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Commit | Line | Data |
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95fc7512 | 1 | #include "cache.h" |
85023577 | 2 | #include "refs.h" |
cf0adba7 JH |
3 | #include "object.h" |
4 | #include "tag.h" | |
7155b727 | 5 | #include "dir.h" |
95fc7512 | 6 | |
f4204ab9 JH |
7 | /* ISSYMREF=01 and ISPACKED=02 are public interfaces */ |
8 | #define REF_KNOWS_PEELED 04 | |
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; | |
160 | ||
161 | static void free_ref_list(struct ref_list *list) | |
162 | { | |
163 | struct ref_list *next; | |
164 | for ( ; list; list = next) { | |
165 | next = list->next; | |
166 | free(list); | |
167 | } | |
168 | } | |
169 | ||
170 | static void invalidate_cached_refs(void) | |
e1e22e37 | 171 | { |
5e290ff7 JH |
172 | struct cached_refs *ca = &cached_refs; |
173 | ||
174 | if (ca->did_loose && ca->loose) | |
175 | free_ref_list(ca->loose); | |
176 | if (ca->did_packed && ca->packed) | |
177 | free_ref_list(ca->packed); | |
178 | ca->loose = ca->packed = NULL; | |
179 | ca->did_loose = ca->did_packed = 0; | |
180 | } | |
e1e22e37 | 181 | |
f4204ab9 JH |
182 | static void read_packed_refs(FILE *f, struct cached_refs *cached_refs) |
183 | { | |
184 | struct ref_list *list = NULL; | |
185 | struct ref_list *last = NULL; | |
186 | char refline[PATH_MAX]; | |
187 | int flag = REF_ISPACKED; | |
188 | ||
189 | while (fgets(refline, sizeof(refline), f)) { | |
190 | unsigned char sha1[20]; | |
191 | const char *name; | |
192 | static const char header[] = "# pack-refs with:"; | |
193 | ||
194 | if (!strncmp(refline, header, sizeof(header)-1)) { | |
195 | const char *traits = refline + sizeof(header) - 1; | |
196 | if (strstr(traits, " peeled ")) | |
197 | flag |= REF_KNOWS_PEELED; | |
198 | /* perhaps other traits later as well */ | |
199 | continue; | |
200 | } | |
201 | ||
202 | name = parse_ref_line(refline, sha1); | |
203 | if (name) { | |
204 | list = add_ref(name, sha1, flag, list, &last); | |
205 | continue; | |
206 | } | |
207 | if (last && | |
208 | refline[0] == '^' && | |
209 | strlen(refline) == 42 && | |
210 | refline[41] == '\n' && | |
211 | !get_sha1_hex(refline + 1, sha1)) | |
212 | hashcpy(last->peeled, sha1); | |
213 | } | |
c774aab9 | 214 | cached_refs->packed = sort_ref_list(list); |
f4204ab9 JH |
215 | } |
216 | ||
5e290ff7 JH |
217 | static struct ref_list *get_packed_refs(void) |
218 | { | |
219 | if (!cached_refs.did_packed) { | |
e1e22e37 | 220 | FILE *f = fopen(git_path("packed-refs"), "r"); |
f4204ab9 | 221 | cached_refs.packed = NULL; |
e1e22e37 | 222 | if (f) { |
f4204ab9 | 223 | read_packed_refs(f, &cached_refs); |
e1e22e37 | 224 | fclose(f); |
e1e22e37 | 225 | } |
5e290ff7 | 226 | cached_refs.did_packed = 1; |
e1e22e37 | 227 | } |
5e290ff7 | 228 | return cached_refs.packed; |
e1e22e37 LT |
229 | } |
230 | ||
231 | static struct ref_list *get_ref_dir(const char *base, struct ref_list *list) | |
232 | { | |
233 | DIR *dir = opendir(git_path("%s", base)); | |
234 | ||
235 | if (dir) { | |
236 | struct dirent *de; | |
237 | int baselen = strlen(base); | |
ed378ec7 | 238 | char *ref = xmalloc(baselen + 257); |
e1e22e37 | 239 | |
ed378ec7 | 240 | memcpy(ref, base, baselen); |
e1e22e37 | 241 | if (baselen && base[baselen-1] != '/') |
ed378ec7 | 242 | ref[baselen++] = '/'; |
e1e22e37 LT |
243 | |
244 | while ((de = readdir(dir)) != NULL) { | |
245 | unsigned char sha1[20]; | |
246 | struct stat st; | |
8da19775 | 247 | int flag; |
e1e22e37 LT |
248 | int namelen; |
249 | ||
250 | if (de->d_name[0] == '.') | |
251 | continue; | |
252 | namelen = strlen(de->d_name); | |
253 | if (namelen > 255) | |
254 | continue; | |
255 | if (has_extension(de->d_name, ".lock")) | |
256 | continue; | |
ed378ec7 LT |
257 | memcpy(ref + baselen, de->d_name, namelen+1); |
258 | if (stat(git_path("%s", ref), &st) < 0) | |
e1e22e37 LT |
259 | continue; |
260 | if (S_ISDIR(st.st_mode)) { | |
ed378ec7 | 261 | list = get_ref_dir(ref, list); |
e1e22e37 LT |
262 | continue; |
263 | } | |
8da19775 | 264 | if (!resolve_ref(ref, sha1, 1, &flag)) { |
ed378ec7 | 265 | error("%s points nowhere!", ref); |
e1e22e37 LT |
266 | continue; |
267 | } | |
f4204ab9 | 268 | list = add_ref(ref, sha1, flag, list, NULL); |
e1e22e37 | 269 | } |
ed378ec7 | 270 | free(ref); |
e1e22e37 LT |
271 | closedir(dir); |
272 | } | |
c774aab9 | 273 | return sort_ref_list(list); |
e1e22e37 LT |
274 | } |
275 | ||
276 | static struct ref_list *get_loose_refs(void) | |
277 | { | |
5e290ff7 JH |
278 | if (!cached_refs.did_loose) { |
279 | cached_refs.loose = get_ref_dir("refs", NULL); | |
280 | cached_refs.did_loose = 1; | |
e1e22e37 | 281 | } |
5e290ff7 | 282 | return cached_refs.loose; |
e1e22e37 LT |
283 | } |
284 | ||
ca8db142 LT |
285 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
286 | #define MAXDEPTH 5 | |
0ebde32c LT |
287 | #define MAXREFLEN (1024) |
288 | ||
289 | static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result) | |
290 | { | |
291 | FILE *f; | |
292 | struct cached_refs refs; | |
293 | struct ref_list *ref; | |
294 | int retval; | |
295 | ||
296 | strcpy(name + pathlen, "packed-refs"); | |
297 | f = fopen(name, "r"); | |
298 | if (!f) | |
299 | return -1; | |
300 | read_packed_refs(f, &refs); | |
301 | fclose(f); | |
302 | ref = refs.packed; | |
303 | retval = -1; | |
304 | while (ref) { | |
305 | if (!strcmp(ref->name, refname)) { | |
306 | retval = 0; | |
307 | memcpy(result, ref->sha1, 20); | |
308 | break; | |
309 | } | |
310 | ref = ref->next; | |
311 | } | |
312 | free_ref_list(refs.packed); | |
313 | return retval; | |
314 | } | |
315 | ||
316 | static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion) | |
317 | { | |
318 | int fd, len = strlen(refname); | |
319 | char buffer[128], *p; | |
320 | ||
321 | if (recursion > MAXDEPTH || len > MAXREFLEN) | |
322 | return -1; | |
323 | memcpy(name + pathlen, refname, len+1); | |
324 | fd = open(name, O_RDONLY); | |
325 | if (fd < 0) | |
326 | return resolve_gitlink_packed_ref(name, pathlen, refname, result); | |
327 | ||
328 | len = read(fd, buffer, sizeof(buffer)-1); | |
329 | close(fd); | |
330 | if (len < 0) | |
331 | return -1; | |
332 | while (len && isspace(buffer[len-1])) | |
333 | len--; | |
334 | buffer[len] = 0; | |
335 | ||
336 | /* Was it a detached head or an old-fashioned symlink? */ | |
337 | if (!get_sha1_hex(buffer, result)) | |
338 | return 0; | |
339 | ||
340 | /* Symref? */ | |
341 | if (strncmp(buffer, "ref:", 4)) | |
342 | return -1; | |
343 | p = buffer + 4; | |
344 | while (isspace(*p)) | |
345 | p++; | |
346 | ||
347 | return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1); | |
348 | } | |
349 | ||
350 | int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result) | |
351 | { | |
352 | int len = strlen(path), retval; | |
353 | char *gitdir; | |
354 | ||
355 | while (len && path[len-1] == '/') | |
356 | len--; | |
357 | if (!len) | |
358 | return -1; | |
359 | gitdir = xmalloc(len + MAXREFLEN + 8); | |
360 | memcpy(gitdir, path, len); | |
361 | memcpy(gitdir + len, "/.git/", 7); | |
362 | ||
363 | retval = resolve_gitlink_ref_recursive(gitdir, len+6, refname, result, 0); | |
364 | free(gitdir); | |
365 | return retval; | |
366 | } | |
ca8db142 | 367 | |
8da19775 | 368 | const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 369 | { |
a876ed83 JH |
370 | int depth = MAXDEPTH, len; |
371 | char buffer[256]; | |
ed378ec7 | 372 | static char ref_buffer[256]; |
ca8db142 | 373 | |
8da19775 JH |
374 | if (flag) |
375 | *flag = 0; | |
376 | ||
a876ed83 | 377 | for (;;) { |
ed378ec7 | 378 | const char *path = git_path("%s", ref); |
a876ed83 JH |
379 | struct stat st; |
380 | char *buf; | |
381 | int fd; | |
8a65ff76 | 382 | |
a876ed83 JH |
383 | if (--depth < 0) |
384 | return NULL; | |
ca8db142 | 385 | |
a876ed83 JH |
386 | /* Special case: non-existing file. |
387 | * Not having the refs/heads/new-branch is OK | |
388 | * if we are writing into it, so is .git/HEAD | |
389 | * that points at refs/heads/master still to be | |
390 | * born. It is NOT OK if we are resolving for | |
391 | * reading. | |
392 | */ | |
393 | if (lstat(path, &st) < 0) { | |
434cd0cd LT |
394 | struct ref_list *list = get_packed_refs(); |
395 | while (list) { | |
f4204ab9 | 396 | if (!strcmp(ref, list->name)) { |
434cd0cd | 397 | hashcpy(sha1, list->sha1); |
8da19775 JH |
398 | if (flag) |
399 | *flag |= REF_ISPACKED; | |
434cd0cd LT |
400 | return ref; |
401 | } | |
402 | list = list->next; | |
403 | } | |
a876ed83 JH |
404 | if (reading || errno != ENOENT) |
405 | return NULL; | |
e702496e | 406 | hashclr(sha1); |
ed378ec7 | 407 | return ref; |
a876ed83 | 408 | } |
ca8db142 | 409 | |
a876ed83 JH |
410 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
411 | if (S_ISLNK(st.st_mode)) { | |
412 | len = readlink(path, buffer, sizeof(buffer)-1); | |
413 | if (len >= 5 && !memcmp("refs/", buffer, 5)) { | |
ed378ec7 LT |
414 | buffer[len] = 0; |
415 | strcpy(ref_buffer, buffer); | |
416 | ref = ref_buffer; | |
8da19775 JH |
417 | if (flag) |
418 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
419 | continue; |
420 | } | |
ca8db142 | 421 | } |
a876ed83 | 422 | |
7a21632f DS |
423 | /* Is it a directory? */ |
424 | if (S_ISDIR(st.st_mode)) { | |
425 | errno = EISDIR; | |
426 | return NULL; | |
427 | } | |
428 | ||
a876ed83 JH |
429 | /* |
430 | * Anything else, just open it and try to use it as | |
431 | * a ref | |
432 | */ | |
433 | fd = open(path, O_RDONLY); | |
434 | if (fd < 0) | |
435 | return NULL; | |
93d26e4c | 436 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
a876ed83 JH |
437 | close(fd); |
438 | ||
439 | /* | |
440 | * Is it a symbolic ref? | |
441 | */ | |
442 | if (len < 4 || memcmp("ref:", buffer, 4)) | |
443 | break; | |
444 | buf = buffer + 4; | |
445 | len -= 4; | |
446 | while (len && isspace(*buf)) | |
447 | buf++, len--; | |
448 | while (len && isspace(buf[len-1])) | |
ed378ec7 LT |
449 | len--; |
450 | buf[len] = 0; | |
451 | memcpy(ref_buffer, buf, len + 1); | |
452 | ref = ref_buffer; | |
8da19775 JH |
453 | if (flag) |
454 | *flag |= REF_ISSYMREF; | |
8a65ff76 | 455 | } |
a876ed83 JH |
456 | if (len < 40 || get_sha1_hex(buffer, sha1)) |
457 | return NULL; | |
ed378ec7 | 458 | return ref; |
a876ed83 JH |
459 | } |
460 | ||
ed378ec7 | 461 | int read_ref(const char *ref, unsigned char *sha1) |
a876ed83 | 462 | { |
8da19775 | 463 | if (resolve_ref(ref, sha1, 1, NULL)) |
a876ed83 JH |
464 | return 0; |
465 | return -1; | |
8a65ff76 LT |
466 | } |
467 | ||
ef06b918 JH |
468 | static int do_one_ref(const char *base, each_ref_fn fn, int trim, |
469 | void *cb_data, struct ref_list *entry) | |
470 | { | |
471 | if (strncmp(base, entry->name, trim)) | |
472 | return 0; | |
473 | if (is_null_sha1(entry->sha1)) | |
474 | return 0; | |
475 | if (!has_sha1_file(entry->sha1)) { | |
476 | error("%s does not point to a valid object!", entry->name); | |
477 | return 0; | |
478 | } | |
479 | return fn(entry->name + trim, entry->sha1, entry->flag, cb_data); | |
480 | } | |
481 | ||
cf0adba7 JH |
482 | int peel_ref(const char *ref, unsigned char *sha1) |
483 | { | |
484 | int flag; | |
485 | unsigned char base[20]; | |
486 | struct object *o; | |
487 | ||
488 | if (!resolve_ref(ref, base, 1, &flag)) | |
489 | return -1; | |
490 | ||
491 | if ((flag & REF_ISPACKED)) { | |
492 | struct ref_list *list = get_packed_refs(); | |
cf0adba7 JH |
493 | |
494 | while (list) { | |
f4204ab9 JH |
495 | if (!strcmp(list->name, ref)) { |
496 | if (list->flag & REF_KNOWS_PEELED) { | |
497 | hashcpy(sha1, list->peeled); | |
498 | return 0; | |
499 | } | |
500 | /* older pack-refs did not leave peeled ones */ | |
501 | break; | |
cf0adba7 JH |
502 | } |
503 | list = list->next; | |
504 | } | |
cf0adba7 JH |
505 | } |
506 | ||
f4204ab9 | 507 | /* fallback - callers should not call this for unpacked refs */ |
cf0adba7 JH |
508 | o = parse_object(base); |
509 | if (o->type == OBJ_TAG) { | |
510 | o = deref_tag(o, ref, 0); | |
511 | if (o) { | |
512 | hashcpy(sha1, o->sha1); | |
513 | return 0; | |
514 | } | |
515 | } | |
516 | return -1; | |
517 | } | |
518 | ||
8da19775 JH |
519 | static int do_for_each_ref(const char *base, each_ref_fn fn, int trim, |
520 | void *cb_data) | |
8a65ff76 | 521 | { |
e1e22e37 LT |
522 | int retval; |
523 | struct ref_list *packed = get_packed_refs(); | |
524 | struct ref_list *loose = get_loose_refs(); | |
8a65ff76 | 525 | |
e1e22e37 LT |
526 | while (packed && loose) { |
527 | struct ref_list *entry; | |
528 | int cmp = strcmp(packed->name, loose->name); | |
529 | if (!cmp) { | |
530 | packed = packed->next; | |
531 | continue; | |
6cada6a9 | 532 | } |
e1e22e37 LT |
533 | if (cmp > 0) { |
534 | entry = loose; | |
535 | loose = loose->next; | |
536 | } else { | |
537 | entry = packed; | |
538 | packed = packed->next; | |
539 | } | |
ef06b918 | 540 | retval = do_one_ref(base, fn, trim, cb_data, entry); |
e1e22e37 LT |
541 | if (retval) |
542 | return retval; | |
543 | } | |
8a65ff76 | 544 | |
ef06b918 JH |
545 | for (packed = packed ? packed : loose; packed; packed = packed->next) { |
546 | retval = do_one_ref(base, fn, trim, cb_data, packed); | |
547 | if (retval) | |
548 | return retval; | |
8a65ff76 | 549 | } |
e1e22e37 | 550 | return 0; |
8a65ff76 LT |
551 | } |
552 | ||
cb5d709f | 553 | int head_ref(each_ref_fn fn, void *cb_data) |
723c31fe LT |
554 | { |
555 | unsigned char sha1[20]; | |
8da19775 JH |
556 | int flag; |
557 | ||
558 | if (resolve_ref("HEAD", sha1, 1, &flag)) | |
559 | return fn("HEAD", sha1, flag, cb_data); | |
2f34ba32 | 560 | return 0; |
723c31fe LT |
561 | } |
562 | ||
cb5d709f | 563 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 564 | { |
cb5d709f | 565 | return do_for_each_ref("refs/", fn, 0, cb_data); |
a62be77f SE |
566 | } |
567 | ||
cb5d709f | 568 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 569 | { |
cb5d709f | 570 | return do_for_each_ref("refs/tags/", fn, 10, cb_data); |
a62be77f SE |
571 | } |
572 | ||
cb5d709f | 573 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 574 | { |
cb5d709f | 575 | return do_for_each_ref("refs/heads/", fn, 11, cb_data); |
a62be77f SE |
576 | } |
577 | ||
cb5d709f | 578 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 579 | { |
cb5d709f | 580 | return do_for_each_ref("refs/remotes/", fn, 13, cb_data); |
8a65ff76 LT |
581 | } |
582 | ||
03feddd6 JH |
583 | /* |
584 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
585 | * We do not like it if: | |
586 | * | |
587 | * - any path component of it begins with ".", or | |
588 | * - it has double dots "..", or | |
589 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
590 | * - it ends with a "/". | |
591 | */ | |
592 | ||
593 | static inline int bad_ref_char(int ch) | |
594 | { | |
8558fd9e DB |
595 | if (((unsigned) ch) <= ' ' || |
596 | ch == '~' || ch == '^' || ch == ':') | |
597 | return 1; | |
598 | /* 2.13 Pattern Matching Notation */ | |
599 | if (ch == '?' || ch == '[') /* Unsupported */ | |
600 | return 1; | |
601 | if (ch == '*') /* Supported at the end */ | |
602 | return 2; | |
603 | return 0; | |
03feddd6 JH |
604 | } |
605 | ||
95fc7512 DB |
606 | int check_ref_format(const char *ref) |
607 | { | |
8558fd9e | 608 | int ch, level, bad_type; |
03feddd6 JH |
609 | const char *cp = ref; |
610 | ||
611 | level = 0; | |
612 | while (1) { | |
613 | while ((ch = *cp++) == '/') | |
614 | ; /* tolerate duplicated slashes */ | |
615 | if (!ch) | |
5f7b202a JH |
616 | /* should not end with slashes */ |
617 | return CHECK_REF_FORMAT_ERROR; | |
03feddd6 JH |
618 | |
619 | /* we are at the beginning of the path component */ | |
8558fd9e | 620 | if (ch == '.') |
5f7b202a | 621 | return CHECK_REF_FORMAT_ERROR; |
8558fd9e DB |
622 | bad_type = bad_ref_char(ch); |
623 | if (bad_type) { | |
5f7b202a JH |
624 | return (bad_type == 2 && !*cp) |
625 | ? CHECK_REF_FORMAT_WILDCARD | |
626 | : CHECK_REF_FORMAT_ERROR; | |
8558fd9e | 627 | } |
03feddd6 JH |
628 | |
629 | /* scan the rest of the path component */ | |
630 | while ((ch = *cp++) != 0) { | |
8558fd9e DB |
631 | bad_type = bad_ref_char(ch); |
632 | if (bad_type) { | |
5f7b202a JH |
633 | return (bad_type == 2 && !*cp) |
634 | ? CHECK_REF_FORMAT_WILDCARD | |
635 | : CHECK_REF_FORMAT_ERROR; | |
8558fd9e | 636 | } |
03feddd6 JH |
637 | if (ch == '/') |
638 | break; | |
639 | if (ch == '.' && *cp == '.') | |
5f7b202a | 640 | return CHECK_REF_FORMAT_ERROR; |
03feddd6 JH |
641 | } |
642 | level++; | |
643 | if (!ch) { | |
644 | if (level < 2) | |
5f7b202a JH |
645 | return CHECK_REF_FORMAT_ONELEVEL; |
646 | return CHECK_REF_FORMAT_OK; | |
03feddd6 JH |
647 | } |
648 | } | |
95fc7512 DB |
649 | } |
650 | ||
79803322 SP |
651 | const char *ref_rev_parse_rules[] = { |
652 | "%.*s", | |
653 | "refs/%.*s", | |
654 | "refs/tags/%.*s", | |
655 | "refs/heads/%.*s", | |
656 | "refs/remotes/%.*s", | |
657 | "refs/remotes/%.*s/HEAD", | |
658 | NULL | |
659 | }; | |
660 | ||
605b4978 SP |
661 | const char *ref_fetch_rules[] = { |
662 | "%.*s", | |
663 | "refs/%.*s", | |
664 | "refs/heads/%.*s", | |
665 | NULL | |
666 | }; | |
667 | ||
79803322 SP |
668 | int refname_match(const char *abbrev_name, const char *full_name, const char **rules) |
669 | { | |
670 | const char **p; | |
671 | const int abbrev_name_len = strlen(abbrev_name); | |
672 | ||
673 | for (p = rules; *p; p++) { | |
674 | if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { | |
675 | return 1; | |
676 | } | |
677 | } | |
678 | ||
679 | return 0; | |
680 | } | |
681 | ||
e5f38ec3 | 682 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
683 | const unsigned char *old_sha1, int mustexist) |
684 | { | |
8da19775 | 685 | if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 686 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
687 | unlock_ref(lock); |
688 | return NULL; | |
689 | } | |
a89fccd2 | 690 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 691 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
692 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
693 | unlock_ref(lock); | |
694 | return NULL; | |
695 | } | |
696 | return lock; | |
697 | } | |
698 | ||
7155b727 | 699 | static int remove_empty_directories(const char *file) |
bc7127ef JH |
700 | { |
701 | /* we want to create a file but there is a directory there; | |
702 | * if that is an empty directory (or a directory that contains | |
703 | * only empty directories), remove them. | |
704 | */ | |
7155b727 JS |
705 | struct strbuf path; |
706 | int result; | |
bc7127ef | 707 | |
7155b727 JS |
708 | strbuf_init(&path, 20); |
709 | strbuf_addstr(&path, file); | |
710 | ||
711 | result = remove_dir_recursively(&path, 1); | |
712 | ||
713 | strbuf_release(&path); | |
714 | ||
715 | return result; | |
bc7127ef JH |
716 | } |
717 | ||
c976d415 LH |
718 | static int is_refname_available(const char *ref, const char *oldref, |
719 | struct ref_list *list, int quiet) | |
720 | { | |
721 | int namlen = strlen(ref); /* e.g. 'foo/bar' */ | |
722 | while (list) { | |
723 | /* list->name could be 'foo' or 'foo/bar/baz' */ | |
724 | if (!oldref || strcmp(oldref, list->name)) { | |
725 | int len = strlen(list->name); | |
726 | int cmplen = (namlen < len) ? namlen : len; | |
727 | const char *lead = (namlen < len) ? list->name : ref; | |
728 | if (!strncmp(ref, list->name, cmplen) && | |
729 | lead[cmplen] == '/') { | |
730 | if (!quiet) | |
731 | error("'%s' exists; cannot create '%s'", | |
732 | list->name, ref); | |
733 | return 0; | |
734 | } | |
735 | } | |
736 | list = list->next; | |
737 | } | |
738 | return 1; | |
739 | } | |
740 | ||
68db31cc | 741 | static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p) |
4bd18c43 | 742 | { |
434cd0cd | 743 | char *ref_file; |
ed378ec7 | 744 | const char *orig_ref = ref; |
4bd18c43 | 745 | struct ref_lock *lock; |
732232a1 | 746 | struct stat st; |
5cc3cef9 | 747 | int last_errno = 0; |
68db31cc | 748 | int type; |
4431fcc4 | 749 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
4bd18c43 SP |
750 | |
751 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
752 | lock->lock_fd = -1; | |
753 | ||
68db31cc | 754 | ref = resolve_ref(ref, lock->old_sha1, mustexist, &type); |
bc7127ef JH |
755 | if (!ref && errno == EISDIR) { |
756 | /* we are trying to lock foo but we used to | |
757 | * have foo/bar which now does not exist; | |
758 | * it is normal for the empty directory 'foo' | |
759 | * to remain. | |
760 | */ | |
761 | ref_file = git_path("%s", orig_ref); | |
5cc3cef9 JH |
762 | if (remove_empty_directories(ref_file)) { |
763 | last_errno = errno; | |
764 | error("there are still refs under '%s'", orig_ref); | |
765 | goto error_return; | |
766 | } | |
68db31cc | 767 | ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type); |
bc7127ef | 768 | } |
68db31cc SV |
769 | if (type_p) |
770 | *type_p = type; | |
ed378ec7 | 771 | if (!ref) { |
5cc3cef9 | 772 | last_errno = errno; |
818f477c | 773 | error("unable to resolve reference %s: %s", |
ed378ec7 | 774 | orig_ref, strerror(errno)); |
5cc3cef9 | 775 | goto error_return; |
4bd18c43 | 776 | } |
c976d415 LH |
777 | /* When the ref did not exist and we are creating it, |
778 | * make sure there is no existing ref that is packed | |
779 | * whose name begins with our refname, nor a ref whose | |
780 | * name is a proper prefix of our refname. | |
781 | */ | |
782 | if (is_null_sha1(lock->old_sha1) && | |
783 | !is_refname_available(ref, NULL, get_packed_refs(), 0)) | |
784 | goto error_return; | |
22a3844e | 785 | |
c33d5174 | 786 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 787 | |
68db31cc SV |
788 | if (flags & REF_NODEREF) |
789 | ref = orig_ref; | |
434cd0cd | 790 | lock->ref_name = xstrdup(ref); |
1655707c | 791 | lock->orig_ref_name = xstrdup(orig_ref); |
7c1a278d | 792 | ref_file = git_path("%s", ref); |
68db31cc SV |
793 | if (lstat(ref_file, &st) && errno == ENOENT) |
794 | lock->force_write = 1; | |
795 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
796 | lock->force_write = 1; | |
4bd18c43 | 797 | |
5cc3cef9 JH |
798 | if (safe_create_leading_directories(ref_file)) { |
799 | last_errno = errno; | |
800 | error("unable to create directory for %s", ref_file); | |
801 | goto error_return; | |
802 | } | |
434cd0cd | 803 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, 1); |
4bd18c43 SP |
804 | |
805 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; | |
5cc3cef9 JH |
806 | |
807 | error_return: | |
808 | unlock_ref(lock); | |
809 | errno = last_errno; | |
810 | return NULL; | |
4bd18c43 SP |
811 | } |
812 | ||
4431fcc4 | 813 | struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1) |
95fc7512 | 814 | { |
53cce84c | 815 | char refpath[PATH_MAX]; |
95fc7512 | 816 | if (check_ref_format(ref)) |
4bd18c43 | 817 | return NULL; |
53cce84c | 818 | strcpy(refpath, mkpath("refs/%s", ref)); |
68db31cc | 819 | return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL); |
4bd18c43 SP |
820 | } |
821 | ||
68db31cc | 822 | struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags) |
4bd18c43 | 823 | { |
5f7b202a | 824 | switch (check_ref_format(ref)) { |
5f7b202a | 825 | default: |
257f3020 JH |
826 | return NULL; |
827 | case 0: | |
828 | case CHECK_REF_FORMAT_ONELEVEL: | |
5f7b202a JH |
829 | return lock_ref_sha1_basic(ref, old_sha1, flags, NULL); |
830 | } | |
c0277d15 JH |
831 | } |
832 | ||
26a063a1 JH |
833 | static struct lock_file packlock; |
834 | ||
c0277d15 JH |
835 | static int repack_without_ref(const char *refname) |
836 | { | |
837 | struct ref_list *list, *packed_ref_list; | |
838 | int fd; | |
839 | int found = 0; | |
c0277d15 JH |
840 | |
841 | packed_ref_list = get_packed_refs(); | |
842 | for (list = packed_ref_list; list; list = list->next) { | |
843 | if (!strcmp(refname, list->name)) { | |
844 | found = 1; | |
845 | break; | |
846 | } | |
847 | } | |
848 | if (!found) | |
849 | return 0; | |
c0277d15 JH |
850 | fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0); |
851 | if (fd < 0) | |
852 | return error("cannot delete '%s' from packed refs", refname); | |
853 | ||
854 | for (list = packed_ref_list; list; list = list->next) { | |
855 | char line[PATH_MAX + 100]; | |
856 | int len; | |
857 | ||
858 | if (!strcmp(refname, list->name)) | |
859 | continue; | |
860 | len = snprintf(line, sizeof(line), "%s %s\n", | |
861 | sha1_to_hex(list->sha1), list->name); | |
862 | /* this should not happen but just being defensive */ | |
863 | if (len > sizeof(line)) | |
864 | die("too long a refname '%s'", list->name); | |
865 | write_or_die(fd, line, len); | |
866 | } | |
867 | return commit_lock_file(&packlock); | |
868 | } | |
869 | ||
1401f46b | 870 | int delete_ref(const char *refname, const unsigned char *sha1) |
c0277d15 JH |
871 | { |
872 | struct ref_lock *lock; | |
873 | int err, i, ret = 0, flag = 0; | |
874 | ||
68db31cc | 875 | lock = lock_ref_sha1_basic(refname, sha1, 0, &flag); |
c0277d15 JH |
876 | if (!lock) |
877 | return 1; | |
878 | if (!(flag & REF_ISPACKED)) { | |
879 | /* loose */ | |
880 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
881 | lock->lk->filename[i] = 0; | |
882 | err = unlink(lock->lk->filename); | |
883 | if (err) { | |
884 | ret = 1; | |
885 | error("unlink(%s) failed: %s", | |
886 | lock->lk->filename, strerror(errno)); | |
887 | } | |
888 | lock->lk->filename[i] = '.'; | |
889 | } | |
890 | /* removing the loose one could have resurrected an earlier | |
891 | * packed one. Also, if it was not loose we need to repack | |
892 | * without it. | |
893 | */ | |
894 | ret |= repack_without_ref(refname); | |
895 | ||
9a13f0b7 | 896 | err = unlink(git_path("logs/%s", lock->ref_name)); |
c0277d15 JH |
897 | if (err && errno != ENOENT) |
898 | fprintf(stderr, "warning: unlink(%s) failed: %s", | |
9a13f0b7 | 899 | git_path("logs/%s", lock->ref_name), strerror(errno)); |
c0277d15 JH |
900 | invalidate_cached_refs(); |
901 | unlock_ref(lock); | |
902 | return ret; | |
4bd18c43 SP |
903 | } |
904 | ||
678d0f4c | 905 | int rename_ref(const char *oldref, const char *newref, const char *logmsg) |
c976d415 LH |
906 | { |
907 | static const char renamed_ref[] = "RENAMED-REF"; | |
908 | unsigned char sha1[20], orig_sha1[20]; | |
909 | int flag = 0, logmoved = 0; | |
910 | struct ref_lock *lock; | |
c976d415 | 911 | struct stat loginfo; |
16c2bfbb | 912 | int log = !lstat(git_path("logs/%s", oldref), &loginfo); |
c976d415 LH |
913 | |
914 | if (S_ISLNK(loginfo.st_mode)) | |
915 | return error("reflog for %s is a symlink", oldref); | |
916 | ||
917 | if (!resolve_ref(oldref, orig_sha1, 1, &flag)) | |
918 | return error("refname %s not found", oldref); | |
919 | ||
920 | if (!is_refname_available(newref, oldref, get_packed_refs(), 0)) | |
921 | return 1; | |
922 | ||
923 | if (!is_refname_available(newref, oldref, get_loose_refs(), 0)) | |
924 | return 1; | |
925 | ||
68db31cc | 926 | lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL); |
c976d415 LH |
927 | if (!lock) |
928 | return error("unable to lock %s", renamed_ref); | |
929 | lock->force_write = 1; | |
678d0f4c | 930 | if (write_ref_sha1(lock, orig_sha1, logmsg)) |
c976d415 LH |
931 | return error("unable to save current sha1 in %s", renamed_ref); |
932 | ||
933 | if (log && rename(git_path("logs/%s", oldref), git_path("tmp-renamed-log"))) | |
934 | return error("unable to move logfile logs/%s to tmp-renamed-log: %s", | |
935 | oldref, strerror(errno)); | |
936 | ||
937 | if (delete_ref(oldref, orig_sha1)) { | |
938 | error("unable to delete old %s", oldref); | |
939 | goto rollback; | |
940 | } | |
941 | ||
942 | if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1)) { | |
943 | if (errno==EISDIR) { | |
944 | if (remove_empty_directories(git_path("%s", newref))) { | |
945 | error("Directory not empty: %s", newref); | |
946 | goto rollback; | |
947 | } | |
948 | } else { | |
949 | error("unable to delete existing %s", newref); | |
950 | goto rollback; | |
951 | } | |
952 | } | |
953 | ||
954 | if (log && safe_create_leading_directories(git_path("logs/%s", newref))) { | |
955 | error("unable to create directory for %s", newref); | |
956 | goto rollback; | |
957 | } | |
958 | ||
959 | retry: | |
960 | if (log && rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref))) { | |
d9e74d57 JR |
961 | if (errno==EISDIR || errno==ENOTDIR) { |
962 | /* | |
963 | * rename(a, b) when b is an existing | |
964 | * directory ought to result in ISDIR, but | |
965 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
966 | */ | |
c976d415 LH |
967 | if (remove_empty_directories(git_path("logs/%s", newref))) { |
968 | error("Directory not empty: logs/%s", newref); | |
969 | goto rollback; | |
970 | } | |
971 | goto retry; | |
972 | } else { | |
973 | error("unable to move logfile tmp-renamed-log to logs/%s: %s", | |
974 | newref, strerror(errno)); | |
975 | goto rollback; | |
976 | } | |
977 | } | |
978 | logmoved = log; | |
979 | ||
68db31cc | 980 | lock = lock_ref_sha1_basic(newref, NULL, 0, NULL); |
c976d415 LH |
981 | if (!lock) { |
982 | error("unable to lock %s for update", newref); | |
983 | goto rollback; | |
984 | } | |
985 | ||
986 | lock->force_write = 1; | |
987 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 988 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
c976d415 LH |
989 | error("unable to write current sha1 into %s", newref); |
990 | goto rollback; | |
991 | } | |
992 | ||
993 | return 0; | |
994 | ||
995 | rollback: | |
68db31cc | 996 | lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL); |
c976d415 LH |
997 | if (!lock) { |
998 | error("unable to lock %s for rollback", oldref); | |
999 | goto rollbacklog; | |
1000 | } | |
1001 | ||
1002 | lock->force_write = 1; | |
1003 | flag = log_all_ref_updates; | |
1004 | log_all_ref_updates = 0; | |
1005 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
1006 | error("unable to write current sha1 into %s", oldref); | |
1007 | log_all_ref_updates = flag; | |
1008 | ||
1009 | rollbacklog: | |
1010 | if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref))) | |
1011 | error("unable to restore logfile %s from %s: %s", | |
1012 | oldref, newref, strerror(errno)); | |
1013 | if (!logmoved && log && | |
1014 | rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref))) | |
1015 | error("unable to restore logfile %s from tmp-renamed-log: %s", | |
1016 | oldref, strerror(errno)); | |
1017 | ||
1018 | return 1; | |
1019 | } | |
1020 | ||
435fc852 | 1021 | int close_ref(struct ref_lock *lock) |
b531394d BC |
1022 | { |
1023 | if (close_lock_file(lock->lk)) | |
1024 | return -1; | |
1025 | lock->lock_fd = -1; | |
1026 | return 0; | |
1027 | } | |
1028 | ||
435fc852 | 1029 | int commit_ref(struct ref_lock *lock) |
b531394d BC |
1030 | { |
1031 | if (commit_lock_file(lock->lk)) | |
1032 | return -1; | |
1033 | lock->lock_fd = -1; | |
1034 | return 0; | |
1035 | } | |
1036 | ||
e5f38ec3 | 1037 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 | 1038 | { |
4ed7cd3a BC |
1039 | /* Do not free lock->lk -- atexit() still looks at them */ |
1040 | if (lock->lk) | |
1041 | rollback_lock_file(lock->lk); | |
434cd0cd | 1042 | free(lock->ref_name); |
1655707c | 1043 | free(lock->orig_ref_name); |
4bd18c43 SP |
1044 | free(lock); |
1045 | } | |
1046 | ||
0ec29a47 JH |
1047 | /* |
1048 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
1049 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
1050 | * because reflog file is one line per entry. | |
1051 | */ | |
1052 | static int copy_msg(char *buf, const char *msg) | |
1053 | { | |
1054 | char *cp = buf; | |
1055 | char c; | |
1056 | int wasspace = 1; | |
1057 | ||
1058 | *cp++ = '\t'; | |
1059 | while ((c = *msg++)) { | |
1060 | if (wasspace && isspace(c)) | |
1061 | continue; | |
1062 | wasspace = isspace(c); | |
1063 | if (wasspace) | |
1064 | c = ' '; | |
1065 | *cp++ = c; | |
1066 | } | |
1067 | while (buf < cp && isspace(cp[-1])) | |
1068 | cp--; | |
1069 | *cp++ = '\n'; | |
1070 | return cp - buf; | |
1071 | } | |
1072 | ||
9a13f0b7 NP |
1073 | static int log_ref_write(const char *ref_name, const unsigned char *old_sha1, |
1074 | const unsigned char *new_sha1, const char *msg) | |
6de08ae6 SP |
1075 | { |
1076 | int logfd, written, oflags = O_APPEND | O_WRONLY; | |
1077 | unsigned maxlen, len; | |
8ac65937 | 1078 | int msglen; |
9a13f0b7 | 1079 | char *log_file, *logrec; |
ff4c8485 | 1080 | const char *committer; |
6de08ae6 | 1081 | |
510c5a8e | 1082 | if (log_all_ref_updates < 0) |
7d1864ce | 1083 | log_all_ref_updates = !is_bare_repository(); |
510c5a8e | 1084 | |
9a13f0b7 NP |
1085 | log_file = git_path("logs/%s", ref_name); |
1086 | ||
4057deb5 | 1087 | if (log_all_ref_updates && |
cc44c765 JH |
1088 | (!prefixcmp(ref_name, "refs/heads/") || |
1089 | !prefixcmp(ref_name, "refs/remotes/") || | |
bd104db1 | 1090 | !strcmp(ref_name, "HEAD"))) { |
9a13f0b7 | 1091 | if (safe_create_leading_directories(log_file) < 0) |
6de08ae6 | 1092 | return error("unable to create directory for %s", |
9a13f0b7 | 1093 | log_file); |
6de08ae6 SP |
1094 | oflags |= O_CREAT; |
1095 | } | |
1096 | ||
9a13f0b7 | 1097 | logfd = open(log_file, oflags, 0666); |
6de08ae6 | 1098 | if (logfd < 0) { |
1974bf62 | 1099 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 1100 | return 0; |
3b463c3f JH |
1101 | |
1102 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
9a13f0b7 | 1103 | if (remove_empty_directories(log_file)) { |
3b463c3f | 1104 | return error("There are still logs under '%s'", |
9a13f0b7 | 1105 | log_file); |
3b463c3f | 1106 | } |
9a13f0b7 | 1107 | logfd = open(log_file, oflags, 0666); |
3b463c3f JH |
1108 | } |
1109 | ||
1110 | if (logfd < 0) | |
1111 | return error("Unable to append to %s: %s", | |
9a13f0b7 | 1112 | log_file, strerror(errno)); |
6de08ae6 SP |
1113 | } |
1114 | ||
443b92b6 MK |
1115 | adjust_shared_perm(log_file); |
1116 | ||
0ec29a47 | 1117 | msglen = msg ? strlen(msg) : 0; |
774751a8 | 1118 | committer = git_committer_info(0); |
8ac65937 JH |
1119 | maxlen = strlen(committer) + msglen + 100; |
1120 | logrec = xmalloc(maxlen); | |
1121 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
1122 | sha1_to_hex(old_sha1), |
1123 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
1124 | committer); |
1125 | if (msglen) | |
0ec29a47 | 1126 | len += copy_msg(logrec + len - 1, msg) - 1; |
93822c22 | 1127 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 | 1128 | free(logrec); |
91c8d590 | 1129 | if (close(logfd) != 0 || written != len) |
9a13f0b7 | 1130 | return error("Unable to append to %s", log_file); |
6de08ae6 SP |
1131 | return 0; |
1132 | } | |
1133 | ||
c3b0dec5 LT |
1134 | static int is_branch(const char *refname) |
1135 | { | |
1136 | return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/"); | |
1137 | } | |
1138 | ||
4bd18c43 SP |
1139 | int write_ref_sha1(struct ref_lock *lock, |
1140 | const unsigned char *sha1, const char *logmsg) | |
1141 | { | |
1142 | static char term = '\n'; | |
c3b0dec5 | 1143 | struct object *o; |
4bd18c43 SP |
1144 | |
1145 | if (!lock) | |
95fc7512 | 1146 | return -1; |
a89fccd2 | 1147 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
1148 | unlock_ref(lock); |
1149 | return 0; | |
95fc7512 | 1150 | } |
c3b0dec5 LT |
1151 | o = parse_object(sha1); |
1152 | if (!o) { | |
1153 | error("Trying to write ref %s with nonexistant object %s", | |
1154 | lock->ref_name, sha1_to_hex(sha1)); | |
1155 | unlock_ref(lock); | |
1156 | return -1; | |
1157 | } | |
1158 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1159 | error("Trying to write non-commit object %s to branch %s", | |
1160 | sha1_to_hex(sha1), lock->ref_name); | |
1161 | unlock_ref(lock); | |
1162 | return -1; | |
1163 | } | |
93822c22 AW |
1164 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
1165 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
b531394d | 1166 | || close_ref(lock) < 0) { |
c33d5174 | 1167 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
1168 | unlock_ref(lock); |
1169 | return -1; | |
1170 | } | |
5e290ff7 | 1171 | invalidate_cached_refs(); |
bd104db1 NP |
1172 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
1173 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
1174 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
1175 | unlock_ref(lock); |
1176 | return -1; | |
1177 | } | |
605fac8b NP |
1178 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
1179 | /* | |
1180 | * Special hack: If a branch is updated directly and HEAD | |
1181 | * points to it (may happen on the remote side of a push | |
1182 | * for example) then logically the HEAD reflog should be | |
1183 | * updated too. | |
1184 | * A generic solution implies reverse symref information, | |
1185 | * but finding all symrefs pointing to the given branch | |
1186 | * would be rather costly for this rare event (the direct | |
1187 | * update of a branch) to be worth it. So let's cheat and | |
1188 | * check with HEAD only which should cover 99% of all usage | |
1189 | * scenarios (even 100% of the default ones). | |
1190 | */ | |
1191 | unsigned char head_sha1[20]; | |
1192 | int head_flag; | |
1193 | const char *head_ref; | |
1194 | head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag); | |
1195 | if (head_ref && (head_flag & REF_ISSYMREF) && | |
1196 | !strcmp(head_ref, lock->ref_name)) | |
1197 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
1198 | } | |
b531394d | 1199 | if (commit_ref(lock)) { |
434cd0cd | 1200 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
1201 | unlock_ref(lock); |
1202 | return -1; | |
1203 | } | |
4bd18c43 SP |
1204 | unlock_ref(lock); |
1205 | return 0; | |
95fc7512 | 1206 | } |
d556fae2 | 1207 | |
8b5157e4 NP |
1208 | int create_symref(const char *ref_target, const char *refs_heads_master, |
1209 | const char *logmsg) | |
41b625b0 NP |
1210 | { |
1211 | const char *lockpath; | |
1212 | char ref[1000]; | |
1213 | int fd, len, written; | |
47fc52e2 | 1214 | char *git_HEAD = xstrdup(git_path("%s", ref_target)); |
8b5157e4 NP |
1215 | unsigned char old_sha1[20], new_sha1[20]; |
1216 | ||
1217 | if (logmsg && read_ref(ref_target, old_sha1)) | |
1218 | hashclr(old_sha1); | |
41b625b0 | 1219 | |
d48744d1 JH |
1220 | if (safe_create_leading_directories(git_HEAD) < 0) |
1221 | return error("unable to create directory for %s", git_HEAD); | |
1222 | ||
41b625b0 NP |
1223 | #ifndef NO_SYMLINK_HEAD |
1224 | if (prefer_symlink_refs) { | |
1225 | unlink(git_HEAD); | |
1226 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 1227 | goto done; |
41b625b0 NP |
1228 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
1229 | } | |
1230 | #endif | |
1231 | ||
1232 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
1233 | if (sizeof(ref) <= len) { | |
1234 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 1235 | goto error_free_return; |
41b625b0 NP |
1236 | } |
1237 | lockpath = mkpath("%s.lock", git_HEAD); | |
1238 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
1239 | if (fd < 0) { | |
1240 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 1241 | goto error_free_return; |
41b625b0 NP |
1242 | } |
1243 | written = write_in_full(fd, ref, len); | |
91c8d590 | 1244 | if (close(fd) != 0 || written != len) { |
41b625b0 | 1245 | error("Unable to write to %s", lockpath); |
47fc52e2 | 1246 | goto error_unlink_return; |
41b625b0 NP |
1247 | } |
1248 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 1249 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 1250 | goto error_unlink_return; |
41b625b0 NP |
1251 | } |
1252 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 1253 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 JH |
1254 | error_unlink_return: |
1255 | unlink(lockpath); | |
1256 | error_free_return: | |
1257 | free(git_HEAD); | |
1258 | return -1; | |
41b625b0 | 1259 | } |
8b5157e4 | 1260 | |
ee96d11b | 1261 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 1262 | done: |
ee96d11b | 1263 | #endif |
8b5157e4 NP |
1264 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
1265 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
1266 | ||
47fc52e2 | 1267 | free(git_HEAD); |
41b625b0 NP |
1268 | return 0; |
1269 | } | |
1270 | ||
16d7cc90 JH |
1271 | static char *ref_msg(const char *line, const char *endp) |
1272 | { | |
1273 | const char *ep; | |
16d7cc90 | 1274 | line += 82; |
182af834 PH |
1275 | ep = memchr(line, '\n', endp - line); |
1276 | if (!ep) | |
1277 | ep = endp; | |
1278 | return xmemdupz(line, ep - line); | |
16d7cc90 JH |
1279 | } |
1280 | ||
1281 | 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 | 1282 | { |
e5229042 | 1283 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 | 1284 | char *tz_c; |
e29cb53a | 1285 | int logfd, tz, reccnt = 0; |
d556fae2 SP |
1286 | struct stat st; |
1287 | unsigned long date; | |
e5229042 | 1288 | unsigned char logged_sha1[20]; |
cb48cb58 | 1289 | void *log_mapped; |
dc49cd76 | 1290 | size_t mapsz; |
d556fae2 SP |
1291 | |
1292 | logfile = git_path("logs/%s", ref); | |
1293 | logfd = open(logfile, O_RDONLY, 0); | |
1294 | if (logfd < 0) | |
1295 | die("Unable to read log %s: %s", logfile, strerror(errno)); | |
1296 | fstat(logfd, &st); | |
1297 | if (!st.st_size) | |
1298 | die("Log %s is empty.", logfile); | |
dc49cd76 SP |
1299 | mapsz = xsize_t(st.st_size); |
1300 | log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0); | |
cb48cb58 | 1301 | logdata = log_mapped; |
d556fae2 SP |
1302 | close(logfd); |
1303 | ||
e5229042 | 1304 | lastrec = NULL; |
d556fae2 SP |
1305 | rec = logend = logdata + st.st_size; |
1306 | while (logdata < rec) { | |
e29cb53a | 1307 | reccnt++; |
d556fae2 SP |
1308 | if (logdata < rec && *(rec-1) == '\n') |
1309 | rec--; | |
e5229042 SP |
1310 | lastgt = NULL; |
1311 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 1312 | rec--; |
e5229042 SP |
1313 | if (*rec == '>') |
1314 | lastgt = rec; | |
1315 | } | |
1316 | if (!lastgt) | |
d556fae2 | 1317 | die("Log %s is corrupt.", logfile); |
e5229042 | 1318 | date = strtoul(lastgt + 1, &tz_c, 10); |
ab2a1a32 | 1319 | if (date <= at_time || cnt == 0) { |
76a44c5c | 1320 | tz = strtoul(tz_c, NULL, 10); |
16d7cc90 JH |
1321 | if (msg) |
1322 | *msg = ref_msg(rec, logend); | |
1323 | if (cutoff_time) | |
1324 | *cutoff_time = date; | |
1325 | if (cutoff_tz) | |
1326 | *cutoff_tz = tz; | |
1327 | if (cutoff_cnt) | |
76a44c5c | 1328 | *cutoff_cnt = reccnt - 1; |
e5229042 SP |
1329 | if (lastrec) { |
1330 | if (get_sha1_hex(lastrec, logged_sha1)) | |
1331 | die("Log %s is corrupt.", logfile); | |
1332 | if (get_sha1_hex(rec + 41, sha1)) | |
1333 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1334 | if (hashcmp(logged_sha1, sha1)) { |
e5229042 SP |
1335 | fprintf(stderr, |
1336 | "warning: Log %s has gap after %s.\n", | |
73013afd | 1337 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 | 1338 | } |
e5f38ec3 JH |
1339 | } |
1340 | else if (date == at_time) { | |
e5229042 SP |
1341 | if (get_sha1_hex(rec + 41, sha1)) |
1342 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
1343 | } |
1344 | else { | |
e5229042 SP |
1345 | if (get_sha1_hex(rec + 41, logged_sha1)) |
1346 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1347 | if (hashcmp(logged_sha1, sha1)) { |
e5229042 SP |
1348 | fprintf(stderr, |
1349 | "warning: Log %s unexpectedly ended on %s.\n", | |
73013afd | 1350 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 SP |
1351 | } |
1352 | } | |
dc49cd76 | 1353 | munmap(log_mapped, mapsz); |
d556fae2 SP |
1354 | return 0; |
1355 | } | |
e5229042 | 1356 | lastrec = rec; |
ab2a1a32 JH |
1357 | if (cnt > 0) |
1358 | cnt--; | |
d556fae2 SP |
1359 | } |
1360 | ||
e5229042 SP |
1361 | rec = logdata; |
1362 | while (rec < logend && *rec != '>' && *rec != '\n') | |
1363 | rec++; | |
1364 | if (rec == logend || *rec == '\n') | |
d556fae2 | 1365 | die("Log %s is corrupt.", logfile); |
e5229042 | 1366 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
1367 | tz = strtoul(tz_c, NULL, 10); |
1368 | if (get_sha1_hex(logdata, sha1)) | |
1369 | die("Log %s is corrupt.", logfile); | |
16d7cc90 JH |
1370 | if (msg) |
1371 | *msg = ref_msg(logdata, logend); | |
dc49cd76 | 1372 | munmap(log_mapped, mapsz); |
16d7cc90 JH |
1373 | |
1374 | if (cutoff_time) | |
1375 | *cutoff_time = date; | |
1376 | if (cutoff_tz) | |
1377 | *cutoff_tz = tz; | |
1378 | if (cutoff_cnt) | |
1379 | *cutoff_cnt = reccnt; | |
1380 | return 1; | |
d556fae2 | 1381 | } |
2ff81662 | 1382 | |
883d60fa | 1383 | int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data) |
2ff81662 JH |
1384 | { |
1385 | const char *logfile; | |
1386 | FILE *logfp; | |
1387 | char buf[1024]; | |
2266bf27 | 1388 | int ret = 0; |
2ff81662 JH |
1389 | |
1390 | logfile = git_path("logs/%s", ref); | |
1391 | logfp = fopen(logfile, "r"); | |
1392 | if (!logfp) | |
883d60fa | 1393 | return -1; |
2ff81662 JH |
1394 | while (fgets(buf, sizeof(buf), logfp)) { |
1395 | unsigned char osha1[20], nsha1[20]; | |
883d60fa JS |
1396 | char *email_end, *message; |
1397 | unsigned long timestamp; | |
2266bf27 | 1398 | int len, tz; |
2ff81662 JH |
1399 | |
1400 | /* old SP new SP name <email> SP time TAB msg LF */ | |
1401 | len = strlen(buf); | |
1402 | if (len < 83 || buf[len-1] != '\n' || | |
1403 | get_sha1_hex(buf, osha1) || buf[40] != ' ' || | |
883d60fa JS |
1404 | get_sha1_hex(buf + 41, nsha1) || buf[81] != ' ' || |
1405 | !(email_end = strchr(buf + 82, '>')) || | |
1406 | email_end[1] != ' ' || | |
1407 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
1408 | !message || message[0] != ' ' || | |
1409 | (message[1] != '+' && message[1] != '-') || | |
1410 | !isdigit(message[2]) || !isdigit(message[3]) || | |
b4dd4856 | 1411 | !isdigit(message[4]) || !isdigit(message[5])) |
2ff81662 | 1412 | continue; /* corrupt? */ |
883d60fa JS |
1413 | email_end[1] = '\0'; |
1414 | tz = strtol(message + 1, NULL, 10); | |
b4dd4856 JS |
1415 | if (message[6] != '\t') |
1416 | message += 6; | |
1417 | else | |
1418 | message += 7; | |
883d60fa JS |
1419 | ret = fn(osha1, nsha1, buf+82, timestamp, tz, message, cb_data); |
1420 | if (ret) | |
2266bf27 | 1421 | break; |
2ff81662 JH |
1422 | } |
1423 | fclose(logfp); | |
2266bf27 | 1424 | return ret; |
2ff81662 | 1425 | } |
e29cb53a | 1426 | |
eb8381c8 NP |
1427 | static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data) |
1428 | { | |
1429 | DIR *dir = opendir(git_path("logs/%s", base)); | |
fcee5a14 | 1430 | int retval = 0; |
eb8381c8 NP |
1431 | |
1432 | if (dir) { | |
1433 | struct dirent *de; | |
1434 | int baselen = strlen(base); | |
1435 | char *log = xmalloc(baselen + 257); | |
1436 | ||
1437 | memcpy(log, base, baselen); | |
1438 | if (baselen && base[baselen-1] != '/') | |
1439 | log[baselen++] = '/'; | |
1440 | ||
1441 | while ((de = readdir(dir)) != NULL) { | |
1442 | struct stat st; | |
1443 | int namelen; | |
1444 | ||
1445 | if (de->d_name[0] == '.') | |
1446 | continue; | |
1447 | namelen = strlen(de->d_name); | |
1448 | if (namelen > 255) | |
1449 | continue; | |
1450 | if (has_extension(de->d_name, ".lock")) | |
1451 | continue; | |
1452 | memcpy(log + baselen, de->d_name, namelen+1); | |
1453 | if (stat(git_path("logs/%s", log), &st) < 0) | |
1454 | continue; | |
1455 | if (S_ISDIR(st.st_mode)) { | |
1456 | retval = do_for_each_reflog(log, fn, cb_data); | |
1457 | } else { | |
1458 | unsigned char sha1[20]; | |
1459 | if (!resolve_ref(log, sha1, 0, NULL)) | |
1460 | retval = error("bad ref for %s", log); | |
1461 | else | |
1462 | retval = fn(log, sha1, 0, cb_data); | |
1463 | } | |
1464 | if (retval) | |
1465 | break; | |
1466 | } | |
1467 | free(log); | |
1468 | closedir(dir); | |
1469 | } | |
acb39f64 | 1470 | else if (*base) |
fcee5a14 | 1471 | return errno; |
eb8381c8 NP |
1472 | return retval; |
1473 | } | |
1474 | ||
1475 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
1476 | { | |
1477 | return do_for_each_reflog("", fn, cb_data); | |
1478 | } | |
3d9f037c CR |
1479 | |
1480 | int update_ref(const char *action, const char *refname, | |
1481 | const unsigned char *sha1, const unsigned char *oldval, | |
1482 | int flags, enum action_on_err onerr) | |
1483 | { | |
1484 | static struct ref_lock *lock; | |
1485 | lock = lock_any_ref_for_update(refname, oldval, flags); | |
1486 | if (!lock) { | |
1487 | const char *str = "Cannot lock the ref '%s'."; | |
1488 | switch (onerr) { | |
1489 | case MSG_ON_ERR: error(str, refname); break; | |
1490 | case DIE_ON_ERR: die(str, refname); break; | |
1491 | case QUIET_ON_ERR: break; | |
1492 | } | |
1493 | return 1; | |
1494 | } | |
1495 | if (write_ref_sha1(lock, sha1, action) < 0) { | |
1496 | const char *str = "Cannot update the ref '%s'."; | |
1497 | switch (onerr) { | |
1498 | case MSG_ON_ERR: error(str, refname); break; | |
1499 | case DIE_ON_ERR: die(str, refname); break; | |
1500 | case QUIET_ON_ERR: break; | |
1501 | } | |
1502 | return 1; | |
1503 | } | |
1504 | return 0; | |
1505 | } | |
cda69f48 JK |
1506 | |
1507 | struct ref *find_ref_by_name(struct ref *list, const char *name) | |
1508 | { | |
1509 | for ( ; list; list = list->next) | |
1510 | if (!strcmp(list->name, name)) | |
1511 | return list; | |
1512 | return NULL; | |
1513 | } |