Update draft release notes to 1.7.8
[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
e01de1c9 9#define REF_BROKEN 010
f4204ab9 10
e9c4c111 11struct ref_entry {
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
e9c4c111
JP
18struct ref_array {
19 int nr, alloc;
20 struct ref_entry **refs;
21};
22
f4204ab9 23static const char *parse_ref_line(char *line, unsigned char *sha1)
e1e22e37
LT
24{
25 /*
26 * 42: the answer to everything.
27 *
28 * In this case, it happens to be the answer to
29 * 40 (length of sha1 hex representation)
30 * +1 (space in between hex and name)
31 * +1 (newline at the end of the line)
32 */
33 int len = strlen(line) - 42;
34
35 if (len <= 0)
36 return NULL;
37 if (get_sha1_hex(line, sha1) < 0)
38 return NULL;
39 if (!isspace(line[40]))
40 return NULL;
41 line += 41;
f4204ab9
JH
42 if (isspace(*line))
43 return NULL;
e1e22e37
LT
44 if (line[len] != '\n')
45 return NULL;
46 line[len] = 0;
cf0adba7 47
e1e22e37
LT
48 return line;
49}
50
e9c4c111
JP
51static void add_ref(const char *name, const unsigned char *sha1,
52 int flag, struct ref_array *refs,
53 struct ref_entry **new_entry)
e1e22e37
LT
54{
55 int len;
e9c4c111 56 struct ref_entry *entry;
e1e22e37
LT
57
58 /* Allocate it and add it in.. */
59 len = strlen(name) + 1;
e9c4c111 60 entry = xmalloc(sizeof(struct ref_entry) + len);
e1e22e37 61 hashcpy(entry->sha1, sha1);
f4204ab9 62 hashclr(entry->peeled);
dce4bab6
MH
63 if (check_refname_format(name, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT))
64 die("Reference has invalid format: '%s'", name);
e1e22e37 65 memcpy(entry->name, name, len);
8da19775 66 entry->flag = flag;
f4204ab9
JH
67 if (new_entry)
68 *new_entry = entry;
e9c4c111
JP
69 ALLOC_GROW(refs->refs, refs->nr + 1, refs->alloc);
70 refs->refs[refs->nr++] = entry;
c774aab9
JP
71}
72
e9c4c111 73static int ref_entry_cmp(const void *a, const void *b)
c774aab9 74{
e9c4c111
JP
75 struct ref_entry *one = *(struct ref_entry **)a;
76 struct ref_entry *two = *(struct ref_entry **)b;
77 return strcmp(one->name, two->name);
78}
c774aab9 79
e9c4c111
JP
80static void sort_ref_array(struct ref_array *array)
81{
82 int i = 0, j = 1;
c774aab9 83
e9c4c111
JP
84 /* Nothing to sort unless there are at least two entries */
85 if (array->nr < 2)
86 return;
c774aab9 87
e9c4c111 88 qsort(array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp);
c774aab9 89
e9c4c111
JP
90 /* Remove any duplicates from the ref_array */
91 for (; j < array->nr; j++) {
92 struct ref_entry *a = array->refs[i];
93 struct ref_entry *b = array->refs[j];
94 if (!strcmp(a->name, b->name)) {
95 if (hashcmp(a->sha1, b->sha1))
96 die("Duplicated ref, and SHA1s don't match: %s",
97 a->name);
98 warning("Duplicated ref: %s", a->name);
17d68a54 99 free(b);
e9c4c111
JP
100 continue;
101 }
102 i++;
103 array->refs[i] = array->refs[j];
104 }
105 array->nr = i + 1;
106}
c774aab9 107
e9c4c111
JP
108static struct ref_entry *search_ref_array(struct ref_array *array, const char *name)
109{
110 struct ref_entry *e, **r;
111 int len;
c774aab9 112
e9c4c111
JP
113 if (name == NULL)
114 return NULL;
c774aab9 115
68729696
BC
116 if (!array->nr)
117 return NULL;
c774aab9 118
e9c4c111
JP
119 len = strlen(name) + 1;
120 e = xmalloc(sizeof(struct ref_entry) + len);
121 memcpy(e->name, name, len);
c774aab9 122
e9c4c111 123 r = bsearch(&e, array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp);
c774aab9 124
e9c4c111 125 free(e);
c774aab9 126
e9c4c111
JP
127 if (r == NULL)
128 return NULL;
c774aab9 129
e9c4c111 130 return *r;
e1e22e37
LT
131}
132
5e290ff7
JH
133/*
134 * Future: need to be in "struct repository"
135 * when doing a full libification.
136 */
4175e9e3 137static struct cached_refs {
0e88c130 138 struct cached_refs *next;
5e290ff7
JH
139 char did_loose;
140 char did_packed;
e9c4c111
JP
141 struct ref_array loose;
142 struct ref_array packed;
ce40979c
MH
143 /* The submodule name, or "" for the main repo. */
144 char name[FLEX_ARRAY];
0e88c130
MH
145} *cached_refs;
146
e9c4c111 147static struct ref_entry *current_ref;
5e290ff7 148
e9c4c111 149static struct ref_array extra_refs;
e142a3c6 150
e9c4c111 151static void free_ref_array(struct ref_array *array)
5e290ff7 152{
e9c4c111
JP
153 int i;
154 for (i = 0; i < array->nr; i++)
155 free(array->refs[i]);
156 free(array->refs);
157 array->nr = array->alloc = 0;
158 array->refs = NULL;
5e290ff7
JH
159}
160
f130b116 161static void clear_cached_refs(struct cached_refs *ca)
e1e22e37 162{
e9c4c111
JP
163 if (ca->did_loose)
164 free_ref_array(&ca->loose);
165 if (ca->did_packed)
166 free_ref_array(&ca->packed);
5e290ff7
JH
167 ca->did_loose = ca->did_packed = 0;
168}
e1e22e37 169
3ab24efe 170static struct cached_refs *create_cached_refs(const char *submodule)
e5dbf605 171{
ce40979c 172 int len;
e5dbf605 173 struct cached_refs *refs;
ce40979c
MH
174 if (!submodule)
175 submodule = "";
176 len = strlen(submodule) + 1;
2c5c66be 177 refs = xcalloc(1, sizeof(struct cached_refs) + len);
ce40979c 178 memcpy(refs->name, submodule, len);
e5dbf605
MH
179 return refs;
180}
181
4349a668
MH
182/*
183 * Return a pointer to a cached_refs for the specified submodule. For
184 * the main repository, use submodule==NULL. The returned structure
185 * will be allocated and initialized but not necessarily populated; it
186 * should not be freed.
187 */
188static struct cached_refs *get_cached_refs(const char *submodule)
189{
0e88c130
MH
190 struct cached_refs *refs = cached_refs;
191 if (!submodule)
192 submodule = "";
193 while (refs) {
194 if (!strcmp(submodule, refs->name))
195 return refs;
196 refs = refs->next;
4349a668 197 }
0e88c130
MH
198
199 refs = create_cached_refs(submodule);
200 refs->next = cached_refs;
201 cached_refs = refs;
202 return refs;
4349a668
MH
203}
204
f130b116
MH
205static void invalidate_cached_refs(void)
206{
0e88c130
MH
207 struct cached_refs *refs = cached_refs;
208 while (refs) {
209 clear_cached_refs(refs);
210 refs = refs->next;
211 }
5e290ff7 212}
e1e22e37 213
2c5c66be 214static void read_packed_refs(FILE *f, struct ref_array *array)
f4204ab9 215{
e9c4c111 216 struct ref_entry *last = NULL;
f4204ab9
JH
217 char refline[PATH_MAX];
218 int flag = REF_ISPACKED;
219
220 while (fgets(refline, sizeof(refline), f)) {
221 unsigned char sha1[20];
222 const char *name;
223 static const char header[] = "# pack-refs with:";
224
225 if (!strncmp(refline, header, sizeof(header)-1)) {
226 const char *traits = refline + sizeof(header) - 1;
227 if (strstr(traits, " peeled "))
228 flag |= REF_KNOWS_PEELED;
229 /* perhaps other traits later as well */
230 continue;
231 }
232
233 name = parse_ref_line(refline, sha1);
234 if (name) {
2c5c66be 235 add_ref(name, sha1, flag, array, &last);
f4204ab9
JH
236 continue;
237 }
238 if (last &&
239 refline[0] == '^' &&
240 strlen(refline) == 42 &&
241 refline[41] == '\n' &&
242 !get_sha1_hex(refline + 1, sha1))
243 hashcpy(last->peeled, sha1);
244 }
2c5c66be 245 sort_ref_array(array);
f4204ab9
JH
246}
247
e142a3c6
DB
248void add_extra_ref(const char *name, const unsigned char *sha1, int flag)
249{
e9c4c111 250 add_ref(name, sha1, flag, &extra_refs, NULL);
e142a3c6
DB
251}
252
253void clear_extra_refs(void)
254{
e9c4c111 255 free_ref_array(&extra_refs);
e142a3c6
DB
256}
257
e9c4c111 258static struct ref_array *get_packed_refs(const char *submodule)
5e290ff7 259{
4349a668 260 struct cached_refs *refs = get_cached_refs(submodule);
0bad611b 261
4349a668
MH
262 if (!refs->did_packed) {
263 const char *packed_refs_file;
264 FILE *f;
0bad611b 265
4349a668
MH
266 if (submodule)
267 packed_refs_file = git_path_submodule(submodule, "packed-refs");
268 else
269 packed_refs_file = git_path("packed-refs");
270 f = fopen(packed_refs_file, "r");
e1e22e37 271 if (f) {
2c5c66be 272 read_packed_refs(f, &refs->packed);
e1e22e37 273 fclose(f);
e1e22e37 274 }
0bad611b 275 refs->did_packed = 1;
e1e22e37 276 }
e9c4c111 277 return &refs->packed;
e1e22e37
LT
278}
279
e9c4c111
JP
280static void get_ref_dir(const char *submodule, const char *base,
281 struct ref_array *array)
e1e22e37 282{
0bad611b
HV
283 DIR *dir;
284 const char *path;
285
286 if (submodule)
287 path = git_path_submodule(submodule, "%s", base);
288 else
289 path = git_path("%s", base);
290
291
292 dir = opendir(path);
e1e22e37
LT
293
294 if (dir) {
295 struct dirent *de;
296 int baselen = strlen(base);
ed378ec7 297 char *ref = xmalloc(baselen + 257);
e1e22e37 298
ed378ec7 299 memcpy(ref, base, baselen);
e1e22e37 300 if (baselen && base[baselen-1] != '/')
ed378ec7 301 ref[baselen++] = '/';
e1e22e37
LT
302
303 while ((de = readdir(dir)) != NULL) {
304 unsigned char sha1[20];
305 struct stat st;
8da19775 306 int flag;
e1e22e37 307 int namelen;
0bad611b 308 const char *refdir;
e1e22e37
LT
309
310 if (de->d_name[0] == '.')
311 continue;
312 namelen = strlen(de->d_name);
313 if (namelen > 255)
314 continue;
315 if (has_extension(de->d_name, ".lock"))
316 continue;
ed378ec7 317 memcpy(ref + baselen, de->d_name, namelen+1);
0bad611b
HV
318 refdir = submodule
319 ? git_path_submodule(submodule, "%s", ref)
320 : git_path("%s", ref);
321 if (stat(refdir, &st) < 0)
e1e22e37
LT
322 continue;
323 if (S_ISDIR(st.st_mode)) {
e9c4c111 324 get_ref_dir(submodule, ref, array);
e1e22e37
LT
325 continue;
326 }
0bad611b 327 if (submodule) {
f8948e2f 328 hashclr(sha1);
0bad611b
HV
329 flag = 0;
330 if (resolve_gitlink_ref(submodule, ref, sha1) < 0) {
331 hashclr(sha1);
332 flag |= REF_BROKEN;
333 }
334 } else
335 if (!resolve_ref(ref, sha1, 1, &flag)) {
336 hashclr(sha1);
337 flag |= REF_BROKEN;
338 }
e9c4c111 339 add_ref(ref, sha1, flag, array, NULL);
e1e22e37 340 }
ed378ec7 341 free(ref);
e1e22e37
LT
342 closedir(dir);
343 }
e1e22e37
LT
344}
345
f8948e2f 346struct warn_if_dangling_data {
3cf6134a 347 FILE *fp;
f8948e2f
JH
348 const char *refname;
349 const char *msg_fmt;
350};
351
352static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1,
353 int flags, void *cb_data)
354{
355 struct warn_if_dangling_data *d = cb_data;
356 const char *resolves_to;
357 unsigned char junk[20];
358
359 if (!(flags & REF_ISSYMREF))
360 return 0;
361
362 resolves_to = resolve_ref(refname, junk, 0, NULL);
363 if (!resolves_to || strcmp(resolves_to, d->refname))
364 return 0;
365
3cf6134a 366 fprintf(d->fp, d->msg_fmt, refname);
f8948e2f
JH
367 return 0;
368}
369
3cf6134a 370void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
f8948e2f 371{
66dbfd55
GV
372 struct warn_if_dangling_data data;
373
374 data.fp = fp;
375 data.refname = refname;
376 data.msg_fmt = msg_fmt;
f8948e2f
JH
377 for_each_rawref(warn_if_dangling_symref, &data);
378}
379
e9c4c111 380static struct ref_array *get_loose_refs(const char *submodule)
e1e22e37 381{
4349a668 382 struct cached_refs *refs = get_cached_refs(submodule);
0bad611b 383
4349a668 384 if (!refs->did_loose) {
2c5c66be
JH
385 get_ref_dir(submodule, "refs", &refs->loose);
386 sort_ref_array(&refs->loose);
4349a668 387 refs->did_loose = 1;
e1e22e37 388 }
2c5c66be 389 return &refs->loose;
e1e22e37
LT
390}
391
ca8db142
LT
392/* We allow "recursive" symbolic refs. Only within reason, though */
393#define MAXDEPTH 5
0ebde32c
LT
394#define MAXREFLEN (1024)
395
396static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result)
397{
e9c4c111 398 int retval = -1;
2c5c66be
JH
399 struct ref_entry *ref;
400 struct ref_array *array = get_packed_refs(name);
0ebde32c 401
2c5c66be 402 ref = search_ref_array(array, refname);
e9c4c111
JP
403 if (ref != NULL) {
404 memcpy(result, ref->sha1, 20);
405 retval = 0;
0ebde32c 406 }
0ebde32c
LT
407 return retval;
408}
409
410static int resolve_gitlink_ref_recursive(char *name, int pathlen, const char *refname, unsigned char *result, int recursion)
411{
412 int fd, len = strlen(refname);
413 char buffer[128], *p;
414
415 if (recursion > MAXDEPTH || len > MAXREFLEN)
416 return -1;
417 memcpy(name + pathlen, refname, len+1);
418 fd = open(name, O_RDONLY);
419 if (fd < 0)
420 return resolve_gitlink_packed_ref(name, pathlen, refname, result);
421
422 len = read(fd, buffer, sizeof(buffer)-1);
423 close(fd);
424 if (len < 0)
425 return -1;
426 while (len && isspace(buffer[len-1]))
427 len--;
428 buffer[len] = 0;
429
430 /* Was it a detached head or an old-fashioned symlink? */
431 if (!get_sha1_hex(buffer, result))
432 return 0;
433
434 /* Symref? */
435 if (strncmp(buffer, "ref:", 4))
436 return -1;
437 p = buffer + 4;
438 while (isspace(*p))
439 p++;
440
441 return resolve_gitlink_ref_recursive(name, pathlen, p, result, recursion+1);
442}
443
444int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *result)
445{
446 int len = strlen(path), retval;
447 char *gitdir;
842abf06 448 const char *tmp;
0ebde32c
LT
449
450 while (len && path[len-1] == '/')
451 len--;
452 if (!len)
453 return -1;
454 gitdir = xmalloc(len + MAXREFLEN + 8);
455 memcpy(gitdir, path, len);
842abf06
LH
456 memcpy(gitdir + len, "/.git", 6);
457 len += 5;
458
13d6ec91 459 tmp = read_gitfile(gitdir);
842abf06
LH
460 if (tmp) {
461 free(gitdir);
462 len = strlen(tmp);
463 gitdir = xmalloc(len + MAXREFLEN + 3);
464 memcpy(gitdir, tmp, len);
465 }
466 gitdir[len] = '/';
467 gitdir[++len] = '\0';
468 retval = resolve_gitlink_ref_recursive(gitdir, len, refname, result, 0);
0ebde32c
LT
469 free(gitdir);
470 return retval;
471}
ca8db142 472
4886b89f 473/*
c224ca7f
MH
474 * Try to read ref from the packed references. On success, set sha1
475 * and return 0; otherwise, return -1.
4886b89f 476 */
c224ca7f
MH
477static int get_packed_ref(const char *ref, unsigned char *sha1)
478{
2c5c66be
JH
479 struct ref_array *packed = get_packed_refs(NULL);
480 struct ref_entry *entry = search_ref_array(packed, ref);
481 if (entry) {
482 hashcpy(sha1, entry->sha1);
483 return 0;
c224ca7f
MH
484 }
485 return -1;
486}
487
8da19775 488const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag)
8a65ff76 489{
0104ca09
HO
490 int depth = MAXDEPTH;
491 ssize_t len;
a876ed83 492 char buffer[256];
ed378ec7 493 static char ref_buffer[256];
629cd3ac 494 char path[PATH_MAX];
ca8db142 495
8da19775
JH
496 if (flag)
497 *flag = 0;
498
8384d788
MH
499 if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL))
500 return NULL;
501
a876ed83
JH
502 for (;;) {
503 struct stat st;
504 char *buf;
505 int fd;
8a65ff76 506
a876ed83
JH
507 if (--depth < 0)
508 return NULL;
ca8db142 509
958a4789 510 git_snpath(path, sizeof(path), "%s", ref);
c224ca7f 511
a876ed83 512 if (lstat(path, &st) < 0) {
c224ca7f
MH
513 if (errno != ENOENT)
514 return NULL;
515 /*
516 * The loose reference file does not exist;
517 * check for a packed reference.
518 */
519 if (!get_packed_ref(ref, sha1)) {
520 if (flag)
521 *flag |= REF_ISPACKED;
522 return ref;
434cd0cd 523 }
c224ca7f
MH
524 /* The reference is not a packed reference, either. */
525 if (reading) {
a876ed83 526 return NULL;
c224ca7f
MH
527 } else {
528 hashclr(sha1);
529 return ref;
530 }
a876ed83 531 }
ca8db142 532
a876ed83
JH
533 /* Follow "normalized" - ie "refs/.." symlinks by hand */
534 if (S_ISLNK(st.st_mode)) {
535 len = readlink(path, buffer, sizeof(buffer)-1);
7bb2bf8e
MH
536 if (len < 0)
537 return NULL;
b54cb795 538 buffer[len] = 0;
1f58a038
MH
539 if (!prefixcmp(buffer, "refs/") &&
540 !check_refname_format(buffer, 0)) {
ed378ec7
LT
541 strcpy(ref_buffer, buffer);
542 ref = ref_buffer;
8da19775
JH
543 if (flag)
544 *flag |= REF_ISSYMREF;
a876ed83
JH
545 continue;
546 }
ca8db142 547 }
a876ed83 548
7a21632f
DS
549 /* Is it a directory? */
550 if (S_ISDIR(st.st_mode)) {
551 errno = EISDIR;
552 return NULL;
553 }
554
a876ed83
JH
555 /*
556 * Anything else, just open it and try to use it as
557 * a ref
558 */
559 fd = open(path, O_RDONLY);
560 if (fd < 0)
561 return NULL;
93d26e4c 562 len = read_in_full(fd, buffer, sizeof(buffer)-1);
a876ed83 563 close(fd);
28775050
MH
564 if (len < 0)
565 return NULL;
566 while (len && isspace(buffer[len-1]))
567 len--;
568 buffer[len] = '\0';
a876ed83
JH
569
570 /*
571 * Is it a symbolic ref?
572 */
28775050 573 if (prefixcmp(buffer, "ref:"))
a876ed83
JH
574 break;
575 buf = buffer + 4;
28775050
MH
576 while (isspace(*buf))
577 buf++;
313fb010
MH
578 if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) {
579 warning("symbolic reference in %s is formatted incorrectly",
580 path);
581 return NULL;
582 }
28775050 583 ref = strcpy(ref_buffer, buf);
8da19775
JH
584 if (flag)
585 *flag |= REF_ISSYMREF;
8a65ff76 586 }
f989fea0
MH
587 /* Please note that FETCH_HEAD has a second line containing other data. */
588 if (get_sha1_hex(buffer, sha1) || (buffer[40] != '\0' && !isspace(buffer[40]))) {
629cd3ac 589 warning("reference in %s is formatted incorrectly", path);
a876ed83 590 return NULL;
629cd3ac 591 }
ed378ec7 592 return ref;
a876ed83
JH
593}
594
d08bae7e
IL
595/* The argument to filter_refs */
596struct ref_filter {
597 const char *pattern;
598 each_ref_fn *fn;
599 void *cb_data;
600};
601
ed378ec7 602int read_ref(const char *ref, unsigned char *sha1)
a876ed83 603{
8da19775 604 if (resolve_ref(ref, sha1, 1, NULL))
a876ed83
JH
605 return 0;
606 return -1;
8a65ff76
LT
607}
608
f8948e2f 609#define DO_FOR_EACH_INCLUDE_BROKEN 01
ef06b918 610static int do_one_ref(const char *base, each_ref_fn fn, int trim,
e9c4c111 611 int flags, void *cb_data, struct ref_entry *entry)
ef06b918 612{
b3cfc406 613 if (prefixcmp(entry->name, base))
ef06b918 614 return 0;
e01de1c9 615
f8948e2f 616 if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) {
e01de1c9
JH
617 if (entry->flag & REF_BROKEN)
618 return 0; /* ignore dangling symref */
f8948e2f
JH
619 if (!has_sha1_file(entry->sha1)) {
620 error("%s does not point to a valid object!", entry->name);
621 return 0;
622 }
ef06b918 623 }
0ae91be0 624 current_ref = entry;
ef06b918
JH
625 return fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
626}
627
d08bae7e
IL
628static int filter_refs(const char *ref, const unsigned char *sha, int flags,
629 void *data)
630{
631 struct ref_filter *filter = (struct ref_filter *)data;
632 if (fnmatch(filter->pattern, ref, 0))
633 return 0;
634 return filter->fn(ref, sha, flags, filter->cb_data);
635}
636
cf0adba7
JH
637int peel_ref(const char *ref, unsigned char *sha1)
638{
639 int flag;
640 unsigned char base[20];
641 struct object *o;
642
0ae91be0
SP
643 if (current_ref && (current_ref->name == ref
644 || !strcmp(current_ref->name, ref))) {
645 if (current_ref->flag & REF_KNOWS_PEELED) {
646 hashcpy(sha1, current_ref->peeled);
647 return 0;
648 }
649 hashcpy(base, current_ref->sha1);
650 goto fallback;
651 }
652
cf0adba7
JH
653 if (!resolve_ref(ref, base, 1, &flag))
654 return -1;
655
656 if ((flag & REF_ISPACKED)) {
e9c4c111
JP
657 struct ref_array *array = get_packed_refs(NULL);
658 struct ref_entry *r = search_ref_array(array, ref);
cf0adba7 659
e9c4c111
JP
660 if (r != NULL && r->flag & REF_KNOWS_PEELED) {
661 hashcpy(sha1, r->peeled);
662 return 0;
cf0adba7 663 }
cf0adba7
JH
664 }
665
0ae91be0 666fallback:
cf0adba7 667 o = parse_object(base);
8c87dc77 668 if (o && o->type == OBJ_TAG) {
cf0adba7
JH
669 o = deref_tag(o, ref, 0);
670 if (o) {
671 hashcpy(sha1, o->sha1);
672 return 0;
673 }
674 }
675 return -1;
676}
677
0bad611b
HV
678static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn,
679 int trim, int flags, void *cb_data)
8a65ff76 680{
e9c4c111
JP
681 int retval = 0, i, p = 0, l = 0;
682 struct ref_array *packed = get_packed_refs(submodule);
683 struct ref_array *loose = get_loose_refs(submodule);
8a65ff76 684
e9c4c111 685 struct ref_array *extra = &extra_refs;
e142a3c6 686
e9c4c111
JP
687 for (i = 0; i < extra->nr; i++)
688 retval = do_one_ref(base, fn, trim, flags, cb_data, extra->refs[i]);
e142a3c6 689
e9c4c111
JP
690 while (p < packed->nr && l < loose->nr) {
691 struct ref_entry *entry;
692 int cmp = strcmp(packed->refs[p]->name, loose->refs[l]->name);
e1e22e37 693 if (!cmp) {
e9c4c111 694 p++;
e1e22e37 695 continue;
6cada6a9 696 }
e1e22e37 697 if (cmp > 0) {
e9c4c111 698 entry = loose->refs[l++];
e1e22e37 699 } else {
e9c4c111 700 entry = packed->refs[p++];
e1e22e37 701 }
f8948e2f 702 retval = do_one_ref(base, fn, trim, flags, cb_data, entry);
e1e22e37 703 if (retval)
0ae91be0 704 goto end_each;
e1e22e37 705 }
8a65ff76 706
e9c4c111
JP
707 if (l < loose->nr) {
708 p = l;
709 packed = loose;
710 }
711
712 for (; p < packed->nr; p++) {
713 retval = do_one_ref(base, fn, trim, flags, cb_data, packed->refs[p]);
ef06b918 714 if (retval)
0ae91be0 715 goto end_each;
8a65ff76 716 }
0ae91be0
SP
717
718end_each:
719 current_ref = NULL;
720 return retval;
8a65ff76
LT
721}
722
0bad611b
HV
723
724static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data)
723c31fe
LT
725{
726 unsigned char sha1[20];
8da19775
JH
727 int flag;
728
0bad611b
HV
729 if (submodule) {
730 if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0)
731 return fn("HEAD", sha1, 0, cb_data);
732
733 return 0;
734 }
735
8da19775
JH
736 if (resolve_ref("HEAD", sha1, 1, &flag))
737 return fn("HEAD", sha1, flag, cb_data);
0bad611b 738
2f34ba32 739 return 0;
723c31fe
LT
740}
741
0bad611b
HV
742int head_ref(each_ref_fn fn, void *cb_data)
743{
744 return do_head_ref(NULL, fn, cb_data);
745}
746
9ef6aeb0
HV
747int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
748{
749 return do_head_ref(submodule, fn, cb_data);
750}
751
cb5d709f 752int for_each_ref(each_ref_fn fn, void *cb_data)
8a65ff76 753{
b3cfc406 754 return do_for_each_ref(NULL, "", fn, 0, 0, cb_data);
a62be77f
SE
755}
756
9ef6aeb0
HV
757int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
758{
b3cfc406 759 return do_for_each_ref(submodule, "", fn, 0, 0, cb_data);
a62be77f
SE
760}
761
2a8177b6
CC
762int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
763{
0bad611b 764 return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data);
2a8177b6
CC
765}
766
9ef6aeb0
HV
767int for_each_ref_in_submodule(const char *submodule, const char *prefix,
768 each_ref_fn fn, void *cb_data)
769{
770 return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data);
2a8177b6
CC
771}
772
cb5d709f 773int for_each_tag_ref(each_ref_fn fn, void *cb_data)
a62be77f 774{
2a8177b6 775 return for_each_ref_in("refs/tags/", fn, cb_data);
a62be77f
SE
776}
777
9ef6aeb0
HV
778int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
779{
780 return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data);
781}
782
cb5d709f 783int for_each_branch_ref(each_ref_fn fn, void *cb_data)
a62be77f 784{
2a8177b6 785 return for_each_ref_in("refs/heads/", fn, cb_data);
a62be77f
SE
786}
787
9ef6aeb0
HV
788int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
789{
790 return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data);
791}
792
cb5d709f 793int for_each_remote_ref(each_ref_fn fn, void *cb_data)
a62be77f 794{
2a8177b6 795 return for_each_ref_in("refs/remotes/", fn, cb_data);
f8948e2f
JH
796}
797
9ef6aeb0
HV
798int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
799{
800 return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data);
801}
802
29268700
CC
803int for_each_replace_ref(each_ref_fn fn, void *cb_data)
804{
0bad611b 805 return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data);
29268700
CC
806}
807
a1bea2c1
JT
808int head_ref_namespaced(each_ref_fn fn, void *cb_data)
809{
810 struct strbuf buf = STRBUF_INIT;
811 int ret = 0;
812 unsigned char sha1[20];
813 int flag;
814
815 strbuf_addf(&buf, "%sHEAD", get_git_namespace());
816 if (resolve_ref(buf.buf, sha1, 1, &flag))
817 ret = fn(buf.buf, sha1, flag, cb_data);
818 strbuf_release(&buf);
819
820 return ret;
821}
822
823int for_each_namespaced_ref(each_ref_fn fn, void *cb_data)
824{
825 struct strbuf buf = STRBUF_INIT;
826 int ret;
827 strbuf_addf(&buf, "%srefs/", get_git_namespace());
828 ret = do_for_each_ref(NULL, buf.buf, fn, 0, 0, cb_data);
829 strbuf_release(&buf);
830 return ret;
831}
832
b09fe971
IL
833int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
834 const char *prefix, void *cb_data)
d08bae7e
IL
835{
836 struct strbuf real_pattern = STRBUF_INIT;
837 struct ref_filter filter;
d08bae7e
IL
838 int ret;
839
b09fe971 840 if (!prefix && prefixcmp(pattern, "refs/"))
d08bae7e 841 strbuf_addstr(&real_pattern, "refs/");
b09fe971
IL
842 else if (prefix)
843 strbuf_addstr(&real_pattern, prefix);
d08bae7e
IL
844 strbuf_addstr(&real_pattern, pattern);
845
894a9d33 846 if (!has_glob_specials(pattern)) {
9517e6b8 847 /* Append implied '/' '*' if not present. */
d08bae7e
IL
848 if (real_pattern.buf[real_pattern.len - 1] != '/')
849 strbuf_addch(&real_pattern, '/');
850 /* No need to check for '*', there is none. */
851 strbuf_addch(&real_pattern, '*');
852 }
853
854 filter.pattern = real_pattern.buf;
855 filter.fn = fn;
856 filter.cb_data = cb_data;
857 ret = for_each_ref(filter_refs, &filter);
858
859 strbuf_release(&real_pattern);
860 return ret;
861}
862
b09fe971
IL
863int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data)
864{
865 return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
866}
867
f8948e2f
JH
868int for_each_rawref(each_ref_fn fn, void *cb_data)
869{
b3cfc406 870 return do_for_each_ref(NULL, "", fn, 0,
f8948e2f 871 DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
8a65ff76
LT
872}
873
03feddd6
JH
874/*
875 * Make sure "ref" is something reasonable to have under ".git/refs/";
876 * We do not like it if:
877 *
878 * - any path component of it begins with ".", or
879 * - it has double dots "..", or
880 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
881 * - it ends with a "/".
3e262b95 882 * - it ends with ".lock"
a4c2e699 883 * - it contains a "\" (backslash)
03feddd6
JH
884 */
885
9224b73b 886/* Return true iff ch is not allowed in reference names. */
03feddd6
JH
887static inline int bad_ref_char(int ch)
888{
f3738c1c 889 if (((unsigned) ch) <= ' ' || ch == 0x7f ||
a4c2e699 890 ch == '~' || ch == '^' || ch == ':' || ch == '\\')
8558fd9e
DB
891 return 1;
892 /* 2.13 Pattern Matching Notation */
9224b73b 893 if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */
8558fd9e 894 return 1;
8558fd9e 895 return 0;
03feddd6
JH
896}
897
49295d4e
MH
898/*
899 * Try to read one refname component from the front of ref. Return
900 * the length of the component found, or -1 if the component is not
901 * legal.
902 */
dce4bab6 903static int check_refname_component(const char *ref, int flags)
95fc7512 904{
49295d4e
MH
905 const char *cp;
906 char last = '\0';
03feddd6 907
49295d4e
MH
908 for (cp = ref; ; cp++) {
909 char ch = *cp;
910 if (ch == '\0' || ch == '/')
911 break;
912 if (bad_ref_char(ch))
913 return -1; /* Illegal character in refname. */
914 if (last == '.' && ch == '.')
915 return -1; /* Refname contains "..". */
916 if (last == '@' && ch == '{')
917 return -1; /* Refname contains "@{". */
cbdffe40 918 last = ch;
49295d4e
MH
919 }
920 if (cp == ref)
921 return -1; /* Component has zero length. */
dce4bab6
MH
922 if (ref[0] == '.') {
923 if (!(flags & REFNAME_DOT_COMPONENT))
924 return -1; /* Component starts with '.'. */
925 /*
926 * Even if leading dots are allowed, don't allow "."
927 * as a component (".." is prevented by a rule above).
928 */
929 if (ref[1] == '\0')
930 return -1; /* Component equals ".". */
931 }
7e9d2fe9
MH
932 if (cp - ref >= 5 && !memcmp(cp - 5, ".lock", 5))
933 return -1; /* Refname ends with ".lock". */
49295d4e
MH
934 return cp - ref;
935}
936
8d9c5010 937int check_refname_format(const char *ref, int flags)
95fc7512 938{
49295d4e 939 int component_len, component_count = 0;
03feddd6 940
03feddd6 941 while (1) {
49295d4e 942 /* We are at the start of a path component. */
dce4bab6 943 component_len = check_refname_component(ref, flags);
49295d4e
MH
944 if (component_len < 0) {
945 if ((flags & REFNAME_REFSPEC_PATTERN) &&
946 ref[0] == '*' &&
947 (ref[1] == '\0' || ref[1] == '/')) {
8d9c5010
MH
948 /* Accept one wildcard as a full refname component. */
949 flags &= ~REFNAME_REFSPEC_PATTERN;
49295d4e
MH
950 component_len = 1;
951 } else {
8d9c5010 952 return -1;
49295d4e 953 }
03feddd6 954 }
49295d4e
MH
955 component_count++;
956 if (ref[component_len] == '\0')
957 break;
958 /* Skip to next component. */
959 ref += component_len + 1;
03feddd6 960 }
49295d4e
MH
961
962 if (ref[component_len - 1] == '.')
963 return -1; /* Refname ends with '.'. */
49295d4e
MH
964 if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2)
965 return -1; /* Refname has only one component. */
966 return 0;
95fc7512
DB
967}
968
4577e483 969const char *prettify_refname(const char *name)
a9c37a72 970{
a9c37a72
DB
971 return name + (
972 !prefixcmp(name, "refs/heads/") ? 11 :
973 !prefixcmp(name, "refs/tags/") ? 10 :
974 !prefixcmp(name, "refs/remotes/") ? 13 :
975 0);
976}
977
79803322
SP
978const char *ref_rev_parse_rules[] = {
979 "%.*s",
980 "refs/%.*s",
981 "refs/tags/%.*s",
982 "refs/heads/%.*s",
983 "refs/remotes/%.*s",
984 "refs/remotes/%.*s/HEAD",
985 NULL
986};
987
605b4978
SP
988const char *ref_fetch_rules[] = {
989 "%.*s",
990 "refs/%.*s",
991 "refs/heads/%.*s",
992 NULL
993};
994
79803322
SP
995int refname_match(const char *abbrev_name, const char *full_name, const char **rules)
996{
997 const char **p;
998 const int abbrev_name_len = strlen(abbrev_name);
999
1000 for (p = rules; *p; p++) {
1001 if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
1002 return 1;
1003 }
1004 }
1005
1006 return 0;
1007}
1008
e5f38ec3 1009static struct ref_lock *verify_lock(struct ref_lock *lock,
4bd18c43
SP
1010 const unsigned char *old_sha1, int mustexist)
1011{
8da19775 1012 if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
434cd0cd 1013 error("Can't verify ref %s", lock->ref_name);
4bd18c43
SP
1014 unlock_ref(lock);
1015 return NULL;
1016 }
a89fccd2 1017 if (hashcmp(lock->old_sha1, old_sha1)) {
434cd0cd 1018 error("Ref %s is at %s but expected %s", lock->ref_name,
4bd18c43
SP
1019 sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
1020 unlock_ref(lock);
1021 return NULL;
1022 }
1023 return lock;
1024}
1025
7155b727 1026static int remove_empty_directories(const char *file)
bc7127ef
JH
1027{
1028 /* we want to create a file but there is a directory there;
1029 * if that is an empty directory (or a directory that contains
1030 * only empty directories), remove them.
1031 */
7155b727
JS
1032 struct strbuf path;
1033 int result;
bc7127ef 1034
7155b727
JS
1035 strbuf_init(&path, 20);
1036 strbuf_addstr(&path, file);
1037
a0f4afbe 1038 result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY);
7155b727
JS
1039
1040 strbuf_release(&path);
1041
1042 return result;
bc7127ef
JH
1043}
1044
c976d415 1045static int is_refname_available(const char *ref, const char *oldref,
e9c4c111 1046 struct ref_array *array, int quiet)
c976d415 1047{
e9c4c111
JP
1048 int i, namlen = strlen(ref); /* e.g. 'foo/bar' */
1049 for (i = 0; i < array->nr; i++ ) {
1050 struct ref_entry *entry = array->refs[i];
1051 /* entry->name could be 'foo' or 'foo/bar/baz' */
1052 if (!oldref || strcmp(oldref, entry->name)) {
1053 int len = strlen(entry->name);
c976d415 1054 int cmplen = (namlen < len) ? namlen : len;
e9c4c111
JP
1055 const char *lead = (namlen < len) ? entry->name : ref;
1056 if (!strncmp(ref, entry->name, cmplen) &&
c976d415
LH
1057 lead[cmplen] == '/') {
1058 if (!quiet)
1059 error("'%s' exists; cannot create '%s'",
e9c4c111 1060 entry->name, ref);
c976d415
LH
1061 return 0;
1062 }
1063 }
c976d415
LH
1064 }
1065 return 1;
1066}
1067
68db31cc 1068static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int flags, int *type_p)
4bd18c43 1069{
434cd0cd 1070 char *ref_file;
ed378ec7 1071 const char *orig_ref = ref;
4bd18c43 1072 struct ref_lock *lock;
5cc3cef9 1073 int last_errno = 0;
acd3b9ec 1074 int type, lflags;
4431fcc4 1075 int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
5bdd8d4a 1076 int missing = 0;
4bd18c43
SP
1077
1078 lock = xcalloc(1, sizeof(struct ref_lock));
1079 lock->lock_fd = -1;
1080
68db31cc 1081 ref = resolve_ref(ref, lock->old_sha1, mustexist, &type);
bc7127ef
JH
1082 if (!ref && errno == EISDIR) {
1083 /* we are trying to lock foo but we used to
1084 * have foo/bar which now does not exist;
1085 * it is normal for the empty directory 'foo'
1086 * to remain.
1087 */
1088 ref_file = git_path("%s", orig_ref);
5cc3cef9
JH
1089 if (remove_empty_directories(ref_file)) {
1090 last_errno = errno;
1091 error("there are still refs under '%s'", orig_ref);
1092 goto error_return;
1093 }
68db31cc 1094 ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, &type);
bc7127ef 1095 }
68db31cc
SV
1096 if (type_p)
1097 *type_p = type;
ed378ec7 1098 if (!ref) {
5cc3cef9 1099 last_errno = errno;
818f477c 1100 error("unable to resolve reference %s: %s",
ed378ec7 1101 orig_ref, strerror(errno));
5cc3cef9 1102 goto error_return;
4bd18c43 1103 }
5bdd8d4a 1104 missing = is_null_sha1(lock->old_sha1);
c976d415
LH
1105 /* When the ref did not exist and we are creating it,
1106 * make sure there is no existing ref that is packed
1107 * whose name begins with our refname, nor a ref whose
1108 * name is a proper prefix of our refname.
1109 */
5bdd8d4a 1110 if (missing &&
0bad611b 1111 !is_refname_available(ref, NULL, get_packed_refs(NULL), 0)) {
f475e08e 1112 last_errno = ENOTDIR;
c976d415 1113 goto error_return;
f475e08e 1114 }
22a3844e 1115
c33d5174 1116 lock->lk = xcalloc(1, sizeof(struct lock_file));
4bd18c43 1117
acd3b9ec
JH
1118 lflags = LOCK_DIE_ON_ERROR;
1119 if (flags & REF_NODEREF) {
68db31cc 1120 ref = orig_ref;
acd3b9ec
JH
1121 lflags |= LOCK_NODEREF;
1122 }
434cd0cd 1123 lock->ref_name = xstrdup(ref);
1655707c 1124 lock->orig_ref_name = xstrdup(orig_ref);
7c1a278d 1125 ref_file = git_path("%s", ref);
5bdd8d4a 1126 if (missing)
68db31cc
SV
1127 lock->force_write = 1;
1128 if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
1129 lock->force_write = 1;
4bd18c43 1130
5cc3cef9
JH
1131 if (safe_create_leading_directories(ref_file)) {
1132 last_errno = errno;
1133 error("unable to create directory for %s", ref_file);
1134 goto error_return;
1135 }
4bd18c43 1136
acd3b9ec 1137 lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags);
4bd18c43 1138 return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
5cc3cef9
JH
1139
1140 error_return:
1141 unlock_ref(lock);
1142 errno = last_errno;
1143 return NULL;
4bd18c43
SP
1144}
1145
4431fcc4 1146struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1)
95fc7512 1147{
53cce84c 1148 char refpath[PATH_MAX];
8d9c5010 1149 if (check_refname_format(ref, 0))
4bd18c43 1150 return NULL;
53cce84c 1151 strcpy(refpath, mkpath("refs/%s", ref));
68db31cc 1152 return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
4bd18c43
SP
1153}
1154
68db31cc 1155struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1, int flags)
4bd18c43 1156{
8d9c5010 1157 if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL))
257f3020 1158 return NULL;
8d9c5010 1159 return lock_ref_sha1_basic(ref, old_sha1, flags, NULL);
c0277d15
JH
1160}
1161
26a063a1
JH
1162static struct lock_file packlock;
1163
c0277d15
JH
1164static int repack_without_ref(const char *refname)
1165{
e9c4c111
JP
1166 struct ref_array *packed;
1167 struct ref_entry *ref;
1168 int fd, i;
c0277d15 1169
e9c4c111
JP
1170 packed = get_packed_refs(NULL);
1171 ref = search_ref_array(packed, refname);
1172 if (ref == NULL)
c0277d15 1173 return 0;
c0277d15 1174 fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
1b018fd9
MV
1175 if (fd < 0) {
1176 unable_to_lock_error(git_path("packed-refs"), errno);
c0277d15 1177 return error("cannot delete '%s' from packed refs", refname);
1b018fd9 1178 }
c0277d15 1179
e9c4c111 1180 for (i = 0; i < packed->nr; i++) {
c0277d15
JH
1181 char line[PATH_MAX + 100];
1182 int len;
1183
e9c4c111
JP
1184 ref = packed->refs[i];
1185
1186 if (!strcmp(refname, ref->name))
c0277d15
JH
1187 continue;
1188 len = snprintf(line, sizeof(line), "%s %s\n",
e9c4c111 1189 sha1_to_hex(ref->sha1), ref->name);
c0277d15
JH
1190 /* this should not happen but just being defensive */
1191 if (len > sizeof(line))
e9c4c111 1192 die("too long a refname '%s'", ref->name);
c0277d15
JH
1193 write_or_die(fd, line, len);
1194 }
1195 return commit_lock_file(&packlock);
1196}
1197
eca35a25 1198int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
c0277d15
JH
1199{
1200 struct ref_lock *lock;
eca35a25 1201 int err, i = 0, ret = 0, flag = 0;
c0277d15 1202
68db31cc 1203 lock = lock_ref_sha1_basic(refname, sha1, 0, &flag);
c0277d15
JH
1204 if (!lock)
1205 return 1;
045a476f 1206 if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
c0277d15 1207 /* loose */
eca35a25
MV
1208 const char *path;
1209
1210 if (!(delopt & REF_NODEREF)) {
1211 i = strlen(lock->lk->filename) - 5; /* .lock */
1212 lock->lk->filename[i] = 0;
1213 path = lock->lk->filename;
1214 } else {
9db56f71 1215 path = git_path("%s", refname);
eca35a25 1216 }
691f1a28
AR
1217 err = unlink_or_warn(path);
1218 if (err && errno != ENOENT)
c0277d15 1219 ret = 1;
691f1a28 1220
eca35a25
MV
1221 if (!(delopt & REF_NODEREF))
1222 lock->lk->filename[i] = '.';
c0277d15
JH
1223 }
1224 /* removing the loose one could have resurrected an earlier
1225 * packed one. Also, if it was not loose we need to repack
1226 * without it.
1227 */
1228 ret |= repack_without_ref(refname);
1229
691f1a28 1230 unlink_or_warn(git_path("logs/%s", lock->ref_name));
c0277d15
JH
1231 invalidate_cached_refs();
1232 unlock_ref(lock);
1233 return ret;
4bd18c43
SP
1234}
1235
765c2258
PH
1236/*
1237 * People using contrib's git-new-workdir have .git/logs/refs ->
1238 * /some/other/path/.git/logs/refs, and that may live on another device.
1239 *
1240 * IOW, to avoid cross device rename errors, the temporary renamed log must
1241 * live into logs/refs.
1242 */
1243#define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1244
678d0f4c 1245int rename_ref(const char *oldref, const char *newref, const char *logmsg)
c976d415
LH
1246{
1247 static const char renamed_ref[] = "RENAMED-REF";
1248 unsigned char sha1[20], orig_sha1[20];
1249 int flag = 0, logmoved = 0;
1250 struct ref_lock *lock;
c976d415 1251 struct stat loginfo;
16c2bfbb 1252 int log = !lstat(git_path("logs/%s", oldref), &loginfo);
eca35a25 1253 const char *symref = NULL;
c976d415 1254
450d4c0f 1255 if (log && S_ISLNK(loginfo.st_mode))
c976d415
LH
1256 return error("reflog for %s is a symlink", oldref);
1257
eca35a25
MV
1258 symref = resolve_ref(oldref, orig_sha1, 1, &flag);
1259 if (flag & REF_ISSYMREF)
fa58186c
MV
1260 return error("refname %s is a symbolic ref, renaming it is not supported",
1261 oldref);
eca35a25 1262 if (!symref)
c976d415
LH
1263 return error("refname %s not found", oldref);
1264
0bad611b 1265 if (!is_refname_available(newref, oldref, get_packed_refs(NULL), 0))
c976d415
LH
1266 return 1;
1267
0bad611b 1268 if (!is_refname_available(newref, oldref, get_loose_refs(NULL), 0))
c976d415
LH
1269 return 1;
1270
68db31cc 1271 lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL);
c976d415
LH
1272 if (!lock)
1273 return error("unable to lock %s", renamed_ref);
1274 lock->force_write = 1;
678d0f4c 1275 if (write_ref_sha1(lock, orig_sha1, logmsg))
c976d415
LH
1276 return error("unable to save current sha1 in %s", renamed_ref);
1277
765c2258
PH
1278 if (log && rename(git_path("logs/%s", oldref), git_path(TMP_RENAMED_LOG)))
1279 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
c976d415
LH
1280 oldref, strerror(errno));
1281
eca35a25 1282 if (delete_ref(oldref, orig_sha1, REF_NODEREF)) {
c976d415
LH
1283 error("unable to delete old %s", oldref);
1284 goto rollback;
1285 }
1286
eca35a25 1287 if (resolve_ref(newref, sha1, 1, &flag) && delete_ref(newref, sha1, REF_NODEREF)) {
c976d415
LH
1288 if (errno==EISDIR) {
1289 if (remove_empty_directories(git_path("%s", newref))) {
1290 error("Directory not empty: %s", newref);
1291 goto rollback;
1292 }
1293 } else {
1294 error("unable to delete existing %s", newref);
1295 goto rollback;
1296 }
1297 }
1298
1299 if (log && safe_create_leading_directories(git_path("logs/%s", newref))) {
1300 error("unable to create directory for %s", newref);
1301 goto rollback;
1302 }
1303
1304 retry:
765c2258 1305 if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newref))) {
d9e74d57
JR
1306 if (errno==EISDIR || errno==ENOTDIR) {
1307 /*
1308 * rename(a, b) when b is an existing
1309 * directory ought to result in ISDIR, but
1310 * Solaris 5.8 gives ENOTDIR. Sheesh.
1311 */
c976d415
LH
1312 if (remove_empty_directories(git_path("logs/%s", newref))) {
1313 error("Directory not empty: logs/%s", newref);
1314 goto rollback;
1315 }
1316 goto retry;
1317 } else {
765c2258 1318 error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
c976d415
LH
1319 newref, strerror(errno));
1320 goto rollback;
1321 }
1322 }
1323 logmoved = log;
1324
68db31cc 1325 lock = lock_ref_sha1_basic(newref, NULL, 0, NULL);
c976d415
LH
1326 if (!lock) {
1327 error("unable to lock %s for update", newref);
1328 goto rollback;
1329 }
c976d415
LH
1330 lock->force_write = 1;
1331 hashcpy(lock->old_sha1, orig_sha1);
678d0f4c 1332 if (write_ref_sha1(lock, orig_sha1, logmsg)) {
c976d415
LH
1333 error("unable to write current sha1 into %s", newref);
1334 goto rollback;
1335 }
1336
1337 return 0;
1338
1339 rollback:
68db31cc 1340 lock = lock_ref_sha1_basic(oldref, NULL, 0, NULL);
c976d415
LH
1341 if (!lock) {
1342 error("unable to lock %s for rollback", oldref);
1343 goto rollbacklog;
1344 }
1345
1346 lock->force_write = 1;
1347 flag = log_all_ref_updates;
1348 log_all_ref_updates = 0;
1349 if (write_ref_sha1(lock, orig_sha1, NULL))
1350 error("unable to write current sha1 into %s", oldref);
1351 log_all_ref_updates = flag;
1352
1353 rollbacklog:
1354 if (logmoved && rename(git_path("logs/%s", newref), git_path("logs/%s", oldref)))
1355 error("unable to restore logfile %s from %s: %s",
1356 oldref, newref, strerror(errno));
1357 if (!logmoved && log &&
765c2258
PH
1358 rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldref)))
1359 error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s",
c976d415
LH
1360 oldref, strerror(errno));
1361
1362 return 1;
1363}
1364
435fc852 1365int close_ref(struct ref_lock *lock)
b531394d
BC
1366{
1367 if (close_lock_file(lock->lk))
1368 return -1;
1369 lock->lock_fd = -1;
1370 return 0;
1371}
1372
435fc852 1373int commit_ref(struct ref_lock *lock)
b531394d
BC
1374{
1375 if (commit_lock_file(lock->lk))
1376 return -1;
1377 lock->lock_fd = -1;
1378 return 0;
1379}
1380
e5f38ec3 1381void unlock_ref(struct ref_lock *lock)
4bd18c43 1382{
4ed7cd3a
BC
1383 /* Do not free lock->lk -- atexit() still looks at them */
1384 if (lock->lk)
1385 rollback_lock_file(lock->lk);
434cd0cd 1386 free(lock->ref_name);
1655707c 1387 free(lock->orig_ref_name);
4bd18c43
SP
1388 free(lock);
1389}
1390
0ec29a47
JH
1391/*
1392 * copy the reflog message msg to buf, which has been allocated sufficiently
1393 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1394 * because reflog file is one line per entry.
1395 */
1396static int copy_msg(char *buf, const char *msg)
1397{
1398 char *cp = buf;
1399 char c;
1400 int wasspace = 1;
1401
1402 *cp++ = '\t';
1403 while ((c = *msg++)) {
1404 if (wasspace && isspace(c))
1405 continue;
1406 wasspace = isspace(c);
1407 if (wasspace)
1408 c = ' ';
1409 *cp++ = c;
1410 }
1411 while (buf < cp && isspace(cp[-1]))
1412 cp--;
1413 *cp++ = '\n';
1414 return cp - buf;
1415}
1416
157aaea5 1417int log_ref_setup(const char *ref_name, char *logfile, int bufsize)
6de08ae6 1418{
859c3017 1419 int logfd, oflags = O_APPEND | O_WRONLY;
9a13f0b7 1420
157aaea5 1421 git_snpath(logfile, bufsize, "logs/%s", ref_name);
4057deb5 1422 if (log_all_ref_updates &&
cc44c765
JH
1423 (!prefixcmp(ref_name, "refs/heads/") ||
1424 !prefixcmp(ref_name, "refs/remotes/") ||
b2e256b0 1425 !prefixcmp(ref_name, "refs/notes/") ||
bd104db1 1426 !strcmp(ref_name, "HEAD"))) {
157aaea5 1427 if (safe_create_leading_directories(logfile) < 0)
6de08ae6 1428 return error("unable to create directory for %s",
157aaea5 1429 logfile);
6de08ae6
SP
1430 oflags |= O_CREAT;
1431 }
1432
157aaea5 1433 logfd = open(logfile, oflags, 0666);
6de08ae6 1434 if (logfd < 0) {
1974bf62 1435 if (!(oflags & O_CREAT) && errno == ENOENT)
6de08ae6 1436 return 0;
3b463c3f
JH
1437
1438 if ((oflags & O_CREAT) && errno == EISDIR) {
157aaea5 1439 if (remove_empty_directories(logfile)) {
3b463c3f 1440 return error("There are still logs under '%s'",
157aaea5 1441 logfile);
3b463c3f 1442 }
157aaea5 1443 logfd = open(logfile, oflags, 0666);
3b463c3f
JH
1444 }
1445
1446 if (logfd < 0)
1447 return error("Unable to append to %s: %s",
157aaea5 1448 logfile, strerror(errno));
6de08ae6
SP
1449 }
1450
157aaea5 1451 adjust_shared_perm(logfile);
859c3017
EM
1452 close(logfd);
1453 return 0;
1454}
443b92b6 1455
859c3017
EM
1456static int log_ref_write(const char *ref_name, const unsigned char *old_sha1,
1457 const unsigned char *new_sha1, const char *msg)
1458{
1459 int logfd, result, written, oflags = O_APPEND | O_WRONLY;
1460 unsigned maxlen, len;
1461 int msglen;
157aaea5 1462 char log_file[PATH_MAX];
859c3017
EM
1463 char *logrec;
1464 const char *committer;
1465
1466 if (log_all_ref_updates < 0)
1467 log_all_ref_updates = !is_bare_repository();
1468
157aaea5 1469 result = log_ref_setup(ref_name, log_file, sizeof(log_file));
859c3017
EM
1470 if (result)
1471 return result;
1472
1473 logfd = open(log_file, oflags);
1474 if (logfd < 0)
1475 return 0;
0ec29a47 1476 msglen = msg ? strlen(msg) : 0;
774751a8 1477 committer = git_committer_info(0);
8ac65937
JH
1478 maxlen = strlen(committer) + msglen + 100;
1479 logrec = xmalloc(maxlen);
1480 len = sprintf(logrec, "%s %s %s\n",
9a13f0b7
NP
1481 sha1_to_hex(old_sha1),
1482 sha1_to_hex(new_sha1),
8ac65937
JH
1483 committer);
1484 if (msglen)
0ec29a47 1485 len += copy_msg(logrec + len - 1, msg) - 1;
93822c22 1486 written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
6de08ae6 1487 free(logrec);
91c8d590 1488 if (close(logfd) != 0 || written != len)
9a13f0b7 1489 return error("Unable to append to %s", log_file);
6de08ae6
SP
1490 return 0;
1491}
1492
c3b0dec5
LT
1493static int is_branch(const char *refname)
1494{
1495 return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
1496}
1497
4bd18c43
SP
1498int write_ref_sha1(struct ref_lock *lock,
1499 const unsigned char *sha1, const char *logmsg)
1500{
1501 static char term = '\n';
c3b0dec5 1502 struct object *o;
4bd18c43
SP
1503
1504 if (!lock)
95fc7512 1505 return -1;
a89fccd2 1506 if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
4bd18c43
SP
1507 unlock_ref(lock);
1508 return 0;
95fc7512 1509 }
c3b0dec5
LT
1510 o = parse_object(sha1);
1511 if (!o) {
7be8b3ba 1512 error("Trying to write ref %s with nonexistent object %s",
c3b0dec5
LT
1513 lock->ref_name, sha1_to_hex(sha1));
1514 unlock_ref(lock);
1515 return -1;
1516 }
1517 if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
1518 error("Trying to write non-commit object %s to branch %s",
1519 sha1_to_hex(sha1), lock->ref_name);
1520 unlock_ref(lock);
1521 return -1;
1522 }
93822c22
AW
1523 if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
1524 write_in_full(lock->lock_fd, &term, 1) != 1
b531394d 1525 || close_ref(lock) < 0) {
c33d5174 1526 error("Couldn't write %s", lock->lk->filename);
4bd18c43
SP
1527 unlock_ref(lock);
1528 return -1;
1529 }
5e290ff7 1530 invalidate_cached_refs();
bd104db1
NP
1531 if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
1532 (strcmp(lock->ref_name, lock->orig_ref_name) &&
1533 log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
6de08ae6
SP
1534 unlock_ref(lock);
1535 return -1;
1536 }
605fac8b
NP
1537 if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
1538 /*
1539 * Special hack: If a branch is updated directly and HEAD
1540 * points to it (may happen on the remote side of a push
1541 * for example) then logically the HEAD reflog should be
1542 * updated too.
1543 * A generic solution implies reverse symref information,
1544 * but finding all symrefs pointing to the given branch
1545 * would be rather costly for this rare event (the direct
1546 * update of a branch) to be worth it. So let's cheat and
1547 * check with HEAD only which should cover 99% of all usage
1548 * scenarios (even 100% of the default ones).
1549 */
1550 unsigned char head_sha1[20];
1551 int head_flag;
1552 const char *head_ref;
1553 head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag);
1554 if (head_ref && (head_flag & REF_ISSYMREF) &&
1555 !strcmp(head_ref, lock->ref_name))
1556 log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
1557 }
b531394d 1558 if (commit_ref(lock)) {
434cd0cd 1559 error("Couldn't set %s", lock->ref_name);
4bd18c43
SP
1560 unlock_ref(lock);
1561 return -1;
1562 }
4bd18c43
SP
1563 unlock_ref(lock);
1564 return 0;
95fc7512 1565}
d556fae2 1566
8b5157e4
NP
1567int create_symref(const char *ref_target, const char *refs_heads_master,
1568 const char *logmsg)
41b625b0
NP
1569{
1570 const char *lockpath;
1571 char ref[1000];
1572 int fd, len, written;
a4f34cbb 1573 char *git_HEAD = git_pathdup("%s", ref_target);
8b5157e4
NP
1574 unsigned char old_sha1[20], new_sha1[20];
1575
1576 if (logmsg && read_ref(ref_target, old_sha1))
1577 hashclr(old_sha1);
41b625b0 1578
d48744d1
JH
1579 if (safe_create_leading_directories(git_HEAD) < 0)
1580 return error("unable to create directory for %s", git_HEAD);
1581
41b625b0
NP
1582#ifndef NO_SYMLINK_HEAD
1583 if (prefer_symlink_refs) {
1584 unlink(git_HEAD);
1585 if (!symlink(refs_heads_master, git_HEAD))
8b5157e4 1586 goto done;
41b625b0
NP
1587 fprintf(stderr, "no symlink - falling back to symbolic ref\n");
1588 }
1589#endif
1590
1591 len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
1592 if (sizeof(ref) <= len) {
1593 error("refname too long: %s", refs_heads_master);
47fc52e2 1594 goto error_free_return;
41b625b0
NP
1595 }
1596 lockpath = mkpath("%s.lock", git_HEAD);
1597 fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
1598 if (fd < 0) {
1599 error("Unable to open %s for writing", lockpath);
47fc52e2 1600 goto error_free_return;
41b625b0
NP
1601 }
1602 written = write_in_full(fd, ref, len);
91c8d590 1603 if (close(fd) != 0 || written != len) {
41b625b0 1604 error("Unable to write to %s", lockpath);
47fc52e2 1605 goto error_unlink_return;
41b625b0
NP
1606 }
1607 if (rename(lockpath, git_HEAD) < 0) {
41b625b0 1608 error("Unable to create %s", git_HEAD);
47fc52e2 1609 goto error_unlink_return;
41b625b0
NP
1610 }
1611 if (adjust_shared_perm(git_HEAD)) {
41b625b0 1612 error("Unable to fix permissions on %s", lockpath);
47fc52e2 1613 error_unlink_return:
691f1a28 1614 unlink_or_warn(lockpath);
47fc52e2
JH
1615 error_free_return:
1616 free(git_HEAD);
1617 return -1;
41b625b0 1618 }
8b5157e4 1619
ee96d11b 1620#ifndef NO_SYMLINK_HEAD
8b5157e4 1621 done:
ee96d11b 1622#endif
8b5157e4
NP
1623 if (logmsg && !read_ref(refs_heads_master, new_sha1))
1624 log_ref_write(ref_target, old_sha1, new_sha1, logmsg);
1625
47fc52e2 1626 free(git_HEAD);
41b625b0
NP
1627 return 0;
1628}
1629
16d7cc90
JH
1630static char *ref_msg(const char *line, const char *endp)
1631{
1632 const char *ep;
16d7cc90 1633 line += 82;
182af834
PH
1634 ep = memchr(line, '\n', endp - line);
1635 if (!ep)
1636 ep = endp;
1637 return xmemdupz(line, ep - line);
16d7cc90
JH
1638}
1639
1640int 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 1641{
e5229042 1642 const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
d556fae2 1643 char *tz_c;
e29cb53a 1644 int logfd, tz, reccnt = 0;
d556fae2
SP
1645 struct stat st;
1646 unsigned long date;
e5229042 1647 unsigned char logged_sha1[20];
cb48cb58 1648 void *log_mapped;
dc49cd76 1649 size_t mapsz;
d556fae2
SP
1650
1651 logfile = git_path("logs/%s", ref);
1652 logfd = open(logfile, O_RDONLY, 0);
1653 if (logfd < 0)
d824cbba 1654 die_errno("Unable to read log '%s'", logfile);
d556fae2
SP
1655 fstat(logfd, &st);
1656 if (!st.st_size)
1657 die("Log %s is empty.", logfile);
dc49cd76
SP
1658 mapsz = xsize_t(st.st_size);
1659 log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0);
cb48cb58 1660 logdata = log_mapped;
d556fae2
SP
1661 close(logfd);
1662
e5229042 1663 lastrec = NULL;
d556fae2
SP
1664 rec = logend = logdata + st.st_size;
1665 while (logdata < rec) {
e29cb53a 1666 reccnt++;
d556fae2
SP
1667 if (logdata < rec && *(rec-1) == '\n')
1668 rec--;
e5229042
SP
1669 lastgt = NULL;
1670 while (logdata < rec && *(rec-1) != '\n') {
d556fae2 1671 rec--;
e5229042
SP
1672 if (*rec == '>')
1673 lastgt = rec;
1674 }
1675 if (!lastgt)
d556fae2 1676 die("Log %s is corrupt.", logfile);
e5229042 1677 date = strtoul(lastgt + 1, &tz_c, 10);
ab2a1a32 1678 if (date <= at_time || cnt == 0) {
76a44c5c 1679 tz = strtoul(tz_c, NULL, 10);
16d7cc90
JH
1680 if (msg)
1681 *msg = ref_msg(rec, logend);
1682 if (cutoff_time)
1683 *cutoff_time = date;
1684 if (cutoff_tz)
1685 *cutoff_tz = tz;
1686 if (cutoff_cnt)
76a44c5c 1687 *cutoff_cnt = reccnt - 1;
e5229042
SP
1688 if (lastrec) {
1689 if (get_sha1_hex(lastrec, logged_sha1))
1690 die("Log %s is corrupt.", logfile);
1691 if (get_sha1_hex(rec + 41, sha1))
1692 die("Log %s is corrupt.", logfile);
a89fccd2 1693 if (hashcmp(logged_sha1, sha1)) {
edbc25c5 1694 warning("Log %s has gap after %s.",
73013afd 1695 logfile, show_date(date, tz, DATE_RFC2822));
e5229042 1696 }
e5f38ec3
JH
1697 }
1698 else if (date == at_time) {
e5229042
SP
1699 if (get_sha1_hex(rec + 41, sha1))
1700 die("Log %s is corrupt.", logfile);
e5f38ec3
JH
1701 }
1702 else {
e5229042
SP
1703 if (get_sha1_hex(rec + 41, logged_sha1))
1704 die("Log %s is corrupt.", logfile);
a89fccd2 1705 if (hashcmp(logged_sha1, sha1)) {
edbc25c5 1706 warning("Log %s unexpectedly ended on %s.",
73013afd 1707 logfile, show_date(date, tz, DATE_RFC2822));
e5229042
SP
1708 }
1709 }
dc49cd76 1710 munmap(log_mapped, mapsz);
d556fae2
SP
1711 return 0;
1712 }
e5229042 1713 lastrec = rec;
ab2a1a32
JH
1714 if (cnt > 0)
1715 cnt--;
d556fae2
SP
1716 }
1717
e5229042
SP
1718 rec = logdata;
1719 while (rec < logend && *rec != '>' && *rec != '\n')
1720 rec++;
1721 if (rec == logend || *rec == '\n')
d556fae2 1722 die("Log %s is corrupt.", logfile);
e5229042 1723 date = strtoul(rec + 1, &tz_c, 10);
d556fae2
SP
1724 tz = strtoul(tz_c, NULL, 10);
1725 if (get_sha1_hex(logdata, sha1))
1726 die("Log %s is corrupt.", logfile);
d1a4489a
JK
1727 if (is_null_sha1(sha1)) {
1728 if (get_sha1_hex(logdata + 41, sha1))
1729 die("Log %s is corrupt.", logfile);
1730 }
16d7cc90
JH
1731 if (msg)
1732 *msg = ref_msg(logdata, logend);
dc49cd76 1733 munmap(log_mapped, mapsz);
16d7cc90
JH
1734
1735 if (cutoff_time)
1736 *cutoff_time = date;
1737 if (cutoff_tz)
1738 *cutoff_tz = tz;
1739 if (cutoff_cnt)
1740 *cutoff_cnt = reccnt;
1741 return 1;
d556fae2 1742}
2ff81662 1743
101d15e0 1744int for_each_recent_reflog_ent(const char *ref, each_reflog_ent_fn fn, long ofs, void *cb_data)
2ff81662
JH
1745{
1746 const char *logfile;
1747 FILE *logfp;
8ca78803 1748 struct strbuf sb = STRBUF_INIT;
2266bf27 1749 int ret = 0;
2ff81662
JH
1750
1751 logfile = git_path("logs/%s", ref);
1752 logfp = fopen(logfile, "r");
1753 if (!logfp)
883d60fa 1754 return -1;
101d15e0
JH
1755
1756 if (ofs) {
1757 struct stat statbuf;
1758 if (fstat(fileno(logfp), &statbuf) ||
1759 statbuf.st_size < ofs ||
1760 fseek(logfp, -ofs, SEEK_END) ||
8ca78803 1761 strbuf_getwholeline(&sb, logfp, '\n')) {
9d33f7c2 1762 fclose(logfp);
8ca78803 1763 strbuf_release(&sb);
101d15e0 1764 return -1;
9d33f7c2 1765 }
101d15e0
JH
1766 }
1767
8ca78803 1768 while (!strbuf_getwholeline(&sb, logfp, '\n')) {
2ff81662 1769 unsigned char osha1[20], nsha1[20];
883d60fa
JS
1770 char *email_end, *message;
1771 unsigned long timestamp;
8ca78803 1772 int tz;
2ff81662
JH
1773
1774 /* old SP new SP name <email> SP time TAB msg LF */
8ca78803
RS
1775 if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' ||
1776 get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' ||
1777 get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' ||
1778 !(email_end = strchr(sb.buf + 82, '>')) ||
883d60fa
JS
1779 email_end[1] != ' ' ||
1780 !(timestamp = strtoul(email_end + 2, &message, 10)) ||
1781 !message || message[0] != ' ' ||
1782 (message[1] != '+' && message[1] != '-') ||
1783 !isdigit(message[2]) || !isdigit(message[3]) ||
b4dd4856 1784 !isdigit(message[4]) || !isdigit(message[5]))
2ff81662 1785 continue; /* corrupt? */
883d60fa
JS
1786 email_end[1] = '\0';
1787 tz = strtol(message + 1, NULL, 10);
b4dd4856
JS
1788 if (message[6] != '\t')
1789 message += 6;
1790 else
1791 message += 7;
8ca78803
RS
1792 ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message,
1793 cb_data);
883d60fa 1794 if (ret)
2266bf27 1795 break;
2ff81662
JH
1796 }
1797 fclose(logfp);
8ca78803 1798 strbuf_release(&sb);
2266bf27 1799 return ret;
2ff81662 1800}
e29cb53a 1801
101d15e0
JH
1802int for_each_reflog_ent(const char *ref, each_reflog_ent_fn fn, void *cb_data)
1803{
1804 return for_each_recent_reflog_ent(ref, fn, 0, cb_data);
1805}
1806
eb8381c8
NP
1807static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data)
1808{
1809 DIR *dir = opendir(git_path("logs/%s", base));
fcee5a14 1810 int retval = 0;
eb8381c8
NP
1811
1812 if (dir) {
1813 struct dirent *de;
1814 int baselen = strlen(base);
1815 char *log = xmalloc(baselen + 257);
1816
1817 memcpy(log, base, baselen);
1818 if (baselen && base[baselen-1] != '/')
1819 log[baselen++] = '/';
1820
1821 while ((de = readdir(dir)) != NULL) {
1822 struct stat st;
1823 int namelen;
1824
1825 if (de->d_name[0] == '.')
1826 continue;
1827 namelen = strlen(de->d_name);
1828 if (namelen > 255)
1829 continue;
1830 if (has_extension(de->d_name, ".lock"))
1831 continue;
1832 memcpy(log + baselen, de->d_name, namelen+1);
1833 if (stat(git_path("logs/%s", log), &st) < 0)
1834 continue;
1835 if (S_ISDIR(st.st_mode)) {
1836 retval = do_for_each_reflog(log, fn, cb_data);
1837 } else {
1838 unsigned char sha1[20];
1839 if (!resolve_ref(log, sha1, 0, NULL))
1840 retval = error("bad ref for %s", log);
1841 else
1842 retval = fn(log, sha1, 0, cb_data);
1843 }
1844 if (retval)
1845 break;
1846 }
1847 free(log);
1848 closedir(dir);
1849 }
acb39f64 1850 else if (*base)
fcee5a14 1851 return errno;
eb8381c8
NP
1852 return retval;
1853}
1854
1855int for_each_reflog(each_ref_fn fn, void *cb_data)
1856{
1857 return do_for_each_reflog("", fn, cb_data);
1858}
3d9f037c
CR
1859
1860int update_ref(const char *action, const char *refname,
1861 const unsigned char *sha1, const unsigned char *oldval,
1862 int flags, enum action_on_err onerr)
1863{
1864 static struct ref_lock *lock;
1865 lock = lock_any_ref_for_update(refname, oldval, flags);
1866 if (!lock) {
1867 const char *str = "Cannot lock the ref '%s'.";
1868 switch (onerr) {
1869 case MSG_ON_ERR: error(str, refname); break;
1870 case DIE_ON_ERR: die(str, refname); break;
1871 case QUIET_ON_ERR: break;
1872 }
1873 return 1;
1874 }
1875 if (write_ref_sha1(lock, sha1, action) < 0) {
1876 const char *str = "Cannot update the ref '%s'.";
1877 switch (onerr) {
1878 case MSG_ON_ERR: error(str, refname); break;
1879 case DIE_ON_ERR: die(str, refname); break;
1880 case QUIET_ON_ERR: break;
1881 }
1882 return 1;
1883 }
1884 return 0;
1885}
cda69f48 1886
2c5c66be 1887int ref_exists(const char *refname)
c17b2294
JH
1888{
1889 unsigned char sha1[20];
1890 return !!resolve_ref(refname, sha1, 1, NULL);
1891}
1892
5483f799 1893struct ref *find_ref_by_name(const struct ref *list, const char *name)
cda69f48
JK
1894{
1895 for ( ; list; list = list->next)
1896 if (!strcmp(list->name, name))
5483f799 1897 return (struct ref *)list;
cda69f48
JK
1898 return NULL;
1899}
7c2b3029
JK
1900
1901/*
1902 * generate a format suitable for scanf from a ref_rev_parse_rules
1903 * rule, that is replace the "%.*s" spec with a "%s" spec
1904 */
1905static void gen_scanf_fmt(char *scanf_fmt, const char *rule)
1906{
1907 char *spec;
1908
1909 spec = strstr(rule, "%.*s");
1910 if (!spec || strstr(spec + 4, "%.*s"))
1911 die("invalid rule in ref_rev_parse_rules: %s", rule);
1912
1913 /* copy all until spec */
1914 strncpy(scanf_fmt, rule, spec - rule);
1915 scanf_fmt[spec - rule] = '\0';
1916 /* copy new spec */
1917 strcat(scanf_fmt, "%s");
1918 /* copy remaining rule */
1919 strcat(scanf_fmt, spec + 4);
1920
1921 return;
1922}
1923
6e7b3309 1924char *shorten_unambiguous_ref(const char *ref, int strict)
7c2b3029
JK
1925{
1926 int i;
1927 static char **scanf_fmts;
1928 static int nr_rules;
1929 char *short_name;
1930
1931 /* pre generate scanf formats from ref_rev_parse_rules[] */
1932 if (!nr_rules) {
1933 size_t total_len = 0;
1934
1935 /* the rule list is NULL terminated, count them first */
1936 for (; ref_rev_parse_rules[nr_rules]; nr_rules++)
1937 /* no +1 because strlen("%s") < strlen("%.*s") */
1938 total_len += strlen(ref_rev_parse_rules[nr_rules]);
1939
1940 scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len);
1941
1942 total_len = 0;
1943 for (i = 0; i < nr_rules; i++) {
1944 scanf_fmts[i] = (char *)&scanf_fmts[nr_rules]
1945 + total_len;
1946 gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]);
1947 total_len += strlen(ref_rev_parse_rules[i]);
1948 }
1949 }
1950
1951 /* bail out if there are no rules */
1952 if (!nr_rules)
1953 return xstrdup(ref);
1954
1955 /* buffer for scanf result, at most ref must fit */
1956 short_name = xstrdup(ref);
1957
1958 /* skip first rule, it will always match */
1959 for (i = nr_rules - 1; i > 0 ; --i) {
1960 int j;
6e7b3309 1961 int rules_to_fail = i;
7c2b3029
JK
1962 int short_name_len;
1963
1964 if (1 != sscanf(ref, scanf_fmts[i], short_name))
1965 continue;
1966
1967 short_name_len = strlen(short_name);
1968
6e7b3309
BW
1969 /*
1970 * in strict mode, all (except the matched one) rules
1971 * must fail to resolve to a valid non-ambiguous ref
1972 */
1973 if (strict)
1974 rules_to_fail = nr_rules;
1975
7c2b3029
JK
1976 /*
1977 * check if the short name resolves to a valid ref,
1978 * but use only rules prior to the matched one
1979 */
6e7b3309 1980 for (j = 0; j < rules_to_fail; j++) {
7c2b3029
JK
1981 const char *rule = ref_rev_parse_rules[j];
1982 unsigned char short_objectname[20];
1983 char refname[PATH_MAX];
1984
6e7b3309
BW
1985 /* skip matched rule */
1986 if (i == j)
1987 continue;
1988
7c2b3029
JK
1989 /*
1990 * the short name is ambiguous, if it resolves
1991 * (with this previous rule) to a valid ref
1992 * read_ref() returns 0 on success
1993 */
1994 mksnpath(refname, sizeof(refname),
1995 rule, short_name_len, short_name);
1996 if (!read_ref(refname, short_objectname))
1997 break;
1998 }
1999
2000 /*
2001 * short name is non-ambiguous if all previous rules
2002 * haven't resolved to a valid ref
2003 */
6e7b3309 2004 if (j == rules_to_fail)
7c2b3029
JK
2005 return short_name;
2006 }
2007
2008 free(short_name);
2009 return xstrdup(ref);
2010}