
1144 | if (isspace(*ref)) | |
bc5fd6d3 | 1145 | return NULL; |
6a49870a JK |
1146 | |
1147 | if (line->buf[line->len - 1] != '\n') | |
bc5fd6d3 | 1148 | return NULL; |
6a49870a | 1149 | line->buf[--line->len] = 0; |
bc5fd6d3 | 1150 | |
6a49870a | 1151 | return ref; |
bc5fd6d3 MH |
1152 | } |
1153 | ||
c29c46fa MH |
1154 | /* |
1155 | * Read f, which is a packed-refs file, into dir. | |
1156 | * | |
1157 | * A comment line of the form "# pack-refs with: " may contain zero or | |
1158 | * more traits. We interpret the traits as follows: | |
1159 | * | |
1160 | * No traits: | |
1161 | * | |
1162 | * Probably no references are peeled. But if the file contains a | |
1163 | * peeled value for a reference, we will use it. | |
1164 | * | |
1165 | * peeled: | |
1166 | * | |
1167 | * References under "refs/tags/", if they *can* be peeled, *are* | |
1168 | * peeled in this file. References outside of "refs/tags/" are | |
1169 | * probably not peeled even if they could have been, but if we find | |
1170 | * a peeled value for such a reference we will use it. | |
1171 | * | |
1172 | * fully-peeled: | |
1173 | * | |
1174 | * All references in the file that can be peeled are peeled. | |
1175 | * Inversely (and this is more important), any references in the | |
1176 | * file for which no peeled value is recorded is not peelable. This | |
1177 | * trait should typically be written alongside "peeled" for | |
1178 | * compatibility with older clients, but we do not require it | |
1179 | * (i.e., "peeled" is a no-op if "fully-peeled" is set). | |
1180 | */ | |
d3177275 | 1181 | static void read_packed_refs(FILE *f, struct ref_dir *dir) |
f4204ab9 | 1182 | { |
e9c4c111 | 1183 | struct ref_entry *last = NULL; |
10c497aa | 1184 | struct strbuf line = STRBUF_INIT; |
c29c46fa | 1185 | enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE; |
f4204ab9 | 1186 | |
10c497aa | 1187 | while (strbuf_getwholeline(&line, f, '\n') != EOF) { |
f4204ab9 | 1188 | unsigned char sha1[20]; |
dfefa935 | 1189 | const char *refname; |
ea417833 | 1190 | const char *traits; |
f4204ab9 | 1191 | |
ea417833 | 1192 | if (skip_prefix(line.buf, "# pack-refs with:", &traits)) { |
c29c46fa MH |
1193 | if (strstr(traits, " fully-peeled ")) |
1194 | peeled = PEELED_FULLY; | |
1195 | else if (strstr(traits, " peeled ")) | |
1196 | peeled = PEELED_TAGS; | |
f4204ab9 JH |
1197 | /* perhaps other traits later as well */ |
1198 | continue; | |
1199 | } | |
1200 | ||
6a49870a | 1201 | refname = parse_ref_line(&line, sha1); |
dfefa935 | 1202 | if (refname) { |
d0f810f0 RS |
1203 | int flag = REF_ISPACKED; |
1204 | ||
1205 | if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) { | |
1206 | hashclr(sha1); | |
1207 | flag |= REF_BAD_NAME | REF_ISBROKEN; | |
1208 | } | |
1209 | last = create_ref_entry(refname, sha1, flag, 0); | |
c29c46fa | 1210 | if (peeled == PEELED_FULLY || |
59556548 | 1211 | (peeled == PEELED_TAGS && starts_with(refname, "refs/tags/"))) |
c29c46fa | 1212 | last->flag |= REF_KNOWS_PEELED; |
d3177275 | 1213 | add_ref(dir, last); |
f4204ab9 JH |
1214 | continue; |
1215 | } | |
1216 | if (last && | |
10c497aa JK |
1217 | line.buf[0] == '^' && |
1218 | line.len == PEELED_LINE_LENGTH && | |
1219 | line.buf[PEELED_LINE_LENGTH - 1] == '\n' && | |
1220 | !get_sha1_hex(line.buf + 1, sha1)) { | |
593f1bb8 | 1221 | hashcpy(last->u.value.peeled, sha1); |
c29c46fa MH |
1222 | /* |
1223 | * Regardless of what the file header said, | |
1224 | * we definitely know the value of *this* | |
1225 | * reference: | |
1226 | */ | |
1227 | last->flag |= REF_KNOWS_PEELED; | |
1228 | } | |
f4204ab9 | 1229 | } |
10c497aa JK |
1230 | |
1231 | strbuf_release(&line); | |
f4204ab9 JH |
1232 | } |
1233 | ||
2fff7812 MH |
1234 | /* |
1235 | * Get the packed_ref_cache for the specified ref_cache, creating it | |
1236 | * if necessary. | |
1237 | */ | |
1238 | static struct packed_ref_cache *get_packed_ref_cache(struct ref_cache *refs) | |
5e290ff7 | 1239 | { |
ca919930 JK |
1240 | const char *packed_refs_file; |
1241 | ||
1242 | if (*refs->name) | |
1243 | packed_refs_file = git_path_submodule(refs->name, "packed-refs"); | |
1244 | else | |
1245 | packed_refs_file = git_path("packed-refs"); | |
1246 | ||
1247 | if (refs->packed && | |
1248 | !stat_validity_check(&refs->packed->validity, packed_refs_file)) | |
1249 | clear_packed_ref_cache(refs); | |
1250 | ||
d12229f5 | 1251 | if (!refs->packed) { |
4349a668 | 1252 | FILE *f; |
0bad611b | 1253 | |
2fff7812 | 1254 | refs->packed = xcalloc(1, sizeof(*refs->packed)); |
5f5e2a88 | 1255 | acquire_packed_ref_cache(refs->packed); |
2fff7812 | 1256 | refs->packed->root = create_dir_entry(refs, "", 0, 0); |
4349a668 | 1257 | f = fopen(packed_refs_file, "r"); |
e1e22e37 | 1258 | if (f) { |
ca919930 | 1259 | stat_validity_update(&refs->packed->validity, fileno(f)); |
2fff7812 | 1260 | read_packed_refs(f, get_ref_dir(refs->packed->root)); |
e1e22e37 | 1261 | fclose(f); |
e1e22e37 | 1262 | } |
e1e22e37 | 1263 | } |
2fff7812 MH |
1264 | return refs->packed; |
1265 | } | |
1266 | ||
1267 | static struct ref_dir *get_packed_ref_dir(struct packed_ref_cache *packed_ref_cache) | |
1268 | { | |
1269 | return get_ref_dir(packed_ref_cache->root); | |
1270 | } | |
1271 | ||
1272 | static struct ref_dir *get_packed_refs(struct ref_cache *refs) | |
1273 | { | |
1274 | return get_packed_ref_dir(get_packed_ref_cache(refs)); | |
e1e22e37 LT |
1275 | } |
1276 | ||
30249ee6 MH |
1277 | void add_packed_ref(const char *refname, const unsigned char *sha1) |
1278 | { | |
9f69d297 MH |
1279 | struct packed_ref_cache *packed_ref_cache = |
1280 | get_packed_ref_cache(&ref_cache); | |
1281 | ||
1282 | if (!packed_ref_cache->lock) | |
1283 | die("internal error: packed refs not locked"); | |
1284 | add_ref(get_packed_ref_dir(packed_ref_cache), | |
9da31cb0 | 1285 | create_ref_entry(refname, sha1, REF_ISPACKED, 1)); |
30249ee6 MH |
1286 | } |
1287 | ||
abc39098 | 1288 | /* |
28e6a34e MH |
1289 | * Read the loose references from the namespace dirname into dir |
1290 | * (without recursing). dirname must end with '/'. dir must be the | |
1291 | * directory entry corresponding to dirname. | |
abc39098 | 1292 | */ |
423a1afc | 1293 | static void read_loose_refs(const char *dirname, struct ref_dir *dir) |
e1e22e37 | 1294 | { |
423a1afc | 1295 | struct ref_cache *refs = dir->ref_cache; |
d3177275 | 1296 | DIR *d; |
0bad611b | 1297 | const char *path; |
d5fdae67 | 1298 | struct dirent *de; |
abc39098 | 1299 | int dirnamelen = strlen(dirname); |
72b64b44 | 1300 | struct strbuf refname; |
0bad611b | 1301 | |
3b124823 | 1302 | if (*refs->name) |
66a3d20b | 1303 | path = git_path_submodule(refs->name, "%s", dirname); |
0bad611b | 1304 | else |
66a3d20b | 1305 | path = git_path("%s", dirname); |
0bad611b | 1306 | |
d3177275 | 1307 | d = opendir(path); |
d5fdae67 MH |
1308 | if (!d) |
1309 | return; | |
1310 | ||
66a3d20b MH |
1311 | strbuf_init(&refname, dirnamelen + 257); |
1312 | strbuf_add(&refname, dirname, dirnamelen); | |
d5fdae67 MH |
1313 | |
1314 | while ((de = readdir(d)) != NULL) { | |
1315 | unsigned char sha1[20]; | |
1316 | struct stat st; | |
1317 | int flag; | |
d5fdae67 MH |
1318 | const char *refdir; |
1319 | ||
1320 | if (de->d_name[0] == '.') | |
1321 | continue; | |
2975c770 | 1322 | if (ends_with(de->d_name, ".lock")) |
d5fdae67 | 1323 | continue; |
72b64b44 | 1324 | strbuf_addstr(&refname, de->d_name); |
d5fdae67 | 1325 | refdir = *refs->name |
72b64b44 MH |
1326 | ? git_path_submodule(refs->name, "%s", refname.buf) |
1327 | : git_path("%s", refname.buf); | |
1328 | if (stat(refdir, &st) < 0) { | |
1329 | ; /* silently ignore */ | |
1330 | } else if (S_ISDIR(st.st_mode)) { | |
abc39098 | 1331 | strbuf_addch(&refname, '/'); |
28e6a34e | 1332 | add_entry_to_dir(dir, |
b9146f51 RS |
1333 | create_dir_entry(refs, refname.buf, |
1334 | refname.len, 1)); | |
72b64b44 | 1335 | } else { |
3b124823 | 1336 | if (*refs->name) { |
f8948e2f | 1337 | hashclr(sha1); |
0bad611b | 1338 | flag = 0; |
72b64b44 | 1339 | if (resolve_gitlink_ref(refs->name, refname.buf, sha1) < 0) { |
0bad611b | 1340 | hashclr(sha1); |
98ac34b2 | 1341 | flag |= REF_ISBROKEN; |
0bad611b | 1342 | } |
7695d118 RS |
1343 | } else if (read_ref_full(refname.buf, |
1344 | RESOLVE_REF_READING, | |
1345 | sha1, &flag)) { | |
09116a1c JH |
1346 | hashclr(sha1); |
1347 | flag |= REF_ISBROKEN; | |
1348 | } | |
d0f810f0 RS |
1349 | if (check_refname_format(refname.buf, |
1350 | REFNAME_ALLOW_ONELEVEL)) { | |
1351 | hashclr(sha1); | |
1352 | flag |= REF_BAD_NAME | REF_ISBROKEN; | |
1353 | } | |
9f2fb4a3 | 1354 | add_entry_to_dir(dir, |
d0f810f0 | 1355 | create_ref_entry(refname.buf, sha1, flag, 0)); |
e1e22e37 | 1356 | } |
66a3d20b | 1357 | strbuf_setlen(&refname, dirnamelen); |
e1e22e37 | 1358 | } |
72b64b44 | 1359 | strbuf_release(&refname); |
d5fdae67 | 1360 | closedir(d); |
e1e22e37 LT |
1361 | } |
1362 | ||
d3177275 | 1363 | static struct ref_dir *get_loose_refs(struct ref_cache *refs) |
e1e22e37 | 1364 | { |
d12229f5 | 1365 | if (!refs->loose) { |
28e6a34e MH |
1366 | /* |
1367 | * Mark the top-level directory complete because we | |
1368 | * are about to read the only subdirectory that can | |
1369 | * hold references: | |
1370 | */ | |
b9146f51 | 1371 | refs->loose = create_dir_entry(refs, "", 0, 0); |
28e6a34e MH |
1372 | /* |
1373 | * Create an incomplete entry for "refs/": | |
1374 | */ | |
1375 | add_entry_to_dir(get_ref_dir(refs->loose), | |
b9146f51 | 1376 | create_dir_entry(refs, "refs/", 5, 1)); |
e1e22e37 | 1377 | } |
d7826d54 | 1378 | return get_ref_dir(refs->loose); |
e1e22e37 LT |
1379 | } |
1380 | ||
ca8db142 LT |
1381 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
1382 | #define MAXDEPTH 5 | |
0ebde32c LT |
1383 | #define MAXREFLEN (1024) |
1384 | ||
e5fa45c1 JH |
1385 | /* |
1386 | * Called by resolve_gitlink_ref_recursive() after it failed to read | |
b0626608 MH |
1387 | * from the loose refs in ref_cache refs. Find <refname> in the |
1388 | * packed-refs file for the submodule. | |
e5fa45c1 | 1389 | */ |
b0626608 | 1390 | static int resolve_gitlink_packed_ref(struct ref_cache *refs, |
85be1fe3 | 1391 | const char *refname, unsigned char *sha1) |
0ebde32c | 1392 | { |
2c5c66be | 1393 | struct ref_entry *ref; |
d3177275 | 1394 | struct ref_dir *dir = get_packed_refs(refs); |
0ebde32c | 1395 | |
432ad41e | 1396 | ref = find_ref(dir, refname); |
b0626608 MH |
1397 | if (ref == NULL) |
1398 | return -1; | |
1399 | ||
50546b15 | 1400 | hashcpy(sha1, ref->u.value.sha1); |
b0626608 | 1401 | return 0; |
0ebde32c LT |
1402 | } |
1403 | ||
b0626608 | 1404 | static int resolve_gitlink_ref_recursive(struct ref_cache *refs, |
85be1fe3 | 1405 | const char *refname, unsigned char *sha1, |
dfefa935 | 1406 | int recursion) |
0ebde32c | 1407 | { |
064d51dc | 1408 | int fd, len; |
0ebde32c | 1409 | char buffer[128], *p; |
064d51dc | 1410 | char *path; |
0ebde32c | 1411 | |
064d51dc | 1412 | if (recursion > MAXDEPTH || strlen(refname) > MAXREFLEN) |
0ebde32c | 1413 | return -1; |
064d51dc MH |
1414 | path = *refs->name |
1415 | ? git_path_submodule(refs->name, "%s", refname) | |
1416 | : git_path("%s", refname); | |
1417 | fd = open(path, O_RDONLY); | |
0ebde32c | 1418 | if (fd < 0) |
b0626608 | 1419 | return resolve_gitlink_packed_ref(refs, refname, sha1); |
0ebde32c LT |
1420 | |
1421 | len = read(fd, buffer, sizeof(buffer)-1); | |
1422 | close(fd); | |
1423 | if (len < 0) | |
1424 | return -1; | |
1425 | while (len && isspace(buffer[len-1])) | |
1426 | len--; | |
1427 | buffer[len] = 0; | |
1428 | ||
1429 | /* Was it a detached head or an old-fashioned symlink? */ | |
85be1fe3 | 1430 | if (!get_sha1_hex(buffer, sha1)) |
0ebde32c LT |
1431 | return 0; |
1432 | ||
1433 | /* Symref? */ | |
1434 | if (strncmp(buffer, "ref:", 4)) | |
1435 | return -1; | |
1436 | p = buffer + 4; | |
1437 | while (isspace(*p)) | |
1438 | p++; | |
1439 | ||
064d51dc | 1440 | return resolve_gitlink_ref_recursive(refs, p, sha1, recursion+1); |
0ebde32c LT |
1441 | } |
1442 | ||
85be1fe3 | 1443 | int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1) |
0ebde32c LT |
1444 | { |
1445 | int len = strlen(path), retval; | |
064d51dc | 1446 | char *submodule; |
b0626608 | 1447 | struct ref_cache *refs; |
0ebde32c LT |
1448 | |
1449 | while (len && path[len-1] == '/') | |
1450 | len--; | |
1451 | if (!len) | |
1452 | return -1; | |
b0626608 MH |
1453 | submodule = xstrndup(path, len); |
1454 | refs = get_ref_cache(submodule); | |
1455 | free(submodule); | |
1456 | ||
064d51dc | 1457 | retval = resolve_gitlink_ref_recursive(refs, refname, sha1, 0); |
0ebde32c LT |
1458 | return retval; |
1459 | } | |
ca8db142 | 1460 | |
4886b89f | 1461 | /* |
63331581 MH |
1462 | * Return the ref_entry for the given refname from the packed |
1463 | * references. If it does not exist, return NULL. | |
4886b89f | 1464 | */ |
63331581 | 1465 | static struct ref_entry *get_packed_ref(const char *refname) |
c224ca7f | 1466 | { |
9da31cb0 | 1467 | return find_ref(get_packed_refs(&ref_cache), refname); |
c224ca7f MH |
1468 | } |
1469 | ||
47f534bf MH |
1470 | /* |
1471 | * A loose ref file doesn't exist; check for a packed ref. The | |
1472 | * options are forwarded from resolve_safe_unsafe(). | |
1473 | */ | |
d0f810f0 RS |
1474 | static int resolve_missing_loose_ref(const char *refname, |
1475 | int resolve_flags, | |
1476 | unsigned char *sha1, | |
1477 | int *flags) | |
47f534bf MH |
1478 | { |
1479 | struct ref_entry *entry; | |
1480 | ||
1481 | /* | |
1482 | * The loose reference file does not exist; check for a packed | |
1483 | * reference. | |
1484 | */ | |
1485 | entry = get_packed_ref(refname); | |
1486 | if (entry) { | |
1487 | hashcpy(sha1, entry->u.value.sha1); | |
7695d118 RS |
1488 | if (flags) |
1489 | *flags |= REF_ISPACKED; | |
d0f810f0 | 1490 | return 0; |
47f534bf MH |
1491 | } |
1492 | /* The reference is not a packed reference, either. */ | |
7695d118 | 1493 | if (resolve_flags & RESOLVE_REF_READING) { |
d0f810f0 RS |
1494 | errno = ENOENT; |
1495 | return -1; | |
47f534bf MH |
1496 | } else { |
1497 | hashclr(sha1); | |
d0f810f0 | 1498 | return 0; |
47f534bf MH |
1499 | } |
1500 | } | |
1501 | ||
76d70dc0 | 1502 | /* This function needs to return a meaningful errno on failure */ |
7695d118 | 1503 | const char *resolve_ref_unsafe(const char *refname, int resolve_flags, unsigned char *sha1, int *flags) |
8a65ff76 | 1504 | { |
0104ca09 HO |
1505 | int depth = MAXDEPTH; |
1506 | ssize_t len; | |
a876ed83 | 1507 | char buffer[256]; |
dfefa935 | 1508 | static char refname_buffer[256]; |
d0f810f0 | 1509 | int bad_name = 0; |
ca8db142 | 1510 | |
7695d118 RS |
1511 | if (flags) |
1512 | *flags = 0; | |
8da19775 | 1513 | |
76d70dc0 | 1514 | if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) { |
d0f810f0 RS |
1515 | if (flags) |
1516 | *flags |= REF_BAD_NAME; | |
1517 | ||
1518 | if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) || | |
1519 | !refname_is_safe(refname)) { | |
1520 | errno = EINVAL; | |
1521 | return NULL; | |
1522 | } | |
1523 | /* | |
1524 | * dwim_ref() uses REF_ISBROKEN to distinguish between | |
1525 | * missing refs and refs that were present but invalid, | |
1526 | * to complain about the latter to stderr. | |
1527 | * | |
1528 | * We don't know whether the ref exists, so don't set | |
1529 | * REF_ISBROKEN yet. | |
1530 | */ | |
1531 | bad_name = 1; | |
76d70dc0 | 1532 | } |
a876ed83 | 1533 | for (;;) { |
55956350 | 1534 | char path[PATH_MAX]; |
a876ed83 JH |
1535 | struct stat st; |
1536 | char *buf; | |
1537 | int fd; | |
8a65ff76 | 1538 | |
76d70dc0 RS |
1539 | if (--depth < 0) { |
1540 | errno = ELOOP; | |
a876ed83 | 1541 | return NULL; |
76d70dc0 | 1542 | } |
ca8db142 | 1543 | |
dfefa935 | 1544 | git_snpath(path, sizeof(path), "%s", refname); |
c224ca7f | 1545 | |
fcb7c762 MH |
1546 | /* |
1547 | * We might have to loop back here to avoid a race | |
1548 | * condition: first we lstat() the file, then we try | |
1549 | * to read it as a link or as a file. But if somebody | |
1550 | * changes the type of the file (file <-> directory | |
1551 | * <-> symlink) between the lstat() and reading, then | |
1552 | * we don't want to report that as an error but rather | |
1553 | * try again starting with the lstat(). | |
1554 | */ | |
1555 | stat_ref: | |
a876ed83 | 1556 | if (lstat(path, &st) < 0) { |
d0f810f0 RS |
1557 | if (errno != ENOENT) |
1558 | return NULL; | |
1559 | if (resolve_missing_loose_ref(refname, resolve_flags, | |
1560 | sha1, flags)) | |
a876ed83 | 1561 | return NULL; |
d0f810f0 RS |
1562 | if (bad_name) { |
1563 | hashclr(sha1); | |
1564 | if (flags) | |
1565 | *flags |= REF_ISBROKEN; | |
1566 | } | |
1567 | return refname; | |
a876ed83 | 1568 | } |
ca8db142 | 1569 | |
a876ed83 JH |
1570 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
1571 | if (S_ISLNK(st.st_mode)) { | |
1572 | len = readlink(path, buffer, sizeof(buffer)-1); | |
fcb7c762 MH |
1573 | if (len < 0) { |
1574 | if (errno == ENOENT || errno == EINVAL) | |
1575 | /* inconsistent with lstat; retry */ | |
1576 | goto stat_ref; | |
1577 | else | |
1578 | return NULL; | |
1579 | } | |
b54cb795 | 1580 | buffer[len] = 0; |
59556548 | 1581 | if (starts_with(buffer, "refs/") && |
1f58a038 | 1582 | !check_refname_format(buffer, 0)) { |
dfefa935 MH |
1583 | strcpy(refname_buffer, buffer); |
1584 | refname = refname_buffer; | |
7695d118 RS |
1585 | if (flags) |
1586 | *flags |= REF_ISSYMREF; | |
62a2d525 JN |
1587 | if (resolve_flags & RESOLVE_REF_NO_RECURSE) { |
1588 | hashclr(sha1); | |
1589 | return refname; | |
1590 | } | |
a876ed83 JH |
1591 | continue; |
1592 | } | |
ca8db142 | 1593 | } |
a876ed83 | 1594 | |
7a21632f DS |
1595 | /* Is it a directory? */ |
1596 | if (S_ISDIR(st.st_mode)) { | |
1597 | errno = EISDIR; | |
1598 | return NULL; | |
1599 | } | |
1600 | ||
a876ed83 JH |
1601 | /* |
1602 | * Anything else, just open it and try to use it as | |
1603 | * a ref | |
1604 | */ | |
1605 | fd = open(path, O_RDONLY); | |
fcb7c762 MH |
1606 | if (fd < 0) { |
1607 | if (errno == ENOENT) | |
1608 | /* inconsistent with lstat; retry */ | |
1609 | goto stat_ref; | |
1610 | else | |
1611 | return NULL; | |
1612 | } | |
93d26e4c | 1613 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
76d70dc0 RS |
1614 | if (len < 0) { |
1615 | int save_errno = errno; | |
1616 | close(fd); | |
1617 | errno = save_errno; | |
28775050 | 1618 | return NULL; |
76d70dc0 RS |
1619 | } |
1620 | close(fd); | |
28775050 MH |
1621 | while (len && isspace(buffer[len-1])) |
1622 | len--; | |
1623 | buffer[len] = '\0'; | |
a876ed83 JH |
1624 | |
1625 | /* | |
1626 | * Is it a symbolic ref? | |
1627 | */ | |
59556548 | 1628 | if (!starts_with(buffer, "ref:")) { |
2884c06a MH |
1629 | /* |
1630 | * Please note that FETCH_HEAD has a second | |
1631 | * line containing other data. | |
1632 | */ | |
1633 | if (get_sha1_hex(buffer, sha1) || | |
1634 | (buffer[40] != '\0' && !isspace(buffer[40]))) { | |
7695d118 RS |
1635 | if (flags) |
1636 | *flags |= REF_ISBROKEN; | |
76d70dc0 | 1637 | errno = EINVAL; |
2884c06a MH |
1638 | return NULL; |
1639 | } | |
d0f810f0 RS |
1640 | if (bad_name) { |
1641 | hashclr(sha1); | |
1642 | if (flags) | |
1643 | *flags |= REF_ISBROKEN; | |
1644 | } | |
2884c06a MH |
1645 | return refname; |
1646 | } | |
7695d118 RS |
1647 | if (flags) |
1648 | *flags |= REF_ISSYMREF; | |
a876ed83 | 1649 | buf = buffer + 4; |
28775050 MH |
1650 | while (isspace(*buf)) |
1651 | buf++; | |
62a2d525 JN |
1652 | refname = strcpy(refname_buffer, buf); |
1653 | if (resolve_flags & RESOLVE_REF_NO_RECURSE) { | |
1654 | hashclr(sha1); | |
1655 | return refname; | |
1656 | } | |
313fb010 | 1657 | if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) { |
7695d118 RS |
1658 | if (flags) |
1659 | *flags |= REF_ISBROKEN; | |
d0f810f0 RS |
1660 | |
1661 | if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) || | |
1662 | !refname_is_safe(buf)) { | |
1663 | errno = EINVAL; | |
1664 | return NULL; | |
1665 | } | |
1666 | bad_name = 1; | |
313fb010 | 1667 | } |
8a65ff76 | 1668 | } |
a876ed83 JH |
1669 | } |
1670 | ||
7695d118 | 1671 | char *resolve_refdup(const char *ref, int resolve_flags, unsigned char *sha1, int *flags) |
96ec7b1e | 1672 | { |
092c4be7 | 1673 | return xstrdup_or_null(resolve_ref_unsafe(ref, resolve_flags, sha1, flags)); |
96ec7b1e NTND |
1674 | } |
1675 | ||
d08bae7e IL |
1676 | /* The argument to filter_refs */ |
1677 | struct ref_filter { | |
1678 | const char *pattern; | |
1679 | each_ref_fn *fn; | |
1680 | void *cb_data; | |
1681 | }; | |
1682 | ||
7695d118 | 1683 | int read_ref_full(const char *refname, int resolve_flags, unsigned char *sha1, int *flags) |
a876ed83 | 1684 | { |
7695d118 | 1685 | if (resolve_ref_unsafe(refname, resolve_flags, sha1, flags)) |
a876ed83 JH |
1686 | return 0; |
1687 | return -1; | |
8a65ff76 LT |
1688 | } |
1689 | ||
dfefa935 | 1690 | int read_ref(const char *refname, unsigned char *sha1) |
c6893323 | 1691 | { |
7695d118 | 1692 | return read_ref_full(refname, RESOLVE_REF_READING, sha1, NULL); |
c6893323 NTND |
1693 | } |
1694 | ||
bc5fd6d3 | 1695 | int ref_exists(const char *refname) |
ef06b918 | 1696 | { |
bc5fd6d3 | 1697 | unsigned char sha1[20]; |
7695d118 | 1698 | return !!resolve_ref_unsafe(refname, RESOLVE_REF_READING, sha1, NULL); |
ef06b918 JH |
1699 | } |
1700 | ||
85be1fe3 | 1701 | static int filter_refs(const char *refname, const unsigned char *sha1, int flags, |
dfefa935 | 1702 | void *data) |
d08bae7e IL |
1703 | { |
1704 | struct ref_filter *filter = (struct ref_filter *)data; | |
eb07894f | 1705 | if (wildmatch(filter->pattern, refname, 0, NULL)) |
d08bae7e | 1706 | return 0; |
85be1fe3 | 1707 | return filter->fn(refname, sha1, flags, filter->cb_data); |
d08bae7e IL |
1708 | } |
1709 | ||
68cf8703 MH |
1710 | enum peel_status { |
1711 | /* object was peeled successfully: */ | |
1712 | PEEL_PEELED = 0, | |
1713 | ||
1714 | /* | |
1715 | * object cannot be peeled because the named object (or an | |
1716 | * object referred to by a tag in the peel chain), does not | |
1717 | * exist. | |
1718 | */ | |
1719 | PEEL_INVALID = -1, | |
1720 | ||
1721 | /* object cannot be peeled because it is not a tag: */ | |
9a489f3c MH |
1722 | PEEL_NON_TAG = -2, |
1723 | ||
1724 | /* ref_entry contains no peeled value because it is a symref: */ | |
1725 | PEEL_IS_SYMREF = -3, | |
1726 | ||
1727 | /* | |
1728 | * ref_entry cannot be peeled because it is broken (i.e., the | |
1729 | * symbolic reference cannot even be resolved to an object | |
1730 | * name): | |
1731 | */ | |
1732 | PEEL_BROKEN = -4 | |
68cf8703 MH |
1733 | }; |
1734 | ||
cb2ae1c4 MH |
1735 | /* |
1736 | * Peel the named object; i.e., if the object is a tag, resolve the | |
68cf8703 MH |
1737 | * tag recursively until a non-tag is found. If successful, store the |
1738 | * result to sha1 and return PEEL_PEELED. If the object is not a tag | |
1739 | * or is not valid, return PEEL_NON_TAG or PEEL_INVALID, respectively, | |
1740 | * and leave sha1 unchanged. | |
cb2ae1c4 | 1741 | */ |
68cf8703 | 1742 | static enum peel_status peel_object(const unsigned char *name, unsigned char *sha1) |
cb2ae1c4 MH |
1743 | { |
1744 | struct object *o = lookup_unknown_object(name); | |
1745 | ||
1746 | if (o->type == OBJ_NONE) { | |
1747 | int type = sha1_object_info(name, NULL); | |
8ff226a9 | 1748 | if (type < 0 || !object_as_type(o, type, 0)) |
68cf8703 | 1749 | return PEEL_INVALID; |
cb2ae1c4 MH |
1750 | } |
1751 | ||
1752 | if (o->type != OBJ_TAG) | |
68cf8703 | 1753 | return PEEL_NON_TAG; |
cb2ae1c4 MH |
1754 | |
1755 | o = deref_tag_noverify(o); | |
1756 | if (!o) | |
68cf8703 | 1757 | return PEEL_INVALID; |
cb2ae1c4 MH |
1758 | |
1759 | hashcpy(sha1, o->sha1); | |
68cf8703 | 1760 | return PEEL_PEELED; |
cb2ae1c4 MH |
1761 | } |
1762 | ||
9a489f3c | 1763 | /* |
f85354b5 MH |
1764 | * Peel the entry (if possible) and return its new peel_status. If |
1765 | * repeel is true, re-peel the entry even if there is an old peeled | |
1766 | * value that is already stored in it. | |
694b7a19 MH |
1767 | * |
1768 | * It is OK to call this function with a packed reference entry that | |
1769 | * might be stale and might even refer to an object that has since | |
1770 | * been garbage-collected. In such a case, if the entry has | |
1771 | * REF_KNOWS_PEELED then leave the status unchanged and return | |
1772 | * PEEL_PEELED or PEEL_NON_TAG; otherwise, return PEEL_INVALID. | |
9a489f3c | 1773 | */ |
f85354b5 | 1774 | static enum peel_status peel_entry(struct ref_entry *entry, int repeel) |
9a489f3c MH |
1775 | { |
1776 | enum peel_status status; | |
1777 | ||
f85354b5 MH |
1778 | if (entry->flag & REF_KNOWS_PEELED) { |
1779 | if (repeel) { | |
1780 | entry->flag &= ~REF_KNOWS_PEELED; | |
1781 | hashclr(entry->u.value.peeled); | |
1782 | } else { | |
1783 | return is_null_sha1(entry->u.value.peeled) ? | |
1784 | PEEL_NON_TAG : PEEL_PEELED; | |
1785 | } | |
1786 | } | |
9a489f3c MH |
1787 | if (entry->flag & REF_ISBROKEN) |
1788 | return PEEL_BROKEN; | |
1789 | if (entry->flag & REF_ISSYMREF) | |
1790 | return PEEL_IS_SYMREF; | |
1791 | ||
1792 | status = peel_object(entry->u.value.sha1, entry->u.value.peeled); | |
1793 | if (status == PEEL_PEELED || status == PEEL_NON_TAG) | |
1794 | entry->flag |= REF_KNOWS_PEELED; | |
1795 | return status; | |
1796 | } | |
1797 | ||
dfefa935 | 1798 | int peel_ref(const char *refname, unsigned char *sha1) |
cf0adba7 JH |
1799 | { |
1800 | int flag; | |
1801 | unsigned char base[20]; | |
cf0adba7 | 1802 | |
dfefa935 | 1803 | if (current_ref && (current_ref->name == refname |
9a489f3c | 1804 | || !strcmp(current_ref->name, refname))) { |
f85354b5 | 1805 | if (peel_entry(current_ref, 0)) |
9a489f3c MH |
1806 | return -1; |
1807 | hashcpy(sha1, current_ref->u.value.peeled); | |
1808 | return 0; | |
0ae91be0 SP |
1809 | } |
1810 | ||
7695d118 | 1811 | if (read_ref_full(refname, RESOLVE_REF_READING, base, &flag)) |
cf0adba7 JH |
1812 | return -1; |
1813 | ||
9a489f3c MH |
1814 | /* |
1815 | * If the reference is packed, read its ref_entry from the | |
1816 | * cache in the hope that we already know its peeled value. | |
1817 | * We only try this optimization on packed references because | |
1818 | * (a) forcing the filling of the loose reference cache could | |
1819 | * be expensive and (b) loose references anyway usually do not | |
1820 | * have REF_KNOWS_PEELED. | |
1821 | */ | |
1822 | if (flag & REF_ISPACKED) { | |
f361baeb | 1823 | struct ref_entry *r = get_packed_ref(refname); |
9a489f3c | 1824 | if (r) { |
f85354b5 | 1825 | if (peel_entry(r, 0)) |
9a489f3c | 1826 | return -1; |
593f1bb8 | 1827 | hashcpy(sha1, r->u.value.peeled); |
e9c4c111 | 1828 | return 0; |
cf0adba7 | 1829 | } |
cf0adba7 JH |
1830 | } |
1831 | ||
cb2ae1c4 | 1832 | return peel_object(base, sha1); |
cf0adba7 JH |
1833 | } |
1834 | ||
bc5fd6d3 MH |
1835 | struct warn_if_dangling_data { |
1836 | FILE *fp; | |
1837 | const char *refname; | |
e6bea66d | 1838 | const struct string_list *refnames; |
bc5fd6d3 MH |
1839 | const char *msg_fmt; |
1840 | }; | |
1841 | ||
1842 | static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1, | |
1843 | int flags, void *cb_data) | |
1844 | { | |
1845 | struct warn_if_dangling_data *d = cb_data; | |
1846 | const char *resolves_to; | |
1847 | unsigned char junk[20]; | |
1848 | ||
1849 | if (!(flags & REF_ISSYMREF)) | |
1850 | return 0; | |
1851 | ||
7695d118 | 1852 | resolves_to = resolve_ref_unsafe(refname, 0, junk, NULL); |
e6bea66d JL |
1853 | if (!resolves_to |
1854 | || (d->refname | |
1855 | ? strcmp(resolves_to, d->refname) | |
1856 | : !string_list_has_string(d->refnames, resolves_to))) { | |
bc5fd6d3 | 1857 | return 0; |
e6bea66d | 1858 | } |
bc5fd6d3 MH |
1859 | |
1860 | fprintf(d->fp, d->msg_fmt, refname); | |
1be65eda | 1861 | fputc('\n', d->fp); |
bc5fd6d3 MH |
1862 | return 0; |
1863 | } | |
1864 | ||
1865 | void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname) | |
1866 | { | |
1867 | struct warn_if_dangling_data data; | |
1868 | ||
1869 | data.fp = fp; | |
1870 | data.refname = refname; | |
e6bea66d JL |
1871 | data.refnames = NULL; |
1872 | data.msg_fmt = msg_fmt; | |
1873 | for_each_rawref(warn_if_dangling_symref, &data); | |
1874 | } | |
1875 | ||
1876 | void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames) | |
1877 | { | |
1878 | struct warn_if_dangling_data data; | |
1879 | ||
1880 | data.fp = fp; | |
1881 | data.refname = NULL; | |
1882 | data.refnames = refnames; | |
bc5fd6d3 MH |
1883 | data.msg_fmt = msg_fmt; |
1884 | for_each_rawref(warn_if_dangling_symref, &data); | |
1885 | } | |
1886 | ||
fcce1703 | 1887 | /* |
65cf102b | 1888 | * Call fn for each reference in the specified ref_cache, omitting |
624cac35 MH |
1889 | * references not in the containing_dir of base. fn is called for all |
1890 | * references, including broken ones. If fn ever returns a non-zero | |
fcce1703 MH |
1891 | * value, stop the iteration and return that value; otherwise, return |
1892 | * 0. | |
1893 | */ | |
65cf102b | 1894 | static int do_for_each_entry(struct ref_cache *refs, const char *base, |
624cac35 | 1895 | each_ref_entry_fn fn, void *cb_data) |
8a65ff76 | 1896 | { |
98eeb09e JK |
1897 | struct packed_ref_cache *packed_ref_cache; |
1898 | struct ref_dir *loose_dir; | |
1899 | struct ref_dir *packed_dir; | |
933ac036 MH |
1900 | int retval = 0; |
1901 | ||
98eeb09e JK |
1902 | /* |
1903 | * We must make sure that all loose refs are read before accessing the | |
1904 | * packed-refs file; this avoids a race condition in which loose refs | |
1905 | * are migrated to the packed-refs file by a simultaneous process, but | |
1906 | * our in-memory view is from before the migration. get_packed_ref_cache() | |
1907 | * takes care of making sure our view is up to date with what is on | |
1908 | * disk. | |
1909 | */ | |
1910 | loose_dir = get_loose_refs(refs); | |
933ac036 | 1911 | if (base && *base) { |
933ac036 MH |
1912 | loose_dir = find_containing_dir(loose_dir, base, 0); |
1913 | } | |
98eeb09e JK |
1914 | if (loose_dir) |
1915 | prime_ref_dir(loose_dir); | |
1916 | ||
1917 | packed_ref_cache = get_packed_ref_cache(refs); | |
8baf2bb9 | 1918 | acquire_packed_ref_cache(packed_ref_cache); |
98eeb09e | 1919 | packed_dir = get_packed_ref_dir(packed_ref_cache); |
933ac036 MH |
1920 | if (base && *base) { |
1921 | packed_dir = find_containing_dir(packed_dir, base, 0); | |
933ac036 MH |
1922 | } |
1923 | ||
1924 | if (packed_dir && loose_dir) { | |
1925 | sort_ref_dir(packed_dir); | |
1926 | sort_ref_dir(loose_dir); | |
624cac35 MH |
1927 | retval = do_for_each_entry_in_dirs( |
1928 | packed_dir, loose_dir, fn, cb_data); | |
933ac036 MH |
1929 | } else if (packed_dir) { |
1930 | sort_ref_dir(packed_dir); | |
624cac35 MH |
1931 | retval = do_for_each_entry_in_dir( |
1932 | packed_dir, 0, fn, cb_data); | |
933ac036 MH |
1933 | } else if (loose_dir) { |
1934 | sort_ref_dir(loose_dir); | |
624cac35 MH |
1935 | retval = do_for_each_entry_in_dir( |
1936 | loose_dir, 0, fn, cb_data); | |
933ac036 MH |
1937 | } |
1938 | ||
8baf2bb9 | 1939 | release_packed_ref_cache(packed_ref_cache); |
933ac036 | 1940 | return retval; |
8a65ff76 LT |
1941 | } |
1942 | ||
624cac35 | 1943 | /* |
65cf102b | 1944 | * Call fn for each reference in the specified ref_cache for which the |
624cac35 MH |
1945 | * refname begins with base. If trim is non-zero, then trim that many |
1946 | * characters off the beginning of each refname before passing the | |
1947 | * refname to fn. flags can be DO_FOR_EACH_INCLUDE_BROKEN to include | |
1948 | * broken references in the iteration. If fn ever returns a non-zero | |
1949 | * value, stop the iteration and return that value; otherwise, return | |
1950 | * 0. | |
1951 | */ | |
65cf102b MH |
1952 | static int do_for_each_ref(struct ref_cache *refs, const char *base, |
1953 | each_ref_fn fn, int trim, int flags, void *cb_data) | |
624cac35 MH |
1954 | { |
1955 | struct ref_entry_cb data; | |
1956 | data.base = base; | |
1957 | data.trim = trim; | |
1958 | data.flags = flags; | |
1959 | data.fn = fn; | |
1960 | data.cb_data = cb_data; | |
1961 | ||
49672f26 JK |
1962 | if (ref_paranoia < 0) |
1963 | ref_paranoia = git_env_bool("GIT_REF_PARANOIA", 0); | |
1964 | if (ref_paranoia) | |
1965 | data.flags |= DO_FOR_EACH_INCLUDE_BROKEN; | |
1966 | ||
65cf102b | 1967 | return do_for_each_entry(refs, base, do_one_ref, &data); |
624cac35 MH |
1968 | } |
1969 | ||
0bad611b | 1970 | static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data) |
723c31fe LT |
1971 | { |
1972 | unsigned char sha1[20]; | |
8da19775 JH |
1973 | int flag; |
1974 | ||
0bad611b HV |
1975 | if (submodule) { |
1976 | if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0) | |
1977 | return fn("HEAD", sha1, 0, cb_data); | |
1978 | ||
1979 | return 0; | |
1980 | } | |
1981 | ||
7695d118 | 1982 | if (!read_ref_full("HEAD", RESOLVE_REF_READING, sha1, &flag)) |
8da19775 | 1983 | return fn("HEAD", sha1, flag, cb_data); |
0bad611b | 1984 | |
2f34ba32 | 1985 | return 0; |
723c31fe LT |
1986 | } |
1987 | ||
0bad611b HV |
1988 | int head_ref(each_ref_fn fn, void *cb_data) |
1989 | { | |
1990 | return do_head_ref(NULL, fn, cb_data); | |
1991 | } | |
1992 | ||
9ef6aeb0 HV |
1993 | int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
1994 | { | |
1995 | return do_head_ref(submodule, fn, cb_data); | |
1996 | } | |
1997 | ||
cb5d709f | 1998 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 1999 | { |
9da31cb0 | 2000 | return do_for_each_ref(&ref_cache, "", fn, 0, 0, cb_data); |
a62be77f SE |
2001 | } |
2002 | ||
9ef6aeb0 HV |
2003 | int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
2004 | { | |
65cf102b | 2005 | return do_for_each_ref(get_ref_cache(submodule), "", fn, 0, 0, cb_data); |
a62be77f SE |
2006 | } |
2007 | ||
2a8177b6 CC |
2008 | int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data) |
2009 | { | |
9da31cb0 | 2010 | return do_for_each_ref(&ref_cache, prefix, fn, strlen(prefix), 0, cb_data); |
2a8177b6 CC |
2011 | } |
2012 | ||
9ef6aeb0 HV |
2013 | int for_each_ref_in_submodule(const char *submodule, const char *prefix, |
2014 | each_ref_fn fn, void *cb_data) | |
2015 | { | |
65cf102b | 2016 | return do_for_each_ref(get_ref_cache(submodule), prefix, fn, strlen(prefix), 0, cb_data); |
2a8177b6 CC |
2017 | } |
2018 | ||
cb5d709f | 2019 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 2020 | { |
2a8177b6 | 2021 | return for_each_ref_in("refs/tags/", fn, cb_data); |
a62be77f SE |
2022 | } |
2023 | ||
9ef6aeb0 HV |
2024 | int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
2025 | { | |
2026 | return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data); | |
2027 | } | |
2028 | ||
cb5d709f | 2029 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 2030 | { |
2a8177b6 | 2031 | return for_each_ref_in("refs/heads/", fn, cb_data); |
a62be77f SE |
2032 | } |
2033 | ||
9ef6aeb0 HV |
2034 | int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
2035 | { | |
2036 | return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data); | |
2037 | } | |
2038 | ||
cb5d709f | 2039 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 2040 | { |
2a8177b6 | 2041 | return for_each_ref_in("refs/remotes/", fn, cb_data); |
f8948e2f JH |
2042 | } |
2043 | ||
9ef6aeb0 HV |
2044 | int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
2045 | { | |
2046 | return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data); | |
2047 | } | |
2048 | ||
29268700 CC |
2049 | int for_each_replace_ref(each_ref_fn fn, void *cb_data) |
2050 | { | |
9da31cb0 | 2051 | return do_for_each_ref(&ref_cache, "refs/replace/", fn, 13, 0, cb_data); |
29268700 CC |
2052 | } |
2053 | ||
a1bea2c1 JT |
2054 | int head_ref_namespaced(each_ref_fn fn, void *cb_data) |
2055 | { | |
2056 | struct strbuf buf = STRBUF_INIT; | |
2057 | int ret = 0; | |
2058 | unsigned char sha1[20]; | |
2059 | int flag; | |
2060 | ||
2061 | strbuf_addf(&buf, "%sHEAD", get_git_namespace()); | |
7695d118 | 2062 | if (!read_ref_full(buf.buf, RESOLVE_REF_READING, sha1, &flag)) |
a1bea2c1 JT |
2063 | ret = fn(buf.buf, sha1, flag, cb_data); |
2064 | strbuf_release(&buf); | |
2065 | ||
2066 | return ret; | |
2067 | } | |
2068 | ||
2069 | int for_each_namespaced_ref(each_ref_fn fn, void *cb_data) | |
2070 | { | |
2071 | struct strbuf buf = STRBUF_INIT; | |
2072 | int ret; | |
2073 | strbuf_addf(&buf, "%srefs/", get_git_namespace()); | |
9da31cb0 | 2074 | ret = do_for_each_ref(&ref_cache, buf.buf, fn, 0, 0, cb_data); |
a1bea2c1 JT |
2075 | strbuf_release(&buf); |
2076 | return ret; | |
2077 | } | |
2078 | ||
b09fe971 IL |
2079 | int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, |
2080 | const char *prefix, void *cb_data) | |
d08bae7e IL |
2081 | { |
2082 | struct strbuf real_pattern = STRBUF_INIT; | |
2083 | struct ref_filter filter; | |
d08bae7e IL |
2084 | int ret; |
2085 | ||
59556548 | 2086 | if (!prefix && !starts_with(pattern, "refs/")) |
d08bae7e | 2087 | strbuf_addstr(&real_pattern, "refs/"); |
b09fe971 IL |
2088 | else if (prefix) |
2089 | strbuf_addstr(&real_pattern, prefix); | |
d08bae7e IL |
2090 | strbuf_addstr(&real_pattern, pattern); |
2091 | ||
894a9d33 | 2092 | if (!has_glob_specials(pattern)) { |
9517e6b8 | 2093 | /* Append implied '/' '*' if not present. */ |
d08bae7e IL |
2094 | if (real_pattern.buf[real_pattern.len - 1] != '/') |
2095 | strbuf_addch(&real_pattern, '/'); | |
2096 | /* No need to check for '*', there is none. */ | |
2097 | strbuf_addch(&real_pattern, '*'); | |
2098 | } | |
2099 | ||
2100 | filter.pattern = real_pattern.buf; | |
2101 | filter.fn = fn; | |
2102 | filter.cb_data = cb_data; | |
2103 | ret = for_each_ref(filter_refs, &filter); | |
2104 | ||
2105 | strbuf_release(&real_pattern); | |
2106 | return ret; | |
2107 | } | |
2108 | ||
b09fe971 IL |
2109 | int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data) |
2110 | { | |
2111 | return for_each_glob_ref_in(fn, pattern, NULL, cb_data); | |
2112 | } | |
2113 | ||
f8948e2f JH |
2114 | int for_each_rawref(each_ref_fn fn, void *cb_data) |
2115 | { | |
9da31cb0 | 2116 | return do_for_each_ref(&ref_cache, "", fn, 0, |
f8948e2f | 2117 | DO_FOR_EACH_INCLUDE_BROKEN, cb_data); |
8a65ff76 LT |
2118 | } |
2119 | ||
4577e483 | 2120 | const char *prettify_refname(const char *name) |
a9c37a72 | 2121 | { |
a9c37a72 | 2122 | return name + ( |
59556548 CC |
2123 | starts_with(name, "refs/heads/") ? 11 : |
2124 | starts_with(name, "refs/tags/") ? 10 : | |
2125 | starts_with(name, "refs/remotes/") ? 13 : | |
a9c37a72 DB |
2126 | 0); |
2127 | } | |
2128 | ||
54457fe5 | 2129 | static const char *ref_rev_parse_rules[] = { |
79803322 SP |
2130 | "%.*s", |
2131 | "refs/%.*s", | |
2132 | "refs/tags/%.*s", | |
2133 | "refs/heads/%.*s", | |
2134 | "refs/remotes/%.*s", | |
2135 | "refs/remotes/%.*s/HEAD", | |
2136 | NULL | |
2137 | }; | |
2138 | ||
54457fe5 | 2139 | int refname_match(const char *abbrev_name, const char *full_name) |
79803322 SP |
2140 | { |
2141 | const char **p; | |
2142 | const int abbrev_name_len = strlen(abbrev_name); | |
2143 | ||
54457fe5 | 2144 | for (p = ref_rev_parse_rules; *p; p++) { |
79803322 SP |
2145 | if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { |
2146 | return 1; | |
2147 | } | |
2148 | } | |
2149 | ||
2150 | return 0; | |
2151 | } | |
2152 | ||
0b1e6548 RS |
2153 | static void unlock_ref(struct ref_lock *lock) |
2154 | { | |
2155 | /* Do not free lock->lk -- atexit() still looks at them */ | |
2156 | if (lock->lk) | |
2157 | rollback_lock_file(lock->lk); | |
2158 | free(lock->ref_name); | |
2159 | free(lock->orig_ref_name); | |
2160 | free(lock); | |
2161 | } | |
2162 | ||
835e3c99 | 2163 | /* This function should make sure errno is meaningful on error */ |
e5f38ec3 | 2164 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
2165 | const unsigned char *old_sha1, int mustexist) |
2166 | { | |
7695d118 RS |
2167 | if (read_ref_full(lock->ref_name, |
2168 | mustexist ? RESOLVE_REF_READING : 0, | |
2169 | lock->old_sha1, NULL)) { | |
835e3c99 | 2170 | int save_errno = errno; |
434cd0cd | 2171 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 | 2172 | unlock_ref(lock); |
835e3c99 | 2173 | errno = save_errno; |
4bd18c43 SP |
2174 | return NULL; |
2175 | } | |
a89fccd2 | 2176 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 2177 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
2178 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
2179 | unlock_ref(lock); | |
835e3c99 | 2180 | errno = EBUSY; |
4bd18c43 SP |
2181 | return NULL; |
2182 | } | |
2183 | return lock; | |
2184 | } | |
2185 | ||
7155b727 | 2186 | static int remove_empty_directories(const char *file) |
bc7127ef JH |
2187 | { |
2188 | /* we want to create a file but there is a directory there; | |
2189 | * if that is an empty directory (or a directory that contains | |
2190 | * only empty directories), remove them. | |
2191 | */ | |
7155b727 | 2192 | struct strbuf path; |
470a91ef | 2193 | int result, save_errno; |
bc7127ef | 2194 | |
7155b727 JS |
2195 | strbuf_init(&path, 20); |
2196 | strbuf_addstr(&path, file); | |
2197 | ||
a0f4afbe | 2198 | result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY); |
470a91ef | 2199 | save_errno = errno; |
7155b727 JS |
2200 | |
2201 | strbuf_release(&path); | |
470a91ef | 2202 | errno = save_errno; |
7155b727 JS |
2203 | |
2204 | return result; | |
bc7127ef JH |
2205 | } |
2206 | ||
ff74f7f1 JH |
2207 | /* |
2208 | * *string and *len will only be substituted, and *string returned (for | |
2209 | * later free()ing) if the string passed in is a magic short-hand form | |
2210 | * to name a branch. | |
2211 | */ | |
2212 | static char *substitute_branch_name(const char **string, int *len) | |
2213 | { | |
2214 | struct strbuf buf = STRBUF_INIT; | |
cf99a761 | 2215 | int ret = interpret_branch_name(*string, *len, &buf); |
ff74f7f1 JH |
2216 | |
2217 | if (ret == *len) { | |
2218 | size_t size; | |
2219 | *string = strbuf_detach(&buf, &size); | |
2220 | *len = size; | |
2221 | return (char *)*string; | |
2222 | } | |
2223 | ||
2224 | return NULL; | |
2225 | } | |
2226 | ||
2227 | int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref) | |
2228 | { | |
2229 | char *last_branch = substitute_branch_name(&str, &len); | |
2230 | const char **p, *r; | |
2231 | int refs_found = 0; | |
2232 | ||
2233 | *ref = NULL; | |
2234 | for (p = ref_rev_parse_rules; *p; p++) { | |
2235 | char fullref[PATH_MAX]; | |
2236 | unsigned char sha1_from_ref[20]; | |
2237 | unsigned char *this_result; | |
2238 | int flag; | |
2239 | ||
2240 | this_result = refs_found ? sha1_from_ref : sha1; | |
2241 | mksnpath(fullref, sizeof(fullref), *p, len, str); | |
7695d118 RS |
2242 | r = resolve_ref_unsafe(fullref, RESOLVE_REF_READING, |
2243 | this_result, &flag); | |
ff74f7f1 JH |
2244 | if (r) { |
2245 | if (!refs_found++) | |
2246 | *ref = xstrdup(r); | |
2247 | if (!warn_ambiguous_refs) | |
2248 | break; | |
55956350 | 2249 | } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) { |
ff74f7f1 | 2250 | warning("ignoring dangling symref %s.", fullref); |
55956350 JH |
2251 | } else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) { |
2252 | warning("ignoring broken ref %s.", fullref); | |
2253 | } | |
ff74f7f1 JH |
2254 | } |
2255 | free(last_branch); | |
2256 | return refs_found; | |
2257 | } | |
2258 | ||
2259 | int dwim_log(const char *str, int len, unsigned char *sha1, char **log) | |
2260 | { | |
2261 | char *last_branch = substitute_branch_name(&str, &len); | |
2262 | const char **p; | |
2263 | int logs_found = 0; | |
2264 | ||
2265 | *log = NULL; | |
2266 | for (p = ref_rev_parse_rules; *p; p++) { | |
ff74f7f1 JH |
2267 | unsigned char hash[20]; |
2268 | char path[PATH_MAX]; | |
2269 | const char *ref, *it; | |
2270 | ||
2271 | mksnpath(path, sizeof(path), *p, len, str); | |
7695d118 RS |
2272 | ref = resolve_ref_unsafe(path, RESOLVE_REF_READING, |
2273 | hash, NULL); | |
ff74f7f1 JH |
2274 | if (!ref) |
2275 | continue; | |
4da58835 | 2276 | if (reflog_exists(path)) |
ff74f7f1 | 2277 | it = path; |
4da58835 | 2278 | else if (strcmp(ref, path) && reflog_exists(ref)) |
ff74f7f1 JH |
2279 | it = ref; |
2280 | else | |
2281 | continue; | |
2282 | if (!logs_found++) { | |
2283 | *log = xstrdup(it); | |
2284 | hashcpy(sha1, hash); | |
2285 | } | |
2286 | if (!warn_ambiguous_refs) | |
2287 | break; | |
2288 | } | |
2289 | free(last_branch); | |
2290 | return logs_found; | |
2291 | } | |
2292 | ||
88b680ae | 2293 | /* |
3c93c847 | 2294 | * Locks a ref returning the lock on success and NULL on failure. |
88b680ae RS |
2295 | * On failure errno is set to something meaningful. |
2296 | */ | |
dfefa935 MH |
2297 | static struct ref_lock *lock_ref_sha1_basic(const char *refname, |
2298 | const unsigned char *old_sha1, | |
5fe7d825 | 2299 | const struct string_list *skip, |
fec14ec3 | 2300 | unsigned int flags, int *type_p) |
4bd18c43 | 2301 | { |
434cd0cd | 2302 | char *ref_file; |
dfefa935 | 2303 | const char *orig_refname = refname; |
4bd18c43 | 2304 | struct ref_lock *lock; |
5cc3cef9 | 2305 | int last_errno = 0; |
acd3b9ec | 2306 | int type, lflags; |
4431fcc4 | 2307 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
7695d118 | 2308 | int resolve_flags = 0; |
c4c61c76 | 2309 | int attempts_remaining = 3; |
4bd18c43 SP |
2310 | |
2311 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
2312 | lock->lock_fd = -1; | |
2313 | ||
7695d118 RS |
2314 | if (mustexist) |
2315 | resolve_flags |= RESOLVE_REF_READING; | |
d0f810f0 RS |
2316 | if (flags & REF_DELETING) { |
2317 | resolve_flags |= RESOLVE_REF_ALLOW_BAD_NAME; | |
2318 | if (flags & REF_NODEREF) | |
2319 | resolve_flags |= RESOLVE_REF_NO_RECURSE; | |
2320 | } | |
7695d118 RS |
2321 | |
2322 | refname = resolve_ref_unsafe(refname, resolve_flags, | |
2323 | lock->old_sha1, &type); | |
dfefa935 | 2324 | if (!refname && errno == EISDIR) { |
bc7127ef JH |
2325 | /* we are trying to lock foo but we used to |
2326 | * have foo/bar which now does not exist; | |
2327 | * it is normal for the empty directory 'foo' | |
2328 | * to remain. | |
2329 | */ | |
dfefa935 | 2330 | ref_file = git_path("%s", orig_refname); |
5cc3cef9 JH |
2331 | if (remove_empty_directories(ref_file)) { |
2332 | last_errno = errno; | |
dfefa935 | 2333 | error("there are still refs under '%s'", orig_refname); |
5cc3cef9 JH |
2334 | goto error_return; |
2335 | } | |
7695d118 RS |
2336 | refname = resolve_ref_unsafe(orig_refname, resolve_flags, |
2337 | lock->old_sha1, &type); | |
bc7127ef | 2338 | } |
68db31cc SV |
2339 | if (type_p) |
2340 | *type_p = type; | |
dfefa935 | 2341 | if (!refname) { |
5cc3cef9 | 2342 | last_errno = errno; |
818f477c | 2343 | error("unable to resolve reference %s: %s", |
dfefa935 | 2344 | orig_refname, strerror(errno)); |
5cc3cef9 | 2345 | goto error_return; |
4bd18c43 | 2346 | } |
074336e5 MH |
2347 | /* |
2348 | * If the ref did not exist and we are creating it, make sure | |
2349 | * there is no existing packed ref whose name begins with our | |
2350 | * refname, nor a packed ref whose name is a proper prefix of | |
2351 | * our refname. | |
c976d415 | 2352 | */ |
074336e5 | 2353 | if (is_null_sha1(lock->old_sha1) && |
5fe7d825 | 2354 | !is_refname_available(refname, skip, get_packed_refs(&ref_cache))) { |
f475e08e | 2355 | last_errno = ENOTDIR; |
c976d415 | 2356 | goto error_return; |
f475e08e | 2357 | } |
22a3844e | 2358 | |
c33d5174 | 2359 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 2360 | |
e5c223e9 | 2361 | lflags = 0; |
acd3b9ec | 2362 | if (flags & REF_NODEREF) { |
dfefa935 | 2363 | refname = orig_refname; |
47ba4662 | 2364 | lflags |= LOCK_NO_DEREF; |
acd3b9ec | 2365 | } |
dfefa935 MH |
2366 | lock->ref_name = xstrdup(refname); |
2367 | lock->orig_ref_name = xstrdup(orig_refname); | |
2368 | ref_file = git_path("%s", refname); | |
4bd18c43 | 2369 | |
c4c61c76 MH |
2370 | retry: |
2371 | switch (safe_create_leading_directories(ref_file)) { | |
2372 | case SCLD_OK: | |
2373 | break; /* success */ | |
2374 | case SCLD_VANISHED: | |
2375 | if (--attempts_remaining > 0) | |
2376 | goto retry; | |
2377 | /* fall through */ | |
2378 | default: | |
5cc3cef9 JH |
2379 | last_errno = errno; |
2380 | error("unable to create directory for %s", ref_file); | |
2381 | goto error_return; | |
2382 | } | |
4bd18c43 | 2383 | |
acd3b9ec | 2384 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags); |
e5c223e9 | 2385 | if (lock->lock_fd < 0) { |
06839515 | 2386 | last_errno = errno; |
e5c223e9 MH |
2387 | if (errno == ENOENT && --attempts_remaining > 0) |
2388 | /* | |
2389 | * Maybe somebody just deleted one of the | |
2390 | * directories leading to ref_file. Try | |
2391 | * again: | |
2392 | */ | |
2393 | goto retry; | |
06839515 RS |
2394 | else { |
2395 | struct strbuf err = STRBUF_INIT; | |
2396 | unable_to_lock_message(ref_file, errno, &err); | |
2397 | error("%s", err.buf); | |
33adc83d | 2398 | strbuf_release(&err); |
06839515 RS |
2399 | goto error_return; |
2400 | } | |
e5c223e9 | 2401 | } |
4bd18c43 | 2402 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; |
5cc3cef9 JH |
2403 | |
2404 | error_return: | |
2405 | unlock_ref(lock); | |
2406 | errno = last_errno; | |
2407 | return NULL; | |
4bd18c43 SP |
2408 | } |
2409 | ||
fec3137f MH |
2410 | /* |
2411 | * Write an entry to the packed-refs file for the specified refname. | |
2412 | * If peeled is non-NULL, write it as the entry's peeled value. | |
2413 | */ | |
9540ce50 | 2414 | static void write_packed_entry(FILE *fh, char *refname, unsigned char *sha1, |
fec3137f | 2415 | unsigned char *peeled) |
d66da478 | 2416 | { |
9540ce50 JK |
2417 | fprintf_or_die(fh, "%s %s\n", sha1_to_hex(sha1), refname); |
2418 | if (peeled) | |
2419 | fprintf_or_die(fh, "^%s\n", sha1_to_hex(peeled)); | |
fec3137f MH |
2420 | } |
2421 | ||
7b40d396 MH |
2422 | /* |
2423 | * An each_ref_entry_fn that writes the entry to a packed-refs file. | |
2424 | */ | |
2425 | static int write_packed_entry_fn(struct ref_entry *entry, void *cb_data) | |
2426 | { | |
7b40d396 MH |
2427 | enum peel_status peel_status = peel_entry(entry, 0); |
2428 | ||
2429 | if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG) | |
2430 | error("internal error: %s is not a valid packed reference!", | |
2431 | entry->name); | |
9540ce50 | 2432 | write_packed_entry(cb_data, entry->name, entry->u.value.sha1, |
7b40d396 MH |
2433 | peel_status == PEEL_PEELED ? |
2434 | entry->u.value.peeled : NULL); | |
2435 | return 0; | |
2436 | } | |
2437 | ||
447ff1bf | 2438 | /* This should return a meaningful errno on failure */ |
9f69d297 MH |
2439 | int lock_packed_refs(int flags) |
2440 | { | |
2441 | struct packed_ref_cache *packed_ref_cache; | |
2442 | ||
9f69d297 MH |
2443 | if (hold_lock_file_for_update(&packlock, git_path("packed-refs"), flags) < 0) |
2444 | return -1; | |
5d478f5c MH |
2445 | /* |
2446 | * Get the current packed-refs while holding the lock. If the | |
2447 | * packed-refs file has been modified since we last read it, | |
2448 | * this will automatically invalidate the cache and re-read | |
2449 | * the packed-refs file. | |
2450 | */ | |
9f69d297 MH |
2451 | packed_ref_cache = get_packed_ref_cache(&ref_cache); |
2452 | packed_ref_cache->lock = &packlock; | |
4f6b83e3 MH |
2453 | /* Increment the reference count to prevent it from being freed: */ |
2454 | acquire_packed_ref_cache(packed_ref_cache); | |
9f69d297 MH |
2455 | return 0; |
2456 | } | |
2457 | ||
d3f66555 RS |
2458 | /* |
2459 | * Commit the packed refs changes. | |
2460 | * On error we must make sure that errno contains a meaningful value. | |
2461 | */ | |
9f69d297 MH |
2462 | int commit_packed_refs(void) |
2463 | { | |
2464 | struct packed_ref_cache *packed_ref_cache = | |
2465 | get_packed_ref_cache(&ref_cache); | |
2466 | int error = 0; | |
d3f66555 | 2467 | int save_errno = 0; |
9540ce50 | 2468 | FILE *out; |
9f69d297 MH |
2469 | |
2470 | if (!packed_ref_cache->lock) | |
2471 | die("internal error: packed-refs not locked"); | |
9f69d297 | 2472 | |
6e578a31 | 2473 | out = fdopen_lock_file(packed_ref_cache->lock, "w"); |
9540ce50 JK |
2474 | if (!out) |
2475 | die_errno("unable to fdopen packed-refs descriptor"); | |
2476 | ||
2477 | fprintf_or_die(out, "%s", PACKED_REFS_HEADER); | |
9f69d297 | 2478 | do_for_each_entry_in_dir(get_packed_ref_dir(packed_ref_cache), |
9540ce50 | 2479 | 0, write_packed_entry_fn, out); |
9540ce50 | 2480 | |
d3f66555 RS |
2481 | if (commit_lock_file(packed_ref_cache->lock)) { |
2482 | save_errno = errno; | |
9f69d297 | 2483 | error = -1; |
d3f66555 | 2484 | } |
9f69d297 | 2485 | packed_ref_cache->lock = NULL; |
4f6b83e3 | 2486 | release_packed_ref_cache(packed_ref_cache); |
d3f66555 | 2487 | errno = save_errno; |
9f69d297 MH |
2488 | return error; |
2489 | } | |
2490 | ||
2491 | void rollback_packed_refs(void) | |
2492 | { | |
2493 | struct packed_ref_cache *packed_ref_cache = | |
2494 | get_packed_ref_cache(&ref_cache); | |
2495 | ||
2496 | if (!packed_ref_cache->lock) | |
2497 | die("internal error: packed-refs not locked"); | |
2498 | rollback_lock_file(packed_ref_cache->lock); | |
2499 | packed_ref_cache->lock = NULL; | |
4f6b83e3 | 2500 | release_packed_ref_cache(packed_ref_cache); |
9f69d297 MH |
2501 | clear_packed_ref_cache(&ref_cache); |
2502 | } | |
2503 | ||
32d462ce MH |
2504 | struct ref_to_prune { |
2505 | struct ref_to_prune *next; | |
2506 | unsigned char sha1[20]; | |
2507 | char name[FLEX_ARRAY]; | |
2508 | }; | |
2509 | ||
2510 | struct pack_refs_cb_data { | |
2511 | unsigned int flags; | |
267f9a8c | 2512 | struct ref_dir *packed_refs; |
32d462ce | 2513 | struct ref_to_prune *ref_to_prune; |
32d462ce MH |
2514 | }; |
2515 | ||
267f9a8c MH |
2516 | /* |
2517 | * An each_ref_entry_fn that is run over loose references only. If | |
2518 | * the loose reference can be packed, add an entry in the packed ref | |
2519 | * cache. If the reference should be pruned, also add it to | |
2520 | * ref_to_prune in the pack_refs_cb_data. | |
2521 | */ | |
2522 | static int pack_if_possible_fn(struct ref_entry *entry, void *cb_data) | |
32d462ce MH |
2523 | { |
2524 | struct pack_refs_cb_data *cb = cb_data; | |
f85354b5 | 2525 | enum peel_status peel_status; |
267f9a8c | 2526 | struct ref_entry *packed_entry; |
59556548 | 2527 | int is_tag_ref = starts_with(entry->name, "refs/tags/"); |
32d462ce | 2528 | |
267f9a8c MH |
2529 | /* ALWAYS pack tags */ |
2530 | if (!(cb->flags & PACK_REFS_ALL) && !is_tag_ref) | |
32d462ce MH |
2531 | return 0; |
2532 | ||
b2a8226d MH |
2533 | /* Do not pack symbolic or broken refs: */ |
2534 | if ((entry->flag & REF_ISSYMREF) || !ref_resolves_to_object(entry)) | |
2535 | return 0; | |
2536 | ||
267f9a8c | 2537 | /* Add a packed ref cache entry equivalent to the loose entry. */ |
f85354b5 | 2538 | peel_status = peel_entry(entry, 1); |
0f29920f | 2539 | if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG) |
f85354b5 MH |
2540 | die("internal error peeling reference %s (%s)", |
2541 | entry->name, sha1_to_hex(entry->u.value.sha1)); | |
267f9a8c MH |
2542 | packed_entry = find_ref(cb->packed_refs, entry->name); |
2543 | if (packed_entry) { | |
2544 | /* Overwrite existing packed entry with info from loose entry */ | |
2545 | packed_entry->flag = REF_ISPACKED | REF_KNOWS_PEELED; | |
2546 | hashcpy(packed_entry->u.value.sha1, entry->u.value.sha1); | |
2547 | } else { | |
2548 | packed_entry = create_ref_entry(entry->name, entry->u.value.sha1, | |
2549 | REF_ISPACKED | REF_KNOWS_PEELED, 0); | |
2550 | add_ref(cb->packed_refs, packed_entry); | |
2551 | } | |
2552 | hashcpy(packed_entry->u.value.peeled, entry->u.value.peeled); | |
32d462ce | 2553 | |
267f9a8c MH |
2554 | /* Schedule the loose reference for pruning if requested. */ |
2555 | if ((cb->flags & PACK_REFS_PRUNE)) { | |
12e77559 | 2556 | int namelen = strlen(entry->name) + 1; |
32d462ce | 2557 | struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen); |
12e77559 MH |
2558 | hashcpy(n->sha1, entry->u.value.sha1); |
2559 | strcpy(n->name, entry->name); | |
32d462ce MH |
2560 | n->next = cb->ref_to_prune; |
2561 | cb->ref_to_prune = n; | |
2562 | } | |
d66da478 MH |
2563 | return 0; |
2564 | } | |
2565 | ||
32d462ce MH |
2566 | /* |
2567 | * Remove empty parents, but spare refs/ and immediate subdirs. | |
2568 | * Note: munges *name. | |
2569 | */ | |
2570 | static void try_remove_empty_parents(char *name) | |
2571 | { | |
2572 | char *p, *q; | |
2573 | int i; | |
2574 | p = name; | |
2575 | for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */ | |
2576 | while (*p && *p != '/') | |
2577 | p++; | |
2578 | /* tolerate duplicate slashes; see check_refname_format() */ | |
2579 | while (*p == '/') | |
2580 | p++; | |
2581 | } | |
2582 | for (q = p; *q; q++) | |
2583 | ; | |
2584 | while (1) { | |
2585 | while (q > p && *q != '/') | |
2586 | q--; | |
2587 | while (q > p && *(q-1) == '/') | |
2588 | q--; | |
2589 | if (q == p) | |
2590 | break; | |
2591 | *q = '\0'; | |
2592 | if (rmdir(git_path("%s", name))) | |
2593 | break; | |
2594 | } | |
2595 | } | |
2596 | ||
2597 | /* make sure nobody touched the ref, and unlink */ | |
2598 | static void prune_ref(struct ref_to_prune *r) | |
2599 | { | |
029cdb4a RS |
2600 | struct ref_transaction *transaction; |
2601 | struct strbuf err = STRBUF_INIT; | |
32d462ce | 2602 | |
88e7dff9 | 2603 | if (check_refname_format(r->name, 0)) |
cba12021 | 2604 | return; |
32d462ce | 2605 | |
029cdb4a RS |
2606 | transaction = ref_transaction_begin(&err); |
2607 | if (!transaction || | |
2608 | ref_transaction_delete(transaction, r->name, r->sha1, | |
fb5a6bb6 | 2609 | REF_ISPRUNING, NULL, &err) || |
db7516ab | 2610 | ref_transaction_commit(transaction, &err)) { |
029cdb4a RS |
2611 | ref_transaction_free(transaction); |
2612 | error("%s", err.buf); | |
2613 | strbuf_release(&err); | |
2614 | return; | |
32d462ce | 2615 | } |
029cdb4a RS |
2616 | ref_transaction_free(transaction); |
2617 | strbuf_release(&err); | |
2618 | try_remove_empty_parents(r->name); | |
32d462ce MH |
2619 | } |
2620 | ||
2621 | static void prune_refs(struct ref_to_prune *r) | |
2622 | { | |
2623 | while (r) { | |
2624 | prune_ref(r); | |
2625 | r = r->next; | |
2626 | } | |
2627 | } | |
2628 | ||
32d462ce MH |
2629 | int pack_refs(unsigned int flags) |
2630 | { | |
32d462ce MH |
2631 | struct pack_refs_cb_data cbdata; |
2632 | ||
2633 | memset(&cbdata, 0, sizeof(cbdata)); | |
2634 | cbdata.flags = flags; | |
2635 | ||
9f69d297 | 2636 | lock_packed_refs(LOCK_DIE_ON_ERROR); |
267f9a8c | 2637 | cbdata.packed_refs = get_packed_refs(&ref_cache); |
32d462ce | 2638 | |
267f9a8c MH |
2639 | do_for_each_entry_in_dir(get_loose_refs(&ref_cache), 0, |
2640 | pack_if_possible_fn, &cbdata); | |
32d462ce | 2641 | |
9f69d297 | 2642 | if (commit_packed_refs()) |
32d462ce | 2643 | die_errno("unable to overwrite old ref-pack file"); |
9f69d297 | 2644 | |
32d462ce MH |
2645 | prune_refs(cbdata.ref_to_prune); |
2646 | return 0; | |
2647 | } | |
2648 | ||
4a45b2f3 | 2649 | int repack_without_refs(struct string_list *refnames, struct strbuf *err) |
c0277d15 | 2650 | { |
7618fd80 | 2651 | struct ref_dir *packed; |
ea56c4e0 | 2652 | struct string_list_item *refname; |
4a45b2f3 | 2653 | int ret, needs_repacking = 0, removed = 0; |
61cee0db | 2654 | |
5a603b04 JN |
2655 | assert(err); |
2656 | ||
61cee0db | 2657 | /* Look for a packed ref */ |
4a45b2f3 MH |
2658 | for_each_string_list_item(refname, refnames) { |
2659 | if (get_packed_ref(refname->string)) { | |
2660 | needs_repacking = 1; | |
61cee0db | 2661 | break; |
4a45b2f3 MH |
2662 | } |
2663 | } | |
7618fd80 | 2664 | |
61cee0db | 2665 | /* Avoid locking if we have nothing to do */ |
4a45b2f3 | 2666 | if (!needs_repacking) |
61cee0db | 2667 | return 0; /* no refname exists in packed refs */ |
7618fd80 | 2668 | |
9f69d297 | 2669 | if (lock_packed_refs(0)) { |
5a603b04 JN |
2670 | unable_to_lock_message(git_path("packed-refs"), errno, err); |
2671 | return -1; | |
1b018fd9 | 2672 | } |
9da31cb0 | 2673 | packed = get_packed_refs(&ref_cache); |
7b40d396 | 2674 | |
61cee0db | 2675 | /* Remove refnames from the cache */ |
4a45b2f3 MH |
2676 | for_each_string_list_item(refname, refnames) |
2677 | if (remove_entry(packed, refname->string) != -1) | |
61cee0db BK |
2678 | removed = 1; |
2679 | if (!removed) { | |
506a760d | 2680 | /* |
61cee0db | 2681 | * All packed entries disappeared while we were |
506a760d MH |
2682 | * acquiring the lock. |
2683 | */ | |
9f69d297 | 2684 | rollback_packed_refs(); |
506a760d MH |
2685 | return 0; |
2686 | } | |
7b40d396 | 2687 | |
61cee0db | 2688 | /* Write what remains */ |
60bca085 | 2689 | ret = commit_packed_refs(); |
5a603b04 | 2690 | if (ret) |
60bca085 RS |
2691 | strbuf_addf(err, "unable to overwrite old ref-pack file: %s", |
2692 | strerror(errno)); | |
2693 | return ret; | |
c0277d15 JH |
2694 | } |
2695 | ||
dbdcac7d | 2696 | static int delete_ref_loose(struct ref_lock *lock, int flag, struct strbuf *err) |
2ddb5d17 | 2697 | { |
5a603b04 JN |
2698 | assert(err); |
2699 | ||
045a476f | 2700 | if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) { |
91f1f191 MH |
2701 | /* |
2702 | * loose. The loose file name is the same as the | |
2703 | * lockfile name, minus ".lock": | |
2704 | */ | |
ec38b4e4 | 2705 | char *loose_filename = get_locked_file_path(lock->lk); |
dbdcac7d | 2706 | int res = unlink_or_msg(loose_filename, err); |
91f1f191 | 2707 | free(loose_filename); |
dbdcac7d | 2708 | if (res) |
2ddb5d17 | 2709 | return 1; |
c0277d15 | 2710 | } |
2ddb5d17 BK |
2711 | return 0; |
2712 | } | |
2713 | ||
fec14ec3 | 2714 | int delete_ref(const char *refname, const unsigned char *sha1, unsigned int flags) |
c0277d15 | 2715 | { |
7521cc46 RS |
2716 | struct ref_transaction *transaction; |
2717 | struct strbuf err = STRBUF_INIT; | |
c0277d15 | 2718 | |
7521cc46 RS |
2719 | transaction = ref_transaction_begin(&err); |
2720 | if (!transaction || | |
fb5a6bb6 MH |
2721 | ref_transaction_delete(transaction, refname, |
2722 | (sha1 && !is_null_sha1(sha1)) ? sha1 : NULL, | |
2723 | flags, NULL, &err) || | |
db7516ab | 2724 | ref_transaction_commit(transaction, &err)) { |
7521cc46 RS |
2725 | error("%s", err.buf); |
2726 | ref_transaction_free(transaction); | |
2727 | strbuf_release(&err); | |
c0277d15 | 2728 | return 1; |
7521cc46 RS |
2729 | } |
2730 | ref_transaction_free(transaction); | |
2731 | strbuf_release(&err); | |
2732 | return 0; | |
4bd18c43 SP |
2733 | } |
2734 | ||
765c2258 PH |
2735 | /* |
2736 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
2737 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
2738 | * | |
2739 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
2740 | * live into logs/refs. | |
2741 | */ | |
2742 | #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log" | |
2743 | ||
fa59ae79 MH |
2744 | static int rename_tmp_log(const char *newrefname) |
2745 | { | |
f1e9e9a4 | 2746 | int attempts_remaining = 4; |
ae4a283e MH |
2747 | |
2748 | retry: | |
08f555cb MH |
2749 | switch (safe_create_leading_directories(git_path("logs/%s", newrefname))) { |
2750 | case SCLD_OK: | |
2751 | break; /* success */ | |
2752 | case SCLD_VANISHED: | |
2753 | if (--attempts_remaining > 0) | |
2754 | goto retry; | |
2755 | /* fall through */ | |
2756 | default: | |
fa59ae79 MH |
2757 | error("unable to create directory for %s", newrefname); |
2758 | return -1; | |
2759 | } | |
2760 | ||
fa59ae79 | 2761 | if (rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname))) { |
f1e9e9a4 | 2762 | if ((errno==EISDIR || errno==ENOTDIR) && --attempts_remaining > 0) { |
fa59ae79 MH |
2763 | /* |
2764 | * rename(a, b) when b is an existing | |
2765 | * directory ought to result in ISDIR, but | |
2766 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
2767 | */ | |
2768 | if (remove_empty_directories(git_path("logs/%s", newrefname))) { | |
2769 | error("Directory not empty: logs/%s", newrefname); | |
2770 | return -1; | |
2771 | } | |
2772 | goto retry; | |
ae4a283e MH |
2773 | } else if (errno == ENOENT && --attempts_remaining > 0) { |
2774 | /* | |
2775 | * Maybe another process just deleted one of | |
2776 | * the directories in the path to newrefname. | |
2777 | * Try again from the beginning. | |
2778 | */ | |
2779 | goto retry; | |
fa59ae79 MH |
2780 | } else { |
2781 | error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s", | |
2782 | newrefname, strerror(errno)); | |
2783 | return -1; | |
2784 | } | |
2785 | } | |
2786 | return 0; | |
2787 | } | |
2788 | ||
5fe7d825 RS |
2789 | static int rename_ref_available(const char *oldname, const char *newname) |
2790 | { | |
2791 | struct string_list skip = STRING_LIST_INIT_NODUP; | |
2792 | int ret; | |
2793 | ||
2794 | string_list_insert(&skip, oldname); | |
2795 | ret = is_refname_available(newname, &skip, get_packed_refs(&ref_cache)) | |
2796 | && is_refname_available(newname, &skip, get_loose_refs(&ref_cache)); | |
2797 | string_list_clear(&skip, 0); | |
2798 | return ret; | |
2799 | } | |
2800 | ||
aae383db RS |
2801 | static int write_ref_sha1(struct ref_lock *lock, const unsigned char *sha1, |
2802 | const char *logmsg); | |
2803 | ||
dfefa935 | 2804 | int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg) |
c976d415 | 2805 | { |
c976d415 LH |
2806 | unsigned char sha1[20], orig_sha1[20]; |
2807 | int flag = 0, logmoved = 0; | |
2808 | struct ref_lock *lock; | |
c976d415 | 2809 | struct stat loginfo; |
dfefa935 | 2810 | int log = !lstat(git_path("logs/%s", oldrefname), &loginfo); |
eca35a25 | 2811 | const char *symref = NULL; |
c976d415 | 2812 | |
450d4c0f | 2813 | if (log && S_ISLNK(loginfo.st_mode)) |
dfefa935 | 2814 | return error("reflog for %s is a symlink", oldrefname); |
c976d415 | 2815 | |
7695d118 RS |
2816 | symref = resolve_ref_unsafe(oldrefname, RESOLVE_REF_READING, |
2817 | orig_sha1, &flag); | |
eca35a25 | 2818 | if (flag & REF_ISSYMREF) |
fa58186c | 2819 | return error("refname %s is a symbolic ref, renaming it is not supported", |
dfefa935 | 2820 | oldrefname); |
eca35a25 | 2821 | if (!symref) |
dfefa935 | 2822 | return error("refname %s not found", oldrefname); |
c976d415 | 2823 | |
5fe7d825 | 2824 | if (!rename_ref_available(oldrefname, newrefname)) |
c976d415 LH |
2825 | return 1; |
2826 | ||
dfefa935 | 2827 | if (log && rename(git_path("logs/%s", oldrefname), git_path(TMP_RENAMED_LOG))) |
765c2258 | 2828 | return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s", |
dfefa935 | 2829 | oldrefname, strerror(errno)); |
c976d415 | 2830 | |
dfefa935 MH |
2831 | if (delete_ref(oldrefname, orig_sha1, REF_NODEREF)) { |
2832 | error("unable to delete old %s", oldrefname); | |
c976d415 LH |
2833 | goto rollback; |
2834 | } | |
2835 | ||
7695d118 | 2836 | if (!read_ref_full(newrefname, RESOLVE_REF_READING, sha1, NULL) && |
dfefa935 | 2837 | delete_ref(newrefname, sha1, REF_NODEREF)) { |
c976d415 | 2838 | if (errno==EISDIR) { |
dfefa935 MH |
2839 | if (remove_empty_directories(git_path("%s", newrefname))) { |
2840 | error("Directory not empty: %s", newrefname); | |
c976d415 LH |
2841 | goto rollback; |
2842 | } | |
2843 | } else { | |
dfefa935 | 2844 | error("unable to delete existing %s", newrefname); |
c976d415 LH |
2845 | goto rollback; |
2846 | } | |
2847 | } | |
2848 | ||
fa59ae79 | 2849 | if (log && rename_tmp_log(newrefname)) |
c976d415 | 2850 | goto rollback; |
c976d415 | 2851 | |
c976d415 LH |
2852 | logmoved = log; |
2853 | ||
5fe7d825 | 2854 | lock = lock_ref_sha1_basic(newrefname, NULL, NULL, 0, NULL); |
c976d415 | 2855 | if (!lock) { |
dfefa935 | 2856 | error("unable to lock %s for update", newrefname); |
c976d415 LH |
2857 | goto rollback; |
2858 | } | |
c976d415 | 2859 | hashcpy(lock->old_sha1, orig_sha1); |
678d0f4c | 2860 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
dfefa935 | 2861 | error("unable to write current sha1 into %s", newrefname); |
c976d415 LH |
2862 | goto rollback; |
2863 | } | |
2864 | ||
2865 | return 0; | |
2866 | ||
2867 | rollback: | |
5fe7d825 | 2868 | lock = lock_ref_sha1_basic(oldrefname, NULL, NULL, 0, NULL); |
c976d415 | 2869 | if (!lock) { |
dfefa935 | 2870 | error("unable to lock %s for rollback", oldrefname); |
c976d415 LH |
2871 | goto rollbacklog; |
2872 | } | |
2873 | ||
c976d415 LH |
2874 | flag = log_all_ref_updates; |
2875 | log_all_ref_updates = 0; | |
2876 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
dfefa935 | 2877 | error("unable to write current sha1 into %s", oldrefname); |
c976d415 LH |
2878 | log_all_ref_updates = flag; |
2879 | ||
2880 | rollbacklog: | |
dfefa935 | 2881 | if (logmoved && rename(git_path("logs/%s", newrefname), git_path("logs/%s", oldrefname))) |
c976d415 | 2882 | error("unable to restore logfile %s from %s: %s", |
dfefa935 | 2883 | oldrefname, newrefname, strerror(errno)); |
c976d415 | 2884 | if (!logmoved && log && |
dfefa935 | 2885 | rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldrefname))) |
765c2258 | 2886 | error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s", |
dfefa935 | 2887 | oldrefname, strerror(errno)); |
c976d415 LH |
2888 | |
2889 | return 1; | |
2890 | } | |
2891 | ||
0b1e6548 | 2892 | static int close_ref(struct ref_lock *lock) |
b531394d BC |
2893 | { |
2894 | if (close_lock_file(lock->lk)) | |
2895 | return -1; | |
2896 | lock->lock_fd = -1; | |
2897 | return 0; | |
2898 | } | |
2899 | ||
0b1e6548 | 2900 | static int commit_ref(struct ref_lock *lock) |
b531394d BC |
2901 | { |
2902 | if (commit_lock_file(lock->lk)) | |
2903 | return -1; | |
2904 | lock->lock_fd = -1; | |
2905 | return 0; | |
2906 | } | |
2907 | ||
0ec29a47 JH |
2908 | /* |
2909 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
2910 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
2911 | * because reflog file is one line per entry. | |
2912 | */ | |
2913 | static int copy_msg(char *buf, const char *msg) | |
2914 | { | |
2915 | char *cp = buf; | |
2916 | char c; | |
2917 | int wasspace = 1; | |
2918 | ||
2919 | *cp++ = '\t'; | |
2920 | while ((c = *msg++)) { | |
2921 | if (wasspace && isspace(c)) | |
2922 | continue; | |
2923 | wasspace = isspace(c); | |
2924 | if (wasspace) | |
2925 | c = ' '; | |
2926 | *cp++ = c; | |
2927 | } | |
2928 | while (buf < cp && isspace(cp[-1])) | |
2929 | cp--; | |
2930 | *cp++ = '\n'; | |
2931 | return cp - buf; | |
2932 | } | |
2933 | ||
bd3b02da | 2934 | /* This function must set a meaningful errno on failure */ |
dfefa935 | 2935 | int log_ref_setup(const char *refname, char *logfile, int bufsize) |
6de08ae6 | 2936 | { |
859c3017 | 2937 | int logfd, oflags = O_APPEND | O_WRONLY; |
9a13f0b7 | 2938 | |
dfefa935 | 2939 | git_snpath(logfile, bufsize, "logs/%s", refname); |
4057deb5 | 2940 | if (log_all_ref_updates && |
59556548 CC |
2941 | (starts_with(refname, "refs/heads/") || |
2942 | starts_with(refname, "refs/remotes/") || | |
2943 | starts_with(refname, "refs/notes/") || | |
dfefa935 | 2944 | !strcmp(refname, "HEAD"))) { |
bd3b02da RS |
2945 | if (safe_create_leading_directories(logfile) < 0) { |
2946 | int save_errno = errno; | |
2947 | error("unable to create directory for %s", logfile); | |
2948 | errno = save_errno; | |
2949 | return -1; | |
2950 | } | |
6de08ae6 SP |
2951 | oflags |= O_CREAT; |
2952 | } | |
2953 | ||
157aaea5 | 2954 | logfd = open(logfile, oflags, 0666); |
6de08ae6 | 2955 | if (logfd < 0) { |
9233887c | 2956 | if (!(oflags & O_CREAT) && (errno == ENOENT || errno == EISDIR)) |
6de08ae6 | 2957 | return 0; |
3b463c3f | 2958 | |
9233887c | 2959 | if (errno == EISDIR) { |
157aaea5 | 2960 | if (remove_empty_directories(logfile)) { |
bd3b02da RS |
2961 | int save_errno = errno; |
2962 | error("There are still logs under '%s'", | |
2963 | logfile); | |
2964 | errno = save_errno; | |
2965 | return -1; | |
3b463c3f | 2966 | } |
157aaea5 | 2967 | logfd = open(logfile, oflags, 0666); |
3b463c3f JH |
2968 | } |
2969 | ||
bd3b02da RS |
2970 | if (logfd < 0) { |
2971 | int save_errno = errno; | |
2972 | error("Unable to append to %s: %s", logfile, | |
2973 | strerror(errno)); | |
2974 | errno = save_errno; | |
2975 | return -1; | |
2976 | } | |
6de08ae6 SP |
2977 | } |
2978 | ||
157aaea5 | 2979 | adjust_shared_perm(logfile); |
859c3017 EM |
2980 | close(logfd); |
2981 | return 0; | |
2982 | } | |
443b92b6 | 2983 | |
2c6207ab RS |
2984 | static int log_ref_write_fd(int fd, const unsigned char *old_sha1, |
2985 | const unsigned char *new_sha1, | |
2986 | const char *committer, const char *msg) | |
2987 | { | |
2988 | int msglen, written; | |
2989 | unsigned maxlen, len; | |
2990 | char *logrec; | |
2991 | ||
2992 | msglen = msg ? strlen(msg) : 0; | |
2993 | maxlen = strlen(committer) + msglen + 100; | |
2994 | logrec = xmalloc(maxlen); | |
2995 | len = sprintf(logrec, "%s %s %s\n", | |
2996 | sha1_to_hex(old_sha1), | |
2997 | sha1_to_hex(new_sha1), | |
2998 | committer); | |
2999 | if (msglen) | |
3000 | len += copy_msg(logrec + len - 1, msg) - 1; | |
3001 | ||
3002 | written = len <= maxlen ? write_in_full(fd, logrec, len) : -1; | |
3003 | free(logrec); | |
3004 | if (written != len) | |
3005 | return -1; | |
3006 | ||
3007 | return 0; | |
3008 | } | |
3009 | ||
dfefa935 | 3010 | static int log_ref_write(const char *refname, const unsigned char *old_sha1, |
859c3017 EM |
3011 | const unsigned char *new_sha1, const char *msg) |
3012 | { | |
2c6207ab | 3013 | int logfd, result, oflags = O_APPEND | O_WRONLY; |
157aaea5 | 3014 | char log_file[PATH_MAX]; |
859c3017 EM |
3015 | |
3016 | if (log_all_ref_updates < 0) | |
3017 | log_all_ref_updates = !is_bare_repository(); | |
3018 | ||
dfefa935 | 3019 | result = log_ref_setup(refname, log_file, sizeof(log_file)); |
859c3017 EM |
3020 | if (result) |
3021 | return result; | |
3022 | ||
3023 | logfd = open(log_file, oflags); | |
3024 | if (logfd < 0) | |
3025 | return 0; | |
2c6207ab RS |
3026 | result = log_ref_write_fd(logfd, old_sha1, new_sha1, |
3027 | git_committer_info(0), msg); | |
3028 | if (result) { | |
dc615de8 RS |
3029 | int save_errno = errno; |
3030 | close(logfd); | |
3031 | error("Unable to append to %s", log_file); | |
3032 | errno = save_errno; | |
3033 | return -1; | |
3034 | } | |
3035 | if (close(logfd)) { | |
3036 | int save_errno = errno; | |
3037 | error("Unable to append to %s", log_file); | |
3038 | errno = save_errno; | |
3039 | return -1; | |
3040 | } | |
6de08ae6 SP |
3041 | return 0; |
3042 | } | |
3043 | ||
e7e0f26e | 3044 | int is_branch(const char *refname) |
c3b0dec5 | 3045 | { |
59556548 | 3046 | return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/"); |
c3b0dec5 LT |
3047 | } |
3048 | ||
aae383db RS |
3049 | /* |
3050 | * Write sha1 into the ref specified by the lock. Make sure that errno | |
3051 | * is sane on error. | |
3052 | */ | |
3053 | static int write_ref_sha1(struct ref_lock *lock, | |
4bd18c43 SP |
3054 | const unsigned char *sha1, const char *logmsg) |
3055 | { | |
3056 | static char term = '\n'; | |
c3b0dec5 | 3057 | struct object *o; |
4bd18c43 | 3058 | |
c3b0dec5 LT |
3059 | o = parse_object(sha1); |
3060 | if (!o) { | |
7be8b3ba | 3061 | error("Trying to write ref %s with nonexistent object %s", |
c3b0dec5 LT |
3062 | lock->ref_name, sha1_to_hex(sha1)); |
3063 | unlock_ref(lock); | |
dc615de8 | 3064 | errno = EINVAL; |
c3b0dec5 LT |
3065 | return -1; |
3066 | } | |
3067 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
3068 | error("Trying to write non-commit object %s to branch %s", | |
3069 | sha1_to_hex(sha1), lock->ref_name); | |
3070 | unlock_ref(lock); | |
dc615de8 | 3071 | errno = EINVAL; |
c3b0dec5 LT |
3072 | return -1; |
3073 | } | |
93822c22 | 3074 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
dc615de8 RS |
3075 | write_in_full(lock->lock_fd, &term, 1) != 1 || |
3076 | close_ref(lock) < 0) { | |
3077 | int save_errno = errno; | |
cf6950d3 | 3078 | error("Couldn't write %s", lock->lk->filename.buf); |
4bd18c43 | 3079 | unlock_ref(lock); |
dc615de8 | 3080 | errno = save_errno; |
4bd18c43 SP |
3081 | return -1; |
3082 | } | |
9da31cb0 | 3083 | clear_loose_ref_cache(&ref_cache); |
bd104db1 NP |
3084 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
3085 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
3086 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
3087 | unlock_ref(lock); |
3088 | return -1; | |
3089 | } | |
605fac8b NP |
3090 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
3091 | /* | |
3092 | * Special hack: If a branch is updated directly and HEAD | |
3093 | * points to it (may happen on the remote side of a push | |
3094 | * for example) then logically the HEAD reflog should be | |
3095 | * updated too. | |
3096 | * A generic solution implies reverse symref information, | |
3097 | * but finding all symrefs pointing to the given branch | |
3098 | * would be rather costly for this rare event (the direct | |
3099 | * update of a branch) to be worth it. So let's cheat and | |
3100 | * check with HEAD only which should cover 99% of all usage | |
3101 | * scenarios (even 100% of the default ones). | |
3102 | */ | |
3103 | unsigned char head_sha1[20]; | |
3104 | int head_flag; | |
3105 | const char *head_ref; | |
7695d118 RS |
3106 | head_ref = resolve_ref_unsafe("HEAD", RESOLVE_REF_READING, |
3107 | head_sha1, &head_flag); | |
605fac8b NP |
3108 | if (head_ref && (head_flag & REF_ISSYMREF) && |
3109 | !strcmp(head_ref, lock->ref_name)) | |
3110 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
3111 | } | |
b531394d | 3112 | if (commit_ref(lock)) { |
434cd0cd | 3113 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
3114 | unlock_ref(lock); |
3115 | return -1; | |
3116 | } | |
4bd18c43 SP |
3117 | unlock_ref(lock); |
3118 | return 0; | |
95fc7512 | 3119 | } |
d556fae2 | 3120 | |
8b5157e4 NP |
3121 | int create_symref(const char *ref_target, const char *refs_heads_master, |
3122 | const char *logmsg) | |
41b625b0 NP |
3123 | { |
3124 | const char *lockpath; | |
3125 | char ref[1000]; | |
3126 | int fd, len, written; | |
a4f34cbb | 3127 | char *git_HEAD = git_pathdup("%s", ref_target); |
8b5157e4 NP |
3128 | unsigned char old_sha1[20], new_sha1[20]; |
3129 | ||
3130 | if (logmsg && read_ref(ref_target, old_sha1)) | |
3131 | hashclr(old_sha1); | |
41b625b0 | 3132 | |
d48744d1 JH |
3133 | if (safe_create_leading_directories(git_HEAD) < 0) |
3134 | return error("unable to create directory for %s", git_HEAD); | |
3135 | ||
41b625b0 NP |
3136 | #ifndef NO_SYMLINK_HEAD |
3137 | if (prefer_symlink_refs) { | |
3138 | unlink(git_HEAD); | |
3139 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 3140 | goto done; |
41b625b0 NP |
3141 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
3142 | } | |
3143 | #endif | |
3144 | ||
3145 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
3146 | if (sizeof(ref) <= len) { | |
3147 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 3148 | goto error_free_return; |
41b625b0 NP |
3149 | } |
3150 | lockpath = mkpath("%s.lock", git_HEAD); | |
3151 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
3152 | if (fd < 0) { | |
3153 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 3154 | goto error_free_return; |
41b625b0 NP |
3155 | } |
3156 | written = write_in_full(fd, ref, len); | |
91c8d590 | 3157 | if (close(fd) != 0 || written != len) { |
41b625b0 | 3158 | error("Unable to write to %s", lockpath); |
47fc52e2 | 3159 | goto error_unlink_return; |
41b625b0 NP |
3160 | } |
3161 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 3162 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 3163 | goto error_unlink_return; |
41b625b0 NP |
3164 | } |
3165 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 3166 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 | 3167 | error_unlink_return: |
691f1a28 | 3168 | unlink_or_warn(lockpath); |
47fc52e2 JH |
3169 | error_free_return: |
3170 | free(git_HEAD); | |
3171 | return -1; | |
41b625b0 | 3172 | } |
8b5157e4 | 3173 | |
ee96d11b | 3174 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 3175 | done: |
ee96d11b | 3176 | #endif |
8b5157e4 NP |
3177 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
3178 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
3179 | ||
47fc52e2 | 3180 | free(git_HEAD); |
41b625b0 NP |
3181 | return 0; |
3182 | } | |
3183 | ||
4207ed28 RS |
3184 | struct read_ref_at_cb { |
3185 | const char *refname; | |
3186 | unsigned long at_time; | |
3187 | int cnt; | |
3188 | int reccnt; | |
3189 | unsigned char *sha1; | |
3190 | int found_it; | |
3191 | ||
3192 | unsigned char osha1[20]; | |
3193 | unsigned char nsha1[20]; | |
3194 | int tz; | |
3195 | unsigned long date; | |
3196 | char **msg; | |
3197 | unsigned long *cutoff_time; | |
3198 | int *cutoff_tz; | |
3199 | int *cutoff_cnt; | |
3200 | }; | |
3201 | ||
3202 | static int read_ref_at_ent(unsigned char *osha1, unsigned char *nsha1, | |
3203 | const char *email, unsigned long timestamp, int tz, | |
3204 | const char *message, void *cb_data) | |
3205 | { | |
3206 | struct read_ref_at_cb *cb = cb_data; | |
3207 | ||
3208 | cb->reccnt++; | |
3209 | cb->tz = tz; | |
3210 | cb->date = timestamp; | |
3211 | ||
3212 | if (timestamp <= cb->at_time || cb->cnt == 0) { | |
3213 | if (cb->msg) | |
3214 | *cb->msg = xstrdup(message); | |
3215 | if (cb->cutoff_time) | |
3216 | *cb->cutoff_time = timestamp; | |
3217 | if (cb->cutoff_tz) | |
3218 | *cb->cutoff_tz = tz; | |
3219 | if (cb->cutoff_cnt) | |
3220 | *cb->cutoff_cnt = cb->reccnt - 1; | |
3221 | /* | |
3222 | * we have not yet updated cb->[n|o]sha1 so they still | |
3223 | * hold the values for the previous record. | |
3224 | */ | |
3225 | if (!is_null_sha1(cb->osha1)) { | |
3226 | hashcpy(cb->sha1, nsha1); | |
3227 | if (hashcmp(cb->osha1, nsha1)) | |
3228 | warning("Log for ref %s has gap after %s.", | |
3229 | cb->refname, show_date(cb->date, cb->tz, DATE_RFC2822)); | |
3230 | } | |
3231 | else if (cb->date == cb->at_time) | |
3232 | hashcpy(cb->sha1, nsha1); | |
3233 | else if (hashcmp(nsha1, cb->sha1)) | |
3234 | warning("Log for ref %s unexpectedly ended on %s.", | |
3235 | cb->refname, show_date(cb->date, cb->tz, | |
3236 | DATE_RFC2822)); | |
3237 | hashcpy(cb->osha1, osha1); | |
3238 | hashcpy(cb->nsha1, nsha1); | |
3239 | cb->found_it = 1; | |
3240 | return 1; | |
3241 | } | |
3242 | hashcpy(cb->osha1, osha1); | |
3243 | hashcpy(cb->nsha1, nsha1); | |
3244 | if (cb->cnt > 0) | |
3245 | cb->cnt--; | |
3246 | return 0; | |
3247 | } | |
3248 | ||
3249 | static int read_ref_at_ent_oldest(unsigned char *osha1, unsigned char *nsha1, | |
3250 | const char *email, unsigned long timestamp, | |
3251 | int tz, const char *message, void *cb_data) | |
3252 | { | |
3253 | struct read_ref_at_cb *cb = cb_data; | |
3254 | ||
3255 | if (cb->msg) | |
3256 | *cb->msg = xstrdup(message); | |
3257 | if (cb->cutoff_time) | |
3258 | *cb->cutoff_time = timestamp; | |
3259 | if (cb->cutoff_tz) | |
3260 | *cb->cutoff_tz = tz; | |
3261 | if (cb->cutoff_cnt) | |
3262 | *cb->cutoff_cnt = cb->reccnt; | |
3263 | hashcpy(cb->sha1, osha1); | |
3264 | if (is_null_sha1(cb->sha1)) | |
3265 | hashcpy(cb->sha1, nsha1); | |
3266 | /* We just want the first entry */ | |
3267 | return 1; | |
16d7cc90 JH |
3268 | } |
3269 | ||
c41a87dd | 3270 | int read_ref_at(const char *refname, unsigned int flags, unsigned long at_time, int cnt, |
dfefa935 MH |
3271 | unsigned char *sha1, char **msg, |
3272 | unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt) | |
d556fae2 | 3273 | { |
4207ed28 | 3274 | struct read_ref_at_cb cb; |
d556fae2 | 3275 | |
4207ed28 RS |
3276 | memset(&cb, 0, sizeof(cb)); |
3277 | cb.refname = refname; | |
3278 | cb.at_time = at_time; | |
3279 | cb.cnt = cnt; | |
3280 | cb.msg = msg; | |
3281 | cb.cutoff_time = cutoff_time; | |
3282 | cb.cutoff_tz = cutoff_tz; | |
3283 | cb.cutoff_cnt = cutoff_cnt; | |
3284 | cb.sha1 = sha1; | |
3285 | ||
3286 | for_each_reflog_ent_reverse(refname, read_ref_at_ent, &cb); | |
3287 | ||
c41a87dd DA |
3288 | if (!cb.reccnt) { |
3289 | if (flags & GET_SHA1_QUIETLY) | |
3290 | exit(128); | |
3291 | else | |
3292 | die("Log for %s is empty.", refname); | |
3293 | } | |
4207ed28 RS |
3294 | if (cb.found_it) |
3295 | return 0; | |
3296 | ||
3297 | for_each_reflog_ent(refname, read_ref_at_ent_oldest, &cb); | |
d556fae2 | 3298 | |
16d7cc90 | 3299 | return 1; |
d556fae2 | 3300 | } |
2ff81662 | 3301 | |
4da58835 RS |
3302 | int reflog_exists(const char *refname) |
3303 | { | |
3304 | struct stat st; | |
3305 | ||
3306 | return !lstat(git_path("logs/%s", refname), &st) && | |
3307 | S_ISREG(st.st_mode); | |
3308 | } | |
3309 | ||
3310 | int delete_reflog(const char *refname) | |
3311 | { | |
3312 | return remove_path(git_path("logs/%s", refname)); | |
3313 | } | |
3314 | ||
9a7a183b JH |
3315 | static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data) |
3316 | { | |
3317 | unsigned char osha1[20], nsha1[20]; | |
3318 | char *email_end, *message; | |
3319 | unsigned long timestamp; | |
3320 | int tz; | |
3321 | ||
3322 | /* old SP new SP name <email> SP time TAB msg LF */ | |
3323 | if (sb->len < 83 || sb->buf[sb->len - 1] != '\n' || | |
3324 | get_sha1_hex(sb->buf, osha1) || sb->buf[40] != ' ' || | |
3325 | get_sha1_hex(sb->buf + 41, nsha1) || sb->buf[81] != ' ' || | |
3326 | !(email_end = strchr(sb->buf + 82, '>')) || | |
3327 | email_end[1] != ' ' || | |
3328 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
3329 | !message || message[0] != ' ' || | |
3330 | (message[1] != '+' && message[1] != '-') || | |
3331 | !isdigit(message[2]) || !isdigit(message[3]) || | |
3332 | !isdigit(message[4]) || !isdigit(message[5])) | |
3333 | return 0; /* corrupt? */ | |
3334 | email_end[1] = '\0'; | |
3335 | tz = strtol(message + 1, NULL, 10); | |
3336 | if (message[6] != '\t') | |
3337 | message += 6; | |
3338 | else | |
3339 | message += 7; | |
3340 | return fn(osha1, nsha1, sb->buf + 82, timestamp, tz, message, cb_data); | |
3341 | } | |
3342 | ||
98f85ff4 JH |
3343 | static char *find_beginning_of_line(char *bob, char *scan) |
3344 | { | |
3345 | while (bob < scan && *(--scan) != '\n') | |
3346 | ; /* keep scanning backwards */ | |
3347 | /* | |
3348 | * Return either beginning of the buffer, or LF at the end of | |
3349 | * the previous line. | |
3350 | */ | |
3351 | return scan; | |
3352 | } | |
3353 | ||
3354 | int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void *cb_data) | |
2ff81662 | 3355 | { |
8ca78803 | 3356 | struct strbuf sb = STRBUF_INIT; |
98f85ff4 JH |
3357 | FILE *logfp; |
3358 | long pos; | |
3359 | int ret = 0, at_tail = 1; | |
2ff81662 | 3360 | |
7ae07c1b | 3361 | logfp = fopen(git_path("logs/%s", refname), "r"); |
2ff81662 | 3362 | if (!logfp) |
883d60fa | 3363 | return -1; |
101d15e0 | 3364 | |
98f85ff4 JH |
3365 | /* Jump to the end */ |
3366 | if (fseek(logfp, 0, SEEK_END) < 0) | |
3367 | return error("cannot seek back reflog for %s: %s", | |
3368 | refname, strerror(errno)); | |
3369 | pos = ftell(logfp); | |
3370 | while (!ret && 0 < pos) { | |
3371 | int cnt; | |
3372 | size_t nread; | |
3373 | char buf[BUFSIZ]; | |
3374 | char *endp, *scanp; | |
3375 | ||
3376 | /* Fill next block from the end */ | |
3377 | cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos; | |
3378 | if (fseek(logfp, pos - cnt, SEEK_SET)) | |
3379 | return error("cannot seek back reflog for %s: %s", | |
3380 | refname, strerror(errno)); | |
3381 | nread = fread(buf, cnt, 1, logfp); | |
e4ca819a | 3382 | if (nread != 1) |
98f85ff4 JH |
3383 | return error("cannot read %d bytes from reflog for %s: %s", |
3384 | cnt, refname, strerror(errno)); | |
3385 | pos -= cnt; | |
3386 | ||
3387 | scanp = endp = buf + cnt; | |
3388 | if (at_tail && scanp[-1] == '\n') | |
3389 | /* Looking at the final LF at the end of the file */ | |
3390 | scanp--; | |
3391 | at_tail = 0; | |
3392 | ||
3393 | while (buf < scanp) { | |
3394 | /* | |
3395 | * terminating LF of the previous line, or the beginning | |
3396 | * of the buffer. | |
3397 | */ | |
3398 | char *bp; | |
3399 | ||
3400 | bp = find_beginning_of_line(buf, scanp); | |
3401 | ||
e5e73ff2 | 3402 | if (*bp == '\n') { |
98f85ff4 | 3403 | /* |
e5e73ff2 JK |
3404 | * The newline is the end of the previous line, |
3405 | * so we know we have complete line starting | |
3406 | * at (bp + 1). Prefix it onto any prior data | |
3407 | * we collected for the line and process it. | |
98f85ff4 JH |
3408 | */ |
3409 | strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1)); | |
3410 | scanp = bp; | |
3411 | endp = bp + 1; | |
e5e73ff2 JK |
3412 | ret = show_one_reflog_ent(&sb, fn, cb_data); |
3413 | strbuf_reset(&sb); | |
3414 | if (ret) | |
3415 | break; | |
3416 | } else if (!pos) { | |
3417 | /* | |
3418 | * We are at the start of the buffer, and the | |
3419 | * start of the file; there is no previous | |
3420 | * line, and we have everything for this one. | |
3421 | * Process it, and we can end the loop. | |
3422 | */ | |
3423 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
3424 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
3425 | strbuf_reset(&sb); | |
3426 | break; | |
98f85ff4 | 3427 | } |
e5e73ff2 JK |
3428 | |
3429 | if (bp == buf) { | |
3430 | /* | |
3431 | * We are at the start of the buffer, and there | |
3432 | * is more file to read backwards. Which means | |
3433 | * we are in the middle of a line. Note that we | |
3434 | * may get here even if *bp was a newline; that | |
3435 | * just means we are at the exact end of the | |
3436 | * previous line, rather than some spot in the | |
3437 | * middle. | |
3438 | * | |
3439 | * Save away what we have to be combined with | |
3440 | * the data from the next read. | |
3441 | */ | |
3442 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
98f85ff4 | 3443 | break; |
e5e73ff2 | 3444 | } |
9d33f7c2 | 3445 | } |
101d15e0 | 3446 | |
2ff81662 | 3447 | } |
98f85ff4 | 3448 | if (!ret && sb.len) |
69216bf7 | 3449 | die("BUG: reverse reflog parser had leftover data"); |
98f85ff4 | 3450 | |
2ff81662 | 3451 | fclose(logfp); |
8ca78803 | 3452 | strbuf_release(&sb); |
2266bf27 | 3453 | return ret; |
2ff81662 | 3454 | } |
e29cb53a | 3455 | |
dfefa935 | 3456 | int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data) |
101d15e0 | 3457 | { |
98f85ff4 JH |
3458 | FILE *logfp; |
3459 | struct strbuf sb = STRBUF_INIT; | |
3460 | int ret = 0; | |
3461 | ||
3462 | logfp = fopen(git_path("logs/%s", refname), "r"); | |
3463 | if (!logfp) | |
3464 | return -1; | |
101d15e0 | 3465 | |
98f85ff4 JH |
3466 | while (!ret && !strbuf_getwholeline(&sb, logfp, '\n')) |
3467 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
3468 | fclose(logfp); | |
3469 | strbuf_release(&sb); | |
3470 | return ret; | |
3471 | } | |
989c0e5d MH |
3472 | /* |
3473 | * Call fn for each reflog in the namespace indicated by name. name | |
3474 | * must be empty or end with '/'. Name will be used as a scratch | |
3475 | * space, but its contents will be restored before return. | |
3476 | */ | |
3477 | static int do_for_each_reflog(struct strbuf *name, each_ref_fn fn, void *cb_data) | |
eb8381c8 | 3478 | { |
989c0e5d | 3479 | DIR *d = opendir(git_path("logs/%s", name->buf)); |
fcee5a14 | 3480 | int retval = 0; |
93c603fc | 3481 | struct dirent *de; |
989c0e5d | 3482 | int oldlen = name->len; |
eb8381c8 | 3483 | |
93c603fc | 3484 | if (!d) |
989c0e5d | 3485 | return name->len ? errno : 0; |
eb8381c8 | 3486 | |
93c603fc MH |
3487 | while ((de = readdir(d)) != NULL) { |
3488 | struct stat st; | |
eb8381c8 | 3489 | |
93c603fc MH |
3490 | if (de->d_name[0] == '.') |
3491 | continue; | |
2975c770 | 3492 | if (ends_with(de->d_name, ".lock")) |
93c603fc | 3493 | continue; |
989c0e5d MH |
3494 | strbuf_addstr(name, de->d_name); |
3495 | if (stat(git_path("logs/%s", name->buf), &st) < 0) { | |
3496 | ; /* silently ignore */ | |
93c603fc | 3497 | } else { |
eb8381c8 | 3498 | if (S_ISDIR(st.st_mode)) { |
989c0e5d MH |
3499 | strbuf_addch(name, '/'); |
3500 | retval = do_for_each_reflog(name, fn, cb_data); | |
eb8381c8 NP |
3501 | } else { |
3502 | unsigned char sha1[20]; | |
7695d118 | 3503 | if (read_ref_full(name->buf, 0, sha1, NULL)) |
989c0e5d | 3504 | retval = error("bad ref for %s", name->buf); |
eb8381c8 | 3505 | else |
989c0e5d | 3506 | retval = fn(name->buf, sha1, 0, cb_data); |
eb8381c8 NP |
3507 | } |
3508 | if (retval) | |
3509 | break; | |
3510 | } | |
989c0e5d | 3511 | strbuf_setlen(name, oldlen); |
eb8381c8 | 3512 | } |
93c603fc | 3513 | closedir(d); |
eb8381c8 NP |
3514 | return retval; |
3515 | } | |
3516 | ||
3517 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
3518 | { | |
989c0e5d MH |
3519 | int retval; |
3520 | struct strbuf name; | |
3521 | strbuf_init(&name, PATH_MAX); | |
3522 | retval = do_for_each_reflog(&name, fn, cb_data); | |
3523 | strbuf_release(&name); | |
3524 | return retval; | |
eb8381c8 | 3525 | } |
3d9f037c | 3526 | |
b5c8ea2a | 3527 | /** |
8df4e511 MH |
3528 | * Information needed for a single ref update. Set new_sha1 to the new |
3529 | * value or to null_sha1 to delete the ref. To check the old value | |
3530 | * while the ref is locked, set (flags & REF_HAVE_OLD) and set | |
3531 | * old_sha1 to the old value, or to null_sha1 to ensure the ref does | |
3532 | * not exist before update. | |
b5c8ea2a MH |
3533 | */ |
3534 | struct ref_update { | |
16180334 MH |
3535 | /* |
3536 | * If (flags & REF_HAVE_NEW), set the reference to this value: | |
3537 | */ | |
b5c8ea2a | 3538 | unsigned char new_sha1[20]; |
16180334 MH |
3539 | /* |
3540 | * If (flags & REF_HAVE_OLD), check that the reference | |
3541 | * previously had this value: | |
3542 | */ | |
b5c8ea2a | 3543 | unsigned char old_sha1[20]; |
8df4e511 | 3544 | /* |
16180334 | 3545 | * One or more of REF_HAVE_NEW, REF_HAVE_OLD, REF_NODEREF, |
8df4e511 MH |
3546 | * REF_DELETING, and REF_ISPRUNING: |
3547 | */ | |
3548 | unsigned int flags; | |
81c960e4 | 3549 | struct ref_lock *lock; |
84178db7 | 3550 | int type; |
db7516ab | 3551 | char *msg; |
88615910 | 3552 | const char refname[FLEX_ARRAY]; |
b5c8ea2a MH |
3553 | }; |
3554 | ||
2bdc785f RS |
3555 | /* |
3556 | * Transaction states. | |
3557 | * OPEN: The transaction is in a valid state and can accept new updates. | |
3558 | * An OPEN transaction can be committed. | |
3559 | * CLOSED: A closed transaction is no longer active and no other operations | |
3560 | * than free can be used on it in this state. | |
3561 | * A transaction can either become closed by successfully committing | |
3562 | * an active transaction or if there is a failure while building | |
3563 | * the transaction thus rendering it failed/inactive. | |
3564 | */ | |
3565 | enum ref_transaction_state { | |
3566 | REF_TRANSACTION_OPEN = 0, | |
3567 | REF_TRANSACTION_CLOSED = 1 | |
3568 | }; | |
3569 | ||
caa4046c MH |
3570 | /* |
3571 | * Data structure for holding a reference transaction, which can | |
3572 | * consist of checks and updates to multiple references, carried out | |
3573 | * as atomically as possible. This structure is opaque to callers. | |
3574 | */ | |
3575 | struct ref_transaction { | |
3576 | struct ref_update **updates; | |
3577 | size_t alloc; | |
3578 | size_t nr; | |
2bdc785f | 3579 | enum ref_transaction_state state; |
caa4046c MH |
3580 | }; |
3581 | ||
93a644ea | 3582 | struct ref_transaction *ref_transaction_begin(struct strbuf *err) |
caa4046c | 3583 | { |
5a603b04 JN |
3584 | assert(err); |
3585 | ||
caa4046c MH |
3586 | return xcalloc(1, sizeof(struct ref_transaction)); |
3587 | } | |
3588 | ||
026bd1d3 | 3589 | void ref_transaction_free(struct ref_transaction *transaction) |
caa4046c MH |
3590 | { |
3591 | int i; | |
3592 | ||
1b07255c RS |
3593 | if (!transaction) |
3594 | return; | |
3595 | ||
db7516ab RS |
3596 | for (i = 0; i < transaction->nr; i++) { |
3597 | free(transaction->updates[i]->msg); | |
88615910 | 3598 | free(transaction->updates[i]); |
db7516ab | 3599 | } |
caa4046c MH |
3600 | free(transaction->updates); |
3601 | free(transaction); | |
3602 | } | |
3603 | ||
caa4046c MH |
3604 | static struct ref_update *add_update(struct ref_transaction *transaction, |
3605 | const char *refname) | |
3606 | { | |
88615910 MH |
3607 | size_t len = strlen(refname); |
3608 | struct ref_update *update = xcalloc(1, sizeof(*update) + len + 1); | |
caa4046c | 3609 | |
88615910 | 3610 | strcpy((char *)update->refname, refname); |
caa4046c MH |
3611 | ALLOC_GROW(transaction->updates, transaction->nr + 1, transaction->alloc); |
3612 | transaction->updates[transaction->nr++] = update; | |
3613 | return update; | |
3614 | } | |
3615 | ||
8e34800e RS |
3616 | int ref_transaction_update(struct ref_transaction *transaction, |
3617 | const char *refname, | |
3618 | const unsigned char *new_sha1, | |
3619 | const unsigned char *old_sha1, | |
1d147bdf | 3620 | unsigned int flags, const char *msg, |
8e34800e | 3621 | struct strbuf *err) |
caa4046c | 3622 | { |
8e34800e | 3623 | struct ref_update *update; |
caa4046c | 3624 | |
5a603b04 JN |
3625 | assert(err); |
3626 | ||
2bdc785f RS |
3627 | if (transaction->state != REF_TRANSACTION_OPEN) |
3628 | die("BUG: update called for transaction that is not open"); | |
3629 | ||
16180334 | 3630 | if (new_sha1 && !is_null_sha1(new_sha1) && |
d0f810f0 RS |
3631 | check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) { |
3632 | strbuf_addf(err, "refusing to update ref with bad name %s", | |
3633 | refname); | |
3634 | return -1; | |
3635 | } | |
3636 | ||
8e34800e | 3637 | update = add_update(transaction, refname); |
16180334 MH |
3638 | if (new_sha1) { |
3639 | hashcpy(update->new_sha1, new_sha1); | |
3640 | flags |= REF_HAVE_NEW; | |
3641 | } | |
1d147bdf | 3642 | if (old_sha1) { |
caa4046c | 3643 | hashcpy(update->old_sha1, old_sha1); |
8df4e511 MH |
3644 | flags |= REF_HAVE_OLD; |
3645 | } | |
3646 | update->flags = flags; | |
db7516ab RS |
3647 | if (msg) |
3648 | update->msg = xstrdup(msg); | |
8e34800e | 3649 | return 0; |
caa4046c MH |
3650 | } |
3651 | ||
b416af5b RS |
3652 | int ref_transaction_create(struct ref_transaction *transaction, |
3653 | const char *refname, | |
3654 | const unsigned char *new_sha1, | |
fec14ec3 | 3655 | unsigned int flags, const char *msg, |
b416af5b | 3656 | struct strbuf *err) |
caa4046c | 3657 | { |
f04c5b55 MH |
3658 | if (!new_sha1 || is_null_sha1(new_sha1)) |
3659 | die("BUG: create called without valid new_sha1"); | |
bc9f2925 | 3660 | return ref_transaction_update(transaction, refname, new_sha1, |
1d147bdf | 3661 | null_sha1, flags, msg, err); |
caa4046c MH |
3662 | } |
3663 | ||
8c8bdc0d RS |
3664 | int ref_transaction_delete(struct ref_transaction *transaction, |
3665 | const char *refname, | |
3666 | const unsigned char *old_sha1, | |
fb5a6bb6 | 3667 | unsigned int flags, const char *msg, |
8c8bdc0d | 3668 | struct strbuf *err) |
caa4046c | 3669 | { |
60294596 MH |
3670 | if (old_sha1 && is_null_sha1(old_sha1)) |
3671 | die("BUG: delete called with old_sha1 set to zeros"); | |
1d147bdf | 3672 | return ref_transaction_update(transaction, refname, |
fb5a6bb6 | 3673 | null_sha1, old_sha1, |
1d147bdf | 3674 | flags, msg, err); |
caa4046c MH |
3675 | } |
3676 | ||
16180334 MH |
3677 | int ref_transaction_verify(struct ref_transaction *transaction, |
3678 | const char *refname, | |
3679 | const unsigned char *old_sha1, | |
3680 | unsigned int flags, | |
3681 | struct strbuf *err) | |
3682 | { | |
3683 | if (!old_sha1) | |
3684 | die("BUG: verify called with old_sha1 set to NULL"); | |
3685 | return ref_transaction_update(transaction, refname, | |
3686 | NULL, old_sha1, | |
3687 | flags, NULL, err); | |
3688 | } | |
3689 | ||
4b7b520b MH |
3690 | int update_ref(const char *msg, const char *refname, |
3691 | const unsigned char *new_sha1, const unsigned char *old_sha1, | |
fec14ec3 | 3692 | unsigned int flags, enum action_on_err onerr) |
4738a333 | 3693 | { |
b4d75ac1 RS |
3694 | struct ref_transaction *t; |
3695 | struct strbuf err = STRBUF_INIT; | |
3696 | ||
3697 | t = ref_transaction_begin(&err); | |
3698 | if (!t || | |
4b7b520b MH |
3699 | ref_transaction_update(t, refname, new_sha1, old_sha1, |
3700 | flags, msg, &err) || | |
db7516ab | 3701 | ref_transaction_commit(t, &err)) { |
b4d75ac1 RS |
3702 | const char *str = "update_ref failed for ref '%s': %s"; |
3703 | ||
3704 | ref_transaction_free(t); | |
3705 | switch (onerr) { | |
3706 | case UPDATE_REFS_MSG_ON_ERR: | |
3707 | error(str, refname, err.buf); | |
3708 | break; | |
3709 | case UPDATE_REFS_DIE_ON_ERR: | |
3710 | die(str, refname, err.buf); | |
3711 | break; | |
3712 | case UPDATE_REFS_QUIET_ON_ERR: | |
3713 | break; | |
3714 | } | |
3715 | strbuf_release(&err); | |
4738a333 | 3716 | return 1; |
b4d75ac1 RS |
3717 | } |
3718 | strbuf_release(&err); | |
3719 | ref_transaction_free(t); | |
3720 | return 0; | |
4738a333 BK |
3721 | } |
3722 | ||
07f9c881 | 3723 | static int ref_update_reject_duplicates(struct string_list *refnames, |
01319837 | 3724 | struct strbuf *err) |
98aee92d | 3725 | { |
07f9c881 | 3726 | int i, n = refnames->nr; |
5a603b04 JN |
3727 | |
3728 | assert(err); | |
3729 | ||
98aee92d | 3730 | for (i = 1; i < n; i++) |
07f9c881 | 3731 | if (!strcmp(refnames->items[i - 1].string, refnames->items[i].string)) { |
5a603b04 JN |
3732 | strbuf_addf(err, |
3733 | "Multiple updates for ref '%s' not allowed.", | |
07f9c881 | 3734 | refnames->items[i].string); |
98aee92d BK |
3735 | return 1; |
3736 | } | |
3737 | return 0; | |
3738 | } | |
3739 | ||
b5c8ea2a | 3740 | int ref_transaction_commit(struct ref_transaction *transaction, |
db7516ab | 3741 | struct strbuf *err) |
98aee92d | 3742 | { |
4a45b2f3 | 3743 | int ret = 0, i; |
b5c8ea2a | 3744 | int n = transaction->nr; |
6a402338 | 3745 | struct ref_update **updates = transaction->updates; |
4a45b2f3 MH |
3746 | struct string_list refs_to_delete = STRING_LIST_INIT_NODUP; |
3747 | struct string_list_item *ref_to_delete; | |
07f9c881 | 3748 | struct string_list affected_refnames = STRING_LIST_INIT_NODUP; |
98aee92d | 3749 | |
5a603b04 JN |
3750 | assert(err); |
3751 | ||
2bdc785f RS |
3752 | if (transaction->state != REF_TRANSACTION_OPEN) |
3753 | die("BUG: commit called for transaction that is not open"); | |
3754 | ||
3755 | if (!n) { | |
3756 | transaction->state = REF_TRANSACTION_CLOSED; | |
98aee92d | 3757 | return 0; |
2bdc785f | 3758 | } |
98aee92d | 3759 | |
07f9c881 MH |
3760 | /* Fail if a refname appears more than once in the transaction: */ |
3761 | for (i = 0; i < n; i++) | |
3762 | string_list_append(&affected_refnames, updates[i]->refname); | |
3763 | string_list_sort(&affected_refnames); | |
3764 | if (ref_update_reject_duplicates(&affected_refnames, err)) { | |
28e6a97e | 3765 | ret = TRANSACTION_GENERIC_ERROR; |
98aee92d | 3766 | goto cleanup; |
28e6a97e | 3767 | } |
98aee92d BK |
3768 | |
3769 | /* Acquire all locks while verifying old values */ | |
3770 | for (i = 0; i < n; i++) { | |
cb198d21 | 3771 | struct ref_update *update = updates[i]; |
fec14ec3 | 3772 | unsigned int flags = update->flags; |
cb198d21 | 3773 | |
16180334 | 3774 | if ((flags & REF_HAVE_NEW) && is_null_sha1(update->new_sha1)) |
62a2d525 | 3775 | flags |= REF_DELETING; |
8df4e511 MH |
3776 | update->lock = lock_ref_sha1_basic( |
3777 | update->refname, | |
3778 | ((update->flags & REF_HAVE_OLD) ? | |
3779 | update->old_sha1 : NULL), | |
3780 | NULL, | |
3781 | flags, | |
3782 | &update->type); | |
81c960e4 | 3783 | if (!update->lock) { |
28e6a97e RS |
3784 | ret = (errno == ENOTDIR) |
3785 | ? TRANSACTION_NAME_CONFLICT | |
3786 | : TRANSACTION_GENERIC_ERROR; | |
5a603b04 JN |
3787 | strbuf_addf(err, "Cannot lock the ref '%s'.", |
3788 | update->refname); | |
98aee92d BK |
3789 | goto cleanup; |
3790 | } | |
3791 | } | |
3792 | ||
3793 | /* Perform updates first so live commits remain referenced */ | |
cb198d21 MH |
3794 | for (i = 0; i < n; i++) { |
3795 | struct ref_update *update = updates[i]; | |
16180334 | 3796 | int flags = update->flags; |
cb198d21 | 3797 | |
16180334 | 3798 | if ((flags & REF_HAVE_NEW) && !is_null_sha1(update->new_sha1)) { |
5a6f4707 SB |
3799 | int overwriting_symref = ((update->type & REF_ISSYMREF) && |
3800 | (update->flags & REF_NODEREF)); | |
3801 | ||
3802 | if (!overwriting_symref | |
3803 | && !hashcmp(update->lock->old_sha1, update->new_sha1)) { | |
3804 | /* | |
3805 | * The reference already has the desired | |
3806 | * value, so we don't need to write it. | |
3807 | */ | |
706d5f81 MH |
3808 | unlock_ref(update->lock); |
3809 | update->lock = NULL; | |
3810 | } else if (write_ref_sha1(update->lock, update->new_sha1, | |
3811 | update->msg)) { | |
28e6a97e | 3812 | update->lock = NULL; /* freed by write_ref_sha1 */ |
5a603b04 JN |
3813 | strbuf_addf(err, "Cannot update the ref '%s'.", |
3814 | update->refname); | |
28e6a97e | 3815 | ret = TRANSACTION_GENERIC_ERROR; |
98aee92d | 3816 | goto cleanup; |
706d5f81 MH |
3817 | } else { |
3818 | /* freed by write_ref_sha1(): */ | |
3819 | update->lock = NULL; | |
04ad6223 | 3820 | } |
98aee92d | 3821 | } |
cb198d21 | 3822 | } |
98aee92d BK |
3823 | |
3824 | /* Perform deletes now that updates are safely completed */ | |
81c960e4 MH |
3825 | for (i = 0; i < n; i++) { |
3826 | struct ref_update *update = updates[i]; | |
16180334 | 3827 | int flags = update->flags; |
81c960e4 | 3828 | |
16180334 | 3829 | if ((flags & REF_HAVE_NEW) && is_null_sha1(update->new_sha1)) { |
65732845 | 3830 | if (delete_ref_loose(update->lock, update->type, err)) { |
28e6a97e | 3831 | ret = TRANSACTION_GENERIC_ERROR; |
65732845 JN |
3832 | goto cleanup; |
3833 | } | |
28e6a97e | 3834 | |
16180334 | 3835 | if (!(flags & REF_ISPRUNING)) |
4a45b2f3 MH |
3836 | string_list_append(&refs_to_delete, |
3837 | update->lock->ref_name); | |
98aee92d | 3838 | } |
81c960e4 MH |
3839 | } |
3840 | ||
4a45b2f3 | 3841 | if (repack_without_refs(&refs_to_delete, err)) { |
28e6a97e | 3842 | ret = TRANSACTION_GENERIC_ERROR; |
65732845 JN |
3843 | goto cleanup; |
3844 | } | |
4a45b2f3 MH |
3845 | for_each_string_list_item(ref_to_delete, &refs_to_delete) |
3846 | unlink_or_warn(git_path("logs/%s", ref_to_delete->string)); | |
98aee92d BK |
3847 | clear_loose_ref_cache(&ref_cache); |
3848 | ||
3849 | cleanup: | |
2bdc785f RS |
3850 | transaction->state = REF_TRANSACTION_CLOSED; |
3851 | ||
98aee92d | 3852 | for (i = 0; i < n; i++) |
81c960e4 MH |
3853 | if (updates[i]->lock) |
3854 | unlock_ref(updates[i]->lock); | |
4a45b2f3 | 3855 | string_list_clear(&refs_to_delete, 0); |
07f9c881 | 3856 | string_list_clear(&affected_refnames, 0); |
caa4046c MH |
3857 | return ret; |
3858 | } | |
3859 | ||
dfefa935 | 3860 | char *shorten_unambiguous_ref(const char *refname, int strict) |
7c2b3029 JK |
3861 | { |
3862 | int i; | |
3863 | static char **scanf_fmts; | |
3864 | static int nr_rules; | |
3865 | char *short_name; | |
3866 | ||
7c2b3029 | 3867 | if (!nr_rules) { |
4346663a MH |
3868 | /* |
3869 | * Pre-generate scanf formats from ref_rev_parse_rules[]. | |
3870 | * Generate a format suitable for scanf from a | |
3871 | * ref_rev_parse_rules rule by interpolating "%s" at the | |
3872 | * location of the "%.*s". | |
3873 | */ | |
7c2b3029 | 3874 | size_t total_len = 0; |
84d5633f | 3875 | size_t offset = 0; |
7c2b3029 JK |
3876 | |
3877 | /* the rule list is NULL terminated, count them first */ | |
a4165851 | 3878 | for (nr_rules = 0; ref_rev_parse_rules[nr_rules]; nr_rules++) |
7902fe03 MH |
3879 | /* -2 for strlen("%.*s") - strlen("%s"); +1 for NUL */ |
3880 | total_len += strlen(ref_rev_parse_rules[nr_rules]) - 2 + 1; | |
7c2b3029 JK |
3881 | |
3882 | scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len); | |
3883 | ||
84d5633f | 3884 | offset = 0; |
7c2b3029 | 3885 | for (i = 0; i < nr_rules; i++) { |
4346663a | 3886 | assert(offset < total_len); |
84d5633f | 3887 | scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] + offset; |
4346663a MH |
3888 | offset += snprintf(scanf_fmts[i], total_len - offset, |
3889 | ref_rev_parse_rules[i], 2, "%s") + 1; | |
7c2b3029 JK |
3890 | } |
3891 | } | |
3892 | ||
3893 | /* bail out if there are no rules */ | |
3894 | if (!nr_rules) | |
dfefa935 | 3895 | return xstrdup(refname); |
7c2b3029 | 3896 | |
dfefa935 MH |
3897 | /* buffer for scanf result, at most refname must fit */ |
3898 | short_name = xstrdup(refname); | |
7c2b3029 JK |
3899 | |
3900 | /* skip first rule, it will always match */ | |
3901 | for (i = nr_rules - 1; i > 0 ; --i) { | |
3902 | int j; | |
6e7b3309 | 3903 | int rules_to_fail = i; |
7c2b3029 JK |
3904 | int short_name_len; |
3905 | ||
dfefa935 | 3906 | if (1 != sscanf(refname, scanf_fmts[i], short_name)) |
7c2b3029 JK |
3907 | continue; |
3908 | ||
3909 | short_name_len = strlen(short_name); | |
3910 | ||
6e7b3309 BW |
3911 | /* |
3912 | * in strict mode, all (except the matched one) rules | |
3913 | * must fail to resolve to a valid non-ambiguous ref | |
3914 | */ | |
3915 | if (strict) | |
3916 | rules_to_fail = nr_rules; | |
3917 | ||
7c2b3029 JK |
3918 | /* |
3919 | * check if the short name resolves to a valid ref, | |
3920 | * but use only rules prior to the matched one | |
3921 | */ | |
6e7b3309 | 3922 | for (j = 0; j < rules_to_fail; j++) { |
7c2b3029 | 3923 | const char *rule = ref_rev_parse_rules[j]; |
7c2b3029 JK |
3924 | char refname[PATH_MAX]; |
3925 | ||
6e7b3309 BW |
3926 | /* skip matched rule */ |
3927 | if (i == j) | |
3928 | continue; | |
3929 | ||
7c2b3029 JK |
3930 | /* |
3931 | * the short name is ambiguous, if it resolves | |
3932 | * (with this previous rule) to a valid ref | |
3933 | * read_ref() returns 0 on success | |
3934 | */ | |
3935 | mksnpath(refname, sizeof(refname), | |
3936 | rule, short_name_len, short_name); | |
c6893323 | 3937 | if (ref_exists(refname)) |
7c2b3029 JK |
3938 | break; |
3939 | } | |
3940 | ||
3941 | /* | |
3942 | * short name is non-ambiguous if all previous rules | |
3943 | * haven't resolved to a valid ref | |
3944 | */ | |
6e7b3309 | 3945 | if (j == rules_to_fail) |
7c2b3029 JK |
3946 | return short_name; |
3947 | } | |
3948 | ||
3949 | free(short_name); | |
dfefa935 | 3950 | return xstrdup(refname); |
7c2b3029 | 3951 | } |
daebaa78 JH |
3952 | |
3953 | static struct string_list *hide_refs; | |
3954 | ||
3955 | int parse_hide_refs_config(const char *var, const char *value, const char *section) | |
3956 | { | |
3957 | if (!strcmp("transfer.hiderefs", var) || | |
3958 | /* NEEDSWORK: use parse_config_key() once both are merged */ | |
59556548 | 3959 | (starts_with(var, section) && var[strlen(section)] == '.' && |
daebaa78 JH |
3960 | !strcmp(var + strlen(section), ".hiderefs"))) { |
3961 | char *ref; | |
3962 | int len; | |
3963 | ||
3964 | if (!value) | |
3965 | return config_error_nonbool(var); | |
3966 | ref = xstrdup(value); | |
3967 | len = strlen(ref); | |
3968 | while (len && ref[len - 1] == '/') | |
3969 | ref[--len] = '\0'; | |
3970 | if (!hide_refs) { | |
3971 | hide_refs = xcalloc(1, sizeof(*hide_refs)); | |
3972 | hide_refs->strdup_strings = 1; | |
3973 | } | |
3974 | string_list_append(hide_refs, ref); | |
3975 | } | |
3976 | return 0; | |
3977 | } | |
3978 | ||
3979 | int ref_is_hidden(const char *refname) | |
3980 | { | |
3981 | struct string_list_item *item; | |
3982 | ||
3983 | if (!hide_refs) | |
3984 | return 0; | |
3985 | for_each_string_list_item(item, hide_refs) { | |
3986 | int len; | |
59556548 | 3987 | if (!starts_with(refname, item->string)) |
daebaa78 JH |
3988 | continue; |
3989 | len = strlen(item->string); | |
3990 | if (!refname[len] || refname[len] == '/') | |
3991 | return 1; | |
3992 | } | |
3993 | return 0; | |
3994 | } | |
fa5b1830 MH |
3995 | |
3996 | struct expire_reflog_cb { | |
3997 | unsigned int flags; | |
3998 | reflog_expiry_should_prune_fn *should_prune_fn; | |
3999 | void *policy_cb; | |
4000 | FILE *newlog; | |
4001 | unsigned char last_kept_sha1[20]; | |
4002 | }; | |
4003 | ||
4004 | static int expire_reflog_ent(unsigned char *osha1, unsigned char *nsha1, | |
4005 | const char *email, unsigned long timestamp, int tz, | |
4006 | const char *message, void *cb_data) | |
4007 | { | |
4008 | struct expire_reflog_cb *cb = cb_data; | |
4009 | struct expire_reflog_policy_cb *policy_cb = cb->policy_cb; | |
4010 | ||
4011 | if (cb->flags & EXPIRE_REFLOGS_REWRITE) | |
4012 | osha1 = cb->last_kept_sha1; | |
4013 | ||
4014 | if ((*cb->should_prune_fn)(osha1, nsha1, email, timestamp, tz, | |
4015 | message, policy_cb)) { | |
4016 | if (!cb->newlog) | |
4017 | printf("would prune %s", message); | |
4018 | else if (cb->flags & EXPIRE_REFLOGS_VERBOSE) | |
4019 | printf("prune %s", message); | |
4020 | } else { | |
4021 | if (cb->newlog) { | |
c653e034 | 4022 | fprintf(cb->newlog, "%s %s %s %lu %+05d\t%s", |
fa5b1830 | 4023 | sha1_to_hex(osha1), sha1_to_hex(nsha1), |
c653e034 | 4024 | email, timestamp, tz, message); |
fa5b1830 MH |
4025 | hashcpy(cb->last_kept_sha1, nsha1); |
4026 | } | |
4027 | if (cb->flags & EXPIRE_REFLOGS_VERBOSE) | |
4028 | printf("keep %s", message); | |
4029 | } | |
4030 | return 0; | |
4031 | } | |
4032 | ||
4033 | int reflog_expire(const char *refname, const unsigned char *sha1, | |
4034 | unsigned int flags, | |
4035 | reflog_expiry_prepare_fn prepare_fn, | |
4036 | reflog_expiry_should_prune_fn should_prune_fn, | |
4037 | reflog_expiry_cleanup_fn cleanup_fn, | |
4038 | void *policy_cb_data) | |
4039 | { | |
4040 | static struct lock_file reflog_lock; | |
4041 | struct expire_reflog_cb cb; | |
4042 | struct ref_lock *lock; | |
4043 | char *log_file; | |
4044 | int status = 0; | |
5e6f003c | 4045 | int type; |
fa5b1830 MH |
4046 | |
4047 | memset(&cb, 0, sizeof(cb)); | |
4048 | cb.flags = flags; | |
4049 | cb.policy_cb = policy_cb_data; | |
4050 | cb.should_prune_fn = should_prune_fn; | |
4051 | ||
4052 | /* | |
4053 | * The reflog file is locked by holding the lock on the | |
4054 | * reference itself, plus we might need to update the | |
4055 | * reference if --updateref was specified: | |
4056 | */ | |
5e6f003c | 4057 | lock = lock_ref_sha1_basic(refname, sha1, NULL, 0, &type); |
fa5b1830 MH |
4058 | if (!lock) |
4059 | return error("cannot lock ref '%s'", refname); | |
4060 | if (!reflog_exists(refname)) { | |
4061 | unlock_ref(lock); | |
4062 | return 0; | |
4063 | } | |
4064 | ||
4065 | log_file = git_pathdup("logs/%s", refname); | |
4066 | if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) { | |
4067 | /* | |
4068 | * Even though holding $GIT_DIR/logs/$reflog.lock has | |
4069 | * no locking implications, we use the lock_file | |
4070 | * machinery here anyway because it does a lot of the | |
4071 | * work we need, including cleaning up if the program | |
4072 | * exits unexpectedly. | |
4073 | */ | |
4074 | if (hold_lock_file_for_update(&reflog_lock, log_file, 0) < 0) { | |
4075 | struct strbuf err = STRBUF_INIT; | |
4076 | unable_to_lock_message(log_file, errno, &err); | |
4077 | error("%s", err.buf); | |
4078 | strbuf_release(&err); | |
4079 | goto failure; | |
4080 | } | |
4081 | cb.newlog = fdopen_lock_file(&reflog_lock, "w"); | |
4082 | if (!cb.newlog) { | |
4083 | error("cannot fdopen %s (%s)", | |
4084 | reflog_lock.filename.buf, strerror(errno)); | |
4085 | goto failure; | |
4086 | } | |
4087 | } | |
4088 | ||
4089 | (*prepare_fn)(refname, sha1, cb.policy_cb); | |
4090 | for_each_reflog_ent(refname, expire_reflog_ent, &cb); | |
4091 | (*cleanup_fn)(cb.policy_cb); | |
4092 | ||
4093 | if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) { | |
5e6f003c MH |
4094 | /* |
4095 | * It doesn't make sense to adjust a reference pointed | |
4096 | * to by a symbolic ref based on expiring entries in | |
423c688b MH |
4097 | * the symbolic reference's reflog. Nor can we update |
4098 | * a reference if there are no remaining reflog | |
4099 | * entries. | |
5e6f003c MH |
4100 | */ |
4101 | int update = (flags & EXPIRE_REFLOGS_UPDATE_REF) && | |
423c688b MH |
4102 | !(type & REF_ISSYMREF) && |
4103 | !is_null_sha1(cb.last_kept_sha1); | |
5e6f003c | 4104 | |
fa5b1830 MH |
4105 | if (close_lock_file(&reflog_lock)) { |
4106 | status |= error("couldn't write %s: %s", log_file, | |
4107 | strerror(errno)); | |
5e6f003c | 4108 | } else if (update && |
fa5b1830 MH |
4109 | (write_in_full(lock->lock_fd, |
4110 | sha1_to_hex(cb.last_kept_sha1), 40) != 40 || | |
4111 | write_str_in_full(lock->lock_fd, "\n") != 1 || | |
4112 | close_ref(lock) < 0)) { | |
4113 | status |= error("couldn't write %s", | |
4114 | lock->lk->filename.buf); | |
4115 | rollback_lock_file(&reflog_lock); | |
4116 | } else if (commit_lock_file(&reflog_lock)) { | |
4117 | status |= error("unable to commit reflog '%s' (%s)", | |
4118 | log_file, strerror(errno)); | |
5e6f003c | 4119 | } else if (update && commit_ref(lock)) { |
fa5b1830 MH |
4120 | status |= error("couldn't set %s", lock->ref_name); |
4121 | } | |
4122 | } | |
4123 | free(log_file); | |
4124 | unlock_ref(lock); | |
4125 | return status; | |
4126 | ||
4127 | failure: | |
4128 | rollback_lock_file(&reflog_lock); | |
4129 | free(log_file); | |
4130 | unlock_ref(lock); | |
4131 | return -1; | |
4132 | } |