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Commit | Line | Data |
---|---|---|
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); |
dce4bab6 MH |
63 | if (check_refname_format(name, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT)) |
64 | die("Reference has invalid format: '%s'", name); | |
e1e22e37 | 65 | memcpy(entry->name, name, len); |
8da19775 | 66 | entry->flag = flag; |
f4204ab9 JH |
67 | if (new_entry) |
68 | *new_entry = entry; | |
e9c4c111 JP |
69 | ALLOC_GROW(refs->refs, refs->nr + 1, refs->alloc); |
70 | refs->refs[refs->nr++] = entry; | |
c774aab9 JP |
71 | } |
72 | ||
e9c4c111 | 73 | static int ref_entry_cmp(const void *a, const void *b) |
c774aab9 | 74 | { |
e9c4c111 JP |
75 | struct ref_entry *one = *(struct ref_entry **)a; |
76 | struct ref_entry *two = *(struct ref_entry **)b; | |
77 | return strcmp(one->name, two->name); | |
78 | } | |
c774aab9 | 79 | |
e9c4c111 JP |
80 | static void sort_ref_array(struct ref_array *array) |
81 | { | |
82 | int i = 0, j = 1; | |
c774aab9 | 83 | |
e9c4c111 JP |
84 | /* Nothing to sort unless there are at least two entries */ |
85 | if (array->nr < 2) | |
86 | return; | |
c774aab9 | 87 | |
e9c4c111 | 88 | qsort(array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp); |
c774aab9 | 89 | |
e9c4c111 JP |
90 | /* Remove any duplicates from the ref_array */ |
91 | for (; j < array->nr; j++) { | |
92 | struct ref_entry *a = array->refs[i]; | |
93 | struct ref_entry *b = array->refs[j]; | |
94 | if (!strcmp(a->name, b->name)) { | |
95 | if (hashcmp(a->sha1, b->sha1)) | |
96 | die("Duplicated ref, and SHA1s don't match: %s", | |
97 | a->name); | |
98 | warning("Duplicated ref: %s", a->name); | |
17d68a54 | 99 | free(b); |
e9c4c111 JP |
100 | continue; |
101 | } | |
102 | i++; | |
103 | array->refs[i] = array->refs[j]; | |
104 | } | |
105 | array->nr = i + 1; | |
106 | } | |
c774aab9 | 107 | |
e9c4c111 JP |
108 | static struct ref_entry *search_ref_array(struct ref_array *array, const char *name) |
109 | { | |
110 | struct ref_entry *e, **r; | |
111 | int len; | |
c774aab9 | 112 | |
e9c4c111 JP |
113 | if (name == NULL) |
114 | return NULL; | |
c774aab9 | 115 | |
68729696 BC |
116 | if (!array->nr) |
117 | return NULL; | |
c774aab9 | 118 | |
e9c4c111 JP |
119 | len = strlen(name) + 1; |
120 | e = xmalloc(sizeof(struct ref_entry) + len); | |
121 | memcpy(e->name, name, len); | |
c774aab9 | 122 | |
e9c4c111 | 123 | r = bsearch(&e, array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp); |
c774aab9 | 124 | |
e9c4c111 | 125 | free(e); |
c774aab9 | 126 | |
e9c4c111 JP |
127 | if (r == NULL) |
128 | return NULL; | |
c774aab9 | 129 | |
e9c4c111 | 130 | return *r; |
e1e22e37 LT |
131 | } |
132 | ||
5e290ff7 JH |
133 | /* |
134 | * Future: need to be in "struct repository" | |
135 | * when doing a full libification. | |
136 | */ | |
79c7ca54 MH |
137 | static struct ref_cache { |
138 | struct ref_cache *next; | |
5e290ff7 JH |
139 | char did_loose; |
140 | char did_packed; | |
e9c4c111 JP |
141 | struct ref_array loose; |
142 | struct ref_array packed; | |
ce40979c MH |
143 | /* The submodule name, or "" for the main repo. */ |
144 | char name[FLEX_ARRAY]; | |
79c7ca54 | 145 | } *ref_cache; |
0e88c130 | 146 | |
e9c4c111 | 147 | static struct ref_entry *current_ref; |
5e290ff7 | 148 | |
e9c4c111 | 149 | static struct ref_array extra_refs; |
e142a3c6 | 150 | |
e9c4c111 | 151 | static void free_ref_array(struct ref_array *array) |
5e290ff7 | 152 | { |
e9c4c111 JP |
153 | int i; |
154 | for (i = 0; i < array->nr; i++) | |
155 | free(array->refs[i]); | |
156 | free(array->refs); | |
157 | array->nr = array->alloc = 0; | |
158 | array->refs = NULL; | |
5e290ff7 JH |
159 | } |
160 | ||
79c7ca54 | 161 | static void clear_ref_cache(struct ref_cache *ca) |
e1e22e37 | 162 | { |
e9c4c111 JP |
163 | if (ca->did_loose) |
164 | free_ref_array(&ca->loose); | |
165 | if (ca->did_packed) | |
166 | free_ref_array(&ca->packed); | |
5e290ff7 JH |
167 | ca->did_loose = ca->did_packed = 0; |
168 | } | |
e1e22e37 | 169 | |
79c7ca54 | 170 | static struct ref_cache *create_ref_cache(const char *submodule) |
e5dbf605 | 171 | { |
ce40979c | 172 | int len; |
79c7ca54 | 173 | struct ref_cache *refs; |
ce40979c MH |
174 | if (!submodule) |
175 | submodule = ""; | |
176 | len = strlen(submodule) + 1; | |
79c7ca54 | 177 | refs = xcalloc(1, sizeof(struct ref_cache) + len); |
ce40979c | 178 | memcpy(refs->name, submodule, len); |
e5dbf605 MH |
179 | return refs; |
180 | } | |
181 | ||
4349a668 | 182 | /* |
79c7ca54 | 183 | * Return a pointer to a ref_cache for the specified submodule. For |
4349a668 MH |
184 | * the main repository, use submodule==NULL. The returned structure |
185 | * will be allocated and initialized but not necessarily populated; it | |
186 | * should not be freed. | |
187 | */ | |
79c7ca54 | 188 | static struct ref_cache *get_ref_cache(const char *submodule) |
4349a668 | 189 | { |
79c7ca54 | 190 | struct ref_cache *refs = ref_cache; |
0e88c130 MH |
191 | if (!submodule) |
192 | submodule = ""; | |
193 | while (refs) { | |
194 | if (!strcmp(submodule, refs->name)) | |
195 | return refs; | |
196 | refs = refs->next; | |
4349a668 | 197 | } |
0e88c130 | 198 | |
79c7ca54 MH |
199 | refs = create_ref_cache(submodule); |
200 | refs->next = ref_cache; | |
201 | ref_cache = refs; | |
0e88c130 | 202 | return refs; |
4349a668 MH |
203 | } |
204 | ||
79c7ca54 | 205 | static void invalidate_ref_cache(void) |
f130b116 | 206 | { |
79c7ca54 | 207 | struct ref_cache *refs = ref_cache; |
0e88c130 | 208 | while (refs) { |
79c7ca54 | 209 | clear_ref_cache(refs); |
0e88c130 MH |
210 | refs = refs->next; |
211 | } | |
5e290ff7 | 212 | } |
e1e22e37 | 213 | |
2c5c66be | 214 | static void read_packed_refs(FILE *f, struct ref_array *array) |
f4204ab9 | 215 | { |
e9c4c111 | 216 | struct ref_entry *last = NULL; |
f4204ab9 JH |
217 | char refline[PATH_MAX]; |
218 | int flag = REF_ISPACKED; | |
219 | ||
220 | while (fgets(refline, sizeof(refline), f)) { | |
221 | unsigned char sha1[20]; | |
222 | const char *name; | |
223 | static const char header[] = "# pack-refs with:"; | |
224 | ||
225 | if (!strncmp(refline, header, sizeof(header)-1)) { | |
226 | const char *traits = refline + sizeof(header) - 1; | |
227 | if (strstr(traits, " peeled ")) | |
228 | flag |= REF_KNOWS_PEELED; | |
229 | /* perhaps other traits later as well */ | |
230 | continue; | |
231 | } | |
232 | ||
233 | name = parse_ref_line(refline, sha1); | |
234 | if (name) { | |
2c5c66be | 235 | add_ref(name, sha1, flag, array, &last); |
f4204ab9 JH |
236 | continue; |
237 | } | |
238 | if (last && | |
239 | refline[0] == '^' && | |
240 | strlen(refline) == 42 && | |
241 | refline[41] == '\n' && | |
242 | !get_sha1_hex(refline + 1, sha1)) | |
243 | hashcpy(last->peeled, sha1); | |
244 | } | |
2c5c66be | 245 | sort_ref_array(array); |
f4204ab9 JH |
246 | } |
247 | ||
e142a3c6 DB |
248 | void add_extra_ref(const char *name, const unsigned char *sha1, int flag) |
249 | { | |
e9c4c111 | 250 | add_ref(name, sha1, flag, &extra_refs, NULL); |
e142a3c6 DB |
251 | } |
252 | ||
253 | void clear_extra_refs(void) | |
254 | { | |
e9c4c111 | 255 | free_ref_array(&extra_refs); |
e142a3c6 DB |
256 | } |
257 | ||
e9c4c111 | 258 | static struct ref_array *get_packed_refs(const char *submodule) |
5e290ff7 | 259 | { |
79c7ca54 | 260 | struct ref_cache *refs = get_ref_cache(submodule); |
0bad611b | 261 | |
4349a668 MH |
262 | if (!refs->did_packed) { |
263 | const char *packed_refs_file; | |
264 | FILE *f; | |
0bad611b | 265 | |
4349a668 MH |
266 | if (submodule) |
267 | packed_refs_file = git_path_submodule(submodule, "packed-refs"); | |
268 | else | |
269 | packed_refs_file = git_path("packed-refs"); | |
270 | f = fopen(packed_refs_file, "r"); | |
e1e22e37 | 271 | if (f) { |
2c5c66be | 272 | read_packed_refs(f, &refs->packed); |
e1e22e37 | 273 | fclose(f); |
e1e22e37 | 274 | } |
0bad611b | 275 | refs->did_packed = 1; |
e1e22e37 | 276 | } |
e9c4c111 | 277 | return &refs->packed; |
e1e22e37 LT |
278 | } |
279 | ||
e9c4c111 JP |
280 | static void get_ref_dir(const char *submodule, const char *base, |
281 | struct ref_array *array) | |
e1e22e37 | 282 | { |
0bad611b HV |
283 | DIR *dir; |
284 | const char *path; | |
285 | ||
286 | if (submodule) | |
287 | path = git_path_submodule(submodule, "%s", base); | |
288 | else | |
289 | path = git_path("%s", base); | |
290 | ||
291 | ||
292 | dir = opendir(path); | |
e1e22e37 LT |
293 | |
294 | if (dir) { | |
295 | struct dirent *de; | |
296 | int baselen = strlen(base); | |
ed378ec7 | 297 | char *ref = xmalloc(baselen + 257); |
e1e22e37 | 298 | |
ed378ec7 | 299 | memcpy(ref, base, baselen); |
e1e22e37 | 300 | if (baselen && base[baselen-1] != '/') |
ed378ec7 | 301 | ref[baselen++] = '/'; |
e1e22e37 LT |
302 | |
303 | while ((de = readdir(dir)) != NULL) { | |
304 | unsigned char sha1[20]; | |
305 | struct stat st; | |
8da19775 | 306 | int flag; |
e1e22e37 | 307 | int namelen; |
0bad611b | 308 | const char *refdir; |
e1e22e37 LT |
309 | |
310 | if (de->d_name[0] == '.') | |
311 | continue; | |
312 | namelen = strlen(de->d_name); | |
313 | if (namelen > 255) | |
314 | continue; | |
315 | if (has_extension(de->d_name, ".lock")) | |
316 | continue; | |
ed378ec7 | 317 | memcpy(ref + baselen, de->d_name, namelen+1); |
0bad611b HV |
318 | refdir = submodule |
319 | ? git_path_submodule(submodule, "%s", ref) | |
320 | : git_path("%s", ref); | |
321 | if (stat(refdir, &st) < 0) | |
e1e22e37 LT |
322 | continue; |
323 | if (S_ISDIR(st.st_mode)) { | |
e9c4c111 | 324 | get_ref_dir(submodule, ref, array); |
e1e22e37 LT |
325 | continue; |
326 | } | |
0bad611b | 327 | if (submodule) { |
f8948e2f | 328 | hashclr(sha1); |
0bad611b HV |
329 | flag = 0; |
330 | if (resolve_gitlink_ref(submodule, ref, sha1) < 0) { | |
331 | hashclr(sha1); | |
332 | flag |= REF_BROKEN; | |
333 | } | |
334 | } else | |
335 | if (!resolve_ref(ref, sha1, 1, &flag)) { | |
336 | hashclr(sha1); | |
337 | flag |= REF_BROKEN; | |
338 | } | |
e9c4c111 | 339 | add_ref(ref, sha1, flag, array, NULL); |
e1e22e37 | 340 | } |
ed378ec7 | 341 | free(ref); |
e1e22e37 LT |
342 | closedir(dir); |
343 | } | |
e1e22e37 LT |
344 | } |
345 | ||
f8948e2f | 346 | struct warn_if_dangling_data { |
3cf6134a | 347 | FILE *fp; |
f8948e2f JH |
348 | const char *refname; |
349 | const char *msg_fmt; | |
350 | }; | |
351 | ||
352 | static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1, | |
353 | int flags, void *cb_data) | |
354 | { | |
355 | struct warn_if_dangling_data *d = cb_data; | |
356 | const char *resolves_to; | |
357 | unsigned char junk[20]; | |
358 | ||
359 | if (!(flags & REF_ISSYMREF)) | |
360 | return 0; | |
361 | ||
362 | resolves_to = resolve_ref(refname, junk, 0, NULL); | |
363 | if (!resolves_to || strcmp(resolves_to, d->refname)) | |
364 | return 0; | |
365 | ||
3cf6134a | 366 | fprintf(d->fp, d->msg_fmt, refname); |
f8948e2f JH |
367 | return 0; |
368 | } | |
369 | ||
3cf6134a | 370 | void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname) |
f8948e2f | 371 | { |
66dbfd55 GV |
372 | struct warn_if_dangling_data data; |
373 | ||
374 | data.fp = fp; | |
375 | data.refname = refname; | |
376 | data.msg_fmt = msg_fmt; | |
f8948e2f JH |
377 | for_each_rawref(warn_if_dangling_symref, &data); |
378 | } | |
379 | ||
e9c4c111 | 380 | static struct ref_array *get_loose_refs(const char *submodule) |
e1e22e37 | 381 | { |
79c7ca54 | 382 | struct ref_cache *refs = get_ref_cache(submodule); |
0bad611b | 383 | |
4349a668 | 384 | if (!refs->did_loose) { |
2c5c66be JH |
385 | get_ref_dir(submodule, "refs", &refs->loose); |
386 | sort_ref_array(&refs->loose); | |
4349a668 | 387 | refs->did_loose = 1; |
e1e22e37 | 388 | } |
2c5c66be | 389 | return &refs->loose; |
e1e22e37 LT |
390 | } |
391 | ||
ca8db142 LT |
392 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
393 | #define MAXDEPTH 5 | |
0ebde32c LT |
394 | #define MAXREFLEN (1024) |
395 | ||
396 | static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result) | |
397 | { | |
e9c4c111 | 398 | int retval = -1; |
2c5c66be JH |
399 | struct ref_entry *ref; |
400 | struct ref_array *array = get_packed_refs(name); | |
0ebde32c | 401 | |
2c5c66be | 402 | ref = search_ref_array(array, refname); |
e9c4c111 JP |
403 | if (ref != NULL) { |
404 | memcpy(result, ref->sha1, 20); | |
405 | retval = 0; | |
0ebde32c | 406 | } |
0ebde32c LT |
407 | return retval; |
408 | } | |
409 | ||
410 | static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion) | |
411 | { | |
412 | int fd, len = strlen(refname); | |
413 | char buffer[128], *p; | |
414 | ||
415 | if (recursion > MAXDEPTH || len > MAXREFLEN) | |
416 | return -1; | |
417 | memcpy(name + pathlen, refname, len+1); | |
418 | fd = open(name, O_RDONLY); | |
419 | if (fd < 0) | |
420 | return resolve_gitlink_packed_ref(name, pathlen, refname, result); | |
421 | ||
422 | len = read(fd, buffer, sizeof(buffer)-1); | |
423 | close(fd); | |
424 | if (len < 0) | |
425 | return -1; | |
426 | while (len && isspace(buffer[len-1])) | |
427 | len--; | |
428 | buffer[len] = 0; | |
429 | ||
430 | /* Was it a detached head or an old-fashioned symlink? */ | |
431 | if (!get_sha1_hex(buffer, result)) | |
432 | return 0; | |
433 | ||
434 | /* Symref? */ | |
435 | if (strncmp(buffer, "ref:", 4)) | |
436 | return -1; | |
437 | p = buffer + 4; | |
438 | while (isspace(*p)) | |
439 | p++; | |
440 | ||
441 | return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1); | |
442 | } | |
443 | ||
444 | int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result) | |
445 | { | |
446 | int len = strlen(path), retval; | |
447 | char *gitdir; | |
842abf06 | 448 | const char *tmp; |
0ebde32c LT |
449 | |
450 | while (len && path[len-1] == '/') | |
451 | len--; | |
452 | if (!len) | |
453 | return -1; | |
454 | gitdir = xmalloc(len + MAXREFLEN + 8); | |
455 | memcpy(gitdir, path, len); | |
842abf06 LH |
456 | memcpy(gitdir + len, "/.git", 6); |
457 | len += 5; | |
458 | ||
13d6ec91 | 459 | tmp = read_gitfile(gitdir); |
842abf06 LH |
460 | if (tmp) { |
461 | free(gitdir); | |
462 | len = strlen(tmp); | |
463 | gitdir = xmalloc(len + MAXREFLEN + 3); | |
464 | memcpy(gitdir, tmp, len); | |
465 | } | |
466 | gitdir[len] = '/'; | |
467 | gitdir[++len] = '\0'; | |
468 | retval = resolve_gitlink_ref_recursive(gitdir, len, refname, result, 0); | |
0ebde32c LT |
469 | free(gitdir); |
470 | return retval; | |
471 | } | |
ca8db142 | 472 | |
4886b89f | 473 | /* |
c224ca7f MH |
474 | * Try to read ref from the packed references. On success, set sha1 |
475 | * and return 0; otherwise, return -1. | |
4886b89f | 476 | */ |
c224ca7f MH |
477 | static int get_packed_ref(const char *ref, unsigned char *sha1) |
478 | { | |
2c5c66be JH |
479 | struct ref_array *packed = get_packed_refs(NULL); |
480 | struct ref_entry *entry = search_ref_array(packed, ref); | |
481 | if (entry) { | |
482 | hashcpy(sha1, entry->sha1); | |
483 | return 0; | |
c224ca7f MH |
484 | } |
485 | return -1; | |
486 | } | |
487 | ||
8da19775 | 488 | const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 489 | { |
0104ca09 HO |
490 | int depth = MAXDEPTH; |
491 | ssize_t len; | |
a876ed83 | 492 | char buffer[256]; |
ed378ec7 | 493 | static char ref_buffer[256]; |
629cd3ac | 494 | char path[PATH_MAX]; |
ca8db142 | 495 | |
8da19775 JH |
496 | if (flag) |
497 | *flag = 0; | |
498 | ||
8384d788 MH |
499 | if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL)) |
500 | return NULL; | |
501 | ||
a876ed83 JH |
502 | for (;;) { |
503 | struct stat st; | |
504 | char *buf; | |
505 | int fd; | |
8a65ff76 | 506 | |
a876ed83 JH |
507 | if (--depth < 0) |
508 | return NULL; | |
ca8db142 | 509 | |
958a4789 | 510 | git_snpath(path, sizeof(path), "%s", ref); |
c224ca7f | 511 | |
a876ed83 | 512 | if (lstat(path, &st) < 0) { |
c224ca7f MH |
513 | if (errno != ENOENT) |
514 | return NULL; | |
515 | /* | |
516 | * The loose reference file does not exist; | |
517 | * check for a packed reference. | |
518 | */ | |
519 | if (!get_packed_ref(ref, sha1)) { | |
520 | if (flag) | |
521 | *flag |= REF_ISPACKED; | |
522 | return ref; | |
434cd0cd | 523 | } |
c224ca7f MH |
524 | /* The reference is not a packed reference, either. */ |
525 | if (reading) { | |
a876ed83 | 526 | return NULL; |
c224ca7f MH |
527 | } else { |
528 | hashclr(sha1); | |
529 | return ref; | |
530 | } | |
a876ed83 | 531 | } |
ca8db142 | 532 | |
a876ed83 JH |
533 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
534 | if (S_ISLNK(st.st_mode)) { | |
535 | len = readlink(path, buffer, sizeof(buffer)-1); | |
7bb2bf8e MH |
536 | if (len < 0) |
537 | return NULL; | |
b54cb795 | 538 | buffer[len] = 0; |
1f58a038 MH |
539 | if (!prefixcmp(buffer, "refs/") && |
540 | !check_refname_format(buffer, 0)) { | |
ed378ec7 LT |
541 | strcpy(ref_buffer, buffer); |
542 | ref = ref_buffer; | |
8da19775 JH |
543 | if (flag) |
544 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
545 | continue; |
546 | } | |
ca8db142 | 547 | } |
a876ed83 | 548 | |
7a21632f DS |
549 | /* Is it a directory? */ |
550 | if (S_ISDIR(st.st_mode)) { | |
551 | errno = EISDIR; | |
552 | return NULL; | |
553 | } | |
554 | ||
a876ed83 JH |
555 | /* |
556 | * Anything else, just open it and try to use it as | |
557 | * a ref | |
558 | */ | |
559 | fd = open(path, O_RDONLY); | |
560 | if (fd < 0) | |
561 | return NULL; | |
93d26e4c | 562 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
a876ed83 | 563 | close(fd); |
28775050 MH |
564 | if (len < 0) |
565 | return NULL; | |
566 | while (len && isspace(buffer[len-1])) | |
567 | len--; | |
568 | buffer[len] = '\0'; | |
a876ed83 JH |
569 | |
570 | /* | |
571 | * Is it a symbolic ref? | |
572 | */ | |
28775050 | 573 | if (prefixcmp(buffer, "ref:")) |
a876ed83 JH |
574 | break; |
575 | buf = buffer + 4; | |
28775050 MH |
576 | while (isspace(*buf)) |
577 | buf++; | |
313fb010 MH |
578 | if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) { |
579 | warning("symbolic reference in %s is formatted incorrectly", | |
580 | path); | |
581 | return NULL; | |
582 | } | |
28775050 | 583 | ref = strcpy(ref_buffer, buf); |
8da19775 JH |
584 | if (flag) |
585 | *flag |= REF_ISSYMREF; | |
8a65ff76 | 586 | } |
f989fea0 MH |
587 | /* Please note that FETCH_HEAD has a second line containing other data. */ |
588 | if (get_sha1_hex(buffer, sha1) || (buffer[40] != '\0' && !isspace(buffer[40]))) { | |
629cd3ac | 589 | warning("reference in %s is formatted incorrectly", path); |
a876ed83 | 590 | return NULL; |
629cd3ac | 591 | } |
ed378ec7 | 592 | return ref; |
a876ed83 JH |
593 | } |
594 | ||
d08bae7e IL |
595 | /* The argument to filter_refs */ |
596 | struct ref_filter { | |
597 | const char *pattern; | |
598 | each_ref_fn *fn; | |
599 | void *cb_data; | |
600 | }; | |
601 | ||
ed378ec7 | 602 | int read_ref(const char *ref, unsigned char *sha1) |
a876ed83 | 603 | { |
8da19775 | 604 | if (resolve_ref(ref, sha1, 1, NULL)) |
a876ed83 JH |
605 | return 0; |
606 | return -1; | |
8a65ff76 LT |
607 | } |
608 | ||
f8948e2f | 609 | #define DO_FOR_EACH_INCLUDE_BROKEN 01 |
ef06b918 | 610 | static int do_one_ref(const char *base, each_ref_fn fn, int trim, |
e9c4c111 | 611 | int flags, void *cb_data, struct ref_entry *entry) |
ef06b918 | 612 | { |
b3cfc406 | 613 | if (prefixcmp(entry->name, base)) |
ef06b918 | 614 | return 0; |
e01de1c9 | 615 | |
f8948e2f | 616 | if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) { |
e01de1c9 JH |
617 | if (entry->flag & REF_BROKEN) |
618 | return 0; /* ignore dangling symref */ | |
f8948e2f JH |
619 | if (!has_sha1_file(entry->sha1)) { |
620 | error("%s does not point to a valid object!", entry->name); | |
621 | return 0; | |
622 | } | |
ef06b918 | 623 | } |
0ae91be0 | 624 | current_ref = entry; |
ef06b918 JH |
625 | return fn(entry->name + trim, entry->sha1, entry->flag, cb_data); |
626 | } | |
627 | ||
d08bae7e IL |
628 | static int filter_refs(const char *ref, const unsigned char *sha, int flags, |
629 | void *data) | |
630 | { | |
631 | struct ref_filter *filter = (struct ref_filter *)data; | |
632 | if (fnmatch(filter->pattern, ref, 0)) | |
633 | return 0; | |
634 | return filter->fn(ref, sha, flags, filter->cb_data); | |
635 | } | |
636 | ||
cf0adba7 JH |
637 | int peel_ref(const char *ref, unsigned char *sha1) |
638 | { | |
639 | int flag; | |
640 | unsigned char base[20]; | |
641 | struct object *o; | |
642 | ||
0ae91be0 SP |
643 | if (current_ref && (current_ref->name == ref |
644 | || !strcmp(current_ref->name, ref))) { | |
645 | if (current_ref->flag & REF_KNOWS_PEELED) { | |
646 | hashcpy(sha1, current_ref->peeled); | |
647 | return 0; | |
648 | } | |
649 | hashcpy(base, current_ref->sha1); | |
650 | goto fallback; | |
651 | } | |
652 | ||
cf0adba7 JH |
653 | if (!resolve_ref(ref, base, 1, &flag)) |
654 | return -1; | |
655 | ||
656 | if ((flag & REF_ISPACKED)) { | |
e9c4c111 JP |
657 | struct ref_array *array = get_packed_refs(NULL); |
658 | struct ref_entry *r = search_ref_array(array, ref); | |
cf0adba7 | 659 | |
e9c4c111 JP |
660 | if (r != NULL && r->flag & REF_KNOWS_PEELED) { |
661 | hashcpy(sha1, r->peeled); | |
662 | return 0; | |
cf0adba7 | 663 | } |
cf0adba7 JH |
664 | } |
665 | ||
0ae91be0 | 666 | fallback: |
cf0adba7 | 667 | o = parse_object(base); |
8c87dc77 | 668 | if (o && o->type == OBJ_TAG) { |
cf0adba7 JH |
669 | o = deref_tag(o, ref, 0); |
670 | if (o) { | |
671 | hashcpy(sha1, o->sha1); | |
672 | return 0; | |
673 | } | |
674 | } | |
675 | return -1; | |
676 | } | |
677 | ||
0bad611b HV |
678 | static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn, |
679 | int trim, int flags, void *cb_data) | |
8a65ff76 | 680 | { |
e9c4c111 JP |
681 | int retval = 0, i, p = 0, l = 0; |
682 | struct ref_array *packed = get_packed_refs(submodule); | |
683 | struct ref_array *loose = get_loose_refs(submodule); | |
8a65ff76 | 684 | |
e9c4c111 | 685 | struct ref_array *extra = &extra_refs; |
e142a3c6 | 686 | |
e9c4c111 JP |
687 | for (i = 0; i < extra->nr; i++) |
688 | retval = do_one_ref(base, fn, trim, flags, cb_data, extra->refs[i]); | |
e142a3c6 | 689 | |
e9c4c111 JP |
690 | while (p < packed->nr && l < loose->nr) { |
691 | struct ref_entry *entry; | |
692 | int cmp = strcmp(packed->refs[p]->name, loose->refs[l]->name); | |
e1e22e37 | 693 | if (!cmp) { |
e9c4c111 | 694 | p++; |
e1e22e37 | 695 | continue; |
6cada6a9 | 696 | } |
e1e22e37 | 697 | if (cmp > 0) { |
e9c4c111 | 698 | entry = loose->refs[l++]; |
e1e22e37 | 699 | } else { |
e9c4c111 | 700 | entry = packed->refs[p++]; |
e1e22e37 | 701 | } |
f8948e2f | 702 | retval = do_one_ref(base, fn, trim, flags, cb_data, entry); |
e1e22e37 | 703 | if (retval) |
0ae91be0 | 704 | goto end_each; |
e1e22e37 | 705 | } |
8a65ff76 | 706 | |
e9c4c111 JP |
707 | if (l < loose->nr) { |
708 | p = l; | |
709 | packed = loose; | |
710 | } | |
711 | ||
712 | for (; p < packed->nr; p++) { | |
713 | retval = do_one_ref(base, fn, trim, flags, cb_data, packed->refs[p]); | |
ef06b918 | 714 | if (retval) |
0ae91be0 | 715 | goto end_each; |
8a65ff76 | 716 | } |
0ae91be0 SP |
717 | |
718 | end_each: | |
719 | current_ref = NULL; | |
720 | return retval; | |
8a65ff76 LT |
721 | } |
722 | ||
0bad611b HV |
723 | |
724 | static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data) | |
723c31fe LT |
725 | { |
726 | unsigned char sha1[20]; | |
8da19775 JH |
727 | int flag; |
728 | ||
0bad611b HV |
729 | if (submodule) { |
730 | if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0) | |
731 | return fn("HEAD", sha1, 0, cb_data); | |
732 | ||
733 | return 0; | |
734 | } | |
735 | ||
8da19775 JH |
736 | if (resolve_ref("HEAD", sha1, 1, &flag)) |
737 | return fn("HEAD", sha1, flag, cb_data); | |
0bad611b | 738 | |
2f34ba32 | 739 | return 0; |
723c31fe LT |
740 | } |
741 | ||
0bad611b HV |
742 | int head_ref(each_ref_fn fn, void *cb_data) |
743 | { | |
744 | return do_head_ref(NULL, fn, cb_data); | |
745 | } | |
746 | ||
9ef6aeb0 HV |
747 | int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
748 | { | |
749 | return do_head_ref(submodule, fn, cb_data); | |
750 | } | |
751 | ||
cb5d709f | 752 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 753 | { |
b3cfc406 | 754 | return do_for_each_ref(NULL, "", fn, 0, 0, cb_data); |
a62be77f SE |
755 | } |
756 | ||
9ef6aeb0 HV |
757 | int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
758 | { | |
b3cfc406 | 759 | return do_for_each_ref(submodule, "", fn, 0, 0, cb_data); |
a62be77f SE |
760 | } |
761 | ||
2a8177b6 CC |
762 | int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data) |
763 | { | |
0bad611b | 764 | return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data); |
2a8177b6 CC |
765 | } |
766 | ||
9ef6aeb0 HV |
767 | int for_each_ref_in_submodule(const char *submodule, const char *prefix, |
768 | each_ref_fn fn, void *cb_data) | |
769 | { | |
770 | return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data); | |
2a8177b6 CC |
771 | } |
772 | ||
cb5d709f | 773 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 774 | { |
2a8177b6 | 775 | return for_each_ref_in("refs/tags/", fn, cb_data); |
a62be77f SE |
776 | } |
777 | ||
9ef6aeb0 HV |
778 | int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
779 | { | |
780 | return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data); | |
781 | } | |
782 | ||
cb5d709f | 783 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 784 | { |
2a8177b6 | 785 | return for_each_ref_in("refs/heads/", fn, cb_data); |
a62be77f SE |
786 | } |
787 | ||
9ef6aeb0 HV |
788 | int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
789 | { | |
790 | return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data); | |
791 | } | |
792 | ||
cb5d709f | 793 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 794 | { |
2a8177b6 | 795 | return for_each_ref_in("refs/remotes/", fn, cb_data); |
f8948e2f JH |
796 | } |
797 | ||
9ef6aeb0 HV |
798 | int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
799 | { | |
800 | return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data); | |
801 | } | |
802 | ||
29268700 CC |
803 | int for_each_replace_ref(each_ref_fn fn, void *cb_data) |
804 | { | |
0bad611b | 805 | return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data); |
29268700 CC |
806 | } |
807 | ||
a1bea2c1 JT |
808 | int head_ref_namespaced(each_ref_fn fn, void *cb_data) |
809 | { | |
810 | struct strbuf buf = STRBUF_INIT; | |
811 | int ret = 0; | |
812 | unsigned char sha1[20]; | |
813 | int flag; | |
814 | ||
815 | strbuf_addf(&buf, "%sHEAD", get_git_namespace()); | |
816 | if (resolve_ref(buf.buf, sha1, 1, &flag)) | |
817 | ret = fn(buf.buf, sha1, flag, cb_data); | |
818 | strbuf_release(&buf); | |
819 | ||
820 | return ret; | |
821 | } | |
822 | ||
823 | int for_each_namespaced_ref(each_ref_fn fn, void *cb_data) | |
824 | { | |
825 | struct strbuf buf = STRBUF_INIT; | |
826 | int ret; | |
827 | strbuf_addf(&buf, "%srefs/", get_git_namespace()); | |
828 | ret = do_for_each_ref(NULL, buf.buf, fn, 0, 0, cb_data); | |
829 | strbuf_release(&buf); | |
830 | return ret; | |
831 | } | |
832 | ||
b09fe971 IL |
833 | int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, |
834 | const char *prefix, void *cb_data) | |
d08bae7e IL |
835 | { |
836 | struct strbuf real_pattern = STRBUF_INIT; | |
837 | struct ref_filter filter; | |
d08bae7e IL |
838 | int ret; |
839 | ||
b09fe971 | 840 | if (!prefix && prefixcmp(pattern, "refs/")) |
d08bae7e | 841 | strbuf_addstr(&real_pattern, "refs/"); |
b09fe971 IL |
842 | else if (prefix) |
843 | strbuf_addstr(&real_pattern, prefix); | |
d08bae7e IL |
844 | strbuf_addstr(&real_pattern, pattern); |
845 | ||
894a9d33 | 846 | if (!has_glob_specials(pattern)) { |
9517e6b8 | 847 | /* Append implied '/' '*' if not present. */ |
d08bae7e IL |
848 | if (real_pattern.buf[real_pattern.len - 1] != '/') |
849 | strbuf_addch(&real_pattern, '/'); | |
850 | /* No need to check for '*', there is none. */ | |
851 | strbuf_addch(&real_pattern, '*'); | |
852 | } | |
853 | ||
854 | filter.pattern = real_pattern.buf; | |
855 | filter.fn = fn; | |
856 | filter.cb_data = cb_data; | |
857 | ret = for_each_ref(filter_refs, &filter); | |
858 | ||
859 | strbuf_release(&real_pattern); | |
860 | return ret; | |
861 | } | |
862 | ||
b09fe971 IL |
863 | int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data) |
864 | { | |
865 | return for_each_glob_ref_in(fn, pattern, NULL, cb_data); | |
866 | } | |
867 | ||
f8948e2f JH |
868 | int for_each_rawref(each_ref_fn fn, void *cb_data) |
869 | { | |
b3cfc406 | 870 | return do_for_each_ref(NULL, "", fn, 0, |
f8948e2f | 871 | DO_FOR_EACH_INCLUDE_BROKEN, cb_data); |
8a65ff76 LT |
872 | } |
873 | ||
03feddd6 JH |
874 | /* |
875 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
876 | * We do not like it if: | |
877 | * | |
878 | * - any path component of it begins with ".", or | |
879 | * - it has double dots "..", or | |
880 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
881 | * - it ends with a "/". | |
3e262b95 | 882 | * - it ends with ".lock" |
a4c2e699 | 883 | * - it contains a "\" (backslash) |
03feddd6 JH |
884 | */ |
885 | ||
9224b73b | 886 | /* Return true iff ch is not allowed in reference names. */ |
03feddd6 JH |
887 | static inline int bad_ref_char(int ch) |
888 | { | |
f3738c1c | 889 | if (((unsigned) ch) <= ' ' || ch == 0x7f || |
a4c2e699 | 890 | ch == '~' || ch == '^' || ch == ':' || ch == '\\') |
8558fd9e DB |
891 | return 1; |
892 | /* 2.13 Pattern Matching Notation */ | |
9224b73b | 893 | if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */ |
8558fd9e | 894 | return 1; |
8558fd9e | 895 | return 0; |
03feddd6 JH |
896 | } |
897 | ||
49295d4e MH |
898 | /* |
899 | * Try to read one refname component from the front of ref. Return | |
900 | * the length of the component found, or -1 if the component is not | |
901 | * legal. | |
902 | */ | |
dce4bab6 | 903 | static int check_refname_component(const char *ref, int flags) |
95fc7512 | 904 | { |
49295d4e MH |
905 | const char *cp; |
906 | char last = '\0'; | |
03feddd6 | 907 | |
49295d4e MH |
908 | for (cp = ref; ; cp++) { |
909 | char ch = *cp; | |
910 | if (ch == '\0' || ch == '/') | |
911 | break; | |
912 | if (bad_ref_char(ch)) | |
913 | return -1; /* Illegal character in refname. */ | |
914 | if (last == '.' && ch == '.') | |
915 | return -1; /* Refname contains "..". */ | |
916 | if (last == '@' && ch == '{') | |
917 | return -1; /* Refname contains "@{". */ | |
cbdffe40 | 918 | last = ch; |
49295d4e MH |
919 | } |
920 | if (cp == ref) | |
921 | return -1; /* Component has zero length. */ | |
dce4bab6 MH |
922 | if (ref[0] == '.') { |
923 | if (!(flags & REFNAME_DOT_COMPONENT)) | |
924 | return -1; /* Component starts with '.'. */ | |
925 | /* | |
926 | * Even if leading dots are allowed, don't allow "." | |
927 | * as a component (".." is prevented by a rule above). | |
928 | */ | |
929 | if (ref[1] == '\0') | |
930 | return -1; /* Component equals ".". */ | |
931 | } | |
7e9d2fe9 MH |
932 | if (cp - ref >= 5 && !memcmp(cp - 5, ".lock", 5)) |
933 | return -1; /* Refname ends with ".lock". */ | |
49295d4e MH |
934 | return cp - ref; |
935 | } | |
936 | ||
8d9c5010 | 937 | int check_refname_format(const char *ref, int flags) |
95fc7512 | 938 | { |
49295d4e | 939 | int component_len, component_count = 0; |
03feddd6 | 940 | |
03feddd6 | 941 | while (1) { |
49295d4e | 942 | /* We are at the start of a path component. */ |
dce4bab6 | 943 | component_len = check_refname_component(ref, flags); |
49295d4e MH |
944 | if (component_len < 0) { |
945 | if ((flags & REFNAME_REFSPEC_PATTERN) && | |
946 | ref[0] == '*' && | |
947 | (ref[1] == '\0' || ref[1] == '/')) { | |
8d9c5010 MH |
948 | /* Accept one wildcard as a full refname component. */ |
949 | flags &= ~REFNAME_REFSPEC_PATTERN; | |
49295d4e MH |
950 | component_len = 1; |
951 | } else { | |
8d9c5010 | 952 | return -1; |
49295d4e | 953 | } |
03feddd6 | 954 | } |
49295d4e MH |
955 | component_count++; |
956 | if (ref[component_len] == '\0') | |
957 | break; | |
958 | /* Skip to next component. */ | |
959 | ref += component_len + 1; | |
03feddd6 | 960 | } |
49295d4e MH |
961 | |
962 | if (ref[component_len - 1] == '.') | |
963 | return -1; /* Refname ends with '.'. */ | |
49295d4e MH |
964 | if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2) |
965 | return -1; /* Refname has only one component. */ | |
966 | return 0; | |
95fc7512 DB |
967 | } |
968 | ||
4577e483 | 969 | const char *prettify_refname(const char *name) |
a9c37a72 | 970 | { |
a9c37a72 DB |
971 | return name + ( |
972 | !prefixcmp(name, "refs/heads/") ? 11 : | |
973 | !prefixcmp(name, "refs/tags/") ? 10 : | |
974 | !prefixcmp(name, "refs/remotes/") ? 13 : | |
975 | 0); | |
976 | } | |
977 | ||
79803322 SP |
978 | const char *ref_rev_parse_rules[] = { |
979 | "%.*s", | |
980 | "refs/%.*s", | |
981 | "refs/tags/%.*s", | |
982 | "refs/heads/%.*s", | |
983 | "refs/remotes/%.*s", | |
984 | "refs/remotes/%.*s/HEAD", | |
985 | NULL | |
986 | }; | |
987 | ||
605b4978 SP |
988 | const char *ref_fetch_rules[] = { |
989 | "%.*s", | |
990 | "refs/%.*s", | |
991 | "refs/heads/%.*s", | |
992 | NULL | |
993 | }; | |
994 | ||
79803322 SP |
995 | int refname_match(const char *abbrev_name, const char *full_name, const char **rules) |
996 | { | |
997 | const char **p; | |
998 | const int abbrev_name_len = strlen(abbrev_name); | |
999 | ||
1000 | for (p = rules; *p; p++) { | |
1001 | if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { | |
1002 | return 1; | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | return 0; | |
1007 | } | |
1008 | ||
e5f38ec3 | 1009 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
1010 | const unsigned char *old_sha1, int mustexist) |
1011 | { | |
8da19775 | 1012 | if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 1013 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
1014 | unlock_ref(lock); |
1015 | return NULL; | |
1016 | } | |
a89fccd2 | 1017 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 1018 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
1019 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
1020 | unlock_ref(lock); | |
1021 | return NULL; | |
1022 | } | |
1023 | return lock; | |
1024 | } | |
1025 | ||
7155b727 | 1026 | static int remove_empty_directories(const char *file) |
bc7127ef JH |
1027 | { |
1028 | /* we want to create a file but there is a directory there; | |
1029 | * if that is an empty directory (or a directory that contains | |
1030 | * only empty directories), remove them. | |
1031 | */ | |
7155b727 JS |
1032 | struct strbuf path; |
1033 | int result; | |
bc7127ef | 1034 | |
7155b727 JS |
1035 | strbuf_init(&path, 20); |
1036 | strbuf_addstr(&path, file); | |
1037 | ||
a0f4afbe | 1038 | result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY); |
7155b727 JS |
1039 | |
1040 | strbuf_release(&path); | |
1041 | ||
1042 | return result; | |
bc7127ef JH |
1043 | } |
1044 | ||
c976d415 | 1045 | static int is_refname_available(const char *ref, const char *oldref, |
e9c4c111 | 1046 | struct ref_array *array, int quiet) |
c976d415 | 1047 | { |
e9c4c111 JP |
1048 | int i, namlen = strlen(ref); /* e.g. 'foo/bar' */ |
1049 | for (i = 0; i < array->nr; i++ ) { | |
1050 | struct ref_entry *entry = array->refs[i]; | |
1051 | /* entry->name could be 'foo' or 'foo/bar/baz' */ | |
1052 | if (!oldref || strcmp(oldref, entry->name)) { | |
1053 | int len = strlen(entry->name); | |
c976d415 | 1054 | int cmplen = (namlen < len) ? namlen : len; |
e9c4c111 JP |
1055 | const char *lead = (namlen < len) ? entry->name : ref; |
1056 | if (!strncmp(ref, entry->name, cmplen) && | |
c976d415 LH |
1057 | lead[cmplen] == '/') { |
1058 | if (!quiet) | |
1059 | error("'%s' exists; cannot create '%s'", | |
e9c4c111 | 1060 | entry->name, ref); |
c976d415 LH |
1061 | return 0; |
1062 | } | |
1063 | } | |
c976d415 LH |
1064 | } |
1065 | return 1; | |
1066 | } | |
1067 | ||
68db31cc | 1068 | static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p) |
4bd18c43 | 1069 | { |
434cd0cd | 1070 | char *ref_file; |
ed378ec7 | 1071 | const char *orig_ref = ref; |
4bd18c43 | 1072 | struct ref_lock *lock; |
5cc3cef9 | 1073 | int last_errno = 0; |
acd3b9ec | 1074 | int type, lflags; |
4431fcc4 | 1075 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
5bdd8d4a | 1076 | int missing = 0; |
4bd18c43 SP |
1077 | |
1078 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
1079 | lock->lock_fd = -1; | |
1080 | ||
68db31cc | 1081 | ref = resolve_ref(ref, lock->old_sha1, mustexist, &type); |
bc7127ef JH |
1082 | if (!ref && errno == EISDIR) { |
1083 | /* we are trying to lock foo but we used to | |
1084 | * have foo/bar which now does not exist; | |
1085 | * it is normal for the empty directory 'foo' | |
1086 | * to remain. | |
1087 | */ | |
1088 | ref_file = git_path("%s", orig_ref); | |
5cc3cef9 JH |
1089 | if (remove_empty_directories(ref_file)) { |
1090 | last_errno = errno; | |
1091 | error("there are still refs under '%s'", orig_ref); | |
1092 | goto error_return; | |
1093 | } | |
68db31cc | 1094 | ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type); |
bc7127ef | 1095 | } |
68db31cc SV |
1096 | if (type_p) |
1097 | *type_p = type; | |
ed378ec7 | 1098 | if (!ref) { |
5cc3cef9 | 1099 | last_errno = errno; |
818f477c | 1100 | error("unable to resolve reference %s: %s", |
ed378ec7 | 1101 | orig_ref, strerror(errno)); |
5cc3cef9 | 1102 | goto error_return; |
4bd18c43 | 1103 | } |
5bdd8d4a | 1104 | missing = is_null_sha1(lock->old_sha1); |
c976d415 LH |
1105 | /* When the ref did not exist and we are creating it, |
1106 | * make sure there is no existing ref that is packed | |
1107 | * whose name begins with our refname, nor a ref whose | |
1108 | * name is a proper prefix of our refname. | |
1109 | */ | |
5bdd8d4a | 1110 | if (missing && |
0bad611b | 1111 | !is_refname_available(ref, NULL, get_packed_refs(NULL), 0)) { |
f475e08e | 1112 | last_errno = ENOTDIR; |
c976d415 | 1113 | goto error_return; |
f475e08e | 1114 | } |
22a3844e | 1115 | |
c33d5174 | 1116 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 1117 | |
acd3b9ec JH |
1118 | lflags = LOCK_DIE_ON_ERROR; |
1119 | if (flags & REF_NODEREF) { | |
68db31cc | 1120 | ref = orig_ref; |
acd3b9ec JH |
1121 | lflags |= LOCK_NODEREF; |
1122 | } | |
434cd0cd | 1123 | lock->ref_name = xstrdup(ref); |
1655707c | 1124 | lock->orig_ref_name = xstrdup(orig_ref); |
7c1a278d | 1125 | ref_file = git_path("%s", ref); |
5bdd8d4a | 1126 | if (missing) |
68db31cc SV |
1127 | lock->force_write = 1; |
1128 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
1129 | lock->force_write = 1; | |
4bd18c43 | 1130 | |
5cc3cef9 JH |
1131 | if (safe_create_leading_directories(ref_file)) { |
1132 | last_errno = errno; | |
1133 | error("unable to create directory for %s", ref_file); | |
1134 | goto error_return; | |
1135 | } | |
4bd18c43 | 1136 | |
acd3b9ec | 1137 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags); |
4bd18c43 | 1138 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; |
5cc3cef9 JH |
1139 | |
1140 | error_return: | |
1141 | unlock_ref(lock); | |
1142 | errno = last_errno; | |
1143 | return NULL; | |
4bd18c43 SP |
1144 | } |
1145 | ||
4431fcc4 | 1146 | struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1) |
95fc7512 | 1147 | { |
53cce84c | 1148 | char refpath[PATH_MAX]; |
8d9c5010 | 1149 | if (check_refname_format(ref, 0)) |
4bd18c43 | 1150 | return NULL; |
53cce84c | 1151 | strcpy(refpath, mkpath("refs/%s", ref)); |
68db31cc | 1152 | return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL); |
4bd18c43 SP |
1153 | } |
1154 | ||
68db31cc | 1155 | struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags) |
4bd18c43 | 1156 | { |
8d9c5010 | 1157 | if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL)) |
257f3020 | 1158 | return NULL; |
8d9c5010 | 1159 | return lock_ref_sha1_basic(ref, old_sha1, flags, NULL); |
c0277d15 JH |
1160 | } |
1161 | ||
26a063a1 JH |
1162 | static struct lock_file packlock; |
1163 | ||
c0277d15 JH |
1164 | static int repack_without_ref(const char *refname) |
1165 | { | |
e9c4c111 JP |
1166 | struct ref_array *packed; |
1167 | struct ref_entry *ref; | |
1168 | int fd, i; | |
c0277d15 | 1169 | |
e9c4c111 JP |
1170 | packed = get_packed_refs(NULL); |
1171 | ref = search_ref_array(packed, refname); | |
1172 | if (ref == NULL) | |
c0277d15 | 1173 | return 0; |
c0277d15 | 1174 | fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0); |
1b018fd9 MV |
1175 | if (fd < 0) { |
1176 | unable_to_lock_error(git_path("packed-refs"), errno); | |
c0277d15 | 1177 | return error("cannot delete '%s' from packed refs", refname); |
1b018fd9 | 1178 | } |
c0277d15 | 1179 | |
e9c4c111 | 1180 | for (i = 0; i < packed->nr; i++) { |
c0277d15 JH |
1181 | char line[PATH_MAX + 100]; |
1182 | int len; | |
1183 | ||
e9c4c111 JP |
1184 | ref = packed->refs[i]; |
1185 | ||
1186 | if (!strcmp(refname, ref->name)) | |
c0277d15 JH |
1187 | continue; |
1188 | len = snprintf(line, sizeof(line), "%s %s\n", | |
e9c4c111 | 1189 | sha1_to_hex(ref->sha1), ref->name); |
c0277d15 JH |
1190 | /* this should not happen but just being defensive */ |
1191 | if (len > sizeof(line)) | |
e9c4c111 | 1192 | die("too long a refname '%s'", ref->name); |
c0277d15 JH |
1193 | write_or_die(fd, line, len); |
1194 | } | |
1195 | return commit_lock_file(&packlock); | |
1196 | } | |
1197 | ||
eca35a25 | 1198 | int delete_ref(const char *refname, const unsigned char *sha1, int delopt) |
c0277d15 JH |
1199 | { |
1200 | struct ref_lock *lock; | |
eca35a25 | 1201 | int err, i = 0, ret = 0, flag = 0; |
c0277d15 | 1202 | |
68db31cc | 1203 | lock = lock_ref_sha1_basic(refname, sha1, 0, &flag); |
c0277d15 JH |
1204 | if (!lock) |
1205 | return 1; | |
045a476f | 1206 | if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) { |
c0277d15 | 1207 | /* loose */ |
eca35a25 MV |
1208 | const char *path; |
1209 | ||
1210 | if (!(delopt & REF_NODEREF)) { | |
1211 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
1212 | lock->lk->filename[i] = 0; | |
1213 | path = lock->lk->filename; | |
1214 | } else { | |
9db56f71 | 1215 | path = git_path("%s", refname); |
eca35a25 | 1216 | } |
691f1a28 AR |
1217 | err = unlink_or_warn(path); |
1218 | if (err && errno != ENOENT) | |
c0277d15 | 1219 | ret = 1; |
691f1a28 | 1220 | |
eca35a25 MV |
1221 | if (!(delopt & REF_NODEREF)) |
1222 | lock->lk->filename[i] = '.'; | |
c0277d15 JH |
1223 | } |
1224 | /* removing the loose one could have resurrected an earlier | |
1225 | * packed one. Also, if it was not loose we need to repack | |
1226 | * without it. | |
1227 | */ | |
1228 | ret |= repack_without_ref(refname); | |
1229 | ||
691f1a28 | 1230 | unlink_or_warn(git_path("logs/%s", lock->ref_name)); |
79c7ca54 | 1231 | invalidate_ref_cache(); |
c0277d15 JH |
1232 | unlock_ref(lock); |
1233 | return ret; | |
4bd18c43 SP |
1234 | } |
1235 | ||
765c2258 PH |
1236 | /* |
1237 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
1238 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
1239 | * | |
1240 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
1241 | * live into logs/refs. | |
1242 | */ | |
1243 | #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log" | |
1244 | ||
678d0f4c | 1245 | int rename_ref(const char *oldref, const char *newref, const char *logmsg) |
c976d415 LH |
1246 | { |
1247 | static const char renamed_ref[] = "RENAMED-REF"; | |
1248 | unsigned char sha1[20], orig_sha1[20]; | |
1249 | int flag = 0, logmoved = 0; | |
1250 | struct ref_lock *lock; | |
c976d415 | 1251 | struct stat loginfo; |
16c2bfbb | 1252 | int log = !lstat(git_path("logs/%s", oldref), &loginfo); |
eca35a25 | 1253 | const char *symref = NULL; |
c976d415 | 1254 | |
450d4c0f | 1255 | if (log && S_ISLNK(loginfo.st_mode)) |
c976d415 LH |
1256 | return error("reflog for %s is a symlink", oldref); |
1257 | ||
eca35a25 MV |
1258 | symref = resolve_ref(oldref, orig_sha1, 1, &flag); |
1259 | if (flag & REF_ISSYMREF) | |
fa58186c MV |
1260 | return error("refname %s is a symbolic ref, renaming it is not supported", |
1261 | oldref); | |
eca35a25 | 1262 | if (!symref) |
c976d415 LH |
1263 | return error("refname %s not found", oldref); |
1264 | ||
0bad611b | 1265 | if (!is_refname_available(newref, oldref, get_packed_refs(NULL), 0)) |
c976d415 LH |
1266 | return 1; |
1267 | ||
0bad611b | 1268 | if (!is_refname_available(newref, oldref, get_loose_refs(NULL), 0)) |
c976d415 LH |
1269 | return 1; |
1270 | ||
68db31cc | 1271 | lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL); |
c976d415 LH |
1272 | if (!lock) |
1273 | return error("unable to lock %s", renamed_ref); | |
1274 | lock->force_write = 1; | |
678d0f4c | 1275 | if (write_ref_sha1(lock, orig_sha1, logmsg)) |
c976d415 LH |
1276 | return error("unable to save current sha1 in %s", renamed_ref); |
1277 | ||
765c2258 PH |
1278 | if (log && rename(git_path("logs/%s", oldref), git_path(TMP_RENAMED_LOG))) |
1279 | return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s", | |
c976d415 LH |
1280 | oldref, strerror(errno)); |
1281 | ||
eca35a25 | 1282 | if (delete_ref(oldref, orig_sha1, REF_NODEREF)) { |
c976d415 LH |
1283 | error("unable to delete old %s", oldref); |
1284 | goto rollback; | |
1285 | } | |
1286 | ||
eca35a25 | 1287 | if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1, REF_NODEREF)) { |
c976d415 LH |
1288 | if (errno==EISDIR) { |
1289 | if (remove_empty_directories(git_path("%s", newref))) { | |
1290 | error("Directory not empty: %s", newref); | |
1291 | goto rollback; | |
1292 | } | |
1293 | } else { | |
1294 | error("unable to delete existing %s", newref); | |
1295 | goto rollback; | |
1296 | } | |
1297 | } | |
1298 | ||
1299 | if (log && safe_create_leading_directories(git_path("logs/%s", newref))) { | |
1300 | error("unable to create directory for %s", newref); | |
1301 | goto rollback; | |
1302 | } | |
1303 | ||
1304 | retry: | |
765c2258 | 1305 | if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newref))) { |
d9e74d57 JR |
1306 | if (errno==EISDIR || errno==ENOTDIR) { |
1307 | /* | |
1308 | * rename(a, b) when b is an existing | |
1309 | * directory ought to result in ISDIR, but | |
1310 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
1311 | */ | |
c976d415 LH |
1312 | if (remove_empty_directories(git_path("logs/%s", newref))) { |
1313 | error("Directory not empty: logs/%s", newref); | |
1314 | goto rollback; | |
1315 | } | |
1316 | goto retry; | |
1317 | } else { | |
765c2258 | 1318 | error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s", |
c976d415 LH |
1319 | newref, strerror(errno)); |
1320 | goto rollback; | |
1321 | } | |
1322 | } | |
1323 | logmoved = log; | |
1324 | ||
68db31cc | 1325 | lock = lock_ref_sha1_basic(newref, NULL, 0, NULL); |
c976d415 LH |
1326 | if (!lock) { |
1327 | error("unable to lock %s for update", newref); | |
1328 | goto rollback; | |
1329 | } | |
c976d415 LH |
1330 | lock->force_write = 1; |
1331 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 1332 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
c976d415 LH |
1333 | error("unable to write current sha1 into %s", newref); |
1334 | goto rollback; | |
1335 | } | |
1336 | ||
1337 | return 0; | |
1338 | ||
1339 | rollback: | |
68db31cc | 1340 | lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL); |
c976d415 LH |
1341 | if (!lock) { |
1342 | error("unable to lock %s for rollback", oldref); | |
1343 | goto rollbacklog; | |
1344 | } | |
1345 | ||
1346 | lock->force_write = 1; | |
1347 | flag = log_all_ref_updates; | |
1348 | log_all_ref_updates = 0; | |
1349 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
1350 | error("unable to write current sha1 into %s", oldref); | |
1351 | log_all_ref_updates = flag; | |
1352 | ||
1353 | rollbacklog: | |
1354 | if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref))) | |
1355 | error("unable to restore logfile %s from %s: %s", | |
1356 | oldref, newref, strerror(errno)); | |
1357 | if (!logmoved && log && | |
765c2258 PH |
1358 | rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldref))) |
1359 | error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s", | |
c976d415 LH |
1360 | oldref, strerror(errno)); |
1361 | ||
1362 | return 1; | |
1363 | } | |
1364 | ||
435fc852 | 1365 | int close_ref(struct ref_lock *lock) |
b531394d BC |
1366 | { |
1367 | if (close_lock_file(lock->lk)) | |
1368 | return -1; | |
1369 | lock->lock_fd = -1; | |
1370 | return 0; | |
1371 | } | |
1372 | ||
435fc852 | 1373 | int commit_ref(struct ref_lock *lock) |
b531394d BC |
1374 | { |
1375 | if (commit_lock_file(lock->lk)) | |
1376 | return -1; | |
1377 | lock->lock_fd = -1; | |
1378 | return 0; | |
1379 | } | |
1380 | ||
e5f38ec3 | 1381 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 | 1382 | { |
4ed7cd3a BC |
1383 | /* Do not free lock->lk -- atexit() still looks at them */ |
1384 | if (lock->lk) | |
1385 | rollback_lock_file(lock->lk); | |
434cd0cd | 1386 | free(lock->ref_name); |
1655707c | 1387 | free(lock->orig_ref_name); |
4bd18c43 SP |
1388 | free(lock); |
1389 | } | |
1390 | ||
0ec29a47 JH |
1391 | /* |
1392 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
1393 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
1394 | * because reflog file is one line per entry. | |
1395 | */ | |
1396 | static int copy_msg(char *buf, const char *msg) | |
1397 | { | |
1398 | char *cp = buf; | |
1399 | char c; | |
1400 | int wasspace = 1; | |
1401 | ||
1402 | *cp++ = '\t'; | |
1403 | while ((c = *msg++)) { | |
1404 | if (wasspace && isspace(c)) | |
1405 | continue; | |
1406 | wasspace = isspace(c); | |
1407 | if (wasspace) | |
1408 | c = ' '; | |
1409 | *cp++ = c; | |
1410 | } | |
1411 | while (buf < cp && isspace(cp[-1])) | |
1412 | cp--; | |
1413 | *cp++ = '\n'; | |
1414 | return cp - buf; | |
1415 | } | |
1416 | ||
157aaea5 | 1417 | int log_ref_setup(const char *ref_name, char *logfile, int bufsize) |
6de08ae6 | 1418 | { |
859c3017 | 1419 | int logfd, oflags = O_APPEND | O_WRONLY; |
9a13f0b7 | 1420 | |
157aaea5 | 1421 | git_snpath(logfile, bufsize, "logs/%s", ref_name); |
4057deb5 | 1422 | if (log_all_ref_updates && |
cc44c765 JH |
1423 | (!prefixcmp(ref_name, "refs/heads/") || |
1424 | !prefixcmp(ref_name, "refs/remotes/") || | |
b2e256b0 | 1425 | !prefixcmp(ref_name, "refs/notes/") || |
bd104db1 | 1426 | !strcmp(ref_name, "HEAD"))) { |
157aaea5 | 1427 | if (safe_create_leading_directories(logfile) < 0) |
6de08ae6 | 1428 | return error("unable to create directory for %s", |
157aaea5 | 1429 | logfile); |
6de08ae6 SP |
1430 | oflags |= O_CREAT; |
1431 | } | |
1432 | ||
157aaea5 | 1433 | logfd = open(logfile, oflags, 0666); |
6de08ae6 | 1434 | if (logfd < 0) { |
1974bf62 | 1435 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 1436 | return 0; |
3b463c3f JH |
1437 | |
1438 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
157aaea5 | 1439 | if (remove_empty_directories(logfile)) { |
3b463c3f | 1440 | return error("There are still logs under '%s'", |
157aaea5 | 1441 | logfile); |
3b463c3f | 1442 | } |
157aaea5 | 1443 | logfd = open(logfile, oflags, 0666); |
3b463c3f JH |
1444 | } |
1445 | ||
1446 | if (logfd < 0) | |
1447 | return error("Unable to append to %s: %s", | |
157aaea5 | 1448 | logfile, strerror(errno)); |
6de08ae6 SP |
1449 | } |
1450 | ||
157aaea5 | 1451 | adjust_shared_perm(logfile); |
859c3017 EM |
1452 | close(logfd); |
1453 | return 0; | |
1454 | } | |
443b92b6 | 1455 | |
859c3017 EM |
1456 | static int log_ref_write(const char *ref_name, const unsigned char *old_sha1, |
1457 | const unsigned char *new_sha1, const char *msg) | |
1458 | { | |
1459 | int logfd, result, written, oflags = O_APPEND | O_WRONLY; | |
1460 | unsigned maxlen, len; | |
1461 | int msglen; | |
157aaea5 | 1462 | char log_file[PATH_MAX]; |
859c3017 EM |
1463 | char *logrec; |
1464 | const char *committer; | |
1465 | ||
1466 | if (log_all_ref_updates < 0) | |
1467 | log_all_ref_updates = !is_bare_repository(); | |
1468 | ||
157aaea5 | 1469 | result = log_ref_setup(ref_name, log_file, sizeof(log_file)); |
859c3017 EM |
1470 | if (result) |
1471 | return result; | |
1472 | ||
1473 | logfd = open(log_file, oflags); | |
1474 | if (logfd < 0) | |
1475 | return 0; | |
0ec29a47 | 1476 | msglen = msg ? strlen(msg) : 0; |
774751a8 | 1477 | committer = git_committer_info(0); |
8ac65937 JH |
1478 | maxlen = strlen(committer) + msglen + 100; |
1479 | logrec = xmalloc(maxlen); | |
1480 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
1481 | sha1_to_hex(old_sha1), |
1482 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
1483 | committer); |
1484 | if (msglen) | |
0ec29a47 | 1485 | len += copy_msg(logrec + len - 1, msg) - 1; |
93822c22 | 1486 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 | 1487 | free(logrec); |
91c8d590 | 1488 | if (close(logfd) != 0 || written != len) |
9a13f0b7 | 1489 | return error("Unable to append to %s", log_file); |
6de08ae6 SP |
1490 | return 0; |
1491 | } | |
1492 | ||
c3b0dec5 LT |
1493 | static int is_branch(const char *refname) |
1494 | { | |
1495 | return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/"); | |
1496 | } | |
1497 | ||
4bd18c43 SP |
1498 | int write_ref_sha1(struct ref_lock *lock, |
1499 | const unsigned char *sha1, const char *logmsg) | |
1500 | { | |
1501 | static char term = '\n'; | |
c3b0dec5 | 1502 | struct object *o; |
4bd18c43 SP |
1503 | |
1504 | if (!lock) | |
95fc7512 | 1505 | return -1; |
a89fccd2 | 1506 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
1507 | unlock_ref(lock); |
1508 | return 0; | |
95fc7512 | 1509 | } |
c3b0dec5 LT |
1510 | o = parse_object(sha1); |
1511 | if (!o) { | |
7be8b3ba | 1512 | error("Trying to write ref %s with nonexistent object %s", |
c3b0dec5 LT |
1513 | lock->ref_name, sha1_to_hex(sha1)); |
1514 | unlock_ref(lock); | |
1515 | return -1; | |
1516 | } | |
1517 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1518 | error("Trying to write non-commit object %s to branch %s", | |
1519 | sha1_to_hex(sha1), lock->ref_name); | |
1520 | unlock_ref(lock); | |
1521 | return -1; | |
1522 | } | |
93822c22 AW |
1523 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
1524 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
b531394d | 1525 | || close_ref(lock) < 0) { |
c33d5174 | 1526 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
1527 | unlock_ref(lock); |
1528 | return -1; | |
1529 | } | |
79c7ca54 | 1530 | invalidate_ref_cache(); |
bd104db1 NP |
1531 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
1532 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
1533 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
1534 | unlock_ref(lock); |
1535 | return -1; | |
1536 | } | |
605fac8b NP |
1537 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
1538 | /* | |
1539 | * Special hack: If a branch is updated directly and HEAD | |
1540 | * points to it (may happen on the remote side of a push | |
1541 | * for example) then logically the HEAD reflog should be | |
1542 | * updated too. | |
1543 | * A generic solution implies reverse symref information, | |
1544 | * but finding all symrefs pointing to the given branch | |
1545 | * would be rather costly for this rare event (the direct | |
1546 | * update of a branch) to be worth it. So let's cheat and | |
1547 | * check with HEAD only which should cover 99% of all usage | |
1548 | * scenarios (even 100% of the default ones). | |
1549 | */ | |
1550 | unsigned char head_sha1[20]; | |
1551 | int head_flag; | |
1552 | const char *head_ref; | |
1553 | head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag); | |
1554 | if (head_ref && (head_flag & REF_ISSYMREF) && | |
1555 | !strcmp(head_ref, lock->ref_name)) | |
1556 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
1557 | } | |
b531394d | 1558 | if (commit_ref(lock)) { |
434cd0cd | 1559 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
1560 | unlock_ref(lock); |
1561 | return -1; | |
1562 | } | |
4bd18c43 SP |
1563 | unlock_ref(lock); |
1564 | return 0; | |
95fc7512 | 1565 | } |
d556fae2 | 1566 | |
8b5157e4 NP |
1567 | int create_symref(const char *ref_target, const char *refs_heads_master, |
1568 | const char *logmsg) | |
41b625b0 NP |
1569 | { |
1570 | const char *lockpath; | |
1571 | char ref[1000]; | |
1572 | int fd, len, written; | |
a4f34cbb | 1573 | char *git_HEAD = git_pathdup("%s", ref_target); |
8b5157e4 NP |
1574 | unsigned char old_sha1[20], new_sha1[20]; |
1575 | ||
1576 | if (logmsg && read_ref(ref_target, old_sha1)) | |
1577 | hashclr(old_sha1); | |
41b625b0 | 1578 | |
d48744d1 JH |
1579 | if (safe_create_leading_directories(git_HEAD) < 0) |
1580 | return error("unable to create directory for %s", git_HEAD); | |
1581 | ||
41b625b0 NP |
1582 | #ifndef NO_SYMLINK_HEAD |
1583 | if (prefer_symlink_refs) { | |
1584 | unlink(git_HEAD); | |
1585 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 1586 | goto done; |
41b625b0 NP |
1587 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
1588 | } | |
1589 | #endif | |
1590 | ||
1591 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
1592 | if (sizeof(ref) <= len) { | |
1593 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 1594 | goto error_free_return; |
41b625b0 NP |
1595 | } |
1596 | lockpath = mkpath("%s.lock", git_HEAD); | |
1597 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
1598 | if (fd < 0) { | |
1599 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 1600 | goto error_free_return; |
41b625b0 NP |
1601 | } |
1602 | written = write_in_full(fd, ref, len); | |
91c8d590 | 1603 | if (close(fd) != 0 || written != len) { |
41b625b0 | 1604 | error("Unable to write to %s", lockpath); |
47fc52e2 | 1605 | goto error_unlink_return; |
41b625b0 NP |
1606 | } |
1607 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 1608 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 1609 | goto error_unlink_return; |
41b625b0 NP |
1610 | } |
1611 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 1612 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 | 1613 | error_unlink_return: |
691f1a28 | 1614 | unlink_or_warn(lockpath); |
47fc52e2 JH |
1615 | error_free_return: |
1616 | free(git_HEAD); | |
1617 | return -1; | |
41b625b0 | 1618 | } |
8b5157e4 | 1619 | |
ee96d11b | 1620 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 1621 | done: |
ee96d11b | 1622 | #endif |
8b5157e4 NP |
1623 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
1624 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
1625 | ||
47fc52e2 | 1626 | free(git_HEAD); |
41b625b0 NP |
1627 | return 0; |
1628 | } | |
1629 | ||
16d7cc90 JH |
1630 | static char *ref_msg(const char *line, const char *endp) |
1631 | { | |
1632 | const char *ep; | |
16d7cc90 | 1633 | line += 82; |
182af834 PH |
1634 | ep = memchr(line, '\n', endp - line); |
1635 | if (!ep) | |
1636 | ep = endp; | |
1637 | return xmemdupz(line, ep - line); | |
16d7cc90 JH |
1638 | } |
1639 | ||
1640 | 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 | 1641 | { |
e5229042 | 1642 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 | 1643 | char *tz_c; |
e29cb53a | 1644 | int logfd, tz, reccnt = 0; |
d556fae2 SP |
1645 | struct stat st; |
1646 | unsigned long date; | |
e5229042 | 1647 | unsigned char logged_sha1[20]; |
cb48cb58 | 1648 | void *log_mapped; |
dc49cd76 | 1649 | size_t mapsz; |
d556fae2 SP |
1650 | |
1651 | logfile = git_path("logs/%s", ref); | |
1652 | logfd = open(logfile, O_RDONLY, 0); | |
1653 | if (logfd < 0) | |
d824cbba | 1654 | die_errno("Unable to read log '%s'", logfile); |
d556fae2 SP |
1655 | fstat(logfd, &st); |
1656 | if (!st.st_size) | |
1657 | die("Log %s is empty.", logfile); | |
dc49cd76 SP |
1658 | mapsz = xsize_t(st.st_size); |
1659 | log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0); | |
cb48cb58 | 1660 | logdata = log_mapped; |
d556fae2 SP |
1661 | close(logfd); |
1662 | ||
e5229042 | 1663 | lastrec = NULL; |
d556fae2 SP |
1664 | rec = logend = logdata + st.st_size; |
1665 | while (logdata < rec) { | |
e29cb53a | 1666 | reccnt++; |
d556fae2 SP |
1667 | if (logdata < rec && *(rec-1) == '\n') |
1668 | rec--; | |
e5229042 SP |
1669 | lastgt = NULL; |
1670 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 1671 | rec--; |
e5229042 SP |
1672 | if (*rec == '>') |
1673 | lastgt = rec; | |
1674 | } | |
1675 | if (!lastgt) | |
d556fae2 | 1676 | die("Log %s is corrupt.", logfile); |
e5229042 | 1677 | date = strtoul(lastgt + 1, &tz_c, 10); |
ab2a1a32 | 1678 | if (date <= at_time || cnt == 0) { |
76a44c5c | 1679 | tz = strtoul(tz_c, NULL, 10); |
16d7cc90 JH |
1680 | if (msg) |
1681 | *msg = ref_msg(rec, logend); | |
1682 | if (cutoff_time) | |
1683 | *cutoff_time = date; | |
1684 | if (cutoff_tz) | |
1685 | *cutoff_tz = tz; | |
1686 | if (cutoff_cnt) | |
76a44c5c | 1687 | *cutoff_cnt = reccnt - 1; |
e5229042 SP |
1688 | if (lastrec) { |
1689 | if (get_sha1_hex(lastrec, logged_sha1)) | |
1690 | die("Log %s is corrupt.", logfile); | |
1691 | if (get_sha1_hex(rec + 41, sha1)) | |
1692 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1693 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1694 | warning("Log %s has gap after %s.", |
73013afd | 1695 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 | 1696 | } |
e5f38ec3 JH |
1697 | } |
1698 | else if (date == at_time) { | |
e5229042 SP |
1699 | if (get_sha1_hex(rec + 41, sha1)) |
1700 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
1701 | } |
1702 | else { | |
e5229042 SP |
1703 | if (get_sha1_hex(rec + 41, logged_sha1)) |
1704 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1705 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1706 | warning("Log %s unexpectedly ended on %s.", |
73013afd | 1707 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 SP |
1708 | } |
1709 | } | |
dc49cd76 | 1710 | munmap(log_mapped, mapsz); |
d556fae2 SP |
1711 | return 0; |
1712 | } | |
e5229042 | 1713 | lastrec = rec; |
ab2a1a32 JH |
1714 | if (cnt > 0) |
1715 | cnt--; | |
d556fae2 SP |
1716 | } |
1717 | ||
e5229042 SP |
1718 | rec = logdata; |
1719 | while (rec < logend && *rec != '>' && *rec != '\n') | |
1720 | rec++; | |
1721 | if (rec == logend || *rec == '\n') | |
d556fae2 | 1722 | die("Log %s is corrupt.", logfile); |
e5229042 | 1723 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
1724 | tz = strtoul(tz_c, NULL, 10); |
1725 | if (get_sha1_hex(logdata, sha1)) | |
1726 | die("Log %s is corrupt.", logfile); | |
d1a4489a JK |
1727 | if (is_null_sha1(sha1)) { |
1728 | if (get_sha1_hex(logdata + 41, sha1)) | |
1729 | die("Log %s is corrupt.", logfile); | |
1730 | } | |
16d7cc90 JH |
1731 | if (msg) |
1732 | *msg = ref_msg(logdata, logend); | |
dc49cd76 | 1733 | munmap(log_mapped, mapsz); |
16d7cc90 JH |
1734 | |
1735 | if (cutoff_time) | |
1736 | *cutoff_time = date; | |
1737 | if (cutoff_tz) | |
1738 | *cutoff_tz = tz; | |
1739 | if (cutoff_cnt) | |
1740 | *cutoff_cnt = reccnt; | |
1741 | return 1; | |
d556fae2 | 1742 | } |
2ff81662 | 1743 | |
101d15e0 | 1744 | int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long ofs, void *cb_data) |
2ff81662 JH |
1745 | { |
1746 | const char *logfile; | |
1747 | FILE *logfp; | |
8ca78803 | 1748 | struct strbuf sb = STRBUF_INIT; |
2266bf27 | 1749 | int ret = 0; |
2ff81662 JH |
1750 | |
1751 | logfile = git_path("logs/%s", ref); | |
1752 | logfp = fopen(logfile, "r"); | |
1753 | if (!logfp) | |
883d60fa | 1754 | return -1; |
101d15e0 JH |
1755 | |
1756 | if (ofs) { | |
1757 | struct stat statbuf; | |
1758 | if (fstat(fileno(logfp), &statbuf) || | |
1759 | statbuf.st_size < ofs || | |
1760 | fseek(logfp, -ofs, SEEK_END) || | |
8ca78803 | 1761 | strbuf_getwholeline(&sb, logfp, '\n')) { |
9d33f7c2 | 1762 | fclose(logfp); |
8ca78803 | 1763 | strbuf_release(&sb); |
101d15e0 | 1764 | return -1; |
9d33f7c2 | 1765 | } |
101d15e0 JH |
1766 | } |
1767 | ||
8ca78803 | 1768 | while (!strbuf_getwholeline(&sb, logfp, '\n')) { |
2ff81662 | 1769 | unsigned char osha1[20], nsha1[20]; |
883d60fa JS |
1770 | char *email_end, *message; |
1771 | unsigned long timestamp; | |
8ca78803 | 1772 | int tz; |
2ff81662 JH |
1773 | |
1774 | /* old SP new SP name <email> SP time TAB msg LF */ | |
8ca78803 RS |
1775 | if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' || |
1776 | get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' || | |
1777 | get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' || | |
1778 | !(email_end = strchr(sb.buf + 82, '>')) || | |
883d60fa JS |
1779 | email_end[1] != ' ' || |
1780 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
1781 | !message || message[0] != ' ' || | |
1782 | (message[1] != '+' && message[1] != '-') || | |
1783 | !isdigit(message[2]) || !isdigit(message[3]) || | |
b4dd4856 | 1784 | !isdigit(message[4]) || !isdigit(message[5])) |
2ff81662 | 1785 | continue; /* corrupt? */ |
883d60fa JS |
1786 | email_end[1] = '\0'; |
1787 | tz = strtol(message + 1, NULL, 10); | |
b4dd4856 JS |
1788 | if (message[6] != '\t') |
1789 | message += 6; | |
1790 | else | |
1791 | message += 7; | |
8ca78803 RS |
1792 | ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message, |
1793 | cb_data); | |
883d60fa | 1794 | if (ret) |
2266bf27 | 1795 | break; |
2ff81662 JH |
1796 | } |
1797 | fclose(logfp); | |
8ca78803 | 1798 | strbuf_release(&sb); |
2266bf27 | 1799 | return ret; |
2ff81662 | 1800 | } |
e29cb53a | 1801 | |
101d15e0 JH |
1802 | int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data) |
1803 | { | |
1804 | return for_each_recent_reflog_ent(ref, fn, 0, cb_data); | |
1805 | } | |
1806 | ||
eb8381c8 NP |
1807 | static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data) |
1808 | { | |
1809 | DIR *dir = opendir(git_path("logs/%s", base)); | |
fcee5a14 | 1810 | int retval = 0; |
eb8381c8 NP |
1811 | |
1812 | if (dir) { | |
1813 | struct dirent *de; | |
1814 | int baselen = strlen(base); | |
1815 | char *log = xmalloc(baselen + 257); | |
1816 | ||
1817 | memcpy(log, base, baselen); | |
1818 | if (baselen && base[baselen-1] != '/') | |
1819 | log[baselen++] = '/'; | |
1820 | ||
1821 | while ((de = readdir(dir)) != NULL) { | |
1822 | struct stat st; | |
1823 | int namelen; | |
1824 | ||
1825 | if (de->d_name[0] == '.') | |
1826 | continue; | |
1827 | namelen = strlen(de->d_name); | |
1828 | if (namelen > 255) | |
1829 | continue; | |
1830 | if (has_extension(de->d_name, ".lock")) | |
1831 | continue; | |
1832 | memcpy(log + baselen, de->d_name, namelen+1); | |
1833 | if (stat(git_path("logs/%s", log), &st) < 0) | |
1834 | continue; | |
1835 | if (S_ISDIR(st.st_mode)) { | |
1836 | retval = do_for_each_reflog(log, fn, cb_data); | |
1837 | } else { | |
1838 | unsigned char sha1[20]; | |
1839 | if (!resolve_ref(log, sha1, 0, NULL)) | |
1840 | retval = error("bad ref for %s", log); | |
1841 | else | |
1842 | retval = fn(log, sha1, 0, cb_data); | |
1843 | } | |
1844 | if (retval) | |
1845 | break; | |
1846 | } | |
1847 | free(log); | |
1848 | closedir(dir); | |
1849 | } | |
acb39f64 | 1850 | else if (*base) |
fcee5a14 | 1851 | return errno; |
eb8381c8 NP |
1852 | return retval; |
1853 | } | |
1854 | ||
1855 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
1856 | { | |
1857 | return do_for_each_reflog("", fn, cb_data); | |
1858 | } | |
3d9f037c CR |
1859 | |
1860 | int update_ref(const char *action, const char *refname, | |
1861 | const unsigned char *sha1, const unsigned char *oldval, | |
1862 | int flags, enum action_on_err onerr) | |
1863 | { | |
1864 | static struct ref_lock *lock; | |
1865 | lock = lock_any_ref_for_update(refname, oldval, flags); | |
1866 | if (!lock) { | |
1867 | const char *str = "Cannot lock the ref '%s'."; | |
1868 | switch (onerr) { | |
1869 | case MSG_ON_ERR: error(str, refname); break; | |
1870 | case DIE_ON_ERR: die(str, refname); break; | |
1871 | case QUIET_ON_ERR: break; | |
1872 | } | |
1873 | return 1; | |
1874 | } | |
1875 | if (write_ref_sha1(lock, sha1, action) < 0) { | |
1876 | const char *str = "Cannot update the ref '%s'."; | |
1877 | switch (onerr) { | |
1878 | case MSG_ON_ERR: error(str, refname); break; | |
1879 | case DIE_ON_ERR: die(str, refname); break; | |
1880 | case QUIET_ON_ERR: break; | |
1881 | } | |
1882 | return 1; | |
1883 | } | |
1884 | return 0; | |
1885 | } | |
cda69f48 | 1886 | |
2c5c66be | 1887 | int ref_exists(const char *refname) |
c17b2294 JH |
1888 | { |
1889 | unsigned char sha1[20]; | |
1890 | return !!resolve_ref(refname, sha1, 1, NULL); | |
1891 | } | |
1892 | ||
5483f799 | 1893 | struct ref *find_ref_by_name(const struct ref *list, const char *name) |
cda69f48 JK |
1894 | { |
1895 | for ( ; list; list = list->next) | |
1896 | if (!strcmp(list->name, name)) | |
5483f799 | 1897 | return (struct ref *)list; |
cda69f48 JK |
1898 | return NULL; |
1899 | } | |
7c2b3029 JK |
1900 | |
1901 | /* | |
1902 | * generate a format suitable for scanf from a ref_rev_parse_rules | |
1903 | * rule, that is replace the "%.*s" spec with a "%s" spec | |
1904 | */ | |
1905 | static void gen_scanf_fmt(char *scanf_fmt, const char *rule) | |
1906 | { | |
1907 | char *spec; | |
1908 | ||
1909 | spec = strstr(rule, "%.*s"); | |
1910 | if (!spec || strstr(spec + 4, "%.*s")) | |
1911 | die("invalid rule in ref_rev_parse_rules: %s", rule); | |
1912 | ||
1913 | /* copy all until spec */ | |
1914 | strncpy(scanf_fmt, rule, spec - rule); | |
1915 | scanf_fmt[spec - rule] = '\0'; | |
1916 | /* copy new spec */ | |
1917 | strcat(scanf_fmt, "%s"); | |
1918 | /* copy remaining rule */ | |
1919 | strcat(scanf_fmt, spec + 4); | |
1920 | ||
1921 | return; | |
1922 | } | |
1923 | ||
6e7b3309 | 1924 | char *shorten_unambiguous_ref(const char *ref, int strict) |
7c2b3029 JK |
1925 | { |
1926 | int i; | |
1927 | static char **scanf_fmts; | |
1928 | static int nr_rules; | |
1929 | char *short_name; | |
1930 | ||
1931 | /* pre generate scanf formats from ref_rev_parse_rules[] */ | |
1932 | if (!nr_rules) { | |
1933 | size_t total_len = 0; | |
1934 | ||
1935 | /* the rule list is NULL terminated, count them first */ | |
1936 | for (; ref_rev_parse_rules[nr_rules]; nr_rules++) | |
1937 | /* no +1 because strlen("%s") < strlen("%.*s") */ | |
1938 | total_len += strlen(ref_rev_parse_rules[nr_rules]); | |
1939 | ||
1940 | scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len); | |
1941 | ||
1942 | total_len = 0; | |
1943 | for (i = 0; i < nr_rules; i++) { | |
1944 | scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] | |
1945 | + total_len; | |
1946 | gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]); | |
1947 | total_len += strlen(ref_rev_parse_rules[i]); | |
1948 | } | |
1949 | } | |
1950 | ||
1951 | /* bail out if there are no rules */ | |
1952 | if (!nr_rules) | |
1953 | return xstrdup(ref); | |
1954 | ||
1955 | /* buffer for scanf result, at most ref must fit */ | |
1956 | short_name = xstrdup(ref); | |
1957 | ||
1958 | /* skip first rule, it will always match */ | |
1959 | for (i = nr_rules - 1; i > 0 ; --i) { | |
1960 | int j; | |
6e7b3309 | 1961 | int rules_to_fail = i; |
7c2b3029 JK |
1962 | int short_name_len; |
1963 | ||
1964 | if (1 != sscanf(ref, scanf_fmts[i], short_name)) | |
1965 | continue; | |
1966 | ||
1967 | short_name_len = strlen(short_name); | |
1968 | ||
6e7b3309 BW |
1969 | /* |
1970 | * in strict mode, all (except the matched one) rules | |
1971 | * must fail to resolve to a valid non-ambiguous ref | |
1972 | */ | |
1973 | if (strict) | |
1974 | rules_to_fail = nr_rules; | |
1975 | ||
7c2b3029 JK |
1976 | /* |
1977 | * check if the short name resolves to a valid ref, | |
1978 | * but use only rules prior to the matched one | |
1979 | */ | |
6e7b3309 | 1980 | for (j = 0; j < rules_to_fail; j++) { |
7c2b3029 JK |
1981 | const char *rule = ref_rev_parse_rules[j]; |
1982 | unsigned char short_objectname[20]; | |
1983 | char refname[PATH_MAX]; | |
1984 | ||
6e7b3309 BW |
1985 | /* skip matched rule */ |
1986 | if (i == j) | |
1987 | continue; | |
1988 | ||
7c2b3029 JK |
1989 | /* |
1990 | * the short name is ambiguous, if it resolves | |
1991 | * (with this previous rule) to a valid ref | |
1992 | * read_ref() returns 0 on success | |
1993 | */ | |
1994 | mksnpath(refname, sizeof(refname), | |
1995 | rule, short_name_len, short_name); | |
1996 | if (!read_ref(refname, short_objectname)) | |
1997 | break; | |
1998 | } | |
1999 | ||
2000 | /* | |
2001 | * short name is non-ambiguous if all previous rules | |
2002 | * haven't resolved to a valid ref | |
2003 | */ | |
6e7b3309 | 2004 | if (j == rules_to_fail) |
7c2b3029 JK |
2005 | return short_name; |
2006 | } | |
2007 | ||
2008 | free(short_name); | |
2009 | return xstrdup(ref); | |
2010 | } |