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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 | 161 | |
e142a3c6 DB |
162 | static struct ref_list *extra_refs; |
163 | ||
5e290ff7 JH |
164 | static void free_ref_list(struct ref_list *list) |
165 | { | |
166 | struct ref_list *next; | |
167 | for ( ; list; list = next) { | |
168 | next = list->next; | |
169 | free(list); | |
170 | } | |
171 | } | |
172 | ||
173 | static void invalidate_cached_refs(void) | |
e1e22e37 | 174 | { |
5e290ff7 JH |
175 | struct cached_refs *ca = &cached_refs; |
176 | ||
177 | if (ca->did_loose && ca->loose) | |
178 | free_ref_list(ca->loose); | |
179 | if (ca->did_packed && ca->packed) | |
180 | free_ref_list(ca->packed); | |
181 | ca->loose = ca->packed = NULL; | |
182 | ca->did_loose = ca->did_packed = 0; | |
183 | } | |
e1e22e37 | 184 | |
f4204ab9 JH |
185 | static void read_packed_refs(FILE *f, struct cached_refs *cached_refs) |
186 | { | |
187 | struct ref_list *list = NULL; | |
188 | struct ref_list *last = NULL; | |
189 | char refline[PATH_MAX]; | |
190 | int flag = REF_ISPACKED; | |
191 | ||
192 | while (fgets(refline, sizeof(refline), f)) { | |
193 | unsigned char sha1[20]; | |
194 | const char *name; | |
195 | static const char header[] = "# pack-refs with:"; | |
196 | ||
197 | if (!strncmp(refline, header, sizeof(header)-1)) { | |
198 | const char *traits = refline + sizeof(header) - 1; | |
199 | if (strstr(traits, " peeled ")) | |
200 | flag |= REF_KNOWS_PEELED; | |
201 | /* perhaps other traits later as well */ | |
202 | continue; | |
203 | } | |
204 | ||
205 | name = parse_ref_line(refline, sha1); | |
206 | if (name) { | |
207 | list = add_ref(name, sha1, flag, list, &last); | |
208 | continue; | |
209 | } | |
210 | if (last && | |
211 | refline[0] == '^' && | |
212 | strlen(refline) == 42 && | |
213 | refline[41] == '\n' && | |
214 | !get_sha1_hex(refline + 1, sha1)) | |
215 | hashcpy(last->peeled, sha1); | |
216 | } | |
c774aab9 | 217 | cached_refs->packed = sort_ref_list(list); |
f4204ab9 JH |
218 | } |
219 | ||
e142a3c6 DB |
220 | void add_extra_ref(const char *name, const unsigned char *sha1, int flag) |
221 | { | |
222 | extra_refs = add_ref(name, sha1, flag, extra_refs, NULL); | |
223 | } | |
224 | ||
225 | void clear_extra_refs(void) | |
226 | { | |
227 | free_ref_list(extra_refs); | |
228 | extra_refs = NULL; | |
229 | } | |
230 | ||
5e290ff7 JH |
231 | static struct ref_list *get_packed_refs(void) |
232 | { | |
233 | if (!cached_refs.did_packed) { | |
e1e22e37 | 234 | FILE *f = fopen(git_path("packed-refs"), "r"); |
f4204ab9 | 235 | cached_refs.packed = NULL; |
e1e22e37 | 236 | if (f) { |
f4204ab9 | 237 | read_packed_refs(f, &cached_refs); |
e1e22e37 | 238 | fclose(f); |
e1e22e37 | 239 | } |
5e290ff7 | 240 | cached_refs.did_packed = 1; |
e1e22e37 | 241 | } |
5e290ff7 | 242 | return cached_refs.packed; |
e1e22e37 LT |
243 | } |
244 | ||
245 | static struct ref_list *get_ref_dir(const char *base, struct ref_list *list) | |
246 | { | |
247 | DIR *dir = opendir(git_path("%s", base)); | |
248 | ||
249 | if (dir) { | |
250 | struct dirent *de; | |
251 | int baselen = strlen(base); | |
ed378ec7 | 252 | char *ref = xmalloc(baselen + 257); |
e1e22e37 | 253 | |
ed378ec7 | 254 | memcpy(ref, base, baselen); |
e1e22e37 | 255 | if (baselen && base[baselen-1] != '/') |
ed378ec7 | 256 | ref[baselen++] = '/'; |
e1e22e37 LT |
257 | |
258 | while ((de = readdir(dir)) != NULL) { | |
259 | unsigned char sha1[20]; | |
260 | struct stat st; | |
8da19775 | 261 | int flag; |
e1e22e37 LT |
262 | int namelen; |
263 | ||
264 | if (de->d_name[0] == '.') | |
265 | continue; | |
266 | namelen = strlen(de->d_name); | |
267 | if (namelen > 255) | |
268 | continue; | |
269 | if (has_extension(de->d_name, ".lock")) | |
270 | continue; | |
ed378ec7 LT |
271 | memcpy(ref + baselen, de->d_name, namelen+1); |
272 | if (stat(git_path("%s", ref), &st) < 0) | |
e1e22e37 LT |
273 | continue; |
274 | if (S_ISDIR(st.st_mode)) { | |
ed378ec7 | 275 | list = get_ref_dir(ref, list); |
e1e22e37 LT |
276 | continue; |
277 | } | |
8da19775 | 278 | if (!resolve_ref(ref, sha1, 1, &flag)) { |
ed378ec7 | 279 | error("%s points nowhere!", ref); |
e1e22e37 LT |
280 | continue; |
281 | } | |
f4204ab9 | 282 | list = add_ref(ref, sha1, flag, list, NULL); |
e1e22e37 | 283 | } |
ed378ec7 | 284 | free(ref); |
e1e22e37 LT |
285 | closedir(dir); |
286 | } | |
c774aab9 | 287 | return sort_ref_list(list); |
e1e22e37 LT |
288 | } |
289 | ||
290 | static struct ref_list *get_loose_refs(void) | |
291 | { | |
5e290ff7 JH |
292 | if (!cached_refs.did_loose) { |
293 | cached_refs.loose = get_ref_dir("refs", NULL); | |
294 | cached_refs.did_loose = 1; | |
e1e22e37 | 295 | } |
5e290ff7 | 296 | return cached_refs.loose; |
e1e22e37 LT |
297 | } |
298 | ||
ca8db142 LT |
299 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
300 | #define MAXDEPTH 5 | |
0ebde32c LT |
301 | #define MAXREFLEN (1024) |
302 | ||
303 | static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result) | |
304 | { | |
305 | FILE *f; | |
306 | struct cached_refs refs; | |
307 | struct ref_list *ref; | |
308 | int retval; | |
309 | ||
310 | strcpy(name + pathlen, "packed-refs"); | |
311 | f = fopen(name, "r"); | |
312 | if (!f) | |
313 | return -1; | |
314 | read_packed_refs(f, &refs); | |
315 | fclose(f); | |
316 | ref = refs.packed; | |
317 | retval = -1; | |
318 | while (ref) { | |
319 | if (!strcmp(ref->name, refname)) { | |
320 | retval = 0; | |
321 | memcpy(result, ref->sha1, 20); | |
322 | break; | |
323 | } | |
324 | ref = ref->next; | |
325 | } | |
326 | free_ref_list(refs.packed); | |
327 | return retval; | |
328 | } | |
329 | ||
330 | static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion) | |
331 | { | |
332 | int fd, len = strlen(refname); | |
333 | char buffer[128], *p; | |
334 | ||
335 | if (recursion > MAXDEPTH || len > MAXREFLEN) | |
336 | return -1; | |
337 | memcpy(name + pathlen, refname, len+1); | |
338 | fd = open(name, O_RDONLY); | |
339 | if (fd < 0) | |
340 | return resolve_gitlink_packed_ref(name, pathlen, refname, result); | |
341 | ||
342 | len = read(fd, buffer, sizeof(buffer)-1); | |
343 | close(fd); | |
344 | if (len < 0) | |
345 | return -1; | |
346 | while (len && isspace(buffer[len-1])) | |
347 | len--; | |
348 | buffer[len] = 0; | |
349 | ||
350 | /* Was it a detached head or an old-fashioned symlink? */ | |
351 | if (!get_sha1_hex(buffer, result)) | |
352 | return 0; | |
353 | ||
354 | /* Symref? */ | |
355 | if (strncmp(buffer, "ref:", 4)) | |
356 | return -1; | |
357 | p = buffer + 4; | |
358 | while (isspace(*p)) | |
359 | p++; | |
360 | ||
361 | return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1); | |
362 | } | |
363 | ||
364 | int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result) | |
365 | { | |
366 | int len = strlen(path), retval; | |
367 | char *gitdir; | |
842abf06 | 368 | const char *tmp; |
0ebde32c LT |
369 | |
370 | while (len && path[len-1] == '/') | |
371 | len--; | |
372 | if (!len) | |
373 | return -1; | |
374 | gitdir = xmalloc(len + MAXREFLEN + 8); | |
375 | memcpy(gitdir, path, len); | |
842abf06 LH |
376 | memcpy(gitdir + len, "/.git", 6); |
377 | len += 5; | |
378 | ||
379 | tmp = read_gitfile_gently(gitdir); | |
380 | if (tmp) { | |
381 | free(gitdir); | |
382 | len = strlen(tmp); | |
383 | gitdir = xmalloc(len + MAXREFLEN + 3); | |
384 | memcpy(gitdir, tmp, len); | |
385 | } | |
386 | gitdir[len] = '/'; | |
387 | gitdir[++len] = '\0'; | |
388 | retval = resolve_gitlink_ref_recursive(gitdir, len, refname, result, 0); | |
0ebde32c LT |
389 | free(gitdir); |
390 | return retval; | |
391 | } | |
ca8db142 | 392 | |
8da19775 | 393 | const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 394 | { |
0104ca09 HO |
395 | int depth = MAXDEPTH; |
396 | ssize_t len; | |
a876ed83 | 397 | char buffer[256]; |
ed378ec7 | 398 | static char ref_buffer[256]; |
ca8db142 | 399 | |
8da19775 JH |
400 | if (flag) |
401 | *flag = 0; | |
402 | ||
a876ed83 | 403 | for (;;) { |
ed378ec7 | 404 | const char *path = git_path("%s", ref); |
a876ed83 JH |
405 | struct stat st; |
406 | char *buf; | |
407 | int fd; | |
8a65ff76 | 408 | |
a876ed83 JH |
409 | if (--depth < 0) |
410 | return NULL; | |
ca8db142 | 411 | |
a876ed83 JH |
412 | /* Special case: non-existing file. |
413 | * Not having the refs/heads/new-branch is OK | |
414 | * if we are writing into it, so is .git/HEAD | |
415 | * that points at refs/heads/master still to be | |
416 | * born. It is NOT OK if we are resolving for | |
417 | * reading. | |
418 | */ | |
419 | if (lstat(path, &st) < 0) { | |
434cd0cd LT |
420 | struct ref_list *list = get_packed_refs(); |
421 | while (list) { | |
f4204ab9 | 422 | if (!strcmp(ref, list->name)) { |
434cd0cd | 423 | hashcpy(sha1, list->sha1); |
8da19775 JH |
424 | if (flag) |
425 | *flag |= REF_ISPACKED; | |
434cd0cd LT |
426 | return ref; |
427 | } | |
428 | list = list->next; | |
429 | } | |
a876ed83 JH |
430 | if (reading || errno != ENOENT) |
431 | return NULL; | |
e702496e | 432 | hashclr(sha1); |
ed378ec7 | 433 | return ref; |
a876ed83 | 434 | } |
ca8db142 | 435 | |
a876ed83 JH |
436 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
437 | if (S_ISLNK(st.st_mode)) { | |
438 | len = readlink(path, buffer, sizeof(buffer)-1); | |
439 | if (len >= 5 && !memcmp("refs/", buffer, 5)) { | |
ed378ec7 LT |
440 | buffer[len] = 0; |
441 | strcpy(ref_buffer, buffer); | |
442 | ref = ref_buffer; | |
8da19775 JH |
443 | if (flag) |
444 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
445 | continue; |
446 | } | |
ca8db142 | 447 | } |
a876ed83 | 448 | |
7a21632f DS |
449 | /* Is it a directory? */ |
450 | if (S_ISDIR(st.st_mode)) { | |
451 | errno = EISDIR; | |
452 | return NULL; | |
453 | } | |
454 | ||
a876ed83 JH |
455 | /* |
456 | * Anything else, just open it and try to use it as | |
457 | * a ref | |
458 | */ | |
459 | fd = open(path, O_RDONLY); | |
460 | if (fd < 0) | |
461 | return NULL; | |
93d26e4c | 462 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
a876ed83 JH |
463 | close(fd); |
464 | ||
465 | /* | |
466 | * Is it a symbolic ref? | |
467 | */ | |
468 | if (len < 4 || memcmp("ref:", buffer, 4)) | |
469 | break; | |
470 | buf = buffer + 4; | |
471 | len -= 4; | |
472 | while (len && isspace(*buf)) | |
473 | buf++, len--; | |
474 | while (len && isspace(buf[len-1])) | |
ed378ec7 LT |
475 | len--; |
476 | buf[len] = 0; | |
477 | memcpy(ref_buffer, buf, len + 1); | |
478 | ref = ref_buffer; | |
8da19775 JH |
479 | if (flag) |
480 | *flag |= REF_ISSYMREF; | |
8a65ff76 | 481 | } |
a876ed83 JH |
482 | if (len < 40 || get_sha1_hex(buffer, sha1)) |
483 | return NULL; | |
ed378ec7 | 484 | return ref; |
a876ed83 JH |
485 | } |
486 | ||
ed378ec7 | 487 | int read_ref(const char *ref, unsigned char *sha1) |
a876ed83 | 488 | { |
8da19775 | 489 | if (resolve_ref(ref, sha1, 1, NULL)) |
a876ed83 JH |
490 | return 0; |
491 | return -1; | |
8a65ff76 LT |
492 | } |
493 | ||
ef06b918 JH |
494 | static int do_one_ref(const char *base, each_ref_fn fn, int trim, |
495 | void *cb_data, struct ref_list *entry) | |
496 | { | |
497 | if (strncmp(base, entry->name, trim)) | |
498 | return 0; | |
499 | if (is_null_sha1(entry->sha1)) | |
500 | return 0; | |
501 | if (!has_sha1_file(entry->sha1)) { | |
502 | error("%s does not point to a valid object!", entry->name); | |
503 | return 0; | |
504 | } | |
0ae91be0 | 505 | current_ref = entry; |
ef06b918 JH |
506 | return fn(entry->name + trim, entry->sha1, entry->flag, cb_data); |
507 | } | |
508 | ||
cf0adba7 JH |
509 | int peel_ref(const char *ref, unsigned char *sha1) |
510 | { | |
511 | int flag; | |
512 | unsigned char base[20]; | |
513 | struct object *o; | |
514 | ||
0ae91be0 SP |
515 | if (current_ref && (current_ref->name == ref |
516 | || !strcmp(current_ref->name, ref))) { | |
517 | if (current_ref->flag & REF_KNOWS_PEELED) { | |
518 | hashcpy(sha1, current_ref->peeled); | |
519 | return 0; | |
520 | } | |
521 | hashcpy(base, current_ref->sha1); | |
522 | goto fallback; | |
523 | } | |
524 | ||
cf0adba7 JH |
525 | if (!resolve_ref(ref, base, 1, &flag)) |
526 | return -1; | |
527 | ||
528 | if ((flag & REF_ISPACKED)) { | |
529 | struct ref_list *list = get_packed_refs(); | |
cf0adba7 JH |
530 | |
531 | while (list) { | |
f4204ab9 JH |
532 | if (!strcmp(list->name, ref)) { |
533 | if (list->flag & REF_KNOWS_PEELED) { | |
534 | hashcpy(sha1, list->peeled); | |
535 | return 0; | |
536 | } | |
537 | /* older pack-refs did not leave peeled ones */ | |
538 | break; | |
cf0adba7 JH |
539 | } |
540 | list = list->next; | |
541 | } | |
cf0adba7 JH |
542 | } |
543 | ||
0ae91be0 | 544 | fallback: |
cf0adba7 | 545 | o = parse_object(base); |
8c87dc77 | 546 | if (o && o->type == OBJ_TAG) { |
cf0adba7 JH |
547 | o = deref_tag(o, ref, 0); |
548 | if (o) { | |
549 | hashcpy(sha1, o->sha1); | |
550 | return 0; | |
551 | } | |
552 | } | |
553 | return -1; | |
554 | } | |
555 | ||
8da19775 JH |
556 | static int do_for_each_ref(const char *base, each_ref_fn fn, int trim, |
557 | void *cb_data) | |
8a65ff76 | 558 | { |
0ae91be0 | 559 | int retval = 0; |
e1e22e37 LT |
560 | struct ref_list *packed = get_packed_refs(); |
561 | struct ref_list *loose = get_loose_refs(); | |
8a65ff76 | 562 | |
e142a3c6 DB |
563 | struct ref_list *extra; |
564 | ||
565 | for (extra = extra_refs; extra; extra = extra->next) | |
566 | retval = do_one_ref(base, fn, trim, cb_data, extra); | |
567 | ||
e1e22e37 LT |
568 | while (packed && loose) { |
569 | struct ref_list *entry; | |
570 | int cmp = strcmp(packed->name, loose->name); | |
571 | if (!cmp) { | |
572 | packed = packed->next; | |
573 | continue; | |
6cada6a9 | 574 | } |
e1e22e37 LT |
575 | if (cmp > 0) { |
576 | entry = loose; | |
577 | loose = loose->next; | |
578 | } else { | |
579 | entry = packed; | |
580 | packed = packed->next; | |
581 | } | |
ef06b918 | 582 | retval = do_one_ref(base, fn, trim, cb_data, entry); |
e1e22e37 | 583 | if (retval) |
0ae91be0 | 584 | goto end_each; |
e1e22e37 | 585 | } |
8a65ff76 | 586 | |
ef06b918 JH |
587 | for (packed = packed ? packed : loose; packed; packed = packed->next) { |
588 | retval = do_one_ref(base, fn, trim, cb_data, packed); | |
589 | if (retval) | |
0ae91be0 | 590 | goto end_each; |
8a65ff76 | 591 | } |
0ae91be0 SP |
592 | |
593 | end_each: | |
594 | current_ref = NULL; | |
595 | return retval; | |
8a65ff76 LT |
596 | } |
597 | ||
cb5d709f | 598 | int head_ref(each_ref_fn fn, void *cb_data) |
723c31fe LT |
599 | { |
600 | unsigned char sha1[20]; | |
8da19775 JH |
601 | int flag; |
602 | ||
603 | if (resolve_ref("HEAD", sha1, 1, &flag)) | |
604 | return fn("HEAD", sha1, flag, cb_data); | |
2f34ba32 | 605 | return 0; |
723c31fe LT |
606 | } |
607 | ||
cb5d709f | 608 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 609 | { |
cb5d709f | 610 | return do_for_each_ref("refs/", fn, 0, cb_data); |
a62be77f SE |
611 | } |
612 | ||
cb5d709f | 613 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 614 | { |
cb5d709f | 615 | return do_for_each_ref("refs/tags/", fn, 10, cb_data); |
a62be77f SE |
616 | } |
617 | ||
cb5d709f | 618 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 619 | { |
cb5d709f | 620 | return do_for_each_ref("refs/heads/", fn, 11, cb_data); |
a62be77f SE |
621 | } |
622 | ||
cb5d709f | 623 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 624 | { |
cb5d709f | 625 | return do_for_each_ref("refs/remotes/", fn, 13, cb_data); |
8a65ff76 LT |
626 | } |
627 | ||
03feddd6 JH |
628 | /* |
629 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
630 | * We do not like it if: | |
631 | * | |
632 | * - any path component of it begins with ".", or | |
633 | * - it has double dots "..", or | |
634 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
635 | * - it ends with a "/". | |
636 | */ | |
637 | ||
638 | static inline int bad_ref_char(int ch) | |
639 | { | |
8558fd9e DB |
640 | if (((unsigned) ch) <= ' ' || |
641 | ch == '~' || ch == '^' || ch == ':') | |
642 | return 1; | |
643 | /* 2.13 Pattern Matching Notation */ | |
644 | if (ch == '?' || ch == '[') /* Unsupported */ | |
645 | return 1; | |
646 | if (ch == '*') /* Supported at the end */ | |
647 | return 2; | |
648 | return 0; | |
03feddd6 JH |
649 | } |
650 | ||
95fc7512 DB |
651 | int check_ref_format(const char *ref) |
652 | { | |
8558fd9e | 653 | int ch, level, bad_type; |
03feddd6 JH |
654 | const char *cp = ref; |
655 | ||
656 | level = 0; | |
657 | while (1) { | |
658 | while ((ch = *cp++) == '/') | |
659 | ; /* tolerate duplicated slashes */ | |
660 | if (!ch) | |
5f7b202a JH |
661 | /* should not end with slashes */ |
662 | return CHECK_REF_FORMAT_ERROR; | |
03feddd6 JH |
663 | |
664 | /* we are at the beginning of the path component */ | |
8558fd9e | 665 | if (ch == '.') |
5f7b202a | 666 | return CHECK_REF_FORMAT_ERROR; |
8558fd9e DB |
667 | bad_type = bad_ref_char(ch); |
668 | if (bad_type) { | |
5f7b202a JH |
669 | return (bad_type == 2 && !*cp) |
670 | ? CHECK_REF_FORMAT_WILDCARD | |
671 | : CHECK_REF_FORMAT_ERROR; | |
8558fd9e | 672 | } |
03feddd6 JH |
673 | |
674 | /* scan the rest of the path component */ | |
675 | while ((ch = *cp++) != 0) { | |
8558fd9e DB |
676 | bad_type = bad_ref_char(ch); |
677 | if (bad_type) { | |
5f7b202a JH |
678 | return (bad_type == 2 && !*cp) |
679 | ? CHECK_REF_FORMAT_WILDCARD | |
680 | : CHECK_REF_FORMAT_ERROR; | |
8558fd9e | 681 | } |
03feddd6 JH |
682 | if (ch == '/') |
683 | break; | |
684 | if (ch == '.' && *cp == '.') | |
5f7b202a | 685 | return CHECK_REF_FORMAT_ERROR; |
03feddd6 JH |
686 | } |
687 | level++; | |
688 | if (!ch) { | |
689 | if (level < 2) | |
5f7b202a JH |
690 | return CHECK_REF_FORMAT_ONELEVEL; |
691 | return CHECK_REF_FORMAT_OK; | |
03feddd6 JH |
692 | } |
693 | } | |
95fc7512 DB |
694 | } |
695 | ||
79803322 SP |
696 | const char *ref_rev_parse_rules[] = { |
697 | "%.*s", | |
698 | "refs/%.*s", | |
699 | "refs/tags/%.*s", | |
700 | "refs/heads/%.*s", | |
701 | "refs/remotes/%.*s", | |
702 | "refs/remotes/%.*s/HEAD", | |
703 | NULL | |
704 | }; | |
705 | ||
605b4978 SP |
706 | const char *ref_fetch_rules[] = { |
707 | "%.*s", | |
708 | "refs/%.*s", | |
709 | "refs/heads/%.*s", | |
710 | NULL | |
711 | }; | |
712 | ||
79803322 SP |
713 | int refname_match(const char *abbrev_name, const char *full_name, const char **rules) |
714 | { | |
715 | const char **p; | |
716 | const int abbrev_name_len = strlen(abbrev_name); | |
717 | ||
718 | for (p = rules; *p; p++) { | |
719 | if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { | |
720 | return 1; | |
721 | } | |
722 | } | |
723 | ||
724 | return 0; | |
725 | } | |
726 | ||
e5f38ec3 | 727 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
728 | const unsigned char *old_sha1, int mustexist) |
729 | { | |
8da19775 | 730 | if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 731 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
732 | unlock_ref(lock); |
733 | return NULL; | |
734 | } | |
a89fccd2 | 735 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 736 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
737 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
738 | unlock_ref(lock); | |
739 | return NULL; | |
740 | } | |
741 | return lock; | |
742 | } | |
743 | ||
7155b727 | 744 | static int remove_empty_directories(const char *file) |
bc7127ef JH |
745 | { |
746 | /* we want to create a file but there is a directory there; | |
747 | * if that is an empty directory (or a directory that contains | |
748 | * only empty directories), remove them. | |
749 | */ | |
7155b727 JS |
750 | struct strbuf path; |
751 | int result; | |
bc7127ef | 752 | |
7155b727 JS |
753 | strbuf_init(&path, 20); |
754 | strbuf_addstr(&path, file); | |
755 | ||
756 | result = remove_dir_recursively(&path, 1); | |
757 | ||
758 | strbuf_release(&path); | |
759 | ||
760 | return result; | |
bc7127ef JH |
761 | } |
762 | ||
c976d415 LH |
763 | static int is_refname_available(const char *ref, const char *oldref, |
764 | struct ref_list *list, int quiet) | |
765 | { | |
766 | int namlen = strlen(ref); /* e.g. 'foo/bar' */ | |
767 | while (list) { | |
768 | /* list->name could be 'foo' or 'foo/bar/baz' */ | |
769 | if (!oldref || strcmp(oldref, list->name)) { | |
770 | int len = strlen(list->name); | |
771 | int cmplen = (namlen < len) ? namlen : len; | |
772 | const char *lead = (namlen < len) ? list->name : ref; | |
773 | if (!strncmp(ref, list->name, cmplen) && | |
774 | lead[cmplen] == '/') { | |
775 | if (!quiet) | |
776 | error("'%s' exists; cannot create '%s'", | |
777 | list->name, ref); | |
778 | return 0; | |
779 | } | |
780 | } | |
781 | list = list->next; | |
782 | } | |
783 | return 1; | |
784 | } | |
785 | ||
68db31cc | 786 | static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p) |
4bd18c43 | 787 | { |
434cd0cd | 788 | char *ref_file; |
ed378ec7 | 789 | const char *orig_ref = ref; |
4bd18c43 | 790 | struct ref_lock *lock; |
732232a1 | 791 | struct stat st; |
5cc3cef9 | 792 | int last_errno = 0; |
68db31cc | 793 | int type; |
4431fcc4 | 794 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
4bd18c43 SP |
795 | |
796 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
797 | lock->lock_fd = -1; | |
798 | ||
68db31cc | 799 | ref = resolve_ref(ref, lock->old_sha1, mustexist, &type); |
bc7127ef JH |
800 | if (!ref && errno == EISDIR) { |
801 | /* we are trying to lock foo but we used to | |
802 | * have foo/bar which now does not exist; | |
803 | * it is normal for the empty directory 'foo' | |
804 | * to remain. | |
805 | */ | |
806 | ref_file = git_path("%s", orig_ref); | |
5cc3cef9 JH |
807 | if (remove_empty_directories(ref_file)) { |
808 | last_errno = errno; | |
809 | error("there are still refs under '%s'", orig_ref); | |
810 | goto error_return; | |
811 | } | |
68db31cc | 812 | ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type); |
bc7127ef | 813 | } |
68db31cc SV |
814 | if (type_p) |
815 | *type_p = type; | |
ed378ec7 | 816 | if (!ref) { |
5cc3cef9 | 817 | last_errno = errno; |
818f477c | 818 | error("unable to resolve reference %s: %s", |
ed378ec7 | 819 | orig_ref, strerror(errno)); |
5cc3cef9 | 820 | goto error_return; |
4bd18c43 | 821 | } |
c976d415 LH |
822 | /* When the ref did not exist and we are creating it, |
823 | * make sure there is no existing ref that is packed | |
824 | * whose name begins with our refname, nor a ref whose | |
825 | * name is a proper prefix of our refname. | |
826 | */ | |
827 | if (is_null_sha1(lock->old_sha1) && | |
828 | !is_refname_available(ref, NULL, get_packed_refs(), 0)) | |
829 | goto error_return; | |
22a3844e | 830 | |
c33d5174 | 831 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 832 | |
68db31cc SV |
833 | if (flags & REF_NODEREF) |
834 | ref = orig_ref; | |
434cd0cd | 835 | lock->ref_name = xstrdup(ref); |
1655707c | 836 | lock->orig_ref_name = xstrdup(orig_ref); |
7c1a278d | 837 | ref_file = git_path("%s", ref); |
68db31cc SV |
838 | if (lstat(ref_file, &st) && errno == ENOENT) |
839 | lock->force_write = 1; | |
840 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
841 | lock->force_write = 1; | |
4bd18c43 | 842 | |
5cc3cef9 JH |
843 | if (safe_create_leading_directories(ref_file)) { |
844 | last_errno = errno; | |
845 | error("unable to create directory for %s", ref_file); | |
846 | goto error_return; | |
847 | } | |
434cd0cd | 848 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, 1); |
4bd18c43 SP |
849 | |
850 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; | |
5cc3cef9 JH |
851 | |
852 | error_return: | |
853 | unlock_ref(lock); | |
854 | errno = last_errno; | |
855 | return NULL; | |
4bd18c43 SP |
856 | } |
857 | ||
4431fcc4 | 858 | struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1) |
95fc7512 | 859 | { |
53cce84c | 860 | char refpath[PATH_MAX]; |
95fc7512 | 861 | if (check_ref_format(ref)) |
4bd18c43 | 862 | return NULL; |
53cce84c | 863 | strcpy(refpath, mkpath("refs/%s", ref)); |
68db31cc | 864 | return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL); |
4bd18c43 SP |
865 | } |
866 | ||
68db31cc | 867 | struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags) |
4bd18c43 | 868 | { |
5f7b202a | 869 | switch (check_ref_format(ref)) { |
5f7b202a | 870 | default: |
257f3020 JH |
871 | return NULL; |
872 | case 0: | |
873 | case CHECK_REF_FORMAT_ONELEVEL: | |
5f7b202a JH |
874 | return lock_ref_sha1_basic(ref, old_sha1, flags, NULL); |
875 | } | |
c0277d15 JH |
876 | } |
877 | ||
26a063a1 JH |
878 | static struct lock_file packlock; |
879 | ||
c0277d15 JH |
880 | static int repack_without_ref(const char *refname) |
881 | { | |
882 | struct ref_list *list, *packed_ref_list; | |
883 | int fd; | |
884 | int found = 0; | |
c0277d15 JH |
885 | |
886 | packed_ref_list = get_packed_refs(); | |
887 | for (list = packed_ref_list; list; list = list->next) { | |
888 | if (!strcmp(refname, list->name)) { | |
889 | found = 1; | |
890 | break; | |
891 | } | |
892 | } | |
893 | if (!found) | |
894 | return 0; | |
c0277d15 JH |
895 | fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0); |
896 | if (fd < 0) | |
897 | return error("cannot delete '%s' from packed refs", refname); | |
898 | ||
899 | for (list = packed_ref_list; list; list = list->next) { | |
900 | char line[PATH_MAX + 100]; | |
901 | int len; | |
902 | ||
903 | if (!strcmp(refname, list->name)) | |
904 | continue; | |
905 | len = snprintf(line, sizeof(line), "%s %s\n", | |
906 | sha1_to_hex(list->sha1), list->name); | |
907 | /* this should not happen but just being defensive */ | |
908 | if (len > sizeof(line)) | |
909 | die("too long a refname '%s'", list->name); | |
910 | write_or_die(fd, line, len); | |
911 | } | |
912 | return commit_lock_file(&packlock); | |
913 | } | |
914 | ||
1401f46b | 915 | int delete_ref(const char *refname, const unsigned char *sha1) |
c0277d15 JH |
916 | { |
917 | struct ref_lock *lock; | |
918 | int err, i, ret = 0, flag = 0; | |
919 | ||
68db31cc | 920 | lock = lock_ref_sha1_basic(refname, sha1, 0, &flag); |
c0277d15 JH |
921 | if (!lock) |
922 | return 1; | |
923 | if (!(flag & REF_ISPACKED)) { | |
924 | /* loose */ | |
925 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
926 | lock->lk->filename[i] = 0; | |
927 | err = unlink(lock->lk->filename); | |
928 | if (err) { | |
929 | ret = 1; | |
930 | error("unlink(%s) failed: %s", | |
931 | lock->lk->filename, strerror(errno)); | |
932 | } | |
933 | lock->lk->filename[i] = '.'; | |
934 | } | |
935 | /* removing the loose one could have resurrected an earlier | |
936 | * packed one. Also, if it was not loose we need to repack | |
937 | * without it. | |
938 | */ | |
939 | ret |= repack_without_ref(refname); | |
940 | ||
9a13f0b7 | 941 | err = unlink(git_path("logs/%s", lock->ref_name)); |
c0277d15 JH |
942 | if (err && errno != ENOENT) |
943 | fprintf(stderr, "warning: unlink(%s) failed: %s", | |
9a13f0b7 | 944 | git_path("logs/%s", lock->ref_name), strerror(errno)); |
c0277d15 JH |
945 | invalidate_cached_refs(); |
946 | unlock_ref(lock); | |
947 | return ret; | |
4bd18c43 SP |
948 | } |
949 | ||
678d0f4c | 950 | int rename_ref(const char *oldref, const char *newref, const char *logmsg) |
c976d415 LH |
951 | { |
952 | static const char renamed_ref[] = "RENAMED-REF"; | |
953 | unsigned char sha1[20], orig_sha1[20]; | |
954 | int flag = 0, logmoved = 0; | |
955 | struct ref_lock *lock; | |
c976d415 | 956 | struct stat loginfo; |
16c2bfbb | 957 | int log = !lstat(git_path("logs/%s", oldref), &loginfo); |
c976d415 LH |
958 | |
959 | if (S_ISLNK(loginfo.st_mode)) | |
960 | return error("reflog for %s is a symlink", oldref); | |
961 | ||
962 | if (!resolve_ref(oldref, orig_sha1, 1, &flag)) | |
963 | return error("refname %s not found", oldref); | |
964 | ||
965 | if (!is_refname_available(newref, oldref, get_packed_refs(), 0)) | |
966 | return 1; | |
967 | ||
968 | if (!is_refname_available(newref, oldref, get_loose_refs(), 0)) | |
969 | return 1; | |
970 | ||
68db31cc | 971 | lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL); |
c976d415 LH |
972 | if (!lock) |
973 | return error("unable to lock %s", renamed_ref); | |
974 | lock->force_write = 1; | |
678d0f4c | 975 | if (write_ref_sha1(lock, orig_sha1, logmsg)) |
c976d415 LH |
976 | return error("unable to save current sha1 in %s", renamed_ref); |
977 | ||
978 | if (log && rename(git_path("logs/%s", oldref), git_path("tmp-renamed-log"))) | |
979 | return error("unable to move logfile logs/%s to tmp-renamed-log: %s", | |
980 | oldref, strerror(errno)); | |
981 | ||
982 | if (delete_ref(oldref, orig_sha1)) { | |
983 | error("unable to delete old %s", oldref); | |
984 | goto rollback; | |
985 | } | |
986 | ||
987 | if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1)) { | |
988 | if (errno==EISDIR) { | |
989 | if (remove_empty_directories(git_path("%s", newref))) { | |
990 | error("Directory not empty: %s", newref); | |
991 | goto rollback; | |
992 | } | |
993 | } else { | |
994 | error("unable to delete existing %s", newref); | |
995 | goto rollback; | |
996 | } | |
997 | } | |
998 | ||
999 | if (log && safe_create_leading_directories(git_path("logs/%s", newref))) { | |
1000 | error("unable to create directory for %s", newref); | |
1001 | goto rollback; | |
1002 | } | |
1003 | ||
1004 | retry: | |
1005 | if (log && rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref))) { | |
d9e74d57 JR |
1006 | if (errno==EISDIR || errno==ENOTDIR) { |
1007 | /* | |
1008 | * rename(a, b) when b is an existing | |
1009 | * directory ought to result in ISDIR, but | |
1010 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
1011 | */ | |
c976d415 LH |
1012 | if (remove_empty_directories(git_path("logs/%s", newref))) { |
1013 | error("Directory not empty: logs/%s", newref); | |
1014 | goto rollback; | |
1015 | } | |
1016 | goto retry; | |
1017 | } else { | |
1018 | error("unable to move logfile tmp-renamed-log to logs/%s: %s", | |
1019 | newref, strerror(errno)); | |
1020 | goto rollback; | |
1021 | } | |
1022 | } | |
1023 | logmoved = log; | |
1024 | ||
68db31cc | 1025 | lock = lock_ref_sha1_basic(newref, NULL, 0, NULL); |
c976d415 LH |
1026 | if (!lock) { |
1027 | error("unable to lock %s for update", newref); | |
1028 | goto rollback; | |
1029 | } | |
1030 | ||
1031 | lock->force_write = 1; | |
1032 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 1033 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
c976d415 LH |
1034 | error("unable to write current sha1 into %s", newref); |
1035 | goto rollback; | |
1036 | } | |
1037 | ||
1038 | return 0; | |
1039 | ||
1040 | rollback: | |
68db31cc | 1041 | lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL); |
c976d415 LH |
1042 | if (!lock) { |
1043 | error("unable to lock %s for rollback", oldref); | |
1044 | goto rollbacklog; | |
1045 | } | |
1046 | ||
1047 | lock->force_write = 1; | |
1048 | flag = log_all_ref_updates; | |
1049 | log_all_ref_updates = 0; | |
1050 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
1051 | error("unable to write current sha1 into %s", oldref); | |
1052 | log_all_ref_updates = flag; | |
1053 | ||
1054 | rollbacklog: | |
1055 | if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref))) | |
1056 | error("unable to restore logfile %s from %s: %s", | |
1057 | oldref, newref, strerror(errno)); | |
1058 | if (!logmoved && log && | |
1059 | rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref))) | |
1060 | error("unable to restore logfile %s from tmp-renamed-log: %s", | |
1061 | oldref, strerror(errno)); | |
1062 | ||
1063 | return 1; | |
1064 | } | |
1065 | ||
435fc852 | 1066 | int close_ref(struct ref_lock *lock) |
b531394d BC |
1067 | { |
1068 | if (close_lock_file(lock->lk)) | |
1069 | return -1; | |
1070 | lock->lock_fd = -1; | |
1071 | return 0; | |
1072 | } | |
1073 | ||
435fc852 | 1074 | int commit_ref(struct ref_lock *lock) |
b531394d BC |
1075 | { |
1076 | if (commit_lock_file(lock->lk)) | |
1077 | return -1; | |
1078 | lock->lock_fd = -1; | |
1079 | return 0; | |
1080 | } | |
1081 | ||
e5f38ec3 | 1082 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 | 1083 | { |
4ed7cd3a BC |
1084 | /* Do not free lock->lk -- atexit() still looks at them */ |
1085 | if (lock->lk) | |
1086 | rollback_lock_file(lock->lk); | |
434cd0cd | 1087 | free(lock->ref_name); |
1655707c | 1088 | free(lock->orig_ref_name); |
4bd18c43 SP |
1089 | free(lock); |
1090 | } | |
1091 | ||
0ec29a47 JH |
1092 | /* |
1093 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
1094 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
1095 | * because reflog file is one line per entry. | |
1096 | */ | |
1097 | static int copy_msg(char *buf, const char *msg) | |
1098 | { | |
1099 | char *cp = buf; | |
1100 | char c; | |
1101 | int wasspace = 1; | |
1102 | ||
1103 | *cp++ = '\t'; | |
1104 | while ((c = *msg++)) { | |
1105 | if (wasspace && isspace(c)) | |
1106 | continue; | |
1107 | wasspace = isspace(c); | |
1108 | if (wasspace) | |
1109 | c = ' '; | |
1110 | *cp++ = c; | |
1111 | } | |
1112 | while (buf < cp && isspace(cp[-1])) | |
1113 | cp--; | |
1114 | *cp++ = '\n'; | |
1115 | return cp - buf; | |
1116 | } | |
1117 | ||
9a13f0b7 NP |
1118 | static int log_ref_write(const char *ref_name, const unsigned char *old_sha1, |
1119 | const unsigned char *new_sha1, const char *msg) | |
6de08ae6 SP |
1120 | { |
1121 | int logfd, written, oflags = O_APPEND | O_WRONLY; | |
1122 | unsigned maxlen, len; | |
8ac65937 | 1123 | int msglen; |
9a13f0b7 | 1124 | char *log_file, *logrec; |
ff4c8485 | 1125 | const char *committer; |
6de08ae6 | 1126 | |
510c5a8e | 1127 | if (log_all_ref_updates < 0) |
7d1864ce | 1128 | log_all_ref_updates = !is_bare_repository(); |
510c5a8e | 1129 | |
9a13f0b7 NP |
1130 | log_file = git_path("logs/%s", ref_name); |
1131 | ||
4057deb5 | 1132 | if (log_all_ref_updates && |
cc44c765 JH |
1133 | (!prefixcmp(ref_name, "refs/heads/") || |
1134 | !prefixcmp(ref_name, "refs/remotes/") || | |
bd104db1 | 1135 | !strcmp(ref_name, "HEAD"))) { |
9a13f0b7 | 1136 | if (safe_create_leading_directories(log_file) < 0) |
6de08ae6 | 1137 | return error("unable to create directory for %s", |
9a13f0b7 | 1138 | log_file); |
6de08ae6 SP |
1139 | oflags |= O_CREAT; |
1140 | } | |
1141 | ||
9a13f0b7 | 1142 | logfd = open(log_file, oflags, 0666); |
6de08ae6 | 1143 | if (logfd < 0) { |
1974bf62 | 1144 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 1145 | return 0; |
3b463c3f JH |
1146 | |
1147 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
9a13f0b7 | 1148 | if (remove_empty_directories(log_file)) { |
3b463c3f | 1149 | return error("There are still logs under '%s'", |
9a13f0b7 | 1150 | log_file); |
3b463c3f | 1151 | } |
9a13f0b7 | 1152 | logfd = open(log_file, oflags, 0666); |
3b463c3f JH |
1153 | } |
1154 | ||
1155 | if (logfd < 0) | |
1156 | return error("Unable to append to %s: %s", | |
9a13f0b7 | 1157 | log_file, strerror(errno)); |
6de08ae6 SP |
1158 | } |
1159 | ||
443b92b6 MK |
1160 | adjust_shared_perm(log_file); |
1161 | ||
0ec29a47 | 1162 | msglen = msg ? strlen(msg) : 0; |
774751a8 | 1163 | committer = git_committer_info(0); |
8ac65937 JH |
1164 | maxlen = strlen(committer) + msglen + 100; |
1165 | logrec = xmalloc(maxlen); | |
1166 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
1167 | sha1_to_hex(old_sha1), |
1168 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
1169 | committer); |
1170 | if (msglen) | |
0ec29a47 | 1171 | len += copy_msg(logrec + len - 1, msg) - 1; |
93822c22 | 1172 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 | 1173 | free(logrec); |
91c8d590 | 1174 | if (close(logfd) != 0 || written != len) |
9a13f0b7 | 1175 | return error("Unable to append to %s", log_file); |
6de08ae6 SP |
1176 | return 0; |
1177 | } | |
1178 | ||
c3b0dec5 LT |
1179 | static int is_branch(const char *refname) |
1180 | { | |
1181 | return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/"); | |
1182 | } | |
1183 | ||
4bd18c43 SP |
1184 | int write_ref_sha1(struct ref_lock *lock, |
1185 | const unsigned char *sha1, const char *logmsg) | |
1186 | { | |
1187 | static char term = '\n'; | |
c3b0dec5 | 1188 | struct object *o; |
4bd18c43 SP |
1189 | |
1190 | if (!lock) | |
95fc7512 | 1191 | return -1; |
a89fccd2 | 1192 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
1193 | unlock_ref(lock); |
1194 | return 0; | |
95fc7512 | 1195 | } |
c3b0dec5 LT |
1196 | o = parse_object(sha1); |
1197 | if (!o) { | |
1198 | error("Trying to write ref %s with nonexistant object %s", | |
1199 | lock->ref_name, sha1_to_hex(sha1)); | |
1200 | unlock_ref(lock); | |
1201 | return -1; | |
1202 | } | |
1203 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1204 | error("Trying to write non-commit object %s to branch %s", | |
1205 | sha1_to_hex(sha1), lock->ref_name); | |
1206 | unlock_ref(lock); | |
1207 | return -1; | |
1208 | } | |
93822c22 AW |
1209 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
1210 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
b531394d | 1211 | || close_ref(lock) < 0) { |
c33d5174 | 1212 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
1213 | unlock_ref(lock); |
1214 | return -1; | |
1215 | } | |
5e290ff7 | 1216 | invalidate_cached_refs(); |
bd104db1 NP |
1217 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
1218 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
1219 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
1220 | unlock_ref(lock); |
1221 | return -1; | |
1222 | } | |
605fac8b NP |
1223 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
1224 | /* | |
1225 | * Special hack: If a branch is updated directly and HEAD | |
1226 | * points to it (may happen on the remote side of a push | |
1227 | * for example) then logically the HEAD reflog should be | |
1228 | * updated too. | |
1229 | * A generic solution implies reverse symref information, | |
1230 | * but finding all symrefs pointing to the given branch | |
1231 | * would be rather costly for this rare event (the direct | |
1232 | * update of a branch) to be worth it. So let's cheat and | |
1233 | * check with HEAD only which should cover 99% of all usage | |
1234 | * scenarios (even 100% of the default ones). | |
1235 | */ | |
1236 | unsigned char head_sha1[20]; | |
1237 | int head_flag; | |
1238 | const char *head_ref; | |
1239 | head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag); | |
1240 | if (head_ref && (head_flag & REF_ISSYMREF) && | |
1241 | !strcmp(head_ref, lock->ref_name)) | |
1242 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
1243 | } | |
b531394d | 1244 | if (commit_ref(lock)) { |
434cd0cd | 1245 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
1246 | unlock_ref(lock); |
1247 | return -1; | |
1248 | } | |
4bd18c43 SP |
1249 | unlock_ref(lock); |
1250 | return 0; | |
95fc7512 | 1251 | } |
d556fae2 | 1252 | |
8b5157e4 NP |
1253 | int create_symref(const char *ref_target, const char *refs_heads_master, |
1254 | const char *logmsg) | |
41b625b0 NP |
1255 | { |
1256 | const char *lockpath; | |
1257 | char ref[1000]; | |
1258 | int fd, len, written; | |
47fc52e2 | 1259 | char *git_HEAD = xstrdup(git_path("%s", ref_target)); |
8b5157e4 NP |
1260 | unsigned char old_sha1[20], new_sha1[20]; |
1261 | ||
1262 | if (logmsg && read_ref(ref_target, old_sha1)) | |
1263 | hashclr(old_sha1); | |
41b625b0 | 1264 | |
d48744d1 JH |
1265 | if (safe_create_leading_directories(git_HEAD) < 0) |
1266 | return error("unable to create directory for %s", git_HEAD); | |
1267 | ||
41b625b0 NP |
1268 | #ifndef NO_SYMLINK_HEAD |
1269 | if (prefer_symlink_refs) { | |
1270 | unlink(git_HEAD); | |
1271 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 1272 | goto done; |
41b625b0 NP |
1273 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
1274 | } | |
1275 | #endif | |
1276 | ||
1277 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
1278 | if (sizeof(ref) <= len) { | |
1279 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 1280 | goto error_free_return; |
41b625b0 NP |
1281 | } |
1282 | lockpath = mkpath("%s.lock", git_HEAD); | |
1283 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
1284 | if (fd < 0) { | |
1285 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 1286 | goto error_free_return; |
41b625b0 NP |
1287 | } |
1288 | written = write_in_full(fd, ref, len); | |
91c8d590 | 1289 | if (close(fd) != 0 || written != len) { |
41b625b0 | 1290 | error("Unable to write to %s", lockpath); |
47fc52e2 | 1291 | goto error_unlink_return; |
41b625b0 NP |
1292 | } |
1293 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 1294 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 1295 | goto error_unlink_return; |
41b625b0 NP |
1296 | } |
1297 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 1298 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 JH |
1299 | error_unlink_return: |
1300 | unlink(lockpath); | |
1301 | error_free_return: | |
1302 | free(git_HEAD); | |
1303 | return -1; | |
41b625b0 | 1304 | } |
8b5157e4 | 1305 | |
ee96d11b | 1306 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 1307 | done: |
ee96d11b | 1308 | #endif |
8b5157e4 NP |
1309 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
1310 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
1311 | ||
47fc52e2 | 1312 | free(git_HEAD); |
41b625b0 NP |
1313 | return 0; |
1314 | } | |
1315 | ||
16d7cc90 JH |
1316 | static char *ref_msg(const char *line, const char *endp) |
1317 | { | |
1318 | const char *ep; | |
16d7cc90 | 1319 | line += 82; |
182af834 PH |
1320 | ep = memchr(line, '\n', endp - line); |
1321 | if (!ep) | |
1322 | ep = endp; | |
1323 | return xmemdupz(line, ep - line); | |
16d7cc90 JH |
1324 | } |
1325 | ||
1326 | 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 | 1327 | { |
e5229042 | 1328 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 | 1329 | char *tz_c; |
e29cb53a | 1330 | int logfd, tz, reccnt = 0; |
d556fae2 SP |
1331 | struct stat st; |
1332 | unsigned long date; | |
e5229042 | 1333 | unsigned char logged_sha1[20]; |
cb48cb58 | 1334 | void *log_mapped; |
dc49cd76 | 1335 | size_t mapsz; |
d556fae2 SP |
1336 | |
1337 | logfile = git_path("logs/%s", ref); | |
1338 | logfd = open(logfile, O_RDONLY, 0); | |
1339 | if (logfd < 0) | |
1340 | die("Unable to read log %s: %s", logfile, strerror(errno)); | |
1341 | fstat(logfd, &st); | |
1342 | if (!st.st_size) | |
1343 | die("Log %s is empty.", logfile); | |
dc49cd76 SP |
1344 | mapsz = xsize_t(st.st_size); |
1345 | log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0); | |
cb48cb58 | 1346 | logdata = log_mapped; |
d556fae2 SP |
1347 | close(logfd); |
1348 | ||
e5229042 | 1349 | lastrec = NULL; |
d556fae2 SP |
1350 | rec = logend = logdata + st.st_size; |
1351 | while (logdata < rec) { | |
e29cb53a | 1352 | reccnt++; |
d556fae2 SP |
1353 | if (logdata < rec && *(rec-1) == '\n') |
1354 | rec--; | |
e5229042 SP |
1355 | lastgt = NULL; |
1356 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 1357 | rec--; |
e5229042 SP |
1358 | if (*rec == '>') |
1359 | lastgt = rec; | |
1360 | } | |
1361 | if (!lastgt) | |
d556fae2 | 1362 | die("Log %s is corrupt.", logfile); |
e5229042 | 1363 | date = strtoul(lastgt + 1, &tz_c, 10); |
ab2a1a32 | 1364 | if (date <= at_time || cnt == 0) { |
76a44c5c | 1365 | tz = strtoul(tz_c, NULL, 10); |
16d7cc90 JH |
1366 | if (msg) |
1367 | *msg = ref_msg(rec, logend); | |
1368 | if (cutoff_time) | |
1369 | *cutoff_time = date; | |
1370 | if (cutoff_tz) | |
1371 | *cutoff_tz = tz; | |
1372 | if (cutoff_cnt) | |
76a44c5c | 1373 | *cutoff_cnt = reccnt - 1; |
e5229042 SP |
1374 | if (lastrec) { |
1375 | if (get_sha1_hex(lastrec, logged_sha1)) | |
1376 | die("Log %s is corrupt.", logfile); | |
1377 | if (get_sha1_hex(rec + 41, sha1)) | |
1378 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1379 | if (hashcmp(logged_sha1, sha1)) { |
e5229042 SP |
1380 | fprintf(stderr, |
1381 | "warning: Log %s has gap after %s.\n", | |
73013afd | 1382 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 | 1383 | } |
e5f38ec3 JH |
1384 | } |
1385 | else if (date == at_time) { | |
e5229042 SP |
1386 | if (get_sha1_hex(rec + 41, sha1)) |
1387 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
1388 | } |
1389 | else { | |
e5229042 SP |
1390 | if (get_sha1_hex(rec + 41, logged_sha1)) |
1391 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1392 | if (hashcmp(logged_sha1, sha1)) { |
e5229042 SP |
1393 | fprintf(stderr, |
1394 | "warning: Log %s unexpectedly ended on %s.\n", | |
73013afd | 1395 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 SP |
1396 | } |
1397 | } | |
dc49cd76 | 1398 | munmap(log_mapped, mapsz); |
d556fae2 SP |
1399 | return 0; |
1400 | } | |
e5229042 | 1401 | lastrec = rec; |
ab2a1a32 JH |
1402 | if (cnt > 0) |
1403 | cnt--; | |
d556fae2 SP |
1404 | } |
1405 | ||
e5229042 SP |
1406 | rec = logdata; |
1407 | while (rec < logend && *rec != '>' && *rec != '\n') | |
1408 | rec++; | |
1409 | if (rec == logend || *rec == '\n') | |
d556fae2 | 1410 | die("Log %s is corrupt.", logfile); |
e5229042 | 1411 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
1412 | tz = strtoul(tz_c, NULL, 10); |
1413 | if (get_sha1_hex(logdata, sha1)) | |
1414 | die("Log %s is corrupt.", logfile); | |
16d7cc90 JH |
1415 | if (msg) |
1416 | *msg = ref_msg(logdata, logend); | |
dc49cd76 | 1417 | munmap(log_mapped, mapsz); |
16d7cc90 JH |
1418 | |
1419 | if (cutoff_time) | |
1420 | *cutoff_time = date; | |
1421 | if (cutoff_tz) | |
1422 | *cutoff_tz = tz; | |
1423 | if (cutoff_cnt) | |
1424 | *cutoff_cnt = reccnt; | |
1425 | return 1; | |
d556fae2 | 1426 | } |
2ff81662 | 1427 | |
883d60fa | 1428 | int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data) |
2ff81662 JH |
1429 | { |
1430 | const char *logfile; | |
1431 | FILE *logfp; | |
1432 | char buf[1024]; | |
2266bf27 | 1433 | int ret = 0; |
2ff81662 JH |
1434 | |
1435 | logfile = git_path("logs/%s", ref); | |
1436 | logfp = fopen(logfile, "r"); | |
1437 | if (!logfp) | |
883d60fa | 1438 | return -1; |
2ff81662 JH |
1439 | while (fgets(buf, sizeof(buf), logfp)) { |
1440 | unsigned char osha1[20], nsha1[20]; | |
883d60fa JS |
1441 | char *email_end, *message; |
1442 | unsigned long timestamp; | |
2266bf27 | 1443 | int len, tz; |
2ff81662 JH |
1444 | |
1445 | /* old SP new SP name <email> SP time TAB msg LF */ | |
1446 | len = strlen(buf); | |
1447 | if (len < 83 || buf[len-1] != '\n' || | |
1448 | get_sha1_hex(buf, osha1) || buf[40] != ' ' || | |
883d60fa JS |
1449 | get_sha1_hex(buf + 41, nsha1) || buf[81] != ' ' || |
1450 | !(email_end = strchr(buf + 82, '>')) || | |
1451 | email_end[1] != ' ' || | |
1452 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
1453 | !message || message[0] != ' ' || | |
1454 | (message[1] != '+' && message[1] != '-') || | |
1455 | !isdigit(message[2]) || !isdigit(message[3]) || | |
b4dd4856 | 1456 | !isdigit(message[4]) || !isdigit(message[5])) |
2ff81662 | 1457 | continue; /* corrupt? */ |
883d60fa JS |
1458 | email_end[1] = '\0'; |
1459 | tz = strtol(message + 1, NULL, 10); | |
b4dd4856 JS |
1460 | if (message[6] != '\t') |
1461 | message += 6; | |
1462 | else | |
1463 | message += 7; | |
883d60fa JS |
1464 | ret = fn(osha1, nsha1, buf+82, timestamp, tz, message, cb_data); |
1465 | if (ret) | |
2266bf27 | 1466 | break; |
2ff81662 JH |
1467 | } |
1468 | fclose(logfp); | |
2266bf27 | 1469 | return ret; |
2ff81662 | 1470 | } |
e29cb53a | 1471 | |
eb8381c8 NP |
1472 | static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data) |
1473 | { | |
1474 | DIR *dir = opendir(git_path("logs/%s", base)); | |
fcee5a14 | 1475 | int retval = 0; |
eb8381c8 NP |
1476 | |
1477 | if (dir) { | |
1478 | struct dirent *de; | |
1479 | int baselen = strlen(base); | |
1480 | char *log = xmalloc(baselen + 257); | |
1481 | ||
1482 | memcpy(log, base, baselen); | |
1483 | if (baselen && base[baselen-1] != '/') | |
1484 | log[baselen++] = '/'; | |
1485 | ||
1486 | while ((de = readdir(dir)) != NULL) { | |
1487 | struct stat st; | |
1488 | int namelen; | |
1489 | ||
1490 | if (de->d_name[0] == '.') | |
1491 | continue; | |
1492 | namelen = strlen(de->d_name); | |
1493 | if (namelen > 255) | |
1494 | continue; | |
1495 | if (has_extension(de->d_name, ".lock")) | |
1496 | continue; | |
1497 | memcpy(log + baselen, de->d_name, namelen+1); | |
1498 | if (stat(git_path("logs/%s", log), &st) < 0) | |
1499 | continue; | |
1500 | if (S_ISDIR(st.st_mode)) { | |
1501 | retval = do_for_each_reflog(log, fn, cb_data); | |
1502 | } else { | |
1503 | unsigned char sha1[20]; | |
1504 | if (!resolve_ref(log, sha1, 0, NULL)) | |
1505 | retval = error("bad ref for %s", log); | |
1506 | else | |
1507 | retval = fn(log, sha1, 0, cb_data); | |
1508 | } | |
1509 | if (retval) | |
1510 | break; | |
1511 | } | |
1512 | free(log); | |
1513 | closedir(dir); | |
1514 | } | |
acb39f64 | 1515 | else if (*base) |
fcee5a14 | 1516 | return errno; |
eb8381c8 NP |
1517 | return retval; |
1518 | } | |
1519 | ||
1520 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
1521 | { | |
1522 | return do_for_each_reflog("", fn, cb_data); | |
1523 | } | |
3d9f037c CR |
1524 | |
1525 | int update_ref(const char *action, const char *refname, | |
1526 | const unsigned char *sha1, const unsigned char *oldval, | |
1527 | int flags, enum action_on_err onerr) | |
1528 | { | |
1529 | static struct ref_lock *lock; | |
1530 | lock = lock_any_ref_for_update(refname, oldval, flags); | |
1531 | if (!lock) { | |
1532 | const char *str = "Cannot lock the ref '%s'."; | |
1533 | switch (onerr) { | |
1534 | case MSG_ON_ERR: error(str, refname); break; | |
1535 | case DIE_ON_ERR: die(str, refname); break; | |
1536 | case QUIET_ON_ERR: break; | |
1537 | } | |
1538 | return 1; | |
1539 | } | |
1540 | if (write_ref_sha1(lock, sha1, action) < 0) { | |
1541 | const char *str = "Cannot update the ref '%s'."; | |
1542 | switch (onerr) { | |
1543 | case MSG_ON_ERR: error(str, refname); break; | |
1544 | case DIE_ON_ERR: die(str, refname); break; | |
1545 | case QUIET_ON_ERR: break; | |
1546 | } | |
1547 | return 1; | |
1548 | } | |
1549 | return 0; | |
1550 | } | |
cda69f48 JK |
1551 | |
1552 | struct ref *find_ref_by_name(struct ref *list, const char *name) | |
1553 | { | |
1554 | for ( ; list; list = list->next) | |
1555 | if (!strcmp(list->name, name)) | |
1556 | return list; | |
1557 | return NULL; | |
1558 | } |