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Commit | Line | Data |
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7bd9bcf3 MH |
1 | #include "../cache.h" |
2 | #include "../refs.h" | |
3 | #include "refs-internal.h" | |
958f9646 | 4 | #include "ref-cache.h" |
3bc581b9 | 5 | #include "../iterator.h" |
2880d16f | 6 | #include "../dir-iterator.h" |
7bd9bcf3 MH |
7 | #include "../lockfile.h" |
8 | #include "../object.h" | |
9 | #include "../dir.h" | |
10 | ||
11 | struct ref_lock { | |
12 | char *ref_name; | |
7bd9bcf3 MH |
13 | struct lock_file *lk; |
14 | struct object_id old_oid; | |
15 | }; | |
16 | ||
7bd9bcf3 | 17 | /* |
a8739244 MH |
18 | * Return true if refname, which has the specified oid and flags, can |
19 | * be resolved to an object in the database. If the referred-to object | |
20 | * does not exist, emit a warning and return false. | |
7bd9bcf3 | 21 | */ |
a8739244 MH |
22 | static int ref_resolves_to_object(const char *refname, |
23 | const struct object_id *oid, | |
24 | unsigned int flags) | |
7bd9bcf3 | 25 | { |
a8739244 | 26 | if (flags & REF_ISBROKEN) |
7bd9bcf3 | 27 | return 0; |
a8739244 MH |
28 | if (!has_sha1_file(oid->hash)) { |
29 | error("%s does not point to a valid object!", refname); | |
7bd9bcf3 MH |
30 | return 0; |
31 | } | |
32 | return 1; | |
33 | } | |
34 | ||
35 | /* | |
a8739244 MH |
36 | * Return true if the reference described by entry can be resolved to |
37 | * an object in the database; otherwise, emit a warning and return | |
38 | * false. | |
7bd9bcf3 | 39 | */ |
a8739244 | 40 | static int entry_resolves_to_object(struct ref_entry *entry) |
7bd9bcf3 | 41 | { |
a8739244 MH |
42 | return ref_resolves_to_object(entry->name, |
43 | &entry->u.value.oid, entry->flag); | |
7bd9bcf3 MH |
44 | } |
45 | ||
7bd9bcf3 | 46 | struct packed_ref_cache { |
7c22bc8a | 47 | struct ref_cache *cache; |
7bd9bcf3 MH |
48 | |
49 | /* | |
50 | * Count of references to the data structure in this instance, | |
65a0a8e5 MH |
51 | * including the pointer from files_ref_store::packed if any. |
52 | * The data will not be freed as long as the reference count | |
53 | * is nonzero. | |
7bd9bcf3 MH |
54 | */ |
55 | unsigned int referrers; | |
56 | ||
57 | /* | |
58 | * Iff the packed-refs file associated with this instance is | |
59 | * currently locked for writing, this points at the associated | |
60 | * lock (which is owned by somebody else). The referrer count | |
61 | * is also incremented when the file is locked and decremented | |
62 | * when it is unlocked. | |
63 | */ | |
64 | struct lock_file *lock; | |
65 | ||
66 | /* The metadata from when this packed-refs cache was read */ | |
67 | struct stat_validity validity; | |
68 | }; | |
69 | ||
70 | /* | |
71 | * Future: need to be in "struct repository" | |
72 | * when doing a full libification. | |
73 | */ | |
00eebe35 MH |
74 | struct files_ref_store { |
75 | struct ref_store base; | |
9e7ec634 | 76 | unsigned int store_flags; |
32c597e7 | 77 | |
f57f37e2 NTND |
78 | char *gitdir; |
79 | char *gitcommondir; | |
33dfb9f3 NTND |
80 | char *packed_refs_path; |
81 | ||
7c22bc8a | 82 | struct ref_cache *loose; |
7bd9bcf3 | 83 | struct packed_ref_cache *packed; |
00eebe35 | 84 | }; |
7bd9bcf3 MH |
85 | |
86 | /* Lock used for the main packed-refs file: */ | |
87 | static struct lock_file packlock; | |
88 | ||
89 | /* | |
90 | * Increment the reference count of *packed_refs. | |
91 | */ | |
92 | static void acquire_packed_ref_cache(struct packed_ref_cache *packed_refs) | |
93 | { | |
94 | packed_refs->referrers++; | |
95 | } | |
96 | ||
97 | /* | |
98 | * Decrease the reference count of *packed_refs. If it goes to zero, | |
99 | * free *packed_refs and return true; otherwise return false. | |
100 | */ | |
101 | static int release_packed_ref_cache(struct packed_ref_cache *packed_refs) | |
102 | { | |
103 | if (!--packed_refs->referrers) { | |
7c22bc8a | 104 | free_ref_cache(packed_refs->cache); |
7bd9bcf3 MH |
105 | stat_validity_clear(&packed_refs->validity); |
106 | free(packed_refs); | |
107 | return 1; | |
108 | } else { | |
109 | return 0; | |
110 | } | |
111 | } | |
112 | ||
65a0a8e5 | 113 | static void clear_packed_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 MH |
114 | { |
115 | if (refs->packed) { | |
116 | struct packed_ref_cache *packed_refs = refs->packed; | |
117 | ||
118 | if (packed_refs->lock) | |
119 | die("internal error: packed-ref cache cleared while locked"); | |
120 | refs->packed = NULL; | |
121 | release_packed_ref_cache(packed_refs); | |
122 | } | |
123 | } | |
124 | ||
65a0a8e5 | 125 | static void clear_loose_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 MH |
126 | { |
127 | if (refs->loose) { | |
7c22bc8a | 128 | free_ref_cache(refs->loose); |
7bd9bcf3 MH |
129 | refs->loose = NULL; |
130 | } | |
131 | } | |
132 | ||
a2d5156c JK |
133 | /* |
134 | * Create a new submodule ref cache and add it to the internal | |
135 | * set of caches. | |
136 | */ | |
9e7ec634 NTND |
137 | static struct ref_store *files_ref_store_create(const char *gitdir, |
138 | unsigned int flags) | |
7bd9bcf3 | 139 | { |
00eebe35 MH |
140 | struct files_ref_store *refs = xcalloc(1, sizeof(*refs)); |
141 | struct ref_store *ref_store = (struct ref_store *)refs; | |
f57f37e2 | 142 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 | 143 | |
fbfd0a29 | 144 | base_ref_store_init(ref_store, &refs_be_files); |
9e7ec634 | 145 | refs->store_flags = flags; |
7bd9bcf3 | 146 | |
f57f37e2 NTND |
147 | refs->gitdir = xstrdup(gitdir); |
148 | get_common_dir_noenv(&sb, gitdir); | |
149 | refs->gitcommondir = strbuf_detach(&sb, NULL); | |
150 | strbuf_addf(&sb, "%s/packed-refs", refs->gitcommondir); | |
151 | refs->packed_refs_path = strbuf_detach(&sb, NULL); | |
7bd9bcf3 | 152 | |
00eebe35 | 153 | return ref_store; |
a2d5156c | 154 | } |
7bd9bcf3 | 155 | |
32c597e7 | 156 | /* |
9e7ec634 NTND |
157 | * Die if refs is not the main ref store. caller is used in any |
158 | * necessary error messages. | |
32c597e7 MH |
159 | */ |
160 | static void files_assert_main_repository(struct files_ref_store *refs, | |
161 | const char *caller) | |
162 | { | |
9e7ec634 NTND |
163 | if (refs->store_flags & REF_STORE_MAIN) |
164 | return; | |
165 | ||
166 | die("BUG: operation %s only allowed for main ref store", caller); | |
32c597e7 MH |
167 | } |
168 | ||
a2d5156c | 169 | /* |
00eebe35 | 170 | * Downcast ref_store to files_ref_store. Die if ref_store is not a |
9e7ec634 NTND |
171 | * files_ref_store. required_flags is compared with ref_store's |
172 | * store_flags to ensure the ref_store has all required capabilities. | |
173 | * "caller" is used in any necessary error messages. | |
a2d5156c | 174 | */ |
9e7ec634 NTND |
175 | static struct files_ref_store *files_downcast(struct ref_store *ref_store, |
176 | unsigned int required_flags, | |
177 | const char *caller) | |
a2d5156c | 178 | { |
32c597e7 MH |
179 | struct files_ref_store *refs; |
180 | ||
00eebe35 MH |
181 | if (ref_store->be != &refs_be_files) |
182 | die("BUG: ref_store is type \"%s\" not \"files\" in %s", | |
183 | ref_store->be->name, caller); | |
2eed2780 | 184 | |
32c597e7 MH |
185 | refs = (struct files_ref_store *)ref_store; |
186 | ||
9e7ec634 NTND |
187 | if ((refs->store_flags & required_flags) != required_flags) |
188 | die("BUG: operation %s requires abilities 0x%x, but only have 0x%x", | |
189 | caller, required_flags, refs->store_flags); | |
2eed2780 | 190 | |
32c597e7 | 191 | return refs; |
7bd9bcf3 MH |
192 | } |
193 | ||
194 | /* The length of a peeled reference line in packed-refs, including EOL: */ | |
195 | #define PEELED_LINE_LENGTH 42 | |
196 | ||
197 | /* | |
198 | * The packed-refs header line that we write out. Perhaps other | |
199 | * traits will be added later. The trailing space is required. | |
200 | */ | |
201 | static const char PACKED_REFS_HEADER[] = | |
202 | "# pack-refs with: peeled fully-peeled \n"; | |
203 | ||
204 | /* | |
205 | * Parse one line from a packed-refs file. Write the SHA1 to sha1. | |
206 | * Return a pointer to the refname within the line (null-terminated), | |
207 | * or NULL if there was a problem. | |
208 | */ | |
209 | static const char *parse_ref_line(struct strbuf *line, unsigned char *sha1) | |
210 | { | |
211 | const char *ref; | |
212 | ||
213 | /* | |
214 | * 42: the answer to everything. | |
215 | * | |
216 | * In this case, it happens to be the answer to | |
217 | * 40 (length of sha1 hex representation) | |
218 | * +1 (space in between hex and name) | |
219 | * +1 (newline at the end of the line) | |
220 | */ | |
221 | if (line->len <= 42) | |
222 | return NULL; | |
223 | ||
224 | if (get_sha1_hex(line->buf, sha1) < 0) | |
225 | return NULL; | |
226 | if (!isspace(line->buf[40])) | |
227 | return NULL; | |
228 | ||
229 | ref = line->buf + 41; | |
230 | if (isspace(*ref)) | |
231 | return NULL; | |
232 | ||
233 | if (line->buf[line->len - 1] != '\n') | |
234 | return NULL; | |
235 | line->buf[--line->len] = 0; | |
236 | ||
237 | return ref; | |
238 | } | |
239 | ||
240 | /* | |
241 | * Read f, which is a packed-refs file, into dir. | |
242 | * | |
243 | * A comment line of the form "# pack-refs with: " may contain zero or | |
244 | * more traits. We interpret the traits as follows: | |
245 | * | |
246 | * No traits: | |
247 | * | |
248 | * Probably no references are peeled. But if the file contains a | |
249 | * peeled value for a reference, we will use it. | |
250 | * | |
251 | * peeled: | |
252 | * | |
253 | * References under "refs/tags/", if they *can* be peeled, *are* | |
254 | * peeled in this file. References outside of "refs/tags/" are | |
255 | * probably not peeled even if they could have been, but if we find | |
256 | * a peeled value for such a reference we will use it. | |
257 | * | |
258 | * fully-peeled: | |
259 | * | |
260 | * All references in the file that can be peeled are peeled. | |
261 | * Inversely (and this is more important), any references in the | |
262 | * file for which no peeled value is recorded is not peelable. This | |
263 | * trait should typically be written alongside "peeled" for | |
264 | * compatibility with older clients, but we do not require it | |
265 | * (i.e., "peeled" is a no-op if "fully-peeled" is set). | |
266 | */ | |
267 | static void read_packed_refs(FILE *f, struct ref_dir *dir) | |
268 | { | |
269 | struct ref_entry *last = NULL; | |
270 | struct strbuf line = STRBUF_INIT; | |
271 | enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE; | |
272 | ||
273 | while (strbuf_getwholeline(&line, f, '\n') != EOF) { | |
274 | unsigned char sha1[20]; | |
275 | const char *refname; | |
276 | const char *traits; | |
277 | ||
278 | if (skip_prefix(line.buf, "# pack-refs with:", &traits)) { | |
279 | if (strstr(traits, " fully-peeled ")) | |
280 | peeled = PEELED_FULLY; | |
281 | else if (strstr(traits, " peeled ")) | |
282 | peeled = PEELED_TAGS; | |
283 | /* perhaps other traits later as well */ | |
284 | continue; | |
285 | } | |
286 | ||
287 | refname = parse_ref_line(&line, sha1); | |
288 | if (refname) { | |
289 | int flag = REF_ISPACKED; | |
290 | ||
291 | if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) { | |
292 | if (!refname_is_safe(refname)) | |
293 | die("packed refname is dangerous: %s", refname); | |
294 | hashclr(sha1); | |
295 | flag |= REF_BAD_NAME | REF_ISBROKEN; | |
296 | } | |
297 | last = create_ref_entry(refname, sha1, flag, 0); | |
298 | if (peeled == PEELED_FULLY || | |
299 | (peeled == PEELED_TAGS && starts_with(refname, "refs/tags/"))) | |
300 | last->flag |= REF_KNOWS_PEELED; | |
a3ade2ba | 301 | add_ref_entry(dir, last); |
7bd9bcf3 MH |
302 | continue; |
303 | } | |
304 | if (last && | |
305 | line.buf[0] == '^' && | |
306 | line.len == PEELED_LINE_LENGTH && | |
307 | line.buf[PEELED_LINE_LENGTH - 1] == '\n' && | |
308 | !get_sha1_hex(line.buf + 1, sha1)) { | |
309 | hashcpy(last->u.value.peeled.hash, sha1); | |
310 | /* | |
311 | * Regardless of what the file header said, | |
312 | * we definitely know the value of *this* | |
313 | * reference: | |
314 | */ | |
315 | last->flag |= REF_KNOWS_PEELED; | |
316 | } | |
317 | } | |
318 | ||
319 | strbuf_release(&line); | |
320 | } | |
321 | ||
33dfb9f3 NTND |
322 | static const char *files_packed_refs_path(struct files_ref_store *refs) |
323 | { | |
324 | return refs->packed_refs_path; | |
325 | } | |
326 | ||
802de3da NTND |
327 | static void files_reflog_path(struct files_ref_store *refs, |
328 | struct strbuf *sb, | |
329 | const char *refname) | |
330 | { | |
331 | if (!refname) { | |
f57f37e2 NTND |
332 | /* |
333 | * FIXME: of course this is wrong in multi worktree | |
334 | * setting. To be fixed real soon. | |
335 | */ | |
336 | strbuf_addf(sb, "%s/logs", refs->gitcommondir); | |
802de3da NTND |
337 | return; |
338 | } | |
339 | ||
f57f37e2 NTND |
340 | switch (ref_type(refname)) { |
341 | case REF_TYPE_PER_WORKTREE: | |
342 | case REF_TYPE_PSEUDOREF: | |
343 | strbuf_addf(sb, "%s/logs/%s", refs->gitdir, refname); | |
344 | break; | |
345 | case REF_TYPE_NORMAL: | |
346 | strbuf_addf(sb, "%s/logs/%s", refs->gitcommondir, refname); | |
347 | break; | |
348 | default: | |
349 | die("BUG: unknown ref type %d of ref %s", | |
350 | ref_type(refname), refname); | |
351 | } | |
802de3da NTND |
352 | } |
353 | ||
19e02f4f NTND |
354 | static void files_ref_path(struct files_ref_store *refs, |
355 | struct strbuf *sb, | |
356 | const char *refname) | |
357 | { | |
f57f37e2 NTND |
358 | switch (ref_type(refname)) { |
359 | case REF_TYPE_PER_WORKTREE: | |
360 | case REF_TYPE_PSEUDOREF: | |
361 | strbuf_addf(sb, "%s/%s", refs->gitdir, refname); | |
362 | break; | |
363 | case REF_TYPE_NORMAL: | |
364 | strbuf_addf(sb, "%s/%s", refs->gitcommondir, refname); | |
365 | break; | |
366 | default: | |
367 | die("BUG: unknown ref type %d of ref %s", | |
368 | ref_type(refname), refname); | |
369 | } | |
19e02f4f NTND |
370 | } |
371 | ||
7bd9bcf3 | 372 | /* |
65a0a8e5 MH |
373 | * Get the packed_ref_cache for the specified files_ref_store, |
374 | * creating it if necessary. | |
7bd9bcf3 | 375 | */ |
65a0a8e5 | 376 | static struct packed_ref_cache *get_packed_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 | 377 | { |
33dfb9f3 | 378 | const char *packed_refs_file = files_packed_refs_path(refs); |
7bd9bcf3 MH |
379 | |
380 | if (refs->packed && | |
381 | !stat_validity_check(&refs->packed->validity, packed_refs_file)) | |
382 | clear_packed_ref_cache(refs); | |
383 | ||
384 | if (!refs->packed) { | |
385 | FILE *f; | |
386 | ||
387 | refs->packed = xcalloc(1, sizeof(*refs->packed)); | |
388 | acquire_packed_ref_cache(refs->packed); | |
df308759 | 389 | refs->packed->cache = create_ref_cache(&refs->base, NULL); |
7c22bc8a | 390 | refs->packed->cache->root->flag &= ~REF_INCOMPLETE; |
7bd9bcf3 MH |
391 | f = fopen(packed_refs_file, "r"); |
392 | if (f) { | |
393 | stat_validity_update(&refs->packed->validity, fileno(f)); | |
7c22bc8a | 394 | read_packed_refs(f, get_ref_dir(refs->packed->cache->root)); |
7bd9bcf3 MH |
395 | fclose(f); |
396 | } | |
397 | } | |
7bd9bcf3 MH |
398 | return refs->packed; |
399 | } | |
400 | ||
401 | static struct ref_dir *get_packed_ref_dir(struct packed_ref_cache *packed_ref_cache) | |
402 | { | |
7c22bc8a | 403 | return get_ref_dir(packed_ref_cache->cache->root); |
7bd9bcf3 MH |
404 | } |
405 | ||
65a0a8e5 | 406 | static struct ref_dir *get_packed_refs(struct files_ref_store *refs) |
7bd9bcf3 MH |
407 | { |
408 | return get_packed_ref_dir(get_packed_ref_cache(refs)); | |
409 | } | |
410 | ||
411 | /* | |
412 | * Add a reference to the in-memory packed reference cache. This may | |
413 | * only be called while the packed-refs file is locked (see | |
414 | * lock_packed_refs()). To actually write the packed-refs file, call | |
415 | * commit_packed_refs(). | |
416 | */ | |
d99825ab MH |
417 | static void add_packed_ref(struct files_ref_store *refs, |
418 | const char *refname, const unsigned char *sha1) | |
7bd9bcf3 | 419 | { |
00eebe35 | 420 | struct packed_ref_cache *packed_ref_cache = get_packed_ref_cache(refs); |
7bd9bcf3 MH |
421 | |
422 | if (!packed_ref_cache->lock) | |
423 | die("internal error: packed refs not locked"); | |
a3ade2ba | 424 | add_ref_entry(get_packed_ref_dir(packed_ref_cache), |
958f9646 | 425 | create_ref_entry(refname, sha1, REF_ISPACKED, 1)); |
7bd9bcf3 MH |
426 | } |
427 | ||
428 | /* | |
429 | * Read the loose references from the namespace dirname into dir | |
430 | * (without recursing). dirname must end with '/'. dir must be the | |
431 | * directory entry corresponding to dirname. | |
432 | */ | |
df308759 MH |
433 | static void loose_fill_ref_dir(struct ref_store *ref_store, |
434 | struct ref_dir *dir, const char *dirname) | |
7bd9bcf3 | 435 | { |
df308759 MH |
436 | struct files_ref_store *refs = |
437 | files_downcast(ref_store, REF_STORE_READ, "fill_ref_dir"); | |
7bd9bcf3 MH |
438 | DIR *d; |
439 | struct dirent *de; | |
440 | int dirnamelen = strlen(dirname); | |
441 | struct strbuf refname; | |
442 | struct strbuf path = STRBUF_INIT; | |
443 | size_t path_baselen; | |
444 | ||
19e02f4f | 445 | files_ref_path(refs, &path, dirname); |
7bd9bcf3 MH |
446 | path_baselen = path.len; |
447 | ||
448 | d = opendir(path.buf); | |
449 | if (!d) { | |
450 | strbuf_release(&path); | |
451 | return; | |
452 | } | |
453 | ||
454 | strbuf_init(&refname, dirnamelen + 257); | |
455 | strbuf_add(&refname, dirname, dirnamelen); | |
456 | ||
457 | while ((de = readdir(d)) != NULL) { | |
458 | unsigned char sha1[20]; | |
459 | struct stat st; | |
460 | int flag; | |
461 | ||
462 | if (de->d_name[0] == '.') | |
463 | continue; | |
464 | if (ends_with(de->d_name, ".lock")) | |
465 | continue; | |
466 | strbuf_addstr(&refname, de->d_name); | |
467 | strbuf_addstr(&path, de->d_name); | |
468 | if (stat(path.buf, &st) < 0) { | |
469 | ; /* silently ignore */ | |
470 | } else if (S_ISDIR(st.st_mode)) { | |
471 | strbuf_addch(&refname, '/'); | |
472 | add_entry_to_dir(dir, | |
e00d1a4f | 473 | create_dir_entry(dir->cache, refname.buf, |
7bd9bcf3 MH |
474 | refname.len, 1)); |
475 | } else { | |
7d2df051 | 476 | if (!refs_resolve_ref_unsafe(&refs->base, |
3c0cb0cb MH |
477 | refname.buf, |
478 | RESOLVE_REF_READING, | |
479 | sha1, &flag)) { | |
7bd9bcf3 MH |
480 | hashclr(sha1); |
481 | flag |= REF_ISBROKEN; | |
482 | } else if (is_null_sha1(sha1)) { | |
483 | /* | |
484 | * It is so astronomically unlikely | |
485 | * that NULL_SHA1 is the SHA-1 of an | |
486 | * actual object that we consider its | |
487 | * appearance in a loose reference | |
488 | * file to be repo corruption | |
489 | * (probably due to a software bug). | |
490 | */ | |
491 | flag |= REF_ISBROKEN; | |
492 | } | |
493 | ||
494 | if (check_refname_format(refname.buf, | |
495 | REFNAME_ALLOW_ONELEVEL)) { | |
496 | if (!refname_is_safe(refname.buf)) | |
497 | die("loose refname is dangerous: %s", refname.buf); | |
498 | hashclr(sha1); | |
499 | flag |= REF_BAD_NAME | REF_ISBROKEN; | |
500 | } | |
501 | add_entry_to_dir(dir, | |
502 | create_ref_entry(refname.buf, sha1, flag, 0)); | |
503 | } | |
504 | strbuf_setlen(&refname, dirnamelen); | |
505 | strbuf_setlen(&path, path_baselen); | |
506 | } | |
507 | strbuf_release(&refname); | |
508 | strbuf_release(&path); | |
509 | closedir(d); | |
e3bf2989 MH |
510 | |
511 | /* | |
512 | * Manually add refs/bisect, which, being per-worktree, might | |
513 | * not appear in the directory listing for refs/ in the main | |
514 | * repo. | |
515 | */ | |
516 | if (!strcmp(dirname, "refs/")) { | |
517 | int pos = search_ref_dir(dir, "refs/bisect/", 12); | |
518 | ||
519 | if (pos < 0) { | |
520 | struct ref_entry *child_entry = create_dir_entry( | |
521 | dir->cache, "refs/bisect/", 12, 1); | |
522 | add_entry_to_dir(dir, child_entry); | |
523 | } | |
524 | } | |
7bd9bcf3 MH |
525 | } |
526 | ||
a714b19c | 527 | static struct ref_cache *get_loose_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 MH |
528 | { |
529 | if (!refs->loose) { | |
530 | /* | |
531 | * Mark the top-level directory complete because we | |
532 | * are about to read the only subdirectory that can | |
533 | * hold references: | |
534 | */ | |
df308759 | 535 | refs->loose = create_ref_cache(&refs->base, loose_fill_ref_dir); |
7c22bc8a MH |
536 | |
537 | /* We're going to fill the top level ourselves: */ | |
538 | refs->loose->root->flag &= ~REF_INCOMPLETE; | |
539 | ||
7bd9bcf3 | 540 | /* |
7c22bc8a MH |
541 | * Add an incomplete entry for "refs/" (to be filled |
542 | * lazily): | |
7bd9bcf3 | 543 | */ |
7c22bc8a | 544 | add_entry_to_dir(get_ref_dir(refs->loose->root), |
e00d1a4f | 545 | create_dir_entry(refs->loose, "refs/", 5, 1)); |
7bd9bcf3 | 546 | } |
a714b19c MH |
547 | return refs->loose; |
548 | } | |
549 | ||
550 | static struct ref_dir *get_loose_ref_dir(struct files_ref_store *refs) | |
551 | { | |
552 | return get_ref_dir(get_loose_ref_cache(refs)->root); | |
7bd9bcf3 MH |
553 | } |
554 | ||
7bd9bcf3 MH |
555 | /* |
556 | * Return the ref_entry for the given refname from the packed | |
557 | * references. If it does not exist, return NULL. | |
558 | */ | |
f0d21efc MH |
559 | static struct ref_entry *get_packed_ref(struct files_ref_store *refs, |
560 | const char *refname) | |
7bd9bcf3 | 561 | { |
bc1c696e | 562 | return find_ref_entry(get_packed_refs(refs), refname); |
7bd9bcf3 MH |
563 | } |
564 | ||
565 | /* | |
419c6f4c | 566 | * A loose ref file doesn't exist; check for a packed ref. |
7bd9bcf3 | 567 | */ |
611118d0 MH |
568 | static int resolve_packed_ref(struct files_ref_store *refs, |
569 | const char *refname, | |
570 | unsigned char *sha1, unsigned int *flags) | |
7bd9bcf3 MH |
571 | { |
572 | struct ref_entry *entry; | |
573 | ||
574 | /* | |
575 | * The loose reference file does not exist; check for a packed | |
576 | * reference. | |
577 | */ | |
f0d21efc | 578 | entry = get_packed_ref(refs, refname); |
7bd9bcf3 MH |
579 | if (entry) { |
580 | hashcpy(sha1, entry->u.value.oid.hash); | |
a70a93b7 | 581 | *flags |= REF_ISPACKED; |
7bd9bcf3 MH |
582 | return 0; |
583 | } | |
419c6f4c MH |
584 | /* refname is not a packed reference. */ |
585 | return -1; | |
7bd9bcf3 MH |
586 | } |
587 | ||
e1e33b72 MH |
588 | static int files_read_raw_ref(struct ref_store *ref_store, |
589 | const char *refname, unsigned char *sha1, | |
590 | struct strbuf *referent, unsigned int *type) | |
7bd9bcf3 | 591 | { |
4308651c | 592 | struct files_ref_store *refs = |
9e7ec634 | 593 | files_downcast(ref_store, REF_STORE_READ, "read_raw_ref"); |
42a38cf7 MH |
594 | struct strbuf sb_contents = STRBUF_INIT; |
595 | struct strbuf sb_path = STRBUF_INIT; | |
7048653a DT |
596 | const char *path; |
597 | const char *buf; | |
598 | struct stat st; | |
599 | int fd; | |
42a38cf7 MH |
600 | int ret = -1; |
601 | int save_errno; | |
e8c42cb9 | 602 | int remaining_retries = 3; |
7bd9bcf3 | 603 | |
fa96ea1b | 604 | *type = 0; |
42a38cf7 | 605 | strbuf_reset(&sb_path); |
34c7ad8f | 606 | |
19e02f4f | 607 | files_ref_path(refs, &sb_path, refname); |
34c7ad8f | 608 | |
42a38cf7 | 609 | path = sb_path.buf; |
7bd9bcf3 | 610 | |
7048653a DT |
611 | stat_ref: |
612 | /* | |
613 | * We might have to loop back here to avoid a race | |
614 | * condition: first we lstat() the file, then we try | |
615 | * to read it as a link or as a file. But if somebody | |
616 | * changes the type of the file (file <-> directory | |
617 | * <-> symlink) between the lstat() and reading, then | |
618 | * we don't want to report that as an error but rather | |
619 | * try again starting with the lstat(). | |
e8c42cb9 JK |
620 | * |
621 | * We'll keep a count of the retries, though, just to avoid | |
622 | * any confusing situation sending us into an infinite loop. | |
7048653a | 623 | */ |
7bd9bcf3 | 624 | |
e8c42cb9 JK |
625 | if (remaining_retries-- <= 0) |
626 | goto out; | |
627 | ||
7048653a DT |
628 | if (lstat(path, &st) < 0) { |
629 | if (errno != ENOENT) | |
42a38cf7 | 630 | goto out; |
611118d0 | 631 | if (resolve_packed_ref(refs, refname, sha1, type)) { |
7048653a | 632 | errno = ENOENT; |
42a38cf7 | 633 | goto out; |
7bd9bcf3 | 634 | } |
42a38cf7 MH |
635 | ret = 0; |
636 | goto out; | |
7bd9bcf3 | 637 | } |
7bd9bcf3 | 638 | |
7048653a DT |
639 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
640 | if (S_ISLNK(st.st_mode)) { | |
42a38cf7 MH |
641 | strbuf_reset(&sb_contents); |
642 | if (strbuf_readlink(&sb_contents, path, 0) < 0) { | |
7048653a | 643 | if (errno == ENOENT || errno == EINVAL) |
7bd9bcf3 MH |
644 | /* inconsistent with lstat; retry */ |
645 | goto stat_ref; | |
646 | else | |
42a38cf7 | 647 | goto out; |
7bd9bcf3 | 648 | } |
42a38cf7 MH |
649 | if (starts_with(sb_contents.buf, "refs/") && |
650 | !check_refname_format(sb_contents.buf, 0)) { | |
92b38093 | 651 | strbuf_swap(&sb_contents, referent); |
3a0b6b9a | 652 | *type |= REF_ISSYMREF; |
42a38cf7 MH |
653 | ret = 0; |
654 | goto out; | |
7bd9bcf3 | 655 | } |
3f7bd767 JK |
656 | /* |
657 | * It doesn't look like a refname; fall through to just | |
658 | * treating it like a non-symlink, and reading whatever it | |
659 | * points to. | |
660 | */ | |
7048653a | 661 | } |
7bd9bcf3 | 662 | |
7048653a DT |
663 | /* Is it a directory? */ |
664 | if (S_ISDIR(st.st_mode)) { | |
e167a567 MH |
665 | /* |
666 | * Even though there is a directory where the loose | |
667 | * ref is supposed to be, there could still be a | |
668 | * packed ref: | |
669 | */ | |
611118d0 | 670 | if (resolve_packed_ref(refs, refname, sha1, type)) { |
e167a567 MH |
671 | errno = EISDIR; |
672 | goto out; | |
673 | } | |
674 | ret = 0; | |
42a38cf7 | 675 | goto out; |
7048653a DT |
676 | } |
677 | ||
678 | /* | |
679 | * Anything else, just open it and try to use it as | |
680 | * a ref | |
681 | */ | |
682 | fd = open(path, O_RDONLY); | |
683 | if (fd < 0) { | |
3f7bd767 | 684 | if (errno == ENOENT && !S_ISLNK(st.st_mode)) |
7048653a DT |
685 | /* inconsistent with lstat; retry */ |
686 | goto stat_ref; | |
687 | else | |
42a38cf7 | 688 | goto out; |
7048653a | 689 | } |
42a38cf7 MH |
690 | strbuf_reset(&sb_contents); |
691 | if (strbuf_read(&sb_contents, fd, 256) < 0) { | |
7048653a DT |
692 | int save_errno = errno; |
693 | close(fd); | |
694 | errno = save_errno; | |
42a38cf7 | 695 | goto out; |
7048653a DT |
696 | } |
697 | close(fd); | |
42a38cf7 MH |
698 | strbuf_rtrim(&sb_contents); |
699 | buf = sb_contents.buf; | |
7048653a DT |
700 | if (starts_with(buf, "ref:")) { |
701 | buf += 4; | |
7bd9bcf3 MH |
702 | while (isspace(*buf)) |
703 | buf++; | |
7048653a | 704 | |
92b38093 MH |
705 | strbuf_reset(referent); |
706 | strbuf_addstr(referent, buf); | |
3a0b6b9a | 707 | *type |= REF_ISSYMREF; |
42a38cf7 MH |
708 | ret = 0; |
709 | goto out; | |
7bd9bcf3 | 710 | } |
7bd9bcf3 | 711 | |
7048653a DT |
712 | /* |
713 | * Please note that FETCH_HEAD has additional | |
714 | * data after the sha. | |
715 | */ | |
716 | if (get_sha1_hex(buf, sha1) || | |
717 | (buf[40] != '\0' && !isspace(buf[40]))) { | |
3a0b6b9a | 718 | *type |= REF_ISBROKEN; |
7048653a | 719 | errno = EINVAL; |
42a38cf7 | 720 | goto out; |
7048653a DT |
721 | } |
722 | ||
42a38cf7 | 723 | ret = 0; |
7bd9bcf3 | 724 | |
42a38cf7 MH |
725 | out: |
726 | save_errno = errno; | |
7bd9bcf3 MH |
727 | strbuf_release(&sb_path); |
728 | strbuf_release(&sb_contents); | |
42a38cf7 | 729 | errno = save_errno; |
7bd9bcf3 MH |
730 | return ret; |
731 | } | |
732 | ||
8415d247 MH |
733 | static void unlock_ref(struct ref_lock *lock) |
734 | { | |
735 | /* Do not free lock->lk -- atexit() still looks at them */ | |
736 | if (lock->lk) | |
737 | rollback_lock_file(lock->lk); | |
738 | free(lock->ref_name); | |
8415d247 MH |
739 | free(lock); |
740 | } | |
741 | ||
92b1551b MH |
742 | /* |
743 | * Lock refname, without following symrefs, and set *lock_p to point | |
744 | * at a newly-allocated lock object. Fill in lock->old_oid, referent, | |
745 | * and type similarly to read_raw_ref(). | |
746 | * | |
747 | * The caller must verify that refname is a "safe" reference name (in | |
748 | * the sense of refname_is_safe()) before calling this function. | |
749 | * | |
750 | * If the reference doesn't already exist, verify that refname doesn't | |
751 | * have a D/F conflict with any existing references. extras and skip | |
524a9fdb | 752 | * are passed to refs_verify_refname_available() for this check. |
92b1551b MH |
753 | * |
754 | * If mustexist is not set and the reference is not found or is | |
755 | * broken, lock the reference anyway but clear sha1. | |
756 | * | |
757 | * Return 0 on success. On failure, write an error message to err and | |
758 | * return TRANSACTION_NAME_CONFLICT or TRANSACTION_GENERIC_ERROR. | |
759 | * | |
760 | * Implementation note: This function is basically | |
761 | * | |
762 | * lock reference | |
763 | * read_raw_ref() | |
764 | * | |
765 | * but it includes a lot more code to | |
766 | * - Deal with possible races with other processes | |
524a9fdb | 767 | * - Avoid calling refs_verify_refname_available() when it can be |
92b1551b MH |
768 | * avoided, namely if we were successfully able to read the ref |
769 | * - Generate informative error messages in the case of failure | |
770 | */ | |
f7b0a987 MH |
771 | static int lock_raw_ref(struct files_ref_store *refs, |
772 | const char *refname, int mustexist, | |
92b1551b MH |
773 | const struct string_list *extras, |
774 | const struct string_list *skip, | |
775 | struct ref_lock **lock_p, | |
776 | struct strbuf *referent, | |
777 | unsigned int *type, | |
778 | struct strbuf *err) | |
779 | { | |
780 | struct ref_lock *lock; | |
781 | struct strbuf ref_file = STRBUF_INIT; | |
782 | int attempts_remaining = 3; | |
783 | int ret = TRANSACTION_GENERIC_ERROR; | |
784 | ||
785 | assert(err); | |
32c597e7 | 786 | files_assert_main_repository(refs, "lock_raw_ref"); |
f7b0a987 | 787 | |
92b1551b MH |
788 | *type = 0; |
789 | ||
790 | /* First lock the file so it can't change out from under us. */ | |
791 | ||
792 | *lock_p = lock = xcalloc(1, sizeof(*lock)); | |
793 | ||
794 | lock->ref_name = xstrdup(refname); | |
19e02f4f | 795 | files_ref_path(refs, &ref_file, refname); |
92b1551b MH |
796 | |
797 | retry: | |
798 | switch (safe_create_leading_directories(ref_file.buf)) { | |
799 | case SCLD_OK: | |
800 | break; /* success */ | |
801 | case SCLD_EXISTS: | |
802 | /* | |
803 | * Suppose refname is "refs/foo/bar". We just failed | |
804 | * to create the containing directory, "refs/foo", | |
805 | * because there was a non-directory in the way. This | |
806 | * indicates a D/F conflict, probably because of | |
807 | * another reference such as "refs/foo". There is no | |
808 | * reason to expect this error to be transitory. | |
809 | */ | |
7d2df051 NTND |
810 | if (refs_verify_refname_available(&refs->base, refname, |
811 | extras, skip, err)) { | |
92b1551b MH |
812 | if (mustexist) { |
813 | /* | |
814 | * To the user the relevant error is | |
815 | * that the "mustexist" reference is | |
816 | * missing: | |
817 | */ | |
818 | strbuf_reset(err); | |
819 | strbuf_addf(err, "unable to resolve reference '%s'", | |
820 | refname); | |
821 | } else { | |
822 | /* | |
823 | * The error message set by | |
524a9fdb MH |
824 | * refs_verify_refname_available() is |
825 | * OK. | |
92b1551b MH |
826 | */ |
827 | ret = TRANSACTION_NAME_CONFLICT; | |
828 | } | |
829 | } else { | |
830 | /* | |
831 | * The file that is in the way isn't a loose | |
832 | * reference. Report it as a low-level | |
833 | * failure. | |
834 | */ | |
835 | strbuf_addf(err, "unable to create lock file %s.lock; " | |
836 | "non-directory in the way", | |
837 | ref_file.buf); | |
838 | } | |
839 | goto error_return; | |
840 | case SCLD_VANISHED: | |
841 | /* Maybe another process was tidying up. Try again. */ | |
842 | if (--attempts_remaining > 0) | |
843 | goto retry; | |
844 | /* fall through */ | |
845 | default: | |
846 | strbuf_addf(err, "unable to create directory for %s", | |
847 | ref_file.buf); | |
848 | goto error_return; | |
849 | } | |
850 | ||
851 | if (!lock->lk) | |
852 | lock->lk = xcalloc(1, sizeof(struct lock_file)); | |
853 | ||
854 | if (hold_lock_file_for_update(lock->lk, ref_file.buf, LOCK_NO_DEREF) < 0) { | |
855 | if (errno == ENOENT && --attempts_remaining > 0) { | |
856 | /* | |
857 | * Maybe somebody just deleted one of the | |
858 | * directories leading to ref_file. Try | |
859 | * again: | |
860 | */ | |
861 | goto retry; | |
862 | } else { | |
863 | unable_to_lock_message(ref_file.buf, errno, err); | |
864 | goto error_return; | |
865 | } | |
866 | } | |
867 | ||
868 | /* | |
869 | * Now we hold the lock and can read the reference without | |
870 | * fear that its value will change. | |
871 | */ | |
872 | ||
f7b0a987 | 873 | if (files_read_raw_ref(&refs->base, refname, |
e1e33b72 | 874 | lock->old_oid.hash, referent, type)) { |
92b1551b MH |
875 | if (errno == ENOENT) { |
876 | if (mustexist) { | |
877 | /* Garden variety missing reference. */ | |
878 | strbuf_addf(err, "unable to resolve reference '%s'", | |
879 | refname); | |
880 | goto error_return; | |
881 | } else { | |
882 | /* | |
883 | * Reference is missing, but that's OK. We | |
884 | * know that there is not a conflict with | |
885 | * another loose reference because | |
886 | * (supposing that we are trying to lock | |
887 | * reference "refs/foo/bar"): | |
888 | * | |
889 | * - We were successfully able to create | |
890 | * the lockfile refs/foo/bar.lock, so we | |
891 | * know there cannot be a loose reference | |
892 | * named "refs/foo". | |
893 | * | |
894 | * - We got ENOENT and not EISDIR, so we | |
895 | * know that there cannot be a loose | |
896 | * reference named "refs/foo/bar/baz". | |
897 | */ | |
898 | } | |
899 | } else if (errno == EISDIR) { | |
900 | /* | |
901 | * There is a directory in the way. It might have | |
902 | * contained references that have been deleted. If | |
903 | * we don't require that the reference already | |
904 | * exists, try to remove the directory so that it | |
905 | * doesn't cause trouble when we want to rename the | |
906 | * lockfile into place later. | |
907 | */ | |
908 | if (mustexist) { | |
909 | /* Garden variety missing reference. */ | |
910 | strbuf_addf(err, "unable to resolve reference '%s'", | |
911 | refname); | |
912 | goto error_return; | |
913 | } else if (remove_dir_recursively(&ref_file, | |
914 | REMOVE_DIR_EMPTY_ONLY)) { | |
b05855b5 MH |
915 | if (refs_verify_refname_available( |
916 | &refs->base, refname, | |
917 | extras, skip, err)) { | |
92b1551b MH |
918 | /* |
919 | * The error message set by | |
920 | * verify_refname_available() is OK. | |
921 | */ | |
922 | ret = TRANSACTION_NAME_CONFLICT; | |
923 | goto error_return; | |
924 | } else { | |
925 | /* | |
926 | * We can't delete the directory, | |
927 | * but we also don't know of any | |
928 | * references that it should | |
929 | * contain. | |
930 | */ | |
931 | strbuf_addf(err, "there is a non-empty directory '%s' " | |
932 | "blocking reference '%s'", | |
933 | ref_file.buf, refname); | |
934 | goto error_return; | |
935 | } | |
936 | } | |
937 | } else if (errno == EINVAL && (*type & REF_ISBROKEN)) { | |
938 | strbuf_addf(err, "unable to resolve reference '%s': " | |
939 | "reference broken", refname); | |
940 | goto error_return; | |
941 | } else { | |
942 | strbuf_addf(err, "unable to resolve reference '%s': %s", | |
943 | refname, strerror(errno)); | |
944 | goto error_return; | |
945 | } | |
946 | ||
947 | /* | |
948 | * If the ref did not exist and we are creating it, | |
524a9fdb MH |
949 | * make sure there is no existing ref that conflicts |
950 | * with refname: | |
92b1551b | 951 | */ |
524a9fdb MH |
952 | if (refs_verify_refname_available( |
953 | &refs->base, refname, | |
954 | extras, skip, err)) | |
92b1551b | 955 | goto error_return; |
92b1551b MH |
956 | } |
957 | ||
958 | ret = 0; | |
959 | goto out; | |
960 | ||
961 | error_return: | |
962 | unlock_ref(lock); | |
963 | *lock_p = NULL; | |
964 | ||
965 | out: | |
966 | strbuf_release(&ref_file); | |
967 | return ret; | |
968 | } | |
969 | ||
bd427cf2 MH |
970 | static int files_peel_ref(struct ref_store *ref_store, |
971 | const char *refname, unsigned char *sha1) | |
7bd9bcf3 | 972 | { |
9e7ec634 NTND |
973 | struct files_ref_store *refs = |
974 | files_downcast(ref_store, REF_STORE_READ | REF_STORE_ODB, | |
975 | "peel_ref"); | |
7bd9bcf3 MH |
976 | int flag; |
977 | unsigned char base[20]; | |
978 | ||
4c4de895 MH |
979 | if (current_ref_iter && current_ref_iter->refname == refname) { |
980 | struct object_id peeled; | |
981 | ||
982 | if (ref_iterator_peel(current_ref_iter, &peeled)) | |
7bd9bcf3 | 983 | return -1; |
4c4de895 | 984 | hashcpy(sha1, peeled.hash); |
7bd9bcf3 MH |
985 | return 0; |
986 | } | |
987 | ||
2f40e954 NTND |
988 | if (refs_read_ref_full(ref_store, refname, |
989 | RESOLVE_REF_READING, base, &flag)) | |
7bd9bcf3 MH |
990 | return -1; |
991 | ||
992 | /* | |
993 | * If the reference is packed, read its ref_entry from the | |
994 | * cache in the hope that we already know its peeled value. | |
995 | * We only try this optimization on packed references because | |
996 | * (a) forcing the filling of the loose reference cache could | |
997 | * be expensive and (b) loose references anyway usually do not | |
998 | * have REF_KNOWS_PEELED. | |
999 | */ | |
1000 | if (flag & REF_ISPACKED) { | |
f0d21efc | 1001 | struct ref_entry *r = get_packed_ref(refs, refname); |
7bd9bcf3 MH |
1002 | if (r) { |
1003 | if (peel_entry(r, 0)) | |
1004 | return -1; | |
1005 | hashcpy(sha1, r->u.value.peeled.hash); | |
1006 | return 0; | |
1007 | } | |
1008 | } | |
1009 | ||
1010 | return peel_object(base, sha1); | |
1011 | } | |
1012 | ||
3bc581b9 MH |
1013 | struct files_ref_iterator { |
1014 | struct ref_iterator base; | |
1015 | ||
7bd9bcf3 | 1016 | struct packed_ref_cache *packed_ref_cache; |
3bc581b9 MH |
1017 | struct ref_iterator *iter0; |
1018 | unsigned int flags; | |
1019 | }; | |
7bd9bcf3 | 1020 | |
3bc581b9 MH |
1021 | static int files_ref_iterator_advance(struct ref_iterator *ref_iterator) |
1022 | { | |
1023 | struct files_ref_iterator *iter = | |
1024 | (struct files_ref_iterator *)ref_iterator; | |
1025 | int ok; | |
7bd9bcf3 | 1026 | |
3bc581b9 | 1027 | while ((ok = ref_iterator_advance(iter->iter0)) == ITER_OK) { |
0c09ec07 DT |
1028 | if (iter->flags & DO_FOR_EACH_PER_WORKTREE_ONLY && |
1029 | ref_type(iter->iter0->refname) != REF_TYPE_PER_WORKTREE) | |
1030 | continue; | |
1031 | ||
3bc581b9 MH |
1032 | if (!(iter->flags & DO_FOR_EACH_INCLUDE_BROKEN) && |
1033 | !ref_resolves_to_object(iter->iter0->refname, | |
1034 | iter->iter0->oid, | |
1035 | iter->iter0->flags)) | |
1036 | continue; | |
1037 | ||
1038 | iter->base.refname = iter->iter0->refname; | |
1039 | iter->base.oid = iter->iter0->oid; | |
1040 | iter->base.flags = iter->iter0->flags; | |
1041 | return ITER_OK; | |
7bd9bcf3 MH |
1042 | } |
1043 | ||
3bc581b9 MH |
1044 | iter->iter0 = NULL; |
1045 | if (ref_iterator_abort(ref_iterator) != ITER_DONE) | |
1046 | ok = ITER_ERROR; | |
1047 | ||
1048 | return ok; | |
7bd9bcf3 MH |
1049 | } |
1050 | ||
3bc581b9 MH |
1051 | static int files_ref_iterator_peel(struct ref_iterator *ref_iterator, |
1052 | struct object_id *peeled) | |
7bd9bcf3 | 1053 | { |
3bc581b9 MH |
1054 | struct files_ref_iterator *iter = |
1055 | (struct files_ref_iterator *)ref_iterator; | |
93770590 | 1056 | |
3bc581b9 MH |
1057 | return ref_iterator_peel(iter->iter0, peeled); |
1058 | } | |
1059 | ||
1060 | static int files_ref_iterator_abort(struct ref_iterator *ref_iterator) | |
1061 | { | |
1062 | struct files_ref_iterator *iter = | |
1063 | (struct files_ref_iterator *)ref_iterator; | |
1064 | int ok = ITER_DONE; | |
1065 | ||
1066 | if (iter->iter0) | |
1067 | ok = ref_iterator_abort(iter->iter0); | |
1068 | ||
1069 | release_packed_ref_cache(iter->packed_ref_cache); | |
1070 | base_ref_iterator_free(ref_iterator); | |
1071 | return ok; | |
1072 | } | |
1073 | ||
1074 | static struct ref_iterator_vtable files_ref_iterator_vtable = { | |
1075 | files_ref_iterator_advance, | |
1076 | files_ref_iterator_peel, | |
1077 | files_ref_iterator_abort | |
1078 | }; | |
1079 | ||
1a769003 | 1080 | static struct ref_iterator *files_ref_iterator_begin( |
37b6f6d5 | 1081 | struct ref_store *ref_store, |
3bc581b9 MH |
1082 | const char *prefix, unsigned int flags) |
1083 | { | |
9e7ec634 | 1084 | struct files_ref_store *refs; |
3bc581b9 MH |
1085 | struct ref_iterator *loose_iter, *packed_iter; |
1086 | struct files_ref_iterator *iter; | |
1087 | struct ref_iterator *ref_iterator; | |
1088 | ||
7bd9bcf3 MH |
1089 | if (ref_paranoia < 0) |
1090 | ref_paranoia = git_env_bool("GIT_REF_PARANOIA", 0); | |
1091 | if (ref_paranoia) | |
3bc581b9 MH |
1092 | flags |= DO_FOR_EACH_INCLUDE_BROKEN; |
1093 | ||
9e7ec634 NTND |
1094 | refs = files_downcast(ref_store, |
1095 | REF_STORE_READ | (ref_paranoia ? 0 : REF_STORE_ODB), | |
1096 | "ref_iterator_begin"); | |
1097 | ||
3bc581b9 MH |
1098 | iter = xcalloc(1, sizeof(*iter)); |
1099 | ref_iterator = &iter->base; | |
1100 | base_ref_iterator_init(ref_iterator, &files_ref_iterator_vtable); | |
1101 | ||
1102 | /* | |
1103 | * We must make sure that all loose refs are read before | |
1104 | * accessing the packed-refs file; this avoids a race | |
1105 | * condition if loose refs are migrated to the packed-refs | |
1106 | * file by a simultaneous process, but our in-memory view is | |
1107 | * from before the migration. We ensure this as follows: | |
059ae35a MH |
1108 | * First, we call start the loose refs iteration with its |
1109 | * `prime_ref` argument set to true. This causes the loose | |
1110 | * references in the subtree to be pre-read into the cache. | |
1111 | * (If they've already been read, that's OK; we only need to | |
1112 | * guarantee that they're read before the packed refs, not | |
1113 | * *how much* before.) After that, we call | |
1114 | * get_packed_ref_cache(), which internally checks whether the | |
1115 | * packed-ref cache is up to date with what is on disk, and | |
1116 | * re-reads it if not. | |
3bc581b9 MH |
1117 | */ |
1118 | ||
059ae35a MH |
1119 | loose_iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), |
1120 | prefix, 1); | |
3bc581b9 MH |
1121 | |
1122 | iter->packed_ref_cache = get_packed_ref_cache(refs); | |
1123 | acquire_packed_ref_cache(iter->packed_ref_cache); | |
059ae35a MH |
1124 | packed_iter = cache_ref_iterator_begin(iter->packed_ref_cache->cache, |
1125 | prefix, 0); | |
3bc581b9 MH |
1126 | |
1127 | iter->iter0 = overlay_ref_iterator_begin(loose_iter, packed_iter); | |
1128 | iter->flags = flags; | |
1129 | ||
1130 | return ref_iterator; | |
7bd9bcf3 MH |
1131 | } |
1132 | ||
7bd9bcf3 MH |
1133 | /* |
1134 | * Verify that the reference locked by lock has the value old_sha1. | |
1135 | * Fail if the reference doesn't exist and mustexist is set. Return 0 | |
1136 | * on success. On error, write an error message to err, set errno, and | |
1137 | * return a negative value. | |
1138 | */ | |
2f40e954 | 1139 | static int verify_lock(struct ref_store *ref_store, struct ref_lock *lock, |
7bd9bcf3 MH |
1140 | const unsigned char *old_sha1, int mustexist, |
1141 | struct strbuf *err) | |
1142 | { | |
1143 | assert(err); | |
1144 | ||
2f40e954 NTND |
1145 | if (refs_read_ref_full(ref_store, lock->ref_name, |
1146 | mustexist ? RESOLVE_REF_READING : 0, | |
1147 | lock->old_oid.hash, NULL)) { | |
6294dcb4 JK |
1148 | if (old_sha1) { |
1149 | int save_errno = errno; | |
0568c8e9 | 1150 | strbuf_addf(err, "can't verify ref '%s'", lock->ref_name); |
6294dcb4 JK |
1151 | errno = save_errno; |
1152 | return -1; | |
1153 | } else { | |
c368dde9 | 1154 | oidclr(&lock->old_oid); |
6294dcb4 JK |
1155 | return 0; |
1156 | } | |
7bd9bcf3 | 1157 | } |
6294dcb4 | 1158 | if (old_sha1 && hashcmp(lock->old_oid.hash, old_sha1)) { |
0568c8e9 | 1159 | strbuf_addf(err, "ref '%s' is at %s but expected %s", |
7bd9bcf3 | 1160 | lock->ref_name, |
c368dde9 | 1161 | oid_to_hex(&lock->old_oid), |
7bd9bcf3 MH |
1162 | sha1_to_hex(old_sha1)); |
1163 | errno = EBUSY; | |
1164 | return -1; | |
1165 | } | |
1166 | return 0; | |
1167 | } | |
1168 | ||
1169 | static int remove_empty_directories(struct strbuf *path) | |
1170 | { | |
1171 | /* | |
1172 | * we want to create a file but there is a directory there; | |
1173 | * if that is an empty directory (or a directory that contains | |
1174 | * only empty directories), remove them. | |
1175 | */ | |
1176 | return remove_dir_recursively(path, REMOVE_DIR_EMPTY_ONLY); | |
1177 | } | |
1178 | ||
3b5d3c98 MH |
1179 | static int create_reflock(const char *path, void *cb) |
1180 | { | |
1181 | struct lock_file *lk = cb; | |
1182 | ||
1183 | return hold_lock_file_for_update(lk, path, LOCK_NO_DEREF) < 0 ? -1 : 0; | |
1184 | } | |
1185 | ||
7bd9bcf3 MH |
1186 | /* |
1187 | * Locks a ref returning the lock on success and NULL on failure. | |
1188 | * On failure errno is set to something meaningful. | |
1189 | */ | |
7eb27cdf MH |
1190 | static struct ref_lock *lock_ref_sha1_basic(struct files_ref_store *refs, |
1191 | const char *refname, | |
7bd9bcf3 MH |
1192 | const unsigned char *old_sha1, |
1193 | const struct string_list *extras, | |
1194 | const struct string_list *skip, | |
bcb497d0 | 1195 | unsigned int flags, int *type, |
7bd9bcf3 MH |
1196 | struct strbuf *err) |
1197 | { | |
1198 | struct strbuf ref_file = STRBUF_INIT; | |
7bd9bcf3 MH |
1199 | struct ref_lock *lock; |
1200 | int last_errno = 0; | |
7bd9bcf3 | 1201 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
7a418f3a | 1202 | int resolve_flags = RESOLVE_REF_NO_RECURSE; |
7a418f3a | 1203 | int resolved; |
7bd9bcf3 | 1204 | |
32c597e7 | 1205 | files_assert_main_repository(refs, "lock_ref_sha1_basic"); |
7bd9bcf3 MH |
1206 | assert(err); |
1207 | ||
1208 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
1209 | ||
1210 | if (mustexist) | |
1211 | resolve_flags |= RESOLVE_REF_READING; | |
2859dcd4 | 1212 | if (flags & REF_DELETING) |
7bd9bcf3 | 1213 | resolve_flags |= RESOLVE_REF_ALLOW_BAD_NAME; |
7bd9bcf3 | 1214 | |
19e02f4f | 1215 | files_ref_path(refs, &ref_file, refname); |
2f40e954 NTND |
1216 | resolved = !!refs_resolve_ref_unsafe(&refs->base, |
1217 | refname, resolve_flags, | |
1218 | lock->old_oid.hash, type); | |
7a418f3a | 1219 | if (!resolved && errno == EISDIR) { |
7bd9bcf3 MH |
1220 | /* |
1221 | * we are trying to lock foo but we used to | |
1222 | * have foo/bar which now does not exist; | |
1223 | * it is normal for the empty directory 'foo' | |
1224 | * to remain. | |
1225 | */ | |
7a418f3a | 1226 | if (remove_empty_directories(&ref_file)) { |
7bd9bcf3 | 1227 | last_errno = errno; |
b05855b5 MH |
1228 | if (!refs_verify_refname_available( |
1229 | &refs->base, | |
1230 | refname, extras, skip, err)) | |
7bd9bcf3 | 1231 | strbuf_addf(err, "there are still refs under '%s'", |
7a418f3a | 1232 | refname); |
7bd9bcf3 MH |
1233 | goto error_return; |
1234 | } | |
2f40e954 NTND |
1235 | resolved = !!refs_resolve_ref_unsafe(&refs->base, |
1236 | refname, resolve_flags, | |
1237 | lock->old_oid.hash, type); | |
7bd9bcf3 | 1238 | } |
7a418f3a | 1239 | if (!resolved) { |
7bd9bcf3 MH |
1240 | last_errno = errno; |
1241 | if (last_errno != ENOTDIR || | |
b05855b5 MH |
1242 | !refs_verify_refname_available(&refs->base, refname, |
1243 | extras, skip, err)) | |
0568c8e9 | 1244 | strbuf_addf(err, "unable to resolve reference '%s': %s", |
7a418f3a | 1245 | refname, strerror(last_errno)); |
7bd9bcf3 MH |
1246 | |
1247 | goto error_return; | |
1248 | } | |
2859dcd4 | 1249 | |
7bd9bcf3 MH |
1250 | /* |
1251 | * If the ref did not exist and we are creating it, make sure | |
1252 | * there is no existing packed ref whose name begins with our | |
1253 | * refname, nor a packed ref whose name is a proper prefix of | |
1254 | * our refname. | |
1255 | */ | |
1256 | if (is_null_oid(&lock->old_oid) && | |
524a9fdb MH |
1257 | refs_verify_refname_available(&refs->base, refname, |
1258 | extras, skip, err)) { | |
7bd9bcf3 MH |
1259 | last_errno = ENOTDIR; |
1260 | goto error_return; | |
1261 | } | |
1262 | ||
1263 | lock->lk = xcalloc(1, sizeof(struct lock_file)); | |
1264 | ||
7bd9bcf3 | 1265 | lock->ref_name = xstrdup(refname); |
7bd9bcf3 | 1266 | |
3b5d3c98 | 1267 | if (raceproof_create_file(ref_file.buf, create_reflock, lock->lk)) { |
7bd9bcf3 | 1268 | last_errno = errno; |
3b5d3c98 | 1269 | unable_to_lock_message(ref_file.buf, errno, err); |
7bd9bcf3 MH |
1270 | goto error_return; |
1271 | } | |
1272 | ||
2f40e954 | 1273 | if (verify_lock(&refs->base, lock, old_sha1, mustexist, err)) { |
7bd9bcf3 MH |
1274 | last_errno = errno; |
1275 | goto error_return; | |
1276 | } | |
1277 | goto out; | |
1278 | ||
1279 | error_return: | |
1280 | unlock_ref(lock); | |
1281 | lock = NULL; | |
1282 | ||
1283 | out: | |
1284 | strbuf_release(&ref_file); | |
7bd9bcf3 MH |
1285 | errno = last_errno; |
1286 | return lock; | |
1287 | } | |
1288 | ||
1289 | /* | |
1290 | * Write an entry to the packed-refs file for the specified refname. | |
1291 | * If peeled is non-NULL, write it as the entry's peeled value. | |
1292 | */ | |
1293 | static void write_packed_entry(FILE *fh, char *refname, unsigned char *sha1, | |
1294 | unsigned char *peeled) | |
1295 | { | |
1296 | fprintf_or_die(fh, "%s %s\n", sha1_to_hex(sha1), refname); | |
1297 | if (peeled) | |
1298 | fprintf_or_die(fh, "^%s\n", sha1_to_hex(peeled)); | |
1299 | } | |
1300 | ||
1301 | /* | |
1302 | * An each_ref_entry_fn that writes the entry to a packed-refs file. | |
1303 | */ | |
1304 | static int write_packed_entry_fn(struct ref_entry *entry, void *cb_data) | |
1305 | { | |
1306 | enum peel_status peel_status = peel_entry(entry, 0); | |
1307 | ||
1308 | if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG) | |
1309 | error("internal error: %s is not a valid packed reference!", | |
1310 | entry->name); | |
1311 | write_packed_entry(cb_data, entry->name, entry->u.value.oid.hash, | |
1312 | peel_status == PEEL_PEELED ? | |
1313 | entry->u.value.peeled.hash : NULL); | |
1314 | return 0; | |
1315 | } | |
1316 | ||
1317 | /* | |
1318 | * Lock the packed-refs file for writing. Flags is passed to | |
1319 | * hold_lock_file_for_update(). Return 0 on success. On errors, set | |
1320 | * errno appropriately and return a nonzero value. | |
1321 | */ | |
49c0df6a | 1322 | static int lock_packed_refs(struct files_ref_store *refs, int flags) |
7bd9bcf3 MH |
1323 | { |
1324 | static int timeout_configured = 0; | |
1325 | static int timeout_value = 1000; | |
7bd9bcf3 MH |
1326 | struct packed_ref_cache *packed_ref_cache; |
1327 | ||
32c597e7 | 1328 | files_assert_main_repository(refs, "lock_packed_refs"); |
49c0df6a | 1329 | |
7bd9bcf3 MH |
1330 | if (!timeout_configured) { |
1331 | git_config_get_int("core.packedrefstimeout", &timeout_value); | |
1332 | timeout_configured = 1; | |
1333 | } | |
1334 | ||
1335 | if (hold_lock_file_for_update_timeout( | |
33dfb9f3 | 1336 | &packlock, files_packed_refs_path(refs), |
7bd9bcf3 MH |
1337 | flags, timeout_value) < 0) |
1338 | return -1; | |
1339 | /* | |
1340 | * Get the current packed-refs while holding the lock. If the | |
1341 | * packed-refs file has been modified since we last read it, | |
1342 | * this will automatically invalidate the cache and re-read | |
1343 | * the packed-refs file. | |
1344 | */ | |
00eebe35 | 1345 | packed_ref_cache = get_packed_ref_cache(refs); |
7bd9bcf3 MH |
1346 | packed_ref_cache->lock = &packlock; |
1347 | /* Increment the reference count to prevent it from being freed: */ | |
1348 | acquire_packed_ref_cache(packed_ref_cache); | |
1349 | return 0; | |
1350 | } | |
1351 | ||
1352 | /* | |
1353 | * Write the current version of the packed refs cache from memory to | |
1354 | * disk. The packed-refs file must already be locked for writing (see | |
1355 | * lock_packed_refs()). Return zero on success. On errors, set errno | |
1356 | * and return a nonzero value | |
1357 | */ | |
49c0df6a | 1358 | static int commit_packed_refs(struct files_ref_store *refs) |
7bd9bcf3 MH |
1359 | { |
1360 | struct packed_ref_cache *packed_ref_cache = | |
00eebe35 | 1361 | get_packed_ref_cache(refs); |
7bd9bcf3 MH |
1362 | int error = 0; |
1363 | int save_errno = 0; | |
1364 | FILE *out; | |
1365 | ||
32c597e7 | 1366 | files_assert_main_repository(refs, "commit_packed_refs"); |
49c0df6a | 1367 | |
7bd9bcf3 MH |
1368 | if (!packed_ref_cache->lock) |
1369 | die("internal error: packed-refs not locked"); | |
1370 | ||
1371 | out = fdopen_lock_file(packed_ref_cache->lock, "w"); | |
1372 | if (!out) | |
1373 | die_errno("unable to fdopen packed-refs descriptor"); | |
1374 | ||
1375 | fprintf_or_die(out, "%s", PACKED_REFS_HEADER); | |
1376 | do_for_each_entry_in_dir(get_packed_ref_dir(packed_ref_cache), | |
5c7bba77 | 1377 | write_packed_entry_fn, out); |
7bd9bcf3 MH |
1378 | |
1379 | if (commit_lock_file(packed_ref_cache->lock)) { | |
1380 | save_errno = errno; | |
1381 | error = -1; | |
1382 | } | |
1383 | packed_ref_cache->lock = NULL; | |
1384 | release_packed_ref_cache(packed_ref_cache); | |
1385 | errno = save_errno; | |
1386 | return error; | |
1387 | } | |
1388 | ||
1389 | /* | |
1390 | * Rollback the lockfile for the packed-refs file, and discard the | |
1391 | * in-memory packed reference cache. (The packed-refs file will be | |
1392 | * read anew if it is needed again after this function is called.) | |
1393 | */ | |
49c0df6a | 1394 | static void rollback_packed_refs(struct files_ref_store *refs) |
7bd9bcf3 MH |
1395 | { |
1396 | struct packed_ref_cache *packed_ref_cache = | |
00eebe35 | 1397 | get_packed_ref_cache(refs); |
7bd9bcf3 | 1398 | |
32c597e7 | 1399 | files_assert_main_repository(refs, "rollback_packed_refs"); |
7bd9bcf3 MH |
1400 | |
1401 | if (!packed_ref_cache->lock) | |
1402 | die("internal error: packed-refs not locked"); | |
1403 | rollback_lock_file(packed_ref_cache->lock); | |
1404 | packed_ref_cache->lock = NULL; | |
1405 | release_packed_ref_cache(packed_ref_cache); | |
00eebe35 | 1406 | clear_packed_ref_cache(refs); |
7bd9bcf3 MH |
1407 | } |
1408 | ||
1409 | struct ref_to_prune { | |
1410 | struct ref_to_prune *next; | |
1411 | unsigned char sha1[20]; | |
1412 | char name[FLEX_ARRAY]; | |
1413 | }; | |
1414 | ||
1415 | struct pack_refs_cb_data { | |
1416 | unsigned int flags; | |
1417 | struct ref_dir *packed_refs; | |
1418 | struct ref_to_prune *ref_to_prune; | |
1419 | }; | |
1420 | ||
1421 | /* | |
1422 | * An each_ref_entry_fn that is run over loose references only. If | |
1423 | * the loose reference can be packed, add an entry in the packed ref | |
1424 | * cache. If the reference should be pruned, also add it to | |
1425 | * ref_to_prune in the pack_refs_cb_data. | |
1426 | */ | |
1427 | static int pack_if_possible_fn(struct ref_entry *entry, void *cb_data) | |
1428 | { | |
1429 | struct pack_refs_cb_data *cb = cb_data; | |
1430 | enum peel_status peel_status; | |
1431 | struct ref_entry *packed_entry; | |
1432 | int is_tag_ref = starts_with(entry->name, "refs/tags/"); | |
1433 | ||
1434 | /* Do not pack per-worktree refs: */ | |
1435 | if (ref_type(entry->name) != REF_TYPE_NORMAL) | |
1436 | return 0; | |
1437 | ||
1438 | /* ALWAYS pack tags */ | |
1439 | if (!(cb->flags & PACK_REFS_ALL) && !is_tag_ref) | |
1440 | return 0; | |
1441 | ||
1442 | /* Do not pack symbolic or broken refs: */ | |
ffeef642 | 1443 | if ((entry->flag & REF_ISSYMREF) || !entry_resolves_to_object(entry)) |
7bd9bcf3 MH |
1444 | return 0; |
1445 | ||
1446 | /* Add a packed ref cache entry equivalent to the loose entry. */ | |
1447 | peel_status = peel_entry(entry, 1); | |
1448 | if (peel_status != PEEL_PEELED && peel_status != PEEL_NON_TAG) | |
1449 | die("internal error peeling reference %s (%s)", | |
1450 | entry->name, oid_to_hex(&entry->u.value.oid)); | |
bc1c696e | 1451 | packed_entry = find_ref_entry(cb->packed_refs, entry->name); |
7bd9bcf3 MH |
1452 | if (packed_entry) { |
1453 | /* Overwrite existing packed entry with info from loose entry */ | |
1454 | packed_entry->flag = REF_ISPACKED | REF_KNOWS_PEELED; | |
1455 | oidcpy(&packed_entry->u.value.oid, &entry->u.value.oid); | |
1456 | } else { | |
1457 | packed_entry = create_ref_entry(entry->name, entry->u.value.oid.hash, | |
1458 | REF_ISPACKED | REF_KNOWS_PEELED, 0); | |
a3ade2ba | 1459 | add_ref_entry(cb->packed_refs, packed_entry); |
7bd9bcf3 MH |
1460 | } |
1461 | oidcpy(&packed_entry->u.value.peeled, &entry->u.value.peeled); | |
1462 | ||
1463 | /* Schedule the loose reference for pruning if requested. */ | |
1464 | if ((cb->flags & PACK_REFS_PRUNE)) { | |
96ffc06f JK |
1465 | struct ref_to_prune *n; |
1466 | FLEX_ALLOC_STR(n, name, entry->name); | |
7bd9bcf3 | 1467 | hashcpy(n->sha1, entry->u.value.oid.hash); |
7bd9bcf3 MH |
1468 | n->next = cb->ref_to_prune; |
1469 | cb->ref_to_prune = n; | |
1470 | } | |
1471 | return 0; | |
1472 | } | |
1473 | ||
a8f0db2d MH |
1474 | enum { |
1475 | REMOVE_EMPTY_PARENTS_REF = 0x01, | |
1476 | REMOVE_EMPTY_PARENTS_REFLOG = 0x02 | |
1477 | }; | |
1478 | ||
7bd9bcf3 | 1479 | /* |
a8f0db2d MH |
1480 | * Remove empty parent directories associated with the specified |
1481 | * reference and/or its reflog, but spare [logs/]refs/ and immediate | |
1482 | * subdirs. flags is a combination of REMOVE_EMPTY_PARENTS_REF and/or | |
1483 | * REMOVE_EMPTY_PARENTS_REFLOG. | |
7bd9bcf3 | 1484 | */ |
802de3da NTND |
1485 | static void try_remove_empty_parents(struct files_ref_store *refs, |
1486 | const char *refname, | |
1487 | unsigned int flags) | |
7bd9bcf3 | 1488 | { |
8bdaecb4 | 1489 | struct strbuf buf = STRBUF_INIT; |
e9dcc305 | 1490 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 MH |
1491 | char *p, *q; |
1492 | int i; | |
8bdaecb4 MH |
1493 | |
1494 | strbuf_addstr(&buf, refname); | |
1495 | p = buf.buf; | |
7bd9bcf3 MH |
1496 | for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */ |
1497 | while (*p && *p != '/') | |
1498 | p++; | |
1499 | /* tolerate duplicate slashes; see check_refname_format() */ | |
1500 | while (*p == '/') | |
1501 | p++; | |
1502 | } | |
8bdaecb4 | 1503 | q = buf.buf + buf.len; |
a8f0db2d | 1504 | while (flags & (REMOVE_EMPTY_PARENTS_REF | REMOVE_EMPTY_PARENTS_REFLOG)) { |
7bd9bcf3 MH |
1505 | while (q > p && *q != '/') |
1506 | q--; | |
1507 | while (q > p && *(q-1) == '/') | |
1508 | q--; | |
1509 | if (q == p) | |
1510 | break; | |
8bdaecb4 | 1511 | strbuf_setlen(&buf, q - buf.buf); |
e9dcc305 NTND |
1512 | |
1513 | strbuf_reset(&sb); | |
19e02f4f | 1514 | files_ref_path(refs, &sb, buf.buf); |
e9dcc305 | 1515 | if ((flags & REMOVE_EMPTY_PARENTS_REF) && rmdir(sb.buf)) |
a8f0db2d | 1516 | flags &= ~REMOVE_EMPTY_PARENTS_REF; |
e9dcc305 NTND |
1517 | |
1518 | strbuf_reset(&sb); | |
802de3da | 1519 | files_reflog_path(refs, &sb, buf.buf); |
e9dcc305 | 1520 | if ((flags & REMOVE_EMPTY_PARENTS_REFLOG) && rmdir(sb.buf)) |
a8f0db2d | 1521 | flags &= ~REMOVE_EMPTY_PARENTS_REFLOG; |
7bd9bcf3 | 1522 | } |
8bdaecb4 | 1523 | strbuf_release(&buf); |
e9dcc305 | 1524 | strbuf_release(&sb); |
7bd9bcf3 MH |
1525 | } |
1526 | ||
1527 | /* make sure nobody touched the ref, and unlink */ | |
2f40e954 | 1528 | static void prune_ref(struct files_ref_store *refs, struct ref_to_prune *r) |
7bd9bcf3 MH |
1529 | { |
1530 | struct ref_transaction *transaction; | |
1531 | struct strbuf err = STRBUF_INIT; | |
1532 | ||
1533 | if (check_refname_format(r->name, 0)) | |
1534 | return; | |
1535 | ||
2f40e954 | 1536 | transaction = ref_store_transaction_begin(&refs->base, &err); |
7bd9bcf3 MH |
1537 | if (!transaction || |
1538 | ref_transaction_delete(transaction, r->name, r->sha1, | |
c52ce248 | 1539 | REF_ISPRUNING | REF_NODEREF, NULL, &err) || |
7bd9bcf3 MH |
1540 | ref_transaction_commit(transaction, &err)) { |
1541 | ref_transaction_free(transaction); | |
1542 | error("%s", err.buf); | |
1543 | strbuf_release(&err); | |
1544 | return; | |
1545 | } | |
1546 | ref_transaction_free(transaction); | |
1547 | strbuf_release(&err); | |
7bd9bcf3 MH |
1548 | } |
1549 | ||
2f40e954 | 1550 | static void prune_refs(struct files_ref_store *refs, struct ref_to_prune *r) |
7bd9bcf3 MH |
1551 | { |
1552 | while (r) { | |
2f40e954 | 1553 | prune_ref(refs, r); |
7bd9bcf3 MH |
1554 | r = r->next; |
1555 | } | |
1556 | } | |
1557 | ||
8231527e | 1558 | static int files_pack_refs(struct ref_store *ref_store, unsigned int flags) |
7bd9bcf3 | 1559 | { |
00eebe35 | 1560 | struct files_ref_store *refs = |
9e7ec634 NTND |
1561 | files_downcast(ref_store, REF_STORE_WRITE | REF_STORE_ODB, |
1562 | "pack_refs"); | |
7bd9bcf3 MH |
1563 | struct pack_refs_cb_data cbdata; |
1564 | ||
1565 | memset(&cbdata, 0, sizeof(cbdata)); | |
1566 | cbdata.flags = flags; | |
1567 | ||
49c0df6a | 1568 | lock_packed_refs(refs, LOCK_DIE_ON_ERROR); |
00eebe35 | 1569 | cbdata.packed_refs = get_packed_refs(refs); |
7bd9bcf3 | 1570 | |
86f42358 | 1571 | do_for_each_entry_in_dir(get_loose_ref_dir(refs), |
7bd9bcf3 MH |
1572 | pack_if_possible_fn, &cbdata); |
1573 | ||
49c0df6a | 1574 | if (commit_packed_refs(refs)) |
7bd9bcf3 MH |
1575 | die_errno("unable to overwrite old ref-pack file"); |
1576 | ||
2f40e954 | 1577 | prune_refs(refs, cbdata.ref_to_prune); |
7bd9bcf3 MH |
1578 | return 0; |
1579 | } | |
1580 | ||
1581 | /* | |
1582 | * Rewrite the packed-refs file, omitting any refs listed in | |
1583 | * 'refnames'. On error, leave packed-refs unchanged, write an error | |
1584 | * message to 'err', and return a nonzero value. | |
1585 | * | |
1586 | * The refs in 'refnames' needn't be sorted. `err` must not be NULL. | |
1587 | */ | |
0a95ac5f MH |
1588 | static int repack_without_refs(struct files_ref_store *refs, |
1589 | struct string_list *refnames, struct strbuf *err) | |
7bd9bcf3 MH |
1590 | { |
1591 | struct ref_dir *packed; | |
1592 | struct string_list_item *refname; | |
1593 | int ret, needs_repacking = 0, removed = 0; | |
1594 | ||
32c597e7 | 1595 | files_assert_main_repository(refs, "repack_without_refs"); |
7bd9bcf3 MH |
1596 | assert(err); |
1597 | ||
1598 | /* Look for a packed ref */ | |
1599 | for_each_string_list_item(refname, refnames) { | |
f0d21efc | 1600 | if (get_packed_ref(refs, refname->string)) { |
7bd9bcf3 MH |
1601 | needs_repacking = 1; |
1602 | break; | |
1603 | } | |
1604 | } | |
1605 | ||
1606 | /* Avoid locking if we have nothing to do */ | |
1607 | if (!needs_repacking) | |
1608 | return 0; /* no refname exists in packed refs */ | |
1609 | ||
49c0df6a | 1610 | if (lock_packed_refs(refs, 0)) { |
33dfb9f3 | 1611 | unable_to_lock_message(files_packed_refs_path(refs), errno, err); |
7bd9bcf3 MH |
1612 | return -1; |
1613 | } | |
00eebe35 | 1614 | packed = get_packed_refs(refs); |
7bd9bcf3 MH |
1615 | |
1616 | /* Remove refnames from the cache */ | |
1617 | for_each_string_list_item(refname, refnames) | |
9fc3b063 | 1618 | if (remove_entry_from_dir(packed, refname->string) != -1) |
7bd9bcf3 MH |
1619 | removed = 1; |
1620 | if (!removed) { | |
1621 | /* | |
1622 | * All packed entries disappeared while we were | |
1623 | * acquiring the lock. | |
1624 | */ | |
49c0df6a | 1625 | rollback_packed_refs(refs); |
7bd9bcf3 MH |
1626 | return 0; |
1627 | } | |
1628 | ||
1629 | /* Write what remains */ | |
49c0df6a | 1630 | ret = commit_packed_refs(refs); |
7bd9bcf3 MH |
1631 | if (ret) |
1632 | strbuf_addf(err, "unable to overwrite old ref-pack file: %s", | |
1633 | strerror(errno)); | |
1634 | return ret; | |
1635 | } | |
1636 | ||
a27dcf89 DT |
1637 | static int files_delete_refs(struct ref_store *ref_store, |
1638 | struct string_list *refnames, unsigned int flags) | |
7bd9bcf3 | 1639 | { |
0a95ac5f | 1640 | struct files_ref_store *refs = |
9e7ec634 | 1641 | files_downcast(ref_store, REF_STORE_WRITE, "delete_refs"); |
7bd9bcf3 MH |
1642 | struct strbuf err = STRBUF_INIT; |
1643 | int i, result = 0; | |
1644 | ||
1645 | if (!refnames->nr) | |
1646 | return 0; | |
1647 | ||
0a95ac5f | 1648 | result = repack_without_refs(refs, refnames, &err); |
7bd9bcf3 MH |
1649 | if (result) { |
1650 | /* | |
1651 | * If we failed to rewrite the packed-refs file, then | |
1652 | * it is unsafe to try to remove loose refs, because | |
1653 | * doing so might expose an obsolete packed value for | |
1654 | * a reference that might even point at an object that | |
1655 | * has been garbage collected. | |
1656 | */ | |
1657 | if (refnames->nr == 1) | |
1658 | error(_("could not delete reference %s: %s"), | |
1659 | refnames->items[0].string, err.buf); | |
1660 | else | |
1661 | error(_("could not delete references: %s"), err.buf); | |
1662 | ||
1663 | goto out; | |
1664 | } | |
1665 | ||
1666 | for (i = 0; i < refnames->nr; i++) { | |
1667 | const char *refname = refnames->items[i].string; | |
1668 | ||
2f40e954 | 1669 | if (refs_delete_ref(&refs->base, NULL, refname, NULL, flags)) |
7bd9bcf3 MH |
1670 | result |= error(_("could not remove reference %s"), refname); |
1671 | } | |
1672 | ||
1673 | out: | |
1674 | strbuf_release(&err); | |
1675 | return result; | |
1676 | } | |
1677 | ||
1678 | /* | |
1679 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
1680 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
1681 | * | |
1682 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
1683 | * live into logs/refs. | |
1684 | */ | |
a5c1efd6 | 1685 | #define TMP_RENAMED_LOG "refs/.tmp-renamed-log" |
7bd9bcf3 | 1686 | |
e9dcc305 NTND |
1687 | struct rename_cb { |
1688 | const char *tmp_renamed_log; | |
1689 | int true_errno; | |
1690 | }; | |
1691 | ||
1692 | static int rename_tmp_log_callback(const char *path, void *cb_data) | |
7bd9bcf3 | 1693 | { |
e9dcc305 | 1694 | struct rename_cb *cb = cb_data; |
7bd9bcf3 | 1695 | |
e9dcc305 | 1696 | if (rename(cb->tmp_renamed_log, path)) { |
6a7f3631 MH |
1697 | /* |
1698 | * rename(a, b) when b is an existing directory ought | |
1699 | * to result in ISDIR, but Solaris 5.8 gives ENOTDIR. | |
1700 | * Sheesh. Record the true errno for error reporting, | |
1701 | * but report EISDIR to raceproof_create_file() so | |
1702 | * that it knows to retry. | |
1703 | */ | |
e9dcc305 | 1704 | cb->true_errno = errno; |
6a7f3631 MH |
1705 | if (errno == ENOTDIR) |
1706 | errno = EISDIR; | |
1707 | return -1; | |
1708 | } else { | |
1709 | return 0; | |
7bd9bcf3 | 1710 | } |
6a7f3631 | 1711 | } |
7bd9bcf3 | 1712 | |
802de3da | 1713 | static int rename_tmp_log(struct files_ref_store *refs, const char *newrefname) |
6a7f3631 | 1714 | { |
e9dcc305 NTND |
1715 | struct strbuf path = STRBUF_INIT; |
1716 | struct strbuf tmp = STRBUF_INIT; | |
1717 | struct rename_cb cb; | |
1718 | int ret; | |
6a7f3631 | 1719 | |
802de3da NTND |
1720 | files_reflog_path(refs, &path, newrefname); |
1721 | files_reflog_path(refs, &tmp, TMP_RENAMED_LOG); | |
e9dcc305 NTND |
1722 | cb.tmp_renamed_log = tmp.buf; |
1723 | ret = raceproof_create_file(path.buf, rename_tmp_log_callback, &cb); | |
6a7f3631 MH |
1724 | if (ret) { |
1725 | if (errno == EISDIR) | |
e9dcc305 | 1726 | error("directory not empty: %s", path.buf); |
6a7f3631 | 1727 | else |
990c98d2 | 1728 | error("unable to move logfile %s to %s: %s", |
e9dcc305 NTND |
1729 | tmp.buf, path.buf, |
1730 | strerror(cb.true_errno)); | |
7bd9bcf3 | 1731 | } |
6a7f3631 | 1732 | |
e9dcc305 NTND |
1733 | strbuf_release(&path); |
1734 | strbuf_release(&tmp); | |
7bd9bcf3 MH |
1735 | return ret; |
1736 | } | |
1737 | ||
7bd9bcf3 MH |
1738 | static int write_ref_to_lockfile(struct ref_lock *lock, |
1739 | const unsigned char *sha1, struct strbuf *err); | |
f18a7892 MH |
1740 | static int commit_ref_update(struct files_ref_store *refs, |
1741 | struct ref_lock *lock, | |
7bd9bcf3 | 1742 | const unsigned char *sha1, const char *logmsg, |
5d9b2de4 | 1743 | struct strbuf *err); |
7bd9bcf3 | 1744 | |
9b6b40d9 DT |
1745 | static int files_rename_ref(struct ref_store *ref_store, |
1746 | const char *oldrefname, const char *newrefname, | |
1747 | const char *logmsg) | |
7bd9bcf3 | 1748 | { |
9b6b40d9 | 1749 | struct files_ref_store *refs = |
9e7ec634 | 1750 | files_downcast(ref_store, REF_STORE_WRITE, "rename_ref"); |
7bd9bcf3 MH |
1751 | unsigned char sha1[20], orig_sha1[20]; |
1752 | int flag = 0, logmoved = 0; | |
1753 | struct ref_lock *lock; | |
1754 | struct stat loginfo; | |
e9dcc305 NTND |
1755 | struct strbuf sb_oldref = STRBUF_INIT; |
1756 | struct strbuf sb_newref = STRBUF_INIT; | |
1757 | struct strbuf tmp_renamed_log = STRBUF_INIT; | |
1758 | int log, ret; | |
7bd9bcf3 MH |
1759 | struct strbuf err = STRBUF_INIT; |
1760 | ||
802de3da NTND |
1761 | files_reflog_path(refs, &sb_oldref, oldrefname); |
1762 | files_reflog_path(refs, &sb_newref, newrefname); | |
1763 | files_reflog_path(refs, &tmp_renamed_log, TMP_RENAMED_LOG); | |
e9dcc305 NTND |
1764 | |
1765 | log = !lstat(sb_oldref.buf, &loginfo); | |
0a3f07d6 NTND |
1766 | if (log && S_ISLNK(loginfo.st_mode)) { |
1767 | ret = error("reflog for %s is a symlink", oldrefname); | |
1768 | goto out; | |
1769 | } | |
7bd9bcf3 | 1770 | |
2f40e954 NTND |
1771 | if (!refs_resolve_ref_unsafe(&refs->base, oldrefname, |
1772 | RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE, | |
0a3f07d6 NTND |
1773 | orig_sha1, &flag)) { |
1774 | ret = error("refname %s not found", oldrefname); | |
1775 | goto out; | |
1776 | } | |
e711b1af | 1777 | |
0a3f07d6 NTND |
1778 | if (flag & REF_ISSYMREF) { |
1779 | ret = error("refname %s is a symbolic ref, renaming it is not supported", | |
1780 | oldrefname); | |
1781 | goto out; | |
1782 | } | |
7d2df051 | 1783 | if (!refs_rename_ref_available(&refs->base, oldrefname, newrefname)) { |
0a3f07d6 NTND |
1784 | ret = 1; |
1785 | goto out; | |
1786 | } | |
7bd9bcf3 | 1787 | |
e9dcc305 | 1788 | if (log && rename(sb_oldref.buf, tmp_renamed_log.buf)) { |
a5c1efd6 | 1789 | ret = error("unable to move logfile logs/%s to logs/"TMP_RENAMED_LOG": %s", |
0a3f07d6 NTND |
1790 | oldrefname, strerror(errno)); |
1791 | goto out; | |
1792 | } | |
7bd9bcf3 | 1793 | |
2f40e954 NTND |
1794 | if (refs_delete_ref(&refs->base, logmsg, oldrefname, |
1795 | orig_sha1, REF_NODEREF)) { | |
7bd9bcf3 MH |
1796 | error("unable to delete old %s", oldrefname); |
1797 | goto rollback; | |
1798 | } | |
1799 | ||
12fd3496 DT |
1800 | /* |
1801 | * Since we are doing a shallow lookup, sha1 is not the | |
1802 | * correct value to pass to delete_ref as old_sha1. But that | |
1803 | * doesn't matter, because an old_sha1 check wouldn't add to | |
1804 | * the safety anyway; we want to delete the reference whatever | |
1805 | * its current value. | |
1806 | */ | |
2f40e954 NTND |
1807 | if (!refs_read_ref_full(&refs->base, newrefname, |
1808 | RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE, | |
1809 | sha1, NULL) && | |
1810 | refs_delete_ref(&refs->base, NULL, newrefname, | |
1811 | NULL, REF_NODEREF)) { | |
58364324 | 1812 | if (errno == EISDIR) { |
7bd9bcf3 MH |
1813 | struct strbuf path = STRBUF_INIT; |
1814 | int result; | |
1815 | ||
19e02f4f | 1816 | files_ref_path(refs, &path, newrefname); |
7bd9bcf3 MH |
1817 | result = remove_empty_directories(&path); |
1818 | strbuf_release(&path); | |
1819 | ||
1820 | if (result) { | |
1821 | error("Directory not empty: %s", newrefname); | |
1822 | goto rollback; | |
1823 | } | |
1824 | } else { | |
1825 | error("unable to delete existing %s", newrefname); | |
1826 | goto rollback; | |
1827 | } | |
1828 | } | |
1829 | ||
802de3da | 1830 | if (log && rename_tmp_log(refs, newrefname)) |
7bd9bcf3 MH |
1831 | goto rollback; |
1832 | ||
1833 | logmoved = log; | |
1834 | ||
7eb27cdf MH |
1835 | lock = lock_ref_sha1_basic(refs, newrefname, NULL, NULL, NULL, |
1836 | REF_NODEREF, NULL, &err); | |
7bd9bcf3 MH |
1837 | if (!lock) { |
1838 | error("unable to rename '%s' to '%s': %s", oldrefname, newrefname, err.buf); | |
1839 | strbuf_release(&err); | |
1840 | goto rollback; | |
1841 | } | |
1842 | hashcpy(lock->old_oid.hash, orig_sha1); | |
1843 | ||
1844 | if (write_ref_to_lockfile(lock, orig_sha1, &err) || | |
f18a7892 | 1845 | commit_ref_update(refs, lock, orig_sha1, logmsg, &err)) { |
7bd9bcf3 MH |
1846 | error("unable to write current sha1 into %s: %s", newrefname, err.buf); |
1847 | strbuf_release(&err); | |
1848 | goto rollback; | |
1849 | } | |
1850 | ||
0a3f07d6 NTND |
1851 | ret = 0; |
1852 | goto out; | |
7bd9bcf3 MH |
1853 | |
1854 | rollback: | |
7eb27cdf MH |
1855 | lock = lock_ref_sha1_basic(refs, oldrefname, NULL, NULL, NULL, |
1856 | REF_NODEREF, NULL, &err); | |
7bd9bcf3 MH |
1857 | if (!lock) { |
1858 | error("unable to lock %s for rollback: %s", oldrefname, err.buf); | |
1859 | strbuf_release(&err); | |
1860 | goto rollbacklog; | |
1861 | } | |
1862 | ||
1863 | flag = log_all_ref_updates; | |
341fb286 | 1864 | log_all_ref_updates = LOG_REFS_NONE; |
7bd9bcf3 | 1865 | if (write_ref_to_lockfile(lock, orig_sha1, &err) || |
f18a7892 | 1866 | commit_ref_update(refs, lock, orig_sha1, NULL, &err)) { |
7bd9bcf3 MH |
1867 | error("unable to write current sha1 into %s: %s", oldrefname, err.buf); |
1868 | strbuf_release(&err); | |
1869 | } | |
1870 | log_all_ref_updates = flag; | |
1871 | ||
1872 | rollbacklog: | |
e9dcc305 | 1873 | if (logmoved && rename(sb_newref.buf, sb_oldref.buf)) |
7bd9bcf3 MH |
1874 | error("unable to restore logfile %s from %s: %s", |
1875 | oldrefname, newrefname, strerror(errno)); | |
1876 | if (!logmoved && log && | |
e9dcc305 | 1877 | rename(tmp_renamed_log.buf, sb_oldref.buf)) |
a5c1efd6 | 1878 | error("unable to restore logfile %s from logs/"TMP_RENAMED_LOG": %s", |
7bd9bcf3 | 1879 | oldrefname, strerror(errno)); |
0a3f07d6 NTND |
1880 | ret = 1; |
1881 | out: | |
e9dcc305 NTND |
1882 | strbuf_release(&sb_newref); |
1883 | strbuf_release(&sb_oldref); | |
1884 | strbuf_release(&tmp_renamed_log); | |
1885 | ||
0a3f07d6 | 1886 | return ret; |
7bd9bcf3 MH |
1887 | } |
1888 | ||
1889 | static int close_ref(struct ref_lock *lock) | |
1890 | { | |
1891 | if (close_lock_file(lock->lk)) | |
1892 | return -1; | |
1893 | return 0; | |
1894 | } | |
1895 | ||
1896 | static int commit_ref(struct ref_lock *lock) | |
1897 | { | |
5387c0d8 MH |
1898 | char *path = get_locked_file_path(lock->lk); |
1899 | struct stat st; | |
1900 | ||
1901 | if (!lstat(path, &st) && S_ISDIR(st.st_mode)) { | |
1902 | /* | |
1903 | * There is a directory at the path we want to rename | |
1904 | * the lockfile to. Hopefully it is empty; try to | |
1905 | * delete it. | |
1906 | */ | |
1907 | size_t len = strlen(path); | |
1908 | struct strbuf sb_path = STRBUF_INIT; | |
1909 | ||
1910 | strbuf_attach(&sb_path, path, len, len); | |
1911 | ||
1912 | /* | |
1913 | * If this fails, commit_lock_file() will also fail | |
1914 | * and will report the problem. | |
1915 | */ | |
1916 | remove_empty_directories(&sb_path); | |
1917 | strbuf_release(&sb_path); | |
1918 | } else { | |
1919 | free(path); | |
1920 | } | |
1921 | ||
7bd9bcf3 MH |
1922 | if (commit_lock_file(lock->lk)) |
1923 | return -1; | |
1924 | return 0; | |
1925 | } | |
1926 | ||
1fb0c809 MH |
1927 | static int open_or_create_logfile(const char *path, void *cb) |
1928 | { | |
1929 | int *fd = cb; | |
1930 | ||
1931 | *fd = open(path, O_APPEND | O_WRONLY | O_CREAT, 0666); | |
1932 | return (*fd < 0) ? -1 : 0; | |
1933 | } | |
1934 | ||
7bd9bcf3 | 1935 | /* |
4533e534 MH |
1936 | * Create a reflog for a ref. If force_create = 0, only create the |
1937 | * reflog for certain refs (those for which should_autocreate_reflog | |
1938 | * returns non-zero). Otherwise, create it regardless of the reference | |
1939 | * name. If the logfile already existed or was created, return 0 and | |
1940 | * set *logfd to the file descriptor opened for appending to the file. | |
1941 | * If no logfile exists and we decided not to create one, return 0 and | |
1942 | * set *logfd to -1. On failure, fill in *err, set *logfd to -1, and | |
1943 | * return -1. | |
7bd9bcf3 | 1944 | */ |
802de3da NTND |
1945 | static int log_ref_setup(struct files_ref_store *refs, |
1946 | const char *refname, int force_create, | |
4533e534 | 1947 | int *logfd, struct strbuf *err) |
7bd9bcf3 | 1948 | { |
802de3da NTND |
1949 | struct strbuf logfile_sb = STRBUF_INIT; |
1950 | char *logfile; | |
1951 | ||
1952 | files_reflog_path(refs, &logfile_sb, refname); | |
1953 | logfile = strbuf_detach(&logfile_sb, NULL); | |
7bd9bcf3 | 1954 | |
7bd9bcf3 | 1955 | if (force_create || should_autocreate_reflog(refname)) { |
4533e534 | 1956 | if (raceproof_create_file(logfile, open_or_create_logfile, logfd)) { |
1fb0c809 MH |
1957 | if (errno == ENOENT) |
1958 | strbuf_addf(err, "unable to create directory for '%s': " | |
4533e534 | 1959 | "%s", logfile, strerror(errno)); |
1fb0c809 MH |
1960 | else if (errno == EISDIR) |
1961 | strbuf_addf(err, "there are still logs under '%s'", | |
4533e534 | 1962 | logfile); |
1fb0c809 | 1963 | else |
854bda6b | 1964 | strbuf_addf(err, "unable to append to '%s': %s", |
4533e534 | 1965 | logfile, strerror(errno)); |
7bd9bcf3 | 1966 | |
4533e534 | 1967 | goto error; |
7bd9bcf3 | 1968 | } |
854bda6b | 1969 | } else { |
4533e534 | 1970 | *logfd = open(logfile, O_APPEND | O_WRONLY, 0666); |
e404f459 | 1971 | if (*logfd < 0) { |
854bda6b MH |
1972 | if (errno == ENOENT || errno == EISDIR) { |
1973 | /* | |
1974 | * The logfile doesn't already exist, | |
1975 | * but that is not an error; it only | |
1976 | * means that we won't write log | |
1977 | * entries to it. | |
1978 | */ | |
1979 | ; | |
1980 | } else { | |
1981 | strbuf_addf(err, "unable to append to '%s': %s", | |
4533e534 MH |
1982 | logfile, strerror(errno)); |
1983 | goto error; | |
854bda6b | 1984 | } |
7bd9bcf3 MH |
1985 | } |
1986 | } | |
1987 | ||
e404f459 | 1988 | if (*logfd >= 0) |
4533e534 | 1989 | adjust_shared_perm(logfile); |
854bda6b | 1990 | |
4533e534 | 1991 | free(logfile); |
7bd9bcf3 | 1992 | return 0; |
7bd9bcf3 | 1993 | |
4533e534 MH |
1994 | error: |
1995 | free(logfile); | |
1996 | return -1; | |
7bd9bcf3 | 1997 | } |
7bd9bcf3 | 1998 | |
e3688bd6 DT |
1999 | static int files_create_reflog(struct ref_store *ref_store, |
2000 | const char *refname, int force_create, | |
2001 | struct strbuf *err) | |
7bd9bcf3 | 2002 | { |
802de3da | 2003 | struct files_ref_store *refs = |
9e7ec634 | 2004 | files_downcast(ref_store, REF_STORE_WRITE, "create_reflog"); |
e404f459 | 2005 | int fd; |
7bd9bcf3 | 2006 | |
802de3da | 2007 | if (log_ref_setup(refs, refname, force_create, &fd, err)) |
4533e534 MH |
2008 | return -1; |
2009 | ||
e404f459 MH |
2010 | if (fd >= 0) |
2011 | close(fd); | |
4533e534 MH |
2012 | |
2013 | return 0; | |
7bd9bcf3 MH |
2014 | } |
2015 | ||
2016 | static int log_ref_write_fd(int fd, const unsigned char *old_sha1, | |
2017 | const unsigned char *new_sha1, | |
2018 | const char *committer, const char *msg) | |
2019 | { | |
2020 | int msglen, written; | |
2021 | unsigned maxlen, len; | |
2022 | char *logrec; | |
2023 | ||
2024 | msglen = msg ? strlen(msg) : 0; | |
2025 | maxlen = strlen(committer) + msglen + 100; | |
2026 | logrec = xmalloc(maxlen); | |
2027 | len = xsnprintf(logrec, maxlen, "%s %s %s\n", | |
2028 | sha1_to_hex(old_sha1), | |
2029 | sha1_to_hex(new_sha1), | |
2030 | committer); | |
2031 | if (msglen) | |
2032 | len += copy_reflog_msg(logrec + len - 1, msg) - 1; | |
2033 | ||
2034 | written = len <= maxlen ? write_in_full(fd, logrec, len) : -1; | |
2035 | free(logrec); | |
2036 | if (written != len) | |
2037 | return -1; | |
2038 | ||
2039 | return 0; | |
2040 | } | |
2041 | ||
802de3da NTND |
2042 | static int files_log_ref_write(struct files_ref_store *refs, |
2043 | const char *refname, const unsigned char *old_sha1, | |
11f8457f NTND |
2044 | const unsigned char *new_sha1, const char *msg, |
2045 | int flags, struct strbuf *err) | |
7bd9bcf3 | 2046 | { |
e404f459 | 2047 | int logfd, result; |
7bd9bcf3 | 2048 | |
341fb286 CW |
2049 | if (log_all_ref_updates == LOG_REFS_UNSET) |
2050 | log_all_ref_updates = is_bare_repository() ? LOG_REFS_NONE : LOG_REFS_NORMAL; | |
7bd9bcf3 | 2051 | |
802de3da NTND |
2052 | result = log_ref_setup(refs, refname, |
2053 | flags & REF_FORCE_CREATE_REFLOG, | |
4533e534 | 2054 | &logfd, err); |
7bd9bcf3 MH |
2055 | |
2056 | if (result) | |
2057 | return result; | |
2058 | ||
7bd9bcf3 MH |
2059 | if (logfd < 0) |
2060 | return 0; | |
2061 | result = log_ref_write_fd(logfd, old_sha1, new_sha1, | |
2062 | git_committer_info(0), msg); | |
2063 | if (result) { | |
e9dcc305 | 2064 | struct strbuf sb = STRBUF_INIT; |
87b21e05 MH |
2065 | int save_errno = errno; |
2066 | ||
802de3da | 2067 | files_reflog_path(refs, &sb, refname); |
87b21e05 | 2068 | strbuf_addf(err, "unable to append to '%s': %s", |
e9dcc305 NTND |
2069 | sb.buf, strerror(save_errno)); |
2070 | strbuf_release(&sb); | |
7bd9bcf3 MH |
2071 | close(logfd); |
2072 | return -1; | |
2073 | } | |
2074 | if (close(logfd)) { | |
e9dcc305 | 2075 | struct strbuf sb = STRBUF_INIT; |
87b21e05 MH |
2076 | int save_errno = errno; |
2077 | ||
802de3da | 2078 | files_reflog_path(refs, &sb, refname); |
87b21e05 | 2079 | strbuf_addf(err, "unable to append to '%s': %s", |
e9dcc305 NTND |
2080 | sb.buf, strerror(save_errno)); |
2081 | strbuf_release(&sb); | |
7bd9bcf3 MH |
2082 | return -1; |
2083 | } | |
2084 | return 0; | |
2085 | } | |
2086 | ||
7bd9bcf3 MH |
2087 | /* |
2088 | * Write sha1 into the open lockfile, then close the lockfile. On | |
2089 | * errors, rollback the lockfile, fill in *err and | |
2090 | * return -1. | |
2091 | */ | |
2092 | static int write_ref_to_lockfile(struct ref_lock *lock, | |
2093 | const unsigned char *sha1, struct strbuf *err) | |
2094 | { | |
2095 | static char term = '\n'; | |
2096 | struct object *o; | |
2097 | int fd; | |
2098 | ||
2099 | o = parse_object(sha1); | |
2100 | if (!o) { | |
2101 | strbuf_addf(err, | |
0568c8e9 | 2102 | "trying to write ref '%s' with nonexistent object %s", |
7bd9bcf3 MH |
2103 | lock->ref_name, sha1_to_hex(sha1)); |
2104 | unlock_ref(lock); | |
2105 | return -1; | |
2106 | } | |
2107 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
2108 | strbuf_addf(err, | |
0568c8e9 | 2109 | "trying to write non-commit object %s to branch '%s'", |
7bd9bcf3 MH |
2110 | sha1_to_hex(sha1), lock->ref_name); |
2111 | unlock_ref(lock); | |
2112 | return -1; | |
2113 | } | |
2114 | fd = get_lock_file_fd(lock->lk); | |
2115 | if (write_in_full(fd, sha1_to_hex(sha1), 40) != 40 || | |
2116 | write_in_full(fd, &term, 1) != 1 || | |
2117 | close_ref(lock) < 0) { | |
2118 | strbuf_addf(err, | |
0568c8e9 | 2119 | "couldn't write '%s'", get_lock_file_path(lock->lk)); |
7bd9bcf3 MH |
2120 | unlock_ref(lock); |
2121 | return -1; | |
2122 | } | |
2123 | return 0; | |
2124 | } | |
2125 | ||
2126 | /* | |
2127 | * Commit a change to a loose reference that has already been written | |
2128 | * to the loose reference lockfile. Also update the reflogs if | |
2129 | * necessary, using the specified lockmsg (which can be NULL). | |
2130 | */ | |
f18a7892 MH |
2131 | static int commit_ref_update(struct files_ref_store *refs, |
2132 | struct ref_lock *lock, | |
7bd9bcf3 | 2133 | const unsigned char *sha1, const char *logmsg, |
5d9b2de4 | 2134 | struct strbuf *err) |
7bd9bcf3 | 2135 | { |
32c597e7 | 2136 | files_assert_main_repository(refs, "commit_ref_update"); |
00eebe35 MH |
2137 | |
2138 | clear_loose_ref_cache(refs); | |
802de3da NTND |
2139 | if (files_log_ref_write(refs, lock->ref_name, |
2140 | lock->old_oid.hash, sha1, | |
81b1b6d4 | 2141 | logmsg, 0, err)) { |
7bd9bcf3 | 2142 | char *old_msg = strbuf_detach(err, NULL); |
0568c8e9 | 2143 | strbuf_addf(err, "cannot update the ref '%s': %s", |
7bd9bcf3 MH |
2144 | lock->ref_name, old_msg); |
2145 | free(old_msg); | |
2146 | unlock_ref(lock); | |
2147 | return -1; | |
2148 | } | |
7a418f3a MH |
2149 | |
2150 | if (strcmp(lock->ref_name, "HEAD") != 0) { | |
7bd9bcf3 MH |
2151 | /* |
2152 | * Special hack: If a branch is updated directly and HEAD | |
2153 | * points to it (may happen on the remote side of a push | |
2154 | * for example) then logically the HEAD reflog should be | |
2155 | * updated too. | |
2156 | * A generic solution implies reverse symref information, | |
2157 | * but finding all symrefs pointing to the given branch | |
2158 | * would be rather costly for this rare event (the direct | |
2159 | * update of a branch) to be worth it. So let's cheat and | |
2160 | * check with HEAD only which should cover 99% of all usage | |
2161 | * scenarios (even 100% of the default ones). | |
2162 | */ | |
2163 | unsigned char head_sha1[20]; | |
2164 | int head_flag; | |
2165 | const char *head_ref; | |
7a418f3a | 2166 | |
2f40e954 NTND |
2167 | head_ref = refs_resolve_ref_unsafe(&refs->base, "HEAD", |
2168 | RESOLVE_REF_READING, | |
2169 | head_sha1, &head_flag); | |
7bd9bcf3 MH |
2170 | if (head_ref && (head_flag & REF_ISSYMREF) && |
2171 | !strcmp(head_ref, lock->ref_name)) { | |
2172 | struct strbuf log_err = STRBUF_INIT; | |
802de3da NTND |
2173 | if (files_log_ref_write(refs, "HEAD", |
2174 | lock->old_oid.hash, sha1, | |
2175 | logmsg, 0, &log_err)) { | |
7bd9bcf3 MH |
2176 | error("%s", log_err.buf); |
2177 | strbuf_release(&log_err); | |
2178 | } | |
2179 | } | |
2180 | } | |
7a418f3a | 2181 | |
7bd9bcf3 | 2182 | if (commit_ref(lock)) { |
0568c8e9 | 2183 | strbuf_addf(err, "couldn't set '%s'", lock->ref_name); |
7bd9bcf3 MH |
2184 | unlock_ref(lock); |
2185 | return -1; | |
2186 | } | |
2187 | ||
2188 | unlock_ref(lock); | |
2189 | return 0; | |
2190 | } | |
2191 | ||
370e5ad6 | 2192 | static int create_ref_symlink(struct ref_lock *lock, const char *target) |
7bd9bcf3 | 2193 | { |
370e5ad6 | 2194 | int ret = -1; |
7bd9bcf3 | 2195 | #ifndef NO_SYMLINK_HEAD |
370e5ad6 JK |
2196 | char *ref_path = get_locked_file_path(lock->lk); |
2197 | unlink(ref_path); | |
2198 | ret = symlink(target, ref_path); | |
2199 | free(ref_path); | |
2200 | ||
2201 | if (ret) | |
7bd9bcf3 | 2202 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
7bd9bcf3 | 2203 | #endif |
370e5ad6 JK |
2204 | return ret; |
2205 | } | |
7bd9bcf3 | 2206 | |
802de3da NTND |
2207 | static void update_symref_reflog(struct files_ref_store *refs, |
2208 | struct ref_lock *lock, const char *refname, | |
370e5ad6 JK |
2209 | const char *target, const char *logmsg) |
2210 | { | |
2211 | struct strbuf err = STRBUF_INIT; | |
2212 | unsigned char new_sha1[20]; | |
2f40e954 NTND |
2213 | if (logmsg && |
2214 | !refs_read_ref_full(&refs->base, target, | |
2215 | RESOLVE_REF_READING, new_sha1, NULL) && | |
802de3da NTND |
2216 | files_log_ref_write(refs, refname, lock->old_oid.hash, |
2217 | new_sha1, logmsg, 0, &err)) { | |
7bd9bcf3 MH |
2218 | error("%s", err.buf); |
2219 | strbuf_release(&err); | |
2220 | } | |
370e5ad6 | 2221 | } |
7bd9bcf3 | 2222 | |
802de3da NTND |
2223 | static int create_symref_locked(struct files_ref_store *refs, |
2224 | struct ref_lock *lock, const char *refname, | |
370e5ad6 JK |
2225 | const char *target, const char *logmsg) |
2226 | { | |
2227 | if (prefer_symlink_refs && !create_ref_symlink(lock, target)) { | |
802de3da | 2228 | update_symref_reflog(refs, lock, refname, target, logmsg); |
370e5ad6 JK |
2229 | return 0; |
2230 | } | |
2231 | ||
2232 | if (!fdopen_lock_file(lock->lk, "w")) | |
2233 | return error("unable to fdopen %s: %s", | |
2234 | lock->lk->tempfile.filename.buf, strerror(errno)); | |
2235 | ||
802de3da | 2236 | update_symref_reflog(refs, lock, refname, target, logmsg); |
396da8f7 | 2237 | |
370e5ad6 JK |
2238 | /* no error check; commit_ref will check ferror */ |
2239 | fprintf(lock->lk->tempfile.fp, "ref: %s\n", target); | |
2240 | if (commit_ref(lock) < 0) | |
2241 | return error("unable to write symref for %s: %s", refname, | |
2242 | strerror(errno)); | |
7bd9bcf3 MH |
2243 | return 0; |
2244 | } | |
2245 | ||
284689ba MH |
2246 | static int files_create_symref(struct ref_store *ref_store, |
2247 | const char *refname, const char *target, | |
2248 | const char *logmsg) | |
370e5ad6 | 2249 | { |
7eb27cdf | 2250 | struct files_ref_store *refs = |
9e7ec634 | 2251 | files_downcast(ref_store, REF_STORE_WRITE, "create_symref"); |
370e5ad6 JK |
2252 | struct strbuf err = STRBUF_INIT; |
2253 | struct ref_lock *lock; | |
2254 | int ret; | |
2255 | ||
7eb27cdf MH |
2256 | lock = lock_ref_sha1_basic(refs, refname, NULL, |
2257 | NULL, NULL, REF_NODEREF, NULL, | |
370e5ad6 JK |
2258 | &err); |
2259 | if (!lock) { | |
2260 | error("%s", err.buf); | |
2261 | strbuf_release(&err); | |
2262 | return -1; | |
2263 | } | |
2264 | ||
802de3da | 2265 | ret = create_symref_locked(refs, lock, refname, target, logmsg); |
370e5ad6 JK |
2266 | unlock_ref(lock); |
2267 | return ret; | |
2268 | } | |
2269 | ||
39ee4c6c | 2270 | int set_worktree_head_symref(const char *gitdir, const char *target, const char *logmsg) |
2233066e | 2271 | { |
802de3da NTND |
2272 | /* |
2273 | * FIXME: this obviously will not work well for future refs | |
2274 | * backends. This function needs to die. | |
2275 | */ | |
2276 | struct files_ref_store *refs = | |
9e7ec634 NTND |
2277 | files_downcast(get_main_ref_store(), |
2278 | REF_STORE_WRITE, | |
2279 | "set_head_symref"); | |
802de3da | 2280 | |
2233066e KY |
2281 | static struct lock_file head_lock; |
2282 | struct ref_lock *lock; | |
2233066e KY |
2283 | struct strbuf head_path = STRBUF_INIT; |
2284 | const char *head_rel; | |
2285 | int ret; | |
2286 | ||
2287 | strbuf_addf(&head_path, "%s/HEAD", absolute_path(gitdir)); | |
2288 | if (hold_lock_file_for_update(&head_lock, head_path.buf, | |
2289 | LOCK_NO_DEREF) < 0) { | |
18eb3a9c KY |
2290 | struct strbuf err = STRBUF_INIT; |
2291 | unable_to_lock_message(head_path.buf, errno, &err); | |
2233066e KY |
2292 | error("%s", err.buf); |
2293 | strbuf_release(&err); | |
2294 | strbuf_release(&head_path); | |
2295 | return -1; | |
2296 | } | |
2297 | ||
2298 | /* head_rel will be "HEAD" for the main tree, "worktrees/wt/HEAD" for | |
2299 | linked trees */ | |
2300 | head_rel = remove_leading_path(head_path.buf, | |
2301 | absolute_path(get_git_common_dir())); | |
2302 | /* to make use of create_symref_locked(), initialize ref_lock */ | |
2303 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
2304 | lock->lk = &head_lock; | |
2305 | lock->ref_name = xstrdup(head_rel); | |
2233066e | 2306 | |
802de3da | 2307 | ret = create_symref_locked(refs, lock, head_rel, target, logmsg); |
2233066e KY |
2308 | |
2309 | unlock_ref(lock); /* will free lock */ | |
2310 | strbuf_release(&head_path); | |
2311 | return ret; | |
2312 | } | |
2313 | ||
e3688bd6 DT |
2314 | static int files_reflog_exists(struct ref_store *ref_store, |
2315 | const char *refname) | |
7bd9bcf3 | 2316 | { |
802de3da | 2317 | struct files_ref_store *refs = |
9e7ec634 | 2318 | files_downcast(ref_store, REF_STORE_READ, "reflog_exists"); |
e9dcc305 | 2319 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 | 2320 | struct stat st; |
e9dcc305 | 2321 | int ret; |
7bd9bcf3 | 2322 | |
802de3da | 2323 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
2324 | ret = !lstat(sb.buf, &st) && S_ISREG(st.st_mode); |
2325 | strbuf_release(&sb); | |
2326 | return ret; | |
7bd9bcf3 MH |
2327 | } |
2328 | ||
e3688bd6 DT |
2329 | static int files_delete_reflog(struct ref_store *ref_store, |
2330 | const char *refname) | |
7bd9bcf3 | 2331 | { |
802de3da | 2332 | struct files_ref_store *refs = |
9e7ec634 | 2333 | files_downcast(ref_store, REF_STORE_WRITE, "delete_reflog"); |
e9dcc305 NTND |
2334 | struct strbuf sb = STRBUF_INIT; |
2335 | int ret; | |
2336 | ||
802de3da | 2337 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
2338 | ret = remove_path(sb.buf); |
2339 | strbuf_release(&sb); | |
2340 | return ret; | |
7bd9bcf3 MH |
2341 | } |
2342 | ||
2343 | static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data) | |
2344 | { | |
9461d272 | 2345 | struct object_id ooid, noid; |
7bd9bcf3 MH |
2346 | char *email_end, *message; |
2347 | unsigned long timestamp; | |
2348 | int tz; | |
43bc3b6c | 2349 | const char *p = sb->buf; |
7bd9bcf3 MH |
2350 | |
2351 | /* old SP new SP name <email> SP time TAB msg LF */ | |
43bc3b6c | 2352 | if (!sb->len || sb->buf[sb->len - 1] != '\n' || |
2353 | parse_oid_hex(p, &ooid, &p) || *p++ != ' ' || | |
2354 | parse_oid_hex(p, &noid, &p) || *p++ != ' ' || | |
2355 | !(email_end = strchr(p, '>')) || | |
7bd9bcf3 MH |
2356 | email_end[1] != ' ' || |
2357 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
2358 | !message || message[0] != ' ' || | |
2359 | (message[1] != '+' && message[1] != '-') || | |
2360 | !isdigit(message[2]) || !isdigit(message[3]) || | |
2361 | !isdigit(message[4]) || !isdigit(message[5])) | |
2362 | return 0; /* corrupt? */ | |
2363 | email_end[1] = '\0'; | |
2364 | tz = strtol(message + 1, NULL, 10); | |
2365 | if (message[6] != '\t') | |
2366 | message += 6; | |
2367 | else | |
2368 | message += 7; | |
43bc3b6c | 2369 | return fn(&ooid, &noid, p, timestamp, tz, message, cb_data); |
7bd9bcf3 MH |
2370 | } |
2371 | ||
2372 | static char *find_beginning_of_line(char *bob, char *scan) | |
2373 | { | |
2374 | while (bob < scan && *(--scan) != '\n') | |
2375 | ; /* keep scanning backwards */ | |
2376 | /* | |
2377 | * Return either beginning of the buffer, or LF at the end of | |
2378 | * the previous line. | |
2379 | */ | |
2380 | return scan; | |
2381 | } | |
2382 | ||
e3688bd6 DT |
2383 | static int files_for_each_reflog_ent_reverse(struct ref_store *ref_store, |
2384 | const char *refname, | |
2385 | each_reflog_ent_fn fn, | |
2386 | void *cb_data) | |
7bd9bcf3 | 2387 | { |
802de3da | 2388 | struct files_ref_store *refs = |
9e7ec634 NTND |
2389 | files_downcast(ref_store, REF_STORE_READ, |
2390 | "for_each_reflog_ent_reverse"); | |
7bd9bcf3 MH |
2391 | struct strbuf sb = STRBUF_INIT; |
2392 | FILE *logfp; | |
2393 | long pos; | |
2394 | int ret = 0, at_tail = 1; | |
2395 | ||
802de3da | 2396 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
2397 | logfp = fopen(sb.buf, "r"); |
2398 | strbuf_release(&sb); | |
7bd9bcf3 MH |
2399 | if (!logfp) |
2400 | return -1; | |
2401 | ||
2402 | /* Jump to the end */ | |
2403 | if (fseek(logfp, 0, SEEK_END) < 0) | |
2404 | return error("cannot seek back reflog for %s: %s", | |
2405 | refname, strerror(errno)); | |
2406 | pos = ftell(logfp); | |
2407 | while (!ret && 0 < pos) { | |
2408 | int cnt; | |
2409 | size_t nread; | |
2410 | char buf[BUFSIZ]; | |
2411 | char *endp, *scanp; | |
2412 | ||
2413 | /* Fill next block from the end */ | |
2414 | cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos; | |
2415 | if (fseek(logfp, pos - cnt, SEEK_SET)) | |
2416 | return error("cannot seek back reflog for %s: %s", | |
2417 | refname, strerror(errno)); | |
2418 | nread = fread(buf, cnt, 1, logfp); | |
2419 | if (nread != 1) | |
2420 | return error("cannot read %d bytes from reflog for %s: %s", | |
2421 | cnt, refname, strerror(errno)); | |
2422 | pos -= cnt; | |
2423 | ||
2424 | scanp = endp = buf + cnt; | |
2425 | if (at_tail && scanp[-1] == '\n') | |
2426 | /* Looking at the final LF at the end of the file */ | |
2427 | scanp--; | |
2428 | at_tail = 0; | |
2429 | ||
2430 | while (buf < scanp) { | |
2431 | /* | |
2432 | * terminating LF of the previous line, or the beginning | |
2433 | * of the buffer. | |
2434 | */ | |
2435 | char *bp; | |
2436 | ||
2437 | bp = find_beginning_of_line(buf, scanp); | |
2438 | ||
2439 | if (*bp == '\n') { | |
2440 | /* | |
2441 | * The newline is the end of the previous line, | |
2442 | * so we know we have complete line starting | |
2443 | * at (bp + 1). Prefix it onto any prior data | |
2444 | * we collected for the line and process it. | |
2445 | */ | |
2446 | strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1)); | |
2447 | scanp = bp; | |
2448 | endp = bp + 1; | |
2449 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
2450 | strbuf_reset(&sb); | |
2451 | if (ret) | |
2452 | break; | |
2453 | } else if (!pos) { | |
2454 | /* | |
2455 | * We are at the start of the buffer, and the | |
2456 | * start of the file; there is no previous | |
2457 | * line, and we have everything for this one. | |
2458 | * Process it, and we can end the loop. | |
2459 | */ | |
2460 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
2461 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
2462 | strbuf_reset(&sb); | |
2463 | break; | |
2464 | } | |
2465 | ||
2466 | if (bp == buf) { | |
2467 | /* | |
2468 | * We are at the start of the buffer, and there | |
2469 | * is more file to read backwards. Which means | |
2470 | * we are in the middle of a line. Note that we | |
2471 | * may get here even if *bp was a newline; that | |
2472 | * just means we are at the exact end of the | |
2473 | * previous line, rather than some spot in the | |
2474 | * middle. | |
2475 | * | |
2476 | * Save away what we have to be combined with | |
2477 | * the data from the next read. | |
2478 | */ | |
2479 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
2480 | break; | |
2481 | } | |
2482 | } | |
2483 | ||
2484 | } | |
2485 | if (!ret && sb.len) | |
2486 | die("BUG: reverse reflog parser had leftover data"); | |
2487 | ||
2488 | fclose(logfp); | |
2489 | strbuf_release(&sb); | |
2490 | return ret; | |
2491 | } | |
2492 | ||
e3688bd6 DT |
2493 | static int files_for_each_reflog_ent(struct ref_store *ref_store, |
2494 | const char *refname, | |
2495 | each_reflog_ent_fn fn, void *cb_data) | |
7bd9bcf3 | 2496 | { |
802de3da | 2497 | struct files_ref_store *refs = |
9e7ec634 NTND |
2498 | files_downcast(ref_store, REF_STORE_READ, |
2499 | "for_each_reflog_ent"); | |
7bd9bcf3 MH |
2500 | FILE *logfp; |
2501 | struct strbuf sb = STRBUF_INIT; | |
2502 | int ret = 0; | |
2503 | ||
802de3da | 2504 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
2505 | logfp = fopen(sb.buf, "r"); |
2506 | strbuf_release(&sb); | |
7bd9bcf3 MH |
2507 | if (!logfp) |
2508 | return -1; | |
2509 | ||
2510 | while (!ret && !strbuf_getwholeline(&sb, logfp, '\n')) | |
2511 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
2512 | fclose(logfp); | |
2513 | strbuf_release(&sb); | |
2514 | return ret; | |
2515 | } | |
7bd9bcf3 | 2516 | |
2880d16f MH |
2517 | struct files_reflog_iterator { |
2518 | struct ref_iterator base; | |
7bd9bcf3 | 2519 | |
2f40e954 | 2520 | struct ref_store *ref_store; |
2880d16f MH |
2521 | struct dir_iterator *dir_iterator; |
2522 | struct object_id oid; | |
2523 | }; | |
7bd9bcf3 | 2524 | |
2880d16f MH |
2525 | static int files_reflog_iterator_advance(struct ref_iterator *ref_iterator) |
2526 | { | |
2527 | struct files_reflog_iterator *iter = | |
2528 | (struct files_reflog_iterator *)ref_iterator; | |
2529 | struct dir_iterator *diter = iter->dir_iterator; | |
2530 | int ok; | |
2531 | ||
2532 | while ((ok = dir_iterator_advance(diter)) == ITER_OK) { | |
2533 | int flags; | |
2534 | ||
2535 | if (!S_ISREG(diter->st.st_mode)) | |
7bd9bcf3 | 2536 | continue; |
2880d16f MH |
2537 | if (diter->basename[0] == '.') |
2538 | continue; | |
2539 | if (ends_with(diter->basename, ".lock")) | |
7bd9bcf3 | 2540 | continue; |
7bd9bcf3 | 2541 | |
2f40e954 NTND |
2542 | if (refs_read_ref_full(iter->ref_store, |
2543 | diter->relative_path, 0, | |
2544 | iter->oid.hash, &flags)) { | |
2880d16f MH |
2545 | error("bad ref for %s", diter->path.buf); |
2546 | continue; | |
7bd9bcf3 | 2547 | } |
2880d16f MH |
2548 | |
2549 | iter->base.refname = diter->relative_path; | |
2550 | iter->base.oid = &iter->oid; | |
2551 | iter->base.flags = flags; | |
2552 | return ITER_OK; | |
7bd9bcf3 | 2553 | } |
2880d16f MH |
2554 | |
2555 | iter->dir_iterator = NULL; | |
2556 | if (ref_iterator_abort(ref_iterator) == ITER_ERROR) | |
2557 | ok = ITER_ERROR; | |
2558 | return ok; | |
2559 | } | |
2560 | ||
2561 | static int files_reflog_iterator_peel(struct ref_iterator *ref_iterator, | |
2562 | struct object_id *peeled) | |
2563 | { | |
2564 | die("BUG: ref_iterator_peel() called for reflog_iterator"); | |
2565 | } | |
2566 | ||
2567 | static int files_reflog_iterator_abort(struct ref_iterator *ref_iterator) | |
2568 | { | |
2569 | struct files_reflog_iterator *iter = | |
2570 | (struct files_reflog_iterator *)ref_iterator; | |
2571 | int ok = ITER_DONE; | |
2572 | ||
2573 | if (iter->dir_iterator) | |
2574 | ok = dir_iterator_abort(iter->dir_iterator); | |
2575 | ||
2576 | base_ref_iterator_free(ref_iterator); | |
2577 | return ok; | |
2578 | } | |
2579 | ||
2580 | static struct ref_iterator_vtable files_reflog_iterator_vtable = { | |
2581 | files_reflog_iterator_advance, | |
2582 | files_reflog_iterator_peel, | |
2583 | files_reflog_iterator_abort | |
2584 | }; | |
2585 | ||
e3688bd6 | 2586 | static struct ref_iterator *files_reflog_iterator_begin(struct ref_store *ref_store) |
2880d16f | 2587 | { |
802de3da | 2588 | struct files_ref_store *refs = |
9e7ec634 NTND |
2589 | files_downcast(ref_store, REF_STORE_READ, |
2590 | "reflog_iterator_begin"); | |
2880d16f MH |
2591 | struct files_reflog_iterator *iter = xcalloc(1, sizeof(*iter)); |
2592 | struct ref_iterator *ref_iterator = &iter->base; | |
e9dcc305 | 2593 | struct strbuf sb = STRBUF_INIT; |
2880d16f MH |
2594 | |
2595 | base_ref_iterator_init(ref_iterator, &files_reflog_iterator_vtable); | |
802de3da | 2596 | files_reflog_path(refs, &sb, NULL); |
e9dcc305 | 2597 | iter->dir_iterator = dir_iterator_begin(sb.buf); |
2f40e954 | 2598 | iter->ref_store = ref_store; |
e9dcc305 | 2599 | strbuf_release(&sb); |
2880d16f | 2600 | return ref_iterator; |
7bd9bcf3 MH |
2601 | } |
2602 | ||
7bd9bcf3 MH |
2603 | static int ref_update_reject_duplicates(struct string_list *refnames, |
2604 | struct strbuf *err) | |
2605 | { | |
2606 | int i, n = refnames->nr; | |
2607 | ||
2608 | assert(err); | |
2609 | ||
2610 | for (i = 1; i < n; i++) | |
2611 | if (!strcmp(refnames->items[i - 1].string, refnames->items[i].string)) { | |
2612 | strbuf_addf(err, | |
0568c8e9 | 2613 | "multiple updates for ref '%s' not allowed.", |
7bd9bcf3 MH |
2614 | refnames->items[i].string); |
2615 | return 1; | |
2616 | } | |
2617 | return 0; | |
2618 | } | |
2619 | ||
165056b2 | 2620 | /* |
92b1551b MH |
2621 | * If update is a direct update of head_ref (the reference pointed to |
2622 | * by HEAD), then add an extra REF_LOG_ONLY update for HEAD. | |
2623 | */ | |
2624 | static int split_head_update(struct ref_update *update, | |
2625 | struct ref_transaction *transaction, | |
2626 | const char *head_ref, | |
2627 | struct string_list *affected_refnames, | |
2628 | struct strbuf *err) | |
2629 | { | |
2630 | struct string_list_item *item; | |
2631 | struct ref_update *new_update; | |
2632 | ||
2633 | if ((update->flags & REF_LOG_ONLY) || | |
2634 | (update->flags & REF_ISPRUNING) || | |
2635 | (update->flags & REF_UPDATE_VIA_HEAD)) | |
2636 | return 0; | |
2637 | ||
2638 | if (strcmp(update->refname, head_ref)) | |
2639 | return 0; | |
2640 | ||
2641 | /* | |
2642 | * First make sure that HEAD is not already in the | |
2643 | * transaction. This insertion is O(N) in the transaction | |
2644 | * size, but it happens at most once per transaction. | |
2645 | */ | |
2646 | item = string_list_insert(affected_refnames, "HEAD"); | |
2647 | if (item->util) { | |
2648 | /* An entry already existed */ | |
2649 | strbuf_addf(err, | |
2650 | "multiple updates for 'HEAD' (including one " | |
2651 | "via its referent '%s') are not allowed", | |
2652 | update->refname); | |
2653 | return TRANSACTION_NAME_CONFLICT; | |
2654 | } | |
2655 | ||
2656 | new_update = ref_transaction_add_update( | |
2657 | transaction, "HEAD", | |
2658 | update->flags | REF_LOG_ONLY | REF_NODEREF, | |
2659 | update->new_sha1, update->old_sha1, | |
2660 | update->msg); | |
2661 | ||
2662 | item->util = new_update; | |
2663 | ||
2664 | return 0; | |
2665 | } | |
2666 | ||
2667 | /* | |
2668 | * update is for a symref that points at referent and doesn't have | |
2669 | * REF_NODEREF set. Split it into two updates: | |
2670 | * - The original update, but with REF_LOG_ONLY and REF_NODEREF set | |
2671 | * - A new, separate update for the referent reference | |
2672 | * Note that the new update will itself be subject to splitting when | |
2673 | * the iteration gets to it. | |
2674 | */ | |
fcc42ea0 MH |
2675 | static int split_symref_update(struct files_ref_store *refs, |
2676 | struct ref_update *update, | |
92b1551b MH |
2677 | const char *referent, |
2678 | struct ref_transaction *transaction, | |
2679 | struct string_list *affected_refnames, | |
2680 | struct strbuf *err) | |
2681 | { | |
2682 | struct string_list_item *item; | |
2683 | struct ref_update *new_update; | |
2684 | unsigned int new_flags; | |
2685 | ||
2686 | /* | |
2687 | * First make sure that referent is not already in the | |
2688 | * transaction. This insertion is O(N) in the transaction | |
2689 | * size, but it happens at most once per symref in a | |
2690 | * transaction. | |
2691 | */ | |
2692 | item = string_list_insert(affected_refnames, referent); | |
2693 | if (item->util) { | |
2694 | /* An entry already existed */ | |
2695 | strbuf_addf(err, | |
2696 | "multiple updates for '%s' (including one " | |
2697 | "via symref '%s') are not allowed", | |
2698 | referent, update->refname); | |
2699 | return TRANSACTION_NAME_CONFLICT; | |
2700 | } | |
2701 | ||
2702 | new_flags = update->flags; | |
2703 | if (!strcmp(update->refname, "HEAD")) { | |
2704 | /* | |
2705 | * Record that the new update came via HEAD, so that | |
2706 | * when we process it, split_head_update() doesn't try | |
2707 | * to add another reflog update for HEAD. Note that | |
2708 | * this bit will be propagated if the new_update | |
2709 | * itself needs to be split. | |
2710 | */ | |
2711 | new_flags |= REF_UPDATE_VIA_HEAD; | |
2712 | } | |
2713 | ||
2714 | new_update = ref_transaction_add_update( | |
2715 | transaction, referent, new_flags, | |
2716 | update->new_sha1, update->old_sha1, | |
2717 | update->msg); | |
2718 | ||
6e30b2f6 MH |
2719 | new_update->parent_update = update; |
2720 | ||
2721 | /* | |
2722 | * Change the symbolic ref update to log only. Also, it | |
2723 | * doesn't need to check its old SHA-1 value, as that will be | |
2724 | * done when new_update is processed. | |
2725 | */ | |
92b1551b | 2726 | update->flags |= REF_LOG_ONLY | REF_NODEREF; |
6e30b2f6 | 2727 | update->flags &= ~REF_HAVE_OLD; |
92b1551b MH |
2728 | |
2729 | item->util = new_update; | |
2730 | ||
2731 | return 0; | |
2732 | } | |
2733 | ||
6e30b2f6 MH |
2734 | /* |
2735 | * Return the refname under which update was originally requested. | |
2736 | */ | |
2737 | static const char *original_update_refname(struct ref_update *update) | |
2738 | { | |
2739 | while (update->parent_update) | |
2740 | update = update->parent_update; | |
2741 | ||
2742 | return update->refname; | |
2743 | } | |
2744 | ||
e3f51039 MH |
2745 | /* |
2746 | * Check whether the REF_HAVE_OLD and old_oid values stored in update | |
2747 | * are consistent with oid, which is the reference's current value. If | |
2748 | * everything is OK, return 0; otherwise, write an error message to | |
2749 | * err and return -1. | |
2750 | */ | |
2751 | static int check_old_oid(struct ref_update *update, struct object_id *oid, | |
2752 | struct strbuf *err) | |
2753 | { | |
2754 | if (!(update->flags & REF_HAVE_OLD) || | |
2755 | !hashcmp(oid->hash, update->old_sha1)) | |
2756 | return 0; | |
2757 | ||
2758 | if (is_null_sha1(update->old_sha1)) | |
2759 | strbuf_addf(err, "cannot lock ref '%s': " | |
2760 | "reference already exists", | |
2761 | original_update_refname(update)); | |
2762 | else if (is_null_oid(oid)) | |
2763 | strbuf_addf(err, "cannot lock ref '%s': " | |
2764 | "reference is missing but expected %s", | |
2765 | original_update_refname(update), | |
2766 | sha1_to_hex(update->old_sha1)); | |
2767 | else | |
2768 | strbuf_addf(err, "cannot lock ref '%s': " | |
2769 | "is at %s but expected %s", | |
2770 | original_update_refname(update), | |
2771 | oid_to_hex(oid), | |
2772 | sha1_to_hex(update->old_sha1)); | |
2773 | ||
2774 | return -1; | |
2775 | } | |
2776 | ||
92b1551b MH |
2777 | /* |
2778 | * Prepare for carrying out update: | |
2779 | * - Lock the reference referred to by update. | |
2780 | * - Read the reference under lock. | |
2781 | * - Check that its old SHA-1 value (if specified) is correct, and in | |
2782 | * any case record it in update->lock->old_oid for later use when | |
2783 | * writing the reflog. | |
2784 | * - If it is a symref update without REF_NODEREF, split it up into a | |
2785 | * REF_LOG_ONLY update of the symref and add a separate update for | |
2786 | * the referent to transaction. | |
2787 | * - If it is an update of head_ref, add a corresponding REF_LOG_ONLY | |
2788 | * update of HEAD. | |
165056b2 | 2789 | */ |
b3bbbc5c MH |
2790 | static int lock_ref_for_update(struct files_ref_store *refs, |
2791 | struct ref_update *update, | |
165056b2 | 2792 | struct ref_transaction *transaction, |
92b1551b | 2793 | const char *head_ref, |
165056b2 MH |
2794 | struct string_list *affected_refnames, |
2795 | struct strbuf *err) | |
2796 | { | |
92b1551b MH |
2797 | struct strbuf referent = STRBUF_INIT; |
2798 | int mustexist = (update->flags & REF_HAVE_OLD) && | |
2799 | !is_null_sha1(update->old_sha1); | |
165056b2 | 2800 | int ret; |
92b1551b | 2801 | struct ref_lock *lock; |
165056b2 | 2802 | |
32c597e7 | 2803 | files_assert_main_repository(refs, "lock_ref_for_update"); |
b3bbbc5c | 2804 | |
92b1551b | 2805 | if ((update->flags & REF_HAVE_NEW) && is_null_sha1(update->new_sha1)) |
165056b2 | 2806 | update->flags |= REF_DELETING; |
92b1551b MH |
2807 | |
2808 | if (head_ref) { | |
2809 | ret = split_head_update(update, transaction, head_ref, | |
2810 | affected_refnames, err); | |
2811 | if (ret) | |
2812 | return ret; | |
2813 | } | |
2814 | ||
f7b0a987 | 2815 | ret = lock_raw_ref(refs, update->refname, mustexist, |
92b1551b | 2816 | affected_refnames, NULL, |
7d618264 | 2817 | &lock, &referent, |
92b1551b | 2818 | &update->type, err); |
92b1551b | 2819 | if (ret) { |
165056b2 MH |
2820 | char *reason; |
2821 | ||
165056b2 MH |
2822 | reason = strbuf_detach(err, NULL); |
2823 | strbuf_addf(err, "cannot lock ref '%s': %s", | |
e3f51039 | 2824 | original_update_refname(update), reason); |
165056b2 MH |
2825 | free(reason); |
2826 | return ret; | |
2827 | } | |
92b1551b | 2828 | |
7d618264 | 2829 | update->backend_data = lock; |
92b1551b | 2830 | |
8169d0d0 | 2831 | if (update->type & REF_ISSYMREF) { |
6e30b2f6 MH |
2832 | if (update->flags & REF_NODEREF) { |
2833 | /* | |
2834 | * We won't be reading the referent as part of | |
2835 | * the transaction, so we have to read it here | |
2836 | * to record and possibly check old_sha1: | |
2837 | */ | |
2f40e954 NTND |
2838 | if (refs_read_ref_full(&refs->base, |
2839 | referent.buf, 0, | |
2840 | lock->old_oid.hash, NULL)) { | |
6e30b2f6 MH |
2841 | if (update->flags & REF_HAVE_OLD) { |
2842 | strbuf_addf(err, "cannot lock ref '%s': " | |
e3f51039 MH |
2843 | "error reading reference", |
2844 | original_update_refname(update)); | |
2845 | return -1; | |
6e30b2f6 | 2846 | } |
e3f51039 | 2847 | } else if (check_old_oid(update, &lock->old_oid, err)) { |
8169d0d0 | 2848 | return TRANSACTION_GENERIC_ERROR; |
8169d0d0 | 2849 | } |
6e30b2f6 MH |
2850 | } else { |
2851 | /* | |
2852 | * Create a new update for the reference this | |
2853 | * symref is pointing at. Also, we will record | |
2854 | * and verify old_sha1 for this update as part | |
2855 | * of processing the split-off update, so we | |
2856 | * don't have to do it here. | |
2857 | */ | |
fcc42ea0 MH |
2858 | ret = split_symref_update(refs, update, |
2859 | referent.buf, transaction, | |
92b1551b MH |
2860 | affected_refnames, err); |
2861 | if (ret) | |
2862 | return ret; | |
2863 | } | |
6e30b2f6 MH |
2864 | } else { |
2865 | struct ref_update *parent_update; | |
8169d0d0 | 2866 | |
e3f51039 MH |
2867 | if (check_old_oid(update, &lock->old_oid, err)) |
2868 | return TRANSACTION_GENERIC_ERROR; | |
2869 | ||
6e30b2f6 MH |
2870 | /* |
2871 | * If this update is happening indirectly because of a | |
2872 | * symref update, record the old SHA-1 in the parent | |
2873 | * update: | |
2874 | */ | |
2875 | for (parent_update = update->parent_update; | |
2876 | parent_update; | |
2877 | parent_update = parent_update->parent_update) { | |
7d618264 DT |
2878 | struct ref_lock *parent_lock = parent_update->backend_data; |
2879 | oidcpy(&parent_lock->old_oid, &lock->old_oid); | |
6e30b2f6 | 2880 | } |
92b1551b MH |
2881 | } |
2882 | ||
165056b2 MH |
2883 | if ((update->flags & REF_HAVE_NEW) && |
2884 | !(update->flags & REF_DELETING) && | |
2885 | !(update->flags & REF_LOG_ONLY)) { | |
92b1551b MH |
2886 | if (!(update->type & REF_ISSYMREF) && |
2887 | !hashcmp(lock->old_oid.hash, update->new_sha1)) { | |
165056b2 MH |
2888 | /* |
2889 | * The reference already has the desired | |
2890 | * value, so we don't need to write it. | |
2891 | */ | |
92b1551b | 2892 | } else if (write_ref_to_lockfile(lock, update->new_sha1, |
165056b2 MH |
2893 | err)) { |
2894 | char *write_err = strbuf_detach(err, NULL); | |
2895 | ||
2896 | /* | |
2897 | * The lock was freed upon failure of | |
2898 | * write_ref_to_lockfile(): | |
2899 | */ | |
7d618264 | 2900 | update->backend_data = NULL; |
165056b2 | 2901 | strbuf_addf(err, |
e3f51039 | 2902 | "cannot update ref '%s': %s", |
165056b2 MH |
2903 | update->refname, write_err); |
2904 | free(write_err); | |
2905 | return TRANSACTION_GENERIC_ERROR; | |
2906 | } else { | |
2907 | update->flags |= REF_NEEDS_COMMIT; | |
2908 | } | |
2909 | } | |
2910 | if (!(update->flags & REF_NEEDS_COMMIT)) { | |
2911 | /* | |
2912 | * We didn't call write_ref_to_lockfile(), so | |
2913 | * the lockfile is still open. Close it to | |
2914 | * free up the file descriptor: | |
2915 | */ | |
92b1551b | 2916 | if (close_ref(lock)) { |
165056b2 MH |
2917 | strbuf_addf(err, "couldn't close '%s.lock'", |
2918 | update->refname); | |
2919 | return TRANSACTION_GENERIC_ERROR; | |
2920 | } | |
2921 | } | |
2922 | return 0; | |
2923 | } | |
2924 | ||
127b42a1 RS |
2925 | static int files_transaction_commit(struct ref_store *ref_store, |
2926 | struct ref_transaction *transaction, | |
2927 | struct strbuf *err) | |
7bd9bcf3 | 2928 | { |
00eebe35 | 2929 | struct files_ref_store *refs = |
9e7ec634 NTND |
2930 | files_downcast(ref_store, REF_STORE_WRITE, |
2931 | "ref_transaction_commit"); | |
7bd9bcf3 | 2932 | int ret = 0, i; |
7bd9bcf3 MH |
2933 | struct string_list refs_to_delete = STRING_LIST_INIT_NODUP; |
2934 | struct string_list_item *ref_to_delete; | |
2935 | struct string_list affected_refnames = STRING_LIST_INIT_NODUP; | |
92b1551b MH |
2936 | char *head_ref = NULL; |
2937 | int head_type; | |
2938 | struct object_id head_oid; | |
e9dcc305 | 2939 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 MH |
2940 | |
2941 | assert(err); | |
2942 | ||
2943 | if (transaction->state != REF_TRANSACTION_OPEN) | |
2944 | die("BUG: commit called for transaction that is not open"); | |
2945 | ||
efe47281 | 2946 | if (!transaction->nr) { |
7bd9bcf3 MH |
2947 | transaction->state = REF_TRANSACTION_CLOSED; |
2948 | return 0; | |
2949 | } | |
2950 | ||
92b1551b MH |
2951 | /* |
2952 | * Fail if a refname appears more than once in the | |
2953 | * transaction. (If we end up splitting up any updates using | |
2954 | * split_symref_update() or split_head_update(), those | |
2955 | * functions will check that the new updates don't have the | |
2956 | * same refname as any existing ones.) | |
2957 | */ | |
2958 | for (i = 0; i < transaction->nr; i++) { | |
2959 | struct ref_update *update = transaction->updates[i]; | |
2960 | struct string_list_item *item = | |
2961 | string_list_append(&affected_refnames, update->refname); | |
2962 | ||
2963 | /* | |
2964 | * We store a pointer to update in item->util, but at | |
2965 | * the moment we never use the value of this field | |
2966 | * except to check whether it is non-NULL. | |
2967 | */ | |
2968 | item->util = update; | |
2969 | } | |
7bd9bcf3 MH |
2970 | string_list_sort(&affected_refnames); |
2971 | if (ref_update_reject_duplicates(&affected_refnames, err)) { | |
2972 | ret = TRANSACTION_GENERIC_ERROR; | |
2973 | goto cleanup; | |
2974 | } | |
2975 | ||
92b1551b MH |
2976 | /* |
2977 | * Special hack: If a branch is updated directly and HEAD | |
2978 | * points to it (may happen on the remote side of a push | |
2979 | * for example) then logically the HEAD reflog should be | |
2980 | * updated too. | |
2981 | * | |
2982 | * A generic solution would require reverse symref lookups, | |
2983 | * but finding all symrefs pointing to a given branch would be | |
2984 | * rather costly for this rare event (the direct update of a | |
2985 | * branch) to be worth it. So let's cheat and check with HEAD | |
2986 | * only, which should cover 99% of all usage scenarios (even | |
2987 | * 100% of the default ones). | |
2988 | * | |
2989 | * So if HEAD is a symbolic reference, then record the name of | |
2990 | * the reference that it points to. If we see an update of | |
2991 | * head_ref within the transaction, then split_head_update() | |
2992 | * arranges for the reflog of HEAD to be updated, too. | |
2993 | */ | |
2f40e954 NTND |
2994 | head_ref = refs_resolve_refdup(ref_store, "HEAD", |
2995 | RESOLVE_REF_NO_RECURSE, | |
2996 | head_oid.hash, &head_type); | |
92b1551b MH |
2997 | |
2998 | if (head_ref && !(head_type & REF_ISSYMREF)) { | |
2999 | free(head_ref); | |
3000 | head_ref = NULL; | |
3001 | } | |
3002 | ||
7bd9bcf3 MH |
3003 | /* |
3004 | * Acquire all locks, verify old values if provided, check | |
3005 | * that new values are valid, and write new values to the | |
3006 | * lockfiles, ready to be activated. Only keep one lockfile | |
3007 | * open at a time to avoid running out of file descriptors. | |
3008 | */ | |
efe47281 MH |
3009 | for (i = 0; i < transaction->nr; i++) { |
3010 | struct ref_update *update = transaction->updates[i]; | |
7bd9bcf3 | 3011 | |
b3bbbc5c MH |
3012 | ret = lock_ref_for_update(refs, update, transaction, |
3013 | head_ref, &affected_refnames, err); | |
165056b2 | 3014 | if (ret) |
7bd9bcf3 | 3015 | goto cleanup; |
7bd9bcf3 | 3016 | } |
7bd9bcf3 | 3017 | |
7bd9bcf3 | 3018 | /* Perform updates first so live commits remain referenced */ |
efe47281 MH |
3019 | for (i = 0; i < transaction->nr; i++) { |
3020 | struct ref_update *update = transaction->updates[i]; | |
7d618264 | 3021 | struct ref_lock *lock = update->backend_data; |
7bd9bcf3 | 3022 | |
d99aa884 DT |
3023 | if (update->flags & REF_NEEDS_COMMIT || |
3024 | update->flags & REF_LOG_ONLY) { | |
802de3da NTND |
3025 | if (files_log_ref_write(refs, |
3026 | lock->ref_name, | |
81b1b6d4 MH |
3027 | lock->old_oid.hash, |
3028 | update->new_sha1, | |
3029 | update->msg, update->flags, | |
3030 | err)) { | |
92b1551b MH |
3031 | char *old_msg = strbuf_detach(err, NULL); |
3032 | ||
3033 | strbuf_addf(err, "cannot update the ref '%s': %s", | |
3034 | lock->ref_name, old_msg); | |
3035 | free(old_msg); | |
3036 | unlock_ref(lock); | |
7d618264 | 3037 | update->backend_data = NULL; |
7bd9bcf3 MH |
3038 | ret = TRANSACTION_GENERIC_ERROR; |
3039 | goto cleanup; | |
7bd9bcf3 MH |
3040 | } |
3041 | } | |
7bd9bcf3 | 3042 | if (update->flags & REF_NEEDS_COMMIT) { |
00eebe35 | 3043 | clear_loose_ref_cache(refs); |
92b1551b MH |
3044 | if (commit_ref(lock)) { |
3045 | strbuf_addf(err, "couldn't set '%s'", lock->ref_name); | |
3046 | unlock_ref(lock); | |
7d618264 | 3047 | update->backend_data = NULL; |
7bd9bcf3 MH |
3048 | ret = TRANSACTION_GENERIC_ERROR; |
3049 | goto cleanup; | |
7bd9bcf3 MH |
3050 | } |
3051 | } | |
3052 | } | |
7bd9bcf3 | 3053 | /* Perform deletes now that updates are safely completed */ |
efe47281 MH |
3054 | for (i = 0; i < transaction->nr; i++) { |
3055 | struct ref_update *update = transaction->updates[i]; | |
7d618264 | 3056 | struct ref_lock *lock = update->backend_data; |
7bd9bcf3 | 3057 | |
d99aa884 DT |
3058 | if (update->flags & REF_DELETING && |
3059 | !(update->flags & REF_LOG_ONLY)) { | |
ce0af24d MH |
3060 | if (!(update->type & REF_ISPACKED) || |
3061 | update->type & REF_ISSYMREF) { | |
3062 | /* It is a loose reference. */ | |
e9dcc305 | 3063 | strbuf_reset(&sb); |
19e02f4f | 3064 | files_ref_path(refs, &sb, lock->ref_name); |
e9dcc305 | 3065 | if (unlink_or_msg(sb.buf, err)) { |
ce0af24d MH |
3066 | ret = TRANSACTION_GENERIC_ERROR; |
3067 | goto cleanup; | |
3068 | } | |
44639777 | 3069 | update->flags |= REF_DELETED_LOOSE; |
7bd9bcf3 MH |
3070 | } |
3071 | ||
3072 | if (!(update->flags & REF_ISPRUNING)) | |
3073 | string_list_append(&refs_to_delete, | |
7d618264 | 3074 | lock->ref_name); |
7bd9bcf3 MH |
3075 | } |
3076 | } | |
3077 | ||
0a95ac5f | 3078 | if (repack_without_refs(refs, &refs_to_delete, err)) { |
7bd9bcf3 MH |
3079 | ret = TRANSACTION_GENERIC_ERROR; |
3080 | goto cleanup; | |
3081 | } | |
44639777 MH |
3082 | |
3083 | /* Delete the reflogs of any references that were deleted: */ | |
3084 | for_each_string_list_item(ref_to_delete, &refs_to_delete) { | |
e9dcc305 | 3085 | strbuf_reset(&sb); |
802de3da | 3086 | files_reflog_path(refs, &sb, ref_to_delete->string); |
e9dcc305 | 3087 | if (!unlink_or_warn(sb.buf)) |
802de3da | 3088 | try_remove_empty_parents(refs, ref_to_delete->string, |
44639777 MH |
3089 | REMOVE_EMPTY_PARENTS_REFLOG); |
3090 | } | |
3091 | ||
00eebe35 | 3092 | clear_loose_ref_cache(refs); |
7bd9bcf3 MH |
3093 | |
3094 | cleanup: | |
e9dcc305 | 3095 | strbuf_release(&sb); |
7bd9bcf3 MH |
3096 | transaction->state = REF_TRANSACTION_CLOSED; |
3097 | ||
44639777 MH |
3098 | for (i = 0; i < transaction->nr; i++) { |
3099 | struct ref_update *update = transaction->updates[i]; | |
3100 | struct ref_lock *lock = update->backend_data; | |
3101 | ||
3102 | if (lock) | |
3103 | unlock_ref(lock); | |
3104 | ||
3105 | if (update->flags & REF_DELETED_LOOSE) { | |
3106 | /* | |
3107 | * The loose reference was deleted. Delete any | |
3108 | * empty parent directories. (Note that this | |
3109 | * can only work because we have already | |
3110 | * removed the lockfile.) | |
3111 | */ | |
802de3da | 3112 | try_remove_empty_parents(refs, update->refname, |
44639777 MH |
3113 | REMOVE_EMPTY_PARENTS_REF); |
3114 | } | |
3115 | } | |
3116 | ||
7bd9bcf3 | 3117 | string_list_clear(&refs_to_delete, 0); |
92b1551b | 3118 | free(head_ref); |
7bd9bcf3 | 3119 | string_list_clear(&affected_refnames, 0); |
92b1551b | 3120 | |
7bd9bcf3 MH |
3121 | return ret; |
3122 | } | |
3123 | ||
3124 | static int ref_present(const char *refname, | |
3125 | const struct object_id *oid, int flags, void *cb_data) | |
3126 | { | |
3127 | struct string_list *affected_refnames = cb_data; | |
3128 | ||
3129 | return string_list_has_string(affected_refnames, refname); | |
3130 | } | |
3131 | ||
fc681463 DT |
3132 | static int files_initial_transaction_commit(struct ref_store *ref_store, |
3133 | struct ref_transaction *transaction, | |
3134 | struct strbuf *err) | |
7bd9bcf3 | 3135 | { |
d99825ab | 3136 | struct files_ref_store *refs = |
9e7ec634 NTND |
3137 | files_downcast(ref_store, REF_STORE_WRITE, |
3138 | "initial_ref_transaction_commit"); | |
7bd9bcf3 | 3139 | int ret = 0, i; |
7bd9bcf3 MH |
3140 | struct string_list affected_refnames = STRING_LIST_INIT_NODUP; |
3141 | ||
3142 | assert(err); | |
3143 | ||
3144 | if (transaction->state != REF_TRANSACTION_OPEN) | |
3145 | die("BUG: commit called for transaction that is not open"); | |
3146 | ||
3147 | /* Fail if a refname appears more than once in the transaction: */ | |
efe47281 MH |
3148 | for (i = 0; i < transaction->nr; i++) |
3149 | string_list_append(&affected_refnames, | |
3150 | transaction->updates[i]->refname); | |
7bd9bcf3 MH |
3151 | string_list_sort(&affected_refnames); |
3152 | if (ref_update_reject_duplicates(&affected_refnames, err)) { | |
3153 | ret = TRANSACTION_GENERIC_ERROR; | |
3154 | goto cleanup; | |
3155 | } | |
3156 | ||
3157 | /* | |
3158 | * It's really undefined to call this function in an active | |
3159 | * repository or when there are existing references: we are | |
3160 | * only locking and changing packed-refs, so (1) any | |
3161 | * simultaneous processes might try to change a reference at | |
3162 | * the same time we do, and (2) any existing loose versions of | |
3163 | * the references that we are setting would have precedence | |
3164 | * over our values. But some remote helpers create the remote | |
3165 | * "HEAD" and "master" branches before calling this function, | |
3166 | * so here we really only check that none of the references | |
3167 | * that we are creating already exists. | |
3168 | */ | |
2f40e954 NTND |
3169 | if (refs_for_each_rawref(&refs->base, ref_present, |
3170 | &affected_refnames)) | |
7bd9bcf3 MH |
3171 | die("BUG: initial ref transaction called with existing refs"); |
3172 | ||
efe47281 MH |
3173 | for (i = 0; i < transaction->nr; i++) { |
3174 | struct ref_update *update = transaction->updates[i]; | |
7bd9bcf3 MH |
3175 | |
3176 | if ((update->flags & REF_HAVE_OLD) && | |
3177 | !is_null_sha1(update->old_sha1)) | |
3178 | die("BUG: initial ref transaction with old_sha1 set"); | |
7d2df051 NTND |
3179 | if (refs_verify_refname_available(&refs->base, update->refname, |
3180 | &affected_refnames, NULL, | |
3181 | err)) { | |
7bd9bcf3 MH |
3182 | ret = TRANSACTION_NAME_CONFLICT; |
3183 | goto cleanup; | |
3184 | } | |
3185 | } | |
3186 | ||
49c0df6a | 3187 | if (lock_packed_refs(refs, 0)) { |
7bd9bcf3 MH |
3188 | strbuf_addf(err, "unable to lock packed-refs file: %s", |
3189 | strerror(errno)); | |
3190 | ret = TRANSACTION_GENERIC_ERROR; | |
3191 | goto cleanup; | |
3192 | } | |
3193 | ||
efe47281 MH |
3194 | for (i = 0; i < transaction->nr; i++) { |
3195 | struct ref_update *update = transaction->updates[i]; | |
7bd9bcf3 MH |
3196 | |
3197 | if ((update->flags & REF_HAVE_NEW) && | |
3198 | !is_null_sha1(update->new_sha1)) | |
d99825ab | 3199 | add_packed_ref(refs, update->refname, update->new_sha1); |
7bd9bcf3 MH |
3200 | } |
3201 | ||
49c0df6a | 3202 | if (commit_packed_refs(refs)) { |
7bd9bcf3 MH |
3203 | strbuf_addf(err, "unable to commit packed-refs file: %s", |
3204 | strerror(errno)); | |
3205 | ret = TRANSACTION_GENERIC_ERROR; | |
3206 | goto cleanup; | |
3207 | } | |
3208 | ||
3209 | cleanup: | |
3210 | transaction->state = REF_TRANSACTION_CLOSED; | |
3211 | string_list_clear(&affected_refnames, 0); | |
3212 | return ret; | |
3213 | } | |
3214 | ||
3215 | struct expire_reflog_cb { | |
3216 | unsigned int flags; | |
3217 | reflog_expiry_should_prune_fn *should_prune_fn; | |
3218 | void *policy_cb; | |
3219 | FILE *newlog; | |
9461d272 | 3220 | struct object_id last_kept_oid; |
7bd9bcf3 MH |
3221 | }; |
3222 | ||
9461d272 | 3223 | static int expire_reflog_ent(struct object_id *ooid, struct object_id *noid, |
7bd9bcf3 MH |
3224 | const char *email, unsigned long timestamp, int tz, |
3225 | const char *message, void *cb_data) | |
3226 | { | |
3227 | struct expire_reflog_cb *cb = cb_data; | |
3228 | struct expire_reflog_policy_cb *policy_cb = cb->policy_cb; | |
3229 | ||
3230 | if (cb->flags & EXPIRE_REFLOGS_REWRITE) | |
9461d272 | 3231 | ooid = &cb->last_kept_oid; |
7bd9bcf3 | 3232 | |
9461d272 | 3233 | if ((*cb->should_prune_fn)(ooid->hash, noid->hash, email, timestamp, tz, |
7bd9bcf3 MH |
3234 | message, policy_cb)) { |
3235 | if (!cb->newlog) | |
3236 | printf("would prune %s", message); | |
3237 | else if (cb->flags & EXPIRE_REFLOGS_VERBOSE) | |
3238 | printf("prune %s", message); | |
3239 | } else { | |
3240 | if (cb->newlog) { | |
3241 | fprintf(cb->newlog, "%s %s %s %lu %+05d\t%s", | |
9461d272 | 3242 | oid_to_hex(ooid), oid_to_hex(noid), |
7bd9bcf3 | 3243 | email, timestamp, tz, message); |
9461d272 | 3244 | oidcpy(&cb->last_kept_oid, noid); |
7bd9bcf3 MH |
3245 | } |
3246 | if (cb->flags & EXPIRE_REFLOGS_VERBOSE) | |
3247 | printf("keep %s", message); | |
3248 | } | |
3249 | return 0; | |
3250 | } | |
3251 | ||
e3688bd6 DT |
3252 | static int files_reflog_expire(struct ref_store *ref_store, |
3253 | const char *refname, const unsigned char *sha1, | |
3254 | unsigned int flags, | |
3255 | reflog_expiry_prepare_fn prepare_fn, | |
3256 | reflog_expiry_should_prune_fn should_prune_fn, | |
3257 | reflog_expiry_cleanup_fn cleanup_fn, | |
3258 | void *policy_cb_data) | |
7bd9bcf3 | 3259 | { |
7eb27cdf | 3260 | struct files_ref_store *refs = |
9e7ec634 | 3261 | files_downcast(ref_store, REF_STORE_WRITE, "reflog_expire"); |
7bd9bcf3 MH |
3262 | static struct lock_file reflog_lock; |
3263 | struct expire_reflog_cb cb; | |
3264 | struct ref_lock *lock; | |
802de3da | 3265 | struct strbuf log_file_sb = STRBUF_INIT; |
7bd9bcf3 MH |
3266 | char *log_file; |
3267 | int status = 0; | |
3268 | int type; | |
3269 | struct strbuf err = STRBUF_INIT; | |
3270 | ||
3271 | memset(&cb, 0, sizeof(cb)); | |
3272 | cb.flags = flags; | |
3273 | cb.policy_cb = policy_cb_data; | |
3274 | cb.should_prune_fn = should_prune_fn; | |
3275 | ||
3276 | /* | |
3277 | * The reflog file is locked by holding the lock on the | |
3278 | * reference itself, plus we might need to update the | |
3279 | * reference if --updateref was specified: | |
3280 | */ | |
7eb27cdf MH |
3281 | lock = lock_ref_sha1_basic(refs, refname, sha1, |
3282 | NULL, NULL, REF_NODEREF, | |
41d796ed | 3283 | &type, &err); |
7bd9bcf3 MH |
3284 | if (!lock) { |
3285 | error("cannot lock ref '%s': %s", refname, err.buf); | |
3286 | strbuf_release(&err); | |
3287 | return -1; | |
3288 | } | |
2f40e954 | 3289 | if (!refs_reflog_exists(ref_store, refname)) { |
7bd9bcf3 MH |
3290 | unlock_ref(lock); |
3291 | return 0; | |
3292 | } | |
3293 | ||
802de3da NTND |
3294 | files_reflog_path(refs, &log_file_sb, refname); |
3295 | log_file = strbuf_detach(&log_file_sb, NULL); | |
7bd9bcf3 MH |
3296 | if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) { |
3297 | /* | |
3298 | * Even though holding $GIT_DIR/logs/$reflog.lock has | |
3299 | * no locking implications, we use the lock_file | |
3300 | * machinery here anyway because it does a lot of the | |
3301 | * work we need, including cleaning up if the program | |
3302 | * exits unexpectedly. | |
3303 | */ | |
3304 | if (hold_lock_file_for_update(&reflog_lock, log_file, 0) < 0) { | |
3305 | struct strbuf err = STRBUF_INIT; | |
3306 | unable_to_lock_message(log_file, errno, &err); | |
3307 | error("%s", err.buf); | |
3308 | strbuf_release(&err); | |
3309 | goto failure; | |
3310 | } | |
3311 | cb.newlog = fdopen_lock_file(&reflog_lock, "w"); | |
3312 | if (!cb.newlog) { | |
3313 | error("cannot fdopen %s (%s)", | |
3314 | get_lock_file_path(&reflog_lock), strerror(errno)); | |
3315 | goto failure; | |
3316 | } | |
3317 | } | |
3318 | ||
3319 | (*prepare_fn)(refname, sha1, cb.policy_cb); | |
2f40e954 | 3320 | refs_for_each_reflog_ent(ref_store, refname, expire_reflog_ent, &cb); |
7bd9bcf3 MH |
3321 | (*cleanup_fn)(cb.policy_cb); |
3322 | ||
3323 | if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) { | |
3324 | /* | |
3325 | * It doesn't make sense to adjust a reference pointed | |
3326 | * to by a symbolic ref based on expiring entries in | |
3327 | * the symbolic reference's reflog. Nor can we update | |
3328 | * a reference if there are no remaining reflog | |
3329 | * entries. | |
3330 | */ | |
3331 | int update = (flags & EXPIRE_REFLOGS_UPDATE_REF) && | |
3332 | !(type & REF_ISSYMREF) && | |
9461d272 | 3333 | !is_null_oid(&cb.last_kept_oid); |
7bd9bcf3 MH |
3334 | |
3335 | if (close_lock_file(&reflog_lock)) { | |
3336 | status |= error("couldn't write %s: %s", log_file, | |
3337 | strerror(errno)); | |
3338 | } else if (update && | |
3339 | (write_in_full(get_lock_file_fd(lock->lk), | |
9461d272 | 3340 | oid_to_hex(&cb.last_kept_oid), GIT_SHA1_HEXSZ) != GIT_SHA1_HEXSZ || |
7bd9bcf3 MH |
3341 | write_str_in_full(get_lock_file_fd(lock->lk), "\n") != 1 || |
3342 | close_ref(lock) < 0)) { | |
3343 | status |= error("couldn't write %s", | |
3344 | get_lock_file_path(lock->lk)); | |
3345 | rollback_lock_file(&reflog_lock); | |
3346 | } else if (commit_lock_file(&reflog_lock)) { | |
e0048d3e | 3347 | status |= error("unable to write reflog '%s' (%s)", |
7bd9bcf3 MH |
3348 | log_file, strerror(errno)); |
3349 | } else if (update && commit_ref(lock)) { | |
3350 | status |= error("couldn't set %s", lock->ref_name); | |
3351 | } | |
3352 | } | |
3353 | free(log_file); | |
3354 | unlock_ref(lock); | |
3355 | return status; | |
3356 | ||
3357 | failure: | |
3358 | rollback_lock_file(&reflog_lock); | |
3359 | free(log_file); | |
3360 | unlock_ref(lock); | |
3361 | return -1; | |
3362 | } | |
3dce444f | 3363 | |
6fb5acfd DT |
3364 | static int files_init_db(struct ref_store *ref_store, struct strbuf *err) |
3365 | { | |
19e02f4f | 3366 | struct files_ref_store *refs = |
9e7ec634 | 3367 | files_downcast(ref_store, REF_STORE_WRITE, "init_db"); |
e9dcc305 NTND |
3368 | struct strbuf sb = STRBUF_INIT; |
3369 | ||
6fb5acfd DT |
3370 | /* |
3371 | * Create .git/refs/{heads,tags} | |
3372 | */ | |
19e02f4f | 3373 | files_ref_path(refs, &sb, "refs/heads"); |
e9dcc305 NTND |
3374 | safe_create_dir(sb.buf, 1); |
3375 | ||
3376 | strbuf_reset(&sb); | |
19e02f4f | 3377 | files_ref_path(refs, &sb, "refs/tags"); |
e9dcc305 NTND |
3378 | safe_create_dir(sb.buf, 1); |
3379 | ||
3380 | strbuf_release(&sb); | |
6fb5acfd DT |
3381 | return 0; |
3382 | } | |
3383 | ||
3dce444f RS |
3384 | struct ref_storage_be refs_be_files = { |
3385 | NULL, | |
00eebe35 | 3386 | "files", |
127b42a1 | 3387 | files_ref_store_create, |
6fb5acfd | 3388 | files_init_db, |
e1e33b72 | 3389 | files_transaction_commit, |
fc681463 | 3390 | files_initial_transaction_commit, |
e1e33b72 | 3391 | |
8231527e | 3392 | files_pack_refs, |
bd427cf2 | 3393 | files_peel_ref, |
284689ba | 3394 | files_create_symref, |
a27dcf89 | 3395 | files_delete_refs, |
9b6b40d9 | 3396 | files_rename_ref, |
8231527e | 3397 | |
1a769003 | 3398 | files_ref_iterator_begin, |
62665823 | 3399 | files_read_raw_ref, |
e3688bd6 DT |
3400 | |
3401 | files_reflog_iterator_begin, | |
3402 | files_for_each_reflog_ent, | |
3403 | files_for_each_reflog_ent_reverse, | |
3404 | files_reflog_exists, | |
3405 | files_create_reflog, | |
3406 | files_delete_reflog, | |
3407 | files_reflog_expire | |
3dce444f | 3408 | }; |