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Commit | Line | Data |
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95fc7512 | 1 | #include "cache.h" |
85023577 | 2 | #include "refs.h" |
cf0adba7 JH |
3 | #include "object.h" |
4 | #include "tag.h" | |
7155b727 | 5 | #include "dir.h" |
daebaa78 | 6 | #include "string-list.h" |
95fc7512 | 7 | |
bc5fd6d3 MH |
8 | /* |
9 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
10 | * We do not like it if: | |
11 | * | |
12 | * - any path component of it begins with ".", or | |
13 | * - it has double dots "..", or | |
14 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
15 | * - it ends with a "/". | |
16 | * - it ends with ".lock" | |
17 | * - it contains a "\" (backslash) | |
18 | */ | |
f4204ab9 | 19 | |
bc5fd6d3 MH |
20 | /* Return true iff ch is not allowed in reference names. */ |
21 | static inline int bad_ref_char(int ch) | |
22 | { | |
23 | if (((unsigned) ch) <= ' ' || ch == 0x7f || | |
24 | ch == '~' || ch == '^' || ch == ':' || ch == '\\') | |
25 | return 1; | |
26 | /* 2.13 Pattern Matching Notation */ | |
27 | if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */ | |
28 | return 1; | |
29 | return 0; | |
30 | } | |
31 | ||
32 | /* | |
33 | * Try to read one refname component from the front of refname. Return | |
34 | * the length of the component found, or -1 if the component is not | |
35 | * legal. | |
36 | */ | |
37 | static int check_refname_component(const char *refname, int flags) | |
38 | { | |
39 | const char *cp; | |
40 | char last = '\0'; | |
41 | ||
42 | for (cp = refname; ; cp++) { | |
43 | char ch = *cp; | |
44 | if (ch == '\0' || ch == '/') | |
45 | break; | |
46 | if (bad_ref_char(ch)) | |
47 | return -1; /* Illegal character in refname. */ | |
48 | if (last == '.' && ch == '.') | |
49 | return -1; /* Refname contains "..". */ | |
50 | if (last == '@' && ch == '{') | |
51 | return -1; /* Refname contains "@{". */ | |
52 | last = ch; | |
53 | } | |
54 | if (cp == refname) | |
dac529e4 | 55 | return 0; /* Component has zero length. */ |
bc5fd6d3 MH |
56 | if (refname[0] == '.') { |
57 | if (!(flags & REFNAME_DOT_COMPONENT)) | |
58 | return -1; /* Component starts with '.'. */ | |
59 | /* | |
60 | * Even if leading dots are allowed, don't allow "." | |
61 | * as a component (".." is prevented by a rule above). | |
62 | */ | |
63 | if (refname[1] == '\0') | |
64 | return -1; /* Component equals ".". */ | |
65 | } | |
66 | if (cp - refname >= 5 && !memcmp(cp - 5, ".lock", 5)) | |
67 | return -1; /* Refname ends with ".lock". */ | |
68 | return cp - refname; | |
69 | } | |
70 | ||
71 | int check_refname_format(const char *refname, int flags) | |
72 | { | |
73 | int component_len, component_count = 0; | |
74 | ||
9ba89f48 FC |
75 | if (!strcmp(refname, "@")) |
76 | /* Refname is a single character '@'. */ | |
77 | return -1; | |
78 | ||
bc5fd6d3 MH |
79 | while (1) { |
80 | /* We are at the start of a path component. */ | |
81 | component_len = check_refname_component(refname, flags); | |
dac529e4 | 82 | if (component_len <= 0) { |
bc5fd6d3 MH |
83 | if ((flags & REFNAME_REFSPEC_PATTERN) && |
84 | refname[0] == '*' && | |
85 | (refname[1] == '\0' || refname[1] == '/')) { | |
86 | /* Accept one wildcard as a full refname component. */ | |
87 | flags &= ~REFNAME_REFSPEC_PATTERN; | |
88 | component_len = 1; | |
89 | } else { | |
90 | return -1; | |
91 | } | |
92 | } | |
93 | component_count++; | |
94 | if (refname[component_len] == '\0') | |
95 | break; | |
96 | /* Skip to next component. */ | |
97 | refname += component_len + 1; | |
98 | } | |
99 | ||
100 | if (refname[component_len - 1] == '.') | |
101 | return -1; /* Refname ends with '.'. */ | |
102 | if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2) | |
103 | return -1; /* Refname has only one component. */ | |
104 | return 0; | |
105 | } | |
106 | ||
107 | struct ref_entry; | |
e1e22e37 | 108 | |
28e6a34e MH |
109 | /* |
110 | * Information used (along with the information in ref_entry) to | |
111 | * describe a single cached reference. This data structure only | |
112 | * occurs embedded in a union in struct ref_entry, and only when | |
113 | * (ref_entry->flag & REF_DIR) is zero. | |
114 | */ | |
593f1bb8 | 115 | struct ref_value { |
6c6f58df MH |
116 | /* |
117 | * The name of the object to which this reference resolves | |
118 | * (which may be a tag object). If REF_ISBROKEN, this is | |
119 | * null. If REF_ISSYMREF, then this is the name of the object | |
120 | * referred to by the last reference in the symlink chain. | |
121 | */ | |
593f1bb8 | 122 | unsigned char sha1[20]; |
6c6f58df MH |
123 | |
124 | /* | |
125 | * If REF_KNOWS_PEELED, then this field holds the peeled value | |
126 | * of this reference, or null if the reference is known not to | |
2312a793 MH |
127 | * be peelable. See the documentation for peel_ref() for an |
128 | * exact definition of "peelable". | |
6c6f58df | 129 | */ |
593f1bb8 MH |
130 | unsigned char peeled[20]; |
131 | }; | |
132 | ||
f006c42a MH |
133 | struct ref_cache; |
134 | ||
28e6a34e MH |
135 | /* |
136 | * Information used (along with the information in ref_entry) to | |
137 | * describe a level in the hierarchy of references. This data | |
138 | * structure only occurs embedded in a union in struct ref_entry, and | |
139 | * only when (ref_entry.flag & REF_DIR) is set. In that case, | |
140 | * (ref_entry.flag & REF_INCOMPLETE) determines whether the references | |
141 | * in the directory have already been read: | |
142 | * | |
143 | * (ref_entry.flag & REF_INCOMPLETE) unset -- a directory of loose | |
144 | * or packed references, already read. | |
145 | * | |
146 | * (ref_entry.flag & REF_INCOMPLETE) set -- a directory of loose | |
147 | * references that hasn't been read yet (nor has any of its | |
148 | * subdirectories). | |
149 | * | |
150 | * Entries within a directory are stored within a growable array of | |
151 | * pointers to ref_entries (entries, nr, alloc). Entries 0 <= i < | |
152 | * sorted are sorted by their component name in strcmp() order and the | |
153 | * remaining entries are unsorted. | |
154 | * | |
155 | * Loose references are read lazily, one directory at a time. When a | |
156 | * directory of loose references is read, then all of the references | |
157 | * in that directory are stored, and REF_INCOMPLETE stubs are created | |
158 | * for any subdirectories, but the subdirectories themselves are not | |
159 | * read. The reading is triggered by get_ref_dir(). | |
160 | */ | |
d3177275 | 161 | struct ref_dir { |
e9c4c111 | 162 | int nr, alloc; |
e6ed3ca6 MH |
163 | |
164 | /* | |
165 | * Entries with index 0 <= i < sorted are sorted by name. New | |
166 | * entries are appended to the list unsorted, and are sorted | |
167 | * only when required; thus we avoid the need to sort the list | |
168 | * after the addition of every reference. | |
169 | */ | |
170 | int sorted; | |
171 | ||
f006c42a MH |
172 | /* A pointer to the ref_cache that contains this ref_dir. */ |
173 | struct ref_cache *ref_cache; | |
174 | ||
d3177275 | 175 | struct ref_entry **entries; |
e9c4c111 JP |
176 | }; |
177 | ||
89df9c84 MH |
178 | /* |
179 | * Bit values for ref_entry::flag. REF_ISSYMREF=0x01, | |
180 | * REF_ISPACKED=0x02, and REF_ISBROKEN=0x04 are public values; see | |
181 | * refs.h. | |
182 | */ | |
183 | ||
184 | /* | |
185 | * The field ref_entry->u.value.peeled of this value entry contains | |
186 | * the correct peeled value for the reference, which might be | |
187 | * null_sha1 if the reference is not a tag or if it is broken. | |
188 | */ | |
432ad41e | 189 | #define REF_KNOWS_PEELED 0x08 |
28e6a34e MH |
190 | |
191 | /* ref_entry represents a directory of references */ | |
432ad41e | 192 | #define REF_DIR 0x10 |
cf0adba7 | 193 | |
28e6a34e MH |
194 | /* |
195 | * Entry has not yet been read from disk (used only for REF_DIR | |
196 | * entries representing loose references) | |
197 | */ | |
198 | #define REF_INCOMPLETE 0x20 | |
199 | ||
432ad41e MH |
200 | /* |
201 | * A ref_entry represents either a reference or a "subdirectory" of | |
28e6a34e MH |
202 | * references. |
203 | * | |
204 | * Each directory in the reference namespace is represented by a | |
205 | * ref_entry with (flags & REF_DIR) set and containing a subdir member | |
206 | * that holds the entries in that directory that have been read so | |
207 | * far. If (flags & REF_INCOMPLETE) is set, then the directory and | |
208 | * its subdirectories haven't been read yet. REF_INCOMPLETE is only | |
209 | * used for loose reference directories. | |
210 | * | |
211 | * References are represented by a ref_entry with (flags & REF_DIR) | |
212 | * unset and a value member that describes the reference's value. The | |
213 | * flag member is at the ref_entry level, but it is also needed to | |
214 | * interpret the contents of the value field (in other words, a | |
215 | * ref_value object is not very much use without the enclosing | |
216 | * ref_entry). | |
432ad41e MH |
217 | * |
218 | * Reference names cannot end with slash and directories' names are | |
219 | * always stored with a trailing slash (except for the top-level | |
220 | * directory, which is always denoted by ""). This has two nice | |
221 | * consequences: (1) when the entries in each subdir are sorted | |
222 | * lexicographically by name (as they usually are), the references in | |
223 | * a whole tree can be generated in lexicographic order by traversing | |
224 | * the tree in left-to-right, depth-first order; (2) the names of | |
225 | * references and subdirectories cannot conflict, and therefore the | |
226 | * presence of an empty subdirectory does not block the creation of a | |
227 | * similarly-named reference. (The fact that reference names with the | |
228 | * same leading components can conflict *with each other* is a | |
229 | * separate issue that is regulated by is_refname_available().) | |
230 | * | |
231 | * Please note that the name field contains the fully-qualified | |
232 | * reference (or subdirectory) name. Space could be saved by only | |
233 | * storing the relative names. But that would require the full names | |
234 | * to be generated on the fly when iterating in do_for_each_ref(), and | |
235 | * would break callback functions, who have always been able to assume | |
236 | * that the name strings that they are passed will not be freed during | |
237 | * the iteration. | |
238 | */ | |
bc5fd6d3 MH |
239 | struct ref_entry { |
240 | unsigned char flag; /* ISSYMREF? ISPACKED? */ | |
593f1bb8 | 241 | union { |
432ad41e MH |
242 | struct ref_value value; /* if not (flags&REF_DIR) */ |
243 | struct ref_dir subdir; /* if (flags&REF_DIR) */ | |
593f1bb8 | 244 | } u; |
432ad41e MH |
245 | /* |
246 | * The full name of the reference (e.g., "refs/heads/master") | |
247 | * or the full name of the directory with a trailing slash | |
248 | * (e.g., "refs/heads/"): | |
249 | */ | |
bc5fd6d3 MH |
250 | char name[FLEX_ARRAY]; |
251 | }; | |
e1e22e37 | 252 | |
28e6a34e MH |
253 | static void read_loose_refs(const char *dirname, struct ref_dir *dir); |
254 | ||
d7826d54 MH |
255 | static struct ref_dir *get_ref_dir(struct ref_entry *entry) |
256 | { | |
28e6a34e | 257 | struct ref_dir *dir; |
d7826d54 | 258 | assert(entry->flag & REF_DIR); |
28e6a34e MH |
259 | dir = &entry->u.subdir; |
260 | if (entry->flag & REF_INCOMPLETE) { | |
261 | read_loose_refs(entry->name, dir); | |
262 | entry->flag &= ~REF_INCOMPLETE; | |
263 | } | |
264 | return dir; | |
d7826d54 MH |
265 | } |
266 | ||
cddc4258 MH |
267 | static struct ref_entry *create_ref_entry(const char *refname, |
268 | const unsigned char *sha1, int flag, | |
269 | int check_name) | |
e1e22e37 LT |
270 | { |
271 | int len; | |
cddc4258 | 272 | struct ref_entry *ref; |
e1e22e37 | 273 | |
09116a1c | 274 | if (check_name && |
dfefa935 MH |
275 | check_refname_format(refname, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT)) |
276 | die("Reference has invalid format: '%s'", refname); | |
cddc4258 MH |
277 | len = strlen(refname) + 1; |
278 | ref = xmalloc(sizeof(struct ref_entry) + len); | |
593f1bb8 MH |
279 | hashcpy(ref->u.value.sha1, sha1); |
280 | hashclr(ref->u.value.peeled); | |
cddc4258 MH |
281 | memcpy(ref->name, refname, len); |
282 | ref->flag = flag; | |
283 | return ref; | |
284 | } | |
285 | ||
432ad41e MH |
286 | static void clear_ref_dir(struct ref_dir *dir); |
287 | ||
732134ed MH |
288 | static void free_ref_entry(struct ref_entry *entry) |
289 | { | |
27b5587c MH |
290 | if (entry->flag & REF_DIR) { |
291 | /* | |
292 | * Do not use get_ref_dir() here, as that might | |
293 | * trigger the reading of loose refs. | |
294 | */ | |
295 | clear_ref_dir(&entry->u.subdir); | |
296 | } | |
732134ed MH |
297 | free(entry); |
298 | } | |
299 | ||
432ad41e MH |
300 | /* |
301 | * Add a ref_entry to the end of dir (unsorted). Entry is always | |
302 | * stored directly in dir; no recursion into subdirectories is | |
303 | * done. | |
304 | */ | |
305 | static void add_entry_to_dir(struct ref_dir *dir, struct ref_entry *entry) | |
cddc4258 | 306 | { |
432ad41e MH |
307 | ALLOC_GROW(dir->entries, dir->nr + 1, dir->alloc); |
308 | dir->entries[dir->nr++] = entry; | |
654ad400 MH |
309 | /* optimize for the case that entries are added in order */ |
310 | if (dir->nr == 1 || | |
311 | (dir->nr == dir->sorted + 1 && | |
312 | strcmp(dir->entries[dir->nr - 2]->name, | |
313 | dir->entries[dir->nr - 1]->name) < 0)) | |
314 | dir->sorted = dir->nr; | |
c774aab9 JP |
315 | } |
316 | ||
432ad41e MH |
317 | /* |
318 | * Clear and free all entries in dir, recursively. | |
319 | */ | |
d3177275 | 320 | static void clear_ref_dir(struct ref_dir *dir) |
bc5fd6d3 MH |
321 | { |
322 | int i; | |
d3177275 MH |
323 | for (i = 0; i < dir->nr; i++) |
324 | free_ref_entry(dir->entries[i]); | |
325 | free(dir->entries); | |
326 | dir->sorted = dir->nr = dir->alloc = 0; | |
327 | dir->entries = NULL; | |
bc5fd6d3 MH |
328 | } |
329 | ||
432ad41e MH |
330 | /* |
331 | * Create a struct ref_entry object for the specified dirname. | |
332 | * dirname is the name of the directory with a trailing slash (e.g., | |
333 | * "refs/heads/") or "" for the top-level directory. | |
334 | */ | |
f006c42a | 335 | static struct ref_entry *create_dir_entry(struct ref_cache *ref_cache, |
b9146f51 RS |
336 | const char *dirname, size_t len, |
337 | int incomplete) | |
432ad41e MH |
338 | { |
339 | struct ref_entry *direntry; | |
432ad41e | 340 | direntry = xcalloc(1, sizeof(struct ref_entry) + len + 1); |
b9146f51 RS |
341 | memcpy(direntry->name, dirname, len); |
342 | direntry->name[len] = '\0'; | |
f006c42a | 343 | direntry->u.subdir.ref_cache = ref_cache; |
28e6a34e | 344 | direntry->flag = REF_DIR | (incomplete ? REF_INCOMPLETE : 0); |
432ad41e MH |
345 | return direntry; |
346 | } | |
347 | ||
e9c4c111 | 348 | static int ref_entry_cmp(const void *a, const void *b) |
c774aab9 | 349 | { |
e9c4c111 JP |
350 | struct ref_entry *one = *(struct ref_entry **)a; |
351 | struct ref_entry *two = *(struct ref_entry **)b; | |
352 | return strcmp(one->name, two->name); | |
353 | } | |
c774aab9 | 354 | |
d3177275 | 355 | static void sort_ref_dir(struct ref_dir *dir); |
bc5fd6d3 | 356 | |
e1980c9d JH |
357 | struct string_slice { |
358 | size_t len; | |
359 | const char *str; | |
360 | }; | |
361 | ||
362 | static int ref_entry_cmp_sslice(const void *key_, const void *ent_) | |
363 | { | |
c971ddfd RS |
364 | const struct string_slice *key = key_; |
365 | const struct ref_entry *ent = *(const struct ref_entry * const *)ent_; | |
366 | int cmp = strncmp(key->str, ent->name, key->len); | |
e1980c9d JH |
367 | if (cmp) |
368 | return cmp; | |
c971ddfd | 369 | return '\0' - (unsigned char)ent->name[key->len]; |
e1980c9d JH |
370 | } |
371 | ||
432ad41e | 372 | /* |
9fc0a648 MH |
373 | * Return the index of the entry with the given refname from the |
374 | * ref_dir (non-recursively), sorting dir if necessary. Return -1 if | |
375 | * no such entry is found. dir must already be complete. | |
432ad41e | 376 | */ |
9fc0a648 | 377 | static int search_ref_dir(struct ref_dir *dir, const char *refname, size_t len) |
bc5fd6d3 | 378 | { |
e1980c9d JH |
379 | struct ref_entry **r; |
380 | struct string_slice key; | |
bc5fd6d3 | 381 | |
432ad41e | 382 | if (refname == NULL || !dir->nr) |
9fc0a648 | 383 | return -1; |
bc5fd6d3 | 384 | |
d3177275 | 385 | sort_ref_dir(dir); |
e1980c9d JH |
386 | key.len = len; |
387 | key.str = refname; | |
388 | r = bsearch(&key, dir->entries, dir->nr, sizeof(*dir->entries), | |
389 | ref_entry_cmp_sslice); | |
bc5fd6d3 MH |
390 | |
391 | if (r == NULL) | |
9fc0a648 | 392 | return -1; |
bc5fd6d3 | 393 | |
9fc0a648 | 394 | return r - dir->entries; |
bc5fd6d3 MH |
395 | } |
396 | ||
f348ac92 MH |
397 | /* |
398 | * Search for a directory entry directly within dir (without | |
399 | * recursing). Sort dir if necessary. subdirname must be a directory | |
400 | * name (i.e., end in '/'). If mkdir is set, then create the | |
401 | * directory if it is missing; otherwise, return NULL if the desired | |
28e6a34e | 402 | * directory cannot be found. dir must already be complete. |
f348ac92 | 403 | */ |
3f3aa1bc | 404 | static struct ref_dir *search_for_subdir(struct ref_dir *dir, |
dd02e728 RS |
405 | const char *subdirname, size_t len, |
406 | int mkdir) | |
f348ac92 | 407 | { |
9fc0a648 MH |
408 | int entry_index = search_ref_dir(dir, subdirname, len); |
409 | struct ref_entry *entry; | |
410 | if (entry_index == -1) { | |
f348ac92 MH |
411 | if (!mkdir) |
412 | return NULL; | |
28e6a34e MH |
413 | /* |
414 | * Since dir is complete, the absence of a subdir | |
415 | * means that the subdir really doesn't exist; | |
416 | * therefore, create an empty record for it but mark | |
417 | * the record complete. | |
418 | */ | |
b9146f51 | 419 | entry = create_dir_entry(dir->ref_cache, subdirname, len, 0); |
f348ac92 | 420 | add_entry_to_dir(dir, entry); |
9fc0a648 MH |
421 | } else { |
422 | entry = dir->entries[entry_index]; | |
f348ac92 | 423 | } |
3f3aa1bc | 424 | return get_ref_dir(entry); |
f348ac92 MH |
425 | } |
426 | ||
432ad41e MH |
427 | /* |
428 | * If refname is a reference name, find the ref_dir within the dir | |
429 | * tree that should hold refname. If refname is a directory name | |
430 | * (i.e., ends in '/'), then return that ref_dir itself. dir must | |
28e6a34e MH |
431 | * represent the top-level directory and must already be complete. |
432 | * Sort ref_dirs and recurse into subdirectories as necessary. If | |
433 | * mkdir is set, then create any missing directories; otherwise, | |
434 | * return NULL if the desired directory cannot be found. | |
432ad41e MH |
435 | */ |
436 | static struct ref_dir *find_containing_dir(struct ref_dir *dir, | |
437 | const char *refname, int mkdir) | |
438 | { | |
5fa04418 | 439 | const char *slash; |
5fa04418 | 440 | for (slash = strchr(refname, '/'); slash; slash = strchr(slash + 1, '/')) { |
dd02e728 | 441 | size_t dirnamelen = slash - refname + 1; |
3f3aa1bc | 442 | struct ref_dir *subdir; |
dd02e728 | 443 | subdir = search_for_subdir(dir, refname, dirnamelen, mkdir); |
663c1295 JH |
444 | if (!subdir) { |
445 | dir = NULL; | |
f348ac92 | 446 | break; |
432ad41e | 447 | } |
3f3aa1bc | 448 | dir = subdir; |
432ad41e MH |
449 | } |
450 | ||
432ad41e MH |
451 | return dir; |
452 | } | |
453 | ||
454 | /* | |
455 | * Find the value entry with the given name in dir, sorting ref_dirs | |
456 | * and recursing into subdirectories as necessary. If the name is not | |
457 | * found or it corresponds to a directory entry, return NULL. | |
458 | */ | |
459 | static struct ref_entry *find_ref(struct ref_dir *dir, const char *refname) | |
460 | { | |
9fc0a648 | 461 | int entry_index; |
432ad41e MH |
462 | struct ref_entry *entry; |
463 | dir = find_containing_dir(dir, refname, 0); | |
464 | if (!dir) | |
465 | return NULL; | |
9fc0a648 MH |
466 | entry_index = search_ref_dir(dir, refname, strlen(refname)); |
467 | if (entry_index == -1) | |
468 | return NULL; | |
469 | entry = dir->entries[entry_index]; | |
470 | return (entry->flag & REF_DIR) ? NULL : entry; | |
432ad41e MH |
471 | } |
472 | ||
506a760d MH |
473 | /* |
474 | * Remove the entry with the given name from dir, recursing into | |
475 | * subdirectories as necessary. If refname is the name of a directory | |
476 | * (i.e., ends with '/'), then remove the directory and its contents. | |
477 | * If the removal was successful, return the number of entries | |
478 | * remaining in the directory entry that contained the deleted entry. | |
479 | * If the name was not found, return -1. Please note that this | |
480 | * function only deletes the entry from the cache; it does not delete | |
481 | * it from the filesystem or ensure that other cache entries (which | |
482 | * might be symbolic references to the removed entry) are updated. | |
483 | * Nor does it remove any containing dir entries that might be made | |
484 | * empty by the removal. dir must represent the top-level directory | |
485 | * and must already be complete. | |
486 | */ | |
487 | static int remove_entry(struct ref_dir *dir, const char *refname) | |
488 | { | |
489 | int refname_len = strlen(refname); | |
490 | int entry_index; | |
491 | struct ref_entry *entry; | |
492 | int is_dir = refname[refname_len - 1] == '/'; | |
493 | if (is_dir) { | |
494 | /* | |
495 | * refname represents a reference directory. Remove | |
496 | * the trailing slash; otherwise we will get the | |
497 | * directory *representing* refname rather than the | |
498 | * one *containing* it. | |
499 | */ | |
500 | char *dirname = xmemdupz(refname, refname_len - 1); | |
501 | dir = find_containing_dir(dir, dirname, 0); | |
502 | free(dirname); | |
503 | } else { | |
504 | dir = find_containing_dir(dir, refname, 0); | |
505 | } | |
506 | if (!dir) | |
507 | return -1; | |
508 | entry_index = search_ref_dir(dir, refname, refname_len); | |
509 | if (entry_index == -1) | |
510 | return -1; | |
511 | entry = dir->entries[entry_index]; | |
512 | ||
513 | memmove(&dir->entries[entry_index], | |
514 | &dir->entries[entry_index + 1], | |
515 | (dir->nr - entry_index - 1) * sizeof(*dir->entries) | |
516 | ); | |
517 | dir->nr--; | |
518 | if (dir->sorted > entry_index) | |
519 | dir->sorted--; | |
520 | free_ref_entry(entry); | |
521 | return dir->nr; | |
432ad41e MH |
522 | } |
523 | ||
524 | /* | |
525 | * Add a ref_entry to the ref_dir (unsorted), recursing into | |
526 | * subdirectories as necessary. dir must represent the top-level | |
527 | * directory. Return 0 on success. | |
528 | */ | |
529 | static int add_ref(struct ref_dir *dir, struct ref_entry *ref) | |
530 | { | |
531 | dir = find_containing_dir(dir, ref->name, 1); | |
532 | if (!dir) | |
533 | return -1; | |
534 | add_entry_to_dir(dir, ref); | |
535 | return 0; | |
536 | } | |
537 | ||
202a56a9 MH |
538 | /* |
539 | * Emit a warning and return true iff ref1 and ref2 have the same name | |
540 | * and the same sha1. Die if they have the same name but different | |
541 | * sha1s. | |
542 | */ | |
543 | static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2) | |
544 | { | |
432ad41e | 545 | if (strcmp(ref1->name, ref2->name)) |
202a56a9 | 546 | return 0; |
432ad41e MH |
547 | |
548 | /* Duplicate name; make sure that they don't conflict: */ | |
549 | ||
550 | if ((ref1->flag & REF_DIR) || (ref2->flag & REF_DIR)) | |
551 | /* This is impossible by construction */ | |
552 | die("Reference directory conflict: %s", ref1->name); | |
553 | ||
554 | if (hashcmp(ref1->u.value.sha1, ref2->u.value.sha1)) | |
555 | die("Duplicated ref, and SHA1s don't match: %s", ref1->name); | |
556 | ||
557 | warning("Duplicated ref: %s", ref1->name); | |
558 | return 1; | |
202a56a9 MH |
559 | } |
560 | ||
e6ed3ca6 | 561 | /* |
432ad41e MH |
562 | * Sort the entries in dir non-recursively (if they are not already |
563 | * sorted) and remove any duplicate entries. | |
e6ed3ca6 | 564 | */ |
d3177275 | 565 | static void sort_ref_dir(struct ref_dir *dir) |
e9c4c111 | 566 | { |
202a56a9 | 567 | int i, j; |
81a79d8e | 568 | struct ref_entry *last = NULL; |
c774aab9 | 569 | |
e6ed3ca6 MH |
570 | /* |
571 | * This check also prevents passing a zero-length array to qsort(), | |
572 | * which is a problem on some platforms. | |
573 | */ | |
d3177275 | 574 | if (dir->sorted == dir->nr) |
e9c4c111 | 575 | return; |
c774aab9 | 576 | |
d3177275 | 577 | qsort(dir->entries, dir->nr, sizeof(*dir->entries), ref_entry_cmp); |
c774aab9 | 578 | |
81a79d8e MH |
579 | /* Remove any duplicates: */ |
580 | for (i = 0, j = 0; j < dir->nr; j++) { | |
581 | struct ref_entry *entry = dir->entries[j]; | |
582 | if (last && is_dup_ref(last, entry)) | |
583 | free_ref_entry(entry); | |
584 | else | |
585 | last = dir->entries[i++] = entry; | |
e9c4c111 | 586 | } |
81a79d8e | 587 | dir->sorted = dir->nr = i; |
e9c4c111 | 588 | } |
c774aab9 | 589 | |
fcce1703 MH |
590 | /* Include broken references in a do_for_each_ref*() iteration: */ |
591 | #define DO_FOR_EACH_INCLUDE_BROKEN 0x01 | |
c774aab9 | 592 | |
662428f4 MH |
593 | /* |
594 | * Return true iff the reference described by entry can be resolved to | |
595 | * an object in the database. Emit a warning if the referred-to | |
596 | * object does not exist. | |
597 | */ | |
598 | static int ref_resolves_to_object(struct ref_entry *entry) | |
599 | { | |
600 | if (entry->flag & REF_ISBROKEN) | |
601 | return 0; | |
602 | if (!has_sha1_file(entry->u.value.sha1)) { | |
603 | error("%s does not point to a valid object!", entry->name); | |
604 | return 0; | |
605 | } | |
606 | return 1; | |
607 | } | |
c774aab9 | 608 | |
7d76fdc8 MH |
609 | /* |
610 | * current_ref is a performance hack: when iterating over references | |
611 | * using the for_each_ref*() functions, current_ref is set to the | |
612 | * current reference's entry before calling the callback function. If | |
613 | * the callback function calls peel_ref(), then peel_ref() first | |
614 | * checks whether the reference to be peeled is the current reference | |
615 | * (it usually is) and if so, returns that reference's peeled version | |
616 | * if it is available. This avoids a refname lookup in a common case. | |
617 | */ | |
bc5fd6d3 | 618 | static struct ref_entry *current_ref; |
c774aab9 | 619 | |
624cac35 MH |
620 | typedef int each_ref_entry_fn(struct ref_entry *entry, void *cb_data); |
621 | ||
622 | struct ref_entry_cb { | |
623 | const char *base; | |
624 | int trim; | |
625 | int flags; | |
626 | each_ref_fn *fn; | |
627 | void *cb_data; | |
628 | }; | |
629 | ||
fcce1703 | 630 | /* |
624cac35 MH |
631 | * Handle one reference in a do_for_each_ref*()-style iteration, |
632 | * calling an each_ref_fn for each entry. | |
fcce1703 | 633 | */ |
624cac35 | 634 | static int do_one_ref(struct ref_entry *entry, void *cb_data) |
bc5fd6d3 | 635 | { |
624cac35 | 636 | struct ref_entry_cb *data = cb_data; |
d0cf51e9 | 637 | struct ref_entry *old_current_ref; |
429213e4 | 638 | int retval; |
d0cf51e9 | 639 | |
59556548 | 640 | if (!starts_with(entry->name, data->base)) |
bc5fd6d3 | 641 | return 0; |
c774aab9 | 642 | |
624cac35 | 643 | if (!(data->flags & DO_FOR_EACH_INCLUDE_BROKEN) && |
662428f4 | 644 | !ref_resolves_to_object(entry)) |
bc5fd6d3 | 645 | return 0; |
c774aab9 | 646 | |
d0cf51e9 MH |
647 | /* Store the old value, in case this is a recursive call: */ |
648 | old_current_ref = current_ref; | |
bc5fd6d3 | 649 | current_ref = entry; |
624cac35 MH |
650 | retval = data->fn(entry->name + data->trim, entry->u.value.sha1, |
651 | entry->flag, data->cb_data); | |
d0cf51e9 | 652 | current_ref = old_current_ref; |
429213e4 | 653 | return retval; |
bc5fd6d3 | 654 | } |
c774aab9 | 655 | |
c36b5bc2 | 656 | /* |
d3177275 | 657 | * Call fn for each reference in dir that has index in the range |
432ad41e MH |
658 | * offset <= index < dir->nr. Recurse into subdirectories that are in |
659 | * that index range, sorting them before iterating. This function | |
624cac35 MH |
660 | * does not sort dir itself; it should be sorted beforehand. fn is |
661 | * called for all references, including broken ones. | |
c36b5bc2 | 662 | */ |
624cac35 MH |
663 | static int do_for_each_entry_in_dir(struct ref_dir *dir, int offset, |
664 | each_ref_entry_fn fn, void *cb_data) | |
c36b5bc2 MH |
665 | { |
666 | int i; | |
d3177275 MH |
667 | assert(dir->sorted == dir->nr); |
668 | for (i = offset; i < dir->nr; i++) { | |
432ad41e MH |
669 | struct ref_entry *entry = dir->entries[i]; |
670 | int retval; | |
671 | if (entry->flag & REF_DIR) { | |
d7826d54 MH |
672 | struct ref_dir *subdir = get_ref_dir(entry); |
673 | sort_ref_dir(subdir); | |
624cac35 | 674 | retval = do_for_each_entry_in_dir(subdir, 0, fn, cb_data); |
432ad41e | 675 | } else { |
624cac35 | 676 | retval = fn(entry, cb_data); |
432ad41e | 677 | } |
c36b5bc2 MH |
678 | if (retval) |
679 | return retval; | |
680 | } | |
681 | return 0; | |
682 | } | |
683 | ||
b3fd060f | 684 | /* |
d3177275 | 685 | * Call fn for each reference in the union of dir1 and dir2, in order |
432ad41e MH |
686 | * by refname. Recurse into subdirectories. If a value entry appears |
687 | * in both dir1 and dir2, then only process the version that is in | |
688 | * dir2. The input dirs must already be sorted, but subdirs will be | |
624cac35 MH |
689 | * sorted as needed. fn is called for all references, including |
690 | * broken ones. | |
b3fd060f | 691 | */ |
624cac35 MH |
692 | static int do_for_each_entry_in_dirs(struct ref_dir *dir1, |
693 | struct ref_dir *dir2, | |
694 | each_ref_entry_fn fn, void *cb_data) | |
b3fd060f MH |
695 | { |
696 | int retval; | |
697 | int i1 = 0, i2 = 0; | |
698 | ||
d3177275 MH |
699 | assert(dir1->sorted == dir1->nr); |
700 | assert(dir2->sorted == dir2->nr); | |
432ad41e MH |
701 | while (1) { |
702 | struct ref_entry *e1, *e2; | |
703 | int cmp; | |
704 | if (i1 == dir1->nr) { | |
624cac35 | 705 | return do_for_each_entry_in_dir(dir2, i2, fn, cb_data); |
432ad41e MH |
706 | } |
707 | if (i2 == dir2->nr) { | |
624cac35 | 708 | return do_for_each_entry_in_dir(dir1, i1, fn, cb_data); |
432ad41e MH |
709 | } |
710 | e1 = dir1->entries[i1]; | |
711 | e2 = dir2->entries[i2]; | |
712 | cmp = strcmp(e1->name, e2->name); | |
713 | if (cmp == 0) { | |
714 | if ((e1->flag & REF_DIR) && (e2->flag & REF_DIR)) { | |
715 | /* Both are directories; descend them in parallel. */ | |
d7826d54 MH |
716 | struct ref_dir *subdir1 = get_ref_dir(e1); |
717 | struct ref_dir *subdir2 = get_ref_dir(e2); | |
718 | sort_ref_dir(subdir1); | |
719 | sort_ref_dir(subdir2); | |
624cac35 MH |
720 | retval = do_for_each_entry_in_dirs( |
721 | subdir1, subdir2, fn, cb_data); | |
432ad41e MH |
722 | i1++; |
723 | i2++; | |
724 | } else if (!(e1->flag & REF_DIR) && !(e2->flag & REF_DIR)) { | |
725 | /* Both are references; ignore the one from dir1. */ | |
624cac35 | 726 | retval = fn(e2, cb_data); |
432ad41e MH |
727 | i1++; |
728 | i2++; | |
729 | } else { | |
730 | die("conflict between reference and directory: %s", | |
731 | e1->name); | |
732 | } | |
b3fd060f | 733 | } else { |
432ad41e MH |
734 | struct ref_entry *e; |
735 | if (cmp < 0) { | |
736 | e = e1; | |
b3fd060f | 737 | i1++; |
432ad41e MH |
738 | } else { |
739 | e = e2; | |
740 | i2++; | |
741 | } | |
742 | if (e->flag & REF_DIR) { | |
d7826d54 MH |
743 | struct ref_dir *subdir = get_ref_dir(e); |
744 | sort_ref_dir(subdir); | |
624cac35 MH |
745 | retval = do_for_each_entry_in_dir( |
746 | subdir, 0, fn, cb_data); | |
432ad41e | 747 | } else { |
624cac35 | 748 | retval = fn(e, cb_data); |
b3fd060f MH |
749 | } |
750 | } | |
751 | if (retval) | |
752 | return retval; | |
753 | } | |
b3fd060f MH |
754 | } |
755 | ||
98eeb09e JK |
756 | /* |
757 | * Load all of the refs from the dir into our in-memory cache. The hard work | |
758 | * of loading loose refs is done by get_ref_dir(), so we just need to recurse | |
759 | * through all of the sub-directories. We do not even need to care about | |
760 | * sorting, as traversal order does not matter to us. | |
761 | */ | |
762 | static void prime_ref_dir(struct ref_dir *dir) | |
763 | { | |
764 | int i; | |
765 | for (i = 0; i < dir->nr; i++) { | |
766 | struct ref_entry *entry = dir->entries[i]; | |
767 | if (entry->flag & REF_DIR) | |
768 | prime_ref_dir(get_ref_dir(entry)); | |
769 | } | |
770 | } | |
d66da478 MH |
771 | /* |
772 | * Return true iff refname1 and refname2 conflict with each other. | |
773 | * Two reference names conflict if one of them exactly matches the | |
774 | * leading components of the other; e.g., "foo/bar" conflicts with | |
775 | * both "foo" and with "foo/bar/baz" but not with "foo/bar" or | |
776 | * "foo/barbados". | |
777 | */ | |
778 | static int names_conflict(const char *refname1, const char *refname2) | |
779 | { | |
5a4d4947 MH |
780 | for (; *refname1 && *refname1 == *refname2; refname1++, refname2++) |
781 | ; | |
782 | return (*refname1 == '\0' && *refname2 == '/') | |
783 | || (*refname1 == '/' && *refname2 == '\0'); | |
784 | } | |
785 | ||
786 | struct name_conflict_cb { | |
787 | const char *refname; | |
788 | const char *oldrefname; | |
789 | const char *conflicting_refname; | |
790 | }; | |
791 | ||
624cac35 | 792 | static int name_conflict_fn(struct ref_entry *entry, void *cb_data) |
5a4d4947 MH |
793 | { |
794 | struct name_conflict_cb *data = (struct name_conflict_cb *)cb_data; | |
624cac35 | 795 | if (data->oldrefname && !strcmp(data->oldrefname, entry->name)) |
5a4d4947 | 796 | return 0; |
624cac35 MH |
797 | if (names_conflict(data->refname, entry->name)) { |
798 | data->conflicting_refname = entry->name; | |
5a4d4947 | 799 | return 1; |
d66da478 | 800 | } |
5a4d4947 | 801 | return 0; |
d66da478 MH |
802 | } |
803 | ||
bc5fd6d3 MH |
804 | /* |
805 | * Return true iff a reference named refname could be created without | |
624cac35 | 806 | * conflicting with the name of an existing reference in dir. If |
5a4d4947 MH |
807 | * oldrefname is non-NULL, ignore potential conflicts with oldrefname |
808 | * (e.g., because oldrefname is scheduled for deletion in the same | |
bc5fd6d3 MH |
809 | * operation). |
810 | */ | |
811 | static int is_refname_available(const char *refname, const char *oldrefname, | |
d3177275 | 812 | struct ref_dir *dir) |
bc5fd6d3 | 813 | { |
5a4d4947 MH |
814 | struct name_conflict_cb data; |
815 | data.refname = refname; | |
816 | data.oldrefname = oldrefname; | |
817 | data.conflicting_refname = NULL; | |
818 | ||
d3177275 | 819 | sort_ref_dir(dir); |
624cac35 | 820 | if (do_for_each_entry_in_dir(dir, 0, name_conflict_fn, &data)) { |
5a4d4947 MH |
821 | error("'%s' exists; cannot create '%s'", |
822 | data.conflicting_refname, refname); | |
823 | return 0; | |
bc5fd6d3 MH |
824 | } |
825 | return 1; | |
e1e22e37 LT |
826 | } |
827 | ||
2fff7812 MH |
828 | struct packed_ref_cache { |
829 | struct ref_entry *root; | |
9f69d297 | 830 | |
5f5e2a88 MH |
831 | /* |
832 | * Count of references to the data structure in this instance, | |
833 | * including the pointer from ref_cache::packed if any. The | |
834 | * data will not be freed as long as the reference count is | |
835 | * nonzero. | |
836 | */ | |
837 | unsigned int referrers; | |
838 | ||
9f69d297 MH |
839 | /* |
840 | * Iff the packed-refs file associated with this instance is | |
841 | * currently locked for writing, this points at the associated | |
4f6b83e3 MH |
842 | * lock (which is owned by somebody else). The referrer count |
843 | * is also incremented when the file is locked and decremented | |
844 | * when it is unlocked. | |
9f69d297 MH |
845 | */ |
846 | struct lock_file *lock; | |
ca919930 JK |
847 | |
848 | /* The metadata from when this packed-refs cache was read */ | |
849 | struct stat_validity validity; | |
2fff7812 MH |
850 | }; |
851 | ||
5e290ff7 JH |
852 | /* |
853 | * Future: need to be in "struct repository" | |
854 | * when doing a full libification. | |
855 | */ | |
79c7ca54 MH |
856 | static struct ref_cache { |
857 | struct ref_cache *next; | |
d12229f5 | 858 | struct ref_entry *loose; |
2fff7812 | 859 | struct packed_ref_cache *packed; |
9da31cb0 MH |
860 | /* |
861 | * The submodule name, or "" for the main repo. We allocate | |
862 | * length 1 rather than FLEX_ARRAY so that the main ref_cache | |
863 | * is initialized correctly. | |
864 | */ | |
865 | char name[1]; | |
866 | } ref_cache, *submodule_ref_caches; | |
0e88c130 | 867 | |
9f69d297 MH |
868 | /* Lock used for the main packed-refs file: */ |
869 | static struct lock_file packlock; | |
870 | ||
5f5e2a88 MH |
871 | /* |
872 | * Increment the reference count of *packed_refs. | |
873 | */ | |
874 | static void acquire_packed_ref_cache(struct packed_ref_cache *packed_refs) | |
875 | { | |
876 | packed_refs->referrers++; | |
877 | } | |
878 | ||
879 | /* | |
880 | * Decrease the reference count of *packed_refs. If it goes to zero, | |
881 | * free *packed_refs and return true; otherwise return false. | |
882 | */ | |
883 | static int release_packed_ref_cache(struct packed_ref_cache *packed_refs) | |
884 | { | |
885 | if (!--packed_refs->referrers) { | |
886 | free_ref_entry(packed_refs->root); | |
ca919930 | 887 | stat_validity_clear(&packed_refs->validity); |
5f5e2a88 MH |
888 | free(packed_refs); |
889 | return 1; | |
890 | } else { | |
891 | return 0; | |
892 | } | |
893 | } | |
894 | ||
760c4512 | 895 | static void clear_packed_ref_cache(struct ref_cache *refs) |
e1e22e37 | 896 | { |
d12229f5 | 897 | if (refs->packed) { |
5f5e2a88 MH |
898 | struct packed_ref_cache *packed_refs = refs->packed; |
899 | ||
900 | if (packed_refs->lock) | |
9f69d297 | 901 | die("internal error: packed-ref cache cleared while locked"); |
d12229f5 | 902 | refs->packed = NULL; |
5f5e2a88 | 903 | release_packed_ref_cache(packed_refs); |
d12229f5 | 904 | } |
5e290ff7 | 905 | } |
e1e22e37 | 906 | |
760c4512 MH |
907 | static void clear_loose_ref_cache(struct ref_cache *refs) |
908 | { | |
d12229f5 MH |
909 | if (refs->loose) { |
910 | free_ref_entry(refs->loose); | |
911 | refs->loose = NULL; | |
912 | } | |
760c4512 MH |
913 | } |
914 | ||
79c7ca54 | 915 | static struct ref_cache *create_ref_cache(const char *submodule) |
e5dbf605 | 916 | { |
ce40979c | 917 | int len; |
79c7ca54 | 918 | struct ref_cache *refs; |
ce40979c MH |
919 | if (!submodule) |
920 | submodule = ""; | |
921 | len = strlen(submodule) + 1; | |
79c7ca54 | 922 | refs = xcalloc(1, sizeof(struct ref_cache) + len); |
ce40979c | 923 | memcpy(refs->name, submodule, len); |
e5dbf605 MH |
924 | return refs; |
925 | } | |
926 | ||
4349a668 | 927 | /* |
79c7ca54 | 928 | * Return a pointer to a ref_cache for the specified submodule. For |
4349a668 MH |
929 | * the main repository, use submodule==NULL. The returned structure |
930 | * will be allocated and initialized but not necessarily populated; it | |
931 | * should not be freed. | |
932 | */ | |
79c7ca54 | 933 | static struct ref_cache *get_ref_cache(const char *submodule) |
4349a668 | 934 | { |
9da31cb0 MH |
935 | struct ref_cache *refs; |
936 | ||
937 | if (!submodule || !*submodule) | |
938 | return &ref_cache; | |
939 | ||
940 | for (refs = submodule_ref_caches; refs; refs = refs->next) | |
0e88c130 MH |
941 | if (!strcmp(submodule, refs->name)) |
942 | return refs; | |
0e88c130 | 943 | |
79c7ca54 | 944 | refs = create_ref_cache(submodule); |
9da31cb0 MH |
945 | refs->next = submodule_ref_caches; |
946 | submodule_ref_caches = refs; | |
0e88c130 | 947 | return refs; |
4349a668 MH |
948 | } |
949 | ||
3feb4f0c MH |
950 | /* The length of a peeled reference line in packed-refs, including EOL: */ |
951 | #define PEELED_LINE_LENGTH 42 | |
952 | ||
694b7a19 MH |
953 | /* |
954 | * The packed-refs header line that we write out. Perhaps other | |
955 | * traits will be added later. The trailing space is required. | |
956 | */ | |
957 | static const char PACKED_REFS_HEADER[] = | |
958 | "# pack-refs with: peeled fully-peeled \n"; | |
959 | ||
bc5fd6d3 MH |
960 | /* |
961 | * Parse one line from a packed-refs file. Write the SHA1 to sha1. | |
962 | * Return a pointer to the refname within the line (null-terminated), | |
963 | * or NULL if there was a problem. | |
964 | */ | |
965 | static const char *parse_ref_line(char *line, unsigned char *sha1) | |
966 | { | |
967 | /* | |
968 | * 42: the answer to everything. | |
969 | * | |
970 | * In this case, it happens to be the answer to | |
971 | * 40 (length of sha1 hex representation) | |
972 | * +1 (space in between hex and name) | |
973 | * +1 (newline at the end of the line) | |
974 | */ | |
975 | int len = strlen(line) - 42; | |
976 | ||
977 | if (len <= 0) | |
978 | return NULL; | |
979 | if (get_sha1_hex(line, sha1) < 0) | |
980 | return NULL; | |
981 | if (!isspace(line[40])) | |
982 | return NULL; | |
983 | line += 41; | |
984 | if (isspace(*line)) | |
985 | return NULL; | |
986 | if (line[len] != '\n') | |
987 | return NULL; | |
988 | line[len] = 0; | |
989 | ||
990 | return line; | |
991 | } | |
992 | ||
c29c46fa MH |
993 | /* |
994 | * Read f, which is a packed-refs file, into dir. | |
995 | * | |
996 | * A comment line of the form "# pack-refs with: " may contain zero or | |
997 | * more traits. We interpret the traits as follows: | |
998 | * | |
999 | * No traits: | |
1000 | * | |
1001 | * Probably no references are peeled. But if the file contains a | |
1002 | * peeled value for a reference, we will use it. | |
1003 | * | |
1004 | * peeled: | |
1005 | * | |
1006 | * References under "refs/tags/", if they *can* be peeled, *are* | |
1007 | * peeled in this file. References outside of "refs/tags/" are | |
1008 | * probably not peeled even if they could have been, but if we find | |
1009 | * a peeled value for such a reference we will use it. | |
1010 | * | |
1011 | * fully-peeled: | |
1012 | * | |
1013 | * All references in the file that can be peeled are peeled. | |
1014 | * Inversely (and this is more important), any references in the | |
1015 | * file for which no peeled value is recorded is not peelable. This | |
1016 | * trait should typically be written alongside "peeled" for | |
1017 | * compatibility with older clients, but we do not require it | |
1018 | * (i.e., "peeled" is a no-op if "fully-peeled" is set). | |
1019 | */ | |
d3177275 | 1020 | static void read_packed_refs(FILE *f, struct ref_dir *dir) |
f4204ab9 | 1021 | { |
e9c4c111 | 1022 | struct ref_entry *last = NULL; |
f4204ab9 | 1023 | char refline[PATH_MAX]; |
c29c46fa | 1024 | enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE; |
f4204ab9 JH |
1025 | |
1026 | while (fgets(refline, sizeof(refline), f)) { | |
1027 | unsigned char sha1[20]; | |
dfefa935 | 1028 | const char *refname; |
f4204ab9 JH |
1029 | static const char header[] = "# pack-refs with:"; |
1030 | ||
1031 | if (!strncmp(refline, header, sizeof(header)-1)) { | |
1032 | const char *traits = refline + sizeof(header) - 1; | |
c29c46fa MH |
1033 | if (strstr(traits, " fully-peeled ")) |
1034 | peeled = PEELED_FULLY; | |
1035 | else if (strstr(traits, " peeled ")) | |
1036 | peeled = PEELED_TAGS; | |
f4204ab9 JH |
1037 | /* perhaps other traits later as well */ |
1038 | continue; | |
1039 | } | |
1040 | ||
dfefa935 MH |
1041 | refname = parse_ref_line(refline, sha1); |
1042 | if (refname) { | |
c29c46fa MH |
1043 | last = create_ref_entry(refname, sha1, REF_ISPACKED, 1); |
1044 | if (peeled == PEELED_FULLY || | |
59556548 | 1045 | (peeled == PEELED_TAGS && starts_with(refname, "refs/tags/"))) |
c29c46fa | 1046 | last->flag |= REF_KNOWS_PEELED; |
d3177275 | 1047 | add_ref(dir, last); |
f4204ab9 JH |
1048 | continue; |
1049 | } | |
1050 | if (last && | |
1051 | refline[0] == '^' && | |
3feb4f0c MH |
1052 | strlen(refline) == PEELED_LINE_LENGTH && |
1053 | refline[PEELED_LINE_LENGTH - 1] == '\n' && | |
c29c46fa | 1054 | !get_sha1_hex(refline + 1, sha1)) { |
593f1bb8 | 1055 | hashcpy(last->u.value.peeled, sha1); |
c29c46fa MH |
1056 | /* |
1057 | * Regardless of what the file header said, | |
1058 | * we definitely know the value of *this* | |
1059 | * reference: | |
1060 | */ | |
1061 | last->flag |= REF_KNOWS_PEELED; | |
1062 | } | |
f4204ab9 | 1063 | } |
f4204ab9 JH |
1064 | } |
1065 | ||
2fff7812 MH |
1066 | /* |
1067 | * Get the packed_ref_cache for the specified ref_cache, creating it | |
1068 | * if necessary. | |
1069 | */ | |
1070 | static struct packed_ref_cache *get_packed_ref_cache(struct ref_cache *refs) | |
5e290ff7 | 1071 | { |
ca919930 JK |
1072 | const char *packed_refs_file; |
1073 | ||
1074 | if (*refs->name) | |
1075 | packed_refs_file = git_path_submodule(refs->name, "packed-refs"); | |
1076 | else | |
1077 | packed_refs_file = git_path("packed-refs"); | |
1078 | ||
1079 | if (refs->packed && | |
1080 | !stat_validity_check(&refs->packed->validity, packed_refs_file)) | |
1081 | clear_packed_ref_cache(refs); | |
1082 | ||
d12229f5 | 1083 | if (!refs->packed) { |
4349a668 | 1084 | FILE *f; |
0bad611b | 1085 | |
2fff7812 | 1086 | refs->packed = xcalloc(1, sizeof(*refs->packed)); |
5f5e2a88 | 1087 | acquire_packed_ref_cache(refs->packed); |
2fff7812 | 1088 | refs->packed->root = create_dir_entry(refs, "", 0, 0); |
4349a668 | 1089 | f = fopen(packed_refs_file, "r"); |
e1e22e37 | 1090 | if (f) { |
ca919930 | 1091 | stat_validity_update(&refs->packed->validity, fileno(f)); |
2fff7812 | 1092 | read_packed_refs(f, get_ref_dir(refs->packed->root)); |
e1e22e37 | 1093 | fclose(f); |
e1e22e37 | 1094 | } |
e1e22e37 | 1095 | } |
2fff7812 MH |
1096 | return refs->packed; |
1097 | } | |
1098 | ||
1099 | static struct ref_dir *get_packed_ref_dir(struct packed_ref_cache *packed_ref_cache) | |
1100 | { | |
1101 | return get_ref_dir(packed_ref_cache->root); | |
1102 | } | |
1103 | ||
1104 | static struct ref_dir *get_packed_refs(struct ref_cache *refs) | |
1105 | { | |
1106 | return get_packed_ref_dir(get_packed_ref_cache(refs)); | |
e1e22e37 LT |
1107 | } |
1108 | ||
30249ee6 MH |
1109 | void add_packed_ref(const char *refname, const unsigned char *sha1) |
1110 | { | |
9f69d297 MH |
1111 | struct packed_ref_cache *packed_ref_cache = |
1112 | get_packed_ref_cache(&ref_cache); | |
1113 | ||
1114 | if (!packed_ref_cache->lock) | |
1115 | die("internal error: packed refs not locked"); | |
1116 | add_ref(get_packed_ref_dir(packed_ref_cache), | |
9da31cb0 | 1117 | create_ref_entry(refname, sha1, REF_ISPACKED, 1)); |
30249ee6 MH |
1118 | } |
1119 | ||
abc39098 | 1120 | /* |
28e6a34e MH |
1121 | * Read the loose references from the namespace dirname into dir |
1122 | * (without recursing). dirname must end with '/'. dir must be the | |
1123 | * directory entry corresponding to dirname. | |
abc39098 | 1124 | */ |
423a1afc | 1125 | static void read_loose_refs(const char *dirname, struct ref_dir *dir) |
e1e22e37 | 1126 | { |
423a1afc | 1127 | struct ref_cache *refs = dir->ref_cache; |
d3177275 | 1128 | DIR *d; |
0bad611b | 1129 | const char *path; |
d5fdae67 | 1130 | struct dirent *de; |
abc39098 | 1131 | int dirnamelen = strlen(dirname); |
72b64b44 | 1132 | struct strbuf refname; |
0bad611b | 1133 | |
3b124823 | 1134 | if (*refs->name) |
66a3d20b | 1135 | path = git_path_submodule(refs->name, "%s", dirname); |
0bad611b | 1136 | else |
66a3d20b | 1137 | path = git_path("%s", dirname); |
0bad611b | 1138 | |
d3177275 | 1139 | d = opendir(path); |
d5fdae67 MH |
1140 | if (!d) |
1141 | return; | |
1142 | ||
66a3d20b MH |
1143 | strbuf_init(&refname, dirnamelen + 257); |
1144 | strbuf_add(&refname, dirname, dirnamelen); | |
d5fdae67 MH |
1145 | |
1146 | while ((de = readdir(d)) != NULL) { | |
1147 | unsigned char sha1[20]; | |
1148 | struct stat st; | |
1149 | int flag; | |
d5fdae67 MH |
1150 | const char *refdir; |
1151 | ||
1152 | if (de->d_name[0] == '.') | |
1153 | continue; | |
d5fdae67 MH |
1154 | if (has_extension(de->d_name, ".lock")) |
1155 | continue; | |
72b64b44 | 1156 | strbuf_addstr(&refname, de->d_name); |
d5fdae67 | 1157 | refdir = *refs->name |
72b64b44 MH |
1158 | ? git_path_submodule(refs->name, "%s", refname.buf) |
1159 | : git_path("%s", refname.buf); | |
1160 | if (stat(refdir, &st) < 0) { | |
1161 | ; /* silently ignore */ | |
1162 | } else if (S_ISDIR(st.st_mode)) { | |
abc39098 | 1163 | strbuf_addch(&refname, '/'); |
28e6a34e | 1164 | add_entry_to_dir(dir, |
b9146f51 RS |
1165 | create_dir_entry(refs, refname.buf, |
1166 | refname.len, 1)); | |
72b64b44 | 1167 | } else { |
3b124823 | 1168 | if (*refs->name) { |
f8948e2f | 1169 | hashclr(sha1); |
0bad611b | 1170 | flag = 0; |
72b64b44 | 1171 | if (resolve_gitlink_ref(refs->name, refname.buf, sha1) < 0) { |
0bad611b | 1172 | hashclr(sha1); |
98ac34b2 | 1173 | flag |= REF_ISBROKEN; |
0bad611b | 1174 | } |
72b64b44 | 1175 | } else if (read_ref_full(refname.buf, sha1, 1, &flag)) { |
09116a1c JH |
1176 | hashclr(sha1); |
1177 | flag |= REF_ISBROKEN; | |
1178 | } | |
9f2fb4a3 MH |
1179 | add_entry_to_dir(dir, |
1180 | create_ref_entry(refname.buf, sha1, flag, 1)); | |
e1e22e37 | 1181 | } |
66a3d20b | 1182 | strbuf_setlen(&refname, dirnamelen); |
e1e22e37 | 1183 | } |
72b64b44 | 1184 | strbuf_release(&refname); |
d5fdae67 | 1185 | closedir(d); |
e1e22e37 LT |
1186 | } |
1187 | ||
d3177275 | 1188 | static struct ref_dir *get_loose_refs(struct ref_cache *refs) |
e1e22e37 | 1189 | { |
d12229f5 | 1190 | if (!refs->loose) { |
28e6a34e MH |
1191 | /* |
1192 | * Mark the top-level directory complete because we | |
1193 | * are about to read the only subdirectory that can | |
1194 | * hold references: | |
1195 | */ | |
b9146f51 | 1196 | refs->loose = create_dir_entry(refs, "", 0, 0); |
28e6a34e MH |
1197 | /* |
1198 | * Create an incomplete entry for "refs/": | |
1199 | */ | |
1200 | add_entry_to_dir(get_ref_dir(refs->loose), | |
b9146f51 | 1201 | create_dir_entry(refs, "refs/", 5, 1)); |
e1e22e37 | 1202 | } |
d7826d54 | 1203 | return get_ref_dir(refs->loose); |
e1e22e37 LT |
1204 | } |
1205 | ||
ca8db142 LT |
1206 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
1207 | #define MAXDEPTH 5 | |
0ebde32c LT |
1208 | #define MAXREFLEN (1024) |
1209 | ||
e5fa45c1 JH |
1210 | /* |
1211 | * Called by resolve_gitlink_ref_recursive() after it failed to read | |
b0626608 MH |
1212 | * from the loose refs in ref_cache refs. Find <refname> in the |
1213 | * packed-refs file for the submodule. | |
e5fa45c1 | 1214 | */ |
b0626608 | 1215 | static int resolve_gitlink_packed_ref(struct ref_cache *refs, |
85be1fe3 | 1216 | const char *refname, unsigned char *sha1) |
0ebde32c | 1217 | { |
2c5c66be | 1218 | struct ref_entry *ref; |
d3177275 | 1219 | struct ref_dir *dir = get_packed_refs(refs); |
0ebde32c | 1220 | |
432ad41e | 1221 | ref = find_ref(dir, refname); |
b0626608 MH |
1222 | if (ref == NULL) |
1223 | return -1; | |
1224 | ||
50546b15 | 1225 | hashcpy(sha1, ref->u.value.sha1); |
b0626608 | 1226 | return 0; |
0ebde32c LT |
1227 | } |
1228 | ||
b0626608 | 1229 | static int resolve_gitlink_ref_recursive(struct ref_cache *refs, |
85be1fe3 | 1230 | const char *refname, unsigned char *sha1, |
dfefa935 | 1231 | int recursion) |
0ebde32c | 1232 | { |
064d51dc | 1233 | int fd, len; |
0ebde32c | 1234 | char buffer[128], *p; |
064d51dc | 1235 | char *path; |
0ebde32c | 1236 | |
064d51dc | 1237 | if (recursion > MAXDEPTH || strlen(refname) > MAXREFLEN) |
0ebde32c | 1238 | return -1; |
064d51dc MH |
1239 | path = *refs->name |
1240 | ? git_path_submodule(refs->name, "%s", refname) | |
1241 | : git_path("%s", refname); | |
1242 | fd = open(path, O_RDONLY); | |
0ebde32c | 1243 | if (fd < 0) |
b0626608 | 1244 | return resolve_gitlink_packed_ref(refs, refname, sha1); |
0ebde32c LT |
1245 | |
1246 | len = read(fd, buffer, sizeof(buffer)-1); | |
1247 | close(fd); | |
1248 | if (len < 0) | |
1249 | return -1; | |
1250 | while (len && isspace(buffer[len-1])) | |
1251 | len--; | |
1252 | buffer[len] = 0; | |
1253 | ||
1254 | /* Was it a detached head or an old-fashioned symlink? */ | |
85be1fe3 | 1255 | if (!get_sha1_hex(buffer, sha1)) |
0ebde32c LT |
1256 | return 0; |
1257 | ||
1258 | /* Symref? */ | |
1259 | if (strncmp(buffer, "ref:", 4)) | |
1260 | return -1; | |
1261 | p = buffer + 4; | |
1262 | while (isspace(*p)) | |
1263 | p++; | |
1264 | ||
064d51dc | 1265 | return resolve_gitlink_ref_recursive(refs, p, sha1, recursion+1); |
0ebde32c LT |
1266 | } |
1267 | ||
85be1fe3 | 1268 | int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1) |
0ebde32c LT |
1269 | { |
1270 | int len = strlen(path), retval; | |
064d51dc | 1271 | char *submodule; |
b0626608 | 1272 | struct ref_cache *refs; |
0ebde32c LT |
1273 | |
1274 | while (len && path[len-1] == '/') | |
1275 | len--; | |
1276 | if (!len) | |
1277 | return -1; | |
b0626608 MH |
1278 | submodule = xstrndup(path, len); |
1279 | refs = get_ref_cache(submodule); | |
1280 | free(submodule); | |
1281 | ||
064d51dc | 1282 | retval = resolve_gitlink_ref_recursive(refs, refname, sha1, 0); |
0ebde32c LT |
1283 | return retval; |
1284 | } | |
ca8db142 | 1285 | |
4886b89f | 1286 | /* |
63331581 MH |
1287 | * Return the ref_entry for the given refname from the packed |
1288 | * references. If it does not exist, return NULL. | |
4886b89f | 1289 | */ |
63331581 | 1290 | static struct ref_entry *get_packed_ref(const char *refname) |
c224ca7f | 1291 | { |
9da31cb0 | 1292 | return find_ref(get_packed_refs(&ref_cache), refname); |
c224ca7f MH |
1293 | } |
1294 | ||
47f534bf MH |
1295 | /* |
1296 | * A loose ref file doesn't exist; check for a packed ref. The | |
1297 | * options are forwarded from resolve_safe_unsafe(). | |
1298 | */ | |
1299 | static const char *handle_missing_loose_ref(const char *refname, | |
1300 | unsigned char *sha1, | |
1301 | int reading, | |
1302 | int *flag) | |
1303 | { | |
1304 | struct ref_entry *entry; | |
1305 | ||
1306 | /* | |
1307 | * The loose reference file does not exist; check for a packed | |
1308 | * reference. | |
1309 | */ | |
1310 | entry = get_packed_ref(refname); | |
1311 | if (entry) { | |
1312 | hashcpy(sha1, entry->u.value.sha1); | |
1313 | if (flag) | |
1314 | *flag |= REF_ISPACKED; | |
1315 | return refname; | |
1316 | } | |
1317 | /* The reference is not a packed reference, either. */ | |
1318 | if (reading) { | |
1319 | return NULL; | |
1320 | } else { | |
1321 | hashclr(sha1); | |
1322 | return refname; | |
1323 | } | |
1324 | } | |
1325 | ||
8d68493f | 1326 | const char *resolve_ref_unsafe(const char *refname, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 1327 | { |
0104ca09 HO |
1328 | int depth = MAXDEPTH; |
1329 | ssize_t len; | |
a876ed83 | 1330 | char buffer[256]; |
dfefa935 | 1331 | static char refname_buffer[256]; |
ca8db142 | 1332 | |
8da19775 JH |
1333 | if (flag) |
1334 | *flag = 0; | |
1335 | ||
dfefa935 | 1336 | if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) |
8384d788 MH |
1337 | return NULL; |
1338 | ||
a876ed83 | 1339 | for (;;) { |
55956350 | 1340 | char path[PATH_MAX]; |
a876ed83 JH |
1341 | struct stat st; |
1342 | char *buf; | |
1343 | int fd; | |
8a65ff76 | 1344 | |
a876ed83 JH |
1345 | if (--depth < 0) |
1346 | return NULL; | |
ca8db142 | 1347 | |
dfefa935 | 1348 | git_snpath(path, sizeof(path), "%s", refname); |
c224ca7f | 1349 | |
fcb7c762 MH |
1350 | /* |
1351 | * We might have to loop back here to avoid a race | |
1352 | * condition: first we lstat() the file, then we try | |
1353 | * to read it as a link or as a file. But if somebody | |
1354 | * changes the type of the file (file <-> directory | |
1355 | * <-> symlink) between the lstat() and reading, then | |
1356 | * we don't want to report that as an error but rather | |
1357 | * try again starting with the lstat(). | |
1358 | */ | |
1359 | stat_ref: | |
a876ed83 | 1360 | if (lstat(path, &st) < 0) { |
47f534bf MH |
1361 | if (errno == ENOENT) |
1362 | return handle_missing_loose_ref(refname, sha1, | |
1363 | reading, flag); | |
1364 | else | |
a876ed83 | 1365 | return NULL; |
a876ed83 | 1366 | } |
ca8db142 | 1367 | |
a876ed83 JH |
1368 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
1369 | if (S_ISLNK(st.st_mode)) { | |
1370 | len = readlink(path, buffer, sizeof(buffer)-1); | |
fcb7c762 MH |
1371 | if (len < 0) { |
1372 | if (errno == ENOENT || errno == EINVAL) | |
1373 | /* inconsistent with lstat; retry */ | |
1374 | goto stat_ref; | |
1375 | else | |
1376 | return NULL; | |
1377 | } | |
b54cb795 | 1378 | buffer[len] = 0; |
59556548 | 1379 | if (starts_with(buffer, "refs/") && |
1f58a038 | 1380 | !check_refname_format(buffer, 0)) { |
dfefa935 MH |
1381 | strcpy(refname_buffer, buffer); |
1382 | refname = refname_buffer; | |
8da19775 JH |
1383 | if (flag) |
1384 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
1385 | continue; |
1386 | } | |
ca8db142 | 1387 | } |
a876ed83 | 1388 | |
7a21632f DS |
1389 | /* Is it a directory? */ |
1390 | if (S_ISDIR(st.st_mode)) { | |
1391 | errno = EISDIR; | |
1392 | return NULL; | |
1393 | } | |
1394 | ||
a876ed83 JH |
1395 | /* |
1396 | * Anything else, just open it and try to use it as | |
1397 | * a ref | |
1398 | */ | |
1399 | fd = open(path, O_RDONLY); | |
fcb7c762 MH |
1400 | if (fd < 0) { |
1401 | if (errno == ENOENT) | |
1402 | /* inconsistent with lstat; retry */ | |
1403 | goto stat_ref; | |
1404 | else | |
1405 | return NULL; | |
1406 | } | |
93d26e4c | 1407 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
a876ed83 | 1408 | close(fd); |
28775050 MH |
1409 | if (len < 0) |
1410 | return NULL; | |
1411 | while (len && isspace(buffer[len-1])) | |
1412 | len--; | |
1413 | buffer[len] = '\0'; | |
a876ed83 JH |
1414 | |
1415 | /* | |
1416 | * Is it a symbolic ref? | |
1417 | */ | |
59556548 | 1418 | if (!starts_with(buffer, "ref:")) { |
2884c06a MH |
1419 | /* |
1420 | * Please note that FETCH_HEAD has a second | |
1421 | * line containing other data. | |
1422 | */ | |
1423 | if (get_sha1_hex(buffer, sha1) || | |
1424 | (buffer[40] != '\0' && !isspace(buffer[40]))) { | |
1425 | if (flag) | |
1426 | *flag |= REF_ISBROKEN; | |
1427 | return NULL; | |
1428 | } | |
1429 | return refname; | |
1430 | } | |
55956350 JH |
1431 | if (flag) |
1432 | *flag |= REF_ISSYMREF; | |
a876ed83 | 1433 | buf = buffer + 4; |
28775050 MH |
1434 | while (isspace(*buf)) |
1435 | buf++; | |
313fb010 | 1436 | if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) { |
55956350 JH |
1437 | if (flag) |
1438 | *flag |= REF_ISBROKEN; | |
313fb010 MH |
1439 | return NULL; |
1440 | } | |
dfefa935 | 1441 | refname = strcpy(refname_buffer, buf); |
8a65ff76 | 1442 | } |
a876ed83 JH |
1443 | } |
1444 | ||
96ec7b1e NTND |
1445 | char *resolve_refdup(const char *ref, unsigned char *sha1, int reading, int *flag) |
1446 | { | |
8cad4744 | 1447 | const char *ret = resolve_ref_unsafe(ref, sha1, reading, flag); |
96ec7b1e NTND |
1448 | return ret ? xstrdup(ret) : NULL; |
1449 | } | |
1450 | ||
d08bae7e IL |
1451 | /* The argument to filter_refs */ |
1452 | struct ref_filter { | |
1453 | const char *pattern; | |
1454 | each_ref_fn *fn; | |
1455 | void *cb_data; | |
1456 | }; | |
1457 | ||
dfefa935 | 1458 | int read_ref_full(const char *refname, unsigned char *sha1, int reading, int *flags) |
a876ed83 | 1459 | { |
8d68493f | 1460 | if (resolve_ref_unsafe(refname, sha1, reading, flags)) |
a876ed83 JH |
1461 | return 0; |
1462 | return -1; | |
8a65ff76 LT |
1463 | } |
1464 | ||
dfefa935 | 1465 | int read_ref(const char *refname, unsigned char *sha1) |
c6893323 | 1466 | { |
dfefa935 | 1467 | return read_ref_full(refname, sha1, 1, NULL); |
c6893323 NTND |
1468 | } |
1469 | ||
bc5fd6d3 | 1470 | int ref_exists(const char *refname) |
ef06b918 | 1471 | { |
bc5fd6d3 MH |
1472 | unsigned char sha1[20]; |
1473 | return !!resolve_ref_unsafe(refname, sha1, 1, NULL); | |
ef06b918 JH |
1474 | } |
1475 | ||
85be1fe3 | 1476 | static int filter_refs(const char *refname, const unsigned char *sha1, int flags, |
dfefa935 | 1477 | void *data) |
d08bae7e IL |
1478 | { |
1479 | struct ref_filter *filter = (struct ref_filter *)data; | |
eb07894f | 1480 | if (wildmatch(filter->pattern, refname, 0, NULL)) |
d08bae7e | 1481 | return 0; |
85be1fe3 | 1482 | return filter->fn(refname, sha1, flags, filter->cb_data); |
d08bae7e IL |
1483 | } |
1484 | ||
68cf8703 MH |
1485 | enum peel_status { |
1486 | /* object was peeled successfully: */ | |
1487 | PEEL_PEELED = 0, | |
1488 | ||
1489 | /* | |
1490 | * object cannot be peeled because the named object (or an | |
1491 | * object referred to by a tag in the peel chain), does not | |
1492 | * exist. | |
1493 | */ | |
1494 | PEEL_INVALID = -1, | |
1495 | ||
1496 | /* object cannot be peeled because it is not a tag: */ | |
9a489f3c MH |
1497 | PEEL_NON_TAG = -2, |
1498 | ||
1499 | /* ref_entry contains no peeled value because it is a symref: */ | |
1500 | PEEL_IS_SYMREF = -3, | |
1501 | ||
1502 | /* | |
1503 | * ref_entry cannot be peeled because it is broken (i.e., the | |
1504 | * symbolic reference cannot even be resolved to an object | |
1505 | * name): | |
1506 | */ | |
1507 | PEEL_BROKEN = -4 | |
68cf8703 MH |
1508 | }; |
1509 | ||
cb2ae1c4 MH |
1510 | /* |
1511 | * Peel the named object; i.e., if the object is a tag, resolve the | |
68cf8703 MH |
1512 | * tag recursively until a non-tag is found. If successful, store the |
1513 | * result to sha1 and return PEEL_PEELED. If the object is not a tag | |
1514 | * or is not valid, return PEEL_NON_TAG or PEEL_INVALID, respectively, | |
1515 | * and leave sha1 unchanged. | |
cb2ae1c4 | 1516 | */ |
68cf8703 | 1517 | static enum peel_status peel_object(const unsigned char *name, unsigned char *sha1) |
cb2ae1c4 MH |
1518 | { |
1519 | struct object *o = lookup_unknown_object(name); | |
1520 | ||
1521 | if (o->type == OBJ_NONE) { | |
1522 | int type = sha1_object_info(name, NULL); | |
c4ad00f8 | 1523 | if (type < 0 || !object_as_type(o, type, 0)) |
68cf8703 | 1524 | return PEEL_INVALID; |
cb2ae1c4 MH |
1525 | } |
1526 | ||
1527 | if (o->type != OBJ_TAG) | |
68cf8703 | 1528 | return PEEL_NON_TAG; |
cb2ae1c4 MH |
1529 | |
1530 | o = deref_tag_noverify(o); | |
1531 | if (!o) | |
68cf8703 | 1532 | return PEEL_INVALID; |
cb2ae1c4 MH |
1533 | |
1534 | hashcpy(sha1, o->sha1); | |
68cf8703 | 1535 | return PEEL_PEELED; |
cb2ae1c4 MH |
1536 | } |
1537 | ||
9a489f3c | 1538 | /* |
f85354b5 MH |
1539 | * Peel the entry (if possible) and return its new peel_status. If |
1540 | * repeel is true, re-peel the entry even if there is an old peeled | |
1541 | * value that is already stored in it. | |
694b7a19 MH |
1542 | * |
1543 | * It is OK to call this function with a packed reference entry that | |
1544 | * might be stale and might even refer to an object that has since | |
1545 | * been garbage-collected. In such a case, if the entry has | |
1546 | * REF_KNOWS_PEELED then leave the status unchanged and return | |
1547 | * PEEL_PEELED or PEEL_NON_TAG; otherwise, return PEEL_INVALID. | |
9a489f3c | 1548 | */ |
f85354b5 | 1549 | static enum peel_status peel_entry(struct ref_entry *entry, int repeel) |
9a489f3c MH |
1550 | { |
1551 | enum peel_status status; | |
1552 | ||
f85354b5 MH |
1553 | if (entry->flag & REF_KNOWS_PEELED) { |
1554 | if (repeel) { | |
1555 | entry->flag &= ~REF_KNOWS_PEELED; | |
1556 | hashclr(entry->u.value.peeled); | |
1557 | } else { | |
1558 | return is_null_sha1(entry->u.value.peeled) ? | |
1559 | PEEL_NON_TAG : PEEL_PEELED; | |
1560 | } | |
1561 | } | |
9a489f3c MH |
1562 | if (entry->flag & REF_ISBROKEN) |
1563 | return PEEL_BROKEN; | |
1564 | if (entry->flag & REF_ISSYMREF) | |
1565 | return PEEL_IS_SYMREF; | |
1566 | ||
1567 | status = peel_object(entry->u.value.sha1, entry->u.value.peeled); | |
1568 | if (status == PEEL_PEELED || status == PEEL_NON_TAG) | |
1569 | entry->flag |= REF_KNOWS_PEELED; | |
1570 | return status; | |
1571 | } | |
1572 | ||
dfefa935 | 1573 | int peel_ref(const char *refname, unsigned char *sha1) |
cf0adba7 JH |
1574 | { |
1575 | int flag; | |
1576 | unsigned char base[20]; | |
cf0adba7 | 1577 | |
dfefa935 | 1578 | if (current_ref && (current_ref->name == refname |
9a489f3c | 1579 | || !strcmp(current_ref->name, refname))) { |
f85354b5 | 1580 | if (peel_entry(current_ref, 0)) |
9a489f3c MH |
1581 | return -1; |
1582 | hashcpy(sha1, current_ref->u.value.peeled); | |
1583 | return 0; | |
0ae91be0 SP |
1584 | } |
1585 | ||
dfefa935 | 1586 | if (read_ref_full(refname, base, 1, &flag)) |
cf0adba7 JH |
1587 | return -1; |
1588 | ||
9a489f3c MH |
1589 | /* |
1590 | * If the reference is packed, read its ref_entry from the | |
1591 | * cache in the hope that we already know its peeled value. | |
1592 | * We only try this optimization on packed references because | |
1593 | * (a) forcing the filling of the loose reference cache could | |
1594 | * be expensive and (b) loose references anyway usually do not | |
1595 | * have REF_KNOWS_PEELED. | |
1596 | */ | |
1597 | if (flag & REF_ISPACKED) { | |
f361baeb | 1598 | struct ref_entry *r = get_packed_ref(refname); |
9a489f3c | 1599 | if (r) { |
f85354b5 | 1600 | if (peel_entry(r, 0)) |
9a489f3c | 1601 | return -1; |
593f1bb8 | 1602 | hashcpy(sha1, r->u.value.peeled); |
e9c4c111 | 1603 | return 0; |
cf0adba7 | 1604 | } |
cf0adba7 JH |
1605 | } |
1606 | ||
cb2ae1c4 | 1607 | return peel_object(base, sha1); |
cf0adba7 JH |
1608 | } |
1609 | ||
bc5fd6d3 MH |
1610 | struct warn_if_dangling_data { |
1611 | FILE *fp; | |
1612 | const char *refname; | |
e6bea66d | 1613 | const struct string_list *refnames; |
bc5fd6d3 MH |
1614 | const char *msg_fmt; |
1615 | }; | |
1616 | ||
1617 | static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1, | |
1618 | int flags, void *cb_data) | |
1619 | { | |
1620 | struct warn_if_dangling_data *d = cb_data; | |
1621 | const char *resolves_to; | |
1622 | unsigned char junk[20]; | |
1623 | ||
1624 | if (!(flags & REF_ISSYMREF)) | |
1625 | return 0; | |
1626 | ||
1627 | resolves_to = resolve_ref_unsafe(refname, junk, 0, NULL); | |
e6bea66d JL |
1628 | if (!resolves_to |
1629 | || (d->refname | |
1630 | ? strcmp(resolves_to, d->refname) | |
1631 | : !string_list_has_string(d->refnames, resolves_to))) { | |
bc5fd6d3 | 1632 | return 0; |
e6bea66d | 1633 | } |
bc5fd6d3 MH |
1634 | |
1635 | fprintf(d->fp, d->msg_fmt, refname); | |
1be65eda | 1636 | fputc('\n', d->fp); |
bc5fd6d3 MH |
1637 | return 0; |
1638 | } | |
1639 | ||
1640 | void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname) | |
1641 | { | |
1642 | struct warn_if_dangling_data data; | |
1643 | ||
1644 | data.fp = fp; | |
1645 | data.refname = refname; | |
e6bea66d JL |
1646 | data.refnames = NULL; |
1647 | data.msg_fmt = msg_fmt; | |
1648 | for_each_rawref(warn_if_dangling_symref, &data); | |
1649 | } | |
1650 | ||
1651 | void warn_dangling_symrefs(FILE *fp, const char *msg_fmt, const struct string_list *refnames) | |
1652 | { | |
1653 | struct warn_if_dangling_data data; | |
1654 | ||
1655 | data.fp = fp; | |
1656 | data.refname = NULL; | |
1657 | data.refnames = refnames; | |
bc5fd6d3 MH |
1658 | data.msg_fmt = msg_fmt; |
1659 | for_each_rawref(warn_if_dangling_symref, &data); | |
1660 | } | |
1661 | ||
fcce1703 | 1662 | /* |
65cf102b | 1663 | * Call fn for each reference in the specified ref_cache, omitting |
624cac35 MH |
1664 | * references not in the containing_dir of base. fn is called for all |
1665 | * references, including broken ones. If fn ever returns a non-zero | |
fcce1703 MH |
1666 | * value, stop the iteration and return that value; otherwise, return |
1667 | * 0. | |
1668 | */ | |
65cf102b | 1669 | static int do_for_each_entry(struct ref_cache *refs, const char *base, |
624cac35 | 1670 | each_ref_entry_fn fn, void *cb_data) |
8a65ff76 | 1671 | { |
98eeb09e JK |
1672 | struct packed_ref_cache *packed_ref_cache; |
1673 | struct ref_dir *loose_dir; | |
1674 | struct ref_dir *packed_dir; | |
933ac036 MH |
1675 | int retval = 0; |
1676 | ||
98eeb09e JK |
1677 | /* |
1678 | * We must make sure that all loose refs are read before accessing the | |
1679 | * packed-refs file; this avoids a race condition in which loose refs | |
1680 | * are migrated to the packed-refs file by a simultaneous process, but | |
1681 | * our in-memory view is from before the migration. get_packed_ref_cache() | |
1682 | * takes care of making sure our view is up to date with what is on | |
1683 | * disk. | |
1684 | */ | |
1685 | loose_dir = get_loose_refs(refs); | |
933ac036 | 1686 | if (base && *base) { |
933ac036 MH |
1687 | loose_dir = find_containing_dir(loose_dir, base, 0); |
1688 | } | |
98eeb09e JK |
1689 | if (loose_dir) |
1690 | prime_ref_dir(loose_dir); | |
1691 | ||
1692 | packed_ref_cache = get_packed_ref_cache(refs); | |
8baf2bb9 | 1693 | acquire_packed_ref_cache(packed_ref_cache); |
98eeb09e | 1694 | packed_dir = get_packed_ref_dir(packed_ref_cache); |
933ac036 MH |
1695 | if (base && *base) { |
1696 | packed_dir = find_containing_dir(packed_dir, base, 0); | |
933ac036 MH |
1697 | } |
1698 | ||
1699 | if (packed_dir && loose_dir) { | |
1700 | sort_ref_dir(packed_dir); | |
1701 | sort_ref_dir(loose_dir); | |
624cac35 MH |
1702 | retval = do_for_each_entry_in_dirs( |
1703 | packed_dir, loose_dir, fn, cb_data); | |
933ac036 MH |
1704 | } else if (packed_dir) { |
1705 | sort_ref_dir(packed_dir); | |
624cac35 MH |
1706 | retval = do_for_each_entry_in_dir( |
1707 | packed_dir, 0, fn, cb_data); | |
933ac036 MH |
1708 | } else if (loose_dir) { |
1709 | sort_ref_dir(loose_dir); | |
624cac35 MH |
1710 | retval = do_for_each_entry_in_dir( |
1711 | loose_dir, 0, fn, cb_data); | |
933ac036 MH |
1712 | } |
1713 | ||
8baf2bb9 | 1714 | release_packed_ref_cache(packed_ref_cache); |
933ac036 | 1715 | return retval; |
8a65ff76 LT |
1716 | } |
1717 | ||
624cac35 | 1718 | /* |
65cf102b | 1719 | * Call fn for each reference in the specified ref_cache for which the |
624cac35 MH |
1720 | * refname begins with base. If trim is non-zero, then trim that many |
1721 | * characters off the beginning of each refname before passing the | |
1722 | * refname to fn. flags can be DO_FOR_EACH_INCLUDE_BROKEN to include | |
1723 | * broken references in the iteration. If fn ever returns a non-zero | |
1724 | * value, stop the iteration and return that value; otherwise, return | |
1725 | * 0. | |
1726 | */ | |
65cf102b MH |
1727 | static int do_for_each_ref(struct ref_cache *refs, const char *base, |
1728 | each_ref_fn fn, int trim, int flags, void *cb_data) | |
624cac35 MH |
1729 | { |
1730 | struct ref_entry_cb data; | |
1731 | data.base = base; | |
1732 | data.trim = trim; | |
1733 | data.flags = flags; | |
1734 | data.fn = fn; | |
1735 | data.cb_data = cb_data; | |
1736 | ||
65cf102b | 1737 | return do_for_each_entry(refs, base, do_one_ref, &data); |
624cac35 MH |
1738 | } |
1739 | ||
0bad611b | 1740 | static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data) |
723c31fe LT |
1741 | { |
1742 | unsigned char sha1[20]; | |
8da19775 JH |
1743 | int flag; |
1744 | ||
0bad611b HV |
1745 | if (submodule) { |
1746 | if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0) | |
1747 | return fn("HEAD", sha1, 0, cb_data); | |
1748 | ||
1749 | return 0; | |
1750 | } | |
1751 | ||
c6893323 | 1752 | if (!read_ref_full("HEAD", sha1, 1, &flag)) |
8da19775 | 1753 | return fn("HEAD", sha1, flag, cb_data); |
0bad611b | 1754 | |
2f34ba32 | 1755 | return 0; |
723c31fe LT |
1756 | } |
1757 | ||
0bad611b HV |
1758 | int head_ref(each_ref_fn fn, void *cb_data) |
1759 | { | |
1760 | return do_head_ref(NULL, fn, cb_data); | |
1761 | } | |
1762 | ||
9ef6aeb0 HV |
1763 | int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
1764 | { | |
1765 | return do_head_ref(submodule, fn, cb_data); | |
1766 | } | |
1767 | ||
cb5d709f | 1768 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 1769 | { |
9da31cb0 | 1770 | return do_for_each_ref(&ref_cache, "", fn, 0, 0, cb_data); |
a62be77f SE |
1771 | } |
1772 | ||
9ef6aeb0 HV |
1773 | int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
1774 | { | |
65cf102b | 1775 | return do_for_each_ref(get_ref_cache(submodule), "", fn, 0, 0, cb_data); |
a62be77f SE |
1776 | } |
1777 | ||
2a8177b6 CC |
1778 | int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data) |
1779 | { | |
9da31cb0 | 1780 | return do_for_each_ref(&ref_cache, prefix, fn, strlen(prefix), 0, cb_data); |
2a8177b6 CC |
1781 | } |
1782 | ||
9ef6aeb0 HV |
1783 | int for_each_ref_in_submodule(const char *submodule, const char *prefix, |
1784 | each_ref_fn fn, void *cb_data) | |
1785 | { | |
65cf102b | 1786 | return do_for_each_ref(get_ref_cache(submodule), prefix, fn, strlen(prefix), 0, cb_data); |
2a8177b6 CC |
1787 | } |
1788 | ||
cb5d709f | 1789 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 1790 | { |
2a8177b6 | 1791 | return for_each_ref_in("refs/tags/", fn, cb_data); |
a62be77f SE |
1792 | } |
1793 | ||
9ef6aeb0 HV |
1794 | int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
1795 | { | |
1796 | return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data); | |
1797 | } | |
1798 | ||
cb5d709f | 1799 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 1800 | { |
2a8177b6 | 1801 | return for_each_ref_in("refs/heads/", fn, cb_data); |
a62be77f SE |
1802 | } |
1803 | ||
9ef6aeb0 HV |
1804 | int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
1805 | { | |
1806 | return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data); | |
1807 | } | |
1808 | ||
cb5d709f | 1809 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 1810 | { |
2a8177b6 | 1811 | return for_each_ref_in("refs/remotes/", fn, cb_data); |
f8948e2f JH |
1812 | } |
1813 | ||
9ef6aeb0 HV |
1814 | int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
1815 | { | |
1816 | return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data); | |
1817 | } | |
1818 | ||
29268700 CC |
1819 | int for_each_replace_ref(each_ref_fn fn, void *cb_data) |
1820 | { | |
9da31cb0 | 1821 | return do_for_each_ref(&ref_cache, "refs/replace/", fn, 13, 0, cb_data); |
29268700 CC |
1822 | } |
1823 | ||
a1bea2c1 JT |
1824 | int head_ref_namespaced(each_ref_fn fn, void *cb_data) |
1825 | { | |
1826 | struct strbuf buf = STRBUF_INIT; | |
1827 | int ret = 0; | |
1828 | unsigned char sha1[20]; | |
1829 | int flag; | |
1830 | ||
1831 | strbuf_addf(&buf, "%sHEAD", get_git_namespace()); | |
c6893323 | 1832 | if (!read_ref_full(buf.buf, sha1, 1, &flag)) |
a1bea2c1 JT |
1833 | ret = fn(buf.buf, sha1, flag, cb_data); |
1834 | strbuf_release(&buf); | |
1835 | ||
1836 | return ret; | |
1837 | } | |
1838 | ||
1839 | int for_each_namespaced_ref(each_ref_fn fn, void *cb_data) | |
1840 | { | |
1841 | struct strbuf buf = STRBUF_INIT; | |
1842 | int ret; | |
1843 | strbuf_addf(&buf, "%srefs/", get_git_namespace()); | |
9da31cb0 | 1844 | ret = do_for_each_ref(&ref_cache, buf.buf, fn, 0, 0, cb_data); |
a1bea2c1 JT |
1845 | strbuf_release(&buf); |
1846 | return ret; | |
1847 | } | |
1848 | ||
b09fe971 IL |
1849 | int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, |
1850 | const char *prefix, void *cb_data) | |
d08bae7e IL |
1851 | { |
1852 | struct strbuf real_pattern = STRBUF_INIT; | |
1853 | struct ref_filter filter; | |
d08bae7e IL |
1854 | int ret; |
1855 | ||
59556548 | 1856 | if (!prefix && !starts_with(pattern, "refs/")) |
d08bae7e | 1857 | strbuf_addstr(&real_pattern, "refs/"); |
b09fe971 IL |
1858 | else if (prefix) |
1859 | strbuf_addstr(&real_pattern, prefix); | |
d08bae7e IL |
1860 | strbuf_addstr(&real_pattern, pattern); |
1861 | ||
894a9d33 | 1862 | if (!has_glob_specials(pattern)) { |
9517e6b8 | 1863 | /* Append implied '/' '*' if not present. */ |
d08bae7e IL |
1864 | if (real_pattern.buf[real_pattern.len - 1] != '/') |
1865 | strbuf_addch(&real_pattern, '/'); | |
1866 | /* No need to check for '*', there is none. */ | |
1867 | strbuf_addch(&real_pattern, '*'); | |
1868 | } | |
1869 | ||
1870 | filter.pattern = real_pattern.buf; | |
1871 | filter.fn = fn; | |
1872 | filter.cb_data = cb_data; | |
1873 | ret = for_each_ref(filter_refs, &filter); | |
1874 | ||
1875 | strbuf_release(&real_pattern); | |
1876 | return ret; | |
1877 | } | |
1878 | ||
b09fe971 IL |
1879 | int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data) |
1880 | { | |
1881 | return for_each_glob_ref_in(fn, pattern, NULL, cb_data); | |
1882 | } | |
1883 | ||
f8948e2f JH |
1884 | int for_each_rawref(each_ref_fn fn, void *cb_data) |
1885 | { | |
9da31cb0 | 1886 | return do_for_each_ref(&ref_cache, "", fn, 0, |
f8948e2f | 1887 | DO_FOR_EACH_INCLUDE_BROKEN, cb_data); |
8a65ff76 LT |
1888 | } |
1889 | ||
4577e483 | 1890 | const char *prettify_refname(const char *name) |
a9c37a72 | 1891 | { |
a9c37a72 | 1892 | return name + ( |
59556548 CC |
1893 | starts_with(name, "refs/heads/") ? 11 : |
1894 | starts_with(name, "refs/tags/") ? 10 : | |
1895 | starts_with(name, "refs/remotes/") ? 13 : | |
a9c37a72 DB |
1896 | 0); |
1897 | } | |
1898 | ||
54457fe5 | 1899 | static const char *ref_rev_parse_rules[] = { |
79803322 SP |
1900 | "%.*s", |
1901 | "refs/%.*s", | |
1902 | "refs/tags/%.*s", | |
1903 | "refs/heads/%.*s", | |
1904 | "refs/remotes/%.*s", | |
1905 | "refs/remotes/%.*s/HEAD", | |
1906 | NULL | |
1907 | }; | |
1908 | ||
54457fe5 | 1909 | int refname_match(const char *abbrev_name, const char *full_name) |
79803322 SP |
1910 | { |
1911 | const char **p; | |
1912 | const int abbrev_name_len = strlen(abbrev_name); | |
1913 | ||
54457fe5 | 1914 | for (p = ref_rev_parse_rules; *p; p++) { |
79803322 SP |
1915 | if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { |
1916 | return 1; | |
1917 | } | |
1918 | } | |
1919 | ||
1920 | return 0; | |
1921 | } | |
1922 | ||
e5f38ec3 | 1923 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
1924 | const unsigned char *old_sha1, int mustexist) |
1925 | { | |
c6893323 | 1926 | if (read_ref_full(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 1927 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
1928 | unlock_ref(lock); |
1929 | return NULL; | |
1930 | } | |
a89fccd2 | 1931 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 1932 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
1933 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
1934 | unlock_ref(lock); | |
1935 | return NULL; | |
1936 | } | |
1937 | return lock; | |
1938 | } | |
1939 | ||
7155b727 | 1940 | static int remove_empty_directories(const char *file) |
bc7127ef JH |
1941 | { |
1942 | /* we want to create a file but there is a directory there; | |
1943 | * if that is an empty directory (or a directory that contains | |
1944 | * only empty directories), remove them. | |
1945 | */ | |
7155b727 JS |
1946 | struct strbuf path; |
1947 | int result; | |
bc7127ef | 1948 | |
7155b727 JS |
1949 | strbuf_init(&path, 20); |
1950 | strbuf_addstr(&path, file); | |
1951 | ||
a0f4afbe | 1952 | result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY); |
7155b727 JS |
1953 | |
1954 | strbuf_release(&path); | |
1955 | ||
1956 | return result; | |
bc7127ef JH |
1957 | } |
1958 | ||
ff74f7f1 JH |
1959 | /* |
1960 | * *string and *len will only be substituted, and *string returned (for | |
1961 | * later free()ing) if the string passed in is a magic short-hand form | |
1962 | * to name a branch. | |
1963 | */ | |
1964 | static char *substitute_branch_name(const char **string, int *len) | |
1965 | { | |
1966 | struct strbuf buf = STRBUF_INIT; | |
cf99a761 | 1967 | int ret = interpret_branch_name(*string, *len, &buf); |
ff74f7f1 JH |
1968 | |
1969 | if (ret == *len) { | |
1970 | size_t size; | |
1971 | *string = strbuf_detach(&buf, &size); | |
1972 | *len = size; | |
1973 | return (char *)*string; | |
1974 | } | |
1975 | ||
1976 | return NULL; | |
1977 | } | |
1978 | ||
1979 | int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref) | |
1980 | { | |
1981 | char *last_branch = substitute_branch_name(&str, &len); | |
1982 | const char **p, *r; | |
1983 | int refs_found = 0; | |
1984 | ||
1985 | *ref = NULL; | |
1986 | for (p = ref_rev_parse_rules; *p; p++) { | |
1987 | char fullref[PATH_MAX]; | |
1988 | unsigned char sha1_from_ref[20]; | |
1989 | unsigned char *this_result; | |
1990 | int flag; | |
1991 | ||
1992 | this_result = refs_found ? sha1_from_ref : sha1; | |
1993 | mksnpath(fullref, sizeof(fullref), *p, len, str); | |
8cad4744 | 1994 | r = resolve_ref_unsafe(fullref, this_result, 1, &flag); |
ff74f7f1 JH |
1995 | if (r) { |
1996 | if (!refs_found++) | |
1997 | *ref = xstrdup(r); | |
1998 | if (!warn_ambiguous_refs) | |
1999 | break; | |
55956350 | 2000 | } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) { |
ff74f7f1 | 2001 | warning("ignoring dangling symref %s.", fullref); |
55956350 JH |
2002 | } else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) { |
2003 | warning("ignoring broken ref %s.", fullref); | |
2004 | } | |
ff74f7f1 JH |
2005 | } |
2006 | free(last_branch); | |
2007 | return refs_found; | |
2008 | } | |
2009 | ||
2010 | int dwim_log(const char *str, int len, unsigned char *sha1, char **log) | |
2011 | { | |
2012 | char *last_branch = substitute_branch_name(&str, &len); | |
2013 | const char **p; | |
2014 | int logs_found = 0; | |
2015 | ||
2016 | *log = NULL; | |
2017 | for (p = ref_rev_parse_rules; *p; p++) { | |
2018 | struct stat st; | |
2019 | unsigned char hash[20]; | |
2020 | char path[PATH_MAX]; | |
2021 | const char *ref, *it; | |
2022 | ||
2023 | mksnpath(path, sizeof(path), *p, len, str); | |
8cad4744 | 2024 | ref = resolve_ref_unsafe(path, hash, 1, NULL); |
ff74f7f1 JH |
2025 | if (!ref) |
2026 | continue; | |
2027 | if (!stat(git_path("logs/%s", path), &st) && | |
2028 | S_ISREG(st.st_mode)) | |
2029 | it = path; | |
2030 | else if (strcmp(ref, path) && | |
2031 | !stat(git_path("logs/%s", ref), &st) && | |
2032 | S_ISREG(st.st_mode)) | |
2033 | it = ref; | |
2034 | else | |
2035 | continue; | |
2036 | if (!logs_found++) { | |
2037 | *log = xstrdup(it); | |
2038 | hashcpy(sha1, hash); | |
2039 | } | |
2040 | if (!warn_ambiguous_refs) | |
2041 | break; | |
2042 | } | |
2043 | free(last_branch); | |
2044 | return logs_found; | |
2045 | } | |
2046 | ||
dfefa935 MH |
2047 | static struct ref_lock *lock_ref_sha1_basic(const char *refname, |
2048 | const unsigned char *old_sha1, | |
2049 | int flags, int *type_p) | |
4bd18c43 | 2050 | { |
434cd0cd | 2051 | char *ref_file; |
dfefa935 | 2052 | const char *orig_refname = refname; |
4bd18c43 | 2053 | struct ref_lock *lock; |
5cc3cef9 | 2054 | int last_errno = 0; |
acd3b9ec | 2055 | int type, lflags; |
4431fcc4 | 2056 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
5bdd8d4a | 2057 | int missing = 0; |
c4c61c76 | 2058 | int attempts_remaining = 3; |
4bd18c43 SP |
2059 | |
2060 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
2061 | lock->lock_fd = -1; | |
2062 | ||
8d68493f | 2063 | refname = resolve_ref_unsafe(refname, lock->old_sha1, mustexist, &type); |
dfefa935 | 2064 | if (!refname && errno == EISDIR) { |
bc7127ef JH |
2065 | /* we are trying to lock foo but we used to |
2066 | * have foo/bar which now does not exist; | |
2067 | * it is normal for the empty directory 'foo' | |
2068 | * to remain. | |
2069 | */ | |
dfefa935 | 2070 | ref_file = git_path("%s", orig_refname); |
5cc3cef9 JH |
2071 | if (remove_empty_directories(ref_file)) { |
2072 | last_errno = errno; | |
dfefa935 | 2073 | error("there are still refs under '%s'", orig_refname); |
5cc3cef9 JH |
2074 | goto error_return; |
2075 | } | |
8d68493f | 2076 | refname = resolve_ref_unsafe(orig_refname, lock->old_sha1, mustexist, &type); |
bc7127ef | 2077 | } |
68db31cc SV |
2078 | if (type_p) |
2079 | *type_p = type; | |
dfefa935 | 2080 | if (!refname) { |
5cc3cef9 | 2081 | last_errno = errno; |
818f477c | 2082 | error("unable to resolve reference %s: %s", |
dfefa935 | 2083 | orig_refname, strerror(errno)); |
5cc3cef9 | 2084 | goto error_return; |
4bd18c43 | 2085 | } |
5bdd8d4a | 2086 | missing = is_null_sha1(lock->old_sha1); |
c976d415 LH |
2087 | /* When the ref did not exist and we are creating it, |
2088 | * make sure there is no existing ref that is packed | |
2089 | * whose name begins with our refname, nor a ref whose | |
2090 | * name is a proper prefix of our refname. | |
2091 | */ | |
5bdd8d4a | 2092 | if (missing && |
9da31cb0 | 2093 | !is_refname_available(refname, NULL, get_packed_refs(&ref_cache))) { |
f475e08e | 2094 | last_errno = ENOTDIR; |
c976d415 | 2095 | goto error_return; |
f475e08e | 2096 | } |
22a3844e | 2097 | |
c33d5174 | 2098 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 2099 | |
e5c223e9 | 2100 | lflags = 0; |
acd3b9ec | 2101 | if (flags & REF_NODEREF) { |
dfefa935 | 2102 | refname = orig_refname; |
acd3b9ec JH |
2103 | lflags |= LOCK_NODEREF; |
2104 | } | |
dfefa935 MH |
2105 | lock->ref_name = xstrdup(refname); |
2106 | lock->orig_ref_name = xstrdup(orig_refname); | |
2107 | ref_file = git_path("%s", refname); | |
5bdd8d4a | 2108 | if (missing) |
68db31cc SV |
2109 | lock->force_write = 1; |
2110 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
2111 | lock->force_write = 1; | |
4bd18c43 | 2112 | |
c4c61c76 MH |
2113 | retry: |
2114 | switch (safe_create_leading_directories(ref_file)) { | |
2115 | case SCLD_OK: | |
2116 | break; /* success */ | |
2117 | case SCLD_VANISHED: | |
2118 | if (--attempts_remaining > 0) | |
2119 | goto retry; | |
2120 | /* fall through */ | |
2121 | default: | |
5cc3cef9 JH |
2122 | last_errno = errno; |
2123 | error("unable to create directory for %s", ref_file); | |
2124 | goto error_return; | |
2125 | } | |
4bd18c43 | 2126 | |
acd3b9ec | 2127 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags); |
e5c223e9 MH |
2128 | if (lock->lock_fd < 0) { |
2129 | if (errno == ENOENT && --attempts_remaining > 0) | |
2130 | /* | |
2131 | * Maybe somebody just deleted one of the | |
2132 | * directories leading to ref_file. Try | |
2133 | * again: | |
2134 | */ | |
2135 | goto retry; | |
2136 | else | |
2137 | unable_to_lock_index_die(ref_file, errno); | |
2138 | } | |
4bd18c43 | 2139 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; |
5cc3cef9 JH |
2140 | |
2141 | error_return: | |
2142 | unlock_ref(lock); | |
2143 | errno = last_errno; | |
2144 | return NULL; | |
4bd18c43 SP |
2145 | } |
2146 | ||
dfefa935 | 2147 | struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha1) |
95fc7512 | 2148 | { |
53cce84c | 2149 | char refpath[PATH_MAX]; |
dfefa935 | 2150 | if (check_refname_format(refname, 0)) |
4bd18c43 | 2151 | return NULL; |
dfefa935 | 2152 | strcpy(refpath, mkpath("refs/%s", refname)); |
68db31cc | 2153 | return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL); |
4bd18c43 SP |
2154 | } |
2155 | ||
dfefa935 | 2156 | struct ref_lock *lock_any_ref_for_update(const char *refname, |
9bbb0fa1 BK |
2157 | const unsigned char *old_sha1, |
2158 | int flags, int *type_p) | |
4bd18c43 | 2159 | { |
dfefa935 | 2160 | if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) |
257f3020 | 2161 | return NULL; |
9bbb0fa1 | 2162 | return lock_ref_sha1_basic(refname, old_sha1, flags, type_p); |
c0277d15 JH |
2163 | } |
2164 | ||
fec3137f MH |
2165 | /* |
2166 | * Write an entry to the packed-refs file for the specified refname. | |
2167 | * If peeled is non-NULL, write it as the entry's peeled value. | |
2168 | */ | |
2169 | static void write_packed_entry(int fd, char *refname, unsigned char *sha1, | |
2170 | unsigned char *peeled) | |
d66da478 | 2171 | { |
d66da478 MH |
2172 | char line[PATH_MAX + 100]; |
2173 | int len; | |
2174 | ||
d66da478 MH |
2175 | len = snprintf(line, sizeof(line), "%s %s\n", |
2176 | sha1_to_hex(sha1), refname); | |
2177 | /* this should not happen but just being defensive */ | |
2178 | if (len > sizeof(line)) | |
2179 | die("too long a refname '%s'", refname); | |
fec3137f MH |
2180 | write_or_die(fd, line, len); |
2181 | ||
2182 | if (peeled) { | |
2183 | if (snprintf(line, sizeof(line), "^%s\n", | |
2184 | sha1_to_hex(peeled)) != PEELED_LINE_LENGTH) | |
2185 | die("internal error"); | |
2186 | write_or_die(fd, line, PEELED_LINE_LENGTH); | |
2187 | } | |
2188 | } | |
2189 | ||
7b40d396 MH |
2190 | /* |
2191 | * An each_ref_entry_fn that writes the entry to a packed-refs file. | |
2192 | */ | |
2193 | static int write_packed_entry_fn(struct ref_entry *entry, void *cb_data) | |
2194 | { | |
2195 | int *fd = cb_data; | |
2196 | enum peel_status peel_status = peel_entry(entry, 0); | |
2197 | ||
2198 | if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG) | |
2199 | error("internal error: %s is not a valid packed reference!", | |
2200 | entry->name); | |
2201 | write_packed_entry(*fd, entry->name, entry->u.value.sha1, | |
2202 | peel_status == PEEL_PEELED ? | |
2203 | entry->u.value.peeled : NULL); | |
2204 | return 0; | |
2205 | } | |
2206 | ||
9f69d297 MH |
2207 | int lock_packed_refs(int flags) |
2208 | { | |
2209 | struct packed_ref_cache *packed_ref_cache; | |
2210 | ||
9f69d297 MH |
2211 | if (hold_lock_file_for_update(&packlock, git_path("packed-refs"), flags) < 0) |
2212 | return -1; | |
5d478f5c MH |
2213 | /* |
2214 | * Get the current packed-refs while holding the lock. If the | |
2215 | * packed-refs file has been modified since we last read it, | |
2216 | * this will automatically invalidate the cache and re-read | |
2217 | * the packed-refs file. | |
2218 | */ | |
9f69d297 MH |
2219 | packed_ref_cache = get_packed_ref_cache(&ref_cache); |
2220 | packed_ref_cache->lock = &packlock; | |
4f6b83e3 MH |
2221 | /* Increment the reference count to prevent it from being freed: */ |
2222 | acquire_packed_ref_cache(packed_ref_cache); | |
9f69d297 MH |
2223 | return 0; |
2224 | } | |
2225 | ||
2226 | int commit_packed_refs(void) | |
2227 | { | |
2228 | struct packed_ref_cache *packed_ref_cache = | |
2229 | get_packed_ref_cache(&ref_cache); | |
2230 | int error = 0; | |
2231 | ||
2232 | if (!packed_ref_cache->lock) | |
2233 | die("internal error: packed-refs not locked"); | |
2234 | write_or_die(packed_ref_cache->lock->fd, | |
2235 | PACKED_REFS_HEADER, strlen(PACKED_REFS_HEADER)); | |
2236 | ||
2237 | do_for_each_entry_in_dir(get_packed_ref_dir(packed_ref_cache), | |
2238 | 0, write_packed_entry_fn, | |
2239 | &packed_ref_cache->lock->fd); | |
2240 | if (commit_lock_file(packed_ref_cache->lock)) | |
2241 | error = -1; | |
2242 | packed_ref_cache->lock = NULL; | |
4f6b83e3 | 2243 | release_packed_ref_cache(packed_ref_cache); |
9f69d297 MH |
2244 | return error; |
2245 | } | |
2246 | ||
2247 | void rollback_packed_refs(void) | |
2248 | { | |
2249 | struct packed_ref_cache *packed_ref_cache = | |
2250 | get_packed_ref_cache(&ref_cache); | |
2251 | ||
2252 | if (!packed_ref_cache->lock) | |
2253 | die("internal error: packed-refs not locked"); | |
2254 | rollback_lock_file(packed_ref_cache->lock); | |
2255 | packed_ref_cache->lock = NULL; | |
4f6b83e3 | 2256 | release_packed_ref_cache(packed_ref_cache); |
9f69d297 MH |
2257 | clear_packed_ref_cache(&ref_cache); |
2258 | } | |
2259 | ||
32d462ce MH |
2260 | struct ref_to_prune { |
2261 | struct ref_to_prune *next; | |
2262 | unsigned char sha1[20]; | |
2263 | char name[FLEX_ARRAY]; | |
2264 | }; | |
2265 | ||
2266 | struct pack_refs_cb_data { | |
2267 | unsigned int flags; | |
267f9a8c | 2268 | struct ref_dir *packed_refs; |
32d462ce | 2269 | struct ref_to_prune *ref_to_prune; |
32d462ce MH |
2270 | }; |
2271 | ||
267f9a8c MH |
2272 | /* |
2273 | * An each_ref_entry_fn that is run over loose references only. If | |
2274 | * the loose reference can be packed, add an entry in the packed ref | |
2275 | * cache. If the reference should be pruned, also add it to | |
2276 | * ref_to_prune in the pack_refs_cb_data. | |
2277 | */ | |
2278 | static int pack_if_possible_fn(struct ref_entry *entry, void *cb_data) | |
32d462ce MH |
2279 | { |
2280 | struct pack_refs_cb_data *cb = cb_data; | |
f85354b5 | 2281 | enum peel_status peel_status; |
267f9a8c | 2282 | struct ref_entry *packed_entry; |
59556548 | 2283 | int is_tag_ref = starts_with(entry->name, "refs/tags/"); |
32d462ce | 2284 | |
267f9a8c MH |
2285 | /* ALWAYS pack tags */ |
2286 | if (!(cb->flags & PACK_REFS_ALL) && !is_tag_ref) | |
32d462ce MH |
2287 | return 0; |
2288 | ||
b2a8226d MH |
2289 | /* Do not pack symbolic or broken refs: */ |
2290 | if ((entry->flag & REF_ISSYMREF) || !ref_resolves_to_object(entry)) | |
2291 | return 0; | |
2292 | ||
267f9a8c | 2293 | /* Add a packed ref cache entry equivalent to the loose entry. */ |
f85354b5 | 2294 | peel_status = peel_entry(entry, 1); |
0f29920f | 2295 | if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG) |
f85354b5 MH |
2296 | die("internal error peeling reference %s (%s)", |
2297 | entry->name, sha1_to_hex(entry->u.value.sha1)); | |
267f9a8c MH |
2298 | packed_entry = find_ref(cb->packed_refs, entry->name); |
2299 | if (packed_entry) { | |
2300 | /* Overwrite existing packed entry with info from loose entry */ | |
2301 | packed_entry->flag = REF_ISPACKED | REF_KNOWS_PEELED; | |
2302 | hashcpy(packed_entry->u.value.sha1, entry->u.value.sha1); | |
2303 | } else { | |
2304 | packed_entry = create_ref_entry(entry->name, entry->u.value.sha1, | |
2305 | REF_ISPACKED | REF_KNOWS_PEELED, 0); | |
2306 | add_ref(cb->packed_refs, packed_entry); | |
2307 | } | |
2308 | hashcpy(packed_entry->u.value.peeled, entry->u.value.peeled); | |
32d462ce | 2309 | |
267f9a8c MH |
2310 | /* Schedule the loose reference for pruning if requested. */ |
2311 | if ((cb->flags & PACK_REFS_PRUNE)) { | |
12e77559 | 2312 | int namelen = strlen(entry->name) + 1; |
32d462ce | 2313 | struct ref_to_prune *n = xcalloc(1, sizeof(*n) + namelen); |
12e77559 MH |
2314 | hashcpy(n->sha1, entry->u.value.sha1); |
2315 | strcpy(n->name, entry->name); | |
32d462ce MH |
2316 | n->next = cb->ref_to_prune; |
2317 | cb->ref_to_prune = n; | |
2318 | } | |
d66da478 MH |
2319 | return 0; |
2320 | } | |
2321 | ||
32d462ce MH |
2322 | /* |
2323 | * Remove empty parents, but spare refs/ and immediate subdirs. | |
2324 | * Note: munges *name. | |
2325 | */ | |
2326 | static void try_remove_empty_parents(char *name) | |
2327 | { | |
2328 | char *p, *q; | |
2329 | int i; | |
2330 | p = name; | |
2331 | for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */ | |
2332 | while (*p && *p != '/') | |
2333 | p++; | |
2334 | /* tolerate duplicate slashes; see check_refname_format() */ | |
2335 | while (*p == '/') | |
2336 | p++; | |
2337 | } | |
2338 | for (q = p; *q; q++) | |
2339 | ; | |
2340 | while (1) { | |
2341 | while (q > p && *q != '/') | |
2342 | q--; | |
2343 | while (q > p && *(q-1) == '/') | |
2344 | q--; | |
2345 | if (q == p) | |
2346 | break; | |
2347 | *q = '\0'; | |
2348 | if (rmdir(git_path("%s", name))) | |
2349 | break; | |
2350 | } | |
2351 | } | |
2352 | ||
2353 | /* make sure nobody touched the ref, and unlink */ | |
2354 | static void prune_ref(struct ref_to_prune *r) | |
2355 | { | |
2356 | struct ref_lock *lock = lock_ref_sha1(r->name + 5, r->sha1); | |
2357 | ||
2358 | if (lock) { | |
2359 | unlink_or_warn(git_path("%s", r->name)); | |
2360 | unlock_ref(lock); | |
2361 | try_remove_empty_parents(r->name); | |
2362 | } | |
2363 | } | |
2364 | ||
2365 | static void prune_refs(struct ref_to_prune *r) | |
2366 | { | |
2367 | while (r) { | |
2368 | prune_ref(r); | |
2369 | r = r->next; | |
2370 | } | |
2371 | } | |
2372 | ||
32d462ce MH |
2373 | int pack_refs(unsigned int flags) |
2374 | { | |
32d462ce MH |
2375 | struct pack_refs_cb_data cbdata; |
2376 | ||
2377 | memset(&cbdata, 0, sizeof(cbdata)); | |
2378 | cbdata.flags = flags; | |
2379 | ||
9f69d297 | 2380 | lock_packed_refs(LOCK_DIE_ON_ERROR); |
267f9a8c | 2381 | cbdata.packed_refs = get_packed_refs(&ref_cache); |
32d462ce | 2382 | |
267f9a8c MH |
2383 | do_for_each_entry_in_dir(get_loose_refs(&ref_cache), 0, |
2384 | pack_if_possible_fn, &cbdata); | |
32d462ce | 2385 | |
9f69d297 | 2386 | if (commit_packed_refs()) |
32d462ce | 2387 | die_errno("unable to overwrite old ref-pack file"); |
9f69d297 | 2388 | |
32d462ce MH |
2389 | prune_refs(cbdata.ref_to_prune); |
2390 | return 0; | |
2391 | } | |
2392 | ||
7b40d396 MH |
2393 | /* |
2394 | * If entry is no longer needed in packed-refs, add it to the string | |
2395 | * list pointed to by cb_data. Reasons for deleting entries: | |
2396 | * | |
2397 | * - Entry is broken. | |
2398 | * - Entry is overridden by a loose ref. | |
2399 | * - Entry does not point at a valid object. | |
2400 | * | |
2401 | * In the first and third cases, also emit an error message because these | |
2402 | * are indications of repository corruption. | |
2403 | */ | |
2404 | static int curate_packed_ref_fn(struct ref_entry *entry, void *cb_data) | |
c0277d15 | 2405 | { |
7b40d396 | 2406 | struct string_list *refs_to_delete = cb_data; |
fec3137f | 2407 | |
ab292bc4 MH |
2408 | if (entry->flag & REF_ISBROKEN) { |
2409 | /* This shouldn't happen to packed refs. */ | |
2410 | error("%s is broken!", entry->name); | |
7b40d396 | 2411 | string_list_append(refs_to_delete, entry->name); |
c0277d15 | 2412 | return 0; |
ab292bc4 MH |
2413 | } |
2414 | if (!has_sha1_file(entry->u.value.sha1)) { | |
2415 | unsigned char sha1[20]; | |
2416 | int flags; | |
2417 | ||
2418 | if (read_ref_full(entry->name, sha1, 0, &flags)) | |
2419 | /* We should at least have found the packed ref. */ | |
2420 | die("Internal error"); | |
7b40d396 | 2421 | if ((flags & REF_ISSYMREF) || !(flags & REF_ISPACKED)) { |
ab292bc4 MH |
2422 | /* |
2423 | * This packed reference is overridden by a | |
2424 | * loose reference, so it is OK that its value | |
2425 | * is no longer valid; for example, it might | |
2426 | * refer to an object that has been garbage | |
2427 | * collected. For this purpose we don't even | |
2428 | * care whether the loose reference itself is | |
2429 | * invalid, broken, symbolic, etc. Silently | |
7b40d396 | 2430 | * remove the packed reference. |
ab292bc4 | 2431 | */ |
7b40d396 | 2432 | string_list_append(refs_to_delete, entry->name); |
ab292bc4 | 2433 | return 0; |
7b40d396 | 2434 | } |
ab292bc4 MH |
2435 | /* |
2436 | * There is no overriding loose reference, so the fact | |
2437 | * that this reference doesn't refer to a valid object | |
2438 | * indicates some kind of repository corruption. | |
2439 | * Report the problem, then omit the reference from | |
2440 | * the output. | |
2441 | */ | |
2442 | error("%s does not point to a valid object!", entry->name); | |
7b40d396 | 2443 | string_list_append(refs_to_delete, entry->name); |
ab292bc4 MH |
2444 | return 0; |
2445 | } | |
2446 | ||
d66da478 MH |
2447 | return 0; |
2448 | } | |
2449 | ||
c9e768bb | 2450 | int repack_without_refs(const char **refnames, int n) |
c0277d15 | 2451 | { |
7618fd80 | 2452 | struct ref_dir *packed; |
7b40d396 MH |
2453 | struct string_list refs_to_delete = STRING_LIST_INIT_DUP; |
2454 | struct string_list_item *ref_to_delete; | |
61cee0db BK |
2455 | int i, removed = 0; |
2456 | ||
2457 | /* Look for a packed ref */ | |
2458 | for (i = 0; i < n; i++) | |
2459 | if (get_packed_ref(refnames[i])) | |
2460 | break; | |
7618fd80 | 2461 | |
61cee0db BK |
2462 | /* Avoid locking if we have nothing to do */ |
2463 | if (i == n) | |
2464 | return 0; /* no refname exists in packed refs */ | |
7618fd80 | 2465 | |
9f69d297 | 2466 | if (lock_packed_refs(0)) { |
1b018fd9 | 2467 | unable_to_lock_error(git_path("packed-refs"), errno); |
61cee0db | 2468 | return error("cannot delete '%s' from packed refs", refnames[i]); |
1b018fd9 | 2469 | } |
9da31cb0 | 2470 | packed = get_packed_refs(&ref_cache); |
7b40d396 | 2471 | |
61cee0db BK |
2472 | /* Remove refnames from the cache */ |
2473 | for (i = 0; i < n; i++) | |
2474 | if (remove_entry(packed, refnames[i]) != -1) | |
2475 | removed = 1; | |
2476 | if (!removed) { | |
506a760d | 2477 | /* |
61cee0db | 2478 | * All packed entries disappeared while we were |
506a760d MH |
2479 | * acquiring the lock. |
2480 | */ | |
9f69d297 | 2481 | rollback_packed_refs(); |
506a760d MH |
2482 | return 0; |
2483 | } | |
7b40d396 | 2484 | |
61cee0db | 2485 | /* Remove any other accumulated cruft */ |
7b40d396 MH |
2486 | do_for_each_entry_in_dir(packed, 0, curate_packed_ref_fn, &refs_to_delete); |
2487 | for_each_string_list_item(ref_to_delete, &refs_to_delete) { | |
2488 | if (remove_entry(packed, ref_to_delete->string) == -1) | |
2489 | die("internal error"); | |
2490 | } | |
2491 | ||
61cee0db | 2492 | /* Write what remains */ |
9f69d297 | 2493 | return commit_packed_refs(); |
c0277d15 JH |
2494 | } |
2495 | ||
61cee0db | 2496 | static int repack_without_ref(const char *refname) |
c0277d15 | 2497 | { |
61cee0db BK |
2498 | return repack_without_refs(&refname, 1); |
2499 | } | |
c0277d15 | 2500 | |
2ddb5d17 BK |
2501 | static int delete_ref_loose(struct ref_lock *lock, int flag) |
2502 | { | |
045a476f | 2503 | if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) { |
c0277d15 | 2504 | /* loose */ |
2ddb5d17 BK |
2505 | int err, i = strlen(lock->lk->filename) - 5; /* .lock */ |
2506 | ||
547d058f RS |
2507 | lock->lk->filename[i] = 0; |
2508 | err = unlink_or_warn(lock->lk->filename); | |
547d058f | 2509 | lock->lk->filename[i] = '.'; |
2ddb5d17 BK |
2510 | if (err && errno != ENOENT) |
2511 | return 1; | |
c0277d15 | 2512 | } |
2ddb5d17 BK |
2513 | return 0; |
2514 | } | |
2515 | ||
eca35a25 | 2516 | int delete_ref(const char *refname, const unsigned char *sha1, int delopt) |
c0277d15 JH |
2517 | { |
2518 | struct ref_lock *lock; | |
2ddb5d17 | 2519 | int ret = 0, flag = 0; |
c0277d15 | 2520 | |
547d058f | 2521 | lock = lock_ref_sha1_basic(refname, sha1, delopt, &flag); |
c0277d15 JH |
2522 | if (!lock) |
2523 | return 1; | |
2ddb5d17 | 2524 | ret |= delete_ref_loose(lock, flag); |
691f1a28 | 2525 | |
c0277d15 JH |
2526 | /* removing the loose one could have resurrected an earlier |
2527 | * packed one. Also, if it was not loose we need to repack | |
2528 | * without it. | |
2529 | */ | |
b274a714 | 2530 | ret |= repack_without_ref(lock->ref_name); |
c0277d15 | 2531 | |
691f1a28 | 2532 | unlink_or_warn(git_path("logs/%s", lock->ref_name)); |
9da31cb0 | 2533 | clear_loose_ref_cache(&ref_cache); |
c0277d15 JH |
2534 | unlock_ref(lock); |
2535 | return ret; | |
4bd18c43 SP |
2536 | } |
2537 | ||
765c2258 PH |
2538 | /* |
2539 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
2540 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
2541 | * | |
2542 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
2543 | * live into logs/refs. | |
2544 | */ | |
2545 | #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log" | |
2546 | ||
fa59ae79 MH |
2547 | static int rename_tmp_log(const char *newrefname) |
2548 | { | |
f1e9e9a4 | 2549 | int attempts_remaining = 4; |
ae4a283e MH |
2550 | |
2551 | retry: | |
08f555cb MH |
2552 | switch (safe_create_leading_directories(git_path("logs/%s", newrefname))) { |
2553 | case SCLD_OK: | |
2554 | break; /* success */ | |
2555 | case SCLD_VANISHED: | |
2556 | if (--attempts_remaining > 0) | |
2557 | goto retry; | |
2558 | /* fall through */ | |
2559 | default: | |
fa59ae79 MH |
2560 | error("unable to create directory for %s", newrefname); |
2561 | return -1; | |
2562 | } | |
2563 | ||
fa59ae79 | 2564 | if (rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname))) { |
f1e9e9a4 | 2565 | if ((errno==EISDIR || errno==ENOTDIR) && --attempts_remaining > 0) { |
fa59ae79 MH |
2566 | /* |
2567 | * rename(a, b) when b is an existing | |
2568 | * directory ought to result in ISDIR, but | |
2569 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
2570 | */ | |
2571 | if (remove_empty_directories(git_path("logs/%s", newrefname))) { | |
2572 | error("Directory not empty: logs/%s", newrefname); | |
2573 | return -1; | |
2574 | } | |
2575 | goto retry; | |
ae4a283e MH |
2576 | } else if (errno == ENOENT && --attempts_remaining > 0) { |
2577 | /* | |
2578 | * Maybe another process just deleted one of | |
2579 | * the directories in the path to newrefname. | |
2580 | * Try again from the beginning. | |
2581 | */ | |
2582 | goto retry; | |
fa59ae79 MH |
2583 | } else { |
2584 | error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s", | |
2585 | newrefname, strerror(errno)); | |
2586 | return -1; | |
2587 | } | |
2588 | } | |
2589 | return 0; | |
2590 | } | |
2591 | ||
dfefa935 | 2592 | int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg) |
c976d415 | 2593 | { |
c976d415 LH |
2594 | unsigned char sha1[20], orig_sha1[20]; |
2595 | int flag = 0, logmoved = 0; | |
2596 | struct ref_lock *lock; | |
c976d415 | 2597 | struct stat loginfo; |
dfefa935 | 2598 | int log = !lstat(git_path("logs/%s", oldrefname), &loginfo); |
eca35a25 | 2599 | const char *symref = NULL; |
c976d415 | 2600 | |
450d4c0f | 2601 | if (log && S_ISLNK(loginfo.st_mode)) |
dfefa935 | 2602 | return error("reflog for %s is a symlink", oldrefname); |
c976d415 | 2603 | |
8d68493f | 2604 | symref = resolve_ref_unsafe(oldrefname, orig_sha1, 1, &flag); |
eca35a25 | 2605 | if (flag & REF_ISSYMREF) |
fa58186c | 2606 | return error("refname %s is a symbolic ref, renaming it is not supported", |
dfefa935 | 2607 | oldrefname); |
eca35a25 | 2608 | if (!symref) |
dfefa935 | 2609 | return error("refname %s not found", oldrefname); |
c976d415 | 2610 | |
9da31cb0 | 2611 | if (!is_refname_available(newrefname, oldrefname, get_packed_refs(&ref_cache))) |
c976d415 LH |
2612 | return 1; |
2613 | ||
9da31cb0 | 2614 | if (!is_refname_available(newrefname, oldrefname, get_loose_refs(&ref_cache))) |
c976d415 LH |
2615 | return 1; |
2616 | ||
dfefa935 | 2617 | if (log && rename(git_path("logs/%s", oldrefname), git_path(TMP_RENAMED_LOG))) |
765c2258 | 2618 | return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s", |
dfefa935 | 2619 | oldrefname, strerror(errno)); |
c976d415 | 2620 | |
dfefa935 MH |
2621 | if (delete_ref(oldrefname, orig_sha1, REF_NODEREF)) { |
2622 | error("unable to delete old %s", oldrefname); | |
c976d415 LH |
2623 | goto rollback; |
2624 | } | |
2625 | ||
dfefa935 MH |
2626 | if (!read_ref_full(newrefname, sha1, 1, &flag) && |
2627 | delete_ref(newrefname, sha1, REF_NODEREF)) { | |
c976d415 | 2628 | if (errno==EISDIR) { |
dfefa935 MH |
2629 | if (remove_empty_directories(git_path("%s", newrefname))) { |
2630 | error("Directory not empty: %s", newrefname); | |
c976d415 LH |
2631 | goto rollback; |
2632 | } | |
2633 | } else { | |
dfefa935 | 2634 | error("unable to delete existing %s", newrefname); |
c976d415 LH |
2635 | goto rollback; |
2636 | } | |
2637 | } | |
2638 | ||
fa59ae79 | 2639 | if (log && rename_tmp_log(newrefname)) |
c976d415 | 2640 | goto rollback; |
c976d415 | 2641 | |
c976d415 LH |
2642 | logmoved = log; |
2643 | ||
dfefa935 | 2644 | lock = lock_ref_sha1_basic(newrefname, NULL, 0, NULL); |
c976d415 | 2645 | if (!lock) { |
dfefa935 | 2646 | error("unable to lock %s for update", newrefname); |
c976d415 LH |
2647 | goto rollback; |
2648 | } | |
c976d415 LH |
2649 | lock->force_write = 1; |
2650 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 2651 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
dfefa935 | 2652 | error("unable to write current sha1 into %s", newrefname); |
c976d415 LH |
2653 | goto rollback; |
2654 | } | |
2655 | ||
2656 | return 0; | |
2657 | ||
2658 | rollback: | |
dfefa935 | 2659 | lock = lock_ref_sha1_basic(oldrefname, NULL, 0, NULL); |
c976d415 | 2660 | if (!lock) { |
dfefa935 | 2661 | error("unable to lock %s for rollback", oldrefname); |
c976d415 LH |
2662 | goto rollbacklog; |
2663 | } | |
2664 | ||
2665 | lock->force_write = 1; | |
2666 | flag = log_all_ref_updates; | |
2667 | log_all_ref_updates = 0; | |
2668 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
dfefa935 | 2669 | error("unable to write current sha1 into %s", oldrefname); |
c976d415 LH |
2670 | log_all_ref_updates = flag; |
2671 | ||
2672 | rollbacklog: | |
dfefa935 | 2673 | if (logmoved && rename(git_path("logs/%s", newrefname), git_path("logs/%s", oldrefname))) |
c976d415 | 2674 | error("unable to restore logfile %s from %s: %s", |
dfefa935 | 2675 | oldrefname, newrefname, strerror(errno)); |
c976d415 | 2676 | if (!logmoved && log && |
dfefa935 | 2677 | rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldrefname))) |
765c2258 | 2678 | error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s", |
dfefa935 | 2679 | oldrefname, strerror(errno)); |
c976d415 LH |
2680 | |
2681 | return 1; | |
2682 | } | |
2683 | ||
435fc852 | 2684 | int close_ref(struct ref_lock *lock) |
b531394d BC |
2685 | { |
2686 | if (close_lock_file(lock->lk)) | |
2687 | return -1; | |
2688 | lock->lock_fd = -1; | |
2689 | return 0; | |
2690 | } | |
2691 | ||
435fc852 | 2692 | int commit_ref(struct ref_lock *lock) |
b531394d BC |
2693 | { |
2694 | if (commit_lock_file(lock->lk)) | |
2695 | return -1; | |
2696 | lock->lock_fd = -1; | |
2697 | return 0; | |
2698 | } | |
2699 | ||
e5f38ec3 | 2700 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 | 2701 | { |
4ed7cd3a BC |
2702 | /* Do not free lock->lk -- atexit() still looks at them */ |
2703 | if (lock->lk) | |
2704 | rollback_lock_file(lock->lk); | |
434cd0cd | 2705 | free(lock->ref_name); |
1655707c | 2706 | free(lock->orig_ref_name); |
4bd18c43 SP |
2707 | free(lock); |
2708 | } | |
2709 | ||
0ec29a47 JH |
2710 | /* |
2711 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
2712 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
2713 | * because reflog file is one line per entry. | |
2714 | */ | |
2715 | static int copy_msg(char *buf, const char *msg) | |
2716 | { | |
2717 | char *cp = buf; | |
2718 | char c; | |
2719 | int wasspace = 1; | |
2720 | ||
2721 | *cp++ = '\t'; | |
2722 | while ((c = *msg++)) { | |
2723 | if (wasspace && isspace(c)) | |
2724 | continue; | |
2725 | wasspace = isspace(c); | |
2726 | if (wasspace) | |
2727 | c = ' '; | |
2728 | *cp++ = c; | |
2729 | } | |
2730 | while (buf < cp && isspace(cp[-1])) | |
2731 | cp--; | |
2732 | *cp++ = '\n'; | |
2733 | return cp - buf; | |
2734 | } | |
2735 | ||
dfefa935 | 2736 | int log_ref_setup(const char *refname, char *logfile, int bufsize) |
6de08ae6 | 2737 | { |
859c3017 | 2738 | int logfd, oflags = O_APPEND | O_WRONLY; |
9a13f0b7 | 2739 | |
dfefa935 | 2740 | git_snpath(logfile, bufsize, "logs/%s", refname); |
4057deb5 | 2741 | if (log_all_ref_updates && |
59556548 CC |
2742 | (starts_with(refname, "refs/heads/") || |
2743 | starts_with(refname, "refs/remotes/") || | |
2744 | starts_with(refname, "refs/notes/") || | |
dfefa935 | 2745 | !strcmp(refname, "HEAD"))) { |
157aaea5 | 2746 | if (safe_create_leading_directories(logfile) < 0) |
6de08ae6 | 2747 | return error("unable to create directory for %s", |
157aaea5 | 2748 | logfile); |
6de08ae6 SP |
2749 | oflags |= O_CREAT; |
2750 | } | |
2751 | ||
157aaea5 | 2752 | logfd = open(logfile, oflags, 0666); |
6de08ae6 | 2753 | if (logfd < 0) { |
1974bf62 | 2754 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 2755 | return 0; |
3b463c3f JH |
2756 | |
2757 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
157aaea5 | 2758 | if (remove_empty_directories(logfile)) { |
3b463c3f | 2759 | return error("There are still logs under '%s'", |
157aaea5 | 2760 | logfile); |
3b463c3f | 2761 | } |
157aaea5 | 2762 | logfd = open(logfile, oflags, 0666); |
3b463c3f JH |
2763 | } |
2764 | ||
2765 | if (logfd < 0) | |
2766 | return error("Unable to append to %s: %s", | |
157aaea5 | 2767 | logfile, strerror(errno)); |
6de08ae6 SP |
2768 | } |
2769 | ||
157aaea5 | 2770 | adjust_shared_perm(logfile); |
859c3017 EM |
2771 | close(logfd); |
2772 | return 0; | |
2773 | } | |
443b92b6 | 2774 | |
dfefa935 | 2775 | static int log_ref_write(const char *refname, const unsigned char *old_sha1, |
859c3017 EM |
2776 | const unsigned char *new_sha1, const char *msg) |
2777 | { | |
2778 | int logfd, result, written, oflags = O_APPEND | O_WRONLY; | |
2779 | unsigned maxlen, len; | |
2780 | int msglen; | |
157aaea5 | 2781 | char log_file[PATH_MAX]; |
859c3017 EM |
2782 | char *logrec; |
2783 | const char *committer; | |
2784 | ||
2785 | if (log_all_ref_updates < 0) | |
2786 | log_all_ref_updates = !is_bare_repository(); | |
2787 | ||
dfefa935 | 2788 | result = log_ref_setup(refname, log_file, sizeof(log_file)); |
859c3017 EM |
2789 | if (result) |
2790 | return result; | |
2791 | ||
2792 | logfd = open(log_file, oflags); | |
2793 | if (logfd < 0) | |
2794 | return 0; | |
0ec29a47 | 2795 | msglen = msg ? strlen(msg) : 0; |
774751a8 | 2796 | committer = git_committer_info(0); |
8ac65937 JH |
2797 | maxlen = strlen(committer) + msglen + 100; |
2798 | logrec = xmalloc(maxlen); | |
2799 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
2800 | sha1_to_hex(old_sha1), |
2801 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
2802 | committer); |
2803 | if (msglen) | |
0ec29a47 | 2804 | len += copy_msg(logrec + len - 1, msg) - 1; |
93822c22 | 2805 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 | 2806 | free(logrec); |
91c8d590 | 2807 | if (close(logfd) != 0 || written != len) |
9a13f0b7 | 2808 | return error("Unable to append to %s", log_file); |
6de08ae6 SP |
2809 | return 0; |
2810 | } | |
2811 | ||
c3b0dec5 LT |
2812 | static int is_branch(const char *refname) |
2813 | { | |
59556548 | 2814 | return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/"); |
c3b0dec5 LT |
2815 | } |
2816 | ||
4bd18c43 SP |
2817 | int write_ref_sha1(struct ref_lock *lock, |
2818 | const unsigned char *sha1, const char *logmsg) | |
2819 | { | |
2820 | static char term = '\n'; | |
c3b0dec5 | 2821 | struct object *o; |
4bd18c43 SP |
2822 | |
2823 | if (!lock) | |
95fc7512 | 2824 | return -1; |
a89fccd2 | 2825 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
2826 | unlock_ref(lock); |
2827 | return 0; | |
95fc7512 | 2828 | } |
c3b0dec5 LT |
2829 | o = parse_object(sha1); |
2830 | if (!o) { | |
7be8b3ba | 2831 | error("Trying to write ref %s with nonexistent object %s", |
c3b0dec5 LT |
2832 | lock->ref_name, sha1_to_hex(sha1)); |
2833 | unlock_ref(lock); | |
2834 | return -1; | |
2835 | } | |
2836 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
2837 | error("Trying to write non-commit object %s to branch %s", | |
2838 | sha1_to_hex(sha1), lock->ref_name); | |
2839 | unlock_ref(lock); | |
2840 | return -1; | |
2841 | } | |
93822c22 AW |
2842 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
2843 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
b531394d | 2844 | || close_ref(lock) < 0) { |
c33d5174 | 2845 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
2846 | unlock_ref(lock); |
2847 | return -1; | |
2848 | } | |
9da31cb0 | 2849 | clear_loose_ref_cache(&ref_cache); |
bd104db1 NP |
2850 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
2851 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
2852 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
2853 | unlock_ref(lock); |
2854 | return -1; | |
2855 | } | |
605fac8b NP |
2856 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
2857 | /* | |
2858 | * Special hack: If a branch is updated directly and HEAD | |
2859 | * points to it (may happen on the remote side of a push | |
2860 | * for example) then logically the HEAD reflog should be | |
2861 | * updated too. | |
2862 | * A generic solution implies reverse symref information, | |
2863 | * but finding all symrefs pointing to the given branch | |
2864 | * would be rather costly for this rare event (the direct | |
2865 | * update of a branch) to be worth it. So let's cheat and | |
2866 | * check with HEAD only which should cover 99% of all usage | |
2867 | * scenarios (even 100% of the default ones). | |
2868 | */ | |
2869 | unsigned char head_sha1[20]; | |
2870 | int head_flag; | |
2871 | const char *head_ref; | |
8cad4744 | 2872 | head_ref = resolve_ref_unsafe("HEAD", head_sha1, 1, &head_flag); |
605fac8b NP |
2873 | if (head_ref && (head_flag & REF_ISSYMREF) && |
2874 | !strcmp(head_ref, lock->ref_name)) | |
2875 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
2876 | } | |
b531394d | 2877 | if (commit_ref(lock)) { |
434cd0cd | 2878 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
2879 | unlock_ref(lock); |
2880 | return -1; | |
2881 | } | |
4bd18c43 SP |
2882 | unlock_ref(lock); |
2883 | return 0; | |
95fc7512 | 2884 | } |
d556fae2 | 2885 | |
8b5157e4 NP |
2886 | int create_symref(const char *ref_target, const char *refs_heads_master, |
2887 | const char *logmsg) | |
41b625b0 NP |
2888 | { |
2889 | const char *lockpath; | |
2890 | char ref[1000]; | |
2891 | int fd, len, written; | |
a4f34cbb | 2892 | char *git_HEAD = git_pathdup("%s", ref_target); |
8b5157e4 NP |
2893 | unsigned char old_sha1[20], new_sha1[20]; |
2894 | ||
2895 | if (logmsg && read_ref(ref_target, old_sha1)) | |
2896 | hashclr(old_sha1); | |
41b625b0 | 2897 | |
d48744d1 JH |
2898 | if (safe_create_leading_directories(git_HEAD) < 0) |
2899 | return error("unable to create directory for %s", git_HEAD); | |
2900 | ||
41b625b0 NP |
2901 | #ifndef NO_SYMLINK_HEAD |
2902 | if (prefer_symlink_refs) { | |
2903 | unlink(git_HEAD); | |
2904 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 2905 | goto done; |
41b625b0 NP |
2906 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
2907 | } | |
2908 | #endif | |
2909 | ||
2910 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
2911 | if (sizeof(ref) <= len) { | |
2912 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 2913 | goto error_free_return; |
41b625b0 NP |
2914 | } |
2915 | lockpath = mkpath("%s.lock", git_HEAD); | |
2916 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
2917 | if (fd < 0) { | |
2918 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 2919 | goto error_free_return; |
41b625b0 NP |
2920 | } |
2921 | written = write_in_full(fd, ref, len); | |
91c8d590 | 2922 | if (close(fd) != 0 || written != len) { |
41b625b0 | 2923 | error("Unable to write to %s", lockpath); |
47fc52e2 | 2924 | goto error_unlink_return; |
41b625b0 NP |
2925 | } |
2926 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 2927 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 2928 | goto error_unlink_return; |
41b625b0 NP |
2929 | } |
2930 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 2931 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 | 2932 | error_unlink_return: |
691f1a28 | 2933 | unlink_or_warn(lockpath); |
47fc52e2 JH |
2934 | error_free_return: |
2935 | free(git_HEAD); | |
2936 | return -1; | |
41b625b0 | 2937 | } |
8b5157e4 | 2938 | |
ee96d11b | 2939 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 2940 | done: |
ee96d11b | 2941 | #endif |
8b5157e4 NP |
2942 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
2943 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
2944 | ||
47fc52e2 | 2945 | free(git_HEAD); |
41b625b0 NP |
2946 | return 0; |
2947 | } | |
2948 | ||
16d7cc90 JH |
2949 | static char *ref_msg(const char *line, const char *endp) |
2950 | { | |
2951 | const char *ep; | |
16d7cc90 | 2952 | line += 82; |
182af834 PH |
2953 | ep = memchr(line, '\n', endp - line); |
2954 | if (!ep) | |
2955 | ep = endp; | |
2956 | return xmemdupz(line, ep - line); | |
16d7cc90 JH |
2957 | } |
2958 | ||
dfefa935 MH |
2959 | int read_ref_at(const char *refname, unsigned long at_time, int cnt, |
2960 | unsigned char *sha1, char **msg, | |
2961 | unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt) | |
d556fae2 | 2962 | { |
e5229042 | 2963 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 | 2964 | char *tz_c; |
e29cb53a | 2965 | int logfd, tz, reccnt = 0; |
d556fae2 SP |
2966 | struct stat st; |
2967 | unsigned long date; | |
e5229042 | 2968 | unsigned char logged_sha1[20]; |
cb48cb58 | 2969 | void *log_mapped; |
dc49cd76 | 2970 | size_t mapsz; |
d556fae2 | 2971 | |
dfefa935 | 2972 | logfile = git_path("logs/%s", refname); |
d556fae2 SP |
2973 | logfd = open(logfile, O_RDONLY, 0); |
2974 | if (logfd < 0) | |
d824cbba | 2975 | die_errno("Unable to read log '%s'", logfile); |
d556fae2 SP |
2976 | fstat(logfd, &st); |
2977 | if (!st.st_size) | |
2978 | die("Log %s is empty.", logfile); | |
dc49cd76 SP |
2979 | mapsz = xsize_t(st.st_size); |
2980 | log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0); | |
cb48cb58 | 2981 | logdata = log_mapped; |
d556fae2 SP |
2982 | close(logfd); |
2983 | ||
e5229042 | 2984 | lastrec = NULL; |
d556fae2 SP |
2985 | rec = logend = logdata + st.st_size; |
2986 | while (logdata < rec) { | |
e29cb53a | 2987 | reccnt++; |
d556fae2 SP |
2988 | if (logdata < rec && *(rec-1) == '\n') |
2989 | rec--; | |
e5229042 SP |
2990 | lastgt = NULL; |
2991 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 2992 | rec--; |
e5229042 SP |
2993 | if (*rec == '>') |
2994 | lastgt = rec; | |
2995 | } | |
2996 | if (!lastgt) | |
d556fae2 | 2997 | die("Log %s is corrupt.", logfile); |
e5229042 | 2998 | date = strtoul(lastgt + 1, &tz_c, 10); |
ab2a1a32 | 2999 | if (date <= at_time || cnt == 0) { |
76a44c5c | 3000 | tz = strtoul(tz_c, NULL, 10); |
16d7cc90 JH |
3001 | if (msg) |
3002 | *msg = ref_msg(rec, logend); | |
3003 | if (cutoff_time) | |
3004 | *cutoff_time = date; | |
3005 | if (cutoff_tz) | |
3006 | *cutoff_tz = tz; | |
3007 | if (cutoff_cnt) | |
76a44c5c | 3008 | *cutoff_cnt = reccnt - 1; |
e5229042 SP |
3009 | if (lastrec) { |
3010 | if (get_sha1_hex(lastrec, logged_sha1)) | |
3011 | die("Log %s is corrupt.", logfile); | |
3012 | if (get_sha1_hex(rec + 41, sha1)) | |
3013 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 3014 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 3015 | warning("Log %s has gap after %s.", |
73013afd | 3016 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 | 3017 | } |
e5f38ec3 JH |
3018 | } |
3019 | else if (date == at_time) { | |
e5229042 SP |
3020 | if (get_sha1_hex(rec + 41, sha1)) |
3021 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
3022 | } |
3023 | else { | |
e5229042 SP |
3024 | if (get_sha1_hex(rec + 41, logged_sha1)) |
3025 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 3026 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 3027 | warning("Log %s unexpectedly ended on %s.", |
73013afd | 3028 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 SP |
3029 | } |
3030 | } | |
dc49cd76 | 3031 | munmap(log_mapped, mapsz); |
d556fae2 SP |
3032 | return 0; |
3033 | } | |
e5229042 | 3034 | lastrec = rec; |
ab2a1a32 JH |
3035 | if (cnt > 0) |
3036 | cnt--; | |
d556fae2 SP |
3037 | } |
3038 | ||
e5229042 SP |
3039 | rec = logdata; |
3040 | while (rec < logend && *rec != '>' && *rec != '\n') | |
3041 | rec++; | |
3042 | if (rec == logend || *rec == '\n') | |
d556fae2 | 3043 | die("Log %s is corrupt.", logfile); |
e5229042 | 3044 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
3045 | tz = strtoul(tz_c, NULL, 10); |
3046 | if (get_sha1_hex(logdata, sha1)) | |
3047 | die("Log %s is corrupt.", logfile); | |
d1a4489a JK |
3048 | if (is_null_sha1(sha1)) { |
3049 | if (get_sha1_hex(logdata + 41, sha1)) | |
3050 | die("Log %s is corrupt.", logfile); | |
3051 | } | |
16d7cc90 JH |
3052 | if (msg) |
3053 | *msg = ref_msg(logdata, logend); | |
dc49cd76 | 3054 | munmap(log_mapped, mapsz); |
16d7cc90 JH |
3055 | |
3056 | if (cutoff_time) | |
3057 | *cutoff_time = date; | |
3058 | if (cutoff_tz) | |
3059 | *cutoff_tz = tz; | |
3060 | if (cutoff_cnt) | |
3061 | *cutoff_cnt = reccnt; | |
3062 | return 1; | |
d556fae2 | 3063 | } |
2ff81662 | 3064 | |
9a7a183b JH |
3065 | static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data) |
3066 | { | |
3067 | unsigned char osha1[20], nsha1[20]; | |
3068 | char *email_end, *message; | |
3069 | unsigned long timestamp; | |
3070 | int tz; | |
3071 | ||
3072 | /* old SP new SP name <email> SP time TAB msg LF */ | |
3073 | if (sb->len < 83 || sb->buf[sb->len - 1] != '\n' || | |
3074 | get_sha1_hex(sb->buf, osha1) || sb->buf[40] != ' ' || | |
3075 | get_sha1_hex(sb->buf + 41, nsha1) || sb->buf[81] != ' ' || | |
3076 | !(email_end = strchr(sb->buf + 82, '>')) || | |
3077 | email_end[1] != ' ' || | |
3078 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
3079 | !message || message[0] != ' ' || | |
3080 | (message[1] != '+' && message[1] != '-') || | |
3081 | !isdigit(message[2]) || !isdigit(message[3]) || | |
3082 | !isdigit(message[4]) || !isdigit(message[5])) | |
3083 | return 0; /* corrupt? */ | |
3084 | email_end[1] = '\0'; | |
3085 | tz = strtol(message + 1, NULL, 10); | |
3086 | if (message[6] != '\t') | |
3087 | message += 6; | |
3088 | else | |
3089 | message += 7; | |
3090 | return fn(osha1, nsha1, sb->buf + 82, timestamp, tz, message, cb_data); | |
3091 | } | |
3092 | ||
98f85ff4 JH |
3093 | static char *find_beginning_of_line(char *bob, char *scan) |
3094 | { | |
3095 | while (bob < scan && *(--scan) != '\n') | |
3096 | ; /* keep scanning backwards */ | |
3097 | /* | |
3098 | * Return either beginning of the buffer, or LF at the end of | |
3099 | * the previous line. | |
3100 | */ | |
3101 | return scan; | |
3102 | } | |
3103 | ||
3104 | int for_each_reflog_ent_reverse(const char *refname, each_reflog_ent_fn fn, void *cb_data) | |
2ff81662 | 3105 | { |
8ca78803 | 3106 | struct strbuf sb = STRBUF_INIT; |
98f85ff4 JH |
3107 | FILE *logfp; |
3108 | long pos; | |
3109 | int ret = 0, at_tail = 1; | |
2ff81662 | 3110 | |
7ae07c1b | 3111 | logfp = fopen(git_path("logs/%s", refname), "r"); |
2ff81662 | 3112 | if (!logfp) |
883d60fa | 3113 | return -1; |
101d15e0 | 3114 | |
98f85ff4 JH |
3115 | /* Jump to the end */ |
3116 | if (fseek(logfp, 0, SEEK_END) < 0) | |
3117 | return error("cannot seek back reflog for %s: %s", | |
3118 | refname, strerror(errno)); | |
3119 | pos = ftell(logfp); | |
3120 | while (!ret && 0 < pos) { | |
3121 | int cnt; | |
3122 | size_t nread; | |
3123 | char buf[BUFSIZ]; | |
3124 | char *endp, *scanp; | |
3125 | ||
3126 | /* Fill next block from the end */ | |
3127 | cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos; | |
3128 | if (fseek(logfp, pos - cnt, SEEK_SET)) | |
3129 | return error("cannot seek back reflog for %s: %s", | |
3130 | refname, strerror(errno)); | |
3131 | nread = fread(buf, cnt, 1, logfp); | |
e4ca819a | 3132 | if (nread != 1) |
98f85ff4 JH |
3133 | return error("cannot read %d bytes from reflog for %s: %s", |
3134 | cnt, refname, strerror(errno)); | |
3135 | pos -= cnt; | |
3136 | ||
3137 | scanp = endp = buf + cnt; | |
3138 | if (at_tail && scanp[-1] == '\n') | |
3139 | /* Looking at the final LF at the end of the file */ | |
3140 | scanp--; | |
3141 | at_tail = 0; | |
3142 | ||
3143 | while (buf < scanp) { | |
3144 | /* | |
3145 | * terminating LF of the previous line, or the beginning | |
3146 | * of the buffer. | |
3147 | */ | |
3148 | char *bp; | |
3149 | ||
3150 | bp = find_beginning_of_line(buf, scanp); | |
3151 | ||
3152 | if (*bp != '\n') { | |
3153 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
3154 | if (pos) | |
3155 | break; /* need to fill another block */ | |
3156 | scanp = buf - 1; /* leave loop */ | |
3157 | } else { | |
3158 | /* | |
3159 | * (bp + 1) thru endp is the beginning of the | |
3160 | * current line we have in sb | |
3161 | */ | |
3162 | strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1)); | |
3163 | scanp = bp; | |
3164 | endp = bp + 1; | |
3165 | } | |
3166 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
3167 | strbuf_reset(&sb); | |
3168 | if (ret) | |
3169 | break; | |
9d33f7c2 | 3170 | } |
101d15e0 | 3171 | |
2ff81662 | 3172 | } |
98f85ff4 | 3173 | if (!ret && sb.len) |
9a7a183b | 3174 | ret = show_one_reflog_ent(&sb, fn, cb_data); |
98f85ff4 | 3175 | |
2ff81662 | 3176 | fclose(logfp); |
8ca78803 | 3177 | strbuf_release(&sb); |
2266bf27 | 3178 | return ret; |
2ff81662 | 3179 | } |
e29cb53a | 3180 | |
dfefa935 | 3181 | int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data) |
101d15e0 | 3182 | { |
98f85ff4 JH |
3183 | FILE *logfp; |
3184 | struct strbuf sb = STRBUF_INIT; | |
3185 | int ret = 0; | |
3186 | ||
3187 | logfp = fopen(git_path("logs/%s", refname), "r"); | |
3188 | if (!logfp) | |
3189 | return -1; | |
101d15e0 | 3190 | |
98f85ff4 JH |
3191 | while (!ret && !strbuf_getwholeline(&sb, logfp, '\n')) |
3192 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
3193 | fclose(logfp); | |
3194 | strbuf_release(&sb); | |
3195 | return ret; | |
3196 | } | |
989c0e5d MH |
3197 | /* |
3198 | * Call fn for each reflog in the namespace indicated by name. name | |
3199 | * must be empty or end with '/'. Name will be used as a scratch | |
3200 | * space, but its contents will be restored before return. | |
3201 | */ | |
3202 | static int do_for_each_reflog(struct strbuf *name, each_ref_fn fn, void *cb_data) | |
eb8381c8 | 3203 | { |
989c0e5d | 3204 | DIR *d = opendir(git_path("logs/%s", name->buf)); |
fcee5a14 | 3205 | int retval = 0; |
93c603fc | 3206 | struct dirent *de; |
989c0e5d | 3207 | int oldlen = name->len; |
eb8381c8 | 3208 | |
93c603fc | 3209 | if (!d) |
989c0e5d | 3210 | return name->len ? errno : 0; |
eb8381c8 | 3211 | |
93c603fc MH |
3212 | while ((de = readdir(d)) != NULL) { |
3213 | struct stat st; | |
eb8381c8 | 3214 | |
93c603fc MH |
3215 | if (de->d_name[0] == '.') |
3216 | continue; | |
93c603fc MH |
3217 | if (has_extension(de->d_name, ".lock")) |
3218 | continue; | |
989c0e5d MH |
3219 | strbuf_addstr(name, de->d_name); |
3220 | if (stat(git_path("logs/%s", name->buf), &st) < 0) { | |
3221 | ; /* silently ignore */ | |
93c603fc | 3222 | } else { |
eb8381c8 | 3223 | if (S_ISDIR(st.st_mode)) { |
989c0e5d MH |
3224 | strbuf_addch(name, '/'); |
3225 | retval = do_for_each_reflog(name, fn, cb_data); | |
eb8381c8 NP |
3226 | } else { |
3227 | unsigned char sha1[20]; | |
989c0e5d MH |
3228 | if (read_ref_full(name->buf, sha1, 0, NULL)) |
3229 | retval = error("bad ref for %s", name->buf); | |
eb8381c8 | 3230 | else |
989c0e5d | 3231 | retval = fn(name->buf, sha1, 0, cb_data); |
eb8381c8 NP |
3232 | } |
3233 | if (retval) | |
3234 | break; | |
3235 | } | |
989c0e5d | 3236 | strbuf_setlen(name, oldlen); |
eb8381c8 | 3237 | } |
93c603fc | 3238 | closedir(d); |
eb8381c8 NP |
3239 | return retval; |
3240 | } | |
3241 | ||
3242 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
3243 | { | |
989c0e5d MH |
3244 | int retval; |
3245 | struct strbuf name; | |
3246 | strbuf_init(&name, PATH_MAX); | |
3247 | retval = do_for_each_reflog(&name, fn, cb_data); | |
3248 | strbuf_release(&name); | |
3249 | return retval; | |
eb8381c8 | 3250 | } |
3d9f037c | 3251 | |
4738a333 BK |
3252 | static struct ref_lock *update_ref_lock(const char *refname, |
3253 | const unsigned char *oldval, | |
3254 | int flags, int *type_p, | |
3255 | enum action_on_err onerr) | |
3d9f037c | 3256 | { |
4738a333 BK |
3257 | struct ref_lock *lock; |
3258 | lock = lock_any_ref_for_update(refname, oldval, flags, type_p); | |
3d9f037c CR |
3259 | if (!lock) { |
3260 | const char *str = "Cannot lock the ref '%s'."; | |
3261 | switch (onerr) { | |
3262 | case MSG_ON_ERR: error(str, refname); break; | |
3263 | case DIE_ON_ERR: die(str, refname); break; | |
3264 | case QUIET_ON_ERR: break; | |
3265 | } | |
3d9f037c | 3266 | } |
4738a333 BK |
3267 | return lock; |
3268 | } | |
3269 | ||
3270 | static int update_ref_write(const char *action, const char *refname, | |
3271 | const unsigned char *sha1, struct ref_lock *lock, | |
3272 | enum action_on_err onerr) | |
3273 | { | |
3d9f037c CR |
3274 | if (write_ref_sha1(lock, sha1, action) < 0) { |
3275 | const char *str = "Cannot update the ref '%s'."; | |
3276 | switch (onerr) { | |
3277 | case MSG_ON_ERR: error(str, refname); break; | |
3278 | case DIE_ON_ERR: die(str, refname); break; | |
3279 | case QUIET_ON_ERR: break; | |
3280 | } | |
3281 | return 1; | |
3282 | } | |
3283 | return 0; | |
3284 | } | |
cda69f48 | 3285 | |
4738a333 BK |
3286 | int update_ref(const char *action, const char *refname, |
3287 | const unsigned char *sha1, const unsigned char *oldval, | |
3288 | int flags, enum action_on_err onerr) | |
3289 | { | |
3290 | struct ref_lock *lock; | |
ce1e8462 | 3291 | lock = update_ref_lock(refname, oldval, flags, NULL, onerr); |
4738a333 BK |
3292 | if (!lock) |
3293 | return 1; | |
3294 | return update_ref_write(action, refname, sha1, lock, onerr); | |
3295 | } | |
3296 | ||
98aee92d BK |
3297 | static int ref_update_compare(const void *r1, const void *r2) |
3298 | { | |
3299 | const struct ref_update * const *u1 = r1; | |
3300 | const struct ref_update * const *u2 = r2; | |
3301 | return strcmp((*u1)->ref_name, (*u2)->ref_name); | |
3302 | } | |
3303 | ||
3304 | static int ref_update_reject_duplicates(struct ref_update **updates, int n, | |
3305 | enum action_on_err onerr) | |
3306 | { | |
3307 | int i; | |
3308 | for (i = 1; i < n; i++) | |
3309 | if (!strcmp(updates[i - 1]->ref_name, updates[i]->ref_name)) { | |
3310 | const char *str = | |
3311 | "Multiple updates for ref '%s' not allowed."; | |
3312 | switch (onerr) { | |
3313 | case MSG_ON_ERR: | |
3314 | error(str, updates[i]->ref_name); break; | |
3315 | case DIE_ON_ERR: | |
3316 | die(str, updates[i]->ref_name); break; | |
3317 | case QUIET_ON_ERR: | |
3318 | break; | |
3319 | } | |
3320 | return 1; | |
3321 | } | |
3322 | return 0; | |
3323 | } | |
3324 | ||
3325 | int update_refs(const char *action, const struct ref_update **updates_orig, | |
3326 | int n, enum action_on_err onerr) | |
3327 | { | |
3328 | int ret = 0, delnum = 0, i; | |
3329 | struct ref_update **updates; | |
3330 | int *types; | |
3331 | struct ref_lock **locks; | |
3332 | const char **delnames; | |
3333 | ||
3334 | if (!updates_orig || !n) | |
3335 | return 0; | |
3336 | ||
3337 | /* Allocate work space */ | |
3338 | updates = xmalloc(sizeof(*updates) * n); | |
3339 | types = xmalloc(sizeof(*types) * n); | |
3340 | locks = xcalloc(n, sizeof(*locks)); | |
3341 | delnames = xmalloc(sizeof(*delnames) * n); | |
3342 | ||
3343 | /* Copy, sort, and reject duplicate refs */ | |
3344 | memcpy(updates, updates_orig, sizeof(*updates) * n); | |
3345 | qsort(updates, n, sizeof(*updates), ref_update_compare); | |
3346 | ret = ref_update_reject_duplicates(updates, n, onerr); | |
3347 | if (ret) | |
3348 | goto cleanup; | |
3349 | ||
3350 | /* Acquire all locks while verifying old values */ | |
3351 | for (i = 0; i < n; i++) { | |
3352 | locks[i] = update_ref_lock(updates[i]->ref_name, | |
3353 | (updates[i]->have_old ? | |
3354 | updates[i]->old_sha1 : NULL), | |
3355 | updates[i]->flags, | |
3356 | &types[i], onerr); | |
3357 | if (!locks[i]) { | |
3358 | ret = 1; | |
3359 | goto cleanup; | |
3360 | } | |
3361 | } | |
3362 | ||
3363 | /* Perform updates first so live commits remain referenced */ | |
3364 | for (i = 0; i < n; i++) | |
3365 | if (!is_null_sha1(updates[i]->new_sha1)) { | |
3366 | ret = update_ref_write(action, | |
3367 | updates[i]->ref_name, | |
3368 | updates[i]->new_sha1, | |
3369 | locks[i], onerr); | |
3370 | locks[i] = NULL; /* freed by update_ref_write */ | |
3371 | if (ret) | |
3372 | goto cleanup; | |
3373 | } | |
3374 | ||
3375 | /* Perform deletes now that updates are safely completed */ | |
3376 | for (i = 0; i < n; i++) | |
3377 | if (locks[i]) { | |
3378 | delnames[delnum++] = locks[i]->ref_name; | |
3379 | ret |= delete_ref_loose(locks[i], types[i]); | |
3380 | } | |
3381 | ret |= repack_without_refs(delnames, delnum); | |
3382 | for (i = 0; i < delnum; i++) | |
3383 | unlink_or_warn(git_path("logs/%s", delnames[i])); | |
3384 | clear_loose_ref_cache(&ref_cache); | |
3385 | ||
3386 | cleanup: | |
3387 | for (i = 0; i < n; i++) | |
3388 | if (locks[i]) | |
3389 | unlock_ref(locks[i]); | |
3390 | free(updates); | |
3391 | free(types); | |
3392 | free(locks); | |
3393 | free(delnames); | |
3394 | return ret; | |
3395 | } | |
3396 | ||
dfefa935 | 3397 | char *shorten_unambiguous_ref(const char *refname, int strict) |
7c2b3029 JK |
3398 | { |
3399 | int i; | |
3400 | static char **scanf_fmts; | |
3401 | static int nr_rules; | |
3402 | char *short_name; | |
3403 | ||
7c2b3029 | 3404 | if (!nr_rules) { |
4346663a MH |
3405 | /* |
3406 | * Pre-generate scanf formats from ref_rev_parse_rules[]. | |
3407 | * Generate a format suitable for scanf from a | |
3408 | * ref_rev_parse_rules rule by interpolating "%s" at the | |
3409 | * location of the "%.*s". | |
3410 | */ | |
7c2b3029 | 3411 | size_t total_len = 0; |
84d5633f | 3412 | size_t offset = 0; |
7c2b3029 JK |
3413 | |
3414 | /* the rule list is NULL terminated, count them first */ | |
a4165851 | 3415 | for (nr_rules = 0; ref_rev_parse_rules[nr_rules]; nr_rules++) |
7902fe03 MH |
3416 | /* -2 for strlen("%.*s") - strlen("%s"); +1 for NUL */ |
3417 | total_len += strlen(ref_rev_parse_rules[nr_rules]) - 2 + 1; | |
7c2b3029 JK |
3418 | |
3419 | scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len); | |
3420 | ||
84d5633f | 3421 | offset = 0; |
7c2b3029 | 3422 | for (i = 0; i < nr_rules; i++) { |
4346663a | 3423 | assert(offset < total_len); |
84d5633f | 3424 | scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] + offset; |
4346663a MH |
3425 | offset += snprintf(scanf_fmts[i], total_len - offset, |
3426 | ref_rev_parse_rules[i], 2, "%s") + 1; | |
7c2b3029 JK |
3427 | } |
3428 | } | |
3429 | ||
3430 | /* bail out if there are no rules */ | |
3431 | if (!nr_rules) | |
dfefa935 | 3432 | return xstrdup(refname); |
7c2b3029 | 3433 | |
dfefa935 MH |
3434 | /* buffer for scanf result, at most refname must fit */ |
3435 | short_name = xstrdup(refname); | |
7c2b3029 JK |
3436 | |
3437 | /* skip first rule, it will always match */ | |
3438 | for (i = nr_rules - 1; i > 0 ; --i) { | |
3439 | int j; | |
6e7b3309 | 3440 | int rules_to_fail = i; |
7c2b3029 JK |
3441 | int short_name_len; |
3442 | ||
dfefa935 | 3443 | if (1 != sscanf(refname, scanf_fmts[i], short_name)) |
7c2b3029 JK |
3444 | continue; |
3445 | ||
3446 | short_name_len = strlen(short_name); | |
3447 | ||
6e7b3309 BW |
3448 | /* |
3449 | * in strict mode, all (except the matched one) rules | |
3450 | * must fail to resolve to a valid non-ambiguous ref | |
3451 | */ | |
3452 | if (strict) | |
3453 | rules_to_fail = nr_rules; | |
3454 | ||
7c2b3029 JK |
3455 | /* |
3456 | * check if the short name resolves to a valid ref, | |
3457 | * but use only rules prior to the matched one | |
3458 | */ | |
6e7b3309 | 3459 | for (j = 0; j < rules_to_fail; j++) { |
7c2b3029 | 3460 | const char *rule = ref_rev_parse_rules[j]; |
7c2b3029 JK |
3461 | char refname[PATH_MAX]; |
3462 | ||
6e7b3309 BW |
3463 | /* skip matched rule */ |
3464 | if (i == j) | |
3465 | continue; | |
3466 | ||
7c2b3029 JK |
3467 | /* |
3468 | * the short name is ambiguous, if it resolves | |
3469 | * (with this previous rule) to a valid ref | |
3470 | * read_ref() returns 0 on success | |
3471 | */ | |
3472 | mksnpath(refname, sizeof(refname), | |
3473 | rule, short_name_len, short_name); | |
c6893323 | 3474 | if (ref_exists(refname)) |
7c2b3029 JK |
3475 | break; |
3476 | } | |
3477 | ||
3478 | /* | |
3479 | * short name is non-ambiguous if all previous rules | |
3480 | * haven't resolved to a valid ref | |
3481 | */ | |
6e7b3309 | 3482 | if (j == rules_to_fail) |
7c2b3029 JK |
3483 | return short_name; |
3484 | } | |
3485 | ||
3486 | free(short_name); | |
dfefa935 | 3487 | return xstrdup(refname); |
7c2b3029 | 3488 | } |
daebaa78 JH |
3489 | |
3490 | static struct string_list *hide_refs; | |
3491 | ||
3492 | int parse_hide_refs_config(const char *var, const char *value, const char *section) | |
3493 | { | |
3494 | if (!strcmp("transfer.hiderefs", var) || | |
3495 | /* NEEDSWORK: use parse_config_key() once both are merged */ | |
59556548 | 3496 | (starts_with(var, section) && var[strlen(section)] == '.' && |
daebaa78 JH |
3497 | !strcmp(var + strlen(section), ".hiderefs"))) { |
3498 | char *ref; | |
3499 | int len; | |
3500 | ||
3501 | if (!value) | |
3502 | return config_error_nonbool(var); | |
3503 | ref = xstrdup(value); | |
3504 | len = strlen(ref); | |
3505 | while (len && ref[len - 1] == '/') | |
3506 | ref[--len] = '\0'; | |
3507 | if (!hide_refs) { | |
3508 | hide_refs = xcalloc(1, sizeof(*hide_refs)); | |
3509 | hide_refs->strdup_strings = 1; | |
3510 | } | |
3511 | string_list_append(hide_refs, ref); | |
3512 | } | |
3513 | return 0; | |
3514 | } | |
3515 | ||
3516 | int ref_is_hidden(const char *refname) | |
3517 | { | |
3518 | struct string_list_item *item; | |
3519 | ||
3520 | if (!hide_refs) | |
3521 | return 0; | |
3522 | for_each_string_list_item(item, hide_refs) { | |
3523 | int len; | |
59556548 | 3524 | if (!starts_with(refname, item->string)) |
daebaa78 JH |
3525 | continue; |
3526 | len = strlen(item->string); | |
3527 | if (!refname[len] || refname[len] == '/') | |
3528 | return 1; | |
3529 | } | |
3530 | return 0; | |
3531 | } |