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Commit | Line | Data |
---|---|---|
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 | |
9 | ||
e1e22e37 LT |
10 | struct ref_list { |
11 | struct ref_list *next; | |
f4204ab9 | 12 | unsigned char flag; /* ISSYMREF? ISPACKED? */ |
e1e22e37 | 13 | unsigned char sha1[20]; |
f4204ab9 | 14 | unsigned char peeled[20]; |
e1e22e37 LT |
15 | char name[FLEX_ARRAY]; |
16 | }; | |
17 | ||
f4204ab9 | 18 | static const char *parse_ref_line(char *line, unsigned char *sha1) |
e1e22e37 LT |
19 | { |
20 | /* | |
21 | * 42: the answer to everything. | |
22 | * | |
23 | * In this case, it happens to be the answer to | |
24 | * 40 (length of sha1 hex representation) | |
25 | * +1 (space in between hex and name) | |
26 | * +1 (newline at the end of the line) | |
27 | */ | |
28 | int len = strlen(line) - 42; | |
29 | ||
30 | if (len <= 0) | |
31 | return NULL; | |
32 | if (get_sha1_hex(line, sha1) < 0) | |
33 | return NULL; | |
34 | if (!isspace(line[40])) | |
35 | return NULL; | |
36 | line += 41; | |
f4204ab9 JH |
37 | if (isspace(*line)) |
38 | return NULL; | |
e1e22e37 LT |
39 | if (line[len] != '\n') |
40 | return NULL; | |
41 | line[len] = 0; | |
cf0adba7 | 42 | |
e1e22e37 LT |
43 | return line; |
44 | } | |
45 | ||
8da19775 | 46 | static struct ref_list *add_ref(const char *name, const unsigned char *sha1, |
f4204ab9 JH |
47 | int flag, struct ref_list *list, |
48 | struct ref_list **new_entry) | |
e1e22e37 LT |
49 | { |
50 | int len; | |
c774aab9 | 51 | struct ref_list *entry; |
e1e22e37 LT |
52 | |
53 | /* Allocate it and add it in.. */ | |
54 | len = strlen(name) + 1; | |
55 | entry = xmalloc(sizeof(struct ref_list) + len); | |
56 | hashcpy(entry->sha1, sha1); | |
f4204ab9 | 57 | hashclr(entry->peeled); |
e1e22e37 | 58 | memcpy(entry->name, name, len); |
8da19775 | 59 | entry->flag = flag; |
c774aab9 | 60 | entry->next = list; |
f4204ab9 JH |
61 | if (new_entry) |
62 | *new_entry = entry; | |
c774aab9 JP |
63 | return entry; |
64 | } | |
65 | ||
66 | /* merge sort the ref list */ | |
67 | static struct ref_list *sort_ref_list(struct ref_list *list) | |
68 | { | |
69 | int psize, qsize, last_merge_count, cmp; | |
70 | struct ref_list *p, *q, *l, *e; | |
71 | struct ref_list *new_list = list; | |
72 | int k = 1; | |
73 | int merge_count = 0; | |
74 | ||
75 | if (!list) | |
76 | return list; | |
77 | ||
78 | do { | |
79 | last_merge_count = merge_count; | |
80 | merge_count = 0; | |
81 | ||
82 | psize = 0; | |
83 | ||
84 | p = new_list; | |
85 | q = new_list; | |
86 | new_list = NULL; | |
87 | l = NULL; | |
88 | ||
89 | while (p) { | |
90 | merge_count++; | |
91 | ||
92 | while (psize < k && q->next) { | |
93 | q = q->next; | |
94 | psize++; | |
95 | } | |
96 | qsize = k; | |
97 | ||
98 | while ((psize > 0) || (qsize > 0 && q)) { | |
99 | if (qsize == 0 || !q) { | |
100 | e = p; | |
101 | p = p->next; | |
102 | psize--; | |
103 | } else if (psize == 0) { | |
104 | e = q; | |
105 | q = q->next; | |
106 | qsize--; | |
107 | } else { | |
108 | cmp = strcmp(q->name, p->name); | |
109 | if (cmp < 0) { | |
110 | e = q; | |
111 | q = q->next; | |
112 | qsize--; | |
113 | } else if (cmp > 0) { | |
114 | e = p; | |
115 | p = p->next; | |
116 | psize--; | |
117 | } else { | |
118 | if (hashcmp(q->sha1, p->sha1)) | |
119 | die("Duplicated ref, and SHA1s don't match: %s", | |
120 | q->name); | |
121 | warning("Duplicated ref: %s", q->name); | |
122 | e = q; | |
123 | q = q->next; | |
124 | qsize--; | |
125 | free(e); | |
126 | e = p; | |
127 | p = p->next; | |
128 | psize--; | |
129 | } | |
130 | } | |
131 | ||
132 | e->next = NULL; | |
133 | ||
134 | if (l) | |
135 | l->next = e; | |
136 | if (!new_list) | |
137 | new_list = e; | |
138 | l = e; | |
139 | } | |
140 | ||
141 | p = q; | |
142 | }; | |
143 | ||
144 | k = k * 2; | |
145 | } while ((last_merge_count != merge_count) || (last_merge_count != 1)); | |
146 | ||
147 | return new_list; | |
e1e22e37 LT |
148 | } |
149 | ||
5e290ff7 JH |
150 | /* |
151 | * Future: need to be in "struct repository" | |
152 | * when doing a full libification. | |
153 | */ | |
4175e9e3 | 154 | static struct cached_refs { |
5e290ff7 JH |
155 | char did_loose; |
156 | char did_packed; | |
157 | struct ref_list *loose; | |
158 | struct ref_list *packed; | |
159 | } cached_refs; | |
0ae91be0 | 160 | static struct ref_list *current_ref; |
5e290ff7 JH |
161 | |
162 | static void free_ref_list(struct ref_list *list) | |
163 | { | |
164 | struct ref_list *next; | |
165 | for ( ; list; list = next) { | |
166 | next = list->next; | |
167 | free(list); | |
168 | } | |
169 | } | |
170 | ||
171 | static void invalidate_cached_refs(void) | |
e1e22e37 | 172 | { |
5e290ff7 JH |
173 | struct cached_refs *ca = &cached_refs; |
174 | ||
175 | if (ca->did_loose && ca->loose) | |
176 | free_ref_list(ca->loose); | |
177 | if (ca->did_packed && ca->packed) | |
178 | free_ref_list(ca->packed); | |
179 | ca->loose = ca->packed = NULL; | |
180 | ca->did_loose = ca->did_packed = 0; | |
181 | } | |
e1e22e37 | 182 | |
f4204ab9 JH |
183 | static void read_packed_refs(FILE *f, struct cached_refs *cached_refs) |
184 | { | |
185 | struct ref_list *list = NULL; | |
186 | struct ref_list *last = NULL; | |
187 | char refline[PATH_MAX]; | |
188 | int flag = REF_ISPACKED; | |
189 | ||
190 | while (fgets(refline, sizeof(refline), f)) { | |
191 | unsigned char sha1[20]; | |
192 | const char *name; | |
193 | static const char header[] = "# pack-refs with:"; | |
194 | ||
195 | if (!strncmp(refline, header, sizeof(header)-1)) { | |
196 | const char *traits = refline + sizeof(header) - 1; | |
197 | if (strstr(traits, " peeled ")) | |
198 | flag |= REF_KNOWS_PEELED; | |
199 | /* perhaps other traits later as well */ | |
200 | continue; | |
201 | } | |
202 | ||
203 | name = parse_ref_line(refline, sha1); | |
204 | if (name) { | |
205 | list = add_ref(name, sha1, flag, list, &last); | |
206 | continue; | |
207 | } | |
208 | if (last && | |
209 | refline[0] == '^' && | |
210 | strlen(refline) == 42 && | |
211 | refline[41] == '\n' && | |
212 | !get_sha1_hex(refline + 1, sha1)) | |
213 | hashcpy(last->peeled, sha1); | |
214 | } | |
c774aab9 | 215 | cached_refs->packed = sort_ref_list(list); |
f4204ab9 JH |
216 | } |
217 | ||
5e290ff7 JH |
218 | static struct ref_list *get_packed_refs(void) |
219 | { | |
220 | if (!cached_refs.did_packed) { | |
e1e22e37 | 221 | FILE *f = fopen(git_path("packed-refs"), "r"); |
f4204ab9 | 222 | cached_refs.packed = NULL; |
e1e22e37 | 223 | if (f) { |
f4204ab9 | 224 | read_packed_refs(f, &cached_refs); |
e1e22e37 | 225 | fclose(f); |
e1e22e37 | 226 | } |
5e290ff7 | 227 | cached_refs.did_packed = 1; |
e1e22e37 | 228 | } |
5e290ff7 | 229 | return cached_refs.packed; |
e1e22e37 LT |
230 | } |
231 | ||
232 | static struct ref_list *get_ref_dir(const char *base, struct ref_list *list) | |
233 | { | |
234 | DIR *dir = opendir(git_path("%s", base)); | |
235 | ||
236 | if (dir) { | |
237 | struct dirent *de; | |
238 | int baselen = strlen(base); | |
ed378ec7 | 239 | char *ref = xmalloc(baselen + 257); |
e1e22e37 | 240 | |
ed378ec7 | 241 | memcpy(ref, base, baselen); |
e1e22e37 | 242 | if (baselen && base[baselen-1] != '/') |
ed378ec7 | 243 | ref[baselen++] = '/'; |
e1e22e37 LT |
244 | |
245 | while ((de = readdir(dir)) != NULL) { | |
246 | unsigned char sha1[20]; | |
247 | struct stat st; | |
8da19775 | 248 | int flag; |
e1e22e37 LT |
249 | int namelen; |
250 | ||
251 | if (de->d_name[0] == '.') | |
252 | continue; | |
253 | namelen = strlen(de->d_name); | |
254 | if (namelen > 255) | |
255 | continue; | |
256 | if (has_extension(de->d_name, ".lock")) | |
257 | continue; | |
ed378ec7 LT |
258 | memcpy(ref + baselen, de->d_name, namelen+1); |
259 | if (stat(git_path("%s", ref), &st) < 0) | |
e1e22e37 LT |
260 | continue; |
261 | if (S_ISDIR(st.st_mode)) { | |
ed378ec7 | 262 | list = get_ref_dir(ref, list); |
e1e22e37 LT |
263 | continue; |
264 | } | |
8da19775 | 265 | if (!resolve_ref(ref, sha1, 1, &flag)) { |
ed378ec7 | 266 | error("%s points nowhere!", ref); |
e1e22e37 LT |
267 | continue; |
268 | } | |
f4204ab9 | 269 | list = add_ref(ref, sha1, flag, list, NULL); |
e1e22e37 | 270 | } |
ed378ec7 | 271 | free(ref); |
e1e22e37 LT |
272 | closedir(dir); |
273 | } | |
c774aab9 | 274 | return sort_ref_list(list); |
e1e22e37 LT |
275 | } |
276 | ||
277 | static struct ref_list *get_loose_refs(void) | |
278 | { | |
5e290ff7 JH |
279 | if (!cached_refs.did_loose) { |
280 | cached_refs.loose = get_ref_dir("refs", NULL); | |
281 | cached_refs.did_loose = 1; | |
e1e22e37 | 282 | } |
5e290ff7 | 283 | return cached_refs.loose; |
e1e22e37 LT |
284 | } |
285 | ||
ca8db142 LT |
286 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
287 | #define MAXDEPTH 5 | |
0ebde32c LT |
288 | #define MAXREFLEN (1024) |
289 | ||
290 | static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result) | |
291 | { | |
292 | FILE *f; | |
293 | struct cached_refs refs; | |
294 | struct ref_list *ref; | |
295 | int retval; | |
296 | ||
297 | strcpy(name + pathlen, "packed-refs"); | |
298 | f = fopen(name, "r"); | |
299 | if (!f) | |
300 | return -1; | |
301 | read_packed_refs(f, &refs); | |
302 | fclose(f); | |
303 | ref = refs.packed; | |
304 | retval = -1; | |
305 | while (ref) { | |
306 | if (!strcmp(ref->name, refname)) { | |
307 | retval = 0; | |
308 | memcpy(result, ref->sha1, 20); | |
309 | break; | |
310 | } | |
311 | ref = ref->next; | |
312 | } | |
313 | free_ref_list(refs.packed); | |
314 | return retval; | |
315 | } | |
316 | ||
317 | static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion) | |
318 | { | |
319 | int fd, len = strlen(refname); | |
320 | char buffer[128], *p; | |
321 | ||
322 | if (recursion > MAXDEPTH || len > MAXREFLEN) | |
323 | return -1; | |
324 | memcpy(name + pathlen, refname, len+1); | |
325 | fd = open(name, O_RDONLY); | |
326 | if (fd < 0) | |
327 | return resolve_gitlink_packed_ref(name, pathlen, refname, result); | |
328 | ||
329 | len = read(fd, buffer, sizeof(buffer)-1); | |
330 | close(fd); | |
331 | if (len < 0) | |
332 | return -1; | |
333 | while (len && isspace(buffer[len-1])) | |
334 | len--; | |
335 | buffer[len] = 0; | |
336 | ||
337 | /* Was it a detached head or an old-fashioned symlink? */ | |
338 | if (!get_sha1_hex(buffer, result)) | |
339 | return 0; | |
340 | ||
341 | /* Symref? */ | |
342 | if (strncmp(buffer, "ref:", 4)) | |
343 | return -1; | |
344 | p = buffer + 4; | |
345 | while (isspace(*p)) | |
346 | p++; | |
347 | ||
348 | return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1); | |
349 | } | |
350 | ||
351 | int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result) | |
352 | { | |
353 | int len = strlen(path), retval; | |
354 | char *gitdir; | |
355 | ||
356 | while (len && path[len-1] == '/') | |
357 | len--; | |
358 | if (!len) | |
359 | return -1; | |
360 | gitdir = xmalloc(len + MAXREFLEN + 8); | |
361 | memcpy(gitdir, path, len); | |
362 | memcpy(gitdir + len, "/.git/", 7); | |
363 | ||
364 | retval = resolve_gitlink_ref_recursive(gitdir, len+6, refname, result, 0); | |
365 | free(gitdir); | |
366 | return retval; | |
367 | } | |
ca8db142 | 368 | |
8da19775 | 369 | const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 370 | { |
a876ed83 JH |
371 | int depth = MAXDEPTH, len; |
372 | char buffer[256]; | |
ed378ec7 | 373 | static char ref_buffer[256]; |
ca8db142 | 374 | |
8da19775 JH |
375 | if (flag) |
376 | *flag = 0; | |
377 | ||
a876ed83 | 378 | for (;;) { |
ed378ec7 | 379 | const char *path = git_path("%s", ref); |
a876ed83 JH |
380 | struct stat st; |
381 | char *buf; | |
382 | int fd; | |
8a65ff76 | 383 | |
a876ed83 JH |
384 | if (--depth < 0) |
385 | return NULL; | |
ca8db142 | 386 | |
a876ed83 JH |
387 | /* Special case: non-existing file. |
388 | * Not having the refs/heads/new-branch is OK | |
389 | * if we are writing into it, so is .git/HEAD | |
390 | * that points at refs/heads/master still to be | |
391 | * born. It is NOT OK if we are resolving for | |
392 | * reading. | |
393 | */ | |
394 | if (lstat(path, &st) < 0) { | |
434cd0cd LT |
395 | struct ref_list *list = get_packed_refs(); |
396 | while (list) { | |
f4204ab9 | 397 | if (!strcmp(ref, list->name)) { |
434cd0cd | 398 | hashcpy(sha1, list->sha1); |
8da19775 JH |
399 | if (flag) |
400 | *flag |= REF_ISPACKED; | |
434cd0cd LT |
401 | return ref; |
402 | } | |
403 | list = list->next; | |
404 | } | |
a876ed83 JH |
405 | if (reading || errno != ENOENT) |
406 | return NULL; | |
e702496e | 407 | hashclr(sha1); |
ed378ec7 | 408 | return ref; |
a876ed83 | 409 | } |
ca8db142 | 410 | |
a876ed83 JH |
411 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
412 | if (S_ISLNK(st.st_mode)) { | |
413 | len = readlink(path, buffer, sizeof(buffer)-1); | |
414 | if (len >= 5 && !memcmp("refs/", buffer, 5)) { | |
ed378ec7 LT |
415 | buffer[len] = 0; |
416 | strcpy(ref_buffer, buffer); | |
417 | ref = ref_buffer; | |
8da19775 JH |
418 | if (flag) |
419 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
420 | continue; |
421 | } | |
ca8db142 | 422 | } |
a876ed83 | 423 | |
7a21632f DS |
424 | /* Is it a directory? */ |
425 | if (S_ISDIR(st.st_mode)) { | |
426 | errno = EISDIR; | |
427 | return NULL; | |
428 | } | |
429 | ||
a876ed83 JH |
430 | /* |
431 | * Anything else, just open it and try to use it as | |
432 | * a ref | |
433 | */ | |
434 | fd = open(path, O_RDONLY); | |
435 | if (fd < 0) | |
436 | return NULL; | |
93d26e4c | 437 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
a876ed83 JH |
438 | close(fd); |
439 | ||
440 | /* | |
441 | * Is it a symbolic ref? | |
442 | */ | |
443 | if (len < 4 || memcmp("ref:", buffer, 4)) | |
444 | break; | |
445 | buf = buffer + 4; | |
446 | len -= 4; | |
447 | while (len && isspace(*buf)) | |
448 | buf++, len--; | |
449 | while (len && isspace(buf[len-1])) | |
ed378ec7 LT |
450 | len--; |
451 | buf[len] = 0; | |
452 | memcpy(ref_buffer, buf, len + 1); | |
453 | ref = ref_buffer; | |
8da19775 JH |
454 | if (flag) |
455 | *flag |= REF_ISSYMREF; | |
8a65ff76 | 456 | } |
a876ed83 JH |
457 | if (len < 40 || get_sha1_hex(buffer, sha1)) |
458 | return NULL; | |
ed378ec7 | 459 | return ref; |
a876ed83 JH |
460 | } |
461 | ||
ed378ec7 | 462 | int read_ref(const char *ref, unsigned char *sha1) |
a876ed83 | 463 | { |
8da19775 | 464 | if (resolve_ref(ref, sha1, 1, NULL)) |
a876ed83 JH |
465 | return 0; |
466 | return -1; | |
8a65ff76 LT |
467 | } |
468 | ||
ef06b918 JH |
469 | static int do_one_ref(const char *base, each_ref_fn fn, int trim, |
470 | void *cb_data, struct ref_list *entry) | |
471 | { | |
472 | if (strncmp(base, entry->name, trim)) | |
473 | return 0; | |
474 | if (is_null_sha1(entry->sha1)) | |
475 | return 0; | |
476 | if (!has_sha1_file(entry->sha1)) { | |
477 | error("%s does not point to a valid object!", entry->name); | |
478 | return 0; | |
479 | } | |
0ae91be0 | 480 | current_ref = entry; |
ef06b918 JH |
481 | return fn(entry->name + trim, entry->sha1, entry->flag, cb_data); |
482 | } | |
483 | ||
cf0adba7 JH |
484 | int peel_ref(const char *ref, unsigned char *sha1) |
485 | { | |
486 | int flag; | |
487 | unsigned char base[20]; | |
488 | struct object *o; | |
489 | ||
0ae91be0 SP |
490 | if (current_ref && (current_ref->name == ref |
491 | || !strcmp(current_ref->name, ref))) { | |
492 | if (current_ref->flag & REF_KNOWS_PEELED) { | |
493 | hashcpy(sha1, current_ref->peeled); | |
494 | return 0; | |
495 | } | |
496 | hashcpy(base, current_ref->sha1); | |
497 | goto fallback; | |
498 | } | |
499 | ||
cf0adba7 JH |
500 | if (!resolve_ref(ref, base, 1, &flag)) |
501 | return -1; | |
502 | ||
503 | if ((flag & REF_ISPACKED)) { | |
504 | struct ref_list *list = get_packed_refs(); | |
cf0adba7 JH |
505 | |
506 | while (list) { | |
f4204ab9 JH |
507 | if (!strcmp(list->name, ref)) { |
508 | if (list->flag & REF_KNOWS_PEELED) { | |
509 | hashcpy(sha1, list->peeled); | |
510 | return 0; | |
511 | } | |
512 | /* older pack-refs did not leave peeled ones */ | |
513 | break; | |
cf0adba7 JH |
514 | } |
515 | list = list->next; | |
516 | } | |
cf0adba7 JH |
517 | } |
518 | ||
0ae91be0 | 519 | fallback: |
cf0adba7 | 520 | o = parse_object(base); |
8c87dc77 | 521 | if (o && o->type == OBJ_TAG) { |
cf0adba7 JH |
522 | o = deref_tag(o, ref, 0); |
523 | if (o) { | |
524 | hashcpy(sha1, o->sha1); | |
525 | return 0; | |
526 | } | |
527 | } | |
528 | return -1; | |
529 | } | |
530 | ||
8da19775 JH |
531 | static int do_for_each_ref(const char *base, each_ref_fn fn, int trim, |
532 | void *cb_data) | |
8a65ff76 | 533 | { |
0ae91be0 | 534 | int retval = 0; |
e1e22e37 LT |
535 | struct ref_list *packed = get_packed_refs(); |
536 | struct ref_list *loose = get_loose_refs(); | |
8a65ff76 | 537 | |
e1e22e37 LT |
538 | while (packed && loose) { |
539 | struct ref_list *entry; | |
540 | int cmp = strcmp(packed->name, loose->name); | |
541 | if (!cmp) { | |
542 | packed = packed->next; | |
543 | continue; | |
6cada6a9 | 544 | } |
e1e22e37 LT |
545 | if (cmp > 0) { |
546 | entry = loose; | |
547 | loose = loose->next; | |
548 | } else { | |
549 | entry = packed; | |
550 | packed = packed->next; | |
551 | } | |
ef06b918 | 552 | retval = do_one_ref(base, fn, trim, cb_data, entry); |
e1e22e37 | 553 | if (retval) |
0ae91be0 | 554 | goto end_each; |
e1e22e37 | 555 | } |
8a65ff76 | 556 | |
ef06b918 JH |
557 | for (packed = packed ? packed : loose; packed; packed = packed->next) { |
558 | retval = do_one_ref(base, fn, trim, cb_data, packed); | |
559 | if (retval) | |
0ae91be0 | 560 | goto end_each; |
8a65ff76 | 561 | } |
0ae91be0 SP |
562 | |
563 | end_each: | |
564 | current_ref = NULL; | |
565 | return retval; | |
8a65ff76 LT |
566 | } |
567 | ||
cb5d709f | 568 | int head_ref(each_ref_fn fn, void *cb_data) |
723c31fe LT |
569 | { |
570 | unsigned char sha1[20]; | |
8da19775 JH |
571 | int flag; |
572 | ||
573 | if (resolve_ref("HEAD", sha1, 1, &flag)) | |
574 | return fn("HEAD", sha1, flag, cb_data); | |
2f34ba32 | 575 | return 0; |
723c31fe LT |
576 | } |
577 | ||
cb5d709f | 578 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 579 | { |
cb5d709f | 580 | return do_for_each_ref("refs/", fn, 0, cb_data); |
a62be77f SE |
581 | } |
582 | ||
cb5d709f | 583 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 584 | { |
cb5d709f | 585 | return do_for_each_ref("refs/tags/", fn, 10, cb_data); |
a62be77f SE |
586 | } |
587 | ||
cb5d709f | 588 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 589 | { |
cb5d709f | 590 | return do_for_each_ref("refs/heads/", fn, 11, cb_data); |
a62be77f SE |
591 | } |
592 | ||
cb5d709f | 593 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 594 | { |
cb5d709f | 595 | return do_for_each_ref("refs/remotes/", fn, 13, cb_data); |
8a65ff76 LT |
596 | } |
597 | ||
03feddd6 JH |
598 | /* |
599 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
600 | * We do not like it if: | |
601 | * | |
602 | * - any path component of it begins with ".", or | |
603 | * - it has double dots "..", or | |
604 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
605 | * - it ends with a "/". | |
606 | */ | |
607 | ||
608 | static inline int bad_ref_char(int ch) | |
609 | { | |
8558fd9e DB |
610 | if (((unsigned) ch) <= ' ' || |
611 | ch == '~' || ch == '^' || ch == ':') | |
612 | return 1; | |
613 | /* 2.13 Pattern Matching Notation */ | |
614 | if (ch == '?' || ch == '[') /* Unsupported */ | |
615 | return 1; | |
616 | if (ch == '*') /* Supported at the end */ | |
617 | return 2; | |
618 | return 0; | |
03feddd6 JH |
619 | } |
620 | ||
95fc7512 DB |
621 | int check_ref_format(const char *ref) |
622 | { | |
8558fd9e | 623 | int ch, level, bad_type; |
03feddd6 JH |
624 | const char *cp = ref; |
625 | ||
626 | level = 0; | |
627 | while (1) { | |
628 | while ((ch = *cp++) == '/') | |
629 | ; /* tolerate duplicated slashes */ | |
630 | if (!ch) | |
5f7b202a JH |
631 | /* should not end with slashes */ |
632 | return CHECK_REF_FORMAT_ERROR; | |
03feddd6 JH |
633 | |
634 | /* we are at the beginning of the path component */ | |
8558fd9e | 635 | if (ch == '.') |
5f7b202a | 636 | return CHECK_REF_FORMAT_ERROR; |
8558fd9e DB |
637 | bad_type = bad_ref_char(ch); |
638 | if (bad_type) { | |
5f7b202a JH |
639 | return (bad_type == 2 && !*cp) |
640 | ? CHECK_REF_FORMAT_WILDCARD | |
641 | : CHECK_REF_FORMAT_ERROR; | |
8558fd9e | 642 | } |
03feddd6 JH |
643 | |
644 | /* scan the rest of the path component */ | |
645 | while ((ch = *cp++) != 0) { | |
8558fd9e DB |
646 | bad_type = bad_ref_char(ch); |
647 | if (bad_type) { | |
5f7b202a JH |
648 | return (bad_type == 2 && !*cp) |
649 | ? CHECK_REF_FORMAT_WILDCARD | |
650 | : CHECK_REF_FORMAT_ERROR; | |
8558fd9e | 651 | } |
03feddd6 JH |
652 | if (ch == '/') |
653 | break; | |
654 | if (ch == '.' && *cp == '.') | |
5f7b202a | 655 | return CHECK_REF_FORMAT_ERROR; |
03feddd6 JH |
656 | } |
657 | level++; | |
658 | if (!ch) { | |
659 | if (level < 2) | |
5f7b202a JH |
660 | return CHECK_REF_FORMAT_ONELEVEL; |
661 | return CHECK_REF_FORMAT_OK; | |
03feddd6 JH |
662 | } |
663 | } | |
95fc7512 DB |
664 | } |
665 | ||
79803322 SP |
666 | const char *ref_rev_parse_rules[] = { |
667 | "%.*s", | |
668 | "refs/%.*s", | |
669 | "refs/tags/%.*s", | |
670 | "refs/heads/%.*s", | |
671 | "refs/remotes/%.*s", | |
672 | "refs/remotes/%.*s/HEAD", | |
673 | NULL | |
674 | }; | |
675 | ||
605b4978 SP |
676 | const char *ref_fetch_rules[] = { |
677 | "%.*s", | |
678 | "refs/%.*s", | |
679 | "refs/heads/%.*s", | |
680 | NULL | |
681 | }; | |
682 | ||
79803322 SP |
683 | int refname_match(const char *abbrev_name, const char *full_name, const char **rules) |
684 | { | |
685 | const char **p; | |
686 | const int abbrev_name_len = strlen(abbrev_name); | |
687 | ||
688 | for (p = rules; *p; p++) { | |
689 | if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { | |
690 | return 1; | |
691 | } | |
692 | } | |
693 | ||
694 | return 0; | |
695 | } | |
696 | ||
e5f38ec3 | 697 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
698 | const unsigned char *old_sha1, int mustexist) |
699 | { | |
8da19775 | 700 | if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 701 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
702 | unlock_ref(lock); |
703 | return NULL; | |
704 | } | |
a89fccd2 | 705 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 706 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
707 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
708 | unlock_ref(lock); | |
709 | return NULL; | |
710 | } | |
711 | return lock; | |
712 | } | |
713 | ||
7155b727 | 714 | static int remove_empty_directories(const char *file) |
bc7127ef JH |
715 | { |
716 | /* we want to create a file but there is a directory there; | |
717 | * if that is an empty directory (or a directory that contains | |
718 | * only empty directories), remove them. | |
719 | */ | |
7155b727 JS |
720 | struct strbuf path; |
721 | int result; | |
bc7127ef | 722 | |
7155b727 JS |
723 | strbuf_init(&path, 20); |
724 | strbuf_addstr(&path, file); | |
725 | ||
726 | result = remove_dir_recursively(&path, 1); | |
727 | ||
728 | strbuf_release(&path); | |
729 | ||
730 | return result; | |
bc7127ef JH |
731 | } |
732 | ||
c976d415 LH |
733 | static int is_refname_available(const char *ref, const char *oldref, |
734 | struct ref_list *list, int quiet) | |
735 | { | |
736 | int namlen = strlen(ref); /* e.g. 'foo/bar' */ | |
737 | while (list) { | |
738 | /* list->name could be 'foo' or 'foo/bar/baz' */ | |
739 | if (!oldref || strcmp(oldref, list->name)) { | |
740 | int len = strlen(list->name); | |
741 | int cmplen = (namlen < len) ? namlen : len; | |
742 | const char *lead = (namlen < len) ? list->name : ref; | |
743 | if (!strncmp(ref, list->name, cmplen) && | |
744 | lead[cmplen] == '/') { | |
745 | if (!quiet) | |
746 | error("'%s' exists; cannot create '%s'", | |
747 | list->name, ref); | |
748 | return 0; | |
749 | } | |
750 | } | |
751 | list = list->next; | |
752 | } | |
753 | return 1; | |
754 | } | |
755 | ||
68db31cc | 756 | static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p) |
4bd18c43 | 757 | { |
434cd0cd | 758 | char *ref_file; |
ed378ec7 | 759 | const char *orig_ref = ref; |
4bd18c43 | 760 | struct ref_lock *lock; |
732232a1 | 761 | struct stat st; |
5cc3cef9 | 762 | int last_errno = 0; |
68db31cc | 763 | int type; |
4431fcc4 | 764 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
4bd18c43 SP |
765 | |
766 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
767 | lock->lock_fd = -1; | |
768 | ||
68db31cc | 769 | ref = resolve_ref(ref, lock->old_sha1, mustexist, &type); |
bc7127ef JH |
770 | if (!ref && errno == EISDIR) { |
771 | /* we are trying to lock foo but we used to | |
772 | * have foo/bar which now does not exist; | |
773 | * it is normal for the empty directory 'foo' | |
774 | * to remain. | |
775 | */ | |
776 | ref_file = git_path("%s", orig_ref); | |
5cc3cef9 JH |
777 | if (remove_empty_directories(ref_file)) { |
778 | last_errno = errno; | |
779 | error("there are still refs under '%s'", orig_ref); | |
780 | goto error_return; | |
781 | } | |
68db31cc | 782 | ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type); |
bc7127ef | 783 | } |
68db31cc SV |
784 | if (type_p) |
785 | *type_p = type; | |
ed378ec7 | 786 | if (!ref) { |
5cc3cef9 | 787 | last_errno = errno; |
818f477c | 788 | error("unable to resolve reference %s: %s", |
ed378ec7 | 789 | orig_ref, strerror(errno)); |
5cc3cef9 | 790 | goto error_return; |
4bd18c43 | 791 | } |
c976d415 LH |
792 | /* When the ref did not exist and we are creating it, |
793 | * make sure there is no existing ref that is packed | |
794 | * whose name begins with our refname, nor a ref whose | |
795 | * name is a proper prefix of our refname. | |
796 | */ | |
797 | if (is_null_sha1(lock->old_sha1) && | |
798 | !is_refname_available(ref, NULL, get_packed_refs(), 0)) | |
799 | goto error_return; | |
22a3844e | 800 | |
c33d5174 | 801 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 802 | |
68db31cc SV |
803 | if (flags & REF_NODEREF) |
804 | ref = orig_ref; | |
434cd0cd | 805 | lock->ref_name = xstrdup(ref); |
1655707c | 806 | lock->orig_ref_name = xstrdup(orig_ref); |
7c1a278d | 807 | ref_file = git_path("%s", ref); |
68db31cc SV |
808 | if (lstat(ref_file, &st) && errno == ENOENT) |
809 | lock->force_write = 1; | |
810 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
811 | lock->force_write = 1; | |
4bd18c43 | 812 | |
5cc3cef9 JH |
813 | if (safe_create_leading_directories(ref_file)) { |
814 | last_errno = errno; | |
815 | error("unable to create directory for %s", ref_file); | |
816 | goto error_return; | |
817 | } | |
434cd0cd | 818 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, 1); |
4bd18c43 SP |
819 | |
820 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; | |
5cc3cef9 JH |
821 | |
822 | error_return: | |
823 | unlock_ref(lock); | |
824 | errno = last_errno; | |
825 | return NULL; | |
4bd18c43 SP |
826 | } |
827 | ||
4431fcc4 | 828 | struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1) |
95fc7512 | 829 | { |
53cce84c | 830 | char refpath[PATH_MAX]; |
95fc7512 | 831 | if (check_ref_format(ref)) |
4bd18c43 | 832 | return NULL; |
53cce84c | 833 | strcpy(refpath, mkpath("refs/%s", ref)); |
68db31cc | 834 | return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL); |
4bd18c43 SP |
835 | } |
836 | ||
68db31cc | 837 | struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags) |
4bd18c43 | 838 | { |
5f7b202a | 839 | switch (check_ref_format(ref)) { |
5f7b202a | 840 | default: |
257f3020 JH |
841 | return NULL; |
842 | case 0: | |
843 | case CHECK_REF_FORMAT_ONELEVEL: | |
5f7b202a JH |
844 | return lock_ref_sha1_basic(ref, old_sha1, flags, NULL); |
845 | } | |
c0277d15 JH |
846 | } |
847 | ||
26a063a1 JH |
848 | static struct lock_file packlock; |
849 | ||
c0277d15 JH |
850 | static int repack_without_ref(const char *refname) |
851 | { | |
852 | struct ref_list *list, *packed_ref_list; | |
853 | int fd; | |
854 | int found = 0; | |
c0277d15 JH |
855 | |
856 | packed_ref_list = get_packed_refs(); | |
857 | for (list = packed_ref_list; list; list = list->next) { | |
858 | if (!strcmp(refname, list->name)) { | |
859 | found = 1; | |
860 | break; | |
861 | } | |
862 | } | |
863 | if (!found) | |
864 | return 0; | |
c0277d15 JH |
865 | fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0); |
866 | if (fd < 0) | |
867 | return error("cannot delete '%s' from packed refs", refname); | |
868 | ||
869 | for (list = packed_ref_list; list; list = list->next) { | |
870 | char line[PATH_MAX + 100]; | |
871 | int len; | |
872 | ||
873 | if (!strcmp(refname, list->name)) | |
874 | continue; | |
875 | len = snprintf(line, sizeof(line), "%s %s\n", | |
876 | sha1_to_hex(list->sha1), list->name); | |
877 | /* this should not happen but just being defensive */ | |
878 | if (len > sizeof(line)) | |
879 | die("too long a refname '%s'", list->name); | |
880 | write_or_die(fd, line, len); | |
881 | } | |
882 | return commit_lock_file(&packlock); | |
883 | } | |
884 | ||
1401f46b | 885 | int delete_ref(const char *refname, const unsigned char *sha1) |
c0277d15 JH |
886 | { |
887 | struct ref_lock *lock; | |
888 | int err, i, ret = 0, flag = 0; | |
889 | ||
68db31cc | 890 | lock = lock_ref_sha1_basic(refname, sha1, 0, &flag); |
c0277d15 JH |
891 | if (!lock) |
892 | return 1; | |
893 | if (!(flag & REF_ISPACKED)) { | |
894 | /* loose */ | |
895 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
896 | lock->lk->filename[i] = 0; | |
897 | err = unlink(lock->lk->filename); | |
898 | if (err) { | |
899 | ret = 1; | |
900 | error("unlink(%s) failed: %s", | |
901 | lock->lk->filename, strerror(errno)); | |
902 | } | |
903 | lock->lk->filename[i] = '.'; | |
904 | } | |
905 | /* removing the loose one could have resurrected an earlier | |
906 | * packed one. Also, if it was not loose we need to repack | |
907 | * without it. | |
908 | */ | |
909 | ret |= repack_without_ref(refname); | |
910 | ||
9a13f0b7 | 911 | err = unlink(git_path("logs/%s", lock->ref_name)); |
c0277d15 JH |
912 | if (err && errno != ENOENT) |
913 | fprintf(stderr, "warning: unlink(%s) failed: %s", | |
9a13f0b7 | 914 | git_path("logs/%s", lock->ref_name), strerror(errno)); |
c0277d15 JH |
915 | invalidate_cached_refs(); |
916 | unlock_ref(lock); | |
917 | return ret; | |
4bd18c43 SP |
918 | } |
919 | ||
678d0f4c | 920 | int rename_ref(const char *oldref, const char *newref, const char *logmsg) |
c976d415 LH |
921 | { |
922 | static const char renamed_ref[] = "RENAMED-REF"; | |
923 | unsigned char sha1[20], orig_sha1[20]; | |
924 | int flag = 0, logmoved = 0; | |
925 | struct ref_lock *lock; | |
c976d415 | 926 | struct stat loginfo; |
16c2bfbb | 927 | int log = !lstat(git_path("logs/%s", oldref), &loginfo); |
c976d415 LH |
928 | |
929 | if (S_ISLNK(loginfo.st_mode)) | |
930 | return error("reflog for %s is a symlink", oldref); | |
931 | ||
932 | if (!resolve_ref(oldref, orig_sha1, 1, &flag)) | |
933 | return error("refname %s not found", oldref); | |
934 | ||
935 | if (!is_refname_available(newref, oldref, get_packed_refs(), 0)) | |
936 | return 1; | |
937 | ||
938 | if (!is_refname_available(newref, oldref, get_loose_refs(), 0)) | |
939 | return 1; | |
940 | ||
68db31cc | 941 | lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL); |
c976d415 LH |
942 | if (!lock) |
943 | return error("unable to lock %s", renamed_ref); | |
944 | lock->force_write = 1; | |
678d0f4c | 945 | if (write_ref_sha1(lock, orig_sha1, logmsg)) |
c976d415 LH |
946 | return error("unable to save current sha1 in %s", renamed_ref); |
947 | ||
948 | if (log && rename(git_path("logs/%s", oldref), git_path("tmp-renamed-log"))) | |
949 | return error("unable to move logfile logs/%s to tmp-renamed-log: %s", | |
950 | oldref, strerror(errno)); | |
951 | ||
952 | if (delete_ref(oldref, orig_sha1)) { | |
953 | error("unable to delete old %s", oldref); | |
954 | goto rollback; | |
955 | } | |
956 | ||
957 | if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1)) { | |
958 | if (errno==EISDIR) { | |
959 | if (remove_empty_directories(git_path("%s", newref))) { | |
960 | error("Directory not empty: %s", newref); | |
961 | goto rollback; | |
962 | } | |
963 | } else { | |
964 | error("unable to delete existing %s", newref); | |
965 | goto rollback; | |
966 | } | |
967 | } | |
968 | ||
969 | if (log && safe_create_leading_directories(git_path("logs/%s", newref))) { | |
970 | error("unable to create directory for %s", newref); | |
971 | goto rollback; | |
972 | } | |
973 | ||
974 | retry: | |
975 | if (log && rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref))) { | |
d9e74d57 JR |
976 | if (errno==EISDIR || errno==ENOTDIR) { |
977 | /* | |
978 | * rename(a, b) when b is an existing | |
979 | * directory ought to result in ISDIR, but | |
980 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
981 | */ | |
c976d415 LH |
982 | if (remove_empty_directories(git_path("logs/%s", newref))) { |
983 | error("Directory not empty: logs/%s", newref); | |
984 | goto rollback; | |
985 | } | |
986 | goto retry; | |
987 | } else { | |
988 | error("unable to move logfile tmp-renamed-log to logs/%s: %s", | |
989 | newref, strerror(errno)); | |
990 | goto rollback; | |
991 | } | |
992 | } | |
993 | logmoved = log; | |
994 | ||
68db31cc | 995 | lock = lock_ref_sha1_basic(newref, NULL, 0, NULL); |
c976d415 LH |
996 | if (!lock) { |
997 | error("unable to lock %s for update", newref); | |
998 | goto rollback; | |
999 | } | |
1000 | ||
1001 | lock->force_write = 1; | |
1002 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 1003 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
c976d415 LH |
1004 | error("unable to write current sha1 into %s", newref); |
1005 | goto rollback; | |
1006 | } | |
1007 | ||
1008 | return 0; | |
1009 | ||
1010 | rollback: | |
68db31cc | 1011 | lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL); |
c976d415 LH |
1012 | if (!lock) { |
1013 | error("unable to lock %s for rollback", oldref); | |
1014 | goto rollbacklog; | |
1015 | } | |
1016 | ||
1017 | lock->force_write = 1; | |
1018 | flag = log_all_ref_updates; | |
1019 | log_all_ref_updates = 0; | |
1020 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
1021 | error("unable to write current sha1 into %s", oldref); | |
1022 | log_all_ref_updates = flag; | |
1023 | ||
1024 | rollbacklog: | |
1025 | if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref))) | |
1026 | error("unable to restore logfile %s from %s: %s", | |
1027 | oldref, newref, strerror(errno)); | |
1028 | if (!logmoved && log && | |
1029 | rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref))) | |
1030 | error("unable to restore logfile %s from tmp-renamed-log: %s", | |
1031 | oldref, strerror(errno)); | |
1032 | ||
1033 | return 1; | |
1034 | } | |
1035 | ||
435fc852 | 1036 | int close_ref(struct ref_lock *lock) |
b531394d BC |
1037 | { |
1038 | if (close_lock_file(lock->lk)) | |
1039 | return -1; | |
1040 | lock->lock_fd = -1; | |
1041 | return 0; | |
1042 | } | |
1043 | ||
435fc852 | 1044 | int commit_ref(struct ref_lock *lock) |
b531394d BC |
1045 | { |
1046 | if (commit_lock_file(lock->lk)) | |
1047 | return -1; | |
1048 | lock->lock_fd = -1; | |
1049 | return 0; | |
1050 | } | |
1051 | ||
e5f38ec3 | 1052 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 | 1053 | { |
4ed7cd3a BC |
1054 | /* Do not free lock->lk -- atexit() still looks at them */ |
1055 | if (lock->lk) | |
1056 | rollback_lock_file(lock->lk); | |
434cd0cd | 1057 | free(lock->ref_name); |
1655707c | 1058 | free(lock->orig_ref_name); |
4bd18c43 SP |
1059 | free(lock); |
1060 | } | |
1061 | ||
0ec29a47 JH |
1062 | /* |
1063 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
1064 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
1065 | * because reflog file is one line per entry. | |
1066 | */ | |
1067 | static int copy_msg(char *buf, const char *msg) | |
1068 | { | |
1069 | char *cp = buf; | |
1070 | char c; | |
1071 | int wasspace = 1; | |
1072 | ||
1073 | *cp++ = '\t'; | |
1074 | while ((c = *msg++)) { | |
1075 | if (wasspace && isspace(c)) | |
1076 | continue; | |
1077 | wasspace = isspace(c); | |
1078 | if (wasspace) | |
1079 | c = ' '; | |
1080 | *cp++ = c; | |
1081 | } | |
1082 | while (buf < cp && isspace(cp[-1])) | |
1083 | cp--; | |
1084 | *cp++ = '\n'; | |
1085 | return cp - buf; | |
1086 | } | |
1087 | ||
9a13f0b7 NP |
1088 | static int log_ref_write(const char *ref_name, const unsigned char *old_sha1, |
1089 | const unsigned char *new_sha1, const char *msg) | |
6de08ae6 SP |
1090 | { |
1091 | int logfd, written, oflags = O_APPEND | O_WRONLY; | |
1092 | unsigned maxlen, len; | |
8ac65937 | 1093 | int msglen; |
9a13f0b7 | 1094 | char *log_file, *logrec; |
ff4c8485 | 1095 | const char *committer; |
6de08ae6 | 1096 | |
510c5a8e | 1097 | if (log_all_ref_updates < 0) |
7d1864ce | 1098 | log_all_ref_updates = !is_bare_repository(); |
510c5a8e | 1099 | |
9a13f0b7 NP |
1100 | log_file = git_path("logs/%s", ref_name); |
1101 | ||
4057deb5 | 1102 | if (log_all_ref_updates && |
cc44c765 JH |
1103 | (!prefixcmp(ref_name, "refs/heads/") || |
1104 | !prefixcmp(ref_name, "refs/remotes/") || | |
bd104db1 | 1105 | !strcmp(ref_name, "HEAD"))) { |
9a13f0b7 | 1106 | if (safe_create_leading_directories(log_file) < 0) |
6de08ae6 | 1107 | return error("unable to create directory for %s", |
9a13f0b7 | 1108 | log_file); |
6de08ae6 SP |
1109 | oflags |= O_CREAT; |
1110 | } | |
1111 | ||
9a13f0b7 | 1112 | logfd = open(log_file, oflags, 0666); |
6de08ae6 | 1113 | if (logfd < 0) { |
1974bf62 | 1114 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 1115 | return 0; |
3b463c3f JH |
1116 | |
1117 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
9a13f0b7 | 1118 | if (remove_empty_directories(log_file)) { |
3b463c3f | 1119 | return error("There are still logs under '%s'", |
9a13f0b7 | 1120 | log_file); |
3b463c3f | 1121 | } |
9a13f0b7 | 1122 | logfd = open(log_file, oflags, 0666); |
3b463c3f JH |
1123 | } |
1124 | ||
1125 | if (logfd < 0) | |
1126 | return error("Unable to append to %s: %s", | |
9a13f0b7 | 1127 | log_file, strerror(errno)); |
6de08ae6 SP |
1128 | } |
1129 | ||
443b92b6 MK |
1130 | adjust_shared_perm(log_file); |
1131 | ||
0ec29a47 | 1132 | msglen = msg ? strlen(msg) : 0; |
774751a8 | 1133 | committer = git_committer_info(0); |
8ac65937 JH |
1134 | maxlen = strlen(committer) + msglen + 100; |
1135 | logrec = xmalloc(maxlen); | |
1136 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
1137 | sha1_to_hex(old_sha1), |
1138 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
1139 | committer); |
1140 | if (msglen) | |
0ec29a47 | 1141 | len += copy_msg(logrec + len - 1, msg) - 1; |
93822c22 | 1142 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 | 1143 | free(logrec); |
91c8d590 | 1144 | if (close(logfd) != 0 || written != len) |
9a13f0b7 | 1145 | return error("Unable to append to %s", log_file); |
6de08ae6 SP |
1146 | return 0; |
1147 | } | |
1148 | ||
c3b0dec5 LT |
1149 | static int is_branch(const char *refname) |
1150 | { | |
1151 | return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/"); | |
1152 | } | |
1153 | ||
4bd18c43 SP |
1154 | int write_ref_sha1(struct ref_lock *lock, |
1155 | const unsigned char *sha1, const char *logmsg) | |
1156 | { | |
1157 | static char term = '\n'; | |
c3b0dec5 | 1158 | struct object *o; |
4bd18c43 SP |
1159 | |
1160 | if (!lock) | |
95fc7512 | 1161 | return -1; |
a89fccd2 | 1162 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
1163 | unlock_ref(lock); |
1164 | return 0; | |
95fc7512 | 1165 | } |
c3b0dec5 LT |
1166 | o = parse_object(sha1); |
1167 | if (!o) { | |
1168 | error("Trying to write ref %s with nonexistant object %s", | |
1169 | lock->ref_name, sha1_to_hex(sha1)); | |
1170 | unlock_ref(lock); | |
1171 | return -1; | |
1172 | } | |
1173 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1174 | error("Trying to write non-commit object %s to branch %s", | |
1175 | sha1_to_hex(sha1), lock->ref_name); | |
1176 | unlock_ref(lock); | |
1177 | return -1; | |
1178 | } | |
93822c22 AW |
1179 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
1180 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
b531394d | 1181 | || close_ref(lock) < 0) { |
c33d5174 | 1182 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
1183 | unlock_ref(lock); |
1184 | return -1; | |
1185 | } | |
5e290ff7 | 1186 | invalidate_cached_refs(); |
bd104db1 NP |
1187 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
1188 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
1189 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
1190 | unlock_ref(lock); |
1191 | return -1; | |
1192 | } | |
605fac8b NP |
1193 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
1194 | /* | |
1195 | * Special hack: If a branch is updated directly and HEAD | |
1196 | * points to it (may happen on the remote side of a push | |
1197 | * for example) then logically the HEAD reflog should be | |
1198 | * updated too. | |
1199 | * A generic solution implies reverse symref information, | |
1200 | * but finding all symrefs pointing to the given branch | |
1201 | * would be rather costly for this rare event (the direct | |
1202 | * update of a branch) to be worth it. So let's cheat and | |
1203 | * check with HEAD only which should cover 99% of all usage | |
1204 | * scenarios (even 100% of the default ones). | |
1205 | */ | |
1206 | unsigned char head_sha1[20]; | |
1207 | int head_flag; | |
1208 | const char *head_ref; | |
1209 | head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag); | |
1210 | if (head_ref && (head_flag & REF_ISSYMREF) && | |
1211 | !strcmp(head_ref, lock->ref_name)) | |
1212 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
1213 | } | |
b531394d | 1214 | if (commit_ref(lock)) { |
434cd0cd | 1215 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
1216 | unlock_ref(lock); |
1217 | return -1; | |
1218 | } | |
4bd18c43 SP |
1219 | unlock_ref(lock); |
1220 | return 0; | |
95fc7512 | 1221 | } |
d556fae2 | 1222 | |
8b5157e4 NP |
1223 | int create_symref(const char *ref_target, const char *refs_heads_master, |
1224 | const char *logmsg) | |
41b625b0 NP |
1225 | { |
1226 | const char *lockpath; | |
1227 | char ref[1000]; | |
1228 | int fd, len, written; | |
47fc52e2 | 1229 | char *git_HEAD = xstrdup(git_path("%s", ref_target)); |
8b5157e4 NP |
1230 | unsigned char old_sha1[20], new_sha1[20]; |
1231 | ||
1232 | if (logmsg && read_ref(ref_target, old_sha1)) | |
1233 | hashclr(old_sha1); | |
41b625b0 | 1234 | |
d48744d1 JH |
1235 | if (safe_create_leading_directories(git_HEAD) < 0) |
1236 | return error("unable to create directory for %s", git_HEAD); | |
1237 | ||
41b625b0 NP |
1238 | #ifndef NO_SYMLINK_HEAD |
1239 | if (prefer_symlink_refs) { | |
1240 | unlink(git_HEAD); | |
1241 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 1242 | goto done; |
41b625b0 NP |
1243 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
1244 | } | |
1245 | #endif | |
1246 | ||
1247 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
1248 | if (sizeof(ref) <= len) { | |
1249 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 1250 | goto error_free_return; |
41b625b0 NP |
1251 | } |
1252 | lockpath = mkpath("%s.lock", git_HEAD); | |
1253 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
1254 | if (fd < 0) { | |
1255 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 1256 | goto error_free_return; |
41b625b0 NP |
1257 | } |
1258 | written = write_in_full(fd, ref, len); | |
91c8d590 | 1259 | if (close(fd) != 0 || written != len) { |
41b625b0 | 1260 | error("Unable to write to %s", lockpath); |
47fc52e2 | 1261 | goto error_unlink_return; |
41b625b0 NP |
1262 | } |
1263 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 1264 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 1265 | goto error_unlink_return; |
41b625b0 NP |
1266 | } |
1267 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 1268 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 JH |
1269 | error_unlink_return: |
1270 | unlink(lockpath); | |
1271 | error_free_return: | |
1272 | free(git_HEAD); | |
1273 | return -1; | |
41b625b0 | 1274 | } |
8b5157e4 | 1275 | |
ee96d11b | 1276 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 1277 | done: |
ee96d11b | 1278 | #endif |
8b5157e4 NP |
1279 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
1280 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
1281 | ||
47fc52e2 | 1282 | free(git_HEAD); |
41b625b0 NP |
1283 | return 0; |
1284 | } | |
1285 | ||
16d7cc90 JH |
1286 | static char *ref_msg(const char *line, const char *endp) |
1287 | { | |
1288 | const char *ep; | |
16d7cc90 | 1289 | line += 82; |
182af834 PH |
1290 | ep = memchr(line, '\n', endp - line); |
1291 | if (!ep) | |
1292 | ep = endp; | |
1293 | return xmemdupz(line, ep - line); | |
16d7cc90 JH |
1294 | } |
1295 | ||
1296 | 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 | 1297 | { |
e5229042 | 1298 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 | 1299 | char *tz_c; |
e29cb53a | 1300 | int logfd, tz, reccnt = 0; |
d556fae2 SP |
1301 | struct stat st; |
1302 | unsigned long date; | |
e5229042 | 1303 | unsigned char logged_sha1[20]; |
cb48cb58 | 1304 | void *log_mapped; |
dc49cd76 | 1305 | size_t mapsz; |
d556fae2 SP |
1306 | |
1307 | logfile = git_path("logs/%s", ref); | |
1308 | logfd = open(logfile, O_RDONLY, 0); | |
1309 | if (logfd < 0) | |
1310 | die("Unable to read log %s: %s", logfile, strerror(errno)); | |
1311 | fstat(logfd, &st); | |
1312 | if (!st.st_size) | |
1313 | die("Log %s is empty.", logfile); | |
dc49cd76 SP |
1314 | mapsz = xsize_t(st.st_size); |
1315 | log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0); | |
cb48cb58 | 1316 | logdata = log_mapped; |
d556fae2 SP |
1317 | close(logfd); |
1318 | ||
e5229042 | 1319 | lastrec = NULL; |
d556fae2 SP |
1320 | rec = logend = logdata + st.st_size; |
1321 | while (logdata < rec) { | |
e29cb53a | 1322 | reccnt++; |
d556fae2 SP |
1323 | if (logdata < rec && *(rec-1) == '\n') |
1324 | rec--; | |
e5229042 SP |
1325 | lastgt = NULL; |
1326 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 1327 | rec--; |
e5229042 SP |
1328 | if (*rec == '>') |
1329 | lastgt = rec; | |
1330 | } | |
1331 | if (!lastgt) | |
d556fae2 | 1332 | die("Log %s is corrupt.", logfile); |
e5229042 | 1333 | date = strtoul(lastgt + 1, &tz_c, 10); |
ab2a1a32 | 1334 | if (date <= at_time || cnt == 0) { |
76a44c5c | 1335 | tz = strtoul(tz_c, NULL, 10); |
16d7cc90 JH |
1336 | if (msg) |
1337 | *msg = ref_msg(rec, logend); | |
1338 | if (cutoff_time) | |
1339 | *cutoff_time = date; | |
1340 | if (cutoff_tz) | |
1341 | *cutoff_tz = tz; | |
1342 | if (cutoff_cnt) | |
76a44c5c | 1343 | *cutoff_cnt = reccnt - 1; |
e5229042 SP |
1344 | if (lastrec) { |
1345 | if (get_sha1_hex(lastrec, logged_sha1)) | |
1346 | die("Log %s is corrupt.", logfile); | |
1347 | if (get_sha1_hex(rec + 41, sha1)) | |
1348 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1349 | if (hashcmp(logged_sha1, sha1)) { |
e5229042 SP |
1350 | fprintf(stderr, |
1351 | "warning: Log %s has gap after %s.\n", | |
73013afd | 1352 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 | 1353 | } |
e5f38ec3 JH |
1354 | } |
1355 | else if (date == at_time) { | |
e5229042 SP |
1356 | if (get_sha1_hex(rec + 41, sha1)) |
1357 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
1358 | } |
1359 | else { | |
e5229042 SP |
1360 | if (get_sha1_hex(rec + 41, logged_sha1)) |
1361 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1362 | if (hashcmp(logged_sha1, sha1)) { |
e5229042 SP |
1363 | fprintf(stderr, |
1364 | "warning: Log %s unexpectedly ended on %s.\n", | |
73013afd | 1365 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 SP |
1366 | } |
1367 | } | |
dc49cd76 | 1368 | munmap(log_mapped, mapsz); |
d556fae2 SP |
1369 | return 0; |
1370 | } | |
e5229042 | 1371 | lastrec = rec; |
ab2a1a32 JH |
1372 | if (cnt > 0) |
1373 | cnt--; | |
d556fae2 SP |
1374 | } |
1375 | ||
e5229042 SP |
1376 | rec = logdata; |
1377 | while (rec < logend && *rec != '>' && *rec != '\n') | |
1378 | rec++; | |
1379 | if (rec == logend || *rec == '\n') | |
d556fae2 | 1380 | die("Log %s is corrupt.", logfile); |
e5229042 | 1381 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
1382 | tz = strtoul(tz_c, NULL, 10); |
1383 | if (get_sha1_hex(logdata, sha1)) | |
1384 | die("Log %s is corrupt.", logfile); | |
16d7cc90 JH |
1385 | if (msg) |
1386 | *msg = ref_msg(logdata, logend); | |
dc49cd76 | 1387 | munmap(log_mapped, mapsz); |
16d7cc90 JH |
1388 | |
1389 | if (cutoff_time) | |
1390 | *cutoff_time = date; | |
1391 | if (cutoff_tz) | |
1392 | *cutoff_tz = tz; | |
1393 | if (cutoff_cnt) | |
1394 | *cutoff_cnt = reccnt; | |
1395 | return 1; | |
d556fae2 | 1396 | } |
2ff81662 | 1397 | |
883d60fa | 1398 | int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data) |
2ff81662 JH |
1399 | { |
1400 | const char *logfile; | |
1401 | FILE *logfp; | |
1402 | char buf[1024]; | |
2266bf27 | 1403 | int ret = 0; |
2ff81662 JH |
1404 | |
1405 | logfile = git_path("logs/%s", ref); | |
1406 | logfp = fopen(logfile, "r"); | |
1407 | if (!logfp) | |
883d60fa | 1408 | return -1; |
2ff81662 JH |
1409 | while (fgets(buf, sizeof(buf), logfp)) { |
1410 | unsigned char osha1[20], nsha1[20]; | |
883d60fa JS |
1411 | char *email_end, *message; |
1412 | unsigned long timestamp; | |
2266bf27 | 1413 | int len, tz; |
2ff81662 JH |
1414 | |
1415 | /* old SP new SP name <email> SP time TAB msg LF */ | |
1416 | len = strlen(buf); | |
1417 | if (len < 83 || buf[len-1] != '\n' || | |
1418 | get_sha1_hex(buf, osha1) || buf[40] != ' ' || | |
883d60fa JS |
1419 | get_sha1_hex(buf + 41, nsha1) || buf[81] != ' ' || |
1420 | !(email_end = strchr(buf + 82, '>')) || | |
1421 | email_end[1] != ' ' || | |
1422 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
1423 | !message || message[0] != ' ' || | |
1424 | (message[1] != '+' && message[1] != '-') || | |
1425 | !isdigit(message[2]) || !isdigit(message[3]) || | |
b4dd4856 | 1426 | !isdigit(message[4]) || !isdigit(message[5])) |
2ff81662 | 1427 | continue; /* corrupt? */ |
883d60fa JS |
1428 | email_end[1] = '\0'; |
1429 | tz = strtol(message + 1, NULL, 10); | |
b4dd4856 JS |
1430 | if (message[6] != '\t') |
1431 | message += 6; | |
1432 | else | |
1433 | message += 7; | |
883d60fa JS |
1434 | ret = fn(osha1, nsha1, buf+82, timestamp, tz, message, cb_data); |
1435 | if (ret) | |
2266bf27 | 1436 | break; |
2ff81662 JH |
1437 | } |
1438 | fclose(logfp); | |
2266bf27 | 1439 | return ret; |
2ff81662 | 1440 | } |
e29cb53a | 1441 | |
eb8381c8 NP |
1442 | static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data) |
1443 | { | |
1444 | DIR *dir = opendir(git_path("logs/%s", base)); | |
fcee5a14 | 1445 | int retval = 0; |
eb8381c8 NP |
1446 | |
1447 | if (dir) { | |
1448 | struct dirent *de; | |
1449 | int baselen = strlen(base); | |
1450 | char *log = xmalloc(baselen + 257); | |
1451 | ||
1452 | memcpy(log, base, baselen); | |
1453 | if (baselen && base[baselen-1] != '/') | |
1454 | log[baselen++] = '/'; | |
1455 | ||
1456 | while ((de = readdir(dir)) != NULL) { | |
1457 | struct stat st; | |
1458 | int namelen; | |
1459 | ||
1460 | if (de->d_name[0] == '.') | |
1461 | continue; | |
1462 | namelen = strlen(de->d_name); | |
1463 | if (namelen > 255) | |
1464 | continue; | |
1465 | if (has_extension(de->d_name, ".lock")) | |
1466 | continue; | |
1467 | memcpy(log + baselen, de->d_name, namelen+1); | |
1468 | if (stat(git_path("logs/%s", log), &st) < 0) | |
1469 | continue; | |
1470 | if (S_ISDIR(st.st_mode)) { | |
1471 | retval = do_for_each_reflog(log, fn, cb_data); | |
1472 | } else { | |
1473 | unsigned char sha1[20]; | |
1474 | if (!resolve_ref(log, sha1, 0, NULL)) | |
1475 | retval = error("bad ref for %s", log); | |
1476 | else | |
1477 | retval = fn(log, sha1, 0, cb_data); | |
1478 | } | |
1479 | if (retval) | |
1480 | break; | |
1481 | } | |
1482 | free(log); | |
1483 | closedir(dir); | |
1484 | } | |
acb39f64 | 1485 | else if (*base) |
fcee5a14 | 1486 | return errno; |
eb8381c8 NP |
1487 | return retval; |
1488 | } | |
1489 | ||
1490 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
1491 | { | |
1492 | return do_for_each_reflog("", fn, cb_data); | |
1493 | } | |
3d9f037c CR |
1494 | |
1495 | int update_ref(const char *action, const char *refname, | |
1496 | const unsigned char *sha1, const unsigned char *oldval, | |
1497 | int flags, enum action_on_err onerr) | |
1498 | { | |
1499 | static struct ref_lock *lock; | |
1500 | lock = lock_any_ref_for_update(refname, oldval, flags); | |
1501 | if (!lock) { | |
1502 | const char *str = "Cannot lock the ref '%s'."; | |
1503 | switch (onerr) { | |
1504 | case MSG_ON_ERR: error(str, refname); break; | |
1505 | case DIE_ON_ERR: die(str, refname); break; | |
1506 | case QUIET_ON_ERR: break; | |
1507 | } | |
1508 | return 1; | |
1509 | } | |
1510 | if (write_ref_sha1(lock, sha1, action) < 0) { | |
1511 | const char *str = "Cannot update the ref '%s'."; | |
1512 | switch (onerr) { | |
1513 | case MSG_ON_ERR: error(str, refname); break; | |
1514 | case DIE_ON_ERR: die(str, refname); break; | |
1515 | case QUIET_ON_ERR: break; | |
1516 | } | |
1517 | return 1; | |
1518 | } | |
1519 | return 0; | |
1520 | } | |
cda69f48 JK |
1521 | |
1522 | struct ref *find_ref_by_name(struct ref *list, const char *name) | |
1523 | { | |
1524 | for ( ; list; list = list->next) | |
1525 | if (!strcmp(list->name, name)) | |
1526 | return list; | |
1527 | return NULL; | |
1528 | } |