Add platform-independent .git "symlink"
[git/git.git] / refs.c
CommitLineData
95fc7512 1#include "cache.h"
85023577 2#include "refs.h"
cf0adba7
JH
3#include "object.h"
4#include "tag.h"
7155b727 5#include "dir.h"
95fc7512 6
f4204ab9
JH
7/* ISSYMREF=01 and ISPACKED=02 are public interfaces */
8#define REF_KNOWS_PEELED 04
9
e1e22e37
LT
10struct ref_list {
11 struct ref_list *next;
f4204ab9 12 unsigned char flag; /* ISSYMREF? ISPACKED? */
e1e22e37 13 unsigned char sha1[20];
f4204ab9 14 unsigned char peeled[20];
e1e22e37
LT
15 char name[FLEX_ARRAY];
16};
17
f4204ab9 18static const char *parse_ref_line(char *line, unsigned char *sha1)
e1e22e37
LT
19{
20 /*
21 * 42: the answer to everything.
22 *
23 * In this case, it happens to be the answer to
24 * 40 (length of sha1 hex representation)
25 * +1 (space in between hex and name)
26 * +1 (newline at the end of the line)
27 */
28 int len = strlen(line) - 42;
29
30 if (len <= 0)
31 return NULL;
32 if (get_sha1_hex(line, sha1) < 0)
33 return NULL;
34 if (!isspace(line[40]))
35 return NULL;
36 line += 41;
f4204ab9
JH
37 if (isspace(*line))
38 return NULL;
e1e22e37
LT
39 if (line[len] != '\n')
40 return NULL;
41 line[len] = 0;
cf0adba7 42
e1e22e37
LT
43 return line;
44}
45
8da19775 46static struct ref_list *add_ref(const char *name, const unsigned char *sha1,
f4204ab9
JH
47 int flag, struct ref_list *list,
48 struct ref_list **new_entry)
e1e22e37
LT
49{
50 int len;
c774aab9 51 struct ref_list *entry;
e1e22e37
LT
52
53 /* Allocate it and add it in.. */
54 len = strlen(name) + 1;
55 entry = xmalloc(sizeof(struct ref_list) + len);
56 hashcpy(entry->sha1, sha1);
f4204ab9 57 hashclr(entry->peeled);
e1e22e37 58 memcpy(entry->name, name, len);
8da19775 59 entry->flag = flag;
c774aab9 60 entry->next = list;
f4204ab9
JH
61 if (new_entry)
62 *new_entry = entry;
c774aab9
JP
63 return entry;
64}
65
66/* merge sort the ref list */
67static struct ref_list *sort_ref_list(struct ref_list *list)
68{
69 int psize, qsize, last_merge_count, cmp;
70 struct ref_list *p, *q, *l, *e;
71 struct ref_list *new_list = list;
72 int k = 1;
73 int merge_count = 0;
74
75 if (!list)
76 return list;
77
78 do {
79 last_merge_count = merge_count;
80 merge_count = 0;
81
82 psize = 0;
83
84 p = new_list;
85 q = new_list;
86 new_list = NULL;
87 l = NULL;
88
89 while (p) {
90 merge_count++;
91
92 while (psize < k && q->next) {
93 q = q->next;
94 psize++;
95 }
96 qsize = k;
97
98 while ((psize > 0) || (qsize > 0 && q)) {
99 if (qsize == 0 || !q) {
100 e = p;
101 p = p->next;
102 psize--;
103 } else if (psize == 0) {
104 e = q;
105 q = q->next;
106 qsize--;
107 } else {
108 cmp = strcmp(q->name, p->name);
109 if (cmp < 0) {
110 e = q;
111 q = q->next;
112 qsize--;
113 } else if (cmp > 0) {
114 e = p;
115 p = p->next;
116 psize--;
117 } else {
118 if (hashcmp(q->sha1, p->sha1))
119 die("Duplicated ref, and SHA1s don't match: %s",
120 q->name);
121 warning("Duplicated ref: %s", q->name);
122 e = q;
123 q = q->next;
124 qsize--;
125 free(e);
126 e = p;
127 p = p->next;
128 psize--;
129 }
130 }
131
132 e->next = NULL;
133
134 if (l)
135 l->next = e;
136 if (!new_list)
137 new_list = e;
138 l = e;
139 }
140
141 p = q;
142 };
143
144 k = k * 2;
145 } while ((last_merge_count != merge_count) || (last_merge_count != 1));
146
147 return new_list;
e1e22e37
LT
148}
149
5e290ff7
JH
150/*
151 * Future: need to be in "struct repository"
152 * when doing a full libification.
153 */
4175e9e3 154static struct cached_refs {
5e290ff7
JH
155 char did_loose;
156 char did_packed;
157 struct ref_list *loose;
158 struct ref_list *packed;
159} cached_refs;
0ae91be0 160static struct ref_list *current_ref;
5e290ff7
JH
161
162static void free_ref_list(struct ref_list *list)
163{
164 struct ref_list *next;
165 for ( ; list; list = next) {
166 next = list->next;
167 free(list);
168 }
169}
170
171static void invalidate_cached_refs(void)
e1e22e37 172{
5e290ff7
JH
173 struct cached_refs *ca = &cached_refs;
174
175 if (ca->did_loose && ca->loose)
176 free_ref_list(ca->loose);
177 if (ca->did_packed && ca->packed)
178 free_ref_list(ca->packed);
179 ca->loose = ca->packed = NULL;
180 ca->did_loose = ca->did_packed = 0;
181}
e1e22e37 182
f4204ab9
JH
183static void read_packed_refs(FILE *f, struct cached_refs *cached_refs)
184{
185 struct ref_list *list = NULL;
186 struct ref_list *last = NULL;
187 char refline[PATH_MAX];
188 int flag = REF_ISPACKED;
189
190 while (fgets(refline, sizeof(refline), f)) {
191 unsigned char sha1[20];
192 const char *name;
193 static const char header[] = "# pack-refs with:";
194
195 if (!strncmp(refline, header, sizeof(header)-1)) {
196 const char *traits = refline + sizeof(header) - 1;
197 if (strstr(traits, " peeled "))
198 flag |= REF_KNOWS_PEELED;
199 /* perhaps other traits later as well */
200 continue;
201 }
202
203 name = parse_ref_line(refline, sha1);
204 if (name) {
205 list = add_ref(name, sha1, flag, list, &last);
206 continue;
207 }
208 if (last &&
209 refline[0] == '^' &&
210 strlen(refline) == 42 &&
211 refline[41] == '\n' &&
212 !get_sha1_hex(refline + 1, sha1))
213 hashcpy(last->peeled, sha1);
214 }
c774aab9 215 cached_refs->packed = sort_ref_list(list);
f4204ab9
JH
216}
217
5e290ff7
JH
218static struct ref_list *get_packed_refs(void)
219{
220 if (!cached_refs.did_packed) {
e1e22e37 221 FILE *f = fopen(git_path("packed-refs"), "r");
f4204ab9 222 cached_refs.packed = NULL;
e1e22e37 223 if (f) {
f4204ab9 224 read_packed_refs(f, &cached_refs);
e1e22e37 225 fclose(f);
e1e22e37 226 }
5e290ff7 227 cached_refs.did_packed = 1;
e1e22e37 228 }
5e290ff7 229 return cached_refs.packed;
e1e22e37
LT
230}
231
232static struct ref_list *get_ref_dir(const char *base, struct ref_list *list)
233{
234 DIR *dir = opendir(git_path("%s", base));
235
236 if (dir) {
237 struct dirent *de;
238 int baselen = strlen(base);
ed378ec7 239 char *ref = xmalloc(baselen + 257);
e1e22e37 240
ed378ec7 241 memcpy(ref, base, baselen);
e1e22e37 242 if (baselen && base[baselen-1] != '/')
ed378ec7 243 ref[baselen++] = '/';
e1e22e37
LT
244
245 while ((de = readdir(dir)) != NULL) {
246 unsigned char sha1[20];
247 struct stat st;
8da19775 248 int flag;
e1e22e37
LT
249 int namelen;
250
251 if (de->d_name[0] == '.')
252 continue;
253 namelen = strlen(de->d_name);
254 if (namelen > 255)
255 continue;
256 if (has_extension(de->d_name, ".lock"))
257 continue;
ed378ec7
LT
258 memcpy(ref + baselen, de->d_name, namelen+1);
259 if (stat(git_path("%s", ref), &st) < 0)
e1e22e37
LT
260 continue;
261 if (S_ISDIR(st.st_mode)) {
ed378ec7 262 list = get_ref_dir(ref, list);
e1e22e37
LT
263 continue;
264 }
8da19775 265 if (!resolve_ref(ref, sha1, 1, &flag)) {
ed378ec7 266 error("%s points nowhere!", ref);
e1e22e37
LT
267 continue;
268 }
f4204ab9 269 list = add_ref(ref, sha1, flag, list, NULL);
e1e22e37 270 }
ed378ec7 271 free(ref);
e1e22e37
LT
272 closedir(dir);
273 }
c774aab9 274 return sort_ref_list(list);
e1e22e37
LT
275}
276
277static struct ref_list *get_loose_refs(void)
278{
5e290ff7
JH
279 if (!cached_refs.did_loose) {
280 cached_refs.loose = get_ref_dir("refs", NULL);
281 cached_refs.did_loose = 1;
e1e22e37 282 }
5e290ff7 283 return cached_refs.loose;
e1e22e37
LT
284}
285
ca8db142
LT
286/* We allow "recursive" symbolic refs. Only within reason, though */
287#define MAXDEPTH 5
0ebde32c
LT
288#define MAXREFLEN (1024)
289
290static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result)
291{
292 FILE *f;
293 struct cached_refs refs;
294 struct ref_list *ref;
295 int retval;
296
297 strcpy(name + pathlen, "packed-refs");
298 f = fopen(name, "r");
299 if (!f)
300 return -1;
301 read_packed_refs(f, &refs);
302 fclose(f);
303 ref = refs.packed;
304 retval = -1;
305 while (ref) {
306 if (!strcmp(ref->name, refname)) {
307 retval = 0;
308 memcpy(result, ref->sha1, 20);
309 break;
310 }
311 ref = ref->next;
312 }
313 free_ref_list(refs.packed);
314 return retval;
315}
316
317static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion)
318{
319 int fd, len = strlen(refname);
320 char buffer[128], *p;
321
322 if (recursion > MAXDEPTH || len > MAXREFLEN)
323 return -1;
324 memcpy(name + pathlen, refname, len+1);
325 fd = open(name, O_RDONLY);
326 if (fd < 0)
327 return resolve_gitlink_packed_ref(name, pathlen, refname, result);
328
329 len = read(fd, buffer, sizeof(buffer)-1);
330 close(fd);
331 if (len < 0)
332 return -1;
333 while (len && isspace(buffer[len-1]))
334 len--;
335 buffer[len] = 0;
336
337 /* Was it a detached head or an old-fashioned symlink? */
338 if (!get_sha1_hex(buffer, result))
339 return 0;
340
341 /* Symref? */
342 if (strncmp(buffer, "ref:", 4))
343 return -1;
344 p = buffer + 4;
345 while (isspace(*p))
346 p++;
347
348 return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1);
349}
350
351int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result)
352{
353 int len = strlen(path), retval;
354 char *gitdir;
355
356 while (len && path[len-1] == '/')
357 len--;
358 if (!len)
359 return -1;
360 gitdir = xmalloc(len + MAXREFLEN + 8);
361 memcpy(gitdir, path, len);
362 memcpy(gitdir + len, "/.git/", 7);
363
364 retval = resolve_gitlink_ref_recursive(gitdir, len+6, refname, result, 0);
365 free(gitdir);
366 return retval;
367}
ca8db142 368
8da19775 369const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag)
8a65ff76 370{
a876ed83
JH
371 int depth = MAXDEPTH, len;
372 char buffer[256];
ed378ec7 373 static char ref_buffer[256];
ca8db142 374
8da19775
JH
375 if (flag)
376 *flag = 0;
377
a876ed83 378 for (;;) {
ed378ec7 379 const char *path = git_path("%s", ref);
a876ed83
JH
380 struct stat st;
381 char *buf;
382 int fd;
8a65ff76 383
a876ed83
JH
384 if (--depth < 0)
385 return NULL;
ca8db142 386
a876ed83
JH
387 /* Special case: non-existing file.
388 * Not having the refs/heads/new-branch is OK
389 * if we are writing into it, so is .git/HEAD
390 * that points at refs/heads/master still to be
391 * born. It is NOT OK if we are resolving for
392 * reading.
393 */
394 if (lstat(path, &st) < 0) {
434cd0cd
LT
395 struct ref_list *list = get_packed_refs();
396 while (list) {
f4204ab9 397 if (!strcmp(ref, list->name)) {
434cd0cd 398 hashcpy(sha1, list->sha1);
8da19775
JH
399 if (flag)
400 *flag |= REF_ISPACKED;
434cd0cd
LT
401 return ref;
402 }
403 list = list->next;
404 }
a876ed83
JH
405 if (reading || errno != ENOENT)
406 return NULL;
e702496e 407 hashclr(sha1);
ed378ec7 408 return ref;
a876ed83 409 }
ca8db142 410
a876ed83
JH
411 /* Follow "normalized" - ie "refs/.." symlinks by hand */
412 if (S_ISLNK(st.st_mode)) {
413 len = readlink(path, buffer, sizeof(buffer)-1);
414 if (len >= 5 && !memcmp("refs/", buffer, 5)) {
ed378ec7
LT
415 buffer[len] = 0;
416 strcpy(ref_buffer, buffer);
417 ref = ref_buffer;
8da19775
JH
418 if (flag)
419 *flag |= REF_ISSYMREF;
a876ed83
JH
420 continue;
421 }
ca8db142 422 }
a876ed83 423
7a21632f
DS
424 /* Is it a directory? */
425 if (S_ISDIR(st.st_mode)) {
426 errno = EISDIR;
427 return NULL;
428 }
429
a876ed83
JH
430 /*
431 * Anything else, just open it and try to use it as
432 * a ref
433 */
434 fd = open(path, O_RDONLY);
435 if (fd < 0)
436 return NULL;
93d26e4c 437 len = read_in_full(fd, buffer, sizeof(buffer)-1);
a876ed83
JH
438 close(fd);
439
440 /*
441 * Is it a symbolic ref?
442 */
443 if (len < 4 || memcmp("ref:", buffer, 4))
444 break;
445 buf = buffer + 4;
446 len -= 4;
447 while (len && isspace(*buf))
448 buf++, len--;
449 while (len && isspace(buf[len-1]))
ed378ec7
LT
450 len--;
451 buf[len] = 0;
452 memcpy(ref_buffer, buf, len + 1);
453 ref = ref_buffer;
8da19775
JH
454 if (flag)
455 *flag |= REF_ISSYMREF;
8a65ff76 456 }
a876ed83
JH
457 if (len < 40 || get_sha1_hex(buffer, sha1))
458 return NULL;
ed378ec7 459 return ref;
a876ed83
JH
460}
461
ed378ec7 462int read_ref(const char *ref, unsigned char *sha1)
a876ed83 463{
8da19775 464 if (resolve_ref(ref, sha1, 1, NULL))
a876ed83
JH
465 return 0;
466 return -1;
8a65ff76
LT
467}
468
ef06b918
JH
469static int do_one_ref(const char *base, each_ref_fn fn, int trim,
470 void *cb_data, struct ref_list *entry)
471{
472 if (strncmp(base, entry->name, trim))
473 return 0;
474 if (is_null_sha1(entry->sha1))
475 return 0;
476 if (!has_sha1_file(entry->sha1)) {
477 error("%s does not point to a valid object!", entry->name);
478 return 0;
479 }
0ae91be0 480 current_ref = entry;
ef06b918
JH
481 return fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
482}
483
cf0adba7
JH
484int peel_ref(const char *ref, unsigned char *sha1)
485{
486 int flag;
487 unsigned char base[20];
488 struct object *o;
489
0ae91be0
SP
490 if (current_ref && (current_ref->name == ref
491 || !strcmp(current_ref->name, ref))) {
492 if (current_ref->flag & REF_KNOWS_PEELED) {
493 hashcpy(sha1, current_ref->peeled);
494 return 0;
495 }
496 hashcpy(base, current_ref->sha1);
497 goto fallback;
498 }
499
cf0adba7
JH
500 if (!resolve_ref(ref, base, 1, &flag))
501 return -1;
502
503 if ((flag & REF_ISPACKED)) {
504 struct ref_list *list = get_packed_refs();
cf0adba7
JH
505
506 while (list) {
f4204ab9
JH
507 if (!strcmp(list->name, ref)) {
508 if (list->flag & REF_KNOWS_PEELED) {
509 hashcpy(sha1, list->peeled);
510 return 0;
511 }
512 /* older pack-refs did not leave peeled ones */
513 break;
cf0adba7
JH
514 }
515 list = list->next;
516 }
cf0adba7
JH
517 }
518
0ae91be0 519fallback:
cf0adba7 520 o = parse_object(base);
8c87dc77 521 if (o && o->type == OBJ_TAG) {
cf0adba7
JH
522 o = deref_tag(o, ref, 0);
523 if (o) {
524 hashcpy(sha1, o->sha1);
525 return 0;
526 }
527 }
528 return -1;
529}
530
8da19775
JH
531static int do_for_each_ref(const char *base, each_ref_fn fn, int trim,
532 void *cb_data)
8a65ff76 533{
0ae91be0 534 int retval = 0;
e1e22e37
LT
535 struct ref_list *packed = get_packed_refs();
536 struct ref_list *loose = get_loose_refs();
8a65ff76 537
e1e22e37
LT
538 while (packed && loose) {
539 struct ref_list *entry;
540 int cmp = strcmp(packed->name, loose->name);
541 if (!cmp) {
542 packed = packed->next;
543 continue;
6cada6a9 544 }
e1e22e37
LT
545 if (cmp > 0) {
546 entry = loose;
547 loose = loose->next;
548 } else {
549 entry = packed;
550 packed = packed->next;
551 }
ef06b918 552 retval = do_one_ref(base, fn, trim, cb_data, entry);
e1e22e37 553 if (retval)
0ae91be0 554 goto end_each;
e1e22e37 555 }
8a65ff76 556
ef06b918
JH
557 for (packed = packed ? packed : loose; packed; packed = packed->next) {
558 retval = do_one_ref(base, fn, trim, cb_data, packed);
559 if (retval)
0ae91be0 560 goto end_each;
8a65ff76 561 }
0ae91be0
SP
562
563end_each:
564 current_ref = NULL;
565 return retval;
8a65ff76
LT
566}
567
cb5d709f 568int head_ref(each_ref_fn fn, void *cb_data)
723c31fe
LT
569{
570 unsigned char sha1[20];
8da19775
JH
571 int flag;
572
573 if (resolve_ref("HEAD", sha1, 1, &flag))
574 return fn("HEAD", sha1, flag, cb_data);
2f34ba32 575 return 0;
723c31fe
LT
576}
577
cb5d709f 578int for_each_ref(each_ref_fn fn, void *cb_data)
8a65ff76 579{
cb5d709f 580 return do_for_each_ref("refs/", fn, 0, cb_data);
a62be77f
SE
581}
582
cb5d709f 583int for_each_tag_ref(each_ref_fn fn, void *cb_data)
a62be77f 584{
cb5d709f 585 return do_for_each_ref("refs/tags/", fn, 10, cb_data);
a62be77f
SE
586}
587
cb5d709f 588int for_each_branch_ref(each_ref_fn fn, void *cb_data)
a62be77f 589{
cb5d709f 590 return do_for_each_ref("refs/heads/", fn, 11, cb_data);
a62be77f
SE
591}
592
cb5d709f 593int for_each_remote_ref(each_ref_fn fn, void *cb_data)
a62be77f 594{
cb5d709f 595 return do_for_each_ref("refs/remotes/", fn, 13, cb_data);
8a65ff76
LT
596}
597
03feddd6
JH
598/*
599 * Make sure "ref" is something reasonable to have under ".git/refs/";
600 * We do not like it if:
601 *
602 * - any path component of it begins with ".", or
603 * - it has double dots "..", or
604 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
605 * - it ends with a "/".
606 */
607
608static inline int bad_ref_char(int ch)
609{
8558fd9e
DB
610 if (((unsigned) ch) <= ' ' ||
611 ch == '~' || ch == '^' || ch == ':')
612 return 1;
613 /* 2.13 Pattern Matching Notation */
614 if (ch == '?' || ch == '[') /* Unsupported */
615 return 1;
616 if (ch == '*') /* Supported at the end */
617 return 2;
618 return 0;
03feddd6
JH
619}
620
95fc7512
DB
621int check_ref_format(const char *ref)
622{
8558fd9e 623 int ch, level, bad_type;
03feddd6
JH
624 const char *cp = ref;
625
626 level = 0;
627 while (1) {
628 while ((ch = *cp++) == '/')
629 ; /* tolerate duplicated slashes */
630 if (!ch)
5f7b202a
JH
631 /* should not end with slashes */
632 return CHECK_REF_FORMAT_ERROR;
03feddd6
JH
633
634 /* we are at the beginning of the path component */
8558fd9e 635 if (ch == '.')
5f7b202a 636 return CHECK_REF_FORMAT_ERROR;
8558fd9e
DB
637 bad_type = bad_ref_char(ch);
638 if (bad_type) {
5f7b202a
JH
639 return (bad_type == 2 && !*cp)
640 ? CHECK_REF_FORMAT_WILDCARD
641 : CHECK_REF_FORMAT_ERROR;
8558fd9e 642 }
03feddd6
JH
643
644 /* scan the rest of the path component */
645 while ((ch = *cp++) != 0) {
8558fd9e
DB
646 bad_type = bad_ref_char(ch);
647 if (bad_type) {
5f7b202a
JH
648 return (bad_type == 2 && !*cp)
649 ? CHECK_REF_FORMAT_WILDCARD
650 : CHECK_REF_FORMAT_ERROR;
8558fd9e 651 }
03feddd6
JH
652 if (ch == '/')
653 break;
654 if (ch == '.' && *cp == '.')
5f7b202a 655 return CHECK_REF_FORMAT_ERROR;
03feddd6
JH
656 }
657 level++;
658 if (!ch) {
659 if (level < 2)
5f7b202a
JH
660 return CHECK_REF_FORMAT_ONELEVEL;
661 return CHECK_REF_FORMAT_OK;
03feddd6
JH
662 }
663 }
95fc7512
DB
664}
665
79803322
SP
666const char *ref_rev_parse_rules[] = {
667 "%.*s",
668 "refs/%.*s",
669 "refs/tags/%.*s",
670 "refs/heads/%.*s",
671 "refs/remotes/%.*s",
672 "refs/remotes/%.*s/HEAD",
673 NULL
674};
675
605b4978
SP
676const char *ref_fetch_rules[] = {
677 "%.*s",
678 "refs/%.*s",
679 "refs/heads/%.*s",
680 NULL
681};
682
79803322
SP
683int refname_match(const char *abbrev_name, const char *full_name, const char **rules)
684{
685 const char **p;
686 const int abbrev_name_len = strlen(abbrev_name);
687
688 for (p = rules; *p; p++) {
689 if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
690 return 1;
691 }
692 }
693
694 return 0;
695}
696
e5f38ec3 697static struct ref_lock *verify_lock(struct ref_lock *lock,
4bd18c43
SP
698 const unsigned char *old_sha1, int mustexist)
699{
8da19775 700 if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
434cd0cd 701 error("Can't verify ref %s", lock->ref_name);
4bd18c43
SP
702 unlock_ref(lock);
703 return NULL;
704 }
a89fccd2 705 if (hashcmp(lock->old_sha1, old_sha1)) {
434cd0cd 706 error("Ref %s is at %s but expected %s", lock->ref_name,
4bd18c43
SP
707 sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
708 unlock_ref(lock);
709 return NULL;
710 }
711 return lock;
712}
713
7155b727 714static int remove_empty_directories(const char *file)
bc7127ef
JH
715{
716 /* we want to create a file but there is a directory there;
717 * if that is an empty directory (or a directory that contains
718 * only empty directories), remove them.
719 */
7155b727
JS
720 struct strbuf path;
721 int result;
bc7127ef 722
7155b727
JS
723 strbuf_init(&path, 20);
724 strbuf_addstr(&path, file);
725
726 result = remove_dir_recursively(&path, 1);
727
728 strbuf_release(&path);
729
730 return result;
bc7127ef
JH
731}
732
c976d415
LH
733static int is_refname_available(const char *ref, const char *oldref,
734 struct ref_list *list, int quiet)
735{
736 int namlen = strlen(ref); /* e.g. 'foo/bar' */
737 while (list) {
738 /* list->name could be 'foo' or 'foo/bar/baz' */
739 if (!oldref || strcmp(oldref, list->name)) {
740 int len = strlen(list->name);
741 int cmplen = (namlen < len) ? namlen : len;
742 const char *lead = (namlen < len) ? list->name : ref;
743 if (!strncmp(ref, list->name, cmplen) &&
744 lead[cmplen] == '/') {
745 if (!quiet)
746 error("'%s' exists; cannot create '%s'",
747 list->name, ref);
748 return 0;
749 }
750 }
751 list = list->next;
752 }
753 return 1;
754}
755
68db31cc 756static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p)
4bd18c43 757{
434cd0cd 758 char *ref_file;
ed378ec7 759 const char *orig_ref = ref;
4bd18c43 760 struct ref_lock *lock;
732232a1 761 struct stat st;
5cc3cef9 762 int last_errno = 0;
68db31cc 763 int type;
4431fcc4 764 int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
4bd18c43
SP
765
766 lock = xcalloc(1, sizeof(struct ref_lock));
767 lock->lock_fd = -1;
768
68db31cc 769 ref = resolve_ref(ref, lock->old_sha1, mustexist, &type);
bc7127ef
JH
770 if (!ref && errno == EISDIR) {
771 /* we are trying to lock foo but we used to
772 * have foo/bar which now does not exist;
773 * it is normal for the empty directory 'foo'
774 * to remain.
775 */
776 ref_file = git_path("%s", orig_ref);
5cc3cef9
JH
777 if (remove_empty_directories(ref_file)) {
778 last_errno = errno;
779 error("there are still refs under '%s'", orig_ref);
780 goto error_return;
781 }
68db31cc 782 ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type);
bc7127ef 783 }
68db31cc
SV
784 if (type_p)
785 *type_p = type;
ed378ec7 786 if (!ref) {
5cc3cef9 787 last_errno = errno;
818f477c 788 error("unable to resolve reference %s: %s",
ed378ec7 789 orig_ref, strerror(errno));
5cc3cef9 790 goto error_return;
4bd18c43 791 }
c976d415
LH
792 /* When the ref did not exist and we are creating it,
793 * make sure there is no existing ref that is packed
794 * whose name begins with our refname, nor a ref whose
795 * name is a proper prefix of our refname.
796 */
797 if (is_null_sha1(lock->old_sha1) &&
798 !is_refname_available(ref, NULL, get_packed_refs(), 0))
799 goto error_return;
22a3844e 800
c33d5174 801 lock->lk = xcalloc(1, sizeof(struct lock_file));
4bd18c43 802
68db31cc
SV
803 if (flags & REF_NODEREF)
804 ref = orig_ref;
434cd0cd 805 lock->ref_name = xstrdup(ref);
1655707c 806 lock->orig_ref_name = xstrdup(orig_ref);
7c1a278d 807 ref_file = git_path("%s", ref);
68db31cc
SV
808 if (lstat(ref_file, &st) && errno == ENOENT)
809 lock->force_write = 1;
810 if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
811 lock->force_write = 1;
4bd18c43 812
5cc3cef9
JH
813 if (safe_create_leading_directories(ref_file)) {
814 last_errno = errno;
815 error("unable to create directory for %s", ref_file);
816 goto error_return;
817 }
434cd0cd 818 lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, 1);
4bd18c43
SP
819
820 return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
5cc3cef9
JH
821
822 error_return:
823 unlock_ref(lock);
824 errno = last_errno;
825 return NULL;
4bd18c43
SP
826}
827
4431fcc4 828struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1)
95fc7512 829{
53cce84c 830 char refpath[PATH_MAX];
95fc7512 831 if (check_ref_format(ref))
4bd18c43 832 return NULL;
53cce84c 833 strcpy(refpath, mkpath("refs/%s", ref));
68db31cc 834 return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
4bd18c43
SP
835}
836
68db31cc 837struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags)
4bd18c43 838{
5f7b202a 839 switch (check_ref_format(ref)) {
5f7b202a 840 default:
257f3020
JH
841 return NULL;
842 case 0:
843 case CHECK_REF_FORMAT_ONELEVEL:
5f7b202a
JH
844 return lock_ref_sha1_basic(ref, old_sha1, flags, NULL);
845 }
c0277d15
JH
846}
847
26a063a1
JH
848static struct lock_file packlock;
849
c0277d15
JH
850static int repack_without_ref(const char *refname)
851{
852 struct ref_list *list, *packed_ref_list;
853 int fd;
854 int found = 0;
c0277d15
JH
855
856 packed_ref_list = get_packed_refs();
857 for (list = packed_ref_list; list; list = list->next) {
858 if (!strcmp(refname, list->name)) {
859 found = 1;
860 break;
861 }
862 }
863 if (!found)
864 return 0;
c0277d15
JH
865 fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
866 if (fd < 0)
867 return error("cannot delete '%s' from packed refs", refname);
868
869 for (list = packed_ref_list; list; list = list->next) {
870 char line[PATH_MAX + 100];
871 int len;
872
873 if (!strcmp(refname, list->name))
874 continue;
875 len = snprintf(line, sizeof(line), "%s %s\n",
876 sha1_to_hex(list->sha1), list->name);
877 /* this should not happen but just being defensive */
878 if (len > sizeof(line))
879 die("too long a refname '%s'", list->name);
880 write_or_die(fd, line, len);
881 }
882 return commit_lock_file(&packlock);
883}
884
1401f46b 885int delete_ref(const char *refname, const unsigned char *sha1)
c0277d15
JH
886{
887 struct ref_lock *lock;
888 int err, i, ret = 0, flag = 0;
889
68db31cc 890 lock = lock_ref_sha1_basic(refname, sha1, 0, &flag);
c0277d15
JH
891 if (!lock)
892 return 1;
893 if (!(flag & REF_ISPACKED)) {
894 /* loose */
895 i = strlen(lock->lk->filename) - 5; /* .lock */
896 lock->lk->filename[i] = 0;
897 err = unlink(lock->lk->filename);
898 if (err) {
899 ret = 1;
900 error("unlink(%s) failed: %s",
901 lock->lk->filename, strerror(errno));
902 }
903 lock->lk->filename[i] = '.';
904 }
905 /* removing the loose one could have resurrected an earlier
906 * packed one. Also, if it was not loose we need to repack
907 * without it.
908 */
909 ret |= repack_without_ref(refname);
910
9a13f0b7 911 err = unlink(git_path("logs/%s", lock->ref_name));
c0277d15
JH
912 if (err && errno != ENOENT)
913 fprintf(stderr, "warning: unlink(%s) failed: %s",
9a13f0b7 914 git_path("logs/%s", lock->ref_name), strerror(errno));
c0277d15
JH
915 invalidate_cached_refs();
916 unlock_ref(lock);
917 return ret;
4bd18c43
SP
918}
919
678d0f4c 920int rename_ref(const char *oldref, const char *newref, const char *logmsg)
c976d415
LH
921{
922 static const char renamed_ref[] = "RENAMED-REF";
923 unsigned char sha1[20], orig_sha1[20];
924 int flag = 0, logmoved = 0;
925 struct ref_lock *lock;
c976d415 926 struct stat loginfo;
16c2bfbb 927 int log = !lstat(git_path("logs/%s", oldref), &loginfo);
c976d415
LH
928
929 if (S_ISLNK(loginfo.st_mode))
930 return error("reflog for %s is a symlink", oldref);
931
932 if (!resolve_ref(oldref, orig_sha1, 1, &flag))
933 return error("refname %s not found", oldref);
934
935 if (!is_refname_available(newref, oldref, get_packed_refs(), 0))
936 return 1;
937
938 if (!is_refname_available(newref, oldref, get_loose_refs(), 0))
939 return 1;
940
68db31cc 941 lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL);
c976d415
LH
942 if (!lock)
943 return error("unable to lock %s", renamed_ref);
944 lock->force_write = 1;
678d0f4c 945 if (write_ref_sha1(lock, orig_sha1, logmsg))
c976d415
LH
946 return error("unable to save current sha1 in %s", renamed_ref);
947
948 if (log && rename(git_path("logs/%s", oldref), git_path("tmp-renamed-log")))
949 return error("unable to move logfile logs/%s to tmp-renamed-log: %s",
950 oldref, strerror(errno));
951
952 if (delete_ref(oldref, orig_sha1)) {
953 error("unable to delete old %s", oldref);
954 goto rollback;
955 }
956
957 if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1)) {
958 if (errno==EISDIR) {
959 if (remove_empty_directories(git_path("%s", newref))) {
960 error("Directory not empty: %s", newref);
961 goto rollback;
962 }
963 } else {
964 error("unable to delete existing %s", newref);
965 goto rollback;
966 }
967 }
968
969 if (log && safe_create_leading_directories(git_path("logs/%s", newref))) {
970 error("unable to create directory for %s", newref);
971 goto rollback;
972 }
973
974 retry:
975 if (log && rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref))) {
d9e74d57
JR
976 if (errno==EISDIR || errno==ENOTDIR) {
977 /*
978 * rename(a, b) when b is an existing
979 * directory ought to result in ISDIR, but
980 * Solaris 5.8 gives ENOTDIR. Sheesh.
981 */
c976d415
LH
982 if (remove_empty_directories(git_path("logs/%s", newref))) {
983 error("Directory not empty: logs/%s", newref);
984 goto rollback;
985 }
986 goto retry;
987 } else {
988 error("unable to move logfile tmp-renamed-log to logs/%s: %s",
989 newref, strerror(errno));
990 goto rollback;
991 }
992 }
993 logmoved = log;
994
68db31cc 995 lock = lock_ref_sha1_basic(newref, NULL, 0, NULL);
c976d415
LH
996 if (!lock) {
997 error("unable to lock %s for update", newref);
998 goto rollback;
999 }
1000
1001 lock->force_write = 1;
1002 hashcpy(lock->old_sha1, orig_sha1);
678d0f4c 1003 if (write_ref_sha1(lock, orig_sha1, logmsg)) {
c976d415
LH
1004 error("unable to write current sha1 into %s", newref);
1005 goto rollback;
1006 }
1007
1008 return 0;
1009
1010 rollback:
68db31cc 1011 lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL);
c976d415
LH
1012 if (!lock) {
1013 error("unable to lock %s for rollback", oldref);
1014 goto rollbacklog;
1015 }
1016
1017 lock->force_write = 1;
1018 flag = log_all_ref_updates;
1019 log_all_ref_updates = 0;
1020 if (write_ref_sha1(lock, orig_sha1, NULL))
1021 error("unable to write current sha1 into %s", oldref);
1022 log_all_ref_updates = flag;
1023
1024 rollbacklog:
1025 if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref)))
1026 error("unable to restore logfile %s from %s: %s",
1027 oldref, newref, strerror(errno));
1028 if (!logmoved && log &&
1029 rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref)))
1030 error("unable to restore logfile %s from tmp-renamed-log: %s",
1031 oldref, strerror(errno));
1032
1033 return 1;
1034}
1035
435fc852 1036int close_ref(struct ref_lock *lock)
b531394d
BC
1037{
1038 if (close_lock_file(lock->lk))
1039 return -1;
1040 lock->lock_fd = -1;
1041 return 0;
1042}
1043
435fc852 1044int commit_ref(struct ref_lock *lock)
b531394d
BC
1045{
1046 if (commit_lock_file(lock->lk))
1047 return -1;
1048 lock->lock_fd = -1;
1049 return 0;
1050}
1051
e5f38ec3 1052void unlock_ref(struct ref_lock *lock)
4bd18c43 1053{
4ed7cd3a
BC
1054 /* Do not free lock->lk -- atexit() still looks at them */
1055 if (lock->lk)
1056 rollback_lock_file(lock->lk);
434cd0cd 1057 free(lock->ref_name);
1655707c 1058 free(lock->orig_ref_name);
4bd18c43
SP
1059 free(lock);
1060}
1061
0ec29a47
JH
1062/*
1063 * copy the reflog message msg to buf, which has been allocated sufficiently
1064 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1065 * because reflog file is one line per entry.
1066 */
1067static int copy_msg(char *buf, const char *msg)
1068{
1069 char *cp = buf;
1070 char c;
1071 int wasspace = 1;
1072
1073 *cp++ = '\t';
1074 while ((c = *msg++)) {
1075 if (wasspace && isspace(c))
1076 continue;
1077 wasspace = isspace(c);
1078 if (wasspace)
1079 c = ' ';
1080 *cp++ = c;
1081 }
1082 while (buf < cp && isspace(cp[-1]))
1083 cp--;
1084 *cp++ = '\n';
1085 return cp - buf;
1086}
1087
9a13f0b7
NP
1088static int log_ref_write(const char *ref_name, const unsigned char *old_sha1,
1089 const unsigned char *new_sha1, const char *msg)
6de08ae6
SP
1090{
1091 int logfd, written, oflags = O_APPEND | O_WRONLY;
1092 unsigned maxlen, len;
8ac65937 1093 int msglen;
9a13f0b7 1094 char *log_file, *logrec;
ff4c8485 1095 const char *committer;
6de08ae6 1096
510c5a8e 1097 if (log_all_ref_updates < 0)
7d1864ce 1098 log_all_ref_updates = !is_bare_repository();
510c5a8e 1099
9a13f0b7
NP
1100 log_file = git_path("logs/%s", ref_name);
1101
4057deb5 1102 if (log_all_ref_updates &&
cc44c765
JH
1103 (!prefixcmp(ref_name, "refs/heads/") ||
1104 !prefixcmp(ref_name, "refs/remotes/") ||
bd104db1 1105 !strcmp(ref_name, "HEAD"))) {
9a13f0b7 1106 if (safe_create_leading_directories(log_file) < 0)
6de08ae6 1107 return error("unable to create directory for %s",
9a13f0b7 1108 log_file);
6de08ae6
SP
1109 oflags |= O_CREAT;
1110 }
1111
9a13f0b7 1112 logfd = open(log_file, oflags, 0666);
6de08ae6 1113 if (logfd < 0) {
1974bf62 1114 if (!(oflags & O_CREAT) && errno == ENOENT)
6de08ae6 1115 return 0;
3b463c3f
JH
1116
1117 if ((oflags & O_CREAT) && errno == EISDIR) {
9a13f0b7 1118 if (remove_empty_directories(log_file)) {
3b463c3f 1119 return error("There are still logs under '%s'",
9a13f0b7 1120 log_file);
3b463c3f 1121 }
9a13f0b7 1122 logfd = open(log_file, oflags, 0666);
3b463c3f
JH
1123 }
1124
1125 if (logfd < 0)
1126 return error("Unable to append to %s: %s",
9a13f0b7 1127 log_file, strerror(errno));
6de08ae6
SP
1128 }
1129
443b92b6
MK
1130 adjust_shared_perm(log_file);
1131
0ec29a47 1132 msglen = msg ? strlen(msg) : 0;
774751a8 1133 committer = git_committer_info(0);
8ac65937
JH
1134 maxlen = strlen(committer) + msglen + 100;
1135 logrec = xmalloc(maxlen);
1136 len = sprintf(logrec, "%s %s %s\n",
9a13f0b7
NP
1137 sha1_to_hex(old_sha1),
1138 sha1_to_hex(new_sha1),
8ac65937
JH
1139 committer);
1140 if (msglen)
0ec29a47 1141 len += copy_msg(logrec + len - 1, msg) - 1;
93822c22 1142 written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
6de08ae6 1143 free(logrec);
91c8d590 1144 if (close(logfd) != 0 || written != len)
9a13f0b7 1145 return error("Unable to append to %s", log_file);
6de08ae6
SP
1146 return 0;
1147}
1148
c3b0dec5
LT
1149static int is_branch(const char *refname)
1150{
1151 return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
1152}
1153
4bd18c43
SP
1154int write_ref_sha1(struct ref_lock *lock,
1155 const unsigned char *sha1, const char *logmsg)
1156{
1157 static char term = '\n';
c3b0dec5 1158 struct object *o;
4bd18c43
SP
1159
1160 if (!lock)
95fc7512 1161 return -1;
a89fccd2 1162 if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
4bd18c43
SP
1163 unlock_ref(lock);
1164 return 0;
95fc7512 1165 }
c3b0dec5
LT
1166 o = parse_object(sha1);
1167 if (!o) {
1168 error("Trying to write ref %s with nonexistant object %s",
1169 lock->ref_name, sha1_to_hex(sha1));
1170 unlock_ref(lock);
1171 return -1;
1172 }
1173 if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
1174 error("Trying to write non-commit object %s to branch %s",
1175 sha1_to_hex(sha1), lock->ref_name);
1176 unlock_ref(lock);
1177 return -1;
1178 }
93822c22
AW
1179 if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
1180 write_in_full(lock->lock_fd, &term, 1) != 1
b531394d 1181 || close_ref(lock) < 0) {
c33d5174 1182 error("Couldn't write %s", lock->lk->filename);
4bd18c43
SP
1183 unlock_ref(lock);
1184 return -1;
1185 }
5e290ff7 1186 invalidate_cached_refs();
bd104db1
NP
1187 if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
1188 (strcmp(lock->ref_name, lock->orig_ref_name) &&
1189 log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
6de08ae6
SP
1190 unlock_ref(lock);
1191 return -1;
1192 }
605fac8b
NP
1193 if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
1194 /*
1195 * Special hack: If a branch is updated directly and HEAD
1196 * points to it (may happen on the remote side of a push
1197 * for example) then logically the HEAD reflog should be
1198 * updated too.
1199 * A generic solution implies reverse symref information,
1200 * but finding all symrefs pointing to the given branch
1201 * would be rather costly for this rare event (the direct
1202 * update of a branch) to be worth it. So let's cheat and
1203 * check with HEAD only which should cover 99% of all usage
1204 * scenarios (even 100% of the default ones).
1205 */
1206 unsigned char head_sha1[20];
1207 int head_flag;
1208 const char *head_ref;
1209 head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag);
1210 if (head_ref && (head_flag & REF_ISSYMREF) &&
1211 !strcmp(head_ref, lock->ref_name))
1212 log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
1213 }
b531394d 1214 if (commit_ref(lock)) {
434cd0cd 1215 error("Couldn't set %s", lock->ref_name);
4bd18c43
SP
1216 unlock_ref(lock);
1217 return -1;
1218 }
4bd18c43
SP
1219 unlock_ref(lock);
1220 return 0;
95fc7512 1221}
d556fae2 1222
8b5157e4
NP
1223int create_symref(const char *ref_target, const char *refs_heads_master,
1224 const char *logmsg)
41b625b0
NP
1225{
1226 const char *lockpath;
1227 char ref[1000];
1228 int fd, len, written;
47fc52e2 1229 char *git_HEAD = xstrdup(git_path("%s", ref_target));
8b5157e4
NP
1230 unsigned char old_sha1[20], new_sha1[20];
1231
1232 if (logmsg && read_ref(ref_target, old_sha1))
1233 hashclr(old_sha1);
41b625b0 1234
d48744d1
JH
1235 if (safe_create_leading_directories(git_HEAD) < 0)
1236 return error("unable to create directory for %s", git_HEAD);
1237
41b625b0
NP
1238#ifndef NO_SYMLINK_HEAD
1239 if (prefer_symlink_refs) {
1240 unlink(git_HEAD);
1241 if (!symlink(refs_heads_master, git_HEAD))
8b5157e4 1242 goto done;
41b625b0
NP
1243 fprintf(stderr, "no symlink - falling back to symbolic ref\n");
1244 }
1245#endif
1246
1247 len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
1248 if (sizeof(ref) <= len) {
1249 error("refname too long: %s", refs_heads_master);
47fc52e2 1250 goto error_free_return;
41b625b0
NP
1251 }
1252 lockpath = mkpath("%s.lock", git_HEAD);
1253 fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
1254 if (fd < 0) {
1255 error("Unable to open %s for writing", lockpath);
47fc52e2 1256 goto error_free_return;
41b625b0
NP
1257 }
1258 written = write_in_full(fd, ref, len);
91c8d590 1259 if (close(fd) != 0 || written != len) {
41b625b0 1260 error("Unable to write to %s", lockpath);
47fc52e2 1261 goto error_unlink_return;
41b625b0
NP
1262 }
1263 if (rename(lockpath, git_HEAD) < 0) {
41b625b0 1264 error("Unable to create %s", git_HEAD);
47fc52e2 1265 goto error_unlink_return;
41b625b0
NP
1266 }
1267 if (adjust_shared_perm(git_HEAD)) {
41b625b0 1268 error("Unable to fix permissions on %s", lockpath);
47fc52e2
JH
1269 error_unlink_return:
1270 unlink(lockpath);
1271 error_free_return:
1272 free(git_HEAD);
1273 return -1;
41b625b0 1274 }
8b5157e4 1275
ee96d11b 1276#ifndef NO_SYMLINK_HEAD
8b5157e4 1277 done:
ee96d11b 1278#endif
8b5157e4
NP
1279 if (logmsg && !read_ref(refs_heads_master, new_sha1))
1280 log_ref_write(ref_target, old_sha1, new_sha1, logmsg);
1281
47fc52e2 1282 free(git_HEAD);
41b625b0
NP
1283 return 0;
1284}
1285
16d7cc90
JH
1286static char *ref_msg(const char *line, const char *endp)
1287{
1288 const char *ep;
16d7cc90 1289 line += 82;
182af834
PH
1290 ep = memchr(line, '\n', endp - line);
1291 if (!ep)
1292 ep = endp;
1293 return xmemdupz(line, ep - line);
16d7cc90
JH
1294}
1295
1296int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *sha1, char **msg, unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
d556fae2 1297{
e5229042 1298 const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
d556fae2 1299 char *tz_c;
e29cb53a 1300 int logfd, tz, reccnt = 0;
d556fae2
SP
1301 struct stat st;
1302 unsigned long date;
e5229042 1303 unsigned char logged_sha1[20];
cb48cb58 1304 void *log_mapped;
dc49cd76 1305 size_t mapsz;
d556fae2
SP
1306
1307 logfile = git_path("logs/%s", ref);
1308 logfd = open(logfile, O_RDONLY, 0);
1309 if (logfd < 0)
1310 die("Unable to read log %s: %s", logfile, strerror(errno));
1311 fstat(logfd, &st);
1312 if (!st.st_size)
1313 die("Log %s is empty.", logfile);
dc49cd76
SP
1314 mapsz = xsize_t(st.st_size);
1315 log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0);
cb48cb58 1316 logdata = log_mapped;
d556fae2
SP
1317 close(logfd);
1318
e5229042 1319 lastrec = NULL;
d556fae2
SP
1320 rec = logend = logdata + st.st_size;
1321 while (logdata < rec) {
e29cb53a 1322 reccnt++;
d556fae2
SP
1323 if (logdata < rec && *(rec-1) == '\n')
1324 rec--;
e5229042
SP
1325 lastgt = NULL;
1326 while (logdata < rec && *(rec-1) != '\n') {
d556fae2 1327 rec--;
e5229042
SP
1328 if (*rec == '>')
1329 lastgt = rec;
1330 }
1331 if (!lastgt)
d556fae2 1332 die("Log %s is corrupt.", logfile);
e5229042 1333 date = strtoul(lastgt + 1, &tz_c, 10);
ab2a1a32 1334 if (date <= at_time || cnt == 0) {
76a44c5c 1335 tz = strtoul(tz_c, NULL, 10);
16d7cc90
JH
1336 if (msg)
1337 *msg = ref_msg(rec, logend);
1338 if (cutoff_time)
1339 *cutoff_time = date;
1340 if (cutoff_tz)
1341 *cutoff_tz = tz;
1342 if (cutoff_cnt)
76a44c5c 1343 *cutoff_cnt = reccnt - 1;
e5229042
SP
1344 if (lastrec) {
1345 if (get_sha1_hex(lastrec, logged_sha1))
1346 die("Log %s is corrupt.", logfile);
1347 if (get_sha1_hex(rec + 41, sha1))
1348 die("Log %s is corrupt.", logfile);
a89fccd2 1349 if (hashcmp(logged_sha1, sha1)) {
e5229042
SP
1350 fprintf(stderr,
1351 "warning: Log %s has gap after %s.\n",
73013afd 1352 logfile, show_date(date, tz, DATE_RFC2822));
e5229042 1353 }
e5f38ec3
JH
1354 }
1355 else if (date == at_time) {
e5229042
SP
1356 if (get_sha1_hex(rec + 41, sha1))
1357 die("Log %s is corrupt.", logfile);
e5f38ec3
JH
1358 }
1359 else {
e5229042
SP
1360 if (get_sha1_hex(rec + 41, logged_sha1))
1361 die("Log %s is corrupt.", logfile);
a89fccd2 1362 if (hashcmp(logged_sha1, sha1)) {
e5229042
SP
1363 fprintf(stderr,
1364 "warning: Log %s unexpectedly ended on %s.\n",
73013afd 1365 logfile, show_date(date, tz, DATE_RFC2822));
e5229042
SP
1366 }
1367 }
dc49cd76 1368 munmap(log_mapped, mapsz);
d556fae2
SP
1369 return 0;
1370 }
e5229042 1371 lastrec = rec;
ab2a1a32
JH
1372 if (cnt > 0)
1373 cnt--;
d556fae2
SP
1374 }
1375
e5229042
SP
1376 rec = logdata;
1377 while (rec < logend && *rec != '>' && *rec != '\n')
1378 rec++;
1379 if (rec == logend || *rec == '\n')
d556fae2 1380 die("Log %s is corrupt.", logfile);
e5229042 1381 date = strtoul(rec + 1, &tz_c, 10);
d556fae2
SP
1382 tz = strtoul(tz_c, NULL, 10);
1383 if (get_sha1_hex(logdata, sha1))
1384 die("Log %s is corrupt.", logfile);
16d7cc90
JH
1385 if (msg)
1386 *msg = ref_msg(logdata, logend);
dc49cd76 1387 munmap(log_mapped, mapsz);
16d7cc90
JH
1388
1389 if (cutoff_time)
1390 *cutoff_time = date;
1391 if (cutoff_tz)
1392 *cutoff_tz = tz;
1393 if (cutoff_cnt)
1394 *cutoff_cnt = reccnt;
1395 return 1;
d556fae2 1396}
2ff81662 1397
883d60fa 1398int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data)
2ff81662
JH
1399{
1400 const char *logfile;
1401 FILE *logfp;
1402 char buf[1024];
2266bf27 1403 int ret = 0;
2ff81662
JH
1404
1405 logfile = git_path("logs/%s", ref);
1406 logfp = fopen(logfile, "r");
1407 if (!logfp)
883d60fa 1408 return -1;
2ff81662
JH
1409 while (fgets(buf, sizeof(buf), logfp)) {
1410 unsigned char osha1[20], nsha1[20];
883d60fa
JS
1411 char *email_end, *message;
1412 unsigned long timestamp;
2266bf27 1413 int len, tz;
2ff81662
JH
1414
1415 /* old SP new SP name <email> SP time TAB msg LF */
1416 len = strlen(buf);
1417 if (len < 83 || buf[len-1] != '\n' ||
1418 get_sha1_hex(buf, osha1) || buf[40] != ' ' ||
883d60fa
JS
1419 get_sha1_hex(buf + 41, nsha1) || buf[81] != ' ' ||
1420 !(email_end = strchr(buf + 82, '>')) ||
1421 email_end[1] != ' ' ||
1422 !(timestamp = strtoul(email_end + 2, &message, 10)) ||
1423 !message || message[0] != ' ' ||
1424 (message[1] != '+' && message[1] != '-') ||
1425 !isdigit(message[2]) || !isdigit(message[3]) ||
b4dd4856 1426 !isdigit(message[4]) || !isdigit(message[5]))
2ff81662 1427 continue; /* corrupt? */
883d60fa
JS
1428 email_end[1] = '\0';
1429 tz = strtol(message + 1, NULL, 10);
b4dd4856
JS
1430 if (message[6] != '\t')
1431 message += 6;
1432 else
1433 message += 7;
883d60fa
JS
1434 ret = fn(osha1, nsha1, buf+82, timestamp, tz, message, cb_data);
1435 if (ret)
2266bf27 1436 break;
2ff81662
JH
1437 }
1438 fclose(logfp);
2266bf27 1439 return ret;
2ff81662 1440}
e29cb53a 1441
eb8381c8
NP
1442static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data)
1443{
1444 DIR *dir = opendir(git_path("logs/%s", base));
fcee5a14 1445 int retval = 0;
eb8381c8
NP
1446
1447 if (dir) {
1448 struct dirent *de;
1449 int baselen = strlen(base);
1450 char *log = xmalloc(baselen + 257);
1451
1452 memcpy(log, base, baselen);
1453 if (baselen && base[baselen-1] != '/')
1454 log[baselen++] = '/';
1455
1456 while ((de = readdir(dir)) != NULL) {
1457 struct stat st;
1458 int namelen;
1459
1460 if (de->d_name[0] == '.')
1461 continue;
1462 namelen = strlen(de->d_name);
1463 if (namelen > 255)
1464 continue;
1465 if (has_extension(de->d_name, ".lock"))
1466 continue;
1467 memcpy(log + baselen, de->d_name, namelen+1);
1468 if (stat(git_path("logs/%s", log), &st) < 0)
1469 continue;
1470 if (S_ISDIR(st.st_mode)) {
1471 retval = do_for_each_reflog(log, fn, cb_data);
1472 } else {
1473 unsigned char sha1[20];
1474 if (!resolve_ref(log, sha1, 0, NULL))
1475 retval = error("bad ref for %s", log);
1476 else
1477 retval = fn(log, sha1, 0, cb_data);
1478 }
1479 if (retval)
1480 break;
1481 }
1482 free(log);
1483 closedir(dir);
1484 }
acb39f64 1485 else if (*base)
fcee5a14 1486 return errno;
eb8381c8
NP
1487 return retval;
1488}
1489
1490int for_each_reflog(each_ref_fn fn, void *cb_data)
1491{
1492 return do_for_each_reflog("", fn, cb_data);
1493}
3d9f037c
CR
1494
1495int update_ref(const char *action, const char *refname,
1496 const unsigned char *sha1, const unsigned char *oldval,
1497 int flags, enum action_on_err onerr)
1498{
1499 static struct ref_lock *lock;
1500 lock = lock_any_ref_for_update(refname, oldval, flags);
1501 if (!lock) {
1502 const char *str = "Cannot lock the ref '%s'.";
1503 switch (onerr) {
1504 case MSG_ON_ERR: error(str, refname); break;
1505 case DIE_ON_ERR: die(str, refname); break;
1506 case QUIET_ON_ERR: break;
1507 }
1508 return 1;
1509 }
1510 if (write_ref_sha1(lock, sha1, action) < 0) {
1511 const char *str = "Cannot update the ref '%s'.";
1512 switch (onerr) {
1513 case MSG_ON_ERR: error(str, refname); break;
1514 case DIE_ON_ERR: die(str, refname); break;
1515 case QUIET_ON_ERR: break;
1516 }
1517 return 1;
1518 }
1519 return 0;
1520}
cda69f48
JK
1521
1522struct ref *find_ref_by_name(struct ref *list, const char *name)
1523{
1524 for ( ; list; list = list->next)
1525 if (!strcmp(list->name, name))
1526 return list;
1527 return NULL;
1528}