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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 | */ | |
4175e9e3 | 137 | static struct cached_refs { |
0e88c130 | 138 | struct cached_refs *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]; | |
0e88c130 MH |
145 | } *cached_refs; |
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 | ||
f130b116 | 161 | static void clear_cached_refs(struct cached_refs *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 | |
3ab24efe | 170 | static struct cached_refs *create_cached_refs(const char *submodule) |
e5dbf605 | 171 | { |
ce40979c | 172 | int len; |
e5dbf605 | 173 | struct cached_refs *refs; |
ce40979c MH |
174 | if (!submodule) |
175 | submodule = ""; | |
176 | len = strlen(submodule) + 1; | |
2c5c66be | 177 | refs = xcalloc(1, sizeof(struct cached_refs) + len); |
ce40979c | 178 | memcpy(refs->name, submodule, len); |
e5dbf605 MH |
179 | return refs; |
180 | } | |
181 | ||
4349a668 MH |
182 | /* |
183 | * Return a pointer to a cached_refs for the specified submodule. For | |
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 | */ | |
188 | static struct cached_refs *get_cached_refs(const char *submodule) | |
189 | { | |
0e88c130 MH |
190 | struct cached_refs *refs = cached_refs; |
191 | if (!submodule) | |
192 | submodule = ""; | |
193 | while (refs) { | |
194 | if (!strcmp(submodule, refs->name)) | |
195 | return refs; | |
196 | refs = refs->next; | |
4349a668 | 197 | } |
0e88c130 MH |
198 | |
199 | refs = create_cached_refs(submodule); | |
200 | refs->next = cached_refs; | |
201 | cached_refs = refs; | |
202 | return refs; | |
4349a668 MH |
203 | } |
204 | ||
f130b116 MH |
205 | static void invalidate_cached_refs(void) |
206 | { | |
0e88c130 MH |
207 | struct cached_refs *refs = cached_refs; |
208 | while (refs) { | |
209 | clear_cached_refs(refs); | |
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 | { |
4349a668 | 260 | struct cached_refs *refs = get_cached_refs(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 | { |
4349a668 | 382 | struct cached_refs *refs = get_cached_refs(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 | ||
e5fa45c1 JH |
396 | /* |
397 | * Called by resolve_gitlink_ref_recursive() after it failed to read | |
398 | * from "name", which is "module/.git/<refname>". Find <refname> in | |
399 | * the packed-refs file for the submodule. | |
400 | */ | |
0ebde32c LT |
401 | static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result) |
402 | { | |
e9c4c111 | 403 | int retval = -1; |
2c5c66be | 404 | struct ref_entry *ref; |
e5fa45c1 | 405 | struct ref_array *array; |
0ebde32c | 406 | |
e5fa45c1 JH |
407 | /* being defensive: resolve_gitlink_ref() did this for us */ |
408 | if (pathlen < 6 || memcmp(name + pathlen - 6, "/.git/", 6)) | |
409 | die("Oops"); | |
410 | name[pathlen - 6] = '\0'; /* make it path to the submodule */ | |
411 | array = get_packed_refs(name); | |
2c5c66be | 412 | ref = search_ref_array(array, refname); |
e9c4c111 JP |
413 | if (ref != NULL) { |
414 | memcpy(result, ref->sha1, 20); | |
415 | retval = 0; | |
0ebde32c | 416 | } |
0ebde32c LT |
417 | return retval; |
418 | } | |
419 | ||
420 | static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion) | |
421 | { | |
422 | int fd, len = strlen(refname); | |
423 | char buffer[128], *p; | |
424 | ||
425 | if (recursion > MAXDEPTH || len > MAXREFLEN) | |
426 | return -1; | |
427 | memcpy(name + pathlen, refname, len+1); | |
428 | fd = open(name, O_RDONLY); | |
429 | if (fd < 0) | |
430 | return resolve_gitlink_packed_ref(name, pathlen, refname, result); | |
431 | ||
432 | len = read(fd, buffer, sizeof(buffer)-1); | |
433 | close(fd); | |
434 | if (len < 0) | |
435 | return -1; | |
436 | while (len && isspace(buffer[len-1])) | |
437 | len--; | |
438 | buffer[len] = 0; | |
439 | ||
440 | /* Was it a detached head or an old-fashioned symlink? */ | |
441 | if (!get_sha1_hex(buffer, result)) | |
442 | return 0; | |
443 | ||
444 | /* Symref? */ | |
445 | if (strncmp(buffer, "ref:", 4)) | |
446 | return -1; | |
447 | p = buffer + 4; | |
448 | while (isspace(*p)) | |
449 | p++; | |
450 | ||
451 | return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1); | |
452 | } | |
453 | ||
454 | int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result) | |
455 | { | |
456 | int len = strlen(path), retval; | |
457 | char *gitdir; | |
842abf06 | 458 | const char *tmp; |
0ebde32c LT |
459 | |
460 | while (len && path[len-1] == '/') | |
461 | len--; | |
462 | if (!len) | |
463 | return -1; | |
464 | gitdir = xmalloc(len + MAXREFLEN + 8); | |
465 | memcpy(gitdir, path, len); | |
842abf06 LH |
466 | memcpy(gitdir + len, "/.git", 6); |
467 | len += 5; | |
468 | ||
13d6ec91 | 469 | tmp = read_gitfile(gitdir); |
842abf06 LH |
470 | if (tmp) { |
471 | free(gitdir); | |
472 | len = strlen(tmp); | |
473 | gitdir = xmalloc(len + MAXREFLEN + 3); | |
474 | memcpy(gitdir, tmp, len); | |
475 | } | |
476 | gitdir[len] = '/'; | |
477 | gitdir[++len] = '\0'; | |
478 | retval = resolve_gitlink_ref_recursive(gitdir, len, refname, result, 0); | |
0ebde32c LT |
479 | free(gitdir); |
480 | return retval; | |
481 | } | |
ca8db142 | 482 | |
4886b89f | 483 | /* |
c224ca7f MH |
484 | * Try to read ref from the packed references. On success, set sha1 |
485 | * and return 0; otherwise, return -1. | |
4886b89f | 486 | */ |
c224ca7f MH |
487 | static int get_packed_ref(const char *ref, unsigned char *sha1) |
488 | { | |
2c5c66be JH |
489 | struct ref_array *packed = get_packed_refs(NULL); |
490 | struct ref_entry *entry = search_ref_array(packed, ref); | |
491 | if (entry) { | |
492 | hashcpy(sha1, entry->sha1); | |
493 | return 0; | |
c224ca7f MH |
494 | } |
495 | return -1; | |
496 | } | |
497 | ||
8da19775 | 498 | const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 499 | { |
0104ca09 HO |
500 | int depth = MAXDEPTH; |
501 | ssize_t len; | |
a876ed83 | 502 | char buffer[256]; |
ed378ec7 | 503 | static char ref_buffer[256]; |
629cd3ac | 504 | char path[PATH_MAX]; |
ca8db142 | 505 | |
8da19775 JH |
506 | if (flag) |
507 | *flag = 0; | |
508 | ||
8384d788 MH |
509 | if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL)) |
510 | return NULL; | |
511 | ||
a876ed83 JH |
512 | for (;;) { |
513 | struct stat st; | |
514 | char *buf; | |
515 | int fd; | |
8a65ff76 | 516 | |
a876ed83 JH |
517 | if (--depth < 0) |
518 | return NULL; | |
ca8db142 | 519 | |
958a4789 | 520 | git_snpath(path, sizeof(path), "%s", ref); |
c224ca7f | 521 | |
a876ed83 | 522 | if (lstat(path, &st) < 0) { |
c224ca7f MH |
523 | if (errno != ENOENT) |
524 | return NULL; | |
525 | /* | |
526 | * The loose reference file does not exist; | |
527 | * check for a packed reference. | |
528 | */ | |
529 | if (!get_packed_ref(ref, sha1)) { | |
530 | if (flag) | |
531 | *flag |= REF_ISPACKED; | |
532 | return ref; | |
434cd0cd | 533 | } |
c224ca7f MH |
534 | /* The reference is not a packed reference, either. */ |
535 | if (reading) { | |
a876ed83 | 536 | return NULL; |
c224ca7f MH |
537 | } else { |
538 | hashclr(sha1); | |
539 | return ref; | |
540 | } | |
a876ed83 | 541 | } |
ca8db142 | 542 | |
a876ed83 JH |
543 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
544 | if (S_ISLNK(st.st_mode)) { | |
545 | len = readlink(path, buffer, sizeof(buffer)-1); | |
7bb2bf8e MH |
546 | if (len < 0) |
547 | return NULL; | |
b54cb795 | 548 | buffer[len] = 0; |
1f58a038 MH |
549 | if (!prefixcmp(buffer, "refs/") && |
550 | !check_refname_format(buffer, 0)) { | |
ed378ec7 LT |
551 | strcpy(ref_buffer, buffer); |
552 | ref = ref_buffer; | |
8da19775 JH |
553 | if (flag) |
554 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
555 | continue; |
556 | } | |
ca8db142 | 557 | } |
a876ed83 | 558 | |
7a21632f DS |
559 | /* Is it a directory? */ |
560 | if (S_ISDIR(st.st_mode)) { | |
561 | errno = EISDIR; | |
562 | return NULL; | |
563 | } | |
564 | ||
a876ed83 JH |
565 | /* |
566 | * Anything else, just open it and try to use it as | |
567 | * a ref | |
568 | */ | |
569 | fd = open(path, O_RDONLY); | |
570 | if (fd < 0) | |
571 | return NULL; | |
93d26e4c | 572 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
a876ed83 | 573 | close(fd); |
28775050 MH |
574 | if (len < 0) |
575 | return NULL; | |
576 | while (len && isspace(buffer[len-1])) | |
577 | len--; | |
578 | buffer[len] = '\0'; | |
a876ed83 JH |
579 | |
580 | /* | |
581 | * Is it a symbolic ref? | |
582 | */ | |
28775050 | 583 | if (prefixcmp(buffer, "ref:")) |
a876ed83 JH |
584 | break; |
585 | buf = buffer + 4; | |
28775050 MH |
586 | while (isspace(*buf)) |
587 | buf++; | |
313fb010 MH |
588 | if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) { |
589 | warning("symbolic reference in %s is formatted incorrectly", | |
590 | path); | |
591 | return NULL; | |
592 | } | |
28775050 | 593 | ref = strcpy(ref_buffer, buf); |
8da19775 JH |
594 | if (flag) |
595 | *flag |= REF_ISSYMREF; | |
8a65ff76 | 596 | } |
f989fea0 MH |
597 | /* Please note that FETCH_HEAD has a second line containing other data. */ |
598 | if (get_sha1_hex(buffer, sha1) || (buffer[40] != '\0' && !isspace(buffer[40]))) { | |
629cd3ac | 599 | warning("reference in %s is formatted incorrectly", path); |
a876ed83 | 600 | return NULL; |
629cd3ac | 601 | } |
ed378ec7 | 602 | return ref; |
a876ed83 JH |
603 | } |
604 | ||
d08bae7e IL |
605 | /* The argument to filter_refs */ |
606 | struct ref_filter { | |
607 | const char *pattern; | |
608 | each_ref_fn *fn; | |
609 | void *cb_data; | |
610 | }; | |
611 | ||
ed378ec7 | 612 | int read_ref(const char *ref, unsigned char *sha1) |
a876ed83 | 613 | { |
8da19775 | 614 | if (resolve_ref(ref, sha1, 1, NULL)) |
a876ed83 JH |
615 | return 0; |
616 | return -1; | |
8a65ff76 LT |
617 | } |
618 | ||
f8948e2f | 619 | #define DO_FOR_EACH_INCLUDE_BROKEN 01 |
ef06b918 | 620 | static int do_one_ref(const char *base, each_ref_fn fn, int trim, |
e9c4c111 | 621 | int flags, void *cb_data, struct ref_entry *entry) |
ef06b918 | 622 | { |
b3cfc406 | 623 | if (prefixcmp(entry->name, base)) |
ef06b918 | 624 | return 0; |
e01de1c9 | 625 | |
f8948e2f | 626 | if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) { |
e01de1c9 JH |
627 | if (entry->flag & REF_BROKEN) |
628 | return 0; /* ignore dangling symref */ | |
f8948e2f JH |
629 | if (!has_sha1_file(entry->sha1)) { |
630 | error("%s does not point to a valid object!", entry->name); | |
631 | return 0; | |
632 | } | |
ef06b918 | 633 | } |
0ae91be0 | 634 | current_ref = entry; |
ef06b918 JH |
635 | return fn(entry->name + trim, entry->sha1, entry->flag, cb_data); |
636 | } | |
637 | ||
d08bae7e IL |
638 | static int filter_refs(const char *ref, const unsigned char *sha, int flags, |
639 | void *data) | |
640 | { | |
641 | struct ref_filter *filter = (struct ref_filter *)data; | |
642 | if (fnmatch(filter->pattern, ref, 0)) | |
643 | return 0; | |
644 | return filter->fn(ref, sha, flags, filter->cb_data); | |
645 | } | |
646 | ||
cf0adba7 JH |
647 | int peel_ref(const char *ref, unsigned char *sha1) |
648 | { | |
649 | int flag; | |
650 | unsigned char base[20]; | |
651 | struct object *o; | |
652 | ||
0ae91be0 SP |
653 | if (current_ref && (current_ref->name == ref |
654 | || !strcmp(current_ref->name, ref))) { | |
655 | if (current_ref->flag & REF_KNOWS_PEELED) { | |
656 | hashcpy(sha1, current_ref->peeled); | |
657 | return 0; | |
658 | } | |
659 | hashcpy(base, current_ref->sha1); | |
660 | goto fallback; | |
661 | } | |
662 | ||
cf0adba7 JH |
663 | if (!resolve_ref(ref, base, 1, &flag)) |
664 | return -1; | |
665 | ||
666 | if ((flag & REF_ISPACKED)) { | |
e9c4c111 JP |
667 | struct ref_array *array = get_packed_refs(NULL); |
668 | struct ref_entry *r = search_ref_array(array, ref); | |
cf0adba7 | 669 | |
e9c4c111 JP |
670 | if (r != NULL && r->flag & REF_KNOWS_PEELED) { |
671 | hashcpy(sha1, r->peeled); | |
672 | return 0; | |
cf0adba7 | 673 | } |
cf0adba7 JH |
674 | } |
675 | ||
0ae91be0 | 676 | fallback: |
cf0adba7 | 677 | o = parse_object(base); |
8c87dc77 | 678 | if (o && o->type == OBJ_TAG) { |
cf0adba7 JH |
679 | o = deref_tag(o, ref, 0); |
680 | if (o) { | |
681 | hashcpy(sha1, o->sha1); | |
682 | return 0; | |
683 | } | |
684 | } | |
685 | return -1; | |
686 | } | |
687 | ||
0bad611b HV |
688 | static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn, |
689 | int trim, int flags, void *cb_data) | |
8a65ff76 | 690 | { |
e9c4c111 JP |
691 | int retval = 0, i, p = 0, l = 0; |
692 | struct ref_array *packed = get_packed_refs(submodule); | |
693 | struct ref_array *loose = get_loose_refs(submodule); | |
8a65ff76 | 694 | |
e9c4c111 | 695 | struct ref_array *extra = &extra_refs; |
e142a3c6 | 696 | |
e9c4c111 JP |
697 | for (i = 0; i < extra->nr; i++) |
698 | retval = do_one_ref(base, fn, trim, flags, cb_data, extra->refs[i]); | |
e142a3c6 | 699 | |
e9c4c111 JP |
700 | while (p < packed->nr && l < loose->nr) { |
701 | struct ref_entry *entry; | |
702 | int cmp = strcmp(packed->refs[p]->name, loose->refs[l]->name); | |
e1e22e37 | 703 | if (!cmp) { |
e9c4c111 | 704 | p++; |
e1e22e37 | 705 | continue; |
6cada6a9 | 706 | } |
e1e22e37 | 707 | if (cmp > 0) { |
e9c4c111 | 708 | entry = loose->refs[l++]; |
e1e22e37 | 709 | } else { |
e9c4c111 | 710 | entry = packed->refs[p++]; |
e1e22e37 | 711 | } |
f8948e2f | 712 | retval = do_one_ref(base, fn, trim, flags, cb_data, entry); |
e1e22e37 | 713 | if (retval) |
0ae91be0 | 714 | goto end_each; |
e1e22e37 | 715 | } |
8a65ff76 | 716 | |
e9c4c111 JP |
717 | if (l < loose->nr) { |
718 | p = l; | |
719 | packed = loose; | |
720 | } | |
721 | ||
722 | for (; p < packed->nr; p++) { | |
723 | retval = do_one_ref(base, fn, trim, flags, cb_data, packed->refs[p]); | |
ef06b918 | 724 | if (retval) |
0ae91be0 | 725 | goto end_each; |
8a65ff76 | 726 | } |
0ae91be0 SP |
727 | |
728 | end_each: | |
729 | current_ref = NULL; | |
730 | return retval; | |
8a65ff76 LT |
731 | } |
732 | ||
0bad611b HV |
733 | |
734 | static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data) | |
723c31fe LT |
735 | { |
736 | unsigned char sha1[20]; | |
8da19775 JH |
737 | int flag; |
738 | ||
0bad611b HV |
739 | if (submodule) { |
740 | if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0) | |
741 | return fn("HEAD", sha1, 0, cb_data); | |
742 | ||
743 | return 0; | |
744 | } | |
745 | ||
8da19775 JH |
746 | if (resolve_ref("HEAD", sha1, 1, &flag)) |
747 | return fn("HEAD", sha1, flag, cb_data); | |
0bad611b | 748 | |
2f34ba32 | 749 | return 0; |
723c31fe LT |
750 | } |
751 | ||
0bad611b HV |
752 | int head_ref(each_ref_fn fn, void *cb_data) |
753 | { | |
754 | return do_head_ref(NULL, fn, cb_data); | |
755 | } | |
756 | ||
9ef6aeb0 HV |
757 | int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
758 | { | |
759 | return do_head_ref(submodule, fn, cb_data); | |
760 | } | |
761 | ||
cb5d709f | 762 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 763 | { |
b3cfc406 | 764 | return do_for_each_ref(NULL, "", fn, 0, 0, cb_data); |
a62be77f SE |
765 | } |
766 | ||
9ef6aeb0 HV |
767 | int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
768 | { | |
b3cfc406 | 769 | return do_for_each_ref(submodule, "", fn, 0, 0, cb_data); |
a62be77f SE |
770 | } |
771 | ||
2a8177b6 CC |
772 | int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data) |
773 | { | |
0bad611b | 774 | return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data); |
2a8177b6 CC |
775 | } |
776 | ||
9ef6aeb0 HV |
777 | int for_each_ref_in_submodule(const char *submodule, const char *prefix, |
778 | each_ref_fn fn, void *cb_data) | |
779 | { | |
780 | return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data); | |
2a8177b6 CC |
781 | } |
782 | ||
cb5d709f | 783 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 784 | { |
2a8177b6 | 785 | return for_each_ref_in("refs/tags/", fn, cb_data); |
a62be77f SE |
786 | } |
787 | ||
9ef6aeb0 HV |
788 | int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
789 | { | |
790 | return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data); | |
791 | } | |
792 | ||
cb5d709f | 793 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 794 | { |
2a8177b6 | 795 | return for_each_ref_in("refs/heads/", fn, cb_data); |
a62be77f SE |
796 | } |
797 | ||
9ef6aeb0 HV |
798 | int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
799 | { | |
800 | return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data); | |
801 | } | |
802 | ||
cb5d709f | 803 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 804 | { |
2a8177b6 | 805 | return for_each_ref_in("refs/remotes/", fn, cb_data); |
f8948e2f JH |
806 | } |
807 | ||
9ef6aeb0 HV |
808 | int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
809 | { | |
810 | return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data); | |
811 | } | |
812 | ||
29268700 CC |
813 | int for_each_replace_ref(each_ref_fn fn, void *cb_data) |
814 | { | |
0bad611b | 815 | return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data); |
29268700 CC |
816 | } |
817 | ||
a1bea2c1 JT |
818 | int head_ref_namespaced(each_ref_fn fn, void *cb_data) |
819 | { | |
820 | struct strbuf buf = STRBUF_INIT; | |
821 | int ret = 0; | |
822 | unsigned char sha1[20]; | |
823 | int flag; | |
824 | ||
825 | strbuf_addf(&buf, "%sHEAD", get_git_namespace()); | |
826 | if (resolve_ref(buf.buf, sha1, 1, &flag)) | |
827 | ret = fn(buf.buf, sha1, flag, cb_data); | |
828 | strbuf_release(&buf); | |
829 | ||
830 | return ret; | |
831 | } | |
832 | ||
833 | int for_each_namespaced_ref(each_ref_fn fn, void *cb_data) | |
834 | { | |
835 | struct strbuf buf = STRBUF_INIT; | |
836 | int ret; | |
837 | strbuf_addf(&buf, "%srefs/", get_git_namespace()); | |
838 | ret = do_for_each_ref(NULL, buf.buf, fn, 0, 0, cb_data); | |
839 | strbuf_release(&buf); | |
840 | return ret; | |
841 | } | |
842 | ||
b09fe971 IL |
843 | int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, |
844 | const char *prefix, void *cb_data) | |
d08bae7e IL |
845 | { |
846 | struct strbuf real_pattern = STRBUF_INIT; | |
847 | struct ref_filter filter; | |
d08bae7e IL |
848 | int ret; |
849 | ||
b09fe971 | 850 | if (!prefix && prefixcmp(pattern, "refs/")) |
d08bae7e | 851 | strbuf_addstr(&real_pattern, "refs/"); |
b09fe971 IL |
852 | else if (prefix) |
853 | strbuf_addstr(&real_pattern, prefix); | |
d08bae7e IL |
854 | strbuf_addstr(&real_pattern, pattern); |
855 | ||
894a9d33 | 856 | if (!has_glob_specials(pattern)) { |
9517e6b8 | 857 | /* Append implied '/' '*' if not present. */ |
d08bae7e IL |
858 | if (real_pattern.buf[real_pattern.len - 1] != '/') |
859 | strbuf_addch(&real_pattern, '/'); | |
860 | /* No need to check for '*', there is none. */ | |
861 | strbuf_addch(&real_pattern, '*'); | |
862 | } | |
863 | ||
864 | filter.pattern = real_pattern.buf; | |
865 | filter.fn = fn; | |
866 | filter.cb_data = cb_data; | |
867 | ret = for_each_ref(filter_refs, &filter); | |
868 | ||
869 | strbuf_release(&real_pattern); | |
870 | return ret; | |
871 | } | |
872 | ||
b09fe971 IL |
873 | int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data) |
874 | { | |
875 | return for_each_glob_ref_in(fn, pattern, NULL, cb_data); | |
876 | } | |
877 | ||
f8948e2f JH |
878 | int for_each_rawref(each_ref_fn fn, void *cb_data) |
879 | { | |
b3cfc406 | 880 | return do_for_each_ref(NULL, "", fn, 0, |
f8948e2f | 881 | DO_FOR_EACH_INCLUDE_BROKEN, cb_data); |
8a65ff76 LT |
882 | } |
883 | ||
03feddd6 JH |
884 | /* |
885 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
886 | * We do not like it if: | |
887 | * | |
888 | * - any path component of it begins with ".", or | |
889 | * - it has double dots "..", or | |
890 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
891 | * - it ends with a "/". | |
3e262b95 | 892 | * - it ends with ".lock" |
a4c2e699 | 893 | * - it contains a "\" (backslash) |
03feddd6 JH |
894 | */ |
895 | ||
9224b73b | 896 | /* Return true iff ch is not allowed in reference names. */ |
03feddd6 JH |
897 | static inline int bad_ref_char(int ch) |
898 | { | |
f3738c1c | 899 | if (((unsigned) ch) <= ' ' || ch == 0x7f || |
a4c2e699 | 900 | ch == '~' || ch == '^' || ch == ':' || ch == '\\') |
8558fd9e DB |
901 | return 1; |
902 | /* 2.13 Pattern Matching Notation */ | |
9224b73b | 903 | if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */ |
8558fd9e | 904 | return 1; |
8558fd9e | 905 | return 0; |
03feddd6 JH |
906 | } |
907 | ||
49295d4e MH |
908 | /* |
909 | * Try to read one refname component from the front of ref. Return | |
910 | * the length of the component found, or -1 if the component is not | |
911 | * legal. | |
912 | */ | |
dce4bab6 | 913 | static int check_refname_component(const char *ref, int flags) |
95fc7512 | 914 | { |
49295d4e MH |
915 | const char *cp; |
916 | char last = '\0'; | |
03feddd6 | 917 | |
49295d4e MH |
918 | for (cp = ref; ; cp++) { |
919 | char ch = *cp; | |
920 | if (ch == '\0' || ch == '/') | |
921 | break; | |
922 | if (bad_ref_char(ch)) | |
923 | return -1; /* Illegal character in refname. */ | |
924 | if (last == '.' && ch == '.') | |
925 | return -1; /* Refname contains "..". */ | |
926 | if (last == '@' && ch == '{') | |
927 | return -1; /* Refname contains "@{". */ | |
cbdffe40 | 928 | last = ch; |
49295d4e MH |
929 | } |
930 | if (cp == ref) | |
931 | return -1; /* Component has zero length. */ | |
dce4bab6 MH |
932 | if (ref[0] == '.') { |
933 | if (!(flags & REFNAME_DOT_COMPONENT)) | |
934 | return -1; /* Component starts with '.'. */ | |
935 | /* | |
936 | * Even if leading dots are allowed, don't allow "." | |
937 | * as a component (".." is prevented by a rule above). | |
938 | */ | |
939 | if (ref[1] == '\0') | |
940 | return -1; /* Component equals ".". */ | |
941 | } | |
7e9d2fe9 MH |
942 | if (cp - ref >= 5 && !memcmp(cp - 5, ".lock", 5)) |
943 | return -1; /* Refname ends with ".lock". */ | |
49295d4e MH |
944 | return cp - ref; |
945 | } | |
946 | ||
8d9c5010 | 947 | int check_refname_format(const char *ref, int flags) |
95fc7512 | 948 | { |
49295d4e | 949 | int component_len, component_count = 0; |
03feddd6 | 950 | |
03feddd6 | 951 | while (1) { |
49295d4e | 952 | /* We are at the start of a path component. */ |
dce4bab6 | 953 | component_len = check_refname_component(ref, flags); |
49295d4e MH |
954 | if (component_len < 0) { |
955 | if ((flags & REFNAME_REFSPEC_PATTERN) && | |
956 | ref[0] == '*' && | |
957 | (ref[1] == '\0' || ref[1] == '/')) { | |
8d9c5010 MH |
958 | /* Accept one wildcard as a full refname component. */ |
959 | flags &= ~REFNAME_REFSPEC_PATTERN; | |
49295d4e MH |
960 | component_len = 1; |
961 | } else { | |
8d9c5010 | 962 | return -1; |
49295d4e | 963 | } |
03feddd6 | 964 | } |
49295d4e MH |
965 | component_count++; |
966 | if (ref[component_len] == '\0') | |
967 | break; | |
968 | /* Skip to next component. */ | |
969 | ref += component_len + 1; | |
03feddd6 | 970 | } |
49295d4e MH |
971 | |
972 | if (ref[component_len - 1] == '.') | |
973 | return -1; /* Refname ends with '.'. */ | |
49295d4e MH |
974 | if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2) |
975 | return -1; /* Refname has only one component. */ | |
976 | return 0; | |
95fc7512 DB |
977 | } |
978 | ||
4577e483 | 979 | const char *prettify_refname(const char *name) |
a9c37a72 | 980 | { |
a9c37a72 DB |
981 | return name + ( |
982 | !prefixcmp(name, "refs/heads/") ? 11 : | |
983 | !prefixcmp(name, "refs/tags/") ? 10 : | |
984 | !prefixcmp(name, "refs/remotes/") ? 13 : | |
985 | 0); | |
986 | } | |
987 | ||
79803322 SP |
988 | const char *ref_rev_parse_rules[] = { |
989 | "%.*s", | |
990 | "refs/%.*s", | |
991 | "refs/tags/%.*s", | |
992 | "refs/heads/%.*s", | |
993 | "refs/remotes/%.*s", | |
994 | "refs/remotes/%.*s/HEAD", | |
995 | NULL | |
996 | }; | |
997 | ||
605b4978 SP |
998 | const char *ref_fetch_rules[] = { |
999 | "%.*s", | |
1000 | "refs/%.*s", | |
1001 | "refs/heads/%.*s", | |
1002 | NULL | |
1003 | }; | |
1004 | ||
79803322 SP |
1005 | int refname_match(const char *abbrev_name, const char *full_name, const char **rules) |
1006 | { | |
1007 | const char **p; | |
1008 | const int abbrev_name_len = strlen(abbrev_name); | |
1009 | ||
1010 | for (p = rules; *p; p++) { | |
1011 | if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { | |
1012 | return 1; | |
1013 | } | |
1014 | } | |
1015 | ||
1016 | return 0; | |
1017 | } | |
1018 | ||
e5f38ec3 | 1019 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
1020 | const unsigned char *old_sha1, int mustexist) |
1021 | { | |
8da19775 | 1022 | if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 1023 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
1024 | unlock_ref(lock); |
1025 | return NULL; | |
1026 | } | |
a89fccd2 | 1027 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 1028 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
1029 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
1030 | unlock_ref(lock); | |
1031 | return NULL; | |
1032 | } | |
1033 | return lock; | |
1034 | } | |
1035 | ||
7155b727 | 1036 | static int remove_empty_directories(const char *file) |
bc7127ef JH |
1037 | { |
1038 | /* we want to create a file but there is a directory there; | |
1039 | * if that is an empty directory (or a directory that contains | |
1040 | * only empty directories), remove them. | |
1041 | */ | |
7155b727 JS |
1042 | struct strbuf path; |
1043 | int result; | |
bc7127ef | 1044 | |
7155b727 JS |
1045 | strbuf_init(&path, 20); |
1046 | strbuf_addstr(&path, file); | |
1047 | ||
a0f4afbe | 1048 | result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY); |
7155b727 JS |
1049 | |
1050 | strbuf_release(&path); | |
1051 | ||
1052 | return result; | |
bc7127ef JH |
1053 | } |
1054 | ||
c976d415 | 1055 | static int is_refname_available(const char *ref, const char *oldref, |
e9c4c111 | 1056 | struct ref_array *array, int quiet) |
c976d415 | 1057 | { |
e9c4c111 JP |
1058 | int i, namlen = strlen(ref); /* e.g. 'foo/bar' */ |
1059 | for (i = 0; i < array->nr; i++ ) { | |
1060 | struct ref_entry *entry = array->refs[i]; | |
1061 | /* entry->name could be 'foo' or 'foo/bar/baz' */ | |
1062 | if (!oldref || strcmp(oldref, entry->name)) { | |
1063 | int len = strlen(entry->name); | |
c976d415 | 1064 | int cmplen = (namlen < len) ? namlen : len; |
e9c4c111 JP |
1065 | const char *lead = (namlen < len) ? entry->name : ref; |
1066 | if (!strncmp(ref, entry->name, cmplen) && | |
c976d415 LH |
1067 | lead[cmplen] == '/') { |
1068 | if (!quiet) | |
1069 | error("'%s' exists; cannot create '%s'", | |
e9c4c111 | 1070 | entry->name, ref); |
c976d415 LH |
1071 | return 0; |
1072 | } | |
1073 | } | |
c976d415 LH |
1074 | } |
1075 | return 1; | |
1076 | } | |
1077 | ||
68db31cc | 1078 | static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p) |
4bd18c43 | 1079 | { |
434cd0cd | 1080 | char *ref_file; |
ed378ec7 | 1081 | const char *orig_ref = ref; |
4bd18c43 | 1082 | struct ref_lock *lock; |
5cc3cef9 | 1083 | int last_errno = 0; |
acd3b9ec | 1084 | int type, lflags; |
4431fcc4 | 1085 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
5bdd8d4a | 1086 | int missing = 0; |
4bd18c43 SP |
1087 | |
1088 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
1089 | lock->lock_fd = -1; | |
1090 | ||
68db31cc | 1091 | ref = resolve_ref(ref, lock->old_sha1, mustexist, &type); |
bc7127ef JH |
1092 | if (!ref && errno == EISDIR) { |
1093 | /* we are trying to lock foo but we used to | |
1094 | * have foo/bar which now does not exist; | |
1095 | * it is normal for the empty directory 'foo' | |
1096 | * to remain. | |
1097 | */ | |
1098 | ref_file = git_path("%s", orig_ref); | |
5cc3cef9 JH |
1099 | if (remove_empty_directories(ref_file)) { |
1100 | last_errno = errno; | |
1101 | error("there are still refs under '%s'", orig_ref); | |
1102 | goto error_return; | |
1103 | } | |
68db31cc | 1104 | ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type); |
bc7127ef | 1105 | } |
68db31cc SV |
1106 | if (type_p) |
1107 | *type_p = type; | |
ed378ec7 | 1108 | if (!ref) { |
5cc3cef9 | 1109 | last_errno = errno; |
818f477c | 1110 | error("unable to resolve reference %s: %s", |
ed378ec7 | 1111 | orig_ref, strerror(errno)); |
5cc3cef9 | 1112 | goto error_return; |
4bd18c43 | 1113 | } |
5bdd8d4a | 1114 | missing = is_null_sha1(lock->old_sha1); |
c976d415 LH |
1115 | /* When the ref did not exist and we are creating it, |
1116 | * make sure there is no existing ref that is packed | |
1117 | * whose name begins with our refname, nor a ref whose | |
1118 | * name is a proper prefix of our refname. | |
1119 | */ | |
5bdd8d4a | 1120 | if (missing && |
0bad611b | 1121 | !is_refname_available(ref, NULL, get_packed_refs(NULL), 0)) { |
f475e08e | 1122 | last_errno = ENOTDIR; |
c976d415 | 1123 | goto error_return; |
f475e08e | 1124 | } |
22a3844e | 1125 | |
c33d5174 | 1126 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 1127 | |
acd3b9ec JH |
1128 | lflags = LOCK_DIE_ON_ERROR; |
1129 | if (flags & REF_NODEREF) { | |
68db31cc | 1130 | ref = orig_ref; |
acd3b9ec JH |
1131 | lflags |= LOCK_NODEREF; |
1132 | } | |
434cd0cd | 1133 | lock->ref_name = xstrdup(ref); |
1655707c | 1134 | lock->orig_ref_name = xstrdup(orig_ref); |
7c1a278d | 1135 | ref_file = git_path("%s", ref); |
5bdd8d4a | 1136 | if (missing) |
68db31cc SV |
1137 | lock->force_write = 1; |
1138 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
1139 | lock->force_write = 1; | |
4bd18c43 | 1140 | |
5cc3cef9 JH |
1141 | if (safe_create_leading_directories(ref_file)) { |
1142 | last_errno = errno; | |
1143 | error("unable to create directory for %s", ref_file); | |
1144 | goto error_return; | |
1145 | } | |
4bd18c43 | 1146 | |
acd3b9ec | 1147 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags); |
4bd18c43 | 1148 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; |
5cc3cef9 JH |
1149 | |
1150 | error_return: | |
1151 | unlock_ref(lock); | |
1152 | errno = last_errno; | |
1153 | return NULL; | |
4bd18c43 SP |
1154 | } |
1155 | ||
4431fcc4 | 1156 | struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1) |
95fc7512 | 1157 | { |
53cce84c | 1158 | char refpath[PATH_MAX]; |
8d9c5010 | 1159 | if (check_refname_format(ref, 0)) |
4bd18c43 | 1160 | return NULL; |
53cce84c | 1161 | strcpy(refpath, mkpath("refs/%s", ref)); |
68db31cc | 1162 | return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL); |
4bd18c43 SP |
1163 | } |
1164 | ||
68db31cc | 1165 | struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags) |
4bd18c43 | 1166 | { |
8d9c5010 | 1167 | if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL)) |
257f3020 | 1168 | return NULL; |
8d9c5010 | 1169 | return lock_ref_sha1_basic(ref, old_sha1, flags, NULL); |
c0277d15 JH |
1170 | } |
1171 | ||
26a063a1 JH |
1172 | static struct lock_file packlock; |
1173 | ||
c0277d15 JH |
1174 | static int repack_without_ref(const char *refname) |
1175 | { | |
e9c4c111 JP |
1176 | struct ref_array *packed; |
1177 | struct ref_entry *ref; | |
1178 | int fd, i; | |
c0277d15 | 1179 | |
e9c4c111 JP |
1180 | packed = get_packed_refs(NULL); |
1181 | ref = search_ref_array(packed, refname); | |
1182 | if (ref == NULL) | |
c0277d15 | 1183 | return 0; |
c0277d15 | 1184 | fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0); |
1b018fd9 MV |
1185 | if (fd < 0) { |
1186 | unable_to_lock_error(git_path("packed-refs"), errno); | |
c0277d15 | 1187 | return error("cannot delete '%s' from packed refs", refname); |
1b018fd9 | 1188 | } |
c0277d15 | 1189 | |
e9c4c111 | 1190 | for (i = 0; i < packed->nr; i++) { |
c0277d15 JH |
1191 | char line[PATH_MAX + 100]; |
1192 | int len; | |
1193 | ||
e9c4c111 JP |
1194 | ref = packed->refs[i]; |
1195 | ||
1196 | if (!strcmp(refname, ref->name)) | |
c0277d15 JH |
1197 | continue; |
1198 | len = snprintf(line, sizeof(line), "%s %s\n", | |
e9c4c111 | 1199 | sha1_to_hex(ref->sha1), ref->name); |
c0277d15 JH |
1200 | /* this should not happen but just being defensive */ |
1201 | if (len > sizeof(line)) | |
e9c4c111 | 1202 | die("too long a refname '%s'", ref->name); |
c0277d15 JH |
1203 | write_or_die(fd, line, len); |
1204 | } | |
1205 | return commit_lock_file(&packlock); | |
1206 | } | |
1207 | ||
eca35a25 | 1208 | int delete_ref(const char *refname, const unsigned char *sha1, int delopt) |
c0277d15 JH |
1209 | { |
1210 | struct ref_lock *lock; | |
eca35a25 | 1211 | int err, i = 0, ret = 0, flag = 0; |
c0277d15 | 1212 | |
68db31cc | 1213 | lock = lock_ref_sha1_basic(refname, sha1, 0, &flag); |
c0277d15 JH |
1214 | if (!lock) |
1215 | return 1; | |
045a476f | 1216 | if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) { |
c0277d15 | 1217 | /* loose */ |
eca35a25 MV |
1218 | const char *path; |
1219 | ||
1220 | if (!(delopt & REF_NODEREF)) { | |
1221 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
1222 | lock->lk->filename[i] = 0; | |
1223 | path = lock->lk->filename; | |
1224 | } else { | |
9db56f71 | 1225 | path = git_path("%s", refname); |
eca35a25 | 1226 | } |
691f1a28 AR |
1227 | err = unlink_or_warn(path); |
1228 | if (err && errno != ENOENT) | |
c0277d15 | 1229 | ret = 1; |
691f1a28 | 1230 | |
eca35a25 MV |
1231 | if (!(delopt & REF_NODEREF)) |
1232 | lock->lk->filename[i] = '.'; | |
c0277d15 JH |
1233 | } |
1234 | /* removing the loose one could have resurrected an earlier | |
1235 | * packed one. Also, if it was not loose we need to repack | |
1236 | * without it. | |
1237 | */ | |
1238 | ret |= repack_without_ref(refname); | |
1239 | ||
691f1a28 | 1240 | unlink_or_warn(git_path("logs/%s", lock->ref_name)); |
c0277d15 JH |
1241 | invalidate_cached_refs(); |
1242 | unlock_ref(lock); | |
1243 | return ret; | |
4bd18c43 SP |
1244 | } |
1245 | ||
765c2258 PH |
1246 | /* |
1247 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
1248 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
1249 | * | |
1250 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
1251 | * live into logs/refs. | |
1252 | */ | |
1253 | #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log" | |
1254 | ||
678d0f4c | 1255 | int rename_ref(const char *oldref, const char *newref, const char *logmsg) |
c976d415 LH |
1256 | { |
1257 | static const char renamed_ref[] = "RENAMED-REF"; | |
1258 | unsigned char sha1[20], orig_sha1[20]; | |
1259 | int flag = 0, logmoved = 0; | |
1260 | struct ref_lock *lock; | |
c976d415 | 1261 | struct stat loginfo; |
16c2bfbb | 1262 | int log = !lstat(git_path("logs/%s", oldref), &loginfo); |
eca35a25 | 1263 | const char *symref = NULL; |
c976d415 | 1264 | |
450d4c0f | 1265 | if (log && S_ISLNK(loginfo.st_mode)) |
c976d415 LH |
1266 | return error("reflog for %s is a symlink", oldref); |
1267 | ||
eca35a25 MV |
1268 | symref = resolve_ref(oldref, orig_sha1, 1, &flag); |
1269 | if (flag & REF_ISSYMREF) | |
fa58186c MV |
1270 | return error("refname %s is a symbolic ref, renaming it is not supported", |
1271 | oldref); | |
eca35a25 | 1272 | if (!symref) |
c976d415 LH |
1273 | return error("refname %s not found", oldref); |
1274 | ||
0bad611b | 1275 | if (!is_refname_available(newref, oldref, get_packed_refs(NULL), 0)) |
c976d415 LH |
1276 | return 1; |
1277 | ||
0bad611b | 1278 | if (!is_refname_available(newref, oldref, get_loose_refs(NULL), 0)) |
c976d415 LH |
1279 | return 1; |
1280 | ||
68db31cc | 1281 | lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL); |
c976d415 LH |
1282 | if (!lock) |
1283 | return error("unable to lock %s", renamed_ref); | |
1284 | lock->force_write = 1; | |
678d0f4c | 1285 | if (write_ref_sha1(lock, orig_sha1, logmsg)) |
c976d415 LH |
1286 | return error("unable to save current sha1 in %s", renamed_ref); |
1287 | ||
765c2258 PH |
1288 | if (log && rename(git_path("logs/%s", oldref), git_path(TMP_RENAMED_LOG))) |
1289 | return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s", | |
c976d415 LH |
1290 | oldref, strerror(errno)); |
1291 | ||
eca35a25 | 1292 | if (delete_ref(oldref, orig_sha1, REF_NODEREF)) { |
c976d415 LH |
1293 | error("unable to delete old %s", oldref); |
1294 | goto rollback; | |
1295 | } | |
1296 | ||
eca35a25 | 1297 | if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1, REF_NODEREF)) { |
c976d415 LH |
1298 | if (errno==EISDIR) { |
1299 | if (remove_empty_directories(git_path("%s", newref))) { | |
1300 | error("Directory not empty: %s", newref); | |
1301 | goto rollback; | |
1302 | } | |
1303 | } else { | |
1304 | error("unable to delete existing %s", newref); | |
1305 | goto rollback; | |
1306 | } | |
1307 | } | |
1308 | ||
1309 | if (log && safe_create_leading_directories(git_path("logs/%s", newref))) { | |
1310 | error("unable to create directory for %s", newref); | |
1311 | goto rollback; | |
1312 | } | |
1313 | ||
1314 | retry: | |
765c2258 | 1315 | if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newref))) { |
d9e74d57 JR |
1316 | if (errno==EISDIR || errno==ENOTDIR) { |
1317 | /* | |
1318 | * rename(a, b) when b is an existing | |
1319 | * directory ought to result in ISDIR, but | |
1320 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
1321 | */ | |
c976d415 LH |
1322 | if (remove_empty_directories(git_path("logs/%s", newref))) { |
1323 | error("Directory not empty: logs/%s", newref); | |
1324 | goto rollback; | |
1325 | } | |
1326 | goto retry; | |
1327 | } else { | |
765c2258 | 1328 | error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s", |
c976d415 LH |
1329 | newref, strerror(errno)); |
1330 | goto rollback; | |
1331 | } | |
1332 | } | |
1333 | logmoved = log; | |
1334 | ||
68db31cc | 1335 | lock = lock_ref_sha1_basic(newref, NULL, 0, NULL); |
c976d415 LH |
1336 | if (!lock) { |
1337 | error("unable to lock %s for update", newref); | |
1338 | goto rollback; | |
1339 | } | |
c976d415 LH |
1340 | lock->force_write = 1; |
1341 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 1342 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
c976d415 LH |
1343 | error("unable to write current sha1 into %s", newref); |
1344 | goto rollback; | |
1345 | } | |
1346 | ||
1347 | return 0; | |
1348 | ||
1349 | rollback: | |
68db31cc | 1350 | lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL); |
c976d415 LH |
1351 | if (!lock) { |
1352 | error("unable to lock %s for rollback", oldref); | |
1353 | goto rollbacklog; | |
1354 | } | |
1355 | ||
1356 | lock->force_write = 1; | |
1357 | flag = log_all_ref_updates; | |
1358 | log_all_ref_updates = 0; | |
1359 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
1360 | error("unable to write current sha1 into %s", oldref); | |
1361 | log_all_ref_updates = flag; | |
1362 | ||
1363 | rollbacklog: | |
1364 | if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref))) | |
1365 | error("unable to restore logfile %s from %s: %s", | |
1366 | oldref, newref, strerror(errno)); | |
1367 | if (!logmoved && log && | |
765c2258 PH |
1368 | rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldref))) |
1369 | error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s", | |
c976d415 LH |
1370 | oldref, strerror(errno)); |
1371 | ||
1372 | return 1; | |
1373 | } | |
1374 | ||
435fc852 | 1375 | int close_ref(struct ref_lock *lock) |
b531394d BC |
1376 | { |
1377 | if (close_lock_file(lock->lk)) | |
1378 | return -1; | |
1379 | lock->lock_fd = -1; | |
1380 | return 0; | |
1381 | } | |
1382 | ||
435fc852 | 1383 | int commit_ref(struct ref_lock *lock) |
b531394d BC |
1384 | { |
1385 | if (commit_lock_file(lock->lk)) | |
1386 | return -1; | |
1387 | lock->lock_fd = -1; | |
1388 | return 0; | |
1389 | } | |
1390 | ||
e5f38ec3 | 1391 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 | 1392 | { |
4ed7cd3a BC |
1393 | /* Do not free lock->lk -- atexit() still looks at them */ |
1394 | if (lock->lk) | |
1395 | rollback_lock_file(lock->lk); | |
434cd0cd | 1396 | free(lock->ref_name); |
1655707c | 1397 | free(lock->orig_ref_name); |
4bd18c43 SP |
1398 | free(lock); |
1399 | } | |
1400 | ||
0ec29a47 JH |
1401 | /* |
1402 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
1403 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
1404 | * because reflog file is one line per entry. | |
1405 | */ | |
1406 | static int copy_msg(char *buf, const char *msg) | |
1407 | { | |
1408 | char *cp = buf; | |
1409 | char c; | |
1410 | int wasspace = 1; | |
1411 | ||
1412 | *cp++ = '\t'; | |
1413 | while ((c = *msg++)) { | |
1414 | if (wasspace && isspace(c)) | |
1415 | continue; | |
1416 | wasspace = isspace(c); | |
1417 | if (wasspace) | |
1418 | c = ' '; | |
1419 | *cp++ = c; | |
1420 | } | |
1421 | while (buf < cp && isspace(cp[-1])) | |
1422 | cp--; | |
1423 | *cp++ = '\n'; | |
1424 | return cp - buf; | |
1425 | } | |
1426 | ||
157aaea5 | 1427 | int log_ref_setup(const char *ref_name, char *logfile, int bufsize) |
6de08ae6 | 1428 | { |
859c3017 | 1429 | int logfd, oflags = O_APPEND | O_WRONLY; |
9a13f0b7 | 1430 | |
157aaea5 | 1431 | git_snpath(logfile, bufsize, "logs/%s", ref_name); |
4057deb5 | 1432 | if (log_all_ref_updates && |
cc44c765 JH |
1433 | (!prefixcmp(ref_name, "refs/heads/") || |
1434 | !prefixcmp(ref_name, "refs/remotes/") || | |
b2e256b0 | 1435 | !prefixcmp(ref_name, "refs/notes/") || |
bd104db1 | 1436 | !strcmp(ref_name, "HEAD"))) { |
157aaea5 | 1437 | if (safe_create_leading_directories(logfile) < 0) |
6de08ae6 | 1438 | return error("unable to create directory for %s", |
157aaea5 | 1439 | logfile); |
6de08ae6 SP |
1440 | oflags |= O_CREAT; |
1441 | } | |
1442 | ||
157aaea5 | 1443 | logfd = open(logfile, oflags, 0666); |
6de08ae6 | 1444 | if (logfd < 0) { |
1974bf62 | 1445 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 1446 | return 0; |
3b463c3f JH |
1447 | |
1448 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
157aaea5 | 1449 | if (remove_empty_directories(logfile)) { |
3b463c3f | 1450 | return error("There are still logs under '%s'", |
157aaea5 | 1451 | logfile); |
3b463c3f | 1452 | } |
157aaea5 | 1453 | logfd = open(logfile, oflags, 0666); |
3b463c3f JH |
1454 | } |
1455 | ||
1456 | if (logfd < 0) | |
1457 | return error("Unable to append to %s: %s", | |
157aaea5 | 1458 | logfile, strerror(errno)); |
6de08ae6 SP |
1459 | } |
1460 | ||
157aaea5 | 1461 | adjust_shared_perm(logfile); |
859c3017 EM |
1462 | close(logfd); |
1463 | return 0; | |
1464 | } | |
443b92b6 | 1465 | |
859c3017 EM |
1466 | static int log_ref_write(const char *ref_name, const unsigned char *old_sha1, |
1467 | const unsigned char *new_sha1, const char *msg) | |
1468 | { | |
1469 | int logfd, result, written, oflags = O_APPEND | O_WRONLY; | |
1470 | unsigned maxlen, len; | |
1471 | int msglen; | |
157aaea5 | 1472 | char log_file[PATH_MAX]; |
859c3017 EM |
1473 | char *logrec; |
1474 | const char *committer; | |
1475 | ||
1476 | if (log_all_ref_updates < 0) | |
1477 | log_all_ref_updates = !is_bare_repository(); | |
1478 | ||
157aaea5 | 1479 | result = log_ref_setup(ref_name, log_file, sizeof(log_file)); |
859c3017 EM |
1480 | if (result) |
1481 | return result; | |
1482 | ||
1483 | logfd = open(log_file, oflags); | |
1484 | if (logfd < 0) | |
1485 | return 0; | |
0ec29a47 | 1486 | msglen = msg ? strlen(msg) : 0; |
774751a8 | 1487 | committer = git_committer_info(0); |
8ac65937 JH |
1488 | maxlen = strlen(committer) + msglen + 100; |
1489 | logrec = xmalloc(maxlen); | |
1490 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
1491 | sha1_to_hex(old_sha1), |
1492 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
1493 | committer); |
1494 | if (msglen) | |
0ec29a47 | 1495 | len += copy_msg(logrec + len - 1, msg) - 1; |
93822c22 | 1496 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 | 1497 | free(logrec); |
91c8d590 | 1498 | if (close(logfd) != 0 || written != len) |
9a13f0b7 | 1499 | return error("Unable to append to %s", log_file); |
6de08ae6 SP |
1500 | return 0; |
1501 | } | |
1502 | ||
c3b0dec5 LT |
1503 | static int is_branch(const char *refname) |
1504 | { | |
1505 | return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/"); | |
1506 | } | |
1507 | ||
4bd18c43 SP |
1508 | int write_ref_sha1(struct ref_lock *lock, |
1509 | const unsigned char *sha1, const char *logmsg) | |
1510 | { | |
1511 | static char term = '\n'; | |
c3b0dec5 | 1512 | struct object *o; |
4bd18c43 SP |
1513 | |
1514 | if (!lock) | |
95fc7512 | 1515 | return -1; |
a89fccd2 | 1516 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
1517 | unlock_ref(lock); |
1518 | return 0; | |
95fc7512 | 1519 | } |
c3b0dec5 LT |
1520 | o = parse_object(sha1); |
1521 | if (!o) { | |
7be8b3ba | 1522 | error("Trying to write ref %s with nonexistent object %s", |
c3b0dec5 LT |
1523 | lock->ref_name, sha1_to_hex(sha1)); |
1524 | unlock_ref(lock); | |
1525 | return -1; | |
1526 | } | |
1527 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1528 | error("Trying to write non-commit object %s to branch %s", | |
1529 | sha1_to_hex(sha1), lock->ref_name); | |
1530 | unlock_ref(lock); | |
1531 | return -1; | |
1532 | } | |
93822c22 AW |
1533 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
1534 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
b531394d | 1535 | || close_ref(lock) < 0) { |
c33d5174 | 1536 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
1537 | unlock_ref(lock); |
1538 | return -1; | |
1539 | } | |
5e290ff7 | 1540 | invalidate_cached_refs(); |
bd104db1 NP |
1541 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
1542 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
1543 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
1544 | unlock_ref(lock); |
1545 | return -1; | |
1546 | } | |
605fac8b NP |
1547 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
1548 | /* | |
1549 | * Special hack: If a branch is updated directly and HEAD | |
1550 | * points to it (may happen on the remote side of a push | |
1551 | * for example) then logically the HEAD reflog should be | |
1552 | * updated too. | |
1553 | * A generic solution implies reverse symref information, | |
1554 | * but finding all symrefs pointing to the given branch | |
1555 | * would be rather costly for this rare event (the direct | |
1556 | * update of a branch) to be worth it. So let's cheat and | |
1557 | * check with HEAD only which should cover 99% of all usage | |
1558 | * scenarios (even 100% of the default ones). | |
1559 | */ | |
1560 | unsigned char head_sha1[20]; | |
1561 | int head_flag; | |
1562 | const char *head_ref; | |
1563 | head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag); | |
1564 | if (head_ref && (head_flag & REF_ISSYMREF) && | |
1565 | !strcmp(head_ref, lock->ref_name)) | |
1566 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
1567 | } | |
b531394d | 1568 | if (commit_ref(lock)) { |
434cd0cd | 1569 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
1570 | unlock_ref(lock); |
1571 | return -1; | |
1572 | } | |
4bd18c43 SP |
1573 | unlock_ref(lock); |
1574 | return 0; | |
95fc7512 | 1575 | } |
d556fae2 | 1576 | |
8b5157e4 NP |
1577 | int create_symref(const char *ref_target, const char *refs_heads_master, |
1578 | const char *logmsg) | |
41b625b0 NP |
1579 | { |
1580 | const char *lockpath; | |
1581 | char ref[1000]; | |
1582 | int fd, len, written; | |
a4f34cbb | 1583 | char *git_HEAD = git_pathdup("%s", ref_target); |
8b5157e4 NP |
1584 | unsigned char old_sha1[20], new_sha1[20]; |
1585 | ||
1586 | if (logmsg && read_ref(ref_target, old_sha1)) | |
1587 | hashclr(old_sha1); | |
41b625b0 | 1588 | |
d48744d1 JH |
1589 | if (safe_create_leading_directories(git_HEAD) < 0) |
1590 | return error("unable to create directory for %s", git_HEAD); | |
1591 | ||
41b625b0 NP |
1592 | #ifndef NO_SYMLINK_HEAD |
1593 | if (prefer_symlink_refs) { | |
1594 | unlink(git_HEAD); | |
1595 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 1596 | goto done; |
41b625b0 NP |
1597 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
1598 | } | |
1599 | #endif | |
1600 | ||
1601 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
1602 | if (sizeof(ref) <= len) { | |
1603 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 1604 | goto error_free_return; |
41b625b0 NP |
1605 | } |
1606 | lockpath = mkpath("%s.lock", git_HEAD); | |
1607 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
1608 | if (fd < 0) { | |
1609 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 1610 | goto error_free_return; |
41b625b0 NP |
1611 | } |
1612 | written = write_in_full(fd, ref, len); | |
91c8d590 | 1613 | if (close(fd) != 0 || written != len) { |
41b625b0 | 1614 | error("Unable to write to %s", lockpath); |
47fc52e2 | 1615 | goto error_unlink_return; |
41b625b0 NP |
1616 | } |
1617 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 1618 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 1619 | goto error_unlink_return; |
41b625b0 NP |
1620 | } |
1621 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 1622 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 | 1623 | error_unlink_return: |
691f1a28 | 1624 | unlink_or_warn(lockpath); |
47fc52e2 JH |
1625 | error_free_return: |
1626 | free(git_HEAD); | |
1627 | return -1; | |
41b625b0 | 1628 | } |
8b5157e4 | 1629 | |
ee96d11b | 1630 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 1631 | done: |
ee96d11b | 1632 | #endif |
8b5157e4 NP |
1633 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
1634 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
1635 | ||
47fc52e2 | 1636 | free(git_HEAD); |
41b625b0 NP |
1637 | return 0; |
1638 | } | |
1639 | ||
16d7cc90 JH |
1640 | static char *ref_msg(const char *line, const char *endp) |
1641 | { | |
1642 | const char *ep; | |
16d7cc90 | 1643 | line += 82; |
182af834 PH |
1644 | ep = memchr(line, '\n', endp - line); |
1645 | if (!ep) | |
1646 | ep = endp; | |
1647 | return xmemdupz(line, ep - line); | |
16d7cc90 JH |
1648 | } |
1649 | ||
1650 | 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 | 1651 | { |
e5229042 | 1652 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 | 1653 | char *tz_c; |
e29cb53a | 1654 | int logfd, tz, reccnt = 0; |
d556fae2 SP |
1655 | struct stat st; |
1656 | unsigned long date; | |
e5229042 | 1657 | unsigned char logged_sha1[20]; |
cb48cb58 | 1658 | void *log_mapped; |
dc49cd76 | 1659 | size_t mapsz; |
d556fae2 SP |
1660 | |
1661 | logfile = git_path("logs/%s", ref); | |
1662 | logfd = open(logfile, O_RDONLY, 0); | |
1663 | if (logfd < 0) | |
d824cbba | 1664 | die_errno("Unable to read log '%s'", logfile); |
d556fae2 SP |
1665 | fstat(logfd, &st); |
1666 | if (!st.st_size) | |
1667 | die("Log %s is empty.", logfile); | |
dc49cd76 SP |
1668 | mapsz = xsize_t(st.st_size); |
1669 | log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0); | |
cb48cb58 | 1670 | logdata = log_mapped; |
d556fae2 SP |
1671 | close(logfd); |
1672 | ||
e5229042 | 1673 | lastrec = NULL; |
d556fae2 SP |
1674 | rec = logend = logdata + st.st_size; |
1675 | while (logdata < rec) { | |
e29cb53a | 1676 | reccnt++; |
d556fae2 SP |
1677 | if (logdata < rec && *(rec-1) == '\n') |
1678 | rec--; | |
e5229042 SP |
1679 | lastgt = NULL; |
1680 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 1681 | rec--; |
e5229042 SP |
1682 | if (*rec == '>') |
1683 | lastgt = rec; | |
1684 | } | |
1685 | if (!lastgt) | |
d556fae2 | 1686 | die("Log %s is corrupt.", logfile); |
e5229042 | 1687 | date = strtoul(lastgt + 1, &tz_c, 10); |
ab2a1a32 | 1688 | if (date <= at_time || cnt == 0) { |
76a44c5c | 1689 | tz = strtoul(tz_c, NULL, 10); |
16d7cc90 JH |
1690 | if (msg) |
1691 | *msg = ref_msg(rec, logend); | |
1692 | if (cutoff_time) | |
1693 | *cutoff_time = date; | |
1694 | if (cutoff_tz) | |
1695 | *cutoff_tz = tz; | |
1696 | if (cutoff_cnt) | |
76a44c5c | 1697 | *cutoff_cnt = reccnt - 1; |
e5229042 SP |
1698 | if (lastrec) { |
1699 | if (get_sha1_hex(lastrec, logged_sha1)) | |
1700 | die("Log %s is corrupt.", logfile); | |
1701 | if (get_sha1_hex(rec + 41, sha1)) | |
1702 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1703 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1704 | warning("Log %s has gap after %s.", |
73013afd | 1705 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 | 1706 | } |
e5f38ec3 JH |
1707 | } |
1708 | else if (date == at_time) { | |
e5229042 SP |
1709 | if (get_sha1_hex(rec + 41, sha1)) |
1710 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
1711 | } |
1712 | else { | |
e5229042 SP |
1713 | if (get_sha1_hex(rec + 41, logged_sha1)) |
1714 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1715 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1716 | warning("Log %s unexpectedly ended on %s.", |
73013afd | 1717 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 SP |
1718 | } |
1719 | } | |
dc49cd76 | 1720 | munmap(log_mapped, mapsz); |
d556fae2 SP |
1721 | return 0; |
1722 | } | |
e5229042 | 1723 | lastrec = rec; |
ab2a1a32 JH |
1724 | if (cnt > 0) |
1725 | cnt--; | |
d556fae2 SP |
1726 | } |
1727 | ||
e5229042 SP |
1728 | rec = logdata; |
1729 | while (rec < logend && *rec != '>' && *rec != '\n') | |
1730 | rec++; | |
1731 | if (rec == logend || *rec == '\n') | |
d556fae2 | 1732 | die("Log %s is corrupt.", logfile); |
e5229042 | 1733 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
1734 | tz = strtoul(tz_c, NULL, 10); |
1735 | if (get_sha1_hex(logdata, sha1)) | |
1736 | die("Log %s is corrupt.", logfile); | |
d1a4489a JK |
1737 | if (is_null_sha1(sha1)) { |
1738 | if (get_sha1_hex(logdata + 41, sha1)) | |
1739 | die("Log %s is corrupt.", logfile); | |
1740 | } | |
16d7cc90 JH |
1741 | if (msg) |
1742 | *msg = ref_msg(logdata, logend); | |
dc49cd76 | 1743 | munmap(log_mapped, mapsz); |
16d7cc90 JH |
1744 | |
1745 | if (cutoff_time) | |
1746 | *cutoff_time = date; | |
1747 | if (cutoff_tz) | |
1748 | *cutoff_tz = tz; | |
1749 | if (cutoff_cnt) | |
1750 | *cutoff_cnt = reccnt; | |
1751 | return 1; | |
d556fae2 | 1752 | } |
2ff81662 | 1753 | |
101d15e0 | 1754 | int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long ofs, void *cb_data) |
2ff81662 JH |
1755 | { |
1756 | const char *logfile; | |
1757 | FILE *logfp; | |
8ca78803 | 1758 | struct strbuf sb = STRBUF_INIT; |
2266bf27 | 1759 | int ret = 0; |
2ff81662 JH |
1760 | |
1761 | logfile = git_path("logs/%s", ref); | |
1762 | logfp = fopen(logfile, "r"); | |
1763 | if (!logfp) | |
883d60fa | 1764 | return -1; |
101d15e0 JH |
1765 | |
1766 | if (ofs) { | |
1767 | struct stat statbuf; | |
1768 | if (fstat(fileno(logfp), &statbuf) || | |
1769 | statbuf.st_size < ofs || | |
1770 | fseek(logfp, -ofs, SEEK_END) || | |
8ca78803 | 1771 | strbuf_getwholeline(&sb, logfp, '\n')) { |
9d33f7c2 | 1772 | fclose(logfp); |
8ca78803 | 1773 | strbuf_release(&sb); |
101d15e0 | 1774 | return -1; |
9d33f7c2 | 1775 | } |
101d15e0 JH |
1776 | } |
1777 | ||
8ca78803 | 1778 | while (!strbuf_getwholeline(&sb, logfp, '\n')) { |
2ff81662 | 1779 | unsigned char osha1[20], nsha1[20]; |
883d60fa JS |
1780 | char *email_end, *message; |
1781 | unsigned long timestamp; | |
8ca78803 | 1782 | int tz; |
2ff81662 JH |
1783 | |
1784 | /* old SP new SP name <email> SP time TAB msg LF */ | |
8ca78803 RS |
1785 | if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' || |
1786 | get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' || | |
1787 | get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' || | |
1788 | !(email_end = strchr(sb.buf + 82, '>')) || | |
883d60fa JS |
1789 | email_end[1] != ' ' || |
1790 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
1791 | !message || message[0] != ' ' || | |
1792 | (message[1] != '+' && message[1] != '-') || | |
1793 | !isdigit(message[2]) || !isdigit(message[3]) || | |
b4dd4856 | 1794 | !isdigit(message[4]) || !isdigit(message[5])) |
2ff81662 | 1795 | continue; /* corrupt? */ |
883d60fa JS |
1796 | email_end[1] = '\0'; |
1797 | tz = strtol(message + 1, NULL, 10); | |
b4dd4856 JS |
1798 | if (message[6] != '\t') |
1799 | message += 6; | |
1800 | else | |
1801 | message += 7; | |
8ca78803 RS |
1802 | ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message, |
1803 | cb_data); | |
883d60fa | 1804 | if (ret) |
2266bf27 | 1805 | break; |
2ff81662 JH |
1806 | } |
1807 | fclose(logfp); | |
8ca78803 | 1808 | strbuf_release(&sb); |
2266bf27 | 1809 | return ret; |
2ff81662 | 1810 | } |
e29cb53a | 1811 | |
101d15e0 JH |
1812 | int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data) |
1813 | { | |
1814 | return for_each_recent_reflog_ent(ref, fn, 0, cb_data); | |
1815 | } | |
1816 | ||
eb8381c8 NP |
1817 | static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data) |
1818 | { | |
1819 | DIR *dir = opendir(git_path("logs/%s", base)); | |
fcee5a14 | 1820 | int retval = 0; |
eb8381c8 NP |
1821 | |
1822 | if (dir) { | |
1823 | struct dirent *de; | |
1824 | int baselen = strlen(base); | |
1825 | char *log = xmalloc(baselen + 257); | |
1826 | ||
1827 | memcpy(log, base, baselen); | |
1828 | if (baselen && base[baselen-1] != '/') | |
1829 | log[baselen++] = '/'; | |
1830 | ||
1831 | while ((de = readdir(dir)) != NULL) { | |
1832 | struct stat st; | |
1833 | int namelen; | |
1834 | ||
1835 | if (de->d_name[0] == '.') | |
1836 | continue; | |
1837 | namelen = strlen(de->d_name); | |
1838 | if (namelen > 255) | |
1839 | continue; | |
1840 | if (has_extension(de->d_name, ".lock")) | |
1841 | continue; | |
1842 | memcpy(log + baselen, de->d_name, namelen+1); | |
1843 | if (stat(git_path("logs/%s", log), &st) < 0) | |
1844 | continue; | |
1845 | if (S_ISDIR(st.st_mode)) { | |
1846 | retval = do_for_each_reflog(log, fn, cb_data); | |
1847 | } else { | |
1848 | unsigned char sha1[20]; | |
1849 | if (!resolve_ref(log, sha1, 0, NULL)) | |
1850 | retval = error("bad ref for %s", log); | |
1851 | else | |
1852 | retval = fn(log, sha1, 0, cb_data); | |
1853 | } | |
1854 | if (retval) | |
1855 | break; | |
1856 | } | |
1857 | free(log); | |
1858 | closedir(dir); | |
1859 | } | |
acb39f64 | 1860 | else if (*base) |
fcee5a14 | 1861 | return errno; |
eb8381c8 NP |
1862 | return retval; |
1863 | } | |
1864 | ||
1865 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
1866 | { | |
1867 | return do_for_each_reflog("", fn, cb_data); | |
1868 | } | |
3d9f037c CR |
1869 | |
1870 | int update_ref(const char *action, const char *refname, | |
1871 | const unsigned char *sha1, const unsigned char *oldval, | |
1872 | int flags, enum action_on_err onerr) | |
1873 | { | |
1874 | static struct ref_lock *lock; | |
1875 | lock = lock_any_ref_for_update(refname, oldval, flags); | |
1876 | if (!lock) { | |
1877 | const char *str = "Cannot lock the ref '%s'."; | |
1878 | switch (onerr) { | |
1879 | case MSG_ON_ERR: error(str, refname); break; | |
1880 | case DIE_ON_ERR: die(str, refname); break; | |
1881 | case QUIET_ON_ERR: break; | |
1882 | } | |
1883 | return 1; | |
1884 | } | |
1885 | if (write_ref_sha1(lock, sha1, action) < 0) { | |
1886 | const char *str = "Cannot update the ref '%s'."; | |
1887 | switch (onerr) { | |
1888 | case MSG_ON_ERR: error(str, refname); break; | |
1889 | case DIE_ON_ERR: die(str, refname); break; | |
1890 | case QUIET_ON_ERR: break; | |
1891 | } | |
1892 | return 1; | |
1893 | } | |
1894 | return 0; | |
1895 | } | |
cda69f48 | 1896 | |
2c5c66be | 1897 | int ref_exists(const char *refname) |
c17b2294 JH |
1898 | { |
1899 | unsigned char sha1[20]; | |
1900 | return !!resolve_ref(refname, sha1, 1, NULL); | |
1901 | } | |
1902 | ||
5483f799 | 1903 | struct ref *find_ref_by_name(const struct ref *list, const char *name) |
cda69f48 JK |
1904 | { |
1905 | for ( ; list; list = list->next) | |
1906 | if (!strcmp(list->name, name)) | |
5483f799 | 1907 | return (struct ref *)list; |
cda69f48 JK |
1908 | return NULL; |
1909 | } | |
7c2b3029 JK |
1910 | |
1911 | /* | |
1912 | * generate a format suitable for scanf from a ref_rev_parse_rules | |
1913 | * rule, that is replace the "%.*s" spec with a "%s" spec | |
1914 | */ | |
1915 | static void gen_scanf_fmt(char *scanf_fmt, const char *rule) | |
1916 | { | |
1917 | char *spec; | |
1918 | ||
1919 | spec = strstr(rule, "%.*s"); | |
1920 | if (!spec || strstr(spec + 4, "%.*s")) | |
1921 | die("invalid rule in ref_rev_parse_rules: %s", rule); | |
1922 | ||
1923 | /* copy all until spec */ | |
1924 | strncpy(scanf_fmt, rule, spec - rule); | |
1925 | scanf_fmt[spec - rule] = '\0'; | |
1926 | /* copy new spec */ | |
1927 | strcat(scanf_fmt, "%s"); | |
1928 | /* copy remaining rule */ | |
1929 | strcat(scanf_fmt, spec + 4); | |
1930 | ||
1931 | return; | |
1932 | } | |
1933 | ||
6e7b3309 | 1934 | char *shorten_unambiguous_ref(const char *ref, int strict) |
7c2b3029 JK |
1935 | { |
1936 | int i; | |
1937 | static char **scanf_fmts; | |
1938 | static int nr_rules; | |
1939 | char *short_name; | |
1940 | ||
1941 | /* pre generate scanf formats from ref_rev_parse_rules[] */ | |
1942 | if (!nr_rules) { | |
1943 | size_t total_len = 0; | |
1944 | ||
1945 | /* the rule list is NULL terminated, count them first */ | |
1946 | for (; ref_rev_parse_rules[nr_rules]; nr_rules++) | |
1947 | /* no +1 because strlen("%s") < strlen("%.*s") */ | |
1948 | total_len += strlen(ref_rev_parse_rules[nr_rules]); | |
1949 | ||
1950 | scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len); | |
1951 | ||
1952 | total_len = 0; | |
1953 | for (i = 0; i < nr_rules; i++) { | |
1954 | scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] | |
1955 | + total_len; | |
1956 | gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]); | |
1957 | total_len += strlen(ref_rev_parse_rules[i]); | |
1958 | } | |
1959 | } | |
1960 | ||
1961 | /* bail out if there are no rules */ | |
1962 | if (!nr_rules) | |
1963 | return xstrdup(ref); | |
1964 | ||
1965 | /* buffer for scanf result, at most ref must fit */ | |
1966 | short_name = xstrdup(ref); | |
1967 | ||
1968 | /* skip first rule, it will always match */ | |
1969 | for (i = nr_rules - 1; i > 0 ; --i) { | |
1970 | int j; | |
6e7b3309 | 1971 | int rules_to_fail = i; |
7c2b3029 JK |
1972 | int short_name_len; |
1973 | ||
1974 | if (1 != sscanf(ref, scanf_fmts[i], short_name)) | |
1975 | continue; | |
1976 | ||
1977 | short_name_len = strlen(short_name); | |
1978 | ||
6e7b3309 BW |
1979 | /* |
1980 | * in strict mode, all (except the matched one) rules | |
1981 | * must fail to resolve to a valid non-ambiguous ref | |
1982 | */ | |
1983 | if (strict) | |
1984 | rules_to_fail = nr_rules; | |
1985 | ||
7c2b3029 JK |
1986 | /* |
1987 | * check if the short name resolves to a valid ref, | |
1988 | * but use only rules prior to the matched one | |
1989 | */ | |
6e7b3309 | 1990 | for (j = 0; j < rules_to_fail; j++) { |
7c2b3029 JK |
1991 | const char *rule = ref_rev_parse_rules[j]; |
1992 | unsigned char short_objectname[20]; | |
1993 | char refname[PATH_MAX]; | |
1994 | ||
6e7b3309 BW |
1995 | /* skip matched rule */ |
1996 | if (i == j) | |
1997 | continue; | |
1998 | ||
7c2b3029 JK |
1999 | /* |
2000 | * the short name is ambiguous, if it resolves | |
2001 | * (with this previous rule) to a valid ref | |
2002 | * read_ref() returns 0 on success | |
2003 | */ | |
2004 | mksnpath(refname, sizeof(refname), | |
2005 | rule, short_name_len, short_name); | |
2006 | if (!read_ref(refname, short_objectname)) | |
2007 | break; | |
2008 | } | |
2009 | ||
2010 | /* | |
2011 | * short name is non-ambiguous if all previous rules | |
2012 | * haven't resolved to a valid ref | |
2013 | */ | |
6e7b3309 | 2014 | if (j == rules_to_fail) |
7c2b3029 JK |
2015 | return short_name; |
2016 | } | |
2017 | ||
2018 | free(short_name); | |
2019 | return xstrdup(ref); | |
2020 | } |