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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); |
e1e22e37 | 59 | memcpy(entry->name, name, len); |
8da19775 | 60 | entry->flag = flag; |
c774aab9 | 61 | entry->next = list; |
f4204ab9 JH |
62 | if (new_entry) |
63 | *new_entry = entry; | |
c774aab9 JP |
64 | return entry; |
65 | } | |
66 | ||
67 | /* merge sort the ref list */ | |
68 | static struct ref_list *sort_ref_list(struct ref_list *list) | |
69 | { | |
70 | int psize, qsize, last_merge_count, cmp; | |
71 | struct ref_list *p, *q, *l, *e; | |
72 | struct ref_list *new_list = list; | |
73 | int k = 1; | |
74 | int merge_count = 0; | |
75 | ||
76 | if (!list) | |
77 | return list; | |
78 | ||
79 | do { | |
80 | last_merge_count = merge_count; | |
81 | merge_count = 0; | |
82 | ||
83 | psize = 0; | |
84 | ||
85 | p = new_list; | |
86 | q = new_list; | |
87 | new_list = NULL; | |
88 | l = NULL; | |
89 | ||
90 | while (p) { | |
91 | merge_count++; | |
92 | ||
93 | while (psize < k && q->next) { | |
94 | q = q->next; | |
95 | psize++; | |
96 | } | |
97 | qsize = k; | |
98 | ||
99 | while ((psize > 0) || (qsize > 0 && q)) { | |
100 | if (qsize == 0 || !q) { | |
101 | e = p; | |
102 | p = p->next; | |
103 | psize--; | |
104 | } else if (psize == 0) { | |
105 | e = q; | |
106 | q = q->next; | |
107 | qsize--; | |
108 | } else { | |
109 | cmp = strcmp(q->name, p->name); | |
110 | if (cmp < 0) { | |
111 | e = q; | |
112 | q = q->next; | |
113 | qsize--; | |
114 | } else if (cmp > 0) { | |
115 | e = p; | |
116 | p = p->next; | |
117 | psize--; | |
118 | } else { | |
119 | if (hashcmp(q->sha1, p->sha1)) | |
120 | die("Duplicated ref, and SHA1s don't match: %s", | |
121 | q->name); | |
122 | warning("Duplicated ref: %s", q->name); | |
123 | e = q; | |
124 | q = q->next; | |
125 | qsize--; | |
126 | free(e); | |
127 | e = p; | |
128 | p = p->next; | |
129 | psize--; | |
130 | } | |
131 | } | |
132 | ||
133 | e->next = NULL; | |
134 | ||
135 | if (l) | |
136 | l->next = e; | |
137 | if (!new_list) | |
138 | new_list = e; | |
139 | l = e; | |
140 | } | |
141 | ||
142 | p = q; | |
143 | }; | |
144 | ||
145 | k = k * 2; | |
146 | } while ((last_merge_count != merge_count) || (last_merge_count != 1)); | |
147 | ||
148 | return new_list; | |
e1e22e37 LT |
149 | } |
150 | ||
5e290ff7 JH |
151 | /* |
152 | * Future: need to be in "struct repository" | |
153 | * when doing a full libification. | |
154 | */ | |
4175e9e3 | 155 | static struct cached_refs { |
5e290ff7 JH |
156 | char did_loose; |
157 | char did_packed; | |
158 | struct ref_list *loose; | |
159 | struct ref_list *packed; | |
0bad611b | 160 | } cached_refs, submodule_refs; |
0ae91be0 | 161 | static struct ref_list *current_ref; |
5e290ff7 | 162 | |
e142a3c6 DB |
163 | static struct ref_list *extra_refs; |
164 | ||
5e290ff7 JH |
165 | static void free_ref_list(struct ref_list *list) |
166 | { | |
167 | struct ref_list *next; | |
168 | for ( ; list; list = next) { | |
169 | next = list->next; | |
170 | free(list); | |
171 | } | |
172 | } | |
173 | ||
174 | static void invalidate_cached_refs(void) | |
e1e22e37 | 175 | { |
5e290ff7 JH |
176 | struct cached_refs *ca = &cached_refs; |
177 | ||
178 | if (ca->did_loose && ca->loose) | |
179 | free_ref_list(ca->loose); | |
180 | if (ca->did_packed && ca->packed) | |
181 | free_ref_list(ca->packed); | |
182 | ca->loose = ca->packed = NULL; | |
183 | ca->did_loose = ca->did_packed = 0; | |
184 | } | |
e1e22e37 | 185 | |
f4204ab9 JH |
186 | static void read_packed_refs(FILE *f, struct cached_refs *cached_refs) |
187 | { | |
188 | struct ref_list *list = NULL; | |
189 | struct ref_list *last = NULL; | |
190 | char refline[PATH_MAX]; | |
191 | int flag = REF_ISPACKED; | |
192 | ||
193 | while (fgets(refline, sizeof(refline), f)) { | |
194 | unsigned char sha1[20]; | |
195 | const char *name; | |
196 | static const char header[] = "# pack-refs with:"; | |
197 | ||
198 | if (!strncmp(refline, header, sizeof(header)-1)) { | |
199 | const char *traits = refline + sizeof(header) - 1; | |
200 | if (strstr(traits, " peeled ")) | |
201 | flag |= REF_KNOWS_PEELED; | |
202 | /* perhaps other traits later as well */ | |
203 | continue; | |
204 | } | |
205 | ||
206 | name = parse_ref_line(refline, sha1); | |
207 | if (name) { | |
208 | list = add_ref(name, sha1, flag, list, &last); | |
209 | continue; | |
210 | } | |
211 | if (last && | |
212 | refline[0] == '^' && | |
213 | strlen(refline) == 42 && | |
214 | refline[41] == '\n' && | |
215 | !get_sha1_hex(refline + 1, sha1)) | |
216 | hashcpy(last->peeled, sha1); | |
217 | } | |
c774aab9 | 218 | cached_refs->packed = sort_ref_list(list); |
f4204ab9 JH |
219 | } |
220 | ||
e142a3c6 DB |
221 | void add_extra_ref(const char *name, const unsigned char *sha1, int flag) |
222 | { | |
223 | extra_refs = add_ref(name, sha1, flag, extra_refs, NULL); | |
224 | } | |
225 | ||
226 | void clear_extra_refs(void) | |
227 | { | |
228 | free_ref_list(extra_refs); | |
229 | extra_refs = NULL; | |
230 | } | |
231 | ||
0bad611b | 232 | static struct ref_list *get_packed_refs(const char *submodule) |
5e290ff7 | 233 | { |
0bad611b HV |
234 | const char *packed_refs_file; |
235 | struct cached_refs *refs; | |
236 | ||
237 | if (submodule) { | |
238 | packed_refs_file = git_path_submodule(submodule, "packed-refs"); | |
239 | refs = &submodule_refs; | |
240 | free_ref_list(refs->packed); | |
241 | } else { | |
242 | packed_refs_file = git_path("packed-refs"); | |
243 | refs = &cached_refs; | |
244 | } | |
245 | ||
246 | if (!refs->did_packed || submodule) { | |
247 | FILE *f = fopen(packed_refs_file, "r"); | |
248 | refs->packed = NULL; | |
e1e22e37 | 249 | if (f) { |
0bad611b | 250 | read_packed_refs(f, refs); |
e1e22e37 | 251 | fclose(f); |
e1e22e37 | 252 | } |
0bad611b | 253 | refs->did_packed = 1; |
e1e22e37 | 254 | } |
0bad611b | 255 | return refs->packed; |
e1e22e37 LT |
256 | } |
257 | ||
0bad611b HV |
258 | static struct ref_list *get_ref_dir(const char *submodule, const char *base, |
259 | struct ref_list *list) | |
e1e22e37 | 260 | { |
0bad611b HV |
261 | DIR *dir; |
262 | const char *path; | |
263 | ||
264 | if (submodule) | |
265 | path = git_path_submodule(submodule, "%s", base); | |
266 | else | |
267 | path = git_path("%s", base); | |
268 | ||
269 | ||
270 | dir = opendir(path); | |
e1e22e37 LT |
271 | |
272 | if (dir) { | |
273 | struct dirent *de; | |
274 | int baselen = strlen(base); | |
ed378ec7 | 275 | char *ref = xmalloc(baselen + 257); |
e1e22e37 | 276 | |
ed378ec7 | 277 | memcpy(ref, base, baselen); |
e1e22e37 | 278 | if (baselen && base[baselen-1] != '/') |
ed378ec7 | 279 | ref[baselen++] = '/'; |
e1e22e37 LT |
280 | |
281 | while ((de = readdir(dir)) != NULL) { | |
282 | unsigned char sha1[20]; | |
283 | struct stat st; | |
8da19775 | 284 | int flag; |
e1e22e37 | 285 | int namelen; |
0bad611b | 286 | const char *refdir; |
e1e22e37 LT |
287 | |
288 | if (de->d_name[0] == '.') | |
289 | continue; | |
290 | namelen = strlen(de->d_name); | |
291 | if (namelen > 255) | |
292 | continue; | |
293 | if (has_extension(de->d_name, ".lock")) | |
294 | continue; | |
ed378ec7 | 295 | memcpy(ref + baselen, de->d_name, namelen+1); |
0bad611b HV |
296 | refdir = submodule |
297 | ? git_path_submodule(submodule, "%s", ref) | |
298 | : git_path("%s", ref); | |
299 | if (stat(refdir, &st) < 0) | |
e1e22e37 LT |
300 | continue; |
301 | if (S_ISDIR(st.st_mode)) { | |
0bad611b | 302 | list = get_ref_dir(submodule, ref, list); |
e1e22e37 LT |
303 | continue; |
304 | } | |
0bad611b | 305 | if (submodule) { |
f8948e2f | 306 | hashclr(sha1); |
0bad611b HV |
307 | flag = 0; |
308 | if (resolve_gitlink_ref(submodule, ref, sha1) < 0) { | |
309 | hashclr(sha1); | |
310 | flag |= REF_BROKEN; | |
311 | } | |
312 | } else | |
313 | if (!resolve_ref(ref, sha1, 1, &flag)) { | |
314 | hashclr(sha1); | |
315 | flag |= REF_BROKEN; | |
316 | } | |
f4204ab9 | 317 | list = add_ref(ref, sha1, flag, list, NULL); |
e1e22e37 | 318 | } |
ed378ec7 | 319 | free(ref); |
e1e22e37 LT |
320 | closedir(dir); |
321 | } | |
c774aab9 | 322 | return sort_ref_list(list); |
e1e22e37 LT |
323 | } |
324 | ||
f8948e2f | 325 | struct warn_if_dangling_data { |
3cf6134a | 326 | FILE *fp; |
f8948e2f JH |
327 | const char *refname; |
328 | const char *msg_fmt; | |
329 | }; | |
330 | ||
331 | static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1, | |
332 | int flags, void *cb_data) | |
333 | { | |
334 | struct warn_if_dangling_data *d = cb_data; | |
335 | const char *resolves_to; | |
336 | unsigned char junk[20]; | |
337 | ||
338 | if (!(flags & REF_ISSYMREF)) | |
339 | return 0; | |
340 | ||
341 | resolves_to = resolve_ref(refname, junk, 0, NULL); | |
342 | if (!resolves_to || strcmp(resolves_to, d->refname)) | |
343 | return 0; | |
344 | ||
3cf6134a | 345 | fprintf(d->fp, d->msg_fmt, refname); |
f8948e2f JH |
346 | return 0; |
347 | } | |
348 | ||
3cf6134a | 349 | void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname) |
f8948e2f | 350 | { |
66dbfd55 GV |
351 | struct warn_if_dangling_data data; |
352 | ||
353 | data.fp = fp; | |
354 | data.refname = refname; | |
355 | data.msg_fmt = msg_fmt; | |
f8948e2f JH |
356 | for_each_rawref(warn_if_dangling_symref, &data); |
357 | } | |
358 | ||
0bad611b | 359 | static struct ref_list *get_loose_refs(const char *submodule) |
e1e22e37 | 360 | { |
0bad611b HV |
361 | if (submodule) { |
362 | free_ref_list(submodule_refs.loose); | |
363 | submodule_refs.loose = get_ref_dir(submodule, "refs", NULL); | |
364 | return submodule_refs.loose; | |
365 | } | |
366 | ||
5e290ff7 | 367 | if (!cached_refs.did_loose) { |
0bad611b | 368 | cached_refs.loose = get_ref_dir(NULL, "refs", NULL); |
5e290ff7 | 369 | cached_refs.did_loose = 1; |
e1e22e37 | 370 | } |
5e290ff7 | 371 | return cached_refs.loose; |
e1e22e37 LT |
372 | } |
373 | ||
ca8db142 LT |
374 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
375 | #define MAXDEPTH 5 | |
0ebde32c LT |
376 | #define MAXREFLEN (1024) |
377 | ||
378 | static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result) | |
379 | { | |
380 | FILE *f; | |
381 | struct cached_refs refs; | |
382 | struct ref_list *ref; | |
383 | int retval; | |
384 | ||
385 | strcpy(name + pathlen, "packed-refs"); | |
386 | f = fopen(name, "r"); | |
387 | if (!f) | |
388 | return -1; | |
389 | read_packed_refs(f, &refs); | |
390 | fclose(f); | |
391 | ref = refs.packed; | |
392 | retval = -1; | |
393 | while (ref) { | |
394 | if (!strcmp(ref->name, refname)) { | |
395 | retval = 0; | |
396 | memcpy(result, ref->sha1, 20); | |
397 | break; | |
398 | } | |
399 | ref = ref->next; | |
400 | } | |
401 | free_ref_list(refs.packed); | |
402 | return retval; | |
403 | } | |
404 | ||
405 | static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion) | |
406 | { | |
407 | int fd, len = strlen(refname); | |
408 | char buffer[128], *p; | |
409 | ||
410 | if (recursion > MAXDEPTH || len > MAXREFLEN) | |
411 | return -1; | |
412 | memcpy(name + pathlen, refname, len+1); | |
413 | fd = open(name, O_RDONLY); | |
414 | if (fd < 0) | |
415 | return resolve_gitlink_packed_ref(name, pathlen, refname, result); | |
416 | ||
417 | len = read(fd, buffer, sizeof(buffer)-1); | |
418 | close(fd); | |
419 | if (len < 0) | |
420 | return -1; | |
421 | while (len && isspace(buffer[len-1])) | |
422 | len--; | |
423 | buffer[len] = 0; | |
424 | ||
425 | /* Was it a detached head or an old-fashioned symlink? */ | |
426 | if (!get_sha1_hex(buffer, result)) | |
427 | return 0; | |
428 | ||
429 | /* Symref? */ | |
430 | if (strncmp(buffer, "ref:", 4)) | |
431 | return -1; | |
432 | p = buffer + 4; | |
433 | while (isspace(*p)) | |
434 | p++; | |
435 | ||
436 | return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1); | |
437 | } | |
438 | ||
439 | int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result) | |
440 | { | |
441 | int len = strlen(path), retval; | |
442 | char *gitdir; | |
842abf06 | 443 | const char *tmp; |
0ebde32c LT |
444 | |
445 | while (len && path[len-1] == '/') | |
446 | len--; | |
447 | if (!len) | |
448 | return -1; | |
449 | gitdir = xmalloc(len + MAXREFLEN + 8); | |
450 | memcpy(gitdir, path, len); | |
842abf06 LH |
451 | memcpy(gitdir + len, "/.git", 6); |
452 | len += 5; | |
453 | ||
13d6ec91 | 454 | tmp = read_gitfile(gitdir); |
842abf06 LH |
455 | if (tmp) { |
456 | free(gitdir); | |
457 | len = strlen(tmp); | |
458 | gitdir = xmalloc(len + MAXREFLEN + 3); | |
459 | memcpy(gitdir, tmp, len); | |
460 | } | |
461 | gitdir[len] = '/'; | |
462 | gitdir[++len] = '\0'; | |
463 | retval = resolve_gitlink_ref_recursive(gitdir, len, refname, result, 0); | |
0ebde32c LT |
464 | free(gitdir); |
465 | return retval; | |
466 | } | |
ca8db142 | 467 | |
c224ca7f MH |
468 | /* |
469 | * Try to read ref from the packed references. On success, set sha1 | |
470 | * and return 0; otherwise, return -1. | |
471 | */ | |
472 | static int get_packed_ref(const char *ref, unsigned char *sha1) | |
473 | { | |
474 | struct ref_list *list = get_packed_refs(NULL); | |
475 | while (list) { | |
476 | if (!strcmp(ref, list->name)) { | |
477 | hashcpy(sha1, list->sha1); | |
478 | return 0; | |
479 | } | |
480 | list = list->next; | |
481 | } | |
482 | return -1; | |
483 | } | |
484 | ||
4886b89f CC |
485 | /* |
486 | * If the "reading" argument is set, this function finds out what _object_ | |
487 | * the ref points at by "reading" the ref. The ref, if it is not symbolic, | |
488 | * has to exist, and if it is symbolic, it has to point at an existing ref, | |
489 | * because the "read" goes through the symref to the ref it points at. | |
490 | * | |
491 | * The access that is not "reading" may often be "writing", but does not | |
492 | * have to; it can be merely checking _where it leads to_. If it is a | |
493 | * prelude to "writing" to the ref, a write to a symref that points at | |
494 | * yet-to-be-born ref will create the real ref pointed by the symref. | |
495 | * reading=0 allows the caller to check where such a symref leads to. | |
496 | */ | |
8da19775 | 497 | const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 498 | { |
0104ca09 HO |
499 | int depth = MAXDEPTH; |
500 | ssize_t len; | |
a876ed83 | 501 | char buffer[256]; |
ed378ec7 | 502 | static char ref_buffer[256]; |
ca8db142 | 503 | |
8da19775 JH |
504 | if (flag) |
505 | *flag = 0; | |
506 | ||
8384d788 MH |
507 | if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL)) |
508 | return NULL; | |
509 | ||
a876ed83 | 510 | for (;;) { |
958a4789 | 511 | char path[PATH_MAX]; |
a876ed83 JH |
512 | struct stat st; |
513 | char *buf; | |
514 | int fd; | |
8a65ff76 | 515 | |
a876ed83 JH |
516 | if (--depth < 0) |
517 | return NULL; | |
ca8db142 | 518 | |
958a4789 | 519 | git_snpath(path, sizeof(path), "%s", ref); |
c224ca7f | 520 | |
a876ed83 | 521 | if (lstat(path, &st) < 0) { |
c224ca7f MH |
522 | if (errno != ENOENT) |
523 | return NULL; | |
524 | /* | |
525 | * The loose reference file does not exist; | |
526 | * check for a packed reference. | |
527 | */ | |
528 | if (!get_packed_ref(ref, sha1)) { | |
529 | if (flag) | |
530 | *flag |= REF_ISPACKED; | |
531 | return ref; | |
434cd0cd | 532 | } |
c224ca7f MH |
533 | /* The reference is not a packed reference, either. */ |
534 | if (reading) { | |
a876ed83 | 535 | return NULL; |
c224ca7f MH |
536 | } else { |
537 | hashclr(sha1); | |
538 | return ref; | |
539 | } | |
a876ed83 | 540 | } |
ca8db142 | 541 | |
a876ed83 JH |
542 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
543 | if (S_ISLNK(st.st_mode)) { | |
544 | len = readlink(path, buffer, sizeof(buffer)-1); | |
7bb2bf8e MH |
545 | if (len < 0) |
546 | return NULL; | |
b54cb795 | 547 | buffer[len] = 0; |
1f58a038 MH |
548 | if (!prefixcmp(buffer, "refs/") && |
549 | !check_refname_format(buffer, 0)) { | |
ed378ec7 LT |
550 | strcpy(ref_buffer, buffer); |
551 | ref = ref_buffer; | |
8da19775 JH |
552 | if (flag) |
553 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
554 | continue; |
555 | } | |
ca8db142 | 556 | } |
a876ed83 | 557 | |
7a21632f DS |
558 | /* Is it a directory? */ |
559 | if (S_ISDIR(st.st_mode)) { | |
560 | errno = EISDIR; | |
561 | return NULL; | |
562 | } | |
563 | ||
a876ed83 JH |
564 | /* |
565 | * Anything else, just open it and try to use it as | |
566 | * a ref | |
567 | */ | |
568 | fd = open(path, O_RDONLY); | |
569 | if (fd < 0) | |
570 | return NULL; | |
93d26e4c | 571 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
a876ed83 | 572 | close(fd); |
28775050 MH |
573 | if (len < 0) |
574 | return NULL; | |
575 | while (len && isspace(buffer[len-1])) | |
576 | len--; | |
577 | buffer[len] = '\0'; | |
a876ed83 JH |
578 | |
579 | /* | |
580 | * Is it a symbolic ref? | |
581 | */ | |
28775050 | 582 | if (prefixcmp(buffer, "ref:")) |
a876ed83 JH |
583 | break; |
584 | buf = buffer + 4; | |
28775050 MH |
585 | while (isspace(*buf)) |
586 | buf++; | |
313fb010 MH |
587 | if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) { |
588 | warning("symbolic reference in %s is formatted incorrectly", | |
589 | path); | |
590 | return NULL; | |
591 | } | |
28775050 | 592 | ref = strcpy(ref_buffer, buf); |
8da19775 JH |
593 | if (flag) |
594 | *flag |= REF_ISSYMREF; | |
8a65ff76 | 595 | } |
28775050 | 596 | if (get_sha1_hex(buffer, sha1)) |
a876ed83 | 597 | return NULL; |
ed378ec7 | 598 | return ref; |
a876ed83 JH |
599 | } |
600 | ||
d08bae7e IL |
601 | /* The argument to filter_refs */ |
602 | struct ref_filter { | |
603 | const char *pattern; | |
604 | each_ref_fn *fn; | |
605 | void *cb_data; | |
606 | }; | |
607 | ||
ed378ec7 | 608 | int read_ref(const char *ref, unsigned char *sha1) |
a876ed83 | 609 | { |
8da19775 | 610 | if (resolve_ref(ref, sha1, 1, NULL)) |
a876ed83 JH |
611 | return 0; |
612 | return -1; | |
8a65ff76 LT |
613 | } |
614 | ||
f8948e2f | 615 | #define DO_FOR_EACH_INCLUDE_BROKEN 01 |
ef06b918 | 616 | static int do_one_ref(const char *base, each_ref_fn fn, int trim, |
f8948e2f | 617 | int flags, void *cb_data, struct ref_list *entry) |
ef06b918 | 618 | { |
b3cfc406 | 619 | if (prefixcmp(entry->name, base)) |
ef06b918 | 620 | return 0; |
e01de1c9 | 621 | |
f8948e2f | 622 | if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) { |
e01de1c9 JH |
623 | if (entry->flag & REF_BROKEN) |
624 | return 0; /* ignore dangling symref */ | |
f8948e2f JH |
625 | if (!has_sha1_file(entry->sha1)) { |
626 | error("%s does not point to a valid object!", entry->name); | |
627 | return 0; | |
628 | } | |
ef06b918 | 629 | } |
0ae91be0 | 630 | current_ref = entry; |
ef06b918 JH |
631 | return fn(entry->name + trim, entry->sha1, entry->flag, cb_data); |
632 | } | |
633 | ||
d08bae7e IL |
634 | static int filter_refs(const char *ref, const unsigned char *sha, int flags, |
635 | void *data) | |
636 | { | |
637 | struct ref_filter *filter = (struct ref_filter *)data; | |
638 | if (fnmatch(filter->pattern, ref, 0)) | |
639 | return 0; | |
640 | return filter->fn(ref, sha, flags, filter->cb_data); | |
641 | } | |
642 | ||
cf0adba7 JH |
643 | int peel_ref(const char *ref, unsigned char *sha1) |
644 | { | |
645 | int flag; | |
646 | unsigned char base[20]; | |
647 | struct object *o; | |
648 | ||
0ae91be0 SP |
649 | if (current_ref && (current_ref->name == ref |
650 | || !strcmp(current_ref->name, ref))) { | |
651 | if (current_ref->flag & REF_KNOWS_PEELED) { | |
652 | hashcpy(sha1, current_ref->peeled); | |
653 | return 0; | |
654 | } | |
655 | hashcpy(base, current_ref->sha1); | |
656 | goto fallback; | |
657 | } | |
658 | ||
cf0adba7 JH |
659 | if (!resolve_ref(ref, base, 1, &flag)) |
660 | return -1; | |
661 | ||
662 | if ((flag & REF_ISPACKED)) { | |
0bad611b | 663 | struct ref_list *list = get_packed_refs(NULL); |
cf0adba7 JH |
664 | |
665 | while (list) { | |
f4204ab9 JH |
666 | if (!strcmp(list->name, ref)) { |
667 | if (list->flag & REF_KNOWS_PEELED) { | |
668 | hashcpy(sha1, list->peeled); | |
669 | return 0; | |
670 | } | |
671 | /* older pack-refs did not leave peeled ones */ | |
672 | break; | |
cf0adba7 JH |
673 | } |
674 | list = list->next; | |
675 | } | |
cf0adba7 JH |
676 | } |
677 | ||
0ae91be0 | 678 | fallback: |
cf0adba7 | 679 | o = parse_object(base); |
8c87dc77 | 680 | if (o && o->type == OBJ_TAG) { |
cf0adba7 JH |
681 | o = deref_tag(o, ref, 0); |
682 | if (o) { | |
683 | hashcpy(sha1, o->sha1); | |
684 | return 0; | |
685 | } | |
686 | } | |
687 | return -1; | |
688 | } | |
689 | ||
0bad611b HV |
690 | static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn, |
691 | int trim, int flags, void *cb_data) | |
8a65ff76 | 692 | { |
0ae91be0 | 693 | int retval = 0; |
0bad611b HV |
694 | struct ref_list *packed = get_packed_refs(submodule); |
695 | struct ref_list *loose = get_loose_refs(submodule); | |
8a65ff76 | 696 | |
e142a3c6 DB |
697 | struct ref_list *extra; |
698 | ||
699 | for (extra = extra_refs; extra; extra = extra->next) | |
f8948e2f | 700 | retval = do_one_ref(base, fn, trim, flags, cb_data, extra); |
e142a3c6 | 701 | |
e1e22e37 LT |
702 | while (packed && loose) { |
703 | struct ref_list *entry; | |
704 | int cmp = strcmp(packed->name, loose->name); | |
705 | if (!cmp) { | |
706 | packed = packed->next; | |
707 | continue; | |
6cada6a9 | 708 | } |
e1e22e37 LT |
709 | if (cmp > 0) { |
710 | entry = loose; | |
711 | loose = loose->next; | |
712 | } else { | |
713 | entry = packed; | |
714 | packed = packed->next; | |
715 | } | |
f8948e2f | 716 | retval = do_one_ref(base, fn, trim, flags, cb_data, entry); |
e1e22e37 | 717 | if (retval) |
0ae91be0 | 718 | goto end_each; |
e1e22e37 | 719 | } |
8a65ff76 | 720 | |
ef06b918 | 721 | for (packed = packed ? packed : loose; packed; packed = packed->next) { |
f8948e2f | 722 | retval = do_one_ref(base, fn, trim, flags, cb_data, packed); |
ef06b918 | 723 | if (retval) |
0ae91be0 | 724 | goto end_each; |
8a65ff76 | 725 | } |
0ae91be0 SP |
726 | |
727 | end_each: | |
728 | current_ref = NULL; | |
729 | return retval; | |
8a65ff76 LT |
730 | } |
731 | ||
0bad611b HV |
732 | |
733 | static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data) | |
723c31fe LT |
734 | { |
735 | unsigned char sha1[20]; | |
8da19775 JH |
736 | int flag; |
737 | ||
0bad611b HV |
738 | if (submodule) { |
739 | if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0) | |
740 | return fn("HEAD", sha1, 0, cb_data); | |
741 | ||
742 | return 0; | |
743 | } | |
744 | ||
8da19775 JH |
745 | if (resolve_ref("HEAD", sha1, 1, &flag)) |
746 | return fn("HEAD", sha1, flag, cb_data); | |
0bad611b | 747 | |
2f34ba32 | 748 | return 0; |
723c31fe LT |
749 | } |
750 | ||
0bad611b HV |
751 | int head_ref(each_ref_fn fn, void *cb_data) |
752 | { | |
753 | return do_head_ref(NULL, fn, cb_data); | |
754 | } | |
755 | ||
9ef6aeb0 HV |
756 | int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
757 | { | |
758 | return do_head_ref(submodule, fn, cb_data); | |
759 | } | |
760 | ||
cb5d709f | 761 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 762 | { |
b3cfc406 | 763 | return do_for_each_ref(NULL, "", fn, 0, 0, cb_data); |
a62be77f SE |
764 | } |
765 | ||
9ef6aeb0 HV |
766 | int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
767 | { | |
b3cfc406 | 768 | return do_for_each_ref(submodule, "", fn, 0, 0, cb_data); |
a62be77f SE |
769 | } |
770 | ||
2a8177b6 CC |
771 | int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data) |
772 | { | |
0bad611b | 773 | return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data); |
2a8177b6 CC |
774 | } |
775 | ||
9ef6aeb0 HV |
776 | int for_each_ref_in_submodule(const char *submodule, const char *prefix, |
777 | each_ref_fn fn, void *cb_data) | |
778 | { | |
779 | return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data); | |
2a8177b6 CC |
780 | } |
781 | ||
cb5d709f | 782 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 783 | { |
2a8177b6 | 784 | return for_each_ref_in("refs/tags/", fn, cb_data); |
a62be77f SE |
785 | } |
786 | ||
9ef6aeb0 HV |
787 | int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
788 | { | |
789 | return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data); | |
790 | } | |
791 | ||
cb5d709f | 792 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 793 | { |
2a8177b6 | 794 | return for_each_ref_in("refs/heads/", fn, cb_data); |
a62be77f SE |
795 | } |
796 | ||
9ef6aeb0 HV |
797 | int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
798 | { | |
799 | return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data); | |
800 | } | |
801 | ||
cb5d709f | 802 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 803 | { |
2a8177b6 | 804 | return for_each_ref_in("refs/remotes/", fn, cb_data); |
f8948e2f JH |
805 | } |
806 | ||
9ef6aeb0 HV |
807 | int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
808 | { | |
809 | return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data); | |
810 | } | |
811 | ||
29268700 CC |
812 | int for_each_replace_ref(each_ref_fn fn, void *cb_data) |
813 | { | |
0bad611b | 814 | return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data); |
29268700 CC |
815 | } |
816 | ||
a1bea2c1 JT |
817 | int head_ref_namespaced(each_ref_fn fn, void *cb_data) |
818 | { | |
819 | struct strbuf buf = STRBUF_INIT; | |
820 | int ret = 0; | |
821 | unsigned char sha1[20]; | |
822 | int flag; | |
823 | ||
824 | strbuf_addf(&buf, "%sHEAD", get_git_namespace()); | |
825 | if (resolve_ref(buf.buf, sha1, 1, &flag)) | |
826 | ret = fn(buf.buf, sha1, flag, cb_data); | |
827 | strbuf_release(&buf); | |
828 | ||
829 | return ret; | |
830 | } | |
831 | ||
832 | int for_each_namespaced_ref(each_ref_fn fn, void *cb_data) | |
833 | { | |
834 | struct strbuf buf = STRBUF_INIT; | |
835 | int ret; | |
836 | strbuf_addf(&buf, "%srefs/", get_git_namespace()); | |
837 | ret = do_for_each_ref(NULL, buf.buf, fn, 0, 0, cb_data); | |
838 | strbuf_release(&buf); | |
839 | return ret; | |
840 | } | |
841 | ||
b09fe971 IL |
842 | int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, |
843 | const char *prefix, void *cb_data) | |
d08bae7e IL |
844 | { |
845 | struct strbuf real_pattern = STRBUF_INIT; | |
846 | struct ref_filter filter; | |
d08bae7e IL |
847 | int ret; |
848 | ||
b09fe971 | 849 | if (!prefix && prefixcmp(pattern, "refs/")) |
d08bae7e | 850 | strbuf_addstr(&real_pattern, "refs/"); |
b09fe971 IL |
851 | else if (prefix) |
852 | strbuf_addstr(&real_pattern, prefix); | |
d08bae7e IL |
853 | strbuf_addstr(&real_pattern, pattern); |
854 | ||
894a9d33 | 855 | if (!has_glob_specials(pattern)) { |
9517e6b8 | 856 | /* Append implied '/' '*' if not present. */ |
d08bae7e IL |
857 | if (real_pattern.buf[real_pattern.len - 1] != '/') |
858 | strbuf_addch(&real_pattern, '/'); | |
859 | /* No need to check for '*', there is none. */ | |
860 | strbuf_addch(&real_pattern, '*'); | |
861 | } | |
862 | ||
863 | filter.pattern = real_pattern.buf; | |
864 | filter.fn = fn; | |
865 | filter.cb_data = cb_data; | |
866 | ret = for_each_ref(filter_refs, &filter); | |
867 | ||
868 | strbuf_release(&real_pattern); | |
869 | return ret; | |
870 | } | |
871 | ||
b09fe971 IL |
872 | int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data) |
873 | { | |
874 | return for_each_glob_ref_in(fn, pattern, NULL, cb_data); | |
875 | } | |
876 | ||
f8948e2f JH |
877 | int for_each_rawref(each_ref_fn fn, void *cb_data) |
878 | { | |
b3cfc406 | 879 | return do_for_each_ref(NULL, "", fn, 0, |
f8948e2f | 880 | DO_FOR_EACH_INCLUDE_BROKEN, cb_data); |
8a65ff76 LT |
881 | } |
882 | ||
03feddd6 JH |
883 | /* |
884 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
885 | * We do not like it if: | |
886 | * | |
887 | * - any path component of it begins with ".", or | |
888 | * - it has double dots "..", or | |
889 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
890 | * - it ends with a "/". | |
3e262b95 | 891 | * - it ends with ".lock" |
a4c2e699 | 892 | * - it contains a "\" (backslash) |
03feddd6 JH |
893 | */ |
894 | ||
9224b73b | 895 | /* Return true iff ch is not allowed in reference names. */ |
03feddd6 JH |
896 | static inline int bad_ref_char(int ch) |
897 | { | |
f3738c1c | 898 | if (((unsigned) ch) <= ' ' || ch == 0x7f || |
a4c2e699 | 899 | ch == '~' || ch == '^' || ch == ':' || ch == '\\') |
8558fd9e DB |
900 | return 1; |
901 | /* 2.13 Pattern Matching Notation */ | |
9224b73b | 902 | if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */ |
8558fd9e | 903 | return 1; |
8558fd9e | 904 | return 0; |
03feddd6 JH |
905 | } |
906 | ||
49295d4e MH |
907 | /* |
908 | * Try to read one refname component from the front of ref. Return | |
909 | * the length of the component found, or -1 if the component is not | |
910 | * legal. | |
911 | */ | |
912 | static int check_refname_component(const char *ref) | |
913 | { | |
914 | const char *cp; | |
915 | char last = '\0'; | |
916 | ||
917 | for (cp = ref; ; cp++) { | |
918 | char ch = *cp; | |
919 | if (ch == '\0' || ch == '/') | |
920 | break; | |
921 | if (bad_ref_char(ch)) | |
922 | return -1; /* Illegal character in refname. */ | |
923 | if (last == '.' && ch == '.') | |
924 | return -1; /* Refname contains "..". */ | |
925 | if (last == '@' && ch == '{') | |
926 | return -1; /* Refname contains "@{". */ | |
927 | last = ch; | |
928 | } | |
929 | if (cp == ref) | |
930 | return -1; /* Component has zero length. */ | |
931 | if (ref[0] == '.') | |
932 | return -1; /* Component starts with '.'. */ | |
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 MH |
943 | /* We are at the start of a path component. */ |
944 | component_len = check_refname_component(ref); | |
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 | ||
68db31cc | 1069 | static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p) |
4bd18c43 | 1070 | { |
434cd0cd | 1071 | char *ref_file; |
ed378ec7 | 1072 | const char *orig_ref = ref; |
4bd18c43 | 1073 | struct ref_lock *lock; |
5cc3cef9 | 1074 | int last_errno = 0; |
acd3b9ec | 1075 | int type, lflags; |
4431fcc4 | 1076 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
5bdd8d4a | 1077 | int missing = 0; |
4bd18c43 SP |
1078 | |
1079 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
1080 | lock->lock_fd = -1; | |
1081 | ||
68db31cc | 1082 | ref = resolve_ref(ref, lock->old_sha1, mustexist, &type); |
bc7127ef JH |
1083 | if (!ref && errno == EISDIR) { |
1084 | /* we are trying to lock foo but we used to | |
1085 | * have foo/bar which now does not exist; | |
1086 | * it is normal for the empty directory 'foo' | |
1087 | * to remain. | |
1088 | */ | |
1089 | ref_file = git_path("%s", orig_ref); | |
5cc3cef9 JH |
1090 | if (remove_empty_directories(ref_file)) { |
1091 | last_errno = errno; | |
1092 | error("there are still refs under '%s'", orig_ref); | |
1093 | goto error_return; | |
1094 | } | |
68db31cc | 1095 | ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type); |
bc7127ef | 1096 | } |
68db31cc SV |
1097 | if (type_p) |
1098 | *type_p = type; | |
ed378ec7 | 1099 | if (!ref) { |
5cc3cef9 | 1100 | last_errno = errno; |
818f477c | 1101 | error("unable to resolve reference %s: %s", |
ed378ec7 | 1102 | orig_ref, strerror(errno)); |
5cc3cef9 | 1103 | goto error_return; |
4bd18c43 | 1104 | } |
5bdd8d4a | 1105 | missing = is_null_sha1(lock->old_sha1); |
c976d415 LH |
1106 | /* When the ref did not exist and we are creating it, |
1107 | * make sure there is no existing ref that is packed | |
1108 | * whose name begins with our refname, nor a ref whose | |
1109 | * name is a proper prefix of our refname. | |
1110 | */ | |
5bdd8d4a | 1111 | if (missing && |
0bad611b | 1112 | !is_refname_available(ref, NULL, get_packed_refs(NULL), 0)) { |
f475e08e | 1113 | last_errno = ENOTDIR; |
c976d415 | 1114 | goto error_return; |
f475e08e | 1115 | } |
22a3844e | 1116 | |
c33d5174 | 1117 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 1118 | |
acd3b9ec JH |
1119 | lflags = LOCK_DIE_ON_ERROR; |
1120 | if (flags & REF_NODEREF) { | |
68db31cc | 1121 | ref = orig_ref; |
acd3b9ec JH |
1122 | lflags |= LOCK_NODEREF; |
1123 | } | |
434cd0cd | 1124 | lock->ref_name = xstrdup(ref); |
1655707c | 1125 | lock->orig_ref_name = xstrdup(orig_ref); |
7c1a278d | 1126 | ref_file = git_path("%s", ref); |
5bdd8d4a | 1127 | if (missing) |
68db31cc SV |
1128 | lock->force_write = 1; |
1129 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
1130 | lock->force_write = 1; | |
4bd18c43 | 1131 | |
5cc3cef9 JH |
1132 | if (safe_create_leading_directories(ref_file)) { |
1133 | last_errno = errno; | |
1134 | error("unable to create directory for %s", ref_file); | |
1135 | goto error_return; | |
1136 | } | |
4bd18c43 | 1137 | |
acd3b9ec | 1138 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags); |
4bd18c43 | 1139 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; |
5cc3cef9 JH |
1140 | |
1141 | error_return: | |
1142 | unlock_ref(lock); | |
1143 | errno = last_errno; | |
1144 | return NULL; | |
4bd18c43 SP |
1145 | } |
1146 | ||
4431fcc4 | 1147 | struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1) |
95fc7512 | 1148 | { |
53cce84c | 1149 | char refpath[PATH_MAX]; |
8d9c5010 | 1150 | if (check_refname_format(ref, 0)) |
4bd18c43 | 1151 | return NULL; |
53cce84c | 1152 | strcpy(refpath, mkpath("refs/%s", ref)); |
68db31cc | 1153 | return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL); |
4bd18c43 SP |
1154 | } |
1155 | ||
68db31cc | 1156 | struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags) |
4bd18c43 | 1157 | { |
8d9c5010 | 1158 | if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL)) |
257f3020 | 1159 | return NULL; |
8d9c5010 | 1160 | return lock_ref_sha1_basic(ref, old_sha1, flags, NULL); |
c0277d15 JH |
1161 | } |
1162 | ||
26a063a1 JH |
1163 | static struct lock_file packlock; |
1164 | ||
c0277d15 JH |
1165 | static int repack_without_ref(const char *refname) |
1166 | { | |
1167 | struct ref_list *list, *packed_ref_list; | |
1168 | int fd; | |
1169 | int found = 0; | |
c0277d15 | 1170 | |
0bad611b | 1171 | packed_ref_list = get_packed_refs(NULL); |
c0277d15 JH |
1172 | for (list = packed_ref_list; list; list = list->next) { |
1173 | if (!strcmp(refname, list->name)) { | |
1174 | found = 1; | |
1175 | break; | |
1176 | } | |
1177 | } | |
1178 | if (!found) | |
1179 | return 0; | |
c0277d15 | 1180 | fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0); |
1b018fd9 MV |
1181 | if (fd < 0) { |
1182 | unable_to_lock_error(git_path("packed-refs"), errno); | |
c0277d15 | 1183 | return error("cannot delete '%s' from packed refs", refname); |
1b018fd9 | 1184 | } |
c0277d15 JH |
1185 | |
1186 | for (list = packed_ref_list; list; list = list->next) { | |
1187 | char line[PATH_MAX + 100]; | |
1188 | int len; | |
1189 | ||
1190 | if (!strcmp(refname, list->name)) | |
1191 | continue; | |
1192 | len = snprintf(line, sizeof(line), "%s %s\n", | |
1193 | sha1_to_hex(list->sha1), list->name); | |
1194 | /* this should not happen but just being defensive */ | |
1195 | if (len > sizeof(line)) | |
1196 | die("too long a refname '%s'", list->name); | |
1197 | write_or_die(fd, line, len); | |
1198 | } | |
1199 | return commit_lock_file(&packlock); | |
1200 | } | |
1201 | ||
eca35a25 | 1202 | int delete_ref(const char *refname, const unsigned char *sha1, int delopt) |
c0277d15 JH |
1203 | { |
1204 | struct ref_lock *lock; | |
eca35a25 | 1205 | int err, i = 0, ret = 0, flag = 0; |
c0277d15 | 1206 | |
68db31cc | 1207 | lock = lock_ref_sha1_basic(refname, sha1, 0, &flag); |
c0277d15 JH |
1208 | if (!lock) |
1209 | return 1; | |
045a476f | 1210 | if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) { |
c0277d15 | 1211 | /* loose */ |
eca35a25 MV |
1212 | const char *path; |
1213 | ||
1214 | if (!(delopt & REF_NODEREF)) { | |
1215 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
1216 | lock->lk->filename[i] = 0; | |
1217 | path = lock->lk->filename; | |
1218 | } else { | |
9db56f71 | 1219 | path = git_path("%s", refname); |
eca35a25 | 1220 | } |
691f1a28 AR |
1221 | err = unlink_or_warn(path); |
1222 | if (err && errno != ENOENT) | |
c0277d15 | 1223 | ret = 1; |
691f1a28 | 1224 | |
eca35a25 MV |
1225 | if (!(delopt & REF_NODEREF)) |
1226 | lock->lk->filename[i] = '.'; | |
c0277d15 JH |
1227 | } |
1228 | /* removing the loose one could have resurrected an earlier | |
1229 | * packed one. Also, if it was not loose we need to repack | |
1230 | * without it. | |
1231 | */ | |
1232 | ret |= repack_without_ref(refname); | |
1233 | ||
691f1a28 | 1234 | unlink_or_warn(git_path("logs/%s", lock->ref_name)); |
c0277d15 JH |
1235 | invalidate_cached_refs(); |
1236 | unlock_ref(lock); | |
1237 | return ret; | |
4bd18c43 SP |
1238 | } |
1239 | ||
765c2258 PH |
1240 | /* |
1241 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
1242 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
1243 | * | |
1244 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
1245 | * live into logs/refs. | |
1246 | */ | |
1247 | #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log" | |
1248 | ||
678d0f4c | 1249 | int rename_ref(const char *oldref, const char *newref, const char *logmsg) |
c976d415 LH |
1250 | { |
1251 | static const char renamed_ref[] = "RENAMED-REF"; | |
1252 | unsigned char sha1[20], orig_sha1[20]; | |
1253 | int flag = 0, logmoved = 0; | |
1254 | struct ref_lock *lock; | |
c976d415 | 1255 | struct stat loginfo; |
16c2bfbb | 1256 | int log = !lstat(git_path("logs/%s", oldref), &loginfo); |
eca35a25 | 1257 | const char *symref = NULL; |
c976d415 | 1258 | |
450d4c0f | 1259 | if (log && S_ISLNK(loginfo.st_mode)) |
c976d415 LH |
1260 | return error("reflog for %s is a symlink", oldref); |
1261 | ||
eca35a25 MV |
1262 | symref = resolve_ref(oldref, orig_sha1, 1, &flag); |
1263 | if (flag & REF_ISSYMREF) | |
fa58186c MV |
1264 | return error("refname %s is a symbolic ref, renaming it is not supported", |
1265 | oldref); | |
eca35a25 | 1266 | if (!symref) |
c976d415 LH |
1267 | return error("refname %s not found", oldref); |
1268 | ||
0bad611b | 1269 | if (!is_refname_available(newref, oldref, get_packed_refs(NULL), 0)) |
c976d415 LH |
1270 | return 1; |
1271 | ||
0bad611b | 1272 | if (!is_refname_available(newref, oldref, get_loose_refs(NULL), 0)) |
c976d415 LH |
1273 | return 1; |
1274 | ||
68db31cc | 1275 | lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL); |
c976d415 LH |
1276 | if (!lock) |
1277 | return error("unable to lock %s", renamed_ref); | |
1278 | lock->force_write = 1; | |
678d0f4c | 1279 | if (write_ref_sha1(lock, orig_sha1, logmsg)) |
c976d415 LH |
1280 | return error("unable to save current sha1 in %s", renamed_ref); |
1281 | ||
765c2258 PH |
1282 | if (log && rename(git_path("logs/%s", oldref), git_path(TMP_RENAMED_LOG))) |
1283 | return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s", | |
c976d415 LH |
1284 | oldref, strerror(errno)); |
1285 | ||
eca35a25 | 1286 | if (delete_ref(oldref, orig_sha1, REF_NODEREF)) { |
c976d415 LH |
1287 | error("unable to delete old %s", oldref); |
1288 | goto rollback; | |
1289 | } | |
1290 | ||
eca35a25 | 1291 | if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1, REF_NODEREF)) { |
c976d415 LH |
1292 | if (errno==EISDIR) { |
1293 | if (remove_empty_directories(git_path("%s", newref))) { | |
1294 | error("Directory not empty: %s", newref); | |
1295 | goto rollback; | |
1296 | } | |
1297 | } else { | |
1298 | error("unable to delete existing %s", newref); | |
1299 | goto rollback; | |
1300 | } | |
1301 | } | |
1302 | ||
1303 | if (log && safe_create_leading_directories(git_path("logs/%s", newref))) { | |
1304 | error("unable to create directory for %s", newref); | |
1305 | goto rollback; | |
1306 | } | |
1307 | ||
1308 | retry: | |
765c2258 | 1309 | if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newref))) { |
d9e74d57 JR |
1310 | if (errno==EISDIR || errno==ENOTDIR) { |
1311 | /* | |
1312 | * rename(a, b) when b is an existing | |
1313 | * directory ought to result in ISDIR, but | |
1314 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
1315 | */ | |
c976d415 LH |
1316 | if (remove_empty_directories(git_path("logs/%s", newref))) { |
1317 | error("Directory not empty: logs/%s", newref); | |
1318 | goto rollback; | |
1319 | } | |
1320 | goto retry; | |
1321 | } else { | |
765c2258 | 1322 | error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s", |
c976d415 LH |
1323 | newref, strerror(errno)); |
1324 | goto rollback; | |
1325 | } | |
1326 | } | |
1327 | logmoved = log; | |
1328 | ||
68db31cc | 1329 | lock = lock_ref_sha1_basic(newref, NULL, 0, NULL); |
c976d415 LH |
1330 | if (!lock) { |
1331 | error("unable to lock %s for update", newref); | |
1332 | goto rollback; | |
1333 | } | |
c976d415 LH |
1334 | lock->force_write = 1; |
1335 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 1336 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
c976d415 LH |
1337 | error("unable to write current sha1 into %s", newref); |
1338 | goto rollback; | |
1339 | } | |
1340 | ||
1341 | return 0; | |
1342 | ||
1343 | rollback: | |
68db31cc | 1344 | lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL); |
c976d415 LH |
1345 | if (!lock) { |
1346 | error("unable to lock %s for rollback", oldref); | |
1347 | goto rollbacklog; | |
1348 | } | |
1349 | ||
1350 | lock->force_write = 1; | |
1351 | flag = log_all_ref_updates; | |
1352 | log_all_ref_updates = 0; | |
1353 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
1354 | error("unable to write current sha1 into %s", oldref); | |
1355 | log_all_ref_updates = flag; | |
1356 | ||
1357 | rollbacklog: | |
1358 | if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref))) | |
1359 | error("unable to restore logfile %s from %s: %s", | |
1360 | oldref, newref, strerror(errno)); | |
1361 | if (!logmoved && log && | |
765c2258 PH |
1362 | rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldref))) |
1363 | error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s", | |
c976d415 LH |
1364 | oldref, strerror(errno)); |
1365 | ||
1366 | return 1; | |
1367 | } | |
1368 | ||
435fc852 | 1369 | int close_ref(struct ref_lock *lock) |
b531394d BC |
1370 | { |
1371 | if (close_lock_file(lock->lk)) | |
1372 | return -1; | |
1373 | lock->lock_fd = -1; | |
1374 | return 0; | |
1375 | } | |
1376 | ||
435fc852 | 1377 | int commit_ref(struct ref_lock *lock) |
b531394d BC |
1378 | { |
1379 | if (commit_lock_file(lock->lk)) | |
1380 | return -1; | |
1381 | lock->lock_fd = -1; | |
1382 | return 0; | |
1383 | } | |
1384 | ||
e5f38ec3 | 1385 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 | 1386 | { |
4ed7cd3a BC |
1387 | /* Do not free lock->lk -- atexit() still looks at them */ |
1388 | if (lock->lk) | |
1389 | rollback_lock_file(lock->lk); | |
434cd0cd | 1390 | free(lock->ref_name); |
1655707c | 1391 | free(lock->orig_ref_name); |
4bd18c43 SP |
1392 | free(lock); |
1393 | } | |
1394 | ||
0ec29a47 JH |
1395 | /* |
1396 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
1397 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
1398 | * because reflog file is one line per entry. | |
1399 | */ | |
1400 | static int copy_msg(char *buf, const char *msg) | |
1401 | { | |
1402 | char *cp = buf; | |
1403 | char c; | |
1404 | int wasspace = 1; | |
1405 | ||
1406 | *cp++ = '\t'; | |
1407 | while ((c = *msg++)) { | |
1408 | if (wasspace && isspace(c)) | |
1409 | continue; | |
1410 | wasspace = isspace(c); | |
1411 | if (wasspace) | |
1412 | c = ' '; | |
1413 | *cp++ = c; | |
1414 | } | |
1415 | while (buf < cp && isspace(cp[-1])) | |
1416 | cp--; | |
1417 | *cp++ = '\n'; | |
1418 | return cp - buf; | |
1419 | } | |
1420 | ||
157aaea5 | 1421 | int log_ref_setup(const char *ref_name, char *logfile, int bufsize) |
6de08ae6 | 1422 | { |
859c3017 | 1423 | int logfd, oflags = O_APPEND | O_WRONLY; |
9a13f0b7 | 1424 | |
157aaea5 | 1425 | git_snpath(logfile, bufsize, "logs/%s", ref_name); |
4057deb5 | 1426 | if (log_all_ref_updates && |
cc44c765 JH |
1427 | (!prefixcmp(ref_name, "refs/heads/") || |
1428 | !prefixcmp(ref_name, "refs/remotes/") || | |
b2e256b0 | 1429 | !prefixcmp(ref_name, "refs/notes/") || |
bd104db1 | 1430 | !strcmp(ref_name, "HEAD"))) { |
157aaea5 | 1431 | if (safe_create_leading_directories(logfile) < 0) |
6de08ae6 | 1432 | return error("unable to create directory for %s", |
157aaea5 | 1433 | logfile); |
6de08ae6 SP |
1434 | oflags |= O_CREAT; |
1435 | } | |
1436 | ||
157aaea5 | 1437 | logfd = open(logfile, oflags, 0666); |
6de08ae6 | 1438 | if (logfd < 0) { |
1974bf62 | 1439 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 1440 | return 0; |
3b463c3f JH |
1441 | |
1442 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
157aaea5 | 1443 | if (remove_empty_directories(logfile)) { |
3b463c3f | 1444 | return error("There are still logs under '%s'", |
157aaea5 | 1445 | logfile); |
3b463c3f | 1446 | } |
157aaea5 | 1447 | logfd = open(logfile, oflags, 0666); |
3b463c3f JH |
1448 | } |
1449 | ||
1450 | if (logfd < 0) | |
1451 | return error("Unable to append to %s: %s", | |
157aaea5 | 1452 | logfile, strerror(errno)); |
6de08ae6 SP |
1453 | } |
1454 | ||
157aaea5 | 1455 | adjust_shared_perm(logfile); |
859c3017 EM |
1456 | close(logfd); |
1457 | return 0; | |
1458 | } | |
443b92b6 | 1459 | |
859c3017 EM |
1460 | static int log_ref_write(const char *ref_name, const unsigned char *old_sha1, |
1461 | const unsigned char *new_sha1, const char *msg) | |
1462 | { | |
1463 | int logfd, result, written, oflags = O_APPEND | O_WRONLY; | |
1464 | unsigned maxlen, len; | |
1465 | int msglen; | |
157aaea5 | 1466 | char log_file[PATH_MAX]; |
859c3017 EM |
1467 | char *logrec; |
1468 | const char *committer; | |
1469 | ||
1470 | if (log_all_ref_updates < 0) | |
1471 | log_all_ref_updates = !is_bare_repository(); | |
1472 | ||
157aaea5 | 1473 | result = log_ref_setup(ref_name, log_file, sizeof(log_file)); |
859c3017 EM |
1474 | if (result) |
1475 | return result; | |
1476 | ||
1477 | logfd = open(log_file, oflags); | |
1478 | if (logfd < 0) | |
1479 | return 0; | |
0ec29a47 | 1480 | msglen = msg ? strlen(msg) : 0; |
774751a8 | 1481 | committer = git_committer_info(0); |
8ac65937 JH |
1482 | maxlen = strlen(committer) + msglen + 100; |
1483 | logrec = xmalloc(maxlen); | |
1484 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
1485 | sha1_to_hex(old_sha1), |
1486 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
1487 | committer); |
1488 | if (msglen) | |
0ec29a47 | 1489 | len += copy_msg(logrec + len - 1, msg) - 1; |
93822c22 | 1490 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 | 1491 | free(logrec); |
91c8d590 | 1492 | if (close(logfd) != 0 || written != len) |
9a13f0b7 | 1493 | return error("Unable to append to %s", log_file); |
6de08ae6 SP |
1494 | return 0; |
1495 | } | |
1496 | ||
c3b0dec5 LT |
1497 | static int is_branch(const char *refname) |
1498 | { | |
1499 | return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/"); | |
1500 | } | |
1501 | ||
4bd18c43 SP |
1502 | int write_ref_sha1(struct ref_lock *lock, |
1503 | const unsigned char *sha1, const char *logmsg) | |
1504 | { | |
1505 | static char term = '\n'; | |
c3b0dec5 | 1506 | struct object *o; |
4bd18c43 SP |
1507 | |
1508 | if (!lock) | |
95fc7512 | 1509 | return -1; |
a89fccd2 | 1510 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
1511 | unlock_ref(lock); |
1512 | return 0; | |
95fc7512 | 1513 | } |
c3b0dec5 LT |
1514 | o = parse_object(sha1); |
1515 | if (!o) { | |
7be8b3ba | 1516 | error("Trying to write ref %s with nonexistent object %s", |
c3b0dec5 LT |
1517 | lock->ref_name, sha1_to_hex(sha1)); |
1518 | unlock_ref(lock); | |
1519 | return -1; | |
1520 | } | |
1521 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1522 | error("Trying to write non-commit object %s to branch %s", | |
1523 | sha1_to_hex(sha1), lock->ref_name); | |
1524 | unlock_ref(lock); | |
1525 | return -1; | |
1526 | } | |
93822c22 AW |
1527 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
1528 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
b531394d | 1529 | || close_ref(lock) < 0) { |
c33d5174 | 1530 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
1531 | unlock_ref(lock); |
1532 | return -1; | |
1533 | } | |
5e290ff7 | 1534 | invalidate_cached_refs(); |
bd104db1 NP |
1535 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
1536 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
1537 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
1538 | unlock_ref(lock); |
1539 | return -1; | |
1540 | } | |
605fac8b NP |
1541 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
1542 | /* | |
1543 | * Special hack: If a branch is updated directly and HEAD | |
1544 | * points to it (may happen on the remote side of a push | |
1545 | * for example) then logically the HEAD reflog should be | |
1546 | * updated too. | |
1547 | * A generic solution implies reverse symref information, | |
1548 | * but finding all symrefs pointing to the given branch | |
1549 | * would be rather costly for this rare event (the direct | |
1550 | * update of a branch) to be worth it. So let's cheat and | |
1551 | * check with HEAD only which should cover 99% of all usage | |
1552 | * scenarios (even 100% of the default ones). | |
1553 | */ | |
1554 | unsigned char head_sha1[20]; | |
1555 | int head_flag; | |
1556 | const char *head_ref; | |
1557 | head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag); | |
1558 | if (head_ref && (head_flag & REF_ISSYMREF) && | |
1559 | !strcmp(head_ref, lock->ref_name)) | |
1560 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
1561 | } | |
b531394d | 1562 | if (commit_ref(lock)) { |
434cd0cd | 1563 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
1564 | unlock_ref(lock); |
1565 | return -1; | |
1566 | } | |
4bd18c43 SP |
1567 | unlock_ref(lock); |
1568 | return 0; | |
95fc7512 | 1569 | } |
d556fae2 | 1570 | |
8b5157e4 NP |
1571 | int create_symref(const char *ref_target, const char *refs_heads_master, |
1572 | const char *logmsg) | |
41b625b0 NP |
1573 | { |
1574 | const char *lockpath; | |
1575 | char ref[1000]; | |
1576 | int fd, len, written; | |
a4f34cbb | 1577 | char *git_HEAD = git_pathdup("%s", ref_target); |
8b5157e4 NP |
1578 | unsigned char old_sha1[20], new_sha1[20]; |
1579 | ||
1580 | if (logmsg && read_ref(ref_target, old_sha1)) | |
1581 | hashclr(old_sha1); | |
41b625b0 | 1582 | |
d48744d1 JH |
1583 | if (safe_create_leading_directories(git_HEAD) < 0) |
1584 | return error("unable to create directory for %s", git_HEAD); | |
1585 | ||
41b625b0 NP |
1586 | #ifndef NO_SYMLINK_HEAD |
1587 | if (prefer_symlink_refs) { | |
1588 | unlink(git_HEAD); | |
1589 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 1590 | goto done; |
41b625b0 NP |
1591 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
1592 | } | |
1593 | #endif | |
1594 | ||
1595 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
1596 | if (sizeof(ref) <= len) { | |
1597 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 1598 | goto error_free_return; |
41b625b0 NP |
1599 | } |
1600 | lockpath = mkpath("%s.lock", git_HEAD); | |
1601 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
1602 | if (fd < 0) { | |
1603 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 1604 | goto error_free_return; |
41b625b0 NP |
1605 | } |
1606 | written = write_in_full(fd, ref, len); | |
91c8d590 | 1607 | if (close(fd) != 0 || written != len) { |
41b625b0 | 1608 | error("Unable to write to %s", lockpath); |
47fc52e2 | 1609 | goto error_unlink_return; |
41b625b0 NP |
1610 | } |
1611 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 1612 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 1613 | goto error_unlink_return; |
41b625b0 NP |
1614 | } |
1615 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 1616 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 | 1617 | error_unlink_return: |
691f1a28 | 1618 | unlink_or_warn(lockpath); |
47fc52e2 JH |
1619 | error_free_return: |
1620 | free(git_HEAD); | |
1621 | return -1; | |
41b625b0 | 1622 | } |
8b5157e4 | 1623 | |
ee96d11b | 1624 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 1625 | done: |
ee96d11b | 1626 | #endif |
8b5157e4 NP |
1627 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
1628 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
1629 | ||
47fc52e2 | 1630 | free(git_HEAD); |
41b625b0 NP |
1631 | return 0; |
1632 | } | |
1633 | ||
16d7cc90 JH |
1634 | static char *ref_msg(const char *line, const char *endp) |
1635 | { | |
1636 | const char *ep; | |
16d7cc90 | 1637 | line += 82; |
182af834 PH |
1638 | ep = memchr(line, '\n', endp - line); |
1639 | if (!ep) | |
1640 | ep = endp; | |
1641 | return xmemdupz(line, ep - line); | |
16d7cc90 JH |
1642 | } |
1643 | ||
1644 | 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 | 1645 | { |
e5229042 | 1646 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 | 1647 | char *tz_c; |
e29cb53a | 1648 | int logfd, tz, reccnt = 0; |
d556fae2 SP |
1649 | struct stat st; |
1650 | unsigned long date; | |
e5229042 | 1651 | unsigned char logged_sha1[20]; |
cb48cb58 | 1652 | void *log_mapped; |
dc49cd76 | 1653 | size_t mapsz; |
d556fae2 SP |
1654 | |
1655 | logfile = git_path("logs/%s", ref); | |
1656 | logfd = open(logfile, O_RDONLY, 0); | |
1657 | if (logfd < 0) | |
d824cbba | 1658 | die_errno("Unable to read log '%s'", logfile); |
d556fae2 SP |
1659 | fstat(logfd, &st); |
1660 | if (!st.st_size) | |
1661 | die("Log %s is empty.", logfile); | |
dc49cd76 SP |
1662 | mapsz = xsize_t(st.st_size); |
1663 | log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0); | |
cb48cb58 | 1664 | logdata = log_mapped; |
d556fae2 SP |
1665 | close(logfd); |
1666 | ||
e5229042 | 1667 | lastrec = NULL; |
d556fae2 SP |
1668 | rec = logend = logdata + st.st_size; |
1669 | while (logdata < rec) { | |
e29cb53a | 1670 | reccnt++; |
d556fae2 SP |
1671 | if (logdata < rec && *(rec-1) == '\n') |
1672 | rec--; | |
e5229042 SP |
1673 | lastgt = NULL; |
1674 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 1675 | rec--; |
e5229042 SP |
1676 | if (*rec == '>') |
1677 | lastgt = rec; | |
1678 | } | |
1679 | if (!lastgt) | |
d556fae2 | 1680 | die("Log %s is corrupt.", logfile); |
e5229042 | 1681 | date = strtoul(lastgt + 1, &tz_c, 10); |
ab2a1a32 | 1682 | if (date <= at_time || cnt == 0) { |
76a44c5c | 1683 | tz = strtoul(tz_c, NULL, 10); |
16d7cc90 JH |
1684 | if (msg) |
1685 | *msg = ref_msg(rec, logend); | |
1686 | if (cutoff_time) | |
1687 | *cutoff_time = date; | |
1688 | if (cutoff_tz) | |
1689 | *cutoff_tz = tz; | |
1690 | if (cutoff_cnt) | |
76a44c5c | 1691 | *cutoff_cnt = reccnt - 1; |
e5229042 SP |
1692 | if (lastrec) { |
1693 | if (get_sha1_hex(lastrec, logged_sha1)) | |
1694 | die("Log %s is corrupt.", logfile); | |
1695 | if (get_sha1_hex(rec + 41, sha1)) | |
1696 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1697 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1698 | warning("Log %s has gap after %s.", |
73013afd | 1699 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 | 1700 | } |
e5f38ec3 JH |
1701 | } |
1702 | else if (date == at_time) { | |
e5229042 SP |
1703 | if (get_sha1_hex(rec + 41, sha1)) |
1704 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
1705 | } |
1706 | else { | |
e5229042 SP |
1707 | if (get_sha1_hex(rec + 41, logged_sha1)) |
1708 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1709 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1710 | warning("Log %s unexpectedly ended on %s.", |
73013afd | 1711 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 SP |
1712 | } |
1713 | } | |
dc49cd76 | 1714 | munmap(log_mapped, mapsz); |
d556fae2 SP |
1715 | return 0; |
1716 | } | |
e5229042 | 1717 | lastrec = rec; |
ab2a1a32 JH |
1718 | if (cnt > 0) |
1719 | cnt--; | |
d556fae2 SP |
1720 | } |
1721 | ||
e5229042 SP |
1722 | rec = logdata; |
1723 | while (rec < logend && *rec != '>' && *rec != '\n') | |
1724 | rec++; | |
1725 | if (rec == logend || *rec == '\n') | |
d556fae2 | 1726 | die("Log %s is corrupt.", logfile); |
e5229042 | 1727 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
1728 | tz = strtoul(tz_c, NULL, 10); |
1729 | if (get_sha1_hex(logdata, sha1)) | |
1730 | die("Log %s is corrupt.", logfile); | |
d1a4489a JK |
1731 | if (is_null_sha1(sha1)) { |
1732 | if (get_sha1_hex(logdata + 41, sha1)) | |
1733 | die("Log %s is corrupt.", logfile); | |
1734 | } | |
16d7cc90 JH |
1735 | if (msg) |
1736 | *msg = ref_msg(logdata, logend); | |
dc49cd76 | 1737 | munmap(log_mapped, mapsz); |
16d7cc90 JH |
1738 | |
1739 | if (cutoff_time) | |
1740 | *cutoff_time = date; | |
1741 | if (cutoff_tz) | |
1742 | *cutoff_tz = tz; | |
1743 | if (cutoff_cnt) | |
1744 | *cutoff_cnt = reccnt; | |
1745 | return 1; | |
d556fae2 | 1746 | } |
2ff81662 | 1747 | |
101d15e0 | 1748 | int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long ofs, void *cb_data) |
2ff81662 JH |
1749 | { |
1750 | const char *logfile; | |
1751 | FILE *logfp; | |
8ca78803 | 1752 | struct strbuf sb = STRBUF_INIT; |
2266bf27 | 1753 | int ret = 0; |
2ff81662 JH |
1754 | |
1755 | logfile = git_path("logs/%s", ref); | |
1756 | logfp = fopen(logfile, "r"); | |
1757 | if (!logfp) | |
883d60fa | 1758 | return -1; |
101d15e0 JH |
1759 | |
1760 | if (ofs) { | |
1761 | struct stat statbuf; | |
1762 | if (fstat(fileno(logfp), &statbuf) || | |
1763 | statbuf.st_size < ofs || | |
1764 | fseek(logfp, -ofs, SEEK_END) || | |
8ca78803 | 1765 | strbuf_getwholeline(&sb, logfp, '\n')) { |
9d33f7c2 | 1766 | fclose(logfp); |
8ca78803 | 1767 | strbuf_release(&sb); |
101d15e0 | 1768 | return -1; |
9d33f7c2 | 1769 | } |
101d15e0 JH |
1770 | } |
1771 | ||
8ca78803 | 1772 | while (!strbuf_getwholeline(&sb, logfp, '\n')) { |
2ff81662 | 1773 | unsigned char osha1[20], nsha1[20]; |
883d60fa JS |
1774 | char *email_end, *message; |
1775 | unsigned long timestamp; | |
8ca78803 | 1776 | int tz; |
2ff81662 JH |
1777 | |
1778 | /* old SP new SP name <email> SP time TAB msg LF */ | |
8ca78803 RS |
1779 | if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' || |
1780 | get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' || | |
1781 | get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' || | |
1782 | !(email_end = strchr(sb.buf + 82, '>')) || | |
883d60fa JS |
1783 | email_end[1] != ' ' || |
1784 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
1785 | !message || message[0] != ' ' || | |
1786 | (message[1] != '+' && message[1] != '-') || | |
1787 | !isdigit(message[2]) || !isdigit(message[3]) || | |
b4dd4856 | 1788 | !isdigit(message[4]) || !isdigit(message[5])) |
2ff81662 | 1789 | continue; /* corrupt? */ |
883d60fa JS |
1790 | email_end[1] = '\0'; |
1791 | tz = strtol(message + 1, NULL, 10); | |
b4dd4856 JS |
1792 | if (message[6] != '\t') |
1793 | message += 6; | |
1794 | else | |
1795 | message += 7; | |
8ca78803 RS |
1796 | ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message, |
1797 | cb_data); | |
883d60fa | 1798 | if (ret) |
2266bf27 | 1799 | break; |
2ff81662 JH |
1800 | } |
1801 | fclose(logfp); | |
8ca78803 | 1802 | strbuf_release(&sb); |
2266bf27 | 1803 | return ret; |
2ff81662 | 1804 | } |
e29cb53a | 1805 | |
101d15e0 JH |
1806 | int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data) |
1807 | { | |
1808 | return for_each_recent_reflog_ent(ref, fn, 0, cb_data); | |
1809 | } | |
1810 | ||
eb8381c8 NP |
1811 | static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data) |
1812 | { | |
1813 | DIR *dir = opendir(git_path("logs/%s", base)); | |
fcee5a14 | 1814 | int retval = 0; |
eb8381c8 NP |
1815 | |
1816 | if (dir) { | |
1817 | struct dirent *de; | |
1818 | int baselen = strlen(base); | |
1819 | char *log = xmalloc(baselen + 257); | |
1820 | ||
1821 | memcpy(log, base, baselen); | |
1822 | if (baselen && base[baselen-1] != '/') | |
1823 | log[baselen++] = '/'; | |
1824 | ||
1825 | while ((de = readdir(dir)) != NULL) { | |
1826 | struct stat st; | |
1827 | int namelen; | |
1828 | ||
1829 | if (de->d_name[0] == '.') | |
1830 | continue; | |
1831 | namelen = strlen(de->d_name); | |
1832 | if (namelen > 255) | |
1833 | continue; | |
1834 | if (has_extension(de->d_name, ".lock")) | |
1835 | continue; | |
1836 | memcpy(log + baselen, de->d_name, namelen+1); | |
1837 | if (stat(git_path("logs/%s", log), &st) < 0) | |
1838 | continue; | |
1839 | if (S_ISDIR(st.st_mode)) { | |
1840 | retval = do_for_each_reflog(log, fn, cb_data); | |
1841 | } else { | |
1842 | unsigned char sha1[20]; | |
1843 | if (!resolve_ref(log, sha1, 0, NULL)) | |
1844 | retval = error("bad ref for %s", log); | |
1845 | else | |
1846 | retval = fn(log, sha1, 0, cb_data); | |
1847 | } | |
1848 | if (retval) | |
1849 | break; | |
1850 | } | |
1851 | free(log); | |
1852 | closedir(dir); | |
1853 | } | |
acb39f64 | 1854 | else if (*base) |
fcee5a14 | 1855 | return errno; |
eb8381c8 NP |
1856 | return retval; |
1857 | } | |
1858 | ||
1859 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
1860 | { | |
1861 | return do_for_each_reflog("", fn, cb_data); | |
1862 | } | |
3d9f037c CR |
1863 | |
1864 | int update_ref(const char *action, const char *refname, | |
1865 | const unsigned char *sha1, const unsigned char *oldval, | |
1866 | int flags, enum action_on_err onerr) | |
1867 | { | |
1868 | static struct ref_lock *lock; | |
1869 | lock = lock_any_ref_for_update(refname, oldval, flags); | |
1870 | if (!lock) { | |
1871 | const char *str = "Cannot lock the ref '%s'."; | |
1872 | switch (onerr) { | |
1873 | case MSG_ON_ERR: error(str, refname); break; | |
1874 | case DIE_ON_ERR: die(str, refname); break; | |
1875 | case QUIET_ON_ERR: break; | |
1876 | } | |
1877 | return 1; | |
1878 | } | |
1879 | if (write_ref_sha1(lock, sha1, action) < 0) { | |
1880 | const char *str = "Cannot update the ref '%s'."; | |
1881 | switch (onerr) { | |
1882 | case MSG_ON_ERR: error(str, refname); break; | |
1883 | case DIE_ON_ERR: die(str, refname); break; | |
1884 | case QUIET_ON_ERR: break; | |
1885 | } | |
1886 | return 1; | |
1887 | } | |
1888 | return 0; | |
1889 | } | |
cda69f48 | 1890 | |
c17b2294 JH |
1891 | int ref_exists(char *refname) |
1892 | { | |
1893 | unsigned char sha1[20]; | |
1894 | return !!resolve_ref(refname, sha1, 1, NULL); | |
1895 | } | |
1896 | ||
5483f799 | 1897 | struct ref *find_ref_by_name(const struct ref *list, const char *name) |
cda69f48 JK |
1898 | { |
1899 | for ( ; list; list = list->next) | |
1900 | if (!strcmp(list->name, name)) | |
5483f799 | 1901 | return (struct ref *)list; |
cda69f48 JK |
1902 | return NULL; |
1903 | } | |
7c2b3029 JK |
1904 | |
1905 | /* | |
1906 | * generate a format suitable for scanf from a ref_rev_parse_rules | |
1907 | * rule, that is replace the "%.*s" spec with a "%s" spec | |
1908 | */ | |
1909 | static void gen_scanf_fmt(char *scanf_fmt, const char *rule) | |
1910 | { | |
1911 | char *spec; | |
1912 | ||
1913 | spec = strstr(rule, "%.*s"); | |
1914 | if (!spec || strstr(spec + 4, "%.*s")) | |
1915 | die("invalid rule in ref_rev_parse_rules: %s", rule); | |
1916 | ||
1917 | /* copy all until spec */ | |
1918 | strncpy(scanf_fmt, rule, spec - rule); | |
1919 | scanf_fmt[spec - rule] = '\0'; | |
1920 | /* copy new spec */ | |
1921 | strcat(scanf_fmt, "%s"); | |
1922 | /* copy remaining rule */ | |
1923 | strcat(scanf_fmt, spec + 4); | |
1924 | ||
1925 | return; | |
1926 | } | |
1927 | ||
6e7b3309 | 1928 | char *shorten_unambiguous_ref(const char *ref, int strict) |
7c2b3029 JK |
1929 | { |
1930 | int i; | |
1931 | static char **scanf_fmts; | |
1932 | static int nr_rules; | |
1933 | char *short_name; | |
1934 | ||
1935 | /* pre generate scanf formats from ref_rev_parse_rules[] */ | |
1936 | if (!nr_rules) { | |
1937 | size_t total_len = 0; | |
1938 | ||
1939 | /* the rule list is NULL terminated, count them first */ | |
1940 | for (; ref_rev_parse_rules[nr_rules]; nr_rules++) | |
1941 | /* no +1 because strlen("%s") < strlen("%.*s") */ | |
1942 | total_len += strlen(ref_rev_parse_rules[nr_rules]); | |
1943 | ||
1944 | scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len); | |
1945 | ||
1946 | total_len = 0; | |
1947 | for (i = 0; i < nr_rules; i++) { | |
1948 | scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] | |
1949 | + total_len; | |
1950 | gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]); | |
1951 | total_len += strlen(ref_rev_parse_rules[i]); | |
1952 | } | |
1953 | } | |
1954 | ||
1955 | /* bail out if there are no rules */ | |
1956 | if (!nr_rules) | |
1957 | return xstrdup(ref); | |
1958 | ||
1959 | /* buffer for scanf result, at most ref must fit */ | |
1960 | short_name = xstrdup(ref); | |
1961 | ||
1962 | /* skip first rule, it will always match */ | |
1963 | for (i = nr_rules - 1; i > 0 ; --i) { | |
1964 | int j; | |
6e7b3309 | 1965 | int rules_to_fail = i; |
7c2b3029 JK |
1966 | int short_name_len; |
1967 | ||
1968 | if (1 != sscanf(ref, scanf_fmts[i], short_name)) | |
1969 | continue; | |
1970 | ||
1971 | short_name_len = strlen(short_name); | |
1972 | ||
6e7b3309 BW |
1973 | /* |
1974 | * in strict mode, all (except the matched one) rules | |
1975 | * must fail to resolve to a valid non-ambiguous ref | |
1976 | */ | |
1977 | if (strict) | |
1978 | rules_to_fail = nr_rules; | |
1979 | ||
7c2b3029 JK |
1980 | /* |
1981 | * check if the short name resolves to a valid ref, | |
1982 | * but use only rules prior to the matched one | |
1983 | */ | |
6e7b3309 | 1984 | for (j = 0; j < rules_to_fail; j++) { |
7c2b3029 JK |
1985 | const char *rule = ref_rev_parse_rules[j]; |
1986 | unsigned char short_objectname[20]; | |
1987 | char refname[PATH_MAX]; | |
1988 | ||
6e7b3309 BW |
1989 | /* skip matched rule */ |
1990 | if (i == j) | |
1991 | continue; | |
1992 | ||
7c2b3029 JK |
1993 | /* |
1994 | * the short name is ambiguous, if it resolves | |
1995 | * (with this previous rule) to a valid ref | |
1996 | * read_ref() returns 0 on success | |
1997 | */ | |
1998 | mksnpath(refname, sizeof(refname), | |
1999 | rule, short_name_len, short_name); | |
2000 | if (!read_ref(refname, short_objectname)) | |
2001 | break; | |
2002 | } | |
2003 | ||
2004 | /* | |
2005 | * short name is non-ambiguous if all previous rules | |
2006 | * haven't resolved to a valid ref | |
2007 | */ | |
6e7b3309 | 2008 | if (j == rules_to_fail) |
7c2b3029 JK |
2009 | return short_name; |
2010 | } | |
2011 | ||
2012 | free(short_name); | |
2013 | return xstrdup(ref); | |
2014 | } |