]>
Commit | Line | Data |
---|---|---|
95fc7512 DB |
1 | #include "refs.h" |
2 | #include "cache.h" | |
3 | ||
4 | #include <errno.h> | |
5 | ||
e1e22e37 LT |
6 | struct ref_list { |
7 | struct ref_list *next; | |
8da19775 | 8 | unsigned char flag; /* ISSYMREF? ISPACKED? */ |
e1e22e37 LT |
9 | unsigned char sha1[20]; |
10 | char name[FLEX_ARRAY]; | |
11 | }; | |
12 | ||
13 | static const char *parse_ref_line(char *line, unsigned char *sha1) | |
14 | { | |
15 | /* | |
16 | * 42: the answer to everything. | |
17 | * | |
18 | * In this case, it happens to be the answer to | |
19 | * 40 (length of sha1 hex representation) | |
20 | * +1 (space in between hex and name) | |
21 | * +1 (newline at the end of the line) | |
22 | */ | |
23 | int len = strlen(line) - 42; | |
24 | ||
25 | if (len <= 0) | |
26 | return NULL; | |
27 | if (get_sha1_hex(line, sha1) < 0) | |
28 | return NULL; | |
29 | if (!isspace(line[40])) | |
30 | return NULL; | |
31 | line += 41; | |
434cd0cd LT |
32 | if (isspace(*line)) |
33 | return NULL; | |
e1e22e37 LT |
34 | if (line[len] != '\n') |
35 | return NULL; | |
36 | line[len] = 0; | |
37 | return line; | |
38 | } | |
39 | ||
8da19775 JH |
40 | static struct ref_list *add_ref(const char *name, const unsigned char *sha1, |
41 | int flag, struct ref_list *list) | |
e1e22e37 LT |
42 | { |
43 | int len; | |
44 | struct ref_list **p = &list, *entry; | |
45 | ||
46 | /* Find the place to insert the ref into.. */ | |
47 | while ((entry = *p) != NULL) { | |
48 | int cmp = strcmp(entry->name, name); | |
49 | if (cmp > 0) | |
50 | break; | |
51 | ||
52 | /* Same as existing entry? */ | |
53 | if (!cmp) | |
54 | return list; | |
55 | p = &entry->next; | |
56 | } | |
57 | ||
58 | /* Allocate it and add it in.. */ | |
59 | len = strlen(name) + 1; | |
60 | entry = xmalloc(sizeof(struct ref_list) + len); | |
61 | hashcpy(entry->sha1, sha1); | |
62 | memcpy(entry->name, name, len); | |
8da19775 | 63 | entry->flag = flag; |
e1e22e37 LT |
64 | entry->next = *p; |
65 | *p = entry; | |
66 | return list; | |
67 | } | |
68 | ||
5e290ff7 JH |
69 | /* |
70 | * Future: need to be in "struct repository" | |
71 | * when doing a full libification. | |
72 | */ | |
73 | struct cached_refs { | |
74 | char did_loose; | |
75 | char did_packed; | |
76 | struct ref_list *loose; | |
77 | struct ref_list *packed; | |
78 | } cached_refs; | |
79 | ||
80 | static void free_ref_list(struct ref_list *list) | |
81 | { | |
82 | struct ref_list *next; | |
83 | for ( ; list; list = next) { | |
84 | next = list->next; | |
85 | free(list); | |
86 | } | |
87 | } | |
88 | ||
89 | static void invalidate_cached_refs(void) | |
e1e22e37 | 90 | { |
5e290ff7 JH |
91 | struct cached_refs *ca = &cached_refs; |
92 | ||
93 | if (ca->did_loose && ca->loose) | |
94 | free_ref_list(ca->loose); | |
95 | if (ca->did_packed && ca->packed) | |
96 | free_ref_list(ca->packed); | |
97 | ca->loose = ca->packed = NULL; | |
98 | ca->did_loose = ca->did_packed = 0; | |
99 | } | |
e1e22e37 | 100 | |
5e290ff7 JH |
101 | static struct ref_list *get_packed_refs(void) |
102 | { | |
103 | if (!cached_refs.did_packed) { | |
104 | struct ref_list *refs = NULL; | |
e1e22e37 LT |
105 | FILE *f = fopen(git_path("packed-refs"), "r"); |
106 | if (f) { | |
107 | struct ref_list *list = NULL; | |
108 | char refline[PATH_MAX]; | |
109 | while (fgets(refline, sizeof(refline), f)) { | |
110 | unsigned char sha1[20]; | |
111 | const char *name = parse_ref_line(refline, sha1); | |
112 | if (!name) | |
113 | continue; | |
8da19775 | 114 | list = add_ref(name, sha1, REF_ISPACKED, list); |
e1e22e37 LT |
115 | } |
116 | fclose(f); | |
117 | refs = list; | |
118 | } | |
5e290ff7 JH |
119 | cached_refs.packed = refs; |
120 | cached_refs.did_packed = 1; | |
e1e22e37 | 121 | } |
5e290ff7 | 122 | return cached_refs.packed; |
e1e22e37 LT |
123 | } |
124 | ||
125 | static struct ref_list *get_ref_dir(const char *base, struct ref_list *list) | |
126 | { | |
127 | DIR *dir = opendir(git_path("%s", base)); | |
128 | ||
129 | if (dir) { | |
130 | struct dirent *de; | |
131 | int baselen = strlen(base); | |
ed378ec7 | 132 | char *ref = xmalloc(baselen + 257); |
e1e22e37 | 133 | |
ed378ec7 | 134 | memcpy(ref, base, baselen); |
e1e22e37 | 135 | if (baselen && base[baselen-1] != '/') |
ed378ec7 | 136 | ref[baselen++] = '/'; |
e1e22e37 LT |
137 | |
138 | while ((de = readdir(dir)) != NULL) { | |
139 | unsigned char sha1[20]; | |
140 | struct stat st; | |
8da19775 | 141 | int flag; |
e1e22e37 LT |
142 | int namelen; |
143 | ||
144 | if (de->d_name[0] == '.') | |
145 | continue; | |
146 | namelen = strlen(de->d_name); | |
147 | if (namelen > 255) | |
148 | continue; | |
149 | if (has_extension(de->d_name, ".lock")) | |
150 | continue; | |
ed378ec7 LT |
151 | memcpy(ref + baselen, de->d_name, namelen+1); |
152 | if (stat(git_path("%s", ref), &st) < 0) | |
e1e22e37 LT |
153 | continue; |
154 | if (S_ISDIR(st.st_mode)) { | |
ed378ec7 | 155 | list = get_ref_dir(ref, list); |
e1e22e37 LT |
156 | continue; |
157 | } | |
8da19775 | 158 | if (!resolve_ref(ref, sha1, 1, &flag)) { |
ed378ec7 | 159 | error("%s points nowhere!", ref); |
e1e22e37 LT |
160 | continue; |
161 | } | |
8da19775 | 162 | list = add_ref(ref, sha1, flag, list); |
e1e22e37 | 163 | } |
ed378ec7 | 164 | free(ref); |
e1e22e37 LT |
165 | closedir(dir); |
166 | } | |
167 | return list; | |
168 | } | |
169 | ||
170 | static struct ref_list *get_loose_refs(void) | |
171 | { | |
5e290ff7 JH |
172 | if (!cached_refs.did_loose) { |
173 | cached_refs.loose = get_ref_dir("refs", NULL); | |
174 | cached_refs.did_loose = 1; | |
e1e22e37 | 175 | } |
5e290ff7 | 176 | return cached_refs.loose; |
e1e22e37 LT |
177 | } |
178 | ||
ca8db142 LT |
179 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
180 | #define MAXDEPTH 5 | |
181 | ||
8da19775 | 182 | const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 183 | { |
a876ed83 JH |
184 | int depth = MAXDEPTH, len; |
185 | char buffer[256]; | |
ed378ec7 | 186 | static char ref_buffer[256]; |
ca8db142 | 187 | |
8da19775 JH |
188 | if (flag) |
189 | *flag = 0; | |
190 | ||
a876ed83 | 191 | for (;;) { |
ed378ec7 | 192 | const char *path = git_path("%s", ref); |
a876ed83 JH |
193 | struct stat st; |
194 | char *buf; | |
195 | int fd; | |
8a65ff76 | 196 | |
a876ed83 JH |
197 | if (--depth < 0) |
198 | return NULL; | |
ca8db142 | 199 | |
a876ed83 JH |
200 | /* Special case: non-existing file. |
201 | * Not having the refs/heads/new-branch is OK | |
202 | * if we are writing into it, so is .git/HEAD | |
203 | * that points at refs/heads/master still to be | |
204 | * born. It is NOT OK if we are resolving for | |
205 | * reading. | |
206 | */ | |
207 | if (lstat(path, &st) < 0) { | |
434cd0cd LT |
208 | struct ref_list *list = get_packed_refs(); |
209 | while (list) { | |
210 | if (!strcmp(ref, list->name)) { | |
211 | hashcpy(sha1, list->sha1); | |
8da19775 JH |
212 | if (flag) |
213 | *flag |= REF_ISPACKED; | |
434cd0cd LT |
214 | return ref; |
215 | } | |
216 | list = list->next; | |
217 | } | |
a876ed83 JH |
218 | if (reading || errno != ENOENT) |
219 | return NULL; | |
e702496e | 220 | hashclr(sha1); |
ed378ec7 | 221 | return ref; |
a876ed83 | 222 | } |
ca8db142 | 223 | |
a876ed83 JH |
224 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
225 | if (S_ISLNK(st.st_mode)) { | |
226 | len = readlink(path, buffer, sizeof(buffer)-1); | |
227 | if (len >= 5 && !memcmp("refs/", buffer, 5)) { | |
ed378ec7 LT |
228 | buffer[len] = 0; |
229 | strcpy(ref_buffer, buffer); | |
230 | ref = ref_buffer; | |
8da19775 JH |
231 | if (flag) |
232 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
233 | continue; |
234 | } | |
ca8db142 | 235 | } |
a876ed83 JH |
236 | |
237 | /* | |
238 | * Anything else, just open it and try to use it as | |
239 | * a ref | |
240 | */ | |
241 | fd = open(path, O_RDONLY); | |
242 | if (fd < 0) | |
243 | return NULL; | |
244 | len = read(fd, buffer, sizeof(buffer)-1); | |
245 | close(fd); | |
246 | ||
247 | /* | |
248 | * Is it a symbolic ref? | |
249 | */ | |
250 | if (len < 4 || memcmp("ref:", buffer, 4)) | |
251 | break; | |
252 | buf = buffer + 4; | |
253 | len -= 4; | |
254 | while (len && isspace(*buf)) | |
255 | buf++, len--; | |
256 | while (len && isspace(buf[len-1])) | |
ed378ec7 LT |
257 | len--; |
258 | buf[len] = 0; | |
259 | memcpy(ref_buffer, buf, len + 1); | |
260 | ref = ref_buffer; | |
8da19775 JH |
261 | if (flag) |
262 | *flag |= REF_ISSYMREF; | |
8a65ff76 | 263 | } |
a876ed83 JH |
264 | if (len < 40 || get_sha1_hex(buffer, sha1)) |
265 | return NULL; | |
ed378ec7 | 266 | return ref; |
a876ed83 JH |
267 | } |
268 | ||
ed378ec7 | 269 | int create_symref(const char *ref_target, const char *refs_heads_master) |
8098a178 | 270 | { |
8098a178 JH |
271 | const char *lockpath; |
272 | char ref[1000]; | |
273 | int fd, len, written; | |
ed378ec7 | 274 | const char *git_HEAD = git_path("%s", ref_target); |
8098a178 | 275 | |
9f0bb90d JH |
276 | #ifndef NO_SYMLINK_HEAD |
277 | if (prefer_symlink_refs) { | |
f8348be3 JS |
278 | unlink(git_HEAD); |
279 | if (!symlink(refs_heads_master, git_HEAD)) | |
280 | return 0; | |
281 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); | |
282 | } | |
303958dc JS |
283 | #endif |
284 | ||
8098a178 JH |
285 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); |
286 | if (sizeof(ref) <= len) { | |
287 | error("refname too long: %s", refs_heads_master); | |
288 | return -1; | |
289 | } | |
290 | lockpath = mkpath("%s.lock", git_HEAD); | |
291 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
292 | written = write(fd, ref, len); | |
293 | close(fd); | |
294 | if (written != len) { | |
295 | unlink(lockpath); | |
296 | error("Unable to write to %s", lockpath); | |
297 | return -2; | |
298 | } | |
299 | if (rename(lockpath, git_HEAD) < 0) { | |
300 | unlink(lockpath); | |
301 | error("Unable to create %s", git_HEAD); | |
302 | return -3; | |
303 | } | |
138086a7 JH |
304 | if (adjust_shared_perm(git_HEAD)) { |
305 | unlink(lockpath); | |
306 | error("Unable to fix permissions on %s", lockpath); | |
307 | return -4; | |
308 | } | |
8098a178 | 309 | return 0; |
8098a178 JH |
310 | } |
311 | ||
ed378ec7 | 312 | int read_ref(const char *ref, unsigned char *sha1) |
a876ed83 | 313 | { |
8da19775 | 314 | if (resolve_ref(ref, sha1, 1, NULL)) |
a876ed83 JH |
315 | return 0; |
316 | return -1; | |
8a65ff76 LT |
317 | } |
318 | ||
8da19775 JH |
319 | static int do_for_each_ref(const char *base, each_ref_fn fn, int trim, |
320 | void *cb_data) | |
8a65ff76 | 321 | { |
e1e22e37 LT |
322 | int retval; |
323 | struct ref_list *packed = get_packed_refs(); | |
324 | struct ref_list *loose = get_loose_refs(); | |
8a65ff76 | 325 | |
e1e22e37 LT |
326 | while (packed && loose) { |
327 | struct ref_list *entry; | |
328 | int cmp = strcmp(packed->name, loose->name); | |
329 | if (!cmp) { | |
330 | packed = packed->next; | |
331 | continue; | |
6cada6a9 | 332 | } |
e1e22e37 LT |
333 | if (cmp > 0) { |
334 | entry = loose; | |
335 | loose = loose->next; | |
336 | } else { | |
337 | entry = packed; | |
338 | packed = packed->next; | |
339 | } | |
340 | if (strncmp(base, entry->name, trim)) | |
341 | continue; | |
b37a562a LT |
342 | if (is_null_sha1(entry->sha1)) |
343 | continue; | |
344 | if (!has_sha1_file(entry->sha1)) { | |
345 | error("%s does not point to a valid object!", entry->name); | |
346 | continue; | |
347 | } | |
8da19775 JH |
348 | retval = fn(entry->name + trim, entry->sha1, |
349 | entry->flag, cb_data); | |
e1e22e37 LT |
350 | if (retval) |
351 | return retval; | |
352 | } | |
8a65ff76 | 353 | |
e1e22e37 LT |
354 | packed = packed ? packed : loose; |
355 | while (packed) { | |
356 | if (!strncmp(base, packed->name, trim)) { | |
8da19775 JH |
357 | retval = fn(packed->name + trim, packed->sha1, |
358 | packed->flag, cb_data); | |
8a65ff76 | 359 | if (retval) |
e1e22e37 | 360 | return retval; |
8a65ff76 | 361 | } |
e1e22e37 | 362 | packed = packed->next; |
8a65ff76 | 363 | } |
e1e22e37 | 364 | return 0; |
8a65ff76 LT |
365 | } |
366 | ||
cb5d709f | 367 | int head_ref(each_ref_fn fn, void *cb_data) |
723c31fe LT |
368 | { |
369 | unsigned char sha1[20]; | |
8da19775 JH |
370 | int flag; |
371 | ||
372 | if (resolve_ref("HEAD", sha1, 1, &flag)) | |
373 | return fn("HEAD", sha1, flag, cb_data); | |
2f34ba32 | 374 | return 0; |
723c31fe LT |
375 | } |
376 | ||
cb5d709f | 377 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 378 | { |
cb5d709f | 379 | return do_for_each_ref("refs/", fn, 0, cb_data); |
a62be77f SE |
380 | } |
381 | ||
cb5d709f | 382 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 383 | { |
cb5d709f | 384 | return do_for_each_ref("refs/tags/", fn, 10, cb_data); |
a62be77f SE |
385 | } |
386 | ||
cb5d709f | 387 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 388 | { |
cb5d709f | 389 | return do_for_each_ref("refs/heads/", fn, 11, cb_data); |
a62be77f SE |
390 | } |
391 | ||
cb5d709f | 392 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 393 | { |
cb5d709f | 394 | return do_for_each_ref("refs/remotes/", fn, 13, cb_data); |
8a65ff76 LT |
395 | } |
396 | ||
cb5d709f JH |
397 | /* NEEDSWORK: This is only used by ssh-upload and it should go; the |
398 | * caller should do resolve_ref or read_ref like everybody else. Or | |
399 | * maybe everybody else should use get_ref_sha1() instead of doing | |
400 | * read_ref(). | |
401 | */ | |
95fc7512 DB |
402 | int get_ref_sha1(const char *ref, unsigned char *sha1) |
403 | { | |
95fc7512 DB |
404 | if (check_ref_format(ref)) |
405 | return -1; | |
ed378ec7 | 406 | return read_ref(mkpath("refs/%s", ref), sha1); |
95fc7512 DB |
407 | } |
408 | ||
ac5409e4 JH |
409 | int delete_ref(const char *refname, unsigned char *sha1) |
410 | { | |
411 | struct ref_lock *lock; | |
412 | int err, i, ret = 0; | |
413 | ||
414 | lock = lock_any_ref_for_update(refname, sha1); | |
415 | if (!lock) | |
416 | return 1; | |
417 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
418 | lock->lk->filename[i] = 0; | |
419 | err = unlink(lock->lk->filename); | |
420 | if (err) { | |
421 | ret = 1; | |
422 | error("unlink(%s) failed: %s", | |
423 | lock->lk->filename, strerror(errno)); | |
424 | } | |
425 | lock->lk->filename[i] = '.'; | |
426 | ||
427 | err = unlink(lock->log_file); | |
428 | if (err && errno != ENOENT) | |
429 | fprintf(stderr, "warning: unlink(%s) failed: %s", | |
430 | lock->log_file, strerror(errno)); | |
431 | ||
5e290ff7 | 432 | invalidate_cached_refs(); |
ac5409e4 JH |
433 | return ret; |
434 | } | |
435 | ||
03feddd6 JH |
436 | /* |
437 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
438 | * We do not like it if: | |
439 | * | |
440 | * - any path component of it begins with ".", or | |
441 | * - it has double dots "..", or | |
442 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
443 | * - it ends with a "/". | |
444 | */ | |
445 | ||
446 | static inline int bad_ref_char(int ch) | |
447 | { | |
448 | return (((unsigned) ch) <= ' ' || | |
68283999 JH |
449 | ch == '~' || ch == '^' || ch == ':' || |
450 | /* 2.13 Pattern Matching Notation */ | |
451 | ch == '?' || ch == '*' || ch == '['); | |
03feddd6 JH |
452 | } |
453 | ||
95fc7512 DB |
454 | int check_ref_format(const char *ref) |
455 | { | |
03feddd6 JH |
456 | int ch, level; |
457 | const char *cp = ref; | |
458 | ||
459 | level = 0; | |
460 | while (1) { | |
461 | while ((ch = *cp++) == '/') | |
462 | ; /* tolerate duplicated slashes */ | |
463 | if (!ch) | |
464 | return -1; /* should not end with slashes */ | |
465 | ||
466 | /* we are at the beginning of the path component */ | |
467 | if (ch == '.' || bad_ref_char(ch)) | |
468 | return -1; | |
469 | ||
470 | /* scan the rest of the path component */ | |
471 | while ((ch = *cp++) != 0) { | |
472 | if (bad_ref_char(ch)) | |
473 | return -1; | |
474 | if (ch == '/') | |
475 | break; | |
476 | if (ch == '.' && *cp == '.') | |
477 | return -1; | |
478 | } | |
479 | level++; | |
480 | if (!ch) { | |
481 | if (level < 2) | |
482 | return -1; /* at least of form "heads/blah" */ | |
483 | return 0; | |
484 | } | |
485 | } | |
95fc7512 DB |
486 | } |
487 | ||
e5f38ec3 | 488 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
489 | const unsigned char *old_sha1, int mustexist) |
490 | { | |
8da19775 | 491 | if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 492 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
493 | unlock_ref(lock); |
494 | return NULL; | |
495 | } | |
a89fccd2 | 496 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 497 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
498 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
499 | unlock_ref(lock); | |
500 | return NULL; | |
501 | } | |
502 | return lock; | |
503 | } | |
504 | ||
bc7127ef JH |
505 | static int remove_empty_dir_recursive(char *path, int len) |
506 | { | |
507 | DIR *dir = opendir(path); | |
508 | struct dirent *e; | |
509 | int ret = 0; | |
510 | ||
511 | if (!dir) | |
512 | return -1; | |
513 | if (path[len-1] != '/') | |
514 | path[len++] = '/'; | |
515 | while ((e = readdir(dir)) != NULL) { | |
516 | struct stat st; | |
517 | int namlen; | |
518 | if ((e->d_name[0] == '.') && | |
519 | ((e->d_name[1] == 0) || | |
520 | ((e->d_name[1] == '.') && e->d_name[2] == 0))) | |
521 | continue; /* "." and ".." */ | |
522 | ||
523 | namlen = strlen(e->d_name); | |
524 | if ((len + namlen < PATH_MAX) && | |
525 | strcpy(path + len, e->d_name) && | |
526 | !lstat(path, &st) && | |
527 | S_ISDIR(st.st_mode) && | |
528 | remove_empty_dir_recursive(path, len + namlen)) | |
529 | continue; /* happy */ | |
530 | ||
531 | /* path too long, stat fails, or non-directory still exists */ | |
532 | ret = -1; | |
533 | break; | |
534 | } | |
535 | closedir(dir); | |
536 | if (!ret) { | |
537 | path[len] = 0; | |
538 | ret = rmdir(path); | |
539 | } | |
540 | return ret; | |
541 | } | |
542 | ||
543 | static int remove_empty_directories(char *file) | |
544 | { | |
545 | /* we want to create a file but there is a directory there; | |
546 | * if that is an empty directory (or a directory that contains | |
547 | * only empty directories), remove them. | |
548 | */ | |
549 | char path[PATH_MAX]; | |
550 | int len = strlen(file); | |
551 | ||
552 | if (len >= PATH_MAX) /* path too long ;-) */ | |
553 | return -1; | |
554 | strcpy(path, file); | |
555 | return remove_empty_dir_recursive(path, len); | |
556 | } | |
557 | ||
4431fcc4 | 558 | static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1) |
4bd18c43 | 559 | { |
434cd0cd | 560 | char *ref_file; |
ed378ec7 | 561 | const char *orig_ref = ref; |
4bd18c43 | 562 | struct ref_lock *lock; |
732232a1 | 563 | struct stat st; |
5cc3cef9 | 564 | int last_errno = 0; |
4431fcc4 | 565 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
4bd18c43 SP |
566 | |
567 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
568 | lock->lock_fd = -1; | |
569 | ||
8da19775 | 570 | ref = resolve_ref(ref, lock->old_sha1, mustexist, NULL); |
bc7127ef JH |
571 | if (!ref && errno == EISDIR) { |
572 | /* we are trying to lock foo but we used to | |
573 | * have foo/bar which now does not exist; | |
574 | * it is normal for the empty directory 'foo' | |
575 | * to remain. | |
576 | */ | |
577 | ref_file = git_path("%s", orig_ref); | |
5cc3cef9 JH |
578 | if (remove_empty_directories(ref_file)) { |
579 | last_errno = errno; | |
580 | error("there are still refs under '%s'", orig_ref); | |
581 | goto error_return; | |
582 | } | |
bc7127ef JH |
583 | ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, NULL); |
584 | } | |
ed378ec7 | 585 | if (!ref) { |
5cc3cef9 | 586 | last_errno = errno; |
818f477c | 587 | error("unable to resolve reference %s: %s", |
ed378ec7 | 588 | orig_ref, strerror(errno)); |
5cc3cef9 | 589 | goto error_return; |
4bd18c43 | 590 | } |
22a3844e JH |
591 | if (is_null_sha1(lock->old_sha1)) { |
592 | /* The ref did not exist and we are creating it. | |
593 | * Make sure there is no existing ref that is packed | |
594 | * whose name begins with our refname, nor a ref whose | |
595 | * name is a proper prefix of our refname. | |
596 | */ | |
597 | int namlen = strlen(ref); /* e.g. 'foo/bar' */ | |
598 | struct ref_list *list = get_packed_refs(); | |
599 | while (list) { | |
600 | /* list->name could be 'foo' or 'foo/bar/baz' */ | |
601 | int len = strlen(list->name); | |
602 | int cmplen = (namlen < len) ? namlen : len; | |
603 | const char *lead = (namlen < len) ? list->name : ref; | |
604 | ||
605 | if (!strncmp(ref, list->name, cmplen) && | |
606 | lead[cmplen] == '/') { | |
607 | error("'%s' exists; cannot create '%s'", | |
608 | list->name, ref); | |
609 | goto error_return; | |
610 | } | |
611 | list = list->next; | |
612 | } | |
613 | } | |
614 | ||
c33d5174 | 615 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 616 | |
434cd0cd | 617 | lock->ref_name = xstrdup(ref); |
ed378ec7 | 618 | lock->log_file = xstrdup(git_path("logs/%s", ref)); |
7c1a278d | 619 | ref_file = git_path("%s", ref); |
434cd0cd | 620 | lock->force_write = lstat(ref_file, &st) && errno == ENOENT; |
4bd18c43 | 621 | |
5cc3cef9 JH |
622 | if (safe_create_leading_directories(ref_file)) { |
623 | last_errno = errno; | |
624 | error("unable to create directory for %s", ref_file); | |
625 | goto error_return; | |
626 | } | |
434cd0cd | 627 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, 1); |
4bd18c43 SP |
628 | |
629 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; | |
5cc3cef9 JH |
630 | |
631 | error_return: | |
632 | unlock_ref(lock); | |
633 | errno = last_errno; | |
634 | return NULL; | |
4bd18c43 SP |
635 | } |
636 | ||
4431fcc4 | 637 | struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1) |
95fc7512 | 638 | { |
53cce84c | 639 | char refpath[PATH_MAX]; |
95fc7512 | 640 | if (check_ref_format(ref)) |
4bd18c43 | 641 | return NULL; |
53cce84c | 642 | strcpy(refpath, mkpath("refs/%s", ref)); |
4431fcc4 | 643 | return lock_ref_sha1_basic(refpath, old_sha1); |
4bd18c43 SP |
644 | } |
645 | ||
4431fcc4 | 646 | struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1) |
4bd18c43 | 647 | { |
4431fcc4 | 648 | return lock_ref_sha1_basic(ref, old_sha1); |
4bd18c43 SP |
649 | } |
650 | ||
e5f38ec3 | 651 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 SP |
652 | { |
653 | if (lock->lock_fd >= 0) { | |
654 | close(lock->lock_fd); | |
c33d5174 JH |
655 | /* Do not free lock->lk -- atexit() still looks at them */ |
656 | if (lock->lk) | |
657 | rollback_lock_file(lock->lk); | |
4bd18c43 | 658 | } |
434cd0cd | 659 | free(lock->ref_name); |
4cac42b1 | 660 | free(lock->log_file); |
4bd18c43 SP |
661 | free(lock); |
662 | } | |
663 | ||
6de08ae6 SP |
664 | static int log_ref_write(struct ref_lock *lock, |
665 | const unsigned char *sha1, const char *msg) | |
666 | { | |
667 | int logfd, written, oflags = O_APPEND | O_WRONLY; | |
668 | unsigned maxlen, len; | |
669 | char *logrec; | |
ff4c8485 | 670 | const char *committer; |
6de08ae6 SP |
671 | |
672 | if (log_all_ref_updates) { | |
673 | if (safe_create_leading_directories(lock->log_file) < 0) | |
674 | return error("unable to create directory for %s", | |
675 | lock->log_file); | |
676 | oflags |= O_CREAT; | |
677 | } | |
678 | ||
679 | logfd = open(lock->log_file, oflags, 0666); | |
680 | if (logfd < 0) { | |
681 | if (!log_all_ref_updates && errno == ENOENT) | |
682 | return 0; | |
683 | return error("Unable to append to %s: %s", | |
684 | lock->log_file, strerror(errno)); | |
685 | } | |
686 | ||
ff4c8485 | 687 | committer = git_committer_info(1); |
6de08ae6 | 688 | if (msg) { |
ff4c8485 | 689 | maxlen = strlen(committer) + strlen(msg) + 2*40 + 5; |
6de08ae6 SP |
690 | logrec = xmalloc(maxlen); |
691 | len = snprintf(logrec, maxlen, "%s %s %s\t%s\n", | |
692 | sha1_to_hex(lock->old_sha1), | |
693 | sha1_to_hex(sha1), | |
ff4c8485 | 694 | committer, |
6de08ae6 | 695 | msg); |
e5f38ec3 JH |
696 | } |
697 | else { | |
ff4c8485 | 698 | maxlen = strlen(committer) + 2*40 + 4; |
6de08ae6 SP |
699 | logrec = xmalloc(maxlen); |
700 | len = snprintf(logrec, maxlen, "%s %s %s\n", | |
701 | sha1_to_hex(lock->old_sha1), | |
702 | sha1_to_hex(sha1), | |
ff4c8485 | 703 | committer); |
6de08ae6 SP |
704 | } |
705 | written = len <= maxlen ? write(logfd, logrec, len) : -1; | |
706 | free(logrec); | |
707 | close(logfd); | |
708 | if (written != len) | |
709 | return error("Unable to append to %s", lock->log_file); | |
710 | return 0; | |
711 | } | |
712 | ||
4bd18c43 SP |
713 | int write_ref_sha1(struct ref_lock *lock, |
714 | const unsigned char *sha1, const char *logmsg) | |
715 | { | |
716 | static char term = '\n'; | |
717 | ||
718 | if (!lock) | |
95fc7512 | 719 | return -1; |
a89fccd2 | 720 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
721 | unlock_ref(lock); |
722 | return 0; | |
95fc7512 | 723 | } |
4bd18c43 SP |
724 | if (write(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
725 | write(lock->lock_fd, &term, 1) != 1 | |
726 | || close(lock->lock_fd) < 0) { | |
c33d5174 | 727 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
728 | unlock_ref(lock); |
729 | return -1; | |
730 | } | |
5e290ff7 | 731 | invalidate_cached_refs(); |
6de08ae6 SP |
732 | if (log_ref_write(lock, sha1, logmsg) < 0) { |
733 | unlock_ref(lock); | |
734 | return -1; | |
735 | } | |
c33d5174 | 736 | if (commit_lock_file(lock->lk)) { |
434cd0cd | 737 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
738 | unlock_ref(lock); |
739 | return -1; | |
740 | } | |
741 | lock->lock_fd = -1; | |
742 | unlock_ref(lock); | |
743 | return 0; | |
95fc7512 | 744 | } |
d556fae2 SP |
745 | |
746 | int read_ref_at(const char *ref, unsigned long at_time, unsigned char *sha1) | |
747 | { | |
e5229042 | 748 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 SP |
749 | char *tz_c; |
750 | int logfd, tz; | |
751 | struct stat st; | |
752 | unsigned long date; | |
e5229042 | 753 | unsigned char logged_sha1[20]; |
d556fae2 SP |
754 | |
755 | logfile = git_path("logs/%s", ref); | |
756 | logfd = open(logfile, O_RDONLY, 0); | |
757 | if (logfd < 0) | |
758 | die("Unable to read log %s: %s", logfile, strerror(errno)); | |
759 | fstat(logfd, &st); | |
760 | if (!st.st_size) | |
761 | die("Log %s is empty.", logfile); | |
762 | logdata = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, logfd, 0); | |
763 | close(logfd); | |
764 | ||
e5229042 | 765 | lastrec = NULL; |
d556fae2 SP |
766 | rec = logend = logdata + st.st_size; |
767 | while (logdata < rec) { | |
768 | if (logdata < rec && *(rec-1) == '\n') | |
769 | rec--; | |
e5229042 SP |
770 | lastgt = NULL; |
771 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 772 | rec--; |
e5229042 SP |
773 | if (*rec == '>') |
774 | lastgt = rec; | |
775 | } | |
776 | if (!lastgt) | |
d556fae2 | 777 | die("Log %s is corrupt.", logfile); |
e5229042 | 778 | date = strtoul(lastgt + 1, &tz_c, 10); |
d556fae2 | 779 | if (date <= at_time) { |
e5229042 SP |
780 | if (lastrec) { |
781 | if (get_sha1_hex(lastrec, logged_sha1)) | |
782 | die("Log %s is corrupt.", logfile); | |
783 | if (get_sha1_hex(rec + 41, sha1)) | |
784 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 785 | if (hashcmp(logged_sha1, sha1)) { |
e5229042 SP |
786 | tz = strtoul(tz_c, NULL, 10); |
787 | fprintf(stderr, | |
788 | "warning: Log %s has gap after %s.\n", | |
789 | logfile, show_rfc2822_date(date, tz)); | |
790 | } | |
e5f38ec3 JH |
791 | } |
792 | else if (date == at_time) { | |
e5229042 SP |
793 | if (get_sha1_hex(rec + 41, sha1)) |
794 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
795 | } |
796 | else { | |
e5229042 SP |
797 | if (get_sha1_hex(rec + 41, logged_sha1)) |
798 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 799 | if (hashcmp(logged_sha1, sha1)) { |
e5229042 SP |
800 | tz = strtoul(tz_c, NULL, 10); |
801 | fprintf(stderr, | |
802 | "warning: Log %s unexpectedly ended on %s.\n", | |
803 | logfile, show_rfc2822_date(date, tz)); | |
804 | } | |
805 | } | |
d556fae2 SP |
806 | munmap((void*)logdata, st.st_size); |
807 | return 0; | |
808 | } | |
e5229042 | 809 | lastrec = rec; |
d556fae2 SP |
810 | } |
811 | ||
e5229042 SP |
812 | rec = logdata; |
813 | while (rec < logend && *rec != '>' && *rec != '\n') | |
814 | rec++; | |
815 | if (rec == logend || *rec == '\n') | |
d556fae2 | 816 | die("Log %s is corrupt.", logfile); |
e5229042 | 817 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
818 | tz = strtoul(tz_c, NULL, 10); |
819 | if (get_sha1_hex(logdata, sha1)) | |
820 | die("Log %s is corrupt.", logfile); | |
821 | munmap((void*)logdata, st.st_size); | |
822 | fprintf(stderr, "warning: Log %s only goes back to %s.\n", | |
823 | logfile, show_rfc2822_date(date, tz)); | |
824 | return 0; | |
825 | } |