resolve_ref(): expose REF_ISBROKEN flag
[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
98ac34b2
JH
7/* ISSYMREF=0x01, ISPACKED=0x02 and ISBROKEN=0x04 are public interfaces */
8#define REF_KNOWS_PEELED 0x10
f4204ab9 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);
dce4bab6
MH
58 if (check_refname_format(name, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT))
59 die("Reference has invalid format: '%s'", name);
e1e22e37 60 memcpy(entry->name, name, len);
8da19775 61 entry->flag = flag;
c774aab9 62 entry->next = list;
f4204ab9
JH
63 if (new_entry)
64 *new_entry = entry;
c774aab9
JP
65 return entry;
66}
67
68/* merge sort the ref list */
69static struct ref_list *sort_ref_list(struct ref_list *list)
70{
71 int psize, qsize, last_merge_count, cmp;
72 struct ref_list *p, *q, *l, *e;
73 struct ref_list *new_list = list;
74 int k = 1;
75 int merge_count = 0;
76
77 if (!list)
78 return list;
79
80 do {
81 last_merge_count = merge_count;
82 merge_count = 0;
83
84 psize = 0;
85
86 p = new_list;
87 q = new_list;
88 new_list = NULL;
89 l = NULL;
90
91 while (p) {
92 merge_count++;
93
94 while (psize < k && q->next) {
95 q = q->next;
96 psize++;
97 }
98 qsize = k;
99
100 while ((psize > 0) || (qsize > 0 && q)) {
101 if (qsize == 0 || !q) {
102 e = p;
103 p = p->next;
104 psize--;
105 } else if (psize == 0) {
106 e = q;
107 q = q->next;
108 qsize--;
109 } else {
110 cmp = strcmp(q->name, p->name);
111 if (cmp < 0) {
112 e = q;
113 q = q->next;
114 qsize--;
115 } else if (cmp > 0) {
116 e = p;
117 p = p->next;
118 psize--;
119 } else {
120 if (hashcmp(q->sha1, p->sha1))
121 die("Duplicated ref, and SHA1s don't match: %s",
122 q->name);
123 warning("Duplicated ref: %s", q->name);
124 e = q;
125 q = q->next;
126 qsize--;
127 free(e);
128 e = p;
129 p = p->next;
130 psize--;
131 }
132 }
133
134 e->next = NULL;
135
136 if (l)
137 l->next = e;
138 if (!new_list)
139 new_list = e;
140 l = e;
141 }
142
143 p = q;
144 };
145
146 k = k * 2;
147 } while ((last_merge_count != merge_count) || (last_merge_count != 1));
148
149 return new_list;
e1e22e37
LT
150}
151
5e290ff7
JH
152/*
153 * Future: need to be in "struct repository"
154 * when doing a full libification.
155 */
4175e9e3 156static struct cached_refs {
5e290ff7
JH
157 char did_loose;
158 char did_packed;
159 struct ref_list *loose;
160 struct ref_list *packed;
0bad611b 161} cached_refs, submodule_refs;
0ae91be0 162static struct ref_list *current_ref;
5e290ff7 163
e142a3c6
DB
164static struct ref_list *extra_refs;
165
5e290ff7
JH
166static void free_ref_list(struct ref_list *list)
167{
168 struct ref_list *next;
169 for ( ; list; list = next) {
170 next = list->next;
171 free(list);
172 }
173}
174
175static void invalidate_cached_refs(void)
e1e22e37 176{
5e290ff7
JH
177 struct cached_refs *ca = &cached_refs;
178
179 if (ca->did_loose && ca->loose)
180 free_ref_list(ca->loose);
181 if (ca->did_packed && ca->packed)
182 free_ref_list(ca->packed);
183 ca->loose = ca->packed = NULL;
184 ca->did_loose = ca->did_packed = 0;
185}
e1e22e37 186
f4204ab9
JH
187static void read_packed_refs(FILE *f, struct cached_refs *cached_refs)
188{
189 struct ref_list *list = NULL;
190 struct ref_list *last = NULL;
191 char refline[PATH_MAX];
192 int flag = REF_ISPACKED;
193
194 while (fgets(refline, sizeof(refline), f)) {
195 unsigned char sha1[20];
196 const char *name;
197 static const char header[] = "# pack-refs with:";
198
199 if (!strncmp(refline, header, sizeof(header)-1)) {
200 const char *traits = refline + sizeof(header) - 1;
201 if (strstr(traits, " peeled "))
202 flag |= REF_KNOWS_PEELED;
203 /* perhaps other traits later as well */
204 continue;
205 }
206
207 name = parse_ref_line(refline, sha1);
208 if (name) {
209 list = add_ref(name, sha1, flag, list, &last);
210 continue;
211 }
212 if (last &&
213 refline[0] == '^' &&
214 strlen(refline) == 42 &&
215 refline[41] == '\n' &&
216 !get_sha1_hex(refline + 1, sha1))
217 hashcpy(last->peeled, sha1);
218 }
c774aab9 219 cached_refs->packed = sort_ref_list(list);
f4204ab9
JH
220}
221
e142a3c6
DB
222void add_extra_ref(const char *name, const unsigned char *sha1, int flag)
223{
224 extra_refs = add_ref(name, sha1, flag, extra_refs, NULL);
225}
226
227void clear_extra_refs(void)
228{
229 free_ref_list(extra_refs);
230 extra_refs = NULL;
231}
232
0bad611b 233static struct ref_list *get_packed_refs(const char *submodule)
5e290ff7 234{
0bad611b
HV
235 const char *packed_refs_file;
236 struct cached_refs *refs;
237
238 if (submodule) {
239 packed_refs_file = git_path_submodule(submodule, "packed-refs");
240 refs = &submodule_refs;
241 free_ref_list(refs->packed);
242 } else {
243 packed_refs_file = git_path("packed-refs");
244 refs = &cached_refs;
245 }
246
247 if (!refs->did_packed || submodule) {
248 FILE *f = fopen(packed_refs_file, "r");
249 refs->packed = NULL;
e1e22e37 250 if (f) {
0bad611b 251 read_packed_refs(f, refs);
e1e22e37 252 fclose(f);
e1e22e37 253 }
0bad611b 254 refs->did_packed = 1;
e1e22e37 255 }
0bad611b 256 return refs->packed;
e1e22e37
LT
257}
258
0bad611b
HV
259static struct ref_list *get_ref_dir(const char *submodule, const char *base,
260 struct ref_list *list)
e1e22e37 261{
0bad611b
HV
262 DIR *dir;
263 const char *path;
264
265 if (submodule)
266 path = git_path_submodule(submodule, "%s", base);
267 else
268 path = git_path("%s", base);
269
270
271 dir = opendir(path);
e1e22e37
LT
272
273 if (dir) {
274 struct dirent *de;
275 int baselen = strlen(base);
ed378ec7 276 char *ref = xmalloc(baselen + 257);
e1e22e37 277
ed378ec7 278 memcpy(ref, base, baselen);
e1e22e37 279 if (baselen && base[baselen-1] != '/')
ed378ec7 280 ref[baselen++] = '/';
e1e22e37
LT
281
282 while ((de = readdir(dir)) != NULL) {
283 unsigned char sha1[20];
284 struct stat st;
8da19775 285 int flag;
e1e22e37 286 int namelen;
0bad611b 287 const char *refdir;
e1e22e37
LT
288
289 if (de->d_name[0] == '.')
290 continue;
291 namelen = strlen(de->d_name);
292 if (namelen > 255)
293 continue;
294 if (has_extension(de->d_name, ".lock"))
295 continue;
ed378ec7 296 memcpy(ref + baselen, de->d_name, namelen+1);
0bad611b
HV
297 refdir = submodule
298 ? git_path_submodule(submodule, "%s", ref)
299 : git_path("%s", ref);
300 if (stat(refdir, &st) < 0)
e1e22e37
LT
301 continue;
302 if (S_ISDIR(st.st_mode)) {
0bad611b 303 list = get_ref_dir(submodule, ref, list);
e1e22e37
LT
304 continue;
305 }
0bad611b 306 if (submodule) {
f8948e2f 307 hashclr(sha1);
0bad611b
HV
308 flag = 0;
309 if (resolve_gitlink_ref(submodule, ref, sha1) < 0) {
310 hashclr(sha1);
98ac34b2 311 flag |= REF_ISBROKEN;
0bad611b
HV
312 }
313 } else
314 if (!resolve_ref(ref, sha1, 1, &flag)) {
315 hashclr(sha1);
98ac34b2 316 flag |= REF_ISBROKEN;
0bad611b 317 }
f4204ab9 318 list = add_ref(ref, sha1, flag, list, NULL);
e1e22e37 319 }
ed378ec7 320 free(ref);
e1e22e37
LT
321 closedir(dir);
322 }
c774aab9 323 return sort_ref_list(list);
e1e22e37
LT
324}
325
f8948e2f 326struct warn_if_dangling_data {
3cf6134a 327 FILE *fp;
f8948e2f
JH
328 const char *refname;
329 const char *msg_fmt;
330};
331
332static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1,
333 int flags, void *cb_data)
334{
335 struct warn_if_dangling_data *d = cb_data;
336 const char *resolves_to;
337 unsigned char junk[20];
338
339 if (!(flags & REF_ISSYMREF))
340 return 0;
341
342 resolves_to = resolve_ref(refname, junk, 0, NULL);
343 if (!resolves_to || strcmp(resolves_to, d->refname))
344 return 0;
345
3cf6134a 346 fprintf(d->fp, d->msg_fmt, refname);
f8948e2f
JH
347 return 0;
348}
349
3cf6134a 350void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
f8948e2f 351{
66dbfd55
GV
352 struct warn_if_dangling_data data;
353
354 data.fp = fp;
355 data.refname = refname;
356 data.msg_fmt = msg_fmt;
f8948e2f
JH
357 for_each_rawref(warn_if_dangling_symref, &data);
358}
359
0bad611b 360static struct ref_list *get_loose_refs(const char *submodule)
e1e22e37 361{
0bad611b
HV
362 if (submodule) {
363 free_ref_list(submodule_refs.loose);
364 submodule_refs.loose = get_ref_dir(submodule, "refs", NULL);
365 return submodule_refs.loose;
366 }
367
5e290ff7 368 if (!cached_refs.did_loose) {
0bad611b 369 cached_refs.loose = get_ref_dir(NULL, "refs", NULL);
5e290ff7 370 cached_refs.did_loose = 1;
e1e22e37 371 }
5e290ff7 372 return cached_refs.loose;
e1e22e37
LT
373}
374
ca8db142
LT
375/* We allow "recursive" symbolic refs. Only within reason, though */
376#define MAXDEPTH 5
0ebde32c
LT
377#define MAXREFLEN (1024)
378
379static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result)
380{
381 FILE *f;
382 struct cached_refs refs;
383 struct ref_list *ref;
384 int retval;
385
386 strcpy(name + pathlen, "packed-refs");
387 f = fopen(name, "r");
388 if (!f)
389 return -1;
390 read_packed_refs(f, &refs);
391 fclose(f);
392 ref = refs.packed;
393 retval = -1;
394 while (ref) {
395 if (!strcmp(ref->name, refname)) {
396 retval = 0;
397 memcpy(result, ref->sha1, 20);
398 break;
399 }
400 ref = ref->next;
401 }
402 free_ref_list(refs.packed);
403 return retval;
404}
405
406static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion)
407{
408 int fd, len = strlen(refname);
409 char buffer[128], *p;
410
411 if (recursion > MAXDEPTH || len > MAXREFLEN)
412 return -1;
413 memcpy(name + pathlen, refname, len+1);
414 fd = open(name, O_RDONLY);
415 if (fd < 0)
416 return resolve_gitlink_packed_ref(name, pathlen, refname, result);
417
418 len = read(fd, buffer, sizeof(buffer)-1);
419 close(fd);
420 if (len < 0)
421 return -1;
422 while (len && isspace(buffer[len-1]))
423 len--;
424 buffer[len] = 0;
425
426 /* Was it a detached head or an old-fashioned symlink? */
427 if (!get_sha1_hex(buffer, result))
428 return 0;
429
430 /* Symref? */
431 if (strncmp(buffer, "ref:", 4))
432 return -1;
433 p = buffer + 4;
434 while (isspace(*p))
435 p++;
436
437 return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1);
438}
439
440int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result)
441{
442 int len = strlen(path), retval;
443 char *gitdir;
842abf06 444 const char *tmp;
0ebde32c
LT
445
446 while (len && path[len-1] == '/')
447 len--;
448 if (!len)
449 return -1;
450 gitdir = xmalloc(len + MAXREFLEN + 8);
451 memcpy(gitdir, path, len);
842abf06
LH
452 memcpy(gitdir + len, "/.git", 6);
453 len += 5;
454
13d6ec91 455 tmp = read_gitfile(gitdir);
842abf06
LH
456 if (tmp) {
457 free(gitdir);
458 len = strlen(tmp);
459 gitdir = xmalloc(len + MAXREFLEN + 3);
460 memcpy(gitdir, tmp, len);
461 }
462 gitdir[len] = '/';
463 gitdir[++len] = '\0';
464 retval = resolve_gitlink_ref_recursive(gitdir, len, refname, result, 0);
0ebde32c
LT
465 free(gitdir);
466 return retval;
467}
ca8db142 468
c224ca7f
MH
469/*
470 * Try to read ref from the packed references. On success, set sha1
471 * and return 0; otherwise, return -1.
472 */
473static int get_packed_ref(const char *ref, unsigned char *sha1)
474{
475 struct ref_list *list = get_packed_refs(NULL);
476 while (list) {
477 if (!strcmp(ref, list->name)) {
478 hashcpy(sha1, list->sha1);
479 return 0;
480 }
481 list = list->next;
482 }
483 return -1;
484}
485
8da19775 486const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag)
8a65ff76 487{
0104ca09
HO
488 int depth = MAXDEPTH;
489 ssize_t len;
a876ed83 490 char buffer[256];
ed378ec7 491 static char ref_buffer[256];
629cd3ac 492 char path[PATH_MAX];
ca8db142 493
8da19775
JH
494 if (flag)
495 *flag = 0;
496
8384d788
MH
497 if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL))
498 return NULL;
499
a876ed83
JH
500 for (;;) {
501 struct stat st;
502 char *buf;
503 int fd;
8a65ff76 504
a876ed83
JH
505 if (--depth < 0)
506 return NULL;
ca8db142 507
958a4789 508 git_snpath(path, sizeof(path), "%s", ref);
c224ca7f 509
a876ed83 510 if (lstat(path, &st) < 0) {
c224ca7f
MH
511 if (errno != ENOENT)
512 return NULL;
513 /*
514 * The loose reference file does not exist;
515 * check for a packed reference.
516 */
517 if (!get_packed_ref(ref, sha1)) {
518 if (flag)
519 *flag |= REF_ISPACKED;
520 return ref;
434cd0cd 521 }
c224ca7f
MH
522 /* The reference is not a packed reference, either. */
523 if (reading) {
a876ed83 524 return NULL;
c224ca7f
MH
525 } else {
526 hashclr(sha1);
527 return ref;
528 }
a876ed83 529 }
ca8db142 530
a876ed83
JH
531 /* Follow "normalized" - ie "refs/.." symlinks by hand */
532 if (S_ISLNK(st.st_mode)) {
533 len = readlink(path, buffer, sizeof(buffer)-1);
7bb2bf8e
MH
534 if (len < 0)
535 return NULL;
b54cb795 536 buffer[len] = 0;
1f58a038
MH
537 if (!prefixcmp(buffer, "refs/") &&
538 !check_refname_format(buffer, 0)) {
ed378ec7
LT
539 strcpy(ref_buffer, buffer);
540 ref = ref_buffer;
8da19775
JH
541 if (flag)
542 *flag |= REF_ISSYMREF;
a876ed83
JH
543 continue;
544 }
ca8db142 545 }
a876ed83 546
7a21632f
DS
547 /* Is it a directory? */
548 if (S_ISDIR(st.st_mode)) {
549 errno = EISDIR;
550 return NULL;
551 }
552
a876ed83
JH
553 /*
554 * Anything else, just open it and try to use it as
555 * a ref
556 */
557 fd = open(path, O_RDONLY);
558 if (fd < 0)
559 return NULL;
93d26e4c 560 len = read_in_full(fd, buffer, sizeof(buffer)-1);
a876ed83 561 close(fd);
28775050
MH
562 if (len < 0)
563 return NULL;
564 while (len && isspace(buffer[len-1]))
565 len--;
566 buffer[len] = '\0';
a876ed83
JH
567
568 /*
569 * Is it a symbolic ref?
570 */
28775050 571 if (prefixcmp(buffer, "ref:"))
a876ed83
JH
572 break;
573 buf = buffer + 4;
28775050
MH
574 while (isspace(*buf))
575 buf++;
313fb010
MH
576 if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) {
577 warning("symbolic reference in %s is formatted incorrectly",
578 path);
579 return NULL;
580 }
28775050 581 ref = strcpy(ref_buffer, buf);
8da19775
JH
582 if (flag)
583 *flag |= REF_ISSYMREF;
8a65ff76 584 }
f989fea0
MH
585 /* Please note that FETCH_HEAD has a second line containing other data. */
586 if (get_sha1_hex(buffer, sha1) || (buffer[40] != '\0' && !isspace(buffer[40]))) {
629cd3ac 587 warning("reference in %s is formatted incorrectly", path);
a876ed83 588 return NULL;
629cd3ac 589 }
ed378ec7 590 return ref;
a876ed83
JH
591}
592
d08bae7e
IL
593/* The argument to filter_refs */
594struct ref_filter {
595 const char *pattern;
596 each_ref_fn *fn;
597 void *cb_data;
598};
599
ed378ec7 600int read_ref(const char *ref, unsigned char *sha1)
a876ed83 601{
8da19775 602 if (resolve_ref(ref, sha1, 1, NULL))
a876ed83
JH
603 return 0;
604 return -1;
8a65ff76
LT
605}
606
f8948e2f 607#define DO_FOR_EACH_INCLUDE_BROKEN 01
ef06b918 608static int do_one_ref(const char *base, each_ref_fn fn, int trim,
f8948e2f 609 int flags, void *cb_data, struct ref_list *entry)
ef06b918 610{
b3cfc406 611 if (prefixcmp(entry->name, base))
ef06b918 612 return 0;
e01de1c9 613
f8948e2f 614 if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) {
98ac34b2
JH
615 if (entry->flag & REF_ISBROKEN)
616 return 0; /* ignore broken refs e.g. dangling symref */
f8948e2f
JH
617 if (!has_sha1_file(entry->sha1)) {
618 error("%s does not point to a valid object!", entry->name);
619 return 0;
620 }
ef06b918 621 }
0ae91be0 622 current_ref = entry;
ef06b918
JH
623 return fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
624}
625
d08bae7e
IL
626static int filter_refs(const char *ref, const unsigned char *sha, int flags,
627 void *data)
628{
629 struct ref_filter *filter = (struct ref_filter *)data;
630 if (fnmatch(filter->pattern, ref, 0))
631 return 0;
632 return filter->fn(ref, sha, flags, filter->cb_data);
633}
634
cf0adba7
JH
635int peel_ref(const char *ref, unsigned char *sha1)
636{
637 int flag;
638 unsigned char base[20];
639 struct object *o;
640
0ae91be0
SP
641 if (current_ref && (current_ref->name == ref
642 || !strcmp(current_ref->name, ref))) {
643 if (current_ref->flag & REF_KNOWS_PEELED) {
644 hashcpy(sha1, current_ref->peeled);
645 return 0;
646 }
647 hashcpy(base, current_ref->sha1);
648 goto fallback;
649 }
650
cf0adba7
JH
651 if (!resolve_ref(ref, base, 1, &flag))
652 return -1;
653
654 if ((flag & REF_ISPACKED)) {
0bad611b 655 struct ref_list *list = get_packed_refs(NULL);
cf0adba7
JH
656
657 while (list) {
f4204ab9
JH
658 if (!strcmp(list->name, ref)) {
659 if (list->flag & REF_KNOWS_PEELED) {
660 hashcpy(sha1, list->peeled);
661 return 0;
662 }
663 /* older pack-refs did not leave peeled ones */
664 break;
cf0adba7
JH
665 }
666 list = list->next;
667 }
cf0adba7
JH
668 }
669
0ae91be0 670fallback:
cf0adba7 671 o = parse_object(base);
8c87dc77 672 if (o && o->type == OBJ_TAG) {
cf0adba7
JH
673 o = deref_tag(o, ref, 0);
674 if (o) {
675 hashcpy(sha1, o->sha1);
676 return 0;
677 }
678 }
679 return -1;
680}
681
0bad611b
HV
682static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn,
683 int trim, int flags, void *cb_data)
8a65ff76 684{
0ae91be0 685 int retval = 0;
0bad611b
HV
686 struct ref_list *packed = get_packed_refs(submodule);
687 struct ref_list *loose = get_loose_refs(submodule);
8a65ff76 688
e142a3c6
DB
689 struct ref_list *extra;
690
691 for (extra = extra_refs; extra; extra = extra->next)
f8948e2f 692 retval = do_one_ref(base, fn, trim, flags, cb_data, extra);
e142a3c6 693
e1e22e37
LT
694 while (packed && loose) {
695 struct ref_list *entry;
696 int cmp = strcmp(packed->name, loose->name);
697 if (!cmp) {
698 packed = packed->next;
699 continue;
6cada6a9 700 }
e1e22e37
LT
701 if (cmp > 0) {
702 entry = loose;
703 loose = loose->next;
704 } else {
705 entry = packed;
706 packed = packed->next;
707 }
f8948e2f 708 retval = do_one_ref(base, fn, trim, flags, cb_data, entry);
e1e22e37 709 if (retval)
0ae91be0 710 goto end_each;
e1e22e37 711 }
8a65ff76 712
ef06b918 713 for (packed = packed ? packed : loose; packed; packed = packed->next) {
f8948e2f 714 retval = do_one_ref(base, fn, trim, flags, cb_data, packed);
ef06b918 715 if (retval)
0ae91be0 716 goto end_each;
8a65ff76 717 }
0ae91be0
SP
718
719end_each:
720 current_ref = NULL;
721 return retval;
8a65ff76
LT
722}
723
0bad611b
HV
724
725static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data)
723c31fe
LT
726{
727 unsigned char sha1[20];
8da19775
JH
728 int flag;
729
0bad611b
HV
730 if (submodule) {
731 if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0)
732 return fn("HEAD", sha1, 0, cb_data);
733
734 return 0;
735 }
736
8da19775
JH
737 if (resolve_ref("HEAD", sha1, 1, &flag))
738 return fn("HEAD", sha1, flag, cb_data);
0bad611b 739
2f34ba32 740 return 0;
723c31fe
LT
741}
742
0bad611b
HV
743int head_ref(each_ref_fn fn, void *cb_data)
744{
745 return do_head_ref(NULL, fn, cb_data);
746}
747
9ef6aeb0
HV
748int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
749{
750 return do_head_ref(submodule, fn, cb_data);
751}
752
cb5d709f 753int for_each_ref(each_ref_fn fn, void *cb_data)
8a65ff76 754{
b3cfc406 755 return do_for_each_ref(NULL, "", fn, 0, 0, cb_data);
a62be77f
SE
756}
757
9ef6aeb0
HV
758int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
759{
b3cfc406 760 return do_for_each_ref(submodule, "", fn, 0, 0, cb_data);
a62be77f
SE
761}
762
2a8177b6
CC
763int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
764{
0bad611b 765 return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data);
2a8177b6
CC
766}
767
9ef6aeb0
HV
768int for_each_ref_in_submodule(const char *submodule, const char *prefix,
769 each_ref_fn fn, void *cb_data)
770{
771 return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data);
2a8177b6
CC
772}
773
cb5d709f 774int for_each_tag_ref(each_ref_fn fn, void *cb_data)
a62be77f 775{
2a8177b6 776 return for_each_ref_in("refs/tags/", fn, cb_data);
a62be77f
SE
777}
778
9ef6aeb0
HV
779int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
780{
781 return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data);
782}
783
cb5d709f 784int for_each_branch_ref(each_ref_fn fn, void *cb_data)
a62be77f 785{
2a8177b6 786 return for_each_ref_in("refs/heads/", fn, cb_data);
a62be77f
SE
787}
788
9ef6aeb0
HV
789int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
790{
791 return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data);
792}
793
cb5d709f 794int for_each_remote_ref(each_ref_fn fn, void *cb_data)
a62be77f 795{
2a8177b6 796 return for_each_ref_in("refs/remotes/", fn, cb_data);
f8948e2f
JH
797}
798
9ef6aeb0
HV
799int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
800{
801 return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data);
802}
803
29268700
CC
804int for_each_replace_ref(each_ref_fn fn, void *cb_data)
805{
0bad611b 806 return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data);
29268700
CC
807}
808
a1bea2c1
JT
809int head_ref_namespaced(each_ref_fn fn, void *cb_data)
810{
811 struct strbuf buf = STRBUF_INIT;
812 int ret = 0;
813 unsigned char sha1[20];
814 int flag;
815
816 strbuf_addf(&buf, "%sHEAD", get_git_namespace());
817 if (resolve_ref(buf.buf, sha1, 1, &flag))
818 ret = fn(buf.buf, sha1, flag, cb_data);
819 strbuf_release(&buf);
820
821 return ret;
822}
823
824int for_each_namespaced_ref(each_ref_fn fn, void *cb_data)
825{
826 struct strbuf buf = STRBUF_INIT;
827 int ret;
828 strbuf_addf(&buf, "%srefs/", get_git_namespace());
829 ret = do_for_each_ref(NULL, buf.buf, fn, 0, 0, cb_data);
830 strbuf_release(&buf);
831 return ret;
832}
833
b09fe971
IL
834int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
835 const char *prefix, void *cb_data)
d08bae7e
IL
836{
837 struct strbuf real_pattern = STRBUF_INIT;
838 struct ref_filter filter;
d08bae7e
IL
839 int ret;
840
b09fe971 841 if (!prefix && prefixcmp(pattern, "refs/"))
d08bae7e 842 strbuf_addstr(&real_pattern, "refs/");
b09fe971
IL
843 else if (prefix)
844 strbuf_addstr(&real_pattern, prefix);
d08bae7e
IL
845 strbuf_addstr(&real_pattern, pattern);
846
894a9d33 847 if (!has_glob_specials(pattern)) {
9517e6b8 848 /* Append implied '/' '*' if not present. */
d08bae7e
IL
849 if (real_pattern.buf[real_pattern.len - 1] != '/')
850 strbuf_addch(&real_pattern, '/');
851 /* No need to check for '*', there is none. */
852 strbuf_addch(&real_pattern, '*');
853 }
854
855 filter.pattern = real_pattern.buf;
856 filter.fn = fn;
857 filter.cb_data = cb_data;
858 ret = for_each_ref(filter_refs, &filter);
859
860 strbuf_release(&real_pattern);
861 return ret;
862}
863
b09fe971
IL
864int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data)
865{
866 return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
867}
868
f8948e2f
JH
869int for_each_rawref(each_ref_fn fn, void *cb_data)
870{
b3cfc406 871 return do_for_each_ref(NULL, "", fn, 0,
f8948e2f 872 DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
8a65ff76
LT
873}
874
03feddd6
JH
875/*
876 * Make sure "ref" is something reasonable to have under ".git/refs/";
877 * We do not like it if:
878 *
879 * - any path component of it begins with ".", or
880 * - it has double dots "..", or
881 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
882 * - it ends with a "/".
3e262b95 883 * - it ends with ".lock"
a4c2e699 884 * - it contains a "\" (backslash)
03feddd6
JH
885 */
886
9224b73b 887/* Return true iff ch is not allowed in reference names. */
03feddd6
JH
888static inline int bad_ref_char(int ch)
889{
f3738c1c 890 if (((unsigned) ch) <= ' ' || ch == 0x7f ||
a4c2e699 891 ch == '~' || ch == '^' || ch == ':' || ch == '\\')
8558fd9e
DB
892 return 1;
893 /* 2.13 Pattern Matching Notation */
9224b73b 894 if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */
8558fd9e 895 return 1;
8558fd9e 896 return 0;
03feddd6
JH
897}
898
49295d4e
MH
899/*
900 * Try to read one refname component from the front of ref. Return
901 * the length of the component found, or -1 if the component is not
902 * legal.
903 */
dce4bab6 904static int check_refname_component(const char *ref, int flags)
49295d4e
MH
905{
906 const char *cp;
907 char last = '\0';
908
909 for (cp = ref; ; cp++) {
910 char ch = *cp;
911 if (ch == '\0' || ch == '/')
912 break;
913 if (bad_ref_char(ch))
914 return -1; /* Illegal character in refname. */
915 if (last == '.' && ch == '.')
916 return -1; /* Refname contains "..". */
917 if (last == '@' && ch == '{')
918 return -1; /* Refname contains "@{". */
919 last = ch;
920 }
921 if (cp == ref)
922 return -1; /* Component has zero length. */
dce4bab6
MH
923 if (ref[0] == '.') {
924 if (!(flags & REFNAME_DOT_COMPONENT))
925 return -1; /* Component starts with '.'. */
926 /*
927 * Even if leading dots are allowed, don't allow "."
928 * as a component (".." is prevented by a rule above).
929 */
930 if (ref[1] == '\0')
931 return -1; /* Component equals ".". */
932 }
7e9d2fe9
MH
933 if (cp - ref >= 5 && !memcmp(cp - 5, ".lock", 5))
934 return -1; /* Refname ends with ".lock". */
49295d4e
MH
935 return cp - ref;
936}
937
8d9c5010 938int check_refname_format(const char *ref, int flags)
95fc7512 939{
49295d4e 940 int component_len, component_count = 0;
03feddd6 941
03feddd6 942 while (1) {
49295d4e 943 /* We are at the start of a path component. */
dce4bab6 944 component_len = check_refname_component(ref, flags);
49295d4e
MH
945 if (component_len < 0) {
946 if ((flags & REFNAME_REFSPEC_PATTERN) &&
947 ref[0] == '*' &&
948 (ref[1] == '\0' || ref[1] == '/')) {
8d9c5010
MH
949 /* Accept one wildcard as a full refname component. */
950 flags &= ~REFNAME_REFSPEC_PATTERN;
49295d4e
MH
951 component_len = 1;
952 } else {
8d9c5010 953 return -1;
49295d4e 954 }
03feddd6 955 }
49295d4e
MH
956 component_count++;
957 if (ref[component_len] == '\0')
958 break;
959 /* Skip to next component. */
960 ref += component_len + 1;
03feddd6 961 }
49295d4e
MH
962
963 if (ref[component_len - 1] == '.')
964 return -1; /* Refname ends with '.'. */
49295d4e
MH
965 if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2)
966 return -1; /* Refname has only one component. */
967 return 0;
95fc7512
DB
968}
969
4577e483 970const char *prettify_refname(const char *name)
a9c37a72 971{
a9c37a72
DB
972 return name + (
973 !prefixcmp(name, "refs/heads/") ? 11 :
974 !prefixcmp(name, "refs/tags/") ? 10 :
975 !prefixcmp(name, "refs/remotes/") ? 13 :
976 0);
977}
978
79803322
SP
979const char *ref_rev_parse_rules[] = {
980 "%.*s",
981 "refs/%.*s",
982 "refs/tags/%.*s",
983 "refs/heads/%.*s",
984 "refs/remotes/%.*s",
985 "refs/remotes/%.*s/HEAD",
986 NULL
987};
988
605b4978
SP
989const char *ref_fetch_rules[] = {
990 "%.*s",
991 "refs/%.*s",
992 "refs/heads/%.*s",
993 NULL
994};
995
79803322
SP
996int refname_match(const char *abbrev_name, const char *full_name, const char **rules)
997{
998 const char **p;
999 const int abbrev_name_len = strlen(abbrev_name);
1000
1001 for (p = rules; *p; p++) {
1002 if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
1003 return 1;
1004 }
1005 }
1006
1007 return 0;
1008}
1009
e5f38ec3 1010static struct ref_lock *verify_lock(struct ref_lock *lock,
4bd18c43
SP
1011 const unsigned char *old_sha1, int mustexist)
1012{
8da19775 1013 if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
434cd0cd 1014 error("Can't verify ref %s", lock->ref_name);
4bd18c43
SP
1015 unlock_ref(lock);
1016 return NULL;
1017 }
a89fccd2 1018 if (hashcmp(lock->old_sha1, old_sha1)) {
434cd0cd 1019 error("Ref %s is at %s but expected %s", lock->ref_name,
4bd18c43
SP
1020 sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
1021 unlock_ref(lock);
1022 return NULL;
1023 }
1024 return lock;
1025}
1026
7155b727 1027static int remove_empty_directories(const char *file)
bc7127ef
JH
1028{
1029 /* we want to create a file but there is a directory there;
1030 * if that is an empty directory (or a directory that contains
1031 * only empty directories), remove them.
1032 */
7155b727
JS
1033 struct strbuf path;
1034 int result;
bc7127ef 1035
7155b727
JS
1036 strbuf_init(&path, 20);
1037 strbuf_addstr(&path, file);
1038
a0f4afbe 1039 result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY);
7155b727
JS
1040
1041 strbuf_release(&path);
1042
1043 return result;
bc7127ef
JH
1044}
1045
c976d415
LH
1046static int is_refname_available(const char *ref, const char *oldref,
1047 struct ref_list *list, int quiet)
1048{
1049 int namlen = strlen(ref); /* e.g. 'foo/bar' */
1050 while (list) {
1051 /* list->name could be 'foo' or 'foo/bar/baz' */
1052 if (!oldref || strcmp(oldref, list->name)) {
1053 int len = strlen(list->name);
1054 int cmplen = (namlen < len) ? namlen : len;
1055 const char *lead = (namlen < len) ? list->name : ref;
1056 if (!strncmp(ref, list->name, cmplen) &&
1057 lead[cmplen] == '/') {
1058 if (!quiet)
1059 error("'%s' exists; cannot create '%s'",
1060 list->name, ref);
1061 return 0;
1062 }
1063 }
1064 list = list->next;
1065 }
1066 return 1;
1067}
1068
ff74f7f1
JH
1069/*
1070 * *string and *len will only be substituted, and *string returned (for
1071 * later free()ing) if the string passed in is a magic short-hand form
1072 * to name a branch.
1073 */
1074static char *substitute_branch_name(const char **string, int *len)
1075{
1076 struct strbuf buf = STRBUF_INIT;
1077 int ret = interpret_branch_name(*string, &buf);
1078
1079 if (ret == *len) {
1080 size_t size;
1081 *string = strbuf_detach(&buf, &size);
1082 *len = size;
1083 return (char *)*string;
1084 }
1085
1086 return NULL;
1087}
1088
1089int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
1090{
1091 char *last_branch = substitute_branch_name(&str, &len);
1092 const char **p, *r;
1093 int refs_found = 0;
1094
1095 *ref = NULL;
1096 for (p = ref_rev_parse_rules; *p; p++) {
1097 char fullref[PATH_MAX];
1098 unsigned char sha1_from_ref[20];
1099 unsigned char *this_result;
1100 int flag;
1101
1102 this_result = refs_found ? sha1_from_ref : sha1;
1103 mksnpath(fullref, sizeof(fullref), *p, len, str);
1104 r = resolve_ref(fullref, this_result, 1, &flag);
1105 if (r) {
1106 if (!refs_found++)
1107 *ref = xstrdup(r);
1108 if (!warn_ambiguous_refs)
1109 break;
1110 } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD"))
1111 warning("ignoring dangling symref %s.", fullref);
1112 }
1113 free(last_branch);
1114 return refs_found;
1115}
1116
1117int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
1118{
1119 char *last_branch = substitute_branch_name(&str, &len);
1120 const char **p;
1121 int logs_found = 0;
1122
1123 *log = NULL;
1124 for (p = ref_rev_parse_rules; *p; p++) {
1125 struct stat st;
1126 unsigned char hash[20];
1127 char path[PATH_MAX];
1128 const char *ref, *it;
1129
1130 mksnpath(path, sizeof(path), *p, len, str);
1131 ref = resolve_ref(path, hash, 1, NULL);
1132 if (!ref)
1133 continue;
1134 if (!stat(git_path("logs/%s", path), &st) &&
1135 S_ISREG(st.st_mode))
1136 it = path;
1137 else if (strcmp(ref, path) &&
1138 !stat(git_path("logs/%s", ref), &st) &&
1139 S_ISREG(st.st_mode))
1140 it = ref;
1141 else
1142 continue;
1143 if (!logs_found++) {
1144 *log = xstrdup(it);
1145 hashcpy(sha1, hash);
1146 }
1147 if (!warn_ambiguous_refs)
1148 break;
1149 }
1150 free(last_branch);
1151 return logs_found;
1152}
1153
68db31cc 1154static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p)
4bd18c43 1155{
434cd0cd 1156 char *ref_file;
ed378ec7 1157 const char *orig_ref = ref;
4bd18c43 1158 struct ref_lock *lock;
5cc3cef9 1159 int last_errno = 0;
acd3b9ec 1160 int type, lflags;
4431fcc4 1161 int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
5bdd8d4a 1162 int missing = 0;
4bd18c43
SP
1163
1164 lock = xcalloc(1, sizeof(struct ref_lock));
1165 lock->lock_fd = -1;
1166
68db31cc 1167 ref = resolve_ref(ref, lock->old_sha1, mustexist, &type);
bc7127ef
JH
1168 if (!ref && errno == EISDIR) {
1169 /* we are trying to lock foo but we used to
1170 * have foo/bar which now does not exist;
1171 * it is normal for the empty directory 'foo'
1172 * to remain.
1173 */
1174 ref_file = git_path("%s", orig_ref);
5cc3cef9
JH
1175 if (remove_empty_directories(ref_file)) {
1176 last_errno = errno;
1177 error("there are still refs under '%s'", orig_ref);
1178 goto error_return;
1179 }
68db31cc 1180 ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type);
bc7127ef 1181 }
68db31cc
SV
1182 if (type_p)
1183 *type_p = type;
ed378ec7 1184 if (!ref) {
5cc3cef9 1185 last_errno = errno;
818f477c 1186 error("unable to resolve reference %s: %s",
ed378ec7 1187 orig_ref, strerror(errno));
5cc3cef9 1188 goto error_return;
4bd18c43 1189 }
5bdd8d4a 1190 missing = is_null_sha1(lock->old_sha1);
c976d415
LH
1191 /* When the ref did not exist and we are creating it,
1192 * make sure there is no existing ref that is packed
1193 * whose name begins with our refname, nor a ref whose
1194 * name is a proper prefix of our refname.
1195 */
5bdd8d4a 1196 if (missing &&
0bad611b 1197 !is_refname_available(ref, NULL, get_packed_refs(NULL), 0)) {
f475e08e 1198 last_errno = ENOTDIR;
c976d415 1199 goto error_return;
f475e08e 1200 }
22a3844e 1201
c33d5174 1202 lock->lk = xcalloc(1, sizeof(struct lock_file));
4bd18c43 1203
acd3b9ec
JH
1204 lflags = LOCK_DIE_ON_ERROR;
1205 if (flags & REF_NODEREF) {
68db31cc 1206 ref = orig_ref;
acd3b9ec
JH
1207 lflags |= LOCK_NODEREF;
1208 }
434cd0cd 1209 lock->ref_name = xstrdup(ref);
1655707c 1210 lock->orig_ref_name = xstrdup(orig_ref);
7c1a278d 1211 ref_file = git_path("%s", ref);
5bdd8d4a 1212 if (missing)
68db31cc
SV
1213 lock->force_write = 1;
1214 if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
1215 lock->force_write = 1;
4bd18c43 1216
5cc3cef9
JH
1217 if (safe_create_leading_directories(ref_file)) {
1218 last_errno = errno;
1219 error("unable to create directory for %s", ref_file);
1220 goto error_return;
1221 }
4bd18c43 1222
acd3b9ec 1223 lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags);
4bd18c43 1224 return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
5cc3cef9
JH
1225
1226 error_return:
1227 unlock_ref(lock);
1228 errno = last_errno;
1229 return NULL;
4bd18c43
SP
1230}
1231
4431fcc4 1232struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1)
95fc7512 1233{
53cce84c 1234 char refpath[PATH_MAX];
8d9c5010 1235 if (check_refname_format(ref, 0))
4bd18c43 1236 return NULL;
53cce84c 1237 strcpy(refpath, mkpath("refs/%s", ref));
68db31cc 1238 return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
4bd18c43
SP
1239}
1240
68db31cc 1241struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags)
4bd18c43 1242{
8d9c5010 1243 if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL))
257f3020 1244 return NULL;
8d9c5010 1245 return lock_ref_sha1_basic(ref, old_sha1, flags, NULL);
c0277d15
JH
1246}
1247
26a063a1
JH
1248static struct lock_file packlock;
1249
c0277d15
JH
1250static int repack_without_ref(const char *refname)
1251{
1252 struct ref_list *list, *packed_ref_list;
1253 int fd;
1254 int found = 0;
c0277d15 1255
0bad611b 1256 packed_ref_list = get_packed_refs(NULL);
c0277d15
JH
1257 for (list = packed_ref_list; list; list = list->next) {
1258 if (!strcmp(refname, list->name)) {
1259 found = 1;
1260 break;
1261 }
1262 }
1263 if (!found)
1264 return 0;
c0277d15 1265 fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
1b018fd9
MV
1266 if (fd < 0) {
1267 unable_to_lock_error(git_path("packed-refs"), errno);
c0277d15 1268 return error("cannot delete '%s' from packed refs", refname);
1b018fd9 1269 }
c0277d15
JH
1270
1271 for (list = packed_ref_list; list; list = list->next) {
1272 char line[PATH_MAX + 100];
1273 int len;
1274
1275 if (!strcmp(refname, list->name))
1276 continue;
1277 len = snprintf(line, sizeof(line), "%s %s\n",
1278 sha1_to_hex(list->sha1), list->name);
1279 /* this should not happen but just being defensive */
1280 if (len > sizeof(line))
1281 die("too long a refname '%s'", list->name);
1282 write_or_die(fd, line, len);
1283 }
1284 return commit_lock_file(&packlock);
1285}
1286
eca35a25 1287int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
c0277d15
JH
1288{
1289 struct ref_lock *lock;
eca35a25 1290 int err, i = 0, ret = 0, flag = 0;
c0277d15 1291
68db31cc 1292 lock = lock_ref_sha1_basic(refname, sha1, 0, &flag);
c0277d15
JH
1293 if (!lock)
1294 return 1;
045a476f 1295 if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
c0277d15 1296 /* loose */
eca35a25
MV
1297 const char *path;
1298
1299 if (!(delopt & REF_NODEREF)) {
1300 i = strlen(lock->lk->filename) - 5; /* .lock */
1301 lock->lk->filename[i] = 0;
1302 path = lock->lk->filename;
1303 } else {
9db56f71 1304 path = git_path("%s", refname);
eca35a25 1305 }
691f1a28
AR
1306 err = unlink_or_warn(path);
1307 if (err && errno != ENOENT)
c0277d15 1308 ret = 1;
691f1a28 1309
eca35a25
MV
1310 if (!(delopt & REF_NODEREF))
1311 lock->lk->filename[i] = '.';
c0277d15
JH
1312 }
1313 /* removing the loose one could have resurrected an earlier
1314 * packed one. Also, if it was not loose we need to repack
1315 * without it.
1316 */
1317 ret |= repack_without_ref(refname);
1318
691f1a28 1319 unlink_or_warn(git_path("logs/%s", lock->ref_name));
c0277d15
JH
1320 invalidate_cached_refs();
1321 unlock_ref(lock);
1322 return ret;
4bd18c43
SP
1323}
1324
765c2258
PH
1325/*
1326 * People using contrib's git-new-workdir have .git/logs/refs ->
1327 * /some/other/path/.git/logs/refs, and that may live on another device.
1328 *
1329 * IOW, to avoid cross device rename errors, the temporary renamed log must
1330 * live into logs/refs.
1331 */
1332#define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1333
678d0f4c 1334int rename_ref(const char *oldref, const char *newref, const char *logmsg)
c976d415
LH
1335{
1336 static const char renamed_ref[] = "RENAMED-REF";
1337 unsigned char sha1[20], orig_sha1[20];
1338 int flag = 0, logmoved = 0;
1339 struct ref_lock *lock;
c976d415 1340 struct stat loginfo;
16c2bfbb 1341 int log = !lstat(git_path("logs/%s", oldref), &loginfo);
eca35a25 1342 const char *symref = NULL;
c976d415 1343
450d4c0f 1344 if (log && S_ISLNK(loginfo.st_mode))
c976d415
LH
1345 return error("reflog for %s is a symlink", oldref);
1346
eca35a25
MV
1347 symref = resolve_ref(oldref, orig_sha1, 1, &flag);
1348 if (flag & REF_ISSYMREF)
fa58186c
MV
1349 return error("refname %s is a symbolic ref, renaming it is not supported",
1350 oldref);
eca35a25 1351 if (!symref)
c976d415
LH
1352 return error("refname %s not found", oldref);
1353
0bad611b 1354 if (!is_refname_available(newref, oldref, get_packed_refs(NULL), 0))
c976d415
LH
1355 return 1;
1356
0bad611b 1357 if (!is_refname_available(newref, oldref, get_loose_refs(NULL), 0))
c976d415
LH
1358 return 1;
1359
68db31cc 1360 lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL);
c976d415
LH
1361 if (!lock)
1362 return error("unable to lock %s", renamed_ref);
1363 lock->force_write = 1;
678d0f4c 1364 if (write_ref_sha1(lock, orig_sha1, logmsg))
c976d415
LH
1365 return error("unable to save current sha1 in %s", renamed_ref);
1366
765c2258
PH
1367 if (log && rename(git_path("logs/%s", oldref), git_path(TMP_RENAMED_LOG)))
1368 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
c976d415
LH
1369 oldref, strerror(errno));
1370
eca35a25 1371 if (delete_ref(oldref, orig_sha1, REF_NODEREF)) {
c976d415
LH
1372 error("unable to delete old %s", oldref);
1373 goto rollback;
1374 }
1375
eca35a25 1376 if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1, REF_NODEREF)) {
c976d415
LH
1377 if (errno==EISDIR) {
1378 if (remove_empty_directories(git_path("%s", newref))) {
1379 error("Directory not empty: %s", newref);
1380 goto rollback;
1381 }
1382 } else {
1383 error("unable to delete existing %s", newref);
1384 goto rollback;
1385 }
1386 }
1387
1388 if (log && safe_create_leading_directories(git_path("logs/%s", newref))) {
1389 error("unable to create directory for %s", newref);
1390 goto rollback;
1391 }
1392
1393 retry:
765c2258 1394 if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newref))) {
d9e74d57
JR
1395 if (errno==EISDIR || errno==ENOTDIR) {
1396 /*
1397 * rename(a, b) when b is an existing
1398 * directory ought to result in ISDIR, but
1399 * Solaris 5.8 gives ENOTDIR. Sheesh.
1400 */
c976d415
LH
1401 if (remove_empty_directories(git_path("logs/%s", newref))) {
1402 error("Directory not empty: logs/%s", newref);
1403 goto rollback;
1404 }
1405 goto retry;
1406 } else {
765c2258 1407 error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
c976d415
LH
1408 newref, strerror(errno));
1409 goto rollback;
1410 }
1411 }
1412 logmoved = log;
1413
68db31cc 1414 lock = lock_ref_sha1_basic(newref, NULL, 0, NULL);
c976d415
LH
1415 if (!lock) {
1416 error("unable to lock %s for update", newref);
1417 goto rollback;
1418 }
c976d415
LH
1419 lock->force_write = 1;
1420 hashcpy(lock->old_sha1, orig_sha1);
678d0f4c 1421 if (write_ref_sha1(lock, orig_sha1, logmsg)) {
c976d415
LH
1422 error("unable to write current sha1 into %s", newref);
1423 goto rollback;
1424 }
1425
1426 return 0;
1427
1428 rollback:
68db31cc 1429 lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL);
c976d415
LH
1430 if (!lock) {
1431 error("unable to lock %s for rollback", oldref);
1432 goto rollbacklog;
1433 }
1434
1435 lock->force_write = 1;
1436 flag = log_all_ref_updates;
1437 log_all_ref_updates = 0;
1438 if (write_ref_sha1(lock, orig_sha1, NULL))
1439 error("unable to write current sha1 into %s", oldref);
1440 log_all_ref_updates = flag;
1441
1442 rollbacklog:
1443 if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref)))
1444 error("unable to restore logfile %s from %s: %s",
1445 oldref, newref, strerror(errno));
1446 if (!logmoved && log &&
765c2258
PH
1447 rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldref)))
1448 error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s",
c976d415
LH
1449 oldref, strerror(errno));
1450
1451 return 1;
1452}
1453
435fc852 1454int close_ref(struct ref_lock *lock)
b531394d
BC
1455{
1456 if (close_lock_file(lock->lk))
1457 return -1;
1458 lock->lock_fd = -1;
1459 return 0;
1460}
1461
435fc852 1462int commit_ref(struct ref_lock *lock)
b531394d
BC
1463{
1464 if (commit_lock_file(lock->lk))
1465 return -1;
1466 lock->lock_fd = -1;
1467 return 0;
1468}
1469
e5f38ec3 1470void unlock_ref(struct ref_lock *lock)
4bd18c43 1471{
4ed7cd3a
BC
1472 /* Do not free lock->lk -- atexit() still looks at them */
1473 if (lock->lk)
1474 rollback_lock_file(lock->lk);
434cd0cd 1475 free(lock->ref_name);
1655707c 1476 free(lock->orig_ref_name);
4bd18c43
SP
1477 free(lock);
1478}
1479
0ec29a47
JH
1480/*
1481 * copy the reflog message msg to buf, which has been allocated sufficiently
1482 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1483 * because reflog file is one line per entry.
1484 */
1485static int copy_msg(char *buf, const char *msg)
1486{
1487 char *cp = buf;
1488 char c;
1489 int wasspace = 1;
1490
1491 *cp++ = '\t';
1492 while ((c = *msg++)) {
1493 if (wasspace && isspace(c))
1494 continue;
1495 wasspace = isspace(c);
1496 if (wasspace)
1497 c = ' ';
1498 *cp++ = c;
1499 }
1500 while (buf < cp && isspace(cp[-1]))
1501 cp--;
1502 *cp++ = '\n';
1503 return cp - buf;
1504}
1505
157aaea5 1506int log_ref_setup(const char *ref_name, char *logfile, int bufsize)
6de08ae6 1507{
859c3017 1508 int logfd, oflags = O_APPEND | O_WRONLY;
9a13f0b7 1509
157aaea5 1510 git_snpath(logfile, bufsize, "logs/%s", ref_name);
4057deb5 1511 if (log_all_ref_updates &&
cc44c765
JH
1512 (!prefixcmp(ref_name, "refs/heads/") ||
1513 !prefixcmp(ref_name, "refs/remotes/") ||
b2e256b0 1514 !prefixcmp(ref_name, "refs/notes/") ||
bd104db1 1515 !strcmp(ref_name, "HEAD"))) {
157aaea5 1516 if (safe_create_leading_directories(logfile) < 0)
6de08ae6 1517 return error("unable to create directory for %s",
157aaea5 1518 logfile);
6de08ae6
SP
1519 oflags |= O_CREAT;
1520 }
1521
157aaea5 1522 logfd = open(logfile, oflags, 0666);
6de08ae6 1523 if (logfd < 0) {
1974bf62 1524 if (!(oflags & O_CREAT) && errno == ENOENT)
6de08ae6 1525 return 0;
3b463c3f
JH
1526
1527 if ((oflags & O_CREAT) && errno == EISDIR) {
157aaea5 1528 if (remove_empty_directories(logfile)) {
3b463c3f 1529 return error("There are still logs under '%s'",
157aaea5 1530 logfile);
3b463c3f 1531 }
157aaea5 1532 logfd = open(logfile, oflags, 0666);
3b463c3f
JH
1533 }
1534
1535 if (logfd < 0)
1536 return error("Unable to append to %s: %s",
157aaea5 1537 logfile, strerror(errno));
6de08ae6
SP
1538 }
1539
157aaea5 1540 adjust_shared_perm(logfile);
859c3017
EM
1541 close(logfd);
1542 return 0;
1543}
443b92b6 1544
859c3017
EM
1545static int log_ref_write(const char *ref_name, const unsigned char *old_sha1,
1546 const unsigned char *new_sha1, const char *msg)
1547{
1548 int logfd, result, written, oflags = O_APPEND | O_WRONLY;
1549 unsigned maxlen, len;
1550 int msglen;
157aaea5 1551 char log_file[PATH_MAX];
859c3017
EM
1552 char *logrec;
1553 const char *committer;
1554
1555 if (log_all_ref_updates < 0)
1556 log_all_ref_updates = !is_bare_repository();
1557
157aaea5 1558 result = log_ref_setup(ref_name, log_file, sizeof(log_file));
859c3017
EM
1559 if (result)
1560 return result;
1561
1562 logfd = open(log_file, oflags);
1563 if (logfd < 0)
1564 return 0;
0ec29a47 1565 msglen = msg ? strlen(msg) : 0;
774751a8 1566 committer = git_committer_info(0);
8ac65937
JH
1567 maxlen = strlen(committer) + msglen + 100;
1568 logrec = xmalloc(maxlen);
1569 len = sprintf(logrec, "%s %s %s\n",
9a13f0b7
NP
1570 sha1_to_hex(old_sha1),
1571 sha1_to_hex(new_sha1),
8ac65937
JH
1572 committer);
1573 if (msglen)
0ec29a47 1574 len += copy_msg(logrec + len - 1, msg) - 1;
93822c22 1575 written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
6de08ae6 1576 free(logrec);
91c8d590 1577 if (close(logfd) != 0 || written != len)
9a13f0b7 1578 return error("Unable to append to %s", log_file);
6de08ae6
SP
1579 return 0;
1580}
1581
c3b0dec5
LT
1582static int is_branch(const char *refname)
1583{
1584 return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
1585}
1586
4bd18c43
SP
1587int write_ref_sha1(struct ref_lock *lock,
1588 const unsigned char *sha1, const char *logmsg)
1589{
1590 static char term = '\n';
c3b0dec5 1591 struct object *o;
4bd18c43
SP
1592
1593 if (!lock)
95fc7512 1594 return -1;
a89fccd2 1595 if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
4bd18c43
SP
1596 unlock_ref(lock);
1597 return 0;
95fc7512 1598 }
c3b0dec5
LT
1599 o = parse_object(sha1);
1600 if (!o) {
7be8b3ba 1601 error("Trying to write ref %s with nonexistent object %s",
c3b0dec5
LT
1602 lock->ref_name, sha1_to_hex(sha1));
1603 unlock_ref(lock);
1604 return -1;
1605 }
1606 if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
1607 error("Trying to write non-commit object %s to branch %s",
1608 sha1_to_hex(sha1), lock->ref_name);
1609 unlock_ref(lock);
1610 return -1;
1611 }
93822c22
AW
1612 if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
1613 write_in_full(lock->lock_fd, &term, 1) != 1
b531394d 1614 || close_ref(lock) < 0) {
c33d5174 1615 error("Couldn't write %s", lock->lk->filename);
4bd18c43
SP
1616 unlock_ref(lock);
1617 return -1;
1618 }
5e290ff7 1619 invalidate_cached_refs();
bd104db1
NP
1620 if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
1621 (strcmp(lock->ref_name, lock->orig_ref_name) &&
1622 log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
6de08ae6
SP
1623 unlock_ref(lock);
1624 return -1;
1625 }
605fac8b
NP
1626 if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
1627 /*
1628 * Special hack: If a branch is updated directly and HEAD
1629 * points to it (may happen on the remote side of a push
1630 * for example) then logically the HEAD reflog should be
1631 * updated too.
1632 * A generic solution implies reverse symref information,
1633 * but finding all symrefs pointing to the given branch
1634 * would be rather costly for this rare event (the direct
1635 * update of a branch) to be worth it. So let's cheat and
1636 * check with HEAD only which should cover 99% of all usage
1637 * scenarios (even 100% of the default ones).
1638 */
1639 unsigned char head_sha1[20];
1640 int head_flag;
1641 const char *head_ref;
1642 head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag);
1643 if (head_ref && (head_flag & REF_ISSYMREF) &&
1644 !strcmp(head_ref, lock->ref_name))
1645 log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
1646 }
b531394d 1647 if (commit_ref(lock)) {
434cd0cd 1648 error("Couldn't set %s", lock->ref_name);
4bd18c43
SP
1649 unlock_ref(lock);
1650 return -1;
1651 }
4bd18c43
SP
1652 unlock_ref(lock);
1653 return 0;
95fc7512 1654}
d556fae2 1655
8b5157e4
NP
1656int create_symref(const char *ref_target, const char *refs_heads_master,
1657 const char *logmsg)
41b625b0
NP
1658{
1659 const char *lockpath;
1660 char ref[1000];
1661 int fd, len, written;
a4f34cbb 1662 char *git_HEAD = git_pathdup("%s", ref_target);
8b5157e4
NP
1663 unsigned char old_sha1[20], new_sha1[20];
1664
1665 if (logmsg && read_ref(ref_target, old_sha1))
1666 hashclr(old_sha1);
41b625b0 1667
d48744d1
JH
1668 if (safe_create_leading_directories(git_HEAD) < 0)
1669 return error("unable to create directory for %s", git_HEAD);
1670
41b625b0
NP
1671#ifndef NO_SYMLINK_HEAD
1672 if (prefer_symlink_refs) {
1673 unlink(git_HEAD);
1674 if (!symlink(refs_heads_master, git_HEAD))
8b5157e4 1675 goto done;
41b625b0
NP
1676 fprintf(stderr, "no symlink - falling back to symbolic ref\n");
1677 }
1678#endif
1679
1680 len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
1681 if (sizeof(ref) <= len) {
1682 error("refname too long: %s", refs_heads_master);
47fc52e2 1683 goto error_free_return;
41b625b0
NP
1684 }
1685 lockpath = mkpath("%s.lock", git_HEAD);
1686 fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
1687 if (fd < 0) {
1688 error("Unable to open %s for writing", lockpath);
47fc52e2 1689 goto error_free_return;
41b625b0
NP
1690 }
1691 written = write_in_full(fd, ref, len);
91c8d590 1692 if (close(fd) != 0 || written != len) {
41b625b0 1693 error("Unable to write to %s", lockpath);
47fc52e2 1694 goto error_unlink_return;
41b625b0
NP
1695 }
1696 if (rename(lockpath, git_HEAD) < 0) {
41b625b0 1697 error("Unable to create %s", git_HEAD);
47fc52e2 1698 goto error_unlink_return;
41b625b0
NP
1699 }
1700 if (adjust_shared_perm(git_HEAD)) {
41b625b0 1701 error("Unable to fix permissions on %s", lockpath);
47fc52e2 1702 error_unlink_return:
691f1a28 1703 unlink_or_warn(lockpath);
47fc52e2
JH
1704 error_free_return:
1705 free(git_HEAD);
1706 return -1;
41b625b0 1707 }
8b5157e4 1708
ee96d11b 1709#ifndef NO_SYMLINK_HEAD
8b5157e4 1710 done:
ee96d11b 1711#endif
8b5157e4
NP
1712 if (logmsg && !read_ref(refs_heads_master, new_sha1))
1713 log_ref_write(ref_target, old_sha1, new_sha1, logmsg);
1714
47fc52e2 1715 free(git_HEAD);
41b625b0
NP
1716 return 0;
1717}
1718
16d7cc90
JH
1719static char *ref_msg(const char *line, const char *endp)
1720{
1721 const char *ep;
16d7cc90 1722 line += 82;
182af834
PH
1723 ep = memchr(line, '\n', endp - line);
1724 if (!ep)
1725 ep = endp;
1726 return xmemdupz(line, ep - line);
16d7cc90
JH
1727}
1728
1729int 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 1730{
e5229042 1731 const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
d556fae2 1732 char *tz_c;
e29cb53a 1733 int logfd, tz, reccnt = 0;
d556fae2
SP
1734 struct stat st;
1735 unsigned long date;
e5229042 1736 unsigned char logged_sha1[20];
cb48cb58 1737 void *log_mapped;
dc49cd76 1738 size_t mapsz;
d556fae2
SP
1739
1740 logfile = git_path("logs/%s", ref);
1741 logfd = open(logfile, O_RDONLY, 0);
1742 if (logfd < 0)
d824cbba 1743 die_errno("Unable to read log '%s'", logfile);
d556fae2
SP
1744 fstat(logfd, &st);
1745 if (!st.st_size)
1746 die("Log %s is empty.", logfile);
dc49cd76
SP
1747 mapsz = xsize_t(st.st_size);
1748 log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0);
cb48cb58 1749 logdata = log_mapped;
d556fae2
SP
1750 close(logfd);
1751
e5229042 1752 lastrec = NULL;
d556fae2
SP
1753 rec = logend = logdata + st.st_size;
1754 while (logdata < rec) {
e29cb53a 1755 reccnt++;
d556fae2
SP
1756 if (logdata < rec && *(rec-1) == '\n')
1757 rec--;
e5229042
SP
1758 lastgt = NULL;
1759 while (logdata < rec && *(rec-1) != '\n') {
d556fae2 1760 rec--;
e5229042
SP
1761 if (*rec == '>')
1762 lastgt = rec;
1763 }
1764 if (!lastgt)
d556fae2 1765 die("Log %s is corrupt.", logfile);
e5229042 1766 date = strtoul(lastgt + 1, &tz_c, 10);
ab2a1a32 1767 if (date <= at_time || cnt == 0) {
76a44c5c 1768 tz = strtoul(tz_c, NULL, 10);
16d7cc90
JH
1769 if (msg)
1770 *msg = ref_msg(rec, logend);
1771 if (cutoff_time)
1772 *cutoff_time = date;
1773 if (cutoff_tz)
1774 *cutoff_tz = tz;
1775 if (cutoff_cnt)
76a44c5c 1776 *cutoff_cnt = reccnt - 1;
e5229042
SP
1777 if (lastrec) {
1778 if (get_sha1_hex(lastrec, logged_sha1))
1779 die("Log %s is corrupt.", logfile);
1780 if (get_sha1_hex(rec + 41, sha1))
1781 die("Log %s is corrupt.", logfile);
a89fccd2 1782 if (hashcmp(logged_sha1, sha1)) {
edbc25c5 1783 warning("Log %s has gap after %s.",
73013afd 1784 logfile, show_date(date, tz, DATE_RFC2822));
e5229042 1785 }
e5f38ec3
JH
1786 }
1787 else if (date == at_time) {
e5229042
SP
1788 if (get_sha1_hex(rec + 41, sha1))
1789 die("Log %s is corrupt.", logfile);
e5f38ec3
JH
1790 }
1791 else {
e5229042
SP
1792 if (get_sha1_hex(rec + 41, logged_sha1))
1793 die("Log %s is corrupt.", logfile);
a89fccd2 1794 if (hashcmp(logged_sha1, sha1)) {
edbc25c5 1795 warning("Log %s unexpectedly ended on %s.",
73013afd 1796 logfile, show_date(date, tz, DATE_RFC2822));
e5229042
SP
1797 }
1798 }
dc49cd76 1799 munmap(log_mapped, mapsz);
d556fae2
SP
1800 return 0;
1801 }
e5229042 1802 lastrec = rec;
ab2a1a32
JH
1803 if (cnt > 0)
1804 cnt--;
d556fae2
SP
1805 }
1806
e5229042
SP
1807 rec = logdata;
1808 while (rec < logend && *rec != '>' && *rec != '\n')
1809 rec++;
1810 if (rec == logend || *rec == '\n')
d556fae2 1811 die("Log %s is corrupt.", logfile);
e5229042 1812 date = strtoul(rec + 1, &tz_c, 10);
d556fae2
SP
1813 tz = strtoul(tz_c, NULL, 10);
1814 if (get_sha1_hex(logdata, sha1))
1815 die("Log %s is corrupt.", logfile);
d1a4489a
JK
1816 if (is_null_sha1(sha1)) {
1817 if (get_sha1_hex(logdata + 41, sha1))
1818 die("Log %s is corrupt.", logfile);
1819 }
16d7cc90
JH
1820 if (msg)
1821 *msg = ref_msg(logdata, logend);
dc49cd76 1822 munmap(log_mapped, mapsz);
16d7cc90
JH
1823
1824 if (cutoff_time)
1825 *cutoff_time = date;
1826 if (cutoff_tz)
1827 *cutoff_tz = tz;
1828 if (cutoff_cnt)
1829 *cutoff_cnt = reccnt;
1830 return 1;
d556fae2 1831}
2ff81662 1832
101d15e0 1833int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long ofs, void *cb_data)
2ff81662
JH
1834{
1835 const char *logfile;
1836 FILE *logfp;
8ca78803 1837 struct strbuf sb = STRBUF_INIT;
2266bf27 1838 int ret = 0;
2ff81662
JH
1839
1840 logfile = git_path("logs/%s", ref);
1841 logfp = fopen(logfile, "r");
1842 if (!logfp)
883d60fa 1843 return -1;
101d15e0
JH
1844
1845 if (ofs) {
1846 struct stat statbuf;
1847 if (fstat(fileno(logfp), &statbuf) ||
1848 statbuf.st_size < ofs ||
1849 fseek(logfp, -ofs, SEEK_END) ||
8ca78803 1850 strbuf_getwholeline(&sb, logfp, '\n')) {
9d33f7c2 1851 fclose(logfp);
8ca78803 1852 strbuf_release(&sb);
101d15e0 1853 return -1;
9d33f7c2 1854 }
101d15e0
JH
1855 }
1856
8ca78803 1857 while (!strbuf_getwholeline(&sb, logfp, '\n')) {
2ff81662 1858 unsigned char osha1[20], nsha1[20];
883d60fa
JS
1859 char *email_end, *message;
1860 unsigned long timestamp;
8ca78803 1861 int tz;
2ff81662
JH
1862
1863 /* old SP new SP name <email> SP time TAB msg LF */
8ca78803
RS
1864 if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' ||
1865 get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' ||
1866 get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' ||
1867 !(email_end = strchr(sb.buf + 82, '>')) ||
883d60fa
JS
1868 email_end[1] != ' ' ||
1869 !(timestamp = strtoul(email_end + 2, &message, 10)) ||
1870 !message || message[0] != ' ' ||
1871 (message[1] != '+' && message[1] != '-') ||
1872 !isdigit(message[2]) || !isdigit(message[3]) ||
b4dd4856 1873 !isdigit(message[4]) || !isdigit(message[5]))
2ff81662 1874 continue; /* corrupt? */
883d60fa
JS
1875 email_end[1] = '\0';
1876 tz = strtol(message + 1, NULL, 10);
b4dd4856
JS
1877 if (message[6] != '\t')
1878 message += 6;
1879 else
1880 message += 7;
8ca78803
RS
1881 ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message,
1882 cb_data);
883d60fa 1883 if (ret)
2266bf27 1884 break;
2ff81662
JH
1885 }
1886 fclose(logfp);
8ca78803 1887 strbuf_release(&sb);
2266bf27 1888 return ret;
2ff81662 1889}
e29cb53a 1890
101d15e0
JH
1891int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data)
1892{
1893 return for_each_recent_reflog_ent(ref, fn, 0, cb_data);
1894}
1895
eb8381c8
NP
1896static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data)
1897{
1898 DIR *dir = opendir(git_path("logs/%s", base));
fcee5a14 1899 int retval = 0;
eb8381c8
NP
1900
1901 if (dir) {
1902 struct dirent *de;
1903 int baselen = strlen(base);
1904 char *log = xmalloc(baselen + 257);
1905
1906 memcpy(log, base, baselen);
1907 if (baselen && base[baselen-1] != '/')
1908 log[baselen++] = '/';
1909
1910 while ((de = readdir(dir)) != NULL) {
1911 struct stat st;
1912 int namelen;
1913
1914 if (de->d_name[0] == '.')
1915 continue;
1916 namelen = strlen(de->d_name);
1917 if (namelen > 255)
1918 continue;
1919 if (has_extension(de->d_name, ".lock"))
1920 continue;
1921 memcpy(log + baselen, de->d_name, namelen+1);
1922 if (stat(git_path("logs/%s", log), &st) < 0)
1923 continue;
1924 if (S_ISDIR(st.st_mode)) {
1925 retval = do_for_each_reflog(log, fn, cb_data);
1926 } else {
1927 unsigned char sha1[20];
1928 if (!resolve_ref(log, sha1, 0, NULL))
1929 retval = error("bad ref for %s", log);
1930 else
1931 retval = fn(log, sha1, 0, cb_data);
1932 }
1933 if (retval)
1934 break;
1935 }
1936 free(log);
1937 closedir(dir);
1938 }
acb39f64 1939 else if (*base)
fcee5a14 1940 return errno;
eb8381c8
NP
1941 return retval;
1942}
1943
1944int for_each_reflog(each_ref_fn fn, void *cb_data)
1945{
1946 return do_for_each_reflog("", fn, cb_data);
1947}
3d9f037c
CR
1948
1949int update_ref(const char *action, const char *refname,
1950 const unsigned char *sha1, const unsigned char *oldval,
1951 int flags, enum action_on_err onerr)
1952{
1953 static struct ref_lock *lock;
1954 lock = lock_any_ref_for_update(refname, oldval, flags);
1955 if (!lock) {
1956 const char *str = "Cannot lock the ref '%s'.";
1957 switch (onerr) {
1958 case MSG_ON_ERR: error(str, refname); break;
1959 case DIE_ON_ERR: die(str, refname); break;
1960 case QUIET_ON_ERR: break;
1961 }
1962 return 1;
1963 }
1964 if (write_ref_sha1(lock, sha1, action) < 0) {
1965 const char *str = "Cannot update the ref '%s'.";
1966 switch (onerr) {
1967 case MSG_ON_ERR: error(str, refname); break;
1968 case DIE_ON_ERR: die(str, refname); break;
1969 case QUIET_ON_ERR: break;
1970 }
1971 return 1;
1972 }
1973 return 0;
1974}
cda69f48 1975
c17b2294
JH
1976int ref_exists(char *refname)
1977{
1978 unsigned char sha1[20];
1979 return !!resolve_ref(refname, sha1, 1, NULL);
1980}
1981
5483f799 1982struct ref *find_ref_by_name(const struct ref *list, const char *name)
cda69f48
JK
1983{
1984 for ( ; list; list = list->next)
1985 if (!strcmp(list->name, name))
5483f799 1986 return (struct ref *)list;
cda69f48
JK
1987 return NULL;
1988}
7c2b3029
JK
1989
1990/*
1991 * generate a format suitable for scanf from a ref_rev_parse_rules
1992 * rule, that is replace the "%.*s" spec with a "%s" spec
1993 */
1994static void gen_scanf_fmt(char *scanf_fmt, const char *rule)
1995{
1996 char *spec;
1997
1998 spec = strstr(rule, "%.*s");
1999 if (!spec || strstr(spec + 4, "%.*s"))
2000 die("invalid rule in ref_rev_parse_rules: %s", rule);
2001
2002 /* copy all until spec */
2003 strncpy(scanf_fmt, rule, spec - rule);
2004 scanf_fmt[spec - rule] = '\0';
2005 /* copy new spec */
2006 strcat(scanf_fmt, "%s");
2007 /* copy remaining rule */
2008 strcat(scanf_fmt, spec + 4);
2009
2010 return;
2011}
2012
6e7b3309 2013char *shorten_unambiguous_ref(const char *ref, int strict)
7c2b3029
JK
2014{
2015 int i;
2016 static char **scanf_fmts;
2017 static int nr_rules;
2018 char *short_name;
2019
2020 /* pre generate scanf formats from ref_rev_parse_rules[] */
2021 if (!nr_rules) {
2022 size_t total_len = 0;
2023
2024 /* the rule list is NULL terminated, count them first */
2025 for (; ref_rev_parse_rules[nr_rules]; nr_rules++)
2026 /* no +1 because strlen("%s") < strlen("%.*s") */
2027 total_len += strlen(ref_rev_parse_rules[nr_rules]);
2028
2029 scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len);
2030
2031 total_len = 0;
2032 for (i = 0; i < nr_rules; i++) {
2033 scanf_fmts[i] = (char *)&scanf_fmts[nr_rules]
2034 + total_len;
2035 gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]);
2036 total_len += strlen(ref_rev_parse_rules[i]);
2037 }
2038 }
2039
2040 /* bail out if there are no rules */
2041 if (!nr_rules)
2042 return xstrdup(ref);
2043
2044 /* buffer for scanf result, at most ref must fit */
2045 short_name = xstrdup(ref);
2046
2047 /* skip first rule, it will always match */
2048 for (i = nr_rules - 1; i > 0 ; --i) {
2049 int j;
6e7b3309 2050 int rules_to_fail = i;
7c2b3029
JK
2051 int short_name_len;
2052
2053 if (1 != sscanf(ref, scanf_fmts[i], short_name))
2054 continue;
2055
2056 short_name_len = strlen(short_name);
2057
6e7b3309
BW
2058 /*
2059 * in strict mode, all (except the matched one) rules
2060 * must fail to resolve to a valid non-ambiguous ref
2061 */
2062 if (strict)
2063 rules_to_fail = nr_rules;
2064
7c2b3029
JK
2065 /*
2066 * check if the short name resolves to a valid ref,
2067 * but use only rules prior to the matched one
2068 */
6e7b3309 2069 for (j = 0; j < rules_to_fail; j++) {
7c2b3029
JK
2070 const char *rule = ref_rev_parse_rules[j];
2071 unsigned char short_objectname[20];
2072 char refname[PATH_MAX];
2073
6e7b3309
BW
2074 /* skip matched rule */
2075 if (i == j)
2076 continue;
2077
7c2b3029
JK
2078 /*
2079 * the short name is ambiguous, if it resolves
2080 * (with this previous rule) to a valid ref
2081 * read_ref() returns 0 on success
2082 */
2083 mksnpath(refname, sizeof(refname),
2084 rule, short_name_len, short_name);
2085 if (!read_ref(refname, short_objectname))
2086 break;
2087 }
2088
2089 /*
2090 * short name is non-ambiguous if all previous rules
2091 * haven't resolved to a valid ref
2092 */
6e7b3309 2093 if (j == rules_to_fail)
7c2b3029
JK
2094 return short_name;
2095 }
2096
2097 free(short_name);
2098 return xstrdup(ref);
2099}