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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; | |
50 | struct ref_list **p = &list, *entry; | |
51 | ||
52 | /* Find the place to insert the ref into.. */ | |
53 | while ((entry = *p) != NULL) { | |
54 | int cmp = strcmp(entry->name, name); | |
55 | if (cmp > 0) | |
56 | break; | |
57 | ||
58 | /* Same as existing entry? */ | |
f4204ab9 JH |
59 | if (!cmp) { |
60 | if (new_entry) | |
61 | *new_entry = entry; | |
e1e22e37 | 62 | return list; |
f4204ab9 | 63 | } |
e1e22e37 LT |
64 | p = &entry->next; |
65 | } | |
66 | ||
67 | /* Allocate it and add it in.. */ | |
68 | len = strlen(name) + 1; | |
69 | entry = xmalloc(sizeof(struct ref_list) + len); | |
70 | hashcpy(entry->sha1, sha1); | |
f4204ab9 | 71 | hashclr(entry->peeled); |
e1e22e37 | 72 | memcpy(entry->name, name, len); |
8da19775 | 73 | entry->flag = flag; |
e1e22e37 LT |
74 | entry->next = *p; |
75 | *p = entry; | |
f4204ab9 JH |
76 | if (new_entry) |
77 | *new_entry = entry; | |
e1e22e37 LT |
78 | return list; |
79 | } | |
80 | ||
5e290ff7 JH |
81 | /* |
82 | * Future: need to be in "struct repository" | |
83 | * when doing a full libification. | |
84 | */ | |
85 | struct cached_refs { | |
86 | char did_loose; | |
87 | char did_packed; | |
88 | struct ref_list *loose; | |
89 | struct ref_list *packed; | |
90 | } cached_refs; | |
91 | ||
92 | static void free_ref_list(struct ref_list *list) | |
93 | { | |
94 | struct ref_list *next; | |
95 | for ( ; list; list = next) { | |
96 | next = list->next; | |
97 | free(list); | |
98 | } | |
99 | } | |
100 | ||
101 | static void invalidate_cached_refs(void) | |
e1e22e37 | 102 | { |
5e290ff7 JH |
103 | struct cached_refs *ca = &cached_refs; |
104 | ||
105 | if (ca->did_loose && ca->loose) | |
106 | free_ref_list(ca->loose); | |
107 | if (ca->did_packed && ca->packed) | |
108 | free_ref_list(ca->packed); | |
109 | ca->loose = ca->packed = NULL; | |
110 | ca->did_loose = ca->did_packed = 0; | |
111 | } | |
e1e22e37 | 112 | |
f4204ab9 JH |
113 | static void read_packed_refs(FILE *f, struct cached_refs *cached_refs) |
114 | { | |
115 | struct ref_list *list = NULL; | |
116 | struct ref_list *last = NULL; | |
117 | char refline[PATH_MAX]; | |
118 | int flag = REF_ISPACKED; | |
119 | ||
120 | while (fgets(refline, sizeof(refline), f)) { | |
121 | unsigned char sha1[20]; | |
122 | const char *name; | |
123 | static const char header[] = "# pack-refs with:"; | |
124 | ||
125 | if (!strncmp(refline, header, sizeof(header)-1)) { | |
126 | const char *traits = refline + sizeof(header) - 1; | |
127 | if (strstr(traits, " peeled ")) | |
128 | flag |= REF_KNOWS_PEELED; | |
129 | /* perhaps other traits later as well */ | |
130 | continue; | |
131 | } | |
132 | ||
133 | name = parse_ref_line(refline, sha1); | |
134 | if (name) { | |
135 | list = add_ref(name, sha1, flag, list, &last); | |
136 | continue; | |
137 | } | |
138 | if (last && | |
139 | refline[0] == '^' && | |
140 | strlen(refline) == 42 && | |
141 | refline[41] == '\n' && | |
142 | !get_sha1_hex(refline + 1, sha1)) | |
143 | hashcpy(last->peeled, sha1); | |
144 | } | |
145 | cached_refs->packed = list; | |
146 | } | |
147 | ||
5e290ff7 JH |
148 | static struct ref_list *get_packed_refs(void) |
149 | { | |
150 | if (!cached_refs.did_packed) { | |
e1e22e37 | 151 | FILE *f = fopen(git_path("packed-refs"), "r"); |
f4204ab9 | 152 | cached_refs.packed = NULL; |
e1e22e37 | 153 | if (f) { |
f4204ab9 | 154 | read_packed_refs(f, &cached_refs); |
e1e22e37 | 155 | fclose(f); |
e1e22e37 | 156 | } |
5e290ff7 | 157 | cached_refs.did_packed = 1; |
e1e22e37 | 158 | } |
5e290ff7 | 159 | return cached_refs.packed; |
e1e22e37 LT |
160 | } |
161 | ||
162 | static struct ref_list *get_ref_dir(const char *base, struct ref_list *list) | |
163 | { | |
164 | DIR *dir = opendir(git_path("%s", base)); | |
165 | ||
166 | if (dir) { | |
167 | struct dirent *de; | |
168 | int baselen = strlen(base); | |
ed378ec7 | 169 | char *ref = xmalloc(baselen + 257); |
e1e22e37 | 170 | |
ed378ec7 | 171 | memcpy(ref, base, baselen); |
e1e22e37 | 172 | if (baselen && base[baselen-1] != '/') |
ed378ec7 | 173 | ref[baselen++] = '/'; |
e1e22e37 LT |
174 | |
175 | while ((de = readdir(dir)) != NULL) { | |
176 | unsigned char sha1[20]; | |
177 | struct stat st; | |
8da19775 | 178 | int flag; |
e1e22e37 LT |
179 | int namelen; |
180 | ||
181 | if (de->d_name[0] == '.') | |
182 | continue; | |
183 | namelen = strlen(de->d_name); | |
184 | if (namelen > 255) | |
185 | continue; | |
186 | if (has_extension(de->d_name, ".lock")) | |
187 | continue; | |
ed378ec7 LT |
188 | memcpy(ref + baselen, de->d_name, namelen+1); |
189 | if (stat(git_path("%s", ref), &st) < 0) | |
e1e22e37 LT |
190 | continue; |
191 | if (S_ISDIR(st.st_mode)) { | |
ed378ec7 | 192 | list = get_ref_dir(ref, list); |
e1e22e37 LT |
193 | continue; |
194 | } | |
8da19775 | 195 | if (!resolve_ref(ref, sha1, 1, &flag)) { |
ed378ec7 | 196 | error("%s points nowhere!", ref); |
e1e22e37 LT |
197 | continue; |
198 | } | |
f4204ab9 | 199 | list = add_ref(ref, sha1, flag, list, NULL); |
e1e22e37 | 200 | } |
ed378ec7 | 201 | free(ref); |
e1e22e37 LT |
202 | closedir(dir); |
203 | } | |
204 | return list; | |
205 | } | |
206 | ||
207 | static struct ref_list *get_loose_refs(void) | |
208 | { | |
5e290ff7 JH |
209 | if (!cached_refs.did_loose) { |
210 | cached_refs.loose = get_ref_dir("refs", NULL); | |
211 | cached_refs.did_loose = 1; | |
e1e22e37 | 212 | } |
5e290ff7 | 213 | return cached_refs.loose; |
e1e22e37 LT |
214 | } |
215 | ||
ca8db142 LT |
216 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
217 | #define MAXDEPTH 5 | |
218 | ||
8da19775 | 219 | const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 220 | { |
a876ed83 JH |
221 | int depth = MAXDEPTH, len; |
222 | char buffer[256]; | |
ed378ec7 | 223 | static char ref_buffer[256]; |
ca8db142 | 224 | |
8da19775 JH |
225 | if (flag) |
226 | *flag = 0; | |
227 | ||
a876ed83 | 228 | for (;;) { |
ed378ec7 | 229 | const char *path = git_path("%s", ref); |
a876ed83 JH |
230 | struct stat st; |
231 | char *buf; | |
232 | int fd; | |
8a65ff76 | 233 | |
a876ed83 JH |
234 | if (--depth < 0) |
235 | return NULL; | |
ca8db142 | 236 | |
a876ed83 JH |
237 | /* Special case: non-existing file. |
238 | * Not having the refs/heads/new-branch is OK | |
239 | * if we are writing into it, so is .git/HEAD | |
240 | * that points at refs/heads/master still to be | |
241 | * born. It is NOT OK if we are resolving for | |
242 | * reading. | |
243 | */ | |
244 | if (lstat(path, &st) < 0) { | |
434cd0cd LT |
245 | struct ref_list *list = get_packed_refs(); |
246 | while (list) { | |
f4204ab9 | 247 | if (!strcmp(ref, list->name)) { |
434cd0cd | 248 | hashcpy(sha1, list->sha1); |
8da19775 JH |
249 | if (flag) |
250 | *flag |= REF_ISPACKED; | |
434cd0cd LT |
251 | return ref; |
252 | } | |
253 | list = list->next; | |
254 | } | |
a876ed83 JH |
255 | if (reading || errno != ENOENT) |
256 | return NULL; | |
e702496e | 257 | hashclr(sha1); |
ed378ec7 | 258 | return ref; |
a876ed83 | 259 | } |
ca8db142 | 260 | |
a876ed83 JH |
261 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
262 | if (S_ISLNK(st.st_mode)) { | |
263 | len = readlink(path, buffer, sizeof(buffer)-1); | |
264 | if (len >= 5 && !memcmp("refs/", buffer, 5)) { | |
ed378ec7 LT |
265 | buffer[len] = 0; |
266 | strcpy(ref_buffer, buffer); | |
267 | ref = ref_buffer; | |
8da19775 JH |
268 | if (flag) |
269 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
270 | continue; |
271 | } | |
ca8db142 | 272 | } |
a876ed83 | 273 | |
7a21632f DS |
274 | /* Is it a directory? */ |
275 | if (S_ISDIR(st.st_mode)) { | |
276 | errno = EISDIR; | |
277 | return NULL; | |
278 | } | |
279 | ||
a876ed83 JH |
280 | /* |
281 | * Anything else, just open it and try to use it as | |
282 | * a ref | |
283 | */ | |
284 | fd = open(path, O_RDONLY); | |
285 | if (fd < 0) | |
286 | return NULL; | |
93d26e4c | 287 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
a876ed83 JH |
288 | close(fd); |
289 | ||
290 | /* | |
291 | * Is it a symbolic ref? | |
292 | */ | |
293 | if (len < 4 || memcmp("ref:", buffer, 4)) | |
294 | break; | |
295 | buf = buffer + 4; | |
296 | len -= 4; | |
297 | while (len && isspace(*buf)) | |
298 | buf++, len--; | |
299 | while (len && isspace(buf[len-1])) | |
ed378ec7 LT |
300 | len--; |
301 | buf[len] = 0; | |
302 | memcpy(ref_buffer, buf, len + 1); | |
303 | ref = ref_buffer; | |
8da19775 JH |
304 | if (flag) |
305 | *flag |= REF_ISSYMREF; | |
8a65ff76 | 306 | } |
a876ed83 JH |
307 | if (len < 40 || get_sha1_hex(buffer, sha1)) |
308 | return NULL; | |
ed378ec7 | 309 | return ref; |
a876ed83 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 | ||
ef06b918 JH |
319 | static int do_one_ref(const char *base, each_ref_fn fn, int trim, |
320 | void *cb_data, struct ref_list *entry) | |
321 | { | |
322 | if (strncmp(base, entry->name, trim)) | |
323 | return 0; | |
324 | if (is_null_sha1(entry->sha1)) | |
325 | return 0; | |
326 | if (!has_sha1_file(entry->sha1)) { | |
327 | error("%s does not point to a valid object!", entry->name); | |
328 | return 0; | |
329 | } | |
330 | return fn(entry->name + trim, entry->sha1, entry->flag, cb_data); | |
331 | } | |
332 | ||
cf0adba7 JH |
333 | int peel_ref(const char *ref, unsigned char *sha1) |
334 | { | |
335 | int flag; | |
336 | unsigned char base[20]; | |
337 | struct object *o; | |
338 | ||
339 | if (!resolve_ref(ref, base, 1, &flag)) | |
340 | return -1; | |
341 | ||
342 | if ((flag & REF_ISPACKED)) { | |
343 | struct ref_list *list = get_packed_refs(); | |
cf0adba7 JH |
344 | |
345 | while (list) { | |
f4204ab9 JH |
346 | if (!strcmp(list->name, ref)) { |
347 | if (list->flag & REF_KNOWS_PEELED) { | |
348 | hashcpy(sha1, list->peeled); | |
349 | return 0; | |
350 | } | |
351 | /* older pack-refs did not leave peeled ones */ | |
352 | break; | |
cf0adba7 JH |
353 | } |
354 | list = list->next; | |
355 | } | |
cf0adba7 JH |
356 | } |
357 | ||
f4204ab9 | 358 | /* fallback - callers should not call this for unpacked refs */ |
cf0adba7 JH |
359 | o = parse_object(base); |
360 | if (o->type == OBJ_TAG) { | |
361 | o = deref_tag(o, ref, 0); | |
362 | if (o) { | |
363 | hashcpy(sha1, o->sha1); | |
364 | return 0; | |
365 | } | |
366 | } | |
367 | return -1; | |
368 | } | |
369 | ||
8da19775 JH |
370 | static int do_for_each_ref(const char *base, each_ref_fn fn, int trim, |
371 | void *cb_data) | |
8a65ff76 | 372 | { |
e1e22e37 LT |
373 | int retval; |
374 | struct ref_list *packed = get_packed_refs(); | |
375 | struct ref_list *loose = get_loose_refs(); | |
8a65ff76 | 376 | |
e1e22e37 LT |
377 | while (packed && loose) { |
378 | struct ref_list *entry; | |
379 | int cmp = strcmp(packed->name, loose->name); | |
380 | if (!cmp) { | |
381 | packed = packed->next; | |
382 | continue; | |
6cada6a9 | 383 | } |
e1e22e37 LT |
384 | if (cmp > 0) { |
385 | entry = loose; | |
386 | loose = loose->next; | |
387 | } else { | |
388 | entry = packed; | |
389 | packed = packed->next; | |
390 | } | |
ef06b918 | 391 | retval = do_one_ref(base, fn, trim, cb_data, entry); |
e1e22e37 LT |
392 | if (retval) |
393 | return retval; | |
394 | } | |
8a65ff76 | 395 | |
ef06b918 JH |
396 | for (packed = packed ? packed : loose; packed; packed = packed->next) { |
397 | retval = do_one_ref(base, fn, trim, cb_data, packed); | |
398 | if (retval) | |
399 | return retval; | |
8a65ff76 | 400 | } |
e1e22e37 | 401 | return 0; |
8a65ff76 LT |
402 | } |
403 | ||
cb5d709f | 404 | int head_ref(each_ref_fn fn, void *cb_data) |
723c31fe LT |
405 | { |
406 | unsigned char sha1[20]; | |
8da19775 JH |
407 | int flag; |
408 | ||
409 | if (resolve_ref("HEAD", sha1, 1, &flag)) | |
410 | return fn("HEAD", sha1, flag, cb_data); | |
2f34ba32 | 411 | return 0; |
723c31fe LT |
412 | } |
413 | ||
cb5d709f | 414 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 415 | { |
cb5d709f | 416 | return do_for_each_ref("refs/", fn, 0, cb_data); |
a62be77f SE |
417 | } |
418 | ||
cb5d709f | 419 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 420 | { |
cb5d709f | 421 | return do_for_each_ref("refs/tags/", fn, 10, cb_data); |
a62be77f SE |
422 | } |
423 | ||
cb5d709f | 424 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 425 | { |
cb5d709f | 426 | return do_for_each_ref("refs/heads/", fn, 11, cb_data); |
a62be77f SE |
427 | } |
428 | ||
cb5d709f | 429 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 430 | { |
cb5d709f | 431 | return do_for_each_ref("refs/remotes/", fn, 13, cb_data); |
8a65ff76 LT |
432 | } |
433 | ||
cb5d709f JH |
434 | /* NEEDSWORK: This is only used by ssh-upload and it should go; the |
435 | * caller should do resolve_ref or read_ref like everybody else. Or | |
436 | * maybe everybody else should use get_ref_sha1() instead of doing | |
437 | * read_ref(). | |
438 | */ | |
95fc7512 DB |
439 | int get_ref_sha1(const char *ref, unsigned char *sha1) |
440 | { | |
95fc7512 DB |
441 | if (check_ref_format(ref)) |
442 | return -1; | |
ed378ec7 | 443 | return read_ref(mkpath("refs/%s", ref), sha1); |
95fc7512 DB |
444 | } |
445 | ||
03feddd6 JH |
446 | /* |
447 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
448 | * We do not like it if: | |
449 | * | |
450 | * - any path component of it begins with ".", or | |
451 | * - it has double dots "..", or | |
452 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
453 | * - it ends with a "/". | |
454 | */ | |
455 | ||
456 | static inline int bad_ref_char(int ch) | |
457 | { | |
458 | return (((unsigned) ch) <= ' ' || | |
68283999 JH |
459 | ch == '~' || ch == '^' || ch == ':' || |
460 | /* 2.13 Pattern Matching Notation */ | |
461 | ch == '?' || ch == '*' || ch == '['); | |
03feddd6 JH |
462 | } |
463 | ||
95fc7512 DB |
464 | int check_ref_format(const char *ref) |
465 | { | |
03feddd6 JH |
466 | int ch, level; |
467 | const char *cp = ref; | |
468 | ||
469 | level = 0; | |
470 | while (1) { | |
471 | while ((ch = *cp++) == '/') | |
472 | ; /* tolerate duplicated slashes */ | |
473 | if (!ch) | |
474 | return -1; /* should not end with slashes */ | |
475 | ||
476 | /* we are at the beginning of the path component */ | |
477 | if (ch == '.' || bad_ref_char(ch)) | |
478 | return -1; | |
479 | ||
480 | /* scan the rest of the path component */ | |
481 | while ((ch = *cp++) != 0) { | |
482 | if (bad_ref_char(ch)) | |
483 | return -1; | |
484 | if (ch == '/') | |
485 | break; | |
486 | if (ch == '.' && *cp == '.') | |
487 | return -1; | |
488 | } | |
489 | level++; | |
490 | if (!ch) { | |
491 | if (level < 2) | |
37adac76 | 492 | return -2; /* at least of form "heads/blah" */ |
03feddd6 JH |
493 | return 0; |
494 | } | |
495 | } | |
95fc7512 DB |
496 | } |
497 | ||
e5f38ec3 | 498 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
499 | const unsigned char *old_sha1, int mustexist) |
500 | { | |
8da19775 | 501 | if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 502 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
503 | unlock_ref(lock); |
504 | return NULL; | |
505 | } | |
a89fccd2 | 506 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 507 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
508 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
509 | unlock_ref(lock); | |
510 | return NULL; | |
511 | } | |
512 | return lock; | |
513 | } | |
514 | ||
bc7127ef JH |
515 | static int remove_empty_dir_recursive(char *path, int len) |
516 | { | |
517 | DIR *dir = opendir(path); | |
518 | struct dirent *e; | |
519 | int ret = 0; | |
520 | ||
521 | if (!dir) | |
522 | return -1; | |
523 | if (path[len-1] != '/') | |
524 | path[len++] = '/'; | |
525 | while ((e = readdir(dir)) != NULL) { | |
526 | struct stat st; | |
527 | int namlen; | |
528 | if ((e->d_name[0] == '.') && | |
529 | ((e->d_name[1] == 0) || | |
530 | ((e->d_name[1] == '.') && e->d_name[2] == 0))) | |
531 | continue; /* "." and ".." */ | |
532 | ||
533 | namlen = strlen(e->d_name); | |
534 | if ((len + namlen < PATH_MAX) && | |
535 | strcpy(path + len, e->d_name) && | |
536 | !lstat(path, &st) && | |
537 | S_ISDIR(st.st_mode) && | |
28bed6ea | 538 | !remove_empty_dir_recursive(path, len + namlen)) |
bc7127ef JH |
539 | continue; /* happy */ |
540 | ||
541 | /* path too long, stat fails, or non-directory still exists */ | |
542 | ret = -1; | |
543 | break; | |
544 | } | |
545 | closedir(dir); | |
546 | if (!ret) { | |
547 | path[len] = 0; | |
548 | ret = rmdir(path); | |
549 | } | |
550 | return ret; | |
551 | } | |
552 | ||
553 | static int remove_empty_directories(char *file) | |
554 | { | |
555 | /* we want to create a file but there is a directory there; | |
556 | * if that is an empty directory (or a directory that contains | |
557 | * only empty directories), remove them. | |
558 | */ | |
559 | char path[PATH_MAX]; | |
560 | int len = strlen(file); | |
561 | ||
562 | if (len >= PATH_MAX) /* path too long ;-) */ | |
563 | return -1; | |
564 | strcpy(path, file); | |
565 | return remove_empty_dir_recursive(path, len); | |
566 | } | |
567 | ||
c976d415 LH |
568 | static int is_refname_available(const char *ref, const char *oldref, |
569 | struct ref_list *list, int quiet) | |
570 | { | |
571 | int namlen = strlen(ref); /* e.g. 'foo/bar' */ | |
572 | while (list) { | |
573 | /* list->name could be 'foo' or 'foo/bar/baz' */ | |
574 | if (!oldref || strcmp(oldref, list->name)) { | |
575 | int len = strlen(list->name); | |
576 | int cmplen = (namlen < len) ? namlen : len; | |
577 | const char *lead = (namlen < len) ? list->name : ref; | |
578 | if (!strncmp(ref, list->name, cmplen) && | |
579 | lead[cmplen] == '/') { | |
580 | if (!quiet) | |
581 | error("'%s' exists; cannot create '%s'", | |
582 | list->name, ref); | |
583 | return 0; | |
584 | } | |
585 | } | |
586 | list = list->next; | |
587 | } | |
588 | return 1; | |
589 | } | |
590 | ||
c0277d15 | 591 | static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int *flag) |
4bd18c43 | 592 | { |
434cd0cd | 593 | char *ref_file; |
ed378ec7 | 594 | const char *orig_ref = ref; |
4bd18c43 | 595 | struct ref_lock *lock; |
732232a1 | 596 | struct stat st; |
5cc3cef9 | 597 | int last_errno = 0; |
4431fcc4 | 598 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
4bd18c43 SP |
599 | |
600 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
601 | lock->lock_fd = -1; | |
602 | ||
c0277d15 | 603 | ref = resolve_ref(ref, lock->old_sha1, mustexist, flag); |
bc7127ef JH |
604 | if (!ref && errno == EISDIR) { |
605 | /* we are trying to lock foo but we used to | |
606 | * have foo/bar which now does not exist; | |
607 | * it is normal for the empty directory 'foo' | |
608 | * to remain. | |
609 | */ | |
610 | ref_file = git_path("%s", orig_ref); | |
5cc3cef9 JH |
611 | if (remove_empty_directories(ref_file)) { |
612 | last_errno = errno; | |
613 | error("there are still refs under '%s'", orig_ref); | |
614 | goto error_return; | |
615 | } | |
c0277d15 | 616 | ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, flag); |
bc7127ef | 617 | } |
ed378ec7 | 618 | if (!ref) { |
5cc3cef9 | 619 | last_errno = errno; |
818f477c | 620 | error("unable to resolve reference %s: %s", |
ed378ec7 | 621 | orig_ref, strerror(errno)); |
5cc3cef9 | 622 | goto error_return; |
4bd18c43 | 623 | } |
c976d415 LH |
624 | /* When the ref did not exist and we are creating it, |
625 | * make sure there is no existing ref that is packed | |
626 | * whose name begins with our refname, nor a ref whose | |
627 | * name is a proper prefix of our refname. | |
628 | */ | |
629 | if (is_null_sha1(lock->old_sha1) && | |
630 | !is_refname_available(ref, NULL, get_packed_refs(), 0)) | |
631 | goto error_return; | |
22a3844e | 632 | |
c33d5174 | 633 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 634 | |
434cd0cd | 635 | lock->ref_name = xstrdup(ref); |
1655707c | 636 | lock->orig_ref_name = xstrdup(orig_ref); |
7c1a278d | 637 | ref_file = git_path("%s", ref); |
434cd0cd | 638 | lock->force_write = lstat(ref_file, &st) && errno == ENOENT; |
4bd18c43 | 639 | |
5cc3cef9 JH |
640 | if (safe_create_leading_directories(ref_file)) { |
641 | last_errno = errno; | |
642 | error("unable to create directory for %s", ref_file); | |
643 | goto error_return; | |
644 | } | |
434cd0cd | 645 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, 1); |
4bd18c43 SP |
646 | |
647 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; | |
5cc3cef9 JH |
648 | |
649 | error_return: | |
650 | unlock_ref(lock); | |
651 | errno = last_errno; | |
652 | return NULL; | |
4bd18c43 SP |
653 | } |
654 | ||
4431fcc4 | 655 | struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1) |
95fc7512 | 656 | { |
53cce84c | 657 | char refpath[PATH_MAX]; |
95fc7512 | 658 | if (check_ref_format(ref)) |
4bd18c43 | 659 | return NULL; |
53cce84c | 660 | strcpy(refpath, mkpath("refs/%s", ref)); |
c0277d15 | 661 | return lock_ref_sha1_basic(refpath, old_sha1, NULL); |
4bd18c43 SP |
662 | } |
663 | ||
4431fcc4 | 664 | struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1) |
4bd18c43 | 665 | { |
a2f9fe92 JH |
666 | if (check_ref_format(ref) == -1) |
667 | return NULL; | |
c0277d15 JH |
668 | return lock_ref_sha1_basic(ref, old_sha1, NULL); |
669 | } | |
670 | ||
26a063a1 JH |
671 | static struct lock_file packlock; |
672 | ||
c0277d15 JH |
673 | static int repack_without_ref(const char *refname) |
674 | { | |
675 | struct ref_list *list, *packed_ref_list; | |
676 | int fd; | |
677 | int found = 0; | |
c0277d15 JH |
678 | |
679 | packed_ref_list = get_packed_refs(); | |
680 | for (list = packed_ref_list; list; list = list->next) { | |
681 | if (!strcmp(refname, list->name)) { | |
682 | found = 1; | |
683 | break; | |
684 | } | |
685 | } | |
686 | if (!found) | |
687 | return 0; | |
c0277d15 JH |
688 | fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0); |
689 | if (fd < 0) | |
690 | return error("cannot delete '%s' from packed refs", refname); | |
691 | ||
692 | for (list = packed_ref_list; list; list = list->next) { | |
693 | char line[PATH_MAX + 100]; | |
694 | int len; | |
695 | ||
696 | if (!strcmp(refname, list->name)) | |
697 | continue; | |
698 | len = snprintf(line, sizeof(line), "%s %s\n", | |
699 | sha1_to_hex(list->sha1), list->name); | |
700 | /* this should not happen but just being defensive */ | |
701 | if (len > sizeof(line)) | |
702 | die("too long a refname '%s'", list->name); | |
703 | write_or_die(fd, line, len); | |
704 | } | |
705 | return commit_lock_file(&packlock); | |
706 | } | |
707 | ||
708 | int delete_ref(const char *refname, unsigned char *sha1) | |
709 | { | |
710 | struct ref_lock *lock; | |
711 | int err, i, ret = 0, flag = 0; | |
712 | ||
713 | lock = lock_ref_sha1_basic(refname, sha1, &flag); | |
714 | if (!lock) | |
715 | return 1; | |
716 | if (!(flag & REF_ISPACKED)) { | |
717 | /* loose */ | |
718 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
719 | lock->lk->filename[i] = 0; | |
720 | err = unlink(lock->lk->filename); | |
721 | if (err) { | |
722 | ret = 1; | |
723 | error("unlink(%s) failed: %s", | |
724 | lock->lk->filename, strerror(errno)); | |
725 | } | |
726 | lock->lk->filename[i] = '.'; | |
727 | } | |
728 | /* removing the loose one could have resurrected an earlier | |
729 | * packed one. Also, if it was not loose we need to repack | |
730 | * without it. | |
731 | */ | |
732 | ret |= repack_without_ref(refname); | |
733 | ||
9a13f0b7 | 734 | err = unlink(git_path("logs/%s", lock->ref_name)); |
c0277d15 JH |
735 | if (err && errno != ENOENT) |
736 | fprintf(stderr, "warning: unlink(%s) failed: %s", | |
9a13f0b7 | 737 | git_path("logs/%s", lock->ref_name), strerror(errno)); |
c0277d15 JH |
738 | invalidate_cached_refs(); |
739 | unlock_ref(lock); | |
740 | return ret; | |
4bd18c43 SP |
741 | } |
742 | ||
678d0f4c | 743 | int rename_ref(const char *oldref, const char *newref, const char *logmsg) |
c976d415 LH |
744 | { |
745 | static const char renamed_ref[] = "RENAMED-REF"; | |
746 | unsigned char sha1[20], orig_sha1[20]; | |
747 | int flag = 0, logmoved = 0; | |
748 | struct ref_lock *lock; | |
c976d415 | 749 | struct stat loginfo; |
16c2bfbb | 750 | int log = !lstat(git_path("logs/%s", oldref), &loginfo); |
c976d415 LH |
751 | |
752 | if (S_ISLNK(loginfo.st_mode)) | |
753 | return error("reflog for %s is a symlink", oldref); | |
754 | ||
755 | if (!resolve_ref(oldref, orig_sha1, 1, &flag)) | |
756 | return error("refname %s not found", oldref); | |
757 | ||
758 | if (!is_refname_available(newref, oldref, get_packed_refs(), 0)) | |
759 | return 1; | |
760 | ||
761 | if (!is_refname_available(newref, oldref, get_loose_refs(), 0)) | |
762 | return 1; | |
763 | ||
c976d415 LH |
764 | lock = lock_ref_sha1_basic(renamed_ref, NULL, NULL); |
765 | if (!lock) | |
766 | return error("unable to lock %s", renamed_ref); | |
767 | lock->force_write = 1; | |
678d0f4c | 768 | if (write_ref_sha1(lock, orig_sha1, logmsg)) |
c976d415 LH |
769 | return error("unable to save current sha1 in %s", renamed_ref); |
770 | ||
771 | if (log && rename(git_path("logs/%s", oldref), git_path("tmp-renamed-log"))) | |
772 | return error("unable to move logfile logs/%s to tmp-renamed-log: %s", | |
773 | oldref, strerror(errno)); | |
774 | ||
775 | if (delete_ref(oldref, orig_sha1)) { | |
776 | error("unable to delete old %s", oldref); | |
777 | goto rollback; | |
778 | } | |
779 | ||
780 | if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1)) { | |
781 | if (errno==EISDIR) { | |
782 | if (remove_empty_directories(git_path("%s", newref))) { | |
783 | error("Directory not empty: %s", newref); | |
784 | goto rollback; | |
785 | } | |
786 | } else { | |
787 | error("unable to delete existing %s", newref); | |
788 | goto rollback; | |
789 | } | |
790 | } | |
791 | ||
792 | if (log && safe_create_leading_directories(git_path("logs/%s", newref))) { | |
793 | error("unable to create directory for %s", newref); | |
794 | goto rollback; | |
795 | } | |
796 | ||
797 | retry: | |
798 | if (log && rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref))) { | |
d9e74d57 JR |
799 | if (errno==EISDIR || errno==ENOTDIR) { |
800 | /* | |
801 | * rename(a, b) when b is an existing | |
802 | * directory ought to result in ISDIR, but | |
803 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
804 | */ | |
c976d415 LH |
805 | if (remove_empty_directories(git_path("logs/%s", newref))) { |
806 | error("Directory not empty: logs/%s", newref); | |
807 | goto rollback; | |
808 | } | |
809 | goto retry; | |
810 | } else { | |
811 | error("unable to move logfile tmp-renamed-log to logs/%s: %s", | |
812 | newref, strerror(errno)); | |
813 | goto rollback; | |
814 | } | |
815 | } | |
816 | logmoved = log; | |
817 | ||
818 | lock = lock_ref_sha1_basic(newref, NULL, NULL); | |
819 | if (!lock) { | |
820 | error("unable to lock %s for update", newref); | |
821 | goto rollback; | |
822 | } | |
823 | ||
824 | lock->force_write = 1; | |
825 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 826 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
c976d415 LH |
827 | error("unable to write current sha1 into %s", newref); |
828 | goto rollback; | |
829 | } | |
830 | ||
cc44c765 JH |
831 | if (!prefixcmp(oldref, "refs/heads/") && |
832 | !prefixcmp(newref, "refs/heads/")) { | |
dc81c58c JS |
833 | char oldsection[1024], newsection[1024]; |
834 | ||
835 | snprintf(oldsection, 1024, "branch.%s", oldref + 11); | |
836 | snprintf(newsection, 1024, "branch.%s", newref + 11); | |
837 | if (git_config_rename_section(oldsection, newsection) < 0) | |
838 | return 1; | |
839 | } | |
840 | ||
c976d415 LH |
841 | return 0; |
842 | ||
843 | rollback: | |
844 | lock = lock_ref_sha1_basic(oldref, NULL, NULL); | |
845 | if (!lock) { | |
846 | error("unable to lock %s for rollback", oldref); | |
847 | goto rollbacklog; | |
848 | } | |
849 | ||
850 | lock->force_write = 1; | |
851 | flag = log_all_ref_updates; | |
852 | log_all_ref_updates = 0; | |
853 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
854 | error("unable to write current sha1 into %s", oldref); | |
855 | log_all_ref_updates = flag; | |
856 | ||
857 | rollbacklog: | |
858 | if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref))) | |
859 | error("unable to restore logfile %s from %s: %s", | |
860 | oldref, newref, strerror(errno)); | |
861 | if (!logmoved && log && | |
862 | rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref))) | |
863 | error("unable to restore logfile %s from tmp-renamed-log: %s", | |
864 | oldref, strerror(errno)); | |
865 | ||
866 | return 1; | |
867 | } | |
868 | ||
e5f38ec3 | 869 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 SP |
870 | { |
871 | if (lock->lock_fd >= 0) { | |
872 | close(lock->lock_fd); | |
c33d5174 JH |
873 | /* Do not free lock->lk -- atexit() still looks at them */ |
874 | if (lock->lk) | |
875 | rollback_lock_file(lock->lk); | |
4bd18c43 | 876 | } |
434cd0cd | 877 | free(lock->ref_name); |
1655707c | 878 | free(lock->orig_ref_name); |
4bd18c43 SP |
879 | free(lock); |
880 | } | |
881 | ||
9a13f0b7 NP |
882 | static int log_ref_write(const char *ref_name, const unsigned char *old_sha1, |
883 | const unsigned char *new_sha1, const char *msg) | |
6de08ae6 SP |
884 | { |
885 | int logfd, written, oflags = O_APPEND | O_WRONLY; | |
886 | unsigned maxlen, len; | |
8ac65937 | 887 | int msglen; |
9a13f0b7 | 888 | char *log_file, *logrec; |
ff4c8485 | 889 | const char *committer; |
6de08ae6 | 890 | |
510c5a8e | 891 | if (log_all_ref_updates < 0) |
7d1864ce | 892 | log_all_ref_updates = !is_bare_repository(); |
510c5a8e | 893 | |
9a13f0b7 NP |
894 | log_file = git_path("logs/%s", ref_name); |
895 | ||
4057deb5 | 896 | if (log_all_ref_updates && |
cc44c765 JH |
897 | (!prefixcmp(ref_name, "refs/heads/") || |
898 | !prefixcmp(ref_name, "refs/remotes/") || | |
bd104db1 | 899 | !strcmp(ref_name, "HEAD"))) { |
9a13f0b7 | 900 | if (safe_create_leading_directories(log_file) < 0) |
6de08ae6 | 901 | return error("unable to create directory for %s", |
9a13f0b7 | 902 | log_file); |
6de08ae6 SP |
903 | oflags |= O_CREAT; |
904 | } | |
905 | ||
9a13f0b7 | 906 | logfd = open(log_file, oflags, 0666); |
6de08ae6 | 907 | if (logfd < 0) { |
1974bf62 | 908 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 909 | return 0; |
3b463c3f JH |
910 | |
911 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
9a13f0b7 | 912 | if (remove_empty_directories(log_file)) { |
3b463c3f | 913 | return error("There are still logs under '%s'", |
9a13f0b7 | 914 | log_file); |
3b463c3f | 915 | } |
9a13f0b7 | 916 | logfd = open(log_file, oflags, 0666); |
3b463c3f JH |
917 | } |
918 | ||
919 | if (logfd < 0) | |
920 | return error("Unable to append to %s: %s", | |
9a13f0b7 | 921 | log_file, strerror(errno)); |
6de08ae6 SP |
922 | } |
923 | ||
443b92b6 MK |
924 | adjust_shared_perm(log_file); |
925 | ||
8ac65937 | 926 | msglen = 0; |
6de08ae6 | 927 | if (msg) { |
8ac65937 JH |
928 | /* clean up the message and make sure it is a single line */ |
929 | for ( ; *msg; msg++) | |
930 | if (!isspace(*msg)) | |
931 | break; | |
932 | if (*msg) { | |
933 | const char *ep = strchr(msg, '\n'); | |
934 | if (ep) | |
935 | msglen = ep - msg; | |
936 | else | |
937 | msglen = strlen(msg); | |
938 | } | |
6de08ae6 | 939 | } |
8ac65937 JH |
940 | |
941 | committer = git_committer_info(-1); | |
942 | maxlen = strlen(committer) + msglen + 100; | |
943 | logrec = xmalloc(maxlen); | |
944 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
945 | sha1_to_hex(old_sha1), |
946 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
947 | committer); |
948 | if (msglen) | |
949 | len += sprintf(logrec + len - 1, "\t%.*s\n", msglen, msg) - 1; | |
93822c22 | 950 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 SP |
951 | free(logrec); |
952 | close(logfd); | |
953 | if (written != len) | |
9a13f0b7 | 954 | return error("Unable to append to %s", log_file); |
6de08ae6 SP |
955 | return 0; |
956 | } | |
957 | ||
4bd18c43 SP |
958 | int write_ref_sha1(struct ref_lock *lock, |
959 | const unsigned char *sha1, const char *logmsg) | |
960 | { | |
961 | static char term = '\n'; | |
962 | ||
963 | if (!lock) | |
95fc7512 | 964 | return -1; |
a89fccd2 | 965 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
966 | unlock_ref(lock); |
967 | return 0; | |
95fc7512 | 968 | } |
93822c22 AW |
969 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
970 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
4bd18c43 | 971 | || close(lock->lock_fd) < 0) { |
c33d5174 | 972 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
973 | unlock_ref(lock); |
974 | return -1; | |
975 | } | |
5e290ff7 | 976 | invalidate_cached_refs(); |
bd104db1 NP |
977 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
978 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
979 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
980 | unlock_ref(lock); |
981 | return -1; | |
982 | } | |
c33d5174 | 983 | if (commit_lock_file(lock->lk)) { |
434cd0cd | 984 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
985 | unlock_ref(lock); |
986 | return -1; | |
987 | } | |
988 | lock->lock_fd = -1; | |
989 | unlock_ref(lock); | |
990 | return 0; | |
95fc7512 | 991 | } |
d556fae2 | 992 | |
8b5157e4 NP |
993 | int create_symref(const char *ref_target, const char *refs_heads_master, |
994 | const char *logmsg) | |
41b625b0 NP |
995 | { |
996 | const char *lockpath; | |
997 | char ref[1000]; | |
998 | int fd, len, written; | |
47fc52e2 | 999 | char *git_HEAD = xstrdup(git_path("%s", ref_target)); |
8b5157e4 NP |
1000 | unsigned char old_sha1[20], new_sha1[20]; |
1001 | ||
1002 | if (logmsg && read_ref(ref_target, old_sha1)) | |
1003 | hashclr(old_sha1); | |
41b625b0 | 1004 | |
d48744d1 JH |
1005 | if (safe_create_leading_directories(git_HEAD) < 0) |
1006 | return error("unable to create directory for %s", git_HEAD); | |
1007 | ||
41b625b0 NP |
1008 | #ifndef NO_SYMLINK_HEAD |
1009 | if (prefer_symlink_refs) { | |
1010 | unlink(git_HEAD); | |
1011 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 1012 | goto done; |
41b625b0 NP |
1013 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
1014 | } | |
1015 | #endif | |
1016 | ||
1017 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
1018 | if (sizeof(ref) <= len) { | |
1019 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 1020 | goto error_free_return; |
41b625b0 NP |
1021 | } |
1022 | lockpath = mkpath("%s.lock", git_HEAD); | |
1023 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
1024 | if (fd < 0) { | |
1025 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 1026 | goto error_free_return; |
41b625b0 NP |
1027 | } |
1028 | written = write_in_full(fd, ref, len); | |
1029 | close(fd); | |
1030 | if (written != len) { | |
41b625b0 | 1031 | error("Unable to write to %s", lockpath); |
47fc52e2 | 1032 | goto error_unlink_return; |
41b625b0 NP |
1033 | } |
1034 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 1035 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 1036 | goto error_unlink_return; |
41b625b0 NP |
1037 | } |
1038 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 1039 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 JH |
1040 | error_unlink_return: |
1041 | unlink(lockpath); | |
1042 | error_free_return: | |
1043 | free(git_HEAD); | |
1044 | return -1; | |
41b625b0 | 1045 | } |
8b5157e4 | 1046 | |
ee96d11b | 1047 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 1048 | done: |
ee96d11b | 1049 | #endif |
8b5157e4 NP |
1050 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
1051 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
1052 | ||
47fc52e2 | 1053 | free(git_HEAD); |
41b625b0 NP |
1054 | return 0; |
1055 | } | |
1056 | ||
16d7cc90 JH |
1057 | static char *ref_msg(const char *line, const char *endp) |
1058 | { | |
1059 | const char *ep; | |
1060 | char *msg; | |
1061 | ||
1062 | line += 82; | |
1063 | for (ep = line; ep < endp && *ep != '\n'; ep++) | |
1064 | ; | |
1065 | msg = xmalloc(ep - line + 1); | |
1066 | memcpy(msg, line, ep - line); | |
1067 | msg[ep - line] = 0; | |
1068 | return msg; | |
1069 | } | |
1070 | ||
1071 | 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 | 1072 | { |
e5229042 | 1073 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 | 1074 | char *tz_c; |
e29cb53a | 1075 | int logfd, tz, reccnt = 0; |
d556fae2 SP |
1076 | struct stat st; |
1077 | unsigned long date; | |
e5229042 | 1078 | unsigned char logged_sha1[20]; |
cb48cb58 | 1079 | void *log_mapped; |
dc49cd76 | 1080 | size_t mapsz; |
d556fae2 SP |
1081 | |
1082 | logfile = git_path("logs/%s", ref); | |
1083 | logfd = open(logfile, O_RDONLY, 0); | |
1084 | if (logfd < 0) | |
1085 | die("Unable to read log %s: %s", logfile, strerror(errno)); | |
1086 | fstat(logfd, &st); | |
1087 | if (!st.st_size) | |
1088 | die("Log %s is empty.", logfile); | |
dc49cd76 SP |
1089 | mapsz = xsize_t(st.st_size); |
1090 | log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0); | |
cb48cb58 | 1091 | logdata = log_mapped; |
d556fae2 SP |
1092 | close(logfd); |
1093 | ||
e5229042 | 1094 | lastrec = NULL; |
d556fae2 SP |
1095 | rec = logend = logdata + st.st_size; |
1096 | while (logdata < rec) { | |
e29cb53a | 1097 | reccnt++; |
d556fae2 SP |
1098 | if (logdata < rec && *(rec-1) == '\n') |
1099 | rec--; | |
e5229042 SP |
1100 | lastgt = NULL; |
1101 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 1102 | rec--; |
e5229042 SP |
1103 | if (*rec == '>') |
1104 | lastgt = rec; | |
1105 | } | |
1106 | if (!lastgt) | |
d556fae2 | 1107 | die("Log %s is corrupt.", logfile); |
e5229042 | 1108 | date = strtoul(lastgt + 1, &tz_c, 10); |
ab2a1a32 | 1109 | if (date <= at_time || cnt == 0) { |
76a44c5c | 1110 | tz = strtoul(tz_c, NULL, 10); |
16d7cc90 JH |
1111 | if (msg) |
1112 | *msg = ref_msg(rec, logend); | |
1113 | if (cutoff_time) | |
1114 | *cutoff_time = date; | |
1115 | if (cutoff_tz) | |
1116 | *cutoff_tz = tz; | |
1117 | if (cutoff_cnt) | |
76a44c5c | 1118 | *cutoff_cnt = reccnt - 1; |
e5229042 SP |
1119 | if (lastrec) { |
1120 | if (get_sha1_hex(lastrec, logged_sha1)) | |
1121 | die("Log %s is corrupt.", logfile); | |
1122 | if (get_sha1_hex(rec + 41, sha1)) | |
1123 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1124 | if (hashcmp(logged_sha1, sha1)) { |
e5229042 SP |
1125 | fprintf(stderr, |
1126 | "warning: Log %s has gap after %s.\n", | |
1127 | logfile, show_rfc2822_date(date, tz)); | |
1128 | } | |
e5f38ec3 JH |
1129 | } |
1130 | else if (date == at_time) { | |
e5229042 SP |
1131 | if (get_sha1_hex(rec + 41, sha1)) |
1132 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
1133 | } |
1134 | else { | |
e5229042 SP |
1135 | if (get_sha1_hex(rec + 41, logged_sha1)) |
1136 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1137 | if (hashcmp(logged_sha1, sha1)) { |
e5229042 SP |
1138 | fprintf(stderr, |
1139 | "warning: Log %s unexpectedly ended on %s.\n", | |
1140 | logfile, show_rfc2822_date(date, tz)); | |
1141 | } | |
1142 | } | |
dc49cd76 | 1143 | munmap(log_mapped, mapsz); |
d556fae2 SP |
1144 | return 0; |
1145 | } | |
e5229042 | 1146 | lastrec = rec; |
ab2a1a32 JH |
1147 | if (cnt > 0) |
1148 | cnt--; | |
d556fae2 SP |
1149 | } |
1150 | ||
e5229042 SP |
1151 | rec = logdata; |
1152 | while (rec < logend && *rec != '>' && *rec != '\n') | |
1153 | rec++; | |
1154 | if (rec == logend || *rec == '\n') | |
d556fae2 | 1155 | die("Log %s is corrupt.", logfile); |
e5229042 | 1156 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
1157 | tz = strtoul(tz_c, NULL, 10); |
1158 | if (get_sha1_hex(logdata, sha1)) | |
1159 | die("Log %s is corrupt.", logfile); | |
16d7cc90 JH |
1160 | if (msg) |
1161 | *msg = ref_msg(logdata, logend); | |
dc49cd76 | 1162 | munmap(log_mapped, mapsz); |
16d7cc90 JH |
1163 | |
1164 | if (cutoff_time) | |
1165 | *cutoff_time = date; | |
1166 | if (cutoff_tz) | |
1167 | *cutoff_tz = tz; | |
1168 | if (cutoff_cnt) | |
1169 | *cutoff_cnt = reccnt; | |
1170 | return 1; | |
d556fae2 | 1171 | } |
2ff81662 | 1172 | |
883d60fa | 1173 | int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data) |
2ff81662 JH |
1174 | { |
1175 | const char *logfile; | |
1176 | FILE *logfp; | |
1177 | char buf[1024]; | |
2266bf27 | 1178 | int ret = 0; |
2ff81662 JH |
1179 | |
1180 | logfile = git_path("logs/%s", ref); | |
1181 | logfp = fopen(logfile, "r"); | |
1182 | if (!logfp) | |
883d60fa | 1183 | return -1; |
2ff81662 JH |
1184 | while (fgets(buf, sizeof(buf), logfp)) { |
1185 | unsigned char osha1[20], nsha1[20]; | |
883d60fa JS |
1186 | char *email_end, *message; |
1187 | unsigned long timestamp; | |
2266bf27 | 1188 | int len, tz; |
2ff81662 JH |
1189 | |
1190 | /* old SP new SP name <email> SP time TAB msg LF */ | |
1191 | len = strlen(buf); | |
1192 | if (len < 83 || buf[len-1] != '\n' || | |
1193 | get_sha1_hex(buf, osha1) || buf[40] != ' ' || | |
883d60fa JS |
1194 | get_sha1_hex(buf + 41, nsha1) || buf[81] != ' ' || |
1195 | !(email_end = strchr(buf + 82, '>')) || | |
1196 | email_end[1] != ' ' || | |
1197 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
1198 | !message || message[0] != ' ' || | |
1199 | (message[1] != '+' && message[1] != '-') || | |
1200 | !isdigit(message[2]) || !isdigit(message[3]) || | |
b4dd4856 | 1201 | !isdigit(message[4]) || !isdigit(message[5])) |
2ff81662 | 1202 | continue; /* corrupt? */ |
883d60fa JS |
1203 | email_end[1] = '\0'; |
1204 | tz = strtol(message + 1, NULL, 10); | |
b4dd4856 JS |
1205 | if (message[6] != '\t') |
1206 | message += 6; | |
1207 | else | |
1208 | message += 7; | |
883d60fa JS |
1209 | ret = fn(osha1, nsha1, buf+82, timestamp, tz, message, cb_data); |
1210 | if (ret) | |
2266bf27 | 1211 | break; |
2ff81662 JH |
1212 | } |
1213 | fclose(logfp); | |
2266bf27 | 1214 | return ret; |
2ff81662 | 1215 | } |
e29cb53a | 1216 | |
eb8381c8 NP |
1217 | static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data) |
1218 | { | |
1219 | DIR *dir = opendir(git_path("logs/%s", base)); | |
fcee5a14 | 1220 | int retval = 0; |
eb8381c8 NP |
1221 | |
1222 | if (dir) { | |
1223 | struct dirent *de; | |
1224 | int baselen = strlen(base); | |
1225 | char *log = xmalloc(baselen + 257); | |
1226 | ||
1227 | memcpy(log, base, baselen); | |
1228 | if (baselen && base[baselen-1] != '/') | |
1229 | log[baselen++] = '/'; | |
1230 | ||
1231 | while ((de = readdir(dir)) != NULL) { | |
1232 | struct stat st; | |
1233 | int namelen; | |
1234 | ||
1235 | if (de->d_name[0] == '.') | |
1236 | continue; | |
1237 | namelen = strlen(de->d_name); | |
1238 | if (namelen > 255) | |
1239 | continue; | |
1240 | if (has_extension(de->d_name, ".lock")) | |
1241 | continue; | |
1242 | memcpy(log + baselen, de->d_name, namelen+1); | |
1243 | if (stat(git_path("logs/%s", log), &st) < 0) | |
1244 | continue; | |
1245 | if (S_ISDIR(st.st_mode)) { | |
1246 | retval = do_for_each_reflog(log, fn, cb_data); | |
1247 | } else { | |
1248 | unsigned char sha1[20]; | |
1249 | if (!resolve_ref(log, sha1, 0, NULL)) | |
1250 | retval = error("bad ref for %s", log); | |
1251 | else | |
1252 | retval = fn(log, sha1, 0, cb_data); | |
1253 | } | |
1254 | if (retval) | |
1255 | break; | |
1256 | } | |
1257 | free(log); | |
1258 | closedir(dir); | |
1259 | } | |
acb39f64 | 1260 | else if (*base) |
fcee5a14 | 1261 | return errno; |
eb8381c8 NP |
1262 | return retval; |
1263 | } | |
1264 | ||
1265 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
1266 | { | |
1267 | return do_for_each_reflog("", fn, cb_data); | |
1268 | } |