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Commit | Line | Data |
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7bd9bcf3 | 1 | #include "../cache.h" |
b2141fc1 | 2 | #include "../config.h" |
7bd9bcf3 MH |
3 | #include "../refs.h" |
4 | #include "refs-internal.h" | |
958f9646 | 5 | #include "ref-cache.h" |
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 | 18 | /* |
a8739244 MH |
19 | * Return true if refname, which has the specified oid and flags, can |
20 | * be resolved to an object in the database. If the referred-to object | |
21 | * does not exist, emit a warning and return false. | |
7bd9bcf3 | 22 | */ |
a8739244 MH |
23 | static int ref_resolves_to_object(const char *refname, |
24 | const struct object_id *oid, | |
25 | unsigned int flags) | |
7bd9bcf3 | 26 | { |
a8739244 | 27 | if (flags & REF_ISBROKEN) |
7bd9bcf3 | 28 | return 0; |
a8739244 MH |
29 | if (!has_sha1_file(oid->hash)) { |
30 | error("%s does not point to a valid object!", refname); | |
7bd9bcf3 MH |
31 | return 0; |
32 | } | |
33 | return 1; | |
34 | } | |
35 | ||
7bd9bcf3 | 36 | struct packed_ref_cache { |
7c22bc8a | 37 | struct ref_cache *cache; |
7bd9bcf3 MH |
38 | |
39 | /* | |
40 | * Count of references to the data structure in this instance, | |
65a0a8e5 MH |
41 | * including the pointer from files_ref_store::packed if any. |
42 | * The data will not be freed as long as the reference count | |
43 | * is nonzero. | |
7bd9bcf3 MH |
44 | */ |
45 | unsigned int referrers; | |
46 | ||
7bd9bcf3 MH |
47 | /* The metadata from when this packed-refs cache was read */ |
48 | struct stat_validity validity; | |
49 | }; | |
50 | ||
51 | /* | |
52 | * Future: need to be in "struct repository" | |
53 | * when doing a full libification. | |
54 | */ | |
00eebe35 MH |
55 | struct files_ref_store { |
56 | struct ref_store base; | |
9e7ec634 | 57 | unsigned int store_flags; |
32c597e7 | 58 | |
f57f37e2 NTND |
59 | char *gitdir; |
60 | char *gitcommondir; | |
33dfb9f3 NTND |
61 | char *packed_refs_path; |
62 | ||
7c22bc8a | 63 | struct ref_cache *loose; |
7bd9bcf3 | 64 | struct packed_ref_cache *packed; |
55c6bc37 MH |
65 | |
66 | /* | |
00d17448 MH |
67 | * Lock used for the "packed-refs" file. Note that this (and |
68 | * thus the enclosing `files_ref_store`) must not be freed. | |
55c6bc37 | 69 | */ |
00d17448 | 70 | struct lock_file packed_refs_lock; |
00eebe35 | 71 | }; |
7bd9bcf3 | 72 | |
7bd9bcf3 MH |
73 | /* |
74 | * Increment the reference count of *packed_refs. | |
75 | */ | |
76 | static void acquire_packed_ref_cache(struct packed_ref_cache *packed_refs) | |
77 | { | |
78 | packed_refs->referrers++; | |
79 | } | |
80 | ||
81 | /* | |
82 | * Decrease the reference count of *packed_refs. If it goes to zero, | |
83 | * free *packed_refs and return true; otherwise return false. | |
84 | */ | |
85 | static int release_packed_ref_cache(struct packed_ref_cache *packed_refs) | |
86 | { | |
87 | if (!--packed_refs->referrers) { | |
7c22bc8a | 88 | free_ref_cache(packed_refs->cache); |
7bd9bcf3 MH |
89 | stat_validity_clear(&packed_refs->validity); |
90 | free(packed_refs); | |
91 | return 1; | |
92 | } else { | |
93 | return 0; | |
94 | } | |
95 | } | |
96 | ||
65a0a8e5 | 97 | static void clear_packed_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 MH |
98 | { |
99 | if (refs->packed) { | |
100 | struct packed_ref_cache *packed_refs = refs->packed; | |
101 | ||
00d17448 | 102 | if (is_lock_file_locked(&refs->packed_refs_lock)) |
04aea8d4 | 103 | die("BUG: packed-ref cache cleared while locked"); |
7bd9bcf3 MH |
104 | refs->packed = NULL; |
105 | release_packed_ref_cache(packed_refs); | |
106 | } | |
107 | } | |
108 | ||
65a0a8e5 | 109 | static void clear_loose_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 MH |
110 | { |
111 | if (refs->loose) { | |
7c22bc8a | 112 | free_ref_cache(refs->loose); |
7bd9bcf3 MH |
113 | refs->loose = NULL; |
114 | } | |
115 | } | |
116 | ||
a2d5156c JK |
117 | /* |
118 | * Create a new submodule ref cache and add it to the internal | |
119 | * set of caches. | |
120 | */ | |
9e7ec634 NTND |
121 | static struct ref_store *files_ref_store_create(const char *gitdir, |
122 | unsigned int flags) | |
7bd9bcf3 | 123 | { |
00eebe35 MH |
124 | struct files_ref_store *refs = xcalloc(1, sizeof(*refs)); |
125 | struct ref_store *ref_store = (struct ref_store *)refs; | |
f57f37e2 | 126 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 | 127 | |
fbfd0a29 | 128 | base_ref_store_init(ref_store, &refs_be_files); |
9e7ec634 | 129 | refs->store_flags = flags; |
7bd9bcf3 | 130 | |
f57f37e2 NTND |
131 | refs->gitdir = xstrdup(gitdir); |
132 | get_common_dir_noenv(&sb, gitdir); | |
133 | refs->gitcommondir = strbuf_detach(&sb, NULL); | |
134 | strbuf_addf(&sb, "%s/packed-refs", refs->gitcommondir); | |
135 | refs->packed_refs_path = strbuf_detach(&sb, NULL); | |
7bd9bcf3 | 136 | |
00eebe35 | 137 | return ref_store; |
a2d5156c | 138 | } |
7bd9bcf3 | 139 | |
32c597e7 | 140 | /* |
9e7ec634 NTND |
141 | * Die if refs is not the main ref store. caller is used in any |
142 | * necessary error messages. | |
32c597e7 MH |
143 | */ |
144 | static void files_assert_main_repository(struct files_ref_store *refs, | |
145 | const char *caller) | |
146 | { | |
9e7ec634 NTND |
147 | if (refs->store_flags & REF_STORE_MAIN) |
148 | return; | |
149 | ||
150 | die("BUG: operation %s only allowed for main ref store", caller); | |
32c597e7 MH |
151 | } |
152 | ||
a2d5156c | 153 | /* |
00eebe35 | 154 | * Downcast ref_store to files_ref_store. Die if ref_store is not a |
9e7ec634 NTND |
155 | * files_ref_store. required_flags is compared with ref_store's |
156 | * store_flags to ensure the ref_store has all required capabilities. | |
157 | * "caller" is used in any necessary error messages. | |
a2d5156c | 158 | */ |
9e7ec634 NTND |
159 | static struct files_ref_store *files_downcast(struct ref_store *ref_store, |
160 | unsigned int required_flags, | |
161 | const char *caller) | |
a2d5156c | 162 | { |
32c597e7 MH |
163 | struct files_ref_store *refs; |
164 | ||
00eebe35 MH |
165 | if (ref_store->be != &refs_be_files) |
166 | die("BUG: ref_store is type \"%s\" not \"files\" in %s", | |
167 | ref_store->be->name, caller); | |
2eed2780 | 168 | |
32c597e7 MH |
169 | refs = (struct files_ref_store *)ref_store; |
170 | ||
9e7ec634 NTND |
171 | if ((refs->store_flags & required_flags) != required_flags) |
172 | die("BUG: operation %s requires abilities 0x%x, but only have 0x%x", | |
173 | caller, required_flags, refs->store_flags); | |
2eed2780 | 174 | |
32c597e7 | 175 | return refs; |
7bd9bcf3 MH |
176 | } |
177 | ||
178 | /* The length of a peeled reference line in packed-refs, including EOL: */ | |
179 | #define PEELED_LINE_LENGTH 42 | |
180 | ||
181 | /* | |
182 | * The packed-refs header line that we write out. Perhaps other | |
183 | * traits will be added later. The trailing space is required. | |
184 | */ | |
185 | static const char PACKED_REFS_HEADER[] = | |
186 | "# pack-refs with: peeled fully-peeled \n"; | |
187 | ||
188 | /* | |
189 | * Parse one line from a packed-refs file. Write the SHA1 to sha1. | |
190 | * Return a pointer to the refname within the line (null-terminated), | |
191 | * or NULL if there was a problem. | |
192 | */ | |
4417df8c | 193 | static const char *parse_ref_line(struct strbuf *line, struct object_id *oid) |
7bd9bcf3 MH |
194 | { |
195 | const char *ref; | |
196 | ||
4417df8c | 197 | if (parse_oid_hex(line->buf, oid, &ref) < 0) |
7bd9bcf3 | 198 | return NULL; |
4417df8c | 199 | if (!isspace(*ref++)) |
7bd9bcf3 MH |
200 | return NULL; |
201 | ||
7bd9bcf3 MH |
202 | if (isspace(*ref)) |
203 | return NULL; | |
204 | ||
205 | if (line->buf[line->len - 1] != '\n') | |
206 | return NULL; | |
207 | line->buf[--line->len] = 0; | |
208 | ||
209 | return ref; | |
210 | } | |
211 | ||
212 | /* | |
099a912a MH |
213 | * Read from `packed_refs_file` into a newly-allocated |
214 | * `packed_ref_cache` and return it. The return value will already | |
215 | * have its reference count incremented. | |
7bd9bcf3 MH |
216 | * |
217 | * A comment line of the form "# pack-refs with: " may contain zero or | |
218 | * more traits. We interpret the traits as follows: | |
219 | * | |
220 | * No traits: | |
221 | * | |
222 | * Probably no references are peeled. But if the file contains a | |
223 | * peeled value for a reference, we will use it. | |
224 | * | |
225 | * peeled: | |
226 | * | |
227 | * References under "refs/tags/", if they *can* be peeled, *are* | |
228 | * peeled in this file. References outside of "refs/tags/" are | |
229 | * probably not peeled even if they could have been, but if we find | |
230 | * a peeled value for such a reference we will use it. | |
231 | * | |
232 | * fully-peeled: | |
233 | * | |
234 | * All references in the file that can be peeled are peeled. | |
235 | * Inversely (and this is more important), any references in the | |
236 | * file for which no peeled value is recorded is not peelable. This | |
237 | * trait should typically be written alongside "peeled" for | |
238 | * compatibility with older clients, but we do not require it | |
239 | * (i.e., "peeled" is a no-op if "fully-peeled" is set). | |
240 | */ | |
099a912a | 241 | static struct packed_ref_cache *read_packed_refs(const char *packed_refs_file) |
7bd9bcf3 | 242 | { |
099a912a MH |
243 | FILE *f; |
244 | struct packed_ref_cache *packed_refs = xcalloc(1, sizeof(*packed_refs)); | |
7bd9bcf3 MH |
245 | struct ref_entry *last = NULL; |
246 | struct strbuf line = STRBUF_INIT; | |
247 | enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE; | |
099a912a | 248 | struct ref_dir *dir; |
7bd9bcf3 | 249 | |
099a912a MH |
250 | acquire_packed_ref_cache(packed_refs); |
251 | packed_refs->cache = create_ref_cache(NULL, NULL); | |
252 | packed_refs->cache->root->flag &= ~REF_INCOMPLETE; | |
253 | ||
254 | f = fopen(packed_refs_file, "r"); | |
89c571da MH |
255 | if (!f) { |
256 | if (errno == ENOENT) { | |
257 | /* | |
258 | * This is OK; it just means that no | |
259 | * "packed-refs" file has been written yet, | |
260 | * which is equivalent to it being empty. | |
261 | */ | |
262 | return packed_refs; | |
263 | } else { | |
264 | die_errno("couldn't read %s", packed_refs_file); | |
265 | } | |
266 | } | |
099a912a MH |
267 | |
268 | stat_validity_update(&packed_refs->validity, fileno(f)); | |
269 | ||
270 | dir = get_ref_dir(packed_refs->cache->root); | |
7bd9bcf3 | 271 | while (strbuf_getwholeline(&line, f, '\n') != EOF) { |
4417df8c | 272 | struct object_id oid; |
7bd9bcf3 MH |
273 | const char *refname; |
274 | const char *traits; | |
275 | ||
276 | if (skip_prefix(line.buf, "# pack-refs with:", &traits)) { | |
277 | if (strstr(traits, " fully-peeled ")) | |
278 | peeled = PEELED_FULLY; | |
279 | else if (strstr(traits, " peeled ")) | |
280 | peeled = PEELED_TAGS; | |
281 | /* perhaps other traits later as well */ | |
282 | continue; | |
283 | } | |
284 | ||
4417df8c | 285 | refname = parse_ref_line(&line, &oid); |
7bd9bcf3 MH |
286 | if (refname) { |
287 | int flag = REF_ISPACKED; | |
288 | ||
289 | if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) { | |
290 | if (!refname_is_safe(refname)) | |
291 | die("packed refname is dangerous: %s", refname); | |
4417df8c | 292 | oidclr(&oid); |
7bd9bcf3 MH |
293 | flag |= REF_BAD_NAME | REF_ISBROKEN; |
294 | } | |
c1da06c6 | 295 | last = create_ref_entry(refname, &oid, flag); |
7bd9bcf3 MH |
296 | if (peeled == PEELED_FULLY || |
297 | (peeled == PEELED_TAGS && starts_with(refname, "refs/tags/"))) | |
298 | last->flag |= REF_KNOWS_PEELED; | |
a3ade2ba | 299 | add_ref_entry(dir, last); |
7bd9bcf3 MH |
300 | continue; |
301 | } | |
302 | if (last && | |
303 | line.buf[0] == '^' && | |
304 | line.len == PEELED_LINE_LENGTH && | |
305 | line.buf[PEELED_LINE_LENGTH - 1] == '\n' && | |
4417df8c | 306 | !get_oid_hex(line.buf + 1, &oid)) { |
307 | oidcpy(&last->u.value.peeled, &oid); | |
7bd9bcf3 MH |
308 | /* |
309 | * Regardless of what the file header said, | |
310 | * we definitely know the value of *this* | |
311 | * reference: | |
312 | */ | |
313 | last->flag |= REF_KNOWS_PEELED; | |
314 | } | |
315 | } | |
316 | ||
099a912a | 317 | fclose(f); |
7bd9bcf3 | 318 | strbuf_release(&line); |
099a912a MH |
319 | |
320 | return packed_refs; | |
7bd9bcf3 MH |
321 | } |
322 | ||
33dfb9f3 NTND |
323 | static const char *files_packed_refs_path(struct files_ref_store *refs) |
324 | { | |
325 | return refs->packed_refs_path; | |
326 | } | |
327 | ||
802de3da NTND |
328 | static void files_reflog_path(struct files_ref_store *refs, |
329 | struct strbuf *sb, | |
330 | const char *refname) | |
331 | { | |
332 | if (!refname) { | |
f57f37e2 NTND |
333 | /* |
334 | * FIXME: of course this is wrong in multi worktree | |
335 | * setting. To be fixed real soon. | |
336 | */ | |
337 | strbuf_addf(sb, "%s/logs", refs->gitcommondir); | |
802de3da NTND |
338 | return; |
339 | } | |
340 | ||
f57f37e2 NTND |
341 | switch (ref_type(refname)) { |
342 | case REF_TYPE_PER_WORKTREE: | |
343 | case REF_TYPE_PSEUDOREF: | |
344 | strbuf_addf(sb, "%s/logs/%s", refs->gitdir, refname); | |
345 | break; | |
346 | case REF_TYPE_NORMAL: | |
347 | strbuf_addf(sb, "%s/logs/%s", refs->gitcommondir, refname); | |
348 | break; | |
349 | default: | |
350 | die("BUG: unknown ref type %d of ref %s", | |
351 | ref_type(refname), refname); | |
352 | } | |
802de3da NTND |
353 | } |
354 | ||
19e02f4f NTND |
355 | static void files_ref_path(struct files_ref_store *refs, |
356 | struct strbuf *sb, | |
357 | const char *refname) | |
358 | { | |
f57f37e2 NTND |
359 | switch (ref_type(refname)) { |
360 | case REF_TYPE_PER_WORKTREE: | |
361 | case REF_TYPE_PSEUDOREF: | |
362 | strbuf_addf(sb, "%s/%s", refs->gitdir, refname); | |
363 | break; | |
364 | case REF_TYPE_NORMAL: | |
365 | strbuf_addf(sb, "%s/%s", refs->gitcommondir, refname); | |
366 | break; | |
367 | default: | |
368 | die("BUG: unknown ref type %d of ref %s", | |
369 | ref_type(refname), refname); | |
370 | } | |
19e02f4f NTND |
371 | } |
372 | ||
fed6ebeb MH |
373 | /* |
374 | * Check that the packed refs cache (if any) still reflects the | |
375 | * contents of the file. If not, clear the cache. | |
376 | */ | |
377 | static void validate_packed_ref_cache(struct files_ref_store *refs) | |
378 | { | |
379 | if (refs->packed && | |
380 | !stat_validity_check(&refs->packed->validity, | |
381 | files_packed_refs_path(refs))) | |
382 | clear_packed_ref_cache(refs); | |
383 | } | |
384 | ||
7bd9bcf3 | 385 | /* |
65a0a8e5 | 386 | * Get the packed_ref_cache for the specified files_ref_store, |
28ed9830 MH |
387 | * creating and populating it if it hasn't been read before or if the |
388 | * file has been changed (according to its `validity` field) since it | |
389 | * was last read. On the other hand, if we hold the lock, then assume | |
390 | * that the file hasn't been changed out from under us, so skip the | |
391 | * extra `stat()` call in `stat_validity_check()`. | |
7bd9bcf3 | 392 | */ |
65a0a8e5 | 393 | static struct packed_ref_cache *get_packed_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 | 394 | { |
33dfb9f3 | 395 | const char *packed_refs_file = files_packed_refs_path(refs); |
7bd9bcf3 | 396 | |
fed6ebeb MH |
397 | if (!is_lock_file_locked(&refs->packed_refs_lock)) |
398 | validate_packed_ref_cache(refs); | |
7bd9bcf3 | 399 | |
099a912a MH |
400 | if (!refs->packed) |
401 | refs->packed = read_packed_refs(packed_refs_file); | |
402 | ||
7bd9bcf3 MH |
403 | return refs->packed; |
404 | } | |
405 | ||
406 | static struct ref_dir *get_packed_ref_dir(struct packed_ref_cache *packed_ref_cache) | |
407 | { | |
7c22bc8a | 408 | return get_ref_dir(packed_ref_cache->cache->root); |
7bd9bcf3 MH |
409 | } |
410 | ||
65a0a8e5 | 411 | static struct ref_dir *get_packed_refs(struct files_ref_store *refs) |
7bd9bcf3 MH |
412 | { |
413 | return get_packed_ref_dir(get_packed_ref_cache(refs)); | |
414 | } | |
415 | ||
416 | /* | |
417 | * Add a reference to the in-memory packed reference cache. This may | |
418 | * only be called while the packed-refs file is locked (see | |
419 | * lock_packed_refs()). To actually write the packed-refs file, call | |
420 | * commit_packed_refs(). | |
421 | */ | |
d99825ab | 422 | static void add_packed_ref(struct files_ref_store *refs, |
4417df8c | 423 | const char *refname, const struct object_id *oid) |
7bd9bcf3 | 424 | { |
00eebe35 | 425 | struct packed_ref_cache *packed_ref_cache = get_packed_ref_cache(refs); |
7bd9bcf3 | 426 | |
00d17448 | 427 | if (!is_lock_file_locked(&refs->packed_refs_lock)) |
04aea8d4 | 428 | die("BUG: packed refs not locked"); |
c1da06c6 MH |
429 | |
430 | if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) | |
431 | die("Reference has invalid format: '%s'", refname); | |
432 | ||
a3ade2ba | 433 | add_ref_entry(get_packed_ref_dir(packed_ref_cache), |
c1da06c6 | 434 | create_ref_entry(refname, oid, REF_ISPACKED)); |
7bd9bcf3 MH |
435 | } |
436 | ||
437 | /* | |
438 | * Read the loose references from the namespace dirname into dir | |
439 | * (without recursing). dirname must end with '/'. dir must be the | |
440 | * directory entry corresponding to dirname. | |
441 | */ | |
df308759 MH |
442 | static void loose_fill_ref_dir(struct ref_store *ref_store, |
443 | struct ref_dir *dir, const char *dirname) | |
7bd9bcf3 | 444 | { |
df308759 MH |
445 | struct files_ref_store *refs = |
446 | files_downcast(ref_store, REF_STORE_READ, "fill_ref_dir"); | |
7bd9bcf3 MH |
447 | DIR *d; |
448 | struct dirent *de; | |
449 | int dirnamelen = strlen(dirname); | |
450 | struct strbuf refname; | |
451 | struct strbuf path = STRBUF_INIT; | |
452 | size_t path_baselen; | |
453 | ||
19e02f4f | 454 | files_ref_path(refs, &path, dirname); |
7bd9bcf3 MH |
455 | path_baselen = path.len; |
456 | ||
457 | d = opendir(path.buf); | |
458 | if (!d) { | |
459 | strbuf_release(&path); | |
460 | return; | |
461 | } | |
462 | ||
463 | strbuf_init(&refname, dirnamelen + 257); | |
464 | strbuf_add(&refname, dirname, dirnamelen); | |
465 | ||
466 | while ((de = readdir(d)) != NULL) { | |
4417df8c | 467 | struct object_id oid; |
7bd9bcf3 MH |
468 | struct stat st; |
469 | int flag; | |
470 | ||
471 | if (de->d_name[0] == '.') | |
472 | continue; | |
473 | if (ends_with(de->d_name, ".lock")) | |
474 | continue; | |
475 | strbuf_addstr(&refname, de->d_name); | |
476 | strbuf_addstr(&path, de->d_name); | |
477 | if (stat(path.buf, &st) < 0) { | |
478 | ; /* silently ignore */ | |
479 | } else if (S_ISDIR(st.st_mode)) { | |
480 | strbuf_addch(&refname, '/'); | |
481 | add_entry_to_dir(dir, | |
e00d1a4f | 482 | create_dir_entry(dir->cache, refname.buf, |
7bd9bcf3 MH |
483 | refname.len, 1)); |
484 | } else { | |
7d2df051 | 485 | if (!refs_resolve_ref_unsafe(&refs->base, |
3c0cb0cb MH |
486 | refname.buf, |
487 | RESOLVE_REF_READING, | |
4417df8c | 488 | oid.hash, &flag)) { |
489 | oidclr(&oid); | |
7bd9bcf3 | 490 | flag |= REF_ISBROKEN; |
4417df8c | 491 | } else if (is_null_oid(&oid)) { |
7bd9bcf3 MH |
492 | /* |
493 | * It is so astronomically unlikely | |
494 | * that NULL_SHA1 is the SHA-1 of an | |
495 | * actual object that we consider its | |
496 | * appearance in a loose reference | |
497 | * file to be repo corruption | |
498 | * (probably due to a software bug). | |
499 | */ | |
500 | flag |= REF_ISBROKEN; | |
501 | } | |
502 | ||
503 | if (check_refname_format(refname.buf, | |
504 | REFNAME_ALLOW_ONELEVEL)) { | |
505 | if (!refname_is_safe(refname.buf)) | |
506 | die("loose refname is dangerous: %s", refname.buf); | |
4417df8c | 507 | oidclr(&oid); |
7bd9bcf3 MH |
508 | flag |= REF_BAD_NAME | REF_ISBROKEN; |
509 | } | |
510 | add_entry_to_dir(dir, | |
c1da06c6 | 511 | create_ref_entry(refname.buf, &oid, flag)); |
7bd9bcf3 MH |
512 | } |
513 | strbuf_setlen(&refname, dirnamelen); | |
514 | strbuf_setlen(&path, path_baselen); | |
515 | } | |
516 | strbuf_release(&refname); | |
517 | strbuf_release(&path); | |
518 | closedir(d); | |
e3bf2989 MH |
519 | |
520 | /* | |
521 | * Manually add refs/bisect, which, being per-worktree, might | |
522 | * not appear in the directory listing for refs/ in the main | |
523 | * repo. | |
524 | */ | |
525 | if (!strcmp(dirname, "refs/")) { | |
526 | int pos = search_ref_dir(dir, "refs/bisect/", 12); | |
527 | ||
528 | if (pos < 0) { | |
529 | struct ref_entry *child_entry = create_dir_entry( | |
530 | dir->cache, "refs/bisect/", 12, 1); | |
531 | add_entry_to_dir(dir, child_entry); | |
532 | } | |
533 | } | |
7bd9bcf3 MH |
534 | } |
535 | ||
a714b19c | 536 | static struct ref_cache *get_loose_ref_cache(struct files_ref_store *refs) |
7bd9bcf3 MH |
537 | { |
538 | if (!refs->loose) { | |
539 | /* | |
540 | * Mark the top-level directory complete because we | |
541 | * are about to read the only subdirectory that can | |
542 | * hold references: | |
543 | */ | |
df308759 | 544 | refs->loose = create_ref_cache(&refs->base, loose_fill_ref_dir); |
7c22bc8a MH |
545 | |
546 | /* We're going to fill the top level ourselves: */ | |
547 | refs->loose->root->flag &= ~REF_INCOMPLETE; | |
548 | ||
7bd9bcf3 | 549 | /* |
7c22bc8a MH |
550 | * Add an incomplete entry for "refs/" (to be filled |
551 | * lazily): | |
7bd9bcf3 | 552 | */ |
7c22bc8a | 553 | add_entry_to_dir(get_ref_dir(refs->loose->root), |
e00d1a4f | 554 | create_dir_entry(refs->loose, "refs/", 5, 1)); |
7bd9bcf3 | 555 | } |
a714b19c | 556 | return refs->loose; |
7bd9bcf3 MH |
557 | } |
558 | ||
7bd9bcf3 MH |
559 | /* |
560 | * Return the ref_entry for the given refname from the packed | |
561 | * references. If it does not exist, return NULL. | |
562 | */ | |
f0d21efc MH |
563 | static struct ref_entry *get_packed_ref(struct files_ref_store *refs, |
564 | const char *refname) | |
7bd9bcf3 | 565 | { |
bc1c696e | 566 | return find_ref_entry(get_packed_refs(refs), refname); |
7bd9bcf3 MH |
567 | } |
568 | ||
569 | /* | |
419c6f4c | 570 | * A loose ref file doesn't exist; check for a packed ref. |
7bd9bcf3 | 571 | */ |
611118d0 MH |
572 | static int resolve_packed_ref(struct files_ref_store *refs, |
573 | const char *refname, | |
574 | unsigned char *sha1, unsigned int *flags) | |
7bd9bcf3 MH |
575 | { |
576 | struct ref_entry *entry; | |
577 | ||
578 | /* | |
579 | * The loose reference file does not exist; check for a packed | |
580 | * reference. | |
581 | */ | |
f0d21efc | 582 | entry = get_packed_ref(refs, refname); |
7bd9bcf3 MH |
583 | if (entry) { |
584 | hashcpy(sha1, entry->u.value.oid.hash); | |
a70a93b7 | 585 | *flags |= REF_ISPACKED; |
7bd9bcf3 MH |
586 | return 0; |
587 | } | |
419c6f4c MH |
588 | /* refname is not a packed reference. */ |
589 | return -1; | |
7bd9bcf3 MH |
590 | } |
591 | ||
e1e33b72 MH |
592 | static int files_read_raw_ref(struct ref_store *ref_store, |
593 | const char *refname, unsigned char *sha1, | |
594 | struct strbuf *referent, unsigned int *type) | |
7bd9bcf3 | 595 | { |
4308651c | 596 | struct files_ref_store *refs = |
9e7ec634 | 597 | files_downcast(ref_store, REF_STORE_READ, "read_raw_ref"); |
42a38cf7 MH |
598 | struct strbuf sb_contents = STRBUF_INIT; |
599 | struct strbuf sb_path = STRBUF_INIT; | |
7048653a DT |
600 | const char *path; |
601 | const char *buf; | |
602 | struct stat st; | |
603 | int fd; | |
42a38cf7 MH |
604 | int ret = -1; |
605 | int save_errno; | |
e8c42cb9 | 606 | int remaining_retries = 3; |
7bd9bcf3 | 607 | |
fa96ea1b | 608 | *type = 0; |
42a38cf7 | 609 | strbuf_reset(&sb_path); |
34c7ad8f | 610 | |
19e02f4f | 611 | files_ref_path(refs, &sb_path, refname); |
34c7ad8f | 612 | |
42a38cf7 | 613 | path = sb_path.buf; |
7bd9bcf3 | 614 | |
7048653a DT |
615 | stat_ref: |
616 | /* | |
617 | * We might have to loop back here to avoid a race | |
618 | * condition: first we lstat() the file, then we try | |
619 | * to read it as a link or as a file. But if somebody | |
620 | * changes the type of the file (file <-> directory | |
621 | * <-> symlink) between the lstat() and reading, then | |
622 | * we don't want to report that as an error but rather | |
623 | * try again starting with the lstat(). | |
e8c42cb9 JK |
624 | * |
625 | * We'll keep a count of the retries, though, just to avoid | |
626 | * any confusing situation sending us into an infinite loop. | |
7048653a | 627 | */ |
7bd9bcf3 | 628 | |
e8c42cb9 JK |
629 | if (remaining_retries-- <= 0) |
630 | goto out; | |
631 | ||
7048653a DT |
632 | if (lstat(path, &st) < 0) { |
633 | if (errno != ENOENT) | |
42a38cf7 | 634 | goto out; |
611118d0 | 635 | if (resolve_packed_ref(refs, refname, sha1, type)) { |
7048653a | 636 | errno = ENOENT; |
42a38cf7 | 637 | goto out; |
7bd9bcf3 | 638 | } |
42a38cf7 MH |
639 | ret = 0; |
640 | goto out; | |
7bd9bcf3 | 641 | } |
7bd9bcf3 | 642 | |
7048653a DT |
643 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
644 | if (S_ISLNK(st.st_mode)) { | |
42a38cf7 MH |
645 | strbuf_reset(&sb_contents); |
646 | if (strbuf_readlink(&sb_contents, path, 0) < 0) { | |
7048653a | 647 | if (errno == ENOENT || errno == EINVAL) |
7bd9bcf3 MH |
648 | /* inconsistent with lstat; retry */ |
649 | goto stat_ref; | |
650 | else | |
42a38cf7 | 651 | goto out; |
7bd9bcf3 | 652 | } |
42a38cf7 MH |
653 | if (starts_with(sb_contents.buf, "refs/") && |
654 | !check_refname_format(sb_contents.buf, 0)) { | |
92b38093 | 655 | strbuf_swap(&sb_contents, referent); |
3a0b6b9a | 656 | *type |= REF_ISSYMREF; |
42a38cf7 MH |
657 | ret = 0; |
658 | goto out; | |
7bd9bcf3 | 659 | } |
3f7bd767 JK |
660 | /* |
661 | * It doesn't look like a refname; fall through to just | |
662 | * treating it like a non-symlink, and reading whatever it | |
663 | * points to. | |
664 | */ | |
7048653a | 665 | } |
7bd9bcf3 | 666 | |
7048653a DT |
667 | /* Is it a directory? */ |
668 | if (S_ISDIR(st.st_mode)) { | |
e167a567 MH |
669 | /* |
670 | * Even though there is a directory where the loose | |
671 | * ref is supposed to be, there could still be a | |
672 | * packed ref: | |
673 | */ | |
611118d0 | 674 | if (resolve_packed_ref(refs, refname, sha1, type)) { |
e167a567 MH |
675 | errno = EISDIR; |
676 | goto out; | |
677 | } | |
678 | ret = 0; | |
42a38cf7 | 679 | goto out; |
7048653a DT |
680 | } |
681 | ||
682 | /* | |
683 | * Anything else, just open it and try to use it as | |
684 | * a ref | |
685 | */ | |
686 | fd = open(path, O_RDONLY); | |
687 | if (fd < 0) { | |
3f7bd767 | 688 | if (errno == ENOENT && !S_ISLNK(st.st_mode)) |
7048653a DT |
689 | /* inconsistent with lstat; retry */ |
690 | goto stat_ref; | |
691 | else | |
42a38cf7 | 692 | goto out; |
7048653a | 693 | } |
42a38cf7 MH |
694 | strbuf_reset(&sb_contents); |
695 | if (strbuf_read(&sb_contents, fd, 256) < 0) { | |
7048653a DT |
696 | int save_errno = errno; |
697 | close(fd); | |
698 | errno = save_errno; | |
42a38cf7 | 699 | goto out; |
7048653a DT |
700 | } |
701 | close(fd); | |
42a38cf7 MH |
702 | strbuf_rtrim(&sb_contents); |
703 | buf = sb_contents.buf; | |
7048653a DT |
704 | if (starts_with(buf, "ref:")) { |
705 | buf += 4; | |
7bd9bcf3 MH |
706 | while (isspace(*buf)) |
707 | buf++; | |
7048653a | 708 | |
92b38093 MH |
709 | strbuf_reset(referent); |
710 | strbuf_addstr(referent, buf); | |
3a0b6b9a | 711 | *type |= REF_ISSYMREF; |
42a38cf7 MH |
712 | ret = 0; |
713 | goto out; | |
7bd9bcf3 | 714 | } |
7bd9bcf3 | 715 | |
7048653a DT |
716 | /* |
717 | * Please note that FETCH_HEAD has additional | |
718 | * data after the sha. | |
719 | */ | |
720 | if (get_sha1_hex(buf, sha1) || | |
721 | (buf[40] != '\0' && !isspace(buf[40]))) { | |
3a0b6b9a | 722 | *type |= REF_ISBROKEN; |
7048653a | 723 | errno = EINVAL; |
42a38cf7 | 724 | goto out; |
7048653a DT |
725 | } |
726 | ||
42a38cf7 | 727 | ret = 0; |
7bd9bcf3 | 728 | |
42a38cf7 MH |
729 | out: |
730 | save_errno = errno; | |
7bd9bcf3 MH |
731 | strbuf_release(&sb_path); |
732 | strbuf_release(&sb_contents); | |
42a38cf7 | 733 | errno = save_errno; |
7bd9bcf3 MH |
734 | return ret; |
735 | } | |
736 | ||
8415d247 MH |
737 | static void unlock_ref(struct ref_lock *lock) |
738 | { | |
739 | /* Do not free lock->lk -- atexit() still looks at them */ | |
740 | if (lock->lk) | |
741 | rollback_lock_file(lock->lk); | |
742 | free(lock->ref_name); | |
8415d247 MH |
743 | free(lock); |
744 | } | |
745 | ||
92b1551b MH |
746 | /* |
747 | * Lock refname, without following symrefs, and set *lock_p to point | |
748 | * at a newly-allocated lock object. Fill in lock->old_oid, referent, | |
749 | * and type similarly to read_raw_ref(). | |
750 | * | |
751 | * The caller must verify that refname is a "safe" reference name (in | |
752 | * the sense of refname_is_safe()) before calling this function. | |
753 | * | |
754 | * If the reference doesn't already exist, verify that refname doesn't | |
755 | * have a D/F conflict with any existing references. extras and skip | |
524a9fdb | 756 | * are passed to refs_verify_refname_available() for this check. |
92b1551b MH |
757 | * |
758 | * If mustexist is not set and the reference is not found or is | |
759 | * broken, lock the reference anyway but clear sha1. | |
760 | * | |
761 | * Return 0 on success. On failure, write an error message to err and | |
762 | * return TRANSACTION_NAME_CONFLICT or TRANSACTION_GENERIC_ERROR. | |
763 | * | |
764 | * Implementation note: This function is basically | |
765 | * | |
766 | * lock reference | |
767 | * read_raw_ref() | |
768 | * | |
769 | * but it includes a lot more code to | |
770 | * - Deal with possible races with other processes | |
524a9fdb | 771 | * - Avoid calling refs_verify_refname_available() when it can be |
92b1551b MH |
772 | * avoided, namely if we were successfully able to read the ref |
773 | * - Generate informative error messages in the case of failure | |
774 | */ | |
f7b0a987 MH |
775 | static int lock_raw_ref(struct files_ref_store *refs, |
776 | const char *refname, int mustexist, | |
92b1551b MH |
777 | const struct string_list *extras, |
778 | const struct string_list *skip, | |
779 | struct ref_lock **lock_p, | |
780 | struct strbuf *referent, | |
781 | unsigned int *type, | |
782 | struct strbuf *err) | |
783 | { | |
784 | struct ref_lock *lock; | |
785 | struct strbuf ref_file = STRBUF_INIT; | |
786 | int attempts_remaining = 3; | |
787 | int ret = TRANSACTION_GENERIC_ERROR; | |
788 | ||
789 | assert(err); | |
32c597e7 | 790 | files_assert_main_repository(refs, "lock_raw_ref"); |
f7b0a987 | 791 | |
92b1551b MH |
792 | *type = 0; |
793 | ||
794 | /* First lock the file so it can't change out from under us. */ | |
795 | ||
796 | *lock_p = lock = xcalloc(1, sizeof(*lock)); | |
797 | ||
798 | lock->ref_name = xstrdup(refname); | |
19e02f4f | 799 | files_ref_path(refs, &ref_file, refname); |
92b1551b MH |
800 | |
801 | retry: | |
802 | switch (safe_create_leading_directories(ref_file.buf)) { | |
803 | case SCLD_OK: | |
804 | break; /* success */ | |
805 | case SCLD_EXISTS: | |
806 | /* | |
807 | * Suppose refname is "refs/foo/bar". We just failed | |
808 | * to create the containing directory, "refs/foo", | |
809 | * because there was a non-directory in the way. This | |
810 | * indicates a D/F conflict, probably because of | |
811 | * another reference such as "refs/foo". There is no | |
812 | * reason to expect this error to be transitory. | |
813 | */ | |
7d2df051 NTND |
814 | if (refs_verify_refname_available(&refs->base, refname, |
815 | extras, skip, err)) { | |
92b1551b MH |
816 | if (mustexist) { |
817 | /* | |
818 | * To the user the relevant error is | |
819 | * that the "mustexist" reference is | |
820 | * missing: | |
821 | */ | |
822 | strbuf_reset(err); | |
823 | strbuf_addf(err, "unable to resolve reference '%s'", | |
824 | refname); | |
825 | } else { | |
826 | /* | |
827 | * The error message set by | |
524a9fdb MH |
828 | * refs_verify_refname_available() is |
829 | * OK. | |
92b1551b MH |
830 | */ |
831 | ret = TRANSACTION_NAME_CONFLICT; | |
832 | } | |
833 | } else { | |
834 | /* | |
835 | * The file that is in the way isn't a loose | |
836 | * reference. Report it as a low-level | |
837 | * failure. | |
838 | */ | |
839 | strbuf_addf(err, "unable to create lock file %s.lock; " | |
840 | "non-directory in the way", | |
841 | ref_file.buf); | |
842 | } | |
843 | goto error_return; | |
844 | case SCLD_VANISHED: | |
845 | /* Maybe another process was tidying up. Try again. */ | |
846 | if (--attempts_remaining > 0) | |
847 | goto retry; | |
848 | /* fall through */ | |
849 | default: | |
850 | strbuf_addf(err, "unable to create directory for %s", | |
851 | ref_file.buf); | |
852 | goto error_return; | |
853 | } | |
854 | ||
855 | if (!lock->lk) | |
856 | lock->lk = xcalloc(1, sizeof(struct lock_file)); | |
857 | ||
858 | if (hold_lock_file_for_update(lock->lk, ref_file.buf, LOCK_NO_DEREF) < 0) { | |
859 | if (errno == ENOENT && --attempts_remaining > 0) { | |
860 | /* | |
861 | * Maybe somebody just deleted one of the | |
862 | * directories leading to ref_file. Try | |
863 | * again: | |
864 | */ | |
865 | goto retry; | |
866 | } else { | |
867 | unable_to_lock_message(ref_file.buf, errno, err); | |
868 | goto error_return; | |
869 | } | |
870 | } | |
871 | ||
872 | /* | |
873 | * Now we hold the lock and can read the reference without | |
874 | * fear that its value will change. | |
875 | */ | |
876 | ||
f7b0a987 | 877 | if (files_read_raw_ref(&refs->base, refname, |
e1e33b72 | 878 | lock->old_oid.hash, referent, type)) { |
92b1551b MH |
879 | if (errno == ENOENT) { |
880 | if (mustexist) { | |
881 | /* Garden variety missing reference. */ | |
882 | strbuf_addf(err, "unable to resolve reference '%s'", | |
883 | refname); | |
884 | goto error_return; | |
885 | } else { | |
886 | /* | |
887 | * Reference is missing, but that's OK. We | |
888 | * know that there is not a conflict with | |
889 | * another loose reference because | |
890 | * (supposing that we are trying to lock | |
891 | * reference "refs/foo/bar"): | |
892 | * | |
893 | * - We were successfully able to create | |
894 | * the lockfile refs/foo/bar.lock, so we | |
895 | * know there cannot be a loose reference | |
896 | * named "refs/foo". | |
897 | * | |
898 | * - We got ENOENT and not EISDIR, so we | |
899 | * know that there cannot be a loose | |
900 | * reference named "refs/foo/bar/baz". | |
901 | */ | |
902 | } | |
903 | } else if (errno == EISDIR) { | |
904 | /* | |
905 | * There is a directory in the way. It might have | |
906 | * contained references that have been deleted. If | |
907 | * we don't require that the reference already | |
908 | * exists, try to remove the directory so that it | |
909 | * doesn't cause trouble when we want to rename the | |
910 | * lockfile into place later. | |
911 | */ | |
912 | if (mustexist) { | |
913 | /* Garden variety missing reference. */ | |
914 | strbuf_addf(err, "unable to resolve reference '%s'", | |
915 | refname); | |
916 | goto error_return; | |
917 | } else if (remove_dir_recursively(&ref_file, | |
918 | REMOVE_DIR_EMPTY_ONLY)) { | |
b05855b5 MH |
919 | if (refs_verify_refname_available( |
920 | &refs->base, refname, | |
921 | extras, skip, err)) { | |
92b1551b MH |
922 | /* |
923 | * The error message set by | |
924 | * verify_refname_available() is OK. | |
925 | */ | |
926 | ret = TRANSACTION_NAME_CONFLICT; | |
927 | goto error_return; | |
928 | } else { | |
929 | /* | |
930 | * We can't delete the directory, | |
931 | * but we also don't know of any | |
932 | * references that it should | |
933 | * contain. | |
934 | */ | |
935 | strbuf_addf(err, "there is a non-empty directory '%s' " | |
936 | "blocking reference '%s'", | |
937 | ref_file.buf, refname); | |
938 | goto error_return; | |
939 | } | |
940 | } | |
941 | } else if (errno == EINVAL && (*type & REF_ISBROKEN)) { | |
942 | strbuf_addf(err, "unable to resolve reference '%s': " | |
943 | "reference broken", refname); | |
944 | goto error_return; | |
945 | } else { | |
946 | strbuf_addf(err, "unable to resolve reference '%s': %s", | |
947 | refname, strerror(errno)); | |
948 | goto error_return; | |
949 | } | |
950 | ||
951 | /* | |
952 | * If the ref did not exist and we are creating it, | |
524a9fdb MH |
953 | * make sure there is no existing ref that conflicts |
954 | * with refname: | |
92b1551b | 955 | */ |
524a9fdb MH |
956 | if (refs_verify_refname_available( |
957 | &refs->base, refname, | |
958 | extras, skip, err)) | |
92b1551b | 959 | goto error_return; |
92b1551b MH |
960 | } |
961 | ||
962 | ret = 0; | |
963 | goto out; | |
964 | ||
965 | error_return: | |
966 | unlock_ref(lock); | |
967 | *lock_p = NULL; | |
968 | ||
969 | out: | |
970 | strbuf_release(&ref_file); | |
971 | return ret; | |
972 | } | |
973 | ||
bd427cf2 MH |
974 | static int files_peel_ref(struct ref_store *ref_store, |
975 | const char *refname, unsigned char *sha1) | |
7bd9bcf3 | 976 | { |
9e7ec634 NTND |
977 | struct files_ref_store *refs = |
978 | files_downcast(ref_store, REF_STORE_READ | REF_STORE_ODB, | |
979 | "peel_ref"); | |
7bd9bcf3 MH |
980 | int flag; |
981 | unsigned char base[20]; | |
982 | ||
4c4de895 MH |
983 | if (current_ref_iter && current_ref_iter->refname == refname) { |
984 | struct object_id peeled; | |
985 | ||
986 | if (ref_iterator_peel(current_ref_iter, &peeled)) | |
7bd9bcf3 | 987 | return -1; |
4c4de895 | 988 | hashcpy(sha1, peeled.hash); |
7bd9bcf3 MH |
989 | return 0; |
990 | } | |
991 | ||
2f40e954 NTND |
992 | if (refs_read_ref_full(ref_store, refname, |
993 | RESOLVE_REF_READING, base, &flag)) | |
7bd9bcf3 MH |
994 | return -1; |
995 | ||
996 | /* | |
997 | * If the reference is packed, read its ref_entry from the | |
998 | * cache in the hope that we already know its peeled value. | |
999 | * We only try this optimization on packed references because | |
1000 | * (a) forcing the filling of the loose reference cache could | |
1001 | * be expensive and (b) loose references anyway usually do not | |
1002 | * have REF_KNOWS_PEELED. | |
1003 | */ | |
1004 | if (flag & REF_ISPACKED) { | |
f0d21efc | 1005 | struct ref_entry *r = get_packed_ref(refs, refname); |
7bd9bcf3 MH |
1006 | if (r) { |
1007 | if (peel_entry(r, 0)) | |
1008 | return -1; | |
1009 | hashcpy(sha1, r->u.value.peeled.hash); | |
1010 | return 0; | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | return peel_object(base, sha1); | |
1015 | } | |
1016 | ||
3bc581b9 MH |
1017 | struct files_ref_iterator { |
1018 | struct ref_iterator base; | |
1019 | ||
7bd9bcf3 | 1020 | struct packed_ref_cache *packed_ref_cache; |
3bc581b9 MH |
1021 | struct ref_iterator *iter0; |
1022 | unsigned int flags; | |
1023 | }; | |
7bd9bcf3 | 1024 | |
3bc581b9 MH |
1025 | static int files_ref_iterator_advance(struct ref_iterator *ref_iterator) |
1026 | { | |
1027 | struct files_ref_iterator *iter = | |
1028 | (struct files_ref_iterator *)ref_iterator; | |
1029 | int ok; | |
7bd9bcf3 | 1030 | |
3bc581b9 | 1031 | while ((ok = ref_iterator_advance(iter->iter0)) == ITER_OK) { |
0c09ec07 DT |
1032 | if (iter->flags & DO_FOR_EACH_PER_WORKTREE_ONLY && |
1033 | ref_type(iter->iter0->refname) != REF_TYPE_PER_WORKTREE) | |
1034 | continue; | |
1035 | ||
3bc581b9 MH |
1036 | if (!(iter->flags & DO_FOR_EACH_INCLUDE_BROKEN) && |
1037 | !ref_resolves_to_object(iter->iter0->refname, | |
1038 | iter->iter0->oid, | |
1039 | iter->iter0->flags)) | |
1040 | continue; | |
1041 | ||
1042 | iter->base.refname = iter->iter0->refname; | |
1043 | iter->base.oid = iter->iter0->oid; | |
1044 | iter->base.flags = iter->iter0->flags; | |
1045 | return ITER_OK; | |
7bd9bcf3 MH |
1046 | } |
1047 | ||
3bc581b9 MH |
1048 | iter->iter0 = NULL; |
1049 | if (ref_iterator_abort(ref_iterator) != ITER_DONE) | |
1050 | ok = ITER_ERROR; | |
1051 | ||
1052 | return ok; | |
7bd9bcf3 MH |
1053 | } |
1054 | ||
3bc581b9 MH |
1055 | static int files_ref_iterator_peel(struct ref_iterator *ref_iterator, |
1056 | struct object_id *peeled) | |
7bd9bcf3 | 1057 | { |
3bc581b9 MH |
1058 | struct files_ref_iterator *iter = |
1059 | (struct files_ref_iterator *)ref_iterator; | |
93770590 | 1060 | |
3bc581b9 MH |
1061 | return ref_iterator_peel(iter->iter0, peeled); |
1062 | } | |
1063 | ||
1064 | static int files_ref_iterator_abort(struct ref_iterator *ref_iterator) | |
1065 | { | |
1066 | struct files_ref_iterator *iter = | |
1067 | (struct files_ref_iterator *)ref_iterator; | |
1068 | int ok = ITER_DONE; | |
1069 | ||
1070 | if (iter->iter0) | |
1071 | ok = ref_iterator_abort(iter->iter0); | |
1072 | ||
1073 | release_packed_ref_cache(iter->packed_ref_cache); | |
1074 | base_ref_iterator_free(ref_iterator); | |
1075 | return ok; | |
1076 | } | |
1077 | ||
1078 | static struct ref_iterator_vtable files_ref_iterator_vtable = { | |
1079 | files_ref_iterator_advance, | |
1080 | files_ref_iterator_peel, | |
1081 | files_ref_iterator_abort | |
1082 | }; | |
1083 | ||
1a769003 | 1084 | static struct ref_iterator *files_ref_iterator_begin( |
37b6f6d5 | 1085 | struct ref_store *ref_store, |
3bc581b9 MH |
1086 | const char *prefix, unsigned int flags) |
1087 | { | |
9e7ec634 | 1088 | struct files_ref_store *refs; |
3bc581b9 MH |
1089 | struct ref_iterator *loose_iter, *packed_iter; |
1090 | struct files_ref_iterator *iter; | |
1091 | struct ref_iterator *ref_iterator; | |
0a0865b8 | 1092 | unsigned int required_flags = REF_STORE_READ; |
3bc581b9 | 1093 | |
0a0865b8 MH |
1094 | if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) |
1095 | required_flags |= REF_STORE_ODB; | |
3bc581b9 | 1096 | |
0a0865b8 | 1097 | refs = files_downcast(ref_store, required_flags, "ref_iterator_begin"); |
9e7ec634 | 1098 | |
3bc581b9 MH |
1099 | iter = xcalloc(1, sizeof(*iter)); |
1100 | ref_iterator = &iter->base; | |
1101 | base_ref_iterator_init(ref_iterator, &files_ref_iterator_vtable); | |
1102 | ||
1103 | /* | |
1104 | * We must make sure that all loose refs are read before | |
1105 | * accessing the packed-refs file; this avoids a race | |
1106 | * condition if loose refs are migrated to the packed-refs | |
1107 | * file by a simultaneous process, but our in-memory view is | |
1108 | * from before the migration. We ensure this as follows: | |
059ae35a MH |
1109 | * First, we call start the loose refs iteration with its |
1110 | * `prime_ref` argument set to true. This causes the loose | |
1111 | * references in the subtree to be pre-read into the cache. | |
1112 | * (If they've already been read, that's OK; we only need to | |
1113 | * guarantee that they're read before the packed refs, not | |
1114 | * *how much* before.) After that, we call | |
1115 | * get_packed_ref_cache(), which internally checks whether the | |
1116 | * packed-ref cache is up to date with what is on disk, and | |
1117 | * re-reads it if not. | |
3bc581b9 MH |
1118 | */ |
1119 | ||
059ae35a MH |
1120 | loose_iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), |
1121 | prefix, 1); | |
3bc581b9 MH |
1122 | |
1123 | iter->packed_ref_cache = get_packed_ref_cache(refs); | |
1124 | acquire_packed_ref_cache(iter->packed_ref_cache); | |
059ae35a MH |
1125 | packed_iter = cache_ref_iterator_begin(iter->packed_ref_cache->cache, |
1126 | prefix, 0); | |
3bc581b9 MH |
1127 | |
1128 | iter->iter0 = overlay_ref_iterator_begin(loose_iter, packed_iter); | |
1129 | iter->flags = flags; | |
1130 | ||
1131 | return ref_iterator; | |
7bd9bcf3 MH |
1132 | } |
1133 | ||
7bd9bcf3 MH |
1134 | /* |
1135 | * Verify that the reference locked by lock has the value old_sha1. | |
1136 | * Fail if the reference doesn't exist and mustexist is set. Return 0 | |
1137 | * on success. On error, write an error message to err, set errno, and | |
1138 | * return a negative value. | |
1139 | */ | |
2f40e954 | 1140 | static int verify_lock(struct ref_store *ref_store, struct ref_lock *lock, |
7bd9bcf3 MH |
1141 | const unsigned char *old_sha1, int mustexist, |
1142 | struct strbuf *err) | |
1143 | { | |
1144 | assert(err); | |
1145 | ||
2f40e954 NTND |
1146 | if (refs_read_ref_full(ref_store, lock->ref_name, |
1147 | mustexist ? RESOLVE_REF_READING : 0, | |
1148 | lock->old_oid.hash, NULL)) { | |
6294dcb4 JK |
1149 | if (old_sha1) { |
1150 | int save_errno = errno; | |
0568c8e9 | 1151 | strbuf_addf(err, "can't verify ref '%s'", lock->ref_name); |
6294dcb4 JK |
1152 | errno = save_errno; |
1153 | return -1; | |
1154 | } else { | |
c368dde9 | 1155 | oidclr(&lock->old_oid); |
6294dcb4 JK |
1156 | return 0; |
1157 | } | |
7bd9bcf3 | 1158 | } |
6294dcb4 | 1159 | if (old_sha1 && hashcmp(lock->old_oid.hash, old_sha1)) { |
0568c8e9 | 1160 | strbuf_addf(err, "ref '%s' is at %s but expected %s", |
7bd9bcf3 | 1161 | lock->ref_name, |
c368dde9 | 1162 | oid_to_hex(&lock->old_oid), |
7bd9bcf3 MH |
1163 | sha1_to_hex(old_sha1)); |
1164 | errno = EBUSY; | |
1165 | return -1; | |
1166 | } | |
1167 | return 0; | |
1168 | } | |
1169 | ||
1170 | static int remove_empty_directories(struct strbuf *path) | |
1171 | { | |
1172 | /* | |
1173 | * we want to create a file but there is a directory there; | |
1174 | * if that is an empty directory (or a directory that contains | |
1175 | * only empty directories), remove them. | |
1176 | */ | |
1177 | return remove_dir_recursively(path, REMOVE_DIR_EMPTY_ONLY); | |
1178 | } | |
1179 | ||
3b5d3c98 MH |
1180 | static int create_reflock(const char *path, void *cb) |
1181 | { | |
1182 | struct lock_file *lk = cb; | |
1183 | ||
1184 | return hold_lock_file_for_update(lk, path, LOCK_NO_DEREF) < 0 ? -1 : 0; | |
1185 | } | |
1186 | ||
7bd9bcf3 MH |
1187 | /* |
1188 | * Locks a ref returning the lock on success and NULL on failure. | |
1189 | * On failure errno is set to something meaningful. | |
1190 | */ | |
7eb27cdf MH |
1191 | static struct ref_lock *lock_ref_sha1_basic(struct files_ref_store *refs, |
1192 | const char *refname, | |
7bd9bcf3 MH |
1193 | const unsigned char *old_sha1, |
1194 | const struct string_list *extras, | |
1195 | const struct string_list *skip, | |
bcb497d0 | 1196 | unsigned int flags, int *type, |
7bd9bcf3 MH |
1197 | struct strbuf *err) |
1198 | { | |
1199 | struct strbuf ref_file = STRBUF_INIT; | |
7bd9bcf3 MH |
1200 | struct ref_lock *lock; |
1201 | int last_errno = 0; | |
7bd9bcf3 | 1202 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
7a418f3a | 1203 | int resolve_flags = RESOLVE_REF_NO_RECURSE; |
7a418f3a | 1204 | int resolved; |
7bd9bcf3 | 1205 | |
32c597e7 | 1206 | files_assert_main_repository(refs, "lock_ref_sha1_basic"); |
7bd9bcf3 MH |
1207 | assert(err); |
1208 | ||
1209 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
1210 | ||
1211 | if (mustexist) | |
1212 | resolve_flags |= RESOLVE_REF_READING; | |
2859dcd4 | 1213 | if (flags & REF_DELETING) |
7bd9bcf3 | 1214 | resolve_flags |= RESOLVE_REF_ALLOW_BAD_NAME; |
7bd9bcf3 | 1215 | |
19e02f4f | 1216 | files_ref_path(refs, &ref_file, refname); |
2f40e954 NTND |
1217 | resolved = !!refs_resolve_ref_unsafe(&refs->base, |
1218 | refname, resolve_flags, | |
1219 | lock->old_oid.hash, type); | |
7a418f3a | 1220 | if (!resolved && errno == EISDIR) { |
7bd9bcf3 MH |
1221 | /* |
1222 | * we are trying to lock foo but we used to | |
1223 | * have foo/bar which now does not exist; | |
1224 | * it is normal for the empty directory 'foo' | |
1225 | * to remain. | |
1226 | */ | |
7a418f3a | 1227 | if (remove_empty_directories(&ref_file)) { |
7bd9bcf3 | 1228 | last_errno = errno; |
b05855b5 MH |
1229 | if (!refs_verify_refname_available( |
1230 | &refs->base, | |
1231 | refname, extras, skip, err)) | |
7bd9bcf3 | 1232 | strbuf_addf(err, "there are still refs under '%s'", |
7a418f3a | 1233 | refname); |
7bd9bcf3 MH |
1234 | goto error_return; |
1235 | } | |
2f40e954 NTND |
1236 | resolved = !!refs_resolve_ref_unsafe(&refs->base, |
1237 | refname, resolve_flags, | |
1238 | lock->old_oid.hash, type); | |
7bd9bcf3 | 1239 | } |
7a418f3a | 1240 | if (!resolved) { |
7bd9bcf3 MH |
1241 | last_errno = errno; |
1242 | if (last_errno != ENOTDIR || | |
b05855b5 MH |
1243 | !refs_verify_refname_available(&refs->base, refname, |
1244 | extras, skip, err)) | |
0568c8e9 | 1245 | strbuf_addf(err, "unable to resolve reference '%s': %s", |
7a418f3a | 1246 | refname, strerror(last_errno)); |
7bd9bcf3 MH |
1247 | |
1248 | goto error_return; | |
1249 | } | |
2859dcd4 | 1250 | |
7bd9bcf3 MH |
1251 | /* |
1252 | * If the ref did not exist and we are creating it, make sure | |
1253 | * there is no existing packed ref whose name begins with our | |
1254 | * refname, nor a packed ref whose name is a proper prefix of | |
1255 | * our refname. | |
1256 | */ | |
1257 | if (is_null_oid(&lock->old_oid) && | |
524a9fdb MH |
1258 | refs_verify_refname_available(&refs->base, refname, |
1259 | extras, skip, err)) { | |
7bd9bcf3 MH |
1260 | last_errno = ENOTDIR; |
1261 | goto error_return; | |
1262 | } | |
1263 | ||
1264 | lock->lk = xcalloc(1, sizeof(struct lock_file)); | |
1265 | ||
7bd9bcf3 | 1266 | lock->ref_name = xstrdup(refname); |
7bd9bcf3 | 1267 | |
3b5d3c98 | 1268 | if (raceproof_create_file(ref_file.buf, create_reflock, lock->lk)) { |
7bd9bcf3 | 1269 | last_errno = errno; |
3b5d3c98 | 1270 | unable_to_lock_message(ref_file.buf, errno, err); |
7bd9bcf3 MH |
1271 | goto error_return; |
1272 | } | |
1273 | ||
2f40e954 | 1274 | if (verify_lock(&refs->base, lock, old_sha1, mustexist, err)) { |
7bd9bcf3 MH |
1275 | last_errno = errno; |
1276 | goto error_return; | |
1277 | } | |
1278 | goto out; | |
1279 | ||
1280 | error_return: | |
1281 | unlock_ref(lock); | |
1282 | lock = NULL; | |
1283 | ||
1284 | out: | |
1285 | strbuf_release(&ref_file); | |
7bd9bcf3 MH |
1286 | errno = last_errno; |
1287 | return lock; | |
1288 | } | |
1289 | ||
1290 | /* | |
1291 | * Write an entry to the packed-refs file for the specified refname. | |
1292 | * If peeled is non-NULL, write it as the entry's peeled value. | |
1293 | */ | |
1710fbaf MH |
1294 | static void write_packed_entry(FILE *fh, const char *refname, |
1295 | const unsigned char *sha1, | |
1296 | const unsigned char *peeled) | |
7bd9bcf3 MH |
1297 | { |
1298 | fprintf_or_die(fh, "%s %s\n", sha1_to_hex(sha1), refname); | |
1299 | if (peeled) | |
1300 | fprintf_or_die(fh, "^%s\n", sha1_to_hex(peeled)); | |
1301 | } | |
1302 | ||
7bd9bcf3 MH |
1303 | /* |
1304 | * Lock the packed-refs file for writing. Flags is passed to | |
1305 | * hold_lock_file_for_update(). Return 0 on success. On errors, set | |
1306 | * errno appropriately and return a nonzero value. | |
1307 | */ | |
49c0df6a | 1308 | static int lock_packed_refs(struct files_ref_store *refs, int flags) |
7bd9bcf3 MH |
1309 | { |
1310 | static int timeout_configured = 0; | |
1311 | static int timeout_value = 1000; | |
7bd9bcf3 MH |
1312 | struct packed_ref_cache *packed_ref_cache; |
1313 | ||
32c597e7 | 1314 | files_assert_main_repository(refs, "lock_packed_refs"); |
49c0df6a | 1315 | |
7bd9bcf3 MH |
1316 | if (!timeout_configured) { |
1317 | git_config_get_int("core.packedrefstimeout", &timeout_value); | |
1318 | timeout_configured = 1; | |
1319 | } | |
1320 | ||
1321 | if (hold_lock_file_for_update_timeout( | |
00d17448 | 1322 | &refs->packed_refs_lock, files_packed_refs_path(refs), |
7bd9bcf3 MH |
1323 | flags, timeout_value) < 0) |
1324 | return -1; | |
fed6ebeb | 1325 | |
7bd9bcf3 | 1326 | /* |
fed6ebeb MH |
1327 | * Now that we hold the `packed-refs` lock, make sure that our |
1328 | * cache matches the current version of the file. Normally | |
1329 | * `get_packed_ref_cache()` does that for us, but that | |
1330 | * function assumes that when the file is locked, any existing | |
1331 | * cache is still valid. We've just locked the file, but it | |
1332 | * might have changed the moment *before* we locked it. | |
7bd9bcf3 | 1333 | */ |
fed6ebeb MH |
1334 | validate_packed_ref_cache(refs); |
1335 | ||
00eebe35 | 1336 | packed_ref_cache = get_packed_ref_cache(refs); |
7bd9bcf3 MH |
1337 | /* Increment the reference count to prevent it from being freed: */ |
1338 | acquire_packed_ref_cache(packed_ref_cache); | |
1339 | return 0; | |
1340 | } | |
1341 | ||
1342 | /* | |
1343 | * Write the current version of the packed refs cache from memory to | |
1344 | * disk. The packed-refs file must already be locked for writing (see | |
1345 | * lock_packed_refs()). Return zero on success. On errors, set errno | |
1346 | * and return a nonzero value | |
1347 | */ | |
49c0df6a | 1348 | static int commit_packed_refs(struct files_ref_store *refs) |
7bd9bcf3 MH |
1349 | { |
1350 | struct packed_ref_cache *packed_ref_cache = | |
00eebe35 | 1351 | get_packed_ref_cache(refs); |
1710fbaf | 1352 | int ok, error = 0; |
7bd9bcf3 MH |
1353 | int save_errno = 0; |
1354 | FILE *out; | |
1710fbaf | 1355 | struct ref_iterator *iter; |
7bd9bcf3 | 1356 | |
32c597e7 | 1357 | files_assert_main_repository(refs, "commit_packed_refs"); |
49c0df6a | 1358 | |
00d17448 | 1359 | if (!is_lock_file_locked(&refs->packed_refs_lock)) |
04aea8d4 | 1360 | die("BUG: packed-refs not locked"); |
7bd9bcf3 | 1361 | |
00d17448 | 1362 | out = fdopen_lock_file(&refs->packed_refs_lock, "w"); |
7bd9bcf3 MH |
1363 | if (!out) |
1364 | die_errno("unable to fdopen packed-refs descriptor"); | |
1365 | ||
1366 | fprintf_or_die(out, "%s", PACKED_REFS_HEADER); | |
1710fbaf MH |
1367 | |
1368 | iter = cache_ref_iterator_begin(packed_ref_cache->cache, NULL, 0); | |
1369 | while ((ok = ref_iterator_advance(iter)) == ITER_OK) { | |
1370 | struct object_id peeled; | |
1371 | int peel_error = ref_iterator_peel(iter, &peeled); | |
1372 | ||
1373 | write_packed_entry(out, iter->refname, iter->oid->hash, | |
1374 | peel_error ? NULL : peeled.hash); | |
1375 | } | |
1376 | ||
1377 | if (ok != ITER_DONE) | |
1378 | die("error while iterating over references"); | |
7bd9bcf3 | 1379 | |
00d17448 | 1380 | if (commit_lock_file(&refs->packed_refs_lock)) { |
7bd9bcf3 MH |
1381 | save_errno = errno; |
1382 | error = -1; | |
1383 | } | |
7bd9bcf3 MH |
1384 | release_packed_ref_cache(packed_ref_cache); |
1385 | errno = save_errno; | |
1386 | return error; | |
1387 | } | |
1388 | ||
1389 | /* | |
1390 | * Rollback the lockfile for the packed-refs file, and discard the | |
1391 | * in-memory packed reference cache. (The packed-refs file will be | |
1392 | * read anew if it is needed again after this function is called.) | |
1393 | */ | |
49c0df6a | 1394 | static void rollback_packed_refs(struct files_ref_store *refs) |
7bd9bcf3 MH |
1395 | { |
1396 | struct packed_ref_cache *packed_ref_cache = | |
00eebe35 | 1397 | get_packed_ref_cache(refs); |
7bd9bcf3 | 1398 | |
32c597e7 | 1399 | files_assert_main_repository(refs, "rollback_packed_refs"); |
7bd9bcf3 | 1400 | |
00d17448 | 1401 | if (!is_lock_file_locked(&refs->packed_refs_lock)) |
04aea8d4 | 1402 | die("BUG: packed-refs not locked"); |
00d17448 | 1403 | rollback_lock_file(&refs->packed_refs_lock); |
7bd9bcf3 | 1404 | release_packed_ref_cache(packed_ref_cache); |
00eebe35 | 1405 | clear_packed_ref_cache(refs); |
7bd9bcf3 MH |
1406 | } |
1407 | ||
1408 | struct ref_to_prune { | |
1409 | struct ref_to_prune *next; | |
1410 | unsigned char sha1[20]; | |
1411 | char name[FLEX_ARRAY]; | |
1412 | }; | |
1413 | ||
a8f0db2d MH |
1414 | enum { |
1415 | REMOVE_EMPTY_PARENTS_REF = 0x01, | |
1416 | REMOVE_EMPTY_PARENTS_REFLOG = 0x02 | |
1417 | }; | |
1418 | ||
7bd9bcf3 | 1419 | /* |
a8f0db2d MH |
1420 | * Remove empty parent directories associated with the specified |
1421 | * reference and/or its reflog, but spare [logs/]refs/ and immediate | |
1422 | * subdirs. flags is a combination of REMOVE_EMPTY_PARENTS_REF and/or | |
1423 | * REMOVE_EMPTY_PARENTS_REFLOG. | |
7bd9bcf3 | 1424 | */ |
802de3da NTND |
1425 | static void try_remove_empty_parents(struct files_ref_store *refs, |
1426 | const char *refname, | |
1427 | unsigned int flags) | |
7bd9bcf3 | 1428 | { |
8bdaecb4 | 1429 | struct strbuf buf = STRBUF_INIT; |
e9dcc305 | 1430 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 MH |
1431 | char *p, *q; |
1432 | int i; | |
8bdaecb4 MH |
1433 | |
1434 | strbuf_addstr(&buf, refname); | |
1435 | p = buf.buf; | |
7bd9bcf3 MH |
1436 | for (i = 0; i < 2; i++) { /* refs/{heads,tags,...}/ */ |
1437 | while (*p && *p != '/') | |
1438 | p++; | |
1439 | /* tolerate duplicate slashes; see check_refname_format() */ | |
1440 | while (*p == '/') | |
1441 | p++; | |
1442 | } | |
8bdaecb4 | 1443 | q = buf.buf + buf.len; |
a8f0db2d | 1444 | while (flags & (REMOVE_EMPTY_PARENTS_REF | REMOVE_EMPTY_PARENTS_REFLOG)) { |
7bd9bcf3 MH |
1445 | while (q > p && *q != '/') |
1446 | q--; | |
1447 | while (q > p && *(q-1) == '/') | |
1448 | q--; | |
1449 | if (q == p) | |
1450 | break; | |
8bdaecb4 | 1451 | strbuf_setlen(&buf, q - buf.buf); |
e9dcc305 NTND |
1452 | |
1453 | strbuf_reset(&sb); | |
19e02f4f | 1454 | files_ref_path(refs, &sb, buf.buf); |
e9dcc305 | 1455 | if ((flags & REMOVE_EMPTY_PARENTS_REF) && rmdir(sb.buf)) |
a8f0db2d | 1456 | flags &= ~REMOVE_EMPTY_PARENTS_REF; |
e9dcc305 NTND |
1457 | |
1458 | strbuf_reset(&sb); | |
802de3da | 1459 | files_reflog_path(refs, &sb, buf.buf); |
e9dcc305 | 1460 | if ((flags & REMOVE_EMPTY_PARENTS_REFLOG) && rmdir(sb.buf)) |
a8f0db2d | 1461 | flags &= ~REMOVE_EMPTY_PARENTS_REFLOG; |
7bd9bcf3 | 1462 | } |
8bdaecb4 | 1463 | strbuf_release(&buf); |
e9dcc305 | 1464 | strbuf_release(&sb); |
7bd9bcf3 MH |
1465 | } |
1466 | ||
1467 | /* make sure nobody touched the ref, and unlink */ | |
2f40e954 | 1468 | static void prune_ref(struct files_ref_store *refs, struct ref_to_prune *r) |
7bd9bcf3 MH |
1469 | { |
1470 | struct ref_transaction *transaction; | |
1471 | struct strbuf err = STRBUF_INIT; | |
1472 | ||
1473 | if (check_refname_format(r->name, 0)) | |
1474 | return; | |
1475 | ||
2f40e954 | 1476 | transaction = ref_store_transaction_begin(&refs->base, &err); |
7bd9bcf3 MH |
1477 | if (!transaction || |
1478 | ref_transaction_delete(transaction, r->name, r->sha1, | |
c52ce248 | 1479 | REF_ISPRUNING | REF_NODEREF, NULL, &err) || |
7bd9bcf3 MH |
1480 | ref_transaction_commit(transaction, &err)) { |
1481 | ref_transaction_free(transaction); | |
1482 | error("%s", err.buf); | |
1483 | strbuf_release(&err); | |
1484 | return; | |
1485 | } | |
1486 | ref_transaction_free(transaction); | |
1487 | strbuf_release(&err); | |
7bd9bcf3 MH |
1488 | } |
1489 | ||
2f40e954 | 1490 | static void prune_refs(struct files_ref_store *refs, struct ref_to_prune *r) |
7bd9bcf3 MH |
1491 | { |
1492 | while (r) { | |
2f40e954 | 1493 | prune_ref(refs, r); |
7bd9bcf3 MH |
1494 | r = r->next; |
1495 | } | |
1496 | } | |
1497 | ||
531cc4a5 MH |
1498 | /* |
1499 | * Return true if the specified reference should be packed. | |
1500 | */ | |
1501 | static int should_pack_ref(const char *refname, | |
1502 | const struct object_id *oid, unsigned int ref_flags, | |
1503 | unsigned int pack_flags) | |
1504 | { | |
1505 | /* Do not pack per-worktree refs: */ | |
1506 | if (ref_type(refname) != REF_TYPE_NORMAL) | |
1507 | return 0; | |
1508 | ||
1509 | /* Do not pack non-tags unless PACK_REFS_ALL is set: */ | |
1510 | if (!(pack_flags & PACK_REFS_ALL) && !starts_with(refname, "refs/tags/")) | |
1511 | return 0; | |
1512 | ||
1513 | /* Do not pack symbolic refs: */ | |
1514 | if (ref_flags & REF_ISSYMREF) | |
1515 | return 0; | |
1516 | ||
1517 | /* Do not pack broken refs: */ | |
1518 | if (!ref_resolves_to_object(refname, oid, ref_flags)) | |
1519 | return 0; | |
1520 | ||
1521 | return 1; | |
1522 | } | |
1523 | ||
8231527e | 1524 | static int files_pack_refs(struct ref_store *ref_store, unsigned int flags) |
7bd9bcf3 | 1525 | { |
00eebe35 | 1526 | struct files_ref_store *refs = |
9e7ec634 NTND |
1527 | files_downcast(ref_store, REF_STORE_WRITE | REF_STORE_ODB, |
1528 | "pack_refs"); | |
50c2d855 MH |
1529 | struct ref_iterator *iter; |
1530 | struct ref_dir *packed_refs; | |
1531 | int ok; | |
1532 | struct ref_to_prune *refs_to_prune = NULL; | |
7bd9bcf3 | 1533 | |
49c0df6a | 1534 | lock_packed_refs(refs, LOCK_DIE_ON_ERROR); |
50c2d855 MH |
1535 | packed_refs = get_packed_refs(refs); |
1536 | ||
1537 | iter = cache_ref_iterator_begin(get_loose_ref_cache(refs), NULL, 0); | |
1538 | while ((ok = ref_iterator_advance(iter)) == ITER_OK) { | |
1539 | /* | |
1540 | * If the loose reference can be packed, add an entry | |
1541 | * in the packed ref cache. If the reference should be | |
1542 | * pruned, also add it to refs_to_prune. | |
1543 | */ | |
1544 | struct ref_entry *packed_entry; | |
7bd9bcf3 | 1545 | |
531cc4a5 MH |
1546 | if (!should_pack_ref(iter->refname, iter->oid, iter->flags, |
1547 | flags)) | |
50c2d855 MH |
1548 | continue; |
1549 | ||
1550 | /* | |
1551 | * Create an entry in the packed-refs cache equivalent | |
1552 | * to the one from the loose ref cache, except that | |
1553 | * we don't copy the peeled status, because we want it | |
1554 | * to be re-peeled. | |
1555 | */ | |
1556 | packed_entry = find_ref_entry(packed_refs, iter->refname); | |
1557 | if (packed_entry) { | |
1558 | /* Overwrite existing packed entry with info from loose entry */ | |
1559 | packed_entry->flag = REF_ISPACKED; | |
1560 | oidcpy(&packed_entry->u.value.oid, iter->oid); | |
1561 | } else { | |
4417df8c | 1562 | packed_entry = create_ref_entry(iter->refname, iter->oid, |
c1da06c6 | 1563 | REF_ISPACKED); |
50c2d855 MH |
1564 | add_ref_entry(packed_refs, packed_entry); |
1565 | } | |
1566 | oidclr(&packed_entry->u.value.peeled); | |
1567 | ||
1568 | /* Schedule the loose reference for pruning if requested. */ | |
1569 | if ((flags & PACK_REFS_PRUNE)) { | |
1570 | struct ref_to_prune *n; | |
1571 | FLEX_ALLOC_STR(n, name, iter->refname); | |
1572 | hashcpy(n->sha1, iter->oid->hash); | |
1573 | n->next = refs_to_prune; | |
1574 | refs_to_prune = n; | |
1575 | } | |
1576 | } | |
1577 | if (ok != ITER_DONE) | |
1578 | die("error while iterating over references"); | |
7bd9bcf3 | 1579 | |
49c0df6a | 1580 | if (commit_packed_refs(refs)) |
7bd9bcf3 MH |
1581 | die_errno("unable to overwrite old ref-pack file"); |
1582 | ||
50c2d855 | 1583 | prune_refs(refs, refs_to_prune); |
7bd9bcf3 MH |
1584 | return 0; |
1585 | } | |
1586 | ||
1587 | /* | |
1588 | * Rewrite the packed-refs file, omitting any refs listed in | |
1589 | * 'refnames'. On error, leave packed-refs unchanged, write an error | |
1590 | * message to 'err', and return a nonzero value. | |
1591 | * | |
1592 | * The refs in 'refnames' needn't be sorted. `err` must not be NULL. | |
1593 | */ | |
0a95ac5f MH |
1594 | static int repack_without_refs(struct files_ref_store *refs, |
1595 | struct string_list *refnames, struct strbuf *err) | |
7bd9bcf3 MH |
1596 | { |
1597 | struct ref_dir *packed; | |
1598 | struct string_list_item *refname; | |
1599 | int ret, needs_repacking = 0, removed = 0; | |
1600 | ||
32c597e7 | 1601 | files_assert_main_repository(refs, "repack_without_refs"); |
7bd9bcf3 MH |
1602 | assert(err); |
1603 | ||
1604 | /* Look for a packed ref */ | |
1605 | for_each_string_list_item(refname, refnames) { | |
f0d21efc | 1606 | if (get_packed_ref(refs, refname->string)) { |
7bd9bcf3 MH |
1607 | needs_repacking = 1; |
1608 | break; | |
1609 | } | |
1610 | } | |
1611 | ||
1612 | /* Avoid locking if we have nothing to do */ | |
1613 | if (!needs_repacking) | |
1614 | return 0; /* no refname exists in packed refs */ | |
1615 | ||
49c0df6a | 1616 | if (lock_packed_refs(refs, 0)) { |
33dfb9f3 | 1617 | unable_to_lock_message(files_packed_refs_path(refs), errno, err); |
7bd9bcf3 MH |
1618 | return -1; |
1619 | } | |
00eebe35 | 1620 | packed = get_packed_refs(refs); |
7bd9bcf3 MH |
1621 | |
1622 | /* Remove refnames from the cache */ | |
1623 | for_each_string_list_item(refname, refnames) | |
9fc3b063 | 1624 | if (remove_entry_from_dir(packed, refname->string) != -1) |
7bd9bcf3 MH |
1625 | removed = 1; |
1626 | if (!removed) { | |
1627 | /* | |
1628 | * All packed entries disappeared while we were | |
1629 | * acquiring the lock. | |
1630 | */ | |
49c0df6a | 1631 | rollback_packed_refs(refs); |
7bd9bcf3 MH |
1632 | return 0; |
1633 | } | |
1634 | ||
1635 | /* Write what remains */ | |
49c0df6a | 1636 | ret = commit_packed_refs(refs); |
7bd9bcf3 MH |
1637 | if (ret) |
1638 | strbuf_addf(err, "unable to overwrite old ref-pack file: %s", | |
1639 | strerror(errno)); | |
1640 | return ret; | |
1641 | } | |
1642 | ||
64da4199 | 1643 | static int files_delete_refs(struct ref_store *ref_store, const char *msg, |
a27dcf89 | 1644 | struct string_list *refnames, unsigned int flags) |
7bd9bcf3 | 1645 | { |
0a95ac5f | 1646 | struct files_ref_store *refs = |
9e7ec634 | 1647 | files_downcast(ref_store, REF_STORE_WRITE, "delete_refs"); |
7bd9bcf3 MH |
1648 | struct strbuf err = STRBUF_INIT; |
1649 | int i, result = 0; | |
1650 | ||
1651 | if (!refnames->nr) | |
1652 | return 0; | |
1653 | ||
0a95ac5f | 1654 | result = repack_without_refs(refs, refnames, &err); |
7bd9bcf3 MH |
1655 | if (result) { |
1656 | /* | |
1657 | * If we failed to rewrite the packed-refs file, then | |
1658 | * it is unsafe to try to remove loose refs, because | |
1659 | * doing so might expose an obsolete packed value for | |
1660 | * a reference that might even point at an object that | |
1661 | * has been garbage collected. | |
1662 | */ | |
1663 | if (refnames->nr == 1) | |
1664 | error(_("could not delete reference %s: %s"), | |
1665 | refnames->items[0].string, err.buf); | |
1666 | else | |
1667 | error(_("could not delete references: %s"), err.buf); | |
1668 | ||
1669 | goto out; | |
1670 | } | |
1671 | ||
1672 | for (i = 0; i < refnames->nr; i++) { | |
1673 | const char *refname = refnames->items[i].string; | |
1674 | ||
64da4199 | 1675 | if (refs_delete_ref(&refs->base, msg, refname, NULL, flags)) |
7bd9bcf3 MH |
1676 | result |= error(_("could not remove reference %s"), refname); |
1677 | } | |
1678 | ||
1679 | out: | |
1680 | strbuf_release(&err); | |
1681 | return result; | |
1682 | } | |
1683 | ||
1684 | /* | |
1685 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
1686 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
1687 | * | |
1688 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
1689 | * live into logs/refs. | |
1690 | */ | |
a5c1efd6 | 1691 | #define TMP_RENAMED_LOG "refs/.tmp-renamed-log" |
7bd9bcf3 | 1692 | |
e9dcc305 NTND |
1693 | struct rename_cb { |
1694 | const char *tmp_renamed_log; | |
1695 | int true_errno; | |
1696 | }; | |
1697 | ||
1698 | static int rename_tmp_log_callback(const char *path, void *cb_data) | |
7bd9bcf3 | 1699 | { |
e9dcc305 | 1700 | struct rename_cb *cb = cb_data; |
7bd9bcf3 | 1701 | |
e9dcc305 | 1702 | if (rename(cb->tmp_renamed_log, path)) { |
6a7f3631 MH |
1703 | /* |
1704 | * rename(a, b) when b is an existing directory ought | |
1705 | * to result in ISDIR, but Solaris 5.8 gives ENOTDIR. | |
1706 | * Sheesh. Record the true errno for error reporting, | |
1707 | * but report EISDIR to raceproof_create_file() so | |
1708 | * that it knows to retry. | |
1709 | */ | |
e9dcc305 | 1710 | cb->true_errno = errno; |
6a7f3631 MH |
1711 | if (errno == ENOTDIR) |
1712 | errno = EISDIR; | |
1713 | return -1; | |
1714 | } else { | |
1715 | return 0; | |
7bd9bcf3 | 1716 | } |
6a7f3631 | 1717 | } |
7bd9bcf3 | 1718 | |
802de3da | 1719 | static int rename_tmp_log(struct files_ref_store *refs, const char *newrefname) |
6a7f3631 | 1720 | { |
e9dcc305 NTND |
1721 | struct strbuf path = STRBUF_INIT; |
1722 | struct strbuf tmp = STRBUF_INIT; | |
1723 | struct rename_cb cb; | |
1724 | int ret; | |
6a7f3631 | 1725 | |
802de3da NTND |
1726 | files_reflog_path(refs, &path, newrefname); |
1727 | files_reflog_path(refs, &tmp, TMP_RENAMED_LOG); | |
e9dcc305 NTND |
1728 | cb.tmp_renamed_log = tmp.buf; |
1729 | ret = raceproof_create_file(path.buf, rename_tmp_log_callback, &cb); | |
6a7f3631 MH |
1730 | if (ret) { |
1731 | if (errno == EISDIR) | |
e9dcc305 | 1732 | error("directory not empty: %s", path.buf); |
6a7f3631 | 1733 | else |
990c98d2 | 1734 | error("unable to move logfile %s to %s: %s", |
e9dcc305 NTND |
1735 | tmp.buf, path.buf, |
1736 | strerror(cb.true_errno)); | |
7bd9bcf3 | 1737 | } |
6a7f3631 | 1738 | |
e9dcc305 NTND |
1739 | strbuf_release(&path); |
1740 | strbuf_release(&tmp); | |
7bd9bcf3 MH |
1741 | return ret; |
1742 | } | |
1743 | ||
7bd9bcf3 | 1744 | static int write_ref_to_lockfile(struct ref_lock *lock, |
4417df8c | 1745 | const struct object_id *oid, struct strbuf *err); |
f18a7892 MH |
1746 | static int commit_ref_update(struct files_ref_store *refs, |
1747 | struct ref_lock *lock, | |
4417df8c | 1748 | const struct object_id *oid, const char *logmsg, |
5d9b2de4 | 1749 | struct strbuf *err); |
7bd9bcf3 | 1750 | |
9b6b40d9 DT |
1751 | static int files_rename_ref(struct ref_store *ref_store, |
1752 | const char *oldrefname, const char *newrefname, | |
1753 | const char *logmsg) | |
7bd9bcf3 | 1754 | { |
9b6b40d9 | 1755 | struct files_ref_store *refs = |
9e7ec634 | 1756 | files_downcast(ref_store, REF_STORE_WRITE, "rename_ref"); |
4417df8c | 1757 | struct object_id oid, orig_oid; |
7bd9bcf3 MH |
1758 | int flag = 0, logmoved = 0; |
1759 | struct ref_lock *lock; | |
1760 | struct stat loginfo; | |
e9dcc305 NTND |
1761 | struct strbuf sb_oldref = STRBUF_INIT; |
1762 | struct strbuf sb_newref = STRBUF_INIT; | |
1763 | struct strbuf tmp_renamed_log = STRBUF_INIT; | |
1764 | int log, ret; | |
7bd9bcf3 MH |
1765 | struct strbuf err = STRBUF_INIT; |
1766 | ||
802de3da NTND |
1767 | files_reflog_path(refs, &sb_oldref, oldrefname); |
1768 | files_reflog_path(refs, &sb_newref, newrefname); | |
1769 | files_reflog_path(refs, &tmp_renamed_log, TMP_RENAMED_LOG); | |
e9dcc305 NTND |
1770 | |
1771 | log = !lstat(sb_oldref.buf, &loginfo); | |
0a3f07d6 NTND |
1772 | if (log && S_ISLNK(loginfo.st_mode)) { |
1773 | ret = error("reflog for %s is a symlink", oldrefname); | |
1774 | goto out; | |
1775 | } | |
7bd9bcf3 | 1776 | |
2f40e954 NTND |
1777 | if (!refs_resolve_ref_unsafe(&refs->base, oldrefname, |
1778 | RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE, | |
4417df8c | 1779 | orig_oid.hash, &flag)) { |
0a3f07d6 NTND |
1780 | ret = error("refname %s not found", oldrefname); |
1781 | goto out; | |
1782 | } | |
e711b1af | 1783 | |
0a3f07d6 NTND |
1784 | if (flag & REF_ISSYMREF) { |
1785 | ret = error("refname %s is a symbolic ref, renaming it is not supported", | |
1786 | oldrefname); | |
1787 | goto out; | |
1788 | } | |
7d2df051 | 1789 | if (!refs_rename_ref_available(&refs->base, oldrefname, newrefname)) { |
0a3f07d6 NTND |
1790 | ret = 1; |
1791 | goto out; | |
1792 | } | |
7bd9bcf3 | 1793 | |
e9dcc305 | 1794 | if (log && rename(sb_oldref.buf, tmp_renamed_log.buf)) { |
a5c1efd6 | 1795 | ret = error("unable to move logfile logs/%s to logs/"TMP_RENAMED_LOG": %s", |
0a3f07d6 NTND |
1796 | oldrefname, strerror(errno)); |
1797 | goto out; | |
1798 | } | |
7bd9bcf3 | 1799 | |
2f40e954 | 1800 | if (refs_delete_ref(&refs->base, logmsg, oldrefname, |
4417df8c | 1801 | orig_oid.hash, REF_NODEREF)) { |
7bd9bcf3 MH |
1802 | error("unable to delete old %s", oldrefname); |
1803 | goto rollback; | |
1804 | } | |
1805 | ||
12fd3496 | 1806 | /* |
4417df8c | 1807 | * Since we are doing a shallow lookup, oid is not the |
1808 | * correct value to pass to delete_ref as old_oid. But that | |
1809 | * doesn't matter, because an old_oid check wouldn't add to | |
12fd3496 DT |
1810 | * the safety anyway; we want to delete the reference whatever |
1811 | * its current value. | |
1812 | */ | |
2f40e954 NTND |
1813 | if (!refs_read_ref_full(&refs->base, newrefname, |
1814 | RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE, | |
4417df8c | 1815 | oid.hash, NULL) && |
2f40e954 NTND |
1816 | refs_delete_ref(&refs->base, NULL, newrefname, |
1817 | NULL, REF_NODEREF)) { | |
58364324 | 1818 | if (errno == EISDIR) { |
7bd9bcf3 MH |
1819 | struct strbuf path = STRBUF_INIT; |
1820 | int result; | |
1821 | ||
19e02f4f | 1822 | files_ref_path(refs, &path, newrefname); |
7bd9bcf3 MH |
1823 | result = remove_empty_directories(&path); |
1824 | strbuf_release(&path); | |
1825 | ||
1826 | if (result) { | |
1827 | error("Directory not empty: %s", newrefname); | |
1828 | goto rollback; | |
1829 | } | |
1830 | } else { | |
1831 | error("unable to delete existing %s", newrefname); | |
1832 | goto rollback; | |
1833 | } | |
1834 | } | |
1835 | ||
802de3da | 1836 | if (log && rename_tmp_log(refs, newrefname)) |
7bd9bcf3 MH |
1837 | goto rollback; |
1838 | ||
1839 | logmoved = log; | |
1840 | ||
7eb27cdf MH |
1841 | lock = lock_ref_sha1_basic(refs, newrefname, NULL, NULL, NULL, |
1842 | REF_NODEREF, NULL, &err); | |
7bd9bcf3 MH |
1843 | if (!lock) { |
1844 | error("unable to rename '%s' to '%s': %s", oldrefname, newrefname, err.buf); | |
1845 | strbuf_release(&err); | |
1846 | goto rollback; | |
1847 | } | |
4417df8c | 1848 | oidcpy(&lock->old_oid, &orig_oid); |
7bd9bcf3 | 1849 | |
4417df8c | 1850 | if (write_ref_to_lockfile(lock, &orig_oid, &err) || |
1851 | commit_ref_update(refs, lock, &orig_oid, logmsg, &err)) { | |
7bd9bcf3 MH |
1852 | error("unable to write current sha1 into %s: %s", newrefname, err.buf); |
1853 | strbuf_release(&err); | |
1854 | goto rollback; | |
1855 | } | |
1856 | ||
0a3f07d6 NTND |
1857 | ret = 0; |
1858 | goto out; | |
7bd9bcf3 MH |
1859 | |
1860 | rollback: | |
7eb27cdf MH |
1861 | lock = lock_ref_sha1_basic(refs, oldrefname, NULL, NULL, NULL, |
1862 | REF_NODEREF, NULL, &err); | |
7bd9bcf3 MH |
1863 | if (!lock) { |
1864 | error("unable to lock %s for rollback: %s", oldrefname, err.buf); | |
1865 | strbuf_release(&err); | |
1866 | goto rollbacklog; | |
1867 | } | |
1868 | ||
1869 | flag = log_all_ref_updates; | |
341fb286 | 1870 | log_all_ref_updates = LOG_REFS_NONE; |
4417df8c | 1871 | if (write_ref_to_lockfile(lock, &orig_oid, &err) || |
1872 | commit_ref_update(refs, lock, &orig_oid, NULL, &err)) { | |
7bd9bcf3 MH |
1873 | error("unable to write current sha1 into %s: %s", oldrefname, err.buf); |
1874 | strbuf_release(&err); | |
1875 | } | |
1876 | log_all_ref_updates = flag; | |
1877 | ||
1878 | rollbacklog: | |
e9dcc305 | 1879 | if (logmoved && rename(sb_newref.buf, sb_oldref.buf)) |
7bd9bcf3 MH |
1880 | error("unable to restore logfile %s from %s: %s", |
1881 | oldrefname, newrefname, strerror(errno)); | |
1882 | if (!logmoved && log && | |
e9dcc305 | 1883 | rename(tmp_renamed_log.buf, sb_oldref.buf)) |
a5c1efd6 | 1884 | error("unable to restore logfile %s from logs/"TMP_RENAMED_LOG": %s", |
7bd9bcf3 | 1885 | oldrefname, strerror(errno)); |
0a3f07d6 NTND |
1886 | ret = 1; |
1887 | out: | |
e9dcc305 NTND |
1888 | strbuf_release(&sb_newref); |
1889 | strbuf_release(&sb_oldref); | |
1890 | strbuf_release(&tmp_renamed_log); | |
1891 | ||
0a3f07d6 | 1892 | return ret; |
7bd9bcf3 MH |
1893 | } |
1894 | ||
1895 | static int close_ref(struct ref_lock *lock) | |
1896 | { | |
1897 | if (close_lock_file(lock->lk)) | |
1898 | return -1; | |
1899 | return 0; | |
1900 | } | |
1901 | ||
1902 | static int commit_ref(struct ref_lock *lock) | |
1903 | { | |
5387c0d8 MH |
1904 | char *path = get_locked_file_path(lock->lk); |
1905 | struct stat st; | |
1906 | ||
1907 | if (!lstat(path, &st) && S_ISDIR(st.st_mode)) { | |
1908 | /* | |
1909 | * There is a directory at the path we want to rename | |
1910 | * the lockfile to. Hopefully it is empty; try to | |
1911 | * delete it. | |
1912 | */ | |
1913 | size_t len = strlen(path); | |
1914 | struct strbuf sb_path = STRBUF_INIT; | |
1915 | ||
1916 | strbuf_attach(&sb_path, path, len, len); | |
1917 | ||
1918 | /* | |
1919 | * If this fails, commit_lock_file() will also fail | |
1920 | * and will report the problem. | |
1921 | */ | |
1922 | remove_empty_directories(&sb_path); | |
1923 | strbuf_release(&sb_path); | |
1924 | } else { | |
1925 | free(path); | |
1926 | } | |
1927 | ||
7bd9bcf3 MH |
1928 | if (commit_lock_file(lock->lk)) |
1929 | return -1; | |
1930 | return 0; | |
1931 | } | |
1932 | ||
1fb0c809 MH |
1933 | static int open_or_create_logfile(const char *path, void *cb) |
1934 | { | |
1935 | int *fd = cb; | |
1936 | ||
1937 | *fd = open(path, O_APPEND | O_WRONLY | O_CREAT, 0666); | |
1938 | return (*fd < 0) ? -1 : 0; | |
1939 | } | |
1940 | ||
7bd9bcf3 | 1941 | /* |
4533e534 MH |
1942 | * Create a reflog for a ref. If force_create = 0, only create the |
1943 | * reflog for certain refs (those for which should_autocreate_reflog | |
1944 | * returns non-zero). Otherwise, create it regardless of the reference | |
1945 | * name. If the logfile already existed or was created, return 0 and | |
1946 | * set *logfd to the file descriptor opened for appending to the file. | |
1947 | * If no logfile exists and we decided not to create one, return 0 and | |
1948 | * set *logfd to -1. On failure, fill in *err, set *logfd to -1, and | |
1949 | * return -1. | |
7bd9bcf3 | 1950 | */ |
802de3da NTND |
1951 | static int log_ref_setup(struct files_ref_store *refs, |
1952 | const char *refname, int force_create, | |
4533e534 | 1953 | int *logfd, struct strbuf *err) |
7bd9bcf3 | 1954 | { |
802de3da NTND |
1955 | struct strbuf logfile_sb = STRBUF_INIT; |
1956 | char *logfile; | |
1957 | ||
1958 | files_reflog_path(refs, &logfile_sb, refname); | |
1959 | logfile = strbuf_detach(&logfile_sb, NULL); | |
7bd9bcf3 | 1960 | |
7bd9bcf3 | 1961 | if (force_create || should_autocreate_reflog(refname)) { |
4533e534 | 1962 | if (raceproof_create_file(logfile, open_or_create_logfile, logfd)) { |
1fb0c809 MH |
1963 | if (errno == ENOENT) |
1964 | strbuf_addf(err, "unable to create directory for '%s': " | |
4533e534 | 1965 | "%s", logfile, strerror(errno)); |
1fb0c809 MH |
1966 | else if (errno == EISDIR) |
1967 | strbuf_addf(err, "there are still logs under '%s'", | |
4533e534 | 1968 | logfile); |
1fb0c809 | 1969 | else |
854bda6b | 1970 | strbuf_addf(err, "unable to append to '%s': %s", |
4533e534 | 1971 | logfile, strerror(errno)); |
7bd9bcf3 | 1972 | |
4533e534 | 1973 | goto error; |
7bd9bcf3 | 1974 | } |
854bda6b | 1975 | } else { |
4533e534 | 1976 | *logfd = open(logfile, O_APPEND | O_WRONLY, 0666); |
e404f459 | 1977 | if (*logfd < 0) { |
854bda6b MH |
1978 | if (errno == ENOENT || errno == EISDIR) { |
1979 | /* | |
1980 | * The logfile doesn't already exist, | |
1981 | * but that is not an error; it only | |
1982 | * means that we won't write log | |
1983 | * entries to it. | |
1984 | */ | |
1985 | ; | |
1986 | } else { | |
1987 | strbuf_addf(err, "unable to append to '%s': %s", | |
4533e534 MH |
1988 | logfile, strerror(errno)); |
1989 | goto error; | |
854bda6b | 1990 | } |
7bd9bcf3 MH |
1991 | } |
1992 | } | |
1993 | ||
e404f459 | 1994 | if (*logfd >= 0) |
4533e534 | 1995 | adjust_shared_perm(logfile); |
854bda6b | 1996 | |
4533e534 | 1997 | free(logfile); |
7bd9bcf3 | 1998 | return 0; |
7bd9bcf3 | 1999 | |
4533e534 MH |
2000 | error: |
2001 | free(logfile); | |
2002 | return -1; | |
7bd9bcf3 | 2003 | } |
7bd9bcf3 | 2004 | |
e3688bd6 DT |
2005 | static int files_create_reflog(struct ref_store *ref_store, |
2006 | const char *refname, int force_create, | |
2007 | struct strbuf *err) | |
7bd9bcf3 | 2008 | { |
802de3da | 2009 | struct files_ref_store *refs = |
9e7ec634 | 2010 | files_downcast(ref_store, REF_STORE_WRITE, "create_reflog"); |
e404f459 | 2011 | int fd; |
7bd9bcf3 | 2012 | |
802de3da | 2013 | if (log_ref_setup(refs, refname, force_create, &fd, err)) |
4533e534 MH |
2014 | return -1; |
2015 | ||
e404f459 MH |
2016 | if (fd >= 0) |
2017 | close(fd); | |
4533e534 MH |
2018 | |
2019 | return 0; | |
7bd9bcf3 MH |
2020 | } |
2021 | ||
4417df8c | 2022 | static int log_ref_write_fd(int fd, const struct object_id *old_oid, |
2023 | const struct object_id *new_oid, | |
7bd9bcf3 MH |
2024 | const char *committer, const char *msg) |
2025 | { | |
2026 | int msglen, written; | |
2027 | unsigned maxlen, len; | |
2028 | char *logrec; | |
2029 | ||
2030 | msglen = msg ? strlen(msg) : 0; | |
2031 | maxlen = strlen(committer) + msglen + 100; | |
2032 | logrec = xmalloc(maxlen); | |
2033 | len = xsnprintf(logrec, maxlen, "%s %s %s\n", | |
4417df8c | 2034 | oid_to_hex(old_oid), |
2035 | oid_to_hex(new_oid), | |
7bd9bcf3 MH |
2036 | committer); |
2037 | if (msglen) | |
2038 | len += copy_reflog_msg(logrec + len - 1, msg) - 1; | |
2039 | ||
2040 | written = len <= maxlen ? write_in_full(fd, logrec, len) : -1; | |
2041 | free(logrec); | |
2042 | if (written != len) | |
2043 | return -1; | |
2044 | ||
2045 | return 0; | |
2046 | } | |
2047 | ||
802de3da | 2048 | static int files_log_ref_write(struct files_ref_store *refs, |
4417df8c | 2049 | const char *refname, const struct object_id *old_oid, |
2050 | const struct object_id *new_oid, const char *msg, | |
11f8457f | 2051 | int flags, struct strbuf *err) |
7bd9bcf3 | 2052 | { |
e404f459 | 2053 | int logfd, result; |
7bd9bcf3 | 2054 | |
341fb286 CW |
2055 | if (log_all_ref_updates == LOG_REFS_UNSET) |
2056 | log_all_ref_updates = is_bare_repository() ? LOG_REFS_NONE : LOG_REFS_NORMAL; | |
7bd9bcf3 | 2057 | |
802de3da NTND |
2058 | result = log_ref_setup(refs, refname, |
2059 | flags & REF_FORCE_CREATE_REFLOG, | |
4533e534 | 2060 | &logfd, err); |
7bd9bcf3 MH |
2061 | |
2062 | if (result) | |
2063 | return result; | |
2064 | ||
7bd9bcf3 MH |
2065 | if (logfd < 0) |
2066 | return 0; | |
4417df8c | 2067 | result = log_ref_write_fd(logfd, old_oid, new_oid, |
7bd9bcf3 MH |
2068 | git_committer_info(0), msg); |
2069 | if (result) { | |
e9dcc305 | 2070 | struct strbuf sb = STRBUF_INIT; |
87b21e05 MH |
2071 | int save_errno = errno; |
2072 | ||
802de3da | 2073 | files_reflog_path(refs, &sb, refname); |
87b21e05 | 2074 | strbuf_addf(err, "unable to append to '%s': %s", |
e9dcc305 NTND |
2075 | sb.buf, strerror(save_errno)); |
2076 | strbuf_release(&sb); | |
7bd9bcf3 MH |
2077 | close(logfd); |
2078 | return -1; | |
2079 | } | |
2080 | if (close(logfd)) { | |
e9dcc305 | 2081 | struct strbuf sb = STRBUF_INIT; |
87b21e05 MH |
2082 | int save_errno = errno; |
2083 | ||
802de3da | 2084 | files_reflog_path(refs, &sb, refname); |
87b21e05 | 2085 | strbuf_addf(err, "unable to append to '%s': %s", |
e9dcc305 NTND |
2086 | sb.buf, strerror(save_errno)); |
2087 | strbuf_release(&sb); | |
7bd9bcf3 MH |
2088 | return -1; |
2089 | } | |
2090 | return 0; | |
2091 | } | |
2092 | ||
7bd9bcf3 MH |
2093 | /* |
2094 | * Write sha1 into the open lockfile, then close the lockfile. On | |
2095 | * errors, rollback the lockfile, fill in *err and | |
2096 | * return -1. | |
2097 | */ | |
2098 | static int write_ref_to_lockfile(struct ref_lock *lock, | |
4417df8c | 2099 | const struct object_id *oid, struct strbuf *err) |
7bd9bcf3 MH |
2100 | { |
2101 | static char term = '\n'; | |
2102 | struct object *o; | |
2103 | int fd; | |
2104 | ||
c251c83d | 2105 | o = parse_object(oid); |
7bd9bcf3 MH |
2106 | if (!o) { |
2107 | strbuf_addf(err, | |
0568c8e9 | 2108 | "trying to write ref '%s' with nonexistent object %s", |
4417df8c | 2109 | lock->ref_name, oid_to_hex(oid)); |
7bd9bcf3 MH |
2110 | unlock_ref(lock); |
2111 | return -1; | |
2112 | } | |
2113 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
2114 | strbuf_addf(err, | |
0568c8e9 | 2115 | "trying to write non-commit object %s to branch '%s'", |
4417df8c | 2116 | oid_to_hex(oid), lock->ref_name); |
7bd9bcf3 MH |
2117 | unlock_ref(lock); |
2118 | return -1; | |
2119 | } | |
2120 | fd = get_lock_file_fd(lock->lk); | |
4417df8c | 2121 | if (write_in_full(fd, oid_to_hex(oid), GIT_SHA1_HEXSZ) != GIT_SHA1_HEXSZ || |
7bd9bcf3 MH |
2122 | write_in_full(fd, &term, 1) != 1 || |
2123 | close_ref(lock) < 0) { | |
2124 | strbuf_addf(err, | |
0568c8e9 | 2125 | "couldn't write '%s'", get_lock_file_path(lock->lk)); |
7bd9bcf3 MH |
2126 | unlock_ref(lock); |
2127 | return -1; | |
2128 | } | |
2129 | return 0; | |
2130 | } | |
2131 | ||
2132 | /* | |
2133 | * Commit a change to a loose reference that has already been written | |
2134 | * to the loose reference lockfile. Also update the reflogs if | |
2135 | * necessary, using the specified lockmsg (which can be NULL). | |
2136 | */ | |
f18a7892 MH |
2137 | static int commit_ref_update(struct files_ref_store *refs, |
2138 | struct ref_lock *lock, | |
4417df8c | 2139 | const struct object_id *oid, const char *logmsg, |
5d9b2de4 | 2140 | struct strbuf *err) |
7bd9bcf3 | 2141 | { |
32c597e7 | 2142 | files_assert_main_repository(refs, "commit_ref_update"); |
00eebe35 MH |
2143 | |
2144 | clear_loose_ref_cache(refs); | |
802de3da | 2145 | if (files_log_ref_write(refs, lock->ref_name, |
4417df8c | 2146 | &lock->old_oid, oid, |
81b1b6d4 | 2147 | logmsg, 0, err)) { |
7bd9bcf3 | 2148 | char *old_msg = strbuf_detach(err, NULL); |
0568c8e9 | 2149 | strbuf_addf(err, "cannot update the ref '%s': %s", |
7bd9bcf3 MH |
2150 | lock->ref_name, old_msg); |
2151 | free(old_msg); | |
2152 | unlock_ref(lock); | |
2153 | return -1; | |
2154 | } | |
7a418f3a MH |
2155 | |
2156 | if (strcmp(lock->ref_name, "HEAD") != 0) { | |
7bd9bcf3 MH |
2157 | /* |
2158 | * Special hack: If a branch is updated directly and HEAD | |
2159 | * points to it (may happen on the remote side of a push | |
2160 | * for example) then logically the HEAD reflog should be | |
2161 | * updated too. | |
2162 | * A generic solution implies reverse symref information, | |
2163 | * but finding all symrefs pointing to the given branch | |
2164 | * would be rather costly for this rare event (the direct | |
2165 | * update of a branch) to be worth it. So let's cheat and | |
2166 | * check with HEAD only which should cover 99% of all usage | |
2167 | * scenarios (even 100% of the default ones). | |
2168 | */ | |
4417df8c | 2169 | struct object_id head_oid; |
7bd9bcf3 MH |
2170 | int head_flag; |
2171 | const char *head_ref; | |
7a418f3a | 2172 | |
2f40e954 NTND |
2173 | head_ref = refs_resolve_ref_unsafe(&refs->base, "HEAD", |
2174 | RESOLVE_REF_READING, | |
4417df8c | 2175 | head_oid.hash, &head_flag); |
7bd9bcf3 MH |
2176 | if (head_ref && (head_flag & REF_ISSYMREF) && |
2177 | !strcmp(head_ref, lock->ref_name)) { | |
2178 | struct strbuf log_err = STRBUF_INIT; | |
802de3da | 2179 | if (files_log_ref_write(refs, "HEAD", |
4417df8c | 2180 | &lock->old_oid, oid, |
802de3da | 2181 | logmsg, 0, &log_err)) { |
7bd9bcf3 MH |
2182 | error("%s", log_err.buf); |
2183 | strbuf_release(&log_err); | |
2184 | } | |
2185 | } | |
2186 | } | |
7a418f3a | 2187 | |
7bd9bcf3 | 2188 | if (commit_ref(lock)) { |
0568c8e9 | 2189 | strbuf_addf(err, "couldn't set '%s'", lock->ref_name); |
7bd9bcf3 MH |
2190 | unlock_ref(lock); |
2191 | return -1; | |
2192 | } | |
2193 | ||
2194 | unlock_ref(lock); | |
2195 | return 0; | |
2196 | } | |
2197 | ||
370e5ad6 | 2198 | static int create_ref_symlink(struct ref_lock *lock, const char *target) |
7bd9bcf3 | 2199 | { |
370e5ad6 | 2200 | int ret = -1; |
7bd9bcf3 | 2201 | #ifndef NO_SYMLINK_HEAD |
370e5ad6 JK |
2202 | char *ref_path = get_locked_file_path(lock->lk); |
2203 | unlink(ref_path); | |
2204 | ret = symlink(target, ref_path); | |
2205 | free(ref_path); | |
2206 | ||
2207 | if (ret) | |
7bd9bcf3 | 2208 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
7bd9bcf3 | 2209 | #endif |
370e5ad6 JK |
2210 | return ret; |
2211 | } | |
7bd9bcf3 | 2212 | |
802de3da NTND |
2213 | static void update_symref_reflog(struct files_ref_store *refs, |
2214 | struct ref_lock *lock, const char *refname, | |
370e5ad6 JK |
2215 | const char *target, const char *logmsg) |
2216 | { | |
2217 | struct strbuf err = STRBUF_INIT; | |
4417df8c | 2218 | struct object_id new_oid; |
2f40e954 NTND |
2219 | if (logmsg && |
2220 | !refs_read_ref_full(&refs->base, target, | |
4417df8c | 2221 | RESOLVE_REF_READING, new_oid.hash, NULL) && |
2222 | files_log_ref_write(refs, refname, &lock->old_oid, | |
2223 | &new_oid, logmsg, 0, &err)) { | |
7bd9bcf3 MH |
2224 | error("%s", err.buf); |
2225 | strbuf_release(&err); | |
2226 | } | |
370e5ad6 | 2227 | } |
7bd9bcf3 | 2228 | |
802de3da NTND |
2229 | static int create_symref_locked(struct files_ref_store *refs, |
2230 | struct ref_lock *lock, const char *refname, | |
370e5ad6 JK |
2231 | const char *target, const char *logmsg) |
2232 | { | |
2233 | if (prefer_symlink_refs && !create_ref_symlink(lock, target)) { | |
802de3da | 2234 | update_symref_reflog(refs, lock, refname, target, logmsg); |
370e5ad6 JK |
2235 | return 0; |
2236 | } | |
2237 | ||
2238 | if (!fdopen_lock_file(lock->lk, "w")) | |
2239 | return error("unable to fdopen %s: %s", | |
2240 | lock->lk->tempfile.filename.buf, strerror(errno)); | |
2241 | ||
802de3da | 2242 | update_symref_reflog(refs, lock, refname, target, logmsg); |
396da8f7 | 2243 | |
370e5ad6 JK |
2244 | /* no error check; commit_ref will check ferror */ |
2245 | fprintf(lock->lk->tempfile.fp, "ref: %s\n", target); | |
2246 | if (commit_ref(lock) < 0) | |
2247 | return error("unable to write symref for %s: %s", refname, | |
2248 | strerror(errno)); | |
7bd9bcf3 MH |
2249 | return 0; |
2250 | } | |
2251 | ||
284689ba MH |
2252 | static int files_create_symref(struct ref_store *ref_store, |
2253 | const char *refname, const char *target, | |
2254 | const char *logmsg) | |
370e5ad6 | 2255 | { |
7eb27cdf | 2256 | struct files_ref_store *refs = |
9e7ec634 | 2257 | files_downcast(ref_store, REF_STORE_WRITE, "create_symref"); |
370e5ad6 JK |
2258 | struct strbuf err = STRBUF_INIT; |
2259 | struct ref_lock *lock; | |
2260 | int ret; | |
2261 | ||
7eb27cdf MH |
2262 | lock = lock_ref_sha1_basic(refs, refname, NULL, |
2263 | NULL, NULL, REF_NODEREF, NULL, | |
370e5ad6 JK |
2264 | &err); |
2265 | if (!lock) { | |
2266 | error("%s", err.buf); | |
2267 | strbuf_release(&err); | |
2268 | return -1; | |
2269 | } | |
2270 | ||
802de3da | 2271 | ret = create_symref_locked(refs, lock, refname, target, logmsg); |
370e5ad6 JK |
2272 | unlock_ref(lock); |
2273 | return ret; | |
2274 | } | |
2275 | ||
e3688bd6 DT |
2276 | static int files_reflog_exists(struct ref_store *ref_store, |
2277 | const char *refname) | |
7bd9bcf3 | 2278 | { |
802de3da | 2279 | struct files_ref_store *refs = |
9e7ec634 | 2280 | files_downcast(ref_store, REF_STORE_READ, "reflog_exists"); |
e9dcc305 | 2281 | struct strbuf sb = STRBUF_INIT; |
7bd9bcf3 | 2282 | struct stat st; |
e9dcc305 | 2283 | int ret; |
7bd9bcf3 | 2284 | |
802de3da | 2285 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
2286 | ret = !lstat(sb.buf, &st) && S_ISREG(st.st_mode); |
2287 | strbuf_release(&sb); | |
2288 | return ret; | |
7bd9bcf3 MH |
2289 | } |
2290 | ||
e3688bd6 DT |
2291 | static int files_delete_reflog(struct ref_store *ref_store, |
2292 | const char *refname) | |
7bd9bcf3 | 2293 | { |
802de3da | 2294 | struct files_ref_store *refs = |
9e7ec634 | 2295 | files_downcast(ref_store, REF_STORE_WRITE, "delete_reflog"); |
e9dcc305 NTND |
2296 | struct strbuf sb = STRBUF_INIT; |
2297 | int ret; | |
2298 | ||
802de3da | 2299 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
2300 | ret = remove_path(sb.buf); |
2301 | strbuf_release(&sb); | |
2302 | return ret; | |
7bd9bcf3 MH |
2303 | } |
2304 | ||
2305 | static int show_one_reflog_ent(struct strbuf *sb, each_reflog_ent_fn fn, void *cb_data) | |
2306 | { | |
9461d272 | 2307 | struct object_id ooid, noid; |
7bd9bcf3 | 2308 | char *email_end, *message; |
dddbad72 | 2309 | timestamp_t timestamp; |
7bd9bcf3 | 2310 | int tz; |
43bc3b6c | 2311 | const char *p = sb->buf; |
7bd9bcf3 MH |
2312 | |
2313 | /* old SP new SP name <email> SP time TAB msg LF */ | |
43bc3b6c | 2314 | if (!sb->len || sb->buf[sb->len - 1] != '\n' || |
2315 | parse_oid_hex(p, &ooid, &p) || *p++ != ' ' || | |
2316 | parse_oid_hex(p, &noid, &p) || *p++ != ' ' || | |
2317 | !(email_end = strchr(p, '>')) || | |
7bd9bcf3 | 2318 | email_end[1] != ' ' || |
1aeb7e75 | 2319 | !(timestamp = parse_timestamp(email_end + 2, &message, 10)) || |
7bd9bcf3 MH |
2320 | !message || message[0] != ' ' || |
2321 | (message[1] != '+' && message[1] != '-') || | |
2322 | !isdigit(message[2]) || !isdigit(message[3]) || | |
2323 | !isdigit(message[4]) || !isdigit(message[5])) | |
2324 | return 0; /* corrupt? */ | |
2325 | email_end[1] = '\0'; | |
2326 | tz = strtol(message + 1, NULL, 10); | |
2327 | if (message[6] != '\t') | |
2328 | message += 6; | |
2329 | else | |
2330 | message += 7; | |
43bc3b6c | 2331 | return fn(&ooid, &noid, p, timestamp, tz, message, cb_data); |
7bd9bcf3 MH |
2332 | } |
2333 | ||
2334 | static char *find_beginning_of_line(char *bob, char *scan) | |
2335 | { | |
2336 | while (bob < scan && *(--scan) != '\n') | |
2337 | ; /* keep scanning backwards */ | |
2338 | /* | |
2339 | * Return either beginning of the buffer, or LF at the end of | |
2340 | * the previous line. | |
2341 | */ | |
2342 | return scan; | |
2343 | } | |
2344 | ||
e3688bd6 DT |
2345 | static int files_for_each_reflog_ent_reverse(struct ref_store *ref_store, |
2346 | const char *refname, | |
2347 | each_reflog_ent_fn fn, | |
2348 | void *cb_data) | |
7bd9bcf3 | 2349 | { |
802de3da | 2350 | struct files_ref_store *refs = |
9e7ec634 NTND |
2351 | files_downcast(ref_store, REF_STORE_READ, |
2352 | "for_each_reflog_ent_reverse"); | |
7bd9bcf3 MH |
2353 | struct strbuf sb = STRBUF_INIT; |
2354 | FILE *logfp; | |
2355 | long pos; | |
2356 | int ret = 0, at_tail = 1; | |
2357 | ||
802de3da | 2358 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
2359 | logfp = fopen(sb.buf, "r"); |
2360 | strbuf_release(&sb); | |
7bd9bcf3 MH |
2361 | if (!logfp) |
2362 | return -1; | |
2363 | ||
2364 | /* Jump to the end */ | |
2365 | if (fseek(logfp, 0, SEEK_END) < 0) | |
be686f03 RS |
2366 | ret = error("cannot seek back reflog for %s: %s", |
2367 | refname, strerror(errno)); | |
7bd9bcf3 MH |
2368 | pos = ftell(logfp); |
2369 | while (!ret && 0 < pos) { | |
2370 | int cnt; | |
2371 | size_t nread; | |
2372 | char buf[BUFSIZ]; | |
2373 | char *endp, *scanp; | |
2374 | ||
2375 | /* Fill next block from the end */ | |
2376 | cnt = (sizeof(buf) < pos) ? sizeof(buf) : pos; | |
be686f03 RS |
2377 | if (fseek(logfp, pos - cnt, SEEK_SET)) { |
2378 | ret = error("cannot seek back reflog for %s: %s", | |
2379 | refname, strerror(errno)); | |
2380 | break; | |
2381 | } | |
7bd9bcf3 | 2382 | nread = fread(buf, cnt, 1, logfp); |
be686f03 RS |
2383 | if (nread != 1) { |
2384 | ret = error("cannot read %d bytes from reflog for %s: %s", | |
2385 | cnt, refname, strerror(errno)); | |
2386 | break; | |
2387 | } | |
7bd9bcf3 MH |
2388 | pos -= cnt; |
2389 | ||
2390 | scanp = endp = buf + cnt; | |
2391 | if (at_tail && scanp[-1] == '\n') | |
2392 | /* Looking at the final LF at the end of the file */ | |
2393 | scanp--; | |
2394 | at_tail = 0; | |
2395 | ||
2396 | while (buf < scanp) { | |
2397 | /* | |
2398 | * terminating LF of the previous line, or the beginning | |
2399 | * of the buffer. | |
2400 | */ | |
2401 | char *bp; | |
2402 | ||
2403 | bp = find_beginning_of_line(buf, scanp); | |
2404 | ||
2405 | if (*bp == '\n') { | |
2406 | /* | |
2407 | * The newline is the end of the previous line, | |
2408 | * so we know we have complete line starting | |
2409 | * at (bp + 1). Prefix it onto any prior data | |
2410 | * we collected for the line and process it. | |
2411 | */ | |
2412 | strbuf_splice(&sb, 0, 0, bp + 1, endp - (bp + 1)); | |
2413 | scanp = bp; | |
2414 | endp = bp + 1; | |
2415 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
2416 | strbuf_reset(&sb); | |
2417 | if (ret) | |
2418 | break; | |
2419 | } else if (!pos) { | |
2420 | /* | |
2421 | * We are at the start of the buffer, and the | |
2422 | * start of the file; there is no previous | |
2423 | * line, and we have everything for this one. | |
2424 | * Process it, and we can end the loop. | |
2425 | */ | |
2426 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
2427 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
2428 | strbuf_reset(&sb); | |
2429 | break; | |
2430 | } | |
2431 | ||
2432 | if (bp == buf) { | |
2433 | /* | |
2434 | * We are at the start of the buffer, and there | |
2435 | * is more file to read backwards. Which means | |
2436 | * we are in the middle of a line. Note that we | |
2437 | * may get here even if *bp was a newline; that | |
2438 | * just means we are at the exact end of the | |
2439 | * previous line, rather than some spot in the | |
2440 | * middle. | |
2441 | * | |
2442 | * Save away what we have to be combined with | |
2443 | * the data from the next read. | |
2444 | */ | |
2445 | strbuf_splice(&sb, 0, 0, buf, endp - buf); | |
2446 | break; | |
2447 | } | |
2448 | } | |
2449 | ||
2450 | } | |
2451 | if (!ret && sb.len) | |
2452 | die("BUG: reverse reflog parser had leftover data"); | |
2453 | ||
2454 | fclose(logfp); | |
2455 | strbuf_release(&sb); | |
2456 | return ret; | |
2457 | } | |
2458 | ||
e3688bd6 DT |
2459 | static int files_for_each_reflog_ent(struct ref_store *ref_store, |
2460 | const char *refname, | |
2461 | each_reflog_ent_fn fn, void *cb_data) | |
7bd9bcf3 | 2462 | { |
802de3da | 2463 | struct files_ref_store *refs = |
9e7ec634 NTND |
2464 | files_downcast(ref_store, REF_STORE_READ, |
2465 | "for_each_reflog_ent"); | |
7bd9bcf3 MH |
2466 | FILE *logfp; |
2467 | struct strbuf sb = STRBUF_INIT; | |
2468 | int ret = 0; | |
2469 | ||
802de3da | 2470 | files_reflog_path(refs, &sb, refname); |
e9dcc305 NTND |
2471 | logfp = fopen(sb.buf, "r"); |
2472 | strbuf_release(&sb); | |
7bd9bcf3 MH |
2473 | if (!logfp) |
2474 | return -1; | |
2475 | ||
2476 | while (!ret && !strbuf_getwholeline(&sb, logfp, '\n')) | |
2477 | ret = show_one_reflog_ent(&sb, fn, cb_data); | |
2478 | fclose(logfp); | |
2479 | strbuf_release(&sb); | |
2480 | return ret; | |
2481 | } | |
7bd9bcf3 | 2482 | |
2880d16f MH |
2483 | struct files_reflog_iterator { |
2484 | struct ref_iterator base; | |
7bd9bcf3 | 2485 | |
2f40e954 | 2486 | struct ref_store *ref_store; |
2880d16f MH |
2487 | struct dir_iterator *dir_iterator; |
2488 | struct object_id oid; | |
2489 | }; | |
7bd9bcf3 | 2490 | |
2880d16f MH |
2491 | static int files_reflog_iterator_advance(struct ref_iterator *ref_iterator) |
2492 | { | |
2493 | struct files_reflog_iterator *iter = | |
2494 | (struct files_reflog_iterator *)ref_iterator; | |
2495 | struct dir_iterator *diter = iter->dir_iterator; | |
2496 | int ok; | |
2497 | ||
2498 | while ((ok = dir_iterator_advance(diter)) == ITER_OK) { | |
2499 | int flags; | |
2500 | ||
2501 | if (!S_ISREG(diter->st.st_mode)) | |
7bd9bcf3 | 2502 | continue; |
2880d16f MH |
2503 | if (diter->basename[0] == '.') |
2504 | continue; | |
2505 | if (ends_with(diter->basename, ".lock")) | |
7bd9bcf3 | 2506 | continue; |
7bd9bcf3 | 2507 | |
2f40e954 NTND |
2508 | if (refs_read_ref_full(iter->ref_store, |
2509 | diter->relative_path, 0, | |
2510 | iter->oid.hash, &flags)) { | |
2880d16f MH |
2511 | error("bad ref for %s", diter->path.buf); |
2512 | continue; | |
7bd9bcf3 | 2513 | } |
2880d16f MH |
2514 | |
2515 | iter->base.refname = diter->relative_path; | |
2516 | iter->base.oid = &iter->oid; | |
2517 | iter->base.flags = flags; | |
2518 | return ITER_OK; | |
7bd9bcf3 | 2519 | } |
2880d16f MH |
2520 | |
2521 | iter->dir_iterator = NULL; | |
2522 | if (ref_iterator_abort(ref_iterator) == ITER_ERROR) | |
2523 | ok = ITER_ERROR; | |
2524 | return ok; | |
2525 | } | |
2526 | ||
2527 | static int files_reflog_iterator_peel(struct ref_iterator *ref_iterator, | |
2528 | struct object_id *peeled) | |
2529 | { | |
2530 | die("BUG: ref_iterator_peel() called for reflog_iterator"); | |
2531 | } | |
2532 | ||
2533 | static int files_reflog_iterator_abort(struct ref_iterator *ref_iterator) | |
2534 | { | |
2535 | struct files_reflog_iterator *iter = | |
2536 | (struct files_reflog_iterator *)ref_iterator; | |
2537 | int ok = ITER_DONE; | |
2538 | ||
2539 | if (iter->dir_iterator) | |
2540 | ok = dir_iterator_abort(iter->dir_iterator); | |
2541 | ||
2542 | base_ref_iterator_free(ref_iterator); | |
2543 | return ok; | |
2544 | } | |
2545 | ||
2546 | static struct ref_iterator_vtable files_reflog_iterator_vtable = { | |
2547 | files_reflog_iterator_advance, | |
2548 | files_reflog_iterator_peel, | |
2549 | files_reflog_iterator_abort | |
2550 | }; | |
2551 | ||
e3688bd6 | 2552 | static struct ref_iterator *files_reflog_iterator_begin(struct ref_store *ref_store) |
2880d16f | 2553 | { |
802de3da | 2554 | struct files_ref_store *refs = |
9e7ec634 NTND |
2555 | files_downcast(ref_store, REF_STORE_READ, |
2556 | "reflog_iterator_begin"); | |
2880d16f MH |
2557 | struct files_reflog_iterator *iter = xcalloc(1, sizeof(*iter)); |
2558 | struct ref_iterator *ref_iterator = &iter->base; | |
e9dcc305 | 2559 | struct strbuf sb = STRBUF_INIT; |
2880d16f MH |
2560 | |
2561 | base_ref_iterator_init(ref_iterator, &files_reflog_iterator_vtable); | |
802de3da | 2562 | files_reflog_path(refs, &sb, NULL); |
e9dcc305 | 2563 | iter->dir_iterator = dir_iterator_begin(sb.buf); |
2f40e954 | 2564 | iter->ref_store = ref_store; |
e9dcc305 | 2565 | strbuf_release(&sb); |
2880d16f | 2566 | return ref_iterator; |
7bd9bcf3 MH |
2567 | } |
2568 | ||
165056b2 | 2569 | /* |
92b1551b MH |
2570 | * If update is a direct update of head_ref (the reference pointed to |
2571 | * by HEAD), then add an extra REF_LOG_ONLY update for HEAD. | |
2572 | */ | |
2573 | static int split_head_update(struct ref_update *update, | |
2574 | struct ref_transaction *transaction, | |
2575 | const char *head_ref, | |
2576 | struct string_list *affected_refnames, | |
2577 | struct strbuf *err) | |
2578 | { | |
2579 | struct string_list_item *item; | |
2580 | struct ref_update *new_update; | |
2581 | ||
2582 | if ((update->flags & REF_LOG_ONLY) || | |
2583 | (update->flags & REF_ISPRUNING) || | |
2584 | (update->flags & REF_UPDATE_VIA_HEAD)) | |
2585 | return 0; | |
2586 | ||
2587 | if (strcmp(update->refname, head_ref)) | |
2588 | return 0; | |
2589 | ||
2590 | /* | |
2591 | * First make sure that HEAD is not already in the | |
2592 | * transaction. This insertion is O(N) in the transaction | |
2593 | * size, but it happens at most once per transaction. | |
2594 | */ | |
2595 | item = string_list_insert(affected_refnames, "HEAD"); | |
2596 | if (item->util) { | |
2597 | /* An entry already existed */ | |
2598 | strbuf_addf(err, | |
2599 | "multiple updates for 'HEAD' (including one " | |
2600 | "via its referent '%s') are not allowed", | |
2601 | update->refname); | |
2602 | return TRANSACTION_NAME_CONFLICT; | |
2603 | } | |
2604 | ||
2605 | new_update = ref_transaction_add_update( | |
2606 | transaction, "HEAD", | |
2607 | update->flags | REF_LOG_ONLY | REF_NODEREF, | |
98491298 | 2608 | update->new_oid.hash, update->old_oid.hash, |
92b1551b MH |
2609 | update->msg); |
2610 | ||
2611 | item->util = new_update; | |
2612 | ||
2613 | return 0; | |
2614 | } | |
2615 | ||
2616 | /* | |
2617 | * update is for a symref that points at referent and doesn't have | |
2618 | * REF_NODEREF set. Split it into two updates: | |
2619 | * - The original update, but with REF_LOG_ONLY and REF_NODEREF set | |
2620 | * - A new, separate update for the referent reference | |
2621 | * Note that the new update will itself be subject to splitting when | |
2622 | * the iteration gets to it. | |
2623 | */ | |
fcc42ea0 MH |
2624 | static int split_symref_update(struct files_ref_store *refs, |
2625 | struct ref_update *update, | |
92b1551b MH |
2626 | const char *referent, |
2627 | struct ref_transaction *transaction, | |
2628 | struct string_list *affected_refnames, | |
2629 | struct strbuf *err) | |
2630 | { | |
2631 | struct string_list_item *item; | |
2632 | struct ref_update *new_update; | |
2633 | unsigned int new_flags; | |
2634 | ||
2635 | /* | |
2636 | * First make sure that referent is not already in the | |
c299468b | 2637 | * transaction. This check is O(lg N) in the transaction |
92b1551b MH |
2638 | * size, but it happens at most once per symref in a |
2639 | * transaction. | |
2640 | */ | |
c299468b MÅ |
2641 | if (string_list_has_string(affected_refnames, referent)) { |
2642 | /* An entry already exists */ | |
92b1551b MH |
2643 | strbuf_addf(err, |
2644 | "multiple updates for '%s' (including one " | |
2645 | "via symref '%s') are not allowed", | |
2646 | referent, update->refname); | |
2647 | return TRANSACTION_NAME_CONFLICT; | |
2648 | } | |
2649 | ||
2650 | new_flags = update->flags; | |
2651 | if (!strcmp(update->refname, "HEAD")) { | |
2652 | /* | |
2653 | * Record that the new update came via HEAD, so that | |
2654 | * when we process it, split_head_update() doesn't try | |
2655 | * to add another reflog update for HEAD. Note that | |
2656 | * this bit will be propagated if the new_update | |
2657 | * itself needs to be split. | |
2658 | */ | |
2659 | new_flags |= REF_UPDATE_VIA_HEAD; | |
2660 | } | |
2661 | ||
2662 | new_update = ref_transaction_add_update( | |
2663 | transaction, referent, new_flags, | |
98491298 | 2664 | update->new_oid.hash, update->old_oid.hash, |
92b1551b MH |
2665 | update->msg); |
2666 | ||
6e30b2f6 MH |
2667 | new_update->parent_update = update; |
2668 | ||
2669 | /* | |
2670 | * Change the symbolic ref update to log only. Also, it | |
2671 | * doesn't need to check its old SHA-1 value, as that will be | |
2672 | * done when new_update is processed. | |
2673 | */ | |
92b1551b | 2674 | update->flags |= REF_LOG_ONLY | REF_NODEREF; |
6e30b2f6 | 2675 | update->flags &= ~REF_HAVE_OLD; |
92b1551b | 2676 | |
c299468b MÅ |
2677 | /* |
2678 | * Add the referent. This insertion is O(N) in the transaction | |
2679 | * size, but it happens at most once per symref in a | |
2680 | * transaction. Make sure to add new_update->refname, which will | |
2681 | * be valid as long as affected_refnames is in use, and NOT | |
2682 | * referent, which might soon be freed by our caller. | |
2683 | */ | |
2684 | item = string_list_insert(affected_refnames, new_update->refname); | |
2685 | if (item->util) | |
2686 | BUG("%s unexpectedly found in affected_refnames", | |
2687 | new_update->refname); | |
92b1551b MH |
2688 | item->util = new_update; |
2689 | ||
2690 | return 0; | |
2691 | } | |
2692 | ||
6e30b2f6 MH |
2693 | /* |
2694 | * Return the refname under which update was originally requested. | |
2695 | */ | |
2696 | static const char *original_update_refname(struct ref_update *update) | |
2697 | { | |
2698 | while (update->parent_update) | |
2699 | update = update->parent_update; | |
2700 | ||
2701 | return update->refname; | |
2702 | } | |
2703 | ||
e3f51039 MH |
2704 | /* |
2705 | * Check whether the REF_HAVE_OLD and old_oid values stored in update | |
2706 | * are consistent with oid, which is the reference's current value. If | |
2707 | * everything is OK, return 0; otherwise, write an error message to | |
2708 | * err and return -1. | |
2709 | */ | |
2710 | static int check_old_oid(struct ref_update *update, struct object_id *oid, | |
2711 | struct strbuf *err) | |
2712 | { | |
2713 | if (!(update->flags & REF_HAVE_OLD) || | |
98491298 | 2714 | !oidcmp(oid, &update->old_oid)) |
e3f51039 MH |
2715 | return 0; |
2716 | ||
98491298 | 2717 | if (is_null_oid(&update->old_oid)) |
e3f51039 MH |
2718 | strbuf_addf(err, "cannot lock ref '%s': " |
2719 | "reference already exists", | |
2720 | original_update_refname(update)); | |
2721 | else if (is_null_oid(oid)) | |
2722 | strbuf_addf(err, "cannot lock ref '%s': " | |
2723 | "reference is missing but expected %s", | |
2724 | original_update_refname(update), | |
98491298 | 2725 | oid_to_hex(&update->old_oid)); |
e3f51039 MH |
2726 | else |
2727 | strbuf_addf(err, "cannot lock ref '%s': " | |
2728 | "is at %s but expected %s", | |
2729 | original_update_refname(update), | |
2730 | oid_to_hex(oid), | |
98491298 | 2731 | oid_to_hex(&update->old_oid)); |
e3f51039 MH |
2732 | |
2733 | return -1; | |
2734 | } | |
2735 | ||
92b1551b MH |
2736 | /* |
2737 | * Prepare for carrying out update: | |
2738 | * - Lock the reference referred to by update. | |
2739 | * - Read the reference under lock. | |
2740 | * - Check that its old SHA-1 value (if specified) is correct, and in | |
2741 | * any case record it in update->lock->old_oid for later use when | |
2742 | * writing the reflog. | |
2743 | * - If it is a symref update without REF_NODEREF, split it up into a | |
2744 | * REF_LOG_ONLY update of the symref and add a separate update for | |
2745 | * the referent to transaction. | |
2746 | * - If it is an update of head_ref, add a corresponding REF_LOG_ONLY | |
2747 | * update of HEAD. | |
165056b2 | 2748 | */ |
b3bbbc5c MH |
2749 | static int lock_ref_for_update(struct files_ref_store *refs, |
2750 | struct ref_update *update, | |
165056b2 | 2751 | struct ref_transaction *transaction, |
92b1551b | 2752 | const char *head_ref, |
165056b2 MH |
2753 | struct string_list *affected_refnames, |
2754 | struct strbuf *err) | |
2755 | { | |
92b1551b MH |
2756 | struct strbuf referent = STRBUF_INIT; |
2757 | int mustexist = (update->flags & REF_HAVE_OLD) && | |
98491298 | 2758 | !is_null_oid(&update->old_oid); |
165056b2 | 2759 | int ret; |
92b1551b | 2760 | struct ref_lock *lock; |
165056b2 | 2761 | |
32c597e7 | 2762 | files_assert_main_repository(refs, "lock_ref_for_update"); |
b3bbbc5c | 2763 | |
98491298 | 2764 | if ((update->flags & REF_HAVE_NEW) && is_null_oid(&update->new_oid)) |
165056b2 | 2765 | update->flags |= REF_DELETING; |
92b1551b MH |
2766 | |
2767 | if (head_ref) { | |
2768 | ret = split_head_update(update, transaction, head_ref, | |
2769 | affected_refnames, err); | |
2770 | if (ret) | |
2771 | return ret; | |
2772 | } | |
2773 | ||
f7b0a987 | 2774 | ret = lock_raw_ref(refs, update->refname, mustexist, |
92b1551b | 2775 | affected_refnames, NULL, |
7d618264 | 2776 | &lock, &referent, |
92b1551b | 2777 | &update->type, err); |
92b1551b | 2778 | if (ret) { |
165056b2 MH |
2779 | char *reason; |
2780 | ||
165056b2 MH |
2781 | reason = strbuf_detach(err, NULL); |
2782 | strbuf_addf(err, "cannot lock ref '%s': %s", | |
e3f51039 | 2783 | original_update_refname(update), reason); |
165056b2 MH |
2784 | free(reason); |
2785 | return ret; | |
2786 | } | |
92b1551b | 2787 | |
7d618264 | 2788 | update->backend_data = lock; |
92b1551b | 2789 | |
8169d0d0 | 2790 | if (update->type & REF_ISSYMREF) { |
6e30b2f6 MH |
2791 | if (update->flags & REF_NODEREF) { |
2792 | /* | |
2793 | * We won't be reading the referent as part of | |
2794 | * the transaction, so we have to read it here | |
2795 | * to record and possibly check old_sha1: | |
2796 | */ | |
2f40e954 NTND |
2797 | if (refs_read_ref_full(&refs->base, |
2798 | referent.buf, 0, | |
2799 | lock->old_oid.hash, NULL)) { | |
6e30b2f6 MH |
2800 | if (update->flags & REF_HAVE_OLD) { |
2801 | strbuf_addf(err, "cannot lock ref '%s': " | |
e3f51039 MH |
2802 | "error reading reference", |
2803 | original_update_refname(update)); | |
2804 | return -1; | |
6e30b2f6 | 2805 | } |
e3f51039 | 2806 | } else if (check_old_oid(update, &lock->old_oid, err)) { |
8169d0d0 | 2807 | return TRANSACTION_GENERIC_ERROR; |
8169d0d0 | 2808 | } |
6e30b2f6 MH |
2809 | } else { |
2810 | /* | |
2811 | * Create a new update for the reference this | |
2812 | * symref is pointing at. Also, we will record | |
2813 | * and verify old_sha1 for this update as part | |
2814 | * of processing the split-off update, so we | |
2815 | * don't have to do it here. | |
2816 | */ | |
fcc42ea0 MH |
2817 | ret = split_symref_update(refs, update, |
2818 | referent.buf, transaction, | |
92b1551b MH |
2819 | affected_refnames, err); |
2820 | if (ret) | |
2821 | return ret; | |
2822 | } | |
6e30b2f6 MH |
2823 | } else { |
2824 | struct ref_update *parent_update; | |
8169d0d0 | 2825 | |
e3f51039 MH |
2826 | if (check_old_oid(update, &lock->old_oid, err)) |
2827 | return TRANSACTION_GENERIC_ERROR; | |
2828 | ||
6e30b2f6 MH |
2829 | /* |
2830 | * If this update is happening indirectly because of a | |
2831 | * symref update, record the old SHA-1 in the parent | |
2832 | * update: | |
2833 | */ | |
2834 | for (parent_update = update->parent_update; | |
2835 | parent_update; | |
2836 | parent_update = parent_update->parent_update) { | |
7d618264 DT |
2837 | struct ref_lock *parent_lock = parent_update->backend_data; |
2838 | oidcpy(&parent_lock->old_oid, &lock->old_oid); | |
6e30b2f6 | 2839 | } |
92b1551b MH |
2840 | } |
2841 | ||
165056b2 MH |
2842 | if ((update->flags & REF_HAVE_NEW) && |
2843 | !(update->flags & REF_DELETING) && | |
2844 | !(update->flags & REF_LOG_ONLY)) { | |
92b1551b | 2845 | if (!(update->type & REF_ISSYMREF) && |
98491298 | 2846 | !oidcmp(&lock->old_oid, &update->new_oid)) { |
165056b2 MH |
2847 | /* |
2848 | * The reference already has the desired | |
2849 | * value, so we don't need to write it. | |
2850 | */ | |
4417df8c | 2851 | } else if (write_ref_to_lockfile(lock, &update->new_oid, |
165056b2 MH |
2852 | err)) { |
2853 | char *write_err = strbuf_detach(err, NULL); | |
2854 | ||
2855 | /* | |
2856 | * The lock was freed upon failure of | |
2857 | * write_ref_to_lockfile(): | |
2858 | */ | |
7d618264 | 2859 | update->backend_data = NULL; |
165056b2 | 2860 | strbuf_addf(err, |
e3f51039 | 2861 | "cannot update ref '%s': %s", |
165056b2 MH |
2862 | update->refname, write_err); |
2863 | free(write_err); | |
2864 | return TRANSACTION_GENERIC_ERROR; | |
2865 | } else { | |
2866 | update->flags |= REF_NEEDS_COMMIT; | |
2867 | } | |
2868 | } | |
2869 | if (!(update->flags & REF_NEEDS_COMMIT)) { | |
2870 | /* | |
2871 | * We didn't call write_ref_to_lockfile(), so | |
2872 | * the lockfile is still open. Close it to | |
2873 | * free up the file descriptor: | |
2874 | */ | |
92b1551b | 2875 | if (close_ref(lock)) { |
165056b2 MH |
2876 | strbuf_addf(err, "couldn't close '%s.lock'", |
2877 | update->refname); | |
2878 | return TRANSACTION_GENERIC_ERROR; | |
2879 | } | |
2880 | } | |
2881 | return 0; | |
2882 | } | |
2883 | ||
c0ca9357 MH |
2884 | /* |
2885 | * Unlock any references in `transaction` that are still locked, and | |
2886 | * mark the transaction closed. | |
2887 | */ | |
2888 | static void files_transaction_cleanup(struct ref_transaction *transaction) | |
2889 | { | |
2890 | size_t i; | |
2891 | ||
2892 | for (i = 0; i < transaction->nr; i++) { | |
2893 | struct ref_update *update = transaction->updates[i]; | |
2894 | struct ref_lock *lock = update->backend_data; | |
2895 | ||
2896 | if (lock) { | |
2897 | unlock_ref(lock); | |
2898 | update->backend_data = NULL; | |
2899 | } | |
2900 | } | |
2901 | ||
2902 | transaction->state = REF_TRANSACTION_CLOSED; | |
2903 | } | |
2904 | ||
30173b88 MH |
2905 | static int files_transaction_prepare(struct ref_store *ref_store, |
2906 | struct ref_transaction *transaction, | |
2907 | struct strbuf *err) | |
7bd9bcf3 | 2908 | { |
00eebe35 | 2909 | struct files_ref_store *refs = |
9e7ec634 | 2910 | files_downcast(ref_store, REF_STORE_WRITE, |
30173b88 | 2911 | "ref_transaction_prepare"); |
43a2dfde MH |
2912 | size_t i; |
2913 | int ret = 0; | |
7bd9bcf3 | 2914 | struct string_list affected_refnames = STRING_LIST_INIT_NODUP; |
92b1551b MH |
2915 | char *head_ref = NULL; |
2916 | int head_type; | |
2917 | struct object_id head_oid; | |
7bd9bcf3 MH |
2918 | |
2919 | assert(err); | |
2920 | ||
c0ca9357 MH |
2921 | if (!transaction->nr) |
2922 | goto cleanup; | |
7bd9bcf3 | 2923 | |
92b1551b MH |
2924 | /* |
2925 | * Fail if a refname appears more than once in the | |
2926 | * transaction. (If we end up splitting up any updates using | |
2927 | * split_symref_update() or split_head_update(), those | |
2928 | * functions will check that the new updates don't have the | |
2929 | * same refname as any existing ones.) | |
2930 | */ | |
2931 | for (i = 0; i < transaction->nr; i++) { | |
2932 | struct ref_update *update = transaction->updates[i]; | |
2933 | struct string_list_item *item = | |
2934 | string_list_append(&affected_refnames, update->refname); | |
2935 | ||
2936 | /* | |
2937 | * We store a pointer to update in item->util, but at | |
2938 | * the moment we never use the value of this field | |
2939 | * except to check whether it is non-NULL. | |
2940 | */ | |
2941 | item->util = update; | |
2942 | } | |
7bd9bcf3 MH |
2943 | string_list_sort(&affected_refnames); |
2944 | if (ref_update_reject_duplicates(&affected_refnames, err)) { | |
2945 | ret = TRANSACTION_GENERIC_ERROR; | |
2946 | goto cleanup; | |
2947 | } | |
2948 | ||
92b1551b MH |
2949 | /* |
2950 | * Special hack: If a branch is updated directly and HEAD | |
2951 | * points to it (may happen on the remote side of a push | |
2952 | * for example) then logically the HEAD reflog should be | |
2953 | * updated too. | |
2954 | * | |
2955 | * A generic solution would require reverse symref lookups, | |
2956 | * but finding all symrefs pointing to a given branch would be | |
2957 | * rather costly for this rare event (the direct update of a | |
2958 | * branch) to be worth it. So let's cheat and check with HEAD | |
2959 | * only, which should cover 99% of all usage scenarios (even | |
2960 | * 100% of the default ones). | |
2961 | * | |
2962 | * So if HEAD is a symbolic reference, then record the name of | |
2963 | * the reference that it points to. If we see an update of | |
2964 | * head_ref within the transaction, then split_head_update() | |
2965 | * arranges for the reflog of HEAD to be updated, too. | |
2966 | */ | |
2f40e954 NTND |
2967 | head_ref = refs_resolve_refdup(ref_store, "HEAD", |
2968 | RESOLVE_REF_NO_RECURSE, | |
2969 | head_oid.hash, &head_type); | |
92b1551b MH |
2970 | |
2971 | if (head_ref && !(head_type & REF_ISSYMREF)) { | |
6a83d902 | 2972 | FREE_AND_NULL(head_ref); |
92b1551b MH |
2973 | } |
2974 | ||
7bd9bcf3 MH |
2975 | /* |
2976 | * Acquire all locks, verify old values if provided, check | |
2977 | * that new values are valid, and write new values to the | |
2978 | * lockfiles, ready to be activated. Only keep one lockfile | |
2979 | * open at a time to avoid running out of file descriptors. | |
30173b88 MH |
2980 | * Note that lock_ref_for_update() might append more updates |
2981 | * to the transaction. | |
7bd9bcf3 | 2982 | */ |
efe47281 MH |
2983 | for (i = 0; i < transaction->nr; i++) { |
2984 | struct ref_update *update = transaction->updates[i]; | |
7bd9bcf3 | 2985 | |
b3bbbc5c MH |
2986 | ret = lock_ref_for_update(refs, update, transaction, |
2987 | head_ref, &affected_refnames, err); | |
165056b2 | 2988 | if (ret) |
30173b88 MH |
2989 | break; |
2990 | } | |
2991 | ||
2992 | cleanup: | |
2993 | free(head_ref); | |
2994 | string_list_clear(&affected_refnames, 0); | |
2995 | ||
2996 | if (ret) | |
2997 | files_transaction_cleanup(transaction); | |
2998 | else | |
2999 | transaction->state = REF_TRANSACTION_PREPARED; | |
3000 | ||
3001 | return ret; | |
3002 | } | |
3003 | ||
3004 | static int files_transaction_finish(struct ref_store *ref_store, | |
3005 | struct ref_transaction *transaction, | |
3006 | struct strbuf *err) | |
3007 | { | |
3008 | struct files_ref_store *refs = | |
3009 | files_downcast(ref_store, 0, "ref_transaction_finish"); | |
3010 | size_t i; | |
3011 | int ret = 0; | |
3012 | struct string_list refs_to_delete = STRING_LIST_INIT_NODUP; | |
3013 | struct string_list_item *ref_to_delete; | |
3014 | struct strbuf sb = STRBUF_INIT; | |
3015 | ||
3016 | assert(err); | |
3017 | ||
3018 | if (!transaction->nr) { | |
3019 | transaction->state = REF_TRANSACTION_CLOSED; | |
3020 | return 0; | |
7bd9bcf3 | 3021 | } |
7bd9bcf3 | 3022 | |
7bd9bcf3 | 3023 | /* Perform updates first so live commits remain referenced */ |
efe47281 MH |
3024 | for (i = 0; i < transaction->nr; i++) { |
3025 | struct ref_update *update = transaction->updates[i]; | |
7d618264 | 3026 | struct ref_lock *lock = update->backend_data; |
7bd9bcf3 | 3027 | |
d99aa884 DT |
3028 | if (update->flags & REF_NEEDS_COMMIT || |
3029 | update->flags & REF_LOG_ONLY) { | |
802de3da NTND |
3030 | if (files_log_ref_write(refs, |
3031 | lock->ref_name, | |
4417df8c | 3032 | &lock->old_oid, |
3033 | &update->new_oid, | |
81b1b6d4 MH |
3034 | update->msg, update->flags, |
3035 | err)) { | |
92b1551b MH |
3036 | char *old_msg = strbuf_detach(err, NULL); |
3037 | ||
3038 | strbuf_addf(err, "cannot update the ref '%s': %s", | |
3039 | lock->ref_name, old_msg); | |
3040 | free(old_msg); | |
3041 | unlock_ref(lock); | |
7d618264 | 3042 | update->backend_data = NULL; |
7bd9bcf3 MH |
3043 | ret = TRANSACTION_GENERIC_ERROR; |
3044 | goto cleanup; | |
7bd9bcf3 MH |
3045 | } |
3046 | } | |
7bd9bcf3 | 3047 | if (update->flags & REF_NEEDS_COMMIT) { |
00eebe35 | 3048 | clear_loose_ref_cache(refs); |
92b1551b MH |
3049 | if (commit_ref(lock)) { |
3050 | strbuf_addf(err, "couldn't set '%s'", lock->ref_name); | |
3051 | unlock_ref(lock); | |
7d618264 | 3052 | update->backend_data = NULL; |
7bd9bcf3 MH |
3053 | ret = TRANSACTION_GENERIC_ERROR; |
3054 | goto cleanup; | |
7bd9bcf3 MH |
3055 | } |
3056 | } | |
3057 | } | |
7bd9bcf3 | 3058 | /* Perform deletes now that updates are safely completed */ |
efe47281 MH |
3059 | for (i = 0; i < transaction->nr; i++) { |
3060 | struct ref_update *update = transaction->updates[i]; | |
7d618264 | 3061 | struct ref_lock *lock = update->backend_data; |
7bd9bcf3 | 3062 | |
d99aa884 DT |
3063 | if (update->flags & REF_DELETING && |
3064 | !(update->flags & REF_LOG_ONLY)) { | |
ce0af24d MH |
3065 | if (!(update->type & REF_ISPACKED) || |
3066 | update->type & REF_ISSYMREF) { | |
3067 | /* It is a loose reference. */ | |
e9dcc305 | 3068 | strbuf_reset(&sb); |
19e02f4f | 3069 | files_ref_path(refs, &sb, lock->ref_name); |
e9dcc305 | 3070 | if (unlink_or_msg(sb.buf, err)) { |
ce0af24d MH |
3071 | ret = TRANSACTION_GENERIC_ERROR; |
3072 | goto cleanup; | |
3073 | } | |
44639777 | 3074 | update->flags |= REF_DELETED_LOOSE; |
7bd9bcf3 MH |
3075 | } |
3076 | ||
3077 | if (!(update->flags & REF_ISPRUNING)) | |
3078 | string_list_append(&refs_to_delete, | |
7d618264 | 3079 | lock->ref_name); |
7bd9bcf3 MH |
3080 | } |
3081 | } | |
3082 | ||
0a95ac5f | 3083 | if (repack_without_refs(refs, &refs_to_delete, err)) { |
7bd9bcf3 MH |
3084 | ret = TRANSACTION_GENERIC_ERROR; |
3085 | goto cleanup; | |
3086 | } | |
44639777 MH |
3087 | |
3088 | /* Delete the reflogs of any references that were deleted: */ | |
3089 | for_each_string_list_item(ref_to_delete, &refs_to_delete) { | |
e9dcc305 | 3090 | strbuf_reset(&sb); |
802de3da | 3091 | files_reflog_path(refs, &sb, ref_to_delete->string); |
e9dcc305 | 3092 | if (!unlink_or_warn(sb.buf)) |
802de3da | 3093 | try_remove_empty_parents(refs, ref_to_delete->string, |
44639777 MH |
3094 | REMOVE_EMPTY_PARENTS_REFLOG); |
3095 | } | |
3096 | ||
00eebe35 | 3097 | clear_loose_ref_cache(refs); |
7bd9bcf3 MH |
3098 | |
3099 | cleanup: | |
c0ca9357 | 3100 | files_transaction_cleanup(transaction); |
7bd9bcf3 | 3101 | |
44639777 MH |
3102 | for (i = 0; i < transaction->nr; i++) { |
3103 | struct ref_update *update = transaction->updates[i]; | |
44639777 MH |
3104 | |
3105 | if (update->flags & REF_DELETED_LOOSE) { | |
3106 | /* | |
3107 | * The loose reference was deleted. Delete any | |
3108 | * empty parent directories. (Note that this | |
3109 | * can only work because we have already | |
3110 | * removed the lockfile.) | |
3111 | */ | |
802de3da | 3112 | try_remove_empty_parents(refs, update->refname, |
44639777 MH |
3113 | REMOVE_EMPTY_PARENTS_REF); |
3114 | } | |
3115 | } | |
3116 | ||
30173b88 | 3117 | strbuf_release(&sb); |
7bd9bcf3 | 3118 | string_list_clear(&refs_to_delete, 0); |
7bd9bcf3 MH |
3119 | return ret; |
3120 | } | |
3121 | ||
30173b88 MH |
3122 | static int files_transaction_abort(struct ref_store *ref_store, |
3123 | struct ref_transaction *transaction, | |
3124 | struct strbuf *err) | |
3125 | { | |
3126 | files_transaction_cleanup(transaction); | |
3127 | return 0; | |
3128 | } | |
3129 | ||
7bd9bcf3 MH |
3130 | static int ref_present(const char *refname, |
3131 | const struct object_id *oid, int flags, void *cb_data) | |
3132 | { | |
3133 | struct string_list *affected_refnames = cb_data; | |
3134 | ||
3135 | return string_list_has_string(affected_refnames, refname); | |
3136 | } | |
3137 | ||
fc681463 DT |
3138 | static int files_initial_transaction_commit(struct ref_store *ref_store, |
3139 | struct ref_transaction *transaction, | |
3140 | struct strbuf *err) | |
7bd9bcf3 | 3141 | { |
d99825ab | 3142 | struct files_ref_store *refs = |
9e7ec634 NTND |
3143 | files_downcast(ref_store, REF_STORE_WRITE, |
3144 | "initial_ref_transaction_commit"); | |
43a2dfde MH |
3145 | size_t i; |
3146 | int ret = 0; | |
7bd9bcf3 MH |
3147 | struct string_list affected_refnames = STRING_LIST_INIT_NODUP; |
3148 | ||
3149 | assert(err); | |
3150 | ||
3151 | if (transaction->state != REF_TRANSACTION_OPEN) | |
3152 | die("BUG: commit called for transaction that is not open"); | |
3153 | ||
3154 | /* Fail if a refname appears more than once in the transaction: */ | |
efe47281 MH |
3155 | for (i = 0; i < transaction->nr; i++) |
3156 | string_list_append(&affected_refnames, | |
3157 | transaction->updates[i]->refname); | |
7bd9bcf3 MH |
3158 | string_list_sort(&affected_refnames); |
3159 | if (ref_update_reject_duplicates(&affected_refnames, err)) { | |
3160 | ret = TRANSACTION_GENERIC_ERROR; | |
3161 | goto cleanup; | |
3162 | } | |
3163 | ||
3164 | /* | |
3165 | * It's really undefined to call this function in an active | |
3166 | * repository or when there are existing references: we are | |
3167 | * only locking and changing packed-refs, so (1) any | |
3168 | * simultaneous processes might try to change a reference at | |
3169 | * the same time we do, and (2) any existing loose versions of | |
3170 | * the references that we are setting would have precedence | |
3171 | * over our values. But some remote helpers create the remote | |
3172 | * "HEAD" and "master" branches before calling this function, | |
3173 | * so here we really only check that none of the references | |
3174 | * that we are creating already exists. | |
3175 | */ | |
2f40e954 NTND |
3176 | if (refs_for_each_rawref(&refs->base, ref_present, |
3177 | &affected_refnames)) | |
7bd9bcf3 MH |
3178 | die("BUG: initial ref transaction called with existing refs"); |
3179 | ||
efe47281 MH |
3180 | for (i = 0; i < transaction->nr; i++) { |
3181 | struct ref_update *update = transaction->updates[i]; | |
7bd9bcf3 MH |
3182 | |
3183 | if ((update->flags & REF_HAVE_OLD) && | |
98491298 | 3184 | !is_null_oid(&update->old_oid)) |
7bd9bcf3 | 3185 | die("BUG: initial ref transaction with old_sha1 set"); |
7d2df051 NTND |
3186 | if (refs_verify_refname_available(&refs->base, update->refname, |
3187 | &affected_refnames, NULL, | |
3188 | err)) { | |
7bd9bcf3 MH |
3189 | ret = TRANSACTION_NAME_CONFLICT; |
3190 | goto cleanup; | |
3191 | } | |
3192 | } | |
3193 | ||
49c0df6a | 3194 | if (lock_packed_refs(refs, 0)) { |
7bd9bcf3 MH |
3195 | strbuf_addf(err, "unable to lock packed-refs file: %s", |
3196 | strerror(errno)); | |
3197 | ret = TRANSACTION_GENERIC_ERROR; | |
3198 | goto cleanup; | |
3199 | } | |
3200 | ||
efe47281 MH |
3201 | for (i = 0; i < transaction->nr; i++) { |
3202 | struct ref_update *update = transaction->updates[i]; | |
7bd9bcf3 MH |
3203 | |
3204 | if ((update->flags & REF_HAVE_NEW) && | |
98491298 | 3205 | !is_null_oid(&update->new_oid)) |
3206 | add_packed_ref(refs, update->refname, | |
4417df8c | 3207 | &update->new_oid); |
7bd9bcf3 MH |
3208 | } |
3209 | ||
49c0df6a | 3210 | if (commit_packed_refs(refs)) { |
7bd9bcf3 MH |
3211 | strbuf_addf(err, "unable to commit packed-refs file: %s", |
3212 | strerror(errno)); | |
3213 | ret = TRANSACTION_GENERIC_ERROR; | |
3214 | goto cleanup; | |
3215 | } | |
3216 | ||
3217 | cleanup: | |
3218 | transaction->state = REF_TRANSACTION_CLOSED; | |
3219 | string_list_clear(&affected_refnames, 0); | |
3220 | return ret; | |
3221 | } | |
3222 | ||
3223 | struct expire_reflog_cb { | |
3224 | unsigned int flags; | |
3225 | reflog_expiry_should_prune_fn *should_prune_fn; | |
3226 | void *policy_cb; | |
3227 | FILE *newlog; | |
9461d272 | 3228 | struct object_id last_kept_oid; |
7bd9bcf3 MH |
3229 | }; |
3230 | ||
9461d272 | 3231 | static int expire_reflog_ent(struct object_id *ooid, struct object_id *noid, |
dddbad72 | 3232 | const char *email, timestamp_t timestamp, int tz, |
7bd9bcf3 MH |
3233 | const char *message, void *cb_data) |
3234 | { | |
3235 | struct expire_reflog_cb *cb = cb_data; | |
3236 | struct expire_reflog_policy_cb *policy_cb = cb->policy_cb; | |
3237 | ||
3238 | if (cb->flags & EXPIRE_REFLOGS_REWRITE) | |
9461d272 | 3239 | ooid = &cb->last_kept_oid; |
7bd9bcf3 | 3240 | |
4322478a | 3241 | if ((*cb->should_prune_fn)(ooid, noid, email, timestamp, tz, |
7bd9bcf3 MH |
3242 | message, policy_cb)) { |
3243 | if (!cb->newlog) | |
3244 | printf("would prune %s", message); | |
3245 | else if (cb->flags & EXPIRE_REFLOGS_VERBOSE) | |
3246 | printf("prune %s", message); | |
3247 | } else { | |
3248 | if (cb->newlog) { | |
cb71f8bd | 3249 | fprintf(cb->newlog, "%s %s %s %"PRItime" %+05d\t%s", |
9461d272 | 3250 | oid_to_hex(ooid), oid_to_hex(noid), |
7bd9bcf3 | 3251 | email, timestamp, tz, message); |
9461d272 | 3252 | oidcpy(&cb->last_kept_oid, noid); |
7bd9bcf3 MH |
3253 | } |
3254 | if (cb->flags & EXPIRE_REFLOGS_VERBOSE) | |
3255 | printf("keep %s", message); | |
3256 | } | |
3257 | return 0; | |
3258 | } | |
3259 | ||
e3688bd6 DT |
3260 | static int files_reflog_expire(struct ref_store *ref_store, |
3261 | const char *refname, const unsigned char *sha1, | |
3262 | unsigned int flags, | |
3263 | reflog_expiry_prepare_fn prepare_fn, | |
3264 | reflog_expiry_should_prune_fn should_prune_fn, | |
3265 | reflog_expiry_cleanup_fn cleanup_fn, | |
3266 | void *policy_cb_data) | |
7bd9bcf3 | 3267 | { |
7eb27cdf | 3268 | struct files_ref_store *refs = |
9e7ec634 | 3269 | files_downcast(ref_store, REF_STORE_WRITE, "reflog_expire"); |
7bd9bcf3 MH |
3270 | static struct lock_file reflog_lock; |
3271 | struct expire_reflog_cb cb; | |
3272 | struct ref_lock *lock; | |
802de3da | 3273 | struct strbuf log_file_sb = STRBUF_INIT; |
7bd9bcf3 MH |
3274 | char *log_file; |
3275 | int status = 0; | |
3276 | int type; | |
3277 | struct strbuf err = STRBUF_INIT; | |
4322478a | 3278 | struct object_id oid; |
7bd9bcf3 MH |
3279 | |
3280 | memset(&cb, 0, sizeof(cb)); | |
3281 | cb.flags = flags; | |
3282 | cb.policy_cb = policy_cb_data; | |
3283 | cb.should_prune_fn = should_prune_fn; | |
3284 | ||
3285 | /* | |
3286 | * The reflog file is locked by holding the lock on the | |
3287 | * reference itself, plus we might need to update the | |
3288 | * reference if --updateref was specified: | |
3289 | */ | |
7eb27cdf MH |
3290 | lock = lock_ref_sha1_basic(refs, refname, sha1, |
3291 | NULL, NULL, REF_NODEREF, | |
41d796ed | 3292 | &type, &err); |
7bd9bcf3 MH |
3293 | if (!lock) { |
3294 | error("cannot lock ref '%s': %s", refname, err.buf); | |
3295 | strbuf_release(&err); | |
3296 | return -1; | |
3297 | } | |
2f40e954 | 3298 | if (!refs_reflog_exists(ref_store, refname)) { |
7bd9bcf3 MH |
3299 | unlock_ref(lock); |
3300 | return 0; | |
3301 | } | |
3302 | ||
802de3da NTND |
3303 | files_reflog_path(refs, &log_file_sb, refname); |
3304 | log_file = strbuf_detach(&log_file_sb, NULL); | |
7bd9bcf3 MH |
3305 | if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) { |
3306 | /* | |
3307 | * Even though holding $GIT_DIR/logs/$reflog.lock has | |
3308 | * no locking implications, we use the lock_file | |
3309 | * machinery here anyway because it does a lot of the | |
3310 | * work we need, including cleaning up if the program | |
3311 | * exits unexpectedly. | |
3312 | */ | |
3313 | if (hold_lock_file_for_update(&reflog_lock, log_file, 0) < 0) { | |
3314 | struct strbuf err = STRBUF_INIT; | |
3315 | unable_to_lock_message(log_file, errno, &err); | |
3316 | error("%s", err.buf); | |
3317 | strbuf_release(&err); | |
3318 | goto failure; | |
3319 | } | |
3320 | cb.newlog = fdopen_lock_file(&reflog_lock, "w"); | |
3321 | if (!cb.newlog) { | |
3322 | error("cannot fdopen %s (%s)", | |
3323 | get_lock_file_path(&reflog_lock), strerror(errno)); | |
3324 | goto failure; | |
3325 | } | |
3326 | } | |
3327 | ||
4322478a | 3328 | hashcpy(oid.hash, sha1); |
3329 | ||
3330 | (*prepare_fn)(refname, &oid, cb.policy_cb); | |
2f40e954 | 3331 | refs_for_each_reflog_ent(ref_store, refname, expire_reflog_ent, &cb); |
7bd9bcf3 MH |
3332 | (*cleanup_fn)(cb.policy_cb); |
3333 | ||
3334 | if (!(flags & EXPIRE_REFLOGS_DRY_RUN)) { | |
3335 | /* | |
3336 | * It doesn't make sense to adjust a reference pointed | |
3337 | * to by a symbolic ref based on expiring entries in | |
3338 | * the symbolic reference's reflog. Nor can we update | |
3339 | * a reference if there are no remaining reflog | |
3340 | * entries. | |
3341 | */ | |
3342 | int update = (flags & EXPIRE_REFLOGS_UPDATE_REF) && | |
3343 | !(type & REF_ISSYMREF) && | |
9461d272 | 3344 | !is_null_oid(&cb.last_kept_oid); |
7bd9bcf3 MH |
3345 | |
3346 | if (close_lock_file(&reflog_lock)) { | |
3347 | status |= error("couldn't write %s: %s", log_file, | |
3348 | strerror(errno)); | |
3349 | } else if (update && | |
3350 | (write_in_full(get_lock_file_fd(lock->lk), | |
9461d272 | 3351 | oid_to_hex(&cb.last_kept_oid), GIT_SHA1_HEXSZ) != GIT_SHA1_HEXSZ || |
7bd9bcf3 MH |
3352 | write_str_in_full(get_lock_file_fd(lock->lk), "\n") != 1 || |
3353 | close_ref(lock) < 0)) { | |
3354 | status |= error("couldn't write %s", | |
3355 | get_lock_file_path(lock->lk)); | |
3356 | rollback_lock_file(&reflog_lock); | |
3357 | } else if (commit_lock_file(&reflog_lock)) { | |
e0048d3e | 3358 | status |= error("unable to write reflog '%s' (%s)", |
7bd9bcf3 MH |
3359 | log_file, strerror(errno)); |
3360 | } else if (update && commit_ref(lock)) { | |
3361 | status |= error("couldn't set %s", lock->ref_name); | |
3362 | } | |
3363 | } | |
3364 | free(log_file); | |
3365 | unlock_ref(lock); | |
3366 | return status; | |
3367 | ||
3368 | failure: | |
3369 | rollback_lock_file(&reflog_lock); | |
3370 | free(log_file); | |
3371 | unlock_ref(lock); | |
3372 | return -1; | |
3373 | } | |
3dce444f | 3374 | |
6fb5acfd DT |
3375 | static int files_init_db(struct ref_store *ref_store, struct strbuf *err) |
3376 | { | |
19e02f4f | 3377 | struct files_ref_store *refs = |
9e7ec634 | 3378 | files_downcast(ref_store, REF_STORE_WRITE, "init_db"); |
e9dcc305 NTND |
3379 | struct strbuf sb = STRBUF_INIT; |
3380 | ||
6fb5acfd DT |
3381 | /* |
3382 | * Create .git/refs/{heads,tags} | |
3383 | */ | |
19e02f4f | 3384 | files_ref_path(refs, &sb, "refs/heads"); |
e9dcc305 NTND |
3385 | safe_create_dir(sb.buf, 1); |
3386 | ||
3387 | strbuf_reset(&sb); | |
19e02f4f | 3388 | files_ref_path(refs, &sb, "refs/tags"); |
e9dcc305 NTND |
3389 | safe_create_dir(sb.buf, 1); |
3390 | ||
3391 | strbuf_release(&sb); | |
6fb5acfd DT |
3392 | return 0; |
3393 | } | |
3394 | ||
3dce444f RS |
3395 | struct ref_storage_be refs_be_files = { |
3396 | NULL, | |
00eebe35 | 3397 | "files", |
127b42a1 | 3398 | files_ref_store_create, |
6fb5acfd | 3399 | files_init_db, |
30173b88 MH |
3400 | files_transaction_prepare, |
3401 | files_transaction_finish, | |
3402 | files_transaction_abort, | |
fc681463 | 3403 | files_initial_transaction_commit, |
e1e33b72 | 3404 | |
8231527e | 3405 | files_pack_refs, |
bd427cf2 | 3406 | files_peel_ref, |
284689ba | 3407 | files_create_symref, |
a27dcf89 | 3408 | files_delete_refs, |
9b6b40d9 | 3409 | files_rename_ref, |
8231527e | 3410 | |
1a769003 | 3411 | files_ref_iterator_begin, |
62665823 | 3412 | files_read_raw_ref, |
e3688bd6 DT |
3413 | |
3414 | files_reflog_iterator_begin, | |
3415 | files_for_each_reflog_ent, | |
3416 | files_for_each_reflog_ent_reverse, | |
3417 | files_reflog_exists, | |
3418 | files_create_reflog, | |
3419 | files_delete_reflog, | |
3420 | files_reflog_expire | |
3dce444f | 3421 | }; |