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Commit | Line | Data |
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bc5c5ec0 | 1 | #include "../git-compat-util.h" |
d5fff46f | 2 | #include "../copy.h" |
32a8f510 | 3 | #include "../environment.h" |
f394e093 | 4 | #include "../gettext.h" |
d1cbe1e6 | 5 | #include "../hash.h" |
41771fa4 | 6 | #include "../hex.h" |
7bd9bcf3 MH |
7 | #include "../refs.h" |
8 | #include "refs-internal.h" | |
958f9646 | 9 | #include "ref-cache.h" |
67be7c5a | 10 | #include "packed-backend.h" |
b5fa6081 | 11 | #include "../ident.h" |
3bc581b9 | 12 | #include "../iterator.h" |
2880d16f | 13 | #include "../dir-iterator.h" |
7bd9bcf3 MH |
14 | #include "../lockfile.h" |
15 | #include "../object.h" | |
87bed179 | 16 | #include "../object-file.h" |
c339932b | 17 | #include "../path.h" |
7bd9bcf3 | 18 | #include "../dir.h" |
fb9c2d27 | 19 | #include "../chdir-notify.h" |
e38da487 | 20 | #include "../setup.h" |
d5ebb50d | 21 | #include "../wrapper.h" |
d48be35c | 22 | #include "../write-or-die.h" |
826ae79f | 23 | #include "../revision.h" |
cbc882ea | 24 | #include <wildmatch.h> |
7bd9bcf3 | 25 | |
5ac95fee MH |
26 | /* |
27 | * This backend uses the following flags in `ref_update::flags` for | |
28 | * internal bookkeeping purposes. Their numerical values must not | |
91774afc | 29 | * conflict with REF_NO_DEREF, REF_FORCE_CREATE_REFLOG, REF_HAVE_NEW, |
0464d0a1 | 30 | * or REF_HAVE_OLD, which are also stored in `ref_update::flags`. |
5ac95fee MH |
31 | */ |
32 | ||
33 | /* | |
34 | * Used as a flag in ref_update::flags when a loose ref is being | |
91774afc | 35 | * pruned. This flag must only be used when REF_NO_DEREF is set. |
5ac95fee | 36 | */ |
acedcde7 | 37 | #define REF_IS_PRUNING (1 << 4) |
5ac95fee MH |
38 | |
39 | /* | |
40 | * Flag passed to lock_ref_sha1_basic() telling it to tolerate broken | |
41 | * refs (i.e., because the reference is about to be deleted anyway). | |
42 | */ | |
43 | #define REF_DELETING (1 << 5) | |
44 | ||
45 | /* | |
46 | * Used as a flag in ref_update::flags when the lockfile needs to be | |
47 | * committed. | |
48 | */ | |
49 | #define REF_NEEDS_COMMIT (1 << 6) | |
50 | ||
5ac95fee MH |
51 | /* |
52 | * Used as a flag in ref_update::flags when the ref_update was via an | |
53 | * update to HEAD. | |
54 | */ | |
55 | #define REF_UPDATE_VIA_HEAD (1 << 8) | |
56 | ||
57 | /* | |
5f03e512 WC |
58 | * Used as a flag in ref_update::flags when a reference has been |
59 | * deleted and the ref's parent directories may need cleanup. | |
5ac95fee | 60 | */ |
5f03e512 | 61 | #define REF_DELETED_RMDIR (1 << 9) |
5ac95fee | 62 | |
7bd9bcf3 MH |
63 | struct ref_lock { |
64 | char *ref_name; | |
ee4d8e45 | 65 | struct lock_file lk; |
7bd9bcf3 MH |
66 | struct object_id old_oid; |
67 | }; | |
68 | ||
00eebe35 MH |
69 | struct files_ref_store { |
70 | struct ref_store base; | |
9e7ec634 | 71 | unsigned int store_flags; |
32c597e7 | 72 | |
f57f37e2 | 73 | char *gitcommondir; |
33dfb9f3 | 74 | |
7c22bc8a | 75 | struct ref_cache *loose; |
55c6bc37 | 76 | |
e0cc8ac8 | 77 | struct ref_store *packed_ref_store; |
00eebe35 | 78 | }; |
7bd9bcf3 | 79 | |
65a0a8e5 | 80 | static void clear_loose_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 MH |
81 | { |
82 | if (refs->loose) { | |
7c22bc8a | 83 | free_ref_cache(refs->loose); |
7bd9bcf3 MH |
84 | refs->loose = NULL; |
85 | } | |
86 | } | |
87 | ||
a2d5156c JK |
88 | /* |
89 | * Create a new submodule ref cache and add it to the internal | |
90 | * set of caches. | |
91 | */ | |
34224e14 JT |
92 | static struct ref_store *files_ref_store_create(struct repository *repo, |
93 | const char *gitdir, | |
9e7ec634 | 94 | unsigned int flags) |
7bd9bcf3 | 95 | { |
00eebe35 MH |
96 | struct files_ref_store *refs = xcalloc(1, sizeof(*refs)); |
97 | struct ref_store *ref_store = (struct ref_store *)refs; | |
f57f37e2 | 98 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 | 99 | |
f9f7fd3b | 100 | base_ref_store_init(ref_store, repo, gitdir, &refs_be_files); |
9e7ec634 | 101 | refs->store_flags = flags; |
f57f37e2 NTND |
102 | get_common_dir_noenv(&sb, gitdir); |
103 | refs->gitcommondir = strbuf_detach(&sb, NULL); | |
99f0d97b HWN |
104 | refs->packed_ref_store = |
105 | packed_ref_store_create(repo, refs->gitcommondir, flags); | |
7bd9bcf3 | 106 | |
5085aef4 | 107 | chdir_notify_reparent("files-backend $GIT_DIR", &refs->base.gitdir); |
fb9c2d27 JK |
108 | chdir_notify_reparent("files-backend $GIT_COMMONDIR", |
109 | &refs->gitcommondir); | |
110 | ||
00eebe35 | 111 | return ref_store; |
a2d5156c | 112 | } |
7bd9bcf3 | 113 | |
32c597e7 | 114 | /* |
9e7ec634 NTND |
115 | * Die if refs is not the main ref store. caller is used in any |
116 | * necessary error messages. | |
32c597e7 MH |
117 | */ |
118 | static void files_assert_main_repository(struct files_ref_store *refs, | |
119 | const char *caller) | |
120 | { | |
9e7ec634 NTND |
121 | if (refs->store_flags & REF_STORE_MAIN) |
122 | return; | |
123 | ||
033abf97 | 124 | BUG("operation %s only allowed for main ref store", caller); |
32c597e7 MH |
125 | } |
126 | ||
a2d5156c | 127 | /* |
00eebe35 | 128 | * Downcast ref_store to files_ref_store. Die if ref_store is not a |
9e7ec634 NTND |
129 | * files_ref_store. required_flags is compared with ref_store's |
130 | * store_flags to ensure the ref_store has all required capabilities. | |
131 | * "caller" is used in any necessary error messages. | |
a2d5156c | 132 | */ |
9e7ec634 NTND |
133 | static struct files_ref_store *files_downcast(struct ref_store *ref_store, |
134 | unsigned int required_flags, | |
135 | const char *caller) | |
a2d5156c | 136 | { |
32c597e7 MH |
137 | struct files_ref_store *refs; |
138 | ||
00eebe35 | 139 | if (ref_store->be != &refs_be_files) |
033abf97 | 140 | BUG("ref_store is type \"%s\" not \"files\" in %s", |
00eebe35 | 141 | ref_store->be->name, caller); |
2eed2780 | 142 | |
32c597e7 MH |
143 | refs = (struct files_ref_store *)ref_store; |
144 | ||
9e7ec634 | 145 | if ((refs->store_flags & required_flags) != required_flags) |
033abf97 | 146 | BUG("operation %s requires abilities 0x%x, but only have 0x%x", |
9e7ec634 | 147 | caller, required_flags, refs->store_flags); |
2eed2780 | 148 | |
32c597e7 | 149 | return refs; |
7bd9bcf3 MH |
150 | } |
151 | ||
802de3da NTND |
152 | static void files_reflog_path(struct files_ref_store *refs, |
153 | struct strbuf *sb, | |
154 | const char *refname) | |
155 | { | |
71e54734 HWN |
156 | const char *bare_refname; |
157 | const char *wtname; | |
158 | int wtname_len; | |
159 | enum ref_worktree_type wt_type = parse_worktree_ref( | |
160 | refname, &wtname, &wtname_len, &bare_refname); | |
161 | ||
162 | switch (wt_type) { | |
163 | case REF_WORKTREE_CURRENT: | |
5085aef4 | 164 | strbuf_addf(sb, "%s/logs/%s", refs->base.gitdir, refname); |
f57f37e2 | 165 | break; |
71e54734 HWN |
166 | case REF_WORKTREE_SHARED: |
167 | case REF_WORKTREE_MAIN: | |
168 | strbuf_addf(sb, "%s/logs/%s", refs->gitcommondir, bare_refname); | |
46c0eb58 | 169 | break; |
71e54734 HWN |
170 | case REF_WORKTREE_OTHER: |
171 | strbuf_addf(sb, "%s/worktrees/%.*s/logs/%s", refs->gitcommondir, | |
172 | wtname_len, wtname, bare_refname); | |
f57f37e2 NTND |
173 | break; |
174 | default: | |
71e54734 | 175 | BUG("unknown ref type %d of ref %s", wt_type, refname); |
f57f37e2 | 176 | } |
802de3da NTND |
177 | } |
178 | ||
19e02f4f NTND |
179 | static void files_ref_path(struct files_ref_store *refs, |
180 | struct strbuf *sb, | |
181 | const char *refname) | |
182 | { | |
71e54734 HWN |
183 | const char *bare_refname; |
184 | const char *wtname; | |
185 | int wtname_len; | |
186 | enum ref_worktree_type wt_type = parse_worktree_ref( | |
187 | refname, &wtname, &wtname_len, &bare_refname); | |
188 | switch (wt_type) { | |
189 | case REF_WORKTREE_CURRENT: | |
5085aef4 | 190 | strbuf_addf(sb, "%s/%s", refs->base.gitdir, refname); |
f57f37e2 | 191 | break; |
71e54734 HWN |
192 | case REF_WORKTREE_OTHER: |
193 | strbuf_addf(sb, "%s/worktrees/%.*s/%s", refs->gitcommondir, | |
194 | wtname_len, wtname, bare_refname); | |
195 | break; | |
196 | case REF_WORKTREE_SHARED: | |
197 | case REF_WORKTREE_MAIN: | |
198 | strbuf_addf(sb, "%s/%s", refs->gitcommondir, bare_refname); | |
f57f37e2 NTND |
199 | break; |
200 | default: | |
71e54734 | 201 | BUG("unknown ref type %d of ref %s", wt_type, refname); |
f57f37e2 | 202 | } |
19e02f4f NTND |
203 | } |
204 | ||
09e65645 | 205 | /* |
b9317d55 | 206 | * Manually add refs/bisect, refs/rewritten and refs/worktree, which, being |
09e65645 NTND |
207 | * per-worktree, might not appear in the directory listing for |
208 | * refs/ in the main repo. | |
209 | */ | |
210 | static void add_per_worktree_entries_to_dir(struct ref_dir *dir, const char *dirname) | |
211 | { | |
b9317d55 | 212 | const char *prefixes[] = { "refs/bisect/", "refs/worktree/", "refs/rewritten/" }; |
90d31ff5 | 213 | int ip; |
09e65645 NTND |
214 | |
215 | if (strcmp(dirname, "refs/")) | |
216 | return; | |
217 | ||
90d31ff5 NTND |
218 | for (ip = 0; ip < ARRAY_SIZE(prefixes); ip++) { |
219 | const char *prefix = prefixes[ip]; | |
220 | int prefix_len = strlen(prefix); | |
221 | struct ref_entry *child_entry; | |
222 | int pos; | |
09e65645 | 223 | |
90d31ff5 NTND |
224 | pos = search_ref_dir(dir, prefix, prefix_len); |
225 | if (pos >= 0) | |
226 | continue; | |
750036c8 | 227 | child_entry = create_dir_entry(dir->cache, prefix, prefix_len); |
09e65645 NTND |
228 | add_entry_to_dir(dir, child_entry); |
229 | } | |
230 | } | |
231 | ||
f768296c KN |
232 | static void loose_fill_ref_dir_regular_file(struct files_ref_store *refs, |
233 | const char *refname, | |
234 | struct ref_dir *dir) | |
235 | { | |
236 | struct object_id oid; | |
237 | int flag; | |
238 | ||
239 | if (!refs_resolve_ref_unsafe(&refs->base, refname, RESOLVE_REF_READING, | |
240 | &oid, &flag)) { | |
241 | oidclr(&oid); | |
242 | flag |= REF_ISBROKEN; | |
243 | } else if (is_null_oid(&oid)) { | |
244 | /* | |
245 | * It is so astronomically unlikely | |
246 | * that null_oid is the OID of an | |
247 | * actual object that we consider its | |
248 | * appearance in a loose reference | |
249 | * file to be repo corruption | |
250 | * (probably due to a software bug). | |
251 | */ | |
252 | flag |= REF_ISBROKEN; | |
253 | } | |
254 | ||
255 | if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) { | |
256 | if (!refname_is_safe(refname)) | |
257 | die("loose refname is dangerous: %s", refname); | |
258 | oidclr(&oid); | |
259 | flag |= REF_BAD_NAME | REF_ISBROKEN; | |
260 | } | |
261 | add_entry_to_dir(dir, create_ref_entry(refname, &oid, flag)); | |
262 | } | |
263 | ||
7bd9bcf3 MH |
264 | /* |
265 | * Read the loose references from the namespace dirname into dir | |
266 | * (without recursing). dirname must end with '/'. dir must be the | |
267 | * directory entry corresponding to dirname. | |
268 | */ | |
df308759 MH |
269 | static void loose_fill_ref_dir(struct ref_store *ref_store, |
270 | struct ref_dir *dir, const char *dirname) | |
7bd9bcf3 | 271 | { |
df308759 MH |
272 | struct files_ref_store *refs = |
273 | files_downcast(ref_store, REF_STORE_READ, "fill_ref_dir"); | |
7bd9bcf3 MH |
274 | DIR *d; |
275 | struct dirent *de; | |
276 | int dirnamelen = strlen(dirname); | |
277 | struct strbuf refname; | |
278 | struct strbuf path = STRBUF_INIT; | |
7bd9bcf3 | 279 | |
19e02f4f | 280 | files_ref_path(refs, &path, dirname); |
7bd9bcf3 MH |
281 | |
282 | d = opendir(path.buf); | |
283 | if (!d) { | |
284 | strbuf_release(&path); | |
285 | return; | |
286 | } | |
287 | ||
288 | strbuf_init(&refname, dirnamelen + 257); | |
289 | strbuf_add(&refname, dirname, dirnamelen); | |
290 | ||
291 | while ((de = readdir(d)) != NULL) { | |
2cdb7961 | 292 | unsigned char dtype; |
7bd9bcf3 MH |
293 | |
294 | if (de->d_name[0] == '.') | |
295 | continue; | |
296 | if (ends_with(de->d_name, ".lock")) | |
297 | continue; | |
298 | strbuf_addstr(&refname, de->d_name); | |
2cdb7961 VD |
299 | |
300 | dtype = get_dtype(de, &path, 1); | |
301 | if (dtype == DT_DIR) { | |
7bd9bcf3 MH |
302 | strbuf_addch(&refname, '/'); |
303 | add_entry_to_dir(dir, | |
e00d1a4f | 304 | create_dir_entry(dir->cache, refname.buf, |
750036c8 | 305 | refname.len)); |
2cdb7961 | 306 | } else if (dtype == DT_REG) { |
f768296c | 307 | loose_fill_ref_dir_regular_file(refs, refname.buf, dir); |
7bd9bcf3 MH |
308 | } |
309 | strbuf_setlen(&refname, dirnamelen); | |
7bd9bcf3 MH |
310 | } |
311 | strbuf_release(&refname); | |
312 | strbuf_release(&path); | |
313 | closedir(d); | |
e3bf2989 | 314 | |
09e65645 | 315 | add_per_worktree_entries_to_dir(dir, dirname); |
7bd9bcf3 MH |
316 | } |
317 | ||
d0f00c1a KN |
318 | /* |
319 | * Add pseudorefs to the ref dir by parsing the directory for any files | |
320 | * which follow the pseudoref syntax. | |
321 | */ | |
322 | static void add_pseudoref_and_head_entries(struct ref_store *ref_store, | |
323 | struct ref_dir *dir, | |
324 | const char *dirname) | |
325 | { | |
326 | struct files_ref_store *refs = | |
327 | files_downcast(ref_store, REF_STORE_READ, "fill_ref_dir"); | |
328 | struct strbuf path = STRBUF_INIT, refname = STRBUF_INIT; | |
329 | struct dirent *de; | |
330 | size_t dirnamelen; | |
331 | DIR *d; | |
332 | ||
333 | files_ref_path(refs, &path, dirname); | |
334 | ||
335 | d = opendir(path.buf); | |
336 | if (!d) { | |
337 | strbuf_release(&path); | |
338 | return; | |
339 | } | |
340 | ||
341 | strbuf_addstr(&refname, dirname); | |
342 | dirnamelen = refname.len; | |
343 | ||
344 | while ((de = readdir(d)) != NULL) { | |
345 | unsigned char dtype; | |
346 | ||
347 | if (de->d_name[0] == '.') | |
348 | continue; | |
349 | if (ends_with(de->d_name, ".lock")) | |
350 | continue; | |
351 | strbuf_addstr(&refname, de->d_name); | |
352 | ||
353 | dtype = get_dtype(de, &path, 1); | |
354 | if (dtype == DT_REG && (is_pseudoref(ref_store, de->d_name) || | |
355 | is_headref(ref_store, de->d_name))) | |
356 | loose_fill_ref_dir_regular_file(refs, refname.buf, dir); | |
357 | ||
358 | strbuf_setlen(&refname, dirnamelen); | |
359 | } | |
360 | strbuf_release(&refname); | |
361 | strbuf_release(&path); | |
362 | closedir(d); | |
363 | } | |
364 | ||
365 | static struct ref_cache *get_loose_ref_cache(struct files_ref_store *refs, | |
366 | unsigned int flags) | |
7bd9bcf3 MH |
367 | { |
368 | if (!refs->loose) { | |
d0f00c1a KN |
369 | struct ref_dir *dir; |
370 | ||
7bd9bcf3 MH |
371 | /* |
372 | * Mark the top-level directory complete because we | |
373 | * are about to read the only subdirectory that can | |
374 | * hold references: | |
375 | */ | |
df308759 | 376 | refs->loose = create_ref_cache(&refs->base, loose_fill_ref_dir); |
7c22bc8a MH |
377 | |
378 | /* We're going to fill the top level ourselves: */ | |
379 | refs->loose->root->flag &= ~REF_INCOMPLETE; | |
380 | ||
d0f00c1a KN |
381 | dir = get_ref_dir(refs->loose->root); |
382 | ||
383 | if (flags & DO_FOR_EACH_INCLUDE_ROOT_REFS) | |
384 | add_pseudoref_and_head_entries(dir->cache->ref_store, dir, | |
385 | refs->loose->root->name); | |
386 | ||
7bd9bcf3 | 387 | /* |
7c22bc8a MH |
388 | * Add an incomplete entry for "refs/" (to be filled |
389 | * lazily): | |
7bd9bcf3 | 390 | */ |
d0f00c1a | 391 | add_entry_to_dir(dir, create_dir_entry(refs->loose, "refs/", 5)); |
7bd9bcf3 | 392 | } |
a714b19c | 393 | return refs->loose; |
7bd9bcf3 MH |
394 | } |
395 | ||
0a7b3870 PS |
396 | static int read_ref_internal(struct ref_store *ref_store, const char *refname, |
397 | struct object_id *oid, struct strbuf *referent, | |
398 | unsigned int *type, int *failure_errno, int skip_packed_refs) | |
7bd9bcf3 | 399 | { |
4308651c | 400 | struct files_ref_store *refs = |
9e7ec634 | 401 | files_downcast(ref_store, REF_STORE_READ, "read_raw_ref"); |
42a38cf7 MH |
402 | struct strbuf sb_contents = STRBUF_INIT; |
403 | struct strbuf sb_path = STRBUF_INIT; | |
7048653a DT |
404 | const char *path; |
405 | const char *buf; | |
406 | struct stat st; | |
407 | int fd; | |
42a38cf7 | 408 | int ret = -1; |
e8c42cb9 | 409 | int remaining_retries = 3; |
df3458e9 | 410 | int myerr = 0; |
7bd9bcf3 | 411 | |
fa96ea1b | 412 | *type = 0; |
42a38cf7 | 413 | strbuf_reset(&sb_path); |
34c7ad8f | 414 | |
19e02f4f | 415 | files_ref_path(refs, &sb_path, refname); |
34c7ad8f | 416 | |
42a38cf7 | 417 | path = sb_path.buf; |
7bd9bcf3 | 418 | |
7048653a DT |
419 | stat_ref: |
420 | /* | |
421 | * We might have to loop back here to avoid a race | |
422 | * condition: first we lstat() the file, then we try | |
423 | * to read it as a link or as a file. But if somebody | |
424 | * changes the type of the file (file <-> directory | |
425 | * <-> symlink) between the lstat() and reading, then | |
426 | * we don't want to report that as an error but rather | |
427 | * try again starting with the lstat(). | |
e8c42cb9 JK |
428 | * |
429 | * We'll keep a count of the retries, though, just to avoid | |
430 | * any confusing situation sending us into an infinite loop. | |
7048653a | 431 | */ |
7bd9bcf3 | 432 | |
e8c42cb9 JK |
433 | if (remaining_retries-- <= 0) |
434 | goto out; | |
435 | ||
7048653a | 436 | if (lstat(path, &st) < 0) { |
8b72fea7 | 437 | int ignore_errno; |
df3458e9 | 438 | myerr = errno; |
0a7b3870 | 439 | if (myerr != ENOENT || skip_packed_refs) |
42a38cf7 | 440 | goto out; |
8b72fea7 HWN |
441 | if (refs_read_raw_ref(refs->packed_ref_store, refname, oid, |
442 | referent, type, &ignore_errno)) { | |
df3458e9 | 443 | myerr = ENOENT; |
42a38cf7 | 444 | goto out; |
7bd9bcf3 | 445 | } |
42a38cf7 MH |
446 | ret = 0; |
447 | goto out; | |
7bd9bcf3 | 448 | } |
7bd9bcf3 | 449 | |
7048653a DT |
450 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
451 | if (S_ISLNK(st.st_mode)) { | |
42a38cf7 | 452 | strbuf_reset(&sb_contents); |
765b496d | 453 | if (strbuf_readlink(&sb_contents, path, st.st_size) < 0) { |
df3458e9 | 454 | myerr = errno; |
df3458e9 | 455 | if (myerr == ENOENT || myerr == EINVAL) |
7bd9bcf3 MH |
456 | /* inconsistent with lstat; retry */ |
457 | goto stat_ref; | |
458 | else | |
42a38cf7 | 459 | goto out; |
7bd9bcf3 | 460 | } |
42a38cf7 MH |
461 | if (starts_with(sb_contents.buf, "refs/") && |
462 | !check_refname_format(sb_contents.buf, 0)) { | |
92b38093 | 463 | strbuf_swap(&sb_contents, referent); |
3a0b6b9a | 464 | *type |= REF_ISSYMREF; |
42a38cf7 MH |
465 | ret = 0; |
466 | goto out; | |
7bd9bcf3 | 467 | } |
3f7bd767 JK |
468 | /* |
469 | * It doesn't look like a refname; fall through to just | |
470 | * treating it like a non-symlink, and reading whatever it | |
471 | * points to. | |
472 | */ | |
7048653a | 473 | } |
7bd9bcf3 | 474 | |
7048653a DT |
475 | /* Is it a directory? */ |
476 | if (S_ISDIR(st.st_mode)) { | |
8b72fea7 | 477 | int ignore_errno; |
e167a567 MH |
478 | /* |
479 | * Even though there is a directory where the loose | |
480 | * ref is supposed to be, there could still be a | |
481 | * packed ref: | |
482 | */ | |
0a7b3870 PS |
483 | if (skip_packed_refs || |
484 | refs_read_raw_ref(refs->packed_ref_store, refname, oid, | |
8b72fea7 | 485 | referent, type, &ignore_errno)) { |
df3458e9 | 486 | myerr = EISDIR; |
e167a567 MH |
487 | goto out; |
488 | } | |
489 | ret = 0; | |
42a38cf7 | 490 | goto out; |
7048653a DT |
491 | } |
492 | ||
493 | /* | |
494 | * Anything else, just open it and try to use it as | |
495 | * a ref | |
496 | */ | |
497 | fd = open(path, O_RDONLY); | |
498 | if (fd < 0) { | |
df3458e9 HWN |
499 | myerr = errno; |
500 | if (myerr == ENOENT && !S_ISLNK(st.st_mode)) | |
7048653a DT |
501 | /* inconsistent with lstat; retry */ |
502 | goto stat_ref; | |
503 | else | |
42a38cf7 | 504 | goto out; |
7048653a | 505 | } |
42a38cf7 MH |
506 | strbuf_reset(&sb_contents); |
507 | if (strbuf_read(&sb_contents, fd, 256) < 0) { | |
df3458e9 | 508 | myerr = errno; |
7048653a | 509 | close(fd); |
42a38cf7 | 510 | goto out; |
7048653a DT |
511 | } |
512 | close(fd); | |
42a38cf7 MH |
513 | strbuf_rtrim(&sb_contents); |
514 | buf = sb_contents.buf; | |
e39620f0 | 515 | |
df3458e9 | 516 | ret = parse_loose_ref_contents(buf, oid, referent, type, &myerr); |
e39620f0 HWN |
517 | |
518 | out: | |
df3458e9 HWN |
519 | if (ret && !myerr) |
520 | BUG("returning non-zero %d, should have set myerr!", ret); | |
521 | *failure_errno = myerr; | |
522 | ||
e39620f0 HWN |
523 | strbuf_release(&sb_path); |
524 | strbuf_release(&sb_contents); | |
cac15b3f | 525 | errno = 0; |
e39620f0 HWN |
526 | return ret; |
527 | } | |
528 | ||
0a7b3870 PS |
529 | static int files_read_raw_ref(struct ref_store *ref_store, const char *refname, |
530 | struct object_id *oid, struct strbuf *referent, | |
531 | unsigned int *type, int *failure_errno) | |
532 | { | |
533 | return read_ref_internal(ref_store, refname, oid, referent, type, failure_errno, 0); | |
534 | } | |
535 | ||
536 | static int files_read_symbolic_ref(struct ref_store *ref_store, const char *refname, | |
537 | struct strbuf *referent) | |
538 | { | |
539 | struct object_id oid; | |
540 | int failure_errno, ret; | |
541 | unsigned int type; | |
542 | ||
543 | ret = read_ref_internal(ref_store, refname, &oid, referent, &type, &failure_errno, 1); | |
544 | if (ret) | |
545 | return ret; | |
546 | ||
547 | return !(type & REF_ISSYMREF); | |
548 | } | |
549 | ||
e39620f0 | 550 | int parse_loose_ref_contents(const char *buf, struct object_id *oid, |
df3458e9 HWN |
551 | struct strbuf *referent, unsigned int *type, |
552 | int *failure_errno) | |
e39620f0 HWN |
553 | { |
554 | const char *p; | |
145136a9 | 555 | if (skip_prefix(buf, "ref:", &buf)) { |
7bd9bcf3 MH |
556 | while (isspace(*buf)) |
557 | buf++; | |
7048653a | 558 | |
92b38093 MH |
559 | strbuf_reset(referent); |
560 | strbuf_addstr(referent, buf); | |
3a0b6b9a | 561 | *type |= REF_ISSYMREF; |
e39620f0 | 562 | return 0; |
7bd9bcf3 | 563 | } |
7bd9bcf3 | 564 | |
7048653a | 565 | /* |
e39620f0 | 566 | * FETCH_HEAD has additional data after the sha. |
7048653a | 567 | */ |
99afe91a | 568 | if (parse_oid_hex(buf, oid, &p) || |
569 | (*p != '\0' && !isspace(*p))) { | |
3a0b6b9a | 570 | *type |= REF_ISBROKEN; |
df3458e9 | 571 | *failure_errno = EINVAL; |
e39620f0 | 572 | return -1; |
7048653a | 573 | } |
e39620f0 | 574 | return 0; |
7bd9bcf3 MH |
575 | } |
576 | ||
8415d247 MH |
577 | static void unlock_ref(struct ref_lock *lock) |
578 | { | |
ee4d8e45 | 579 | rollback_lock_file(&lock->lk); |
8415d247 | 580 | free(lock->ref_name); |
8415d247 MH |
581 | free(lock); |
582 | } | |
583 | ||
92b1551b MH |
584 | /* |
585 | * Lock refname, without following symrefs, and set *lock_p to point | |
586 | * at a newly-allocated lock object. Fill in lock->old_oid, referent, | |
587 | * and type similarly to read_raw_ref(). | |
588 | * | |
589 | * The caller must verify that refname is a "safe" reference name (in | |
590 | * the sense of refname_is_safe()) before calling this function. | |
591 | * | |
592 | * If the reference doesn't already exist, verify that refname doesn't | |
593 | * have a D/F conflict with any existing references. extras and skip | |
524a9fdb | 594 | * are passed to refs_verify_refname_available() for this check. |
92b1551b MH |
595 | * |
596 | * If mustexist is not set and the reference is not found or is | |
78fb4579 | 597 | * broken, lock the reference anyway but clear old_oid. |
92b1551b MH |
598 | * |
599 | * Return 0 on success. On failure, write an error message to err and | |
600 | * return TRANSACTION_NAME_CONFLICT or TRANSACTION_GENERIC_ERROR. | |
601 | * | |
602 | * Implementation note: This function is basically | |
603 | * | |
604 | * lock reference | |
605 | * read_raw_ref() | |
606 | * | |
607 | * but it includes a lot more code to | |
608 | * - Deal with possible races with other processes | |
524a9fdb | 609 | * - Avoid calling refs_verify_refname_available() when it can be |
92b1551b MH |
610 | * avoided, namely if we were successfully able to read the ref |
611 | * - Generate informative error messages in the case of failure | |
612 | */ | |
f7b0a987 MH |
613 | static int lock_raw_ref(struct files_ref_store *refs, |
614 | const char *refname, int mustexist, | |
92b1551b | 615 | const struct string_list *extras, |
92b1551b MH |
616 | struct ref_lock **lock_p, |
617 | struct strbuf *referent, | |
618 | unsigned int *type, | |
619 | struct strbuf *err) | |
620 | { | |
621 | struct ref_lock *lock; | |
622 | struct strbuf ref_file = STRBUF_INIT; | |
623 | int attempts_remaining = 3; | |
624 | int ret = TRANSACTION_GENERIC_ERROR; | |
5b12e16b | 625 | int failure_errno; |
92b1551b MH |
626 | |
627 | assert(err); | |
32c597e7 | 628 | files_assert_main_repository(refs, "lock_raw_ref"); |
f7b0a987 | 629 | |
92b1551b MH |
630 | *type = 0; |
631 | ||
632 | /* First lock the file so it can't change out from under us. */ | |
633 | ||
ca56dadb | 634 | *lock_p = CALLOC_ARRAY(lock, 1); |
92b1551b MH |
635 | |
636 | lock->ref_name = xstrdup(refname); | |
19e02f4f | 637 | files_ref_path(refs, &ref_file, refname); |
92b1551b MH |
638 | |
639 | retry: | |
640 | switch (safe_create_leading_directories(ref_file.buf)) { | |
641 | case SCLD_OK: | |
642 | break; /* success */ | |
643 | case SCLD_EXISTS: | |
644 | /* | |
645 | * Suppose refname is "refs/foo/bar". We just failed | |
646 | * to create the containing directory, "refs/foo", | |
647 | * because there was a non-directory in the way. This | |
648 | * indicates a D/F conflict, probably because of | |
649 | * another reference such as "refs/foo". There is no | |
650 | * reason to expect this error to be transitory. | |
651 | */ | |
7d2df051 | 652 | if (refs_verify_refname_available(&refs->base, refname, |
640d9d55 | 653 | extras, NULL, err)) { |
92b1551b MH |
654 | if (mustexist) { |
655 | /* | |
656 | * To the user the relevant error is | |
657 | * that the "mustexist" reference is | |
658 | * missing: | |
659 | */ | |
660 | strbuf_reset(err); | |
661 | strbuf_addf(err, "unable to resolve reference '%s'", | |
662 | refname); | |
663 | } else { | |
664 | /* | |
665 | * The error message set by | |
524a9fdb MH |
666 | * refs_verify_refname_available() is |
667 | * OK. | |
92b1551b MH |
668 | */ |
669 | ret = TRANSACTION_NAME_CONFLICT; | |
670 | } | |
671 | } else { | |
672 | /* | |
673 | * The file that is in the way isn't a loose | |
674 | * reference. Report it as a low-level | |
675 | * failure. | |
676 | */ | |
677 | strbuf_addf(err, "unable to create lock file %s.lock; " | |
678 | "non-directory in the way", | |
679 | ref_file.buf); | |
680 | } | |
681 | goto error_return; | |
682 | case SCLD_VANISHED: | |
683 | /* Maybe another process was tidying up. Try again. */ | |
684 | if (--attempts_remaining > 0) | |
685 | goto retry; | |
686 | /* fall through */ | |
687 | default: | |
688 | strbuf_addf(err, "unable to create directory for %s", | |
689 | ref_file.buf); | |
690 | goto error_return; | |
691 | } | |
692 | ||
4ff0f01c | 693 | if (hold_lock_file_for_update_timeout( |
ee4d8e45 | 694 | &lock->lk, ref_file.buf, LOCK_NO_DEREF, |
4ff0f01c | 695 | get_files_ref_lock_timeout_ms()) < 0) { |
5b12e16b HWN |
696 | int myerr = errno; |
697 | errno = 0; | |
698 | if (myerr == ENOENT && --attempts_remaining > 0) { | |
92b1551b MH |
699 | /* |
700 | * Maybe somebody just deleted one of the | |
701 | * directories leading to ref_file. Try | |
702 | * again: | |
703 | */ | |
704 | goto retry; | |
705 | } else { | |
5b12e16b | 706 | unable_to_lock_message(ref_file.buf, myerr, err); |
92b1551b MH |
707 | goto error_return; |
708 | } | |
709 | } | |
710 | ||
711 | /* | |
712 | * Now we hold the lock and can read the reference without | |
713 | * fear that its value will change. | |
714 | */ | |
715 | ||
5b12e16b HWN |
716 | if (files_read_raw_ref(&refs->base, refname, &lock->old_oid, referent, |
717 | type, &failure_errno)) { | |
718 | if (failure_errno == ENOENT) { | |
92b1551b MH |
719 | if (mustexist) { |
720 | /* Garden variety missing reference. */ | |
721 | strbuf_addf(err, "unable to resolve reference '%s'", | |
722 | refname); | |
723 | goto error_return; | |
724 | } else { | |
725 | /* | |
726 | * Reference is missing, but that's OK. We | |
727 | * know that there is not a conflict with | |
728 | * another loose reference because | |
729 | * (supposing that we are trying to lock | |
730 | * reference "refs/foo/bar"): | |
731 | * | |
732 | * - We were successfully able to create | |
733 | * the lockfile refs/foo/bar.lock, so we | |
734 | * know there cannot be a loose reference | |
735 | * named "refs/foo". | |
736 | * | |
737 | * - We got ENOENT and not EISDIR, so we | |
738 | * know that there cannot be a loose | |
739 | * reference named "refs/foo/bar/baz". | |
740 | */ | |
741 | } | |
5b12e16b | 742 | } else if (failure_errno == EISDIR) { |
92b1551b MH |
743 | /* |
744 | * There is a directory in the way. It might have | |
745 | * contained references that have been deleted. If | |
746 | * we don't require that the reference already | |
747 | * exists, try to remove the directory so that it | |
748 | * doesn't cause trouble when we want to rename the | |
749 | * lockfile into place later. | |
750 | */ | |
751 | if (mustexist) { | |
752 | /* Garden variety missing reference. */ | |
753 | strbuf_addf(err, "unable to resolve reference '%s'", | |
754 | refname); | |
755 | goto error_return; | |
756 | } else if (remove_dir_recursively(&ref_file, | |
757 | REMOVE_DIR_EMPTY_ONLY)) { | |
b05855b5 MH |
758 | if (refs_verify_refname_available( |
759 | &refs->base, refname, | |
640d9d55 | 760 | extras, NULL, err)) { |
92b1551b MH |
761 | /* |
762 | * The error message set by | |
763 | * verify_refname_available() is OK. | |
764 | */ | |
765 | ret = TRANSACTION_NAME_CONFLICT; | |
766 | goto error_return; | |
767 | } else { | |
768 | /* | |
769 | * We can't delete the directory, | |
770 | * but we also don't know of any | |
771 | * references that it should | |
772 | * contain. | |
773 | */ | |
774 | strbuf_addf(err, "there is a non-empty directory '%s' " | |
775 | "blocking reference '%s'", | |
776 | ref_file.buf, refname); | |
777 | goto error_return; | |
778 | } | |
779 | } | |
5b12e16b | 780 | } else if (failure_errno == EINVAL && (*type & REF_ISBROKEN)) { |
92b1551b MH |
781 | strbuf_addf(err, "unable to resolve reference '%s': " |
782 | "reference broken", refname); | |
783 | goto error_return; | |
784 | } else { | |
785 | strbuf_addf(err, "unable to resolve reference '%s': %s", | |
5b12e16b | 786 | refname, strerror(failure_errno)); |
92b1551b MH |
787 | goto error_return; |
788 | } | |
789 | ||
790 | /* | |
791 | * If the ref did not exist and we are creating it, | |
8ec617c8 MH |
792 | * make sure there is no existing packed ref that |
793 | * conflicts with refname: | |
92b1551b | 794 | */ |
524a9fdb | 795 | if (refs_verify_refname_available( |
8ec617c8 | 796 | refs->packed_ref_store, refname, |
640d9d55 | 797 | extras, NULL, err)) |
92b1551b | 798 | goto error_return; |
92b1551b MH |
799 | } |
800 | ||
801 | ret = 0; | |
802 | goto out; | |
803 | ||
804 | error_return: | |
805 | unlock_ref(lock); | |
806 | *lock_p = NULL; | |
807 | ||
808 | out: | |
809 | strbuf_release(&ref_file); | |
810 | return ret; | |
811 | } | |
812 | ||
3bc581b9 MH |
813 | struct files_ref_iterator { |
814 | struct ref_iterator base; | |
815 | ||
3bc581b9 | 816 | struct ref_iterator *iter0; |
9bc45a28 | 817 | struct repository *repo; |
3bc581b9 MH |
818 | unsigned int flags; |
819 | }; | |
7bd9bcf3 | 820 | |
3bc581b9 MH |
821 | static int files_ref_iterator_advance(struct ref_iterator *ref_iterator) |
822 | { | |
823 | struct files_ref_iterator *iter = | |
824 | (struct files_ref_iterator *)ref_iterator; | |
825 | int ok; | |
7bd9bcf3 | 826 | |
3bc581b9 | 827 | while ((ok = ref_iterator_advance(iter->iter0)) == ITER_OK) { |
0c09ec07 | 828 | if (iter->flags & DO_FOR_EACH_PER_WORKTREE_ONLY && |
71e54734 HWN |
829 | parse_worktree_ref(iter->iter0->refname, NULL, NULL, |
830 | NULL) != REF_WORKTREE_CURRENT) | |
0c09ec07 DT |
831 | continue; |
832 | ||
8dccb224 JK |
833 | if ((iter->flags & DO_FOR_EACH_OMIT_DANGLING_SYMREFS) && |
834 | (iter->iter0->flags & REF_ISSYMREF) && | |
835 | (iter->iter0->flags & REF_ISBROKEN)) | |
836 | continue; | |
837 | ||
3bc581b9 MH |
838 | if (!(iter->flags & DO_FOR_EACH_INCLUDE_BROKEN) && |
839 | !ref_resolves_to_object(iter->iter0->refname, | |
9bc45a28 | 840 | iter->repo, |
3bc581b9 MH |
841 | iter->iter0->oid, |
842 | iter->iter0->flags)) | |
843 | continue; | |
844 | ||
845 | iter->base.refname = iter->iter0->refname; | |
846 | iter->base.oid = iter->iter0->oid; | |
847 | iter->base.flags = iter->iter0->flags; | |
848 | return ITER_OK; | |
7bd9bcf3 MH |
849 | } |
850 | ||
3bc581b9 MH |
851 | iter->iter0 = NULL; |
852 | if (ref_iterator_abort(ref_iterator) != ITER_DONE) | |
853 | ok = ITER_ERROR; | |
854 | ||
855 | return ok; | |
7bd9bcf3 MH |
856 | } |
857 | ||
3bc581b9 MH |
858 | static int files_ref_iterator_peel(struct ref_iterator *ref_iterator, |
859 | struct object_id *peeled) | |
7bd9bcf3 | 860 | { |
3bc581b9 MH |
861 | struct files_ref_iterator *iter = |
862 | (struct files_ref_iterator *)ref_iterator; | |
93770590 | 863 | |
3bc581b9 MH |
864 | return ref_iterator_peel(iter->iter0, peeled); |
865 | } | |
866 | ||
867 | static int files_ref_iterator_abort(struct ref_iterator *ref_iterator) | |
868 | { | |
869 | struct files_ref_iterator *iter = | |
870 | (struct files_ref_iterator *)ref_iterator; | |
871 | int ok = ITER_DONE; | |
872 | ||
873 | if (iter->iter0) | |
874 | ok = ref_iterator_abort(iter->iter0); | |
875 | ||
3bc581b9 MH |
876 | base_ref_iterator_free(ref_iterator); |
877 | return ok; | |
878 | } | |
879 | ||
880 | static struct ref_iterator_vtable files_ref_iterator_vtable = { | |
e2f8acb6 ÆAB |
881 | .advance = files_ref_iterator_advance, |
882 | .peel = files_ref_iterator_peel, | |
883 | .abort = files_ref_iterator_abort, | |
3bc581b9 MH |
884 | }; |
885 | ||
1a769003 | 886 | static struct ref_iterator *files_ref_iterator_begin( |
37b6f6d5 | 887 | struct ref_store *ref_store, |
b269ac53 TB |
888 | const char *prefix, const char **exclude_patterns, |
889 | unsigned int flags) | |
3bc581b9 | 890 | { |
9e7ec634 | 891 | struct files_ref_store *refs; |
8738a8a4 | 892 | struct ref_iterator *loose_iter, *packed_iter, *overlay_iter; |
3bc581b9 MH |
893 | struct files_ref_iterator *iter; |
894 | struct ref_iterator *ref_iterator; | |
0a0865b8 | 895 | unsigned int required_flags = REF_STORE_READ; |
3bc581b9 | 896 | |
0a0865b8 MH |
897 | if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) |
898 | required_flags |= REF_STORE_ODB; | |
3bc581b9 | 899 | |
0a0865b8 | 900 | refs = files_downcast(ref_store, required_flags, "ref_iterator_begin"); |
9e7ec634 | 901 | |
3bc581b9 MH |
902 | /* |
903 | * We must make sure that all loose refs are read before | |
904 | * accessing the packed-refs file; this avoids a race | |
905 | * condition if loose refs are migrated to the packed-refs | |
906 | * file by a simultaneous process, but our in-memory view is | |
907 | * from before the migration. We ensure this as follows: | |
059ae35a MH |
908 | * First, we call start the loose refs iteration with its |
909 | * `prime_ref` argument set to true. This causes the loose | |
910 | * references in the subtree to be pre-read into the cache. | |
911 | * (If they've already been read, that's OK; we only need to | |
912 | * guarantee that they're read before the packed refs, not | |
913 | * *how much* before.) After that, we call | |
38b86e81 MH |
914 | * packed_ref_iterator_begin(), which internally checks |
915 | * whether the packed-ref cache is up to date with what is on | |
916 | * disk, and re-reads it if not. | |
3bc581b9 MH |
917 | */ |
918 | ||
d0f00c1a | 919 | loose_iter = cache_ref_iterator_begin(get_loose_ref_cache(refs, flags), |
8788195c | 920 | prefix, ref_store->repo, 1); |
3bc581b9 | 921 | |
38b86e81 MH |
922 | /* |
923 | * The packed-refs file might contain broken references, for | |
924 | * example an old version of a reference that points at an | |
925 | * object that has since been garbage-collected. This is OK as | |
926 | * long as there is a corresponding loose reference that | |
927 | * overrides it, and we don't want to emit an error message in | |
928 | * this case. So ask the packed_ref_store for all of its | |
929 | * references, and (if needed) do our own check for broken | |
930 | * ones in files_ref_iterator_advance(), after we have merged | |
931 | * the packed and loose references. | |
932 | */ | |
e0cc8ac8 | 933 | packed_iter = refs_ref_iterator_begin( |
b269ac53 | 934 | refs->packed_ref_store, prefix, exclude_patterns, 0, |
38b86e81 | 935 | DO_FOR_EACH_INCLUDE_BROKEN); |
3bc581b9 | 936 | |
8738a8a4 MH |
937 | overlay_iter = overlay_ref_iterator_begin(loose_iter, packed_iter); |
938 | ||
ca56dadb | 939 | CALLOC_ARRAY(iter, 1); |
8738a8a4 | 940 | ref_iterator = &iter->base; |
5e01d838 | 941 | base_ref_iterator_init(ref_iterator, &files_ref_iterator_vtable); |
8738a8a4 | 942 | iter->iter0 = overlay_iter; |
9bc45a28 | 943 | iter->repo = ref_store->repo; |
3bc581b9 MH |
944 | iter->flags = flags; |
945 | ||
946 | return ref_iterator; | |
7bd9bcf3 MH |
947 | } |
948 | ||
3fa2e91d ÆAB |
949 | /* |
950 | * Callback function for raceproof_create_file(). This function is | |
951 | * expected to do something that makes dirname(path) permanent despite | |
952 | * the fact that other processes might be cleaning up empty | |
953 | * directories at the same time. Usually it will create a file named | |
954 | * path, but alternatively it could create another file in that | |
955 | * directory, or even chdir() into that directory. The function should | |
956 | * return 0 if the action was completed successfully. On error, it | |
957 | * should return a nonzero result and set errno. | |
958 | * raceproof_create_file() treats two errno values specially: | |
959 | * | |
960 | * - ENOENT -- dirname(path) does not exist. In this case, | |
961 | * raceproof_create_file() tries creating dirname(path) | |
962 | * (and any parent directories, if necessary) and calls | |
963 | * the function again. | |
964 | * | |
965 | * - EISDIR -- the file already exists and is a directory. In this | |
966 | * case, raceproof_create_file() removes the directory if | |
967 | * it is empty (and recursively any empty directories that | |
968 | * it contains) and calls the function again. | |
969 | * | |
970 | * Any other errno causes raceproof_create_file() to fail with the | |
971 | * callback's return value and errno. | |
972 | * | |
973 | * Obviously, this function should be OK with being called again if it | |
974 | * fails with ENOENT or EISDIR. In other scenarios it will not be | |
975 | * called again. | |
976 | */ | |
977 | typedef int create_file_fn(const char *path, void *cb); | |
978 | ||
979 | /* | |
980 | * Create a file in dirname(path) by calling fn, creating leading | |
981 | * directories if necessary. Retry a few times in case we are racing | |
982 | * with another process that is trying to clean up the directory that | |
983 | * contains path. See the documentation for create_file_fn for more | |
984 | * details. | |
985 | * | |
986 | * Return the value and set the errno that resulted from the most | |
987 | * recent call of fn. fn is always called at least once, and will be | |
988 | * called more than once if it returns ENOENT or EISDIR. | |
989 | */ | |
990 | static int raceproof_create_file(const char *path, create_file_fn fn, void *cb) | |
991 | { | |
992 | /* | |
993 | * The number of times we will try to remove empty directories | |
994 | * in the way of path. This is only 1 because if another | |
995 | * process is racily creating directories that conflict with | |
996 | * us, we don't want to fight against them. | |
997 | */ | |
998 | int remove_directories_remaining = 1; | |
999 | ||
1000 | /* | |
1001 | * The number of times that we will try to create the | |
1002 | * directories containing path. We are willing to attempt this | |
1003 | * more than once, because another process could be trying to | |
1004 | * clean up empty directories at the same time as we are | |
1005 | * trying to create them. | |
1006 | */ | |
1007 | int create_directories_remaining = 3; | |
1008 | ||
1009 | /* A scratch copy of path, filled lazily if we need it: */ | |
1010 | struct strbuf path_copy = STRBUF_INIT; | |
1011 | ||
1012 | int ret, save_errno; | |
1013 | ||
1014 | /* Sanity check: */ | |
1015 | assert(*path); | |
1016 | ||
1017 | retry_fn: | |
1018 | ret = fn(path, cb); | |
1019 | save_errno = errno; | |
1020 | if (!ret) | |
1021 | goto out; | |
1022 | ||
1023 | if (errno == EISDIR && remove_directories_remaining-- > 0) { | |
1024 | /* | |
1025 | * A directory is in the way. Maybe it is empty; try | |
1026 | * to remove it: | |
1027 | */ | |
1028 | if (!path_copy.len) | |
1029 | strbuf_addstr(&path_copy, path); | |
1030 | ||
1031 | if (!remove_dir_recursively(&path_copy, REMOVE_DIR_EMPTY_ONLY)) | |
1032 | goto retry_fn; | |
1033 | } else if (errno == ENOENT && create_directories_remaining-- > 0) { | |
1034 | /* | |
1035 | * Maybe the containing directory didn't exist, or | |
1036 | * maybe it was just deleted by a process that is | |
1037 | * racing with us to clean up empty directories. Try | |
1038 | * to create it: | |
1039 | */ | |
1040 | enum scld_error scld_result; | |
1041 | ||
1042 | if (!path_copy.len) | |
1043 | strbuf_addstr(&path_copy, path); | |
1044 | ||
1045 | do { | |
1046 | scld_result = safe_create_leading_directories(path_copy.buf); | |
1047 | if (scld_result == SCLD_OK) | |
1048 | goto retry_fn; | |
1049 | } while (scld_result == SCLD_VANISHED && create_directories_remaining-- > 0); | |
1050 | } | |
1051 | ||
1052 | out: | |
1053 | strbuf_release(&path_copy); | |
1054 | errno = save_errno; | |
1055 | return ret; | |
1056 | } | |
1057 | ||
7bd9bcf3 MH |
1058 | static int remove_empty_directories(struct strbuf *path) |
1059 | { | |
1060 | /* | |
1061 | * we want to create a file but there is a directory there; | |
1062 | * if that is an empty directory (or a directory that contains | |
1063 | * only empty directories), remove them. | |
1064 | */ | |
1065 | return remove_dir_recursively(path, REMOVE_DIR_EMPTY_ONLY); | |
1066 | } | |
1067 | ||
3b5d3c98 MH |
1068 | static int create_reflock(const char *path, void *cb) |
1069 | { | |
1070 | struct lock_file *lk = cb; | |
1071 | ||
4ff0f01c MH |
1072 | return hold_lock_file_for_update_timeout( |
1073 | lk, path, LOCK_NO_DEREF, | |
1074 | get_files_ref_lock_timeout_ms()) < 0 ? -1 : 0; | |
3b5d3c98 MH |
1075 | } |
1076 | ||
7bd9bcf3 MH |
1077 | /* |
1078 | * Locks a ref returning the lock on success and NULL on failure. | |
7bd9bcf3 | 1079 | */ |
4f01e508 | 1080 | static struct ref_lock *lock_ref_oid_basic(struct files_ref_store *refs, |
52106430 | 1081 | const char *refname, |
4f01e508 | 1082 | struct strbuf *err) |
7bd9bcf3 MH |
1083 | { |
1084 | struct strbuf ref_file = STRBUF_INIT; | |
7bd9bcf3 | 1085 | struct ref_lock *lock; |
7bd9bcf3 | 1086 | |
4f01e508 | 1087 | files_assert_main_repository(refs, "lock_ref_oid_basic"); |
7bd9bcf3 MH |
1088 | assert(err); |
1089 | ||
ca56dadb | 1090 | CALLOC_ARRAY(lock, 1); |
7bd9bcf3 | 1091 | |
19e02f4f | 1092 | files_ref_path(refs, &ref_file, refname); |
2859dcd4 | 1093 | |
7bd9bcf3 MH |
1094 | /* |
1095 | * If the ref did not exist and we are creating it, make sure | |
1096 | * there is no existing packed ref whose name begins with our | |
1097 | * refname, nor a packed ref whose name is a proper prefix of | |
1098 | * our refname. | |
1099 | */ | |
1100 | if (is_null_oid(&lock->old_oid) && | |
8ec617c8 | 1101 | refs_verify_refname_available(refs->packed_ref_store, refname, |
1ae6ed23 | 1102 | NULL, NULL, err)) |
7bd9bcf3 | 1103 | goto error_return; |
7bd9bcf3 | 1104 | |
7bd9bcf3 | 1105 | lock->ref_name = xstrdup(refname); |
7bd9bcf3 | 1106 | |
ee4d8e45 | 1107 | if (raceproof_create_file(ref_file.buf, create_reflock, &lock->lk)) { |
3b5d3c98 | 1108 | unable_to_lock_message(ref_file.buf, errno, err); |
7bd9bcf3 MH |
1109 | goto error_return; |
1110 | } | |
1111 | ||
f1da24ca | 1112 | if (!refs_resolve_ref_unsafe(&refs->base, lock->ref_name, 0, |
ce14de03 | 1113 | &lock->old_oid, NULL)) |
ff7a2e4d | 1114 | oidclr(&lock->old_oid); |
7bd9bcf3 MH |
1115 | goto out; |
1116 | ||
1117 | error_return: | |
1118 | unlock_ref(lock); | |
1119 | lock = NULL; | |
1120 | ||
1121 | out: | |
1122 | strbuf_release(&ref_file); | |
7bd9bcf3 MH |
1123 | return lock; |
1124 | } | |
1125 | ||
7bd9bcf3 MH |
1126 | struct ref_to_prune { |
1127 | struct ref_to_prune *next; | |
49e99588 | 1128 | struct object_id oid; |
7bd9bcf3 MH |
1129 | char name[FLEX_ARRAY]; |
1130 | }; | |
1131 | ||
a8f0db2d MH |
1132 | enum { |
1133 | REMOVE_EMPTY_PARENTS_REF = 0x01, | |
1134 | REMOVE_EMPTY_PARENTS_REFLOG = 0x02 | |
1135 | }; | |
1136 | ||
7bd9bcf3 | 1137 | /* |
a8f0db2d MH |
1138 | * Remove empty parent directories associated with the specified |
1139 | * reference and/or its reflog, but spare [logs/]refs/ and immediate | |
1140 | * subdirs. flags is a combination of REMOVE_EMPTY_PARENTS_REF and/or | |
1141 | * REMOVE_EMPTY_PARENTS_REFLOG. | |
7bd9bcf3 | 1142 | */ |
802de3da NTND |
1143 | static void try_remove_empty_parents(struct files_ref_store *refs, |
1144 | const char *refname, | |
1145 | unsigned int flags) | |
7bd9bcf3 | 1146 | { |
8bdaecb4 | 1147 | struct strbuf buf = STRBUF_INIT; |
e9dcc305 | 1148 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 MH |
1149 | char *p, *q; |
1150 | int i; | |
8bdaecb4 MH |
1151 | |
1152 | strbuf_addstr(&buf, refname); | |
1153 | p = buf.buf; | |
7bd9bcf3 MH |
1154 | for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */ |
1155 | while (*p && *p != '/') | |
1156 | p++; | |
1157 | /* tolerate duplicate slashes; see check_refname_format() */ | |
1158 | while (*p == '/') | |
1159 | p++; | |
1160 | } | |
8bdaecb4 | 1161 | q = buf.buf + buf.len; |
a8f0db2d | 1162 | while (flags & (REMOVE_EMPTY_PARENTS_REF | REMOVE_EMPTY_PARENTS_REFLOG)) { |
7bd9bcf3 MH |
1163 | while (q > p && *q != '/') |
1164 | q--; | |
1165 | while (q > p && *(q-1) == '/') | |
1166 | q--; | |
1167 | if (q == p) | |
1168 | break; | |
8bdaecb4 | 1169 | strbuf_setlen(&buf, q - buf.buf); |
e9dcc305 NTND |
1170 | |
1171 | strbuf_reset(&sb); | |
19e02f4f | 1172 | files_ref_path(refs, &sb, buf.buf); |
e9dcc305 | 1173 | if ((flags & REMOVE_EMPTY_PARENTS_REF) && rmdir(sb.buf)) |
a8f0db2d | 1174 | flags &= ~REMOVE_EMPTY_PARENTS_REF; |
e9dcc305 NTND |
1175 | |
1176 | strbuf_reset(&sb); | |
802de3da | 1177 | files_reflog_path(refs, &sb, buf.buf); |
e9dcc305 | 1178 | if ((flags & REMOVE_EMPTY_PARENTS_REFLOG) && rmdir(sb.buf)) |
a8f0db2d | 1179 | flags &= ~REMOVE_EMPTY_PARENTS_REFLOG; |
7bd9bcf3 | 1180 | } |
8bdaecb4 | 1181 | strbuf_release(&buf); |
e9dcc305 | 1182 | strbuf_release(&sb); |
7bd9bcf3 MH |
1183 | } |
1184 | ||
1185 | /* make sure nobody touched the ref, and unlink */ | |
2f40e954 | 1186 | static void prune_ref(struct files_ref_store *refs, struct ref_to_prune *r) |
7bd9bcf3 MH |
1187 | { |
1188 | struct ref_transaction *transaction; | |
1189 | struct strbuf err = STRBUF_INIT; | |
b00f3cfa | 1190 | int ret = -1; |
7bd9bcf3 MH |
1191 | |
1192 | if (check_refname_format(r->name, 0)) | |
1193 | return; | |
1194 | ||
c6da34a6 | 1195 | transaction = ref_store_transaction_begin(&refs->base, &err); |
b00f3cfa MH |
1196 | if (!transaction) |
1197 | goto cleanup; | |
1198 | ref_transaction_add_update( | |
1199 | transaction, r->name, | |
acedcde7 | 1200 | REF_NO_DEREF | REF_HAVE_NEW | REF_HAVE_OLD | REF_IS_PRUNING, |
14228447 | 1201 | null_oid(), &r->oid, NULL); |
b00f3cfa MH |
1202 | if (ref_transaction_commit(transaction, &err)) |
1203 | goto cleanup; | |
1204 | ||
1205 | ret = 0; | |
1206 | ||
1207 | cleanup: | |
1208 | if (ret) | |
7bd9bcf3 | 1209 | error("%s", err.buf); |
7bd9bcf3 | 1210 | strbuf_release(&err); |
b00f3cfa MH |
1211 | ref_transaction_free(transaction); |
1212 | return; | |
7bd9bcf3 MH |
1213 | } |
1214 | ||
22b09cdf MH |
1215 | /* |
1216 | * Prune the loose versions of the references in the linked list | |
1217 | * `*refs_to_prune`, freeing the entries in the list as we go. | |
1218 | */ | |
1219 | static void prune_refs(struct files_ref_store *refs, struct ref_to_prune **refs_to_prune) | |
7bd9bcf3 | 1220 | { |
22b09cdf MH |
1221 | while (*refs_to_prune) { |
1222 | struct ref_to_prune *r = *refs_to_prune; | |
1223 | *refs_to_prune = r->next; | |
2f40e954 | 1224 | prune_ref(refs, r); |
22b09cdf | 1225 | free(r); |
7bd9bcf3 MH |
1226 | } |
1227 | } | |
1228 | ||
531cc4a5 MH |
1229 | /* |
1230 | * Return true if the specified reference should be packed. | |
1231 | */ | |
1232 | static int should_pack_ref(const char *refname, | |
1233 | const struct object_id *oid, unsigned int ref_flags, | |
826ae79f | 1234 | struct pack_refs_opts *opts) |
531cc4a5 | 1235 | { |
4fe42f32 JC |
1236 | struct string_list_item *item; |
1237 | ||
531cc4a5 | 1238 | /* Do not pack per-worktree refs: */ |
71e54734 HWN |
1239 | if (parse_worktree_ref(refname, NULL, NULL, NULL) != |
1240 | REF_WORKTREE_SHARED) | |
531cc4a5 MH |
1241 | return 0; |
1242 | ||
531cc4a5 MH |
1243 | /* Do not pack symbolic refs: */ |
1244 | if (ref_flags & REF_ISSYMREF) | |
1245 | return 0; | |
1246 | ||
1247 | /* Do not pack broken refs: */ | |
9bc45a28 | 1248 | if (!ref_resolves_to_object(refname, the_repository, oid, ref_flags)) |
531cc4a5 MH |
1249 | return 0; |
1250 | ||
4fe42f32 JC |
1251 | if (ref_excluded(opts->exclusions, refname)) |
1252 | return 0; | |
1253 | ||
1254 | for_each_string_list_item(item, opts->includes) | |
1255 | if (!wildmatch(item->string, refname, 0)) | |
1256 | return 1; | |
1257 | ||
1258 | return 0; | |
531cc4a5 MH |
1259 | } |
1260 | ||
826ae79f JC |
1261 | static int files_pack_refs(struct ref_store *ref_store, |
1262 | struct pack_refs_opts *opts) | |
7bd9bcf3 | 1263 | { |
00eebe35 | 1264 | struct files_ref_store *refs = |
9e7ec634 NTND |
1265 | files_downcast(ref_store, REF_STORE_WRITE | REF_STORE_ODB, |
1266 | "pack_refs"); | |
50c2d855 | 1267 | struct ref_iterator *iter; |
50c2d855 MH |
1268 | int ok; |
1269 | struct ref_to_prune *refs_to_prune = NULL; | |
3478983b | 1270 | struct strbuf err = STRBUF_INIT; |
27d03d04 MH |
1271 | struct ref_transaction *transaction; |
1272 | ||
c6da34a6 | 1273 | transaction = ref_store_transaction_begin(refs->packed_ref_store, &err); |
27d03d04 MH |
1274 | if (!transaction) |
1275 | return -1; | |
7bd9bcf3 | 1276 | |
c8bed835 | 1277 | packed_refs_lock(refs->packed_ref_store, LOCK_DIE_ON_ERROR, &err); |
50c2d855 | 1278 | |
d0f00c1a | 1279 | iter = cache_ref_iterator_begin(get_loose_ref_cache(refs, 0), NULL, |
8788195c | 1280 | the_repository, 0); |
50c2d855 MH |
1281 | while ((ok = ref_iterator_advance(iter)) == ITER_OK) { |
1282 | /* | |
1283 | * If the loose reference can be packed, add an entry | |
1284 | * in the packed ref cache. If the reference should be | |
1285 | * pruned, also add it to refs_to_prune. | |
1286 | */ | |
826ae79f | 1287 | if (!should_pack_ref(iter->refname, iter->oid, iter->flags, opts)) |
50c2d855 MH |
1288 | continue; |
1289 | ||
1290 | /* | |
27d03d04 MH |
1291 | * Add a reference creation for this reference to the |
1292 | * packed-refs transaction: | |
50c2d855 | 1293 | */ |
27d03d04 | 1294 | if (ref_transaction_update(transaction, iter->refname, |
89f3bbdd | 1295 | iter->oid, NULL, |
91774afc | 1296 | REF_NO_DEREF, NULL, &err)) |
27d03d04 MH |
1297 | die("failure preparing to create packed reference %s: %s", |
1298 | iter->refname, err.buf); | |
50c2d855 MH |
1299 | |
1300 | /* Schedule the loose reference for pruning if requested. */ | |
826ae79f | 1301 | if ((opts->flags & PACK_REFS_PRUNE)) { |
50c2d855 MH |
1302 | struct ref_to_prune *n; |
1303 | FLEX_ALLOC_STR(n, name, iter->refname); | |
49e99588 | 1304 | oidcpy(&n->oid, iter->oid); |
50c2d855 MH |
1305 | n->next = refs_to_prune; |
1306 | refs_to_prune = n; | |
1307 | } | |
1308 | } | |
1309 | if (ok != ITER_DONE) | |
1310 | die("error while iterating over references"); | |
7bd9bcf3 | 1311 | |
27d03d04 MH |
1312 | if (ref_transaction_commit(transaction, &err)) |
1313 | die("unable to write new packed-refs: %s", err.buf); | |
1314 | ||
1315 | ref_transaction_free(transaction); | |
1316 | ||
42c7f7ff | 1317 | packed_refs_unlock(refs->packed_ref_store); |
7bd9bcf3 | 1318 | |
22b09cdf | 1319 | prune_refs(refs, &refs_to_prune); |
3478983b | 1320 | strbuf_release(&err); |
7bd9bcf3 MH |
1321 | return 0; |
1322 | } | |
1323 | ||
7bd9bcf3 MH |
1324 | /* |
1325 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
1326 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
1327 | * | |
1328 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
1329 | * live into logs/refs. | |
1330 | */ | |
a5c1efd6 | 1331 | #define TMP_RENAMED_LOG "refs/.tmp-renamed-log" |
7bd9bcf3 | 1332 | |
e9dcc305 NTND |
1333 | struct rename_cb { |
1334 | const char *tmp_renamed_log; | |
1335 | int true_errno; | |
1336 | }; | |
1337 | ||
1338 | static int rename_tmp_log_callback(const char *path, void *cb_data) | |
7bd9bcf3 | 1339 | { |
e9dcc305 | 1340 | struct rename_cb *cb = cb_data; |
7bd9bcf3 | 1341 | |
e9dcc305 | 1342 | if (rename(cb->tmp_renamed_log, path)) { |
6a7f3631 MH |
1343 | /* |
1344 | * rename(a, b) when b is an existing directory ought | |
1345 | * to result in ISDIR, but Solaris 5.8 gives ENOTDIR. | |
1346 | * Sheesh. Record the true errno for error reporting, | |
1347 | * but report EISDIR to raceproof_create_file() so | |
1348 | * that it knows to retry. | |
1349 | */ | |
e9dcc305 | 1350 | cb->true_errno = errno; |
6a7f3631 MH |
1351 | if (errno == ENOTDIR) |
1352 | errno = EISDIR; | |
1353 | return -1; | |
1354 | } else { | |
1355 | return 0; | |
7bd9bcf3 | 1356 | } |
6a7f3631 | 1357 | } |
7bd9bcf3 | 1358 | |
802de3da | 1359 | static int rename_tmp_log(struct files_ref_store *refs, const char *newrefname) |
6a7f3631 | 1360 | { |
e9dcc305 NTND |
1361 | struct strbuf path = STRBUF_INIT; |
1362 | struct strbuf tmp = STRBUF_INIT; | |
1363 | struct rename_cb cb; | |
1364 | int ret; | |
6a7f3631 | 1365 | |
802de3da NTND |
1366 | files_reflog_path(refs, &path, newrefname); |
1367 | files_reflog_path(refs, &tmp, TMP_RENAMED_LOG); | |
e9dcc305 NTND |
1368 | cb.tmp_renamed_log = tmp.buf; |
1369 | ret = raceproof_create_file(path.buf, rename_tmp_log_callback, &cb); | |
6a7f3631 MH |
1370 | if (ret) { |
1371 | if (errno == EISDIR) | |
e9dcc305 | 1372 | error("directory not empty: %s", path.buf); |
6a7f3631 | 1373 | else |
990c98d2 | 1374 | error("unable to move logfile %s to %s: %s", |
e9dcc305 NTND |
1375 | tmp.buf, path.buf, |
1376 | strerror(cb.true_errno)); | |
7bd9bcf3 | 1377 | } |
6a7f3631 | 1378 | |
e9dcc305 NTND |
1379 | strbuf_release(&path); |
1380 | strbuf_release(&tmp); | |
7bd9bcf3 MH |
1381 | return ret; |
1382 | } | |
1383 | ||
7bd9bcf3 | 1384 | static int write_ref_to_lockfile(struct ref_lock *lock, |
e9706a18 HWN |
1385 | const struct object_id *oid, |
1386 | int skip_oid_verification, struct strbuf *err); | |
f18a7892 MH |
1387 | static int commit_ref_update(struct files_ref_store *refs, |
1388 | struct ref_lock *lock, | |
4417df8c | 1389 | const struct object_id *oid, const char *logmsg, |
5d9b2de4 | 1390 | struct strbuf *err); |
7bd9bcf3 | 1391 | |
c339ff69 | 1392 | /* |
52106430 ÆAB |
1393 | * Emit a better error message than lockfile.c's |
1394 | * unable_to_lock_message() would in case there is a D/F conflict with | |
1395 | * another existing reference. If there would be a conflict, emit an error | |
c339ff69 ÆAB |
1396 | * message and return false; otherwise, return true. |
1397 | * | |
1398 | * Note that this function is not safe against all races with other | |
52106430 ÆAB |
1399 | * processes, and that's not its job. We'll emit a more verbose error on D/f |
1400 | * conflicts if we get past it into lock_ref_oid_basic(). | |
c339ff69 ÆAB |
1401 | */ |
1402 | static int refs_rename_ref_available(struct ref_store *refs, | |
1403 | const char *old_refname, | |
1404 | const char *new_refname) | |
1405 | { | |
1406 | struct string_list skip = STRING_LIST_INIT_NODUP; | |
1407 | struct strbuf err = STRBUF_INIT; | |
1408 | int ok; | |
1409 | ||
1410 | string_list_insert(&skip, old_refname); | |
1411 | ok = !refs_verify_refname_available(refs, new_refname, | |
1412 | NULL, &skip, &err); | |
1413 | if (!ok) | |
1414 | error("%s", err.buf); | |
1415 | ||
1416 | string_list_clear(&skip, 0); | |
1417 | strbuf_release(&err); | |
1418 | return ok; | |
1419 | } | |
1420 | ||
52d59cc6 | 1421 | static int files_copy_or_rename_ref(struct ref_store *ref_store, |
9b6b40d9 | 1422 | const char *oldrefname, const char *newrefname, |
52d59cc6 | 1423 | const char *logmsg, int copy) |
7bd9bcf3 | 1424 | { |
9b6b40d9 | 1425 | struct files_ref_store *refs = |
9e7ec634 | 1426 | files_downcast(ref_store, REF_STORE_WRITE, "rename_ref"); |
e0ae2447 | 1427 | struct object_id orig_oid; |
7bd9bcf3 MH |
1428 | int flag = 0, logmoved = 0; |
1429 | struct ref_lock *lock; | |
1430 | struct stat loginfo; | |
e9dcc305 NTND |
1431 | struct strbuf sb_oldref = STRBUF_INIT; |
1432 | struct strbuf sb_newref = STRBUF_INIT; | |
1433 | struct strbuf tmp_renamed_log = STRBUF_INIT; | |
1434 | int log, ret; | |
7bd9bcf3 MH |
1435 | struct strbuf err = STRBUF_INIT; |
1436 | ||
802de3da NTND |
1437 | files_reflog_path(refs, &sb_oldref, oldrefname); |
1438 | files_reflog_path(refs, &sb_newref, newrefname); | |
1439 | files_reflog_path(refs, &tmp_renamed_log, TMP_RENAMED_LOG); | |
e9dcc305 NTND |
1440 | |
1441 | log = !lstat(sb_oldref.buf, &loginfo); | |
0a3f07d6 NTND |
1442 | if (log && S_ISLNK(loginfo.st_mode)) { |
1443 | ret = error("reflog for %s is a symlink", oldrefname); | |
1444 | goto out; | |
1445 | } | |
7bd9bcf3 | 1446 | |
2f40e954 NTND |
1447 | if (!refs_resolve_ref_unsafe(&refs->base, oldrefname, |
1448 | RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE, | |
ce14de03 | 1449 | &orig_oid, &flag)) { |
0a3f07d6 NTND |
1450 | ret = error("refname %s not found", oldrefname); |
1451 | goto out; | |
1452 | } | |
e711b1af | 1453 | |
0a3f07d6 | 1454 | if (flag & REF_ISSYMREF) { |
52d59cc6 SD |
1455 | if (copy) |
1456 | ret = error("refname %s is a symbolic ref, copying it is not supported", | |
1457 | oldrefname); | |
1458 | else | |
1459 | ret = error("refname %s is a symbolic ref, renaming it is not supported", | |
1460 | oldrefname); | |
0a3f07d6 NTND |
1461 | goto out; |
1462 | } | |
7d2df051 | 1463 | if (!refs_rename_ref_available(&refs->base, oldrefname, newrefname)) { |
0a3f07d6 NTND |
1464 | ret = 1; |
1465 | goto out; | |
1466 | } | |
7bd9bcf3 | 1467 | |
52d59cc6 | 1468 | if (!copy && log && rename(sb_oldref.buf, tmp_renamed_log.buf)) { |
a5c1efd6 | 1469 | ret = error("unable to move logfile logs/%s to logs/"TMP_RENAMED_LOG": %s", |
0a3f07d6 NTND |
1470 | oldrefname, strerror(errno)); |
1471 | goto out; | |
1472 | } | |
7bd9bcf3 | 1473 | |
52d59cc6 SD |
1474 | if (copy && log && copy_file(tmp_renamed_log.buf, sb_oldref.buf, 0644)) { |
1475 | ret = error("unable to copy logfile logs/%s to logs/"TMP_RENAMED_LOG": %s", | |
1476 | oldrefname, strerror(errno)); | |
1477 | goto out; | |
1478 | } | |
1479 | ||
1480 | if (!copy && refs_delete_ref(&refs->base, logmsg, oldrefname, | |
91774afc | 1481 | &orig_oid, REF_NO_DEREF)) { |
7bd9bcf3 MH |
1482 | error("unable to delete old %s", oldrefname); |
1483 | goto rollback; | |
1484 | } | |
1485 | ||
12fd3496 | 1486 | /* |
4417df8c | 1487 | * Since we are doing a shallow lookup, oid is not the |
1488 | * correct value to pass to delete_ref as old_oid. But that | |
1489 | * doesn't matter, because an old_oid check wouldn't add to | |
12fd3496 DT |
1490 | * the safety anyway; we want to delete the reference whatever |
1491 | * its current value. | |
1492 | */ | |
f1da24ca | 1493 | if (!copy && refs_resolve_ref_unsafe(&refs->base, newrefname, |
76887df0 | 1494 | RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE, |
ce14de03 | 1495 | NULL, NULL) && |
2f40e954 | 1496 | refs_delete_ref(&refs->base, NULL, newrefname, |
91774afc | 1497 | NULL, REF_NO_DEREF)) { |
58364324 | 1498 | if (errno == EISDIR) { |
7bd9bcf3 MH |
1499 | struct strbuf path = STRBUF_INIT; |
1500 | int result; | |
1501 | ||
19e02f4f | 1502 | files_ref_path(refs, &path, newrefname); |
7bd9bcf3 MH |
1503 | result = remove_empty_directories(&path); |
1504 | strbuf_release(&path); | |
1505 | ||
1506 | if (result) { | |
1507 | error("Directory not empty: %s", newrefname); | |
1508 | goto rollback; | |
1509 | } | |
1510 | } else { | |
1511 | error("unable to delete existing %s", newrefname); | |
1512 | goto rollback; | |
1513 | } | |
1514 | } | |
1515 | ||
802de3da | 1516 | if (log && rename_tmp_log(refs, newrefname)) |
7bd9bcf3 MH |
1517 | goto rollback; |
1518 | ||
1519 | logmoved = log; | |
1520 | ||
52106430 | 1521 | lock = lock_ref_oid_basic(refs, newrefname, &err); |
7bd9bcf3 | 1522 | if (!lock) { |
52d59cc6 SD |
1523 | if (copy) |
1524 | error("unable to copy '%s' to '%s': %s", oldrefname, newrefname, err.buf); | |
1525 | else | |
1526 | error("unable to rename '%s' to '%s': %s", oldrefname, newrefname, err.buf); | |
7bd9bcf3 MH |
1527 | strbuf_release(&err); |
1528 | goto rollback; | |
1529 | } | |
4417df8c | 1530 | oidcpy(&lock->old_oid, &orig_oid); |
7bd9bcf3 | 1531 | |
e9706a18 | 1532 | if (write_ref_to_lockfile(lock, &orig_oid, 0, &err) || |
4417df8c | 1533 | commit_ref_update(refs, lock, &orig_oid, logmsg, &err)) { |
7bd9bcf3 MH |
1534 | error("unable to write current sha1 into %s: %s", newrefname, err.buf); |
1535 | strbuf_release(&err); | |
1536 | goto rollback; | |
1537 | } | |
1538 | ||
0a3f07d6 NTND |
1539 | ret = 0; |
1540 | goto out; | |
7bd9bcf3 MH |
1541 | |
1542 | rollback: | |
52106430 | 1543 | lock = lock_ref_oid_basic(refs, oldrefname, &err); |
7bd9bcf3 MH |
1544 | if (!lock) { |
1545 | error("unable to lock %s for rollback: %s", oldrefname, err.buf); | |
1546 | strbuf_release(&err); | |
1547 | goto rollbacklog; | |
1548 | } | |
1549 | ||
1550 | flag = log_all_ref_updates; | |
341fb286 | 1551 | log_all_ref_updates = LOG_REFS_NONE; |
e9706a18 | 1552 | if (write_ref_to_lockfile(lock, &orig_oid, 0, &err) || |
4417df8c | 1553 | commit_ref_update(refs, lock, &orig_oid, NULL, &err)) { |
7bd9bcf3 MH |
1554 | error("unable to write current sha1 into %s: %s", oldrefname, err.buf); |
1555 | strbuf_release(&err); | |
1556 | } | |
1557 | log_all_ref_updates = flag; | |
1558 | ||
1559 | rollbacklog: | |
e9dcc305 | 1560 | if (logmoved && rename(sb_newref.buf, sb_oldref.buf)) |
7bd9bcf3 MH |
1561 | error("unable to restore logfile %s from %s: %s", |
1562 | oldrefname, newrefname, strerror(errno)); | |
1563 | if (!logmoved && log && | |
e9dcc305 | 1564 | rename(tmp_renamed_log.buf, sb_oldref.buf)) |
a5c1efd6 | 1565 | error("unable to restore logfile %s from logs/"TMP_RENAMED_LOG": %s", |
7bd9bcf3 | 1566 | oldrefname, strerror(errno)); |
0a3f07d6 NTND |
1567 | ret = 1; |
1568 | out: | |
e9dcc305 NTND |
1569 | strbuf_release(&sb_newref); |
1570 | strbuf_release(&sb_oldref); | |
1571 | strbuf_release(&tmp_renamed_log); | |
1572 | ||
0a3f07d6 | 1573 | return ret; |
7bd9bcf3 MH |
1574 | } |
1575 | ||
52d59cc6 SD |
1576 | static int files_rename_ref(struct ref_store *ref_store, |
1577 | const char *oldrefname, const char *newrefname, | |
1578 | const char *logmsg) | |
1579 | { | |
1580 | return files_copy_or_rename_ref(ref_store, oldrefname, | |
1581 | newrefname, logmsg, 0); | |
1582 | } | |
1583 | ||
1584 | static int files_copy_ref(struct ref_store *ref_store, | |
1585 | const char *oldrefname, const char *newrefname, | |
1586 | const char *logmsg) | |
1587 | { | |
1588 | return files_copy_or_rename_ref(ref_store, oldrefname, | |
1589 | newrefname, logmsg, 1); | |
1590 | } | |
1591 | ||
83a3069a | 1592 | static int close_ref_gently(struct ref_lock *lock) |
7bd9bcf3 | 1593 | { |
ee4d8e45 | 1594 | if (close_lock_file_gently(&lock->lk)) |
7bd9bcf3 MH |
1595 | return -1; |
1596 | return 0; | |
1597 | } | |
1598 | ||
1599 | static int commit_ref(struct ref_lock *lock) | |
1600 | { | |
ee4d8e45 | 1601 | char *path = get_locked_file_path(&lock->lk); |
5387c0d8 MH |
1602 | struct stat st; |
1603 | ||
1604 | if (!lstat(path, &st) && S_ISDIR(st.st_mode)) { | |
1605 | /* | |
1606 | * There is a directory at the path we want to rename | |
1607 | * the lockfile to. Hopefully it is empty; try to | |
1608 | * delete it. | |
1609 | */ | |
1610 | size_t len = strlen(path); | |
1611 | struct strbuf sb_path = STRBUF_INIT; | |
1612 | ||
1613 | strbuf_attach(&sb_path, path, len, len); | |
1614 | ||
1615 | /* | |
1616 | * If this fails, commit_lock_file() will also fail | |
1617 | * and will report the problem. | |
1618 | */ | |
1619 | remove_empty_directories(&sb_path); | |
1620 | strbuf_release(&sb_path); | |
1621 | } else { | |
1622 | free(path); | |
1623 | } | |
1624 | ||
ee4d8e45 | 1625 | if (commit_lock_file(&lock->lk)) |
7bd9bcf3 MH |
1626 | return -1; |
1627 | return 0; | |
1628 | } | |
1629 | ||
1fb0c809 MH |
1630 | static int open_or_create_logfile(const char *path, void *cb) |
1631 | { | |
1632 | int *fd = cb; | |
1633 | ||
1634 | *fd = open(path, O_APPEND | O_WRONLY | O_CREAT, 0666); | |
1635 | return (*fd < 0) ? -1 : 0; | |
1636 | } | |
1637 | ||
7bd9bcf3 | 1638 | /* |
4533e534 MH |
1639 | * Create a reflog for a ref. If force_create = 0, only create the |
1640 | * reflog for certain refs (those for which should_autocreate_reflog | |
1641 | * returns non-zero). Otherwise, create it regardless of the reference | |
1642 | * name. If the logfile already existed or was created, return 0 and | |
1643 | * set *logfd to the file descriptor opened for appending to the file. | |
1644 | * If no logfile exists and we decided not to create one, return 0 and | |
1645 | * set *logfd to -1. On failure, fill in *err, set *logfd to -1, and | |
1646 | * return -1. | |
7bd9bcf3 | 1647 | */ |
802de3da NTND |
1648 | static int log_ref_setup(struct files_ref_store *refs, |
1649 | const char *refname, int force_create, | |
4533e534 | 1650 | int *logfd, struct strbuf *err) |
7bd9bcf3 | 1651 | { |
802de3da NTND |
1652 | struct strbuf logfile_sb = STRBUF_INIT; |
1653 | char *logfile; | |
1654 | ||
1655 | files_reflog_path(refs, &logfile_sb, refname); | |
1656 | logfile = strbuf_detach(&logfile_sb, NULL); | |
7bd9bcf3 | 1657 | |
7bd9bcf3 | 1658 | if (force_create || should_autocreate_reflog(refname)) { |
4533e534 | 1659 | if (raceproof_create_file(logfile, open_or_create_logfile, logfd)) { |
1fb0c809 MH |
1660 | if (errno == ENOENT) |
1661 | strbuf_addf(err, "unable to create directory for '%s': " | |
4533e534 | 1662 | "%s", logfile, strerror(errno)); |
1fb0c809 MH |
1663 | else if (errno == EISDIR) |
1664 | strbuf_addf(err, "there are still logs under '%s'", | |
4533e534 | 1665 | logfile); |
1fb0c809 | 1666 | else |
854bda6b | 1667 | strbuf_addf(err, "unable to append to '%s': %s", |
4533e534 | 1668 | logfile, strerror(errno)); |
7bd9bcf3 | 1669 | |
4533e534 | 1670 | goto error; |
7bd9bcf3 | 1671 | } |
854bda6b | 1672 | } else { |
35cf94ea | 1673 | *logfd = open(logfile, O_APPEND | O_WRONLY); |
e404f459 | 1674 | if (*logfd < 0) { |
854bda6b MH |
1675 | if (errno == ENOENT || errno == EISDIR) { |
1676 | /* | |
1677 | * The logfile doesn't already exist, | |
1678 | * but that is not an error; it only | |
1679 | * means that we won't write log | |
1680 | * entries to it. | |
1681 | */ | |
1682 | ; | |
1683 | } else { | |
1684 | strbuf_addf(err, "unable to append to '%s': %s", | |
4533e534 MH |
1685 | logfile, strerror(errno)); |
1686 | goto error; | |
854bda6b | 1687 | } |
7bd9bcf3 MH |
1688 | } |
1689 | } | |
1690 | ||
e404f459 | 1691 | if (*logfd >= 0) |
4533e534 | 1692 | adjust_shared_perm(logfile); |
854bda6b | 1693 | |
4533e534 | 1694 | free(logfile); |
7bd9bcf3 | 1695 | return 0; |
7bd9bcf3 | 1696 | |
4533e534 MH |
1697 | error: |
1698 | free(logfile); | |
1699 | return -1; | |
7bd9bcf3 | 1700 | } |
7bd9bcf3 | 1701 | |
7b089120 | 1702 | static int files_create_reflog(struct ref_store *ref_store, const char *refname, |
e3688bd6 | 1703 | struct strbuf *err) |
7bd9bcf3 | 1704 | { |
802de3da | 1705 | struct files_ref_store *refs = |
9e7ec634 | 1706 | files_downcast(ref_store, REF_STORE_WRITE, "create_reflog"); |
e404f459 | 1707 | int fd; |
7bd9bcf3 | 1708 | |
7b089120 | 1709 | if (log_ref_setup(refs, refname, 1, &fd, err)) |
4533e534 MH |
1710 | return -1; |
1711 | ||
e404f459 MH |
1712 | if (fd >= 0) |
1713 | close(fd); | |
4533e534 MH |
1714 | |
1715 | return 0; | |
7bd9bcf3 MH |
1716 | } |
1717 | ||
4417df8c | 1718 | static int log_ref_write_fd(int fd, const struct object_id *old_oid, |
1719 | const struct object_id *new_oid, | |
7bd9bcf3 MH |
1720 | const char *committer, const char *msg) |
1721 | { | |
80a6c207 BP |
1722 | struct strbuf sb = STRBUF_INIT; |
1723 | int ret = 0; | |
1724 | ||
1725 | strbuf_addf(&sb, "%s %s %s", oid_to_hex(old_oid), oid_to_hex(new_oid), committer); | |
25429fed HWN |
1726 | if (msg && *msg) { |
1727 | strbuf_addch(&sb, '\t'); | |
523fa69c | 1728 | strbuf_addstr(&sb, msg); |
25429fed | 1729 | } |
80a6c207 BP |
1730 | strbuf_addch(&sb, '\n'); |
1731 | if (write_in_full(fd, sb.buf, sb.len) < 0) | |
1732 | ret = -1; | |
1733 | strbuf_release(&sb); | |
1734 | return ret; | |
7bd9bcf3 MH |
1735 | } |
1736 | ||
802de3da | 1737 | static int files_log_ref_write(struct files_ref_store *refs, |
4417df8c | 1738 | const char *refname, const struct object_id *old_oid, |
1739 | const struct object_id *new_oid, const char *msg, | |
11f8457f | 1740 | int flags, struct strbuf *err) |
7bd9bcf3 | 1741 | { |
e404f459 | 1742 | int logfd, result; |
7bd9bcf3 | 1743 | |
341fb286 CW |
1744 | if (log_all_ref_updates == LOG_REFS_UNSET) |
1745 | log_all_ref_updates = is_bare_repository() ? LOG_REFS_NONE : LOG_REFS_NORMAL; | |
7bd9bcf3 | 1746 | |
802de3da NTND |
1747 | result = log_ref_setup(refs, refname, |
1748 | flags & REF_FORCE_CREATE_REFLOG, | |
4533e534 | 1749 | &logfd, err); |
7bd9bcf3 MH |
1750 | |
1751 | if (result) | |
1752 | return result; | |
1753 | ||
7bd9bcf3 MH |
1754 | if (logfd < 0) |
1755 | return 0; | |
4417df8c | 1756 | result = log_ref_write_fd(logfd, old_oid, new_oid, |
7bd9bcf3 MH |
1757 | git_committer_info(0), msg); |
1758 | if (result) { | |
e9dcc305 | 1759 | struct strbuf sb = STRBUF_INIT; |
87b21e05 MH |
1760 | int save_errno = errno; |
1761 | ||
802de3da | 1762 | files_reflog_path(refs, &sb, refname); |
87b21e05 | 1763 | strbuf_addf(err, "unable to append to '%s': %s", |
e9dcc305 NTND |
1764 | sb.buf, strerror(save_errno)); |
1765 | strbuf_release(&sb); | |
7bd9bcf3 MH |
1766 | close(logfd); |
1767 | return -1; | |
1768 | } | |
1769 | if (close(logfd)) { | |
e9dcc305 | 1770 | struct strbuf sb = STRBUF_INIT; |
87b21e05 MH |
1771 | int save_errno = errno; |
1772 | ||
802de3da | 1773 | files_reflog_path(refs, &sb, refname); |
87b21e05 | 1774 | strbuf_addf(err, "unable to append to '%s': %s", |
e9dcc305 NTND |
1775 | sb.buf, strerror(save_errno)); |
1776 | strbuf_release(&sb); | |
7bd9bcf3 MH |
1777 | return -1; |
1778 | } | |
1779 | return 0; | |
1780 | } | |
1781 | ||
7bd9bcf3 | 1782 | /* |
78fb4579 MH |
1783 | * Write oid into the open lockfile, then close the lockfile. On |
1784 | * errors, rollback the lockfile, fill in *err and return -1. | |
7bd9bcf3 MH |
1785 | */ |
1786 | static int write_ref_to_lockfile(struct ref_lock *lock, | |
e9706a18 HWN |
1787 | const struct object_id *oid, |
1788 | int skip_oid_verification, struct strbuf *err) | |
7bd9bcf3 MH |
1789 | { |
1790 | static char term = '\n'; | |
1791 | struct object *o; | |
1792 | int fd; | |
1793 | ||
e9706a18 HWN |
1794 | if (!skip_oid_verification) { |
1795 | o = parse_object(the_repository, oid); | |
1796 | if (!o) { | |
1797 | strbuf_addf( | |
1798 | err, | |
1799 | "trying to write ref '%s' with nonexistent object %s", | |
1800 | lock->ref_name, oid_to_hex(oid)); | |
1801 | unlock_ref(lock); | |
1802 | return -1; | |
1803 | } | |
1804 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1805 | strbuf_addf( | |
1806 | err, | |
1807 | "trying to write non-commit object %s to branch '%s'", | |
1808 | oid_to_hex(oid), lock->ref_name); | |
1809 | unlock_ref(lock); | |
1810 | return -1; | |
1811 | } | |
7bd9bcf3 | 1812 | } |
ee4d8e45 | 1813 | fd = get_lock_file_fd(&lock->lk); |
2ae2e2a1 | 1814 | if (write_in_full(fd, oid_to_hex(oid), the_hash_algo->hexsz) < 0 || |
06f46f23 | 1815 | write_in_full(fd, &term, 1) < 0 || |
bc22d845 | 1816 | fsync_component(FSYNC_COMPONENT_REFERENCE, get_lock_file_fd(&lock->lk)) < 0 || |
83a3069a | 1817 | close_ref_gently(lock) < 0) { |
7bd9bcf3 | 1818 | strbuf_addf(err, |
ee4d8e45 | 1819 | "couldn't write '%s'", get_lock_file_path(&lock->lk)); |
7bd9bcf3 MH |
1820 | unlock_ref(lock); |
1821 | return -1; | |
1822 | } | |
1823 | return 0; | |
1824 | } | |
1825 | ||
1826 | /* | |
1827 | * Commit a change to a loose reference that has already been written | |
1828 | * to the loose reference lockfile. Also update the reflogs if | |
1829 | * necessary, using the specified lockmsg (which can be NULL). | |
1830 | */ | |
f18a7892 MH |
1831 | static int commit_ref_update(struct files_ref_store *refs, |
1832 | struct ref_lock *lock, | |
4417df8c | 1833 | const struct object_id *oid, const char *logmsg, |
5d9b2de4 | 1834 | struct strbuf *err) |
7bd9bcf3 | 1835 | { |
32c597e7 | 1836 | files_assert_main_repository(refs, "commit_ref_update"); |
00eebe35 MH |
1837 | |
1838 | clear_loose_ref_cache(refs); | |
802de3da | 1839 | if (files_log_ref_write(refs, lock->ref_name, |
4417df8c | 1840 | &lock->old_oid, oid, |
81b1b6d4 | 1841 | logmsg, 0, err)) { |
7bd9bcf3 | 1842 | char *old_msg = strbuf_detach(err, NULL); |
0568c8e9 | 1843 | strbuf_addf(err, "cannot update the ref '%s': %s", |
7bd9bcf3 MH |
1844 | lock->ref_name, old_msg); |
1845 | free(old_msg); | |
1846 | unlock_ref(lock); | |
1847 | return -1; | |
1848 | } | |
7a418f3a MH |
1849 | |
1850 | if (strcmp(lock->ref_name, "HEAD") != 0) { | |
7bd9bcf3 MH |
1851 | /* |
1852 | * Special hack: If a branch is updated directly and HEAD | |
1853 | * points to it (may happen on the remote side of a push | |
1854 | * for example) then logically the HEAD reflog should be | |
1855 | * updated too. | |
1856 | * A generic solution implies reverse symref information, | |
1857 | * but finding all symrefs pointing to the given branch | |
1858 | * would be rather costly for this rare event (the direct | |
1859 | * update of a branch) to be worth it. So let's cheat and | |
1860 | * check with HEAD only which should cover 99% of all usage | |
1861 | * scenarios (even 100% of the default ones). | |
1862 | */ | |
7bd9bcf3 MH |
1863 | int head_flag; |
1864 | const char *head_ref; | |
7a418f3a | 1865 | |
2f40e954 NTND |
1866 | head_ref = refs_resolve_ref_unsafe(&refs->base, "HEAD", |
1867 | RESOLVE_REF_READING, | |
ce14de03 | 1868 | NULL, &head_flag); |
7bd9bcf3 MH |
1869 | if (head_ref && (head_flag & REF_ISSYMREF) && |
1870 | !strcmp(head_ref, lock->ref_name)) { | |
1871 | struct strbuf log_err = STRBUF_INIT; | |
802de3da | 1872 | if (files_log_ref_write(refs, "HEAD", |
4417df8c | 1873 | &lock->old_oid, oid, |
802de3da | 1874 | logmsg, 0, &log_err)) { |
7bd9bcf3 MH |
1875 | error("%s", log_err.buf); |
1876 | strbuf_release(&log_err); | |
1877 | } | |
1878 | } | |
1879 | } | |
7a418f3a | 1880 | |
7bd9bcf3 | 1881 | if (commit_ref(lock)) { |
0568c8e9 | 1882 | strbuf_addf(err, "couldn't set '%s'", lock->ref_name); |
7bd9bcf3 MH |
1883 | unlock_ref(lock); |
1884 | return -1; | |
1885 | } | |
1886 | ||
1887 | unlock_ref(lock); | |
1888 | return 0; | |
1889 | } | |
1890 | ||
370e5ad6 | 1891 | static int create_ref_symlink(struct ref_lock *lock, const char *target) |
7bd9bcf3 | 1892 | { |
370e5ad6 | 1893 | int ret = -1; |
7bd9bcf3 | 1894 | #ifndef NO_SYMLINK_HEAD |
ee4d8e45 | 1895 | char *ref_path = get_locked_file_path(&lock->lk); |
370e5ad6 JK |
1896 | unlink(ref_path); |
1897 | ret = symlink(target, ref_path); | |
1898 | free(ref_path); | |
1899 | ||
1900 | if (ret) | |
7bd9bcf3 | 1901 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
7bd9bcf3 | 1902 | #endif |
370e5ad6 JK |
1903 | return ret; |
1904 | } | |
7bd9bcf3 | 1905 | |
802de3da NTND |
1906 | static void update_symref_reflog(struct files_ref_store *refs, |
1907 | struct ref_lock *lock, const char *refname, | |
370e5ad6 JK |
1908 | const char *target, const char *logmsg) |
1909 | { | |
1910 | struct strbuf err = STRBUF_INIT; | |
4417df8c | 1911 | struct object_id new_oid; |
76887df0 | 1912 | |
2f40e954 | 1913 | if (logmsg && |
f1da24ca | 1914 | refs_resolve_ref_unsafe(&refs->base, target, |
ce14de03 | 1915 | RESOLVE_REF_READING, &new_oid, NULL) && |
4417df8c | 1916 | files_log_ref_write(refs, refname, &lock->old_oid, |
1917 | &new_oid, logmsg, 0, &err)) { | |
7bd9bcf3 MH |
1918 | error("%s", err.buf); |
1919 | strbuf_release(&err); | |
1920 | } | |
370e5ad6 | 1921 | } |
7bd9bcf3 | 1922 | |
802de3da NTND |
1923 | static int create_symref_locked(struct files_ref_store *refs, |
1924 | struct ref_lock *lock, const char *refname, | |
370e5ad6 JK |
1925 | const char *target, const char *logmsg) |
1926 | { | |
1927 | if (prefer_symlink_refs && !create_ref_symlink(lock, target)) { | |
802de3da | 1928 | update_symref_reflog(refs, lock, refname, target, logmsg); |
370e5ad6 JK |
1929 | return 0; |
1930 | } | |
1931 | ||
ee4d8e45 | 1932 | if (!fdopen_lock_file(&lock->lk, "w")) |
370e5ad6 | 1933 | return error("unable to fdopen %s: %s", |
7f0dc799 | 1934 | get_lock_file_path(&lock->lk), strerror(errno)); |
370e5ad6 | 1935 | |
802de3da | 1936 | update_symref_reflog(refs, lock, refname, target, logmsg); |
396da8f7 | 1937 | |
370e5ad6 | 1938 | /* no error check; commit_ref will check ferror */ |
7f0dc799 | 1939 | fprintf(get_lock_file_fp(&lock->lk), "ref: %s\n", target); |
370e5ad6 JK |
1940 | if (commit_ref(lock) < 0) |
1941 | return error("unable to write symref for %s: %s", refname, | |
1942 | strerror(errno)); | |
7bd9bcf3 MH |
1943 | return 0; |
1944 | } | |
1945 | ||
284689ba MH |
1946 | static int files_create_symref(struct ref_store *ref_store, |
1947 | const char *refname, const char *target, | |
1948 | const char *logmsg) | |
370e5ad6 | 1949 | { |
7eb27cdf | 1950 | struct files_ref_store *refs = |
9e7ec634 | 1951 | files_downcast(ref_store, REF_STORE_WRITE, "create_symref"); |
370e5ad6 JK |
1952 | struct strbuf err = STRBUF_INIT; |
1953 | struct ref_lock *lock; | |
1954 | int ret; | |
1955 | ||
52106430 | 1956 | lock = lock_ref_oid_basic(refs, refname, &err); |
370e5ad6 JK |
1957 | if (!lock) { |
1958 | error("%s", err.buf); | |
1959 | strbuf_release(&err); | |
1960 | return -1; | |
1961 | } | |
1962 | ||
802de3da | 1963 | ret = create_symref_locked(refs, lock, refname, target, logmsg); |
370e5ad6 JK |
1964 | unlock_ref(lock); |
1965 | return ret; | |
1966 | } | |
1967 | ||
e3688bd6 DT |
1968 | static int files_reflog_exists(struct ref_store *ref_store, |
1969 | const char *refname) | |
7bd9bcf3 | 1970 | { |
802de3da | 1971 | struct files_ref_store *refs = |
9e7ec634 | 1972 | files_downcast(ref_store, REF_STORE_READ, "reflog_exists"); |
e9dcc305 | 1973 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 | 1974 | struct stat st; |
e9dcc305 | 1975 | int ret; |
7bd9bcf3 | 1976 | |
802de3da | 1977 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
1978 | ret = !lstat(sb.buf, &st) && S_ISREG(st.st_mode); |
1979 | strbuf_release(&sb); | |
1980 | return ret; | |
7bd9bcf3 MH |
1981 | } |
1982 | ||
e3688bd6 DT |
1983 | static int files_delete_reflog(struct ref_store *ref_store, |
1984 | const char *refname) | |
7bd9bcf3 | 1985 | { |
802de3da | 1986 | struct files_ref_store *refs = |
9e7ec634 | 1987 | files_downcast(ref_store, REF_STORE_WRITE, "delete_reflog"); |
e9dcc305 NTND |
1988 | struct strbuf sb = STRBUF_INIT; |
1989 | int ret; | |
1990 | ||
802de3da | 1991 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
1992 | ret = remove_path(sb.buf); |
1993 | strbuf_release(&sb); | |
1994 | return ret; | |
7bd9bcf3 MH |
1995 | } |
1996 | ||
1997 | static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data) | |
1998 | { | |
9461d272 | 1999 | struct object_id ooid, noid; |
7bd9bcf3 | 2000 | char *email_end, *message; |
dddbad72 | 2001 | timestamp_t timestamp; |
7bd9bcf3 | 2002 | int tz; |
43bc3b6c | 2003 | const char *p = sb->buf; |
7bd9bcf3 MH |
2004 | |
2005 | /* old SP new SP name <email> SP time TAB msg LF */ | |
43bc3b6c | 2006 | if (!sb->len || sb->buf[sb->len - 1] != '\n' || |
2007 | parse_oid_hex(p, &ooid, &p) || *p++ != ' ' || | |
2008 | parse_oid_hex(p, &noid, &p) || *p++ != ' ' || | |
2009 | !(email_end = strchr(p, '>')) || | |
7bd9bcf3 | 2010 | email_end[1] != ' ' || |
1aeb7e75 | 2011 | !(timestamp = parse_timestamp(email_end + 2, &message, 10)) || |
7bd9bcf3 MH |
2012 | !message || message[0] != ' ' || |
2013 | (message[1] != '+' && message[1] != '-') || | |
2014 | !isdigit(message[2]) || !isdigit(message[3]) || | |
2015 | !isdigit(message[4]) || !isdigit(message[5])) | |
2016 | return 0; /* corrupt? */ | |
2017 | email_end[1] = '\0'; | |
2018 | tz = strtol(message + 1, NULL, 10); | |
2019 | if (message[6] != '\t') | |
2020 | message += 6; | |
2021 | else | |
2022 | message += 7; | |
43bc3b6c | 2023 | return fn(&ooid, &noid, p, timestamp, tz, message, cb_data); |
7bd9bcf3 MH |
2024 | } |
2025 | ||
2026 | static char *find_beginning_of_line(char *bob, char *scan) | |
2027 | { | |
2028 | while (bob < scan && *(--scan) != '\n') | |
2029 | ; /* keep scanning backwards */ | |
2030 | /* | |
2031 | * Return either beginning of the buffer, or LF at the end of | |
2032 | * the previous line. | |
2033 | */ | |
2034 | return scan; | |
2035 | } | |
2036 | ||
e3688bd6 DT |
2037 | static int files_for_each_reflog_ent_reverse(struct ref_store *ref_store, |
2038 | const char *refname, | |
2039 | each_reflog_ent_fn fn, | |
2040 | void *cb_data) | |
7bd9bcf3 | 2041 | { |
802de3da | 2042 | struct files_ref_store *refs = |
9e7ec634 NTND |
2043 | files_downcast(ref_store, REF_STORE_READ, |
2044 | "for_each_reflog_ent_reverse"); | |
7bd9bcf3 MH |
2045 | struct strbuf sb = STRBUF_INIT; |
2046 | FILE *logfp; | |
2047 | long pos; | |
2048 | int ret = 0, at_tail = 1; | |
2049 | ||
802de3da | 2050 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
2051 | logfp = fopen(sb.buf, "r"); |
2052 | strbuf_release(&sb); | |
7bd9bcf3 MH |
2053 | if (!logfp) |
2054 | return -1; | |
2055 | ||
2056 | /* Jump to the end */ | |
2057 | if (fseek(logfp, 0, SEEK_END) < 0) | |
be686f03 RS |
2058 | ret = error("cannot seek back reflog for %s: %s", |
2059 | refname, strerror(errno)); | |
7bd9bcf3 MH |
2060 | pos = ftell(logfp); |
2061 | while (!ret && 0 < pos) { | |
2062 | int cnt; | |
2063 | size_t nread; | |
2064 | char buf[BUFSIZ]; | |
2065 | char *endp, *scanp; | |
2066 | ||
2067 | /* Fill next block from the end */ | |
2068 | cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos; | |
be686f03 RS |
2069 | if (fseek(logfp, pos - cnt, SEEK_SET)) { |
2070 | ret = error("cannot seek back reflog for %s: %s", | |
2071 | refname, strerror(errno)); | |
2072 | break; | |
2073 | } | |
7bd9bcf3 | 2074 | nread = fread(buf, cnt, 1, logfp); |
be686f03 RS |
2075 | if (nread != 1) { |
2076 | ret = error("cannot read %d bytes from reflog for %s: %s", | |
2077 | cnt, refname, strerror(errno)); | |
2078 | break; | |
2079 | } | |
7bd9bcf3 MH |
2080 | pos -= cnt; |
2081 | ||
2082 | scanp = endp = buf + cnt; | |
2083 | if (at_tail && scanp[-1] == '\n') | |
2084 | /* Looking at the final LF at the end of the file */ | |
2085 | scanp--; | |
2086 | at_tail = 0; | |
2087 | ||
2088 | while (buf < scanp) { | |
2089 | /* | |
2090 | * terminating LF of the previous line, or the beginning | |
2091 | * of the buffer. | |
2092 | */ | |
2093 | char *bp; | |
2094 | ||
2095 | bp = find_beginning_of_line(buf, scanp); | |
2096 | ||
2097 | if (*bp == '\n') { | |
2098 | /* | |
2099 | * The newline is the end of the previous line, | |
2100 | * so we know we have complete line starting | |
2101 | * at (bp + 1). Prefix it onto any prior data | |
2102 | * we collected for the line and process it. | |
2103 | */ | |
2104 | strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1)); | |
2105 | scanp = bp; | |
2106 | endp = bp + 1; | |
2107 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
2108 | strbuf_reset(&sb); | |
2109 | if (ret) | |
2110 | break; | |
2111 | } else if (!pos) { | |
2112 | /* | |
2113 | * We are at the start of the buffer, and the | |
2114 | * start of the file; there is no previous | |
2115 | * line, and we have everything for this one. | |
2116 | * Process it, and we can end the loop. | |
2117 | */ | |
2118 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
2119 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
2120 | strbuf_reset(&sb); | |
2121 | break; | |
2122 | } | |
2123 | ||
2124 | if (bp == buf) { | |
2125 | /* | |
2126 | * We are at the start of the buffer, and there | |
2127 | * is more file to read backwards. Which means | |
2128 | * we are in the middle of a line. Note that we | |
2129 | * may get here even if *bp was a newline; that | |
2130 | * just means we are at the exact end of the | |
2131 | * previous line, rather than some spot in the | |
2132 | * middle. | |
2133 | * | |
2134 | * Save away what we have to be combined with | |
2135 | * the data from the next read. | |
2136 | */ | |
2137 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
2138 | break; | |
2139 | } | |
2140 | } | |
2141 | ||
2142 | } | |
2143 | if (!ret && sb.len) | |
033abf97 | 2144 | BUG("reverse reflog parser had leftover data"); |
7bd9bcf3 MH |
2145 | |
2146 | fclose(logfp); | |
2147 | strbuf_release(&sb); | |
2148 | return ret; | |
2149 | } | |
2150 | ||
e3688bd6 DT |
2151 | static int files_for_each_reflog_ent(struct ref_store *ref_store, |
2152 | const char *refname, | |
2153 | each_reflog_ent_fn fn, void *cb_data) | |
7bd9bcf3 | 2154 | { |
802de3da | 2155 | struct files_ref_store *refs = |
9e7ec634 NTND |
2156 | files_downcast(ref_store, REF_STORE_READ, |
2157 | "for_each_reflog_ent"); | |
7bd9bcf3 MH |
2158 | FILE *logfp; |
2159 | struct strbuf sb = STRBUF_INIT; | |
2160 | int ret = 0; | |
2161 | ||
802de3da | 2162 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
2163 | logfp = fopen(sb.buf, "r"); |
2164 | strbuf_release(&sb); | |
7bd9bcf3 MH |
2165 | if (!logfp) |
2166 | return -1; | |
2167 | ||
2168 | while (!ret && !strbuf_getwholeline(&sb, logfp, '\n')) | |
2169 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
2170 | fclose(logfp); | |
2171 | strbuf_release(&sb); | |
2172 | return ret; | |
2173 | } | |
7bd9bcf3 | 2174 | |
2880d16f MH |
2175 | struct files_reflog_iterator { |
2176 | struct ref_iterator base; | |
2f40e954 | 2177 | struct ref_store *ref_store; |
2880d16f | 2178 | struct dir_iterator *dir_iterator; |
2880d16f | 2179 | }; |
7bd9bcf3 | 2180 | |
2880d16f MH |
2181 | static int files_reflog_iterator_advance(struct ref_iterator *ref_iterator) |
2182 | { | |
2183 | struct files_reflog_iterator *iter = | |
2184 | (struct files_reflog_iterator *)ref_iterator; | |
2185 | struct dir_iterator *diter = iter->dir_iterator; | |
2186 | int ok; | |
2187 | ||
2188 | while ((ok = dir_iterator_advance(diter)) == ITER_OK) { | |
2880d16f | 2189 | if (!S_ISREG(diter->st.st_mode)) |
7bd9bcf3 | 2190 | continue; |
59c50a96 PS |
2191 | if (check_refname_format(diter->basename, |
2192 | REFNAME_ALLOW_ONELEVEL)) | |
2880d16f | 2193 | continue; |
2880d16f MH |
2194 | |
2195 | iter->base.refname = diter->relative_path; | |
2880d16f | 2196 | return ITER_OK; |
7bd9bcf3 | 2197 | } |
2880d16f MH |
2198 | |
2199 | iter->dir_iterator = NULL; | |
2200 | if (ref_iterator_abort(ref_iterator) == ITER_ERROR) | |
2201 | ok = ITER_ERROR; | |
2202 | return ok; | |
2203 | } | |
2204 | ||
5cf88fd8 ÆAB |
2205 | static int files_reflog_iterator_peel(struct ref_iterator *ref_iterator UNUSED, |
2206 | struct object_id *peeled UNUSED) | |
2880d16f | 2207 | { |
033abf97 | 2208 | BUG("ref_iterator_peel() called for reflog_iterator"); |
2880d16f MH |
2209 | } |
2210 | ||
2211 | static int files_reflog_iterator_abort(struct ref_iterator *ref_iterator) | |
2212 | { | |
2213 | struct files_reflog_iterator *iter = | |
2214 | (struct files_reflog_iterator *)ref_iterator; | |
2215 | int ok = ITER_DONE; | |
2216 | ||
2217 | if (iter->dir_iterator) | |
2218 | ok = dir_iterator_abort(iter->dir_iterator); | |
2219 | ||
2220 | base_ref_iterator_free(ref_iterator); | |
2221 | return ok; | |
2222 | } | |
2223 | ||
2224 | static struct ref_iterator_vtable files_reflog_iterator_vtable = { | |
e2f8acb6 ÆAB |
2225 | .advance = files_reflog_iterator_advance, |
2226 | .peel = files_reflog_iterator_peel, | |
2227 | .abort = files_reflog_iterator_abort, | |
2880d16f MH |
2228 | }; |
2229 | ||
944b4e30 NTND |
2230 | static struct ref_iterator *reflog_iterator_begin(struct ref_store *ref_store, |
2231 | const char *gitdir) | |
2880d16f | 2232 | { |
3012397e MT |
2233 | struct dir_iterator *diter; |
2234 | struct files_reflog_iterator *iter; | |
2235 | struct ref_iterator *ref_iterator; | |
e9dcc305 | 2236 | struct strbuf sb = STRBUF_INIT; |
2880d16f | 2237 | |
944b4e30 | 2238 | strbuf_addf(&sb, "%s/logs", gitdir); |
3012397e | 2239 | |
e69e8ffe | 2240 | diter = dir_iterator_begin(sb.buf, DIR_ITERATOR_SORTED); |
9b7b0295 RS |
2241 | if (!diter) { |
2242 | strbuf_release(&sb); | |
3012397e | 2243 | return empty_ref_iterator_begin(); |
9b7b0295 | 2244 | } |
3012397e | 2245 | |
ca56dadb | 2246 | CALLOC_ARRAY(iter, 1); |
3012397e MT |
2247 | ref_iterator = &iter->base; |
2248 | ||
5e01d838 | 2249 | base_ref_iterator_init(ref_iterator, &files_reflog_iterator_vtable); |
3012397e | 2250 | iter->dir_iterator = diter; |
2f40e954 | 2251 | iter->ref_store = ref_store; |
e9dcc305 | 2252 | strbuf_release(&sb); |
944b4e30 | 2253 | |
2880d16f | 2254 | return ref_iterator; |
7bd9bcf3 MH |
2255 | } |
2256 | ||
944b4e30 NTND |
2257 | static struct ref_iterator *files_reflog_iterator_begin(struct ref_store *ref_store) |
2258 | { | |
2259 | struct files_ref_store *refs = | |
2260 | files_downcast(ref_store, REF_STORE_READ, | |
2261 | "reflog_iterator_begin"); | |
2262 | ||
5085aef4 | 2263 | if (!strcmp(refs->base.gitdir, refs->gitcommondir)) { |
944b4e30 NTND |
2264 | return reflog_iterator_begin(ref_store, refs->gitcommondir); |
2265 | } else { | |
2266 | return merge_ref_iterator_begin( | |
5e01d838 | 2267 | reflog_iterator_begin(ref_store, refs->base.gitdir), |
944b4e30 | 2268 | reflog_iterator_begin(ref_store, refs->gitcommondir), |
6f227800 | 2269 | ref_iterator_select, refs); |
944b4e30 NTND |
2270 | } |
2271 | } | |
2272 | ||
165056b2 | 2273 | /* |
92b1551b MH |
2274 | * If update is a direct update of head_ref (the reference pointed to |
2275 | * by HEAD), then add an extra REF_LOG_ONLY update for HEAD. | |
2276 | */ | |
2277 | static int split_head_update(struct ref_update *update, | |
2278 | struct ref_transaction *transaction, | |
2279 | const char *head_ref, | |
2280 | struct string_list *affected_refnames, | |
2281 | struct strbuf *err) | |
2282 | { | |
2283 | struct string_list_item *item; | |
2284 | struct ref_update *new_update; | |
2285 | ||
2286 | if ((update->flags & REF_LOG_ONLY) || | |
acedcde7 | 2287 | (update->flags & REF_IS_PRUNING) || |
92b1551b MH |
2288 | (update->flags & REF_UPDATE_VIA_HEAD)) |
2289 | return 0; | |
2290 | ||
2291 | if (strcmp(update->refname, head_ref)) | |
2292 | return 0; | |
2293 | ||
2294 | /* | |
2295 | * First make sure that HEAD is not already in the | |
276d0e35 | 2296 | * transaction. This check is O(lg N) in the transaction |
92b1551b MH |
2297 | * size, but it happens at most once per transaction. |
2298 | */ | |
276d0e35 | 2299 | if (string_list_has_string(affected_refnames, "HEAD")) { |
92b1551b MH |
2300 | /* An entry already existed */ |
2301 | strbuf_addf(err, | |
2302 | "multiple updates for 'HEAD' (including one " | |
2303 | "via its referent '%s') are not allowed", | |
2304 | update->refname); | |
2305 | return TRANSACTION_NAME_CONFLICT; | |
2306 | } | |
2307 | ||
2308 | new_update = ref_transaction_add_update( | |
2309 | transaction, "HEAD", | |
91774afc | 2310 | update->flags | REF_LOG_ONLY | REF_NO_DEREF, |
89f3bbdd | 2311 | &update->new_oid, &update->old_oid, |
92b1551b MH |
2312 | update->msg); |
2313 | ||
276d0e35 MÅ |
2314 | /* |
2315 | * Add "HEAD". This insertion is O(N) in the transaction | |
2316 | * size, but it happens at most once per transaction. | |
2317 | * Add new_update->refname instead of a literal "HEAD". | |
2318 | */ | |
2319 | if (strcmp(new_update->refname, "HEAD")) | |
2320 | BUG("%s unexpectedly not 'HEAD'", new_update->refname); | |
2321 | item = string_list_insert(affected_refnames, new_update->refname); | |
92b1551b MH |
2322 | item->util = new_update; |
2323 | ||
2324 | return 0; | |
2325 | } | |
2326 | ||
2327 | /* | |
2328 | * update is for a symref that points at referent and doesn't have | |
91774afc MH |
2329 | * REF_NO_DEREF set. Split it into two updates: |
2330 | * - The original update, but with REF_LOG_ONLY and REF_NO_DEREF set | |
92b1551b MH |
2331 | * - A new, separate update for the referent reference |
2332 | * Note that the new update will itself be subject to splitting when | |
2333 | * the iteration gets to it. | |
2334 | */ | |
10dee40e | 2335 | static int split_symref_update(struct ref_update *update, |
92b1551b MH |
2336 | const char *referent, |
2337 | struct ref_transaction *transaction, | |
2338 | struct string_list *affected_refnames, | |
2339 | struct strbuf *err) | |
2340 | { | |
2341 | struct string_list_item *item; | |
2342 | struct ref_update *new_update; | |
2343 | unsigned int new_flags; | |
2344 | ||
2345 | /* | |
2346 | * First make sure that referent is not already in the | |
c299468b | 2347 | * transaction. This check is O(lg N) in the transaction |
92b1551b MH |
2348 | * size, but it happens at most once per symref in a |
2349 | * transaction. | |
2350 | */ | |
c299468b MÅ |
2351 | if (string_list_has_string(affected_refnames, referent)) { |
2352 | /* An entry already exists */ | |
92b1551b MH |
2353 | strbuf_addf(err, |
2354 | "multiple updates for '%s' (including one " | |
2355 | "via symref '%s') are not allowed", | |
2356 | referent, update->refname); | |
2357 | return TRANSACTION_NAME_CONFLICT; | |
2358 | } | |
2359 | ||
2360 | new_flags = update->flags; | |
2361 | if (!strcmp(update->refname, "HEAD")) { | |
2362 | /* | |
2363 | * Record that the new update came via HEAD, so that | |
2364 | * when we process it, split_head_update() doesn't try | |
2365 | * to add another reflog update for HEAD. Note that | |
2366 | * this bit will be propagated if the new_update | |
2367 | * itself needs to be split. | |
2368 | */ | |
2369 | new_flags |= REF_UPDATE_VIA_HEAD; | |
2370 | } | |
2371 | ||
2372 | new_update = ref_transaction_add_update( | |
2373 | transaction, referent, new_flags, | |
89f3bbdd | 2374 | &update->new_oid, &update->old_oid, |
92b1551b MH |
2375 | update->msg); |
2376 | ||
6e30b2f6 MH |
2377 | new_update->parent_update = update; |
2378 | ||
2379 | /* | |
2380 | * Change the symbolic ref update to log only. Also, it | |
78fb4579 | 2381 | * doesn't need to check its old OID value, as that will be |
6e30b2f6 MH |
2382 | * done when new_update is processed. |
2383 | */ | |
91774afc | 2384 | update->flags |= REF_LOG_ONLY | REF_NO_DEREF; |
6e30b2f6 | 2385 | update->flags &= ~REF_HAVE_OLD; |
92b1551b | 2386 | |
c299468b MÅ |
2387 | /* |
2388 | * Add the referent. This insertion is O(N) in the transaction | |
2389 | * size, but it happens at most once per symref in a | |
2390 | * transaction. Make sure to add new_update->refname, which will | |
2391 | * be valid as long as affected_refnames is in use, and NOT | |
2392 | * referent, which might soon be freed by our caller. | |
2393 | */ | |
2394 | item = string_list_insert(affected_refnames, new_update->refname); | |
2395 | if (item->util) | |
2396 | BUG("%s unexpectedly found in affected_refnames", | |
2397 | new_update->refname); | |
92b1551b MH |
2398 | item->util = new_update; |
2399 | ||
2400 | return 0; | |
2401 | } | |
2402 | ||
6e30b2f6 MH |
2403 | /* |
2404 | * Return the refname under which update was originally requested. | |
2405 | */ | |
2406 | static const char *original_update_refname(struct ref_update *update) | |
2407 | { | |
2408 | while (update->parent_update) | |
2409 | update = update->parent_update; | |
2410 | ||
2411 | return update->refname; | |
2412 | } | |
2413 | ||
e3f51039 MH |
2414 | /* |
2415 | * Check whether the REF_HAVE_OLD and old_oid values stored in update | |
2416 | * are consistent with oid, which is the reference's current value. If | |
2417 | * everything is OK, return 0; otherwise, write an error message to | |
2418 | * err and return -1. | |
2419 | */ | |
2420 | static int check_old_oid(struct ref_update *update, struct object_id *oid, | |
2421 | struct strbuf *err) | |
2422 | { | |
2423 | if (!(update->flags & REF_HAVE_OLD) || | |
4a7e27e9 | 2424 | oideq(oid, &update->old_oid)) |
e3f51039 MH |
2425 | return 0; |
2426 | ||
98491298 | 2427 | if (is_null_oid(&update->old_oid)) |
e3f51039 MH |
2428 | strbuf_addf(err, "cannot lock ref '%s': " |
2429 | "reference already exists", | |
2430 | original_update_refname(update)); | |
2431 | else if (is_null_oid(oid)) | |
2432 | strbuf_addf(err, "cannot lock ref '%s': " | |
2433 | "reference is missing but expected %s", | |
2434 | original_update_refname(update), | |
98491298 | 2435 | oid_to_hex(&update->old_oid)); |
e3f51039 MH |
2436 | else |
2437 | strbuf_addf(err, "cannot lock ref '%s': " | |
2438 | "is at %s but expected %s", | |
2439 | original_update_refname(update), | |
2440 | oid_to_hex(oid), | |
98491298 | 2441 | oid_to_hex(&update->old_oid)); |
e3f51039 MH |
2442 | |
2443 | return -1; | |
2444 | } | |
2445 | ||
92b1551b MH |
2446 | /* |
2447 | * Prepare for carrying out update: | |
2448 | * - Lock the reference referred to by update. | |
2449 | * - Read the reference under lock. | |
78fb4579 | 2450 | * - Check that its old OID value (if specified) is correct, and in |
92b1551b MH |
2451 | * any case record it in update->lock->old_oid for later use when |
2452 | * writing the reflog. | |
91774afc | 2453 | * - If it is a symref update without REF_NO_DEREF, split it up into a |
92b1551b MH |
2454 | * REF_LOG_ONLY update of the symref and add a separate update for |
2455 | * the referent to transaction. | |
2456 | * - If it is an update of head_ref, add a corresponding REF_LOG_ONLY | |
2457 | * update of HEAD. | |
165056b2 | 2458 | */ |
b3bbbc5c MH |
2459 | static int lock_ref_for_update(struct files_ref_store *refs, |
2460 | struct ref_update *update, | |
165056b2 | 2461 | struct ref_transaction *transaction, |
92b1551b | 2462 | const char *head_ref, |
165056b2 MH |
2463 | struct string_list *affected_refnames, |
2464 | struct strbuf *err) | |
2465 | { | |
92b1551b MH |
2466 | struct strbuf referent = STRBUF_INIT; |
2467 | int mustexist = (update->flags & REF_HAVE_OLD) && | |
98491298 | 2468 | !is_null_oid(&update->old_oid); |
851e1fbd | 2469 | int ret = 0; |
92b1551b | 2470 | struct ref_lock *lock; |
165056b2 | 2471 | |
32c597e7 | 2472 | files_assert_main_repository(refs, "lock_ref_for_update"); |
b3bbbc5c | 2473 | |
98491298 | 2474 | if ((update->flags & REF_HAVE_NEW) && is_null_oid(&update->new_oid)) |
165056b2 | 2475 | update->flags |= REF_DELETING; |
92b1551b MH |
2476 | |
2477 | if (head_ref) { | |
2478 | ret = split_head_update(update, transaction, head_ref, | |
2479 | affected_refnames, err); | |
2480 | if (ret) | |
851e1fbd | 2481 | goto out; |
92b1551b MH |
2482 | } |
2483 | ||
f7b0a987 | 2484 | ret = lock_raw_ref(refs, update->refname, mustexist, |
640d9d55 | 2485 | affected_refnames, |
7d618264 | 2486 | &lock, &referent, |
92b1551b | 2487 | &update->type, err); |
92b1551b | 2488 | if (ret) { |
165056b2 MH |
2489 | char *reason; |
2490 | ||
165056b2 MH |
2491 | reason = strbuf_detach(err, NULL); |
2492 | strbuf_addf(err, "cannot lock ref '%s': %s", | |
e3f51039 | 2493 | original_update_refname(update), reason); |
165056b2 | 2494 | free(reason); |
851e1fbd | 2495 | goto out; |
165056b2 | 2496 | } |
92b1551b | 2497 | |
7d618264 | 2498 | update->backend_data = lock; |
92b1551b | 2499 | |
8169d0d0 | 2500 | if (update->type & REF_ISSYMREF) { |
91774afc | 2501 | if (update->flags & REF_NO_DEREF) { |
6e30b2f6 MH |
2502 | /* |
2503 | * We won't be reading the referent as part of | |
2504 | * the transaction, so we have to read it here | |
78fb4579 | 2505 | * to record and possibly check old_oid: |
6e30b2f6 | 2506 | */ |
f1da24ca | 2507 | if (!refs_resolve_ref_unsafe(&refs->base, |
76887df0 | 2508 | referent.buf, 0, |
ce14de03 | 2509 | &lock->old_oid, NULL)) { |
6e30b2f6 MH |
2510 | if (update->flags & REF_HAVE_OLD) { |
2511 | strbuf_addf(err, "cannot lock ref '%s': " | |
e3f51039 MH |
2512 | "error reading reference", |
2513 | original_update_refname(update)); | |
3f5ef95b | 2514 | ret = TRANSACTION_GENERIC_ERROR; |
851e1fbd | 2515 | goto out; |
6e30b2f6 | 2516 | } |
e3f51039 | 2517 | } else if (check_old_oid(update, &lock->old_oid, err)) { |
851e1fbd MÅ |
2518 | ret = TRANSACTION_GENERIC_ERROR; |
2519 | goto out; | |
8169d0d0 | 2520 | } |
6e30b2f6 MH |
2521 | } else { |
2522 | /* | |
2523 | * Create a new update for the reference this | |
2524 | * symref is pointing at. Also, we will record | |
78fb4579 | 2525 | * and verify old_oid for this update as part |
6e30b2f6 MH |
2526 | * of processing the split-off update, so we |
2527 | * don't have to do it here. | |
2528 | */ | |
10dee40e | 2529 | ret = split_symref_update(update, |
fcc42ea0 | 2530 | referent.buf, transaction, |
92b1551b MH |
2531 | affected_refnames, err); |
2532 | if (ret) | |
851e1fbd | 2533 | goto out; |
92b1551b | 2534 | } |
6e30b2f6 MH |
2535 | } else { |
2536 | struct ref_update *parent_update; | |
8169d0d0 | 2537 | |
851e1fbd MÅ |
2538 | if (check_old_oid(update, &lock->old_oid, err)) { |
2539 | ret = TRANSACTION_GENERIC_ERROR; | |
2540 | goto out; | |
2541 | } | |
e3f51039 | 2542 | |
6e30b2f6 MH |
2543 | /* |
2544 | * If this update is happening indirectly because of a | |
78fb4579 | 2545 | * symref update, record the old OID in the parent |
6e30b2f6 MH |
2546 | * update: |
2547 | */ | |
2548 | for (parent_update = update->parent_update; | |
2549 | parent_update; | |
2550 | parent_update = parent_update->parent_update) { | |
7d618264 DT |
2551 | struct ref_lock *parent_lock = parent_update->backend_data; |
2552 | oidcpy(&parent_lock->old_oid, &lock->old_oid); | |
6e30b2f6 | 2553 | } |
92b1551b MH |
2554 | } |
2555 | ||
165056b2 MH |
2556 | if ((update->flags & REF_HAVE_NEW) && |
2557 | !(update->flags & REF_DELETING) && | |
2558 | !(update->flags & REF_LOG_ONLY)) { | |
92b1551b | 2559 | if (!(update->type & REF_ISSYMREF) && |
4a7e27e9 | 2560 | oideq(&lock->old_oid, &update->new_oid)) { |
165056b2 MH |
2561 | /* |
2562 | * The reference already has the desired | |
2563 | * value, so we don't need to write it. | |
2564 | */ | |
e9706a18 HWN |
2565 | } else if (write_ref_to_lockfile( |
2566 | lock, &update->new_oid, | |
2567 | update->flags & REF_SKIP_OID_VERIFICATION, | |
2568 | err)) { | |
165056b2 MH |
2569 | char *write_err = strbuf_detach(err, NULL); |
2570 | ||
2571 | /* | |
2572 | * The lock was freed upon failure of | |
2573 | * write_ref_to_lockfile(): | |
2574 | */ | |
7d618264 | 2575 | update->backend_data = NULL; |
165056b2 | 2576 | strbuf_addf(err, |
e3f51039 | 2577 | "cannot update ref '%s': %s", |
165056b2 MH |
2578 | update->refname, write_err); |
2579 | free(write_err); | |
851e1fbd MÅ |
2580 | ret = TRANSACTION_GENERIC_ERROR; |
2581 | goto out; | |
165056b2 MH |
2582 | } else { |
2583 | update->flags |= REF_NEEDS_COMMIT; | |
2584 | } | |
2585 | } | |
2586 | if (!(update->flags & REF_NEEDS_COMMIT)) { | |
2587 | /* | |
2588 | * We didn't call write_ref_to_lockfile(), so | |
2589 | * the lockfile is still open. Close it to | |
2590 | * free up the file descriptor: | |
2591 | */ | |
83a3069a | 2592 | if (close_ref_gently(lock)) { |
165056b2 MH |
2593 | strbuf_addf(err, "couldn't close '%s.lock'", |
2594 | update->refname); | |
851e1fbd MÅ |
2595 | ret = TRANSACTION_GENERIC_ERROR; |
2596 | goto out; | |
165056b2 MH |
2597 | } |
2598 | } | |
851e1fbd MÅ |
2599 | |
2600 | out: | |
2601 | strbuf_release(&referent); | |
2602 | return ret; | |
165056b2 MH |
2603 | } |
2604 | ||
dc39e099 MH |
2605 | struct files_transaction_backend_data { |
2606 | struct ref_transaction *packed_transaction; | |
2607 | int packed_refs_locked; | |
2608 | }; | |
2609 | ||
c0ca9357 MH |
2610 | /* |
2611 | * Unlock any references in `transaction` that are still locked, and | |
2612 | * mark the transaction closed. | |
2613 | */ | |
dc39e099 MH |
2614 | static void files_transaction_cleanup(struct files_ref_store *refs, |
2615 | struct ref_transaction *transaction) | |
c0ca9357 MH |
2616 | { |
2617 | size_t i; | |
dc39e099 MH |
2618 | struct files_transaction_backend_data *backend_data = |
2619 | transaction->backend_data; | |
2620 | struct strbuf err = STRBUF_INIT; | |
c0ca9357 MH |
2621 | |
2622 | for (i = 0; i < transaction->nr; i++) { | |
2623 | struct ref_update *update = transaction->updates[i]; | |
2624 | struct ref_lock *lock = update->backend_data; | |
2625 | ||
2626 | if (lock) { | |
2627 | unlock_ref(lock); | |
2628 | update->backend_data = NULL; | |
2629 | } | |
2630 | } | |
2631 | ||
edc30691 PS |
2632 | if (backend_data) { |
2633 | if (backend_data->packed_transaction && | |
2634 | ref_transaction_abort(backend_data->packed_transaction, &err)) { | |
2635 | error("error aborting transaction: %s", err.buf); | |
2636 | strbuf_release(&err); | |
2637 | } | |
dc39e099 | 2638 | |
edc30691 PS |
2639 | if (backend_data->packed_refs_locked) |
2640 | packed_refs_unlock(refs->packed_ref_store); | |
dc39e099 | 2641 | |
edc30691 PS |
2642 | free(backend_data); |
2643 | } | |
dc39e099 | 2644 | |
c0ca9357 MH |
2645 | transaction->state = REF_TRANSACTION_CLOSED; |
2646 | } | |
2647 | ||
30173b88 MH |
2648 | static int files_transaction_prepare(struct ref_store *ref_store, |
2649 | struct ref_transaction *transaction, | |
2650 | struct strbuf *err) | |
7bd9bcf3 | 2651 | { |
00eebe35 | 2652 | struct files_ref_store *refs = |
9e7ec634 | 2653 | files_downcast(ref_store, REF_STORE_WRITE, |
30173b88 | 2654 | "ref_transaction_prepare"); |
43a2dfde MH |
2655 | size_t i; |
2656 | int ret = 0; | |
7bd9bcf3 | 2657 | struct string_list affected_refnames = STRING_LIST_INIT_NODUP; |
92b1551b MH |
2658 | char *head_ref = NULL; |
2659 | int head_type; | |
dc39e099 MH |
2660 | struct files_transaction_backend_data *backend_data; |
2661 | struct ref_transaction *packed_transaction = NULL; | |
7bd9bcf3 MH |
2662 | |
2663 | assert(err); | |
2664 | ||
c0ca9357 MH |
2665 | if (!transaction->nr) |
2666 | goto cleanup; | |
7bd9bcf3 | 2667 | |
ca56dadb | 2668 | CALLOC_ARRAY(backend_data, 1); |
dc39e099 MH |
2669 | transaction->backend_data = backend_data; |
2670 | ||
92b1551b MH |
2671 | /* |
2672 | * Fail if a refname appears more than once in the | |
2673 | * transaction. (If we end up splitting up any updates using | |
2674 | * split_symref_update() or split_head_update(), those | |
2675 | * functions will check that the new updates don't have the | |
62c72d1f | 2676 | * same refname as any existing ones.) Also fail if any of the |
acedcde7 | 2677 | * updates use REF_IS_PRUNING without REF_NO_DEREF. |
92b1551b MH |
2678 | */ |
2679 | for (i = 0; i < transaction->nr; i++) { | |
2680 | struct ref_update *update = transaction->updates[i]; | |
2681 | struct string_list_item *item = | |
2682 | string_list_append(&affected_refnames, update->refname); | |
2683 | ||
acedcde7 | 2684 | if ((update->flags & REF_IS_PRUNING) && |
91774afc | 2685 | !(update->flags & REF_NO_DEREF)) |
acedcde7 | 2686 | BUG("REF_IS_PRUNING set without REF_NO_DEREF"); |
62c72d1f | 2687 | |
92b1551b MH |
2688 | /* |
2689 | * We store a pointer to update in item->util, but at | |
2690 | * the moment we never use the value of this field | |
2691 | * except to check whether it is non-NULL. | |
2692 | */ | |
2693 | item->util = update; | |
2694 | } | |
7bd9bcf3 MH |
2695 | string_list_sort(&affected_refnames); |
2696 | if (ref_update_reject_duplicates(&affected_refnames, err)) { | |
2697 | ret = TRANSACTION_GENERIC_ERROR; | |
2698 | goto cleanup; | |
2699 | } | |
2700 | ||
92b1551b MH |
2701 | /* |
2702 | * Special hack: If a branch is updated directly and HEAD | |
2703 | * points to it (may happen on the remote side of a push | |
2704 | * for example) then logically the HEAD reflog should be | |
2705 | * updated too. | |
2706 | * | |
2707 | * A generic solution would require reverse symref lookups, | |
2708 | * but finding all symrefs pointing to a given branch would be | |
2709 | * rather costly for this rare event (the direct update of a | |
2710 | * branch) to be worth it. So let's cheat and check with HEAD | |
2711 | * only, which should cover 99% of all usage scenarios (even | |
2712 | * 100% of the default ones). | |
2713 | * | |
2714 | * So if HEAD is a symbolic reference, then record the name of | |
2715 | * the reference that it points to. If we see an update of | |
2716 | * head_ref within the transaction, then split_head_update() | |
2717 | * arranges for the reflog of HEAD to be updated, too. | |
2718 | */ | |
2f40e954 NTND |
2719 | head_ref = refs_resolve_refdup(ref_store, "HEAD", |
2720 | RESOLVE_REF_NO_RECURSE, | |
872ccb2c | 2721 | NULL, &head_type); |
92b1551b MH |
2722 | |
2723 | if (head_ref && !(head_type & REF_ISSYMREF)) { | |
6a83d902 | 2724 | FREE_AND_NULL(head_ref); |
92b1551b MH |
2725 | } |
2726 | ||
7bd9bcf3 MH |
2727 | /* |
2728 | * Acquire all locks, verify old values if provided, check | |
2729 | * that new values are valid, and write new values to the | |
2730 | * lockfiles, ready to be activated. Only keep one lockfile | |
2731 | * open at a time to avoid running out of file descriptors. | |
30173b88 MH |
2732 | * Note that lock_ref_for_update() might append more updates |
2733 | * to the transaction. | |
7bd9bcf3 | 2734 | */ |
efe47281 MH |
2735 | for (i = 0; i < transaction->nr; i++) { |
2736 | struct ref_update *update = transaction->updates[i]; | |
7bd9bcf3 | 2737 | |
b3bbbc5c MH |
2738 | ret = lock_ref_for_update(refs, update, transaction, |
2739 | head_ref, &affected_refnames, err); | |
165056b2 | 2740 | if (ret) |
da5267f1 | 2741 | goto cleanup; |
dc39e099 MH |
2742 | |
2743 | if (update->flags & REF_DELETING && | |
2744 | !(update->flags & REF_LOG_ONLY) && | |
acedcde7 | 2745 | !(update->flags & REF_IS_PRUNING)) { |
dc39e099 MH |
2746 | /* |
2747 | * This reference has to be deleted from | |
2748 | * packed-refs if it exists there. | |
2749 | */ | |
2750 | if (!packed_transaction) { | |
2751 | packed_transaction = ref_store_transaction_begin( | |
c6da34a6 | 2752 | refs->packed_ref_store, err); |
dc39e099 MH |
2753 | if (!packed_transaction) { |
2754 | ret = TRANSACTION_GENERIC_ERROR; | |
2755 | goto cleanup; | |
2756 | } | |
2757 | ||
2758 | backend_data->packed_transaction = | |
2759 | packed_transaction; | |
2760 | } | |
2761 | ||
2762 | ref_transaction_add_update( | |
2763 | packed_transaction, update->refname, | |
91774afc | 2764 | REF_HAVE_NEW | REF_NO_DEREF, |
b0ca4110 | 2765 | &update->new_oid, NULL, |
dc39e099 MH |
2766 | NULL); |
2767 | } | |
2768 | } | |
2769 | ||
2770 | if (packed_transaction) { | |
2771 | if (packed_refs_lock(refs->packed_ref_store, 0, err)) { | |
2772 | ret = TRANSACTION_GENERIC_ERROR; | |
2773 | goto cleanup; | |
2774 | } | |
2775 | backend_data->packed_refs_locked = 1; | |
7c6bd25c MH |
2776 | |
2777 | if (is_packed_transaction_needed(refs->packed_ref_store, | |
2778 | packed_transaction)) { | |
2779 | ret = ref_transaction_prepare(packed_transaction, err); | |
249e8dc7 JK |
2780 | /* |
2781 | * A failure during the prepare step will abort | |
2782 | * itself, but not free. Do that now, and disconnect | |
2783 | * from the files_transaction so it does not try to | |
2784 | * abort us when we hit the cleanup code below. | |
2785 | */ | |
2786 | if (ret) { | |
2787 | ref_transaction_free(packed_transaction); | |
2788 | backend_data->packed_transaction = NULL; | |
2789 | } | |
7c6bd25c MH |
2790 | } else { |
2791 | /* | |
2792 | * We can skip rewriting the `packed-refs` | |
2793 | * file. But we do need to leave it locked, so | |
2794 | * that somebody else doesn't pack a reference | |
2795 | * that we are trying to delete. | |
d3322eb2 JK |
2796 | * |
2797 | * We need to disconnect our transaction from | |
2798 | * backend_data, since the abort (whether successful or | |
2799 | * not) will free it. | |
7c6bd25c | 2800 | */ |
d3322eb2 | 2801 | backend_data->packed_transaction = NULL; |
7c6bd25c MH |
2802 | if (ref_transaction_abort(packed_transaction, err)) { |
2803 | ret = TRANSACTION_GENERIC_ERROR; | |
2804 | goto cleanup; | |
2805 | } | |
7c6bd25c | 2806 | } |
30173b88 MH |
2807 | } |
2808 | ||
2809 | cleanup: | |
2810 | free(head_ref); | |
2811 | string_list_clear(&affected_refnames, 0); | |
2812 | ||
2813 | if (ret) | |
dc39e099 | 2814 | files_transaction_cleanup(refs, transaction); |
30173b88 MH |
2815 | else |
2816 | transaction->state = REF_TRANSACTION_PREPARED; | |
2817 | ||
2818 | return ret; | |
2819 | } | |
2820 | ||
2821 | static int files_transaction_finish(struct ref_store *ref_store, | |
2822 | struct ref_transaction *transaction, | |
2823 | struct strbuf *err) | |
2824 | { | |
2825 | struct files_ref_store *refs = | |
2826 | files_downcast(ref_store, 0, "ref_transaction_finish"); | |
2827 | size_t i; | |
2828 | int ret = 0; | |
30173b88 | 2829 | struct strbuf sb = STRBUF_INIT; |
dc39e099 MH |
2830 | struct files_transaction_backend_data *backend_data; |
2831 | struct ref_transaction *packed_transaction; | |
2832 | ||
30173b88 MH |
2833 | |
2834 | assert(err); | |
2835 | ||
2836 | if (!transaction->nr) { | |
2837 | transaction->state = REF_TRANSACTION_CLOSED; | |
2838 | return 0; | |
7bd9bcf3 | 2839 | } |
7bd9bcf3 | 2840 | |
dc39e099 MH |
2841 | backend_data = transaction->backend_data; |
2842 | packed_transaction = backend_data->packed_transaction; | |
2843 | ||
7bd9bcf3 | 2844 | /* Perform updates first so live commits remain referenced */ |
efe47281 MH |
2845 | for (i = 0; i < transaction->nr; i++) { |
2846 | struct ref_update *update = transaction->updates[i]; | |
7d618264 | 2847 | struct ref_lock *lock = update->backend_data; |
7bd9bcf3 | 2848 | |
d99aa884 DT |
2849 | if (update->flags & REF_NEEDS_COMMIT || |
2850 | update->flags & REF_LOG_ONLY) { | |
802de3da NTND |
2851 | if (files_log_ref_write(refs, |
2852 | lock->ref_name, | |
4417df8c | 2853 | &lock->old_oid, |
2854 | &update->new_oid, | |
81b1b6d4 MH |
2855 | update->msg, update->flags, |
2856 | err)) { | |
92b1551b MH |
2857 | char *old_msg = strbuf_detach(err, NULL); |
2858 | ||
2859 | strbuf_addf(err, "cannot update the ref '%s': %s", | |
2860 | lock->ref_name, old_msg); | |
2861 | free(old_msg); | |
2862 | unlock_ref(lock); | |
7d618264 | 2863 | update->backend_data = NULL; |
7bd9bcf3 MH |
2864 | ret = TRANSACTION_GENERIC_ERROR; |
2865 | goto cleanup; | |
7bd9bcf3 MH |
2866 | } |
2867 | } | |
7bd9bcf3 | 2868 | if (update->flags & REF_NEEDS_COMMIT) { |
00eebe35 | 2869 | clear_loose_ref_cache(refs); |
92b1551b MH |
2870 | if (commit_ref(lock)) { |
2871 | strbuf_addf(err, "couldn't set '%s'", lock->ref_name); | |
2872 | unlock_ref(lock); | |
7d618264 | 2873 | update->backend_data = NULL; |
7bd9bcf3 MH |
2874 | ret = TRANSACTION_GENERIC_ERROR; |
2875 | goto cleanup; | |
7bd9bcf3 MH |
2876 | } |
2877 | } | |
2878 | } | |
dc39e099 | 2879 | |
5e00a6c8 MH |
2880 | /* |
2881 | * Now that updates are safely completed, we can perform | |
2882 | * deletes. First delete the reflogs of any references that | |
2883 | * will be deleted, since (in the unexpected event of an | |
2884 | * error) leaving a reference without a reflog is less bad | |
2885 | * than leaving a reflog without a reference (the latter is a | |
2886 | * mildly invalid repository state): | |
2887 | */ | |
2888 | for (i = 0; i < transaction->nr; i++) { | |
2889 | struct ref_update *update = transaction->updates[i]; | |
2890 | if (update->flags & REF_DELETING && | |
2891 | !(update->flags & REF_LOG_ONLY) && | |
acedcde7 | 2892 | !(update->flags & REF_IS_PRUNING)) { |
5e00a6c8 MH |
2893 | strbuf_reset(&sb); |
2894 | files_reflog_path(refs, &sb, update->refname); | |
2895 | if (!unlink_or_warn(sb.buf)) | |
2896 | try_remove_empty_parents(refs, update->refname, | |
2897 | REMOVE_EMPTY_PARENTS_REFLOG); | |
2898 | } | |
2899 | } | |
2900 | ||
dc39e099 MH |
2901 | /* |
2902 | * Perform deletes now that updates are safely completed. | |
2903 | * | |
2904 | * First delete any packed versions of the references, while | |
2905 | * retaining the packed-refs lock: | |
2906 | */ | |
2907 | if (packed_transaction) { | |
2908 | ret = ref_transaction_commit(packed_transaction, err); | |
2909 | ref_transaction_free(packed_transaction); | |
2910 | packed_transaction = NULL; | |
2911 | backend_data->packed_transaction = NULL; | |
2912 | if (ret) | |
2913 | goto cleanup; | |
2914 | } | |
2915 | ||
2916 | /* Now delete the loose versions of the references: */ | |
efe47281 MH |
2917 | for (i = 0; i < transaction->nr; i++) { |
2918 | struct ref_update *update = transaction->updates[i]; | |
7d618264 | 2919 | struct ref_lock *lock = update->backend_data; |
7bd9bcf3 | 2920 | |
d99aa884 DT |
2921 | if (update->flags & REF_DELETING && |
2922 | !(update->flags & REF_LOG_ONLY)) { | |
5f03e512 | 2923 | update->flags |= REF_DELETED_RMDIR; |
ce0af24d MH |
2924 | if (!(update->type & REF_ISPACKED) || |
2925 | update->type & REF_ISSYMREF) { | |
2926 | /* It is a loose reference. */ | |
e9dcc305 | 2927 | strbuf_reset(&sb); |
19e02f4f | 2928 | files_ref_path(refs, &sb, lock->ref_name); |
e9dcc305 | 2929 | if (unlink_or_msg(sb.buf, err)) { |
ce0af24d MH |
2930 | ret = TRANSACTION_GENERIC_ERROR; |
2931 | goto cleanup; | |
2932 | } | |
7bd9bcf3 | 2933 | } |
7bd9bcf3 MH |
2934 | } |
2935 | } | |
2936 | ||
00eebe35 | 2937 | clear_loose_ref_cache(refs); |
7bd9bcf3 MH |
2938 | |
2939 | cleanup: | |
dc39e099 | 2940 | files_transaction_cleanup(refs, transaction); |
7bd9bcf3 | 2941 | |
44639777 MH |
2942 | for (i = 0; i < transaction->nr; i++) { |
2943 | struct ref_update *update = transaction->updates[i]; | |
44639777 | 2944 | |
5f03e512 | 2945 | if (update->flags & REF_DELETED_RMDIR) { |
44639777 | 2946 | /* |
5f03e512 | 2947 | * The reference was deleted. Delete any |
44639777 MH |
2948 | * empty parent directories. (Note that this |
2949 | * can only work because we have already | |
2950 | * removed the lockfile.) | |
2951 | */ | |
802de3da | 2952 | try_remove_empty_parents(refs, update->refname, |
44639777 MH |
2953 | REMOVE_EMPTY_PARENTS_REF); |
2954 | } | |
2955 | } | |
2956 | ||
30173b88 | 2957 | strbuf_release(&sb); |
7bd9bcf3 MH |
2958 | return ret; |
2959 | } | |
2960 | ||
30173b88 MH |
2961 | static int files_transaction_abort(struct ref_store *ref_store, |
2962 | struct ref_transaction *transaction, | |
5cf88fd8 | 2963 | struct strbuf *err UNUSED) |
30173b88 | 2964 | { |
dc39e099 MH |
2965 | struct files_ref_store *refs = |
2966 | files_downcast(ref_store, 0, "ref_transaction_abort"); | |
2967 | ||
2968 | files_transaction_cleanup(refs, transaction); | |
30173b88 MH |
2969 | return 0; |
2970 | } | |
2971 | ||
7bd9bcf3 | 2972 | static int ref_present(const char *refname, |
5cf88fd8 ÆAB |
2973 | const struct object_id *oid UNUSED, |
2974 | int flags UNUSED, | |
63e14ee2 | 2975 | void *cb_data) |
7bd9bcf3 MH |
2976 | { |
2977 | struct string_list *affected_refnames = cb_data; | |
2978 | ||
2979 | return string_list_has_string(affected_refnames, refname); | |
2980 | } | |
2981 | ||
fc681463 DT |
2982 | static int files_initial_transaction_commit(struct ref_store *ref_store, |
2983 | struct ref_transaction *transaction, | |
2984 | struct strbuf *err) | |
7bd9bcf3 | 2985 | { |
d99825ab | 2986 | struct files_ref_store *refs = |
9e7ec634 NTND |
2987 | files_downcast(ref_store, REF_STORE_WRITE, |
2988 | "initial_ref_transaction_commit"); | |
43a2dfde MH |
2989 | size_t i; |
2990 | int ret = 0; | |
7bd9bcf3 | 2991 | struct string_list affected_refnames = STRING_LIST_INIT_NODUP; |
1444bfe0 | 2992 | struct ref_transaction *packed_transaction = NULL; |
7bd9bcf3 MH |
2993 | |
2994 | assert(err); | |
2995 | ||
2996 | if (transaction->state != REF_TRANSACTION_OPEN) | |
033abf97 | 2997 | BUG("commit called for transaction that is not open"); |
7bd9bcf3 MH |
2998 | |
2999 | /* Fail if a refname appears more than once in the transaction: */ | |
efe47281 MH |
3000 | for (i = 0; i < transaction->nr; i++) |
3001 | string_list_append(&affected_refnames, | |
3002 | transaction->updates[i]->refname); | |
7bd9bcf3 MH |
3003 | string_list_sort(&affected_refnames); |
3004 | if (ref_update_reject_duplicates(&affected_refnames, err)) { | |
3005 | ret = TRANSACTION_GENERIC_ERROR; | |
3006 | goto cleanup; | |
3007 | } | |
3008 | ||
3009 | /* | |
3010 | * It's really undefined to call this function in an active | |
3011 | * repository or when there are existing references: we are | |
3012 | * only locking and changing packed-refs, so (1) any | |
3013 | * simultaneous processes might try to change a reference at | |
3014 | * the same time we do, and (2) any existing loose versions of | |
3015 | * the references that we are setting would have precedence | |
3016 | * over our values. But some remote helpers create the remote | |
3017 | * "HEAD" and "master" branches before calling this function, | |
3018 | * so here we really only check that none of the references | |
3019 | * that we are creating already exists. | |
3020 | */ | |
2f40e954 NTND |
3021 | if (refs_for_each_rawref(&refs->base, ref_present, |
3022 | &affected_refnames)) | |
033abf97 | 3023 | BUG("initial ref transaction called with existing refs"); |
7bd9bcf3 | 3024 | |
c6da34a6 | 3025 | packed_transaction = ref_store_transaction_begin(refs->packed_ref_store, err); |
1444bfe0 MH |
3026 | if (!packed_transaction) { |
3027 | ret = TRANSACTION_GENERIC_ERROR; | |
3028 | goto cleanup; | |
3029 | } | |
3030 | ||
efe47281 MH |
3031 | for (i = 0; i < transaction->nr; i++) { |
3032 | struct ref_update *update = transaction->updates[i]; | |
7bd9bcf3 MH |
3033 | |
3034 | if ((update->flags & REF_HAVE_OLD) && | |
98491298 | 3035 | !is_null_oid(&update->old_oid)) |
033abf97 | 3036 | BUG("initial ref transaction with old_sha1 set"); |
7d2df051 NTND |
3037 | if (refs_verify_refname_available(&refs->base, update->refname, |
3038 | &affected_refnames, NULL, | |
3039 | err)) { | |
7bd9bcf3 MH |
3040 | ret = TRANSACTION_NAME_CONFLICT; |
3041 | goto cleanup; | |
3042 | } | |
1444bfe0 MH |
3043 | |
3044 | /* | |
3045 | * Add a reference creation for this reference to the | |
3046 | * packed-refs transaction: | |
3047 | */ | |
3048 | ref_transaction_add_update(packed_transaction, update->refname, | |
3049 | update->flags & ~REF_HAVE_OLD, | |
89f3bbdd | 3050 | &update->new_oid, &update->old_oid, |
1444bfe0 | 3051 | NULL); |
7bd9bcf3 MH |
3052 | } |
3053 | ||
c8bed835 | 3054 | if (packed_refs_lock(refs->packed_ref_store, 0, err)) { |
7bd9bcf3 MH |
3055 | ret = TRANSACTION_GENERIC_ERROR; |
3056 | goto cleanup; | |
3057 | } | |
3058 | ||
1444bfe0 | 3059 | if (initial_ref_transaction_commit(packed_transaction, err)) { |
7bd9bcf3 | 3060 | ret = TRANSACTION_GENERIC_ERROR; |
7bd9bcf3 MH |
3061 | } |
3062 | ||
81fcb698 | 3063 | packed_refs_unlock(refs->packed_ref_store); |
7bd9bcf3 | 3064 | cleanup: |
1444bfe0 MH |
3065 | if (packed_transaction) |
3066 | ref_transaction_free(packed_transaction); | |
7bd9bcf3 MH |
3067 | transaction->state = REF_TRANSACTION_CLOSED; |
3068 | string_list_clear(&affected_refnames, 0); | |
3069 | return ret; | |
3070 | } | |
3071 | ||
3072 | struct expire_reflog_cb { | |
7bd9bcf3 MH |
3073 | reflog_expiry_should_prune_fn *should_prune_fn; |
3074 | void *policy_cb; | |
3075 | FILE *newlog; | |
9461d272 | 3076 | struct object_id last_kept_oid; |
fcd2c3d9 ÆAB |
3077 | unsigned int rewrite:1, |
3078 | dry_run:1; | |
7bd9bcf3 MH |
3079 | }; |
3080 | ||
9461d272 | 3081 | static int expire_reflog_ent(struct object_id *ooid, struct object_id *noid, |
dddbad72 | 3082 | const char *email, timestamp_t timestamp, int tz, |
7bd9bcf3 MH |
3083 | const char *message, void *cb_data) |
3084 | { | |
3085 | struct expire_reflog_cb *cb = cb_data; | |
fcd2c3d9 | 3086 | reflog_expiry_should_prune_fn *fn = cb->should_prune_fn; |
7bd9bcf3 | 3087 | |
fcd2c3d9 | 3088 | if (cb->rewrite) |
9461d272 | 3089 | ooid = &cb->last_kept_oid; |
7bd9bcf3 | 3090 | |
fcd2c3d9 ÆAB |
3091 | if (fn(ooid, noid, email, timestamp, tz, message, cb->policy_cb)) |
3092 | return 0; | |
3093 | ||
3094 | if (cb->dry_run) | |
3095 | return 0; /* --dry-run */ | |
3096 | ||
3097 | fprintf(cb->newlog, "%s %s %s %"PRItime" %+05d\t%s", oid_to_hex(ooid), | |
3098 | oid_to_hex(noid), email, timestamp, tz, message); | |
3099 | oidcpy(&cb->last_kept_oid, noid); | |
3100 | ||
7bd9bcf3 MH |
3101 | return 0; |
3102 | } | |
3103 | ||
e3688bd6 | 3104 | static int files_reflog_expire(struct ref_store *ref_store, |
cc40b5ce | 3105 | const char *refname, |
fcd2c3d9 | 3106 | unsigned int expire_flags, |
e3688bd6 DT |
3107 | reflog_expiry_prepare_fn prepare_fn, |
3108 | reflog_expiry_should_prune_fn should_prune_fn, | |
3109 | reflog_expiry_cleanup_fn cleanup_fn, | |
3110 | void *policy_cb_data) | |
7bd9bcf3 | 3111 | { |
7eb27cdf | 3112 | struct files_ref_store *refs = |
9e7ec634 | 3113 | files_downcast(ref_store, REF_STORE_WRITE, "reflog_expire"); |
b2275868 | 3114 | struct lock_file reflog_lock = LOCK_INIT; |
7bd9bcf3 MH |
3115 | struct expire_reflog_cb cb; |
3116 | struct ref_lock *lock; | |
802de3da | 3117 | struct strbuf log_file_sb = STRBUF_INIT; |
7bd9bcf3 MH |
3118 | char *log_file; |
3119 | int status = 0; | |
7bd9bcf3 | 3120 | struct strbuf err = STRBUF_INIT; |
ae35e16c | 3121 | const struct object_id *oid; |
7bd9bcf3 MH |
3122 | |
3123 | memset(&cb, 0, sizeof(cb)); | |
fcd2c3d9 ÆAB |
3124 | cb.rewrite = !!(expire_flags & EXPIRE_REFLOGS_REWRITE); |
3125 | cb.dry_run = !!(expire_flags & EXPIRE_REFLOGS_DRY_RUN); | |
7bd9bcf3 MH |
3126 | cb.policy_cb = policy_cb_data; |
3127 | cb.should_prune_fn = should_prune_fn; | |
3128 | ||
3129 | /* | |
3130 | * The reflog file is locked by holding the lock on the | |
3131 | * reference itself, plus we might need to update the | |
3132 | * reference if --updateref was specified: | |
3133 | */ | |
52106430 | 3134 | lock = lock_ref_oid_basic(refs, refname, &err); |
7bd9bcf3 MH |
3135 | if (!lock) { |
3136 | error("cannot lock ref '%s': %s", refname, err.buf); | |
3137 | strbuf_release(&err); | |
3138 | return -1; | |
3139 | } | |
ae35e16c | 3140 | oid = &lock->old_oid; |
7aa7829f ÆAB |
3141 | |
3142 | /* | |
3143 | * When refs are deleted, their reflog is deleted before the | |
3144 | * ref itself is deleted. This is because there is no separate | |
3145 | * lock for reflog; instead we take a lock on the ref with | |
3146 | * lock_ref_oid_basic(). | |
3147 | * | |
3148 | * If a race happens and the reflog doesn't exist after we've | |
3149 | * acquired the lock that's OK. We've got nothing more to do; | |
3150 | * We were asked to delete the reflog, but someone else | |
3151 | * deleted it! The caller doesn't care that we deleted it, | |
3152 | * just that it is deleted. So we can return successfully. | |
3153 | */ | |
2f40e954 | 3154 | if (!refs_reflog_exists(ref_store, refname)) { |
7bd9bcf3 MH |
3155 | unlock_ref(lock); |
3156 | return 0; | |
3157 | } | |
3158 | ||
802de3da NTND |
3159 | files_reflog_path(refs, &log_file_sb, refname); |
3160 | log_file = strbuf_detach(&log_file_sb, NULL); | |
fcd2c3d9 | 3161 | if (!cb.dry_run) { |
7bd9bcf3 MH |
3162 | /* |
3163 | * Even though holding $GIT_DIR/logs/$reflog.lock has | |
3164 | * no locking implications, we use the lock_file | |
3165 | * machinery here anyway because it does a lot of the | |
3166 | * work we need, including cleaning up if the program | |
3167 | * exits unexpectedly. | |
3168 | */ | |
3169 | if (hold_lock_file_for_update(&reflog_lock, log_file, 0) < 0) { | |
3170 | struct strbuf err = STRBUF_INIT; | |
3171 | unable_to_lock_message(log_file, errno, &err); | |
3172 | error("%s", err.buf); | |
3173 | strbuf_release(&err); | |
3174 | goto failure; | |
3175 | } | |
3176 | cb.newlog = fdopen_lock_file(&reflog_lock, "w"); | |
3177 | if (!cb.newlog) { | |
3178 | error("cannot fdopen %s (%s)", | |
3179 | get_lock_file_path(&reflog_lock), strerror(errno)); | |
3180 | goto failure; | |
3181 | } | |
3182 | } | |
3183 | ||
0155f710 | 3184 | (*prepare_fn)(refname, oid, cb.policy_cb); |
2f40e954 | 3185 | refs_for_each_reflog_ent(ref_store, refname, expire_reflog_ent, &cb); |
7bd9bcf3 MH |
3186 | (*cleanup_fn)(cb.policy_cb); |
3187 | ||
fcd2c3d9 | 3188 | if (!cb.dry_run) { |
7bd9bcf3 MH |
3189 | /* |
3190 | * It doesn't make sense to adjust a reference pointed | |
3191 | * to by a symbolic ref based on expiring entries in | |
3192 | * the symbolic reference's reflog. Nor can we update | |
3193 | * a reference if there are no remaining reflog | |
3194 | * entries. | |
3195 | */ | |
52106430 ÆAB |
3196 | int update = 0; |
3197 | ||
fcd2c3d9 | 3198 | if ((expire_flags & EXPIRE_REFLOGS_UPDATE_REF) && |
52106430 | 3199 | !is_null_oid(&cb.last_kept_oid)) { |
52106430 ÆAB |
3200 | int type; |
3201 | const char *ref; | |
3202 | ||
f1da24ca | 3203 | ref = refs_resolve_ref_unsafe(&refs->base, refname, |
52106430 | 3204 | RESOLVE_REF_NO_RECURSE, |
ce14de03 | 3205 | NULL, &type); |
52106430 ÆAB |
3206 | update = !!(ref && !(type & REF_ISSYMREF)); |
3207 | } | |
7bd9bcf3 | 3208 | |
83a3069a | 3209 | if (close_lock_file_gently(&reflog_lock)) { |
7bd9bcf3 MH |
3210 | status |= error("couldn't write %s: %s", log_file, |
3211 | strerror(errno)); | |
83a3069a | 3212 | rollback_lock_file(&reflog_lock); |
7bd9bcf3 | 3213 | } else if (update && |
ee4d8e45 | 3214 | (write_in_full(get_lock_file_fd(&lock->lk), |
2ae2e2a1 | 3215 | oid_to_hex(&cb.last_kept_oid), the_hash_algo->hexsz) < 0 || |
88780c37 | 3216 | write_str_in_full(get_lock_file_fd(&lock->lk), "\n") < 0 || |
83a3069a | 3217 | close_ref_gently(lock) < 0)) { |
7bd9bcf3 | 3218 | status |= error("couldn't write %s", |
ee4d8e45 | 3219 | get_lock_file_path(&lock->lk)); |
7bd9bcf3 MH |
3220 | rollback_lock_file(&reflog_lock); |
3221 | } else if (commit_lock_file(&reflog_lock)) { | |
e0048d3e | 3222 | status |= error("unable to write reflog '%s' (%s)", |
7bd9bcf3 MH |
3223 | log_file, strerror(errno)); |
3224 | } else if (update && commit_ref(lock)) { | |
3225 | status |= error("couldn't set %s", lock->ref_name); | |
3226 | } | |
3227 | } | |
3228 | free(log_file); | |
3229 | unlock_ref(lock); | |
3230 | return status; | |
3231 | ||
3232 | failure: | |
3233 | rollback_lock_file(&reflog_lock); | |
3234 | free(log_file); | |
3235 | unlock_ref(lock); | |
3236 | return -1; | |
3237 | } | |
3dce444f | 3238 | |
2e573d61 | 3239 | static int files_init_db(struct ref_store *ref_store, |
2eb1d0c4 | 3240 | int flags, |
2e573d61 | 3241 | struct strbuf *err UNUSED) |
6fb5acfd | 3242 | { |
19e02f4f | 3243 | struct files_ref_store *refs = |
9e7ec634 | 3244 | files_downcast(ref_store, REF_STORE_WRITE, "init_db"); |
e9dcc305 NTND |
3245 | struct strbuf sb = STRBUF_INIT; |
3246 | ||
6fb5acfd | 3247 | /* |
c358d165 PS |
3248 | * We need to create a "refs" dir in any case so that older versions of |
3249 | * Git can tell that this is a repository. This serves two main purposes: | |
3250 | * | |
3251 | * - Clients will know to stop walking the parent-directory chain when | |
3252 | * detecting the Git repository. Otherwise they may end up detecting | |
3253 | * a Git repository in a parent directory instead. | |
3254 | * | |
3255 | * - Instead of failing to detect a repository with unknown reference | |
3256 | * format altogether, old clients will print an error saying that | |
3257 | * they do not understand the reference format extension. | |
6fb5acfd | 3258 | */ |
c358d165 | 3259 | strbuf_addf(&sb, "%s/refs", ref_store->gitdir); |
e9dcc305 | 3260 | safe_create_dir(sb.buf, 1); |
c358d165 | 3261 | adjust_shared_perm(sb.buf); |
e9dcc305 | 3262 | |
6fb5acfd | 3263 | /* |
2eb1d0c4 PS |
3264 | * There is no need to create directories for common refs when creating |
3265 | * a worktree ref store. | |
6fb5acfd | 3266 | */ |
2eb1d0c4 PS |
3267 | if (!(flags & REFS_INIT_DB_IS_WORKTREE)) { |
3268 | /* | |
3269 | * Create .git/refs/{heads,tags} | |
3270 | */ | |
3271 | strbuf_reset(&sb); | |
3272 | files_ref_path(refs, &sb, "refs/heads"); | |
3273 | safe_create_dir(sb.buf, 1); | |
e9dcc305 | 3274 | |
2eb1d0c4 PS |
3275 | strbuf_reset(&sb); |
3276 | files_ref_path(refs, &sb, "refs/tags"); | |
3277 | safe_create_dir(sb.buf, 1); | |
3278 | } | |
e9dcc305 NTND |
3279 | |
3280 | strbuf_release(&sb); | |
6fb5acfd DT |
3281 | return 0; |
3282 | } | |
3283 | ||
3dce444f | 3284 | struct ref_storage_be refs_be_files = { |
32bff617 ÆAB |
3285 | .name = "files", |
3286 | .init = files_ref_store_create, | |
3287 | .init_db = files_init_db, | |
3288 | .transaction_prepare = files_transaction_prepare, | |
3289 | .transaction_finish = files_transaction_finish, | |
3290 | .transaction_abort = files_transaction_abort, | |
3291 | .initial_transaction_commit = files_initial_transaction_commit, | |
3292 | ||
3293 | .pack_refs = files_pack_refs, | |
3294 | .create_symref = files_create_symref, | |
32bff617 ÆAB |
3295 | .rename_ref = files_rename_ref, |
3296 | .copy_ref = files_copy_ref, | |
3297 | ||
3298 | .iterator_begin = files_ref_iterator_begin, | |
3299 | .read_raw_ref = files_read_raw_ref, | |
3300 | .read_symbolic_ref = files_read_symbolic_ref, | |
3301 | ||
3302 | .reflog_iterator_begin = files_reflog_iterator_begin, | |
3303 | .for_each_reflog_ent = files_for_each_reflog_ent, | |
3304 | .for_each_reflog_ent_reverse = files_for_each_reflog_ent_reverse, | |
3305 | .reflog_exists = files_reflog_exists, | |
3306 | .create_reflog = files_create_reflog, | |
3307 | .delete_reflog = files_delete_reflog, | |
3308 | .reflog_expire = files_reflog_expire | |
3dce444f | 3309 | }; |