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Commit | Line | Data |
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7bd9bcf3 | 1 | #include "../cache.h" |
b2141fc1 | 2 | #include "../config.h" |
7bd9bcf3 MH |
3 | #include "../refs.h" |
4 | #include "refs-internal.h" | |
958f9646 | 5 | #include "ref-cache.h" |
3bc581b9 | 6 | #include "../iterator.h" |
2880d16f | 7 | #include "../dir-iterator.h" |
7bd9bcf3 MH |
8 | #include "../lockfile.h" |
9 | #include "../object.h" | |
10 | #include "../dir.h" | |
11 | ||
12 | struct ref_lock { | |
13 | char *ref_name; | |
7bd9bcf3 MH |
14 | struct lock_file *lk; |
15 | struct object_id old_oid; | |
16 | }; | |
17 | ||
7bd9bcf3 | 18 | /* |
a8739244 MH |
19 | * Return true if refname, which has the specified oid and flags, can |
20 | * be resolved to an object in the database. If the referred-to object | |
21 | * does not exist, emit a warning and return false. | |
7bd9bcf3 | 22 | */ |
a8739244 MH |
23 | static int ref_resolves_to_object(const char *refname, |
24 | const struct object_id *oid, | |
25 | unsigned int flags) | |
7bd9bcf3 | 26 | { |
a8739244 | 27 | if (flags & REF_ISBROKEN) |
7bd9bcf3 | 28 | return 0; |
a8739244 MH |
29 | if (!has_sha1_file(oid->hash)) { |
30 | error("%s does not point to a valid object!", refname); | |
7bd9bcf3 MH |
31 | return 0; |
32 | } | |
33 | return 1; | |
34 | } | |
35 | ||
7bd9bcf3 | 36 | struct packed_ref_cache { |
7c22bc8a | 37 | struct ref_cache *cache; |
7bd9bcf3 MH |
38 | |
39 | /* | |
40 | * Count of references to the data structure in this instance, | |
65a0a8e5 MH |
41 | * including the pointer from files_ref_store::packed if any. |
42 | * The data will not be freed as long as the reference count | |
43 | * is nonzero. | |
7bd9bcf3 MH |
44 | */ |
45 | unsigned int referrers; | |
46 | ||
47 | /* | |
48 | * Iff the packed-refs file associated with this instance is | |
49 | * currently locked for writing, this points at the associated | |
50 | * lock (which is owned by somebody else). The referrer count | |
51 | * is also incremented when the file is locked and decremented | |
52 | * when it is unlocked. | |
53 | */ | |
54 | struct lock_file *lock; | |
55 | ||
56 | /* The metadata from when this packed-refs cache was read */ | |
57 | struct stat_validity validity; | |
58 | }; | |
59 | ||
60 | /* | |
61 | * Future: need to be in "struct repository" | |
62 | * when doing a full libification. | |
63 | */ | |
00eebe35 MH |
64 | struct files_ref_store { |
65 | struct ref_store base; | |
9e7ec634 | 66 | unsigned int store_flags; |
32c597e7 | 67 | |
f57f37e2 NTND |
68 | char *gitdir; |
69 | char *gitcommondir; | |
33dfb9f3 NTND |
70 | char *packed_refs_path; |
71 | ||
7c22bc8a | 72 | struct ref_cache *loose; |
7bd9bcf3 | 73 | struct packed_ref_cache *packed; |
00eebe35 | 74 | }; |
7bd9bcf3 MH |
75 | |
76 | /* Lock used for the main packed-refs file: */ | |
77 | static struct lock_file packlock; | |
78 | ||
79 | /* | |
80 | * Increment the reference count of *packed_refs. | |
81 | */ | |
82 | static void acquire_packed_ref_cache(struct packed_ref_cache *packed_refs) | |
83 | { | |
84 | packed_refs->referrers++; | |
85 | } | |
86 | ||
87 | /* | |
88 | * Decrease the reference count of *packed_refs. If it goes to zero, | |
89 | * free *packed_refs and return true; otherwise return false. | |
90 | */ | |
91 | static int release_packed_ref_cache(struct packed_ref_cache *packed_refs) | |
92 | { | |
93 | if (!--packed_refs->referrers) { | |
7c22bc8a | 94 | free_ref_cache(packed_refs->cache); |
7bd9bcf3 MH |
95 | stat_validity_clear(&packed_refs->validity); |
96 | free(packed_refs); | |
97 | return 1; | |
98 | } else { | |
99 | return 0; | |
100 | } | |
101 | } | |
102 | ||
65a0a8e5 | 103 | static void clear_packed_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 MH |
104 | { |
105 | if (refs->packed) { | |
106 | struct packed_ref_cache *packed_refs = refs->packed; | |
107 | ||
108 | if (packed_refs->lock) | |
109 | die("internal error: packed-ref cache cleared while locked"); | |
110 | refs->packed = NULL; | |
111 | release_packed_ref_cache(packed_refs); | |
112 | } | |
113 | } | |
114 | ||
65a0a8e5 | 115 | static void clear_loose_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 MH |
116 | { |
117 | if (refs->loose) { | |
7c22bc8a | 118 | free_ref_cache(refs->loose); |
7bd9bcf3 MH |
119 | refs->loose = NULL; |
120 | } | |
121 | } | |
122 | ||
a2d5156c JK |
123 | /* |
124 | * Create a new submodule ref cache and add it to the internal | |
125 | * set of caches. | |
126 | */ | |
9e7ec634 NTND |
127 | static struct ref_store *files_ref_store_create(const char *gitdir, |
128 | unsigned int flags) | |
7bd9bcf3 | 129 | { |
00eebe35 MH |
130 | struct files_ref_store *refs = xcalloc(1, sizeof(*refs)); |
131 | struct ref_store *ref_store = (struct ref_store *)refs; | |
f57f37e2 | 132 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 | 133 | |
fbfd0a29 | 134 | base_ref_store_init(ref_store, &refs_be_files); |
9e7ec634 | 135 | refs->store_flags = flags; |
7bd9bcf3 | 136 | |
f57f37e2 NTND |
137 | refs->gitdir = xstrdup(gitdir); |
138 | get_common_dir_noenv(&sb, gitdir); | |
139 | refs->gitcommondir = strbuf_detach(&sb, NULL); | |
140 | strbuf_addf(&sb, "%s/packed-refs", refs->gitcommondir); | |
141 | refs->packed_refs_path = strbuf_detach(&sb, NULL); | |
7bd9bcf3 | 142 | |
00eebe35 | 143 | return ref_store; |
a2d5156c | 144 | } |
7bd9bcf3 | 145 | |
32c597e7 | 146 | /* |
9e7ec634 NTND |
147 | * Die if refs is not the main ref store. caller is used in any |
148 | * necessary error messages. | |
32c597e7 MH |
149 | */ |
150 | static void files_assert_main_repository(struct files_ref_store *refs, | |
151 | const char *caller) | |
152 | { | |
9e7ec634 NTND |
153 | if (refs->store_flags & REF_STORE_MAIN) |
154 | return; | |
155 | ||
156 | die("BUG: operation %s only allowed for main ref store", caller); | |
32c597e7 MH |
157 | } |
158 | ||
a2d5156c | 159 | /* |
00eebe35 | 160 | * Downcast ref_store to files_ref_store. Die if ref_store is not a |
9e7ec634 NTND |
161 | * files_ref_store. required_flags is compared with ref_store's |
162 | * store_flags to ensure the ref_store has all required capabilities. | |
163 | * "caller" is used in any necessary error messages. | |
a2d5156c | 164 | */ |
9e7ec634 NTND |
165 | static struct files_ref_store *files_downcast(struct ref_store *ref_store, |
166 | unsigned int required_flags, | |
167 | const char *caller) | |
a2d5156c | 168 | { |
32c597e7 MH |
169 | struct files_ref_store *refs; |
170 | ||
00eebe35 MH |
171 | if (ref_store->be != &refs_be_files) |
172 | die("BUG: ref_store is type \"%s\" not \"files\" in %s", | |
173 | ref_store->be->name, caller); | |
2eed2780 | 174 | |
32c597e7 MH |
175 | refs = (struct files_ref_store *)ref_store; |
176 | ||
9e7ec634 NTND |
177 | if ((refs->store_flags & required_flags) != required_flags) |
178 | die("BUG: operation %s requires abilities 0x%x, but only have 0x%x", | |
179 | caller, required_flags, refs->store_flags); | |
2eed2780 | 180 | |
32c597e7 | 181 | return refs; |
7bd9bcf3 MH |
182 | } |
183 | ||
184 | /* The length of a peeled reference line in packed-refs, including EOL: */ | |
185 | #define PEELED_LINE_LENGTH 42 | |
186 | ||
187 | /* | |
188 | * The packed-refs header line that we write out. Perhaps other | |
189 | * traits will be added later. The trailing space is required. | |
190 | */ | |
191 | static const char PACKED_REFS_HEADER[] = | |
192 | "# pack-refs with: peeled fully-peeled \n"; | |
193 | ||
194 | /* | |
195 | * Parse one line from a packed-refs file. Write the SHA1 to sha1. | |
196 | * Return a pointer to the refname within the line (null-terminated), | |
197 | * or NULL if there was a problem. | |
198 | */ | |
199 | static const char *parse_ref_line(struct strbuf *line, unsigned char *sha1) | |
200 | { | |
201 | const char *ref; | |
202 | ||
203 | /* | |
204 | * 42: the answer to everything. | |
205 | * | |
206 | * In this case, it happens to be the answer to | |
207 | * 40 (length of sha1 hex representation) | |
208 | * +1 (space in between hex and name) | |
209 | * +1 (newline at the end of the line) | |
210 | */ | |
211 | if (line->len <= 42) | |
212 | return NULL; | |
213 | ||
214 | if (get_sha1_hex(line->buf, sha1) < 0) | |
215 | return NULL; | |
216 | if (!isspace(line->buf[40])) | |
217 | return NULL; | |
218 | ||
219 | ref = line->buf + 41; | |
220 | if (isspace(*ref)) | |
221 | return NULL; | |
222 | ||
223 | if (line->buf[line->len - 1] != '\n') | |
224 | return NULL; | |
225 | line->buf[--line->len] = 0; | |
226 | ||
227 | return ref; | |
228 | } | |
229 | ||
230 | /* | |
231 | * Read f, which is a packed-refs file, into dir. | |
232 | * | |
233 | * A comment line of the form "# pack-refs with: " may contain zero or | |
234 | * more traits. We interpret the traits as follows: | |
235 | * | |
236 | * No traits: | |
237 | * | |
238 | * Probably no references are peeled. But if the file contains a | |
239 | * peeled value for a reference, we will use it. | |
240 | * | |
241 | * peeled: | |
242 | * | |
243 | * References under "refs/tags/", if they *can* be peeled, *are* | |
244 | * peeled in this file. References outside of "refs/tags/" are | |
245 | * probably not peeled even if they could have been, but if we find | |
246 | * a peeled value for such a reference we will use it. | |
247 | * | |
248 | * fully-peeled: | |
249 | * | |
250 | * All references in the file that can be peeled are peeled. | |
251 | * Inversely (and this is more important), any references in the | |
252 | * file for which no peeled value is recorded is not peelable. This | |
253 | * trait should typically be written alongside "peeled" for | |
254 | * compatibility with older clients, but we do not require it | |
255 | * (i.e., "peeled" is a no-op if "fully-peeled" is set). | |
256 | */ | |
257 | static void read_packed_refs(FILE *f, struct ref_dir *dir) | |
258 | { | |
259 | struct ref_entry *last = NULL; | |
260 | struct strbuf line = STRBUF_INIT; | |
261 | enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE; | |
262 | ||
263 | while (strbuf_getwholeline(&line, f, '\n') != EOF) { | |
264 | unsigned char sha1[20]; | |
265 | const char *refname; | |
266 | const char *traits; | |
267 | ||
268 | if (skip_prefix(line.buf, "# pack-refs with:", &traits)) { | |
269 | if (strstr(traits, " fully-peeled ")) | |
270 | peeled = PEELED_FULLY; | |
271 | else if (strstr(traits, " peeled ")) | |
272 | peeled = PEELED_TAGS; | |
273 | /* perhaps other traits later as well */ | |
274 | continue; | |
275 | } | |
276 | ||
277 | refname = parse_ref_line(&line, sha1); | |
278 | if (refname) { | |
279 | int flag = REF_ISPACKED; | |
280 | ||
281 | if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) { | |
282 | if (!refname_is_safe(refname)) | |
283 | die("packed refname is dangerous: %s", refname); | |
284 | hashclr(sha1); | |
285 | flag |= REF_BAD_NAME | REF_ISBROKEN; | |
286 | } | |
287 | last = create_ref_entry(refname, sha1, flag, 0); | |
288 | if (peeled == PEELED_FULLY || | |
289 | (peeled == PEELED_TAGS && starts_with(refname, "refs/tags/"))) | |
290 | last->flag |= REF_KNOWS_PEELED; | |
a3ade2ba | 291 | add_ref_entry(dir, last); |
7bd9bcf3 MH |
292 | continue; |
293 | } | |
294 | if (last && | |
295 | line.buf[0] == '^' && | |
296 | line.len == PEELED_LINE_LENGTH && | |
297 | line.buf[PEELED_LINE_LENGTH - 1] == '\n' && | |
298 | !get_sha1_hex(line.buf + 1, sha1)) { | |
299 | hashcpy(last->u.value.peeled.hash, sha1); | |
300 | /* | |
301 | * Regardless of what the file header said, | |
302 | * we definitely know the value of *this* | |
303 | * reference: | |
304 | */ | |
305 | last->flag |= REF_KNOWS_PEELED; | |
306 | } | |
307 | } | |
308 | ||
309 | strbuf_release(&line); | |
310 | } | |
311 | ||
33dfb9f3 NTND |
312 | static const char *files_packed_refs_path(struct files_ref_store *refs) |
313 | { | |
314 | return refs->packed_refs_path; | |
315 | } | |
316 | ||
802de3da NTND |
317 | static void files_reflog_path(struct files_ref_store *refs, |
318 | struct strbuf *sb, | |
319 | const char *refname) | |
320 | { | |
321 | if (!refname) { | |
f57f37e2 NTND |
322 | /* |
323 | * FIXME: of course this is wrong in multi worktree | |
324 | * setting. To be fixed real soon. | |
325 | */ | |
326 | strbuf_addf(sb, "%s/logs", refs->gitcommondir); | |
802de3da NTND |
327 | return; |
328 | } | |
329 | ||
f57f37e2 NTND |
330 | switch (ref_type(refname)) { |
331 | case REF_TYPE_PER_WORKTREE: | |
332 | case REF_TYPE_PSEUDOREF: | |
333 | strbuf_addf(sb, "%s/logs/%s", refs->gitdir, refname); | |
334 | break; | |
335 | case REF_TYPE_NORMAL: | |
336 | strbuf_addf(sb, "%s/logs/%s", refs->gitcommondir, refname); | |
337 | break; | |
338 | default: | |
339 | die("BUG: unknown ref type %d of ref %s", | |
340 | ref_type(refname), refname); | |
341 | } | |
802de3da NTND |
342 | } |
343 | ||
19e02f4f NTND |
344 | static void files_ref_path(struct files_ref_store *refs, |
345 | struct strbuf *sb, | |
346 | const char *refname) | |
347 | { | |
f57f37e2 NTND |
348 | switch (ref_type(refname)) { |
349 | case REF_TYPE_PER_WORKTREE: | |
350 | case REF_TYPE_PSEUDOREF: | |
351 | strbuf_addf(sb, "%s/%s", refs->gitdir, refname); | |
352 | break; | |
353 | case REF_TYPE_NORMAL: | |
354 | strbuf_addf(sb, "%s/%s", refs->gitcommondir, refname); | |
355 | break; | |
356 | default: | |
357 | die("BUG: unknown ref type %d of ref %s", | |
358 | ref_type(refname), refname); | |
359 | } | |
19e02f4f NTND |
360 | } |
361 | ||
7bd9bcf3 | 362 | /* |
65a0a8e5 MH |
363 | * Get the packed_ref_cache for the specified files_ref_store, |
364 | * creating it if necessary. | |
7bd9bcf3 | 365 | */ |
65a0a8e5 | 366 | static struct packed_ref_cache *get_packed_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 | 367 | { |
33dfb9f3 | 368 | const char *packed_refs_file = files_packed_refs_path(refs); |
7bd9bcf3 MH |
369 | |
370 | if (refs->packed && | |
371 | !stat_validity_check(&refs->packed->validity, packed_refs_file)) | |
372 | clear_packed_ref_cache(refs); | |
373 | ||
374 | if (!refs->packed) { | |
375 | FILE *f; | |
376 | ||
377 | refs->packed = xcalloc(1, sizeof(*refs->packed)); | |
378 | acquire_packed_ref_cache(refs->packed); | |
df308759 | 379 | refs->packed->cache = create_ref_cache(&refs->base, NULL); |
7c22bc8a | 380 | refs->packed->cache->root->flag &= ~REF_INCOMPLETE; |
7bd9bcf3 MH |
381 | f = fopen(packed_refs_file, "r"); |
382 | if (f) { | |
383 | stat_validity_update(&refs->packed->validity, fileno(f)); | |
7c22bc8a | 384 | read_packed_refs(f, get_ref_dir(refs->packed->cache->root)); |
7bd9bcf3 MH |
385 | fclose(f); |
386 | } | |
387 | } | |
7bd9bcf3 MH |
388 | return refs->packed; |
389 | } | |
390 | ||
391 | static struct ref_dir *get_packed_ref_dir(struct packed_ref_cache *packed_ref_cache) | |
392 | { | |
7c22bc8a | 393 | return get_ref_dir(packed_ref_cache->cache->root); |
7bd9bcf3 MH |
394 | } |
395 | ||
65a0a8e5 | 396 | static struct ref_dir *get_packed_refs(struct files_ref_store *refs) |
7bd9bcf3 MH |
397 | { |
398 | return get_packed_ref_dir(get_packed_ref_cache(refs)); | |
399 | } | |
400 | ||
401 | /* | |
402 | * Add a reference to the in-memory packed reference cache. This may | |
403 | * only be called while the packed-refs file is locked (see | |
404 | * lock_packed_refs()). To actually write the packed-refs file, call | |
405 | * commit_packed_refs(). | |
406 | */ | |
d99825ab MH |
407 | static void add_packed_ref(struct files_ref_store *refs, |
408 | const char *refname, const unsigned char *sha1) | |
7bd9bcf3 | 409 | { |
00eebe35 | 410 | struct packed_ref_cache *packed_ref_cache = get_packed_ref_cache(refs); |
7bd9bcf3 MH |
411 | |
412 | if (!packed_ref_cache->lock) | |
413 | die("internal error: packed refs not locked"); | |
a3ade2ba | 414 | add_ref_entry(get_packed_ref_dir(packed_ref_cache), |
958f9646 | 415 | create_ref_entry(refname, sha1, REF_ISPACKED, 1)); |
7bd9bcf3 MH |
416 | } |
417 | ||
418 | /* | |
419 | * Read the loose references from the namespace dirname into dir | |
420 | * (without recursing). dirname must end with '/'. dir must be the | |
421 | * directory entry corresponding to dirname. | |
422 | */ | |
df308759 MH |
423 | static void loose_fill_ref_dir(struct ref_store *ref_store, |
424 | struct ref_dir *dir, const char *dirname) | |
7bd9bcf3 | 425 | { |
df308759 MH |
426 | struct files_ref_store *refs = |
427 | files_downcast(ref_store, REF_STORE_READ, "fill_ref_dir"); | |
7bd9bcf3 MH |
428 | DIR *d; |
429 | struct dirent *de; | |
430 | int dirnamelen = strlen(dirname); | |
431 | struct strbuf refname; | |
432 | struct strbuf path = STRBUF_INIT; | |
433 | size_t path_baselen; | |
434 | ||
19e02f4f | 435 | files_ref_path(refs, &path, dirname); |
7bd9bcf3 MH |
436 | path_baselen = path.len; |
437 | ||
438 | d = opendir(path.buf); | |
439 | if (!d) { | |
440 | strbuf_release(&path); | |
441 | return; | |
442 | } | |
443 | ||
444 | strbuf_init(&refname, dirnamelen + 257); | |
445 | strbuf_add(&refname, dirname, dirnamelen); | |
446 | ||
447 | while ((de = readdir(d)) != NULL) { | |
448 | unsigned char sha1[20]; | |
449 | struct stat st; | |
450 | int flag; | |
451 | ||
452 | if (de->d_name[0] == '.') | |
453 | continue; | |
454 | if (ends_with(de->d_name, ".lock")) | |
455 | continue; | |
456 | strbuf_addstr(&refname, de->d_name); | |
457 | strbuf_addstr(&path, de->d_name); | |
458 | if (stat(path.buf, &st) < 0) { | |
459 | ; /* silently ignore */ | |
460 | } else if (S_ISDIR(st.st_mode)) { | |
461 | strbuf_addch(&refname, '/'); | |
462 | add_entry_to_dir(dir, | |
e00d1a4f | 463 | create_dir_entry(dir->cache, refname.buf, |
7bd9bcf3 MH |
464 | refname.len, 1)); |
465 | } else { | |
7d2df051 | 466 | if (!refs_resolve_ref_unsafe(&refs->base, |
3c0cb0cb MH |
467 | refname.buf, |
468 | RESOLVE_REF_READING, | |
469 | sha1, &flag)) { | |
7bd9bcf3 MH |
470 | hashclr(sha1); |
471 | flag |= REF_ISBROKEN; | |
472 | } else if (is_null_sha1(sha1)) { | |
473 | /* | |
474 | * It is so astronomically unlikely | |
475 | * that NULL_SHA1 is the SHA-1 of an | |
476 | * actual object that we consider its | |
477 | * appearance in a loose reference | |
478 | * file to be repo corruption | |
479 | * (probably due to a software bug). | |
480 | */ | |
481 | flag |= REF_ISBROKEN; | |
482 | } | |
483 | ||
484 | if (check_refname_format(refname.buf, | |
485 | REFNAME_ALLOW_ONELEVEL)) { | |
486 | if (!refname_is_safe(refname.buf)) | |
487 | die("loose refname is dangerous: %s", refname.buf); | |
488 | hashclr(sha1); | |
489 | flag |= REF_BAD_NAME | REF_ISBROKEN; | |
490 | } | |
491 | add_entry_to_dir(dir, | |
492 | create_ref_entry(refname.buf, sha1, flag, 0)); | |
493 | } | |
494 | strbuf_setlen(&refname, dirnamelen); | |
495 | strbuf_setlen(&path, path_baselen); | |
496 | } | |
497 | strbuf_release(&refname); | |
498 | strbuf_release(&path); | |
499 | closedir(d); | |
e3bf2989 MH |
500 | |
501 | /* | |
502 | * Manually add refs/bisect, which, being per-worktree, might | |
503 | * not appear in the directory listing for refs/ in the main | |
504 | * repo. | |
505 | */ | |
506 | if (!strcmp(dirname, "refs/")) { | |
507 | int pos = search_ref_dir(dir, "refs/bisect/", 12); | |
508 | ||
509 | if (pos < 0) { | |
510 | struct ref_entry *child_entry = create_dir_entry( | |
511 | dir->cache, "refs/bisect/", 12, 1); | |
512 | add_entry_to_dir(dir, child_entry); | |
513 | } | |
514 | } | |
7bd9bcf3 MH |
515 | } |
516 | ||
a714b19c | 517 | static struct ref_cache *get_loose_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 MH |
518 | { |
519 | if (!refs->loose) { | |
520 | /* | |
521 | * Mark the top-level directory complete because we | |
522 | * are about to read the only subdirectory that can | |
523 | * hold references: | |
524 | */ | |
df308759 | 525 | refs->loose = create_ref_cache(&refs->base, loose_fill_ref_dir); |
7c22bc8a MH |
526 | |
527 | /* We're going to fill the top level ourselves: */ | |
528 | refs->loose->root->flag &= ~REF_INCOMPLETE; | |
529 | ||
7bd9bcf3 | 530 | /* |
7c22bc8a MH |
531 | * Add an incomplete entry for "refs/" (to be filled |
532 | * lazily): | |
7bd9bcf3 | 533 | */ |
7c22bc8a | 534 | add_entry_to_dir(get_ref_dir(refs->loose->root), |
e00d1a4f | 535 | create_dir_entry(refs->loose, "refs/", 5, 1)); |
7bd9bcf3 | 536 | } |
a714b19c | 537 | return refs->loose; |
7bd9bcf3 MH |
538 | } |
539 | ||
7bd9bcf3 MH |
540 | /* |
541 | * Return the ref_entry for the given refname from the packed | |
542 | * references. If it does not exist, return NULL. | |
543 | */ | |
f0d21efc MH |
544 | static struct ref_entry *get_packed_ref(struct files_ref_store *refs, |
545 | const char *refname) | |
7bd9bcf3 | 546 | { |
bc1c696e | 547 | return find_ref_entry(get_packed_refs(refs), refname); |
7bd9bcf3 MH |
548 | } |
549 | ||
550 | /* | |
419c6f4c | 551 | * A loose ref file doesn't exist; check for a packed ref. |
7bd9bcf3 | 552 | */ |
611118d0 MH |
553 | static int resolve_packed_ref(struct files_ref_store *refs, |
554 | const char *refname, | |
555 | unsigned char *sha1, unsigned int *flags) | |
7bd9bcf3 MH |
556 | { |
557 | struct ref_entry *entry; | |
558 | ||
559 | /* | |
560 | * The loose reference file does not exist; check for a packed | |
561 | * reference. | |
562 | */ | |
f0d21efc | 563 | entry = get_packed_ref(refs, refname); |
7bd9bcf3 MH |
564 | if (entry) { |
565 | hashcpy(sha1, entry->u.value.oid.hash); | |
a70a93b7 | 566 | *flags |= REF_ISPACKED; |
7bd9bcf3 MH |
567 | return 0; |
568 | } | |
419c6f4c MH |
569 | /* refname is not a packed reference. */ |
570 | return -1; | |
7bd9bcf3 MH |
571 | } |
572 | ||
e1e33b72 MH |
573 | static int files_read_raw_ref(struct ref_store *ref_store, |
574 | const char *refname, unsigned char *sha1, | |
575 | struct strbuf *referent, unsigned int *type) | |
7bd9bcf3 | 576 | { |
4308651c | 577 | struct files_ref_store *refs = |
9e7ec634 | 578 | files_downcast(ref_store, REF_STORE_READ, "read_raw_ref"); |
42a38cf7 MH |
579 | struct strbuf sb_contents = STRBUF_INIT; |
580 | struct strbuf sb_path = STRBUF_INIT; | |
7048653a DT |
581 | const char *path; |
582 | const char *buf; | |
583 | struct stat st; | |
584 | int fd; | |
42a38cf7 MH |
585 | int ret = -1; |
586 | int save_errno; | |
e8c42cb9 | 587 | int remaining_retries = 3; |
7bd9bcf3 | 588 | |
fa96ea1b | 589 | *type = 0; |
42a38cf7 | 590 | strbuf_reset(&sb_path); |
34c7ad8f | 591 | |
19e02f4f | 592 | files_ref_path(refs, &sb_path, refname); |
34c7ad8f | 593 | |
42a38cf7 | 594 | path = sb_path.buf; |
7bd9bcf3 | 595 | |
7048653a DT |
596 | stat_ref: |
597 | /* | |
598 | * We might have to loop back here to avoid a race | |
599 | * condition: first we lstat() the file, then we try | |
600 | * to read it as a link or as a file. But if somebody | |
601 | * changes the type of the file (file <-> directory | |
602 | * <-> symlink) between the lstat() and reading, then | |
603 | * we don't want to report that as an error but rather | |
604 | * try again starting with the lstat(). | |
e8c42cb9 JK |
605 | * |
606 | * We'll keep a count of the retries, though, just to avoid | |
607 | * any confusing situation sending us into an infinite loop. | |
7048653a | 608 | */ |
7bd9bcf3 | 609 | |
e8c42cb9 JK |
610 | if (remaining_retries-- <= 0) |
611 | goto out; | |
612 | ||
7048653a DT |
613 | if (lstat(path, &st) < 0) { |
614 | if (errno != ENOENT) | |
42a38cf7 | 615 | goto out; |
611118d0 | 616 | if (resolve_packed_ref(refs, refname, sha1, type)) { |
7048653a | 617 | errno = ENOENT; |
42a38cf7 | 618 | goto out; |
7bd9bcf3 | 619 | } |
42a38cf7 MH |
620 | ret = 0; |
621 | goto out; | |
7bd9bcf3 | 622 | } |
7bd9bcf3 | 623 | |
7048653a DT |
624 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
625 | if (S_ISLNK(st.st_mode)) { | |
42a38cf7 MH |
626 | strbuf_reset(&sb_contents); |
627 | if (strbuf_readlink(&sb_contents, path, 0) < 0) { | |
7048653a | 628 | if (errno == ENOENT || errno == EINVAL) |
7bd9bcf3 MH |
629 | /* inconsistent with lstat; retry */ |
630 | goto stat_ref; | |
631 | else | |
42a38cf7 | 632 | goto out; |
7bd9bcf3 | 633 | } |
42a38cf7 MH |
634 | if (starts_with(sb_contents.buf, "refs/") && |
635 | !check_refname_format(sb_contents.buf, 0)) { | |
92b38093 | 636 | strbuf_swap(&sb_contents, referent); |
3a0b6b9a | 637 | *type |= REF_ISSYMREF; |
42a38cf7 MH |
638 | ret = 0; |
639 | goto out; | |
7bd9bcf3 | 640 | } |
3f7bd767 JK |
641 | /* |
642 | * It doesn't look like a refname; fall through to just | |
643 | * treating it like a non-symlink, and reading whatever it | |
644 | * points to. | |
645 | */ | |
7048653a | 646 | } |
7bd9bcf3 | 647 | |
7048653a DT |
648 | /* Is it a directory? */ |
649 | if (S_ISDIR(st.st_mode)) { | |
e167a567 MH |
650 | /* |
651 | * Even though there is a directory where the loose | |
652 | * ref is supposed to be, there could still be a | |
653 | * packed ref: | |
654 | */ | |
611118d0 | 655 | if (resolve_packed_ref(refs, refname, sha1, type)) { |
e167a567 MH |
656 | errno = EISDIR; |
657 | goto out; | |
658 | } | |
659 | ret = 0; | |
42a38cf7 | 660 | goto out; |
7048653a DT |
661 | } |
662 | ||
663 | /* | |
664 | * Anything else, just open it and try to use it as | |
665 | * a ref | |
666 | */ | |
667 | fd = open(path, O_RDONLY); | |
668 | if (fd < 0) { | |
3f7bd767 | 669 | if (errno == ENOENT && !S_ISLNK(st.st_mode)) |
7048653a DT |
670 | /* inconsistent with lstat; retry */ |
671 | goto stat_ref; | |
672 | else | |
42a38cf7 | 673 | goto out; |
7048653a | 674 | } |
42a38cf7 MH |
675 | strbuf_reset(&sb_contents); |
676 | if (strbuf_read(&sb_contents, fd, 256) < 0) { | |
7048653a DT |
677 | int save_errno = errno; |
678 | close(fd); | |
679 | errno = save_errno; | |
42a38cf7 | 680 | goto out; |
7048653a DT |
681 | } |
682 | close(fd); | |
42a38cf7 MH |
683 | strbuf_rtrim(&sb_contents); |
684 | buf = sb_contents.buf; | |
7048653a DT |
685 | if (starts_with(buf, "ref:")) { |
686 | buf += 4; | |
7bd9bcf3 MH |
687 | while (isspace(*buf)) |
688 | buf++; | |
7048653a | 689 | |
92b38093 MH |
690 | strbuf_reset(referent); |
691 | strbuf_addstr(referent, buf); | |
3a0b6b9a | 692 | *type |= REF_ISSYMREF; |
42a38cf7 MH |
693 | ret = 0; |
694 | goto out; | |
7bd9bcf3 | 695 | } |
7bd9bcf3 | 696 | |
7048653a DT |
697 | /* |
698 | * Please note that FETCH_HEAD has additional | |
699 | * data after the sha. | |
700 | */ | |
701 | if (get_sha1_hex(buf, sha1) || | |
702 | (buf[40] != '\0' && !isspace(buf[40]))) { | |
3a0b6b9a | 703 | *type |= REF_ISBROKEN; |
7048653a | 704 | errno = EINVAL; |
42a38cf7 | 705 | goto out; |
7048653a DT |
706 | } |
707 | ||
42a38cf7 | 708 | ret = 0; |
7bd9bcf3 | 709 | |
42a38cf7 MH |
710 | out: |
711 | save_errno = errno; | |
7bd9bcf3 MH |
712 | strbuf_release(&sb_path); |
713 | strbuf_release(&sb_contents); | |
42a38cf7 | 714 | errno = save_errno; |
7bd9bcf3 MH |
715 | return ret; |
716 | } | |
717 | ||
8415d247 MH |
718 | static void unlock_ref(struct ref_lock *lock) |
719 | { | |
720 | /* Do not free lock->lk -- atexit() still looks at them */ | |
721 | if (lock->lk) | |
722 | rollback_lock_file(lock->lk); | |
723 | free(lock->ref_name); | |
8415d247 MH |
724 | free(lock); |
725 | } | |
726 | ||
92b1551b MH |
727 | /* |
728 | * Lock refname, without following symrefs, and set *lock_p to point | |
729 | * at a newly-allocated lock object. Fill in lock->old_oid, referent, | |
730 | * and type similarly to read_raw_ref(). | |
731 | * | |
732 | * The caller must verify that refname is a "safe" reference name (in | |
733 | * the sense of refname_is_safe()) before calling this function. | |
734 | * | |
735 | * If the reference doesn't already exist, verify that refname doesn't | |
736 | * have a D/F conflict with any existing references. extras and skip | |
524a9fdb | 737 | * are passed to refs_verify_refname_available() for this check. |
92b1551b MH |
738 | * |
739 | * If mustexist is not set and the reference is not found or is | |
740 | * broken, lock the reference anyway but clear sha1. | |
741 | * | |
742 | * Return 0 on success. On failure, write an error message to err and | |
743 | * return TRANSACTION_NAME_CONFLICT or TRANSACTION_GENERIC_ERROR. | |
744 | * | |
745 | * Implementation note: This function is basically | |
746 | * | |
747 | * lock reference | |
748 | * read_raw_ref() | |
749 | * | |
750 | * but it includes a lot more code to | |
751 | * - Deal with possible races with other processes | |
524a9fdb | 752 | * - Avoid calling refs_verify_refname_available() when it can be |
92b1551b MH |
753 | * avoided, namely if we were successfully able to read the ref |
754 | * - Generate informative error messages in the case of failure | |
755 | */ | |
f7b0a987 MH |
756 | static int lock_raw_ref(struct files_ref_store *refs, |
757 | const char *refname, int mustexist, | |
92b1551b MH |
758 | const struct string_list *extras, |
759 | const struct string_list *skip, | |
760 | struct ref_lock **lock_p, | |
761 | struct strbuf *referent, | |
762 | unsigned int *type, | |
763 | struct strbuf *err) | |
764 | { | |
765 | struct ref_lock *lock; | |
766 | struct strbuf ref_file = STRBUF_INIT; | |
767 | int attempts_remaining = 3; | |
768 | int ret = TRANSACTION_GENERIC_ERROR; | |
769 | ||
770 | assert(err); | |
32c597e7 | 771 | files_assert_main_repository(refs, "lock_raw_ref"); |
f7b0a987 | 772 | |
92b1551b MH |
773 | *type = 0; |
774 | ||
775 | /* First lock the file so it can't change out from under us. */ | |
776 | ||
777 | *lock_p = lock = xcalloc(1, sizeof(*lock)); | |
778 | ||
779 | lock->ref_name = xstrdup(refname); | |
19e02f4f | 780 | files_ref_path(refs, &ref_file, refname); |
92b1551b MH |
781 | |
782 | retry: | |
783 | switch (safe_create_leading_directories(ref_file.buf)) { | |
784 | case SCLD_OK: | |
785 | break; /* success */ | |
786 | case SCLD_EXISTS: | |
787 | /* | |
788 | * Suppose refname is "refs/foo/bar". We just failed | |
789 | * to create the containing directory, "refs/foo", | |
790 | * because there was a non-directory in the way. This | |
791 | * indicates a D/F conflict, probably because of | |
792 | * another reference such as "refs/foo". There is no | |
793 | * reason to expect this error to be transitory. | |
794 | */ | |
7d2df051 NTND |
795 | if (refs_verify_refname_available(&refs->base, refname, |
796 | extras, skip, err)) { | |
92b1551b MH |
797 | if (mustexist) { |
798 | /* | |
799 | * To the user the relevant error is | |
800 | * that the "mustexist" reference is | |
801 | * missing: | |
802 | */ | |
803 | strbuf_reset(err); | |
804 | strbuf_addf(err, "unable to resolve reference '%s'", | |
805 | refname); | |
806 | } else { | |
807 | /* | |
808 | * The error message set by | |
524a9fdb MH |
809 | * refs_verify_refname_available() is |
810 | * OK. | |
92b1551b MH |
811 | */ |
812 | ret = TRANSACTION_NAME_CONFLICT; | |
813 | } | |
814 | } else { | |
815 | /* | |
816 | * The file that is in the way isn't a loose | |
817 | * reference. Report it as a low-level | |
818 | * failure. | |
819 | */ | |
820 | strbuf_addf(err, "unable to create lock file %s.lock; " | |
821 | "non-directory in the way", | |
822 | ref_file.buf); | |
823 | } | |
824 | goto error_return; | |
825 | case SCLD_VANISHED: | |
826 | /* Maybe another process was tidying up. Try again. */ | |
827 | if (--attempts_remaining > 0) | |
828 | goto retry; | |
829 | /* fall through */ | |
830 | default: | |
831 | strbuf_addf(err, "unable to create directory for %s", | |
832 | ref_file.buf); | |
833 | goto error_return; | |
834 | } | |
835 | ||
836 | if (!lock->lk) | |
837 | lock->lk = xcalloc(1, sizeof(struct lock_file)); | |
838 | ||
839 | if (hold_lock_file_for_update(lock->lk, ref_file.buf, LOCK_NO_DEREF) < 0) { | |
840 | if (errno == ENOENT && --attempts_remaining > 0) { | |
841 | /* | |
842 | * Maybe somebody just deleted one of the | |
843 | * directories leading to ref_file. Try | |
844 | * again: | |
845 | */ | |
846 | goto retry; | |
847 | } else { | |
848 | unable_to_lock_message(ref_file.buf, errno, err); | |
849 | goto error_return; | |
850 | } | |
851 | } | |
852 | ||
853 | /* | |
854 | * Now we hold the lock and can read the reference without | |
855 | * fear that its value will change. | |
856 | */ | |
857 | ||
f7b0a987 | 858 | if (files_read_raw_ref(&refs->base, refname, |
e1e33b72 | 859 | lock->old_oid.hash, referent, type)) { |
92b1551b MH |
860 | if (errno == ENOENT) { |
861 | if (mustexist) { | |
862 | /* Garden variety missing reference. */ | |
863 | strbuf_addf(err, "unable to resolve reference '%s'", | |
864 | refname); | |
865 | goto error_return; | |
866 | } else { | |
867 | /* | |
868 | * Reference is missing, but that's OK. We | |
869 | * know that there is not a conflict with | |
870 | * another loose reference because | |
871 | * (supposing that we are trying to lock | |
872 | * reference "refs/foo/bar"): | |
873 | * | |
874 | * - We were successfully able to create | |
875 | * the lockfile refs/foo/bar.lock, so we | |
876 | * know there cannot be a loose reference | |
877 | * named "refs/foo". | |
878 | * | |
879 | * - We got ENOENT and not EISDIR, so we | |
880 | * know that there cannot be a loose | |
881 | * reference named "refs/foo/bar/baz". | |
882 | */ | |
883 | } | |
884 | } else if (errno == EISDIR) { | |
885 | /* | |
886 | * There is a directory in the way. It might have | |
887 | * contained references that have been deleted. If | |
888 | * we don't require that the reference already | |
889 | * exists, try to remove the directory so that it | |
890 | * doesn't cause trouble when we want to rename the | |
891 | * lockfile into place later. | |
892 | */ | |
893 | if (mustexist) { | |
894 | /* Garden variety missing reference. */ | |
895 | strbuf_addf(err, "unable to resolve reference '%s'", | |
896 | refname); | |
897 | goto error_return; | |
898 | } else if (remove_dir_recursively(&ref_file, | |
899 | REMOVE_DIR_EMPTY_ONLY)) { | |
b05855b5 MH |
900 | if (refs_verify_refname_available( |
901 | &refs->base, refname, | |
902 | extras, skip, err)) { | |
92b1551b MH |
903 | /* |
904 | * The error message set by | |
905 | * verify_refname_available() is OK. | |
906 | */ | |
907 | ret = TRANSACTION_NAME_CONFLICT; | |
908 | goto error_return; | |
909 | } else { | |
910 | /* | |
911 | * We can't delete the directory, | |
912 | * but we also don't know of any | |
913 | * references that it should | |
914 | * contain. | |
915 | */ | |
916 | strbuf_addf(err, "there is a non-empty directory '%s' " | |
917 | "blocking reference '%s'", | |
918 | ref_file.buf, refname); | |
919 | goto error_return; | |
920 | } | |
921 | } | |
922 | } else if (errno == EINVAL && (*type & REF_ISBROKEN)) { | |
923 | strbuf_addf(err, "unable to resolve reference '%s': " | |
924 | "reference broken", refname); | |
925 | goto error_return; | |
926 | } else { | |
927 | strbuf_addf(err, "unable to resolve reference '%s': %s", | |
928 | refname, strerror(errno)); | |
929 | goto error_return; | |
930 | } | |
931 | ||
932 | /* | |
933 | * If the ref did not exist and we are creating it, | |
524a9fdb MH |
934 | * make sure there is no existing ref that conflicts |
935 | * with refname: | |
92b1551b | 936 | */ |
524a9fdb MH |
937 | if (refs_verify_refname_available( |
938 | &refs->base, refname, | |
939 | extras, skip, err)) | |
92b1551b | 940 | goto error_return; |
92b1551b MH |
941 | } |
942 | ||
943 | ret = 0; | |
944 | goto out; | |
945 | ||
946 | error_return: | |
947 | unlock_ref(lock); | |
948 | *lock_p = NULL; | |
949 | ||
950 | out: | |
951 | strbuf_release(&ref_file); | |
952 | return ret; | |
953 | } | |
954 | ||
bd427cf2 MH |
955 | static int files_peel_ref(struct ref_store *ref_store, |
956 | const char *refname, unsigned char *sha1) | |
7bd9bcf3 | 957 | { |
9e7ec634 NTND |
958 | struct files_ref_store *refs = |
959 | files_downcast(ref_store, REF_STORE_READ | REF_STORE_ODB, | |
960 | "peel_ref"); | |
7bd9bcf3 MH |
961 | int flag; |
962 | unsigned char base[20]; | |
963 | ||
4c4de895 MH |
964 | if (current_ref_iter && current_ref_iter->refname == refname) { |
965 | struct object_id peeled; | |
966 | ||
967 | if (ref_iterator_peel(current_ref_iter, &peeled)) | |
7bd9bcf3 | 968 | return -1; |
4c4de895 | 969 | hashcpy(sha1, peeled.hash); |
7bd9bcf3 MH |
970 | return 0; |
971 | } | |
972 | ||
2f40e954 NTND |
973 | if (refs_read_ref_full(ref_store, refname, |
974 | RESOLVE_REF_READING, base, &flag)) | |
7bd9bcf3 MH |
975 | return -1; |
976 | ||
977 | /* | |
978 | * If the reference is packed, read its ref_entry from the | |
979 | * cache in the hope that we already know its peeled value. | |
980 | * We only try this optimization on packed references because | |
981 | * (a) forcing the filling of the loose reference cache could | |
982 | * be expensive and (b) loose references anyway usually do not | |
983 | * have REF_KNOWS_PEELED. | |
984 | */ | |
985 | if (flag & REF_ISPACKED) { | |
f0d21efc | 986 | struct ref_entry *r = get_packed_ref(refs, refname); |
7bd9bcf3 MH |
987 | if (r) { |
988 | if (peel_entry(r, 0)) | |
989 | return -1; | |
990 | hashcpy(sha1, r->u.value.peeled.hash); | |
991 | return 0; | |
992 | } | |
993 | } | |
994 | ||
995 | return peel_object(base, sha1); | |
996 | } | |
997 | ||
3bc581b9 MH |
998 | struct files_ref_iterator { |
999 | struct ref_iterator base; | |
1000 | ||
7bd9bcf3 | 1001 | struct packed_ref_cache *packed_ref_cache; |
3bc581b9 MH |
1002 | struct ref_iterator *iter0; |
1003 | unsigned int flags; | |
1004 | }; | |
7bd9bcf3 | 1005 | |
3bc581b9 MH |
1006 | static int files_ref_iterator_advance(struct ref_iterator *ref_iterator) |
1007 | { | |
1008 | struct files_ref_iterator *iter = | |
1009 | (struct files_ref_iterator *)ref_iterator; | |
1010 | int ok; | |
7bd9bcf3 | 1011 | |
3bc581b9 | 1012 | while ((ok = ref_iterator_advance(iter->iter0)) == ITER_OK) { |
0c09ec07 DT |
1013 | if (iter->flags & DO_FOR_EACH_PER_WORKTREE_ONLY && |
1014 | ref_type(iter->iter0->refname) != REF_TYPE_PER_WORKTREE) | |
1015 | continue; | |
1016 | ||
3bc581b9 MH |
1017 | if (!(iter->flags & DO_FOR_EACH_INCLUDE_BROKEN) && |
1018 | !ref_resolves_to_object(iter->iter0->refname, | |
1019 | iter->iter0->oid, | |
1020 | iter->iter0->flags)) | |
1021 | continue; | |
1022 | ||
1023 | iter->base.refname = iter->iter0->refname; | |
1024 | iter->base.oid = iter->iter0->oid; | |
1025 | iter->base.flags = iter->iter0->flags; | |
1026 | return ITER_OK; | |
7bd9bcf3 MH |
1027 | } |
1028 | ||
3bc581b9 MH |
1029 | iter->iter0 = NULL; |
1030 | if (ref_iterator_abort(ref_iterator) != ITER_DONE) | |
1031 | ok = ITER_ERROR; | |
1032 | ||
1033 | return ok; | |
7bd9bcf3 MH |
1034 | } |
1035 | ||
3bc581b9 MH |
1036 | static int files_ref_iterator_peel(struct ref_iterator *ref_iterator, |
1037 | struct object_id *peeled) | |
7bd9bcf3 | 1038 | { |
3bc581b9 MH |
1039 | struct files_ref_iterator *iter = |
1040 | (struct files_ref_iterator *)ref_iterator; | |
93770590 | 1041 | |
3bc581b9 MH |
1042 | return ref_iterator_peel(iter->iter0, peeled); |
1043 | } | |
1044 | ||
1045 | static int files_ref_iterator_abort(struct ref_iterator *ref_iterator) | |
1046 | { | |
1047 | struct files_ref_iterator *iter = | |
1048 | (struct files_ref_iterator *)ref_iterator; | |
1049 | int ok = ITER_DONE; | |
1050 | ||
1051 | if (iter->iter0) | |
1052 | ok = ref_iterator_abort(iter->iter0); | |
1053 | ||
1054 | release_packed_ref_cache(iter->packed_ref_cache); | |
1055 | base_ref_iterator_free(ref_iterator); | |
1056 | return ok; | |
1057 | } | |
1058 | ||
1059 | static struct ref_iterator_vtable files_ref_iterator_vtable = { | |
1060 | files_ref_iterator_advance, | |
1061 | files_ref_iterator_peel, | |
1062 | files_ref_iterator_abort | |
1063 | }; | |
1064 | ||
1a769003 | 1065 | static struct ref_iterator *files_ref_iterator_begin( |
37b6f6d5 | 1066 | struct ref_store *ref_store, |
3bc581b9 MH |
1067 | const char *prefix, unsigned int flags) |
1068 | { | |
9e7ec634 | 1069 | struct files_ref_store *refs; |
3bc581b9 MH |
1070 | struct ref_iterator *loose_iter, *packed_iter; |
1071 | struct files_ref_iterator *iter; | |
1072 | struct ref_iterator *ref_iterator; | |
1073 | ||
7bd9bcf3 MH |
1074 | if (ref_paranoia < 0) |
1075 | ref_paranoia = git_env_bool("GIT_REF_PARANOIA", 0); | |
1076 | if (ref_paranoia) | |
3bc581b9 MH |
1077 | flags |= DO_FOR_EACH_INCLUDE_BROKEN; |
1078 | ||
9e7ec634 NTND |
1079 | refs = files_downcast(ref_store, |
1080 | REF_STORE_READ | (ref_paranoia ? 0 : REF_STORE_ODB), | |
1081 | "ref_iterator_begin"); | |
1082 | ||
3bc581b9 MH |
1083 | iter = xcalloc(1, sizeof(*iter)); |
1084 | ref_iterator = &iter->base; | |
1085 | base_ref_iterator_init(ref_iterator, &files_ref_iterator_vtable); | |
1086 | ||
1087 | /* | |
1088 | * We must make sure that all loose refs are read before | |
1089 | * accessing the packed-refs file; this avoids a race | |
1090 | * condition if loose refs are migrated to the packed-refs | |
1091 | * file by a simultaneous process, but our in-memory view is | |
1092 | * from before the migration. We ensure this as follows: | |
059ae35a MH |
1093 | * First, we call start the loose refs iteration with its |
1094 | * `prime_ref` argument set to true. This causes the loose | |
1095 | * references in the subtree to be pre-read into the cache. | |
1096 | * (If they've already been read, that's OK; we only need to | |
1097 | * guarantee that they're read before the packed refs, not | |
1098 | * *how much* before.) After that, we call | |
1099 | * get_packed_ref_cache(), which internally checks whether the | |
1100 | * packed-ref cache is up to date with what is on disk, and | |
1101 | * re-reads it if not. | |
3bc581b9 MH |
1102 | */ |
1103 | ||
059ae35a MH |
1104 | loose_iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), |
1105 | prefix, 1); | |
3bc581b9 MH |
1106 | |
1107 | iter->packed_ref_cache = get_packed_ref_cache(refs); | |
1108 | acquire_packed_ref_cache(iter->packed_ref_cache); | |
059ae35a MH |
1109 | packed_iter = cache_ref_iterator_begin(iter->packed_ref_cache->cache, |
1110 | prefix, 0); | |
3bc581b9 MH |
1111 | |
1112 | iter->iter0 = overlay_ref_iterator_begin(loose_iter, packed_iter); | |
1113 | iter->flags = flags; | |
1114 | ||
1115 | return ref_iterator; | |
7bd9bcf3 MH |
1116 | } |
1117 | ||
7bd9bcf3 MH |
1118 | /* |
1119 | * Verify that the reference locked by lock has the value old_sha1. | |
1120 | * Fail if the reference doesn't exist and mustexist is set. Return 0 | |
1121 | * on success. On error, write an error message to err, set errno, and | |
1122 | * return a negative value. | |
1123 | */ | |
2f40e954 | 1124 | static int verify_lock(struct ref_store *ref_store, struct ref_lock *lock, |
7bd9bcf3 MH |
1125 | const unsigned char *old_sha1, int mustexist, |
1126 | struct strbuf *err) | |
1127 | { | |
1128 | assert(err); | |
1129 | ||
2f40e954 NTND |
1130 | if (refs_read_ref_full(ref_store, lock->ref_name, |
1131 | mustexist ? RESOLVE_REF_READING : 0, | |
1132 | lock->old_oid.hash, NULL)) { | |
6294dcb4 JK |
1133 | if (old_sha1) { |
1134 | int save_errno = errno; | |
0568c8e9 | 1135 | strbuf_addf(err, "can't verify ref '%s'", lock->ref_name); |
6294dcb4 JK |
1136 | errno = save_errno; |
1137 | return -1; | |
1138 | } else { | |
c368dde9 | 1139 | oidclr(&lock->old_oid); |
6294dcb4 JK |
1140 | return 0; |
1141 | } | |
7bd9bcf3 | 1142 | } |
6294dcb4 | 1143 | if (old_sha1 && hashcmp(lock->old_oid.hash, old_sha1)) { |
0568c8e9 | 1144 | strbuf_addf(err, "ref '%s' is at %s but expected %s", |
7bd9bcf3 | 1145 | lock->ref_name, |
c368dde9 | 1146 | oid_to_hex(&lock->old_oid), |
7bd9bcf3 MH |
1147 | sha1_to_hex(old_sha1)); |
1148 | errno = EBUSY; | |
1149 | return -1; | |
1150 | } | |
1151 | return 0; | |
1152 | } | |
1153 | ||
1154 | static int remove_empty_directories(struct strbuf *path) | |
1155 | { | |
1156 | /* | |
1157 | * we want to create a file but there is a directory there; | |
1158 | * if that is an empty directory (or a directory that contains | |
1159 | * only empty directories), remove them. | |
1160 | */ | |
1161 | return remove_dir_recursively(path, REMOVE_DIR_EMPTY_ONLY); | |
1162 | } | |
1163 | ||
3b5d3c98 MH |
1164 | static int create_reflock(const char *path, void *cb) |
1165 | { | |
1166 | struct lock_file *lk = cb; | |
1167 | ||
1168 | return hold_lock_file_for_update(lk, path, LOCK_NO_DEREF) < 0 ? -1 : 0; | |
1169 | } | |
1170 | ||
7bd9bcf3 MH |
1171 | /* |
1172 | * Locks a ref returning the lock on success and NULL on failure. | |
1173 | * On failure errno is set to something meaningful. | |
1174 | */ | |
7eb27cdf MH |
1175 | static struct ref_lock *lock_ref_sha1_basic(struct files_ref_store *refs, |
1176 | const char *refname, | |
7bd9bcf3 MH |
1177 | const unsigned char *old_sha1, |
1178 | const struct string_list *extras, | |
1179 | const struct string_list *skip, | |
bcb497d0 | 1180 | unsigned int flags, int *type, |
7bd9bcf3 MH |
1181 | struct strbuf *err) |
1182 | { | |
1183 | struct strbuf ref_file = STRBUF_INIT; | |
7bd9bcf3 MH |
1184 | struct ref_lock *lock; |
1185 | int last_errno = 0; | |
7bd9bcf3 | 1186 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
7a418f3a | 1187 | int resolve_flags = RESOLVE_REF_NO_RECURSE; |
7a418f3a | 1188 | int resolved; |
7bd9bcf3 | 1189 | |
32c597e7 | 1190 | files_assert_main_repository(refs, "lock_ref_sha1_basic"); |
7bd9bcf3 MH |
1191 | assert(err); |
1192 | ||
1193 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
1194 | ||
1195 | if (mustexist) | |
1196 | resolve_flags |= RESOLVE_REF_READING; | |
2859dcd4 | 1197 | if (flags & REF_DELETING) |
7bd9bcf3 | 1198 | resolve_flags |= RESOLVE_REF_ALLOW_BAD_NAME; |
7bd9bcf3 | 1199 | |
19e02f4f | 1200 | files_ref_path(refs, &ref_file, refname); |
2f40e954 NTND |
1201 | resolved = !!refs_resolve_ref_unsafe(&refs->base, |
1202 | refname, resolve_flags, | |
1203 | lock->old_oid.hash, type); | |
7a418f3a | 1204 | if (!resolved && errno == EISDIR) { |
7bd9bcf3 MH |
1205 | /* |
1206 | * we are trying to lock foo but we used to | |
1207 | * have foo/bar which now does not exist; | |
1208 | * it is normal for the empty directory 'foo' | |
1209 | * to remain. | |
1210 | */ | |
7a418f3a | 1211 | if (remove_empty_directories(&ref_file)) { |
7bd9bcf3 | 1212 | last_errno = errno; |
b05855b5 MH |
1213 | if (!refs_verify_refname_available( |
1214 | &refs->base, | |
1215 | refname, extras, skip, err)) | |
7bd9bcf3 | 1216 | strbuf_addf(err, "there are still refs under '%s'", |
7a418f3a | 1217 | refname); |
7bd9bcf3 MH |
1218 | goto error_return; |
1219 | } | |
2f40e954 NTND |
1220 | resolved = !!refs_resolve_ref_unsafe(&refs->base, |
1221 | refname, resolve_flags, | |
1222 | lock->old_oid.hash, type); | |
7bd9bcf3 | 1223 | } |
7a418f3a | 1224 | if (!resolved) { |
7bd9bcf3 MH |
1225 | last_errno = errno; |
1226 | if (last_errno != ENOTDIR || | |
b05855b5 MH |
1227 | !refs_verify_refname_available(&refs->base, refname, |
1228 | extras, skip, err)) | |
0568c8e9 | 1229 | strbuf_addf(err, "unable to resolve reference '%s': %s", |
7a418f3a | 1230 | refname, strerror(last_errno)); |
7bd9bcf3 MH |
1231 | |
1232 | goto error_return; | |
1233 | } | |
2859dcd4 | 1234 | |
7bd9bcf3 MH |
1235 | /* |
1236 | * If the ref did not exist and we are creating it, make sure | |
1237 | * there is no existing packed ref whose name begins with our | |
1238 | * refname, nor a packed ref whose name is a proper prefix of | |
1239 | * our refname. | |
1240 | */ | |
1241 | if (is_null_oid(&lock->old_oid) && | |
524a9fdb MH |
1242 | refs_verify_refname_available(&refs->base, refname, |
1243 | extras, skip, err)) { | |
7bd9bcf3 MH |
1244 | last_errno = ENOTDIR; |
1245 | goto error_return; | |
1246 | } | |
1247 | ||
1248 | lock->lk = xcalloc(1, sizeof(struct lock_file)); | |
1249 | ||
7bd9bcf3 | 1250 | lock->ref_name = xstrdup(refname); |
7bd9bcf3 | 1251 | |
3b5d3c98 | 1252 | if (raceproof_create_file(ref_file.buf, create_reflock, lock->lk)) { |
7bd9bcf3 | 1253 | last_errno = errno; |
3b5d3c98 | 1254 | unable_to_lock_message(ref_file.buf, errno, err); |
7bd9bcf3 MH |
1255 | goto error_return; |
1256 | } | |
1257 | ||
2f40e954 | 1258 | if (verify_lock(&refs->base, lock, old_sha1, mustexist, err)) { |
7bd9bcf3 MH |
1259 | last_errno = errno; |
1260 | goto error_return; | |
1261 | } | |
1262 | goto out; | |
1263 | ||
1264 | error_return: | |
1265 | unlock_ref(lock); | |
1266 | lock = NULL; | |
1267 | ||
1268 | out: | |
1269 | strbuf_release(&ref_file); | |
7bd9bcf3 MH |
1270 | errno = last_errno; |
1271 | return lock; | |
1272 | } | |
1273 | ||
1274 | /* | |
1275 | * Write an entry to the packed-refs file for the specified refname. | |
1276 | * If peeled is non-NULL, write it as the entry's peeled value. | |
1277 | */ | |
1710fbaf MH |
1278 | static void write_packed_entry(FILE *fh, const char *refname, |
1279 | const unsigned char *sha1, | |
1280 | const unsigned char *peeled) | |
7bd9bcf3 MH |
1281 | { |
1282 | fprintf_or_die(fh, "%s %s\n", sha1_to_hex(sha1), refname); | |
1283 | if (peeled) | |
1284 | fprintf_or_die(fh, "^%s\n", sha1_to_hex(peeled)); | |
1285 | } | |
1286 | ||
7bd9bcf3 MH |
1287 | /* |
1288 | * Lock the packed-refs file for writing. Flags is passed to | |
1289 | * hold_lock_file_for_update(). Return 0 on success. On errors, set | |
1290 | * errno appropriately and return a nonzero value. | |
1291 | */ | |
49c0df6a | 1292 | static int lock_packed_refs(struct files_ref_store *refs, int flags) |
7bd9bcf3 MH |
1293 | { |
1294 | static int timeout_configured = 0; | |
1295 | static int timeout_value = 1000; | |
7bd9bcf3 MH |
1296 | struct packed_ref_cache *packed_ref_cache; |
1297 | ||
32c597e7 | 1298 | files_assert_main_repository(refs, "lock_packed_refs"); |
49c0df6a | 1299 | |
7bd9bcf3 MH |
1300 | if (!timeout_configured) { |
1301 | git_config_get_int("core.packedrefstimeout", &timeout_value); | |
1302 | timeout_configured = 1; | |
1303 | } | |
1304 | ||
1305 | if (hold_lock_file_for_update_timeout( | |
33dfb9f3 | 1306 | &packlock, files_packed_refs_path(refs), |
7bd9bcf3 MH |
1307 | flags, timeout_value) < 0) |
1308 | return -1; | |
1309 | /* | |
1310 | * Get the current packed-refs while holding the lock. If the | |
1311 | * packed-refs file has been modified since we last read it, | |
1312 | * this will automatically invalidate the cache and re-read | |
1313 | * the packed-refs file. | |
1314 | */ | |
00eebe35 | 1315 | packed_ref_cache = get_packed_ref_cache(refs); |
7bd9bcf3 MH |
1316 | packed_ref_cache->lock = &packlock; |
1317 | /* Increment the reference count to prevent it from being freed: */ | |
1318 | acquire_packed_ref_cache(packed_ref_cache); | |
1319 | return 0; | |
1320 | } | |
1321 | ||
1322 | /* | |
1323 | * Write the current version of the packed refs cache from memory to | |
1324 | * disk. The packed-refs file must already be locked for writing (see | |
1325 | * lock_packed_refs()). Return zero on success. On errors, set errno | |
1326 | * and return a nonzero value | |
1327 | */ | |
49c0df6a | 1328 | static int commit_packed_refs(struct files_ref_store *refs) |
7bd9bcf3 MH |
1329 | { |
1330 | struct packed_ref_cache *packed_ref_cache = | |
00eebe35 | 1331 | get_packed_ref_cache(refs); |
1710fbaf | 1332 | int ok, error = 0; |
7bd9bcf3 MH |
1333 | int save_errno = 0; |
1334 | FILE *out; | |
1710fbaf | 1335 | struct ref_iterator *iter; |
7bd9bcf3 | 1336 | |
32c597e7 | 1337 | files_assert_main_repository(refs, "commit_packed_refs"); |
49c0df6a | 1338 | |
7bd9bcf3 MH |
1339 | if (!packed_ref_cache->lock) |
1340 | die("internal error: packed-refs not locked"); | |
1341 | ||
1342 | out = fdopen_lock_file(packed_ref_cache->lock, "w"); | |
1343 | if (!out) | |
1344 | die_errno("unable to fdopen packed-refs descriptor"); | |
1345 | ||
1346 | fprintf_or_die(out, "%s", PACKED_REFS_HEADER); | |
1710fbaf MH |
1347 | |
1348 | iter = cache_ref_iterator_begin(packed_ref_cache->cache, NULL, 0); | |
1349 | while ((ok = ref_iterator_advance(iter)) == ITER_OK) { | |
1350 | struct object_id peeled; | |
1351 | int peel_error = ref_iterator_peel(iter, &peeled); | |
1352 | ||
1353 | write_packed_entry(out, iter->refname, iter->oid->hash, | |
1354 | peel_error ? NULL : peeled.hash); | |
1355 | } | |
1356 | ||
1357 | if (ok != ITER_DONE) | |
1358 | die("error while iterating over references"); | |
7bd9bcf3 MH |
1359 | |
1360 | if (commit_lock_file(packed_ref_cache->lock)) { | |
1361 | save_errno = errno; | |
1362 | error = -1; | |
1363 | } | |
1364 | packed_ref_cache->lock = NULL; | |
1365 | release_packed_ref_cache(packed_ref_cache); | |
1366 | errno = save_errno; | |
1367 | return error; | |
1368 | } | |
1369 | ||
1370 | /* | |
1371 | * Rollback the lockfile for the packed-refs file, and discard the | |
1372 | * in-memory packed reference cache. (The packed-refs file will be | |
1373 | * read anew if it is needed again after this function is called.) | |
1374 | */ | |
49c0df6a | 1375 | static void rollback_packed_refs(struct files_ref_store *refs) |
7bd9bcf3 MH |
1376 | { |
1377 | struct packed_ref_cache *packed_ref_cache = | |
00eebe35 | 1378 | get_packed_ref_cache(refs); |
7bd9bcf3 | 1379 | |
32c597e7 | 1380 | files_assert_main_repository(refs, "rollback_packed_refs"); |
7bd9bcf3 MH |
1381 | |
1382 | if (!packed_ref_cache->lock) | |
1383 | die("internal error: packed-refs not locked"); | |
1384 | rollback_lock_file(packed_ref_cache->lock); | |
1385 | packed_ref_cache->lock = NULL; | |
1386 | release_packed_ref_cache(packed_ref_cache); | |
00eebe35 | 1387 | clear_packed_ref_cache(refs); |
7bd9bcf3 MH |
1388 | } |
1389 | ||
1390 | struct ref_to_prune { | |
1391 | struct ref_to_prune *next; | |
1392 | unsigned char sha1[20]; | |
1393 | char name[FLEX_ARRAY]; | |
1394 | }; | |
1395 | ||
a8f0db2d MH |
1396 | enum { |
1397 | REMOVE_EMPTY_PARENTS_REF = 0x01, | |
1398 | REMOVE_EMPTY_PARENTS_REFLOG = 0x02 | |
1399 | }; | |
1400 | ||
7bd9bcf3 | 1401 | /* |
a8f0db2d MH |
1402 | * Remove empty parent directories associated with the specified |
1403 | * reference and/or its reflog, but spare [logs/]refs/ and immediate | |
1404 | * subdirs. flags is a combination of REMOVE_EMPTY_PARENTS_REF and/or | |
1405 | * REMOVE_EMPTY_PARENTS_REFLOG. | |
7bd9bcf3 | 1406 | */ |
802de3da NTND |
1407 | static void try_remove_empty_parents(struct files_ref_store *refs, |
1408 | const char *refname, | |
1409 | unsigned int flags) | |
7bd9bcf3 | 1410 | { |
8bdaecb4 | 1411 | struct strbuf buf = STRBUF_INIT; |
e9dcc305 | 1412 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 MH |
1413 | char *p, *q; |
1414 | int i; | |
8bdaecb4 MH |
1415 | |
1416 | strbuf_addstr(&buf, refname); | |
1417 | p = buf.buf; | |
7bd9bcf3 MH |
1418 | for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */ |
1419 | while (*p && *p != '/') | |
1420 | p++; | |
1421 | /* tolerate duplicate slashes; see check_refname_format() */ | |
1422 | while (*p == '/') | |
1423 | p++; | |
1424 | } | |
8bdaecb4 | 1425 | q = buf.buf + buf.len; |
a8f0db2d | 1426 | while (flags & (REMOVE_EMPTY_PARENTS_REF | REMOVE_EMPTY_PARENTS_REFLOG)) { |
7bd9bcf3 MH |
1427 | while (q > p && *q != '/') |
1428 | q--; | |
1429 | while (q > p && *(q-1) == '/') | |
1430 | q--; | |
1431 | if (q == p) | |
1432 | break; | |
8bdaecb4 | 1433 | strbuf_setlen(&buf, q - buf.buf); |
e9dcc305 NTND |
1434 | |
1435 | strbuf_reset(&sb); | |
19e02f4f | 1436 | files_ref_path(refs, &sb, buf.buf); |
e9dcc305 | 1437 | if ((flags & REMOVE_EMPTY_PARENTS_REF) && rmdir(sb.buf)) |
a8f0db2d | 1438 | flags &= ~REMOVE_EMPTY_PARENTS_REF; |
e9dcc305 NTND |
1439 | |
1440 | strbuf_reset(&sb); | |
802de3da | 1441 | files_reflog_path(refs, &sb, buf.buf); |
e9dcc305 | 1442 | if ((flags & REMOVE_EMPTY_PARENTS_REFLOG) && rmdir(sb.buf)) |
a8f0db2d | 1443 | flags &= ~REMOVE_EMPTY_PARENTS_REFLOG; |
7bd9bcf3 | 1444 | } |
8bdaecb4 | 1445 | strbuf_release(&buf); |
e9dcc305 | 1446 | strbuf_release(&sb); |
7bd9bcf3 MH |
1447 | } |
1448 | ||
1449 | /* make sure nobody touched the ref, and unlink */ | |
2f40e954 | 1450 | static void prune_ref(struct files_ref_store *refs, struct ref_to_prune *r) |
7bd9bcf3 MH |
1451 | { |
1452 | struct ref_transaction *transaction; | |
1453 | struct strbuf err = STRBUF_INIT; | |
1454 | ||
1455 | if (check_refname_format(r->name, 0)) | |
1456 | return; | |
1457 | ||
2f40e954 | 1458 | transaction = ref_store_transaction_begin(&refs->base, &err); |
7bd9bcf3 MH |
1459 | if (!transaction || |
1460 | ref_transaction_delete(transaction, r->name, r->sha1, | |
c52ce248 | 1461 | REF_ISPRUNING | REF_NODEREF, NULL, &err) || |
7bd9bcf3 MH |
1462 | ref_transaction_commit(transaction, &err)) { |
1463 | ref_transaction_free(transaction); | |
1464 | error("%s", err.buf); | |
1465 | strbuf_release(&err); | |
1466 | return; | |
1467 | } | |
1468 | ref_transaction_free(transaction); | |
1469 | strbuf_release(&err); | |
7bd9bcf3 MH |
1470 | } |
1471 | ||
2f40e954 | 1472 | static void prune_refs(struct files_ref_store *refs, struct ref_to_prune *r) |
7bd9bcf3 MH |
1473 | { |
1474 | while (r) { | |
2f40e954 | 1475 | prune_ref(refs, r); |
7bd9bcf3 MH |
1476 | r = r->next; |
1477 | } | |
1478 | } | |
1479 | ||
8231527e | 1480 | static int files_pack_refs(struct ref_store *ref_store, unsigned int flags) |
7bd9bcf3 | 1481 | { |
00eebe35 | 1482 | struct files_ref_store *refs = |
9e7ec634 NTND |
1483 | files_downcast(ref_store, REF_STORE_WRITE | REF_STORE_ODB, |
1484 | "pack_refs"); | |
50c2d855 MH |
1485 | struct ref_iterator *iter; |
1486 | struct ref_dir *packed_refs; | |
1487 | int ok; | |
1488 | struct ref_to_prune *refs_to_prune = NULL; | |
7bd9bcf3 | 1489 | |
49c0df6a | 1490 | lock_packed_refs(refs, LOCK_DIE_ON_ERROR); |
50c2d855 MH |
1491 | packed_refs = get_packed_refs(refs); |
1492 | ||
1493 | iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), NULL, 0); | |
1494 | while ((ok = ref_iterator_advance(iter)) == ITER_OK) { | |
1495 | /* | |
1496 | * If the loose reference can be packed, add an entry | |
1497 | * in the packed ref cache. If the reference should be | |
1498 | * pruned, also add it to refs_to_prune. | |
1499 | */ | |
1500 | struct ref_entry *packed_entry; | |
1501 | int is_tag_ref = starts_with(iter->refname, "refs/tags/"); | |
7bd9bcf3 | 1502 | |
50c2d855 MH |
1503 | /* Do not pack per-worktree refs: */ |
1504 | if (ref_type(iter->refname) != REF_TYPE_NORMAL) | |
1505 | continue; | |
1506 | ||
1507 | /* ALWAYS pack tags */ | |
1508 | if (!(flags & PACK_REFS_ALL) && !is_tag_ref) | |
1509 | continue; | |
1510 | ||
1511 | /* Do not pack symbolic or broken refs: */ | |
1512 | if (iter->flags & REF_ISSYMREF) | |
1513 | continue; | |
7bd9bcf3 | 1514 | |
50c2d855 MH |
1515 | if (!ref_resolves_to_object(iter->refname, iter->oid, iter->flags)) |
1516 | continue; | |
1517 | ||
1518 | /* | |
1519 | * Create an entry in the packed-refs cache equivalent | |
1520 | * to the one from the loose ref cache, except that | |
1521 | * we don't copy the peeled status, because we want it | |
1522 | * to be re-peeled. | |
1523 | */ | |
1524 | packed_entry = find_ref_entry(packed_refs, iter->refname); | |
1525 | if (packed_entry) { | |
1526 | /* Overwrite existing packed entry with info from loose entry */ | |
1527 | packed_entry->flag = REF_ISPACKED; | |
1528 | oidcpy(&packed_entry->u.value.oid, iter->oid); | |
1529 | } else { | |
1530 | packed_entry = create_ref_entry(iter->refname, iter->oid->hash, | |
1531 | REF_ISPACKED, 0); | |
1532 | add_ref_entry(packed_refs, packed_entry); | |
1533 | } | |
1534 | oidclr(&packed_entry->u.value.peeled); | |
1535 | ||
1536 | /* Schedule the loose reference for pruning if requested. */ | |
1537 | if ((flags & PACK_REFS_PRUNE)) { | |
1538 | struct ref_to_prune *n; | |
1539 | FLEX_ALLOC_STR(n, name, iter->refname); | |
1540 | hashcpy(n->sha1, iter->oid->hash); | |
1541 | n->next = refs_to_prune; | |
1542 | refs_to_prune = n; | |
1543 | } | |
1544 | } | |
1545 | if (ok != ITER_DONE) | |
1546 | die("error while iterating over references"); | |
7bd9bcf3 | 1547 | |
49c0df6a | 1548 | if (commit_packed_refs(refs)) |
7bd9bcf3 MH |
1549 | die_errno("unable to overwrite old ref-pack file"); |
1550 | ||
50c2d855 | 1551 | prune_refs(refs, refs_to_prune); |
7bd9bcf3 MH |
1552 | return 0; |
1553 | } | |
1554 | ||
1555 | /* | |
1556 | * Rewrite the packed-refs file, omitting any refs listed in | |
1557 | * 'refnames'. On error, leave packed-refs unchanged, write an error | |
1558 | * message to 'err', and return a nonzero value. | |
1559 | * | |
1560 | * The refs in 'refnames' needn't be sorted. `err` must not be NULL. | |
1561 | */ | |
0a95ac5f MH |
1562 | static int repack_without_refs(struct files_ref_store *refs, |
1563 | struct string_list *refnames, struct strbuf *err) | |
7bd9bcf3 MH |
1564 | { |
1565 | struct ref_dir *packed; | |
1566 | struct string_list_item *refname; | |
1567 | int ret, needs_repacking = 0, removed = 0; | |
1568 | ||
32c597e7 | 1569 | files_assert_main_repository(refs, "repack_without_refs"); |
7bd9bcf3 MH |
1570 | assert(err); |
1571 | ||
1572 | /* Look for a packed ref */ | |
1573 | for_each_string_list_item(refname, refnames) { | |
f0d21efc | 1574 | if (get_packed_ref(refs, refname->string)) { |
7bd9bcf3 MH |
1575 | needs_repacking = 1; |
1576 | break; | |
1577 | } | |
1578 | } | |
1579 | ||
1580 | /* Avoid locking if we have nothing to do */ | |
1581 | if (!needs_repacking) | |
1582 | return 0; /* no refname exists in packed refs */ | |
1583 | ||
49c0df6a | 1584 | if (lock_packed_refs(refs, 0)) { |
33dfb9f3 | 1585 | unable_to_lock_message(files_packed_refs_path(refs), errno, err); |
7bd9bcf3 MH |
1586 | return -1; |
1587 | } | |
00eebe35 | 1588 | packed = get_packed_refs(refs); |
7bd9bcf3 MH |
1589 | |
1590 | /* Remove refnames from the cache */ | |
1591 | for_each_string_list_item(refname, refnames) | |
9fc3b063 | 1592 | if (remove_entry_from_dir(packed, refname->string) != -1) |
7bd9bcf3 MH |
1593 | removed = 1; |
1594 | if (!removed) { | |
1595 | /* | |
1596 | * All packed entries disappeared while we were | |
1597 | * acquiring the lock. | |
1598 | */ | |
49c0df6a | 1599 | rollback_packed_refs(refs); |
7bd9bcf3 MH |
1600 | return 0; |
1601 | } | |
1602 | ||
1603 | /* Write what remains */ | |
49c0df6a | 1604 | ret = commit_packed_refs(refs); |
7bd9bcf3 MH |
1605 | if (ret) |
1606 | strbuf_addf(err, "unable to overwrite old ref-pack file: %s", | |
1607 | strerror(errno)); | |
1608 | return ret; | |
1609 | } | |
1610 | ||
a27dcf89 DT |
1611 | static int files_delete_refs(struct ref_store *ref_store, |
1612 | struct string_list *refnames, unsigned int flags) | |
7bd9bcf3 | 1613 | { |
0a95ac5f | 1614 | struct files_ref_store *refs = |
9e7ec634 | 1615 | files_downcast(ref_store, REF_STORE_WRITE, "delete_refs"); |
7bd9bcf3 MH |
1616 | struct strbuf err = STRBUF_INIT; |
1617 | int i, result = 0; | |
1618 | ||
1619 | if (!refnames->nr) | |
1620 | return 0; | |
1621 | ||
0a95ac5f | 1622 | result = repack_without_refs(refs, refnames, &err); |
7bd9bcf3 MH |
1623 | if (result) { |
1624 | /* | |
1625 | * If we failed to rewrite the packed-refs file, then | |
1626 | * it is unsafe to try to remove loose refs, because | |
1627 | * doing so might expose an obsolete packed value for | |
1628 | * a reference that might even point at an object that | |
1629 | * has been garbage collected. | |
1630 | */ | |
1631 | if (refnames->nr == 1) | |
1632 | error(_("could not delete reference %s: %s"), | |
1633 | refnames->items[0].string, err.buf); | |
1634 | else | |
1635 | error(_("could not delete references: %s"), err.buf); | |
1636 | ||
1637 | goto out; | |
1638 | } | |
1639 | ||
1640 | for (i = 0; i < refnames->nr; i++) { | |
1641 | const char *refname = refnames->items[i].string; | |
1642 | ||
2f40e954 | 1643 | if (refs_delete_ref(&refs->base, NULL, refname, NULL, flags)) |
7bd9bcf3 MH |
1644 | result |= error(_("could not remove reference %s"), refname); |
1645 | } | |
1646 | ||
1647 | out: | |
1648 | strbuf_release(&err); | |
1649 | return result; | |
1650 | } | |
1651 | ||
1652 | /* | |
1653 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
1654 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
1655 | * | |
1656 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
1657 | * live into logs/refs. | |
1658 | */ | |
a5c1efd6 | 1659 | #define TMP_RENAMED_LOG "refs/.tmp-renamed-log" |
7bd9bcf3 | 1660 | |
e9dcc305 NTND |
1661 | struct rename_cb { |
1662 | const char *tmp_renamed_log; | |
1663 | int true_errno; | |
1664 | }; | |
1665 | ||
1666 | static int rename_tmp_log_callback(const char *path, void *cb_data) | |
7bd9bcf3 | 1667 | { |
e9dcc305 | 1668 | struct rename_cb *cb = cb_data; |
7bd9bcf3 | 1669 | |
e9dcc305 | 1670 | if (rename(cb->tmp_renamed_log, path)) { |
6a7f3631 MH |
1671 | /* |
1672 | * rename(a, b) when b is an existing directory ought | |
1673 | * to result in ISDIR, but Solaris 5.8 gives ENOTDIR. | |
1674 | * Sheesh. Record the true errno for error reporting, | |
1675 | * but report EISDIR to raceproof_create_file() so | |
1676 | * that it knows to retry. | |
1677 | */ | |
e9dcc305 | 1678 | cb->true_errno = errno; |
6a7f3631 MH |
1679 | if (errno == ENOTDIR) |
1680 | errno = EISDIR; | |
1681 | return -1; | |
1682 | } else { | |
1683 | return 0; | |
7bd9bcf3 | 1684 | } |
6a7f3631 | 1685 | } |
7bd9bcf3 | 1686 | |
802de3da | 1687 | static int rename_tmp_log(struct files_ref_store *refs, const char *newrefname) |
6a7f3631 | 1688 | { |
e9dcc305 NTND |
1689 | struct strbuf path = STRBUF_INIT; |
1690 | struct strbuf tmp = STRBUF_INIT; | |
1691 | struct rename_cb cb; | |
1692 | int ret; | |
6a7f3631 | 1693 | |
802de3da NTND |
1694 | files_reflog_path(refs, &path, newrefname); |
1695 | files_reflog_path(refs, &tmp, TMP_RENAMED_LOG); | |
e9dcc305 NTND |
1696 | cb.tmp_renamed_log = tmp.buf; |
1697 | ret = raceproof_create_file(path.buf, rename_tmp_log_callback, &cb); | |
6a7f3631 MH |
1698 | if (ret) { |
1699 | if (errno == EISDIR) | |
e9dcc305 | 1700 | error("directory not empty: %s", path.buf); |
6a7f3631 | 1701 | else |
990c98d2 | 1702 | error("unable to move logfile %s to %s: %s", |
e9dcc305 NTND |
1703 | tmp.buf, path.buf, |
1704 | strerror(cb.true_errno)); | |
7bd9bcf3 | 1705 | } |
6a7f3631 | 1706 | |
e9dcc305 NTND |
1707 | strbuf_release(&path); |
1708 | strbuf_release(&tmp); | |
7bd9bcf3 MH |
1709 | return ret; |
1710 | } | |
1711 | ||
7bd9bcf3 MH |
1712 | static int write_ref_to_lockfile(struct ref_lock *lock, |
1713 | const unsigned char *sha1, struct strbuf *err); | |
f18a7892 MH |
1714 | static int commit_ref_update(struct files_ref_store *refs, |
1715 | struct ref_lock *lock, | |
7bd9bcf3 | 1716 | const unsigned char *sha1, const char *logmsg, |
5d9b2de4 | 1717 | struct strbuf *err); |
7bd9bcf3 | 1718 | |
9b6b40d9 DT |
1719 | static int files_rename_ref(struct ref_store *ref_store, |
1720 | const char *oldrefname, const char *newrefname, | |
1721 | const char *logmsg) | |
7bd9bcf3 | 1722 | { |
9b6b40d9 | 1723 | struct files_ref_store *refs = |
9e7ec634 | 1724 | files_downcast(ref_store, REF_STORE_WRITE, "rename_ref"); |
7bd9bcf3 MH |
1725 | unsigned char sha1[20], orig_sha1[20]; |
1726 | int flag = 0, logmoved = 0; | |
1727 | struct ref_lock *lock; | |
1728 | struct stat loginfo; | |
e9dcc305 NTND |
1729 | struct strbuf sb_oldref = STRBUF_INIT; |
1730 | struct strbuf sb_newref = STRBUF_INIT; | |
1731 | struct strbuf tmp_renamed_log = STRBUF_INIT; | |
1732 | int log, ret; | |
7bd9bcf3 MH |
1733 | struct strbuf err = STRBUF_INIT; |
1734 | ||
802de3da NTND |
1735 | files_reflog_path(refs, &sb_oldref, oldrefname); |
1736 | files_reflog_path(refs, &sb_newref, newrefname); | |
1737 | files_reflog_path(refs, &tmp_renamed_log, TMP_RENAMED_LOG); | |
e9dcc305 NTND |
1738 | |
1739 | log = !lstat(sb_oldref.buf, &loginfo); | |
0a3f07d6 NTND |
1740 | if (log && S_ISLNK(loginfo.st_mode)) { |
1741 | ret = error("reflog for %s is a symlink", oldrefname); | |
1742 | goto out; | |
1743 | } | |
7bd9bcf3 | 1744 | |
2f40e954 NTND |
1745 | if (!refs_resolve_ref_unsafe(&refs->base, oldrefname, |
1746 | RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE, | |
0a3f07d6 NTND |
1747 | orig_sha1, &flag)) { |
1748 | ret = error("refname %s not found", oldrefname); | |
1749 | goto out; | |
1750 | } | |
e711b1af | 1751 | |
0a3f07d6 NTND |
1752 | if (flag & REF_ISSYMREF) { |
1753 | ret = error("refname %s is a symbolic ref, renaming it is not supported", | |
1754 | oldrefname); | |
1755 | goto out; | |
1756 | } | |
7d2df051 | 1757 | if (!refs_rename_ref_available(&refs->base, oldrefname, newrefname)) { |
0a3f07d6 NTND |
1758 | ret = 1; |
1759 | goto out; | |
1760 | } | |
7bd9bcf3 | 1761 | |
e9dcc305 | 1762 | if (log && rename(sb_oldref.buf, tmp_renamed_log.buf)) { |
a5c1efd6 | 1763 | ret = error("unable to move logfile logs/%s to logs/"TMP_RENAMED_LOG": %s", |
0a3f07d6 NTND |
1764 | oldrefname, strerror(errno)); |
1765 | goto out; | |
1766 | } | |
7bd9bcf3 | 1767 | |
2f40e954 NTND |
1768 | if (refs_delete_ref(&refs->base, logmsg, oldrefname, |
1769 | orig_sha1, REF_NODEREF)) { | |
7bd9bcf3 MH |
1770 | error("unable to delete old %s", oldrefname); |
1771 | goto rollback; | |
1772 | } | |
1773 | ||
12fd3496 DT |
1774 | /* |
1775 | * Since we are doing a shallow lookup, sha1 is not the | |
1776 | * correct value to pass to delete_ref as old_sha1. But that | |
1777 | * doesn't matter, because an old_sha1 check wouldn't add to | |
1778 | * the safety anyway; we want to delete the reference whatever | |
1779 | * its current value. | |
1780 | */ | |
2f40e954 NTND |
1781 | if (!refs_read_ref_full(&refs->base, newrefname, |
1782 | RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE, | |
1783 | sha1, NULL) && | |
1784 | refs_delete_ref(&refs->base, NULL, newrefname, | |
1785 | NULL, REF_NODEREF)) { | |
58364324 | 1786 | if (errno == EISDIR) { |
7bd9bcf3 MH |
1787 | struct strbuf path = STRBUF_INIT; |
1788 | int result; | |
1789 | ||
19e02f4f | 1790 | files_ref_path(refs, &path, newrefname); |
7bd9bcf3 MH |
1791 | result = remove_empty_directories(&path); |
1792 | strbuf_release(&path); | |
1793 | ||
1794 | if (result) { | |
1795 | error("Directory not empty: %s", newrefname); | |
1796 | goto rollback; | |
1797 | } | |
1798 | } else { | |
1799 | error("unable to delete existing %s", newrefname); | |
1800 | goto rollback; | |
1801 | } | |
1802 | } | |
1803 | ||
802de3da | 1804 | if (log && rename_tmp_log(refs, newrefname)) |
7bd9bcf3 MH |
1805 | goto rollback; |
1806 | ||
1807 | logmoved = log; | |
1808 | ||
7eb27cdf MH |
1809 | lock = lock_ref_sha1_basic(refs, newrefname, NULL, NULL, NULL, |
1810 | REF_NODEREF, NULL, &err); | |
7bd9bcf3 MH |
1811 | if (!lock) { |
1812 | error("unable to rename '%s' to '%s': %s", oldrefname, newrefname, err.buf); | |
1813 | strbuf_release(&err); | |
1814 | goto rollback; | |
1815 | } | |
1816 | hashcpy(lock->old_oid.hash, orig_sha1); | |
1817 | ||
1818 | if (write_ref_to_lockfile(lock, orig_sha1, &err) || | |
f18a7892 | 1819 | commit_ref_update(refs, lock, orig_sha1, logmsg, &err)) { |
7bd9bcf3 MH |
1820 | error("unable to write current sha1 into %s: %s", newrefname, err.buf); |
1821 | strbuf_release(&err); | |
1822 | goto rollback; | |
1823 | } | |
1824 | ||
0a3f07d6 NTND |
1825 | ret = 0; |
1826 | goto out; | |
7bd9bcf3 MH |
1827 | |
1828 | rollback: | |
7eb27cdf MH |
1829 | lock = lock_ref_sha1_basic(refs, oldrefname, NULL, NULL, NULL, |
1830 | REF_NODEREF, NULL, &err); | |
7bd9bcf3 MH |
1831 | if (!lock) { |
1832 | error("unable to lock %s for rollback: %s", oldrefname, err.buf); | |
1833 | strbuf_release(&err); | |
1834 | goto rollbacklog; | |
1835 | } | |
1836 | ||
1837 | flag = log_all_ref_updates; | |
341fb286 | 1838 | log_all_ref_updates = LOG_REFS_NONE; |
7bd9bcf3 | 1839 | if (write_ref_to_lockfile(lock, orig_sha1, &err) || |
f18a7892 | 1840 | commit_ref_update(refs, lock, orig_sha1, NULL, &err)) { |
7bd9bcf3 MH |
1841 | error("unable to write current sha1 into %s: %s", oldrefname, err.buf); |
1842 | strbuf_release(&err); | |
1843 | } | |
1844 | log_all_ref_updates = flag; | |
1845 | ||
1846 | rollbacklog: | |
e9dcc305 | 1847 | if (logmoved && rename(sb_newref.buf, sb_oldref.buf)) |
7bd9bcf3 MH |
1848 | error("unable to restore logfile %s from %s: %s", |
1849 | oldrefname, newrefname, strerror(errno)); | |
1850 | if (!logmoved && log && | |
e9dcc305 | 1851 | rename(tmp_renamed_log.buf, sb_oldref.buf)) |
a5c1efd6 | 1852 | error("unable to restore logfile %s from logs/"TMP_RENAMED_LOG": %s", |
7bd9bcf3 | 1853 | oldrefname, strerror(errno)); |
0a3f07d6 NTND |
1854 | ret = 1; |
1855 | out: | |
e9dcc305 NTND |
1856 | strbuf_release(&sb_newref); |
1857 | strbuf_release(&sb_oldref); | |
1858 | strbuf_release(&tmp_renamed_log); | |
1859 | ||
0a3f07d6 | 1860 | return ret; |
7bd9bcf3 MH |
1861 | } |
1862 | ||
1863 | static int close_ref(struct ref_lock *lock) | |
1864 | { | |
1865 | if (close_lock_file(lock->lk)) | |
1866 | return -1; | |
1867 | return 0; | |
1868 | } | |
1869 | ||
1870 | static int commit_ref(struct ref_lock *lock) | |
1871 | { | |
5387c0d8 MH |
1872 | char *path = get_locked_file_path(lock->lk); |
1873 | struct stat st; | |
1874 | ||
1875 | if (!lstat(path, &st) && S_ISDIR(st.st_mode)) { | |
1876 | /* | |
1877 | * There is a directory at the path we want to rename | |
1878 | * the lockfile to. Hopefully it is empty; try to | |
1879 | * delete it. | |
1880 | */ | |
1881 | size_t len = strlen(path); | |
1882 | struct strbuf sb_path = STRBUF_INIT; | |
1883 | ||
1884 | strbuf_attach(&sb_path, path, len, len); | |
1885 | ||
1886 | /* | |
1887 | * If this fails, commit_lock_file() will also fail | |
1888 | * and will report the problem. | |
1889 | */ | |
1890 | remove_empty_directories(&sb_path); | |
1891 | strbuf_release(&sb_path); | |
1892 | } else { | |
1893 | free(path); | |
1894 | } | |
1895 | ||
7bd9bcf3 MH |
1896 | if (commit_lock_file(lock->lk)) |
1897 | return -1; | |
1898 | return 0; | |
1899 | } | |
1900 | ||
1fb0c809 MH |
1901 | static int open_or_create_logfile(const char *path, void *cb) |
1902 | { | |
1903 | int *fd = cb; | |
1904 | ||
1905 | *fd = open(path, O_APPEND | O_WRONLY | O_CREAT, 0666); | |
1906 | return (*fd < 0) ? -1 : 0; | |
1907 | } | |
1908 | ||
7bd9bcf3 | 1909 | /* |
4533e534 MH |
1910 | * Create a reflog for a ref. If force_create = 0, only create the |
1911 | * reflog for certain refs (those for which should_autocreate_reflog | |
1912 | * returns non-zero). Otherwise, create it regardless of the reference | |
1913 | * name. If the logfile already existed or was created, return 0 and | |
1914 | * set *logfd to the file descriptor opened for appending to the file. | |
1915 | * If no logfile exists and we decided not to create one, return 0 and | |
1916 | * set *logfd to -1. On failure, fill in *err, set *logfd to -1, and | |
1917 | * return -1. | |
7bd9bcf3 | 1918 | */ |
802de3da NTND |
1919 | static int log_ref_setup(struct files_ref_store *refs, |
1920 | const char *refname, int force_create, | |
4533e534 | 1921 | int *logfd, struct strbuf *err) |
7bd9bcf3 | 1922 | { |
802de3da NTND |
1923 | struct strbuf logfile_sb = STRBUF_INIT; |
1924 | char *logfile; | |
1925 | ||
1926 | files_reflog_path(refs, &logfile_sb, refname); | |
1927 | logfile = strbuf_detach(&logfile_sb, NULL); | |
7bd9bcf3 | 1928 | |
7bd9bcf3 | 1929 | if (force_create || should_autocreate_reflog(refname)) { |
4533e534 | 1930 | if (raceproof_create_file(logfile, open_or_create_logfile, logfd)) { |
1fb0c809 MH |
1931 | if (errno == ENOENT) |
1932 | strbuf_addf(err, "unable to create directory for '%s': " | |
4533e534 | 1933 | "%s", logfile, strerror(errno)); |
1fb0c809 MH |
1934 | else if (errno == EISDIR) |
1935 | strbuf_addf(err, "there are still logs under '%s'", | |
4533e534 | 1936 | logfile); |
1fb0c809 | 1937 | else |
854bda6b | 1938 | strbuf_addf(err, "unable to append to '%s': %s", |
4533e534 | 1939 | logfile, strerror(errno)); |
7bd9bcf3 | 1940 | |
4533e534 | 1941 | goto error; |
7bd9bcf3 | 1942 | } |
854bda6b | 1943 | } else { |
4533e534 | 1944 | *logfd = open(logfile, O_APPEND | O_WRONLY, 0666); |
e404f459 | 1945 | if (*logfd < 0) { |
854bda6b MH |
1946 | if (errno == ENOENT || errno == EISDIR) { |
1947 | /* | |
1948 | * The logfile doesn't already exist, | |
1949 | * but that is not an error; it only | |
1950 | * means that we won't write log | |
1951 | * entries to it. | |
1952 | */ | |
1953 | ; | |
1954 | } else { | |
1955 | strbuf_addf(err, "unable to append to '%s': %s", | |
4533e534 MH |
1956 | logfile, strerror(errno)); |
1957 | goto error; | |
854bda6b | 1958 | } |
7bd9bcf3 MH |
1959 | } |
1960 | } | |
1961 | ||
e404f459 | 1962 | if (*logfd >= 0) |
4533e534 | 1963 | adjust_shared_perm(logfile); |
854bda6b | 1964 | |
4533e534 | 1965 | free(logfile); |
7bd9bcf3 | 1966 | return 0; |
7bd9bcf3 | 1967 | |
4533e534 MH |
1968 | error: |
1969 | free(logfile); | |
1970 | return -1; | |
7bd9bcf3 | 1971 | } |
7bd9bcf3 | 1972 | |
e3688bd6 DT |
1973 | static int files_create_reflog(struct ref_store *ref_store, |
1974 | const char *refname, int force_create, | |
1975 | struct strbuf *err) | |
7bd9bcf3 | 1976 | { |
802de3da | 1977 | struct files_ref_store *refs = |
9e7ec634 | 1978 | files_downcast(ref_store, REF_STORE_WRITE, "create_reflog"); |
e404f459 | 1979 | int fd; |
7bd9bcf3 | 1980 | |
802de3da | 1981 | if (log_ref_setup(refs, refname, force_create, &fd, err)) |
4533e534 MH |
1982 | return -1; |
1983 | ||
e404f459 MH |
1984 | if (fd >= 0) |
1985 | close(fd); | |
4533e534 MH |
1986 | |
1987 | return 0; | |
7bd9bcf3 MH |
1988 | } |
1989 | ||
1990 | static int log_ref_write_fd(int fd, const unsigned char *old_sha1, | |
1991 | const unsigned char *new_sha1, | |
1992 | const char *committer, const char *msg) | |
1993 | { | |
1994 | int msglen, written; | |
1995 | unsigned maxlen, len; | |
1996 | char *logrec; | |
1997 | ||
1998 | msglen = msg ? strlen(msg) : 0; | |
1999 | maxlen = strlen(committer) + msglen + 100; | |
2000 | logrec = xmalloc(maxlen); | |
2001 | len = xsnprintf(logrec, maxlen, "%s %s %s\n", | |
2002 | sha1_to_hex(old_sha1), | |
2003 | sha1_to_hex(new_sha1), | |
2004 | committer); | |
2005 | if (msglen) | |
2006 | len += copy_reflog_msg(logrec + len - 1, msg) - 1; | |
2007 | ||
2008 | written = len <= maxlen ? write_in_full(fd, logrec, len) : -1; | |
2009 | free(logrec); | |
2010 | if (written != len) | |
2011 | return -1; | |
2012 | ||
2013 | return 0; | |
2014 | } | |
2015 | ||
802de3da NTND |
2016 | static int files_log_ref_write(struct files_ref_store *refs, |
2017 | const char *refname, const unsigned char *old_sha1, | |
11f8457f NTND |
2018 | const unsigned char *new_sha1, const char *msg, |
2019 | int flags, struct strbuf *err) | |
7bd9bcf3 | 2020 | { |
e404f459 | 2021 | int logfd, result; |
7bd9bcf3 | 2022 | |
341fb286 CW |
2023 | if (log_all_ref_updates == LOG_REFS_UNSET) |
2024 | log_all_ref_updates = is_bare_repository() ? LOG_REFS_NONE : LOG_REFS_NORMAL; | |
7bd9bcf3 | 2025 | |
802de3da NTND |
2026 | result = log_ref_setup(refs, refname, |
2027 | flags & REF_FORCE_CREATE_REFLOG, | |
4533e534 | 2028 | &logfd, err); |
7bd9bcf3 MH |
2029 | |
2030 | if (result) | |
2031 | return result; | |
2032 | ||
7bd9bcf3 MH |
2033 | if (logfd < 0) |
2034 | return 0; | |
2035 | result = log_ref_write_fd(logfd, old_sha1, new_sha1, | |
2036 | git_committer_info(0), msg); | |
2037 | if (result) { | |
e9dcc305 | 2038 | struct strbuf sb = STRBUF_INIT; |
87b21e05 MH |
2039 | int save_errno = errno; |
2040 | ||
802de3da | 2041 | files_reflog_path(refs, &sb, refname); |
87b21e05 | 2042 | strbuf_addf(err, "unable to append to '%s': %s", |
e9dcc305 NTND |
2043 | sb.buf, strerror(save_errno)); |
2044 | strbuf_release(&sb); | |
7bd9bcf3 MH |
2045 | close(logfd); |
2046 | return -1; | |
2047 | } | |
2048 | if (close(logfd)) { | |
e9dcc305 | 2049 | struct strbuf sb = STRBUF_INIT; |
87b21e05 MH |
2050 | int save_errno = errno; |
2051 | ||
802de3da | 2052 | files_reflog_path(refs, &sb, refname); |
87b21e05 | 2053 | strbuf_addf(err, "unable to append to '%s': %s", |
e9dcc305 NTND |
2054 | sb.buf, strerror(save_errno)); |
2055 | strbuf_release(&sb); | |
7bd9bcf3 MH |
2056 | return -1; |
2057 | } | |
2058 | return 0; | |
2059 | } | |
2060 | ||
7bd9bcf3 MH |
2061 | /* |
2062 | * Write sha1 into the open lockfile, then close the lockfile. On | |
2063 | * errors, rollback the lockfile, fill in *err and | |
2064 | * return -1. | |
2065 | */ | |
2066 | static int write_ref_to_lockfile(struct ref_lock *lock, | |
2067 | const unsigned char *sha1, struct strbuf *err) | |
2068 | { | |
2069 | static char term = '\n'; | |
2070 | struct object *o; | |
2071 | int fd; | |
2072 | ||
2073 | o = parse_object(sha1); | |
2074 | if (!o) { | |
2075 | strbuf_addf(err, | |
0568c8e9 | 2076 | "trying to write ref '%s' with nonexistent object %s", |
7bd9bcf3 MH |
2077 | lock->ref_name, sha1_to_hex(sha1)); |
2078 | unlock_ref(lock); | |
2079 | return -1; | |
2080 | } | |
2081 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
2082 | strbuf_addf(err, | |
0568c8e9 | 2083 | "trying to write non-commit object %s to branch '%s'", |
7bd9bcf3 MH |
2084 | sha1_to_hex(sha1), lock->ref_name); |
2085 | unlock_ref(lock); | |
2086 | return -1; | |
2087 | } | |
2088 | fd = get_lock_file_fd(lock->lk); | |
2089 | if (write_in_full(fd, sha1_to_hex(sha1), 40) != 40 || | |
2090 | write_in_full(fd, &term, 1) != 1 || | |
2091 | close_ref(lock) < 0) { | |
2092 | strbuf_addf(err, | |
0568c8e9 | 2093 | "couldn't write '%s'", get_lock_file_path(lock->lk)); |
7bd9bcf3 MH |
2094 | unlock_ref(lock); |
2095 | return -1; | |
2096 | } | |
2097 | return 0; | |
2098 | } | |
2099 | ||
2100 | /* | |
2101 | * Commit a change to a loose reference that has already been written | |
2102 | * to the loose reference lockfile. Also update the reflogs if | |
2103 | * necessary, using the specified lockmsg (which can be NULL). | |
2104 | */ | |
f18a7892 MH |
2105 | static int commit_ref_update(struct files_ref_store *refs, |
2106 | struct ref_lock *lock, | |
7bd9bcf3 | 2107 | const unsigned char *sha1, const char *logmsg, |
5d9b2de4 | 2108 | struct strbuf *err) |
7bd9bcf3 | 2109 | { |
32c597e7 | 2110 | files_assert_main_repository(refs, "commit_ref_update"); |
00eebe35 MH |
2111 | |
2112 | clear_loose_ref_cache(refs); | |
802de3da NTND |
2113 | if (files_log_ref_write(refs, lock->ref_name, |
2114 | lock->old_oid.hash, sha1, | |
81b1b6d4 | 2115 | logmsg, 0, err)) { |
7bd9bcf3 | 2116 | char *old_msg = strbuf_detach(err, NULL); |
0568c8e9 | 2117 | strbuf_addf(err, "cannot update the ref '%s': %s", |
7bd9bcf3 MH |
2118 | lock->ref_name, old_msg); |
2119 | free(old_msg); | |
2120 | unlock_ref(lock); | |
2121 | return -1; | |
2122 | } | |
7a418f3a MH |
2123 | |
2124 | if (strcmp(lock->ref_name, "HEAD") != 0) { | |
7bd9bcf3 MH |
2125 | /* |
2126 | * Special hack: If a branch is updated directly and HEAD | |
2127 | * points to it (may happen on the remote side of a push | |
2128 | * for example) then logically the HEAD reflog should be | |
2129 | * updated too. | |
2130 | * A generic solution implies reverse symref information, | |
2131 | * but finding all symrefs pointing to the given branch | |
2132 | * would be rather costly for this rare event (the direct | |
2133 | * update of a branch) to be worth it. So let's cheat and | |
2134 | * check with HEAD only which should cover 99% of all usage | |
2135 | * scenarios (even 100% of the default ones). | |
2136 | */ | |
2137 | unsigned char head_sha1[20]; | |
2138 | int head_flag; | |
2139 | const char *head_ref; | |
7a418f3a | 2140 | |
2f40e954 NTND |
2141 | head_ref = refs_resolve_ref_unsafe(&refs->base, "HEAD", |
2142 | RESOLVE_REF_READING, | |
2143 | head_sha1, &head_flag); | |
7bd9bcf3 MH |
2144 | if (head_ref && (head_flag & REF_ISSYMREF) && |
2145 | !strcmp(head_ref, lock->ref_name)) { | |
2146 | struct strbuf log_err = STRBUF_INIT; | |
802de3da NTND |
2147 | if (files_log_ref_write(refs, "HEAD", |
2148 | lock->old_oid.hash, sha1, | |
2149 | logmsg, 0, &log_err)) { | |
7bd9bcf3 MH |
2150 | error("%s", log_err.buf); |
2151 | strbuf_release(&log_err); | |
2152 | } | |
2153 | } | |
2154 | } | |
7a418f3a | 2155 | |
7bd9bcf3 | 2156 | if (commit_ref(lock)) { |
0568c8e9 | 2157 | strbuf_addf(err, "couldn't set '%s'", lock->ref_name); |
7bd9bcf3 MH |
2158 | unlock_ref(lock); |
2159 | return -1; | |
2160 | } | |
2161 | ||
2162 | unlock_ref(lock); | |
2163 | return 0; | |
2164 | } | |
2165 | ||
370e5ad6 | 2166 | static int create_ref_symlink(struct ref_lock *lock, const char *target) |
7bd9bcf3 | 2167 | { |
370e5ad6 | 2168 | int ret = -1; |
7bd9bcf3 | 2169 | #ifndef NO_SYMLINK_HEAD |
370e5ad6 JK |
2170 | char *ref_path = get_locked_file_path(lock->lk); |
2171 | unlink(ref_path); | |
2172 | ret = symlink(target, ref_path); | |
2173 | free(ref_path); | |
2174 | ||
2175 | if (ret) | |
7bd9bcf3 | 2176 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
7bd9bcf3 | 2177 | #endif |
370e5ad6 JK |
2178 | return ret; |
2179 | } | |
7bd9bcf3 | 2180 | |
802de3da NTND |
2181 | static void update_symref_reflog(struct files_ref_store *refs, |
2182 | struct ref_lock *lock, const char *refname, | |
370e5ad6 JK |
2183 | const char *target, const char *logmsg) |
2184 | { | |
2185 | struct strbuf err = STRBUF_INIT; | |
2186 | unsigned char new_sha1[20]; | |
2f40e954 NTND |
2187 | if (logmsg && |
2188 | !refs_read_ref_full(&refs->base, target, | |
2189 | RESOLVE_REF_READING, new_sha1, NULL) && | |
802de3da NTND |
2190 | files_log_ref_write(refs, refname, lock->old_oid.hash, |
2191 | new_sha1, logmsg, 0, &err)) { | |
7bd9bcf3 MH |
2192 | error("%s", err.buf); |
2193 | strbuf_release(&err); | |
2194 | } | |
370e5ad6 | 2195 | } |
7bd9bcf3 | 2196 | |
802de3da NTND |
2197 | static int create_symref_locked(struct files_ref_store *refs, |
2198 | struct ref_lock *lock, const char *refname, | |
370e5ad6 JK |
2199 | const char *target, const char *logmsg) |
2200 | { | |
2201 | if (prefer_symlink_refs && !create_ref_symlink(lock, target)) { | |
802de3da | 2202 | update_symref_reflog(refs, lock, refname, target, logmsg); |
370e5ad6 JK |
2203 | return 0; |
2204 | } | |
2205 | ||
2206 | if (!fdopen_lock_file(lock->lk, "w")) | |
2207 | return error("unable to fdopen %s: %s", | |
2208 | lock->lk->tempfile.filename.buf, strerror(errno)); | |
2209 | ||
802de3da | 2210 | update_symref_reflog(refs, lock, refname, target, logmsg); |
396da8f7 | 2211 | |
370e5ad6 JK |
2212 | /* no error check; commit_ref will check ferror */ |
2213 | fprintf(lock->lk->tempfile.fp, "ref: %s\n", target); | |
2214 | if (commit_ref(lock) < 0) | |
2215 | return error("unable to write symref for %s: %s", refname, | |
2216 | strerror(errno)); | |
7bd9bcf3 MH |
2217 | return 0; |
2218 | } | |
2219 | ||
284689ba MH |
2220 | static int files_create_symref(struct ref_store *ref_store, |
2221 | const char *refname, const char *target, | |
2222 | const char *logmsg) | |
370e5ad6 | 2223 | { |
7eb27cdf | 2224 | struct files_ref_store *refs = |
9e7ec634 | 2225 | files_downcast(ref_store, REF_STORE_WRITE, "create_symref"); |
370e5ad6 JK |
2226 | struct strbuf err = STRBUF_INIT; |
2227 | struct ref_lock *lock; | |
2228 | int ret; | |
2229 | ||
7eb27cdf MH |
2230 | lock = lock_ref_sha1_basic(refs, refname, NULL, |
2231 | NULL, NULL, REF_NODEREF, NULL, | |
370e5ad6 JK |
2232 | &err); |
2233 | if (!lock) { | |
2234 | error("%s", err.buf); | |
2235 | strbuf_release(&err); | |
2236 | return -1; | |
2237 | } | |
2238 | ||
802de3da | 2239 | ret = create_symref_locked(refs, lock, refname, target, logmsg); |
370e5ad6 JK |
2240 | unlock_ref(lock); |
2241 | return ret; | |
2242 | } | |
2243 | ||
39ee4c6c | 2244 | int set_worktree_head_symref(const char *gitdir, const char *target, const char *logmsg) |
2233066e | 2245 | { |
802de3da NTND |
2246 | /* |
2247 | * FIXME: this obviously will not work well for future refs | |
2248 | * backends. This function needs to die. | |
2249 | */ | |
2250 | struct files_ref_store *refs = | |
9e7ec634 NTND |
2251 | files_downcast(get_main_ref_store(), |
2252 | REF_STORE_WRITE, | |
2253 | "set_head_symref"); | |
802de3da | 2254 | |
2233066e KY |
2255 | static struct lock_file head_lock; |
2256 | struct ref_lock *lock; | |
2233066e KY |
2257 | struct strbuf head_path = STRBUF_INIT; |
2258 | const char *head_rel; | |
2259 | int ret; | |
2260 | ||
2261 | strbuf_addf(&head_path, "%s/HEAD", absolute_path(gitdir)); | |
2262 | if (hold_lock_file_for_update(&head_lock, head_path.buf, | |
2263 | LOCK_NO_DEREF) < 0) { | |
18eb3a9c KY |
2264 | struct strbuf err = STRBUF_INIT; |
2265 | unable_to_lock_message(head_path.buf, errno, &err); | |
2233066e KY |
2266 | error("%s", err.buf); |
2267 | strbuf_release(&err); | |
2268 | strbuf_release(&head_path); | |
2269 | return -1; | |
2270 | } | |
2271 | ||
2272 | /* head_rel will be "HEAD" for the main tree, "worktrees/wt/HEAD" for | |
2273 | linked trees */ | |
2274 | head_rel = remove_leading_path(head_path.buf, | |
2275 | absolute_path(get_git_common_dir())); | |
2276 | /* to make use of create_symref_locked(), initialize ref_lock */ | |
2277 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
2278 | lock->lk = &head_lock; | |
2279 | lock->ref_name = xstrdup(head_rel); | |
2233066e | 2280 | |
802de3da | 2281 | ret = create_symref_locked(refs, lock, head_rel, target, logmsg); |
2233066e KY |
2282 | |
2283 | unlock_ref(lock); /* will free lock */ | |
2284 | strbuf_release(&head_path); | |
2285 | return ret; | |
2286 | } | |
2287 | ||
e3688bd6 DT |
2288 | static int files_reflog_exists(struct ref_store *ref_store, |
2289 | const char *refname) | |
7bd9bcf3 | 2290 | { |
802de3da | 2291 | struct files_ref_store *refs = |
9e7ec634 | 2292 | files_downcast(ref_store, REF_STORE_READ, "reflog_exists"); |
e9dcc305 | 2293 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 | 2294 | struct stat st; |
e9dcc305 | 2295 | int ret; |
7bd9bcf3 | 2296 | |
802de3da | 2297 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
2298 | ret = !lstat(sb.buf, &st) && S_ISREG(st.st_mode); |
2299 | strbuf_release(&sb); | |
2300 | return ret; | |
7bd9bcf3 MH |
2301 | } |
2302 | ||
e3688bd6 DT |
2303 | static int files_delete_reflog(struct ref_store *ref_store, |
2304 | const char *refname) | |
7bd9bcf3 | 2305 | { |
802de3da | 2306 | struct files_ref_store *refs = |
9e7ec634 | 2307 | files_downcast(ref_store, REF_STORE_WRITE, "delete_reflog"); |
e9dcc305 NTND |
2308 | struct strbuf sb = STRBUF_INIT; |
2309 | int ret; | |
2310 | ||
802de3da | 2311 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
2312 | ret = remove_path(sb.buf); |
2313 | strbuf_release(&sb); | |
2314 | return ret; | |
7bd9bcf3 MH |
2315 | } |
2316 | ||
2317 | static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data) | |
2318 | { | |
9461d272 | 2319 | struct object_id ooid, noid; |
7bd9bcf3 MH |
2320 | char *email_end, *message; |
2321 | unsigned long timestamp; | |
2322 | int tz; | |
43bc3b6c | 2323 | const char *p = sb->buf; |
7bd9bcf3 MH |
2324 | |
2325 | /* old SP new SP name <email> SP time TAB msg LF */ | |
43bc3b6c | 2326 | if (!sb->len || sb->buf[sb->len - 1] != '\n' || |
2327 | parse_oid_hex(p, &ooid, &p) || *p++ != ' ' || | |
2328 | parse_oid_hex(p, &noid, &p) || *p++ != ' ' || | |
2329 | !(email_end = strchr(p, '>')) || | |
7bd9bcf3 MH |
2330 | email_end[1] != ' ' || |
2331 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
2332 | !message || message[0] != ' ' || | |
2333 | (message[1] != '+' && message[1] != '-') || | |
2334 | !isdigit(message[2]) || !isdigit(message[3]) || | |
2335 | !isdigit(message[4]) || !isdigit(message[5])) | |
2336 | return 0; /* corrupt? */ | |
2337 | email_end[1] = '\0'; | |
2338 | tz = strtol(message + 1, NULL, 10); | |
2339 | if (message[6] != '\t') | |
2340 | message += 6; | |
2341 | else | |
2342 | message += 7; | |
43bc3b6c | 2343 | return fn(&ooid, &noid, p, timestamp, tz, message, cb_data); |
7bd9bcf3 MH |
2344 | } |
2345 | ||
2346 | static char *find_beginning_of_line(char *bob, char *scan) | |
2347 | { | |
2348 | while (bob < scan && *(--scan) != '\n') | |
2349 | ; /* keep scanning backwards */ | |
2350 | /* | |
2351 | * Return either beginning of the buffer, or LF at the end of | |
2352 | * the previous line. | |
2353 | */ | |
2354 | return scan; | |
2355 | } | |
2356 | ||
e3688bd6 DT |
2357 | static int files_for_each_reflog_ent_reverse(struct ref_store *ref_store, |
2358 | const char *refname, | |
2359 | each_reflog_ent_fn fn, | |
2360 | void *cb_data) | |
7bd9bcf3 | 2361 | { |
802de3da | 2362 | struct files_ref_store *refs = |
9e7ec634 NTND |
2363 | files_downcast(ref_store, REF_STORE_READ, |
2364 | "for_each_reflog_ent_reverse"); | |
7bd9bcf3 MH |
2365 | struct strbuf sb = STRBUF_INIT; |
2366 | FILE *logfp; | |
2367 | long pos; | |
2368 | int ret = 0, at_tail = 1; | |
2369 | ||
802de3da | 2370 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
2371 | logfp = fopen(sb.buf, "r"); |
2372 | strbuf_release(&sb); | |
7bd9bcf3 MH |
2373 | if (!logfp) |
2374 | return -1; | |
2375 | ||
2376 | /* Jump to the end */ | |
2377 | if (fseek(logfp, 0, SEEK_END) < 0) | |
be686f03 RS |
2378 | ret = error("cannot seek back reflog for %s: %s", |
2379 | refname, strerror(errno)); | |
7bd9bcf3 MH |
2380 | pos = ftell(logfp); |
2381 | while (!ret && 0 < pos) { | |
2382 | int cnt; | |
2383 | size_t nread; | |
2384 | char buf[BUFSIZ]; | |
2385 | char *endp, *scanp; | |
2386 | ||
2387 | /* Fill next block from the end */ | |
2388 | cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos; | |
be686f03 RS |
2389 | if (fseek(logfp, pos - cnt, SEEK_SET)) { |
2390 | ret = error("cannot seek back reflog for %s: %s", | |
2391 | refname, strerror(errno)); | |
2392 | break; | |
2393 | } | |
7bd9bcf3 | 2394 | nread = fread(buf, cnt, 1, logfp); |
be686f03 RS |
2395 | if (nread != 1) { |
2396 | ret = error("cannot read %d bytes from reflog for %s: %s", | |
2397 | cnt, refname, strerror(errno)); | |
2398 | break; | |
2399 | } | |
7bd9bcf3 MH |
2400 | pos -= cnt; |
2401 | ||
2402 | scanp = endp = buf + cnt; | |
2403 | if (at_tail && scanp[-1] == '\n') | |
2404 | /* Looking at the final LF at the end of the file */ | |
2405 | scanp--; | |
2406 | at_tail = 0; | |
2407 | ||
2408 | while (buf < scanp) { | |
2409 | /* | |
2410 | * terminating LF of the previous line, or the beginning | |
2411 | * of the buffer. | |
2412 | */ | |
2413 | char *bp; | |
2414 | ||
2415 | bp = find_beginning_of_line(buf, scanp); | |
2416 | ||
2417 | if (*bp == '\n') { | |
2418 | /* | |
2419 | * The newline is the end of the previous line, | |
2420 | * so we know we have complete line starting | |
2421 | * at (bp + 1). Prefix it onto any prior data | |
2422 | * we collected for the line and process it. | |
2423 | */ | |
2424 | strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1)); | |
2425 | scanp = bp; | |
2426 | endp = bp + 1; | |
2427 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
2428 | strbuf_reset(&sb); | |
2429 | if (ret) | |
2430 | break; | |
2431 | } else if (!pos) { | |
2432 | /* | |
2433 | * We are at the start of the buffer, and the | |
2434 | * start of the file; there is no previous | |
2435 | * line, and we have everything for this one. | |
2436 | * Process it, and we can end the loop. | |
2437 | */ | |
2438 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
2439 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
2440 | strbuf_reset(&sb); | |
2441 | break; | |
2442 | } | |
2443 | ||
2444 | if (bp == buf) { | |
2445 | /* | |
2446 | * We are at the start of the buffer, and there | |
2447 | * is more file to read backwards. Which means | |
2448 | * we are in the middle of a line. Note that we | |
2449 | * may get here even if *bp was a newline; that | |
2450 | * just means we are at the exact end of the | |
2451 | * previous line, rather than some spot in the | |
2452 | * middle. | |
2453 | * | |
2454 | * Save away what we have to be combined with | |
2455 | * the data from the next read. | |
2456 | */ | |
2457 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
2458 | break; | |
2459 | } | |
2460 | } | |
2461 | ||
2462 | } | |
2463 | if (!ret && sb.len) | |
2464 | die("BUG: reverse reflog parser had leftover data"); | |
2465 | ||
2466 | fclose(logfp); | |
2467 | strbuf_release(&sb); | |
2468 | return ret; | |
2469 | } | |
2470 | ||
e3688bd6 DT |
2471 | static int files_for_each_reflog_ent(struct ref_store *ref_store, |
2472 | const char *refname, | |
2473 | each_reflog_ent_fn fn, void *cb_data) | |
7bd9bcf3 | 2474 | { |
802de3da | 2475 | struct files_ref_store *refs = |
9e7ec634 NTND |
2476 | files_downcast(ref_store, REF_STORE_READ, |
2477 | "for_each_reflog_ent"); | |
7bd9bcf3 MH |
2478 | FILE *logfp; |
2479 | struct strbuf sb = STRBUF_INIT; | |
2480 | int ret = 0; | |
2481 | ||
802de3da | 2482 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
2483 | logfp = fopen(sb.buf, "r"); |
2484 | strbuf_release(&sb); | |
7bd9bcf3 MH |
2485 | if (!logfp) |
2486 | return -1; | |
2487 | ||
2488 | while (!ret && !strbuf_getwholeline(&sb, logfp, '\n')) | |
2489 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
2490 | fclose(logfp); | |
2491 | strbuf_release(&sb); | |
2492 | return ret; | |
2493 | } | |
7bd9bcf3 | 2494 | |
2880d16f MH |
2495 | struct files_reflog_iterator { |
2496 | struct ref_iterator base; | |
7bd9bcf3 | 2497 | |
2f40e954 | 2498 | struct ref_store *ref_store; |
2880d16f MH |
2499 | struct dir_iterator *dir_iterator; |
2500 | struct object_id oid; | |
2501 | }; | |
7bd9bcf3 | 2502 | |
2880d16f MH |
2503 | static int files_reflog_iterator_advance(struct ref_iterator *ref_iterator) |
2504 | { | |
2505 | struct files_reflog_iterator *iter = | |
2506 | (struct files_reflog_iterator *)ref_iterator; | |
2507 | struct dir_iterator *diter = iter->dir_iterator; | |
2508 | int ok; | |
2509 | ||
2510 | while ((ok = dir_iterator_advance(diter)) == ITER_OK) { | |
2511 | int flags; | |
2512 | ||
2513 | if (!S_ISREG(diter->st.st_mode)) | |
7bd9bcf3 | 2514 | continue; |
2880d16f MH |
2515 | if (diter->basename[0] == '.') |
2516 | continue; | |
2517 | if (ends_with(diter->basename, ".lock")) | |
7bd9bcf3 | 2518 | continue; |
7bd9bcf3 | 2519 | |
2f40e954 NTND |
2520 | if (refs_read_ref_full(iter->ref_store, |
2521 | diter->relative_path, 0, | |
2522 | iter->oid.hash, &flags)) { | |
2880d16f MH |
2523 | error("bad ref for %s", diter->path.buf); |
2524 | continue; | |
7bd9bcf3 | 2525 | } |
2880d16f MH |
2526 | |
2527 | iter->base.refname = diter->relative_path; | |
2528 | iter->base.oid = &iter->oid; | |
2529 | iter->base.flags = flags; | |
2530 | return ITER_OK; | |
7bd9bcf3 | 2531 | } |
2880d16f MH |
2532 | |
2533 | iter->dir_iterator = NULL; | |
2534 | if (ref_iterator_abort(ref_iterator) == ITER_ERROR) | |
2535 | ok = ITER_ERROR; | |
2536 | return ok; | |
2537 | } | |
2538 | ||
2539 | static int files_reflog_iterator_peel(struct ref_iterator *ref_iterator, | |
2540 | struct object_id *peeled) | |
2541 | { | |
2542 | die("BUG: ref_iterator_peel() called for reflog_iterator"); | |
2543 | } | |
2544 | ||
2545 | static int files_reflog_iterator_abort(struct ref_iterator *ref_iterator) | |
2546 | { | |
2547 | struct files_reflog_iterator *iter = | |
2548 | (struct files_reflog_iterator *)ref_iterator; | |
2549 | int ok = ITER_DONE; | |
2550 | ||
2551 | if (iter->dir_iterator) | |
2552 | ok = dir_iterator_abort(iter->dir_iterator); | |
2553 | ||
2554 | base_ref_iterator_free(ref_iterator); | |
2555 | return ok; | |
2556 | } | |
2557 | ||
2558 | static struct ref_iterator_vtable files_reflog_iterator_vtable = { | |
2559 | files_reflog_iterator_advance, | |
2560 | files_reflog_iterator_peel, | |
2561 | files_reflog_iterator_abort | |
2562 | }; | |
2563 | ||
e3688bd6 | 2564 | static struct ref_iterator *files_reflog_iterator_begin(struct ref_store *ref_store) |
2880d16f | 2565 | { |
802de3da | 2566 | struct files_ref_store *refs = |
9e7ec634 NTND |
2567 | files_downcast(ref_store, REF_STORE_READ, |
2568 | "reflog_iterator_begin"); | |
2880d16f MH |
2569 | struct files_reflog_iterator *iter = xcalloc(1, sizeof(*iter)); |
2570 | struct ref_iterator *ref_iterator = &iter->base; | |
e9dcc305 | 2571 | struct strbuf sb = STRBUF_INIT; |
2880d16f MH |
2572 | |
2573 | base_ref_iterator_init(ref_iterator, &files_reflog_iterator_vtable); | |
802de3da | 2574 | files_reflog_path(refs, &sb, NULL); |
e9dcc305 | 2575 | iter->dir_iterator = dir_iterator_begin(sb.buf); |
2f40e954 | 2576 | iter->ref_store = ref_store; |
e9dcc305 | 2577 | strbuf_release(&sb); |
2880d16f | 2578 | return ref_iterator; |
7bd9bcf3 MH |
2579 | } |
2580 | ||
7bd9bcf3 MH |
2581 | static int ref_update_reject_duplicates(struct string_list *refnames, |
2582 | struct strbuf *err) | |
2583 | { | |
2584 | int i, n = refnames->nr; | |
2585 | ||
2586 | assert(err); | |
2587 | ||
2588 | for (i = 1; i < n; i++) | |
2589 | if (!strcmp(refnames->items[i - 1].string, refnames->items[i].string)) { | |
2590 | strbuf_addf(err, | |
0568c8e9 | 2591 | "multiple updates for ref '%s' not allowed.", |
7bd9bcf3 MH |
2592 | refnames->items[i].string); |
2593 | return 1; | |
2594 | } | |
2595 | return 0; | |
2596 | } | |
2597 | ||
165056b2 | 2598 | /* |
92b1551b MH |
2599 | * If update is a direct update of head_ref (the reference pointed to |
2600 | * by HEAD), then add an extra REF_LOG_ONLY update for HEAD. | |
2601 | */ | |
2602 | static int split_head_update(struct ref_update *update, | |
2603 | struct ref_transaction *transaction, | |
2604 | const char *head_ref, | |
2605 | struct string_list *affected_refnames, | |
2606 | struct strbuf *err) | |
2607 | { | |
2608 | struct string_list_item *item; | |
2609 | struct ref_update *new_update; | |
2610 | ||
2611 | if ((update->flags & REF_LOG_ONLY) || | |
2612 | (update->flags & REF_ISPRUNING) || | |
2613 | (update->flags & REF_UPDATE_VIA_HEAD)) | |
2614 | return 0; | |
2615 | ||
2616 | if (strcmp(update->refname, head_ref)) | |
2617 | return 0; | |
2618 | ||
2619 | /* | |
2620 | * First make sure that HEAD is not already in the | |
2621 | * transaction. This insertion is O(N) in the transaction | |
2622 | * size, but it happens at most once per transaction. | |
2623 | */ | |
2624 | item = string_list_insert(affected_refnames, "HEAD"); | |
2625 | if (item->util) { | |
2626 | /* An entry already existed */ | |
2627 | strbuf_addf(err, | |
2628 | "multiple updates for 'HEAD' (including one " | |
2629 | "via its referent '%s') are not allowed", | |
2630 | update->refname); | |
2631 | return TRANSACTION_NAME_CONFLICT; | |
2632 | } | |
2633 | ||
2634 | new_update = ref_transaction_add_update( | |
2635 | transaction, "HEAD", | |
2636 | update->flags | REF_LOG_ONLY | REF_NODEREF, | |
2637 | update->new_sha1, update->old_sha1, | |
2638 | update->msg); | |
2639 | ||
2640 | item->util = new_update; | |
2641 | ||
2642 | return 0; | |
2643 | } | |
2644 | ||
2645 | /* | |
2646 | * update is for a symref that points at referent and doesn't have | |
2647 | * REF_NODEREF set. Split it into two updates: | |
2648 | * - The original update, but with REF_LOG_ONLY and REF_NODEREF set | |
2649 | * - A new, separate update for the referent reference | |
2650 | * Note that the new update will itself be subject to splitting when | |
2651 | * the iteration gets to it. | |
2652 | */ | |
fcc42ea0 MH |
2653 | static int split_symref_update(struct files_ref_store *refs, |
2654 | struct ref_update *update, | |
92b1551b MH |
2655 | const char *referent, |
2656 | struct ref_transaction *transaction, | |
2657 | struct string_list *affected_refnames, | |
2658 | struct strbuf *err) | |
2659 | { | |
2660 | struct string_list_item *item; | |
2661 | struct ref_update *new_update; | |
2662 | unsigned int new_flags; | |
2663 | ||
2664 | /* | |
2665 | * First make sure that referent is not already in the | |
2666 | * transaction. This insertion is O(N) in the transaction | |
2667 | * size, but it happens at most once per symref in a | |
2668 | * transaction. | |
2669 | */ | |
2670 | item = string_list_insert(affected_refnames, referent); | |
2671 | if (item->util) { | |
2672 | /* An entry already existed */ | |
2673 | strbuf_addf(err, | |
2674 | "multiple updates for '%s' (including one " | |
2675 | "via symref '%s') are not allowed", | |
2676 | referent, update->refname); | |
2677 | return TRANSACTION_NAME_CONFLICT; | |
2678 | } | |
2679 | ||
2680 | new_flags = update->flags; | |
2681 | if (!strcmp(update->refname, "HEAD")) { | |
2682 | /* | |
2683 | * Record that the new update came via HEAD, so that | |
2684 | * when we process it, split_head_update() doesn't try | |
2685 | * to add another reflog update for HEAD. Note that | |
2686 | * this bit will be propagated if the new_update | |
2687 | * itself needs to be split. | |
2688 | */ | |
2689 | new_flags |= REF_UPDATE_VIA_HEAD; | |
2690 | } | |
2691 | ||
2692 | new_update = ref_transaction_add_update( | |
2693 | transaction, referent, new_flags, | |
2694 | update->new_sha1, update->old_sha1, | |
2695 | update->msg); | |
2696 | ||
6e30b2f6 MH |
2697 | new_update->parent_update = update; |
2698 | ||
2699 | /* | |
2700 | * Change the symbolic ref update to log only. Also, it | |
2701 | * doesn't need to check its old SHA-1 value, as that will be | |
2702 | * done when new_update is processed. | |
2703 | */ | |
92b1551b | 2704 | update->flags |= REF_LOG_ONLY | REF_NODEREF; |
6e30b2f6 | 2705 | update->flags &= ~REF_HAVE_OLD; |
92b1551b MH |
2706 | |
2707 | item->util = new_update; | |
2708 | ||
2709 | return 0; | |
2710 | } | |
2711 | ||
6e30b2f6 MH |
2712 | /* |
2713 | * Return the refname under which update was originally requested. | |
2714 | */ | |
2715 | static const char *original_update_refname(struct ref_update *update) | |
2716 | { | |
2717 | while (update->parent_update) | |
2718 | update = update->parent_update; | |
2719 | ||
2720 | return update->refname; | |
2721 | } | |
2722 | ||
e3f51039 MH |
2723 | /* |
2724 | * Check whether the REF_HAVE_OLD and old_oid values stored in update | |
2725 | * are consistent with oid, which is the reference's current value. If | |
2726 | * everything is OK, return 0; otherwise, write an error message to | |
2727 | * err and return -1. | |
2728 | */ | |
2729 | static int check_old_oid(struct ref_update *update, struct object_id *oid, | |
2730 | struct strbuf *err) | |
2731 | { | |
2732 | if (!(update->flags & REF_HAVE_OLD) || | |
2733 | !hashcmp(oid->hash, update->old_sha1)) | |
2734 | return 0; | |
2735 | ||
2736 | if (is_null_sha1(update->old_sha1)) | |
2737 | strbuf_addf(err, "cannot lock ref '%s': " | |
2738 | "reference already exists", | |
2739 | original_update_refname(update)); | |
2740 | else if (is_null_oid(oid)) | |
2741 | strbuf_addf(err, "cannot lock ref '%s': " | |
2742 | "reference is missing but expected %s", | |
2743 | original_update_refname(update), | |
2744 | sha1_to_hex(update->old_sha1)); | |
2745 | else | |
2746 | strbuf_addf(err, "cannot lock ref '%s': " | |
2747 | "is at %s but expected %s", | |
2748 | original_update_refname(update), | |
2749 | oid_to_hex(oid), | |
2750 | sha1_to_hex(update->old_sha1)); | |
2751 | ||
2752 | return -1; | |
2753 | } | |
2754 | ||
92b1551b MH |
2755 | /* |
2756 | * Prepare for carrying out update: | |
2757 | * - Lock the reference referred to by update. | |
2758 | * - Read the reference under lock. | |
2759 | * - Check that its old SHA-1 value (if specified) is correct, and in | |
2760 | * any case record it in update->lock->old_oid for later use when | |
2761 | * writing the reflog. | |
2762 | * - If it is a symref update without REF_NODEREF, split it up into a | |
2763 | * REF_LOG_ONLY update of the symref and add a separate update for | |
2764 | * the referent to transaction. | |
2765 | * - If it is an update of head_ref, add a corresponding REF_LOG_ONLY | |
2766 | * update of HEAD. | |
165056b2 | 2767 | */ |
b3bbbc5c MH |
2768 | static int lock_ref_for_update(struct files_ref_store *refs, |
2769 | struct ref_update *update, | |
165056b2 | 2770 | struct ref_transaction *transaction, |
92b1551b | 2771 | const char *head_ref, |
165056b2 MH |
2772 | struct string_list *affected_refnames, |
2773 | struct strbuf *err) | |
2774 | { | |
92b1551b MH |
2775 | struct strbuf referent = STRBUF_INIT; |
2776 | int mustexist = (update->flags & REF_HAVE_OLD) && | |
2777 | !is_null_sha1(update->old_sha1); | |
165056b2 | 2778 | int ret; |
92b1551b | 2779 | struct ref_lock *lock; |
165056b2 | 2780 | |
32c597e7 | 2781 | files_assert_main_repository(refs, "lock_ref_for_update"); |
b3bbbc5c | 2782 | |
92b1551b | 2783 | if ((update->flags & REF_HAVE_NEW) && is_null_sha1(update->new_sha1)) |
165056b2 | 2784 | update->flags |= REF_DELETING; |
92b1551b MH |
2785 | |
2786 | if (head_ref) { | |
2787 | ret = split_head_update(update, transaction, head_ref, | |
2788 | affected_refnames, err); | |
2789 | if (ret) | |
2790 | return ret; | |
2791 | } | |
2792 | ||
f7b0a987 | 2793 | ret = lock_raw_ref(refs, update->refname, mustexist, |
92b1551b | 2794 | affected_refnames, NULL, |
7d618264 | 2795 | &lock, &referent, |
92b1551b | 2796 | &update->type, err); |
92b1551b | 2797 | if (ret) { |
165056b2 MH |
2798 | char *reason; |
2799 | ||
165056b2 MH |
2800 | reason = strbuf_detach(err, NULL); |
2801 | strbuf_addf(err, "cannot lock ref '%s': %s", | |
e3f51039 | 2802 | original_update_refname(update), reason); |
165056b2 MH |
2803 | free(reason); |
2804 | return ret; | |
2805 | } | |
92b1551b | 2806 | |
7d618264 | 2807 | update->backend_data = lock; |
92b1551b | 2808 | |
8169d0d0 | 2809 | if (update->type & REF_ISSYMREF) { |
6e30b2f6 MH |
2810 | if (update->flags & REF_NODEREF) { |
2811 | /* | |
2812 | * We won't be reading the referent as part of | |
2813 | * the transaction, so we have to read it here | |
2814 | * to record and possibly check old_sha1: | |
2815 | */ | |
2f40e954 NTND |
2816 | if (refs_read_ref_full(&refs->base, |
2817 | referent.buf, 0, | |
2818 | lock->old_oid.hash, NULL)) { | |
6e30b2f6 MH |
2819 | if (update->flags & REF_HAVE_OLD) { |
2820 | strbuf_addf(err, "cannot lock ref '%s': " | |
e3f51039 MH |
2821 | "error reading reference", |
2822 | original_update_refname(update)); | |
2823 | return -1; | |
6e30b2f6 | 2824 | } |
e3f51039 | 2825 | } else if (check_old_oid(update, &lock->old_oid, err)) { |
8169d0d0 | 2826 | return TRANSACTION_GENERIC_ERROR; |
8169d0d0 | 2827 | } |
6e30b2f6 MH |
2828 | } else { |
2829 | /* | |
2830 | * Create a new update for the reference this | |
2831 | * symref is pointing at. Also, we will record | |
2832 | * and verify old_sha1 for this update as part | |
2833 | * of processing the split-off update, so we | |
2834 | * don't have to do it here. | |
2835 | */ | |
fcc42ea0 MH |
2836 | ret = split_symref_update(refs, update, |
2837 | referent.buf, transaction, | |
92b1551b MH |
2838 | affected_refnames, err); |
2839 | if (ret) | |
2840 | return ret; | |
2841 | } | |
6e30b2f6 MH |
2842 | } else { |
2843 | struct ref_update *parent_update; | |
8169d0d0 | 2844 | |
e3f51039 MH |
2845 | if (check_old_oid(update, &lock->old_oid, err)) |
2846 | return TRANSACTION_GENERIC_ERROR; | |
2847 | ||
6e30b2f6 MH |
2848 | /* |
2849 | * If this update is happening indirectly because of a | |
2850 | * symref update, record the old SHA-1 in the parent | |
2851 | * update: | |
2852 | */ | |
2853 | for (parent_update = update->parent_update; | |
2854 | parent_update; | |
2855 | parent_update = parent_update->parent_update) { | |
7d618264 DT |
2856 | struct ref_lock *parent_lock = parent_update->backend_data; |
2857 | oidcpy(&parent_lock->old_oid, &lock->old_oid); | |
6e30b2f6 | 2858 | } |
92b1551b MH |
2859 | } |
2860 | ||
165056b2 MH |
2861 | if ((update->flags & REF_HAVE_NEW) && |
2862 | !(update->flags & REF_DELETING) && | |
2863 | !(update->flags & REF_LOG_ONLY)) { | |
92b1551b MH |
2864 | if (!(update->type & REF_ISSYMREF) && |
2865 | !hashcmp(lock->old_oid.hash, update->new_sha1)) { | |
165056b2 MH |
2866 | /* |
2867 | * The reference already has the desired | |
2868 | * value, so we don't need to write it. | |
2869 | */ | |
92b1551b | 2870 | } else if (write_ref_to_lockfile(lock, update->new_sha1, |
165056b2 MH |
2871 | err)) { |
2872 | char *write_err = strbuf_detach(err, NULL); | |
2873 | ||
2874 | /* | |
2875 | * The lock was freed upon failure of | |
2876 | * write_ref_to_lockfile(): | |
2877 | */ | |
7d618264 | 2878 | update->backend_data = NULL; |
165056b2 | 2879 | strbuf_addf(err, |
e3f51039 | 2880 | "cannot update ref '%s': %s", |
165056b2 MH |
2881 | update->refname, write_err); |
2882 | free(write_err); | |
2883 | return TRANSACTION_GENERIC_ERROR; | |
2884 | } else { | |
2885 | update->flags |= REF_NEEDS_COMMIT; | |
2886 | } | |
2887 | } | |
2888 | if (!(update->flags & REF_NEEDS_COMMIT)) { | |
2889 | /* | |
2890 | * We didn't call write_ref_to_lockfile(), so | |
2891 | * the lockfile is still open. Close it to | |
2892 | * free up the file descriptor: | |
2893 | */ | |
92b1551b | 2894 | if (close_ref(lock)) { |
165056b2 MH |
2895 | strbuf_addf(err, "couldn't close '%s.lock'", |
2896 | update->refname); | |
2897 | return TRANSACTION_GENERIC_ERROR; | |
2898 | } | |
2899 | } | |
2900 | return 0; | |
2901 | } | |
2902 | ||
127b42a1 RS |
2903 | static int files_transaction_commit(struct ref_store *ref_store, |
2904 | struct ref_transaction *transaction, | |
2905 | struct strbuf *err) | |
7bd9bcf3 | 2906 | { |
00eebe35 | 2907 | struct files_ref_store *refs = |
9e7ec634 NTND |
2908 | files_downcast(ref_store, REF_STORE_WRITE, |
2909 | "ref_transaction_commit"); | |
7bd9bcf3 | 2910 | int ret = 0, i; |
7bd9bcf3 MH |
2911 | struct string_list refs_to_delete = STRING_LIST_INIT_NODUP; |
2912 | struct string_list_item *ref_to_delete; | |
2913 | struct string_list affected_refnames = STRING_LIST_INIT_NODUP; | |
92b1551b MH |
2914 | char *head_ref = NULL; |
2915 | int head_type; | |
2916 | struct object_id head_oid; | |
e9dcc305 | 2917 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 MH |
2918 | |
2919 | assert(err); | |
2920 | ||
2921 | if (transaction->state != REF_TRANSACTION_OPEN) | |
2922 | die("BUG: commit called for transaction that is not open"); | |
2923 | ||
efe47281 | 2924 | if (!transaction->nr) { |
7bd9bcf3 MH |
2925 | transaction->state = REF_TRANSACTION_CLOSED; |
2926 | return 0; | |
2927 | } | |
2928 | ||
92b1551b MH |
2929 | /* |
2930 | * Fail if a refname appears more than once in the | |
2931 | * transaction. (If we end up splitting up any updates using | |
2932 | * split_symref_update() or split_head_update(), those | |
2933 | * functions will check that the new updates don't have the | |
2934 | * same refname as any existing ones.) | |
2935 | */ | |
2936 | for (i = 0; i < transaction->nr; i++) { | |
2937 | struct ref_update *update = transaction->updates[i]; | |
2938 | struct string_list_item *item = | |
2939 | string_list_append(&affected_refnames, update->refname); | |
2940 | ||
2941 | /* | |
2942 | * We store a pointer to update in item->util, but at | |
2943 | * the moment we never use the value of this field | |
2944 | * except to check whether it is non-NULL. | |
2945 | */ | |
2946 | item->util = update; | |
2947 | } | |
7bd9bcf3 MH |
2948 | string_list_sort(&affected_refnames); |
2949 | if (ref_update_reject_duplicates(&affected_refnames, err)) { | |
2950 | ret = TRANSACTION_GENERIC_ERROR; | |
2951 | goto cleanup; | |
2952 | } | |
2953 | ||
92b1551b MH |
2954 | /* |
2955 | * Special hack: If a branch is updated directly and HEAD | |
2956 | * points to it (may happen on the remote side of a push | |
2957 | * for example) then logically the HEAD reflog should be | |
2958 | * updated too. | |
2959 | * | |
2960 | * A generic solution would require reverse symref lookups, | |
2961 | * but finding all symrefs pointing to a given branch would be | |
2962 | * rather costly for this rare event (the direct update of a | |
2963 | * branch) to be worth it. So let's cheat and check with HEAD | |
2964 | * only, which should cover 99% of all usage scenarios (even | |
2965 | * 100% of the default ones). | |
2966 | * | |
2967 | * So if HEAD is a symbolic reference, then record the name of | |
2968 | * the reference that it points to. If we see an update of | |
2969 | * head_ref within the transaction, then split_head_update() | |
2970 | * arranges for the reflog of HEAD to be updated, too. | |
2971 | */ | |
2f40e954 NTND |
2972 | head_ref = refs_resolve_refdup(ref_store, "HEAD", |
2973 | RESOLVE_REF_NO_RECURSE, | |
2974 | head_oid.hash, &head_type); | |
92b1551b MH |
2975 | |
2976 | if (head_ref && !(head_type & REF_ISSYMREF)) { | |
2977 | free(head_ref); | |
2978 | head_ref = NULL; | |
2979 | } | |
2980 | ||
7bd9bcf3 MH |
2981 | /* |
2982 | * Acquire all locks, verify old values if provided, check | |
2983 | * that new values are valid, and write new values to the | |
2984 | * lockfiles, ready to be activated. Only keep one lockfile | |
2985 | * open at a time to avoid running out of file descriptors. | |
2986 | */ | |
efe47281 MH |
2987 | for (i = 0; i < transaction->nr; i++) { |
2988 | struct ref_update *update = transaction->updates[i]; | |
7bd9bcf3 | 2989 | |
b3bbbc5c MH |
2990 | ret = lock_ref_for_update(refs, update, transaction, |
2991 | head_ref, &affected_refnames, err); | |
165056b2 | 2992 | if (ret) |
7bd9bcf3 | 2993 | goto cleanup; |
7bd9bcf3 | 2994 | } |
7bd9bcf3 | 2995 | |
7bd9bcf3 | 2996 | /* Perform updates first so live commits remain referenced */ |
efe47281 MH |
2997 | for (i = 0; i < transaction->nr; i++) { |
2998 | struct ref_update *update = transaction->updates[i]; | |
7d618264 | 2999 | struct ref_lock *lock = update->backend_data; |
7bd9bcf3 | 3000 | |
d99aa884 DT |
3001 | if (update->flags & REF_NEEDS_COMMIT || |
3002 | update->flags & REF_LOG_ONLY) { | |
802de3da NTND |
3003 | if (files_log_ref_write(refs, |
3004 | lock->ref_name, | |
81b1b6d4 MH |
3005 | lock->old_oid.hash, |
3006 | update->new_sha1, | |
3007 | update->msg, update->flags, | |
3008 | err)) { | |
92b1551b MH |
3009 | char *old_msg = strbuf_detach(err, NULL); |
3010 | ||
3011 | strbuf_addf(err, "cannot update the ref '%s': %s", | |
3012 | lock->ref_name, old_msg); | |
3013 | free(old_msg); | |
3014 | unlock_ref(lock); | |
7d618264 | 3015 | update->backend_data = NULL; |
7bd9bcf3 MH |
3016 | ret = TRANSACTION_GENERIC_ERROR; |
3017 | goto cleanup; | |
7bd9bcf3 MH |
3018 | } |
3019 | } | |
7bd9bcf3 | 3020 | if (update->flags & REF_NEEDS_COMMIT) { |
00eebe35 | 3021 | clear_loose_ref_cache(refs); |
92b1551b MH |
3022 | if (commit_ref(lock)) { |
3023 | strbuf_addf(err, "couldn't set '%s'", lock->ref_name); | |
3024 | unlock_ref(lock); | |
7d618264 | 3025 | update->backend_data = NULL; |
7bd9bcf3 MH |
3026 | ret = TRANSACTION_GENERIC_ERROR; |
3027 | goto cleanup; | |
7bd9bcf3 MH |
3028 | } |
3029 | } | |
3030 | } | |
7bd9bcf3 | 3031 | /* Perform deletes now that updates are safely completed */ |
efe47281 MH |
3032 | for (i = 0; i < transaction->nr; i++) { |
3033 | struct ref_update *update = transaction->updates[i]; | |
7d618264 | 3034 | struct ref_lock *lock = update->backend_data; |
7bd9bcf3 | 3035 | |
d99aa884 DT |
3036 | if (update->flags & REF_DELETING && |
3037 | !(update->flags & REF_LOG_ONLY)) { | |
ce0af24d MH |
3038 | if (!(update->type & REF_ISPACKED) || |
3039 | update->type & REF_ISSYMREF) { | |
3040 | /* It is a loose reference. */ | |
e9dcc305 | 3041 | strbuf_reset(&sb); |
19e02f4f | 3042 | files_ref_path(refs, &sb, lock->ref_name); |
e9dcc305 | 3043 | if (unlink_or_msg(sb.buf, err)) { |
ce0af24d MH |
3044 | ret = TRANSACTION_GENERIC_ERROR; |
3045 | goto cleanup; | |
3046 | } | |
44639777 | 3047 | update->flags |= REF_DELETED_LOOSE; |
7bd9bcf3 MH |
3048 | } |
3049 | ||
3050 | if (!(update->flags & REF_ISPRUNING)) | |
3051 | string_list_append(&refs_to_delete, | |
7d618264 | 3052 | lock->ref_name); |
7bd9bcf3 MH |
3053 | } |
3054 | } | |
3055 | ||
0a95ac5f | 3056 | if (repack_without_refs(refs, &refs_to_delete, err)) { |
7bd9bcf3 MH |
3057 | ret = TRANSACTION_GENERIC_ERROR; |
3058 | goto cleanup; | |
3059 | } | |
44639777 MH |
3060 | |
3061 | /* Delete the reflogs of any references that were deleted: */ | |
3062 | for_each_string_list_item(ref_to_delete, &refs_to_delete) { | |
e9dcc305 | 3063 | strbuf_reset(&sb); |
802de3da | 3064 | files_reflog_path(refs, &sb, ref_to_delete->string); |
e9dcc305 | 3065 | if (!unlink_or_warn(sb.buf)) |
802de3da | 3066 | try_remove_empty_parents(refs, ref_to_delete->string, |
44639777 MH |
3067 | REMOVE_EMPTY_PARENTS_REFLOG); |
3068 | } | |
3069 | ||
00eebe35 | 3070 | clear_loose_ref_cache(refs); |
7bd9bcf3 MH |
3071 | |
3072 | cleanup: | |
e9dcc305 | 3073 | strbuf_release(&sb); |
7bd9bcf3 MH |
3074 | transaction->state = REF_TRANSACTION_CLOSED; |
3075 | ||
44639777 MH |
3076 | for (i = 0; i < transaction->nr; i++) { |
3077 | struct ref_update *update = transaction->updates[i]; | |
3078 | struct ref_lock *lock = update->backend_data; | |
3079 | ||
3080 | if (lock) | |
3081 | unlock_ref(lock); | |
3082 | ||
3083 | if (update->flags & REF_DELETED_LOOSE) { | |
3084 | /* | |
3085 | * The loose reference was deleted. Delete any | |
3086 | * empty parent directories. (Note that this | |
3087 | * can only work because we have already | |
3088 | * removed the lockfile.) | |
3089 | */ | |
802de3da | 3090 | try_remove_empty_parents(refs, update->refname, |
44639777 MH |
3091 | REMOVE_EMPTY_PARENTS_REF); |
3092 | } | |
3093 | } | |
3094 | ||
7bd9bcf3 | 3095 | string_list_clear(&refs_to_delete, 0); |
92b1551b | 3096 | free(head_ref); |
7bd9bcf3 | 3097 | string_list_clear(&affected_refnames, 0); |
92b1551b | 3098 | |
7bd9bcf3 MH |
3099 | return ret; |
3100 | } | |
3101 | ||
3102 | static int ref_present(const char *refname, | |
3103 | const struct object_id *oid, int flags, void *cb_data) | |
3104 | { | |
3105 | struct string_list *affected_refnames = cb_data; | |
3106 | ||
3107 | return string_list_has_string(affected_refnames, refname); | |
3108 | } | |
3109 | ||
fc681463 DT |
3110 | static int files_initial_transaction_commit(struct ref_store *ref_store, |
3111 | struct ref_transaction *transaction, | |
3112 | struct strbuf *err) | |
7bd9bcf3 | 3113 | { |
d99825ab | 3114 | struct files_ref_store *refs = |
9e7ec634 NTND |
3115 | files_downcast(ref_store, REF_STORE_WRITE, |
3116 | "initial_ref_transaction_commit"); | |
7bd9bcf3 | 3117 | int ret = 0, i; |
7bd9bcf3 MH |
3118 | struct string_list affected_refnames = STRING_LIST_INIT_NODUP; |
3119 | ||
3120 | assert(err); | |
3121 | ||
3122 | if (transaction->state != REF_TRANSACTION_OPEN) | |
3123 | die("BUG: commit called for transaction that is not open"); | |
3124 | ||
3125 | /* Fail if a refname appears more than once in the transaction: */ | |
efe47281 MH |
3126 | for (i = 0; i < transaction->nr; i++) |
3127 | string_list_append(&affected_refnames, | |
3128 | transaction->updates[i]->refname); | |
7bd9bcf3 MH |
3129 | string_list_sort(&affected_refnames); |
3130 | if (ref_update_reject_duplicates(&affected_refnames, err)) { | |
3131 | ret = TRANSACTION_GENERIC_ERROR; | |
3132 | goto cleanup; | |
3133 | } | |
3134 | ||
3135 | /* | |
3136 | * It's really undefined to call this function in an active | |
3137 | * repository or when there are existing references: we are | |
3138 | * only locking and changing packed-refs, so (1) any | |
3139 | * simultaneous processes might try to change a reference at | |
3140 | * the same time we do, and (2) any existing loose versions of | |
3141 | * the references that we are setting would have precedence | |
3142 | * over our values. But some remote helpers create the remote | |
3143 | * "HEAD" and "master" branches before calling this function, | |
3144 | * so here we really only check that none of the references | |
3145 | * that we are creating already exists. | |
3146 | */ | |
2f40e954 NTND |
3147 | if (refs_for_each_rawref(&refs->base, ref_present, |
3148 | &affected_refnames)) | |
7bd9bcf3 MH |
3149 | die("BUG: initial ref transaction called with existing refs"); |
3150 | ||
efe47281 MH |
3151 | for (i = 0; i < transaction->nr; i++) { |
3152 | struct ref_update *update = transaction->updates[i]; | |
7bd9bcf3 MH |
3153 | |
3154 | if ((update->flags & REF_HAVE_OLD) && | |
3155 | !is_null_sha1(update->old_sha1)) | |
3156 | die("BUG: initial ref transaction with old_sha1 set"); | |
7d2df051 NTND |
3157 | if (refs_verify_refname_available(&refs->base, update->refname, |
3158 | &affected_refnames, NULL, | |
3159 | err)) { | |
7bd9bcf3 MH |
3160 | ret = TRANSACTION_NAME_CONFLICT; |
3161 | goto cleanup; | |
3162 | } | |
3163 | } | |
3164 | ||
49c0df6a | 3165 | if (lock_packed_refs(refs, 0)) { |
7bd9bcf3 MH |
3166 | strbuf_addf(err, "unable to lock packed-refs file: %s", |
3167 | strerror(errno)); | |
3168 | ret = TRANSACTION_GENERIC_ERROR; | |
3169 | goto cleanup; | |
3170 | } | |
3171 | ||
efe47281 MH |
3172 | for (i = 0; i < transaction->nr; i++) { |
3173 | struct ref_update *update = transaction->updates[i]; | |
7bd9bcf3 MH |
3174 | |
3175 | if ((update->flags & REF_HAVE_NEW) && | |
3176 | !is_null_sha1(update->new_sha1)) | |
d99825ab | 3177 | add_packed_ref(refs, update->refname, update->new_sha1); |
7bd9bcf3 MH |
3178 | } |
3179 | ||
49c0df6a | 3180 | if (commit_packed_refs(refs)) { |
7bd9bcf3 MH |
3181 | strbuf_addf(err, "unable to commit packed-refs file: %s", |
3182 | strerror(errno)); | |
3183 | ret = TRANSACTION_GENERIC_ERROR; | |
3184 | goto cleanup; | |
3185 | } | |
3186 | ||
3187 | cleanup: | |
3188 | transaction->state = REF_TRANSACTION_CLOSED; | |
3189 | string_list_clear(&affected_refnames, 0); | |
3190 | return ret; | |
3191 | } | |
3192 | ||
3193 | struct expire_reflog_cb { | |
3194 | unsigned int flags; | |
3195 | reflog_expiry_should_prune_fn *should_prune_fn; | |
3196 | void *policy_cb; | |
3197 | FILE *newlog; | |
9461d272 | 3198 | struct object_id last_kept_oid; |
7bd9bcf3 MH |
3199 | }; |
3200 | ||
9461d272 | 3201 | static int expire_reflog_ent(struct object_id *ooid, struct object_id *noid, |
7bd9bcf3 MH |
3202 | const char *email, unsigned long timestamp, int tz, |
3203 | const char *message, void *cb_data) | |
3204 | { | |
3205 | struct expire_reflog_cb *cb = cb_data; | |
3206 | struct expire_reflog_policy_cb *policy_cb = cb->policy_cb; | |
3207 | ||
3208 | if (cb->flags & EXPIRE_REFLOGS_REWRITE) | |
9461d272 | 3209 | ooid = &cb->last_kept_oid; |
7bd9bcf3 | 3210 | |
9461d272 | 3211 | if ((*cb->should_prune_fn)(ooid->hash, noid->hash, email, timestamp, tz, |
7bd9bcf3 MH |
3212 | message, policy_cb)) { |
3213 | if (!cb->newlog) | |
3214 | printf("would prune %s", message); | |
3215 | else if (cb->flags & EXPIRE_REFLOGS_VERBOSE) | |
3216 | printf("prune %s", message); | |
3217 | } else { | |
3218 | if (cb->newlog) { | |
3219 | fprintf(cb->newlog, "%s %s %s %lu %+05d\t%s", | |
9461d272 | 3220 | oid_to_hex(ooid), oid_to_hex(noid), |
7bd9bcf3 | 3221 | email, timestamp, tz, message); |
9461d272 | 3222 | oidcpy(&cb->last_kept_oid, noid); |
7bd9bcf3 MH |
3223 | } |
3224 | if (cb->flags & EXPIRE_REFLOGS_VERBOSE) | |
3225 | printf("keep %s", message); | |
3226 | } | |
3227 | return 0; | |
3228 | } | |
3229 | ||
e3688bd6 DT |
3230 | static int files_reflog_expire(struct ref_store *ref_store, |
3231 | const char *refname, const unsigned char *sha1, | |
3232 | unsigned int flags, | |
3233 | reflog_expiry_prepare_fn prepare_fn, | |
3234 | reflog_expiry_should_prune_fn should_prune_fn, | |
3235 | reflog_expiry_cleanup_fn cleanup_fn, | |
3236 | void *policy_cb_data) | |
7bd9bcf3 | 3237 | { |
7eb27cdf | 3238 | struct files_ref_store *refs = |
9e7ec634 | 3239 | files_downcast(ref_store, REF_STORE_WRITE, "reflog_expire"); |
7bd9bcf3 MH |
3240 | static struct lock_file reflog_lock; |
3241 | struct expire_reflog_cb cb; | |
3242 | struct ref_lock *lock; | |
802de3da | 3243 | struct strbuf log_file_sb = STRBUF_INIT; |
7bd9bcf3 MH |
3244 | char *log_file; |
3245 | int status = 0; | |
3246 | int type; | |
3247 | struct strbuf err = STRBUF_INIT; | |
3248 | ||
3249 | memset(&cb, 0, sizeof(cb)); | |
3250 | cb.flags = flags; | |
3251 | cb.policy_cb = policy_cb_data; | |
3252 | cb.should_prune_fn = should_prune_fn; | |
3253 | ||
3254 | /* | |
3255 | * The reflog file is locked by holding the lock on the | |
3256 | * reference itself, plus we might need to update the | |
3257 | * reference if --updateref was specified: | |
3258 | */ | |
7eb27cdf MH |
3259 | lock = lock_ref_sha1_basic(refs, refname, sha1, |
3260 | NULL, NULL, REF_NODEREF, | |
41d796ed | 3261 | &type, &err); |
7bd9bcf3 MH |
3262 | if (!lock) { |
3263 | error("cannot lock ref '%s': %s", refname, err.buf); | |
3264 | strbuf_release(&err); | |
3265 | return -1; | |
3266 | } | |
2f40e954 | 3267 | if (!refs_reflog_exists(ref_store, refname)) { |
7bd9bcf3 MH |
3268 | unlock_ref(lock); |
3269 | return 0; | |
3270 | } | |
3271 | ||
802de3da NTND |
3272 | files_reflog_path(refs, &log_file_sb, refname); |
3273 | log_file = strbuf_detach(&log_file_sb, NULL); | |
7bd9bcf3 MH |
3274 | if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) { |
3275 | /* | |
3276 | * Even though holding $GIT_DIR/logs/$reflog.lock has | |
3277 | * no locking implications, we use the lock_file | |
3278 | * machinery here anyway because it does a lot of the | |
3279 | * work we need, including cleaning up if the program | |
3280 | * exits unexpectedly. | |
3281 | */ | |
3282 | if (hold_lock_file_for_update(&reflog_lock, log_file, 0) < 0) { | |
3283 | struct strbuf err = STRBUF_INIT; | |
3284 | unable_to_lock_message(log_file, errno, &err); | |
3285 | error("%s", err.buf); | |
3286 | strbuf_release(&err); | |
3287 | goto failure; | |
3288 | } | |
3289 | cb.newlog = fdopen_lock_file(&reflog_lock, "w"); | |
3290 | if (!cb.newlog) { | |
3291 | error("cannot fdopen %s (%s)", | |
3292 | get_lock_file_path(&reflog_lock), strerror(errno)); | |
3293 | goto failure; | |
3294 | } | |
3295 | } | |
3296 | ||
3297 | (*prepare_fn)(refname, sha1, cb.policy_cb); | |
2f40e954 | 3298 | refs_for_each_reflog_ent(ref_store, refname, expire_reflog_ent, &cb); |
7bd9bcf3 MH |
3299 | (*cleanup_fn)(cb.policy_cb); |
3300 | ||
3301 | if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) { | |
3302 | /* | |
3303 | * It doesn't make sense to adjust a reference pointed | |
3304 | * to by a symbolic ref based on expiring entries in | |
3305 | * the symbolic reference's reflog. Nor can we update | |
3306 | * a reference if there are no remaining reflog | |
3307 | * entries. | |
3308 | */ | |
3309 | int update = (flags & EXPIRE_REFLOGS_UPDATE_REF) && | |
3310 | !(type & REF_ISSYMREF) && | |
9461d272 | 3311 | !is_null_oid(&cb.last_kept_oid); |
7bd9bcf3 MH |
3312 | |
3313 | if (close_lock_file(&reflog_lock)) { | |
3314 | status |= error("couldn't write %s: %s", log_file, | |
3315 | strerror(errno)); | |
3316 | } else if (update && | |
3317 | (write_in_full(get_lock_file_fd(lock->lk), | |
9461d272 | 3318 | oid_to_hex(&cb.last_kept_oid), GIT_SHA1_HEXSZ) != GIT_SHA1_HEXSZ || |
7bd9bcf3 MH |
3319 | write_str_in_full(get_lock_file_fd(lock->lk), "\n") != 1 || |
3320 | close_ref(lock) < 0)) { | |
3321 | status |= error("couldn't write %s", | |
3322 | get_lock_file_path(lock->lk)); | |
3323 | rollback_lock_file(&reflog_lock); | |
3324 | } else if (commit_lock_file(&reflog_lock)) { | |
e0048d3e | 3325 | status |= error("unable to write reflog '%s' (%s)", |
7bd9bcf3 MH |
3326 | log_file, strerror(errno)); |
3327 | } else if (update && commit_ref(lock)) { | |
3328 | status |= error("couldn't set %s", lock->ref_name); | |
3329 | } | |
3330 | } | |
3331 | free(log_file); | |
3332 | unlock_ref(lock); | |
3333 | return status; | |
3334 | ||
3335 | failure: | |
3336 | rollback_lock_file(&reflog_lock); | |
3337 | free(log_file); | |
3338 | unlock_ref(lock); | |
3339 | return -1; | |
3340 | } | |
3dce444f | 3341 | |
6fb5acfd DT |
3342 | static int files_init_db(struct ref_store *ref_store, struct strbuf *err) |
3343 | { | |
19e02f4f | 3344 | struct files_ref_store *refs = |
9e7ec634 | 3345 | files_downcast(ref_store, REF_STORE_WRITE, "init_db"); |
e9dcc305 NTND |
3346 | struct strbuf sb = STRBUF_INIT; |
3347 | ||
6fb5acfd DT |
3348 | /* |
3349 | * Create .git/refs/{heads,tags} | |
3350 | */ | |
19e02f4f | 3351 | files_ref_path(refs, &sb, "refs/heads"); |
e9dcc305 NTND |
3352 | safe_create_dir(sb.buf, 1); |
3353 | ||
3354 | strbuf_reset(&sb); | |
19e02f4f | 3355 | files_ref_path(refs, &sb, "refs/tags"); |
e9dcc305 NTND |
3356 | safe_create_dir(sb.buf, 1); |
3357 | ||
3358 | strbuf_release(&sb); | |
6fb5acfd DT |
3359 | return 0; |
3360 | } | |
3361 | ||
3dce444f RS |
3362 | struct ref_storage_be refs_be_files = { |
3363 | NULL, | |
00eebe35 | 3364 | "files", |
127b42a1 | 3365 | files_ref_store_create, |
6fb5acfd | 3366 | files_init_db, |
e1e33b72 | 3367 | files_transaction_commit, |
fc681463 | 3368 | files_initial_transaction_commit, |
e1e33b72 | 3369 | |
8231527e | 3370 | files_pack_refs, |
bd427cf2 | 3371 | files_peel_ref, |
284689ba | 3372 | files_create_symref, |
a27dcf89 | 3373 | files_delete_refs, |
9b6b40d9 | 3374 | files_rename_ref, |
8231527e | 3375 | |
1a769003 | 3376 | files_ref_iterator_begin, |
62665823 | 3377 | files_read_raw_ref, |
e3688bd6 DT |
3378 | |
3379 | files_reflog_iterator_begin, | |
3380 | files_for_each_reflog_ent, | |
3381 | files_for_each_reflog_ent_reverse, | |
3382 | files_reflog_exists, | |
3383 | files_create_reflog, | |
3384 | files_delete_reflog, | |
3385 | files_reflog_expire | |
3dce444f | 3386 | }; |