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Commit | Line | Data |
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95fc7512 DB |
1 | #include "refs.h" |
2 | #include "cache.h" | |
cf0adba7 JH |
3 | #include "object.h" |
4 | #include "tag.h" | |
95fc7512 DB |
5 | |
6 | #include <errno.h> | |
7 | ||
e1e22e37 LT |
8 | struct ref_list { |
9 | struct ref_list *next; | |
cf0adba7 | 10 | unsigned char flag; /* ISSYMREF? ISPACKED? ISPEELED? */ |
e1e22e37 LT |
11 | unsigned char sha1[20]; |
12 | char name[FLEX_ARRAY]; | |
13 | }; | |
14 | ||
cf0adba7 | 15 | static const char *parse_ref_line(char *line, unsigned char *sha1, int *flag) |
e1e22e37 LT |
16 | { |
17 | /* | |
18 | * 42: the answer to everything. | |
19 | * | |
20 | * In this case, it happens to be the answer to | |
21 | * 40 (length of sha1 hex representation) | |
22 | * +1 (space in between hex and name) | |
23 | * +1 (newline at the end of the line) | |
24 | */ | |
25 | int len = strlen(line) - 42; | |
cf0adba7 | 26 | int peeled = 0; |
e1e22e37 LT |
27 | |
28 | if (len <= 0) | |
29 | return NULL; | |
30 | if (get_sha1_hex(line, sha1) < 0) | |
31 | return NULL; | |
32 | if (!isspace(line[40])) | |
33 | return NULL; | |
34 | line += 41; | |
cf0adba7 JH |
35 | |
36 | if (isspace(*line)) { | |
37 | /* "SHA-1 SP SP refs/tags/tagname^{} LF"? */ | |
38 | line++; | |
39 | len--; | |
40 | peeled = 1; | |
41 | } | |
e1e22e37 LT |
42 | if (line[len] != '\n') |
43 | return NULL; | |
44 | line[len] = 0; | |
cf0adba7 JH |
45 | |
46 | if (peeled && (len < 3 || strcmp(line + len - 3, "^{}"))) | |
47 | return NULL; | |
48 | ||
49 | if (!peeled) | |
50 | *flag &= ~REF_ISPEELED; | |
51 | else | |
52 | *flag |= REF_ISPEELED; | |
e1e22e37 LT |
53 | return line; |
54 | } | |
55 | ||
8da19775 JH |
56 | static struct ref_list *add_ref(const char *name, const unsigned char *sha1, |
57 | int flag, struct ref_list *list) | |
e1e22e37 LT |
58 | { |
59 | int len; | |
60 | struct ref_list **p = &list, *entry; | |
61 | ||
62 | /* Find the place to insert the ref into.. */ | |
63 | while ((entry = *p) != NULL) { | |
64 | int cmp = strcmp(entry->name, name); | |
65 | if (cmp > 0) | |
66 | break; | |
67 | ||
68 | /* Same as existing entry? */ | |
69 | if (!cmp) | |
70 | return list; | |
71 | p = &entry->next; | |
72 | } | |
73 | ||
74 | /* Allocate it and add it in.. */ | |
75 | len = strlen(name) + 1; | |
76 | entry = xmalloc(sizeof(struct ref_list) + len); | |
77 | hashcpy(entry->sha1, sha1); | |
78 | memcpy(entry->name, name, len); | |
8da19775 | 79 | entry->flag = flag; |
e1e22e37 LT |
80 | entry->next = *p; |
81 | *p = entry; | |
82 | return list; | |
83 | } | |
84 | ||
5e290ff7 JH |
85 | /* |
86 | * Future: need to be in "struct repository" | |
87 | * when doing a full libification. | |
88 | */ | |
89 | struct cached_refs { | |
90 | char did_loose; | |
91 | char did_packed; | |
92 | struct ref_list *loose; | |
93 | struct ref_list *packed; | |
94 | } cached_refs; | |
95 | ||
96 | static void free_ref_list(struct ref_list *list) | |
97 | { | |
98 | struct ref_list *next; | |
99 | for ( ; list; list = next) { | |
100 | next = list->next; | |
101 | free(list); | |
102 | } | |
103 | } | |
104 | ||
105 | static void invalidate_cached_refs(void) | |
e1e22e37 | 106 | { |
5e290ff7 JH |
107 | struct cached_refs *ca = &cached_refs; |
108 | ||
109 | if (ca->did_loose && ca->loose) | |
110 | free_ref_list(ca->loose); | |
111 | if (ca->did_packed && ca->packed) | |
112 | free_ref_list(ca->packed); | |
113 | ca->loose = ca->packed = NULL; | |
114 | ca->did_loose = ca->did_packed = 0; | |
115 | } | |
e1e22e37 | 116 | |
5e290ff7 JH |
117 | static struct ref_list *get_packed_refs(void) |
118 | { | |
119 | if (!cached_refs.did_packed) { | |
120 | struct ref_list *refs = NULL; | |
e1e22e37 LT |
121 | FILE *f = fopen(git_path("packed-refs"), "r"); |
122 | if (f) { | |
123 | struct ref_list *list = NULL; | |
124 | char refline[PATH_MAX]; | |
125 | while (fgets(refline, sizeof(refline), f)) { | |
126 | unsigned char sha1[20]; | |
cf0adba7 JH |
127 | int flag = REF_ISPACKED; |
128 | const char *name = | |
129 | parse_ref_line(refline, sha1, &flag); | |
e1e22e37 LT |
130 | if (!name) |
131 | continue; | |
cf0adba7 | 132 | list = add_ref(name, sha1, flag, list); |
e1e22e37 LT |
133 | } |
134 | fclose(f); | |
135 | refs = list; | |
136 | } | |
5e290ff7 JH |
137 | cached_refs.packed = refs; |
138 | cached_refs.did_packed = 1; | |
e1e22e37 | 139 | } |
5e290ff7 | 140 | return cached_refs.packed; |
e1e22e37 LT |
141 | } |
142 | ||
143 | static struct ref_list *get_ref_dir(const char *base, struct ref_list *list) | |
144 | { | |
145 | DIR *dir = opendir(git_path("%s", base)); | |
146 | ||
147 | if (dir) { | |
148 | struct dirent *de; | |
149 | int baselen = strlen(base); | |
ed378ec7 | 150 | char *ref = xmalloc(baselen + 257); |
e1e22e37 | 151 | |
ed378ec7 | 152 | memcpy(ref, base, baselen); |
e1e22e37 | 153 | if (baselen && base[baselen-1] != '/') |
ed378ec7 | 154 | ref[baselen++] = '/'; |
e1e22e37 LT |
155 | |
156 | while ((de = readdir(dir)) != NULL) { | |
157 | unsigned char sha1[20]; | |
158 | struct stat st; | |
8da19775 | 159 | int flag; |
e1e22e37 LT |
160 | int namelen; |
161 | ||
162 | if (de->d_name[0] == '.') | |
163 | continue; | |
164 | namelen = strlen(de->d_name); | |
165 | if (namelen > 255) | |
166 | continue; | |
167 | if (has_extension(de->d_name, ".lock")) | |
168 | continue; | |
ed378ec7 LT |
169 | memcpy(ref + baselen, de->d_name, namelen+1); |
170 | if (stat(git_path("%s", ref), &st) < 0) | |
e1e22e37 LT |
171 | continue; |
172 | if (S_ISDIR(st.st_mode)) { | |
ed378ec7 | 173 | list = get_ref_dir(ref, list); |
e1e22e37 LT |
174 | continue; |
175 | } | |
8da19775 | 176 | if (!resolve_ref(ref, sha1, 1, &flag)) { |
ed378ec7 | 177 | error("%s points nowhere!", ref); |
e1e22e37 LT |
178 | continue; |
179 | } | |
8da19775 | 180 | list = add_ref(ref, sha1, flag, list); |
e1e22e37 | 181 | } |
ed378ec7 | 182 | free(ref); |
e1e22e37 LT |
183 | closedir(dir); |
184 | } | |
185 | return list; | |
186 | } | |
187 | ||
188 | static struct ref_list *get_loose_refs(void) | |
189 | { | |
5e290ff7 JH |
190 | if (!cached_refs.did_loose) { |
191 | cached_refs.loose = get_ref_dir("refs", NULL); | |
192 | cached_refs.did_loose = 1; | |
e1e22e37 | 193 | } |
5e290ff7 | 194 | return cached_refs.loose; |
e1e22e37 LT |
195 | } |
196 | ||
ca8db142 LT |
197 | /* We allow "recursive" symbolic refs. Only within reason, though */ |
198 | #define MAXDEPTH 5 | |
199 | ||
8da19775 | 200 | const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag) |
8a65ff76 | 201 | { |
a876ed83 JH |
202 | int depth = MAXDEPTH, len; |
203 | char buffer[256]; | |
ed378ec7 | 204 | static char ref_buffer[256]; |
ca8db142 | 205 | |
8da19775 JH |
206 | if (flag) |
207 | *flag = 0; | |
208 | ||
a876ed83 | 209 | for (;;) { |
ed378ec7 | 210 | const char *path = git_path("%s", ref); |
a876ed83 JH |
211 | struct stat st; |
212 | char *buf; | |
213 | int fd; | |
8a65ff76 | 214 | |
a876ed83 JH |
215 | if (--depth < 0) |
216 | return NULL; | |
ca8db142 | 217 | |
a876ed83 JH |
218 | /* Special case: non-existing file. |
219 | * Not having the refs/heads/new-branch is OK | |
220 | * if we are writing into it, so is .git/HEAD | |
221 | * that points at refs/heads/master still to be | |
222 | * born. It is NOT OK if we are resolving for | |
223 | * reading. | |
224 | */ | |
225 | if (lstat(path, &st) < 0) { | |
434cd0cd LT |
226 | struct ref_list *list = get_packed_refs(); |
227 | while (list) { | |
cf0adba7 JH |
228 | if (!(list->flag & REF_ISPEELED) && |
229 | !strcmp(ref, list->name)) { | |
434cd0cd | 230 | hashcpy(sha1, list->sha1); |
8da19775 JH |
231 | if (flag) |
232 | *flag |= REF_ISPACKED; | |
434cd0cd LT |
233 | return ref; |
234 | } | |
235 | list = list->next; | |
236 | } | |
a876ed83 JH |
237 | if (reading || errno != ENOENT) |
238 | return NULL; | |
e702496e | 239 | hashclr(sha1); |
ed378ec7 | 240 | return ref; |
a876ed83 | 241 | } |
ca8db142 | 242 | |
a876ed83 JH |
243 | /* Follow "normalized" - ie "refs/.." symlinks by hand */ |
244 | if (S_ISLNK(st.st_mode)) { | |
245 | len = readlink(path, buffer, sizeof(buffer)-1); | |
246 | if (len >= 5 && !memcmp("refs/", buffer, 5)) { | |
ed378ec7 LT |
247 | buffer[len] = 0; |
248 | strcpy(ref_buffer, buffer); | |
249 | ref = ref_buffer; | |
8da19775 JH |
250 | if (flag) |
251 | *flag |= REF_ISSYMREF; | |
a876ed83 JH |
252 | continue; |
253 | } | |
ca8db142 | 254 | } |
a876ed83 | 255 | |
7a21632f DS |
256 | /* Is it a directory? */ |
257 | if (S_ISDIR(st.st_mode)) { | |
258 | errno = EISDIR; | |
259 | return NULL; | |
260 | } | |
261 | ||
a876ed83 JH |
262 | /* |
263 | * Anything else, just open it and try to use it as | |
264 | * a ref | |
265 | */ | |
266 | fd = open(path, O_RDONLY); | |
267 | if (fd < 0) | |
268 | return NULL; | |
269 | len = read(fd, buffer, sizeof(buffer)-1); | |
270 | close(fd); | |
271 | ||
272 | /* | |
273 | * Is it a symbolic ref? | |
274 | */ | |
275 | if (len < 4 || memcmp("ref:", buffer, 4)) | |
276 | break; | |
277 | buf = buffer + 4; | |
278 | len -= 4; | |
279 | while (len && isspace(*buf)) | |
280 | buf++, len--; | |
281 | while (len && isspace(buf[len-1])) | |
ed378ec7 LT |
282 | len--; |
283 | buf[len] = 0; | |
284 | memcpy(ref_buffer, buf, len + 1); | |
285 | ref = ref_buffer; | |
8da19775 JH |
286 | if (flag) |
287 | *flag |= REF_ISSYMREF; | |
8a65ff76 | 288 | } |
a876ed83 JH |
289 | if (len < 40 || get_sha1_hex(buffer, sha1)) |
290 | return NULL; | |
ed378ec7 | 291 | return ref; |
a876ed83 JH |
292 | } |
293 | ||
ed378ec7 | 294 | int create_symref(const char *ref_target, const char *refs_heads_master) |
8098a178 | 295 | { |
8098a178 JH |
296 | const char *lockpath; |
297 | char ref[1000]; | |
298 | int fd, len, written; | |
ed378ec7 | 299 | const char *git_HEAD = git_path("%s", ref_target); |
8098a178 | 300 | |
9f0bb90d JH |
301 | #ifndef NO_SYMLINK_HEAD |
302 | if (prefer_symlink_refs) { | |
f8348be3 JS |
303 | unlink(git_HEAD); |
304 | if (!symlink(refs_heads_master, git_HEAD)) | |
305 | return 0; | |
306 | fprintf(stderr, "no symlink - falling back to symbolic ref\n"); | |
307 | } | |
303958dc JS |
308 | #endif |
309 | ||
8098a178 JH |
310 | len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master); |
311 | if (sizeof(ref) <= len) { | |
312 | error("refname too long: %s", refs_heads_master); | |
313 | return -1; | |
314 | } | |
315 | lockpath = mkpath("%s.lock", git_HEAD); | |
316 | fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666); | |
317 | written = write(fd, ref, len); | |
318 | close(fd); | |
319 | if (written != len) { | |
320 | unlink(lockpath); | |
321 | error("Unable to write to %s", lockpath); | |
322 | return -2; | |
323 | } | |
324 | if (rename(lockpath, git_HEAD) < 0) { | |
325 | unlink(lockpath); | |
326 | error("Unable to create %s", git_HEAD); | |
327 | return -3; | |
328 | } | |
138086a7 JH |
329 | if (adjust_shared_perm(git_HEAD)) { |
330 | unlink(lockpath); | |
331 | error("Unable to fix permissions on %s", lockpath); | |
332 | return -4; | |
333 | } | |
8098a178 | 334 | return 0; |
8098a178 JH |
335 | } |
336 | ||
ed378ec7 | 337 | int read_ref(const char *ref, unsigned char *sha1) |
a876ed83 | 338 | { |
8da19775 | 339 | if (resolve_ref(ref, sha1, 1, NULL)) |
a876ed83 JH |
340 | return 0; |
341 | return -1; | |
8a65ff76 LT |
342 | } |
343 | ||
ef06b918 JH |
344 | static int do_one_ref(const char *base, each_ref_fn fn, int trim, |
345 | void *cb_data, struct ref_list *entry) | |
346 | { | |
347 | if (strncmp(base, entry->name, trim)) | |
348 | return 0; | |
349 | if (is_null_sha1(entry->sha1)) | |
350 | return 0; | |
cf0adba7 JH |
351 | if (entry->flag & REF_ISPEELED) |
352 | return 0; | |
ef06b918 JH |
353 | if (!has_sha1_file(entry->sha1)) { |
354 | error("%s does not point to a valid object!", entry->name); | |
355 | return 0; | |
356 | } | |
357 | return fn(entry->name + trim, entry->sha1, entry->flag, cb_data); | |
358 | } | |
359 | ||
cf0adba7 JH |
360 | int peel_ref(const char *ref, unsigned char *sha1) |
361 | { | |
362 | int flag; | |
363 | unsigned char base[20]; | |
364 | struct object *o; | |
365 | ||
366 | if (!resolve_ref(ref, base, 1, &flag)) | |
367 | return -1; | |
368 | ||
369 | if ((flag & REF_ISPACKED)) { | |
370 | struct ref_list *list = get_packed_refs(); | |
371 | int len = strlen(ref); | |
372 | ||
373 | while (list) { | |
374 | if ((list->flag & REF_ISPEELED) && | |
375 | !strncmp(list->name, ref, len) && | |
376 | strlen(list->name) == len + 3 && | |
377 | !strcmp(list->name + len, "^{}")) { | |
378 | hashcpy(sha1, list->sha1); | |
379 | return 0; | |
380 | } | |
381 | list = list->next; | |
382 | } | |
383 | /* older pack-refs did not leave peeled ones in */ | |
384 | } | |
385 | ||
386 | /* otherwise ... */ | |
387 | o = parse_object(base); | |
388 | if (o->type == OBJ_TAG) { | |
389 | o = deref_tag(o, ref, 0); | |
390 | if (o) { | |
391 | hashcpy(sha1, o->sha1); | |
392 | return 0; | |
393 | } | |
394 | } | |
395 | return -1; | |
396 | } | |
397 | ||
8da19775 JH |
398 | static int do_for_each_ref(const char *base, each_ref_fn fn, int trim, |
399 | void *cb_data) | |
8a65ff76 | 400 | { |
e1e22e37 LT |
401 | int retval; |
402 | struct ref_list *packed = get_packed_refs(); | |
403 | struct ref_list *loose = get_loose_refs(); | |
8a65ff76 | 404 | |
e1e22e37 LT |
405 | while (packed && loose) { |
406 | struct ref_list *entry; | |
407 | int cmp = strcmp(packed->name, loose->name); | |
408 | if (!cmp) { | |
409 | packed = packed->next; | |
410 | continue; | |
6cada6a9 | 411 | } |
e1e22e37 LT |
412 | if (cmp > 0) { |
413 | entry = loose; | |
414 | loose = loose->next; | |
415 | } else { | |
416 | entry = packed; | |
417 | packed = packed->next; | |
418 | } | |
ef06b918 | 419 | retval = do_one_ref(base, fn, trim, cb_data, entry); |
e1e22e37 LT |
420 | if (retval) |
421 | return retval; | |
422 | } | |
8a65ff76 | 423 | |
ef06b918 JH |
424 | for (packed = packed ? packed : loose; packed; packed = packed->next) { |
425 | retval = do_one_ref(base, fn, trim, cb_data, packed); | |
426 | if (retval) | |
427 | return retval; | |
8a65ff76 | 428 | } |
e1e22e37 | 429 | return 0; |
8a65ff76 LT |
430 | } |
431 | ||
cb5d709f | 432 | int head_ref(each_ref_fn fn, void *cb_data) |
723c31fe LT |
433 | { |
434 | unsigned char sha1[20]; | |
8da19775 JH |
435 | int flag; |
436 | ||
437 | if (resolve_ref("HEAD", sha1, 1, &flag)) | |
438 | return fn("HEAD", sha1, flag, cb_data); | |
2f34ba32 | 439 | return 0; |
723c31fe LT |
440 | } |
441 | ||
cb5d709f | 442 | int for_each_ref(each_ref_fn fn, void *cb_data) |
8a65ff76 | 443 | { |
cb5d709f | 444 | return do_for_each_ref("refs/", fn, 0, cb_data); |
a62be77f SE |
445 | } |
446 | ||
cb5d709f | 447 | int for_each_tag_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 448 | { |
cb5d709f | 449 | return do_for_each_ref("refs/tags/", fn, 10, cb_data); |
a62be77f SE |
450 | } |
451 | ||
cb5d709f | 452 | int for_each_branch_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 453 | { |
cb5d709f | 454 | return do_for_each_ref("refs/heads/", fn, 11, cb_data); |
a62be77f SE |
455 | } |
456 | ||
cb5d709f | 457 | int for_each_remote_ref(each_ref_fn fn, void *cb_data) |
a62be77f | 458 | { |
cb5d709f | 459 | return do_for_each_ref("refs/remotes/", fn, 13, cb_data); |
8a65ff76 LT |
460 | } |
461 | ||
cb5d709f JH |
462 | /* NEEDSWORK: This is only used by ssh-upload and it should go; the |
463 | * caller should do resolve_ref or read_ref like everybody else. Or | |
464 | * maybe everybody else should use get_ref_sha1() instead of doing | |
465 | * read_ref(). | |
466 | */ | |
95fc7512 DB |
467 | int get_ref_sha1(const char *ref, unsigned char *sha1) |
468 | { | |
95fc7512 DB |
469 | if (check_ref_format(ref)) |
470 | return -1; | |
ed378ec7 | 471 | return read_ref(mkpath("refs/%s", ref), sha1); |
95fc7512 DB |
472 | } |
473 | ||
03feddd6 JH |
474 | /* |
475 | * Make sure "ref" is something reasonable to have under ".git/refs/"; | |
476 | * We do not like it if: | |
477 | * | |
478 | * - any path component of it begins with ".", or | |
479 | * - it has double dots "..", or | |
480 | * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or | |
481 | * - it ends with a "/". | |
482 | */ | |
483 | ||
484 | static inline int bad_ref_char(int ch) | |
485 | { | |
486 | return (((unsigned) ch) <= ' ' || | |
68283999 JH |
487 | ch == '~' || ch == '^' || ch == ':' || |
488 | /* 2.13 Pattern Matching Notation */ | |
489 | ch == '?' || ch == '*' || ch == '['); | |
03feddd6 JH |
490 | } |
491 | ||
95fc7512 DB |
492 | int check_ref_format(const char *ref) |
493 | { | |
03feddd6 JH |
494 | int ch, level; |
495 | const char *cp = ref; | |
496 | ||
497 | level = 0; | |
498 | while (1) { | |
499 | while ((ch = *cp++) == '/') | |
500 | ; /* tolerate duplicated slashes */ | |
501 | if (!ch) | |
502 | return -1; /* should not end with slashes */ | |
503 | ||
504 | /* we are at the beginning of the path component */ | |
505 | if (ch == '.' || bad_ref_char(ch)) | |
506 | return -1; | |
507 | ||
508 | /* scan the rest of the path component */ | |
509 | while ((ch = *cp++) != 0) { | |
510 | if (bad_ref_char(ch)) | |
511 | return -1; | |
512 | if (ch == '/') | |
513 | break; | |
514 | if (ch == '.' && *cp == '.') | |
515 | return -1; | |
516 | } | |
517 | level++; | |
518 | if (!ch) { | |
519 | if (level < 2) | |
520 | return -1; /* at least of form "heads/blah" */ | |
521 | return 0; | |
522 | } | |
523 | } | |
95fc7512 DB |
524 | } |
525 | ||
e5f38ec3 | 526 | static struct ref_lock *verify_lock(struct ref_lock *lock, |
4bd18c43 SP |
527 | const unsigned char *old_sha1, int mustexist) |
528 | { | |
8da19775 | 529 | if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) { |
434cd0cd | 530 | error("Can't verify ref %s", lock->ref_name); |
4bd18c43 SP |
531 | unlock_ref(lock); |
532 | return NULL; | |
533 | } | |
a89fccd2 | 534 | if (hashcmp(lock->old_sha1, old_sha1)) { |
434cd0cd | 535 | error("Ref %s is at %s but expected %s", lock->ref_name, |
4bd18c43 SP |
536 | sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1)); |
537 | unlock_ref(lock); | |
538 | return NULL; | |
539 | } | |
540 | return lock; | |
541 | } | |
542 | ||
bc7127ef JH |
543 | static int remove_empty_dir_recursive(char *path, int len) |
544 | { | |
545 | DIR *dir = opendir(path); | |
546 | struct dirent *e; | |
547 | int ret = 0; | |
548 | ||
549 | if (!dir) | |
550 | return -1; | |
551 | if (path[len-1] != '/') | |
552 | path[len++] = '/'; | |
553 | while ((e = readdir(dir)) != NULL) { | |
554 | struct stat st; | |
555 | int namlen; | |
556 | if ((e->d_name[0] == '.') && | |
557 | ((e->d_name[1] == 0) || | |
558 | ((e->d_name[1] == '.') && e->d_name[2] == 0))) | |
559 | continue; /* "." and ".." */ | |
560 | ||
561 | namlen = strlen(e->d_name); | |
562 | if ((len + namlen < PATH_MAX) && | |
563 | strcpy(path + len, e->d_name) && | |
564 | !lstat(path, &st) && | |
565 | S_ISDIR(st.st_mode) && | |
28bed6ea | 566 | !remove_empty_dir_recursive(path, len + namlen)) |
bc7127ef JH |
567 | continue; /* happy */ |
568 | ||
569 | /* path too long, stat fails, or non-directory still exists */ | |
570 | ret = -1; | |
571 | break; | |
572 | } | |
573 | closedir(dir); | |
574 | if (!ret) { | |
575 | path[len] = 0; | |
576 | ret = rmdir(path); | |
577 | } | |
578 | return ret; | |
579 | } | |
580 | ||
581 | static int remove_empty_directories(char *file) | |
582 | { | |
583 | /* we want to create a file but there is a directory there; | |
584 | * if that is an empty directory (or a directory that contains | |
585 | * only empty directories), remove them. | |
586 | */ | |
587 | char path[PATH_MAX]; | |
588 | int len = strlen(file); | |
589 | ||
590 | if (len >= PATH_MAX) /* path too long ;-) */ | |
591 | return -1; | |
592 | strcpy(path, file); | |
593 | return remove_empty_dir_recursive(path, len); | |
594 | } | |
595 | ||
c0277d15 | 596 | static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int *flag) |
4bd18c43 | 597 | { |
434cd0cd | 598 | char *ref_file; |
ed378ec7 | 599 | const char *orig_ref = ref; |
4bd18c43 | 600 | struct ref_lock *lock; |
732232a1 | 601 | struct stat st; |
5cc3cef9 | 602 | int last_errno = 0; |
4431fcc4 | 603 | int mustexist = (old_sha1 && !is_null_sha1(old_sha1)); |
4bd18c43 SP |
604 | |
605 | lock = xcalloc(1, sizeof(struct ref_lock)); | |
606 | lock->lock_fd = -1; | |
607 | ||
c0277d15 | 608 | ref = resolve_ref(ref, lock->old_sha1, mustexist, flag); |
bc7127ef JH |
609 | if (!ref && errno == EISDIR) { |
610 | /* we are trying to lock foo but we used to | |
611 | * have foo/bar which now does not exist; | |
612 | * it is normal for the empty directory 'foo' | |
613 | * to remain. | |
614 | */ | |
615 | ref_file = git_path("%s", orig_ref); | |
5cc3cef9 JH |
616 | if (remove_empty_directories(ref_file)) { |
617 | last_errno = errno; | |
618 | error("there are still refs under '%s'", orig_ref); | |
619 | goto error_return; | |
620 | } | |
c0277d15 | 621 | ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, flag); |
bc7127ef | 622 | } |
ed378ec7 | 623 | if (!ref) { |
5cc3cef9 | 624 | last_errno = errno; |
818f477c | 625 | error("unable to resolve reference %s: %s", |
ed378ec7 | 626 | orig_ref, strerror(errno)); |
5cc3cef9 | 627 | goto error_return; |
4bd18c43 | 628 | } |
22a3844e JH |
629 | if (is_null_sha1(lock->old_sha1)) { |
630 | /* The ref did not exist and we are creating it. | |
631 | * Make sure there is no existing ref that is packed | |
632 | * whose name begins with our refname, nor a ref whose | |
633 | * name is a proper prefix of our refname. | |
634 | */ | |
635 | int namlen = strlen(ref); /* e.g. 'foo/bar' */ | |
636 | struct ref_list *list = get_packed_refs(); | |
637 | while (list) { | |
638 | /* list->name could be 'foo' or 'foo/bar/baz' */ | |
639 | int len = strlen(list->name); | |
640 | int cmplen = (namlen < len) ? namlen : len; | |
641 | const char *lead = (namlen < len) ? list->name : ref; | |
642 | ||
643 | if (!strncmp(ref, list->name, cmplen) && | |
644 | lead[cmplen] == '/') { | |
645 | error("'%s' exists; cannot create '%s'", | |
646 | list->name, ref); | |
647 | goto error_return; | |
648 | } | |
649 | list = list->next; | |
650 | } | |
651 | } | |
652 | ||
c33d5174 | 653 | lock->lk = xcalloc(1, sizeof(struct lock_file)); |
4bd18c43 | 654 | |
434cd0cd | 655 | lock->ref_name = xstrdup(ref); |
ed378ec7 | 656 | lock->log_file = xstrdup(git_path("logs/%s", ref)); |
7c1a278d | 657 | ref_file = git_path("%s", ref); |
434cd0cd | 658 | lock->force_write = lstat(ref_file, &st) && errno == ENOENT; |
4bd18c43 | 659 | |
5cc3cef9 JH |
660 | if (safe_create_leading_directories(ref_file)) { |
661 | last_errno = errno; | |
662 | error("unable to create directory for %s", ref_file); | |
663 | goto error_return; | |
664 | } | |
434cd0cd | 665 | lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, 1); |
4bd18c43 SP |
666 | |
667 | return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock; | |
5cc3cef9 JH |
668 | |
669 | error_return: | |
670 | unlock_ref(lock); | |
671 | errno = last_errno; | |
672 | return NULL; | |
4bd18c43 SP |
673 | } |
674 | ||
4431fcc4 | 675 | struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1) |
95fc7512 | 676 | { |
53cce84c | 677 | char refpath[PATH_MAX]; |
95fc7512 | 678 | if (check_ref_format(ref)) |
4bd18c43 | 679 | return NULL; |
53cce84c | 680 | strcpy(refpath, mkpath("refs/%s", ref)); |
c0277d15 | 681 | return lock_ref_sha1_basic(refpath, old_sha1, NULL); |
4bd18c43 SP |
682 | } |
683 | ||
4431fcc4 | 684 | struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1) |
4bd18c43 | 685 | { |
c0277d15 JH |
686 | return lock_ref_sha1_basic(ref, old_sha1, NULL); |
687 | } | |
688 | ||
26a063a1 JH |
689 | static struct lock_file packlock; |
690 | ||
c0277d15 JH |
691 | static int repack_without_ref(const char *refname) |
692 | { | |
693 | struct ref_list *list, *packed_ref_list; | |
694 | int fd; | |
695 | int found = 0; | |
c0277d15 JH |
696 | |
697 | packed_ref_list = get_packed_refs(); | |
698 | for (list = packed_ref_list; list; list = list->next) { | |
699 | if (!strcmp(refname, list->name)) { | |
700 | found = 1; | |
701 | break; | |
702 | } | |
703 | } | |
704 | if (!found) | |
705 | return 0; | |
706 | memset(&packlock, 0, sizeof(packlock)); | |
707 | fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0); | |
708 | if (fd < 0) | |
709 | return error("cannot delete '%s' from packed refs", refname); | |
710 | ||
711 | for (list = packed_ref_list; list; list = list->next) { | |
712 | char line[PATH_MAX + 100]; | |
713 | int len; | |
714 | ||
715 | if (!strcmp(refname, list->name)) | |
716 | continue; | |
717 | len = snprintf(line, sizeof(line), "%s %s\n", | |
718 | sha1_to_hex(list->sha1), list->name); | |
719 | /* this should not happen but just being defensive */ | |
720 | if (len > sizeof(line)) | |
721 | die("too long a refname '%s'", list->name); | |
722 | write_or_die(fd, line, len); | |
723 | } | |
724 | return commit_lock_file(&packlock); | |
725 | } | |
726 | ||
727 | int delete_ref(const char *refname, unsigned char *sha1) | |
728 | { | |
729 | struct ref_lock *lock; | |
730 | int err, i, ret = 0, flag = 0; | |
731 | ||
732 | lock = lock_ref_sha1_basic(refname, sha1, &flag); | |
733 | if (!lock) | |
734 | return 1; | |
735 | if (!(flag & REF_ISPACKED)) { | |
736 | /* loose */ | |
737 | i = strlen(lock->lk->filename) - 5; /* .lock */ | |
738 | lock->lk->filename[i] = 0; | |
739 | err = unlink(lock->lk->filename); | |
740 | if (err) { | |
741 | ret = 1; | |
742 | error("unlink(%s) failed: %s", | |
743 | lock->lk->filename, strerror(errno)); | |
744 | } | |
745 | lock->lk->filename[i] = '.'; | |
746 | } | |
747 | /* removing the loose one could have resurrected an earlier | |
748 | * packed one. Also, if it was not loose we need to repack | |
749 | * without it. | |
750 | */ | |
751 | ret |= repack_without_ref(refname); | |
752 | ||
753 | err = unlink(lock->log_file); | |
754 | if (err && errno != ENOENT) | |
755 | fprintf(stderr, "warning: unlink(%s) failed: %s", | |
756 | lock->log_file, strerror(errno)); | |
757 | invalidate_cached_refs(); | |
758 | unlock_ref(lock); | |
759 | return ret; | |
4bd18c43 SP |
760 | } |
761 | ||
e5f38ec3 | 762 | void unlock_ref(struct ref_lock *lock) |
4bd18c43 SP |
763 | { |
764 | if (lock->lock_fd >= 0) { | |
765 | close(lock->lock_fd); | |
c33d5174 JH |
766 | /* Do not free lock->lk -- atexit() still looks at them */ |
767 | if (lock->lk) | |
768 | rollback_lock_file(lock->lk); | |
4bd18c43 | 769 | } |
434cd0cd | 770 | free(lock->ref_name); |
4cac42b1 | 771 | free(lock->log_file); |
4bd18c43 SP |
772 | free(lock); |
773 | } | |
774 | ||
6de08ae6 SP |
775 | static int log_ref_write(struct ref_lock *lock, |
776 | const unsigned char *sha1, const char *msg) | |
777 | { | |
778 | int logfd, written, oflags = O_APPEND | O_WRONLY; | |
779 | unsigned maxlen, len; | |
780 | char *logrec; | |
ff4c8485 | 781 | const char *committer; |
6de08ae6 | 782 | |
4057deb5 JH |
783 | if (log_all_ref_updates && |
784 | !strncmp(lock->ref_name, "refs/heads/", 11)) { | |
6de08ae6 SP |
785 | if (safe_create_leading_directories(lock->log_file) < 0) |
786 | return error("unable to create directory for %s", | |
787 | lock->log_file); | |
788 | oflags |= O_CREAT; | |
789 | } | |
790 | ||
791 | logfd = open(lock->log_file, oflags, 0666); | |
792 | if (logfd < 0) { | |
1974bf62 | 793 | if (!(oflags & O_CREAT) && errno == ENOENT) |
6de08ae6 | 794 | return 0; |
3b463c3f JH |
795 | |
796 | if ((oflags & O_CREAT) && errno == EISDIR) { | |
797 | if (remove_empty_directories(lock->log_file)) { | |
798 | return error("There are still logs under '%s'", | |
799 | lock->log_file); | |
800 | } | |
801 | logfd = open(lock->log_file, oflags, 0666); | |
802 | } | |
803 | ||
804 | if (logfd < 0) | |
805 | return error("Unable to append to %s: %s", | |
806 | lock->log_file, strerror(errno)); | |
6de08ae6 SP |
807 | } |
808 | ||
ff4c8485 | 809 | committer = git_committer_info(1); |
6de08ae6 | 810 | if (msg) { |
ff4c8485 | 811 | maxlen = strlen(committer) + strlen(msg) + 2*40 + 5; |
6de08ae6 SP |
812 | logrec = xmalloc(maxlen); |
813 | len = snprintf(logrec, maxlen, "%s %s %s\t%s\n", | |
814 | sha1_to_hex(lock->old_sha1), | |
815 | sha1_to_hex(sha1), | |
ff4c8485 | 816 | committer, |
6de08ae6 | 817 | msg); |
e5f38ec3 JH |
818 | } |
819 | else { | |
ff4c8485 | 820 | maxlen = strlen(committer) + 2*40 + 4; |
6de08ae6 SP |
821 | logrec = xmalloc(maxlen); |
822 | len = snprintf(logrec, maxlen, "%s %s %s\n", | |
823 | sha1_to_hex(lock->old_sha1), | |
824 | sha1_to_hex(sha1), | |
ff4c8485 | 825 | committer); |
6de08ae6 SP |
826 | } |
827 | written = len <= maxlen ? write(logfd, logrec, len) : -1; | |
828 | free(logrec); | |
829 | close(logfd); | |
830 | if (written != len) | |
831 | return error("Unable to append to %s", lock->log_file); | |
832 | return 0; | |
833 | } | |
834 | ||
4bd18c43 SP |
835 | int write_ref_sha1(struct ref_lock *lock, |
836 | const unsigned char *sha1, const char *logmsg) | |
837 | { | |
838 | static char term = '\n'; | |
839 | ||
840 | if (!lock) | |
95fc7512 | 841 | return -1; |
a89fccd2 | 842 | if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) { |
4bd18c43 SP |
843 | unlock_ref(lock); |
844 | return 0; | |
95fc7512 | 845 | } |
4bd18c43 SP |
846 | if (write(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 || |
847 | write(lock->lock_fd, &term, 1) != 1 | |
848 | || close(lock->lock_fd) < 0) { | |
c33d5174 | 849 | error("Couldn't write %s", lock->lk->filename); |
4bd18c43 SP |
850 | unlock_ref(lock); |
851 | return -1; | |
852 | } | |
5e290ff7 | 853 | invalidate_cached_refs(); |
6de08ae6 SP |
854 | if (log_ref_write(lock, sha1, logmsg) < 0) { |
855 | unlock_ref(lock); | |
856 | return -1; | |
857 | } | |
c33d5174 | 858 | if (commit_lock_file(lock->lk)) { |
434cd0cd | 859 | error("Couldn't set %s", lock->ref_name); |
4bd18c43 SP |
860 | unlock_ref(lock); |
861 | return -1; | |
862 | } | |
863 | lock->lock_fd = -1; | |
864 | unlock_ref(lock); | |
865 | return 0; | |
95fc7512 | 866 | } |
d556fae2 | 867 | |
ab2a1a32 | 868 | int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *sha1) |
d556fae2 | 869 | { |
e5229042 | 870 | const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec; |
d556fae2 SP |
871 | char *tz_c; |
872 | int logfd, tz; | |
873 | struct stat st; | |
874 | unsigned long date; | |
e5229042 | 875 | unsigned char logged_sha1[20]; |
d556fae2 SP |
876 | |
877 | logfile = git_path("logs/%s", ref); | |
878 | logfd = open(logfile, O_RDONLY, 0); | |
879 | if (logfd < 0) | |
880 | die("Unable to read log %s: %s", logfile, strerror(errno)); | |
881 | fstat(logfd, &st); | |
882 | if (!st.st_size) | |
883 | die("Log %s is empty.", logfile); | |
884 | logdata = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, logfd, 0); | |
885 | close(logfd); | |
886 | ||
e5229042 | 887 | lastrec = NULL; |
d556fae2 SP |
888 | rec = logend = logdata + st.st_size; |
889 | while (logdata < rec) { | |
890 | if (logdata < rec && *(rec-1) == '\n') | |
891 | rec--; | |
e5229042 SP |
892 | lastgt = NULL; |
893 | while (logdata < rec && *(rec-1) != '\n') { | |
d556fae2 | 894 | rec--; |
e5229042 SP |
895 | if (*rec == '>') |
896 | lastgt = rec; | |
897 | } | |
898 | if (!lastgt) | |
d556fae2 | 899 | die("Log %s is corrupt.", logfile); |
e5229042 | 900 | date = strtoul(lastgt + 1, &tz_c, 10); |
ab2a1a32 | 901 | if (date <= at_time || cnt == 0) { |
e5229042 SP |
902 | if (lastrec) { |
903 | if (get_sha1_hex(lastrec, logged_sha1)) | |
904 | die("Log %s is corrupt.", logfile); | |
905 | if (get_sha1_hex(rec + 41, sha1)) | |
906 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 907 | if (hashcmp(logged_sha1, sha1)) { |
e5229042 SP |
908 | tz = strtoul(tz_c, NULL, 10); |
909 | fprintf(stderr, | |
910 | "warning: Log %s has gap after %s.\n", | |
911 | logfile, show_rfc2822_date(date, tz)); | |
912 | } | |
e5f38ec3 JH |
913 | } |
914 | else if (date == at_time) { | |
e5229042 SP |
915 | if (get_sha1_hex(rec + 41, sha1)) |
916 | die("Log %s is corrupt.", logfile); | |
e5f38ec3 JH |
917 | } |
918 | else { | |
e5229042 SP |
919 | if (get_sha1_hex(rec + 41, logged_sha1)) |
920 | die("Log %s is corrupt.", logfile); | |
a89fccd2 | 921 | if (hashcmp(logged_sha1, sha1)) { |
e5229042 SP |
922 | tz = strtoul(tz_c, NULL, 10); |
923 | fprintf(stderr, | |
924 | "warning: Log %s unexpectedly ended on %s.\n", | |
925 | logfile, show_rfc2822_date(date, tz)); | |
926 | } | |
927 | } | |
d556fae2 SP |
928 | munmap((void*)logdata, st.st_size); |
929 | return 0; | |
930 | } | |
e5229042 | 931 | lastrec = rec; |
ab2a1a32 JH |
932 | if (cnt > 0) |
933 | cnt--; | |
d556fae2 SP |
934 | } |
935 | ||
e5229042 SP |
936 | rec = logdata; |
937 | while (rec < logend && *rec != '>' && *rec != '\n') | |
938 | rec++; | |
939 | if (rec == logend || *rec == '\n') | |
d556fae2 | 940 | die("Log %s is corrupt.", logfile); |
e5229042 | 941 | date = strtoul(rec + 1, &tz_c, 10); |
d556fae2 SP |
942 | tz = strtoul(tz_c, NULL, 10); |
943 | if (get_sha1_hex(logdata, sha1)) | |
944 | die("Log %s is corrupt.", logfile); | |
945 | munmap((void*)logdata, st.st_size); | |
946 | fprintf(stderr, "warning: Log %s only goes back to %s.\n", | |
947 | logfile, show_rfc2822_date(date, tz)); | |
948 | return 0; | |
949 | } |