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Commit | Line | Data |
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7bd9bcf3 | 1 | #include "../cache.h" |
b2141fc1 | 2 | #include "../config.h" |
7bd9bcf3 MH |
3 | #include "../refs.h" |
4 | #include "refs-internal.h" | |
958f9646 | 5 | #include "ref-cache.h" |
67be7c5a | 6 | #include "packed-backend.h" |
3bc581b9 | 7 | #include "../iterator.h" |
2880d16f | 8 | #include "../dir-iterator.h" |
7bd9bcf3 MH |
9 | #include "../lockfile.h" |
10 | #include "../object.h" | |
11 | #include "../dir.h" | |
fb9c2d27 | 12 | #include "../chdir-notify.h" |
7bd9bcf3 | 13 | |
5ac95fee MH |
14 | /* |
15 | * This backend uses the following flags in `ref_update::flags` for | |
16 | * internal bookkeeping purposes. Their numerical values must not | |
91774afc | 17 | * conflict with REF_NO_DEREF, REF_FORCE_CREATE_REFLOG, REF_HAVE_NEW, |
acedcde7 | 18 | * REF_HAVE_OLD, or REF_IS_PRUNING, which are also stored in |
5ac95fee MH |
19 | * `ref_update::flags`. |
20 | */ | |
21 | ||
22 | /* | |
23 | * Used as a flag in ref_update::flags when a loose ref is being | |
91774afc | 24 | * pruned. This flag must only be used when REF_NO_DEREF is set. |
5ac95fee | 25 | */ |
acedcde7 | 26 | #define REF_IS_PRUNING (1 << 4) |
5ac95fee MH |
27 | |
28 | /* | |
29 | * Flag passed to lock_ref_sha1_basic() telling it to tolerate broken | |
30 | * refs (i.e., because the reference is about to be deleted anyway). | |
31 | */ | |
32 | #define REF_DELETING (1 << 5) | |
33 | ||
34 | /* | |
35 | * Used as a flag in ref_update::flags when the lockfile needs to be | |
36 | * committed. | |
37 | */ | |
38 | #define REF_NEEDS_COMMIT (1 << 6) | |
39 | ||
40 | /* | |
41 | * Used as a flag in ref_update::flags when we want to log a ref | |
42 | * update but not actually perform it. This is used when a symbolic | |
43 | * ref update is split up. | |
44 | */ | |
45 | #define REF_LOG_ONLY (1 << 7) | |
46 | ||
47 | /* | |
48 | * Used as a flag in ref_update::flags when the ref_update was via an | |
49 | * update to HEAD. | |
50 | */ | |
51 | #define REF_UPDATE_VIA_HEAD (1 << 8) | |
52 | ||
53 | /* | |
54 | * Used as a flag in ref_update::flags when the loose reference has | |
55 | * been deleted. | |
56 | */ | |
57 | #define REF_DELETED_LOOSE (1 << 9) | |
58 | ||
7bd9bcf3 MH |
59 | struct ref_lock { |
60 | char *ref_name; | |
ee4d8e45 | 61 | struct lock_file lk; |
7bd9bcf3 MH |
62 | struct object_id old_oid; |
63 | }; | |
64 | ||
00eebe35 MH |
65 | struct files_ref_store { |
66 | struct ref_store base; | |
9e7ec634 | 67 | unsigned int store_flags; |
32c597e7 | 68 | |
f57f37e2 NTND |
69 | char *gitdir; |
70 | char *gitcommondir; | |
33dfb9f3 | 71 | |
7c22bc8a | 72 | struct ref_cache *loose; |
55c6bc37 | 73 | |
e0cc8ac8 | 74 | struct ref_store *packed_ref_store; |
00eebe35 | 75 | }; |
7bd9bcf3 | 76 | |
65a0a8e5 | 77 | static void clear_loose_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 MH |
78 | { |
79 | if (refs->loose) { | |
7c22bc8a | 80 | free_ref_cache(refs->loose); |
7bd9bcf3 MH |
81 | refs->loose = NULL; |
82 | } | |
83 | } | |
84 | ||
a2d5156c JK |
85 | /* |
86 | * Create a new submodule ref cache and add it to the internal | |
87 | * set of caches. | |
88 | */ | |
9e7ec634 NTND |
89 | static struct ref_store *files_ref_store_create(const char *gitdir, |
90 | unsigned int flags) | |
7bd9bcf3 | 91 | { |
00eebe35 MH |
92 | struct files_ref_store *refs = xcalloc(1, sizeof(*refs)); |
93 | struct ref_store *ref_store = (struct ref_store *)refs; | |
f57f37e2 | 94 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 | 95 | |
fbfd0a29 | 96 | base_ref_store_init(ref_store, &refs_be_files); |
9e7ec634 | 97 | refs->store_flags = flags; |
7bd9bcf3 | 98 | |
f57f37e2 NTND |
99 | refs->gitdir = xstrdup(gitdir); |
100 | get_common_dir_noenv(&sb, gitdir); | |
101 | refs->gitcommondir = strbuf_detach(&sb, NULL); | |
102 | strbuf_addf(&sb, "%s/packed-refs", refs->gitcommondir); | |
e0d48397 MH |
103 | refs->packed_ref_store = packed_ref_store_create(sb.buf, flags); |
104 | strbuf_release(&sb); | |
7bd9bcf3 | 105 | |
fb9c2d27 JK |
106 | chdir_notify_reparent("files-backend $GIT_DIR", |
107 | &refs->gitdir); | |
108 | chdir_notify_reparent("files-backend $GIT_COMMONDIR", | |
109 | &refs->gitcommondir); | |
110 | ||
00eebe35 | 111 | return ref_store; |
a2d5156c | 112 | } |
7bd9bcf3 | 113 | |
32c597e7 | 114 | /* |
9e7ec634 NTND |
115 | * Die if refs is not the main ref store. caller is used in any |
116 | * necessary error messages. | |
32c597e7 MH |
117 | */ |
118 | static void files_assert_main_repository(struct files_ref_store *refs, | |
119 | const char *caller) | |
120 | { | |
9e7ec634 NTND |
121 | if (refs->store_flags & REF_STORE_MAIN) |
122 | return; | |
123 | ||
033abf97 | 124 | BUG("operation %s only allowed for main ref store", caller); |
32c597e7 MH |
125 | } |
126 | ||
a2d5156c | 127 | /* |
00eebe35 | 128 | * Downcast ref_store to files_ref_store. Die if ref_store is not a |
9e7ec634 NTND |
129 | * files_ref_store. required_flags is compared with ref_store's |
130 | * store_flags to ensure the ref_store has all required capabilities. | |
131 | * "caller" is used in any necessary error messages. | |
a2d5156c | 132 | */ |
9e7ec634 NTND |
133 | static struct files_ref_store *files_downcast(struct ref_store *ref_store, |
134 | unsigned int required_flags, | |
135 | const char *caller) | |
a2d5156c | 136 | { |
32c597e7 MH |
137 | struct files_ref_store *refs; |
138 | ||
00eebe35 | 139 | if (ref_store->be != &refs_be_files) |
033abf97 | 140 | BUG("ref_store is type \"%s\" not \"files\" in %s", |
00eebe35 | 141 | ref_store->be->name, caller); |
2eed2780 | 142 | |
32c597e7 MH |
143 | refs = (struct files_ref_store *)ref_store; |
144 | ||
9e7ec634 | 145 | if ((refs->store_flags & required_flags) != required_flags) |
033abf97 | 146 | BUG("operation %s requires abilities 0x%x, but only have 0x%x", |
9e7ec634 | 147 | caller, required_flags, refs->store_flags); |
2eed2780 | 148 | |
32c597e7 | 149 | return refs; |
7bd9bcf3 MH |
150 | } |
151 | ||
802de3da NTND |
152 | static void files_reflog_path(struct files_ref_store *refs, |
153 | struct strbuf *sb, | |
154 | const char *refname) | |
155 | { | |
f57f37e2 NTND |
156 | switch (ref_type(refname)) { |
157 | case REF_TYPE_PER_WORKTREE: | |
158 | case REF_TYPE_PSEUDOREF: | |
159 | strbuf_addf(sb, "%s/logs/%s", refs->gitdir, refname); | |
160 | break; | |
161 | case REF_TYPE_NORMAL: | |
162 | strbuf_addf(sb, "%s/logs/%s", refs->gitcommondir, refname); | |
163 | break; | |
164 | default: | |
033abf97 | 165 | BUG("unknown ref type %d of ref %s", |
f57f37e2 NTND |
166 | ref_type(refname), refname); |
167 | } | |
802de3da NTND |
168 | } |
169 | ||
19e02f4f NTND |
170 | static void files_ref_path(struct files_ref_store *refs, |
171 | struct strbuf *sb, | |
172 | const char *refname) | |
173 | { | |
f57f37e2 NTND |
174 | switch (ref_type(refname)) { |
175 | case REF_TYPE_PER_WORKTREE: | |
176 | case REF_TYPE_PSEUDOREF: | |
177 | strbuf_addf(sb, "%s/%s", refs->gitdir, refname); | |
178 | break; | |
179 | case REF_TYPE_NORMAL: | |
180 | strbuf_addf(sb, "%s/%s", refs->gitcommondir, refname); | |
181 | break; | |
182 | default: | |
033abf97 | 183 | BUG("unknown ref type %d of ref %s", |
f57f37e2 NTND |
184 | ref_type(refname), refname); |
185 | } | |
19e02f4f NTND |
186 | } |
187 | ||
7bd9bcf3 MH |
188 | /* |
189 | * Read the loose references from the namespace dirname into dir | |
190 | * (without recursing). dirname must end with '/'. dir must be the | |
191 | * directory entry corresponding to dirname. | |
192 | */ | |
df308759 MH |
193 | static void loose_fill_ref_dir(struct ref_store *ref_store, |
194 | struct ref_dir *dir, const char *dirname) | |
7bd9bcf3 | 195 | { |
df308759 MH |
196 | struct files_ref_store *refs = |
197 | files_downcast(ref_store, REF_STORE_READ, "fill_ref_dir"); | |
7bd9bcf3 MH |
198 | DIR *d; |
199 | struct dirent *de; | |
200 | int dirnamelen = strlen(dirname); | |
201 | struct strbuf refname; | |
202 | struct strbuf path = STRBUF_INIT; | |
203 | size_t path_baselen; | |
204 | ||
19e02f4f | 205 | files_ref_path(refs, &path, dirname); |
7bd9bcf3 MH |
206 | path_baselen = path.len; |
207 | ||
208 | d = opendir(path.buf); | |
209 | if (!d) { | |
210 | strbuf_release(&path); | |
211 | return; | |
212 | } | |
213 | ||
214 | strbuf_init(&refname, dirnamelen + 257); | |
215 | strbuf_add(&refname, dirname, dirnamelen); | |
216 | ||
217 | while ((de = readdir(d)) != NULL) { | |
4417df8c | 218 | struct object_id oid; |
7bd9bcf3 MH |
219 | struct stat st; |
220 | int flag; | |
221 | ||
222 | if (de->d_name[0] == '.') | |
223 | continue; | |
224 | if (ends_with(de->d_name, ".lock")) | |
225 | continue; | |
226 | strbuf_addstr(&refname, de->d_name); | |
227 | strbuf_addstr(&path, de->d_name); | |
228 | if (stat(path.buf, &st) < 0) { | |
229 | ; /* silently ignore */ | |
230 | } else if (S_ISDIR(st.st_mode)) { | |
231 | strbuf_addch(&refname, '/'); | |
232 | add_entry_to_dir(dir, | |
e00d1a4f | 233 | create_dir_entry(dir->cache, refname.buf, |
7bd9bcf3 MH |
234 | refname.len, 1)); |
235 | } else { | |
7d2df051 | 236 | if (!refs_resolve_ref_unsafe(&refs->base, |
3c0cb0cb MH |
237 | refname.buf, |
238 | RESOLVE_REF_READING, | |
49e61479 | 239 | &oid, &flag)) { |
4417df8c | 240 | oidclr(&oid); |
7bd9bcf3 | 241 | flag |= REF_ISBROKEN; |
4417df8c | 242 | } else if (is_null_oid(&oid)) { |
7bd9bcf3 MH |
243 | /* |
244 | * It is so astronomically unlikely | |
78fb4579 | 245 | * that null_oid is the OID of an |
7bd9bcf3 MH |
246 | * actual object that we consider its |
247 | * appearance in a loose reference | |
248 | * file to be repo corruption | |
249 | * (probably due to a software bug). | |
250 | */ | |
251 | flag |= REF_ISBROKEN; | |
252 | } | |
253 | ||
254 | if (check_refname_format(refname.buf, | |
255 | REFNAME_ALLOW_ONELEVEL)) { | |
256 | if (!refname_is_safe(refname.buf)) | |
257 | die("loose refname is dangerous: %s", refname.buf); | |
4417df8c | 258 | oidclr(&oid); |
7bd9bcf3 MH |
259 | flag |= REF_BAD_NAME | REF_ISBROKEN; |
260 | } | |
261 | add_entry_to_dir(dir, | |
c1da06c6 | 262 | create_ref_entry(refname.buf, &oid, flag)); |
7bd9bcf3 MH |
263 | } |
264 | strbuf_setlen(&refname, dirnamelen); | |
265 | strbuf_setlen(&path, path_baselen); | |
266 | } | |
267 | strbuf_release(&refname); | |
268 | strbuf_release(&path); | |
269 | closedir(d); | |
e3bf2989 MH |
270 | |
271 | /* | |
272 | * Manually add refs/bisect, which, being per-worktree, might | |
273 | * not appear in the directory listing for refs/ in the main | |
274 | * repo. | |
275 | */ | |
276 | if (!strcmp(dirname, "refs/")) { | |
277 | int pos = search_ref_dir(dir, "refs/bisect/", 12); | |
278 | ||
279 | if (pos < 0) { | |
280 | struct ref_entry *child_entry = create_dir_entry( | |
281 | dir->cache, "refs/bisect/", 12, 1); | |
282 | add_entry_to_dir(dir, child_entry); | |
283 | } | |
284 | } | |
7bd9bcf3 MH |
285 | } |
286 | ||
a714b19c | 287 | static struct ref_cache *get_loose_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 MH |
288 | { |
289 | if (!refs->loose) { | |
290 | /* | |
291 | * Mark the top-level directory complete because we | |
292 | * are about to read the only subdirectory that can | |
293 | * hold references: | |
294 | */ | |
df308759 | 295 | refs->loose = create_ref_cache(&refs->base, loose_fill_ref_dir); |
7c22bc8a MH |
296 | |
297 | /* We're going to fill the top level ourselves: */ | |
298 | refs->loose->root->flag &= ~REF_INCOMPLETE; | |
299 | ||
7bd9bcf3 | 300 | /* |
7c22bc8a MH |
301 | * Add an incomplete entry for "refs/" (to be filled |
302 | * lazily): | |
7bd9bcf3 | 303 | */ |
7c22bc8a | 304 | add_entry_to_dir(get_ref_dir(refs->loose->root), |
e00d1a4f | 305 | create_dir_entry(refs->loose, "refs/", 5, 1)); |
7bd9bcf3 | 306 | } |
a714b19c | 307 | return refs->loose; |
7bd9bcf3 MH |
308 | } |
309 | ||
e1e33b72 | 310 | static int files_read_raw_ref(struct ref_store *ref_store, |
99afe91a | 311 | const char *refname, struct object_id *oid, |
e1e33b72 | 312 | struct strbuf *referent, unsigned int *type) |
7bd9bcf3 | 313 | { |
4308651c | 314 | struct files_ref_store *refs = |
9e7ec634 | 315 | files_downcast(ref_store, REF_STORE_READ, "read_raw_ref"); |
42a38cf7 MH |
316 | struct strbuf sb_contents = STRBUF_INIT; |
317 | struct strbuf sb_path = STRBUF_INIT; | |
7048653a DT |
318 | const char *path; |
319 | const char *buf; | |
99afe91a | 320 | const char *p; |
7048653a DT |
321 | struct stat st; |
322 | int fd; | |
42a38cf7 MH |
323 | int ret = -1; |
324 | int save_errno; | |
e8c42cb9 | 325 | int remaining_retries = 3; |
7bd9bcf3 | 326 | |
fa96ea1b | 327 | *type = 0; |
42a38cf7 | 328 | strbuf_reset(&sb_path); |
34c7ad8f | 329 | |
19e02f4f | 330 | files_ref_path(refs, &sb_path, refname); |
34c7ad8f | 331 | |
42a38cf7 | 332 | path = sb_path.buf; |
7bd9bcf3 | 333 | |
7048653a DT |
334 | stat_ref: |
335 | /* | |
336 | * We might have to loop back here to avoid a race | |
337 | * condition: first we lstat() the file, then we try | |
338 | * to read it as a link or as a file. But if somebody | |
339 | * changes the type of the file (file <-> directory | |
340 | * <-> symlink) between the lstat() and reading, then | |
341 | * we don't want to report that as an error but rather | |
342 | * try again starting with the lstat(). | |
e8c42cb9 JK |
343 | * |
344 | * We'll keep a count of the retries, though, just to avoid | |
345 | * any confusing situation sending us into an infinite loop. | |
7048653a | 346 | */ |
7bd9bcf3 | 347 | |
e8c42cb9 JK |
348 | if (remaining_retries-- <= 0) |
349 | goto out; | |
350 | ||
7048653a DT |
351 | if (lstat(path, &st) < 0) { |
352 | if (errno != ENOENT) | |
42a38cf7 | 353 | goto out; |
e0cc8ac8 | 354 | if (refs_read_raw_ref(refs->packed_ref_store, refname, |
99afe91a | 355 | oid, referent, type)) { |
7048653a | 356 | errno = ENOENT; |
42a38cf7 | 357 | goto out; |
7bd9bcf3 | 358 | } |
42a38cf7 MH |
359 | ret = 0; |
360 | goto out; | |
7bd9bcf3 | 361 | } |
7bd9bcf3 | 362 | |
7048653a DT |
363 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
364 | if (S_ISLNK(st.st_mode)) { | |
42a38cf7 MH |
365 | strbuf_reset(&sb_contents); |
366 | if (strbuf_readlink(&sb_contents, path, 0) < 0) { | |
7048653a | 367 | if (errno == ENOENT || errno == EINVAL) |
7bd9bcf3 MH |
368 | /* inconsistent with lstat; retry */ |
369 | goto stat_ref; | |
370 | else | |
42a38cf7 | 371 | goto out; |
7bd9bcf3 | 372 | } |
42a38cf7 MH |
373 | if (starts_with(sb_contents.buf, "refs/") && |
374 | !check_refname_format(sb_contents.buf, 0)) { | |
92b38093 | 375 | strbuf_swap(&sb_contents, referent); |
3a0b6b9a | 376 | *type |= REF_ISSYMREF; |
42a38cf7 MH |
377 | ret = 0; |
378 | goto out; | |
7bd9bcf3 | 379 | } |
3f7bd767 JK |
380 | /* |
381 | * It doesn't look like a refname; fall through to just | |
382 | * treating it like a non-symlink, and reading whatever it | |
383 | * points to. | |
384 | */ | |
7048653a | 385 | } |
7bd9bcf3 | 386 | |
7048653a DT |
387 | /* Is it a directory? */ |
388 | if (S_ISDIR(st.st_mode)) { | |
e167a567 MH |
389 | /* |
390 | * Even though there is a directory where the loose | |
391 | * ref is supposed to be, there could still be a | |
392 | * packed ref: | |
393 | */ | |
e0cc8ac8 | 394 | if (refs_read_raw_ref(refs->packed_ref_store, refname, |
99afe91a | 395 | oid, referent, type)) { |
e167a567 MH |
396 | errno = EISDIR; |
397 | goto out; | |
398 | } | |
399 | ret = 0; | |
42a38cf7 | 400 | goto out; |
7048653a DT |
401 | } |
402 | ||
403 | /* | |
404 | * Anything else, just open it and try to use it as | |
405 | * a ref | |
406 | */ | |
407 | fd = open(path, O_RDONLY); | |
408 | if (fd < 0) { | |
3f7bd767 | 409 | if (errno == ENOENT && !S_ISLNK(st.st_mode)) |
7048653a DT |
410 | /* inconsistent with lstat; retry */ |
411 | goto stat_ref; | |
412 | else | |
42a38cf7 | 413 | goto out; |
7048653a | 414 | } |
42a38cf7 MH |
415 | strbuf_reset(&sb_contents); |
416 | if (strbuf_read(&sb_contents, fd, 256) < 0) { | |
7048653a DT |
417 | int save_errno = errno; |
418 | close(fd); | |
419 | errno = save_errno; | |
42a38cf7 | 420 | goto out; |
7048653a DT |
421 | } |
422 | close(fd); | |
42a38cf7 MH |
423 | strbuf_rtrim(&sb_contents); |
424 | buf = sb_contents.buf; | |
7048653a DT |
425 | if (starts_with(buf, "ref:")) { |
426 | buf += 4; | |
7bd9bcf3 MH |
427 | while (isspace(*buf)) |
428 | buf++; | |
7048653a | 429 | |
92b38093 MH |
430 | strbuf_reset(referent); |
431 | strbuf_addstr(referent, buf); | |
3a0b6b9a | 432 | *type |= REF_ISSYMREF; |
42a38cf7 MH |
433 | ret = 0; |
434 | goto out; | |
7bd9bcf3 | 435 | } |
7bd9bcf3 | 436 | |
7048653a DT |
437 | /* |
438 | * Please note that FETCH_HEAD has additional | |
439 | * data after the sha. | |
440 | */ | |
99afe91a | 441 | if (parse_oid_hex(buf, oid, &p) || |
442 | (*p != '\0' && !isspace(*p))) { | |
3a0b6b9a | 443 | *type |= REF_ISBROKEN; |
7048653a | 444 | errno = EINVAL; |
42a38cf7 | 445 | goto out; |
7048653a DT |
446 | } |
447 | ||
42a38cf7 | 448 | ret = 0; |
7bd9bcf3 | 449 | |
42a38cf7 MH |
450 | out: |
451 | save_errno = errno; | |
7bd9bcf3 MH |
452 | strbuf_release(&sb_path); |
453 | strbuf_release(&sb_contents); | |
42a38cf7 | 454 | errno = save_errno; |
7bd9bcf3 MH |
455 | return ret; |
456 | } | |
457 | ||
8415d247 MH |
458 | static void unlock_ref(struct ref_lock *lock) |
459 | { | |
ee4d8e45 | 460 | rollback_lock_file(&lock->lk); |
8415d247 | 461 | free(lock->ref_name); |
8415d247 MH |
462 | free(lock); |
463 | } | |
464 | ||
92b1551b MH |
465 | /* |
466 | * Lock refname, without following symrefs, and set *lock_p to point | |
467 | * at a newly-allocated lock object. Fill in lock->old_oid, referent, | |
468 | * and type similarly to read_raw_ref(). | |
469 | * | |
470 | * The caller must verify that refname is a "safe" reference name (in | |
471 | * the sense of refname_is_safe()) before calling this function. | |
472 | * | |
473 | * If the reference doesn't already exist, verify that refname doesn't | |
474 | * have a D/F conflict with any existing references. extras and skip | |
524a9fdb | 475 | * are passed to refs_verify_refname_available() for this check. |
92b1551b MH |
476 | * |
477 | * If mustexist is not set and the reference is not found or is | |
78fb4579 | 478 | * broken, lock the reference anyway but clear old_oid. |
92b1551b MH |
479 | * |
480 | * Return 0 on success. On failure, write an error message to err and | |
481 | * return TRANSACTION_NAME_CONFLICT or TRANSACTION_GENERIC_ERROR. | |
482 | * | |
483 | * Implementation note: This function is basically | |
484 | * | |
485 | * lock reference | |
486 | * read_raw_ref() | |
487 | * | |
488 | * but it includes a lot more code to | |
489 | * - Deal with possible races with other processes | |
524a9fdb | 490 | * - Avoid calling refs_verify_refname_available() when it can be |
92b1551b MH |
491 | * avoided, namely if we were successfully able to read the ref |
492 | * - Generate informative error messages in the case of failure | |
493 | */ | |
f7b0a987 MH |
494 | static int lock_raw_ref(struct files_ref_store *refs, |
495 | const char *refname, int mustexist, | |
92b1551b MH |
496 | const struct string_list *extras, |
497 | const struct string_list *skip, | |
498 | struct ref_lock **lock_p, | |
499 | struct strbuf *referent, | |
500 | unsigned int *type, | |
501 | struct strbuf *err) | |
502 | { | |
503 | struct ref_lock *lock; | |
504 | struct strbuf ref_file = STRBUF_INIT; | |
505 | int attempts_remaining = 3; | |
506 | int ret = TRANSACTION_GENERIC_ERROR; | |
507 | ||
508 | assert(err); | |
32c597e7 | 509 | files_assert_main_repository(refs, "lock_raw_ref"); |
f7b0a987 | 510 | |
92b1551b MH |
511 | *type = 0; |
512 | ||
513 | /* First lock the file so it can't change out from under us. */ | |
514 | ||
515 | *lock_p = lock = xcalloc(1, sizeof(*lock)); | |
516 | ||
517 | lock->ref_name = xstrdup(refname); | |
19e02f4f | 518 | files_ref_path(refs, &ref_file, refname); |
92b1551b MH |
519 | |
520 | retry: | |
521 | switch (safe_create_leading_directories(ref_file.buf)) { | |
522 | case SCLD_OK: | |
523 | break; /* success */ | |
524 | case SCLD_EXISTS: | |
525 | /* | |
526 | * Suppose refname is "refs/foo/bar". We just failed | |
527 | * to create the containing directory, "refs/foo", | |
528 | * because there was a non-directory in the way. This | |
529 | * indicates a D/F conflict, probably because of | |
530 | * another reference such as "refs/foo". There is no | |
531 | * reason to expect this error to be transitory. | |
532 | */ | |
7d2df051 NTND |
533 | if (refs_verify_refname_available(&refs->base, refname, |
534 | extras, skip, err)) { | |
92b1551b MH |
535 | if (mustexist) { |
536 | /* | |
537 | * To the user the relevant error is | |
538 | * that the "mustexist" reference is | |
539 | * missing: | |
540 | */ | |
541 | strbuf_reset(err); | |
542 | strbuf_addf(err, "unable to resolve reference '%s'", | |
543 | refname); | |
544 | } else { | |
545 | /* | |
546 | * The error message set by | |
524a9fdb MH |
547 | * refs_verify_refname_available() is |
548 | * OK. | |
92b1551b MH |
549 | */ |
550 | ret = TRANSACTION_NAME_CONFLICT; | |
551 | } | |
552 | } else { | |
553 | /* | |
554 | * The file that is in the way isn't a loose | |
555 | * reference. Report it as a low-level | |
556 | * failure. | |
557 | */ | |
558 | strbuf_addf(err, "unable to create lock file %s.lock; " | |
559 | "non-directory in the way", | |
560 | ref_file.buf); | |
561 | } | |
562 | goto error_return; | |
563 | case SCLD_VANISHED: | |
564 | /* Maybe another process was tidying up. Try again. */ | |
565 | if (--attempts_remaining > 0) | |
566 | goto retry; | |
567 | /* fall through */ | |
568 | default: | |
569 | strbuf_addf(err, "unable to create directory for %s", | |
570 | ref_file.buf); | |
571 | goto error_return; | |
572 | } | |
573 | ||
4ff0f01c | 574 | if (hold_lock_file_for_update_timeout( |
ee4d8e45 | 575 | &lock->lk, ref_file.buf, LOCK_NO_DEREF, |
4ff0f01c | 576 | get_files_ref_lock_timeout_ms()) < 0) { |
92b1551b MH |
577 | if (errno == ENOENT && --attempts_remaining > 0) { |
578 | /* | |
579 | * Maybe somebody just deleted one of the | |
580 | * directories leading to ref_file. Try | |
581 | * again: | |
582 | */ | |
583 | goto retry; | |
584 | } else { | |
585 | unable_to_lock_message(ref_file.buf, errno, err); | |
586 | goto error_return; | |
587 | } | |
588 | } | |
589 | ||
590 | /* | |
591 | * Now we hold the lock and can read the reference without | |
592 | * fear that its value will change. | |
593 | */ | |
594 | ||
f7b0a987 | 595 | if (files_read_raw_ref(&refs->base, refname, |
99afe91a | 596 | &lock->old_oid, referent, type)) { |
92b1551b MH |
597 | if (errno == ENOENT) { |
598 | if (mustexist) { | |
599 | /* Garden variety missing reference. */ | |
600 | strbuf_addf(err, "unable to resolve reference '%s'", | |
601 | refname); | |
602 | goto error_return; | |
603 | } else { | |
604 | /* | |
605 | * Reference is missing, but that's OK. We | |
606 | * know that there is not a conflict with | |
607 | * another loose reference because | |
608 | * (supposing that we are trying to lock | |
609 | * reference "refs/foo/bar"): | |
610 | * | |
611 | * - We were successfully able to create | |
612 | * the lockfile refs/foo/bar.lock, so we | |
613 | * know there cannot be a loose reference | |
614 | * named "refs/foo". | |
615 | * | |
616 | * - We got ENOENT and not EISDIR, so we | |
617 | * know that there cannot be a loose | |
618 | * reference named "refs/foo/bar/baz". | |
619 | */ | |
620 | } | |
621 | } else if (errno == EISDIR) { | |
622 | /* | |
623 | * There is a directory in the way. It might have | |
624 | * contained references that have been deleted. If | |
625 | * we don't require that the reference already | |
626 | * exists, try to remove the directory so that it | |
627 | * doesn't cause trouble when we want to rename the | |
628 | * lockfile into place later. | |
629 | */ | |
630 | if (mustexist) { | |
631 | /* Garden variety missing reference. */ | |
632 | strbuf_addf(err, "unable to resolve reference '%s'", | |
633 | refname); | |
634 | goto error_return; | |
635 | } else if (remove_dir_recursively(&ref_file, | |
636 | REMOVE_DIR_EMPTY_ONLY)) { | |
b05855b5 MH |
637 | if (refs_verify_refname_available( |
638 | &refs->base, refname, | |
639 | extras, skip, err)) { | |
92b1551b MH |
640 | /* |
641 | * The error message set by | |
642 | * verify_refname_available() is OK. | |
643 | */ | |
644 | ret = TRANSACTION_NAME_CONFLICT; | |
645 | goto error_return; | |
646 | } else { | |
647 | /* | |
648 | * We can't delete the directory, | |
649 | * but we also don't know of any | |
650 | * references that it should | |
651 | * contain. | |
652 | */ | |
653 | strbuf_addf(err, "there is a non-empty directory '%s' " | |
654 | "blocking reference '%s'", | |
655 | ref_file.buf, refname); | |
656 | goto error_return; | |
657 | } | |
658 | } | |
659 | } else if (errno == EINVAL && (*type & REF_ISBROKEN)) { | |
660 | strbuf_addf(err, "unable to resolve reference '%s': " | |
661 | "reference broken", refname); | |
662 | goto error_return; | |
663 | } else { | |
664 | strbuf_addf(err, "unable to resolve reference '%s': %s", | |
665 | refname, strerror(errno)); | |
666 | goto error_return; | |
667 | } | |
668 | ||
669 | /* | |
670 | * If the ref did not exist and we are creating it, | |
8ec617c8 MH |
671 | * make sure there is no existing packed ref that |
672 | * conflicts with refname: | |
92b1551b | 673 | */ |
524a9fdb | 674 | if (refs_verify_refname_available( |
8ec617c8 | 675 | refs->packed_ref_store, refname, |
524a9fdb | 676 | extras, skip, err)) |
92b1551b | 677 | goto error_return; |
92b1551b MH |
678 | } |
679 | ||
680 | ret = 0; | |
681 | goto out; | |
682 | ||
683 | error_return: | |
684 | unlock_ref(lock); | |
685 | *lock_p = NULL; | |
686 | ||
687 | out: | |
688 | strbuf_release(&ref_file); | |
689 | return ret; | |
690 | } | |
691 | ||
3bc581b9 MH |
692 | struct files_ref_iterator { |
693 | struct ref_iterator base; | |
694 | ||
3bc581b9 MH |
695 | struct ref_iterator *iter0; |
696 | unsigned int flags; | |
697 | }; | |
7bd9bcf3 | 698 | |
3bc581b9 MH |
699 | static int files_ref_iterator_advance(struct ref_iterator *ref_iterator) |
700 | { | |
701 | struct files_ref_iterator *iter = | |
702 | (struct files_ref_iterator *)ref_iterator; | |
703 | int ok; | |
7bd9bcf3 | 704 | |
3bc581b9 | 705 | while ((ok = ref_iterator_advance(iter->iter0)) == ITER_OK) { |
0c09ec07 DT |
706 | if (iter->flags & DO_FOR_EACH_PER_WORKTREE_ONLY && |
707 | ref_type(iter->iter0->refname) != REF_TYPE_PER_WORKTREE) | |
708 | continue; | |
709 | ||
3bc581b9 MH |
710 | if (!(iter->flags & DO_FOR_EACH_INCLUDE_BROKEN) && |
711 | !ref_resolves_to_object(iter->iter0->refname, | |
712 | iter->iter0->oid, | |
713 | iter->iter0->flags)) | |
714 | continue; | |
715 | ||
716 | iter->base.refname = iter->iter0->refname; | |
717 | iter->base.oid = iter->iter0->oid; | |
718 | iter->base.flags = iter->iter0->flags; | |
719 | return ITER_OK; | |
7bd9bcf3 MH |
720 | } |
721 | ||
3bc581b9 MH |
722 | iter->iter0 = NULL; |
723 | if (ref_iterator_abort(ref_iterator) != ITER_DONE) | |
724 | ok = ITER_ERROR; | |
725 | ||
726 | return ok; | |
7bd9bcf3 MH |
727 | } |
728 | ||
3bc581b9 MH |
729 | static int files_ref_iterator_peel(struct ref_iterator *ref_iterator, |
730 | struct object_id *peeled) | |
7bd9bcf3 | 731 | { |
3bc581b9 MH |
732 | struct files_ref_iterator *iter = |
733 | (struct files_ref_iterator *)ref_iterator; | |
93770590 | 734 | |
3bc581b9 MH |
735 | return ref_iterator_peel(iter->iter0, peeled); |
736 | } | |
737 | ||
738 | static int files_ref_iterator_abort(struct ref_iterator *ref_iterator) | |
739 | { | |
740 | struct files_ref_iterator *iter = | |
741 | (struct files_ref_iterator *)ref_iterator; | |
742 | int ok = ITER_DONE; | |
743 | ||
744 | if (iter->iter0) | |
745 | ok = ref_iterator_abort(iter->iter0); | |
746 | ||
3bc581b9 MH |
747 | base_ref_iterator_free(ref_iterator); |
748 | return ok; | |
749 | } | |
750 | ||
751 | static struct ref_iterator_vtable files_ref_iterator_vtable = { | |
752 | files_ref_iterator_advance, | |
753 | files_ref_iterator_peel, | |
754 | files_ref_iterator_abort | |
755 | }; | |
756 | ||
1a769003 | 757 | static struct ref_iterator *files_ref_iterator_begin( |
37b6f6d5 | 758 | struct ref_store *ref_store, |
3bc581b9 MH |
759 | const char *prefix, unsigned int flags) |
760 | { | |
9e7ec634 | 761 | struct files_ref_store *refs; |
8738a8a4 | 762 | struct ref_iterator *loose_iter, *packed_iter, *overlay_iter; |
3bc581b9 MH |
763 | struct files_ref_iterator *iter; |
764 | struct ref_iterator *ref_iterator; | |
0a0865b8 | 765 | unsigned int required_flags = REF_STORE_READ; |
3bc581b9 | 766 | |
0a0865b8 MH |
767 | if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) |
768 | required_flags |= REF_STORE_ODB; | |
3bc581b9 | 769 | |
0a0865b8 | 770 | refs = files_downcast(ref_store, required_flags, "ref_iterator_begin"); |
9e7ec634 | 771 | |
3bc581b9 MH |
772 | /* |
773 | * We must make sure that all loose refs are read before | |
774 | * accessing the packed-refs file; this avoids a race | |
775 | * condition if loose refs are migrated to the packed-refs | |
776 | * file by a simultaneous process, but our in-memory view is | |
777 | * from before the migration. We ensure this as follows: | |
059ae35a MH |
778 | * First, we call start the loose refs iteration with its |
779 | * `prime_ref` argument set to true. This causes the loose | |
780 | * references in the subtree to be pre-read into the cache. | |
781 | * (If they've already been read, that's OK; we only need to | |
782 | * guarantee that they're read before the packed refs, not | |
783 | * *how much* before.) After that, we call | |
38b86e81 MH |
784 | * packed_ref_iterator_begin(), which internally checks |
785 | * whether the packed-ref cache is up to date with what is on | |
786 | * disk, and re-reads it if not. | |
3bc581b9 MH |
787 | */ |
788 | ||
059ae35a MH |
789 | loose_iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), |
790 | prefix, 1); | |
3bc581b9 | 791 | |
38b86e81 MH |
792 | /* |
793 | * The packed-refs file might contain broken references, for | |
794 | * example an old version of a reference that points at an | |
795 | * object that has since been garbage-collected. This is OK as | |
796 | * long as there is a corresponding loose reference that | |
797 | * overrides it, and we don't want to emit an error message in | |
798 | * this case. So ask the packed_ref_store for all of its | |
799 | * references, and (if needed) do our own check for broken | |
800 | * ones in files_ref_iterator_advance(), after we have merged | |
801 | * the packed and loose references. | |
802 | */ | |
e0cc8ac8 MH |
803 | packed_iter = refs_ref_iterator_begin( |
804 | refs->packed_ref_store, prefix, 0, | |
38b86e81 | 805 | DO_FOR_EACH_INCLUDE_BROKEN); |
3bc581b9 | 806 | |
8738a8a4 MH |
807 | overlay_iter = overlay_ref_iterator_begin(loose_iter, packed_iter); |
808 | ||
809 | iter = xcalloc(1, sizeof(*iter)); | |
810 | ref_iterator = &iter->base; | |
811 | base_ref_iterator_init(ref_iterator, &files_ref_iterator_vtable, | |
812 | overlay_iter->ordered); | |
813 | iter->iter0 = overlay_iter; | |
3bc581b9 MH |
814 | iter->flags = flags; |
815 | ||
816 | return ref_iterator; | |
7bd9bcf3 MH |
817 | } |
818 | ||
7bd9bcf3 | 819 | /* |
4f01e508 | 820 | * Verify that the reference locked by lock has the value old_oid |
821 | * (unless it is NULL). Fail if the reference doesn't exist and | |
822 | * mustexist is set. Return 0 on success. On error, write an error | |
823 | * message to err, set errno, and return a negative value. | |
7bd9bcf3 | 824 | */ |
2f40e954 | 825 | static int verify_lock(struct ref_store *ref_store, struct ref_lock *lock, |
4f01e508 | 826 | const struct object_id *old_oid, int mustexist, |
7bd9bcf3 MH |
827 | struct strbuf *err) |
828 | { | |
829 | assert(err); | |
830 | ||
2f40e954 NTND |
831 | if (refs_read_ref_full(ref_store, lock->ref_name, |
832 | mustexist ? RESOLVE_REF_READING : 0, | |
34c290a6 | 833 | &lock->old_oid, NULL)) { |
4f01e508 | 834 | if (old_oid) { |
6294dcb4 | 835 | int save_errno = errno; |
0568c8e9 | 836 | strbuf_addf(err, "can't verify ref '%s'", lock->ref_name); |
6294dcb4 JK |
837 | errno = save_errno; |
838 | return -1; | |
839 | } else { | |
c368dde9 | 840 | oidclr(&lock->old_oid); |
6294dcb4 JK |
841 | return 0; |
842 | } | |
7bd9bcf3 | 843 | } |
4f01e508 | 844 | if (old_oid && oidcmp(&lock->old_oid, old_oid)) { |
0568c8e9 | 845 | strbuf_addf(err, "ref '%s' is at %s but expected %s", |
7bd9bcf3 | 846 | lock->ref_name, |
c368dde9 | 847 | oid_to_hex(&lock->old_oid), |
4f01e508 | 848 | oid_to_hex(old_oid)); |
7bd9bcf3 MH |
849 | errno = EBUSY; |
850 | return -1; | |
851 | } | |
852 | return 0; | |
853 | } | |
854 | ||
855 | static int remove_empty_directories(struct strbuf *path) | |
856 | { | |
857 | /* | |
858 | * we want to create a file but there is a directory there; | |
859 | * if that is an empty directory (or a directory that contains | |
860 | * only empty directories), remove them. | |
861 | */ | |
862 | return remove_dir_recursively(path, REMOVE_DIR_EMPTY_ONLY); | |
863 | } | |
864 | ||
3b5d3c98 MH |
865 | static int create_reflock(const char *path, void *cb) |
866 | { | |
867 | struct lock_file *lk = cb; | |
868 | ||
4ff0f01c MH |
869 | return hold_lock_file_for_update_timeout( |
870 | lk, path, LOCK_NO_DEREF, | |
871 | get_files_ref_lock_timeout_ms()) < 0 ? -1 : 0; | |
3b5d3c98 MH |
872 | } |
873 | ||
7bd9bcf3 MH |
874 | /* |
875 | * Locks a ref returning the lock on success and NULL on failure. | |
876 | * On failure errno is set to something meaningful. | |
877 | */ | |
4f01e508 | 878 | static struct ref_lock *lock_ref_oid_basic(struct files_ref_store *refs, |
879 | const char *refname, | |
880 | const struct object_id *old_oid, | |
881 | const struct string_list *extras, | |
882 | const struct string_list *skip, | |
883 | unsigned int flags, int *type, | |
884 | struct strbuf *err) | |
7bd9bcf3 MH |
885 | { |
886 | struct strbuf ref_file = STRBUF_INIT; | |
7bd9bcf3 MH |
887 | struct ref_lock *lock; |
888 | int last_errno = 0; | |
4f01e508 | 889 | int mustexist = (old_oid && !is_null_oid(old_oid)); |
7a418f3a | 890 | int resolve_flags = RESOLVE_REF_NO_RECURSE; |
7a418f3a | 891 | int resolved; |
7bd9bcf3 | 892 | |
4f01e508 | 893 | files_assert_main_repository(refs, "lock_ref_oid_basic"); |
7bd9bcf3 MH |
894 | assert(err); |
895 | ||
896 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
897 | ||
898 | if (mustexist) | |
899 | resolve_flags |= RESOLVE_REF_READING; | |
2859dcd4 | 900 | if (flags & REF_DELETING) |
7bd9bcf3 | 901 | resolve_flags |= RESOLVE_REF_ALLOW_BAD_NAME; |
7bd9bcf3 | 902 | |
19e02f4f | 903 | files_ref_path(refs, &ref_file, refname); |
2f40e954 NTND |
904 | resolved = !!refs_resolve_ref_unsafe(&refs->base, |
905 | refname, resolve_flags, | |
49e61479 | 906 | &lock->old_oid, type); |
7a418f3a | 907 | if (!resolved && errno == EISDIR) { |
7bd9bcf3 MH |
908 | /* |
909 | * we are trying to lock foo but we used to | |
910 | * have foo/bar which now does not exist; | |
911 | * it is normal for the empty directory 'foo' | |
912 | * to remain. | |
913 | */ | |
7a418f3a | 914 | if (remove_empty_directories(&ref_file)) { |
7bd9bcf3 | 915 | last_errno = errno; |
b05855b5 MH |
916 | if (!refs_verify_refname_available( |
917 | &refs->base, | |
918 | refname, extras, skip, err)) | |
7bd9bcf3 | 919 | strbuf_addf(err, "there are still refs under '%s'", |
7a418f3a | 920 | refname); |
7bd9bcf3 MH |
921 | goto error_return; |
922 | } | |
2f40e954 NTND |
923 | resolved = !!refs_resolve_ref_unsafe(&refs->base, |
924 | refname, resolve_flags, | |
49e61479 | 925 | &lock->old_oid, type); |
7bd9bcf3 | 926 | } |
7a418f3a | 927 | if (!resolved) { |
7bd9bcf3 MH |
928 | last_errno = errno; |
929 | if (last_errno != ENOTDIR || | |
b05855b5 MH |
930 | !refs_verify_refname_available(&refs->base, refname, |
931 | extras, skip, err)) | |
0568c8e9 | 932 | strbuf_addf(err, "unable to resolve reference '%s': %s", |
7a418f3a | 933 | refname, strerror(last_errno)); |
7bd9bcf3 MH |
934 | |
935 | goto error_return; | |
936 | } | |
2859dcd4 | 937 | |
7bd9bcf3 MH |
938 | /* |
939 | * If the ref did not exist and we are creating it, make sure | |
940 | * there is no existing packed ref whose name begins with our | |
941 | * refname, nor a packed ref whose name is a proper prefix of | |
942 | * our refname. | |
943 | */ | |
944 | if (is_null_oid(&lock->old_oid) && | |
8ec617c8 | 945 | refs_verify_refname_available(refs->packed_ref_store, refname, |
524a9fdb | 946 | extras, skip, err)) { |
7bd9bcf3 MH |
947 | last_errno = ENOTDIR; |
948 | goto error_return; | |
949 | } | |
950 | ||
7bd9bcf3 | 951 | lock->ref_name = xstrdup(refname); |
7bd9bcf3 | 952 | |
ee4d8e45 | 953 | if (raceproof_create_file(ref_file.buf, create_reflock, &lock->lk)) { |
7bd9bcf3 | 954 | last_errno = errno; |
3b5d3c98 | 955 | unable_to_lock_message(ref_file.buf, errno, err); |
7bd9bcf3 MH |
956 | goto error_return; |
957 | } | |
958 | ||
4f01e508 | 959 | if (verify_lock(&refs->base, lock, old_oid, mustexist, err)) { |
7bd9bcf3 MH |
960 | last_errno = errno; |
961 | goto error_return; | |
962 | } | |
963 | goto out; | |
964 | ||
965 | error_return: | |
966 | unlock_ref(lock); | |
967 | lock = NULL; | |
968 | ||
969 | out: | |
970 | strbuf_release(&ref_file); | |
7bd9bcf3 MH |
971 | errno = last_errno; |
972 | return lock; | |
973 | } | |
974 | ||
7bd9bcf3 MH |
975 | struct ref_to_prune { |
976 | struct ref_to_prune *next; | |
49e99588 | 977 | struct object_id oid; |
7bd9bcf3 MH |
978 | char name[FLEX_ARRAY]; |
979 | }; | |
980 | ||
a8f0db2d MH |
981 | enum { |
982 | REMOVE_EMPTY_PARENTS_REF = 0x01, | |
983 | REMOVE_EMPTY_PARENTS_REFLOG = 0x02 | |
984 | }; | |
985 | ||
7bd9bcf3 | 986 | /* |
a8f0db2d MH |
987 | * Remove empty parent directories associated with the specified |
988 | * reference and/or its reflog, but spare [logs/]refs/ and immediate | |
989 | * subdirs. flags is a combination of REMOVE_EMPTY_PARENTS_REF and/or | |
990 | * REMOVE_EMPTY_PARENTS_REFLOG. | |
7bd9bcf3 | 991 | */ |
802de3da NTND |
992 | static void try_remove_empty_parents(struct files_ref_store *refs, |
993 | const char *refname, | |
994 | unsigned int flags) | |
7bd9bcf3 | 995 | { |
8bdaecb4 | 996 | struct strbuf buf = STRBUF_INIT; |
e9dcc305 | 997 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 MH |
998 | char *p, *q; |
999 | int i; | |
8bdaecb4 MH |
1000 | |
1001 | strbuf_addstr(&buf, refname); | |
1002 | p = buf.buf; | |
7bd9bcf3 MH |
1003 | for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */ |
1004 | while (*p && *p != '/') | |
1005 | p++; | |
1006 | /* tolerate duplicate slashes; see check_refname_format() */ | |
1007 | while (*p == '/') | |
1008 | p++; | |
1009 | } | |
8bdaecb4 | 1010 | q = buf.buf + buf.len; |
a8f0db2d | 1011 | while (flags & (REMOVE_EMPTY_PARENTS_REF | REMOVE_EMPTY_PARENTS_REFLOG)) { |
7bd9bcf3 MH |
1012 | while (q > p && *q != '/') |
1013 | q--; | |
1014 | while (q > p && *(q-1) == '/') | |
1015 | q--; | |
1016 | if (q == p) | |
1017 | break; | |
8bdaecb4 | 1018 | strbuf_setlen(&buf, q - buf.buf); |
e9dcc305 NTND |
1019 | |
1020 | strbuf_reset(&sb); | |
19e02f4f | 1021 | files_ref_path(refs, &sb, buf.buf); |
e9dcc305 | 1022 | if ((flags & REMOVE_EMPTY_PARENTS_REF) && rmdir(sb.buf)) |
a8f0db2d | 1023 | flags &= ~REMOVE_EMPTY_PARENTS_REF; |
e9dcc305 NTND |
1024 | |
1025 | strbuf_reset(&sb); | |
802de3da | 1026 | files_reflog_path(refs, &sb, buf.buf); |
e9dcc305 | 1027 | if ((flags & REMOVE_EMPTY_PARENTS_REFLOG) && rmdir(sb.buf)) |
a8f0db2d | 1028 | flags &= ~REMOVE_EMPTY_PARENTS_REFLOG; |
7bd9bcf3 | 1029 | } |
8bdaecb4 | 1030 | strbuf_release(&buf); |
e9dcc305 | 1031 | strbuf_release(&sb); |
7bd9bcf3 MH |
1032 | } |
1033 | ||
1034 | /* make sure nobody touched the ref, and unlink */ | |
2f40e954 | 1035 | static void prune_ref(struct files_ref_store *refs, struct ref_to_prune *r) |
7bd9bcf3 MH |
1036 | { |
1037 | struct ref_transaction *transaction; | |
1038 | struct strbuf err = STRBUF_INIT; | |
b00f3cfa | 1039 | int ret = -1; |
7bd9bcf3 MH |
1040 | |
1041 | if (check_refname_format(r->name, 0)) | |
1042 | return; | |
1043 | ||
2f40e954 | 1044 | transaction = ref_store_transaction_begin(&refs->base, &err); |
b00f3cfa MH |
1045 | if (!transaction) |
1046 | goto cleanup; | |
1047 | ref_transaction_add_update( | |
1048 | transaction, r->name, | |
acedcde7 | 1049 | REF_NO_DEREF | REF_HAVE_NEW | REF_HAVE_OLD | REF_IS_PRUNING, |
b00f3cfa MH |
1050 | &null_oid, &r->oid, NULL); |
1051 | if (ref_transaction_commit(transaction, &err)) | |
1052 | goto cleanup; | |
1053 | ||
1054 | ret = 0; | |
1055 | ||
1056 | cleanup: | |
1057 | if (ret) | |
7bd9bcf3 | 1058 | error("%s", err.buf); |
7bd9bcf3 | 1059 | strbuf_release(&err); |
b00f3cfa MH |
1060 | ref_transaction_free(transaction); |
1061 | return; | |
7bd9bcf3 MH |
1062 | } |
1063 | ||
22b09cdf MH |
1064 | /* |
1065 | * Prune the loose versions of the references in the linked list | |
1066 | * `*refs_to_prune`, freeing the entries in the list as we go. | |
1067 | */ | |
1068 | static void prune_refs(struct files_ref_store *refs, struct ref_to_prune **refs_to_prune) | |
7bd9bcf3 | 1069 | { |
22b09cdf MH |
1070 | while (*refs_to_prune) { |
1071 | struct ref_to_prune *r = *refs_to_prune; | |
1072 | *refs_to_prune = r->next; | |
2f40e954 | 1073 | prune_ref(refs, r); |
22b09cdf | 1074 | free(r); |
7bd9bcf3 MH |
1075 | } |
1076 | } | |
1077 | ||
531cc4a5 MH |
1078 | /* |
1079 | * Return true if the specified reference should be packed. | |
1080 | */ | |
1081 | static int should_pack_ref(const char *refname, | |
1082 | const struct object_id *oid, unsigned int ref_flags, | |
1083 | unsigned int pack_flags) | |
1084 | { | |
1085 | /* Do not pack per-worktree refs: */ | |
1086 | if (ref_type(refname) != REF_TYPE_NORMAL) | |
1087 | return 0; | |
1088 | ||
1089 | /* Do not pack non-tags unless PACK_REFS_ALL is set: */ | |
1090 | if (!(pack_flags & PACK_REFS_ALL) && !starts_with(refname, "refs/tags/")) | |
1091 | return 0; | |
1092 | ||
1093 | /* Do not pack symbolic refs: */ | |
1094 | if (ref_flags & REF_ISSYMREF) | |
1095 | return 0; | |
1096 | ||
1097 | /* Do not pack broken refs: */ | |
1098 | if (!ref_resolves_to_object(refname, oid, ref_flags)) | |
1099 | return 0; | |
1100 | ||
1101 | return 1; | |
1102 | } | |
1103 | ||
8231527e | 1104 | static int files_pack_refs(struct ref_store *ref_store, unsigned int flags) |
7bd9bcf3 | 1105 | { |
00eebe35 | 1106 | struct files_ref_store *refs = |
9e7ec634 NTND |
1107 | files_downcast(ref_store, REF_STORE_WRITE | REF_STORE_ODB, |
1108 | "pack_refs"); | |
50c2d855 | 1109 | struct ref_iterator *iter; |
50c2d855 MH |
1110 | int ok; |
1111 | struct ref_to_prune *refs_to_prune = NULL; | |
3478983b | 1112 | struct strbuf err = STRBUF_INIT; |
27d03d04 MH |
1113 | struct ref_transaction *transaction; |
1114 | ||
1115 | transaction = ref_store_transaction_begin(refs->packed_ref_store, &err); | |
1116 | if (!transaction) | |
1117 | return -1; | |
7bd9bcf3 | 1118 | |
c8bed835 | 1119 | packed_refs_lock(refs->packed_ref_store, LOCK_DIE_ON_ERROR, &err); |
50c2d855 MH |
1120 | |
1121 | iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), NULL, 0); | |
1122 | while ((ok = ref_iterator_advance(iter)) == ITER_OK) { | |
1123 | /* | |
1124 | * If the loose reference can be packed, add an entry | |
1125 | * in the packed ref cache. If the reference should be | |
1126 | * pruned, also add it to refs_to_prune. | |
1127 | */ | |
531cc4a5 MH |
1128 | if (!should_pack_ref(iter->refname, iter->oid, iter->flags, |
1129 | flags)) | |
50c2d855 MH |
1130 | continue; |
1131 | ||
1132 | /* | |
27d03d04 MH |
1133 | * Add a reference creation for this reference to the |
1134 | * packed-refs transaction: | |
50c2d855 | 1135 | */ |
27d03d04 | 1136 | if (ref_transaction_update(transaction, iter->refname, |
89f3bbdd | 1137 | iter->oid, NULL, |
91774afc | 1138 | REF_NO_DEREF, NULL, &err)) |
27d03d04 MH |
1139 | die("failure preparing to create packed reference %s: %s", |
1140 | iter->refname, err.buf); | |
50c2d855 MH |
1141 | |
1142 | /* Schedule the loose reference for pruning if requested. */ | |
1143 | if ((flags & PACK_REFS_PRUNE)) { | |
1144 | struct ref_to_prune *n; | |
1145 | FLEX_ALLOC_STR(n, name, iter->refname); | |
49e99588 | 1146 | oidcpy(&n->oid, iter->oid); |
50c2d855 MH |
1147 | n->next = refs_to_prune; |
1148 | refs_to_prune = n; | |
1149 | } | |
1150 | } | |
1151 | if (ok != ITER_DONE) | |
1152 | die("error while iterating over references"); | |
7bd9bcf3 | 1153 | |
27d03d04 MH |
1154 | if (ref_transaction_commit(transaction, &err)) |
1155 | die("unable to write new packed-refs: %s", err.buf); | |
1156 | ||
1157 | ref_transaction_free(transaction); | |
1158 | ||
42c7f7ff | 1159 | packed_refs_unlock(refs->packed_ref_store); |
7bd9bcf3 | 1160 | |
22b09cdf | 1161 | prune_refs(refs, &refs_to_prune); |
3478983b | 1162 | strbuf_release(&err); |
7bd9bcf3 MH |
1163 | return 0; |
1164 | } | |
1165 | ||
64da4199 | 1166 | static int files_delete_refs(struct ref_store *ref_store, const char *msg, |
a27dcf89 | 1167 | struct string_list *refnames, unsigned int flags) |
7bd9bcf3 | 1168 | { |
0a95ac5f | 1169 | struct files_ref_store *refs = |
9e7ec634 | 1170 | files_downcast(ref_store, REF_STORE_WRITE, "delete_refs"); |
7bd9bcf3 MH |
1171 | struct strbuf err = STRBUF_INIT; |
1172 | int i, result = 0; | |
1173 | ||
1174 | if (!refnames->nr) | |
1175 | return 0; | |
1176 | ||
e5cc7d7d MH |
1177 | if (packed_refs_lock(refs->packed_ref_store, 0, &err)) |
1178 | goto error; | |
7bd9bcf3 | 1179 | |
2fb330ca | 1180 | if (refs_delete_refs(refs->packed_ref_store, msg, refnames, flags)) { |
e5cc7d7d MH |
1181 | packed_refs_unlock(refs->packed_ref_store); |
1182 | goto error; | |
7bd9bcf3 MH |
1183 | } |
1184 | ||
e5cc7d7d MH |
1185 | packed_refs_unlock(refs->packed_ref_store); |
1186 | ||
7bd9bcf3 MH |
1187 | for (i = 0; i < refnames->nr; i++) { |
1188 | const char *refname = refnames->items[i].string; | |
1189 | ||
64da4199 | 1190 | if (refs_delete_ref(&refs->base, msg, refname, NULL, flags)) |
7bd9bcf3 MH |
1191 | result |= error(_("could not remove reference %s"), refname); |
1192 | } | |
1193 | ||
7bd9bcf3 MH |
1194 | strbuf_release(&err); |
1195 | return result; | |
e5cc7d7d MH |
1196 | |
1197 | error: | |
1198 | /* | |
1199 | * If we failed to rewrite the packed-refs file, then it is | |
1200 | * unsafe to try to remove loose refs, because doing so might | |
1201 | * expose an obsolete packed value for a reference that might | |
1202 | * even point at an object that has been garbage collected. | |
1203 | */ | |
1204 | if (refnames->nr == 1) | |
1205 | error(_("could not delete reference %s: %s"), | |
1206 | refnames->items[0].string, err.buf); | |
1207 | else | |
1208 | error(_("could not delete references: %s"), err.buf); | |
1209 | ||
1210 | strbuf_release(&err); | |
1211 | return -1; | |
7bd9bcf3 MH |
1212 | } |
1213 | ||
1214 | /* | |
1215 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
1216 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
1217 | * | |
1218 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
1219 | * live into logs/refs. | |
1220 | */ | |
a5c1efd6 | 1221 | #define TMP_RENAMED_LOG "refs/.tmp-renamed-log" |
7bd9bcf3 | 1222 | |
e9dcc305 NTND |
1223 | struct rename_cb { |
1224 | const char *tmp_renamed_log; | |
1225 | int true_errno; | |
1226 | }; | |
1227 | ||
1228 | static int rename_tmp_log_callback(const char *path, void *cb_data) | |
7bd9bcf3 | 1229 | { |
e9dcc305 | 1230 | struct rename_cb *cb = cb_data; |
7bd9bcf3 | 1231 | |
e9dcc305 | 1232 | if (rename(cb->tmp_renamed_log, path)) { |
6a7f3631 MH |
1233 | /* |
1234 | * rename(a, b) when b is an existing directory ought | |
1235 | * to result in ISDIR, but Solaris 5.8 gives ENOTDIR. | |
1236 | * Sheesh. Record the true errno for error reporting, | |
1237 | * but report EISDIR to raceproof_create_file() so | |
1238 | * that it knows to retry. | |
1239 | */ | |
e9dcc305 | 1240 | cb->true_errno = errno; |
6a7f3631 MH |
1241 | if (errno == ENOTDIR) |
1242 | errno = EISDIR; | |
1243 | return -1; | |
1244 | } else { | |
1245 | return 0; | |
7bd9bcf3 | 1246 | } |
6a7f3631 | 1247 | } |
7bd9bcf3 | 1248 | |
802de3da | 1249 | static int rename_tmp_log(struct files_ref_store *refs, const char *newrefname) |
6a7f3631 | 1250 | { |
e9dcc305 NTND |
1251 | struct strbuf path = STRBUF_INIT; |
1252 | struct strbuf tmp = STRBUF_INIT; | |
1253 | struct rename_cb cb; | |
1254 | int ret; | |
6a7f3631 | 1255 | |
802de3da NTND |
1256 | files_reflog_path(refs, &path, newrefname); |
1257 | files_reflog_path(refs, &tmp, TMP_RENAMED_LOG); | |
e9dcc305 NTND |
1258 | cb.tmp_renamed_log = tmp.buf; |
1259 | ret = raceproof_create_file(path.buf, rename_tmp_log_callback, &cb); | |
6a7f3631 MH |
1260 | if (ret) { |
1261 | if (errno == EISDIR) | |
e9dcc305 | 1262 | error("directory not empty: %s", path.buf); |
6a7f3631 | 1263 | else |
990c98d2 | 1264 | error("unable to move logfile %s to %s: %s", |
e9dcc305 NTND |
1265 | tmp.buf, path.buf, |
1266 | strerror(cb.true_errno)); | |
7bd9bcf3 | 1267 | } |
6a7f3631 | 1268 | |
e9dcc305 NTND |
1269 | strbuf_release(&path); |
1270 | strbuf_release(&tmp); | |
7bd9bcf3 MH |
1271 | return ret; |
1272 | } | |
1273 | ||
7bd9bcf3 | 1274 | static int write_ref_to_lockfile(struct ref_lock *lock, |
4417df8c | 1275 | const struct object_id *oid, struct strbuf *err); |
f18a7892 MH |
1276 | static int commit_ref_update(struct files_ref_store *refs, |
1277 | struct ref_lock *lock, | |
4417df8c | 1278 | const struct object_id *oid, const char *logmsg, |
5d9b2de4 | 1279 | struct strbuf *err); |
7bd9bcf3 | 1280 | |
52d59cc6 | 1281 | static int files_copy_or_rename_ref(struct ref_store *ref_store, |
9b6b40d9 | 1282 | const char *oldrefname, const char *newrefname, |
52d59cc6 | 1283 | const char *logmsg, int copy) |
7bd9bcf3 | 1284 | { |
9b6b40d9 | 1285 | struct files_ref_store *refs = |
9e7ec634 | 1286 | files_downcast(ref_store, REF_STORE_WRITE, "rename_ref"); |
4417df8c | 1287 | struct object_id oid, orig_oid; |
7bd9bcf3 MH |
1288 | int flag = 0, logmoved = 0; |
1289 | struct ref_lock *lock; | |
1290 | struct stat loginfo; | |
e9dcc305 NTND |
1291 | struct strbuf sb_oldref = STRBUF_INIT; |
1292 | struct strbuf sb_newref = STRBUF_INIT; | |
1293 | struct strbuf tmp_renamed_log = STRBUF_INIT; | |
1294 | int log, ret; | |
7bd9bcf3 MH |
1295 | struct strbuf err = STRBUF_INIT; |
1296 | ||
802de3da NTND |
1297 | files_reflog_path(refs, &sb_oldref, oldrefname); |
1298 | files_reflog_path(refs, &sb_newref, newrefname); | |
1299 | files_reflog_path(refs, &tmp_renamed_log, TMP_RENAMED_LOG); | |
e9dcc305 NTND |
1300 | |
1301 | log = !lstat(sb_oldref.buf, &loginfo); | |
0a3f07d6 NTND |
1302 | if (log && S_ISLNK(loginfo.st_mode)) { |
1303 | ret = error("reflog for %s is a symlink", oldrefname); | |
1304 | goto out; | |
1305 | } | |
7bd9bcf3 | 1306 | |
2f40e954 NTND |
1307 | if (!refs_resolve_ref_unsafe(&refs->base, oldrefname, |
1308 | RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE, | |
49e61479 | 1309 | &orig_oid, &flag)) { |
0a3f07d6 NTND |
1310 | ret = error("refname %s not found", oldrefname); |
1311 | goto out; | |
1312 | } | |
e711b1af | 1313 | |
0a3f07d6 | 1314 | if (flag & REF_ISSYMREF) { |
52d59cc6 SD |
1315 | if (copy) |
1316 | ret = error("refname %s is a symbolic ref, copying it is not supported", | |
1317 | oldrefname); | |
1318 | else | |
1319 | ret = error("refname %s is a symbolic ref, renaming it is not supported", | |
1320 | oldrefname); | |
0a3f07d6 NTND |
1321 | goto out; |
1322 | } | |
7d2df051 | 1323 | if (!refs_rename_ref_available(&refs->base, oldrefname, newrefname)) { |
0a3f07d6 NTND |
1324 | ret = 1; |
1325 | goto out; | |
1326 | } | |
7bd9bcf3 | 1327 | |
52d59cc6 | 1328 | if (!copy && log && rename(sb_oldref.buf, tmp_renamed_log.buf)) { |
a5c1efd6 | 1329 | ret = error("unable to move logfile logs/%s to logs/"TMP_RENAMED_LOG": %s", |
0a3f07d6 NTND |
1330 | oldrefname, strerror(errno)); |
1331 | goto out; | |
1332 | } | |
7bd9bcf3 | 1333 | |
52d59cc6 SD |
1334 | if (copy && log && copy_file(tmp_renamed_log.buf, sb_oldref.buf, 0644)) { |
1335 | ret = error("unable to copy logfile logs/%s to logs/"TMP_RENAMED_LOG": %s", | |
1336 | oldrefname, strerror(errno)); | |
1337 | goto out; | |
1338 | } | |
1339 | ||
1340 | if (!copy && refs_delete_ref(&refs->base, logmsg, oldrefname, | |
91774afc | 1341 | &orig_oid, REF_NO_DEREF)) { |
7bd9bcf3 MH |
1342 | error("unable to delete old %s", oldrefname); |
1343 | goto rollback; | |
1344 | } | |
1345 | ||
12fd3496 | 1346 | /* |
4417df8c | 1347 | * Since we are doing a shallow lookup, oid is not the |
1348 | * correct value to pass to delete_ref as old_oid. But that | |
1349 | * doesn't matter, because an old_oid check wouldn't add to | |
12fd3496 DT |
1350 | * the safety anyway; we want to delete the reference whatever |
1351 | * its current value. | |
1352 | */ | |
52d59cc6 | 1353 | if (!copy && !refs_read_ref_full(&refs->base, newrefname, |
2f40e954 | 1354 | RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE, |
34c290a6 | 1355 | &oid, NULL) && |
2f40e954 | 1356 | refs_delete_ref(&refs->base, NULL, newrefname, |
91774afc | 1357 | NULL, REF_NO_DEREF)) { |
58364324 | 1358 | if (errno == EISDIR) { |
7bd9bcf3 MH |
1359 | struct strbuf path = STRBUF_INIT; |
1360 | int result; | |
1361 | ||
19e02f4f | 1362 | files_ref_path(refs, &path, newrefname); |
7bd9bcf3 MH |
1363 | result = remove_empty_directories(&path); |
1364 | strbuf_release(&path); | |
1365 | ||
1366 | if (result) { | |
1367 | error("Directory not empty: %s", newrefname); | |
1368 | goto rollback; | |
1369 | } | |
1370 | } else { | |
1371 | error("unable to delete existing %s", newrefname); | |
1372 | goto rollback; | |
1373 | } | |
1374 | } | |
1375 | ||
802de3da | 1376 | if (log && rename_tmp_log(refs, newrefname)) |
7bd9bcf3 MH |
1377 | goto rollback; |
1378 | ||
1379 | logmoved = log; | |
1380 | ||
4f01e508 | 1381 | lock = lock_ref_oid_basic(refs, newrefname, NULL, NULL, NULL, |
91774afc | 1382 | REF_NO_DEREF, NULL, &err); |
7bd9bcf3 | 1383 | if (!lock) { |
52d59cc6 SD |
1384 | if (copy) |
1385 | error("unable to copy '%s' to '%s': %s", oldrefname, newrefname, err.buf); | |
1386 | else | |
1387 | error("unable to rename '%s' to '%s': %s", oldrefname, newrefname, err.buf); | |
7bd9bcf3 MH |
1388 | strbuf_release(&err); |
1389 | goto rollback; | |
1390 | } | |
4417df8c | 1391 | oidcpy(&lock->old_oid, &orig_oid); |
7bd9bcf3 | 1392 | |
4417df8c | 1393 | if (write_ref_to_lockfile(lock, &orig_oid, &err) || |
1394 | commit_ref_update(refs, lock, &orig_oid, logmsg, &err)) { | |
7bd9bcf3 MH |
1395 | error("unable to write current sha1 into %s: %s", newrefname, err.buf); |
1396 | strbuf_release(&err); | |
1397 | goto rollback; | |
1398 | } | |
1399 | ||
0a3f07d6 NTND |
1400 | ret = 0; |
1401 | goto out; | |
7bd9bcf3 MH |
1402 | |
1403 | rollback: | |
4f01e508 | 1404 | lock = lock_ref_oid_basic(refs, oldrefname, NULL, NULL, NULL, |
91774afc | 1405 | REF_NO_DEREF, NULL, &err); |
7bd9bcf3 MH |
1406 | if (!lock) { |
1407 | error("unable to lock %s for rollback: %s", oldrefname, err.buf); | |
1408 | strbuf_release(&err); | |
1409 | goto rollbacklog; | |
1410 | } | |
1411 | ||
1412 | flag = log_all_ref_updates; | |
341fb286 | 1413 | log_all_ref_updates = LOG_REFS_NONE; |
4417df8c | 1414 | if (write_ref_to_lockfile(lock, &orig_oid, &err) || |
1415 | commit_ref_update(refs, lock, &orig_oid, NULL, &err)) { | |
7bd9bcf3 MH |
1416 | error("unable to write current sha1 into %s: %s", oldrefname, err.buf); |
1417 | strbuf_release(&err); | |
1418 | } | |
1419 | log_all_ref_updates = flag; | |
1420 | ||
1421 | rollbacklog: | |
e9dcc305 | 1422 | if (logmoved && rename(sb_newref.buf, sb_oldref.buf)) |
7bd9bcf3 MH |
1423 | error("unable to restore logfile %s from %s: %s", |
1424 | oldrefname, newrefname, strerror(errno)); | |
1425 | if (!logmoved && log && | |
e9dcc305 | 1426 | rename(tmp_renamed_log.buf, sb_oldref.buf)) |
a5c1efd6 | 1427 | error("unable to restore logfile %s from logs/"TMP_RENAMED_LOG": %s", |
7bd9bcf3 | 1428 | oldrefname, strerror(errno)); |
0a3f07d6 NTND |
1429 | ret = 1; |
1430 | out: | |
e9dcc305 NTND |
1431 | strbuf_release(&sb_newref); |
1432 | strbuf_release(&sb_oldref); | |
1433 | strbuf_release(&tmp_renamed_log); | |
1434 | ||
0a3f07d6 | 1435 | return ret; |
7bd9bcf3 MH |
1436 | } |
1437 | ||
52d59cc6 SD |
1438 | static int files_rename_ref(struct ref_store *ref_store, |
1439 | const char *oldrefname, const char *newrefname, | |
1440 | const char *logmsg) | |
1441 | { | |
1442 | return files_copy_or_rename_ref(ref_store, oldrefname, | |
1443 | newrefname, logmsg, 0); | |
1444 | } | |
1445 | ||
1446 | static int files_copy_ref(struct ref_store *ref_store, | |
1447 | const char *oldrefname, const char *newrefname, | |
1448 | const char *logmsg) | |
1449 | { | |
1450 | return files_copy_or_rename_ref(ref_store, oldrefname, | |
1451 | newrefname, logmsg, 1); | |
1452 | } | |
1453 | ||
83a3069a | 1454 | static int close_ref_gently(struct ref_lock *lock) |
7bd9bcf3 | 1455 | { |
ee4d8e45 | 1456 | if (close_lock_file_gently(&lock->lk)) |
7bd9bcf3 MH |
1457 | return -1; |
1458 | return 0; | |
1459 | } | |
1460 | ||
1461 | static int commit_ref(struct ref_lock *lock) | |
1462 | { | |
ee4d8e45 | 1463 | char *path = get_locked_file_path(&lock->lk); |
5387c0d8 MH |
1464 | struct stat st; |
1465 | ||
1466 | if (!lstat(path, &st) && S_ISDIR(st.st_mode)) { | |
1467 | /* | |
1468 | * There is a directory at the path we want to rename | |
1469 | * the lockfile to. Hopefully it is empty; try to | |
1470 | * delete it. | |
1471 | */ | |
1472 | size_t len = strlen(path); | |
1473 | struct strbuf sb_path = STRBUF_INIT; | |
1474 | ||
1475 | strbuf_attach(&sb_path, path, len, len); | |
1476 | ||
1477 | /* | |
1478 | * If this fails, commit_lock_file() will also fail | |
1479 | * and will report the problem. | |
1480 | */ | |
1481 | remove_empty_directories(&sb_path); | |
1482 | strbuf_release(&sb_path); | |
1483 | } else { | |
1484 | free(path); | |
1485 | } | |
1486 | ||
ee4d8e45 | 1487 | if (commit_lock_file(&lock->lk)) |
7bd9bcf3 MH |
1488 | return -1; |
1489 | return 0; | |
1490 | } | |
1491 | ||
1fb0c809 MH |
1492 | static int open_or_create_logfile(const char *path, void *cb) |
1493 | { | |
1494 | int *fd = cb; | |
1495 | ||
1496 | *fd = open(path, O_APPEND | O_WRONLY | O_CREAT, 0666); | |
1497 | return (*fd < 0) ? -1 : 0; | |
1498 | } | |
1499 | ||
7bd9bcf3 | 1500 | /* |
4533e534 MH |
1501 | * Create a reflog for a ref. If force_create = 0, only create the |
1502 | * reflog for certain refs (those for which should_autocreate_reflog | |
1503 | * returns non-zero). Otherwise, create it regardless of the reference | |
1504 | * name. If the logfile already existed or was created, return 0 and | |
1505 | * set *logfd to the file descriptor opened for appending to the file. | |
1506 | * If no logfile exists and we decided not to create one, return 0 and | |
1507 | * set *logfd to -1. On failure, fill in *err, set *logfd to -1, and | |
1508 | * return -1. | |
7bd9bcf3 | 1509 | */ |
802de3da NTND |
1510 | static int log_ref_setup(struct files_ref_store *refs, |
1511 | const char *refname, int force_create, | |
4533e534 | 1512 | int *logfd, struct strbuf *err) |
7bd9bcf3 | 1513 | { |
802de3da NTND |
1514 | struct strbuf logfile_sb = STRBUF_INIT; |
1515 | char *logfile; | |
1516 | ||
1517 | files_reflog_path(refs, &logfile_sb, refname); | |
1518 | logfile = strbuf_detach(&logfile_sb, NULL); | |
7bd9bcf3 | 1519 | |
7bd9bcf3 | 1520 | if (force_create || should_autocreate_reflog(refname)) { |
4533e534 | 1521 | if (raceproof_create_file(logfile, open_or_create_logfile, logfd)) { |
1fb0c809 MH |
1522 | if (errno == ENOENT) |
1523 | strbuf_addf(err, "unable to create directory for '%s': " | |
4533e534 | 1524 | "%s", logfile, strerror(errno)); |
1fb0c809 MH |
1525 | else if (errno == EISDIR) |
1526 | strbuf_addf(err, "there are still logs under '%s'", | |
4533e534 | 1527 | logfile); |
1fb0c809 | 1528 | else |
854bda6b | 1529 | strbuf_addf(err, "unable to append to '%s': %s", |
4533e534 | 1530 | logfile, strerror(errno)); |
7bd9bcf3 | 1531 | |
4533e534 | 1532 | goto error; |
7bd9bcf3 | 1533 | } |
854bda6b | 1534 | } else { |
4533e534 | 1535 | *logfd = open(logfile, O_APPEND | O_WRONLY, 0666); |
e404f459 | 1536 | if (*logfd < 0) { |
854bda6b MH |
1537 | if (errno == ENOENT || errno == EISDIR) { |
1538 | /* | |
1539 | * The logfile doesn't already exist, | |
1540 | * but that is not an error; it only | |
1541 | * means that we won't write log | |
1542 | * entries to it. | |
1543 | */ | |
1544 | ; | |
1545 | } else { | |
1546 | strbuf_addf(err, "unable to append to '%s': %s", | |
4533e534 MH |
1547 | logfile, strerror(errno)); |
1548 | goto error; | |
854bda6b | 1549 | } |
7bd9bcf3 MH |
1550 | } |
1551 | } | |
1552 | ||
e404f459 | 1553 | if (*logfd >= 0) |
4533e534 | 1554 | adjust_shared_perm(logfile); |
854bda6b | 1555 | |
4533e534 | 1556 | free(logfile); |
7bd9bcf3 | 1557 | return 0; |
7bd9bcf3 | 1558 | |
4533e534 MH |
1559 | error: |
1560 | free(logfile); | |
1561 | return -1; | |
7bd9bcf3 | 1562 | } |
7bd9bcf3 | 1563 | |
e3688bd6 DT |
1564 | static int files_create_reflog(struct ref_store *ref_store, |
1565 | const char *refname, int force_create, | |
1566 | struct strbuf *err) | |
7bd9bcf3 | 1567 | { |
802de3da | 1568 | struct files_ref_store *refs = |
9e7ec634 | 1569 | files_downcast(ref_store, REF_STORE_WRITE, "create_reflog"); |
e404f459 | 1570 | int fd; |
7bd9bcf3 | 1571 | |
802de3da | 1572 | if (log_ref_setup(refs, refname, force_create, &fd, err)) |
4533e534 MH |
1573 | return -1; |
1574 | ||
e404f459 MH |
1575 | if (fd >= 0) |
1576 | close(fd); | |
4533e534 MH |
1577 | |
1578 | return 0; | |
7bd9bcf3 MH |
1579 | } |
1580 | ||
4417df8c | 1581 | static int log_ref_write_fd(int fd, const struct object_id *old_oid, |
1582 | const struct object_id *new_oid, | |
7bd9bcf3 MH |
1583 | const char *committer, const char *msg) |
1584 | { | |
1585 | int msglen, written; | |
1586 | unsigned maxlen, len; | |
1587 | char *logrec; | |
1588 | ||
1589 | msglen = msg ? strlen(msg) : 0; | |
1590 | maxlen = strlen(committer) + msglen + 100; | |
1591 | logrec = xmalloc(maxlen); | |
1592 | len = xsnprintf(logrec, maxlen, "%s %s %s\n", | |
4417df8c | 1593 | oid_to_hex(old_oid), |
1594 | oid_to_hex(new_oid), | |
7bd9bcf3 MH |
1595 | committer); |
1596 | if (msglen) | |
1597 | len += copy_reflog_msg(logrec + len - 1, msg) - 1; | |
1598 | ||
1599 | written = len <= maxlen ? write_in_full(fd, logrec, len) : -1; | |
1600 | free(logrec); | |
564bde9a | 1601 | if (written < 0) |
7bd9bcf3 MH |
1602 | return -1; |
1603 | ||
1604 | return 0; | |
1605 | } | |
1606 | ||
802de3da | 1607 | static int files_log_ref_write(struct files_ref_store *refs, |
4417df8c | 1608 | const char *refname, const struct object_id *old_oid, |
1609 | const struct object_id *new_oid, const char *msg, | |
11f8457f | 1610 | int flags, struct strbuf *err) |
7bd9bcf3 | 1611 | { |
e404f459 | 1612 | int logfd, result; |
7bd9bcf3 | 1613 | |
341fb286 CW |
1614 | if (log_all_ref_updates == LOG_REFS_UNSET) |
1615 | log_all_ref_updates = is_bare_repository() ? LOG_REFS_NONE : LOG_REFS_NORMAL; | |
7bd9bcf3 | 1616 | |
802de3da NTND |
1617 | result = log_ref_setup(refs, refname, |
1618 | flags & REF_FORCE_CREATE_REFLOG, | |
4533e534 | 1619 | &logfd, err); |
7bd9bcf3 MH |
1620 | |
1621 | if (result) | |
1622 | return result; | |
1623 | ||
7bd9bcf3 MH |
1624 | if (logfd < 0) |
1625 | return 0; | |
4417df8c | 1626 | result = log_ref_write_fd(logfd, old_oid, new_oid, |
7bd9bcf3 MH |
1627 | git_committer_info(0), msg); |
1628 | if (result) { | |
e9dcc305 | 1629 | struct strbuf sb = STRBUF_INIT; |
87b21e05 MH |
1630 | int save_errno = errno; |
1631 | ||
802de3da | 1632 | files_reflog_path(refs, &sb, refname); |
87b21e05 | 1633 | strbuf_addf(err, "unable to append to '%s': %s", |
e9dcc305 NTND |
1634 | sb.buf, strerror(save_errno)); |
1635 | strbuf_release(&sb); | |
7bd9bcf3 MH |
1636 | close(logfd); |
1637 | return -1; | |
1638 | } | |
1639 | if (close(logfd)) { | |
e9dcc305 | 1640 | struct strbuf sb = STRBUF_INIT; |
87b21e05 MH |
1641 | int save_errno = errno; |
1642 | ||
802de3da | 1643 | files_reflog_path(refs, &sb, refname); |
87b21e05 | 1644 | strbuf_addf(err, "unable to append to '%s': %s", |
e9dcc305 NTND |
1645 | sb.buf, strerror(save_errno)); |
1646 | strbuf_release(&sb); | |
7bd9bcf3 MH |
1647 | return -1; |
1648 | } | |
1649 | return 0; | |
1650 | } | |
1651 | ||
7bd9bcf3 | 1652 | /* |
78fb4579 MH |
1653 | * Write oid into the open lockfile, then close the lockfile. On |
1654 | * errors, rollback the lockfile, fill in *err and return -1. | |
7bd9bcf3 MH |
1655 | */ |
1656 | static int write_ref_to_lockfile(struct ref_lock *lock, | |
4417df8c | 1657 | const struct object_id *oid, struct strbuf *err) |
7bd9bcf3 MH |
1658 | { |
1659 | static char term = '\n'; | |
1660 | struct object *o; | |
1661 | int fd; | |
1662 | ||
109cd76d | 1663 | o = parse_object(the_repository, oid); |
7bd9bcf3 MH |
1664 | if (!o) { |
1665 | strbuf_addf(err, | |
0568c8e9 | 1666 | "trying to write ref '%s' with nonexistent object %s", |
4417df8c | 1667 | lock->ref_name, oid_to_hex(oid)); |
7bd9bcf3 MH |
1668 | unlock_ref(lock); |
1669 | return -1; | |
1670 | } | |
1671 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1672 | strbuf_addf(err, | |
0568c8e9 | 1673 | "trying to write non-commit object %s to branch '%s'", |
4417df8c | 1674 | oid_to_hex(oid), lock->ref_name); |
7bd9bcf3 MH |
1675 | unlock_ref(lock); |
1676 | return -1; | |
1677 | } | |
ee4d8e45 | 1678 | fd = get_lock_file_fd(&lock->lk); |
06f46f23 JK |
1679 | if (write_in_full(fd, oid_to_hex(oid), GIT_SHA1_HEXSZ) < 0 || |
1680 | write_in_full(fd, &term, 1) < 0 || | |
83a3069a | 1681 | close_ref_gently(lock) < 0) { |
7bd9bcf3 | 1682 | strbuf_addf(err, |
ee4d8e45 | 1683 | "couldn't write '%s'", get_lock_file_path(&lock->lk)); |
7bd9bcf3 MH |
1684 | unlock_ref(lock); |
1685 | return -1; | |
1686 | } | |
1687 | return 0; | |
1688 | } | |
1689 | ||
1690 | /* | |
1691 | * Commit a change to a loose reference that has already been written | |
1692 | * to the loose reference lockfile. Also update the reflogs if | |
1693 | * necessary, using the specified lockmsg (which can be NULL). | |
1694 | */ | |
f18a7892 MH |
1695 | static int commit_ref_update(struct files_ref_store *refs, |
1696 | struct ref_lock *lock, | |
4417df8c | 1697 | const struct object_id *oid, const char *logmsg, |
5d9b2de4 | 1698 | struct strbuf *err) |
7bd9bcf3 | 1699 | { |
32c597e7 | 1700 | files_assert_main_repository(refs, "commit_ref_update"); |
00eebe35 MH |
1701 | |
1702 | clear_loose_ref_cache(refs); | |
802de3da | 1703 | if (files_log_ref_write(refs, lock->ref_name, |
4417df8c | 1704 | &lock->old_oid, oid, |
81b1b6d4 | 1705 | logmsg, 0, err)) { |
7bd9bcf3 | 1706 | char *old_msg = strbuf_detach(err, NULL); |
0568c8e9 | 1707 | strbuf_addf(err, "cannot update the ref '%s': %s", |
7bd9bcf3 MH |
1708 | lock->ref_name, old_msg); |
1709 | free(old_msg); | |
1710 | unlock_ref(lock); | |
1711 | return -1; | |
1712 | } | |
7a418f3a MH |
1713 | |
1714 | if (strcmp(lock->ref_name, "HEAD") != 0) { | |
7bd9bcf3 MH |
1715 | /* |
1716 | * Special hack: If a branch is updated directly and HEAD | |
1717 | * points to it (may happen on the remote side of a push | |
1718 | * for example) then logically the HEAD reflog should be | |
1719 | * updated too. | |
1720 | * A generic solution implies reverse symref information, | |
1721 | * but finding all symrefs pointing to the given branch | |
1722 | * would be rather costly for this rare event (the direct | |
1723 | * update of a branch) to be worth it. So let's cheat and | |
1724 | * check with HEAD only which should cover 99% of all usage | |
1725 | * scenarios (even 100% of the default ones). | |
1726 | */ | |
7bd9bcf3 MH |
1727 | int head_flag; |
1728 | const char *head_ref; | |
7a418f3a | 1729 | |
2f40e954 NTND |
1730 | head_ref = refs_resolve_ref_unsafe(&refs->base, "HEAD", |
1731 | RESOLVE_REF_READING, | |
e691b027 | 1732 | NULL, &head_flag); |
7bd9bcf3 MH |
1733 | if (head_ref && (head_flag & REF_ISSYMREF) && |
1734 | !strcmp(head_ref, lock->ref_name)) { | |
1735 | struct strbuf log_err = STRBUF_INIT; | |
802de3da | 1736 | if (files_log_ref_write(refs, "HEAD", |
4417df8c | 1737 | &lock->old_oid, oid, |
802de3da | 1738 | logmsg, 0, &log_err)) { |
7bd9bcf3 MH |
1739 | error("%s", log_err.buf); |
1740 | strbuf_release(&log_err); | |
1741 | } | |
1742 | } | |
1743 | } | |
7a418f3a | 1744 | |
7bd9bcf3 | 1745 | if (commit_ref(lock)) { |
0568c8e9 | 1746 | strbuf_addf(err, "couldn't set '%s'", lock->ref_name); |
7bd9bcf3 MH |
1747 | unlock_ref(lock); |
1748 | return -1; | |
1749 | } | |
1750 | ||
1751 | unlock_ref(lock); | |
1752 | return 0; | |
1753 | } | |
1754 | ||
370e5ad6 | 1755 | static int create_ref_symlink(struct ref_lock *lock, const char *target) |
7bd9bcf3 | 1756 | { |
370e5ad6 | 1757 | int ret = -1; |
7bd9bcf3 | 1758 | #ifndef NO_SYMLINK_HEAD |
ee4d8e45 | 1759 | char *ref_path = get_locked_file_path(&lock->lk); |
370e5ad6 JK |
1760 | unlink(ref_path); |
1761 | ret = symlink(target, ref_path); | |
1762 | free(ref_path); | |
1763 | ||
1764 | if (ret) | |
7bd9bcf3 | 1765 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
7bd9bcf3 | 1766 | #endif |
370e5ad6 JK |
1767 | return ret; |
1768 | } | |
7bd9bcf3 | 1769 | |
802de3da NTND |
1770 | static void update_symref_reflog(struct files_ref_store *refs, |
1771 | struct ref_lock *lock, const char *refname, | |
370e5ad6 JK |
1772 | const char *target, const char *logmsg) |
1773 | { | |
1774 | struct strbuf err = STRBUF_INIT; | |
4417df8c | 1775 | struct object_id new_oid; |
2f40e954 NTND |
1776 | if (logmsg && |
1777 | !refs_read_ref_full(&refs->base, target, | |
34c290a6 | 1778 | RESOLVE_REF_READING, &new_oid, NULL) && |
4417df8c | 1779 | files_log_ref_write(refs, refname, &lock->old_oid, |
1780 | &new_oid, logmsg, 0, &err)) { | |
7bd9bcf3 MH |
1781 | error("%s", err.buf); |
1782 | strbuf_release(&err); | |
1783 | } | |
370e5ad6 | 1784 | } |
7bd9bcf3 | 1785 | |
802de3da NTND |
1786 | static int create_symref_locked(struct files_ref_store *refs, |
1787 | struct ref_lock *lock, const char *refname, | |
370e5ad6 JK |
1788 | const char *target, const char *logmsg) |
1789 | { | |
1790 | if (prefer_symlink_refs && !create_ref_symlink(lock, target)) { | |
802de3da | 1791 | update_symref_reflog(refs, lock, refname, target, logmsg); |
370e5ad6 JK |
1792 | return 0; |
1793 | } | |
1794 | ||
ee4d8e45 | 1795 | if (!fdopen_lock_file(&lock->lk, "w")) |
370e5ad6 | 1796 | return error("unable to fdopen %s: %s", |
ee4d8e45 | 1797 | lock->lk.tempfile->filename.buf, strerror(errno)); |
370e5ad6 | 1798 | |
802de3da | 1799 | update_symref_reflog(refs, lock, refname, target, logmsg); |
396da8f7 | 1800 | |
370e5ad6 | 1801 | /* no error check; commit_ref will check ferror */ |
ee4d8e45 | 1802 | fprintf(lock->lk.tempfile->fp, "ref: %s\n", target); |
370e5ad6 JK |
1803 | if (commit_ref(lock) < 0) |
1804 | return error("unable to write symref for %s: %s", refname, | |
1805 | strerror(errno)); | |
7bd9bcf3 MH |
1806 | return 0; |
1807 | } | |
1808 | ||
284689ba MH |
1809 | static int files_create_symref(struct ref_store *ref_store, |
1810 | const char *refname, const char *target, | |
1811 | const char *logmsg) | |
370e5ad6 | 1812 | { |
7eb27cdf | 1813 | struct files_ref_store *refs = |
9e7ec634 | 1814 | files_downcast(ref_store, REF_STORE_WRITE, "create_symref"); |
370e5ad6 JK |
1815 | struct strbuf err = STRBUF_INIT; |
1816 | struct ref_lock *lock; | |
1817 | int ret; | |
1818 | ||
4f01e508 | 1819 | lock = lock_ref_oid_basic(refs, refname, NULL, |
91774afc | 1820 | NULL, NULL, REF_NO_DEREF, NULL, |
4f01e508 | 1821 | &err); |
370e5ad6 JK |
1822 | if (!lock) { |
1823 | error("%s", err.buf); | |
1824 | strbuf_release(&err); | |
1825 | return -1; | |
1826 | } | |
1827 | ||
802de3da | 1828 | ret = create_symref_locked(refs, lock, refname, target, logmsg); |
370e5ad6 JK |
1829 | unlock_ref(lock); |
1830 | return ret; | |
1831 | } | |
1832 | ||
e3688bd6 DT |
1833 | static int files_reflog_exists(struct ref_store *ref_store, |
1834 | const char *refname) | |
7bd9bcf3 | 1835 | { |
802de3da | 1836 | struct files_ref_store *refs = |
9e7ec634 | 1837 | files_downcast(ref_store, REF_STORE_READ, "reflog_exists"); |
e9dcc305 | 1838 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 | 1839 | struct stat st; |
e9dcc305 | 1840 | int ret; |
7bd9bcf3 | 1841 | |
802de3da | 1842 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
1843 | ret = !lstat(sb.buf, &st) && S_ISREG(st.st_mode); |
1844 | strbuf_release(&sb); | |
1845 | return ret; | |
7bd9bcf3 MH |
1846 | } |
1847 | ||
e3688bd6 DT |
1848 | static int files_delete_reflog(struct ref_store *ref_store, |
1849 | const char *refname) | |
7bd9bcf3 | 1850 | { |
802de3da | 1851 | struct files_ref_store *refs = |
9e7ec634 | 1852 | files_downcast(ref_store, REF_STORE_WRITE, "delete_reflog"); |
e9dcc305 NTND |
1853 | struct strbuf sb = STRBUF_INIT; |
1854 | int ret; | |
1855 | ||
802de3da | 1856 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
1857 | ret = remove_path(sb.buf); |
1858 | strbuf_release(&sb); | |
1859 | return ret; | |
7bd9bcf3 MH |
1860 | } |
1861 | ||
1862 | static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data) | |
1863 | { | |
9461d272 | 1864 | struct object_id ooid, noid; |
7bd9bcf3 | 1865 | char *email_end, *message; |
dddbad72 | 1866 | timestamp_t timestamp; |
7bd9bcf3 | 1867 | int tz; |
43bc3b6c | 1868 | const char *p = sb->buf; |
7bd9bcf3 MH |
1869 | |
1870 | /* old SP new SP name <email> SP time TAB msg LF */ | |
43bc3b6c | 1871 | if (!sb->len || sb->buf[sb->len - 1] != '\n' || |
1872 | parse_oid_hex(p, &ooid, &p) || *p++ != ' ' || | |
1873 | parse_oid_hex(p, &noid, &p) || *p++ != ' ' || | |
1874 | !(email_end = strchr(p, '>')) || | |
7bd9bcf3 | 1875 | email_end[1] != ' ' || |
1aeb7e75 | 1876 | !(timestamp = parse_timestamp(email_end + 2, &message, 10)) || |
7bd9bcf3 MH |
1877 | !message || message[0] != ' ' || |
1878 | (message[1] != '+' && message[1] != '-') || | |
1879 | !isdigit(message[2]) || !isdigit(message[3]) || | |
1880 | !isdigit(message[4]) || !isdigit(message[5])) | |
1881 | return 0; /* corrupt? */ | |
1882 | email_end[1] = '\0'; | |
1883 | tz = strtol(message + 1, NULL, 10); | |
1884 | if (message[6] != '\t') | |
1885 | message += 6; | |
1886 | else | |
1887 | message += 7; | |
43bc3b6c | 1888 | return fn(&ooid, &noid, p, timestamp, tz, message, cb_data); |
7bd9bcf3 MH |
1889 | } |
1890 | ||
1891 | static char *find_beginning_of_line(char *bob, char *scan) | |
1892 | { | |
1893 | while (bob < scan && *(--scan) != '\n') | |
1894 | ; /* keep scanning backwards */ | |
1895 | /* | |
1896 | * Return either beginning of the buffer, or LF at the end of | |
1897 | * the previous line. | |
1898 | */ | |
1899 | return scan; | |
1900 | } | |
1901 | ||
e3688bd6 DT |
1902 | static int files_for_each_reflog_ent_reverse(struct ref_store *ref_store, |
1903 | const char *refname, | |
1904 | each_reflog_ent_fn fn, | |
1905 | void *cb_data) | |
7bd9bcf3 | 1906 | { |
802de3da | 1907 | struct files_ref_store *refs = |
9e7ec634 NTND |
1908 | files_downcast(ref_store, REF_STORE_READ, |
1909 | "for_each_reflog_ent_reverse"); | |
7bd9bcf3 MH |
1910 | struct strbuf sb = STRBUF_INIT; |
1911 | FILE *logfp; | |
1912 | long pos; | |
1913 | int ret = 0, at_tail = 1; | |
1914 | ||
802de3da | 1915 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
1916 | logfp = fopen(sb.buf, "r"); |
1917 | strbuf_release(&sb); | |
7bd9bcf3 MH |
1918 | if (!logfp) |
1919 | return -1; | |
1920 | ||
1921 | /* Jump to the end */ | |
1922 | if (fseek(logfp, 0, SEEK_END) < 0) | |
be686f03 RS |
1923 | ret = error("cannot seek back reflog for %s: %s", |
1924 | refname, strerror(errno)); | |
7bd9bcf3 MH |
1925 | pos = ftell(logfp); |
1926 | while (!ret && 0 < pos) { | |
1927 | int cnt; | |
1928 | size_t nread; | |
1929 | char buf[BUFSIZ]; | |
1930 | char *endp, *scanp; | |
1931 | ||
1932 | /* Fill next block from the end */ | |
1933 | cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos; | |
be686f03 RS |
1934 | if (fseek(logfp, pos - cnt, SEEK_SET)) { |
1935 | ret = error("cannot seek back reflog for %s: %s", | |
1936 | refname, strerror(errno)); | |
1937 | break; | |
1938 | } | |
7bd9bcf3 | 1939 | nread = fread(buf, cnt, 1, logfp); |
be686f03 RS |
1940 | if (nread != 1) { |
1941 | ret = error("cannot read %d bytes from reflog for %s: %s", | |
1942 | cnt, refname, strerror(errno)); | |
1943 | break; | |
1944 | } | |
7bd9bcf3 MH |
1945 | pos -= cnt; |
1946 | ||
1947 | scanp = endp = buf + cnt; | |
1948 | if (at_tail && scanp[-1] == '\n') | |
1949 | /* Looking at the final LF at the end of the file */ | |
1950 | scanp--; | |
1951 | at_tail = 0; | |
1952 | ||
1953 | while (buf < scanp) { | |
1954 | /* | |
1955 | * terminating LF of the previous line, or the beginning | |
1956 | * of the buffer. | |
1957 | */ | |
1958 | char *bp; | |
1959 | ||
1960 | bp = find_beginning_of_line(buf, scanp); | |
1961 | ||
1962 | if (*bp == '\n') { | |
1963 | /* | |
1964 | * The newline is the end of the previous line, | |
1965 | * so we know we have complete line starting | |
1966 | * at (bp + 1). Prefix it onto any prior data | |
1967 | * we collected for the line and process it. | |
1968 | */ | |
1969 | strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1)); | |
1970 | scanp = bp; | |
1971 | endp = bp + 1; | |
1972 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
1973 | strbuf_reset(&sb); | |
1974 | if (ret) | |
1975 | break; | |
1976 | } else if (!pos) { | |
1977 | /* | |
1978 | * We are at the start of the buffer, and the | |
1979 | * start of the file; there is no previous | |
1980 | * line, and we have everything for this one. | |
1981 | * Process it, and we can end the loop. | |
1982 | */ | |
1983 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
1984 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
1985 | strbuf_reset(&sb); | |
1986 | break; | |
1987 | } | |
1988 | ||
1989 | if (bp == buf) { | |
1990 | /* | |
1991 | * We are at the start of the buffer, and there | |
1992 | * is more file to read backwards. Which means | |
1993 | * we are in the middle of a line. Note that we | |
1994 | * may get here even if *bp was a newline; that | |
1995 | * just means we are at the exact end of the | |
1996 | * previous line, rather than some spot in the | |
1997 | * middle. | |
1998 | * | |
1999 | * Save away what we have to be combined with | |
2000 | * the data from the next read. | |
2001 | */ | |
2002 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
2003 | break; | |
2004 | } | |
2005 | } | |
2006 | ||
2007 | } | |
2008 | if (!ret && sb.len) | |
033abf97 | 2009 | BUG("reverse reflog parser had leftover data"); |
7bd9bcf3 MH |
2010 | |
2011 | fclose(logfp); | |
2012 | strbuf_release(&sb); | |
2013 | return ret; | |
2014 | } | |
2015 | ||
e3688bd6 DT |
2016 | static int files_for_each_reflog_ent(struct ref_store *ref_store, |
2017 | const char *refname, | |
2018 | each_reflog_ent_fn fn, void *cb_data) | |
7bd9bcf3 | 2019 | { |
802de3da | 2020 | struct files_ref_store *refs = |
9e7ec634 NTND |
2021 | files_downcast(ref_store, REF_STORE_READ, |
2022 | "for_each_reflog_ent"); | |
7bd9bcf3 MH |
2023 | FILE *logfp; |
2024 | struct strbuf sb = STRBUF_INIT; | |
2025 | int ret = 0; | |
2026 | ||
802de3da | 2027 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
2028 | logfp = fopen(sb.buf, "r"); |
2029 | strbuf_release(&sb); | |
7bd9bcf3 MH |
2030 | if (!logfp) |
2031 | return -1; | |
2032 | ||
2033 | while (!ret && !strbuf_getwholeline(&sb, logfp, '\n')) | |
2034 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
2035 | fclose(logfp); | |
2036 | strbuf_release(&sb); | |
2037 | return ret; | |
2038 | } | |
7bd9bcf3 | 2039 | |
2880d16f MH |
2040 | struct files_reflog_iterator { |
2041 | struct ref_iterator base; | |
7bd9bcf3 | 2042 | |
2f40e954 | 2043 | struct ref_store *ref_store; |
2880d16f MH |
2044 | struct dir_iterator *dir_iterator; |
2045 | struct object_id oid; | |
2046 | }; | |
7bd9bcf3 | 2047 | |
2880d16f MH |
2048 | static int files_reflog_iterator_advance(struct ref_iterator *ref_iterator) |
2049 | { | |
2050 | struct files_reflog_iterator *iter = | |
2051 | (struct files_reflog_iterator *)ref_iterator; | |
2052 | struct dir_iterator *diter = iter->dir_iterator; | |
2053 | int ok; | |
2054 | ||
2055 | while ((ok = dir_iterator_advance(diter)) == ITER_OK) { | |
2056 | int flags; | |
2057 | ||
2058 | if (!S_ISREG(diter->st.st_mode)) | |
7bd9bcf3 | 2059 | continue; |
2880d16f MH |
2060 | if (diter->basename[0] == '.') |
2061 | continue; | |
2062 | if (ends_with(diter->basename, ".lock")) | |
7bd9bcf3 | 2063 | continue; |
7bd9bcf3 | 2064 | |
2f40e954 NTND |
2065 | if (refs_read_ref_full(iter->ref_store, |
2066 | diter->relative_path, 0, | |
34c290a6 | 2067 | &iter->oid, &flags)) { |
2880d16f MH |
2068 | error("bad ref for %s", diter->path.buf); |
2069 | continue; | |
7bd9bcf3 | 2070 | } |
2880d16f MH |
2071 | |
2072 | iter->base.refname = diter->relative_path; | |
2073 | iter->base.oid = &iter->oid; | |
2074 | iter->base.flags = flags; | |
2075 | return ITER_OK; | |
7bd9bcf3 | 2076 | } |
2880d16f MH |
2077 | |
2078 | iter->dir_iterator = NULL; | |
2079 | if (ref_iterator_abort(ref_iterator) == ITER_ERROR) | |
2080 | ok = ITER_ERROR; | |
2081 | return ok; | |
2082 | } | |
2083 | ||
2084 | static int files_reflog_iterator_peel(struct ref_iterator *ref_iterator, | |
2085 | struct object_id *peeled) | |
2086 | { | |
033abf97 | 2087 | BUG("ref_iterator_peel() called for reflog_iterator"); |
2880d16f MH |
2088 | } |
2089 | ||
2090 | static int files_reflog_iterator_abort(struct ref_iterator *ref_iterator) | |
2091 | { | |
2092 | struct files_reflog_iterator *iter = | |
2093 | (struct files_reflog_iterator *)ref_iterator; | |
2094 | int ok = ITER_DONE; | |
2095 | ||
2096 | if (iter->dir_iterator) | |
2097 | ok = dir_iterator_abort(iter->dir_iterator); | |
2098 | ||
2099 | base_ref_iterator_free(ref_iterator); | |
2100 | return ok; | |
2101 | } | |
2102 | ||
2103 | static struct ref_iterator_vtable files_reflog_iterator_vtable = { | |
2104 | files_reflog_iterator_advance, | |
2105 | files_reflog_iterator_peel, | |
2106 | files_reflog_iterator_abort | |
2107 | }; | |
2108 | ||
944b4e30 NTND |
2109 | static struct ref_iterator *reflog_iterator_begin(struct ref_store *ref_store, |
2110 | const char *gitdir) | |
2880d16f MH |
2111 | { |
2112 | struct files_reflog_iterator *iter = xcalloc(1, sizeof(*iter)); | |
2113 | struct ref_iterator *ref_iterator = &iter->base; | |
e9dcc305 | 2114 | struct strbuf sb = STRBUF_INIT; |
2880d16f | 2115 | |
8738a8a4 | 2116 | base_ref_iterator_init(ref_iterator, &files_reflog_iterator_vtable, 0); |
944b4e30 | 2117 | strbuf_addf(&sb, "%s/logs", gitdir); |
e9dcc305 | 2118 | iter->dir_iterator = dir_iterator_begin(sb.buf); |
2f40e954 | 2119 | iter->ref_store = ref_store; |
e9dcc305 | 2120 | strbuf_release(&sb); |
944b4e30 | 2121 | |
2880d16f | 2122 | return ref_iterator; |
7bd9bcf3 MH |
2123 | } |
2124 | ||
944b4e30 NTND |
2125 | static enum iterator_selection reflog_iterator_select( |
2126 | struct ref_iterator *iter_worktree, | |
2127 | struct ref_iterator *iter_common, | |
2128 | void *cb_data) | |
2129 | { | |
2130 | if (iter_worktree) { | |
2131 | /* | |
2132 | * We're a bit loose here. We probably should ignore | |
2133 | * common refs if they are accidentally added as | |
2134 | * per-worktree refs. | |
2135 | */ | |
2136 | return ITER_SELECT_0; | |
2137 | } else if (iter_common) { | |
2138 | if (ref_type(iter_common->refname) == REF_TYPE_NORMAL) | |
2139 | return ITER_SELECT_1; | |
2140 | ||
2141 | /* | |
2142 | * The main ref store may contain main worktree's | |
2143 | * per-worktree refs, which should be ignored | |
2144 | */ | |
2145 | return ITER_SKIP_1; | |
2146 | } else | |
2147 | return ITER_DONE; | |
2148 | } | |
2149 | ||
2150 | static struct ref_iterator *files_reflog_iterator_begin(struct ref_store *ref_store) | |
2151 | { | |
2152 | struct files_ref_store *refs = | |
2153 | files_downcast(ref_store, REF_STORE_READ, | |
2154 | "reflog_iterator_begin"); | |
2155 | ||
2156 | if (!strcmp(refs->gitdir, refs->gitcommondir)) { | |
2157 | return reflog_iterator_begin(ref_store, refs->gitcommondir); | |
2158 | } else { | |
2159 | return merge_ref_iterator_begin( | |
1a2e1a76 | 2160 | 0, |
944b4e30 NTND |
2161 | reflog_iterator_begin(ref_store, refs->gitdir), |
2162 | reflog_iterator_begin(ref_store, refs->gitcommondir), | |
2163 | reflog_iterator_select, refs); | |
2164 | } | |
2165 | } | |
2166 | ||
165056b2 | 2167 | /* |
92b1551b MH |
2168 | * If update is a direct update of head_ref (the reference pointed to |
2169 | * by HEAD), then add an extra REF_LOG_ONLY update for HEAD. | |
2170 | */ | |
2171 | static int split_head_update(struct ref_update *update, | |
2172 | struct ref_transaction *transaction, | |
2173 | const char *head_ref, | |
2174 | struct string_list *affected_refnames, | |
2175 | struct strbuf *err) | |
2176 | { | |
2177 | struct string_list_item *item; | |
2178 | struct ref_update *new_update; | |
2179 | ||
2180 | if ((update->flags & REF_LOG_ONLY) || | |
acedcde7 | 2181 | (update->flags & REF_IS_PRUNING) || |
92b1551b MH |
2182 | (update->flags & REF_UPDATE_VIA_HEAD)) |
2183 | return 0; | |
2184 | ||
2185 | if (strcmp(update->refname, head_ref)) | |
2186 | return 0; | |
2187 | ||
2188 | /* | |
2189 | * First make sure that HEAD is not already in the | |
276d0e35 | 2190 | * transaction. This check is O(lg N) in the transaction |
92b1551b MH |
2191 | * size, but it happens at most once per transaction. |
2192 | */ | |
276d0e35 | 2193 | if (string_list_has_string(affected_refnames, "HEAD")) { |
92b1551b MH |
2194 | /* An entry already existed */ |
2195 | strbuf_addf(err, | |
2196 | "multiple updates for 'HEAD' (including one " | |
2197 | "via its referent '%s') are not allowed", | |
2198 | update->refname); | |
2199 | return TRANSACTION_NAME_CONFLICT; | |
2200 | } | |
2201 | ||
2202 | new_update = ref_transaction_add_update( | |
2203 | transaction, "HEAD", | |
91774afc | 2204 | update->flags | REF_LOG_ONLY | REF_NO_DEREF, |
89f3bbdd | 2205 | &update->new_oid, &update->old_oid, |
92b1551b MH |
2206 | update->msg); |
2207 | ||
276d0e35 MÅ |
2208 | /* |
2209 | * Add "HEAD". This insertion is O(N) in the transaction | |
2210 | * size, but it happens at most once per transaction. | |
2211 | * Add new_update->refname instead of a literal "HEAD". | |
2212 | */ | |
2213 | if (strcmp(new_update->refname, "HEAD")) | |
2214 | BUG("%s unexpectedly not 'HEAD'", new_update->refname); | |
2215 | item = string_list_insert(affected_refnames, new_update->refname); | |
92b1551b MH |
2216 | item->util = new_update; |
2217 | ||
2218 | return 0; | |
2219 | } | |
2220 | ||
2221 | /* | |
2222 | * update is for a symref that points at referent and doesn't have | |
91774afc MH |
2223 | * REF_NO_DEREF set. Split it into two updates: |
2224 | * - The original update, but with REF_LOG_ONLY and REF_NO_DEREF set | |
92b1551b MH |
2225 | * - A new, separate update for the referent reference |
2226 | * Note that the new update will itself be subject to splitting when | |
2227 | * the iteration gets to it. | |
2228 | */ | |
fcc42ea0 MH |
2229 | static int split_symref_update(struct files_ref_store *refs, |
2230 | struct ref_update *update, | |
92b1551b MH |
2231 | const char *referent, |
2232 | struct ref_transaction *transaction, | |
2233 | struct string_list *affected_refnames, | |
2234 | struct strbuf *err) | |
2235 | { | |
2236 | struct string_list_item *item; | |
2237 | struct ref_update *new_update; | |
2238 | unsigned int new_flags; | |
2239 | ||
2240 | /* | |
2241 | * First make sure that referent is not already in the | |
c299468b | 2242 | * transaction. This check is O(lg N) in the transaction |
92b1551b MH |
2243 | * size, but it happens at most once per symref in a |
2244 | * transaction. | |
2245 | */ | |
c299468b MÅ |
2246 | if (string_list_has_string(affected_refnames, referent)) { |
2247 | /* An entry already exists */ | |
92b1551b MH |
2248 | strbuf_addf(err, |
2249 | "multiple updates for '%s' (including one " | |
2250 | "via symref '%s') are not allowed", | |
2251 | referent, update->refname); | |
2252 | return TRANSACTION_NAME_CONFLICT; | |
2253 | } | |
2254 | ||
2255 | new_flags = update->flags; | |
2256 | if (!strcmp(update->refname, "HEAD")) { | |
2257 | /* | |
2258 | * Record that the new update came via HEAD, so that | |
2259 | * when we process it, split_head_update() doesn't try | |
2260 | * to add another reflog update for HEAD. Note that | |
2261 | * this bit will be propagated if the new_update | |
2262 | * itself needs to be split. | |
2263 | */ | |
2264 | new_flags |= REF_UPDATE_VIA_HEAD; | |
2265 | } | |
2266 | ||
2267 | new_update = ref_transaction_add_update( | |
2268 | transaction, referent, new_flags, | |
89f3bbdd | 2269 | &update->new_oid, &update->old_oid, |
92b1551b MH |
2270 | update->msg); |
2271 | ||
6e30b2f6 MH |
2272 | new_update->parent_update = update; |
2273 | ||
2274 | /* | |
2275 | * Change the symbolic ref update to log only. Also, it | |
78fb4579 | 2276 | * doesn't need to check its old OID value, as that will be |
6e30b2f6 MH |
2277 | * done when new_update is processed. |
2278 | */ | |
91774afc | 2279 | update->flags |= REF_LOG_ONLY | REF_NO_DEREF; |
6e30b2f6 | 2280 | update->flags &= ~REF_HAVE_OLD; |
92b1551b | 2281 | |
c299468b MÅ |
2282 | /* |
2283 | * Add the referent. This insertion is O(N) in the transaction | |
2284 | * size, but it happens at most once per symref in a | |
2285 | * transaction. Make sure to add new_update->refname, which will | |
2286 | * be valid as long as affected_refnames is in use, and NOT | |
2287 | * referent, which might soon be freed by our caller. | |
2288 | */ | |
2289 | item = string_list_insert(affected_refnames, new_update->refname); | |
2290 | if (item->util) | |
2291 | BUG("%s unexpectedly found in affected_refnames", | |
2292 | new_update->refname); | |
92b1551b MH |
2293 | item->util = new_update; |
2294 | ||
2295 | return 0; | |
2296 | } | |
2297 | ||
6e30b2f6 MH |
2298 | /* |
2299 | * Return the refname under which update was originally requested. | |
2300 | */ | |
2301 | static const char *original_update_refname(struct ref_update *update) | |
2302 | { | |
2303 | while (update->parent_update) | |
2304 | update = update->parent_update; | |
2305 | ||
2306 | return update->refname; | |
2307 | } | |
2308 | ||
e3f51039 MH |
2309 | /* |
2310 | * Check whether the REF_HAVE_OLD and old_oid values stored in update | |
2311 | * are consistent with oid, which is the reference's current value. If | |
2312 | * everything is OK, return 0; otherwise, write an error message to | |
2313 | * err and return -1. | |
2314 | */ | |
2315 | static int check_old_oid(struct ref_update *update, struct object_id *oid, | |
2316 | struct strbuf *err) | |
2317 | { | |
2318 | if (!(update->flags & REF_HAVE_OLD) || | |
98491298 | 2319 | !oidcmp(oid, &update->old_oid)) |
e3f51039 MH |
2320 | return 0; |
2321 | ||
98491298 | 2322 | if (is_null_oid(&update->old_oid)) |
e3f51039 MH |
2323 | strbuf_addf(err, "cannot lock ref '%s': " |
2324 | "reference already exists", | |
2325 | original_update_refname(update)); | |
2326 | else if (is_null_oid(oid)) | |
2327 | strbuf_addf(err, "cannot lock ref '%s': " | |
2328 | "reference is missing but expected %s", | |
2329 | original_update_refname(update), | |
98491298 | 2330 | oid_to_hex(&update->old_oid)); |
e3f51039 MH |
2331 | else |
2332 | strbuf_addf(err, "cannot lock ref '%s': " | |
2333 | "is at %s but expected %s", | |
2334 | original_update_refname(update), | |
2335 | oid_to_hex(oid), | |
98491298 | 2336 | oid_to_hex(&update->old_oid)); |
e3f51039 MH |
2337 | |
2338 | return -1; | |
2339 | } | |
2340 | ||
92b1551b MH |
2341 | /* |
2342 | * Prepare for carrying out update: | |
2343 | * - Lock the reference referred to by update. | |
2344 | * - Read the reference under lock. | |
78fb4579 | 2345 | * - Check that its old OID value (if specified) is correct, and in |
92b1551b MH |
2346 | * any case record it in update->lock->old_oid for later use when |
2347 | * writing the reflog. | |
91774afc | 2348 | * - If it is a symref update without REF_NO_DEREF, split it up into a |
92b1551b MH |
2349 | * REF_LOG_ONLY update of the symref and add a separate update for |
2350 | * the referent to transaction. | |
2351 | * - If it is an update of head_ref, add a corresponding REF_LOG_ONLY | |
2352 | * update of HEAD. | |
165056b2 | 2353 | */ |
b3bbbc5c MH |
2354 | static int lock_ref_for_update(struct files_ref_store *refs, |
2355 | struct ref_update *update, | |
165056b2 | 2356 | struct ref_transaction *transaction, |
92b1551b | 2357 | const char *head_ref, |
165056b2 MH |
2358 | struct string_list *affected_refnames, |
2359 | struct strbuf *err) | |
2360 | { | |
92b1551b MH |
2361 | struct strbuf referent = STRBUF_INIT; |
2362 | int mustexist = (update->flags & REF_HAVE_OLD) && | |
98491298 | 2363 | !is_null_oid(&update->old_oid); |
851e1fbd | 2364 | int ret = 0; |
92b1551b | 2365 | struct ref_lock *lock; |
165056b2 | 2366 | |
32c597e7 | 2367 | files_assert_main_repository(refs, "lock_ref_for_update"); |
b3bbbc5c | 2368 | |
98491298 | 2369 | if ((update->flags & REF_HAVE_NEW) && is_null_oid(&update->new_oid)) |
165056b2 | 2370 | update->flags |= REF_DELETING; |
92b1551b MH |
2371 | |
2372 | if (head_ref) { | |
2373 | ret = split_head_update(update, transaction, head_ref, | |
2374 | affected_refnames, err); | |
2375 | if (ret) | |
851e1fbd | 2376 | goto out; |
92b1551b MH |
2377 | } |
2378 | ||
f7b0a987 | 2379 | ret = lock_raw_ref(refs, update->refname, mustexist, |
92b1551b | 2380 | affected_refnames, NULL, |
7d618264 | 2381 | &lock, &referent, |
92b1551b | 2382 | &update->type, err); |
92b1551b | 2383 | if (ret) { |
165056b2 MH |
2384 | char *reason; |
2385 | ||
165056b2 MH |
2386 | reason = strbuf_detach(err, NULL); |
2387 | strbuf_addf(err, "cannot lock ref '%s': %s", | |
e3f51039 | 2388 | original_update_refname(update), reason); |
165056b2 | 2389 | free(reason); |
851e1fbd | 2390 | goto out; |
165056b2 | 2391 | } |
92b1551b | 2392 | |
7d618264 | 2393 | update->backend_data = lock; |
92b1551b | 2394 | |
8169d0d0 | 2395 | if (update->type & REF_ISSYMREF) { |
91774afc | 2396 | if (update->flags & REF_NO_DEREF) { |
6e30b2f6 MH |
2397 | /* |
2398 | * We won't be reading the referent as part of | |
2399 | * the transaction, so we have to read it here | |
78fb4579 | 2400 | * to record and possibly check old_oid: |
6e30b2f6 | 2401 | */ |
2f40e954 NTND |
2402 | if (refs_read_ref_full(&refs->base, |
2403 | referent.buf, 0, | |
34c290a6 | 2404 | &lock->old_oid, NULL)) { |
6e30b2f6 MH |
2405 | if (update->flags & REF_HAVE_OLD) { |
2406 | strbuf_addf(err, "cannot lock ref '%s': " | |
e3f51039 MH |
2407 | "error reading reference", |
2408 | original_update_refname(update)); | |
3f5ef95b | 2409 | ret = TRANSACTION_GENERIC_ERROR; |
851e1fbd | 2410 | goto out; |
6e30b2f6 | 2411 | } |
e3f51039 | 2412 | } else if (check_old_oid(update, &lock->old_oid, err)) { |
851e1fbd MÅ |
2413 | ret = TRANSACTION_GENERIC_ERROR; |
2414 | goto out; | |
8169d0d0 | 2415 | } |
6e30b2f6 MH |
2416 | } else { |
2417 | /* | |
2418 | * Create a new update for the reference this | |
2419 | * symref is pointing at. Also, we will record | |
78fb4579 | 2420 | * and verify old_oid for this update as part |
6e30b2f6 MH |
2421 | * of processing the split-off update, so we |
2422 | * don't have to do it here. | |
2423 | */ | |
fcc42ea0 MH |
2424 | ret = split_symref_update(refs, update, |
2425 | referent.buf, transaction, | |
92b1551b MH |
2426 | affected_refnames, err); |
2427 | if (ret) | |
851e1fbd | 2428 | goto out; |
92b1551b | 2429 | } |
6e30b2f6 MH |
2430 | } else { |
2431 | struct ref_update *parent_update; | |
8169d0d0 | 2432 | |
851e1fbd MÅ |
2433 | if (check_old_oid(update, &lock->old_oid, err)) { |
2434 | ret = TRANSACTION_GENERIC_ERROR; | |
2435 | goto out; | |
2436 | } | |
e3f51039 | 2437 | |
6e30b2f6 MH |
2438 | /* |
2439 | * If this update is happening indirectly because of a | |
78fb4579 | 2440 | * symref update, record the old OID in the parent |
6e30b2f6 MH |
2441 | * update: |
2442 | */ | |
2443 | for (parent_update = update->parent_update; | |
2444 | parent_update; | |
2445 | parent_update = parent_update->parent_update) { | |
7d618264 DT |
2446 | struct ref_lock *parent_lock = parent_update->backend_data; |
2447 | oidcpy(&parent_lock->old_oid, &lock->old_oid); | |
6e30b2f6 | 2448 | } |
92b1551b MH |
2449 | } |
2450 | ||
165056b2 MH |
2451 | if ((update->flags & REF_HAVE_NEW) && |
2452 | !(update->flags & REF_DELETING) && | |
2453 | !(update->flags & REF_LOG_ONLY)) { | |
92b1551b | 2454 | if (!(update->type & REF_ISSYMREF) && |
98491298 | 2455 | !oidcmp(&lock->old_oid, &update->new_oid)) { |
165056b2 MH |
2456 | /* |
2457 | * The reference already has the desired | |
2458 | * value, so we don't need to write it. | |
2459 | */ | |
4417df8c | 2460 | } else if (write_ref_to_lockfile(lock, &update->new_oid, |
165056b2 MH |
2461 | err)) { |
2462 | char *write_err = strbuf_detach(err, NULL); | |
2463 | ||
2464 | /* | |
2465 | * The lock was freed upon failure of | |
2466 | * write_ref_to_lockfile(): | |
2467 | */ | |
7d618264 | 2468 | update->backend_data = NULL; |
165056b2 | 2469 | strbuf_addf(err, |
e3f51039 | 2470 | "cannot update ref '%s': %s", |
165056b2 MH |
2471 | update->refname, write_err); |
2472 | free(write_err); | |
851e1fbd MÅ |
2473 | ret = TRANSACTION_GENERIC_ERROR; |
2474 | goto out; | |
165056b2 MH |
2475 | } else { |
2476 | update->flags |= REF_NEEDS_COMMIT; | |
2477 | } | |
2478 | } | |
2479 | if (!(update->flags & REF_NEEDS_COMMIT)) { | |
2480 | /* | |
2481 | * We didn't call write_ref_to_lockfile(), so | |
2482 | * the lockfile is still open. Close it to | |
2483 | * free up the file descriptor: | |
2484 | */ | |
83a3069a | 2485 | if (close_ref_gently(lock)) { |
165056b2 MH |
2486 | strbuf_addf(err, "couldn't close '%s.lock'", |
2487 | update->refname); | |
851e1fbd MÅ |
2488 | ret = TRANSACTION_GENERIC_ERROR; |
2489 | goto out; | |
165056b2 MH |
2490 | } |
2491 | } | |
851e1fbd MÅ |
2492 | |
2493 | out: | |
2494 | strbuf_release(&referent); | |
2495 | return ret; | |
165056b2 MH |
2496 | } |
2497 | ||
dc39e099 MH |
2498 | struct files_transaction_backend_data { |
2499 | struct ref_transaction *packed_transaction; | |
2500 | int packed_refs_locked; | |
2501 | }; | |
2502 | ||
c0ca9357 MH |
2503 | /* |
2504 | * Unlock any references in `transaction` that are still locked, and | |
2505 | * mark the transaction closed. | |
2506 | */ | |
dc39e099 MH |
2507 | static void files_transaction_cleanup(struct files_ref_store *refs, |
2508 | struct ref_transaction *transaction) | |
c0ca9357 MH |
2509 | { |
2510 | size_t i; | |
dc39e099 MH |
2511 | struct files_transaction_backend_data *backend_data = |
2512 | transaction->backend_data; | |
2513 | struct strbuf err = STRBUF_INIT; | |
c0ca9357 MH |
2514 | |
2515 | for (i = 0; i < transaction->nr; i++) { | |
2516 | struct ref_update *update = transaction->updates[i]; | |
2517 | struct ref_lock *lock = update->backend_data; | |
2518 | ||
2519 | if (lock) { | |
2520 | unlock_ref(lock); | |
2521 | update->backend_data = NULL; | |
2522 | } | |
2523 | } | |
2524 | ||
dc39e099 MH |
2525 | if (backend_data->packed_transaction && |
2526 | ref_transaction_abort(backend_data->packed_transaction, &err)) { | |
2527 | error("error aborting transaction: %s", err.buf); | |
2528 | strbuf_release(&err); | |
2529 | } | |
2530 | ||
2531 | if (backend_data->packed_refs_locked) | |
2532 | packed_refs_unlock(refs->packed_ref_store); | |
2533 | ||
2534 | free(backend_data); | |
2535 | ||
c0ca9357 MH |
2536 | transaction->state = REF_TRANSACTION_CLOSED; |
2537 | } | |
2538 | ||
30173b88 MH |
2539 | static int files_transaction_prepare(struct ref_store *ref_store, |
2540 | struct ref_transaction *transaction, | |
2541 | struct strbuf *err) | |
7bd9bcf3 | 2542 | { |
00eebe35 | 2543 | struct files_ref_store *refs = |
9e7ec634 | 2544 | files_downcast(ref_store, REF_STORE_WRITE, |
30173b88 | 2545 | "ref_transaction_prepare"); |
43a2dfde MH |
2546 | size_t i; |
2547 | int ret = 0; | |
7bd9bcf3 | 2548 | struct string_list affected_refnames = STRING_LIST_INIT_NODUP; |
92b1551b MH |
2549 | char *head_ref = NULL; |
2550 | int head_type; | |
dc39e099 MH |
2551 | struct files_transaction_backend_data *backend_data; |
2552 | struct ref_transaction *packed_transaction = NULL; | |
7bd9bcf3 MH |
2553 | |
2554 | assert(err); | |
2555 | ||
c0ca9357 MH |
2556 | if (!transaction->nr) |
2557 | goto cleanup; | |
7bd9bcf3 | 2558 | |
dc39e099 MH |
2559 | backend_data = xcalloc(1, sizeof(*backend_data)); |
2560 | transaction->backend_data = backend_data; | |
2561 | ||
92b1551b MH |
2562 | /* |
2563 | * Fail if a refname appears more than once in the | |
2564 | * transaction. (If we end up splitting up any updates using | |
2565 | * split_symref_update() or split_head_update(), those | |
2566 | * functions will check that the new updates don't have the | |
62c72d1f | 2567 | * same refname as any existing ones.) Also fail if any of the |
acedcde7 | 2568 | * updates use REF_IS_PRUNING without REF_NO_DEREF. |
92b1551b MH |
2569 | */ |
2570 | for (i = 0; i < transaction->nr; i++) { | |
2571 | struct ref_update *update = transaction->updates[i]; | |
2572 | struct string_list_item *item = | |
2573 | string_list_append(&affected_refnames, update->refname); | |
2574 | ||
acedcde7 | 2575 | if ((update->flags & REF_IS_PRUNING) && |
91774afc | 2576 | !(update->flags & REF_NO_DEREF)) |
acedcde7 | 2577 | BUG("REF_IS_PRUNING set without REF_NO_DEREF"); |
62c72d1f | 2578 | |
92b1551b MH |
2579 | /* |
2580 | * We store a pointer to update in item->util, but at | |
2581 | * the moment we never use the value of this field | |
2582 | * except to check whether it is non-NULL. | |
2583 | */ | |
2584 | item->util = update; | |
2585 | } | |
7bd9bcf3 MH |
2586 | string_list_sort(&affected_refnames); |
2587 | if (ref_update_reject_duplicates(&affected_refnames, err)) { | |
2588 | ret = TRANSACTION_GENERIC_ERROR; | |
2589 | goto cleanup; | |
2590 | } | |
2591 | ||
92b1551b MH |
2592 | /* |
2593 | * Special hack: If a branch is updated directly and HEAD | |
2594 | * points to it (may happen on the remote side of a push | |
2595 | * for example) then logically the HEAD reflog should be | |
2596 | * updated too. | |
2597 | * | |
2598 | * A generic solution would require reverse symref lookups, | |
2599 | * but finding all symrefs pointing to a given branch would be | |
2600 | * rather costly for this rare event (the direct update of a | |
2601 | * branch) to be worth it. So let's cheat and check with HEAD | |
2602 | * only, which should cover 99% of all usage scenarios (even | |
2603 | * 100% of the default ones). | |
2604 | * | |
2605 | * So if HEAD is a symbolic reference, then record the name of | |
2606 | * the reference that it points to. If we see an update of | |
2607 | * head_ref within the transaction, then split_head_update() | |
2608 | * arranges for the reflog of HEAD to be updated, too. | |
2609 | */ | |
2f40e954 NTND |
2610 | head_ref = refs_resolve_refdup(ref_store, "HEAD", |
2611 | RESOLVE_REF_NO_RECURSE, | |
872ccb2c | 2612 | NULL, &head_type); |
92b1551b MH |
2613 | |
2614 | if (head_ref && !(head_type & REF_ISSYMREF)) { | |
6a83d902 | 2615 | FREE_AND_NULL(head_ref); |
92b1551b MH |
2616 | } |
2617 | ||
7bd9bcf3 MH |
2618 | /* |
2619 | * Acquire all locks, verify old values if provided, check | |
2620 | * that new values are valid, and write new values to the | |
2621 | * lockfiles, ready to be activated. Only keep one lockfile | |
2622 | * open at a time to avoid running out of file descriptors. | |
30173b88 MH |
2623 | * Note that lock_ref_for_update() might append more updates |
2624 | * to the transaction. | |
7bd9bcf3 | 2625 | */ |
efe47281 MH |
2626 | for (i = 0; i < transaction->nr; i++) { |
2627 | struct ref_update *update = transaction->updates[i]; | |
7bd9bcf3 | 2628 | |
b3bbbc5c MH |
2629 | ret = lock_ref_for_update(refs, update, transaction, |
2630 | head_ref, &affected_refnames, err); | |
165056b2 | 2631 | if (ret) |
da5267f1 | 2632 | goto cleanup; |
dc39e099 MH |
2633 | |
2634 | if (update->flags & REF_DELETING && | |
2635 | !(update->flags & REF_LOG_ONLY) && | |
acedcde7 | 2636 | !(update->flags & REF_IS_PRUNING)) { |
dc39e099 MH |
2637 | /* |
2638 | * This reference has to be deleted from | |
2639 | * packed-refs if it exists there. | |
2640 | */ | |
2641 | if (!packed_transaction) { | |
2642 | packed_transaction = ref_store_transaction_begin( | |
2643 | refs->packed_ref_store, err); | |
2644 | if (!packed_transaction) { | |
2645 | ret = TRANSACTION_GENERIC_ERROR; | |
2646 | goto cleanup; | |
2647 | } | |
2648 | ||
2649 | backend_data->packed_transaction = | |
2650 | packed_transaction; | |
2651 | } | |
2652 | ||
2653 | ref_transaction_add_update( | |
2654 | packed_transaction, update->refname, | |
91774afc | 2655 | REF_HAVE_NEW | REF_NO_DEREF, |
b0ca4110 | 2656 | &update->new_oid, NULL, |
dc39e099 MH |
2657 | NULL); |
2658 | } | |
2659 | } | |
2660 | ||
2661 | if (packed_transaction) { | |
2662 | if (packed_refs_lock(refs->packed_ref_store, 0, err)) { | |
2663 | ret = TRANSACTION_GENERIC_ERROR; | |
2664 | goto cleanup; | |
2665 | } | |
2666 | backend_data->packed_refs_locked = 1; | |
7c6bd25c MH |
2667 | |
2668 | if (is_packed_transaction_needed(refs->packed_ref_store, | |
2669 | packed_transaction)) { | |
2670 | ret = ref_transaction_prepare(packed_transaction, err); | |
2671 | } else { | |
2672 | /* | |
2673 | * We can skip rewriting the `packed-refs` | |
2674 | * file. But we do need to leave it locked, so | |
2675 | * that somebody else doesn't pack a reference | |
2676 | * that we are trying to delete. | |
2677 | */ | |
2678 | if (ref_transaction_abort(packed_transaction, err)) { | |
2679 | ret = TRANSACTION_GENERIC_ERROR; | |
2680 | goto cleanup; | |
2681 | } | |
2682 | backend_data->packed_transaction = NULL; | |
2683 | } | |
30173b88 MH |
2684 | } |
2685 | ||
2686 | cleanup: | |
2687 | free(head_ref); | |
2688 | string_list_clear(&affected_refnames, 0); | |
2689 | ||
2690 | if (ret) | |
dc39e099 | 2691 | files_transaction_cleanup(refs, transaction); |
30173b88 MH |
2692 | else |
2693 | transaction->state = REF_TRANSACTION_PREPARED; | |
2694 | ||
2695 | return ret; | |
2696 | } | |
2697 | ||
2698 | static int files_transaction_finish(struct ref_store *ref_store, | |
2699 | struct ref_transaction *transaction, | |
2700 | struct strbuf *err) | |
2701 | { | |
2702 | struct files_ref_store *refs = | |
2703 | files_downcast(ref_store, 0, "ref_transaction_finish"); | |
2704 | size_t i; | |
2705 | int ret = 0; | |
30173b88 | 2706 | struct strbuf sb = STRBUF_INIT; |
dc39e099 MH |
2707 | struct files_transaction_backend_data *backend_data; |
2708 | struct ref_transaction *packed_transaction; | |
2709 | ||
30173b88 MH |
2710 | |
2711 | assert(err); | |
2712 | ||
2713 | if (!transaction->nr) { | |
2714 | transaction->state = REF_TRANSACTION_CLOSED; | |
2715 | return 0; | |
7bd9bcf3 | 2716 | } |
7bd9bcf3 | 2717 | |
dc39e099 MH |
2718 | backend_data = transaction->backend_data; |
2719 | packed_transaction = backend_data->packed_transaction; | |
2720 | ||
7bd9bcf3 | 2721 | /* Perform updates first so live commits remain referenced */ |
efe47281 MH |
2722 | for (i = 0; i < transaction->nr; i++) { |
2723 | struct ref_update *update = transaction->updates[i]; | |
7d618264 | 2724 | struct ref_lock *lock = update->backend_data; |
7bd9bcf3 | 2725 | |
d99aa884 DT |
2726 | if (update->flags & REF_NEEDS_COMMIT || |
2727 | update->flags & REF_LOG_ONLY) { | |
802de3da NTND |
2728 | if (files_log_ref_write(refs, |
2729 | lock->ref_name, | |
4417df8c | 2730 | &lock->old_oid, |
2731 | &update->new_oid, | |
81b1b6d4 MH |
2732 | update->msg, update->flags, |
2733 | err)) { | |
92b1551b MH |
2734 | char *old_msg = strbuf_detach(err, NULL); |
2735 | ||
2736 | strbuf_addf(err, "cannot update the ref '%s': %s", | |
2737 | lock->ref_name, old_msg); | |
2738 | free(old_msg); | |
2739 | unlock_ref(lock); | |
7d618264 | 2740 | update->backend_data = NULL; |
7bd9bcf3 MH |
2741 | ret = TRANSACTION_GENERIC_ERROR; |
2742 | goto cleanup; | |
7bd9bcf3 MH |
2743 | } |
2744 | } | |
7bd9bcf3 | 2745 | if (update->flags & REF_NEEDS_COMMIT) { |
00eebe35 | 2746 | clear_loose_ref_cache(refs); |
92b1551b MH |
2747 | if (commit_ref(lock)) { |
2748 | strbuf_addf(err, "couldn't set '%s'", lock->ref_name); | |
2749 | unlock_ref(lock); | |
7d618264 | 2750 | update->backend_data = NULL; |
7bd9bcf3 MH |
2751 | ret = TRANSACTION_GENERIC_ERROR; |
2752 | goto cleanup; | |
7bd9bcf3 MH |
2753 | } |
2754 | } | |
2755 | } | |
dc39e099 | 2756 | |
5e00a6c8 MH |
2757 | /* |
2758 | * Now that updates are safely completed, we can perform | |
2759 | * deletes. First delete the reflogs of any references that | |
2760 | * will be deleted, since (in the unexpected event of an | |
2761 | * error) leaving a reference without a reflog is less bad | |
2762 | * than leaving a reflog without a reference (the latter is a | |
2763 | * mildly invalid repository state): | |
2764 | */ | |
2765 | for (i = 0; i < transaction->nr; i++) { | |
2766 | struct ref_update *update = transaction->updates[i]; | |
2767 | if (update->flags & REF_DELETING && | |
2768 | !(update->flags & REF_LOG_ONLY) && | |
acedcde7 | 2769 | !(update->flags & REF_IS_PRUNING)) { |
5e00a6c8 MH |
2770 | strbuf_reset(&sb); |
2771 | files_reflog_path(refs, &sb, update->refname); | |
2772 | if (!unlink_or_warn(sb.buf)) | |
2773 | try_remove_empty_parents(refs, update->refname, | |
2774 | REMOVE_EMPTY_PARENTS_REFLOG); | |
2775 | } | |
2776 | } | |
2777 | ||
dc39e099 MH |
2778 | /* |
2779 | * Perform deletes now that updates are safely completed. | |
2780 | * | |
2781 | * First delete any packed versions of the references, while | |
2782 | * retaining the packed-refs lock: | |
2783 | */ | |
2784 | if (packed_transaction) { | |
2785 | ret = ref_transaction_commit(packed_transaction, err); | |
2786 | ref_transaction_free(packed_transaction); | |
2787 | packed_transaction = NULL; | |
2788 | backend_data->packed_transaction = NULL; | |
2789 | if (ret) | |
2790 | goto cleanup; | |
2791 | } | |
2792 | ||
2793 | /* Now delete the loose versions of the references: */ | |
efe47281 MH |
2794 | for (i = 0; i < transaction->nr; i++) { |
2795 | struct ref_update *update = transaction->updates[i]; | |
7d618264 | 2796 | struct ref_lock *lock = update->backend_data; |
7bd9bcf3 | 2797 | |
d99aa884 DT |
2798 | if (update->flags & REF_DELETING && |
2799 | !(update->flags & REF_LOG_ONLY)) { | |
ce0af24d MH |
2800 | if (!(update->type & REF_ISPACKED) || |
2801 | update->type & REF_ISSYMREF) { | |
2802 | /* It is a loose reference. */ | |
e9dcc305 | 2803 | strbuf_reset(&sb); |
19e02f4f | 2804 | files_ref_path(refs, &sb, lock->ref_name); |
e9dcc305 | 2805 | if (unlink_or_msg(sb.buf, err)) { |
ce0af24d MH |
2806 | ret = TRANSACTION_GENERIC_ERROR; |
2807 | goto cleanup; | |
2808 | } | |
44639777 | 2809 | update->flags |= REF_DELETED_LOOSE; |
7bd9bcf3 | 2810 | } |
7bd9bcf3 MH |
2811 | } |
2812 | } | |
2813 | ||
00eebe35 | 2814 | clear_loose_ref_cache(refs); |
7bd9bcf3 MH |
2815 | |
2816 | cleanup: | |
dc39e099 | 2817 | files_transaction_cleanup(refs, transaction); |
7bd9bcf3 | 2818 | |
44639777 MH |
2819 | for (i = 0; i < transaction->nr; i++) { |
2820 | struct ref_update *update = transaction->updates[i]; | |
44639777 MH |
2821 | |
2822 | if (update->flags & REF_DELETED_LOOSE) { | |
2823 | /* | |
2824 | * The loose reference was deleted. Delete any | |
2825 | * empty parent directories. (Note that this | |
2826 | * can only work because we have already | |
2827 | * removed the lockfile.) | |
2828 | */ | |
802de3da | 2829 | try_remove_empty_parents(refs, update->refname, |
44639777 MH |
2830 | REMOVE_EMPTY_PARENTS_REF); |
2831 | } | |
2832 | } | |
2833 | ||
30173b88 | 2834 | strbuf_release(&sb); |
7bd9bcf3 MH |
2835 | return ret; |
2836 | } | |
2837 | ||
30173b88 MH |
2838 | static int files_transaction_abort(struct ref_store *ref_store, |
2839 | struct ref_transaction *transaction, | |
2840 | struct strbuf *err) | |
2841 | { | |
dc39e099 MH |
2842 | struct files_ref_store *refs = |
2843 | files_downcast(ref_store, 0, "ref_transaction_abort"); | |
2844 | ||
2845 | files_transaction_cleanup(refs, transaction); | |
30173b88 MH |
2846 | return 0; |
2847 | } | |
2848 | ||
7bd9bcf3 MH |
2849 | static int ref_present(const char *refname, |
2850 | const struct object_id *oid, int flags, void *cb_data) | |
2851 | { | |
2852 | struct string_list *affected_refnames = cb_data; | |
2853 | ||
2854 | return string_list_has_string(affected_refnames, refname); | |
2855 | } | |
2856 | ||
fc681463 DT |
2857 | static int files_initial_transaction_commit(struct ref_store *ref_store, |
2858 | struct ref_transaction *transaction, | |
2859 | struct strbuf *err) | |
7bd9bcf3 | 2860 | { |
d99825ab | 2861 | struct files_ref_store *refs = |
9e7ec634 NTND |
2862 | files_downcast(ref_store, REF_STORE_WRITE, |
2863 | "initial_ref_transaction_commit"); | |
43a2dfde MH |
2864 | size_t i; |
2865 | int ret = 0; | |
7bd9bcf3 | 2866 | struct string_list affected_refnames = STRING_LIST_INIT_NODUP; |
1444bfe0 | 2867 | struct ref_transaction *packed_transaction = NULL; |
7bd9bcf3 MH |
2868 | |
2869 | assert(err); | |
2870 | ||
2871 | if (transaction->state != REF_TRANSACTION_OPEN) | |
033abf97 | 2872 | BUG("commit called for transaction that is not open"); |
7bd9bcf3 MH |
2873 | |
2874 | /* Fail if a refname appears more than once in the transaction: */ | |
efe47281 MH |
2875 | for (i = 0; i < transaction->nr; i++) |
2876 | string_list_append(&affected_refnames, | |
2877 | transaction->updates[i]->refname); | |
7bd9bcf3 MH |
2878 | string_list_sort(&affected_refnames); |
2879 | if (ref_update_reject_duplicates(&affected_refnames, err)) { | |
2880 | ret = TRANSACTION_GENERIC_ERROR; | |
2881 | goto cleanup; | |
2882 | } | |
2883 | ||
2884 | /* | |
2885 | * It's really undefined to call this function in an active | |
2886 | * repository or when there are existing references: we are | |
2887 | * only locking and changing packed-refs, so (1) any | |
2888 | * simultaneous processes might try to change a reference at | |
2889 | * the same time we do, and (2) any existing loose versions of | |
2890 | * the references that we are setting would have precedence | |
2891 | * over our values. But some remote helpers create the remote | |
2892 | * "HEAD" and "master" branches before calling this function, | |
2893 | * so here we really only check that none of the references | |
2894 | * that we are creating already exists. | |
2895 | */ | |
2f40e954 NTND |
2896 | if (refs_for_each_rawref(&refs->base, ref_present, |
2897 | &affected_refnames)) | |
033abf97 | 2898 | BUG("initial ref transaction called with existing refs"); |
7bd9bcf3 | 2899 | |
1444bfe0 MH |
2900 | packed_transaction = ref_store_transaction_begin(refs->packed_ref_store, err); |
2901 | if (!packed_transaction) { | |
2902 | ret = TRANSACTION_GENERIC_ERROR; | |
2903 | goto cleanup; | |
2904 | } | |
2905 | ||
efe47281 MH |
2906 | for (i = 0; i < transaction->nr; i++) { |
2907 | struct ref_update *update = transaction->updates[i]; | |
7bd9bcf3 MH |
2908 | |
2909 | if ((update->flags & REF_HAVE_OLD) && | |
98491298 | 2910 | !is_null_oid(&update->old_oid)) |
033abf97 | 2911 | BUG("initial ref transaction with old_sha1 set"); |
7d2df051 NTND |
2912 | if (refs_verify_refname_available(&refs->base, update->refname, |
2913 | &affected_refnames, NULL, | |
2914 | err)) { | |
7bd9bcf3 MH |
2915 | ret = TRANSACTION_NAME_CONFLICT; |
2916 | goto cleanup; | |
2917 | } | |
1444bfe0 MH |
2918 | |
2919 | /* | |
2920 | * Add a reference creation for this reference to the | |
2921 | * packed-refs transaction: | |
2922 | */ | |
2923 | ref_transaction_add_update(packed_transaction, update->refname, | |
2924 | update->flags & ~REF_HAVE_OLD, | |
89f3bbdd | 2925 | &update->new_oid, &update->old_oid, |
1444bfe0 | 2926 | NULL); |
7bd9bcf3 MH |
2927 | } |
2928 | ||
c8bed835 | 2929 | if (packed_refs_lock(refs->packed_ref_store, 0, err)) { |
7bd9bcf3 MH |
2930 | ret = TRANSACTION_GENERIC_ERROR; |
2931 | goto cleanup; | |
2932 | } | |
2933 | ||
1444bfe0 | 2934 | if (initial_ref_transaction_commit(packed_transaction, err)) { |
7bd9bcf3 | 2935 | ret = TRANSACTION_GENERIC_ERROR; |
7bd9bcf3 MH |
2936 | } |
2937 | ||
81fcb698 | 2938 | packed_refs_unlock(refs->packed_ref_store); |
7bd9bcf3 | 2939 | cleanup: |
1444bfe0 MH |
2940 | if (packed_transaction) |
2941 | ref_transaction_free(packed_transaction); | |
7bd9bcf3 MH |
2942 | transaction->state = REF_TRANSACTION_CLOSED; |
2943 | string_list_clear(&affected_refnames, 0); | |
2944 | return ret; | |
2945 | } | |
2946 | ||
2947 | struct expire_reflog_cb { | |
2948 | unsigned int flags; | |
2949 | reflog_expiry_should_prune_fn *should_prune_fn; | |
2950 | void *policy_cb; | |
2951 | FILE *newlog; | |
9461d272 | 2952 | struct object_id last_kept_oid; |
7bd9bcf3 MH |
2953 | }; |
2954 | ||
9461d272 | 2955 | static int expire_reflog_ent(struct object_id *ooid, struct object_id *noid, |
dddbad72 | 2956 | const char *email, timestamp_t timestamp, int tz, |
7bd9bcf3 MH |
2957 | const char *message, void *cb_data) |
2958 | { | |
2959 | struct expire_reflog_cb *cb = cb_data; | |
2960 | struct expire_reflog_policy_cb *policy_cb = cb->policy_cb; | |
2961 | ||
2962 | if (cb->flags & EXPIRE_REFLOGS_REWRITE) | |
9461d272 | 2963 | ooid = &cb->last_kept_oid; |
7bd9bcf3 | 2964 | |
4322478a | 2965 | if ((*cb->should_prune_fn)(ooid, noid, email, timestamp, tz, |
7bd9bcf3 MH |
2966 | message, policy_cb)) { |
2967 | if (!cb->newlog) | |
2968 | printf("would prune %s", message); | |
2969 | else if (cb->flags & EXPIRE_REFLOGS_VERBOSE) | |
2970 | printf("prune %s", message); | |
2971 | } else { | |
2972 | if (cb->newlog) { | |
cb71f8bd | 2973 | fprintf(cb->newlog, "%s %s %s %"PRItime" %+05d\t%s", |
9461d272 | 2974 | oid_to_hex(ooid), oid_to_hex(noid), |
7bd9bcf3 | 2975 | email, timestamp, tz, message); |
9461d272 | 2976 | oidcpy(&cb->last_kept_oid, noid); |
7bd9bcf3 MH |
2977 | } |
2978 | if (cb->flags & EXPIRE_REFLOGS_VERBOSE) | |
2979 | printf("keep %s", message); | |
2980 | } | |
2981 | return 0; | |
2982 | } | |
2983 | ||
e3688bd6 | 2984 | static int files_reflog_expire(struct ref_store *ref_store, |
0155f710 | 2985 | const char *refname, const struct object_id *oid, |
e3688bd6 DT |
2986 | unsigned int flags, |
2987 | reflog_expiry_prepare_fn prepare_fn, | |
2988 | reflog_expiry_should_prune_fn should_prune_fn, | |
2989 | reflog_expiry_cleanup_fn cleanup_fn, | |
2990 | void *policy_cb_data) | |
7bd9bcf3 | 2991 | { |
7eb27cdf | 2992 | struct files_ref_store *refs = |
9e7ec634 | 2993 | files_downcast(ref_store, REF_STORE_WRITE, "reflog_expire"); |
b2275868 | 2994 | struct lock_file reflog_lock = LOCK_INIT; |
7bd9bcf3 MH |
2995 | struct expire_reflog_cb cb; |
2996 | struct ref_lock *lock; | |
802de3da | 2997 | struct strbuf log_file_sb = STRBUF_INIT; |
7bd9bcf3 MH |
2998 | char *log_file; |
2999 | int status = 0; | |
3000 | int type; | |
3001 | struct strbuf err = STRBUF_INIT; | |
3002 | ||
3003 | memset(&cb, 0, sizeof(cb)); | |
3004 | cb.flags = flags; | |
3005 | cb.policy_cb = policy_cb_data; | |
3006 | cb.should_prune_fn = should_prune_fn; | |
3007 | ||
3008 | /* | |
3009 | * The reflog file is locked by holding the lock on the | |
3010 | * reference itself, plus we might need to update the | |
3011 | * reference if --updateref was specified: | |
3012 | */ | |
4f01e508 | 3013 | lock = lock_ref_oid_basic(refs, refname, oid, |
91774afc | 3014 | NULL, NULL, REF_NO_DEREF, |
4f01e508 | 3015 | &type, &err); |
7bd9bcf3 MH |
3016 | if (!lock) { |
3017 | error("cannot lock ref '%s': %s", refname, err.buf); | |
3018 | strbuf_release(&err); | |
3019 | return -1; | |
3020 | } | |
2f40e954 | 3021 | if (!refs_reflog_exists(ref_store, refname)) { |
7bd9bcf3 MH |
3022 | unlock_ref(lock); |
3023 | return 0; | |
3024 | } | |
3025 | ||
802de3da NTND |
3026 | files_reflog_path(refs, &log_file_sb, refname); |
3027 | log_file = strbuf_detach(&log_file_sb, NULL); | |
7bd9bcf3 MH |
3028 | if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) { |
3029 | /* | |
3030 | * Even though holding $GIT_DIR/logs/$reflog.lock has | |
3031 | * no locking implications, we use the lock_file | |
3032 | * machinery here anyway because it does a lot of the | |
3033 | * work we need, including cleaning up if the program | |
3034 | * exits unexpectedly. | |
3035 | */ | |
3036 | if (hold_lock_file_for_update(&reflog_lock, log_file, 0) < 0) { | |
3037 | struct strbuf err = STRBUF_INIT; | |
3038 | unable_to_lock_message(log_file, errno, &err); | |
3039 | error("%s", err.buf); | |
3040 | strbuf_release(&err); | |
3041 | goto failure; | |
3042 | } | |
3043 | cb.newlog = fdopen_lock_file(&reflog_lock, "w"); | |
3044 | if (!cb.newlog) { | |
3045 | error("cannot fdopen %s (%s)", | |
3046 | get_lock_file_path(&reflog_lock), strerror(errno)); | |
3047 | goto failure; | |
3048 | } | |
3049 | } | |
3050 | ||
0155f710 | 3051 | (*prepare_fn)(refname, oid, cb.policy_cb); |
2f40e954 | 3052 | refs_for_each_reflog_ent(ref_store, refname, expire_reflog_ent, &cb); |
7bd9bcf3 MH |
3053 | (*cleanup_fn)(cb.policy_cb); |
3054 | ||
3055 | if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) { | |
3056 | /* | |
3057 | * It doesn't make sense to adjust a reference pointed | |
3058 | * to by a symbolic ref based on expiring entries in | |
3059 | * the symbolic reference's reflog. Nor can we update | |
3060 | * a reference if there are no remaining reflog | |
3061 | * entries. | |
3062 | */ | |
3063 | int update = (flags & EXPIRE_REFLOGS_UPDATE_REF) && | |
3064 | !(type & REF_ISSYMREF) && | |
9461d272 | 3065 | !is_null_oid(&cb.last_kept_oid); |
7bd9bcf3 | 3066 | |
83a3069a | 3067 | if (close_lock_file_gently(&reflog_lock)) { |
7bd9bcf3 MH |
3068 | status |= error("couldn't write %s: %s", log_file, |
3069 | strerror(errno)); | |
83a3069a | 3070 | rollback_lock_file(&reflog_lock); |
7bd9bcf3 | 3071 | } else if (update && |
ee4d8e45 | 3072 | (write_in_full(get_lock_file_fd(&lock->lk), |
06f46f23 | 3073 | oid_to_hex(&cb.last_kept_oid), GIT_SHA1_HEXSZ) < 0 || |
88780c37 | 3074 | write_str_in_full(get_lock_file_fd(&lock->lk), "\n") < 0 || |
83a3069a | 3075 | close_ref_gently(lock) < 0)) { |
7bd9bcf3 | 3076 | status |= error("couldn't write %s", |
ee4d8e45 | 3077 | get_lock_file_path(&lock->lk)); |
7bd9bcf3 MH |
3078 | rollback_lock_file(&reflog_lock); |
3079 | } else if (commit_lock_file(&reflog_lock)) { | |
e0048d3e | 3080 | status |= error("unable to write reflog '%s' (%s)", |
7bd9bcf3 MH |
3081 | log_file, strerror(errno)); |
3082 | } else if (update && commit_ref(lock)) { | |
3083 | status |= error("couldn't set %s", lock->ref_name); | |
3084 | } | |
3085 | } | |
3086 | free(log_file); | |
3087 | unlock_ref(lock); | |
3088 | return status; | |
3089 | ||
3090 | failure: | |
3091 | rollback_lock_file(&reflog_lock); | |
3092 | free(log_file); | |
3093 | unlock_ref(lock); | |
3094 | return -1; | |
3095 | } | |
3dce444f | 3096 | |
6fb5acfd DT |
3097 | static int files_init_db(struct ref_store *ref_store, struct strbuf *err) |
3098 | { | |
19e02f4f | 3099 | struct files_ref_store *refs = |
9e7ec634 | 3100 | files_downcast(ref_store, REF_STORE_WRITE, "init_db"); |
e9dcc305 NTND |
3101 | struct strbuf sb = STRBUF_INIT; |
3102 | ||
6fb5acfd DT |
3103 | /* |
3104 | * Create .git/refs/{heads,tags} | |
3105 | */ | |
19e02f4f | 3106 | files_ref_path(refs, &sb, "refs/heads"); |
e9dcc305 NTND |
3107 | safe_create_dir(sb.buf, 1); |
3108 | ||
3109 | strbuf_reset(&sb); | |
19e02f4f | 3110 | files_ref_path(refs, &sb, "refs/tags"); |
e9dcc305 NTND |
3111 | safe_create_dir(sb.buf, 1); |
3112 | ||
3113 | strbuf_release(&sb); | |
6fb5acfd DT |
3114 | return 0; |
3115 | } | |
3116 | ||
3dce444f RS |
3117 | struct ref_storage_be refs_be_files = { |
3118 | NULL, | |
00eebe35 | 3119 | "files", |
127b42a1 | 3120 | files_ref_store_create, |
6fb5acfd | 3121 | files_init_db, |
30173b88 MH |
3122 | files_transaction_prepare, |
3123 | files_transaction_finish, | |
3124 | files_transaction_abort, | |
fc681463 | 3125 | files_initial_transaction_commit, |
e1e33b72 | 3126 | |
8231527e | 3127 | files_pack_refs, |
284689ba | 3128 | files_create_symref, |
a27dcf89 | 3129 | files_delete_refs, |
9b6b40d9 | 3130 | files_rename_ref, |
52d59cc6 | 3131 | files_copy_ref, |
8231527e | 3132 | |
1a769003 | 3133 | files_ref_iterator_begin, |
62665823 | 3134 | files_read_raw_ref, |
e3688bd6 DT |
3135 | |
3136 | files_reflog_iterator_begin, | |
3137 | files_for_each_reflog_ent, | |
3138 | files_for_each_reflog_ent_reverse, | |
3139 | files_reflog_exists, | |
3140 | files_create_reflog, | |
3141 | files_delete_reflog, | |
3142 | files_reflog_expire | |
3dce444f | 3143 | }; |