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