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1 | #include "cache.h" | |
2 | #include "refs.h" | |
3 | #include "object.h" | |
4 | #include "tag.h" | |
5 | #include "dir.h" | |
6 | ||
7 | /* ISSYMREF=0x01, ISPACKED=0x02 and ISBROKEN=0x04 are public interfaces */ | |
8 | #define REF_KNOWS_PEELED 0x10 | |
9 | ||
10 | struct ref_entry { | |
11 | unsigned char flag; /* ISSYMREF? ISPACKED? */ | |
12 | unsigned char sha1[20]; | |
13 | unsigned char peeled[20]; | |
14 | /* The full name of the reference (e.g., "refs/heads/master"): */ | |
15 | char name[FLEX_ARRAY]; | |
16 | }; | |
17 | ||
18 | struct ref_array { | |
19 | int nr, alloc; | |
20 | ||
21 | /* | |
22 | * Entries with index 0 <= i < sorted are sorted by name. New | |
23 | * entries are appended to the list unsorted, and are sorted | |
24 | * only when required; thus we avoid the need to sort the list | |
25 | * after the addition of every reference. | |
26 | */ | |
27 | int sorted; | |
28 | ||
29 | struct ref_entry **refs; | |
30 | }; | |
31 | ||
32 | /* | |
33 | * Parse one line from a packed-refs file. Write the SHA1 to sha1. | |
34 | * Return a pointer to the refname within the line (null-terminated), | |
35 | * or NULL if there was a problem. | |
36 | */ | |
37 | static const char *parse_ref_line(char *line, unsigned char *sha1) | |
38 | { | |
39 | /* | |
40 | * 42: the answer to everything. | |
41 | * | |
42 | * In this case, it happens to be the answer to | |
43 | * 40 (length of sha1 hex representation) | |
44 | * +1 (space in between hex and name) | |
45 | * +1 (newline at the end of the line) | |
46 | */ | |
47 | int len = strlen(line) - 42; | |
48 | ||
49 | if (len <= 0) | |
50 | return NULL; | |
51 | if (get_sha1_hex(line, sha1) < 0) | |
52 | return NULL; | |
53 | if (!isspace(line[40])) | |
54 | return NULL; | |
55 | line += 41; | |
56 | if (isspace(*line)) | |
57 | return NULL; | |
58 | if (line[len] != '\n') | |
59 | return NULL; | |
60 | line[len] = 0; | |
61 | ||
62 | return line; | |
63 | } | |
64 | ||
65 | static struct ref_entry *create_ref_entry(const char *refname, | |
66 | const unsigned char *sha1, int flag, | |
67 | int check_name) | |
68 | { | |
69 | int len; | |
70 | struct ref_entry *ref; | |
71 | ||
72 | if (check_name && | |
73 | check_refname_format(refname, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT)) | |
74 | die("Reference has invalid format: '%s'", refname); | |
75 | len = strlen(refname) + 1; | |
76 | ref = xmalloc(sizeof(struct ref_entry) + len); | |
77 | hashcpy(ref->sha1, sha1); | |
78 | hashclr(ref->peeled); | |
79 | memcpy(ref->name, refname, len); | |
80 | ref->flag = flag; | |
81 | return ref; | |
82 | } | |
83 | ||
84 | /* Add a ref_entry to the end of the ref_array (unsorted). */ | |
85 | static void add_ref(struct ref_array *refs, struct ref_entry *ref) | |
86 | { | |
87 | ALLOC_GROW(refs->refs, refs->nr + 1, refs->alloc); | |
88 | refs->refs[refs->nr++] = ref; | |
89 | } | |
90 | ||
91 | static int ref_entry_cmp(const void *a, const void *b) | |
92 | { | |
93 | struct ref_entry *one = *(struct ref_entry **)a; | |
94 | struct ref_entry *two = *(struct ref_entry **)b; | |
95 | return strcmp(one->name, two->name); | |
96 | } | |
97 | ||
98 | /* | |
99 | * Emit a warning and return true iff ref1 and ref2 have the same name | |
100 | * and the same sha1. Die if they have the same name but different | |
101 | * sha1s. | |
102 | */ | |
103 | static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2) | |
104 | { | |
105 | if (!strcmp(ref1->name, ref2->name)) { | |
106 | /* Duplicate name; make sure that the SHA1s match: */ | |
107 | if (hashcmp(ref1->sha1, ref2->sha1)) | |
108 | die("Duplicated ref, and SHA1s don't match: %s", | |
109 | ref1->name); | |
110 | warning("Duplicated ref: %s", ref1->name); | |
111 | return 1; | |
112 | } else { | |
113 | return 0; | |
114 | } | |
115 | } | |
116 | ||
117 | /* | |
118 | * Sort the entries in array (if they are not already sorted). | |
119 | */ | |
120 | static void sort_ref_array(struct ref_array *array) | |
121 | { | |
122 | int i, j; | |
123 | ||
124 | /* | |
125 | * This check also prevents passing a zero-length array to qsort(), | |
126 | * which is a problem on some platforms. | |
127 | */ | |
128 | if (array->sorted == array->nr) | |
129 | return; | |
130 | ||
131 | qsort(array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp); | |
132 | ||
133 | /* Remove any duplicates from the ref_array */ | |
134 | i = 0; | |
135 | for (j = 1; j < array->nr; j++) { | |
136 | if (is_dup_ref(array->refs[i], array->refs[j])) { | |
137 | free(array->refs[j]); | |
138 | continue; | |
139 | } | |
140 | array->refs[++i] = array->refs[j]; | |
141 | } | |
142 | array->sorted = array->nr = i + 1; | |
143 | } | |
144 | ||
145 | static struct ref_entry *search_ref_array(struct ref_array *array, const char *refname) | |
146 | { | |
147 | struct ref_entry *e, **r; | |
148 | int len; | |
149 | ||
150 | if (refname == NULL) | |
151 | return NULL; | |
152 | ||
153 | if (!array->nr) | |
154 | return NULL; | |
155 | sort_ref_array(array); | |
156 | len = strlen(refname) + 1; | |
157 | e = xmalloc(sizeof(struct ref_entry) + len); | |
158 | memcpy(e->name, refname, len); | |
159 | ||
160 | r = bsearch(&e, array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp); | |
161 | ||
162 | free(e); | |
163 | ||
164 | if (r == NULL) | |
165 | return NULL; | |
166 | ||
167 | return *r; | |
168 | } | |
169 | ||
170 | /* | |
171 | * Future: need to be in "struct repository" | |
172 | * when doing a full libification. | |
173 | */ | |
174 | static struct ref_cache { | |
175 | struct ref_cache *next; | |
176 | char did_loose; | |
177 | char did_packed; | |
178 | struct ref_array loose; | |
179 | struct ref_array packed; | |
180 | /* The submodule name, or "" for the main repo. */ | |
181 | char name[FLEX_ARRAY]; | |
182 | } *ref_cache; | |
183 | ||
184 | static struct ref_entry *current_ref; | |
185 | ||
186 | /* | |
187 | * Never call sort_ref_array() on the extra_refs, because it is | |
188 | * allowed to contain entries with duplicate names. | |
189 | */ | |
190 | static struct ref_array extra_refs; | |
191 | ||
192 | static void clear_ref_array(struct ref_array *array) | |
193 | { | |
194 | int i; | |
195 | for (i = 0; i < array->nr; i++) | |
196 | free(array->refs[i]); | |
197 | free(array->refs); | |
198 | array->sorted = array->nr = array->alloc = 0; | |
199 | array->refs = NULL; | |
200 | } | |
201 | ||
202 | static void clear_packed_ref_cache(struct ref_cache *refs) | |
203 | { | |
204 | if (refs->did_packed) | |
205 | clear_ref_array(&refs->packed); | |
206 | refs->did_packed = 0; | |
207 | } | |
208 | ||
209 | static void clear_loose_ref_cache(struct ref_cache *refs) | |
210 | { | |
211 | if (refs->did_loose) | |
212 | clear_ref_array(&refs->loose); | |
213 | refs->did_loose = 0; | |
214 | } | |
215 | ||
216 | static struct ref_cache *create_ref_cache(const char *submodule) | |
217 | { | |
218 | int len; | |
219 | struct ref_cache *refs; | |
220 | if (!submodule) | |
221 | submodule = ""; | |
222 | len = strlen(submodule) + 1; | |
223 | refs = xcalloc(1, sizeof(struct ref_cache) + len); | |
224 | memcpy(refs->name, submodule, len); | |
225 | return refs; | |
226 | } | |
227 | ||
228 | /* | |
229 | * Return a pointer to a ref_cache for the specified submodule. For | |
230 | * the main repository, use submodule==NULL. The returned structure | |
231 | * will be allocated and initialized but not necessarily populated; it | |
232 | * should not be freed. | |
233 | */ | |
234 | static struct ref_cache *get_ref_cache(const char *submodule) | |
235 | { | |
236 | struct ref_cache *refs = ref_cache; | |
237 | if (!submodule) | |
238 | submodule = ""; | |
239 | while (refs) { | |
240 | if (!strcmp(submodule, refs->name)) | |
241 | return refs; | |
242 | refs = refs->next; | |
243 | } | |
244 | ||
245 | refs = create_ref_cache(submodule); | |
246 | refs->next = ref_cache; | |
247 | ref_cache = refs; | |
248 | return refs; | |
249 | } | |
250 | ||
251 | void invalidate_ref_cache(const char *submodule) | |
252 | { | |
253 | struct ref_cache *refs = get_ref_cache(submodule); | |
254 | clear_packed_ref_cache(refs); | |
255 | clear_loose_ref_cache(refs); | |
256 | } | |
257 | ||
258 | static void read_packed_refs(FILE *f, struct ref_array *array) | |
259 | { | |
260 | struct ref_entry *last = NULL; | |
261 | char refline[PATH_MAX]; | |
262 | int flag = REF_ISPACKED; | |
263 | ||
264 | while (fgets(refline, sizeof(refline), f)) { | |
265 | unsigned char sha1[20]; | |
266 | const char *refname; | |
267 | static const char header[] = "# pack-refs with:"; | |
268 | ||
269 | if (!strncmp(refline, header, sizeof(header)-1)) { | |
270 | const char *traits = refline + sizeof(header) - 1; | |
271 | if (strstr(traits, " peeled ")) | |
272 | flag |= REF_KNOWS_PEELED; | |
273 | /* perhaps other traits later as well */ | |
274 | continue; | |
275 | } | |
276 | ||
277 | refname = parse_ref_line(refline, sha1); | |
278 | if (refname) { | |
279 | last = create_ref_entry(refname, sha1, flag, 1); | |
280 | add_ref(array, last); | |
281 | continue; | |
282 | } | |
283 | if (last && | |
284 | refline[0] == '^' && | |
285 | strlen(refline) == 42 && | |
286 | refline[41] == '\n' && | |
287 | !get_sha1_hex(refline + 1, sha1)) | |
288 | hashcpy(last->peeled, sha1); | |
289 | } | |
290 | } | |
291 | ||
292 | void add_extra_ref(const char *refname, const unsigned char *sha1, int flag) | |
293 | { | |
294 | add_ref(&extra_refs, create_ref_entry(refname, sha1, flag, 0)); | |
295 | } | |
296 | ||
297 | void clear_extra_refs(void) | |
298 | { | |
299 | clear_ref_array(&extra_refs); | |
300 | } | |
301 | ||
302 | static struct ref_array *get_packed_refs(struct ref_cache *refs) | |
303 | { | |
304 | if (!refs->did_packed) { | |
305 | const char *packed_refs_file; | |
306 | FILE *f; | |
307 | ||
308 | if (*refs->name) | |
309 | packed_refs_file = git_path_submodule(refs->name, "packed-refs"); | |
310 | else | |
311 | packed_refs_file = git_path("packed-refs"); | |
312 | f = fopen(packed_refs_file, "r"); | |
313 | if (f) { | |
314 | read_packed_refs(f, &refs->packed); | |
315 | fclose(f); | |
316 | } | |
317 | refs->did_packed = 1; | |
318 | } | |
319 | return &refs->packed; | |
320 | } | |
321 | ||
322 | void add_packed_ref(const char *refname, const unsigned char *sha1) | |
323 | { | |
324 | add_ref(get_packed_refs(get_ref_cache(NULL)), | |
325 | create_ref_entry(refname, sha1, REF_ISPACKED, 1)); | |
326 | } | |
327 | ||
328 | static void get_ref_dir(struct ref_cache *refs, const char *base, | |
329 | struct ref_array *array) | |
330 | { | |
331 | DIR *dir; | |
332 | const char *path; | |
333 | ||
334 | if (*refs->name) | |
335 | path = git_path_submodule(refs->name, "%s", base); | |
336 | else | |
337 | path = git_path("%s", base); | |
338 | ||
339 | ||
340 | dir = opendir(path); | |
341 | ||
342 | if (dir) { | |
343 | struct dirent *de; | |
344 | int baselen = strlen(base); | |
345 | char *refname = xmalloc(baselen + 257); | |
346 | ||
347 | memcpy(refname, base, baselen); | |
348 | if (baselen && base[baselen-1] != '/') | |
349 | refname[baselen++] = '/'; | |
350 | ||
351 | while ((de = readdir(dir)) != NULL) { | |
352 | unsigned char sha1[20]; | |
353 | struct stat st; | |
354 | int flag; | |
355 | int namelen; | |
356 | const char *refdir; | |
357 | ||
358 | if (de->d_name[0] == '.') | |
359 | continue; | |
360 | namelen = strlen(de->d_name); | |
361 | if (namelen > 255) | |
362 | continue; | |
363 | if (has_extension(de->d_name, ".lock")) | |
364 | continue; | |
365 | memcpy(refname + baselen, de->d_name, namelen+1); | |
366 | refdir = *refs->name | |
367 | ? git_path_submodule(refs->name, "%s", refname) | |
368 | : git_path("%s", refname); | |
369 | if (stat(refdir, &st) < 0) | |
370 | continue; | |
371 | if (S_ISDIR(st.st_mode)) { | |
372 | get_ref_dir(refs, refname, array); | |
373 | continue; | |
374 | } | |
375 | if (*refs->name) { | |
376 | hashclr(sha1); | |
377 | flag = 0; | |
378 | if (resolve_gitlink_ref(refs->name, refname, sha1) < 0) { | |
379 | hashclr(sha1); | |
380 | flag |= REF_ISBROKEN; | |
381 | } | |
382 | } else if (read_ref_full(refname, sha1, 1, &flag)) { | |
383 | hashclr(sha1); | |
384 | flag |= REF_ISBROKEN; | |
385 | } | |
386 | add_ref(array, create_ref_entry(refname, sha1, flag, 1)); | |
387 | } | |
388 | free(refname); | |
389 | closedir(dir); | |
390 | } | |
391 | } | |
392 | ||
393 | struct warn_if_dangling_data { | |
394 | FILE *fp; | |
395 | const char *refname; | |
396 | const char *msg_fmt; | |
397 | }; | |
398 | ||
399 | static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1, | |
400 | int flags, void *cb_data) | |
401 | { | |
402 | struct warn_if_dangling_data *d = cb_data; | |
403 | const char *resolves_to; | |
404 | unsigned char junk[20]; | |
405 | ||
406 | if (!(flags & REF_ISSYMREF)) | |
407 | return 0; | |
408 | ||
409 | resolves_to = resolve_ref_unsafe(refname, junk, 0, NULL); | |
410 | if (!resolves_to || strcmp(resolves_to, d->refname)) | |
411 | return 0; | |
412 | ||
413 | fprintf(d->fp, d->msg_fmt, refname); | |
414 | return 0; | |
415 | } | |
416 | ||
417 | void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname) | |
418 | { | |
419 | struct warn_if_dangling_data data; | |
420 | ||
421 | data.fp = fp; | |
422 | data.refname = refname; | |
423 | data.msg_fmt = msg_fmt; | |
424 | for_each_rawref(warn_if_dangling_symref, &data); | |
425 | } | |
426 | ||
427 | static struct ref_array *get_loose_refs(struct ref_cache *refs) | |
428 | { | |
429 | if (!refs->did_loose) { | |
430 | get_ref_dir(refs, "refs", &refs->loose); | |
431 | refs->did_loose = 1; | |
432 | } | |
433 | return &refs->loose; | |
434 | } | |
435 | ||
436 | /* We allow "recursive" symbolic refs. Only within reason, though */ | |
437 | #define MAXDEPTH 5 | |
438 | #define MAXREFLEN (1024) | |
439 | ||
440 | /* | |
441 | * Called by resolve_gitlink_ref_recursive() after it failed to read | |
442 | * from the loose refs in ref_cache refs. Find <refname> in the | |
443 | * packed-refs file for the submodule. | |
444 | */ | |
445 | static int resolve_gitlink_packed_ref(struct ref_cache *refs, | |
446 | const char *refname, unsigned char *sha1) | |
447 | { | |
448 | struct ref_entry *ref; | |
449 | struct ref_array *array = get_packed_refs(refs); | |
450 | ||
451 | ref = search_ref_array(array, refname); | |
452 | if (ref == NULL) | |
453 | return -1; | |
454 | ||
455 | memcpy(sha1, ref->sha1, 20); | |
456 | return 0; | |
457 | } | |
458 | ||
459 | static int resolve_gitlink_ref_recursive(struct ref_cache *refs, | |
460 | const char *refname, unsigned char *sha1, | |
461 | int recursion) | |
462 | { | |
463 | int fd, len; | |
464 | char buffer[128], *p; | |
465 | char *path; | |
466 | ||
467 | if (recursion > MAXDEPTH || strlen(refname) > MAXREFLEN) | |
468 | return -1; | |
469 | path = *refs->name | |
470 | ? git_path_submodule(refs->name, "%s", refname) | |
471 | : git_path("%s", refname); | |
472 | fd = open(path, O_RDONLY); | |
473 | if (fd < 0) | |
474 | return resolve_gitlink_packed_ref(refs, refname, sha1); | |
475 | ||
476 | len = read(fd, buffer, sizeof(buffer)-1); | |
477 | close(fd); | |
478 | if (len < 0) | |
479 | return -1; | |
480 | while (len && isspace(buffer[len-1])) | |
481 | len--; | |
482 | buffer[len] = 0; | |
483 | ||
484 | /* Was it a detached head or an old-fashioned symlink? */ | |
485 | if (!get_sha1_hex(buffer, sha1)) | |
486 | return 0; | |
487 | ||
488 | /* Symref? */ | |
489 | if (strncmp(buffer, "ref:", 4)) | |
490 | return -1; | |
491 | p = buffer + 4; | |
492 | while (isspace(*p)) | |
493 | p++; | |
494 | ||
495 | return resolve_gitlink_ref_recursive(refs, p, sha1, recursion+1); | |
496 | } | |
497 | ||
498 | int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1) | |
499 | { | |
500 | int len = strlen(path), retval; | |
501 | char *submodule; | |
502 | struct ref_cache *refs; | |
503 | ||
504 | while (len && path[len-1] == '/') | |
505 | len--; | |
506 | if (!len) | |
507 | return -1; | |
508 | submodule = xstrndup(path, len); | |
509 | refs = get_ref_cache(submodule); | |
510 | free(submodule); | |
511 | ||
512 | retval = resolve_gitlink_ref_recursive(refs, refname, sha1, 0); | |
513 | return retval; | |
514 | } | |
515 | ||
516 | /* | |
517 | * Try to read ref from the packed references. On success, set sha1 | |
518 | * and return 0; otherwise, return -1. | |
519 | */ | |
520 | static int get_packed_ref(const char *refname, unsigned char *sha1) | |
521 | { | |
522 | struct ref_array *packed = get_packed_refs(get_ref_cache(NULL)); | |
523 | struct ref_entry *entry = search_ref_array(packed, refname); | |
524 | if (entry) { | |
525 | hashcpy(sha1, entry->sha1); | |
526 | return 0; | |
527 | } | |
528 | return -1; | |
529 | } | |
530 | ||
531 | const char *resolve_ref_unsafe(const char *refname, unsigned char *sha1, int reading, int *flag) | |
532 | { | |
533 | int depth = MAXDEPTH; | |
534 | ssize_t len; | |
535 | char buffer[256]; | |
536 | static char refname_buffer[256]; | |
537 | ||
538 | if (flag) | |
539 | *flag = 0; | |
540 | ||
541 | if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) | |
542 | return NULL; | |
543 | ||
544 | for (;;) { | |
545 | char path[PATH_MAX]; | |
546 | struct stat st; | |
547 | char *buf; | |
548 | int fd; | |
549 | ||
550 | if (--depth < 0) | |
551 | return NULL; | |
552 | ||
553 | git_snpath(path, sizeof(path), "%s", refname); | |
554 | ||
555 | if (lstat(path, &st) < 0) { | |
556 | if (errno != ENOENT) | |
557 | return NULL; | |
558 | /* | |
559 | * The loose reference file does not exist; | |
560 | * check for a packed reference. | |
561 | */ | |
562 | if (!get_packed_ref(refname, sha1)) { | |
563 | if (flag) | |
564 | *flag |= REF_ISPACKED; | |
565 | return refname; | |
566 | } | |
567 | /* The reference is not a packed reference, either. */ | |
568 | if (reading) { | |
569 | return NULL; | |
570 | } else { | |
571 | hashclr(sha1); | |
572 | return refname; | |
573 | } | |
574 | } | |
575 | ||
576 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ | |
577 | if (S_ISLNK(st.st_mode)) { | |
578 | len = readlink(path, buffer, sizeof(buffer)-1); | |
579 | if (len < 0) | |
580 | return NULL; | |
581 | buffer[len] = 0; | |
582 | if (!prefixcmp(buffer, "refs/") && | |
583 | !check_refname_format(buffer, 0)) { | |
584 | strcpy(refname_buffer, buffer); | |
585 | refname = refname_buffer; | |
586 | if (flag) | |
587 | *flag |= REF_ISSYMREF; | |
588 | continue; | |
589 | } | |
590 | } | |
591 | ||
592 | /* Is it a directory? */ | |
593 | if (S_ISDIR(st.st_mode)) { | |
594 | errno = EISDIR; | |
595 | return NULL; | |
596 | } | |
597 | ||
598 | /* | |
599 | * Anything else, just open it and try to use it as | |
600 | * a ref | |
601 | */ | |
602 | fd = open(path, O_RDONLY); | |
603 | if (fd < 0) | |
604 | return NULL; | |
605 | len = read_in_full(fd, buffer, sizeof(buffer)-1); | |
606 | close(fd); | |
607 | if (len < 0) | |
608 | return NULL; | |
609 | while (len && isspace(buffer[len-1])) | |
610 | len--; | |
611 | buffer[len] = '\0'; | |
612 | ||
613 | /* | |
614 | * Is it a symbolic ref? | |
615 | */ | |
616 | if (prefixcmp(buffer, "ref:")) | |
617 | break; | |
618 | if (flag) | |
619 | *flag |= REF_ISSYMREF; | |
620 | buf = buffer + 4; | |
621 | while (isspace(*buf)) | |
622 | buf++; | |
623 | if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) { | |
624 | if (flag) | |
625 | *flag |= REF_ISBROKEN; | |
626 | return NULL; | |
627 | } | |
628 | refname = strcpy(refname_buffer, buf); | |
629 | } | |
630 | /* Please note that FETCH_HEAD has a second line containing other data. */ | |
631 | if (get_sha1_hex(buffer, sha1) || (buffer[40] != '\0' && !isspace(buffer[40]))) { | |
632 | if (flag) | |
633 | *flag |= REF_ISBROKEN; | |
634 | return NULL; | |
635 | } | |
636 | return refname; | |
637 | } | |
638 | ||
639 | char *resolve_refdup(const char *ref, unsigned char *sha1, int reading, int *flag) | |
640 | { | |
641 | const char *ret = resolve_ref_unsafe(ref, sha1, reading, flag); | |
642 | return ret ? xstrdup(ret) : NULL; | |
643 | } | |
644 | ||
645 | /* The argument to filter_refs */ | |
646 | struct ref_filter { | |
647 | const char *pattern; | |
648 | each_ref_fn *fn; | |
649 | void *cb_data; | |
650 | }; | |
651 | ||
652 | int read_ref_full(const char *refname, unsigned char *sha1, int reading, int *flags) | |
653 | { | |
654 | if (resolve_ref_unsafe(refname, sha1, reading, flags)) | |
655 | return 0; | |
656 | return -1; | |
657 | } | |
658 | ||
659 | int read_ref(const char *refname, unsigned char *sha1) | |
660 | { | |
661 | return read_ref_full(refname, sha1, 1, NULL); | |
662 | } | |
663 | ||
664 | #define DO_FOR_EACH_INCLUDE_BROKEN 01 | |
665 | static int do_one_ref(const char *base, each_ref_fn fn, int trim, | |
666 | int flags, void *cb_data, struct ref_entry *entry) | |
667 | { | |
668 | if (prefixcmp(entry->name, base)) | |
669 | return 0; | |
670 | ||
671 | if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) { | |
672 | if (entry->flag & REF_ISBROKEN) | |
673 | return 0; /* ignore broken refs e.g. dangling symref */ | |
674 | if (!has_sha1_file(entry->sha1)) { | |
675 | error("%s does not point to a valid object!", entry->name); | |
676 | return 0; | |
677 | } | |
678 | } | |
679 | current_ref = entry; | |
680 | return fn(entry->name + trim, entry->sha1, entry->flag, cb_data); | |
681 | } | |
682 | ||
683 | static int filter_refs(const char *refname, const unsigned char *sha1, int flags, | |
684 | void *data) | |
685 | { | |
686 | struct ref_filter *filter = (struct ref_filter *)data; | |
687 | if (fnmatch(filter->pattern, refname, 0)) | |
688 | return 0; | |
689 | return filter->fn(refname, sha1, flags, filter->cb_data); | |
690 | } | |
691 | ||
692 | int peel_ref(const char *refname, unsigned char *sha1) | |
693 | { | |
694 | int flag; | |
695 | unsigned char base[20]; | |
696 | struct object *o; | |
697 | ||
698 | if (current_ref && (current_ref->name == refname | |
699 | || !strcmp(current_ref->name, refname))) { | |
700 | if (current_ref->flag & REF_KNOWS_PEELED) { | |
701 | hashcpy(sha1, current_ref->peeled); | |
702 | return 0; | |
703 | } | |
704 | hashcpy(base, current_ref->sha1); | |
705 | goto fallback; | |
706 | } | |
707 | ||
708 | if (read_ref_full(refname, base, 1, &flag)) | |
709 | return -1; | |
710 | ||
711 | if ((flag & REF_ISPACKED)) { | |
712 | struct ref_array *array = get_packed_refs(get_ref_cache(NULL)); | |
713 | struct ref_entry *r = search_ref_array(array, refname); | |
714 | ||
715 | if (r != NULL && r->flag & REF_KNOWS_PEELED) { | |
716 | hashcpy(sha1, r->peeled); | |
717 | return 0; | |
718 | } | |
719 | } | |
720 | ||
721 | fallback: | |
722 | o = parse_object(base); | |
723 | if (o && o->type == OBJ_TAG) { | |
724 | o = deref_tag(o, refname, 0); | |
725 | if (o) { | |
726 | hashcpy(sha1, o->sha1); | |
727 | return 0; | |
728 | } | |
729 | } | |
730 | return -1; | |
731 | } | |
732 | ||
733 | static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn, | |
734 | int trim, int flags, void *cb_data) | |
735 | { | |
736 | int retval = 0, i, p = 0, l = 0; | |
737 | struct ref_cache *refs = get_ref_cache(submodule); | |
738 | struct ref_array *packed = get_packed_refs(refs); | |
739 | struct ref_array *loose = get_loose_refs(refs); | |
740 | ||
741 | struct ref_array *extra = &extra_refs; | |
742 | ||
743 | for (i = 0; i < extra->nr; i++) | |
744 | retval = do_one_ref(base, fn, trim, flags, cb_data, extra->refs[i]); | |
745 | ||
746 | sort_ref_array(packed); | |
747 | sort_ref_array(loose); | |
748 | while (p < packed->nr && l < loose->nr) { | |
749 | struct ref_entry *entry; | |
750 | int cmp = strcmp(packed->refs[p]->name, loose->refs[l]->name); | |
751 | if (!cmp) { | |
752 | p++; | |
753 | continue; | |
754 | } | |
755 | if (cmp > 0) { | |
756 | entry = loose->refs[l++]; | |
757 | } else { | |
758 | entry = packed->refs[p++]; | |
759 | } | |
760 | retval = do_one_ref(base, fn, trim, flags, cb_data, entry); | |
761 | if (retval) | |
762 | goto end_each; | |
763 | } | |
764 | ||
765 | if (l < loose->nr) { | |
766 | p = l; | |
767 | packed = loose; | |
768 | } | |
769 | ||
770 | for (; p < packed->nr; p++) { | |
771 | retval = do_one_ref(base, fn, trim, flags, cb_data, packed->refs[p]); | |
772 | if (retval) | |
773 | goto end_each; | |
774 | } | |
775 | ||
776 | end_each: | |
777 | current_ref = NULL; | |
778 | return retval; | |
779 | } | |
780 | ||
781 | ||
782 | static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data) | |
783 | { | |
784 | unsigned char sha1[20]; | |
785 | int flag; | |
786 | ||
787 | if (submodule) { | |
788 | if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0) | |
789 | return fn("HEAD", sha1, 0, cb_data); | |
790 | ||
791 | return 0; | |
792 | } | |
793 | ||
794 | if (!read_ref_full("HEAD", sha1, 1, &flag)) | |
795 | return fn("HEAD", sha1, flag, cb_data); | |
796 | ||
797 | return 0; | |
798 | } | |
799 | ||
800 | int head_ref(each_ref_fn fn, void *cb_data) | |
801 | { | |
802 | return do_head_ref(NULL, fn, cb_data); | |
803 | } | |
804 | ||
805 | int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) | |
806 | { | |
807 | return do_head_ref(submodule, fn, cb_data); | |
808 | } | |
809 | ||
810 | int for_each_ref(each_ref_fn fn, void *cb_data) | |
811 | { | |
812 | return do_for_each_ref(NULL, "", fn, 0, 0, cb_data); | |
813 | } | |
814 | ||
815 | int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) | |
816 | { | |
817 | return do_for_each_ref(submodule, "", fn, 0, 0, cb_data); | |
818 | } | |
819 | ||
820 | int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data) | |
821 | { | |
822 | return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data); | |
823 | } | |
824 | ||
825 | int for_each_ref_in_submodule(const char *submodule, const char *prefix, | |
826 | each_ref_fn fn, void *cb_data) | |
827 | { | |
828 | return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data); | |
829 | } | |
830 | ||
831 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) | |
832 | { | |
833 | return for_each_ref_in("refs/tags/", fn, cb_data); | |
834 | } | |
835 | ||
836 | int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) | |
837 | { | |
838 | return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data); | |
839 | } | |
840 | ||
841 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) | |
842 | { | |
843 | return for_each_ref_in("refs/heads/", fn, cb_data); | |
844 | } | |
845 | ||
846 | int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) | |
847 | { | |
848 | return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data); | |
849 | } | |
850 | ||
851 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) | |
852 | { | |
853 | return for_each_ref_in("refs/remotes/", fn, cb_data); | |
854 | } | |
855 | ||
856 | int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) | |
857 | { | |
858 | return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data); | |
859 | } | |
860 | ||
861 | int for_each_replace_ref(each_ref_fn fn, void *cb_data) | |
862 | { | |
863 | return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data); | |
864 | } | |
865 | ||
866 | int head_ref_namespaced(each_ref_fn fn, void *cb_data) | |
867 | { | |
868 | struct strbuf buf = STRBUF_INIT; | |
869 | int ret = 0; | |
870 | unsigned char sha1[20]; | |
871 | int flag; | |
872 | ||
873 | strbuf_addf(&buf, "%sHEAD", get_git_namespace()); | |
874 | if (!read_ref_full(buf.buf, sha1, 1, &flag)) | |
875 | ret = fn(buf.buf, sha1, flag, cb_data); | |
876 | strbuf_release(&buf); | |
877 | ||
878 | return ret; | |
879 | } | |
880 | ||
881 | int for_each_namespaced_ref(each_ref_fn fn, void *cb_data) | |
882 | { | |
883 | struct strbuf buf = STRBUF_INIT; | |
884 | int ret; | |
885 | strbuf_addf(&buf, "%srefs/", get_git_namespace()); | |
886 | ret = do_for_each_ref(NULL, buf.buf, fn, 0, 0, cb_data); | |
887 | strbuf_release(&buf); | |
888 | return ret; | |
889 | } | |
890 | ||
891 | int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, | |
892 | const char *prefix, void *cb_data) | |
893 | { | |
894 | struct strbuf real_pattern = STRBUF_INIT; | |
895 | struct ref_filter filter; | |
896 | int ret; | |
897 | ||
898 | if (!prefix && prefixcmp(pattern, "refs/")) | |
899 | strbuf_addstr(&real_pattern, "refs/"); | |
900 | else if (prefix) | |
901 | strbuf_addstr(&real_pattern, prefix); | |
902 | strbuf_addstr(&real_pattern, pattern); | |
903 | ||
904 | if (!has_glob_specials(pattern)) { | |
905 | /* Append implied '/' '*' if not present. */ | |
906 | if (real_pattern.buf[real_pattern.len - 1] != '/') | |
907 | strbuf_addch(&real_pattern, '/'); | |
908 | /* No need to check for '*', there is none. */ | |
909 | strbuf_addch(&real_pattern, '*'); | |
910 | } | |
911 | ||
912 | filter.pattern = real_pattern.buf; | |
913 | filter.fn = fn; | |
914 | filter.cb_data = cb_data; | |
915 | ret = for_each_ref(filter_refs, &filter); | |
916 | ||
917 | strbuf_release(&real_pattern); | |
918 | return ret; | |
919 | } | |
920 | ||
921 | int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data) | |
922 | { | |
923 | return for_each_glob_ref_in(fn, pattern, NULL, cb_data); | |
924 | } | |
925 | ||
926 | int for_each_rawref(each_ref_fn fn, void *cb_data) | |
927 | { | |
928 | return do_for_each_ref(NULL, "", fn, 0, | |
929 | DO_FOR_EACH_INCLUDE_BROKEN, cb_data); | |
930 | } | |
931 | ||
932 | /* | |
933 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
934 | * We do not like it if: | |
935 | * | |
936 | * - any path component of it begins with ".", or | |
937 | * - it has double dots "..", or | |
938 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
939 | * - it ends with a "/". | |
940 | * - it ends with ".lock" | |
941 | * - it contains a "\" (backslash) | |
942 | */ | |
943 | ||
944 | /* Return true iff ch is not allowed in reference names. */ | |
945 | static inline int bad_ref_char(int ch) | |
946 | { | |
947 | if (((unsigned) ch) <= ' ' || ch == 0x7f || | |
948 | ch == '~' || ch == '^' || ch == ':' || ch == '\\') | |
949 | return 1; | |
950 | /* 2.13 Pattern Matching Notation */ | |
951 | if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */ | |
952 | return 1; | |
953 | return 0; | |
954 | } | |
955 | ||
956 | /* | |
957 | * Try to read one refname component from the front of refname. Return | |
958 | * the length of the component found, or -1 if the component is not | |
959 | * legal. | |
960 | */ | |
961 | static int check_refname_component(const char *refname, int flags) | |
962 | { | |
963 | const char *cp; | |
964 | char last = '\0'; | |
965 | ||
966 | for (cp = refname; ; cp++) { | |
967 | char ch = *cp; | |
968 | if (ch == '\0' || ch == '/') | |
969 | break; | |
970 | if (bad_ref_char(ch)) | |
971 | return -1; /* Illegal character in refname. */ | |
972 | if (last == '.' && ch == '.') | |
973 | return -1; /* Refname contains "..". */ | |
974 | if (last == '@' && ch == '{') | |
975 | return -1; /* Refname contains "@{". */ | |
976 | last = ch; | |
977 | } | |
978 | if (cp == refname) | |
979 | return -1; /* Component has zero length. */ | |
980 | if (refname[0] == '.') { | |
981 | if (!(flags & REFNAME_DOT_COMPONENT)) | |
982 | return -1; /* Component starts with '.'. */ | |
983 | /* | |
984 | * Even if leading dots are allowed, don't allow "." | |
985 | * as a component (".." is prevented by a rule above). | |
986 | */ | |
987 | if (refname[1] == '\0') | |
988 | return -1; /* Component equals ".". */ | |
989 | } | |
990 | if (cp - refname >= 5 && !memcmp(cp - 5, ".lock", 5)) | |
991 | return -1; /* Refname ends with ".lock". */ | |
992 | return cp - refname; | |
993 | } | |
994 | ||
995 | int check_refname_format(const char *refname, int flags) | |
996 | { | |
997 | int component_len, component_count = 0; | |
998 | ||
999 | while (1) { | |
1000 | /* We are at the start of a path component. */ | |
1001 | component_len = check_refname_component(refname, flags); | |
1002 | if (component_len < 0) { | |
1003 | if ((flags & REFNAME_REFSPEC_PATTERN) && | |
1004 | refname[0] == '*' && | |
1005 | (refname[1] == '\0' || refname[1] == '/')) { | |
1006 | /* Accept one wildcard as a full refname component. */ | |
1007 | flags &= ~REFNAME_REFSPEC_PATTERN; | |
1008 | component_len = 1; | |
1009 | } else { | |
1010 | return -1; | |
1011 | } | |
1012 | } | |
1013 | component_count++; | |
1014 | if (refname[component_len] == '\0') | |
1015 | break; | |
1016 | /* Skip to next component. */ | |
1017 | refname += component_len + 1; | |
1018 | } | |
1019 | ||
1020 | if (refname[component_len - 1] == '.') | |
1021 | return -1; /* Refname ends with '.'. */ | |
1022 | if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2) | |
1023 | return -1; /* Refname has only one component. */ | |
1024 | return 0; | |
1025 | } | |
1026 | ||
1027 | const char *prettify_refname(const char *name) | |
1028 | { | |
1029 | return name + ( | |
1030 | !prefixcmp(name, "refs/heads/") ? 11 : | |
1031 | !prefixcmp(name, "refs/tags/") ? 10 : | |
1032 | !prefixcmp(name, "refs/remotes/") ? 13 : | |
1033 | 0); | |
1034 | } | |
1035 | ||
1036 | const char *ref_rev_parse_rules[] = { | |
1037 | "%.*s", | |
1038 | "refs/%.*s", | |
1039 | "refs/tags/%.*s", | |
1040 | "refs/heads/%.*s", | |
1041 | "refs/remotes/%.*s", | |
1042 | "refs/remotes/%.*s/HEAD", | |
1043 | NULL | |
1044 | }; | |
1045 | ||
1046 | int refname_match(const char *abbrev_name, const char *full_name, const char **rules) | |
1047 | { | |
1048 | const char **p; | |
1049 | const int abbrev_name_len = strlen(abbrev_name); | |
1050 | ||
1051 | for (p = rules; *p; p++) { | |
1052 | if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { | |
1053 | return 1; | |
1054 | } | |
1055 | } | |
1056 | ||
1057 | return 0; | |
1058 | } | |
1059 | ||
1060 | static struct ref_lock *verify_lock(struct ref_lock *lock, | |
1061 | const unsigned char *old_sha1, int mustexist) | |
1062 | { | |
1063 | if (read_ref_full(lock->ref_name, lock->old_sha1, mustexist, NULL)) { | |
1064 | error("Can't verify ref %s", lock->ref_name); | |
1065 | unlock_ref(lock); | |
1066 | return NULL; | |
1067 | } | |
1068 | if (hashcmp(lock->old_sha1, old_sha1)) { | |
1069 | error("Ref %s is at %s but expected %s", lock->ref_name, | |
1070 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); | |
1071 | unlock_ref(lock); | |
1072 | return NULL; | |
1073 | } | |
1074 | return lock; | |
1075 | } | |
1076 | ||
1077 | static int remove_empty_directories(const char *file) | |
1078 | { | |
1079 | /* we want to create a file but there is a directory there; | |
1080 | * if that is an empty directory (or a directory that contains | |
1081 | * only empty directories), remove them. | |
1082 | */ | |
1083 | struct strbuf path; | |
1084 | int result; | |
1085 | ||
1086 | strbuf_init(&path, 20); | |
1087 | strbuf_addstr(&path, file); | |
1088 | ||
1089 | result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY); | |
1090 | ||
1091 | strbuf_release(&path); | |
1092 | ||
1093 | return result; | |
1094 | } | |
1095 | ||
1096 | /* | |
1097 | * Return true iff a reference named refname could be created without | |
1098 | * conflicting with the name of an existing reference. If oldrefname | |
1099 | * is non-NULL, ignore potential conflicts with oldrefname (e.g., | |
1100 | * because oldrefname is scheduled for deletion in the same | |
1101 | * operation). | |
1102 | */ | |
1103 | static int is_refname_available(const char *refname, const char *oldrefname, | |
1104 | struct ref_array *array) | |
1105 | { | |
1106 | int i, namlen = strlen(refname); /* e.g. 'foo/bar' */ | |
1107 | for (i = 0; i < array->nr; i++ ) { | |
1108 | struct ref_entry *entry = array->refs[i]; | |
1109 | /* entry->name could be 'foo' or 'foo/bar/baz' */ | |
1110 | if (!oldrefname || strcmp(oldrefname, entry->name)) { | |
1111 | int len = strlen(entry->name); | |
1112 | int cmplen = (namlen < len) ? namlen : len; | |
1113 | const char *lead = (namlen < len) ? entry->name : refname; | |
1114 | if (!strncmp(refname, entry->name, cmplen) && | |
1115 | lead[cmplen] == '/') { | |
1116 | error("'%s' exists; cannot create '%s'", | |
1117 | entry->name, refname); | |
1118 | return 0; | |
1119 | } | |
1120 | } | |
1121 | } | |
1122 | return 1; | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * *string and *len will only be substituted, and *string returned (for | |
1127 | * later free()ing) if the string passed in is a magic short-hand form | |
1128 | * to name a branch. | |
1129 | */ | |
1130 | static char *substitute_branch_name(const char **string, int *len) | |
1131 | { | |
1132 | struct strbuf buf = STRBUF_INIT; | |
1133 | int ret = interpret_branch_name(*string, &buf); | |
1134 | ||
1135 | if (ret == *len) { | |
1136 | size_t size; | |
1137 | *string = strbuf_detach(&buf, &size); | |
1138 | *len = size; | |
1139 | return (char *)*string; | |
1140 | } | |
1141 | ||
1142 | return NULL; | |
1143 | } | |
1144 | ||
1145 | int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref) | |
1146 | { | |
1147 | char *last_branch = substitute_branch_name(&str, &len); | |
1148 | const char **p, *r; | |
1149 | int refs_found = 0; | |
1150 | ||
1151 | *ref = NULL; | |
1152 | for (p = ref_rev_parse_rules; *p; p++) { | |
1153 | char fullref[PATH_MAX]; | |
1154 | unsigned char sha1_from_ref[20]; | |
1155 | unsigned char *this_result; | |
1156 | int flag; | |
1157 | ||
1158 | this_result = refs_found ? sha1_from_ref : sha1; | |
1159 | mksnpath(fullref, sizeof(fullref), *p, len, str); | |
1160 | r = resolve_ref_unsafe(fullref, this_result, 1, &flag); | |
1161 | if (r) { | |
1162 | if (!refs_found++) | |
1163 | *ref = xstrdup(r); | |
1164 | if (!warn_ambiguous_refs) | |
1165 | break; | |
1166 | } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) { | |
1167 | warning("ignoring dangling symref %s.", fullref); | |
1168 | } else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) { | |
1169 | warning("ignoring broken ref %s.", fullref); | |
1170 | } | |
1171 | } | |
1172 | free(last_branch); | |
1173 | return refs_found; | |
1174 | } | |
1175 | ||
1176 | int dwim_log(const char *str, int len, unsigned char *sha1, char **log) | |
1177 | { | |
1178 | char *last_branch = substitute_branch_name(&str, &len); | |
1179 | const char **p; | |
1180 | int logs_found = 0; | |
1181 | ||
1182 | *log = NULL; | |
1183 | for (p = ref_rev_parse_rules; *p; p++) { | |
1184 | struct stat st; | |
1185 | unsigned char hash[20]; | |
1186 | char path[PATH_MAX]; | |
1187 | const char *ref, *it; | |
1188 | ||
1189 | mksnpath(path, sizeof(path), *p, len, str); | |
1190 | ref = resolve_ref_unsafe(path, hash, 1, NULL); | |
1191 | if (!ref) | |
1192 | continue; | |
1193 | if (!stat(git_path("logs/%s", path), &st) && | |
1194 | S_ISREG(st.st_mode)) | |
1195 | it = path; | |
1196 | else if (strcmp(ref, path) && | |
1197 | !stat(git_path("logs/%s", ref), &st) && | |
1198 | S_ISREG(st.st_mode)) | |
1199 | it = ref; | |
1200 | else | |
1201 | continue; | |
1202 | if (!logs_found++) { | |
1203 | *log = xstrdup(it); | |
1204 | hashcpy(sha1, hash); | |
1205 | } | |
1206 | if (!warn_ambiguous_refs) | |
1207 | break; | |
1208 | } | |
1209 | free(last_branch); | |
1210 | return logs_found; | |
1211 | } | |
1212 | ||
1213 | static struct ref_lock *lock_ref_sha1_basic(const char *refname, | |
1214 | const unsigned char *old_sha1, | |
1215 | int flags, int *type_p) | |
1216 | { | |
1217 | char *ref_file; | |
1218 | const char *orig_refname = refname; | |
1219 | struct ref_lock *lock; | |
1220 | int last_errno = 0; | |
1221 | int type, lflags; | |
1222 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); | |
1223 | int missing = 0; | |
1224 | ||
1225 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
1226 | lock->lock_fd = -1; | |
1227 | ||
1228 | refname = resolve_ref_unsafe(refname, lock->old_sha1, mustexist, &type); | |
1229 | if (!refname && errno == EISDIR) { | |
1230 | /* we are trying to lock foo but we used to | |
1231 | * have foo/bar which now does not exist; | |
1232 | * it is normal for the empty directory 'foo' | |
1233 | * to remain. | |
1234 | */ | |
1235 | ref_file = git_path("%s", orig_refname); | |
1236 | if (remove_empty_directories(ref_file)) { | |
1237 | last_errno = errno; | |
1238 | error("there are still refs under '%s'", orig_refname); | |
1239 | goto error_return; | |
1240 | } | |
1241 | refname = resolve_ref_unsafe(orig_refname, lock->old_sha1, mustexist, &type); | |
1242 | } | |
1243 | if (type_p) | |
1244 | *type_p = type; | |
1245 | if (!refname) { | |
1246 | last_errno = errno; | |
1247 | error("unable to resolve reference %s: %s", | |
1248 | orig_refname, strerror(errno)); | |
1249 | goto error_return; | |
1250 | } | |
1251 | missing = is_null_sha1(lock->old_sha1); | |
1252 | /* When the ref did not exist and we are creating it, | |
1253 | * make sure there is no existing ref that is packed | |
1254 | * whose name begins with our refname, nor a ref whose | |
1255 | * name is a proper prefix of our refname. | |
1256 | */ | |
1257 | if (missing && | |
1258 | !is_refname_available(refname, NULL, get_packed_refs(get_ref_cache(NULL)))) { | |
1259 | last_errno = ENOTDIR; | |
1260 | goto error_return; | |
1261 | } | |
1262 | ||
1263 | lock->lk = xcalloc(1, sizeof(struct lock_file)); | |
1264 | ||
1265 | lflags = LOCK_DIE_ON_ERROR; | |
1266 | if (flags & REF_NODEREF) { | |
1267 | refname = orig_refname; | |
1268 | lflags |= LOCK_NODEREF; | |
1269 | } | |
1270 | lock->ref_name = xstrdup(refname); | |
1271 | lock->orig_ref_name = xstrdup(orig_refname); | |
1272 | ref_file = git_path("%s", refname); | |
1273 | if (missing) | |
1274 | lock->force_write = 1; | |
1275 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
1276 | lock->force_write = 1; | |
1277 | ||
1278 | if (safe_create_leading_directories(ref_file)) { | |
1279 | last_errno = errno; | |
1280 | error("unable to create directory for %s", ref_file); | |
1281 | goto error_return; | |
1282 | } | |
1283 | ||
1284 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags); | |
1285 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; | |
1286 | ||
1287 | error_return: | |
1288 | unlock_ref(lock); | |
1289 | errno = last_errno; | |
1290 | return NULL; | |
1291 | } | |
1292 | ||
1293 | struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha1) | |
1294 | { | |
1295 | char refpath[PATH_MAX]; | |
1296 | if (check_refname_format(refname, 0)) | |
1297 | return NULL; | |
1298 | strcpy(refpath, mkpath("refs/%s", refname)); | |
1299 | return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL); | |
1300 | } | |
1301 | ||
1302 | struct ref_lock *lock_any_ref_for_update(const char *refname, | |
1303 | const unsigned char *old_sha1, int flags) | |
1304 | { | |
1305 | if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) | |
1306 | return NULL; | |
1307 | return lock_ref_sha1_basic(refname, old_sha1, flags, NULL); | |
1308 | } | |
1309 | ||
1310 | static struct lock_file packlock; | |
1311 | ||
1312 | static int repack_without_ref(const char *refname) | |
1313 | { | |
1314 | struct ref_array *packed; | |
1315 | int fd, i; | |
1316 | ||
1317 | packed = get_packed_refs(get_ref_cache(NULL)); | |
1318 | if (search_ref_array(packed, refname) == NULL) | |
1319 | return 0; | |
1320 | fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0); | |
1321 | if (fd < 0) { | |
1322 | unable_to_lock_error(git_path("packed-refs"), errno); | |
1323 | return error("cannot delete '%s' from packed refs", refname); | |
1324 | } | |
1325 | ||
1326 | for (i = 0; i < packed->nr; i++) { | |
1327 | char line[PATH_MAX + 100]; | |
1328 | int len; | |
1329 | struct ref_entry *ref = packed->refs[i]; | |
1330 | ||
1331 | if (!strcmp(refname, ref->name)) | |
1332 | continue; | |
1333 | len = snprintf(line, sizeof(line), "%s %s\n", | |
1334 | sha1_to_hex(ref->sha1), ref->name); | |
1335 | /* this should not happen but just being defensive */ | |
1336 | if (len > sizeof(line)) | |
1337 | die("too long a refname '%s'", ref->name); | |
1338 | write_or_die(fd, line, len); | |
1339 | } | |
1340 | return commit_lock_file(&packlock); | |
1341 | } | |
1342 | ||
1343 | int delete_ref(const char *refname, const unsigned char *sha1, int delopt) | |
1344 | { | |
1345 | struct ref_lock *lock; | |
1346 | int err, i = 0, ret = 0, flag = 0; | |
1347 | ||
1348 | lock = lock_ref_sha1_basic(refname, sha1, 0, &flag); | |
1349 | if (!lock) | |
1350 | return 1; | |
1351 | if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) { | |
1352 | /* loose */ | |
1353 | const char *path; | |
1354 | ||
1355 | if (!(delopt & REF_NODEREF)) { | |
1356 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
1357 | lock->lk->filename[i] = 0; | |
1358 | path = lock->lk->filename; | |
1359 | } else { | |
1360 | path = git_path("%s", refname); | |
1361 | } | |
1362 | err = unlink_or_warn(path); | |
1363 | if (err && errno != ENOENT) | |
1364 | ret = 1; | |
1365 | ||
1366 | if (!(delopt & REF_NODEREF)) | |
1367 | lock->lk->filename[i] = '.'; | |
1368 | } | |
1369 | /* removing the loose one could have resurrected an earlier | |
1370 | * packed one. Also, if it was not loose we need to repack | |
1371 | * without it. | |
1372 | */ | |
1373 | ret |= repack_without_ref(refname); | |
1374 | ||
1375 | unlink_or_warn(git_path("logs/%s", lock->ref_name)); | |
1376 | invalidate_ref_cache(NULL); | |
1377 | unlock_ref(lock); | |
1378 | return ret; | |
1379 | } | |
1380 | ||
1381 | /* | |
1382 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
1383 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
1384 | * | |
1385 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
1386 | * live into logs/refs. | |
1387 | */ | |
1388 | #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log" | |
1389 | ||
1390 | int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg) | |
1391 | { | |
1392 | unsigned char sha1[20], orig_sha1[20]; | |
1393 | int flag = 0, logmoved = 0; | |
1394 | struct ref_lock *lock; | |
1395 | struct stat loginfo; | |
1396 | int log = !lstat(git_path("logs/%s", oldrefname), &loginfo); | |
1397 | const char *symref = NULL; | |
1398 | struct ref_cache *refs = get_ref_cache(NULL); | |
1399 | ||
1400 | if (log && S_ISLNK(loginfo.st_mode)) | |
1401 | return error("reflog for %s is a symlink", oldrefname); | |
1402 | ||
1403 | symref = resolve_ref_unsafe(oldrefname, orig_sha1, 1, &flag); | |
1404 | if (flag & REF_ISSYMREF) | |
1405 | return error("refname %s is a symbolic ref, renaming it is not supported", | |
1406 | oldrefname); | |
1407 | if (!symref) | |
1408 | return error("refname %s not found", oldrefname); | |
1409 | ||
1410 | if (!is_refname_available(newrefname, oldrefname, get_packed_refs(refs))) | |
1411 | return 1; | |
1412 | ||
1413 | if (!is_refname_available(newrefname, oldrefname, get_loose_refs(refs))) | |
1414 | return 1; | |
1415 | ||
1416 | if (log && rename(git_path("logs/%s", oldrefname), git_path(TMP_RENAMED_LOG))) | |
1417 | return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s", | |
1418 | oldrefname, strerror(errno)); | |
1419 | ||
1420 | if (delete_ref(oldrefname, orig_sha1, REF_NODEREF)) { | |
1421 | error("unable to delete old %s", oldrefname); | |
1422 | goto rollback; | |
1423 | } | |
1424 | ||
1425 | if (!read_ref_full(newrefname, sha1, 1, &flag) && | |
1426 | delete_ref(newrefname, sha1, REF_NODEREF)) { | |
1427 | if (errno==EISDIR) { | |
1428 | if (remove_empty_directories(git_path("%s", newrefname))) { | |
1429 | error("Directory not empty: %s", newrefname); | |
1430 | goto rollback; | |
1431 | } | |
1432 | } else { | |
1433 | error("unable to delete existing %s", newrefname); | |
1434 | goto rollback; | |
1435 | } | |
1436 | } | |
1437 | ||
1438 | if (log && safe_create_leading_directories(git_path("logs/%s", newrefname))) { | |
1439 | error("unable to create directory for %s", newrefname); | |
1440 | goto rollback; | |
1441 | } | |
1442 | ||
1443 | retry: | |
1444 | if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname))) { | |
1445 | if (errno==EISDIR || errno==ENOTDIR) { | |
1446 | /* | |
1447 | * rename(a, b) when b is an existing | |
1448 | * directory ought to result in ISDIR, but | |
1449 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
1450 | */ | |
1451 | if (remove_empty_directories(git_path("logs/%s", newrefname))) { | |
1452 | error("Directory not empty: logs/%s", newrefname); | |
1453 | goto rollback; | |
1454 | } | |
1455 | goto retry; | |
1456 | } else { | |
1457 | error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s", | |
1458 | newrefname, strerror(errno)); | |
1459 | goto rollback; | |
1460 | } | |
1461 | } | |
1462 | logmoved = log; | |
1463 | ||
1464 | lock = lock_ref_sha1_basic(newrefname, NULL, 0, NULL); | |
1465 | if (!lock) { | |
1466 | error("unable to lock %s for update", newrefname); | |
1467 | goto rollback; | |
1468 | } | |
1469 | lock->force_write = 1; | |
1470 | hashcpy(lock->old_sha1, orig_sha1); | |
1471 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { | |
1472 | error("unable to write current sha1 into %s", newrefname); | |
1473 | goto rollback; | |
1474 | } | |
1475 | ||
1476 | return 0; | |
1477 | ||
1478 | rollback: | |
1479 | lock = lock_ref_sha1_basic(oldrefname, NULL, 0, NULL); | |
1480 | if (!lock) { | |
1481 | error("unable to lock %s for rollback", oldrefname); | |
1482 | goto rollbacklog; | |
1483 | } | |
1484 | ||
1485 | lock->force_write = 1; | |
1486 | flag = log_all_ref_updates; | |
1487 | log_all_ref_updates = 0; | |
1488 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
1489 | error("unable to write current sha1 into %s", oldrefname); | |
1490 | log_all_ref_updates = flag; | |
1491 | ||
1492 | rollbacklog: | |
1493 | if (logmoved && rename(git_path("logs/%s", newrefname), git_path("logs/%s", oldrefname))) | |
1494 | error("unable to restore logfile %s from %s: %s", | |
1495 | oldrefname, newrefname, strerror(errno)); | |
1496 | if (!logmoved && log && | |
1497 | rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldrefname))) | |
1498 | error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s", | |
1499 | oldrefname, strerror(errno)); | |
1500 | ||
1501 | return 1; | |
1502 | } | |
1503 | ||
1504 | int close_ref(struct ref_lock *lock) | |
1505 | { | |
1506 | if (close_lock_file(lock->lk)) | |
1507 | return -1; | |
1508 | lock->lock_fd = -1; | |
1509 | return 0; | |
1510 | } | |
1511 | ||
1512 | int commit_ref(struct ref_lock *lock) | |
1513 | { | |
1514 | if (commit_lock_file(lock->lk)) | |
1515 | return -1; | |
1516 | lock->lock_fd = -1; | |
1517 | return 0; | |
1518 | } | |
1519 | ||
1520 | void unlock_ref(struct ref_lock *lock) | |
1521 | { | |
1522 | /* Do not free lock->lk -- atexit() still looks at them */ | |
1523 | if (lock->lk) | |
1524 | rollback_lock_file(lock->lk); | |
1525 | free(lock->ref_name); | |
1526 | free(lock->orig_ref_name); | |
1527 | free(lock); | |
1528 | } | |
1529 | ||
1530 | /* | |
1531 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
1532 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
1533 | * because reflog file is one line per entry. | |
1534 | */ | |
1535 | static int copy_msg(char *buf, const char *msg) | |
1536 | { | |
1537 | char *cp = buf; | |
1538 | char c; | |
1539 | int wasspace = 1; | |
1540 | ||
1541 | *cp++ = '\t'; | |
1542 | while ((c = *msg++)) { | |
1543 | if (wasspace && isspace(c)) | |
1544 | continue; | |
1545 | wasspace = isspace(c); | |
1546 | if (wasspace) | |
1547 | c = ' '; | |
1548 | *cp++ = c; | |
1549 | } | |
1550 | while (buf < cp && isspace(cp[-1])) | |
1551 | cp--; | |
1552 | *cp++ = '\n'; | |
1553 | return cp - buf; | |
1554 | } | |
1555 | ||
1556 | int log_ref_setup(const char *refname, char *logfile, int bufsize) | |
1557 | { | |
1558 | int logfd, oflags = O_APPEND | O_WRONLY; | |
1559 | ||
1560 | git_snpath(logfile, bufsize, "logs/%s", refname); | |
1561 | if (log_all_ref_updates && | |
1562 | (!prefixcmp(refname, "refs/heads/") || | |
1563 | !prefixcmp(refname, "refs/remotes/") || | |
1564 | !prefixcmp(refname, "refs/notes/") || | |
1565 | !strcmp(refname, "HEAD"))) { | |
1566 | if (safe_create_leading_directories(logfile) < 0) | |
1567 | return error("unable to create directory for %s", | |
1568 | logfile); | |
1569 | oflags |= O_CREAT; | |
1570 | } | |
1571 | ||
1572 | logfd = open(logfile, oflags, 0666); | |
1573 | if (logfd < 0) { | |
1574 | if (!(oflags & O_CREAT) && errno == ENOENT) | |
1575 | return 0; | |
1576 | ||
1577 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
1578 | if (remove_empty_directories(logfile)) { | |
1579 | return error("There are still logs under '%s'", | |
1580 | logfile); | |
1581 | } | |
1582 | logfd = open(logfile, oflags, 0666); | |
1583 | } | |
1584 | ||
1585 | if (logfd < 0) | |
1586 | return error("Unable to append to %s: %s", | |
1587 | logfile, strerror(errno)); | |
1588 | } | |
1589 | ||
1590 | adjust_shared_perm(logfile); | |
1591 | close(logfd); | |
1592 | return 0; | |
1593 | } | |
1594 | ||
1595 | static int log_ref_write(const char *refname, const unsigned char *old_sha1, | |
1596 | const unsigned char *new_sha1, const char *msg) | |
1597 | { | |
1598 | int logfd, result, written, oflags = O_APPEND | O_WRONLY; | |
1599 | unsigned maxlen, len; | |
1600 | int msglen; | |
1601 | char log_file[PATH_MAX]; | |
1602 | char *logrec; | |
1603 | const char *committer; | |
1604 | ||
1605 | if (log_all_ref_updates < 0) | |
1606 | log_all_ref_updates = !is_bare_repository(); | |
1607 | ||
1608 | result = log_ref_setup(refname, log_file, sizeof(log_file)); | |
1609 | if (result) | |
1610 | return result; | |
1611 | ||
1612 | logfd = open(log_file, oflags); | |
1613 | if (logfd < 0) | |
1614 | return 0; | |
1615 | msglen = msg ? strlen(msg) : 0; | |
1616 | committer = git_committer_info(0); | |
1617 | maxlen = strlen(committer) + msglen + 100; | |
1618 | logrec = xmalloc(maxlen); | |
1619 | len = sprintf(logrec, "%s %s %s\n", | |
1620 | sha1_to_hex(old_sha1), | |
1621 | sha1_to_hex(new_sha1), | |
1622 | committer); | |
1623 | if (msglen) | |
1624 | len += copy_msg(logrec + len - 1, msg) - 1; | |
1625 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; | |
1626 | free(logrec); | |
1627 | if (close(logfd) != 0 || written != len) | |
1628 | return error("Unable to append to %s", log_file); | |
1629 | return 0; | |
1630 | } | |
1631 | ||
1632 | static int is_branch(const char *refname) | |
1633 | { | |
1634 | return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/"); | |
1635 | } | |
1636 | ||
1637 | int write_ref_sha1(struct ref_lock *lock, | |
1638 | const unsigned char *sha1, const char *logmsg) | |
1639 | { | |
1640 | static char term = '\n'; | |
1641 | struct object *o; | |
1642 | ||
1643 | if (!lock) | |
1644 | return -1; | |
1645 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { | |
1646 | unlock_ref(lock); | |
1647 | return 0; | |
1648 | } | |
1649 | o = parse_object(sha1); | |
1650 | if (!o) { | |
1651 | error("Trying to write ref %s with nonexistent object %s", | |
1652 | lock->ref_name, sha1_to_hex(sha1)); | |
1653 | unlock_ref(lock); | |
1654 | return -1; | |
1655 | } | |
1656 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1657 | error("Trying to write non-commit object %s to branch %s", | |
1658 | sha1_to_hex(sha1), lock->ref_name); | |
1659 | unlock_ref(lock); | |
1660 | return -1; | |
1661 | } | |
1662 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || | |
1663 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
1664 | || close_ref(lock) < 0) { | |
1665 | error("Couldn't write %s", lock->lk->filename); | |
1666 | unlock_ref(lock); | |
1667 | return -1; | |
1668 | } | |
1669 | clear_loose_ref_cache(get_ref_cache(NULL)); | |
1670 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || | |
1671 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
1672 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
1673 | unlock_ref(lock); | |
1674 | return -1; | |
1675 | } | |
1676 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { | |
1677 | /* | |
1678 | * Special hack: If a branch is updated directly and HEAD | |
1679 | * points to it (may happen on the remote side of a push | |
1680 | * for example) then logically the HEAD reflog should be | |
1681 | * updated too. | |
1682 | * A generic solution implies reverse symref information, | |
1683 | * but finding all symrefs pointing to the given branch | |
1684 | * would be rather costly for this rare event (the direct | |
1685 | * update of a branch) to be worth it. So let's cheat and | |
1686 | * check with HEAD only which should cover 99% of all usage | |
1687 | * scenarios (even 100% of the default ones). | |
1688 | */ | |
1689 | unsigned char head_sha1[20]; | |
1690 | int head_flag; | |
1691 | const char *head_ref; | |
1692 | head_ref = resolve_ref_unsafe("HEAD", head_sha1, 1, &head_flag); | |
1693 | if (head_ref && (head_flag & REF_ISSYMREF) && | |
1694 | !strcmp(head_ref, lock->ref_name)) | |
1695 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
1696 | } | |
1697 | if (commit_ref(lock)) { | |
1698 | error("Couldn't set %s", lock->ref_name); | |
1699 | unlock_ref(lock); | |
1700 | return -1; | |
1701 | } | |
1702 | unlock_ref(lock); | |
1703 | return 0; | |
1704 | } | |
1705 | ||
1706 | int create_symref(const char *ref_target, const char *refs_heads_master, | |
1707 | const char *logmsg) | |
1708 | { | |
1709 | const char *lockpath; | |
1710 | char ref[1000]; | |
1711 | int fd, len, written; | |
1712 | char *git_HEAD = git_pathdup("%s", ref_target); | |
1713 | unsigned char old_sha1[20], new_sha1[20]; | |
1714 | ||
1715 | if (logmsg && read_ref(ref_target, old_sha1)) | |
1716 | hashclr(old_sha1); | |
1717 | ||
1718 | if (safe_create_leading_directories(git_HEAD) < 0) | |
1719 | return error("unable to create directory for %s", git_HEAD); | |
1720 | ||
1721 | #ifndef NO_SYMLINK_HEAD | |
1722 | if (prefer_symlink_refs) { | |
1723 | unlink(git_HEAD); | |
1724 | if (!symlink(refs_heads_master, git_HEAD)) | |
1725 | goto done; | |
1726 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); | |
1727 | } | |
1728 | #endif | |
1729 | ||
1730 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
1731 | if (sizeof(ref) <= len) { | |
1732 | error("refname too long: %s", refs_heads_master); | |
1733 | goto error_free_return; | |
1734 | } | |
1735 | lockpath = mkpath("%s.lock", git_HEAD); | |
1736 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
1737 | if (fd < 0) { | |
1738 | error("Unable to open %s for writing", lockpath); | |
1739 | goto error_free_return; | |
1740 | } | |
1741 | written = write_in_full(fd, ref, len); | |
1742 | if (close(fd) != 0 || written != len) { | |
1743 | error("Unable to write to %s", lockpath); | |
1744 | goto error_unlink_return; | |
1745 | } | |
1746 | if (rename(lockpath, git_HEAD) < 0) { | |
1747 | error("Unable to create %s", git_HEAD); | |
1748 | goto error_unlink_return; | |
1749 | } | |
1750 | if (adjust_shared_perm(git_HEAD)) { | |
1751 | error("Unable to fix permissions on %s", lockpath); | |
1752 | error_unlink_return: | |
1753 | unlink_or_warn(lockpath); | |
1754 | error_free_return: | |
1755 | free(git_HEAD); | |
1756 | return -1; | |
1757 | } | |
1758 | ||
1759 | #ifndef NO_SYMLINK_HEAD | |
1760 | done: | |
1761 | #endif | |
1762 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) | |
1763 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
1764 | ||
1765 | free(git_HEAD); | |
1766 | return 0; | |
1767 | } | |
1768 | ||
1769 | static char *ref_msg(const char *line, const char *endp) | |
1770 | { | |
1771 | const char *ep; | |
1772 | line += 82; | |
1773 | ep = memchr(line, '\n', endp - line); | |
1774 | if (!ep) | |
1775 | ep = endp; | |
1776 | return xmemdupz(line, ep - line); | |
1777 | } | |
1778 | ||
1779 | int read_ref_at(const char *refname, unsigned long at_time, int cnt, | |
1780 | unsigned char *sha1, char **msg, | |
1781 | unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt) | |
1782 | { | |
1783 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; | |
1784 | char *tz_c; | |
1785 | int logfd, tz, reccnt = 0; | |
1786 | struct stat st; | |
1787 | unsigned long date; | |
1788 | unsigned char logged_sha1[20]; | |
1789 | void *log_mapped; | |
1790 | size_t mapsz; | |
1791 | ||
1792 | logfile = git_path("logs/%s", refname); | |
1793 | logfd = open(logfile, O_RDONLY, 0); | |
1794 | if (logfd < 0) | |
1795 | die_errno("Unable to read log '%s'", logfile); | |
1796 | fstat(logfd, &st); | |
1797 | if (!st.st_size) | |
1798 | die("Log %s is empty.", logfile); | |
1799 | mapsz = xsize_t(st.st_size); | |
1800 | log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0); | |
1801 | logdata = log_mapped; | |
1802 | close(logfd); | |
1803 | ||
1804 | lastrec = NULL; | |
1805 | rec = logend = logdata + st.st_size; | |
1806 | while (logdata < rec) { | |
1807 | reccnt++; | |
1808 | if (logdata < rec && *(rec-1) == '\n') | |
1809 | rec--; | |
1810 | lastgt = NULL; | |
1811 | while (logdata < rec && *(rec-1) != '\n') { | |
1812 | rec--; | |
1813 | if (*rec == '>') | |
1814 | lastgt = rec; | |
1815 | } | |
1816 | if (!lastgt) | |
1817 | die("Log %s is corrupt.", logfile); | |
1818 | date = strtoul(lastgt + 1, &tz_c, 10); | |
1819 | if (date <= at_time || cnt == 0) { | |
1820 | tz = strtoul(tz_c, NULL, 10); | |
1821 | if (msg) | |
1822 | *msg = ref_msg(rec, logend); | |
1823 | if (cutoff_time) | |
1824 | *cutoff_time = date; | |
1825 | if (cutoff_tz) | |
1826 | *cutoff_tz = tz; | |
1827 | if (cutoff_cnt) | |
1828 | *cutoff_cnt = reccnt - 1; | |
1829 | if (lastrec) { | |
1830 | if (get_sha1_hex(lastrec, logged_sha1)) | |
1831 | die("Log %s is corrupt.", logfile); | |
1832 | if (get_sha1_hex(rec + 41, sha1)) | |
1833 | die("Log %s is corrupt.", logfile); | |
1834 | if (hashcmp(logged_sha1, sha1)) { | |
1835 | warning("Log %s has gap after %s.", | |
1836 | logfile, show_date(date, tz, DATE_RFC2822)); | |
1837 | } | |
1838 | } | |
1839 | else if (date == at_time) { | |
1840 | if (get_sha1_hex(rec + 41, sha1)) | |
1841 | die("Log %s is corrupt.", logfile); | |
1842 | } | |
1843 | else { | |
1844 | if (get_sha1_hex(rec + 41, logged_sha1)) | |
1845 | die("Log %s is corrupt.", logfile); | |
1846 | if (hashcmp(logged_sha1, sha1)) { | |
1847 | warning("Log %s unexpectedly ended on %s.", | |
1848 | logfile, show_date(date, tz, DATE_RFC2822)); | |
1849 | } | |
1850 | } | |
1851 | munmap(log_mapped, mapsz); | |
1852 | return 0; | |
1853 | } | |
1854 | lastrec = rec; | |
1855 | if (cnt > 0) | |
1856 | cnt--; | |
1857 | } | |
1858 | ||
1859 | rec = logdata; | |
1860 | while (rec < logend && *rec != '>' && *rec != '\n') | |
1861 | rec++; | |
1862 | if (rec == logend || *rec == '\n') | |
1863 | die("Log %s is corrupt.", logfile); | |
1864 | date = strtoul(rec + 1, &tz_c, 10); | |
1865 | tz = strtoul(tz_c, NULL, 10); | |
1866 | if (get_sha1_hex(logdata, sha1)) | |
1867 | die("Log %s is corrupt.", logfile); | |
1868 | if (is_null_sha1(sha1)) { | |
1869 | if (get_sha1_hex(logdata + 41, sha1)) | |
1870 | die("Log %s is corrupt.", logfile); | |
1871 | } | |
1872 | if (msg) | |
1873 | *msg = ref_msg(logdata, logend); | |
1874 | munmap(log_mapped, mapsz); | |
1875 | ||
1876 | if (cutoff_time) | |
1877 | *cutoff_time = date; | |
1878 | if (cutoff_tz) | |
1879 | *cutoff_tz = tz; | |
1880 | if (cutoff_cnt) | |
1881 | *cutoff_cnt = reccnt; | |
1882 | return 1; | |
1883 | } | |
1884 | ||
1885 | int for_each_recent_reflog_ent(const char *refname, each_reflog_ent_fn fn, long ofs, void *cb_data) | |
1886 | { | |
1887 | const char *logfile; | |
1888 | FILE *logfp; | |
1889 | struct strbuf sb = STRBUF_INIT; | |
1890 | int ret = 0; | |
1891 | ||
1892 | logfile = git_path("logs/%s", refname); | |
1893 | logfp = fopen(logfile, "r"); | |
1894 | if (!logfp) | |
1895 | return -1; | |
1896 | ||
1897 | if (ofs) { | |
1898 | struct stat statbuf; | |
1899 | if (fstat(fileno(logfp), &statbuf) || | |
1900 | statbuf.st_size < ofs || | |
1901 | fseek(logfp, -ofs, SEEK_END) || | |
1902 | strbuf_getwholeline(&sb, logfp, '\n')) { | |
1903 | fclose(logfp); | |
1904 | strbuf_release(&sb); | |
1905 | return -1; | |
1906 | } | |
1907 | } | |
1908 | ||
1909 | while (!strbuf_getwholeline(&sb, logfp, '\n')) { | |
1910 | unsigned char osha1[20], nsha1[20]; | |
1911 | char *email_end, *message; | |
1912 | unsigned long timestamp; | |
1913 | int tz; | |
1914 | ||
1915 | /* old SP new SP name <email> SP time TAB msg LF */ | |
1916 | if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' || | |
1917 | get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' || | |
1918 | get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' || | |
1919 | !(email_end = strchr(sb.buf + 82, '>')) || | |
1920 | email_end[1] != ' ' || | |
1921 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
1922 | !message || message[0] != ' ' || | |
1923 | (message[1] != '+' && message[1] != '-') || | |
1924 | !isdigit(message[2]) || !isdigit(message[3]) || | |
1925 | !isdigit(message[4]) || !isdigit(message[5])) | |
1926 | continue; /* corrupt? */ | |
1927 | email_end[1] = '\0'; | |
1928 | tz = strtol(message + 1, NULL, 10); | |
1929 | if (message[6] != '\t') | |
1930 | message += 6; | |
1931 | else | |
1932 | message += 7; | |
1933 | ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message, | |
1934 | cb_data); | |
1935 | if (ret) | |
1936 | break; | |
1937 | } | |
1938 | fclose(logfp); | |
1939 | strbuf_release(&sb); | |
1940 | return ret; | |
1941 | } | |
1942 | ||
1943 | int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data) | |
1944 | { | |
1945 | return for_each_recent_reflog_ent(refname, fn, 0, cb_data); | |
1946 | } | |
1947 | ||
1948 | static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data) | |
1949 | { | |
1950 | DIR *dir = opendir(git_path("logs/%s", base)); | |
1951 | int retval = 0; | |
1952 | ||
1953 | if (dir) { | |
1954 | struct dirent *de; | |
1955 | int baselen = strlen(base); | |
1956 | char *log = xmalloc(baselen + 257); | |
1957 | ||
1958 | memcpy(log, base, baselen); | |
1959 | if (baselen && base[baselen-1] != '/') | |
1960 | log[baselen++] = '/'; | |
1961 | ||
1962 | while ((de = readdir(dir)) != NULL) { | |
1963 | struct stat st; | |
1964 | int namelen; | |
1965 | ||
1966 | if (de->d_name[0] == '.') | |
1967 | continue; | |
1968 | namelen = strlen(de->d_name); | |
1969 | if (namelen > 255) | |
1970 | continue; | |
1971 | if (has_extension(de->d_name, ".lock")) | |
1972 | continue; | |
1973 | memcpy(log + baselen, de->d_name, namelen+1); | |
1974 | if (stat(git_path("logs/%s", log), &st) < 0) | |
1975 | continue; | |
1976 | if (S_ISDIR(st.st_mode)) { | |
1977 | retval = do_for_each_reflog(log, fn, cb_data); | |
1978 | } else { | |
1979 | unsigned char sha1[20]; | |
1980 | if (read_ref_full(log, sha1, 0, NULL)) | |
1981 | retval = error("bad ref for %s", log); | |
1982 | else | |
1983 | retval = fn(log, sha1, 0, cb_data); | |
1984 | } | |
1985 | if (retval) | |
1986 | break; | |
1987 | } | |
1988 | free(log); | |
1989 | closedir(dir); | |
1990 | } | |
1991 | else if (*base) | |
1992 | return errno; | |
1993 | return retval; | |
1994 | } | |
1995 | ||
1996 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
1997 | { | |
1998 | return do_for_each_reflog("", fn, cb_data); | |
1999 | } | |
2000 | ||
2001 | int update_ref(const char *action, const char *refname, | |
2002 | const unsigned char *sha1, const unsigned char *oldval, | |
2003 | int flags, enum action_on_err onerr) | |
2004 | { | |
2005 | static struct ref_lock *lock; | |
2006 | lock = lock_any_ref_for_update(refname, oldval, flags); | |
2007 | if (!lock) { | |
2008 | const char *str = "Cannot lock the ref '%s'."; | |
2009 | switch (onerr) { | |
2010 | case MSG_ON_ERR: error(str, refname); break; | |
2011 | case DIE_ON_ERR: die(str, refname); break; | |
2012 | case QUIET_ON_ERR: break; | |
2013 | } | |
2014 | return 1; | |
2015 | } | |
2016 | if (write_ref_sha1(lock, sha1, action) < 0) { | |
2017 | const char *str = "Cannot update the ref '%s'."; | |
2018 | switch (onerr) { | |
2019 | case MSG_ON_ERR: error(str, refname); break; | |
2020 | case DIE_ON_ERR: die(str, refname); break; | |
2021 | case QUIET_ON_ERR: break; | |
2022 | } | |
2023 | return 1; | |
2024 | } | |
2025 | return 0; | |
2026 | } | |
2027 | ||
2028 | int ref_exists(const char *refname) | |
2029 | { | |
2030 | unsigned char sha1[20]; | |
2031 | return !!resolve_ref_unsafe(refname, sha1, 1, NULL); | |
2032 | } | |
2033 | ||
2034 | struct ref *find_ref_by_name(const struct ref *list, const char *name) | |
2035 | { | |
2036 | for ( ; list; list = list->next) | |
2037 | if (!strcmp(list->name, name)) | |
2038 | return (struct ref *)list; | |
2039 | return NULL; | |
2040 | } | |
2041 | ||
2042 | /* | |
2043 | * generate a format suitable for scanf from a ref_rev_parse_rules | |
2044 | * rule, that is replace the "%.*s" spec with a "%s" spec | |
2045 | */ | |
2046 | static void gen_scanf_fmt(char *scanf_fmt, const char *rule) | |
2047 | { | |
2048 | char *spec; | |
2049 | ||
2050 | spec = strstr(rule, "%.*s"); | |
2051 | if (!spec || strstr(spec + 4, "%.*s")) | |
2052 | die("invalid rule in ref_rev_parse_rules: %s", rule); | |
2053 | ||
2054 | /* copy all until spec */ | |
2055 | strncpy(scanf_fmt, rule, spec - rule); | |
2056 | scanf_fmt[spec - rule] = '\0'; | |
2057 | /* copy new spec */ | |
2058 | strcat(scanf_fmt, "%s"); | |
2059 | /* copy remaining rule */ | |
2060 | strcat(scanf_fmt, spec + 4); | |
2061 | ||
2062 | return; | |
2063 | } | |
2064 | ||
2065 | char *shorten_unambiguous_ref(const char *refname, int strict) | |
2066 | { | |
2067 | int i; | |
2068 | static char **scanf_fmts; | |
2069 | static int nr_rules; | |
2070 | char *short_name; | |
2071 | ||
2072 | /* pre generate scanf formats from ref_rev_parse_rules[] */ | |
2073 | if (!nr_rules) { | |
2074 | size_t total_len = 0; | |
2075 | ||
2076 | /* the rule list is NULL terminated, count them first */ | |
2077 | for (; ref_rev_parse_rules[nr_rules]; nr_rules++) | |
2078 | /* no +1 because strlen("%s") < strlen("%.*s") */ | |
2079 | total_len += strlen(ref_rev_parse_rules[nr_rules]); | |
2080 | ||
2081 | scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len); | |
2082 | ||
2083 | total_len = 0; | |
2084 | for (i = 0; i < nr_rules; i++) { | |
2085 | scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] | |
2086 | + total_len; | |
2087 | gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]); | |
2088 | total_len += strlen(ref_rev_parse_rules[i]); | |
2089 | } | |
2090 | } | |
2091 | ||
2092 | /* bail out if there are no rules */ | |
2093 | if (!nr_rules) | |
2094 | return xstrdup(refname); | |
2095 | ||
2096 | /* buffer for scanf result, at most refname must fit */ | |
2097 | short_name = xstrdup(refname); | |
2098 | ||
2099 | /* skip first rule, it will always match */ | |
2100 | for (i = nr_rules - 1; i > 0 ; --i) { | |
2101 | int j; | |
2102 | int rules_to_fail = i; | |
2103 | int short_name_len; | |
2104 | ||
2105 | if (1 != sscanf(refname, scanf_fmts[i], short_name)) | |
2106 | continue; | |
2107 | ||
2108 | short_name_len = strlen(short_name); | |
2109 | ||
2110 | /* | |
2111 | * in strict mode, all (except the matched one) rules | |
2112 | * must fail to resolve to a valid non-ambiguous ref | |
2113 | */ | |
2114 | if (strict) | |
2115 | rules_to_fail = nr_rules; | |
2116 | ||
2117 | /* | |
2118 | * check if the short name resolves to a valid ref, | |
2119 | * but use only rules prior to the matched one | |
2120 | */ | |
2121 | for (j = 0; j < rules_to_fail; j++) { | |
2122 | const char *rule = ref_rev_parse_rules[j]; | |
2123 | char refname[PATH_MAX]; | |
2124 | ||
2125 | /* skip matched rule */ | |
2126 | if (i == j) | |
2127 | continue; | |
2128 | ||
2129 | /* | |
2130 | * the short name is ambiguous, if it resolves | |
2131 | * (with this previous rule) to a valid ref | |
2132 | * read_ref() returns 0 on success | |
2133 | */ | |
2134 | mksnpath(refname, sizeof(refname), | |
2135 | rule, short_name_len, short_name); | |
2136 | if (ref_exists(refname)) | |
2137 | break; | |
2138 | } | |
2139 | ||
2140 | /* | |
2141 | * short name is non-ambiguous if all previous rules | |
2142 | * haven't resolved to a valid ref | |
2143 | */ | |
2144 | if (j == rules_to_fail) | |
2145 | return short_name; | |
2146 | } | |
2147 | ||
2148 | free(short_name); | |
2149 | return xstrdup(refname); | |
2150 | } |