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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 | } | |
b4f223c6 | 322 | return 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); | |
b4f223c6 | 364 | submodule_refs.loose = sort_ref_list(submodule_refs.loose); |
0bad611b HV |
365 | return submodule_refs.loose; |
366 | } | |
367 | ||
5e290ff7 | 368 | if (!cached_refs.did_loose) { |
0bad611b | 369 | cached_refs.loose = get_ref_dir(NULL, "refs", NULL); |
b4f223c6 | 370 | cached_refs.loose = sort_ref_list(cached_refs.loose); |
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 | ||
456 | tmp = read_gitfile_gently(gitdir); | |
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 | |
4886b89f CC |
470 | /* |
471 | * If the "reading" argument is set, this function finds out what _object_ | |
472 | * the ref points at by "reading" the ref. The ref, if it is not symbolic, | |
473 | * has to exist, and if it is symbolic, it has to point at an existing ref, | |
474 | * because the "read" goes through the symref to the ref it points at. | |
475 | * | |
476 | * The access that is not "reading" may often be "writing", but does not | |
477 | * have to; it can be merely checking _where it leads to_. If it is a | |
478 | * prelude to "writing" to the ref, a write to a symref that points at | |
479 | * yet-to-be-born ref will create the real ref pointed by the symref. | |
480 | * reading=0 allows the caller to check where such a symref leads to. | |
481 | */ | |
8da19775 | 482 | const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 483 | { |
0104ca09 HO |
484 | int depth = MAXDEPTH; |
485 | ssize_t len; | |
a876ed83 | 486 | char buffer[256]; |
ed378ec7 | 487 | static char ref_buffer[256]; |
ca8db142 | 488 | |
8da19775 JH |
489 | if (flag) |
490 | *flag = 0; | |
491 | ||
a876ed83 | 492 | for (;;) { |
958a4789 | 493 | char path[PATH_MAX]; |
a876ed83 JH |
494 | struct stat st; |
495 | char *buf; | |
496 | int fd; | |
8a65ff76 | 497 | |
a876ed83 JH |
498 | if (--depth < 0) |
499 | return NULL; | |
ca8db142 | 500 | |
958a4789 | 501 | git_snpath(path, sizeof(path), "%s", ref); |
4886b89f | 502 | /* Special case: non-existing file. */ |
a876ed83 | 503 | if (lstat(path, &st) < 0) { |
0bad611b | 504 | struct ref_list *list = get_packed_refs(NULL); |
434cd0cd | 505 | while (list) { |
f4204ab9 | 506 | if (!strcmp(ref, list->name)) { |
434cd0cd | 507 | hashcpy(sha1, list->sha1); |
8da19775 JH |
508 | if (flag) |
509 | *flag |= REF_ISPACKED; | |
434cd0cd LT |
510 | return ref; |
511 | } | |
512 | list = list->next; | |
513 | } | |
a876ed83 JH |
514 | if (reading || errno != ENOENT) |
515 | return NULL; | |
e702496e | 516 | hashclr(sha1); |
ed378ec7 | 517 | return ref; |
a876ed83 | 518 | } |
ca8db142 | 519 | |
a876ed83 JH |
520 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
521 | if (S_ISLNK(st.st_mode)) { | |
522 | len = readlink(path, buffer, sizeof(buffer)-1); | |
523 | if (len >= 5 && !memcmp("refs/", buffer, 5)) { | |
ed378ec7 LT |
524 | buffer[len] = 0; |
525 | strcpy(ref_buffer, buffer); | |
526 | ref = ref_buffer; | |
8da19775 JH |
527 | if (flag) |
528 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
529 | continue; |
530 | } | |
ca8db142 | 531 | } |
a876ed83 | 532 | |
7a21632f DS |
533 | /* Is it a directory? */ |
534 | if (S_ISDIR(st.st_mode)) { | |
535 | errno = EISDIR; | |
536 | return NULL; | |
537 | } | |
538 | ||
a876ed83 JH |
539 | /* |
540 | * Anything else, just open it and try to use it as | |
541 | * a ref | |
542 | */ | |
543 | fd = open(path, O_RDONLY); | |
544 | if (fd < 0) | |
545 | return NULL; | |
93d26e4c | 546 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
a876ed83 JH |
547 | close(fd); |
548 | ||
549 | /* | |
550 | * Is it a symbolic ref? | |
551 | */ | |
552 | if (len < 4 || memcmp("ref:", buffer, 4)) | |
553 | break; | |
554 | buf = buffer + 4; | |
555 | len -= 4; | |
556 | while (len && isspace(*buf)) | |
557 | buf++, len--; | |
558 | while (len && isspace(buf[len-1])) | |
ed378ec7 LT |
559 | len--; |
560 | buf[len] = 0; | |
561 | memcpy(ref_buffer, buf, len + 1); | |
562 | ref = ref_buffer; | |
8da19775 JH |
563 | if (flag) |
564 | *flag |= REF_ISSYMREF; | |
8a65ff76 | 565 | } |
a876ed83 JH |
566 | if (len < 40 || get_sha1_hex(buffer, sha1)) |
567 | return NULL; | |
ed378ec7 | 568 | return ref; |
a876ed83 JH |
569 | } |
570 | ||
d08bae7e IL |
571 | /* The argument to filter_refs */ |
572 | struct ref_filter { | |
573 | const char *pattern; | |
574 | each_ref_fn *fn; | |
575 | void *cb_data; | |
576 | }; | |
577 | ||
ed378ec7 | 578 | int read_ref(const char *ref, unsigned char *sha1) |
a876ed83 | 579 | { |
8da19775 | 580 | if (resolve_ref(ref, sha1, 1, NULL)) |
a876ed83 JH |
581 | return 0; |
582 | return -1; | |
8a65ff76 LT |
583 | } |
584 | ||
f8948e2f | 585 | #define DO_FOR_EACH_INCLUDE_BROKEN 01 |
ef06b918 | 586 | static int do_one_ref(const char *base, each_ref_fn fn, int trim, |
f8948e2f | 587 | int flags, void *cb_data, struct ref_list *entry) |
ef06b918 JH |
588 | { |
589 | if (strncmp(base, entry->name, trim)) | |
590 | return 0; | |
e01de1c9 | 591 | |
f8948e2f | 592 | if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) { |
e01de1c9 JH |
593 | if (entry->flag & REF_BROKEN) |
594 | return 0; /* ignore dangling symref */ | |
f8948e2f JH |
595 | if (!has_sha1_file(entry->sha1)) { |
596 | error("%s does not point to a valid object!", entry->name); | |
597 | return 0; | |
598 | } | |
ef06b918 | 599 | } |
0ae91be0 | 600 | current_ref = entry; |
ef06b918 JH |
601 | return fn(entry->name + trim, entry->sha1, entry->flag, cb_data); |
602 | } | |
603 | ||
d08bae7e IL |
604 | static int filter_refs(const char *ref, const unsigned char *sha, int flags, |
605 | void *data) | |
606 | { | |
607 | struct ref_filter *filter = (struct ref_filter *)data; | |
608 | if (fnmatch(filter->pattern, ref, 0)) | |
609 | return 0; | |
610 | return filter->fn(ref, sha, flags, filter->cb_data); | |
611 | } | |
612 | ||
cf0adba7 JH |
613 | int peel_ref(const char *ref, unsigned char *sha1) |
614 | { | |
615 | int flag; | |
616 | unsigned char base[20]; | |
617 | struct object *o; | |
618 | ||
0ae91be0 SP |
619 | if (current_ref && (current_ref->name == ref |
620 | || !strcmp(current_ref->name, ref))) { | |
621 | if (current_ref->flag & REF_KNOWS_PEELED) { | |
622 | hashcpy(sha1, current_ref->peeled); | |
623 | return 0; | |
624 | } | |
625 | hashcpy(base, current_ref->sha1); | |
626 | goto fallback; | |
627 | } | |
628 | ||
cf0adba7 JH |
629 | if (!resolve_ref(ref, base, 1, &flag)) |
630 | return -1; | |
631 | ||
632 | if ((flag & REF_ISPACKED)) { | |
0bad611b | 633 | struct ref_list *list = get_packed_refs(NULL); |
cf0adba7 JH |
634 | |
635 | while (list) { | |
f4204ab9 JH |
636 | if (!strcmp(list->name, ref)) { |
637 | if (list->flag & REF_KNOWS_PEELED) { | |
638 | hashcpy(sha1, list->peeled); | |
639 | return 0; | |
640 | } | |
641 | /* older pack-refs did not leave peeled ones */ | |
642 | break; | |
cf0adba7 JH |
643 | } |
644 | list = list->next; | |
645 | } | |
cf0adba7 JH |
646 | } |
647 | ||
0ae91be0 | 648 | fallback: |
cf0adba7 | 649 | o = parse_object(base); |
8c87dc77 | 650 | if (o && o->type == OBJ_TAG) { |
cf0adba7 JH |
651 | o = deref_tag(o, ref, 0); |
652 | if (o) { | |
653 | hashcpy(sha1, o->sha1); | |
654 | return 0; | |
655 | } | |
656 | } | |
657 | return -1; | |
658 | } | |
659 | ||
0bad611b HV |
660 | static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn, |
661 | int trim, int flags, void *cb_data) | |
8a65ff76 | 662 | { |
0ae91be0 | 663 | int retval = 0; |
0bad611b HV |
664 | struct ref_list *packed = get_packed_refs(submodule); |
665 | struct ref_list *loose = get_loose_refs(submodule); | |
8a65ff76 | 666 | |
e142a3c6 DB |
667 | struct ref_list *extra; |
668 | ||
669 | for (extra = extra_refs; extra; extra = extra->next) | |
f8948e2f | 670 | retval = do_one_ref(base, fn, trim, flags, cb_data, extra); |
e142a3c6 | 671 | |
e1e22e37 LT |
672 | while (packed && loose) { |
673 | struct ref_list *entry; | |
674 | int cmp = strcmp(packed->name, loose->name); | |
675 | if (!cmp) { | |
676 | packed = packed->next; | |
677 | continue; | |
6cada6a9 | 678 | } |
e1e22e37 LT |
679 | if (cmp > 0) { |
680 | entry = loose; | |
681 | loose = loose->next; | |
682 | } else { | |
683 | entry = packed; | |
684 | packed = packed->next; | |
685 | } | |
f8948e2f | 686 | retval = do_one_ref(base, fn, trim, flags, cb_data, entry); |
e1e22e37 | 687 | if (retval) |
0ae91be0 | 688 | goto end_each; |
e1e22e37 | 689 | } |
8a65ff76 | 690 | |
ef06b918 | 691 | for (packed = packed ? packed : loose; packed; packed = packed->next) { |
f8948e2f | 692 | retval = do_one_ref(base, fn, trim, flags, cb_data, packed); |
ef06b918 | 693 | if (retval) |
0ae91be0 | 694 | goto end_each; |
8a65ff76 | 695 | } |
0ae91be0 SP |
696 | |
697 | end_each: | |
698 | current_ref = NULL; | |
699 | return retval; | |
8a65ff76 LT |
700 | } |
701 | ||
0bad611b HV |
702 | |
703 | static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data) | |
723c31fe LT |
704 | { |
705 | unsigned char sha1[20]; | |
8da19775 JH |
706 | int flag; |
707 | ||
0bad611b HV |
708 | if (submodule) { |
709 | if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0) | |
710 | return fn("HEAD", sha1, 0, cb_data); | |
711 | ||
712 | return 0; | |
713 | } | |
714 | ||
8da19775 JH |
715 | if (resolve_ref("HEAD", sha1, 1, &flag)) |
716 | return fn("HEAD", sha1, flag, cb_data); | |
0bad611b | 717 | |
2f34ba32 | 718 | return 0; |
723c31fe LT |
719 | } |
720 | ||
0bad611b HV |
721 | int head_ref(each_ref_fn fn, void *cb_data) |
722 | { | |
723 | return do_head_ref(NULL, fn, cb_data); | |
724 | } | |
725 | ||
9ef6aeb0 HV |
726 | int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
727 | { | |
728 | return do_head_ref(submodule, fn, cb_data); | |
729 | } | |
730 | ||
cb5d709f | 731 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 732 | { |
0bad611b | 733 | return do_for_each_ref(NULL, "refs/", fn, 0, 0, cb_data); |
a62be77f SE |
734 | } |
735 | ||
9ef6aeb0 HV |
736 | int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
737 | { | |
738 | return do_for_each_ref(submodule, "refs/", fn, 0, 0, cb_data); | |
a62be77f SE |
739 | } |
740 | ||
2a8177b6 CC |
741 | int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data) |
742 | { | |
0bad611b | 743 | return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data); |
2a8177b6 CC |
744 | } |
745 | ||
9ef6aeb0 HV |
746 | int for_each_ref_in_submodule(const char *submodule, const char *prefix, |
747 | each_ref_fn fn, void *cb_data) | |
748 | { | |
749 | return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data); | |
2a8177b6 CC |
750 | } |
751 | ||
cb5d709f | 752 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 753 | { |
2a8177b6 | 754 | return for_each_ref_in("refs/tags/", fn, cb_data); |
a62be77f SE |
755 | } |
756 | ||
9ef6aeb0 HV |
757 | int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
758 | { | |
759 | return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data); | |
760 | } | |
761 | ||
cb5d709f | 762 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 763 | { |
2a8177b6 | 764 | return for_each_ref_in("refs/heads/", fn, cb_data); |
a62be77f SE |
765 | } |
766 | ||
9ef6aeb0 HV |
767 | int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
768 | { | |
769 | return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data); | |
770 | } | |
771 | ||
cb5d709f | 772 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 773 | { |
2a8177b6 | 774 | return for_each_ref_in("refs/remotes/", fn, cb_data); |
f8948e2f JH |
775 | } |
776 | ||
9ef6aeb0 HV |
777 | int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
778 | { | |
779 | return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data); | |
780 | } | |
781 | ||
29268700 CC |
782 | int for_each_replace_ref(each_ref_fn fn, void *cb_data) |
783 | { | |
0bad611b | 784 | return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data); |
29268700 CC |
785 | } |
786 | ||
b09fe971 IL |
787 | int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, |
788 | const char *prefix, void *cb_data) | |
d08bae7e IL |
789 | { |
790 | struct strbuf real_pattern = STRBUF_INIT; | |
791 | struct ref_filter filter; | |
d08bae7e IL |
792 | int ret; |
793 | ||
b09fe971 | 794 | if (!prefix && prefixcmp(pattern, "refs/")) |
d08bae7e | 795 | strbuf_addstr(&real_pattern, "refs/"); |
b09fe971 IL |
796 | else if (prefix) |
797 | strbuf_addstr(&real_pattern, prefix); | |
d08bae7e IL |
798 | strbuf_addstr(&real_pattern, pattern); |
799 | ||
894a9d33 | 800 | if (!has_glob_specials(pattern)) { |
9517e6b8 | 801 | /* Append implied '/' '*' if not present. */ |
d08bae7e IL |
802 | if (real_pattern.buf[real_pattern.len - 1] != '/') |
803 | strbuf_addch(&real_pattern, '/'); | |
804 | /* No need to check for '*', there is none. */ | |
805 | strbuf_addch(&real_pattern, '*'); | |
806 | } | |
807 | ||
808 | filter.pattern = real_pattern.buf; | |
809 | filter.fn = fn; | |
810 | filter.cb_data = cb_data; | |
811 | ret = for_each_ref(filter_refs, &filter); | |
812 | ||
813 | strbuf_release(&real_pattern); | |
814 | return ret; | |
815 | } | |
816 | ||
b09fe971 IL |
817 | int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data) |
818 | { | |
819 | return for_each_glob_ref_in(fn, pattern, NULL, cb_data); | |
820 | } | |
821 | ||
f8948e2f JH |
822 | int for_each_rawref(each_ref_fn fn, void *cb_data) |
823 | { | |
0bad611b | 824 | return do_for_each_ref(NULL, "refs/", fn, 0, |
f8948e2f | 825 | DO_FOR_EACH_INCLUDE_BROKEN, cb_data); |
8a65ff76 LT |
826 | } |
827 | ||
03feddd6 JH |
828 | /* |
829 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
830 | * We do not like it if: | |
831 | * | |
832 | * - any path component of it begins with ".", or | |
833 | * - it has double dots "..", or | |
834 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
835 | * - it ends with a "/". | |
3e262b95 | 836 | * - it ends with ".lock" |
a4c2e699 | 837 | * - it contains a "\" (backslash) |
03feddd6 JH |
838 | */ |
839 | ||
840 | static inline int bad_ref_char(int ch) | |
841 | { | |
8558fd9e | 842 | if (((unsigned) ch) <= ' ' || |
a4c2e699 | 843 | ch == '~' || ch == '^' || ch == ':' || ch == '\\') |
8558fd9e DB |
844 | return 1; |
845 | /* 2.13 Pattern Matching Notation */ | |
846 | if (ch == '?' || ch == '[') /* Unsupported */ | |
847 | return 1; | |
848 | if (ch == '*') /* Supported at the end */ | |
849 | return 2; | |
850 | return 0; | |
03feddd6 JH |
851 | } |
852 | ||
95fc7512 DB |
853 | int check_ref_format(const char *ref) |
854 | { | |
cbdffe40 | 855 | int ch, level, bad_type, last; |
abd2bde7 | 856 | int ret = CHECK_REF_FORMAT_OK; |
03feddd6 JH |
857 | const char *cp = ref; |
858 | ||
859 | level = 0; | |
860 | while (1) { | |
861 | while ((ch = *cp++) == '/') | |
862 | ; /* tolerate duplicated slashes */ | |
863 | if (!ch) | |
5f7b202a JH |
864 | /* should not end with slashes */ |
865 | return CHECK_REF_FORMAT_ERROR; | |
03feddd6 JH |
866 | |
867 | /* we are at the beginning of the path component */ | |
8558fd9e | 868 | if (ch == '.') |
5f7b202a | 869 | return CHECK_REF_FORMAT_ERROR; |
8558fd9e DB |
870 | bad_type = bad_ref_char(ch); |
871 | if (bad_type) { | |
abd2bde7 DB |
872 | if (bad_type == 2 && (!*cp || *cp == '/') && |
873 | ret == CHECK_REF_FORMAT_OK) | |
874 | ret = CHECK_REF_FORMAT_WILDCARD; | |
875 | else | |
876 | return CHECK_REF_FORMAT_ERROR; | |
8558fd9e | 877 | } |
03feddd6 | 878 | |
cbdffe40 | 879 | last = ch; |
03feddd6 JH |
880 | /* scan the rest of the path component */ |
881 | while ((ch = *cp++) != 0) { | |
8558fd9e | 882 | bad_type = bad_ref_char(ch); |
cbdffe40 | 883 | if (bad_type) |
08fbdb30 | 884 | return CHECK_REF_FORMAT_ERROR; |
03feddd6 JH |
885 | if (ch == '/') |
886 | break; | |
cbdffe40 JH |
887 | if (last == '.' && ch == '.') |
888 | return CHECK_REF_FORMAT_ERROR; | |
889 | if (last == '@' && ch == '{') | |
5f7b202a | 890 | return CHECK_REF_FORMAT_ERROR; |
cbdffe40 | 891 | last = ch; |
03feddd6 JH |
892 | } |
893 | level++; | |
894 | if (!ch) { | |
cbdffe40 JH |
895 | if (ref <= cp - 2 && cp[-2] == '.') |
896 | return CHECK_REF_FORMAT_ERROR; | |
03feddd6 | 897 | if (level < 2) |
5f7b202a | 898 | return CHECK_REF_FORMAT_ONELEVEL; |
3e262b95 SP |
899 | if (has_extension(ref, ".lock")) |
900 | return CHECK_REF_FORMAT_ERROR; | |
abd2bde7 | 901 | return ret; |
03feddd6 JH |
902 | } |
903 | } | |
95fc7512 DB |
904 | } |
905 | ||
4577e483 | 906 | const char *prettify_refname(const char *name) |
a9c37a72 | 907 | { |
a9c37a72 DB |
908 | return name + ( |
909 | !prefixcmp(name, "refs/heads/") ? 11 : | |
910 | !prefixcmp(name, "refs/tags/") ? 10 : | |
911 | !prefixcmp(name, "refs/remotes/") ? 13 : | |
912 | 0); | |
913 | } | |
914 | ||
79803322 SP |
915 | const char *ref_rev_parse_rules[] = { |
916 | "%.*s", | |
917 | "refs/%.*s", | |
918 | "refs/tags/%.*s", | |
919 | "refs/heads/%.*s", | |
920 | "refs/remotes/%.*s", | |
921 | "refs/remotes/%.*s/HEAD", | |
922 | NULL | |
923 | }; | |
924 | ||
605b4978 SP |
925 | const char *ref_fetch_rules[] = { |
926 | "%.*s", | |
927 | "refs/%.*s", | |
928 | "refs/heads/%.*s", | |
929 | NULL | |
930 | }; | |
931 | ||
79803322 SP |
932 | int refname_match(const char *abbrev_name, const char *full_name, const char **rules) |
933 | { | |
934 | const char **p; | |
935 | const int abbrev_name_len = strlen(abbrev_name); | |
936 | ||
937 | for (p = rules; *p; p++) { | |
938 | if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { | |
939 | return 1; | |
940 | } | |
941 | } | |
942 | ||
943 | return 0; | |
944 | } | |
945 | ||
e5f38ec3 | 946 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
947 | const unsigned char *old_sha1, int mustexist) |
948 | { | |
8da19775 | 949 | if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 950 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
951 | unlock_ref(lock); |
952 | return NULL; | |
953 | } | |
a89fccd2 | 954 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 955 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
956 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
957 | unlock_ref(lock); | |
958 | return NULL; | |
959 | } | |
960 | return lock; | |
961 | } | |
962 | ||
7155b727 | 963 | static int remove_empty_directories(const char *file) |
bc7127ef JH |
964 | { |
965 | /* we want to create a file but there is a directory there; | |
966 | * if that is an empty directory (or a directory that contains | |
967 | * only empty directories), remove them. | |
968 | */ | |
7155b727 JS |
969 | struct strbuf path; |
970 | int result; | |
bc7127ef | 971 | |
7155b727 JS |
972 | strbuf_init(&path, 20); |
973 | strbuf_addstr(&path, file); | |
974 | ||
a0f4afbe | 975 | result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY); |
7155b727 JS |
976 | |
977 | strbuf_release(&path); | |
978 | ||
979 | return result; | |
bc7127ef JH |
980 | } |
981 | ||
c976d415 LH |
982 | static int is_refname_available(const char *ref, const char *oldref, |
983 | struct ref_list *list, int quiet) | |
984 | { | |
985 | int namlen = strlen(ref); /* e.g. 'foo/bar' */ | |
986 | while (list) { | |
987 | /* list->name could be 'foo' or 'foo/bar/baz' */ | |
988 | if (!oldref || strcmp(oldref, list->name)) { | |
989 | int len = strlen(list->name); | |
990 | int cmplen = (namlen < len) ? namlen : len; | |
991 | const char *lead = (namlen < len) ? list->name : ref; | |
992 | if (!strncmp(ref, list->name, cmplen) && | |
993 | lead[cmplen] == '/') { | |
994 | if (!quiet) | |
995 | error("'%s' exists; cannot create '%s'", | |
996 | list->name, ref); | |
997 | return 0; | |
998 | } | |
999 | } | |
1000 | list = list->next; | |
1001 | } | |
1002 | return 1; | |
1003 | } | |
1004 | ||
68db31cc | 1005 | static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p) |
4bd18c43 | 1006 | { |
434cd0cd | 1007 | char *ref_file; |
ed378ec7 | 1008 | const char *orig_ref = ref; |
4bd18c43 | 1009 | struct ref_lock *lock; |
5cc3cef9 | 1010 | int last_errno = 0; |
acd3b9ec | 1011 | int type, lflags; |
4431fcc4 | 1012 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
5bdd8d4a | 1013 | int missing = 0; |
4bd18c43 SP |
1014 | |
1015 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
1016 | lock->lock_fd = -1; | |
1017 | ||
68db31cc | 1018 | ref = resolve_ref(ref, lock->old_sha1, mustexist, &type); |
bc7127ef JH |
1019 | if (!ref && errno == EISDIR) { |
1020 | /* we are trying to lock foo but we used to | |
1021 | * have foo/bar which now does not exist; | |
1022 | * it is normal for the empty directory 'foo' | |
1023 | * to remain. | |
1024 | */ | |
1025 | ref_file = git_path("%s", orig_ref); | |
5cc3cef9 JH |
1026 | if (remove_empty_directories(ref_file)) { |
1027 | last_errno = errno; | |
1028 | error("there are still refs under '%s'", orig_ref); | |
1029 | goto error_return; | |
1030 | } | |
68db31cc | 1031 | ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type); |
bc7127ef | 1032 | } |
68db31cc SV |
1033 | if (type_p) |
1034 | *type_p = type; | |
ed378ec7 | 1035 | if (!ref) { |
5cc3cef9 | 1036 | last_errno = errno; |
818f477c | 1037 | error("unable to resolve reference %s: %s", |
ed378ec7 | 1038 | orig_ref, strerror(errno)); |
5cc3cef9 | 1039 | goto error_return; |
4bd18c43 | 1040 | } |
5bdd8d4a | 1041 | missing = is_null_sha1(lock->old_sha1); |
c976d415 LH |
1042 | /* When the ref did not exist and we are creating it, |
1043 | * make sure there is no existing ref that is packed | |
1044 | * whose name begins with our refname, nor a ref whose | |
1045 | * name is a proper prefix of our refname. | |
1046 | */ | |
5bdd8d4a | 1047 | if (missing && |
0bad611b | 1048 | !is_refname_available(ref, NULL, get_packed_refs(NULL), 0)) { |
f475e08e | 1049 | last_errno = ENOTDIR; |
c976d415 | 1050 | goto error_return; |
f475e08e | 1051 | } |
22a3844e | 1052 | |
c33d5174 | 1053 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 1054 | |
acd3b9ec JH |
1055 | lflags = LOCK_DIE_ON_ERROR; |
1056 | if (flags & REF_NODEREF) { | |
68db31cc | 1057 | ref = orig_ref; |
acd3b9ec JH |
1058 | lflags |= LOCK_NODEREF; |
1059 | } | |
434cd0cd | 1060 | lock->ref_name = xstrdup(ref); |
1655707c | 1061 | lock->orig_ref_name = xstrdup(orig_ref); |
7c1a278d | 1062 | ref_file = git_path("%s", ref); |
5bdd8d4a | 1063 | if (missing) |
68db31cc SV |
1064 | lock->force_write = 1; |
1065 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
1066 | lock->force_write = 1; | |
4bd18c43 | 1067 | |
5cc3cef9 JH |
1068 | if (safe_create_leading_directories(ref_file)) { |
1069 | last_errno = errno; | |
1070 | error("unable to create directory for %s", ref_file); | |
1071 | goto error_return; | |
1072 | } | |
4bd18c43 | 1073 | |
acd3b9ec | 1074 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags); |
4bd18c43 | 1075 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; |
5cc3cef9 JH |
1076 | |
1077 | error_return: | |
1078 | unlock_ref(lock); | |
1079 | errno = last_errno; | |
1080 | return NULL; | |
4bd18c43 SP |
1081 | } |
1082 | ||
4431fcc4 | 1083 | struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1) |
95fc7512 | 1084 | { |
53cce84c | 1085 | char refpath[PATH_MAX]; |
95fc7512 | 1086 | if (check_ref_format(ref)) |
4bd18c43 | 1087 | return NULL; |
53cce84c | 1088 | strcpy(refpath, mkpath("refs/%s", ref)); |
68db31cc | 1089 | return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL); |
4bd18c43 SP |
1090 | } |
1091 | ||
68db31cc | 1092 | struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags) |
4bd18c43 | 1093 | { |
5f7b202a | 1094 | switch (check_ref_format(ref)) { |
5f7b202a | 1095 | default: |
257f3020 JH |
1096 | return NULL; |
1097 | case 0: | |
1098 | case CHECK_REF_FORMAT_ONELEVEL: | |
5f7b202a JH |
1099 | return lock_ref_sha1_basic(ref, old_sha1, flags, NULL); |
1100 | } | |
c0277d15 JH |
1101 | } |
1102 | ||
26a063a1 JH |
1103 | static struct lock_file packlock; |
1104 | ||
c0277d15 JH |
1105 | static int repack_without_ref(const char *refname) |
1106 | { | |
1107 | struct ref_list *list, *packed_ref_list; | |
1108 | int fd; | |
1109 | int found = 0; | |
c0277d15 | 1110 | |
0bad611b | 1111 | packed_ref_list = get_packed_refs(NULL); |
c0277d15 JH |
1112 | for (list = packed_ref_list; list; list = list->next) { |
1113 | if (!strcmp(refname, list->name)) { | |
1114 | found = 1; | |
1115 | break; | |
1116 | } | |
1117 | } | |
1118 | if (!found) | |
1119 | return 0; | |
c0277d15 | 1120 | fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0); |
1b018fd9 MV |
1121 | if (fd < 0) { |
1122 | unable_to_lock_error(git_path("packed-refs"), errno); | |
c0277d15 | 1123 | return error("cannot delete '%s' from packed refs", refname); |
1b018fd9 | 1124 | } |
c0277d15 JH |
1125 | |
1126 | for (list = packed_ref_list; list; list = list->next) { | |
1127 | char line[PATH_MAX + 100]; | |
1128 | int len; | |
1129 | ||
1130 | if (!strcmp(refname, list->name)) | |
1131 | continue; | |
1132 | len = snprintf(line, sizeof(line), "%s %s\n", | |
1133 | sha1_to_hex(list->sha1), list->name); | |
1134 | /* this should not happen but just being defensive */ | |
1135 | if (len > sizeof(line)) | |
1136 | die("too long a refname '%s'", list->name); | |
1137 | write_or_die(fd, line, len); | |
1138 | } | |
1139 | return commit_lock_file(&packlock); | |
1140 | } | |
1141 | ||
eca35a25 | 1142 | int delete_ref(const char *refname, const unsigned char *sha1, int delopt) |
c0277d15 JH |
1143 | { |
1144 | struct ref_lock *lock; | |
eca35a25 | 1145 | int err, i = 0, ret = 0, flag = 0; |
c0277d15 | 1146 | |
68db31cc | 1147 | lock = lock_ref_sha1_basic(refname, sha1, 0, &flag); |
c0277d15 JH |
1148 | if (!lock) |
1149 | return 1; | |
045a476f | 1150 | if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) { |
c0277d15 | 1151 | /* loose */ |
eca35a25 MV |
1152 | const char *path; |
1153 | ||
1154 | if (!(delopt & REF_NODEREF)) { | |
1155 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
1156 | lock->lk->filename[i] = 0; | |
1157 | path = lock->lk->filename; | |
1158 | } else { | |
9db56f71 | 1159 | path = git_path("%s", refname); |
eca35a25 | 1160 | } |
691f1a28 AR |
1161 | err = unlink_or_warn(path); |
1162 | if (err && errno != ENOENT) | |
c0277d15 | 1163 | ret = 1; |
691f1a28 | 1164 | |
eca35a25 MV |
1165 | if (!(delopt & REF_NODEREF)) |
1166 | lock->lk->filename[i] = '.'; | |
c0277d15 JH |
1167 | } |
1168 | /* removing the loose one could have resurrected an earlier | |
1169 | * packed one. Also, if it was not loose we need to repack | |
1170 | * without it. | |
1171 | */ | |
1172 | ret |= repack_without_ref(refname); | |
1173 | ||
691f1a28 | 1174 | unlink_or_warn(git_path("logs/%s", lock->ref_name)); |
c0277d15 JH |
1175 | invalidate_cached_refs(); |
1176 | unlock_ref(lock); | |
1177 | return ret; | |
4bd18c43 SP |
1178 | } |
1179 | ||
765c2258 PH |
1180 | /* |
1181 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
1182 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
1183 | * | |
1184 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
1185 | * live into logs/refs. | |
1186 | */ | |
1187 | #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log" | |
1188 | ||
678d0f4c | 1189 | int rename_ref(const char *oldref, const char *newref, const char *logmsg) |
c976d415 LH |
1190 | { |
1191 | static const char renamed_ref[] = "RENAMED-REF"; | |
1192 | unsigned char sha1[20], orig_sha1[20]; | |
1193 | int flag = 0, logmoved = 0; | |
1194 | struct ref_lock *lock; | |
c976d415 | 1195 | struct stat loginfo; |
16c2bfbb | 1196 | int log = !lstat(git_path("logs/%s", oldref), &loginfo); |
eca35a25 | 1197 | const char *symref = NULL; |
c976d415 | 1198 | |
450d4c0f | 1199 | if (log && S_ISLNK(loginfo.st_mode)) |
c976d415 LH |
1200 | return error("reflog for %s is a symlink", oldref); |
1201 | ||
eca35a25 MV |
1202 | symref = resolve_ref(oldref, orig_sha1, 1, &flag); |
1203 | if (flag & REF_ISSYMREF) | |
fa58186c MV |
1204 | return error("refname %s is a symbolic ref, renaming it is not supported", |
1205 | oldref); | |
eca35a25 | 1206 | if (!symref) |
c976d415 LH |
1207 | return error("refname %s not found", oldref); |
1208 | ||
0bad611b | 1209 | if (!is_refname_available(newref, oldref, get_packed_refs(NULL), 0)) |
c976d415 LH |
1210 | return 1; |
1211 | ||
0bad611b | 1212 | if (!is_refname_available(newref, oldref, get_loose_refs(NULL), 0)) |
c976d415 LH |
1213 | return 1; |
1214 | ||
68db31cc | 1215 | lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL); |
c976d415 LH |
1216 | if (!lock) |
1217 | return error("unable to lock %s", renamed_ref); | |
1218 | lock->force_write = 1; | |
678d0f4c | 1219 | if (write_ref_sha1(lock, orig_sha1, logmsg)) |
c976d415 LH |
1220 | return error("unable to save current sha1 in %s", renamed_ref); |
1221 | ||
765c2258 PH |
1222 | if (log && rename(git_path("logs/%s", oldref), git_path(TMP_RENAMED_LOG))) |
1223 | return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s", | |
c976d415 LH |
1224 | oldref, strerror(errno)); |
1225 | ||
eca35a25 | 1226 | if (delete_ref(oldref, orig_sha1, REF_NODEREF)) { |
c976d415 LH |
1227 | error("unable to delete old %s", oldref); |
1228 | goto rollback; | |
1229 | } | |
1230 | ||
eca35a25 | 1231 | if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1, REF_NODEREF)) { |
c976d415 LH |
1232 | if (errno==EISDIR) { |
1233 | if (remove_empty_directories(git_path("%s", newref))) { | |
1234 | error("Directory not empty: %s", newref); | |
1235 | goto rollback; | |
1236 | } | |
1237 | } else { | |
1238 | error("unable to delete existing %s", newref); | |
1239 | goto rollback; | |
1240 | } | |
1241 | } | |
1242 | ||
1243 | if (log && safe_create_leading_directories(git_path("logs/%s", newref))) { | |
1244 | error("unable to create directory for %s", newref); | |
1245 | goto rollback; | |
1246 | } | |
1247 | ||
1248 | retry: | |
765c2258 | 1249 | if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newref))) { |
d9e74d57 JR |
1250 | if (errno==EISDIR || errno==ENOTDIR) { |
1251 | /* | |
1252 | * rename(a, b) when b is an existing | |
1253 | * directory ought to result in ISDIR, but | |
1254 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
1255 | */ | |
c976d415 LH |
1256 | if (remove_empty_directories(git_path("logs/%s", newref))) { |
1257 | error("Directory not empty: logs/%s", newref); | |
1258 | goto rollback; | |
1259 | } | |
1260 | goto retry; | |
1261 | } else { | |
765c2258 | 1262 | error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s", |
c976d415 LH |
1263 | newref, strerror(errno)); |
1264 | goto rollback; | |
1265 | } | |
1266 | } | |
1267 | logmoved = log; | |
1268 | ||
68db31cc | 1269 | lock = lock_ref_sha1_basic(newref, NULL, 0, NULL); |
c976d415 LH |
1270 | if (!lock) { |
1271 | error("unable to lock %s for update", newref); | |
1272 | goto rollback; | |
1273 | } | |
c976d415 LH |
1274 | lock->force_write = 1; |
1275 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 1276 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
c976d415 LH |
1277 | error("unable to write current sha1 into %s", newref); |
1278 | goto rollback; | |
1279 | } | |
1280 | ||
1281 | return 0; | |
1282 | ||
1283 | rollback: | |
68db31cc | 1284 | lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL); |
c976d415 LH |
1285 | if (!lock) { |
1286 | error("unable to lock %s for rollback", oldref); | |
1287 | goto rollbacklog; | |
1288 | } | |
1289 | ||
1290 | lock->force_write = 1; | |
1291 | flag = log_all_ref_updates; | |
1292 | log_all_ref_updates = 0; | |
1293 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
1294 | error("unable to write current sha1 into %s", oldref); | |
1295 | log_all_ref_updates = flag; | |
1296 | ||
1297 | rollbacklog: | |
1298 | if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref))) | |
1299 | error("unable to restore logfile %s from %s: %s", | |
1300 | oldref, newref, strerror(errno)); | |
1301 | if (!logmoved && log && | |
765c2258 PH |
1302 | rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldref))) |
1303 | error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s", | |
c976d415 LH |
1304 | oldref, strerror(errno)); |
1305 | ||
1306 | return 1; | |
1307 | } | |
1308 | ||
435fc852 | 1309 | int close_ref(struct ref_lock *lock) |
b531394d BC |
1310 | { |
1311 | if (close_lock_file(lock->lk)) | |
1312 | return -1; | |
1313 | lock->lock_fd = -1; | |
1314 | return 0; | |
1315 | } | |
1316 | ||
435fc852 | 1317 | int commit_ref(struct ref_lock *lock) |
b531394d BC |
1318 | { |
1319 | if (commit_lock_file(lock->lk)) | |
1320 | return -1; | |
1321 | lock->lock_fd = -1; | |
1322 | return 0; | |
1323 | } | |
1324 | ||
e5f38ec3 | 1325 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 | 1326 | { |
4ed7cd3a BC |
1327 | /* Do not free lock->lk -- atexit() still looks at them */ |
1328 | if (lock->lk) | |
1329 | rollback_lock_file(lock->lk); | |
434cd0cd | 1330 | free(lock->ref_name); |
1655707c | 1331 | free(lock->orig_ref_name); |
4bd18c43 SP |
1332 | free(lock); |
1333 | } | |
1334 | ||
0ec29a47 JH |
1335 | /* |
1336 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
1337 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
1338 | * because reflog file is one line per entry. | |
1339 | */ | |
1340 | static int copy_msg(char *buf, const char *msg) | |
1341 | { | |
1342 | char *cp = buf; | |
1343 | char c; | |
1344 | int wasspace = 1; | |
1345 | ||
1346 | *cp++ = '\t'; | |
1347 | while ((c = *msg++)) { | |
1348 | if (wasspace && isspace(c)) | |
1349 | continue; | |
1350 | wasspace = isspace(c); | |
1351 | if (wasspace) | |
1352 | c = ' '; | |
1353 | *cp++ = c; | |
1354 | } | |
1355 | while (buf < cp && isspace(cp[-1])) | |
1356 | cp--; | |
1357 | *cp++ = '\n'; | |
1358 | return cp - buf; | |
1359 | } | |
1360 | ||
157aaea5 | 1361 | int log_ref_setup(const char *ref_name, char *logfile, int bufsize) |
6de08ae6 | 1362 | { |
859c3017 | 1363 | int logfd, oflags = O_APPEND | O_WRONLY; |
9a13f0b7 | 1364 | |
157aaea5 | 1365 | git_snpath(logfile, bufsize, "logs/%s", ref_name); |
4057deb5 | 1366 | if (log_all_ref_updates && |
cc44c765 JH |
1367 | (!prefixcmp(ref_name, "refs/heads/") || |
1368 | !prefixcmp(ref_name, "refs/remotes/") || | |
b2e256b0 | 1369 | !prefixcmp(ref_name, "refs/notes/") || |
bd104db1 | 1370 | !strcmp(ref_name, "HEAD"))) { |
157aaea5 | 1371 | if (safe_create_leading_directories(logfile) < 0) |
6de08ae6 | 1372 | return error("unable to create directory for %s", |
157aaea5 | 1373 | logfile); |
6de08ae6 SP |
1374 | oflags |= O_CREAT; |
1375 | } | |
1376 | ||
157aaea5 | 1377 | logfd = open(logfile, oflags, 0666); |
6de08ae6 | 1378 | if (logfd < 0) { |
1974bf62 | 1379 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 1380 | return 0; |
3b463c3f JH |
1381 | |
1382 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
157aaea5 | 1383 | if (remove_empty_directories(logfile)) { |
3b463c3f | 1384 | return error("There are still logs under '%s'", |
157aaea5 | 1385 | logfile); |
3b463c3f | 1386 | } |
157aaea5 | 1387 | logfd = open(logfile, oflags, 0666); |
3b463c3f JH |
1388 | } |
1389 | ||
1390 | if (logfd < 0) | |
1391 | return error("Unable to append to %s: %s", | |
157aaea5 | 1392 | logfile, strerror(errno)); |
6de08ae6 SP |
1393 | } |
1394 | ||
157aaea5 | 1395 | adjust_shared_perm(logfile); |
859c3017 EM |
1396 | close(logfd); |
1397 | return 0; | |
1398 | } | |
443b92b6 | 1399 | |
859c3017 EM |
1400 | static int log_ref_write(const char *ref_name, const unsigned char *old_sha1, |
1401 | const unsigned char *new_sha1, const char *msg) | |
1402 | { | |
1403 | int logfd, result, written, oflags = O_APPEND | O_WRONLY; | |
1404 | unsigned maxlen, len; | |
1405 | int msglen; | |
157aaea5 | 1406 | char log_file[PATH_MAX]; |
859c3017 EM |
1407 | char *logrec; |
1408 | const char *committer; | |
1409 | ||
1410 | if (log_all_ref_updates < 0) | |
1411 | log_all_ref_updates = !is_bare_repository(); | |
1412 | ||
157aaea5 | 1413 | result = log_ref_setup(ref_name, log_file, sizeof(log_file)); |
859c3017 EM |
1414 | if (result) |
1415 | return result; | |
1416 | ||
1417 | logfd = open(log_file, oflags); | |
1418 | if (logfd < 0) | |
1419 | return 0; | |
0ec29a47 | 1420 | msglen = msg ? strlen(msg) : 0; |
774751a8 | 1421 | committer = git_committer_info(0); |
8ac65937 JH |
1422 | maxlen = strlen(committer) + msglen + 100; |
1423 | logrec = xmalloc(maxlen); | |
1424 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
1425 | sha1_to_hex(old_sha1), |
1426 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
1427 | committer); |
1428 | if (msglen) | |
0ec29a47 | 1429 | len += copy_msg(logrec + len - 1, msg) - 1; |
93822c22 | 1430 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 | 1431 | free(logrec); |
91c8d590 | 1432 | if (close(logfd) != 0 || written != len) |
9a13f0b7 | 1433 | return error("Unable to append to %s", log_file); |
6de08ae6 SP |
1434 | return 0; |
1435 | } | |
1436 | ||
c3b0dec5 LT |
1437 | static int is_branch(const char *refname) |
1438 | { | |
1439 | return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/"); | |
1440 | } | |
1441 | ||
4bd18c43 SP |
1442 | int write_ref_sha1(struct ref_lock *lock, |
1443 | const unsigned char *sha1, const char *logmsg) | |
1444 | { | |
1445 | static char term = '\n'; | |
c3b0dec5 | 1446 | struct object *o; |
4bd18c43 SP |
1447 | |
1448 | if (!lock) | |
95fc7512 | 1449 | return -1; |
a89fccd2 | 1450 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
1451 | unlock_ref(lock); |
1452 | return 0; | |
95fc7512 | 1453 | } |
c3b0dec5 LT |
1454 | o = parse_object(sha1); |
1455 | if (!o) { | |
1456 | error("Trying to write ref %s with nonexistant object %s", | |
1457 | lock->ref_name, sha1_to_hex(sha1)); | |
1458 | unlock_ref(lock); | |
1459 | return -1; | |
1460 | } | |
1461 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1462 | error("Trying to write non-commit object %s to branch %s", | |
1463 | sha1_to_hex(sha1), lock->ref_name); | |
1464 | unlock_ref(lock); | |
1465 | return -1; | |
1466 | } | |
93822c22 AW |
1467 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
1468 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
b531394d | 1469 | || close_ref(lock) < 0) { |
c33d5174 | 1470 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
1471 | unlock_ref(lock); |
1472 | return -1; | |
1473 | } | |
5e290ff7 | 1474 | invalidate_cached_refs(); |
bd104db1 NP |
1475 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
1476 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
1477 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
1478 | unlock_ref(lock); |
1479 | return -1; | |
1480 | } | |
605fac8b NP |
1481 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
1482 | /* | |
1483 | * Special hack: If a branch is updated directly and HEAD | |
1484 | * points to it (may happen on the remote side of a push | |
1485 | * for example) then logically the HEAD reflog should be | |
1486 | * updated too. | |
1487 | * A generic solution implies reverse symref information, | |
1488 | * but finding all symrefs pointing to the given branch | |
1489 | * would be rather costly for this rare event (the direct | |
1490 | * update of a branch) to be worth it. So let's cheat and | |
1491 | * check with HEAD only which should cover 99% of all usage | |
1492 | * scenarios (even 100% of the default ones). | |
1493 | */ | |
1494 | unsigned char head_sha1[20]; | |
1495 | int head_flag; | |
1496 | const char *head_ref; | |
1497 | head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag); | |
1498 | if (head_ref && (head_flag & REF_ISSYMREF) && | |
1499 | !strcmp(head_ref, lock->ref_name)) | |
1500 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
1501 | } | |
b531394d | 1502 | if (commit_ref(lock)) { |
434cd0cd | 1503 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
1504 | unlock_ref(lock); |
1505 | return -1; | |
1506 | } | |
4bd18c43 SP |
1507 | unlock_ref(lock); |
1508 | return 0; | |
95fc7512 | 1509 | } |
d556fae2 | 1510 | |
8b5157e4 NP |
1511 | int create_symref(const char *ref_target, const char *refs_heads_master, |
1512 | const char *logmsg) | |
41b625b0 NP |
1513 | { |
1514 | const char *lockpath; | |
1515 | char ref[1000]; | |
1516 | int fd, len, written; | |
a4f34cbb | 1517 | char *git_HEAD = git_pathdup("%s", ref_target); |
8b5157e4 NP |
1518 | unsigned char old_sha1[20], new_sha1[20]; |
1519 | ||
1520 | if (logmsg && read_ref(ref_target, old_sha1)) | |
1521 | hashclr(old_sha1); | |
41b625b0 | 1522 | |
d48744d1 JH |
1523 | if (safe_create_leading_directories(git_HEAD) < 0) |
1524 | return error("unable to create directory for %s", git_HEAD); | |
1525 | ||
41b625b0 NP |
1526 | #ifndef NO_SYMLINK_HEAD |
1527 | if (prefer_symlink_refs) { | |
1528 | unlink(git_HEAD); | |
1529 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 1530 | goto done; |
41b625b0 NP |
1531 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
1532 | } | |
1533 | #endif | |
1534 | ||
1535 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
1536 | if (sizeof(ref) <= len) { | |
1537 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 1538 | goto error_free_return; |
41b625b0 NP |
1539 | } |
1540 | lockpath = mkpath("%s.lock", git_HEAD); | |
1541 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
1542 | if (fd < 0) { | |
1543 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 1544 | goto error_free_return; |
41b625b0 NP |
1545 | } |
1546 | written = write_in_full(fd, ref, len); | |
91c8d590 | 1547 | if (close(fd) != 0 || written != len) { |
41b625b0 | 1548 | error("Unable to write to %s", lockpath); |
47fc52e2 | 1549 | goto error_unlink_return; |
41b625b0 NP |
1550 | } |
1551 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 1552 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 1553 | goto error_unlink_return; |
41b625b0 NP |
1554 | } |
1555 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 1556 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 | 1557 | error_unlink_return: |
691f1a28 | 1558 | unlink_or_warn(lockpath); |
47fc52e2 JH |
1559 | error_free_return: |
1560 | free(git_HEAD); | |
1561 | return -1; | |
41b625b0 | 1562 | } |
8b5157e4 | 1563 | |
ee96d11b | 1564 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 1565 | done: |
ee96d11b | 1566 | #endif |
8b5157e4 NP |
1567 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
1568 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
1569 | ||
47fc52e2 | 1570 | free(git_HEAD); |
41b625b0 NP |
1571 | return 0; |
1572 | } | |
1573 | ||
16d7cc90 JH |
1574 | static char *ref_msg(const char *line, const char *endp) |
1575 | { | |
1576 | const char *ep; | |
16d7cc90 | 1577 | line += 82; |
182af834 PH |
1578 | ep = memchr(line, '\n', endp - line); |
1579 | if (!ep) | |
1580 | ep = endp; | |
1581 | return xmemdupz(line, ep - line); | |
16d7cc90 JH |
1582 | } |
1583 | ||
1584 | 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 | 1585 | { |
e5229042 | 1586 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 | 1587 | char *tz_c; |
e29cb53a | 1588 | int logfd, tz, reccnt = 0; |
d556fae2 SP |
1589 | struct stat st; |
1590 | unsigned long date; | |
e5229042 | 1591 | unsigned char logged_sha1[20]; |
cb48cb58 | 1592 | void *log_mapped; |
dc49cd76 | 1593 | size_t mapsz; |
d556fae2 SP |
1594 | |
1595 | logfile = git_path("logs/%s", ref); | |
1596 | logfd = open(logfile, O_RDONLY, 0); | |
1597 | if (logfd < 0) | |
d824cbba | 1598 | die_errno("Unable to read log '%s'", logfile); |
d556fae2 SP |
1599 | fstat(logfd, &st); |
1600 | if (!st.st_size) | |
1601 | die("Log %s is empty.", logfile); | |
dc49cd76 SP |
1602 | mapsz = xsize_t(st.st_size); |
1603 | log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0); | |
cb48cb58 | 1604 | logdata = log_mapped; |
d556fae2 SP |
1605 | close(logfd); |
1606 | ||
e5229042 | 1607 | lastrec = NULL; |
d556fae2 SP |
1608 | rec = logend = logdata + st.st_size; |
1609 | while (logdata < rec) { | |
e29cb53a | 1610 | reccnt++; |
d556fae2 SP |
1611 | if (logdata < rec && *(rec-1) == '\n') |
1612 | rec--; | |
e5229042 SP |
1613 | lastgt = NULL; |
1614 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 1615 | rec--; |
e5229042 SP |
1616 | if (*rec == '>') |
1617 | lastgt = rec; | |
1618 | } | |
1619 | if (!lastgt) | |
d556fae2 | 1620 | die("Log %s is corrupt.", logfile); |
e5229042 | 1621 | date = strtoul(lastgt + 1, &tz_c, 10); |
ab2a1a32 | 1622 | if (date <= at_time || cnt == 0) { |
76a44c5c | 1623 | tz = strtoul(tz_c, NULL, 10); |
16d7cc90 JH |
1624 | if (msg) |
1625 | *msg = ref_msg(rec, logend); | |
1626 | if (cutoff_time) | |
1627 | *cutoff_time = date; | |
1628 | if (cutoff_tz) | |
1629 | *cutoff_tz = tz; | |
1630 | if (cutoff_cnt) | |
76a44c5c | 1631 | *cutoff_cnt = reccnt - 1; |
e5229042 SP |
1632 | if (lastrec) { |
1633 | if (get_sha1_hex(lastrec, logged_sha1)) | |
1634 | die("Log %s is corrupt.", logfile); | |
1635 | if (get_sha1_hex(rec + 41, sha1)) | |
1636 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1637 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1638 | warning("Log %s has gap after %s.", |
73013afd | 1639 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 | 1640 | } |
e5f38ec3 JH |
1641 | } |
1642 | else if (date == at_time) { | |
e5229042 SP |
1643 | if (get_sha1_hex(rec + 41, sha1)) |
1644 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
1645 | } |
1646 | else { | |
e5229042 SP |
1647 | if (get_sha1_hex(rec + 41, logged_sha1)) |
1648 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1649 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1650 | warning("Log %s unexpectedly ended on %s.", |
73013afd | 1651 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 SP |
1652 | } |
1653 | } | |
dc49cd76 | 1654 | munmap(log_mapped, mapsz); |
d556fae2 SP |
1655 | return 0; |
1656 | } | |
e5229042 | 1657 | lastrec = rec; |
ab2a1a32 JH |
1658 | if (cnt > 0) |
1659 | cnt--; | |
d556fae2 SP |
1660 | } |
1661 | ||
e5229042 SP |
1662 | rec = logdata; |
1663 | while (rec < logend && *rec != '>' && *rec != '\n') | |
1664 | rec++; | |
1665 | if (rec == logend || *rec == '\n') | |
d556fae2 | 1666 | die("Log %s is corrupt.", logfile); |
e5229042 | 1667 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
1668 | tz = strtoul(tz_c, NULL, 10); |
1669 | if (get_sha1_hex(logdata, sha1)) | |
1670 | die("Log %s is corrupt.", logfile); | |
d1a4489a JK |
1671 | if (is_null_sha1(sha1)) { |
1672 | if (get_sha1_hex(logdata + 41, sha1)) | |
1673 | die("Log %s is corrupt.", logfile); | |
1674 | } | |
16d7cc90 JH |
1675 | if (msg) |
1676 | *msg = ref_msg(logdata, logend); | |
dc49cd76 | 1677 | munmap(log_mapped, mapsz); |
16d7cc90 JH |
1678 | |
1679 | if (cutoff_time) | |
1680 | *cutoff_time = date; | |
1681 | if (cutoff_tz) | |
1682 | *cutoff_tz = tz; | |
1683 | if (cutoff_cnt) | |
1684 | *cutoff_cnt = reccnt; | |
1685 | return 1; | |
d556fae2 | 1686 | } |
2ff81662 | 1687 | |
101d15e0 | 1688 | int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long ofs, void *cb_data) |
2ff81662 JH |
1689 | { |
1690 | const char *logfile; | |
1691 | FILE *logfp; | |
8ca78803 | 1692 | struct strbuf sb = STRBUF_INIT; |
2266bf27 | 1693 | int ret = 0; |
2ff81662 JH |
1694 | |
1695 | logfile = git_path("logs/%s", ref); | |
1696 | logfp = fopen(logfile, "r"); | |
1697 | if (!logfp) | |
883d60fa | 1698 | return -1; |
101d15e0 JH |
1699 | |
1700 | if (ofs) { | |
1701 | struct stat statbuf; | |
1702 | if (fstat(fileno(logfp), &statbuf) || | |
1703 | statbuf.st_size < ofs || | |
1704 | fseek(logfp, -ofs, SEEK_END) || | |
8ca78803 | 1705 | strbuf_getwholeline(&sb, logfp, '\n')) { |
9d33f7c2 | 1706 | fclose(logfp); |
8ca78803 | 1707 | strbuf_release(&sb); |
101d15e0 | 1708 | return -1; |
9d33f7c2 | 1709 | } |
101d15e0 JH |
1710 | } |
1711 | ||
8ca78803 | 1712 | while (!strbuf_getwholeline(&sb, logfp, '\n')) { |
2ff81662 | 1713 | unsigned char osha1[20], nsha1[20]; |
883d60fa JS |
1714 | char *email_end, *message; |
1715 | unsigned long timestamp; | |
8ca78803 | 1716 | int tz; |
2ff81662 JH |
1717 | |
1718 | /* old SP new SP name <email> SP time TAB msg LF */ | |
8ca78803 RS |
1719 | if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' || |
1720 | get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' || | |
1721 | get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' || | |
1722 | !(email_end = strchr(sb.buf + 82, '>')) || | |
883d60fa JS |
1723 | email_end[1] != ' ' || |
1724 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
1725 | !message || message[0] != ' ' || | |
1726 | (message[1] != '+' && message[1] != '-') || | |
1727 | !isdigit(message[2]) || !isdigit(message[3]) || | |
b4dd4856 | 1728 | !isdigit(message[4]) || !isdigit(message[5])) |
2ff81662 | 1729 | continue; /* corrupt? */ |
883d60fa JS |
1730 | email_end[1] = '\0'; |
1731 | tz = strtol(message + 1, NULL, 10); | |
b4dd4856 JS |
1732 | if (message[6] != '\t') |
1733 | message += 6; | |
1734 | else | |
1735 | message += 7; | |
8ca78803 RS |
1736 | ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message, |
1737 | cb_data); | |
883d60fa | 1738 | if (ret) |
2266bf27 | 1739 | break; |
2ff81662 JH |
1740 | } |
1741 | fclose(logfp); | |
8ca78803 | 1742 | strbuf_release(&sb); |
2266bf27 | 1743 | return ret; |
2ff81662 | 1744 | } |
e29cb53a | 1745 | |
101d15e0 JH |
1746 | int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data) |
1747 | { | |
1748 | return for_each_recent_reflog_ent(ref, fn, 0, cb_data); | |
1749 | } | |
1750 | ||
eb8381c8 NP |
1751 | static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data) |
1752 | { | |
1753 | DIR *dir = opendir(git_path("logs/%s", base)); | |
fcee5a14 | 1754 | int retval = 0; |
eb8381c8 NP |
1755 | |
1756 | if (dir) { | |
1757 | struct dirent *de; | |
1758 | int baselen = strlen(base); | |
1759 | char *log = xmalloc(baselen + 257); | |
1760 | ||
1761 | memcpy(log, base, baselen); | |
1762 | if (baselen && base[baselen-1] != '/') | |
1763 | log[baselen++] = '/'; | |
1764 | ||
1765 | while ((de = readdir(dir)) != NULL) { | |
1766 | struct stat st; | |
1767 | int namelen; | |
1768 | ||
1769 | if (de->d_name[0] == '.') | |
1770 | continue; | |
1771 | namelen = strlen(de->d_name); | |
1772 | if (namelen > 255) | |
1773 | continue; | |
1774 | if (has_extension(de->d_name, ".lock")) | |
1775 | continue; | |
1776 | memcpy(log + baselen, de->d_name, namelen+1); | |
1777 | if (stat(git_path("logs/%s", log), &st) < 0) | |
1778 | continue; | |
1779 | if (S_ISDIR(st.st_mode)) { | |
1780 | retval = do_for_each_reflog(log, fn, cb_data); | |
1781 | } else { | |
1782 | unsigned char sha1[20]; | |
1783 | if (!resolve_ref(log, sha1, 0, NULL)) | |
1784 | retval = error("bad ref for %s", log); | |
1785 | else | |
1786 | retval = fn(log, sha1, 0, cb_data); | |
1787 | } | |
1788 | if (retval) | |
1789 | break; | |
1790 | } | |
1791 | free(log); | |
1792 | closedir(dir); | |
1793 | } | |
acb39f64 | 1794 | else if (*base) |
fcee5a14 | 1795 | return errno; |
eb8381c8 NP |
1796 | return retval; |
1797 | } | |
1798 | ||
1799 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
1800 | { | |
1801 | return do_for_each_reflog("", fn, cb_data); | |
1802 | } | |
3d9f037c CR |
1803 | |
1804 | int update_ref(const char *action, const char *refname, | |
1805 | const unsigned char *sha1, const unsigned char *oldval, | |
1806 | int flags, enum action_on_err onerr) | |
1807 | { | |
1808 | static struct ref_lock *lock; | |
1809 | lock = lock_any_ref_for_update(refname, oldval, flags); | |
1810 | if (!lock) { | |
1811 | const char *str = "Cannot lock the ref '%s'."; | |
1812 | switch (onerr) { | |
1813 | case MSG_ON_ERR: error(str, refname); break; | |
1814 | case DIE_ON_ERR: die(str, refname); break; | |
1815 | case QUIET_ON_ERR: break; | |
1816 | } | |
1817 | return 1; | |
1818 | } | |
1819 | if (write_ref_sha1(lock, sha1, action) < 0) { | |
1820 | const char *str = "Cannot update the ref '%s'."; | |
1821 | switch (onerr) { | |
1822 | case MSG_ON_ERR: error(str, refname); break; | |
1823 | case DIE_ON_ERR: die(str, refname); break; | |
1824 | case QUIET_ON_ERR: break; | |
1825 | } | |
1826 | return 1; | |
1827 | } | |
1828 | return 0; | |
1829 | } | |
cda69f48 | 1830 | |
5483f799 | 1831 | struct ref *find_ref_by_name(const struct ref *list, const char *name) |
cda69f48 JK |
1832 | { |
1833 | for ( ; list; list = list->next) | |
1834 | if (!strcmp(list->name, name)) | |
5483f799 | 1835 | return (struct ref *)list; |
cda69f48 JK |
1836 | return NULL; |
1837 | } | |
7c2b3029 JK |
1838 | |
1839 | /* | |
1840 | * generate a format suitable for scanf from a ref_rev_parse_rules | |
1841 | * rule, that is replace the "%.*s" spec with a "%s" spec | |
1842 | */ | |
1843 | static void gen_scanf_fmt(char *scanf_fmt, const char *rule) | |
1844 | { | |
1845 | char *spec; | |
1846 | ||
1847 | spec = strstr(rule, "%.*s"); | |
1848 | if (!spec || strstr(spec + 4, "%.*s")) | |
1849 | die("invalid rule in ref_rev_parse_rules: %s", rule); | |
1850 | ||
1851 | /* copy all until spec */ | |
1852 | strncpy(scanf_fmt, rule, spec - rule); | |
1853 | scanf_fmt[spec - rule] = '\0'; | |
1854 | /* copy new spec */ | |
1855 | strcat(scanf_fmt, "%s"); | |
1856 | /* copy remaining rule */ | |
1857 | strcat(scanf_fmt, spec + 4); | |
1858 | ||
1859 | return; | |
1860 | } | |
1861 | ||
6e7b3309 | 1862 | char *shorten_unambiguous_ref(const char *ref, int strict) |
7c2b3029 JK |
1863 | { |
1864 | int i; | |
1865 | static char **scanf_fmts; | |
1866 | static int nr_rules; | |
1867 | char *short_name; | |
1868 | ||
1869 | /* pre generate scanf formats from ref_rev_parse_rules[] */ | |
1870 | if (!nr_rules) { | |
1871 | size_t total_len = 0; | |
1872 | ||
1873 | /* the rule list is NULL terminated, count them first */ | |
1874 | for (; ref_rev_parse_rules[nr_rules]; nr_rules++) | |
1875 | /* no +1 because strlen("%s") < strlen("%.*s") */ | |
1876 | total_len += strlen(ref_rev_parse_rules[nr_rules]); | |
1877 | ||
1878 | scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len); | |
1879 | ||
1880 | total_len = 0; | |
1881 | for (i = 0; i < nr_rules; i++) { | |
1882 | scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] | |
1883 | + total_len; | |
1884 | gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]); | |
1885 | total_len += strlen(ref_rev_parse_rules[i]); | |
1886 | } | |
1887 | } | |
1888 | ||
1889 | /* bail out if there are no rules */ | |
1890 | if (!nr_rules) | |
1891 | return xstrdup(ref); | |
1892 | ||
1893 | /* buffer for scanf result, at most ref must fit */ | |
1894 | short_name = xstrdup(ref); | |
1895 | ||
1896 | /* skip first rule, it will always match */ | |
1897 | for (i = nr_rules - 1; i > 0 ; --i) { | |
1898 | int j; | |
6e7b3309 | 1899 | int rules_to_fail = i; |
7c2b3029 JK |
1900 | int short_name_len; |
1901 | ||
1902 | if (1 != sscanf(ref, scanf_fmts[i], short_name)) | |
1903 | continue; | |
1904 | ||
1905 | short_name_len = strlen(short_name); | |
1906 | ||
6e7b3309 BW |
1907 | /* |
1908 | * in strict mode, all (except the matched one) rules | |
1909 | * must fail to resolve to a valid non-ambiguous ref | |
1910 | */ | |
1911 | if (strict) | |
1912 | rules_to_fail = nr_rules; | |
1913 | ||
7c2b3029 JK |
1914 | /* |
1915 | * check if the short name resolves to a valid ref, | |
1916 | * but use only rules prior to the matched one | |
1917 | */ | |
6e7b3309 | 1918 | for (j = 0; j < rules_to_fail; j++) { |
7c2b3029 JK |
1919 | const char *rule = ref_rev_parse_rules[j]; |
1920 | unsigned char short_objectname[20]; | |
1921 | char refname[PATH_MAX]; | |
1922 | ||
6e7b3309 BW |
1923 | /* skip matched rule */ |
1924 | if (i == j) | |
1925 | continue; | |
1926 | ||
7c2b3029 JK |
1927 | /* |
1928 | * the short name is ambiguous, if it resolves | |
1929 | * (with this previous rule) to a valid ref | |
1930 | * read_ref() returns 0 on success | |
1931 | */ | |
1932 | mksnpath(refname, sizeof(refname), | |
1933 | rule, short_name_len, short_name); | |
1934 | if (!read_ref(refname, short_objectname)) | |
1935 | break; | |
1936 | } | |
1937 | ||
1938 | /* | |
1939 | * short name is non-ambiguous if all previous rules | |
1940 | * haven't resolved to a valid ref | |
1941 | */ | |
6e7b3309 | 1942 | if (j == rules_to_fail) |
7c2b3029 JK |
1943 | return short_name; |
1944 | } | |
1945 | ||
1946 | free(short_name); | |
1947 | return xstrdup(ref); | |
1948 | } |