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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" | |
95fc7512 | 5 | |
f4204ab9 JH |
6 | /* ISSYMREF=01 and ISPACKED=02 are public interfaces */ |
7 | #define REF_KNOWS_PEELED 04 | |
8 | ||
e1e22e37 LT |
9 | struct ref_list { |
10 | struct ref_list *next; | |
f4204ab9 | 11 | unsigned char flag; /* ISSYMREF? ISPACKED? */ |
e1e22e37 | 12 | unsigned char sha1[20]; |
f4204ab9 | 13 | unsigned char peeled[20]; |
e1e22e37 LT |
14 | char name[FLEX_ARRAY]; |
15 | }; | |
16 | ||
f4204ab9 | 17 | static const char *parse_ref_line(char *line, unsigned char *sha1) |
e1e22e37 LT |
18 | { |
19 | /* | |
20 | * 42: the answer to everything. | |
21 | * | |
22 | * In this case, it happens to be the answer to | |
23 | * 40 (length of sha1 hex representation) | |
24 | * +1 (space in between hex and name) | |
25 | * +1 (newline at the end of the line) | |
26 | */ | |
27 | int len = strlen(line) - 42; | |
28 | ||
29 | if (len <= 0) | |
30 | return NULL; | |
31 | if (get_sha1_hex(line, sha1) < 0) | |
32 | return NULL; | |
33 | if (!isspace(line[40])) | |
34 | return NULL; | |
35 | line += 41; | |
f4204ab9 JH |
36 | if (isspace(*line)) |
37 | return NULL; | |
e1e22e37 LT |
38 | if (line[len] != '\n') |
39 | return NULL; | |
40 | line[len] = 0; | |
cf0adba7 | 41 | |
e1e22e37 LT |
42 | return line; |
43 | } | |
44 | ||
8da19775 | 45 | static struct ref_list *add_ref(const char *name, const unsigned char *sha1, |
f4204ab9 JH |
46 | int flag, struct ref_list *list, |
47 | struct ref_list **new_entry) | |
e1e22e37 LT |
48 | { |
49 | int len; | |
c774aab9 | 50 | struct ref_list *entry; |
e1e22e37 LT |
51 | |
52 | /* Allocate it and add it in.. */ | |
53 | len = strlen(name) + 1; | |
54 | entry = xmalloc(sizeof(struct ref_list) + len); | |
55 | hashcpy(entry->sha1, sha1); | |
f4204ab9 | 56 | hashclr(entry->peeled); |
e1e22e37 | 57 | memcpy(entry->name, name, len); |
8da19775 | 58 | entry->flag = flag; |
c774aab9 | 59 | entry->next = list; |
f4204ab9 JH |
60 | if (new_entry) |
61 | *new_entry = entry; | |
c774aab9 JP |
62 | return entry; |
63 | } | |
64 | ||
65 | /* merge sort the ref list */ | |
66 | static struct ref_list *sort_ref_list(struct ref_list *list) | |
67 | { | |
68 | int psize, qsize, last_merge_count, cmp; | |
69 | struct ref_list *p, *q, *l, *e; | |
70 | struct ref_list *new_list = list; | |
71 | int k = 1; | |
72 | int merge_count = 0; | |
73 | ||
74 | if (!list) | |
75 | return list; | |
76 | ||
77 | do { | |
78 | last_merge_count = merge_count; | |
79 | merge_count = 0; | |
80 | ||
81 | psize = 0; | |
82 | ||
83 | p = new_list; | |
84 | q = new_list; | |
85 | new_list = NULL; | |
86 | l = NULL; | |
87 | ||
88 | while (p) { | |
89 | merge_count++; | |
90 | ||
91 | while (psize < k && q->next) { | |
92 | q = q->next; | |
93 | psize++; | |
94 | } | |
95 | qsize = k; | |
96 | ||
97 | while ((psize > 0) || (qsize > 0 && q)) { | |
98 | if (qsize == 0 || !q) { | |
99 | e = p; | |
100 | p = p->next; | |
101 | psize--; | |
102 | } else if (psize == 0) { | |
103 | e = q; | |
104 | q = q->next; | |
105 | qsize--; | |
106 | } else { | |
107 | cmp = strcmp(q->name, p->name); | |
108 | if (cmp < 0) { | |
109 | e = q; | |
110 | q = q->next; | |
111 | qsize--; | |
112 | } else if (cmp > 0) { | |
113 | e = p; | |
114 | p = p->next; | |
115 | psize--; | |
116 | } else { | |
117 | if (hashcmp(q->sha1, p->sha1)) | |
118 | die("Duplicated ref, and SHA1s don't match: %s", | |
119 | q->name); | |
120 | warning("Duplicated ref: %s", q->name); | |
121 | e = q; | |
122 | q = q->next; | |
123 | qsize--; | |
124 | free(e); | |
125 | e = p; | |
126 | p = p->next; | |
127 | psize--; | |
128 | } | |
129 | } | |
130 | ||
131 | e->next = NULL; | |
132 | ||
133 | if (l) | |
134 | l->next = e; | |
135 | if (!new_list) | |
136 | new_list = e; | |
137 | l = e; | |
138 | } | |
139 | ||
140 | p = q; | |
141 | }; | |
142 | ||
143 | k = k * 2; | |
144 | } while ((last_merge_count != merge_count) || (last_merge_count != 1)); | |
145 | ||
146 | return new_list; | |
e1e22e37 LT |
147 | } |
148 | ||
5e290ff7 JH |
149 | /* |
150 | * Future: need to be in "struct repository" | |
151 | * when doing a full libification. | |
152 | */ | |
153 | struct cached_refs { | |
154 | char did_loose; | |
155 | char did_packed; | |
156 | struct ref_list *loose; | |
157 | struct ref_list *packed; | |
158 | } cached_refs; | |
159 | ||
160 | static void free_ref_list(struct ref_list *list) | |
161 | { | |
162 | struct ref_list *next; | |
163 | for ( ; list; list = next) { | |
164 | next = list->next; | |
165 | free(list); | |
166 | } | |
167 | } | |
168 | ||
169 | static void invalidate_cached_refs(void) | |
e1e22e37 | 170 | { |
5e290ff7 JH |
171 | struct cached_refs *ca = &cached_refs; |
172 | ||
173 | if (ca->did_loose && ca->loose) | |
174 | free_ref_list(ca->loose); | |
175 | if (ca->did_packed && ca->packed) | |
176 | free_ref_list(ca->packed); | |
177 | ca->loose = ca->packed = NULL; | |
178 | ca->did_loose = ca->did_packed = 0; | |
179 | } | |
e1e22e37 | 180 | |
f4204ab9 JH |
181 | static void read_packed_refs(FILE *f, struct cached_refs *cached_refs) |
182 | { | |
183 | struct ref_list *list = NULL; | |
184 | struct ref_list *last = NULL; | |
185 | char refline[PATH_MAX]; | |
186 | int flag = REF_ISPACKED; | |
187 | ||
188 | while (fgets(refline, sizeof(refline), f)) { | |
189 | unsigned char sha1[20]; | |
190 | const char *name; | |
191 | static const char header[] = "# pack-refs with:"; | |
192 | ||
193 | if (!strncmp(refline, header, sizeof(header)-1)) { | |
194 | const char *traits = refline + sizeof(header) - 1; | |
195 | if (strstr(traits, " peeled ")) | |
196 | flag |= REF_KNOWS_PEELED; | |
197 | /* perhaps other traits later as well */ | |
198 | continue; | |
199 | } | |
200 | ||
201 | name = parse_ref_line(refline, sha1); | |
202 | if (name) { | |
203 | list = add_ref(name, sha1, flag, list, &last); | |
204 | continue; | |
205 | } | |
206 | if (last && | |
207 | refline[0] == '^' && | |
208 | strlen(refline) == 42 && | |
209 | refline[41] == '\n' && | |
210 | !get_sha1_hex(refline + 1, sha1)) | |
211 | hashcpy(last->peeled, sha1); | |
212 | } | |
c774aab9 | 213 | cached_refs->packed = sort_ref_list(list); |
f4204ab9 JH |
214 | } |
215 | ||
5e290ff7 JH |
216 | static struct ref_list *get_packed_refs(void) |
217 | { | |
218 | if (!cached_refs.did_packed) { | |
e1e22e37 | 219 | FILE *f = fopen(git_path("packed-refs"), "r"); |
f4204ab9 | 220 | cached_refs.packed = NULL; |
e1e22e37 | 221 | if (f) { |
f4204ab9 | 222 | read_packed_refs(f, &cached_refs); |
e1e22e37 | 223 | fclose(f); |
e1e22e37 | 224 | } |
5e290ff7 | 225 | cached_refs.did_packed = 1; |
e1e22e37 | 226 | } |
5e290ff7 | 227 | return cached_refs.packed; |
e1e22e37 LT |
228 | } |
229 | ||
230 | static struct ref_list *get_ref_dir(const char *base, struct ref_list *list) | |
231 | { | |
232 | DIR *dir = opendir(git_path("%s", base)); | |
233 | ||
234 | if (dir) { | |
235 | struct dirent *de; | |
236 | int baselen = strlen(base); | |
ed378ec7 | 237 | char *ref = xmalloc(baselen + 257); |
e1e22e37 | 238 | |
ed378ec7 | 239 | memcpy(ref, base, baselen); |
e1e22e37 | 240 | if (baselen && base[baselen-1] != '/') |
ed378ec7 | 241 | ref[baselen++] = '/'; |
e1e22e37 LT |
242 | |
243 | while ((de = readdir(dir)) != NULL) { | |
244 | unsigned char sha1[20]; | |
245 | struct stat st; | |
8da19775 | 246 | int flag; |
e1e22e37 LT |
247 | int namelen; |
248 | ||
249 | if (de->d_name[0] == '.') | |
250 | continue; | |
251 | namelen = strlen(de->d_name); | |
252 | if (namelen > 255) | |
253 | continue; | |
254 | if (has_extension(de->d_name, ".lock")) | |
255 | continue; | |
ed378ec7 LT |
256 | memcpy(ref + baselen, de->d_name, namelen+1); |
257 | if (stat(git_path("%s", ref), &st) < 0) | |
e1e22e37 LT |
258 | continue; |
259 | if (S_ISDIR(st.st_mode)) { | |
ed378ec7 | 260 | list = get_ref_dir(ref, list); |
e1e22e37 LT |
261 | continue; |
262 | } | |
8da19775 | 263 | if (!resolve_ref(ref, sha1, 1, &flag)) { |
ed378ec7 | 264 | error("%s points nowhere!", ref); |
e1e22e37 LT |
265 | continue; |
266 | } | |
f4204ab9 | 267 | list = add_ref(ref, sha1, flag, list, NULL); |
e1e22e37 | 268 | } |
ed378ec7 | 269 | free(ref); |
e1e22e37 LT |
270 | closedir(dir); |
271 | } | |
c774aab9 | 272 | return sort_ref_list(list); |
e1e22e37 LT |
273 | } |
274 | ||
275 | static struct ref_list *get_loose_refs(void) | |
276 | { | |
5e290ff7 JH |
277 | if (!cached_refs.did_loose) { |
278 | cached_refs.loose = get_ref_dir("refs", NULL); | |
279 | cached_refs.did_loose = 1; | |
e1e22e37 | 280 | } |
5e290ff7 | 281 | return cached_refs.loose; |
e1e22e37 LT |
282 | } |
283 | ||
ca8db142 LT |
284 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
285 | #define MAXDEPTH 5 | |
0ebde32c LT |
286 | #define MAXREFLEN (1024) |
287 | ||
288 | static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result) | |
289 | { | |
290 | FILE *f; | |
291 | struct cached_refs refs; | |
292 | struct ref_list *ref; | |
293 | int retval; | |
294 | ||
295 | strcpy(name + pathlen, "packed-refs"); | |
296 | f = fopen(name, "r"); | |
297 | if (!f) | |
298 | return -1; | |
299 | read_packed_refs(f, &refs); | |
300 | fclose(f); | |
301 | ref = refs.packed; | |
302 | retval = -1; | |
303 | while (ref) { | |
304 | if (!strcmp(ref->name, refname)) { | |
305 | retval = 0; | |
306 | memcpy(result, ref->sha1, 20); | |
307 | break; | |
308 | } | |
309 | ref = ref->next; | |
310 | } | |
311 | free_ref_list(refs.packed); | |
312 | return retval; | |
313 | } | |
314 | ||
315 | static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion) | |
316 | { | |
317 | int fd, len = strlen(refname); | |
318 | char buffer[128], *p; | |
319 | ||
320 | if (recursion > MAXDEPTH || len > MAXREFLEN) | |
321 | return -1; | |
322 | memcpy(name + pathlen, refname, len+1); | |
323 | fd = open(name, O_RDONLY); | |
324 | if (fd < 0) | |
325 | return resolve_gitlink_packed_ref(name, pathlen, refname, result); | |
326 | ||
327 | len = read(fd, buffer, sizeof(buffer)-1); | |
328 | close(fd); | |
329 | if (len < 0) | |
330 | return -1; | |
331 | while (len && isspace(buffer[len-1])) | |
332 | len--; | |
333 | buffer[len] = 0; | |
334 | ||
335 | /* Was it a detached head or an old-fashioned symlink? */ | |
336 | if (!get_sha1_hex(buffer, result)) | |
337 | return 0; | |
338 | ||
339 | /* Symref? */ | |
340 | if (strncmp(buffer, "ref:", 4)) | |
341 | return -1; | |
342 | p = buffer + 4; | |
343 | while (isspace(*p)) | |
344 | p++; | |
345 | ||
346 | return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1); | |
347 | } | |
348 | ||
349 | int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result) | |
350 | { | |
351 | int len = strlen(path), retval; | |
352 | char *gitdir; | |
353 | ||
354 | while (len && path[len-1] == '/') | |
355 | len--; | |
356 | if (!len) | |
357 | return -1; | |
358 | gitdir = xmalloc(len + MAXREFLEN + 8); | |
359 | memcpy(gitdir, path, len); | |
360 | memcpy(gitdir + len, "/.git/", 7); | |
361 | ||
362 | retval = resolve_gitlink_ref_recursive(gitdir, len+6, refname, result, 0); | |
363 | free(gitdir); | |
364 | return retval; | |
365 | } | |
ca8db142 | 366 | |
8da19775 | 367 | const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 368 | { |
a876ed83 JH |
369 | int depth = MAXDEPTH, len; |
370 | char buffer[256]; | |
ed378ec7 | 371 | static char ref_buffer[256]; |
ca8db142 | 372 | |
8da19775 JH |
373 | if (flag) |
374 | *flag = 0; | |
375 | ||
a876ed83 | 376 | for (;;) { |
ed378ec7 | 377 | const char *path = git_path("%s", ref); |
a876ed83 JH |
378 | struct stat st; |
379 | char *buf; | |
380 | int fd; | |
8a65ff76 | 381 | |
a876ed83 JH |
382 | if (--depth < 0) |
383 | return NULL; | |
ca8db142 | 384 | |
a876ed83 JH |
385 | /* Special case: non-existing file. |
386 | * Not having the refs/heads/new-branch is OK | |
387 | * if we are writing into it, so is .git/HEAD | |
388 | * that points at refs/heads/master still to be | |
389 | * born. It is NOT OK if we are resolving for | |
390 | * reading. | |
391 | */ | |
392 | if (lstat(path, &st) < 0) { | |
434cd0cd LT |
393 | struct ref_list *list = get_packed_refs(); |
394 | while (list) { | |
f4204ab9 | 395 | if (!strcmp(ref, list->name)) { |
434cd0cd | 396 | hashcpy(sha1, list->sha1); |
8da19775 JH |
397 | if (flag) |
398 | *flag |= REF_ISPACKED; | |
434cd0cd LT |
399 | return ref; |
400 | } | |
401 | list = list->next; | |
402 | } | |
a876ed83 JH |
403 | if (reading || errno != ENOENT) |
404 | return NULL; | |
e702496e | 405 | hashclr(sha1); |
ed378ec7 | 406 | return ref; |
a876ed83 | 407 | } |
ca8db142 | 408 | |
a876ed83 JH |
409 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
410 | if (S_ISLNK(st.st_mode)) { | |
411 | len = readlink(path, buffer, sizeof(buffer)-1); | |
412 | if (len >= 5 && !memcmp("refs/", buffer, 5)) { | |
ed378ec7 LT |
413 | buffer[len] = 0; |
414 | strcpy(ref_buffer, buffer); | |
415 | ref = ref_buffer; | |
8da19775 JH |
416 | if (flag) |
417 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
418 | continue; |
419 | } | |
ca8db142 | 420 | } |
a876ed83 | 421 | |
7a21632f DS |
422 | /* Is it a directory? */ |
423 | if (S_ISDIR(st.st_mode)) { | |
424 | errno = EISDIR; | |
425 | return NULL; | |
426 | } | |
427 | ||
a876ed83 JH |
428 | /* |
429 | * Anything else, just open it and try to use it as | |
430 | * a ref | |
431 | */ | |
432 | fd = open(path, O_RDONLY); | |
433 | if (fd < 0) | |
434 | return NULL; | |
93d26e4c | 435 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
a876ed83 JH |
436 | close(fd); |
437 | ||
438 | /* | |
439 | * Is it a symbolic ref? | |
440 | */ | |
441 | if (len < 4 || memcmp("ref:", buffer, 4)) | |
442 | break; | |
443 | buf = buffer + 4; | |
444 | len -= 4; | |
445 | while (len && isspace(*buf)) | |
446 | buf++, len--; | |
447 | while (len && isspace(buf[len-1])) | |
ed378ec7 LT |
448 | len--; |
449 | buf[len] = 0; | |
450 | memcpy(ref_buffer, buf, len + 1); | |
451 | ref = ref_buffer; | |
8da19775 JH |
452 | if (flag) |
453 | *flag |= REF_ISSYMREF; | |
8a65ff76 | 454 | } |
a876ed83 JH |
455 | if (len < 40 || get_sha1_hex(buffer, sha1)) |
456 | return NULL; | |
ed378ec7 | 457 | return ref; |
a876ed83 JH |
458 | } |
459 | ||
ed378ec7 | 460 | int read_ref(const char *ref, unsigned char *sha1) |
a876ed83 | 461 | { |
8da19775 | 462 | if (resolve_ref(ref, sha1, 1, NULL)) |
a876ed83 JH |
463 | return 0; |
464 | return -1; | |
8a65ff76 LT |
465 | } |
466 | ||
ef06b918 JH |
467 | static int do_one_ref(const char *base, each_ref_fn fn, int trim, |
468 | void *cb_data, struct ref_list *entry) | |
469 | { | |
470 | if (strncmp(base, entry->name, trim)) | |
471 | return 0; | |
472 | if (is_null_sha1(entry->sha1)) | |
473 | return 0; | |
474 | if (!has_sha1_file(entry->sha1)) { | |
475 | error("%s does not point to a valid object!", entry->name); | |
476 | return 0; | |
477 | } | |
478 | return fn(entry->name + trim, entry->sha1, entry->flag, cb_data); | |
479 | } | |
480 | ||
cf0adba7 JH |
481 | int peel_ref(const char *ref, unsigned char *sha1) |
482 | { | |
483 | int flag; | |
484 | unsigned char base[20]; | |
485 | struct object *o; | |
486 | ||
487 | if (!resolve_ref(ref, base, 1, &flag)) | |
488 | return -1; | |
489 | ||
490 | if ((flag & REF_ISPACKED)) { | |
491 | struct ref_list *list = get_packed_refs(); | |
cf0adba7 JH |
492 | |
493 | while (list) { | |
f4204ab9 JH |
494 | if (!strcmp(list->name, ref)) { |
495 | if (list->flag & REF_KNOWS_PEELED) { | |
496 | hashcpy(sha1, list->peeled); | |
497 | return 0; | |
498 | } | |
499 | /* older pack-refs did not leave peeled ones */ | |
500 | break; | |
cf0adba7 JH |
501 | } |
502 | list = list->next; | |
503 | } | |
cf0adba7 JH |
504 | } |
505 | ||
f4204ab9 | 506 | /* fallback - callers should not call this for unpacked refs */ |
cf0adba7 JH |
507 | o = parse_object(base); |
508 | if (o->type == OBJ_TAG) { | |
509 | o = deref_tag(o, ref, 0); | |
510 | if (o) { | |
511 | hashcpy(sha1, o->sha1); | |
512 | return 0; | |
513 | } | |
514 | } | |
515 | return -1; | |
516 | } | |
517 | ||
8da19775 JH |
518 | static int do_for_each_ref(const char *base, each_ref_fn fn, int trim, |
519 | void *cb_data) | |
8a65ff76 | 520 | { |
e1e22e37 LT |
521 | int retval; |
522 | struct ref_list *packed = get_packed_refs(); | |
523 | struct ref_list *loose = get_loose_refs(); | |
8a65ff76 | 524 | |
e1e22e37 LT |
525 | while (packed && loose) { |
526 | struct ref_list *entry; | |
527 | int cmp = strcmp(packed->name, loose->name); | |
528 | if (!cmp) { | |
529 | packed = packed->next; | |
530 | continue; | |
6cada6a9 | 531 | } |
e1e22e37 LT |
532 | if (cmp > 0) { |
533 | entry = loose; | |
534 | loose = loose->next; | |
535 | } else { | |
536 | entry = packed; | |
537 | packed = packed->next; | |
538 | } | |
ef06b918 | 539 | retval = do_one_ref(base, fn, trim, cb_data, entry); |
e1e22e37 LT |
540 | if (retval) |
541 | return retval; | |
542 | } | |
8a65ff76 | 543 | |
ef06b918 JH |
544 | for (packed = packed ? packed : loose; packed; packed = packed->next) { |
545 | retval = do_one_ref(base, fn, trim, cb_data, packed); | |
546 | if (retval) | |
547 | return retval; | |
8a65ff76 | 548 | } |
e1e22e37 | 549 | return 0; |
8a65ff76 LT |
550 | } |
551 | ||
cb5d709f | 552 | int head_ref(each_ref_fn fn, void *cb_data) |
723c31fe LT |
553 | { |
554 | unsigned char sha1[20]; | |
8da19775 JH |
555 | int flag; |
556 | ||
557 | if (resolve_ref("HEAD", sha1, 1, &flag)) | |
558 | return fn("HEAD", sha1, flag, cb_data); | |
2f34ba32 | 559 | return 0; |
723c31fe LT |
560 | } |
561 | ||
cb5d709f | 562 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 563 | { |
cb5d709f | 564 | return do_for_each_ref("refs/", fn, 0, cb_data); |
a62be77f SE |
565 | } |
566 | ||
cb5d709f | 567 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 568 | { |
cb5d709f | 569 | return do_for_each_ref("refs/tags/", fn, 10, cb_data); |
a62be77f SE |
570 | } |
571 | ||
cb5d709f | 572 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 573 | { |
cb5d709f | 574 | return do_for_each_ref("refs/heads/", fn, 11, cb_data); |
a62be77f SE |
575 | } |
576 | ||
cb5d709f | 577 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 578 | { |
cb5d709f | 579 | return do_for_each_ref("refs/remotes/", fn, 13, cb_data); |
8a65ff76 LT |
580 | } |
581 | ||
cb5d709f JH |
582 | /* NEEDSWORK: This is only used by ssh-upload and it should go; the |
583 | * caller should do resolve_ref or read_ref like everybody else. Or | |
584 | * maybe everybody else should use get_ref_sha1() instead of doing | |
585 | * read_ref(). | |
586 | */ | |
95fc7512 DB |
587 | int get_ref_sha1(const char *ref, unsigned char *sha1) |
588 | { | |
95fc7512 DB |
589 | if (check_ref_format(ref)) |
590 | return -1; | |
ed378ec7 | 591 | return read_ref(mkpath("refs/%s", ref), sha1); |
95fc7512 DB |
592 | } |
593 | ||
03feddd6 JH |
594 | /* |
595 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
596 | * We do not like it if: | |
597 | * | |
598 | * - any path component of it begins with ".", or | |
599 | * - it has double dots "..", or | |
600 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
601 | * - it ends with a "/". | |
602 | */ | |
603 | ||
604 | static inline int bad_ref_char(int ch) | |
605 | { | |
8558fd9e DB |
606 | if (((unsigned) ch) <= ' ' || |
607 | ch == '~' || ch == '^' || ch == ':') | |
608 | return 1; | |
609 | /* 2.13 Pattern Matching Notation */ | |
610 | if (ch == '?' || ch == '[') /* Unsupported */ | |
611 | return 1; | |
612 | if (ch == '*') /* Supported at the end */ | |
613 | return 2; | |
614 | return 0; | |
03feddd6 JH |
615 | } |
616 | ||
95fc7512 DB |
617 | int check_ref_format(const char *ref) |
618 | { | |
8558fd9e | 619 | int ch, level, bad_type; |
03feddd6 JH |
620 | const char *cp = ref; |
621 | ||
622 | level = 0; | |
623 | while (1) { | |
624 | while ((ch = *cp++) == '/') | |
625 | ; /* tolerate duplicated slashes */ | |
626 | if (!ch) | |
627 | return -1; /* should not end with slashes */ | |
628 | ||
629 | /* we are at the beginning of the path component */ | |
8558fd9e | 630 | if (ch == '.') |
03feddd6 | 631 | return -1; |
8558fd9e DB |
632 | bad_type = bad_ref_char(ch); |
633 | if (bad_type) { | |
634 | return (bad_type == 2 && !*cp) ? -3 : -1; | |
635 | } | |
03feddd6 JH |
636 | |
637 | /* scan the rest of the path component */ | |
638 | while ((ch = *cp++) != 0) { | |
8558fd9e DB |
639 | bad_type = bad_ref_char(ch); |
640 | if (bad_type) { | |
641 | return (bad_type == 2 && !*cp) ? -3 : -1; | |
642 | } | |
03feddd6 JH |
643 | if (ch == '/') |
644 | break; | |
645 | if (ch == '.' && *cp == '.') | |
646 | return -1; | |
647 | } | |
648 | level++; | |
649 | if (!ch) { | |
650 | if (level < 2) | |
37adac76 | 651 | return -2; /* at least of form "heads/blah" */ |
03feddd6 JH |
652 | return 0; |
653 | } | |
654 | } | |
95fc7512 DB |
655 | } |
656 | ||
e5f38ec3 | 657 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
658 | const unsigned char *old_sha1, int mustexist) |
659 | { | |
8da19775 | 660 | if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 661 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
662 | unlock_ref(lock); |
663 | return NULL; | |
664 | } | |
a89fccd2 | 665 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 666 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
667 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
668 | unlock_ref(lock); | |
669 | return NULL; | |
670 | } | |
671 | return lock; | |
672 | } | |
673 | ||
bc7127ef JH |
674 | static int remove_empty_dir_recursive(char *path, int len) |
675 | { | |
676 | DIR *dir = opendir(path); | |
677 | struct dirent *e; | |
678 | int ret = 0; | |
679 | ||
680 | if (!dir) | |
681 | return -1; | |
682 | if (path[len-1] != '/') | |
683 | path[len++] = '/'; | |
684 | while ((e = readdir(dir)) != NULL) { | |
685 | struct stat st; | |
686 | int namlen; | |
687 | if ((e->d_name[0] == '.') && | |
688 | ((e->d_name[1] == 0) || | |
689 | ((e->d_name[1] == '.') && e->d_name[2] == 0))) | |
690 | continue; /* "." and ".." */ | |
691 | ||
692 | namlen = strlen(e->d_name); | |
693 | if ((len + namlen < PATH_MAX) && | |
694 | strcpy(path + len, e->d_name) && | |
695 | !lstat(path, &st) && | |
696 | S_ISDIR(st.st_mode) && | |
28bed6ea | 697 | !remove_empty_dir_recursive(path, len + namlen)) |
bc7127ef JH |
698 | continue; /* happy */ |
699 | ||
700 | /* path too long, stat fails, or non-directory still exists */ | |
701 | ret = -1; | |
702 | break; | |
703 | } | |
704 | closedir(dir); | |
705 | if (!ret) { | |
706 | path[len] = 0; | |
707 | ret = rmdir(path); | |
708 | } | |
709 | return ret; | |
710 | } | |
711 | ||
712 | static int remove_empty_directories(char *file) | |
713 | { | |
714 | /* we want to create a file but there is a directory there; | |
715 | * if that is an empty directory (or a directory that contains | |
716 | * only empty directories), remove them. | |
717 | */ | |
718 | char path[PATH_MAX]; | |
719 | int len = strlen(file); | |
720 | ||
721 | if (len >= PATH_MAX) /* path too long ;-) */ | |
722 | return -1; | |
723 | strcpy(path, file); | |
724 | return remove_empty_dir_recursive(path, len); | |
725 | } | |
726 | ||
c976d415 LH |
727 | static int is_refname_available(const char *ref, const char *oldref, |
728 | struct ref_list *list, int quiet) | |
729 | { | |
730 | int namlen = strlen(ref); /* e.g. 'foo/bar' */ | |
731 | while (list) { | |
732 | /* list->name could be 'foo' or 'foo/bar/baz' */ | |
733 | if (!oldref || strcmp(oldref, list->name)) { | |
734 | int len = strlen(list->name); | |
735 | int cmplen = (namlen < len) ? namlen : len; | |
736 | const char *lead = (namlen < len) ? list->name : ref; | |
737 | if (!strncmp(ref, list->name, cmplen) && | |
738 | lead[cmplen] == '/') { | |
739 | if (!quiet) | |
740 | error("'%s' exists; cannot create '%s'", | |
741 | list->name, ref); | |
742 | return 0; | |
743 | } | |
744 | } | |
745 | list = list->next; | |
746 | } | |
747 | return 1; | |
748 | } | |
749 | ||
68db31cc | 750 | static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p) |
4bd18c43 | 751 | { |
434cd0cd | 752 | char *ref_file; |
ed378ec7 | 753 | const char *orig_ref = ref; |
4bd18c43 | 754 | struct ref_lock *lock; |
732232a1 | 755 | struct stat st; |
5cc3cef9 | 756 | int last_errno = 0; |
68db31cc | 757 | int type; |
4431fcc4 | 758 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
4bd18c43 SP |
759 | |
760 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
761 | lock->lock_fd = -1; | |
762 | ||
68db31cc | 763 | ref = resolve_ref(ref, lock->old_sha1, mustexist, &type); |
bc7127ef JH |
764 | if (!ref && errno == EISDIR) { |
765 | /* we are trying to lock foo but we used to | |
766 | * have foo/bar which now does not exist; | |
767 | * it is normal for the empty directory 'foo' | |
768 | * to remain. | |
769 | */ | |
770 | ref_file = git_path("%s", orig_ref); | |
5cc3cef9 JH |
771 | if (remove_empty_directories(ref_file)) { |
772 | last_errno = errno; | |
773 | error("there are still refs under '%s'", orig_ref); | |
774 | goto error_return; | |
775 | } | |
68db31cc | 776 | ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type); |
bc7127ef | 777 | } |
68db31cc SV |
778 | if (type_p) |
779 | *type_p = type; | |
ed378ec7 | 780 | if (!ref) { |
5cc3cef9 | 781 | last_errno = errno; |
818f477c | 782 | error("unable to resolve reference %s: %s", |
ed378ec7 | 783 | orig_ref, strerror(errno)); |
5cc3cef9 | 784 | goto error_return; |
4bd18c43 | 785 | } |
c976d415 LH |
786 | /* When the ref did not exist and we are creating it, |
787 | * make sure there is no existing ref that is packed | |
788 | * whose name begins with our refname, nor a ref whose | |
789 | * name is a proper prefix of our refname. | |
790 | */ | |
791 | if (is_null_sha1(lock->old_sha1) && | |
792 | !is_refname_available(ref, NULL, get_packed_refs(), 0)) | |
793 | goto error_return; | |
22a3844e | 794 | |
c33d5174 | 795 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 796 | |
68db31cc SV |
797 | if (flags & REF_NODEREF) |
798 | ref = orig_ref; | |
434cd0cd | 799 | lock->ref_name = xstrdup(ref); |
1655707c | 800 | lock->orig_ref_name = xstrdup(orig_ref); |
7c1a278d | 801 | ref_file = git_path("%s", ref); |
68db31cc SV |
802 | if (lstat(ref_file, &st) && errno == ENOENT) |
803 | lock->force_write = 1; | |
804 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
805 | lock->force_write = 1; | |
4bd18c43 | 806 | |
5cc3cef9 JH |
807 | if (safe_create_leading_directories(ref_file)) { |
808 | last_errno = errno; | |
809 | error("unable to create directory for %s", ref_file); | |
810 | goto error_return; | |
811 | } | |
434cd0cd | 812 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, 1); |
4bd18c43 SP |
813 | |
814 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; | |
5cc3cef9 JH |
815 | |
816 | error_return: | |
817 | unlock_ref(lock); | |
818 | errno = last_errno; | |
819 | return NULL; | |
4bd18c43 SP |
820 | } |
821 | ||
4431fcc4 | 822 | struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1) |
95fc7512 | 823 | { |
53cce84c | 824 | char refpath[PATH_MAX]; |
95fc7512 | 825 | if (check_ref_format(ref)) |
4bd18c43 | 826 | return NULL; |
53cce84c | 827 | strcpy(refpath, mkpath("refs/%s", ref)); |
68db31cc | 828 | return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL); |
4bd18c43 SP |
829 | } |
830 | ||
68db31cc | 831 | struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags) |
4bd18c43 | 832 | { |
a2f9fe92 JH |
833 | if (check_ref_format(ref) == -1) |
834 | return NULL; | |
68db31cc | 835 | return lock_ref_sha1_basic(ref, old_sha1, flags, NULL); |
c0277d15 JH |
836 | } |
837 | ||
26a063a1 JH |
838 | static struct lock_file packlock; |
839 | ||
c0277d15 JH |
840 | static int repack_without_ref(const char *refname) |
841 | { | |
842 | struct ref_list *list, *packed_ref_list; | |
843 | int fd; | |
844 | int found = 0; | |
c0277d15 JH |
845 | |
846 | packed_ref_list = get_packed_refs(); | |
847 | for (list = packed_ref_list; list; list = list->next) { | |
848 | if (!strcmp(refname, list->name)) { | |
849 | found = 1; | |
850 | break; | |
851 | } | |
852 | } | |
853 | if (!found) | |
854 | return 0; | |
c0277d15 JH |
855 | fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0); |
856 | if (fd < 0) | |
857 | return error("cannot delete '%s' from packed refs", refname); | |
858 | ||
859 | for (list = packed_ref_list; list; list = list->next) { | |
860 | char line[PATH_MAX + 100]; | |
861 | int len; | |
862 | ||
863 | if (!strcmp(refname, list->name)) | |
864 | continue; | |
865 | len = snprintf(line, sizeof(line), "%s %s\n", | |
866 | sha1_to_hex(list->sha1), list->name); | |
867 | /* this should not happen but just being defensive */ | |
868 | if (len > sizeof(line)) | |
869 | die("too long a refname '%s'", list->name); | |
870 | write_or_die(fd, line, len); | |
871 | } | |
872 | return commit_lock_file(&packlock); | |
873 | } | |
874 | ||
1401f46b | 875 | int delete_ref(const char *refname, const unsigned char *sha1) |
c0277d15 JH |
876 | { |
877 | struct ref_lock *lock; | |
878 | int err, i, ret = 0, flag = 0; | |
879 | ||
68db31cc | 880 | lock = lock_ref_sha1_basic(refname, sha1, 0, &flag); |
c0277d15 JH |
881 | if (!lock) |
882 | return 1; | |
883 | if (!(flag & REF_ISPACKED)) { | |
884 | /* loose */ | |
885 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
886 | lock->lk->filename[i] = 0; | |
887 | err = unlink(lock->lk->filename); | |
888 | if (err) { | |
889 | ret = 1; | |
890 | error("unlink(%s) failed: %s", | |
891 | lock->lk->filename, strerror(errno)); | |
892 | } | |
893 | lock->lk->filename[i] = '.'; | |
894 | } | |
895 | /* removing the loose one could have resurrected an earlier | |
896 | * packed one. Also, if it was not loose we need to repack | |
897 | * without it. | |
898 | */ | |
899 | ret |= repack_without_ref(refname); | |
900 | ||
9a13f0b7 | 901 | err = unlink(git_path("logs/%s", lock->ref_name)); |
c0277d15 JH |
902 | if (err && errno != ENOENT) |
903 | fprintf(stderr, "warning: unlink(%s) failed: %s", | |
9a13f0b7 | 904 | git_path("logs/%s", lock->ref_name), strerror(errno)); |
c0277d15 JH |
905 | invalidate_cached_refs(); |
906 | unlock_ref(lock); | |
907 | return ret; | |
4bd18c43 SP |
908 | } |
909 | ||
678d0f4c | 910 | int rename_ref(const char *oldref, const char *newref, const char *logmsg) |
c976d415 LH |
911 | { |
912 | static const char renamed_ref[] = "RENAMED-REF"; | |
913 | unsigned char sha1[20], orig_sha1[20]; | |
914 | int flag = 0, logmoved = 0; | |
915 | struct ref_lock *lock; | |
c976d415 | 916 | struct stat loginfo; |
16c2bfbb | 917 | int log = !lstat(git_path("logs/%s", oldref), &loginfo); |
c976d415 LH |
918 | |
919 | if (S_ISLNK(loginfo.st_mode)) | |
920 | return error("reflog for %s is a symlink", oldref); | |
921 | ||
922 | if (!resolve_ref(oldref, orig_sha1, 1, &flag)) | |
923 | return error("refname %s not found", oldref); | |
924 | ||
925 | if (!is_refname_available(newref, oldref, get_packed_refs(), 0)) | |
926 | return 1; | |
927 | ||
928 | if (!is_refname_available(newref, oldref, get_loose_refs(), 0)) | |
929 | return 1; | |
930 | ||
68db31cc | 931 | lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL); |
c976d415 LH |
932 | if (!lock) |
933 | return error("unable to lock %s", renamed_ref); | |
934 | lock->force_write = 1; | |
678d0f4c | 935 | if (write_ref_sha1(lock, orig_sha1, logmsg)) |
c976d415 LH |
936 | return error("unable to save current sha1 in %s", renamed_ref); |
937 | ||
938 | if (log && rename(git_path("logs/%s", oldref), git_path("tmp-renamed-log"))) | |
939 | return error("unable to move logfile logs/%s to tmp-renamed-log: %s", | |
940 | oldref, strerror(errno)); | |
941 | ||
942 | if (delete_ref(oldref, orig_sha1)) { | |
943 | error("unable to delete old %s", oldref); | |
944 | goto rollback; | |
945 | } | |
946 | ||
947 | if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1)) { | |
948 | if (errno==EISDIR) { | |
949 | if (remove_empty_directories(git_path("%s", newref))) { | |
950 | error("Directory not empty: %s", newref); | |
951 | goto rollback; | |
952 | } | |
953 | } else { | |
954 | error("unable to delete existing %s", newref); | |
955 | goto rollback; | |
956 | } | |
957 | } | |
958 | ||
959 | if (log && safe_create_leading_directories(git_path("logs/%s", newref))) { | |
960 | error("unable to create directory for %s", newref); | |
961 | goto rollback; | |
962 | } | |
963 | ||
964 | retry: | |
965 | if (log && rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref))) { | |
d9e74d57 JR |
966 | if (errno==EISDIR || errno==ENOTDIR) { |
967 | /* | |
968 | * rename(a, b) when b is an existing | |
969 | * directory ought to result in ISDIR, but | |
970 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
971 | */ | |
c976d415 LH |
972 | if (remove_empty_directories(git_path("logs/%s", newref))) { |
973 | error("Directory not empty: logs/%s", newref); | |
974 | goto rollback; | |
975 | } | |
976 | goto retry; | |
977 | } else { | |
978 | error("unable to move logfile tmp-renamed-log to logs/%s: %s", | |
979 | newref, strerror(errno)); | |
980 | goto rollback; | |
981 | } | |
982 | } | |
983 | logmoved = log; | |
984 | ||
68db31cc | 985 | lock = lock_ref_sha1_basic(newref, NULL, 0, NULL); |
c976d415 LH |
986 | if (!lock) { |
987 | error("unable to lock %s for update", newref); | |
988 | goto rollback; | |
989 | } | |
990 | ||
991 | lock->force_write = 1; | |
992 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 993 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
c976d415 LH |
994 | error("unable to write current sha1 into %s", newref); |
995 | goto rollback; | |
996 | } | |
997 | ||
998 | return 0; | |
999 | ||
1000 | rollback: | |
68db31cc | 1001 | lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL); |
c976d415 LH |
1002 | if (!lock) { |
1003 | error("unable to lock %s for rollback", oldref); | |
1004 | goto rollbacklog; | |
1005 | } | |
1006 | ||
1007 | lock->force_write = 1; | |
1008 | flag = log_all_ref_updates; | |
1009 | log_all_ref_updates = 0; | |
1010 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
1011 | error("unable to write current sha1 into %s", oldref); | |
1012 | log_all_ref_updates = flag; | |
1013 | ||
1014 | rollbacklog: | |
1015 | if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref))) | |
1016 | error("unable to restore logfile %s from %s: %s", | |
1017 | oldref, newref, strerror(errno)); | |
1018 | if (!logmoved && log && | |
1019 | rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref))) | |
1020 | error("unable to restore logfile %s from tmp-renamed-log: %s", | |
1021 | oldref, strerror(errno)); | |
1022 | ||
1023 | return 1; | |
1024 | } | |
1025 | ||
e5f38ec3 | 1026 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 SP |
1027 | { |
1028 | if (lock->lock_fd >= 0) { | |
1029 | close(lock->lock_fd); | |
c33d5174 JH |
1030 | /* Do not free lock->lk -- atexit() still looks at them */ |
1031 | if (lock->lk) | |
1032 | rollback_lock_file(lock->lk); | |
4bd18c43 | 1033 | } |
434cd0cd | 1034 | free(lock->ref_name); |
1655707c | 1035 | free(lock->orig_ref_name); |
4bd18c43 SP |
1036 | free(lock); |
1037 | } | |
1038 | ||
9a13f0b7 NP |
1039 | static int log_ref_write(const char *ref_name, const unsigned char *old_sha1, |
1040 | const unsigned char *new_sha1, const char *msg) | |
6de08ae6 SP |
1041 | { |
1042 | int logfd, written, oflags = O_APPEND | O_WRONLY; | |
1043 | unsigned maxlen, len; | |
8ac65937 | 1044 | int msglen; |
9a13f0b7 | 1045 | char *log_file, *logrec; |
ff4c8485 | 1046 | const char *committer; |
6de08ae6 | 1047 | |
510c5a8e | 1048 | if (log_all_ref_updates < 0) |
7d1864ce | 1049 | log_all_ref_updates = !is_bare_repository(); |
510c5a8e | 1050 | |
9a13f0b7 NP |
1051 | log_file = git_path("logs/%s", ref_name); |
1052 | ||
4057deb5 | 1053 | if (log_all_ref_updates && |
cc44c765 JH |
1054 | (!prefixcmp(ref_name, "refs/heads/") || |
1055 | !prefixcmp(ref_name, "refs/remotes/") || | |
bd104db1 | 1056 | !strcmp(ref_name, "HEAD"))) { |
9a13f0b7 | 1057 | if (safe_create_leading_directories(log_file) < 0) |
6de08ae6 | 1058 | return error("unable to create directory for %s", |
9a13f0b7 | 1059 | log_file); |
6de08ae6 SP |
1060 | oflags |= O_CREAT; |
1061 | } | |
1062 | ||
9a13f0b7 | 1063 | logfd = open(log_file, oflags, 0666); |
6de08ae6 | 1064 | if (logfd < 0) { |
1974bf62 | 1065 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 1066 | return 0; |
3b463c3f JH |
1067 | |
1068 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
9a13f0b7 | 1069 | if (remove_empty_directories(log_file)) { |
3b463c3f | 1070 | return error("There are still logs under '%s'", |
9a13f0b7 | 1071 | log_file); |
3b463c3f | 1072 | } |
9a13f0b7 | 1073 | logfd = open(log_file, oflags, 0666); |
3b463c3f JH |
1074 | } |
1075 | ||
1076 | if (logfd < 0) | |
1077 | return error("Unable to append to %s: %s", | |
9a13f0b7 | 1078 | log_file, strerror(errno)); |
6de08ae6 SP |
1079 | } |
1080 | ||
443b92b6 MK |
1081 | adjust_shared_perm(log_file); |
1082 | ||
8ac65937 | 1083 | msglen = 0; |
6de08ae6 | 1084 | if (msg) { |
8ac65937 JH |
1085 | /* clean up the message and make sure it is a single line */ |
1086 | for ( ; *msg; msg++) | |
1087 | if (!isspace(*msg)) | |
1088 | break; | |
1089 | if (*msg) { | |
1090 | const char *ep = strchr(msg, '\n'); | |
1091 | if (ep) | |
1092 | msglen = ep - msg; | |
1093 | else | |
1094 | msglen = strlen(msg); | |
1095 | } | |
6de08ae6 | 1096 | } |
8ac65937 JH |
1097 | |
1098 | committer = git_committer_info(-1); | |
1099 | maxlen = strlen(committer) + msglen + 100; | |
1100 | logrec = xmalloc(maxlen); | |
1101 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
1102 | sha1_to_hex(old_sha1), |
1103 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
1104 | committer); |
1105 | if (msglen) | |
1106 | len += sprintf(logrec + len - 1, "\t%.*s\n", msglen, msg) - 1; | |
93822c22 | 1107 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 SP |
1108 | free(logrec); |
1109 | close(logfd); | |
1110 | if (written != len) | |
9a13f0b7 | 1111 | return error("Unable to append to %s", log_file); |
6de08ae6 SP |
1112 | return 0; |
1113 | } | |
1114 | ||
4bd18c43 SP |
1115 | int write_ref_sha1(struct ref_lock *lock, |
1116 | const unsigned char *sha1, const char *logmsg) | |
1117 | { | |
1118 | static char term = '\n'; | |
1119 | ||
1120 | if (!lock) | |
95fc7512 | 1121 | return -1; |
a89fccd2 | 1122 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
1123 | unlock_ref(lock); |
1124 | return 0; | |
95fc7512 | 1125 | } |
93822c22 AW |
1126 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
1127 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
4bd18c43 | 1128 | || close(lock->lock_fd) < 0) { |
c33d5174 | 1129 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
1130 | unlock_ref(lock); |
1131 | return -1; | |
1132 | } | |
5e290ff7 | 1133 | invalidate_cached_refs(); |
bd104db1 NP |
1134 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
1135 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
1136 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
1137 | unlock_ref(lock); |
1138 | return -1; | |
1139 | } | |
605fac8b NP |
1140 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
1141 | /* | |
1142 | * Special hack: If a branch is updated directly and HEAD | |
1143 | * points to it (may happen on the remote side of a push | |
1144 | * for example) then logically the HEAD reflog should be | |
1145 | * updated too. | |
1146 | * A generic solution implies reverse symref information, | |
1147 | * but finding all symrefs pointing to the given branch | |
1148 | * would be rather costly for this rare event (the direct | |
1149 | * update of a branch) to be worth it. So let's cheat and | |
1150 | * check with HEAD only which should cover 99% of all usage | |
1151 | * scenarios (even 100% of the default ones). | |
1152 | */ | |
1153 | unsigned char head_sha1[20]; | |
1154 | int head_flag; | |
1155 | const char *head_ref; | |
1156 | head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag); | |
1157 | if (head_ref && (head_flag & REF_ISSYMREF) && | |
1158 | !strcmp(head_ref, lock->ref_name)) | |
1159 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
1160 | } | |
c33d5174 | 1161 | if (commit_lock_file(lock->lk)) { |
434cd0cd | 1162 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
1163 | unlock_ref(lock); |
1164 | return -1; | |
1165 | } | |
1166 | lock->lock_fd = -1; | |
1167 | unlock_ref(lock); | |
1168 | return 0; | |
95fc7512 | 1169 | } |
d556fae2 | 1170 | |
8b5157e4 NP |
1171 | int create_symref(const char *ref_target, const char *refs_heads_master, |
1172 | const char *logmsg) | |
41b625b0 NP |
1173 | { |
1174 | const char *lockpath; | |
1175 | char ref[1000]; | |
1176 | int fd, len, written; | |
47fc52e2 | 1177 | char *git_HEAD = xstrdup(git_path("%s", ref_target)); |
8b5157e4 NP |
1178 | unsigned char old_sha1[20], new_sha1[20]; |
1179 | ||
1180 | if (logmsg && read_ref(ref_target, old_sha1)) | |
1181 | hashclr(old_sha1); | |
41b625b0 | 1182 | |
d48744d1 JH |
1183 | if (safe_create_leading_directories(git_HEAD) < 0) |
1184 | return error("unable to create directory for %s", git_HEAD); | |
1185 | ||
41b625b0 NP |
1186 | #ifndef NO_SYMLINK_HEAD |
1187 | if (prefer_symlink_refs) { | |
1188 | unlink(git_HEAD); | |
1189 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 1190 | goto done; |
41b625b0 NP |
1191 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
1192 | } | |
1193 | #endif | |
1194 | ||
1195 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
1196 | if (sizeof(ref) <= len) { | |
1197 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 1198 | goto error_free_return; |
41b625b0 NP |
1199 | } |
1200 | lockpath = mkpath("%s.lock", git_HEAD); | |
1201 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
1202 | if (fd < 0) { | |
1203 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 1204 | goto error_free_return; |
41b625b0 NP |
1205 | } |
1206 | written = write_in_full(fd, ref, len); | |
1207 | close(fd); | |
1208 | if (written != len) { | |
41b625b0 | 1209 | error("Unable to write to %s", lockpath); |
47fc52e2 | 1210 | goto error_unlink_return; |
41b625b0 NP |
1211 | } |
1212 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 1213 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 1214 | goto error_unlink_return; |
41b625b0 NP |
1215 | } |
1216 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 1217 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 JH |
1218 | error_unlink_return: |
1219 | unlink(lockpath); | |
1220 | error_free_return: | |
1221 | free(git_HEAD); | |
1222 | return -1; | |
41b625b0 | 1223 | } |
8b5157e4 | 1224 | |
ee96d11b | 1225 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 1226 | done: |
ee96d11b | 1227 | #endif |
8b5157e4 NP |
1228 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
1229 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
1230 | ||
47fc52e2 | 1231 | free(git_HEAD); |
41b625b0 NP |
1232 | return 0; |
1233 | } | |
1234 | ||
16d7cc90 JH |
1235 | static char *ref_msg(const char *line, const char *endp) |
1236 | { | |
1237 | const char *ep; | |
1238 | char *msg; | |
1239 | ||
1240 | line += 82; | |
1241 | for (ep = line; ep < endp && *ep != '\n'; ep++) | |
1242 | ; | |
1243 | msg = xmalloc(ep - line + 1); | |
1244 | memcpy(msg, line, ep - line); | |
1245 | msg[ep - line] = 0; | |
1246 | return msg; | |
1247 | } | |
1248 | ||
1249 | 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 | 1250 | { |
e5229042 | 1251 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 | 1252 | char *tz_c; |
e29cb53a | 1253 | int logfd, tz, reccnt = 0; |
d556fae2 SP |
1254 | struct stat st; |
1255 | unsigned long date; | |
e5229042 | 1256 | unsigned char logged_sha1[20]; |
cb48cb58 | 1257 | void *log_mapped; |
dc49cd76 | 1258 | size_t mapsz; |
d556fae2 SP |
1259 | |
1260 | logfile = git_path("logs/%s", ref); | |
1261 | logfd = open(logfile, O_RDONLY, 0); | |
1262 | if (logfd < 0) | |
1263 | die("Unable to read log %s: %s", logfile, strerror(errno)); | |
1264 | fstat(logfd, &st); | |
1265 | if (!st.st_size) | |
1266 | die("Log %s is empty.", logfile); | |
dc49cd76 SP |
1267 | mapsz = xsize_t(st.st_size); |
1268 | log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0); | |
cb48cb58 | 1269 | logdata = log_mapped; |
d556fae2 SP |
1270 | close(logfd); |
1271 | ||
e5229042 | 1272 | lastrec = NULL; |
d556fae2 SP |
1273 | rec = logend = logdata + st.st_size; |
1274 | while (logdata < rec) { | |
e29cb53a | 1275 | reccnt++; |
d556fae2 SP |
1276 | if (logdata < rec && *(rec-1) == '\n') |
1277 | rec--; | |
e5229042 SP |
1278 | lastgt = NULL; |
1279 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 1280 | rec--; |
e5229042 SP |
1281 | if (*rec == '>') |
1282 | lastgt = rec; | |
1283 | } | |
1284 | if (!lastgt) | |
d556fae2 | 1285 | die("Log %s is corrupt.", logfile); |
e5229042 | 1286 | date = strtoul(lastgt + 1, &tz_c, 10); |
ab2a1a32 | 1287 | if (date <= at_time || cnt == 0) { |
76a44c5c | 1288 | tz = strtoul(tz_c, NULL, 10); |
16d7cc90 JH |
1289 | if (msg) |
1290 | *msg = ref_msg(rec, logend); | |
1291 | if (cutoff_time) | |
1292 | *cutoff_time = date; | |
1293 | if (cutoff_tz) | |
1294 | *cutoff_tz = tz; | |
1295 | if (cutoff_cnt) | |
76a44c5c | 1296 | *cutoff_cnt = reccnt - 1; |
e5229042 SP |
1297 | if (lastrec) { |
1298 | if (get_sha1_hex(lastrec, logged_sha1)) | |
1299 | die("Log %s is corrupt.", logfile); | |
1300 | if (get_sha1_hex(rec + 41, sha1)) | |
1301 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1302 | if (hashcmp(logged_sha1, sha1)) { |
e5229042 SP |
1303 | fprintf(stderr, |
1304 | "warning: Log %s has gap after %s.\n", | |
1305 | logfile, show_rfc2822_date(date, tz)); | |
1306 | } | |
e5f38ec3 JH |
1307 | } |
1308 | else if (date == at_time) { | |
e5229042 SP |
1309 | if (get_sha1_hex(rec + 41, sha1)) |
1310 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
1311 | } |
1312 | else { | |
e5229042 SP |
1313 | if (get_sha1_hex(rec + 41, logged_sha1)) |
1314 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1315 | if (hashcmp(logged_sha1, sha1)) { |
e5229042 SP |
1316 | fprintf(stderr, |
1317 | "warning: Log %s unexpectedly ended on %s.\n", | |
1318 | logfile, show_rfc2822_date(date, tz)); | |
1319 | } | |
1320 | } | |
dc49cd76 | 1321 | munmap(log_mapped, mapsz); |
d556fae2 SP |
1322 | return 0; |
1323 | } | |
e5229042 | 1324 | lastrec = rec; |
ab2a1a32 JH |
1325 | if (cnt > 0) |
1326 | cnt--; | |
d556fae2 SP |
1327 | } |
1328 | ||
e5229042 SP |
1329 | rec = logdata; |
1330 | while (rec < logend && *rec != '>' && *rec != '\n') | |
1331 | rec++; | |
1332 | if (rec == logend || *rec == '\n') | |
d556fae2 | 1333 | die("Log %s is corrupt.", logfile); |
e5229042 | 1334 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
1335 | tz = strtoul(tz_c, NULL, 10); |
1336 | if (get_sha1_hex(logdata, sha1)) | |
1337 | die("Log %s is corrupt.", logfile); | |
16d7cc90 JH |
1338 | if (msg) |
1339 | *msg = ref_msg(logdata, logend); | |
dc49cd76 | 1340 | munmap(log_mapped, mapsz); |
16d7cc90 JH |
1341 | |
1342 | if (cutoff_time) | |
1343 | *cutoff_time = date; | |
1344 | if (cutoff_tz) | |
1345 | *cutoff_tz = tz; | |
1346 | if (cutoff_cnt) | |
1347 | *cutoff_cnt = reccnt; | |
1348 | return 1; | |
d556fae2 | 1349 | } |
2ff81662 | 1350 | |
883d60fa | 1351 | int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data) |
2ff81662 JH |
1352 | { |
1353 | const char *logfile; | |
1354 | FILE *logfp; | |
1355 | char buf[1024]; | |
2266bf27 | 1356 | int ret = 0; |
2ff81662 JH |
1357 | |
1358 | logfile = git_path("logs/%s", ref); | |
1359 | logfp = fopen(logfile, "r"); | |
1360 | if (!logfp) | |
883d60fa | 1361 | return -1; |
2ff81662 JH |
1362 | while (fgets(buf, sizeof(buf), logfp)) { |
1363 | unsigned char osha1[20], nsha1[20]; | |
883d60fa JS |
1364 | char *email_end, *message; |
1365 | unsigned long timestamp; | |
2266bf27 | 1366 | int len, tz; |
2ff81662 JH |
1367 | |
1368 | /* old SP new SP name <email> SP time TAB msg LF */ | |
1369 | len = strlen(buf); | |
1370 | if (len < 83 || buf[len-1] != '\n' || | |
1371 | get_sha1_hex(buf, osha1) || buf[40] != ' ' || | |
883d60fa JS |
1372 | get_sha1_hex(buf + 41, nsha1) || buf[81] != ' ' || |
1373 | !(email_end = strchr(buf + 82, '>')) || | |
1374 | email_end[1] != ' ' || | |
1375 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
1376 | !message || message[0] != ' ' || | |
1377 | (message[1] != '+' && message[1] != '-') || | |
1378 | !isdigit(message[2]) || !isdigit(message[3]) || | |
b4dd4856 | 1379 | !isdigit(message[4]) || !isdigit(message[5])) |
2ff81662 | 1380 | continue; /* corrupt? */ |
883d60fa JS |
1381 | email_end[1] = '\0'; |
1382 | tz = strtol(message + 1, NULL, 10); | |
b4dd4856 JS |
1383 | if (message[6] != '\t') |
1384 | message += 6; | |
1385 | else | |
1386 | message += 7; | |
883d60fa JS |
1387 | ret = fn(osha1, nsha1, buf+82, timestamp, tz, message, cb_data); |
1388 | if (ret) | |
2266bf27 | 1389 | break; |
2ff81662 JH |
1390 | } |
1391 | fclose(logfp); | |
2266bf27 | 1392 | return ret; |
2ff81662 | 1393 | } |
e29cb53a | 1394 | |
eb8381c8 NP |
1395 | static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data) |
1396 | { | |
1397 | DIR *dir = opendir(git_path("logs/%s", base)); | |
fcee5a14 | 1398 | int retval = 0; |
eb8381c8 NP |
1399 | |
1400 | if (dir) { | |
1401 | struct dirent *de; | |
1402 | int baselen = strlen(base); | |
1403 | char *log = xmalloc(baselen + 257); | |
1404 | ||
1405 | memcpy(log, base, baselen); | |
1406 | if (baselen && base[baselen-1] != '/') | |
1407 | log[baselen++] = '/'; | |
1408 | ||
1409 | while ((de = readdir(dir)) != NULL) { | |
1410 | struct stat st; | |
1411 | int namelen; | |
1412 | ||
1413 | if (de->d_name[0] == '.') | |
1414 | continue; | |
1415 | namelen = strlen(de->d_name); | |
1416 | if (namelen > 255) | |
1417 | continue; | |
1418 | if (has_extension(de->d_name, ".lock")) | |
1419 | continue; | |
1420 | memcpy(log + baselen, de->d_name, namelen+1); | |
1421 | if (stat(git_path("logs/%s", log), &st) < 0) | |
1422 | continue; | |
1423 | if (S_ISDIR(st.st_mode)) { | |
1424 | retval = do_for_each_reflog(log, fn, cb_data); | |
1425 | } else { | |
1426 | unsigned char sha1[20]; | |
1427 | if (!resolve_ref(log, sha1, 0, NULL)) | |
1428 | retval = error("bad ref for %s", log); | |
1429 | else | |
1430 | retval = fn(log, sha1, 0, cb_data); | |
1431 | } | |
1432 | if (retval) | |
1433 | break; | |
1434 | } | |
1435 | free(log); | |
1436 | closedir(dir); | |
1437 | } | |
acb39f64 | 1438 | else if (*base) |
fcee5a14 | 1439 | return errno; |
eb8381c8 NP |
1440 | return retval; |
1441 | } | |
1442 | ||
1443 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
1444 | { | |
1445 | return do_for_each_reflog("", fn, cb_data); | |
1446 | } |