is_dup_ref(): extract function from sort_ref_array()
[git/git.git] / refs.c
CommitLineData
95fc7512 1#include "cache.h"
85023577 2#include "refs.h"
cf0adba7
JH
3#include "object.h"
4#include "tag.h"
7155b727 5#include "dir.h"
95fc7512 6
98ac34b2
JH
7/* ISSYMREF=0x01, ISPACKED=0x02 and ISBROKEN=0x04 are public interfaces */
8#define REF_KNOWS_PEELED 0x10
f4204ab9 9
e9c4c111 10struct ref_entry {
f4204ab9 11 unsigned char flag; /* ISSYMREF? ISPACKED? */
e1e22e37 12 unsigned char sha1[20];
f4204ab9 13 unsigned char peeled[20];
c49b039b 14 /* The full name of the reference (e.g., "refs/heads/master"): */
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
fbd09e41
MH
23/*
24 * Parse one line from a packed-refs file. Write the SHA1 to sha1.
25 * Return a pointer to the refname within the line (null-terminated),
26 * or NULL if there was a problem.
27 */
f4204ab9 28static const char *parse_ref_line(char *line, unsigned char *sha1)
e1e22e37
LT
29{
30 /*
31 * 42: the answer to everything.
32 *
33 * In this case, it happens to be the answer to
34 * 40 (length of sha1 hex representation)
35 * +1 (space in between hex and name)
36 * +1 (newline at the end of the line)
37 */
38 int len = strlen(line) - 42;
39
40 if (len <= 0)
41 return NULL;
42 if (get_sha1_hex(line, sha1) < 0)
43 return NULL;
44 if (!isspace(line[40]))
45 return NULL;
46 line += 41;
f4204ab9
JH
47 if (isspace(*line))
48 return NULL;
e1e22e37
LT
49 if (line[len] != '\n')
50 return NULL;
51 line[len] = 0;
cf0adba7 52
e1e22e37
LT
53 return line;
54}
55
6af1038b 56/* Add a ref_entry to the end of the ref_array (unsorted). */
dfefa935 57static void add_ref(const char *refname, const unsigned char *sha1,
09116a1c 58 int flag, int check_name, struct ref_array *refs,
e9c4c111 59 struct ref_entry **new_entry)
e1e22e37
LT
60{
61 int len;
e9c4c111 62 struct ref_entry *entry;
e1e22e37
LT
63
64 /* Allocate it and add it in.. */
dfefa935 65 len = strlen(refname) + 1;
e9c4c111 66 entry = xmalloc(sizeof(struct ref_entry) + len);
e1e22e37 67 hashcpy(entry->sha1, sha1);
f4204ab9 68 hashclr(entry->peeled);
09116a1c 69 if (check_name &&
dfefa935
MH
70 check_refname_format(refname, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT))
71 die("Reference has invalid format: '%s'", refname);
72 memcpy(entry->name, refname, len);
8da19775 73 entry->flag = flag;
f4204ab9
JH
74 if (new_entry)
75 *new_entry = entry;
e9c4c111
JP
76 ALLOC_GROW(refs->refs, refs->nr + 1, refs->alloc);
77 refs->refs[refs->nr++] = entry;
c774aab9
JP
78}
79
e9c4c111 80static int ref_entry_cmp(const void *a, const void *b)
c774aab9 81{
e9c4c111
JP
82 struct ref_entry *one = *(struct ref_entry **)a;
83 struct ref_entry *two = *(struct ref_entry **)b;
84 return strcmp(one->name, two->name);
85}
c774aab9 86
202a56a9
MH
87/*
88 * Emit a warning and return true iff ref1 and ref2 have the same name
89 * and the same sha1. Die if they have the same name but different
90 * sha1s.
91 */
92static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2)
93{
94 if (!strcmp(ref1->name, ref2->name)) {
95 /* Duplicate name; make sure that the SHA1s match: */
96 if (hashcmp(ref1->sha1, ref2->sha1))
97 die("Duplicated ref, and SHA1s don't match: %s",
98 ref1->name);
99 warning("Duplicated ref: %s", ref1->name);
100 return 1;
101 } else {
102 return 0;
103 }
104}
105
e9c4c111
JP
106static void sort_ref_array(struct ref_array *array)
107{
202a56a9 108 int i, j;
c774aab9 109
e9c4c111
JP
110 /* Nothing to sort unless there are at least two entries */
111 if (array->nr < 2)
112 return;
c774aab9 113
e9c4c111 114 qsort(array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp);
c774aab9 115
e9c4c111 116 /* Remove any duplicates from the ref_array */
202a56a9
MH
117 i = 0;
118 for (j = 1; j < array->nr; j++) {
119 if (is_dup_ref(array->refs[i], array->refs[j])) {
120 free(array->refs[j]);
e9c4c111
JP
121 continue;
122 }
202a56a9 123 array->refs[++i] = array->refs[j];
e9c4c111
JP
124 }
125 array->nr = i + 1;
126}
c774aab9 127
dfefa935 128static struct ref_entry *search_ref_array(struct ref_array *array, const char *refname)
e9c4c111
JP
129{
130 struct ref_entry *e, **r;
131 int len;
c774aab9 132
dfefa935 133 if (refname == NULL)
e9c4c111 134 return NULL;
c774aab9 135
68729696
BC
136 if (!array->nr)
137 return NULL;
c774aab9 138
dfefa935 139 len = strlen(refname) + 1;
e9c4c111 140 e = xmalloc(sizeof(struct ref_entry) + len);
dfefa935 141 memcpy(e->name, refname, len);
c774aab9 142
e9c4c111 143 r = bsearch(&e, array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp);
c774aab9 144
e9c4c111 145 free(e);
c774aab9 146
e9c4c111
JP
147 if (r == NULL)
148 return NULL;
c774aab9 149
e9c4c111 150 return *r;
e1e22e37
LT
151}
152
5e290ff7
JH
153/*
154 * Future: need to be in "struct repository"
155 * when doing a full libification.
156 */
79c7ca54
MH
157static struct ref_cache {
158 struct ref_cache *next;
5e290ff7
JH
159 char did_loose;
160 char did_packed;
e9c4c111
JP
161 struct ref_array loose;
162 struct ref_array packed;
ce40979c
MH
163 /* The submodule name, or "" for the main repo. */
164 char name[FLEX_ARRAY];
79c7ca54 165} *ref_cache;
0e88c130 166
e9c4c111 167static struct ref_entry *current_ref;
5e290ff7 168
e9c4c111 169static struct ref_array extra_refs;
e142a3c6 170
7c59511e 171static void clear_ref_array(struct ref_array *array)
5e290ff7 172{
e9c4c111
JP
173 int i;
174 for (i = 0; i < array->nr; i++)
175 free(array->refs[i]);
176 free(array->refs);
177 array->nr = array->alloc = 0;
178 array->refs = NULL;
5e290ff7
JH
179}
180
760c4512 181static void clear_packed_ref_cache(struct ref_cache *refs)
e1e22e37 182{
1b7edaf9 183 if (refs->did_packed)
7c59511e 184 clear_ref_array(&refs->packed);
760c4512 185 refs->did_packed = 0;
5e290ff7 186}
e1e22e37 187
760c4512
MH
188static void clear_loose_ref_cache(struct ref_cache *refs)
189{
190 if (refs->did_loose)
7c59511e 191 clear_ref_array(&refs->loose);
760c4512
MH
192 refs->did_loose = 0;
193}
194
79c7ca54 195static struct ref_cache *create_ref_cache(const char *submodule)
e5dbf605 196{
ce40979c 197 int len;
79c7ca54 198 struct ref_cache *refs;
ce40979c
MH
199 if (!submodule)
200 submodule = "";
201 len = strlen(submodule) + 1;
79c7ca54 202 refs = xcalloc(1, sizeof(struct ref_cache) + len);
ce40979c 203 memcpy(refs->name, submodule, len);
e5dbf605
MH
204 return refs;
205}
206
4349a668 207/*
79c7ca54 208 * Return a pointer to a ref_cache for the specified submodule. For
4349a668
MH
209 * the main repository, use submodule==NULL. The returned structure
210 * will be allocated and initialized but not necessarily populated; it
211 * should not be freed.
212 */
79c7ca54 213static struct ref_cache *get_ref_cache(const char *submodule)
4349a668 214{
79c7ca54 215 struct ref_cache *refs = ref_cache;
0e88c130
MH
216 if (!submodule)
217 submodule = "";
218 while (refs) {
219 if (!strcmp(submodule, refs->name))
220 return refs;
221 refs = refs->next;
4349a668 222 }
0e88c130 223
79c7ca54
MH
224 refs = create_ref_cache(submodule);
225 refs->next = ref_cache;
226 ref_cache = refs;
0e88c130 227 return refs;
4349a668
MH
228}
229
8be8bde7 230void invalidate_ref_cache(const char *submodule)
f130b116 231{
c5f29abd
MH
232 struct ref_cache *refs = get_ref_cache(submodule);
233 clear_packed_ref_cache(refs);
234 clear_loose_ref_cache(refs);
5e290ff7 235}
e1e22e37 236
2c5c66be 237static void read_packed_refs(FILE *f, struct ref_array *array)
f4204ab9 238{
e9c4c111 239 struct ref_entry *last = NULL;
f4204ab9
JH
240 char refline[PATH_MAX];
241 int flag = REF_ISPACKED;
242
243 while (fgets(refline, sizeof(refline), f)) {
244 unsigned char sha1[20];
dfefa935 245 const char *refname;
f4204ab9
JH
246 static const char header[] = "# pack-refs with:";
247
248 if (!strncmp(refline, header, sizeof(header)-1)) {
249 const char *traits = refline + sizeof(header) - 1;
250 if (strstr(traits, " peeled "))
251 flag |= REF_KNOWS_PEELED;
252 /* perhaps other traits later as well */
253 continue;
254 }
255
dfefa935
MH
256 refname = parse_ref_line(refline, sha1);
257 if (refname) {
258 add_ref(refname, sha1, flag, 1, array, &last);
f4204ab9
JH
259 continue;
260 }
261 if (last &&
262 refline[0] == '^' &&
263 strlen(refline) == 42 &&
264 refline[41] == '\n' &&
265 !get_sha1_hex(refline + 1, sha1))
266 hashcpy(last->peeled, sha1);
267 }
2c5c66be 268 sort_ref_array(array);
f4204ab9
JH
269}
270
dfefa935 271void add_extra_ref(const char *refname, const unsigned char *sha1, int flag)
e142a3c6 272{
dfefa935 273 add_ref(refname, sha1, flag, 0, &extra_refs, NULL);
e142a3c6
DB
274}
275
276void clear_extra_refs(void)
277{
7c59511e 278 clear_ref_array(&extra_refs);
e142a3c6
DB
279}
280
e9c4c111 281static struct ref_array *get_packed_refs(const char *submodule)
5e290ff7 282{
79c7ca54 283 struct ref_cache *refs = get_ref_cache(submodule);
0bad611b 284
4349a668
MH
285 if (!refs->did_packed) {
286 const char *packed_refs_file;
287 FILE *f;
0bad611b 288
4349a668
MH
289 if (submodule)
290 packed_refs_file = git_path_submodule(submodule, "packed-refs");
291 else
292 packed_refs_file = git_path("packed-refs");
293 f = fopen(packed_refs_file, "r");
e1e22e37 294 if (f) {
2c5c66be 295 read_packed_refs(f, &refs->packed);
e1e22e37 296 fclose(f);
e1e22e37 297 }
0bad611b 298 refs->did_packed = 1;
e1e22e37 299 }
e9c4c111 300 return &refs->packed;
e1e22e37
LT
301}
302
e9c4c111
JP
303static void get_ref_dir(const char *submodule, const char *base,
304 struct ref_array *array)
e1e22e37 305{
0bad611b
HV
306 DIR *dir;
307 const char *path;
308
309 if (submodule)
310 path = git_path_submodule(submodule, "%s", base);
311 else
312 path = git_path("%s", base);
313
314
315 dir = opendir(path);
e1e22e37
LT
316
317 if (dir) {
318 struct dirent *de;
319 int baselen = strlen(base);
dfefa935 320 char *refname = xmalloc(baselen + 257);
e1e22e37 321
dfefa935 322 memcpy(refname, base, baselen);
e1e22e37 323 if (baselen && base[baselen-1] != '/')
dfefa935 324 refname[baselen++] = '/';
e1e22e37
LT
325
326 while ((de = readdir(dir)) != NULL) {
327 unsigned char sha1[20];
328 struct stat st;
8da19775 329 int flag;
e1e22e37 330 int namelen;
0bad611b 331 const char *refdir;
e1e22e37
LT
332
333 if (de->d_name[0] == '.')
334 continue;
335 namelen = strlen(de->d_name);
336 if (namelen > 255)
337 continue;
338 if (has_extension(de->d_name, ".lock"))
339 continue;
dfefa935 340 memcpy(refname + baselen, de->d_name, namelen+1);
0bad611b 341 refdir = submodule
dfefa935
MH
342 ? git_path_submodule(submodule, "%s", refname)
343 : git_path("%s", refname);
0bad611b 344 if (stat(refdir, &st) < 0)
e1e22e37
LT
345 continue;
346 if (S_ISDIR(st.st_mode)) {
dfefa935 347 get_ref_dir(submodule, refname, array);
e1e22e37
LT
348 continue;
349 }
0bad611b 350 if (submodule) {
f8948e2f 351 hashclr(sha1);
0bad611b 352 flag = 0;
dfefa935 353 if (resolve_gitlink_ref(submodule, refname, sha1) < 0) {
0bad611b 354 hashclr(sha1);
98ac34b2 355 flag |= REF_ISBROKEN;
0bad611b 356 }
dfefa935 357 } else if (read_ref_full(refname, sha1, 1, &flag)) {
09116a1c
JH
358 hashclr(sha1);
359 flag |= REF_ISBROKEN;
360 }
dfefa935 361 add_ref(refname, sha1, flag, 1, array, NULL);
e1e22e37 362 }
dfefa935 363 free(refname);
e1e22e37
LT
364 closedir(dir);
365 }
e1e22e37
LT
366}
367
f8948e2f 368struct warn_if_dangling_data {
3cf6134a 369 FILE *fp;
f8948e2f
JH
370 const char *refname;
371 const char *msg_fmt;
372};
373
374static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1,
375 int flags, void *cb_data)
376{
377 struct warn_if_dangling_data *d = cb_data;
378 const char *resolves_to;
379 unsigned char junk[20];
380
381 if (!(flags & REF_ISSYMREF))
382 return 0;
383
384 resolves_to = resolve_ref(refname, junk, 0, NULL);
385 if (!resolves_to || strcmp(resolves_to, d->refname))
386 return 0;
387
3cf6134a 388 fprintf(d->fp, d->msg_fmt, refname);
f8948e2f
JH
389 return 0;
390}
391
3cf6134a 392void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
f8948e2f 393{
66dbfd55
GV
394 struct warn_if_dangling_data data;
395
396 data.fp = fp;
397 data.refname = refname;
398 data.msg_fmt = msg_fmt;
f8948e2f
JH
399 for_each_rawref(warn_if_dangling_symref, &data);
400}
401
e9c4c111 402static struct ref_array *get_loose_refs(const char *submodule)
e1e22e37 403{
79c7ca54 404 struct ref_cache *refs = get_ref_cache(submodule);
0bad611b 405
4349a668 406 if (!refs->did_loose) {
2c5c66be
JH
407 get_ref_dir(submodule, "refs", &refs->loose);
408 sort_ref_array(&refs->loose);
4349a668 409 refs->did_loose = 1;
e1e22e37 410 }
2c5c66be 411 return &refs->loose;
e1e22e37
LT
412}
413
ca8db142
LT
414/* We allow "recursive" symbolic refs. Only within reason, though */
415#define MAXDEPTH 5
0ebde32c
LT
416#define MAXREFLEN (1024)
417
e5fa45c1
JH
418/*
419 * Called by resolve_gitlink_ref_recursive() after it failed to read
420 * from "name", which is "module/.git/<refname>". Find <refname> in
421 * the packed-refs file for the submodule.
422 */
dfefa935 423static int resolve_gitlink_packed_ref(char *name, int pathlen,
85be1fe3 424 const char *refname, unsigned char *sha1)
0ebde32c 425{
e9c4c111 426 int retval = -1;
2c5c66be 427 struct ref_entry *ref;
e5fa45c1 428 struct ref_array *array;
0ebde32c 429
e5fa45c1
JH
430 /* being defensive: resolve_gitlink_ref() did this for us */
431 if (pathlen < 6 || memcmp(name + pathlen - 6, "/.git/", 6))
432 die("Oops");
433 name[pathlen - 6] = '\0'; /* make it path to the submodule */
434 array = get_packed_refs(name);
2c5c66be 435 ref = search_ref_array(array, refname);
e9c4c111 436 if (ref != NULL) {
85be1fe3 437 memcpy(sha1, ref->sha1, 20);
e9c4c111 438 retval = 0;
0ebde32c 439 }
0ebde32c
LT
440 return retval;
441}
442
dfefa935 443static int resolve_gitlink_ref_recursive(char *name, int pathlen,
85be1fe3 444 const char *refname, unsigned char *sha1,
dfefa935 445 int recursion)
0ebde32c
LT
446{
447 int fd, len = strlen(refname);
448 char buffer[128], *p;
449
450 if (recursion > MAXDEPTH || len > MAXREFLEN)
451 return -1;
452 memcpy(name + pathlen, refname, len+1);
453 fd = open(name, O_RDONLY);
454 if (fd < 0)
85be1fe3 455 return resolve_gitlink_packed_ref(name, pathlen, refname, sha1);
0ebde32c
LT
456
457 len = read(fd, buffer, sizeof(buffer)-1);
458 close(fd);
459 if (len < 0)
460 return -1;
461 while (len && isspace(buffer[len-1]))
462 len--;
463 buffer[len] = 0;
464
465 /* Was it a detached head or an old-fashioned symlink? */
85be1fe3 466 if (!get_sha1_hex(buffer, sha1))
0ebde32c
LT
467 return 0;
468
469 /* Symref? */
470 if (strncmp(buffer, "ref:", 4))
471 return -1;
472 p = buffer + 4;
473 while (isspace(*p))
474 p++;
475
85be1fe3 476 return resolve_gitlink_ref_recursive(name, pathlen, p, sha1, recursion+1);
0ebde32c
LT
477}
478
85be1fe3 479int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1)
0ebde32c
LT
480{
481 int len = strlen(path), retval;
482 char *gitdir;
842abf06 483 const char *tmp;
0ebde32c
LT
484
485 while (len && path[len-1] == '/')
486 len--;
487 if (!len)
488 return -1;
489 gitdir = xmalloc(len + MAXREFLEN + 8);
490 memcpy(gitdir, path, len);
842abf06
LH
491 memcpy(gitdir + len, "/.git", 6);
492 len += 5;
493
13d6ec91 494 tmp = read_gitfile(gitdir);
842abf06
LH
495 if (tmp) {
496 free(gitdir);
497 len = strlen(tmp);
498 gitdir = xmalloc(len + MAXREFLEN + 3);
499 memcpy(gitdir, tmp, len);
500 }
501 gitdir[len] = '/';
502 gitdir[++len] = '\0';
85be1fe3 503 retval = resolve_gitlink_ref_recursive(gitdir, len, refname, sha1, 0);
0ebde32c
LT
504 free(gitdir);
505 return retval;
506}
ca8db142 507
4886b89f 508/*
c224ca7f
MH
509 * Try to read ref from the packed references. On success, set sha1
510 * and return 0; otherwise, return -1.
4886b89f 511 */
dfefa935 512static int get_packed_ref(const char *refname, unsigned char *sha1)
c224ca7f 513{
2c5c66be 514 struct ref_array *packed = get_packed_refs(NULL);
dfefa935 515 struct ref_entry *entry = search_ref_array(packed, refname);
2c5c66be
JH
516 if (entry) {
517 hashcpy(sha1, entry->sha1);
518 return 0;
c224ca7f
MH
519 }
520 return -1;
521}
522
dfefa935 523const char *resolve_ref(const char *refname, unsigned char *sha1, int reading, int *flag)
8a65ff76 524{
0104ca09
HO
525 int depth = MAXDEPTH;
526 ssize_t len;
a876ed83 527 char buffer[256];
dfefa935 528 static char refname_buffer[256];
ca8db142 529
8da19775
JH
530 if (flag)
531 *flag = 0;
532
dfefa935 533 if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
8384d788
MH
534 return NULL;
535
a876ed83 536 for (;;) {
55956350 537 char path[PATH_MAX];
a876ed83
JH
538 struct stat st;
539 char *buf;
540 int fd;
8a65ff76 541
a876ed83
JH
542 if (--depth < 0)
543 return NULL;
ca8db142 544
dfefa935 545 git_snpath(path, sizeof(path), "%s", refname);
c224ca7f 546
a876ed83 547 if (lstat(path, &st) < 0) {
c224ca7f
MH
548 if (errno != ENOENT)
549 return NULL;
550 /*
551 * The loose reference file does not exist;
552 * check for a packed reference.
553 */
dfefa935 554 if (!get_packed_ref(refname, sha1)) {
c224ca7f
MH
555 if (flag)
556 *flag |= REF_ISPACKED;
dfefa935 557 return refname;
434cd0cd 558 }
c224ca7f
MH
559 /* The reference is not a packed reference, either. */
560 if (reading) {
a876ed83 561 return NULL;
c224ca7f
MH
562 } else {
563 hashclr(sha1);
dfefa935 564 return refname;
c224ca7f 565 }
a876ed83 566 }
ca8db142 567
a876ed83
JH
568 /* Follow "normalized" - ie "refs/.." symlinks by hand */
569 if (S_ISLNK(st.st_mode)) {
570 len = readlink(path, buffer, sizeof(buffer)-1);
7bb2bf8e
MH
571 if (len < 0)
572 return NULL;
b54cb795 573 buffer[len] = 0;
1f58a038
MH
574 if (!prefixcmp(buffer, "refs/") &&
575 !check_refname_format(buffer, 0)) {
dfefa935
MH
576 strcpy(refname_buffer, buffer);
577 refname = refname_buffer;
8da19775
JH
578 if (flag)
579 *flag |= REF_ISSYMREF;
a876ed83
JH
580 continue;
581 }
ca8db142 582 }
a876ed83 583
7a21632f
DS
584 /* Is it a directory? */
585 if (S_ISDIR(st.st_mode)) {
586 errno = EISDIR;
587 return NULL;
588 }
589
a876ed83
JH
590 /*
591 * Anything else, just open it and try to use it as
592 * a ref
593 */
594 fd = open(path, O_RDONLY);
595 if (fd < 0)
596 return NULL;
93d26e4c 597 len = read_in_full(fd, buffer, sizeof(buffer)-1);
a876ed83 598 close(fd);
28775050
MH
599 if (len < 0)
600 return NULL;
601 while (len && isspace(buffer[len-1]))
602 len--;
603 buffer[len] = '\0';
a876ed83
JH
604
605 /*
606 * Is it a symbolic ref?
607 */
28775050 608 if (prefixcmp(buffer, "ref:"))
a876ed83 609 break;
55956350
JH
610 if (flag)
611 *flag |= REF_ISSYMREF;
a876ed83 612 buf = buffer + 4;
28775050
MH
613 while (isspace(*buf))
614 buf++;
313fb010 615 if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) {
55956350
JH
616 if (flag)
617 *flag |= REF_ISBROKEN;
313fb010
MH
618 return NULL;
619 }
dfefa935 620 refname = strcpy(refname_buffer, buf);
8a65ff76 621 }
f989fea0
MH
622 /* Please note that FETCH_HEAD has a second line containing other data. */
623 if (get_sha1_hex(buffer, sha1) || (buffer[40] != '\0' && !isspace(buffer[40]))) {
55956350
JH
624 if (flag)
625 *flag |= REF_ISBROKEN;
a876ed83 626 return NULL;
629cd3ac 627 }
dfefa935 628 return refname;
a876ed83
JH
629}
630
d08bae7e
IL
631/* The argument to filter_refs */
632struct ref_filter {
633 const char *pattern;
634 each_ref_fn *fn;
635 void *cb_data;
636};
637
dfefa935 638int read_ref_full(const char *refname, unsigned char *sha1, int reading, int *flags)
a876ed83 639{
dfefa935 640 if (resolve_ref(refname, sha1, reading, flags))
a876ed83
JH
641 return 0;
642 return -1;
8a65ff76
LT
643}
644
dfefa935 645int read_ref(const char *refname, unsigned char *sha1)
c6893323 646{
dfefa935 647 return read_ref_full(refname, sha1, 1, NULL);
c6893323
NTND
648}
649
f8948e2f 650#define DO_FOR_EACH_INCLUDE_BROKEN 01
ef06b918 651static int do_one_ref(const char *base, each_ref_fn fn, int trim,
e9c4c111 652 int flags, void *cb_data, struct ref_entry *entry)
ef06b918 653{
b3cfc406 654 if (prefixcmp(entry->name, base))
ef06b918 655 return 0;
e01de1c9 656
f8948e2f 657 if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) {
98ac34b2
JH
658 if (entry->flag & REF_ISBROKEN)
659 return 0; /* ignore broken refs e.g. dangling symref */
f8948e2f
JH
660 if (!has_sha1_file(entry->sha1)) {
661 error("%s does not point to a valid object!", entry->name);
662 return 0;
663 }
ef06b918 664 }
0ae91be0 665 current_ref = entry;
ef06b918
JH
666 return fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
667}
668
85be1fe3 669static int filter_refs(const char *refname, const unsigned char *sha1, int flags,
dfefa935 670 void *data)
d08bae7e
IL
671{
672 struct ref_filter *filter = (struct ref_filter *)data;
dfefa935 673 if (fnmatch(filter->pattern, refname, 0))
d08bae7e 674 return 0;
85be1fe3 675 return filter->fn(refname, sha1, flags, filter->cb_data);
d08bae7e
IL
676}
677
dfefa935 678int peel_ref(const char *refname, unsigned char *sha1)
cf0adba7
JH
679{
680 int flag;
681 unsigned char base[20];
682 struct object *o;
683
dfefa935
MH
684 if (current_ref && (current_ref->name == refname
685 || !strcmp(current_ref->name, refname))) {
0ae91be0
SP
686 if (current_ref->flag & REF_KNOWS_PEELED) {
687 hashcpy(sha1, current_ref->peeled);
688 return 0;
689 }
690 hashcpy(base, current_ref->sha1);
691 goto fallback;
692 }
693
dfefa935 694 if (read_ref_full(refname, base, 1, &flag))
cf0adba7
JH
695 return -1;
696
697 if ((flag & REF_ISPACKED)) {
e9c4c111 698 struct ref_array *array = get_packed_refs(NULL);
dfefa935 699 struct ref_entry *r = search_ref_array(array, refname);
cf0adba7 700
e9c4c111
JP
701 if (r != NULL && r->flag & REF_KNOWS_PEELED) {
702 hashcpy(sha1, r->peeled);
703 return 0;
cf0adba7 704 }
cf0adba7
JH
705 }
706
0ae91be0 707fallback:
cf0adba7 708 o = parse_object(base);
8c87dc77 709 if (o && o->type == OBJ_TAG) {
dfefa935 710 o = deref_tag(o, refname, 0);
cf0adba7
JH
711 if (o) {
712 hashcpy(sha1, o->sha1);
713 return 0;
714 }
715 }
716 return -1;
717}
718
0bad611b
HV
719static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn,
720 int trim, int flags, void *cb_data)
8a65ff76 721{
e9c4c111
JP
722 int retval = 0, i, p = 0, l = 0;
723 struct ref_array *packed = get_packed_refs(submodule);
724 struct ref_array *loose = get_loose_refs(submodule);
8a65ff76 725
e9c4c111 726 struct ref_array *extra = &extra_refs;
e142a3c6 727
e9c4c111
JP
728 for (i = 0; i < extra->nr; i++)
729 retval = do_one_ref(base, fn, trim, flags, cb_data, extra->refs[i]);
e142a3c6 730
e9c4c111
JP
731 while (p < packed->nr && l < loose->nr) {
732 struct ref_entry *entry;
733 int cmp = strcmp(packed->refs[p]->name, loose->refs[l]->name);
e1e22e37 734 if (!cmp) {
e9c4c111 735 p++;
e1e22e37 736 continue;
6cada6a9 737 }
e1e22e37 738 if (cmp > 0) {
e9c4c111 739 entry = loose->refs[l++];
e1e22e37 740 } else {
e9c4c111 741 entry = packed->refs[p++];
e1e22e37 742 }
f8948e2f 743 retval = do_one_ref(base, fn, trim, flags, cb_data, entry);
e1e22e37 744 if (retval)
0ae91be0 745 goto end_each;
e1e22e37 746 }
8a65ff76 747
e9c4c111
JP
748 if (l < loose->nr) {
749 p = l;
750 packed = loose;
751 }
752
753 for (; p < packed->nr; p++) {
754 retval = do_one_ref(base, fn, trim, flags, cb_data, packed->refs[p]);
ef06b918 755 if (retval)
0ae91be0 756 goto end_each;
8a65ff76 757 }
0ae91be0
SP
758
759end_each:
760 current_ref = NULL;
761 return retval;
8a65ff76
LT
762}
763
0bad611b
HV
764
765static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data)
723c31fe
LT
766{
767 unsigned char sha1[20];
8da19775
JH
768 int flag;
769
0bad611b
HV
770 if (submodule) {
771 if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0)
772 return fn("HEAD", sha1, 0, cb_data);
773
774 return 0;
775 }
776
c6893323 777 if (!read_ref_full("HEAD", sha1, 1, &flag))
8da19775 778 return fn("HEAD", sha1, flag, cb_data);
0bad611b 779
2f34ba32 780 return 0;
723c31fe
LT
781}
782
0bad611b
HV
783int head_ref(each_ref_fn fn, void *cb_data)
784{
785 return do_head_ref(NULL, fn, cb_data);
786}
787
9ef6aeb0
HV
788int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
789{
790 return do_head_ref(submodule, fn, cb_data);
791}
792
cb5d709f 793int for_each_ref(each_ref_fn fn, void *cb_data)
8a65ff76 794{
b3cfc406 795 return do_for_each_ref(NULL, "", fn, 0, 0, cb_data);
a62be77f
SE
796}
797
9ef6aeb0
HV
798int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
799{
b3cfc406 800 return do_for_each_ref(submodule, "", fn, 0, 0, cb_data);
a62be77f
SE
801}
802
2a8177b6
CC
803int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
804{
0bad611b 805 return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data);
2a8177b6
CC
806}
807
9ef6aeb0
HV
808int for_each_ref_in_submodule(const char *submodule, const char *prefix,
809 each_ref_fn fn, void *cb_data)
810{
811 return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data);
2a8177b6
CC
812}
813
cb5d709f 814int for_each_tag_ref(each_ref_fn fn, void *cb_data)
a62be77f 815{
2a8177b6 816 return for_each_ref_in("refs/tags/", fn, cb_data);
a62be77f
SE
817}
818
9ef6aeb0
HV
819int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
820{
821 return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data);
822}
823
cb5d709f 824int for_each_branch_ref(each_ref_fn fn, void *cb_data)
a62be77f 825{
2a8177b6 826 return for_each_ref_in("refs/heads/", fn, cb_data);
a62be77f
SE
827}
828
9ef6aeb0
HV
829int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
830{
831 return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data);
832}
833
cb5d709f 834int for_each_remote_ref(each_ref_fn fn, void *cb_data)
a62be77f 835{
2a8177b6 836 return for_each_ref_in("refs/remotes/", fn, cb_data);
f8948e2f
JH
837}
838
9ef6aeb0
HV
839int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
840{
841 return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data);
842}
843
29268700
CC
844int for_each_replace_ref(each_ref_fn fn, void *cb_data)
845{
0bad611b 846 return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data);
29268700
CC
847}
848
a1bea2c1
JT
849int head_ref_namespaced(each_ref_fn fn, void *cb_data)
850{
851 struct strbuf buf = STRBUF_INIT;
852 int ret = 0;
853 unsigned char sha1[20];
854 int flag;
855
856 strbuf_addf(&buf, "%sHEAD", get_git_namespace());
c6893323 857 if (!read_ref_full(buf.buf, sha1, 1, &flag))
a1bea2c1
JT
858 ret = fn(buf.buf, sha1, flag, cb_data);
859 strbuf_release(&buf);
860
861 return ret;
862}
863
864int for_each_namespaced_ref(each_ref_fn fn, void *cb_data)
865{
866 struct strbuf buf = STRBUF_INIT;
867 int ret;
868 strbuf_addf(&buf, "%srefs/", get_git_namespace());
869 ret = do_for_each_ref(NULL, buf.buf, fn, 0, 0, cb_data);
870 strbuf_release(&buf);
871 return ret;
872}
873
b09fe971
IL
874int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
875 const char *prefix, void *cb_data)
d08bae7e
IL
876{
877 struct strbuf real_pattern = STRBUF_INIT;
878 struct ref_filter filter;
d08bae7e
IL
879 int ret;
880
b09fe971 881 if (!prefix && prefixcmp(pattern, "refs/"))
d08bae7e 882 strbuf_addstr(&real_pattern, "refs/");
b09fe971
IL
883 else if (prefix)
884 strbuf_addstr(&real_pattern, prefix);
d08bae7e
IL
885 strbuf_addstr(&real_pattern, pattern);
886
894a9d33 887 if (!has_glob_specials(pattern)) {
9517e6b8 888 /* Append implied '/' '*' if not present. */
d08bae7e
IL
889 if (real_pattern.buf[real_pattern.len - 1] != '/')
890 strbuf_addch(&real_pattern, '/');
891 /* No need to check for '*', there is none. */
892 strbuf_addch(&real_pattern, '*');
893 }
894
895 filter.pattern = real_pattern.buf;
896 filter.fn = fn;
897 filter.cb_data = cb_data;
898 ret = for_each_ref(filter_refs, &filter);
899
900 strbuf_release(&real_pattern);
901 return ret;
902}
903
b09fe971
IL
904int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data)
905{
906 return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
907}
908
f8948e2f
JH
909int for_each_rawref(each_ref_fn fn, void *cb_data)
910{
b3cfc406 911 return do_for_each_ref(NULL, "", fn, 0,
f8948e2f 912 DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
8a65ff76
LT
913}
914
03feddd6
JH
915/*
916 * Make sure "ref" is something reasonable to have under ".git/refs/";
917 * We do not like it if:
918 *
919 * - any path component of it begins with ".", or
920 * - it has double dots "..", or
921 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
922 * - it ends with a "/".
3e262b95 923 * - it ends with ".lock"
a4c2e699 924 * - it contains a "\" (backslash)
03feddd6
JH
925 */
926
9224b73b 927/* Return true iff ch is not allowed in reference names. */
03feddd6
JH
928static inline int bad_ref_char(int ch)
929{
f3738c1c 930 if (((unsigned) ch) <= ' ' || ch == 0x7f ||
a4c2e699 931 ch == '~' || ch == '^' || ch == ':' || ch == '\\')
8558fd9e
DB
932 return 1;
933 /* 2.13 Pattern Matching Notation */
9224b73b 934 if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */
8558fd9e 935 return 1;
8558fd9e 936 return 0;
03feddd6
JH
937}
938
49295d4e 939/*
dfefa935 940 * Try to read one refname component from the front of refname. Return
49295d4e
MH
941 * the length of the component found, or -1 if the component is not
942 * legal.
943 */
dfefa935 944static int check_refname_component(const char *refname, int flags)
95fc7512 945{
49295d4e
MH
946 const char *cp;
947 char last = '\0';
03feddd6 948
dfefa935 949 for (cp = refname; ; cp++) {
49295d4e
MH
950 char ch = *cp;
951 if (ch == '\0' || ch == '/')
952 break;
953 if (bad_ref_char(ch))
954 return -1; /* Illegal character in refname. */
955 if (last == '.' && ch == '.')
956 return -1; /* Refname contains "..". */
957 if (last == '@' && ch == '{')
958 return -1; /* Refname contains "@{". */
cbdffe40 959 last = ch;
49295d4e 960 }
dfefa935 961 if (cp == refname)
49295d4e 962 return -1; /* Component has zero length. */
dfefa935 963 if (refname[0] == '.') {
dce4bab6
MH
964 if (!(flags & REFNAME_DOT_COMPONENT))
965 return -1; /* Component starts with '.'. */
966 /*
967 * Even if leading dots are allowed, don't allow "."
968 * as a component (".." is prevented by a rule above).
969 */
dfefa935 970 if (refname[1] == '\0')
dce4bab6
MH
971 return -1; /* Component equals ".". */
972 }
dfefa935 973 if (cp - refname >= 5 && !memcmp(cp - 5, ".lock", 5))
7e9d2fe9 974 return -1; /* Refname ends with ".lock". */
dfefa935 975 return cp - refname;
49295d4e
MH
976}
977
dfefa935 978int check_refname_format(const char *refname, int flags)
95fc7512 979{
49295d4e 980 int component_len, component_count = 0;
03feddd6 981
03feddd6 982 while (1) {
49295d4e 983 /* We are at the start of a path component. */
dfefa935 984 component_len = check_refname_component(refname, flags);
49295d4e
MH
985 if (component_len < 0) {
986 if ((flags & REFNAME_REFSPEC_PATTERN) &&
dfefa935
MH
987 refname[0] == '*' &&
988 (refname[1] == '\0' || refname[1] == '/')) {
8d9c5010
MH
989 /* Accept one wildcard as a full refname component. */
990 flags &= ~REFNAME_REFSPEC_PATTERN;
49295d4e
MH
991 component_len = 1;
992 } else {
8d9c5010 993 return -1;
49295d4e 994 }
03feddd6 995 }
49295d4e 996 component_count++;
dfefa935 997 if (refname[component_len] == '\0')
49295d4e
MH
998 break;
999 /* Skip to next component. */
dfefa935 1000 refname += component_len + 1;
03feddd6 1001 }
49295d4e 1002
dfefa935 1003 if (refname[component_len - 1] == '.')
49295d4e 1004 return -1; /* Refname ends with '.'. */
49295d4e
MH
1005 if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2)
1006 return -1; /* Refname has only one component. */
1007 return 0;
95fc7512
DB
1008}
1009
4577e483 1010const char *prettify_refname(const char *name)
a9c37a72 1011{
a9c37a72
DB
1012 return name + (
1013 !prefixcmp(name, "refs/heads/") ? 11 :
1014 !prefixcmp(name, "refs/tags/") ? 10 :
1015 !prefixcmp(name, "refs/remotes/") ? 13 :
1016 0);
1017}
1018
79803322
SP
1019const char *ref_rev_parse_rules[] = {
1020 "%.*s",
1021 "refs/%.*s",
1022 "refs/tags/%.*s",
1023 "refs/heads/%.*s",
1024 "refs/remotes/%.*s",
1025 "refs/remotes/%.*s/HEAD",
1026 NULL
1027};
1028
1029int refname_match(const char *abbrev_name, const char *full_name, const char **rules)
1030{
1031 const char **p;
1032 const int abbrev_name_len = strlen(abbrev_name);
1033
1034 for (p = rules; *p; p++) {
1035 if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
1036 return 1;
1037 }
1038 }
1039
1040 return 0;
1041}
1042
e5f38ec3 1043static struct ref_lock *verify_lock(struct ref_lock *lock,
4bd18c43
SP
1044 const unsigned char *old_sha1, int mustexist)
1045{
c6893323 1046 if (read_ref_full(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
434cd0cd 1047 error("Can't verify ref %s", lock->ref_name);
4bd18c43
SP
1048 unlock_ref(lock);
1049 return NULL;
1050 }
a89fccd2 1051 if (hashcmp(lock->old_sha1, old_sha1)) {
434cd0cd 1052 error("Ref %s is at %s but expected %s", lock->ref_name,
4bd18c43
SP
1053 sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
1054 unlock_ref(lock);
1055 return NULL;
1056 }
1057 return lock;
1058}
1059
7155b727 1060static int remove_empty_directories(const char *file)
bc7127ef
JH
1061{
1062 /* we want to create a file but there is a directory there;
1063 * if that is an empty directory (or a directory that contains
1064 * only empty directories), remove them.
1065 */
7155b727
JS
1066 struct strbuf path;
1067 int result;
bc7127ef 1068
7155b727
JS
1069 strbuf_init(&path, 20);
1070 strbuf_addstr(&path, file);
1071
a0f4afbe 1072 result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY);
7155b727
JS
1073
1074 strbuf_release(&path);
1075
1076 return result;
bc7127ef
JH
1077}
1078
19b68b1e
MH
1079/*
1080 * Return true iff a reference named refname could be created without
1081 * conflicting with the name of an existing reference. If oldrefname
1082 * is non-NULL, ignore potential conflicts with oldrefname (e.g.,
1083 * because oldrefname is scheduled for deletion in the same
1084 * operation).
1085 */
dfefa935 1086static int is_refname_available(const char *refname, const char *oldrefname,
19b68b1e 1087 struct ref_array *array)
c976d415 1088{
dfefa935 1089 int i, namlen = strlen(refname); /* e.g. 'foo/bar' */
e9c4c111
JP
1090 for (i = 0; i < array->nr; i++ ) {
1091 struct ref_entry *entry = array->refs[i];
1092 /* entry->name could be 'foo' or 'foo/bar/baz' */
dfefa935 1093 if (!oldrefname || strcmp(oldrefname, entry->name)) {
e9c4c111 1094 int len = strlen(entry->name);
c976d415 1095 int cmplen = (namlen < len) ? namlen : len;
dfefa935
MH
1096 const char *lead = (namlen < len) ? entry->name : refname;
1097 if (!strncmp(refname, entry->name, cmplen) &&
c976d415 1098 lead[cmplen] == '/') {
19b68b1e
MH
1099 error("'%s' exists; cannot create '%s'",
1100 entry->name, refname);
c976d415
LH
1101 return 0;
1102 }
1103 }
c976d415
LH
1104 }
1105 return 1;
1106}
1107
ff74f7f1
JH
1108/*
1109 * *string and *len will only be substituted, and *string returned (for
1110 * later free()ing) if the string passed in is a magic short-hand form
1111 * to name a branch.
1112 */
1113static char *substitute_branch_name(const char **string, int *len)
1114{
1115 struct strbuf buf = STRBUF_INIT;
1116 int ret = interpret_branch_name(*string, &buf);
1117
1118 if (ret == *len) {
1119 size_t size;
1120 *string = strbuf_detach(&buf, &size);
1121 *len = size;
1122 return (char *)*string;
1123 }
1124
1125 return NULL;
1126}
1127
1128int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
1129{
1130 char *last_branch = substitute_branch_name(&str, &len);
1131 const char **p, *r;
1132 int refs_found = 0;
1133
1134 *ref = NULL;
1135 for (p = ref_rev_parse_rules; *p; p++) {
1136 char fullref[PATH_MAX];
1137 unsigned char sha1_from_ref[20];
1138 unsigned char *this_result;
1139 int flag;
1140
1141 this_result = refs_found ? sha1_from_ref : sha1;
1142 mksnpath(fullref, sizeof(fullref), *p, len, str);
1143 r = resolve_ref(fullref, this_result, 1, &flag);
1144 if (r) {
1145 if (!refs_found++)
1146 *ref = xstrdup(r);
1147 if (!warn_ambiguous_refs)
1148 break;
55956350 1149 } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) {
ff74f7f1 1150 warning("ignoring dangling symref %s.", fullref);
55956350
JH
1151 } else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) {
1152 warning("ignoring broken ref %s.", fullref);
1153 }
ff74f7f1
JH
1154 }
1155 free(last_branch);
1156 return refs_found;
1157}
1158
1159int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
1160{
1161 char *last_branch = substitute_branch_name(&str, &len);
1162 const char **p;
1163 int logs_found = 0;
1164
1165 *log = NULL;
1166 for (p = ref_rev_parse_rules; *p; p++) {
1167 struct stat st;
1168 unsigned char hash[20];
1169 char path[PATH_MAX];
1170 const char *ref, *it;
1171
1172 mksnpath(path, sizeof(path), *p, len, str);
1173 ref = resolve_ref(path, hash, 1, NULL);
1174 if (!ref)
1175 continue;
1176 if (!stat(git_path("logs/%s", path), &st) &&
1177 S_ISREG(st.st_mode))
1178 it = path;
1179 else if (strcmp(ref, path) &&
1180 !stat(git_path("logs/%s", ref), &st) &&
1181 S_ISREG(st.st_mode))
1182 it = ref;
1183 else
1184 continue;
1185 if (!logs_found++) {
1186 *log = xstrdup(it);
1187 hashcpy(sha1, hash);
1188 }
1189 if (!warn_ambiguous_refs)
1190 break;
1191 }
1192 free(last_branch);
1193 return logs_found;
1194}
1195
dfefa935
MH
1196static struct ref_lock *lock_ref_sha1_basic(const char *refname,
1197 const unsigned char *old_sha1,
1198 int flags, int *type_p)
4bd18c43 1199{
434cd0cd 1200 char *ref_file;
dfefa935 1201 const char *orig_refname = refname;
4bd18c43 1202 struct ref_lock *lock;
5cc3cef9 1203 int last_errno = 0;
acd3b9ec 1204 int type, lflags;
4431fcc4 1205 int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
5bdd8d4a 1206 int missing = 0;
4bd18c43
SP
1207
1208 lock = xcalloc(1, sizeof(struct ref_lock));
1209 lock->lock_fd = -1;
1210
dfefa935
MH
1211 refname = resolve_ref(refname, lock->old_sha1, mustexist, &type);
1212 if (!refname && errno == EISDIR) {
bc7127ef
JH
1213 /* we are trying to lock foo but we used to
1214 * have foo/bar which now does not exist;
1215 * it is normal for the empty directory 'foo'
1216 * to remain.
1217 */
dfefa935 1218 ref_file = git_path("%s", orig_refname);
5cc3cef9
JH
1219 if (remove_empty_directories(ref_file)) {
1220 last_errno = errno;
dfefa935 1221 error("there are still refs under '%s'", orig_refname);
5cc3cef9
JH
1222 goto error_return;
1223 }
dfefa935 1224 refname = resolve_ref(orig_refname, lock->old_sha1, mustexist, &type);
bc7127ef 1225 }
68db31cc
SV
1226 if (type_p)
1227 *type_p = type;
dfefa935 1228 if (!refname) {
5cc3cef9 1229 last_errno = errno;
818f477c 1230 error("unable to resolve reference %s: %s",
dfefa935 1231 orig_refname, strerror(errno));
5cc3cef9 1232 goto error_return;
4bd18c43 1233 }
5bdd8d4a 1234 missing = is_null_sha1(lock->old_sha1);
c976d415
LH
1235 /* When the ref did not exist and we are creating it,
1236 * make sure there is no existing ref that is packed
1237 * whose name begins with our refname, nor a ref whose
1238 * name is a proper prefix of our refname.
1239 */
5bdd8d4a 1240 if (missing &&
19b68b1e 1241 !is_refname_available(refname, NULL, get_packed_refs(NULL))) {
f475e08e 1242 last_errno = ENOTDIR;
c976d415 1243 goto error_return;
f475e08e 1244 }
22a3844e 1245
c33d5174 1246 lock->lk = xcalloc(1, sizeof(struct lock_file));
4bd18c43 1247
acd3b9ec
JH
1248 lflags = LOCK_DIE_ON_ERROR;
1249 if (flags & REF_NODEREF) {
dfefa935 1250 refname = orig_refname;
acd3b9ec
JH
1251 lflags |= LOCK_NODEREF;
1252 }
dfefa935
MH
1253 lock->ref_name = xstrdup(refname);
1254 lock->orig_ref_name = xstrdup(orig_refname);
1255 ref_file = git_path("%s", refname);
5bdd8d4a 1256 if (missing)
68db31cc
SV
1257 lock->force_write = 1;
1258 if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
1259 lock->force_write = 1;
4bd18c43 1260
5cc3cef9
JH
1261 if (safe_create_leading_directories(ref_file)) {
1262 last_errno = errno;
1263 error("unable to create directory for %s", ref_file);
1264 goto error_return;
1265 }
4bd18c43 1266
acd3b9ec 1267 lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags);
4bd18c43 1268 return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
5cc3cef9
JH
1269
1270 error_return:
1271 unlock_ref(lock);
1272 errno = last_errno;
1273 return NULL;
4bd18c43
SP
1274}
1275
dfefa935 1276struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha1)
95fc7512 1277{
53cce84c 1278 char refpath[PATH_MAX];
dfefa935 1279 if (check_refname_format(refname, 0))
4bd18c43 1280 return NULL;
dfefa935 1281 strcpy(refpath, mkpath("refs/%s", refname));
68db31cc 1282 return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
4bd18c43
SP
1283}
1284
dfefa935
MH
1285struct ref_lock *lock_any_ref_for_update(const char *refname,
1286 const unsigned char *old_sha1, int flags)
4bd18c43 1287{
dfefa935 1288 if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
257f3020 1289 return NULL;
dfefa935 1290 return lock_ref_sha1_basic(refname, old_sha1, flags, NULL);
c0277d15
JH
1291}
1292
26a063a1
JH
1293static struct lock_file packlock;
1294
c0277d15
JH
1295static int repack_without_ref(const char *refname)
1296{
e9c4c111
JP
1297 struct ref_array *packed;
1298 struct ref_entry *ref;
1299 int fd, i;
c0277d15 1300
e9c4c111
JP
1301 packed = get_packed_refs(NULL);
1302 ref = search_ref_array(packed, refname);
1303 if (ref == NULL)
c0277d15 1304 return 0;
c0277d15 1305 fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
1b018fd9
MV
1306 if (fd < 0) {
1307 unable_to_lock_error(git_path("packed-refs"), errno);
c0277d15 1308 return error("cannot delete '%s' from packed refs", refname);
1b018fd9 1309 }
c0277d15 1310
e9c4c111 1311 for (i = 0; i < packed->nr; i++) {
c0277d15
JH
1312 char line[PATH_MAX + 100];
1313 int len;
1314
e9c4c111
JP
1315 ref = packed->refs[i];
1316
1317 if (!strcmp(refname, ref->name))
c0277d15
JH
1318 continue;
1319 len = snprintf(line, sizeof(line), "%s %s\n",
e9c4c111 1320 sha1_to_hex(ref->sha1), ref->name);
c0277d15
JH
1321 /* this should not happen but just being defensive */
1322 if (len > sizeof(line))
e9c4c111 1323 die("too long a refname '%s'", ref->name);
c0277d15
JH
1324 write_or_die(fd, line, len);
1325 }
1326 return commit_lock_file(&packlock);
1327}
1328
eca35a25 1329int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
c0277d15
JH
1330{
1331 struct ref_lock *lock;
eca35a25 1332 int err, i = 0, ret = 0, flag = 0;
c0277d15 1333
68db31cc 1334 lock = lock_ref_sha1_basic(refname, sha1, 0, &flag);
c0277d15
JH
1335 if (!lock)
1336 return 1;
045a476f 1337 if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
c0277d15 1338 /* loose */
eca35a25
MV
1339 const char *path;
1340
1341 if (!(delopt & REF_NODEREF)) {
1342 i = strlen(lock->lk->filename) - 5; /* .lock */
1343 lock->lk->filename[i] = 0;
1344 path = lock->lk->filename;
1345 } else {
9db56f71 1346 path = git_path("%s", refname);
eca35a25 1347 }
691f1a28
AR
1348 err = unlink_or_warn(path);
1349 if (err && errno != ENOENT)
c0277d15 1350 ret = 1;
691f1a28 1351
eca35a25
MV
1352 if (!(delopt & REF_NODEREF))
1353 lock->lk->filename[i] = '.';
c0277d15
JH
1354 }
1355 /* removing the loose one could have resurrected an earlier
1356 * packed one. Also, if it was not loose we need to repack
1357 * without it.
1358 */
1359 ret |= repack_without_ref(refname);
1360
691f1a28 1361 unlink_or_warn(git_path("logs/%s", lock->ref_name));
3870a0d1 1362 invalidate_ref_cache(NULL);
c0277d15
JH
1363 unlock_ref(lock);
1364 return ret;
4bd18c43
SP
1365}
1366
765c2258
PH
1367/*
1368 * People using contrib's git-new-workdir have .git/logs/refs ->
1369 * /some/other/path/.git/logs/refs, and that may live on another device.
1370 *
1371 * IOW, to avoid cross device rename errors, the temporary renamed log must
1372 * live into logs/refs.
1373 */
1374#define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1375
dfefa935 1376int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg)
c976d415 1377{
c976d415
LH
1378 unsigned char sha1[20], orig_sha1[20];
1379 int flag = 0, logmoved = 0;
1380 struct ref_lock *lock;
c976d415 1381 struct stat loginfo;
dfefa935 1382 int log = !lstat(git_path("logs/%s", oldrefname), &loginfo);
eca35a25 1383 const char *symref = NULL;
c976d415 1384
450d4c0f 1385 if (log && S_ISLNK(loginfo.st_mode))
dfefa935 1386 return error("reflog for %s is a symlink", oldrefname);
c976d415 1387
dfefa935 1388 symref = resolve_ref(oldrefname, orig_sha1, 1, &flag);
eca35a25 1389 if (flag & REF_ISSYMREF)
fa58186c 1390 return error("refname %s is a symbolic ref, renaming it is not supported",
dfefa935 1391 oldrefname);
eca35a25 1392 if (!symref)
dfefa935 1393 return error("refname %s not found", oldrefname);
c976d415 1394
19b68b1e 1395 if (!is_refname_available(newrefname, oldrefname, get_packed_refs(NULL)))
c976d415
LH
1396 return 1;
1397
19b68b1e 1398 if (!is_refname_available(newrefname, oldrefname, get_loose_refs(NULL)))
c976d415
LH
1399 return 1;
1400
dfefa935 1401 if (log && rename(git_path("logs/%s", oldrefname), git_path(TMP_RENAMED_LOG)))
765c2258 1402 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
dfefa935 1403 oldrefname, strerror(errno));
c976d415 1404
dfefa935
MH
1405 if (delete_ref(oldrefname, orig_sha1, REF_NODEREF)) {
1406 error("unable to delete old %s", oldrefname);
c976d415
LH
1407 goto rollback;
1408 }
1409
dfefa935
MH
1410 if (!read_ref_full(newrefname, sha1, 1, &flag) &&
1411 delete_ref(newrefname, sha1, REF_NODEREF)) {
c976d415 1412 if (errno==EISDIR) {
dfefa935
MH
1413 if (remove_empty_directories(git_path("%s", newrefname))) {
1414 error("Directory not empty: %s", newrefname);
c976d415
LH
1415 goto rollback;
1416 }
1417 } else {
dfefa935 1418 error("unable to delete existing %s", newrefname);
c976d415
LH
1419 goto rollback;
1420 }
1421 }
1422
dfefa935
MH
1423 if (log && safe_create_leading_directories(git_path("logs/%s", newrefname))) {
1424 error("unable to create directory for %s", newrefname);
c976d415
LH
1425 goto rollback;
1426 }
1427
1428 retry:
dfefa935 1429 if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname))) {
d9e74d57
JR
1430 if (errno==EISDIR || errno==ENOTDIR) {
1431 /*
1432 * rename(a, b) when b is an existing
1433 * directory ought to result in ISDIR, but
1434 * Solaris 5.8 gives ENOTDIR. Sheesh.
1435 */
dfefa935
MH
1436 if (remove_empty_directories(git_path("logs/%s", newrefname))) {
1437 error("Directory not empty: logs/%s", newrefname);
c976d415
LH
1438 goto rollback;
1439 }
1440 goto retry;
1441 } else {
765c2258 1442 error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
dfefa935 1443 newrefname, strerror(errno));
c976d415
LH
1444 goto rollback;
1445 }
1446 }
1447 logmoved = log;
1448
dfefa935 1449 lock = lock_ref_sha1_basic(newrefname, NULL, 0, NULL);
c976d415 1450 if (!lock) {
dfefa935 1451 error("unable to lock %s for update", newrefname);
c976d415
LH
1452 goto rollback;
1453 }
c976d415
LH
1454 lock->force_write = 1;
1455 hashcpy(lock->old_sha1, orig_sha1);
678d0f4c 1456 if (write_ref_sha1(lock, orig_sha1, logmsg)) {
dfefa935 1457 error("unable to write current sha1 into %s", newrefname);
c976d415
LH
1458 goto rollback;
1459 }
1460
1461 return 0;
1462
1463 rollback:
dfefa935 1464 lock = lock_ref_sha1_basic(oldrefname, NULL, 0, NULL);
c976d415 1465 if (!lock) {
dfefa935 1466 error("unable to lock %s for rollback", oldrefname);
c976d415
LH
1467 goto rollbacklog;
1468 }
1469
1470 lock->force_write = 1;
1471 flag = log_all_ref_updates;
1472 log_all_ref_updates = 0;
1473 if (write_ref_sha1(lock, orig_sha1, NULL))
dfefa935 1474 error("unable to write current sha1 into %s", oldrefname);
c976d415
LH
1475 log_all_ref_updates = flag;
1476
1477 rollbacklog:
dfefa935 1478 if (logmoved && rename(git_path("logs/%s", newrefname), git_path("logs/%s", oldrefname)))
c976d415 1479 error("unable to restore logfile %s from %s: %s",
dfefa935 1480 oldrefname, newrefname, strerror(errno));
c976d415 1481 if (!logmoved && log &&
dfefa935 1482 rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldrefname)))
765c2258 1483 error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s",
dfefa935 1484 oldrefname, strerror(errno));
c976d415
LH
1485
1486 return 1;
1487}
1488
435fc852 1489int close_ref(struct ref_lock *lock)
b531394d
BC
1490{
1491 if (close_lock_file(lock->lk))
1492 return -1;
1493 lock->lock_fd = -1;
1494 return 0;
1495}
1496
435fc852 1497int commit_ref(struct ref_lock *lock)
b531394d
BC
1498{
1499 if (commit_lock_file(lock->lk))
1500 return -1;
1501 lock->lock_fd = -1;
1502 return 0;
1503}
1504
e5f38ec3 1505void unlock_ref(struct ref_lock *lock)
4bd18c43 1506{
4ed7cd3a
BC
1507 /* Do not free lock->lk -- atexit() still looks at them */
1508 if (lock->lk)
1509 rollback_lock_file(lock->lk);
434cd0cd 1510 free(lock->ref_name);
1655707c 1511 free(lock->orig_ref_name);
4bd18c43
SP
1512 free(lock);
1513}
1514
0ec29a47
JH
1515/*
1516 * copy the reflog message msg to buf, which has been allocated sufficiently
1517 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1518 * because reflog file is one line per entry.
1519 */
1520static int copy_msg(char *buf, const char *msg)
1521{
1522 char *cp = buf;
1523 char c;
1524 int wasspace = 1;
1525
1526 *cp++ = '\t';
1527 while ((c = *msg++)) {
1528 if (wasspace && isspace(c))
1529 continue;
1530 wasspace = isspace(c);
1531 if (wasspace)
1532 c = ' ';
1533 *cp++ = c;
1534 }
1535 while (buf < cp && isspace(cp[-1]))
1536 cp--;
1537 *cp++ = '\n';
1538 return cp - buf;
1539}
1540
dfefa935 1541int log_ref_setup(const char *refname, char *logfile, int bufsize)
6de08ae6 1542{
859c3017 1543 int logfd, oflags = O_APPEND | O_WRONLY;
9a13f0b7 1544
dfefa935 1545 git_snpath(logfile, bufsize, "logs/%s", refname);
4057deb5 1546 if (log_all_ref_updates &&
dfefa935
MH
1547 (!prefixcmp(refname, "refs/heads/") ||
1548 !prefixcmp(refname, "refs/remotes/") ||
1549 !prefixcmp(refname, "refs/notes/") ||
1550 !strcmp(refname, "HEAD"))) {
157aaea5 1551 if (safe_create_leading_directories(logfile) < 0)
6de08ae6 1552 return error("unable to create directory for %s",
157aaea5 1553 logfile);
6de08ae6
SP
1554 oflags |= O_CREAT;
1555 }
1556
157aaea5 1557 logfd = open(logfile, oflags, 0666);
6de08ae6 1558 if (logfd < 0) {
1974bf62 1559 if (!(oflags & O_CREAT) && errno == ENOENT)
6de08ae6 1560 return 0;
3b463c3f
JH
1561
1562 if ((oflags & O_CREAT) && errno == EISDIR) {
157aaea5 1563 if (remove_empty_directories(logfile)) {
3b463c3f 1564 return error("There are still logs under '%s'",
157aaea5 1565 logfile);
3b463c3f 1566 }
157aaea5 1567 logfd = open(logfile, oflags, 0666);
3b463c3f
JH
1568 }
1569
1570 if (logfd < 0)
1571 return error("Unable to append to %s: %s",
157aaea5 1572 logfile, strerror(errno));
6de08ae6
SP
1573 }
1574
157aaea5 1575 adjust_shared_perm(logfile);
859c3017
EM
1576 close(logfd);
1577 return 0;
1578}
443b92b6 1579
dfefa935 1580static int log_ref_write(const char *refname, const unsigned char *old_sha1,
859c3017
EM
1581 const unsigned char *new_sha1, const char *msg)
1582{
1583 int logfd, result, written, oflags = O_APPEND | O_WRONLY;
1584 unsigned maxlen, len;
1585 int msglen;
157aaea5 1586 char log_file[PATH_MAX];
859c3017
EM
1587 char *logrec;
1588 const char *committer;
1589
1590 if (log_all_ref_updates < 0)
1591 log_all_ref_updates = !is_bare_repository();
1592
dfefa935 1593 result = log_ref_setup(refname, log_file, sizeof(log_file));
859c3017
EM
1594 if (result)
1595 return result;
1596
1597 logfd = open(log_file, oflags);
1598 if (logfd < 0)
1599 return 0;
0ec29a47 1600 msglen = msg ? strlen(msg) : 0;
774751a8 1601 committer = git_committer_info(0);
8ac65937
JH
1602 maxlen = strlen(committer) + msglen + 100;
1603 logrec = xmalloc(maxlen);
1604 len = sprintf(logrec, "%s %s %s\n",
9a13f0b7
NP
1605 sha1_to_hex(old_sha1),
1606 sha1_to_hex(new_sha1),
8ac65937
JH
1607 committer);
1608 if (msglen)
0ec29a47 1609 len += copy_msg(logrec + len - 1, msg) - 1;
93822c22 1610 written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
6de08ae6 1611 free(logrec);
91c8d590 1612 if (close(logfd) != 0 || written != len)
9a13f0b7 1613 return error("Unable to append to %s", log_file);
6de08ae6
SP
1614 return 0;
1615}
1616
c3b0dec5
LT
1617static int is_branch(const char *refname)
1618{
1619 return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
1620}
1621
4bd18c43
SP
1622int write_ref_sha1(struct ref_lock *lock,
1623 const unsigned char *sha1, const char *logmsg)
1624{
1625 static char term = '\n';
c3b0dec5 1626 struct object *o;
4bd18c43
SP
1627
1628 if (!lock)
95fc7512 1629 return -1;
a89fccd2 1630 if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
4bd18c43
SP
1631 unlock_ref(lock);
1632 return 0;
95fc7512 1633 }
c3b0dec5
LT
1634 o = parse_object(sha1);
1635 if (!o) {
7be8b3ba 1636 error("Trying to write ref %s with nonexistent object %s",
c3b0dec5
LT
1637 lock->ref_name, sha1_to_hex(sha1));
1638 unlock_ref(lock);
1639 return -1;
1640 }
1641 if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
1642 error("Trying to write non-commit object %s to branch %s",
1643 sha1_to_hex(sha1), lock->ref_name);
1644 unlock_ref(lock);
1645 return -1;
1646 }
93822c22
AW
1647 if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
1648 write_in_full(lock->lock_fd, &term, 1) != 1
b531394d 1649 || close_ref(lock) < 0) {
c33d5174 1650 error("Couldn't write %s", lock->lk->filename);
4bd18c43
SP
1651 unlock_ref(lock);
1652 return -1;
1653 }
8bf90dc9 1654 clear_loose_ref_cache(get_ref_cache(NULL));
bd104db1
NP
1655 if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
1656 (strcmp(lock->ref_name, lock->orig_ref_name) &&
1657 log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
6de08ae6
SP
1658 unlock_ref(lock);
1659 return -1;
1660 }
605fac8b
NP
1661 if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
1662 /*
1663 * Special hack: If a branch is updated directly and HEAD
1664 * points to it (may happen on the remote side of a push
1665 * for example) then logically the HEAD reflog should be
1666 * updated too.
1667 * A generic solution implies reverse symref information,
1668 * but finding all symrefs pointing to the given branch
1669 * would be rather costly for this rare event (the direct
1670 * update of a branch) to be worth it. So let's cheat and
1671 * check with HEAD only which should cover 99% of all usage
1672 * scenarios (even 100% of the default ones).
1673 */
1674 unsigned char head_sha1[20];
1675 int head_flag;
1676 const char *head_ref;
1677 head_ref = resolve_ref("HEAD", head_sha1, 1, &head_flag);
1678 if (head_ref && (head_flag & REF_ISSYMREF) &&
1679 !strcmp(head_ref, lock->ref_name))
1680 log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
1681 }
b531394d 1682 if (commit_ref(lock)) {
434cd0cd 1683 error("Couldn't set %s", lock->ref_name);
4bd18c43
SP
1684 unlock_ref(lock);
1685 return -1;
1686 }
4bd18c43
SP
1687 unlock_ref(lock);
1688 return 0;
95fc7512 1689}
d556fae2 1690
8b5157e4
NP
1691int create_symref(const char *ref_target, const char *refs_heads_master,
1692 const char *logmsg)
41b625b0
NP
1693{
1694 const char *lockpath;
1695 char ref[1000];
1696 int fd, len, written;
a4f34cbb 1697 char *git_HEAD = git_pathdup("%s", ref_target);
8b5157e4
NP
1698 unsigned char old_sha1[20], new_sha1[20];
1699
1700 if (logmsg && read_ref(ref_target, old_sha1))
1701 hashclr(old_sha1);
41b625b0 1702
d48744d1
JH
1703 if (safe_create_leading_directories(git_HEAD) < 0)
1704 return error("unable to create directory for %s", git_HEAD);
1705
41b625b0
NP
1706#ifndef NO_SYMLINK_HEAD
1707 if (prefer_symlink_refs) {
1708 unlink(git_HEAD);
1709 if (!symlink(refs_heads_master, git_HEAD))
8b5157e4 1710 goto done;
41b625b0
NP
1711 fprintf(stderr, "no symlink - falling back to symbolic ref\n");
1712 }
1713#endif
1714
1715 len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
1716 if (sizeof(ref) <= len) {
1717 error("refname too long: %s", refs_heads_master);
47fc52e2 1718 goto error_free_return;
41b625b0
NP
1719 }
1720 lockpath = mkpath("%s.lock", git_HEAD);
1721 fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
1722 if (fd < 0) {
1723 error("Unable to open %s for writing", lockpath);
47fc52e2 1724 goto error_free_return;
41b625b0
NP
1725 }
1726 written = write_in_full(fd, ref, len);
91c8d590 1727 if (close(fd) != 0 || written != len) {
41b625b0 1728 error("Unable to write to %s", lockpath);
47fc52e2 1729 goto error_unlink_return;
41b625b0
NP
1730 }
1731 if (rename(lockpath, git_HEAD) < 0) {
41b625b0 1732 error("Unable to create %s", git_HEAD);
47fc52e2 1733 goto error_unlink_return;
41b625b0
NP
1734 }
1735 if (adjust_shared_perm(git_HEAD)) {
41b625b0 1736 error("Unable to fix permissions on %s", lockpath);
47fc52e2 1737 error_unlink_return:
691f1a28 1738 unlink_or_warn(lockpath);
47fc52e2
JH
1739 error_free_return:
1740 free(git_HEAD);
1741 return -1;
41b625b0 1742 }
8b5157e4 1743
ee96d11b 1744#ifndef NO_SYMLINK_HEAD
8b5157e4 1745 done:
ee96d11b 1746#endif
8b5157e4
NP
1747 if (logmsg && !read_ref(refs_heads_master, new_sha1))
1748 log_ref_write(ref_target, old_sha1, new_sha1, logmsg);
1749
47fc52e2 1750 free(git_HEAD);
41b625b0
NP
1751 return 0;
1752}
1753
16d7cc90
JH
1754static char *ref_msg(const char *line, const char *endp)
1755{
1756 const char *ep;
16d7cc90 1757 line += 82;
182af834
PH
1758 ep = memchr(line, '\n', endp - line);
1759 if (!ep)
1760 ep = endp;
1761 return xmemdupz(line, ep - line);
16d7cc90
JH
1762}
1763
dfefa935
MH
1764int read_ref_at(const char *refname, unsigned long at_time, int cnt,
1765 unsigned char *sha1, char **msg,
1766 unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
d556fae2 1767{
e5229042 1768 const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
d556fae2 1769 char *tz_c;
e29cb53a 1770 int logfd, tz, reccnt = 0;
d556fae2
SP
1771 struct stat st;
1772 unsigned long date;
e5229042 1773 unsigned char logged_sha1[20];
cb48cb58 1774 void *log_mapped;
dc49cd76 1775 size_t mapsz;
d556fae2 1776
dfefa935 1777 logfile = git_path("logs/%s", refname);
d556fae2
SP
1778 logfd = open(logfile, O_RDONLY, 0);
1779 if (logfd < 0)
d824cbba 1780 die_errno("Unable to read log '%s'", logfile);
d556fae2
SP
1781 fstat(logfd, &st);
1782 if (!st.st_size)
1783 die("Log %s is empty.", logfile);
dc49cd76
SP
1784 mapsz = xsize_t(st.st_size);
1785 log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0);
cb48cb58 1786 logdata = log_mapped;
d556fae2
SP
1787 close(logfd);
1788
e5229042 1789 lastrec = NULL;
d556fae2
SP
1790 rec = logend = logdata + st.st_size;
1791 while (logdata < rec) {
e29cb53a 1792 reccnt++;
d556fae2
SP
1793 if (logdata < rec && *(rec-1) == '\n')
1794 rec--;
e5229042
SP
1795 lastgt = NULL;
1796 while (logdata < rec && *(rec-1) != '\n') {
d556fae2 1797 rec--;
e5229042
SP
1798 if (*rec == '>')
1799 lastgt = rec;
1800 }
1801 if (!lastgt)
d556fae2 1802 die("Log %s is corrupt.", logfile);
e5229042 1803 date = strtoul(lastgt + 1, &tz_c, 10);
ab2a1a32 1804 if (date <= at_time || cnt == 0) {
76a44c5c 1805 tz = strtoul(tz_c, NULL, 10);
16d7cc90
JH
1806 if (msg)
1807 *msg = ref_msg(rec, logend);
1808 if (cutoff_time)
1809 *cutoff_time = date;
1810 if (cutoff_tz)
1811 *cutoff_tz = tz;
1812 if (cutoff_cnt)
76a44c5c 1813 *cutoff_cnt = reccnt - 1;
e5229042
SP
1814 if (lastrec) {
1815 if (get_sha1_hex(lastrec, logged_sha1))
1816 die("Log %s is corrupt.", logfile);
1817 if (get_sha1_hex(rec + 41, sha1))
1818 die("Log %s is corrupt.", logfile);
a89fccd2 1819 if (hashcmp(logged_sha1, sha1)) {
edbc25c5 1820 warning("Log %s has gap after %s.",
73013afd 1821 logfile, show_date(date, tz, DATE_RFC2822));
e5229042 1822 }
e5f38ec3
JH
1823 }
1824 else if (date == at_time) {
e5229042
SP
1825 if (get_sha1_hex(rec + 41, sha1))
1826 die("Log %s is corrupt.", logfile);
e5f38ec3
JH
1827 }
1828 else {
e5229042
SP
1829 if (get_sha1_hex(rec + 41, logged_sha1))
1830 die("Log %s is corrupt.", logfile);
a89fccd2 1831 if (hashcmp(logged_sha1, sha1)) {
edbc25c5 1832 warning("Log %s unexpectedly ended on %s.",
73013afd 1833 logfile, show_date(date, tz, DATE_RFC2822));
e5229042
SP
1834 }
1835 }
dc49cd76 1836 munmap(log_mapped, mapsz);
d556fae2
SP
1837 return 0;
1838 }
e5229042 1839 lastrec = rec;
ab2a1a32
JH
1840 if (cnt > 0)
1841 cnt--;
d556fae2
SP
1842 }
1843
e5229042
SP
1844 rec = logdata;
1845 while (rec < logend && *rec != '>' && *rec != '\n')
1846 rec++;
1847 if (rec == logend || *rec == '\n')
d556fae2 1848 die("Log %s is corrupt.", logfile);
e5229042 1849 date = strtoul(rec + 1, &tz_c, 10);
d556fae2
SP
1850 tz = strtoul(tz_c, NULL, 10);
1851 if (get_sha1_hex(logdata, sha1))
1852 die("Log %s is corrupt.", logfile);
d1a4489a
JK
1853 if (is_null_sha1(sha1)) {
1854 if (get_sha1_hex(logdata + 41, sha1))
1855 die("Log %s is corrupt.", logfile);
1856 }
16d7cc90
JH
1857 if (msg)
1858 *msg = ref_msg(logdata, logend);
dc49cd76 1859 munmap(log_mapped, mapsz);
16d7cc90
JH
1860
1861 if (cutoff_time)
1862 *cutoff_time = date;
1863 if (cutoff_tz)
1864 *cutoff_tz = tz;
1865 if (cutoff_cnt)
1866 *cutoff_cnt = reccnt;
1867 return 1;
d556fae2 1868}
2ff81662 1869
dfefa935 1870int for_each_recent_reflog_ent(const char *refname, each_reflog_ent_fn fn, long ofs, void *cb_data)
2ff81662
JH
1871{
1872 const char *logfile;
1873 FILE *logfp;
8ca78803 1874 struct strbuf sb = STRBUF_INIT;
2266bf27 1875 int ret = 0;
2ff81662 1876
dfefa935 1877 logfile = git_path("logs/%s", refname);
2ff81662
JH
1878 logfp = fopen(logfile, "r");
1879 if (!logfp)
883d60fa 1880 return -1;
101d15e0
JH
1881
1882 if (ofs) {
1883 struct stat statbuf;
1884 if (fstat(fileno(logfp), &statbuf) ||
1885 statbuf.st_size < ofs ||
1886 fseek(logfp, -ofs, SEEK_END) ||
8ca78803 1887 strbuf_getwholeline(&sb, logfp, '\n')) {
9d33f7c2 1888 fclose(logfp);
8ca78803 1889 strbuf_release(&sb);
101d15e0 1890 return -1;
9d33f7c2 1891 }
101d15e0
JH
1892 }
1893
8ca78803 1894 while (!strbuf_getwholeline(&sb, logfp, '\n')) {
2ff81662 1895 unsigned char osha1[20], nsha1[20];
883d60fa
JS
1896 char *email_end, *message;
1897 unsigned long timestamp;
8ca78803 1898 int tz;
2ff81662
JH
1899
1900 /* old SP new SP name <email> SP time TAB msg LF */
8ca78803
RS
1901 if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' ||
1902 get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' ||
1903 get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' ||
1904 !(email_end = strchr(sb.buf + 82, '>')) ||
883d60fa
JS
1905 email_end[1] != ' ' ||
1906 !(timestamp = strtoul(email_end + 2, &message, 10)) ||
1907 !message || message[0] != ' ' ||
1908 (message[1] != '+' && message[1] != '-') ||
1909 !isdigit(message[2]) || !isdigit(message[3]) ||
b4dd4856 1910 !isdigit(message[4]) || !isdigit(message[5]))
2ff81662 1911 continue; /* corrupt? */
883d60fa
JS
1912 email_end[1] = '\0';
1913 tz = strtol(message + 1, NULL, 10);
b4dd4856
JS
1914 if (message[6] != '\t')
1915 message += 6;
1916 else
1917 message += 7;
8ca78803
RS
1918 ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message,
1919 cb_data);
883d60fa 1920 if (ret)
2266bf27 1921 break;
2ff81662
JH
1922 }
1923 fclose(logfp);
8ca78803 1924 strbuf_release(&sb);
2266bf27 1925 return ret;
2ff81662 1926}
e29cb53a 1927
dfefa935 1928int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data)
101d15e0 1929{
dfefa935 1930 return for_each_recent_reflog_ent(refname, fn, 0, cb_data);
101d15e0
JH
1931}
1932
eb8381c8
NP
1933static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data)
1934{
1935 DIR *dir = opendir(git_path("logs/%s", base));
fcee5a14 1936 int retval = 0;
eb8381c8
NP
1937
1938 if (dir) {
1939 struct dirent *de;
1940 int baselen = strlen(base);
1941 char *log = xmalloc(baselen + 257);
1942
1943 memcpy(log, base, baselen);
1944 if (baselen && base[baselen-1] != '/')
1945 log[baselen++] = '/';
1946
1947 while ((de = readdir(dir)) != NULL) {
1948 struct stat st;
1949 int namelen;
1950
1951 if (de->d_name[0] == '.')
1952 continue;
1953 namelen = strlen(de->d_name);
1954 if (namelen > 255)
1955 continue;
1956 if (has_extension(de->d_name, ".lock"))
1957 continue;
1958 memcpy(log + baselen, de->d_name, namelen+1);
1959 if (stat(git_path("logs/%s", log), &st) < 0)
1960 continue;
1961 if (S_ISDIR(st.st_mode)) {
1962 retval = do_for_each_reflog(log, fn, cb_data);
1963 } else {
1964 unsigned char sha1[20];
c6893323 1965 if (read_ref_full(log, sha1, 0, NULL))
eb8381c8
NP
1966 retval = error("bad ref for %s", log);
1967 else
1968 retval = fn(log, sha1, 0, cb_data);
1969 }
1970 if (retval)
1971 break;
1972 }
1973 free(log);
1974 closedir(dir);
1975 }
acb39f64 1976 else if (*base)
fcee5a14 1977 return errno;
eb8381c8
NP
1978 return retval;
1979}
1980
1981int for_each_reflog(each_ref_fn fn, void *cb_data)
1982{
1983 return do_for_each_reflog("", fn, cb_data);
1984}
3d9f037c
CR
1985
1986int update_ref(const char *action, const char *refname,
1987 const unsigned char *sha1, const unsigned char *oldval,
1988 int flags, enum action_on_err onerr)
1989{
1990 static struct ref_lock *lock;
1991 lock = lock_any_ref_for_update(refname, oldval, flags);
1992 if (!lock) {
1993 const char *str = "Cannot lock the ref '%s'.";
1994 switch (onerr) {
1995 case MSG_ON_ERR: error(str, refname); break;
1996 case DIE_ON_ERR: die(str, refname); break;
1997 case QUIET_ON_ERR: break;
1998 }
1999 return 1;
2000 }
2001 if (write_ref_sha1(lock, sha1, action) < 0) {
2002 const char *str = "Cannot update the ref '%s'.";
2003 switch (onerr) {
2004 case MSG_ON_ERR: error(str, refname); break;
2005 case DIE_ON_ERR: die(str, refname); break;
2006 case QUIET_ON_ERR: break;
2007 }
2008 return 1;
2009 }
2010 return 0;
2011}
cda69f48 2012
2c5c66be 2013int ref_exists(const char *refname)
c17b2294
JH
2014{
2015 unsigned char sha1[20];
2016 return !!resolve_ref(refname, sha1, 1, NULL);
2017}
2018
5483f799 2019struct ref *find_ref_by_name(const struct ref *list, const char *name)
cda69f48
JK
2020{
2021 for ( ; list; list = list->next)
2022 if (!strcmp(list->name, name))
5483f799 2023 return (struct ref *)list;
cda69f48
JK
2024 return NULL;
2025}
7c2b3029
JK
2026
2027/*
2028 * generate a format suitable for scanf from a ref_rev_parse_rules
2029 * rule, that is replace the "%.*s" spec with a "%s" spec
2030 */
2031static void gen_scanf_fmt(char *scanf_fmt, const char *rule)
2032{
2033 char *spec;
2034
2035 spec = strstr(rule, "%.*s");
2036 if (!spec || strstr(spec + 4, "%.*s"))
2037 die("invalid rule in ref_rev_parse_rules: %s", rule);
2038
2039 /* copy all until spec */
2040 strncpy(scanf_fmt, rule, spec - rule);
2041 scanf_fmt[spec - rule] = '\0';
2042 /* copy new spec */
2043 strcat(scanf_fmt, "%s");
2044 /* copy remaining rule */
2045 strcat(scanf_fmt, spec + 4);
2046
2047 return;
2048}
2049
dfefa935 2050char *shorten_unambiguous_ref(const char *refname, int strict)
7c2b3029
JK
2051{
2052 int i;
2053 static char **scanf_fmts;
2054 static int nr_rules;
2055 char *short_name;
2056
2057 /* pre generate scanf formats from ref_rev_parse_rules[] */
2058 if (!nr_rules) {
2059 size_t total_len = 0;
2060
2061 /* the rule list is NULL terminated, count them first */
2062 for (; ref_rev_parse_rules[nr_rules]; nr_rules++)
2063 /* no +1 because strlen("%s") < strlen("%.*s") */
2064 total_len += strlen(ref_rev_parse_rules[nr_rules]);
2065
2066 scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len);
2067
2068 total_len = 0;
2069 for (i = 0; i < nr_rules; i++) {
2070 scanf_fmts[i] = (char *)&scanf_fmts[nr_rules]
2071 + total_len;
2072 gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]);
2073 total_len += strlen(ref_rev_parse_rules[i]);
2074 }
2075 }
2076
2077 /* bail out if there are no rules */
2078 if (!nr_rules)
dfefa935 2079 return xstrdup(refname);
7c2b3029 2080
dfefa935
MH
2081 /* buffer for scanf result, at most refname must fit */
2082 short_name = xstrdup(refname);
7c2b3029
JK
2083
2084 /* skip first rule, it will always match */
2085 for (i = nr_rules - 1; i > 0 ; --i) {
2086 int j;
6e7b3309 2087 int rules_to_fail = i;
7c2b3029
JK
2088 int short_name_len;
2089
dfefa935 2090 if (1 != sscanf(refname, scanf_fmts[i], short_name))
7c2b3029
JK
2091 continue;
2092
2093 short_name_len = strlen(short_name);
2094
6e7b3309
BW
2095 /*
2096 * in strict mode, all (except the matched one) rules
2097 * must fail to resolve to a valid non-ambiguous ref
2098 */
2099 if (strict)
2100 rules_to_fail = nr_rules;
2101
7c2b3029
JK
2102 /*
2103 * check if the short name resolves to a valid ref,
2104 * but use only rules prior to the matched one
2105 */
6e7b3309 2106 for (j = 0; j < rules_to_fail; j++) {
7c2b3029 2107 const char *rule = ref_rev_parse_rules[j];
7c2b3029
JK
2108 char refname[PATH_MAX];
2109
6e7b3309
BW
2110 /* skip matched rule */
2111 if (i == j)
2112 continue;
2113
7c2b3029
JK
2114 /*
2115 * the short name is ambiguous, if it resolves
2116 * (with this previous rule) to a valid ref
2117 * read_ref() returns 0 on success
2118 */
2119 mksnpath(refname, sizeof(refname),
2120 rule, short_name_len, short_name);
c6893323 2121 if (ref_exists(refname))
7c2b3029
JK
2122 break;
2123 }
2124
2125 /*
2126 * short name is non-ambiguous if all previous rules
2127 * haven't resolved to a valid ref
2128 */
6e7b3309 2129 if (j == rules_to_fail)
7c2b3029
JK
2130 return short_name;
2131 }
2132
2133 free(short_name);
dfefa935 2134 return xstrdup(refname);
7c2b3029 2135}