t/Makefile: remove test artifacts upon "make clean"
[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 161
e142a3c6
DB
162static struct ref_list *extra_refs;
163
5e290ff7
JH
164static void free_ref_list(struct ref_list *list)
165{
166 struct ref_list *next;
167 for ( ; list; list = next) {
168 next = list->next;
169 free(list);
170 }
171}
172
173static void invalidate_cached_refs(void)
e1e22e37 174{
5e290ff7
JH
175 struct cached_refs *ca = &cached_refs;
176
177 if (ca->did_loose && ca->loose)
178 free_ref_list(ca->loose);
179 if (ca->did_packed && ca->packed)
180 free_ref_list(ca->packed);
181 ca->loose = ca->packed = NULL;
182 ca->did_loose = ca->did_packed = 0;
183}
e1e22e37 184
f4204ab9
JH
185static void read_packed_refs(FILE *f, struct cached_refs *cached_refs)
186{
187 struct ref_list *list = NULL;
188 struct ref_list *last = NULL;
189 char refline[PATH_MAX];
190 int flag = REF_ISPACKED;
191
192 while (fgets(refline, sizeof(refline), f)) {
193 unsigned char sha1[20];
194 const char *name;
195 static const char header[] = "# pack-refs with:";
196
197 if (!strncmp(refline, header, sizeof(header)-1)) {
198 const char *traits = refline + sizeof(header) - 1;
199 if (strstr(traits, " peeled "))
200 flag |= REF_KNOWS_PEELED;
201 /* perhaps other traits later as well */
202 continue;
203 }
204
205 name = parse_ref_line(refline, sha1);
206 if (name) {
207 list = add_ref(name, sha1, flag, list, &last);
208 continue;
209 }
210 if (last &&
211 refline[0] == '^' &&
212 strlen(refline) == 42 &&
213 refline[41] == '\n' &&
214 !get_sha1_hex(refline + 1, sha1))
215 hashcpy(last->peeled, sha1);
216 }
c774aab9 217 cached_refs->packed = sort_ref_list(list);
f4204ab9
JH
218}
219
e142a3c6
DB
220void add_extra_ref(const char *name, const unsigned char *sha1, int flag)
221{
222 extra_refs = add_ref(name, sha1, flag, extra_refs, NULL);
223}
224
225void clear_extra_refs(void)
226{
227 free_ref_list(extra_refs);
228 extra_refs = NULL;
229}
230
5e290ff7
JH
231static struct ref_list *get_packed_refs(void)
232{
233 if (!cached_refs.did_packed) {
e1e22e37 234 FILE *f = fopen(git_path("packed-refs"), "r");
f4204ab9 235 cached_refs.packed = NULL;
e1e22e37 236 if (f) {
f4204ab9 237 read_packed_refs(f, &cached_refs);
e1e22e37 238 fclose(f);
e1e22e37 239 }
5e290ff7 240 cached_refs.did_packed = 1;
e1e22e37 241 }
5e290ff7 242 return cached_refs.packed;
e1e22e37
LT
243}
244
245static struct ref_list *get_ref_dir(const char *base, struct ref_list *list)
246{
247 DIR *dir = opendir(git_path("%s", base));
248
249 if (dir) {
250 struct dirent *de;
251 int baselen = strlen(base);
ed378ec7 252 char *ref = xmalloc(baselen + 257);
e1e22e37 253
ed378ec7 254 memcpy(ref, base, baselen);
e1e22e37 255 if (baselen && base[baselen-1] != '/')
ed378ec7 256 ref[baselen++] = '/';
e1e22e37
LT
257
258 while ((de = readdir(dir)) != NULL) {
259 unsigned char sha1[20];
260 struct stat st;
8da19775 261 int flag;
e1e22e37
LT
262 int namelen;
263
264 if (de->d_name[0] == '.')
265 continue;
266 namelen = strlen(de->d_name);
267 if (namelen > 255)
268 continue;
269 if (has_extension(de->d_name, ".lock"))
270 continue;
ed378ec7
LT
271 memcpy(ref + baselen, de->d_name, namelen+1);
272 if (stat(git_path("%s", ref), &st) < 0)
e1e22e37
LT
273 continue;
274 if (S_ISDIR(st.st_mode)) {
ed378ec7 275 list = get_ref_dir(ref, list);
e1e22e37
LT
276 continue;
277 }
f8948e2f
JH
278 if (!resolve_ref(ref, sha1, 1, &flag))
279 hashclr(sha1);
f4204ab9 280 list = add_ref(ref, sha1, flag, list, NULL);
e1e22e37 281 }
ed378ec7 282 free(ref);
e1e22e37
LT
283 closedir(dir);
284 }
c774aab9 285 return sort_ref_list(list);
e1e22e37
LT
286}
287
f8948e2f 288struct warn_if_dangling_data {
3cf6134a 289 FILE *fp;
f8948e2f
JH
290 const char *refname;
291 const char *msg_fmt;
292};
293
294static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1,
295 int flags, void *cb_data)
296{
297 struct warn_if_dangling_data *d = cb_data;
298 const char *resolves_to;
299 unsigned char junk[20];
300
301 if (!(flags & REF_ISSYMREF))
302 return 0;
303
304 resolves_to = resolve_ref(refname, junk, 0, NULL);
305 if (!resolves_to || strcmp(resolves_to, d->refname))
306 return 0;
307
3cf6134a 308 fprintf(d->fp, d->msg_fmt, refname);
f8948e2f
JH
309 return 0;
310}
311
3cf6134a 312void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
f8948e2f 313{
3cf6134a 314 struct warn_if_dangling_data data = { fp, refname, msg_fmt };
f8948e2f
JH
315 for_each_rawref(warn_if_dangling_symref, &data);
316}
317
e1e22e37
LT
318static struct ref_list *get_loose_refs(void)
319{
5e290ff7
JH
320 if (!cached_refs.did_loose) {
321 cached_refs.loose = get_ref_dir("refs", NULL);
322 cached_refs.did_loose = 1;
e1e22e37 323 }
5e290ff7 324 return cached_refs.loose;
e1e22e37
LT
325}
326
ca8db142
LT
327/* We allow "recursive" symbolic refs. Only within reason, though */
328#define MAXDEPTH 5
0ebde32c
LT
329#define MAXREFLEN (1024)
330
331static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result)
332{
333 FILE *f;
334 struct cached_refs refs;
335 struct ref_list *ref;
336 int retval;
337
338 strcpy(name + pathlen, "packed-refs");
339 f = fopen(name, "r");
340 if (!f)
341 return -1;
342 read_packed_refs(f, &refs);
343 fclose(f);
344 ref = refs.packed;
345 retval = -1;
346 while (ref) {
347 if (!strcmp(ref->name, refname)) {
348 retval = 0;
349 memcpy(result, ref->sha1, 20);
350 break;
351 }
352 ref = ref->next;
353 }
354 free_ref_list(refs.packed);
355 return retval;
356}
357
358static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion)
359{
360 int fd, len = strlen(refname);
361 char buffer[128], *p;
362
363 if (recursion > MAXDEPTH || len > MAXREFLEN)
364 return -1;
365 memcpy(name + pathlen, refname, len+1);
366 fd = open(name, O_RDONLY);
367 if (fd < 0)
368 return resolve_gitlink_packed_ref(name, pathlen, refname, result);
369
370 len = read(fd, buffer, sizeof(buffer)-1);
371 close(fd);
372 if (len < 0)
373 return -1;
374 while (len && isspace(buffer[len-1]))
375 len--;
376 buffer[len] = 0;
377
378 /* Was it a detached head or an old-fashioned symlink? */
379 if (!get_sha1_hex(buffer, result))
380 return 0;
381
382 /* Symref? */
383 if (strncmp(buffer, "ref:", 4))
384 return -1;
385 p = buffer + 4;
386 while (isspace(*p))
387 p++;
388
389 return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1);
390}
391
392int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result)
393{
394 int len = strlen(path), retval;
395 char *gitdir;
842abf06 396 const char *tmp;
0ebde32c
LT
397
398 while (len && path[len-1] == '/')
399 len--;
400 if (!len)
401 return -1;
402 gitdir = xmalloc(len + MAXREFLEN + 8);
403 memcpy(gitdir, path, len);
842abf06
LH
404 memcpy(gitdir + len, "/.git", 6);
405 len += 5;
406
407 tmp = read_gitfile_gently(gitdir);
408 if (tmp) {
409 free(gitdir);
410 len = strlen(tmp);
411 gitdir = xmalloc(len + MAXREFLEN + 3);
412 memcpy(gitdir, tmp, len);
413 }
414 gitdir[len] = '/';
415 gitdir[++len] = '\0';
416 retval = resolve_gitlink_ref_recursive(gitdir, len, refname, result, 0);
0ebde32c
LT
417 free(gitdir);
418 return retval;
419}
ca8db142 420
4886b89f
CC
421/*
422 * If the "reading" argument is set, this function finds out what _object_
423 * the ref points at by "reading" the ref. The ref, if it is not symbolic,
424 * has to exist, and if it is symbolic, it has to point at an existing ref,
425 * because the "read" goes through the symref to the ref it points at.
426 *
427 * The access that is not "reading" may often be "writing", but does not
428 * have to; it can be merely checking _where it leads to_. If it is a
429 * prelude to "writing" to the ref, a write to a symref that points at
430 * yet-to-be-born ref will create the real ref pointed by the symref.
431 * reading=0 allows the caller to check where such a symref leads to.
432 */
8da19775 433const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag)
8a65ff76 434{
0104ca09
HO
435 int depth = MAXDEPTH;
436 ssize_t len;
a876ed83 437 char buffer[256];
ed378ec7 438 static char ref_buffer[256];
ca8db142 439
8da19775
JH
440 if (flag)
441 *flag = 0;
442
a876ed83 443 for (;;) {
958a4789 444 char path[PATH_MAX];
a876ed83
JH
445 struct stat st;
446 char *buf;
447 int fd;
8a65ff76 448
a876ed83
JH
449 if (--depth < 0)
450 return NULL;
ca8db142 451
958a4789 452 git_snpath(path, sizeof(path), "%s", ref);
4886b89f 453 /* Special case: non-existing file. */
a876ed83 454 if (lstat(path, &st) < 0) {
434cd0cd
LT
455 struct ref_list *list = get_packed_refs();
456 while (list) {
f4204ab9 457 if (!strcmp(ref, list->name)) {
434cd0cd 458 hashcpy(sha1, list->sha1);
8da19775
JH
459 if (flag)
460 *flag |= REF_ISPACKED;
434cd0cd
LT
461 return ref;
462 }
463 list = list->next;
464 }
a876ed83
JH
465 if (reading || errno != ENOENT)
466 return NULL;
e702496e 467 hashclr(sha1);
ed378ec7 468 return ref;
a876ed83 469 }
ca8db142 470
a876ed83
JH
471 /* Follow "normalized" - ie "refs/.." symlinks by hand */
472 if (S_ISLNK(st.st_mode)) {
473 len = readlink(path, buffer, sizeof(buffer)-1);
474 if (len >= 5 && !memcmp("refs/", buffer, 5)) {
ed378ec7
LT
475 buffer[len] = 0;
476 strcpy(ref_buffer, buffer);
477 ref = ref_buffer;
8da19775
JH
478 if (flag)
479 *flag |= REF_ISSYMREF;
a876ed83
JH
480 continue;
481 }
ca8db142 482 }
a876ed83 483
7a21632f
DS
484 /* Is it a directory? */
485 if (S_ISDIR(st.st_mode)) {
486 errno = EISDIR;
487 return NULL;
488 }
489
a876ed83
JH
490 /*
491 * Anything else, just open it and try to use it as
492 * a ref
493 */
494 fd = open(path, O_RDONLY);
495 if (fd < 0)
496 return NULL;
93d26e4c 497 len = read_in_full(fd, buffer, sizeof(buffer)-1);
a876ed83
JH
498 close(fd);
499
500 /*
501 * Is it a symbolic ref?
502 */
503 if (len < 4 || memcmp("ref:", buffer, 4))
504 break;
505 buf = buffer + 4;
506 len -= 4;
507 while (len && isspace(*buf))
508 buf++, len--;
509 while (len && isspace(buf[len-1]))
ed378ec7
LT
510 len--;
511 buf[len] = 0;
512 memcpy(ref_buffer, buf, len + 1);
513 ref = ref_buffer;
8da19775
JH
514 if (flag)
515 *flag |= REF_ISSYMREF;
8a65ff76 516 }
a876ed83
JH
517 if (len < 40 || get_sha1_hex(buffer, sha1))
518 return NULL;
ed378ec7 519 return ref;
a876ed83
JH
520}
521
d08bae7e
IL
522/* The argument to filter_refs */
523struct ref_filter {
524 const char *pattern;
525 each_ref_fn *fn;
526 void *cb_data;
527};
528
ed378ec7 529int read_ref(const char *ref, unsigned char *sha1)
a876ed83 530{
8da19775 531 if (resolve_ref(ref, sha1, 1, NULL))
a876ed83
JH
532 return 0;
533 return -1;
8a65ff76
LT
534}
535
f8948e2f 536#define DO_FOR_EACH_INCLUDE_BROKEN 01
ef06b918 537static int do_one_ref(const char *base, each_ref_fn fn, int trim,
f8948e2f 538 int flags, void *cb_data, struct ref_list *entry)
ef06b918
JH
539{
540 if (strncmp(base, entry->name, trim))
541 return 0;
eafb4526
JH
542 /* Is this a "negative ref" that represents a deleted ref? */
543 if (is_null_sha1(entry->sha1))
544 return 0;
f8948e2f 545 if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) {
f8948e2f
JH
546 if (!has_sha1_file(entry->sha1)) {
547 error("%s does not point to a valid object!", entry->name);
548 return 0;
549 }
ef06b918 550 }
0ae91be0 551 current_ref = entry;
ef06b918
JH
552 return fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
553}
554
d08bae7e
IL
555static int filter_refs(const char *ref, const unsigned char *sha, int flags,
556 void *data)
557{
558 struct ref_filter *filter = (struct ref_filter *)data;
559 if (fnmatch(filter->pattern, ref, 0))
560 return 0;
561 return filter->fn(ref, sha, flags, filter->cb_data);
562}
563
cf0adba7
JH
564int peel_ref(const char *ref, unsigned char *sha1)
565{
566 int flag;
567 unsigned char base[20];
568 struct object *o;
569
0ae91be0
SP
570 if (current_ref && (current_ref->name == ref
571 || !strcmp(current_ref->name, ref))) {
572 if (current_ref->flag & REF_KNOWS_PEELED) {
573 hashcpy(sha1, current_ref->peeled);
574 return 0;
575 }
576 hashcpy(base, current_ref->sha1);
577 goto fallback;
578 }
579
cf0adba7
JH
580 if (!resolve_ref(ref, base, 1, &flag))
581 return -1;
582
583 if ((flag & REF_ISPACKED)) {
584 struct ref_list *list = get_packed_refs();
cf0adba7
JH
585
586 while (list) {
f4204ab9
JH
587 if (!strcmp(list->name, ref)) {
588 if (list->flag & REF_KNOWS_PEELED) {
589 hashcpy(sha1, list->peeled);
590 return 0;
591 }
592 /* older pack-refs did not leave peeled ones */
593 break;
cf0adba7
JH
594 }
595 list = list->next;
596 }
cf0adba7
JH
597 }
598
0ae91be0 599fallback:
cf0adba7 600 o = parse_object(base);
8c87dc77 601 if (o && o->type == OBJ_TAG) {
cf0adba7
JH
602 o = deref_tag(o, ref, 0);
603 if (o) {
604 hashcpy(sha1, o->sha1);
605 return 0;
606 }
607 }
608 return -1;
609}
610
8da19775 611static int do_for_each_ref(const char *base, each_ref_fn fn, int trim,
f8948e2f 612 int flags, void *cb_data)
8a65ff76 613{
0ae91be0 614 int retval = 0;
e1e22e37
LT
615 struct ref_list *packed = get_packed_refs();
616 struct ref_list *loose = get_loose_refs();
8a65ff76 617
e142a3c6
DB
618 struct ref_list *extra;
619
620 for (extra = extra_refs; extra; extra = extra->next)
f8948e2f 621 retval = do_one_ref(base, fn, trim, flags, cb_data, extra);
e142a3c6 622
e1e22e37
LT
623 while (packed && loose) {
624 struct ref_list *entry;
625 int cmp = strcmp(packed->name, loose->name);
626 if (!cmp) {
627 packed = packed->next;
628 continue;
6cada6a9 629 }
e1e22e37
LT
630 if (cmp > 0) {
631 entry = loose;
632 loose = loose->next;
633 } else {
634 entry = packed;
635 packed = packed->next;
636 }
f8948e2f 637 retval = do_one_ref(base, fn, trim, flags, cb_data, entry);
e1e22e37 638 if (retval)
0ae91be0 639 goto end_each;
e1e22e37 640 }
8a65ff76 641
ef06b918 642 for (packed = packed ? packed : loose; packed; packed = packed->next) {
f8948e2f 643 retval = do_one_ref(base, fn, trim, flags, cb_data, packed);
ef06b918 644 if (retval)
0ae91be0 645 goto end_each;
8a65ff76 646 }
0ae91be0
SP
647
648end_each:
649 current_ref = NULL;
650 return retval;
8a65ff76
LT
651}
652
cb5d709f 653int head_ref(each_ref_fn fn, void *cb_data)
723c31fe
LT
654{
655 unsigned char sha1[20];
8da19775
JH
656 int flag;
657
658 if (resolve_ref("HEAD", sha1, 1, &flag))
659 return fn("HEAD", sha1, flag, cb_data);
2f34ba32 660 return 0;
723c31fe
LT
661}
662
cb5d709f 663int for_each_ref(each_ref_fn fn, void *cb_data)
8a65ff76 664{
f8948e2f 665 return do_for_each_ref("refs/", fn, 0, 0, cb_data);
a62be77f
SE
666}
667
2a8177b6
CC
668int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
669{
670 return do_for_each_ref(prefix, fn, strlen(prefix), 0, cb_data);
671}
672
cb5d709f 673int for_each_tag_ref(each_ref_fn fn, void *cb_data)
a62be77f 674{
2a8177b6 675 return for_each_ref_in("refs/tags/", fn, cb_data);
a62be77f
SE
676}
677
cb5d709f 678int for_each_branch_ref(each_ref_fn fn, void *cb_data)
a62be77f 679{
2a8177b6 680 return for_each_ref_in("refs/heads/", fn, cb_data);
a62be77f
SE
681}
682
cb5d709f 683int for_each_remote_ref(each_ref_fn fn, void *cb_data)
a62be77f 684{
2a8177b6 685 return for_each_ref_in("refs/remotes/", fn, cb_data);
f8948e2f
JH
686}
687
29268700
CC
688int for_each_replace_ref(each_ref_fn fn, void *cb_data)
689{
690 return do_for_each_ref("refs/replace/", fn, 13, 0, cb_data);
691}
692
b09fe971
IL
693int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
694 const char *prefix, void *cb_data)
d08bae7e
IL
695{
696 struct strbuf real_pattern = STRBUF_INIT;
697 struct ref_filter filter;
698 const char *has_glob_specials;
699 int ret;
700
b09fe971 701 if (!prefix && prefixcmp(pattern, "refs/"))
d08bae7e 702 strbuf_addstr(&real_pattern, "refs/");
b09fe971
IL
703 else if (prefix)
704 strbuf_addstr(&real_pattern, prefix);
d08bae7e
IL
705 strbuf_addstr(&real_pattern, pattern);
706
707 has_glob_specials = strpbrk(pattern, "?*[");
708 if (!has_glob_specials) {
9517e6b8 709 /* Append implied '/' '*' if not present. */
d08bae7e
IL
710 if (real_pattern.buf[real_pattern.len - 1] != '/')
711 strbuf_addch(&real_pattern, '/');
712 /* No need to check for '*', there is none. */
713 strbuf_addch(&real_pattern, '*');
714 }
715
716 filter.pattern = real_pattern.buf;
717 filter.fn = fn;
718 filter.cb_data = cb_data;
719 ret = for_each_ref(filter_refs, &filter);
720
721 strbuf_release(&real_pattern);
722 return ret;
723}
724
b09fe971
IL
725int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data)
726{
727 return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
728}
729
f8948e2f
JH
730int for_each_rawref(each_ref_fn fn, void *cb_data)
731{
732 return do_for_each_ref("refs/", fn, 0,
733 DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
8a65ff76
LT
734}
735
03feddd6
JH
736/*
737 * Make sure "ref" is something reasonable to have under ".git/refs/";
738 * We do not like it if:
739 *
740 * - any path component of it begins with ".", or
741 * - it has double dots "..", or
742 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
743 * - it ends with a "/".
3e262b95 744 * - it ends with ".lock"
a4c2e699 745 * - it contains a "\" (backslash)
03feddd6
JH
746 */
747
748static inline int bad_ref_char(int ch)
749{
8558fd9e 750 if (((unsigned) ch) <= ' ' ||
a4c2e699 751 ch == '~' || ch == '^' || ch == ':' || ch == '\\')
8558fd9e
DB
752 return 1;
753 /* 2.13 Pattern Matching Notation */
754 if (ch == '?' || ch == '[') /* Unsupported */
755 return 1;
756 if (ch == '*') /* Supported at the end */
757 return 2;
758 return 0;
03feddd6
JH
759}
760
95fc7512
DB
761int check_ref_format(const char *ref)
762{
cbdffe40 763 int ch, level, bad_type, last;
abd2bde7 764 int ret = CHECK_REF_FORMAT_OK;
03feddd6
JH
765 const char *cp = ref;
766
767 level = 0;
768 while (1) {
769 while ((ch = *cp++) == '/')
770 ; /* tolerate duplicated slashes */
771 if (!ch)
5f7b202a
JH
772 /* should not end with slashes */
773 return CHECK_REF_FORMAT_ERROR;
03feddd6
JH
774
775 /* we are at the beginning of the path component */
8558fd9e 776 if (ch == '.')
5f7b202a 777 return CHECK_REF_FORMAT_ERROR;
8558fd9e
DB
778 bad_type = bad_ref_char(ch);
779 if (bad_type) {
abd2bde7
DB
780 if (bad_type == 2 && (!*cp || *cp == '/') &&
781 ret == CHECK_REF_FORMAT_OK)
782 ret = CHECK_REF_FORMAT_WILDCARD;
783 else
784 return CHECK_REF_FORMAT_ERROR;
8558fd9e 785 }
03feddd6 786
cbdffe40 787 last = ch;
03feddd6
JH
788 /* scan the rest of the path component */
789 while ((ch = *cp++) != 0) {
8558fd9e 790 bad_type = bad_ref_char(ch);
cbdffe40 791 if (bad_type)
08fbdb30 792 return CHECK_REF_FORMAT_ERROR;
03feddd6
JH
793 if (ch == '/')
794 break;
cbdffe40
JH
795 if (last == '.' && ch == '.')
796 return CHECK_REF_FORMAT_ERROR;
797 if (last == '@' && ch == '{')
5f7b202a 798 return CHECK_REF_FORMAT_ERROR;
cbdffe40 799 last = ch;
03feddd6
JH
800 }
801 level++;
802 if (!ch) {
cbdffe40
JH
803 if (ref <= cp - 2 && cp[-2] == '.')
804 return CHECK_REF_FORMAT_ERROR;
03feddd6 805 if (level < 2)
5f7b202a 806 return CHECK_REF_FORMAT_ONELEVEL;
3e262b95
SP
807 if (has_extension(ref, ".lock"))
808 return CHECK_REF_FORMAT_ERROR;
abd2bde7 809 return ret;
03feddd6
JH
810 }
811 }
95fc7512
DB
812}
813
4577e483 814const char *prettify_refname(const char *name)
a9c37a72 815{
a9c37a72
DB
816 return name + (
817 !prefixcmp(name, "refs/heads/") ? 11 :
818 !prefixcmp(name, "refs/tags/") ? 10 :
819 !prefixcmp(name, "refs/remotes/") ? 13 :
820 0);
821}
822
79803322
SP
823const char *ref_rev_parse_rules[] = {
824 "%.*s",
825 "refs/%.*s",
826 "refs/tags/%.*s",
827 "refs/heads/%.*s",
828 "refs/remotes/%.*s",
829 "refs/remotes/%.*s/HEAD",
830 NULL
831};
832
605b4978
SP
833const char *ref_fetch_rules[] = {
834 "%.*s",
835 "refs/%.*s",
836 "refs/heads/%.*s",
837 NULL
838};
839
79803322
SP
840int refname_match(const char *abbrev_name, const char *full_name, const char **rules)
841{
842 const char **p;
843 const int abbrev_name_len = strlen(abbrev_name);
844
845 for (p = rules; *p; p++) {
846 if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
847 return 1;
848 }
849 }
850
851 return 0;
852}
853
e5f38ec3 854static struct ref_lock *verify_lock(struct ref_lock *lock,
4bd18c43
SP
855 const unsigned char *old_sha1, int mustexist)
856{
8da19775 857 if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
434cd0cd 858 error("Can't verify ref %s", lock->ref_name);
4bd18c43
SP
859 unlock_ref(lock);
860 return NULL;
861 }
a89fccd2 862 if (hashcmp(lock->old_sha1, old_sha1)) {
434cd0cd 863 error("Ref %s is at %s but expected %s", lock->ref_name,
4bd18c43
SP
864 sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
865 unlock_ref(lock);
866 return NULL;
867 }
868 return lock;
869}
870
7155b727 871static int remove_empty_directories(const char *file)
bc7127ef
JH
872{
873 /* we want to create a file but there is a directory there;
874 * if that is an empty directory (or a directory that contains
875 * only empty directories), remove them.
876 */
7155b727
JS
877 struct strbuf path;
878 int result;
bc7127ef 879
7155b727
JS
880 strbuf_init(&path, 20);
881 strbuf_addstr(&path, file);
882
a0f4afbe 883 result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY);
7155b727
JS
884
885 strbuf_release(&path);
886
887 return result;
bc7127ef
JH
888}
889
c976d415
LH
890static int is_refname_available(const char *ref, const char *oldref,
891 struct ref_list *list, int quiet)
892{
893 int namlen = strlen(ref); /* e.g. 'foo/bar' */
894 while (list) {
895 /* list->name could be 'foo' or 'foo/bar/baz' */
896 if (!oldref || strcmp(oldref, list->name)) {
897 int len = strlen(list->name);
898 int cmplen = (namlen < len) ? namlen : len;
899 const char *lead = (namlen < len) ? list->name : ref;
900 if (!strncmp(ref, list->name, cmplen) &&
901 lead[cmplen] == '/') {
902 if (!quiet)
903 error("'%s' exists; cannot create '%s'",
904 list->name, ref);
905 return 0;
906 }
907 }
908 list = list->next;
909 }
910 return 1;
911}
912
68db31cc 913static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p)
4bd18c43 914{
434cd0cd 915 char *ref_file;
ed378ec7 916 const char *orig_ref = ref;
4bd18c43 917 struct ref_lock *lock;
5cc3cef9 918 int last_errno = 0;
acd3b9ec 919 int type, lflags;
4431fcc4 920 int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
5bdd8d4a 921 int missing = 0;
4bd18c43
SP
922
923 lock = xcalloc(1, sizeof(struct ref_lock));
924 lock->lock_fd = -1;
925
68db31cc 926 ref = resolve_ref(ref, lock->old_sha1, mustexist, &type);
bc7127ef
JH
927 if (!ref && errno == EISDIR) {
928 /* we are trying to lock foo but we used to
929 * have foo/bar which now does not exist;
930 * it is normal for the empty directory 'foo'
931 * to remain.
932 */
933 ref_file = git_path("%s", orig_ref);
5cc3cef9
JH
934 if (remove_empty_directories(ref_file)) {
935 last_errno = errno;
936 error("there are still refs under '%s'", orig_ref);
937 goto error_return;
938 }
68db31cc 939 ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type);
bc7127ef 940 }
68db31cc
SV
941 if (type_p)
942 *type_p = type;
ed378ec7 943 if (!ref) {
5cc3cef9 944 last_errno = errno;
818f477c 945 error("unable to resolve reference %s: %s",
ed378ec7 946 orig_ref, strerror(errno));
5cc3cef9 947 goto error_return;
4bd18c43 948 }
5bdd8d4a 949 missing = is_null_sha1(lock->old_sha1);
c976d415
LH
950 /* When the ref did not exist and we are creating it,
951 * make sure there is no existing ref that is packed
952 * whose name begins with our refname, nor a ref whose
953 * name is a proper prefix of our refname.
954 */
5bdd8d4a 955 if (missing &&
f475e08e
JK
956 !is_refname_available(ref, NULL, get_packed_refs(), 0)) {
957 last_errno = ENOTDIR;
c976d415 958 goto error_return;
f475e08e 959 }
22a3844e 960
c33d5174 961 lock->lk = xcalloc(1, sizeof(struct lock_file));
4bd18c43 962
acd3b9ec
JH
963 lflags = LOCK_DIE_ON_ERROR;
964 if (flags & REF_NODEREF) {
68db31cc 965 ref = orig_ref;
acd3b9ec
JH
966 lflags |= LOCK_NODEREF;
967 }
434cd0cd 968 lock->ref_name = xstrdup(ref);
1655707c 969 lock->orig_ref_name = xstrdup(orig_ref);
7c1a278d 970 ref_file = git_path("%s", ref);
5bdd8d4a 971 if (missing)
68db31cc
SV
972 lock->force_write = 1;
973 if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
974 lock->force_write = 1;
4bd18c43 975
5cc3cef9
JH
976 if (safe_create_leading_directories(ref_file)) {
977 last_errno = errno;
978 error("unable to create directory for %s", ref_file);
979 goto error_return;
980 }
4bd18c43 981
acd3b9ec 982 lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags);
4bd18c43 983 return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
5cc3cef9
JH
984
985 error_return:
986 unlock_ref(lock);
987 errno = last_errno;
988 return NULL;
4bd18c43
SP
989}
990
4431fcc4 991struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1)
95fc7512 992{
53cce84c 993 char refpath[PATH_MAX];
95fc7512 994 if (check_ref_format(ref))
4bd18c43 995 return NULL;
53cce84c 996 strcpy(refpath, mkpath("refs/%s", ref));
68db31cc 997 return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
4bd18c43
SP
998}
999
68db31cc 1000struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags)
4bd18c43 1001{
5f7b202a 1002 switch (check_ref_format(ref)) {
5f7b202a 1003 default:
257f3020
JH
1004 return NULL;
1005 case 0:
1006 case CHECK_REF_FORMAT_ONELEVEL:
5f7b202a
JH
1007 return lock_ref_sha1_basic(ref, old_sha1, flags, NULL);
1008 }
c0277d15
JH
1009}
1010
26a063a1
JH
1011static struct lock_file packlock;
1012
c0277d15
JH
1013static int repack_without_ref(const char *refname)
1014{
1015 struct ref_list *list, *packed_ref_list;
1016 int fd;
1017 int found = 0;
c0277d15
JH
1018
1019 packed_ref_list = get_packed_refs();
1020 for (list = packed_ref_list; list; list = list->next) {
1021 if (!strcmp(refname, list->name)) {
1022 found = 1;
1023 break;
1024 }
1025 }
1026 if (!found)
1027 return 0;
c0277d15 1028 fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
1b018fd9
MV
1029 if (fd < 0) {
1030 unable_to_lock_error(git_path("packed-refs"), errno);
c0277d15 1031 return error("cannot delete '%s' from packed refs", refname);
1b018fd9 1032 }
c0277d15
JH
1033
1034 for (list = packed_ref_list; list; list = list->next) {
1035 char line[PATH_MAX + 100];
1036 int len;
1037
1038 if (!strcmp(refname, list->name))
1039 continue;
1040 len = snprintf(line, sizeof(line), "%s %s\n",
1041 sha1_to_hex(list->sha1), list->name);
1042 /* this should not happen but just being defensive */
1043 if (len > sizeof(line))
1044 die("too long a refname '%s'", list->name);
1045 write_or_die(fd, line, len);
1046 }
1047 return commit_lock_file(&packlock);
1048}
1049
eca35a25 1050int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
c0277d15
JH
1051{
1052 struct ref_lock *lock;
eca35a25 1053 int err, i = 0, ret = 0, flag = 0;
c0277d15 1054
68db31cc 1055 lock = lock_ref_sha1_basic(refname, sha1, 0, &flag);
c0277d15
JH
1056 if (!lock)
1057 return 1;
045a476f 1058 if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
c0277d15 1059 /* loose */
eca35a25
MV
1060 const char *path;
1061
1062 if (!(delopt & REF_NODEREF)) {
1063 i = strlen(lock->lk->filename) - 5; /* .lock */
1064 lock->lk->filename[i] = 0;
1065 path = lock->lk->filename;
1066 } else {
9db56f71 1067 path = git_path("%s", refname);
eca35a25 1068 }
691f1a28
AR
1069 err = unlink_or_warn(path);
1070 if (err && errno != ENOENT)
c0277d15 1071 ret = 1;
691f1a28 1072
eca35a25
MV
1073 if (!(delopt & REF_NODEREF))
1074 lock->lk->filename[i] = '.';
c0277d15
JH
1075 }
1076 /* removing the loose one could have resurrected an earlier
1077 * packed one. Also, if it was not loose we need to repack
1078 * without it.
1079 */
1080 ret |= repack_without_ref(refname);
1081
691f1a28 1082 unlink_or_warn(git_path("logs/%s", lock->ref_name));
c0277d15
JH
1083 invalidate_cached_refs();
1084 unlock_ref(lock);
1085 return ret;
4bd18c43
SP
1086}
1087
678d0f4c 1088int rename_ref(const char *oldref, const char *newref, const char *logmsg)
c976d415
LH
1089{
1090 static const char renamed_ref[] = "RENAMED-REF";
1091 unsigned char sha1[20], orig_sha1[20];
1092 int flag = 0, logmoved = 0;
1093 struct ref_lock *lock;
c976d415 1094 struct stat loginfo;
16c2bfbb 1095 int log = !lstat(git_path("logs/%s", oldref), &loginfo);
eca35a25 1096 const char *symref = NULL;
c976d415 1097
450d4c0f 1098 if (log && S_ISLNK(loginfo.st_mode))
c976d415
LH
1099 return error("reflog for %s is a symlink", oldref);
1100
eca35a25
MV
1101 symref = resolve_ref(oldref, orig_sha1, 1, &flag);
1102 if (flag & REF_ISSYMREF)
fa58186c
MV
1103 return error("refname %s is a symbolic ref, renaming it is not supported",
1104 oldref);
eca35a25 1105 if (!symref)
c976d415
LH
1106 return error("refname %s not found", oldref);
1107
1108 if (!is_refname_available(newref, oldref, get_packed_refs(), 0))
1109 return 1;
1110
1111 if (!is_refname_available(newref, oldref, get_loose_refs(), 0))
1112 return 1;
1113
68db31cc 1114 lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL);
c976d415
LH
1115 if (!lock)
1116 return error("unable to lock %s", renamed_ref);
1117 lock->force_write = 1;
678d0f4c 1118 if (write_ref_sha1(lock, orig_sha1, logmsg))
c976d415
LH
1119 return error("unable to save current sha1 in %s", renamed_ref);
1120
1121 if (log && rename(git_path("logs/%s", oldref), git_path("tmp-renamed-log")))
1122 return error("unable to move logfile logs/%s to tmp-renamed-log: %s",
1123 oldref, strerror(errno));
1124
eca35a25 1125 if (delete_ref(oldref, orig_sha1, REF_NODEREF)) {
c976d415
LH
1126 error("unable to delete old %s", oldref);
1127 goto rollback;
1128 }
1129
eca35a25 1130 if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1, REF_NODEREF)) {
c976d415
LH
1131 if (errno==EISDIR) {
1132 if (remove_empty_directories(git_path("%s", newref))) {
1133 error("Directory not empty: %s", newref);
1134 goto rollback;
1135 }
1136 } else {
1137 error("unable to delete existing %s", newref);
1138 goto rollback;
1139 }
1140 }
1141
1142 if (log && safe_create_leading_directories(git_path("logs/%s", newref))) {
1143 error("unable to create directory for %s", newref);
1144 goto rollback;
1145 }
1146
1147 retry:
1148 if (log && rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref))) {
d9e74d57
JR
1149 if (errno==EISDIR || errno==ENOTDIR) {
1150 /*
1151 * rename(a, b) when b is an existing
1152 * directory ought to result in ISDIR, but
1153 * Solaris 5.8 gives ENOTDIR. Sheesh.
1154 */
c976d415
LH
1155 if (remove_empty_directories(git_path("logs/%s", newref))) {
1156 error("Directory not empty: logs/%s", newref);
1157 goto rollback;
1158 }
1159 goto retry;
1160 } else {
1161 error("unable to move logfile tmp-renamed-log to logs/%s: %s",
1162 newref, strerror(errno));
1163 goto rollback;
1164 }
1165 }
1166 logmoved = log;
1167
68db31cc 1168 lock = lock_ref_sha1_basic(newref, NULL, 0, NULL);
c976d415
LH
1169 if (!lock) {
1170 error("unable to lock %s for update", newref);
1171 goto rollback;
1172 }
c976d415
LH
1173 lock->force_write = 1;
1174 hashcpy(lock->old_sha1, orig_sha1);
678d0f4c 1175 if (write_ref_sha1(lock, orig_sha1, logmsg)) {
c976d415
LH
1176 error("unable to write current sha1 into %s", newref);
1177 goto rollback;
1178 }
1179
1180 return 0;
1181
1182 rollback:
68db31cc 1183 lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL);
c976d415
LH
1184 if (!lock) {
1185 error("unable to lock %s for rollback", oldref);
1186 goto rollbacklog;
1187 }
1188
1189 lock->force_write = 1;
1190 flag = log_all_ref_updates;
1191 log_all_ref_updates = 0;
1192 if (write_ref_sha1(lock, orig_sha1, NULL))
1193 error("unable to write current sha1 into %s", oldref);
1194 log_all_ref_updates = flag;
1195
1196 rollbacklog:
1197 if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref)))
1198 error("unable to restore logfile %s from %s: %s",
1199 oldref, newref, strerror(errno));
1200 if (!logmoved && log &&
1201 rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref)))
1202 error("unable to restore logfile %s from tmp-renamed-log: %s",
1203 oldref, strerror(errno));
1204
1205 return 1;
1206}
1207
435fc852 1208int close_ref(struct ref_lock *lock)
b531394d
BC
1209{
1210 if (close_lock_file(lock->lk))
1211 return -1;
1212 lock->lock_fd = -1;
1213 return 0;
1214}
1215
435fc852 1216int commit_ref(struct ref_lock *lock)
b531394d
BC
1217{
1218 if (commit_lock_file(lock->lk))
1219 return -1;
1220 lock->lock_fd = -1;
1221 return 0;
1222}
1223
e5f38ec3 1224void unlock_ref(struct ref_lock *lock)
4bd18c43 1225{
4ed7cd3a
BC
1226 /* Do not free lock->lk -- atexit() still looks at them */
1227 if (lock->lk)
1228 rollback_lock_file(lock->lk);
434cd0cd 1229 free(lock->ref_name);
1655707c 1230 free(lock->orig_ref_name);
4bd18c43
SP
1231 free(lock);
1232}
1233
0ec29a47
JH
1234/*
1235 * copy the reflog message msg to buf, which has been allocated sufficiently
1236 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1237 * because reflog file is one line per entry.
1238 */
1239static int copy_msg(char *buf, const char *msg)
1240{
1241 char *cp = buf;
1242 char c;
1243 int wasspace = 1;
1244
1245 *cp++ = '\t';
1246 while ((c = *msg++)) {
1247 if (wasspace && isspace(c))
1248 continue;
1249 wasspace = isspace(c);
1250 if (wasspace)
1251 c = ' ';
1252 *cp++ = c;
1253 }
1254 while (buf < cp && isspace(cp[-1]))
1255 cp--;
1256 *cp++ = '\n';
1257 return cp - buf;
1258}
1259
9a13f0b7
NP
1260static int log_ref_write(const char *ref_name, const unsigned char *old_sha1,
1261 const unsigned char *new_sha1, const char *msg)
6de08ae6
SP
1262{
1263 int logfd, written, oflags = O_APPEND | O_WRONLY;
1264 unsigned maxlen, len;
8ac65937 1265 int msglen;
958a4789
AR
1266 char log_file[PATH_MAX];
1267 char *logrec;
ff4c8485 1268 const char *committer;
6de08ae6 1269
510c5a8e 1270 if (log_all_ref_updates < 0)
7d1864ce 1271 log_all_ref_updates = !is_bare_repository();
510c5a8e 1272
958a4789 1273 git_snpath(log_file, sizeof(log_file), "logs/%s", ref_name);
9a13f0b7 1274
4057deb5 1275 if (log_all_ref_updates &&
cc44c765
JH
1276 (!prefixcmp(ref_name, "refs/heads/") ||
1277 !prefixcmp(ref_name, "refs/remotes/") ||
bd104db1 1278 !strcmp(ref_name, "HEAD"))) {
9a13f0b7 1279 if (safe_create_leading_directories(log_file) < 0)
6de08ae6 1280 return error("unable to create directory for %s",
9a13f0b7 1281 log_file);
6de08ae6
SP
1282 oflags |= O_CREAT;
1283 }
1284
9a13f0b7 1285 logfd = open(log_file, oflags, 0666);
6de08ae6 1286 if (logfd < 0) {
1974bf62 1287 if (!(oflags & O_CREAT) && errno == ENOENT)
6de08ae6 1288 return 0;
3b463c3f
JH
1289
1290 if ((oflags & O_CREAT) && errno == EISDIR) {
9a13f0b7 1291 if (remove_empty_directories(log_file)) {
3b463c3f 1292 return error("There are still logs under '%s'",
9a13f0b7 1293 log_file);
3b463c3f 1294 }
9a13f0b7 1295 logfd = open(log_file, oflags, 0666);
3b463c3f
JH
1296 }
1297
1298 if (logfd < 0)
1299 return error("Unable to append to %s: %s",
9a13f0b7 1300 log_file, strerror(errno));
6de08ae6
SP
1301 }
1302
443b92b6
MK
1303 adjust_shared_perm(log_file);
1304
0ec29a47 1305 msglen = msg ? strlen(msg) : 0;
774751a8 1306 committer = git_committer_info(0);
8ac65937
JH
1307 maxlen = strlen(committer) + msglen + 100;
1308 logrec = xmalloc(maxlen);
1309 len = sprintf(logrec, "%s %s %s\n",
9a13f0b7
NP
1310 sha1_to_hex(old_sha1),
1311 sha1_to_hex(new_sha1),
8ac65937
JH
1312 committer);
1313 if (msglen)
0ec29a47 1314 len += copy_msg(logrec + len - 1, msg) - 1;
93822c22 1315 written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
6de08ae6 1316 free(logrec);
91c8d590 1317 if (close(logfd) != 0 || written != len)
9a13f0b7 1318 return error("Unable to append to %s", log_file);
6de08ae6
SP
1319 return 0;
1320}
1321
c3b0dec5
LT
1322static int is_branch(const char *refname)
1323{
1324 return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
1325}
1326
4bd18c43
SP
1327int write_ref_sha1(struct ref_lock *lock,
1328 const unsigned char *sha1, const char *logmsg)
1329{
1330 static char term = '\n';
c3b0dec5 1331 struct object *o;
4bd18c43
SP
1332
1333 if (!lock)
95fc7512 1334 return -1;
a89fccd2 1335 if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
4bd18c43
SP
1336 unlock_ref(lock);
1337 return 0;
95fc7512 1338 }
c3b0dec5
LT
1339 o = parse_object(sha1);
1340 if (!o) {
1341 error("Trying to write ref %s with nonexistant object %s",
1342 lock->ref_name, sha1_to_hex(sha1));
1343 unlock_ref(lock);
1344 return -1;
1345 }
1346 if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
1347 error("Trying to write non-commit object %s to branch %s",
1348 sha1_to_hex(sha1), lock->ref_name);
1349 unlock_ref(lock);
1350 return -1;
1351 }
93822c22
AW
1352 if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
1353 write_in_full(lock->lock_fd, &term, 1) != 1
b531394d 1354 || close_ref(lock) < 0) {
c33d5174 1355 error("Couldn't write %s", lock->lk->filename);
4bd18c43
SP
1356 unlock_ref(lock);
1357 return -1;
1358 }
5e290ff7 1359 invalidate_cached_refs();
bd104db1
NP
1360 if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
1361 (strcmp(lock->ref_name, lock->orig_ref_name) &&
1362 log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
6de08ae6
SP
1363 unlock_ref(lock);
1364 return -1;
1365 }
605fac8b
NP
1366 if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
1367 /*
1368 * Special hack: If a branch is updated directly and HEAD
1369 * points to it (may happen on the remote side of a push
1370 * for example) then logically the HEAD reflog should be
1371 * updated too.
1372 * A generic solution implies reverse symref information,
1373 * but finding all symrefs pointing to the given branch
1374 * would be rather costly for this rare event (the direct
1375 * update of a branch) to be worth it. So let's cheat and
1376 * check with HEAD only which should cover 99% of all usage
1377 * scenarios (even 100% of the default ones).
1378 */
1379 unsigned char head_sha1[20];
1380 int head_flag;
1381 const char *head_ref;
1382 head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag);
1383 if (head_ref && (head_flag & REF_ISSYMREF) &&
1384 !strcmp(head_ref, lock->ref_name))
1385 log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
1386 }
b531394d 1387 if (commit_ref(lock)) {
434cd0cd 1388 error("Couldn't set %s", lock->ref_name);
4bd18c43
SP
1389 unlock_ref(lock);
1390 return -1;
1391 }
4bd18c43
SP
1392 unlock_ref(lock);
1393 return 0;
95fc7512 1394}
d556fae2 1395
8b5157e4
NP
1396int create_symref(const char *ref_target, const char *refs_heads_master,
1397 const char *logmsg)
41b625b0
NP
1398{
1399 const char *lockpath;
1400 char ref[1000];
1401 int fd, len, written;
a4f34cbb 1402 char *git_HEAD = git_pathdup("%s", ref_target);
8b5157e4
NP
1403 unsigned char old_sha1[20], new_sha1[20];
1404
1405 if (logmsg && read_ref(ref_target, old_sha1))
1406 hashclr(old_sha1);
41b625b0 1407
d48744d1
JH
1408 if (safe_create_leading_directories(git_HEAD) < 0)
1409 return error("unable to create directory for %s", git_HEAD);
1410
41b625b0
NP
1411#ifndef NO_SYMLINK_HEAD
1412 if (prefer_symlink_refs) {
1413 unlink(git_HEAD);
1414 if (!symlink(refs_heads_master, git_HEAD))
8b5157e4 1415 goto done;
41b625b0
NP
1416 fprintf(stderr, "no symlink - falling back to symbolic ref\n");
1417 }
1418#endif
1419
1420 len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
1421 if (sizeof(ref) <= len) {
1422 error("refname too long: %s", refs_heads_master);
47fc52e2 1423 goto error_free_return;
41b625b0
NP
1424 }
1425 lockpath = mkpath("%s.lock", git_HEAD);
1426 fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
1427 if (fd < 0) {
1428 error("Unable to open %s for writing", lockpath);
47fc52e2 1429 goto error_free_return;
41b625b0
NP
1430 }
1431 written = write_in_full(fd, ref, len);
91c8d590 1432 if (close(fd) != 0 || written != len) {
41b625b0 1433 error("Unable to write to %s", lockpath);
47fc52e2 1434 goto error_unlink_return;
41b625b0
NP
1435 }
1436 if (rename(lockpath, git_HEAD) < 0) {
41b625b0 1437 error("Unable to create %s", git_HEAD);
47fc52e2 1438 goto error_unlink_return;
41b625b0
NP
1439 }
1440 if (adjust_shared_perm(git_HEAD)) {
41b625b0 1441 error("Unable to fix permissions on %s", lockpath);
47fc52e2 1442 error_unlink_return:
691f1a28 1443 unlink_or_warn(lockpath);
47fc52e2
JH
1444 error_free_return:
1445 free(git_HEAD);
1446 return -1;
41b625b0 1447 }
8b5157e4 1448
ee96d11b 1449#ifndef NO_SYMLINK_HEAD
8b5157e4 1450 done:
ee96d11b 1451#endif
8b5157e4
NP
1452 if (logmsg && !read_ref(refs_heads_master, new_sha1))
1453 log_ref_write(ref_target, old_sha1, new_sha1, logmsg);
1454
47fc52e2 1455 free(git_HEAD);
41b625b0
NP
1456 return 0;
1457}
1458
16d7cc90
JH
1459static char *ref_msg(const char *line, const char *endp)
1460{
1461 const char *ep;
16d7cc90 1462 line += 82;
182af834
PH
1463 ep = memchr(line, '\n', endp - line);
1464 if (!ep)
1465 ep = endp;
1466 return xmemdupz(line, ep - line);
16d7cc90
JH
1467}
1468
1469int 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 1470{
e5229042 1471 const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
d556fae2 1472 char *tz_c;
e29cb53a 1473 int logfd, tz, reccnt = 0;
d556fae2
SP
1474 struct stat st;
1475 unsigned long date;
e5229042 1476 unsigned char logged_sha1[20];
cb48cb58 1477 void *log_mapped;
dc49cd76 1478 size_t mapsz;
d556fae2
SP
1479
1480 logfile = git_path("logs/%s", ref);
1481 logfd = open(logfile, O_RDONLY, 0);
1482 if (logfd < 0)
d824cbba 1483 die_errno("Unable to read log '%s'", logfile);
d556fae2
SP
1484 fstat(logfd, &st);
1485 if (!st.st_size)
1486 die("Log %s is empty.", logfile);
dc49cd76
SP
1487 mapsz = xsize_t(st.st_size);
1488 log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0);
cb48cb58 1489 logdata = log_mapped;
d556fae2
SP
1490 close(logfd);
1491
e5229042 1492 lastrec = NULL;
d556fae2
SP
1493 rec = logend = logdata + st.st_size;
1494 while (logdata < rec) {
e29cb53a 1495 reccnt++;
d556fae2
SP
1496 if (logdata < rec && *(rec-1) == '\n')
1497 rec--;
e5229042
SP
1498 lastgt = NULL;
1499 while (logdata < rec && *(rec-1) != '\n') {
d556fae2 1500 rec--;
e5229042
SP
1501 if (*rec == '>')
1502 lastgt = rec;
1503 }
1504 if (!lastgt)
d556fae2 1505 die("Log %s is corrupt.", logfile);
e5229042 1506 date = strtoul(lastgt + 1, &tz_c, 10);
ab2a1a32 1507 if (date <= at_time || cnt == 0) {
76a44c5c 1508 tz = strtoul(tz_c, NULL, 10);
16d7cc90
JH
1509 if (msg)
1510 *msg = ref_msg(rec, logend);
1511 if (cutoff_time)
1512 *cutoff_time = date;
1513 if (cutoff_tz)
1514 *cutoff_tz = tz;
1515 if (cutoff_cnt)
76a44c5c 1516 *cutoff_cnt = reccnt - 1;
e5229042
SP
1517 if (lastrec) {
1518 if (get_sha1_hex(lastrec, logged_sha1))
1519 die("Log %s is corrupt.", logfile);
1520 if (get_sha1_hex(rec + 41, sha1))
1521 die("Log %s is corrupt.", logfile);
a89fccd2 1522 if (hashcmp(logged_sha1, sha1)) {
edbc25c5 1523 warning("Log %s has gap after %s.",
73013afd 1524 logfile, show_date(date, tz, DATE_RFC2822));
e5229042 1525 }
e5f38ec3
JH
1526 }
1527 else if (date == at_time) {
e5229042
SP
1528 if (get_sha1_hex(rec + 41, sha1))
1529 die("Log %s is corrupt.", logfile);
e5f38ec3
JH
1530 }
1531 else {
e5229042
SP
1532 if (get_sha1_hex(rec + 41, logged_sha1))
1533 die("Log %s is corrupt.", logfile);
a89fccd2 1534 if (hashcmp(logged_sha1, sha1)) {
edbc25c5 1535 warning("Log %s unexpectedly ended on %s.",
73013afd 1536 logfile, show_date(date, tz, DATE_RFC2822));
e5229042
SP
1537 }
1538 }
dc49cd76 1539 munmap(log_mapped, mapsz);
d556fae2
SP
1540 return 0;
1541 }
e5229042 1542 lastrec = rec;
ab2a1a32
JH
1543 if (cnt > 0)
1544 cnt--;
d556fae2
SP
1545 }
1546
e5229042
SP
1547 rec = logdata;
1548 while (rec < logend && *rec != '>' && *rec != '\n')
1549 rec++;
1550 if (rec == logend || *rec == '\n')
d556fae2 1551 die("Log %s is corrupt.", logfile);
e5229042 1552 date = strtoul(rec + 1, &tz_c, 10);
d556fae2
SP
1553 tz = strtoul(tz_c, NULL, 10);
1554 if (get_sha1_hex(logdata, sha1))
1555 die("Log %s is corrupt.", logfile);
d1a4489a
JK
1556 if (is_null_sha1(sha1)) {
1557 if (get_sha1_hex(logdata + 41, sha1))
1558 die("Log %s is corrupt.", logfile);
1559 }
16d7cc90
JH
1560 if (msg)
1561 *msg = ref_msg(logdata, logend);
dc49cd76 1562 munmap(log_mapped, mapsz);
16d7cc90
JH
1563
1564 if (cutoff_time)
1565 *cutoff_time = date;
1566 if (cutoff_tz)
1567 *cutoff_tz = tz;
1568 if (cutoff_cnt)
1569 *cutoff_cnt = reccnt;
1570 return 1;
d556fae2 1571}
2ff81662 1572
101d15e0 1573int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long ofs, void *cb_data)
2ff81662
JH
1574{
1575 const char *logfile;
1576 FILE *logfp;
1577 char buf[1024];
2266bf27 1578 int ret = 0;
2ff81662
JH
1579
1580 logfile = git_path("logs/%s", ref);
1581 logfp = fopen(logfile, "r");
1582 if (!logfp)
883d60fa 1583 return -1;
101d15e0
JH
1584
1585 if (ofs) {
1586 struct stat statbuf;
1587 if (fstat(fileno(logfp), &statbuf) ||
1588 statbuf.st_size < ofs ||
1589 fseek(logfp, -ofs, SEEK_END) ||
9d33f7c2
BC
1590 fgets(buf, sizeof(buf), logfp)) {
1591 fclose(logfp);
101d15e0 1592 return -1;
9d33f7c2 1593 }
101d15e0
JH
1594 }
1595
2ff81662
JH
1596 while (fgets(buf, sizeof(buf), logfp)) {
1597 unsigned char osha1[20], nsha1[20];
883d60fa
JS
1598 char *email_end, *message;
1599 unsigned long timestamp;
2266bf27 1600 int len, tz;
2ff81662
JH
1601
1602 /* old SP new SP name <email> SP time TAB msg LF */
1603 len = strlen(buf);
1604 if (len < 83 || buf[len-1] != '\n' ||
1605 get_sha1_hex(buf, osha1) || buf[40] != ' ' ||
883d60fa
JS
1606 get_sha1_hex(buf + 41, nsha1) || buf[81] != ' ' ||
1607 !(email_end = strchr(buf + 82, '>')) ||
1608 email_end[1] != ' ' ||
1609 !(timestamp = strtoul(email_end + 2, &message, 10)) ||
1610 !message || message[0] != ' ' ||
1611 (message[1] != '+' && message[1] != '-') ||
1612 !isdigit(message[2]) || !isdigit(message[3]) ||
b4dd4856 1613 !isdigit(message[4]) || !isdigit(message[5]))
2ff81662 1614 continue; /* corrupt? */
883d60fa
JS
1615 email_end[1] = '\0';
1616 tz = strtol(message + 1, NULL, 10);
b4dd4856
JS
1617 if (message[6] != '\t')
1618 message += 6;
1619 else
1620 message += 7;
883d60fa
JS
1621 ret = fn(osha1, nsha1, buf+82, timestamp, tz, message, cb_data);
1622 if (ret)
2266bf27 1623 break;
2ff81662
JH
1624 }
1625 fclose(logfp);
2266bf27 1626 return ret;
2ff81662 1627}
e29cb53a 1628
101d15e0
JH
1629int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data)
1630{
1631 return for_each_recent_reflog_ent(ref, fn, 0, cb_data);
1632}
1633
eb8381c8
NP
1634static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data)
1635{
1636 DIR *dir = opendir(git_path("logs/%s", base));
fcee5a14 1637 int retval = 0;
eb8381c8
NP
1638
1639 if (dir) {
1640 struct dirent *de;
1641 int baselen = strlen(base);
1642 char *log = xmalloc(baselen + 257);
1643
1644 memcpy(log, base, baselen);
1645 if (baselen && base[baselen-1] != '/')
1646 log[baselen++] = '/';
1647
1648 while ((de = readdir(dir)) != NULL) {
1649 struct stat st;
1650 int namelen;
1651
1652 if (de->d_name[0] == '.')
1653 continue;
1654 namelen = strlen(de->d_name);
1655 if (namelen > 255)
1656 continue;
1657 if (has_extension(de->d_name, ".lock"))
1658 continue;
1659 memcpy(log + baselen, de->d_name, namelen+1);
1660 if (stat(git_path("logs/%s", log), &st) < 0)
1661 continue;
1662 if (S_ISDIR(st.st_mode)) {
1663 retval = do_for_each_reflog(log, fn, cb_data);
1664 } else {
1665 unsigned char sha1[20];
1666 if (!resolve_ref(log, sha1, 0, NULL))
1667 retval = error("bad ref for %s", log);
1668 else
1669 retval = fn(log, sha1, 0, cb_data);
1670 }
1671 if (retval)
1672 break;
1673 }
1674 free(log);
1675 closedir(dir);
1676 }
acb39f64 1677 else if (*base)
fcee5a14 1678 return errno;
eb8381c8
NP
1679 return retval;
1680}
1681
1682int for_each_reflog(each_ref_fn fn, void *cb_data)
1683{
1684 return do_for_each_reflog("", fn, cb_data);
1685}
3d9f037c
CR
1686
1687int update_ref(const char *action, const char *refname,
1688 const unsigned char *sha1, const unsigned char *oldval,
1689 int flags, enum action_on_err onerr)
1690{
1691 static struct ref_lock *lock;
1692 lock = lock_any_ref_for_update(refname, oldval, flags);
1693 if (!lock) {
1694 const char *str = "Cannot lock the ref '%s'.";
1695 switch (onerr) {
1696 case MSG_ON_ERR: error(str, refname); break;
1697 case DIE_ON_ERR: die(str, refname); break;
1698 case QUIET_ON_ERR: break;
1699 }
1700 return 1;
1701 }
1702 if (write_ref_sha1(lock, sha1, action) < 0) {
1703 const char *str = "Cannot update the ref '%s'.";
1704 switch (onerr) {
1705 case MSG_ON_ERR: error(str, refname); break;
1706 case DIE_ON_ERR: die(str, refname); break;
1707 case QUIET_ON_ERR: break;
1708 }
1709 return 1;
1710 }
1711 return 0;
1712}
cda69f48 1713
5483f799 1714struct ref *find_ref_by_name(const struct ref *list, const char *name)
cda69f48
JK
1715{
1716 for ( ; list; list = list->next)
1717 if (!strcmp(list->name, name))
5483f799 1718 return (struct ref *)list;
cda69f48
JK
1719 return NULL;
1720}
7c2b3029
JK
1721
1722/*
1723 * generate a format suitable for scanf from a ref_rev_parse_rules
1724 * rule, that is replace the "%.*s" spec with a "%s" spec
1725 */
1726static void gen_scanf_fmt(char *scanf_fmt, const char *rule)
1727{
1728 char *spec;
1729
1730 spec = strstr(rule, "%.*s");
1731 if (!spec || strstr(spec + 4, "%.*s"))
1732 die("invalid rule in ref_rev_parse_rules: %s", rule);
1733
1734 /* copy all until spec */
1735 strncpy(scanf_fmt, rule, spec - rule);
1736 scanf_fmt[spec - rule] = '\0';
1737 /* copy new spec */
1738 strcat(scanf_fmt, "%s");
1739 /* copy remaining rule */
1740 strcat(scanf_fmt, spec + 4);
1741
1742 return;
1743}
1744
6e7b3309 1745char *shorten_unambiguous_ref(const char *ref, int strict)
7c2b3029
JK
1746{
1747 int i;
1748 static char **scanf_fmts;
1749 static int nr_rules;
1750 char *short_name;
1751
1752 /* pre generate scanf formats from ref_rev_parse_rules[] */
1753 if (!nr_rules) {
1754 size_t total_len = 0;
1755
1756 /* the rule list is NULL terminated, count them first */
1757 for (; ref_rev_parse_rules[nr_rules]; nr_rules++)
1758 /* no +1 because strlen("%s") < strlen("%.*s") */
1759 total_len += strlen(ref_rev_parse_rules[nr_rules]);
1760
1761 scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len);
1762
1763 total_len = 0;
1764 for (i = 0; i < nr_rules; i++) {
1765 scanf_fmts[i] = (char *)&scanf_fmts[nr_rules]
1766 + total_len;
1767 gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]);
1768 total_len += strlen(ref_rev_parse_rules[i]);
1769 }
1770 }
1771
1772 /* bail out if there are no rules */
1773 if (!nr_rules)
1774 return xstrdup(ref);
1775
1776 /* buffer for scanf result, at most ref must fit */
1777 short_name = xstrdup(ref);
1778
1779 /* skip first rule, it will always match */
1780 for (i = nr_rules - 1; i > 0 ; --i) {
1781 int j;
6e7b3309 1782 int rules_to_fail = i;
7c2b3029
JK
1783 int short_name_len;
1784
1785 if (1 != sscanf(ref, scanf_fmts[i], short_name))
1786 continue;
1787
1788 short_name_len = strlen(short_name);
1789
6e7b3309
BW
1790 /*
1791 * in strict mode, all (except the matched one) rules
1792 * must fail to resolve to a valid non-ambiguous ref
1793 */
1794 if (strict)
1795 rules_to_fail = nr_rules;
1796
7c2b3029
JK
1797 /*
1798 * check if the short name resolves to a valid ref,
1799 * but use only rules prior to the matched one
1800 */
6e7b3309 1801 for (j = 0; j < rules_to_fail; j++) {
7c2b3029
JK
1802 const char *rule = ref_rev_parse_rules[j];
1803 unsigned char short_objectname[20];
1804 char refname[PATH_MAX];
1805
6e7b3309
BW
1806 /* skip matched rule */
1807 if (i == j)
1808 continue;
1809
7c2b3029
JK
1810 /*
1811 * the short name is ambiguous, if it resolves
1812 * (with this previous rule) to a valid ref
1813 * read_ref() returns 0 on success
1814 */
1815 mksnpath(refname, sizeof(refname),
1816 rule, short_name_len, short_name);
1817 if (!read_ref(refname, short_objectname))
1818 break;
1819 }
1820
1821 /*
1822 * short name is non-ambiguous if all previous rules
1823 * haven't resolved to a valid ref
1824 */
6e7b3309 1825 if (j == rules_to_fail)
7c2b3029
JK
1826 return short_name;
1827 }
1828
1829 free(short_name);
1830 return xstrdup(ref);
1831}