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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 | |
f4204ab9 JH |
7 | /* ISSYMREF=01 and ISPACKED=02 are public interfaces */ |
8 | #define REF_KNOWS_PEELED 04 | |
e01de1c9 | 9 | #define REF_BROKEN 010 |
f4204ab9 | 10 | |
e1e22e37 LT |
11 | struct ref_list { |
12 | struct ref_list *next; | |
f4204ab9 | 13 | unsigned char flag; /* ISSYMREF? ISPACKED? */ |
e1e22e37 | 14 | unsigned char sha1[20]; |
f4204ab9 | 15 | unsigned char peeled[20]; |
e1e22e37 LT |
16 | char name[FLEX_ARRAY]; |
17 | }; | |
18 | ||
f4204ab9 | 19 | static const char *parse_ref_line(char *line, unsigned char *sha1) |
e1e22e37 LT |
20 | { |
21 | /* | |
22 | * 42: the answer to everything. | |
23 | * | |
24 | * In this case, it happens to be the answer to | |
25 | * 40 (length of sha1 hex representation) | |
26 | * +1 (space in between hex and name) | |
27 | * +1 (newline at the end of the line) | |
28 | */ | |
29 | int len = strlen(line) - 42; | |
30 | ||
31 | if (len <= 0) | |
32 | return NULL; | |
33 | if (get_sha1_hex(line, sha1) < 0) | |
34 | return NULL; | |
35 | if (!isspace(line[40])) | |
36 | return NULL; | |
37 | line += 41; | |
f4204ab9 JH |
38 | if (isspace(*line)) |
39 | return NULL; | |
e1e22e37 LT |
40 | if (line[len] != '\n') |
41 | return NULL; | |
42 | line[len] = 0; | |
cf0adba7 | 43 | |
e1e22e37 LT |
44 | return line; |
45 | } | |
46 | ||
8da19775 | 47 | static struct ref_list *add_ref(const char *name, const unsigned char *sha1, |
f4204ab9 JH |
48 | int flag, struct ref_list *list, |
49 | struct ref_list **new_entry) | |
e1e22e37 LT |
50 | { |
51 | int len; | |
c774aab9 | 52 | struct ref_list *entry; |
e1e22e37 LT |
53 | |
54 | /* Allocate it and add it in.. */ | |
55 | len = strlen(name) + 1; | |
56 | entry = xmalloc(sizeof(struct ref_list) + len); | |
57 | hashcpy(entry->sha1, sha1); | |
f4204ab9 | 58 | hashclr(entry->peeled); |
dce4bab6 MH |
59 | if (check_refname_format(name, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT)) |
60 | die("Reference has invalid format: '%s'", name); | |
e1e22e37 | 61 | memcpy(entry->name, name, len); |
8da19775 | 62 | entry->flag = flag; |
c774aab9 | 63 | entry->next = list; |
f4204ab9 JH |
64 | if (new_entry) |
65 | *new_entry = entry; | |
c774aab9 JP |
66 | return entry; |
67 | } | |
68 | ||
69 | /* merge sort the ref list */ | |
70 | static struct ref_list *sort_ref_list(struct ref_list *list) | |
71 | { | |
72 | int psize, qsize, last_merge_count, cmp; | |
73 | struct ref_list *p, *q, *l, *e; | |
74 | struct ref_list *new_list = list; | |
75 | int k = 1; | |
76 | int merge_count = 0; | |
77 | ||
78 | if (!list) | |
79 | return list; | |
80 | ||
81 | do { | |
82 | last_merge_count = merge_count; | |
83 | merge_count = 0; | |
84 | ||
85 | psize = 0; | |
86 | ||
87 | p = new_list; | |
88 | q = new_list; | |
89 | new_list = NULL; | |
90 | l = NULL; | |
91 | ||
92 | while (p) { | |
93 | merge_count++; | |
94 | ||
95 | while (psize < k && q->next) { | |
96 | q = q->next; | |
97 | psize++; | |
98 | } | |
99 | qsize = k; | |
100 | ||
101 | while ((psize > 0) || (qsize > 0 && q)) { | |
102 | if (qsize == 0 || !q) { | |
103 | e = p; | |
104 | p = p->next; | |
105 | psize--; | |
106 | } else if (psize == 0) { | |
107 | e = q; | |
108 | q = q->next; | |
109 | qsize--; | |
110 | } else { | |
111 | cmp = strcmp(q->name, p->name); | |
112 | if (cmp < 0) { | |
113 | e = q; | |
114 | q = q->next; | |
115 | qsize--; | |
116 | } else if (cmp > 0) { | |
117 | e = p; | |
118 | p = p->next; | |
119 | psize--; | |
120 | } else { | |
121 | if (hashcmp(q->sha1, p->sha1)) | |
122 | die("Duplicated ref, and SHA1s don't match: %s", | |
123 | q->name); | |
124 | warning("Duplicated ref: %s", q->name); | |
125 | e = q; | |
126 | q = q->next; | |
127 | qsize--; | |
128 | free(e); | |
129 | e = p; | |
130 | p = p->next; | |
131 | psize--; | |
132 | } | |
133 | } | |
134 | ||
135 | e->next = NULL; | |
136 | ||
137 | if (l) | |
138 | l->next = e; | |
139 | if (!new_list) | |
140 | new_list = e; | |
141 | l = e; | |
142 | } | |
143 | ||
144 | p = q; | |
145 | }; | |
146 | ||
147 | k = k * 2; | |
148 | } while ((last_merge_count != merge_count) || (last_merge_count != 1)); | |
149 | ||
150 | return new_list; | |
e1e22e37 LT |
151 | } |
152 | ||
5e290ff7 JH |
153 | /* |
154 | * Future: need to be in "struct repository" | |
155 | * when doing a full libification. | |
156 | */ | |
4175e9e3 | 157 | static struct cached_refs { |
5e290ff7 JH |
158 | char did_loose; |
159 | char did_packed; | |
160 | struct ref_list *loose; | |
161 | struct ref_list *packed; | |
0bad611b | 162 | } cached_refs, submodule_refs; |
0ae91be0 | 163 | static struct ref_list *current_ref; |
5e290ff7 | 164 | |
e142a3c6 DB |
165 | static struct ref_list *extra_refs; |
166 | ||
5e290ff7 JH |
167 | static void free_ref_list(struct ref_list *list) |
168 | { | |
169 | struct ref_list *next; | |
170 | for ( ; list; list = next) { | |
171 | next = list->next; | |
172 | free(list); | |
173 | } | |
174 | } | |
175 | ||
176 | static void invalidate_cached_refs(void) | |
e1e22e37 | 177 | { |
5e290ff7 JH |
178 | struct cached_refs *ca = &cached_refs; |
179 | ||
180 | if (ca->did_loose && ca->loose) | |
181 | free_ref_list(ca->loose); | |
182 | if (ca->did_packed && ca->packed) | |
183 | free_ref_list(ca->packed); | |
184 | ca->loose = ca->packed = NULL; | |
185 | ca->did_loose = ca->did_packed = 0; | |
186 | } | |
e1e22e37 | 187 | |
f4204ab9 JH |
188 | static void read_packed_refs(FILE *f, struct cached_refs *cached_refs) |
189 | { | |
190 | struct ref_list *list = NULL; | |
191 | struct ref_list *last = NULL; | |
192 | char refline[PATH_MAX]; | |
193 | int flag = REF_ISPACKED; | |
194 | ||
195 | while (fgets(refline, sizeof(refline), f)) { | |
196 | unsigned char sha1[20]; | |
197 | const char *name; | |
198 | static const char header[] = "# pack-refs with:"; | |
199 | ||
200 | if (!strncmp(refline, header, sizeof(header)-1)) { | |
201 | const char *traits = refline + sizeof(header) - 1; | |
202 | if (strstr(traits, " peeled ")) | |
203 | flag |= REF_KNOWS_PEELED; | |
204 | /* perhaps other traits later as well */ | |
205 | continue; | |
206 | } | |
207 | ||
208 | name = parse_ref_line(refline, sha1); | |
209 | if (name) { | |
210 | list = add_ref(name, sha1, flag, list, &last); | |
211 | continue; | |
212 | } | |
213 | if (last && | |
214 | refline[0] == '^' && | |
215 | strlen(refline) == 42 && | |
216 | refline[41] == '\n' && | |
217 | !get_sha1_hex(refline + 1, sha1)) | |
218 | hashcpy(last->peeled, sha1); | |
219 | } | |
c774aab9 | 220 | cached_refs->packed = sort_ref_list(list); |
f4204ab9 JH |
221 | } |
222 | ||
e142a3c6 DB |
223 | void add_extra_ref(const char *name, const unsigned char *sha1, int flag) |
224 | { | |
225 | extra_refs = add_ref(name, sha1, flag, extra_refs, NULL); | |
226 | } | |
227 | ||
228 | void clear_extra_refs(void) | |
229 | { | |
230 | free_ref_list(extra_refs); | |
231 | extra_refs = NULL; | |
232 | } | |
233 | ||
0bad611b | 234 | static struct ref_list *get_packed_refs(const char *submodule) |
5e290ff7 | 235 | { |
0bad611b HV |
236 | const char *packed_refs_file; |
237 | struct cached_refs *refs; | |
238 | ||
239 | if (submodule) { | |
240 | packed_refs_file = git_path_submodule(submodule, "packed-refs"); | |
241 | refs = &submodule_refs; | |
242 | free_ref_list(refs->packed); | |
243 | } else { | |
244 | packed_refs_file = git_path("packed-refs"); | |
245 | refs = &cached_refs; | |
246 | } | |
247 | ||
248 | if (!refs->did_packed || submodule) { | |
249 | FILE *f = fopen(packed_refs_file, "r"); | |
250 | refs->packed = NULL; | |
e1e22e37 | 251 | if (f) { |
0bad611b | 252 | read_packed_refs(f, refs); |
e1e22e37 | 253 | fclose(f); |
e1e22e37 | 254 | } |
0bad611b | 255 | refs->did_packed = 1; |
e1e22e37 | 256 | } |
0bad611b | 257 | return refs->packed; |
e1e22e37 LT |
258 | } |
259 | ||
0bad611b HV |
260 | static struct ref_list *get_ref_dir(const char *submodule, const char *base, |
261 | struct ref_list *list) | |
e1e22e37 | 262 | { |
0bad611b HV |
263 | DIR *dir; |
264 | const char *path; | |
265 | ||
266 | if (submodule) | |
267 | path = git_path_submodule(submodule, "%s", base); | |
268 | else | |
269 | path = git_path("%s", base); | |
270 | ||
271 | ||
272 | dir = opendir(path); | |
e1e22e37 LT |
273 | |
274 | if (dir) { | |
275 | struct dirent *de; | |
276 | int baselen = strlen(base); | |
ed378ec7 | 277 | char *ref = xmalloc(baselen + 257); |
e1e22e37 | 278 | |
ed378ec7 | 279 | memcpy(ref, base, baselen); |
e1e22e37 | 280 | if (baselen && base[baselen-1] != '/') |
ed378ec7 | 281 | ref[baselen++] = '/'; |
e1e22e37 LT |
282 | |
283 | while ((de = readdir(dir)) != NULL) { | |
284 | unsigned char sha1[20]; | |
285 | struct stat st; | |
8da19775 | 286 | int flag; |
e1e22e37 | 287 | int namelen; |
0bad611b | 288 | const char *refdir; |
e1e22e37 LT |
289 | |
290 | if (de->d_name[0] == '.') | |
291 | continue; | |
292 | namelen = strlen(de->d_name); | |
293 | if (namelen > 255) | |
294 | continue; | |
295 | if (has_extension(de->d_name, ".lock")) | |
296 | continue; | |
ed378ec7 | 297 | memcpy(ref + baselen, de->d_name, namelen+1); |
0bad611b HV |
298 | refdir = submodule |
299 | ? git_path_submodule(submodule, "%s", ref) | |
300 | : git_path("%s", ref); | |
301 | if (stat(refdir, &st) < 0) | |
e1e22e37 LT |
302 | continue; |
303 | if (S_ISDIR(st.st_mode)) { | |
0bad611b | 304 | list = get_ref_dir(submodule, ref, list); |
e1e22e37 LT |
305 | continue; |
306 | } | |
0bad611b | 307 | if (submodule) { |
f8948e2f | 308 | hashclr(sha1); |
0bad611b HV |
309 | flag = 0; |
310 | if (resolve_gitlink_ref(submodule, ref, sha1) < 0) { | |
311 | hashclr(sha1); | |
312 | flag |= REF_BROKEN; | |
313 | } | |
314 | } else | |
315 | if (!resolve_ref(ref, sha1, 1, &flag)) { | |
316 | hashclr(sha1); | |
317 | flag |= REF_BROKEN; | |
318 | } | |
f4204ab9 | 319 | list = add_ref(ref, sha1, flag, list, NULL); |
e1e22e37 | 320 | } |
ed378ec7 | 321 | free(ref); |
e1e22e37 LT |
322 | closedir(dir); |
323 | } | |
c774aab9 | 324 | return sort_ref_list(list); |
e1e22e37 LT |
325 | } |
326 | ||
f8948e2f | 327 | struct warn_if_dangling_data { |
3cf6134a | 328 | FILE *fp; |
f8948e2f JH |
329 | const char *refname; |
330 | const char *msg_fmt; | |
331 | }; | |
332 | ||
333 | static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1, | |
334 | int flags, void *cb_data) | |
335 | { | |
336 | struct warn_if_dangling_data *d = cb_data; | |
337 | const char *resolves_to; | |
338 | unsigned char junk[20]; | |
339 | ||
340 | if (!(flags & REF_ISSYMREF)) | |
341 | return 0; | |
342 | ||
343 | resolves_to = resolve_ref(refname, junk, 0, NULL); | |
344 | if (!resolves_to || strcmp(resolves_to, d->refname)) | |
345 | return 0; | |
346 | ||
3cf6134a | 347 | fprintf(d->fp, d->msg_fmt, refname); |
f8948e2f JH |
348 | return 0; |
349 | } | |
350 | ||
3cf6134a | 351 | void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname) |
f8948e2f | 352 | { |
66dbfd55 GV |
353 | struct warn_if_dangling_data data; |
354 | ||
355 | data.fp = fp; | |
356 | data.refname = refname; | |
357 | data.msg_fmt = msg_fmt; | |
f8948e2f JH |
358 | for_each_rawref(warn_if_dangling_symref, &data); |
359 | } | |
360 | ||
0bad611b | 361 | static struct ref_list *get_loose_refs(const char *submodule) |
e1e22e37 | 362 | { |
0bad611b HV |
363 | if (submodule) { |
364 | free_ref_list(submodule_refs.loose); | |
365 | submodule_refs.loose = get_ref_dir(submodule, "refs", NULL); | |
366 | return submodule_refs.loose; | |
367 | } | |
368 | ||
5e290ff7 | 369 | if (!cached_refs.did_loose) { |
0bad611b | 370 | cached_refs.loose = get_ref_dir(NULL, "refs", NULL); |
5e290ff7 | 371 | cached_refs.did_loose = 1; |
e1e22e37 | 372 | } |
5e290ff7 | 373 | return cached_refs.loose; |
e1e22e37 LT |
374 | } |
375 | ||
ca8db142 LT |
376 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
377 | #define MAXDEPTH 5 | |
0ebde32c LT |
378 | #define MAXREFLEN (1024) |
379 | ||
380 | static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result) | |
381 | { | |
382 | FILE *f; | |
383 | struct cached_refs refs; | |
384 | struct ref_list *ref; | |
385 | int retval; | |
386 | ||
387 | strcpy(name + pathlen, "packed-refs"); | |
388 | f = fopen(name, "r"); | |
389 | if (!f) | |
390 | return -1; | |
391 | read_packed_refs(f, &refs); | |
392 | fclose(f); | |
393 | ref = refs.packed; | |
394 | retval = -1; | |
395 | while (ref) { | |
396 | if (!strcmp(ref->name, refname)) { | |
397 | retval = 0; | |
398 | memcpy(result, ref->sha1, 20); | |
399 | break; | |
400 | } | |
401 | ref = ref->next; | |
402 | } | |
403 | free_ref_list(refs.packed); | |
404 | return retval; | |
405 | } | |
406 | ||
407 | static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion) | |
408 | { | |
409 | int fd, len = strlen(refname); | |
410 | char buffer[128], *p; | |
411 | ||
412 | if (recursion > MAXDEPTH || len > MAXREFLEN) | |
413 | return -1; | |
414 | memcpy(name + pathlen, refname, len+1); | |
415 | fd = open(name, O_RDONLY); | |
416 | if (fd < 0) | |
417 | return resolve_gitlink_packed_ref(name, pathlen, refname, result); | |
418 | ||
419 | len = read(fd, buffer, sizeof(buffer)-1); | |
420 | close(fd); | |
421 | if (len < 0) | |
422 | return -1; | |
423 | while (len && isspace(buffer[len-1])) | |
424 | len--; | |
425 | buffer[len] = 0; | |
426 | ||
427 | /* Was it a detached head or an old-fashioned symlink? */ | |
428 | if (!get_sha1_hex(buffer, result)) | |
429 | return 0; | |
430 | ||
431 | /* Symref? */ | |
432 | if (strncmp(buffer, "ref:", 4)) | |
433 | return -1; | |
434 | p = buffer + 4; | |
435 | while (isspace(*p)) | |
436 | p++; | |
437 | ||
438 | return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1); | |
439 | } | |
440 | ||
441 | int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result) | |
442 | { | |
443 | int len = strlen(path), retval; | |
444 | char *gitdir; | |
842abf06 | 445 | const char *tmp; |
0ebde32c LT |
446 | |
447 | while (len && path[len-1] == '/') | |
448 | len--; | |
449 | if (!len) | |
450 | return -1; | |
451 | gitdir = xmalloc(len + MAXREFLEN + 8); | |
452 | memcpy(gitdir, path, len); | |
842abf06 LH |
453 | memcpy(gitdir + len, "/.git", 6); |
454 | len += 5; | |
455 | ||
13d6ec91 | 456 | tmp = read_gitfile(gitdir); |
842abf06 LH |
457 | if (tmp) { |
458 | free(gitdir); | |
459 | len = strlen(tmp); | |
460 | gitdir = xmalloc(len + MAXREFLEN + 3); | |
461 | memcpy(gitdir, tmp, len); | |
462 | } | |
463 | gitdir[len] = '/'; | |
464 | gitdir[++len] = '\0'; | |
465 | retval = resolve_gitlink_ref_recursive(gitdir, len, refname, result, 0); | |
0ebde32c LT |
466 | free(gitdir); |
467 | return retval; | |
468 | } | |
ca8db142 | 469 | |
c224ca7f MH |
470 | /* |
471 | * Try to read ref from the packed references. On success, set sha1 | |
472 | * and return 0; otherwise, return -1. | |
473 | */ | |
474 | static int get_packed_ref(const char *ref, unsigned char *sha1) | |
475 | { | |
476 | struct ref_list *list = get_packed_refs(NULL); | |
477 | while (list) { | |
478 | if (!strcmp(ref, list->name)) { | |
479 | hashcpy(sha1, list->sha1); | |
480 | return 0; | |
481 | } | |
482 | list = list->next; | |
483 | } | |
484 | return -1; | |
485 | } | |
486 | ||
8da19775 | 487 | const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 488 | { |
0104ca09 HO |
489 | int depth = MAXDEPTH; |
490 | ssize_t len; | |
a876ed83 | 491 | char buffer[256]; |
ed378ec7 | 492 | static char ref_buffer[256]; |
629cd3ac | 493 | char path[PATH_MAX]; |
ca8db142 | 494 | |
8da19775 JH |
495 | if (flag) |
496 | *flag = 0; | |
497 | ||
8384d788 MH |
498 | if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL)) |
499 | return NULL; | |
500 | ||
a876ed83 JH |
501 | for (;;) { |
502 | struct stat st; | |
503 | char *buf; | |
504 | int fd; | |
8a65ff76 | 505 | |
a876ed83 JH |
506 | if (--depth < 0) |
507 | return NULL; | |
ca8db142 | 508 | |
958a4789 | 509 | git_snpath(path, sizeof(path), "%s", ref); |
c224ca7f | 510 | |
a876ed83 | 511 | if (lstat(path, &st) < 0) { |
c224ca7f MH |
512 | if (errno != ENOENT) |
513 | return NULL; | |
514 | /* | |
515 | * The loose reference file does not exist; | |
516 | * check for a packed reference. | |
517 | */ | |
518 | if (!get_packed_ref(ref, sha1)) { | |
519 | if (flag) | |
520 | *flag |= REF_ISPACKED; | |
521 | return ref; | |
434cd0cd | 522 | } |
c224ca7f MH |
523 | /* The reference is not a packed reference, either. */ |
524 | if (reading) { | |
a876ed83 | 525 | return NULL; |
c224ca7f MH |
526 | } else { |
527 | hashclr(sha1); | |
528 | return ref; | |
529 | } | |
a876ed83 | 530 | } |
ca8db142 | 531 | |
a876ed83 JH |
532 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
533 | if (S_ISLNK(st.st_mode)) { | |
534 | len = readlink(path, buffer, sizeof(buffer)-1); | |
7bb2bf8e MH |
535 | if (len < 0) |
536 | return NULL; | |
b54cb795 | 537 | buffer[len] = 0; |
1f58a038 MH |
538 | if (!prefixcmp(buffer, "refs/") && |
539 | !check_refname_format(buffer, 0)) { | |
ed378ec7 LT |
540 | strcpy(ref_buffer, buffer); |
541 | ref = ref_buffer; | |
8da19775 JH |
542 | if (flag) |
543 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
544 | continue; |
545 | } | |
ca8db142 | 546 | } |
a876ed83 | 547 | |
7a21632f DS |
548 | /* Is it a directory? */ |
549 | if (S_ISDIR(st.st_mode)) { | |
550 | errno = EISDIR; | |
551 | return NULL; | |
552 | } | |
553 | ||
a876ed83 JH |
554 | /* |
555 | * Anything else, just open it and try to use it as | |
556 | * a ref | |
557 | */ | |
558 | fd = open(path, O_RDONLY); | |
559 | if (fd < 0) | |
560 | return NULL; | |
93d26e4c | 561 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
a876ed83 | 562 | close(fd); |
28775050 MH |
563 | if (len < 0) |
564 | return NULL; | |
565 | while (len && isspace(buffer[len-1])) | |
566 | len--; | |
567 | buffer[len] = '\0'; | |
a876ed83 JH |
568 | |
569 | /* | |
570 | * Is it a symbolic ref? | |
571 | */ | |
28775050 | 572 | if (prefixcmp(buffer, "ref:")) |
a876ed83 JH |
573 | break; |
574 | buf = buffer + 4; | |
28775050 MH |
575 | while (isspace(*buf)) |
576 | buf++; | |
313fb010 MH |
577 | if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) { |
578 | warning("symbolic reference in %s is formatted incorrectly", | |
579 | path); | |
580 | return NULL; | |
581 | } | |
28775050 | 582 | ref = strcpy(ref_buffer, buf); |
8da19775 JH |
583 | if (flag) |
584 | *flag |= REF_ISSYMREF; | |
8a65ff76 | 585 | } |
f989fea0 MH |
586 | /* Please note that FETCH_HEAD has a second line containing other data. */ |
587 | if (get_sha1_hex(buffer, sha1) || (buffer[40] != '\0' && !isspace(buffer[40]))) { | |
629cd3ac | 588 | warning("reference in %s is formatted incorrectly", path); |
a876ed83 | 589 | return NULL; |
629cd3ac | 590 | } |
ed378ec7 | 591 | return ref; |
a876ed83 JH |
592 | } |
593 | ||
d08bae7e IL |
594 | /* The argument to filter_refs */ |
595 | struct ref_filter { | |
596 | const char *pattern; | |
597 | each_ref_fn *fn; | |
598 | void *cb_data; | |
599 | }; | |
600 | ||
ed378ec7 | 601 | int read_ref(const char *ref, unsigned char *sha1) |
a876ed83 | 602 | { |
8da19775 | 603 | if (resolve_ref(ref, sha1, 1, NULL)) |
a876ed83 JH |
604 | return 0; |
605 | return -1; | |
8a65ff76 LT |
606 | } |
607 | ||
f8948e2f | 608 | #define DO_FOR_EACH_INCLUDE_BROKEN 01 |
ef06b918 | 609 | static int do_one_ref(const char *base, each_ref_fn fn, int trim, |
f8948e2f | 610 | int flags, void *cb_data, struct ref_list *entry) |
ef06b918 | 611 | { |
b3cfc406 | 612 | if (prefixcmp(entry->name, base)) |
ef06b918 | 613 | return 0; |
e01de1c9 | 614 | |
f8948e2f | 615 | if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) { |
e01de1c9 JH |
616 | if (entry->flag & REF_BROKEN) |
617 | return 0; /* ignore dangling symref */ | |
f8948e2f JH |
618 | if (!has_sha1_file(entry->sha1)) { |
619 | error("%s does not point to a valid object!", entry->name); | |
620 | return 0; | |
621 | } | |
ef06b918 | 622 | } |
0ae91be0 | 623 | current_ref = entry; |
ef06b918 JH |
624 | return fn(entry->name + trim, entry->sha1, entry->flag, cb_data); |
625 | } | |
626 | ||
d08bae7e IL |
627 | static int filter_refs(const char *ref, const unsigned char *sha, int flags, |
628 | void *data) | |
629 | { | |
630 | struct ref_filter *filter = (struct ref_filter *)data; | |
631 | if (fnmatch(filter->pattern, ref, 0)) | |
632 | return 0; | |
633 | return filter->fn(ref, sha, flags, filter->cb_data); | |
634 | } | |
635 | ||
cf0adba7 JH |
636 | int peel_ref(const char *ref, unsigned char *sha1) |
637 | { | |
638 | int flag; | |
639 | unsigned char base[20]; | |
640 | struct object *o; | |
641 | ||
0ae91be0 SP |
642 | if (current_ref && (current_ref->name == ref |
643 | || !strcmp(current_ref->name, ref))) { | |
644 | if (current_ref->flag & REF_KNOWS_PEELED) { | |
645 | hashcpy(sha1, current_ref->peeled); | |
646 | return 0; | |
647 | } | |
648 | hashcpy(base, current_ref->sha1); | |
649 | goto fallback; | |
650 | } | |
651 | ||
cf0adba7 JH |
652 | if (!resolve_ref(ref, base, 1, &flag)) |
653 | return -1; | |
654 | ||
655 | if ((flag & REF_ISPACKED)) { | |
0bad611b | 656 | struct ref_list *list = get_packed_refs(NULL); |
cf0adba7 JH |
657 | |
658 | while (list) { | |
f4204ab9 JH |
659 | if (!strcmp(list->name, ref)) { |
660 | if (list->flag & REF_KNOWS_PEELED) { | |
661 | hashcpy(sha1, list->peeled); | |
662 | return 0; | |
663 | } | |
664 | /* older pack-refs did not leave peeled ones */ | |
665 | break; | |
cf0adba7 JH |
666 | } |
667 | list = list->next; | |
668 | } | |
cf0adba7 JH |
669 | } |
670 | ||
0ae91be0 | 671 | fallback: |
cf0adba7 | 672 | o = parse_object(base); |
8c87dc77 | 673 | if (o && o->type == OBJ_TAG) { |
cf0adba7 JH |
674 | o = deref_tag(o, ref, 0); |
675 | if (o) { | |
676 | hashcpy(sha1, o->sha1); | |
677 | return 0; | |
678 | } | |
679 | } | |
680 | return -1; | |
681 | } | |
682 | ||
0bad611b HV |
683 | static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn, |
684 | int trim, int flags, void *cb_data) | |
8a65ff76 | 685 | { |
0ae91be0 | 686 | int retval = 0; |
0bad611b HV |
687 | struct ref_list *packed = get_packed_refs(submodule); |
688 | struct ref_list *loose = get_loose_refs(submodule); | |
8a65ff76 | 689 | |
e142a3c6 DB |
690 | struct ref_list *extra; |
691 | ||
692 | for (extra = extra_refs; extra; extra = extra->next) | |
f8948e2f | 693 | retval = do_one_ref(base, fn, trim, flags, cb_data, extra); |
e142a3c6 | 694 | |
e1e22e37 LT |
695 | while (packed && loose) { |
696 | struct ref_list *entry; | |
697 | int cmp = strcmp(packed->name, loose->name); | |
698 | if (!cmp) { | |
699 | packed = packed->next; | |
700 | continue; | |
6cada6a9 | 701 | } |
e1e22e37 LT |
702 | if (cmp > 0) { |
703 | entry = loose; | |
704 | loose = loose->next; | |
705 | } else { | |
706 | entry = packed; | |
707 | packed = packed->next; | |
708 | } | |
f8948e2f | 709 | retval = do_one_ref(base, fn, trim, flags, cb_data, entry); |
e1e22e37 | 710 | if (retval) |
0ae91be0 | 711 | goto end_each; |
e1e22e37 | 712 | } |
8a65ff76 | 713 | |
ef06b918 | 714 | for (packed = packed ? packed : loose; packed; packed = packed->next) { |
f8948e2f | 715 | retval = do_one_ref(base, fn, trim, flags, cb_data, packed); |
ef06b918 | 716 | if (retval) |
0ae91be0 | 717 | goto end_each; |
8a65ff76 | 718 | } |
0ae91be0 SP |
719 | |
720 | end_each: | |
721 | current_ref = NULL; | |
722 | return retval; | |
8a65ff76 LT |
723 | } |
724 | ||
0bad611b HV |
725 | |
726 | static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data) | |
723c31fe LT |
727 | { |
728 | unsigned char sha1[20]; | |
8da19775 JH |
729 | int flag; |
730 | ||
0bad611b HV |
731 | if (submodule) { |
732 | if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0) | |
733 | return fn("HEAD", sha1, 0, cb_data); | |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
8da19775 JH |
738 | if (resolve_ref("HEAD", sha1, 1, &flag)) |
739 | return fn("HEAD", sha1, flag, cb_data); | |
0bad611b | 740 | |
2f34ba32 | 741 | return 0; |
723c31fe LT |
742 | } |
743 | ||
0bad611b HV |
744 | int head_ref(each_ref_fn fn, void *cb_data) |
745 | { | |
746 | return do_head_ref(NULL, fn, cb_data); | |
747 | } | |
748 | ||
9ef6aeb0 HV |
749 | int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
750 | { | |
751 | return do_head_ref(submodule, fn, cb_data); | |
752 | } | |
753 | ||
cb5d709f | 754 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 755 | { |
b3cfc406 | 756 | return do_for_each_ref(NULL, "", fn, 0, 0, cb_data); |
a62be77f SE |
757 | } |
758 | ||
9ef6aeb0 HV |
759 | int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
760 | { | |
b3cfc406 | 761 | return do_for_each_ref(submodule, "", fn, 0, 0, cb_data); |
a62be77f SE |
762 | } |
763 | ||
2a8177b6 CC |
764 | int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data) |
765 | { | |
0bad611b | 766 | return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data); |
2a8177b6 CC |
767 | } |
768 | ||
9ef6aeb0 HV |
769 | int for_each_ref_in_submodule(const char *submodule, const char *prefix, |
770 | each_ref_fn fn, void *cb_data) | |
771 | { | |
772 | return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data); | |
2a8177b6 CC |
773 | } |
774 | ||
cb5d709f | 775 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 776 | { |
2a8177b6 | 777 | return for_each_ref_in("refs/tags/", fn, cb_data); |
a62be77f SE |
778 | } |
779 | ||
9ef6aeb0 HV |
780 | int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
781 | { | |
782 | return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data); | |
783 | } | |
784 | ||
cb5d709f | 785 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 786 | { |
2a8177b6 | 787 | return for_each_ref_in("refs/heads/", fn, cb_data); |
a62be77f SE |
788 | } |
789 | ||
9ef6aeb0 HV |
790 | int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
791 | { | |
792 | return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data); | |
793 | } | |
794 | ||
cb5d709f | 795 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 796 | { |
2a8177b6 | 797 | return for_each_ref_in("refs/remotes/", fn, cb_data); |
f8948e2f JH |
798 | } |
799 | ||
9ef6aeb0 HV |
800 | int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
801 | { | |
802 | return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data); | |
803 | } | |
804 | ||
29268700 CC |
805 | int for_each_replace_ref(each_ref_fn fn, void *cb_data) |
806 | { | |
0bad611b | 807 | return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data); |
29268700 CC |
808 | } |
809 | ||
a1bea2c1 JT |
810 | int head_ref_namespaced(each_ref_fn fn, void *cb_data) |
811 | { | |
812 | struct strbuf buf = STRBUF_INIT; | |
813 | int ret = 0; | |
814 | unsigned char sha1[20]; | |
815 | int flag; | |
816 | ||
817 | strbuf_addf(&buf, "%sHEAD", get_git_namespace()); | |
818 | if (resolve_ref(buf.buf, sha1, 1, &flag)) | |
819 | ret = fn(buf.buf, sha1, flag, cb_data); | |
820 | strbuf_release(&buf); | |
821 | ||
822 | return ret; | |
823 | } | |
824 | ||
825 | int for_each_namespaced_ref(each_ref_fn fn, void *cb_data) | |
826 | { | |
827 | struct strbuf buf = STRBUF_INIT; | |
828 | int ret; | |
829 | strbuf_addf(&buf, "%srefs/", get_git_namespace()); | |
830 | ret = do_for_each_ref(NULL, buf.buf, fn, 0, 0, cb_data); | |
831 | strbuf_release(&buf); | |
832 | return ret; | |
833 | } | |
834 | ||
b09fe971 IL |
835 | int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, |
836 | const char *prefix, void *cb_data) | |
d08bae7e IL |
837 | { |
838 | struct strbuf real_pattern = STRBUF_INIT; | |
839 | struct ref_filter filter; | |
d08bae7e IL |
840 | int ret; |
841 | ||
b09fe971 | 842 | if (!prefix && prefixcmp(pattern, "refs/")) |
d08bae7e | 843 | strbuf_addstr(&real_pattern, "refs/"); |
b09fe971 IL |
844 | else if (prefix) |
845 | strbuf_addstr(&real_pattern, prefix); | |
d08bae7e IL |
846 | strbuf_addstr(&real_pattern, pattern); |
847 | ||
894a9d33 | 848 | if (!has_glob_specials(pattern)) { |
9517e6b8 | 849 | /* Append implied '/' '*' if not present. */ |
d08bae7e IL |
850 | if (real_pattern.buf[real_pattern.len - 1] != '/') |
851 | strbuf_addch(&real_pattern, '/'); | |
852 | /* No need to check for '*', there is none. */ | |
853 | strbuf_addch(&real_pattern, '*'); | |
854 | } | |
855 | ||
856 | filter.pattern = real_pattern.buf; | |
857 | filter.fn = fn; | |
858 | filter.cb_data = cb_data; | |
859 | ret = for_each_ref(filter_refs, &filter); | |
860 | ||
861 | strbuf_release(&real_pattern); | |
862 | return ret; | |
863 | } | |
864 | ||
b09fe971 IL |
865 | int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data) |
866 | { | |
867 | return for_each_glob_ref_in(fn, pattern, NULL, cb_data); | |
868 | } | |
869 | ||
f8948e2f JH |
870 | int for_each_rawref(each_ref_fn fn, void *cb_data) |
871 | { | |
b3cfc406 | 872 | return do_for_each_ref(NULL, "", fn, 0, |
f8948e2f | 873 | DO_FOR_EACH_INCLUDE_BROKEN, cb_data); |
8a65ff76 LT |
874 | } |
875 | ||
03feddd6 JH |
876 | /* |
877 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
878 | * We do not like it if: | |
879 | * | |
880 | * - any path component of it begins with ".", or | |
881 | * - it has double dots "..", or | |
882 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
883 | * - it ends with a "/". | |
3e262b95 | 884 | * - it ends with ".lock" |
a4c2e699 | 885 | * - it contains a "\" (backslash) |
03feddd6 JH |
886 | */ |
887 | ||
9224b73b | 888 | /* Return true iff ch is not allowed in reference names. */ |
03feddd6 JH |
889 | static inline int bad_ref_char(int ch) |
890 | { | |
f3738c1c | 891 | if (((unsigned) ch) <= ' ' || ch == 0x7f || |
a4c2e699 | 892 | ch == '~' || ch == '^' || ch == ':' || ch == '\\') |
8558fd9e DB |
893 | return 1; |
894 | /* 2.13 Pattern Matching Notation */ | |
9224b73b | 895 | if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */ |
8558fd9e | 896 | return 1; |
8558fd9e | 897 | return 0; |
03feddd6 JH |
898 | } |
899 | ||
49295d4e MH |
900 | /* |
901 | * Try to read one refname component from the front of ref. Return | |
902 | * the length of the component found, or -1 if the component is not | |
903 | * legal. | |
904 | */ | |
dce4bab6 | 905 | static int check_refname_component(const char *ref, int flags) |
49295d4e MH |
906 | { |
907 | const char *cp; | |
908 | char last = '\0'; | |
909 | ||
910 | for (cp = ref; ; cp++) { | |
911 | char ch = *cp; | |
912 | if (ch == '\0' || ch == '/') | |
913 | break; | |
914 | if (bad_ref_char(ch)) | |
915 | return -1; /* Illegal character in refname. */ | |
916 | if (last == '.' && ch == '.') | |
917 | return -1; /* Refname contains "..". */ | |
918 | if (last == '@' && ch == '{') | |
919 | return -1; /* Refname contains "@{". */ | |
920 | last = ch; | |
921 | } | |
922 | if (cp == ref) | |
923 | return -1; /* Component has zero length. */ | |
dce4bab6 MH |
924 | if (ref[0] == '.') { |
925 | if (!(flags & REFNAME_DOT_COMPONENT)) | |
926 | return -1; /* Component starts with '.'. */ | |
927 | /* | |
928 | * Even if leading dots are allowed, don't allow "." | |
929 | * as a component (".." is prevented by a rule above). | |
930 | */ | |
931 | if (ref[1] == '\0') | |
932 | return -1; /* Component equals ".". */ | |
933 | } | |
7e9d2fe9 MH |
934 | if (cp - ref >= 5 && !memcmp(cp - 5, ".lock", 5)) |
935 | return -1; /* Refname ends with ".lock". */ | |
49295d4e MH |
936 | return cp - ref; |
937 | } | |
938 | ||
8d9c5010 | 939 | int check_refname_format(const char *ref, int flags) |
95fc7512 | 940 | { |
49295d4e | 941 | int component_len, component_count = 0; |
03feddd6 | 942 | |
03feddd6 | 943 | while (1) { |
49295d4e | 944 | /* We are at the start of a path component. */ |
dce4bab6 | 945 | component_len = check_refname_component(ref, flags); |
49295d4e MH |
946 | if (component_len < 0) { |
947 | if ((flags & REFNAME_REFSPEC_PATTERN) && | |
948 | ref[0] == '*' && | |
949 | (ref[1] == '\0' || ref[1] == '/')) { | |
8d9c5010 MH |
950 | /* Accept one wildcard as a full refname component. */ |
951 | flags &= ~REFNAME_REFSPEC_PATTERN; | |
49295d4e MH |
952 | component_len = 1; |
953 | } else { | |
8d9c5010 | 954 | return -1; |
49295d4e | 955 | } |
03feddd6 | 956 | } |
49295d4e MH |
957 | component_count++; |
958 | if (ref[component_len] == '\0') | |
959 | break; | |
960 | /* Skip to next component. */ | |
961 | ref += component_len + 1; | |
03feddd6 | 962 | } |
49295d4e MH |
963 | |
964 | if (ref[component_len - 1] == '.') | |
965 | return -1; /* Refname ends with '.'. */ | |
49295d4e MH |
966 | if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2) |
967 | return -1; /* Refname has only one component. */ | |
968 | return 0; | |
95fc7512 DB |
969 | } |
970 | ||
4577e483 | 971 | const char *prettify_refname(const char *name) |
a9c37a72 | 972 | { |
a9c37a72 DB |
973 | return name + ( |
974 | !prefixcmp(name, "refs/heads/") ? 11 : | |
975 | !prefixcmp(name, "refs/tags/") ? 10 : | |
976 | !prefixcmp(name, "refs/remotes/") ? 13 : | |
977 | 0); | |
978 | } | |
979 | ||
79803322 SP |
980 | const char *ref_rev_parse_rules[] = { |
981 | "%.*s", | |
982 | "refs/%.*s", | |
983 | "refs/tags/%.*s", | |
984 | "refs/heads/%.*s", | |
985 | "refs/remotes/%.*s", | |
986 | "refs/remotes/%.*s/HEAD", | |
987 | NULL | |
988 | }; | |
989 | ||
605b4978 SP |
990 | const char *ref_fetch_rules[] = { |
991 | "%.*s", | |
992 | "refs/%.*s", | |
993 | "refs/heads/%.*s", | |
994 | NULL | |
995 | }; | |
996 | ||
79803322 SP |
997 | int refname_match(const char *abbrev_name, const char *full_name, const char **rules) |
998 | { | |
999 | const char **p; | |
1000 | const int abbrev_name_len = strlen(abbrev_name); | |
1001 | ||
1002 | for (p = rules; *p; p++) { | |
1003 | if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { | |
1004 | return 1; | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | return 0; | |
1009 | } | |
1010 | ||
e5f38ec3 | 1011 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
1012 | const unsigned char *old_sha1, int mustexist) |
1013 | { | |
8da19775 | 1014 | if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 1015 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
1016 | unlock_ref(lock); |
1017 | return NULL; | |
1018 | } | |
a89fccd2 | 1019 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 1020 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
1021 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
1022 | unlock_ref(lock); | |
1023 | return NULL; | |
1024 | } | |
1025 | return lock; | |
1026 | } | |
1027 | ||
7155b727 | 1028 | static int remove_empty_directories(const char *file) |
bc7127ef JH |
1029 | { |
1030 | /* we want to create a file but there is a directory there; | |
1031 | * if that is an empty directory (or a directory that contains | |
1032 | * only empty directories), remove them. | |
1033 | */ | |
7155b727 JS |
1034 | struct strbuf path; |
1035 | int result; | |
bc7127ef | 1036 | |
7155b727 JS |
1037 | strbuf_init(&path, 20); |
1038 | strbuf_addstr(&path, file); | |
1039 | ||
a0f4afbe | 1040 | result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY); |
7155b727 JS |
1041 | |
1042 | strbuf_release(&path); | |
1043 | ||
1044 | return result; | |
bc7127ef JH |
1045 | } |
1046 | ||
c976d415 LH |
1047 | static int is_refname_available(const char *ref, const char *oldref, |
1048 | struct ref_list *list, int quiet) | |
1049 | { | |
1050 | int namlen = strlen(ref); /* e.g. 'foo/bar' */ | |
1051 | while (list) { | |
1052 | /* list->name could be 'foo' or 'foo/bar/baz' */ | |
1053 | if (!oldref || strcmp(oldref, list->name)) { | |
1054 | int len = strlen(list->name); | |
1055 | int cmplen = (namlen < len) ? namlen : len; | |
1056 | const char *lead = (namlen < len) ? list->name : ref; | |
1057 | if (!strncmp(ref, list->name, cmplen) && | |
1058 | lead[cmplen] == '/') { | |
1059 | if (!quiet) | |
1060 | error("'%s' exists; cannot create '%s'", | |
1061 | list->name, ref); | |
1062 | return 0; | |
1063 | } | |
1064 | } | |
1065 | list = list->next; | |
1066 | } | |
1067 | return 1; | |
1068 | } | |
1069 | ||
ff74f7f1 JH |
1070 | /* |
1071 | * *string and *len will only be substituted, and *string returned (for | |
1072 | * later free()ing) if the string passed in is a magic short-hand form | |
1073 | * to name a branch. | |
1074 | */ | |
1075 | static char *substitute_branch_name(const char **string, int *len) | |
1076 | { | |
1077 | struct strbuf buf = STRBUF_INIT; | |
1078 | int ret = interpret_branch_name(*string, &buf); | |
1079 | ||
1080 | if (ret == *len) { | |
1081 | size_t size; | |
1082 | *string = strbuf_detach(&buf, &size); | |
1083 | *len = size; | |
1084 | return (char *)*string; | |
1085 | } | |
1086 | ||
1087 | return NULL; | |
1088 | } | |
1089 | ||
1090 | int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref) | |
1091 | { | |
1092 | char *last_branch = substitute_branch_name(&str, &len); | |
1093 | const char **p, *r; | |
1094 | int refs_found = 0; | |
1095 | ||
1096 | *ref = NULL; | |
1097 | for (p = ref_rev_parse_rules; *p; p++) { | |
1098 | char fullref[PATH_MAX]; | |
1099 | unsigned char sha1_from_ref[20]; | |
1100 | unsigned char *this_result; | |
1101 | int flag; | |
1102 | ||
1103 | this_result = refs_found ? sha1_from_ref : sha1; | |
1104 | mksnpath(fullref, sizeof(fullref), *p, len, str); | |
1105 | r = resolve_ref(fullref, this_result, 1, &flag); | |
1106 | if (r) { | |
1107 | if (!refs_found++) | |
1108 | *ref = xstrdup(r); | |
1109 | if (!warn_ambiguous_refs) | |
1110 | break; | |
1111 | } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) | |
1112 | warning("ignoring dangling symref %s.", fullref); | |
1113 | } | |
1114 | free(last_branch); | |
1115 | return refs_found; | |
1116 | } | |
1117 | ||
1118 | int dwim_log(const char *str, int len, unsigned char *sha1, char **log) | |
1119 | { | |
1120 | char *last_branch = substitute_branch_name(&str, &len); | |
1121 | const char **p; | |
1122 | int logs_found = 0; | |
1123 | ||
1124 | *log = NULL; | |
1125 | for (p = ref_rev_parse_rules; *p; p++) { | |
1126 | struct stat st; | |
1127 | unsigned char hash[20]; | |
1128 | char path[PATH_MAX]; | |
1129 | const char *ref, *it; | |
1130 | ||
1131 | mksnpath(path, sizeof(path), *p, len, str); | |
1132 | ref = resolve_ref(path, hash, 1, NULL); | |
1133 | if (!ref) | |
1134 | continue; | |
1135 | if (!stat(git_path("logs/%s", path), &st) && | |
1136 | S_ISREG(st.st_mode)) | |
1137 | it = path; | |
1138 | else if (strcmp(ref, path) && | |
1139 | !stat(git_path("logs/%s", ref), &st) && | |
1140 | S_ISREG(st.st_mode)) | |
1141 | it = ref; | |
1142 | else | |
1143 | continue; | |
1144 | if (!logs_found++) { | |
1145 | *log = xstrdup(it); | |
1146 | hashcpy(sha1, hash); | |
1147 | } | |
1148 | if (!warn_ambiguous_refs) | |
1149 | break; | |
1150 | } | |
1151 | free(last_branch); | |
1152 | return logs_found; | |
1153 | } | |
1154 | ||
68db31cc | 1155 | static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p) |
4bd18c43 | 1156 | { |
434cd0cd | 1157 | char *ref_file; |
ed378ec7 | 1158 | const char *orig_ref = ref; |
4bd18c43 | 1159 | struct ref_lock *lock; |
5cc3cef9 | 1160 | int last_errno = 0; |
acd3b9ec | 1161 | int type, lflags; |
4431fcc4 | 1162 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
5bdd8d4a | 1163 | int missing = 0; |
4bd18c43 SP |
1164 | |
1165 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
1166 | lock->lock_fd = -1; | |
1167 | ||
68db31cc | 1168 | ref = resolve_ref(ref, lock->old_sha1, mustexist, &type); |
bc7127ef JH |
1169 | if (!ref && errno == EISDIR) { |
1170 | /* we are trying to lock foo but we used to | |
1171 | * have foo/bar which now does not exist; | |
1172 | * it is normal for the empty directory 'foo' | |
1173 | * to remain. | |
1174 | */ | |
1175 | ref_file = git_path("%s", orig_ref); | |
5cc3cef9 JH |
1176 | if (remove_empty_directories(ref_file)) { |
1177 | last_errno = errno; | |
1178 | error("there are still refs under '%s'", orig_ref); | |
1179 | goto error_return; | |
1180 | } | |
68db31cc | 1181 | ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type); |
bc7127ef | 1182 | } |
68db31cc SV |
1183 | if (type_p) |
1184 | *type_p = type; | |
ed378ec7 | 1185 | if (!ref) { |
5cc3cef9 | 1186 | last_errno = errno; |
818f477c | 1187 | error("unable to resolve reference %s: %s", |
ed378ec7 | 1188 | orig_ref, strerror(errno)); |
5cc3cef9 | 1189 | goto error_return; |
4bd18c43 | 1190 | } |
5bdd8d4a | 1191 | missing = is_null_sha1(lock->old_sha1); |
c976d415 LH |
1192 | /* When the ref did not exist and we are creating it, |
1193 | * make sure there is no existing ref that is packed | |
1194 | * whose name begins with our refname, nor a ref whose | |
1195 | * name is a proper prefix of our refname. | |
1196 | */ | |
5bdd8d4a | 1197 | if (missing && |
0bad611b | 1198 | !is_refname_available(ref, NULL, get_packed_refs(NULL), 0)) { |
f475e08e | 1199 | last_errno = ENOTDIR; |
c976d415 | 1200 | goto error_return; |
f475e08e | 1201 | } |
22a3844e | 1202 | |
c33d5174 | 1203 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 1204 | |
acd3b9ec JH |
1205 | lflags = LOCK_DIE_ON_ERROR; |
1206 | if (flags & REF_NODEREF) { | |
68db31cc | 1207 | ref = orig_ref; |
acd3b9ec JH |
1208 | lflags |= LOCK_NODEREF; |
1209 | } | |
434cd0cd | 1210 | lock->ref_name = xstrdup(ref); |
1655707c | 1211 | lock->orig_ref_name = xstrdup(orig_ref); |
7c1a278d | 1212 | ref_file = git_path("%s", ref); |
5bdd8d4a | 1213 | if (missing) |
68db31cc SV |
1214 | lock->force_write = 1; |
1215 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
1216 | lock->force_write = 1; | |
4bd18c43 | 1217 | |
5cc3cef9 JH |
1218 | if (safe_create_leading_directories(ref_file)) { |
1219 | last_errno = errno; | |
1220 | error("unable to create directory for %s", ref_file); | |
1221 | goto error_return; | |
1222 | } | |
4bd18c43 | 1223 | |
acd3b9ec | 1224 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags); |
4bd18c43 | 1225 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; |
5cc3cef9 JH |
1226 | |
1227 | error_return: | |
1228 | unlock_ref(lock); | |
1229 | errno = last_errno; | |
1230 | return NULL; | |
4bd18c43 SP |
1231 | } |
1232 | ||
4431fcc4 | 1233 | struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1) |
95fc7512 | 1234 | { |
53cce84c | 1235 | char refpath[PATH_MAX]; |
8d9c5010 | 1236 | if (check_refname_format(ref, 0)) |
4bd18c43 | 1237 | return NULL; |
53cce84c | 1238 | strcpy(refpath, mkpath("refs/%s", ref)); |
68db31cc | 1239 | return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL); |
4bd18c43 SP |
1240 | } |
1241 | ||
68db31cc | 1242 | struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags) |
4bd18c43 | 1243 | { |
8d9c5010 | 1244 | if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL)) |
257f3020 | 1245 | return NULL; |
8d9c5010 | 1246 | return lock_ref_sha1_basic(ref, old_sha1, flags, NULL); |
c0277d15 JH |
1247 | } |
1248 | ||
26a063a1 JH |
1249 | static struct lock_file packlock; |
1250 | ||
c0277d15 JH |
1251 | static int repack_without_ref(const char *refname) |
1252 | { | |
1253 | struct ref_list *list, *packed_ref_list; | |
1254 | int fd; | |
1255 | int found = 0; | |
c0277d15 | 1256 | |
0bad611b | 1257 | packed_ref_list = get_packed_refs(NULL); |
c0277d15 JH |
1258 | for (list = packed_ref_list; list; list = list->next) { |
1259 | if (!strcmp(refname, list->name)) { | |
1260 | found = 1; | |
1261 | break; | |
1262 | } | |
1263 | } | |
1264 | if (!found) | |
1265 | return 0; | |
c0277d15 | 1266 | fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0); |
1b018fd9 MV |
1267 | if (fd < 0) { |
1268 | unable_to_lock_error(git_path("packed-refs"), errno); | |
c0277d15 | 1269 | return error("cannot delete '%s' from packed refs", refname); |
1b018fd9 | 1270 | } |
c0277d15 JH |
1271 | |
1272 | for (list = packed_ref_list; list; list = list->next) { | |
1273 | char line[PATH_MAX + 100]; | |
1274 | int len; | |
1275 | ||
1276 | if (!strcmp(refname, list->name)) | |
1277 | continue; | |
1278 | len = snprintf(line, sizeof(line), "%s %s\n", | |
1279 | sha1_to_hex(list->sha1), list->name); | |
1280 | /* this should not happen but just being defensive */ | |
1281 | if (len > sizeof(line)) | |
1282 | die("too long a refname '%s'", list->name); | |
1283 | write_or_die(fd, line, len); | |
1284 | } | |
1285 | return commit_lock_file(&packlock); | |
1286 | } | |
1287 | ||
eca35a25 | 1288 | int delete_ref(const char *refname, const unsigned char *sha1, int delopt) |
c0277d15 JH |
1289 | { |
1290 | struct ref_lock *lock; | |
eca35a25 | 1291 | int err, i = 0, ret = 0, flag = 0; |
c0277d15 | 1292 | |
68db31cc | 1293 | lock = lock_ref_sha1_basic(refname, sha1, 0, &flag); |
c0277d15 JH |
1294 | if (!lock) |
1295 | return 1; | |
045a476f | 1296 | if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) { |
c0277d15 | 1297 | /* loose */ |
eca35a25 MV |
1298 | const char *path; |
1299 | ||
1300 | if (!(delopt & REF_NODEREF)) { | |
1301 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
1302 | lock->lk->filename[i] = 0; | |
1303 | path = lock->lk->filename; | |
1304 | } else { | |
9db56f71 | 1305 | path = git_path("%s", refname); |
eca35a25 | 1306 | } |
691f1a28 AR |
1307 | err = unlink_or_warn(path); |
1308 | if (err && errno != ENOENT) | |
c0277d15 | 1309 | ret = 1; |
691f1a28 | 1310 | |
eca35a25 MV |
1311 | if (!(delopt & REF_NODEREF)) |
1312 | lock->lk->filename[i] = '.'; | |
c0277d15 JH |
1313 | } |
1314 | /* removing the loose one could have resurrected an earlier | |
1315 | * packed one. Also, if it was not loose we need to repack | |
1316 | * without it. | |
1317 | */ | |
1318 | ret |= repack_without_ref(refname); | |
1319 | ||
691f1a28 | 1320 | unlink_or_warn(git_path("logs/%s", lock->ref_name)); |
c0277d15 JH |
1321 | invalidate_cached_refs(); |
1322 | unlock_ref(lock); | |
1323 | return ret; | |
4bd18c43 SP |
1324 | } |
1325 | ||
765c2258 PH |
1326 | /* |
1327 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
1328 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
1329 | * | |
1330 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
1331 | * live into logs/refs. | |
1332 | */ | |
1333 | #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log" | |
1334 | ||
678d0f4c | 1335 | int rename_ref(const char *oldref, const char *newref, const char *logmsg) |
c976d415 LH |
1336 | { |
1337 | static const char renamed_ref[] = "RENAMED-REF"; | |
1338 | unsigned char sha1[20], orig_sha1[20]; | |
1339 | int flag = 0, logmoved = 0; | |
1340 | struct ref_lock *lock; | |
c976d415 | 1341 | struct stat loginfo; |
16c2bfbb | 1342 | int log = !lstat(git_path("logs/%s", oldref), &loginfo); |
eca35a25 | 1343 | const char *symref = NULL; |
c976d415 | 1344 | |
450d4c0f | 1345 | if (log && S_ISLNK(loginfo.st_mode)) |
c976d415 LH |
1346 | return error("reflog for %s is a symlink", oldref); |
1347 | ||
eca35a25 MV |
1348 | symref = resolve_ref(oldref, orig_sha1, 1, &flag); |
1349 | if (flag & REF_ISSYMREF) | |
fa58186c MV |
1350 | return error("refname %s is a symbolic ref, renaming it is not supported", |
1351 | oldref); | |
eca35a25 | 1352 | if (!symref) |
c976d415 LH |
1353 | return error("refname %s not found", oldref); |
1354 | ||
0bad611b | 1355 | if (!is_refname_available(newref, oldref, get_packed_refs(NULL), 0)) |
c976d415 LH |
1356 | return 1; |
1357 | ||
0bad611b | 1358 | if (!is_refname_available(newref, oldref, get_loose_refs(NULL), 0)) |
c976d415 LH |
1359 | return 1; |
1360 | ||
68db31cc | 1361 | lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL); |
c976d415 LH |
1362 | if (!lock) |
1363 | return error("unable to lock %s", renamed_ref); | |
1364 | lock->force_write = 1; | |
678d0f4c | 1365 | if (write_ref_sha1(lock, orig_sha1, logmsg)) |
c976d415 LH |
1366 | return error("unable to save current sha1 in %s", renamed_ref); |
1367 | ||
765c2258 PH |
1368 | if (log && rename(git_path("logs/%s", oldref), git_path(TMP_RENAMED_LOG))) |
1369 | return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s", | |
c976d415 LH |
1370 | oldref, strerror(errno)); |
1371 | ||
eca35a25 | 1372 | if (delete_ref(oldref, orig_sha1, REF_NODEREF)) { |
c976d415 LH |
1373 | error("unable to delete old %s", oldref); |
1374 | goto rollback; | |
1375 | } | |
1376 | ||
eca35a25 | 1377 | if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1, REF_NODEREF)) { |
c976d415 LH |
1378 | if (errno==EISDIR) { |
1379 | if (remove_empty_directories(git_path("%s", newref))) { | |
1380 | error("Directory not empty: %s", newref); | |
1381 | goto rollback; | |
1382 | } | |
1383 | } else { | |
1384 | error("unable to delete existing %s", newref); | |
1385 | goto rollback; | |
1386 | } | |
1387 | } | |
1388 | ||
1389 | if (log && safe_create_leading_directories(git_path("logs/%s", newref))) { | |
1390 | error("unable to create directory for %s", newref); | |
1391 | goto rollback; | |
1392 | } | |
1393 | ||
1394 | retry: | |
765c2258 | 1395 | if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newref))) { |
d9e74d57 JR |
1396 | if (errno==EISDIR || errno==ENOTDIR) { |
1397 | /* | |
1398 | * rename(a, b) when b is an existing | |
1399 | * directory ought to result in ISDIR, but | |
1400 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
1401 | */ | |
c976d415 LH |
1402 | if (remove_empty_directories(git_path("logs/%s", newref))) { |
1403 | error("Directory not empty: logs/%s", newref); | |
1404 | goto rollback; | |
1405 | } | |
1406 | goto retry; | |
1407 | } else { | |
765c2258 | 1408 | error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s", |
c976d415 LH |
1409 | newref, strerror(errno)); |
1410 | goto rollback; | |
1411 | } | |
1412 | } | |
1413 | logmoved = log; | |
1414 | ||
68db31cc | 1415 | lock = lock_ref_sha1_basic(newref, NULL, 0, NULL); |
c976d415 LH |
1416 | if (!lock) { |
1417 | error("unable to lock %s for update", newref); | |
1418 | goto rollback; | |
1419 | } | |
c976d415 LH |
1420 | lock->force_write = 1; |
1421 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 1422 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
c976d415 LH |
1423 | error("unable to write current sha1 into %s", newref); |
1424 | goto rollback; | |
1425 | } | |
1426 | ||
1427 | return 0; | |
1428 | ||
1429 | rollback: | |
68db31cc | 1430 | lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL); |
c976d415 LH |
1431 | if (!lock) { |
1432 | error("unable to lock %s for rollback", oldref); | |
1433 | goto rollbacklog; | |
1434 | } | |
1435 | ||
1436 | lock->force_write = 1; | |
1437 | flag = log_all_ref_updates; | |
1438 | log_all_ref_updates = 0; | |
1439 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
1440 | error("unable to write current sha1 into %s", oldref); | |
1441 | log_all_ref_updates = flag; | |
1442 | ||
1443 | rollbacklog: | |
1444 | if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref))) | |
1445 | error("unable to restore logfile %s from %s: %s", | |
1446 | oldref, newref, strerror(errno)); | |
1447 | if (!logmoved && log && | |
765c2258 PH |
1448 | rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldref))) |
1449 | error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s", | |
c976d415 LH |
1450 | oldref, strerror(errno)); |
1451 | ||
1452 | return 1; | |
1453 | } | |
1454 | ||
435fc852 | 1455 | int close_ref(struct ref_lock *lock) |
b531394d BC |
1456 | { |
1457 | if (close_lock_file(lock->lk)) | |
1458 | return -1; | |
1459 | lock->lock_fd = -1; | |
1460 | return 0; | |
1461 | } | |
1462 | ||
435fc852 | 1463 | int commit_ref(struct ref_lock *lock) |
b531394d BC |
1464 | { |
1465 | if (commit_lock_file(lock->lk)) | |
1466 | return -1; | |
1467 | lock->lock_fd = -1; | |
1468 | return 0; | |
1469 | } | |
1470 | ||
e5f38ec3 | 1471 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 | 1472 | { |
4ed7cd3a BC |
1473 | /* Do not free lock->lk -- atexit() still looks at them */ |
1474 | if (lock->lk) | |
1475 | rollback_lock_file(lock->lk); | |
434cd0cd | 1476 | free(lock->ref_name); |
1655707c | 1477 | free(lock->orig_ref_name); |
4bd18c43 SP |
1478 | free(lock); |
1479 | } | |
1480 | ||
0ec29a47 JH |
1481 | /* |
1482 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
1483 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
1484 | * because reflog file is one line per entry. | |
1485 | */ | |
1486 | static int copy_msg(char *buf, const char *msg) | |
1487 | { | |
1488 | char *cp = buf; | |
1489 | char c; | |
1490 | int wasspace = 1; | |
1491 | ||
1492 | *cp++ = '\t'; | |
1493 | while ((c = *msg++)) { | |
1494 | if (wasspace && isspace(c)) | |
1495 | continue; | |
1496 | wasspace = isspace(c); | |
1497 | if (wasspace) | |
1498 | c = ' '; | |
1499 | *cp++ = c; | |
1500 | } | |
1501 | while (buf < cp && isspace(cp[-1])) | |
1502 | cp--; | |
1503 | *cp++ = '\n'; | |
1504 | return cp - buf; | |
1505 | } | |
1506 | ||
157aaea5 | 1507 | int log_ref_setup(const char *ref_name, char *logfile, int bufsize) |
6de08ae6 | 1508 | { |
859c3017 | 1509 | int logfd, oflags = O_APPEND | O_WRONLY; |
9a13f0b7 | 1510 | |
157aaea5 | 1511 | git_snpath(logfile, bufsize, "logs/%s", ref_name); |
4057deb5 | 1512 | if (log_all_ref_updates && |
cc44c765 JH |
1513 | (!prefixcmp(ref_name, "refs/heads/") || |
1514 | !prefixcmp(ref_name, "refs/remotes/") || | |
b2e256b0 | 1515 | !prefixcmp(ref_name, "refs/notes/") || |
bd104db1 | 1516 | !strcmp(ref_name, "HEAD"))) { |
157aaea5 | 1517 | if (safe_create_leading_directories(logfile) < 0) |
6de08ae6 | 1518 | return error("unable to create directory for %s", |
157aaea5 | 1519 | logfile); |
6de08ae6 SP |
1520 | oflags |= O_CREAT; |
1521 | } | |
1522 | ||
157aaea5 | 1523 | logfd = open(logfile, oflags, 0666); |
6de08ae6 | 1524 | if (logfd < 0) { |
1974bf62 | 1525 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 1526 | return 0; |
3b463c3f JH |
1527 | |
1528 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
157aaea5 | 1529 | if (remove_empty_directories(logfile)) { |
3b463c3f | 1530 | return error("There are still logs under '%s'", |
157aaea5 | 1531 | logfile); |
3b463c3f | 1532 | } |
157aaea5 | 1533 | logfd = open(logfile, oflags, 0666); |
3b463c3f JH |
1534 | } |
1535 | ||
1536 | if (logfd < 0) | |
1537 | return error("Unable to append to %s: %s", | |
157aaea5 | 1538 | logfile, strerror(errno)); |
6de08ae6 SP |
1539 | } |
1540 | ||
157aaea5 | 1541 | adjust_shared_perm(logfile); |
859c3017 EM |
1542 | close(logfd); |
1543 | return 0; | |
1544 | } | |
443b92b6 | 1545 | |
859c3017 EM |
1546 | static int log_ref_write(const char *ref_name, const unsigned char *old_sha1, |
1547 | const unsigned char *new_sha1, const char *msg) | |
1548 | { | |
1549 | int logfd, result, written, oflags = O_APPEND | O_WRONLY; | |
1550 | unsigned maxlen, len; | |
1551 | int msglen; | |
157aaea5 | 1552 | char log_file[PATH_MAX]; |
859c3017 EM |
1553 | char *logrec; |
1554 | const char *committer; | |
1555 | ||
1556 | if (log_all_ref_updates < 0) | |
1557 | log_all_ref_updates = !is_bare_repository(); | |
1558 | ||
157aaea5 | 1559 | result = log_ref_setup(ref_name, log_file, sizeof(log_file)); |
859c3017 EM |
1560 | if (result) |
1561 | return result; | |
1562 | ||
1563 | logfd = open(log_file, oflags); | |
1564 | if (logfd < 0) | |
1565 | return 0; | |
0ec29a47 | 1566 | msglen = msg ? strlen(msg) : 0; |
774751a8 | 1567 | committer = git_committer_info(0); |
8ac65937 JH |
1568 | maxlen = strlen(committer) + msglen + 100; |
1569 | logrec = xmalloc(maxlen); | |
1570 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
1571 | sha1_to_hex(old_sha1), |
1572 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
1573 | committer); |
1574 | if (msglen) | |
0ec29a47 | 1575 | len += copy_msg(logrec + len - 1, msg) - 1; |
93822c22 | 1576 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 | 1577 | free(logrec); |
91c8d590 | 1578 | if (close(logfd) != 0 || written != len) |
9a13f0b7 | 1579 | return error("Unable to append to %s", log_file); |
6de08ae6 SP |
1580 | return 0; |
1581 | } | |
1582 | ||
c3b0dec5 LT |
1583 | static int is_branch(const char *refname) |
1584 | { | |
1585 | return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/"); | |
1586 | } | |
1587 | ||
4bd18c43 SP |
1588 | int write_ref_sha1(struct ref_lock *lock, |
1589 | const unsigned char *sha1, const char *logmsg) | |
1590 | { | |
1591 | static char term = '\n'; | |
c3b0dec5 | 1592 | struct object *o; |
4bd18c43 SP |
1593 | |
1594 | if (!lock) | |
95fc7512 | 1595 | return -1; |
a89fccd2 | 1596 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
1597 | unlock_ref(lock); |
1598 | return 0; | |
95fc7512 | 1599 | } |
c3b0dec5 LT |
1600 | o = parse_object(sha1); |
1601 | if (!o) { | |
7be8b3ba | 1602 | error("Trying to write ref %s with nonexistent object %s", |
c3b0dec5 LT |
1603 | lock->ref_name, sha1_to_hex(sha1)); |
1604 | unlock_ref(lock); | |
1605 | return -1; | |
1606 | } | |
1607 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1608 | error("Trying to write non-commit object %s to branch %s", | |
1609 | sha1_to_hex(sha1), lock->ref_name); | |
1610 | unlock_ref(lock); | |
1611 | return -1; | |
1612 | } | |
93822c22 AW |
1613 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
1614 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
b531394d | 1615 | || close_ref(lock) < 0) { |
c33d5174 | 1616 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
1617 | unlock_ref(lock); |
1618 | return -1; | |
1619 | } | |
5e290ff7 | 1620 | invalidate_cached_refs(); |
bd104db1 NP |
1621 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
1622 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
1623 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
1624 | unlock_ref(lock); |
1625 | return -1; | |
1626 | } | |
605fac8b NP |
1627 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
1628 | /* | |
1629 | * Special hack: If a branch is updated directly and HEAD | |
1630 | * points to it (may happen on the remote side of a push | |
1631 | * for example) then logically the HEAD reflog should be | |
1632 | * updated too. | |
1633 | * A generic solution implies reverse symref information, | |
1634 | * but finding all symrefs pointing to the given branch | |
1635 | * would be rather costly for this rare event (the direct | |
1636 | * update of a branch) to be worth it. So let's cheat and | |
1637 | * check with HEAD only which should cover 99% of all usage | |
1638 | * scenarios (even 100% of the default ones). | |
1639 | */ | |
1640 | unsigned char head_sha1[20]; | |
1641 | int head_flag; | |
1642 | const char *head_ref; | |
1643 | head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag); | |
1644 | if (head_ref && (head_flag & REF_ISSYMREF) && | |
1645 | !strcmp(head_ref, lock->ref_name)) | |
1646 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
1647 | } | |
b531394d | 1648 | if (commit_ref(lock)) { |
434cd0cd | 1649 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
1650 | unlock_ref(lock); |
1651 | return -1; | |
1652 | } | |
4bd18c43 SP |
1653 | unlock_ref(lock); |
1654 | return 0; | |
95fc7512 | 1655 | } |
d556fae2 | 1656 | |
8b5157e4 NP |
1657 | int create_symref(const char *ref_target, const char *refs_heads_master, |
1658 | const char *logmsg) | |
41b625b0 NP |
1659 | { |
1660 | const char *lockpath; | |
1661 | char ref[1000]; | |
1662 | int fd, len, written; | |
a4f34cbb | 1663 | char *git_HEAD = git_pathdup("%s", ref_target); |
8b5157e4 NP |
1664 | unsigned char old_sha1[20], new_sha1[20]; |
1665 | ||
1666 | if (logmsg && read_ref(ref_target, old_sha1)) | |
1667 | hashclr(old_sha1); | |
41b625b0 | 1668 | |
d48744d1 JH |
1669 | if (safe_create_leading_directories(git_HEAD) < 0) |
1670 | return error("unable to create directory for %s", git_HEAD); | |
1671 | ||
41b625b0 NP |
1672 | #ifndef NO_SYMLINK_HEAD |
1673 | if (prefer_symlink_refs) { | |
1674 | unlink(git_HEAD); | |
1675 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 1676 | goto done; |
41b625b0 NP |
1677 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
1678 | } | |
1679 | #endif | |
1680 | ||
1681 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
1682 | if (sizeof(ref) <= len) { | |
1683 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 1684 | goto error_free_return; |
41b625b0 NP |
1685 | } |
1686 | lockpath = mkpath("%s.lock", git_HEAD); | |
1687 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
1688 | if (fd < 0) { | |
1689 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 1690 | goto error_free_return; |
41b625b0 NP |
1691 | } |
1692 | written = write_in_full(fd, ref, len); | |
91c8d590 | 1693 | if (close(fd) != 0 || written != len) { |
41b625b0 | 1694 | error("Unable to write to %s", lockpath); |
47fc52e2 | 1695 | goto error_unlink_return; |
41b625b0 NP |
1696 | } |
1697 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 1698 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 1699 | goto error_unlink_return; |
41b625b0 NP |
1700 | } |
1701 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 1702 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 | 1703 | error_unlink_return: |
691f1a28 | 1704 | unlink_or_warn(lockpath); |
47fc52e2 JH |
1705 | error_free_return: |
1706 | free(git_HEAD); | |
1707 | return -1; | |
41b625b0 | 1708 | } |
8b5157e4 | 1709 | |
ee96d11b | 1710 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 1711 | done: |
ee96d11b | 1712 | #endif |
8b5157e4 NP |
1713 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
1714 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
1715 | ||
47fc52e2 | 1716 | free(git_HEAD); |
41b625b0 NP |
1717 | return 0; |
1718 | } | |
1719 | ||
16d7cc90 JH |
1720 | static char *ref_msg(const char *line, const char *endp) |
1721 | { | |
1722 | const char *ep; | |
16d7cc90 | 1723 | line += 82; |
182af834 PH |
1724 | ep = memchr(line, '\n', endp - line); |
1725 | if (!ep) | |
1726 | ep = endp; | |
1727 | return xmemdupz(line, ep - line); | |
16d7cc90 JH |
1728 | } |
1729 | ||
1730 | 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 | 1731 | { |
e5229042 | 1732 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 | 1733 | char *tz_c; |
e29cb53a | 1734 | int logfd, tz, reccnt = 0; |
d556fae2 SP |
1735 | struct stat st; |
1736 | unsigned long date; | |
e5229042 | 1737 | unsigned char logged_sha1[20]; |
cb48cb58 | 1738 | void *log_mapped; |
dc49cd76 | 1739 | size_t mapsz; |
d556fae2 SP |
1740 | |
1741 | logfile = git_path("logs/%s", ref); | |
1742 | logfd = open(logfile, O_RDONLY, 0); | |
1743 | if (logfd < 0) | |
d824cbba | 1744 | die_errno("Unable to read log '%s'", logfile); |
d556fae2 SP |
1745 | fstat(logfd, &st); |
1746 | if (!st.st_size) | |
1747 | die("Log %s is empty.", logfile); | |
dc49cd76 SP |
1748 | mapsz = xsize_t(st.st_size); |
1749 | log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0); | |
cb48cb58 | 1750 | logdata = log_mapped; |
d556fae2 SP |
1751 | close(logfd); |
1752 | ||
e5229042 | 1753 | lastrec = NULL; |
d556fae2 SP |
1754 | rec = logend = logdata + st.st_size; |
1755 | while (logdata < rec) { | |
e29cb53a | 1756 | reccnt++; |
d556fae2 SP |
1757 | if (logdata < rec && *(rec-1) == '\n') |
1758 | rec--; | |
e5229042 SP |
1759 | lastgt = NULL; |
1760 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 1761 | rec--; |
e5229042 SP |
1762 | if (*rec == '>') |
1763 | lastgt = rec; | |
1764 | } | |
1765 | if (!lastgt) | |
d556fae2 | 1766 | die("Log %s is corrupt.", logfile); |
e5229042 | 1767 | date = strtoul(lastgt + 1, &tz_c, 10); |
ab2a1a32 | 1768 | if (date <= at_time || cnt == 0) { |
76a44c5c | 1769 | tz = strtoul(tz_c, NULL, 10); |
16d7cc90 JH |
1770 | if (msg) |
1771 | *msg = ref_msg(rec, logend); | |
1772 | if (cutoff_time) | |
1773 | *cutoff_time = date; | |
1774 | if (cutoff_tz) | |
1775 | *cutoff_tz = tz; | |
1776 | if (cutoff_cnt) | |
76a44c5c | 1777 | *cutoff_cnt = reccnt - 1; |
e5229042 SP |
1778 | if (lastrec) { |
1779 | if (get_sha1_hex(lastrec, logged_sha1)) | |
1780 | die("Log %s is corrupt.", logfile); | |
1781 | if (get_sha1_hex(rec + 41, sha1)) | |
1782 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1783 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1784 | warning("Log %s has gap after %s.", |
73013afd | 1785 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 | 1786 | } |
e5f38ec3 JH |
1787 | } |
1788 | else if (date == at_time) { | |
e5229042 SP |
1789 | if (get_sha1_hex(rec + 41, sha1)) |
1790 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
1791 | } |
1792 | else { | |
e5229042 SP |
1793 | if (get_sha1_hex(rec + 41, logged_sha1)) |
1794 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1795 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1796 | warning("Log %s unexpectedly ended on %s.", |
73013afd | 1797 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 SP |
1798 | } |
1799 | } | |
dc49cd76 | 1800 | munmap(log_mapped, mapsz); |
d556fae2 SP |
1801 | return 0; |
1802 | } | |
e5229042 | 1803 | lastrec = rec; |
ab2a1a32 JH |
1804 | if (cnt > 0) |
1805 | cnt--; | |
d556fae2 SP |
1806 | } |
1807 | ||
e5229042 SP |
1808 | rec = logdata; |
1809 | while (rec < logend && *rec != '>' && *rec != '\n') | |
1810 | rec++; | |
1811 | if (rec == logend || *rec == '\n') | |
d556fae2 | 1812 | die("Log %s is corrupt.", logfile); |
e5229042 | 1813 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
1814 | tz = strtoul(tz_c, NULL, 10); |
1815 | if (get_sha1_hex(logdata, sha1)) | |
1816 | die("Log %s is corrupt.", logfile); | |
d1a4489a JK |
1817 | if (is_null_sha1(sha1)) { |
1818 | if (get_sha1_hex(logdata + 41, sha1)) | |
1819 | die("Log %s is corrupt.", logfile); | |
1820 | } | |
16d7cc90 JH |
1821 | if (msg) |
1822 | *msg = ref_msg(logdata, logend); | |
dc49cd76 | 1823 | munmap(log_mapped, mapsz); |
16d7cc90 JH |
1824 | |
1825 | if (cutoff_time) | |
1826 | *cutoff_time = date; | |
1827 | if (cutoff_tz) | |
1828 | *cutoff_tz = tz; | |
1829 | if (cutoff_cnt) | |
1830 | *cutoff_cnt = reccnt; | |
1831 | return 1; | |
d556fae2 | 1832 | } |
2ff81662 | 1833 | |
101d15e0 | 1834 | int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long ofs, void *cb_data) |
2ff81662 JH |
1835 | { |
1836 | const char *logfile; | |
1837 | FILE *logfp; | |
8ca78803 | 1838 | struct strbuf sb = STRBUF_INIT; |
2266bf27 | 1839 | int ret = 0; |
2ff81662 JH |
1840 | |
1841 | logfile = git_path("logs/%s", ref); | |
1842 | logfp = fopen(logfile, "r"); | |
1843 | if (!logfp) | |
883d60fa | 1844 | return -1; |
101d15e0 JH |
1845 | |
1846 | if (ofs) { | |
1847 | struct stat statbuf; | |
1848 | if (fstat(fileno(logfp), &statbuf) || | |
1849 | statbuf.st_size < ofs || | |
1850 | fseek(logfp, -ofs, SEEK_END) || | |
8ca78803 | 1851 | strbuf_getwholeline(&sb, logfp, '\n')) { |
9d33f7c2 | 1852 | fclose(logfp); |
8ca78803 | 1853 | strbuf_release(&sb); |
101d15e0 | 1854 | return -1; |
9d33f7c2 | 1855 | } |
101d15e0 JH |
1856 | } |
1857 | ||
8ca78803 | 1858 | while (!strbuf_getwholeline(&sb, logfp, '\n')) { |
2ff81662 | 1859 | unsigned char osha1[20], nsha1[20]; |
883d60fa JS |
1860 | char *email_end, *message; |
1861 | unsigned long timestamp; | |
8ca78803 | 1862 | int tz; |
2ff81662 JH |
1863 | |
1864 | /* old SP new SP name <email> SP time TAB msg LF */ | |
8ca78803 RS |
1865 | if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' || |
1866 | get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' || | |
1867 | get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' || | |
1868 | !(email_end = strchr(sb.buf + 82, '>')) || | |
883d60fa JS |
1869 | email_end[1] != ' ' || |
1870 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
1871 | !message || message[0] != ' ' || | |
1872 | (message[1] != '+' && message[1] != '-') || | |
1873 | !isdigit(message[2]) || !isdigit(message[3]) || | |
b4dd4856 | 1874 | !isdigit(message[4]) || !isdigit(message[5])) |
2ff81662 | 1875 | continue; /* corrupt? */ |
883d60fa JS |
1876 | email_end[1] = '\0'; |
1877 | tz = strtol(message + 1, NULL, 10); | |
b4dd4856 JS |
1878 | if (message[6] != '\t') |
1879 | message += 6; | |
1880 | else | |
1881 | message += 7; | |
8ca78803 RS |
1882 | ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message, |
1883 | cb_data); | |
883d60fa | 1884 | if (ret) |
2266bf27 | 1885 | break; |
2ff81662 JH |
1886 | } |
1887 | fclose(logfp); | |
8ca78803 | 1888 | strbuf_release(&sb); |
2266bf27 | 1889 | return ret; |
2ff81662 | 1890 | } |
e29cb53a | 1891 | |
101d15e0 JH |
1892 | int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data) |
1893 | { | |
1894 | return for_each_recent_reflog_ent(ref, fn, 0, cb_data); | |
1895 | } | |
1896 | ||
eb8381c8 NP |
1897 | static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data) |
1898 | { | |
1899 | DIR *dir = opendir(git_path("logs/%s", base)); | |
fcee5a14 | 1900 | int retval = 0; |
eb8381c8 NP |
1901 | |
1902 | if (dir) { | |
1903 | struct dirent *de; | |
1904 | int baselen = strlen(base); | |
1905 | char *log = xmalloc(baselen + 257); | |
1906 | ||
1907 | memcpy(log, base, baselen); | |
1908 | if (baselen && base[baselen-1] != '/') | |
1909 | log[baselen++] = '/'; | |
1910 | ||
1911 | while ((de = readdir(dir)) != NULL) { | |
1912 | struct stat st; | |
1913 | int namelen; | |
1914 | ||
1915 | if (de->d_name[0] == '.') | |
1916 | continue; | |
1917 | namelen = strlen(de->d_name); | |
1918 | if (namelen > 255) | |
1919 | continue; | |
1920 | if (has_extension(de->d_name, ".lock")) | |
1921 | continue; | |
1922 | memcpy(log + baselen, de->d_name, namelen+1); | |
1923 | if (stat(git_path("logs/%s", log), &st) < 0) | |
1924 | continue; | |
1925 | if (S_ISDIR(st.st_mode)) { | |
1926 | retval = do_for_each_reflog(log, fn, cb_data); | |
1927 | } else { | |
1928 | unsigned char sha1[20]; | |
1929 | if (!resolve_ref(log, sha1, 0, NULL)) | |
1930 | retval = error("bad ref for %s", log); | |
1931 | else | |
1932 | retval = fn(log, sha1, 0, cb_data); | |
1933 | } | |
1934 | if (retval) | |
1935 | break; | |
1936 | } | |
1937 | free(log); | |
1938 | closedir(dir); | |
1939 | } | |
acb39f64 | 1940 | else if (*base) |
fcee5a14 | 1941 | return errno; |
eb8381c8 NP |
1942 | return retval; |
1943 | } | |
1944 | ||
1945 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
1946 | { | |
1947 | return do_for_each_reflog("", fn, cb_data); | |
1948 | } | |
3d9f037c CR |
1949 | |
1950 | int update_ref(const char *action, const char *refname, | |
1951 | const unsigned char *sha1, const unsigned char *oldval, | |
1952 | int flags, enum action_on_err onerr) | |
1953 | { | |
1954 | static struct ref_lock *lock; | |
1955 | lock = lock_any_ref_for_update(refname, oldval, flags); | |
1956 | if (!lock) { | |
1957 | const char *str = "Cannot lock the ref '%s'."; | |
1958 | switch (onerr) { | |
1959 | case MSG_ON_ERR: error(str, refname); break; | |
1960 | case DIE_ON_ERR: die(str, refname); break; | |
1961 | case QUIET_ON_ERR: break; | |
1962 | } | |
1963 | return 1; | |
1964 | } | |
1965 | if (write_ref_sha1(lock, sha1, action) < 0) { | |
1966 | const char *str = "Cannot update the ref '%s'."; | |
1967 | switch (onerr) { | |
1968 | case MSG_ON_ERR: error(str, refname); break; | |
1969 | case DIE_ON_ERR: die(str, refname); break; | |
1970 | case QUIET_ON_ERR: break; | |
1971 | } | |
1972 | return 1; | |
1973 | } | |
1974 | return 0; | |
1975 | } | |
cda69f48 | 1976 | |
c17b2294 JH |
1977 | int ref_exists(char *refname) |
1978 | { | |
1979 | unsigned char sha1[20]; | |
1980 | return !!resolve_ref(refname, sha1, 1, NULL); | |
1981 | } | |
1982 | ||
5483f799 | 1983 | struct ref *find_ref_by_name(const struct ref *list, const char *name) |
cda69f48 JK |
1984 | { |
1985 | for ( ; list; list = list->next) | |
1986 | if (!strcmp(list->name, name)) | |
5483f799 | 1987 | return (struct ref *)list; |
cda69f48 JK |
1988 | return NULL; |
1989 | } | |
7c2b3029 JK |
1990 | |
1991 | /* | |
1992 | * generate a format suitable for scanf from a ref_rev_parse_rules | |
1993 | * rule, that is replace the "%.*s" spec with a "%s" spec | |
1994 | */ | |
1995 | static void gen_scanf_fmt(char *scanf_fmt, const char *rule) | |
1996 | { | |
1997 | char *spec; | |
1998 | ||
1999 | spec = strstr(rule, "%.*s"); | |
2000 | if (!spec || strstr(spec + 4, "%.*s")) | |
2001 | die("invalid rule in ref_rev_parse_rules: %s", rule); | |
2002 | ||
2003 | /* copy all until spec */ | |
2004 | strncpy(scanf_fmt, rule, spec - rule); | |
2005 | scanf_fmt[spec - rule] = '\0'; | |
2006 | /* copy new spec */ | |
2007 | strcat(scanf_fmt, "%s"); | |
2008 | /* copy remaining rule */ | |
2009 | strcat(scanf_fmt, spec + 4); | |
2010 | ||
2011 | return; | |
2012 | } | |
2013 | ||
6e7b3309 | 2014 | char *shorten_unambiguous_ref(const char *ref, int strict) |
7c2b3029 JK |
2015 | { |
2016 | int i; | |
2017 | static char **scanf_fmts; | |
2018 | static int nr_rules; | |
2019 | char *short_name; | |
2020 | ||
2021 | /* pre generate scanf formats from ref_rev_parse_rules[] */ | |
2022 | if (!nr_rules) { | |
2023 | size_t total_len = 0; | |
2024 | ||
2025 | /* the rule list is NULL terminated, count them first */ | |
2026 | for (; ref_rev_parse_rules[nr_rules]; nr_rules++) | |
2027 | /* no +1 because strlen("%s") < strlen("%.*s") */ | |
2028 | total_len += strlen(ref_rev_parse_rules[nr_rules]); | |
2029 | ||
2030 | scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len); | |
2031 | ||
2032 | total_len = 0; | |
2033 | for (i = 0; i < nr_rules; i++) { | |
2034 | scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] | |
2035 | + total_len; | |
2036 | gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]); | |
2037 | total_len += strlen(ref_rev_parse_rules[i]); | |
2038 | } | |
2039 | } | |
2040 | ||
2041 | /* bail out if there are no rules */ | |
2042 | if (!nr_rules) | |
2043 | return xstrdup(ref); | |
2044 | ||
2045 | /* buffer for scanf result, at most ref must fit */ | |
2046 | short_name = xstrdup(ref); | |
2047 | ||
2048 | /* skip first rule, it will always match */ | |
2049 | for (i = nr_rules - 1; i > 0 ; --i) { | |
2050 | int j; | |
6e7b3309 | 2051 | int rules_to_fail = i; |
7c2b3029 JK |
2052 | int short_name_len; |
2053 | ||
2054 | if (1 != sscanf(ref, scanf_fmts[i], short_name)) | |
2055 | continue; | |
2056 | ||
2057 | short_name_len = strlen(short_name); | |
2058 | ||
6e7b3309 BW |
2059 | /* |
2060 | * in strict mode, all (except the matched one) rules | |
2061 | * must fail to resolve to a valid non-ambiguous ref | |
2062 | */ | |
2063 | if (strict) | |
2064 | rules_to_fail = nr_rules; | |
2065 | ||
7c2b3029 JK |
2066 | /* |
2067 | * check if the short name resolves to a valid ref, | |
2068 | * but use only rules prior to the matched one | |
2069 | */ | |
6e7b3309 | 2070 | for (j = 0; j < rules_to_fail; j++) { |
7c2b3029 JK |
2071 | const char *rule = ref_rev_parse_rules[j]; |
2072 | unsigned char short_objectname[20]; | |
2073 | char refname[PATH_MAX]; | |
2074 | ||
6e7b3309 BW |
2075 | /* skip matched rule */ |
2076 | if (i == j) | |
2077 | continue; | |
2078 | ||
7c2b3029 JK |
2079 | /* |
2080 | * the short name is ambiguous, if it resolves | |
2081 | * (with this previous rule) to a valid ref | |
2082 | * read_ref() returns 0 on success | |
2083 | */ | |
2084 | mksnpath(refname, sizeof(refname), | |
2085 | rule, short_name_len, short_name); | |
2086 | if (!read_ref(refname, short_objectname)) | |
2087 | break; | |
2088 | } | |
2089 | ||
2090 | /* | |
2091 | * short name is non-ambiguous if all previous rules | |
2092 | * haven't resolved to a valid ref | |
2093 | */ | |
6e7b3309 | 2094 | if (j == rules_to_fail) |
7c2b3029 JK |
2095 | return short_name; |
2096 | } | |
2097 | ||
2098 | free(short_name); | |
2099 | return xstrdup(ref); | |
2100 | } |