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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 | |
98ac34b2 JH |
7 | /* ISSYMREF=0x01, ISPACKED=0x02 and ISBROKEN=0x04 are public interfaces */ |
8 | #define REF_KNOWS_PEELED 0x10 | |
f4204ab9 | 9 | |
e9c4c111 | 10 | struct ref_entry { |
f4204ab9 | 11 | unsigned char flag; /* ISSYMREF? ISPACKED? */ |
e1e22e37 | 12 | unsigned char sha1[20]; |
f4204ab9 | 13 | unsigned char peeled[20]; |
c49b039b | 14 | /* The full name of the reference (e.g., "refs/heads/master"): */ |
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 | 51 | static void add_ref(const char *name, const unsigned char *sha1, |
09116a1c | 52 | int flag, int check_name, struct ref_array *refs, |
e9c4c111 | 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); |
09116a1c JH |
63 | if (check_name && |
64 | check_refname_format(name, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT)) | |
dce4bab6 | 65 | die("Reference has invalid format: '%s'", name); |
e1e22e37 | 66 | memcpy(entry->name, name, len); |
8da19775 | 67 | entry->flag = flag; |
f4204ab9 JH |
68 | if (new_entry) |
69 | *new_entry = entry; | |
e9c4c111 JP |
70 | ALLOC_GROW(refs->refs, refs->nr + 1, refs->alloc); |
71 | refs->refs[refs->nr++] = entry; | |
c774aab9 JP |
72 | } |
73 | ||
e9c4c111 | 74 | static int ref_entry_cmp(const void *a, const void *b) |
c774aab9 | 75 | { |
e9c4c111 JP |
76 | struct ref_entry *one = *(struct ref_entry **)a; |
77 | struct ref_entry *two = *(struct ref_entry **)b; | |
78 | return strcmp(one->name, two->name); | |
79 | } | |
c774aab9 | 80 | |
e9c4c111 JP |
81 | static void sort_ref_array(struct ref_array *array) |
82 | { | |
83 | int i = 0, j = 1; | |
c774aab9 | 84 | |
e9c4c111 JP |
85 | /* Nothing to sort unless there are at least two entries */ |
86 | if (array->nr < 2) | |
87 | return; | |
c774aab9 | 88 | |
e9c4c111 | 89 | qsort(array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp); |
c774aab9 | 90 | |
e9c4c111 JP |
91 | /* Remove any duplicates from the ref_array */ |
92 | for (; j < array->nr; j++) { | |
93 | struct ref_entry *a = array->refs[i]; | |
94 | struct ref_entry *b = array->refs[j]; | |
95 | if (!strcmp(a->name, b->name)) { | |
96 | if (hashcmp(a->sha1, b->sha1)) | |
97 | die("Duplicated ref, and SHA1s don't match: %s", | |
98 | a->name); | |
99 | warning("Duplicated ref: %s", a->name); | |
17d68a54 | 100 | free(b); |
e9c4c111 JP |
101 | continue; |
102 | } | |
103 | i++; | |
104 | array->refs[i] = array->refs[j]; | |
105 | } | |
106 | array->nr = i + 1; | |
107 | } | |
c774aab9 | 108 | |
e9c4c111 JP |
109 | static struct ref_entry *search_ref_array(struct ref_array *array, const char *name) |
110 | { | |
111 | struct ref_entry *e, **r; | |
112 | int len; | |
c774aab9 | 113 | |
e9c4c111 JP |
114 | if (name == NULL) |
115 | return NULL; | |
c774aab9 | 116 | |
68729696 BC |
117 | if (!array->nr) |
118 | return NULL; | |
c774aab9 | 119 | |
e9c4c111 JP |
120 | len = strlen(name) + 1; |
121 | e = xmalloc(sizeof(struct ref_entry) + len); | |
122 | memcpy(e->name, name, len); | |
c774aab9 | 123 | |
e9c4c111 | 124 | r = bsearch(&e, array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp); |
c774aab9 | 125 | |
e9c4c111 | 126 | free(e); |
c774aab9 | 127 | |
e9c4c111 JP |
128 | if (r == NULL) |
129 | return NULL; | |
c774aab9 | 130 | |
e9c4c111 | 131 | return *r; |
e1e22e37 LT |
132 | } |
133 | ||
5e290ff7 JH |
134 | /* |
135 | * Future: need to be in "struct repository" | |
136 | * when doing a full libification. | |
137 | */ | |
79c7ca54 MH |
138 | static struct ref_cache { |
139 | struct ref_cache *next; | |
5e290ff7 JH |
140 | char did_loose; |
141 | char did_packed; | |
e9c4c111 JP |
142 | struct ref_array loose; |
143 | struct ref_array packed; | |
ce40979c MH |
144 | /* The submodule name, or "" for the main repo. */ |
145 | char name[FLEX_ARRAY]; | |
79c7ca54 | 146 | } *ref_cache; |
0e88c130 | 147 | |
e9c4c111 | 148 | static struct ref_entry *current_ref; |
5e290ff7 | 149 | |
e9c4c111 | 150 | static struct ref_array extra_refs; |
e142a3c6 | 151 | |
e9c4c111 | 152 | static void free_ref_array(struct ref_array *array) |
5e290ff7 | 153 | { |
e9c4c111 JP |
154 | int i; |
155 | for (i = 0; i < array->nr; i++) | |
156 | free(array->refs[i]); | |
157 | free(array->refs); | |
158 | array->nr = array->alloc = 0; | |
159 | array->refs = NULL; | |
5e290ff7 JH |
160 | } |
161 | ||
760c4512 | 162 | static void clear_packed_ref_cache(struct ref_cache *refs) |
e1e22e37 | 163 | { |
1b7edaf9 MH |
164 | if (refs->did_packed) |
165 | free_ref_array(&refs->packed); | |
760c4512 | 166 | refs->did_packed = 0; |
5e290ff7 | 167 | } |
e1e22e37 | 168 | |
760c4512 MH |
169 | static void clear_loose_ref_cache(struct ref_cache *refs) |
170 | { | |
171 | if (refs->did_loose) | |
172 | free_ref_array(&refs->loose); | |
173 | refs->did_loose = 0; | |
174 | } | |
175 | ||
79c7ca54 | 176 | static struct ref_cache *create_ref_cache(const char *submodule) |
e5dbf605 | 177 | { |
ce40979c | 178 | int len; |
79c7ca54 | 179 | struct ref_cache *refs; |
ce40979c MH |
180 | if (!submodule) |
181 | submodule = ""; | |
182 | len = strlen(submodule) + 1; | |
79c7ca54 | 183 | refs = xcalloc(1, sizeof(struct ref_cache) + len); |
ce40979c | 184 | memcpy(refs->name, submodule, len); |
e5dbf605 MH |
185 | return refs; |
186 | } | |
187 | ||
4349a668 | 188 | /* |
79c7ca54 | 189 | * Return a pointer to a ref_cache for the specified submodule. For |
4349a668 MH |
190 | * the main repository, use submodule==NULL. The returned structure |
191 | * will be allocated and initialized but not necessarily populated; it | |
192 | * should not be freed. | |
193 | */ | |
79c7ca54 | 194 | static struct ref_cache *get_ref_cache(const char *submodule) |
4349a668 | 195 | { |
79c7ca54 | 196 | struct ref_cache *refs = ref_cache; |
0e88c130 MH |
197 | if (!submodule) |
198 | submodule = ""; | |
199 | while (refs) { | |
200 | if (!strcmp(submodule, refs->name)) | |
201 | return refs; | |
202 | refs = refs->next; | |
4349a668 | 203 | } |
0e88c130 | 204 | |
79c7ca54 MH |
205 | refs = create_ref_cache(submodule); |
206 | refs->next = ref_cache; | |
207 | ref_cache = refs; | |
0e88c130 | 208 | return refs; |
4349a668 MH |
209 | } |
210 | ||
8be8bde7 | 211 | void invalidate_ref_cache(const char *submodule) |
f130b116 | 212 | { |
c5f29abd MH |
213 | struct ref_cache *refs = get_ref_cache(submodule); |
214 | clear_packed_ref_cache(refs); | |
215 | clear_loose_ref_cache(refs); | |
5e290ff7 | 216 | } |
e1e22e37 | 217 | |
2c5c66be | 218 | static void read_packed_refs(FILE *f, struct ref_array *array) |
f4204ab9 | 219 | { |
e9c4c111 | 220 | struct ref_entry *last = NULL; |
f4204ab9 JH |
221 | char refline[PATH_MAX]; |
222 | int flag = REF_ISPACKED; | |
223 | ||
224 | while (fgets(refline, sizeof(refline), f)) { | |
225 | unsigned char sha1[20]; | |
226 | const char *name; | |
227 | static const char header[] = "# pack-refs with:"; | |
228 | ||
229 | if (!strncmp(refline, header, sizeof(header)-1)) { | |
230 | const char *traits = refline + sizeof(header) - 1; | |
231 | if (strstr(traits, " peeled ")) | |
232 | flag |= REF_KNOWS_PEELED; | |
233 | /* perhaps other traits later as well */ | |
234 | continue; | |
235 | } | |
236 | ||
237 | name = parse_ref_line(refline, sha1); | |
238 | if (name) { | |
09116a1c | 239 | add_ref(name, sha1, flag, 1, array, &last); |
f4204ab9 JH |
240 | continue; |
241 | } | |
242 | if (last && | |
243 | refline[0] == '^' && | |
244 | strlen(refline) == 42 && | |
245 | refline[41] == '\n' && | |
246 | !get_sha1_hex(refline + 1, sha1)) | |
247 | hashcpy(last->peeled, sha1); | |
248 | } | |
2c5c66be | 249 | sort_ref_array(array); |
f4204ab9 JH |
250 | } |
251 | ||
e142a3c6 DB |
252 | void add_extra_ref(const char *name, const unsigned char *sha1, int flag) |
253 | { | |
09116a1c | 254 | add_ref(name, sha1, flag, 0, &extra_refs, NULL); |
e142a3c6 DB |
255 | } |
256 | ||
257 | void clear_extra_refs(void) | |
258 | { | |
e9c4c111 | 259 | free_ref_array(&extra_refs); |
e142a3c6 DB |
260 | } |
261 | ||
e9c4c111 | 262 | static struct ref_array *get_packed_refs(const char *submodule) |
5e290ff7 | 263 | { |
79c7ca54 | 264 | struct ref_cache *refs = get_ref_cache(submodule); |
0bad611b | 265 | |
4349a668 MH |
266 | if (!refs->did_packed) { |
267 | const char *packed_refs_file; | |
268 | FILE *f; | |
0bad611b | 269 | |
4349a668 MH |
270 | if (submodule) |
271 | packed_refs_file = git_path_submodule(submodule, "packed-refs"); | |
272 | else | |
273 | packed_refs_file = git_path("packed-refs"); | |
274 | f = fopen(packed_refs_file, "r"); | |
e1e22e37 | 275 | if (f) { |
2c5c66be | 276 | read_packed_refs(f, &refs->packed); |
e1e22e37 | 277 | fclose(f); |
e1e22e37 | 278 | } |
0bad611b | 279 | refs->did_packed = 1; |
e1e22e37 | 280 | } |
e9c4c111 | 281 | return &refs->packed; |
e1e22e37 LT |
282 | } |
283 | ||
e9c4c111 JP |
284 | static void get_ref_dir(const char *submodule, const char *base, |
285 | struct ref_array *array) | |
e1e22e37 | 286 | { |
0bad611b HV |
287 | DIR *dir; |
288 | const char *path; | |
289 | ||
290 | if (submodule) | |
291 | path = git_path_submodule(submodule, "%s", base); | |
292 | else | |
293 | path = git_path("%s", base); | |
294 | ||
295 | ||
296 | dir = opendir(path); | |
e1e22e37 LT |
297 | |
298 | if (dir) { | |
299 | struct dirent *de; | |
300 | int baselen = strlen(base); | |
ed378ec7 | 301 | char *ref = xmalloc(baselen + 257); |
e1e22e37 | 302 | |
ed378ec7 | 303 | memcpy(ref, base, baselen); |
e1e22e37 | 304 | if (baselen && base[baselen-1] != '/') |
ed378ec7 | 305 | ref[baselen++] = '/'; |
e1e22e37 LT |
306 | |
307 | while ((de = readdir(dir)) != NULL) { | |
308 | unsigned char sha1[20]; | |
309 | struct stat st; | |
8da19775 | 310 | int flag; |
e1e22e37 | 311 | int namelen; |
0bad611b | 312 | const char *refdir; |
e1e22e37 LT |
313 | |
314 | if (de->d_name[0] == '.') | |
315 | continue; | |
316 | namelen = strlen(de->d_name); | |
317 | if (namelen > 255) | |
318 | continue; | |
319 | if (has_extension(de->d_name, ".lock")) | |
320 | continue; | |
ed378ec7 | 321 | memcpy(ref + baselen, de->d_name, namelen+1); |
0bad611b HV |
322 | refdir = submodule |
323 | ? git_path_submodule(submodule, "%s", ref) | |
324 | : git_path("%s", ref); | |
325 | if (stat(refdir, &st) < 0) | |
e1e22e37 LT |
326 | continue; |
327 | if (S_ISDIR(st.st_mode)) { | |
e9c4c111 | 328 | get_ref_dir(submodule, ref, array); |
e1e22e37 LT |
329 | continue; |
330 | } | |
0bad611b | 331 | if (submodule) { |
f8948e2f | 332 | hashclr(sha1); |
0bad611b HV |
333 | flag = 0; |
334 | if (resolve_gitlink_ref(submodule, ref, sha1) < 0) { | |
335 | hashclr(sha1); | |
98ac34b2 | 336 | flag |= REF_ISBROKEN; |
0bad611b | 337 | } |
b7f7c079 | 338 | } else if (read_ref_full(ref, sha1, 1, &flag)) { |
09116a1c JH |
339 | hashclr(sha1); |
340 | flag |= REF_ISBROKEN; | |
341 | } | |
342 | add_ref(ref, sha1, flag, 1, array, NULL); | |
e1e22e37 | 343 | } |
ed378ec7 | 344 | free(ref); |
e1e22e37 LT |
345 | closedir(dir); |
346 | } | |
e1e22e37 LT |
347 | } |
348 | ||
f8948e2f | 349 | struct warn_if_dangling_data { |
3cf6134a | 350 | FILE *fp; |
f8948e2f JH |
351 | const char *refname; |
352 | const char *msg_fmt; | |
353 | }; | |
354 | ||
355 | static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1, | |
356 | int flags, void *cb_data) | |
357 | { | |
358 | struct warn_if_dangling_data *d = cb_data; | |
359 | const char *resolves_to; | |
360 | unsigned char junk[20]; | |
361 | ||
362 | if (!(flags & REF_ISSYMREF)) | |
363 | return 0; | |
364 | ||
365 | resolves_to = resolve_ref(refname, junk, 0, NULL); | |
366 | if (!resolves_to || strcmp(resolves_to, d->refname)) | |
367 | return 0; | |
368 | ||
3cf6134a | 369 | fprintf(d->fp, d->msg_fmt, refname); |
f8948e2f JH |
370 | return 0; |
371 | } | |
372 | ||
3cf6134a | 373 | void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname) |
f8948e2f | 374 | { |
66dbfd55 GV |
375 | struct warn_if_dangling_data data; |
376 | ||
377 | data.fp = fp; | |
378 | data.refname = refname; | |
379 | data.msg_fmt = msg_fmt; | |
f8948e2f JH |
380 | for_each_rawref(warn_if_dangling_symref, &data); |
381 | } | |
382 | ||
e9c4c111 | 383 | static struct ref_array *get_loose_refs(const char *submodule) |
e1e22e37 | 384 | { |
79c7ca54 | 385 | struct ref_cache *refs = get_ref_cache(submodule); |
0bad611b | 386 | |
4349a668 | 387 | if (!refs->did_loose) { |
2c5c66be JH |
388 | get_ref_dir(submodule, "refs", &refs->loose); |
389 | sort_ref_array(&refs->loose); | |
4349a668 | 390 | refs->did_loose = 1; |
e1e22e37 | 391 | } |
2c5c66be | 392 | return &refs->loose; |
e1e22e37 LT |
393 | } |
394 | ||
ca8db142 LT |
395 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
396 | #define MAXDEPTH 5 | |
0ebde32c LT |
397 | #define MAXREFLEN (1024) |
398 | ||
e5fa45c1 JH |
399 | /* |
400 | * Called by resolve_gitlink_ref_recursive() after it failed to read | |
401 | * from "name", which is "module/.git/<refname>". Find <refname> in | |
402 | * the packed-refs file for the submodule. | |
403 | */ | |
0ebde32c LT |
404 | static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result) |
405 | { | |
e9c4c111 | 406 | int retval = -1; |
2c5c66be | 407 | struct ref_entry *ref; |
e5fa45c1 | 408 | struct ref_array *array; |
0ebde32c | 409 | |
e5fa45c1 JH |
410 | /* being defensive: resolve_gitlink_ref() did this for us */ |
411 | if (pathlen < 6 || memcmp(name + pathlen - 6, "/.git/", 6)) | |
412 | die("Oops"); | |
413 | name[pathlen - 6] = '\0'; /* make it path to the submodule */ | |
414 | array = get_packed_refs(name); | |
2c5c66be | 415 | ref = search_ref_array(array, refname); |
e9c4c111 JP |
416 | if (ref != NULL) { |
417 | memcpy(result, ref->sha1, 20); | |
418 | retval = 0; | |
0ebde32c | 419 | } |
0ebde32c LT |
420 | return retval; |
421 | } | |
422 | ||
423 | static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion) | |
424 | { | |
425 | int fd, len = strlen(refname); | |
426 | char buffer[128], *p; | |
427 | ||
428 | if (recursion > MAXDEPTH || len > MAXREFLEN) | |
429 | return -1; | |
430 | memcpy(name + pathlen, refname, len+1); | |
431 | fd = open(name, O_RDONLY); | |
432 | if (fd < 0) | |
433 | return resolve_gitlink_packed_ref(name, pathlen, refname, result); | |
434 | ||
435 | len = read(fd, buffer, sizeof(buffer)-1); | |
436 | close(fd); | |
437 | if (len < 0) | |
438 | return -1; | |
439 | while (len && isspace(buffer[len-1])) | |
440 | len--; | |
441 | buffer[len] = 0; | |
442 | ||
443 | /* Was it a detached head or an old-fashioned symlink? */ | |
444 | if (!get_sha1_hex(buffer, result)) | |
445 | return 0; | |
446 | ||
447 | /* Symref? */ | |
448 | if (strncmp(buffer, "ref:", 4)) | |
449 | return -1; | |
450 | p = buffer + 4; | |
451 | while (isspace(*p)) | |
452 | p++; | |
453 | ||
454 | return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1); | |
455 | } | |
456 | ||
457 | int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result) | |
458 | { | |
459 | int len = strlen(path), retval; | |
460 | char *gitdir; | |
842abf06 | 461 | const char *tmp; |
0ebde32c LT |
462 | |
463 | while (len && path[len-1] == '/') | |
464 | len--; | |
465 | if (!len) | |
466 | return -1; | |
467 | gitdir = xmalloc(len + MAXREFLEN + 8); | |
468 | memcpy(gitdir, path, len); | |
842abf06 LH |
469 | memcpy(gitdir + len, "/.git", 6); |
470 | len += 5; | |
471 | ||
13d6ec91 | 472 | tmp = read_gitfile(gitdir); |
842abf06 LH |
473 | if (tmp) { |
474 | free(gitdir); | |
475 | len = strlen(tmp); | |
476 | gitdir = xmalloc(len + MAXREFLEN + 3); | |
477 | memcpy(gitdir, tmp, len); | |
478 | } | |
479 | gitdir[len] = '/'; | |
480 | gitdir[++len] = '\0'; | |
481 | retval = resolve_gitlink_ref_recursive(gitdir, len, refname, result, 0); | |
0ebde32c LT |
482 | free(gitdir); |
483 | return retval; | |
484 | } | |
ca8db142 | 485 | |
4886b89f | 486 | /* |
c224ca7f MH |
487 | * Try to read ref from the packed references. On success, set sha1 |
488 | * and return 0; otherwise, return -1. | |
4886b89f | 489 | */ |
c224ca7f MH |
490 | static int get_packed_ref(const char *ref, unsigned char *sha1) |
491 | { | |
2c5c66be JH |
492 | struct ref_array *packed = get_packed_refs(NULL); |
493 | struct ref_entry *entry = search_ref_array(packed, ref); | |
494 | if (entry) { | |
495 | hashcpy(sha1, entry->sha1); | |
496 | return 0; | |
c224ca7f MH |
497 | } |
498 | return -1; | |
499 | } | |
500 | ||
8da19775 | 501 | const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 502 | { |
0104ca09 HO |
503 | int depth = MAXDEPTH; |
504 | ssize_t len; | |
a876ed83 | 505 | char buffer[256]; |
ed378ec7 | 506 | static char ref_buffer[256]; |
ca8db142 | 507 | |
8da19775 JH |
508 | if (flag) |
509 | *flag = 0; | |
510 | ||
8384d788 MH |
511 | if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL)) |
512 | return NULL; | |
513 | ||
a876ed83 | 514 | for (;;) { |
55956350 | 515 | char path[PATH_MAX]; |
a876ed83 JH |
516 | struct stat st; |
517 | char *buf; | |
518 | int fd; | |
8a65ff76 | 519 | |
a876ed83 JH |
520 | if (--depth < 0) |
521 | return NULL; | |
ca8db142 | 522 | |
958a4789 | 523 | git_snpath(path, sizeof(path), "%s", ref); |
c224ca7f | 524 | |
a876ed83 | 525 | if (lstat(path, &st) < 0) { |
c224ca7f MH |
526 | if (errno != ENOENT) |
527 | return NULL; | |
528 | /* | |
529 | * The loose reference file does not exist; | |
530 | * check for a packed reference. | |
531 | */ | |
532 | if (!get_packed_ref(ref, sha1)) { | |
533 | if (flag) | |
534 | *flag |= REF_ISPACKED; | |
535 | return ref; | |
434cd0cd | 536 | } |
c224ca7f MH |
537 | /* The reference is not a packed reference, either. */ |
538 | if (reading) { | |
a876ed83 | 539 | return NULL; |
c224ca7f MH |
540 | } else { |
541 | hashclr(sha1); | |
542 | return ref; | |
543 | } | |
a876ed83 | 544 | } |
ca8db142 | 545 | |
a876ed83 JH |
546 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
547 | if (S_ISLNK(st.st_mode)) { | |
548 | len = readlink(path, buffer, sizeof(buffer)-1); | |
7bb2bf8e MH |
549 | if (len < 0) |
550 | return NULL; | |
b54cb795 | 551 | buffer[len] = 0; |
1f58a038 MH |
552 | if (!prefixcmp(buffer, "refs/") && |
553 | !check_refname_format(buffer, 0)) { | |
ed378ec7 LT |
554 | strcpy(ref_buffer, buffer); |
555 | ref = ref_buffer; | |
8da19775 JH |
556 | if (flag) |
557 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
558 | continue; |
559 | } | |
ca8db142 | 560 | } |
a876ed83 | 561 | |
7a21632f DS |
562 | /* Is it a directory? */ |
563 | if (S_ISDIR(st.st_mode)) { | |
564 | errno = EISDIR; | |
565 | return NULL; | |
566 | } | |
567 | ||
a876ed83 JH |
568 | /* |
569 | * Anything else, just open it and try to use it as | |
570 | * a ref | |
571 | */ | |
572 | fd = open(path, O_RDONLY); | |
573 | if (fd < 0) | |
574 | return NULL; | |
93d26e4c | 575 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
a876ed83 | 576 | close(fd); |
28775050 MH |
577 | if (len < 0) |
578 | return NULL; | |
579 | while (len && isspace(buffer[len-1])) | |
580 | len--; | |
581 | buffer[len] = '\0'; | |
a876ed83 JH |
582 | |
583 | /* | |
584 | * Is it a symbolic ref? | |
585 | */ | |
28775050 | 586 | if (prefixcmp(buffer, "ref:")) |
a876ed83 | 587 | break; |
55956350 JH |
588 | if (flag) |
589 | *flag |= REF_ISSYMREF; | |
a876ed83 | 590 | buf = buffer + 4; |
28775050 MH |
591 | while (isspace(*buf)) |
592 | buf++; | |
313fb010 | 593 | if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) { |
55956350 JH |
594 | if (flag) |
595 | *flag |= REF_ISBROKEN; | |
313fb010 MH |
596 | return NULL; |
597 | } | |
28775050 | 598 | ref = strcpy(ref_buffer, buf); |
8a65ff76 | 599 | } |
f989fea0 MH |
600 | /* Please note that FETCH_HEAD has a second line containing other data. */ |
601 | if (get_sha1_hex(buffer, sha1) || (buffer[40] != '\0' && !isspace(buffer[40]))) { | |
55956350 JH |
602 | if (flag) |
603 | *flag |= REF_ISBROKEN; | |
a876ed83 | 604 | return NULL; |
629cd3ac | 605 | } |
ed378ec7 | 606 | return ref; |
a876ed83 JH |
607 | } |
608 | ||
d08bae7e IL |
609 | /* The argument to filter_refs */ |
610 | struct ref_filter { | |
611 | const char *pattern; | |
612 | each_ref_fn *fn; | |
613 | void *cb_data; | |
614 | }; | |
615 | ||
c6893323 | 616 | int read_ref_full(const char *ref, unsigned char *sha1, int reading, int *flags) |
a876ed83 | 617 | { |
c6893323 | 618 | if (resolve_ref(ref, sha1, reading, flags)) |
a876ed83 JH |
619 | return 0; |
620 | return -1; | |
8a65ff76 LT |
621 | } |
622 | ||
c6893323 NTND |
623 | int read_ref(const char *ref, unsigned char *sha1) |
624 | { | |
625 | return read_ref_full(ref, sha1, 1, NULL); | |
626 | } | |
627 | ||
f8948e2f | 628 | #define DO_FOR_EACH_INCLUDE_BROKEN 01 |
ef06b918 | 629 | static int do_one_ref(const char *base, each_ref_fn fn, int trim, |
e9c4c111 | 630 | int flags, void *cb_data, struct ref_entry *entry) |
ef06b918 | 631 | { |
b3cfc406 | 632 | if (prefixcmp(entry->name, base)) |
ef06b918 | 633 | return 0; |
e01de1c9 | 634 | |
f8948e2f | 635 | if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) { |
98ac34b2 JH |
636 | if (entry->flag & REF_ISBROKEN) |
637 | return 0; /* ignore broken refs e.g. dangling symref */ | |
f8948e2f JH |
638 | if (!has_sha1_file(entry->sha1)) { |
639 | error("%s does not point to a valid object!", entry->name); | |
640 | return 0; | |
641 | } | |
ef06b918 | 642 | } |
0ae91be0 | 643 | current_ref = entry; |
ef06b918 JH |
644 | return fn(entry->name + trim, entry->sha1, entry->flag, cb_data); |
645 | } | |
646 | ||
d08bae7e IL |
647 | static int filter_refs(const char *ref, const unsigned char *sha, int flags, |
648 | void *data) | |
649 | { | |
650 | struct ref_filter *filter = (struct ref_filter *)data; | |
651 | if (fnmatch(filter->pattern, ref, 0)) | |
652 | return 0; | |
653 | return filter->fn(ref, sha, flags, filter->cb_data); | |
654 | } | |
655 | ||
cf0adba7 JH |
656 | int peel_ref(const char *ref, unsigned char *sha1) |
657 | { | |
658 | int flag; | |
659 | unsigned char base[20]; | |
660 | struct object *o; | |
661 | ||
0ae91be0 SP |
662 | if (current_ref && (current_ref->name == ref |
663 | || !strcmp(current_ref->name, ref))) { | |
664 | if (current_ref->flag & REF_KNOWS_PEELED) { | |
665 | hashcpy(sha1, current_ref->peeled); | |
666 | return 0; | |
667 | } | |
668 | hashcpy(base, current_ref->sha1); | |
669 | goto fallback; | |
670 | } | |
671 | ||
c6893323 | 672 | if (read_ref_full(ref, base, 1, &flag)) |
cf0adba7 JH |
673 | return -1; |
674 | ||
675 | if ((flag & REF_ISPACKED)) { | |
e9c4c111 JP |
676 | struct ref_array *array = get_packed_refs(NULL); |
677 | struct ref_entry *r = search_ref_array(array, ref); | |
cf0adba7 | 678 | |
e9c4c111 JP |
679 | if (r != NULL && r->flag & REF_KNOWS_PEELED) { |
680 | hashcpy(sha1, r->peeled); | |
681 | return 0; | |
cf0adba7 | 682 | } |
cf0adba7 JH |
683 | } |
684 | ||
0ae91be0 | 685 | fallback: |
cf0adba7 | 686 | o = parse_object(base); |
8c87dc77 | 687 | if (o && o->type == OBJ_TAG) { |
cf0adba7 JH |
688 | o = deref_tag(o, ref, 0); |
689 | if (o) { | |
690 | hashcpy(sha1, o->sha1); | |
691 | return 0; | |
692 | } | |
693 | } | |
694 | return -1; | |
695 | } | |
696 | ||
0bad611b HV |
697 | static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn, |
698 | int trim, int flags, void *cb_data) | |
8a65ff76 | 699 | { |
e9c4c111 JP |
700 | int retval = 0, i, p = 0, l = 0; |
701 | struct ref_array *packed = get_packed_refs(submodule); | |
702 | struct ref_array *loose = get_loose_refs(submodule); | |
8a65ff76 | 703 | |
e9c4c111 | 704 | struct ref_array *extra = &extra_refs; |
e142a3c6 | 705 | |
e9c4c111 JP |
706 | for (i = 0; i < extra->nr; i++) |
707 | retval = do_one_ref(base, fn, trim, flags, cb_data, extra->refs[i]); | |
e142a3c6 | 708 | |
e9c4c111 JP |
709 | while (p < packed->nr && l < loose->nr) { |
710 | struct ref_entry *entry; | |
711 | int cmp = strcmp(packed->refs[p]->name, loose->refs[l]->name); | |
e1e22e37 | 712 | if (!cmp) { |
e9c4c111 | 713 | p++; |
e1e22e37 | 714 | continue; |
6cada6a9 | 715 | } |
e1e22e37 | 716 | if (cmp > 0) { |
e9c4c111 | 717 | entry = loose->refs[l++]; |
e1e22e37 | 718 | } else { |
e9c4c111 | 719 | entry = packed->refs[p++]; |
e1e22e37 | 720 | } |
f8948e2f | 721 | retval = do_one_ref(base, fn, trim, flags, cb_data, entry); |
e1e22e37 | 722 | if (retval) |
0ae91be0 | 723 | goto end_each; |
e1e22e37 | 724 | } |
8a65ff76 | 725 | |
e9c4c111 JP |
726 | if (l < loose->nr) { |
727 | p = l; | |
728 | packed = loose; | |
729 | } | |
730 | ||
731 | for (; p < packed->nr; p++) { | |
732 | retval = do_one_ref(base, fn, trim, flags, cb_data, packed->refs[p]); | |
ef06b918 | 733 | if (retval) |
0ae91be0 | 734 | goto end_each; |
8a65ff76 | 735 | } |
0ae91be0 SP |
736 | |
737 | end_each: | |
738 | current_ref = NULL; | |
739 | return retval; | |
8a65ff76 LT |
740 | } |
741 | ||
0bad611b HV |
742 | |
743 | static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data) | |
723c31fe LT |
744 | { |
745 | unsigned char sha1[20]; | |
8da19775 JH |
746 | int flag; |
747 | ||
0bad611b HV |
748 | if (submodule) { |
749 | if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0) | |
750 | return fn("HEAD", sha1, 0, cb_data); | |
751 | ||
752 | return 0; | |
753 | } | |
754 | ||
c6893323 | 755 | if (!read_ref_full("HEAD", sha1, 1, &flag)) |
8da19775 | 756 | return fn("HEAD", sha1, flag, cb_data); |
0bad611b | 757 | |
2f34ba32 | 758 | return 0; |
723c31fe LT |
759 | } |
760 | ||
0bad611b HV |
761 | int head_ref(each_ref_fn fn, void *cb_data) |
762 | { | |
763 | return do_head_ref(NULL, fn, cb_data); | |
764 | } | |
765 | ||
9ef6aeb0 HV |
766 | int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
767 | { | |
768 | return do_head_ref(submodule, fn, cb_data); | |
769 | } | |
770 | ||
cb5d709f | 771 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 772 | { |
b3cfc406 | 773 | return do_for_each_ref(NULL, "", fn, 0, 0, cb_data); |
a62be77f SE |
774 | } |
775 | ||
9ef6aeb0 HV |
776 | int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
777 | { | |
b3cfc406 | 778 | return do_for_each_ref(submodule, "", fn, 0, 0, cb_data); |
a62be77f SE |
779 | } |
780 | ||
2a8177b6 CC |
781 | int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data) |
782 | { | |
0bad611b | 783 | return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data); |
2a8177b6 CC |
784 | } |
785 | ||
9ef6aeb0 HV |
786 | int for_each_ref_in_submodule(const char *submodule, const char *prefix, |
787 | each_ref_fn fn, void *cb_data) | |
788 | { | |
789 | return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data); | |
2a8177b6 CC |
790 | } |
791 | ||
cb5d709f | 792 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 793 | { |
2a8177b6 | 794 | return for_each_ref_in("refs/tags/", fn, cb_data); |
a62be77f SE |
795 | } |
796 | ||
9ef6aeb0 HV |
797 | int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
798 | { | |
799 | return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data); | |
800 | } | |
801 | ||
cb5d709f | 802 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 803 | { |
2a8177b6 | 804 | return for_each_ref_in("refs/heads/", fn, cb_data); |
a62be77f SE |
805 | } |
806 | ||
9ef6aeb0 HV |
807 | int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
808 | { | |
809 | return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data); | |
810 | } | |
811 | ||
cb5d709f | 812 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 813 | { |
2a8177b6 | 814 | return for_each_ref_in("refs/remotes/", fn, cb_data); |
f8948e2f JH |
815 | } |
816 | ||
9ef6aeb0 HV |
817 | int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
818 | { | |
819 | return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data); | |
820 | } | |
821 | ||
29268700 CC |
822 | int for_each_replace_ref(each_ref_fn fn, void *cb_data) |
823 | { | |
0bad611b | 824 | return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data); |
29268700 CC |
825 | } |
826 | ||
a1bea2c1 JT |
827 | int head_ref_namespaced(each_ref_fn fn, void *cb_data) |
828 | { | |
829 | struct strbuf buf = STRBUF_INIT; | |
830 | int ret = 0; | |
831 | unsigned char sha1[20]; | |
832 | int flag; | |
833 | ||
834 | strbuf_addf(&buf, "%sHEAD", get_git_namespace()); | |
c6893323 | 835 | if (!read_ref_full(buf.buf, sha1, 1, &flag)) |
a1bea2c1 JT |
836 | ret = fn(buf.buf, sha1, flag, cb_data); |
837 | strbuf_release(&buf); | |
838 | ||
839 | return ret; | |
840 | } | |
841 | ||
842 | int for_each_namespaced_ref(each_ref_fn fn, void *cb_data) | |
843 | { | |
844 | struct strbuf buf = STRBUF_INIT; | |
845 | int ret; | |
846 | strbuf_addf(&buf, "%srefs/", get_git_namespace()); | |
847 | ret = do_for_each_ref(NULL, buf.buf, fn, 0, 0, cb_data); | |
848 | strbuf_release(&buf); | |
849 | return ret; | |
850 | } | |
851 | ||
b09fe971 IL |
852 | int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, |
853 | const char *prefix, void *cb_data) | |
d08bae7e IL |
854 | { |
855 | struct strbuf real_pattern = STRBUF_INIT; | |
856 | struct ref_filter filter; | |
d08bae7e IL |
857 | int ret; |
858 | ||
b09fe971 | 859 | if (!prefix && prefixcmp(pattern, "refs/")) |
d08bae7e | 860 | strbuf_addstr(&real_pattern, "refs/"); |
b09fe971 IL |
861 | else if (prefix) |
862 | strbuf_addstr(&real_pattern, prefix); | |
d08bae7e IL |
863 | strbuf_addstr(&real_pattern, pattern); |
864 | ||
894a9d33 | 865 | if (!has_glob_specials(pattern)) { |
9517e6b8 | 866 | /* Append implied '/' '*' if not present. */ |
d08bae7e IL |
867 | if (real_pattern.buf[real_pattern.len - 1] != '/') |
868 | strbuf_addch(&real_pattern, '/'); | |
869 | /* No need to check for '*', there is none. */ | |
870 | strbuf_addch(&real_pattern, '*'); | |
871 | } | |
872 | ||
873 | filter.pattern = real_pattern.buf; | |
874 | filter.fn = fn; | |
875 | filter.cb_data = cb_data; | |
876 | ret = for_each_ref(filter_refs, &filter); | |
877 | ||
878 | strbuf_release(&real_pattern); | |
879 | return ret; | |
880 | } | |
881 | ||
b09fe971 IL |
882 | int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data) |
883 | { | |
884 | return for_each_glob_ref_in(fn, pattern, NULL, cb_data); | |
885 | } | |
886 | ||
f8948e2f JH |
887 | int for_each_rawref(each_ref_fn fn, void *cb_data) |
888 | { | |
b3cfc406 | 889 | return do_for_each_ref(NULL, "", fn, 0, |
f8948e2f | 890 | DO_FOR_EACH_INCLUDE_BROKEN, cb_data); |
8a65ff76 LT |
891 | } |
892 | ||
03feddd6 JH |
893 | /* |
894 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
895 | * We do not like it if: | |
896 | * | |
897 | * - any path component of it begins with ".", or | |
898 | * - it has double dots "..", or | |
899 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
900 | * - it ends with a "/". | |
3e262b95 | 901 | * - it ends with ".lock" |
a4c2e699 | 902 | * - it contains a "\" (backslash) |
03feddd6 JH |
903 | */ |
904 | ||
9224b73b | 905 | /* Return true iff ch is not allowed in reference names. */ |
03feddd6 JH |
906 | static inline int bad_ref_char(int ch) |
907 | { | |
f3738c1c | 908 | if (((unsigned) ch) <= ' ' || ch == 0x7f || |
a4c2e699 | 909 | ch == '~' || ch == '^' || ch == ':' || ch == '\\') |
8558fd9e DB |
910 | return 1; |
911 | /* 2.13 Pattern Matching Notation */ | |
9224b73b | 912 | if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */ |
8558fd9e | 913 | return 1; |
8558fd9e | 914 | return 0; |
03feddd6 JH |
915 | } |
916 | ||
49295d4e MH |
917 | /* |
918 | * Try to read one refname component from the front of ref. Return | |
919 | * the length of the component found, or -1 if the component is not | |
920 | * legal. | |
921 | */ | |
dce4bab6 | 922 | static int check_refname_component(const char *ref, int flags) |
95fc7512 | 923 | { |
49295d4e MH |
924 | const char *cp; |
925 | char last = '\0'; | |
03feddd6 | 926 | |
49295d4e MH |
927 | for (cp = ref; ; cp++) { |
928 | char ch = *cp; | |
929 | if (ch == '\0' || ch == '/') | |
930 | break; | |
931 | if (bad_ref_char(ch)) | |
932 | return -1; /* Illegal character in refname. */ | |
933 | if (last == '.' && ch == '.') | |
934 | return -1; /* Refname contains "..". */ | |
935 | if (last == '@' && ch == '{') | |
936 | return -1; /* Refname contains "@{". */ | |
cbdffe40 | 937 | last = ch; |
49295d4e MH |
938 | } |
939 | if (cp == ref) | |
940 | return -1; /* Component has zero length. */ | |
dce4bab6 MH |
941 | if (ref[0] == '.') { |
942 | if (!(flags & REFNAME_DOT_COMPONENT)) | |
943 | return -1; /* Component starts with '.'. */ | |
944 | /* | |
945 | * Even if leading dots are allowed, don't allow "." | |
946 | * as a component (".." is prevented by a rule above). | |
947 | */ | |
948 | if (ref[1] == '\0') | |
949 | return -1; /* Component equals ".". */ | |
950 | } | |
7e9d2fe9 MH |
951 | if (cp - ref >= 5 && !memcmp(cp - 5, ".lock", 5)) |
952 | return -1; /* Refname ends with ".lock". */ | |
49295d4e MH |
953 | return cp - ref; |
954 | } | |
955 | ||
8d9c5010 | 956 | int check_refname_format(const char *ref, int flags) |
95fc7512 | 957 | { |
49295d4e | 958 | int component_len, component_count = 0; |
03feddd6 | 959 | |
03feddd6 | 960 | while (1) { |
49295d4e | 961 | /* We are at the start of a path component. */ |
dce4bab6 | 962 | component_len = check_refname_component(ref, flags); |
49295d4e MH |
963 | if (component_len < 0) { |
964 | if ((flags & REFNAME_REFSPEC_PATTERN) && | |
965 | ref[0] == '*' && | |
966 | (ref[1] == '\0' || ref[1] == '/')) { | |
8d9c5010 MH |
967 | /* Accept one wildcard as a full refname component. */ |
968 | flags &= ~REFNAME_REFSPEC_PATTERN; | |
49295d4e MH |
969 | component_len = 1; |
970 | } else { | |
8d9c5010 | 971 | return -1; |
49295d4e | 972 | } |
03feddd6 | 973 | } |
49295d4e MH |
974 | component_count++; |
975 | if (ref[component_len] == '\0') | |
976 | break; | |
977 | /* Skip to next component. */ | |
978 | ref += component_len + 1; | |
03feddd6 | 979 | } |
49295d4e MH |
980 | |
981 | if (ref[component_len - 1] == '.') | |
982 | return -1; /* Refname ends with '.'. */ | |
49295d4e MH |
983 | if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2) |
984 | return -1; /* Refname has only one component. */ | |
985 | return 0; | |
95fc7512 DB |
986 | } |
987 | ||
4577e483 | 988 | const char *prettify_refname(const char *name) |
a9c37a72 | 989 | { |
a9c37a72 DB |
990 | return name + ( |
991 | !prefixcmp(name, "refs/heads/") ? 11 : | |
992 | !prefixcmp(name, "refs/tags/") ? 10 : | |
993 | !prefixcmp(name, "refs/remotes/") ? 13 : | |
994 | 0); | |
995 | } | |
996 | ||
79803322 SP |
997 | const char *ref_rev_parse_rules[] = { |
998 | "%.*s", | |
999 | "refs/%.*s", | |
1000 | "refs/tags/%.*s", | |
1001 | "refs/heads/%.*s", | |
1002 | "refs/remotes/%.*s", | |
1003 | "refs/remotes/%.*s/HEAD", | |
1004 | NULL | |
1005 | }; | |
1006 | ||
1007 | int refname_match(const char *abbrev_name, const char *full_name, const char **rules) | |
1008 | { | |
1009 | const char **p; | |
1010 | const int abbrev_name_len = strlen(abbrev_name); | |
1011 | ||
1012 | for (p = rules; *p; p++) { | |
1013 | if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { | |
1014 | return 1; | |
1015 | } | |
1016 | } | |
1017 | ||
1018 | return 0; | |
1019 | } | |
1020 | ||
e5f38ec3 | 1021 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
1022 | const unsigned char *old_sha1, int mustexist) |
1023 | { | |
c6893323 | 1024 | if (read_ref_full(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 1025 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
1026 | unlock_ref(lock); |
1027 | return NULL; | |
1028 | } | |
a89fccd2 | 1029 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 1030 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
1031 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
1032 | unlock_ref(lock); | |
1033 | return NULL; | |
1034 | } | |
1035 | return lock; | |
1036 | } | |
1037 | ||
7155b727 | 1038 | static int remove_empty_directories(const char *file) |
bc7127ef JH |
1039 | { |
1040 | /* we want to create a file but there is a directory there; | |
1041 | * if that is an empty directory (or a directory that contains | |
1042 | * only empty directories), remove them. | |
1043 | */ | |
7155b727 JS |
1044 | struct strbuf path; |
1045 | int result; | |
bc7127ef | 1046 | |
7155b727 JS |
1047 | strbuf_init(&path, 20); |
1048 | strbuf_addstr(&path, file); | |
1049 | ||
a0f4afbe | 1050 | result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY); |
7155b727 JS |
1051 | |
1052 | strbuf_release(&path); | |
1053 | ||
1054 | return result; | |
bc7127ef JH |
1055 | } |
1056 | ||
c976d415 | 1057 | static int is_refname_available(const char *ref, const char *oldref, |
e9c4c111 | 1058 | struct ref_array *array, int quiet) |
c976d415 | 1059 | { |
e9c4c111 JP |
1060 | int i, namlen = strlen(ref); /* e.g. 'foo/bar' */ |
1061 | for (i = 0; i < array->nr; i++ ) { | |
1062 | struct ref_entry *entry = array->refs[i]; | |
1063 | /* entry->name could be 'foo' or 'foo/bar/baz' */ | |
1064 | if (!oldref || strcmp(oldref, entry->name)) { | |
1065 | int len = strlen(entry->name); | |
c976d415 | 1066 | int cmplen = (namlen < len) ? namlen : len; |
e9c4c111 JP |
1067 | const char *lead = (namlen < len) ? entry->name : ref; |
1068 | if (!strncmp(ref, entry->name, cmplen) && | |
c976d415 LH |
1069 | lead[cmplen] == '/') { |
1070 | if (!quiet) | |
1071 | error("'%s' exists; cannot create '%s'", | |
e9c4c111 | 1072 | entry->name, ref); |
c976d415 LH |
1073 | return 0; |
1074 | } | |
1075 | } | |
c976d415 LH |
1076 | } |
1077 | return 1; | |
1078 | } | |
1079 | ||
ff74f7f1 JH |
1080 | /* |
1081 | * *string and *len will only be substituted, and *string returned (for | |
1082 | * later free()ing) if the string passed in is a magic short-hand form | |
1083 | * to name a branch. | |
1084 | */ | |
1085 | static char *substitute_branch_name(const char **string, int *len) | |
1086 | { | |
1087 | struct strbuf buf = STRBUF_INIT; | |
1088 | int ret = interpret_branch_name(*string, &buf); | |
1089 | ||
1090 | if (ret == *len) { | |
1091 | size_t size; | |
1092 | *string = strbuf_detach(&buf, &size); | |
1093 | *len = size; | |
1094 | return (char *)*string; | |
1095 | } | |
1096 | ||
1097 | return NULL; | |
1098 | } | |
1099 | ||
1100 | int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref) | |
1101 | { | |
1102 | char *last_branch = substitute_branch_name(&str, &len); | |
1103 | const char **p, *r; | |
1104 | int refs_found = 0; | |
1105 | ||
1106 | *ref = NULL; | |
1107 | for (p = ref_rev_parse_rules; *p; p++) { | |
1108 | char fullref[PATH_MAX]; | |
1109 | unsigned char sha1_from_ref[20]; | |
1110 | unsigned char *this_result; | |
1111 | int flag; | |
1112 | ||
1113 | this_result = refs_found ? sha1_from_ref : sha1; | |
1114 | mksnpath(fullref, sizeof(fullref), *p, len, str); | |
1115 | r = resolve_ref(fullref, this_result, 1, &flag); | |
1116 | if (r) { | |
1117 | if (!refs_found++) | |
1118 | *ref = xstrdup(r); | |
1119 | if (!warn_ambiguous_refs) | |
1120 | break; | |
55956350 | 1121 | } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) { |
ff74f7f1 | 1122 | warning("ignoring dangling symref %s.", fullref); |
55956350 JH |
1123 | } else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) { |
1124 | warning("ignoring broken ref %s.", fullref); | |
1125 | } | |
ff74f7f1 JH |
1126 | } |
1127 | free(last_branch); | |
1128 | return refs_found; | |
1129 | } | |
1130 | ||
1131 | int dwim_log(const char *str, int len, unsigned char *sha1, char **log) | |
1132 | { | |
1133 | char *last_branch = substitute_branch_name(&str, &len); | |
1134 | const char **p; | |
1135 | int logs_found = 0; | |
1136 | ||
1137 | *log = NULL; | |
1138 | for (p = ref_rev_parse_rules; *p; p++) { | |
1139 | struct stat st; | |
1140 | unsigned char hash[20]; | |
1141 | char path[PATH_MAX]; | |
1142 | const char *ref, *it; | |
1143 | ||
1144 | mksnpath(path, sizeof(path), *p, len, str); | |
1145 | ref = resolve_ref(path, hash, 1, NULL); | |
1146 | if (!ref) | |
1147 | continue; | |
1148 | if (!stat(git_path("logs/%s", path), &st) && | |
1149 | S_ISREG(st.st_mode)) | |
1150 | it = path; | |
1151 | else if (strcmp(ref, path) && | |
1152 | !stat(git_path("logs/%s", ref), &st) && | |
1153 | S_ISREG(st.st_mode)) | |
1154 | it = ref; | |
1155 | else | |
1156 | continue; | |
1157 | if (!logs_found++) { | |
1158 | *log = xstrdup(it); | |
1159 | hashcpy(sha1, hash); | |
1160 | } | |
1161 | if (!warn_ambiguous_refs) | |
1162 | break; | |
1163 | } | |
1164 | free(last_branch); | |
1165 | return logs_found; | |
1166 | } | |
1167 | ||
68db31cc | 1168 | static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p) |
4bd18c43 | 1169 | { |
434cd0cd | 1170 | char *ref_file; |
ed378ec7 | 1171 | const char *orig_ref = ref; |
4bd18c43 | 1172 | struct ref_lock *lock; |
5cc3cef9 | 1173 | int last_errno = 0; |
acd3b9ec | 1174 | int type, lflags; |
4431fcc4 | 1175 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
5bdd8d4a | 1176 | int missing = 0; |
4bd18c43 SP |
1177 | |
1178 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
1179 | lock->lock_fd = -1; | |
1180 | ||
68db31cc | 1181 | ref = resolve_ref(ref, lock->old_sha1, mustexist, &type); |
bc7127ef JH |
1182 | if (!ref && errno == EISDIR) { |
1183 | /* we are trying to lock foo but we used to | |
1184 | * have foo/bar which now does not exist; | |
1185 | * it is normal for the empty directory 'foo' | |
1186 | * to remain. | |
1187 | */ | |
1188 | ref_file = git_path("%s", orig_ref); | |
5cc3cef9 JH |
1189 | if (remove_empty_directories(ref_file)) { |
1190 | last_errno = errno; | |
1191 | error("there are still refs under '%s'", orig_ref); | |
1192 | goto error_return; | |
1193 | } | |
68db31cc | 1194 | ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type); |
bc7127ef | 1195 | } |
68db31cc SV |
1196 | if (type_p) |
1197 | *type_p = type; | |
ed378ec7 | 1198 | if (!ref) { |
5cc3cef9 | 1199 | last_errno = errno; |
818f477c | 1200 | error("unable to resolve reference %s: %s", |
ed378ec7 | 1201 | orig_ref, strerror(errno)); |
5cc3cef9 | 1202 | goto error_return; |
4bd18c43 | 1203 | } |
5bdd8d4a | 1204 | missing = is_null_sha1(lock->old_sha1); |
c976d415 LH |
1205 | /* When the ref did not exist and we are creating it, |
1206 | * make sure there is no existing ref that is packed | |
1207 | * whose name begins with our refname, nor a ref whose | |
1208 | * name is a proper prefix of our refname. | |
1209 | */ | |
5bdd8d4a | 1210 | if (missing && |
0bad611b | 1211 | !is_refname_available(ref, NULL, get_packed_refs(NULL), 0)) { |
f475e08e | 1212 | last_errno = ENOTDIR; |
c976d415 | 1213 | goto error_return; |
f475e08e | 1214 | } |
22a3844e | 1215 | |
c33d5174 | 1216 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 1217 | |
acd3b9ec JH |
1218 | lflags = LOCK_DIE_ON_ERROR; |
1219 | if (flags & REF_NODEREF) { | |
68db31cc | 1220 | ref = orig_ref; |
acd3b9ec JH |
1221 | lflags |= LOCK_NODEREF; |
1222 | } | |
434cd0cd | 1223 | lock->ref_name = xstrdup(ref); |
1655707c | 1224 | lock->orig_ref_name = xstrdup(orig_ref); |
7c1a278d | 1225 | ref_file = git_path("%s", ref); |
5bdd8d4a | 1226 | if (missing) |
68db31cc SV |
1227 | lock->force_write = 1; |
1228 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
1229 | lock->force_write = 1; | |
4bd18c43 | 1230 | |
5cc3cef9 JH |
1231 | if (safe_create_leading_directories(ref_file)) { |
1232 | last_errno = errno; | |
1233 | error("unable to create directory for %s", ref_file); | |
1234 | goto error_return; | |
1235 | } | |
4bd18c43 | 1236 | |
acd3b9ec | 1237 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags); |
4bd18c43 | 1238 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; |
5cc3cef9 JH |
1239 | |
1240 | error_return: | |
1241 | unlock_ref(lock); | |
1242 | errno = last_errno; | |
1243 | return NULL; | |
4bd18c43 SP |
1244 | } |
1245 | ||
4431fcc4 | 1246 | struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1) |
95fc7512 | 1247 | { |
53cce84c | 1248 | char refpath[PATH_MAX]; |
8d9c5010 | 1249 | if (check_refname_format(ref, 0)) |
4bd18c43 | 1250 | return NULL; |
53cce84c | 1251 | strcpy(refpath, mkpath("refs/%s", ref)); |
68db31cc | 1252 | return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL); |
4bd18c43 SP |
1253 | } |
1254 | ||
68db31cc | 1255 | struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags) |
4bd18c43 | 1256 | { |
8d9c5010 | 1257 | if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL)) |
257f3020 | 1258 | return NULL; |
8d9c5010 | 1259 | return lock_ref_sha1_basic(ref, old_sha1, flags, NULL); |
c0277d15 JH |
1260 | } |
1261 | ||
26a063a1 JH |
1262 | static struct lock_file packlock; |
1263 | ||
c0277d15 JH |
1264 | static int repack_without_ref(const char *refname) |
1265 | { | |
e9c4c111 JP |
1266 | struct ref_array *packed; |
1267 | struct ref_entry *ref; | |
1268 | int fd, i; | |
c0277d15 | 1269 | |
e9c4c111 JP |
1270 | packed = get_packed_refs(NULL); |
1271 | ref = search_ref_array(packed, refname); | |
1272 | if (ref == NULL) | |
c0277d15 | 1273 | return 0; |
c0277d15 | 1274 | fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0); |
1b018fd9 MV |
1275 | if (fd < 0) { |
1276 | unable_to_lock_error(git_path("packed-refs"), errno); | |
c0277d15 | 1277 | return error("cannot delete '%s' from packed refs", refname); |
1b018fd9 | 1278 | } |
c0277d15 | 1279 | |
e9c4c111 | 1280 | for (i = 0; i < packed->nr; i++) { |
c0277d15 JH |
1281 | char line[PATH_MAX + 100]; |
1282 | int len; | |
1283 | ||
e9c4c111 JP |
1284 | ref = packed->refs[i]; |
1285 | ||
1286 | if (!strcmp(refname, ref->name)) | |
c0277d15 JH |
1287 | continue; |
1288 | len = snprintf(line, sizeof(line), "%s %s\n", | |
e9c4c111 | 1289 | sha1_to_hex(ref->sha1), ref->name); |
c0277d15 JH |
1290 | /* this should not happen but just being defensive */ |
1291 | if (len > sizeof(line)) | |
e9c4c111 | 1292 | die("too long a refname '%s'", ref->name); |
c0277d15 JH |
1293 | write_or_die(fd, line, len); |
1294 | } | |
1295 | return commit_lock_file(&packlock); | |
1296 | } | |
1297 | ||
eca35a25 | 1298 | int delete_ref(const char *refname, const unsigned char *sha1, int delopt) |
c0277d15 JH |
1299 | { |
1300 | struct ref_lock *lock; | |
eca35a25 | 1301 | int err, i = 0, ret = 0, flag = 0; |
c0277d15 | 1302 | |
68db31cc | 1303 | lock = lock_ref_sha1_basic(refname, sha1, 0, &flag); |
c0277d15 JH |
1304 | if (!lock) |
1305 | return 1; | |
045a476f | 1306 | if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) { |
c0277d15 | 1307 | /* loose */ |
eca35a25 MV |
1308 | const char *path; |
1309 | ||
1310 | if (!(delopt & REF_NODEREF)) { | |
1311 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
1312 | lock->lk->filename[i] = 0; | |
1313 | path = lock->lk->filename; | |
1314 | } else { | |
9db56f71 | 1315 | path = git_path("%s", refname); |
eca35a25 | 1316 | } |
691f1a28 AR |
1317 | err = unlink_or_warn(path); |
1318 | if (err && errno != ENOENT) | |
c0277d15 | 1319 | ret = 1; |
691f1a28 | 1320 | |
eca35a25 MV |
1321 | if (!(delopt & REF_NODEREF)) |
1322 | lock->lk->filename[i] = '.'; | |
c0277d15 JH |
1323 | } |
1324 | /* removing the loose one could have resurrected an earlier | |
1325 | * packed one. Also, if it was not loose we need to repack | |
1326 | * without it. | |
1327 | */ | |
1328 | ret |= repack_without_ref(refname); | |
1329 | ||
691f1a28 | 1330 | unlink_or_warn(git_path("logs/%s", lock->ref_name)); |
3870a0d1 | 1331 | invalidate_ref_cache(NULL); |
c0277d15 JH |
1332 | unlock_ref(lock); |
1333 | return ret; | |
4bd18c43 SP |
1334 | } |
1335 | ||
765c2258 PH |
1336 | /* |
1337 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
1338 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
1339 | * | |
1340 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
1341 | * live into logs/refs. | |
1342 | */ | |
1343 | #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log" | |
1344 | ||
678d0f4c | 1345 | int rename_ref(const char *oldref, const char *newref, const char *logmsg) |
c976d415 | 1346 | { |
c976d415 LH |
1347 | unsigned char sha1[20], orig_sha1[20]; |
1348 | int flag = 0, logmoved = 0; | |
1349 | struct ref_lock *lock; | |
c976d415 | 1350 | struct stat loginfo; |
16c2bfbb | 1351 | int log = !lstat(git_path("logs/%s", oldref), &loginfo); |
eca35a25 | 1352 | const char *symref = NULL; |
c976d415 | 1353 | |
450d4c0f | 1354 | if (log && S_ISLNK(loginfo.st_mode)) |
c976d415 LH |
1355 | return error("reflog for %s is a symlink", oldref); |
1356 | ||
eca35a25 MV |
1357 | symref = resolve_ref(oldref, orig_sha1, 1, &flag); |
1358 | if (flag & REF_ISSYMREF) | |
fa58186c MV |
1359 | return error("refname %s is a symbolic ref, renaming it is not supported", |
1360 | oldref); | |
eca35a25 | 1361 | if (!symref) |
c976d415 LH |
1362 | return error("refname %s not found", oldref); |
1363 | ||
0bad611b | 1364 | if (!is_refname_available(newref, oldref, get_packed_refs(NULL), 0)) |
c976d415 LH |
1365 | return 1; |
1366 | ||
0bad611b | 1367 | if (!is_refname_available(newref, oldref, get_loose_refs(NULL), 0)) |
c976d415 LH |
1368 | return 1; |
1369 | ||
765c2258 PH |
1370 | if (log && rename(git_path("logs/%s", oldref), git_path(TMP_RENAMED_LOG))) |
1371 | return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s", | |
c976d415 LH |
1372 | oldref, strerror(errno)); |
1373 | ||
eca35a25 | 1374 | if (delete_ref(oldref, orig_sha1, REF_NODEREF)) { |
c976d415 LH |
1375 | error("unable to delete old %s", oldref); |
1376 | goto rollback; | |
1377 | } | |
1378 | ||
c6893323 NTND |
1379 | if (!read_ref_full(newref, sha1, 1, &flag) && |
1380 | delete_ref(newref, sha1, REF_NODEREF)) { | |
c976d415 LH |
1381 | if (errno==EISDIR) { |
1382 | if (remove_empty_directories(git_path("%s", newref))) { | |
1383 | error("Directory not empty: %s", newref); | |
1384 | goto rollback; | |
1385 | } | |
1386 | } else { | |
1387 | error("unable to delete existing %s", newref); | |
1388 | goto rollback; | |
1389 | } | |
1390 | } | |
1391 | ||
1392 | if (log && safe_create_leading_directories(git_path("logs/%s", newref))) { | |
1393 | error("unable to create directory for %s", newref); | |
1394 | goto rollback; | |
1395 | } | |
1396 | ||
1397 | retry: | |
765c2258 | 1398 | if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newref))) { |
d9e74d57 JR |
1399 | if (errno==EISDIR || errno==ENOTDIR) { |
1400 | /* | |
1401 | * rename(a, b) when b is an existing | |
1402 | * directory ought to result in ISDIR, but | |
1403 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
1404 | */ | |
c976d415 LH |
1405 | if (remove_empty_directories(git_path("logs/%s", newref))) { |
1406 | error("Directory not empty: logs/%s", newref); | |
1407 | goto rollback; | |
1408 | } | |
1409 | goto retry; | |
1410 | } else { | |
765c2258 | 1411 | error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s", |
c976d415 LH |
1412 | newref, strerror(errno)); |
1413 | goto rollback; | |
1414 | } | |
1415 | } | |
1416 | logmoved = log; | |
1417 | ||
68db31cc | 1418 | lock = lock_ref_sha1_basic(newref, NULL, 0, NULL); |
c976d415 LH |
1419 | if (!lock) { |
1420 | error("unable to lock %s for update", newref); | |
1421 | goto rollback; | |
1422 | } | |
c976d415 LH |
1423 | lock->force_write = 1; |
1424 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 1425 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
c976d415 LH |
1426 | error("unable to write current sha1 into %s", newref); |
1427 | goto rollback; | |
1428 | } | |
1429 | ||
1430 | return 0; | |
1431 | ||
1432 | rollback: | |
68db31cc | 1433 | lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL); |
c976d415 LH |
1434 | if (!lock) { |
1435 | error("unable to lock %s for rollback", oldref); | |
1436 | goto rollbacklog; | |
1437 | } | |
1438 | ||
1439 | lock->force_write = 1; | |
1440 | flag = log_all_ref_updates; | |
1441 | log_all_ref_updates = 0; | |
1442 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
1443 | error("unable to write current sha1 into %s", oldref); | |
1444 | log_all_ref_updates = flag; | |
1445 | ||
1446 | rollbacklog: | |
1447 | if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref))) | |
1448 | error("unable to restore logfile %s from %s: %s", | |
1449 | oldref, newref, strerror(errno)); | |
1450 | if (!logmoved && log && | |
765c2258 PH |
1451 | rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldref))) |
1452 | error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s", | |
c976d415 LH |
1453 | oldref, strerror(errno)); |
1454 | ||
1455 | return 1; | |
1456 | } | |
1457 | ||
435fc852 | 1458 | int close_ref(struct ref_lock *lock) |
b531394d BC |
1459 | { |
1460 | if (close_lock_file(lock->lk)) | |
1461 | return -1; | |
1462 | lock->lock_fd = -1; | |
1463 | return 0; | |
1464 | } | |
1465 | ||
435fc852 | 1466 | int commit_ref(struct ref_lock *lock) |
b531394d BC |
1467 | { |
1468 | if (commit_lock_file(lock->lk)) | |
1469 | return -1; | |
1470 | lock->lock_fd = -1; | |
1471 | return 0; | |
1472 | } | |
1473 | ||
e5f38ec3 | 1474 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 | 1475 | { |
4ed7cd3a BC |
1476 | /* Do not free lock->lk -- atexit() still looks at them */ |
1477 | if (lock->lk) | |
1478 | rollback_lock_file(lock->lk); | |
434cd0cd | 1479 | free(lock->ref_name); |
1655707c | 1480 | free(lock->orig_ref_name); |
4bd18c43 SP |
1481 | free(lock); |
1482 | } | |
1483 | ||
0ec29a47 JH |
1484 | /* |
1485 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
1486 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
1487 | * because reflog file is one line per entry. | |
1488 | */ | |
1489 | static int copy_msg(char *buf, const char *msg) | |
1490 | { | |
1491 | char *cp = buf; | |
1492 | char c; | |
1493 | int wasspace = 1; | |
1494 | ||
1495 | *cp++ = '\t'; | |
1496 | while ((c = *msg++)) { | |
1497 | if (wasspace && isspace(c)) | |
1498 | continue; | |
1499 | wasspace = isspace(c); | |
1500 | if (wasspace) | |
1501 | c = ' '; | |
1502 | *cp++ = c; | |
1503 | } | |
1504 | while (buf < cp && isspace(cp[-1])) | |
1505 | cp--; | |
1506 | *cp++ = '\n'; | |
1507 | return cp - buf; | |
1508 | } | |
1509 | ||
157aaea5 | 1510 | int log_ref_setup(const char *ref_name, char *logfile, int bufsize) |
6de08ae6 | 1511 | { |
859c3017 | 1512 | int logfd, oflags = O_APPEND | O_WRONLY; |
9a13f0b7 | 1513 | |
157aaea5 | 1514 | git_snpath(logfile, bufsize, "logs/%s", ref_name); |
4057deb5 | 1515 | if (log_all_ref_updates && |
cc44c765 JH |
1516 | (!prefixcmp(ref_name, "refs/heads/") || |
1517 | !prefixcmp(ref_name, "refs/remotes/") || | |
b2e256b0 | 1518 | !prefixcmp(ref_name, "refs/notes/") || |
bd104db1 | 1519 | !strcmp(ref_name, "HEAD"))) { |
157aaea5 | 1520 | if (safe_create_leading_directories(logfile) < 0) |
6de08ae6 | 1521 | return error("unable to create directory for %s", |
157aaea5 | 1522 | logfile); |
6de08ae6 SP |
1523 | oflags |= O_CREAT; |
1524 | } | |
1525 | ||
157aaea5 | 1526 | logfd = open(logfile, oflags, 0666); |
6de08ae6 | 1527 | if (logfd < 0) { |
1974bf62 | 1528 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 1529 | return 0; |
3b463c3f JH |
1530 | |
1531 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
157aaea5 | 1532 | if (remove_empty_directories(logfile)) { |
3b463c3f | 1533 | return error("There are still logs under '%s'", |
157aaea5 | 1534 | logfile); |
3b463c3f | 1535 | } |
157aaea5 | 1536 | logfd = open(logfile, oflags, 0666); |
3b463c3f JH |
1537 | } |
1538 | ||
1539 | if (logfd < 0) | |
1540 | return error("Unable to append to %s: %s", | |
157aaea5 | 1541 | logfile, strerror(errno)); |
6de08ae6 SP |
1542 | } |
1543 | ||
157aaea5 | 1544 | adjust_shared_perm(logfile); |
859c3017 EM |
1545 | close(logfd); |
1546 | return 0; | |
1547 | } | |
443b92b6 | 1548 | |
859c3017 EM |
1549 | static int log_ref_write(const char *ref_name, const unsigned char *old_sha1, |
1550 | const unsigned char *new_sha1, const char *msg) | |
1551 | { | |
1552 | int logfd, result, written, oflags = O_APPEND | O_WRONLY; | |
1553 | unsigned maxlen, len; | |
1554 | int msglen; | |
157aaea5 | 1555 | char log_file[PATH_MAX]; |
859c3017 EM |
1556 | char *logrec; |
1557 | const char *committer; | |
1558 | ||
1559 | if (log_all_ref_updates < 0) | |
1560 | log_all_ref_updates = !is_bare_repository(); | |
1561 | ||
157aaea5 | 1562 | result = log_ref_setup(ref_name, log_file, sizeof(log_file)); |
859c3017 EM |
1563 | if (result) |
1564 | return result; | |
1565 | ||
1566 | logfd = open(log_file, oflags); | |
1567 | if (logfd < 0) | |
1568 | return 0; | |
0ec29a47 | 1569 | msglen = msg ? strlen(msg) : 0; |
774751a8 | 1570 | committer = git_committer_info(0); |
8ac65937 JH |
1571 | maxlen = strlen(committer) + msglen + 100; |
1572 | logrec = xmalloc(maxlen); | |
1573 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
1574 | sha1_to_hex(old_sha1), |
1575 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
1576 | committer); |
1577 | if (msglen) | |
0ec29a47 | 1578 | len += copy_msg(logrec + len - 1, msg) - 1; |
93822c22 | 1579 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 | 1580 | free(logrec); |
91c8d590 | 1581 | if (close(logfd) != 0 || written != len) |
9a13f0b7 | 1582 | return error("Unable to append to %s", log_file); |
6de08ae6 SP |
1583 | return 0; |
1584 | } | |
1585 | ||
c3b0dec5 LT |
1586 | static int is_branch(const char *refname) |
1587 | { | |
1588 | return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/"); | |
1589 | } | |
1590 | ||
4bd18c43 SP |
1591 | int write_ref_sha1(struct ref_lock *lock, |
1592 | const unsigned char *sha1, const char *logmsg) | |
1593 | { | |
1594 | static char term = '\n'; | |
c3b0dec5 | 1595 | struct object *o; |
4bd18c43 SP |
1596 | |
1597 | if (!lock) | |
95fc7512 | 1598 | return -1; |
a89fccd2 | 1599 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
1600 | unlock_ref(lock); |
1601 | return 0; | |
95fc7512 | 1602 | } |
c3b0dec5 LT |
1603 | o = parse_object(sha1); |
1604 | if (!o) { | |
7be8b3ba | 1605 | error("Trying to write ref %s with nonexistent object %s", |
c3b0dec5 LT |
1606 | lock->ref_name, sha1_to_hex(sha1)); |
1607 | unlock_ref(lock); | |
1608 | return -1; | |
1609 | } | |
1610 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1611 | error("Trying to write non-commit object %s to branch %s", | |
1612 | sha1_to_hex(sha1), lock->ref_name); | |
1613 | unlock_ref(lock); | |
1614 | return -1; | |
1615 | } | |
93822c22 AW |
1616 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
1617 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
b531394d | 1618 | || close_ref(lock) < 0) { |
c33d5174 | 1619 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
1620 | unlock_ref(lock); |
1621 | return -1; | |
1622 | } | |
8bf90dc9 | 1623 | clear_loose_ref_cache(get_ref_cache(NULL)); |
bd104db1 NP |
1624 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
1625 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
1626 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
1627 | unlock_ref(lock); |
1628 | return -1; | |
1629 | } | |
605fac8b NP |
1630 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
1631 | /* | |
1632 | * Special hack: If a branch is updated directly and HEAD | |
1633 | * points to it (may happen on the remote side of a push | |
1634 | * for example) then logically the HEAD reflog should be | |
1635 | * updated too. | |
1636 | * A generic solution implies reverse symref information, | |
1637 | * but finding all symrefs pointing to the given branch | |
1638 | * would be rather costly for this rare event (the direct | |
1639 | * update of a branch) to be worth it. So let's cheat and | |
1640 | * check with HEAD only which should cover 99% of all usage | |
1641 | * scenarios (even 100% of the default ones). | |
1642 | */ | |
1643 | unsigned char head_sha1[20]; | |
1644 | int head_flag; | |
1645 | const char *head_ref; | |
1646 | head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag); | |
1647 | if (head_ref && (head_flag & REF_ISSYMREF) && | |
1648 | !strcmp(head_ref, lock->ref_name)) | |
1649 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
1650 | } | |
b531394d | 1651 | if (commit_ref(lock)) { |
434cd0cd | 1652 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
1653 | unlock_ref(lock); |
1654 | return -1; | |
1655 | } | |
4bd18c43 SP |
1656 | unlock_ref(lock); |
1657 | return 0; | |
95fc7512 | 1658 | } |
d556fae2 | 1659 | |
8b5157e4 NP |
1660 | int create_symref(const char *ref_target, const char *refs_heads_master, |
1661 | const char *logmsg) | |
41b625b0 NP |
1662 | { |
1663 | const char *lockpath; | |
1664 | char ref[1000]; | |
1665 | int fd, len, written; | |
a4f34cbb | 1666 | char *git_HEAD = git_pathdup("%s", ref_target); |
8b5157e4 NP |
1667 | unsigned char old_sha1[20], new_sha1[20]; |
1668 | ||
1669 | if (logmsg && read_ref(ref_target, old_sha1)) | |
1670 | hashclr(old_sha1); | |
41b625b0 | 1671 | |
d48744d1 JH |
1672 | if (safe_create_leading_directories(git_HEAD) < 0) |
1673 | return error("unable to create directory for %s", git_HEAD); | |
1674 | ||
41b625b0 NP |
1675 | #ifndef NO_SYMLINK_HEAD |
1676 | if (prefer_symlink_refs) { | |
1677 | unlink(git_HEAD); | |
1678 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 1679 | goto done; |
41b625b0 NP |
1680 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
1681 | } | |
1682 | #endif | |
1683 | ||
1684 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
1685 | if (sizeof(ref) <= len) { | |
1686 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 1687 | goto error_free_return; |
41b625b0 NP |
1688 | } |
1689 | lockpath = mkpath("%s.lock", git_HEAD); | |
1690 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
1691 | if (fd < 0) { | |
1692 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 1693 | goto error_free_return; |
41b625b0 NP |
1694 | } |
1695 | written = write_in_full(fd, ref, len); | |
91c8d590 | 1696 | if (close(fd) != 0 || written != len) { |
41b625b0 | 1697 | error("Unable to write to %s", lockpath); |
47fc52e2 | 1698 | goto error_unlink_return; |
41b625b0 NP |
1699 | } |
1700 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 1701 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 1702 | goto error_unlink_return; |
41b625b0 NP |
1703 | } |
1704 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 1705 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 | 1706 | error_unlink_return: |
691f1a28 | 1707 | unlink_or_warn(lockpath); |
47fc52e2 JH |
1708 | error_free_return: |
1709 | free(git_HEAD); | |
1710 | return -1; | |
41b625b0 | 1711 | } |
8b5157e4 | 1712 | |
ee96d11b | 1713 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 1714 | done: |
ee96d11b | 1715 | #endif |
8b5157e4 NP |
1716 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
1717 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
1718 | ||
47fc52e2 | 1719 | free(git_HEAD); |
41b625b0 NP |
1720 | return 0; |
1721 | } | |
1722 | ||
16d7cc90 JH |
1723 | static char *ref_msg(const char *line, const char *endp) |
1724 | { | |
1725 | const char *ep; | |
16d7cc90 | 1726 | line += 82; |
182af834 PH |
1727 | ep = memchr(line, '\n', endp - line); |
1728 | if (!ep) | |
1729 | ep = endp; | |
1730 | return xmemdupz(line, ep - line); | |
16d7cc90 JH |
1731 | } |
1732 | ||
1733 | 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 | 1734 | { |
e5229042 | 1735 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 | 1736 | char *tz_c; |
e29cb53a | 1737 | int logfd, tz, reccnt = 0; |
d556fae2 SP |
1738 | struct stat st; |
1739 | unsigned long date; | |
e5229042 | 1740 | unsigned char logged_sha1[20]; |
cb48cb58 | 1741 | void *log_mapped; |
dc49cd76 | 1742 | size_t mapsz; |
d556fae2 SP |
1743 | |
1744 | logfile = git_path("logs/%s", ref); | |
1745 | logfd = open(logfile, O_RDONLY, 0); | |
1746 | if (logfd < 0) | |
d824cbba | 1747 | die_errno("Unable to read log '%s'", logfile); |
d556fae2 SP |
1748 | fstat(logfd, &st); |
1749 | if (!st.st_size) | |
1750 | die("Log %s is empty.", logfile); | |
dc49cd76 SP |
1751 | mapsz = xsize_t(st.st_size); |
1752 | log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0); | |
cb48cb58 | 1753 | logdata = log_mapped; |
d556fae2 SP |
1754 | close(logfd); |
1755 | ||
e5229042 | 1756 | lastrec = NULL; |
d556fae2 SP |
1757 | rec = logend = logdata + st.st_size; |
1758 | while (logdata < rec) { | |
e29cb53a | 1759 | reccnt++; |
d556fae2 SP |
1760 | if (logdata < rec && *(rec-1) == '\n') |
1761 | rec--; | |
e5229042 SP |
1762 | lastgt = NULL; |
1763 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 1764 | rec--; |
e5229042 SP |
1765 | if (*rec == '>') |
1766 | lastgt = rec; | |
1767 | } | |
1768 | if (!lastgt) | |
d556fae2 | 1769 | die("Log %s is corrupt.", logfile); |
e5229042 | 1770 | date = strtoul(lastgt + 1, &tz_c, 10); |
ab2a1a32 | 1771 | if (date <= at_time || cnt == 0) { |
76a44c5c | 1772 | tz = strtoul(tz_c, NULL, 10); |
16d7cc90 JH |
1773 | if (msg) |
1774 | *msg = ref_msg(rec, logend); | |
1775 | if (cutoff_time) | |
1776 | *cutoff_time = date; | |
1777 | if (cutoff_tz) | |
1778 | *cutoff_tz = tz; | |
1779 | if (cutoff_cnt) | |
76a44c5c | 1780 | *cutoff_cnt = reccnt - 1; |
e5229042 SP |
1781 | if (lastrec) { |
1782 | if (get_sha1_hex(lastrec, logged_sha1)) | |
1783 | die("Log %s is corrupt.", logfile); | |
1784 | if (get_sha1_hex(rec + 41, sha1)) | |
1785 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1786 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1787 | warning("Log %s has gap after %s.", |
73013afd | 1788 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 | 1789 | } |
e5f38ec3 JH |
1790 | } |
1791 | else if (date == at_time) { | |
e5229042 SP |
1792 | if (get_sha1_hex(rec + 41, sha1)) |
1793 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
1794 | } |
1795 | else { | |
e5229042 SP |
1796 | if (get_sha1_hex(rec + 41, logged_sha1)) |
1797 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1798 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1799 | warning("Log %s unexpectedly ended on %s.", |
73013afd | 1800 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 SP |
1801 | } |
1802 | } | |
dc49cd76 | 1803 | munmap(log_mapped, mapsz); |
d556fae2 SP |
1804 | return 0; |
1805 | } | |
e5229042 | 1806 | lastrec = rec; |
ab2a1a32 JH |
1807 | if (cnt > 0) |
1808 | cnt--; | |
d556fae2 SP |
1809 | } |
1810 | ||
e5229042 SP |
1811 | rec = logdata; |
1812 | while (rec < logend && *rec != '>' && *rec != '\n') | |
1813 | rec++; | |
1814 | if (rec == logend || *rec == '\n') | |
d556fae2 | 1815 | die("Log %s is corrupt.", logfile); |
e5229042 | 1816 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
1817 | tz = strtoul(tz_c, NULL, 10); |
1818 | if (get_sha1_hex(logdata, sha1)) | |
1819 | die("Log %s is corrupt.", logfile); | |
d1a4489a JK |
1820 | if (is_null_sha1(sha1)) { |
1821 | if (get_sha1_hex(logdata + 41, sha1)) | |
1822 | die("Log %s is corrupt.", logfile); | |
1823 | } | |
16d7cc90 JH |
1824 | if (msg) |
1825 | *msg = ref_msg(logdata, logend); | |
dc49cd76 | 1826 | munmap(log_mapped, mapsz); |
16d7cc90 JH |
1827 | |
1828 | if (cutoff_time) | |
1829 | *cutoff_time = date; | |
1830 | if (cutoff_tz) | |
1831 | *cutoff_tz = tz; | |
1832 | if (cutoff_cnt) | |
1833 | *cutoff_cnt = reccnt; | |
1834 | return 1; | |
d556fae2 | 1835 | } |
2ff81662 | 1836 | |
101d15e0 | 1837 | int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long ofs, void *cb_data) |
2ff81662 JH |
1838 | { |
1839 | const char *logfile; | |
1840 | FILE *logfp; | |
8ca78803 | 1841 | struct strbuf sb = STRBUF_INIT; |
2266bf27 | 1842 | int ret = 0; |
2ff81662 JH |
1843 | |
1844 | logfile = git_path("logs/%s", ref); | |
1845 | logfp = fopen(logfile, "r"); | |
1846 | if (!logfp) | |
883d60fa | 1847 | return -1; |
101d15e0 JH |
1848 | |
1849 | if (ofs) { | |
1850 | struct stat statbuf; | |
1851 | if (fstat(fileno(logfp), &statbuf) || | |
1852 | statbuf.st_size < ofs || | |
1853 | fseek(logfp, -ofs, SEEK_END) || | |
8ca78803 | 1854 | strbuf_getwholeline(&sb, logfp, '\n')) { |
9d33f7c2 | 1855 | fclose(logfp); |
8ca78803 | 1856 | strbuf_release(&sb); |
101d15e0 | 1857 | return -1; |
9d33f7c2 | 1858 | } |
101d15e0 JH |
1859 | } |
1860 | ||
8ca78803 | 1861 | while (!strbuf_getwholeline(&sb, logfp, '\n')) { |
2ff81662 | 1862 | unsigned char osha1[20], nsha1[20]; |
883d60fa JS |
1863 | char *email_end, *message; |
1864 | unsigned long timestamp; | |
8ca78803 | 1865 | int tz; |
2ff81662 JH |
1866 | |
1867 | /* old SP new SP name <email> SP time TAB msg LF */ | |
8ca78803 RS |
1868 | if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' || |
1869 | get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' || | |
1870 | get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' || | |
1871 | !(email_end = strchr(sb.buf + 82, '>')) || | |
883d60fa JS |
1872 | email_end[1] != ' ' || |
1873 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
1874 | !message || message[0] != ' ' || | |
1875 | (message[1] != '+' && message[1] != '-') || | |
1876 | !isdigit(message[2]) || !isdigit(message[3]) || | |
b4dd4856 | 1877 | !isdigit(message[4]) || !isdigit(message[5])) |
2ff81662 | 1878 | continue; /* corrupt? */ |
883d60fa JS |
1879 | email_end[1] = '\0'; |
1880 | tz = strtol(message + 1, NULL, 10); | |
b4dd4856 JS |
1881 | if (message[6] != '\t') |
1882 | message += 6; | |
1883 | else | |
1884 | message += 7; | |
8ca78803 RS |
1885 | ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message, |
1886 | cb_data); | |
883d60fa | 1887 | if (ret) |
2266bf27 | 1888 | break; |
2ff81662 JH |
1889 | } |
1890 | fclose(logfp); | |
8ca78803 | 1891 | strbuf_release(&sb); |
2266bf27 | 1892 | return ret; |
2ff81662 | 1893 | } |
e29cb53a | 1894 | |
101d15e0 JH |
1895 | int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data) |
1896 | { | |
1897 | return for_each_recent_reflog_ent(ref, fn, 0, cb_data); | |
1898 | } | |
1899 | ||
eb8381c8 NP |
1900 | static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data) |
1901 | { | |
1902 | DIR *dir = opendir(git_path("logs/%s", base)); | |
fcee5a14 | 1903 | int retval = 0; |
eb8381c8 NP |
1904 | |
1905 | if (dir) { | |
1906 | struct dirent *de; | |
1907 | int baselen = strlen(base); | |
1908 | char *log = xmalloc(baselen + 257); | |
1909 | ||
1910 | memcpy(log, base, baselen); | |
1911 | if (baselen && base[baselen-1] != '/') | |
1912 | log[baselen++] = '/'; | |
1913 | ||
1914 | while ((de = readdir(dir)) != NULL) { | |
1915 | struct stat st; | |
1916 | int namelen; | |
1917 | ||
1918 | if (de->d_name[0] == '.') | |
1919 | continue; | |
1920 | namelen = strlen(de->d_name); | |
1921 | if (namelen > 255) | |
1922 | continue; | |
1923 | if (has_extension(de->d_name, ".lock")) | |
1924 | continue; | |
1925 | memcpy(log + baselen, de->d_name, namelen+1); | |
1926 | if (stat(git_path("logs/%s", log), &st) < 0) | |
1927 | continue; | |
1928 | if (S_ISDIR(st.st_mode)) { | |
1929 | retval = do_for_each_reflog(log, fn, cb_data); | |
1930 | } else { | |
1931 | unsigned char sha1[20]; | |
c6893323 | 1932 | if (read_ref_full(log, sha1, 0, NULL)) |
eb8381c8 NP |
1933 | retval = error("bad ref for %s", log); |
1934 | else | |
1935 | retval = fn(log, sha1, 0, cb_data); | |
1936 | } | |
1937 | if (retval) | |
1938 | break; | |
1939 | } | |
1940 | free(log); | |
1941 | closedir(dir); | |
1942 | } | |
acb39f64 | 1943 | else if (*base) |
fcee5a14 | 1944 | return errno; |
eb8381c8 NP |
1945 | return retval; |
1946 | } | |
1947 | ||
1948 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
1949 | { | |
1950 | return do_for_each_reflog("", fn, cb_data); | |
1951 | } | |
3d9f037c CR |
1952 | |
1953 | int update_ref(const char *action, const char *refname, | |
1954 | const unsigned char *sha1, const unsigned char *oldval, | |
1955 | int flags, enum action_on_err onerr) | |
1956 | { | |
1957 | static struct ref_lock *lock; | |
1958 | lock = lock_any_ref_for_update(refname, oldval, flags); | |
1959 | if (!lock) { | |
1960 | const char *str = "Cannot lock the ref '%s'."; | |
1961 | switch (onerr) { | |
1962 | case MSG_ON_ERR: error(str, refname); break; | |
1963 | case DIE_ON_ERR: die(str, refname); break; | |
1964 | case QUIET_ON_ERR: break; | |
1965 | } | |
1966 | return 1; | |
1967 | } | |
1968 | if (write_ref_sha1(lock, sha1, action) < 0) { | |
1969 | const char *str = "Cannot update the ref '%s'."; | |
1970 | switch (onerr) { | |
1971 | case MSG_ON_ERR: error(str, refname); break; | |
1972 | case DIE_ON_ERR: die(str, refname); break; | |
1973 | case QUIET_ON_ERR: break; | |
1974 | } | |
1975 | return 1; | |
1976 | } | |
1977 | return 0; | |
1978 | } | |
cda69f48 | 1979 | |
2c5c66be | 1980 | int ref_exists(const char *refname) |
c17b2294 JH |
1981 | { |
1982 | unsigned char sha1[20]; | |
1983 | return !!resolve_ref(refname, sha1, 1, NULL); | |
1984 | } | |
1985 | ||
5483f799 | 1986 | struct ref *find_ref_by_name(const struct ref *list, const char *name) |
cda69f48 JK |
1987 | { |
1988 | for ( ; list; list = list->next) | |
1989 | if (!strcmp(list->name, name)) | |
5483f799 | 1990 | return (struct ref *)list; |
cda69f48 JK |
1991 | return NULL; |
1992 | } | |
7c2b3029 JK |
1993 | |
1994 | /* | |
1995 | * generate a format suitable for scanf from a ref_rev_parse_rules | |
1996 | * rule, that is replace the "%.*s" spec with a "%s" spec | |
1997 | */ | |
1998 | static void gen_scanf_fmt(char *scanf_fmt, const char *rule) | |
1999 | { | |
2000 | char *spec; | |
2001 | ||
2002 | spec = strstr(rule, "%.*s"); | |
2003 | if (!spec || strstr(spec + 4, "%.*s")) | |
2004 | die("invalid rule in ref_rev_parse_rules: %s", rule); | |
2005 | ||
2006 | /* copy all until spec */ | |
2007 | strncpy(scanf_fmt, rule, spec - rule); | |
2008 | scanf_fmt[spec - rule] = '\0'; | |
2009 | /* copy new spec */ | |
2010 | strcat(scanf_fmt, "%s"); | |
2011 | /* copy remaining rule */ | |
2012 | strcat(scanf_fmt, spec + 4); | |
2013 | ||
2014 | return; | |
2015 | } | |
2016 | ||
6e7b3309 | 2017 | char *shorten_unambiguous_ref(const char *ref, int strict) |
7c2b3029 JK |
2018 | { |
2019 | int i; | |
2020 | static char **scanf_fmts; | |
2021 | static int nr_rules; | |
2022 | char *short_name; | |
2023 | ||
2024 | /* pre generate scanf formats from ref_rev_parse_rules[] */ | |
2025 | if (!nr_rules) { | |
2026 | size_t total_len = 0; | |
2027 | ||
2028 | /* the rule list is NULL terminated, count them first */ | |
2029 | for (; ref_rev_parse_rules[nr_rules]; nr_rules++) | |
2030 | /* no +1 because strlen("%s") < strlen("%.*s") */ | |
2031 | total_len += strlen(ref_rev_parse_rules[nr_rules]); | |
2032 | ||
2033 | scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len); | |
2034 | ||
2035 | total_len = 0; | |
2036 | for (i = 0; i < nr_rules; i++) { | |
2037 | scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] | |
2038 | + total_len; | |
2039 | gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]); | |
2040 | total_len += strlen(ref_rev_parse_rules[i]); | |
2041 | } | |
2042 | } | |
2043 | ||
2044 | /* bail out if there are no rules */ | |
2045 | if (!nr_rules) | |
2046 | return xstrdup(ref); | |
2047 | ||
2048 | /* buffer for scanf result, at most ref must fit */ | |
2049 | short_name = xstrdup(ref); | |
2050 | ||
2051 | /* skip first rule, it will always match */ | |
2052 | for (i = nr_rules - 1; i > 0 ; --i) { | |
2053 | int j; | |
6e7b3309 | 2054 | int rules_to_fail = i; |
7c2b3029 JK |
2055 | int short_name_len; |
2056 | ||
2057 | if (1 != sscanf(ref, scanf_fmts[i], short_name)) | |
2058 | continue; | |
2059 | ||
2060 | short_name_len = strlen(short_name); | |
2061 | ||
6e7b3309 BW |
2062 | /* |
2063 | * in strict mode, all (except the matched one) rules | |
2064 | * must fail to resolve to a valid non-ambiguous ref | |
2065 | */ | |
2066 | if (strict) | |
2067 | rules_to_fail = nr_rules; | |
2068 | ||
7c2b3029 JK |
2069 | /* |
2070 | * check if the short name resolves to a valid ref, | |
2071 | * but use only rules prior to the matched one | |
2072 | */ | |
6e7b3309 | 2073 | for (j = 0; j < rules_to_fail; j++) { |
7c2b3029 | 2074 | const char *rule = ref_rev_parse_rules[j]; |
7c2b3029 JK |
2075 | char refname[PATH_MAX]; |
2076 | ||
6e7b3309 BW |
2077 | /* skip matched rule */ |
2078 | if (i == j) | |
2079 | continue; | |
2080 | ||
7c2b3029 JK |
2081 | /* |
2082 | * the short name is ambiguous, if it resolves | |
2083 | * (with this previous rule) to a valid ref | |
2084 | * read_ref() returns 0 on success | |
2085 | */ | |
2086 | mksnpath(refname, sizeof(refname), | |
2087 | rule, short_name_len, short_name); | |
c6893323 | 2088 | if (ref_exists(refname)) |
7c2b3029 JK |
2089 | break; |
2090 | } | |
2091 | ||
2092 | /* | |
2093 | * short name is non-ambiguous if all previous rules | |
2094 | * haven't resolved to a valid ref | |
2095 | */ | |
6e7b3309 | 2096 | if (j == rules_to_fail) |
7c2b3029 JK |
2097 | return short_name; |
2098 | } | |
2099 | ||
2100 | free(short_name); | |
2101 | return xstrdup(ref); | |
2102 | } |