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Commit | Line | Data |
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95fc7512 | 1 | #include "cache.h" |
85023577 | 2 | #include "refs.h" |
cf0adba7 JH |
3 | #include "object.h" |
4 | #include "tag.h" | |
7155b727 | 5 | #include "dir.h" |
95fc7512 | 6 | |
f4204ab9 JH |
7 | /* ISSYMREF=01 and ISPACKED=02 are public interfaces */ |
8 | #define REF_KNOWS_PEELED 04 | |
e01de1c9 | 9 | #define REF_BROKEN 010 |
f4204ab9 | 10 | |
e9c4c111 | 11 | struct ref_entry { |
f4204ab9 | 12 | unsigned char flag; /* ISSYMREF? ISPACKED? */ |
e1e22e37 | 13 | unsigned char sha1[20]; |
f4204ab9 | 14 | unsigned char peeled[20]; |
e1e22e37 LT |
15 | char name[FLEX_ARRAY]; |
16 | }; | |
17 | ||
e9c4c111 JP |
18 | struct ref_array { |
19 | int nr, alloc; | |
20 | struct ref_entry **refs; | |
21 | }; | |
22 | ||
f4204ab9 | 23 | static const char *parse_ref_line(char *line, unsigned char *sha1) |
e1e22e37 LT |
24 | { |
25 | /* | |
26 | * 42: the answer to everything. | |
27 | * | |
28 | * In this case, it happens to be the answer to | |
29 | * 40 (length of sha1 hex representation) | |
30 | * +1 (space in between hex and name) | |
31 | * +1 (newline at the end of the line) | |
32 | */ | |
33 | int len = strlen(line) - 42; | |
34 | ||
35 | if (len <= 0) | |
36 | return NULL; | |
37 | if (get_sha1_hex(line, sha1) < 0) | |
38 | return NULL; | |
39 | if (!isspace(line[40])) | |
40 | return NULL; | |
41 | line += 41; | |
f4204ab9 JH |
42 | if (isspace(*line)) |
43 | return NULL; | |
e1e22e37 LT |
44 | if (line[len] != '\n') |
45 | return NULL; | |
46 | line[len] = 0; | |
cf0adba7 | 47 | |
e1e22e37 LT |
48 | return line; |
49 | } | |
50 | ||
e9c4c111 JP |
51 | static void add_ref(const char *name, const unsigned char *sha1, |
52 | int flag, struct ref_array *refs, | |
53 | struct ref_entry **new_entry) | |
e1e22e37 LT |
54 | { |
55 | int len; | |
e9c4c111 | 56 | struct ref_entry *entry; |
e1e22e37 LT |
57 | |
58 | /* Allocate it and add it in.. */ | |
59 | len = strlen(name) + 1; | |
e9c4c111 | 60 | entry = xmalloc(sizeof(struct ref_entry) + len); |
e1e22e37 | 61 | hashcpy(entry->sha1, sha1); |
f4204ab9 | 62 | hashclr(entry->peeled); |
e1e22e37 | 63 | memcpy(entry->name, name, len); |
8da19775 | 64 | entry->flag = flag; |
f4204ab9 JH |
65 | if (new_entry) |
66 | *new_entry = entry; | |
e9c4c111 JP |
67 | ALLOC_GROW(refs->refs, refs->nr + 1, refs->alloc); |
68 | refs->refs[refs->nr++] = entry; | |
c774aab9 JP |
69 | } |
70 | ||
e9c4c111 | 71 | static int ref_entry_cmp(const void *a, const void *b) |
c774aab9 | 72 | { |
e9c4c111 JP |
73 | struct ref_entry *one = *(struct ref_entry **)a; |
74 | struct ref_entry *two = *(struct ref_entry **)b; | |
75 | return strcmp(one->name, two->name); | |
76 | } | |
c774aab9 | 77 | |
e9c4c111 JP |
78 | static void sort_ref_array(struct ref_array *array) |
79 | { | |
80 | int i = 0, j = 1; | |
81 | ||
82 | /* Nothing to sort unless there are at least two entries */ | |
83 | if (array->nr < 2) | |
84 | return; | |
85 | ||
86 | qsort(array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp); | |
87 | ||
88 | /* Remove any duplicates from the ref_array */ | |
89 | for (; j < array->nr; j++) { | |
90 | struct ref_entry *a = array->refs[i]; | |
91 | struct ref_entry *b = array->refs[j]; | |
92 | if (!strcmp(a->name, b->name)) { | |
93 | if (hashcmp(a->sha1, b->sha1)) | |
94 | die("Duplicated ref, and SHA1s don't match: %s", | |
95 | a->name); | |
96 | warning("Duplicated ref: %s", a->name); | |
97 | continue; | |
98 | } | |
99 | i++; | |
100 | array->refs[i] = array->refs[j]; | |
101 | } | |
102 | array->nr = i + 1; | |
103 | } | |
c774aab9 | 104 | |
e9c4c111 JP |
105 | static struct ref_entry *search_ref_array(struct ref_array *array, const char *name) |
106 | { | |
107 | struct ref_entry *e, **r; | |
108 | int len; | |
c774aab9 | 109 | |
e9c4c111 JP |
110 | if (name == NULL) |
111 | return NULL; | |
c774aab9 | 112 | |
68729696 BC |
113 | if (!array->nr) |
114 | return NULL; | |
115 | ||
e9c4c111 JP |
116 | len = strlen(name) + 1; |
117 | e = xmalloc(sizeof(struct ref_entry) + len); | |
118 | memcpy(e->name, name, len); | |
c774aab9 | 119 | |
e9c4c111 | 120 | r = bsearch(&e, array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp); |
c774aab9 | 121 | |
e9c4c111 | 122 | free(e); |
c774aab9 | 123 | |
e9c4c111 JP |
124 | if (r == NULL) |
125 | return NULL; | |
c774aab9 | 126 | |
e9c4c111 | 127 | return *r; |
e1e22e37 LT |
128 | } |
129 | ||
5e290ff7 JH |
130 | /* |
131 | * Future: need to be in "struct repository" | |
132 | * when doing a full libification. | |
133 | */ | |
4175e9e3 | 134 | static struct cached_refs { |
5e290ff7 JH |
135 | char did_loose; |
136 | char did_packed; | |
e9c4c111 JP |
137 | struct ref_array loose; |
138 | struct ref_array packed; | |
0bad611b | 139 | } cached_refs, submodule_refs; |
e9c4c111 | 140 | static struct ref_entry *current_ref; |
5e290ff7 | 141 | |
e9c4c111 | 142 | static struct ref_array extra_refs; |
e142a3c6 | 143 | |
e9c4c111 | 144 | static void free_ref_array(struct ref_array *array) |
5e290ff7 | 145 | { |
e9c4c111 JP |
146 | int i; |
147 | for (i = 0; i < array->nr; i++) | |
148 | free(array->refs[i]); | |
149 | free(array->refs); | |
150 | array->nr = array->alloc = 0; | |
151 | array->refs = NULL; | |
5e290ff7 JH |
152 | } |
153 | ||
154 | static void invalidate_cached_refs(void) | |
e1e22e37 | 155 | { |
5e290ff7 JH |
156 | struct cached_refs *ca = &cached_refs; |
157 | ||
e9c4c111 JP |
158 | if (ca->did_loose) |
159 | free_ref_array(&ca->loose); | |
160 | if (ca->did_packed) | |
161 | free_ref_array(&ca->packed); | |
5e290ff7 JH |
162 | ca->did_loose = ca->did_packed = 0; |
163 | } | |
e1e22e37 | 164 | |
f4204ab9 JH |
165 | static void read_packed_refs(FILE *f, struct cached_refs *cached_refs) |
166 | { | |
e9c4c111 | 167 | struct ref_entry *last = NULL; |
f4204ab9 JH |
168 | char refline[PATH_MAX]; |
169 | int flag = REF_ISPACKED; | |
170 | ||
171 | while (fgets(refline, sizeof(refline), f)) { | |
172 | unsigned char sha1[20]; | |
173 | const char *name; | |
174 | static const char header[] = "# pack-refs with:"; | |
175 | ||
176 | if (!strncmp(refline, header, sizeof(header)-1)) { | |
177 | const char *traits = refline + sizeof(header) - 1; | |
178 | if (strstr(traits, " peeled ")) | |
179 | flag |= REF_KNOWS_PEELED; | |
180 | /* perhaps other traits later as well */ | |
181 | continue; | |
182 | } | |
183 | ||
184 | name = parse_ref_line(refline, sha1); | |
185 | if (name) { | |
e9c4c111 | 186 | add_ref(name, sha1, flag, &cached_refs->packed, &last); |
f4204ab9 JH |
187 | continue; |
188 | } | |
189 | if (last && | |
190 | refline[0] == '^' && | |
191 | strlen(refline) == 42 && | |
192 | refline[41] == '\n' && | |
193 | !get_sha1_hex(refline + 1, sha1)) | |
194 | hashcpy(last->peeled, sha1); | |
195 | } | |
e9c4c111 | 196 | sort_ref_array(&cached_refs->packed); |
f4204ab9 JH |
197 | } |
198 | ||
e142a3c6 DB |
199 | void add_extra_ref(const char *name, const unsigned char *sha1, int flag) |
200 | { | |
e9c4c111 | 201 | add_ref(name, sha1, flag, &extra_refs, NULL); |
e142a3c6 DB |
202 | } |
203 | ||
204 | void clear_extra_refs(void) | |
205 | { | |
e9c4c111 | 206 | free_ref_array(&extra_refs); |
e142a3c6 DB |
207 | } |
208 | ||
e9c4c111 | 209 | static struct ref_array *get_packed_refs(const char *submodule) |
5e290ff7 | 210 | { |
0bad611b HV |
211 | const char *packed_refs_file; |
212 | struct cached_refs *refs; | |
213 | ||
214 | if (submodule) { | |
215 | packed_refs_file = git_path_submodule(submodule, "packed-refs"); | |
216 | refs = &submodule_refs; | |
e9c4c111 | 217 | free_ref_array(&refs->packed); |
0bad611b HV |
218 | } else { |
219 | packed_refs_file = git_path("packed-refs"); | |
220 | refs = &cached_refs; | |
221 | } | |
222 | ||
223 | if (!refs->did_packed || submodule) { | |
224 | FILE *f = fopen(packed_refs_file, "r"); | |
e1e22e37 | 225 | if (f) { |
0bad611b | 226 | read_packed_refs(f, refs); |
e1e22e37 | 227 | fclose(f); |
e1e22e37 | 228 | } |
0bad611b | 229 | refs->did_packed = 1; |
e1e22e37 | 230 | } |
e9c4c111 | 231 | return &refs->packed; |
e1e22e37 LT |
232 | } |
233 | ||
e9c4c111 JP |
234 | static void get_ref_dir(const char *submodule, const char *base, |
235 | struct ref_array *array) | |
e1e22e37 | 236 | { |
0bad611b HV |
237 | DIR *dir; |
238 | const char *path; | |
239 | ||
240 | if (submodule) | |
241 | path = git_path_submodule(submodule, "%s", base); | |
242 | else | |
243 | path = git_path("%s", base); | |
244 | ||
245 | ||
246 | dir = opendir(path); | |
e1e22e37 LT |
247 | |
248 | if (dir) { | |
249 | struct dirent *de; | |
250 | int baselen = strlen(base); | |
ed378ec7 | 251 | char *ref = xmalloc(baselen + 257); |
e1e22e37 | 252 | |
ed378ec7 | 253 | memcpy(ref, base, baselen); |
e1e22e37 | 254 | if (baselen && base[baselen-1] != '/') |
ed378ec7 | 255 | ref[baselen++] = '/'; |
e1e22e37 LT |
256 | |
257 | while ((de = readdir(dir)) != NULL) { | |
258 | unsigned char sha1[20]; | |
259 | struct stat st; | |
8da19775 | 260 | int flag; |
e1e22e37 | 261 | int namelen; |
0bad611b | 262 | const char *refdir; |
e1e22e37 LT |
263 | |
264 | if (de->d_name[0] == '.') | |
265 | continue; | |
266 | namelen = strlen(de->d_name); | |
267 | if (namelen > 255) | |
268 | continue; | |
269 | if (has_extension(de->d_name, ".lock")) | |
270 | continue; | |
ed378ec7 | 271 | memcpy(ref + baselen, de->d_name, namelen+1); |
0bad611b HV |
272 | refdir = submodule |
273 | ? git_path_submodule(submodule, "%s", ref) | |
274 | : git_path("%s", ref); | |
275 | if (stat(refdir, &st) < 0) | |
e1e22e37 LT |
276 | continue; |
277 | if (S_ISDIR(st.st_mode)) { | |
e9c4c111 | 278 | get_ref_dir(submodule, ref, array); |
e1e22e37 LT |
279 | continue; |
280 | } | |
0bad611b | 281 | if (submodule) { |
f8948e2f | 282 | hashclr(sha1); |
0bad611b HV |
283 | flag = 0; |
284 | if (resolve_gitlink_ref(submodule, ref, sha1) < 0) { | |
285 | hashclr(sha1); | |
286 | flag |= REF_BROKEN; | |
287 | } | |
288 | } else | |
289 | if (!resolve_ref(ref, sha1, 1, &flag)) { | |
290 | hashclr(sha1); | |
291 | flag |= REF_BROKEN; | |
292 | } | |
e9c4c111 | 293 | add_ref(ref, sha1, flag, array, NULL); |
e1e22e37 | 294 | } |
ed378ec7 | 295 | free(ref); |
e1e22e37 LT |
296 | closedir(dir); |
297 | } | |
e1e22e37 LT |
298 | } |
299 | ||
f8948e2f | 300 | struct warn_if_dangling_data { |
3cf6134a | 301 | FILE *fp; |
f8948e2f JH |
302 | const char *refname; |
303 | const char *msg_fmt; | |
304 | }; | |
305 | ||
306 | static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1, | |
307 | int flags, void *cb_data) | |
308 | { | |
309 | struct warn_if_dangling_data *d = cb_data; | |
310 | const char *resolves_to; | |
311 | unsigned char junk[20]; | |
312 | ||
313 | if (!(flags & REF_ISSYMREF)) | |
314 | return 0; | |
315 | ||
316 | resolves_to = resolve_ref(refname, junk, 0, NULL); | |
317 | if (!resolves_to || strcmp(resolves_to, d->refname)) | |
318 | return 0; | |
319 | ||
3cf6134a | 320 | fprintf(d->fp, d->msg_fmt, refname); |
f8948e2f JH |
321 | return 0; |
322 | } | |
323 | ||
3cf6134a | 324 | void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname) |
f8948e2f | 325 | { |
66dbfd55 GV |
326 | struct warn_if_dangling_data data; |
327 | ||
328 | data.fp = fp; | |
329 | data.refname = refname; | |
330 | data.msg_fmt = msg_fmt; | |
f8948e2f JH |
331 | for_each_rawref(warn_if_dangling_symref, &data); |
332 | } | |
333 | ||
e9c4c111 | 334 | static struct ref_array *get_loose_refs(const char *submodule) |
e1e22e37 | 335 | { |
0bad611b | 336 | if (submodule) { |
e9c4c111 JP |
337 | free_ref_array(&submodule_refs.loose); |
338 | get_ref_dir(submodule, "refs", &submodule_refs.loose); | |
339 | sort_ref_array(&submodule_refs.loose); | |
340 | return &submodule_refs.loose; | |
0bad611b HV |
341 | } |
342 | ||
5e290ff7 | 343 | if (!cached_refs.did_loose) { |
e9c4c111 JP |
344 | get_ref_dir(NULL, "refs", &cached_refs.loose); |
345 | sort_ref_array(&cached_refs.loose); | |
5e290ff7 | 346 | cached_refs.did_loose = 1; |
e1e22e37 | 347 | } |
e9c4c111 | 348 | return &cached_refs.loose; |
e1e22e37 LT |
349 | } |
350 | ||
ca8db142 LT |
351 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
352 | #define MAXDEPTH 5 | |
0ebde32c LT |
353 | #define MAXREFLEN (1024) |
354 | ||
355 | static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result) | |
356 | { | |
357 | FILE *f; | |
358 | struct cached_refs refs; | |
e9c4c111 JP |
359 | struct ref_entry *ref; |
360 | int retval = -1; | |
0ebde32c LT |
361 | |
362 | strcpy(name + pathlen, "packed-refs"); | |
363 | f = fopen(name, "r"); | |
364 | if (!f) | |
365 | return -1; | |
43d20a8c | 366 | memset(&refs, 0, sizeof(refs)); |
0ebde32c LT |
367 | read_packed_refs(f, &refs); |
368 | fclose(f); | |
e9c4c111 JP |
369 | ref = search_ref_array(&refs.packed, refname); |
370 | if (ref != NULL) { | |
371 | memcpy(result, ref->sha1, 20); | |
372 | retval = 0; | |
0ebde32c | 373 | } |
e9c4c111 | 374 | free_ref_array(&refs.packed); |
0ebde32c LT |
375 | return retval; |
376 | } | |
377 | ||
378 | static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion) | |
379 | { | |
380 | int fd, len = strlen(refname); | |
381 | char buffer[128], *p; | |
382 | ||
383 | if (recursion > MAXDEPTH || len > MAXREFLEN) | |
384 | return -1; | |
385 | memcpy(name + pathlen, refname, len+1); | |
386 | fd = open(name, O_RDONLY); | |
387 | if (fd < 0) | |
388 | return resolve_gitlink_packed_ref(name, pathlen, refname, result); | |
389 | ||
390 | len = read(fd, buffer, sizeof(buffer)-1); | |
391 | close(fd); | |
392 | if (len < 0) | |
393 | return -1; | |
394 | while (len && isspace(buffer[len-1])) | |
395 | len--; | |
396 | buffer[len] = 0; | |
397 | ||
398 | /* Was it a detached head or an old-fashioned symlink? */ | |
399 | if (!get_sha1_hex(buffer, result)) | |
400 | return 0; | |
401 | ||
402 | /* Symref? */ | |
403 | if (strncmp(buffer, "ref:", 4)) | |
404 | return -1; | |
405 | p = buffer + 4; | |
406 | while (isspace(*p)) | |
407 | p++; | |
408 | ||
409 | return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1); | |
410 | } | |
411 | ||
412 | int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result) | |
413 | { | |
414 | int len = strlen(path), retval; | |
415 | char *gitdir; | |
842abf06 | 416 | const char *tmp; |
0ebde32c LT |
417 | |
418 | while (len && path[len-1] == '/') | |
419 | len--; | |
420 | if (!len) | |
421 | return -1; | |
422 | gitdir = xmalloc(len + MAXREFLEN + 8); | |
423 | memcpy(gitdir, path, len); | |
842abf06 LH |
424 | memcpy(gitdir + len, "/.git", 6); |
425 | len += 5; | |
426 | ||
427 | tmp = read_gitfile_gently(gitdir); | |
428 | if (tmp) { | |
429 | free(gitdir); | |
430 | len = strlen(tmp); | |
431 | gitdir = xmalloc(len + MAXREFLEN + 3); | |
432 | memcpy(gitdir, tmp, len); | |
433 | } | |
434 | gitdir[len] = '/'; | |
435 | gitdir[++len] = '\0'; | |
436 | retval = resolve_gitlink_ref_recursive(gitdir, len, refname, result, 0); | |
0ebde32c LT |
437 | free(gitdir); |
438 | return retval; | |
439 | } | |
ca8db142 | 440 | |
4886b89f CC |
441 | /* |
442 | * If the "reading" argument is set, this function finds out what _object_ | |
443 | * the ref points at by "reading" the ref. The ref, if it is not symbolic, | |
444 | * has to exist, and if it is symbolic, it has to point at an existing ref, | |
445 | * because the "read" goes through the symref to the ref it points at. | |
446 | * | |
447 | * The access that is not "reading" may often be "writing", but does not | |
448 | * have to; it can be merely checking _where it leads to_. If it is a | |
449 | * prelude to "writing" to the ref, a write to a symref that points at | |
450 | * yet-to-be-born ref will create the real ref pointed by the symref. | |
451 | * reading=0 allows the caller to check where such a symref leads to. | |
452 | */ | |
8da19775 | 453 | const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 454 | { |
0104ca09 HO |
455 | int depth = MAXDEPTH; |
456 | ssize_t len; | |
a876ed83 | 457 | char buffer[256]; |
ed378ec7 | 458 | static char ref_buffer[256]; |
ca8db142 | 459 | |
8da19775 JH |
460 | if (flag) |
461 | *flag = 0; | |
462 | ||
a876ed83 | 463 | for (;;) { |
958a4789 | 464 | char path[PATH_MAX]; |
a876ed83 JH |
465 | struct stat st; |
466 | char *buf; | |
467 | int fd; | |
8a65ff76 | 468 | |
a876ed83 JH |
469 | if (--depth < 0) |
470 | return NULL; | |
ca8db142 | 471 | |
958a4789 | 472 | git_snpath(path, sizeof(path), "%s", ref); |
4886b89f | 473 | /* Special case: non-existing file. */ |
a876ed83 | 474 | if (lstat(path, &st) < 0) { |
e9c4c111 JP |
475 | struct ref_array *packed = get_packed_refs(NULL); |
476 | struct ref_entry *r = search_ref_array(packed, ref); | |
477 | if (r != NULL) { | |
478 | hashcpy(sha1, r->sha1); | |
479 | if (flag) | |
480 | *flag |= REF_ISPACKED; | |
481 | return ref; | |
434cd0cd | 482 | } |
a876ed83 JH |
483 | if (reading || errno != ENOENT) |
484 | return NULL; | |
e702496e | 485 | hashclr(sha1); |
ed378ec7 | 486 | return ref; |
a876ed83 | 487 | } |
ca8db142 | 488 | |
a876ed83 JH |
489 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
490 | if (S_ISLNK(st.st_mode)) { | |
491 | len = readlink(path, buffer, sizeof(buffer)-1); | |
492 | if (len >= 5 && !memcmp("refs/", buffer, 5)) { | |
ed378ec7 LT |
493 | buffer[len] = 0; |
494 | strcpy(ref_buffer, buffer); | |
495 | ref = ref_buffer; | |
8da19775 JH |
496 | if (flag) |
497 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
498 | continue; |
499 | } | |
ca8db142 | 500 | } |
a876ed83 | 501 | |
7a21632f DS |
502 | /* Is it a directory? */ |
503 | if (S_ISDIR(st.st_mode)) { | |
504 | errno = EISDIR; | |
505 | return NULL; | |
506 | } | |
507 | ||
a876ed83 JH |
508 | /* |
509 | * Anything else, just open it and try to use it as | |
510 | * a ref | |
511 | */ | |
512 | fd = open(path, O_RDONLY); | |
513 | if (fd < 0) | |
514 | return NULL; | |
93d26e4c | 515 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
a876ed83 JH |
516 | close(fd); |
517 | ||
518 | /* | |
519 | * Is it a symbolic ref? | |
520 | */ | |
521 | if (len < 4 || memcmp("ref:", buffer, 4)) | |
522 | break; | |
523 | buf = buffer + 4; | |
524 | len -= 4; | |
525 | while (len && isspace(*buf)) | |
526 | buf++, len--; | |
527 | while (len && isspace(buf[len-1])) | |
ed378ec7 LT |
528 | len--; |
529 | buf[len] = 0; | |
530 | memcpy(ref_buffer, buf, len + 1); | |
531 | ref = ref_buffer; | |
8da19775 JH |
532 | if (flag) |
533 | *flag |= REF_ISSYMREF; | |
8a65ff76 | 534 | } |
a876ed83 JH |
535 | if (len < 40 || get_sha1_hex(buffer, sha1)) |
536 | return NULL; | |
ed378ec7 | 537 | return ref; |
a876ed83 JH |
538 | } |
539 | ||
d08bae7e IL |
540 | /* The argument to filter_refs */ |
541 | struct ref_filter { | |
542 | const char *pattern; | |
543 | each_ref_fn *fn; | |
544 | void *cb_data; | |
545 | }; | |
546 | ||
ed378ec7 | 547 | int read_ref(const char *ref, unsigned char *sha1) |
a876ed83 | 548 | { |
8da19775 | 549 | if (resolve_ref(ref, sha1, 1, NULL)) |
a876ed83 JH |
550 | return 0; |
551 | return -1; | |
8a65ff76 LT |
552 | } |
553 | ||
f8948e2f | 554 | #define DO_FOR_EACH_INCLUDE_BROKEN 01 |
ef06b918 | 555 | static int do_one_ref(const char *base, each_ref_fn fn, int trim, |
e9c4c111 | 556 | int flags, void *cb_data, struct ref_entry *entry) |
ef06b918 JH |
557 | { |
558 | if (strncmp(base, entry->name, trim)) | |
559 | return 0; | |
e01de1c9 | 560 | |
f8948e2f | 561 | if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) { |
e01de1c9 JH |
562 | if (entry->flag & REF_BROKEN) |
563 | return 0; /* ignore dangling symref */ | |
f8948e2f JH |
564 | if (!has_sha1_file(entry->sha1)) { |
565 | error("%s does not point to a valid object!", entry->name); | |
566 | return 0; | |
567 | } | |
ef06b918 | 568 | } |
0ae91be0 | 569 | current_ref = entry; |
ef06b918 JH |
570 | return fn(entry->name + trim, entry->sha1, entry->flag, cb_data); |
571 | } | |
572 | ||
d08bae7e IL |
573 | static int filter_refs(const char *ref, const unsigned char *sha, int flags, |
574 | void *data) | |
575 | { | |
576 | struct ref_filter *filter = (struct ref_filter *)data; | |
577 | if (fnmatch(filter->pattern, ref, 0)) | |
578 | return 0; | |
579 | return filter->fn(ref, sha, flags, filter->cb_data); | |
580 | } | |
581 | ||
cf0adba7 JH |
582 | int peel_ref(const char *ref, unsigned char *sha1) |
583 | { | |
584 | int flag; | |
585 | unsigned char base[20]; | |
586 | struct object *o; | |
587 | ||
0ae91be0 SP |
588 | if (current_ref && (current_ref->name == ref |
589 | || !strcmp(current_ref->name, ref))) { | |
590 | if (current_ref->flag & REF_KNOWS_PEELED) { | |
591 | hashcpy(sha1, current_ref->peeled); | |
592 | return 0; | |
593 | } | |
594 | hashcpy(base, current_ref->sha1); | |
595 | goto fallback; | |
596 | } | |
597 | ||
cf0adba7 JH |
598 | if (!resolve_ref(ref, base, 1, &flag)) |
599 | return -1; | |
600 | ||
601 | if ((flag & REF_ISPACKED)) { | |
e9c4c111 JP |
602 | struct ref_array *array = get_packed_refs(NULL); |
603 | struct ref_entry *r = search_ref_array(array, ref); | |
cf0adba7 | 604 | |
e9c4c111 JP |
605 | if (r != NULL && r->flag & REF_KNOWS_PEELED) { |
606 | hashcpy(sha1, r->peeled); | |
607 | return 0; | |
cf0adba7 | 608 | } |
cf0adba7 JH |
609 | } |
610 | ||
0ae91be0 | 611 | fallback: |
cf0adba7 | 612 | o = parse_object(base); |
8c87dc77 | 613 | if (o && o->type == OBJ_TAG) { |
cf0adba7 JH |
614 | o = deref_tag(o, ref, 0); |
615 | if (o) { | |
616 | hashcpy(sha1, o->sha1); | |
617 | return 0; | |
618 | } | |
619 | } | |
620 | return -1; | |
621 | } | |
622 | ||
0bad611b HV |
623 | static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn, |
624 | int trim, int flags, void *cb_data) | |
8a65ff76 | 625 | { |
e9c4c111 JP |
626 | int retval = 0, i, p = 0, l = 0; |
627 | struct ref_array *packed = get_packed_refs(submodule); | |
628 | struct ref_array *loose = get_loose_refs(submodule); | |
8a65ff76 | 629 | |
e9c4c111 | 630 | struct ref_array *extra = &extra_refs; |
e142a3c6 | 631 | |
e9c4c111 JP |
632 | for (i = 0; i < extra->nr; i++) |
633 | retval = do_one_ref(base, fn, trim, flags, cb_data, extra->refs[i]); | |
e142a3c6 | 634 | |
e9c4c111 JP |
635 | while (p < packed->nr && l < loose->nr) { |
636 | struct ref_entry *entry; | |
637 | int cmp = strcmp(packed->refs[p]->name, loose->refs[l]->name); | |
e1e22e37 | 638 | if (!cmp) { |
e9c4c111 | 639 | p++; |
e1e22e37 | 640 | continue; |
6cada6a9 | 641 | } |
e1e22e37 | 642 | if (cmp > 0) { |
e9c4c111 | 643 | entry = loose->refs[l++]; |
e1e22e37 | 644 | } else { |
e9c4c111 | 645 | entry = packed->refs[p++]; |
e1e22e37 | 646 | } |
f8948e2f | 647 | retval = do_one_ref(base, fn, trim, flags, cb_data, entry); |
e1e22e37 | 648 | if (retval) |
0ae91be0 | 649 | goto end_each; |
e1e22e37 | 650 | } |
8a65ff76 | 651 | |
e9c4c111 JP |
652 | if (l < loose->nr) { |
653 | p = l; | |
654 | packed = loose; | |
655 | } | |
656 | ||
657 | for (; p < packed->nr; p++) { | |
658 | retval = do_one_ref(base, fn, trim, flags, cb_data, packed->refs[p]); | |
ef06b918 | 659 | if (retval) |
0ae91be0 | 660 | goto end_each; |
8a65ff76 | 661 | } |
0ae91be0 SP |
662 | |
663 | end_each: | |
664 | current_ref = NULL; | |
665 | return retval; | |
8a65ff76 LT |
666 | } |
667 | ||
0bad611b HV |
668 | |
669 | static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data) | |
723c31fe LT |
670 | { |
671 | unsigned char sha1[20]; | |
8da19775 JH |
672 | int flag; |
673 | ||
0bad611b HV |
674 | if (submodule) { |
675 | if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0) | |
676 | return fn("HEAD", sha1, 0, cb_data); | |
677 | ||
678 | return 0; | |
679 | } | |
680 | ||
8da19775 JH |
681 | if (resolve_ref("HEAD", sha1, 1, &flag)) |
682 | return fn("HEAD", sha1, flag, cb_data); | |
0bad611b | 683 | |
2f34ba32 | 684 | return 0; |
723c31fe LT |
685 | } |
686 | ||
0bad611b HV |
687 | int head_ref(each_ref_fn fn, void *cb_data) |
688 | { | |
689 | return do_head_ref(NULL, fn, cb_data); | |
690 | } | |
691 | ||
9ef6aeb0 HV |
692 | int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
693 | { | |
694 | return do_head_ref(submodule, fn, cb_data); | |
695 | } | |
696 | ||
cb5d709f | 697 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 698 | { |
0bad611b | 699 | return do_for_each_ref(NULL, "refs/", fn, 0, 0, cb_data); |
a62be77f SE |
700 | } |
701 | ||
9ef6aeb0 HV |
702 | int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
703 | { | |
704 | return do_for_each_ref(submodule, "refs/", fn, 0, 0, cb_data); | |
a62be77f SE |
705 | } |
706 | ||
2a8177b6 CC |
707 | int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data) |
708 | { | |
0bad611b | 709 | return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data); |
2a8177b6 CC |
710 | } |
711 | ||
9ef6aeb0 HV |
712 | int for_each_ref_in_submodule(const char *submodule, const char *prefix, |
713 | each_ref_fn fn, void *cb_data) | |
714 | { | |
715 | return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data); | |
2a8177b6 CC |
716 | } |
717 | ||
cb5d709f | 718 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 719 | { |
2a8177b6 | 720 | return for_each_ref_in("refs/tags/", fn, cb_data); |
a62be77f SE |
721 | } |
722 | ||
9ef6aeb0 HV |
723 | int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
724 | { | |
725 | return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data); | |
726 | } | |
727 | ||
cb5d709f | 728 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 729 | { |
2a8177b6 | 730 | return for_each_ref_in("refs/heads/", fn, cb_data); |
a62be77f SE |
731 | } |
732 | ||
9ef6aeb0 HV |
733 | int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
734 | { | |
735 | return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data); | |
736 | } | |
737 | ||
cb5d709f | 738 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 739 | { |
2a8177b6 | 740 | return for_each_ref_in("refs/remotes/", fn, cb_data); |
f8948e2f JH |
741 | } |
742 | ||
9ef6aeb0 HV |
743 | int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
744 | { | |
745 | return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data); | |
746 | } | |
747 | ||
29268700 CC |
748 | int for_each_replace_ref(each_ref_fn fn, void *cb_data) |
749 | { | |
0bad611b | 750 | return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data); |
29268700 CC |
751 | } |
752 | ||
b09fe971 IL |
753 | int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, |
754 | const char *prefix, void *cb_data) | |
d08bae7e IL |
755 | { |
756 | struct strbuf real_pattern = STRBUF_INIT; | |
757 | struct ref_filter filter; | |
d08bae7e IL |
758 | int ret; |
759 | ||
b09fe971 | 760 | if (!prefix && prefixcmp(pattern, "refs/")) |
d08bae7e | 761 | strbuf_addstr(&real_pattern, "refs/"); |
b09fe971 IL |
762 | else if (prefix) |
763 | strbuf_addstr(&real_pattern, prefix); | |
d08bae7e IL |
764 | strbuf_addstr(&real_pattern, pattern); |
765 | ||
894a9d33 | 766 | if (!has_glob_specials(pattern)) { |
9517e6b8 | 767 | /* Append implied '/' '*' if not present. */ |
d08bae7e IL |
768 | if (real_pattern.buf[real_pattern.len - 1] != '/') |
769 | strbuf_addch(&real_pattern, '/'); | |
770 | /* No need to check for '*', there is none. */ | |
771 | strbuf_addch(&real_pattern, '*'); | |
772 | } | |
773 | ||
774 | filter.pattern = real_pattern.buf; | |
775 | filter.fn = fn; | |
776 | filter.cb_data = cb_data; | |
777 | ret = for_each_ref(filter_refs, &filter); | |
778 | ||
779 | strbuf_release(&real_pattern); | |
780 | return ret; | |
781 | } | |
782 | ||
b09fe971 IL |
783 | int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data) |
784 | { | |
785 | return for_each_glob_ref_in(fn, pattern, NULL, cb_data); | |
786 | } | |
787 | ||
f8948e2f JH |
788 | int for_each_rawref(each_ref_fn fn, void *cb_data) |
789 | { | |
0bad611b | 790 | return do_for_each_ref(NULL, "refs/", fn, 0, |
f8948e2f | 791 | DO_FOR_EACH_INCLUDE_BROKEN, cb_data); |
8a65ff76 LT |
792 | } |
793 | ||
03feddd6 JH |
794 | /* |
795 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
796 | * We do not like it if: | |
797 | * | |
798 | * - any path component of it begins with ".", or | |
799 | * - it has double dots "..", or | |
800 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
801 | * - it ends with a "/". | |
3e262b95 | 802 | * - it ends with ".lock" |
a4c2e699 | 803 | * - it contains a "\" (backslash) |
03feddd6 JH |
804 | */ |
805 | ||
806 | static inline int bad_ref_char(int ch) | |
807 | { | |
8558fd9e | 808 | if (((unsigned) ch) <= ' ' || |
a4c2e699 | 809 | ch == '~' || ch == '^' || ch == ':' || ch == '\\') |
8558fd9e DB |
810 | return 1; |
811 | /* 2.13 Pattern Matching Notation */ | |
812 | if (ch == '?' || ch == '[') /* Unsupported */ | |
813 | return 1; | |
814 | if (ch == '*') /* Supported at the end */ | |
815 | return 2; | |
816 | return 0; | |
03feddd6 JH |
817 | } |
818 | ||
95fc7512 DB |
819 | int check_ref_format(const char *ref) |
820 | { | |
cbdffe40 | 821 | int ch, level, bad_type, last; |
abd2bde7 | 822 | int ret = CHECK_REF_FORMAT_OK; |
03feddd6 JH |
823 | const char *cp = ref; |
824 | ||
825 | level = 0; | |
826 | while (1) { | |
827 | while ((ch = *cp++) == '/') | |
828 | ; /* tolerate duplicated slashes */ | |
829 | if (!ch) | |
5f7b202a JH |
830 | /* should not end with slashes */ |
831 | return CHECK_REF_FORMAT_ERROR; | |
03feddd6 JH |
832 | |
833 | /* we are at the beginning of the path component */ | |
8558fd9e | 834 | if (ch == '.') |
5f7b202a | 835 | return CHECK_REF_FORMAT_ERROR; |
8558fd9e DB |
836 | bad_type = bad_ref_char(ch); |
837 | if (bad_type) { | |
abd2bde7 DB |
838 | if (bad_type == 2 && (!*cp || *cp == '/') && |
839 | ret == CHECK_REF_FORMAT_OK) | |
840 | ret = CHECK_REF_FORMAT_WILDCARD; | |
841 | else | |
842 | return CHECK_REF_FORMAT_ERROR; | |
8558fd9e | 843 | } |
03feddd6 | 844 | |
cbdffe40 | 845 | last = ch; |
03feddd6 JH |
846 | /* scan the rest of the path component */ |
847 | while ((ch = *cp++) != 0) { | |
8558fd9e | 848 | bad_type = bad_ref_char(ch); |
cbdffe40 | 849 | if (bad_type) |
08fbdb30 | 850 | return CHECK_REF_FORMAT_ERROR; |
03feddd6 JH |
851 | if (ch == '/') |
852 | break; | |
cbdffe40 JH |
853 | if (last == '.' && ch == '.') |
854 | return CHECK_REF_FORMAT_ERROR; | |
855 | if (last == '@' && ch == '{') | |
5f7b202a | 856 | return CHECK_REF_FORMAT_ERROR; |
cbdffe40 | 857 | last = ch; |
03feddd6 JH |
858 | } |
859 | level++; | |
860 | if (!ch) { | |
cbdffe40 JH |
861 | if (ref <= cp - 2 && cp[-2] == '.') |
862 | return CHECK_REF_FORMAT_ERROR; | |
03feddd6 | 863 | if (level < 2) |
5f7b202a | 864 | return CHECK_REF_FORMAT_ONELEVEL; |
3e262b95 SP |
865 | if (has_extension(ref, ".lock")) |
866 | return CHECK_REF_FORMAT_ERROR; | |
abd2bde7 | 867 | return ret; |
03feddd6 JH |
868 | } |
869 | } | |
95fc7512 DB |
870 | } |
871 | ||
4577e483 | 872 | const char *prettify_refname(const char *name) |
a9c37a72 | 873 | { |
a9c37a72 DB |
874 | return name + ( |
875 | !prefixcmp(name, "refs/heads/") ? 11 : | |
876 | !prefixcmp(name, "refs/tags/") ? 10 : | |
877 | !prefixcmp(name, "refs/remotes/") ? 13 : | |
878 | 0); | |
879 | } | |
880 | ||
79803322 SP |
881 | const char *ref_rev_parse_rules[] = { |
882 | "%.*s", | |
883 | "refs/%.*s", | |
884 | "refs/tags/%.*s", | |
885 | "refs/heads/%.*s", | |
886 | "refs/remotes/%.*s", | |
887 | "refs/remotes/%.*s/HEAD", | |
888 | NULL | |
889 | }; | |
890 | ||
605b4978 SP |
891 | const char *ref_fetch_rules[] = { |
892 | "%.*s", | |
893 | "refs/%.*s", | |
894 | "refs/heads/%.*s", | |
895 | NULL | |
896 | }; | |
897 | ||
79803322 SP |
898 | int refname_match(const char *abbrev_name, const char *full_name, const char **rules) |
899 | { | |
900 | const char **p; | |
901 | const int abbrev_name_len = strlen(abbrev_name); | |
902 | ||
903 | for (p = rules; *p; p++) { | |
904 | if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { | |
905 | return 1; | |
906 | } | |
907 | } | |
908 | ||
909 | return 0; | |
910 | } | |
911 | ||
e5f38ec3 | 912 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
913 | const unsigned char *old_sha1, int mustexist) |
914 | { | |
8da19775 | 915 | if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 916 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
917 | unlock_ref(lock); |
918 | return NULL; | |
919 | } | |
a89fccd2 | 920 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 921 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
922 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
923 | unlock_ref(lock); | |
924 | return NULL; | |
925 | } | |
926 | return lock; | |
927 | } | |
928 | ||
7155b727 | 929 | static int remove_empty_directories(const char *file) |
bc7127ef JH |
930 | { |
931 | /* we want to create a file but there is a directory there; | |
932 | * if that is an empty directory (or a directory that contains | |
933 | * only empty directories), remove them. | |
934 | */ | |
7155b727 JS |
935 | struct strbuf path; |
936 | int result; | |
bc7127ef | 937 | |
7155b727 JS |
938 | strbuf_init(&path, 20); |
939 | strbuf_addstr(&path, file); | |
940 | ||
a0f4afbe | 941 | result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY); |
7155b727 JS |
942 | |
943 | strbuf_release(&path); | |
944 | ||
945 | return result; | |
bc7127ef JH |
946 | } |
947 | ||
c976d415 | 948 | static int is_refname_available(const char *ref, const char *oldref, |
e9c4c111 | 949 | struct ref_array *array, int quiet) |
c976d415 | 950 | { |
e9c4c111 JP |
951 | int i, namlen = strlen(ref); /* e.g. 'foo/bar' */ |
952 | for (i = 0; i < array->nr; i++ ) { | |
953 | struct ref_entry *entry = array->refs[i]; | |
954 | /* entry->name could be 'foo' or 'foo/bar/baz' */ | |
955 | if (!oldref || strcmp(oldref, entry->name)) { | |
956 | int len = strlen(entry->name); | |
c976d415 | 957 | int cmplen = (namlen < len) ? namlen : len; |
e9c4c111 JP |
958 | const char *lead = (namlen < len) ? entry->name : ref; |
959 | if (!strncmp(ref, entry->name, cmplen) && | |
c976d415 LH |
960 | lead[cmplen] == '/') { |
961 | if (!quiet) | |
962 | error("'%s' exists; cannot create '%s'", | |
e9c4c111 | 963 | entry->name, ref); |
c976d415 LH |
964 | return 0; |
965 | } | |
966 | } | |
c976d415 LH |
967 | } |
968 | return 1; | |
969 | } | |
970 | ||
68db31cc | 971 | static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p) |
4bd18c43 | 972 | { |
434cd0cd | 973 | char *ref_file; |
ed378ec7 | 974 | const char *orig_ref = ref; |
4bd18c43 | 975 | struct ref_lock *lock; |
5cc3cef9 | 976 | int last_errno = 0; |
acd3b9ec | 977 | int type, lflags; |
4431fcc4 | 978 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
5bdd8d4a | 979 | int missing = 0; |
4bd18c43 SP |
980 | |
981 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
982 | lock->lock_fd = -1; | |
983 | ||
68db31cc | 984 | ref = resolve_ref(ref, lock->old_sha1, mustexist, &type); |
bc7127ef JH |
985 | if (!ref && errno == EISDIR) { |
986 | /* we are trying to lock foo but we used to | |
987 | * have foo/bar which now does not exist; | |
988 | * it is normal for the empty directory 'foo' | |
989 | * to remain. | |
990 | */ | |
991 | ref_file = git_path("%s", orig_ref); | |
5cc3cef9 JH |
992 | if (remove_empty_directories(ref_file)) { |
993 | last_errno = errno; | |
994 | error("there are still refs under '%s'", orig_ref); | |
995 | goto error_return; | |
996 | } | |
68db31cc | 997 | ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type); |
bc7127ef | 998 | } |
68db31cc SV |
999 | if (type_p) |
1000 | *type_p = type; | |
ed378ec7 | 1001 | if (!ref) { |
5cc3cef9 | 1002 | last_errno = errno; |
818f477c | 1003 | error("unable to resolve reference %s: %s", |
ed378ec7 | 1004 | orig_ref, strerror(errno)); |
5cc3cef9 | 1005 | goto error_return; |
4bd18c43 | 1006 | } |
5bdd8d4a | 1007 | missing = is_null_sha1(lock->old_sha1); |
c976d415 LH |
1008 | /* When the ref did not exist and we are creating it, |
1009 | * make sure there is no existing ref that is packed | |
1010 | * whose name begins with our refname, nor a ref whose | |
1011 | * name is a proper prefix of our refname. | |
1012 | */ | |
5bdd8d4a | 1013 | if (missing && |
0bad611b | 1014 | !is_refname_available(ref, NULL, get_packed_refs(NULL), 0)) { |
f475e08e | 1015 | last_errno = ENOTDIR; |
c976d415 | 1016 | goto error_return; |
f475e08e | 1017 | } |
22a3844e | 1018 | |
c33d5174 | 1019 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 1020 | |
acd3b9ec JH |
1021 | lflags = LOCK_DIE_ON_ERROR; |
1022 | if (flags & REF_NODEREF) { | |
68db31cc | 1023 | ref = orig_ref; |
acd3b9ec JH |
1024 | lflags |= LOCK_NODEREF; |
1025 | } | |
434cd0cd | 1026 | lock->ref_name = xstrdup(ref); |
1655707c | 1027 | lock->orig_ref_name = xstrdup(orig_ref); |
7c1a278d | 1028 | ref_file = git_path("%s", ref); |
5bdd8d4a | 1029 | if (missing) |
68db31cc SV |
1030 | lock->force_write = 1; |
1031 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
1032 | lock->force_write = 1; | |
4bd18c43 | 1033 | |
5cc3cef9 JH |
1034 | if (safe_create_leading_directories(ref_file)) { |
1035 | last_errno = errno; | |
1036 | error("unable to create directory for %s", ref_file); | |
1037 | goto error_return; | |
1038 | } | |
4bd18c43 | 1039 | |
acd3b9ec | 1040 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags); |
4bd18c43 | 1041 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; |
5cc3cef9 JH |
1042 | |
1043 | error_return: | |
1044 | unlock_ref(lock); | |
1045 | errno = last_errno; | |
1046 | return NULL; | |
4bd18c43 SP |
1047 | } |
1048 | ||
4431fcc4 | 1049 | struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1) |
95fc7512 | 1050 | { |
53cce84c | 1051 | char refpath[PATH_MAX]; |
95fc7512 | 1052 | if (check_ref_format(ref)) |
4bd18c43 | 1053 | return NULL; |
53cce84c | 1054 | strcpy(refpath, mkpath("refs/%s", ref)); |
68db31cc | 1055 | return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL); |
4bd18c43 SP |
1056 | } |
1057 | ||
68db31cc | 1058 | struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags) |
4bd18c43 | 1059 | { |
5f7b202a | 1060 | switch (check_ref_format(ref)) { |
5f7b202a | 1061 | default: |
257f3020 JH |
1062 | return NULL; |
1063 | case 0: | |
1064 | case CHECK_REF_FORMAT_ONELEVEL: | |
5f7b202a JH |
1065 | return lock_ref_sha1_basic(ref, old_sha1, flags, NULL); |
1066 | } | |
c0277d15 JH |
1067 | } |
1068 | ||
26a063a1 JH |
1069 | static struct lock_file packlock; |
1070 | ||
c0277d15 JH |
1071 | static int repack_without_ref(const char *refname) |
1072 | { | |
e9c4c111 JP |
1073 | struct ref_array *packed; |
1074 | struct ref_entry *ref; | |
1075 | int fd, i; | |
1076 | ||
1077 | packed = get_packed_refs(NULL); | |
1078 | ref = search_ref_array(packed, refname); | |
1079 | if (ref == NULL) | |
c0277d15 | 1080 | return 0; |
c0277d15 | 1081 | fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0); |
1b018fd9 MV |
1082 | if (fd < 0) { |
1083 | unable_to_lock_error(git_path("packed-refs"), errno); | |
c0277d15 | 1084 | return error("cannot delete '%s' from packed refs", refname); |
1b018fd9 | 1085 | } |
c0277d15 | 1086 | |
e9c4c111 | 1087 | for (i = 0; i < packed->nr; i++) { |
c0277d15 JH |
1088 | char line[PATH_MAX + 100]; |
1089 | int len; | |
1090 | ||
e9c4c111 JP |
1091 | ref = packed->refs[i]; |
1092 | ||
1093 | if (!strcmp(refname, ref->name)) | |
c0277d15 JH |
1094 | continue; |
1095 | len = snprintf(line, sizeof(line), "%s %s\n", | |
e9c4c111 | 1096 | sha1_to_hex(ref->sha1), ref->name); |
c0277d15 JH |
1097 | /* this should not happen but just being defensive */ |
1098 | if (len > sizeof(line)) | |
e9c4c111 | 1099 | die("too long a refname '%s'", ref->name); |
c0277d15 JH |
1100 | write_or_die(fd, line, len); |
1101 | } | |
1102 | return commit_lock_file(&packlock); | |
1103 | } | |
1104 | ||
eca35a25 | 1105 | int delete_ref(const char *refname, const unsigned char *sha1, int delopt) |
c0277d15 JH |
1106 | { |
1107 | struct ref_lock *lock; | |
eca35a25 | 1108 | int err, i = 0, ret = 0, flag = 0; |
c0277d15 | 1109 | |
68db31cc | 1110 | lock = lock_ref_sha1_basic(refname, sha1, 0, &flag); |
c0277d15 JH |
1111 | if (!lock) |
1112 | return 1; | |
045a476f | 1113 | if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) { |
c0277d15 | 1114 | /* loose */ |
eca35a25 MV |
1115 | const char *path; |
1116 | ||
1117 | if (!(delopt & REF_NODEREF)) { | |
1118 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
1119 | lock->lk->filename[i] = 0; | |
1120 | path = lock->lk->filename; | |
1121 | } else { | |
9db56f71 | 1122 | path = git_path("%s", refname); |
eca35a25 | 1123 | } |
691f1a28 AR |
1124 | err = unlink_or_warn(path); |
1125 | if (err && errno != ENOENT) | |
c0277d15 | 1126 | ret = 1; |
691f1a28 | 1127 | |
eca35a25 MV |
1128 | if (!(delopt & REF_NODEREF)) |
1129 | lock->lk->filename[i] = '.'; | |
c0277d15 JH |
1130 | } |
1131 | /* removing the loose one could have resurrected an earlier | |
1132 | * packed one. Also, if it was not loose we need to repack | |
1133 | * without it. | |
1134 | */ | |
1135 | ret |= repack_without_ref(refname); | |
1136 | ||
691f1a28 | 1137 | unlink_or_warn(git_path("logs/%s", lock->ref_name)); |
c0277d15 JH |
1138 | invalidate_cached_refs(); |
1139 | unlock_ref(lock); | |
1140 | return ret; | |
4bd18c43 SP |
1141 | } |
1142 | ||
765c2258 PH |
1143 | /* |
1144 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
1145 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
1146 | * | |
1147 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
1148 | * live into logs/refs. | |
1149 | */ | |
1150 | #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log" | |
1151 | ||
678d0f4c | 1152 | int rename_ref(const char *oldref, const char *newref, const char *logmsg) |
c976d415 LH |
1153 | { |
1154 | static const char renamed_ref[] = "RENAMED-REF"; | |
1155 | unsigned char sha1[20], orig_sha1[20]; | |
1156 | int flag = 0, logmoved = 0; | |
1157 | struct ref_lock *lock; | |
c976d415 | 1158 | struct stat loginfo; |
16c2bfbb | 1159 | int log = !lstat(git_path("logs/%s", oldref), &loginfo); |
eca35a25 | 1160 | const char *symref = NULL; |
c976d415 | 1161 | |
450d4c0f | 1162 | if (log && S_ISLNK(loginfo.st_mode)) |
c976d415 LH |
1163 | return error("reflog for %s is a symlink", oldref); |
1164 | ||
eca35a25 MV |
1165 | symref = resolve_ref(oldref, orig_sha1, 1, &flag); |
1166 | if (flag & REF_ISSYMREF) | |
fa58186c MV |
1167 | return error("refname %s is a symbolic ref, renaming it is not supported", |
1168 | oldref); | |
eca35a25 | 1169 | if (!symref) |
c976d415 LH |
1170 | return error("refname %s not found", oldref); |
1171 | ||
0bad611b | 1172 | if (!is_refname_available(newref, oldref, get_packed_refs(NULL), 0)) |
c976d415 LH |
1173 | return 1; |
1174 | ||
0bad611b | 1175 | if (!is_refname_available(newref, oldref, get_loose_refs(NULL), 0)) |
c976d415 LH |
1176 | return 1; |
1177 | ||
68db31cc | 1178 | lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL); |
c976d415 LH |
1179 | if (!lock) |
1180 | return error("unable to lock %s", renamed_ref); | |
1181 | lock->force_write = 1; | |
678d0f4c | 1182 | if (write_ref_sha1(lock, orig_sha1, logmsg)) |
c976d415 LH |
1183 | return error("unable to save current sha1 in %s", renamed_ref); |
1184 | ||
765c2258 PH |
1185 | if (log && rename(git_path("logs/%s", oldref), git_path(TMP_RENAMED_LOG))) |
1186 | return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s", | |
c976d415 LH |
1187 | oldref, strerror(errno)); |
1188 | ||
eca35a25 | 1189 | if (delete_ref(oldref, orig_sha1, REF_NODEREF)) { |
c976d415 LH |
1190 | error("unable to delete old %s", oldref); |
1191 | goto rollback; | |
1192 | } | |
1193 | ||
eca35a25 | 1194 | if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1, REF_NODEREF)) { |
c976d415 LH |
1195 | if (errno==EISDIR) { |
1196 | if (remove_empty_directories(git_path("%s", newref))) { | |
1197 | error("Directory not empty: %s", newref); | |
1198 | goto rollback; | |
1199 | } | |
1200 | } else { | |
1201 | error("unable to delete existing %s", newref); | |
1202 | goto rollback; | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | if (log && safe_create_leading_directories(git_path("logs/%s", newref))) { | |
1207 | error("unable to create directory for %s", newref); | |
1208 | goto rollback; | |
1209 | } | |
1210 | ||
1211 | retry: | |
765c2258 | 1212 | if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newref))) { |
d9e74d57 JR |
1213 | if (errno==EISDIR || errno==ENOTDIR) { |
1214 | /* | |
1215 | * rename(a, b) when b is an existing | |
1216 | * directory ought to result in ISDIR, but | |
1217 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
1218 | */ | |
c976d415 LH |
1219 | if (remove_empty_directories(git_path("logs/%s", newref))) { |
1220 | error("Directory not empty: logs/%s", newref); | |
1221 | goto rollback; | |
1222 | } | |
1223 | goto retry; | |
1224 | } else { | |
765c2258 | 1225 | error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s", |
c976d415 LH |
1226 | newref, strerror(errno)); |
1227 | goto rollback; | |
1228 | } | |
1229 | } | |
1230 | logmoved = log; | |
1231 | ||
68db31cc | 1232 | lock = lock_ref_sha1_basic(newref, NULL, 0, NULL); |
c976d415 LH |
1233 | if (!lock) { |
1234 | error("unable to lock %s for update", newref); | |
1235 | goto rollback; | |
1236 | } | |
c976d415 LH |
1237 | lock->force_write = 1; |
1238 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 1239 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
c976d415 LH |
1240 | error("unable to write current sha1 into %s", newref); |
1241 | goto rollback; | |
1242 | } | |
1243 | ||
1244 | return 0; | |
1245 | ||
1246 | rollback: | |
68db31cc | 1247 | lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL); |
c976d415 LH |
1248 | if (!lock) { |
1249 | error("unable to lock %s for rollback", oldref); | |
1250 | goto rollbacklog; | |
1251 | } | |
1252 | ||
1253 | lock->force_write = 1; | |
1254 | flag = log_all_ref_updates; | |
1255 | log_all_ref_updates = 0; | |
1256 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
1257 | error("unable to write current sha1 into %s", oldref); | |
1258 | log_all_ref_updates = flag; | |
1259 | ||
1260 | rollbacklog: | |
1261 | if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref))) | |
1262 | error("unable to restore logfile %s from %s: %s", | |
1263 | oldref, newref, strerror(errno)); | |
1264 | if (!logmoved && log && | |
765c2258 PH |
1265 | rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldref))) |
1266 | error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s", | |
c976d415 LH |
1267 | oldref, strerror(errno)); |
1268 | ||
1269 | return 1; | |
1270 | } | |
1271 | ||
435fc852 | 1272 | int close_ref(struct ref_lock *lock) |
b531394d BC |
1273 | { |
1274 | if (close_lock_file(lock->lk)) | |
1275 | return -1; | |
1276 | lock->lock_fd = -1; | |
1277 | return 0; | |
1278 | } | |
1279 | ||
435fc852 | 1280 | int commit_ref(struct ref_lock *lock) |
b531394d BC |
1281 | { |
1282 | if (commit_lock_file(lock->lk)) | |
1283 | return -1; | |
1284 | lock->lock_fd = -1; | |
1285 | return 0; | |
1286 | } | |
1287 | ||
e5f38ec3 | 1288 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 | 1289 | { |
4ed7cd3a BC |
1290 | /* Do not free lock->lk -- atexit() still looks at them */ |
1291 | if (lock->lk) | |
1292 | rollback_lock_file(lock->lk); | |
434cd0cd | 1293 | free(lock->ref_name); |
1655707c | 1294 | free(lock->orig_ref_name); |
4bd18c43 SP |
1295 | free(lock); |
1296 | } | |
1297 | ||
0ec29a47 JH |
1298 | /* |
1299 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
1300 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
1301 | * because reflog file is one line per entry. | |
1302 | */ | |
1303 | static int copy_msg(char *buf, const char *msg) | |
1304 | { | |
1305 | char *cp = buf; | |
1306 | char c; | |
1307 | int wasspace = 1; | |
1308 | ||
1309 | *cp++ = '\t'; | |
1310 | while ((c = *msg++)) { | |
1311 | if (wasspace && isspace(c)) | |
1312 | continue; | |
1313 | wasspace = isspace(c); | |
1314 | if (wasspace) | |
1315 | c = ' '; | |
1316 | *cp++ = c; | |
1317 | } | |
1318 | while (buf < cp && isspace(cp[-1])) | |
1319 | cp--; | |
1320 | *cp++ = '\n'; | |
1321 | return cp - buf; | |
1322 | } | |
1323 | ||
157aaea5 | 1324 | int log_ref_setup(const char *ref_name, char *logfile, int bufsize) |
6de08ae6 | 1325 | { |
859c3017 | 1326 | int logfd, oflags = O_APPEND | O_WRONLY; |
9a13f0b7 | 1327 | |
157aaea5 | 1328 | git_snpath(logfile, bufsize, "logs/%s", ref_name); |
4057deb5 | 1329 | if (log_all_ref_updates && |
cc44c765 JH |
1330 | (!prefixcmp(ref_name, "refs/heads/") || |
1331 | !prefixcmp(ref_name, "refs/remotes/") || | |
b2e256b0 | 1332 | !prefixcmp(ref_name, "refs/notes/") || |
bd104db1 | 1333 | !strcmp(ref_name, "HEAD"))) { |
157aaea5 | 1334 | if (safe_create_leading_directories(logfile) < 0) |
6de08ae6 | 1335 | return error("unable to create directory for %s", |
157aaea5 | 1336 | logfile); |
6de08ae6 SP |
1337 | oflags |= O_CREAT; |
1338 | } | |
1339 | ||
157aaea5 | 1340 | logfd = open(logfile, oflags, 0666); |
6de08ae6 | 1341 | if (logfd < 0) { |
1974bf62 | 1342 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 1343 | return 0; |
3b463c3f JH |
1344 | |
1345 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
157aaea5 | 1346 | if (remove_empty_directories(logfile)) { |
3b463c3f | 1347 | return error("There are still logs under '%s'", |
157aaea5 | 1348 | logfile); |
3b463c3f | 1349 | } |
157aaea5 | 1350 | logfd = open(logfile, oflags, 0666); |
3b463c3f JH |
1351 | } |
1352 | ||
1353 | if (logfd < 0) | |
1354 | return error("Unable to append to %s: %s", | |
157aaea5 | 1355 | logfile, strerror(errno)); |
6de08ae6 SP |
1356 | } |
1357 | ||
157aaea5 | 1358 | adjust_shared_perm(logfile); |
859c3017 EM |
1359 | close(logfd); |
1360 | return 0; | |
1361 | } | |
443b92b6 | 1362 | |
859c3017 EM |
1363 | static int log_ref_write(const char *ref_name, const unsigned char *old_sha1, |
1364 | const unsigned char *new_sha1, const char *msg) | |
1365 | { | |
1366 | int logfd, result, written, oflags = O_APPEND | O_WRONLY; | |
1367 | unsigned maxlen, len; | |
1368 | int msglen; | |
157aaea5 | 1369 | char log_file[PATH_MAX]; |
859c3017 EM |
1370 | char *logrec; |
1371 | const char *committer; | |
1372 | ||
1373 | if (log_all_ref_updates < 0) | |
1374 | log_all_ref_updates = !is_bare_repository(); | |
1375 | ||
157aaea5 | 1376 | result = log_ref_setup(ref_name, log_file, sizeof(log_file)); |
859c3017 EM |
1377 | if (result) |
1378 | return result; | |
1379 | ||
1380 | logfd = open(log_file, oflags); | |
1381 | if (logfd < 0) | |
1382 | return 0; | |
0ec29a47 | 1383 | msglen = msg ? strlen(msg) : 0; |
774751a8 | 1384 | committer = git_committer_info(0); |
8ac65937 JH |
1385 | maxlen = strlen(committer) + msglen + 100; |
1386 | logrec = xmalloc(maxlen); | |
1387 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
1388 | sha1_to_hex(old_sha1), |
1389 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
1390 | committer); |
1391 | if (msglen) | |
0ec29a47 | 1392 | len += copy_msg(logrec + len - 1, msg) - 1; |
93822c22 | 1393 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 | 1394 | free(logrec); |
91c8d590 | 1395 | if (close(logfd) != 0 || written != len) |
9a13f0b7 | 1396 | return error("Unable to append to %s", log_file); |
6de08ae6 SP |
1397 | return 0; |
1398 | } | |
1399 | ||
c3b0dec5 LT |
1400 | static int is_branch(const char *refname) |
1401 | { | |
1402 | return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/"); | |
1403 | } | |
1404 | ||
4bd18c43 SP |
1405 | int write_ref_sha1(struct ref_lock *lock, |
1406 | const unsigned char *sha1, const char *logmsg) | |
1407 | { | |
1408 | static char term = '\n'; | |
c3b0dec5 | 1409 | struct object *o; |
4bd18c43 SP |
1410 | |
1411 | if (!lock) | |
95fc7512 | 1412 | return -1; |
a89fccd2 | 1413 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
1414 | unlock_ref(lock); |
1415 | return 0; | |
95fc7512 | 1416 | } |
c3b0dec5 LT |
1417 | o = parse_object(sha1); |
1418 | if (!o) { | |
1419 | error("Trying to write ref %s with nonexistant object %s", | |
1420 | lock->ref_name, sha1_to_hex(sha1)); | |
1421 | unlock_ref(lock); | |
1422 | return -1; | |
1423 | } | |
1424 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1425 | error("Trying to write non-commit object %s to branch %s", | |
1426 | sha1_to_hex(sha1), lock->ref_name); | |
1427 | unlock_ref(lock); | |
1428 | return -1; | |
1429 | } | |
93822c22 AW |
1430 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
1431 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
b531394d | 1432 | || close_ref(lock) < 0) { |
c33d5174 | 1433 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
1434 | unlock_ref(lock); |
1435 | return -1; | |
1436 | } | |
5e290ff7 | 1437 | invalidate_cached_refs(); |
bd104db1 NP |
1438 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
1439 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
1440 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
1441 | unlock_ref(lock); |
1442 | return -1; | |
1443 | } | |
605fac8b NP |
1444 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
1445 | /* | |
1446 | * Special hack: If a branch is updated directly and HEAD | |
1447 | * points to it (may happen on the remote side of a push | |
1448 | * for example) then logically the HEAD reflog should be | |
1449 | * updated too. | |
1450 | * A generic solution implies reverse symref information, | |
1451 | * but finding all symrefs pointing to the given branch | |
1452 | * would be rather costly for this rare event (the direct | |
1453 | * update of a branch) to be worth it. So let's cheat and | |
1454 | * check with HEAD only which should cover 99% of all usage | |
1455 | * scenarios (even 100% of the default ones). | |
1456 | */ | |
1457 | unsigned char head_sha1[20]; | |
1458 | int head_flag; | |
1459 | const char *head_ref; | |
1460 | head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag); | |
1461 | if (head_ref && (head_flag & REF_ISSYMREF) && | |
1462 | !strcmp(head_ref, lock->ref_name)) | |
1463 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
1464 | } | |
b531394d | 1465 | if (commit_ref(lock)) { |
434cd0cd | 1466 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
1467 | unlock_ref(lock); |
1468 | return -1; | |
1469 | } | |
4bd18c43 SP |
1470 | unlock_ref(lock); |
1471 | return 0; | |
95fc7512 | 1472 | } |
d556fae2 | 1473 | |
8b5157e4 NP |
1474 | int create_symref(const char *ref_target, const char *refs_heads_master, |
1475 | const char *logmsg) | |
41b625b0 NP |
1476 | { |
1477 | const char *lockpath; | |
1478 | char ref[1000]; | |
1479 | int fd, len, written; | |
a4f34cbb | 1480 | char *git_HEAD = git_pathdup("%s", ref_target); |
8b5157e4 NP |
1481 | unsigned char old_sha1[20], new_sha1[20]; |
1482 | ||
1483 | if (logmsg && read_ref(ref_target, old_sha1)) | |
1484 | hashclr(old_sha1); | |
41b625b0 | 1485 | |
d48744d1 JH |
1486 | if (safe_create_leading_directories(git_HEAD) < 0) |
1487 | return error("unable to create directory for %s", git_HEAD); | |
1488 | ||
41b625b0 NP |
1489 | #ifndef NO_SYMLINK_HEAD |
1490 | if (prefer_symlink_refs) { | |
1491 | unlink(git_HEAD); | |
1492 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 1493 | goto done; |
41b625b0 NP |
1494 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
1495 | } | |
1496 | #endif | |
1497 | ||
1498 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
1499 | if (sizeof(ref) <= len) { | |
1500 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 1501 | goto error_free_return; |
41b625b0 NP |
1502 | } |
1503 | lockpath = mkpath("%s.lock", git_HEAD); | |
1504 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
1505 | if (fd < 0) { | |
1506 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 1507 | goto error_free_return; |
41b625b0 NP |
1508 | } |
1509 | written = write_in_full(fd, ref, len); | |
91c8d590 | 1510 | if (close(fd) != 0 || written != len) { |
41b625b0 | 1511 | error("Unable to write to %s", lockpath); |
47fc52e2 | 1512 | goto error_unlink_return; |
41b625b0 NP |
1513 | } |
1514 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 1515 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 1516 | goto error_unlink_return; |
41b625b0 NP |
1517 | } |
1518 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 1519 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 | 1520 | error_unlink_return: |
691f1a28 | 1521 | unlink_or_warn(lockpath); |
47fc52e2 JH |
1522 | error_free_return: |
1523 | free(git_HEAD); | |
1524 | return -1; | |
41b625b0 | 1525 | } |
8b5157e4 | 1526 | |
ee96d11b | 1527 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 1528 | done: |
ee96d11b | 1529 | #endif |
8b5157e4 NP |
1530 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
1531 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
1532 | ||
47fc52e2 | 1533 | free(git_HEAD); |
41b625b0 NP |
1534 | return 0; |
1535 | } | |
1536 | ||
16d7cc90 JH |
1537 | static char *ref_msg(const char *line, const char *endp) |
1538 | { | |
1539 | const char *ep; | |
16d7cc90 | 1540 | line += 82; |
182af834 PH |
1541 | ep = memchr(line, '\n', endp - line); |
1542 | if (!ep) | |
1543 | ep = endp; | |
1544 | return xmemdupz(line, ep - line); | |
16d7cc90 JH |
1545 | } |
1546 | ||
1547 | int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *sha1, char **msg, unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt) | |
d556fae2 | 1548 | { |
e5229042 | 1549 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 | 1550 | char *tz_c; |
e29cb53a | 1551 | int logfd, tz, reccnt = 0; |
d556fae2 SP |
1552 | struct stat st; |
1553 | unsigned long date; | |
e5229042 | 1554 | unsigned char logged_sha1[20]; |
cb48cb58 | 1555 | void *log_mapped; |
dc49cd76 | 1556 | size_t mapsz; |
d556fae2 SP |
1557 | |
1558 | logfile = git_path("logs/%s", ref); | |
1559 | logfd = open(logfile, O_RDONLY, 0); | |
1560 | if (logfd < 0) | |
d824cbba | 1561 | die_errno("Unable to read log '%s'", logfile); |
d556fae2 SP |
1562 | fstat(logfd, &st); |
1563 | if (!st.st_size) | |
1564 | die("Log %s is empty.", logfile); | |
dc49cd76 SP |
1565 | mapsz = xsize_t(st.st_size); |
1566 | log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0); | |
cb48cb58 | 1567 | logdata = log_mapped; |
d556fae2 SP |
1568 | close(logfd); |
1569 | ||
e5229042 | 1570 | lastrec = NULL; |
d556fae2 SP |
1571 | rec = logend = logdata + st.st_size; |
1572 | while (logdata < rec) { | |
e29cb53a | 1573 | reccnt++; |
d556fae2 SP |
1574 | if (logdata < rec && *(rec-1) == '\n') |
1575 | rec--; | |
e5229042 SP |
1576 | lastgt = NULL; |
1577 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 1578 | rec--; |
e5229042 SP |
1579 | if (*rec == '>') |
1580 | lastgt = rec; | |
1581 | } | |
1582 | if (!lastgt) | |
d556fae2 | 1583 | die("Log %s is corrupt.", logfile); |
e5229042 | 1584 | date = strtoul(lastgt + 1, &tz_c, 10); |
ab2a1a32 | 1585 | if (date <= at_time || cnt == 0) { |
76a44c5c | 1586 | tz = strtoul(tz_c, NULL, 10); |
16d7cc90 JH |
1587 | if (msg) |
1588 | *msg = ref_msg(rec, logend); | |
1589 | if (cutoff_time) | |
1590 | *cutoff_time = date; | |
1591 | if (cutoff_tz) | |
1592 | *cutoff_tz = tz; | |
1593 | if (cutoff_cnt) | |
76a44c5c | 1594 | *cutoff_cnt = reccnt - 1; |
e5229042 SP |
1595 | if (lastrec) { |
1596 | if (get_sha1_hex(lastrec, logged_sha1)) | |
1597 | die("Log %s is corrupt.", logfile); | |
1598 | if (get_sha1_hex(rec + 41, sha1)) | |
1599 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1600 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1601 | warning("Log %s has gap after %s.", |
73013afd | 1602 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 | 1603 | } |
e5f38ec3 JH |
1604 | } |
1605 | else if (date == at_time) { | |
e5229042 SP |
1606 | if (get_sha1_hex(rec + 41, sha1)) |
1607 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
1608 | } |
1609 | else { | |
e5229042 SP |
1610 | if (get_sha1_hex(rec + 41, logged_sha1)) |
1611 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1612 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1613 | warning("Log %s unexpectedly ended on %s.", |
73013afd | 1614 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 SP |
1615 | } |
1616 | } | |
dc49cd76 | 1617 | munmap(log_mapped, mapsz); |
d556fae2 SP |
1618 | return 0; |
1619 | } | |
e5229042 | 1620 | lastrec = rec; |
ab2a1a32 JH |
1621 | if (cnt > 0) |
1622 | cnt--; | |
d556fae2 SP |
1623 | } |
1624 | ||
e5229042 SP |
1625 | rec = logdata; |
1626 | while (rec < logend && *rec != '>' && *rec != '\n') | |
1627 | rec++; | |
1628 | if (rec == logend || *rec == '\n') | |
d556fae2 | 1629 | die("Log %s is corrupt.", logfile); |
e5229042 | 1630 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
1631 | tz = strtoul(tz_c, NULL, 10); |
1632 | if (get_sha1_hex(logdata, sha1)) | |
1633 | die("Log %s is corrupt.", logfile); | |
d1a4489a JK |
1634 | if (is_null_sha1(sha1)) { |
1635 | if (get_sha1_hex(logdata + 41, sha1)) | |
1636 | die("Log %s is corrupt.", logfile); | |
1637 | } | |
16d7cc90 JH |
1638 | if (msg) |
1639 | *msg = ref_msg(logdata, logend); | |
dc49cd76 | 1640 | munmap(log_mapped, mapsz); |
16d7cc90 JH |
1641 | |
1642 | if (cutoff_time) | |
1643 | *cutoff_time = date; | |
1644 | if (cutoff_tz) | |
1645 | *cutoff_tz = tz; | |
1646 | if (cutoff_cnt) | |
1647 | *cutoff_cnt = reccnt; | |
1648 | return 1; | |
d556fae2 | 1649 | } |
2ff81662 | 1650 | |
101d15e0 | 1651 | int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long ofs, void *cb_data) |
2ff81662 JH |
1652 | { |
1653 | const char *logfile; | |
1654 | FILE *logfp; | |
8ca78803 | 1655 | struct strbuf sb = STRBUF_INIT; |
2266bf27 | 1656 | int ret = 0; |
2ff81662 JH |
1657 | |
1658 | logfile = git_path("logs/%s", ref); | |
1659 | logfp = fopen(logfile, "r"); | |
1660 | if (!logfp) | |
883d60fa | 1661 | return -1; |
101d15e0 JH |
1662 | |
1663 | if (ofs) { | |
1664 | struct stat statbuf; | |
1665 | if (fstat(fileno(logfp), &statbuf) || | |
1666 | statbuf.st_size < ofs || | |
1667 | fseek(logfp, -ofs, SEEK_END) || | |
8ca78803 | 1668 | strbuf_getwholeline(&sb, logfp, '\n')) { |
9d33f7c2 | 1669 | fclose(logfp); |
8ca78803 | 1670 | strbuf_release(&sb); |
101d15e0 | 1671 | return -1; |
9d33f7c2 | 1672 | } |
101d15e0 JH |
1673 | } |
1674 | ||
8ca78803 | 1675 | while (!strbuf_getwholeline(&sb, logfp, '\n')) { |
2ff81662 | 1676 | unsigned char osha1[20], nsha1[20]; |
883d60fa JS |
1677 | char *email_end, *message; |
1678 | unsigned long timestamp; | |
8ca78803 | 1679 | int tz; |
2ff81662 JH |
1680 | |
1681 | /* old SP new SP name <email> SP time TAB msg LF */ | |
8ca78803 RS |
1682 | if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' || |
1683 | get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' || | |
1684 | get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' || | |
1685 | !(email_end = strchr(sb.buf + 82, '>')) || | |
883d60fa JS |
1686 | email_end[1] != ' ' || |
1687 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
1688 | !message || message[0] != ' ' || | |
1689 | (message[1] != '+' && message[1] != '-') || | |
1690 | !isdigit(message[2]) || !isdigit(message[3]) || | |
b4dd4856 | 1691 | !isdigit(message[4]) || !isdigit(message[5])) |
2ff81662 | 1692 | continue; /* corrupt? */ |
883d60fa JS |
1693 | email_end[1] = '\0'; |
1694 | tz = strtol(message + 1, NULL, 10); | |
b4dd4856 JS |
1695 | if (message[6] != '\t') |
1696 | message += 6; | |
1697 | else | |
1698 | message += 7; | |
8ca78803 RS |
1699 | ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message, |
1700 | cb_data); | |
883d60fa | 1701 | if (ret) |
2266bf27 | 1702 | break; |
2ff81662 JH |
1703 | } |
1704 | fclose(logfp); | |
8ca78803 | 1705 | strbuf_release(&sb); |
2266bf27 | 1706 | return ret; |
2ff81662 | 1707 | } |
e29cb53a | 1708 | |
101d15e0 JH |
1709 | int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data) |
1710 | { | |
1711 | return for_each_recent_reflog_ent(ref, fn, 0, cb_data); | |
1712 | } | |
1713 | ||
eb8381c8 NP |
1714 | static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data) |
1715 | { | |
1716 | DIR *dir = opendir(git_path("logs/%s", base)); | |
fcee5a14 | 1717 | int retval = 0; |
eb8381c8 NP |
1718 | |
1719 | if (dir) { | |
1720 | struct dirent *de; | |
1721 | int baselen = strlen(base); | |
1722 | char *log = xmalloc(baselen + 257); | |
1723 | ||
1724 | memcpy(log, base, baselen); | |
1725 | if (baselen && base[baselen-1] != '/') | |
1726 | log[baselen++] = '/'; | |
1727 | ||
1728 | while ((de = readdir(dir)) != NULL) { | |
1729 | struct stat st; | |
1730 | int namelen; | |
1731 | ||
1732 | if (de->d_name[0] == '.') | |
1733 | continue; | |
1734 | namelen = strlen(de->d_name); | |
1735 | if (namelen > 255) | |
1736 | continue; | |
1737 | if (has_extension(de->d_name, ".lock")) | |
1738 | continue; | |
1739 | memcpy(log + baselen, de->d_name, namelen+1); | |
1740 | if (stat(git_path("logs/%s", log), &st) < 0) | |
1741 | continue; | |
1742 | if (S_ISDIR(st.st_mode)) { | |
1743 | retval = do_for_each_reflog(log, fn, cb_data); | |
1744 | } else { | |
1745 | unsigned char sha1[20]; | |
1746 | if (!resolve_ref(log, sha1, 0, NULL)) | |
1747 | retval = error("bad ref for %s", log); | |
1748 | else | |
1749 | retval = fn(log, sha1, 0, cb_data); | |
1750 | } | |
1751 | if (retval) | |
1752 | break; | |
1753 | } | |
1754 | free(log); | |
1755 | closedir(dir); | |
1756 | } | |
acb39f64 | 1757 | else if (*base) |
fcee5a14 | 1758 | return errno; |
eb8381c8 NP |
1759 | return retval; |
1760 | } | |
1761 | ||
1762 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
1763 | { | |
1764 | return do_for_each_reflog("", fn, cb_data); | |
1765 | } | |
3d9f037c CR |
1766 | |
1767 | int update_ref(const char *action, const char *refname, | |
1768 | const unsigned char *sha1, const unsigned char *oldval, | |
1769 | int flags, enum action_on_err onerr) | |
1770 | { | |
1771 | static struct ref_lock *lock; | |
1772 | lock = lock_any_ref_for_update(refname, oldval, flags); | |
1773 | if (!lock) { | |
1774 | const char *str = "Cannot lock the ref '%s'."; | |
1775 | switch (onerr) { | |
1776 | case MSG_ON_ERR: error(str, refname); break; | |
1777 | case DIE_ON_ERR: die(str, refname); break; | |
1778 | case QUIET_ON_ERR: break; | |
1779 | } | |
1780 | return 1; | |
1781 | } | |
1782 | if (write_ref_sha1(lock, sha1, action) < 0) { | |
1783 | const char *str = "Cannot update the ref '%s'."; | |
1784 | switch (onerr) { | |
1785 | case MSG_ON_ERR: error(str, refname); break; | |
1786 | case DIE_ON_ERR: die(str, refname); break; | |
1787 | case QUIET_ON_ERR: break; | |
1788 | } | |
1789 | return 1; | |
1790 | } | |
1791 | return 0; | |
1792 | } | |
cda69f48 | 1793 | |
5483f799 | 1794 | struct ref *find_ref_by_name(const struct ref *list, const char *name) |
cda69f48 JK |
1795 | { |
1796 | for ( ; list; list = list->next) | |
1797 | if (!strcmp(list->name, name)) | |
5483f799 | 1798 | return (struct ref *)list; |
cda69f48 JK |
1799 | return NULL; |
1800 | } | |
7c2b3029 JK |
1801 | |
1802 | /* | |
1803 | * generate a format suitable for scanf from a ref_rev_parse_rules | |
1804 | * rule, that is replace the "%.*s" spec with a "%s" spec | |
1805 | */ | |
1806 | static void gen_scanf_fmt(char *scanf_fmt, const char *rule) | |
1807 | { | |
1808 | char *spec; | |
1809 | ||
1810 | spec = strstr(rule, "%.*s"); | |
1811 | if (!spec || strstr(spec + 4, "%.*s")) | |
1812 | die("invalid rule in ref_rev_parse_rules: %s", rule); | |
1813 | ||
1814 | /* copy all until spec */ | |
1815 | strncpy(scanf_fmt, rule, spec - rule); | |
1816 | scanf_fmt[spec - rule] = '\0'; | |
1817 | /* copy new spec */ | |
1818 | strcat(scanf_fmt, "%s"); | |
1819 | /* copy remaining rule */ | |
1820 | strcat(scanf_fmt, spec + 4); | |
1821 | ||
1822 | return; | |
1823 | } | |
1824 | ||
6e7b3309 | 1825 | char *shorten_unambiguous_ref(const char *ref, int strict) |
7c2b3029 JK |
1826 | { |
1827 | int i; | |
1828 | static char **scanf_fmts; | |
1829 | static int nr_rules; | |
1830 | char *short_name; | |
1831 | ||
1832 | /* pre generate scanf formats from ref_rev_parse_rules[] */ | |
1833 | if (!nr_rules) { | |
1834 | size_t total_len = 0; | |
1835 | ||
1836 | /* the rule list is NULL terminated, count them first */ | |
1837 | for (; ref_rev_parse_rules[nr_rules]; nr_rules++) | |
1838 | /* no +1 because strlen("%s") < strlen("%.*s") */ | |
1839 | total_len += strlen(ref_rev_parse_rules[nr_rules]); | |
1840 | ||
1841 | scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len); | |
1842 | ||
1843 | total_len = 0; | |
1844 | for (i = 0; i < nr_rules; i++) { | |
1845 | scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] | |
1846 | + total_len; | |
1847 | gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]); | |
1848 | total_len += strlen(ref_rev_parse_rules[i]); | |
1849 | } | |
1850 | } | |
1851 | ||
1852 | /* bail out if there are no rules */ | |
1853 | if (!nr_rules) | |
1854 | return xstrdup(ref); | |
1855 | ||
1856 | /* buffer for scanf result, at most ref must fit */ | |
1857 | short_name = xstrdup(ref); | |
1858 | ||
1859 | /* skip first rule, it will always match */ | |
1860 | for (i = nr_rules - 1; i > 0 ; --i) { | |
1861 | int j; | |
6e7b3309 | 1862 | int rules_to_fail = i; |
7c2b3029 JK |
1863 | int short_name_len; |
1864 | ||
1865 | if (1 != sscanf(ref, scanf_fmts[i], short_name)) | |
1866 | continue; | |
1867 | ||
1868 | short_name_len = strlen(short_name); | |
1869 | ||
6e7b3309 BW |
1870 | /* |
1871 | * in strict mode, all (except the matched one) rules | |
1872 | * must fail to resolve to a valid non-ambiguous ref | |
1873 | */ | |
1874 | if (strict) | |
1875 | rules_to_fail = nr_rules; | |
1876 | ||
7c2b3029 JK |
1877 | /* |
1878 | * check if the short name resolves to a valid ref, | |
1879 | * but use only rules prior to the matched one | |
1880 | */ | |
6e7b3309 | 1881 | for (j = 0; j < rules_to_fail; j++) { |
7c2b3029 JK |
1882 | const char *rule = ref_rev_parse_rules[j]; |
1883 | unsigned char short_objectname[20]; | |
1884 | char refname[PATH_MAX]; | |
1885 | ||
6e7b3309 BW |
1886 | /* skip matched rule */ |
1887 | if (i == j) | |
1888 | continue; | |
1889 | ||
7c2b3029 JK |
1890 | /* |
1891 | * the short name is ambiguous, if it resolves | |
1892 | * (with this previous rule) to a valid ref | |
1893 | * read_ref() returns 0 on success | |
1894 | */ | |
1895 | mksnpath(refname, sizeof(refname), | |
1896 | rule, short_name_len, short_name); | |
1897 | if (!read_ref(refname, short_objectname)) | |
1898 | break; | |
1899 | } | |
1900 | ||
1901 | /* | |
1902 | * short name is non-ambiguous if all previous rules | |
1903 | * haven't resolved to a valid ref | |
1904 | */ | |
6e7b3309 | 1905 | if (j == rules_to_fail) |
7c2b3029 JK |
1906 | return short_name; |
1907 | } | |
1908 | ||
1909 | free(short_name); | |
1910 | return xstrdup(ref); | |
1911 | } |