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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 | { |
0104ca09 HO |
371 | int depth = MAXDEPTH; |
372 | ssize_t len; | |
a876ed83 | 373 | char buffer[256]; |
ed378ec7 | 374 | static char ref_buffer[256]; |
ca8db142 | 375 | |
8da19775 JH |
376 | if (flag) |
377 | *flag = 0; | |
378 | ||
a876ed83 | 379 | for (;;) { |
ed378ec7 | 380 | const char *path = git_path("%s", ref); |
a876ed83 JH |
381 | struct stat st; |
382 | char *buf; | |
383 | int fd; | |
8a65ff76 | 384 | |
a876ed83 JH |
385 | if (--depth < 0) |
386 | return NULL; | |
ca8db142 | 387 | |
a876ed83 JH |
388 | /* Special case: non-existing file. |
389 | * Not having the refs/heads/new-branch is OK | |
390 | * if we are writing into it, so is .git/HEAD | |
391 | * that points at refs/heads/master still to be | |
392 | * born. It is NOT OK if we are resolving for | |
393 | * reading. | |
394 | */ | |
395 | if (lstat(path, &st) < 0) { | |
434cd0cd LT |
396 | struct ref_list *list = get_packed_refs(); |
397 | while (list) { | |
f4204ab9 | 398 | if (!strcmp(ref, list->name)) { |
434cd0cd | 399 | hashcpy(sha1, list->sha1); |
8da19775 JH |
400 | if (flag) |
401 | *flag |= REF_ISPACKED; | |
434cd0cd LT |
402 | return ref; |
403 | } | |
404 | list = list->next; | |
405 | } | |
a876ed83 JH |
406 | if (reading || errno != ENOENT) |
407 | return NULL; | |
e702496e | 408 | hashclr(sha1); |
ed378ec7 | 409 | return ref; |
a876ed83 | 410 | } |
ca8db142 | 411 | |
a876ed83 JH |
412 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
413 | if (S_ISLNK(st.st_mode)) { | |
414 | len = readlink(path, buffer, sizeof(buffer)-1); | |
415 | if (len >= 5 && !memcmp("refs/", buffer, 5)) { | |
ed378ec7 LT |
416 | buffer[len] = 0; |
417 | strcpy(ref_buffer, buffer); | |
418 | ref = ref_buffer; | |
8da19775 JH |
419 | if (flag) |
420 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
421 | continue; |
422 | } | |
ca8db142 | 423 | } |
a876ed83 | 424 | |
7a21632f DS |
425 | /* Is it a directory? */ |
426 | if (S_ISDIR(st.st_mode)) { | |
427 | errno = EISDIR; | |
428 | return NULL; | |
429 | } | |
430 | ||
a876ed83 JH |
431 | /* |
432 | * Anything else, just open it and try to use it as | |
433 | * a ref | |
434 | */ | |
435 | fd = open(path, O_RDONLY); | |
436 | if (fd < 0) | |
437 | return NULL; | |
93d26e4c | 438 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
a876ed83 JH |
439 | close(fd); |
440 | ||
441 | /* | |
442 | * Is it a symbolic ref? | |
443 | */ | |
444 | if (len < 4 || memcmp("ref:", buffer, 4)) | |
445 | break; | |
446 | buf = buffer + 4; | |
447 | len -= 4; | |
448 | while (len && isspace(*buf)) | |
449 | buf++, len--; | |
450 | while (len && isspace(buf[len-1])) | |
ed378ec7 LT |
451 | len--; |
452 | buf[len] = 0; | |
453 | memcpy(ref_buffer, buf, len + 1); | |
454 | ref = ref_buffer; | |
8da19775 JH |
455 | if (flag) |
456 | *flag |= REF_ISSYMREF; | |
8a65ff76 | 457 | } |
a876ed83 JH |
458 | if (len < 40 || get_sha1_hex(buffer, sha1)) |
459 | return NULL; | |
ed378ec7 | 460 | return ref; |
a876ed83 JH |
461 | } |
462 | ||
ed378ec7 | 463 | int read_ref(const char *ref, unsigned char *sha1) |
a876ed83 | 464 | { |
8da19775 | 465 | if (resolve_ref(ref, sha1, 1, NULL)) |
a876ed83 JH |
466 | return 0; |
467 | return -1; | |
8a65ff76 LT |
468 | } |
469 | ||
ef06b918 JH |
470 | static int do_one_ref(const char *base, each_ref_fn fn, int trim, |
471 | void *cb_data, struct ref_list *entry) | |
472 | { | |
473 | if (strncmp(base, entry->name, trim)) | |
474 | return 0; | |
475 | if (is_null_sha1(entry->sha1)) | |
476 | return 0; | |
477 | if (!has_sha1_file(entry->sha1)) { | |
478 | error("%s does not point to a valid object!", entry->name); | |
479 | return 0; | |
480 | } | |
0ae91be0 | 481 | current_ref = entry; |
ef06b918 JH |
482 | return fn(entry->name + trim, entry->sha1, entry->flag, cb_data); |
483 | } | |
484 | ||
cf0adba7 JH |
485 | int peel_ref(const char *ref, unsigned char *sha1) |
486 | { | |
487 | int flag; | |
488 | unsigned char base[20]; | |
489 | struct object *o; | |
490 | ||
0ae91be0 SP |
491 | if (current_ref && (current_ref->name == ref |
492 | || !strcmp(current_ref->name, ref))) { | |
493 | if (current_ref->flag & REF_KNOWS_PEELED) { | |
494 | hashcpy(sha1, current_ref->peeled); | |
495 | return 0; | |
496 | } | |
497 | hashcpy(base, current_ref->sha1); | |
498 | goto fallback; | |
499 | } | |
500 | ||
cf0adba7 JH |
501 | if (!resolve_ref(ref, base, 1, &flag)) |
502 | return -1; | |
503 | ||
504 | if ((flag & REF_ISPACKED)) { | |
505 | struct ref_list *list = get_packed_refs(); | |
cf0adba7 JH |
506 | |
507 | while (list) { | |
f4204ab9 JH |
508 | if (!strcmp(list->name, ref)) { |
509 | if (list->flag & REF_KNOWS_PEELED) { | |
510 | hashcpy(sha1, list->peeled); | |
511 | return 0; | |
512 | } | |
513 | /* older pack-refs did not leave peeled ones */ | |
514 | break; | |
cf0adba7 JH |
515 | } |
516 | list = list->next; | |
517 | } | |
cf0adba7 JH |
518 | } |
519 | ||
0ae91be0 | 520 | fallback: |
cf0adba7 | 521 | o = parse_object(base); |
8c87dc77 | 522 | if (o && o->type == OBJ_TAG) { |
cf0adba7 JH |
523 | o = deref_tag(o, ref, 0); |
524 | if (o) { | |
525 | hashcpy(sha1, o->sha1); | |
526 | return 0; | |
527 | } | |
528 | } | |
529 | return -1; | |
530 | } | |
531 | ||
8da19775 JH |
532 | static int do_for_each_ref(const char *base, each_ref_fn fn, int trim, |
533 | void *cb_data) | |
8a65ff76 | 534 | { |
0ae91be0 | 535 | int retval = 0; |
e1e22e37 LT |
536 | struct ref_list *packed = get_packed_refs(); |
537 | struct ref_list *loose = get_loose_refs(); | |
8a65ff76 | 538 | |
e1e22e37 LT |
539 | while (packed && loose) { |
540 | struct ref_list *entry; | |
541 | int cmp = strcmp(packed->name, loose->name); | |
542 | if (!cmp) { | |
543 | packed = packed->next; | |
544 | continue; | |
6cada6a9 | 545 | } |
e1e22e37 LT |
546 | if (cmp > 0) { |
547 | entry = loose; | |
548 | loose = loose->next; | |
549 | } else { | |
550 | entry = packed; | |
551 | packed = packed->next; | |
552 | } | |
ef06b918 | 553 | retval = do_one_ref(base, fn, trim, cb_data, entry); |
e1e22e37 | 554 | if (retval) |
0ae91be0 | 555 | goto end_each; |
e1e22e37 | 556 | } |
8a65ff76 | 557 | |
ef06b918 JH |
558 | for (packed = packed ? packed : loose; packed; packed = packed->next) { |
559 | retval = do_one_ref(base, fn, trim, cb_data, packed); | |
560 | if (retval) | |
0ae91be0 | 561 | goto end_each; |
8a65ff76 | 562 | } |
0ae91be0 SP |
563 | |
564 | end_each: | |
565 | current_ref = NULL; | |
566 | return retval; | |
8a65ff76 LT |
567 | } |
568 | ||
cb5d709f | 569 | int head_ref(each_ref_fn fn, void *cb_data) |
723c31fe LT |
570 | { |
571 | unsigned char sha1[20]; | |
8da19775 JH |
572 | int flag; |
573 | ||
574 | if (resolve_ref("HEAD", sha1, 1, &flag)) | |
575 | return fn("HEAD", sha1, flag, cb_data); | |
2f34ba32 | 576 | return 0; |
723c31fe LT |
577 | } |
578 | ||
cb5d709f | 579 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 580 | { |
cb5d709f | 581 | return do_for_each_ref("refs/", fn, 0, cb_data); |
a62be77f SE |
582 | } |
583 | ||
cb5d709f | 584 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 585 | { |
cb5d709f | 586 | return do_for_each_ref("refs/tags/", fn, 10, cb_data); |
a62be77f SE |
587 | } |
588 | ||
cb5d709f | 589 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 590 | { |
cb5d709f | 591 | return do_for_each_ref("refs/heads/", fn, 11, cb_data); |
a62be77f SE |
592 | } |
593 | ||
cb5d709f | 594 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 595 | { |
cb5d709f | 596 | return do_for_each_ref("refs/remotes/", fn, 13, cb_data); |
8a65ff76 LT |
597 | } |
598 | ||
03feddd6 JH |
599 | /* |
600 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
601 | * We do not like it if: | |
602 | * | |
603 | * - any path component of it begins with ".", or | |
604 | * - it has double dots "..", or | |
605 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
606 | * - it ends with a "/". | |
607 | */ | |
608 | ||
609 | static inline int bad_ref_char(int ch) | |
610 | { | |
8558fd9e DB |
611 | if (((unsigned) ch) <= ' ' || |
612 | ch == '~' || ch == '^' || ch == ':') | |
613 | return 1; | |
614 | /* 2.13 Pattern Matching Notation */ | |
615 | if (ch == '?' || ch == '[') /* Unsupported */ | |
616 | return 1; | |
617 | if (ch == '*') /* Supported at the end */ | |
618 | return 2; | |
619 | return 0; | |
03feddd6 JH |
620 | } |
621 | ||
95fc7512 DB |
622 | int check_ref_format(const char *ref) |
623 | { | |
8558fd9e | 624 | int ch, level, bad_type; |
03feddd6 JH |
625 | const char *cp = ref; |
626 | ||
627 | level = 0; | |
628 | while (1) { | |
629 | while ((ch = *cp++) == '/') | |
630 | ; /* tolerate duplicated slashes */ | |
631 | if (!ch) | |
5f7b202a JH |
632 | /* should not end with slashes */ |
633 | return CHECK_REF_FORMAT_ERROR; | |
03feddd6 JH |
634 | |
635 | /* we are at the beginning of the path component */ | |
8558fd9e | 636 | if (ch == '.') |
5f7b202a | 637 | return CHECK_REF_FORMAT_ERROR; |
8558fd9e DB |
638 | bad_type = bad_ref_char(ch); |
639 | if (bad_type) { | |
5f7b202a JH |
640 | return (bad_type == 2 && !*cp) |
641 | ? CHECK_REF_FORMAT_WILDCARD | |
642 | : CHECK_REF_FORMAT_ERROR; | |
8558fd9e | 643 | } |
03feddd6 JH |
644 | |
645 | /* scan the rest of the path component */ | |
646 | while ((ch = *cp++) != 0) { | |
8558fd9e DB |
647 | bad_type = bad_ref_char(ch); |
648 | if (bad_type) { | |
5f7b202a JH |
649 | return (bad_type == 2 && !*cp) |
650 | ? CHECK_REF_FORMAT_WILDCARD | |
651 | : CHECK_REF_FORMAT_ERROR; | |
8558fd9e | 652 | } |
03feddd6 JH |
653 | if (ch == '/') |
654 | break; | |
655 | if (ch == '.' && *cp == '.') | |
5f7b202a | 656 | return CHECK_REF_FORMAT_ERROR; |
03feddd6 JH |
657 | } |
658 | level++; | |
659 | if (!ch) { | |
660 | if (level < 2) | |
5f7b202a JH |
661 | return CHECK_REF_FORMAT_ONELEVEL; |
662 | return CHECK_REF_FORMAT_OK; | |
03feddd6 JH |
663 | } |
664 | } | |
95fc7512 DB |
665 | } |
666 | ||
79803322 SP |
667 | const char *ref_rev_parse_rules[] = { |
668 | "%.*s", | |
669 | "refs/%.*s", | |
670 | "refs/tags/%.*s", | |
671 | "refs/heads/%.*s", | |
672 | "refs/remotes/%.*s", | |
673 | "refs/remotes/%.*s/HEAD", | |
674 | NULL | |
675 | }; | |
676 | ||
605b4978 SP |
677 | const char *ref_fetch_rules[] = { |
678 | "%.*s", | |
679 | "refs/%.*s", | |
680 | "refs/heads/%.*s", | |
681 | NULL | |
682 | }; | |
683 | ||
79803322 SP |
684 | int refname_match(const char *abbrev_name, const char *full_name, const char **rules) |
685 | { | |
686 | const char **p; | |
687 | const int abbrev_name_len = strlen(abbrev_name); | |
688 | ||
689 | for (p = rules; *p; p++) { | |
690 | if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { | |
691 | return 1; | |
692 | } | |
693 | } | |
694 | ||
695 | return 0; | |
696 | } | |
697 | ||
e5f38ec3 | 698 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
699 | const unsigned char *old_sha1, int mustexist) |
700 | { | |
8da19775 | 701 | if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 702 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
703 | unlock_ref(lock); |
704 | return NULL; | |
705 | } | |
a89fccd2 | 706 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 707 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
708 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
709 | unlock_ref(lock); | |
710 | return NULL; | |
711 | } | |
712 | return lock; | |
713 | } | |
714 | ||
7155b727 | 715 | static int remove_empty_directories(const char *file) |
bc7127ef JH |
716 | { |
717 | /* we want to create a file but there is a directory there; | |
718 | * if that is an empty directory (or a directory that contains | |
719 | * only empty directories), remove them. | |
720 | */ | |
7155b727 JS |
721 | struct strbuf path; |
722 | int result; | |
bc7127ef | 723 | |
7155b727 JS |
724 | strbuf_init(&path, 20); |
725 | strbuf_addstr(&path, file); | |
726 | ||
727 | result = remove_dir_recursively(&path, 1); | |
728 | ||
729 | strbuf_release(&path); | |
730 | ||
731 | return result; | |
bc7127ef JH |
732 | } |
733 | ||
c976d415 LH |
734 | static int is_refname_available(const char *ref, const char *oldref, |
735 | struct ref_list *list, int quiet) | |
736 | { | |
737 | int namlen = strlen(ref); /* e.g. 'foo/bar' */ | |
738 | while (list) { | |
739 | /* list->name could be 'foo' or 'foo/bar/baz' */ | |
740 | if (!oldref || strcmp(oldref, list->name)) { | |
741 | int len = strlen(list->name); | |
742 | int cmplen = (namlen < len) ? namlen : len; | |
743 | const char *lead = (namlen < len) ? list->name : ref; | |
744 | if (!strncmp(ref, list->name, cmplen) && | |
745 | lead[cmplen] == '/') { | |
746 | if (!quiet) | |
747 | error("'%s' exists; cannot create '%s'", | |
748 | list->name, ref); | |
749 | return 0; | |
750 | } | |
751 | } | |
752 | list = list->next; | |
753 | } | |
754 | return 1; | |
755 | } | |
756 | ||
68db31cc | 757 | static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p) |
4bd18c43 | 758 | { |
434cd0cd | 759 | char *ref_file; |
ed378ec7 | 760 | const char *orig_ref = ref; |
4bd18c43 | 761 | struct ref_lock *lock; |
732232a1 | 762 | struct stat st; |
5cc3cef9 | 763 | int last_errno = 0; |
68db31cc | 764 | int type; |
4431fcc4 | 765 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
4bd18c43 SP |
766 | |
767 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
768 | lock->lock_fd = -1; | |
769 | ||
68db31cc | 770 | ref = resolve_ref(ref, lock->old_sha1, mustexist, &type); |
bc7127ef JH |
771 | if (!ref && errno == EISDIR) { |
772 | /* we are trying to lock foo but we used to | |
773 | * have foo/bar which now does not exist; | |
774 | * it is normal for the empty directory 'foo' | |
775 | * to remain. | |
776 | */ | |
777 | ref_file = git_path("%s", orig_ref); | |
5cc3cef9 JH |
778 | if (remove_empty_directories(ref_file)) { |
779 | last_errno = errno; | |
780 | error("there are still refs under '%s'", orig_ref); | |
781 | goto error_return; | |
782 | } | |
68db31cc | 783 | ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type); |
bc7127ef | 784 | } |
68db31cc SV |
785 | if (type_p) |
786 | *type_p = type; | |
ed378ec7 | 787 | if (!ref) { |
5cc3cef9 | 788 | last_errno = errno; |
818f477c | 789 | error("unable to resolve reference %s: %s", |
ed378ec7 | 790 | orig_ref, strerror(errno)); |
5cc3cef9 | 791 | goto error_return; |
4bd18c43 | 792 | } |
c976d415 LH |
793 | /* When the ref did not exist and we are creating it, |
794 | * make sure there is no existing ref that is packed | |
795 | * whose name begins with our refname, nor a ref whose | |
796 | * name is a proper prefix of our refname. | |
797 | */ | |
798 | if (is_null_sha1(lock->old_sha1) && | |
799 | !is_refname_available(ref, NULL, get_packed_refs(), 0)) | |
800 | goto error_return; | |
22a3844e | 801 | |
c33d5174 | 802 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 803 | |
68db31cc SV |
804 | if (flags & REF_NODEREF) |
805 | ref = orig_ref; | |
434cd0cd | 806 | lock->ref_name = xstrdup(ref); |
1655707c | 807 | lock->orig_ref_name = xstrdup(orig_ref); |
7c1a278d | 808 | ref_file = git_path("%s", ref); |
68db31cc SV |
809 | if (lstat(ref_file, &st) && errno == ENOENT) |
810 | lock->force_write = 1; | |
811 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
812 | lock->force_write = 1; | |
4bd18c43 | 813 | |
5cc3cef9 JH |
814 | if (safe_create_leading_directories(ref_file)) { |
815 | last_errno = errno; | |
816 | error("unable to create directory for %s", ref_file); | |
817 | goto error_return; | |
818 | } | |
434cd0cd | 819 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, 1); |
4bd18c43 SP |
820 | |
821 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; | |
5cc3cef9 JH |
822 | |
823 | error_return: | |
824 | unlock_ref(lock); | |
825 | errno = last_errno; | |
826 | return NULL; | |
4bd18c43 SP |
827 | } |
828 | ||
4431fcc4 | 829 | struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1) |
95fc7512 | 830 | { |
53cce84c | 831 | char refpath[PATH_MAX]; |
95fc7512 | 832 | if (check_ref_format(ref)) |
4bd18c43 | 833 | return NULL; |
53cce84c | 834 | strcpy(refpath, mkpath("refs/%s", ref)); |
68db31cc | 835 | return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL); |
4bd18c43 SP |
836 | } |
837 | ||
68db31cc | 838 | struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags) |
4bd18c43 | 839 | { |
5f7b202a | 840 | switch (check_ref_format(ref)) { |
5f7b202a | 841 | default: |
257f3020 JH |
842 | return NULL; |
843 | case 0: | |
844 | case CHECK_REF_FORMAT_ONELEVEL: | |
5f7b202a JH |
845 | return lock_ref_sha1_basic(ref, old_sha1, flags, NULL); |
846 | } | |
c0277d15 JH |
847 | } |
848 | ||
26a063a1 JH |
849 | static struct lock_file packlock; |
850 | ||
c0277d15 JH |
851 | static int repack_without_ref(const char *refname) |
852 | { | |
853 | struct ref_list *list, *packed_ref_list; | |
854 | int fd; | |
855 | int found = 0; | |
c0277d15 JH |
856 | |
857 | packed_ref_list = get_packed_refs(); | |
858 | for (list = packed_ref_list; list; list = list->next) { | |
859 | if (!strcmp(refname, list->name)) { | |
860 | found = 1; | |
861 | break; | |
862 | } | |
863 | } | |
864 | if (!found) | |
865 | return 0; | |
c0277d15 JH |
866 | fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0); |
867 | if (fd < 0) | |
868 | return error("cannot delete '%s' from packed refs", refname); | |
869 | ||
870 | for (list = packed_ref_list; list; list = list->next) { | |
871 | char line[PATH_MAX + 100]; | |
872 | int len; | |
873 | ||
874 | if (!strcmp(refname, list->name)) | |
875 | continue; | |
876 | len = snprintf(line, sizeof(line), "%s %s\n", | |
877 | sha1_to_hex(list->sha1), list->name); | |
878 | /* this should not happen but just being defensive */ | |
879 | if (len > sizeof(line)) | |
880 | die("too long a refname '%s'", list->name); | |
881 | write_or_die(fd, line, len); | |
882 | } | |
883 | return commit_lock_file(&packlock); | |
884 | } | |
885 | ||
1401f46b | 886 | int delete_ref(const char *refname, const unsigned char *sha1) |
c0277d15 JH |
887 | { |
888 | struct ref_lock *lock; | |
889 | int err, i, ret = 0, flag = 0; | |
890 | ||
68db31cc | 891 | lock = lock_ref_sha1_basic(refname, sha1, 0, &flag); |
c0277d15 JH |
892 | if (!lock) |
893 | return 1; | |
894 | if (!(flag & REF_ISPACKED)) { | |
895 | /* loose */ | |
896 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
897 | lock->lk->filename[i] = 0; | |
898 | err = unlink(lock->lk->filename); | |
899 | if (err) { | |
900 | ret = 1; | |
901 | error("unlink(%s) failed: %s", | |
902 | lock->lk->filename, strerror(errno)); | |
903 | } | |
904 | lock->lk->filename[i] = '.'; | |
905 | } | |
906 | /* removing the loose one could have resurrected an earlier | |
907 | * packed one. Also, if it was not loose we need to repack | |
908 | * without it. | |
909 | */ | |
910 | ret |= repack_without_ref(refname); | |
911 | ||
9a13f0b7 | 912 | err = unlink(git_path("logs/%s", lock->ref_name)); |
c0277d15 JH |
913 | if (err && errno != ENOENT) |
914 | fprintf(stderr, "warning: unlink(%s) failed: %s", | |
9a13f0b7 | 915 | git_path("logs/%s", lock->ref_name), strerror(errno)); |
c0277d15 JH |
916 | invalidate_cached_refs(); |
917 | unlock_ref(lock); | |
918 | return ret; | |
4bd18c43 SP |
919 | } |
920 | ||
678d0f4c | 921 | int rename_ref(const char *oldref, const char *newref, const char *logmsg) |
c976d415 LH |
922 | { |
923 | static const char renamed_ref[] = "RENAMED-REF"; | |
924 | unsigned char sha1[20], orig_sha1[20]; | |
925 | int flag = 0, logmoved = 0; | |
926 | struct ref_lock *lock; | |
c976d415 | 927 | struct stat loginfo; |
16c2bfbb | 928 | int log = !lstat(git_path("logs/%s", oldref), &loginfo); |
c976d415 LH |
929 | |
930 | if (S_ISLNK(loginfo.st_mode)) | |
931 | return error("reflog for %s is a symlink", oldref); | |
932 | ||
933 | if (!resolve_ref(oldref, orig_sha1, 1, &flag)) | |
934 | return error("refname %s not found", oldref); | |
935 | ||
936 | if (!is_refname_available(newref, oldref, get_packed_refs(), 0)) | |
937 | return 1; | |
938 | ||
939 | if (!is_refname_available(newref, oldref, get_loose_refs(), 0)) | |
940 | return 1; | |
941 | ||
68db31cc | 942 | lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL); |
c976d415 LH |
943 | if (!lock) |
944 | return error("unable to lock %s", renamed_ref); | |
945 | lock->force_write = 1; | |
678d0f4c | 946 | if (write_ref_sha1(lock, orig_sha1, logmsg)) |
c976d415 LH |
947 | return error("unable to save current sha1 in %s", renamed_ref); |
948 | ||
949 | if (log && rename(git_path("logs/%s", oldref), git_path("tmp-renamed-log"))) | |
950 | return error("unable to move logfile logs/%s to tmp-renamed-log: %s", | |
951 | oldref, strerror(errno)); | |
952 | ||
953 | if (delete_ref(oldref, orig_sha1)) { | |
954 | error("unable to delete old %s", oldref); | |
955 | goto rollback; | |
956 | } | |
957 | ||
958 | if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1)) { | |
959 | if (errno==EISDIR) { | |
960 | if (remove_empty_directories(git_path("%s", newref))) { | |
961 | error("Directory not empty: %s", newref); | |
962 | goto rollback; | |
963 | } | |
964 | } else { | |
965 | error("unable to delete existing %s", newref); | |
966 | goto rollback; | |
967 | } | |
968 | } | |
969 | ||
970 | if (log && safe_create_leading_directories(git_path("logs/%s", newref))) { | |
971 | error("unable to create directory for %s", newref); | |
972 | goto rollback; | |
973 | } | |
974 | ||
975 | retry: | |
976 | if (log && rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref))) { | |
d9e74d57 JR |
977 | if (errno==EISDIR || errno==ENOTDIR) { |
978 | /* | |
979 | * rename(a, b) when b is an existing | |
980 | * directory ought to result in ISDIR, but | |
981 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
982 | */ | |
c976d415 LH |
983 | if (remove_empty_directories(git_path("logs/%s", newref))) { |
984 | error("Directory not empty: logs/%s", newref); | |
985 | goto rollback; | |
986 | } | |
987 | goto retry; | |
988 | } else { | |
989 | error("unable to move logfile tmp-renamed-log to logs/%s: %s", | |
990 | newref, strerror(errno)); | |
991 | goto rollback; | |
992 | } | |
993 | } | |
994 | logmoved = log; | |
995 | ||
68db31cc | 996 | lock = lock_ref_sha1_basic(newref, NULL, 0, NULL); |
c976d415 LH |
997 | if (!lock) { |
998 | error("unable to lock %s for update", newref); | |
999 | goto rollback; | |
1000 | } | |
1001 | ||
1002 | lock->force_write = 1; | |
1003 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 1004 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
c976d415 LH |
1005 | error("unable to write current sha1 into %s", newref); |
1006 | goto rollback; | |
1007 | } | |
1008 | ||
1009 | return 0; | |
1010 | ||
1011 | rollback: | |
68db31cc | 1012 | lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL); |
c976d415 LH |
1013 | if (!lock) { |
1014 | error("unable to lock %s for rollback", oldref); | |
1015 | goto rollbacklog; | |
1016 | } | |
1017 | ||
1018 | lock->force_write = 1; | |
1019 | flag = log_all_ref_updates; | |
1020 | log_all_ref_updates = 0; | |
1021 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
1022 | error("unable to write current sha1 into %s", oldref); | |
1023 | log_all_ref_updates = flag; | |
1024 | ||
1025 | rollbacklog: | |
1026 | if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref))) | |
1027 | error("unable to restore logfile %s from %s: %s", | |
1028 | oldref, newref, strerror(errno)); | |
1029 | if (!logmoved && log && | |
1030 | rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref))) | |
1031 | error("unable to restore logfile %s from tmp-renamed-log: %s", | |
1032 | oldref, strerror(errno)); | |
1033 | ||
1034 | return 1; | |
1035 | } | |
1036 | ||
435fc852 | 1037 | int close_ref(struct ref_lock *lock) |
b531394d BC |
1038 | { |
1039 | if (close_lock_file(lock->lk)) | |
1040 | return -1; | |
1041 | lock->lock_fd = -1; | |
1042 | return 0; | |
1043 | } | |
1044 | ||
435fc852 | 1045 | int commit_ref(struct ref_lock *lock) |
b531394d BC |
1046 | { |
1047 | if (commit_lock_file(lock->lk)) | |
1048 | return -1; | |
1049 | lock->lock_fd = -1; | |
1050 | return 0; | |
1051 | } | |
1052 | ||
e5f38ec3 | 1053 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 | 1054 | { |
4ed7cd3a BC |
1055 | /* Do not free lock->lk -- atexit() still looks at them */ |
1056 | if (lock->lk) | |
1057 | rollback_lock_file(lock->lk); | |
434cd0cd | 1058 | free(lock->ref_name); |
1655707c | 1059 | free(lock->orig_ref_name); |
4bd18c43 SP |
1060 | free(lock); |
1061 | } | |
1062 | ||
0ec29a47 JH |
1063 | /* |
1064 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
1065 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
1066 | * because reflog file is one line per entry. | |
1067 | */ | |
1068 | static int copy_msg(char *buf, const char *msg) | |
1069 | { | |
1070 | char *cp = buf; | |
1071 | char c; | |
1072 | int wasspace = 1; | |
1073 | ||
1074 | *cp++ = '\t'; | |
1075 | while ((c = *msg++)) { | |
1076 | if (wasspace && isspace(c)) | |
1077 | continue; | |
1078 | wasspace = isspace(c); | |
1079 | if (wasspace) | |
1080 | c = ' '; | |
1081 | *cp++ = c; | |
1082 | } | |
1083 | while (buf < cp && isspace(cp[-1])) | |
1084 | cp--; | |
1085 | *cp++ = '\n'; | |
1086 | return cp - buf; | |
1087 | } | |
1088 | ||
9a13f0b7 NP |
1089 | static int log_ref_write(const char *ref_name, const unsigned char *old_sha1, |
1090 | const unsigned char *new_sha1, const char *msg) | |
6de08ae6 SP |
1091 | { |
1092 | int logfd, written, oflags = O_APPEND | O_WRONLY; | |
1093 | unsigned maxlen, len; | |
8ac65937 | 1094 | int msglen; |
9a13f0b7 | 1095 | char *log_file, *logrec; |
ff4c8485 | 1096 | const char *committer; |
6de08ae6 | 1097 | |
510c5a8e | 1098 | if (log_all_ref_updates < 0) |
7d1864ce | 1099 | log_all_ref_updates = !is_bare_repository(); |
510c5a8e | 1100 | |
9a13f0b7 NP |
1101 | log_file = git_path("logs/%s", ref_name); |
1102 | ||
4057deb5 | 1103 | if (log_all_ref_updates && |
cc44c765 JH |
1104 | (!prefixcmp(ref_name, "refs/heads/") || |
1105 | !prefixcmp(ref_name, "refs/remotes/") || | |
bd104db1 | 1106 | !strcmp(ref_name, "HEAD"))) { |
9a13f0b7 | 1107 | if (safe_create_leading_directories(log_file) < 0) |
6de08ae6 | 1108 | return error("unable to create directory for %s", |
9a13f0b7 | 1109 | log_file); |
6de08ae6 SP |
1110 | oflags |= O_CREAT; |
1111 | } | |
1112 | ||
9a13f0b7 | 1113 | logfd = open(log_file, oflags, 0666); |
6de08ae6 | 1114 | if (logfd < 0) { |
1974bf62 | 1115 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 1116 | return 0; |
3b463c3f JH |
1117 | |
1118 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
9a13f0b7 | 1119 | if (remove_empty_directories(log_file)) { |
3b463c3f | 1120 | return error("There are still logs under '%s'", |
9a13f0b7 | 1121 | log_file); |
3b463c3f | 1122 | } |
9a13f0b7 | 1123 | logfd = open(log_file, oflags, 0666); |
3b463c3f JH |
1124 | } |
1125 | ||
1126 | if (logfd < 0) | |
1127 | return error("Unable to append to %s: %s", | |
9a13f0b7 | 1128 | log_file, strerror(errno)); |
6de08ae6 SP |
1129 | } |
1130 | ||
443b92b6 MK |
1131 | adjust_shared_perm(log_file); |
1132 | ||
0ec29a47 | 1133 | msglen = msg ? strlen(msg) : 0; |
774751a8 | 1134 | committer = git_committer_info(0); |
8ac65937 JH |
1135 | maxlen = strlen(committer) + msglen + 100; |
1136 | logrec = xmalloc(maxlen); | |
1137 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
1138 | sha1_to_hex(old_sha1), |
1139 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
1140 | committer); |
1141 | if (msglen) | |
0ec29a47 | 1142 | len += copy_msg(logrec + len - 1, msg) - 1; |
93822c22 | 1143 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 | 1144 | free(logrec); |
91c8d590 | 1145 | if (close(logfd) != 0 || written != len) |
9a13f0b7 | 1146 | return error("Unable to append to %s", log_file); |
6de08ae6 SP |
1147 | return 0; |
1148 | } | |
1149 | ||
c3b0dec5 LT |
1150 | static int is_branch(const char *refname) |
1151 | { | |
1152 | return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/"); | |
1153 | } | |
1154 | ||
4bd18c43 SP |
1155 | int write_ref_sha1(struct ref_lock *lock, |
1156 | const unsigned char *sha1, const char *logmsg) | |
1157 | { | |
1158 | static char term = '\n'; | |
c3b0dec5 | 1159 | struct object *o; |
4bd18c43 SP |
1160 | |
1161 | if (!lock) | |
95fc7512 | 1162 | return -1; |
a89fccd2 | 1163 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
1164 | unlock_ref(lock); |
1165 | return 0; | |
95fc7512 | 1166 | } |
c3b0dec5 LT |
1167 | o = parse_object(sha1); |
1168 | if (!o) { | |
1169 | error("Trying to write ref %s with nonexistant object %s", | |
1170 | lock->ref_name, sha1_to_hex(sha1)); | |
1171 | unlock_ref(lock); | |
1172 | return -1; | |
1173 | } | |
1174 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1175 | error("Trying to write non-commit object %s to branch %s", | |
1176 | sha1_to_hex(sha1), lock->ref_name); | |
1177 | unlock_ref(lock); | |
1178 | return -1; | |
1179 | } | |
93822c22 AW |
1180 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
1181 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
b531394d | 1182 | || close_ref(lock) < 0) { |
c33d5174 | 1183 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
1184 | unlock_ref(lock); |
1185 | return -1; | |
1186 | } | |
5e290ff7 | 1187 | invalidate_cached_refs(); |
bd104db1 NP |
1188 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
1189 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
1190 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
1191 | unlock_ref(lock); |
1192 | return -1; | |
1193 | } | |
605fac8b NP |
1194 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
1195 | /* | |
1196 | * Special hack: If a branch is updated directly and HEAD | |
1197 | * points to it (may happen on the remote side of a push | |
1198 | * for example) then logically the HEAD reflog should be | |
1199 | * updated too. | |
1200 | * A generic solution implies reverse symref information, | |
1201 | * but finding all symrefs pointing to the given branch | |
1202 | * would be rather costly for this rare event (the direct | |
1203 | * update of a branch) to be worth it. So let's cheat and | |
1204 | * check with HEAD only which should cover 99% of all usage | |
1205 | * scenarios (even 100% of the default ones). | |
1206 | */ | |
1207 | unsigned char head_sha1[20]; | |
1208 | int head_flag; | |
1209 | const char *head_ref; | |
1210 | head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag); | |
1211 | if (head_ref && (head_flag & REF_ISSYMREF) && | |
1212 | !strcmp(head_ref, lock->ref_name)) | |
1213 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
1214 | } | |
b531394d | 1215 | if (commit_ref(lock)) { |
434cd0cd | 1216 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
1217 | unlock_ref(lock); |
1218 | return -1; | |
1219 | } | |
4bd18c43 SP |
1220 | unlock_ref(lock); |
1221 | return 0; | |
95fc7512 | 1222 | } |
d556fae2 | 1223 | |
8b5157e4 NP |
1224 | int create_symref(const char *ref_target, const char *refs_heads_master, |
1225 | const char *logmsg) | |
41b625b0 NP |
1226 | { |
1227 | const char *lockpath; | |
1228 | char ref[1000]; | |
1229 | int fd, len, written; | |
47fc52e2 | 1230 | char *git_HEAD = xstrdup(git_path("%s", ref_target)); |
8b5157e4 NP |
1231 | unsigned char old_sha1[20], new_sha1[20]; |
1232 | ||
1233 | if (logmsg && read_ref(ref_target, old_sha1)) | |
1234 | hashclr(old_sha1); | |
41b625b0 | 1235 | |
d48744d1 JH |
1236 | if (safe_create_leading_directories(git_HEAD) < 0) |
1237 | return error("unable to create directory for %s", git_HEAD); | |
1238 | ||
41b625b0 NP |
1239 | #ifndef NO_SYMLINK_HEAD |
1240 | if (prefer_symlink_refs) { | |
1241 | unlink(git_HEAD); | |
1242 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 1243 | goto done; |
41b625b0 NP |
1244 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
1245 | } | |
1246 | #endif | |
1247 | ||
1248 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
1249 | if (sizeof(ref) <= len) { | |
1250 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 1251 | goto error_free_return; |
41b625b0 NP |
1252 | } |
1253 | lockpath = mkpath("%s.lock", git_HEAD); | |
1254 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
1255 | if (fd < 0) { | |
1256 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 1257 | goto error_free_return; |
41b625b0 NP |
1258 | } |
1259 | written = write_in_full(fd, ref, len); | |
91c8d590 | 1260 | if (close(fd) != 0 || written != len) { |
41b625b0 | 1261 | error("Unable to write to %s", lockpath); |
47fc52e2 | 1262 | goto error_unlink_return; |
41b625b0 NP |
1263 | } |
1264 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 1265 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 1266 | goto error_unlink_return; |
41b625b0 NP |
1267 | } |
1268 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 1269 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 JH |
1270 | error_unlink_return: |
1271 | unlink(lockpath); | |
1272 | error_free_return: | |
1273 | free(git_HEAD); | |
1274 | return -1; | |
41b625b0 | 1275 | } |
8b5157e4 | 1276 | |
ee96d11b | 1277 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 1278 | done: |
ee96d11b | 1279 | #endif |
8b5157e4 NP |
1280 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
1281 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
1282 | ||
47fc52e2 | 1283 | free(git_HEAD); |
41b625b0 NP |
1284 | return 0; |
1285 | } | |
1286 | ||
16d7cc90 JH |
1287 | static char *ref_msg(const char *line, const char *endp) |
1288 | { | |
1289 | const char *ep; | |
16d7cc90 | 1290 | line += 82; |
182af834 PH |
1291 | ep = memchr(line, '\n', endp - line); |
1292 | if (!ep) | |
1293 | ep = endp; | |
1294 | return xmemdupz(line, ep - line); | |
16d7cc90 JH |
1295 | } |
1296 | ||
1297 | 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 | 1298 | { |
e5229042 | 1299 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 | 1300 | char *tz_c; |
e29cb53a | 1301 | int logfd, tz, reccnt = 0; |
d556fae2 SP |
1302 | struct stat st; |
1303 | unsigned long date; | |
e5229042 | 1304 | unsigned char logged_sha1[20]; |
cb48cb58 | 1305 | void *log_mapped; |
dc49cd76 | 1306 | size_t mapsz; |
d556fae2 SP |
1307 | |
1308 | logfile = git_path("logs/%s", ref); | |
1309 | logfd = open(logfile, O_RDONLY, 0); | |
1310 | if (logfd < 0) | |
1311 | die("Unable to read log %s: %s", logfile, strerror(errno)); | |
1312 | fstat(logfd, &st); | |
1313 | if (!st.st_size) | |
1314 | die("Log %s is empty.", logfile); | |
dc49cd76 SP |
1315 | mapsz = xsize_t(st.st_size); |
1316 | log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0); | |
cb48cb58 | 1317 | logdata = log_mapped; |
d556fae2 SP |
1318 | close(logfd); |
1319 | ||
e5229042 | 1320 | lastrec = NULL; |
d556fae2 SP |
1321 | rec = logend = logdata + st.st_size; |
1322 | while (logdata < rec) { | |
e29cb53a | 1323 | reccnt++; |
d556fae2 SP |
1324 | if (logdata < rec && *(rec-1) == '\n') |
1325 | rec--; | |
e5229042 SP |
1326 | lastgt = NULL; |
1327 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 1328 | rec--; |
e5229042 SP |
1329 | if (*rec == '>') |
1330 | lastgt = rec; | |
1331 | } | |
1332 | if (!lastgt) | |
d556fae2 | 1333 | die("Log %s is corrupt.", logfile); |
e5229042 | 1334 | date = strtoul(lastgt + 1, &tz_c, 10); |
ab2a1a32 | 1335 | if (date <= at_time || cnt == 0) { |
76a44c5c | 1336 | tz = strtoul(tz_c, NULL, 10); |
16d7cc90 JH |
1337 | if (msg) |
1338 | *msg = ref_msg(rec, logend); | |
1339 | if (cutoff_time) | |
1340 | *cutoff_time = date; | |
1341 | if (cutoff_tz) | |
1342 | *cutoff_tz = tz; | |
1343 | if (cutoff_cnt) | |
76a44c5c | 1344 | *cutoff_cnt = reccnt - 1; |
e5229042 SP |
1345 | if (lastrec) { |
1346 | if (get_sha1_hex(lastrec, logged_sha1)) | |
1347 | die("Log %s is corrupt.", logfile); | |
1348 | if (get_sha1_hex(rec + 41, sha1)) | |
1349 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1350 | if (hashcmp(logged_sha1, sha1)) { |
e5229042 SP |
1351 | fprintf(stderr, |
1352 | "warning: Log %s has gap after %s.\n", | |
73013afd | 1353 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 | 1354 | } |
e5f38ec3 JH |
1355 | } |
1356 | else if (date == at_time) { | |
e5229042 SP |
1357 | if (get_sha1_hex(rec + 41, sha1)) |
1358 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
1359 | } |
1360 | else { | |
e5229042 SP |
1361 | if (get_sha1_hex(rec + 41, logged_sha1)) |
1362 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1363 | if (hashcmp(logged_sha1, sha1)) { |
e5229042 SP |
1364 | fprintf(stderr, |
1365 | "warning: Log %s unexpectedly ended on %s.\n", | |
73013afd | 1366 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 SP |
1367 | } |
1368 | } | |
dc49cd76 | 1369 | munmap(log_mapped, mapsz); |
d556fae2 SP |
1370 | return 0; |
1371 | } | |
e5229042 | 1372 | lastrec = rec; |
ab2a1a32 JH |
1373 | if (cnt > 0) |
1374 | cnt--; | |
d556fae2 SP |
1375 | } |
1376 | ||
e5229042 SP |
1377 | rec = logdata; |
1378 | while (rec < logend && *rec != '>' && *rec != '\n') | |
1379 | rec++; | |
1380 | if (rec == logend || *rec == '\n') | |
d556fae2 | 1381 | die("Log %s is corrupt.", logfile); |
e5229042 | 1382 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
1383 | tz = strtoul(tz_c, NULL, 10); |
1384 | if (get_sha1_hex(logdata, sha1)) | |
1385 | die("Log %s is corrupt.", logfile); | |
16d7cc90 JH |
1386 | if (msg) |
1387 | *msg = ref_msg(logdata, logend); | |
dc49cd76 | 1388 | munmap(log_mapped, mapsz); |
16d7cc90 JH |
1389 | |
1390 | if (cutoff_time) | |
1391 | *cutoff_time = date; | |
1392 | if (cutoff_tz) | |
1393 | *cutoff_tz = tz; | |
1394 | if (cutoff_cnt) | |
1395 | *cutoff_cnt = reccnt; | |
1396 | return 1; | |
d556fae2 | 1397 | } |
2ff81662 | 1398 | |
883d60fa | 1399 | int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data) |
2ff81662 JH |
1400 | { |
1401 | const char *logfile; | |
1402 | FILE *logfp; | |
1403 | char buf[1024]; | |
2266bf27 | 1404 | int ret = 0; |
2ff81662 JH |
1405 | |
1406 | logfile = git_path("logs/%s", ref); | |
1407 | logfp = fopen(logfile, "r"); | |
1408 | if (!logfp) | |
883d60fa | 1409 | return -1; |
2ff81662 JH |
1410 | while (fgets(buf, sizeof(buf), logfp)) { |
1411 | unsigned char osha1[20], nsha1[20]; | |
883d60fa JS |
1412 | char *email_end, *message; |
1413 | unsigned long timestamp; | |
2266bf27 | 1414 | int len, tz; |
2ff81662 JH |
1415 | |
1416 | /* old SP new SP name <email> SP time TAB msg LF */ | |
1417 | len = strlen(buf); | |
1418 | if (len < 83 || buf[len-1] != '\n' || | |
1419 | get_sha1_hex(buf, osha1) || buf[40] != ' ' || | |
883d60fa JS |
1420 | get_sha1_hex(buf + 41, nsha1) || buf[81] != ' ' || |
1421 | !(email_end = strchr(buf + 82, '>')) || | |
1422 | email_end[1] != ' ' || | |
1423 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
1424 | !message || message[0] != ' ' || | |
1425 | (message[1] != '+' && message[1] != '-') || | |
1426 | !isdigit(message[2]) || !isdigit(message[3]) || | |
b4dd4856 | 1427 | !isdigit(message[4]) || !isdigit(message[5])) |
2ff81662 | 1428 | continue; /* corrupt? */ |
883d60fa JS |
1429 | email_end[1] = '\0'; |
1430 | tz = strtol(message + 1, NULL, 10); | |
b4dd4856 JS |
1431 | if (message[6] != '\t') |
1432 | message += 6; | |
1433 | else | |
1434 | message += 7; | |
883d60fa JS |
1435 | ret = fn(osha1, nsha1, buf+82, timestamp, tz, message, cb_data); |
1436 | if (ret) | |
2266bf27 | 1437 | break; |
2ff81662 JH |
1438 | } |
1439 | fclose(logfp); | |
2266bf27 | 1440 | return ret; |
2ff81662 | 1441 | } |
e29cb53a | 1442 | |
eb8381c8 NP |
1443 | static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data) |
1444 | { | |
1445 | DIR *dir = opendir(git_path("logs/%s", base)); | |
fcee5a14 | 1446 | int retval = 0; |
eb8381c8 NP |
1447 | |
1448 | if (dir) { | |
1449 | struct dirent *de; | |
1450 | int baselen = strlen(base); | |
1451 | char *log = xmalloc(baselen + 257); | |
1452 | ||
1453 | memcpy(log, base, baselen); | |
1454 | if (baselen && base[baselen-1] != '/') | |
1455 | log[baselen++] = '/'; | |
1456 | ||
1457 | while ((de = readdir(dir)) != NULL) { | |
1458 | struct stat st; | |
1459 | int namelen; | |
1460 | ||
1461 | if (de->d_name[0] == '.') | |
1462 | continue; | |
1463 | namelen = strlen(de->d_name); | |
1464 | if (namelen > 255) | |
1465 | continue; | |
1466 | if (has_extension(de->d_name, ".lock")) | |
1467 | continue; | |
1468 | memcpy(log + baselen, de->d_name, namelen+1); | |
1469 | if (stat(git_path("logs/%s", log), &st) < 0) | |
1470 | continue; | |
1471 | if (S_ISDIR(st.st_mode)) { | |
1472 | retval = do_for_each_reflog(log, fn, cb_data); | |
1473 | } else { | |
1474 | unsigned char sha1[20]; | |
1475 | if (!resolve_ref(log, sha1, 0, NULL)) | |
1476 | retval = error("bad ref for %s", log); | |
1477 | else | |
1478 | retval = fn(log, sha1, 0, cb_data); | |
1479 | } | |
1480 | if (retval) | |
1481 | break; | |
1482 | } | |
1483 | free(log); | |
1484 | closedir(dir); | |
1485 | } | |
acb39f64 | 1486 | else if (*base) |
fcee5a14 | 1487 | return errno; |
eb8381c8 NP |
1488 | return retval; |
1489 | } | |
1490 | ||
1491 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
1492 | { | |
1493 | return do_for_each_reflog("", fn, cb_data); | |
1494 | } | |
3d9f037c CR |
1495 | |
1496 | int update_ref(const char *action, const char *refname, | |
1497 | const unsigned char *sha1, const unsigned char *oldval, | |
1498 | int flags, enum action_on_err onerr) | |
1499 | { | |
1500 | static struct ref_lock *lock; | |
1501 | lock = lock_any_ref_for_update(refname, oldval, flags); | |
1502 | if (!lock) { | |
1503 | const char *str = "Cannot lock the ref '%s'."; | |
1504 | switch (onerr) { | |
1505 | case MSG_ON_ERR: error(str, refname); break; | |
1506 | case DIE_ON_ERR: die(str, refname); break; | |
1507 | case QUIET_ON_ERR: break; | |
1508 | } | |
1509 | return 1; | |
1510 | } | |
1511 | if (write_ref_sha1(lock, sha1, action) < 0) { | |
1512 | const char *str = "Cannot update the ref '%s'."; | |
1513 | switch (onerr) { | |
1514 | case MSG_ON_ERR: error(str, refname); break; | |
1515 | case DIE_ON_ERR: die(str, refname); break; | |
1516 | case QUIET_ON_ERR: break; | |
1517 | } | |
1518 | return 1; | |
1519 | } | |
1520 | return 0; | |
1521 | } | |
cda69f48 JK |
1522 | |
1523 | struct ref *find_ref_by_name(struct ref *list, const char *name) | |
1524 | { | |
1525 | for ( ; list; list = list->next) | |
1526 | if (!strcmp(list->name, name)) | |
1527 | return list; | |
1528 | return NULL; | |
1529 | } |