for-each-ref: add "upstream" format field
[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
JH
288struct warn_if_dangling_data {
289 const char *refname;
290 const char *msg_fmt;
291};
292
293static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1,
294 int flags, void *cb_data)
295{
296 struct warn_if_dangling_data *d = cb_data;
297 const char *resolves_to;
298 unsigned char junk[20];
299
300 if (!(flags & REF_ISSYMREF))
301 return 0;
302
303 resolves_to = resolve_ref(refname, junk, 0, NULL);
304 if (!resolves_to || strcmp(resolves_to, d->refname))
305 return 0;
306
307 printf(d->msg_fmt, refname);
308 return 0;
309}
310
311void warn_dangling_symref(const char *msg_fmt, const char *refname)
312{
313 struct warn_if_dangling_data data = { refname, msg_fmt };
314 for_each_rawref(warn_if_dangling_symref, &data);
315}
316
e1e22e37
LT
317static struct ref_list *get_loose_refs(void)
318{
5e290ff7
JH
319 if (!cached_refs.did_loose) {
320 cached_refs.loose = get_ref_dir("refs", NULL);
321 cached_refs.did_loose = 1;
e1e22e37 322 }
5e290ff7 323 return cached_refs.loose;
e1e22e37
LT
324}
325
ca8db142
LT
326/* We allow "recursive" symbolic refs. Only within reason, though */
327#define MAXDEPTH 5
0ebde32c
LT
328#define MAXREFLEN (1024)
329
330static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result)
331{
332 FILE *f;
333 struct cached_refs refs;
334 struct ref_list *ref;
335 int retval;
336
337 strcpy(name + pathlen, "packed-refs");
338 f = fopen(name, "r");
339 if (!f)
340 return -1;
341 read_packed_refs(f, &refs);
342 fclose(f);
343 ref = refs.packed;
344 retval = -1;
345 while (ref) {
346 if (!strcmp(ref->name, refname)) {
347 retval = 0;
348 memcpy(result, ref->sha1, 20);
349 break;
350 }
351 ref = ref->next;
352 }
353 free_ref_list(refs.packed);
354 return retval;
355}
356
357static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion)
358{
359 int fd, len = strlen(refname);
360 char buffer[128], *p;
361
362 if (recursion > MAXDEPTH || len > MAXREFLEN)
363 return -1;
364 memcpy(name + pathlen, refname, len+1);
365 fd = open(name, O_RDONLY);
366 if (fd < 0)
367 return resolve_gitlink_packed_ref(name, pathlen, refname, result);
368
369 len = read(fd, buffer, sizeof(buffer)-1);
370 close(fd);
371 if (len < 0)
372 return -1;
373 while (len && isspace(buffer[len-1]))
374 len--;
375 buffer[len] = 0;
376
377 /* Was it a detached head or an old-fashioned symlink? */
378 if (!get_sha1_hex(buffer, result))
379 return 0;
380
381 /* Symref? */
382 if (strncmp(buffer, "ref:", 4))
383 return -1;
384 p = buffer + 4;
385 while (isspace(*p))
386 p++;
387
388 return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1);
389}
390
391int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result)
392{
393 int len = strlen(path), retval;
394 char *gitdir;
842abf06 395 const char *tmp;
0ebde32c
LT
396
397 while (len && path[len-1] == '/')
398 len--;
399 if (!len)
400 return -1;
401 gitdir = xmalloc(len + MAXREFLEN + 8);
402 memcpy(gitdir, path, len);
842abf06
LH
403 memcpy(gitdir + len, "/.git", 6);
404 len += 5;
405
406 tmp = read_gitfile_gently(gitdir);
407 if (tmp) {
408 free(gitdir);
409 len = strlen(tmp);
410 gitdir = xmalloc(len + MAXREFLEN + 3);
411 memcpy(gitdir, tmp, len);
412 }
413 gitdir[len] = '/';
414 gitdir[++len] = '\0';
415 retval = resolve_gitlink_ref_recursive(gitdir, len, refname, result, 0);
0ebde32c
LT
416 free(gitdir);
417 return retval;
418}
ca8db142 419
4886b89f
CC
420/*
421 * If the "reading" argument is set, this function finds out what _object_
422 * the ref points at by "reading" the ref. The ref, if it is not symbolic,
423 * has to exist, and if it is symbolic, it has to point at an existing ref,
424 * because the "read" goes through the symref to the ref it points at.
425 *
426 * The access that is not "reading" may often be "writing", but does not
427 * have to; it can be merely checking _where it leads to_. If it is a
428 * prelude to "writing" to the ref, a write to a symref that points at
429 * yet-to-be-born ref will create the real ref pointed by the symref.
430 * reading=0 allows the caller to check where such a symref leads to.
431 */
8da19775 432const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag)
8a65ff76 433{
0104ca09
HO
434 int depth = MAXDEPTH;
435 ssize_t len;
a876ed83 436 char buffer[256];
ed378ec7 437 static char ref_buffer[256];
ca8db142 438
8da19775
JH
439 if (flag)
440 *flag = 0;
441
a876ed83 442 for (;;) {
958a4789 443 char path[PATH_MAX];
a876ed83
JH
444 struct stat st;
445 char *buf;
446 int fd;
8a65ff76 447
a876ed83
JH
448 if (--depth < 0)
449 return NULL;
ca8db142 450
958a4789 451 git_snpath(path, sizeof(path), "%s", ref);
4886b89f 452 /* Special case: non-existing file. */
a876ed83 453 if (lstat(path, &st) < 0) {
434cd0cd
LT
454 struct ref_list *list = get_packed_refs();
455 while (list) {
f4204ab9 456 if (!strcmp(ref, list->name)) {
434cd0cd 457 hashcpy(sha1, list->sha1);
8da19775
JH
458 if (flag)
459 *flag |= REF_ISPACKED;
434cd0cd
LT
460 return ref;
461 }
462 list = list->next;
463 }
a876ed83
JH
464 if (reading || errno != ENOENT)
465 return NULL;
e702496e 466 hashclr(sha1);
ed378ec7 467 return ref;
a876ed83 468 }
ca8db142 469
a876ed83
JH
470 /* Follow "normalized" - ie "refs/.." symlinks by hand */
471 if (S_ISLNK(st.st_mode)) {
472 len = readlink(path, buffer, sizeof(buffer)-1);
473 if (len >= 5 && !memcmp("refs/", buffer, 5)) {
ed378ec7
LT
474 buffer[len] = 0;
475 strcpy(ref_buffer, buffer);
476 ref = ref_buffer;
8da19775
JH
477 if (flag)
478 *flag |= REF_ISSYMREF;
a876ed83
JH
479 continue;
480 }
ca8db142 481 }
a876ed83 482
7a21632f
DS
483 /* Is it a directory? */
484 if (S_ISDIR(st.st_mode)) {
485 errno = EISDIR;
486 return NULL;
487 }
488
a876ed83
JH
489 /*
490 * Anything else, just open it and try to use it as
491 * a ref
492 */
493 fd = open(path, O_RDONLY);
494 if (fd < 0)
495 return NULL;
93d26e4c 496 len = read_in_full(fd, buffer, sizeof(buffer)-1);
a876ed83
JH
497 close(fd);
498
499 /*
500 * Is it a symbolic ref?
501 */
502 if (len < 4 || memcmp("ref:", buffer, 4))
503 break;
504 buf = buffer + 4;
505 len -= 4;
506 while (len && isspace(*buf))
507 buf++, len--;
508 while (len && isspace(buf[len-1]))
ed378ec7
LT
509 len--;
510 buf[len] = 0;
511 memcpy(ref_buffer, buf, len + 1);
512 ref = ref_buffer;
8da19775
JH
513 if (flag)
514 *flag |= REF_ISSYMREF;
8a65ff76 515 }
a876ed83
JH
516 if (len < 40 || get_sha1_hex(buffer, sha1))
517 return NULL;
ed378ec7 518 return ref;
a876ed83
JH
519}
520
ed378ec7 521int read_ref(const char *ref, unsigned char *sha1)
a876ed83 522{
8da19775 523 if (resolve_ref(ref, sha1, 1, NULL))
a876ed83
JH
524 return 0;
525 return -1;
8a65ff76
LT
526}
527
f8948e2f 528#define DO_FOR_EACH_INCLUDE_BROKEN 01
ef06b918 529static int do_one_ref(const char *base, each_ref_fn fn, int trim,
f8948e2f 530 int flags, void *cb_data, struct ref_list *entry)
ef06b918
JH
531{
532 if (strncmp(base, entry->name, trim))
533 return 0;
f8948e2f
JH
534 if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) {
535 if (is_null_sha1(entry->sha1))
536 return 0;
537 if (!has_sha1_file(entry->sha1)) {
538 error("%s does not point to a valid object!", entry->name);
539 return 0;
540 }
ef06b918 541 }
0ae91be0 542 current_ref = entry;
ef06b918
JH
543 return fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
544}
545
cf0adba7
JH
546int peel_ref(const char *ref, unsigned char *sha1)
547{
548 int flag;
549 unsigned char base[20];
550 struct object *o;
551
0ae91be0
SP
552 if (current_ref && (current_ref->name == ref
553 || !strcmp(current_ref->name, ref))) {
554 if (current_ref->flag & REF_KNOWS_PEELED) {
555 hashcpy(sha1, current_ref->peeled);
556 return 0;
557 }
558 hashcpy(base, current_ref->sha1);
559 goto fallback;
560 }
561
cf0adba7
JH
562 if (!resolve_ref(ref, base, 1, &flag))
563 return -1;
564
565 if ((flag & REF_ISPACKED)) {
566 struct ref_list *list = get_packed_refs();
cf0adba7
JH
567
568 while (list) {
f4204ab9
JH
569 if (!strcmp(list->name, ref)) {
570 if (list->flag & REF_KNOWS_PEELED) {
571 hashcpy(sha1, list->peeled);
572 return 0;
573 }
574 /* older pack-refs did not leave peeled ones */
575 break;
cf0adba7
JH
576 }
577 list = list->next;
578 }
cf0adba7
JH
579 }
580
0ae91be0 581fallback:
cf0adba7 582 o = parse_object(base);
8c87dc77 583 if (o && o->type == OBJ_TAG) {
cf0adba7
JH
584 o = deref_tag(o, ref, 0);
585 if (o) {
586 hashcpy(sha1, o->sha1);
587 return 0;
588 }
589 }
590 return -1;
591}
592
8da19775 593static int do_for_each_ref(const char *base, each_ref_fn fn, int trim,
f8948e2f 594 int flags, void *cb_data)
8a65ff76 595{
0ae91be0 596 int retval = 0;
e1e22e37
LT
597 struct ref_list *packed = get_packed_refs();
598 struct ref_list *loose = get_loose_refs();
8a65ff76 599
e142a3c6
DB
600 struct ref_list *extra;
601
602 for (extra = extra_refs; extra; extra = extra->next)
f8948e2f 603 retval = do_one_ref(base, fn, trim, flags, cb_data, extra);
e142a3c6 604
e1e22e37
LT
605 while (packed && loose) {
606 struct ref_list *entry;
607 int cmp = strcmp(packed->name, loose->name);
608 if (!cmp) {
609 packed = packed->next;
610 continue;
6cada6a9 611 }
e1e22e37
LT
612 if (cmp > 0) {
613 entry = loose;
614 loose = loose->next;
615 } else {
616 entry = packed;
617 packed = packed->next;
618 }
f8948e2f 619 retval = do_one_ref(base, fn, trim, flags, cb_data, entry);
e1e22e37 620 if (retval)
0ae91be0 621 goto end_each;
e1e22e37 622 }
8a65ff76 623
ef06b918 624 for (packed = packed ? packed : loose; packed; packed = packed->next) {
f8948e2f 625 retval = do_one_ref(base, fn, trim, flags, cb_data, packed);
ef06b918 626 if (retval)
0ae91be0 627 goto end_each;
8a65ff76 628 }
0ae91be0
SP
629
630end_each:
631 current_ref = NULL;
632 return retval;
8a65ff76
LT
633}
634
cb5d709f 635int head_ref(each_ref_fn fn, void *cb_data)
723c31fe
LT
636{
637 unsigned char sha1[20];
8da19775
JH
638 int flag;
639
640 if (resolve_ref("HEAD", sha1, 1, &flag))
641 return fn("HEAD", sha1, flag, cb_data);
2f34ba32 642 return 0;
723c31fe
LT
643}
644
cb5d709f 645int for_each_ref(each_ref_fn fn, void *cb_data)
8a65ff76 646{
f8948e2f 647 return do_for_each_ref("refs/", fn, 0, 0, cb_data);
a62be77f
SE
648}
649
cb5d709f 650int for_each_tag_ref(each_ref_fn fn, void *cb_data)
a62be77f 651{
f8948e2f 652 return do_for_each_ref("refs/tags/", fn, 10, 0, cb_data);
a62be77f
SE
653}
654
cb5d709f 655int for_each_branch_ref(each_ref_fn fn, void *cb_data)
a62be77f 656{
f8948e2f 657 return do_for_each_ref("refs/heads/", fn, 11, 0, cb_data);
a62be77f
SE
658}
659
cb5d709f 660int for_each_remote_ref(each_ref_fn fn, void *cb_data)
a62be77f 661{
f8948e2f
JH
662 return do_for_each_ref("refs/remotes/", fn, 13, 0, cb_data);
663}
664
665int for_each_rawref(each_ref_fn fn, void *cb_data)
666{
667 return do_for_each_ref("refs/", fn, 0,
668 DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
8a65ff76
LT
669}
670
03feddd6
JH
671/*
672 * Make sure "ref" is something reasonable to have under ".git/refs/";
673 * We do not like it if:
674 *
675 * - any path component of it begins with ".", or
676 * - it has double dots "..", or
677 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
678 * - it ends with a "/".
3e262b95 679 * - it ends with ".lock"
03feddd6
JH
680 */
681
682static inline int bad_ref_char(int ch)
683{
8558fd9e
DB
684 if (((unsigned) ch) <= ' ' ||
685 ch == '~' || ch == '^' || ch == ':')
686 return 1;
687 /* 2.13 Pattern Matching Notation */
688 if (ch == '?' || ch == '[') /* Unsupported */
689 return 1;
690 if (ch == '*') /* Supported at the end */
691 return 2;
692 return 0;
03feddd6
JH
693}
694
95fc7512
DB
695int check_ref_format(const char *ref)
696{
cbdffe40 697 int ch, level, bad_type, last;
abd2bde7 698 int ret = CHECK_REF_FORMAT_OK;
03feddd6
JH
699 const char *cp = ref;
700
701 level = 0;
702 while (1) {
703 while ((ch = *cp++) == '/')
704 ; /* tolerate duplicated slashes */
705 if (!ch)
5f7b202a
JH
706 /* should not end with slashes */
707 return CHECK_REF_FORMAT_ERROR;
03feddd6
JH
708
709 /* we are at the beginning of the path component */
8558fd9e 710 if (ch == '.')
5f7b202a 711 return CHECK_REF_FORMAT_ERROR;
8558fd9e
DB
712 bad_type = bad_ref_char(ch);
713 if (bad_type) {
abd2bde7
DB
714 if (bad_type == 2 && (!*cp || *cp == '/') &&
715 ret == CHECK_REF_FORMAT_OK)
716 ret = CHECK_REF_FORMAT_WILDCARD;
717 else
718 return CHECK_REF_FORMAT_ERROR;
8558fd9e 719 }
03feddd6 720
cbdffe40 721 last = ch;
03feddd6
JH
722 /* scan the rest of the path component */
723 while ((ch = *cp++) != 0) {
8558fd9e 724 bad_type = bad_ref_char(ch);
cbdffe40 725 if (bad_type)
08fbdb30 726 return CHECK_REF_FORMAT_ERROR;
03feddd6
JH
727 if (ch == '/')
728 break;
cbdffe40
JH
729 if (last == '.' && ch == '.')
730 return CHECK_REF_FORMAT_ERROR;
731 if (last == '@' && ch == '{')
5f7b202a 732 return CHECK_REF_FORMAT_ERROR;
cbdffe40 733 last = ch;
03feddd6
JH
734 }
735 level++;
736 if (!ch) {
cbdffe40
JH
737 if (ref <= cp - 2 && cp[-2] == '.')
738 return CHECK_REF_FORMAT_ERROR;
03feddd6 739 if (level < 2)
5f7b202a 740 return CHECK_REF_FORMAT_ONELEVEL;
3e262b95
SP
741 if (has_extension(ref, ".lock"))
742 return CHECK_REF_FORMAT_ERROR;
abd2bde7 743 return ret;
03feddd6
JH
744 }
745 }
95fc7512
DB
746}
747
a9c37a72
DB
748const char *prettify_ref(const struct ref *ref)
749{
750 const char *name = ref->name;
751 return name + (
752 !prefixcmp(name, "refs/heads/") ? 11 :
753 !prefixcmp(name, "refs/tags/") ? 10 :
754 !prefixcmp(name, "refs/remotes/") ? 13 :
755 0);
756}
757
79803322
SP
758const char *ref_rev_parse_rules[] = {
759 "%.*s",
760 "refs/%.*s",
761 "refs/tags/%.*s",
762 "refs/heads/%.*s",
763 "refs/remotes/%.*s",
764 "refs/remotes/%.*s/HEAD",
765 NULL
766};
767
605b4978
SP
768const char *ref_fetch_rules[] = {
769 "%.*s",
770 "refs/%.*s",
771 "refs/heads/%.*s",
772 NULL
773};
774
79803322
SP
775int refname_match(const char *abbrev_name, const char *full_name, const char **rules)
776{
777 const char **p;
778 const int abbrev_name_len = strlen(abbrev_name);
779
780 for (p = rules; *p; p++) {
781 if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
782 return 1;
783 }
784 }
785
786 return 0;
787}
788
e5f38ec3 789static struct ref_lock *verify_lock(struct ref_lock *lock,
4bd18c43
SP
790 const unsigned char *old_sha1, int mustexist)
791{
8da19775 792 if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
434cd0cd 793 error("Can't verify ref %s", lock->ref_name);
4bd18c43
SP
794 unlock_ref(lock);
795 return NULL;
796 }
a89fccd2 797 if (hashcmp(lock->old_sha1, old_sha1)) {
434cd0cd 798 error("Ref %s is at %s but expected %s", lock->ref_name,
4bd18c43
SP
799 sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
800 unlock_ref(lock);
801 return NULL;
802 }
803 return lock;
804}
805
7155b727 806static int remove_empty_directories(const char *file)
bc7127ef
JH
807{
808 /* we want to create a file but there is a directory there;
809 * if that is an empty directory (or a directory that contains
810 * only empty directories), remove them.
811 */
7155b727
JS
812 struct strbuf path;
813 int result;
bc7127ef 814
7155b727
JS
815 strbuf_init(&path, 20);
816 strbuf_addstr(&path, file);
817
818 result = remove_dir_recursively(&path, 1);
819
820 strbuf_release(&path);
821
822 return result;
bc7127ef
JH
823}
824
c976d415
LH
825static int is_refname_available(const char *ref, const char *oldref,
826 struct ref_list *list, int quiet)
827{
828 int namlen = strlen(ref); /* e.g. 'foo/bar' */
829 while (list) {
830 /* list->name could be 'foo' or 'foo/bar/baz' */
831 if (!oldref || strcmp(oldref, list->name)) {
832 int len = strlen(list->name);
833 int cmplen = (namlen < len) ? namlen : len;
834 const char *lead = (namlen < len) ? list->name : ref;
835 if (!strncmp(ref, list->name, cmplen) &&
836 lead[cmplen] == '/') {
837 if (!quiet)
838 error("'%s' exists; cannot create '%s'",
839 list->name, ref);
840 return 0;
841 }
842 }
843 list = list->next;
844 }
845 return 1;
846}
847
68db31cc 848static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p)
4bd18c43 849{
434cd0cd 850 char *ref_file;
ed378ec7 851 const char *orig_ref = ref;
4bd18c43 852 struct ref_lock *lock;
5cc3cef9 853 int last_errno = 0;
acd3b9ec 854 int type, lflags;
4431fcc4 855 int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
5bdd8d4a 856 int missing = 0;
4bd18c43
SP
857
858 lock = xcalloc(1, sizeof(struct ref_lock));
859 lock->lock_fd = -1;
860
68db31cc 861 ref = resolve_ref(ref, lock->old_sha1, mustexist, &type);
bc7127ef
JH
862 if (!ref && errno == EISDIR) {
863 /* we are trying to lock foo but we used to
864 * have foo/bar which now does not exist;
865 * it is normal for the empty directory 'foo'
866 * to remain.
867 */
868 ref_file = git_path("%s", orig_ref);
5cc3cef9
JH
869 if (remove_empty_directories(ref_file)) {
870 last_errno = errno;
871 error("there are still refs under '%s'", orig_ref);
872 goto error_return;
873 }
68db31cc 874 ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type);
bc7127ef 875 }
68db31cc
SV
876 if (type_p)
877 *type_p = type;
ed378ec7 878 if (!ref) {
5cc3cef9 879 last_errno = errno;
818f477c 880 error("unable to resolve reference %s: %s",
ed378ec7 881 orig_ref, strerror(errno));
5cc3cef9 882 goto error_return;
4bd18c43 883 }
5bdd8d4a 884 missing = is_null_sha1(lock->old_sha1);
c976d415
LH
885 /* When the ref did not exist and we are creating it,
886 * make sure there is no existing ref that is packed
887 * whose name begins with our refname, nor a ref whose
888 * name is a proper prefix of our refname.
889 */
5bdd8d4a 890 if (missing &&
c976d415
LH
891 !is_refname_available(ref, NULL, get_packed_refs(), 0))
892 goto error_return;
22a3844e 893
c33d5174 894 lock->lk = xcalloc(1, sizeof(struct lock_file));
4bd18c43 895
acd3b9ec
JH
896 lflags = LOCK_DIE_ON_ERROR;
897 if (flags & REF_NODEREF) {
68db31cc 898 ref = orig_ref;
acd3b9ec
JH
899 lflags |= LOCK_NODEREF;
900 }
434cd0cd 901 lock->ref_name = xstrdup(ref);
1655707c 902 lock->orig_ref_name = xstrdup(orig_ref);
7c1a278d 903 ref_file = git_path("%s", ref);
5bdd8d4a 904 if (missing)
68db31cc
SV
905 lock->force_write = 1;
906 if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
907 lock->force_write = 1;
4bd18c43 908
5cc3cef9
JH
909 if (safe_create_leading_directories(ref_file)) {
910 last_errno = errno;
911 error("unable to create directory for %s", ref_file);
912 goto error_return;
913 }
4bd18c43 914
acd3b9ec 915 lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags);
4bd18c43 916 return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
5cc3cef9
JH
917
918 error_return:
919 unlock_ref(lock);
920 errno = last_errno;
921 return NULL;
4bd18c43
SP
922}
923
4431fcc4 924struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1)
95fc7512 925{
53cce84c 926 char refpath[PATH_MAX];
95fc7512 927 if (check_ref_format(ref))
4bd18c43 928 return NULL;
53cce84c 929 strcpy(refpath, mkpath("refs/%s", ref));
68db31cc 930 return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
4bd18c43
SP
931}
932
68db31cc 933struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags)
4bd18c43 934{
5f7b202a 935 switch (check_ref_format(ref)) {
5f7b202a 936 default:
257f3020
JH
937 return NULL;
938 case 0:
939 case CHECK_REF_FORMAT_ONELEVEL:
5f7b202a
JH
940 return lock_ref_sha1_basic(ref, old_sha1, flags, NULL);
941 }
c0277d15
JH
942}
943
26a063a1
JH
944static struct lock_file packlock;
945
c0277d15
JH
946static int repack_without_ref(const char *refname)
947{
948 struct ref_list *list, *packed_ref_list;
949 int fd;
950 int found = 0;
c0277d15
JH
951
952 packed_ref_list = get_packed_refs();
953 for (list = packed_ref_list; list; list = list->next) {
954 if (!strcmp(refname, list->name)) {
955 found = 1;
956 break;
957 }
958 }
959 if (!found)
960 return 0;
c0277d15
JH
961 fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
962 if (fd < 0)
963 return error("cannot delete '%s' from packed refs", refname);
964
965 for (list = packed_ref_list; list; list = list->next) {
966 char line[PATH_MAX + 100];
967 int len;
968
969 if (!strcmp(refname, list->name))
970 continue;
971 len = snprintf(line, sizeof(line), "%s %s\n",
972 sha1_to_hex(list->sha1), list->name);
973 /* this should not happen but just being defensive */
974 if (len > sizeof(line))
975 die("too long a refname '%s'", list->name);
976 write_or_die(fd, line, len);
977 }
978 return commit_lock_file(&packlock);
979}
980
eca35a25 981int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
c0277d15
JH
982{
983 struct ref_lock *lock;
eca35a25 984 int err, i = 0, ret = 0, flag = 0;
c0277d15 985
68db31cc 986 lock = lock_ref_sha1_basic(refname, sha1, 0, &flag);
c0277d15
JH
987 if (!lock)
988 return 1;
045a476f 989 if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
c0277d15 990 /* loose */
eca35a25
MV
991 const char *path;
992
993 if (!(delopt & REF_NODEREF)) {
994 i = strlen(lock->lk->filename) - 5; /* .lock */
995 lock->lk->filename[i] = 0;
996 path = lock->lk->filename;
997 } else {
9db56f71 998 path = git_path("%s", refname);
eca35a25
MV
999 }
1000 err = unlink(path);
0b294c0a 1001 if (err && errno != ENOENT) {
c0277d15
JH
1002 ret = 1;
1003 error("unlink(%s) failed: %s",
eca35a25 1004 path, strerror(errno));
c0277d15 1005 }
eca35a25
MV
1006 if (!(delopt & REF_NODEREF))
1007 lock->lk->filename[i] = '.';
c0277d15
JH
1008 }
1009 /* removing the loose one could have resurrected an earlier
1010 * packed one. Also, if it was not loose we need to repack
1011 * without it.
1012 */
1013 ret |= repack_without_ref(refname);
1014
9a13f0b7 1015 err = unlink(git_path("logs/%s", lock->ref_name));
c0277d15 1016 if (err && errno != ENOENT)
edbc25c5 1017 warning("unlink(%s) failed: %s",
9a13f0b7 1018 git_path("logs/%s", lock->ref_name), strerror(errno));
c0277d15
JH
1019 invalidate_cached_refs();
1020 unlock_ref(lock);
1021 return ret;
4bd18c43
SP
1022}
1023
678d0f4c 1024int rename_ref(const char *oldref, const char *newref, const char *logmsg)
c976d415
LH
1025{
1026 static const char renamed_ref[] = "RENAMED-REF";
1027 unsigned char sha1[20], orig_sha1[20];
1028 int flag = 0, logmoved = 0;
1029 struct ref_lock *lock;
c976d415 1030 struct stat loginfo;
16c2bfbb 1031 int log = !lstat(git_path("logs/%s", oldref), &loginfo);
eca35a25 1032 const char *symref = NULL;
c976d415 1033
450d4c0f 1034 if (log && S_ISLNK(loginfo.st_mode))
c976d415
LH
1035 return error("reflog for %s is a symlink", oldref);
1036
eca35a25
MV
1037 symref = resolve_ref(oldref, orig_sha1, 1, &flag);
1038 if (flag & REF_ISSYMREF)
fa58186c
MV
1039 return error("refname %s is a symbolic ref, renaming it is not supported",
1040 oldref);
eca35a25 1041 if (!symref)
c976d415
LH
1042 return error("refname %s not found", oldref);
1043
1044 if (!is_refname_available(newref, oldref, get_packed_refs(), 0))
1045 return 1;
1046
1047 if (!is_refname_available(newref, oldref, get_loose_refs(), 0))
1048 return 1;
1049
68db31cc 1050 lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL);
c976d415
LH
1051 if (!lock)
1052 return error("unable to lock %s", renamed_ref);
1053 lock->force_write = 1;
678d0f4c 1054 if (write_ref_sha1(lock, orig_sha1, logmsg))
c976d415
LH
1055 return error("unable to save current sha1 in %s", renamed_ref);
1056
1057 if (log && rename(git_path("logs/%s", oldref), git_path("tmp-renamed-log")))
1058 return error("unable to move logfile logs/%s to tmp-renamed-log: %s",
1059 oldref, strerror(errno));
1060
eca35a25 1061 if (delete_ref(oldref, orig_sha1, REF_NODEREF)) {
c976d415
LH
1062 error("unable to delete old %s", oldref);
1063 goto rollback;
1064 }
1065
eca35a25 1066 if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1, REF_NODEREF)) {
c976d415
LH
1067 if (errno==EISDIR) {
1068 if (remove_empty_directories(git_path("%s", newref))) {
1069 error("Directory not empty: %s", newref);
1070 goto rollback;
1071 }
1072 } else {
1073 error("unable to delete existing %s", newref);
1074 goto rollback;
1075 }
1076 }
1077
1078 if (log && safe_create_leading_directories(git_path("logs/%s", newref))) {
1079 error("unable to create directory for %s", newref);
1080 goto rollback;
1081 }
1082
1083 retry:
1084 if (log && rename(git_path("tmp-renamed-log"), git_path("logs/%s", newref))) {
d9e74d57
JR
1085 if (errno==EISDIR || errno==ENOTDIR) {
1086 /*
1087 * rename(a, b) when b is an existing
1088 * directory ought to result in ISDIR, but
1089 * Solaris 5.8 gives ENOTDIR. Sheesh.
1090 */
c976d415
LH
1091 if (remove_empty_directories(git_path("logs/%s", newref))) {
1092 error("Directory not empty: logs/%s", newref);
1093 goto rollback;
1094 }
1095 goto retry;
1096 } else {
1097 error("unable to move logfile tmp-renamed-log to logs/%s: %s",
1098 newref, strerror(errno));
1099 goto rollback;
1100 }
1101 }
1102 logmoved = log;
1103
68db31cc 1104 lock = lock_ref_sha1_basic(newref, NULL, 0, NULL);
c976d415
LH
1105 if (!lock) {
1106 error("unable to lock %s for update", newref);
1107 goto rollback;
1108 }
c976d415
LH
1109 lock->force_write = 1;
1110 hashcpy(lock->old_sha1, orig_sha1);
678d0f4c 1111 if (write_ref_sha1(lock, orig_sha1, logmsg)) {
c976d415
LH
1112 error("unable to write current sha1 into %s", newref);
1113 goto rollback;
1114 }
1115
1116 return 0;
1117
1118 rollback:
68db31cc 1119 lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL);
c976d415
LH
1120 if (!lock) {
1121 error("unable to lock %s for rollback", oldref);
1122 goto rollbacklog;
1123 }
1124
1125 lock->force_write = 1;
1126 flag = log_all_ref_updates;
1127 log_all_ref_updates = 0;
1128 if (write_ref_sha1(lock, orig_sha1, NULL))
1129 error("unable to write current sha1 into %s", oldref);
1130 log_all_ref_updates = flag;
1131
1132 rollbacklog:
1133 if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref)))
1134 error("unable to restore logfile %s from %s: %s",
1135 oldref, newref, strerror(errno));
1136 if (!logmoved && log &&
1137 rename(git_path("tmp-renamed-log"), git_path("logs/%s", oldref)))
1138 error("unable to restore logfile %s from tmp-renamed-log: %s",
1139 oldref, strerror(errno));
1140
1141 return 1;
1142}
1143
435fc852 1144int close_ref(struct ref_lock *lock)
b531394d
BC
1145{
1146 if (close_lock_file(lock->lk))
1147 return -1;
1148 lock->lock_fd = -1;
1149 return 0;
1150}
1151
435fc852 1152int commit_ref(struct ref_lock *lock)
b531394d
BC
1153{
1154 if (commit_lock_file(lock->lk))
1155 return -1;
1156 lock->lock_fd = -1;
1157 return 0;
1158}
1159
e5f38ec3 1160void unlock_ref(struct ref_lock *lock)
4bd18c43 1161{
4ed7cd3a
BC
1162 /* Do not free lock->lk -- atexit() still looks at them */
1163 if (lock->lk)
1164 rollback_lock_file(lock->lk);
434cd0cd 1165 free(lock->ref_name);
1655707c 1166 free(lock->orig_ref_name);
4bd18c43
SP
1167 free(lock);
1168}
1169
0ec29a47
JH
1170/*
1171 * copy the reflog message msg to buf, which has been allocated sufficiently
1172 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1173 * because reflog file is one line per entry.
1174 */
1175static int copy_msg(char *buf, const char *msg)
1176{
1177 char *cp = buf;
1178 char c;
1179 int wasspace = 1;
1180
1181 *cp++ = '\t';
1182 while ((c = *msg++)) {
1183 if (wasspace && isspace(c))
1184 continue;
1185 wasspace = isspace(c);
1186 if (wasspace)
1187 c = ' ';
1188 *cp++ = c;
1189 }
1190 while (buf < cp && isspace(cp[-1]))
1191 cp--;
1192 *cp++ = '\n';
1193 return cp - buf;
1194}
1195
9a13f0b7
NP
1196static int log_ref_write(const char *ref_name, const unsigned char *old_sha1,
1197 const unsigned char *new_sha1, const char *msg)
6de08ae6
SP
1198{
1199 int logfd, written, oflags = O_APPEND | O_WRONLY;
1200 unsigned maxlen, len;
8ac65937 1201 int msglen;
958a4789
AR
1202 char log_file[PATH_MAX];
1203 char *logrec;
ff4c8485 1204 const char *committer;
6de08ae6 1205
510c5a8e 1206 if (log_all_ref_updates < 0)
7d1864ce 1207 log_all_ref_updates = !is_bare_repository();
510c5a8e 1208
958a4789 1209 git_snpath(log_file, sizeof(log_file), "logs/%s", ref_name);
9a13f0b7 1210
4057deb5 1211 if (log_all_ref_updates &&
cc44c765
JH
1212 (!prefixcmp(ref_name, "refs/heads/") ||
1213 !prefixcmp(ref_name, "refs/remotes/") ||
bd104db1 1214 !strcmp(ref_name, "HEAD"))) {
9a13f0b7 1215 if (safe_create_leading_directories(log_file) < 0)
6de08ae6 1216 return error("unable to create directory for %s",
9a13f0b7 1217 log_file);
6de08ae6
SP
1218 oflags |= O_CREAT;
1219 }
1220
9a13f0b7 1221 logfd = open(log_file, oflags, 0666);
6de08ae6 1222 if (logfd < 0) {
1974bf62 1223 if (!(oflags & O_CREAT) && errno == ENOENT)
6de08ae6 1224 return 0;
3b463c3f
JH
1225
1226 if ((oflags & O_CREAT) && errno == EISDIR) {
9a13f0b7 1227 if (remove_empty_directories(log_file)) {
3b463c3f 1228 return error("There are still logs under '%s'",
9a13f0b7 1229 log_file);
3b463c3f 1230 }
9a13f0b7 1231 logfd = open(log_file, oflags, 0666);
3b463c3f
JH
1232 }
1233
1234 if (logfd < 0)
1235 return error("Unable to append to %s: %s",
9a13f0b7 1236 log_file, strerror(errno));
6de08ae6
SP
1237 }
1238
443b92b6
MK
1239 adjust_shared_perm(log_file);
1240
0ec29a47 1241 msglen = msg ? strlen(msg) : 0;
774751a8 1242 committer = git_committer_info(0);
8ac65937
JH
1243 maxlen = strlen(committer) + msglen + 100;
1244 logrec = xmalloc(maxlen);
1245 len = sprintf(logrec, "%s %s %s\n",
9a13f0b7
NP
1246 sha1_to_hex(old_sha1),
1247 sha1_to_hex(new_sha1),
8ac65937
JH
1248 committer);
1249 if (msglen)
0ec29a47 1250 len += copy_msg(logrec + len - 1, msg) - 1;
93822c22 1251 written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
6de08ae6 1252 free(logrec);
91c8d590 1253 if (close(logfd) != 0 || written != len)
9a13f0b7 1254 return error("Unable to append to %s", log_file);
6de08ae6
SP
1255 return 0;
1256}
1257
c3b0dec5
LT
1258static int is_branch(const char *refname)
1259{
1260 return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
1261}
1262
4bd18c43
SP
1263int write_ref_sha1(struct ref_lock *lock,
1264 const unsigned char *sha1, const char *logmsg)
1265{
1266 static char term = '\n';
c3b0dec5 1267 struct object *o;
4bd18c43
SP
1268
1269 if (!lock)
95fc7512 1270 return -1;
a89fccd2 1271 if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
4bd18c43
SP
1272 unlock_ref(lock);
1273 return 0;
95fc7512 1274 }
c3b0dec5
LT
1275 o = parse_object(sha1);
1276 if (!o) {
1277 error("Trying to write ref %s with nonexistant object %s",
1278 lock->ref_name, sha1_to_hex(sha1));
1279 unlock_ref(lock);
1280 return -1;
1281 }
1282 if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
1283 error("Trying to write non-commit object %s to branch %s",
1284 sha1_to_hex(sha1), lock->ref_name);
1285 unlock_ref(lock);
1286 return -1;
1287 }
93822c22
AW
1288 if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
1289 write_in_full(lock->lock_fd, &term, 1) != 1
b531394d 1290 || close_ref(lock) < 0) {
c33d5174 1291 error("Couldn't write %s", lock->lk->filename);
4bd18c43
SP
1292 unlock_ref(lock);
1293 return -1;
1294 }
5e290ff7 1295 invalidate_cached_refs();
bd104db1
NP
1296 if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
1297 (strcmp(lock->ref_name, lock->orig_ref_name) &&
1298 log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
6de08ae6
SP
1299 unlock_ref(lock);
1300 return -1;
1301 }
605fac8b
NP
1302 if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
1303 /*
1304 * Special hack: If a branch is updated directly and HEAD
1305 * points to it (may happen on the remote side of a push
1306 * for example) then logically the HEAD reflog should be
1307 * updated too.
1308 * A generic solution implies reverse symref information,
1309 * but finding all symrefs pointing to the given branch
1310 * would be rather costly for this rare event (the direct
1311 * update of a branch) to be worth it. So let's cheat and
1312 * check with HEAD only which should cover 99% of all usage
1313 * scenarios (even 100% of the default ones).
1314 */
1315 unsigned char head_sha1[20];
1316 int head_flag;
1317 const char *head_ref;
1318 head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag);
1319 if (head_ref && (head_flag & REF_ISSYMREF) &&
1320 !strcmp(head_ref, lock->ref_name))
1321 log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
1322 }
b531394d 1323 if (commit_ref(lock)) {
434cd0cd 1324 error("Couldn't set %s", lock->ref_name);
4bd18c43
SP
1325 unlock_ref(lock);
1326 return -1;
1327 }
4bd18c43
SP
1328 unlock_ref(lock);
1329 return 0;
95fc7512 1330}
d556fae2 1331
8b5157e4
NP
1332int create_symref(const char *ref_target, const char *refs_heads_master,
1333 const char *logmsg)
41b625b0
NP
1334{
1335 const char *lockpath;
1336 char ref[1000];
1337 int fd, len, written;
a4f34cbb 1338 char *git_HEAD = git_pathdup("%s", ref_target);
8b5157e4
NP
1339 unsigned char old_sha1[20], new_sha1[20];
1340
1341 if (logmsg && read_ref(ref_target, old_sha1))
1342 hashclr(old_sha1);
41b625b0 1343
d48744d1
JH
1344 if (safe_create_leading_directories(git_HEAD) < 0)
1345 return error("unable to create directory for %s", git_HEAD);
1346
41b625b0
NP
1347#ifndef NO_SYMLINK_HEAD
1348 if (prefer_symlink_refs) {
1349 unlink(git_HEAD);
1350 if (!symlink(refs_heads_master, git_HEAD))
8b5157e4 1351 goto done;
41b625b0
NP
1352 fprintf(stderr, "no symlink - falling back to symbolic ref\n");
1353 }
1354#endif
1355
1356 len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
1357 if (sizeof(ref) <= len) {
1358 error("refname too long: %s", refs_heads_master);
47fc52e2 1359 goto error_free_return;
41b625b0
NP
1360 }
1361 lockpath = mkpath("%s.lock", git_HEAD);
1362 fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
1363 if (fd < 0) {
1364 error("Unable to open %s for writing", lockpath);
47fc52e2 1365 goto error_free_return;
41b625b0
NP
1366 }
1367 written = write_in_full(fd, ref, len);
91c8d590 1368 if (close(fd) != 0 || written != len) {
41b625b0 1369 error("Unable to write to %s", lockpath);
47fc52e2 1370 goto error_unlink_return;
41b625b0
NP
1371 }
1372 if (rename(lockpath, git_HEAD) < 0) {
41b625b0 1373 error("Unable to create %s", git_HEAD);
47fc52e2 1374 goto error_unlink_return;
41b625b0
NP
1375 }
1376 if (adjust_shared_perm(git_HEAD)) {
41b625b0 1377 error("Unable to fix permissions on %s", lockpath);
47fc52e2
JH
1378 error_unlink_return:
1379 unlink(lockpath);
1380 error_free_return:
1381 free(git_HEAD);
1382 return -1;
41b625b0 1383 }
8b5157e4 1384
ee96d11b 1385#ifndef NO_SYMLINK_HEAD
8b5157e4 1386 done:
ee96d11b 1387#endif
8b5157e4
NP
1388 if (logmsg && !read_ref(refs_heads_master, new_sha1))
1389 log_ref_write(ref_target, old_sha1, new_sha1, logmsg);
1390
47fc52e2 1391 free(git_HEAD);
41b625b0
NP
1392 return 0;
1393}
1394
16d7cc90
JH
1395static char *ref_msg(const char *line, const char *endp)
1396{
1397 const char *ep;
16d7cc90 1398 line += 82;
182af834
PH
1399 ep = memchr(line, '\n', endp - line);
1400 if (!ep)
1401 ep = endp;
1402 return xmemdupz(line, ep - line);
16d7cc90
JH
1403}
1404
1405int 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 1406{
e5229042 1407 const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
d556fae2 1408 char *tz_c;
e29cb53a 1409 int logfd, tz, reccnt = 0;
d556fae2
SP
1410 struct stat st;
1411 unsigned long date;
e5229042 1412 unsigned char logged_sha1[20];
cb48cb58 1413 void *log_mapped;
dc49cd76 1414 size_t mapsz;
d556fae2
SP
1415
1416 logfile = git_path("logs/%s", ref);
1417 logfd = open(logfile, O_RDONLY, 0);
1418 if (logfd < 0)
1419 die("Unable to read log %s: %s", logfile, strerror(errno));
1420 fstat(logfd, &st);
1421 if (!st.st_size)
1422 die("Log %s is empty.", logfile);
dc49cd76
SP
1423 mapsz = xsize_t(st.st_size);
1424 log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0);
cb48cb58 1425 logdata = log_mapped;
d556fae2
SP
1426 close(logfd);
1427
e5229042 1428 lastrec = NULL;
d556fae2
SP
1429 rec = logend = logdata + st.st_size;
1430 while (logdata < rec) {
e29cb53a 1431 reccnt++;
d556fae2
SP
1432 if (logdata < rec && *(rec-1) == '\n')
1433 rec--;
e5229042
SP
1434 lastgt = NULL;
1435 while (logdata < rec && *(rec-1) != '\n') {
d556fae2 1436 rec--;
e5229042
SP
1437 if (*rec == '>')
1438 lastgt = rec;
1439 }
1440 if (!lastgt)
d556fae2 1441 die("Log %s is corrupt.", logfile);
e5229042 1442 date = strtoul(lastgt + 1, &tz_c, 10);
ab2a1a32 1443 if (date <= at_time || cnt == 0) {
76a44c5c 1444 tz = strtoul(tz_c, NULL, 10);
16d7cc90
JH
1445 if (msg)
1446 *msg = ref_msg(rec, logend);
1447 if (cutoff_time)
1448 *cutoff_time = date;
1449 if (cutoff_tz)
1450 *cutoff_tz = tz;
1451 if (cutoff_cnt)
76a44c5c 1452 *cutoff_cnt = reccnt - 1;
e5229042
SP
1453 if (lastrec) {
1454 if (get_sha1_hex(lastrec, logged_sha1))
1455 die("Log %s is corrupt.", logfile);
1456 if (get_sha1_hex(rec + 41, sha1))
1457 die("Log %s is corrupt.", logfile);
a89fccd2 1458 if (hashcmp(logged_sha1, sha1)) {
edbc25c5 1459 warning("Log %s has gap after %s.",
73013afd 1460 logfile, show_date(date, tz, DATE_RFC2822));
e5229042 1461 }
e5f38ec3
JH
1462 }
1463 else if (date == at_time) {
e5229042
SP
1464 if (get_sha1_hex(rec + 41, sha1))
1465 die("Log %s is corrupt.", logfile);
e5f38ec3
JH
1466 }
1467 else {
e5229042
SP
1468 if (get_sha1_hex(rec + 41, logged_sha1))
1469 die("Log %s is corrupt.", logfile);
a89fccd2 1470 if (hashcmp(logged_sha1, sha1)) {
edbc25c5 1471 warning("Log %s unexpectedly ended on %s.",
73013afd 1472 logfile, show_date(date, tz, DATE_RFC2822));
e5229042
SP
1473 }
1474 }
dc49cd76 1475 munmap(log_mapped, mapsz);
d556fae2
SP
1476 return 0;
1477 }
e5229042 1478 lastrec = rec;
ab2a1a32
JH
1479 if (cnt > 0)
1480 cnt--;
d556fae2
SP
1481 }
1482
e5229042
SP
1483 rec = logdata;
1484 while (rec < logend && *rec != '>' && *rec != '\n')
1485 rec++;
1486 if (rec == logend || *rec == '\n')
d556fae2 1487 die("Log %s is corrupt.", logfile);
e5229042 1488 date = strtoul(rec + 1, &tz_c, 10);
d556fae2
SP
1489 tz = strtoul(tz_c, NULL, 10);
1490 if (get_sha1_hex(logdata, sha1))
1491 die("Log %s is corrupt.", logfile);
d1a4489a
JK
1492 if (is_null_sha1(sha1)) {
1493 if (get_sha1_hex(logdata + 41, sha1))
1494 die("Log %s is corrupt.", logfile);
1495 }
16d7cc90
JH
1496 if (msg)
1497 *msg = ref_msg(logdata, logend);
dc49cd76 1498 munmap(log_mapped, mapsz);
16d7cc90
JH
1499
1500 if (cutoff_time)
1501 *cutoff_time = date;
1502 if (cutoff_tz)
1503 *cutoff_tz = tz;
1504 if (cutoff_cnt)
1505 *cutoff_cnt = reccnt;
1506 return 1;
d556fae2 1507}
2ff81662 1508
101d15e0 1509int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long ofs, void *cb_data)
2ff81662
JH
1510{
1511 const char *logfile;
1512 FILE *logfp;
1513 char buf[1024];
2266bf27 1514 int ret = 0;
2ff81662
JH
1515
1516 logfile = git_path("logs/%s", ref);
1517 logfp = fopen(logfile, "r");
1518 if (!logfp)
883d60fa 1519 return -1;
101d15e0
JH
1520
1521 if (ofs) {
1522 struct stat statbuf;
1523 if (fstat(fileno(logfp), &statbuf) ||
1524 statbuf.st_size < ofs ||
1525 fseek(logfp, -ofs, SEEK_END) ||
1526 fgets(buf, sizeof(buf), logfp))
1527 return -1;
1528 }
1529
2ff81662
JH
1530 while (fgets(buf, sizeof(buf), logfp)) {
1531 unsigned char osha1[20], nsha1[20];
883d60fa
JS
1532 char *email_end, *message;
1533 unsigned long timestamp;
2266bf27 1534 int len, tz;
2ff81662
JH
1535
1536 /* old SP new SP name <email> SP time TAB msg LF */
1537 len = strlen(buf);
1538 if (len < 83 || buf[len-1] != '\n' ||
1539 get_sha1_hex(buf, osha1) || buf[40] != ' ' ||
883d60fa
JS
1540 get_sha1_hex(buf + 41, nsha1) || buf[81] != ' ' ||
1541 !(email_end = strchr(buf + 82, '>')) ||
1542 email_end[1] != ' ' ||
1543 !(timestamp = strtoul(email_end + 2, &message, 10)) ||
1544 !message || message[0] != ' ' ||
1545 (message[1] != '+' && message[1] != '-') ||
1546 !isdigit(message[2]) || !isdigit(message[3]) ||
b4dd4856 1547 !isdigit(message[4]) || !isdigit(message[5]))
2ff81662 1548 continue; /* corrupt? */
883d60fa
JS
1549 email_end[1] = '\0';
1550 tz = strtol(message + 1, NULL, 10);
b4dd4856
JS
1551 if (message[6] != '\t')
1552 message += 6;
1553 else
1554 message += 7;
883d60fa
JS
1555 ret = fn(osha1, nsha1, buf+82, timestamp, tz, message, cb_data);
1556 if (ret)
2266bf27 1557 break;
2ff81662
JH
1558 }
1559 fclose(logfp);
2266bf27 1560 return ret;
2ff81662 1561}
e29cb53a 1562
101d15e0
JH
1563int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data)
1564{
1565 return for_each_recent_reflog_ent(ref, fn, 0, cb_data);
1566}
1567
eb8381c8
NP
1568static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data)
1569{
1570 DIR *dir = opendir(git_path("logs/%s", base));
fcee5a14 1571 int retval = 0;
eb8381c8
NP
1572
1573 if (dir) {
1574 struct dirent *de;
1575 int baselen = strlen(base);
1576 char *log = xmalloc(baselen + 257);
1577
1578 memcpy(log, base, baselen);
1579 if (baselen && base[baselen-1] != '/')
1580 log[baselen++] = '/';
1581
1582 while ((de = readdir(dir)) != NULL) {
1583 struct stat st;
1584 int namelen;
1585
1586 if (de->d_name[0] == '.')
1587 continue;
1588 namelen = strlen(de->d_name);
1589 if (namelen > 255)
1590 continue;
1591 if (has_extension(de->d_name, ".lock"))
1592 continue;
1593 memcpy(log + baselen, de->d_name, namelen+1);
1594 if (stat(git_path("logs/%s", log), &st) < 0)
1595 continue;
1596 if (S_ISDIR(st.st_mode)) {
1597 retval = do_for_each_reflog(log, fn, cb_data);
1598 } else {
1599 unsigned char sha1[20];
1600 if (!resolve_ref(log, sha1, 0, NULL))
1601 retval = error("bad ref for %s", log);
1602 else
1603 retval = fn(log, sha1, 0, cb_data);
1604 }
1605 if (retval)
1606 break;
1607 }
1608 free(log);
1609 closedir(dir);
1610 }
acb39f64 1611 else if (*base)
fcee5a14 1612 return errno;
eb8381c8
NP
1613 return retval;
1614}
1615
1616int for_each_reflog(each_ref_fn fn, void *cb_data)
1617{
1618 return do_for_each_reflog("", fn, cb_data);
1619}
3d9f037c
CR
1620
1621int update_ref(const char *action, const char *refname,
1622 const unsigned char *sha1, const unsigned char *oldval,
1623 int flags, enum action_on_err onerr)
1624{
1625 static struct ref_lock *lock;
1626 lock = lock_any_ref_for_update(refname, oldval, flags);
1627 if (!lock) {
1628 const char *str = "Cannot lock the ref '%s'.";
1629 switch (onerr) {
1630 case MSG_ON_ERR: error(str, refname); break;
1631 case DIE_ON_ERR: die(str, refname); break;
1632 case QUIET_ON_ERR: break;
1633 }
1634 return 1;
1635 }
1636 if (write_ref_sha1(lock, sha1, action) < 0) {
1637 const char *str = "Cannot update the ref '%s'.";
1638 switch (onerr) {
1639 case MSG_ON_ERR: error(str, refname); break;
1640 case DIE_ON_ERR: die(str, refname); break;
1641 case QUIET_ON_ERR: break;
1642 }
1643 return 1;
1644 }
1645 return 0;
1646}
cda69f48 1647
5483f799 1648struct ref *find_ref_by_name(const struct ref *list, const char *name)
cda69f48
JK
1649{
1650 for ( ; list; list = list->next)
1651 if (!strcmp(list->name, name))
5483f799 1652 return (struct ref *)list;
cda69f48
JK
1653 return NULL;
1654}