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Commit | Line | Data |
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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; | |
8 | unsigned char sha1[20]; | |
9 | char name[FLEX_ARRAY]; | |
10 | }; | |
11 | ||
12 | static const char *parse_ref_line(char *line, unsigned char *sha1) | |
13 | { | |
14 | /* | |
15 | * 42: the answer to everything. | |
16 | * | |
17 | * In this case, it happens to be the answer to | |
18 | * 40 (length of sha1 hex representation) | |
19 | * +1 (space in between hex and name) | |
20 | * +1 (newline at the end of the line) | |
21 | */ | |
22 | int len = strlen(line) - 42; | |
23 | ||
24 | if (len <= 0) | |
25 | return NULL; | |
26 | if (get_sha1_hex(line, sha1) < 0) | |
27 | return NULL; | |
28 | if (!isspace(line[40])) | |
29 | return NULL; | |
30 | line += 41; | |
31 | if (line[len] != '\n') | |
32 | return NULL; | |
33 | line[len] = 0; | |
34 | return line; | |
35 | } | |
36 | ||
37 | static struct ref_list *add_ref(const char *name, const unsigned char *sha1, struct ref_list *list) | |
38 | { | |
39 | int len; | |
40 | struct ref_list **p = &list, *entry; | |
41 | ||
42 | /* Find the place to insert the ref into.. */ | |
43 | while ((entry = *p) != NULL) { | |
44 | int cmp = strcmp(entry->name, name); | |
45 | if (cmp > 0) | |
46 | break; | |
47 | ||
48 | /* Same as existing entry? */ | |
49 | if (!cmp) | |
50 | return list; | |
51 | p = &entry->next; | |
52 | } | |
53 | ||
54 | /* Allocate it and add it in.. */ | |
55 | len = strlen(name) + 1; | |
56 | entry = xmalloc(sizeof(struct ref_list) + len); | |
57 | hashcpy(entry->sha1, sha1); | |
58 | memcpy(entry->name, name, len); | |
59 | entry->next = *p; | |
60 | *p = entry; | |
61 | return list; | |
62 | } | |
63 | ||
64 | static struct ref_list *get_packed_refs(void) | |
65 | { | |
66 | static int did_refs = 0; | |
67 | static struct ref_list *refs = NULL; | |
68 | ||
69 | if (!did_refs) { | |
70 | FILE *f = fopen(git_path("packed-refs"), "r"); | |
71 | if (f) { | |
72 | struct ref_list *list = NULL; | |
73 | char refline[PATH_MAX]; | |
74 | while (fgets(refline, sizeof(refline), f)) { | |
75 | unsigned char sha1[20]; | |
76 | const char *name = parse_ref_line(refline, sha1); | |
77 | if (!name) | |
78 | continue; | |
79 | list = add_ref(name, sha1, list); | |
80 | } | |
81 | fclose(f); | |
82 | refs = list; | |
83 | } | |
84 | did_refs = 1; | |
85 | } | |
86 | return refs; | |
87 | } | |
88 | ||
89 | static struct ref_list *get_ref_dir(const char *base, struct ref_list *list) | |
90 | { | |
91 | DIR *dir = opendir(git_path("%s", base)); | |
92 | ||
93 | if (dir) { | |
94 | struct dirent *de; | |
95 | int baselen = strlen(base); | |
ed378ec7 | 96 | char *ref = xmalloc(baselen + 257); |
e1e22e37 | 97 | |
ed378ec7 | 98 | memcpy(ref, base, baselen); |
e1e22e37 | 99 | if (baselen && base[baselen-1] != '/') |
ed378ec7 | 100 | ref[baselen++] = '/'; |
e1e22e37 LT |
101 | |
102 | while ((de = readdir(dir)) != NULL) { | |
103 | unsigned char sha1[20]; | |
104 | struct stat st; | |
105 | int namelen; | |
106 | ||
107 | if (de->d_name[0] == '.') | |
108 | continue; | |
109 | namelen = strlen(de->d_name); | |
110 | if (namelen > 255) | |
111 | continue; | |
112 | if (has_extension(de->d_name, ".lock")) | |
113 | continue; | |
ed378ec7 LT |
114 | memcpy(ref + baselen, de->d_name, namelen+1); |
115 | if (stat(git_path("%s", ref), &st) < 0) | |
e1e22e37 LT |
116 | continue; |
117 | if (S_ISDIR(st.st_mode)) { | |
ed378ec7 | 118 | list = get_ref_dir(ref, list); |
e1e22e37 LT |
119 | continue; |
120 | } | |
ed378ec7 LT |
121 | if (read_ref(ref, sha1) < 0) { |
122 | error("%s points nowhere!", ref); | |
e1e22e37 LT |
123 | continue; |
124 | } | |
ed378ec7 | 125 | list = add_ref(ref, sha1, list); |
e1e22e37 | 126 | } |
ed378ec7 | 127 | free(ref); |
e1e22e37 LT |
128 | closedir(dir); |
129 | } | |
130 | return list; | |
131 | } | |
132 | ||
133 | static struct ref_list *get_loose_refs(void) | |
134 | { | |
135 | static int did_refs = 0; | |
136 | static struct ref_list *refs = NULL; | |
137 | ||
138 | if (!did_refs) { | |
139 | refs = get_ref_dir("refs", NULL); | |
140 | did_refs = 1; | |
141 | } | |
142 | return refs; | |
143 | } | |
144 | ||
ca8db142 LT |
145 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
146 | #define MAXDEPTH 5 | |
147 | ||
ed378ec7 | 148 | const char *resolve_ref(const char *ref, unsigned char *sha1, int reading) |
8a65ff76 | 149 | { |
a876ed83 JH |
150 | int depth = MAXDEPTH, len; |
151 | char buffer[256]; | |
ed378ec7 | 152 | static char ref_buffer[256]; |
ca8db142 | 153 | |
a876ed83 | 154 | for (;;) { |
ed378ec7 | 155 | const char *path = git_path("%s", ref); |
a876ed83 JH |
156 | struct stat st; |
157 | char *buf; | |
158 | int fd; | |
8a65ff76 | 159 | |
a876ed83 JH |
160 | if (--depth < 0) |
161 | return NULL; | |
ca8db142 | 162 | |
a876ed83 JH |
163 | /* Special case: non-existing file. |
164 | * Not having the refs/heads/new-branch is OK | |
165 | * if we are writing into it, so is .git/HEAD | |
166 | * that points at refs/heads/master still to be | |
167 | * born. It is NOT OK if we are resolving for | |
168 | * reading. | |
169 | */ | |
170 | if (lstat(path, &st) < 0) { | |
171 | if (reading || errno != ENOENT) | |
172 | return NULL; | |
e702496e | 173 | hashclr(sha1); |
ed378ec7 | 174 | return ref; |
a876ed83 | 175 | } |
ca8db142 | 176 | |
a876ed83 JH |
177 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
178 | if (S_ISLNK(st.st_mode)) { | |
179 | len = readlink(path, buffer, sizeof(buffer)-1); | |
180 | if (len >= 5 && !memcmp("refs/", buffer, 5)) { | |
ed378ec7 LT |
181 | buffer[len] = 0; |
182 | strcpy(ref_buffer, buffer); | |
183 | ref = ref_buffer; | |
a876ed83 JH |
184 | continue; |
185 | } | |
ca8db142 | 186 | } |
a876ed83 JH |
187 | |
188 | /* | |
189 | * Anything else, just open it and try to use it as | |
190 | * a ref | |
191 | */ | |
192 | fd = open(path, O_RDONLY); | |
193 | if (fd < 0) | |
194 | return NULL; | |
195 | len = read(fd, buffer, sizeof(buffer)-1); | |
196 | close(fd); | |
197 | ||
198 | /* | |
199 | * Is it a symbolic ref? | |
200 | */ | |
201 | if (len < 4 || memcmp("ref:", buffer, 4)) | |
202 | break; | |
203 | buf = buffer + 4; | |
204 | len -= 4; | |
205 | while (len && isspace(*buf)) | |
206 | buf++, len--; | |
207 | while (len && isspace(buf[len-1])) | |
ed378ec7 LT |
208 | len--; |
209 | buf[len] = 0; | |
210 | memcpy(ref_buffer, buf, len + 1); | |
211 | ref = ref_buffer; | |
8a65ff76 | 212 | } |
a876ed83 JH |
213 | if (len < 40 || get_sha1_hex(buffer, sha1)) |
214 | return NULL; | |
ed378ec7 | 215 | return ref; |
a876ed83 JH |
216 | } |
217 | ||
ed378ec7 | 218 | int create_symref(const char *ref_target, const char *refs_heads_master) |
8098a178 | 219 | { |
8098a178 JH |
220 | const char *lockpath; |
221 | char ref[1000]; | |
222 | int fd, len, written; | |
ed378ec7 | 223 | const char *git_HEAD = git_path("%s", ref_target); |
8098a178 | 224 | |
9f0bb90d JH |
225 | #ifndef NO_SYMLINK_HEAD |
226 | if (prefer_symlink_refs) { | |
f8348be3 JS |
227 | unlink(git_HEAD); |
228 | if (!symlink(refs_heads_master, git_HEAD)) | |
229 | return 0; | |
230 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); | |
231 | } | |
303958dc JS |
232 | #endif |
233 | ||
8098a178 JH |
234 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); |
235 | if (sizeof(ref) <= len) { | |
236 | error("refname too long: %s", refs_heads_master); | |
237 | return -1; | |
238 | } | |
239 | lockpath = mkpath("%s.lock", git_HEAD); | |
240 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
241 | written = write(fd, ref, len); | |
242 | close(fd); | |
243 | if (written != len) { | |
244 | unlink(lockpath); | |
245 | error("Unable to write to %s", lockpath); | |
246 | return -2; | |
247 | } | |
248 | if (rename(lockpath, git_HEAD) < 0) { | |
249 | unlink(lockpath); | |
250 | error("Unable to create %s", git_HEAD); | |
251 | return -3; | |
252 | } | |
138086a7 JH |
253 | if (adjust_shared_perm(git_HEAD)) { |
254 | unlink(lockpath); | |
255 | error("Unable to fix permissions on %s", lockpath); | |
256 | return -4; | |
257 | } | |
8098a178 | 258 | return 0; |
8098a178 JH |
259 | } |
260 | ||
ed378ec7 | 261 | int read_ref(const char *ref, unsigned char *sha1) |
a876ed83 | 262 | { |
ed378ec7 | 263 | if (resolve_ref(ref, sha1, 1)) |
a876ed83 JH |
264 | return 0; |
265 | return -1; | |
8a65ff76 LT |
266 | } |
267 | ||
a62be77f | 268 | static int do_for_each_ref(const char *base, int (*fn)(const char *path, const unsigned char *sha1), int trim) |
8a65ff76 | 269 | { |
e1e22e37 LT |
270 | int retval; |
271 | struct ref_list *packed = get_packed_refs(); | |
272 | struct ref_list *loose = get_loose_refs(); | |
8a65ff76 | 273 | |
e1e22e37 LT |
274 | while (packed && loose) { |
275 | struct ref_list *entry; | |
276 | int cmp = strcmp(packed->name, loose->name); | |
277 | if (!cmp) { | |
278 | packed = packed->next; | |
279 | continue; | |
6cada6a9 | 280 | } |
e1e22e37 LT |
281 | if (cmp > 0) { |
282 | entry = loose; | |
283 | loose = loose->next; | |
284 | } else { | |
285 | entry = packed; | |
286 | packed = packed->next; | |
287 | } | |
288 | if (strncmp(base, entry->name, trim)) | |
289 | continue; | |
b37a562a LT |
290 | if (is_null_sha1(entry->sha1)) |
291 | continue; | |
292 | if (!has_sha1_file(entry->sha1)) { | |
293 | error("%s does not point to a valid object!", entry->name); | |
294 | continue; | |
295 | } | |
e1e22e37 LT |
296 | retval = fn(entry->name + trim, entry->sha1); |
297 | if (retval) | |
298 | return retval; | |
299 | } | |
8a65ff76 | 300 | |
e1e22e37 LT |
301 | packed = packed ? packed : loose; |
302 | while (packed) { | |
303 | if (!strncmp(base, packed->name, trim)) { | |
304 | retval = fn(packed->name + trim, packed->sha1); | |
8a65ff76 | 305 | if (retval) |
e1e22e37 | 306 | return retval; |
8a65ff76 | 307 | } |
e1e22e37 | 308 | packed = packed->next; |
8a65ff76 | 309 | } |
e1e22e37 | 310 | return 0; |
8a65ff76 LT |
311 | } |
312 | ||
723c31fe LT |
313 | int head_ref(int (*fn)(const char *path, const unsigned char *sha1)) |
314 | { | |
315 | unsigned char sha1[20]; | |
ed378ec7 | 316 | if (!read_ref("HEAD", sha1)) |
99a0a6e0 | 317 | return fn("HEAD", sha1); |
2f34ba32 | 318 | return 0; |
723c31fe LT |
319 | } |
320 | ||
944d8589 | 321 | int for_each_ref(int (*fn)(const char *path, const unsigned char *sha1)) |
8a65ff76 | 322 | { |
e1e22e37 | 323 | return do_for_each_ref("refs/", fn, 0); |
a62be77f SE |
324 | } |
325 | ||
326 | int for_each_tag_ref(int (*fn)(const char *path, const unsigned char *sha1)) | |
327 | { | |
e1e22e37 | 328 | return do_for_each_ref("refs/tags/", fn, 10); |
a62be77f SE |
329 | } |
330 | ||
331 | int for_each_branch_ref(int (*fn)(const char *path, const unsigned char *sha1)) | |
332 | { | |
e1e22e37 | 333 | return do_for_each_ref("refs/heads/", fn, 11); |
a62be77f SE |
334 | } |
335 | ||
336 | int for_each_remote_ref(int (*fn)(const char *path, const unsigned char *sha1)) | |
337 | { | |
e1e22e37 | 338 | return do_for_each_ref("refs/remotes/", fn, 13); |
8a65ff76 LT |
339 | } |
340 | ||
95fc7512 DB |
341 | int get_ref_sha1(const char *ref, unsigned char *sha1) |
342 | { | |
95fc7512 DB |
343 | if (check_ref_format(ref)) |
344 | return -1; | |
ed378ec7 | 345 | return read_ref(mkpath("refs/%s", ref), sha1); |
95fc7512 DB |
346 | } |
347 | ||
03feddd6 JH |
348 | /* |
349 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
350 | * We do not like it if: | |
351 | * | |
352 | * - any path component of it begins with ".", or | |
353 | * - it has double dots "..", or | |
354 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
355 | * - it ends with a "/". | |
356 | */ | |
357 | ||
358 | static inline int bad_ref_char(int ch) | |
359 | { | |
360 | return (((unsigned) ch) <= ' ' || | |
68283999 JH |
361 | ch == '~' || ch == '^' || ch == ':' || |
362 | /* 2.13 Pattern Matching Notation */ | |
363 | ch == '?' || ch == '*' || ch == '['); | |
03feddd6 JH |
364 | } |
365 | ||
95fc7512 DB |
366 | int check_ref_format(const char *ref) |
367 | { | |
03feddd6 JH |
368 | int ch, level; |
369 | const char *cp = ref; | |
370 | ||
371 | level = 0; | |
372 | while (1) { | |
373 | while ((ch = *cp++) == '/') | |
374 | ; /* tolerate duplicated slashes */ | |
375 | if (!ch) | |
376 | return -1; /* should not end with slashes */ | |
377 | ||
378 | /* we are at the beginning of the path component */ | |
379 | if (ch == '.' || bad_ref_char(ch)) | |
380 | return -1; | |
381 | ||
382 | /* scan the rest of the path component */ | |
383 | while ((ch = *cp++) != 0) { | |
384 | if (bad_ref_char(ch)) | |
385 | return -1; | |
386 | if (ch == '/') | |
387 | break; | |
388 | if (ch == '.' && *cp == '.') | |
389 | return -1; | |
390 | } | |
391 | level++; | |
392 | if (!ch) { | |
393 | if (level < 2) | |
394 | return -1; /* at least of form "heads/blah" */ | |
395 | return 0; | |
396 | } | |
397 | } | |
95fc7512 DB |
398 | } |
399 | ||
e5f38ec3 | 400 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
401 | const unsigned char *old_sha1, int mustexist) |
402 | { | |
403 | char buf[40]; | |
404 | int nr, fd = open(lock->ref_file, O_RDONLY); | |
405 | if (fd < 0 && (mustexist || errno != ENOENT)) { | |
406 | error("Can't verify ref %s", lock->ref_file); | |
407 | unlock_ref(lock); | |
408 | return NULL; | |
409 | } | |
410 | nr = read(fd, buf, 40); | |
411 | close(fd); | |
412 | if (nr != 40 || get_sha1_hex(buf, lock->old_sha1) < 0) { | |
413 | error("Can't verify ref %s", lock->ref_file); | |
414 | unlock_ref(lock); | |
415 | return NULL; | |
416 | } | |
a89fccd2 | 417 | if (hashcmp(lock->old_sha1, old_sha1)) { |
4bd18c43 SP |
418 | error("Ref %s is at %s but expected %s", lock->ref_file, |
419 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); | |
420 | unlock_ref(lock); | |
421 | return NULL; | |
422 | } | |
423 | return lock; | |
424 | } | |
425 | ||
ed378ec7 | 426 | static struct ref_lock *lock_ref_sha1_basic(const char *ref, |
4bd18c43 SP |
427 | int plen, |
428 | const unsigned char *old_sha1, int mustexist) | |
429 | { | |
ed378ec7 | 430 | const char *orig_ref = ref; |
4bd18c43 | 431 | struct ref_lock *lock; |
732232a1 | 432 | struct stat st; |
4bd18c43 SP |
433 | |
434 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
435 | lock->lock_fd = -1; | |
436 | ||
ed378ec7 LT |
437 | ref = resolve_ref(ref, lock->old_sha1, mustexist); |
438 | if (!ref) { | |
818f477c SP |
439 | int last_errno = errno; |
440 | error("unable to resolve reference %s: %s", | |
ed378ec7 | 441 | orig_ref, strerror(errno)); |
4bd18c43 | 442 | unlock_ref(lock); |
818f477c | 443 | errno = last_errno; |
4bd18c43 SP |
444 | return NULL; |
445 | } | |
c33d5174 | 446 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 447 | |
ed378ec7 LT |
448 | lock->ref_file = xstrdup(git_path("%s", ref)); |
449 | lock->log_file = xstrdup(git_path("logs/%s", ref)); | |
8fe92775 | 450 | lock->force_write = lstat(lock->ref_file, &st) && errno == ENOENT; |
4bd18c43 | 451 | |
c33d5174 JH |
452 | if (safe_create_leading_directories(lock->ref_file)) |
453 | die("unable to create directory for %s", lock->ref_file); | |
40aaae88 | 454 | lock->lock_fd = hold_lock_file_for_update(lock->lk, lock->ref_file, 1); |
4bd18c43 SP |
455 | |
456 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; | |
457 | } | |
458 | ||
e5f38ec3 | 459 | struct ref_lock *lock_ref_sha1(const char *ref, |
4bd18c43 | 460 | const unsigned char *old_sha1, int mustexist) |
95fc7512 | 461 | { |
95fc7512 | 462 | if (check_ref_format(ref)) |
4bd18c43 | 463 | return NULL; |
ed378ec7 | 464 | return lock_ref_sha1_basic(mkpath("refs/%s", ref), |
d0740d92 | 465 | 5 + strlen(ref), old_sha1, mustexist); |
4bd18c43 SP |
466 | } |
467 | ||
e5f38ec3 | 468 | struct ref_lock *lock_any_ref_for_update(const char *ref, |
4bd18c43 SP |
469 | const unsigned char *old_sha1, int mustexist) |
470 | { | |
ed378ec7 | 471 | return lock_ref_sha1_basic(ref, strlen(ref), old_sha1, mustexist); |
4bd18c43 SP |
472 | } |
473 | ||
e5f38ec3 | 474 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 SP |
475 | { |
476 | if (lock->lock_fd >= 0) { | |
477 | close(lock->lock_fd); | |
c33d5174 JH |
478 | /* Do not free lock->lk -- atexit() still looks at them */ |
479 | if (lock->lk) | |
480 | rollback_lock_file(lock->lk); | |
4bd18c43 | 481 | } |
4cac42b1 JH |
482 | free(lock->ref_file); |
483 | free(lock->log_file); | |
4bd18c43 SP |
484 | free(lock); |
485 | } | |
486 | ||
6de08ae6 SP |
487 | static int log_ref_write(struct ref_lock *lock, |
488 | const unsigned char *sha1, const char *msg) | |
489 | { | |
490 | int logfd, written, oflags = O_APPEND | O_WRONLY; | |
491 | unsigned maxlen, len; | |
492 | char *logrec; | |
ff4c8485 | 493 | const char *committer; |
6de08ae6 SP |
494 | |
495 | if (log_all_ref_updates) { | |
496 | if (safe_create_leading_directories(lock->log_file) < 0) | |
497 | return error("unable to create directory for %s", | |
498 | lock->log_file); | |
499 | oflags |= O_CREAT; | |
500 | } | |
501 | ||
502 | logfd = open(lock->log_file, oflags, 0666); | |
503 | if (logfd < 0) { | |
504 | if (!log_all_ref_updates && errno == ENOENT) | |
505 | return 0; | |
506 | return error("Unable to append to %s: %s", | |
507 | lock->log_file, strerror(errno)); | |
508 | } | |
509 | ||
ff4c8485 | 510 | committer = git_committer_info(1); |
6de08ae6 | 511 | if (msg) { |
ff4c8485 | 512 | maxlen = strlen(committer) + strlen(msg) + 2*40 + 5; |
6de08ae6 SP |
513 | logrec = xmalloc(maxlen); |
514 | len = snprintf(logrec, maxlen, "%s %s %s\t%s\n", | |
515 | sha1_to_hex(lock->old_sha1), | |
516 | sha1_to_hex(sha1), | |
ff4c8485 | 517 | committer, |
6de08ae6 | 518 | msg); |
e5f38ec3 JH |
519 | } |
520 | else { | |
ff4c8485 | 521 | maxlen = strlen(committer) + 2*40 + 4; |
6de08ae6 SP |
522 | logrec = xmalloc(maxlen); |
523 | len = snprintf(logrec, maxlen, "%s %s %s\n", | |
524 | sha1_to_hex(lock->old_sha1), | |
525 | sha1_to_hex(sha1), | |
ff4c8485 | 526 | committer); |
6de08ae6 SP |
527 | } |
528 | written = len <= maxlen ? write(logfd, logrec, len) : -1; | |
529 | free(logrec); | |
530 | close(logfd); | |
531 | if (written != len) | |
532 | return error("Unable to append to %s", lock->log_file); | |
533 | return 0; | |
534 | } | |
535 | ||
4bd18c43 SP |
536 | int write_ref_sha1(struct ref_lock *lock, |
537 | const unsigned char *sha1, const char *logmsg) | |
538 | { | |
539 | static char term = '\n'; | |
540 | ||
541 | if (!lock) | |
95fc7512 | 542 | return -1; |
a89fccd2 | 543 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
544 | unlock_ref(lock); |
545 | return 0; | |
95fc7512 | 546 | } |
4bd18c43 SP |
547 | if (write(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
548 | write(lock->lock_fd, &term, 1) != 1 | |
549 | || close(lock->lock_fd) < 0) { | |
c33d5174 | 550 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
551 | unlock_ref(lock); |
552 | return -1; | |
553 | } | |
6de08ae6 SP |
554 | if (log_ref_write(lock, sha1, logmsg) < 0) { |
555 | unlock_ref(lock); | |
556 | return -1; | |
557 | } | |
c33d5174 | 558 | if (commit_lock_file(lock->lk)) { |
4bd18c43 SP |
559 | error("Couldn't set %s", lock->ref_file); |
560 | unlock_ref(lock); | |
561 | return -1; | |
562 | } | |
563 | lock->lock_fd = -1; | |
564 | unlock_ref(lock); | |
565 | return 0; | |
95fc7512 | 566 | } |
d556fae2 SP |
567 | |
568 | int read_ref_at(const char *ref, unsigned long at_time, unsigned char *sha1) | |
569 | { | |
e5229042 | 570 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 SP |
571 | char *tz_c; |
572 | int logfd, tz; | |
573 | struct stat st; | |
574 | unsigned long date; | |
e5229042 | 575 | unsigned char logged_sha1[20]; |
d556fae2 SP |
576 | |
577 | logfile = git_path("logs/%s", ref); | |
578 | logfd = open(logfile, O_RDONLY, 0); | |
579 | if (logfd < 0) | |
580 | die("Unable to read log %s: %s", logfile, strerror(errno)); | |
581 | fstat(logfd, &st); | |
582 | if (!st.st_size) | |
583 | die("Log %s is empty.", logfile); | |
584 | logdata = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, logfd, 0); | |
585 | close(logfd); | |
586 | ||
e5229042 | 587 | lastrec = NULL; |
d556fae2 SP |
588 | rec = logend = logdata + st.st_size; |
589 | while (logdata < rec) { | |
590 | if (logdata < rec && *(rec-1) == '\n') | |
591 | rec--; | |
e5229042 SP |
592 | lastgt = NULL; |
593 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 594 | rec--; |
e5229042 SP |
595 | if (*rec == '>') |
596 | lastgt = rec; | |
597 | } | |
598 | if (!lastgt) | |
d556fae2 | 599 | die("Log %s is corrupt.", logfile); |
e5229042 | 600 | date = strtoul(lastgt + 1, &tz_c, 10); |
d556fae2 | 601 | if (date <= at_time) { |
e5229042 SP |
602 | if (lastrec) { |
603 | if (get_sha1_hex(lastrec, logged_sha1)) | |
604 | die("Log %s is corrupt.", logfile); | |
605 | if (get_sha1_hex(rec + 41, sha1)) | |
606 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 607 | if (hashcmp(logged_sha1, sha1)) { |
e5229042 SP |
608 | tz = strtoul(tz_c, NULL, 10); |
609 | fprintf(stderr, | |
610 | "warning: Log %s has gap after %s.\n", | |
611 | logfile, show_rfc2822_date(date, tz)); | |
612 | } | |
e5f38ec3 JH |
613 | } |
614 | else if (date == at_time) { | |
e5229042 SP |
615 | if (get_sha1_hex(rec + 41, sha1)) |
616 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
617 | } |
618 | else { | |
e5229042 SP |
619 | if (get_sha1_hex(rec + 41, logged_sha1)) |
620 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 621 | if (hashcmp(logged_sha1, sha1)) { |
e5229042 SP |
622 | tz = strtoul(tz_c, NULL, 10); |
623 | fprintf(stderr, | |
624 | "warning: Log %s unexpectedly ended on %s.\n", | |
625 | logfile, show_rfc2822_date(date, tz)); | |
626 | } | |
627 | } | |
d556fae2 SP |
628 | munmap((void*)logdata, st.st_size); |
629 | return 0; | |
630 | } | |
e5229042 | 631 | lastrec = rec; |
d556fae2 SP |
632 | } |
633 | ||
e5229042 SP |
634 | rec = logdata; |
635 | while (rec < logend && *rec != '>' && *rec != '\n') | |
636 | rec++; | |
637 | if (rec == logend || *rec == '\n') | |
d556fae2 | 638 | die("Log %s is corrupt.", logfile); |
e5229042 | 639 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
640 | tz = strtoul(tz_c, NULL, 10); |
641 | if (get_sha1_hex(logdata, sha1)) | |
642 | die("Log %s is corrupt.", logfile); | |
643 | munmap((void*)logdata, st.st_size); | |
644 | fprintf(stderr, "warning: Log %s only goes back to %s.\n", | |
645 | logfile, show_rfc2822_date(date, tz)); | |
646 | return 0; | |
647 | } |