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Commit | Line | Data |
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7bd9bcf3 MH |
1 | #include "../cache.h" |
2 | #include "../refs.h" | |
3 | #include "refs-internal.h" | |
958f9646 | 4 | #include "ref-cache.h" |
67be7c5a | 5 | #include "packed-backend.h" |
3bc581b9 | 6 | #include "../iterator.h" |
2880d16f | 7 | #include "../dir-iterator.h" |
7bd9bcf3 MH |
8 | #include "../lockfile.h" |
9 | #include "../object.h" | |
10 | #include "../dir.h" | |
11 | ||
12 | struct ref_lock { | |
13 | char *ref_name; | |
7bd9bcf3 MH |
14 | struct lock_file *lk; |
15 | struct object_id old_oid; | |
16 | }; | |
17 | ||
7bd9bcf3 MH |
18 | /* |
19 | * Future: need to be in "struct repository" | |
20 | * when doing a full libification. | |
21 | */ | |
00eebe35 MH |
22 | struct files_ref_store { |
23 | struct ref_store base; | |
9e7ec634 | 24 | unsigned int store_flags; |
32c597e7 | 25 | |
f57f37e2 NTND |
26 | char *gitdir; |
27 | char *gitcommondir; | |
33dfb9f3 | 28 | |
7c22bc8a | 29 | struct ref_cache *loose; |
55c6bc37 | 30 | |
e0cc8ac8 | 31 | struct ref_store *packed_ref_store; |
00eebe35 | 32 | }; |
7bd9bcf3 | 33 | |
65a0a8e5 | 34 | static void clear_loose_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 MH |
35 | { |
36 | if (refs->loose) { | |
7c22bc8a | 37 | free_ref_cache(refs->loose); |
7bd9bcf3 MH |
38 | refs->loose = NULL; |
39 | } | |
40 | } | |
41 | ||
a2d5156c JK |
42 | /* |
43 | * Create a new submodule ref cache and add it to the internal | |
44 | * set of caches. | |
45 | */ | |
9e7ec634 NTND |
46 | static struct ref_store *files_ref_store_create(const char *gitdir, |
47 | unsigned int flags) | |
7bd9bcf3 | 48 | { |
00eebe35 MH |
49 | struct files_ref_store *refs = xcalloc(1, sizeof(*refs)); |
50 | struct ref_store *ref_store = (struct ref_store *)refs; | |
f57f37e2 | 51 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 | 52 | |
fbfd0a29 | 53 | base_ref_store_init(ref_store, &refs_be_files); |
9e7ec634 | 54 | refs->store_flags = flags; |
7bd9bcf3 | 55 | |
f57f37e2 NTND |
56 | refs->gitdir = xstrdup(gitdir); |
57 | get_common_dir_noenv(&sb, gitdir); | |
58 | refs->gitcommondir = strbuf_detach(&sb, NULL); | |
59 | strbuf_addf(&sb, "%s/packed-refs", refs->gitcommondir); | |
e0d48397 MH |
60 | refs->packed_ref_store = packed_ref_store_create(sb.buf, flags); |
61 | strbuf_release(&sb); | |
7bd9bcf3 | 62 | |
00eebe35 | 63 | return ref_store; |
a2d5156c | 64 | } |
7bd9bcf3 | 65 | |
32c597e7 | 66 | /* |
9e7ec634 NTND |
67 | * Die if refs is not the main ref store. caller is used in any |
68 | * necessary error messages. | |
32c597e7 MH |
69 | */ |
70 | static void files_assert_main_repository(struct files_ref_store *refs, | |
71 | const char *caller) | |
72 | { | |
9e7ec634 NTND |
73 | if (refs->store_flags & REF_STORE_MAIN) |
74 | return; | |
75 | ||
76 | die("BUG: operation %s only allowed for main ref store", caller); | |
32c597e7 MH |
77 | } |
78 | ||
a2d5156c | 79 | /* |
00eebe35 | 80 | * Downcast ref_store to files_ref_store. Die if ref_store is not a |
9e7ec634 NTND |
81 | * files_ref_store. required_flags is compared with ref_store's |
82 | * store_flags to ensure the ref_store has all required capabilities. | |
83 | * "caller" is used in any necessary error messages. | |
a2d5156c | 84 | */ |
9e7ec634 NTND |
85 | static struct files_ref_store *files_downcast(struct ref_store *ref_store, |
86 | unsigned int required_flags, | |
87 | const char *caller) | |
a2d5156c | 88 | { |
32c597e7 MH |
89 | struct files_ref_store *refs; |
90 | ||
00eebe35 MH |
91 | if (ref_store->be != &refs_be_files) |
92 | die("BUG: ref_store is type \"%s\" not \"files\" in %s", | |
93 | ref_store->be->name, caller); | |
2eed2780 | 94 | |
32c597e7 MH |
95 | refs = (struct files_ref_store *)ref_store; |
96 | ||
9e7ec634 NTND |
97 | if ((refs->store_flags & required_flags) != required_flags) |
98 | die("BUG: operation %s requires abilities 0x%x, but only have 0x%x", | |
99 | caller, required_flags, refs->store_flags); | |
2eed2780 | 100 | |
32c597e7 | 101 | return refs; |
7bd9bcf3 MH |
102 | } |
103 | ||
802de3da NTND |
104 | static void files_reflog_path(struct files_ref_store *refs, |
105 | struct strbuf *sb, | |
106 | const char *refname) | |
107 | { | |
108 | if (!refname) { | |
f57f37e2 NTND |
109 | /* |
110 | * FIXME: of course this is wrong in multi worktree | |
111 | * setting. To be fixed real soon. | |
112 | */ | |
113 | strbuf_addf(sb, "%s/logs", refs->gitcommondir); | |
802de3da NTND |
114 | return; |
115 | } | |
116 | ||
f57f37e2 NTND |
117 | switch (ref_type(refname)) { |
118 | case REF_TYPE_PER_WORKTREE: | |
119 | case REF_TYPE_PSEUDOREF: | |
120 | strbuf_addf(sb, "%s/logs/%s", refs->gitdir, refname); | |
121 | break; | |
122 | case REF_TYPE_NORMAL: | |
123 | strbuf_addf(sb, "%s/logs/%s", refs->gitcommondir, refname); | |
124 | break; | |
125 | default: | |
126 | die("BUG: unknown ref type %d of ref %s", | |
127 | ref_type(refname), refname); | |
128 | } | |
802de3da NTND |
129 | } |
130 | ||
19e02f4f NTND |
131 | static void files_ref_path(struct files_ref_store *refs, |
132 | struct strbuf *sb, | |
133 | const char *refname) | |
134 | { | |
f57f37e2 NTND |
135 | switch (ref_type(refname)) { |
136 | case REF_TYPE_PER_WORKTREE: | |
137 | case REF_TYPE_PSEUDOREF: | |
138 | strbuf_addf(sb, "%s/%s", refs->gitdir, refname); | |
139 | break; | |
140 | case REF_TYPE_NORMAL: | |
141 | strbuf_addf(sb, "%s/%s", refs->gitcommondir, refname); | |
142 | break; | |
143 | default: | |
144 | die("BUG: unknown ref type %d of ref %s", | |
145 | ref_type(refname), refname); | |
146 | } | |
19e02f4f NTND |
147 | } |
148 | ||
7bd9bcf3 MH |
149 | /* |
150 | * Read the loose references from the namespace dirname into dir | |
151 | * (without recursing). dirname must end with '/'. dir must be the | |
152 | * directory entry corresponding to dirname. | |
153 | */ | |
df308759 MH |
154 | static void loose_fill_ref_dir(struct ref_store *ref_store, |
155 | struct ref_dir *dir, const char *dirname) | |
7bd9bcf3 | 156 | { |
df308759 MH |
157 | struct files_ref_store *refs = |
158 | files_downcast(ref_store, REF_STORE_READ, "fill_ref_dir"); | |
7bd9bcf3 MH |
159 | DIR *d; |
160 | struct dirent *de; | |
161 | int dirnamelen = strlen(dirname); | |
162 | struct strbuf refname; | |
163 | struct strbuf path = STRBUF_INIT; | |
164 | size_t path_baselen; | |
165 | ||
19e02f4f | 166 | files_ref_path(refs, &path, dirname); |
7bd9bcf3 MH |
167 | path_baselen = path.len; |
168 | ||
169 | d = opendir(path.buf); | |
170 | if (!d) { | |
171 | strbuf_release(&path); | |
172 | return; | |
173 | } | |
174 | ||
175 | strbuf_init(&refname, dirnamelen + 257); | |
176 | strbuf_add(&refname, dirname, dirnamelen); | |
177 | ||
178 | while ((de = readdir(d)) != NULL) { | |
4417df8c | 179 | struct object_id oid; |
7bd9bcf3 MH |
180 | struct stat st; |
181 | int flag; | |
182 | ||
183 | if (de->d_name[0] == '.') | |
184 | continue; | |
185 | if (ends_with(de->d_name, ".lock")) | |
186 | continue; | |
187 | strbuf_addstr(&refname, de->d_name); | |
188 | strbuf_addstr(&path, de->d_name); | |
189 | if (stat(path.buf, &st) < 0) { | |
190 | ; /* silently ignore */ | |
191 | } else if (S_ISDIR(st.st_mode)) { | |
192 | strbuf_addch(&refname, '/'); | |
193 | add_entry_to_dir(dir, | |
e00d1a4f | 194 | create_dir_entry(dir->cache, refname.buf, |
7bd9bcf3 MH |
195 | refname.len, 1)); |
196 | } else { | |
7d2df051 | 197 | if (!refs_resolve_ref_unsafe(&refs->base, |
3c0cb0cb MH |
198 | refname.buf, |
199 | RESOLVE_REF_READING, | |
4417df8c | 200 | oid.hash, &flag)) { |
201 | oidclr(&oid); | |
7bd9bcf3 | 202 | flag |= REF_ISBROKEN; |
4417df8c | 203 | } else if (is_null_oid(&oid)) { |
7bd9bcf3 MH |
204 | /* |
205 | * It is so astronomically unlikely | |
206 | * that NULL_SHA1 is the SHA-1 of an | |
207 | * actual object that we consider its | |
208 | * appearance in a loose reference | |
209 | * file to be repo corruption | |
210 | * (probably due to a software bug). | |
211 | */ | |
212 | flag |= REF_ISBROKEN; | |
213 | } | |
214 | ||
215 | if (check_refname_format(refname.buf, | |
216 | REFNAME_ALLOW_ONELEVEL)) { | |
217 | if (!refname_is_safe(refname.buf)) | |
218 | die("loose refname is dangerous: %s", refname.buf); | |
4417df8c | 219 | oidclr(&oid); |
7bd9bcf3 MH |
220 | flag |= REF_BAD_NAME | REF_ISBROKEN; |
221 | } | |
222 | add_entry_to_dir(dir, | |
c1da06c6 | 223 | create_ref_entry(refname.buf, &oid, flag)); |
7bd9bcf3 MH |
224 | } |
225 | strbuf_setlen(&refname, dirnamelen); | |
226 | strbuf_setlen(&path, path_baselen); | |
227 | } | |
228 | strbuf_release(&refname); | |
229 | strbuf_release(&path); | |
230 | closedir(d); | |
e3bf2989 MH |
231 | |
232 | /* | |
233 | * Manually add refs/bisect, which, being per-worktree, might | |
234 | * not appear in the directory listing for refs/ in the main | |
235 | * repo. | |
236 | */ | |
237 | if (!strcmp(dirname, "refs/")) { | |
238 | int pos = search_ref_dir(dir, "refs/bisect/", 12); | |
239 | ||
240 | if (pos < 0) { | |
241 | struct ref_entry *child_entry = create_dir_entry( | |
242 | dir->cache, "refs/bisect/", 12, 1); | |
243 | add_entry_to_dir(dir, child_entry); | |
244 | } | |
245 | } | |
7bd9bcf3 MH |
246 | } |
247 | ||
a714b19c | 248 | static struct ref_cache *get_loose_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 MH |
249 | { |
250 | if (!refs->loose) { | |
251 | /* | |
252 | * Mark the top-level directory complete because we | |
253 | * are about to read the only subdirectory that can | |
254 | * hold references: | |
255 | */ | |
df308759 | 256 | refs->loose = create_ref_cache(&refs->base, loose_fill_ref_dir); |
7c22bc8a MH |
257 | |
258 | /* We're going to fill the top level ourselves: */ | |
259 | refs->loose->root->flag &= ~REF_INCOMPLETE; | |
260 | ||
7bd9bcf3 | 261 | /* |
7c22bc8a MH |
262 | * Add an incomplete entry for "refs/" (to be filled |
263 | * lazily): | |
7bd9bcf3 | 264 | */ |
7c22bc8a | 265 | add_entry_to_dir(get_ref_dir(refs->loose->root), |
e00d1a4f | 266 | create_dir_entry(refs->loose, "refs/", 5, 1)); |
7bd9bcf3 | 267 | } |
a714b19c | 268 | return refs->loose; |
7bd9bcf3 MH |
269 | } |
270 | ||
e1e33b72 MH |
271 | static int files_read_raw_ref(struct ref_store *ref_store, |
272 | const char *refname, unsigned char *sha1, | |
273 | struct strbuf *referent, unsigned int *type) | |
7bd9bcf3 | 274 | { |
4308651c | 275 | struct files_ref_store *refs = |
9e7ec634 | 276 | files_downcast(ref_store, REF_STORE_READ, "read_raw_ref"); |
42a38cf7 MH |
277 | struct strbuf sb_contents = STRBUF_INIT; |
278 | struct strbuf sb_path = STRBUF_INIT; | |
7048653a DT |
279 | const char *path; |
280 | const char *buf; | |
281 | struct stat st; | |
282 | int fd; | |
42a38cf7 MH |
283 | int ret = -1; |
284 | int save_errno; | |
e8c42cb9 | 285 | int remaining_retries = 3; |
7bd9bcf3 | 286 | |
fa96ea1b | 287 | *type = 0; |
42a38cf7 | 288 | strbuf_reset(&sb_path); |
34c7ad8f | 289 | |
19e02f4f | 290 | files_ref_path(refs, &sb_path, refname); |
34c7ad8f | 291 | |
42a38cf7 | 292 | path = sb_path.buf; |
7bd9bcf3 | 293 | |
7048653a DT |
294 | stat_ref: |
295 | /* | |
296 | * We might have to loop back here to avoid a race | |
297 | * condition: first we lstat() the file, then we try | |
298 | * to read it as a link or as a file. But if somebody | |
299 | * changes the type of the file (file <-> directory | |
300 | * <-> symlink) between the lstat() and reading, then | |
301 | * we don't want to report that as an error but rather | |
302 | * try again starting with the lstat(). | |
e8c42cb9 JK |
303 | * |
304 | * We'll keep a count of the retries, though, just to avoid | |
305 | * any confusing situation sending us into an infinite loop. | |
7048653a | 306 | */ |
7bd9bcf3 | 307 | |
e8c42cb9 JK |
308 | if (remaining_retries-- <= 0) |
309 | goto out; | |
310 | ||
7048653a DT |
311 | if (lstat(path, &st) < 0) { |
312 | if (errno != ENOENT) | |
42a38cf7 | 313 | goto out; |
e0cc8ac8 MH |
314 | if (refs_read_raw_ref(refs->packed_ref_store, refname, |
315 | sha1, referent, type)) { | |
7048653a | 316 | errno = ENOENT; |
42a38cf7 | 317 | goto out; |
7bd9bcf3 | 318 | } |
42a38cf7 MH |
319 | ret = 0; |
320 | goto out; | |
7bd9bcf3 | 321 | } |
7bd9bcf3 | 322 | |
7048653a DT |
323 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
324 | if (S_ISLNK(st.st_mode)) { | |
42a38cf7 MH |
325 | strbuf_reset(&sb_contents); |
326 | if (strbuf_readlink(&sb_contents, path, 0) < 0) { | |
7048653a | 327 | if (errno == ENOENT || errno == EINVAL) |
7bd9bcf3 MH |
328 | /* inconsistent with lstat; retry */ |
329 | goto stat_ref; | |
330 | else | |
42a38cf7 | 331 | goto out; |
7bd9bcf3 | 332 | } |
42a38cf7 MH |
333 | if (starts_with(sb_contents.buf, "refs/") && |
334 | !check_refname_format(sb_contents.buf, 0)) { | |
92b38093 | 335 | strbuf_swap(&sb_contents, referent); |
3a0b6b9a | 336 | *type |= REF_ISSYMREF; |
42a38cf7 MH |
337 | ret = 0; |
338 | goto out; | |
7bd9bcf3 | 339 | } |
3f7bd767 JK |
340 | /* |
341 | * It doesn't look like a refname; fall through to just | |
342 | * treating it like a non-symlink, and reading whatever it | |
343 | * points to. | |
344 | */ | |
7048653a | 345 | } |
7bd9bcf3 | 346 | |
7048653a DT |
347 | /* Is it a directory? */ |
348 | if (S_ISDIR(st.st_mode)) { | |
e167a567 MH |
349 | /* |
350 | * Even though there is a directory where the loose | |
351 | * ref is supposed to be, there could still be a | |
352 | * packed ref: | |
353 | */ | |
e0cc8ac8 MH |
354 | if (refs_read_raw_ref(refs->packed_ref_store, refname, |
355 | sha1, referent, type)) { | |
e167a567 MH |
356 | errno = EISDIR; |
357 | goto out; | |
358 | } | |
359 | ret = 0; | |
42a38cf7 | 360 | goto out; |
7048653a DT |
361 | } |
362 | ||
363 | /* | |
364 | * Anything else, just open it and try to use it as | |
365 | * a ref | |
366 | */ | |
367 | fd = open(path, O_RDONLY); | |
368 | if (fd < 0) { | |
3f7bd767 | 369 | if (errno == ENOENT && !S_ISLNK(st.st_mode)) |
7048653a DT |
370 | /* inconsistent with lstat; retry */ |
371 | goto stat_ref; | |
372 | else | |
42a38cf7 | 373 | goto out; |
7048653a | 374 | } |
42a38cf7 MH |
375 | strbuf_reset(&sb_contents); |
376 | if (strbuf_read(&sb_contents, fd, 256) < 0) { | |
7048653a DT |
377 | int save_errno = errno; |
378 | close(fd); | |
379 | errno = save_errno; | |
42a38cf7 | 380 | goto out; |
7048653a DT |
381 | } |
382 | close(fd); | |
42a38cf7 MH |
383 | strbuf_rtrim(&sb_contents); |
384 | buf = sb_contents.buf; | |
7048653a DT |
385 | if (starts_with(buf, "ref:")) { |
386 | buf += 4; | |
7bd9bcf3 MH |
387 | while (isspace(*buf)) |
388 | buf++; | |
7048653a | 389 | |
92b38093 MH |
390 | strbuf_reset(referent); |
391 | strbuf_addstr(referent, buf); | |
3a0b6b9a | 392 | *type |= REF_ISSYMREF; |
42a38cf7 MH |
393 | ret = 0; |
394 | goto out; | |
7bd9bcf3 | 395 | } |
7bd9bcf3 | 396 | |
7048653a DT |
397 | /* |
398 | * Please note that FETCH_HEAD has additional | |
399 | * data after the sha. | |
400 | */ | |
401 | if (get_sha1_hex(buf, sha1) || | |
402 | (buf[40] != '\0' && !isspace(buf[40]))) { | |
3a0b6b9a | 403 | *type |= REF_ISBROKEN; |
7048653a | 404 | errno = EINVAL; |
42a38cf7 | 405 | goto out; |
7048653a DT |
406 | } |
407 | ||
42a38cf7 | 408 | ret = 0; |
7bd9bcf3 | 409 | |
42a38cf7 MH |
410 | out: |
411 | save_errno = errno; | |
7bd9bcf3 MH |
412 | strbuf_release(&sb_path); |
413 | strbuf_release(&sb_contents); | |
42a38cf7 | 414 | errno = save_errno; |
7bd9bcf3 MH |
415 | return ret; |
416 | } | |
417 | ||
8415d247 MH |
418 | static void unlock_ref(struct ref_lock *lock) |
419 | { | |
420 | /* Do not free lock->lk -- atexit() still looks at them */ | |
421 | if (lock->lk) | |
422 | rollback_lock_file(lock->lk); | |
423 | free(lock->ref_name); | |
8415d247 MH |
424 | free(lock); |
425 | } | |
426 | ||
92b1551b MH |
427 | /* |
428 | * Lock refname, without following symrefs, and set *lock_p to point | |
429 | * at a newly-allocated lock object. Fill in lock->old_oid, referent, | |
430 | * and type similarly to read_raw_ref(). | |
431 | * | |
432 | * The caller must verify that refname is a "safe" reference name (in | |
433 | * the sense of refname_is_safe()) before calling this function. | |
434 | * | |
435 | * If the reference doesn't already exist, verify that refname doesn't | |
436 | * have a D/F conflict with any existing references. extras and skip | |
524a9fdb | 437 | * are passed to refs_verify_refname_available() for this check. |
92b1551b MH |
438 | * |
439 | * If mustexist is not set and the reference is not found or is | |
440 | * broken, lock the reference anyway but clear sha1. | |
441 | * | |
442 | * Return 0 on success. On failure, write an error message to err and | |
443 | * return TRANSACTION_NAME_CONFLICT or TRANSACTION_GENERIC_ERROR. | |
444 | * | |
445 | * Implementation note: This function is basically | |
446 | * | |
447 | * lock reference | |
448 | * read_raw_ref() | |
449 | * | |
450 | * but it includes a lot more code to | |
451 | * - Deal with possible races with other processes | |
524a9fdb | 452 | * - Avoid calling refs_verify_refname_available() when it can be |
92b1551b MH |
453 | * avoided, namely if we were successfully able to read the ref |
454 | * - Generate informative error messages in the case of failure | |
455 | */ | |
f7b0a987 MH |
456 | static int lock_raw_ref(struct files_ref_store *refs, |
457 | const char *refname, int mustexist, | |
92b1551b MH |
458 | const struct string_list *extras, |
459 | const struct string_list *skip, | |
460 | struct ref_lock **lock_p, | |
461 | struct strbuf *referent, | |
462 | unsigned int *type, | |
463 | struct strbuf *err) | |
464 | { | |
465 | struct ref_lock *lock; | |
466 | struct strbuf ref_file = STRBUF_INIT; | |
467 | int attempts_remaining = 3; | |
468 | int ret = TRANSACTION_GENERIC_ERROR; | |
469 | ||
470 | assert(err); | |
32c597e7 | 471 | files_assert_main_repository(refs, "lock_raw_ref"); |
f7b0a987 | 472 | |
92b1551b MH |
473 | *type = 0; |
474 | ||
475 | /* First lock the file so it can't change out from under us. */ | |
476 | ||
477 | *lock_p = lock = xcalloc(1, sizeof(*lock)); | |
478 | ||
479 | lock->ref_name = xstrdup(refname); | |
19e02f4f | 480 | files_ref_path(refs, &ref_file, refname); |
92b1551b MH |
481 | |
482 | retry: | |
483 | switch (safe_create_leading_directories(ref_file.buf)) { | |
484 | case SCLD_OK: | |
485 | break; /* success */ | |
486 | case SCLD_EXISTS: | |
487 | /* | |
488 | * Suppose refname is "refs/foo/bar". We just failed | |
489 | * to create the containing directory, "refs/foo", | |
490 | * because there was a non-directory in the way. This | |
491 | * indicates a D/F conflict, probably because of | |
492 | * another reference such as "refs/foo". There is no | |
493 | * reason to expect this error to be transitory. | |
494 | */ | |
7d2df051 NTND |
495 | if (refs_verify_refname_available(&refs->base, refname, |
496 | extras, skip, err)) { | |
92b1551b MH |
497 | if (mustexist) { |
498 | /* | |
499 | * To the user the relevant error is | |
500 | * that the "mustexist" reference is | |
501 | * missing: | |
502 | */ | |
503 | strbuf_reset(err); | |
504 | strbuf_addf(err, "unable to resolve reference '%s'", | |
505 | refname); | |
506 | } else { | |
507 | /* | |
508 | * The error message set by | |
524a9fdb MH |
509 | * refs_verify_refname_available() is |
510 | * OK. | |
92b1551b MH |
511 | */ |
512 | ret = TRANSACTION_NAME_CONFLICT; | |
513 | } | |
514 | } else { | |
515 | /* | |
516 | * The file that is in the way isn't a loose | |
517 | * reference. Report it as a low-level | |
518 | * failure. | |
519 | */ | |
520 | strbuf_addf(err, "unable to create lock file %s.lock; " | |
521 | "non-directory in the way", | |
522 | ref_file.buf); | |
523 | } | |
524 | goto error_return; | |
525 | case SCLD_VANISHED: | |
526 | /* Maybe another process was tidying up. Try again. */ | |
527 | if (--attempts_remaining > 0) | |
528 | goto retry; | |
529 | /* fall through */ | |
530 | default: | |
531 | strbuf_addf(err, "unable to create directory for %s", | |
532 | ref_file.buf); | |
533 | goto error_return; | |
534 | } | |
535 | ||
536 | if (!lock->lk) | |
537 | lock->lk = xcalloc(1, sizeof(struct lock_file)); | |
538 | ||
539 | if (hold_lock_file_for_update(lock->lk, ref_file.buf, LOCK_NO_DEREF) < 0) { | |
540 | if (errno == ENOENT && --attempts_remaining > 0) { | |
541 | /* | |
542 | * Maybe somebody just deleted one of the | |
543 | * directories leading to ref_file. Try | |
544 | * again: | |
545 | */ | |
546 | goto retry; | |
547 | } else { | |
548 | unable_to_lock_message(ref_file.buf, errno, err); | |
549 | goto error_return; | |
550 | } | |
551 | } | |
552 | ||
553 | /* | |
554 | * Now we hold the lock and can read the reference without | |
555 | * fear that its value will change. | |
556 | */ | |
557 | ||
f7b0a987 | 558 | if (files_read_raw_ref(&refs->base, refname, |
e1e33b72 | 559 | lock->old_oid.hash, referent, type)) { |
92b1551b MH |
560 | if (errno == ENOENT) { |
561 | if (mustexist) { | |
562 | /* Garden variety missing reference. */ | |
563 | strbuf_addf(err, "unable to resolve reference '%s'", | |
564 | refname); | |
565 | goto error_return; | |
566 | } else { | |
567 | /* | |
568 | * Reference is missing, but that's OK. We | |
569 | * know that there is not a conflict with | |
570 | * another loose reference because | |
571 | * (supposing that we are trying to lock | |
572 | * reference "refs/foo/bar"): | |
573 | * | |
574 | * - We were successfully able to create | |
575 | * the lockfile refs/foo/bar.lock, so we | |
576 | * know there cannot be a loose reference | |
577 | * named "refs/foo". | |
578 | * | |
579 | * - We got ENOENT and not EISDIR, so we | |
580 | * know that there cannot be a loose | |
581 | * reference named "refs/foo/bar/baz". | |
582 | */ | |
583 | } | |
584 | } else if (errno == EISDIR) { | |
585 | /* | |
586 | * There is a directory in the way. It might have | |
587 | * contained references that have been deleted. If | |
588 | * we don't require that the reference already | |
589 | * exists, try to remove the directory so that it | |
590 | * doesn't cause trouble when we want to rename the | |
591 | * lockfile into place later. | |
592 | */ | |
593 | if (mustexist) { | |
594 | /* Garden variety missing reference. */ | |
595 | strbuf_addf(err, "unable to resolve reference '%s'", | |
596 | refname); | |
597 | goto error_return; | |
598 | } else if (remove_dir_recursively(&ref_file, | |
599 | REMOVE_DIR_EMPTY_ONLY)) { | |
b05855b5 MH |
600 | if (refs_verify_refname_available( |
601 | &refs->base, refname, | |
602 | extras, skip, err)) { | |
92b1551b MH |
603 | /* |
604 | * The error message set by | |
605 | * verify_refname_available() is OK. | |
606 | */ | |
607 | ret = TRANSACTION_NAME_CONFLICT; | |
608 | goto error_return; | |
609 | } else { | |
610 | /* | |
611 | * We can't delete the directory, | |
612 | * but we also don't know of any | |
613 | * references that it should | |
614 | * contain. | |
615 | */ | |
616 | strbuf_addf(err, "there is a non-empty directory '%s' " | |
617 | "blocking reference '%s'", | |
618 | ref_file.buf, refname); | |
619 | goto error_return; | |
620 | } | |
621 | } | |
622 | } else if (errno == EINVAL && (*type & REF_ISBROKEN)) { | |
623 | strbuf_addf(err, "unable to resolve reference '%s': " | |
624 | "reference broken", refname); | |
625 | goto error_return; | |
626 | } else { | |
627 | strbuf_addf(err, "unable to resolve reference '%s': %s", | |
628 | refname, strerror(errno)); | |
629 | goto error_return; | |
630 | } | |
631 | ||
632 | /* | |
633 | * If the ref did not exist and we are creating it, | |
524a9fdb MH |
634 | * make sure there is no existing ref that conflicts |
635 | * with refname: | |
92b1551b | 636 | */ |
524a9fdb MH |
637 | if (refs_verify_refname_available( |
638 | &refs->base, refname, | |
639 | extras, skip, err)) | |
92b1551b | 640 | goto error_return; |
92b1551b MH |
641 | } |
642 | ||
643 | ret = 0; | |
644 | goto out; | |
645 | ||
646 | error_return: | |
647 | unlock_ref(lock); | |
648 | *lock_p = NULL; | |
649 | ||
650 | out: | |
651 | strbuf_release(&ref_file); | |
652 | return ret; | |
653 | } | |
654 | ||
bd427cf2 MH |
655 | static int files_peel_ref(struct ref_store *ref_store, |
656 | const char *refname, unsigned char *sha1) | |
7bd9bcf3 | 657 | { |
9e7ec634 NTND |
658 | struct files_ref_store *refs = |
659 | files_downcast(ref_store, REF_STORE_READ | REF_STORE_ODB, | |
660 | "peel_ref"); | |
7bd9bcf3 MH |
661 | int flag; |
662 | unsigned char base[20]; | |
663 | ||
4c4de895 MH |
664 | if (current_ref_iter && current_ref_iter->refname == refname) { |
665 | struct object_id peeled; | |
666 | ||
667 | if (ref_iterator_peel(current_ref_iter, &peeled)) | |
7bd9bcf3 | 668 | return -1; |
4c4de895 | 669 | hashcpy(sha1, peeled.hash); |
7bd9bcf3 MH |
670 | return 0; |
671 | } | |
672 | ||
2f40e954 NTND |
673 | if (refs_read_ref_full(ref_store, refname, |
674 | RESOLVE_REF_READING, base, &flag)) | |
7bd9bcf3 MH |
675 | return -1; |
676 | ||
677 | /* | |
678 | * If the reference is packed, read its ref_entry from the | |
679 | * cache in the hope that we already know its peeled value. | |
680 | * We only try this optimization on packed references because | |
681 | * (a) forcing the filling of the loose reference cache could | |
682 | * be expensive and (b) loose references anyway usually do not | |
683 | * have REF_KNOWS_PEELED. | |
684 | */ | |
6dc6ba70 | 685 | if (flag & REF_ISPACKED && |
e0cc8ac8 | 686 | !refs_peel_ref(refs->packed_ref_store, refname, sha1)) |
6dc6ba70 | 687 | return 0; |
7bd9bcf3 MH |
688 | |
689 | return peel_object(base, sha1); | |
690 | } | |
691 | ||
3bc581b9 MH |
692 | struct files_ref_iterator { |
693 | struct ref_iterator base; | |
694 | ||
3bc581b9 MH |
695 | struct ref_iterator *iter0; |
696 | unsigned int flags; | |
697 | }; | |
7bd9bcf3 | 698 | |
3bc581b9 MH |
699 | static int files_ref_iterator_advance(struct ref_iterator *ref_iterator) |
700 | { | |
701 | struct files_ref_iterator *iter = | |
702 | (struct files_ref_iterator *)ref_iterator; | |
703 | int ok; | |
7bd9bcf3 | 704 | |
3bc581b9 | 705 | while ((ok = ref_iterator_advance(iter->iter0)) == ITER_OK) { |
0c09ec07 DT |
706 | if (iter->flags & DO_FOR_EACH_PER_WORKTREE_ONLY && |
707 | ref_type(iter->iter0->refname) != REF_TYPE_PER_WORKTREE) | |
708 | continue; | |
709 | ||
3bc581b9 MH |
710 | if (!(iter->flags & DO_FOR_EACH_INCLUDE_BROKEN) && |
711 | !ref_resolves_to_object(iter->iter0->refname, | |
712 | iter->iter0->oid, | |
713 | iter->iter0->flags)) | |
714 | continue; | |
715 | ||
716 | iter->base.refname = iter->iter0->refname; | |
717 | iter->base.oid = iter->iter0->oid; | |
718 | iter->base.flags = iter->iter0->flags; | |
719 | return ITER_OK; | |
7bd9bcf3 MH |
720 | } |
721 | ||
3bc581b9 MH |
722 | iter->iter0 = NULL; |
723 | if (ref_iterator_abort(ref_iterator) != ITER_DONE) | |
724 | ok = ITER_ERROR; | |
725 | ||
726 | return ok; | |
7bd9bcf3 MH |
727 | } |
728 | ||
3bc581b9 MH |
729 | static int files_ref_iterator_peel(struct ref_iterator *ref_iterator, |
730 | struct object_id *peeled) | |
7bd9bcf3 | 731 | { |
3bc581b9 MH |
732 | struct files_ref_iterator *iter = |
733 | (struct files_ref_iterator *)ref_iterator; | |
93770590 | 734 | |
3bc581b9 MH |
735 | return ref_iterator_peel(iter->iter0, peeled); |
736 | } | |
737 | ||
738 | static int files_ref_iterator_abort(struct ref_iterator *ref_iterator) | |
739 | { | |
740 | struct files_ref_iterator *iter = | |
741 | (struct files_ref_iterator *)ref_iterator; | |
742 | int ok = ITER_DONE; | |
743 | ||
744 | if (iter->iter0) | |
745 | ok = ref_iterator_abort(iter->iter0); | |
746 | ||
3bc581b9 MH |
747 | base_ref_iterator_free(ref_iterator); |
748 | return ok; | |
749 | } | |
750 | ||
751 | static struct ref_iterator_vtable files_ref_iterator_vtable = { | |
752 | files_ref_iterator_advance, | |
753 | files_ref_iterator_peel, | |
754 | files_ref_iterator_abort | |
755 | }; | |
756 | ||
1a769003 | 757 | static struct ref_iterator *files_ref_iterator_begin( |
37b6f6d5 | 758 | struct ref_store *ref_store, |
3bc581b9 MH |
759 | const char *prefix, unsigned int flags) |
760 | { | |
9e7ec634 | 761 | struct files_ref_store *refs; |
3bc581b9 MH |
762 | struct ref_iterator *loose_iter, *packed_iter; |
763 | struct files_ref_iterator *iter; | |
764 | struct ref_iterator *ref_iterator; | |
0a0865b8 | 765 | unsigned int required_flags = REF_STORE_READ; |
3bc581b9 | 766 | |
0a0865b8 MH |
767 | if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) |
768 | required_flags |= REF_STORE_ODB; | |
3bc581b9 | 769 | |
0a0865b8 | 770 | refs = files_downcast(ref_store, required_flags, "ref_iterator_begin"); |
9e7ec634 | 771 | |
3bc581b9 MH |
772 | iter = xcalloc(1, sizeof(*iter)); |
773 | ref_iterator = &iter->base; | |
774 | base_ref_iterator_init(ref_iterator, &files_ref_iterator_vtable); | |
775 | ||
776 | /* | |
777 | * We must make sure that all loose refs are read before | |
778 | * accessing the packed-refs file; this avoids a race | |
779 | * condition if loose refs are migrated to the packed-refs | |
780 | * file by a simultaneous process, but our in-memory view is | |
781 | * from before the migration. We ensure this as follows: | |
059ae35a MH |
782 | * First, we call start the loose refs iteration with its |
783 | * `prime_ref` argument set to true. This causes the loose | |
784 | * references in the subtree to be pre-read into the cache. | |
785 | * (If they've already been read, that's OK; we only need to | |
786 | * guarantee that they're read before the packed refs, not | |
787 | * *how much* before.) After that, we call | |
38b86e81 MH |
788 | * packed_ref_iterator_begin(), which internally checks |
789 | * whether the packed-ref cache is up to date with what is on | |
790 | * disk, and re-reads it if not. | |
3bc581b9 MH |
791 | */ |
792 | ||
059ae35a MH |
793 | loose_iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), |
794 | prefix, 1); | |
3bc581b9 | 795 | |
38b86e81 MH |
796 | /* |
797 | * The packed-refs file might contain broken references, for | |
798 | * example an old version of a reference that points at an | |
799 | * object that has since been garbage-collected. This is OK as | |
800 | * long as there is a corresponding loose reference that | |
801 | * overrides it, and we don't want to emit an error message in | |
802 | * this case. So ask the packed_ref_store for all of its | |
803 | * references, and (if needed) do our own check for broken | |
804 | * ones in files_ref_iterator_advance(), after we have merged | |
805 | * the packed and loose references. | |
806 | */ | |
e0cc8ac8 MH |
807 | packed_iter = refs_ref_iterator_begin( |
808 | refs->packed_ref_store, prefix, 0, | |
38b86e81 | 809 | DO_FOR_EACH_INCLUDE_BROKEN); |
3bc581b9 MH |
810 | |
811 | iter->iter0 = overlay_ref_iterator_begin(loose_iter, packed_iter); | |
812 | iter->flags = flags; | |
813 | ||
814 | return ref_iterator; | |
7bd9bcf3 MH |
815 | } |
816 | ||
7bd9bcf3 MH |
817 | /* |
818 | * Verify that the reference locked by lock has the value old_sha1. | |
819 | * Fail if the reference doesn't exist and mustexist is set. Return 0 | |
820 | * on success. On error, write an error message to err, set errno, and | |
821 | * return a negative value. | |
822 | */ | |
2f40e954 | 823 | static int verify_lock(struct ref_store *ref_store, struct ref_lock *lock, |
7bd9bcf3 MH |
824 | const unsigned char *old_sha1, int mustexist, |
825 | struct strbuf *err) | |
826 | { | |
827 | assert(err); | |
828 | ||
2f40e954 NTND |
829 | if (refs_read_ref_full(ref_store, lock->ref_name, |
830 | mustexist ? RESOLVE_REF_READING : 0, | |
831 | lock->old_oid.hash, NULL)) { | |
6294dcb4 JK |
832 | if (old_sha1) { |
833 | int save_errno = errno; | |
0568c8e9 | 834 | strbuf_addf(err, "can't verify ref '%s'", lock->ref_name); |
6294dcb4 JK |
835 | errno = save_errno; |
836 | return -1; | |
837 | } else { | |
c368dde9 | 838 | oidclr(&lock->old_oid); |
6294dcb4 JK |
839 | return 0; |
840 | } | |
7bd9bcf3 | 841 | } |
6294dcb4 | 842 | if (old_sha1 && hashcmp(lock->old_oid.hash, old_sha1)) { |
0568c8e9 | 843 | strbuf_addf(err, "ref '%s' is at %s but expected %s", |
7bd9bcf3 | 844 | lock->ref_name, |
c368dde9 | 845 | oid_to_hex(&lock->old_oid), |
7bd9bcf3 MH |
846 | sha1_to_hex(old_sha1)); |
847 | errno = EBUSY; | |
848 | return -1; | |
849 | } | |
850 | return 0; | |
851 | } | |
852 | ||
853 | static int remove_empty_directories(struct strbuf *path) | |
854 | { | |
855 | /* | |
856 | * we want to create a file but there is a directory there; | |
857 | * if that is an empty directory (or a directory that contains | |
858 | * only empty directories), remove them. | |
859 | */ | |
860 | return remove_dir_recursively(path, REMOVE_DIR_EMPTY_ONLY); | |
861 | } | |
862 | ||
3b5d3c98 MH |
863 | static int create_reflock(const char *path, void *cb) |
864 | { | |
865 | struct lock_file *lk = cb; | |
866 | ||
867 | return hold_lock_file_for_update(lk, path, LOCK_NO_DEREF) < 0 ? -1 : 0; | |
868 | } | |
869 | ||
7bd9bcf3 MH |
870 | /* |
871 | * Locks a ref returning the lock on success and NULL on failure. | |
872 | * On failure errno is set to something meaningful. | |
873 | */ | |
7eb27cdf MH |
874 | static struct ref_lock *lock_ref_sha1_basic(struct files_ref_store *refs, |
875 | const char *refname, | |
7bd9bcf3 MH |
876 | const unsigned char *old_sha1, |
877 | const struct string_list *extras, | |
878 | const struct string_list *skip, | |
bcb497d0 | 879 | unsigned int flags, int *type, |
7bd9bcf3 MH |
880 | struct strbuf *err) |
881 | { | |
882 | struct strbuf ref_file = STRBUF_INIT; | |
7bd9bcf3 MH |
883 | struct ref_lock *lock; |
884 | int last_errno = 0; | |
7bd9bcf3 | 885 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
7a418f3a | 886 | int resolve_flags = RESOLVE_REF_NO_RECURSE; |
7a418f3a | 887 | int resolved; |
7bd9bcf3 | 888 | |
32c597e7 | 889 | files_assert_main_repository(refs, "lock_ref_sha1_basic"); |
7bd9bcf3 MH |
890 | assert(err); |
891 | ||
892 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
893 | ||
894 | if (mustexist) | |
895 | resolve_flags |= RESOLVE_REF_READING; | |
2859dcd4 | 896 | if (flags & REF_DELETING) |
7bd9bcf3 | 897 | resolve_flags |= RESOLVE_REF_ALLOW_BAD_NAME; |
7bd9bcf3 | 898 | |
19e02f4f | 899 | files_ref_path(refs, &ref_file, refname); |
2f40e954 NTND |
900 | resolved = !!refs_resolve_ref_unsafe(&refs->base, |
901 | refname, resolve_flags, | |
902 | lock->old_oid.hash, type); | |
7a418f3a | 903 | if (!resolved && errno == EISDIR) { |
7bd9bcf3 MH |
904 | /* |
905 | * we are trying to lock foo but we used to | |
906 | * have foo/bar which now does not exist; | |
907 | * it is normal for the empty directory 'foo' | |
908 | * to remain. | |
909 | */ | |
7a418f3a | 910 | if (remove_empty_directories(&ref_file)) { |
7bd9bcf3 | 911 | last_errno = errno; |
b05855b5 MH |
912 | if (!refs_verify_refname_available( |
913 | &refs->base, | |
914 | refname, extras, skip, err)) | |
7bd9bcf3 | 915 | strbuf_addf(err, "there are still refs under '%s'", |
7a418f3a | 916 | refname); |
7bd9bcf3 MH |
917 | goto error_return; |
918 | } | |
2f40e954 NTND |
919 | resolved = !!refs_resolve_ref_unsafe(&refs->base, |
920 | refname, resolve_flags, | |
921 | lock->old_oid.hash, type); | |
7bd9bcf3 | 922 | } |
7a418f3a | 923 | if (!resolved) { |
7bd9bcf3 MH |
924 | last_errno = errno; |
925 | if (last_errno != ENOTDIR || | |
b05855b5 MH |
926 | !refs_verify_refname_available(&refs->base, refname, |
927 | extras, skip, err)) | |
0568c8e9 | 928 | strbuf_addf(err, "unable to resolve reference '%s': %s", |
7a418f3a | 929 | refname, strerror(last_errno)); |
7bd9bcf3 MH |
930 | |
931 | goto error_return; | |
932 | } | |
2859dcd4 | 933 | |
7bd9bcf3 MH |
934 | /* |
935 | * If the ref did not exist and we are creating it, make sure | |
936 | * there is no existing packed ref whose name begins with our | |
937 | * refname, nor a packed ref whose name is a proper prefix of | |
938 | * our refname. | |
939 | */ | |
940 | if (is_null_oid(&lock->old_oid) && | |
524a9fdb MH |
941 | refs_verify_refname_available(&refs->base, refname, |
942 | extras, skip, err)) { | |
7bd9bcf3 MH |
943 | last_errno = ENOTDIR; |
944 | goto error_return; | |
945 | } | |
946 | ||
947 | lock->lk = xcalloc(1, sizeof(struct lock_file)); | |
948 | ||
7bd9bcf3 | 949 | lock->ref_name = xstrdup(refname); |
7bd9bcf3 | 950 | |
3b5d3c98 | 951 | if (raceproof_create_file(ref_file.buf, create_reflock, lock->lk)) { |
7bd9bcf3 | 952 | last_errno = errno; |
3b5d3c98 | 953 | unable_to_lock_message(ref_file.buf, errno, err); |
7bd9bcf3 MH |
954 | goto error_return; |
955 | } | |
956 | ||
2f40e954 | 957 | if (verify_lock(&refs->base, lock, old_sha1, mustexist, err)) { |
7bd9bcf3 MH |
958 | last_errno = errno; |
959 | goto error_return; | |
960 | } | |
961 | goto out; | |
962 | ||
963 | error_return: | |
964 | unlock_ref(lock); | |
965 | lock = NULL; | |
966 | ||
967 | out: | |
968 | strbuf_release(&ref_file); | |
7bd9bcf3 MH |
969 | errno = last_errno; |
970 | return lock; | |
971 | } | |
972 | ||
7bd9bcf3 MH |
973 | struct ref_to_prune { |
974 | struct ref_to_prune *next; | |
975 | unsigned char sha1[20]; | |
976 | char name[FLEX_ARRAY]; | |
977 | }; | |
978 | ||
a8f0db2d MH |
979 | enum { |
980 | REMOVE_EMPTY_PARENTS_REF = 0x01, | |
981 | REMOVE_EMPTY_PARENTS_REFLOG = 0x02 | |
982 | }; | |
983 | ||
7bd9bcf3 | 984 | /* |
a8f0db2d MH |
985 | * Remove empty parent directories associated with the specified |
986 | * reference and/or its reflog, but spare [logs/]refs/ and immediate | |
987 | * subdirs. flags is a combination of REMOVE_EMPTY_PARENTS_REF and/or | |
988 | * REMOVE_EMPTY_PARENTS_REFLOG. | |
7bd9bcf3 | 989 | */ |
802de3da NTND |
990 | static void try_remove_empty_parents(struct files_ref_store *refs, |
991 | const char *refname, | |
992 | unsigned int flags) | |
7bd9bcf3 | 993 | { |
8bdaecb4 | 994 | struct strbuf buf = STRBUF_INIT; |
e9dcc305 | 995 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 MH |
996 | char *p, *q; |
997 | int i; | |
8bdaecb4 MH |
998 | |
999 | strbuf_addstr(&buf, refname); | |
1000 | p = buf.buf; | |
7bd9bcf3 MH |
1001 | for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */ |
1002 | while (*p && *p != '/') | |
1003 | p++; | |
1004 | /* tolerate duplicate slashes; see check_refname_format() */ | |
1005 | while (*p == '/') | |
1006 | p++; | |
1007 | } | |
8bdaecb4 | 1008 | q = buf.buf + buf.len; |
a8f0db2d | 1009 | while (flags & (REMOVE_EMPTY_PARENTS_REF | REMOVE_EMPTY_PARENTS_REFLOG)) { |
7bd9bcf3 MH |
1010 | while (q > p && *q != '/') |
1011 | q--; | |
1012 | while (q > p && *(q-1) == '/') | |
1013 | q--; | |
1014 | if (q == p) | |
1015 | break; | |
8bdaecb4 | 1016 | strbuf_setlen(&buf, q - buf.buf); |
e9dcc305 NTND |
1017 | |
1018 | strbuf_reset(&sb); | |
19e02f4f | 1019 | files_ref_path(refs, &sb, buf.buf); |
e9dcc305 | 1020 | if ((flags & REMOVE_EMPTY_PARENTS_REF) && rmdir(sb.buf)) |
a8f0db2d | 1021 | flags &= ~REMOVE_EMPTY_PARENTS_REF; |
e9dcc305 NTND |
1022 | |
1023 | strbuf_reset(&sb); | |
802de3da | 1024 | files_reflog_path(refs, &sb, buf.buf); |
e9dcc305 | 1025 | if ((flags & REMOVE_EMPTY_PARENTS_REFLOG) && rmdir(sb.buf)) |
a8f0db2d | 1026 | flags &= ~REMOVE_EMPTY_PARENTS_REFLOG; |
7bd9bcf3 | 1027 | } |
8bdaecb4 | 1028 | strbuf_release(&buf); |
e9dcc305 | 1029 | strbuf_release(&sb); |
7bd9bcf3 MH |
1030 | } |
1031 | ||
1032 | /* make sure nobody touched the ref, and unlink */ | |
2f40e954 | 1033 | static void prune_ref(struct files_ref_store *refs, struct ref_to_prune *r) |
7bd9bcf3 MH |
1034 | { |
1035 | struct ref_transaction *transaction; | |
1036 | struct strbuf err = STRBUF_INIT; | |
1037 | ||
1038 | if (check_refname_format(r->name, 0)) | |
1039 | return; | |
1040 | ||
2f40e954 | 1041 | transaction = ref_store_transaction_begin(&refs->base, &err); |
7bd9bcf3 MH |
1042 | if (!transaction || |
1043 | ref_transaction_delete(transaction, r->name, r->sha1, | |
c52ce248 | 1044 | REF_ISPRUNING | REF_NODEREF, NULL, &err) || |
7bd9bcf3 MH |
1045 | ref_transaction_commit(transaction, &err)) { |
1046 | ref_transaction_free(transaction); | |
1047 | error("%s", err.buf); | |
1048 | strbuf_release(&err); | |
1049 | return; | |
1050 | } | |
1051 | ref_transaction_free(transaction); | |
1052 | strbuf_release(&err); | |
7bd9bcf3 MH |
1053 | } |
1054 | ||
2f40e954 | 1055 | static void prune_refs(struct files_ref_store *refs, struct ref_to_prune *r) |
7bd9bcf3 MH |
1056 | { |
1057 | while (r) { | |
2f40e954 | 1058 | prune_ref(refs, r); |
7bd9bcf3 MH |
1059 | r = r->next; |
1060 | } | |
1061 | } | |
1062 | ||
531cc4a5 MH |
1063 | /* |
1064 | * Return true if the specified reference should be packed. | |
1065 | */ | |
1066 | static int should_pack_ref(const char *refname, | |
1067 | const struct object_id *oid, unsigned int ref_flags, | |
1068 | unsigned int pack_flags) | |
1069 | { | |
1070 | /* Do not pack per-worktree refs: */ | |
1071 | if (ref_type(refname) != REF_TYPE_NORMAL) | |
1072 | return 0; | |
1073 | ||
1074 | /* Do not pack non-tags unless PACK_REFS_ALL is set: */ | |
1075 | if (!(pack_flags & PACK_REFS_ALL) && !starts_with(refname, "refs/tags/")) | |
1076 | return 0; | |
1077 | ||
1078 | /* Do not pack symbolic refs: */ | |
1079 | if (ref_flags & REF_ISSYMREF) | |
1080 | return 0; | |
1081 | ||
1082 | /* Do not pack broken refs: */ | |
1083 | if (!ref_resolves_to_object(refname, oid, ref_flags)) | |
1084 | return 0; | |
1085 | ||
1086 | return 1; | |
1087 | } | |
1088 | ||
8231527e | 1089 | static int files_pack_refs(struct ref_store *ref_store, unsigned int flags) |
7bd9bcf3 | 1090 | { |
00eebe35 | 1091 | struct files_ref_store *refs = |
9e7ec634 NTND |
1092 | files_downcast(ref_store, REF_STORE_WRITE | REF_STORE_ODB, |
1093 | "pack_refs"); | |
50c2d855 | 1094 | struct ref_iterator *iter; |
50c2d855 MH |
1095 | int ok; |
1096 | struct ref_to_prune *refs_to_prune = NULL; | |
3478983b | 1097 | struct strbuf err = STRBUF_INIT; |
7bd9bcf3 | 1098 | |
b7de57d8 | 1099 | packed_refs_lock(refs->packed_ref_store, LOCK_DIE_ON_ERROR); |
50c2d855 MH |
1100 | |
1101 | iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), NULL, 0); | |
1102 | while ((ok = ref_iterator_advance(iter)) == ITER_OK) { | |
1103 | /* | |
1104 | * If the loose reference can be packed, add an entry | |
1105 | * in the packed ref cache. If the reference should be | |
1106 | * pruned, also add it to refs_to_prune. | |
1107 | */ | |
531cc4a5 MH |
1108 | if (!should_pack_ref(iter->refname, iter->oid, iter->flags, |
1109 | flags)) | |
50c2d855 MH |
1110 | continue; |
1111 | ||
1112 | /* | |
1113 | * Create an entry in the packed-refs cache equivalent | |
1114 | * to the one from the loose ref cache, except that | |
1115 | * we don't copy the peeled status, because we want it | |
1116 | * to be re-peeled. | |
1117 | */ | |
e70b7029 | 1118 | add_packed_ref(refs->packed_ref_store, iter->refname, iter->oid); |
50c2d855 MH |
1119 | |
1120 | /* Schedule the loose reference for pruning if requested. */ | |
1121 | if ((flags & PACK_REFS_PRUNE)) { | |
1122 | struct ref_to_prune *n; | |
1123 | FLEX_ALLOC_STR(n, name, iter->refname); | |
1124 | hashcpy(n->sha1, iter->oid->hash); | |
1125 | n->next = refs_to_prune; | |
1126 | refs_to_prune = n; | |
1127 | } | |
1128 | } | |
1129 | if (ok != ITER_DONE) | |
1130 | die("error while iterating over references"); | |
7bd9bcf3 | 1131 | |
3478983b MH |
1132 | if (commit_packed_refs(refs->packed_ref_store, &err)) |
1133 | die("unable to overwrite old ref-pack file: %s", err.buf); | |
7bd9bcf3 | 1134 | |
50c2d855 | 1135 | prune_refs(refs, refs_to_prune); |
3478983b | 1136 | strbuf_release(&err); |
7bd9bcf3 MH |
1137 | return 0; |
1138 | } | |
1139 | ||
64da4199 | 1140 | static int files_delete_refs(struct ref_store *ref_store, const char *msg, |
a27dcf89 | 1141 | struct string_list *refnames, unsigned int flags) |
7bd9bcf3 | 1142 | { |
0a95ac5f | 1143 | struct files_ref_store *refs = |
9e7ec634 | 1144 | files_downcast(ref_store, REF_STORE_WRITE, "delete_refs"); |
7bd9bcf3 MH |
1145 | struct strbuf err = STRBUF_INIT; |
1146 | int i, result = 0; | |
1147 | ||
1148 | if (!refnames->nr) | |
1149 | return 0; | |
1150 | ||
0f199b1e | 1151 | result = repack_without_refs(refs->packed_ref_store, refnames, &err); |
7bd9bcf3 MH |
1152 | if (result) { |
1153 | /* | |
1154 | * If we failed to rewrite the packed-refs file, then | |
1155 | * it is unsafe to try to remove loose refs, because | |
1156 | * doing so might expose an obsolete packed value for | |
1157 | * a reference that might even point at an object that | |
1158 | * has been garbage collected. | |
1159 | */ | |
1160 | if (refnames->nr == 1) | |
1161 | error(_("could not delete reference %s: %s"), | |
1162 | refnames->items[0].string, err.buf); | |
1163 | else | |
1164 | error(_("could not delete references: %s"), err.buf); | |
1165 | ||
1166 | goto out; | |
1167 | } | |
1168 | ||
1169 | for (i = 0; i < refnames->nr; i++) { | |
1170 | const char *refname = refnames->items[i].string; | |
1171 | ||
64da4199 | 1172 | if (refs_delete_ref(&refs->base, msg, refname, NULL, flags)) |
7bd9bcf3 MH |
1173 | result |= error(_("could not remove reference %s"), refname); |
1174 | } | |
1175 | ||
1176 | out: | |
1177 | strbuf_release(&err); | |
1178 | return result; | |
1179 | } | |
1180 | ||
1181 | /* | |
1182 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
1183 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
1184 | * | |
1185 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
1186 | * live into logs/refs. | |
1187 | */ | |
a5c1efd6 | 1188 | #define TMP_RENAMED_LOG "refs/.tmp-renamed-log" |
7bd9bcf3 | 1189 | |
e9dcc305 NTND |
1190 | struct rename_cb { |
1191 | const char *tmp_renamed_log; | |
1192 | int true_errno; | |
1193 | }; | |
1194 | ||
1195 | static int rename_tmp_log_callback(const char *path, void *cb_data) | |
7bd9bcf3 | 1196 | { |
e9dcc305 | 1197 | struct rename_cb *cb = cb_data; |
7bd9bcf3 | 1198 | |
e9dcc305 | 1199 | if (rename(cb->tmp_renamed_log, path)) { |
6a7f3631 MH |
1200 | /* |
1201 | * rename(a, b) when b is an existing directory ought | |
1202 | * to result in ISDIR, but Solaris 5.8 gives ENOTDIR. | |
1203 | * Sheesh. Record the true errno for error reporting, | |
1204 | * but report EISDIR to raceproof_create_file() so | |
1205 | * that it knows to retry. | |
1206 | */ | |
e9dcc305 | 1207 | cb->true_errno = errno; |
6a7f3631 MH |
1208 | if (errno == ENOTDIR) |
1209 | errno = EISDIR; | |
1210 | return -1; | |
1211 | } else { | |
1212 | return 0; | |
7bd9bcf3 | 1213 | } |
6a7f3631 | 1214 | } |
7bd9bcf3 | 1215 | |
802de3da | 1216 | static int rename_tmp_log(struct files_ref_store *refs, const char *newrefname) |
6a7f3631 | 1217 | { |
e9dcc305 NTND |
1218 | struct strbuf path = STRBUF_INIT; |
1219 | struct strbuf tmp = STRBUF_INIT; | |
1220 | struct rename_cb cb; | |
1221 | int ret; | |
6a7f3631 | 1222 | |
802de3da NTND |
1223 | files_reflog_path(refs, &path, newrefname); |
1224 | files_reflog_path(refs, &tmp, TMP_RENAMED_LOG); | |
e9dcc305 NTND |
1225 | cb.tmp_renamed_log = tmp.buf; |
1226 | ret = raceproof_create_file(path.buf, rename_tmp_log_callback, &cb); | |
6a7f3631 MH |
1227 | if (ret) { |
1228 | if (errno == EISDIR) | |
e9dcc305 | 1229 | error("directory not empty: %s", path.buf); |
6a7f3631 | 1230 | else |
990c98d2 | 1231 | error("unable to move logfile %s to %s: %s", |
e9dcc305 NTND |
1232 | tmp.buf, path.buf, |
1233 | strerror(cb.true_errno)); | |
7bd9bcf3 | 1234 | } |
6a7f3631 | 1235 | |
e9dcc305 NTND |
1236 | strbuf_release(&path); |
1237 | strbuf_release(&tmp); | |
7bd9bcf3 MH |
1238 | return ret; |
1239 | } | |
1240 | ||
7bd9bcf3 | 1241 | static int write_ref_to_lockfile(struct ref_lock *lock, |
4417df8c | 1242 | const struct object_id *oid, struct strbuf *err); |
f18a7892 MH |
1243 | static int commit_ref_update(struct files_ref_store *refs, |
1244 | struct ref_lock *lock, | |
4417df8c | 1245 | const struct object_id *oid, const char *logmsg, |
5d9b2de4 | 1246 | struct strbuf *err); |
7bd9bcf3 | 1247 | |
9b6b40d9 DT |
1248 | static int files_rename_ref(struct ref_store *ref_store, |
1249 | const char *oldrefname, const char *newrefname, | |
1250 | const char *logmsg) | |
7bd9bcf3 | 1251 | { |
9b6b40d9 | 1252 | struct files_ref_store *refs = |
9e7ec634 | 1253 | files_downcast(ref_store, REF_STORE_WRITE, "rename_ref"); |
4417df8c | 1254 | struct object_id oid, orig_oid; |
7bd9bcf3 MH |
1255 | int flag = 0, logmoved = 0; |
1256 | struct ref_lock *lock; | |
1257 | struct stat loginfo; | |
e9dcc305 NTND |
1258 | struct strbuf sb_oldref = STRBUF_INIT; |
1259 | struct strbuf sb_newref = STRBUF_INIT; | |
1260 | struct strbuf tmp_renamed_log = STRBUF_INIT; | |
1261 | int log, ret; | |
7bd9bcf3 MH |
1262 | struct strbuf err = STRBUF_INIT; |
1263 | ||
802de3da NTND |
1264 | files_reflog_path(refs, &sb_oldref, oldrefname); |
1265 | files_reflog_path(refs, &sb_newref, newrefname); | |
1266 | files_reflog_path(refs, &tmp_renamed_log, TMP_RENAMED_LOG); | |
e9dcc305 NTND |
1267 | |
1268 | log = !lstat(sb_oldref.buf, &loginfo); | |
0a3f07d6 NTND |
1269 | if (log && S_ISLNK(loginfo.st_mode)) { |
1270 | ret = error("reflog for %s is a symlink", oldrefname); | |
1271 | goto out; | |
1272 | } | |
7bd9bcf3 | 1273 | |
2f40e954 NTND |
1274 | if (!refs_resolve_ref_unsafe(&refs->base, oldrefname, |
1275 | RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE, | |
4417df8c | 1276 | orig_oid.hash, &flag)) { |
0a3f07d6 NTND |
1277 | ret = error("refname %s not found", oldrefname); |
1278 | goto out; | |
1279 | } | |
e711b1af | 1280 | |
0a3f07d6 NTND |
1281 | if (flag & REF_ISSYMREF) { |
1282 | ret = error("refname %s is a symbolic ref, renaming it is not supported", | |
1283 | oldrefname); | |
1284 | goto out; | |
1285 | } | |
7d2df051 | 1286 | if (!refs_rename_ref_available(&refs->base, oldrefname, newrefname)) { |
0a3f07d6 NTND |
1287 | ret = 1; |
1288 | goto out; | |
1289 | } | |
7bd9bcf3 | 1290 | |
e9dcc305 | 1291 | if (log && rename(sb_oldref.buf, tmp_renamed_log.buf)) { |
a5c1efd6 | 1292 | ret = error("unable to move logfile logs/%s to logs/"TMP_RENAMED_LOG": %s", |
0a3f07d6 NTND |
1293 | oldrefname, strerror(errno)); |
1294 | goto out; | |
1295 | } | |
7bd9bcf3 | 1296 | |
2f40e954 | 1297 | if (refs_delete_ref(&refs->base, logmsg, oldrefname, |
4417df8c | 1298 | orig_oid.hash, REF_NODEREF)) { |
7bd9bcf3 MH |
1299 | error("unable to delete old %s", oldrefname); |
1300 | goto rollback; | |
1301 | } | |
1302 | ||
12fd3496 | 1303 | /* |
4417df8c | 1304 | * Since we are doing a shallow lookup, oid is not the |
1305 | * correct value to pass to delete_ref as old_oid. But that | |
1306 | * doesn't matter, because an old_oid check wouldn't add to | |
12fd3496 DT |
1307 | * the safety anyway; we want to delete the reference whatever |
1308 | * its current value. | |
1309 | */ | |
2f40e954 NTND |
1310 | if (!refs_read_ref_full(&refs->base, newrefname, |
1311 | RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE, | |
4417df8c | 1312 | oid.hash, NULL) && |
2f40e954 NTND |
1313 | refs_delete_ref(&refs->base, NULL, newrefname, |
1314 | NULL, REF_NODEREF)) { | |
58364324 | 1315 | if (errno == EISDIR) { |
7bd9bcf3 MH |
1316 | struct strbuf path = STRBUF_INIT; |
1317 | int result; | |
1318 | ||
19e02f4f | 1319 | files_ref_path(refs, &path, newrefname); |
7bd9bcf3 MH |
1320 | result = remove_empty_directories(&path); |
1321 | strbuf_release(&path); | |
1322 | ||
1323 | if (result) { | |
1324 | error("Directory not empty: %s", newrefname); | |
1325 | goto rollback; | |
1326 | } | |
1327 | } else { | |
1328 | error("unable to delete existing %s", newrefname); | |
1329 | goto rollback; | |
1330 | } | |
1331 | } | |
1332 | ||
802de3da | 1333 | if (log && rename_tmp_log(refs, newrefname)) |
7bd9bcf3 MH |
1334 | goto rollback; |
1335 | ||
1336 | logmoved = log; | |
1337 | ||
7eb27cdf MH |
1338 | lock = lock_ref_sha1_basic(refs, newrefname, NULL, NULL, NULL, |
1339 | REF_NODEREF, NULL, &err); | |
7bd9bcf3 MH |
1340 | if (!lock) { |
1341 | error("unable to rename '%s' to '%s': %s", oldrefname, newrefname, err.buf); | |
1342 | strbuf_release(&err); | |
1343 | goto rollback; | |
1344 | } | |
4417df8c | 1345 | oidcpy(&lock->old_oid, &orig_oid); |
7bd9bcf3 | 1346 | |
4417df8c | 1347 | if (write_ref_to_lockfile(lock, &orig_oid, &err) || |
1348 | commit_ref_update(refs, lock, &orig_oid, logmsg, &err)) { | |
7bd9bcf3 MH |
1349 | error("unable to write current sha1 into %s: %s", newrefname, err.buf); |
1350 | strbuf_release(&err); | |
1351 | goto rollback; | |
1352 | } | |
1353 | ||
0a3f07d6 NTND |
1354 | ret = 0; |
1355 | goto out; | |
7bd9bcf3 MH |
1356 | |
1357 | rollback: | |
7eb27cdf MH |
1358 | lock = lock_ref_sha1_basic(refs, oldrefname, NULL, NULL, NULL, |
1359 | REF_NODEREF, NULL, &err); | |
7bd9bcf3 MH |
1360 | if (!lock) { |
1361 | error("unable to lock %s for rollback: %s", oldrefname, err.buf); | |
1362 | strbuf_release(&err); | |
1363 | goto rollbacklog; | |
1364 | } | |
1365 | ||
1366 | flag = log_all_ref_updates; | |
341fb286 | 1367 | log_all_ref_updates = LOG_REFS_NONE; |
4417df8c | 1368 | if (write_ref_to_lockfile(lock, &orig_oid, &err) || |
1369 | commit_ref_update(refs, lock, &orig_oid, NULL, &err)) { | |
7bd9bcf3 MH |
1370 | error("unable to write current sha1 into %s: %s", oldrefname, err.buf); |
1371 | strbuf_release(&err); | |
1372 | } | |
1373 | log_all_ref_updates = flag; | |
1374 | ||
1375 | rollbacklog: | |
e9dcc305 | 1376 | if (logmoved && rename(sb_newref.buf, sb_oldref.buf)) |
7bd9bcf3 MH |
1377 | error("unable to restore logfile %s from %s: %s", |
1378 | oldrefname, newrefname, strerror(errno)); | |
1379 | if (!logmoved && log && | |
e9dcc305 | 1380 | rename(tmp_renamed_log.buf, sb_oldref.buf)) |
a5c1efd6 | 1381 | error("unable to restore logfile %s from logs/"TMP_RENAMED_LOG": %s", |
7bd9bcf3 | 1382 | oldrefname, strerror(errno)); |
0a3f07d6 NTND |
1383 | ret = 1; |
1384 | out: | |
e9dcc305 NTND |
1385 | strbuf_release(&sb_newref); |
1386 | strbuf_release(&sb_oldref); | |
1387 | strbuf_release(&tmp_renamed_log); | |
1388 | ||
0a3f07d6 | 1389 | return ret; |
7bd9bcf3 MH |
1390 | } |
1391 | ||
1392 | static int close_ref(struct ref_lock *lock) | |
1393 | { | |
1394 | if (close_lock_file(lock->lk)) | |
1395 | return -1; | |
1396 | return 0; | |
1397 | } | |
1398 | ||
1399 | static int commit_ref(struct ref_lock *lock) | |
1400 | { | |
5387c0d8 MH |
1401 | char *path = get_locked_file_path(lock->lk); |
1402 | struct stat st; | |
1403 | ||
1404 | if (!lstat(path, &st) && S_ISDIR(st.st_mode)) { | |
1405 | /* | |
1406 | * There is a directory at the path we want to rename | |
1407 | * the lockfile to. Hopefully it is empty; try to | |
1408 | * delete it. | |
1409 | */ | |
1410 | size_t len = strlen(path); | |
1411 | struct strbuf sb_path = STRBUF_INIT; | |
1412 | ||
1413 | strbuf_attach(&sb_path, path, len, len); | |
1414 | ||
1415 | /* | |
1416 | * If this fails, commit_lock_file() will also fail | |
1417 | * and will report the problem. | |
1418 | */ | |
1419 | remove_empty_directories(&sb_path); | |
1420 | strbuf_release(&sb_path); | |
1421 | } else { | |
1422 | free(path); | |
1423 | } | |
1424 | ||
7bd9bcf3 MH |
1425 | if (commit_lock_file(lock->lk)) |
1426 | return -1; | |
1427 | return 0; | |
1428 | } | |
1429 | ||
1fb0c809 MH |
1430 | static int open_or_create_logfile(const char *path, void *cb) |
1431 | { | |
1432 | int *fd = cb; | |
1433 | ||
1434 | *fd = open(path, O_APPEND | O_WRONLY | O_CREAT, 0666); | |
1435 | return (*fd < 0) ? -1 : 0; | |
1436 | } | |
1437 | ||
7bd9bcf3 | 1438 | /* |
4533e534 MH |
1439 | * Create a reflog for a ref. If force_create = 0, only create the |
1440 | * reflog for certain refs (those for which should_autocreate_reflog | |
1441 | * returns non-zero). Otherwise, create it regardless of the reference | |
1442 | * name. If the logfile already existed or was created, return 0 and | |
1443 | * set *logfd to the file descriptor opened for appending to the file. | |
1444 | * If no logfile exists and we decided not to create one, return 0 and | |
1445 | * set *logfd to -1. On failure, fill in *err, set *logfd to -1, and | |
1446 | * return -1. | |
7bd9bcf3 | 1447 | */ |
802de3da NTND |
1448 | static int log_ref_setup(struct files_ref_store *refs, |
1449 | const char *refname, int force_create, | |
4533e534 | 1450 | int *logfd, struct strbuf *err) |
7bd9bcf3 | 1451 | { |
802de3da NTND |
1452 | struct strbuf logfile_sb = STRBUF_INIT; |
1453 | char *logfile; | |
1454 | ||
1455 | files_reflog_path(refs, &logfile_sb, refname); | |
1456 | logfile = strbuf_detach(&logfile_sb, NULL); | |
7bd9bcf3 | 1457 | |
7bd9bcf3 | 1458 | if (force_create || should_autocreate_reflog(refname)) { |
4533e534 | 1459 | if (raceproof_create_file(logfile, open_or_create_logfile, logfd)) { |
1fb0c809 MH |
1460 | if (errno == ENOENT) |
1461 | strbuf_addf(err, "unable to create directory for '%s': " | |
4533e534 | 1462 | "%s", logfile, strerror(errno)); |
1fb0c809 MH |
1463 | else if (errno == EISDIR) |
1464 | strbuf_addf(err, "there are still logs under '%s'", | |
4533e534 | 1465 | logfile); |
1fb0c809 | 1466 | else |
854bda6b | 1467 | strbuf_addf(err, "unable to append to '%s': %s", |
4533e534 | 1468 | logfile, strerror(errno)); |
7bd9bcf3 | 1469 | |
4533e534 | 1470 | goto error; |
7bd9bcf3 | 1471 | } |
854bda6b | 1472 | } else { |
4533e534 | 1473 | *logfd = open(logfile, O_APPEND | O_WRONLY, 0666); |
e404f459 | 1474 | if (*logfd < 0) { |
854bda6b MH |
1475 | if (errno == ENOENT || errno == EISDIR) { |
1476 | /* | |
1477 | * The logfile doesn't already exist, | |
1478 | * but that is not an error; it only | |
1479 | * means that we won't write log | |
1480 | * entries to it. | |
1481 | */ | |
1482 | ; | |
1483 | } else { | |
1484 | strbuf_addf(err, "unable to append to '%s': %s", | |
4533e534 MH |
1485 | logfile, strerror(errno)); |
1486 | goto error; | |
854bda6b | 1487 | } |
7bd9bcf3 MH |
1488 | } |
1489 | } | |
1490 | ||
e404f459 | 1491 | if (*logfd >= 0) |
4533e534 | 1492 | adjust_shared_perm(logfile); |
854bda6b | 1493 | |
4533e534 | 1494 | free(logfile); |
7bd9bcf3 | 1495 | return 0; |
7bd9bcf3 | 1496 | |
4533e534 MH |
1497 | error: |
1498 | free(logfile); | |
1499 | return -1; | |
7bd9bcf3 | 1500 | } |
7bd9bcf3 | 1501 | |
e3688bd6 DT |
1502 | static int files_create_reflog(struct ref_store *ref_store, |
1503 | const char *refname, int force_create, | |
1504 | struct strbuf *err) | |
7bd9bcf3 | 1505 | { |
802de3da | 1506 | struct files_ref_store *refs = |
9e7ec634 | 1507 | files_downcast(ref_store, REF_STORE_WRITE, "create_reflog"); |
e404f459 | 1508 | int fd; |
7bd9bcf3 | 1509 | |
802de3da | 1510 | if (log_ref_setup(refs, refname, force_create, &fd, err)) |
4533e534 MH |
1511 | return -1; |
1512 | ||
e404f459 MH |
1513 | if (fd >= 0) |
1514 | close(fd); | |
4533e534 MH |
1515 | |
1516 | return 0; | |
7bd9bcf3 MH |
1517 | } |
1518 | ||
4417df8c | 1519 | static int log_ref_write_fd(int fd, const struct object_id *old_oid, |
1520 | const struct object_id *new_oid, | |
7bd9bcf3 MH |
1521 | const char *committer, const char *msg) |
1522 | { | |
1523 | int msglen, written; | |
1524 | unsigned maxlen, len; | |
1525 | char *logrec; | |
1526 | ||
1527 | msglen = msg ? strlen(msg) : 0; | |
1528 | maxlen = strlen(committer) + msglen + 100; | |
1529 | logrec = xmalloc(maxlen); | |
1530 | len = xsnprintf(logrec, maxlen, "%s %s %s\n", | |
4417df8c | 1531 | oid_to_hex(old_oid), |
1532 | oid_to_hex(new_oid), | |
7bd9bcf3 MH |
1533 | committer); |
1534 | if (msglen) | |
1535 | len += copy_reflog_msg(logrec + len - 1, msg) - 1; | |
1536 | ||
1537 | written = len <= maxlen ? write_in_full(fd, logrec, len) : -1; | |
1538 | free(logrec); | |
1539 | if (written != len) | |
1540 | return -1; | |
1541 | ||
1542 | return 0; | |
1543 | } | |
1544 | ||
802de3da | 1545 | static int files_log_ref_write(struct files_ref_store *refs, |
4417df8c | 1546 | const char *refname, const struct object_id *old_oid, |
1547 | const struct object_id *new_oid, const char *msg, | |
11f8457f | 1548 | int flags, struct strbuf *err) |
7bd9bcf3 | 1549 | { |
e404f459 | 1550 | int logfd, result; |
7bd9bcf3 | 1551 | |
341fb286 CW |
1552 | if (log_all_ref_updates == LOG_REFS_UNSET) |
1553 | log_all_ref_updates = is_bare_repository() ? LOG_REFS_NONE : LOG_REFS_NORMAL; | |
7bd9bcf3 | 1554 | |
802de3da NTND |
1555 | result = log_ref_setup(refs, refname, |
1556 | flags & REF_FORCE_CREATE_REFLOG, | |
4533e534 | 1557 | &logfd, err); |
7bd9bcf3 MH |
1558 | |
1559 | if (result) | |
1560 | return result; | |
1561 | ||
7bd9bcf3 MH |
1562 | if (logfd < 0) |
1563 | return 0; | |
4417df8c | 1564 | result = log_ref_write_fd(logfd, old_oid, new_oid, |
7bd9bcf3 MH |
1565 | git_committer_info(0), msg); |
1566 | if (result) { | |
e9dcc305 | 1567 | struct strbuf sb = STRBUF_INIT; |
87b21e05 MH |
1568 | int save_errno = errno; |
1569 | ||
802de3da | 1570 | files_reflog_path(refs, &sb, refname); |
87b21e05 | 1571 | strbuf_addf(err, "unable to append to '%s': %s", |
e9dcc305 NTND |
1572 | sb.buf, strerror(save_errno)); |
1573 | strbuf_release(&sb); | |
7bd9bcf3 MH |
1574 | close(logfd); |
1575 | return -1; | |
1576 | } | |
1577 | if (close(logfd)) { | |
e9dcc305 | 1578 | struct strbuf sb = STRBUF_INIT; |
87b21e05 MH |
1579 | int save_errno = errno; |
1580 | ||
802de3da | 1581 | files_reflog_path(refs, &sb, refname); |
87b21e05 | 1582 | strbuf_addf(err, "unable to append to '%s': %s", |
e9dcc305 NTND |
1583 | sb.buf, strerror(save_errno)); |
1584 | strbuf_release(&sb); | |
7bd9bcf3 MH |
1585 | return -1; |
1586 | } | |
1587 | return 0; | |
1588 | } | |
1589 | ||
7bd9bcf3 MH |
1590 | /* |
1591 | * Write sha1 into the open lockfile, then close the lockfile. On | |
1592 | * errors, rollback the lockfile, fill in *err and | |
1593 | * return -1. | |
1594 | */ | |
1595 | static int write_ref_to_lockfile(struct ref_lock *lock, | |
4417df8c | 1596 | const struct object_id *oid, struct strbuf *err) |
7bd9bcf3 MH |
1597 | { |
1598 | static char term = '\n'; | |
1599 | struct object *o; | |
1600 | int fd; | |
1601 | ||
c251c83d | 1602 | o = parse_object(oid); |
7bd9bcf3 MH |
1603 | if (!o) { |
1604 | strbuf_addf(err, | |
0568c8e9 | 1605 | "trying to write ref '%s' with nonexistent object %s", |
4417df8c | 1606 | lock->ref_name, oid_to_hex(oid)); |
7bd9bcf3 MH |
1607 | unlock_ref(lock); |
1608 | return -1; | |
1609 | } | |
1610 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1611 | strbuf_addf(err, | |
0568c8e9 | 1612 | "trying to write non-commit object %s to branch '%s'", |
4417df8c | 1613 | oid_to_hex(oid), lock->ref_name); |
7bd9bcf3 MH |
1614 | unlock_ref(lock); |
1615 | return -1; | |
1616 | } | |
1617 | fd = get_lock_file_fd(lock->lk); | |
4417df8c | 1618 | if (write_in_full(fd, oid_to_hex(oid), GIT_SHA1_HEXSZ) != GIT_SHA1_HEXSZ || |
7bd9bcf3 MH |
1619 | write_in_full(fd, &term, 1) != 1 || |
1620 | close_ref(lock) < 0) { | |
1621 | strbuf_addf(err, | |
0568c8e9 | 1622 | "couldn't write '%s'", get_lock_file_path(lock->lk)); |
7bd9bcf3 MH |
1623 | unlock_ref(lock); |
1624 | return -1; | |
1625 | } | |
1626 | return 0; | |
1627 | } | |
1628 | ||
1629 | /* | |
1630 | * Commit a change to a loose reference that has already been written | |
1631 | * to the loose reference lockfile. Also update the reflogs if | |
1632 | * necessary, using the specified lockmsg (which can be NULL). | |
1633 | */ | |
f18a7892 MH |
1634 | static int commit_ref_update(struct files_ref_store *refs, |
1635 | struct ref_lock *lock, | |
4417df8c | 1636 | const struct object_id *oid, const char *logmsg, |
5d9b2de4 | 1637 | struct strbuf *err) |
7bd9bcf3 | 1638 | { |
32c597e7 | 1639 | files_assert_main_repository(refs, "commit_ref_update"); |
00eebe35 MH |
1640 | |
1641 | clear_loose_ref_cache(refs); | |
802de3da | 1642 | if (files_log_ref_write(refs, lock->ref_name, |
4417df8c | 1643 | &lock->old_oid, oid, |
81b1b6d4 | 1644 | logmsg, 0, err)) { |
7bd9bcf3 | 1645 | char *old_msg = strbuf_detach(err, NULL); |
0568c8e9 | 1646 | strbuf_addf(err, "cannot update the ref '%s': %s", |
7bd9bcf3 MH |
1647 | lock->ref_name, old_msg); |
1648 | free(old_msg); | |
1649 | unlock_ref(lock); | |
1650 | return -1; | |
1651 | } | |
7a418f3a MH |
1652 | |
1653 | if (strcmp(lock->ref_name, "HEAD") != 0) { | |
7bd9bcf3 MH |
1654 | /* |
1655 | * Special hack: If a branch is updated directly and HEAD | |
1656 | * points to it (may happen on the remote side of a push | |
1657 | * for example) then logically the HEAD reflog should be | |
1658 | * updated too. | |
1659 | * A generic solution implies reverse symref information, | |
1660 | * but finding all symrefs pointing to the given branch | |
1661 | * would be rather costly for this rare event (the direct | |
1662 | * update of a branch) to be worth it. So let's cheat and | |
1663 | * check with HEAD only which should cover 99% of all usage | |
1664 | * scenarios (even 100% of the default ones). | |
1665 | */ | |
4417df8c | 1666 | struct object_id head_oid; |
7bd9bcf3 MH |
1667 | int head_flag; |
1668 | const char *head_ref; | |
7a418f3a | 1669 | |
2f40e954 NTND |
1670 | head_ref = refs_resolve_ref_unsafe(&refs->base, "HEAD", |
1671 | RESOLVE_REF_READING, | |
4417df8c | 1672 | head_oid.hash, &head_flag); |
7bd9bcf3 MH |
1673 | if (head_ref && (head_flag & REF_ISSYMREF) && |
1674 | !strcmp(head_ref, lock->ref_name)) { | |
1675 | struct strbuf log_err = STRBUF_INIT; | |
802de3da | 1676 | if (files_log_ref_write(refs, "HEAD", |
4417df8c | 1677 | &lock->old_oid, oid, |
802de3da | 1678 | logmsg, 0, &log_err)) { |
7bd9bcf3 MH |
1679 | error("%s", log_err.buf); |
1680 | strbuf_release(&log_err); | |
1681 | } | |
1682 | } | |
1683 | } | |
7a418f3a | 1684 | |
7bd9bcf3 | 1685 | if (commit_ref(lock)) { |
0568c8e9 | 1686 | strbuf_addf(err, "couldn't set '%s'", lock->ref_name); |
7bd9bcf3 MH |
1687 | unlock_ref(lock); |
1688 | return -1; | |
1689 | } | |
1690 | ||
1691 | unlock_ref(lock); | |
1692 | return 0; | |
1693 | } | |
1694 | ||
370e5ad6 | 1695 | static int create_ref_symlink(struct ref_lock *lock, const char *target) |
7bd9bcf3 | 1696 | { |
370e5ad6 | 1697 | int ret = -1; |
7bd9bcf3 | 1698 | #ifndef NO_SYMLINK_HEAD |
370e5ad6 JK |
1699 | char *ref_path = get_locked_file_path(lock->lk); |
1700 | unlink(ref_path); | |
1701 | ret = symlink(target, ref_path); | |
1702 | free(ref_path); | |
1703 | ||
1704 | if (ret) | |
7bd9bcf3 | 1705 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
7bd9bcf3 | 1706 | #endif |
370e5ad6 JK |
1707 | return ret; |
1708 | } | |
7bd9bcf3 | 1709 | |
802de3da NTND |
1710 | static void update_symref_reflog(struct files_ref_store *refs, |
1711 | struct ref_lock *lock, const char *refname, | |
370e5ad6 JK |
1712 | const char *target, const char *logmsg) |
1713 | { | |
1714 | struct strbuf err = STRBUF_INIT; | |
4417df8c | 1715 | struct object_id new_oid; |
2f40e954 NTND |
1716 | if (logmsg && |
1717 | !refs_read_ref_full(&refs->base, target, | |
4417df8c | 1718 | RESOLVE_REF_READING, new_oid.hash, NULL) && |
1719 | files_log_ref_write(refs, refname, &lock->old_oid, | |
1720 | &new_oid, logmsg, 0, &err)) { | |
7bd9bcf3 MH |
1721 | error("%s", err.buf); |
1722 | strbuf_release(&err); | |
1723 | } | |
370e5ad6 | 1724 | } |
7bd9bcf3 | 1725 | |
802de3da NTND |
1726 | static int create_symref_locked(struct files_ref_store *refs, |
1727 | struct ref_lock *lock, const char *refname, | |
370e5ad6 JK |
1728 | const char *target, const char *logmsg) |
1729 | { | |
1730 | if (prefer_symlink_refs && !create_ref_symlink(lock, target)) { | |
802de3da | 1731 | update_symref_reflog(refs, lock, refname, target, logmsg); |
370e5ad6 JK |
1732 | return 0; |
1733 | } | |
1734 | ||
1735 | if (!fdopen_lock_file(lock->lk, "w")) | |
1736 | return error("unable to fdopen %s: %s", | |
1737 | lock->lk->tempfile.filename.buf, strerror(errno)); | |
1738 | ||
802de3da | 1739 | update_symref_reflog(refs, lock, refname, target, logmsg); |
396da8f7 | 1740 | |
370e5ad6 JK |
1741 | /* no error check; commit_ref will check ferror */ |
1742 | fprintf(lock->lk->tempfile.fp, "ref: %s\n", target); | |
1743 | if (commit_ref(lock) < 0) | |
1744 | return error("unable to write symref for %s: %s", refname, | |
1745 | strerror(errno)); | |
7bd9bcf3 MH |
1746 | return 0; |
1747 | } | |
1748 | ||
284689ba MH |
1749 | static int files_create_symref(struct ref_store *ref_store, |
1750 | const char *refname, const char *target, | |
1751 | const char *logmsg) | |
370e5ad6 | 1752 | { |
7eb27cdf | 1753 | struct files_ref_store *refs = |
9e7ec634 | 1754 | files_downcast(ref_store, REF_STORE_WRITE, "create_symref"); |
370e5ad6 JK |
1755 | struct strbuf err = STRBUF_INIT; |
1756 | struct ref_lock *lock; | |
1757 | int ret; | |
1758 | ||
7eb27cdf MH |
1759 | lock = lock_ref_sha1_basic(refs, refname, NULL, |
1760 | NULL, NULL, REF_NODEREF, NULL, | |
370e5ad6 JK |
1761 | &err); |
1762 | if (!lock) { | |
1763 | error("%s", err.buf); | |
1764 | strbuf_release(&err); | |
1765 | return -1; | |
1766 | } | |
1767 | ||
802de3da | 1768 | ret = create_symref_locked(refs, lock, refname, target, logmsg); |
370e5ad6 JK |
1769 | unlock_ref(lock); |
1770 | return ret; | |
1771 | } | |
1772 | ||
e3688bd6 DT |
1773 | static int files_reflog_exists(struct ref_store *ref_store, |
1774 | const char *refname) | |
7bd9bcf3 | 1775 | { |
802de3da | 1776 | struct files_ref_store *refs = |
9e7ec634 | 1777 | files_downcast(ref_store, REF_STORE_READ, "reflog_exists"); |
e9dcc305 | 1778 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 | 1779 | struct stat st; |
e9dcc305 | 1780 | int ret; |
7bd9bcf3 | 1781 | |
802de3da | 1782 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
1783 | ret = !lstat(sb.buf, &st) && S_ISREG(st.st_mode); |
1784 | strbuf_release(&sb); | |
1785 | return ret; | |
7bd9bcf3 MH |
1786 | } |
1787 | ||
e3688bd6 DT |
1788 | static int files_delete_reflog(struct ref_store *ref_store, |
1789 | const char *refname) | |
7bd9bcf3 | 1790 | { |
802de3da | 1791 | struct files_ref_store *refs = |
9e7ec634 | 1792 | files_downcast(ref_store, REF_STORE_WRITE, "delete_reflog"); |
e9dcc305 NTND |
1793 | struct strbuf sb = STRBUF_INIT; |
1794 | int ret; | |
1795 | ||
802de3da | 1796 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
1797 | ret = remove_path(sb.buf); |
1798 | strbuf_release(&sb); | |
1799 | return ret; | |
7bd9bcf3 MH |
1800 | } |
1801 | ||
1802 | static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data) | |
1803 | { | |
9461d272 | 1804 | struct object_id ooid, noid; |
7bd9bcf3 | 1805 | char *email_end, *message; |
dddbad72 | 1806 | timestamp_t timestamp; |
7bd9bcf3 | 1807 | int tz; |
43bc3b6c | 1808 | const char *p = sb->buf; |
7bd9bcf3 MH |
1809 | |
1810 | /* old SP new SP name <email> SP time TAB msg LF */ | |
43bc3b6c | 1811 | if (!sb->len || sb->buf[sb->len - 1] != '\n' || |
1812 | parse_oid_hex(p, &ooid, &p) || *p++ != ' ' || | |
1813 | parse_oid_hex(p, &noid, &p) || *p++ != ' ' || | |
1814 | !(email_end = strchr(p, '>')) || | |
7bd9bcf3 | 1815 | email_end[1] != ' ' || |
1aeb7e75 | 1816 | !(timestamp = parse_timestamp(email_end + 2, &message, 10)) || |
7bd9bcf3 MH |
1817 | !message || message[0] != ' ' || |
1818 | (message[1] != '+' && message[1] != '-') || | |
1819 | !isdigit(message[2]) || !isdigit(message[3]) || | |
1820 | !isdigit(message[4]) || !isdigit(message[5])) | |
1821 | return 0; /* corrupt? */ | |
1822 | email_end[1] = '\0'; | |
1823 | tz = strtol(message + 1, NULL, 10); | |
1824 | if (message[6] != '\t') | |
1825 | message += 6; | |
1826 | else | |
1827 | message += 7; | |
43bc3b6c | 1828 | return fn(&ooid, &noid, p, timestamp, tz, message, cb_data); |
7bd9bcf3 MH |
1829 | } |
1830 | ||
1831 | static char *find_beginning_of_line(char *bob, char *scan) | |
1832 | { | |
1833 | while (bob < scan && *(--scan) != '\n') | |
1834 | ; /* keep scanning backwards */ | |
1835 | /* | |
1836 | * Return either beginning of the buffer, or LF at the end of | |
1837 | * the previous line. | |
1838 | */ | |
1839 | return scan; | |
1840 | } | |
1841 | ||
e3688bd6 DT |
1842 | static int files_for_each_reflog_ent_reverse(struct ref_store *ref_store, |
1843 | const char *refname, | |
1844 | each_reflog_ent_fn fn, | |
1845 | void *cb_data) | |
7bd9bcf3 | 1846 | { |
802de3da | 1847 | struct files_ref_store *refs = |
9e7ec634 NTND |
1848 | files_downcast(ref_store, REF_STORE_READ, |
1849 | "for_each_reflog_ent_reverse"); | |
7bd9bcf3 MH |
1850 | struct strbuf sb = STRBUF_INIT; |
1851 | FILE *logfp; | |
1852 | long pos; | |
1853 | int ret = 0, at_tail = 1; | |
1854 | ||
802de3da | 1855 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
1856 | logfp = fopen(sb.buf, "r"); |
1857 | strbuf_release(&sb); | |
7bd9bcf3 MH |
1858 | if (!logfp) |
1859 | return -1; | |
1860 | ||
1861 | /* Jump to the end */ | |
1862 | if (fseek(logfp, 0, SEEK_END) < 0) | |
be686f03 RS |
1863 | ret = error("cannot seek back reflog for %s: %s", |
1864 | refname, strerror(errno)); | |
7bd9bcf3 MH |
1865 | pos = ftell(logfp); |
1866 | while (!ret && 0 < pos) { | |
1867 | int cnt; | |
1868 | size_t nread; | |
1869 | char buf[BUFSIZ]; | |
1870 | char *endp, *scanp; | |
1871 | ||
1872 | /* Fill next block from the end */ | |
1873 | cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos; | |
be686f03 RS |
1874 | if (fseek(logfp, pos - cnt, SEEK_SET)) { |
1875 | ret = error("cannot seek back reflog for %s: %s", | |
1876 | refname, strerror(errno)); | |
1877 | break; | |
1878 | } | |
7bd9bcf3 | 1879 | nread = fread(buf, cnt, 1, logfp); |
be686f03 RS |
1880 | if (nread != 1) { |
1881 | ret = error("cannot read %d bytes from reflog for %s: %s", | |
1882 | cnt, refname, strerror(errno)); | |
1883 | break; | |
1884 | } | |
7bd9bcf3 MH |
1885 | pos -= cnt; |
1886 | ||
1887 | scanp = endp = buf + cnt; | |
1888 | if (at_tail && scanp[-1] == '\n') | |
1889 | /* Looking at the final LF at the end of the file */ | |
1890 | scanp--; | |
1891 | at_tail = 0; | |
1892 | ||
1893 | while (buf < scanp) { | |
1894 | /* | |
1895 | * terminating LF of the previous line, or the beginning | |
1896 | * of the buffer. | |
1897 | */ | |
1898 | char *bp; | |
1899 | ||
1900 | bp = find_beginning_of_line(buf, scanp); | |
1901 | ||
1902 | if (*bp == '\n') { | |
1903 | /* | |
1904 | * The newline is the end of the previous line, | |
1905 | * so we know we have complete line starting | |
1906 | * at (bp + 1). Prefix it onto any prior data | |
1907 | * we collected for the line and process it. | |
1908 | */ | |
1909 | strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1)); | |
1910 | scanp = bp; | |
1911 | endp = bp + 1; | |
1912 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
1913 | strbuf_reset(&sb); | |
1914 | if (ret) | |
1915 | break; | |
1916 | } else if (!pos) { | |
1917 | /* | |
1918 | * We are at the start of the buffer, and the | |
1919 | * start of the file; there is no previous | |
1920 | * line, and we have everything for this one. | |
1921 | * Process it, and we can end the loop. | |
1922 | */ | |
1923 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
1924 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
1925 | strbuf_reset(&sb); | |
1926 | break; | |
1927 | } | |
1928 | ||
1929 | if (bp == buf) { | |
1930 | /* | |
1931 | * We are at the start of the buffer, and there | |
1932 | * is more file to read backwards. Which means | |
1933 | * we are in the middle of a line. Note that we | |
1934 | * may get here even if *bp was a newline; that | |
1935 | * just means we are at the exact end of the | |
1936 | * previous line, rather than some spot in the | |
1937 | * middle. | |
1938 | * | |
1939 | * Save away what we have to be combined with | |
1940 | * the data from the next read. | |
1941 | */ | |
1942 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
1943 | break; | |
1944 | } | |
1945 | } | |
1946 | ||
1947 | } | |
1948 | if (!ret && sb.len) | |
1949 | die("BUG: reverse reflog parser had leftover data"); | |
1950 | ||
1951 | fclose(logfp); | |
1952 | strbuf_release(&sb); | |
1953 | return ret; | |
1954 | } | |
1955 | ||
e3688bd6 DT |
1956 | static int files_for_each_reflog_ent(struct ref_store *ref_store, |
1957 | const char *refname, | |
1958 | each_reflog_ent_fn fn, void *cb_data) | |
7bd9bcf3 | 1959 | { |
802de3da | 1960 | struct files_ref_store *refs = |
9e7ec634 NTND |
1961 | files_downcast(ref_store, REF_STORE_READ, |
1962 | "for_each_reflog_ent"); | |
7bd9bcf3 MH |
1963 | FILE *logfp; |
1964 | struct strbuf sb = STRBUF_INIT; | |
1965 | int ret = 0; | |
1966 | ||
802de3da | 1967 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
1968 | logfp = fopen(sb.buf, "r"); |
1969 | strbuf_release(&sb); | |
7bd9bcf3 MH |
1970 | if (!logfp) |
1971 | return -1; | |
1972 | ||
1973 | while (!ret && !strbuf_getwholeline(&sb, logfp, '\n')) | |
1974 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
1975 | fclose(logfp); | |
1976 | strbuf_release(&sb); | |
1977 | return ret; | |
1978 | } | |
7bd9bcf3 | 1979 | |
2880d16f MH |
1980 | struct files_reflog_iterator { |
1981 | struct ref_iterator base; | |
7bd9bcf3 | 1982 | |
2f40e954 | 1983 | struct ref_store *ref_store; |
2880d16f MH |
1984 | struct dir_iterator *dir_iterator; |
1985 | struct object_id oid; | |
1986 | }; | |
7bd9bcf3 | 1987 | |
2880d16f MH |
1988 | static int files_reflog_iterator_advance(struct ref_iterator *ref_iterator) |
1989 | { | |
1990 | struct files_reflog_iterator *iter = | |
1991 | (struct files_reflog_iterator *)ref_iterator; | |
1992 | struct dir_iterator *diter = iter->dir_iterator; | |
1993 | int ok; | |
1994 | ||
1995 | while ((ok = dir_iterator_advance(diter)) == ITER_OK) { | |
1996 | int flags; | |
1997 | ||
1998 | if (!S_ISREG(diter->st.st_mode)) | |
7bd9bcf3 | 1999 | continue; |
2880d16f MH |
2000 | if (diter->basename[0] == '.') |
2001 | continue; | |
2002 | if (ends_with(diter->basename, ".lock")) | |
7bd9bcf3 | 2003 | continue; |
7bd9bcf3 | 2004 | |
2f40e954 NTND |
2005 | if (refs_read_ref_full(iter->ref_store, |
2006 | diter->relative_path, 0, | |
2007 | iter->oid.hash, &flags)) { | |
2880d16f MH |
2008 | error("bad ref for %s", diter->path.buf); |
2009 | continue; | |
7bd9bcf3 | 2010 | } |
2880d16f MH |
2011 | |
2012 | iter->base.refname = diter->relative_path; | |
2013 | iter->base.oid = &iter->oid; | |
2014 | iter->base.flags = flags; | |
2015 | return ITER_OK; | |
7bd9bcf3 | 2016 | } |
2880d16f MH |
2017 | |
2018 | iter->dir_iterator = NULL; | |
2019 | if (ref_iterator_abort(ref_iterator) == ITER_ERROR) | |
2020 | ok = ITER_ERROR; | |
2021 | return ok; | |
2022 | } | |
2023 | ||
2024 | static int files_reflog_iterator_peel(struct ref_iterator *ref_iterator, | |
2025 | struct object_id *peeled) | |
2026 | { | |
2027 | die("BUG: ref_iterator_peel() called for reflog_iterator"); | |
2028 | } | |
2029 | ||
2030 | static int files_reflog_iterator_abort(struct ref_iterator *ref_iterator) | |
2031 | { | |
2032 | struct files_reflog_iterator *iter = | |
2033 | (struct files_reflog_iterator *)ref_iterator; | |
2034 | int ok = ITER_DONE; | |
2035 | ||
2036 | if (iter->dir_iterator) | |
2037 | ok = dir_iterator_abort(iter->dir_iterator); | |
2038 | ||
2039 | base_ref_iterator_free(ref_iterator); | |
2040 | return ok; | |
2041 | } | |
2042 | ||
2043 | static struct ref_iterator_vtable files_reflog_iterator_vtable = { | |
2044 | files_reflog_iterator_advance, | |
2045 | files_reflog_iterator_peel, | |
2046 | files_reflog_iterator_abort | |
2047 | }; | |
2048 | ||
e3688bd6 | 2049 | static struct ref_iterator *files_reflog_iterator_begin(struct ref_store *ref_store) |
2880d16f | 2050 | { |
802de3da | 2051 | struct files_ref_store *refs = |
9e7ec634 NTND |
2052 | files_downcast(ref_store, REF_STORE_READ, |
2053 | "reflog_iterator_begin"); | |
2880d16f MH |
2054 | struct files_reflog_iterator *iter = xcalloc(1, sizeof(*iter)); |
2055 | struct ref_iterator *ref_iterator = &iter->base; | |
e9dcc305 | 2056 | struct strbuf sb = STRBUF_INIT; |
2880d16f MH |
2057 | |
2058 | base_ref_iterator_init(ref_iterator, &files_reflog_iterator_vtable); | |
802de3da | 2059 | files_reflog_path(refs, &sb, NULL); |
e9dcc305 | 2060 | iter->dir_iterator = dir_iterator_begin(sb.buf); |
2f40e954 | 2061 | iter->ref_store = ref_store; |
e9dcc305 | 2062 | strbuf_release(&sb); |
2880d16f | 2063 | return ref_iterator; |
7bd9bcf3 MH |
2064 | } |
2065 | ||
165056b2 | 2066 | /* |
92b1551b MH |
2067 | * If update is a direct update of head_ref (the reference pointed to |
2068 | * by HEAD), then add an extra REF_LOG_ONLY update for HEAD. | |
2069 | */ | |
2070 | static int split_head_update(struct ref_update *update, | |
2071 | struct ref_transaction *transaction, | |
2072 | const char *head_ref, | |
2073 | struct string_list *affected_refnames, | |
2074 | struct strbuf *err) | |
2075 | { | |
2076 | struct string_list_item *item; | |
2077 | struct ref_update *new_update; | |
2078 | ||
2079 | if ((update->flags & REF_LOG_ONLY) || | |
2080 | (update->flags & REF_ISPRUNING) || | |
2081 | (update->flags & REF_UPDATE_VIA_HEAD)) | |
2082 | return 0; | |
2083 | ||
2084 | if (strcmp(update->refname, head_ref)) | |
2085 | return 0; | |
2086 | ||
2087 | /* | |
2088 | * First make sure that HEAD is not already in the | |
2089 | * transaction. This insertion is O(N) in the transaction | |
2090 | * size, but it happens at most once per transaction. | |
2091 | */ | |
2092 | item = string_list_insert(affected_refnames, "HEAD"); | |
2093 | if (item->util) { | |
2094 | /* An entry already existed */ | |
2095 | strbuf_addf(err, | |
2096 | "multiple updates for 'HEAD' (including one " | |
2097 | "via its referent '%s') are not allowed", | |
2098 | update->refname); | |
2099 | return TRANSACTION_NAME_CONFLICT; | |
2100 | } | |
2101 | ||
2102 | new_update = ref_transaction_add_update( | |
2103 | transaction, "HEAD", | |
2104 | update->flags | REF_LOG_ONLY | REF_NODEREF, | |
98491298 | 2105 | update->new_oid.hash, update->old_oid.hash, |
92b1551b MH |
2106 | update->msg); |
2107 | ||
2108 | item->util = new_update; | |
2109 | ||
2110 | return 0; | |
2111 | } | |
2112 | ||
2113 | /* | |
2114 | * update is for a symref that points at referent and doesn't have | |
2115 | * REF_NODEREF set. Split it into two updates: | |
2116 | * - The original update, but with REF_LOG_ONLY and REF_NODEREF set | |
2117 | * - A new, separate update for the referent reference | |
2118 | * Note that the new update will itself be subject to splitting when | |
2119 | * the iteration gets to it. | |
2120 | */ | |
fcc42ea0 MH |
2121 | static int split_symref_update(struct files_ref_store *refs, |
2122 | struct ref_update *update, | |
92b1551b MH |
2123 | const char *referent, |
2124 | struct ref_transaction *transaction, | |
2125 | struct string_list *affected_refnames, | |
2126 | struct strbuf *err) | |
2127 | { | |
2128 | struct string_list_item *item; | |
2129 | struct ref_update *new_update; | |
2130 | unsigned int new_flags; | |
2131 | ||
2132 | /* | |
2133 | * First make sure that referent is not already in the | |
2134 | * transaction. This insertion is O(N) in the transaction | |
2135 | * size, but it happens at most once per symref in a | |
2136 | * transaction. | |
2137 | */ | |
2138 | item = string_list_insert(affected_refnames, referent); | |
2139 | if (item->util) { | |
2140 | /* An entry already existed */ | |
2141 | strbuf_addf(err, | |
2142 | "multiple updates for '%s' (including one " | |
2143 | "via symref '%s') are not allowed", | |
2144 | referent, update->refname); | |
2145 | return TRANSACTION_NAME_CONFLICT; | |
2146 | } | |
2147 | ||
2148 | new_flags = update->flags; | |
2149 | if (!strcmp(update->refname, "HEAD")) { | |
2150 | /* | |
2151 | * Record that the new update came via HEAD, so that | |
2152 | * when we process it, split_head_update() doesn't try | |
2153 | * to add another reflog update for HEAD. Note that | |
2154 | * this bit will be propagated if the new_update | |
2155 | * itself needs to be split. | |
2156 | */ | |
2157 | new_flags |= REF_UPDATE_VIA_HEAD; | |
2158 | } | |
2159 | ||
2160 | new_update = ref_transaction_add_update( | |
2161 | transaction, referent, new_flags, | |
98491298 | 2162 | update->new_oid.hash, update->old_oid.hash, |
92b1551b MH |
2163 | update->msg); |
2164 | ||
6e30b2f6 MH |
2165 | new_update->parent_update = update; |
2166 | ||
2167 | /* | |
2168 | * Change the symbolic ref update to log only. Also, it | |
2169 | * doesn't need to check its old SHA-1 value, as that will be | |
2170 | * done when new_update is processed. | |
2171 | */ | |
92b1551b | 2172 | update->flags |= REF_LOG_ONLY | REF_NODEREF; |
6e30b2f6 | 2173 | update->flags &= ~REF_HAVE_OLD; |
92b1551b MH |
2174 | |
2175 | item->util = new_update; | |
2176 | ||
2177 | return 0; | |
2178 | } | |
2179 | ||
6e30b2f6 MH |
2180 | /* |
2181 | * Return the refname under which update was originally requested. | |
2182 | */ | |
2183 | static const char *original_update_refname(struct ref_update *update) | |
2184 | { | |
2185 | while (update->parent_update) | |
2186 | update = update->parent_update; | |
2187 | ||
2188 | return update->refname; | |
2189 | } | |
2190 | ||
e3f51039 MH |
2191 | /* |
2192 | * Check whether the REF_HAVE_OLD and old_oid values stored in update | |
2193 | * are consistent with oid, which is the reference's current value. If | |
2194 | * everything is OK, return 0; otherwise, write an error message to | |
2195 | * err and return -1. | |
2196 | */ | |
2197 | static int check_old_oid(struct ref_update *update, struct object_id *oid, | |
2198 | struct strbuf *err) | |
2199 | { | |
2200 | if (!(update->flags & REF_HAVE_OLD) || | |
98491298 | 2201 | !oidcmp(oid, &update->old_oid)) |
e3f51039 MH |
2202 | return 0; |
2203 | ||
98491298 | 2204 | if (is_null_oid(&update->old_oid)) |
e3f51039 MH |
2205 | strbuf_addf(err, "cannot lock ref '%s': " |
2206 | "reference already exists", | |
2207 | original_update_refname(update)); | |
2208 | else if (is_null_oid(oid)) | |
2209 | strbuf_addf(err, "cannot lock ref '%s': " | |
2210 | "reference is missing but expected %s", | |
2211 | original_update_refname(update), | |
98491298 | 2212 | oid_to_hex(&update->old_oid)); |
e3f51039 MH |
2213 | else |
2214 | strbuf_addf(err, "cannot lock ref '%s': " | |
2215 | "is at %s but expected %s", | |
2216 | original_update_refname(update), | |
2217 | oid_to_hex(oid), | |
98491298 | 2218 | oid_to_hex(&update->old_oid)); |
e3f51039 MH |
2219 | |
2220 | return -1; | |
2221 | } | |
2222 | ||
92b1551b MH |
2223 | /* |
2224 | * Prepare for carrying out update: | |
2225 | * - Lock the reference referred to by update. | |
2226 | * - Read the reference under lock. | |
2227 | * - Check that its old SHA-1 value (if specified) is correct, and in | |
2228 | * any case record it in update->lock->old_oid for later use when | |
2229 | * writing the reflog. | |
2230 | * - If it is a symref update without REF_NODEREF, split it up into a | |
2231 | * REF_LOG_ONLY update of the symref and add a separate update for | |
2232 | * the referent to transaction. | |
2233 | * - If it is an update of head_ref, add a corresponding REF_LOG_ONLY | |
2234 | * update of HEAD. | |
165056b2 | 2235 | */ |
b3bbbc5c MH |
2236 | static int lock_ref_for_update(struct files_ref_store *refs, |
2237 | struct ref_update *update, | |
165056b2 | 2238 | struct ref_transaction *transaction, |
92b1551b | 2239 | const char *head_ref, |
165056b2 MH |
2240 | struct string_list *affected_refnames, |
2241 | struct strbuf *err) | |
2242 | { | |
92b1551b MH |
2243 | struct strbuf referent = STRBUF_INIT; |
2244 | int mustexist = (update->flags & REF_HAVE_OLD) && | |
98491298 | 2245 | !is_null_oid(&update->old_oid); |
165056b2 | 2246 | int ret; |
92b1551b | 2247 | struct ref_lock *lock; |
165056b2 | 2248 | |
32c597e7 | 2249 | files_assert_main_repository(refs, "lock_ref_for_update"); |
b3bbbc5c | 2250 | |
98491298 | 2251 | if ((update->flags & REF_HAVE_NEW) && is_null_oid(&update->new_oid)) |
165056b2 | 2252 | update->flags |= REF_DELETING; |
92b1551b MH |
2253 | |
2254 | if (head_ref) { | |
2255 | ret = split_head_update(update, transaction, head_ref, | |
2256 | affected_refnames, err); | |
2257 | if (ret) | |
2258 | return ret; | |
2259 | } | |
2260 | ||
f7b0a987 | 2261 | ret = lock_raw_ref(refs, update->refname, mustexist, |
92b1551b | 2262 | affected_refnames, NULL, |
7d618264 | 2263 | &lock, &referent, |
92b1551b | 2264 | &update->type, err); |
92b1551b | 2265 | if (ret) { |
165056b2 MH |
2266 | char *reason; |
2267 | ||
165056b2 MH |
2268 | reason = strbuf_detach(err, NULL); |
2269 | strbuf_addf(err, "cannot lock ref '%s': %s", | |
e3f51039 | 2270 | original_update_refname(update), reason); |
165056b2 MH |
2271 | free(reason); |
2272 | return ret; | |
2273 | } | |
92b1551b | 2274 | |
7d618264 | 2275 | update->backend_data = lock; |
92b1551b | 2276 | |
8169d0d0 | 2277 | if (update->type & REF_ISSYMREF) { |
6e30b2f6 MH |
2278 | if (update->flags & REF_NODEREF) { |
2279 | /* | |
2280 | * We won't be reading the referent as part of | |
2281 | * the transaction, so we have to read it here | |
2282 | * to record and possibly check old_sha1: | |
2283 | */ | |
2f40e954 NTND |
2284 | if (refs_read_ref_full(&refs->base, |
2285 | referent.buf, 0, | |
2286 | lock->old_oid.hash, NULL)) { | |
6e30b2f6 MH |
2287 | if (update->flags & REF_HAVE_OLD) { |
2288 | strbuf_addf(err, "cannot lock ref '%s': " | |
e3f51039 MH |
2289 | "error reading reference", |
2290 | original_update_refname(update)); | |
2291 | return -1; | |
6e30b2f6 | 2292 | } |
e3f51039 | 2293 | } else if (check_old_oid(update, &lock->old_oid, err)) { |
8169d0d0 | 2294 | return TRANSACTION_GENERIC_ERROR; |
8169d0d0 | 2295 | } |
6e30b2f6 MH |
2296 | } else { |
2297 | /* | |
2298 | * Create a new update for the reference this | |
2299 | * symref is pointing at. Also, we will record | |
2300 | * and verify old_sha1 for this update as part | |
2301 | * of processing the split-off update, so we | |
2302 | * don't have to do it here. | |
2303 | */ | |
fcc42ea0 MH |
2304 | ret = split_symref_update(refs, update, |
2305 | referent.buf, transaction, | |
92b1551b MH |
2306 | affected_refnames, err); |
2307 | if (ret) | |
2308 | return ret; | |
2309 | } | |
6e30b2f6 MH |
2310 | } else { |
2311 | struct ref_update *parent_update; | |
8169d0d0 | 2312 | |
e3f51039 MH |
2313 | if (check_old_oid(update, &lock->old_oid, err)) |
2314 | return TRANSACTION_GENERIC_ERROR; | |
2315 | ||
6e30b2f6 MH |
2316 | /* |
2317 | * If this update is happening indirectly because of a | |
2318 | * symref update, record the old SHA-1 in the parent | |
2319 | * update: | |
2320 | */ | |
2321 | for (parent_update = update->parent_update; | |
2322 | parent_update; | |
2323 | parent_update = parent_update->parent_update) { | |
7d618264 DT |
2324 | struct ref_lock *parent_lock = parent_update->backend_data; |
2325 | oidcpy(&parent_lock->old_oid, &lock->old_oid); | |
6e30b2f6 | 2326 | } |
92b1551b MH |
2327 | } |
2328 | ||
165056b2 MH |
2329 | if ((update->flags & REF_HAVE_NEW) && |
2330 | !(update->flags & REF_DELETING) && | |
2331 | !(update->flags & REF_LOG_ONLY)) { | |
92b1551b | 2332 | if (!(update->type & REF_ISSYMREF) && |
98491298 | 2333 | !oidcmp(&lock->old_oid, &update->new_oid)) { |
165056b2 MH |
2334 | /* |
2335 | * The reference already has the desired | |
2336 | * value, so we don't need to write it. | |
2337 | */ | |
4417df8c | 2338 | } else if (write_ref_to_lockfile(lock, &update->new_oid, |
165056b2 MH |
2339 | err)) { |
2340 | char *write_err = strbuf_detach(err, NULL); | |
2341 | ||
2342 | /* | |
2343 | * The lock was freed upon failure of | |
2344 | * write_ref_to_lockfile(): | |
2345 | */ | |
7d618264 | 2346 | update->backend_data = NULL; |
165056b2 | 2347 | strbuf_addf(err, |
e3f51039 | 2348 | "cannot update ref '%s': %s", |
165056b2 MH |
2349 | update->refname, write_err); |
2350 | free(write_err); | |
2351 | return TRANSACTION_GENERIC_ERROR; | |
2352 | } else { | |
2353 | update->flags |= REF_NEEDS_COMMIT; | |
2354 | } | |
2355 | } | |
2356 | if (!(update->flags & REF_NEEDS_COMMIT)) { | |
2357 | /* | |
2358 | * We didn't call write_ref_to_lockfile(), so | |
2359 | * the lockfile is still open. Close it to | |
2360 | * free up the file descriptor: | |
2361 | */ | |
92b1551b | 2362 | if (close_ref(lock)) { |
165056b2 MH |
2363 | strbuf_addf(err, "couldn't close '%s.lock'", |
2364 | update->refname); | |
2365 | return TRANSACTION_GENERIC_ERROR; | |
2366 | } | |
2367 | } | |
2368 | return 0; | |
2369 | } | |
2370 | ||
c0ca9357 MH |
2371 | /* |
2372 | * Unlock any references in `transaction` that are still locked, and | |
2373 | * mark the transaction closed. | |
2374 | */ | |
2375 | static void files_transaction_cleanup(struct ref_transaction *transaction) | |
2376 | { | |
2377 | size_t i; | |
2378 | ||
2379 | for (i = 0; i < transaction->nr; i++) { | |
2380 | struct ref_update *update = transaction->updates[i]; | |
2381 | struct ref_lock *lock = update->backend_data; | |
2382 | ||
2383 | if (lock) { | |
2384 | unlock_ref(lock); | |
2385 | update->backend_data = NULL; | |
2386 | } | |
2387 | } | |
2388 | ||
2389 | transaction->state = REF_TRANSACTION_CLOSED; | |
2390 | } | |
2391 | ||
30173b88 MH |
2392 | static int files_transaction_prepare(struct ref_store *ref_store, |
2393 | struct ref_transaction *transaction, | |
2394 | struct strbuf *err) | |
7bd9bcf3 | 2395 | { |
00eebe35 | 2396 | struct files_ref_store *refs = |
9e7ec634 | 2397 | files_downcast(ref_store, REF_STORE_WRITE, |
30173b88 | 2398 | "ref_transaction_prepare"); |
43a2dfde MH |
2399 | size_t i; |
2400 | int ret = 0; | |
7bd9bcf3 | 2401 | struct string_list affected_refnames = STRING_LIST_INIT_NODUP; |
92b1551b MH |
2402 | char *head_ref = NULL; |
2403 | int head_type; | |
2404 | struct object_id head_oid; | |
7bd9bcf3 MH |
2405 | |
2406 | assert(err); | |
2407 | ||
c0ca9357 MH |
2408 | if (!transaction->nr) |
2409 | goto cleanup; | |
7bd9bcf3 | 2410 | |
92b1551b MH |
2411 | /* |
2412 | * Fail if a refname appears more than once in the | |
2413 | * transaction. (If we end up splitting up any updates using | |
2414 | * split_symref_update() or split_head_update(), those | |
2415 | * functions will check that the new updates don't have the | |
2416 | * same refname as any existing ones.) | |
2417 | */ | |
2418 | for (i = 0; i < transaction->nr; i++) { | |
2419 | struct ref_update *update = transaction->updates[i]; | |
2420 | struct string_list_item *item = | |
2421 | string_list_append(&affected_refnames, update->refname); | |
2422 | ||
2423 | /* | |
2424 | * We store a pointer to update in item->util, but at | |
2425 | * the moment we never use the value of this field | |
2426 | * except to check whether it is non-NULL. | |
2427 | */ | |
2428 | item->util = update; | |
2429 | } | |
7bd9bcf3 MH |
2430 | string_list_sort(&affected_refnames); |
2431 | if (ref_update_reject_duplicates(&affected_refnames, err)) { | |
2432 | ret = TRANSACTION_GENERIC_ERROR; | |
2433 | goto cleanup; | |
2434 | } | |
2435 | ||
92b1551b MH |
2436 | /* |
2437 | * Special hack: If a branch is updated directly and HEAD | |
2438 | * points to it (may happen on the remote side of a push | |
2439 | * for example) then logically the HEAD reflog should be | |
2440 | * updated too. | |
2441 | * | |
2442 | * A generic solution would require reverse symref lookups, | |
2443 | * but finding all symrefs pointing to a given branch would be | |
2444 | * rather costly for this rare event (the direct update of a | |
2445 | * branch) to be worth it. So let's cheat and check with HEAD | |
2446 | * only, which should cover 99% of all usage scenarios (even | |
2447 | * 100% of the default ones). | |
2448 | * | |
2449 | * So if HEAD is a symbolic reference, then record the name of | |
2450 | * the reference that it points to. If we see an update of | |
2451 | * head_ref within the transaction, then split_head_update() | |
2452 | * arranges for the reflog of HEAD to be updated, too. | |
2453 | */ | |
2f40e954 NTND |
2454 | head_ref = refs_resolve_refdup(ref_store, "HEAD", |
2455 | RESOLVE_REF_NO_RECURSE, | |
2456 | head_oid.hash, &head_type); | |
92b1551b MH |
2457 | |
2458 | if (head_ref && !(head_type & REF_ISSYMREF)) { | |
2459 | free(head_ref); | |
2460 | head_ref = NULL; | |
2461 | } | |
2462 | ||
7bd9bcf3 MH |
2463 | /* |
2464 | * Acquire all locks, verify old values if provided, check | |
2465 | * that new values are valid, and write new values to the | |
2466 | * lockfiles, ready to be activated. Only keep one lockfile | |
2467 | * open at a time to avoid running out of file descriptors. | |
30173b88 MH |
2468 | * Note that lock_ref_for_update() might append more updates |
2469 | * to the transaction. | |
7bd9bcf3 | 2470 | */ |
efe47281 MH |
2471 | for (i = 0; i < transaction->nr; i++) { |
2472 | struct ref_update *update = transaction->updates[i]; | |
7bd9bcf3 | 2473 | |
b3bbbc5c MH |
2474 | ret = lock_ref_for_update(refs, update, transaction, |
2475 | head_ref, &affected_refnames, err); | |
165056b2 | 2476 | if (ret) |
30173b88 MH |
2477 | break; |
2478 | } | |
2479 | ||
2480 | cleanup: | |
2481 | free(head_ref); | |
2482 | string_list_clear(&affected_refnames, 0); | |
2483 | ||
2484 | if (ret) | |
2485 | files_transaction_cleanup(transaction); | |
2486 | else | |
2487 | transaction->state = REF_TRANSACTION_PREPARED; | |
2488 | ||
2489 | return ret; | |
2490 | } | |
2491 | ||
2492 | static int files_transaction_finish(struct ref_store *ref_store, | |
2493 | struct ref_transaction *transaction, | |
2494 | struct strbuf *err) | |
2495 | { | |
2496 | struct files_ref_store *refs = | |
2497 | files_downcast(ref_store, 0, "ref_transaction_finish"); | |
2498 | size_t i; | |
2499 | int ret = 0; | |
2500 | struct string_list refs_to_delete = STRING_LIST_INIT_NODUP; | |
2501 | struct string_list_item *ref_to_delete; | |
2502 | struct strbuf sb = STRBUF_INIT; | |
2503 | ||
2504 | assert(err); | |
2505 | ||
2506 | if (!transaction->nr) { | |
2507 | transaction->state = REF_TRANSACTION_CLOSED; | |
2508 | return 0; | |
7bd9bcf3 | 2509 | } |
7bd9bcf3 | 2510 | |
7bd9bcf3 | 2511 | /* Perform updates first so live commits remain referenced */ |
efe47281 MH |
2512 | for (i = 0; i < transaction->nr; i++) { |
2513 | struct ref_update *update = transaction->updates[i]; | |
7d618264 | 2514 | struct ref_lock *lock = update->backend_data; |
7bd9bcf3 | 2515 | |
d99aa884 DT |
2516 | if (update->flags & REF_NEEDS_COMMIT || |
2517 | update->flags & REF_LOG_ONLY) { | |
802de3da NTND |
2518 | if (files_log_ref_write(refs, |
2519 | lock->ref_name, | |
4417df8c | 2520 | &lock->old_oid, |
2521 | &update->new_oid, | |
81b1b6d4 MH |
2522 | update->msg, update->flags, |
2523 | err)) { | |
92b1551b MH |
2524 | char *old_msg = strbuf_detach(err, NULL); |
2525 | ||
2526 | strbuf_addf(err, "cannot update the ref '%s': %s", | |
2527 | lock->ref_name, old_msg); | |
2528 | free(old_msg); | |
2529 | unlock_ref(lock); | |
7d618264 | 2530 | update->backend_data = NULL; |
7bd9bcf3 MH |
2531 | ret = TRANSACTION_GENERIC_ERROR; |
2532 | goto cleanup; | |
7bd9bcf3 MH |
2533 | } |
2534 | } | |
7bd9bcf3 | 2535 | if (update->flags & REF_NEEDS_COMMIT) { |
00eebe35 | 2536 | clear_loose_ref_cache(refs); |
92b1551b MH |
2537 | if (commit_ref(lock)) { |
2538 | strbuf_addf(err, "couldn't set '%s'", lock->ref_name); | |
2539 | unlock_ref(lock); | |
7d618264 | 2540 | update->backend_data = NULL; |
7bd9bcf3 MH |
2541 | ret = TRANSACTION_GENERIC_ERROR; |
2542 | goto cleanup; | |
7bd9bcf3 MH |
2543 | } |
2544 | } | |
2545 | } | |
7bd9bcf3 | 2546 | /* Perform deletes now that updates are safely completed */ |
efe47281 MH |
2547 | for (i = 0; i < transaction->nr; i++) { |
2548 | struct ref_update *update = transaction->updates[i]; | |
7d618264 | 2549 | struct ref_lock *lock = update->backend_data; |
7bd9bcf3 | 2550 | |
d99aa884 DT |
2551 | if (update->flags & REF_DELETING && |
2552 | !(update->flags & REF_LOG_ONLY)) { | |
ce0af24d MH |
2553 | if (!(update->type & REF_ISPACKED) || |
2554 | update->type & REF_ISSYMREF) { | |
2555 | /* It is a loose reference. */ | |
e9dcc305 | 2556 | strbuf_reset(&sb); |
19e02f4f | 2557 | files_ref_path(refs, &sb, lock->ref_name); |
e9dcc305 | 2558 | if (unlink_or_msg(sb.buf, err)) { |
ce0af24d MH |
2559 | ret = TRANSACTION_GENERIC_ERROR; |
2560 | goto cleanup; | |
2561 | } | |
44639777 | 2562 | update->flags |= REF_DELETED_LOOSE; |
7bd9bcf3 MH |
2563 | } |
2564 | ||
2565 | if (!(update->flags & REF_ISPRUNING)) | |
2566 | string_list_append(&refs_to_delete, | |
7d618264 | 2567 | lock->ref_name); |
7bd9bcf3 MH |
2568 | } |
2569 | } | |
2570 | ||
0f199b1e | 2571 | if (repack_without_refs(refs->packed_ref_store, &refs_to_delete, err)) { |
7bd9bcf3 MH |
2572 | ret = TRANSACTION_GENERIC_ERROR; |
2573 | goto cleanup; | |
2574 | } | |
44639777 MH |
2575 | |
2576 | /* Delete the reflogs of any references that were deleted: */ | |
2577 | for_each_string_list_item(ref_to_delete, &refs_to_delete) { | |
e9dcc305 | 2578 | strbuf_reset(&sb); |
802de3da | 2579 | files_reflog_path(refs, &sb, ref_to_delete->string); |
e9dcc305 | 2580 | if (!unlink_or_warn(sb.buf)) |
802de3da | 2581 | try_remove_empty_parents(refs, ref_to_delete->string, |
44639777 MH |
2582 | REMOVE_EMPTY_PARENTS_REFLOG); |
2583 | } | |
2584 | ||
00eebe35 | 2585 | clear_loose_ref_cache(refs); |
7bd9bcf3 MH |
2586 | |
2587 | cleanup: | |
c0ca9357 | 2588 | files_transaction_cleanup(transaction); |
7bd9bcf3 | 2589 | |
44639777 MH |
2590 | for (i = 0; i < transaction->nr; i++) { |
2591 | struct ref_update *update = transaction->updates[i]; | |
44639777 MH |
2592 | |
2593 | if (update->flags & REF_DELETED_LOOSE) { | |
2594 | /* | |
2595 | * The loose reference was deleted. Delete any | |
2596 | * empty parent directories. (Note that this | |
2597 | * can only work because we have already | |
2598 | * removed the lockfile.) | |
2599 | */ | |
802de3da | 2600 | try_remove_empty_parents(refs, update->refname, |
44639777 MH |
2601 | REMOVE_EMPTY_PARENTS_REF); |
2602 | } | |
2603 | } | |
2604 | ||
30173b88 | 2605 | strbuf_release(&sb); |
7bd9bcf3 | 2606 | string_list_clear(&refs_to_delete, 0); |
7bd9bcf3 MH |
2607 | return ret; |
2608 | } | |
2609 | ||
30173b88 MH |
2610 | static int files_transaction_abort(struct ref_store *ref_store, |
2611 | struct ref_transaction *transaction, | |
2612 | struct strbuf *err) | |
2613 | { | |
2614 | files_transaction_cleanup(transaction); | |
2615 | return 0; | |
2616 | } | |
2617 | ||
7bd9bcf3 MH |
2618 | static int ref_present(const char *refname, |
2619 | const struct object_id *oid, int flags, void *cb_data) | |
2620 | { | |
2621 | struct string_list *affected_refnames = cb_data; | |
2622 | ||
2623 | return string_list_has_string(affected_refnames, refname); | |
2624 | } | |
2625 | ||
fc681463 DT |
2626 | static int files_initial_transaction_commit(struct ref_store *ref_store, |
2627 | struct ref_transaction *transaction, | |
2628 | struct strbuf *err) | |
7bd9bcf3 | 2629 | { |
d99825ab | 2630 | struct files_ref_store *refs = |
9e7ec634 NTND |
2631 | files_downcast(ref_store, REF_STORE_WRITE, |
2632 | "initial_ref_transaction_commit"); | |
43a2dfde MH |
2633 | size_t i; |
2634 | int ret = 0; | |
7bd9bcf3 MH |
2635 | struct string_list affected_refnames = STRING_LIST_INIT_NODUP; |
2636 | ||
2637 | assert(err); | |
2638 | ||
2639 | if (transaction->state != REF_TRANSACTION_OPEN) | |
2640 | die("BUG: commit called for transaction that is not open"); | |
2641 | ||
2642 | /* Fail if a refname appears more than once in the transaction: */ | |
efe47281 MH |
2643 | for (i = 0; i < transaction->nr; i++) |
2644 | string_list_append(&affected_refnames, | |
2645 | transaction->updates[i]->refname); | |
7bd9bcf3 MH |
2646 | string_list_sort(&affected_refnames); |
2647 | if (ref_update_reject_duplicates(&affected_refnames, err)) { | |
2648 | ret = TRANSACTION_GENERIC_ERROR; | |
2649 | goto cleanup; | |
2650 | } | |
2651 | ||
2652 | /* | |
2653 | * It's really undefined to call this function in an active | |
2654 | * repository or when there are existing references: we are | |
2655 | * only locking and changing packed-refs, so (1) any | |
2656 | * simultaneous processes might try to change a reference at | |
2657 | * the same time we do, and (2) any existing loose versions of | |
2658 | * the references that we are setting would have precedence | |
2659 | * over our values. But some remote helpers create the remote | |
2660 | * "HEAD" and "master" branches before calling this function, | |
2661 | * so here we really only check that none of the references | |
2662 | * that we are creating already exists. | |
2663 | */ | |
2f40e954 NTND |
2664 | if (refs_for_each_rawref(&refs->base, ref_present, |
2665 | &affected_refnames)) | |
7bd9bcf3 MH |
2666 | die("BUG: initial ref transaction called with existing refs"); |
2667 | ||
efe47281 MH |
2668 | for (i = 0; i < transaction->nr; i++) { |
2669 | struct ref_update *update = transaction->updates[i]; | |
7bd9bcf3 MH |
2670 | |
2671 | if ((update->flags & REF_HAVE_OLD) && | |
98491298 | 2672 | !is_null_oid(&update->old_oid)) |
7bd9bcf3 | 2673 | die("BUG: initial ref transaction with old_sha1 set"); |
7d2df051 NTND |
2674 | if (refs_verify_refname_available(&refs->base, update->refname, |
2675 | &affected_refnames, NULL, | |
2676 | err)) { | |
7bd9bcf3 MH |
2677 | ret = TRANSACTION_NAME_CONFLICT; |
2678 | goto cleanup; | |
2679 | } | |
2680 | } | |
2681 | ||
b7de57d8 | 2682 | if (packed_refs_lock(refs->packed_ref_store, 0)) { |
7bd9bcf3 MH |
2683 | strbuf_addf(err, "unable to lock packed-refs file: %s", |
2684 | strerror(errno)); | |
2685 | ret = TRANSACTION_GENERIC_ERROR; | |
2686 | goto cleanup; | |
2687 | } | |
2688 | ||
efe47281 MH |
2689 | for (i = 0; i < transaction->nr; i++) { |
2690 | struct ref_update *update = transaction->updates[i]; | |
7bd9bcf3 MH |
2691 | |
2692 | if ((update->flags & REF_HAVE_NEW) && | |
98491298 | 2693 | !is_null_oid(&update->new_oid)) |
e70b7029 | 2694 | add_packed_ref(refs->packed_ref_store, update->refname, |
4417df8c | 2695 | &update->new_oid); |
7bd9bcf3 MH |
2696 | } |
2697 | ||
3478983b | 2698 | if (commit_packed_refs(refs->packed_ref_store, err)) { |
7bd9bcf3 MH |
2699 | ret = TRANSACTION_GENERIC_ERROR; |
2700 | goto cleanup; | |
2701 | } | |
2702 | ||
2703 | cleanup: | |
2704 | transaction->state = REF_TRANSACTION_CLOSED; | |
2705 | string_list_clear(&affected_refnames, 0); | |
2706 | return ret; | |
2707 | } | |
2708 | ||
2709 | struct expire_reflog_cb { | |
2710 | unsigned int flags; | |
2711 | reflog_expiry_should_prune_fn *should_prune_fn; | |
2712 | void *policy_cb; | |
2713 | FILE *newlog; | |
9461d272 | 2714 | struct object_id last_kept_oid; |
7bd9bcf3 MH |
2715 | }; |
2716 | ||
9461d272 | 2717 | static int expire_reflog_ent(struct object_id *ooid, struct object_id *noid, |
dddbad72 | 2718 | const char *email, timestamp_t timestamp, int tz, |
7bd9bcf3 MH |
2719 | const char *message, void *cb_data) |
2720 | { | |
2721 | struct expire_reflog_cb *cb = cb_data; | |
2722 | struct expire_reflog_policy_cb *policy_cb = cb->policy_cb; | |
2723 | ||
2724 | if (cb->flags & EXPIRE_REFLOGS_REWRITE) | |
9461d272 | 2725 | ooid = &cb->last_kept_oid; |
7bd9bcf3 | 2726 | |
4322478a | 2727 | if ((*cb->should_prune_fn)(ooid, noid, email, timestamp, tz, |
7bd9bcf3 MH |
2728 | message, policy_cb)) { |
2729 | if (!cb->newlog) | |
2730 | printf("would prune %s", message); | |
2731 | else if (cb->flags & EXPIRE_REFLOGS_VERBOSE) | |
2732 | printf("prune %s", message); | |
2733 | } else { | |
2734 | if (cb->newlog) { | |
cb71f8bd | 2735 | fprintf(cb->newlog, "%s %s %s %"PRItime" %+05d\t%s", |
9461d272 | 2736 | oid_to_hex(ooid), oid_to_hex(noid), |
7bd9bcf3 | 2737 | email, timestamp, tz, message); |
9461d272 | 2738 | oidcpy(&cb->last_kept_oid, noid); |
7bd9bcf3 MH |
2739 | } |
2740 | if (cb->flags & EXPIRE_REFLOGS_VERBOSE) | |
2741 | printf("keep %s", message); | |
2742 | } | |
2743 | return 0; | |
2744 | } | |
2745 | ||
e3688bd6 DT |
2746 | static int files_reflog_expire(struct ref_store *ref_store, |
2747 | const char *refname, const unsigned char *sha1, | |
2748 | unsigned int flags, | |
2749 | reflog_expiry_prepare_fn prepare_fn, | |
2750 | reflog_expiry_should_prune_fn should_prune_fn, | |
2751 | reflog_expiry_cleanup_fn cleanup_fn, | |
2752 | void *policy_cb_data) | |
7bd9bcf3 | 2753 | { |
7eb27cdf | 2754 | struct files_ref_store *refs = |
9e7ec634 | 2755 | files_downcast(ref_store, REF_STORE_WRITE, "reflog_expire"); |
7bd9bcf3 MH |
2756 | static struct lock_file reflog_lock; |
2757 | struct expire_reflog_cb cb; | |
2758 | struct ref_lock *lock; | |
802de3da | 2759 | struct strbuf log_file_sb = STRBUF_INIT; |
7bd9bcf3 MH |
2760 | char *log_file; |
2761 | int status = 0; | |
2762 | int type; | |
2763 | struct strbuf err = STRBUF_INIT; | |
4322478a | 2764 | struct object_id oid; |
7bd9bcf3 MH |
2765 | |
2766 | memset(&cb, 0, sizeof(cb)); | |
2767 | cb.flags = flags; | |
2768 | cb.policy_cb = policy_cb_data; | |
2769 | cb.should_prune_fn = should_prune_fn; | |
2770 | ||
2771 | /* | |
2772 | * The reflog file is locked by holding the lock on the | |
2773 | * reference itself, plus we might need to update the | |
2774 | * reference if --updateref was specified: | |
2775 | */ | |
7eb27cdf MH |
2776 | lock = lock_ref_sha1_basic(refs, refname, sha1, |
2777 | NULL, NULL, REF_NODEREF, | |
41d796ed | 2778 | &type, &err); |
7bd9bcf3 MH |
2779 | if (!lock) { |
2780 | error("cannot lock ref '%s': %s", refname, err.buf); | |
2781 | strbuf_release(&err); | |
2782 | return -1; | |
2783 | } | |
2f40e954 | 2784 | if (!refs_reflog_exists(ref_store, refname)) { |
7bd9bcf3 MH |
2785 | unlock_ref(lock); |
2786 | return 0; | |
2787 | } | |
2788 | ||
802de3da NTND |
2789 | files_reflog_path(refs, &log_file_sb, refname); |
2790 | log_file = strbuf_detach(&log_file_sb, NULL); | |
7bd9bcf3 MH |
2791 | if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) { |
2792 | /* | |
2793 | * Even though holding $GIT_DIR/logs/$reflog.lock has | |
2794 | * no locking implications, we use the lock_file | |
2795 | * machinery here anyway because it does a lot of the | |
2796 | * work we need, including cleaning up if the program | |
2797 | * exits unexpectedly. | |
2798 | */ | |
2799 | if (hold_lock_file_for_update(&reflog_lock, log_file, 0) < 0) { | |
2800 | struct strbuf err = STRBUF_INIT; | |
2801 | unable_to_lock_message(log_file, errno, &err); | |
2802 | error("%s", err.buf); | |
2803 | strbuf_release(&err); | |
2804 | goto failure; | |
2805 | } | |
2806 | cb.newlog = fdopen_lock_file(&reflog_lock, "w"); | |
2807 | if (!cb.newlog) { | |
2808 | error("cannot fdopen %s (%s)", | |
2809 | get_lock_file_path(&reflog_lock), strerror(errno)); | |
2810 | goto failure; | |
2811 | } | |
2812 | } | |
2813 | ||
4322478a | 2814 | hashcpy(oid.hash, sha1); |
2815 | ||
2816 | (*prepare_fn)(refname, &oid, cb.policy_cb); | |
2f40e954 | 2817 | refs_for_each_reflog_ent(ref_store, refname, expire_reflog_ent, &cb); |
7bd9bcf3 MH |
2818 | (*cleanup_fn)(cb.policy_cb); |
2819 | ||
2820 | if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) { | |
2821 | /* | |
2822 | * It doesn't make sense to adjust a reference pointed | |
2823 | * to by a symbolic ref based on expiring entries in | |
2824 | * the symbolic reference's reflog. Nor can we update | |
2825 | * a reference if there are no remaining reflog | |
2826 | * entries. | |
2827 | */ | |
2828 | int update = (flags & EXPIRE_REFLOGS_UPDATE_REF) && | |
2829 | !(type & REF_ISSYMREF) && | |
9461d272 | 2830 | !is_null_oid(&cb.last_kept_oid); |
7bd9bcf3 MH |
2831 | |
2832 | if (close_lock_file(&reflog_lock)) { | |
2833 | status |= error("couldn't write %s: %s", log_file, | |
2834 | strerror(errno)); | |
2835 | } else if (update && | |
2836 | (write_in_full(get_lock_file_fd(lock->lk), | |
9461d272 | 2837 | oid_to_hex(&cb.last_kept_oid), GIT_SHA1_HEXSZ) != GIT_SHA1_HEXSZ || |
7bd9bcf3 MH |
2838 | write_str_in_full(get_lock_file_fd(lock->lk), "\n") != 1 || |
2839 | close_ref(lock) < 0)) { | |
2840 | status |= error("couldn't write %s", | |
2841 | get_lock_file_path(lock->lk)); | |
2842 | rollback_lock_file(&reflog_lock); | |
2843 | } else if (commit_lock_file(&reflog_lock)) { | |
e0048d3e | 2844 | status |= error("unable to write reflog '%s' (%s)", |
7bd9bcf3 MH |
2845 | log_file, strerror(errno)); |
2846 | } else if (update && commit_ref(lock)) { | |
2847 | status |= error("couldn't set %s", lock->ref_name); | |
2848 | } | |
2849 | } | |
2850 | free(log_file); | |
2851 | unlock_ref(lock); | |
2852 | return status; | |
2853 | ||
2854 | failure: | |
2855 | rollback_lock_file(&reflog_lock); | |
2856 | free(log_file); | |
2857 | unlock_ref(lock); | |
2858 | return -1; | |
2859 | } | |
3dce444f | 2860 | |
6fb5acfd DT |
2861 | static int files_init_db(struct ref_store *ref_store, struct strbuf *err) |
2862 | { | |
19e02f4f | 2863 | struct files_ref_store *refs = |
9e7ec634 | 2864 | files_downcast(ref_store, REF_STORE_WRITE, "init_db"); |
e9dcc305 NTND |
2865 | struct strbuf sb = STRBUF_INIT; |
2866 | ||
6fb5acfd DT |
2867 | /* |
2868 | * Create .git/refs/{heads,tags} | |
2869 | */ | |
19e02f4f | 2870 | files_ref_path(refs, &sb, "refs/heads"); |
e9dcc305 NTND |
2871 | safe_create_dir(sb.buf, 1); |
2872 | ||
2873 | strbuf_reset(&sb); | |
19e02f4f | 2874 | files_ref_path(refs, &sb, "refs/tags"); |
e9dcc305 NTND |
2875 | safe_create_dir(sb.buf, 1); |
2876 | ||
2877 | strbuf_release(&sb); | |
6fb5acfd DT |
2878 | return 0; |
2879 | } | |
2880 | ||
3dce444f RS |
2881 | struct ref_storage_be refs_be_files = { |
2882 | NULL, | |
00eebe35 | 2883 | "files", |
127b42a1 | 2884 | files_ref_store_create, |
6fb5acfd | 2885 | files_init_db, |
30173b88 MH |
2886 | files_transaction_prepare, |
2887 | files_transaction_finish, | |
2888 | files_transaction_abort, | |
fc681463 | 2889 | files_initial_transaction_commit, |
e1e33b72 | 2890 | |
8231527e | 2891 | files_pack_refs, |
bd427cf2 | 2892 | files_peel_ref, |
284689ba | 2893 | files_create_symref, |
a27dcf89 | 2894 | files_delete_refs, |
9b6b40d9 | 2895 | files_rename_ref, |
8231527e | 2896 | |
1a769003 | 2897 | files_ref_iterator_begin, |
62665823 | 2898 | files_read_raw_ref, |
e3688bd6 DT |
2899 | |
2900 | files_reflog_iterator_begin, | |
2901 | files_for_each_reflog_ent, | |
2902 | files_for_each_reflog_ent_reverse, | |
2903 | files_reflog_exists, | |
2904 | files_create_reflog, | |
2905 | files_delete_reflog, | |
2906 | files_reflog_expire | |
3dce444f | 2907 | }; |