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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 | |
bc5fd6d3 | 9 | /* |
dde8a902 DT |
10 | * How to handle various characters in refnames: |
11 | * 0: An acceptable character for refs | |
5e650228 JH |
12 | * 1: End-of-component |
13 | * 2: ., look for a preceding . to reject .. in refs | |
14 | * 3: {, look for a preceding @ to reject @{ in refs | |
15 | * 4: A bad character: ASCII control characters, "~", "^", ":" or SP | |
dde8a902 DT |
16 | */ |
17 | static unsigned char refname_disposition[256] = { | |
5e650228 JH |
18 | 1, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, |
19 | 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, | |
20 | 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 2, 1, | |
21 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 4, | |
dde8a902 | 22 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
5e650228 JH |
23 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 4, 0, 4, 0, |
24 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
25 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 4, 4 | |
dde8a902 DT |
26 | }; |
27 | ||
029cdb4a RS |
28 | /* |
29 | * Used as a flag to ref_transaction_delete when a loose ref is being | |
30 | * pruned. | |
31 | */ | |
32 | #define REF_ISPRUNING 0x0100 | |
dde8a902 DT |
33 | /* |
34 | * Try to read one refname component from the front of refname. | |
35 | * Return the length of the component found, or -1 if the component is | |
36 | * not legal. It is legal if it is something reasonable to have under | |
37 | * ".git/refs/"; We do not like it if: | |
bc5fd6d3 MH |
38 | * |
39 | * - any path component of it begins with ".", or | |
40 | * - it has double dots "..", or | |
41 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
5e650228 JH |
42 | * - it ends with a "/". |
43 | * - it ends with ".lock" | |
bc5fd6d3 MH |
44 | * - it contains a "\" (backslash) |
45 | */ | |
bc5fd6d3 MH |
46 | static int check_refname_component(const char *refname, int flags) |
47 | { | |
48 | const char *cp; | |
49 | char last = '\0'; | |
50 | ||
51 | for (cp = refname; ; cp++) { | |
dde8a902 DT |
52 | int ch = *cp & 255; |
53 | unsigned char disp = refname_disposition[ch]; | |
54 | switch (disp) { | |
5e650228 | 55 | case 1: |
dde8a902 | 56 | goto out; |
5e650228 | 57 | case 2: |
dde8a902 DT |
58 | if (last == '.') |
59 | return -1; /* Refname contains "..". */ | |
60 | break; | |
5e650228 | 61 | case 3: |
dde8a902 DT |
62 | if (last == '@') |
63 | return -1; /* Refname contains "@{". */ | |
bc5fd6d3 | 64 | break; |
5e650228 | 65 | case 4: |
dde8a902 DT |
66 | return -1; |
67 | } | |
bc5fd6d3 MH |
68 | last = ch; |
69 | } | |
dde8a902 | 70 | out: |
bc5fd6d3 | 71 | if (cp == refname) |
dac529e4 | 72 | return 0; /* Component has zero length. */ |
bc5fd6d3 MH |
73 | if (refname[0] == '.') { |
74 | if (!(flags & REFNAME_DOT_COMPONENT)) | |
75 | return -1; /* Component starts with '.'. */ | |
76 | /* | |
77 | * Even if leading dots are allowed, don't allow "." | |
78 | * as a component (".." is prevented by a rule above). | |
79 | */ | |
80 | if (refname[1] == '\0') | |
81 | return -1; /* Component equals ".". */ | |
82 | } | |
7108ad23 MH |
83 | if (cp - refname >= LOCK_SUFFIX_LEN && |
84 | !memcmp(cp - LOCK_SUFFIX_LEN, LOCK_SUFFIX, LOCK_SUFFIX_LEN)) | |
bc5fd6d3 MH |
85 | return -1; /* Refname ends with ".lock". */ |
86 | return cp - refname; | |
87 | } | |
88 | ||
5e650228 | 89 | int check_refname_format(const char *refname, int flags) |
bc5fd6d3 MH |
90 | { |
91 | int component_len, component_count = 0; | |
92 | ||
9ba89f48 FC |
93 | if (!strcmp(refname, "@")) |
94 | /* Refname is a single character '@'. */ | |
95 | return -1; | |
96 | ||
bc5fd6d3 MH |
97 | while (1) { |
98 | /* We are at the start of a path component. */ | |
99 | component_len = check_refname_component(refname, flags); | |
dac529e4 | 100 | if (component_len <= 0) { |
bc5fd6d3 MH |
101 | if ((flags & REFNAME_REFSPEC_PATTERN) && |
102 | refname[0] == '*' && | |
103 | (refname[1] == '\0' || refname[1] == '/')) { | |
104 | /* Accept one wildcard as a full refname component. */ | |
105 | flags &= ~REFNAME_REFSPEC_PATTERN; | |
106 | component_len = 1; | |
107 | } else { | |
108 | return -1; | |
109 | } | |
110 | } | |
111 | component_count++; | |
112 | if (refname[component_len] == '\0') | |
113 | break; | |
114 | /* Skip to next component. */ | |
115 | refname += component_len + 1; | |
116 | } | |
117 | ||
118 | if (refname[component_len - 1] == '.') | |
119 | return -1; /* Refname ends with '.'. */ | |
120 | if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2) | |
121 | return -1; /* Refname has only one component. */ | |
122 | return 0; | |
123 | } | |
124 | ||
125 | struct ref_entry; | |
e1e22e37 | 126 | |
28e6a34e MH |
127 | /* |
128 | * Information used (along with the information in ref_entry) to | |
129 | * describe a single cached reference. This data structure only | |
130 | * occurs embedded in a union in struct ref_entry, and only when | |
131 | * (ref_entry->flag & REF_DIR) is zero. | |
132 | */ | |
593f1bb8 | 133 | struct ref_value { |
6c6f58df MH |
134 | /* |
135 | * The name of the object to which this reference resolves | |
136 | * (which may be a tag object). If REF_ISBROKEN, this is | |
137 | * null. If REF_ISSYMREF, then this is the name of the object | |
138 | * referred to by the last reference in the symlink chain. | |
139 | */ | |
593f1bb8 | 140 | unsigned char sha1[20]; |
6c6f58df MH |
141 | |
142 | /* | |
143 | * If REF_KNOWS_PEELED, then this field holds the peeled value | |
144 | * of this reference, or null if the reference is known not to | |
2312a793 MH |
145 | * be peelable. See the documentation for peel_ref() for an |
146 | * exact definition of "peelable". | |
6c6f58df | 147 | */ |
593f1bb8 MH |
148 | unsigned char peeled[20]; |
149 | }; | |
150 | ||
f006c42a MH |
151 | struct ref_cache; |
152 | ||
28e6a34e MH |
153 | /* |
154 | * Information used (along with the information in ref_entry) to | |
155 | * describe a level in the hierarchy of references. This data | |
156 | * structure only occurs embedded in a union in struct ref_entry, and | |
157 | * only when (ref_entry.flag & REF_DIR) is set. In that case, | |
158 | * (ref_entry.flag & REF_INCOMPLETE) determines whether the references | |
159 | * in the directory have already been read: | |
160 | * | |
161 | * (ref_entry.flag & REF_INCOMPLETE) unset -- a directory of loose | |
162 | * or packed references, already read. | |
163 | * | |
164 | * (ref_entry.flag & REF_INCOMPLETE) set -- a directory of loose | |
165 | * references that hasn't been read yet (nor has any of its | |
166 | * subdirectories). | |
167 | * | |
168 | * Entries within a directory are stored within a growable array of | |
169 | * pointers to ref_entries (entries, nr, alloc). Entries 0 <= i < | |
170 | * sorted are sorted by their component name in strcmp() order and the | |
171 | * remaining entries are unsorted. | |
172 | * | |
173 | * Loose references are read lazily, one directory at a time. When a | |
174 | * directory of loose references is read, then all of the references | |
175 | * in that directory are stored, and REF_INCOMPLETE stubs are created | |
176 | * for any subdirectories, but the subdirectories themselves are not | |
177 | * read. The reading is triggered by get_ref_dir(). | |
178 | */ | |
d3177275 | 179 | struct ref_dir { |
e9c4c111 | 180 | int nr, alloc; |
e6ed3ca6 MH |
181 | |
182 | /* | |
183 | * Entries with index 0 <= i < sorted are sorted by name. New | |
184 | * entries are appended to the list unsorted, and are sorted | |
185 | * only when required; thus we avoid the need to sort the list | |
186 | * after the addition of every reference. | |
187 | */ | |
188 | int sorted; | |
189 | ||
f006c42a MH |
190 | /* A pointer to the ref_cache that contains this ref_dir. */ |
191 | struct ref_cache *ref_cache; | |
192 | ||
d3177275 | 193 | struct ref_entry **entries; |
e9c4c111 JP |
194 | }; |
195 | ||
89df9c84 MH |
196 | /* |
197 | * Bit values for ref_entry::flag. REF_ISSYMREF=0x01, | |
198 | * REF_ISPACKED=0x02, and REF_ISBROKEN=0x04 are public values; see | |
199 | * refs.h. | |
200 | */ | |
201 | ||
202 | /* | |
203 | * The field ref_entry->u.value.peeled of this value entry contains | |
204 | * the correct peeled value for the reference, which might be | |
205 | * null_sha1 if the reference is not a tag or if it is broken. | |
206 | */ | |
432ad41e | 207 | #define REF_KNOWS_PEELED 0x08 |
28e6a34e MH |
208 | |
209 | /* ref_entry represents a directory of references */ | |
432ad41e | 210 | #define REF_DIR 0x10 |
cf0adba7 | 211 | |
28e6a34e MH |
212 | /* |
213 | * Entry has not yet been read from disk (used only for REF_DIR | |
214 | * entries representing loose references) | |
215 | */ | |
216 | #define REF_INCOMPLETE 0x20 | |
217 | ||
432ad41e MH |
218 | /* |
219 | * A ref_entry represents either a reference or a "subdirectory" of | |
28e6a34e MH |
220 | * references. |
221 | * | |
222 | * Each directory in the reference namespace is represented by a | |
223 | * ref_entry with (flags & REF_DIR) set and containing a subdir member | |
224 | * that holds the entries in that directory that have been read so | |
225 | * far. If (flags & REF_INCOMPLETE) is set, then the directory and | |
226 | * its subdirectories haven't been read yet. REF_INCOMPLETE is only | |
227 | * used for loose reference directories. | |
228 | * | |
229 | * References are represented by a ref_entry with (flags & REF_DIR) | |
230 | * unset and a value member that describes the reference's value. The | |
231 | * flag member is at the ref_entry level, but it is also needed to | |
232 | * interpret the contents of the value field (in other words, a | |
233 | * ref_value object is not very much use without the enclosing | |
234 | * ref_entry). | |
432ad41e MH |
235 | * |
236 | * Reference names cannot end with slash and directories' names are | |
237 | * always stored with a trailing slash (except for the top-level | |
238 | * directory, which is always denoted by ""). This has two nice | |
239 | * consequences: (1) when the entries in each subdir are sorted | |
240 | * lexicographically by name (as they usually are), the references in | |
241 | * a whole tree can be generated in lexicographic order by traversing | |
242 | * the tree in left-to-right, depth-first order; (2) the names of | |
243 | * references and subdirectories cannot conflict, and therefore the | |
244 | * presence of an empty subdirectory does not block the creation of a | |
245 | * similarly-named reference. (The fact that reference names with the | |
246 | * same leading components can conflict *with each other* is a | |
247 | * separate issue that is regulated by is_refname_available().) | |
248 | * | |
249 | * Please note that the name field contains the fully-qualified | |
250 | * reference (or subdirectory) name. Space could be saved by only | |
251 | * storing the relative names. But that would require the full names | |
252 | * to be generated on the fly when iterating in do_for_each_ref(), and | |
253 | * would break callback functions, who have always been able to assume | |
254 | * that the name strings that they are passed will not be freed during | |
255 | * the iteration. | |
256 | */ | |
bc5fd6d3 MH |
257 | struct ref_entry { |
258 | unsigned char flag; /* ISSYMREF? ISPACKED? */ | |
593f1bb8 | 259 | union { |
432ad41e MH |
260 | struct ref_value value; /* if not (flags&REF_DIR) */ |
261 | struct ref_dir subdir; /* if (flags&REF_DIR) */ | |
593f1bb8 | 262 | } u; |
432ad41e MH |
263 | /* |
264 | * The full name of the reference (e.g., "refs/heads/master") | |
265 | * or the full name of the directory with a trailing slash | |
266 | * (e.g., "refs/heads/"): | |
267 | */ | |
bc5fd6d3 MH |
268 | char name[FLEX_ARRAY]; |
269 | }; | |
e1e22e37 | 270 | |
28e6a34e MH |
271 | static void read_loose_refs(const char *dirname, struct ref_dir *dir); |
272 | ||
d7826d54 MH |
273 | static struct ref_dir *get_ref_dir(struct ref_entry *entry) |
274 | { | |
28e6a34e | 275 | struct ref_dir *dir; |
d7826d54 | 276 | assert(entry->flag & REF_DIR); |
28e6a34e MH |
277 | dir = &entry->u.subdir; |
278 | if (entry->flag & REF_INCOMPLETE) { | |
279 | read_loose_refs(entry->name, dir); | |
280 | entry->flag &= ~REF_INCOMPLETE; | |
281 | } | |
282 | return dir; | |
d7826d54 MH |
283 | } |
284 | ||
cddc4258 MH |
285 | static struct ref_entry *create_ref_entry(const char *refname, |
286 | const unsigned char *sha1, int flag, | |
287 | int check_name) | |
e1e22e37 LT |
288 | { |
289 | int len; | |
cddc4258 | 290 | struct ref_entry *ref; |
e1e22e37 | 291 | |
09116a1c | 292 | if (check_name && |
dfefa935 MH |
293 | check_refname_format(refname, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT)) |
294 | die("Reference has invalid format: '%s'", refname); | |
cddc4258 MH |
295 | len = strlen(refname) + 1; |
296 | ref = xmalloc(sizeof(struct ref_entry) + len); | |
593f1bb8 MH |
297 | hashcpy(ref->u.value.sha1, sha1); |
298 | hashclr(ref->u.value.peeled); | |
cddc4258 MH |
299 | memcpy(ref->name, refname, len); |
300 | ref->flag = flag; | |
301 | return ref; | |
302 | } | |
303 | ||
432ad41e MH |
304 | static void clear_ref_dir(struct ref_dir *dir); |
305 | ||
732134ed MH |
306 | static void free_ref_entry(struct ref_entry *entry) |
307 | { | |
27b5587c MH |
308 | if (entry->flag & REF_DIR) { |
309 | /* | |
310 | * Do not use get_ref_dir() here, as that might | |
311 | * trigger the reading of loose refs. | |
312 | */ | |
313 | clear_ref_dir(&entry->u.subdir); | |
314 | } | |
732134ed MH |
315 | free(entry); |
316 | } | |
317 | ||
432ad41e MH |
318 | /* |
319 | * Add a ref_entry to the end of dir (unsorted). Entry is always | |
320 | * stored directly in dir; no recursion into subdirectories is | |
321 | * done. | |
322 | */ | |
323 | static void add_entry_to_dir(struct ref_dir *dir, struct ref_entry *entry) | |
cddc4258 | 324 | { |
432ad41e MH |
325 | ALLOC_GROW(dir->entries, dir->nr + 1, dir->alloc); |
326 | dir->entries[dir->nr++] = entry; | |
654ad400 MH |
327 | /* optimize for the case that entries are added in order */ |
328 | if (dir->nr == 1 || | |
329 | (dir->nr == dir->sorted + 1 && | |
330 | strcmp(dir->entries[dir->nr - 2]->name, | |
331 | dir->entries[dir->nr - 1]->name) < 0)) | |
332 | dir->sorted = dir->nr; | |
c774aab9 JP |
333 | } |
334 | ||
432ad41e MH |
335 | /* |
336 | * Clear and free all entries in dir, recursively. | |
337 | */ | |
d3177275 | 338 | static void clear_ref_dir(struct ref_dir *dir) |
bc5fd6d3 MH |
339 | { |
340 | int i; | |
d3177275 MH |
341 | for (i = 0; i < dir->nr; i++) |
342 | free_ref_entry(dir->entries[i]); | |
343 | free(dir->entries); | |
344 | dir->sorted = dir->nr = dir->alloc = 0; | |
345 | dir->entries = NULL; | |
bc5fd6d3 MH |
346 | } |
347 | ||
432ad41e MH |
348 | /* |
349 | * Create a struct ref_entry object for the specified dirname. | |
350 | * dirname is the name of the directory with a trailing slash (e.g., | |
351 | * "refs/heads/") or "" for the top-level directory. | |
352 | */ | |
f006c42a | 353 | static struct ref_entry *create_dir_entry(struct ref_cache *ref_cache, |
b9146f51 RS |
354 | const char *dirname, size_t len, |
355 | int incomplete) | |
432ad41e MH |
356 | { |
357 | struct ref_entry *direntry; | |
432ad41e | 358 | direntry = xcalloc(1, sizeof(struct ref_entry) + len + 1); |
b9146f51 RS |
359 | memcpy(direntry->name, dirname, len); |
360 | direntry->name[len] = '\0'; | |
f006c42a | 361 | direntry->u.subdir.ref_cache = ref_cache; |
28e6a34e | 362 | direntry->flag = REF_DIR | (incomplete ? REF_INCOMPLETE : 0); |
432ad41e MH |
363 | return direntry; |
364 | } | |
365 | ||
e9c4c111 | 366 | static int ref_entry_cmp(const void *a, const void *b) |
c774aab9 | 367 | { |
e9c4c111 JP |
368 | struct ref_entry *one = *(struct ref_entry **)a; |
369 | struct ref_entry *two = *(struct ref_entry **)b; | |
370 | return strcmp(one->name, two->name); | |
371 | } | |
c774aab9 | 372 | |
d3177275 | 373 | static void sort_ref_dir(struct ref_dir *dir); |
bc5fd6d3 | 374 | |
e1980c9d JH |
375 | struct string_slice { |
376 | size_t len; | |
377 | const char *str; | |
378 | }; | |
379 | ||
380 | static int ref_entry_cmp_sslice(const void *key_, const void *ent_) | |
381 | { | |
c971ddfd RS |
382 | const struct string_slice *key = key_; |
383 | const struct ref_entry *ent = *(const struct ref_entry * const *)ent_; | |
384 | int cmp = strncmp(key->str, ent->name, key->len); | |
e1980c9d JH |
385 | if (cmp) |
386 | return cmp; | |
c971ddfd | 387 | return '\0' - (unsigned char)ent->name[key->len]; |
e1980c9d JH |
388 | } |
389 | ||
432ad41e | 390 | /* |
9fc0a648 MH |
391 | * Return the index of the entry with the given refname from the |
392 | * ref_dir (non-recursively), sorting dir if necessary. Return -1 if | |
393 | * no such entry is found. dir must already be complete. | |
432ad41e | 394 | */ |
9fc0a648 | 395 | static int search_ref_dir(struct ref_dir *dir, const char *refname, size_t len) |
bc5fd6d3 | 396 | { |
e1980c9d JH |
397 | struct ref_entry **r; |
398 | struct string_slice key; | |
bc5fd6d3 | 399 | |
432ad41e | 400 | if (refname == NULL || !dir->nr) |
9fc0a648 | 401 | return -1; |
bc5fd6d3 | 402 | |
d3177275 | 403 | sort_ref_dir(dir); |
e1980c9d JH |
404 | key.len = len; |
405 | key.str = refname; | |
406 | r = bsearch(&key, dir->entries, dir->nr, sizeof(*dir->entries), | |
407 | ref_entry_cmp_sslice); | |
bc5fd6d3 MH |
408 | |
409 | if (r == NULL) | |
9fc0a648 | 410 | return -1; |
bc5fd6d3 | 411 | |
9fc0a648 | 412 | return r - dir->entries; |
bc5fd6d3 MH |
413 | } |
414 | ||
f348ac92 MH |
415 | /* |
416 | * Search for a directory entry directly within dir (without | |
417 | * recursing). Sort dir if necessary. subdirname must be a directory | |
418 | * name (i.e., end in '/'). If mkdir is set, then create the | |
419 | * directory if it is missing; otherwise, return NULL if the desired | |
28e6a34e | 420 | * directory cannot be found. dir must already be complete. |
f348ac92 | 421 | */ |
3f3aa1bc | 422 | static struct ref_dir *search_for_subdir(struct ref_dir *dir, |
dd02e728 RS |
423 | const char *subdirname, size_t len, |
424 | int mkdir) | |
f348ac92 | 425 | { |
9fc0a648 MH |
426 | int entry_index = search_ref_dir(dir, subdirname, len); |
427 | struct ref_entry *entry; | |
428 | if (entry_index == -1) { | |
f348ac92 MH |
429 | if (!mkdir) |
430 | return NULL; | |
28e6a34e MH |
431 | /* |
432 | * Since dir is complete, the absence of a subdir | |
433 | * means that the subdir really doesn't exist; | |
434 | * therefore, create an empty record for it but mark | |
435 | * the record complete. | |
436 | */ | |
b9146f51 | 437 | entry = create_dir_entry(dir->ref_cache, subdirname, len, 0); |
f348ac92 | 438 | add_entry_to_dir(dir, entry); |
9fc0a648 MH |
439 | } else { |
440 | entry = dir->entries[entry_index]; | |
f348ac92 | 441 | } |
3f3aa1bc | 442 | return get_ref_dir(entry); |
f348ac92 MH |
443 | } |
444 | ||
432ad41e MH |
445 | /* |
446 | * If refname is a reference name, find the ref_dir within the dir | |
447 | * tree that should hold refname. If refname is a directory name | |
448 | * (i.e., ends in '/'), then return that ref_dir itself. dir must | |
28e6a34e MH |
449 | * represent the top-level directory and must already be complete. |
450 | * Sort ref_dirs and recurse into subdirectories as necessary. If | |
451 | * mkdir is set, then create any missing directories; otherwise, | |
452 | * return NULL if the desired directory cannot be found. | |
432ad41e MH |
453 | */ |
454 | static struct ref_dir *find_containing_dir(struct ref_dir *dir, | |
455 | const char *refname, int mkdir) | |
456 | { | |
5fa04418 | 457 | const char *slash; |
5fa04418 | 458 | for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) { |
dd02e728 | 459 | size_t dirnamelen = slash - refname + 1; |
3f3aa1bc | 460 | struct ref_dir *subdir; |
dd02e728 | 461 | subdir = search_for_subdir(dir, refname, dirnamelen, mkdir); |
663c1295 JH |
462 | if (!subdir) { |
463 | dir = NULL; | |
f348ac92 | 464 | break; |
432ad41e | 465 | } |
3f3aa1bc | 466 | dir = subdir; |
432ad41e MH |
467 | } |
468 | ||
432ad41e MH |
469 | return dir; |
470 | } | |
471 | ||
472 | /* | |
473 | * Find the value entry with the given name in dir, sorting ref_dirs | |
474 | * and recursing into subdirectories as necessary. If the name is not | |
475 | * found or it corresponds to a directory entry, return NULL. | |
476 | */ | |
477 | static struct ref_entry *find_ref(struct ref_dir *dir, const char *refname) | |
478 | { | |
9fc0a648 | 479 | int entry_index; |
432ad41e MH |
480 | struct ref_entry *entry; |
481 | dir = find_containing_dir(dir, refname, 0); | |
482 | if (!dir) | |
483 | return NULL; | |
9fc0a648 MH |
484 | entry_index = search_ref_dir(dir, refname, strlen(refname)); |
485 | if (entry_index == -1) | |
486 | return NULL; | |
487 | entry = dir->entries[entry_index]; | |
488 | return (entry->flag & REF_DIR) ? NULL : entry; | |
432ad41e MH |
489 | } |
490 | ||
506a760d MH |
491 | /* |
492 | * Remove the entry with the given name from dir, recursing into | |
493 | * subdirectories as necessary. If refname is the name of a directory | |
494 | * (i.e., ends with '/'), then remove the directory and its contents. | |
495 | * If the removal was successful, return the number of entries | |
496 | * remaining in the directory entry that contained the deleted entry. | |
497 | * If the name was not found, return -1. Please note that this | |
498 | * function only deletes the entry from the cache; it does not delete | |
499 | * it from the filesystem or ensure that other cache entries (which | |
500 | * might be symbolic references to the removed entry) are updated. | |
501 | * Nor does it remove any containing dir entries that might be made | |
502 | * empty by the removal. dir must represent the top-level directory | |
503 | * and must already be complete. | |
504 | */ | |
505 | static int remove_entry(struct ref_dir *dir, const char *refname) | |
506 | { | |
507 | int refname_len = strlen(refname); | |
508 | int entry_index; | |
509 | struct ref_entry *entry; | |
510 | int is_dir = refname[refname_len - 1] == '/'; | |
511 | if (is_dir) { | |
512 | /* | |
513 | * refname represents a reference directory. Remove | |
514 | * the trailing slash; otherwise we will get the | |
515 | * directory *representing* refname rather than the | |
516 | * one *containing* it. | |
517 | */ | |
518 | char *dirname = xmemdupz(refname, refname_len - 1); | |
519 | dir = find_containing_dir(dir, dirname, 0); | |
520 | free(dirname); | |
521 | } else { | |
522 | dir = find_containing_dir(dir, refname, 0); | |
523 | } | |
524 | if (!dir) | |
525 | return -1; | |
526 | entry_index = search_ref_dir(dir, refname, refname_len); | |
527 | if (entry_index == -1) | |
528 | return -1; | |
529 | entry = dir->entries[entry_index]; | |
530 | ||
531 | memmove(&dir->entries[entry_index], | |
532 | &dir->entries[entry_index + 1], | |
533 | (dir->nr - entry_index - 1) * sizeof(*dir->entries) | |
534 | ); | |
535 | dir->nr--; | |
536 | if (dir->sorted > entry_index) | |
537 | dir->sorted--; | |
538 | free_ref_entry(entry); | |
539 | return dir->nr; | |
432ad41e MH |
540 | } |
541 | ||
542 | /* | |
543 | * Add a ref_entry to the ref_dir (unsorted), recursing into | |
544 | * subdirectories as necessary. dir must represent the top-level | |
545 | * directory. Return 0 on success. | |
546 | */ | |
547 | static int add_ref(struct ref_dir *dir, struct ref_entry *ref) | |
548 | { | |
549 | dir = find_containing_dir(dir, ref->name, 1); | |
550 | if (!dir) | |
551 | return -1; | |
552 | add_entry_to_dir(dir, ref); | |
553 | return 0; | |
554 | } | |
555 | ||
202a56a9 MH |
556 | /* |
557 | * Emit a warning and return true iff ref1 and ref2 have the same name | |
558 | * and the same sha1. Die if they have the same name but different | |
559 | * sha1s. | |
560 | */ | |
561 | static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2) | |
562 | { | |
432ad41e | 563 | if (strcmp(ref1->name, ref2->name)) |
202a56a9 | 564 | return 0; |
432ad41e MH |
565 | |
566 | /* Duplicate name; make sure that they don't conflict: */ | |
567 | ||
568 | if ((ref1->flag & REF_DIR) || (ref2->flag & REF_DIR)) | |
569 | /* This is impossible by construction */ | |
570 | die("Reference directory conflict: %s", ref1->name); | |
571 | ||
572 | if (hashcmp(ref1->u.value.sha1, ref2->u.value.sha1)) | |
573 | die("Duplicated ref, and SHA1s don't match: %s", ref1->name); | |
574 | ||
575 | warning("Duplicated ref: %s", ref1->name); | |
576 | return 1; | |
202a56a9 MH |
577 | } |
578 | ||
e6ed3ca6 | 579 | /* |
432ad41e MH |
580 | * Sort the entries in dir non-recursively (if they are not already |
581 | * sorted) and remove any duplicate entries. | |
e6ed3ca6 | 582 | */ |
d3177275 | 583 | static void sort_ref_dir(struct ref_dir *dir) |
e9c4c111 | 584 | { |
202a56a9 | 585 | int i, j; |
81a79d8e | 586 | struct ref_entry *last = NULL; |
c774aab9 | 587 | |
e6ed3ca6 MH |
588 | /* |
589 | * This check also prevents passing a zero-length array to qsort(), | |
590 | * which is a problem on some platforms. | |
591 | */ | |
d3177275 | 592 | if (dir->sorted == dir->nr) |
e9c4c111 | 593 | return; |
c774aab9 | 594 | |
d3177275 | 595 | qsort(dir->entries, dir->nr, sizeof(*dir->entries), ref_entry_cmp); |
c774aab9 | 596 | |
81a79d8e MH |
597 | /* Remove any duplicates: */ |
598 | for (i = 0, j = 0; j < dir->nr; j++) { | |
599 | struct ref_entry *entry = dir->entries[j]; | |
600 | if (last && is_dup_ref(last, entry)) | |
601 | free_ref_entry(entry); | |
602 | else | |
603 | last = dir->entries[i++] = entry; | |
e9c4c111 | 604 | } |
81a79d8e | 605 | dir->sorted = dir->nr = i; |
e9c4c111 | 606 | } |
c774aab9 | 607 | |
fcce1703 MH |
608 | /* Include broken references in a do_for_each_ref*() iteration: */ |
609 | #define DO_FOR_EACH_INCLUDE_BROKEN 0x01 | |
c774aab9 | 610 | |
662428f4 MH |
611 | /* |
612 | * Return true iff the reference described by entry can be resolved to | |
613 | * an object in the database. Emit a warning if the referred-to | |
614 | * object does not exist. | |
615 | */ | |
616 | static int ref_resolves_to_object(struct ref_entry *entry) | |
617 | { | |
618 | if (entry->flag & REF_ISBROKEN) | |
619 | return 0; | |
620 | if (!has_sha1_file(entry->u.value.sha1)) { | |
621 | error("%s does not point to a valid object!", entry->name); | |
622 | return 0; | |
623 | } | |
624 | return 1; | |
625 | } | |
c774aab9 | 626 | |
7d76fdc8 MH |
627 | /* |
628 | * current_ref is a performance hack: when iterating over references | |
629 | * using the for_each_ref*() functions, current_ref is set to the | |
630 | * current reference's entry before calling the callback function. If | |
631 | * the callback function calls peel_ref(), then peel_ref() first | |
632 | * checks whether the reference to be peeled is the current reference | |
633 | * (it usually is) and if so, returns that reference's peeled version | |
634 | * if it is available. This avoids a refname lookup in a common case. | |
635 | */ | |
bc5fd6d3 | 636 | static struct ref_entry *current_ref; |
c774aab9 | 637 | |
624cac35 MH |
638 | typedef int each_ref_entry_fn(struct ref_entry *entry, void *cb_data); |
639 | ||
640 | struct ref_entry_cb { | |
641 | const char *base; | |
642 | int trim; | |
643 | int flags; | |
644 | each_ref_fn *fn; | |
645 | void *cb_data; | |
646 | }; | |
647 | ||
fcce1703 | 648 | /* |
624cac35 MH |
649 | * Handle one reference in a do_for_each_ref*()-style iteration, |
650 | * calling an each_ref_fn for each entry. | |
fcce1703 | 651 | */ |
624cac35 | 652 | static int do_one_ref(struct ref_entry *entry, void *cb_data) |
bc5fd6d3 | 653 | { |
624cac35 | 654 | struct ref_entry_cb *data = cb_data; |
d0cf51e9 | 655 | struct ref_entry *old_current_ref; |
429213e4 | 656 | int retval; |
d0cf51e9 | 657 | |
59556548 | 658 | if (!starts_with(entry->name, data->base)) |
bc5fd6d3 | 659 | return 0; |
c774aab9 | 660 | |
624cac35 | 661 | if (!(data->flags & DO_FOR_EACH_INCLUDE_BROKEN) && |
662428f4 | 662 | !ref_resolves_to_object(entry)) |
bc5fd6d3 | 663 | return 0; |
c774aab9 | 664 | |
d0cf51e9 MH |
665 | /* Store the old value, in case this is a recursive call: */ |
666 | old_current_ref = current_ref; | |
bc5fd6d3 | 667 | current_ref = entry; |
624cac35 MH |
668 | retval = data->fn(entry->name + data->trim, entry->u.value.sha1, |
669 | entry->flag, data->cb_data); | |
d0cf51e9 | 670 | current_ref = old_current_ref; |
429213e4 | 671 | return retval; |
bc5fd6d3 | 672 | } |
c774aab9 | 673 | |
c36b5bc2 | 674 | /* |
d3177275 | 675 | * Call fn for each reference in dir that has index in the range |
432ad41e MH |
676 | * offset <= index < dir->nr. Recurse into subdirectories that are in |
677 | * that index range, sorting them before iterating. This function | |
624cac35 MH |
678 | * does not sort dir itself; it should be sorted beforehand. fn is |
679 | * called for all references, including broken ones. | |
c36b5bc2 | 680 | */ |
624cac35 MH |
681 | static int do_for_each_entry_in_dir(struct ref_dir *dir, int offset, |
682 | each_ref_entry_fn fn, void *cb_data) | |
c36b5bc2 MH |
683 | { |
684 | int i; | |
d3177275 MH |
685 | assert(dir->sorted == dir->nr); |
686 | for (i = offset; i < dir->nr; i++) { | |
432ad41e MH |
687 | struct ref_entry *entry = dir->entries[i]; |
688 | int retval; | |
689 | if (entry->flag & REF_DIR) { | |
d7826d54 MH |
690 | struct ref_dir *subdir = get_ref_dir(entry); |
691 | sort_ref_dir(subdir); | |
624cac35 | 692 | retval = do_for_each_entry_in_dir(subdir, 0, fn, cb_data); |
432ad41e | 693 | } else { |
624cac35 | 694 | retval = fn(entry, cb_data); |
432ad41e | 695 | } |
c36b5bc2 MH |
696 | if (retval) |
697 | return retval; | |
698 | } | |
699 | return 0; | |
700 | } | |
701 | ||
b3fd060f | 702 | /* |
d3177275 | 703 | * Call fn for each reference in the union of dir1 and dir2, in order |
432ad41e MH |
704 | * by refname. Recurse into subdirectories. If a value entry appears |
705 | * in both dir1 and dir2, then only process the version that is in | |
706 | * dir2. The input dirs must already be sorted, but subdirs will be | |
624cac35 MH |
707 | * sorted as needed. fn is called for all references, including |
708 | * broken ones. | |
b3fd060f | 709 | */ |
624cac35 MH |
710 | static int do_for_each_entry_in_dirs(struct ref_dir *dir1, |
711 | struct ref_dir *dir2, | |
712 | each_ref_entry_fn fn, void *cb_data) | |
b3fd060f MH |
713 | { |
714 | int retval; | |
715 | int i1 = 0, i2 = 0; | |
716 | ||
d3177275 MH |
717 | assert(dir1->sorted == dir1->nr); |
718 | assert(dir2->sorted == dir2->nr); | |
432ad41e MH |
719 | while (1) { |
720 | struct ref_entry *e1, *e2; | |
721 | int cmp; | |
722 | if (i1 == dir1->nr) { | |
624cac35 | 723 | return do_for_each_entry_in_dir(dir2, i2, fn, cb_data); |
432ad41e MH |
724 | } |
725 | if (i2 == dir2->nr) { | |
624cac35 | 726 | return do_for_each_entry_in_dir(dir1, i1, fn, cb_data); |
432ad41e MH |
727 | } |
728 | e1 = dir1->entries[i1]; | |
729 | e2 = dir2->entries[i2]; | |
730 | cmp = strcmp(e1->name, e2->name); | |
731 | if (cmp == 0) { | |
732 | if ((e1->flag & REF_DIR) && (e2->flag & REF_DIR)) { | |
733 | /* Both are directories; descend them in parallel. */ | |
d7826d54 MH |
734 | struct ref_dir *subdir1 = get_ref_dir(e1); |
735 | struct ref_dir *subdir2 = get_ref_dir(e2); | |
736 | sort_ref_dir(subdir1); | |
737 | sort_ref_dir(subdir2); | |
624cac35 MH |
738 | retval = do_for_each_entry_in_dirs( |
739 | subdir1, subdir2, fn, cb_data); | |
432ad41e MH |
740 | i1++; |
741 | i2++; | |
742 | } else if (!(e1->flag & REF_DIR) && !(e2->flag & REF_DIR)) { | |
743 | /* Both are references; ignore the one from dir1. */ | |
624cac35 | 744 | retval = fn(e2, cb_data); |
432ad41e MH |
745 | i1++; |
746 | i2++; | |
747 | } else { | |
748 | die("conflict between reference and directory: %s", | |
749 | e1->name); | |
750 | } | |
b3fd060f | 751 | } else { |
432ad41e MH |
752 | struct ref_entry *e; |
753 | if (cmp < 0) { | |
754 | e = e1; | |
b3fd060f | 755 | i1++; |
432ad41e MH |
756 | } else { |
757 | e = e2; | |
758 | i2++; | |
759 | } | |
760 | if (e->flag & REF_DIR) { | |
d7826d54 MH |
761 | struct ref_dir *subdir = get_ref_dir(e); |
762 | sort_ref_dir(subdir); | |
624cac35 MH |
763 | retval = do_for_each_entry_in_dir( |
764 | subdir, 0, fn, cb_data); | |
432ad41e | 765 | } else { |
624cac35 | 766 | retval = fn(e, cb_data); |
b3fd060f MH |
767 | } |
768 | } | |
769 | if (retval) | |
770 | return retval; | |
771 | } | |
b3fd060f MH |
772 | } |
773 | ||
98eeb09e JK |
774 | /* |
775 | * Load all of the refs from the dir into our in-memory cache. The hard work | |
776 | * of loading loose refs is done by get_ref_dir(), so we just need to recurse | |
777 | * through all of the sub-directories. We do not even need to care about | |
778 | * sorting, as traversal order does not matter to us. | |
779 | */ | |
780 | static void prime_ref_dir(struct ref_dir *dir) | |
781 | { | |
782 | int i; | |
783 | for (i = 0; i < dir->nr; i++) { | |
784 | struct ref_entry *entry = dir->entries[i]; | |
785 | if (entry->flag & REF_DIR) | |
786 | prime_ref_dir(get_ref_dir(entry)); | |
787 | } | |
788 | } | |
cbe73331 JK |
789 | |
790 | static int entry_matches(struct ref_entry *entry, const char *refname) | |
d66da478 | 791 | { |
cbe73331 | 792 | return refname && !strcmp(entry->name, refname); |
5a4d4947 MH |
793 | } |
794 | ||
cbe73331 JK |
795 | struct nonmatching_ref_data { |
796 | const char *skip; | |
797 | struct ref_entry *found; | |
5a4d4947 MH |
798 | }; |
799 | ||
cbe73331 | 800 | static int nonmatching_ref_fn(struct ref_entry *entry, void *vdata) |
5a4d4947 | 801 | { |
cbe73331 JK |
802 | struct nonmatching_ref_data *data = vdata; |
803 | ||
804 | if (entry_matches(entry, data->skip)) | |
5a4d4947 | 805 | return 0; |
cbe73331 JK |
806 | |
807 | data->found = entry; | |
808 | return 1; | |
809 | } | |
810 | ||
811 | static void report_refname_conflict(struct ref_entry *entry, | |
812 | const char *refname) | |
813 | { | |
814 | error("'%s' exists; cannot create '%s'", entry->name, refname); | |
d66da478 MH |
815 | } |
816 | ||
bc5fd6d3 MH |
817 | /* |
818 | * Return true iff a reference named refname could be created without | |
624cac35 | 819 | * conflicting with the name of an existing reference in dir. If |
5a4d4947 MH |
820 | * oldrefname is non-NULL, ignore potential conflicts with oldrefname |
821 | * (e.g., because oldrefname is scheduled for deletion in the same | |
bc5fd6d3 | 822 | * operation). |
cbe73331 JK |
823 | * |
824 | * Two reference names conflict if one of them exactly matches the | |
825 | * leading components of the other; e.g., "foo/bar" conflicts with | |
826 | * both "foo" and with "foo/bar/baz" but not with "foo/bar" or | |
827 | * "foo/barbados". | |
bc5fd6d3 MH |
828 | */ |
829 | static int is_refname_available(const char *refname, const char *oldrefname, | |
d3177275 | 830 | struct ref_dir *dir) |
bc5fd6d3 | 831 | { |
cbe73331 JK |
832 | const char *slash; |
833 | size_t len; | |
834 | int pos; | |
835 | char *dirname; | |
5a4d4947 | 836 | |
cbe73331 JK |
837 | for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) { |
838 | /* | |
839 | * We are still at a leading dir of the refname; we are | |
840 | * looking for a conflict with a leaf entry. | |
841 | * | |
842 | * If we find one, we still must make sure it is | |
843 | * not "oldrefname". | |
844 | */ | |
845 | pos = search_ref_dir(dir, refname, slash - refname); | |
846 | if (pos >= 0) { | |
847 | struct ref_entry *entry = dir->entries[pos]; | |
848 | if (entry_matches(entry, oldrefname)) | |
849 | return 1; | |
850 | report_refname_conflict(entry, refname); | |
851 | return 0; | |
852 | } | |
853 | ||
854 | ||
855 | /* | |
856 | * Otherwise, we can try to continue our search with | |
857 | * the next component; if we come up empty, we know | |
858 | * there is nothing under this whole prefix. | |
859 | */ | |
860 | pos = search_ref_dir(dir, refname, slash + 1 - refname); | |
861 | if (pos < 0) | |
862 | return 1; | |
863 | ||
864 | dir = get_ref_dir(dir->entries[pos]); | |
865 | } | |
866 | ||
867 | /* | |
868 | * We are at the leaf of our refname; we want to | |
869 | * make sure there are no directories which match it. | |
870 | */ | |
871 | len = strlen(refname); | |
872 | dirname = xmallocz(len + 1); | |
873 | sprintf(dirname, "%s/", refname); | |
874 | pos = search_ref_dir(dir, dirname, len + 1); | |
875 | free(dirname); | |
876 | ||
877 | if (pos >= 0) { | |
878 | /* | |
879 | * We found a directory named "refname". It is a | |
880 | * problem iff it contains any ref that is not | |
881 | * "oldrefname". | |
882 | */ | |
883 | struct ref_entry *entry = dir->entries[pos]; | |
884 | struct ref_dir *dir = get_ref_dir(entry); | |
885 | struct nonmatching_ref_data data; | |
886 | ||
887 | data.skip = oldrefname; | |
888 | sort_ref_dir(dir); | |
889 | if (!do_for_each_entry_in_dir(dir, 0, nonmatching_ref_fn, &data)) | |
890 | return 1; | |
891 | ||
892 | report_refname_conflict(data.found, refname); | |
5a4d4947 | 893 | return 0; |
bc5fd6d3 | 894 | } |
cbe73331 JK |
895 | |
896 | /* | |
897 | * There is no point in searching for another leaf | |
898 | * node which matches it; such an entry would be the | |
899 | * ref we are looking for, not a conflict. | |
900 | */ | |
bc5fd6d3 | 901 | return 1; |
e1e22e37 LT |
902 | } |
903 | ||
2fff7812 MH |
904 | struct packed_ref_cache { |
905 | struct ref_entry *root; | |
9f69d297 | 906 | |
5f5e2a88 MH |
907 | /* |
908 | * Count of references to the data structure in this instance, | |
909 | * including the pointer from ref_cache::packed if any. The | |
910 | * data will not be freed as long as the reference count is | |
911 | * nonzero. | |
912 | */ | |
913 | unsigned int referrers; | |
914 | ||
9f69d297 MH |
915 | /* |
916 | * Iff the packed-refs file associated with this instance is | |
917 | * currently locked for writing, this points at the associated | |
4f6b83e3 MH |
918 | * lock (which is owned by somebody else). The referrer count |
919 | * is also incremented when the file is locked and decremented | |
920 | * when it is unlocked. | |
9f69d297 MH |
921 | */ |
922 | struct lock_file *lock; | |
ca919930 JK |
923 | |
924 | /* The metadata from when this packed-refs cache was read */ | |
925 | struct stat_validity validity; | |
2fff7812 MH |
926 | }; |
927 | ||
5e290ff7 JH |
928 | /* |
929 | * Future: need to be in "struct repository" | |
930 | * when doing a full libification. | |
931 | */ | |
79c7ca54 MH |
932 | static struct ref_cache { |
933 | struct ref_cache *next; | |
d12229f5 | 934 | struct ref_entry *loose; |
2fff7812 | 935 | struct packed_ref_cache *packed; |
9da31cb0 MH |
936 | /* |
937 | * The submodule name, or "" for the main repo. We allocate | |
938 | * length 1 rather than FLEX_ARRAY so that the main ref_cache | |
939 | * is initialized correctly. | |
940 | */ | |
941 | char name[1]; | |
942 | } ref_cache, *submodule_ref_caches; | |
0e88c130 | 943 | |
9f69d297 MH |
944 | /* Lock used for the main packed-refs file: */ |
945 | static struct lock_file packlock; | |
946 | ||
5f5e2a88 MH |
947 | /* |
948 | * Increment the reference count of *packed_refs. | |
949 | */ | |
950 | static void acquire_packed_ref_cache(struct packed_ref_cache *packed_refs) | |
951 | { | |
952 | packed_refs->referrers++; | |
953 | } | |
954 | ||
955 | /* | |
956 | * Decrease the reference count of *packed_refs. If it goes to zero, | |
957 | * free *packed_refs and return true; otherwise return false. | |
958 | */ | |
959 | static int release_packed_ref_cache(struct packed_ref_cache *packed_refs) | |
960 | { | |
961 | if (!--packed_refs->referrers) { | |
962 | free_ref_entry(packed_refs->root); | |
ca919930 | 963 | stat_validity_clear(&packed_refs->validity); |
5f5e2a88 MH |
964 | free(packed_refs); |
965 | return 1; | |
966 | } else { | |
967 | return 0; | |
968 | } | |
969 | } | |
970 | ||
760c4512 | 971 | static void clear_packed_ref_cache(struct ref_cache *refs) |
e1e22e37 | 972 | { |
d12229f5 | 973 | if (refs->packed) { |
5f5e2a88 MH |
974 | struct packed_ref_cache *packed_refs = refs->packed; |
975 | ||
976 | if (packed_refs->lock) | |
9f69d297 | 977 | die("internal error: packed-ref cache cleared while locked"); |
d12229f5 | 978 | refs->packed = NULL; |
5f5e2a88 | 979 | release_packed_ref_cache(packed_refs); |
d12229f5 | 980 | } |
5e290ff7 | 981 | } |
e1e22e37 | 982 | |
760c4512 MH |
983 | static void clear_loose_ref_cache(struct ref_cache *refs) |
984 | { | |
d12229f5 MH |
985 | if (refs->loose) { |
986 | free_ref_entry(refs->loose); | |
987 | refs->loose = NULL; | |
988 | } | |
760c4512 MH |
989 | } |
990 | ||
79c7ca54 | 991 | static struct ref_cache *create_ref_cache(const char *submodule) |
e5dbf605 | 992 | { |
ce40979c | 993 | int len; |
79c7ca54 | 994 | struct ref_cache *refs; |
ce40979c MH |
995 | if (!submodule) |
996 | submodule = ""; | |
997 | len = strlen(submodule) + 1; | |
79c7ca54 | 998 | refs = xcalloc(1, sizeof(struct ref_cache) + len); |
ce40979c | 999 | memcpy(refs->name, submodule, len); |
e5dbf605 MH |
1000 | return refs; |
1001 | } | |
1002 | ||
4349a668 | 1003 | /* |
79c7ca54 | 1004 | * Return a pointer to a ref_cache for the specified submodule. For |
4349a668 MH |
1005 | * the main repository, use submodule==NULL. The returned structure |
1006 | * will be allocated and initialized but not necessarily populated; it | |
1007 | * should not be freed. | |
1008 | */ | |
79c7ca54 | 1009 | static struct ref_cache *get_ref_cache(const char *submodule) |
4349a668 | 1010 | { |
9da31cb0 MH |
1011 | struct ref_cache *refs; |
1012 | ||
1013 | if (!submodule || !*submodule) | |
1014 | return &ref_cache; | |
1015 | ||
1016 | for (refs = submodule_ref_caches; refs; refs = refs->next) | |
0e88c130 MH |
1017 | if (!strcmp(submodule, refs->name)) |
1018 | return refs; | |
0e88c130 | 1019 | |
79c7ca54 | 1020 | refs = create_ref_cache(submodule); |
9da31cb0 MH |
1021 | refs->next = submodule_ref_caches; |
1022 | submodule_ref_caches = refs; | |
0e88c130 | 1023 | return refs; |
4349a668 MH |
1024 | } |
1025 | ||
3feb4f0c MH |
1026 | /* The length of a peeled reference line in packed-refs, including EOL: */ |
1027 | #define PEELED_LINE_LENGTH 42 | |
1028 | ||
694b7a19 MH |
1029 | /* |
1030 | * The packed-refs header line that we write out. Perhaps other | |
1031 | * traits will be added later. The trailing space is required. | |
1032 | */ | |
1033 | static const char PACKED_REFS_HEADER[] = | |
1034 | "# pack-refs with: peeled fully-peeled \n"; | |
1035 | ||
bc5fd6d3 MH |
1036 | /* |
1037 | * Parse one line from a packed-refs file. Write the SHA1 to sha1. | |
1038 | * Return a pointer to the refname within the line (null-terminated), | |
1039 | * or NULL if there was a problem. | |
1040 | */ | |
1041 | static const char *parse_ref_line(char *line, unsigned char *sha1) | |
1042 | { | |
1043 | /* | |
1044 | * 42: the answer to everything. | |
1045 | * | |
1046 | * In this case, it happens to be the answer to | |
1047 | * 40 (length of sha1 hex representation) | |
1048 | * +1 (space in between hex and name) | |
1049 | * +1 (newline at the end of the line) | |
1050 | */ | |
1051 | int len = strlen(line) - 42; | |
1052 | ||
1053 | if (len <= 0) | |
1054 | return NULL; | |
1055 | if (get_sha1_hex(line, sha1) < 0) | |
1056 | return NULL; | |
1057 | if (!isspace(line[40])) | |
1058 | return NULL; | |
1059 | line += 41; | |
1060 | if (isspace(*line)) | |
1061 | return NULL; | |
1062 | if (line[len] != '\n') | |
1063 | return NULL; | |
1064 | line[len] = 0; | |
1065 | ||
1066 | return line; | |
1067 | } | |
1068 | ||
c29c46fa MH |
1069 | /* |
1070 | * Read f, which is a packed-refs file, into dir. | |
1071 | * | |
1072 | * A comment line of the form "# pack-refs with: " may contain zero or | |
1073 | * more traits. We interpret the traits as follows: | |
1074 | * | |
1075 | * No traits: | |
1076 | * | |
1077 | * Probably no references are peeled. But if the file contains a | |
1078 | * peeled value for a reference, we will use it. | |
1079 | * | |
1080 | * peeled: | |
1081 | * | |
1082 | * References under "refs/tags/", if they *can* be peeled, *are* | |
1083 | * peeled in this file. References outside of "refs/tags/" are | |
1084 | * probably not peeled even if they could have been, but if we find | |
1085 | * a peeled value for such a reference we will use it. | |
1086 | * | |
1087 | * fully-peeled: | |
1088 | * | |
1089 | * All references in the file that can be peeled are peeled. | |
1090 | * Inversely (and this is more important), any references in the | |
1091 | * file for which no peeled value is recorded is not peelable. This | |
1092 | * trait should typically be written alongside "peeled" for | |
1093 | * compatibility with older clients, but we do not require it | |
1094 | * (i.e., "peeled" is a no-op if "fully-peeled" is set). | |
1095 | */ | |
d3177275 | 1096 | static void read_packed_refs(FILE *f, struct ref_dir *dir) |
f4204ab9 | 1097 | { |
e9c4c111 | 1098 | struct ref_entry *last = NULL; |
f4204ab9 | 1099 | char refline[PATH_MAX]; |
c29c46fa | 1100 | enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE; |
f4204ab9 JH |
1101 | |
1102 | while (fgets(refline, sizeof(refline), f)) { | |
1103 | unsigned char sha1[20]; | |
dfefa935 | 1104 | const char *refname; |
f4204ab9 JH |
1105 | static const char header[] = "# pack-refs with:"; |
1106 | ||
1107 | if (!strncmp(refline, header, sizeof(header)-1)) { | |
1108 | const char *traits = refline + sizeof(header) - 1; | |
c29c46fa MH |
1109 | if (strstr(traits, " fully-peeled ")) |
1110 | peeled = PEELED_FULLY; | |
1111 | else if (strstr(traits, " peeled ")) | |
1112 | peeled = PEELED_TAGS; | |
f4204ab9 JH |
1113 | /* perhaps other traits later as well */ |
1114 | continue; | |
1115 | } | |
1116 | ||
dfefa935 MH |
1117 | refname = parse_ref_line(refline, sha1); |
1118 | if (refname) { | |
c29c46fa MH |
1119 | last = create_ref_entry(refname, sha1, REF_ISPACKED, 1); |
1120 | if (peeled == PEELED_FULLY || | |
59556548 | 1121 | (peeled == PEELED_TAGS && starts_with(refname, "refs/tags/"))) |
c29c46fa | 1122 | last->flag |= REF_KNOWS_PEELED; |
d3177275 | 1123 | add_ref(dir, last); |
f4204ab9 JH |
1124 | continue; |
1125 | } | |
1126 | if (last && | |
1127 | refline[0] == '^' && | |
3feb4f0c MH |
1128 | strlen(refline) == PEELED_LINE_LENGTH && |
1129 | refline[PEELED_LINE_LENGTH - 1] == '\n' && | |
c29c46fa | 1130 | !get_sha1_hex(refline + 1, sha1)) { |
593f1bb8 | 1131 | hashcpy(last->u.value.peeled, sha1); |
c29c46fa MH |
1132 | /* |
1133 | * Regardless of what the file header said, | |
1134 | * we definitely know the value of *this* | |
1135 | * reference: | |
1136 | */ | |
1137 | last->flag |= REF_KNOWS_PEELED; | |
1138 | } | |
f4204ab9 | 1139 | } |
f4204ab9 JH |
1140 | } |
1141 | ||
2fff7812 MH |
1142 | /* |
1143 | * Get the packed_ref_cache for the specified ref_cache, creating it | |
1144 | * if necessary. | |
1145 | */ | |
1146 | static struct packed_ref_cache *get_packed_ref_cache(struct ref_cache *refs) | |
5e290ff7 | 1147 | { |
ca919930 JK |
1148 | const char *packed_refs_file; |
1149 | ||
1150 | if (*refs->name) | |
1151 | packed_refs_file = git_path_submodule(refs->name, "packed-refs"); | |
1152 | else | |
1153 | packed_refs_file = git_path("packed-refs"); | |
1154 | ||
1155 | if (refs->packed && | |
1156 | !stat_validity_check(&refs->packed->validity, packed_refs_file)) | |
1157 | clear_packed_ref_cache(refs); | |
1158 | ||
d12229f5 | 1159 | if (!refs->packed) { |
4349a668 | 1160 | FILE *f; |
0bad611b | 1161 | |
2fff7812 | 1162 | refs->packed = xcalloc(1, sizeof(*refs->packed)); |
5f5e2a88 | 1163 | acquire_packed_ref_cache(refs->packed); |
2fff7812 | 1164 | refs->packed->root = create_dir_entry(refs, "", 0, 0); |
4349a668 | 1165 | f = fopen(packed_refs_file, "r"); |
e1e22e37 | 1166 | if (f) { |
ca919930 | 1167 | stat_validity_update(&refs->packed->validity, fileno(f)); |
2fff7812 | 1168 | read_packed_refs(f, get_ref_dir(refs->packed->root)); |
e1e22e37 | 1169 | fclose(f); |
e1e22e37 | 1170 | } |
e1e22e37 | 1171 | } |
2fff7812 MH |
1172 | return refs->packed; |
1173 | } | |
1174 | ||
1175 | static struct ref_dir *get_packed_ref_dir(struct packed_ref_cache *packed_ref_cache) | |
1176 | { | |
1177 | return get_ref_dir(packed_ref_cache->root); | |
1178 | } | |
1179 | ||
1180 | static struct ref_dir *get_packed_refs(struct ref_cache *refs) | |
1181 | { | |
1182 | return get_packed_ref_dir(get_packed_ref_cache(refs)); | |
e1e22e37 LT |
1183 | } |
1184 | ||
30249ee6 MH |
1185 | void add_packed_ref(const char *refname, const unsigned char *sha1) |
1186 | { | |
9f69d297 MH |
1187 | struct packed_ref_cache *packed_ref_cache = |
1188 | get_packed_ref_cache(&ref_cache); | |
1189 | ||
1190 | if (!packed_ref_cache->lock) | |
1191 | die("internal error: packed refs not locked"); | |
1192 | add_ref(get_packed_ref_dir(packed_ref_cache), | |
9da31cb0 | 1193 | create_ref_entry(refname, sha1, REF_ISPACKED, 1)); |
30249ee6 MH |
1194 | } |
1195 | ||
abc39098 | 1196 | /* |
28e6a34e MH |
1197 | * Read the loose references from the namespace dirname into dir |
1198 | * (without recursing). dirname must end with '/'. dir must be the | |
1199 | * directory entry corresponding to dirname. | |
abc39098 | 1200 | */ |
423a1afc | 1201 | static void read_loose_refs(const char *dirname, struct ref_dir *dir) |
e1e22e37 | 1202 | { |
423a1afc | 1203 | struct ref_cache *refs = dir->ref_cache; |
d3177275 | 1204 | DIR *d; |
0bad611b | 1205 | const char *path; |
d5fdae67 | 1206 | struct dirent *de; |
abc39098 | 1207 | int dirnamelen = strlen(dirname); |
72b64b44 | 1208 | struct strbuf refname; |
0bad611b | 1209 | |
3b124823 | 1210 | if (*refs->name) |
66a3d20b | 1211 | path = git_path_submodule(refs->name, "%s", dirname); |
0bad611b | 1212 | else |
66a3d20b | 1213 | path = git_path("%s", dirname); |
0bad611b | 1214 | |
d3177275 | 1215 | d = opendir(path); |
d5fdae67 MH |
1216 | if (!d) |
1217 | return; | |
1218 | ||
66a3d20b MH |
1219 | strbuf_init(&refname, dirnamelen + 257); |
1220 | strbuf_add(&refname, dirname, dirnamelen); | |
d5fdae67 MH |
1221 | |
1222 | while ((de = readdir(d)) != NULL) { | |
1223 | unsigned char sha1[20]; | |
1224 | struct stat st; | |
1225 | int flag; | |
d5fdae67 MH |
1226 | const char *refdir; |
1227 | ||
1228 | if (de->d_name[0] == '.') | |
1229 | continue; | |
2975c770 | 1230 | if (ends_with(de->d_name, ".lock")) |
d5fdae67 | 1231 | continue; |
72b64b44 | 1232 | strbuf_addstr(&refname, de->d_name); |
d5fdae67 | 1233 | refdir = *refs->name |
72b64b44 MH |
1234 | ? git_path_submodule(refs->name, "%s", refname.buf) |
1235 | : git_path("%s", refname.buf); | |
1236 | if (stat(refdir, &st) < 0) { | |
1237 | ; /* silently ignore */ | |
1238 | } else if (S_ISDIR(st.st_mode)) { | |
abc39098 | 1239 | strbuf_addch(&refname, '/'); |
28e6a34e | 1240 | add_entry_to_dir(dir, |
b9146f51 RS |
1241 | create_dir_entry(refs, refname.buf, |
1242 | refname.len, 1)); | |
72b64b44 | 1243 | } else { |
3b124823 | 1244 | if (*refs->name) { |
f8948e2f | 1245 | hashclr(sha1); |
0bad611b | 1246 | flag = 0; |
72b64b44 | 1247 | if (resolve_gitlink_ref(refs->name, refname.buf, sha1) < 0) { |
0bad611b | 1248 | hashclr(sha1); |
98ac34b2 | 1249 | flag |= REF_ISBROKEN; |
0bad611b | 1250 | } |
72b64b44 | 1251 | } else if (read_ref_full(refname.buf, sha1, 1, &flag)) { |
09116a1c JH |
1252 | hashclr(sha1); |
1253 | flag |= REF_ISBROKEN; | |
1254 | } | |
9f2fb4a3 MH |
1255 | add_entry_to_dir(dir, |
1256 | create_ref_entry(refname.buf, sha1, flag, 1)); | |
e1e22e37 | 1257 | } |
66a3d20b | 1258 | strbuf_setlen(&refname, dirnamelen); |
e1e22e37 | 1259 | } |
72b64b44 | 1260 | strbuf_release(&refname); |
d5fdae67 | 1261 | closedir(d); |
e1e22e37 LT |
1262 | } |
1263 | ||
d3177275 | 1264 | static struct ref_dir *get_loose_refs(struct ref_cache *refs) |
e1e22e37 | 1265 | { |
d12229f5 | 1266 | if (!refs->loose) { |
28e6a34e MH |
1267 | /* |
1268 | * Mark the top-level directory complete because we | |
1269 | * are about to read the only subdirectory that can | |
1270 | * hold references: | |
1271 | */ | |
b9146f51 | 1272 | refs->loose = create_dir_entry(refs, "", 0, 0); |
28e6a34e MH |
1273 | /* |
1274 | * Create an incomplete entry for "refs/": | |
1275 | */ | |
1276 | add_entry_to_dir(get_ref_dir(refs->loose), | |
b9146f51 | 1277 | create_dir_entry(refs, "refs/", 5, 1)); |
e1e22e37 | 1278 | } |
d7826d54 | 1279 | return get_ref_dir(refs->loose); |
e1e22e37 LT |
1280 | } |
1281 | ||
ca8db142 LT |
1282 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
1283 | #define MAXDEPTH 5 | |
0ebde32c LT |
1284 | #define MAXREFLEN (1024) |
1285 | ||
e5fa45c1 JH |
1286 | /* |
1287 | * Called by resolve_gitlink_ref_recursive() after it failed to read | |
b0626608 MH |
1288 | * from the loose refs in ref_cache refs. Find <refname> in the |
1289 | * packed-refs file for the submodule. | |
e5fa45c1 | 1290 | */ |
b0626608 | 1291 | static int resolve_gitlink_packed_ref(struct ref_cache *refs, |
85be1fe3 | 1292 | const char *refname, unsigned char *sha1) |
0ebde32c | 1293 | { |
2c5c66be | 1294 | struct ref_entry *ref; |
d3177275 | 1295 | struct ref_dir *dir = get_packed_refs(refs); |
0ebde32c | 1296 | |
432ad41e | 1297 | ref = find_ref(dir, refname); |
b0626608 MH |
1298 | if (ref == NULL) |
1299 | return -1; | |
1300 | ||
50546b15 | 1301 | hashcpy(sha1, ref->u.value.sha1); |
b0626608 | 1302 | return 0; |
0ebde32c LT |
1303 | } |
1304 | ||
b0626608 | 1305 | static int resolve_gitlink_ref_recursive(struct ref_cache *refs, |
85be1fe3 | 1306 | const char *refname, unsigned char *sha1, |
dfefa935 | 1307 | int recursion) |
0ebde32c | 1308 | { |
064d51dc | 1309 | int fd, len; |
0ebde32c | 1310 | char buffer[128], *p; |
064d51dc | 1311 | char *path; |
0ebde32c | 1312 | |
064d51dc | 1313 | if (recursion > MAXDEPTH || strlen(refname) > MAXREFLEN) |
0ebde32c | 1314 | return -1; |
064d51dc MH |
1315 | path = *refs->name |
1316 | ? git_path_submodule(refs->name, "%s", refname) | |
1317 | : git_path("%s", refname); | |
1318 | fd = open(path, O_RDONLY); | |
0ebde32c | 1319 | if (fd < 0) |
b0626608 | 1320 | return resolve_gitlink_packed_ref(refs, refname, sha1); |
0ebde32c LT |
1321 | |
1322 | len = read(fd, buffer, sizeof(buffer)-1); | |
1323 | close(fd); | |
1324 | if (len < 0) | |
1325 | return -1; | |
1326 | while (len && isspace(buffer[len-1])) | |
1327 | len--; | |
1328 | buffer[len] = 0; | |
1329 | ||
1330 | /* Was it a detached head or an old-fashioned symlink? */ | |
85be1fe3 | 1331 | if (!get_sha1_hex(buffer, sha1)) |
0ebde32c LT |
1332 | return 0; |
1333 | ||
1334 | /* Symref? */ | |
1335 | if (strncmp(buffer, "ref:", 4)) | |
1336 | return -1; | |
1337 | p = buffer + 4; | |
1338 | while (isspace(*p)) | |
1339 | p++; | |
1340 | ||
064d51dc | 1341 | return resolve_gitlink_ref_recursive(refs, p, sha1, recursion+1); |
0ebde32c LT |
1342 | } |
1343 | ||
85be1fe3 | 1344 | int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1) |
0ebde32c LT |
1345 | { |
1346 | int len = strlen(path), retval; | |
064d51dc | 1347 | char *submodule; |
b0626608 | 1348 | struct ref_cache *refs; |
0ebde32c LT |
1349 | |
1350 | while (len && path[len-1] == '/') | |
1351 | len--; | |
1352 | if (!len) | |
1353 | return -1; | |
b0626608 MH |
1354 | submodule = xstrndup(path, len); |
1355 | refs = get_ref_cache(submodule); | |
1356 | free(submodule); | |
1357 | ||
064d51dc | 1358 | retval = resolve_gitlink_ref_recursive(refs, refname, sha1, 0); |
0ebde32c LT |
1359 | return retval; |
1360 | } | |
ca8db142 | 1361 | |
4886b89f | 1362 | /* |
63331581 MH |
1363 | * Return the ref_entry for the given refname from the packed |
1364 | * references. If it does not exist, return NULL. | |
4886b89f | 1365 | */ |
63331581 | 1366 | static struct ref_entry *get_packed_ref(const char *refname) |
c224ca7f | 1367 | { |
9da31cb0 | 1368 | return find_ref(get_packed_refs(&ref_cache), refname); |
c224ca7f MH |
1369 | } |
1370 | ||
47f534bf MH |
1371 | /* |
1372 | * A loose ref file doesn't exist; check for a packed ref. The | |
1373 | * options are forwarded from resolve_safe_unsafe(). | |
1374 | */ | |
1375 | static const char *handle_missing_loose_ref(const char *refname, | |
1376 | unsigned char *sha1, | |
1377 | int reading, | |
1378 | int *flag) | |
1379 | { | |
1380 | struct ref_entry *entry; | |
1381 | ||
1382 | /* | |
1383 | * The loose reference file does not exist; check for a packed | |
1384 | * reference. | |
1385 | */ | |
1386 | entry = get_packed_ref(refname); | |
1387 | if (entry) { | |
1388 | hashcpy(sha1, entry->u.value.sha1); | |
1389 | if (flag) | |
1390 | *flag |= REF_ISPACKED; | |
1391 | return refname; | |
1392 | } | |
1393 | /* The reference is not a packed reference, either. */ | |
1394 | if (reading) { | |
1395 | return NULL; | |
1396 | } else { | |
1397 | hashclr(sha1); | |
1398 | return refname; | |
1399 | } | |
1400 | } | |
1401 | ||
76d70dc0 | 1402 | /* This function needs to return a meaningful errno on failure */ |
8d68493f | 1403 | const char *resolve_ref_unsafe(const char *refname, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 1404 | { |
0104ca09 HO |
1405 | int depth = MAXDEPTH; |
1406 | ssize_t len; | |
a876ed83 | 1407 | char buffer[256]; |
dfefa935 | 1408 | static char refname_buffer[256]; |
ca8db142 | 1409 | |
8da19775 JH |
1410 | if (flag) |
1411 | *flag = 0; | |
1412 | ||
76d70dc0 RS |
1413 | if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) { |
1414 | errno = EINVAL; | |
8384d788 | 1415 | return NULL; |
76d70dc0 | 1416 | } |
8384d788 | 1417 | |
a876ed83 | 1418 | for (;;) { |
55956350 | 1419 | char path[PATH_MAX]; |
a876ed83 JH |
1420 | struct stat st; |
1421 | char *buf; | |
1422 | int fd; | |
8a65ff76 | 1423 | |
76d70dc0 RS |
1424 | if (--depth < 0) { |
1425 | errno = ELOOP; | |
a876ed83 | 1426 | return NULL; |
76d70dc0 | 1427 | } |
ca8db142 | 1428 | |
dfefa935 | 1429 | git_snpath(path, sizeof(path), "%s", refname); |
c224ca7f | 1430 | |
fcb7c762 MH |
1431 | /* |
1432 | * We might have to loop back here to avoid a race | |
1433 | * condition: first we lstat() the file, then we try | |
1434 | * to read it as a link or as a file. But if somebody | |
1435 | * changes the type of the file (file <-> directory | |
1436 | * <-> symlink) between the lstat() and reading, then | |
1437 | * we don't want to report that as an error but rather | |
1438 | * try again starting with the lstat(). | |
1439 | */ | |
1440 | stat_ref: | |
a876ed83 | 1441 | if (lstat(path, &st) < 0) { |
47f534bf MH |
1442 | if (errno == ENOENT) |
1443 | return handle_missing_loose_ref(refname, sha1, | |
1444 | reading, flag); | |
1445 | else | |
a876ed83 | 1446 | return NULL; |
a876ed83 | 1447 | } |
ca8db142 | 1448 | |
a876ed83 JH |
1449 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
1450 | if (S_ISLNK(st.st_mode)) { | |
1451 | len = readlink(path, buffer, sizeof(buffer)-1); | |
fcb7c762 MH |
1452 | if (len < 0) { |
1453 | if (errno == ENOENT || errno == EINVAL) | |
1454 | /* inconsistent with lstat; retry */ | |
1455 | goto stat_ref; | |
1456 | else | |
1457 | return NULL; | |
1458 | } | |
b54cb795 | 1459 | buffer[len] = 0; |
59556548 | 1460 | if (starts_with(buffer, "refs/") && |
1f58a038 | 1461 | !check_refname_format(buffer, 0)) { |
dfefa935 MH |
1462 | strcpy(refname_buffer, buffer); |
1463 | refname = refname_buffer; | |
8da19775 JH |
1464 | if (flag) |
1465 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
1466 | continue; |
1467 | } | |
ca8db142 | 1468 | } |
a876ed83 | 1469 | |
7a21632f DS |
1470 | /* Is it a directory? */ |
1471 | if (S_ISDIR(st.st_mode)) { | |
1472 | errno = EISDIR; | |
1473 | return NULL; | |
1474 | } | |
1475 | ||
a876ed83 JH |
1476 | /* |
1477 | * Anything else, just open it and try to use it as | |
1478 | * a ref | |
1479 | */ | |
1480 | fd = open(path, O_RDONLY); | |
fcb7c762 MH |
1481 | if (fd < 0) { |
1482 | if (errno == ENOENT) | |
1483 | /* inconsistent with lstat; retry */ | |
1484 | goto stat_ref; | |
1485 | else | |
1486 | return NULL; | |
1487 | } | |
93d26e4c | 1488 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
76d70dc0 RS |
1489 | if (len < 0) { |
1490 | int save_errno = errno; | |
1491 | close(fd); | |
1492 | errno = save_errno; | |
28775050 | 1493 | return NULL; |
76d70dc0 RS |
1494 | } |
1495 | close(fd); | |
28775050 MH |
1496 | while (len && isspace(buffer[len-1])) |
1497 | len--; | |
1498 | buffer[len] = '\0'; | |
a876ed83 JH |
1499 | |
1500 | /* | |
1501 | * Is it a symbolic ref? | |
1502 | */ | |
59556548 | 1503 | if (!starts_with(buffer, "ref:")) { |
2884c06a MH |
1504 | /* |
1505 | * Please note that FETCH_HEAD has a second | |
1506 | * line containing other data. | |
1507 | */ | |
1508 | if (get_sha1_hex(buffer, sha1) || | |
1509 | (buffer[40] != '\0' && !isspace(buffer[40]))) { | |
1510 | if (flag) | |
1511 | *flag |= REF_ISBROKEN; | |
76d70dc0 | 1512 | errno = EINVAL; |
2884c06a MH |
1513 | return NULL; |
1514 | } | |
1515 | return refname; | |
1516 | } | |
55956350 JH |
1517 | if (flag) |
1518 | *flag |= REF_ISSYMREF; | |
a876ed83 | 1519 | buf = buffer + 4; |
28775050 MH |
1520 | while (isspace(*buf)) |
1521 | buf++; | |
313fb010 | 1522 | if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) { |
55956350 JH |
1523 | if (flag) |
1524 | *flag |= REF_ISBROKEN; | |
76d70dc0 | 1525 | errno = EINVAL; |
313fb010 MH |
1526 | return NULL; |
1527 | } | |
dfefa935 | 1528 | refname = strcpy(refname_buffer, buf); |
8a65ff76 | 1529 | } |
a876ed83 JH |
1530 | } |
1531 | ||
96ec7b1e NTND |
1532 | char *resolve_refdup(const char *ref, unsigned char *sha1, int reading, int *flag) |
1533 | { | |
8cad4744 | 1534 | const char *ret = resolve_ref_unsafe(ref, sha1, reading, flag); |
96ec7b1e NTND |
1535 | return ret ? xstrdup(ret) : NULL; |
1536 | } | |
1537 | ||
d08bae7e IL |
1538 | /* The argument to filter_refs */ |
1539 | struct ref_filter { | |
1540 | const char *pattern; | |
1541 | each_ref_fn *fn; | |
1542 | void *cb_data; | |
1543 | }; | |
1544 | ||
dfefa935 | 1545 | int read_ref_full(const char *refname, unsigned char *sha1, int reading, int *flags) |
a876ed83 | 1546 | { |
8d68493f | 1547 | if (resolve_ref_unsafe(refname, sha1, reading, flags)) |
a876ed83 JH |
1548 | return 0; |
1549 | return -1; | |
8a65ff76 LT |
1550 | } |
1551 | ||
dfefa935 | 1552 | int read_ref(const char *refname, unsigned char *sha1) |
c6893323 | 1553 | { |
dfefa935 | 1554 | return read_ref_full(refname, sha1, 1, NULL); |
c6893323 NTND |
1555 | } |
1556 | ||
bc5fd6d3 | 1557 | int ref_exists(const char *refname) |
ef06b918 | 1558 | { |
bc5fd6d3 MH |
1559 | unsigned char sha1[20]; |
1560 | return !!resolve_ref_unsafe(refname, sha1, 1, NULL); | |
ef06b918 JH |
1561 | } |
1562 | ||
85be1fe3 | 1563 | static int filter_refs(const char *refname, const unsigned char *sha1, int flags, |
dfefa935 | 1564 | void *data) |
d08bae7e IL |
1565 | { |
1566 | struct ref_filter *filter = (struct ref_filter *)data; | |
eb07894f | 1567 | if (wildmatch(filter->pattern, refname, 0, NULL)) |
d08bae7e | 1568 | return 0; |
85be1fe3 | 1569 | return filter->fn(refname, sha1, flags, filter->cb_data); |
d08bae7e IL |
1570 | } |
1571 | ||
68cf8703 MH |
1572 | enum peel_status { |
1573 | /* object was peeled successfully: */ | |
1574 | PEEL_PEELED = 0, | |
1575 | ||
1576 | /* | |
1577 | * object cannot be peeled because the named object (or an | |
1578 | * object referred to by a tag in the peel chain), does not | |
1579 | * exist. | |
1580 | */ | |
1581 | PEEL_INVALID = -1, | |
1582 | ||
1583 | /* object cannot be peeled because it is not a tag: */ | |
9a489f3c MH |
1584 | PEEL_NON_TAG = -2, |
1585 | ||
1586 | /* ref_entry contains no peeled value because it is a symref: */ | |
1587 | PEEL_IS_SYMREF = -3, | |
1588 | ||
1589 | /* | |
1590 | * ref_entry cannot be peeled because it is broken (i.e., the | |
1591 | * symbolic reference cannot even be resolved to an object | |
1592 | * name): | |
1593 | */ | |
1594 | PEEL_BROKEN = -4 | |
68cf8703 MH |
1595 | }; |
1596 | ||
cb2ae1c4 MH |
1597 | /* |
1598 | * Peel the named object; i.e., if the object is a tag, resolve the | |
68cf8703 MH |
1599 | * tag recursively until a non-tag is found. If successful, store the |
1600 | * result to sha1 and return PEEL_PEELED. If the object is not a tag | |
1601 | * or is not valid, return PEEL_NON_TAG or PEEL_INVALID, respectively, | |
1602 | * and leave sha1 unchanged. | |
cb2ae1c4 | 1603 | */ |
68cf8703 | 1604 | static enum peel_status peel_object(const unsigned char *name, unsigned char *sha1) |
cb2ae1c4 MH |
1605 | { |
1606 | struct object *o = lookup_unknown_object(name); | |
1607 | ||
1608 | if (o->type == OBJ_NONE) { | |
1609 | int type = sha1_object_info(name, NULL); | |
8ff226a9 | 1610 | if (type < 0 || !object_as_type(o, type, 0)) |
68cf8703 | 1611 | return PEEL_INVALID; |
cb2ae1c4 MH |
1612 | } |
1613 | ||
1614 | if (o->type != OBJ_TAG) | |
68cf8703 | 1615 | return PEEL_NON_TAG; |
cb2ae1c4 MH |
1616 | |
1617 | o = deref_tag_noverify(o); | |
1618 | if (!o) | |
68cf8703 | 1619 | return PEEL_INVALID; |
cb2ae1c4 MH |
1620 | |
1621 | hashcpy(sha1, o->sha1); | |
68cf8703 | 1622 | return PEEL_PEELED; |
cb2ae1c4 MH |
1623 | } |
1624 | ||
9a489f3c | 1625 | /* |
f85354b5 MH |
1626 | * Peel the entry (if possible) and return its new peel_status. If |
1627 | * repeel is true, re-peel the entry even if there is an old peeled | |
1628 | * value that is already stored in it. | |
694b7a19 MH |
1629 | * |
1630 | * It is OK to call this function with a packed reference entry that | |
1631 | * might be stale and might even refer to an object that has since | |
1632 | * been garbage-collected. In such a case, if the entry has | |
1633 | * REF_KNOWS_PEELED then leave the status unchanged and return | |
1634 | * PEEL_PEELED or PEEL_NON_TAG; otherwise, return PEEL_INVALID. | |
9a489f3c | 1635 | */ |
f85354b5 | 1636 | static enum peel_status peel_entry(struct ref_entry *entry, int repeel) |
9a489f3c MH |
1637 | { |
1638 | enum peel_status status; | |
1639 | ||
f85354b5 MH |
1640 | if (entry->flag & REF_KNOWS_PEELED) { |
1641 | if (repeel) { | |
1642 | entry->flag &= ~REF_KNOWS_PEELED; | |
1643 | hashclr(entry->u.value.peeled); | |
1644 | } else { | |
1645 | return is_null_sha1(entry->u.value.peeled) ? | |
1646 | PEEL_NON_TAG : PEEL_PEELED; | |
1647 | } | |
1648 | } | |
9a489f3c MH |
1649 | if (entry->flag & REF_ISBROKEN) |
1650 | return PEEL_BROKEN; | |
1651 | if (entry->flag & REF_ISSYMREF) | |
1652 | return PEEL_IS_SYMREF; | |
1653 | ||
1654 | status = peel_object(entry->u.value.sha1, entry->u.value.peeled); | |
1655 | if (status == PEEL_PEELED || status == PEEL_NON_TAG) | |
1656 | entry->flag |= REF_KNOWS_PEELED; | |
1657 | return status; | |
1658 | } | |
1659 | ||
dfefa935 | 1660 | int peel_ref(const char *refname, unsigned char *sha1) |
cf0adba7 JH |
1661 | { |
1662 | int flag; | |
1663 | unsigned char base[20]; | |
cf0adba7 | 1664 | |
dfefa935 | 1665 | if (current_ref && (current_ref->name == refname |
9a489f3c | 1666 | || !strcmp(current_ref->name, refname))) { |
f85354b5 | 1667 | if (peel_entry(current_ref, 0)) |
9a489f3c MH |
1668 | return -1; |
1669 | hashcpy(sha1, current_ref->u.value.peeled); | |
1670 | return 0; | |
0ae91be0 SP |
1671 | } |
1672 | ||
dfefa935 | 1673 | if (read_ref_full(refname, base, 1, &flag)) |
cf0adba7 JH |
1674 | return -1; |
1675 | ||
9a489f3c MH |
1676 | /* |
1677 | * If the reference is packed, read its ref_entry from the | |
1678 | * cache in the hope that we already know its peeled value. | |
1679 | * We only try this optimization on packed references because | |
1680 | * (a) forcing the filling of the loose reference cache could | |
1681 | * be expensive and (b) loose references anyway usually do not | |
1682 | * have REF_KNOWS_PEELED. | |
1683 | */ | |
1684 | if (flag & REF_ISPACKED) { | |
f361baeb | 1685 | struct ref_entry *r = get_packed_ref(refname); |
9a489f3c | 1686 | if (r) { |
f85354b5 | 1687 | if (peel_entry(r, 0)) |
9a489f3c | 1688 | return -1; |
593f1bb8 | 1689 | hashcpy(sha1, r->u.value.peeled); |
e9c4c111 | 1690 | return 0; |
cf0adba7 | 1691 | } |
cf0adba7 JH |
1692 | } |
1693 | ||
cb2ae1c4 | 1694 | return peel_object(base, sha1); |
cf0adba7 JH |
1695 | } |
1696 | ||
bc5fd6d3 MH |
1697 | struct warn_if_dangling_data { |
1698 | FILE *fp; | |
1699 | const char *refname; | |
e6bea66d | 1700 | const struct string_list *refnames; |
bc5fd6d3 MH |
1701 | const char *msg_fmt; |
1702 | }; | |
1703 | ||
1704 | static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1, | |
1705 | int flags, void *cb_data) | |
1706 | { | |
1707 | struct warn_if_dangling_data *d = cb_data; | |
1708 | const char *resolves_to; | |
1709 | unsigned char junk[20]; | |
1710 | ||
1711 | if (!(flags & REF_ISSYMREF)) | |
1712 | return 0; | |
1713 | ||
1714 | resolves_to = resolve_ref_unsafe(refname, junk, 0, NULL); | |
e6bea66d JL |
1715 | if (!resolves_to |
1716 | || (d->refname | |
1717 | ? strcmp(resolves_to, d->refname) | |
1718 | : !string_list_has_string(d->refnames, resolves_to))) { | |
bc5fd6d3 | 1719 | return 0; |
e6bea66d | 1720 | } |
bc5fd6d3 MH |
1721 | |
1722 | fprintf(d->fp, d->msg_fmt, refname); | |
1be65eda | 1723 | fputc('\n', d->fp); |
bc5fd6d3 MH |
1724 | return 0; |
1725 | } | |
1726 | ||
1727 | void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname) | |
1728 | { | |
1729 | struct warn_if_dangling_data data; | |
1730 | ||
1731 | data.fp = fp; | |
1732 | data.refname = refname; | |
e6bea66d JL |
1733 | data.refnames = NULL; |
1734 | data.msg_fmt = msg_fmt; | |
1735 | for_each_rawref(warn_if_dangling_symref, &data); | |
1736 | } | |
1737 | ||
1738 | void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames) | |
1739 | { | |
1740 | struct warn_if_dangling_data data; | |
1741 | ||
1742 | data.fp = fp; | |
1743 | data.refname = NULL; | |
1744 | data.refnames = refnames; | |
bc5fd6d3 MH |
1745 | data.msg_fmt = msg_fmt; |
1746 | for_each_rawref(warn_if_dangling_symref, &data); | |
1747 | } | |
1748 | ||
fcce1703 | 1749 | /* |
65cf102b | 1750 | * Call fn for each reference in the specified ref_cache, omitting |
624cac35 MH |
1751 | * references not in the containing_dir of base. fn is called for all |
1752 | * references, including broken ones. If fn ever returns a non-zero | |
fcce1703 MH |
1753 | * value, stop the iteration and return that value; otherwise, return |
1754 | * 0. | |
1755 | */ | |
65cf102b | 1756 | static int do_for_each_entry(struct ref_cache *refs, const char *base, |
624cac35 | 1757 | each_ref_entry_fn fn, void *cb_data) |
8a65ff76 | 1758 | { |
98eeb09e JK |
1759 | struct packed_ref_cache *packed_ref_cache; |
1760 | struct ref_dir *loose_dir; | |
1761 | struct ref_dir *packed_dir; | |
933ac036 MH |
1762 | int retval = 0; |
1763 | ||
98eeb09e JK |
1764 | /* |
1765 | * We must make sure that all loose refs are read before accessing the | |
1766 | * packed-refs file; this avoids a race condition in which loose refs | |
1767 | * are migrated to the packed-refs file by a simultaneous process, but | |
1768 | * our in-memory view is from before the migration. get_packed_ref_cache() | |
1769 | * takes care of making sure our view is up to date with what is on | |
1770 | * disk. | |
1771 | */ | |
1772 | loose_dir = get_loose_refs(refs); | |
933ac036 | 1773 | if (base && *base) { |
933ac036 MH |
1774 | loose_dir = find_containing_dir(loose_dir, base, 0); |
1775 | } | |
98eeb09e JK |
1776 | if (loose_dir) |
1777 | prime_ref_dir(loose_dir); | |
1778 | ||
1779 | packed_ref_cache = get_packed_ref_cache(refs); | |
8baf2bb9 | 1780 | acquire_packed_ref_cache(packed_ref_cache); |
98eeb09e | 1781 | packed_dir = get_packed_ref_dir(packed_ref_cache); |
933ac036 MH |
1782 | if (base && *base) { |
1783 | packed_dir = find_containing_dir(packed_dir, base, 0); | |
933ac036 MH |
1784 | } |
1785 | ||
1786 | if (packed_dir && loose_dir) { | |
1787 | sort_ref_dir(packed_dir); | |
1788 | sort_ref_dir(loose_dir); | |
624cac35 MH |
1789 | retval = do_for_each_entry_in_dirs( |
1790 | packed_dir, loose_dir, fn, cb_data); | |
933ac036 MH |
1791 | } else if (packed_dir) { |
1792 | sort_ref_dir(packed_dir); | |
624cac35 MH |
1793 | retval = do_for_each_entry_in_dir( |
1794 | packed_dir, 0, fn, cb_data); | |
933ac036 MH |
1795 | } else if (loose_dir) { |
1796 | sort_ref_dir(loose_dir); | |
624cac35 MH |
1797 | retval = do_for_each_entry_in_dir( |
1798 | loose_dir, 0, fn, cb_data); | |
933ac036 MH |
1799 | } |
1800 | ||
8baf2bb9 | 1801 | release_packed_ref_cache(packed_ref_cache); |
933ac036 | 1802 | return retval; |
8a65ff76 LT |
1803 | } |
1804 | ||
624cac35 | 1805 | /* |
65cf102b | 1806 | * Call fn for each reference in the specified ref_cache for which the |
624cac35 MH |
1807 | * refname begins with base. If trim is non-zero, then trim that many |
1808 | * characters off the beginning of each refname before passing the | |
1809 | * refname to fn. flags can be DO_FOR_EACH_INCLUDE_BROKEN to include | |
1810 | * broken references in the iteration. If fn ever returns a non-zero | |
1811 | * value, stop the iteration and return that value; otherwise, return | |
1812 | * 0. | |
1813 | */ | |
65cf102b MH |
1814 | static int do_for_each_ref(struct ref_cache *refs, const char *base, |
1815 | each_ref_fn fn, int trim, int flags, void *cb_data) | |
624cac35 MH |
1816 | { |
1817 | struct ref_entry_cb data; | |
1818 | data.base = base; | |
1819 | data.trim = trim; | |
1820 | data.flags = flags; | |
1821 | data.fn = fn; | |
1822 | data.cb_data = cb_data; | |
1823 | ||
65cf102b | 1824 | return do_for_each_entry(refs, base, do_one_ref, &data); |
624cac35 MH |
1825 | } |
1826 | ||
0bad611b | 1827 | static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data) |
723c31fe LT |
1828 | { |
1829 | unsigned char sha1[20]; | |
8da19775 JH |
1830 | int flag; |
1831 | ||
0bad611b HV |
1832 | if (submodule) { |
1833 | if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0) | |
1834 | return fn("HEAD", sha1, 0, cb_data); | |
1835 | ||
1836 | return 0; | |
1837 | } | |
1838 | ||
c6893323 | 1839 | if (!read_ref_full("HEAD", sha1, 1, &flag)) |
8da19775 | 1840 | return fn("HEAD", sha1, flag, cb_data); |
0bad611b | 1841 | |
2f34ba32 | 1842 | return 0; |
723c31fe LT |
1843 | } |
1844 | ||
0bad611b HV |
1845 | int head_ref(each_ref_fn fn, void *cb_data) |
1846 | { | |
1847 | return do_head_ref(NULL, fn, cb_data); | |
1848 | } | |
1849 | ||
9ef6aeb0 HV |
1850 | int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
1851 | { | |
1852 | return do_head_ref(submodule, fn, cb_data); | |
1853 | } | |
1854 | ||
cb5d709f | 1855 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 1856 | { |
9da31cb0 | 1857 | return do_for_each_ref(&ref_cache, "", fn, 0, 0, cb_data); |
a62be77f SE |
1858 | } |
1859 | ||
9ef6aeb0 HV |
1860 | int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
1861 | { | |
65cf102b | 1862 | return do_for_each_ref(get_ref_cache(submodule), "", fn, 0, 0, cb_data); |
a62be77f SE |
1863 | } |
1864 | ||
2a8177b6 CC |
1865 | int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data) |
1866 | { | |
9da31cb0 | 1867 | return do_for_each_ref(&ref_cache, prefix, fn, strlen(prefix), 0, cb_data); |
2a8177b6 CC |
1868 | } |
1869 | ||
9ef6aeb0 HV |
1870 | int for_each_ref_in_submodule(const char *submodule, const char *prefix, |
1871 | each_ref_fn fn, void *cb_data) | |
1872 | { | |
65cf102b | 1873 | return do_for_each_ref(get_ref_cache(submodule), prefix, fn, strlen(prefix), 0, cb_data); |
2a8177b6 CC |
1874 | } |
1875 | ||
cb5d709f | 1876 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 1877 | { |
2a8177b6 | 1878 | return for_each_ref_in("refs/tags/", fn, cb_data); |
a62be77f SE |
1879 | } |
1880 | ||
9ef6aeb0 HV |
1881 | int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
1882 | { | |
1883 | return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data); | |
1884 | } | |
1885 | ||
cb5d709f | 1886 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 1887 | { |
2a8177b6 | 1888 | return for_each_ref_in("refs/heads/", fn, cb_data); |
a62be77f SE |
1889 | } |
1890 | ||
9ef6aeb0 HV |
1891 | int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
1892 | { | |
1893 | return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data); | |
1894 | } | |
1895 | ||
cb5d709f | 1896 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 1897 | { |
2a8177b6 | 1898 | return for_each_ref_in("refs/remotes/", fn, cb_data); |
f8948e2f JH |
1899 | } |
1900 | ||
9ef6aeb0 HV |
1901 | int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
1902 | { | |
1903 | return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data); | |
1904 | } | |
1905 | ||
29268700 CC |
1906 | int for_each_replace_ref(each_ref_fn fn, void *cb_data) |
1907 | { | |
9da31cb0 | 1908 | return do_for_each_ref(&ref_cache, "refs/replace/", fn, 13, 0, cb_data); |
29268700 CC |
1909 | } |
1910 | ||
a1bea2c1 JT |
1911 | int head_ref_namespaced(each_ref_fn fn, void *cb_data) |
1912 | { | |
1913 | struct strbuf buf = STRBUF_INIT; | |
1914 | int ret = 0; | |
1915 | unsigned char sha1[20]; | |
1916 | int flag; | |
1917 | ||
1918 | strbuf_addf(&buf, "%sHEAD", get_git_namespace()); | |
c6893323 | 1919 | if (!read_ref_full(buf.buf, sha1, 1, &flag)) |
a1bea2c1 JT |
1920 | ret = fn(buf.buf, sha1, flag, cb_data); |
1921 | strbuf_release(&buf); | |
1922 | ||
1923 | return ret; | |
1924 | } | |
1925 | ||
1926 | int for_each_namespaced_ref(each_ref_fn fn, void *cb_data) | |
1927 | { | |
1928 | struct strbuf buf = STRBUF_INIT; | |
1929 | int ret; | |
1930 | strbuf_addf(&buf, "%srefs/", get_git_namespace()); | |
9da31cb0 | 1931 | ret = do_for_each_ref(&ref_cache, buf.buf, fn, 0, 0, cb_data); |
a1bea2c1 JT |
1932 | strbuf_release(&buf); |
1933 | return ret; | |
1934 | } | |
1935 | ||
b09fe971 IL |
1936 | int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, |
1937 | const char *prefix, void *cb_data) | |
d08bae7e IL |
1938 | { |
1939 | struct strbuf real_pattern = STRBUF_INIT; | |
1940 | struct ref_filter filter; | |
d08bae7e IL |
1941 | int ret; |
1942 | ||
59556548 | 1943 | if (!prefix && !starts_with(pattern, "refs/")) |
d08bae7e | 1944 | strbuf_addstr(&real_pattern, "refs/"); |
b09fe971 IL |
1945 | else if (prefix) |
1946 | strbuf_addstr(&real_pattern, prefix); | |
d08bae7e IL |
1947 | strbuf_addstr(&real_pattern, pattern); |
1948 | ||
894a9d33 | 1949 | if (!has_glob_specials(pattern)) { |
9517e6b8 | 1950 | /* Append implied '/' '*' if not present. */ |
d08bae7e IL |
1951 | if (real_pattern.buf[real_pattern.len - 1] != '/') |
1952 | strbuf_addch(&real_pattern, '/'); | |
1953 | /* No need to check for '*', there is none. */ | |
1954 | strbuf_addch(&real_pattern, '*'); | |
1955 | } | |
1956 | ||
1957 | filter.pattern = real_pattern.buf; | |
1958 | filter.fn = fn; | |
1959 | filter.cb_data = cb_data; | |
1960 | ret = for_each_ref(filter_refs, &filter); | |
1961 | ||
1962 | strbuf_release(&real_pattern); | |
1963 | return ret; | |
1964 | } | |
1965 | ||
b09fe971 IL |
1966 | int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data) |
1967 | { | |
1968 | return for_each_glob_ref_in(fn, pattern, NULL, cb_data); | |
1969 | } | |
1970 | ||
f8948e2f JH |
1971 | int for_each_rawref(each_ref_fn fn, void *cb_data) |
1972 | { | |
9da31cb0 | 1973 | return do_for_each_ref(&ref_cache, "", fn, 0, |
f8948e2f | 1974 | DO_FOR_EACH_INCLUDE_BROKEN, cb_data); |
8a65ff76 LT |
1975 | } |
1976 | ||
4577e483 | 1977 | const char *prettify_refname(const char *name) |
a9c37a72 | 1978 | { |
a9c37a72 | 1979 | return name + ( |
59556548 CC |
1980 | starts_with(name, "refs/heads/") ? 11 : |
1981 | starts_with(name, "refs/tags/") ? 10 : | |
1982 | starts_with(name, "refs/remotes/") ? 13 : | |
a9c37a72 DB |
1983 | 0); |
1984 | } | |
1985 | ||
54457fe5 | 1986 | static const char *ref_rev_parse_rules[] = { |
79803322 SP |
1987 | "%.*s", |
1988 | "refs/%.*s", | |
1989 | "refs/tags/%.*s", | |
1990 | "refs/heads/%.*s", | |
1991 | "refs/remotes/%.*s", | |
1992 | "refs/remotes/%.*s/HEAD", | |
1993 | NULL | |
1994 | }; | |
1995 | ||
54457fe5 | 1996 | int refname_match(const char *abbrev_name, const char *full_name) |
79803322 SP |
1997 | { |
1998 | const char **p; | |
1999 | const int abbrev_name_len = strlen(abbrev_name); | |
2000 | ||
54457fe5 | 2001 | for (p = ref_rev_parse_rules; *p; p++) { |
79803322 SP |
2002 | if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { |
2003 | return 1; | |
2004 | } | |
2005 | } | |
2006 | ||
2007 | return 0; | |
2008 | } | |
2009 | ||
835e3c99 | 2010 | /* This function should make sure errno is meaningful on error */ |
e5f38ec3 | 2011 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
2012 | const unsigned char *old_sha1, int mustexist) |
2013 | { | |
c6893323 | 2014 | if (read_ref_full(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
835e3c99 | 2015 | int save_errno = errno; |
434cd0cd | 2016 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 | 2017 | unlock_ref(lock); |
835e3c99 | 2018 | errno = save_errno; |
4bd18c43 SP |
2019 | return NULL; |
2020 | } | |
a89fccd2 | 2021 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 2022 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
2023 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
2024 | unlock_ref(lock); | |
835e3c99 | 2025 | errno = EBUSY; |
4bd18c43 SP |
2026 | return NULL; |
2027 | } | |
2028 | return lock; | |
2029 | } | |
2030 | ||
7155b727 | 2031 | static int remove_empty_directories(const char *file) |
bc7127ef JH |
2032 | { |
2033 | /* we want to create a file but there is a directory there; | |
2034 | * if that is an empty directory (or a directory that contains | |
2035 | * only empty directories), remove them. | |
2036 | */ | |
7155b727 | 2037 | struct strbuf path; |
470a91ef | 2038 | int result, save_errno; |
bc7127ef | 2039 | |
7155b727 JS |
2040 | strbuf_init(&path, 20); |
2041 | strbuf_addstr(&path, file); | |
2042 | ||
a0f4afbe | 2043 | result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY); |
470a91ef | 2044 | save_errno = errno; |
7155b727 JS |
2045 | |
2046 | strbuf_release(&path); | |
470a91ef | 2047 | errno = save_errno; |
7155b727 JS |
2048 | |
2049 | return result; | |
bc7127ef JH |
2050 | } |
2051 | ||
ff74f7f1 JH |
2052 | /* |
2053 | * *string and *len will only be substituted, and *string returned (for | |
2054 | * later free()ing) if the string passed in is a magic short-hand form | |
2055 | * to name a branch. | |
2056 | */ | |
2057 | static char *substitute_branch_name(const char **string, int *len) | |
2058 | { | |
2059 | struct strbuf buf = STRBUF_INIT; | |
cf99a761 | 2060 | int ret = interpret_branch_name(*string, *len, &buf); |
ff74f7f1 JH |
2061 | |
2062 | if (ret == *len) { | |
2063 | size_t size; | |
2064 | *string = strbuf_detach(&buf, &size); | |
2065 | *len = size; | |
2066 | return (char *)*string; | |
2067 | } | |
2068 | ||
2069 | return NULL; | |
2070 | } | |
2071 | ||
2072 | int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref) | |
2073 | { | |
2074 | char *last_branch = substitute_branch_name(&str, &len); | |
2075 | const char **p, *r; | |
2076 | int refs_found = 0; | |
2077 | ||
2078 | *ref = NULL; | |
2079 | for (p = ref_rev_parse_rules; *p; p++) { | |
2080 | char fullref[PATH_MAX]; | |
2081 | unsigned char sha1_from_ref[20]; | |
2082 | unsigned char *this_result; | |
2083 | int flag; | |
2084 | ||
2085 | this_result = refs_found ? sha1_from_ref : sha1; | |
2086 | mksnpath(fullref, sizeof(fullref), *p, len, str); | |
8cad4744 | 2087 | r = resolve_ref_unsafe(fullref, this_result, 1, &flag); |
ff74f7f1 JH |
2088 | if (r) { |
2089 | if (!refs_found++) | |
2090 | *ref = xstrdup(r); | |
2091 | if (!warn_ambiguous_refs) | |
2092 | break; | |
55956350 | 2093 | } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) { |
ff74f7f1 | 2094 | warning("ignoring dangling symref %s.", fullref); |
55956350 JH |
2095 | } else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) { |
2096 | warning("ignoring broken ref %s.", fullref); | |
2097 | } | |
ff74f7f1 JH |
2098 | } |
2099 | free(last_branch); | |
2100 | return refs_found; | |
2101 | } | |
2102 | ||
2103 | int dwim_log(const char *str, int len, unsigned char *sha1, char **log) | |
2104 | { | |
2105 | char *last_branch = substitute_branch_name(&str, &len); | |
2106 | const char **p; | |
2107 | int logs_found = 0; | |
2108 | ||
2109 | *log = NULL; | |
2110 | for (p = ref_rev_parse_rules; *p; p++) { | |
ff74f7f1 JH |
2111 | unsigned char hash[20]; |
2112 | char path[PATH_MAX]; | |
2113 | const char *ref, *it; | |
2114 | ||
2115 | mksnpath(path, sizeof(path), *p, len, str); | |
8cad4744 | 2116 | ref = resolve_ref_unsafe(path, hash, 1, NULL); |
ff74f7f1 JH |
2117 | if (!ref) |
2118 | continue; | |
4da58835 | 2119 | if (reflog_exists(path)) |
ff74f7f1 | 2120 | it = path; |
4da58835 | 2121 | else if (strcmp(ref, path) && reflog_exists(ref)) |
ff74f7f1 JH |
2122 | it = ref; |
2123 | else | |
2124 | continue; | |
2125 | if (!logs_found++) { | |
2126 | *log = xstrdup(it); | |
2127 | hashcpy(sha1, hash); | |
2128 | } | |
2129 | if (!warn_ambiguous_refs) | |
2130 | break; | |
2131 | } | |
2132 | free(last_branch); | |
2133 | return logs_found; | |
2134 | } | |
2135 | ||
88b680ae RS |
2136 | /* |
2137 | * Locks a "refs/" ref returning the lock on success and NULL on failure. | |
2138 | * On failure errno is set to something meaningful. | |
2139 | */ | |
dfefa935 MH |
2140 | static struct ref_lock *lock_ref_sha1_basic(const char *refname, |
2141 | const unsigned char *old_sha1, | |
2142 | int flags, int *type_p) | |
4bd18c43 | 2143 | { |
434cd0cd | 2144 | char *ref_file; |
dfefa935 | 2145 | const char *orig_refname = refname; |
4bd18c43 | 2146 | struct ref_lock *lock; |
5cc3cef9 | 2147 | int last_errno = 0; |
acd3b9ec | 2148 | int type, lflags; |
4431fcc4 | 2149 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
5bdd8d4a | 2150 | int missing = 0; |
c4c61c76 | 2151 | int attempts_remaining = 3; |
4bd18c43 SP |
2152 | |
2153 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
2154 | lock->lock_fd = -1; | |
2155 | ||
8d68493f | 2156 | refname = resolve_ref_unsafe(refname, lock->old_sha1, mustexist, &type); |
dfefa935 | 2157 | if (!refname && errno == EISDIR) { |
bc7127ef JH |
2158 | /* we are trying to lock foo but we used to |
2159 | * have foo/bar which now does not exist; | |
2160 | * it is normal for the empty directory 'foo' | |
2161 | * to remain. | |
2162 | */ | |
dfefa935 | 2163 | ref_file = git_path("%s", orig_refname); |
5cc3cef9 JH |
2164 | if (remove_empty_directories(ref_file)) { |
2165 | last_errno = errno; | |
dfefa935 | 2166 | error("there are still refs under '%s'", orig_refname); |
5cc3cef9 JH |
2167 | goto error_return; |
2168 | } | |
8d68493f | 2169 | refname = resolve_ref_unsafe(orig_refname, lock->old_sha1, mustexist, &type); |
bc7127ef | 2170 | } |
68db31cc SV |
2171 | if (type_p) |
2172 | *type_p = type; | |
dfefa935 | 2173 | if (!refname) { |
5cc3cef9 | 2174 | last_errno = errno; |
818f477c | 2175 | error("unable to resolve reference %s: %s", |
dfefa935 | 2176 | orig_refname, strerror(errno)); |
5cc3cef9 | 2177 | goto error_return; |
4bd18c43 | 2178 | } |
5bdd8d4a | 2179 | missing = is_null_sha1(lock->old_sha1); |
c976d415 LH |
2180 | /* When the ref did not exist and we are creating it, |
2181 | * make sure there is no existing ref that is packed | |
2182 | * whose name begins with our refname, nor a ref whose | |
2183 | * name is a proper prefix of our refname. | |
2184 | */ | |
5bdd8d4a | 2185 | if (missing && |
9da31cb0 | 2186 | !is_refname_available(refname, NULL, get_packed_refs(&ref_cache))) { |
f475e08e | 2187 | last_errno = ENOTDIR; |
c976d415 | 2188 | goto error_return; |
f475e08e | 2189 | } |
22a3844e | 2190 | |
c33d5174 | 2191 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 2192 | |
e5c223e9 | 2193 | lflags = 0; |
acd3b9ec | 2194 | if (flags & REF_NODEREF) { |
dfefa935 | 2195 | refname = orig_refname; |
47ba4662 | 2196 | lflags |= LOCK_NO_DEREF; |
acd3b9ec | 2197 | } |
dfefa935 MH |
2198 | lock->ref_name = xstrdup(refname); |
2199 | lock->orig_ref_name = xstrdup(orig_refname); | |
2200 | ref_file = git_path("%s", refname); | |
5bdd8d4a | 2201 | if (missing) |
68db31cc SV |
2202 | lock->force_write = 1; |
2203 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
2204 | lock->force_write = 1; | |
4bd18c43 | 2205 | |
c4c61c76 MH |
2206 | retry: |
2207 | switch (safe_create_leading_directories(ref_file)) { | |
2208 | case SCLD_OK: | |
2209 | break; /* success */ | |
2210 | case SCLD_VANISHED: | |
2211 | if (--attempts_remaining > 0) | |
2212 | goto retry; | |
2213 | /* fall through */ | |
2214 | default: | |
5cc3cef9 JH |
2215 | last_errno = errno; |
2216 | error("unable to create directory for %s", ref_file); | |
2217 | goto error_return; | |
2218 | } | |
4bd18c43 | 2219 | |
acd3b9ec | 2220 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags); |
e5c223e9 MH |
2221 | if (lock->lock_fd < 0) { |
2222 | if (errno == ENOENT && --attempts_remaining > 0) | |
2223 | /* | |
2224 | * Maybe somebody just deleted one of the | |
2225 | * directories leading to ref_file. Try | |
2226 | * again: | |
2227 | */ | |
2228 | goto retry; | |
2229 | else | |
e197c218 | 2230 | unable_to_lock_die(ref_file, errno); |
e5c223e9 | 2231 | } |
4bd18c43 | 2232 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; |
5cc3cef9 JH |
2233 | |
2234 | error_return: | |
2235 | unlock_ref(lock); | |
2236 | errno = last_errno; | |
2237 | return NULL; | |
4bd18c43 SP |
2238 | } |
2239 | ||
dfefa935 | 2240 | struct ref_lock *lock_any_ref_for_update(const char *refname, |
9bbb0fa1 BK |
2241 | const unsigned char *old_sha1, |
2242 | int flags, int *type_p) | |
4bd18c43 | 2243 | { |
dfefa935 | 2244 | if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) |
257f3020 | 2245 | return NULL; |
9bbb0fa1 | 2246 | return lock_ref_sha1_basic(refname, old_sha1, flags, type_p); |
c0277d15 JH |
2247 | } |
2248 | ||
fec3137f MH |
2249 | /* |
2250 | * Write an entry to the packed-refs file for the specified refname. | |
2251 | * If peeled is non-NULL, write it as the entry's peeled value. | |
2252 | */ | |
9540ce50 | 2253 | static void write_packed_entry(FILE *fh, char *refname, unsigned char *sha1, |
fec3137f | 2254 | unsigned char *peeled) |
d66da478 | 2255 | { |
9540ce50 JK |
2256 | fprintf_or_die(fh, "%s %s\n", sha1_to_hex(sha1), refname); |
2257 | if (peeled) | |
2258 | fprintf_or_die(fh, "^%s\n", sha1_to_hex(peeled)); | |
fec3137f MH |
2259 | } |
2260 | ||
7b40d396 MH |
2261 | /* |
2262 | * An each_ref_entry_fn that writes the entry to a packed-refs file. | |
2263 | */ | |
2264 | static int write_packed_entry_fn(struct ref_entry *entry, void *cb_data) | |
2265 | { | |
7b40d396 MH |
2266 | enum peel_status peel_status = peel_entry(entry, 0); |
2267 | ||
2268 | if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG) | |
2269 | error("internal error: %s is not a valid packed reference!", | |
2270 | entry->name); | |
9540ce50 | 2271 | write_packed_entry(cb_data, entry->name, entry->u.value.sha1, |
7b40d396 MH |
2272 | peel_status == PEEL_PEELED ? |
2273 | entry->u.value.peeled : NULL); | |
2274 | return 0; | |
2275 | } | |
2276 | ||
447ff1bf | 2277 | /* This should return a meaningful errno on failure */ |
9f69d297 MH |
2278 | int lock_packed_refs(int flags) |
2279 | { | |
2280 | struct packed_ref_cache *packed_ref_cache; | |
2281 | ||
9f69d297 MH |
2282 | if (hold_lock_file_for_update(&packlock, git_path("packed-refs"), flags) < 0) |
2283 | return -1; | |
5d478f5c MH |
2284 | /* |
2285 | * Get the current packed-refs while holding the lock. If the | |
2286 | * packed-refs file has been modified since we last read it, | |
2287 | * this will automatically invalidate the cache and re-read | |
2288 | * the packed-refs file. | |
2289 | */ | |
9f69d297 MH |
2290 | packed_ref_cache = get_packed_ref_cache(&ref_cache); |
2291 | packed_ref_cache->lock = &packlock; | |
4f6b83e3 MH |
2292 | /* Increment the reference count to prevent it from being freed: */ |
2293 | acquire_packed_ref_cache(packed_ref_cache); | |
9f69d297 MH |
2294 | return 0; |
2295 | } | |
2296 | ||
d3f66555 RS |
2297 | /* |
2298 | * Commit the packed refs changes. | |
2299 | * On error we must make sure that errno contains a meaningful value. | |
2300 | */ | |
9f69d297 MH |
2301 | int commit_packed_refs(void) |
2302 | { | |
2303 | struct packed_ref_cache *packed_ref_cache = | |
2304 | get_packed_ref_cache(&ref_cache); | |
2305 | int error = 0; | |
d3f66555 | 2306 | int save_errno = 0; |
9540ce50 | 2307 | FILE *out; |
9f69d297 MH |
2308 | |
2309 | if (!packed_ref_cache->lock) | |
2310 | die("internal error: packed-refs not locked"); | |
9f69d297 | 2311 | |
6e578a31 | 2312 | out = fdopen_lock_file(packed_ref_cache->lock, "w"); |
9540ce50 JK |
2313 | if (!out) |
2314 | die_errno("unable to fdopen packed-refs descriptor"); | |
2315 | ||
2316 | fprintf_or_die(out, "%s", PACKED_REFS_HEADER); | |
9f69d297 | 2317 | do_for_each_entry_in_dir(get_packed_ref_dir(packed_ref_cache), |
9540ce50 | 2318 | 0, write_packed_entry_fn, out); |
9540ce50 | 2319 | |
d3f66555 RS |
2320 | if (commit_lock_file(packed_ref_cache->lock)) { |
2321 | save_errno = errno; | |
9f69d297 | 2322 | error = -1; |
d3f66555 | 2323 | } |
9f69d297 | 2324 | packed_ref_cache->lock = NULL; |
4f6b83e3 | 2325 | release_packed_ref_cache(packed_ref_cache); |
d3f66555 | 2326 | errno = save_errno; |
9f69d297 MH |
2327 | return error; |
2328 | } | |
2329 | ||
2330 | void rollback_packed_refs(void) | |
2331 | { | |
2332 | struct packed_ref_cache *packed_ref_cache = | |
2333 | get_packed_ref_cache(&ref_cache); | |
2334 | ||
2335 | if (!packed_ref_cache->lock) | |
2336 | die("internal error: packed-refs not locked"); | |
2337 | rollback_lock_file(packed_ref_cache->lock); | |
2338 | packed_ref_cache->lock = NULL; | |
4f6b83e3 | 2339 | release_packed_ref_cache(packed_ref_cache); |
9f69d297 MH |
2340 | clear_packed_ref_cache(&ref_cache); |
2341 | } | |
2342 | ||
32d462ce MH |
2343 | struct ref_to_prune { |
2344 | struct ref_to_prune *next; | |
2345 | unsigned char sha1[20]; | |
2346 | char name[FLEX_ARRAY]; | |
2347 | }; | |
2348 | ||
2349 | struct pack_refs_cb_data { | |
2350 | unsigned int flags; | |
267f9a8c | 2351 | struct ref_dir *packed_refs; |
32d462ce | 2352 | struct ref_to_prune *ref_to_prune; |
32d462ce MH |
2353 | }; |
2354 | ||
267f9a8c MH |
2355 | /* |
2356 | * An each_ref_entry_fn that is run over loose references only. If | |
2357 | * the loose reference can be packed, add an entry in the packed ref | |
2358 | * cache. If the reference should be pruned, also add it to | |
2359 | * ref_to_prune in the pack_refs_cb_data. | |
2360 | */ | |
2361 | static int pack_if_possible_fn(struct ref_entry *entry, void *cb_data) | |
32d462ce MH |
2362 | { |
2363 | struct pack_refs_cb_data *cb = cb_data; | |
f85354b5 | 2364 | enum peel_status peel_status; |
267f9a8c | 2365 | struct ref_entry *packed_entry; |
59556548 | 2366 | int is_tag_ref = starts_with(entry->name, "refs/tags/"); |
32d462ce | 2367 | |
267f9a8c MH |
2368 | /* ALWAYS pack tags */ |
2369 | if (!(cb->flags & PACK_REFS_ALL) && !is_tag_ref) | |
32d462ce MH |
2370 | return 0; |
2371 | ||
b2a8226d MH |
2372 | /* Do not pack symbolic or broken refs: */ |
2373 | if ((entry->flag & REF_ISSYMREF) || !ref_resolves_to_object(entry)) | |
2374 | return 0; | |
2375 | ||
267f9a8c | 2376 | /* Add a packed ref cache entry equivalent to the loose entry. */ |
f85354b5 | 2377 | peel_status = peel_entry(entry, 1); |
0f29920f | 2378 | if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG) |
f85354b5 MH |
2379 | die("internal error peeling reference %s (%s)", |
2380 | entry->name, sha1_to_hex(entry->u.value.sha1)); | |
267f9a8c MH |
2381 | packed_entry = find_ref(cb->packed_refs, entry->name); |
2382 | if (packed_entry) { | |
2383 | /* Overwrite existing packed entry with info from loose entry */ | |
2384 | packed_entry->flag = REF_ISPACKED | REF_KNOWS_PEELED; | |
2385 | hashcpy(packed_entry->u.value.sha1, entry->u.value.sha1); | |
2386 | } else { | |
2387 | packed_entry = create_ref_entry(entry->name, entry->u.value.sha1, | |
2388 | REF_ISPACKED | REF_KNOWS_PEELED, 0); | |
2389 | add_ref(cb->packed_refs, packed_entry); | |
2390 | } | |
2391 | hashcpy(packed_entry->u.value.peeled, entry->u.value.peeled); | |
32d462ce | 2392 | |
267f9a8c MH |
2393 | /* Schedule the loose reference for pruning if requested. */ |
2394 | if ((cb->flags & PACK_REFS_PRUNE)) { | |
12e77559 | 2395 | int namelen = strlen(entry->name) + 1; |
32d462ce | 2396 | struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen); |
12e77559 MH |
2397 | hashcpy(n->sha1, entry->u.value.sha1); |
2398 | strcpy(n->name, entry->name); | |
32d462ce MH |
2399 | n->next = cb->ref_to_prune; |
2400 | cb->ref_to_prune = n; | |
2401 | } | |
d66da478 MH |
2402 | return 0; |
2403 | } | |
2404 | ||
32d462ce MH |
2405 | /* |
2406 | * Remove empty parents, but spare refs/ and immediate subdirs. | |
2407 | * Note: munges *name. | |
2408 | */ | |
2409 | static void try_remove_empty_parents(char *name) | |
2410 | { | |
2411 | char *p, *q; | |
2412 | int i; | |
2413 | p = name; | |
2414 | for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */ | |
2415 | while (*p && *p != '/') | |
2416 | p++; | |
2417 | /* tolerate duplicate slashes; see check_refname_format() */ | |
2418 | while (*p == '/') | |
2419 | p++; | |
2420 | } | |
2421 | for (q = p; *q; q++) | |
2422 | ; | |
2423 | while (1) { | |
2424 | while (q > p && *q != '/') | |
2425 | q--; | |
2426 | while (q > p && *(q-1) == '/') | |
2427 | q--; | |
2428 | if (q == p) | |
2429 | break; | |
2430 | *q = '\0'; | |
2431 | if (rmdir(git_path("%s", name))) | |
2432 | break; | |
2433 | } | |
2434 | } | |
2435 | ||
2436 | /* make sure nobody touched the ref, and unlink */ | |
2437 | static void prune_ref(struct ref_to_prune *r) | |
2438 | { | |
029cdb4a RS |
2439 | struct ref_transaction *transaction; |
2440 | struct strbuf err = STRBUF_INIT; | |
32d462ce | 2441 | |
88e7dff9 | 2442 | if (check_refname_format(r->name, 0)) |
cba12021 | 2443 | return; |
32d462ce | 2444 | |
029cdb4a RS |
2445 | transaction = ref_transaction_begin(&err); |
2446 | if (!transaction || | |
2447 | ref_transaction_delete(transaction, r->name, r->sha1, | |
2448 | REF_ISPRUNING, 1, &err) || | |
2449 | ref_transaction_commit(transaction, NULL, &err)) { | |
2450 | ref_transaction_free(transaction); | |
2451 | error("%s", err.buf); | |
2452 | strbuf_release(&err); | |
2453 | return; | |
32d462ce | 2454 | } |
029cdb4a RS |
2455 | ref_transaction_free(transaction); |
2456 | strbuf_release(&err); | |
2457 | try_remove_empty_parents(r->name); | |
32d462ce MH |
2458 | } |
2459 | ||
2460 | static void prune_refs(struct ref_to_prune *r) | |
2461 | { | |
2462 | while (r) { | |
2463 | prune_ref(r); | |
2464 | r = r->next; | |
2465 | } | |
2466 | } | |
2467 | ||
32d462ce MH |
2468 | int pack_refs(unsigned int flags) |
2469 | { | |
32d462ce MH |
2470 | struct pack_refs_cb_data cbdata; |
2471 | ||
2472 | memset(&cbdata, 0, sizeof(cbdata)); | |
2473 | cbdata.flags = flags; | |
2474 | ||
9f69d297 | 2475 | lock_packed_refs(LOCK_DIE_ON_ERROR); |
267f9a8c | 2476 | cbdata.packed_refs = get_packed_refs(&ref_cache); |
32d462ce | 2477 | |
267f9a8c MH |
2478 | do_for_each_entry_in_dir(get_loose_refs(&ref_cache), 0, |
2479 | pack_if_possible_fn, &cbdata); | |
32d462ce | 2480 | |
9f69d297 | 2481 | if (commit_packed_refs()) |
32d462ce | 2482 | die_errno("unable to overwrite old ref-pack file"); |
9f69d297 | 2483 | |
32d462ce MH |
2484 | prune_refs(cbdata.ref_to_prune); |
2485 | return 0; | |
2486 | } | |
2487 | ||
7b40d396 MH |
2488 | /* |
2489 | * If entry is no longer needed in packed-refs, add it to the string | |
2490 | * list pointed to by cb_data. Reasons for deleting entries: | |
2491 | * | |
2492 | * - Entry is broken. | |
2493 | * - Entry is overridden by a loose ref. | |
2494 | * - Entry does not point at a valid object. | |
2495 | * | |
2496 | * In the first and third cases, also emit an error message because these | |
2497 | * are indications of repository corruption. | |
2498 | */ | |
2499 | static int curate_packed_ref_fn(struct ref_entry *entry, void *cb_data) | |
c0277d15 | 2500 | { |
7b40d396 | 2501 | struct string_list *refs_to_delete = cb_data; |
fec3137f | 2502 | |
ab292bc4 MH |
2503 | if (entry->flag & REF_ISBROKEN) { |
2504 | /* This shouldn't happen to packed refs. */ | |
2505 | error("%s is broken!", entry->name); | |
7b40d396 | 2506 | string_list_append(refs_to_delete, entry->name); |
c0277d15 | 2507 | return 0; |
ab292bc4 MH |
2508 | } |
2509 | if (!has_sha1_file(entry->u.value.sha1)) { | |
2510 | unsigned char sha1[20]; | |
2511 | int flags; | |
2512 | ||
2513 | if (read_ref_full(entry->name, sha1, 0, &flags)) | |
2514 | /* We should at least have found the packed ref. */ | |
2515 | die("Internal error"); | |
7b40d396 | 2516 | if ((flags & REF_ISSYMREF) || !(flags & REF_ISPACKED)) { |
ab292bc4 MH |
2517 | /* |
2518 | * This packed reference is overridden by a | |
2519 | * loose reference, so it is OK that its value | |
2520 | * is no longer valid; for example, it might | |
2521 | * refer to an object that has been garbage | |
2522 | * collected. For this purpose we don't even | |
2523 | * care whether the loose reference itself is | |
2524 | * invalid, broken, symbolic, etc. Silently | |
7b40d396 | 2525 | * remove the packed reference. |
ab292bc4 | 2526 | */ |
7b40d396 | 2527 | string_list_append(refs_to_delete, entry->name); |
ab292bc4 | 2528 | return 0; |
7b40d396 | 2529 | } |
ab292bc4 MH |
2530 | /* |
2531 | * There is no overriding loose reference, so the fact | |
2532 | * that this reference doesn't refer to a valid object | |
2533 | * indicates some kind of repository corruption. | |
2534 | * Report the problem, then omit the reference from | |
2535 | * the output. | |
2536 | */ | |
2537 | error("%s does not point to a valid object!", entry->name); | |
7b40d396 | 2538 | string_list_append(refs_to_delete, entry->name); |
ab292bc4 MH |
2539 | return 0; |
2540 | } | |
2541 | ||
d66da478 MH |
2542 | return 0; |
2543 | } | |
2544 | ||
60bca085 | 2545 | int repack_without_refs(const char **refnames, int n, struct strbuf *err) |
c0277d15 | 2546 | { |
7618fd80 | 2547 | struct ref_dir *packed; |
7b40d396 MH |
2548 | struct string_list refs_to_delete = STRING_LIST_INIT_DUP; |
2549 | struct string_list_item *ref_to_delete; | |
60bca085 | 2550 | int i, ret, removed = 0; |
61cee0db BK |
2551 | |
2552 | /* Look for a packed ref */ | |
2553 | for (i = 0; i < n; i++) | |
2554 | if (get_packed_ref(refnames[i])) | |
2555 | break; | |
7618fd80 | 2556 | |
61cee0db BK |
2557 | /* Avoid locking if we have nothing to do */ |
2558 | if (i == n) | |
2559 | return 0; /* no refname exists in packed refs */ | |
7618fd80 | 2560 | |
9f69d297 | 2561 | if (lock_packed_refs(0)) { |
60bca085 RS |
2562 | if (err) { |
2563 | unable_to_lock_message(git_path("packed-refs"), errno, | |
2564 | err); | |
2565 | return -1; | |
2566 | } | |
1b018fd9 | 2567 | unable_to_lock_error(git_path("packed-refs"), errno); |
61cee0db | 2568 | return error("cannot delete '%s' from packed refs", refnames[i]); |
1b018fd9 | 2569 | } |
9da31cb0 | 2570 | packed = get_packed_refs(&ref_cache); |
7b40d396 | 2571 | |
61cee0db BK |
2572 | /* Remove refnames from the cache */ |
2573 | for (i = 0; i < n; i++) | |
2574 | if (remove_entry(packed, refnames[i]) != -1) | |
2575 | removed = 1; | |
2576 | if (!removed) { | |
506a760d | 2577 | /* |
61cee0db | 2578 | * All packed entries disappeared while we were |
506a760d MH |
2579 | * acquiring the lock. |
2580 | */ | |
9f69d297 | 2581 | rollback_packed_refs(); |
506a760d MH |
2582 | return 0; |
2583 | } | |
7b40d396 | 2584 | |
61cee0db | 2585 | /* Remove any other accumulated cruft */ |
7b40d396 MH |
2586 | do_for_each_entry_in_dir(packed, 0, curate_packed_ref_fn, &refs_to_delete); |
2587 | for_each_string_list_item(ref_to_delete, &refs_to_delete) { | |
2588 | if (remove_entry(packed, ref_to_delete->string) == -1) | |
2589 | die("internal error"); | |
2590 | } | |
2591 | ||
61cee0db | 2592 | /* Write what remains */ |
60bca085 RS |
2593 | ret = commit_packed_refs(); |
2594 | if (ret && err) | |
2595 | strbuf_addf(err, "unable to overwrite old ref-pack file: %s", | |
2596 | strerror(errno)); | |
2597 | return ret; | |
c0277d15 JH |
2598 | } |
2599 | ||
2ddb5d17 BK |
2600 | static int delete_ref_loose(struct ref_lock *lock, int flag) |
2601 | { | |
045a476f | 2602 | if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) { |
91f1f191 MH |
2603 | /* |
2604 | * loose. The loose file name is the same as the | |
2605 | * lockfile name, minus ".lock": | |
2606 | */ | |
ec38b4e4 | 2607 | char *loose_filename = get_locked_file_path(lock->lk); |
91f1f191 MH |
2608 | int err = unlink_or_warn(loose_filename); |
2609 | free(loose_filename); | |
2ddb5d17 BK |
2610 | if (err && errno != ENOENT) |
2611 | return 1; | |
c0277d15 | 2612 | } |
2ddb5d17 BK |
2613 | return 0; |
2614 | } | |
2615 | ||
eca35a25 | 2616 | int delete_ref(const char *refname, const unsigned char *sha1, int delopt) |
c0277d15 | 2617 | { |
7521cc46 RS |
2618 | struct ref_transaction *transaction; |
2619 | struct strbuf err = STRBUF_INIT; | |
c0277d15 | 2620 | |
7521cc46 RS |
2621 | transaction = ref_transaction_begin(&err); |
2622 | if (!transaction || | |
2623 | ref_transaction_delete(transaction, refname, sha1, delopt, | |
2624 | sha1 && !is_null_sha1(sha1), &err) || | |
2625 | ref_transaction_commit(transaction, NULL, &err)) { | |
2626 | error("%s", err.buf); | |
2627 | ref_transaction_free(transaction); | |
2628 | strbuf_release(&err); | |
c0277d15 | 2629 | return 1; |
7521cc46 RS |
2630 | } |
2631 | ref_transaction_free(transaction); | |
2632 | strbuf_release(&err); | |
2633 | return 0; | |
4bd18c43 SP |
2634 | } |
2635 | ||
765c2258 PH |
2636 | /* |
2637 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
2638 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
2639 | * | |
2640 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
2641 | * live into logs/refs. | |
2642 | */ | |
2643 | #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log" | |
2644 | ||
fa59ae79 MH |
2645 | static int rename_tmp_log(const char *newrefname) |
2646 | { | |
f1e9e9a4 | 2647 | int attempts_remaining = 4; |
ae4a283e MH |
2648 | |
2649 | retry: | |
08f555cb MH |
2650 | switch (safe_create_leading_directories(git_path("logs/%s", newrefname))) { |
2651 | case SCLD_OK: | |
2652 | break; /* success */ | |
2653 | case SCLD_VANISHED: | |
2654 | if (--attempts_remaining > 0) | |
2655 | goto retry; | |
2656 | /* fall through */ | |
2657 | default: | |
fa59ae79 MH |
2658 | error("unable to create directory for %s", newrefname); |
2659 | return -1; | |
2660 | } | |
2661 | ||
fa59ae79 | 2662 | if (rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname))) { |
f1e9e9a4 | 2663 | if ((errno==EISDIR || errno==ENOTDIR) && --attempts_remaining > 0) { |
fa59ae79 MH |
2664 | /* |
2665 | * rename(a, b) when b is an existing | |
2666 | * directory ought to result in ISDIR, but | |
2667 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
2668 | */ | |
2669 | if (remove_empty_directories(git_path("logs/%s", newrefname))) { | |
2670 | error("Directory not empty: logs/%s", newrefname); | |
2671 | return -1; | |
2672 | } | |
2673 | goto retry; | |
ae4a283e MH |
2674 | } else if (errno == ENOENT && --attempts_remaining > 0) { |
2675 | /* | |
2676 | * Maybe another process just deleted one of | |
2677 | * the directories in the path to newrefname. | |
2678 | * Try again from the beginning. | |
2679 | */ | |
2680 | goto retry; | |
fa59ae79 MH |
2681 | } else { |
2682 | error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s", | |
2683 | newrefname, strerror(errno)); | |
2684 | return -1; | |
2685 | } | |
2686 | } | |
2687 | return 0; | |
2688 | } | |
2689 | ||
dfefa935 | 2690 | int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg) |
c976d415 | 2691 | { |
c976d415 LH |
2692 | unsigned char sha1[20], orig_sha1[20]; |
2693 | int flag = 0, logmoved = 0; | |
2694 | struct ref_lock *lock; | |
c976d415 | 2695 | struct stat loginfo; |
dfefa935 | 2696 | int log = !lstat(git_path("logs/%s", oldrefname), &loginfo); |
eca35a25 | 2697 | const char *symref = NULL; |
c976d415 | 2698 | |
450d4c0f | 2699 | if (log && S_ISLNK(loginfo.st_mode)) |
dfefa935 | 2700 | return error("reflog for %s is a symlink", oldrefname); |
c976d415 | 2701 | |
8d68493f | 2702 | symref = resolve_ref_unsafe(oldrefname, orig_sha1, 1, &flag); |
eca35a25 | 2703 | if (flag & REF_ISSYMREF) |
fa58186c | 2704 | return error("refname %s is a symbolic ref, renaming it is not supported", |
dfefa935 | 2705 | oldrefname); |
eca35a25 | 2706 | if (!symref) |
dfefa935 | 2707 | return error("refname %s not found", oldrefname); |
c976d415 | 2708 | |
9da31cb0 | 2709 | if (!is_refname_available(newrefname, oldrefname, get_packed_refs(&ref_cache))) |
c976d415 LH |
2710 | return 1; |
2711 | ||
9da31cb0 | 2712 | if (!is_refname_available(newrefname, oldrefname, get_loose_refs(&ref_cache))) |
c976d415 LH |
2713 | return 1; |
2714 | ||
dfefa935 | 2715 | if (log && rename(git_path("logs/%s", oldrefname), git_path(TMP_RENAMED_LOG))) |
765c2258 | 2716 | return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s", |
dfefa935 | 2717 | oldrefname, strerror(errno)); |
c976d415 | 2718 | |
dfefa935 MH |
2719 | if (delete_ref(oldrefname, orig_sha1, REF_NODEREF)) { |
2720 | error("unable to delete old %s", oldrefname); | |
c976d415 LH |
2721 | goto rollback; |
2722 | } | |
2723 | ||
dfefa935 MH |
2724 | if (!read_ref_full(newrefname, sha1, 1, &flag) && |
2725 | delete_ref(newrefname, sha1, REF_NODEREF)) { | |
c976d415 | 2726 | if (errno==EISDIR) { |
dfefa935 MH |
2727 | if (remove_empty_directories(git_path("%s", newrefname))) { |
2728 | error("Directory not empty: %s", newrefname); | |
c976d415 LH |
2729 | goto rollback; |
2730 | } | |
2731 | } else { | |
dfefa935 | 2732 | error("unable to delete existing %s", newrefname); |
c976d415 LH |
2733 | goto rollback; |
2734 | } | |
2735 | } | |
2736 | ||
fa59ae79 | 2737 | if (log && rename_tmp_log(newrefname)) |
c976d415 | 2738 | goto rollback; |
c976d415 | 2739 | |
c976d415 LH |
2740 | logmoved = log; |
2741 | ||
dfefa935 | 2742 | lock = lock_ref_sha1_basic(newrefname, NULL, 0, NULL); |
c976d415 | 2743 | if (!lock) { |
dfefa935 | 2744 | error("unable to lock %s for update", newrefname); |
c976d415 LH |
2745 | goto rollback; |
2746 | } | |
c976d415 LH |
2747 | lock->force_write = 1; |
2748 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 2749 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
dfefa935 | 2750 | error("unable to write current sha1 into %s", newrefname); |
c976d415 LH |
2751 | goto rollback; |
2752 | } | |
2753 | ||
2754 | return 0; | |
2755 | ||
2756 | rollback: | |
dfefa935 | 2757 | lock = lock_ref_sha1_basic(oldrefname, NULL, 0, NULL); |
c976d415 | 2758 | if (!lock) { |
dfefa935 | 2759 | error("unable to lock %s for rollback", oldrefname); |
c976d415 LH |
2760 | goto rollbacklog; |
2761 | } | |
2762 | ||
2763 | lock->force_write = 1; | |
2764 | flag = log_all_ref_updates; | |
2765 | log_all_ref_updates = 0; | |
2766 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
dfefa935 | 2767 | error("unable to write current sha1 into %s", oldrefname); |
c976d415 LH |
2768 | log_all_ref_updates = flag; |
2769 | ||
2770 | rollbacklog: | |
dfefa935 | 2771 | if (logmoved && rename(git_path("logs/%s", newrefname), git_path("logs/%s", oldrefname))) |
c976d415 | 2772 | error("unable to restore logfile %s from %s: %s", |
dfefa935 | 2773 | oldrefname, newrefname, strerror(errno)); |
c976d415 | 2774 | if (!logmoved && log && |
dfefa935 | 2775 | rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldrefname))) |
765c2258 | 2776 | error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s", |
dfefa935 | 2777 | oldrefname, strerror(errno)); |
c976d415 LH |
2778 | |
2779 | return 1; | |
2780 | } | |
2781 | ||
435fc852 | 2782 | int close_ref(struct ref_lock *lock) |
b531394d BC |
2783 | { |
2784 | if (close_lock_file(lock->lk)) | |
2785 | return -1; | |
2786 | lock->lock_fd = -1; | |
2787 | return 0; | |
2788 | } | |
2789 | ||
435fc852 | 2790 | int commit_ref(struct ref_lock *lock) |
b531394d BC |
2791 | { |
2792 | if (commit_lock_file(lock->lk)) | |
2793 | return -1; | |
2794 | lock->lock_fd = -1; | |
2795 | return 0; | |
2796 | } | |
2797 | ||
e5f38ec3 | 2798 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 | 2799 | { |
4ed7cd3a BC |
2800 | /* Do not free lock->lk -- atexit() still looks at them */ |
2801 | if (lock->lk) | |
2802 | rollback_lock_file(lock->lk); | |
434cd0cd | 2803 | free(lock->ref_name); |
1655707c | 2804 | free(lock->orig_ref_name); |
4bd18c43 SP |
2805 | free(lock); |
2806 | } | |
2807 | ||
0ec29a47 JH |
2808 | /* |
2809 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
2810 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
2811 | * because reflog file is one line per entry. | |
2812 | */ | |
2813 | static int copy_msg(char *buf, const char *msg) | |
2814 | { | |
2815 | char *cp = buf; | |
2816 | char c; | |
2817 | int wasspace = 1; | |
2818 | ||
2819 | *cp++ = '\t'; | |
2820 | while ((c = *msg++)) { | |
2821 | if (wasspace && isspace(c)) | |
2822 | continue; | |
2823 | wasspace = isspace(c); | |
2824 | if (wasspace) | |
2825 | c = ' '; | |
2826 | *cp++ = c; | |
2827 | } | |
2828 | while (buf < cp && isspace(cp[-1])) | |
2829 | cp--; | |
2830 | *cp++ = '\n'; | |
2831 | return cp - buf; | |
2832 | } | |
2833 | ||
bd3b02da | 2834 | /* This function must set a meaningful errno on failure */ |
dfefa935 | 2835 | int log_ref_setup(const char *refname, char *logfile, int bufsize) |
6de08ae6 | 2836 | { |
859c3017 | 2837 | int logfd, oflags = O_APPEND | O_WRONLY; |
9a13f0b7 | 2838 | |
dfefa935 | 2839 | git_snpath(logfile, bufsize, "logs/%s", refname); |
4057deb5 | 2840 | if (log_all_ref_updates && |
59556548 CC |
2841 | (starts_with(refname, "refs/heads/") || |
2842 | starts_with(refname, "refs/remotes/") || | |
2843 | starts_with(refname, "refs/notes/") || | |
dfefa935 | 2844 | !strcmp(refname, "HEAD"))) { |
bd3b02da RS |
2845 | if (safe_create_leading_directories(logfile) < 0) { |
2846 | int save_errno = errno; | |
2847 | error("unable to create directory for %s", logfile); | |
2848 | errno = save_errno; | |
2849 | return -1; | |
2850 | } | |
6de08ae6 SP |
2851 | oflags |= O_CREAT; |
2852 | } | |
2853 | ||
157aaea5 | 2854 | logfd = open(logfile, oflags, 0666); |
6de08ae6 | 2855 | if (logfd < 0) { |
1974bf62 | 2856 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 2857 | return 0; |
3b463c3f JH |
2858 | |
2859 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
157aaea5 | 2860 | if (remove_empty_directories(logfile)) { |
bd3b02da RS |
2861 | int save_errno = errno; |
2862 | error("There are still logs under '%s'", | |
2863 | logfile); | |
2864 | errno = save_errno; | |
2865 | return -1; | |
3b463c3f | 2866 | } |
157aaea5 | 2867 | logfd = open(logfile, oflags, 0666); |
3b463c3f JH |
2868 | } |
2869 | ||
bd3b02da RS |
2870 | if (logfd < 0) { |
2871 | int save_errno = errno; | |
2872 | error("Unable to append to %s: %s", logfile, | |
2873 | strerror(errno)); | |
2874 | errno = save_errno; | |
2875 | return -1; | |
2876 | } | |
6de08ae6 SP |
2877 | } |
2878 | ||
157aaea5 | 2879 | adjust_shared_perm(logfile); |
859c3017 EM |
2880 | close(logfd); |
2881 | return 0; | |
2882 | } | |
443b92b6 | 2883 | |
dfefa935 | 2884 | static int log_ref_write(const char *refname, const unsigned char *old_sha1, |
859c3017 EM |
2885 | const unsigned char *new_sha1, const char *msg) |
2886 | { | |
2887 | int logfd, result, written, oflags = O_APPEND | O_WRONLY; | |
2888 | unsigned maxlen, len; | |
2889 | int msglen; | |
157aaea5 | 2890 | char log_file[PATH_MAX]; |
859c3017 EM |
2891 | char *logrec; |
2892 | const char *committer; | |
2893 | ||
2894 | if (log_all_ref_updates < 0) | |
2895 | log_all_ref_updates = !is_bare_repository(); | |
2896 | ||
dfefa935 | 2897 | result = log_ref_setup(refname, log_file, sizeof(log_file)); |
859c3017 EM |
2898 | if (result) |
2899 | return result; | |
2900 | ||
2901 | logfd = open(log_file, oflags); | |
2902 | if (logfd < 0) | |
2903 | return 0; | |
0ec29a47 | 2904 | msglen = msg ? strlen(msg) : 0; |
774751a8 | 2905 | committer = git_committer_info(0); |
8ac65937 JH |
2906 | maxlen = strlen(committer) + msglen + 100; |
2907 | logrec = xmalloc(maxlen); | |
2908 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
2909 | sha1_to_hex(old_sha1), |
2910 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
2911 | committer); |
2912 | if (msglen) | |
0ec29a47 | 2913 | len += copy_msg(logrec + len - 1, msg) - 1; |
93822c22 | 2914 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 | 2915 | free(logrec); |
dc615de8 RS |
2916 | if (written != len) { |
2917 | int save_errno = errno; | |
2918 | close(logfd); | |
2919 | error("Unable to append to %s", log_file); | |
2920 | errno = save_errno; | |
2921 | return -1; | |
2922 | } | |
2923 | if (close(logfd)) { | |
2924 | int save_errno = errno; | |
2925 | error("Unable to append to %s", log_file); | |
2926 | errno = save_errno; | |
2927 | return -1; | |
2928 | } | |
6de08ae6 SP |
2929 | return 0; |
2930 | } | |
2931 | ||
e7e0f26e | 2932 | int is_branch(const char *refname) |
c3b0dec5 | 2933 | { |
59556548 | 2934 | return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/"); |
c3b0dec5 LT |
2935 | } |
2936 | ||
dc615de8 | 2937 | /* This function must return a meaningful errno */ |
4bd18c43 SP |
2938 | int write_ref_sha1(struct ref_lock *lock, |
2939 | const unsigned char *sha1, const char *logmsg) | |
2940 | { | |
2941 | static char term = '\n'; | |
c3b0dec5 | 2942 | struct object *o; |
4bd18c43 | 2943 | |
dc615de8 RS |
2944 | if (!lock) { |
2945 | errno = EINVAL; | |
95fc7512 | 2946 | return -1; |
dc615de8 | 2947 | } |
a89fccd2 | 2948 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
2949 | unlock_ref(lock); |
2950 | return 0; | |
95fc7512 | 2951 | } |
c3b0dec5 LT |
2952 | o = parse_object(sha1); |
2953 | if (!o) { | |
7be8b3ba | 2954 | error("Trying to write ref %s with nonexistent object %s", |
c3b0dec5 LT |
2955 | lock->ref_name, sha1_to_hex(sha1)); |
2956 | unlock_ref(lock); | |
dc615de8 | 2957 | errno = EINVAL; |
c3b0dec5 LT |
2958 | return -1; |
2959 | } | |
2960 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
2961 | error("Trying to write non-commit object %s to branch %s", | |
2962 | sha1_to_hex(sha1), lock->ref_name); | |
2963 | unlock_ref(lock); | |
dc615de8 | 2964 | errno = EINVAL; |
c3b0dec5 LT |
2965 | return -1; |
2966 | } | |
93822c22 | 2967 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
dc615de8 RS |
2968 | write_in_full(lock->lock_fd, &term, 1) != 1 || |
2969 | close_ref(lock) < 0) { | |
2970 | int save_errno = errno; | |
cf6950d3 | 2971 | error("Couldn't write %s", lock->lk->filename.buf); |
4bd18c43 | 2972 | unlock_ref(lock); |
dc615de8 | 2973 | errno = save_errno; |
4bd18c43 SP |
2974 | return -1; |
2975 | } | |
9da31cb0 | 2976 | clear_loose_ref_cache(&ref_cache); |
bd104db1 NP |
2977 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
2978 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
2979 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
2980 | unlock_ref(lock); |
2981 | return -1; | |
2982 | } | |
605fac8b NP |
2983 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
2984 | /* | |
2985 | * Special hack: If a branch is updated directly and HEAD | |
2986 | * points to it (may happen on the remote side of a push | |
2987 | * for example) then logically the HEAD reflog should be | |
2988 | * updated too. | |
2989 | * A generic solution implies reverse symref information, | |
2990 | * but finding all symrefs pointing to the given branch | |
2991 | * would be rather costly for this rare event (the direct | |
2992 | * update of a branch) to be worth it. So let's cheat and | |
2993 | * check with HEAD only which should cover 99% of all usage | |
2994 | * scenarios (even 100% of the default ones). | |
2995 | */ | |
2996 | unsigned char head_sha1[20]; | |
2997 | int head_flag; | |
2998 | const char *head_ref; | |
8cad4744 | 2999 | head_ref = resolve_ref_unsafe("HEAD", head_sha1, 1, &head_flag); |
605fac8b NP |
3000 | if (head_ref && (head_flag & REF_ISSYMREF) && |
3001 | !strcmp(head_ref, lock->ref_name)) | |
3002 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
3003 | } | |
b531394d | 3004 | if (commit_ref(lock)) { |
434cd0cd | 3005 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
3006 | unlock_ref(lock); |
3007 | return -1; | |
3008 | } | |
4bd18c43 SP |
3009 | unlock_ref(lock); |
3010 | return 0; | |
95fc7512 | 3011 | } |
d556fae2 | 3012 | |
8b5157e4 NP |
3013 | int create_symref(const char *ref_target, const char *refs_heads_master, |
3014 | const char *logmsg) | |
41b625b0 NP |
3015 | { |
3016 | const char *lockpath; | |
3017 | char ref[1000]; | |
3018 | int fd, len, written; | |
a4f34cbb | 3019 | char *git_HEAD = git_pathdup("%s", ref_target); |
8b5157e4 NP |
3020 | unsigned char old_sha1[20], new_sha1[20]; |
3021 | ||
3022 | if (logmsg && read_ref(ref_target, old_sha1)) | |
3023 | hashclr(old_sha1); | |
41b625b0 | 3024 | |
d48744d1 JH |
3025 | if (safe_create_leading_directories(git_HEAD) < 0) |
3026 | return error("unable to create directory for %s", git_HEAD); | |
3027 | ||
41b625b0 NP |
3028 | #ifndef NO_SYMLINK_HEAD |
3029 | if (prefer_symlink_refs) { | |
3030 | unlink(git_HEAD); | |
3031 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 3032 | goto done; |
41b625b0 NP |
3033 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
3034 | } | |
3035 | #endif | |
3036 | ||
3037 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
3038 | if (sizeof(ref) <= len) { | |
3039 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 3040 | goto error_free_return; |
41b625b0 NP |
3041 | } |
3042 | lockpath = mkpath("%s.lock", git_HEAD); | |
3043 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
3044 | if (fd < 0) { | |
3045 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 3046 | goto error_free_return; |
41b625b0 NP |
3047 | } |
3048 | written = write_in_full(fd, ref, len); | |
91c8d590 | 3049 | if (close(fd) != 0 || written != len) { |
41b625b0 | 3050 | error("Unable to write to %s", lockpath); |
47fc52e2 | 3051 | goto error_unlink_return; |
41b625b0 NP |
3052 | } |
3053 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 3054 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 3055 | goto error_unlink_return; |
41b625b0 NP |
3056 | } |
3057 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 3058 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 | 3059 | error_unlink_return: |
691f1a28 | 3060 | unlink_or_warn(lockpath); |
47fc52e2 JH |
3061 | error_free_return: |
3062 | free(git_HEAD); | |
3063 | return -1; | |
41b625b0 | 3064 | } |
8b5157e4 | 3065 | |
ee96d11b | 3066 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 3067 | done: |
ee96d11b | 3068 | #endif |
8b5157e4 NP |
3069 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
3070 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
3071 | ||
47fc52e2 | 3072 | free(git_HEAD); |
41b625b0 NP |
3073 | return 0; |
3074 | } | |
3075 | ||
4207ed28 RS |
3076 | struct read_ref_at_cb { |
3077 | const char *refname; | |
3078 | unsigned long at_time; | |
3079 | int cnt; | |
3080 | int reccnt; | |
3081 | unsigned char *sha1; | |
3082 | int found_it; | |
3083 | ||
3084 | unsigned char osha1[20]; | |
3085 | unsigned char nsha1[20]; | |
3086 | int tz; | |
3087 | unsigned long date; | |
3088 | char **msg; | |
3089 | unsigned long *cutoff_time; | |
3090 | int *cutoff_tz; | |
3091 | int *cutoff_cnt; | |
3092 | }; | |
3093 | ||
3094 | static int read_ref_at_ent(unsigned char *osha1, unsigned char *nsha1, | |
3095 | const char *email, unsigned long timestamp, int tz, | |
3096 | const char *message, void *cb_data) | |
3097 | { | |
3098 | struct read_ref_at_cb *cb = cb_data; | |
3099 | ||
3100 | cb->reccnt++; | |
3101 | cb->tz = tz; | |
3102 | cb->date = timestamp; | |
3103 | ||
3104 | if (timestamp <= cb->at_time || cb->cnt == 0) { | |
3105 | if (cb->msg) | |
3106 | *cb->msg = xstrdup(message); | |
3107 | if (cb->cutoff_time) | |
3108 | *cb->cutoff_time = timestamp; | |
3109 | if (cb->cutoff_tz) | |
3110 | *cb->cutoff_tz = tz; | |
3111 | if (cb->cutoff_cnt) | |
3112 | *cb->cutoff_cnt = cb->reccnt - 1; | |
3113 | /* | |
3114 | * we have not yet updated cb->[n|o]sha1 so they still | |
3115 | * hold the values for the previous record. | |
3116 | */ | |
3117 | if (!is_null_sha1(cb->osha1)) { | |
3118 | hashcpy(cb->sha1, nsha1); | |
3119 | if (hashcmp(cb->osha1, nsha1)) | |
3120 | warning("Log for ref %s has gap after %s.", | |
3121 | cb->refname, show_date(cb->date, cb->tz, DATE_RFC2822)); | |
3122 | } | |
3123 | else if (cb->date == cb->at_time) | |
3124 | hashcpy(cb->sha1, nsha1); | |
3125 | else if (hashcmp(nsha1, cb->sha1)) | |
3126 | warning("Log for ref %s unexpectedly ended on %s.", | |
3127 | cb->refname, show_date(cb->date, cb->tz, | |
3128 | DATE_RFC2822)); | |
3129 | hashcpy(cb->osha1, osha1); | |
3130 | hashcpy(cb->nsha1, nsha1); | |
3131 | cb->found_it = 1; | |
3132 | return 1; | |
3133 | } | |
3134 | hashcpy(cb->osha1, osha1); | |
3135 | hashcpy(cb->nsha1, nsha1); | |
3136 | if (cb->cnt > 0) | |
3137 | cb->cnt--; | |
3138 | return 0; | |
3139 | } | |
3140 | ||
3141 | static int read_ref_at_ent_oldest(unsigned char *osha1, unsigned char *nsha1, | |
3142 | const char *email, unsigned long timestamp, | |
3143 | int tz, const char *message, void *cb_data) | |
3144 | { | |
3145 | struct read_ref_at_cb *cb = cb_data; | |
3146 | ||
3147 | if (cb->msg) | |
3148 | *cb->msg = xstrdup(message); | |
3149 | if (cb->cutoff_time) | |
3150 | *cb->cutoff_time = timestamp; | |
3151 | if (cb->cutoff_tz) | |
3152 | *cb->cutoff_tz = tz; | |
3153 | if (cb->cutoff_cnt) | |
3154 | *cb->cutoff_cnt = cb->reccnt; | |
3155 | hashcpy(cb->sha1, osha1); | |
3156 | if (is_null_sha1(cb->sha1)) | |
3157 | hashcpy(cb->sha1, nsha1); | |
3158 | /* We just want the first entry */ | |
3159 | return 1; | |
16d7cc90 JH |
3160 | } |
3161 | ||
c41a87dd | 3162 | int read_ref_at(const char *refname, unsigned int flags, unsigned long at_time, int cnt, |
dfefa935 MH |
3163 | unsigned char *sha1, char **msg, |
3164 | unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt) | |
d556fae2 | 3165 | { |
4207ed28 | 3166 | struct read_ref_at_cb cb; |
d556fae2 | 3167 | |
4207ed28 RS |
3168 | memset(&cb, 0, sizeof(cb)); |
3169 | cb.refname = refname; | |
3170 | cb.at_time = at_time; | |
3171 | cb.cnt = cnt; | |
3172 | cb.msg = msg; | |
3173 | cb.cutoff_time = cutoff_time; | |
3174 | cb.cutoff_tz = cutoff_tz; | |
3175 | cb.cutoff_cnt = cutoff_cnt; | |
3176 | cb.sha1 = sha1; | |
3177 | ||
3178 | for_each_reflog_ent_reverse(refname, read_ref_at_ent, &cb); | |
3179 | ||
c41a87dd DA |
3180 | if (!cb.reccnt) { |
3181 | if (flags & GET_SHA1_QUIETLY) | |
3182 | exit(128); | |
3183 | else | |
3184 | die("Log for %s is empty.", refname); | |
3185 | } | |
4207ed28 RS |
3186 | if (cb.found_it) |
3187 | return 0; | |
3188 | ||
3189 | for_each_reflog_ent(refname, read_ref_at_ent_oldest, &cb); | |
d556fae2 | 3190 | |
16d7cc90 | 3191 | return 1; |
d556fae2 | 3192 | } |
2ff81662 | 3193 | |
4da58835 RS |
3194 | int reflog_exists(const char *refname) |
3195 | { | |
3196 | struct stat st; | |
3197 | ||
3198 | return !lstat(git_path("logs/%s", refname), &st) && | |
3199 | S_ISREG(st.st_mode); | |
3200 | } | |
3201 | ||
3202 | int delete_reflog(const char *refname) | |
3203 | { | |
3204 | return remove_path(git_path("logs/%s", refname)); | |
3205 | } | |
3206 | ||
9a7a183b JH |
3207 | static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data) |
3208 | { | |
3209 | unsigned char osha1[20], nsha1[20]; | |
3210 | char *email_end, *message; | |
3211 | unsigned long timestamp; | |
3212 | int tz; | |
3213 | ||
3214 | /* old SP new SP name <email> SP time TAB msg LF */ | |
3215 | if (sb->len < 83 || sb->buf[sb->len - 1] != '\n' || | |
3216 | get_sha1_hex(sb->buf, osha1) || sb->buf[40] != ' ' || | |
3217 | get_sha1_hex(sb->buf + 41, nsha1) || sb->buf[81] != ' ' || | |
3218 | !(email_end = strchr(sb->buf + 82, '>')) || | |
3219 | email_end[1] != ' ' || | |
3220 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
3221 | !message || message[0] != ' ' || | |
3222 | (message[1] != '+' && message[1] != '-') || | |
3223 | !isdigit(message[2]) || !isdigit(message[3]) || | |
3224 | !isdigit(message[4]) || !isdigit(message[5])) | |
3225 | return 0; /* corrupt? */ | |
3226 | email_end[1] = '\0'; | |
3227 | tz = strtol(message + 1, NULL, 10); | |
3228 | if (message[6] != '\t') | |
3229 | message += 6; | |
3230 | else | |
3231 | message += 7; | |
3232 | return fn(osha1, nsha1, sb->buf + 82, timestamp, tz, message, cb_data); | |
3233 | } | |
3234 | ||
98f85ff4 JH |
3235 | static char *find_beginning_of_line(char *bob, char *scan) |
3236 | { | |
3237 | while (bob < scan && *(--scan) != '\n') | |
3238 | ; /* keep scanning backwards */ | |
3239 | /* | |
3240 | * Return either beginning of the buffer, or LF at the end of | |
3241 | * the previous line. | |
3242 | */ | |
3243 | return scan; | |
3244 | } | |
3245 | ||
3246 | int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void *cb_data) | |
2ff81662 | 3247 | { |
8ca78803 | 3248 | struct strbuf sb = STRBUF_INIT; |
98f85ff4 JH |
3249 | FILE *logfp; |
3250 | long pos; | |
3251 | int ret = 0, at_tail = 1; | |
2ff81662 | 3252 | |
7ae07c1b | 3253 | logfp = fopen(git_path("logs/%s", refname), "r"); |
2ff81662 | 3254 | if (!logfp) |
883d60fa | 3255 | return -1; |
101d15e0 | 3256 | |
98f85ff4 JH |
3257 | /* Jump to the end */ |
3258 | if (fseek(logfp, 0, SEEK_END) < 0) | |
3259 | return error("cannot seek back reflog for %s: %s", | |
3260 | refname, strerror(errno)); | |
3261 | pos = ftell(logfp); | |
3262 | while (!ret && 0 < pos) { | |
3263 | int cnt; | |
3264 | size_t nread; | |
3265 | char buf[BUFSIZ]; | |
3266 | char *endp, *scanp; | |
3267 | ||
3268 | /* Fill next block from the end */ | |
3269 | cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos; | |
3270 | if (fseek(logfp, pos - cnt, SEEK_SET)) | |
3271 | return error("cannot seek back reflog for %s: %s", | |
3272 | refname, strerror(errno)); | |
3273 | nread = fread(buf, cnt, 1, logfp); | |
e4ca819a | 3274 | if (nread != 1) |
98f85ff4 JH |
3275 | return error("cannot read %d bytes from reflog for %s: %s", |
3276 | cnt, refname, strerror(errno)); | |
3277 | pos -= cnt; | |
3278 | ||
3279 | scanp = endp = buf + cnt; | |
3280 | if (at_tail && scanp[-1] == '\n') | |
3281 | /* Looking at the final LF at the end of the file */ | |
3282 | scanp--; | |
3283 | at_tail = 0; | |
3284 | ||
3285 | while (buf < scanp) { | |
3286 | /* | |
3287 | * terminating LF of the previous line, or the beginning | |
3288 | * of the buffer. | |
3289 | */ | |
3290 | char *bp; | |
3291 | ||
3292 | bp = find_beginning_of_line(buf, scanp); | |
3293 | ||
3294 | if (*bp != '\n') { | |
3295 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
3296 | if (pos) | |
3297 | break; /* need to fill another block */ | |
3298 | scanp = buf - 1; /* leave loop */ | |
3299 | } else { | |
3300 | /* | |
3301 | * (bp + 1) thru endp is the beginning of the | |
3302 | * current line we have in sb | |
3303 | */ | |
3304 | strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1)); | |
3305 | scanp = bp; | |
3306 | endp = bp + 1; | |
3307 | } | |
3308 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
3309 | strbuf_reset(&sb); | |
3310 | if (ret) | |
3311 | break; | |
9d33f7c2 | 3312 | } |
101d15e0 | 3313 | |
2ff81662 | 3314 | } |
98f85ff4 | 3315 | if (!ret && sb.len) |
9a7a183b | 3316 | ret = show_one_reflog_ent(&sb, fn, cb_data); |
98f85ff4 | 3317 | |
2ff81662 | 3318 | fclose(logfp); |
8ca78803 | 3319 | strbuf_release(&sb); |
2266bf27 | 3320 | return ret; |
2ff81662 | 3321 | } |
e29cb53a | 3322 | |
dfefa935 | 3323 | int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data) |
101d15e0 | 3324 | { |
98f85ff4 JH |
3325 | FILE *logfp; |
3326 | struct strbuf sb = STRBUF_INIT; | |
3327 | int ret = 0; | |
3328 | ||
3329 | logfp = fopen(git_path("logs/%s", refname), "r"); | |
3330 | if (!logfp) | |
3331 | return -1; | |
101d15e0 | 3332 | |
98f85ff4 JH |
3333 | while (!ret && !strbuf_getwholeline(&sb, logfp, '\n')) |
3334 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
3335 | fclose(logfp); | |
3336 | strbuf_release(&sb); | |
3337 | return ret; | |
3338 | } | |
989c0e5d MH |
3339 | /* |
3340 | * Call fn for each reflog in the namespace indicated by name. name | |
3341 | * must be empty or end with '/'. Name will be used as a scratch | |
3342 | * space, but its contents will be restored before return. | |
3343 | */ | |
3344 | static int do_for_each_reflog(struct strbuf *name, each_ref_fn fn, void *cb_data) | |
eb8381c8 | 3345 | { |
989c0e5d | 3346 | DIR *d = opendir(git_path("logs/%s", name->buf)); |
fcee5a14 | 3347 | int retval = 0; |
93c603fc | 3348 | struct dirent *de; |
989c0e5d | 3349 | int oldlen = name->len; |
eb8381c8 | 3350 | |
93c603fc | 3351 | if (!d) |
989c0e5d | 3352 | return name->len ? errno : 0; |
eb8381c8 | 3353 | |
93c603fc MH |
3354 | while ((de = readdir(d)) != NULL) { |
3355 | struct stat st; | |
eb8381c8 | 3356 | |
93c603fc MH |
3357 | if (de->d_name[0] == '.') |
3358 | continue; | |
2975c770 | 3359 | if (ends_with(de->d_name, ".lock")) |
93c603fc | 3360 | continue; |
989c0e5d MH |
3361 | strbuf_addstr(name, de->d_name); |
3362 | if (stat(git_path("logs/%s", name->buf), &st) < 0) { | |
3363 | ; /* silently ignore */ | |
93c603fc | 3364 | } else { |
eb8381c8 | 3365 | if (S_ISDIR(st.st_mode)) { |
989c0e5d MH |
3366 | strbuf_addch(name, '/'); |
3367 | retval = do_for_each_reflog(name, fn, cb_data); | |
eb8381c8 NP |
3368 | } else { |
3369 | unsigned char sha1[20]; | |
989c0e5d MH |
3370 | if (read_ref_full(name->buf, sha1, 0, NULL)) |
3371 | retval = error("bad ref for %s", name->buf); | |
eb8381c8 | 3372 | else |
989c0e5d | 3373 | retval = fn(name->buf, sha1, 0, cb_data); |
eb8381c8 NP |
3374 | } |
3375 | if (retval) | |
3376 | break; | |
3377 | } | |
989c0e5d | 3378 | strbuf_setlen(name, oldlen); |
eb8381c8 | 3379 | } |
93c603fc | 3380 | closedir(d); |
eb8381c8 NP |
3381 | return retval; |
3382 | } | |
3383 | ||
3384 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
3385 | { | |
989c0e5d MH |
3386 | int retval; |
3387 | struct strbuf name; | |
3388 | strbuf_init(&name, PATH_MAX); | |
3389 | retval = do_for_each_reflog(&name, fn, cb_data); | |
3390 | strbuf_release(&name); | |
3391 | return retval; | |
eb8381c8 | 3392 | } |
3d9f037c | 3393 | |
b5c8ea2a MH |
3394 | /** |
3395 | * Information needed for a single ref update. Set new_sha1 to the | |
3396 | * new value or to zero to delete the ref. To check the old value | |
3397 | * while locking the ref, set have_old to 1 and set old_sha1 to the | |
3398 | * value or to zero to ensure the ref does not exist before update. | |
3399 | */ | |
3400 | struct ref_update { | |
b5c8ea2a MH |
3401 | unsigned char new_sha1[20]; |
3402 | unsigned char old_sha1[20]; | |
3403 | int flags; /* REF_NODEREF? */ | |
3404 | int have_old; /* 1 if old_sha1 is valid, 0 otherwise */ | |
81c960e4 | 3405 | struct ref_lock *lock; |
84178db7 | 3406 | int type; |
88615910 | 3407 | const char refname[FLEX_ARRAY]; |
b5c8ea2a MH |
3408 | }; |
3409 | ||
2bdc785f RS |
3410 | /* |
3411 | * Transaction states. | |
3412 | * OPEN: The transaction is in a valid state and can accept new updates. | |
3413 | * An OPEN transaction can be committed. | |
3414 | * CLOSED: A closed transaction is no longer active and no other operations | |
3415 | * than free can be used on it in this state. | |
3416 | * A transaction can either become closed by successfully committing | |
3417 | * an active transaction or if there is a failure while building | |
3418 | * the transaction thus rendering it failed/inactive. | |
3419 | */ | |
3420 | enum ref_transaction_state { | |
3421 | REF_TRANSACTION_OPEN = 0, | |
3422 | REF_TRANSACTION_CLOSED = 1 | |
3423 | }; | |
3424 | ||
caa4046c MH |
3425 | /* |
3426 | * Data structure for holding a reference transaction, which can | |
3427 | * consist of checks and updates to multiple references, carried out | |
3428 | * as atomically as possible. This structure is opaque to callers. | |
3429 | */ | |
3430 | struct ref_transaction { | |
3431 | struct ref_update **updates; | |
3432 | size_t alloc; | |
3433 | size_t nr; | |
2bdc785f | 3434 | enum ref_transaction_state state; |
caa4046c MH |
3435 | }; |
3436 | ||
93a644ea | 3437 | struct ref_transaction *ref_transaction_begin(struct strbuf *err) |
caa4046c MH |
3438 | { |
3439 | return xcalloc(1, sizeof(struct ref_transaction)); | |
3440 | } | |
3441 | ||
026bd1d3 | 3442 | void ref_transaction_free(struct ref_transaction *transaction) |
caa4046c MH |
3443 | { |
3444 | int i; | |
3445 | ||
1b07255c RS |
3446 | if (!transaction) |
3447 | return; | |
3448 | ||
88615910 MH |
3449 | for (i = 0; i < transaction->nr; i++) |
3450 | free(transaction->updates[i]); | |
caa4046c MH |
3451 | |
3452 | free(transaction->updates); | |
3453 | free(transaction); | |
3454 | } | |
3455 | ||
caa4046c MH |
3456 | static struct ref_update *add_update(struct ref_transaction *transaction, |
3457 | const char *refname) | |
3458 | { | |
88615910 MH |
3459 | size_t len = strlen(refname); |
3460 | struct ref_update *update = xcalloc(1, sizeof(*update) + len + 1); | |
caa4046c | 3461 | |
88615910 | 3462 | strcpy((char *)update->refname, refname); |
caa4046c MH |
3463 | ALLOC_GROW(transaction->updates, transaction->nr + 1, transaction->alloc); |
3464 | transaction->updates[transaction->nr++] = update; | |
3465 | return update; | |
3466 | } | |
3467 | ||
8e34800e RS |
3468 | int ref_transaction_update(struct ref_transaction *transaction, |
3469 | const char *refname, | |
3470 | const unsigned char *new_sha1, | |
3471 | const unsigned char *old_sha1, | |
3472 | int flags, int have_old, | |
3473 | struct strbuf *err) | |
caa4046c | 3474 | { |
8e34800e | 3475 | struct ref_update *update; |
caa4046c | 3476 | |
2bdc785f RS |
3477 | if (transaction->state != REF_TRANSACTION_OPEN) |
3478 | die("BUG: update called for transaction that is not open"); | |
3479 | ||
8e34800e RS |
3480 | if (have_old && !old_sha1) |
3481 | die("BUG: have_old is true but old_sha1 is NULL"); | |
caa4046c | 3482 | |
8e34800e | 3483 | update = add_update(transaction, refname); |
caa4046c MH |
3484 | hashcpy(update->new_sha1, new_sha1); |
3485 | update->flags = flags; | |
3486 | update->have_old = have_old; | |
3487 | if (have_old) | |
3488 | hashcpy(update->old_sha1, old_sha1); | |
8e34800e | 3489 | return 0; |
caa4046c MH |
3490 | } |
3491 | ||
b416af5b RS |
3492 | int ref_transaction_create(struct ref_transaction *transaction, |
3493 | const char *refname, | |
3494 | const unsigned char *new_sha1, | |
3495 | int flags, | |
3496 | struct strbuf *err) | |
caa4046c | 3497 | { |
b416af5b RS |
3498 | struct ref_update *update; |
3499 | ||
2bdc785f RS |
3500 | if (transaction->state != REF_TRANSACTION_OPEN) |
3501 | die("BUG: create called for transaction that is not open"); | |
3502 | ||
b416af5b RS |
3503 | if (!new_sha1 || is_null_sha1(new_sha1)) |
3504 | die("BUG: create ref with null new_sha1"); | |
3505 | ||
3506 | update = add_update(transaction, refname); | |
caa4046c | 3507 | |
caa4046c MH |
3508 | hashcpy(update->new_sha1, new_sha1); |
3509 | hashclr(update->old_sha1); | |
3510 | update->flags = flags; | |
3511 | update->have_old = 1; | |
b416af5b | 3512 | return 0; |
caa4046c MH |
3513 | } |
3514 | ||
8c8bdc0d RS |
3515 | int ref_transaction_delete(struct ref_transaction *transaction, |
3516 | const char *refname, | |
3517 | const unsigned char *old_sha1, | |
3518 | int flags, int have_old, | |
3519 | struct strbuf *err) | |
caa4046c | 3520 | { |
8c8bdc0d | 3521 | struct ref_update *update; |
caa4046c | 3522 | |
2bdc785f RS |
3523 | if (transaction->state != REF_TRANSACTION_OPEN) |
3524 | die("BUG: delete called for transaction that is not open"); | |
3525 | ||
8c8bdc0d RS |
3526 | if (have_old && !old_sha1) |
3527 | die("BUG: have_old is true but old_sha1 is NULL"); | |
3528 | ||
3529 | update = add_update(transaction, refname); | |
caa4046c MH |
3530 | update->flags = flags; |
3531 | update->have_old = have_old; | |
3532 | if (have_old) { | |
3533 | assert(!is_null_sha1(old_sha1)); | |
3534 | hashcpy(update->old_sha1, old_sha1); | |
3535 | } | |
8c8bdc0d | 3536 | return 0; |
caa4046c MH |
3537 | } |
3538 | ||
4738a333 BK |
3539 | int update_ref(const char *action, const char *refname, |
3540 | const unsigned char *sha1, const unsigned char *oldval, | |
3541 | int flags, enum action_on_err onerr) | |
3542 | { | |
b4d75ac1 RS |
3543 | struct ref_transaction *t; |
3544 | struct strbuf err = STRBUF_INIT; | |
3545 | ||
3546 | t = ref_transaction_begin(&err); | |
3547 | if (!t || | |
3548 | ref_transaction_update(t, refname, sha1, oldval, flags, | |
3549 | !!oldval, &err) || | |
3550 | ref_transaction_commit(t, action, &err)) { | |
3551 | const char *str = "update_ref failed for ref '%s': %s"; | |
3552 | ||
3553 | ref_transaction_free(t); | |
3554 | switch (onerr) { | |
3555 | case UPDATE_REFS_MSG_ON_ERR: | |
3556 | error(str, refname, err.buf); | |
3557 | break; | |
3558 | case UPDATE_REFS_DIE_ON_ERR: | |
3559 | die(str, refname, err.buf); | |
3560 | break; | |
3561 | case UPDATE_REFS_QUIET_ON_ERR: | |
3562 | break; | |
3563 | } | |
3564 | strbuf_release(&err); | |
4738a333 | 3565 | return 1; |
b4d75ac1 RS |
3566 | } |
3567 | strbuf_release(&err); | |
3568 | ref_transaction_free(t); | |
3569 | return 0; | |
4738a333 BK |
3570 | } |
3571 | ||
98aee92d BK |
3572 | static int ref_update_compare(const void *r1, const void *r2) |
3573 | { | |
3574 | const struct ref_update * const *u1 = r1; | |
3575 | const struct ref_update * const *u2 = r2; | |
5524e241 | 3576 | return strcmp((*u1)->refname, (*u2)->refname); |
98aee92d BK |
3577 | } |
3578 | ||
3579 | static int ref_update_reject_duplicates(struct ref_update **updates, int n, | |
01319837 | 3580 | struct strbuf *err) |
98aee92d BK |
3581 | { |
3582 | int i; | |
3583 | for (i = 1; i < n; i++) | |
5524e241 | 3584 | if (!strcmp(updates[i - 1]->refname, updates[i]->refname)) { |
98aee92d BK |
3585 | const char *str = |
3586 | "Multiple updates for ref '%s' not allowed."; | |
038d0051 RS |
3587 | if (err) |
3588 | strbuf_addf(err, str, updates[i]->refname); | |
3589 | ||
98aee92d BK |
3590 | return 1; |
3591 | } | |
3592 | return 0; | |
3593 | } | |
3594 | ||
b5c8ea2a | 3595 | int ref_transaction_commit(struct ref_transaction *transaction, |
01319837 | 3596 | const char *msg, struct strbuf *err) |
98aee92d BK |
3597 | { |
3598 | int ret = 0, delnum = 0, i; | |
98aee92d | 3599 | const char **delnames; |
b5c8ea2a | 3600 | int n = transaction->nr; |
6a402338 | 3601 | struct ref_update **updates = transaction->updates; |
98aee92d | 3602 | |
2bdc785f RS |
3603 | if (transaction->state != REF_TRANSACTION_OPEN) |
3604 | die("BUG: commit called for transaction that is not open"); | |
3605 | ||
3606 | if (!n) { | |
3607 | transaction->state = REF_TRANSACTION_CLOSED; | |
98aee92d | 3608 | return 0; |
2bdc785f | 3609 | } |
98aee92d BK |
3610 | |
3611 | /* Allocate work space */ | |
98aee92d BK |
3612 | delnames = xmalloc(sizeof(*delnames) * n); |
3613 | ||
3614 | /* Copy, sort, and reject duplicate refs */ | |
98aee92d | 3615 | qsort(updates, n, sizeof(*updates), ref_update_compare); |
01319837 | 3616 | ret = ref_update_reject_duplicates(updates, n, err); |
98aee92d BK |
3617 | if (ret) |
3618 | goto cleanup; | |
3619 | ||
3620 | /* Acquire all locks while verifying old values */ | |
3621 | for (i = 0; i < n; i++) { | |
cb198d21 MH |
3622 | struct ref_update *update = updates[i]; |
3623 | ||
45421e24 RS |
3624 | update->lock = lock_any_ref_for_update(update->refname, |
3625 | (update->have_old ? | |
3626 | update->old_sha1 : | |
3627 | NULL), | |
3628 | update->flags, | |
3629 | &update->type); | |
81c960e4 | 3630 | if (!update->lock) { |
995f8746 RS |
3631 | if (err) |
3632 | strbuf_addf(err, "Cannot lock the ref '%s'.", | |
3633 | update->refname); | |
98aee92d BK |
3634 | ret = 1; |
3635 | goto cleanup; | |
3636 | } | |
3637 | } | |
3638 | ||
3639 | /* Perform updates first so live commits remain referenced */ | |
cb198d21 MH |
3640 | for (i = 0; i < n; i++) { |
3641 | struct ref_update *update = updates[i]; | |
3642 | ||
3643 | if (!is_null_sha1(update->new_sha1)) { | |
04ad6223 RS |
3644 | ret = write_ref_sha1(update->lock, update->new_sha1, |
3645 | msg); | |
3646 | update->lock = NULL; /* freed by write_ref_sha1 */ | |
3647 | if (ret) { | |
3648 | if (err) | |
3649 | strbuf_addf(err, "Cannot update the ref '%s'.", | |
3650 | update->refname); | |
98aee92d | 3651 | goto cleanup; |
04ad6223 | 3652 | } |
98aee92d | 3653 | } |
cb198d21 | 3654 | } |
98aee92d BK |
3655 | |
3656 | /* Perform deletes now that updates are safely completed */ | |
81c960e4 MH |
3657 | for (i = 0; i < n; i++) { |
3658 | struct ref_update *update = updates[i]; | |
3659 | ||
3660 | if (update->lock) { | |
84178db7 | 3661 | ret |= delete_ref_loose(update->lock, update->type); |
029cdb4a RS |
3662 | if (!(update->flags & REF_ISPRUNING)) |
3663 | delnames[delnum++] = update->lock->ref_name; | |
98aee92d | 3664 | } |
81c960e4 MH |
3665 | } |
3666 | ||
60bca085 | 3667 | ret |= repack_without_refs(delnames, delnum, err); |
98aee92d BK |
3668 | for (i = 0; i < delnum; i++) |
3669 | unlink_or_warn(git_path("logs/%s", delnames[i])); | |
3670 | clear_loose_ref_cache(&ref_cache); | |
3671 | ||
3672 | cleanup: | |
2bdc785f RS |
3673 | transaction->state = REF_TRANSACTION_CLOSED; |
3674 | ||
98aee92d | 3675 | for (i = 0; i < n; i++) |
81c960e4 MH |
3676 | if (updates[i]->lock) |
3677 | unlock_ref(updates[i]->lock); | |
98aee92d | 3678 | free(delnames); |
caa4046c MH |
3679 | return ret; |
3680 | } | |
3681 | ||
dfefa935 | 3682 | char *shorten_unambiguous_ref(const char *refname, int strict) |
7c2b3029 JK |
3683 | { |
3684 | int i; | |
3685 | static char **scanf_fmts; | |
3686 | static int nr_rules; | |
3687 | char *short_name; | |
3688 | ||
7c2b3029 | 3689 | if (!nr_rules) { |
4346663a MH |
3690 | /* |
3691 | * Pre-generate scanf formats from ref_rev_parse_rules[]. | |
3692 | * Generate a format suitable for scanf from a | |
3693 | * ref_rev_parse_rules rule by interpolating "%s" at the | |
3694 | * location of the "%.*s". | |
3695 | */ | |
7c2b3029 | 3696 | size_t total_len = 0; |
84d5633f | 3697 | size_t offset = 0; |
7c2b3029 JK |
3698 | |
3699 | /* the rule list is NULL terminated, count them first */ | |
a4165851 | 3700 | for (nr_rules = 0; ref_rev_parse_rules[nr_rules]; nr_rules++) |
7902fe03 MH |
3701 | /* -2 for strlen("%.*s") - strlen("%s"); +1 for NUL */ |
3702 | total_len += strlen(ref_rev_parse_rules[nr_rules]) - 2 + 1; | |
7c2b3029 JK |
3703 | |
3704 | scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len); | |
3705 | ||
84d5633f | 3706 | offset = 0; |
7c2b3029 | 3707 | for (i = 0; i < nr_rules; i++) { |
4346663a | 3708 | assert(offset < total_len); |
84d5633f | 3709 | scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] + offset; |
4346663a MH |
3710 | offset += snprintf(scanf_fmts[i], total_len - offset, |
3711 | ref_rev_parse_rules[i], 2, "%s") + 1; | |
7c2b3029 JK |
3712 | } |
3713 | } | |
3714 | ||
3715 | /* bail out if there are no rules */ | |
3716 | if (!nr_rules) | |
dfefa935 | 3717 | return xstrdup(refname); |
7c2b3029 | 3718 | |
dfefa935 MH |
3719 | /* buffer for scanf result, at most refname must fit */ |
3720 | short_name = xstrdup(refname); | |
7c2b3029 JK |
3721 | |
3722 | /* skip first rule, it will always match */ | |
3723 | for (i = nr_rules - 1; i > 0 ; --i) { | |
3724 | int j; | |
6e7b3309 | 3725 | int rules_to_fail = i; |
7c2b3029 JK |
3726 | int short_name_len; |
3727 | ||
dfefa935 | 3728 | if (1 != sscanf(refname, scanf_fmts[i], short_name)) |
7c2b3029 JK |
3729 | continue; |
3730 | ||
3731 | short_name_len = strlen(short_name); | |
3732 | ||
6e7b3309 BW |
3733 | /* |
3734 | * in strict mode, all (except the matched one) rules | |
3735 | * must fail to resolve to a valid non-ambiguous ref | |
3736 | */ | |
3737 | if (strict) | |
3738 | rules_to_fail = nr_rules; | |
3739 | ||
7c2b3029 JK |
3740 | /* |
3741 | * check if the short name resolves to a valid ref, | |
3742 | * but use only rules prior to the matched one | |
3743 | */ | |
6e7b3309 | 3744 | for (j = 0; j < rules_to_fail; j++) { |
7c2b3029 | 3745 | const char *rule = ref_rev_parse_rules[j]; |
7c2b3029 JK |
3746 | char refname[PATH_MAX]; |
3747 | ||
6e7b3309 BW |
3748 | /* skip matched rule */ |
3749 | if (i == j) | |
3750 | continue; | |
3751 | ||
7c2b3029 JK |
3752 | /* |
3753 | * the short name is ambiguous, if it resolves | |
3754 | * (with this previous rule) to a valid ref | |
3755 | * read_ref() returns 0 on success | |
3756 | */ | |
3757 | mksnpath(refname, sizeof(refname), | |
3758 | rule, short_name_len, short_name); | |
c6893323 | 3759 | if (ref_exists(refname)) |
7c2b3029 JK |
3760 | break; |
3761 | } | |
3762 | ||
3763 | /* | |
3764 | * short name is non-ambiguous if all previous rules | |
3765 | * haven't resolved to a valid ref | |
3766 | */ | |
6e7b3309 | 3767 | if (j == rules_to_fail) |
7c2b3029 JK |
3768 | return short_name; |
3769 | } | |
3770 | ||
3771 | free(short_name); | |
dfefa935 | 3772 | return xstrdup(refname); |
7c2b3029 | 3773 | } |
daebaa78 JH |
3774 | |
3775 | static struct string_list *hide_refs; | |
3776 | ||
3777 | int parse_hide_refs_config(const char *var, const char *value, const char *section) | |
3778 | { | |
3779 | if (!strcmp("transfer.hiderefs", var) || | |
3780 | /* NEEDSWORK: use parse_config_key() once both are merged */ | |
59556548 | 3781 | (starts_with(var, section) && var[strlen(section)] == '.' && |
daebaa78 JH |
3782 | !strcmp(var + strlen(section), ".hiderefs"))) { |
3783 | char *ref; | |
3784 | int len; | |
3785 | ||
3786 | if (!value) | |
3787 | return config_error_nonbool(var); | |
3788 | ref = xstrdup(value); | |
3789 | len = strlen(ref); | |
3790 | while (len && ref[len - 1] == '/') | |
3791 | ref[--len] = '\0'; | |
3792 | if (!hide_refs) { | |
3793 | hide_refs = xcalloc(1, sizeof(*hide_refs)); | |
3794 | hide_refs->strdup_strings = 1; | |
3795 | } | |
3796 | string_list_append(hide_refs, ref); | |
3797 | } | |
3798 | return 0; | |
3799 | } | |
3800 | ||
3801 | int ref_is_hidden(const char *refname) | |
3802 | { | |
3803 | struct string_list_item *item; | |
3804 | ||
3805 | if (!hide_refs) | |
3806 | return 0; | |
3807 | for_each_string_list_item(item, hide_refs) { | |
3808 | int len; | |
59556548 | 3809 | if (!starts_with(refname, item->string)) |
daebaa78 JH |
3810 | continue; |
3811 | len = strlen(item->string); | |
3812 | if (!refname[len] || refname[len] == '/') | |
3813 | return 1; | |
3814 | } | |
3815 | return 0; | |
3816 | } |