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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" |
95fc7512 | 6 | |
98ac34b2 JH |
7 | /* ISSYMREF=0x01, ISPACKED=0x02 and ISBROKEN=0x04 are public interfaces */ |
8 | #define REF_KNOWS_PEELED 0x10 | |
f4204ab9 | 9 | |
e1e22e37 LT |
10 | struct ref_list { |
11 | struct ref_list *next; | |
f4204ab9 | 12 | unsigned char flag; /* ISSYMREF? ISPACKED? */ |
e1e22e37 | 13 | unsigned char sha1[20]; |
f4204ab9 | 14 | unsigned char peeled[20]; |
e1e22e37 LT |
15 | char name[FLEX_ARRAY]; |
16 | }; | |
17 | ||
f4204ab9 | 18 | static const char *parse_ref_line(char *line, unsigned char *sha1) |
e1e22e37 LT |
19 | { |
20 | /* | |
21 | * 42: the answer to everything. | |
22 | * | |
23 | * In this case, it happens to be the answer to | |
24 | * 40 (length of sha1 hex representation) | |
25 | * +1 (space in between hex and name) | |
26 | * +1 (newline at the end of the line) | |
27 | */ | |
28 | int len = strlen(line) - 42; | |
29 | ||
30 | if (len <= 0) | |
31 | return NULL; | |
32 | if (get_sha1_hex(line, sha1) < 0) | |
33 | return NULL; | |
34 | if (!isspace(line[40])) | |
35 | return NULL; | |
36 | line += 41; | |
f4204ab9 JH |
37 | if (isspace(*line)) |
38 | return NULL; | |
e1e22e37 LT |
39 | if (line[len] != '\n') |
40 | return NULL; | |
41 | line[len] = 0; | |
cf0adba7 | 42 | |
e1e22e37 LT |
43 | return line; |
44 | } | |
45 | ||
8da19775 | 46 | static struct ref_list *add_ref(const char *name, const unsigned char *sha1, |
f4204ab9 JH |
47 | int flag, struct ref_list *list, |
48 | struct ref_list **new_entry) | |
e1e22e37 LT |
49 | { |
50 | int len; | |
c774aab9 | 51 | struct ref_list *entry; |
e1e22e37 LT |
52 | |
53 | /* Allocate it and add it in.. */ | |
54 | len = strlen(name) + 1; | |
55 | entry = xmalloc(sizeof(struct ref_list) + len); | |
56 | hashcpy(entry->sha1, sha1); | |
f4204ab9 | 57 | hashclr(entry->peeled); |
dce4bab6 MH |
58 | if (check_refname_format(name, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT)) |
59 | die("Reference has invalid format: '%s'", name); | |
e1e22e37 | 60 | memcpy(entry->name, name, len); |
8da19775 | 61 | entry->flag = flag; |
c774aab9 | 62 | entry->next = list; |
f4204ab9 JH |
63 | if (new_entry) |
64 | *new_entry = entry; | |
c774aab9 JP |
65 | return entry; |
66 | } | |
67 | ||
68 | /* merge sort the ref list */ | |
69 | static struct ref_list *sort_ref_list(struct ref_list *list) | |
70 | { | |
71 | int psize, qsize, last_merge_count, cmp; | |
72 | struct ref_list *p, *q, *l, *e; | |
73 | struct ref_list *new_list = list; | |
74 | int k = 1; | |
75 | int merge_count = 0; | |
76 | ||
77 | if (!list) | |
78 | return list; | |
79 | ||
80 | do { | |
81 | last_merge_count = merge_count; | |
82 | merge_count = 0; | |
83 | ||
84 | psize = 0; | |
85 | ||
86 | p = new_list; | |
87 | q = new_list; | |
88 | new_list = NULL; | |
89 | l = NULL; | |
90 | ||
91 | while (p) { | |
92 | merge_count++; | |
93 | ||
94 | while (psize < k && q->next) { | |
95 | q = q->next; | |
96 | psize++; | |
97 | } | |
98 | qsize = k; | |
99 | ||
100 | while ((psize > 0) || (qsize > 0 && q)) { | |
101 | if (qsize == 0 || !q) { | |
102 | e = p; | |
103 | p = p->next; | |
104 | psize--; | |
105 | } else if (psize == 0) { | |
106 | e = q; | |
107 | q = q->next; | |
108 | qsize--; | |
109 | } else { | |
110 | cmp = strcmp(q->name, p->name); | |
111 | if (cmp < 0) { | |
112 | e = q; | |
113 | q = q->next; | |
114 | qsize--; | |
115 | } else if (cmp > 0) { | |
116 | e = p; | |
117 | p = p->next; | |
118 | psize--; | |
119 | } else { | |
120 | if (hashcmp(q->sha1, p->sha1)) | |
121 | die("Duplicated ref, and SHA1s don't match: %s", | |
122 | q->name); | |
123 | warning("Duplicated ref: %s", q->name); | |
124 | e = q; | |
125 | q = q->next; | |
126 | qsize--; | |
127 | free(e); | |
128 | e = p; | |
129 | p = p->next; | |
130 | psize--; | |
131 | } | |
132 | } | |
133 | ||
134 | e->next = NULL; | |
135 | ||
136 | if (l) | |
137 | l->next = e; | |
138 | if (!new_list) | |
139 | new_list = e; | |
140 | l = e; | |
141 | } | |
142 | ||
143 | p = q; | |
144 | }; | |
145 | ||
146 | k = k * 2; | |
147 | } while ((last_merge_count != merge_count) || (last_merge_count != 1)); | |
148 | ||
149 | return new_list; | |
e1e22e37 LT |
150 | } |
151 | ||
5e290ff7 JH |
152 | /* |
153 | * Future: need to be in "struct repository" | |
154 | * when doing a full libification. | |
155 | */ | |
4175e9e3 | 156 | static struct cached_refs { |
5e290ff7 JH |
157 | char did_loose; |
158 | char did_packed; | |
159 | struct ref_list *loose; | |
160 | struct ref_list *packed; | |
0bad611b | 161 | } cached_refs, submodule_refs; |
0ae91be0 | 162 | static struct ref_list *current_ref; |
5e290ff7 | 163 | |
e142a3c6 DB |
164 | static struct ref_list *extra_refs; |
165 | ||
5e290ff7 JH |
166 | static void free_ref_list(struct ref_list *list) |
167 | { | |
168 | struct ref_list *next; | |
169 | for ( ; list; list = next) { | |
170 | next = list->next; | |
171 | free(list); | |
172 | } | |
173 | } | |
174 | ||
175 | static void invalidate_cached_refs(void) | |
e1e22e37 | 176 | { |
5e290ff7 JH |
177 | struct cached_refs *ca = &cached_refs; |
178 | ||
179 | if (ca->did_loose && ca->loose) | |
180 | free_ref_list(ca->loose); | |
181 | if (ca->did_packed && ca->packed) | |
182 | free_ref_list(ca->packed); | |
183 | ca->loose = ca->packed = NULL; | |
184 | ca->did_loose = ca->did_packed = 0; | |
185 | } | |
e1e22e37 | 186 | |
f4204ab9 JH |
187 | static void read_packed_refs(FILE *f, struct cached_refs *cached_refs) |
188 | { | |
189 | struct ref_list *list = NULL; | |
190 | struct ref_list *last = NULL; | |
191 | char refline[PATH_MAX]; | |
192 | int flag = REF_ISPACKED; | |
193 | ||
194 | while (fgets(refline, sizeof(refline), f)) { | |
195 | unsigned char sha1[20]; | |
196 | const char *name; | |
197 | static const char header[] = "# pack-refs with:"; | |
198 | ||
199 | if (!strncmp(refline, header, sizeof(header)-1)) { | |
200 | const char *traits = refline + sizeof(header) - 1; | |
201 | if (strstr(traits, " peeled ")) | |
202 | flag |= REF_KNOWS_PEELED; | |
203 | /* perhaps other traits later as well */ | |
204 | continue; | |
205 | } | |
206 | ||
207 | name = parse_ref_line(refline, sha1); | |
208 | if (name) { | |
209 | list = add_ref(name, sha1, flag, list, &last); | |
210 | continue; | |
211 | } | |
212 | if (last && | |
213 | refline[0] == '^' && | |
214 | strlen(refline) == 42 && | |
215 | refline[41] == '\n' && | |
216 | !get_sha1_hex(refline + 1, sha1)) | |
217 | hashcpy(last->peeled, sha1); | |
218 | } | |
c774aab9 | 219 | cached_refs->packed = sort_ref_list(list); |
f4204ab9 JH |
220 | } |
221 | ||
e142a3c6 DB |
222 | void add_extra_ref(const char *name, const unsigned char *sha1, int flag) |
223 | { | |
224 | extra_refs = add_ref(name, sha1, flag, extra_refs, NULL); | |
225 | } | |
226 | ||
227 | void clear_extra_refs(void) | |
228 | { | |
229 | free_ref_list(extra_refs); | |
230 | extra_refs = NULL; | |
231 | } | |
232 | ||
0bad611b | 233 | static struct ref_list *get_packed_refs(const char *submodule) |
5e290ff7 | 234 | { |
0bad611b HV |
235 | const char *packed_refs_file; |
236 | struct cached_refs *refs; | |
237 | ||
238 | if (submodule) { | |
239 | packed_refs_file = git_path_submodule(submodule, "packed-refs"); | |
240 | refs = &submodule_refs; | |
241 | free_ref_list(refs->packed); | |
242 | } else { | |
243 | packed_refs_file = git_path("packed-refs"); | |
244 | refs = &cached_refs; | |
245 | } | |
246 | ||
247 | if (!refs->did_packed || submodule) { | |
248 | FILE *f = fopen(packed_refs_file, "r"); | |
249 | refs->packed = NULL; | |
e1e22e37 | 250 | if (f) { |
0bad611b | 251 | read_packed_refs(f, refs); |
e1e22e37 | 252 | fclose(f); |
e1e22e37 | 253 | } |
0bad611b | 254 | refs->did_packed = 1; |
e1e22e37 | 255 | } |
0bad611b | 256 | return refs->packed; |
e1e22e37 LT |
257 | } |
258 | ||
0bad611b HV |
259 | static struct ref_list *get_ref_dir(const char *submodule, const char *base, |
260 | struct ref_list *list) | |
e1e22e37 | 261 | { |
0bad611b HV |
262 | DIR *dir; |
263 | const char *path; | |
264 | ||
265 | if (submodule) | |
266 | path = git_path_submodule(submodule, "%s", base); | |
267 | else | |
268 | path = git_path("%s", base); | |
269 | ||
270 | ||
271 | dir = opendir(path); | |
e1e22e37 LT |
272 | |
273 | if (dir) { | |
274 | struct dirent *de; | |
275 | int baselen = strlen(base); | |
ed378ec7 | 276 | char *ref = xmalloc(baselen + 257); |
e1e22e37 | 277 | |
ed378ec7 | 278 | memcpy(ref, base, baselen); |
e1e22e37 | 279 | if (baselen && base[baselen-1] != '/') |
ed378ec7 | 280 | ref[baselen++] = '/'; |
e1e22e37 LT |
281 | |
282 | while ((de = readdir(dir)) != NULL) { | |
283 | unsigned char sha1[20]; | |
284 | struct stat st; | |
8da19775 | 285 | int flag; |
e1e22e37 | 286 | int namelen; |
0bad611b | 287 | const char *refdir; |
e1e22e37 LT |
288 | |
289 | if (de->d_name[0] == '.') | |
290 | continue; | |
291 | namelen = strlen(de->d_name); | |
292 | if (namelen > 255) | |
293 | continue; | |
294 | if (has_extension(de->d_name, ".lock")) | |
295 | continue; | |
ed378ec7 | 296 | memcpy(ref + baselen, de->d_name, namelen+1); |
0bad611b HV |
297 | refdir = submodule |
298 | ? git_path_submodule(submodule, "%s", ref) | |
299 | : git_path("%s", ref); | |
300 | if (stat(refdir, &st) < 0) | |
e1e22e37 LT |
301 | continue; |
302 | if (S_ISDIR(st.st_mode)) { | |
0bad611b | 303 | list = get_ref_dir(submodule, ref, list); |
e1e22e37 LT |
304 | continue; |
305 | } | |
0bad611b | 306 | if (submodule) { |
f8948e2f | 307 | hashclr(sha1); |
0bad611b HV |
308 | flag = 0; |
309 | if (resolve_gitlink_ref(submodule, ref, sha1) < 0) { | |
310 | hashclr(sha1); | |
98ac34b2 | 311 | flag |= REF_ISBROKEN; |
0bad611b HV |
312 | } |
313 | } else | |
314 | if (!resolve_ref(ref, sha1, 1, &flag)) { | |
315 | hashclr(sha1); | |
98ac34b2 | 316 | flag |= REF_ISBROKEN; |
0bad611b | 317 | } |
f4204ab9 | 318 | list = add_ref(ref, sha1, flag, list, NULL); |
e1e22e37 | 319 | } |
ed378ec7 | 320 | free(ref); |
e1e22e37 LT |
321 | closedir(dir); |
322 | } | |
c774aab9 | 323 | return sort_ref_list(list); |
e1e22e37 LT |
324 | } |
325 | ||
f8948e2f | 326 | struct warn_if_dangling_data { |
3cf6134a | 327 | FILE *fp; |
f8948e2f JH |
328 | const char *refname; |
329 | const char *msg_fmt; | |
330 | }; | |
331 | ||
332 | static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1, | |
333 | int flags, void *cb_data) | |
334 | { | |
335 | struct warn_if_dangling_data *d = cb_data; | |
336 | const char *resolves_to; | |
337 | unsigned char junk[20]; | |
338 | ||
339 | if (!(flags & REF_ISSYMREF)) | |
340 | return 0; | |
341 | ||
342 | resolves_to = resolve_ref(refname, junk, 0, NULL); | |
343 | if (!resolves_to || strcmp(resolves_to, d->refname)) | |
344 | return 0; | |
345 | ||
3cf6134a | 346 | fprintf(d->fp, d->msg_fmt, refname); |
f8948e2f JH |
347 | return 0; |
348 | } | |
349 | ||
3cf6134a | 350 | void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname) |
f8948e2f | 351 | { |
66dbfd55 GV |
352 | struct warn_if_dangling_data data; |
353 | ||
354 | data.fp = fp; | |
355 | data.refname = refname; | |
356 | data.msg_fmt = msg_fmt; | |
f8948e2f JH |
357 | for_each_rawref(warn_if_dangling_symref, &data); |
358 | } | |
359 | ||
0bad611b | 360 | static struct ref_list *get_loose_refs(const char *submodule) |
e1e22e37 | 361 | { |
0bad611b HV |
362 | if (submodule) { |
363 | free_ref_list(submodule_refs.loose); | |
364 | submodule_refs.loose = get_ref_dir(submodule, "refs", NULL); | |
365 | return submodule_refs.loose; | |
366 | } | |
367 | ||
5e290ff7 | 368 | if (!cached_refs.did_loose) { |
0bad611b | 369 | cached_refs.loose = get_ref_dir(NULL, "refs", NULL); |
5e290ff7 | 370 | cached_refs.did_loose = 1; |
e1e22e37 | 371 | } |
5e290ff7 | 372 | return cached_refs.loose; |
e1e22e37 LT |
373 | } |
374 | ||
ca8db142 LT |
375 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
376 | #define MAXDEPTH 5 | |
0ebde32c LT |
377 | #define MAXREFLEN (1024) |
378 | ||
379 | static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result) | |
380 | { | |
381 | FILE *f; | |
382 | struct cached_refs refs; | |
383 | struct ref_list *ref; | |
384 | int retval; | |
385 | ||
386 | strcpy(name + pathlen, "packed-refs"); | |
387 | f = fopen(name, "r"); | |
388 | if (!f) | |
389 | return -1; | |
390 | read_packed_refs(f, &refs); | |
391 | fclose(f); | |
392 | ref = refs.packed; | |
393 | retval = -1; | |
394 | while (ref) { | |
395 | if (!strcmp(ref->name, refname)) { | |
396 | retval = 0; | |
397 | memcpy(result, ref->sha1, 20); | |
398 | break; | |
399 | } | |
400 | ref = ref->next; | |
401 | } | |
402 | free_ref_list(refs.packed); | |
403 | return retval; | |
404 | } | |
405 | ||
406 | static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion) | |
407 | { | |
408 | int fd, len = strlen(refname); | |
409 | char buffer[128], *p; | |
410 | ||
411 | if (recursion > MAXDEPTH || len > MAXREFLEN) | |
412 | return -1; | |
413 | memcpy(name + pathlen, refname, len+1); | |
414 | fd = open(name, O_RDONLY); | |
415 | if (fd < 0) | |
416 | return resolve_gitlink_packed_ref(name, pathlen, refname, result); | |
417 | ||
418 | len = read(fd, buffer, sizeof(buffer)-1); | |
419 | close(fd); | |
420 | if (len < 0) | |
421 | return -1; | |
422 | while (len && isspace(buffer[len-1])) | |
423 | len--; | |
424 | buffer[len] = 0; | |
425 | ||
426 | /* Was it a detached head or an old-fashioned symlink? */ | |
427 | if (!get_sha1_hex(buffer, result)) | |
428 | return 0; | |
429 | ||
430 | /* Symref? */ | |
431 | if (strncmp(buffer, "ref:", 4)) | |
432 | return -1; | |
433 | p = buffer + 4; | |
434 | while (isspace(*p)) | |
435 | p++; | |
436 | ||
437 | return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1); | |
438 | } | |
439 | ||
440 | int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result) | |
441 | { | |
442 | int len = strlen(path), retval; | |
443 | char *gitdir; | |
842abf06 | 444 | const char *tmp; |
0ebde32c LT |
445 | |
446 | while (len && path[len-1] == '/') | |
447 | len--; | |
448 | if (!len) | |
449 | return -1; | |
450 | gitdir = xmalloc(len + MAXREFLEN + 8); | |
451 | memcpy(gitdir, path, len); | |
842abf06 LH |
452 | memcpy(gitdir + len, "/.git", 6); |
453 | len += 5; | |
454 | ||
13d6ec91 | 455 | tmp = read_gitfile(gitdir); |
842abf06 LH |
456 | if (tmp) { |
457 | free(gitdir); | |
458 | len = strlen(tmp); | |
459 | gitdir = xmalloc(len + MAXREFLEN + 3); | |
460 | memcpy(gitdir, tmp, len); | |
461 | } | |
462 | gitdir[len] = '/'; | |
463 | gitdir[++len] = '\0'; | |
464 | retval = resolve_gitlink_ref_recursive(gitdir, len, refname, result, 0); | |
0ebde32c LT |
465 | free(gitdir); |
466 | return retval; | |
467 | } | |
ca8db142 | 468 | |
c224ca7f MH |
469 | /* |
470 | * Try to read ref from the packed references. On success, set sha1 | |
471 | * and return 0; otherwise, return -1. | |
472 | */ | |
473 | static int get_packed_ref(const char *ref, unsigned char *sha1) | |
474 | { | |
475 | struct ref_list *list = get_packed_refs(NULL); | |
476 | while (list) { | |
477 | if (!strcmp(ref, list->name)) { | |
478 | hashcpy(sha1, list->sha1); | |
479 | return 0; | |
480 | } | |
481 | list = list->next; | |
482 | } | |
483 | return -1; | |
484 | } | |
485 | ||
8da19775 | 486 | const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 487 | { |
0104ca09 HO |
488 | int depth = MAXDEPTH; |
489 | ssize_t len; | |
a876ed83 | 490 | char buffer[256]; |
ed378ec7 | 491 | static char ref_buffer[256]; |
629cd3ac | 492 | char path[PATH_MAX]; |
ca8db142 | 493 | |
8da19775 JH |
494 | if (flag) |
495 | *flag = 0; | |
496 | ||
8384d788 MH |
497 | if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL)) |
498 | return NULL; | |
499 | ||
a876ed83 JH |
500 | for (;;) { |
501 | struct stat st; | |
502 | char *buf; | |
503 | int fd; | |
8a65ff76 | 504 | |
a876ed83 JH |
505 | if (--depth < 0) |
506 | return NULL; | |
ca8db142 | 507 | |
958a4789 | 508 | git_snpath(path, sizeof(path), "%s", ref); |
c224ca7f | 509 | |
a876ed83 | 510 | if (lstat(path, &st) < 0) { |
c224ca7f MH |
511 | if (errno != ENOENT) |
512 | return NULL; | |
513 | /* | |
514 | * The loose reference file does not exist; | |
515 | * check for a packed reference. | |
516 | */ | |
517 | if (!get_packed_ref(ref, sha1)) { | |
518 | if (flag) | |
519 | *flag |= REF_ISPACKED; | |
520 | return ref; | |
434cd0cd | 521 | } |
c224ca7f MH |
522 | /* The reference is not a packed reference, either. */ |
523 | if (reading) { | |
a876ed83 | 524 | return NULL; |
c224ca7f MH |
525 | } else { |
526 | hashclr(sha1); | |
527 | return ref; | |
528 | } | |
a876ed83 | 529 | } |
ca8db142 | 530 | |
a876ed83 JH |
531 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
532 | if (S_ISLNK(st.st_mode)) { | |
533 | len = readlink(path, buffer, sizeof(buffer)-1); | |
7bb2bf8e MH |
534 | if (len < 0) |
535 | return NULL; | |
b54cb795 | 536 | buffer[len] = 0; |
1f58a038 MH |
537 | if (!prefixcmp(buffer, "refs/") && |
538 | !check_refname_format(buffer, 0)) { | |
ed378ec7 LT |
539 | strcpy(ref_buffer, buffer); |
540 | ref = ref_buffer; | |
8da19775 JH |
541 | if (flag) |
542 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
543 | continue; |
544 | } | |
ca8db142 | 545 | } |
a876ed83 | 546 | |
7a21632f DS |
547 | /* Is it a directory? */ |
548 | if (S_ISDIR(st.st_mode)) { | |
549 | errno = EISDIR; | |
550 | return NULL; | |
551 | } | |
552 | ||
a876ed83 JH |
553 | /* |
554 | * Anything else, just open it and try to use it as | |
555 | * a ref | |
556 | */ | |
557 | fd = open(path, O_RDONLY); | |
558 | if (fd < 0) | |
559 | return NULL; | |
93d26e4c | 560 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
a876ed83 | 561 | close(fd); |
28775050 MH |
562 | if (len < 0) |
563 | return NULL; | |
564 | while (len && isspace(buffer[len-1])) | |
565 | len--; | |
566 | buffer[len] = '\0'; | |
a876ed83 JH |
567 | |
568 | /* | |
569 | * Is it a symbolic ref? | |
570 | */ | |
28775050 | 571 | if (prefixcmp(buffer, "ref:")) |
a876ed83 JH |
572 | break; |
573 | buf = buffer + 4; | |
28775050 MH |
574 | while (isspace(*buf)) |
575 | buf++; | |
313fb010 MH |
576 | if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) { |
577 | warning("symbolic reference in %s is formatted incorrectly", | |
578 | path); | |
579 | return NULL; | |
580 | } | |
28775050 | 581 | ref = strcpy(ref_buffer, buf); |
8da19775 JH |
582 | if (flag) |
583 | *flag |= REF_ISSYMREF; | |
8a65ff76 | 584 | } |
f989fea0 MH |
585 | /* Please note that FETCH_HEAD has a second line containing other data. */ |
586 | if (get_sha1_hex(buffer, sha1) || (buffer[40] != '\0' && !isspace(buffer[40]))) { | |
629cd3ac | 587 | warning("reference in %s is formatted incorrectly", path); |
a876ed83 | 588 | return NULL; |
629cd3ac | 589 | } |
ed378ec7 | 590 | return ref; |
a876ed83 JH |
591 | } |
592 | ||
d08bae7e IL |
593 | /* The argument to filter_refs */ |
594 | struct ref_filter { | |
595 | const char *pattern; | |
596 | each_ref_fn *fn; | |
597 | void *cb_data; | |
598 | }; | |
599 | ||
ed378ec7 | 600 | int read_ref(const char *ref, unsigned char *sha1) |
a876ed83 | 601 | { |
8da19775 | 602 | if (resolve_ref(ref, sha1, 1, NULL)) |
a876ed83 JH |
603 | return 0; |
604 | return -1; | |
8a65ff76 LT |
605 | } |
606 | ||
f8948e2f | 607 | #define DO_FOR_EACH_INCLUDE_BROKEN 01 |
ef06b918 | 608 | static int do_one_ref(const char *base, each_ref_fn fn, int trim, |
f8948e2f | 609 | int flags, void *cb_data, struct ref_list *entry) |
ef06b918 | 610 | { |
b3cfc406 | 611 | if (prefixcmp(entry->name, base)) |
ef06b918 | 612 | return 0; |
e01de1c9 | 613 | |
f8948e2f | 614 | if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) { |
98ac34b2 JH |
615 | if (entry->flag & REF_ISBROKEN) |
616 | return 0; /* ignore broken refs e.g. dangling symref */ | |
f8948e2f JH |
617 | if (!has_sha1_file(entry->sha1)) { |
618 | error("%s does not point to a valid object!", entry->name); | |
619 | return 0; | |
620 | } | |
ef06b918 | 621 | } |
0ae91be0 | 622 | current_ref = entry; |
ef06b918 JH |
623 | return fn(entry->name + trim, entry->sha1, entry->flag, cb_data); |
624 | } | |
625 | ||
d08bae7e IL |
626 | static int filter_refs(const char *ref, const unsigned char *sha, int flags, |
627 | void *data) | |
628 | { | |
629 | struct ref_filter *filter = (struct ref_filter *)data; | |
630 | if (fnmatch(filter->pattern, ref, 0)) | |
631 | return 0; | |
632 | return filter->fn(ref, sha, flags, filter->cb_data); | |
633 | } | |
634 | ||
cf0adba7 JH |
635 | int peel_ref(const char *ref, unsigned char *sha1) |
636 | { | |
637 | int flag; | |
638 | unsigned char base[20]; | |
639 | struct object *o; | |
640 | ||
0ae91be0 SP |
641 | if (current_ref && (current_ref->name == ref |
642 | || !strcmp(current_ref->name, ref))) { | |
643 | if (current_ref->flag & REF_KNOWS_PEELED) { | |
644 | hashcpy(sha1, current_ref->peeled); | |
645 | return 0; | |
646 | } | |
647 | hashcpy(base, current_ref->sha1); | |
648 | goto fallback; | |
649 | } | |
650 | ||
cf0adba7 JH |
651 | if (!resolve_ref(ref, base, 1, &flag)) |
652 | return -1; | |
653 | ||
654 | if ((flag & REF_ISPACKED)) { | |
0bad611b | 655 | struct ref_list *list = get_packed_refs(NULL); |
cf0adba7 JH |
656 | |
657 | while (list) { | |
f4204ab9 JH |
658 | if (!strcmp(list->name, ref)) { |
659 | if (list->flag & REF_KNOWS_PEELED) { | |
660 | hashcpy(sha1, list->peeled); | |
661 | return 0; | |
662 | } | |
663 | /* older pack-refs did not leave peeled ones */ | |
664 | break; | |
cf0adba7 JH |
665 | } |
666 | list = list->next; | |
667 | } | |
cf0adba7 JH |
668 | } |
669 | ||
0ae91be0 | 670 | fallback: |
cf0adba7 | 671 | o = parse_object(base); |
8c87dc77 | 672 | if (o && o->type == OBJ_TAG) { |
cf0adba7 JH |
673 | o = deref_tag(o, ref, 0); |
674 | if (o) { | |
675 | hashcpy(sha1, o->sha1); | |
676 | return 0; | |
677 | } | |
678 | } | |
679 | return -1; | |
680 | } | |
681 | ||
0bad611b HV |
682 | static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn, |
683 | int trim, int flags, void *cb_data) | |
8a65ff76 | 684 | { |
0ae91be0 | 685 | int retval = 0; |
0bad611b HV |
686 | struct ref_list *packed = get_packed_refs(submodule); |
687 | struct ref_list *loose = get_loose_refs(submodule); | |
8a65ff76 | 688 | |
e142a3c6 DB |
689 | struct ref_list *extra; |
690 | ||
691 | for (extra = extra_refs; extra; extra = extra->next) | |
f8948e2f | 692 | retval = do_one_ref(base, fn, trim, flags, cb_data, extra); |
e142a3c6 | 693 | |
e1e22e37 LT |
694 | while (packed && loose) { |
695 | struct ref_list *entry; | |
696 | int cmp = strcmp(packed->name, loose->name); | |
697 | if (!cmp) { | |
698 | packed = packed->next; | |
699 | continue; | |
6cada6a9 | 700 | } |
e1e22e37 LT |
701 | if (cmp > 0) { |
702 | entry = loose; | |
703 | loose = loose->next; | |
704 | } else { | |
705 | entry = packed; | |
706 | packed = packed->next; | |
707 | } | |
f8948e2f | 708 | retval = do_one_ref(base, fn, trim, flags, cb_data, entry); |
e1e22e37 | 709 | if (retval) |
0ae91be0 | 710 | goto end_each; |
e1e22e37 | 711 | } |
8a65ff76 | 712 | |
ef06b918 | 713 | for (packed = packed ? packed : loose; packed; packed = packed->next) { |
f8948e2f | 714 | retval = do_one_ref(base, fn, trim, flags, cb_data, packed); |
ef06b918 | 715 | if (retval) |
0ae91be0 | 716 | goto end_each; |
8a65ff76 | 717 | } |
0ae91be0 SP |
718 | |
719 | end_each: | |
720 | current_ref = NULL; | |
721 | return retval; | |
8a65ff76 LT |
722 | } |
723 | ||
0bad611b HV |
724 | |
725 | static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data) | |
723c31fe LT |
726 | { |
727 | unsigned char sha1[20]; | |
8da19775 JH |
728 | int flag; |
729 | ||
0bad611b HV |
730 | if (submodule) { |
731 | if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0) | |
732 | return fn("HEAD", sha1, 0, cb_data); | |
733 | ||
734 | return 0; | |
735 | } | |
736 | ||
8da19775 JH |
737 | if (resolve_ref("HEAD", sha1, 1, &flag)) |
738 | return fn("HEAD", sha1, flag, cb_data); | |
0bad611b | 739 | |
2f34ba32 | 740 | return 0; |
723c31fe LT |
741 | } |
742 | ||
0bad611b HV |
743 | int head_ref(each_ref_fn fn, void *cb_data) |
744 | { | |
745 | return do_head_ref(NULL, fn, cb_data); | |
746 | } | |
747 | ||
9ef6aeb0 HV |
748 | int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
749 | { | |
750 | return do_head_ref(submodule, fn, cb_data); | |
751 | } | |
752 | ||
cb5d709f | 753 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 754 | { |
b3cfc406 | 755 | return do_for_each_ref(NULL, "", fn, 0, 0, cb_data); |
a62be77f SE |
756 | } |
757 | ||
9ef6aeb0 HV |
758 | int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
759 | { | |
b3cfc406 | 760 | return do_for_each_ref(submodule, "", fn, 0, 0, cb_data); |
a62be77f SE |
761 | } |
762 | ||
2a8177b6 CC |
763 | int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data) |
764 | { | |
0bad611b | 765 | return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data); |
2a8177b6 CC |
766 | } |
767 | ||
9ef6aeb0 HV |
768 | int for_each_ref_in_submodule(const char *submodule, const char *prefix, |
769 | each_ref_fn fn, void *cb_data) | |
770 | { | |
771 | return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data); | |
2a8177b6 CC |
772 | } |
773 | ||
cb5d709f | 774 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 775 | { |
2a8177b6 | 776 | return for_each_ref_in("refs/tags/", fn, cb_data); |
a62be77f SE |
777 | } |
778 | ||
9ef6aeb0 HV |
779 | int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
780 | { | |
781 | return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data); | |
782 | } | |
783 | ||
cb5d709f | 784 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 785 | { |
2a8177b6 | 786 | return for_each_ref_in("refs/heads/", fn, cb_data); |
a62be77f SE |
787 | } |
788 | ||
9ef6aeb0 HV |
789 | int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
790 | { | |
791 | return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data); | |
792 | } | |
793 | ||
cb5d709f | 794 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 795 | { |
2a8177b6 | 796 | return for_each_ref_in("refs/remotes/", fn, cb_data); |
f8948e2f JH |
797 | } |
798 | ||
9ef6aeb0 HV |
799 | int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
800 | { | |
801 | return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data); | |
802 | } | |
803 | ||
29268700 CC |
804 | int for_each_replace_ref(each_ref_fn fn, void *cb_data) |
805 | { | |
0bad611b | 806 | return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data); |
29268700 CC |
807 | } |
808 | ||
a1bea2c1 JT |
809 | int head_ref_namespaced(each_ref_fn fn, void *cb_data) |
810 | { | |
811 | struct strbuf buf = STRBUF_INIT; | |
812 | int ret = 0; | |
813 | unsigned char sha1[20]; | |
814 | int flag; | |
815 | ||
816 | strbuf_addf(&buf, "%sHEAD", get_git_namespace()); | |
817 | if (resolve_ref(buf.buf, sha1, 1, &flag)) | |
818 | ret = fn(buf.buf, sha1, flag, cb_data); | |
819 | strbuf_release(&buf); | |
820 | ||
821 | return ret; | |
822 | } | |
823 | ||
824 | int for_each_namespaced_ref(each_ref_fn fn, void *cb_data) | |
825 | { | |
826 | struct strbuf buf = STRBUF_INIT; | |
827 | int ret; | |
828 | strbuf_addf(&buf, "%srefs/", get_git_namespace()); | |
829 | ret = do_for_each_ref(NULL, buf.buf, fn, 0, 0, cb_data); | |
830 | strbuf_release(&buf); | |
831 | return ret; | |
832 | } | |
833 | ||
b09fe971 IL |
834 | int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, |
835 | const char *prefix, void *cb_data) | |
d08bae7e IL |
836 | { |
837 | struct strbuf real_pattern = STRBUF_INIT; | |
838 | struct ref_filter filter; | |
d08bae7e IL |
839 | int ret; |
840 | ||
b09fe971 | 841 | if (!prefix && prefixcmp(pattern, "refs/")) |
d08bae7e | 842 | strbuf_addstr(&real_pattern, "refs/"); |
b09fe971 IL |
843 | else if (prefix) |
844 | strbuf_addstr(&real_pattern, prefix); | |
d08bae7e IL |
845 | strbuf_addstr(&real_pattern, pattern); |
846 | ||
894a9d33 | 847 | if (!has_glob_specials(pattern)) { |
9517e6b8 | 848 | /* Append implied '/' '*' if not present. */ |
d08bae7e IL |
849 | if (real_pattern.buf[real_pattern.len - 1] != '/') |
850 | strbuf_addch(&real_pattern, '/'); | |
851 | /* No need to check for '*', there is none. */ | |
852 | strbuf_addch(&real_pattern, '*'); | |
853 | } | |
854 | ||
855 | filter.pattern = real_pattern.buf; | |
856 | filter.fn = fn; | |
857 | filter.cb_data = cb_data; | |
858 | ret = for_each_ref(filter_refs, &filter); | |
859 | ||
860 | strbuf_release(&real_pattern); | |
861 | return ret; | |
862 | } | |
863 | ||
b09fe971 IL |
864 | int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data) |
865 | { | |
866 | return for_each_glob_ref_in(fn, pattern, NULL, cb_data); | |
867 | } | |
868 | ||
f8948e2f JH |
869 | int for_each_rawref(each_ref_fn fn, void *cb_data) |
870 | { | |
b3cfc406 | 871 | return do_for_each_ref(NULL, "", fn, 0, |
f8948e2f | 872 | DO_FOR_EACH_INCLUDE_BROKEN, cb_data); |
8a65ff76 LT |
873 | } |
874 | ||
03feddd6 JH |
875 | /* |
876 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
877 | * We do not like it if: | |
878 | * | |
879 | * - any path component of it begins with ".", or | |
880 | * - it has double dots "..", or | |
881 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
882 | * - it ends with a "/". | |
3e262b95 | 883 | * - it ends with ".lock" |
a4c2e699 | 884 | * - it contains a "\" (backslash) |
03feddd6 JH |
885 | */ |
886 | ||
9224b73b | 887 | /* Return true iff ch is not allowed in reference names. */ |
03feddd6 JH |
888 | static inline int bad_ref_char(int ch) |
889 | { | |
f3738c1c | 890 | if (((unsigned) ch) <= ' ' || ch == 0x7f || |
a4c2e699 | 891 | ch == '~' || ch == '^' || ch == ':' || ch == '\\') |
8558fd9e DB |
892 | return 1; |
893 | /* 2.13 Pattern Matching Notation */ | |
9224b73b | 894 | if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */ |
8558fd9e | 895 | return 1; |
8558fd9e | 896 | return 0; |
03feddd6 JH |
897 | } |
898 | ||
49295d4e MH |
899 | /* |
900 | * Try to read one refname component from the front of ref. Return | |
901 | * the length of the component found, or -1 if the component is not | |
902 | * legal. | |
903 | */ | |
dce4bab6 | 904 | static int check_refname_component(const char *ref, int flags) |
49295d4e MH |
905 | { |
906 | const char *cp; | |
907 | char last = '\0'; | |
908 | ||
909 | for (cp = ref; ; cp++) { | |
910 | char ch = *cp; | |
911 | if (ch == '\0' || ch == '/') | |
912 | break; | |
913 | if (bad_ref_char(ch)) | |
914 | return -1; /* Illegal character in refname. */ | |
915 | if (last == '.' && ch == '.') | |
916 | return -1; /* Refname contains "..". */ | |
917 | if (last == '@' && ch == '{') | |
918 | return -1; /* Refname contains "@{". */ | |
919 | last = ch; | |
920 | } | |
921 | if (cp == ref) | |
922 | return -1; /* Component has zero length. */ | |
dce4bab6 MH |
923 | if (ref[0] == '.') { |
924 | if (!(flags & REFNAME_DOT_COMPONENT)) | |
925 | return -1; /* Component starts with '.'. */ | |
926 | /* | |
927 | * Even if leading dots are allowed, don't allow "." | |
928 | * as a component (".." is prevented by a rule above). | |
929 | */ | |
930 | if (ref[1] == '\0') | |
931 | return -1; /* Component equals ".". */ | |
932 | } | |
7e9d2fe9 MH |
933 | if (cp - ref >= 5 && !memcmp(cp - 5, ".lock", 5)) |
934 | return -1; /* Refname ends with ".lock". */ | |
49295d4e MH |
935 | return cp - ref; |
936 | } | |
937 | ||
8d9c5010 | 938 | int check_refname_format(const char *ref, int flags) |
95fc7512 | 939 | { |
49295d4e | 940 | int component_len, component_count = 0; |
03feddd6 | 941 | |
03feddd6 | 942 | while (1) { |
49295d4e | 943 | /* We are at the start of a path component. */ |
dce4bab6 | 944 | component_len = check_refname_component(ref, flags); |
49295d4e MH |
945 | if (component_len < 0) { |
946 | if ((flags & REFNAME_REFSPEC_PATTERN) && | |
947 | ref[0] == '*' && | |
948 | (ref[1] == '\0' || ref[1] == '/')) { | |
8d9c5010 MH |
949 | /* Accept one wildcard as a full refname component. */ |
950 | flags &= ~REFNAME_REFSPEC_PATTERN; | |
49295d4e MH |
951 | component_len = 1; |
952 | } else { | |
8d9c5010 | 953 | return -1; |
49295d4e | 954 | } |
03feddd6 | 955 | } |
49295d4e MH |
956 | component_count++; |
957 | if (ref[component_len] == '\0') | |
958 | break; | |
959 | /* Skip to next component. */ | |
960 | ref += component_len + 1; | |
03feddd6 | 961 | } |
49295d4e MH |
962 | |
963 | if (ref[component_len - 1] == '.') | |
964 | return -1; /* Refname ends with '.'. */ | |
49295d4e MH |
965 | if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2) |
966 | return -1; /* Refname has only one component. */ | |
967 | return 0; | |
95fc7512 DB |
968 | } |
969 | ||
4577e483 | 970 | const char *prettify_refname(const char *name) |
a9c37a72 | 971 | { |
a9c37a72 DB |
972 | return name + ( |
973 | !prefixcmp(name, "refs/heads/") ? 11 : | |
974 | !prefixcmp(name, "refs/tags/") ? 10 : | |
975 | !prefixcmp(name, "refs/remotes/") ? 13 : | |
976 | 0); | |
977 | } | |
978 | ||
79803322 SP |
979 | const char *ref_rev_parse_rules[] = { |
980 | "%.*s", | |
981 | "refs/%.*s", | |
982 | "refs/tags/%.*s", | |
983 | "refs/heads/%.*s", | |
984 | "refs/remotes/%.*s", | |
985 | "refs/remotes/%.*s/HEAD", | |
986 | NULL | |
987 | }; | |
988 | ||
605b4978 SP |
989 | const char *ref_fetch_rules[] = { |
990 | "%.*s", | |
991 | "refs/%.*s", | |
992 | "refs/heads/%.*s", | |
993 | NULL | |
994 | }; | |
995 | ||
79803322 SP |
996 | int refname_match(const char *abbrev_name, const char *full_name, const char **rules) |
997 | { | |
998 | const char **p; | |
999 | const int abbrev_name_len = strlen(abbrev_name); | |
1000 | ||
1001 | for (p = rules; *p; p++) { | |
1002 | if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { | |
1003 | return 1; | |
1004 | } | |
1005 | } | |
1006 | ||
1007 | return 0; | |
1008 | } | |
1009 | ||
e5f38ec3 | 1010 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
1011 | const unsigned char *old_sha1, int mustexist) |
1012 | { | |
8da19775 | 1013 | if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 1014 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
1015 | unlock_ref(lock); |
1016 | return NULL; | |
1017 | } | |
a89fccd2 | 1018 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 1019 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
1020 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
1021 | unlock_ref(lock); | |
1022 | return NULL; | |
1023 | } | |
1024 | return lock; | |
1025 | } | |
1026 | ||
7155b727 | 1027 | static int remove_empty_directories(const char *file) |
bc7127ef JH |
1028 | { |
1029 | /* we want to create a file but there is a directory there; | |
1030 | * if that is an empty directory (or a directory that contains | |
1031 | * only empty directories), remove them. | |
1032 | */ | |
7155b727 JS |
1033 | struct strbuf path; |
1034 | int result; | |
bc7127ef | 1035 | |
7155b727 JS |
1036 | strbuf_init(&path, 20); |
1037 | strbuf_addstr(&path, file); | |
1038 | ||
a0f4afbe | 1039 | result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY); |
7155b727 JS |
1040 | |
1041 | strbuf_release(&path); | |
1042 | ||
1043 | return result; | |
bc7127ef JH |
1044 | } |
1045 | ||
c976d415 LH |
1046 | static int is_refname_available(const char *ref, const char *oldref, |
1047 | struct ref_list *list, int quiet) | |
1048 | { | |
1049 | int namlen = strlen(ref); /* e.g. 'foo/bar' */ | |
1050 | while (list) { | |
1051 | /* list->name could be 'foo' or 'foo/bar/baz' */ | |
1052 | if (!oldref || strcmp(oldref, list->name)) { | |
1053 | int len = strlen(list->name); | |
1054 | int cmplen = (namlen < len) ? namlen : len; | |
1055 | const char *lead = (namlen < len) ? list->name : ref; | |
1056 | if (!strncmp(ref, list->name, cmplen) && | |
1057 | lead[cmplen] == '/') { | |
1058 | if (!quiet) | |
1059 | error("'%s' exists; cannot create '%s'", | |
1060 | list->name, ref); | |
1061 | return 0; | |
1062 | } | |
1063 | } | |
1064 | list = list->next; | |
1065 | } | |
1066 | return 1; | |
1067 | } | |
1068 | ||
ff74f7f1 JH |
1069 | /* |
1070 | * *string and *len will only be substituted, and *string returned (for | |
1071 | * later free()ing) if the string passed in is a magic short-hand form | |
1072 | * to name a branch. | |
1073 | */ | |
1074 | static char *substitute_branch_name(const char **string, int *len) | |
1075 | { | |
1076 | struct strbuf buf = STRBUF_INIT; | |
1077 | int ret = interpret_branch_name(*string, &buf); | |
1078 | ||
1079 | if (ret == *len) { | |
1080 | size_t size; | |
1081 | *string = strbuf_detach(&buf, &size); | |
1082 | *len = size; | |
1083 | return (char *)*string; | |
1084 | } | |
1085 | ||
1086 | return NULL; | |
1087 | } | |
1088 | ||
1089 | int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref) | |
1090 | { | |
1091 | char *last_branch = substitute_branch_name(&str, &len); | |
1092 | const char **p, *r; | |
1093 | int refs_found = 0; | |
1094 | ||
1095 | *ref = NULL; | |
1096 | for (p = ref_rev_parse_rules; *p; p++) { | |
1097 | char fullref[PATH_MAX]; | |
1098 | unsigned char sha1_from_ref[20]; | |
1099 | unsigned char *this_result; | |
1100 | int flag; | |
1101 | ||
1102 | this_result = refs_found ? sha1_from_ref : sha1; | |
1103 | mksnpath(fullref, sizeof(fullref), *p, len, str); | |
1104 | r = resolve_ref(fullref, this_result, 1, &flag); | |
1105 | if (r) { | |
1106 | if (!refs_found++) | |
1107 | *ref = xstrdup(r); | |
1108 | if (!warn_ambiguous_refs) | |
1109 | break; | |
1110 | } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) | |
1111 | warning("ignoring dangling symref %s.", fullref); | |
1112 | } | |
1113 | free(last_branch); | |
1114 | return refs_found; | |
1115 | } | |
1116 | ||
1117 | int dwim_log(const char *str, int len, unsigned char *sha1, char **log) | |
1118 | { | |
1119 | char *last_branch = substitute_branch_name(&str, &len); | |
1120 | const char **p; | |
1121 | int logs_found = 0; | |
1122 | ||
1123 | *log = NULL; | |
1124 | for (p = ref_rev_parse_rules; *p; p++) { | |
1125 | struct stat st; | |
1126 | unsigned char hash[20]; | |
1127 | char path[PATH_MAX]; | |
1128 | const char *ref, *it; | |
1129 | ||
1130 | mksnpath(path, sizeof(path), *p, len, str); | |
1131 | ref = resolve_ref(path, hash, 1, NULL); | |
1132 | if (!ref) | |
1133 | continue; | |
1134 | if (!stat(git_path("logs/%s", path), &st) && | |
1135 | S_ISREG(st.st_mode)) | |
1136 | it = path; | |
1137 | else if (strcmp(ref, path) && | |
1138 | !stat(git_path("logs/%s", ref), &st) && | |
1139 | S_ISREG(st.st_mode)) | |
1140 | it = ref; | |
1141 | else | |
1142 | continue; | |
1143 | if (!logs_found++) { | |
1144 | *log = xstrdup(it); | |
1145 | hashcpy(sha1, hash); | |
1146 | } | |
1147 | if (!warn_ambiguous_refs) | |
1148 | break; | |
1149 | } | |
1150 | free(last_branch); | |
1151 | return logs_found; | |
1152 | } | |
1153 | ||
68db31cc | 1154 | static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p) |
4bd18c43 | 1155 | { |
434cd0cd | 1156 | char *ref_file; |
ed378ec7 | 1157 | const char *orig_ref = ref; |
4bd18c43 | 1158 | struct ref_lock *lock; |
5cc3cef9 | 1159 | int last_errno = 0; |
acd3b9ec | 1160 | int type, lflags; |
4431fcc4 | 1161 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
5bdd8d4a | 1162 | int missing = 0; |
4bd18c43 SP |
1163 | |
1164 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
1165 | lock->lock_fd = -1; | |
1166 | ||
68db31cc | 1167 | ref = resolve_ref(ref, lock->old_sha1, mustexist, &type); |
bc7127ef JH |
1168 | if (!ref && errno == EISDIR) { |
1169 | /* we are trying to lock foo but we used to | |
1170 | * have foo/bar which now does not exist; | |
1171 | * it is normal for the empty directory 'foo' | |
1172 | * to remain. | |
1173 | */ | |
1174 | ref_file = git_path("%s", orig_ref); | |
5cc3cef9 JH |
1175 | if (remove_empty_directories(ref_file)) { |
1176 | last_errno = errno; | |
1177 | error("there are still refs under '%s'", orig_ref); | |
1178 | goto error_return; | |
1179 | } | |
68db31cc | 1180 | ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type); |
bc7127ef | 1181 | } |
68db31cc SV |
1182 | if (type_p) |
1183 | *type_p = type; | |
ed378ec7 | 1184 | if (!ref) { |
5cc3cef9 | 1185 | last_errno = errno; |
818f477c | 1186 | error("unable to resolve reference %s: %s", |
ed378ec7 | 1187 | orig_ref, strerror(errno)); |
5cc3cef9 | 1188 | goto error_return; |
4bd18c43 | 1189 | } |
5bdd8d4a | 1190 | missing = is_null_sha1(lock->old_sha1); |
c976d415 LH |
1191 | /* When the ref did not exist and we are creating it, |
1192 | * make sure there is no existing ref that is packed | |
1193 | * whose name begins with our refname, nor a ref whose | |
1194 | * name is a proper prefix of our refname. | |
1195 | */ | |
5bdd8d4a | 1196 | if (missing && |
0bad611b | 1197 | !is_refname_available(ref, NULL, get_packed_refs(NULL), 0)) { |
f475e08e | 1198 | last_errno = ENOTDIR; |
c976d415 | 1199 | goto error_return; |
f475e08e | 1200 | } |
22a3844e | 1201 | |
c33d5174 | 1202 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 1203 | |
acd3b9ec JH |
1204 | lflags = LOCK_DIE_ON_ERROR; |
1205 | if (flags & REF_NODEREF) { | |
68db31cc | 1206 | ref = orig_ref; |
acd3b9ec JH |
1207 | lflags |= LOCK_NODEREF; |
1208 | } | |
434cd0cd | 1209 | lock->ref_name = xstrdup(ref); |
1655707c | 1210 | lock->orig_ref_name = xstrdup(orig_ref); |
7c1a278d | 1211 | ref_file = git_path("%s", ref); |
5bdd8d4a | 1212 | if (missing) |
68db31cc SV |
1213 | lock->force_write = 1; |
1214 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
1215 | lock->force_write = 1; | |
4bd18c43 | 1216 | |
5cc3cef9 JH |
1217 | if (safe_create_leading_directories(ref_file)) { |
1218 | last_errno = errno; | |
1219 | error("unable to create directory for %s", ref_file); | |
1220 | goto error_return; | |
1221 | } | |
4bd18c43 | 1222 | |
acd3b9ec | 1223 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags); |
4bd18c43 | 1224 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; |
5cc3cef9 JH |
1225 | |
1226 | error_return: | |
1227 | unlock_ref(lock); | |
1228 | errno = last_errno; | |
1229 | return NULL; | |
4bd18c43 SP |
1230 | } |
1231 | ||
4431fcc4 | 1232 | struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1) |
95fc7512 | 1233 | { |
53cce84c | 1234 | char refpath[PATH_MAX]; |
8d9c5010 | 1235 | if (check_refname_format(ref, 0)) |
4bd18c43 | 1236 | return NULL; |
53cce84c | 1237 | strcpy(refpath, mkpath("refs/%s", ref)); |
68db31cc | 1238 | return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL); |
4bd18c43 SP |
1239 | } |
1240 | ||
68db31cc | 1241 | struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags) |
4bd18c43 | 1242 | { |
8d9c5010 | 1243 | if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL)) |
257f3020 | 1244 | return NULL; |
8d9c5010 | 1245 | return lock_ref_sha1_basic(ref, old_sha1, flags, NULL); |
c0277d15 JH |
1246 | } |
1247 | ||
26a063a1 JH |
1248 | static struct lock_file packlock; |
1249 | ||
c0277d15 JH |
1250 | static int repack_without_ref(const char *refname) |
1251 | { | |
1252 | struct ref_list *list, *packed_ref_list; | |
1253 | int fd; | |
1254 | int found = 0; | |
c0277d15 | 1255 | |
0bad611b | 1256 | packed_ref_list = get_packed_refs(NULL); |
c0277d15 JH |
1257 | for (list = packed_ref_list; list; list = list->next) { |
1258 | if (!strcmp(refname, list->name)) { | |
1259 | found = 1; | |
1260 | break; | |
1261 | } | |
1262 | } | |
1263 | if (!found) | |
1264 | return 0; | |
c0277d15 | 1265 | fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0); |
1b018fd9 MV |
1266 | if (fd < 0) { |
1267 | unable_to_lock_error(git_path("packed-refs"), errno); | |
c0277d15 | 1268 | return error("cannot delete '%s' from packed refs", refname); |
1b018fd9 | 1269 | } |
c0277d15 JH |
1270 | |
1271 | for (list = packed_ref_list; list; list = list->next) { | |
1272 | char line[PATH_MAX + 100]; | |
1273 | int len; | |
1274 | ||
1275 | if (!strcmp(refname, list->name)) | |
1276 | continue; | |
1277 | len = snprintf(line, sizeof(line), "%s %s\n", | |
1278 | sha1_to_hex(list->sha1), list->name); | |
1279 | /* this should not happen but just being defensive */ | |
1280 | if (len > sizeof(line)) | |
1281 | die("too long a refname '%s'", list->name); | |
1282 | write_or_die(fd, line, len); | |
1283 | } | |
1284 | return commit_lock_file(&packlock); | |
1285 | } | |
1286 | ||
eca35a25 | 1287 | int delete_ref(const char *refname, const unsigned char *sha1, int delopt) |
c0277d15 JH |
1288 | { |
1289 | struct ref_lock *lock; | |
eca35a25 | 1290 | int err, i = 0, ret = 0, flag = 0; |
c0277d15 | 1291 | |
68db31cc | 1292 | lock = lock_ref_sha1_basic(refname, sha1, 0, &flag); |
c0277d15 JH |
1293 | if (!lock) |
1294 | return 1; | |
045a476f | 1295 | if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) { |
c0277d15 | 1296 | /* loose */ |
eca35a25 MV |
1297 | const char *path; |
1298 | ||
1299 | if (!(delopt & REF_NODEREF)) { | |
1300 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
1301 | lock->lk->filename[i] = 0; | |
1302 | path = lock->lk->filename; | |
1303 | } else { | |
9db56f71 | 1304 | path = git_path("%s", refname); |
eca35a25 | 1305 | } |
691f1a28 AR |
1306 | err = unlink_or_warn(path); |
1307 | if (err && errno != ENOENT) | |
c0277d15 | 1308 | ret = 1; |
691f1a28 | 1309 | |
eca35a25 MV |
1310 | if (!(delopt & REF_NODEREF)) |
1311 | lock->lk->filename[i] = '.'; | |
c0277d15 JH |
1312 | } |
1313 | /* removing the loose one could have resurrected an earlier | |
1314 | * packed one. Also, if it was not loose we need to repack | |
1315 | * without it. | |
1316 | */ | |
1317 | ret |= repack_without_ref(refname); | |
1318 | ||
691f1a28 | 1319 | unlink_or_warn(git_path("logs/%s", lock->ref_name)); |
c0277d15 JH |
1320 | invalidate_cached_refs(); |
1321 | unlock_ref(lock); | |
1322 | return ret; | |
4bd18c43 SP |
1323 | } |
1324 | ||
765c2258 PH |
1325 | /* |
1326 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
1327 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
1328 | * | |
1329 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
1330 | * live into logs/refs. | |
1331 | */ | |
1332 | #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log" | |
1333 | ||
678d0f4c | 1334 | int rename_ref(const char *oldref, const char *newref, const char *logmsg) |
c976d415 LH |
1335 | { |
1336 | static const char renamed_ref[] = "RENAMED-REF"; | |
1337 | unsigned char sha1[20], orig_sha1[20]; | |
1338 | int flag = 0, logmoved = 0; | |
1339 | struct ref_lock *lock; | |
c976d415 | 1340 | struct stat loginfo; |
16c2bfbb | 1341 | int log = !lstat(git_path("logs/%s", oldref), &loginfo); |
eca35a25 | 1342 | const char *symref = NULL; |
c976d415 | 1343 | |
450d4c0f | 1344 | if (log && S_ISLNK(loginfo.st_mode)) |
c976d415 LH |
1345 | return error("reflog for %s is a symlink", oldref); |
1346 | ||
eca35a25 MV |
1347 | symref = resolve_ref(oldref, orig_sha1, 1, &flag); |
1348 | if (flag & REF_ISSYMREF) | |
fa58186c MV |
1349 | return error("refname %s is a symbolic ref, renaming it is not supported", |
1350 | oldref); | |
eca35a25 | 1351 | if (!symref) |
c976d415 LH |
1352 | return error("refname %s not found", oldref); |
1353 | ||
0bad611b | 1354 | if (!is_refname_available(newref, oldref, get_packed_refs(NULL), 0)) |
c976d415 LH |
1355 | return 1; |
1356 | ||
0bad611b | 1357 | if (!is_refname_available(newref, oldref, get_loose_refs(NULL), 0)) |
c976d415 LH |
1358 | return 1; |
1359 | ||
68db31cc | 1360 | lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL); |
c976d415 LH |
1361 | if (!lock) |
1362 | return error("unable to lock %s", renamed_ref); | |
1363 | lock->force_write = 1; | |
678d0f4c | 1364 | if (write_ref_sha1(lock, orig_sha1, logmsg)) |
c976d415 LH |
1365 | return error("unable to save current sha1 in %s", renamed_ref); |
1366 | ||
765c2258 PH |
1367 | if (log && rename(git_path("logs/%s", oldref), git_path(TMP_RENAMED_LOG))) |
1368 | return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s", | |
c976d415 LH |
1369 | oldref, strerror(errno)); |
1370 | ||
eca35a25 | 1371 | if (delete_ref(oldref, orig_sha1, REF_NODEREF)) { |
c976d415 LH |
1372 | error("unable to delete old %s", oldref); |
1373 | goto rollback; | |
1374 | } | |
1375 | ||
eca35a25 | 1376 | if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1, REF_NODEREF)) { |
c976d415 LH |
1377 | if (errno==EISDIR) { |
1378 | if (remove_empty_directories(git_path("%s", newref))) { | |
1379 | error("Directory not empty: %s", newref); | |
1380 | goto rollback; | |
1381 | } | |
1382 | } else { | |
1383 | error("unable to delete existing %s", newref); | |
1384 | goto rollback; | |
1385 | } | |
1386 | } | |
1387 | ||
1388 | if (log && safe_create_leading_directories(git_path("logs/%s", newref))) { | |
1389 | error("unable to create directory for %s", newref); | |
1390 | goto rollback; | |
1391 | } | |
1392 | ||
1393 | retry: | |
765c2258 | 1394 | if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newref))) { |
d9e74d57 JR |
1395 | if (errno==EISDIR || errno==ENOTDIR) { |
1396 | /* | |
1397 | * rename(a, b) when b is an existing | |
1398 | * directory ought to result in ISDIR, but | |
1399 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
1400 | */ | |
c976d415 LH |
1401 | if (remove_empty_directories(git_path("logs/%s", newref))) { |
1402 | error("Directory not empty: logs/%s", newref); | |
1403 | goto rollback; | |
1404 | } | |
1405 | goto retry; | |
1406 | } else { | |
765c2258 | 1407 | error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s", |
c976d415 LH |
1408 | newref, strerror(errno)); |
1409 | goto rollback; | |
1410 | } | |
1411 | } | |
1412 | logmoved = log; | |
1413 | ||
68db31cc | 1414 | lock = lock_ref_sha1_basic(newref, NULL, 0, NULL); |
c976d415 LH |
1415 | if (!lock) { |
1416 | error("unable to lock %s for update", newref); | |
1417 | goto rollback; | |
1418 | } | |
c976d415 LH |
1419 | lock->force_write = 1; |
1420 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 1421 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
c976d415 LH |
1422 | error("unable to write current sha1 into %s", newref); |
1423 | goto rollback; | |
1424 | } | |
1425 | ||
1426 | return 0; | |
1427 | ||
1428 | rollback: | |
68db31cc | 1429 | lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL); |
c976d415 LH |
1430 | if (!lock) { |
1431 | error("unable to lock %s for rollback", oldref); | |
1432 | goto rollbacklog; | |
1433 | } | |
1434 | ||
1435 | lock->force_write = 1; | |
1436 | flag = log_all_ref_updates; | |
1437 | log_all_ref_updates = 0; | |
1438 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
1439 | error("unable to write current sha1 into %s", oldref); | |
1440 | log_all_ref_updates = flag; | |
1441 | ||
1442 | rollbacklog: | |
1443 | if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref))) | |
1444 | error("unable to restore logfile %s from %s: %s", | |
1445 | oldref, newref, strerror(errno)); | |
1446 | if (!logmoved && log && | |
765c2258 PH |
1447 | rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldref))) |
1448 | error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s", | |
c976d415 LH |
1449 | oldref, strerror(errno)); |
1450 | ||
1451 | return 1; | |
1452 | } | |
1453 | ||
435fc852 | 1454 | int close_ref(struct ref_lock *lock) |
b531394d BC |
1455 | { |
1456 | if (close_lock_file(lock->lk)) | |
1457 | return -1; | |
1458 | lock->lock_fd = -1; | |
1459 | return 0; | |
1460 | } | |
1461 | ||
435fc852 | 1462 | int commit_ref(struct ref_lock *lock) |
b531394d BC |
1463 | { |
1464 | if (commit_lock_file(lock->lk)) | |
1465 | return -1; | |
1466 | lock->lock_fd = -1; | |
1467 | return 0; | |
1468 | } | |
1469 | ||
e5f38ec3 | 1470 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 | 1471 | { |
4ed7cd3a BC |
1472 | /* Do not free lock->lk -- atexit() still looks at them */ |
1473 | if (lock->lk) | |
1474 | rollback_lock_file(lock->lk); | |
434cd0cd | 1475 | free(lock->ref_name); |
1655707c | 1476 | free(lock->orig_ref_name); |
4bd18c43 SP |
1477 | free(lock); |
1478 | } | |
1479 | ||
0ec29a47 JH |
1480 | /* |
1481 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
1482 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
1483 | * because reflog file is one line per entry. | |
1484 | */ | |
1485 | static int copy_msg(char *buf, const char *msg) | |
1486 | { | |
1487 | char *cp = buf; | |
1488 | char c; | |
1489 | int wasspace = 1; | |
1490 | ||
1491 | *cp++ = '\t'; | |
1492 | while ((c = *msg++)) { | |
1493 | if (wasspace && isspace(c)) | |
1494 | continue; | |
1495 | wasspace = isspace(c); | |
1496 | if (wasspace) | |
1497 | c = ' '; | |
1498 | *cp++ = c; | |
1499 | } | |
1500 | while (buf < cp && isspace(cp[-1])) | |
1501 | cp--; | |
1502 | *cp++ = '\n'; | |
1503 | return cp - buf; | |
1504 | } | |
1505 | ||
157aaea5 | 1506 | int log_ref_setup(const char *ref_name, char *logfile, int bufsize) |
6de08ae6 | 1507 | { |
859c3017 | 1508 | int logfd, oflags = O_APPEND | O_WRONLY; |
9a13f0b7 | 1509 | |
157aaea5 | 1510 | git_snpath(logfile, bufsize, "logs/%s", ref_name); |
4057deb5 | 1511 | if (log_all_ref_updates && |
cc44c765 JH |
1512 | (!prefixcmp(ref_name, "refs/heads/") || |
1513 | !prefixcmp(ref_name, "refs/remotes/") || | |
b2e256b0 | 1514 | !prefixcmp(ref_name, "refs/notes/") || |
bd104db1 | 1515 | !strcmp(ref_name, "HEAD"))) { |
157aaea5 | 1516 | if (safe_create_leading_directories(logfile) < 0) |
6de08ae6 | 1517 | return error("unable to create directory for %s", |
157aaea5 | 1518 | logfile); |
6de08ae6 SP |
1519 | oflags |= O_CREAT; |
1520 | } | |
1521 | ||
157aaea5 | 1522 | logfd = open(logfile, oflags, 0666); |
6de08ae6 | 1523 | if (logfd < 0) { |
1974bf62 | 1524 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 1525 | return 0; |
3b463c3f JH |
1526 | |
1527 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
157aaea5 | 1528 | if (remove_empty_directories(logfile)) { |
3b463c3f | 1529 | return error("There are still logs under '%s'", |
157aaea5 | 1530 | logfile); |
3b463c3f | 1531 | } |
157aaea5 | 1532 | logfd = open(logfile, oflags, 0666); |
3b463c3f JH |
1533 | } |
1534 | ||
1535 | if (logfd < 0) | |
1536 | return error("Unable to append to %s: %s", | |
157aaea5 | 1537 | logfile, strerror(errno)); |
6de08ae6 SP |
1538 | } |
1539 | ||
157aaea5 | 1540 | adjust_shared_perm(logfile); |
859c3017 EM |
1541 | close(logfd); |
1542 | return 0; | |
1543 | } | |
443b92b6 | 1544 | |
859c3017 EM |
1545 | static int log_ref_write(const char *ref_name, const unsigned char *old_sha1, |
1546 | const unsigned char *new_sha1, const char *msg) | |
1547 | { | |
1548 | int logfd, result, written, oflags = O_APPEND | O_WRONLY; | |
1549 | unsigned maxlen, len; | |
1550 | int msglen; | |
157aaea5 | 1551 | char log_file[PATH_MAX]; |
859c3017 EM |
1552 | char *logrec; |
1553 | const char *committer; | |
1554 | ||
1555 | if (log_all_ref_updates < 0) | |
1556 | log_all_ref_updates = !is_bare_repository(); | |
1557 | ||
157aaea5 | 1558 | result = log_ref_setup(ref_name, log_file, sizeof(log_file)); |
859c3017 EM |
1559 | if (result) |
1560 | return result; | |
1561 | ||
1562 | logfd = open(log_file, oflags); | |
1563 | if (logfd < 0) | |
1564 | return 0; | |
0ec29a47 | 1565 | msglen = msg ? strlen(msg) : 0; |
774751a8 | 1566 | committer = git_committer_info(0); |
8ac65937 JH |
1567 | maxlen = strlen(committer) + msglen + 100; |
1568 | logrec = xmalloc(maxlen); | |
1569 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
1570 | sha1_to_hex(old_sha1), |
1571 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
1572 | committer); |
1573 | if (msglen) | |
0ec29a47 | 1574 | len += copy_msg(logrec + len - 1, msg) - 1; |
93822c22 | 1575 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 | 1576 | free(logrec); |
91c8d590 | 1577 | if (close(logfd) != 0 || written != len) |
9a13f0b7 | 1578 | return error("Unable to append to %s", log_file); |
6de08ae6 SP |
1579 | return 0; |
1580 | } | |
1581 | ||
c3b0dec5 LT |
1582 | static int is_branch(const char *refname) |
1583 | { | |
1584 | return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/"); | |
1585 | } | |
1586 | ||
4bd18c43 SP |
1587 | int write_ref_sha1(struct ref_lock *lock, |
1588 | const unsigned char *sha1, const char *logmsg) | |
1589 | { | |
1590 | static char term = '\n'; | |
c3b0dec5 | 1591 | struct object *o; |
4bd18c43 SP |
1592 | |
1593 | if (!lock) | |
95fc7512 | 1594 | return -1; |
a89fccd2 | 1595 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
1596 | unlock_ref(lock); |
1597 | return 0; | |
95fc7512 | 1598 | } |
c3b0dec5 LT |
1599 | o = parse_object(sha1); |
1600 | if (!o) { | |
7be8b3ba | 1601 | error("Trying to write ref %s with nonexistent object %s", |
c3b0dec5 LT |
1602 | lock->ref_name, sha1_to_hex(sha1)); |
1603 | unlock_ref(lock); | |
1604 | return -1; | |
1605 | } | |
1606 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1607 | error("Trying to write non-commit object %s to branch %s", | |
1608 | sha1_to_hex(sha1), lock->ref_name); | |
1609 | unlock_ref(lock); | |
1610 | return -1; | |
1611 | } | |
93822c22 AW |
1612 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
1613 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
b531394d | 1614 | || close_ref(lock) < 0) { |
c33d5174 | 1615 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
1616 | unlock_ref(lock); |
1617 | return -1; | |
1618 | } | |
5e290ff7 | 1619 | invalidate_cached_refs(); |
bd104db1 NP |
1620 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
1621 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
1622 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
1623 | unlock_ref(lock); |
1624 | return -1; | |
1625 | } | |
605fac8b NP |
1626 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
1627 | /* | |
1628 | * Special hack: If a branch is updated directly and HEAD | |
1629 | * points to it (may happen on the remote side of a push | |
1630 | * for example) then logically the HEAD reflog should be | |
1631 | * updated too. | |
1632 | * A generic solution implies reverse symref information, | |
1633 | * but finding all symrefs pointing to the given branch | |
1634 | * would be rather costly for this rare event (the direct | |
1635 | * update of a branch) to be worth it. So let's cheat and | |
1636 | * check with HEAD only which should cover 99% of all usage | |
1637 | * scenarios (even 100% of the default ones). | |
1638 | */ | |
1639 | unsigned char head_sha1[20]; | |
1640 | int head_flag; | |
1641 | const char *head_ref; | |
1642 | head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag); | |
1643 | if (head_ref && (head_flag & REF_ISSYMREF) && | |
1644 | !strcmp(head_ref, lock->ref_name)) | |
1645 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
1646 | } | |
b531394d | 1647 | if (commit_ref(lock)) { |
434cd0cd | 1648 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
1649 | unlock_ref(lock); |
1650 | return -1; | |
1651 | } | |
4bd18c43 SP |
1652 | unlock_ref(lock); |
1653 | return 0; | |
95fc7512 | 1654 | } |
d556fae2 | 1655 | |
8b5157e4 NP |
1656 | int create_symref(const char *ref_target, const char *refs_heads_master, |
1657 | const char *logmsg) | |
41b625b0 NP |
1658 | { |
1659 | const char *lockpath; | |
1660 | char ref[1000]; | |
1661 | int fd, len, written; | |
a4f34cbb | 1662 | char *git_HEAD = git_pathdup("%s", ref_target); |
8b5157e4 NP |
1663 | unsigned char old_sha1[20], new_sha1[20]; |
1664 | ||
1665 | if (logmsg && read_ref(ref_target, old_sha1)) | |
1666 | hashclr(old_sha1); | |
41b625b0 | 1667 | |
d48744d1 JH |
1668 | if (safe_create_leading_directories(git_HEAD) < 0) |
1669 | return error("unable to create directory for %s", git_HEAD); | |
1670 | ||
41b625b0 NP |
1671 | #ifndef NO_SYMLINK_HEAD |
1672 | if (prefer_symlink_refs) { | |
1673 | unlink(git_HEAD); | |
1674 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 1675 | goto done; |
41b625b0 NP |
1676 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
1677 | } | |
1678 | #endif | |
1679 | ||
1680 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
1681 | if (sizeof(ref) <= len) { | |
1682 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 1683 | goto error_free_return; |
41b625b0 NP |
1684 | } |
1685 | lockpath = mkpath("%s.lock", git_HEAD); | |
1686 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
1687 | if (fd < 0) { | |
1688 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 1689 | goto error_free_return; |
41b625b0 NP |
1690 | } |
1691 | written = write_in_full(fd, ref, len); | |
91c8d590 | 1692 | if (close(fd) != 0 || written != len) { |
41b625b0 | 1693 | error("Unable to write to %s", lockpath); |
47fc52e2 | 1694 | goto error_unlink_return; |
41b625b0 NP |
1695 | } |
1696 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 1697 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 1698 | goto error_unlink_return; |
41b625b0 NP |
1699 | } |
1700 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 1701 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 | 1702 | error_unlink_return: |
691f1a28 | 1703 | unlink_or_warn(lockpath); |
47fc52e2 JH |
1704 | error_free_return: |
1705 | free(git_HEAD); | |
1706 | return -1; | |
41b625b0 | 1707 | } |
8b5157e4 | 1708 | |
ee96d11b | 1709 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 1710 | done: |
ee96d11b | 1711 | #endif |
8b5157e4 NP |
1712 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
1713 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
1714 | ||
47fc52e2 | 1715 | free(git_HEAD); |
41b625b0 NP |
1716 | return 0; |
1717 | } | |
1718 | ||
16d7cc90 JH |
1719 | static char *ref_msg(const char *line, const char *endp) |
1720 | { | |
1721 | const char *ep; | |
16d7cc90 | 1722 | line += 82; |
182af834 PH |
1723 | ep = memchr(line, '\n', endp - line); |
1724 | if (!ep) | |
1725 | ep = endp; | |
1726 | return xmemdupz(line, ep - line); | |
16d7cc90 JH |
1727 | } |
1728 | ||
1729 | int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *sha1, char **msg, unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt) | |
d556fae2 | 1730 | { |
e5229042 | 1731 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 | 1732 | char *tz_c; |
e29cb53a | 1733 | int logfd, tz, reccnt = 0; |
d556fae2 SP |
1734 | struct stat st; |
1735 | unsigned long date; | |
e5229042 | 1736 | unsigned char logged_sha1[20]; |
cb48cb58 | 1737 | void *log_mapped; |
dc49cd76 | 1738 | size_t mapsz; |
d556fae2 SP |
1739 | |
1740 | logfile = git_path("logs/%s", ref); | |
1741 | logfd = open(logfile, O_RDONLY, 0); | |
1742 | if (logfd < 0) | |
d824cbba | 1743 | die_errno("Unable to read log '%s'", logfile); |
d556fae2 SP |
1744 | fstat(logfd, &st); |
1745 | if (!st.st_size) | |
1746 | die("Log %s is empty.", logfile); | |
dc49cd76 SP |
1747 | mapsz = xsize_t(st.st_size); |
1748 | log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0); | |
cb48cb58 | 1749 | logdata = log_mapped; |
d556fae2 SP |
1750 | close(logfd); |
1751 | ||
e5229042 | 1752 | lastrec = NULL; |
d556fae2 SP |
1753 | rec = logend = logdata + st.st_size; |
1754 | while (logdata < rec) { | |
e29cb53a | 1755 | reccnt++; |
d556fae2 SP |
1756 | if (logdata < rec && *(rec-1) == '\n') |
1757 | rec--; | |
e5229042 SP |
1758 | lastgt = NULL; |
1759 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 1760 | rec--; |
e5229042 SP |
1761 | if (*rec == '>') |
1762 | lastgt = rec; | |
1763 | } | |
1764 | if (!lastgt) | |
d556fae2 | 1765 | die("Log %s is corrupt.", logfile); |
e5229042 | 1766 | date = strtoul(lastgt + 1, &tz_c, 10); |
ab2a1a32 | 1767 | if (date <= at_time || cnt == 0) { |
76a44c5c | 1768 | tz = strtoul(tz_c, NULL, 10); |
16d7cc90 JH |
1769 | if (msg) |
1770 | *msg = ref_msg(rec, logend); | |
1771 | if (cutoff_time) | |
1772 | *cutoff_time = date; | |
1773 | if (cutoff_tz) | |
1774 | *cutoff_tz = tz; | |
1775 | if (cutoff_cnt) | |
76a44c5c | 1776 | *cutoff_cnt = reccnt - 1; |
e5229042 SP |
1777 | if (lastrec) { |
1778 | if (get_sha1_hex(lastrec, logged_sha1)) | |
1779 | die("Log %s is corrupt.", logfile); | |
1780 | if (get_sha1_hex(rec + 41, sha1)) | |
1781 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1782 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1783 | warning("Log %s has gap after %s.", |
73013afd | 1784 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 | 1785 | } |
e5f38ec3 JH |
1786 | } |
1787 | else if (date == at_time) { | |
e5229042 SP |
1788 | if (get_sha1_hex(rec + 41, sha1)) |
1789 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
1790 | } |
1791 | else { | |
e5229042 SP |
1792 | if (get_sha1_hex(rec + 41, logged_sha1)) |
1793 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1794 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1795 | warning("Log %s unexpectedly ended on %s.", |
73013afd | 1796 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 SP |
1797 | } |
1798 | } | |
dc49cd76 | 1799 | munmap(log_mapped, mapsz); |
d556fae2 SP |
1800 | return 0; |
1801 | } | |
e5229042 | 1802 | lastrec = rec; |
ab2a1a32 JH |
1803 | if (cnt > 0) |
1804 | cnt--; | |
d556fae2 SP |
1805 | } |
1806 | ||
e5229042 SP |
1807 | rec = logdata; |
1808 | while (rec < logend && *rec != '>' && *rec != '\n') | |
1809 | rec++; | |
1810 | if (rec == logend || *rec == '\n') | |
d556fae2 | 1811 | die("Log %s is corrupt.", logfile); |
e5229042 | 1812 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
1813 | tz = strtoul(tz_c, NULL, 10); |
1814 | if (get_sha1_hex(logdata, sha1)) | |
1815 | die("Log %s is corrupt.", logfile); | |
d1a4489a JK |
1816 | if (is_null_sha1(sha1)) { |
1817 | if (get_sha1_hex(logdata + 41, sha1)) | |
1818 | die("Log %s is corrupt.", logfile); | |
1819 | } | |
16d7cc90 JH |
1820 | if (msg) |
1821 | *msg = ref_msg(logdata, logend); | |
dc49cd76 | 1822 | munmap(log_mapped, mapsz); |
16d7cc90 JH |
1823 | |
1824 | if (cutoff_time) | |
1825 | *cutoff_time = date; | |
1826 | if (cutoff_tz) | |
1827 | *cutoff_tz = tz; | |
1828 | if (cutoff_cnt) | |
1829 | *cutoff_cnt = reccnt; | |
1830 | return 1; | |
d556fae2 | 1831 | } |
2ff81662 | 1832 | |
101d15e0 | 1833 | int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long ofs, void *cb_data) |
2ff81662 JH |
1834 | { |
1835 | const char *logfile; | |
1836 | FILE *logfp; | |
8ca78803 | 1837 | struct strbuf sb = STRBUF_INIT; |
2266bf27 | 1838 | int ret = 0; |
2ff81662 JH |
1839 | |
1840 | logfile = git_path("logs/%s", ref); | |
1841 | logfp = fopen(logfile, "r"); | |
1842 | if (!logfp) | |
883d60fa | 1843 | return -1; |
101d15e0 JH |
1844 | |
1845 | if (ofs) { | |
1846 | struct stat statbuf; | |
1847 | if (fstat(fileno(logfp), &statbuf) || | |
1848 | statbuf.st_size < ofs || | |
1849 | fseek(logfp, -ofs, SEEK_END) || | |
8ca78803 | 1850 | strbuf_getwholeline(&sb, logfp, '\n')) { |
9d33f7c2 | 1851 | fclose(logfp); |
8ca78803 | 1852 | strbuf_release(&sb); |
101d15e0 | 1853 | return -1; |
9d33f7c2 | 1854 | } |
101d15e0 JH |
1855 | } |
1856 | ||
8ca78803 | 1857 | while (!strbuf_getwholeline(&sb, logfp, '\n')) { |
2ff81662 | 1858 | unsigned char osha1[20], nsha1[20]; |
883d60fa JS |
1859 | char *email_end, *message; |
1860 | unsigned long timestamp; | |
8ca78803 | 1861 | int tz; |
2ff81662 JH |
1862 | |
1863 | /* old SP new SP name <email> SP time TAB msg LF */ | |
8ca78803 RS |
1864 | if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' || |
1865 | get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' || | |
1866 | get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' || | |
1867 | !(email_end = strchr(sb.buf + 82, '>')) || | |
883d60fa JS |
1868 | email_end[1] != ' ' || |
1869 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
1870 | !message || message[0] != ' ' || | |
1871 | (message[1] != '+' && message[1] != '-') || | |
1872 | !isdigit(message[2]) || !isdigit(message[3]) || | |
b4dd4856 | 1873 | !isdigit(message[4]) || !isdigit(message[5])) |
2ff81662 | 1874 | continue; /* corrupt? */ |
883d60fa JS |
1875 | email_end[1] = '\0'; |
1876 | tz = strtol(message + 1, NULL, 10); | |
b4dd4856 JS |
1877 | if (message[6] != '\t') |
1878 | message += 6; | |
1879 | else | |
1880 | message += 7; | |
8ca78803 RS |
1881 | ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message, |
1882 | cb_data); | |
883d60fa | 1883 | if (ret) |
2266bf27 | 1884 | break; |
2ff81662 JH |
1885 | } |
1886 | fclose(logfp); | |
8ca78803 | 1887 | strbuf_release(&sb); |
2266bf27 | 1888 | return ret; |
2ff81662 | 1889 | } |
e29cb53a | 1890 | |
101d15e0 JH |
1891 | int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data) |
1892 | { | |
1893 | return for_each_recent_reflog_ent(ref, fn, 0, cb_data); | |
1894 | } | |
1895 | ||
eb8381c8 NP |
1896 | static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data) |
1897 | { | |
1898 | DIR *dir = opendir(git_path("logs/%s", base)); | |
fcee5a14 | 1899 | int retval = 0; |
eb8381c8 NP |
1900 | |
1901 | if (dir) { | |
1902 | struct dirent *de; | |
1903 | int baselen = strlen(base); | |
1904 | char *log = xmalloc(baselen + 257); | |
1905 | ||
1906 | memcpy(log, base, baselen); | |
1907 | if (baselen && base[baselen-1] != '/') | |
1908 | log[baselen++] = '/'; | |
1909 | ||
1910 | while ((de = readdir(dir)) != NULL) { | |
1911 | struct stat st; | |
1912 | int namelen; | |
1913 | ||
1914 | if (de->d_name[0] == '.') | |
1915 | continue; | |
1916 | namelen = strlen(de->d_name); | |
1917 | if (namelen > 255) | |
1918 | continue; | |
1919 | if (has_extension(de->d_name, ".lock")) | |
1920 | continue; | |
1921 | memcpy(log + baselen, de->d_name, namelen+1); | |
1922 | if (stat(git_path("logs/%s", log), &st) < 0) | |
1923 | continue; | |
1924 | if (S_ISDIR(st.st_mode)) { | |
1925 | retval = do_for_each_reflog(log, fn, cb_data); | |
1926 | } else { | |
1927 | unsigned char sha1[20]; | |
1928 | if (!resolve_ref(log, sha1, 0, NULL)) | |
1929 | retval = error("bad ref for %s", log); | |
1930 | else | |
1931 | retval = fn(log, sha1, 0, cb_data); | |
1932 | } | |
1933 | if (retval) | |
1934 | break; | |
1935 | } | |
1936 | free(log); | |
1937 | closedir(dir); | |
1938 | } | |
acb39f64 | 1939 | else if (*base) |
fcee5a14 | 1940 | return errno; |
eb8381c8 NP |
1941 | return retval; |
1942 | } | |
1943 | ||
1944 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
1945 | { | |
1946 | return do_for_each_reflog("", fn, cb_data); | |
1947 | } | |
3d9f037c CR |
1948 | |
1949 | int update_ref(const char *action, const char *refname, | |
1950 | const unsigned char *sha1, const unsigned char *oldval, | |
1951 | int flags, enum action_on_err onerr) | |
1952 | { | |
1953 | static struct ref_lock *lock; | |
1954 | lock = lock_any_ref_for_update(refname, oldval, flags); | |
1955 | if (!lock) { | |
1956 | const char *str = "Cannot lock the ref '%s'."; | |
1957 | switch (onerr) { | |
1958 | case MSG_ON_ERR: error(str, refname); break; | |
1959 | case DIE_ON_ERR: die(str, refname); break; | |
1960 | case QUIET_ON_ERR: break; | |
1961 | } | |
1962 | return 1; | |
1963 | } | |
1964 | if (write_ref_sha1(lock, sha1, action) < 0) { | |
1965 | const char *str = "Cannot update the ref '%s'."; | |
1966 | switch (onerr) { | |
1967 | case MSG_ON_ERR: error(str, refname); break; | |
1968 | case DIE_ON_ERR: die(str, refname); break; | |
1969 | case QUIET_ON_ERR: break; | |
1970 | } | |
1971 | return 1; | |
1972 | } | |
1973 | return 0; | |
1974 | } | |
cda69f48 | 1975 | |
c17b2294 JH |
1976 | int ref_exists(char *refname) |
1977 | { | |
1978 | unsigned char sha1[20]; | |
1979 | return !!resolve_ref(refname, sha1, 1, NULL); | |
1980 | } | |
1981 | ||
5483f799 | 1982 | struct ref *find_ref_by_name(const struct ref *list, const char *name) |
cda69f48 JK |
1983 | { |
1984 | for ( ; list; list = list->next) | |
1985 | if (!strcmp(list->name, name)) | |
5483f799 | 1986 | return (struct ref *)list; |
cda69f48 JK |
1987 | return NULL; |
1988 | } | |
7c2b3029 JK |
1989 | |
1990 | /* | |
1991 | * generate a format suitable for scanf from a ref_rev_parse_rules | |
1992 | * rule, that is replace the "%.*s" spec with a "%s" spec | |
1993 | */ | |
1994 | static void gen_scanf_fmt(char *scanf_fmt, const char *rule) | |
1995 | { | |
1996 | char *spec; | |
1997 | ||
1998 | spec = strstr(rule, "%.*s"); | |
1999 | if (!spec || strstr(spec + 4, "%.*s")) | |
2000 | die("invalid rule in ref_rev_parse_rules: %s", rule); | |
2001 | ||
2002 | /* copy all until spec */ | |
2003 | strncpy(scanf_fmt, rule, spec - rule); | |
2004 | scanf_fmt[spec - rule] = '\0'; | |
2005 | /* copy new spec */ | |
2006 | strcat(scanf_fmt, "%s"); | |
2007 | /* copy remaining rule */ | |
2008 | strcat(scanf_fmt, spec + 4); | |
2009 | ||
2010 | return; | |
2011 | } | |
2012 | ||
6e7b3309 | 2013 | char *shorten_unambiguous_ref(const char *ref, int strict) |
7c2b3029 JK |
2014 | { |
2015 | int i; | |
2016 | static char **scanf_fmts; | |
2017 | static int nr_rules; | |
2018 | char *short_name; | |
2019 | ||
2020 | /* pre generate scanf formats from ref_rev_parse_rules[] */ | |
2021 | if (!nr_rules) { | |
2022 | size_t total_len = 0; | |
2023 | ||
2024 | /* the rule list is NULL terminated, count them first */ | |
2025 | for (; ref_rev_parse_rules[nr_rules]; nr_rules++) | |
2026 | /* no +1 because strlen("%s") < strlen("%.*s") */ | |
2027 | total_len += strlen(ref_rev_parse_rules[nr_rules]); | |
2028 | ||
2029 | scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len); | |
2030 | ||
2031 | total_len = 0; | |
2032 | for (i = 0; i < nr_rules; i++) { | |
2033 | scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] | |
2034 | + total_len; | |
2035 | gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]); | |
2036 | total_len += strlen(ref_rev_parse_rules[i]); | |
2037 | } | |
2038 | } | |
2039 | ||
2040 | /* bail out if there are no rules */ | |
2041 | if (!nr_rules) | |
2042 | return xstrdup(ref); | |
2043 | ||
2044 | /* buffer for scanf result, at most ref must fit */ | |
2045 | short_name = xstrdup(ref); | |
2046 | ||
2047 | /* skip first rule, it will always match */ | |
2048 | for (i = nr_rules - 1; i > 0 ; --i) { | |
2049 | int j; | |
6e7b3309 | 2050 | int rules_to_fail = i; |
7c2b3029 JK |
2051 | int short_name_len; |
2052 | ||
2053 | if (1 != sscanf(ref, scanf_fmts[i], short_name)) | |
2054 | continue; | |
2055 | ||
2056 | short_name_len = strlen(short_name); | |
2057 | ||
6e7b3309 BW |
2058 | /* |
2059 | * in strict mode, all (except the matched one) rules | |
2060 | * must fail to resolve to a valid non-ambiguous ref | |
2061 | */ | |
2062 | if (strict) | |
2063 | rules_to_fail = nr_rules; | |
2064 | ||
7c2b3029 JK |
2065 | /* |
2066 | * check if the short name resolves to a valid ref, | |
2067 | * but use only rules prior to the matched one | |
2068 | */ | |
6e7b3309 | 2069 | for (j = 0; j < rules_to_fail; j++) { |
7c2b3029 JK |
2070 | const char *rule = ref_rev_parse_rules[j]; |
2071 | unsigned char short_objectname[20]; | |
2072 | char refname[PATH_MAX]; | |
2073 | ||
6e7b3309 BW |
2074 | /* skip matched rule */ |
2075 | if (i == j) | |
2076 | continue; | |
2077 | ||
7c2b3029 JK |
2078 | /* |
2079 | * the short name is ambiguous, if it resolves | |
2080 | * (with this previous rule) to a valid ref | |
2081 | * read_ref() returns 0 on success | |
2082 | */ | |
2083 | mksnpath(refname, sizeof(refname), | |
2084 | rule, short_name_len, short_name); | |
2085 | if (!read_ref(refname, short_objectname)) | |
2086 | break; | |
2087 | } | |
2088 | ||
2089 | /* | |
2090 | * short name is non-ambiguous if all previous rules | |
2091 | * haven't resolved to a valid ref | |
2092 | */ | |
6e7b3309 | 2093 | if (j == rules_to_fail) |
7c2b3029 JK |
2094 | return short_name; |
2095 | } | |
2096 | ||
2097 | free(short_name); | |
2098 | return xstrdup(ref); | |
2099 | } |