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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" |
3a3b9d8c | 13 | #include "worktree.h" |
7bd9bcf3 | 14 | |
5ac95fee MH |
15 | /* |
16 | * This backend uses the following flags in `ref_update::flags` for | |
17 | * internal bookkeeping purposes. Their numerical values must not | |
91774afc | 18 | * conflict with REF_NO_DEREF, REF_FORCE_CREATE_REFLOG, REF_HAVE_NEW, |
acedcde7 | 19 | * REF_HAVE_OLD, or REF_IS_PRUNING, which are also stored in |
5ac95fee MH |
20 | * `ref_update::flags`. |
21 | */ | |
22 | ||
23 | /* | |
24 | * Used as a flag in ref_update::flags when a loose ref is being | |
91774afc | 25 | * pruned. This flag must only be used when REF_NO_DEREF is set. |
5ac95fee | 26 | */ |
acedcde7 | 27 | #define REF_IS_PRUNING (1 << 4) |
5ac95fee MH |
28 | |
29 | /* | |
30 | * Flag passed to lock_ref_sha1_basic() telling it to tolerate broken | |
31 | * refs (i.e., because the reference is about to be deleted anyway). | |
32 | */ | |
33 | #define REF_DELETING (1 << 5) | |
34 | ||
35 | /* | |
36 | * Used as a flag in ref_update::flags when the lockfile needs to be | |
37 | * committed. | |
38 | */ | |
39 | #define REF_NEEDS_COMMIT (1 << 6) | |
40 | ||
41 | /* | |
42 | * Used as a flag in ref_update::flags when we want to log a ref | |
43 | * update but not actually perform it. This is used when a symbolic | |
44 | * ref update is split up. | |
45 | */ | |
46 | #define REF_LOG_ONLY (1 << 7) | |
47 | ||
48 | /* | |
49 | * Used as a flag in ref_update::flags when the ref_update was via an | |
50 | * update to HEAD. | |
51 | */ | |
52 | #define REF_UPDATE_VIA_HEAD (1 << 8) | |
53 | ||
54 | /* | |
55 | * Used as a flag in ref_update::flags when the loose reference has | |
56 | * been deleted. | |
57 | */ | |
58 | #define REF_DELETED_LOOSE (1 << 9) | |
59 | ||
7bd9bcf3 MH |
60 | struct ref_lock { |
61 | char *ref_name; | |
ee4d8e45 | 62 | struct lock_file lk; |
7bd9bcf3 MH |
63 | struct object_id old_oid; |
64 | }; | |
65 | ||
00eebe35 MH |
66 | struct files_ref_store { |
67 | struct ref_store base; | |
9e7ec634 | 68 | unsigned int store_flags; |
32c597e7 | 69 | |
f57f37e2 NTND |
70 | char *gitdir; |
71 | char *gitcommondir; | |
33dfb9f3 | 72 | |
7c22bc8a | 73 | struct ref_cache *loose; |
55c6bc37 | 74 | |
e0cc8ac8 | 75 | struct ref_store *packed_ref_store; |
00eebe35 | 76 | }; |
7bd9bcf3 | 77 | |
65a0a8e5 | 78 | static void clear_loose_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 MH |
79 | { |
80 | if (refs->loose) { | |
7c22bc8a | 81 | free_ref_cache(refs->loose); |
7bd9bcf3 MH |
82 | refs->loose = NULL; |
83 | } | |
84 | } | |
85 | ||
a2d5156c JK |
86 | /* |
87 | * Create a new submodule ref cache and add it to the internal | |
88 | * set of caches. | |
89 | */ | |
9e7ec634 NTND |
90 | static struct ref_store *files_ref_store_create(const char *gitdir, |
91 | unsigned int flags) | |
7bd9bcf3 | 92 | { |
00eebe35 MH |
93 | struct files_ref_store *refs = xcalloc(1, sizeof(*refs)); |
94 | struct ref_store *ref_store = (struct ref_store *)refs; | |
f57f37e2 | 95 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 | 96 | |
fbfd0a29 | 97 | base_ref_store_init(ref_store, &refs_be_files); |
9e7ec634 | 98 | refs->store_flags = flags; |
7bd9bcf3 | 99 | |
f57f37e2 NTND |
100 | refs->gitdir = xstrdup(gitdir); |
101 | get_common_dir_noenv(&sb, gitdir); | |
102 | refs->gitcommondir = strbuf_detach(&sb, NULL); | |
103 | strbuf_addf(&sb, "%s/packed-refs", refs->gitcommondir); | |
e0d48397 MH |
104 | refs->packed_ref_store = packed_ref_store_create(sb.buf, flags); |
105 | strbuf_release(&sb); | |
7bd9bcf3 | 106 | |
fb9c2d27 JK |
107 | chdir_notify_reparent("files-backend $GIT_DIR", |
108 | &refs->gitdir); | |
109 | chdir_notify_reparent("files-backend $GIT_COMMONDIR", | |
110 | &refs->gitcommondir); | |
111 | ||
00eebe35 | 112 | return ref_store; |
a2d5156c | 113 | } |
7bd9bcf3 | 114 | |
32c597e7 | 115 | /* |
9e7ec634 NTND |
116 | * Die if refs is not the main ref store. caller is used in any |
117 | * necessary error messages. | |
32c597e7 MH |
118 | */ |
119 | static void files_assert_main_repository(struct files_ref_store *refs, | |
120 | const char *caller) | |
121 | { | |
9e7ec634 NTND |
122 | if (refs->store_flags & REF_STORE_MAIN) |
123 | return; | |
124 | ||
033abf97 | 125 | BUG("operation %s only allowed for main ref store", caller); |
32c597e7 MH |
126 | } |
127 | ||
a2d5156c | 128 | /* |
00eebe35 | 129 | * Downcast ref_store to files_ref_store. Die if ref_store is not a |
9e7ec634 NTND |
130 | * files_ref_store. required_flags is compared with ref_store's |
131 | * store_flags to ensure the ref_store has all required capabilities. | |
132 | * "caller" is used in any necessary error messages. | |
a2d5156c | 133 | */ |
9e7ec634 NTND |
134 | static struct files_ref_store *files_downcast(struct ref_store *ref_store, |
135 | unsigned int required_flags, | |
136 | const char *caller) | |
a2d5156c | 137 | { |
32c597e7 MH |
138 | struct files_ref_store *refs; |
139 | ||
00eebe35 | 140 | if (ref_store->be != &refs_be_files) |
033abf97 | 141 | BUG("ref_store is type \"%s\" not \"files\" in %s", |
00eebe35 | 142 | ref_store->be->name, caller); |
2eed2780 | 143 | |
32c597e7 MH |
144 | refs = (struct files_ref_store *)ref_store; |
145 | ||
9e7ec634 | 146 | if ((refs->store_flags & required_flags) != required_flags) |
033abf97 | 147 | BUG("operation %s requires abilities 0x%x, but only have 0x%x", |
9e7ec634 | 148 | caller, required_flags, refs->store_flags); |
2eed2780 | 149 | |
32c597e7 | 150 | return refs; |
7bd9bcf3 MH |
151 | } |
152 | ||
3a3b9d8c NTND |
153 | static void files_reflog_path_other_worktrees(struct files_ref_store *refs, |
154 | struct strbuf *sb, | |
155 | const char *refname) | |
156 | { | |
157 | const char *real_ref; | |
158 | const char *worktree_name; | |
159 | int length; | |
160 | ||
161 | if (parse_worktree_ref(refname, &worktree_name, &length, &real_ref)) | |
162 | BUG("refname %s is not a other-worktree ref", refname); | |
163 | ||
164 | if (worktree_name) | |
165 | strbuf_addf(sb, "%s/worktrees/%.*s/logs/%s", refs->gitcommondir, | |
166 | length, worktree_name, real_ref); | |
167 | else | |
168 | strbuf_addf(sb, "%s/logs/%s", refs->gitcommondir, | |
169 | real_ref); | |
170 | } | |
171 | ||
802de3da NTND |
172 | static void files_reflog_path(struct files_ref_store *refs, |
173 | struct strbuf *sb, | |
174 | const char *refname) | |
175 | { | |
f57f37e2 NTND |
176 | switch (ref_type(refname)) { |
177 | case REF_TYPE_PER_WORKTREE: | |
178 | case REF_TYPE_PSEUDOREF: | |
179 | strbuf_addf(sb, "%s/logs/%s", refs->gitdir, refname); | |
180 | break; | |
3a3b9d8c NTND |
181 | case REF_TYPE_OTHER_PSEUDOREF: |
182 | case REF_TYPE_MAIN_PSEUDOREF: | |
183 | return files_reflog_path_other_worktrees(refs, sb, refname); | |
f57f37e2 NTND |
184 | case REF_TYPE_NORMAL: |
185 | strbuf_addf(sb, "%s/logs/%s", refs->gitcommondir, refname); | |
186 | break; | |
187 | default: | |
033abf97 | 188 | BUG("unknown ref type %d of ref %s", |
f57f37e2 NTND |
189 | ref_type(refname), refname); |
190 | } | |
802de3da NTND |
191 | } |
192 | ||
19e02f4f NTND |
193 | static void files_ref_path(struct files_ref_store *refs, |
194 | struct strbuf *sb, | |
195 | const char *refname) | |
196 | { | |
f57f37e2 NTND |
197 | switch (ref_type(refname)) { |
198 | case REF_TYPE_PER_WORKTREE: | |
199 | case REF_TYPE_PSEUDOREF: | |
200 | strbuf_addf(sb, "%s/%s", refs->gitdir, refname); | |
201 | break; | |
3a3b9d8c NTND |
202 | case REF_TYPE_MAIN_PSEUDOREF: |
203 | if (!skip_prefix(refname, "main-worktree/", &refname)) | |
204 | BUG("ref %s is not a main pseudoref", refname); | |
205 | /* fallthrough */ | |
206 | case REF_TYPE_OTHER_PSEUDOREF: | |
f57f37e2 NTND |
207 | case REF_TYPE_NORMAL: |
208 | strbuf_addf(sb, "%s/%s", refs->gitcommondir, refname); | |
209 | break; | |
210 | default: | |
033abf97 | 211 | BUG("unknown ref type %d of ref %s", |
f57f37e2 NTND |
212 | ref_type(refname), refname); |
213 | } | |
19e02f4f NTND |
214 | } |
215 | ||
09e65645 | 216 | /* |
b9317d55 | 217 | * Manually add refs/bisect, refs/rewritten and refs/worktree, which, being |
09e65645 NTND |
218 | * per-worktree, might not appear in the directory listing for |
219 | * refs/ in the main repo. | |
220 | */ | |
221 | static void add_per_worktree_entries_to_dir(struct ref_dir *dir, const char *dirname) | |
222 | { | |
b9317d55 | 223 | const char *prefixes[] = { "refs/bisect/", "refs/worktree/", "refs/rewritten/" }; |
90d31ff5 | 224 | int ip; |
09e65645 NTND |
225 | |
226 | if (strcmp(dirname, "refs/")) | |
227 | return; | |
228 | ||
90d31ff5 NTND |
229 | for (ip = 0; ip < ARRAY_SIZE(prefixes); ip++) { |
230 | const char *prefix = prefixes[ip]; | |
231 | int prefix_len = strlen(prefix); | |
232 | struct ref_entry *child_entry; | |
233 | int pos; | |
09e65645 | 234 | |
90d31ff5 NTND |
235 | pos = search_ref_dir(dir, prefix, prefix_len); |
236 | if (pos >= 0) | |
237 | continue; | |
238 | child_entry = create_dir_entry(dir->cache, prefix, prefix_len, 1); | |
09e65645 NTND |
239 | add_entry_to_dir(dir, child_entry); |
240 | } | |
241 | } | |
242 | ||
7bd9bcf3 MH |
243 | /* |
244 | * Read the loose references from the namespace dirname into dir | |
245 | * (without recursing). dirname must end with '/'. dir must be the | |
246 | * directory entry corresponding to dirname. | |
247 | */ | |
df308759 MH |
248 | static void loose_fill_ref_dir(struct ref_store *ref_store, |
249 | struct ref_dir *dir, const char *dirname) | |
7bd9bcf3 | 250 | { |
df308759 MH |
251 | struct files_ref_store *refs = |
252 | files_downcast(ref_store, REF_STORE_READ, "fill_ref_dir"); | |
7bd9bcf3 MH |
253 | DIR *d; |
254 | struct dirent *de; | |
255 | int dirnamelen = strlen(dirname); | |
256 | struct strbuf refname; | |
257 | struct strbuf path = STRBUF_INIT; | |
258 | size_t path_baselen; | |
259 | ||
19e02f4f | 260 | files_ref_path(refs, &path, dirname); |
7bd9bcf3 MH |
261 | path_baselen = path.len; |
262 | ||
263 | d = opendir(path.buf); | |
264 | if (!d) { | |
265 | strbuf_release(&path); | |
266 | return; | |
267 | } | |
268 | ||
269 | strbuf_init(&refname, dirnamelen + 257); | |
270 | strbuf_add(&refname, dirname, dirnamelen); | |
271 | ||
272 | while ((de = readdir(d)) != NULL) { | |
4417df8c | 273 | struct object_id oid; |
7bd9bcf3 MH |
274 | struct stat st; |
275 | int flag; | |
276 | ||
277 | if (de->d_name[0] == '.') | |
278 | continue; | |
279 | if (ends_with(de->d_name, ".lock")) | |
280 | continue; | |
281 | strbuf_addstr(&refname, de->d_name); | |
282 | strbuf_addstr(&path, de->d_name); | |
283 | if (stat(path.buf, &st) < 0) { | |
284 | ; /* silently ignore */ | |
285 | } else if (S_ISDIR(st.st_mode)) { | |
286 | strbuf_addch(&refname, '/'); | |
287 | add_entry_to_dir(dir, | |
e00d1a4f | 288 | create_dir_entry(dir->cache, refname.buf, |
7bd9bcf3 MH |
289 | refname.len, 1)); |
290 | } else { | |
7d2df051 | 291 | if (!refs_resolve_ref_unsafe(&refs->base, |
3c0cb0cb MH |
292 | refname.buf, |
293 | RESOLVE_REF_READING, | |
49e61479 | 294 | &oid, &flag)) { |
4417df8c | 295 | oidclr(&oid); |
7bd9bcf3 | 296 | flag |= REF_ISBROKEN; |
4417df8c | 297 | } else if (is_null_oid(&oid)) { |
7bd9bcf3 MH |
298 | /* |
299 | * It is so astronomically unlikely | |
78fb4579 | 300 | * that null_oid is the OID of an |
7bd9bcf3 MH |
301 | * actual object that we consider its |
302 | * appearance in a loose reference | |
303 | * file to be repo corruption | |
304 | * (probably due to a software bug). | |
305 | */ | |
306 | flag |= REF_ISBROKEN; | |
307 | } | |
308 | ||
309 | if (check_refname_format(refname.buf, | |
310 | REFNAME_ALLOW_ONELEVEL)) { | |
311 | if (!refname_is_safe(refname.buf)) | |
312 | die("loose refname is dangerous: %s", refname.buf); | |
4417df8c | 313 | oidclr(&oid); |
7bd9bcf3 MH |
314 | flag |= REF_BAD_NAME | REF_ISBROKEN; |
315 | } | |
316 | add_entry_to_dir(dir, | |
c1da06c6 | 317 | create_ref_entry(refname.buf, &oid, flag)); |
7bd9bcf3 MH |
318 | } |
319 | strbuf_setlen(&refname, dirnamelen); | |
320 | strbuf_setlen(&path, path_baselen); | |
321 | } | |
322 | strbuf_release(&refname); | |
323 | strbuf_release(&path); | |
324 | closedir(d); | |
e3bf2989 | 325 | |
09e65645 | 326 | add_per_worktree_entries_to_dir(dir, dirname); |
7bd9bcf3 MH |
327 | } |
328 | ||
a714b19c | 329 | static struct ref_cache *get_loose_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 MH |
330 | { |
331 | if (!refs->loose) { | |
332 | /* | |
333 | * Mark the top-level directory complete because we | |
334 | * are about to read the only subdirectory that can | |
335 | * hold references: | |
336 | */ | |
df308759 | 337 | refs->loose = create_ref_cache(&refs->base, loose_fill_ref_dir); |
7c22bc8a MH |
338 | |
339 | /* We're going to fill the top level ourselves: */ | |
340 | refs->loose->root->flag &= ~REF_INCOMPLETE; | |
341 | ||
7bd9bcf3 | 342 | /* |
7c22bc8a MH |
343 | * Add an incomplete entry for "refs/" (to be filled |
344 | * lazily): | |
7bd9bcf3 | 345 | */ |
7c22bc8a | 346 | add_entry_to_dir(get_ref_dir(refs->loose->root), |
e00d1a4f | 347 | create_dir_entry(refs->loose, "refs/", 5, 1)); |
7bd9bcf3 | 348 | } |
a714b19c | 349 | return refs->loose; |
7bd9bcf3 MH |
350 | } |
351 | ||
e1e33b72 | 352 | static int files_read_raw_ref(struct ref_store *ref_store, |
99afe91a | 353 | const char *refname, struct object_id *oid, |
e1e33b72 | 354 | struct strbuf *referent, unsigned int *type) |
7bd9bcf3 | 355 | { |
4308651c | 356 | struct files_ref_store *refs = |
9e7ec634 | 357 | files_downcast(ref_store, REF_STORE_READ, "read_raw_ref"); |
42a38cf7 MH |
358 | struct strbuf sb_contents = STRBUF_INIT; |
359 | struct strbuf sb_path = STRBUF_INIT; | |
7048653a DT |
360 | const char *path; |
361 | const char *buf; | |
99afe91a | 362 | const char *p; |
7048653a DT |
363 | struct stat st; |
364 | int fd; | |
42a38cf7 MH |
365 | int ret = -1; |
366 | int save_errno; | |
e8c42cb9 | 367 | int remaining_retries = 3; |
7bd9bcf3 | 368 | |
fa96ea1b | 369 | *type = 0; |
42a38cf7 | 370 | strbuf_reset(&sb_path); |
34c7ad8f | 371 | |
19e02f4f | 372 | files_ref_path(refs, &sb_path, refname); |
34c7ad8f | 373 | |
42a38cf7 | 374 | path = sb_path.buf; |
7bd9bcf3 | 375 | |
7048653a DT |
376 | stat_ref: |
377 | /* | |
378 | * We might have to loop back here to avoid a race | |
379 | * condition: first we lstat() the file, then we try | |
380 | * to read it as a link or as a file. But if somebody | |
381 | * changes the type of the file (file <-> directory | |
382 | * <-> symlink) between the lstat() and reading, then | |
383 | * we don't want to report that as an error but rather | |
384 | * try again starting with the lstat(). | |
e8c42cb9 JK |
385 | * |
386 | * We'll keep a count of the retries, though, just to avoid | |
387 | * any confusing situation sending us into an infinite loop. | |
7048653a | 388 | */ |
7bd9bcf3 | 389 | |
e8c42cb9 JK |
390 | if (remaining_retries-- <= 0) |
391 | goto out; | |
392 | ||
7048653a DT |
393 | if (lstat(path, &st) < 0) { |
394 | if (errno != ENOENT) | |
42a38cf7 | 395 | goto out; |
e0cc8ac8 | 396 | if (refs_read_raw_ref(refs->packed_ref_store, refname, |
99afe91a | 397 | oid, referent, type)) { |
7048653a | 398 | errno = ENOENT; |
42a38cf7 | 399 | goto out; |
7bd9bcf3 | 400 | } |
42a38cf7 MH |
401 | ret = 0; |
402 | goto out; | |
7bd9bcf3 | 403 | } |
7bd9bcf3 | 404 | |
7048653a DT |
405 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
406 | if (S_ISLNK(st.st_mode)) { | |
42a38cf7 | 407 | strbuf_reset(&sb_contents); |
765b496d | 408 | if (strbuf_readlink(&sb_contents, path, st.st_size) < 0) { |
7048653a | 409 | if (errno == ENOENT || errno == EINVAL) |
7bd9bcf3 MH |
410 | /* inconsistent with lstat; retry */ |
411 | goto stat_ref; | |
412 | else | |
42a38cf7 | 413 | goto out; |
7bd9bcf3 | 414 | } |
42a38cf7 MH |
415 | if (starts_with(sb_contents.buf, "refs/") && |
416 | !check_refname_format(sb_contents.buf, 0)) { | |
92b38093 | 417 | strbuf_swap(&sb_contents, referent); |
3a0b6b9a | 418 | *type |= REF_ISSYMREF; |
42a38cf7 MH |
419 | ret = 0; |
420 | goto out; | |
7bd9bcf3 | 421 | } |
3f7bd767 JK |
422 | /* |
423 | * It doesn't look like a refname; fall through to just | |
424 | * treating it like a non-symlink, and reading whatever it | |
425 | * points to. | |
426 | */ | |
7048653a | 427 | } |
7bd9bcf3 | 428 | |
7048653a DT |
429 | /* Is it a directory? */ |
430 | if (S_ISDIR(st.st_mode)) { | |
e167a567 MH |
431 | /* |
432 | * Even though there is a directory where the loose | |
433 | * ref is supposed to be, there could still be a | |
434 | * packed ref: | |
435 | */ | |
e0cc8ac8 | 436 | if (refs_read_raw_ref(refs->packed_ref_store, refname, |
99afe91a | 437 | oid, referent, type)) { |
e167a567 MH |
438 | errno = EISDIR; |
439 | goto out; | |
440 | } | |
441 | ret = 0; | |
42a38cf7 | 442 | goto out; |
7048653a DT |
443 | } |
444 | ||
445 | /* | |
446 | * Anything else, just open it and try to use it as | |
447 | * a ref | |
448 | */ | |
449 | fd = open(path, O_RDONLY); | |
450 | if (fd < 0) { | |
3f7bd767 | 451 | if (errno == ENOENT && !S_ISLNK(st.st_mode)) |
7048653a DT |
452 | /* inconsistent with lstat; retry */ |
453 | goto stat_ref; | |
454 | else | |
42a38cf7 | 455 | goto out; |
7048653a | 456 | } |
42a38cf7 MH |
457 | strbuf_reset(&sb_contents); |
458 | if (strbuf_read(&sb_contents, fd, 256) < 0) { | |
7048653a DT |
459 | int save_errno = errno; |
460 | close(fd); | |
461 | errno = save_errno; | |
42a38cf7 | 462 | goto out; |
7048653a DT |
463 | } |
464 | close(fd); | |
42a38cf7 MH |
465 | strbuf_rtrim(&sb_contents); |
466 | buf = sb_contents.buf; | |
7048653a DT |
467 | if (starts_with(buf, "ref:")) { |
468 | buf += 4; | |
7bd9bcf3 MH |
469 | while (isspace(*buf)) |
470 | buf++; | |
7048653a | 471 | |
92b38093 MH |
472 | strbuf_reset(referent); |
473 | strbuf_addstr(referent, buf); | |
3a0b6b9a | 474 | *type |= REF_ISSYMREF; |
42a38cf7 MH |
475 | ret = 0; |
476 | goto out; | |
7bd9bcf3 | 477 | } |
7bd9bcf3 | 478 | |
7048653a DT |
479 | /* |
480 | * Please note that FETCH_HEAD has additional | |
481 | * data after the sha. | |
482 | */ | |
99afe91a | 483 | if (parse_oid_hex(buf, oid, &p) || |
484 | (*p != '\0' && !isspace(*p))) { | |
3a0b6b9a | 485 | *type |= REF_ISBROKEN; |
7048653a | 486 | errno = EINVAL; |
42a38cf7 | 487 | goto out; |
7048653a DT |
488 | } |
489 | ||
42a38cf7 | 490 | ret = 0; |
7bd9bcf3 | 491 | |
42a38cf7 MH |
492 | out: |
493 | save_errno = errno; | |
7bd9bcf3 MH |
494 | strbuf_release(&sb_path); |
495 | strbuf_release(&sb_contents); | |
42a38cf7 | 496 | errno = save_errno; |
7bd9bcf3 MH |
497 | return ret; |
498 | } | |
499 | ||
8415d247 MH |
500 | static void unlock_ref(struct ref_lock *lock) |
501 | { | |
ee4d8e45 | 502 | rollback_lock_file(&lock->lk); |
8415d247 | 503 | free(lock->ref_name); |
8415d247 MH |
504 | free(lock); |
505 | } | |
506 | ||
92b1551b MH |
507 | /* |
508 | * Lock refname, without following symrefs, and set *lock_p to point | |
509 | * at a newly-allocated lock object. Fill in lock->old_oid, referent, | |
510 | * and type similarly to read_raw_ref(). | |
511 | * | |
512 | * The caller must verify that refname is a "safe" reference name (in | |
513 | * the sense of refname_is_safe()) before calling this function. | |
514 | * | |
515 | * If the reference doesn't already exist, verify that refname doesn't | |
516 | * have a D/F conflict with any existing references. extras and skip | |
524a9fdb | 517 | * are passed to refs_verify_refname_available() for this check. |
92b1551b MH |
518 | * |
519 | * If mustexist is not set and the reference is not found or is | |
78fb4579 | 520 | * broken, lock the reference anyway but clear old_oid. |
92b1551b MH |
521 | * |
522 | * Return 0 on success. On failure, write an error message to err and | |
523 | * return TRANSACTION_NAME_CONFLICT or TRANSACTION_GENERIC_ERROR. | |
524 | * | |
525 | * Implementation note: This function is basically | |
526 | * | |
527 | * lock reference | |
528 | * read_raw_ref() | |
529 | * | |
530 | * but it includes a lot more code to | |
531 | * - Deal with possible races with other processes | |
524a9fdb | 532 | * - Avoid calling refs_verify_refname_available() when it can be |
92b1551b MH |
533 | * avoided, namely if we were successfully able to read the ref |
534 | * - Generate informative error messages in the case of failure | |
535 | */ | |
f7b0a987 MH |
536 | static int lock_raw_ref(struct files_ref_store *refs, |
537 | const char *refname, int mustexist, | |
92b1551b MH |
538 | const struct string_list *extras, |
539 | const struct string_list *skip, | |
540 | struct ref_lock **lock_p, | |
541 | struct strbuf *referent, | |
542 | unsigned int *type, | |
543 | struct strbuf *err) | |
544 | { | |
545 | struct ref_lock *lock; | |
546 | struct strbuf ref_file = STRBUF_INIT; | |
547 | int attempts_remaining = 3; | |
548 | int ret = TRANSACTION_GENERIC_ERROR; | |
549 | ||
550 | assert(err); | |
32c597e7 | 551 | files_assert_main_repository(refs, "lock_raw_ref"); |
f7b0a987 | 552 | |
92b1551b MH |
553 | *type = 0; |
554 | ||
555 | /* First lock the file so it can't change out from under us. */ | |
556 | ||
557 | *lock_p = lock = xcalloc(1, sizeof(*lock)); | |
558 | ||
559 | lock->ref_name = xstrdup(refname); | |
19e02f4f | 560 | files_ref_path(refs, &ref_file, refname); |
92b1551b MH |
561 | |
562 | retry: | |
563 | switch (safe_create_leading_directories(ref_file.buf)) { | |
564 | case SCLD_OK: | |
565 | break; /* success */ | |
566 | case SCLD_EXISTS: | |
567 | /* | |
568 | * Suppose refname is "refs/foo/bar". We just failed | |
569 | * to create the containing directory, "refs/foo", | |
570 | * because there was a non-directory in the way. This | |
571 | * indicates a D/F conflict, probably because of | |
572 | * another reference such as "refs/foo". There is no | |
573 | * reason to expect this error to be transitory. | |
574 | */ | |
7d2df051 NTND |
575 | if (refs_verify_refname_available(&refs->base, refname, |
576 | extras, skip, err)) { | |
92b1551b MH |
577 | if (mustexist) { |
578 | /* | |
579 | * To the user the relevant error is | |
580 | * that the "mustexist" reference is | |
581 | * missing: | |
582 | */ | |
583 | strbuf_reset(err); | |
584 | strbuf_addf(err, "unable to resolve reference '%s'", | |
585 | refname); | |
586 | } else { | |
587 | /* | |
588 | * The error message set by | |
524a9fdb MH |
589 | * refs_verify_refname_available() is |
590 | * OK. | |
92b1551b MH |
591 | */ |
592 | ret = TRANSACTION_NAME_CONFLICT; | |
593 | } | |
594 | } else { | |
595 | /* | |
596 | * The file that is in the way isn't a loose | |
597 | * reference. Report it as a low-level | |
598 | * failure. | |
599 | */ | |
600 | strbuf_addf(err, "unable to create lock file %s.lock; " | |
601 | "non-directory in the way", | |
602 | ref_file.buf); | |
603 | } | |
604 | goto error_return; | |
605 | case SCLD_VANISHED: | |
606 | /* Maybe another process was tidying up. Try again. */ | |
607 | if (--attempts_remaining > 0) | |
608 | goto retry; | |
609 | /* fall through */ | |
610 | default: | |
611 | strbuf_addf(err, "unable to create directory for %s", | |
612 | ref_file.buf); | |
613 | goto error_return; | |
614 | } | |
615 | ||
4ff0f01c | 616 | if (hold_lock_file_for_update_timeout( |
ee4d8e45 | 617 | &lock->lk, ref_file.buf, LOCK_NO_DEREF, |
4ff0f01c | 618 | get_files_ref_lock_timeout_ms()) < 0) { |
92b1551b MH |
619 | if (errno == ENOENT && --attempts_remaining > 0) { |
620 | /* | |
621 | * Maybe somebody just deleted one of the | |
622 | * directories leading to ref_file. Try | |
623 | * again: | |
624 | */ | |
625 | goto retry; | |
626 | } else { | |
627 | unable_to_lock_message(ref_file.buf, errno, err); | |
628 | goto error_return; | |
629 | } | |
630 | } | |
631 | ||
632 | /* | |
633 | * Now we hold the lock and can read the reference without | |
634 | * fear that its value will change. | |
635 | */ | |
636 | ||
f7b0a987 | 637 | if (files_read_raw_ref(&refs->base, refname, |
99afe91a | 638 | &lock->old_oid, referent, type)) { |
92b1551b MH |
639 | if (errno == ENOENT) { |
640 | if (mustexist) { | |
641 | /* Garden variety missing reference. */ | |
642 | strbuf_addf(err, "unable to resolve reference '%s'", | |
643 | refname); | |
644 | goto error_return; | |
645 | } else { | |
646 | /* | |
647 | * Reference is missing, but that's OK. We | |
648 | * know that there is not a conflict with | |
649 | * another loose reference because | |
650 | * (supposing that we are trying to lock | |
651 | * reference "refs/foo/bar"): | |
652 | * | |
653 | * - We were successfully able to create | |
654 | * the lockfile refs/foo/bar.lock, so we | |
655 | * know there cannot be a loose reference | |
656 | * named "refs/foo". | |
657 | * | |
658 | * - We got ENOENT and not EISDIR, so we | |
659 | * know that there cannot be a loose | |
660 | * reference named "refs/foo/bar/baz". | |
661 | */ | |
662 | } | |
663 | } else if (errno == EISDIR) { | |
664 | /* | |
665 | * There is a directory in the way. It might have | |
666 | * contained references that have been deleted. If | |
667 | * we don't require that the reference already | |
668 | * exists, try to remove the directory so that it | |
669 | * doesn't cause trouble when we want to rename the | |
670 | * lockfile into place later. | |
671 | */ | |
672 | if (mustexist) { | |
673 | /* Garden variety missing reference. */ | |
674 | strbuf_addf(err, "unable to resolve reference '%s'", | |
675 | refname); | |
676 | goto error_return; | |
677 | } else if (remove_dir_recursively(&ref_file, | |
678 | REMOVE_DIR_EMPTY_ONLY)) { | |
b05855b5 MH |
679 | if (refs_verify_refname_available( |
680 | &refs->base, refname, | |
681 | extras, skip, err)) { | |
92b1551b MH |
682 | /* |
683 | * The error message set by | |
684 | * verify_refname_available() is OK. | |
685 | */ | |
686 | ret = TRANSACTION_NAME_CONFLICT; | |
687 | goto error_return; | |
688 | } else { | |
689 | /* | |
690 | * We can't delete the directory, | |
691 | * but we also don't know of any | |
692 | * references that it should | |
693 | * contain. | |
694 | */ | |
695 | strbuf_addf(err, "there is a non-empty directory '%s' " | |
696 | "blocking reference '%s'", | |
697 | ref_file.buf, refname); | |
698 | goto error_return; | |
699 | } | |
700 | } | |
701 | } else if (errno == EINVAL && (*type & REF_ISBROKEN)) { | |
702 | strbuf_addf(err, "unable to resolve reference '%s': " | |
703 | "reference broken", refname); | |
704 | goto error_return; | |
705 | } else { | |
706 | strbuf_addf(err, "unable to resolve reference '%s': %s", | |
707 | refname, strerror(errno)); | |
708 | goto error_return; | |
709 | } | |
710 | ||
711 | /* | |
712 | * If the ref did not exist and we are creating it, | |
8ec617c8 MH |
713 | * make sure there is no existing packed ref that |
714 | * conflicts with refname: | |
92b1551b | 715 | */ |
524a9fdb | 716 | if (refs_verify_refname_available( |
8ec617c8 | 717 | refs->packed_ref_store, refname, |
524a9fdb | 718 | extras, skip, err)) |
92b1551b | 719 | goto error_return; |
92b1551b MH |
720 | } |
721 | ||
722 | ret = 0; | |
723 | goto out; | |
724 | ||
725 | error_return: | |
726 | unlock_ref(lock); | |
727 | *lock_p = NULL; | |
728 | ||
729 | out: | |
730 | strbuf_release(&ref_file); | |
731 | return ret; | |
732 | } | |
733 | ||
3bc581b9 MH |
734 | struct files_ref_iterator { |
735 | struct ref_iterator base; | |
736 | ||
3bc581b9 MH |
737 | struct ref_iterator *iter0; |
738 | unsigned int flags; | |
739 | }; | |
7bd9bcf3 | 740 | |
3bc581b9 MH |
741 | static int files_ref_iterator_advance(struct ref_iterator *ref_iterator) |
742 | { | |
743 | struct files_ref_iterator *iter = | |
744 | (struct files_ref_iterator *)ref_iterator; | |
745 | int ok; | |
7bd9bcf3 | 746 | |
3bc581b9 | 747 | while ((ok = ref_iterator_advance(iter->iter0)) == ITER_OK) { |
0c09ec07 DT |
748 | if (iter->flags & DO_FOR_EACH_PER_WORKTREE_ONLY && |
749 | ref_type(iter->iter0->refname) != REF_TYPE_PER_WORKTREE) | |
750 | continue; | |
751 | ||
3bc581b9 MH |
752 | if (!(iter->flags & DO_FOR_EACH_INCLUDE_BROKEN) && |
753 | !ref_resolves_to_object(iter->iter0->refname, | |
754 | iter->iter0->oid, | |
755 | iter->iter0->flags)) | |
756 | continue; | |
757 | ||
758 | iter->base.refname = iter->iter0->refname; | |
759 | iter->base.oid = iter->iter0->oid; | |
760 | iter->base.flags = iter->iter0->flags; | |
761 | return ITER_OK; | |
7bd9bcf3 MH |
762 | } |
763 | ||
3bc581b9 MH |
764 | iter->iter0 = NULL; |
765 | if (ref_iterator_abort(ref_iterator) != ITER_DONE) | |
766 | ok = ITER_ERROR; | |
767 | ||
768 | return ok; | |
7bd9bcf3 MH |
769 | } |
770 | ||
3bc581b9 MH |
771 | static int files_ref_iterator_peel(struct ref_iterator *ref_iterator, |
772 | struct object_id *peeled) | |
7bd9bcf3 | 773 | { |
3bc581b9 MH |
774 | struct files_ref_iterator *iter = |
775 | (struct files_ref_iterator *)ref_iterator; | |
93770590 | 776 | |
3bc581b9 MH |
777 | return ref_iterator_peel(iter->iter0, peeled); |
778 | } | |
779 | ||
780 | static int files_ref_iterator_abort(struct ref_iterator *ref_iterator) | |
781 | { | |
782 | struct files_ref_iterator *iter = | |
783 | (struct files_ref_iterator *)ref_iterator; | |
784 | int ok = ITER_DONE; | |
785 | ||
786 | if (iter->iter0) | |
787 | ok = ref_iterator_abort(iter->iter0); | |
788 | ||
3bc581b9 MH |
789 | base_ref_iterator_free(ref_iterator); |
790 | return ok; | |
791 | } | |
792 | ||
793 | static struct ref_iterator_vtable files_ref_iterator_vtable = { | |
794 | files_ref_iterator_advance, | |
795 | files_ref_iterator_peel, | |
796 | files_ref_iterator_abort | |
797 | }; | |
798 | ||
1a769003 | 799 | static struct ref_iterator *files_ref_iterator_begin( |
37b6f6d5 | 800 | struct ref_store *ref_store, |
3bc581b9 MH |
801 | const char *prefix, unsigned int flags) |
802 | { | |
9e7ec634 | 803 | struct files_ref_store *refs; |
8738a8a4 | 804 | struct ref_iterator *loose_iter, *packed_iter, *overlay_iter; |
3bc581b9 MH |
805 | struct files_ref_iterator *iter; |
806 | struct ref_iterator *ref_iterator; | |
0a0865b8 | 807 | unsigned int required_flags = REF_STORE_READ; |
3bc581b9 | 808 | |
0a0865b8 MH |
809 | if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) |
810 | required_flags |= REF_STORE_ODB; | |
3bc581b9 | 811 | |
0a0865b8 | 812 | refs = files_downcast(ref_store, required_flags, "ref_iterator_begin"); |
9e7ec634 | 813 | |
3bc581b9 MH |
814 | /* |
815 | * We must make sure that all loose refs are read before | |
816 | * accessing the packed-refs file; this avoids a race | |
817 | * condition if loose refs are migrated to the packed-refs | |
818 | * file by a simultaneous process, but our in-memory view is | |
819 | * from before the migration. We ensure this as follows: | |
059ae35a MH |
820 | * First, we call start the loose refs iteration with its |
821 | * `prime_ref` argument set to true. This causes the loose | |
822 | * references in the subtree to be pre-read into the cache. | |
823 | * (If they've already been read, that's OK; we only need to | |
824 | * guarantee that they're read before the packed refs, not | |
825 | * *how much* before.) After that, we call | |
38b86e81 MH |
826 | * packed_ref_iterator_begin(), which internally checks |
827 | * whether the packed-ref cache is up to date with what is on | |
828 | * disk, and re-reads it if not. | |
3bc581b9 MH |
829 | */ |
830 | ||
059ae35a MH |
831 | loose_iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), |
832 | prefix, 1); | |
3bc581b9 | 833 | |
38b86e81 MH |
834 | /* |
835 | * The packed-refs file might contain broken references, for | |
836 | * example an old version of a reference that points at an | |
837 | * object that has since been garbage-collected. This is OK as | |
838 | * long as there is a corresponding loose reference that | |
839 | * overrides it, and we don't want to emit an error message in | |
840 | * this case. So ask the packed_ref_store for all of its | |
841 | * references, and (if needed) do our own check for broken | |
842 | * ones in files_ref_iterator_advance(), after we have merged | |
843 | * the packed and loose references. | |
844 | */ | |
e0cc8ac8 MH |
845 | packed_iter = refs_ref_iterator_begin( |
846 | refs->packed_ref_store, prefix, 0, | |
38b86e81 | 847 | DO_FOR_EACH_INCLUDE_BROKEN); |
3bc581b9 | 848 | |
8738a8a4 MH |
849 | overlay_iter = overlay_ref_iterator_begin(loose_iter, packed_iter); |
850 | ||
851 | iter = xcalloc(1, sizeof(*iter)); | |
852 | ref_iterator = &iter->base; | |
853 | base_ref_iterator_init(ref_iterator, &files_ref_iterator_vtable, | |
854 | overlay_iter->ordered); | |
855 | iter->iter0 = overlay_iter; | |
3bc581b9 MH |
856 | iter->flags = flags; |
857 | ||
858 | return ref_iterator; | |
7bd9bcf3 MH |
859 | } |
860 | ||
7bd9bcf3 | 861 | /* |
4f01e508 | 862 | * Verify that the reference locked by lock has the value old_oid |
863 | * (unless it is NULL). Fail if the reference doesn't exist and | |
864 | * mustexist is set. Return 0 on success. On error, write an error | |
865 | * message to err, set errno, and return a negative value. | |
7bd9bcf3 | 866 | */ |
2f40e954 | 867 | static int verify_lock(struct ref_store *ref_store, struct ref_lock *lock, |
4f01e508 | 868 | const struct object_id *old_oid, int mustexist, |
7bd9bcf3 MH |
869 | struct strbuf *err) |
870 | { | |
871 | assert(err); | |
872 | ||
2f40e954 NTND |
873 | if (refs_read_ref_full(ref_store, lock->ref_name, |
874 | mustexist ? RESOLVE_REF_READING : 0, | |
34c290a6 | 875 | &lock->old_oid, NULL)) { |
4f01e508 | 876 | if (old_oid) { |
6294dcb4 | 877 | int save_errno = errno; |
0568c8e9 | 878 | strbuf_addf(err, "can't verify ref '%s'", lock->ref_name); |
6294dcb4 JK |
879 | errno = save_errno; |
880 | return -1; | |
881 | } else { | |
c368dde9 | 882 | oidclr(&lock->old_oid); |
6294dcb4 JK |
883 | return 0; |
884 | } | |
7bd9bcf3 | 885 | } |
9001dc2a | 886 | if (old_oid && !oideq(&lock->old_oid, old_oid)) { |
0568c8e9 | 887 | strbuf_addf(err, "ref '%s' is at %s but expected %s", |
7bd9bcf3 | 888 | lock->ref_name, |
c368dde9 | 889 | oid_to_hex(&lock->old_oid), |
4f01e508 | 890 | oid_to_hex(old_oid)); |
7bd9bcf3 MH |
891 | errno = EBUSY; |
892 | return -1; | |
893 | } | |
894 | return 0; | |
895 | } | |
896 | ||
897 | static int remove_empty_directories(struct strbuf *path) | |
898 | { | |
899 | /* | |
900 | * we want to create a file but there is a directory there; | |
901 | * if that is an empty directory (or a directory that contains | |
902 | * only empty directories), remove them. | |
903 | */ | |
904 | return remove_dir_recursively(path, REMOVE_DIR_EMPTY_ONLY); | |
905 | } | |
906 | ||
3b5d3c98 MH |
907 | static int create_reflock(const char *path, void *cb) |
908 | { | |
909 | struct lock_file *lk = cb; | |
910 | ||
4ff0f01c MH |
911 | return hold_lock_file_for_update_timeout( |
912 | lk, path, LOCK_NO_DEREF, | |
913 | get_files_ref_lock_timeout_ms()) < 0 ? -1 : 0; | |
3b5d3c98 MH |
914 | } |
915 | ||
7bd9bcf3 MH |
916 | /* |
917 | * Locks a ref returning the lock on success and NULL on failure. | |
918 | * On failure errno is set to something meaningful. | |
919 | */ | |
4f01e508 | 920 | static struct ref_lock *lock_ref_oid_basic(struct files_ref_store *refs, |
921 | const char *refname, | |
922 | const struct object_id *old_oid, | |
923 | const struct string_list *extras, | |
924 | const struct string_list *skip, | |
925 | unsigned int flags, int *type, | |
926 | struct strbuf *err) | |
7bd9bcf3 MH |
927 | { |
928 | struct strbuf ref_file = STRBUF_INIT; | |
7bd9bcf3 MH |
929 | struct ref_lock *lock; |
930 | int last_errno = 0; | |
4f01e508 | 931 | int mustexist = (old_oid && !is_null_oid(old_oid)); |
7a418f3a | 932 | int resolve_flags = RESOLVE_REF_NO_RECURSE; |
7a418f3a | 933 | int resolved; |
7bd9bcf3 | 934 | |
4f01e508 | 935 | files_assert_main_repository(refs, "lock_ref_oid_basic"); |
7bd9bcf3 MH |
936 | assert(err); |
937 | ||
938 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
939 | ||
940 | if (mustexist) | |
941 | resolve_flags |= RESOLVE_REF_READING; | |
2859dcd4 | 942 | if (flags & REF_DELETING) |
7bd9bcf3 | 943 | resolve_flags |= RESOLVE_REF_ALLOW_BAD_NAME; |
7bd9bcf3 | 944 | |
19e02f4f | 945 | files_ref_path(refs, &ref_file, refname); |
2f40e954 NTND |
946 | resolved = !!refs_resolve_ref_unsafe(&refs->base, |
947 | refname, resolve_flags, | |
49e61479 | 948 | &lock->old_oid, type); |
7a418f3a | 949 | if (!resolved && errno == EISDIR) { |
7bd9bcf3 MH |
950 | /* |
951 | * we are trying to lock foo but we used to | |
952 | * have foo/bar which now does not exist; | |
953 | * it is normal for the empty directory 'foo' | |
954 | * to remain. | |
955 | */ | |
7a418f3a | 956 | if (remove_empty_directories(&ref_file)) { |
7bd9bcf3 | 957 | last_errno = errno; |
b05855b5 MH |
958 | if (!refs_verify_refname_available( |
959 | &refs->base, | |
960 | refname, extras, skip, err)) | |
7bd9bcf3 | 961 | strbuf_addf(err, "there are still refs under '%s'", |
7a418f3a | 962 | refname); |
7bd9bcf3 MH |
963 | goto error_return; |
964 | } | |
2f40e954 NTND |
965 | resolved = !!refs_resolve_ref_unsafe(&refs->base, |
966 | refname, resolve_flags, | |
49e61479 | 967 | &lock->old_oid, type); |
7bd9bcf3 | 968 | } |
7a418f3a | 969 | if (!resolved) { |
7bd9bcf3 MH |
970 | last_errno = errno; |
971 | if (last_errno != ENOTDIR || | |
b05855b5 MH |
972 | !refs_verify_refname_available(&refs->base, refname, |
973 | extras, skip, err)) | |
0568c8e9 | 974 | strbuf_addf(err, "unable to resolve reference '%s': %s", |
7a418f3a | 975 | refname, strerror(last_errno)); |
7bd9bcf3 MH |
976 | |
977 | goto error_return; | |
978 | } | |
2859dcd4 | 979 | |
7bd9bcf3 MH |
980 | /* |
981 | * If the ref did not exist and we are creating it, make sure | |
982 | * there is no existing packed ref whose name begins with our | |
983 | * refname, nor a packed ref whose name is a proper prefix of | |
984 | * our refname. | |
985 | */ | |
986 | if (is_null_oid(&lock->old_oid) && | |
8ec617c8 | 987 | refs_verify_refname_available(refs->packed_ref_store, refname, |
524a9fdb | 988 | extras, skip, err)) { |
7bd9bcf3 MH |
989 | last_errno = ENOTDIR; |
990 | goto error_return; | |
991 | } | |
992 | ||
7bd9bcf3 | 993 | lock->ref_name = xstrdup(refname); |
7bd9bcf3 | 994 | |
ee4d8e45 | 995 | if (raceproof_create_file(ref_file.buf, create_reflock, &lock->lk)) { |
7bd9bcf3 | 996 | last_errno = errno; |
3b5d3c98 | 997 | unable_to_lock_message(ref_file.buf, errno, err); |
7bd9bcf3 MH |
998 | goto error_return; |
999 | } | |
1000 | ||
4f01e508 | 1001 | if (verify_lock(&refs->base, lock, old_oid, mustexist, err)) { |
7bd9bcf3 MH |
1002 | last_errno = errno; |
1003 | goto error_return; | |
1004 | } | |
1005 | goto out; | |
1006 | ||
1007 | error_return: | |
1008 | unlock_ref(lock); | |
1009 | lock = NULL; | |
1010 | ||
1011 | out: | |
1012 | strbuf_release(&ref_file); | |
7bd9bcf3 MH |
1013 | errno = last_errno; |
1014 | return lock; | |
1015 | } | |
1016 | ||
7bd9bcf3 MH |
1017 | struct ref_to_prune { |
1018 | struct ref_to_prune *next; | |
49e99588 | 1019 | struct object_id oid; |
7bd9bcf3 MH |
1020 | char name[FLEX_ARRAY]; |
1021 | }; | |
1022 | ||
a8f0db2d MH |
1023 | enum { |
1024 | REMOVE_EMPTY_PARENTS_REF = 0x01, | |
1025 | REMOVE_EMPTY_PARENTS_REFLOG = 0x02 | |
1026 | }; | |
1027 | ||
7bd9bcf3 | 1028 | /* |
a8f0db2d MH |
1029 | * Remove empty parent directories associated with the specified |
1030 | * reference and/or its reflog, but spare [logs/]refs/ and immediate | |
1031 | * subdirs. flags is a combination of REMOVE_EMPTY_PARENTS_REF and/or | |
1032 | * REMOVE_EMPTY_PARENTS_REFLOG. | |
7bd9bcf3 | 1033 | */ |
802de3da NTND |
1034 | static void try_remove_empty_parents(struct files_ref_store *refs, |
1035 | const char *refname, | |
1036 | unsigned int flags) | |
7bd9bcf3 | 1037 | { |
8bdaecb4 | 1038 | struct strbuf buf = STRBUF_INIT; |
e9dcc305 | 1039 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 MH |
1040 | char *p, *q; |
1041 | int i; | |
8bdaecb4 MH |
1042 | |
1043 | strbuf_addstr(&buf, refname); | |
1044 | p = buf.buf; | |
7bd9bcf3 MH |
1045 | for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */ |
1046 | while (*p && *p != '/') | |
1047 | p++; | |
1048 | /* tolerate duplicate slashes; see check_refname_format() */ | |
1049 | while (*p == '/') | |
1050 | p++; | |
1051 | } | |
8bdaecb4 | 1052 | q = buf.buf + buf.len; |
a8f0db2d | 1053 | while (flags & (REMOVE_EMPTY_PARENTS_REF | REMOVE_EMPTY_PARENTS_REFLOG)) { |
7bd9bcf3 MH |
1054 | while (q > p && *q != '/') |
1055 | q--; | |
1056 | while (q > p && *(q-1) == '/') | |
1057 | q--; | |
1058 | if (q == p) | |
1059 | break; | |
8bdaecb4 | 1060 | strbuf_setlen(&buf, q - buf.buf); |
e9dcc305 NTND |
1061 | |
1062 | strbuf_reset(&sb); | |
19e02f4f | 1063 | files_ref_path(refs, &sb, buf.buf); |
e9dcc305 | 1064 | if ((flags & REMOVE_EMPTY_PARENTS_REF) && rmdir(sb.buf)) |
a8f0db2d | 1065 | flags &= ~REMOVE_EMPTY_PARENTS_REF; |
e9dcc305 NTND |
1066 | |
1067 | strbuf_reset(&sb); | |
802de3da | 1068 | files_reflog_path(refs, &sb, buf.buf); |
e9dcc305 | 1069 | if ((flags & REMOVE_EMPTY_PARENTS_REFLOG) && rmdir(sb.buf)) |
a8f0db2d | 1070 | flags &= ~REMOVE_EMPTY_PARENTS_REFLOG; |
7bd9bcf3 | 1071 | } |
8bdaecb4 | 1072 | strbuf_release(&buf); |
e9dcc305 | 1073 | strbuf_release(&sb); |
7bd9bcf3 MH |
1074 | } |
1075 | ||
1076 | /* make sure nobody touched the ref, and unlink */ | |
2f40e954 | 1077 | static void prune_ref(struct files_ref_store *refs, struct ref_to_prune *r) |
7bd9bcf3 MH |
1078 | { |
1079 | struct ref_transaction *transaction; | |
1080 | struct strbuf err = STRBUF_INIT; | |
b00f3cfa | 1081 | int ret = -1; |
7bd9bcf3 MH |
1082 | |
1083 | if (check_refname_format(r->name, 0)) | |
1084 | return; | |
1085 | ||
2f40e954 | 1086 | transaction = ref_store_transaction_begin(&refs->base, &err); |
b00f3cfa MH |
1087 | if (!transaction) |
1088 | goto cleanup; | |
1089 | ref_transaction_add_update( | |
1090 | transaction, r->name, | |
acedcde7 | 1091 | REF_NO_DEREF | REF_HAVE_NEW | REF_HAVE_OLD | REF_IS_PRUNING, |
b00f3cfa MH |
1092 | &null_oid, &r->oid, NULL); |
1093 | if (ref_transaction_commit(transaction, &err)) | |
1094 | goto cleanup; | |
1095 | ||
1096 | ret = 0; | |
1097 | ||
1098 | cleanup: | |
1099 | if (ret) | |
7bd9bcf3 | 1100 | error("%s", err.buf); |
7bd9bcf3 | 1101 | strbuf_release(&err); |
b00f3cfa MH |
1102 | ref_transaction_free(transaction); |
1103 | return; | |
7bd9bcf3 MH |
1104 | } |
1105 | ||
22b09cdf MH |
1106 | /* |
1107 | * Prune the loose versions of the references in the linked list | |
1108 | * `*refs_to_prune`, freeing the entries in the list as we go. | |
1109 | */ | |
1110 | static void prune_refs(struct files_ref_store *refs, struct ref_to_prune **refs_to_prune) | |
7bd9bcf3 | 1111 | { |
22b09cdf MH |
1112 | while (*refs_to_prune) { |
1113 | struct ref_to_prune *r = *refs_to_prune; | |
1114 | *refs_to_prune = r->next; | |
2f40e954 | 1115 | prune_ref(refs, r); |
22b09cdf | 1116 | free(r); |
7bd9bcf3 MH |
1117 | } |
1118 | } | |
1119 | ||
531cc4a5 MH |
1120 | /* |
1121 | * Return true if the specified reference should be packed. | |
1122 | */ | |
1123 | static int should_pack_ref(const char *refname, | |
1124 | const struct object_id *oid, unsigned int ref_flags, | |
1125 | unsigned int pack_flags) | |
1126 | { | |
1127 | /* Do not pack per-worktree refs: */ | |
1128 | if (ref_type(refname) != REF_TYPE_NORMAL) | |
1129 | return 0; | |
1130 | ||
1131 | /* Do not pack non-tags unless PACK_REFS_ALL is set: */ | |
1132 | if (!(pack_flags & PACK_REFS_ALL) && !starts_with(refname, "refs/tags/")) | |
1133 | return 0; | |
1134 | ||
1135 | /* Do not pack symbolic refs: */ | |
1136 | if (ref_flags & REF_ISSYMREF) | |
1137 | return 0; | |
1138 | ||
1139 | /* Do not pack broken refs: */ | |
1140 | if (!ref_resolves_to_object(refname, oid, ref_flags)) | |
1141 | return 0; | |
1142 | ||
1143 | return 1; | |
1144 | } | |
1145 | ||
8231527e | 1146 | static int files_pack_refs(struct ref_store *ref_store, unsigned int flags) |
7bd9bcf3 | 1147 | { |
00eebe35 | 1148 | struct files_ref_store *refs = |
9e7ec634 NTND |
1149 | files_downcast(ref_store, REF_STORE_WRITE | REF_STORE_ODB, |
1150 | "pack_refs"); | |
50c2d855 | 1151 | struct ref_iterator *iter; |
50c2d855 MH |
1152 | int ok; |
1153 | struct ref_to_prune *refs_to_prune = NULL; | |
3478983b | 1154 | struct strbuf err = STRBUF_INIT; |
27d03d04 MH |
1155 | struct ref_transaction *transaction; |
1156 | ||
1157 | transaction = ref_store_transaction_begin(refs->packed_ref_store, &err); | |
1158 | if (!transaction) | |
1159 | return -1; | |
7bd9bcf3 | 1160 | |
c8bed835 | 1161 | packed_refs_lock(refs->packed_ref_store, LOCK_DIE_ON_ERROR, &err); |
50c2d855 MH |
1162 | |
1163 | iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), NULL, 0); | |
1164 | while ((ok = ref_iterator_advance(iter)) == ITER_OK) { | |
1165 | /* | |
1166 | * If the loose reference can be packed, add an entry | |
1167 | * in the packed ref cache. If the reference should be | |
1168 | * pruned, also add it to refs_to_prune. | |
1169 | */ | |
531cc4a5 MH |
1170 | if (!should_pack_ref(iter->refname, iter->oid, iter->flags, |
1171 | flags)) | |
50c2d855 MH |
1172 | continue; |
1173 | ||
1174 | /* | |
27d03d04 MH |
1175 | * Add a reference creation for this reference to the |
1176 | * packed-refs transaction: | |
50c2d855 | 1177 | */ |
27d03d04 | 1178 | if (ref_transaction_update(transaction, iter->refname, |
89f3bbdd | 1179 | iter->oid, NULL, |
91774afc | 1180 | REF_NO_DEREF, NULL, &err)) |
27d03d04 MH |
1181 | die("failure preparing to create packed reference %s: %s", |
1182 | iter->refname, err.buf); | |
50c2d855 MH |
1183 | |
1184 | /* Schedule the loose reference for pruning if requested. */ | |
1185 | if ((flags & PACK_REFS_PRUNE)) { | |
1186 | struct ref_to_prune *n; | |
1187 | FLEX_ALLOC_STR(n, name, iter->refname); | |
49e99588 | 1188 | oidcpy(&n->oid, iter->oid); |
50c2d855 MH |
1189 | n->next = refs_to_prune; |
1190 | refs_to_prune = n; | |
1191 | } | |
1192 | } | |
1193 | if (ok != ITER_DONE) | |
1194 | die("error while iterating over references"); | |
7bd9bcf3 | 1195 | |
27d03d04 MH |
1196 | if (ref_transaction_commit(transaction, &err)) |
1197 | die("unable to write new packed-refs: %s", err.buf); | |
1198 | ||
1199 | ref_transaction_free(transaction); | |
1200 | ||
42c7f7ff | 1201 | packed_refs_unlock(refs->packed_ref_store); |
7bd9bcf3 | 1202 | |
22b09cdf | 1203 | prune_refs(refs, &refs_to_prune); |
3478983b | 1204 | strbuf_release(&err); |
7bd9bcf3 MH |
1205 | return 0; |
1206 | } | |
1207 | ||
64da4199 | 1208 | static int files_delete_refs(struct ref_store *ref_store, const char *msg, |
a27dcf89 | 1209 | struct string_list *refnames, unsigned int flags) |
7bd9bcf3 | 1210 | { |
0a95ac5f | 1211 | struct files_ref_store *refs = |
9e7ec634 | 1212 | files_downcast(ref_store, REF_STORE_WRITE, "delete_refs"); |
7bd9bcf3 MH |
1213 | struct strbuf err = STRBUF_INIT; |
1214 | int i, result = 0; | |
1215 | ||
1216 | if (!refnames->nr) | |
1217 | return 0; | |
1218 | ||
e5cc7d7d MH |
1219 | if (packed_refs_lock(refs->packed_ref_store, 0, &err)) |
1220 | goto error; | |
7bd9bcf3 | 1221 | |
2fb330ca | 1222 | if (refs_delete_refs(refs->packed_ref_store, msg, refnames, flags)) { |
e5cc7d7d MH |
1223 | packed_refs_unlock(refs->packed_ref_store); |
1224 | goto error; | |
7bd9bcf3 MH |
1225 | } |
1226 | ||
e5cc7d7d MH |
1227 | packed_refs_unlock(refs->packed_ref_store); |
1228 | ||
7bd9bcf3 MH |
1229 | for (i = 0; i < refnames->nr; i++) { |
1230 | const char *refname = refnames->items[i].string; | |
1231 | ||
64da4199 | 1232 | if (refs_delete_ref(&refs->base, msg, refname, NULL, flags)) |
7bd9bcf3 MH |
1233 | result |= error(_("could not remove reference %s"), refname); |
1234 | } | |
1235 | ||
7bd9bcf3 MH |
1236 | strbuf_release(&err); |
1237 | return result; | |
e5cc7d7d MH |
1238 | |
1239 | error: | |
1240 | /* | |
1241 | * If we failed to rewrite the packed-refs file, then it is | |
1242 | * unsafe to try to remove loose refs, because doing so might | |
1243 | * expose an obsolete packed value for a reference that might | |
1244 | * even point at an object that has been garbage collected. | |
1245 | */ | |
1246 | if (refnames->nr == 1) | |
1247 | error(_("could not delete reference %s: %s"), | |
1248 | refnames->items[0].string, err.buf); | |
1249 | else | |
1250 | error(_("could not delete references: %s"), err.buf); | |
1251 | ||
1252 | strbuf_release(&err); | |
1253 | return -1; | |
7bd9bcf3 MH |
1254 | } |
1255 | ||
1256 | /* | |
1257 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
1258 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
1259 | * | |
1260 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
1261 | * live into logs/refs. | |
1262 | */ | |
a5c1efd6 | 1263 | #define TMP_RENAMED_LOG "refs/.tmp-renamed-log" |
7bd9bcf3 | 1264 | |
e9dcc305 NTND |
1265 | struct rename_cb { |
1266 | const char *tmp_renamed_log; | |
1267 | int true_errno; | |
1268 | }; | |
1269 | ||
1270 | static int rename_tmp_log_callback(const char *path, void *cb_data) | |
7bd9bcf3 | 1271 | { |
e9dcc305 | 1272 | struct rename_cb *cb = cb_data; |
7bd9bcf3 | 1273 | |
e9dcc305 | 1274 | if (rename(cb->tmp_renamed_log, path)) { |
6a7f3631 MH |
1275 | /* |
1276 | * rename(a, b) when b is an existing directory ought | |
1277 | * to result in ISDIR, but Solaris 5.8 gives ENOTDIR. | |
1278 | * Sheesh. Record the true errno for error reporting, | |
1279 | * but report EISDIR to raceproof_create_file() so | |
1280 | * that it knows to retry. | |
1281 | */ | |
e9dcc305 | 1282 | cb->true_errno = errno; |
6a7f3631 MH |
1283 | if (errno == ENOTDIR) |
1284 | errno = EISDIR; | |
1285 | return -1; | |
1286 | } else { | |
1287 | return 0; | |
7bd9bcf3 | 1288 | } |
6a7f3631 | 1289 | } |
7bd9bcf3 | 1290 | |
802de3da | 1291 | static int rename_tmp_log(struct files_ref_store *refs, const char *newrefname) |
6a7f3631 | 1292 | { |
e9dcc305 NTND |
1293 | struct strbuf path = STRBUF_INIT; |
1294 | struct strbuf tmp = STRBUF_INIT; | |
1295 | struct rename_cb cb; | |
1296 | int ret; | |
6a7f3631 | 1297 | |
802de3da NTND |
1298 | files_reflog_path(refs, &path, newrefname); |
1299 | files_reflog_path(refs, &tmp, TMP_RENAMED_LOG); | |
e9dcc305 NTND |
1300 | cb.tmp_renamed_log = tmp.buf; |
1301 | ret = raceproof_create_file(path.buf, rename_tmp_log_callback, &cb); | |
6a7f3631 MH |
1302 | if (ret) { |
1303 | if (errno == EISDIR) | |
e9dcc305 | 1304 | error("directory not empty: %s", path.buf); |
6a7f3631 | 1305 | else |
990c98d2 | 1306 | error("unable to move logfile %s to %s: %s", |
e9dcc305 NTND |
1307 | tmp.buf, path.buf, |
1308 | strerror(cb.true_errno)); | |
7bd9bcf3 | 1309 | } |
6a7f3631 | 1310 | |
e9dcc305 NTND |
1311 | strbuf_release(&path); |
1312 | strbuf_release(&tmp); | |
7bd9bcf3 MH |
1313 | return ret; |
1314 | } | |
1315 | ||
7bd9bcf3 | 1316 | static int write_ref_to_lockfile(struct ref_lock *lock, |
4417df8c | 1317 | const struct object_id *oid, struct strbuf *err); |
f18a7892 MH |
1318 | static int commit_ref_update(struct files_ref_store *refs, |
1319 | struct ref_lock *lock, | |
4417df8c | 1320 | const struct object_id *oid, const char *logmsg, |
5d9b2de4 | 1321 | struct strbuf *err); |
7bd9bcf3 | 1322 | |
52d59cc6 | 1323 | static int files_copy_or_rename_ref(struct ref_store *ref_store, |
9b6b40d9 | 1324 | const char *oldrefname, const char *newrefname, |
52d59cc6 | 1325 | const char *logmsg, int copy) |
7bd9bcf3 | 1326 | { |
9b6b40d9 | 1327 | struct files_ref_store *refs = |
9e7ec634 | 1328 | files_downcast(ref_store, REF_STORE_WRITE, "rename_ref"); |
4417df8c | 1329 | struct object_id oid, orig_oid; |
7bd9bcf3 MH |
1330 | int flag = 0, logmoved = 0; |
1331 | struct ref_lock *lock; | |
1332 | struct stat loginfo; | |
e9dcc305 NTND |
1333 | struct strbuf sb_oldref = STRBUF_INIT; |
1334 | struct strbuf sb_newref = STRBUF_INIT; | |
1335 | struct strbuf tmp_renamed_log = STRBUF_INIT; | |
1336 | int log, ret; | |
7bd9bcf3 MH |
1337 | struct strbuf err = STRBUF_INIT; |
1338 | ||
802de3da NTND |
1339 | files_reflog_path(refs, &sb_oldref, oldrefname); |
1340 | files_reflog_path(refs, &sb_newref, newrefname); | |
1341 | files_reflog_path(refs, &tmp_renamed_log, TMP_RENAMED_LOG); | |
e9dcc305 NTND |
1342 | |
1343 | log = !lstat(sb_oldref.buf, &loginfo); | |
0a3f07d6 NTND |
1344 | if (log && S_ISLNK(loginfo.st_mode)) { |
1345 | ret = error("reflog for %s is a symlink", oldrefname); | |
1346 | goto out; | |
1347 | } | |
7bd9bcf3 | 1348 | |
2f40e954 NTND |
1349 | if (!refs_resolve_ref_unsafe(&refs->base, oldrefname, |
1350 | RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE, | |
49e61479 | 1351 | &orig_oid, &flag)) { |
0a3f07d6 NTND |
1352 | ret = error("refname %s not found", oldrefname); |
1353 | goto out; | |
1354 | } | |
e711b1af | 1355 | |
0a3f07d6 | 1356 | if (flag & REF_ISSYMREF) { |
52d59cc6 SD |
1357 | if (copy) |
1358 | ret = error("refname %s is a symbolic ref, copying it is not supported", | |
1359 | oldrefname); | |
1360 | else | |
1361 | ret = error("refname %s is a symbolic ref, renaming it is not supported", | |
1362 | oldrefname); | |
0a3f07d6 NTND |
1363 | goto out; |
1364 | } | |
7d2df051 | 1365 | if (!refs_rename_ref_available(&refs->base, oldrefname, newrefname)) { |
0a3f07d6 NTND |
1366 | ret = 1; |
1367 | goto out; | |
1368 | } | |
7bd9bcf3 | 1369 | |
52d59cc6 | 1370 | if (!copy && log && rename(sb_oldref.buf, tmp_renamed_log.buf)) { |
a5c1efd6 | 1371 | ret = error("unable to move logfile logs/%s to logs/"TMP_RENAMED_LOG": %s", |
0a3f07d6 NTND |
1372 | oldrefname, strerror(errno)); |
1373 | goto out; | |
1374 | } | |
7bd9bcf3 | 1375 | |
52d59cc6 SD |
1376 | if (copy && log && copy_file(tmp_renamed_log.buf, sb_oldref.buf, 0644)) { |
1377 | ret = error("unable to copy logfile logs/%s to logs/"TMP_RENAMED_LOG": %s", | |
1378 | oldrefname, strerror(errno)); | |
1379 | goto out; | |
1380 | } | |
1381 | ||
1382 | if (!copy && refs_delete_ref(&refs->base, logmsg, oldrefname, | |
91774afc | 1383 | &orig_oid, REF_NO_DEREF)) { |
7bd9bcf3 MH |
1384 | error("unable to delete old %s", oldrefname); |
1385 | goto rollback; | |
1386 | } | |
1387 | ||
12fd3496 | 1388 | /* |
4417df8c | 1389 | * Since we are doing a shallow lookup, oid is not the |
1390 | * correct value to pass to delete_ref as old_oid. But that | |
1391 | * doesn't matter, because an old_oid check wouldn't add to | |
12fd3496 DT |
1392 | * the safety anyway; we want to delete the reference whatever |
1393 | * its current value. | |
1394 | */ | |
52d59cc6 | 1395 | if (!copy && !refs_read_ref_full(&refs->base, newrefname, |
2f40e954 | 1396 | RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE, |
34c290a6 | 1397 | &oid, NULL) && |
2f40e954 | 1398 | refs_delete_ref(&refs->base, NULL, newrefname, |
91774afc | 1399 | NULL, REF_NO_DEREF)) { |
58364324 | 1400 | if (errno == EISDIR) { |
7bd9bcf3 MH |
1401 | struct strbuf path = STRBUF_INIT; |
1402 | int result; | |
1403 | ||
19e02f4f | 1404 | files_ref_path(refs, &path, newrefname); |
7bd9bcf3 MH |
1405 | result = remove_empty_directories(&path); |
1406 | strbuf_release(&path); | |
1407 | ||
1408 | if (result) { | |
1409 | error("Directory not empty: %s", newrefname); | |
1410 | goto rollback; | |
1411 | } | |
1412 | } else { | |
1413 | error("unable to delete existing %s", newrefname); | |
1414 | goto rollback; | |
1415 | } | |
1416 | } | |
1417 | ||
802de3da | 1418 | if (log && rename_tmp_log(refs, newrefname)) |
7bd9bcf3 MH |
1419 | goto rollback; |
1420 | ||
1421 | logmoved = log; | |
1422 | ||
4f01e508 | 1423 | lock = lock_ref_oid_basic(refs, newrefname, NULL, NULL, NULL, |
91774afc | 1424 | REF_NO_DEREF, NULL, &err); |
7bd9bcf3 | 1425 | if (!lock) { |
52d59cc6 SD |
1426 | if (copy) |
1427 | error("unable to copy '%s' to '%s': %s", oldrefname, newrefname, err.buf); | |
1428 | else | |
1429 | error("unable to rename '%s' to '%s': %s", oldrefname, newrefname, err.buf); | |
7bd9bcf3 MH |
1430 | strbuf_release(&err); |
1431 | goto rollback; | |
1432 | } | |
4417df8c | 1433 | oidcpy(&lock->old_oid, &orig_oid); |
7bd9bcf3 | 1434 | |
4417df8c | 1435 | if (write_ref_to_lockfile(lock, &orig_oid, &err) || |
1436 | commit_ref_update(refs, lock, &orig_oid, logmsg, &err)) { | |
7bd9bcf3 MH |
1437 | error("unable to write current sha1 into %s: %s", newrefname, err.buf); |
1438 | strbuf_release(&err); | |
1439 | goto rollback; | |
1440 | } | |
1441 | ||
0a3f07d6 NTND |
1442 | ret = 0; |
1443 | goto out; | |
7bd9bcf3 MH |
1444 | |
1445 | rollback: | |
4f01e508 | 1446 | lock = lock_ref_oid_basic(refs, oldrefname, NULL, NULL, NULL, |
91774afc | 1447 | REF_NO_DEREF, NULL, &err); |
7bd9bcf3 MH |
1448 | if (!lock) { |
1449 | error("unable to lock %s for rollback: %s", oldrefname, err.buf); | |
1450 | strbuf_release(&err); | |
1451 | goto rollbacklog; | |
1452 | } | |
1453 | ||
1454 | flag = log_all_ref_updates; | |
341fb286 | 1455 | log_all_ref_updates = LOG_REFS_NONE; |
4417df8c | 1456 | if (write_ref_to_lockfile(lock, &orig_oid, &err) || |
1457 | commit_ref_update(refs, lock, &orig_oid, NULL, &err)) { | |
7bd9bcf3 MH |
1458 | error("unable to write current sha1 into %s: %s", oldrefname, err.buf); |
1459 | strbuf_release(&err); | |
1460 | } | |
1461 | log_all_ref_updates = flag; | |
1462 | ||
1463 | rollbacklog: | |
e9dcc305 | 1464 | if (logmoved && rename(sb_newref.buf, sb_oldref.buf)) |
7bd9bcf3 MH |
1465 | error("unable to restore logfile %s from %s: %s", |
1466 | oldrefname, newrefname, strerror(errno)); | |
1467 | if (!logmoved && log && | |
e9dcc305 | 1468 | rename(tmp_renamed_log.buf, sb_oldref.buf)) |
a5c1efd6 | 1469 | error("unable to restore logfile %s from logs/"TMP_RENAMED_LOG": %s", |
7bd9bcf3 | 1470 | oldrefname, strerror(errno)); |
0a3f07d6 NTND |
1471 | ret = 1; |
1472 | out: | |
e9dcc305 NTND |
1473 | strbuf_release(&sb_newref); |
1474 | strbuf_release(&sb_oldref); | |
1475 | strbuf_release(&tmp_renamed_log); | |
1476 | ||
0a3f07d6 | 1477 | return ret; |
7bd9bcf3 MH |
1478 | } |
1479 | ||
52d59cc6 SD |
1480 | static int files_rename_ref(struct ref_store *ref_store, |
1481 | const char *oldrefname, const char *newrefname, | |
1482 | const char *logmsg) | |
1483 | { | |
1484 | return files_copy_or_rename_ref(ref_store, oldrefname, | |
1485 | newrefname, logmsg, 0); | |
1486 | } | |
1487 | ||
1488 | static int files_copy_ref(struct ref_store *ref_store, | |
1489 | const char *oldrefname, const char *newrefname, | |
1490 | const char *logmsg) | |
1491 | { | |
1492 | return files_copy_or_rename_ref(ref_store, oldrefname, | |
1493 | newrefname, logmsg, 1); | |
1494 | } | |
1495 | ||
83a3069a | 1496 | static int close_ref_gently(struct ref_lock *lock) |
7bd9bcf3 | 1497 | { |
ee4d8e45 | 1498 | if (close_lock_file_gently(&lock->lk)) |
7bd9bcf3 MH |
1499 | return -1; |
1500 | return 0; | |
1501 | } | |
1502 | ||
1503 | static int commit_ref(struct ref_lock *lock) | |
1504 | { | |
ee4d8e45 | 1505 | char *path = get_locked_file_path(&lock->lk); |
5387c0d8 MH |
1506 | struct stat st; |
1507 | ||
1508 | if (!lstat(path, &st) && S_ISDIR(st.st_mode)) { | |
1509 | /* | |
1510 | * There is a directory at the path we want to rename | |
1511 | * the lockfile to. Hopefully it is empty; try to | |
1512 | * delete it. | |
1513 | */ | |
1514 | size_t len = strlen(path); | |
1515 | struct strbuf sb_path = STRBUF_INIT; | |
1516 | ||
1517 | strbuf_attach(&sb_path, path, len, len); | |
1518 | ||
1519 | /* | |
1520 | * If this fails, commit_lock_file() will also fail | |
1521 | * and will report the problem. | |
1522 | */ | |
1523 | remove_empty_directories(&sb_path); | |
1524 | strbuf_release(&sb_path); | |
1525 | } else { | |
1526 | free(path); | |
1527 | } | |
1528 | ||
ee4d8e45 | 1529 | if (commit_lock_file(&lock->lk)) |
7bd9bcf3 MH |
1530 | return -1; |
1531 | return 0; | |
1532 | } | |
1533 | ||
1fb0c809 MH |
1534 | static int open_or_create_logfile(const char *path, void *cb) |
1535 | { | |
1536 | int *fd = cb; | |
1537 | ||
1538 | *fd = open(path, O_APPEND | O_WRONLY | O_CREAT, 0666); | |
1539 | return (*fd < 0) ? -1 : 0; | |
1540 | } | |
1541 | ||
7bd9bcf3 | 1542 | /* |
4533e534 MH |
1543 | * Create a reflog for a ref. If force_create = 0, only create the |
1544 | * reflog for certain refs (those for which should_autocreate_reflog | |
1545 | * returns non-zero). Otherwise, create it regardless of the reference | |
1546 | * name. If the logfile already existed or was created, return 0 and | |
1547 | * set *logfd to the file descriptor opened for appending to the file. | |
1548 | * If no logfile exists and we decided not to create one, return 0 and | |
1549 | * set *logfd to -1. On failure, fill in *err, set *logfd to -1, and | |
1550 | * return -1. | |
7bd9bcf3 | 1551 | */ |
802de3da NTND |
1552 | static int log_ref_setup(struct files_ref_store *refs, |
1553 | const char *refname, int force_create, | |
4533e534 | 1554 | int *logfd, struct strbuf *err) |
7bd9bcf3 | 1555 | { |
802de3da NTND |
1556 | struct strbuf logfile_sb = STRBUF_INIT; |
1557 | char *logfile; | |
1558 | ||
1559 | files_reflog_path(refs, &logfile_sb, refname); | |
1560 | logfile = strbuf_detach(&logfile_sb, NULL); | |
7bd9bcf3 | 1561 | |
7bd9bcf3 | 1562 | if (force_create || should_autocreate_reflog(refname)) { |
4533e534 | 1563 | if (raceproof_create_file(logfile, open_or_create_logfile, logfd)) { |
1fb0c809 MH |
1564 | if (errno == ENOENT) |
1565 | strbuf_addf(err, "unable to create directory for '%s': " | |
4533e534 | 1566 | "%s", logfile, strerror(errno)); |
1fb0c809 MH |
1567 | else if (errno == EISDIR) |
1568 | strbuf_addf(err, "there are still logs under '%s'", | |
4533e534 | 1569 | logfile); |
1fb0c809 | 1570 | else |
854bda6b | 1571 | strbuf_addf(err, "unable to append to '%s': %s", |
4533e534 | 1572 | logfile, strerror(errno)); |
7bd9bcf3 | 1573 | |
4533e534 | 1574 | goto error; |
7bd9bcf3 | 1575 | } |
854bda6b | 1576 | } else { |
4533e534 | 1577 | *logfd = open(logfile, O_APPEND | O_WRONLY, 0666); |
e404f459 | 1578 | if (*logfd < 0) { |
854bda6b MH |
1579 | if (errno == ENOENT || errno == EISDIR) { |
1580 | /* | |
1581 | * The logfile doesn't already exist, | |
1582 | * but that is not an error; it only | |
1583 | * means that we won't write log | |
1584 | * entries to it. | |
1585 | */ | |
1586 | ; | |
1587 | } else { | |
1588 | strbuf_addf(err, "unable to append to '%s': %s", | |
4533e534 MH |
1589 | logfile, strerror(errno)); |
1590 | goto error; | |
854bda6b | 1591 | } |
7bd9bcf3 MH |
1592 | } |
1593 | } | |
1594 | ||
e404f459 | 1595 | if (*logfd >= 0) |
4533e534 | 1596 | adjust_shared_perm(logfile); |
854bda6b | 1597 | |
4533e534 | 1598 | free(logfile); |
7bd9bcf3 | 1599 | return 0; |
7bd9bcf3 | 1600 | |
4533e534 MH |
1601 | error: |
1602 | free(logfile); | |
1603 | return -1; | |
7bd9bcf3 | 1604 | } |
7bd9bcf3 | 1605 | |
e3688bd6 DT |
1606 | static int files_create_reflog(struct ref_store *ref_store, |
1607 | const char *refname, int force_create, | |
1608 | struct strbuf *err) | |
7bd9bcf3 | 1609 | { |
802de3da | 1610 | struct files_ref_store *refs = |
9e7ec634 | 1611 | files_downcast(ref_store, REF_STORE_WRITE, "create_reflog"); |
e404f459 | 1612 | int fd; |
7bd9bcf3 | 1613 | |
802de3da | 1614 | if (log_ref_setup(refs, refname, force_create, &fd, err)) |
4533e534 MH |
1615 | return -1; |
1616 | ||
e404f459 MH |
1617 | if (fd >= 0) |
1618 | close(fd); | |
4533e534 MH |
1619 | |
1620 | return 0; | |
7bd9bcf3 MH |
1621 | } |
1622 | ||
4417df8c | 1623 | static int log_ref_write_fd(int fd, const struct object_id *old_oid, |
1624 | const struct object_id *new_oid, | |
7bd9bcf3 MH |
1625 | const char *committer, const char *msg) |
1626 | { | |
80a6c207 BP |
1627 | struct strbuf sb = STRBUF_INIT; |
1628 | int ret = 0; | |
1629 | ||
1630 | strbuf_addf(&sb, "%s %s %s", oid_to_hex(old_oid), oid_to_hex(new_oid), committer); | |
1631 | if (msg && *msg) | |
1632 | copy_reflog_msg(&sb, msg); | |
1633 | strbuf_addch(&sb, '\n'); | |
1634 | if (write_in_full(fd, sb.buf, sb.len) < 0) | |
1635 | ret = -1; | |
1636 | strbuf_release(&sb); | |
1637 | return ret; | |
7bd9bcf3 MH |
1638 | } |
1639 | ||
802de3da | 1640 | static int files_log_ref_write(struct files_ref_store *refs, |
4417df8c | 1641 | const char *refname, const struct object_id *old_oid, |
1642 | const struct object_id *new_oid, const char *msg, | |
11f8457f | 1643 | int flags, struct strbuf *err) |
7bd9bcf3 | 1644 | { |
e404f459 | 1645 | int logfd, result; |
7bd9bcf3 | 1646 | |
341fb286 CW |
1647 | if (log_all_ref_updates == LOG_REFS_UNSET) |
1648 | log_all_ref_updates = is_bare_repository() ? LOG_REFS_NONE : LOG_REFS_NORMAL; | |
7bd9bcf3 | 1649 | |
802de3da NTND |
1650 | result = log_ref_setup(refs, refname, |
1651 | flags & REF_FORCE_CREATE_REFLOG, | |
4533e534 | 1652 | &logfd, err); |
7bd9bcf3 MH |
1653 | |
1654 | if (result) | |
1655 | return result; | |
1656 | ||
7bd9bcf3 MH |
1657 | if (logfd < 0) |
1658 | return 0; | |
4417df8c | 1659 | result = log_ref_write_fd(logfd, old_oid, new_oid, |
7bd9bcf3 MH |
1660 | git_committer_info(0), msg); |
1661 | if (result) { | |
e9dcc305 | 1662 | struct strbuf sb = STRBUF_INIT; |
87b21e05 MH |
1663 | int save_errno = errno; |
1664 | ||
802de3da | 1665 | files_reflog_path(refs, &sb, refname); |
87b21e05 | 1666 | strbuf_addf(err, "unable to append to '%s': %s", |
e9dcc305 NTND |
1667 | sb.buf, strerror(save_errno)); |
1668 | strbuf_release(&sb); | |
7bd9bcf3 MH |
1669 | close(logfd); |
1670 | return -1; | |
1671 | } | |
1672 | if (close(logfd)) { | |
e9dcc305 | 1673 | struct strbuf sb = STRBUF_INIT; |
87b21e05 MH |
1674 | int save_errno = errno; |
1675 | ||
802de3da | 1676 | files_reflog_path(refs, &sb, refname); |
87b21e05 | 1677 | strbuf_addf(err, "unable to append to '%s': %s", |
e9dcc305 NTND |
1678 | sb.buf, strerror(save_errno)); |
1679 | strbuf_release(&sb); | |
7bd9bcf3 MH |
1680 | return -1; |
1681 | } | |
1682 | return 0; | |
1683 | } | |
1684 | ||
7bd9bcf3 | 1685 | /* |
78fb4579 MH |
1686 | * Write oid into the open lockfile, then close the lockfile. On |
1687 | * errors, rollback the lockfile, fill in *err and return -1. | |
7bd9bcf3 MH |
1688 | */ |
1689 | static int write_ref_to_lockfile(struct ref_lock *lock, | |
4417df8c | 1690 | const struct object_id *oid, struct strbuf *err) |
7bd9bcf3 MH |
1691 | { |
1692 | static char term = '\n'; | |
1693 | struct object *o; | |
1694 | int fd; | |
1695 | ||
109cd76d | 1696 | o = parse_object(the_repository, oid); |
7bd9bcf3 MH |
1697 | if (!o) { |
1698 | strbuf_addf(err, | |
0568c8e9 | 1699 | "trying to write ref '%s' with nonexistent object %s", |
4417df8c | 1700 | lock->ref_name, oid_to_hex(oid)); |
7bd9bcf3 MH |
1701 | unlock_ref(lock); |
1702 | return -1; | |
1703 | } | |
1704 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1705 | strbuf_addf(err, | |
0568c8e9 | 1706 | "trying to write non-commit object %s to branch '%s'", |
4417df8c | 1707 | oid_to_hex(oid), lock->ref_name); |
7bd9bcf3 MH |
1708 | unlock_ref(lock); |
1709 | return -1; | |
1710 | } | |
ee4d8e45 | 1711 | fd = get_lock_file_fd(&lock->lk); |
2ae2e2a1 | 1712 | if (write_in_full(fd, oid_to_hex(oid), the_hash_algo->hexsz) < 0 || |
06f46f23 | 1713 | write_in_full(fd, &term, 1) < 0 || |
83a3069a | 1714 | close_ref_gently(lock) < 0) { |
7bd9bcf3 | 1715 | strbuf_addf(err, |
ee4d8e45 | 1716 | "couldn't write '%s'", get_lock_file_path(&lock->lk)); |
7bd9bcf3 MH |
1717 | unlock_ref(lock); |
1718 | return -1; | |
1719 | } | |
1720 | return 0; | |
1721 | } | |
1722 | ||
1723 | /* | |
1724 | * Commit a change to a loose reference that has already been written | |
1725 | * to the loose reference lockfile. Also update the reflogs if | |
1726 | * necessary, using the specified lockmsg (which can be NULL). | |
1727 | */ | |
f18a7892 MH |
1728 | static int commit_ref_update(struct files_ref_store *refs, |
1729 | struct ref_lock *lock, | |
4417df8c | 1730 | const struct object_id *oid, const char *logmsg, |
5d9b2de4 | 1731 | struct strbuf *err) |
7bd9bcf3 | 1732 | { |
32c597e7 | 1733 | files_assert_main_repository(refs, "commit_ref_update"); |
00eebe35 MH |
1734 | |
1735 | clear_loose_ref_cache(refs); | |
802de3da | 1736 | if (files_log_ref_write(refs, lock->ref_name, |
4417df8c | 1737 | &lock->old_oid, oid, |
81b1b6d4 | 1738 | logmsg, 0, err)) { |
7bd9bcf3 | 1739 | char *old_msg = strbuf_detach(err, NULL); |
0568c8e9 | 1740 | strbuf_addf(err, "cannot update the ref '%s': %s", |
7bd9bcf3 MH |
1741 | lock->ref_name, old_msg); |
1742 | free(old_msg); | |
1743 | unlock_ref(lock); | |
1744 | return -1; | |
1745 | } | |
7a418f3a MH |
1746 | |
1747 | if (strcmp(lock->ref_name, "HEAD") != 0) { | |
7bd9bcf3 MH |
1748 | /* |
1749 | * Special hack: If a branch is updated directly and HEAD | |
1750 | * points to it (may happen on the remote side of a push | |
1751 | * for example) then logically the HEAD reflog should be | |
1752 | * updated too. | |
1753 | * A generic solution implies reverse symref information, | |
1754 | * but finding all symrefs pointing to the given branch | |
1755 | * would be rather costly for this rare event (the direct | |
1756 | * update of a branch) to be worth it. So let's cheat and | |
1757 | * check with HEAD only which should cover 99% of all usage | |
1758 | * scenarios (even 100% of the default ones). | |
1759 | */ | |
7bd9bcf3 MH |
1760 | int head_flag; |
1761 | const char *head_ref; | |
7a418f3a | 1762 | |
2f40e954 NTND |
1763 | head_ref = refs_resolve_ref_unsafe(&refs->base, "HEAD", |
1764 | RESOLVE_REF_READING, | |
e691b027 | 1765 | NULL, &head_flag); |
7bd9bcf3 MH |
1766 | if (head_ref && (head_flag & REF_ISSYMREF) && |
1767 | !strcmp(head_ref, lock->ref_name)) { | |
1768 | struct strbuf log_err = STRBUF_INIT; | |
802de3da | 1769 | if (files_log_ref_write(refs, "HEAD", |
4417df8c | 1770 | &lock->old_oid, oid, |
802de3da | 1771 | logmsg, 0, &log_err)) { |
7bd9bcf3 MH |
1772 | error("%s", log_err.buf); |
1773 | strbuf_release(&log_err); | |
1774 | } | |
1775 | } | |
1776 | } | |
7a418f3a | 1777 | |
7bd9bcf3 | 1778 | if (commit_ref(lock)) { |
0568c8e9 | 1779 | strbuf_addf(err, "couldn't set '%s'", lock->ref_name); |
7bd9bcf3 MH |
1780 | unlock_ref(lock); |
1781 | return -1; | |
1782 | } | |
1783 | ||
1784 | unlock_ref(lock); | |
1785 | return 0; | |
1786 | } | |
1787 | ||
370e5ad6 | 1788 | static int create_ref_symlink(struct ref_lock *lock, const char *target) |
7bd9bcf3 | 1789 | { |
370e5ad6 | 1790 | int ret = -1; |
7bd9bcf3 | 1791 | #ifndef NO_SYMLINK_HEAD |
ee4d8e45 | 1792 | char *ref_path = get_locked_file_path(&lock->lk); |
370e5ad6 JK |
1793 | unlink(ref_path); |
1794 | ret = symlink(target, ref_path); | |
1795 | free(ref_path); | |
1796 | ||
1797 | if (ret) | |
7bd9bcf3 | 1798 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
7bd9bcf3 | 1799 | #endif |
370e5ad6 JK |
1800 | return ret; |
1801 | } | |
7bd9bcf3 | 1802 | |
802de3da NTND |
1803 | static void update_symref_reflog(struct files_ref_store *refs, |
1804 | struct ref_lock *lock, const char *refname, | |
370e5ad6 JK |
1805 | const char *target, const char *logmsg) |
1806 | { | |
1807 | struct strbuf err = STRBUF_INIT; | |
4417df8c | 1808 | struct object_id new_oid; |
2f40e954 NTND |
1809 | if (logmsg && |
1810 | !refs_read_ref_full(&refs->base, target, | |
34c290a6 | 1811 | RESOLVE_REF_READING, &new_oid, NULL) && |
4417df8c | 1812 | files_log_ref_write(refs, refname, &lock->old_oid, |
1813 | &new_oid, logmsg, 0, &err)) { | |
7bd9bcf3 MH |
1814 | error("%s", err.buf); |
1815 | strbuf_release(&err); | |
1816 | } | |
370e5ad6 | 1817 | } |
7bd9bcf3 | 1818 | |
802de3da NTND |
1819 | static int create_symref_locked(struct files_ref_store *refs, |
1820 | struct ref_lock *lock, const char *refname, | |
370e5ad6 JK |
1821 | const char *target, const char *logmsg) |
1822 | { | |
1823 | if (prefer_symlink_refs && !create_ref_symlink(lock, target)) { | |
802de3da | 1824 | update_symref_reflog(refs, lock, refname, target, logmsg); |
370e5ad6 JK |
1825 | return 0; |
1826 | } | |
1827 | ||
ee4d8e45 | 1828 | if (!fdopen_lock_file(&lock->lk, "w")) |
370e5ad6 | 1829 | return error("unable to fdopen %s: %s", |
ee4d8e45 | 1830 | lock->lk.tempfile->filename.buf, strerror(errno)); |
370e5ad6 | 1831 | |
802de3da | 1832 | update_symref_reflog(refs, lock, refname, target, logmsg); |
396da8f7 | 1833 | |
370e5ad6 | 1834 | /* no error check; commit_ref will check ferror */ |
ee4d8e45 | 1835 | fprintf(lock->lk.tempfile->fp, "ref: %s\n", target); |
370e5ad6 JK |
1836 | if (commit_ref(lock) < 0) |
1837 | return error("unable to write symref for %s: %s", refname, | |
1838 | strerror(errno)); | |
7bd9bcf3 MH |
1839 | return 0; |
1840 | } | |
1841 | ||
284689ba MH |
1842 | static int files_create_symref(struct ref_store *ref_store, |
1843 | const char *refname, const char *target, | |
1844 | const char *logmsg) | |
370e5ad6 | 1845 | { |
7eb27cdf | 1846 | struct files_ref_store *refs = |
9e7ec634 | 1847 | files_downcast(ref_store, REF_STORE_WRITE, "create_symref"); |
370e5ad6 JK |
1848 | struct strbuf err = STRBUF_INIT; |
1849 | struct ref_lock *lock; | |
1850 | int ret; | |
1851 | ||
4f01e508 | 1852 | lock = lock_ref_oid_basic(refs, refname, NULL, |
91774afc | 1853 | NULL, NULL, REF_NO_DEREF, NULL, |
4f01e508 | 1854 | &err); |
370e5ad6 JK |
1855 | if (!lock) { |
1856 | error("%s", err.buf); | |
1857 | strbuf_release(&err); | |
1858 | return -1; | |
1859 | } | |
1860 | ||
802de3da | 1861 | ret = create_symref_locked(refs, lock, refname, target, logmsg); |
370e5ad6 JK |
1862 | unlock_ref(lock); |
1863 | return ret; | |
1864 | } | |
1865 | ||
e3688bd6 DT |
1866 | static int files_reflog_exists(struct ref_store *ref_store, |
1867 | const char *refname) | |
7bd9bcf3 | 1868 | { |
802de3da | 1869 | struct files_ref_store *refs = |
9e7ec634 | 1870 | files_downcast(ref_store, REF_STORE_READ, "reflog_exists"); |
e9dcc305 | 1871 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 | 1872 | struct stat st; |
e9dcc305 | 1873 | int ret; |
7bd9bcf3 | 1874 | |
802de3da | 1875 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
1876 | ret = !lstat(sb.buf, &st) && S_ISREG(st.st_mode); |
1877 | strbuf_release(&sb); | |
1878 | return ret; | |
7bd9bcf3 MH |
1879 | } |
1880 | ||
e3688bd6 DT |
1881 | static int files_delete_reflog(struct ref_store *ref_store, |
1882 | const char *refname) | |
7bd9bcf3 | 1883 | { |
802de3da | 1884 | struct files_ref_store *refs = |
9e7ec634 | 1885 | files_downcast(ref_store, REF_STORE_WRITE, "delete_reflog"); |
e9dcc305 NTND |
1886 | struct strbuf sb = STRBUF_INIT; |
1887 | int ret; | |
1888 | ||
802de3da | 1889 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
1890 | ret = remove_path(sb.buf); |
1891 | strbuf_release(&sb); | |
1892 | return ret; | |
7bd9bcf3 MH |
1893 | } |
1894 | ||
1895 | static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data) | |
1896 | { | |
9461d272 | 1897 | struct object_id ooid, noid; |
7bd9bcf3 | 1898 | char *email_end, *message; |
dddbad72 | 1899 | timestamp_t timestamp; |
7bd9bcf3 | 1900 | int tz; |
43bc3b6c | 1901 | const char *p = sb->buf; |
7bd9bcf3 MH |
1902 | |
1903 | /* old SP new SP name <email> SP time TAB msg LF */ | |
43bc3b6c | 1904 | if (!sb->len || sb->buf[sb->len - 1] != '\n' || |
1905 | parse_oid_hex(p, &ooid, &p) || *p++ != ' ' || | |
1906 | parse_oid_hex(p, &noid, &p) || *p++ != ' ' || | |
1907 | !(email_end = strchr(p, '>')) || | |
7bd9bcf3 | 1908 | email_end[1] != ' ' || |
1aeb7e75 | 1909 | !(timestamp = parse_timestamp(email_end + 2, &message, 10)) || |
7bd9bcf3 MH |
1910 | !message || message[0] != ' ' || |
1911 | (message[1] != '+' && message[1] != '-') || | |
1912 | !isdigit(message[2]) || !isdigit(message[3]) || | |
1913 | !isdigit(message[4]) || !isdigit(message[5])) | |
1914 | return 0; /* corrupt? */ | |
1915 | email_end[1] = '\0'; | |
1916 | tz = strtol(message + 1, NULL, 10); | |
1917 | if (message[6] != '\t') | |
1918 | message += 6; | |
1919 | else | |
1920 | message += 7; | |
43bc3b6c | 1921 | return fn(&ooid, &noid, p, timestamp, tz, message, cb_data); |
7bd9bcf3 MH |
1922 | } |
1923 | ||
1924 | static char *find_beginning_of_line(char *bob, char *scan) | |
1925 | { | |
1926 | while (bob < scan && *(--scan) != '\n') | |
1927 | ; /* keep scanning backwards */ | |
1928 | /* | |
1929 | * Return either beginning of the buffer, or LF at the end of | |
1930 | * the previous line. | |
1931 | */ | |
1932 | return scan; | |
1933 | } | |
1934 | ||
e3688bd6 DT |
1935 | static int files_for_each_reflog_ent_reverse(struct ref_store *ref_store, |
1936 | const char *refname, | |
1937 | each_reflog_ent_fn fn, | |
1938 | void *cb_data) | |
7bd9bcf3 | 1939 | { |
802de3da | 1940 | struct files_ref_store *refs = |
9e7ec634 NTND |
1941 | files_downcast(ref_store, REF_STORE_READ, |
1942 | "for_each_reflog_ent_reverse"); | |
7bd9bcf3 MH |
1943 | struct strbuf sb = STRBUF_INIT; |
1944 | FILE *logfp; | |
1945 | long pos; | |
1946 | int ret = 0, at_tail = 1; | |
1947 | ||
802de3da | 1948 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
1949 | logfp = fopen(sb.buf, "r"); |
1950 | strbuf_release(&sb); | |
7bd9bcf3 MH |
1951 | if (!logfp) |
1952 | return -1; | |
1953 | ||
1954 | /* Jump to the end */ | |
1955 | if (fseek(logfp, 0, SEEK_END) < 0) | |
be686f03 RS |
1956 | ret = error("cannot seek back reflog for %s: %s", |
1957 | refname, strerror(errno)); | |
7bd9bcf3 MH |
1958 | pos = ftell(logfp); |
1959 | while (!ret && 0 < pos) { | |
1960 | int cnt; | |
1961 | size_t nread; | |
1962 | char buf[BUFSIZ]; | |
1963 | char *endp, *scanp; | |
1964 | ||
1965 | /* Fill next block from the end */ | |
1966 | cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos; | |
be686f03 RS |
1967 | if (fseek(logfp, pos - cnt, SEEK_SET)) { |
1968 | ret = error("cannot seek back reflog for %s: %s", | |
1969 | refname, strerror(errno)); | |
1970 | break; | |
1971 | } | |
7bd9bcf3 | 1972 | nread = fread(buf, cnt, 1, logfp); |
be686f03 RS |
1973 | if (nread != 1) { |
1974 | ret = error("cannot read %d bytes from reflog for %s: %s", | |
1975 | cnt, refname, strerror(errno)); | |
1976 | break; | |
1977 | } | |
7bd9bcf3 MH |
1978 | pos -= cnt; |
1979 | ||
1980 | scanp = endp = buf + cnt; | |
1981 | if (at_tail && scanp[-1] == '\n') | |
1982 | /* Looking at the final LF at the end of the file */ | |
1983 | scanp--; | |
1984 | at_tail = 0; | |
1985 | ||
1986 | while (buf < scanp) { | |
1987 | /* | |
1988 | * terminating LF of the previous line, or the beginning | |
1989 | * of the buffer. | |
1990 | */ | |
1991 | char *bp; | |
1992 | ||
1993 | bp = find_beginning_of_line(buf, scanp); | |
1994 | ||
1995 | if (*bp == '\n') { | |
1996 | /* | |
1997 | * The newline is the end of the previous line, | |
1998 | * so we know we have complete line starting | |
1999 | * at (bp + 1). Prefix it onto any prior data | |
2000 | * we collected for the line and process it. | |
2001 | */ | |
2002 | strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1)); | |
2003 | scanp = bp; | |
2004 | endp = bp + 1; | |
2005 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
2006 | strbuf_reset(&sb); | |
2007 | if (ret) | |
2008 | break; | |
2009 | } else if (!pos) { | |
2010 | /* | |
2011 | * We are at the start of the buffer, and the | |
2012 | * start of the file; there is no previous | |
2013 | * line, and we have everything for this one. | |
2014 | * Process it, and we can end the loop. | |
2015 | */ | |
2016 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
2017 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
2018 | strbuf_reset(&sb); | |
2019 | break; | |
2020 | } | |
2021 | ||
2022 | if (bp == buf) { | |
2023 | /* | |
2024 | * We are at the start of the buffer, and there | |
2025 | * is more file to read backwards. Which means | |
2026 | * we are in the middle of a line. Note that we | |
2027 | * may get here even if *bp was a newline; that | |
2028 | * just means we are at the exact end of the | |
2029 | * previous line, rather than some spot in the | |
2030 | * middle. | |
2031 | * | |
2032 | * Save away what we have to be combined with | |
2033 | * the data from the next read. | |
2034 | */ | |
2035 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
2036 | break; | |
2037 | } | |
2038 | } | |
2039 | ||
2040 | } | |
2041 | if (!ret && sb.len) | |
033abf97 | 2042 | BUG("reverse reflog parser had leftover data"); |
7bd9bcf3 MH |
2043 | |
2044 | fclose(logfp); | |
2045 | strbuf_release(&sb); | |
2046 | return ret; | |
2047 | } | |
2048 | ||
e3688bd6 DT |
2049 | static int files_for_each_reflog_ent(struct ref_store *ref_store, |
2050 | const char *refname, | |
2051 | each_reflog_ent_fn fn, void *cb_data) | |
7bd9bcf3 | 2052 | { |
802de3da | 2053 | struct files_ref_store *refs = |
9e7ec634 NTND |
2054 | files_downcast(ref_store, REF_STORE_READ, |
2055 | "for_each_reflog_ent"); | |
7bd9bcf3 MH |
2056 | FILE *logfp; |
2057 | struct strbuf sb = STRBUF_INIT; | |
2058 | int ret = 0; | |
2059 | ||
802de3da | 2060 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
2061 | logfp = fopen(sb.buf, "r"); |
2062 | strbuf_release(&sb); | |
7bd9bcf3 MH |
2063 | if (!logfp) |
2064 | return -1; | |
2065 | ||
2066 | while (!ret && !strbuf_getwholeline(&sb, logfp, '\n')) | |
2067 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
2068 | fclose(logfp); | |
2069 | strbuf_release(&sb); | |
2070 | return ret; | |
2071 | } | |
7bd9bcf3 | 2072 | |
2880d16f MH |
2073 | struct files_reflog_iterator { |
2074 | struct ref_iterator base; | |
7bd9bcf3 | 2075 | |
2f40e954 | 2076 | struct ref_store *ref_store; |
2880d16f MH |
2077 | struct dir_iterator *dir_iterator; |
2078 | struct object_id oid; | |
2079 | }; | |
7bd9bcf3 | 2080 | |
2880d16f MH |
2081 | static int files_reflog_iterator_advance(struct ref_iterator *ref_iterator) |
2082 | { | |
2083 | struct files_reflog_iterator *iter = | |
2084 | (struct files_reflog_iterator *)ref_iterator; | |
2085 | struct dir_iterator *diter = iter->dir_iterator; | |
2086 | int ok; | |
2087 | ||
2088 | while ((ok = dir_iterator_advance(diter)) == ITER_OK) { | |
2089 | int flags; | |
2090 | ||
2091 | if (!S_ISREG(diter->st.st_mode)) | |
7bd9bcf3 | 2092 | continue; |
2880d16f MH |
2093 | if (diter->basename[0] == '.') |
2094 | continue; | |
2095 | if (ends_with(diter->basename, ".lock")) | |
7bd9bcf3 | 2096 | continue; |
7bd9bcf3 | 2097 | |
2f40e954 NTND |
2098 | if (refs_read_ref_full(iter->ref_store, |
2099 | diter->relative_path, 0, | |
34c290a6 | 2100 | &iter->oid, &flags)) { |
2880d16f MH |
2101 | error("bad ref for %s", diter->path.buf); |
2102 | continue; | |
7bd9bcf3 | 2103 | } |
2880d16f MH |
2104 | |
2105 | iter->base.refname = diter->relative_path; | |
2106 | iter->base.oid = &iter->oid; | |
2107 | iter->base.flags = flags; | |
2108 | return ITER_OK; | |
7bd9bcf3 | 2109 | } |
2880d16f MH |
2110 | |
2111 | iter->dir_iterator = NULL; | |
2112 | if (ref_iterator_abort(ref_iterator) == ITER_ERROR) | |
2113 | ok = ITER_ERROR; | |
2114 | return ok; | |
2115 | } | |
2116 | ||
2117 | static int files_reflog_iterator_peel(struct ref_iterator *ref_iterator, | |
2118 | struct object_id *peeled) | |
2119 | { | |
033abf97 | 2120 | BUG("ref_iterator_peel() called for reflog_iterator"); |
2880d16f MH |
2121 | } |
2122 | ||
2123 | static int files_reflog_iterator_abort(struct ref_iterator *ref_iterator) | |
2124 | { | |
2125 | struct files_reflog_iterator *iter = | |
2126 | (struct files_reflog_iterator *)ref_iterator; | |
2127 | int ok = ITER_DONE; | |
2128 | ||
2129 | if (iter->dir_iterator) | |
2130 | ok = dir_iterator_abort(iter->dir_iterator); | |
2131 | ||
2132 | base_ref_iterator_free(ref_iterator); | |
2133 | return ok; | |
2134 | } | |
2135 | ||
2136 | static struct ref_iterator_vtable files_reflog_iterator_vtable = { | |
2137 | files_reflog_iterator_advance, | |
2138 | files_reflog_iterator_peel, | |
2139 | files_reflog_iterator_abort | |
2140 | }; | |
2141 | ||
944b4e30 NTND |
2142 | static struct ref_iterator *reflog_iterator_begin(struct ref_store *ref_store, |
2143 | const char *gitdir) | |
2880d16f MH |
2144 | { |
2145 | struct files_reflog_iterator *iter = xcalloc(1, sizeof(*iter)); | |
2146 | struct ref_iterator *ref_iterator = &iter->base; | |
e9dcc305 | 2147 | struct strbuf sb = STRBUF_INIT; |
2880d16f | 2148 | |
8738a8a4 | 2149 | base_ref_iterator_init(ref_iterator, &files_reflog_iterator_vtable, 0); |
944b4e30 | 2150 | strbuf_addf(&sb, "%s/logs", gitdir); |
e9dcc305 | 2151 | iter->dir_iterator = dir_iterator_begin(sb.buf); |
2f40e954 | 2152 | iter->ref_store = ref_store; |
e9dcc305 | 2153 | strbuf_release(&sb); |
944b4e30 | 2154 | |
2880d16f | 2155 | return ref_iterator; |
7bd9bcf3 MH |
2156 | } |
2157 | ||
944b4e30 NTND |
2158 | static enum iterator_selection reflog_iterator_select( |
2159 | struct ref_iterator *iter_worktree, | |
2160 | struct ref_iterator *iter_common, | |
2161 | void *cb_data) | |
2162 | { | |
2163 | if (iter_worktree) { | |
2164 | /* | |
2165 | * We're a bit loose here. We probably should ignore | |
2166 | * common refs if they are accidentally added as | |
2167 | * per-worktree refs. | |
2168 | */ | |
2169 | return ITER_SELECT_0; | |
2170 | } else if (iter_common) { | |
2171 | if (ref_type(iter_common->refname) == REF_TYPE_NORMAL) | |
2172 | return ITER_SELECT_1; | |
2173 | ||
2174 | /* | |
2175 | * The main ref store may contain main worktree's | |
2176 | * per-worktree refs, which should be ignored | |
2177 | */ | |
2178 | return ITER_SKIP_1; | |
2179 | } else | |
2180 | return ITER_DONE; | |
2181 | } | |
2182 | ||
2183 | static struct ref_iterator *files_reflog_iterator_begin(struct ref_store *ref_store) | |
2184 | { | |
2185 | struct files_ref_store *refs = | |
2186 | files_downcast(ref_store, REF_STORE_READ, | |
2187 | "reflog_iterator_begin"); | |
2188 | ||
2189 | if (!strcmp(refs->gitdir, refs->gitcommondir)) { | |
2190 | return reflog_iterator_begin(ref_store, refs->gitcommondir); | |
2191 | } else { | |
2192 | return merge_ref_iterator_begin( | |
1a2e1a76 | 2193 | 0, |
944b4e30 NTND |
2194 | reflog_iterator_begin(ref_store, refs->gitdir), |
2195 | reflog_iterator_begin(ref_store, refs->gitcommondir), | |
2196 | reflog_iterator_select, refs); | |
2197 | } | |
2198 | } | |
2199 | ||
165056b2 | 2200 | /* |
92b1551b MH |
2201 | * If update is a direct update of head_ref (the reference pointed to |
2202 | * by HEAD), then add an extra REF_LOG_ONLY update for HEAD. | |
2203 | */ | |
2204 | static int split_head_update(struct ref_update *update, | |
2205 | struct ref_transaction *transaction, | |
2206 | const char *head_ref, | |
2207 | struct string_list *affected_refnames, | |
2208 | struct strbuf *err) | |
2209 | { | |
2210 | struct string_list_item *item; | |
2211 | struct ref_update *new_update; | |
2212 | ||
2213 | if ((update->flags & REF_LOG_ONLY) || | |
acedcde7 | 2214 | (update->flags & REF_IS_PRUNING) || |
92b1551b MH |
2215 | (update->flags & REF_UPDATE_VIA_HEAD)) |
2216 | return 0; | |
2217 | ||
2218 | if (strcmp(update->refname, head_ref)) | |
2219 | return 0; | |
2220 | ||
2221 | /* | |
2222 | * First make sure that HEAD is not already in the | |
276d0e35 | 2223 | * transaction. This check is O(lg N) in the transaction |
92b1551b MH |
2224 | * size, but it happens at most once per transaction. |
2225 | */ | |
276d0e35 | 2226 | if (string_list_has_string(affected_refnames, "HEAD")) { |
92b1551b MH |
2227 | /* An entry already existed */ |
2228 | strbuf_addf(err, | |
2229 | "multiple updates for 'HEAD' (including one " | |
2230 | "via its referent '%s') are not allowed", | |
2231 | update->refname); | |
2232 | return TRANSACTION_NAME_CONFLICT; | |
2233 | } | |
2234 | ||
2235 | new_update = ref_transaction_add_update( | |
2236 | transaction, "HEAD", | |
91774afc | 2237 | update->flags | REF_LOG_ONLY | REF_NO_DEREF, |
89f3bbdd | 2238 | &update->new_oid, &update->old_oid, |
92b1551b MH |
2239 | update->msg); |
2240 | ||
276d0e35 MÅ |
2241 | /* |
2242 | * Add "HEAD". This insertion is O(N) in the transaction | |
2243 | * size, but it happens at most once per transaction. | |
2244 | * Add new_update->refname instead of a literal "HEAD". | |
2245 | */ | |
2246 | if (strcmp(new_update->refname, "HEAD")) | |
2247 | BUG("%s unexpectedly not 'HEAD'", new_update->refname); | |
2248 | item = string_list_insert(affected_refnames, new_update->refname); | |
92b1551b MH |
2249 | item->util = new_update; |
2250 | ||
2251 | return 0; | |
2252 | } | |
2253 | ||
2254 | /* | |
2255 | * update is for a symref that points at referent and doesn't have | |
91774afc MH |
2256 | * REF_NO_DEREF set. Split it into two updates: |
2257 | * - The original update, but with REF_LOG_ONLY and REF_NO_DEREF set | |
92b1551b MH |
2258 | * - A new, separate update for the referent reference |
2259 | * Note that the new update will itself be subject to splitting when | |
2260 | * the iteration gets to it. | |
2261 | */ | |
fcc42ea0 MH |
2262 | static int split_symref_update(struct files_ref_store *refs, |
2263 | struct ref_update *update, | |
92b1551b MH |
2264 | const char *referent, |
2265 | struct ref_transaction *transaction, | |
2266 | struct string_list *affected_refnames, | |
2267 | struct strbuf *err) | |
2268 | { | |
2269 | struct string_list_item *item; | |
2270 | struct ref_update *new_update; | |
2271 | unsigned int new_flags; | |
2272 | ||
2273 | /* | |
2274 | * First make sure that referent is not already in the | |
c299468b | 2275 | * transaction. This check is O(lg N) in the transaction |
92b1551b MH |
2276 | * size, but it happens at most once per symref in a |
2277 | * transaction. | |
2278 | */ | |
c299468b MÅ |
2279 | if (string_list_has_string(affected_refnames, referent)) { |
2280 | /* An entry already exists */ | |
92b1551b MH |
2281 | strbuf_addf(err, |
2282 | "multiple updates for '%s' (including one " | |
2283 | "via symref '%s') are not allowed", | |
2284 | referent, update->refname); | |
2285 | return TRANSACTION_NAME_CONFLICT; | |
2286 | } | |
2287 | ||
2288 | new_flags = update->flags; | |
2289 | if (!strcmp(update->refname, "HEAD")) { | |
2290 | /* | |
2291 | * Record that the new update came via HEAD, so that | |
2292 | * when we process it, split_head_update() doesn't try | |
2293 | * to add another reflog update for HEAD. Note that | |
2294 | * this bit will be propagated if the new_update | |
2295 | * itself needs to be split. | |
2296 | */ | |
2297 | new_flags |= REF_UPDATE_VIA_HEAD; | |
2298 | } | |
2299 | ||
2300 | new_update = ref_transaction_add_update( | |
2301 | transaction, referent, new_flags, | |
89f3bbdd | 2302 | &update->new_oid, &update->old_oid, |
92b1551b MH |
2303 | update->msg); |
2304 | ||
6e30b2f6 MH |
2305 | new_update->parent_update = update; |
2306 | ||
2307 | /* | |
2308 | * Change the symbolic ref update to log only. Also, it | |
78fb4579 | 2309 | * doesn't need to check its old OID value, as that will be |
6e30b2f6 MH |
2310 | * done when new_update is processed. |
2311 | */ | |
91774afc | 2312 | update->flags |= REF_LOG_ONLY | REF_NO_DEREF; |
6e30b2f6 | 2313 | update->flags &= ~REF_HAVE_OLD; |
92b1551b | 2314 | |
c299468b MÅ |
2315 | /* |
2316 | * Add the referent. This insertion is O(N) in the transaction | |
2317 | * size, but it happens at most once per symref in a | |
2318 | * transaction. Make sure to add new_update->refname, which will | |
2319 | * be valid as long as affected_refnames is in use, and NOT | |
2320 | * referent, which might soon be freed by our caller. | |
2321 | */ | |
2322 | item = string_list_insert(affected_refnames, new_update->refname); | |
2323 | if (item->util) | |
2324 | BUG("%s unexpectedly found in affected_refnames", | |
2325 | new_update->refname); | |
92b1551b MH |
2326 | item->util = new_update; |
2327 | ||
2328 | return 0; | |
2329 | } | |
2330 | ||
6e30b2f6 MH |
2331 | /* |
2332 | * Return the refname under which update was originally requested. | |
2333 | */ | |
2334 | static const char *original_update_refname(struct ref_update *update) | |
2335 | { | |
2336 | while (update->parent_update) | |
2337 | update = update->parent_update; | |
2338 | ||
2339 | return update->refname; | |
2340 | } | |
2341 | ||
e3f51039 MH |
2342 | /* |
2343 | * Check whether the REF_HAVE_OLD and old_oid values stored in update | |
2344 | * are consistent with oid, which is the reference's current value. If | |
2345 | * everything is OK, return 0; otherwise, write an error message to | |
2346 | * err and return -1. | |
2347 | */ | |
2348 | static int check_old_oid(struct ref_update *update, struct object_id *oid, | |
2349 | struct strbuf *err) | |
2350 | { | |
2351 | if (!(update->flags & REF_HAVE_OLD) || | |
4a7e27e9 | 2352 | oideq(oid, &update->old_oid)) |
e3f51039 MH |
2353 | return 0; |
2354 | ||
98491298 | 2355 | if (is_null_oid(&update->old_oid)) |
e3f51039 MH |
2356 | strbuf_addf(err, "cannot lock ref '%s': " |
2357 | "reference already exists", | |
2358 | original_update_refname(update)); | |
2359 | else if (is_null_oid(oid)) | |
2360 | strbuf_addf(err, "cannot lock ref '%s': " | |
2361 | "reference is missing but expected %s", | |
2362 | original_update_refname(update), | |
98491298 | 2363 | oid_to_hex(&update->old_oid)); |
e3f51039 MH |
2364 | else |
2365 | strbuf_addf(err, "cannot lock ref '%s': " | |
2366 | "is at %s but expected %s", | |
2367 | original_update_refname(update), | |
2368 | oid_to_hex(oid), | |
98491298 | 2369 | oid_to_hex(&update->old_oid)); |
e3f51039 MH |
2370 | |
2371 | return -1; | |
2372 | } | |
2373 | ||
92b1551b MH |
2374 | /* |
2375 | * Prepare for carrying out update: | |
2376 | * - Lock the reference referred to by update. | |
2377 | * - Read the reference under lock. | |
78fb4579 | 2378 | * - Check that its old OID value (if specified) is correct, and in |
92b1551b MH |
2379 | * any case record it in update->lock->old_oid for later use when |
2380 | * writing the reflog. | |
91774afc | 2381 | * - If it is a symref update without REF_NO_DEREF, split it up into a |
92b1551b MH |
2382 | * REF_LOG_ONLY update of the symref and add a separate update for |
2383 | * the referent to transaction. | |
2384 | * - If it is an update of head_ref, add a corresponding REF_LOG_ONLY | |
2385 | * update of HEAD. | |
165056b2 | 2386 | */ |
b3bbbc5c MH |
2387 | static int lock_ref_for_update(struct files_ref_store *refs, |
2388 | struct ref_update *update, | |
165056b2 | 2389 | struct ref_transaction *transaction, |
92b1551b | 2390 | const char *head_ref, |
165056b2 MH |
2391 | struct string_list *affected_refnames, |
2392 | struct strbuf *err) | |
2393 | { | |
92b1551b MH |
2394 | struct strbuf referent = STRBUF_INIT; |
2395 | int mustexist = (update->flags & REF_HAVE_OLD) && | |
98491298 | 2396 | !is_null_oid(&update->old_oid); |
851e1fbd | 2397 | int ret = 0; |
92b1551b | 2398 | struct ref_lock *lock; |
165056b2 | 2399 | |
32c597e7 | 2400 | files_assert_main_repository(refs, "lock_ref_for_update"); |
b3bbbc5c | 2401 | |
98491298 | 2402 | if ((update->flags & REF_HAVE_NEW) && is_null_oid(&update->new_oid)) |
165056b2 | 2403 | update->flags |= REF_DELETING; |
92b1551b MH |
2404 | |
2405 | if (head_ref) { | |
2406 | ret = split_head_update(update, transaction, head_ref, | |
2407 | affected_refnames, err); | |
2408 | if (ret) | |
851e1fbd | 2409 | goto out; |
92b1551b MH |
2410 | } |
2411 | ||
f7b0a987 | 2412 | ret = lock_raw_ref(refs, update->refname, mustexist, |
92b1551b | 2413 | affected_refnames, NULL, |
7d618264 | 2414 | &lock, &referent, |
92b1551b | 2415 | &update->type, err); |
92b1551b | 2416 | if (ret) { |
165056b2 MH |
2417 | char *reason; |
2418 | ||
165056b2 MH |
2419 | reason = strbuf_detach(err, NULL); |
2420 | strbuf_addf(err, "cannot lock ref '%s': %s", | |
e3f51039 | 2421 | original_update_refname(update), reason); |
165056b2 | 2422 | free(reason); |
851e1fbd | 2423 | goto out; |
165056b2 | 2424 | } |
92b1551b | 2425 | |
7d618264 | 2426 | update->backend_data = lock; |
92b1551b | 2427 | |
8169d0d0 | 2428 | if (update->type & REF_ISSYMREF) { |
91774afc | 2429 | if (update->flags & REF_NO_DEREF) { |
6e30b2f6 MH |
2430 | /* |
2431 | * We won't be reading the referent as part of | |
2432 | * the transaction, so we have to read it here | |
78fb4579 | 2433 | * to record and possibly check old_oid: |
6e30b2f6 | 2434 | */ |
2f40e954 NTND |
2435 | if (refs_read_ref_full(&refs->base, |
2436 | referent.buf, 0, | |
34c290a6 | 2437 | &lock->old_oid, NULL)) { |
6e30b2f6 MH |
2438 | if (update->flags & REF_HAVE_OLD) { |
2439 | strbuf_addf(err, "cannot lock ref '%s': " | |
e3f51039 MH |
2440 | "error reading reference", |
2441 | original_update_refname(update)); | |
3f5ef95b | 2442 | ret = TRANSACTION_GENERIC_ERROR; |
851e1fbd | 2443 | goto out; |
6e30b2f6 | 2444 | } |
e3f51039 | 2445 | } else if (check_old_oid(update, &lock->old_oid, err)) { |
851e1fbd MÅ |
2446 | ret = TRANSACTION_GENERIC_ERROR; |
2447 | goto out; | |
8169d0d0 | 2448 | } |
6e30b2f6 MH |
2449 | } else { |
2450 | /* | |
2451 | * Create a new update for the reference this | |
2452 | * symref is pointing at. Also, we will record | |
78fb4579 | 2453 | * and verify old_oid for this update as part |
6e30b2f6 MH |
2454 | * of processing the split-off update, so we |
2455 | * don't have to do it here. | |
2456 | */ | |
fcc42ea0 MH |
2457 | ret = split_symref_update(refs, update, |
2458 | referent.buf, transaction, | |
92b1551b MH |
2459 | affected_refnames, err); |
2460 | if (ret) | |
851e1fbd | 2461 | goto out; |
92b1551b | 2462 | } |
6e30b2f6 MH |
2463 | } else { |
2464 | struct ref_update *parent_update; | |
8169d0d0 | 2465 | |
851e1fbd MÅ |
2466 | if (check_old_oid(update, &lock->old_oid, err)) { |
2467 | ret = TRANSACTION_GENERIC_ERROR; | |
2468 | goto out; | |
2469 | } | |
e3f51039 | 2470 | |
6e30b2f6 MH |
2471 | /* |
2472 | * If this update is happening indirectly because of a | |
78fb4579 | 2473 | * symref update, record the old OID in the parent |
6e30b2f6 MH |
2474 | * update: |
2475 | */ | |
2476 | for (parent_update = update->parent_update; | |
2477 | parent_update; | |
2478 | parent_update = parent_update->parent_update) { | |
7d618264 DT |
2479 | struct ref_lock *parent_lock = parent_update->backend_data; |
2480 | oidcpy(&parent_lock->old_oid, &lock->old_oid); | |
6e30b2f6 | 2481 | } |
92b1551b MH |
2482 | } |
2483 | ||
165056b2 MH |
2484 | if ((update->flags & REF_HAVE_NEW) && |
2485 | !(update->flags & REF_DELETING) && | |
2486 | !(update->flags & REF_LOG_ONLY)) { | |
92b1551b | 2487 | if (!(update->type & REF_ISSYMREF) && |
4a7e27e9 | 2488 | oideq(&lock->old_oid, &update->new_oid)) { |
165056b2 MH |
2489 | /* |
2490 | * The reference already has the desired | |
2491 | * value, so we don't need to write it. | |
2492 | */ | |
4417df8c | 2493 | } else if (write_ref_to_lockfile(lock, &update->new_oid, |
165056b2 MH |
2494 | err)) { |
2495 | char *write_err = strbuf_detach(err, NULL); | |
2496 | ||
2497 | /* | |
2498 | * The lock was freed upon failure of | |
2499 | * write_ref_to_lockfile(): | |
2500 | */ | |
7d618264 | 2501 | update->backend_data = NULL; |
165056b2 | 2502 | strbuf_addf(err, |
e3f51039 | 2503 | "cannot update ref '%s': %s", |
165056b2 MH |
2504 | update->refname, write_err); |
2505 | free(write_err); | |
851e1fbd MÅ |
2506 | ret = TRANSACTION_GENERIC_ERROR; |
2507 | goto out; | |
165056b2 MH |
2508 | } else { |
2509 | update->flags |= REF_NEEDS_COMMIT; | |
2510 | } | |
2511 | } | |
2512 | if (!(update->flags & REF_NEEDS_COMMIT)) { | |
2513 | /* | |
2514 | * We didn't call write_ref_to_lockfile(), so | |
2515 | * the lockfile is still open. Close it to | |
2516 | * free up the file descriptor: | |
2517 | */ | |
83a3069a | 2518 | if (close_ref_gently(lock)) { |
165056b2 MH |
2519 | strbuf_addf(err, "couldn't close '%s.lock'", |
2520 | update->refname); | |
851e1fbd MÅ |
2521 | ret = TRANSACTION_GENERIC_ERROR; |
2522 | goto out; | |
165056b2 MH |
2523 | } |
2524 | } | |
851e1fbd MÅ |
2525 | |
2526 | out: | |
2527 | strbuf_release(&referent); | |
2528 | return ret; | |
165056b2 MH |
2529 | } |
2530 | ||
dc39e099 MH |
2531 | struct files_transaction_backend_data { |
2532 | struct ref_transaction *packed_transaction; | |
2533 | int packed_refs_locked; | |
2534 | }; | |
2535 | ||
c0ca9357 MH |
2536 | /* |
2537 | * Unlock any references in `transaction` that are still locked, and | |
2538 | * mark the transaction closed. | |
2539 | */ | |
dc39e099 MH |
2540 | static void files_transaction_cleanup(struct files_ref_store *refs, |
2541 | struct ref_transaction *transaction) | |
c0ca9357 MH |
2542 | { |
2543 | size_t i; | |
dc39e099 MH |
2544 | struct files_transaction_backend_data *backend_data = |
2545 | transaction->backend_data; | |
2546 | struct strbuf err = STRBUF_INIT; | |
c0ca9357 MH |
2547 | |
2548 | for (i = 0; i < transaction->nr; i++) { | |
2549 | struct ref_update *update = transaction->updates[i]; | |
2550 | struct ref_lock *lock = update->backend_data; | |
2551 | ||
2552 | if (lock) { | |
2553 | unlock_ref(lock); | |
2554 | update->backend_data = NULL; | |
2555 | } | |
2556 | } | |
2557 | ||
dc39e099 MH |
2558 | if (backend_data->packed_transaction && |
2559 | ref_transaction_abort(backend_data->packed_transaction, &err)) { | |
2560 | error("error aborting transaction: %s", err.buf); | |
2561 | strbuf_release(&err); | |
2562 | } | |
2563 | ||
2564 | if (backend_data->packed_refs_locked) | |
2565 | packed_refs_unlock(refs->packed_ref_store); | |
2566 | ||
2567 | free(backend_data); | |
2568 | ||
c0ca9357 MH |
2569 | transaction->state = REF_TRANSACTION_CLOSED; |
2570 | } | |
2571 | ||
30173b88 MH |
2572 | static int files_transaction_prepare(struct ref_store *ref_store, |
2573 | struct ref_transaction *transaction, | |
2574 | struct strbuf *err) | |
7bd9bcf3 | 2575 | { |
00eebe35 | 2576 | struct files_ref_store *refs = |
9e7ec634 | 2577 | files_downcast(ref_store, REF_STORE_WRITE, |
30173b88 | 2578 | "ref_transaction_prepare"); |
43a2dfde MH |
2579 | size_t i; |
2580 | int ret = 0; | |
7bd9bcf3 | 2581 | struct string_list affected_refnames = STRING_LIST_INIT_NODUP; |
92b1551b MH |
2582 | char *head_ref = NULL; |
2583 | int head_type; | |
dc39e099 MH |
2584 | struct files_transaction_backend_data *backend_data; |
2585 | struct ref_transaction *packed_transaction = NULL; | |
7bd9bcf3 MH |
2586 | |
2587 | assert(err); | |
2588 | ||
c0ca9357 MH |
2589 | if (!transaction->nr) |
2590 | goto cleanup; | |
7bd9bcf3 | 2591 | |
dc39e099 MH |
2592 | backend_data = xcalloc(1, sizeof(*backend_data)); |
2593 | transaction->backend_data = backend_data; | |
2594 | ||
92b1551b MH |
2595 | /* |
2596 | * Fail if a refname appears more than once in the | |
2597 | * transaction. (If we end up splitting up any updates using | |
2598 | * split_symref_update() or split_head_update(), those | |
2599 | * functions will check that the new updates don't have the | |
62c72d1f | 2600 | * same refname as any existing ones.) Also fail if any of the |
acedcde7 | 2601 | * updates use REF_IS_PRUNING without REF_NO_DEREF. |
92b1551b MH |
2602 | */ |
2603 | for (i = 0; i < transaction->nr; i++) { | |
2604 | struct ref_update *update = transaction->updates[i]; | |
2605 | struct string_list_item *item = | |
2606 | string_list_append(&affected_refnames, update->refname); | |
2607 | ||
acedcde7 | 2608 | if ((update->flags & REF_IS_PRUNING) && |
91774afc | 2609 | !(update->flags & REF_NO_DEREF)) |
acedcde7 | 2610 | BUG("REF_IS_PRUNING set without REF_NO_DEREF"); |
62c72d1f | 2611 | |
92b1551b MH |
2612 | /* |
2613 | * We store a pointer to update in item->util, but at | |
2614 | * the moment we never use the value of this field | |
2615 | * except to check whether it is non-NULL. | |
2616 | */ | |
2617 | item->util = update; | |
2618 | } | |
7bd9bcf3 MH |
2619 | string_list_sort(&affected_refnames); |
2620 | if (ref_update_reject_duplicates(&affected_refnames, err)) { | |
2621 | ret = TRANSACTION_GENERIC_ERROR; | |
2622 | goto cleanup; | |
2623 | } | |
2624 | ||
92b1551b MH |
2625 | /* |
2626 | * Special hack: If a branch is updated directly and HEAD | |
2627 | * points to it (may happen on the remote side of a push | |
2628 | * for example) then logically the HEAD reflog should be | |
2629 | * updated too. | |
2630 | * | |
2631 | * A generic solution would require reverse symref lookups, | |
2632 | * but finding all symrefs pointing to a given branch would be | |
2633 | * rather costly for this rare event (the direct update of a | |
2634 | * branch) to be worth it. So let's cheat and check with HEAD | |
2635 | * only, which should cover 99% of all usage scenarios (even | |
2636 | * 100% of the default ones). | |
2637 | * | |
2638 | * So if HEAD is a symbolic reference, then record the name of | |
2639 | * the reference that it points to. If we see an update of | |
2640 | * head_ref within the transaction, then split_head_update() | |
2641 | * arranges for the reflog of HEAD to be updated, too. | |
2642 | */ | |
2f40e954 NTND |
2643 | head_ref = refs_resolve_refdup(ref_store, "HEAD", |
2644 | RESOLVE_REF_NO_RECURSE, | |
872ccb2c | 2645 | NULL, &head_type); |
92b1551b MH |
2646 | |
2647 | if (head_ref && !(head_type & REF_ISSYMREF)) { | |
6a83d902 | 2648 | FREE_AND_NULL(head_ref); |
92b1551b MH |
2649 | } |
2650 | ||
7bd9bcf3 MH |
2651 | /* |
2652 | * Acquire all locks, verify old values if provided, check | |
2653 | * that new values are valid, and write new values to the | |
2654 | * lockfiles, ready to be activated. Only keep one lockfile | |
2655 | * open at a time to avoid running out of file descriptors. | |
30173b88 MH |
2656 | * Note that lock_ref_for_update() might append more updates |
2657 | * to the transaction. | |
7bd9bcf3 | 2658 | */ |
efe47281 MH |
2659 | for (i = 0; i < transaction->nr; i++) { |
2660 | struct ref_update *update = transaction->updates[i]; | |
7bd9bcf3 | 2661 | |
b3bbbc5c MH |
2662 | ret = lock_ref_for_update(refs, update, transaction, |
2663 | head_ref, &affected_refnames, err); | |
165056b2 | 2664 | if (ret) |
da5267f1 | 2665 | goto cleanup; |
dc39e099 MH |
2666 | |
2667 | if (update->flags & REF_DELETING && | |
2668 | !(update->flags & REF_LOG_ONLY) && | |
acedcde7 | 2669 | !(update->flags & REF_IS_PRUNING)) { |
dc39e099 MH |
2670 | /* |
2671 | * This reference has to be deleted from | |
2672 | * packed-refs if it exists there. | |
2673 | */ | |
2674 | if (!packed_transaction) { | |
2675 | packed_transaction = ref_store_transaction_begin( | |
2676 | refs->packed_ref_store, err); | |
2677 | if (!packed_transaction) { | |
2678 | ret = TRANSACTION_GENERIC_ERROR; | |
2679 | goto cleanup; | |
2680 | } | |
2681 | ||
2682 | backend_data->packed_transaction = | |
2683 | packed_transaction; | |
2684 | } | |
2685 | ||
2686 | ref_transaction_add_update( | |
2687 | packed_transaction, update->refname, | |
91774afc | 2688 | REF_HAVE_NEW | REF_NO_DEREF, |
b0ca4110 | 2689 | &update->new_oid, NULL, |
dc39e099 MH |
2690 | NULL); |
2691 | } | |
2692 | } | |
2693 | ||
2694 | if (packed_transaction) { | |
2695 | if (packed_refs_lock(refs->packed_ref_store, 0, err)) { | |
2696 | ret = TRANSACTION_GENERIC_ERROR; | |
2697 | goto cleanup; | |
2698 | } | |
2699 | backend_data->packed_refs_locked = 1; | |
7c6bd25c MH |
2700 | |
2701 | if (is_packed_transaction_needed(refs->packed_ref_store, | |
2702 | packed_transaction)) { | |
2703 | ret = ref_transaction_prepare(packed_transaction, err); | |
2704 | } else { | |
2705 | /* | |
2706 | * We can skip rewriting the `packed-refs` | |
2707 | * file. But we do need to leave it locked, so | |
2708 | * that somebody else doesn't pack a reference | |
2709 | * that we are trying to delete. | |
2710 | */ | |
2711 | if (ref_transaction_abort(packed_transaction, err)) { | |
2712 | ret = TRANSACTION_GENERIC_ERROR; | |
2713 | goto cleanup; | |
2714 | } | |
2715 | backend_data->packed_transaction = NULL; | |
2716 | } | |
30173b88 MH |
2717 | } |
2718 | ||
2719 | cleanup: | |
2720 | free(head_ref); | |
2721 | string_list_clear(&affected_refnames, 0); | |
2722 | ||
2723 | if (ret) | |
dc39e099 | 2724 | files_transaction_cleanup(refs, transaction); |
30173b88 MH |
2725 | else |
2726 | transaction->state = REF_TRANSACTION_PREPARED; | |
2727 | ||
2728 | return ret; | |
2729 | } | |
2730 | ||
2731 | static int files_transaction_finish(struct ref_store *ref_store, | |
2732 | struct ref_transaction *transaction, | |
2733 | struct strbuf *err) | |
2734 | { | |
2735 | struct files_ref_store *refs = | |
2736 | files_downcast(ref_store, 0, "ref_transaction_finish"); | |
2737 | size_t i; | |
2738 | int ret = 0; | |
30173b88 | 2739 | struct strbuf sb = STRBUF_INIT; |
dc39e099 MH |
2740 | struct files_transaction_backend_data *backend_data; |
2741 | struct ref_transaction *packed_transaction; | |
2742 | ||
30173b88 MH |
2743 | |
2744 | assert(err); | |
2745 | ||
2746 | if (!transaction->nr) { | |
2747 | transaction->state = REF_TRANSACTION_CLOSED; | |
2748 | return 0; | |
7bd9bcf3 | 2749 | } |
7bd9bcf3 | 2750 | |
dc39e099 MH |
2751 | backend_data = transaction->backend_data; |
2752 | packed_transaction = backend_data->packed_transaction; | |
2753 | ||
7bd9bcf3 | 2754 | /* Perform updates first so live commits remain referenced */ |
efe47281 MH |
2755 | for (i = 0; i < transaction->nr; i++) { |
2756 | struct ref_update *update = transaction->updates[i]; | |
7d618264 | 2757 | struct ref_lock *lock = update->backend_data; |
7bd9bcf3 | 2758 | |
d99aa884 DT |
2759 | if (update->flags & REF_NEEDS_COMMIT || |
2760 | update->flags & REF_LOG_ONLY) { | |
802de3da NTND |
2761 | if (files_log_ref_write(refs, |
2762 | lock->ref_name, | |
4417df8c | 2763 | &lock->old_oid, |
2764 | &update->new_oid, | |
81b1b6d4 MH |
2765 | update->msg, update->flags, |
2766 | err)) { | |
92b1551b MH |
2767 | char *old_msg = strbuf_detach(err, NULL); |
2768 | ||
2769 | strbuf_addf(err, "cannot update the ref '%s': %s", | |
2770 | lock->ref_name, old_msg); | |
2771 | free(old_msg); | |
2772 | unlock_ref(lock); | |
7d618264 | 2773 | update->backend_data = NULL; |
7bd9bcf3 MH |
2774 | ret = TRANSACTION_GENERIC_ERROR; |
2775 | goto cleanup; | |
7bd9bcf3 MH |
2776 | } |
2777 | } | |
7bd9bcf3 | 2778 | if (update->flags & REF_NEEDS_COMMIT) { |
00eebe35 | 2779 | clear_loose_ref_cache(refs); |
92b1551b MH |
2780 | if (commit_ref(lock)) { |
2781 | strbuf_addf(err, "couldn't set '%s'", lock->ref_name); | |
2782 | unlock_ref(lock); | |
7d618264 | 2783 | update->backend_data = NULL; |
7bd9bcf3 MH |
2784 | ret = TRANSACTION_GENERIC_ERROR; |
2785 | goto cleanup; | |
7bd9bcf3 MH |
2786 | } |
2787 | } | |
2788 | } | |
dc39e099 | 2789 | |
5e00a6c8 MH |
2790 | /* |
2791 | * Now that updates are safely completed, we can perform | |
2792 | * deletes. First delete the reflogs of any references that | |
2793 | * will be deleted, since (in the unexpected event of an | |
2794 | * error) leaving a reference without a reflog is less bad | |
2795 | * than leaving a reflog without a reference (the latter is a | |
2796 | * mildly invalid repository state): | |
2797 | */ | |
2798 | for (i = 0; i < transaction->nr; i++) { | |
2799 | struct ref_update *update = transaction->updates[i]; | |
2800 | if (update->flags & REF_DELETING && | |
2801 | !(update->flags & REF_LOG_ONLY) && | |
acedcde7 | 2802 | !(update->flags & REF_IS_PRUNING)) { |
5e00a6c8 MH |
2803 | strbuf_reset(&sb); |
2804 | files_reflog_path(refs, &sb, update->refname); | |
2805 | if (!unlink_or_warn(sb.buf)) | |
2806 | try_remove_empty_parents(refs, update->refname, | |
2807 | REMOVE_EMPTY_PARENTS_REFLOG); | |
2808 | } | |
2809 | } | |
2810 | ||
dc39e099 MH |
2811 | /* |
2812 | * Perform deletes now that updates are safely completed. | |
2813 | * | |
2814 | * First delete any packed versions of the references, while | |
2815 | * retaining the packed-refs lock: | |
2816 | */ | |
2817 | if (packed_transaction) { | |
2818 | ret = ref_transaction_commit(packed_transaction, err); | |
2819 | ref_transaction_free(packed_transaction); | |
2820 | packed_transaction = NULL; | |
2821 | backend_data->packed_transaction = NULL; | |
2822 | if (ret) | |
2823 | goto cleanup; | |
2824 | } | |
2825 | ||
2826 | /* Now delete the loose versions of the references: */ | |
efe47281 MH |
2827 | for (i = 0; i < transaction->nr; i++) { |
2828 | struct ref_update *update = transaction->updates[i]; | |
7d618264 | 2829 | struct ref_lock *lock = update->backend_data; |
7bd9bcf3 | 2830 | |
d99aa884 DT |
2831 | if (update->flags & REF_DELETING && |
2832 | !(update->flags & REF_LOG_ONLY)) { | |
ce0af24d MH |
2833 | if (!(update->type & REF_ISPACKED) || |
2834 | update->type & REF_ISSYMREF) { | |
2835 | /* It is a loose reference. */ | |
e9dcc305 | 2836 | strbuf_reset(&sb); |
19e02f4f | 2837 | files_ref_path(refs, &sb, lock->ref_name); |
e9dcc305 | 2838 | if (unlink_or_msg(sb.buf, err)) { |
ce0af24d MH |
2839 | ret = TRANSACTION_GENERIC_ERROR; |
2840 | goto cleanup; | |
2841 | } | |
44639777 | 2842 | update->flags |= REF_DELETED_LOOSE; |
7bd9bcf3 | 2843 | } |
7bd9bcf3 MH |
2844 | } |
2845 | } | |
2846 | ||
00eebe35 | 2847 | clear_loose_ref_cache(refs); |
7bd9bcf3 MH |
2848 | |
2849 | cleanup: | |
dc39e099 | 2850 | files_transaction_cleanup(refs, transaction); |
7bd9bcf3 | 2851 | |
44639777 MH |
2852 | for (i = 0; i < transaction->nr; i++) { |
2853 | struct ref_update *update = transaction->updates[i]; | |
44639777 MH |
2854 | |
2855 | if (update->flags & REF_DELETED_LOOSE) { | |
2856 | /* | |
2857 | * The loose reference was deleted. Delete any | |
2858 | * empty parent directories. (Note that this | |
2859 | * can only work because we have already | |
2860 | * removed the lockfile.) | |
2861 | */ | |
802de3da | 2862 | try_remove_empty_parents(refs, update->refname, |
44639777 MH |
2863 | REMOVE_EMPTY_PARENTS_REF); |
2864 | } | |
2865 | } | |
2866 | ||
30173b88 | 2867 | strbuf_release(&sb); |
7bd9bcf3 MH |
2868 | return ret; |
2869 | } | |
2870 | ||
30173b88 MH |
2871 | static int files_transaction_abort(struct ref_store *ref_store, |
2872 | struct ref_transaction *transaction, | |
2873 | struct strbuf *err) | |
2874 | { | |
dc39e099 MH |
2875 | struct files_ref_store *refs = |
2876 | files_downcast(ref_store, 0, "ref_transaction_abort"); | |
2877 | ||
2878 | files_transaction_cleanup(refs, transaction); | |
30173b88 MH |
2879 | return 0; |
2880 | } | |
2881 | ||
7bd9bcf3 MH |
2882 | static int ref_present(const char *refname, |
2883 | const struct object_id *oid, int flags, void *cb_data) | |
2884 | { | |
2885 | struct string_list *affected_refnames = cb_data; | |
2886 | ||
2887 | return string_list_has_string(affected_refnames, refname); | |
2888 | } | |
2889 | ||
fc681463 DT |
2890 | static int files_initial_transaction_commit(struct ref_store *ref_store, |
2891 | struct ref_transaction *transaction, | |
2892 | struct strbuf *err) | |
7bd9bcf3 | 2893 | { |
d99825ab | 2894 | struct files_ref_store *refs = |
9e7ec634 NTND |
2895 | files_downcast(ref_store, REF_STORE_WRITE, |
2896 | "initial_ref_transaction_commit"); | |
43a2dfde MH |
2897 | size_t i; |
2898 | int ret = 0; | |
7bd9bcf3 | 2899 | struct string_list affected_refnames = STRING_LIST_INIT_NODUP; |
1444bfe0 | 2900 | struct ref_transaction *packed_transaction = NULL; |
7bd9bcf3 MH |
2901 | |
2902 | assert(err); | |
2903 | ||
2904 | if (transaction->state != REF_TRANSACTION_OPEN) | |
033abf97 | 2905 | BUG("commit called for transaction that is not open"); |
7bd9bcf3 MH |
2906 | |
2907 | /* Fail if a refname appears more than once in the transaction: */ | |
efe47281 MH |
2908 | for (i = 0; i < transaction->nr; i++) |
2909 | string_list_append(&affected_refnames, | |
2910 | transaction->updates[i]->refname); | |
7bd9bcf3 MH |
2911 | string_list_sort(&affected_refnames); |
2912 | if (ref_update_reject_duplicates(&affected_refnames, err)) { | |
2913 | ret = TRANSACTION_GENERIC_ERROR; | |
2914 | goto cleanup; | |
2915 | } | |
2916 | ||
2917 | /* | |
2918 | * It's really undefined to call this function in an active | |
2919 | * repository or when there are existing references: we are | |
2920 | * only locking and changing packed-refs, so (1) any | |
2921 | * simultaneous processes might try to change a reference at | |
2922 | * the same time we do, and (2) any existing loose versions of | |
2923 | * the references that we are setting would have precedence | |
2924 | * over our values. But some remote helpers create the remote | |
2925 | * "HEAD" and "master" branches before calling this function, | |
2926 | * so here we really only check that none of the references | |
2927 | * that we are creating already exists. | |
2928 | */ | |
2f40e954 NTND |
2929 | if (refs_for_each_rawref(&refs->base, ref_present, |
2930 | &affected_refnames)) | |
033abf97 | 2931 | BUG("initial ref transaction called with existing refs"); |
7bd9bcf3 | 2932 | |
1444bfe0 MH |
2933 | packed_transaction = ref_store_transaction_begin(refs->packed_ref_store, err); |
2934 | if (!packed_transaction) { | |
2935 | ret = TRANSACTION_GENERIC_ERROR; | |
2936 | goto cleanup; | |
2937 | } | |
2938 | ||
efe47281 MH |
2939 | for (i = 0; i < transaction->nr; i++) { |
2940 | struct ref_update *update = transaction->updates[i]; | |
7bd9bcf3 MH |
2941 | |
2942 | if ((update->flags & REF_HAVE_OLD) && | |
98491298 | 2943 | !is_null_oid(&update->old_oid)) |
033abf97 | 2944 | BUG("initial ref transaction with old_sha1 set"); |
7d2df051 NTND |
2945 | if (refs_verify_refname_available(&refs->base, update->refname, |
2946 | &affected_refnames, NULL, | |
2947 | err)) { | |
7bd9bcf3 MH |
2948 | ret = TRANSACTION_NAME_CONFLICT; |
2949 | goto cleanup; | |
2950 | } | |
1444bfe0 MH |
2951 | |
2952 | /* | |
2953 | * Add a reference creation for this reference to the | |
2954 | * packed-refs transaction: | |
2955 | */ | |
2956 | ref_transaction_add_update(packed_transaction, update->refname, | |
2957 | update->flags & ~REF_HAVE_OLD, | |
89f3bbdd | 2958 | &update->new_oid, &update->old_oid, |
1444bfe0 | 2959 | NULL); |
7bd9bcf3 MH |
2960 | } |
2961 | ||
c8bed835 | 2962 | if (packed_refs_lock(refs->packed_ref_store, 0, err)) { |
7bd9bcf3 MH |
2963 | ret = TRANSACTION_GENERIC_ERROR; |
2964 | goto cleanup; | |
2965 | } | |
2966 | ||
1444bfe0 | 2967 | if (initial_ref_transaction_commit(packed_transaction, err)) { |
7bd9bcf3 | 2968 | ret = TRANSACTION_GENERIC_ERROR; |
7bd9bcf3 MH |
2969 | } |
2970 | ||
81fcb698 | 2971 | packed_refs_unlock(refs->packed_ref_store); |
7bd9bcf3 | 2972 | cleanup: |
1444bfe0 MH |
2973 | if (packed_transaction) |
2974 | ref_transaction_free(packed_transaction); | |
7bd9bcf3 MH |
2975 | transaction->state = REF_TRANSACTION_CLOSED; |
2976 | string_list_clear(&affected_refnames, 0); | |
2977 | return ret; | |
2978 | } | |
2979 | ||
2980 | struct expire_reflog_cb { | |
2981 | unsigned int flags; | |
2982 | reflog_expiry_should_prune_fn *should_prune_fn; | |
2983 | void *policy_cb; | |
2984 | FILE *newlog; | |
9461d272 | 2985 | struct object_id last_kept_oid; |
7bd9bcf3 MH |
2986 | }; |
2987 | ||
9461d272 | 2988 | static int expire_reflog_ent(struct object_id *ooid, struct object_id *noid, |
dddbad72 | 2989 | const char *email, timestamp_t timestamp, int tz, |
7bd9bcf3 MH |
2990 | const char *message, void *cb_data) |
2991 | { | |
2992 | struct expire_reflog_cb *cb = cb_data; | |
2993 | struct expire_reflog_policy_cb *policy_cb = cb->policy_cb; | |
2994 | ||
2995 | if (cb->flags & EXPIRE_REFLOGS_REWRITE) | |
9461d272 | 2996 | ooid = &cb->last_kept_oid; |
7bd9bcf3 | 2997 | |
4322478a | 2998 | if ((*cb->should_prune_fn)(ooid, noid, email, timestamp, tz, |
7bd9bcf3 MH |
2999 | message, policy_cb)) { |
3000 | if (!cb->newlog) | |
3001 | printf("would prune %s", message); | |
3002 | else if (cb->flags & EXPIRE_REFLOGS_VERBOSE) | |
3003 | printf("prune %s", message); | |
3004 | } else { | |
3005 | if (cb->newlog) { | |
cb71f8bd | 3006 | fprintf(cb->newlog, "%s %s %s %"PRItime" %+05d\t%s", |
9461d272 | 3007 | oid_to_hex(ooid), oid_to_hex(noid), |
7bd9bcf3 | 3008 | email, timestamp, tz, message); |
9461d272 | 3009 | oidcpy(&cb->last_kept_oid, noid); |
7bd9bcf3 MH |
3010 | } |
3011 | if (cb->flags & EXPIRE_REFLOGS_VERBOSE) | |
3012 | printf("keep %s", message); | |
3013 | } | |
3014 | return 0; | |
3015 | } | |
3016 | ||
e3688bd6 | 3017 | static int files_reflog_expire(struct ref_store *ref_store, |
0155f710 | 3018 | const char *refname, const struct object_id *oid, |
e3688bd6 DT |
3019 | unsigned int flags, |
3020 | reflog_expiry_prepare_fn prepare_fn, | |
3021 | reflog_expiry_should_prune_fn should_prune_fn, | |
3022 | reflog_expiry_cleanup_fn cleanup_fn, | |
3023 | void *policy_cb_data) | |
7bd9bcf3 | 3024 | { |
7eb27cdf | 3025 | struct files_ref_store *refs = |
9e7ec634 | 3026 | files_downcast(ref_store, REF_STORE_WRITE, "reflog_expire"); |
b2275868 | 3027 | struct lock_file reflog_lock = LOCK_INIT; |
7bd9bcf3 MH |
3028 | struct expire_reflog_cb cb; |
3029 | struct ref_lock *lock; | |
802de3da | 3030 | struct strbuf log_file_sb = STRBUF_INIT; |
7bd9bcf3 MH |
3031 | char *log_file; |
3032 | int status = 0; | |
3033 | int type; | |
3034 | struct strbuf err = STRBUF_INIT; | |
3035 | ||
3036 | memset(&cb, 0, sizeof(cb)); | |
3037 | cb.flags = flags; | |
3038 | cb.policy_cb = policy_cb_data; | |
3039 | cb.should_prune_fn = should_prune_fn; | |
3040 | ||
3041 | /* | |
3042 | * The reflog file is locked by holding the lock on the | |
3043 | * reference itself, plus we might need to update the | |
3044 | * reference if --updateref was specified: | |
3045 | */ | |
4f01e508 | 3046 | lock = lock_ref_oid_basic(refs, refname, oid, |
91774afc | 3047 | NULL, NULL, REF_NO_DEREF, |
4f01e508 | 3048 | &type, &err); |
7bd9bcf3 MH |
3049 | if (!lock) { |
3050 | error("cannot lock ref '%s': %s", refname, err.buf); | |
3051 | strbuf_release(&err); | |
3052 | return -1; | |
3053 | } | |
2f40e954 | 3054 | if (!refs_reflog_exists(ref_store, refname)) { |
7bd9bcf3 MH |
3055 | unlock_ref(lock); |
3056 | return 0; | |
3057 | } | |
3058 | ||
802de3da NTND |
3059 | files_reflog_path(refs, &log_file_sb, refname); |
3060 | log_file = strbuf_detach(&log_file_sb, NULL); | |
7bd9bcf3 MH |
3061 | if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) { |
3062 | /* | |
3063 | * Even though holding $GIT_DIR/logs/$reflog.lock has | |
3064 | * no locking implications, we use the lock_file | |
3065 | * machinery here anyway because it does a lot of the | |
3066 | * work we need, including cleaning up if the program | |
3067 | * exits unexpectedly. | |
3068 | */ | |
3069 | if (hold_lock_file_for_update(&reflog_lock, log_file, 0) < 0) { | |
3070 | struct strbuf err = STRBUF_INIT; | |
3071 | unable_to_lock_message(log_file, errno, &err); | |
3072 | error("%s", err.buf); | |
3073 | strbuf_release(&err); | |
3074 | goto failure; | |
3075 | } | |
3076 | cb.newlog = fdopen_lock_file(&reflog_lock, "w"); | |
3077 | if (!cb.newlog) { | |
3078 | error("cannot fdopen %s (%s)", | |
3079 | get_lock_file_path(&reflog_lock), strerror(errno)); | |
3080 | goto failure; | |
3081 | } | |
3082 | } | |
3083 | ||
0155f710 | 3084 | (*prepare_fn)(refname, oid, cb.policy_cb); |
2f40e954 | 3085 | refs_for_each_reflog_ent(ref_store, refname, expire_reflog_ent, &cb); |
7bd9bcf3 MH |
3086 | (*cleanup_fn)(cb.policy_cb); |
3087 | ||
3088 | if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) { | |
3089 | /* | |
3090 | * It doesn't make sense to adjust a reference pointed | |
3091 | * to by a symbolic ref based on expiring entries in | |
3092 | * the symbolic reference's reflog. Nor can we update | |
3093 | * a reference if there are no remaining reflog | |
3094 | * entries. | |
3095 | */ | |
3096 | int update = (flags & EXPIRE_REFLOGS_UPDATE_REF) && | |
3097 | !(type & REF_ISSYMREF) && | |
9461d272 | 3098 | !is_null_oid(&cb.last_kept_oid); |
7bd9bcf3 | 3099 | |
83a3069a | 3100 | if (close_lock_file_gently(&reflog_lock)) { |
7bd9bcf3 MH |
3101 | status |= error("couldn't write %s: %s", log_file, |
3102 | strerror(errno)); | |
83a3069a | 3103 | rollback_lock_file(&reflog_lock); |
7bd9bcf3 | 3104 | } else if (update && |
ee4d8e45 | 3105 | (write_in_full(get_lock_file_fd(&lock->lk), |
2ae2e2a1 | 3106 | oid_to_hex(&cb.last_kept_oid), the_hash_algo->hexsz) < 0 || |
88780c37 | 3107 | write_str_in_full(get_lock_file_fd(&lock->lk), "\n") < 0 || |
83a3069a | 3108 | close_ref_gently(lock) < 0)) { |
7bd9bcf3 | 3109 | status |= error("couldn't write %s", |
ee4d8e45 | 3110 | get_lock_file_path(&lock->lk)); |
7bd9bcf3 MH |
3111 | rollback_lock_file(&reflog_lock); |
3112 | } else if (commit_lock_file(&reflog_lock)) { | |
e0048d3e | 3113 | status |= error("unable to write reflog '%s' (%s)", |
7bd9bcf3 MH |
3114 | log_file, strerror(errno)); |
3115 | } else if (update && commit_ref(lock)) { | |
3116 | status |= error("couldn't set %s", lock->ref_name); | |
3117 | } | |
3118 | } | |
3119 | free(log_file); | |
3120 | unlock_ref(lock); | |
3121 | return status; | |
3122 | ||
3123 | failure: | |
3124 | rollback_lock_file(&reflog_lock); | |
3125 | free(log_file); | |
3126 | unlock_ref(lock); | |
3127 | return -1; | |
3128 | } | |
3dce444f | 3129 | |
6fb5acfd DT |
3130 | static int files_init_db(struct ref_store *ref_store, struct strbuf *err) |
3131 | { | |
19e02f4f | 3132 | struct files_ref_store *refs = |
9e7ec634 | 3133 | files_downcast(ref_store, REF_STORE_WRITE, "init_db"); |
e9dcc305 NTND |
3134 | struct strbuf sb = STRBUF_INIT; |
3135 | ||
6fb5acfd DT |
3136 | /* |
3137 | * Create .git/refs/{heads,tags} | |
3138 | */ | |
19e02f4f | 3139 | files_ref_path(refs, &sb, "refs/heads"); |
e9dcc305 NTND |
3140 | safe_create_dir(sb.buf, 1); |
3141 | ||
3142 | strbuf_reset(&sb); | |
19e02f4f | 3143 | files_ref_path(refs, &sb, "refs/tags"); |
e9dcc305 NTND |
3144 | safe_create_dir(sb.buf, 1); |
3145 | ||
3146 | strbuf_release(&sb); | |
6fb5acfd DT |
3147 | return 0; |
3148 | } | |
3149 | ||
3dce444f RS |
3150 | struct ref_storage_be refs_be_files = { |
3151 | NULL, | |
00eebe35 | 3152 | "files", |
127b42a1 | 3153 | files_ref_store_create, |
6fb5acfd | 3154 | files_init_db, |
30173b88 MH |
3155 | files_transaction_prepare, |
3156 | files_transaction_finish, | |
3157 | files_transaction_abort, | |
fc681463 | 3158 | files_initial_transaction_commit, |
e1e33b72 | 3159 | |
8231527e | 3160 | files_pack_refs, |
284689ba | 3161 | files_create_symref, |
a27dcf89 | 3162 | files_delete_refs, |
9b6b40d9 | 3163 | files_rename_ref, |
52d59cc6 | 3164 | files_copy_ref, |
8231527e | 3165 | |
1a769003 | 3166 | files_ref_iterator_begin, |
62665823 | 3167 | files_read_raw_ref, |
e3688bd6 DT |
3168 | |
3169 | files_reflog_iterator_begin, | |
3170 | files_for_each_reflog_ent, | |
3171 | files_for_each_reflog_ent_reverse, | |
3172 | files_reflog_exists, | |
3173 | files_create_reflog, | |
3174 | files_delete_reflog, | |
3175 | files_reflog_expire | |
3dce444f | 3176 | }; |