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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; | |
e5dbf605 | 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 | ||
f130b116 | 174 | static void clear_cached_refs(struct cached_refs *ca) |
e1e22e37 | 175 | { |
5e290ff7 JH |
176 | if (ca->did_loose && ca->loose) |
177 | free_ref_list(ca->loose); | |
178 | if (ca->did_packed && ca->packed) | |
179 | free_ref_list(ca->packed); | |
180 | ca->loose = ca->packed = NULL; | |
181 | ca->did_loose = ca->did_packed = 0; | |
f130b116 MH |
182 | } |
183 | ||
e5dbf605 MH |
184 | struct cached_refs *create_cached_refs(void) |
185 | { | |
186 | struct cached_refs *refs; | |
187 | refs = xmalloc(sizeof(struct cached_refs)); | |
188 | refs->did_loose = refs->did_packed = 0; | |
189 | refs->loose = refs->packed = NULL; | |
190 | return refs; | |
191 | } | |
192 | ||
4349a668 MH |
193 | /* |
194 | * Return a pointer to a cached_refs for the specified submodule. For | |
195 | * the main repository, use submodule==NULL. The returned structure | |
196 | * will be allocated and initialized but not necessarily populated; it | |
197 | * should not be freed. | |
198 | */ | |
199 | static struct cached_refs *get_cached_refs(const char *submodule) | |
200 | { | |
e5dbf605 MH |
201 | if (!submodule) { |
202 | if (!cached_refs) | |
203 | cached_refs = create_cached_refs(); | |
204 | return cached_refs; | |
205 | } else { | |
206 | if (!submodule_refs) | |
207 | submodule_refs = create_cached_refs(); | |
208 | else | |
209 | /* For now, don't reuse the refs cache for submodules. */ | |
210 | clear_cached_refs(submodule_refs); | |
211 | return submodule_refs; | |
4349a668 MH |
212 | } |
213 | } | |
214 | ||
f130b116 MH |
215 | static void invalidate_cached_refs(void) |
216 | { | |
4349a668 | 217 | clear_cached_refs(get_cached_refs(NULL)); |
5e290ff7 | 218 | } |
e1e22e37 | 219 | |
db4dd93a | 220 | static struct ref_list *read_packed_refs(FILE *f) |
f4204ab9 JH |
221 | { |
222 | struct ref_list *list = NULL; | |
223 | struct ref_list *last = NULL; | |
224 | char refline[PATH_MAX]; | |
225 | int flag = REF_ISPACKED; | |
226 | ||
227 | while (fgets(refline, sizeof(refline), f)) { | |
228 | unsigned char sha1[20]; | |
229 | const char *name; | |
230 | static const char header[] = "# pack-refs with:"; | |
231 | ||
232 | if (!strncmp(refline, header, sizeof(header)-1)) { | |
233 | const char *traits = refline + sizeof(header) - 1; | |
234 | if (strstr(traits, " peeled ")) | |
235 | flag |= REF_KNOWS_PEELED; | |
236 | /* perhaps other traits later as well */ | |
237 | continue; | |
238 | } | |
239 | ||
240 | name = parse_ref_line(refline, sha1); | |
241 | if (name) { | |
242 | list = add_ref(name, sha1, flag, list, &last); | |
243 | continue; | |
244 | } | |
245 | if (last && | |
246 | refline[0] == '^' && | |
247 | strlen(refline) == 42 && | |
248 | refline[41] == '\n' && | |
249 | !get_sha1_hex(refline + 1, sha1)) | |
250 | hashcpy(last->peeled, sha1); | |
251 | } | |
db4dd93a | 252 | return sort_ref_list(list); |
f4204ab9 JH |
253 | } |
254 | ||
e142a3c6 DB |
255 | void add_extra_ref(const char *name, const unsigned char *sha1, int flag) |
256 | { | |
257 | extra_refs = add_ref(name, sha1, flag, extra_refs, NULL); | |
258 | } | |
259 | ||
260 | void clear_extra_refs(void) | |
261 | { | |
262 | free_ref_list(extra_refs); | |
263 | extra_refs = NULL; | |
264 | } | |
265 | ||
0bad611b | 266 | static struct ref_list *get_packed_refs(const char *submodule) |
5e290ff7 | 267 | { |
4349a668 | 268 | struct cached_refs *refs = get_cached_refs(submodule); |
0bad611b | 269 | |
4349a668 MH |
270 | if (!refs->did_packed) { |
271 | const char *packed_refs_file; | |
272 | FILE *f; | |
273 | ||
274 | if (submodule) | |
275 | packed_refs_file = git_path_submodule(submodule, "packed-refs"); | |
276 | else | |
277 | packed_refs_file = git_path("packed-refs"); | |
278 | f = fopen(packed_refs_file, "r"); | |
0bad611b | 279 | refs->packed = NULL; |
e1e22e37 | 280 | if (f) { |
db4dd93a | 281 | refs->packed = read_packed_refs(f); |
e1e22e37 | 282 | fclose(f); |
e1e22e37 | 283 | } |
0bad611b | 284 | refs->did_packed = 1; |
e1e22e37 | 285 | } |
0bad611b | 286 | return refs->packed; |
e1e22e37 LT |
287 | } |
288 | ||
0bad611b HV |
289 | static struct ref_list *get_ref_dir(const char *submodule, const char *base, |
290 | struct ref_list *list) | |
e1e22e37 | 291 | { |
0bad611b HV |
292 | DIR *dir; |
293 | const char *path; | |
294 | ||
295 | if (submodule) | |
296 | path = git_path_submodule(submodule, "%s", base); | |
297 | else | |
298 | path = git_path("%s", base); | |
299 | ||
300 | ||
301 | dir = opendir(path); | |
e1e22e37 LT |
302 | |
303 | if (dir) { | |
304 | struct dirent *de; | |
305 | int baselen = strlen(base); | |
ed378ec7 | 306 | char *ref = xmalloc(baselen + 257); |
e1e22e37 | 307 | |
ed378ec7 | 308 | memcpy(ref, base, baselen); |
e1e22e37 | 309 | if (baselen && base[baselen-1] != '/') |
ed378ec7 | 310 | ref[baselen++] = '/'; |
e1e22e37 LT |
311 | |
312 | while ((de = readdir(dir)) != NULL) { | |
313 | unsigned char sha1[20]; | |
314 | struct stat st; | |
8da19775 | 315 | int flag; |
e1e22e37 | 316 | int namelen; |
0bad611b | 317 | const char *refdir; |
e1e22e37 LT |
318 | |
319 | if (de->d_name[0] == '.') | |
320 | continue; | |
321 | namelen = strlen(de->d_name); | |
322 | if (namelen > 255) | |
323 | continue; | |
324 | if (has_extension(de->d_name, ".lock")) | |
325 | continue; | |
ed378ec7 | 326 | memcpy(ref + baselen, de->d_name, namelen+1); |
0bad611b HV |
327 | refdir = submodule |
328 | ? git_path_submodule(submodule, "%s", ref) | |
329 | : git_path("%s", ref); | |
330 | if (stat(refdir, &st) < 0) | |
e1e22e37 LT |
331 | continue; |
332 | if (S_ISDIR(st.st_mode)) { | |
0bad611b | 333 | list = get_ref_dir(submodule, ref, list); |
e1e22e37 LT |
334 | continue; |
335 | } | |
0bad611b | 336 | if (submodule) { |
f8948e2f | 337 | hashclr(sha1); |
0bad611b HV |
338 | flag = 0; |
339 | if (resolve_gitlink_ref(submodule, ref, sha1) < 0) { | |
340 | hashclr(sha1); | |
341 | flag |= REF_BROKEN; | |
342 | } | |
343 | } else | |
344 | if (!resolve_ref(ref, sha1, 1, &flag)) { | |
345 | hashclr(sha1); | |
346 | flag |= REF_BROKEN; | |
347 | } | |
f4204ab9 | 348 | list = add_ref(ref, sha1, flag, list, NULL); |
e1e22e37 | 349 | } |
ed378ec7 | 350 | free(ref); |
e1e22e37 LT |
351 | closedir(dir); |
352 | } | |
c774aab9 | 353 | return sort_ref_list(list); |
e1e22e37 LT |
354 | } |
355 | ||
f8948e2f | 356 | struct warn_if_dangling_data { |
3cf6134a | 357 | FILE *fp; |
f8948e2f JH |
358 | const char *refname; |
359 | const char *msg_fmt; | |
360 | }; | |
361 | ||
362 | static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1, | |
363 | int flags, void *cb_data) | |
364 | { | |
365 | struct warn_if_dangling_data *d = cb_data; | |
366 | const char *resolves_to; | |
367 | unsigned char junk[20]; | |
368 | ||
369 | if (!(flags & REF_ISSYMREF)) | |
370 | return 0; | |
371 | ||
372 | resolves_to = resolve_ref(refname, junk, 0, NULL); | |
373 | if (!resolves_to || strcmp(resolves_to, d->refname)) | |
374 | return 0; | |
375 | ||
3cf6134a | 376 | fprintf(d->fp, d->msg_fmt, refname); |
f8948e2f JH |
377 | return 0; |
378 | } | |
379 | ||
3cf6134a | 380 | void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname) |
f8948e2f | 381 | { |
66dbfd55 GV |
382 | struct warn_if_dangling_data data; |
383 | ||
384 | data.fp = fp; | |
385 | data.refname = refname; | |
386 | data.msg_fmt = msg_fmt; | |
f8948e2f JH |
387 | for_each_rawref(warn_if_dangling_symref, &data); |
388 | } | |
389 | ||
0bad611b | 390 | static struct ref_list *get_loose_refs(const char *submodule) |
e1e22e37 | 391 | { |
4349a668 | 392 | struct cached_refs *refs = get_cached_refs(submodule); |
0bad611b | 393 | |
4349a668 MH |
394 | if (!refs->did_loose) { |
395 | refs->loose = get_ref_dir(submodule, "refs", NULL); | |
396 | refs->did_loose = 1; | |
e1e22e37 | 397 | } |
4349a668 | 398 | return refs->loose; |
e1e22e37 LT |
399 | } |
400 | ||
ca8db142 LT |
401 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
402 | #define MAXDEPTH 5 | |
0ebde32c LT |
403 | #define MAXREFLEN (1024) |
404 | ||
405 | static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result) | |
406 | { | |
407 | FILE *f; | |
db4dd93a | 408 | struct ref_list *packed_refs; |
0ebde32c LT |
409 | struct ref_list *ref; |
410 | int retval; | |
411 | ||
412 | strcpy(name + pathlen, "packed-refs"); | |
413 | f = fopen(name, "r"); | |
414 | if (!f) | |
415 | return -1; | |
db4dd93a | 416 | packed_refs = read_packed_refs(f); |
0ebde32c | 417 | fclose(f); |
db4dd93a | 418 | ref = packed_refs; |
0ebde32c LT |
419 | retval = -1; |
420 | while (ref) { | |
421 | if (!strcmp(ref->name, refname)) { | |
422 | retval = 0; | |
423 | memcpy(result, ref->sha1, 20); | |
424 | break; | |
425 | } | |
426 | ref = ref->next; | |
427 | } | |
db4dd93a | 428 | free_ref_list(packed_refs); |
0ebde32c LT |
429 | return retval; |
430 | } | |
431 | ||
432 | static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion) | |
433 | { | |
434 | int fd, len = strlen(refname); | |
435 | char buffer[128], *p; | |
436 | ||
437 | if (recursion > MAXDEPTH || len > MAXREFLEN) | |
438 | return -1; | |
439 | memcpy(name + pathlen, refname, len+1); | |
440 | fd = open(name, O_RDONLY); | |
441 | if (fd < 0) | |
442 | return resolve_gitlink_packed_ref(name, pathlen, refname, result); | |
443 | ||
444 | len = read(fd, buffer, sizeof(buffer)-1); | |
445 | close(fd); | |
446 | if (len < 0) | |
447 | return -1; | |
448 | while (len && isspace(buffer[len-1])) | |
449 | len--; | |
450 | buffer[len] = 0; | |
451 | ||
452 | /* Was it a detached head or an old-fashioned symlink? */ | |
453 | if (!get_sha1_hex(buffer, result)) | |
454 | return 0; | |
455 | ||
456 | /* Symref? */ | |
457 | if (strncmp(buffer, "ref:", 4)) | |
458 | return -1; | |
459 | p = buffer + 4; | |
460 | while (isspace(*p)) | |
461 | p++; | |
462 | ||
463 | return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1); | |
464 | } | |
465 | ||
466 | int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result) | |
467 | { | |
468 | int len = strlen(path), retval; | |
469 | char *gitdir; | |
842abf06 | 470 | const char *tmp; |
0ebde32c LT |
471 | |
472 | while (len && path[len-1] == '/') | |
473 | len--; | |
474 | if (!len) | |
475 | return -1; | |
476 | gitdir = xmalloc(len + MAXREFLEN + 8); | |
477 | memcpy(gitdir, path, len); | |
842abf06 LH |
478 | memcpy(gitdir + len, "/.git", 6); |
479 | len += 5; | |
480 | ||
481 | tmp = read_gitfile_gently(gitdir); | |
482 | if (tmp) { | |
483 | free(gitdir); | |
484 | len = strlen(tmp); | |
485 | gitdir = xmalloc(len + MAXREFLEN + 3); | |
486 | memcpy(gitdir, tmp, len); | |
487 | } | |
488 | gitdir[len] = '/'; | |
489 | gitdir[++len] = '\0'; | |
490 | retval = resolve_gitlink_ref_recursive(gitdir, len, refname, result, 0); | |
0ebde32c LT |
491 | free(gitdir); |
492 | return retval; | |
493 | } | |
ca8db142 | 494 | |
4886b89f CC |
495 | /* |
496 | * If the "reading" argument is set, this function finds out what _object_ | |
497 | * the ref points at by "reading" the ref. The ref, if it is not symbolic, | |
498 | * has to exist, and if it is symbolic, it has to point at an existing ref, | |
499 | * because the "read" goes through the symref to the ref it points at. | |
500 | * | |
501 | * The access that is not "reading" may often be "writing", but does not | |
502 | * have to; it can be merely checking _where it leads to_. If it is a | |
503 | * prelude to "writing" to the ref, a write to a symref that points at | |
504 | * yet-to-be-born ref will create the real ref pointed by the symref. | |
505 | * reading=0 allows the caller to check where such a symref leads to. | |
506 | */ | |
8da19775 | 507 | const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 508 | { |
0104ca09 HO |
509 | int depth = MAXDEPTH; |
510 | ssize_t len; | |
a876ed83 | 511 | char buffer[256]; |
ed378ec7 | 512 | static char ref_buffer[256]; |
ca8db142 | 513 | |
8da19775 JH |
514 | if (flag) |
515 | *flag = 0; | |
516 | ||
a876ed83 | 517 | for (;;) { |
958a4789 | 518 | char path[PATH_MAX]; |
a876ed83 JH |
519 | struct stat st; |
520 | char *buf; | |
521 | int fd; | |
8a65ff76 | 522 | |
a876ed83 JH |
523 | if (--depth < 0) |
524 | return NULL; | |
ca8db142 | 525 | |
958a4789 | 526 | git_snpath(path, sizeof(path), "%s", ref); |
4886b89f | 527 | /* Special case: non-existing file. */ |
a876ed83 | 528 | if (lstat(path, &st) < 0) { |
0bad611b | 529 | struct ref_list *list = get_packed_refs(NULL); |
434cd0cd | 530 | while (list) { |
f4204ab9 | 531 | if (!strcmp(ref, list->name)) { |
434cd0cd | 532 | hashcpy(sha1, list->sha1); |
8da19775 JH |
533 | if (flag) |
534 | *flag |= REF_ISPACKED; | |
434cd0cd LT |
535 | return ref; |
536 | } | |
537 | list = list->next; | |
538 | } | |
a876ed83 JH |
539 | if (reading || errno != ENOENT) |
540 | return NULL; | |
e702496e | 541 | hashclr(sha1); |
ed378ec7 | 542 | return ref; |
a876ed83 | 543 | } |
ca8db142 | 544 | |
a876ed83 JH |
545 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
546 | if (S_ISLNK(st.st_mode)) { | |
547 | len = readlink(path, buffer, sizeof(buffer)-1); | |
548 | if (len >= 5 && !memcmp("refs/", buffer, 5)) { | |
ed378ec7 LT |
549 | buffer[len] = 0; |
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 JH |
572 | close(fd); |
573 | ||
574 | /* | |
575 | * Is it a symbolic ref? | |
576 | */ | |
577 | if (len < 4 || memcmp("ref:", buffer, 4)) | |
578 | break; | |
579 | buf = buffer + 4; | |
580 | len -= 4; | |
581 | while (len && isspace(*buf)) | |
582 | buf++, len--; | |
583 | while (len && isspace(buf[len-1])) | |
ed378ec7 LT |
584 | len--; |
585 | buf[len] = 0; | |
586 | memcpy(ref_buffer, buf, len + 1); | |
587 | ref = ref_buffer; | |
8da19775 JH |
588 | if (flag) |
589 | *flag |= REF_ISSYMREF; | |
8a65ff76 | 590 | } |
a876ed83 JH |
591 | if (len < 40 || get_sha1_hex(buffer, sha1)) |
592 | return NULL; | |
ed378ec7 | 593 | return ref; |
a876ed83 JH |
594 | } |
595 | ||
d08bae7e IL |
596 | /* The argument to filter_refs */ |
597 | struct ref_filter { | |
598 | const char *pattern; | |
599 | each_ref_fn *fn; | |
600 | void *cb_data; | |
601 | }; | |
602 | ||
ed378ec7 | 603 | int read_ref(const char *ref, unsigned char *sha1) |
a876ed83 | 604 | { |
8da19775 | 605 | if (resolve_ref(ref, sha1, 1, NULL)) |
a876ed83 JH |
606 | return 0; |
607 | return -1; | |
8a65ff76 LT |
608 | } |
609 | ||
f8948e2f | 610 | #define DO_FOR_EACH_INCLUDE_BROKEN 01 |
ef06b918 | 611 | static int do_one_ref(const char *base, each_ref_fn fn, int trim, |
f8948e2f | 612 | int flags, void *cb_data, struct ref_list *entry) |
ef06b918 JH |
613 | { |
614 | if (strncmp(base, entry->name, trim)) | |
615 | return 0; | |
e01de1c9 | 616 | |
f8948e2f | 617 | if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) { |
e01de1c9 JH |
618 | if (entry->flag & REF_BROKEN) |
619 | return 0; /* ignore dangling symref */ | |
f8948e2f JH |
620 | if (!has_sha1_file(entry->sha1)) { |
621 | error("%s does not point to a valid object!", entry->name); | |
622 | return 0; | |
623 | } | |
ef06b918 | 624 | } |
0ae91be0 | 625 | current_ref = entry; |
ef06b918 JH |
626 | return fn(entry->name + trim, entry->sha1, entry->flag, cb_data); |
627 | } | |
628 | ||
d08bae7e IL |
629 | static int filter_refs(const char *ref, const unsigned char *sha, int flags, |
630 | void *data) | |
631 | { | |
632 | struct ref_filter *filter = (struct ref_filter *)data; | |
633 | if (fnmatch(filter->pattern, ref, 0)) | |
634 | return 0; | |
635 | return filter->fn(ref, sha, flags, filter->cb_data); | |
636 | } | |
637 | ||
cf0adba7 JH |
638 | int peel_ref(const char *ref, unsigned char *sha1) |
639 | { | |
640 | int flag; | |
641 | unsigned char base[20]; | |
642 | struct object *o; | |
643 | ||
0ae91be0 SP |
644 | if (current_ref && (current_ref->name == ref |
645 | || !strcmp(current_ref->name, ref))) { | |
646 | if (current_ref->flag & REF_KNOWS_PEELED) { | |
647 | hashcpy(sha1, current_ref->peeled); | |
648 | return 0; | |
649 | } | |
650 | hashcpy(base, current_ref->sha1); | |
651 | goto fallback; | |
652 | } | |
653 | ||
cf0adba7 JH |
654 | if (!resolve_ref(ref, base, 1, &flag)) |
655 | return -1; | |
656 | ||
657 | if ((flag & REF_ISPACKED)) { | |
0bad611b | 658 | struct ref_list *list = get_packed_refs(NULL); |
cf0adba7 JH |
659 | |
660 | while (list) { | |
f4204ab9 JH |
661 | if (!strcmp(list->name, ref)) { |
662 | if (list->flag & REF_KNOWS_PEELED) { | |
663 | hashcpy(sha1, list->peeled); | |
664 | return 0; | |
665 | } | |
666 | /* older pack-refs did not leave peeled ones */ | |
667 | break; | |
cf0adba7 JH |
668 | } |
669 | list = list->next; | |
670 | } | |
cf0adba7 JH |
671 | } |
672 | ||
0ae91be0 | 673 | fallback: |
cf0adba7 | 674 | o = parse_object(base); |
8c87dc77 | 675 | if (o && o->type == OBJ_TAG) { |
cf0adba7 JH |
676 | o = deref_tag(o, ref, 0); |
677 | if (o) { | |
678 | hashcpy(sha1, o->sha1); | |
679 | return 0; | |
680 | } | |
681 | } | |
682 | return -1; | |
683 | } | |
684 | ||
0bad611b HV |
685 | static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn, |
686 | int trim, int flags, void *cb_data) | |
8a65ff76 | 687 | { |
0ae91be0 | 688 | int retval = 0; |
0bad611b HV |
689 | struct ref_list *packed = get_packed_refs(submodule); |
690 | struct ref_list *loose = get_loose_refs(submodule); | |
8a65ff76 | 691 | |
e142a3c6 DB |
692 | struct ref_list *extra; |
693 | ||
694 | for (extra = extra_refs; extra; extra = extra->next) | |
f8948e2f | 695 | retval = do_one_ref(base, fn, trim, flags, cb_data, extra); |
e142a3c6 | 696 | |
e1e22e37 LT |
697 | while (packed && loose) { |
698 | struct ref_list *entry; | |
699 | int cmp = strcmp(packed->name, loose->name); | |
700 | if (!cmp) { | |
701 | packed = packed->next; | |
702 | continue; | |
6cada6a9 | 703 | } |
e1e22e37 LT |
704 | if (cmp > 0) { |
705 | entry = loose; | |
706 | loose = loose->next; | |
707 | } else { | |
708 | entry = packed; | |
709 | packed = packed->next; | |
710 | } | |
f8948e2f | 711 | retval = do_one_ref(base, fn, trim, flags, cb_data, entry); |
e1e22e37 | 712 | if (retval) |
0ae91be0 | 713 | goto end_each; |
e1e22e37 | 714 | } |
8a65ff76 | 715 | |
ef06b918 | 716 | for (packed = packed ? packed : loose; packed; packed = packed->next) { |
f8948e2f | 717 | retval = do_one_ref(base, fn, trim, flags, cb_data, packed); |
ef06b918 | 718 | if (retval) |
0ae91be0 | 719 | goto end_each; |
8a65ff76 | 720 | } |
0ae91be0 SP |
721 | |
722 | end_each: | |
723 | current_ref = NULL; | |
724 | return retval; | |
8a65ff76 LT |
725 | } |
726 | ||
0bad611b HV |
727 | |
728 | static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data) | |
723c31fe LT |
729 | { |
730 | unsigned char sha1[20]; | |
8da19775 JH |
731 | int flag; |
732 | ||
0bad611b HV |
733 | if (submodule) { |
734 | if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0) | |
735 | return fn("HEAD", sha1, 0, cb_data); | |
736 | ||
737 | return 0; | |
738 | } | |
739 | ||
8da19775 JH |
740 | if (resolve_ref("HEAD", sha1, 1, &flag)) |
741 | return fn("HEAD", sha1, flag, cb_data); | |
0bad611b | 742 | |
2f34ba32 | 743 | return 0; |
723c31fe LT |
744 | } |
745 | ||
0bad611b HV |
746 | int head_ref(each_ref_fn fn, void *cb_data) |
747 | { | |
748 | return do_head_ref(NULL, fn, cb_data); | |
749 | } | |
750 | ||
9ef6aeb0 HV |
751 | int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
752 | { | |
753 | return do_head_ref(submodule, fn, cb_data); | |
754 | } | |
755 | ||
cb5d709f | 756 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 757 | { |
0bad611b | 758 | return do_for_each_ref(NULL, "refs/", fn, 0, 0, cb_data); |
a62be77f SE |
759 | } |
760 | ||
9ef6aeb0 HV |
761 | int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
762 | { | |
763 | return do_for_each_ref(submodule, "refs/", fn, 0, 0, cb_data); | |
a62be77f SE |
764 | } |
765 | ||
2a8177b6 CC |
766 | int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data) |
767 | { | |
0bad611b | 768 | return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data); |
2a8177b6 CC |
769 | } |
770 | ||
9ef6aeb0 HV |
771 | int for_each_ref_in_submodule(const char *submodule, const char *prefix, |
772 | each_ref_fn fn, void *cb_data) | |
773 | { | |
774 | return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data); | |
2a8177b6 CC |
775 | } |
776 | ||
cb5d709f | 777 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 778 | { |
2a8177b6 | 779 | return for_each_ref_in("refs/tags/", fn, cb_data); |
a62be77f SE |
780 | } |
781 | ||
9ef6aeb0 HV |
782 | int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
783 | { | |
784 | return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data); | |
785 | } | |
786 | ||
cb5d709f | 787 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 788 | { |
2a8177b6 | 789 | return for_each_ref_in("refs/heads/", fn, cb_data); |
a62be77f SE |
790 | } |
791 | ||
9ef6aeb0 HV |
792 | int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
793 | { | |
794 | return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data); | |
795 | } | |
796 | ||
cb5d709f | 797 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 798 | { |
2a8177b6 | 799 | return for_each_ref_in("refs/remotes/", fn, cb_data); |
f8948e2f JH |
800 | } |
801 | ||
9ef6aeb0 HV |
802 | int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
803 | { | |
804 | return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data); | |
805 | } | |
806 | ||
29268700 CC |
807 | int for_each_replace_ref(each_ref_fn fn, void *cb_data) |
808 | { | |
0bad611b | 809 | return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data); |
29268700 CC |
810 | } |
811 | ||
b09fe971 IL |
812 | int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, |
813 | const char *prefix, void *cb_data) | |
d08bae7e IL |
814 | { |
815 | struct strbuf real_pattern = STRBUF_INIT; | |
816 | struct ref_filter filter; | |
d08bae7e IL |
817 | int ret; |
818 | ||
b09fe971 | 819 | if (!prefix && prefixcmp(pattern, "refs/")) |
d08bae7e | 820 | strbuf_addstr(&real_pattern, "refs/"); |
b09fe971 IL |
821 | else if (prefix) |
822 | strbuf_addstr(&real_pattern, prefix); | |
d08bae7e IL |
823 | strbuf_addstr(&real_pattern, pattern); |
824 | ||
894a9d33 | 825 | if (!has_glob_specials(pattern)) { |
9517e6b8 | 826 | /* Append implied '/' '*' if not present. */ |
d08bae7e IL |
827 | if (real_pattern.buf[real_pattern.len - 1] != '/') |
828 | strbuf_addch(&real_pattern, '/'); | |
829 | /* No need to check for '*', there is none. */ | |
830 | strbuf_addch(&real_pattern, '*'); | |
831 | } | |
832 | ||
833 | filter.pattern = real_pattern.buf; | |
834 | filter.fn = fn; | |
835 | filter.cb_data = cb_data; | |
836 | ret = for_each_ref(filter_refs, &filter); | |
837 | ||
838 | strbuf_release(&real_pattern); | |
839 | return ret; | |
840 | } | |
841 | ||
b09fe971 IL |
842 | int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data) |
843 | { | |
844 | return for_each_glob_ref_in(fn, pattern, NULL, cb_data); | |
845 | } | |
846 | ||
f8948e2f JH |
847 | int for_each_rawref(each_ref_fn fn, void *cb_data) |
848 | { | |
0bad611b | 849 | return do_for_each_ref(NULL, "refs/", fn, 0, |
f8948e2f | 850 | DO_FOR_EACH_INCLUDE_BROKEN, cb_data); |
8a65ff76 LT |
851 | } |
852 | ||
03feddd6 JH |
853 | /* |
854 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
855 | * We do not like it if: | |
856 | * | |
857 | * - any path component of it begins with ".", or | |
858 | * - it has double dots "..", or | |
859 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
860 | * - it ends with a "/". | |
3e262b95 | 861 | * - it ends with ".lock" |
a4c2e699 | 862 | * - it contains a "\" (backslash) |
03feddd6 JH |
863 | */ |
864 | ||
865 | static inline int bad_ref_char(int ch) | |
866 | { | |
8558fd9e | 867 | if (((unsigned) ch) <= ' ' || |
a4c2e699 | 868 | ch == '~' || ch == '^' || ch == ':' || ch == '\\') |
8558fd9e DB |
869 | return 1; |
870 | /* 2.13 Pattern Matching Notation */ | |
871 | if (ch == '?' || ch == '[') /* Unsupported */ | |
872 | return 1; | |
873 | if (ch == '*') /* Supported at the end */ | |
874 | return 2; | |
875 | return 0; | |
03feddd6 JH |
876 | } |
877 | ||
95fc7512 DB |
878 | int check_ref_format(const char *ref) |
879 | { | |
cbdffe40 | 880 | int ch, level, bad_type, last; |
abd2bde7 | 881 | int ret = CHECK_REF_FORMAT_OK; |
03feddd6 JH |
882 | const char *cp = ref; |
883 | ||
884 | level = 0; | |
885 | while (1) { | |
886 | while ((ch = *cp++) == '/') | |
887 | ; /* tolerate duplicated slashes */ | |
888 | if (!ch) | |
5f7b202a JH |
889 | /* should not end with slashes */ |
890 | return CHECK_REF_FORMAT_ERROR; | |
03feddd6 JH |
891 | |
892 | /* we are at the beginning of the path component */ | |
8558fd9e | 893 | if (ch == '.') |
5f7b202a | 894 | return CHECK_REF_FORMAT_ERROR; |
8558fd9e DB |
895 | bad_type = bad_ref_char(ch); |
896 | if (bad_type) { | |
abd2bde7 DB |
897 | if (bad_type == 2 && (!*cp || *cp == '/') && |
898 | ret == CHECK_REF_FORMAT_OK) | |
899 | ret = CHECK_REF_FORMAT_WILDCARD; | |
900 | else | |
901 | return CHECK_REF_FORMAT_ERROR; | |
8558fd9e | 902 | } |
03feddd6 | 903 | |
cbdffe40 | 904 | last = ch; |
03feddd6 JH |
905 | /* scan the rest of the path component */ |
906 | while ((ch = *cp++) != 0) { | |
8558fd9e | 907 | bad_type = bad_ref_char(ch); |
cbdffe40 | 908 | if (bad_type) |
08fbdb30 | 909 | return CHECK_REF_FORMAT_ERROR; |
03feddd6 JH |
910 | if (ch == '/') |
911 | break; | |
cbdffe40 JH |
912 | if (last == '.' && ch == '.') |
913 | return CHECK_REF_FORMAT_ERROR; | |
914 | if (last == '@' && ch == '{') | |
5f7b202a | 915 | return CHECK_REF_FORMAT_ERROR; |
cbdffe40 | 916 | last = ch; |
03feddd6 JH |
917 | } |
918 | level++; | |
919 | if (!ch) { | |
cbdffe40 JH |
920 | if (ref <= cp - 2 && cp[-2] == '.') |
921 | return CHECK_REF_FORMAT_ERROR; | |
03feddd6 | 922 | if (level < 2) |
5f7b202a | 923 | return CHECK_REF_FORMAT_ONELEVEL; |
3e262b95 SP |
924 | if (has_extension(ref, ".lock")) |
925 | return CHECK_REF_FORMAT_ERROR; | |
abd2bde7 | 926 | return ret; |
03feddd6 JH |
927 | } |
928 | } | |
95fc7512 DB |
929 | } |
930 | ||
4577e483 | 931 | const char *prettify_refname(const char *name) |
a9c37a72 | 932 | { |
a9c37a72 DB |
933 | return name + ( |
934 | !prefixcmp(name, "refs/heads/") ? 11 : | |
935 | !prefixcmp(name, "refs/tags/") ? 10 : | |
936 | !prefixcmp(name, "refs/remotes/") ? 13 : | |
937 | 0); | |
938 | } | |
939 | ||
79803322 SP |
940 | const char *ref_rev_parse_rules[] = { |
941 | "%.*s", | |
942 | "refs/%.*s", | |
943 | "refs/tags/%.*s", | |
944 | "refs/heads/%.*s", | |
945 | "refs/remotes/%.*s", | |
946 | "refs/remotes/%.*s/HEAD", | |
947 | NULL | |
948 | }; | |
949 | ||
605b4978 SP |
950 | const char *ref_fetch_rules[] = { |
951 | "%.*s", | |
952 | "refs/%.*s", | |
953 | "refs/heads/%.*s", | |
954 | NULL | |
955 | }; | |
956 | ||
79803322 SP |
957 | int refname_match(const char *abbrev_name, const char *full_name, const char **rules) |
958 | { | |
959 | const char **p; | |
960 | const int abbrev_name_len = strlen(abbrev_name); | |
961 | ||
962 | for (p = rules; *p; p++) { | |
963 | if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { | |
964 | return 1; | |
965 | } | |
966 | } | |
967 | ||
968 | return 0; | |
969 | } | |
970 | ||
e5f38ec3 | 971 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
972 | const unsigned char *old_sha1, int mustexist) |
973 | { | |
8da19775 | 974 | if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 975 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
976 | unlock_ref(lock); |
977 | return NULL; | |
978 | } | |
a89fccd2 | 979 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 980 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
981 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
982 | unlock_ref(lock); | |
983 | return NULL; | |
984 | } | |
985 | return lock; | |
986 | } | |
987 | ||
7155b727 | 988 | static int remove_empty_directories(const char *file) |
bc7127ef JH |
989 | { |
990 | /* we want to create a file but there is a directory there; | |
991 | * if that is an empty directory (or a directory that contains | |
992 | * only empty directories), remove them. | |
993 | */ | |
7155b727 JS |
994 | struct strbuf path; |
995 | int result; | |
bc7127ef | 996 | |
7155b727 JS |
997 | strbuf_init(&path, 20); |
998 | strbuf_addstr(&path, file); | |
999 | ||
a0f4afbe | 1000 | result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY); |
7155b727 JS |
1001 | |
1002 | strbuf_release(&path); | |
1003 | ||
1004 | return result; | |
bc7127ef JH |
1005 | } |
1006 | ||
c976d415 LH |
1007 | static int is_refname_available(const char *ref, const char *oldref, |
1008 | struct ref_list *list, int quiet) | |
1009 | { | |
1010 | int namlen = strlen(ref); /* e.g. 'foo/bar' */ | |
1011 | while (list) { | |
1012 | /* list->name could be 'foo' or 'foo/bar/baz' */ | |
1013 | if (!oldref || strcmp(oldref, list->name)) { | |
1014 | int len = strlen(list->name); | |
1015 | int cmplen = (namlen < len) ? namlen : len; | |
1016 | const char *lead = (namlen < len) ? list->name : ref; | |
1017 | if (!strncmp(ref, list->name, cmplen) && | |
1018 | lead[cmplen] == '/') { | |
1019 | if (!quiet) | |
1020 | error("'%s' exists; cannot create '%s'", | |
1021 | list->name, ref); | |
1022 | return 0; | |
1023 | } | |
1024 | } | |
1025 | list = list->next; | |
1026 | } | |
1027 | return 1; | |
1028 | } | |
1029 | ||
68db31cc | 1030 | static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p) |
4bd18c43 | 1031 | { |
434cd0cd | 1032 | char *ref_file; |
ed378ec7 | 1033 | const char *orig_ref = ref; |
4bd18c43 | 1034 | struct ref_lock *lock; |
5cc3cef9 | 1035 | int last_errno = 0; |
acd3b9ec | 1036 | int type, lflags; |
4431fcc4 | 1037 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
5bdd8d4a | 1038 | int missing = 0; |
4bd18c43 SP |
1039 | |
1040 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
1041 | lock->lock_fd = -1; | |
1042 | ||
68db31cc | 1043 | ref = resolve_ref(ref, lock->old_sha1, mustexist, &type); |
bc7127ef JH |
1044 | if (!ref && errno == EISDIR) { |
1045 | /* we are trying to lock foo but we used to | |
1046 | * have foo/bar which now does not exist; | |
1047 | * it is normal for the empty directory 'foo' | |
1048 | * to remain. | |
1049 | */ | |
1050 | ref_file = git_path("%s", orig_ref); | |
5cc3cef9 JH |
1051 | if (remove_empty_directories(ref_file)) { |
1052 | last_errno = errno; | |
1053 | error("there are still refs under '%s'", orig_ref); | |
1054 | goto error_return; | |
1055 | } | |
68db31cc | 1056 | ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type); |
bc7127ef | 1057 | } |
68db31cc SV |
1058 | if (type_p) |
1059 | *type_p = type; | |
ed378ec7 | 1060 | if (!ref) { |
5cc3cef9 | 1061 | last_errno = errno; |
818f477c | 1062 | error("unable to resolve reference %s: %s", |
ed378ec7 | 1063 | orig_ref, strerror(errno)); |
5cc3cef9 | 1064 | goto error_return; |
4bd18c43 | 1065 | } |
5bdd8d4a | 1066 | missing = is_null_sha1(lock->old_sha1); |
c976d415 LH |
1067 | /* When the ref did not exist and we are creating it, |
1068 | * make sure there is no existing ref that is packed | |
1069 | * whose name begins with our refname, nor a ref whose | |
1070 | * name is a proper prefix of our refname. | |
1071 | */ | |
5bdd8d4a | 1072 | if (missing && |
0bad611b | 1073 | !is_refname_available(ref, NULL, get_packed_refs(NULL), 0)) { |
f475e08e | 1074 | last_errno = ENOTDIR; |
c976d415 | 1075 | goto error_return; |
f475e08e | 1076 | } |
22a3844e | 1077 | |
c33d5174 | 1078 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 1079 | |
acd3b9ec JH |
1080 | lflags = LOCK_DIE_ON_ERROR; |
1081 | if (flags & REF_NODEREF) { | |
68db31cc | 1082 | ref = orig_ref; |
acd3b9ec JH |
1083 | lflags |= LOCK_NODEREF; |
1084 | } | |
434cd0cd | 1085 | lock->ref_name = xstrdup(ref); |
1655707c | 1086 | lock->orig_ref_name = xstrdup(orig_ref); |
7c1a278d | 1087 | ref_file = git_path("%s", ref); |
5bdd8d4a | 1088 | if (missing) |
68db31cc SV |
1089 | lock->force_write = 1; |
1090 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
1091 | lock->force_write = 1; | |
4bd18c43 | 1092 | |
5cc3cef9 JH |
1093 | if (safe_create_leading_directories(ref_file)) { |
1094 | last_errno = errno; | |
1095 | error("unable to create directory for %s", ref_file); | |
1096 | goto error_return; | |
1097 | } | |
4bd18c43 | 1098 | |
acd3b9ec | 1099 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags); |
4bd18c43 | 1100 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; |
5cc3cef9 JH |
1101 | |
1102 | error_return: | |
1103 | unlock_ref(lock); | |
1104 | errno = last_errno; | |
1105 | return NULL; | |
4bd18c43 SP |
1106 | } |
1107 | ||
4431fcc4 | 1108 | struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1) |
95fc7512 | 1109 | { |
53cce84c | 1110 | char refpath[PATH_MAX]; |
95fc7512 | 1111 | if (check_ref_format(ref)) |
4bd18c43 | 1112 | return NULL; |
53cce84c | 1113 | strcpy(refpath, mkpath("refs/%s", ref)); |
68db31cc | 1114 | return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL); |
4bd18c43 SP |
1115 | } |
1116 | ||
68db31cc | 1117 | struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags) |
4bd18c43 | 1118 | { |
5f7b202a | 1119 | switch (check_ref_format(ref)) { |
5f7b202a | 1120 | default: |
257f3020 JH |
1121 | return NULL; |
1122 | case 0: | |
1123 | case CHECK_REF_FORMAT_ONELEVEL: | |
5f7b202a JH |
1124 | return lock_ref_sha1_basic(ref, old_sha1, flags, NULL); |
1125 | } | |
c0277d15 JH |
1126 | } |
1127 | ||
26a063a1 JH |
1128 | static struct lock_file packlock; |
1129 | ||
c0277d15 JH |
1130 | static int repack_without_ref(const char *refname) |
1131 | { | |
1132 | struct ref_list *list, *packed_ref_list; | |
1133 | int fd; | |
1134 | int found = 0; | |
c0277d15 | 1135 | |
0bad611b | 1136 | packed_ref_list = get_packed_refs(NULL); |
c0277d15 JH |
1137 | for (list = packed_ref_list; list; list = list->next) { |
1138 | if (!strcmp(refname, list->name)) { | |
1139 | found = 1; | |
1140 | break; | |
1141 | } | |
1142 | } | |
1143 | if (!found) | |
1144 | return 0; | |
c0277d15 | 1145 | fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0); |
1b018fd9 MV |
1146 | if (fd < 0) { |
1147 | unable_to_lock_error(git_path("packed-refs"), errno); | |
c0277d15 | 1148 | return error("cannot delete '%s' from packed refs", refname); |
1b018fd9 | 1149 | } |
c0277d15 JH |
1150 | |
1151 | for (list = packed_ref_list; list; list = list->next) { | |
1152 | char line[PATH_MAX + 100]; | |
1153 | int len; | |
1154 | ||
1155 | if (!strcmp(refname, list->name)) | |
1156 | continue; | |
1157 | len = snprintf(line, sizeof(line), "%s %s\n", | |
1158 | sha1_to_hex(list->sha1), list->name); | |
1159 | /* this should not happen but just being defensive */ | |
1160 | if (len > sizeof(line)) | |
1161 | die("too long a refname '%s'", list->name); | |
1162 | write_or_die(fd, line, len); | |
1163 | } | |
1164 | return commit_lock_file(&packlock); | |
1165 | } | |
1166 | ||
eca35a25 | 1167 | int delete_ref(const char *refname, const unsigned char *sha1, int delopt) |
c0277d15 JH |
1168 | { |
1169 | struct ref_lock *lock; | |
eca35a25 | 1170 | int err, i = 0, ret = 0, flag = 0; |
c0277d15 | 1171 | |
68db31cc | 1172 | lock = lock_ref_sha1_basic(refname, sha1, 0, &flag); |
c0277d15 JH |
1173 | if (!lock) |
1174 | return 1; | |
045a476f | 1175 | if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) { |
c0277d15 | 1176 | /* loose */ |
eca35a25 MV |
1177 | const char *path; |
1178 | ||
1179 | if (!(delopt & REF_NODEREF)) { | |
1180 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
1181 | lock->lk->filename[i] = 0; | |
1182 | path = lock->lk->filename; | |
1183 | } else { | |
9db56f71 | 1184 | path = git_path("%s", refname); |
eca35a25 | 1185 | } |
691f1a28 AR |
1186 | err = unlink_or_warn(path); |
1187 | if (err && errno != ENOENT) | |
c0277d15 | 1188 | ret = 1; |
691f1a28 | 1189 | |
eca35a25 MV |
1190 | if (!(delopt & REF_NODEREF)) |
1191 | lock->lk->filename[i] = '.'; | |
c0277d15 JH |
1192 | } |
1193 | /* removing the loose one could have resurrected an earlier | |
1194 | * packed one. Also, if it was not loose we need to repack | |
1195 | * without it. | |
1196 | */ | |
1197 | ret |= repack_without_ref(refname); | |
1198 | ||
691f1a28 | 1199 | unlink_or_warn(git_path("logs/%s", lock->ref_name)); |
c0277d15 JH |
1200 | invalidate_cached_refs(); |
1201 | unlock_ref(lock); | |
1202 | return ret; | |
4bd18c43 SP |
1203 | } |
1204 | ||
765c2258 PH |
1205 | /* |
1206 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
1207 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
1208 | * | |
1209 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
1210 | * live into logs/refs. | |
1211 | */ | |
1212 | #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log" | |
1213 | ||
678d0f4c | 1214 | int rename_ref(const char *oldref, const char *newref, const char *logmsg) |
c976d415 LH |
1215 | { |
1216 | static const char renamed_ref[] = "RENAMED-REF"; | |
1217 | unsigned char sha1[20], orig_sha1[20]; | |
1218 | int flag = 0, logmoved = 0; | |
1219 | struct ref_lock *lock; | |
c976d415 | 1220 | struct stat loginfo; |
16c2bfbb | 1221 | int log = !lstat(git_path("logs/%s", oldref), &loginfo); |
eca35a25 | 1222 | const char *symref = NULL; |
c976d415 | 1223 | |
450d4c0f | 1224 | if (log && S_ISLNK(loginfo.st_mode)) |
c976d415 LH |
1225 | return error("reflog for %s is a symlink", oldref); |
1226 | ||
eca35a25 MV |
1227 | symref = resolve_ref(oldref, orig_sha1, 1, &flag); |
1228 | if (flag & REF_ISSYMREF) | |
fa58186c MV |
1229 | return error("refname %s is a symbolic ref, renaming it is not supported", |
1230 | oldref); | |
eca35a25 | 1231 | if (!symref) |
c976d415 LH |
1232 | return error("refname %s not found", oldref); |
1233 | ||
0bad611b | 1234 | if (!is_refname_available(newref, oldref, get_packed_refs(NULL), 0)) |
c976d415 LH |
1235 | return 1; |
1236 | ||
0bad611b | 1237 | if (!is_refname_available(newref, oldref, get_loose_refs(NULL), 0)) |
c976d415 LH |
1238 | return 1; |
1239 | ||
68db31cc | 1240 | lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL); |
c976d415 LH |
1241 | if (!lock) |
1242 | return error("unable to lock %s", renamed_ref); | |
1243 | lock->force_write = 1; | |
678d0f4c | 1244 | if (write_ref_sha1(lock, orig_sha1, logmsg)) |
c976d415 LH |
1245 | return error("unable to save current sha1 in %s", renamed_ref); |
1246 | ||
765c2258 PH |
1247 | if (log && rename(git_path("logs/%s", oldref), git_path(TMP_RENAMED_LOG))) |
1248 | return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s", | |
c976d415 LH |
1249 | oldref, strerror(errno)); |
1250 | ||
eca35a25 | 1251 | if (delete_ref(oldref, orig_sha1, REF_NODEREF)) { |
c976d415 LH |
1252 | error("unable to delete old %s", oldref); |
1253 | goto rollback; | |
1254 | } | |
1255 | ||
eca35a25 | 1256 | if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1, REF_NODEREF)) { |
c976d415 LH |
1257 | if (errno==EISDIR) { |
1258 | if (remove_empty_directories(git_path("%s", newref))) { | |
1259 | error("Directory not empty: %s", newref); | |
1260 | goto rollback; | |
1261 | } | |
1262 | } else { | |
1263 | error("unable to delete existing %s", newref); | |
1264 | goto rollback; | |
1265 | } | |
1266 | } | |
1267 | ||
1268 | if (log && safe_create_leading_directories(git_path("logs/%s", newref))) { | |
1269 | error("unable to create directory for %s", newref); | |
1270 | goto rollback; | |
1271 | } | |
1272 | ||
1273 | retry: | |
765c2258 | 1274 | if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newref))) { |
d9e74d57 JR |
1275 | if (errno==EISDIR || errno==ENOTDIR) { |
1276 | /* | |
1277 | * rename(a, b) when b is an existing | |
1278 | * directory ought to result in ISDIR, but | |
1279 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
1280 | */ | |
c976d415 LH |
1281 | if (remove_empty_directories(git_path("logs/%s", newref))) { |
1282 | error("Directory not empty: logs/%s", newref); | |
1283 | goto rollback; | |
1284 | } | |
1285 | goto retry; | |
1286 | } else { | |
765c2258 | 1287 | error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s", |
c976d415 LH |
1288 | newref, strerror(errno)); |
1289 | goto rollback; | |
1290 | } | |
1291 | } | |
1292 | logmoved = log; | |
1293 | ||
68db31cc | 1294 | lock = lock_ref_sha1_basic(newref, NULL, 0, NULL); |
c976d415 LH |
1295 | if (!lock) { |
1296 | error("unable to lock %s for update", newref); | |
1297 | goto rollback; | |
1298 | } | |
c976d415 LH |
1299 | lock->force_write = 1; |
1300 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 1301 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
c976d415 LH |
1302 | error("unable to write current sha1 into %s", newref); |
1303 | goto rollback; | |
1304 | } | |
1305 | ||
1306 | return 0; | |
1307 | ||
1308 | rollback: | |
68db31cc | 1309 | lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL); |
c976d415 LH |
1310 | if (!lock) { |
1311 | error("unable to lock %s for rollback", oldref); | |
1312 | goto rollbacklog; | |
1313 | } | |
1314 | ||
1315 | lock->force_write = 1; | |
1316 | flag = log_all_ref_updates; | |
1317 | log_all_ref_updates = 0; | |
1318 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
1319 | error("unable to write current sha1 into %s", oldref); | |
1320 | log_all_ref_updates = flag; | |
1321 | ||
1322 | rollbacklog: | |
1323 | if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref))) | |
1324 | error("unable to restore logfile %s from %s: %s", | |
1325 | oldref, newref, strerror(errno)); | |
1326 | if (!logmoved && log && | |
765c2258 PH |
1327 | rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldref))) |
1328 | error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s", | |
c976d415 LH |
1329 | oldref, strerror(errno)); |
1330 | ||
1331 | return 1; | |
1332 | } | |
1333 | ||
435fc852 | 1334 | int close_ref(struct ref_lock *lock) |
b531394d BC |
1335 | { |
1336 | if (close_lock_file(lock->lk)) | |
1337 | return -1; | |
1338 | lock->lock_fd = -1; | |
1339 | return 0; | |
1340 | } | |
1341 | ||
435fc852 | 1342 | int commit_ref(struct ref_lock *lock) |
b531394d BC |
1343 | { |
1344 | if (commit_lock_file(lock->lk)) | |
1345 | return -1; | |
1346 | lock->lock_fd = -1; | |
1347 | return 0; | |
1348 | } | |
1349 | ||
e5f38ec3 | 1350 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 | 1351 | { |
4ed7cd3a BC |
1352 | /* Do not free lock->lk -- atexit() still looks at them */ |
1353 | if (lock->lk) | |
1354 | rollback_lock_file(lock->lk); | |
434cd0cd | 1355 | free(lock->ref_name); |
1655707c | 1356 | free(lock->orig_ref_name); |
4bd18c43 SP |
1357 | free(lock); |
1358 | } | |
1359 | ||
0ec29a47 JH |
1360 | /* |
1361 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
1362 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
1363 | * because reflog file is one line per entry. | |
1364 | */ | |
1365 | static int copy_msg(char *buf, const char *msg) | |
1366 | { | |
1367 | char *cp = buf; | |
1368 | char c; | |
1369 | int wasspace = 1; | |
1370 | ||
1371 | *cp++ = '\t'; | |
1372 | while ((c = *msg++)) { | |
1373 | if (wasspace && isspace(c)) | |
1374 | continue; | |
1375 | wasspace = isspace(c); | |
1376 | if (wasspace) | |
1377 | c = ' '; | |
1378 | *cp++ = c; | |
1379 | } | |
1380 | while (buf < cp && isspace(cp[-1])) | |
1381 | cp--; | |
1382 | *cp++ = '\n'; | |
1383 | return cp - buf; | |
1384 | } | |
1385 | ||
157aaea5 | 1386 | int log_ref_setup(const char *ref_name, char *logfile, int bufsize) |
6de08ae6 | 1387 | { |
859c3017 | 1388 | int logfd, oflags = O_APPEND | O_WRONLY; |
9a13f0b7 | 1389 | |
157aaea5 | 1390 | git_snpath(logfile, bufsize, "logs/%s", ref_name); |
4057deb5 | 1391 | if (log_all_ref_updates && |
cc44c765 JH |
1392 | (!prefixcmp(ref_name, "refs/heads/") || |
1393 | !prefixcmp(ref_name, "refs/remotes/") || | |
b2e256b0 | 1394 | !prefixcmp(ref_name, "refs/notes/") || |
bd104db1 | 1395 | !strcmp(ref_name, "HEAD"))) { |
157aaea5 | 1396 | if (safe_create_leading_directories(logfile) < 0) |
6de08ae6 | 1397 | return error("unable to create directory for %s", |
157aaea5 | 1398 | logfile); |
6de08ae6 SP |
1399 | oflags |= O_CREAT; |
1400 | } | |
1401 | ||
157aaea5 | 1402 | logfd = open(logfile, oflags, 0666); |
6de08ae6 | 1403 | if (logfd < 0) { |
1974bf62 | 1404 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 1405 | return 0; |
3b463c3f JH |
1406 | |
1407 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
157aaea5 | 1408 | if (remove_empty_directories(logfile)) { |
3b463c3f | 1409 | return error("There are still logs under '%s'", |
157aaea5 | 1410 | logfile); |
3b463c3f | 1411 | } |
157aaea5 | 1412 | logfd = open(logfile, oflags, 0666); |
3b463c3f JH |
1413 | } |
1414 | ||
1415 | if (logfd < 0) | |
1416 | return error("Unable to append to %s: %s", | |
157aaea5 | 1417 | logfile, strerror(errno)); |
6de08ae6 SP |
1418 | } |
1419 | ||
157aaea5 | 1420 | adjust_shared_perm(logfile); |
859c3017 EM |
1421 | close(logfd); |
1422 | return 0; | |
1423 | } | |
443b92b6 | 1424 | |
859c3017 EM |
1425 | static int log_ref_write(const char *ref_name, const unsigned char *old_sha1, |
1426 | const unsigned char *new_sha1, const char *msg) | |
1427 | { | |
1428 | int logfd, result, written, oflags = O_APPEND | O_WRONLY; | |
1429 | unsigned maxlen, len; | |
1430 | int msglen; | |
157aaea5 | 1431 | char log_file[PATH_MAX]; |
859c3017 EM |
1432 | char *logrec; |
1433 | const char *committer; | |
1434 | ||
1435 | if (log_all_ref_updates < 0) | |
1436 | log_all_ref_updates = !is_bare_repository(); | |
1437 | ||
157aaea5 | 1438 | result = log_ref_setup(ref_name, log_file, sizeof(log_file)); |
859c3017 EM |
1439 | if (result) |
1440 | return result; | |
1441 | ||
1442 | logfd = open(log_file, oflags); | |
1443 | if (logfd < 0) | |
1444 | return 0; | |
0ec29a47 | 1445 | msglen = msg ? strlen(msg) : 0; |
774751a8 | 1446 | committer = git_committer_info(0); |
8ac65937 JH |
1447 | maxlen = strlen(committer) + msglen + 100; |
1448 | logrec = xmalloc(maxlen); | |
1449 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
1450 | sha1_to_hex(old_sha1), |
1451 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
1452 | committer); |
1453 | if (msglen) | |
0ec29a47 | 1454 | len += copy_msg(logrec + len - 1, msg) - 1; |
93822c22 | 1455 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 | 1456 | free(logrec); |
91c8d590 | 1457 | if (close(logfd) != 0 || written != len) |
9a13f0b7 | 1458 | return error("Unable to append to %s", log_file); |
6de08ae6 SP |
1459 | return 0; |
1460 | } | |
1461 | ||
c3b0dec5 LT |
1462 | static int is_branch(const char *refname) |
1463 | { | |
1464 | return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/"); | |
1465 | } | |
1466 | ||
4bd18c43 SP |
1467 | int write_ref_sha1(struct ref_lock *lock, |
1468 | const unsigned char *sha1, const char *logmsg) | |
1469 | { | |
1470 | static char term = '\n'; | |
c3b0dec5 | 1471 | struct object *o; |
4bd18c43 SP |
1472 | |
1473 | if (!lock) | |
95fc7512 | 1474 | return -1; |
a89fccd2 | 1475 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
1476 | unlock_ref(lock); |
1477 | return 0; | |
95fc7512 | 1478 | } |
c3b0dec5 LT |
1479 | o = parse_object(sha1); |
1480 | if (!o) { | |
7be8b3ba | 1481 | error("Trying to write ref %s with nonexistent object %s", |
c3b0dec5 LT |
1482 | lock->ref_name, sha1_to_hex(sha1)); |
1483 | unlock_ref(lock); | |
1484 | return -1; | |
1485 | } | |
1486 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1487 | error("Trying to write non-commit object %s to branch %s", | |
1488 | sha1_to_hex(sha1), lock->ref_name); | |
1489 | unlock_ref(lock); | |
1490 | return -1; | |
1491 | } | |
93822c22 AW |
1492 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
1493 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
b531394d | 1494 | || close_ref(lock) < 0) { |
c33d5174 | 1495 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
1496 | unlock_ref(lock); |
1497 | return -1; | |
1498 | } | |
5e290ff7 | 1499 | invalidate_cached_refs(); |
bd104db1 NP |
1500 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
1501 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
1502 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
1503 | unlock_ref(lock); |
1504 | return -1; | |
1505 | } | |
605fac8b NP |
1506 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
1507 | /* | |
1508 | * Special hack: If a branch is updated directly and HEAD | |
1509 | * points to it (may happen on the remote side of a push | |
1510 | * for example) then logically the HEAD reflog should be | |
1511 | * updated too. | |
1512 | * A generic solution implies reverse symref information, | |
1513 | * but finding all symrefs pointing to the given branch | |
1514 | * would be rather costly for this rare event (the direct | |
1515 | * update of a branch) to be worth it. So let's cheat and | |
1516 | * check with HEAD only which should cover 99% of all usage | |
1517 | * scenarios (even 100% of the default ones). | |
1518 | */ | |
1519 | unsigned char head_sha1[20]; | |
1520 | int head_flag; | |
1521 | const char *head_ref; | |
1522 | head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag); | |
1523 | if (head_ref && (head_flag & REF_ISSYMREF) && | |
1524 | !strcmp(head_ref, lock->ref_name)) | |
1525 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
1526 | } | |
b531394d | 1527 | if (commit_ref(lock)) { |
434cd0cd | 1528 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
1529 | unlock_ref(lock); |
1530 | return -1; | |
1531 | } | |
4bd18c43 SP |
1532 | unlock_ref(lock); |
1533 | return 0; | |
95fc7512 | 1534 | } |
d556fae2 | 1535 | |
8b5157e4 NP |
1536 | int create_symref(const char *ref_target, const char *refs_heads_master, |
1537 | const char *logmsg) | |
41b625b0 NP |
1538 | { |
1539 | const char *lockpath; | |
1540 | char ref[1000]; | |
1541 | int fd, len, written; | |
a4f34cbb | 1542 | char *git_HEAD = git_pathdup("%s", ref_target); |
8b5157e4 NP |
1543 | unsigned char old_sha1[20], new_sha1[20]; |
1544 | ||
1545 | if (logmsg && read_ref(ref_target, old_sha1)) | |
1546 | hashclr(old_sha1); | |
41b625b0 | 1547 | |
d48744d1 JH |
1548 | if (safe_create_leading_directories(git_HEAD) < 0) |
1549 | return error("unable to create directory for %s", git_HEAD); | |
1550 | ||
41b625b0 NP |
1551 | #ifndef NO_SYMLINK_HEAD |
1552 | if (prefer_symlink_refs) { | |
1553 | unlink(git_HEAD); | |
1554 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 1555 | goto done; |
41b625b0 NP |
1556 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
1557 | } | |
1558 | #endif | |
1559 | ||
1560 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
1561 | if (sizeof(ref) <= len) { | |
1562 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 1563 | goto error_free_return; |
41b625b0 NP |
1564 | } |
1565 | lockpath = mkpath("%s.lock", git_HEAD); | |
1566 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
1567 | if (fd < 0) { | |
1568 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 1569 | goto error_free_return; |
41b625b0 NP |
1570 | } |
1571 | written = write_in_full(fd, ref, len); | |
91c8d590 | 1572 | if (close(fd) != 0 || written != len) { |
41b625b0 | 1573 | error("Unable to write to %s", lockpath); |
47fc52e2 | 1574 | goto error_unlink_return; |
41b625b0 NP |
1575 | } |
1576 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 1577 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 1578 | goto error_unlink_return; |
41b625b0 NP |
1579 | } |
1580 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 1581 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 | 1582 | error_unlink_return: |
691f1a28 | 1583 | unlink_or_warn(lockpath); |
47fc52e2 JH |
1584 | error_free_return: |
1585 | free(git_HEAD); | |
1586 | return -1; | |
41b625b0 | 1587 | } |
8b5157e4 | 1588 | |
ee96d11b | 1589 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 1590 | done: |
ee96d11b | 1591 | #endif |
8b5157e4 NP |
1592 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
1593 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
1594 | ||
47fc52e2 | 1595 | free(git_HEAD); |
41b625b0 NP |
1596 | return 0; |
1597 | } | |
1598 | ||
16d7cc90 JH |
1599 | static char *ref_msg(const char *line, const char *endp) |
1600 | { | |
1601 | const char *ep; | |
16d7cc90 | 1602 | line += 82; |
182af834 PH |
1603 | ep = memchr(line, '\n', endp - line); |
1604 | if (!ep) | |
1605 | ep = endp; | |
1606 | return xmemdupz(line, ep - line); | |
16d7cc90 JH |
1607 | } |
1608 | ||
1609 | 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 | 1610 | { |
e5229042 | 1611 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 | 1612 | char *tz_c; |
e29cb53a | 1613 | int logfd, tz, reccnt = 0; |
d556fae2 SP |
1614 | struct stat st; |
1615 | unsigned long date; | |
e5229042 | 1616 | unsigned char logged_sha1[20]; |
cb48cb58 | 1617 | void *log_mapped; |
dc49cd76 | 1618 | size_t mapsz; |
d556fae2 SP |
1619 | |
1620 | logfile = git_path("logs/%s", ref); | |
1621 | logfd = open(logfile, O_RDONLY, 0); | |
1622 | if (logfd < 0) | |
d824cbba | 1623 | die_errno("Unable to read log '%s'", logfile); |
d556fae2 SP |
1624 | fstat(logfd, &st); |
1625 | if (!st.st_size) | |
1626 | die("Log %s is empty.", logfile); | |
dc49cd76 SP |
1627 | mapsz = xsize_t(st.st_size); |
1628 | log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0); | |
cb48cb58 | 1629 | logdata = log_mapped; |
d556fae2 SP |
1630 | close(logfd); |
1631 | ||
e5229042 | 1632 | lastrec = NULL; |
d556fae2 SP |
1633 | rec = logend = logdata + st.st_size; |
1634 | while (logdata < rec) { | |
e29cb53a | 1635 | reccnt++; |
d556fae2 SP |
1636 | if (logdata < rec && *(rec-1) == '\n') |
1637 | rec--; | |
e5229042 SP |
1638 | lastgt = NULL; |
1639 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 1640 | rec--; |
e5229042 SP |
1641 | if (*rec == '>') |
1642 | lastgt = rec; | |
1643 | } | |
1644 | if (!lastgt) | |
d556fae2 | 1645 | die("Log %s is corrupt.", logfile); |
e5229042 | 1646 | date = strtoul(lastgt + 1, &tz_c, 10); |
ab2a1a32 | 1647 | if (date <= at_time || cnt == 0) { |
76a44c5c | 1648 | tz = strtoul(tz_c, NULL, 10); |
16d7cc90 JH |
1649 | if (msg) |
1650 | *msg = ref_msg(rec, logend); | |
1651 | if (cutoff_time) | |
1652 | *cutoff_time = date; | |
1653 | if (cutoff_tz) | |
1654 | *cutoff_tz = tz; | |
1655 | if (cutoff_cnt) | |
76a44c5c | 1656 | *cutoff_cnt = reccnt - 1; |
e5229042 SP |
1657 | if (lastrec) { |
1658 | if (get_sha1_hex(lastrec, logged_sha1)) | |
1659 | die("Log %s is corrupt.", logfile); | |
1660 | if (get_sha1_hex(rec + 41, sha1)) | |
1661 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1662 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1663 | warning("Log %s has gap after %s.", |
73013afd | 1664 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 | 1665 | } |
e5f38ec3 JH |
1666 | } |
1667 | else if (date == at_time) { | |
e5229042 SP |
1668 | if (get_sha1_hex(rec + 41, sha1)) |
1669 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
1670 | } |
1671 | else { | |
e5229042 SP |
1672 | if (get_sha1_hex(rec + 41, logged_sha1)) |
1673 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1674 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1675 | warning("Log %s unexpectedly ended on %s.", |
73013afd | 1676 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 SP |
1677 | } |
1678 | } | |
dc49cd76 | 1679 | munmap(log_mapped, mapsz); |
d556fae2 SP |
1680 | return 0; |
1681 | } | |
e5229042 | 1682 | lastrec = rec; |
ab2a1a32 JH |
1683 | if (cnt > 0) |
1684 | cnt--; | |
d556fae2 SP |
1685 | } |
1686 | ||
e5229042 SP |
1687 | rec = logdata; |
1688 | while (rec < logend && *rec != '>' && *rec != '\n') | |
1689 | rec++; | |
1690 | if (rec == logend || *rec == '\n') | |
d556fae2 | 1691 | die("Log %s is corrupt.", logfile); |
e5229042 | 1692 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
1693 | tz = strtoul(tz_c, NULL, 10); |
1694 | if (get_sha1_hex(logdata, sha1)) | |
1695 | die("Log %s is corrupt.", logfile); | |
d1a4489a JK |
1696 | if (is_null_sha1(sha1)) { |
1697 | if (get_sha1_hex(logdata + 41, sha1)) | |
1698 | die("Log %s is corrupt.", logfile); | |
1699 | } | |
16d7cc90 JH |
1700 | if (msg) |
1701 | *msg = ref_msg(logdata, logend); | |
dc49cd76 | 1702 | munmap(log_mapped, mapsz); |
16d7cc90 JH |
1703 | |
1704 | if (cutoff_time) | |
1705 | *cutoff_time = date; | |
1706 | if (cutoff_tz) | |
1707 | *cutoff_tz = tz; | |
1708 | if (cutoff_cnt) | |
1709 | *cutoff_cnt = reccnt; | |
1710 | return 1; | |
d556fae2 | 1711 | } |
2ff81662 | 1712 | |
101d15e0 | 1713 | int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long ofs, void *cb_data) |
2ff81662 JH |
1714 | { |
1715 | const char *logfile; | |
1716 | FILE *logfp; | |
8ca78803 | 1717 | struct strbuf sb = STRBUF_INIT; |
2266bf27 | 1718 | int ret = 0; |
2ff81662 JH |
1719 | |
1720 | logfile = git_path("logs/%s", ref); | |
1721 | logfp = fopen(logfile, "r"); | |
1722 | if (!logfp) | |
883d60fa | 1723 | return -1; |
101d15e0 JH |
1724 | |
1725 | if (ofs) { | |
1726 | struct stat statbuf; | |
1727 | if (fstat(fileno(logfp), &statbuf) || | |
1728 | statbuf.st_size < ofs || | |
1729 | fseek(logfp, -ofs, SEEK_END) || | |
8ca78803 | 1730 | strbuf_getwholeline(&sb, logfp, '\n')) { |
9d33f7c2 | 1731 | fclose(logfp); |
8ca78803 | 1732 | strbuf_release(&sb); |
101d15e0 | 1733 | return -1; |
9d33f7c2 | 1734 | } |
101d15e0 JH |
1735 | } |
1736 | ||
8ca78803 | 1737 | while (!strbuf_getwholeline(&sb, logfp, '\n')) { |
2ff81662 | 1738 | unsigned char osha1[20], nsha1[20]; |
883d60fa JS |
1739 | char *email_end, *message; |
1740 | unsigned long timestamp; | |
8ca78803 | 1741 | int tz; |
2ff81662 JH |
1742 | |
1743 | /* old SP new SP name <email> SP time TAB msg LF */ | |
8ca78803 RS |
1744 | if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' || |
1745 | get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' || | |
1746 | get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' || | |
1747 | !(email_end = strchr(sb.buf + 82, '>')) || | |
883d60fa JS |
1748 | email_end[1] != ' ' || |
1749 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
1750 | !message || message[0] != ' ' || | |
1751 | (message[1] != '+' && message[1] != '-') || | |
1752 | !isdigit(message[2]) || !isdigit(message[3]) || | |
b4dd4856 | 1753 | !isdigit(message[4]) || !isdigit(message[5])) |
2ff81662 | 1754 | continue; /* corrupt? */ |
883d60fa JS |
1755 | email_end[1] = '\0'; |
1756 | tz = strtol(message + 1, NULL, 10); | |
b4dd4856 JS |
1757 | if (message[6] != '\t') |
1758 | message += 6; | |
1759 | else | |
1760 | message += 7; | |
8ca78803 RS |
1761 | ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message, |
1762 | cb_data); | |
883d60fa | 1763 | if (ret) |
2266bf27 | 1764 | break; |
2ff81662 JH |
1765 | } |
1766 | fclose(logfp); | |
8ca78803 | 1767 | strbuf_release(&sb); |
2266bf27 | 1768 | return ret; |
2ff81662 | 1769 | } |
e29cb53a | 1770 | |
101d15e0 JH |
1771 | int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data) |
1772 | { | |
1773 | return for_each_recent_reflog_ent(ref, fn, 0, cb_data); | |
1774 | } | |
1775 | ||
eb8381c8 NP |
1776 | static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data) |
1777 | { | |
1778 | DIR *dir = opendir(git_path("logs/%s", base)); | |
fcee5a14 | 1779 | int retval = 0; |
eb8381c8 NP |
1780 | |
1781 | if (dir) { | |
1782 | struct dirent *de; | |
1783 | int baselen = strlen(base); | |
1784 | char *log = xmalloc(baselen + 257); | |
1785 | ||
1786 | memcpy(log, base, baselen); | |
1787 | if (baselen && base[baselen-1] != '/') | |
1788 | log[baselen++] = '/'; | |
1789 | ||
1790 | while ((de = readdir(dir)) != NULL) { | |
1791 | struct stat st; | |
1792 | int namelen; | |
1793 | ||
1794 | if (de->d_name[0] == '.') | |
1795 | continue; | |
1796 | namelen = strlen(de->d_name); | |
1797 | if (namelen > 255) | |
1798 | continue; | |
1799 | if (has_extension(de->d_name, ".lock")) | |
1800 | continue; | |
1801 | memcpy(log + baselen, de->d_name, namelen+1); | |
1802 | if (stat(git_path("logs/%s", log), &st) < 0) | |
1803 | continue; | |
1804 | if (S_ISDIR(st.st_mode)) { | |
1805 | retval = do_for_each_reflog(log, fn, cb_data); | |
1806 | } else { | |
1807 | unsigned char sha1[20]; | |
1808 | if (!resolve_ref(log, sha1, 0, NULL)) | |
1809 | retval = error("bad ref for %s", log); | |
1810 | else | |
1811 | retval = fn(log, sha1, 0, cb_data); | |
1812 | } | |
1813 | if (retval) | |
1814 | break; | |
1815 | } | |
1816 | free(log); | |
1817 | closedir(dir); | |
1818 | } | |
acb39f64 | 1819 | else if (*base) |
fcee5a14 | 1820 | return errno; |
eb8381c8 NP |
1821 | return retval; |
1822 | } | |
1823 | ||
1824 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
1825 | { | |
1826 | return do_for_each_reflog("", fn, cb_data); | |
1827 | } | |
3d9f037c CR |
1828 | |
1829 | int update_ref(const char *action, const char *refname, | |
1830 | const unsigned char *sha1, const unsigned char *oldval, | |
1831 | int flags, enum action_on_err onerr) | |
1832 | { | |
1833 | static struct ref_lock *lock; | |
1834 | lock = lock_any_ref_for_update(refname, oldval, flags); | |
1835 | if (!lock) { | |
1836 | const char *str = "Cannot lock the ref '%s'."; | |
1837 | switch (onerr) { | |
1838 | case MSG_ON_ERR: error(str, refname); break; | |
1839 | case DIE_ON_ERR: die(str, refname); break; | |
1840 | case QUIET_ON_ERR: break; | |
1841 | } | |
1842 | return 1; | |
1843 | } | |
1844 | if (write_ref_sha1(lock, sha1, action) < 0) { | |
1845 | const char *str = "Cannot update the ref '%s'."; | |
1846 | switch (onerr) { | |
1847 | case MSG_ON_ERR: error(str, refname); break; | |
1848 | case DIE_ON_ERR: die(str, refname); break; | |
1849 | case QUIET_ON_ERR: break; | |
1850 | } | |
1851 | return 1; | |
1852 | } | |
1853 | return 0; | |
1854 | } | |
cda69f48 | 1855 | |
c17b2294 JH |
1856 | int ref_exists(char *refname) |
1857 | { | |
1858 | unsigned char sha1[20]; | |
1859 | return !!resolve_ref(refname, sha1, 1, NULL); | |
1860 | } | |
1861 | ||
5483f799 | 1862 | struct ref *find_ref_by_name(const struct ref *list, const char *name) |
cda69f48 JK |
1863 | { |
1864 | for ( ; list; list = list->next) | |
1865 | if (!strcmp(list->name, name)) | |
5483f799 | 1866 | return (struct ref *)list; |
cda69f48 JK |
1867 | return NULL; |
1868 | } | |
7c2b3029 JK |
1869 | |
1870 | /* | |
1871 | * generate a format suitable for scanf from a ref_rev_parse_rules | |
1872 | * rule, that is replace the "%.*s" spec with a "%s" spec | |
1873 | */ | |
1874 | static void gen_scanf_fmt(char *scanf_fmt, const char *rule) | |
1875 | { | |
1876 | char *spec; | |
1877 | ||
1878 | spec = strstr(rule, "%.*s"); | |
1879 | if (!spec || strstr(spec + 4, "%.*s")) | |
1880 | die("invalid rule in ref_rev_parse_rules: %s", rule); | |
1881 | ||
1882 | /* copy all until spec */ | |
1883 | strncpy(scanf_fmt, rule, spec - rule); | |
1884 | scanf_fmt[spec - rule] = '\0'; | |
1885 | /* copy new spec */ | |
1886 | strcat(scanf_fmt, "%s"); | |
1887 | /* copy remaining rule */ | |
1888 | strcat(scanf_fmt, spec + 4); | |
1889 | ||
1890 | return; | |
1891 | } | |
1892 | ||
6e7b3309 | 1893 | char *shorten_unambiguous_ref(const char *ref, int strict) |
7c2b3029 JK |
1894 | { |
1895 | int i; | |
1896 | static char **scanf_fmts; | |
1897 | static int nr_rules; | |
1898 | char *short_name; | |
1899 | ||
1900 | /* pre generate scanf formats from ref_rev_parse_rules[] */ | |
1901 | if (!nr_rules) { | |
1902 | size_t total_len = 0; | |
1903 | ||
1904 | /* the rule list is NULL terminated, count them first */ | |
1905 | for (; ref_rev_parse_rules[nr_rules]; nr_rules++) | |
1906 | /* no +1 because strlen("%s") < strlen("%.*s") */ | |
1907 | total_len += strlen(ref_rev_parse_rules[nr_rules]); | |
1908 | ||
1909 | scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len); | |
1910 | ||
1911 | total_len = 0; | |
1912 | for (i = 0; i < nr_rules; i++) { | |
1913 | scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] | |
1914 | + total_len; | |
1915 | gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]); | |
1916 | total_len += strlen(ref_rev_parse_rules[i]); | |
1917 | } | |
1918 | } | |
1919 | ||
1920 | /* bail out if there are no rules */ | |
1921 | if (!nr_rules) | |
1922 | return xstrdup(ref); | |
1923 | ||
1924 | /* buffer for scanf result, at most ref must fit */ | |
1925 | short_name = xstrdup(ref); | |
1926 | ||
1927 | /* skip first rule, it will always match */ | |
1928 | for (i = nr_rules - 1; i > 0 ; --i) { | |
1929 | int j; | |
6e7b3309 | 1930 | int rules_to_fail = i; |
7c2b3029 JK |
1931 | int short_name_len; |
1932 | ||
1933 | if (1 != sscanf(ref, scanf_fmts[i], short_name)) | |
1934 | continue; | |
1935 | ||
1936 | short_name_len = strlen(short_name); | |
1937 | ||
6e7b3309 BW |
1938 | /* |
1939 | * in strict mode, all (except the matched one) rules | |
1940 | * must fail to resolve to a valid non-ambiguous ref | |
1941 | */ | |
1942 | if (strict) | |
1943 | rules_to_fail = nr_rules; | |
1944 | ||
7c2b3029 JK |
1945 | /* |
1946 | * check if the short name resolves to a valid ref, | |
1947 | * but use only rules prior to the matched one | |
1948 | */ | |
6e7b3309 | 1949 | for (j = 0; j < rules_to_fail; j++) { |
7c2b3029 JK |
1950 | const char *rule = ref_rev_parse_rules[j]; |
1951 | unsigned char short_objectname[20]; | |
1952 | char refname[PATH_MAX]; | |
1953 | ||
6e7b3309 BW |
1954 | /* skip matched rule */ |
1955 | if (i == j) | |
1956 | continue; | |
1957 | ||
7c2b3029 JK |
1958 | /* |
1959 | * the short name is ambiguous, if it resolves | |
1960 | * (with this previous rule) to a valid ref | |
1961 | * read_ref() returns 0 on success | |
1962 | */ | |
1963 | mksnpath(refname, sizeof(refname), | |
1964 | rule, short_name_len, short_name); | |
1965 | if (!read_ref(refname, short_objectname)) | |
1966 | break; | |
1967 | } | |
1968 | ||
1969 | /* | |
1970 | * short name is non-ambiguous if all previous rules | |
1971 | * haven't resolved to a valid ref | |
1972 | */ | |
6e7b3309 | 1973 | if (j == rules_to_fail) |
7c2b3029 JK |
1974 | return short_name; |
1975 | } | |
1976 | ||
1977 | free(short_name); | |
1978 | return xstrdup(ref); | |
1979 | } |