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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 | ||
fbd09e41 MH |
23 | /* |
24 | * Parse one line from a packed-refs file. Write the SHA1 to sha1. | |
25 | * Return a pointer to the refname within the line (null-terminated), | |
26 | * or NULL if there was a problem. | |
27 | */ | |
f4204ab9 | 28 | static const char *parse_ref_line(char *line, unsigned char *sha1) |
e1e22e37 LT |
29 | { |
30 | /* | |
31 | * 42: the answer to everything. | |
32 | * | |
33 | * In this case, it happens to be the answer to | |
34 | * 40 (length of sha1 hex representation) | |
35 | * +1 (space in between hex and name) | |
36 | * +1 (newline at the end of the line) | |
37 | */ | |
38 | int len = strlen(line) - 42; | |
39 | ||
40 | if (len <= 0) | |
41 | return NULL; | |
42 | if (get_sha1_hex(line, sha1) < 0) | |
43 | return NULL; | |
44 | if (!isspace(line[40])) | |
45 | return NULL; | |
46 | line += 41; | |
f4204ab9 JH |
47 | if (isspace(*line)) |
48 | return NULL; | |
e1e22e37 LT |
49 | if (line[len] != '\n') |
50 | return NULL; | |
51 | line[len] = 0; | |
cf0adba7 | 52 | |
e1e22e37 LT |
53 | return line; |
54 | } | |
55 | ||
6af1038b | 56 | /* Add a ref_entry to the end of the ref_array (unsorted). */ |
dfefa935 | 57 | static void add_ref(const char *refname, const unsigned char *sha1, |
09116a1c | 58 | int flag, int check_name, struct ref_array *refs, |
e9c4c111 | 59 | struct ref_entry **new_entry) |
e1e22e37 LT |
60 | { |
61 | int len; | |
e9c4c111 | 62 | struct ref_entry *entry; |
e1e22e37 LT |
63 | |
64 | /* Allocate it and add it in.. */ | |
dfefa935 | 65 | len = strlen(refname) + 1; |
e9c4c111 | 66 | entry = xmalloc(sizeof(struct ref_entry) + len); |
e1e22e37 | 67 | hashcpy(entry->sha1, sha1); |
f4204ab9 | 68 | hashclr(entry->peeled); |
09116a1c | 69 | if (check_name && |
dfefa935 MH |
70 | check_refname_format(refname, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT)) |
71 | die("Reference has invalid format: '%s'", refname); | |
72 | memcpy(entry->name, refname, len); | |
8da19775 | 73 | entry->flag = flag; |
f4204ab9 JH |
74 | if (new_entry) |
75 | *new_entry = entry; | |
e9c4c111 JP |
76 | ALLOC_GROW(refs->refs, refs->nr + 1, refs->alloc); |
77 | refs->refs[refs->nr++] = entry; | |
c774aab9 JP |
78 | } |
79 | ||
e9c4c111 | 80 | static int ref_entry_cmp(const void *a, const void *b) |
c774aab9 | 81 | { |
e9c4c111 JP |
82 | struct ref_entry *one = *(struct ref_entry **)a; |
83 | struct ref_entry *two = *(struct ref_entry **)b; | |
84 | return strcmp(one->name, two->name); | |
85 | } | |
c774aab9 | 86 | |
202a56a9 MH |
87 | /* |
88 | * Emit a warning and return true iff ref1 and ref2 have the same name | |
89 | * and the same sha1. Die if they have the same name but different | |
90 | * sha1s. | |
91 | */ | |
92 | static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2) | |
93 | { | |
94 | if (!strcmp(ref1->name, ref2->name)) { | |
95 | /* Duplicate name; make sure that the SHA1s match: */ | |
96 | if (hashcmp(ref1->sha1, ref2->sha1)) | |
97 | die("Duplicated ref, and SHA1s don't match: %s", | |
98 | ref1->name); | |
99 | warning("Duplicated ref: %s", ref1->name); | |
100 | return 1; | |
101 | } else { | |
102 | return 0; | |
103 | } | |
104 | } | |
105 | ||
e9c4c111 JP |
106 | static void sort_ref_array(struct ref_array *array) |
107 | { | |
202a56a9 | 108 | int i, j; |
c774aab9 | 109 | |
e9c4c111 JP |
110 | /* Nothing to sort unless there are at least two entries */ |
111 | if (array->nr < 2) | |
112 | return; | |
c774aab9 | 113 | |
e9c4c111 | 114 | qsort(array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp); |
c774aab9 | 115 | |
e9c4c111 | 116 | /* Remove any duplicates from the ref_array */ |
202a56a9 MH |
117 | i = 0; |
118 | for (j = 1; j < array->nr; j++) { | |
119 | if (is_dup_ref(array->refs[i], array->refs[j])) { | |
120 | free(array->refs[j]); | |
e9c4c111 JP |
121 | continue; |
122 | } | |
202a56a9 | 123 | array->refs[++i] = array->refs[j]; |
e9c4c111 JP |
124 | } |
125 | array->nr = i + 1; | |
126 | } | |
c774aab9 | 127 | |
dfefa935 | 128 | static struct ref_entry *search_ref_array(struct ref_array *array, const char *refname) |
e9c4c111 JP |
129 | { |
130 | struct ref_entry *e, **r; | |
131 | int len; | |
c774aab9 | 132 | |
dfefa935 | 133 | if (refname == NULL) |
e9c4c111 | 134 | return NULL; |
c774aab9 | 135 | |
68729696 BC |
136 | if (!array->nr) |
137 | return NULL; | |
c774aab9 | 138 | |
dfefa935 | 139 | len = strlen(refname) + 1; |
e9c4c111 | 140 | e = xmalloc(sizeof(struct ref_entry) + len); |
dfefa935 | 141 | memcpy(e->name, refname, len); |
c774aab9 | 142 | |
e9c4c111 | 143 | r = bsearch(&e, array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp); |
c774aab9 | 144 | |
e9c4c111 | 145 | free(e); |
c774aab9 | 146 | |
e9c4c111 JP |
147 | if (r == NULL) |
148 | return NULL; | |
c774aab9 | 149 | |
e9c4c111 | 150 | return *r; |
e1e22e37 LT |
151 | } |
152 | ||
5e290ff7 JH |
153 | /* |
154 | * Future: need to be in "struct repository" | |
155 | * when doing a full libification. | |
156 | */ | |
79c7ca54 MH |
157 | static struct ref_cache { |
158 | struct ref_cache *next; | |
5e290ff7 JH |
159 | char did_loose; |
160 | char did_packed; | |
e9c4c111 JP |
161 | struct ref_array loose; |
162 | struct ref_array packed; | |
ce40979c MH |
163 | /* The submodule name, or "" for the main repo. */ |
164 | char name[FLEX_ARRAY]; | |
79c7ca54 | 165 | } *ref_cache; |
0e88c130 | 166 | |
e9c4c111 | 167 | static struct ref_entry *current_ref; |
5e290ff7 | 168 | |
e9c4c111 | 169 | static struct ref_array extra_refs; |
e142a3c6 | 170 | |
7c59511e | 171 | static void clear_ref_array(struct ref_array *array) |
5e290ff7 | 172 | { |
e9c4c111 JP |
173 | int i; |
174 | for (i = 0; i < array->nr; i++) | |
175 | free(array->refs[i]); | |
176 | free(array->refs); | |
177 | array->nr = array->alloc = 0; | |
178 | array->refs = NULL; | |
5e290ff7 JH |
179 | } |
180 | ||
760c4512 | 181 | static void clear_packed_ref_cache(struct ref_cache *refs) |
e1e22e37 | 182 | { |
1b7edaf9 | 183 | if (refs->did_packed) |
7c59511e | 184 | clear_ref_array(&refs->packed); |
760c4512 | 185 | refs->did_packed = 0; |
5e290ff7 | 186 | } |
e1e22e37 | 187 | |
760c4512 MH |
188 | static void clear_loose_ref_cache(struct ref_cache *refs) |
189 | { | |
190 | if (refs->did_loose) | |
7c59511e | 191 | clear_ref_array(&refs->loose); |
760c4512 MH |
192 | refs->did_loose = 0; |
193 | } | |
194 | ||
79c7ca54 | 195 | static struct ref_cache *create_ref_cache(const char *submodule) |
e5dbf605 | 196 | { |
ce40979c | 197 | int len; |
79c7ca54 | 198 | struct ref_cache *refs; |
ce40979c MH |
199 | if (!submodule) |
200 | submodule = ""; | |
201 | len = strlen(submodule) + 1; | |
79c7ca54 | 202 | refs = xcalloc(1, sizeof(struct ref_cache) + len); |
ce40979c | 203 | memcpy(refs->name, submodule, len); |
e5dbf605 MH |
204 | return refs; |
205 | } | |
206 | ||
4349a668 | 207 | /* |
79c7ca54 | 208 | * Return a pointer to a ref_cache for the specified submodule. For |
4349a668 MH |
209 | * the main repository, use submodule==NULL. The returned structure |
210 | * will be allocated and initialized but not necessarily populated; it | |
211 | * should not be freed. | |
212 | */ | |
79c7ca54 | 213 | static struct ref_cache *get_ref_cache(const char *submodule) |
4349a668 | 214 | { |
79c7ca54 | 215 | struct ref_cache *refs = ref_cache; |
0e88c130 MH |
216 | if (!submodule) |
217 | submodule = ""; | |
218 | while (refs) { | |
219 | if (!strcmp(submodule, refs->name)) | |
220 | return refs; | |
221 | refs = refs->next; | |
4349a668 | 222 | } |
0e88c130 | 223 | |
79c7ca54 MH |
224 | refs = create_ref_cache(submodule); |
225 | refs->next = ref_cache; | |
226 | ref_cache = refs; | |
0e88c130 | 227 | return refs; |
4349a668 MH |
228 | } |
229 | ||
8be8bde7 | 230 | void invalidate_ref_cache(const char *submodule) |
f130b116 | 231 | { |
c5f29abd MH |
232 | struct ref_cache *refs = get_ref_cache(submodule); |
233 | clear_packed_ref_cache(refs); | |
234 | clear_loose_ref_cache(refs); | |
5e290ff7 | 235 | } |
e1e22e37 | 236 | |
2c5c66be | 237 | static void read_packed_refs(FILE *f, struct ref_array *array) |
f4204ab9 | 238 | { |
e9c4c111 | 239 | struct ref_entry *last = NULL; |
f4204ab9 JH |
240 | char refline[PATH_MAX]; |
241 | int flag = REF_ISPACKED; | |
242 | ||
243 | while (fgets(refline, sizeof(refline), f)) { | |
244 | unsigned char sha1[20]; | |
dfefa935 | 245 | const char *refname; |
f4204ab9 JH |
246 | static const char header[] = "# pack-refs with:"; |
247 | ||
248 | if (!strncmp(refline, header, sizeof(header)-1)) { | |
249 | const char *traits = refline + sizeof(header) - 1; | |
250 | if (strstr(traits, " peeled ")) | |
251 | flag |= REF_KNOWS_PEELED; | |
252 | /* perhaps other traits later as well */ | |
253 | continue; | |
254 | } | |
255 | ||
dfefa935 MH |
256 | refname = parse_ref_line(refline, sha1); |
257 | if (refname) { | |
258 | add_ref(refname, sha1, flag, 1, array, &last); | |
f4204ab9 JH |
259 | continue; |
260 | } | |
261 | if (last && | |
262 | refline[0] == '^' && | |
263 | strlen(refline) == 42 && | |
264 | refline[41] == '\n' && | |
265 | !get_sha1_hex(refline + 1, sha1)) | |
266 | hashcpy(last->peeled, sha1); | |
267 | } | |
2c5c66be | 268 | sort_ref_array(array); |
f4204ab9 JH |
269 | } |
270 | ||
dfefa935 | 271 | void add_extra_ref(const char *refname, const unsigned char *sha1, int flag) |
e142a3c6 | 272 | { |
dfefa935 | 273 | add_ref(refname, sha1, flag, 0, &extra_refs, NULL); |
e142a3c6 DB |
274 | } |
275 | ||
276 | void clear_extra_refs(void) | |
277 | { | |
7c59511e | 278 | clear_ref_array(&extra_refs); |
e142a3c6 DB |
279 | } |
280 | ||
316b097a | 281 | static struct ref_array *get_packed_refs(struct ref_cache *refs) |
5e290ff7 | 282 | { |
4349a668 MH |
283 | if (!refs->did_packed) { |
284 | const char *packed_refs_file; | |
285 | FILE *f; | |
0bad611b | 286 | |
316b097a MH |
287 | if (*refs->name) |
288 | packed_refs_file = git_path_submodule(refs->name, "packed-refs"); | |
4349a668 MH |
289 | else |
290 | packed_refs_file = git_path("packed-refs"); | |
291 | f = fopen(packed_refs_file, "r"); | |
e1e22e37 | 292 | if (f) { |
2c5c66be | 293 | read_packed_refs(f, &refs->packed); |
e1e22e37 | 294 | fclose(f); |
e1e22e37 | 295 | } |
0bad611b | 296 | refs->did_packed = 1; |
e1e22e37 | 297 | } |
e9c4c111 | 298 | return &refs->packed; |
e1e22e37 LT |
299 | } |
300 | ||
e9c4c111 JP |
301 | static void get_ref_dir(const char *submodule, const char *base, |
302 | struct ref_array *array) | |
e1e22e37 | 303 | { |
0bad611b HV |
304 | DIR *dir; |
305 | const char *path; | |
306 | ||
316b097a | 307 | if (*submodule) |
0bad611b HV |
308 | path = git_path_submodule(submodule, "%s", base); |
309 | else | |
310 | path = git_path("%s", base); | |
311 | ||
312 | ||
313 | dir = opendir(path); | |
e1e22e37 LT |
314 | |
315 | if (dir) { | |
316 | struct dirent *de; | |
317 | int baselen = strlen(base); | |
dfefa935 | 318 | char *refname = xmalloc(baselen + 257); |
e1e22e37 | 319 | |
dfefa935 | 320 | memcpy(refname, base, baselen); |
e1e22e37 | 321 | if (baselen && base[baselen-1] != '/') |
dfefa935 | 322 | refname[baselen++] = '/'; |
e1e22e37 LT |
323 | |
324 | while ((de = readdir(dir)) != NULL) { | |
325 | unsigned char sha1[20]; | |
326 | struct stat st; | |
8da19775 | 327 | int flag; |
e1e22e37 | 328 | int namelen; |
0bad611b | 329 | const char *refdir; |
e1e22e37 LT |
330 | |
331 | if (de->d_name[0] == '.') | |
332 | continue; | |
333 | namelen = strlen(de->d_name); | |
334 | if (namelen > 255) | |
335 | continue; | |
336 | if (has_extension(de->d_name, ".lock")) | |
337 | continue; | |
dfefa935 | 338 | memcpy(refname + baselen, de->d_name, namelen+1); |
0bad611b | 339 | refdir = submodule |
dfefa935 MH |
340 | ? git_path_submodule(submodule, "%s", refname) |
341 | : git_path("%s", refname); | |
0bad611b | 342 | if (stat(refdir, &st) < 0) |
e1e22e37 LT |
343 | continue; |
344 | if (S_ISDIR(st.st_mode)) { | |
dfefa935 | 345 | get_ref_dir(submodule, refname, array); |
e1e22e37 LT |
346 | continue; |
347 | } | |
0bad611b | 348 | if (submodule) { |
f8948e2f | 349 | hashclr(sha1); |
0bad611b | 350 | flag = 0; |
dfefa935 | 351 | if (resolve_gitlink_ref(submodule, refname, sha1) < 0) { |
0bad611b | 352 | hashclr(sha1); |
98ac34b2 | 353 | flag |= REF_ISBROKEN; |
0bad611b | 354 | } |
dfefa935 | 355 | } else if (read_ref_full(refname, sha1, 1, &flag)) { |
09116a1c JH |
356 | hashclr(sha1); |
357 | flag |= REF_ISBROKEN; | |
358 | } | |
dfefa935 | 359 | add_ref(refname, sha1, flag, 1, array, NULL); |
e1e22e37 | 360 | } |
dfefa935 | 361 | free(refname); |
e1e22e37 LT |
362 | closedir(dir); |
363 | } | |
e1e22e37 LT |
364 | } |
365 | ||
f8948e2f | 366 | struct warn_if_dangling_data { |
3cf6134a | 367 | FILE *fp; |
f8948e2f JH |
368 | const char *refname; |
369 | const char *msg_fmt; | |
370 | }; | |
371 | ||
372 | static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1, | |
373 | int flags, void *cb_data) | |
374 | { | |
375 | struct warn_if_dangling_data *d = cb_data; | |
376 | const char *resolves_to; | |
377 | unsigned char junk[20]; | |
378 | ||
379 | if (!(flags & REF_ISSYMREF)) | |
380 | return 0; | |
381 | ||
382 | resolves_to = resolve_ref(refname, junk, 0, NULL); | |
383 | if (!resolves_to || strcmp(resolves_to, d->refname)) | |
384 | return 0; | |
385 | ||
3cf6134a | 386 | fprintf(d->fp, d->msg_fmt, refname); |
f8948e2f JH |
387 | return 0; |
388 | } | |
389 | ||
3cf6134a | 390 | void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname) |
f8948e2f | 391 | { |
66dbfd55 GV |
392 | struct warn_if_dangling_data data; |
393 | ||
394 | data.fp = fp; | |
395 | data.refname = refname; | |
396 | data.msg_fmt = msg_fmt; | |
f8948e2f JH |
397 | for_each_rawref(warn_if_dangling_symref, &data); |
398 | } | |
399 | ||
316b097a | 400 | static struct ref_array *get_loose_refs(struct ref_cache *refs) |
e1e22e37 | 401 | { |
4349a668 | 402 | if (!refs->did_loose) { |
316b097a | 403 | get_ref_dir(refs->name, "refs", &refs->loose); |
2c5c66be | 404 | sort_ref_array(&refs->loose); |
4349a668 | 405 | refs->did_loose = 1; |
e1e22e37 | 406 | } |
2c5c66be | 407 | return &refs->loose; |
e1e22e37 LT |
408 | } |
409 | ||
ca8db142 LT |
410 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
411 | #define MAXDEPTH 5 | |
0ebde32c LT |
412 | #define MAXREFLEN (1024) |
413 | ||
e5fa45c1 JH |
414 | /* |
415 | * Called by resolve_gitlink_ref_recursive() after it failed to read | |
416 | * from "name", which is "module/.git/<refname>". Find <refname> in | |
417 | * the packed-refs file for the submodule. | |
418 | */ | |
dfefa935 | 419 | static int resolve_gitlink_packed_ref(char *name, int pathlen, |
85be1fe3 | 420 | const char *refname, unsigned char *sha1) |
0ebde32c | 421 | { |
e9c4c111 | 422 | int retval = -1; |
2c5c66be | 423 | struct ref_entry *ref; |
e5fa45c1 | 424 | struct ref_array *array; |
0ebde32c | 425 | |
e5fa45c1 JH |
426 | /* being defensive: resolve_gitlink_ref() did this for us */ |
427 | if (pathlen < 6 || memcmp(name + pathlen - 6, "/.git/", 6)) | |
428 | die("Oops"); | |
429 | name[pathlen - 6] = '\0'; /* make it path to the submodule */ | |
316b097a | 430 | array = get_packed_refs(get_ref_cache(name)); |
2c5c66be | 431 | ref = search_ref_array(array, refname); |
e9c4c111 | 432 | if (ref != NULL) { |
85be1fe3 | 433 | memcpy(sha1, ref->sha1, 20); |
e9c4c111 | 434 | retval = 0; |
0ebde32c | 435 | } |
0ebde32c LT |
436 | return retval; |
437 | } | |
438 | ||
dfefa935 | 439 | static int resolve_gitlink_ref_recursive(char *name, int pathlen, |
85be1fe3 | 440 | const char *refname, unsigned char *sha1, |
dfefa935 | 441 | int recursion) |
0ebde32c LT |
442 | { |
443 | int fd, len = strlen(refname); | |
444 | char buffer[128], *p; | |
445 | ||
446 | if (recursion > MAXDEPTH || len > MAXREFLEN) | |
447 | return -1; | |
448 | memcpy(name + pathlen, refname, len+1); | |
449 | fd = open(name, O_RDONLY); | |
450 | if (fd < 0) | |
85be1fe3 | 451 | return resolve_gitlink_packed_ref(name, pathlen, refname, sha1); |
0ebde32c LT |
452 | |
453 | len = read(fd, buffer, sizeof(buffer)-1); | |
454 | close(fd); | |
455 | if (len < 0) | |
456 | return -1; | |
457 | while (len && isspace(buffer[len-1])) | |
458 | len--; | |
459 | buffer[len] = 0; | |
460 | ||
461 | /* Was it a detached head or an old-fashioned symlink? */ | |
85be1fe3 | 462 | if (!get_sha1_hex(buffer, sha1)) |
0ebde32c LT |
463 | return 0; |
464 | ||
465 | /* Symref? */ | |
466 | if (strncmp(buffer, "ref:", 4)) | |
467 | return -1; | |
468 | p = buffer + 4; | |
469 | while (isspace(*p)) | |
470 | p++; | |
471 | ||
85be1fe3 | 472 | return resolve_gitlink_ref_recursive(name, pathlen, p, sha1, recursion+1); |
0ebde32c LT |
473 | } |
474 | ||
85be1fe3 | 475 | int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1) |
0ebde32c LT |
476 | { |
477 | int len = strlen(path), retval; | |
478 | char *gitdir; | |
842abf06 | 479 | const char *tmp; |
0ebde32c LT |
480 | |
481 | while (len && path[len-1] == '/') | |
482 | len--; | |
483 | if (!len) | |
484 | return -1; | |
485 | gitdir = xmalloc(len + MAXREFLEN + 8); | |
486 | memcpy(gitdir, path, len); | |
842abf06 LH |
487 | memcpy(gitdir + len, "/.git", 6); |
488 | len += 5; | |
489 | ||
13d6ec91 | 490 | tmp = read_gitfile(gitdir); |
842abf06 LH |
491 | if (tmp) { |
492 | free(gitdir); | |
493 | len = strlen(tmp); | |
494 | gitdir = xmalloc(len + MAXREFLEN + 3); | |
495 | memcpy(gitdir, tmp, len); | |
496 | } | |
497 | gitdir[len] = '/'; | |
498 | gitdir[++len] = '\0'; | |
85be1fe3 | 499 | retval = resolve_gitlink_ref_recursive(gitdir, len, refname, sha1, 0); |
0ebde32c LT |
500 | free(gitdir); |
501 | return retval; | |
502 | } | |
ca8db142 | 503 | |
4886b89f | 504 | /* |
c224ca7f MH |
505 | * Try to read ref from the packed references. On success, set sha1 |
506 | * and return 0; otherwise, return -1. | |
4886b89f | 507 | */ |
dfefa935 | 508 | static int get_packed_ref(const char *refname, unsigned char *sha1) |
c224ca7f | 509 | { |
316b097a | 510 | struct ref_array *packed = get_packed_refs(get_ref_cache(NULL)); |
dfefa935 | 511 | struct ref_entry *entry = search_ref_array(packed, refname); |
2c5c66be JH |
512 | if (entry) { |
513 | hashcpy(sha1, entry->sha1); | |
514 | return 0; | |
c224ca7f MH |
515 | } |
516 | return -1; | |
517 | } | |
518 | ||
dfefa935 | 519 | const char *resolve_ref(const char *refname, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 520 | { |
0104ca09 HO |
521 | int depth = MAXDEPTH; |
522 | ssize_t len; | |
a876ed83 | 523 | char buffer[256]; |
dfefa935 | 524 | static char refname_buffer[256]; |
ca8db142 | 525 | |
8da19775 JH |
526 | if (flag) |
527 | *flag = 0; | |
528 | ||
dfefa935 | 529 | if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) |
8384d788 MH |
530 | return NULL; |
531 | ||
a876ed83 | 532 | for (;;) { |
55956350 | 533 | char path[PATH_MAX]; |
a876ed83 JH |
534 | struct stat st; |
535 | char *buf; | |
536 | int fd; | |
8a65ff76 | 537 | |
a876ed83 JH |
538 | if (--depth < 0) |
539 | return NULL; | |
ca8db142 | 540 | |
dfefa935 | 541 | git_snpath(path, sizeof(path), "%s", refname); |
c224ca7f | 542 | |
a876ed83 | 543 | if (lstat(path, &st) < 0) { |
c224ca7f MH |
544 | if (errno != ENOENT) |
545 | return NULL; | |
546 | /* | |
547 | * The loose reference file does not exist; | |
548 | * check for a packed reference. | |
549 | */ | |
dfefa935 | 550 | if (!get_packed_ref(refname, sha1)) { |
c224ca7f MH |
551 | if (flag) |
552 | *flag |= REF_ISPACKED; | |
dfefa935 | 553 | return refname; |
434cd0cd | 554 | } |
c224ca7f MH |
555 | /* The reference is not a packed reference, either. */ |
556 | if (reading) { | |
a876ed83 | 557 | return NULL; |
c224ca7f MH |
558 | } else { |
559 | hashclr(sha1); | |
dfefa935 | 560 | return refname; |
c224ca7f | 561 | } |
a876ed83 | 562 | } |
ca8db142 | 563 | |
a876ed83 JH |
564 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
565 | if (S_ISLNK(st.st_mode)) { | |
566 | len = readlink(path, buffer, sizeof(buffer)-1); | |
7bb2bf8e MH |
567 | if (len < 0) |
568 | return NULL; | |
b54cb795 | 569 | buffer[len] = 0; |
1f58a038 MH |
570 | if (!prefixcmp(buffer, "refs/") && |
571 | !check_refname_format(buffer, 0)) { | |
dfefa935 MH |
572 | strcpy(refname_buffer, buffer); |
573 | refname = refname_buffer; | |
8da19775 JH |
574 | if (flag) |
575 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
576 | continue; |
577 | } | |
ca8db142 | 578 | } |
a876ed83 | 579 | |
7a21632f DS |
580 | /* Is it a directory? */ |
581 | if (S_ISDIR(st.st_mode)) { | |
582 | errno = EISDIR; | |
583 | return NULL; | |
584 | } | |
585 | ||
a876ed83 JH |
586 | /* |
587 | * Anything else, just open it and try to use it as | |
588 | * a ref | |
589 | */ | |
590 | fd = open(path, O_RDONLY); | |
591 | if (fd < 0) | |
592 | return NULL; | |
93d26e4c | 593 | len = read_in_full(fd, buffer, sizeof(buffer)-1); |
a876ed83 | 594 | close(fd); |
28775050 MH |
595 | if (len < 0) |
596 | return NULL; | |
597 | while (len && isspace(buffer[len-1])) | |
598 | len--; | |
599 | buffer[len] = '\0'; | |
a876ed83 JH |
600 | |
601 | /* | |
602 | * Is it a symbolic ref? | |
603 | */ | |
28775050 | 604 | if (prefixcmp(buffer, "ref:")) |
a876ed83 | 605 | break; |
55956350 JH |
606 | if (flag) |
607 | *flag |= REF_ISSYMREF; | |
a876ed83 | 608 | buf = buffer + 4; |
28775050 MH |
609 | while (isspace(*buf)) |
610 | buf++; | |
313fb010 | 611 | if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) { |
55956350 JH |
612 | if (flag) |
613 | *flag |= REF_ISBROKEN; | |
313fb010 MH |
614 | return NULL; |
615 | } | |
dfefa935 | 616 | refname = strcpy(refname_buffer, buf); |
8a65ff76 | 617 | } |
f989fea0 MH |
618 | /* Please note that FETCH_HEAD has a second line containing other data. */ |
619 | if (get_sha1_hex(buffer, sha1) || (buffer[40] != '\0' && !isspace(buffer[40]))) { | |
55956350 JH |
620 | if (flag) |
621 | *flag |= REF_ISBROKEN; | |
a876ed83 | 622 | return NULL; |
629cd3ac | 623 | } |
dfefa935 | 624 | return refname; |
a876ed83 JH |
625 | } |
626 | ||
d08bae7e IL |
627 | /* The argument to filter_refs */ |
628 | struct ref_filter { | |
629 | const char *pattern; | |
630 | each_ref_fn *fn; | |
631 | void *cb_data; | |
632 | }; | |
633 | ||
dfefa935 | 634 | int read_ref_full(const char *refname, unsigned char *sha1, int reading, int *flags) |
a876ed83 | 635 | { |
dfefa935 | 636 | if (resolve_ref(refname, sha1, reading, flags)) |
a876ed83 JH |
637 | return 0; |
638 | return -1; | |
8a65ff76 LT |
639 | } |
640 | ||
dfefa935 | 641 | int read_ref(const char *refname, unsigned char *sha1) |
c6893323 | 642 | { |
dfefa935 | 643 | return read_ref_full(refname, sha1, 1, NULL); |
c6893323 NTND |
644 | } |
645 | ||
f8948e2f | 646 | #define DO_FOR_EACH_INCLUDE_BROKEN 01 |
ef06b918 | 647 | static int do_one_ref(const char *base, each_ref_fn fn, int trim, |
e9c4c111 | 648 | int flags, void *cb_data, struct ref_entry *entry) |
ef06b918 | 649 | { |
b3cfc406 | 650 | if (prefixcmp(entry->name, base)) |
ef06b918 | 651 | return 0; |
e01de1c9 | 652 | |
f8948e2f | 653 | if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) { |
98ac34b2 JH |
654 | if (entry->flag & REF_ISBROKEN) |
655 | return 0; /* ignore broken refs e.g. dangling symref */ | |
f8948e2f JH |
656 | if (!has_sha1_file(entry->sha1)) { |
657 | error("%s does not point to a valid object!", entry->name); | |
658 | return 0; | |
659 | } | |
ef06b918 | 660 | } |
0ae91be0 | 661 | current_ref = entry; |
ef06b918 JH |
662 | return fn(entry->name + trim, entry->sha1, entry->flag, cb_data); |
663 | } | |
664 | ||
85be1fe3 | 665 | static int filter_refs(const char *refname, const unsigned char *sha1, int flags, |
dfefa935 | 666 | void *data) |
d08bae7e IL |
667 | { |
668 | struct ref_filter *filter = (struct ref_filter *)data; | |
dfefa935 | 669 | if (fnmatch(filter->pattern, refname, 0)) |
d08bae7e | 670 | return 0; |
85be1fe3 | 671 | return filter->fn(refname, sha1, flags, filter->cb_data); |
d08bae7e IL |
672 | } |
673 | ||
dfefa935 | 674 | int peel_ref(const char *refname, unsigned char *sha1) |
cf0adba7 JH |
675 | { |
676 | int flag; | |
677 | unsigned char base[20]; | |
678 | struct object *o; | |
679 | ||
dfefa935 MH |
680 | if (current_ref && (current_ref->name == refname |
681 | || !strcmp(current_ref->name, refname))) { | |
0ae91be0 SP |
682 | if (current_ref->flag & REF_KNOWS_PEELED) { |
683 | hashcpy(sha1, current_ref->peeled); | |
684 | return 0; | |
685 | } | |
686 | hashcpy(base, current_ref->sha1); | |
687 | goto fallback; | |
688 | } | |
689 | ||
dfefa935 | 690 | if (read_ref_full(refname, base, 1, &flag)) |
cf0adba7 JH |
691 | return -1; |
692 | ||
693 | if ((flag & REF_ISPACKED)) { | |
316b097a | 694 | struct ref_array *array = get_packed_refs(get_ref_cache(NULL)); |
dfefa935 | 695 | struct ref_entry *r = search_ref_array(array, refname); |
cf0adba7 | 696 | |
e9c4c111 JP |
697 | if (r != NULL && r->flag & REF_KNOWS_PEELED) { |
698 | hashcpy(sha1, r->peeled); | |
699 | return 0; | |
cf0adba7 | 700 | } |
cf0adba7 JH |
701 | } |
702 | ||
0ae91be0 | 703 | fallback: |
cf0adba7 | 704 | o = parse_object(base); |
8c87dc77 | 705 | if (o && o->type == OBJ_TAG) { |
dfefa935 | 706 | o = deref_tag(o, refname, 0); |
cf0adba7 JH |
707 | if (o) { |
708 | hashcpy(sha1, o->sha1); | |
709 | return 0; | |
710 | } | |
711 | } | |
712 | return -1; | |
713 | } | |
714 | ||
0bad611b HV |
715 | static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn, |
716 | int trim, int flags, void *cb_data) | |
8a65ff76 | 717 | { |
e9c4c111 | 718 | int retval = 0, i, p = 0, l = 0; |
316b097a MH |
719 | struct ref_cache *refs = get_ref_cache(submodule); |
720 | struct ref_array *packed = get_packed_refs(refs); | |
721 | struct ref_array *loose = get_loose_refs(refs); | |
8a65ff76 | 722 | |
e9c4c111 | 723 | struct ref_array *extra = &extra_refs; |
e142a3c6 | 724 | |
e9c4c111 JP |
725 | for (i = 0; i < extra->nr; i++) |
726 | retval = do_one_ref(base, fn, trim, flags, cb_data, extra->refs[i]); | |
e142a3c6 | 727 | |
e9c4c111 JP |
728 | while (p < packed->nr && l < loose->nr) { |
729 | struct ref_entry *entry; | |
730 | int cmp = strcmp(packed->refs[p]->name, loose->refs[l]->name); | |
e1e22e37 | 731 | if (!cmp) { |
e9c4c111 | 732 | p++; |
e1e22e37 | 733 | continue; |
6cada6a9 | 734 | } |
e1e22e37 | 735 | if (cmp > 0) { |
e9c4c111 | 736 | entry = loose->refs[l++]; |
e1e22e37 | 737 | } else { |
e9c4c111 | 738 | entry = packed->refs[p++]; |
e1e22e37 | 739 | } |
f8948e2f | 740 | retval = do_one_ref(base, fn, trim, flags, cb_data, entry); |
e1e22e37 | 741 | if (retval) |
0ae91be0 | 742 | goto end_each; |
e1e22e37 | 743 | } |
8a65ff76 | 744 | |
e9c4c111 JP |
745 | if (l < loose->nr) { |
746 | p = l; | |
747 | packed = loose; | |
748 | } | |
749 | ||
750 | for (; p < packed->nr; p++) { | |
751 | retval = do_one_ref(base, fn, trim, flags, cb_data, packed->refs[p]); | |
ef06b918 | 752 | if (retval) |
0ae91be0 | 753 | goto end_each; |
8a65ff76 | 754 | } |
0ae91be0 SP |
755 | |
756 | end_each: | |
757 | current_ref = NULL; | |
758 | return retval; | |
8a65ff76 LT |
759 | } |
760 | ||
0bad611b HV |
761 | |
762 | static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data) | |
723c31fe LT |
763 | { |
764 | unsigned char sha1[20]; | |
8da19775 JH |
765 | int flag; |
766 | ||
0bad611b HV |
767 | if (submodule) { |
768 | if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0) | |
769 | return fn("HEAD", sha1, 0, cb_data); | |
770 | ||
771 | return 0; | |
772 | } | |
773 | ||
c6893323 | 774 | if (!read_ref_full("HEAD", sha1, 1, &flag)) |
8da19775 | 775 | return fn("HEAD", sha1, flag, cb_data); |
0bad611b | 776 | |
2f34ba32 | 777 | return 0; |
723c31fe LT |
778 | } |
779 | ||
0bad611b HV |
780 | int head_ref(each_ref_fn fn, void *cb_data) |
781 | { | |
782 | return do_head_ref(NULL, fn, cb_data); | |
783 | } | |
784 | ||
9ef6aeb0 HV |
785 | int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
786 | { | |
787 | return do_head_ref(submodule, fn, cb_data); | |
788 | } | |
789 | ||
cb5d709f | 790 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 791 | { |
b3cfc406 | 792 | return do_for_each_ref(NULL, "", fn, 0, 0, cb_data); |
a62be77f SE |
793 | } |
794 | ||
9ef6aeb0 HV |
795 | int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
796 | { | |
b3cfc406 | 797 | return do_for_each_ref(submodule, "", fn, 0, 0, cb_data); |
a62be77f SE |
798 | } |
799 | ||
2a8177b6 CC |
800 | int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data) |
801 | { | |
0bad611b | 802 | return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data); |
2a8177b6 CC |
803 | } |
804 | ||
9ef6aeb0 HV |
805 | int for_each_ref_in_submodule(const char *submodule, const char *prefix, |
806 | each_ref_fn fn, void *cb_data) | |
807 | { | |
808 | return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data); | |
2a8177b6 CC |
809 | } |
810 | ||
cb5d709f | 811 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 812 | { |
2a8177b6 | 813 | return for_each_ref_in("refs/tags/", fn, cb_data); |
a62be77f SE |
814 | } |
815 | ||
9ef6aeb0 HV |
816 | int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
817 | { | |
818 | return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data); | |
819 | } | |
820 | ||
cb5d709f | 821 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 822 | { |
2a8177b6 | 823 | return for_each_ref_in("refs/heads/", fn, cb_data); |
a62be77f SE |
824 | } |
825 | ||
9ef6aeb0 HV |
826 | int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
827 | { | |
828 | return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data); | |
829 | } | |
830 | ||
cb5d709f | 831 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 832 | { |
2a8177b6 | 833 | return for_each_ref_in("refs/remotes/", fn, cb_data); |
f8948e2f JH |
834 | } |
835 | ||
9ef6aeb0 HV |
836 | int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data) |
837 | { | |
838 | return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data); | |
839 | } | |
840 | ||
29268700 CC |
841 | int for_each_replace_ref(each_ref_fn fn, void *cb_data) |
842 | { | |
0bad611b | 843 | return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data); |
29268700 CC |
844 | } |
845 | ||
a1bea2c1 JT |
846 | int head_ref_namespaced(each_ref_fn fn, void *cb_data) |
847 | { | |
848 | struct strbuf buf = STRBUF_INIT; | |
849 | int ret = 0; | |
850 | unsigned char sha1[20]; | |
851 | int flag; | |
852 | ||
853 | strbuf_addf(&buf, "%sHEAD", get_git_namespace()); | |
c6893323 | 854 | if (!read_ref_full(buf.buf, sha1, 1, &flag)) |
a1bea2c1 JT |
855 | ret = fn(buf.buf, sha1, flag, cb_data); |
856 | strbuf_release(&buf); | |
857 | ||
858 | return ret; | |
859 | } | |
860 | ||
861 | int for_each_namespaced_ref(each_ref_fn fn, void *cb_data) | |
862 | { | |
863 | struct strbuf buf = STRBUF_INIT; | |
864 | int ret; | |
865 | strbuf_addf(&buf, "%srefs/", get_git_namespace()); | |
866 | ret = do_for_each_ref(NULL, buf.buf, fn, 0, 0, cb_data); | |
867 | strbuf_release(&buf); | |
868 | return ret; | |
869 | } | |
870 | ||
b09fe971 IL |
871 | int for_each_glob_ref_in(each_ref_fn fn, const char *pattern, |
872 | const char *prefix, void *cb_data) | |
d08bae7e IL |
873 | { |
874 | struct strbuf real_pattern = STRBUF_INIT; | |
875 | struct ref_filter filter; | |
d08bae7e IL |
876 | int ret; |
877 | ||
b09fe971 | 878 | if (!prefix && prefixcmp(pattern, "refs/")) |
d08bae7e | 879 | strbuf_addstr(&real_pattern, "refs/"); |
b09fe971 IL |
880 | else if (prefix) |
881 | strbuf_addstr(&real_pattern, prefix); | |
d08bae7e IL |
882 | strbuf_addstr(&real_pattern, pattern); |
883 | ||
894a9d33 | 884 | if (!has_glob_specials(pattern)) { |
9517e6b8 | 885 | /* Append implied '/' '*' if not present. */ |
d08bae7e IL |
886 | if (real_pattern.buf[real_pattern.len - 1] != '/') |
887 | strbuf_addch(&real_pattern, '/'); | |
888 | /* No need to check for '*', there is none. */ | |
889 | strbuf_addch(&real_pattern, '*'); | |
890 | } | |
891 | ||
892 | filter.pattern = real_pattern.buf; | |
893 | filter.fn = fn; | |
894 | filter.cb_data = cb_data; | |
895 | ret = for_each_ref(filter_refs, &filter); | |
896 | ||
897 | strbuf_release(&real_pattern); | |
898 | return ret; | |
899 | } | |
900 | ||
b09fe971 IL |
901 | int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data) |
902 | { | |
903 | return for_each_glob_ref_in(fn, pattern, NULL, cb_data); | |
904 | } | |
905 | ||
f8948e2f JH |
906 | int for_each_rawref(each_ref_fn fn, void *cb_data) |
907 | { | |
b3cfc406 | 908 | return do_for_each_ref(NULL, "", fn, 0, |
f8948e2f | 909 | DO_FOR_EACH_INCLUDE_BROKEN, cb_data); |
8a65ff76 LT |
910 | } |
911 | ||
03feddd6 JH |
912 | /* |
913 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
914 | * We do not like it if: | |
915 | * | |
916 | * - any path component of it begins with ".", or | |
917 | * - it has double dots "..", or | |
918 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
919 | * - it ends with a "/". | |
3e262b95 | 920 | * - it ends with ".lock" |
a4c2e699 | 921 | * - it contains a "\" (backslash) |
03feddd6 JH |
922 | */ |
923 | ||
9224b73b | 924 | /* Return true iff ch is not allowed in reference names. */ |
03feddd6 JH |
925 | static inline int bad_ref_char(int ch) |
926 | { | |
f3738c1c | 927 | if (((unsigned) ch) <= ' ' || ch == 0x7f || |
a4c2e699 | 928 | ch == '~' || ch == '^' || ch == ':' || ch == '\\') |
8558fd9e DB |
929 | return 1; |
930 | /* 2.13 Pattern Matching Notation */ | |
9224b73b | 931 | if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */ |
8558fd9e | 932 | return 1; |
8558fd9e | 933 | return 0; |
03feddd6 JH |
934 | } |
935 | ||
49295d4e | 936 | /* |
dfefa935 | 937 | * Try to read one refname component from the front of refname. Return |
49295d4e MH |
938 | * the length of the component found, or -1 if the component is not |
939 | * legal. | |
940 | */ | |
dfefa935 | 941 | static int check_refname_component(const char *refname, int flags) |
95fc7512 | 942 | { |
49295d4e MH |
943 | const char *cp; |
944 | char last = '\0'; | |
03feddd6 | 945 | |
dfefa935 | 946 | for (cp = refname; ; cp++) { |
49295d4e MH |
947 | char ch = *cp; |
948 | if (ch == '\0' || ch == '/') | |
949 | break; | |
950 | if (bad_ref_char(ch)) | |
951 | return -1; /* Illegal character in refname. */ | |
952 | if (last == '.' && ch == '.') | |
953 | return -1; /* Refname contains "..". */ | |
954 | if (last == '@' && ch == '{') | |
955 | return -1; /* Refname contains "@{". */ | |
cbdffe40 | 956 | last = ch; |
49295d4e | 957 | } |
dfefa935 | 958 | if (cp == refname) |
49295d4e | 959 | return -1; /* Component has zero length. */ |
dfefa935 | 960 | if (refname[0] == '.') { |
dce4bab6 MH |
961 | if (!(flags & REFNAME_DOT_COMPONENT)) |
962 | return -1; /* Component starts with '.'. */ | |
963 | /* | |
964 | * Even if leading dots are allowed, don't allow "." | |
965 | * as a component (".." is prevented by a rule above). | |
966 | */ | |
dfefa935 | 967 | if (refname[1] == '\0') |
dce4bab6 MH |
968 | return -1; /* Component equals ".". */ |
969 | } | |
dfefa935 | 970 | if (cp - refname >= 5 && !memcmp(cp - 5, ".lock", 5)) |
7e9d2fe9 | 971 | return -1; /* Refname ends with ".lock". */ |
dfefa935 | 972 | return cp - refname; |
49295d4e MH |
973 | } |
974 | ||
dfefa935 | 975 | int check_refname_format(const char *refname, int flags) |
95fc7512 | 976 | { |
49295d4e | 977 | int component_len, component_count = 0; |
03feddd6 | 978 | |
03feddd6 | 979 | while (1) { |
49295d4e | 980 | /* We are at the start of a path component. */ |
dfefa935 | 981 | component_len = check_refname_component(refname, flags); |
49295d4e MH |
982 | if (component_len < 0) { |
983 | if ((flags & REFNAME_REFSPEC_PATTERN) && | |
dfefa935 MH |
984 | refname[0] == '*' && |
985 | (refname[1] == '\0' || refname[1] == '/')) { | |
8d9c5010 MH |
986 | /* Accept one wildcard as a full refname component. */ |
987 | flags &= ~REFNAME_REFSPEC_PATTERN; | |
49295d4e MH |
988 | component_len = 1; |
989 | } else { | |
8d9c5010 | 990 | return -1; |
49295d4e | 991 | } |
03feddd6 | 992 | } |
49295d4e | 993 | component_count++; |
dfefa935 | 994 | if (refname[component_len] == '\0') |
49295d4e MH |
995 | break; |
996 | /* Skip to next component. */ | |
dfefa935 | 997 | refname += component_len + 1; |
03feddd6 | 998 | } |
49295d4e | 999 | |
dfefa935 | 1000 | if (refname[component_len - 1] == '.') |
49295d4e | 1001 | return -1; /* Refname ends with '.'. */ |
49295d4e MH |
1002 | if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2) |
1003 | return -1; /* Refname has only one component. */ | |
1004 | return 0; | |
95fc7512 DB |
1005 | } |
1006 | ||
4577e483 | 1007 | const char *prettify_refname(const char *name) |
a9c37a72 | 1008 | { |
a9c37a72 DB |
1009 | return name + ( |
1010 | !prefixcmp(name, "refs/heads/") ? 11 : | |
1011 | !prefixcmp(name, "refs/tags/") ? 10 : | |
1012 | !prefixcmp(name, "refs/remotes/") ? 13 : | |
1013 | 0); | |
1014 | } | |
1015 | ||
79803322 SP |
1016 | const char *ref_rev_parse_rules[] = { |
1017 | "%.*s", | |
1018 | "refs/%.*s", | |
1019 | "refs/tags/%.*s", | |
1020 | "refs/heads/%.*s", | |
1021 | "refs/remotes/%.*s", | |
1022 | "refs/remotes/%.*s/HEAD", | |
1023 | NULL | |
1024 | }; | |
1025 | ||
1026 | int refname_match(const char *abbrev_name, const char *full_name, const char **rules) | |
1027 | { | |
1028 | const char **p; | |
1029 | const int abbrev_name_len = strlen(abbrev_name); | |
1030 | ||
1031 | for (p = rules; *p; p++) { | |
1032 | if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) { | |
1033 | return 1; | |
1034 | } | |
1035 | } | |
1036 | ||
1037 | return 0; | |
1038 | } | |
1039 | ||
e5f38ec3 | 1040 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
1041 | const unsigned char *old_sha1, int mustexist) |
1042 | { | |
c6893323 | 1043 | if (read_ref_full(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 1044 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
1045 | unlock_ref(lock); |
1046 | return NULL; | |
1047 | } | |
a89fccd2 | 1048 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 1049 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
1050 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
1051 | unlock_ref(lock); | |
1052 | return NULL; | |
1053 | } | |
1054 | return lock; | |
1055 | } | |
1056 | ||
7155b727 | 1057 | static int remove_empty_directories(const char *file) |
bc7127ef JH |
1058 | { |
1059 | /* we want to create a file but there is a directory there; | |
1060 | * if that is an empty directory (or a directory that contains | |
1061 | * only empty directories), remove them. | |
1062 | */ | |
7155b727 JS |
1063 | struct strbuf path; |
1064 | int result; | |
bc7127ef | 1065 | |
7155b727 JS |
1066 | strbuf_init(&path, 20); |
1067 | strbuf_addstr(&path, file); | |
1068 | ||
a0f4afbe | 1069 | result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY); |
7155b727 JS |
1070 | |
1071 | strbuf_release(&path); | |
1072 | ||
1073 | return result; | |
bc7127ef JH |
1074 | } |
1075 | ||
19b68b1e MH |
1076 | /* |
1077 | * Return true iff a reference named refname could be created without | |
1078 | * conflicting with the name of an existing reference. If oldrefname | |
1079 | * is non-NULL, ignore potential conflicts with oldrefname (e.g., | |
1080 | * because oldrefname is scheduled for deletion in the same | |
1081 | * operation). | |
1082 | */ | |
dfefa935 | 1083 | static int is_refname_available(const char *refname, const char *oldrefname, |
19b68b1e | 1084 | struct ref_array *array) |
c976d415 | 1085 | { |
dfefa935 | 1086 | int i, namlen = strlen(refname); /* e.g. 'foo/bar' */ |
e9c4c111 JP |
1087 | for (i = 0; i < array->nr; i++ ) { |
1088 | struct ref_entry *entry = array->refs[i]; | |
1089 | /* entry->name could be 'foo' or 'foo/bar/baz' */ | |
dfefa935 | 1090 | if (!oldrefname || strcmp(oldrefname, entry->name)) { |
e9c4c111 | 1091 | int len = strlen(entry->name); |
c976d415 | 1092 | int cmplen = (namlen < len) ? namlen : len; |
dfefa935 MH |
1093 | const char *lead = (namlen < len) ? entry->name : refname; |
1094 | if (!strncmp(refname, entry->name, cmplen) && | |
c976d415 | 1095 | lead[cmplen] == '/') { |
19b68b1e MH |
1096 | error("'%s' exists; cannot create '%s'", |
1097 | entry->name, refname); | |
c976d415 LH |
1098 | return 0; |
1099 | } | |
1100 | } | |
c976d415 LH |
1101 | } |
1102 | return 1; | |
1103 | } | |
1104 | ||
ff74f7f1 JH |
1105 | /* |
1106 | * *string and *len will only be substituted, and *string returned (for | |
1107 | * later free()ing) if the string passed in is a magic short-hand form | |
1108 | * to name a branch. | |
1109 | */ | |
1110 | static char *substitute_branch_name(const char **string, int *len) | |
1111 | { | |
1112 | struct strbuf buf = STRBUF_INIT; | |
1113 | int ret = interpret_branch_name(*string, &buf); | |
1114 | ||
1115 | if (ret == *len) { | |
1116 | size_t size; | |
1117 | *string = strbuf_detach(&buf, &size); | |
1118 | *len = size; | |
1119 | return (char *)*string; | |
1120 | } | |
1121 | ||
1122 | return NULL; | |
1123 | } | |
1124 | ||
1125 | int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref) | |
1126 | { | |
1127 | char *last_branch = substitute_branch_name(&str, &len); | |
1128 | const char **p, *r; | |
1129 | int refs_found = 0; | |
1130 | ||
1131 | *ref = NULL; | |
1132 | for (p = ref_rev_parse_rules; *p; p++) { | |
1133 | char fullref[PATH_MAX]; | |
1134 | unsigned char sha1_from_ref[20]; | |
1135 | unsigned char *this_result; | |
1136 | int flag; | |
1137 | ||
1138 | this_result = refs_found ? sha1_from_ref : sha1; | |
1139 | mksnpath(fullref, sizeof(fullref), *p, len, str); | |
1140 | r = resolve_ref(fullref, this_result, 1, &flag); | |
1141 | if (r) { | |
1142 | if (!refs_found++) | |
1143 | *ref = xstrdup(r); | |
1144 | if (!warn_ambiguous_refs) | |
1145 | break; | |
55956350 | 1146 | } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) { |
ff74f7f1 | 1147 | warning("ignoring dangling symref %s.", fullref); |
55956350 JH |
1148 | } else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) { |
1149 | warning("ignoring broken ref %s.", fullref); | |
1150 | } | |
ff74f7f1 JH |
1151 | } |
1152 | free(last_branch); | |
1153 | return refs_found; | |
1154 | } | |
1155 | ||
1156 | int dwim_log(const char *str, int len, unsigned char *sha1, char **log) | |
1157 | { | |
1158 | char *last_branch = substitute_branch_name(&str, &len); | |
1159 | const char **p; | |
1160 | int logs_found = 0; | |
1161 | ||
1162 | *log = NULL; | |
1163 | for (p = ref_rev_parse_rules; *p; p++) { | |
1164 | struct stat st; | |
1165 | unsigned char hash[20]; | |
1166 | char path[PATH_MAX]; | |
1167 | const char *ref, *it; | |
1168 | ||
1169 | mksnpath(path, sizeof(path), *p, len, str); | |
1170 | ref = resolve_ref(path, hash, 1, NULL); | |
1171 | if (!ref) | |
1172 | continue; | |
1173 | if (!stat(git_path("logs/%s", path), &st) && | |
1174 | S_ISREG(st.st_mode)) | |
1175 | it = path; | |
1176 | else if (strcmp(ref, path) && | |
1177 | !stat(git_path("logs/%s", ref), &st) && | |
1178 | S_ISREG(st.st_mode)) | |
1179 | it = ref; | |
1180 | else | |
1181 | continue; | |
1182 | if (!logs_found++) { | |
1183 | *log = xstrdup(it); | |
1184 | hashcpy(sha1, hash); | |
1185 | } | |
1186 | if (!warn_ambiguous_refs) | |
1187 | break; | |
1188 | } | |
1189 | free(last_branch); | |
1190 | return logs_found; | |
1191 | } | |
1192 | ||
dfefa935 MH |
1193 | static struct ref_lock *lock_ref_sha1_basic(const char *refname, |
1194 | const unsigned char *old_sha1, | |
1195 | int flags, int *type_p) | |
4bd18c43 | 1196 | { |
434cd0cd | 1197 | char *ref_file; |
dfefa935 | 1198 | const char *orig_refname = refname; |
4bd18c43 | 1199 | struct ref_lock *lock; |
5cc3cef9 | 1200 | int last_errno = 0; |
acd3b9ec | 1201 | int type, lflags; |
4431fcc4 | 1202 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
5bdd8d4a | 1203 | int missing = 0; |
4bd18c43 SP |
1204 | |
1205 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
1206 | lock->lock_fd = -1; | |
1207 | ||
dfefa935 MH |
1208 | refname = resolve_ref(refname, lock->old_sha1, mustexist, &type); |
1209 | if (!refname && errno == EISDIR) { | |
bc7127ef JH |
1210 | /* we are trying to lock foo but we used to |
1211 | * have foo/bar which now does not exist; | |
1212 | * it is normal for the empty directory 'foo' | |
1213 | * to remain. | |
1214 | */ | |
dfefa935 | 1215 | ref_file = git_path("%s", orig_refname); |
5cc3cef9 JH |
1216 | if (remove_empty_directories(ref_file)) { |
1217 | last_errno = errno; | |
dfefa935 | 1218 | error("there are still refs under '%s'", orig_refname); |
5cc3cef9 JH |
1219 | goto error_return; |
1220 | } | |
dfefa935 | 1221 | refname = resolve_ref(orig_refname, lock->old_sha1, mustexist, &type); |
bc7127ef | 1222 | } |
68db31cc SV |
1223 | if (type_p) |
1224 | *type_p = type; | |
dfefa935 | 1225 | if (!refname) { |
5cc3cef9 | 1226 | last_errno = errno; |
818f477c | 1227 | error("unable to resolve reference %s: %s", |
dfefa935 | 1228 | orig_refname, strerror(errno)); |
5cc3cef9 | 1229 | goto error_return; |
4bd18c43 | 1230 | } |
5bdd8d4a | 1231 | missing = is_null_sha1(lock->old_sha1); |
c976d415 LH |
1232 | /* When the ref did not exist and we are creating it, |
1233 | * make sure there is no existing ref that is packed | |
1234 | * whose name begins with our refname, nor a ref whose | |
1235 | * name is a proper prefix of our refname. | |
1236 | */ | |
5bdd8d4a | 1237 | if (missing && |
316b097a | 1238 | !is_refname_available(refname, NULL, get_packed_refs(get_ref_cache(NULL)))) { |
f475e08e | 1239 | last_errno = ENOTDIR; |
c976d415 | 1240 | goto error_return; |
f475e08e | 1241 | } |
22a3844e | 1242 | |
c33d5174 | 1243 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 1244 | |
acd3b9ec JH |
1245 | lflags = LOCK_DIE_ON_ERROR; |
1246 | if (flags & REF_NODEREF) { | |
dfefa935 | 1247 | refname = orig_refname; |
acd3b9ec JH |
1248 | lflags |= LOCK_NODEREF; |
1249 | } | |
dfefa935 MH |
1250 | lock->ref_name = xstrdup(refname); |
1251 | lock->orig_ref_name = xstrdup(orig_refname); | |
1252 | ref_file = git_path("%s", refname); | |
5bdd8d4a | 1253 | if (missing) |
68db31cc SV |
1254 | lock->force_write = 1; |
1255 | if ((flags & REF_NODEREF) && (type & REF_ISSYMREF)) | |
1256 | lock->force_write = 1; | |
4bd18c43 | 1257 | |
5cc3cef9 JH |
1258 | if (safe_create_leading_directories(ref_file)) { |
1259 | last_errno = errno; | |
1260 | error("unable to create directory for %s", ref_file); | |
1261 | goto error_return; | |
1262 | } | |
4bd18c43 | 1263 | |
acd3b9ec | 1264 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags); |
4bd18c43 | 1265 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; |
5cc3cef9 JH |
1266 | |
1267 | error_return: | |
1268 | unlock_ref(lock); | |
1269 | errno = last_errno; | |
1270 | return NULL; | |
4bd18c43 SP |
1271 | } |
1272 | ||
dfefa935 | 1273 | struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha1) |
95fc7512 | 1274 | { |
53cce84c | 1275 | char refpath[PATH_MAX]; |
dfefa935 | 1276 | if (check_refname_format(refname, 0)) |
4bd18c43 | 1277 | return NULL; |
dfefa935 | 1278 | strcpy(refpath, mkpath("refs/%s", refname)); |
68db31cc | 1279 | return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL); |
4bd18c43 SP |
1280 | } |
1281 | ||
dfefa935 MH |
1282 | struct ref_lock *lock_any_ref_for_update(const char *refname, |
1283 | const unsigned char *old_sha1, int flags) | |
4bd18c43 | 1284 | { |
dfefa935 | 1285 | if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) |
257f3020 | 1286 | return NULL; |
dfefa935 | 1287 | return lock_ref_sha1_basic(refname, old_sha1, flags, NULL); |
c0277d15 JH |
1288 | } |
1289 | ||
26a063a1 JH |
1290 | static struct lock_file packlock; |
1291 | ||
c0277d15 JH |
1292 | static int repack_without_ref(const char *refname) |
1293 | { | |
e9c4c111 JP |
1294 | struct ref_array *packed; |
1295 | struct ref_entry *ref; | |
1296 | int fd, i; | |
c0277d15 | 1297 | |
316b097a | 1298 | packed = get_packed_refs(get_ref_cache(NULL)); |
e9c4c111 JP |
1299 | ref = search_ref_array(packed, refname); |
1300 | if (ref == NULL) | |
c0277d15 | 1301 | return 0; |
c0277d15 | 1302 | fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0); |
1b018fd9 MV |
1303 | if (fd < 0) { |
1304 | unable_to_lock_error(git_path("packed-refs"), errno); | |
c0277d15 | 1305 | return error("cannot delete '%s' from packed refs", refname); |
1b018fd9 | 1306 | } |
c0277d15 | 1307 | |
e9c4c111 | 1308 | for (i = 0; i < packed->nr; i++) { |
c0277d15 JH |
1309 | char line[PATH_MAX + 100]; |
1310 | int len; | |
1311 | ||
e9c4c111 JP |
1312 | ref = packed->refs[i]; |
1313 | ||
1314 | if (!strcmp(refname, ref->name)) | |
c0277d15 JH |
1315 | continue; |
1316 | len = snprintf(line, sizeof(line), "%s %s\n", | |
e9c4c111 | 1317 | sha1_to_hex(ref->sha1), ref->name); |
c0277d15 JH |
1318 | /* this should not happen but just being defensive */ |
1319 | if (len > sizeof(line)) | |
e9c4c111 | 1320 | die("too long a refname '%s'", ref->name); |
c0277d15 JH |
1321 | write_or_die(fd, line, len); |
1322 | } | |
1323 | return commit_lock_file(&packlock); | |
1324 | } | |
1325 | ||
eca35a25 | 1326 | int delete_ref(const char *refname, const unsigned char *sha1, int delopt) |
c0277d15 JH |
1327 | { |
1328 | struct ref_lock *lock; | |
eca35a25 | 1329 | int err, i = 0, ret = 0, flag = 0; |
c0277d15 | 1330 | |
68db31cc | 1331 | lock = lock_ref_sha1_basic(refname, sha1, 0, &flag); |
c0277d15 JH |
1332 | if (!lock) |
1333 | return 1; | |
045a476f | 1334 | if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) { |
c0277d15 | 1335 | /* loose */ |
eca35a25 MV |
1336 | const char *path; |
1337 | ||
1338 | if (!(delopt & REF_NODEREF)) { | |
1339 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
1340 | lock->lk->filename[i] = 0; | |
1341 | path = lock->lk->filename; | |
1342 | } else { | |
9db56f71 | 1343 | path = git_path("%s", refname); |
eca35a25 | 1344 | } |
691f1a28 AR |
1345 | err = unlink_or_warn(path); |
1346 | if (err && errno != ENOENT) | |
c0277d15 | 1347 | ret = 1; |
691f1a28 | 1348 | |
eca35a25 MV |
1349 | if (!(delopt & REF_NODEREF)) |
1350 | lock->lk->filename[i] = '.'; | |
c0277d15 JH |
1351 | } |
1352 | /* removing the loose one could have resurrected an earlier | |
1353 | * packed one. Also, if it was not loose we need to repack | |
1354 | * without it. | |
1355 | */ | |
1356 | ret |= repack_without_ref(refname); | |
1357 | ||
691f1a28 | 1358 | unlink_or_warn(git_path("logs/%s", lock->ref_name)); |
3870a0d1 | 1359 | invalidate_ref_cache(NULL); |
c0277d15 JH |
1360 | unlock_ref(lock); |
1361 | return ret; | |
4bd18c43 SP |
1362 | } |
1363 | ||
765c2258 PH |
1364 | /* |
1365 | * People using contrib's git-new-workdir have .git/logs/refs -> | |
1366 | * /some/other/path/.git/logs/refs, and that may live on another device. | |
1367 | * | |
1368 | * IOW, to avoid cross device rename errors, the temporary renamed log must | |
1369 | * live into logs/refs. | |
1370 | */ | |
1371 | #define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log" | |
1372 | ||
dfefa935 | 1373 | int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg) |
c976d415 | 1374 | { |
c976d415 LH |
1375 | unsigned char sha1[20], orig_sha1[20]; |
1376 | int flag = 0, logmoved = 0; | |
1377 | struct ref_lock *lock; | |
c976d415 | 1378 | struct stat loginfo; |
dfefa935 | 1379 | int log = !lstat(git_path("logs/%s", oldrefname), &loginfo); |
eca35a25 | 1380 | const char *symref = NULL; |
316b097a | 1381 | struct ref_cache *refs = get_ref_cache(NULL); |
c976d415 | 1382 | |
450d4c0f | 1383 | if (log && S_ISLNK(loginfo.st_mode)) |
dfefa935 | 1384 | return error("reflog for %s is a symlink", oldrefname); |
c976d415 | 1385 | |
dfefa935 | 1386 | symref = resolve_ref(oldrefname, orig_sha1, 1, &flag); |
eca35a25 | 1387 | if (flag & REF_ISSYMREF) |
fa58186c | 1388 | return error("refname %s is a symbolic ref, renaming it is not supported", |
dfefa935 | 1389 | oldrefname); |
eca35a25 | 1390 | if (!symref) |
dfefa935 | 1391 | return error("refname %s not found", oldrefname); |
c976d415 | 1392 | |
316b097a | 1393 | if (!is_refname_available(newrefname, oldrefname, get_packed_refs(refs))) |
c976d415 LH |
1394 | return 1; |
1395 | ||
316b097a | 1396 | if (!is_refname_available(newrefname, oldrefname, get_loose_refs(refs))) |
c976d415 LH |
1397 | return 1; |
1398 | ||
dfefa935 | 1399 | if (log && rename(git_path("logs/%s", oldrefname), git_path(TMP_RENAMED_LOG))) |
765c2258 | 1400 | return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s", |
dfefa935 | 1401 | oldrefname, strerror(errno)); |
c976d415 | 1402 | |
dfefa935 MH |
1403 | if (delete_ref(oldrefname, orig_sha1, REF_NODEREF)) { |
1404 | error("unable to delete old %s", oldrefname); | |
c976d415 LH |
1405 | goto rollback; |
1406 | } | |
1407 | ||
dfefa935 MH |
1408 | if (!read_ref_full(newrefname, sha1, 1, &flag) && |
1409 | delete_ref(newrefname, sha1, REF_NODEREF)) { | |
c976d415 | 1410 | if (errno==EISDIR) { |
dfefa935 MH |
1411 | if (remove_empty_directories(git_path("%s", newrefname))) { |
1412 | error("Directory not empty: %s", newrefname); | |
c976d415 LH |
1413 | goto rollback; |
1414 | } | |
1415 | } else { | |
dfefa935 | 1416 | error("unable to delete existing %s", newrefname); |
c976d415 LH |
1417 | goto rollback; |
1418 | } | |
1419 | } | |
1420 | ||
dfefa935 MH |
1421 | if (log && safe_create_leading_directories(git_path("logs/%s", newrefname))) { |
1422 | error("unable to create directory for %s", newrefname); | |
c976d415 LH |
1423 | goto rollback; |
1424 | } | |
1425 | ||
1426 | retry: | |
dfefa935 | 1427 | if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname))) { |
d9e74d57 JR |
1428 | if (errno==EISDIR || errno==ENOTDIR) { |
1429 | /* | |
1430 | * rename(a, b) when b is an existing | |
1431 | * directory ought to result in ISDIR, but | |
1432 | * Solaris 5.8 gives ENOTDIR. Sheesh. | |
1433 | */ | |
dfefa935 MH |
1434 | if (remove_empty_directories(git_path("logs/%s", newrefname))) { |
1435 | error("Directory not empty: logs/%s", newrefname); | |
c976d415 LH |
1436 | goto rollback; |
1437 | } | |
1438 | goto retry; | |
1439 | } else { | |
765c2258 | 1440 | error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s", |
dfefa935 | 1441 | newrefname, strerror(errno)); |
c976d415 LH |
1442 | goto rollback; |
1443 | } | |
1444 | } | |
1445 | logmoved = log; | |
1446 | ||
dfefa935 | 1447 | lock = lock_ref_sha1_basic(newrefname, NULL, 0, NULL); |
c976d415 | 1448 | if (!lock) { |
dfefa935 | 1449 | error("unable to lock %s for update", newrefname); |
c976d415 LH |
1450 | goto rollback; |
1451 | } | |
c976d415 LH |
1452 | lock->force_write = 1; |
1453 | hashcpy(lock->old_sha1, orig_sha1); | |
678d0f4c | 1454 | if (write_ref_sha1(lock, orig_sha1, logmsg)) { |
dfefa935 | 1455 | error("unable to write current sha1 into %s", newrefname); |
c976d415 LH |
1456 | goto rollback; |
1457 | } | |
1458 | ||
1459 | return 0; | |
1460 | ||
1461 | rollback: | |
dfefa935 | 1462 | lock = lock_ref_sha1_basic(oldrefname, NULL, 0, NULL); |
c976d415 | 1463 | if (!lock) { |
dfefa935 | 1464 | error("unable to lock %s for rollback", oldrefname); |
c976d415 LH |
1465 | goto rollbacklog; |
1466 | } | |
1467 | ||
1468 | lock->force_write = 1; | |
1469 | flag = log_all_ref_updates; | |
1470 | log_all_ref_updates = 0; | |
1471 | if (write_ref_sha1(lock, orig_sha1, NULL)) | |
dfefa935 | 1472 | error("unable to write current sha1 into %s", oldrefname); |
c976d415 LH |
1473 | log_all_ref_updates = flag; |
1474 | ||
1475 | rollbacklog: | |
dfefa935 | 1476 | if (logmoved && rename(git_path("logs/%s", newrefname), git_path("logs/%s", oldrefname))) |
c976d415 | 1477 | error("unable to restore logfile %s from %s: %s", |
dfefa935 | 1478 | oldrefname, newrefname, strerror(errno)); |
c976d415 | 1479 | if (!logmoved && log && |
dfefa935 | 1480 | rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldrefname))) |
765c2258 | 1481 | error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s", |
dfefa935 | 1482 | oldrefname, strerror(errno)); |
c976d415 LH |
1483 | |
1484 | return 1; | |
1485 | } | |
1486 | ||
435fc852 | 1487 | int close_ref(struct ref_lock *lock) |
b531394d BC |
1488 | { |
1489 | if (close_lock_file(lock->lk)) | |
1490 | return -1; | |
1491 | lock->lock_fd = -1; | |
1492 | return 0; | |
1493 | } | |
1494 | ||
435fc852 | 1495 | int commit_ref(struct ref_lock *lock) |
b531394d BC |
1496 | { |
1497 | if (commit_lock_file(lock->lk)) | |
1498 | return -1; | |
1499 | lock->lock_fd = -1; | |
1500 | return 0; | |
1501 | } | |
1502 | ||
e5f38ec3 | 1503 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 | 1504 | { |
4ed7cd3a BC |
1505 | /* Do not free lock->lk -- atexit() still looks at them */ |
1506 | if (lock->lk) | |
1507 | rollback_lock_file(lock->lk); | |
434cd0cd | 1508 | free(lock->ref_name); |
1655707c | 1509 | free(lock->orig_ref_name); |
4bd18c43 SP |
1510 | free(lock); |
1511 | } | |
1512 | ||
0ec29a47 JH |
1513 | /* |
1514 | * copy the reflog message msg to buf, which has been allocated sufficiently | |
1515 | * large, while cleaning up the whitespaces. Especially, convert LF to space, | |
1516 | * because reflog file is one line per entry. | |
1517 | */ | |
1518 | static int copy_msg(char *buf, const char *msg) | |
1519 | { | |
1520 | char *cp = buf; | |
1521 | char c; | |
1522 | int wasspace = 1; | |
1523 | ||
1524 | *cp++ = '\t'; | |
1525 | while ((c = *msg++)) { | |
1526 | if (wasspace && isspace(c)) | |
1527 | continue; | |
1528 | wasspace = isspace(c); | |
1529 | if (wasspace) | |
1530 | c = ' '; | |
1531 | *cp++ = c; | |
1532 | } | |
1533 | while (buf < cp && isspace(cp[-1])) | |
1534 | cp--; | |
1535 | *cp++ = '\n'; | |
1536 | return cp - buf; | |
1537 | } | |
1538 | ||
dfefa935 | 1539 | int log_ref_setup(const char *refname, char *logfile, int bufsize) |
6de08ae6 | 1540 | { |
859c3017 | 1541 | int logfd, oflags = O_APPEND | O_WRONLY; |
9a13f0b7 | 1542 | |
dfefa935 | 1543 | git_snpath(logfile, bufsize, "logs/%s", refname); |
4057deb5 | 1544 | if (log_all_ref_updates && |
dfefa935 MH |
1545 | (!prefixcmp(refname, "refs/heads/") || |
1546 | !prefixcmp(refname, "refs/remotes/") || | |
1547 | !prefixcmp(refname, "refs/notes/") || | |
1548 | !strcmp(refname, "HEAD"))) { | |
157aaea5 | 1549 | if (safe_create_leading_directories(logfile) < 0) |
6de08ae6 | 1550 | return error("unable to create directory for %s", |
157aaea5 | 1551 | logfile); |
6de08ae6 SP |
1552 | oflags |= O_CREAT; |
1553 | } | |
1554 | ||
157aaea5 | 1555 | logfd = open(logfile, oflags, 0666); |
6de08ae6 | 1556 | if (logfd < 0) { |
1974bf62 | 1557 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 1558 | return 0; |
3b463c3f JH |
1559 | |
1560 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
157aaea5 | 1561 | if (remove_empty_directories(logfile)) { |
3b463c3f | 1562 | return error("There are still logs under '%s'", |
157aaea5 | 1563 | logfile); |
3b463c3f | 1564 | } |
157aaea5 | 1565 | logfd = open(logfile, oflags, 0666); |
3b463c3f JH |
1566 | } |
1567 | ||
1568 | if (logfd < 0) | |
1569 | return error("Unable to append to %s: %s", | |
157aaea5 | 1570 | logfile, strerror(errno)); |
6de08ae6 SP |
1571 | } |
1572 | ||
157aaea5 | 1573 | adjust_shared_perm(logfile); |
859c3017 EM |
1574 | close(logfd); |
1575 | return 0; | |
1576 | } | |
443b92b6 | 1577 | |
dfefa935 | 1578 | static int log_ref_write(const char *refname, const unsigned char *old_sha1, |
859c3017 EM |
1579 | const unsigned char *new_sha1, const char *msg) |
1580 | { | |
1581 | int logfd, result, written, oflags = O_APPEND | O_WRONLY; | |
1582 | unsigned maxlen, len; | |
1583 | int msglen; | |
157aaea5 | 1584 | char log_file[PATH_MAX]; |
859c3017 EM |
1585 | char *logrec; |
1586 | const char *committer; | |
1587 | ||
1588 | if (log_all_ref_updates < 0) | |
1589 | log_all_ref_updates = !is_bare_repository(); | |
1590 | ||
dfefa935 | 1591 | result = log_ref_setup(refname, log_file, sizeof(log_file)); |
859c3017 EM |
1592 | if (result) |
1593 | return result; | |
1594 | ||
1595 | logfd = open(log_file, oflags); | |
1596 | if (logfd < 0) | |
1597 | return 0; | |
0ec29a47 | 1598 | msglen = msg ? strlen(msg) : 0; |
774751a8 | 1599 | committer = git_committer_info(0); |
8ac65937 JH |
1600 | maxlen = strlen(committer) + msglen + 100; |
1601 | logrec = xmalloc(maxlen); | |
1602 | len = sprintf(logrec, "%s %s %s\n", | |
9a13f0b7 NP |
1603 | sha1_to_hex(old_sha1), |
1604 | sha1_to_hex(new_sha1), | |
8ac65937 JH |
1605 | committer); |
1606 | if (msglen) | |
0ec29a47 | 1607 | len += copy_msg(logrec + len - 1, msg) - 1; |
93822c22 | 1608 | written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1; |
6de08ae6 | 1609 | free(logrec); |
91c8d590 | 1610 | if (close(logfd) != 0 || written != len) |
9a13f0b7 | 1611 | return error("Unable to append to %s", log_file); |
6de08ae6 SP |
1612 | return 0; |
1613 | } | |
1614 | ||
c3b0dec5 LT |
1615 | static int is_branch(const char *refname) |
1616 | { | |
1617 | return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/"); | |
1618 | } | |
1619 | ||
4bd18c43 SP |
1620 | int write_ref_sha1(struct ref_lock *lock, |
1621 | const unsigned char *sha1, const char *logmsg) | |
1622 | { | |
1623 | static char term = '\n'; | |
c3b0dec5 | 1624 | struct object *o; |
4bd18c43 SP |
1625 | |
1626 | if (!lock) | |
95fc7512 | 1627 | return -1; |
a89fccd2 | 1628 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
1629 | unlock_ref(lock); |
1630 | return 0; | |
95fc7512 | 1631 | } |
c3b0dec5 LT |
1632 | o = parse_object(sha1); |
1633 | if (!o) { | |
7be8b3ba | 1634 | error("Trying to write ref %s with nonexistent object %s", |
c3b0dec5 LT |
1635 | lock->ref_name, sha1_to_hex(sha1)); |
1636 | unlock_ref(lock); | |
1637 | return -1; | |
1638 | } | |
1639 | if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) { | |
1640 | error("Trying to write non-commit object %s to branch %s", | |
1641 | sha1_to_hex(sha1), lock->ref_name); | |
1642 | unlock_ref(lock); | |
1643 | return -1; | |
1644 | } | |
93822c22 AW |
1645 | if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
1646 | write_in_full(lock->lock_fd, &term, 1) != 1 | |
b531394d | 1647 | || close_ref(lock) < 0) { |
c33d5174 | 1648 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
1649 | unlock_ref(lock); |
1650 | return -1; | |
1651 | } | |
8bf90dc9 | 1652 | clear_loose_ref_cache(get_ref_cache(NULL)); |
bd104db1 NP |
1653 | if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 || |
1654 | (strcmp(lock->ref_name, lock->orig_ref_name) && | |
1655 | log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) { | |
6de08ae6 SP |
1656 | unlock_ref(lock); |
1657 | return -1; | |
1658 | } | |
605fac8b NP |
1659 | if (strcmp(lock->orig_ref_name, "HEAD") != 0) { |
1660 | /* | |
1661 | * Special hack: If a branch is updated directly and HEAD | |
1662 | * points to it (may happen on the remote side of a push | |
1663 | * for example) then logically the HEAD reflog should be | |
1664 | * updated too. | |
1665 | * A generic solution implies reverse symref information, | |
1666 | * but finding all symrefs pointing to the given branch | |
1667 | * would be rather costly for this rare event (the direct | |
1668 | * update of a branch) to be worth it. So let's cheat and | |
1669 | * check with HEAD only which should cover 99% of all usage | |
1670 | * scenarios (even 100% of the default ones). | |
1671 | */ | |
1672 | unsigned char head_sha1[20]; | |
1673 | int head_flag; | |
1674 | const char *head_ref; | |
1675 | head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag); | |
1676 | if (head_ref && (head_flag & REF_ISSYMREF) && | |
1677 | !strcmp(head_ref, lock->ref_name)) | |
1678 | log_ref_write("HEAD", lock->old_sha1, sha1, logmsg); | |
1679 | } | |
b531394d | 1680 | if (commit_ref(lock)) { |
434cd0cd | 1681 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
1682 | unlock_ref(lock); |
1683 | return -1; | |
1684 | } | |
4bd18c43 SP |
1685 | unlock_ref(lock); |
1686 | return 0; | |
95fc7512 | 1687 | } |
d556fae2 | 1688 | |
8b5157e4 NP |
1689 | int create_symref(const char *ref_target, const char *refs_heads_master, |
1690 | const char *logmsg) | |
41b625b0 NP |
1691 | { |
1692 | const char *lockpath; | |
1693 | char ref[1000]; | |
1694 | int fd, len, written; | |
a4f34cbb | 1695 | char *git_HEAD = git_pathdup("%s", ref_target); |
8b5157e4 NP |
1696 | unsigned char old_sha1[20], new_sha1[20]; |
1697 | ||
1698 | if (logmsg && read_ref(ref_target, old_sha1)) | |
1699 | hashclr(old_sha1); | |
41b625b0 | 1700 | |
d48744d1 JH |
1701 | if (safe_create_leading_directories(git_HEAD) < 0) |
1702 | return error("unable to create directory for %s", git_HEAD); | |
1703 | ||
41b625b0 NP |
1704 | #ifndef NO_SYMLINK_HEAD |
1705 | if (prefer_symlink_refs) { | |
1706 | unlink(git_HEAD); | |
1707 | if (!symlink(refs_heads_master, git_HEAD)) | |
8b5157e4 | 1708 | goto done; |
41b625b0 NP |
1709 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); |
1710 | } | |
1711 | #endif | |
1712 | ||
1713 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); | |
1714 | if (sizeof(ref) <= len) { | |
1715 | error("refname too long: %s", refs_heads_master); | |
47fc52e2 | 1716 | goto error_free_return; |
41b625b0 NP |
1717 | } |
1718 | lockpath = mkpath("%s.lock", git_HEAD); | |
1719 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
1720 | if (fd < 0) { | |
1721 | error("Unable to open %s for writing", lockpath); | |
47fc52e2 | 1722 | goto error_free_return; |
41b625b0 NP |
1723 | } |
1724 | written = write_in_full(fd, ref, len); | |
91c8d590 | 1725 | if (close(fd) != 0 || written != len) { |
41b625b0 | 1726 | error("Unable to write to %s", lockpath); |
47fc52e2 | 1727 | goto error_unlink_return; |
41b625b0 NP |
1728 | } |
1729 | if (rename(lockpath, git_HEAD) < 0) { | |
41b625b0 | 1730 | error("Unable to create %s", git_HEAD); |
47fc52e2 | 1731 | goto error_unlink_return; |
41b625b0 NP |
1732 | } |
1733 | if (adjust_shared_perm(git_HEAD)) { | |
41b625b0 | 1734 | error("Unable to fix permissions on %s", lockpath); |
47fc52e2 | 1735 | error_unlink_return: |
691f1a28 | 1736 | unlink_or_warn(lockpath); |
47fc52e2 JH |
1737 | error_free_return: |
1738 | free(git_HEAD); | |
1739 | return -1; | |
41b625b0 | 1740 | } |
8b5157e4 | 1741 | |
ee96d11b | 1742 | #ifndef NO_SYMLINK_HEAD |
8b5157e4 | 1743 | done: |
ee96d11b | 1744 | #endif |
8b5157e4 NP |
1745 | if (logmsg && !read_ref(refs_heads_master, new_sha1)) |
1746 | log_ref_write(ref_target, old_sha1, new_sha1, logmsg); | |
1747 | ||
47fc52e2 | 1748 | free(git_HEAD); |
41b625b0 NP |
1749 | return 0; |
1750 | } | |
1751 | ||
16d7cc90 JH |
1752 | static char *ref_msg(const char *line, const char *endp) |
1753 | { | |
1754 | const char *ep; | |
16d7cc90 | 1755 | line += 82; |
182af834 PH |
1756 | ep = memchr(line, '\n', endp - line); |
1757 | if (!ep) | |
1758 | ep = endp; | |
1759 | return xmemdupz(line, ep - line); | |
16d7cc90 JH |
1760 | } |
1761 | ||
dfefa935 MH |
1762 | int read_ref_at(const char *refname, unsigned long at_time, int cnt, |
1763 | unsigned char *sha1, char **msg, | |
1764 | unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt) | |
d556fae2 | 1765 | { |
e5229042 | 1766 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 | 1767 | char *tz_c; |
e29cb53a | 1768 | int logfd, tz, reccnt = 0; |
d556fae2 SP |
1769 | struct stat st; |
1770 | unsigned long date; | |
e5229042 | 1771 | unsigned char logged_sha1[20]; |
cb48cb58 | 1772 | void *log_mapped; |
dc49cd76 | 1773 | size_t mapsz; |
d556fae2 | 1774 | |
dfefa935 | 1775 | logfile = git_path("logs/%s", refname); |
d556fae2 SP |
1776 | logfd = open(logfile, O_RDONLY, 0); |
1777 | if (logfd < 0) | |
d824cbba | 1778 | die_errno("Unable to read log '%s'", logfile); |
d556fae2 SP |
1779 | fstat(logfd, &st); |
1780 | if (!st.st_size) | |
1781 | die("Log %s is empty.", logfile); | |
dc49cd76 SP |
1782 | mapsz = xsize_t(st.st_size); |
1783 | log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0); | |
cb48cb58 | 1784 | logdata = log_mapped; |
d556fae2 SP |
1785 | close(logfd); |
1786 | ||
e5229042 | 1787 | lastrec = NULL; |
d556fae2 SP |
1788 | rec = logend = logdata + st.st_size; |
1789 | while (logdata < rec) { | |
e29cb53a | 1790 | reccnt++; |
d556fae2 SP |
1791 | if (logdata < rec && *(rec-1) == '\n') |
1792 | rec--; | |
e5229042 SP |
1793 | lastgt = NULL; |
1794 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 1795 | rec--; |
e5229042 SP |
1796 | if (*rec == '>') |
1797 | lastgt = rec; | |
1798 | } | |
1799 | if (!lastgt) | |
d556fae2 | 1800 | die("Log %s is corrupt.", logfile); |
e5229042 | 1801 | date = strtoul(lastgt + 1, &tz_c, 10); |
ab2a1a32 | 1802 | if (date <= at_time || cnt == 0) { |
76a44c5c | 1803 | tz = strtoul(tz_c, NULL, 10); |
16d7cc90 JH |
1804 | if (msg) |
1805 | *msg = ref_msg(rec, logend); | |
1806 | if (cutoff_time) | |
1807 | *cutoff_time = date; | |
1808 | if (cutoff_tz) | |
1809 | *cutoff_tz = tz; | |
1810 | if (cutoff_cnt) | |
76a44c5c | 1811 | *cutoff_cnt = reccnt - 1; |
e5229042 SP |
1812 | if (lastrec) { |
1813 | if (get_sha1_hex(lastrec, logged_sha1)) | |
1814 | die("Log %s is corrupt.", logfile); | |
1815 | if (get_sha1_hex(rec + 41, sha1)) | |
1816 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1817 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1818 | warning("Log %s has gap after %s.", |
73013afd | 1819 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 | 1820 | } |
e5f38ec3 JH |
1821 | } |
1822 | else if (date == at_time) { | |
e5229042 SP |
1823 | if (get_sha1_hex(rec + 41, sha1)) |
1824 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
1825 | } |
1826 | else { | |
e5229042 SP |
1827 | if (get_sha1_hex(rec + 41, logged_sha1)) |
1828 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 1829 | if (hashcmp(logged_sha1, sha1)) { |
edbc25c5 | 1830 | warning("Log %s unexpectedly ended on %s.", |
73013afd | 1831 | logfile, show_date(date, tz, DATE_RFC2822)); |
e5229042 SP |
1832 | } |
1833 | } | |
dc49cd76 | 1834 | munmap(log_mapped, mapsz); |
d556fae2 SP |
1835 | return 0; |
1836 | } | |
e5229042 | 1837 | lastrec = rec; |
ab2a1a32 JH |
1838 | if (cnt > 0) |
1839 | cnt--; | |
d556fae2 SP |
1840 | } |
1841 | ||
e5229042 SP |
1842 | rec = logdata; |
1843 | while (rec < logend && *rec != '>' && *rec != '\n') | |
1844 | rec++; | |
1845 | if (rec == logend || *rec == '\n') | |
d556fae2 | 1846 | die("Log %s is corrupt.", logfile); |
e5229042 | 1847 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
1848 | tz = strtoul(tz_c, NULL, 10); |
1849 | if (get_sha1_hex(logdata, sha1)) | |
1850 | die("Log %s is corrupt.", logfile); | |
d1a4489a JK |
1851 | if (is_null_sha1(sha1)) { |
1852 | if (get_sha1_hex(logdata + 41, sha1)) | |
1853 | die("Log %s is corrupt.", logfile); | |
1854 | } | |
16d7cc90 JH |
1855 | if (msg) |
1856 | *msg = ref_msg(logdata, logend); | |
dc49cd76 | 1857 | munmap(log_mapped, mapsz); |
16d7cc90 JH |
1858 | |
1859 | if (cutoff_time) | |
1860 | *cutoff_time = date; | |
1861 | if (cutoff_tz) | |
1862 | *cutoff_tz = tz; | |
1863 | if (cutoff_cnt) | |
1864 | *cutoff_cnt = reccnt; | |
1865 | return 1; | |
d556fae2 | 1866 | } |
2ff81662 | 1867 | |
dfefa935 | 1868 | int for_each_recent_reflog_ent(const char *refname, each_reflog_ent_fn fn, long ofs, void *cb_data) |
2ff81662 JH |
1869 | { |
1870 | const char *logfile; | |
1871 | FILE *logfp; | |
8ca78803 | 1872 | struct strbuf sb = STRBUF_INIT; |
2266bf27 | 1873 | int ret = 0; |
2ff81662 | 1874 | |
dfefa935 | 1875 | logfile = git_path("logs/%s", refname); |
2ff81662 JH |
1876 | logfp = fopen(logfile, "r"); |
1877 | if (!logfp) | |
883d60fa | 1878 | return -1; |
101d15e0 JH |
1879 | |
1880 | if (ofs) { | |
1881 | struct stat statbuf; | |
1882 | if (fstat(fileno(logfp), &statbuf) || | |
1883 | statbuf.st_size < ofs || | |
1884 | fseek(logfp, -ofs, SEEK_END) || | |
8ca78803 | 1885 | strbuf_getwholeline(&sb, logfp, '\n')) { |
9d33f7c2 | 1886 | fclose(logfp); |
8ca78803 | 1887 | strbuf_release(&sb); |
101d15e0 | 1888 | return -1; |
9d33f7c2 | 1889 | } |
101d15e0 JH |
1890 | } |
1891 | ||
8ca78803 | 1892 | while (!strbuf_getwholeline(&sb, logfp, '\n')) { |
2ff81662 | 1893 | unsigned char osha1[20], nsha1[20]; |
883d60fa JS |
1894 | char *email_end, *message; |
1895 | unsigned long timestamp; | |
8ca78803 | 1896 | int tz; |
2ff81662 JH |
1897 | |
1898 | /* old SP new SP name <email> SP time TAB msg LF */ | |
8ca78803 RS |
1899 | if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' || |
1900 | get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' || | |
1901 | get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' || | |
1902 | !(email_end = strchr(sb.buf + 82, '>')) || | |
883d60fa JS |
1903 | email_end[1] != ' ' || |
1904 | !(timestamp = strtoul(email_end + 2, &message, 10)) || | |
1905 | !message || message[0] != ' ' || | |
1906 | (message[1] != '+' && message[1] != '-') || | |
1907 | !isdigit(message[2]) || !isdigit(message[3]) || | |
b4dd4856 | 1908 | !isdigit(message[4]) || !isdigit(message[5])) |
2ff81662 | 1909 | continue; /* corrupt? */ |
883d60fa JS |
1910 | email_end[1] = '\0'; |
1911 | tz = strtol(message + 1, NULL, 10); | |
b4dd4856 JS |
1912 | if (message[6] != '\t') |
1913 | message += 6; | |
1914 | else | |
1915 | message += 7; | |
8ca78803 RS |
1916 | ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message, |
1917 | cb_data); | |
883d60fa | 1918 | if (ret) |
2266bf27 | 1919 | break; |
2ff81662 JH |
1920 | } |
1921 | fclose(logfp); | |
8ca78803 | 1922 | strbuf_release(&sb); |
2266bf27 | 1923 | return ret; |
2ff81662 | 1924 | } |
e29cb53a | 1925 | |
dfefa935 | 1926 | int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data) |
101d15e0 | 1927 | { |
dfefa935 | 1928 | return for_each_recent_reflog_ent(refname, fn, 0, cb_data); |
101d15e0 JH |
1929 | } |
1930 | ||
eb8381c8 NP |
1931 | static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data) |
1932 | { | |
1933 | DIR *dir = opendir(git_path("logs/%s", base)); | |
fcee5a14 | 1934 | int retval = 0; |
eb8381c8 NP |
1935 | |
1936 | if (dir) { | |
1937 | struct dirent *de; | |
1938 | int baselen = strlen(base); | |
1939 | char *log = xmalloc(baselen + 257); | |
1940 | ||
1941 | memcpy(log, base, baselen); | |
1942 | if (baselen && base[baselen-1] != '/') | |
1943 | log[baselen++] = '/'; | |
1944 | ||
1945 | while ((de = readdir(dir)) != NULL) { | |
1946 | struct stat st; | |
1947 | int namelen; | |
1948 | ||
1949 | if (de->d_name[0] == '.') | |
1950 | continue; | |
1951 | namelen = strlen(de->d_name); | |
1952 | if (namelen > 255) | |
1953 | continue; | |
1954 | if (has_extension(de->d_name, ".lock")) | |
1955 | continue; | |
1956 | memcpy(log + baselen, de->d_name, namelen+1); | |
1957 | if (stat(git_path("logs/%s", log), &st) < 0) | |
1958 | continue; | |
1959 | if (S_ISDIR(st.st_mode)) { | |
1960 | retval = do_for_each_reflog(log, fn, cb_data); | |
1961 | } else { | |
1962 | unsigned char sha1[20]; | |
c6893323 | 1963 | if (read_ref_full(log, sha1, 0, NULL)) |
eb8381c8 NP |
1964 | retval = error("bad ref for %s", log); |
1965 | else | |
1966 | retval = fn(log, sha1, 0, cb_data); | |
1967 | } | |
1968 | if (retval) | |
1969 | break; | |
1970 | } | |
1971 | free(log); | |
1972 | closedir(dir); | |
1973 | } | |
acb39f64 | 1974 | else if (*base) |
fcee5a14 | 1975 | return errno; |
eb8381c8 NP |
1976 | return retval; |
1977 | } | |
1978 | ||
1979 | int for_each_reflog(each_ref_fn fn, void *cb_data) | |
1980 | { | |
1981 | return do_for_each_reflog("", fn, cb_data); | |
1982 | } | |
3d9f037c CR |
1983 | |
1984 | int update_ref(const char *action, const char *refname, | |
1985 | const unsigned char *sha1, const unsigned char *oldval, | |
1986 | int flags, enum action_on_err onerr) | |
1987 | { | |
1988 | static struct ref_lock *lock; | |
1989 | lock = lock_any_ref_for_update(refname, oldval, flags); | |
1990 | if (!lock) { | |
1991 | const char *str = "Cannot lock the ref '%s'."; | |
1992 | switch (onerr) { | |
1993 | case MSG_ON_ERR: error(str, refname); break; | |
1994 | case DIE_ON_ERR: die(str, refname); break; | |
1995 | case QUIET_ON_ERR: break; | |
1996 | } | |
1997 | return 1; | |
1998 | } | |
1999 | if (write_ref_sha1(lock, sha1, action) < 0) { | |
2000 | const char *str = "Cannot update the ref '%s'."; | |
2001 | switch (onerr) { | |
2002 | case MSG_ON_ERR: error(str, refname); break; | |
2003 | case DIE_ON_ERR: die(str, refname); break; | |
2004 | case QUIET_ON_ERR: break; | |
2005 | } | |
2006 | return 1; | |
2007 | } | |
2008 | return 0; | |
2009 | } | |
cda69f48 | 2010 | |
2c5c66be | 2011 | int ref_exists(const char *refname) |
c17b2294 JH |
2012 | { |
2013 | unsigned char sha1[20]; | |
2014 | return !!resolve_ref(refname, sha1, 1, NULL); | |
2015 | } | |
2016 | ||
5483f799 | 2017 | struct ref *find_ref_by_name(const struct ref *list, const char *name) |
cda69f48 JK |
2018 | { |
2019 | for ( ; list; list = list->next) | |
2020 | if (!strcmp(list->name, name)) | |
5483f799 | 2021 | return (struct ref *)list; |
cda69f48 JK |
2022 | return NULL; |
2023 | } | |
7c2b3029 JK |
2024 | |
2025 | /* | |
2026 | * generate a format suitable for scanf from a ref_rev_parse_rules | |
2027 | * rule, that is replace the "%.*s" spec with a "%s" spec | |
2028 | */ | |
2029 | static void gen_scanf_fmt(char *scanf_fmt, const char *rule) | |
2030 | { | |
2031 | char *spec; | |
2032 | ||
2033 | spec = strstr(rule, "%.*s"); | |
2034 | if (!spec || strstr(spec + 4, "%.*s")) | |
2035 | die("invalid rule in ref_rev_parse_rules: %s", rule); | |
2036 | ||
2037 | /* copy all until spec */ | |
2038 | strncpy(scanf_fmt, rule, spec - rule); | |
2039 | scanf_fmt[spec - rule] = '\0'; | |
2040 | /* copy new spec */ | |
2041 | strcat(scanf_fmt, "%s"); | |
2042 | /* copy remaining rule */ | |
2043 | strcat(scanf_fmt, spec + 4); | |
2044 | ||
2045 | return; | |
2046 | } | |
2047 | ||
dfefa935 | 2048 | char *shorten_unambiguous_ref(const char *refname, int strict) |
7c2b3029 JK |
2049 | { |
2050 | int i; | |
2051 | static char **scanf_fmts; | |
2052 | static int nr_rules; | |
2053 | char *short_name; | |
2054 | ||
2055 | /* pre generate scanf formats from ref_rev_parse_rules[] */ | |
2056 | if (!nr_rules) { | |
2057 | size_t total_len = 0; | |
2058 | ||
2059 | /* the rule list is NULL terminated, count them first */ | |
2060 | for (; ref_rev_parse_rules[nr_rules]; nr_rules++) | |
2061 | /* no +1 because strlen("%s") < strlen("%.*s") */ | |
2062 | total_len += strlen(ref_rev_parse_rules[nr_rules]); | |
2063 | ||
2064 | scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len); | |
2065 | ||
2066 | total_len = 0; | |
2067 | for (i = 0; i < nr_rules; i++) { | |
2068 | scanf_fmts[i] = (char *)&scanf_fmts[nr_rules] | |
2069 | + total_len; | |
2070 | gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]); | |
2071 | total_len += strlen(ref_rev_parse_rules[i]); | |
2072 | } | |
2073 | } | |
2074 | ||
2075 | /* bail out if there are no rules */ | |
2076 | if (!nr_rules) | |
dfefa935 | 2077 | return xstrdup(refname); |
7c2b3029 | 2078 | |
dfefa935 MH |
2079 | /* buffer for scanf result, at most refname must fit */ |
2080 | short_name = xstrdup(refname); | |
7c2b3029 JK |
2081 | |
2082 | /* skip first rule, it will always match */ | |
2083 | for (i = nr_rules - 1; i > 0 ; --i) { | |
2084 | int j; | |
6e7b3309 | 2085 | int rules_to_fail = i; |
7c2b3029 JK |
2086 | int short_name_len; |
2087 | ||
dfefa935 | 2088 | if (1 != sscanf(refname, scanf_fmts[i], short_name)) |
7c2b3029 JK |
2089 | continue; |
2090 | ||
2091 | short_name_len = strlen(short_name); | |
2092 | ||
6e7b3309 BW |
2093 | /* |
2094 | * in strict mode, all (except the matched one) rules | |
2095 | * must fail to resolve to a valid non-ambiguous ref | |
2096 | */ | |
2097 | if (strict) | |
2098 | rules_to_fail = nr_rules; | |
2099 | ||
7c2b3029 JK |
2100 | /* |
2101 | * check if the short name resolves to a valid ref, | |
2102 | * but use only rules prior to the matched one | |
2103 | */ | |
6e7b3309 | 2104 | for (j = 0; j < rules_to_fail; j++) { |
7c2b3029 | 2105 | const char *rule = ref_rev_parse_rules[j]; |
7c2b3029 JK |
2106 | char refname[PATH_MAX]; |
2107 | ||
6e7b3309 BW |
2108 | /* skip matched rule */ |
2109 | if (i == j) | |
2110 | continue; | |
2111 | ||
7c2b3029 JK |
2112 | /* |
2113 | * the short name is ambiguous, if it resolves | |
2114 | * (with this previous rule) to a valid ref | |
2115 | * read_ref() returns 0 on success | |
2116 | */ | |
2117 | mksnpath(refname, sizeof(refname), | |
2118 | rule, short_name_len, short_name); | |
c6893323 | 2119 | if (ref_exists(refname)) |
7c2b3029 JK |
2120 | break; |
2121 | } | |
2122 | ||
2123 | /* | |
2124 | * short name is non-ambiguous if all previous rules | |
2125 | * haven't resolved to a valid ref | |
2126 | */ | |
6e7b3309 | 2127 | if (j == rules_to_fail) |
7c2b3029 JK |
2128 | return short_name; |
2129 | } | |
2130 | ||
2131 | free(short_name); | |
dfefa935 | 2132 | return xstrdup(refname); |
7c2b3029 | 2133 | } |