pack_refs(): remove redundant check
[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
cddc4258
MH
56static struct ref_entry *create_ref_entry(const char *refname,
57 const unsigned char *sha1, int flag,
58 int check_name)
e1e22e37
LT
59{
60 int len;
cddc4258 61 struct ref_entry *ref;
e1e22e37 62
09116a1c 63 if (check_name &&
dfefa935
MH
64 check_refname_format(refname, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT))
65 die("Reference has invalid format: '%s'", refname);
cddc4258
MH
66 len = strlen(refname) + 1;
67 ref = xmalloc(sizeof(struct ref_entry) + len);
68 hashcpy(ref->sha1, sha1);
69 hashclr(ref->peeled);
70 memcpy(ref->name, refname, len);
71 ref->flag = flag;
72 return ref;
73}
74
75/* Add a ref_entry to the end of the ref_array (unsorted). */
dd73ecd1 76static void add_ref(struct ref_array *refs, struct ref_entry *ref)
cddc4258 77{
e9c4c111 78 ALLOC_GROW(refs->refs, refs->nr + 1, refs->alloc);
cddc4258 79 refs->refs[refs->nr++] = ref;
c774aab9
JP
80}
81
e9c4c111 82static int ref_entry_cmp(const void *a, const void *b)
c774aab9 83{
e9c4c111
JP
84 struct ref_entry *one = *(struct ref_entry **)a;
85 struct ref_entry *two = *(struct ref_entry **)b;
86 return strcmp(one->name, two->name);
87}
c774aab9 88
202a56a9
MH
89/*
90 * Emit a warning and return true iff ref1 and ref2 have the same name
91 * and the same sha1. Die if they have the same name but different
92 * sha1s.
93 */
94static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2)
95{
96 if (!strcmp(ref1->name, ref2->name)) {
97 /* Duplicate name; make sure that the SHA1s match: */
98 if (hashcmp(ref1->sha1, ref2->sha1))
99 die("Duplicated ref, and SHA1s don't match: %s",
100 ref1->name);
101 warning("Duplicated ref: %s", ref1->name);
102 return 1;
103 } else {
104 return 0;
105 }
106}
107
e9c4c111
JP
108static void sort_ref_array(struct ref_array *array)
109{
202a56a9 110 int i, j;
c774aab9 111
e9c4c111
JP
112 /* Nothing to sort unless there are at least two entries */
113 if (array->nr < 2)
114 return;
c774aab9 115
e9c4c111 116 qsort(array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp);
c774aab9 117
e9c4c111 118 /* Remove any duplicates from the ref_array */
202a56a9
MH
119 i = 0;
120 for (j = 1; j < array->nr; j++) {
121 if (is_dup_ref(array->refs[i], array->refs[j])) {
122 free(array->refs[j]);
e9c4c111
JP
123 continue;
124 }
202a56a9 125 array->refs[++i] = array->refs[j];
e9c4c111
JP
126 }
127 array->nr = i + 1;
128}
c774aab9 129
dfefa935 130static struct ref_entry *search_ref_array(struct ref_array *array, const char *refname)
e9c4c111
JP
131{
132 struct ref_entry *e, **r;
133 int len;
c774aab9 134
dfefa935 135 if (refname == NULL)
e9c4c111 136 return NULL;
c774aab9 137
68729696
BC
138 if (!array->nr)
139 return NULL;
c774aab9 140
dfefa935 141 len = strlen(refname) + 1;
e9c4c111 142 e = xmalloc(sizeof(struct ref_entry) + len);
dfefa935 143 memcpy(e->name, refname, len);
c774aab9 144
e9c4c111 145 r = bsearch(&e, array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp);
c774aab9 146
e9c4c111 147 free(e);
c774aab9 148
e9c4c111
JP
149 if (r == NULL)
150 return NULL;
c774aab9 151
e9c4c111 152 return *r;
e1e22e37
LT
153}
154
5e290ff7
JH
155/*
156 * Future: need to be in "struct repository"
157 * when doing a full libification.
158 */
79c7ca54
MH
159static struct ref_cache {
160 struct ref_cache *next;
5e290ff7
JH
161 char did_loose;
162 char did_packed;
e9c4c111
JP
163 struct ref_array loose;
164 struct ref_array packed;
ce40979c
MH
165 /* The submodule name, or "" for the main repo. */
166 char name[FLEX_ARRAY];
79c7ca54 167} *ref_cache;
0e88c130 168
e9c4c111 169static struct ref_entry *current_ref;
5e290ff7 170
e9c4c111 171static struct ref_array extra_refs;
e142a3c6 172
7c59511e 173static void clear_ref_array(struct ref_array *array)
5e290ff7 174{
e9c4c111
JP
175 int i;
176 for (i = 0; i < array->nr; i++)
177 free(array->refs[i]);
178 free(array->refs);
179 array->nr = array->alloc = 0;
180 array->refs = NULL;
5e290ff7
JH
181}
182
760c4512 183static void clear_packed_ref_cache(struct ref_cache *refs)
e1e22e37 184{
1b7edaf9 185 if (refs->did_packed)
7c59511e 186 clear_ref_array(&refs->packed);
760c4512 187 refs->did_packed = 0;
5e290ff7 188}
e1e22e37 189
760c4512
MH
190static void clear_loose_ref_cache(struct ref_cache *refs)
191{
192 if (refs->did_loose)
7c59511e 193 clear_ref_array(&refs->loose);
760c4512
MH
194 refs->did_loose = 0;
195}
196
79c7ca54 197static struct ref_cache *create_ref_cache(const char *submodule)
e5dbf605 198{
ce40979c 199 int len;
79c7ca54 200 struct ref_cache *refs;
ce40979c
MH
201 if (!submodule)
202 submodule = "";
203 len = strlen(submodule) + 1;
79c7ca54 204 refs = xcalloc(1, sizeof(struct ref_cache) + len);
ce40979c 205 memcpy(refs->name, submodule, len);
e5dbf605
MH
206 return refs;
207}
208
4349a668 209/*
79c7ca54 210 * Return a pointer to a ref_cache for the specified submodule. For
4349a668
MH
211 * the main repository, use submodule==NULL. The returned structure
212 * will be allocated and initialized but not necessarily populated; it
213 * should not be freed.
214 */
79c7ca54 215static struct ref_cache *get_ref_cache(const char *submodule)
4349a668 216{
79c7ca54 217 struct ref_cache *refs = ref_cache;
0e88c130
MH
218 if (!submodule)
219 submodule = "";
220 while (refs) {
221 if (!strcmp(submodule, refs->name))
222 return refs;
223 refs = refs->next;
4349a668 224 }
0e88c130 225
79c7ca54
MH
226 refs = create_ref_cache(submodule);
227 refs->next = ref_cache;
228 ref_cache = refs;
0e88c130 229 return refs;
4349a668
MH
230}
231
8be8bde7 232void invalidate_ref_cache(const char *submodule)
f130b116 233{
c5f29abd
MH
234 struct ref_cache *refs = get_ref_cache(submodule);
235 clear_packed_ref_cache(refs);
236 clear_loose_ref_cache(refs);
5e290ff7 237}
e1e22e37 238
2c5c66be 239static void read_packed_refs(FILE *f, struct ref_array *array)
f4204ab9 240{
e9c4c111 241 struct ref_entry *last = NULL;
f4204ab9
JH
242 char refline[PATH_MAX];
243 int flag = REF_ISPACKED;
244
245 while (fgets(refline, sizeof(refline), f)) {
246 unsigned char sha1[20];
dfefa935 247 const char *refname;
f4204ab9
JH
248 static const char header[] = "# pack-refs with:";
249
250 if (!strncmp(refline, header, sizeof(header)-1)) {
251 const char *traits = refline + sizeof(header) - 1;
252 if (strstr(traits, " peeled "))
253 flag |= REF_KNOWS_PEELED;
254 /* perhaps other traits later as well */
255 continue;
256 }
257
dfefa935
MH
258 refname = parse_ref_line(refline, sha1);
259 if (refname) {
dd73ecd1
MH
260 last = create_ref_entry(refname, sha1, flag, 1);
261 add_ref(array, last);
f4204ab9
JH
262 continue;
263 }
264 if (last &&
265 refline[0] == '^' &&
266 strlen(refline) == 42 &&
267 refline[41] == '\n' &&
268 !get_sha1_hex(refline + 1, sha1))
269 hashcpy(last->peeled, sha1);
270 }
2c5c66be 271 sort_ref_array(array);
f4204ab9
JH
272}
273
dfefa935 274void add_extra_ref(const char *refname, const unsigned char *sha1, int flag)
e142a3c6 275{
dd73ecd1 276 add_ref(&extra_refs, create_ref_entry(refname, sha1, flag, 0));
e142a3c6
DB
277}
278
279void clear_extra_refs(void)
280{
7c59511e 281 clear_ref_array(&extra_refs);
e142a3c6
DB
282}
283
316b097a 284static struct ref_array *get_packed_refs(struct ref_cache *refs)
5e290ff7 285{
4349a668
MH
286 if (!refs->did_packed) {
287 const char *packed_refs_file;
288 FILE *f;
0bad611b 289
316b097a
MH
290 if (*refs->name)
291 packed_refs_file = git_path_submodule(refs->name, "packed-refs");
4349a668
MH
292 else
293 packed_refs_file = git_path("packed-refs");
294 f = fopen(packed_refs_file, "r");
e1e22e37 295 if (f) {
2c5c66be 296 read_packed_refs(f, &refs->packed);
e1e22e37 297 fclose(f);
e1e22e37 298 }
0bad611b 299 refs->did_packed = 1;
e1e22e37 300 }
e9c4c111 301 return &refs->packed;
e1e22e37
LT
302}
303
3b124823 304static void get_ref_dir(struct ref_cache *refs, const char *base,
e9c4c111 305 struct ref_array *array)
e1e22e37 306{
0bad611b
HV
307 DIR *dir;
308 const char *path;
309
3b124823
MH
310 if (*refs->name)
311 path = git_path_submodule(refs->name, "%s", base);
0bad611b
HV
312 else
313 path = git_path("%s", base);
314
315
316 dir = opendir(path);
e1e22e37
LT
317
318 if (dir) {
319 struct dirent *de;
320 int baselen = strlen(base);
dfefa935 321 char *refname = xmalloc(baselen + 257);
e1e22e37 322
dfefa935 323 memcpy(refname, base, baselen);
e1e22e37 324 if (baselen && base[baselen-1] != '/')
dfefa935 325 refname[baselen++] = '/';
e1e22e37
LT
326
327 while ((de = readdir(dir)) != NULL) {
328 unsigned char sha1[20];
329 struct stat st;
8da19775 330 int flag;
e1e22e37 331 int namelen;
0bad611b 332 const char *refdir;
e1e22e37
LT
333
334 if (de->d_name[0] == '.')
335 continue;
336 namelen = strlen(de->d_name);
337 if (namelen > 255)
338 continue;
339 if (has_extension(de->d_name, ".lock"))
340 continue;
dfefa935 341 memcpy(refname + baselen, de->d_name, namelen+1);
3b124823
MH
342 refdir = *refs->name
343 ? git_path_submodule(refs->name, "%s", refname)
dfefa935 344 : git_path("%s", refname);
0bad611b 345 if (stat(refdir, &st) < 0)
e1e22e37
LT
346 continue;
347 if (S_ISDIR(st.st_mode)) {
3b124823 348 get_ref_dir(refs, refname, array);
e1e22e37
LT
349 continue;
350 }
3b124823 351 if (*refs->name) {
f8948e2f 352 hashclr(sha1);
0bad611b 353 flag = 0;
3b124823 354 if (resolve_gitlink_ref(refs->name, refname, sha1) < 0) {
0bad611b 355 hashclr(sha1);
98ac34b2 356 flag |= REF_ISBROKEN;
0bad611b 357 }
dfefa935 358 } else if (read_ref_full(refname, sha1, 1, &flag)) {
09116a1c
JH
359 hashclr(sha1);
360 flag |= REF_ISBROKEN;
361 }
dd73ecd1 362 add_ref(array, create_ref_entry(refname, sha1, flag, 1));
e1e22e37 363 }
dfefa935 364 free(refname);
e1e22e37
LT
365 closedir(dir);
366 }
e1e22e37
LT
367}
368
f8948e2f 369struct warn_if_dangling_data {
3cf6134a 370 FILE *fp;
f8948e2f
JH
371 const char *refname;
372 const char *msg_fmt;
373};
374
375static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1,
376 int flags, void *cb_data)
377{
378 struct warn_if_dangling_data *d = cb_data;
379 const char *resolves_to;
380 unsigned char junk[20];
381
382 if (!(flags & REF_ISSYMREF))
383 return 0;
384
8cad4744 385 resolves_to = resolve_ref_unsafe(refname, junk, 0, NULL);
f8948e2f
JH
386 if (!resolves_to || strcmp(resolves_to, d->refname))
387 return 0;
388
3cf6134a 389 fprintf(d->fp, d->msg_fmt, refname);
f8948e2f
JH
390 return 0;
391}
392
3cf6134a 393void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
f8948e2f 394{
66dbfd55
GV
395 struct warn_if_dangling_data data;
396
397 data.fp = fp;
398 data.refname = refname;
399 data.msg_fmt = msg_fmt;
f8948e2f
JH
400 for_each_rawref(warn_if_dangling_symref, &data);
401}
402
316b097a 403static struct ref_array *get_loose_refs(struct ref_cache *refs)
e1e22e37 404{
4349a668 405 if (!refs->did_loose) {
3b124823 406 get_ref_dir(refs, "refs", &refs->loose);
2c5c66be 407 sort_ref_array(&refs->loose);
4349a668 408 refs->did_loose = 1;
e1e22e37 409 }
2c5c66be 410 return &refs->loose;
e1e22e37
LT
411}
412
ca8db142
LT
413/* We allow "recursive" symbolic refs. Only within reason, though */
414#define MAXDEPTH 5
0ebde32c
LT
415#define MAXREFLEN (1024)
416
e5fa45c1
JH
417/*
418 * Called by resolve_gitlink_ref_recursive() after it failed to read
b0626608
MH
419 * from the loose refs in ref_cache refs. Find <refname> in the
420 * packed-refs file for the submodule.
e5fa45c1 421 */
b0626608 422static int resolve_gitlink_packed_ref(struct ref_cache *refs,
85be1fe3 423 const char *refname, unsigned char *sha1)
0ebde32c 424{
2c5c66be 425 struct ref_entry *ref;
b0626608 426 struct ref_array *array = get_packed_refs(refs);
0ebde32c 427
2c5c66be 428 ref = search_ref_array(array, refname);
b0626608
MH
429 if (ref == NULL)
430 return -1;
431
432 memcpy(sha1, ref->sha1, 20);
433 return 0;
0ebde32c
LT
434}
435
b0626608 436static int resolve_gitlink_ref_recursive(struct ref_cache *refs,
85be1fe3 437 const char *refname, unsigned char *sha1,
dfefa935 438 int recursion)
0ebde32c 439{
064d51dc 440 int fd, len;
0ebde32c 441 char buffer[128], *p;
064d51dc 442 char *path;
0ebde32c 443
064d51dc 444 if (recursion > MAXDEPTH || strlen(refname) > MAXREFLEN)
0ebde32c 445 return -1;
064d51dc
MH
446 path = *refs->name
447 ? git_path_submodule(refs->name, "%s", refname)
448 : git_path("%s", refname);
449 fd = open(path, O_RDONLY);
0ebde32c 450 if (fd < 0)
b0626608 451 return resolve_gitlink_packed_ref(refs, refname, sha1);
0ebde32c
LT
452
453 len = read(fd, buffer, sizeof(buffer)-1);
454 close(fd);
455 if (len < 0)
456 return -1;
457 while (len && isspace(buffer[len-1]))
458 len--;
459 buffer[len] = 0;
460
461 /* Was it a detached head or an old-fashioned symlink? */
85be1fe3 462 if (!get_sha1_hex(buffer, sha1))
0ebde32c
LT
463 return 0;
464
465 /* Symref? */
466 if (strncmp(buffer, "ref:", 4))
467 return -1;
468 p = buffer + 4;
469 while (isspace(*p))
470 p++;
471
064d51dc 472 return resolve_gitlink_ref_recursive(refs, p, sha1, recursion+1);
0ebde32c
LT
473}
474
85be1fe3 475int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1)
0ebde32c
LT
476{
477 int len = strlen(path), retval;
064d51dc 478 char *submodule;
b0626608 479 struct ref_cache *refs;
0ebde32c
LT
480
481 while (len && path[len-1] == '/')
482 len--;
483 if (!len)
484 return -1;
b0626608
MH
485 submodule = xstrndup(path, len);
486 refs = get_ref_cache(submodule);
487 free(submodule);
488
064d51dc 489 retval = resolve_gitlink_ref_recursive(refs, refname, sha1, 0);
0ebde32c
LT
490 return retval;
491}
ca8db142 492
4886b89f 493/*
c224ca7f
MH
494 * Try to read ref from the packed references. On success, set sha1
495 * and return 0; otherwise, return -1.
4886b89f 496 */
dfefa935 497static int get_packed_ref(const char *refname, unsigned char *sha1)
c224ca7f 498{
316b097a 499 struct ref_array *packed = get_packed_refs(get_ref_cache(NULL));
dfefa935 500 struct ref_entry *entry = search_ref_array(packed, refname);
2c5c66be
JH
501 if (entry) {
502 hashcpy(sha1, entry->sha1);
503 return 0;
c224ca7f
MH
504 }
505 return -1;
506}
507
8d68493f 508const char *resolve_ref_unsafe(const char *refname, unsigned char *sha1, int reading, int *flag)
8a65ff76 509{
0104ca09
HO
510 int depth = MAXDEPTH;
511 ssize_t len;
a876ed83 512 char buffer[256];
dfefa935 513 static char refname_buffer[256];
ca8db142 514
8da19775
JH
515 if (flag)
516 *flag = 0;
517
dfefa935 518 if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
8384d788
MH
519 return NULL;
520
a876ed83 521 for (;;) {
55956350 522 char path[PATH_MAX];
a876ed83
JH
523 struct stat st;
524 char *buf;
525 int fd;
8a65ff76 526
a876ed83
JH
527 if (--depth < 0)
528 return NULL;
ca8db142 529
dfefa935 530 git_snpath(path, sizeof(path), "%s", refname);
c224ca7f 531
a876ed83 532 if (lstat(path, &st) < 0) {
c224ca7f
MH
533 if (errno != ENOENT)
534 return NULL;
535 /*
536 * The loose reference file does not exist;
537 * check for a packed reference.
538 */
dfefa935 539 if (!get_packed_ref(refname, sha1)) {
c224ca7f
MH
540 if (flag)
541 *flag |= REF_ISPACKED;
dfefa935 542 return refname;
434cd0cd 543 }
c224ca7f
MH
544 /* The reference is not a packed reference, either. */
545 if (reading) {
a876ed83 546 return NULL;
c224ca7f
MH
547 } else {
548 hashclr(sha1);
dfefa935 549 return refname;
c224ca7f 550 }
a876ed83 551 }
ca8db142 552
a876ed83
JH
553 /* Follow "normalized" - ie "refs/.." symlinks by hand */
554 if (S_ISLNK(st.st_mode)) {
555 len = readlink(path, buffer, sizeof(buffer)-1);
7bb2bf8e
MH
556 if (len < 0)
557 return NULL;
b54cb795 558 buffer[len] = 0;
1f58a038
MH
559 if (!prefixcmp(buffer, "refs/") &&
560 !check_refname_format(buffer, 0)) {
dfefa935
MH
561 strcpy(refname_buffer, buffer);
562 refname = refname_buffer;
8da19775
JH
563 if (flag)
564 *flag |= REF_ISSYMREF;
a876ed83
JH
565 continue;
566 }
ca8db142 567 }
a876ed83 568
7a21632f
DS
569 /* Is it a directory? */
570 if (S_ISDIR(st.st_mode)) {
571 errno = EISDIR;
572 return NULL;
573 }
574
a876ed83
JH
575 /*
576 * Anything else, just open it and try to use it as
577 * a ref
578 */
579 fd = open(path, O_RDONLY);
580 if (fd < 0)
581 return NULL;
93d26e4c 582 len = read_in_full(fd, buffer, sizeof(buffer)-1);
a876ed83 583 close(fd);
28775050
MH
584 if (len < 0)
585 return NULL;
586 while (len && isspace(buffer[len-1]))
587 len--;
588 buffer[len] = '\0';
a876ed83
JH
589
590 /*
591 * Is it a symbolic ref?
592 */
28775050 593 if (prefixcmp(buffer, "ref:"))
a876ed83 594 break;
55956350
JH
595 if (flag)
596 *flag |= REF_ISSYMREF;
a876ed83 597 buf = buffer + 4;
28775050
MH
598 while (isspace(*buf))
599 buf++;
313fb010 600 if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) {
55956350
JH
601 if (flag)
602 *flag |= REF_ISBROKEN;
313fb010
MH
603 return NULL;
604 }
dfefa935 605 refname = strcpy(refname_buffer, buf);
8a65ff76 606 }
f989fea0
MH
607 /* Please note that FETCH_HEAD has a second line containing other data. */
608 if (get_sha1_hex(buffer, sha1) || (buffer[40] != '\0' && !isspace(buffer[40]))) {
55956350
JH
609 if (flag)
610 *flag |= REF_ISBROKEN;
a876ed83 611 return NULL;
629cd3ac 612 }
dfefa935 613 return refname;
a876ed83
JH
614}
615
96ec7b1e
NTND
616char *resolve_refdup(const char *ref, unsigned char *sha1, int reading, int *flag)
617{
8cad4744 618 const char *ret = resolve_ref_unsafe(ref, sha1, reading, flag);
96ec7b1e
NTND
619 return ret ? xstrdup(ret) : NULL;
620}
621
d08bae7e
IL
622/* The argument to filter_refs */
623struct ref_filter {
624 const char *pattern;
625 each_ref_fn *fn;
626 void *cb_data;
627};
628
dfefa935 629int read_ref_full(const char *refname, unsigned char *sha1, int reading, int *flags)
a876ed83 630{
8d68493f 631 if (resolve_ref_unsafe(refname, sha1, reading, flags))
a876ed83
JH
632 return 0;
633 return -1;
8a65ff76
LT
634}
635
dfefa935 636int read_ref(const char *refname, unsigned char *sha1)
c6893323 637{
dfefa935 638 return read_ref_full(refname, sha1, 1, NULL);
c6893323
NTND
639}
640
f8948e2f 641#define DO_FOR_EACH_INCLUDE_BROKEN 01
ef06b918 642static int do_one_ref(const char *base, each_ref_fn fn, int trim,
e9c4c111 643 int flags, void *cb_data, struct ref_entry *entry)
ef06b918 644{
b3cfc406 645 if (prefixcmp(entry->name, base))
ef06b918 646 return 0;
e01de1c9 647
f8948e2f 648 if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) {
98ac34b2
JH
649 if (entry->flag & REF_ISBROKEN)
650 return 0; /* ignore broken refs e.g. dangling symref */
f8948e2f
JH
651 if (!has_sha1_file(entry->sha1)) {
652 error("%s does not point to a valid object!", entry->name);
653 return 0;
654 }
ef06b918 655 }
0ae91be0 656 current_ref = entry;
ef06b918
JH
657 return fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
658}
659
85be1fe3 660static int filter_refs(const char *refname, const unsigned char *sha1, int flags,
dfefa935 661 void *data)
d08bae7e
IL
662{
663 struct ref_filter *filter = (struct ref_filter *)data;
dfefa935 664 if (fnmatch(filter->pattern, refname, 0))
d08bae7e 665 return 0;
85be1fe3 666 return filter->fn(refname, sha1, flags, filter->cb_data);
d08bae7e
IL
667}
668
dfefa935 669int peel_ref(const char *refname, unsigned char *sha1)
cf0adba7
JH
670{
671 int flag;
672 unsigned char base[20];
673 struct object *o;
674
dfefa935
MH
675 if (current_ref && (current_ref->name == refname
676 || !strcmp(current_ref->name, refname))) {
0ae91be0
SP
677 if (current_ref->flag & REF_KNOWS_PEELED) {
678 hashcpy(sha1, current_ref->peeled);
679 return 0;
680 }
681 hashcpy(base, current_ref->sha1);
682 goto fallback;
683 }
684
dfefa935 685 if (read_ref_full(refname, base, 1, &flag))
cf0adba7
JH
686 return -1;
687
688 if ((flag & REF_ISPACKED)) {
316b097a 689 struct ref_array *array = get_packed_refs(get_ref_cache(NULL));
dfefa935 690 struct ref_entry *r = search_ref_array(array, refname);
cf0adba7 691
e9c4c111
JP
692 if (r != NULL && r->flag & REF_KNOWS_PEELED) {
693 hashcpy(sha1, r->peeled);
694 return 0;
cf0adba7 695 }
cf0adba7
JH
696 }
697
0ae91be0 698fallback:
cf0adba7 699 o = parse_object(base);
8c87dc77 700 if (o && o->type == OBJ_TAG) {
dfefa935 701 o = deref_tag(o, refname, 0);
cf0adba7
JH
702 if (o) {
703 hashcpy(sha1, o->sha1);
704 return 0;
705 }
706 }
707 return -1;
708}
709
0bad611b
HV
710static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn,
711 int trim, int flags, void *cb_data)
8a65ff76 712{
e9c4c111 713 int retval = 0, i, p = 0, l = 0;
316b097a
MH
714 struct ref_cache *refs = get_ref_cache(submodule);
715 struct ref_array *packed = get_packed_refs(refs);
716 struct ref_array *loose = get_loose_refs(refs);
8a65ff76 717
e9c4c111 718 struct ref_array *extra = &extra_refs;
e142a3c6 719
e9c4c111
JP
720 for (i = 0; i < extra->nr; i++)
721 retval = do_one_ref(base, fn, trim, flags, cb_data, extra->refs[i]);
e142a3c6 722
e9c4c111
JP
723 while (p < packed->nr && l < loose->nr) {
724 struct ref_entry *entry;
725 int cmp = strcmp(packed->refs[p]->name, loose->refs[l]->name);
e1e22e37 726 if (!cmp) {
e9c4c111 727 p++;
e1e22e37 728 continue;
6cada6a9 729 }
e1e22e37 730 if (cmp > 0) {
e9c4c111 731 entry = loose->refs[l++];
e1e22e37 732 } else {
e9c4c111 733 entry = packed->refs[p++];
e1e22e37 734 }
f8948e2f 735 retval = do_one_ref(base, fn, trim, flags, cb_data, entry);
e1e22e37 736 if (retval)
0ae91be0 737 goto end_each;
e1e22e37 738 }
8a65ff76 739
e9c4c111
JP
740 if (l < loose->nr) {
741 p = l;
742 packed = loose;
743 }
744
745 for (; p < packed->nr; p++) {
746 retval = do_one_ref(base, fn, trim, flags, cb_data, packed->refs[p]);
ef06b918 747 if (retval)
0ae91be0 748 goto end_each;
8a65ff76 749 }
0ae91be0
SP
750
751end_each:
752 current_ref = NULL;
753 return retval;
8a65ff76
LT
754}
755
0bad611b
HV
756
757static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data)
723c31fe
LT
758{
759 unsigned char sha1[20];
8da19775
JH
760 int flag;
761
0bad611b
HV
762 if (submodule) {
763 if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0)
764 return fn("HEAD", sha1, 0, cb_data);
765
766 return 0;
767 }
768
c6893323 769 if (!read_ref_full("HEAD", sha1, 1, &flag))
8da19775 770 return fn("HEAD", sha1, flag, cb_data);
0bad611b 771
2f34ba32 772 return 0;
723c31fe
LT
773}
774
0bad611b
HV
775int head_ref(each_ref_fn fn, void *cb_data)
776{
777 return do_head_ref(NULL, fn, cb_data);
778}
779
9ef6aeb0
HV
780int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
781{
782 return do_head_ref(submodule, fn, cb_data);
783}
784
cb5d709f 785int for_each_ref(each_ref_fn fn, void *cb_data)
8a65ff76 786{
b3cfc406 787 return do_for_each_ref(NULL, "", fn, 0, 0, cb_data);
a62be77f
SE
788}
789
9ef6aeb0
HV
790int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
791{
b3cfc406 792 return do_for_each_ref(submodule, "", fn, 0, 0, cb_data);
a62be77f
SE
793}
794
2a8177b6
CC
795int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
796{
0bad611b 797 return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data);
2a8177b6
CC
798}
799
9ef6aeb0
HV
800int for_each_ref_in_submodule(const char *submodule, const char *prefix,
801 each_ref_fn fn, void *cb_data)
802{
803 return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data);
2a8177b6
CC
804}
805
cb5d709f 806int for_each_tag_ref(each_ref_fn fn, void *cb_data)
a62be77f 807{
2a8177b6 808 return for_each_ref_in("refs/tags/", fn, cb_data);
a62be77f
SE
809}
810
9ef6aeb0
HV
811int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
812{
813 return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data);
814}
815
cb5d709f 816int for_each_branch_ref(each_ref_fn fn, void *cb_data)
a62be77f 817{
2a8177b6 818 return for_each_ref_in("refs/heads/", fn, cb_data);
a62be77f
SE
819}
820
9ef6aeb0
HV
821int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
822{
823 return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data);
824}
825
cb5d709f 826int for_each_remote_ref(each_ref_fn fn, void *cb_data)
a62be77f 827{
2a8177b6 828 return for_each_ref_in("refs/remotes/", fn, cb_data);
f8948e2f
JH
829}
830
9ef6aeb0
HV
831int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
832{
833 return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data);
834}
835
29268700
CC
836int for_each_replace_ref(each_ref_fn fn, void *cb_data)
837{
0bad611b 838 return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data);
29268700
CC
839}
840
a1bea2c1
JT
841int head_ref_namespaced(each_ref_fn fn, void *cb_data)
842{
843 struct strbuf buf = STRBUF_INIT;
844 int ret = 0;
845 unsigned char sha1[20];
846 int flag;
847
848 strbuf_addf(&buf, "%sHEAD", get_git_namespace());
c6893323 849 if (!read_ref_full(buf.buf, sha1, 1, &flag))
a1bea2c1
JT
850 ret = fn(buf.buf, sha1, flag, cb_data);
851 strbuf_release(&buf);
852
853 return ret;
854}
855
856int for_each_namespaced_ref(each_ref_fn fn, void *cb_data)
857{
858 struct strbuf buf = STRBUF_INIT;
859 int ret;
860 strbuf_addf(&buf, "%srefs/", get_git_namespace());
861 ret = do_for_each_ref(NULL, buf.buf, fn, 0, 0, cb_data);
862 strbuf_release(&buf);
863 return ret;
864}
865
b09fe971
IL
866int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
867 const char *prefix, void *cb_data)
d08bae7e
IL
868{
869 struct strbuf real_pattern = STRBUF_INIT;
870 struct ref_filter filter;
d08bae7e
IL
871 int ret;
872
b09fe971 873 if (!prefix && prefixcmp(pattern, "refs/"))
d08bae7e 874 strbuf_addstr(&real_pattern, "refs/");
b09fe971
IL
875 else if (prefix)
876 strbuf_addstr(&real_pattern, prefix);
d08bae7e
IL
877 strbuf_addstr(&real_pattern, pattern);
878
894a9d33 879 if (!has_glob_specials(pattern)) {
9517e6b8 880 /* Append implied '/' '*' if not present. */
d08bae7e
IL
881 if (real_pattern.buf[real_pattern.len - 1] != '/')
882 strbuf_addch(&real_pattern, '/');
883 /* No need to check for '*', there is none. */
884 strbuf_addch(&real_pattern, '*');
885 }
886
887 filter.pattern = real_pattern.buf;
888 filter.fn = fn;
889 filter.cb_data = cb_data;
890 ret = for_each_ref(filter_refs, &filter);
891
892 strbuf_release(&real_pattern);
893 return ret;
894}
895
b09fe971
IL
896int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data)
897{
898 return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
899}
900
f8948e2f
JH
901int for_each_rawref(each_ref_fn fn, void *cb_data)
902{
b3cfc406 903 return do_for_each_ref(NULL, "", fn, 0,
f8948e2f 904 DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
8a65ff76
LT
905}
906
03feddd6
JH
907/*
908 * Make sure "ref" is something reasonable to have under ".git/refs/";
909 * We do not like it if:
910 *
911 * - any path component of it begins with ".", or
912 * - it has double dots "..", or
913 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
914 * - it ends with a "/".
3e262b95 915 * - it ends with ".lock"
a4c2e699 916 * - it contains a "\" (backslash)
03feddd6
JH
917 */
918
9224b73b 919/* Return true iff ch is not allowed in reference names. */
03feddd6
JH
920static inline int bad_ref_char(int ch)
921{
f3738c1c 922 if (((unsigned) ch) <= ' ' || ch == 0x7f ||
a4c2e699 923 ch == '~' || ch == '^' || ch == ':' || ch == '\\')
8558fd9e
DB
924 return 1;
925 /* 2.13 Pattern Matching Notation */
9224b73b 926 if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */
8558fd9e 927 return 1;
8558fd9e 928 return 0;
03feddd6
JH
929}
930
49295d4e 931/*
dfefa935 932 * Try to read one refname component from the front of refname. Return
49295d4e
MH
933 * the length of the component found, or -1 if the component is not
934 * legal.
935 */
dfefa935 936static int check_refname_component(const char *refname, int flags)
95fc7512 937{
49295d4e
MH
938 const char *cp;
939 char last = '\0';
03feddd6 940
dfefa935 941 for (cp = refname; ; cp++) {
49295d4e
MH
942 char ch = *cp;
943 if (ch == '\0' || ch == '/')
944 break;
945 if (bad_ref_char(ch))
946 return -1; /* Illegal character in refname. */
947 if (last == '.' && ch == '.')
948 return -1; /* Refname contains "..". */
949 if (last == '@' && ch == '{')
950 return -1; /* Refname contains "@{". */
cbdffe40 951 last = ch;
49295d4e 952 }
dfefa935 953 if (cp == refname)
49295d4e 954 return -1; /* Component has zero length. */
dfefa935 955 if (refname[0] == '.') {
dce4bab6
MH
956 if (!(flags & REFNAME_DOT_COMPONENT))
957 return -1; /* Component starts with '.'. */
958 /*
959 * Even if leading dots are allowed, don't allow "."
960 * as a component (".." is prevented by a rule above).
961 */
dfefa935 962 if (refname[1] == '\0')
dce4bab6
MH
963 return -1; /* Component equals ".". */
964 }
dfefa935 965 if (cp - refname >= 5 && !memcmp(cp - 5, ".lock", 5))
7e9d2fe9 966 return -1; /* Refname ends with ".lock". */
dfefa935 967 return cp - refname;
49295d4e
MH
968}
969
dfefa935 970int check_refname_format(const char *refname, int flags)
95fc7512 971{
49295d4e 972 int component_len, component_count = 0;
03feddd6 973
03feddd6 974 while (1) {
49295d4e 975 /* We are at the start of a path component. */
dfefa935 976 component_len = check_refname_component(refname, flags);
49295d4e
MH
977 if (component_len < 0) {
978 if ((flags & REFNAME_REFSPEC_PATTERN) &&
dfefa935
MH
979 refname[0] == '*' &&
980 (refname[1] == '\0' || refname[1] == '/')) {
8d9c5010
MH
981 /* Accept one wildcard as a full refname component. */
982 flags &= ~REFNAME_REFSPEC_PATTERN;
49295d4e
MH
983 component_len = 1;
984 } else {
8d9c5010 985 return -1;
49295d4e 986 }
03feddd6 987 }
49295d4e 988 component_count++;
dfefa935 989 if (refname[component_len] == '\0')
49295d4e
MH
990 break;
991 /* Skip to next component. */
dfefa935 992 refname += component_len + 1;
03feddd6 993 }
49295d4e 994
dfefa935 995 if (refname[component_len - 1] == '.')
49295d4e 996 return -1; /* Refname ends with '.'. */
49295d4e
MH
997 if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2)
998 return -1; /* Refname has only one component. */
999 return 0;
95fc7512
DB
1000}
1001
4577e483 1002const char *prettify_refname(const char *name)
a9c37a72 1003{
a9c37a72
DB
1004 return name + (
1005 !prefixcmp(name, "refs/heads/") ? 11 :
1006 !prefixcmp(name, "refs/tags/") ? 10 :
1007 !prefixcmp(name, "refs/remotes/") ? 13 :
1008 0);
1009}
1010
79803322
SP
1011const char *ref_rev_parse_rules[] = {
1012 "%.*s",
1013 "refs/%.*s",
1014 "refs/tags/%.*s",
1015 "refs/heads/%.*s",
1016 "refs/remotes/%.*s",
1017 "refs/remotes/%.*s/HEAD",
1018 NULL
1019};
1020
1021int refname_match(const char *abbrev_name, const char *full_name, const char **rules)
1022{
1023 const char **p;
1024 const int abbrev_name_len = strlen(abbrev_name);
1025
1026 for (p = rules; *p; p++) {
1027 if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
1028 return 1;
1029 }
1030 }
1031
1032 return 0;
1033}
1034
e5f38ec3 1035static struct ref_lock *verify_lock(struct ref_lock *lock,
4bd18c43
SP
1036 const unsigned char *old_sha1, int mustexist)
1037{
c6893323 1038 if (read_ref_full(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
434cd0cd 1039 error("Can't verify ref %s", lock->ref_name);
4bd18c43
SP
1040 unlock_ref(lock);
1041 return NULL;
1042 }
a89fccd2 1043 if (hashcmp(lock->old_sha1, old_sha1)) {
434cd0cd 1044 error("Ref %s is at %s but expected %s", lock->ref_name,
4bd18c43
SP
1045 sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
1046 unlock_ref(lock);
1047 return NULL;
1048 }
1049 return lock;
1050}
1051
7155b727 1052static int remove_empty_directories(const char *file)
bc7127ef
JH
1053{
1054 /* we want to create a file but there is a directory there;
1055 * if that is an empty directory (or a directory that contains
1056 * only empty directories), remove them.
1057 */
7155b727
JS
1058 struct strbuf path;
1059 int result;
bc7127ef 1060
7155b727
JS
1061 strbuf_init(&path, 20);
1062 strbuf_addstr(&path, file);
1063
a0f4afbe 1064 result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY);
7155b727
JS
1065
1066 strbuf_release(&path);
1067
1068 return result;
bc7127ef
JH
1069}
1070
19b68b1e
MH
1071/*
1072 * Return true iff a reference named refname could be created without
1073 * conflicting with the name of an existing reference. If oldrefname
1074 * is non-NULL, ignore potential conflicts with oldrefname (e.g.,
1075 * because oldrefname is scheduled for deletion in the same
1076 * operation).
1077 */
dfefa935 1078static int is_refname_available(const char *refname, const char *oldrefname,
19b68b1e 1079 struct ref_array *array)
c976d415 1080{
dfefa935 1081 int i, namlen = strlen(refname); /* e.g. 'foo/bar' */
e9c4c111
JP
1082 for (i = 0; i < array->nr; i++ ) {
1083 struct ref_entry *entry = array->refs[i];
1084 /* entry->name could be 'foo' or 'foo/bar/baz' */
dfefa935 1085 if (!oldrefname || strcmp(oldrefname, entry->name)) {
e9c4c111 1086 int len = strlen(entry->name);
c976d415 1087 int cmplen = (namlen < len) ? namlen : len;
dfefa935
MH
1088 const char *lead = (namlen < len) ? entry->name : refname;
1089 if (!strncmp(refname, entry->name, cmplen) &&
c976d415 1090 lead[cmplen] == '/') {
19b68b1e
MH
1091 error("'%s' exists; cannot create '%s'",
1092 entry->name, refname);
c976d415
LH
1093 return 0;
1094 }
1095 }
c976d415
LH
1096 }
1097 return 1;
1098}
1099
ff74f7f1
JH
1100/*
1101 * *string and *len will only be substituted, and *string returned (for
1102 * later free()ing) if the string passed in is a magic short-hand form
1103 * to name a branch.
1104 */
1105static char *substitute_branch_name(const char **string, int *len)
1106{
1107 struct strbuf buf = STRBUF_INIT;
1108 int ret = interpret_branch_name(*string, &buf);
1109
1110 if (ret == *len) {
1111 size_t size;
1112 *string = strbuf_detach(&buf, &size);
1113 *len = size;
1114 return (char *)*string;
1115 }
1116
1117 return NULL;
1118}
1119
1120int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
1121{
1122 char *last_branch = substitute_branch_name(&str, &len);
1123 const char **p, *r;
1124 int refs_found = 0;
1125
1126 *ref = NULL;
1127 for (p = ref_rev_parse_rules; *p; p++) {
1128 char fullref[PATH_MAX];
1129 unsigned char sha1_from_ref[20];
1130 unsigned char *this_result;
1131 int flag;
1132
1133 this_result = refs_found ? sha1_from_ref : sha1;
1134 mksnpath(fullref, sizeof(fullref), *p, len, str);
8cad4744 1135 r = resolve_ref_unsafe(fullref, this_result, 1, &flag);
ff74f7f1
JH
1136 if (r) {
1137 if (!refs_found++)
1138 *ref = xstrdup(r);
1139 if (!warn_ambiguous_refs)
1140 break;
55956350 1141 } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) {
ff74f7f1 1142 warning("ignoring dangling symref %s.", fullref);
55956350
JH
1143 } else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) {
1144 warning("ignoring broken ref %s.", fullref);
1145 }
ff74f7f1
JH
1146 }
1147 free(last_branch);
1148 return refs_found;
1149}
1150
1151int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
1152{
1153 char *last_branch = substitute_branch_name(&str, &len);
1154 const char **p;
1155 int logs_found = 0;
1156
1157 *log = NULL;
1158 for (p = ref_rev_parse_rules; *p; p++) {
1159 struct stat st;
1160 unsigned char hash[20];
1161 char path[PATH_MAX];
1162 const char *ref, *it;
1163
1164 mksnpath(path, sizeof(path), *p, len, str);
8cad4744 1165 ref = resolve_ref_unsafe(path, hash, 1, NULL);
ff74f7f1
JH
1166 if (!ref)
1167 continue;
1168 if (!stat(git_path("logs/%s", path), &st) &&
1169 S_ISREG(st.st_mode))
1170 it = path;
1171 else if (strcmp(ref, path) &&
1172 !stat(git_path("logs/%s", ref), &st) &&
1173 S_ISREG(st.st_mode))
1174 it = ref;
1175 else
1176 continue;
1177 if (!logs_found++) {
1178 *log = xstrdup(it);
1179 hashcpy(sha1, hash);
1180 }
1181 if (!warn_ambiguous_refs)
1182 break;
1183 }
1184 free(last_branch);
1185 return logs_found;
1186}
1187
dfefa935
MH
1188static struct ref_lock *lock_ref_sha1_basic(const char *refname,
1189 const unsigned char *old_sha1,
1190 int flags, int *type_p)
4bd18c43 1191{
434cd0cd 1192 char *ref_file;
dfefa935 1193 const char *orig_refname = refname;
4bd18c43 1194 struct ref_lock *lock;
5cc3cef9 1195 int last_errno = 0;
acd3b9ec 1196 int type, lflags;
4431fcc4 1197 int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
5bdd8d4a 1198 int missing = 0;
4bd18c43
SP
1199
1200 lock = xcalloc(1, sizeof(struct ref_lock));
1201 lock->lock_fd = -1;
1202
8d68493f 1203 refname = resolve_ref_unsafe(refname, lock->old_sha1, mustexist, &type);
dfefa935 1204 if (!refname && errno == EISDIR) {
bc7127ef
JH
1205 /* we are trying to lock foo but we used to
1206 * have foo/bar which now does not exist;
1207 * it is normal for the empty directory 'foo'
1208 * to remain.
1209 */
dfefa935 1210 ref_file = git_path("%s", orig_refname);
5cc3cef9
JH
1211 if (remove_empty_directories(ref_file)) {
1212 last_errno = errno;
dfefa935 1213 error("there are still refs under '%s'", orig_refname);
5cc3cef9
JH
1214 goto error_return;
1215 }
8d68493f 1216 refname = resolve_ref_unsafe(orig_refname, lock->old_sha1, mustexist, &type);
bc7127ef 1217 }
68db31cc
SV
1218 if (type_p)
1219 *type_p = type;
dfefa935 1220 if (!refname) {
5cc3cef9 1221 last_errno = errno;
818f477c 1222 error("unable to resolve reference %s: %s",
dfefa935 1223 orig_refname, strerror(errno));
5cc3cef9 1224 goto error_return;
4bd18c43 1225 }
5bdd8d4a 1226 missing = is_null_sha1(lock->old_sha1);
c976d415
LH
1227 /* When the ref did not exist and we are creating it,
1228 * make sure there is no existing ref that is packed
1229 * whose name begins with our refname, nor a ref whose
1230 * name is a proper prefix of our refname.
1231 */
5bdd8d4a 1232 if (missing &&
316b097a 1233 !is_refname_available(refname, NULL, get_packed_refs(get_ref_cache(NULL)))) {
f475e08e 1234 last_errno = ENOTDIR;
c976d415 1235 goto error_return;
f475e08e 1236 }
22a3844e 1237
c33d5174 1238 lock->lk = xcalloc(1, sizeof(struct lock_file));
4bd18c43 1239
acd3b9ec
JH
1240 lflags = LOCK_DIE_ON_ERROR;
1241 if (flags & REF_NODEREF) {
dfefa935 1242 refname = orig_refname;
acd3b9ec
JH
1243 lflags |= LOCK_NODEREF;
1244 }
dfefa935
MH
1245 lock->ref_name = xstrdup(refname);
1246 lock->orig_ref_name = xstrdup(orig_refname);
1247 ref_file = git_path("%s", refname);
5bdd8d4a 1248 if (missing)
68db31cc
SV
1249 lock->force_write = 1;
1250 if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
1251 lock->force_write = 1;
4bd18c43 1252
5cc3cef9
JH
1253 if (safe_create_leading_directories(ref_file)) {
1254 last_errno = errno;
1255 error("unable to create directory for %s", ref_file);
1256 goto error_return;
1257 }
4bd18c43 1258
acd3b9ec 1259 lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags);
4bd18c43 1260 return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
5cc3cef9
JH
1261
1262 error_return:
1263 unlock_ref(lock);
1264 errno = last_errno;
1265 return NULL;
4bd18c43
SP
1266}
1267
dfefa935 1268struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha1)
95fc7512 1269{
53cce84c 1270 char refpath[PATH_MAX];
dfefa935 1271 if (check_refname_format(refname, 0))
4bd18c43 1272 return NULL;
dfefa935 1273 strcpy(refpath, mkpath("refs/%s", refname));
68db31cc 1274 return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
4bd18c43
SP
1275}
1276
dfefa935
MH
1277struct ref_lock *lock_any_ref_for_update(const char *refname,
1278 const unsigned char *old_sha1, int flags)
4bd18c43 1279{
dfefa935 1280 if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
257f3020 1281 return NULL;
dfefa935 1282 return lock_ref_sha1_basic(refname, old_sha1, flags, NULL);
c0277d15
JH
1283}
1284
26a063a1
JH
1285static struct lock_file packlock;
1286
c0277d15
JH
1287static int repack_without_ref(const char *refname)
1288{
e9c4c111 1289 struct ref_array *packed;
e9c4c111 1290 int fd, i;
c0277d15 1291
316b097a 1292 packed = get_packed_refs(get_ref_cache(NULL));
fe9c7b78 1293 if (search_ref_array(packed, refname) == NULL)
c0277d15 1294 return 0;
c0277d15 1295 fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
1b018fd9
MV
1296 if (fd < 0) {
1297 unable_to_lock_error(git_path("packed-refs"), errno);
c0277d15 1298 return error("cannot delete '%s' from packed refs", refname);
1b018fd9 1299 }
c0277d15 1300
e9c4c111 1301 for (i = 0; i < packed->nr; i++) {
c0277d15
JH
1302 char line[PATH_MAX + 100];
1303 int len;
fe9c7b78 1304 struct ref_entry *ref = packed->refs[i];
e9c4c111
JP
1305
1306 if (!strcmp(refname, ref->name))
c0277d15
JH
1307 continue;
1308 len = snprintf(line, sizeof(line), "%s %s\n",
e9c4c111 1309 sha1_to_hex(ref->sha1), ref->name);
c0277d15
JH
1310 /* this should not happen but just being defensive */
1311 if (len > sizeof(line))
e9c4c111 1312 die("too long a refname '%s'", ref->name);
c0277d15
JH
1313 write_or_die(fd, line, len);
1314 }
1315 return commit_lock_file(&packlock);
1316}
1317
eca35a25 1318int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
c0277d15
JH
1319{
1320 struct ref_lock *lock;
eca35a25 1321 int err, i = 0, ret = 0, flag = 0;
c0277d15 1322
68db31cc 1323 lock = lock_ref_sha1_basic(refname, sha1, 0, &flag);
c0277d15
JH
1324 if (!lock)
1325 return 1;
045a476f 1326 if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
c0277d15 1327 /* loose */
eca35a25
MV
1328 const char *path;
1329
1330 if (!(delopt & REF_NODEREF)) {
1331 i = strlen(lock->lk->filename) - 5; /* .lock */
1332 lock->lk->filename[i] = 0;
1333 path = lock->lk->filename;
1334 } else {
9db56f71 1335 path = git_path("%s", refname);
eca35a25 1336 }
691f1a28
AR
1337 err = unlink_or_warn(path);
1338 if (err && errno != ENOENT)
c0277d15 1339 ret = 1;
691f1a28 1340
eca35a25
MV
1341 if (!(delopt & REF_NODEREF))
1342 lock->lk->filename[i] = '.';
c0277d15
JH
1343 }
1344 /* removing the loose one could have resurrected an earlier
1345 * packed one. Also, if it was not loose we need to repack
1346 * without it.
1347 */
1348 ret |= repack_without_ref(refname);
1349
691f1a28 1350 unlink_or_warn(git_path("logs/%s", lock->ref_name));
3870a0d1 1351 invalidate_ref_cache(NULL);
c0277d15
JH
1352 unlock_ref(lock);
1353 return ret;
4bd18c43
SP
1354}
1355
765c2258
PH
1356/*
1357 * People using contrib's git-new-workdir have .git/logs/refs ->
1358 * /some/other/path/.git/logs/refs, and that may live on another device.
1359 *
1360 * IOW, to avoid cross device rename errors, the temporary renamed log must
1361 * live into logs/refs.
1362 */
1363#define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1364
dfefa935 1365int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg)
c976d415 1366{
c976d415
LH
1367 unsigned char sha1[20], orig_sha1[20];
1368 int flag = 0, logmoved = 0;
1369 struct ref_lock *lock;
c976d415 1370 struct stat loginfo;
dfefa935 1371 int log = !lstat(git_path("logs/%s", oldrefname), &loginfo);
eca35a25 1372 const char *symref = NULL;
316b097a 1373 struct ref_cache *refs = get_ref_cache(NULL);
c976d415 1374
450d4c0f 1375 if (log && S_ISLNK(loginfo.st_mode))
dfefa935 1376 return error("reflog for %s is a symlink", oldrefname);
c976d415 1377
8d68493f 1378 symref = resolve_ref_unsafe(oldrefname, orig_sha1, 1, &flag);
eca35a25 1379 if (flag & REF_ISSYMREF)
fa58186c 1380 return error("refname %s is a symbolic ref, renaming it is not supported",
dfefa935 1381 oldrefname);
eca35a25 1382 if (!symref)
dfefa935 1383 return error("refname %s not found", oldrefname);
c976d415 1384
316b097a 1385 if (!is_refname_available(newrefname, oldrefname, get_packed_refs(refs)))
c976d415
LH
1386 return 1;
1387
316b097a 1388 if (!is_refname_available(newrefname, oldrefname, get_loose_refs(refs)))
c976d415
LH
1389 return 1;
1390
dfefa935 1391 if (log && rename(git_path("logs/%s", oldrefname), git_path(TMP_RENAMED_LOG)))
765c2258 1392 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
dfefa935 1393 oldrefname, strerror(errno));
c976d415 1394
dfefa935
MH
1395 if (delete_ref(oldrefname, orig_sha1, REF_NODEREF)) {
1396 error("unable to delete old %s", oldrefname);
c976d415
LH
1397 goto rollback;
1398 }
1399
dfefa935
MH
1400 if (!read_ref_full(newrefname, sha1, 1, &flag) &&
1401 delete_ref(newrefname, sha1, REF_NODEREF)) {
c976d415 1402 if (errno==EISDIR) {
dfefa935
MH
1403 if (remove_empty_directories(git_path("%s", newrefname))) {
1404 error("Directory not empty: %s", newrefname);
c976d415
LH
1405 goto rollback;
1406 }
1407 } else {
dfefa935 1408 error("unable to delete existing %s", newrefname);
c976d415
LH
1409 goto rollback;
1410 }
1411 }
1412
dfefa935
MH
1413 if (log && safe_create_leading_directories(git_path("logs/%s", newrefname))) {
1414 error("unable to create directory for %s", newrefname);
c976d415
LH
1415 goto rollback;
1416 }
1417
1418 retry:
dfefa935 1419 if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname))) {
d9e74d57
JR
1420 if (errno==EISDIR || errno==ENOTDIR) {
1421 /*
1422 * rename(a, b) when b is an existing
1423 * directory ought to result in ISDIR, but
1424 * Solaris 5.8 gives ENOTDIR. Sheesh.
1425 */
dfefa935
MH
1426 if (remove_empty_directories(git_path("logs/%s", newrefname))) {
1427 error("Directory not empty: logs/%s", newrefname);
c976d415
LH
1428 goto rollback;
1429 }
1430 goto retry;
1431 } else {
765c2258 1432 error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
dfefa935 1433 newrefname, strerror(errno));
c976d415
LH
1434 goto rollback;
1435 }
1436 }
1437 logmoved = log;
1438
dfefa935 1439 lock = lock_ref_sha1_basic(newrefname, NULL, 0, NULL);
c976d415 1440 if (!lock) {
dfefa935 1441 error("unable to lock %s for update", newrefname);
c976d415
LH
1442 goto rollback;
1443 }
c976d415
LH
1444 lock->force_write = 1;
1445 hashcpy(lock->old_sha1, orig_sha1);
678d0f4c 1446 if (write_ref_sha1(lock, orig_sha1, logmsg)) {
dfefa935 1447 error("unable to write current sha1 into %s", newrefname);
c976d415
LH
1448 goto rollback;
1449 }
1450
1451 return 0;
1452
1453 rollback:
dfefa935 1454 lock = lock_ref_sha1_basic(oldrefname, NULL, 0, NULL);
c976d415 1455 if (!lock) {
dfefa935 1456 error("unable to lock %s for rollback", oldrefname);
c976d415
LH
1457 goto rollbacklog;
1458 }
1459
1460 lock->force_write = 1;
1461 flag = log_all_ref_updates;
1462 log_all_ref_updates = 0;
1463 if (write_ref_sha1(lock, orig_sha1, NULL))
dfefa935 1464 error("unable to write current sha1 into %s", oldrefname);
c976d415
LH
1465 log_all_ref_updates = flag;
1466
1467 rollbacklog:
dfefa935 1468 if (logmoved && rename(git_path("logs/%s", newrefname), git_path("logs/%s", oldrefname)))
c976d415 1469 error("unable to restore logfile %s from %s: %s",
dfefa935 1470 oldrefname, newrefname, strerror(errno));
c976d415 1471 if (!logmoved && log &&
dfefa935 1472 rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldrefname)))
765c2258 1473 error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s",
dfefa935 1474 oldrefname, strerror(errno));
c976d415
LH
1475
1476 return 1;
1477}
1478
435fc852 1479int close_ref(struct ref_lock *lock)
b531394d
BC
1480{
1481 if (close_lock_file(lock->lk))
1482 return -1;
1483 lock->lock_fd = -1;
1484 return 0;
1485}
1486
435fc852 1487int commit_ref(struct ref_lock *lock)
b531394d
BC
1488{
1489 if (commit_lock_file(lock->lk))
1490 return -1;
1491 lock->lock_fd = -1;
1492 return 0;
1493}
1494
e5f38ec3 1495void unlock_ref(struct ref_lock *lock)
4bd18c43 1496{
4ed7cd3a
BC
1497 /* Do not free lock->lk -- atexit() still looks at them */
1498 if (lock->lk)
1499 rollback_lock_file(lock->lk);
434cd0cd 1500 free(lock->ref_name);
1655707c 1501 free(lock->orig_ref_name);
4bd18c43
SP
1502 free(lock);
1503}
1504
0ec29a47
JH
1505/*
1506 * copy the reflog message msg to buf, which has been allocated sufficiently
1507 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1508 * because reflog file is one line per entry.
1509 */
1510static int copy_msg(char *buf, const char *msg)
1511{
1512 char *cp = buf;
1513 char c;
1514 int wasspace = 1;
1515
1516 *cp++ = '\t';
1517 while ((c = *msg++)) {
1518 if (wasspace && isspace(c))
1519 continue;
1520 wasspace = isspace(c);
1521 if (wasspace)
1522 c = ' ';
1523 *cp++ = c;
1524 }
1525 while (buf < cp && isspace(cp[-1]))
1526 cp--;
1527 *cp++ = '\n';
1528 return cp - buf;
1529}
1530
dfefa935 1531int log_ref_setup(const char *refname, char *logfile, int bufsize)
6de08ae6 1532{
859c3017 1533 int logfd, oflags = O_APPEND | O_WRONLY;
9a13f0b7 1534
dfefa935 1535 git_snpath(logfile, bufsize, "logs/%s", refname);
4057deb5 1536 if (log_all_ref_updates &&
dfefa935
MH
1537 (!prefixcmp(refname, "refs/heads/") ||
1538 !prefixcmp(refname, "refs/remotes/") ||
1539 !prefixcmp(refname, "refs/notes/") ||
1540 !strcmp(refname, "HEAD"))) {
157aaea5 1541 if (safe_create_leading_directories(logfile) < 0)
6de08ae6 1542 return error("unable to create directory for %s",
157aaea5 1543 logfile);
6de08ae6
SP
1544 oflags |= O_CREAT;
1545 }
1546
157aaea5 1547 logfd = open(logfile, oflags, 0666);
6de08ae6 1548 if (logfd < 0) {
1974bf62 1549 if (!(oflags & O_CREAT) && errno == ENOENT)
6de08ae6 1550 return 0;
3b463c3f
JH
1551
1552 if ((oflags & O_CREAT) && errno == EISDIR) {
157aaea5 1553 if (remove_empty_directories(logfile)) {
3b463c3f 1554 return error("There are still logs under '%s'",
157aaea5 1555 logfile);
3b463c3f 1556 }
157aaea5 1557 logfd = open(logfile, oflags, 0666);
3b463c3f
JH
1558 }
1559
1560 if (logfd < 0)
1561 return error("Unable to append to %s: %s",
157aaea5 1562 logfile, strerror(errno));
6de08ae6
SP
1563 }
1564
157aaea5 1565 adjust_shared_perm(logfile);
859c3017
EM
1566 close(logfd);
1567 return 0;
1568}
443b92b6 1569
dfefa935 1570static int log_ref_write(const char *refname, const unsigned char *old_sha1,
859c3017
EM
1571 const unsigned char *new_sha1, const char *msg)
1572{
1573 int logfd, result, written, oflags = O_APPEND | O_WRONLY;
1574 unsigned maxlen, len;
1575 int msglen;
157aaea5 1576 char log_file[PATH_MAX];
859c3017
EM
1577 char *logrec;
1578 const char *committer;
1579
1580 if (log_all_ref_updates < 0)
1581 log_all_ref_updates = !is_bare_repository();
1582
dfefa935 1583 result = log_ref_setup(refname, log_file, sizeof(log_file));
859c3017
EM
1584 if (result)
1585 return result;
1586
1587 logfd = open(log_file, oflags);
1588 if (logfd < 0)
1589 return 0;
0ec29a47 1590 msglen = msg ? strlen(msg) : 0;
774751a8 1591 committer = git_committer_info(0);
8ac65937
JH
1592 maxlen = strlen(committer) + msglen + 100;
1593 logrec = xmalloc(maxlen);
1594 len = sprintf(logrec, "%s %s %s\n",
9a13f0b7
NP
1595 sha1_to_hex(old_sha1),
1596 sha1_to_hex(new_sha1),
8ac65937
JH
1597 committer);
1598 if (msglen)
0ec29a47 1599 len += copy_msg(logrec + len - 1, msg) - 1;
93822c22 1600 written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
6de08ae6 1601 free(logrec);
91c8d590 1602 if (close(logfd) != 0 || written != len)
9a13f0b7 1603 return error("Unable to append to %s", log_file);
6de08ae6
SP
1604 return 0;
1605}
1606
c3b0dec5
LT
1607static int is_branch(const char *refname)
1608{
1609 return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
1610}
1611
4bd18c43
SP
1612int write_ref_sha1(struct ref_lock *lock,
1613 const unsigned char *sha1, const char *logmsg)
1614{
1615 static char term = '\n';
c3b0dec5 1616 struct object *o;
4bd18c43
SP
1617
1618 if (!lock)
95fc7512 1619 return -1;
a89fccd2 1620 if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
4bd18c43
SP
1621 unlock_ref(lock);
1622 return 0;
95fc7512 1623 }
c3b0dec5
LT
1624 o = parse_object(sha1);
1625 if (!o) {
7be8b3ba 1626 error("Trying to write ref %s with nonexistent object %s",
c3b0dec5
LT
1627 lock->ref_name, sha1_to_hex(sha1));
1628 unlock_ref(lock);
1629 return -1;
1630 }
1631 if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
1632 error("Trying to write non-commit object %s to branch %s",
1633 sha1_to_hex(sha1), lock->ref_name);
1634 unlock_ref(lock);
1635 return -1;
1636 }
93822c22
AW
1637 if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
1638 write_in_full(lock->lock_fd, &term, 1) != 1
b531394d 1639 || close_ref(lock) < 0) {
c33d5174 1640 error("Couldn't write %s", lock->lk->filename);
4bd18c43
SP
1641 unlock_ref(lock);
1642 return -1;
1643 }
8bf90dc9 1644 clear_loose_ref_cache(get_ref_cache(NULL));
bd104db1
NP
1645 if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
1646 (strcmp(lock->ref_name, lock->orig_ref_name) &&
1647 log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
6de08ae6
SP
1648 unlock_ref(lock);
1649 return -1;
1650 }
605fac8b
NP
1651 if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
1652 /*
1653 * Special hack: If a branch is updated directly and HEAD
1654 * points to it (may happen on the remote side of a push
1655 * for example) then logically the HEAD reflog should be
1656 * updated too.
1657 * A generic solution implies reverse symref information,
1658 * but finding all symrefs pointing to the given branch
1659 * would be rather costly for this rare event (the direct
1660 * update of a branch) to be worth it. So let's cheat and
1661 * check with HEAD only which should cover 99% of all usage
1662 * scenarios (even 100% of the default ones).
1663 */
1664 unsigned char head_sha1[20];
1665 int head_flag;
1666 const char *head_ref;
8cad4744 1667 head_ref = resolve_ref_unsafe("HEAD", head_sha1, 1, &head_flag);
605fac8b
NP
1668 if (head_ref && (head_flag & REF_ISSYMREF) &&
1669 !strcmp(head_ref, lock->ref_name))
1670 log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
1671 }
b531394d 1672 if (commit_ref(lock)) {
434cd0cd 1673 error("Couldn't set %s", lock->ref_name);
4bd18c43
SP
1674 unlock_ref(lock);
1675 return -1;
1676 }
4bd18c43
SP
1677 unlock_ref(lock);
1678 return 0;
95fc7512 1679}
d556fae2 1680
8b5157e4
NP
1681int create_symref(const char *ref_target, const char *refs_heads_master,
1682 const char *logmsg)
41b625b0
NP
1683{
1684 const char *lockpath;
1685 char ref[1000];
1686 int fd, len, written;
a4f34cbb 1687 char *git_HEAD = git_pathdup("%s", ref_target);
8b5157e4
NP
1688 unsigned char old_sha1[20], new_sha1[20];
1689
1690 if (logmsg && read_ref(ref_target, old_sha1))
1691 hashclr(old_sha1);
41b625b0 1692
d48744d1
JH
1693 if (safe_create_leading_directories(git_HEAD) < 0)
1694 return error("unable to create directory for %s", git_HEAD);
1695
41b625b0
NP
1696#ifndef NO_SYMLINK_HEAD
1697 if (prefer_symlink_refs) {
1698 unlink(git_HEAD);
1699 if (!symlink(refs_heads_master, git_HEAD))
8b5157e4 1700 goto done;
41b625b0
NP
1701 fprintf(stderr, "no symlink - falling back to symbolic ref\n");
1702 }
1703#endif
1704
1705 len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
1706 if (sizeof(ref) <= len) {
1707 error("refname too long: %s", refs_heads_master);
47fc52e2 1708 goto error_free_return;
41b625b0
NP
1709 }
1710 lockpath = mkpath("%s.lock", git_HEAD);
1711 fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
1712 if (fd < 0) {
1713 error("Unable to open %s for writing", lockpath);
47fc52e2 1714 goto error_free_return;
41b625b0
NP
1715 }
1716 written = write_in_full(fd, ref, len);
91c8d590 1717 if (close(fd) != 0 || written != len) {
41b625b0 1718 error("Unable to write to %s", lockpath);
47fc52e2 1719 goto error_unlink_return;
41b625b0
NP
1720 }
1721 if (rename(lockpath, git_HEAD) < 0) {
41b625b0 1722 error("Unable to create %s", git_HEAD);
47fc52e2 1723 goto error_unlink_return;
41b625b0
NP
1724 }
1725 if (adjust_shared_perm(git_HEAD)) {
41b625b0 1726 error("Unable to fix permissions on %s", lockpath);
47fc52e2 1727 error_unlink_return:
691f1a28 1728 unlink_or_warn(lockpath);
47fc52e2
JH
1729 error_free_return:
1730 free(git_HEAD);
1731 return -1;
41b625b0 1732 }
8b5157e4 1733
ee96d11b 1734#ifndef NO_SYMLINK_HEAD
8b5157e4 1735 done:
ee96d11b 1736#endif
8b5157e4
NP
1737 if (logmsg && !read_ref(refs_heads_master, new_sha1))
1738 log_ref_write(ref_target, old_sha1, new_sha1, logmsg);
1739
47fc52e2 1740 free(git_HEAD);
41b625b0
NP
1741 return 0;
1742}
1743
16d7cc90
JH
1744static char *ref_msg(const char *line, const char *endp)
1745{
1746 const char *ep;
16d7cc90 1747 line += 82;
182af834
PH
1748 ep = memchr(line, '\n', endp - line);
1749 if (!ep)
1750 ep = endp;
1751 return xmemdupz(line, ep - line);
16d7cc90
JH
1752}
1753
dfefa935
MH
1754int read_ref_at(const char *refname, unsigned long at_time, int cnt,
1755 unsigned char *sha1, char **msg,
1756 unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
d556fae2 1757{
e5229042 1758 const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
d556fae2 1759 char *tz_c;
e29cb53a 1760 int logfd, tz, reccnt = 0;
d556fae2
SP
1761 struct stat st;
1762 unsigned long date;
e5229042 1763 unsigned char logged_sha1[20];
cb48cb58 1764 void *log_mapped;
dc49cd76 1765 size_t mapsz;
d556fae2 1766
dfefa935 1767 logfile = git_path("logs/%s", refname);
d556fae2
SP
1768 logfd = open(logfile, O_RDONLY, 0);
1769 if (logfd < 0)
d824cbba 1770 die_errno("Unable to read log '%s'", logfile);
d556fae2
SP
1771 fstat(logfd, &st);
1772 if (!st.st_size)
1773 die("Log %s is empty.", logfile);
dc49cd76
SP
1774 mapsz = xsize_t(st.st_size);
1775 log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0);
cb48cb58 1776 logdata = log_mapped;
d556fae2
SP
1777 close(logfd);
1778
e5229042 1779 lastrec = NULL;
d556fae2
SP
1780 rec = logend = logdata + st.st_size;
1781 while (logdata < rec) {
e29cb53a 1782 reccnt++;
d556fae2
SP
1783 if (logdata < rec && *(rec-1) == '\n')
1784 rec--;
e5229042
SP
1785 lastgt = NULL;
1786 while (logdata < rec && *(rec-1) != '\n') {
d556fae2 1787 rec--;
e5229042
SP
1788 if (*rec == '>')
1789 lastgt = rec;
1790 }
1791 if (!lastgt)
d556fae2 1792 die("Log %s is corrupt.", logfile);
e5229042 1793 date = strtoul(lastgt + 1, &tz_c, 10);
ab2a1a32 1794 if (date <= at_time || cnt == 0) {
76a44c5c 1795 tz = strtoul(tz_c, NULL, 10);
16d7cc90
JH
1796 if (msg)
1797 *msg = ref_msg(rec, logend);
1798 if (cutoff_time)
1799 *cutoff_time = date;
1800 if (cutoff_tz)
1801 *cutoff_tz = tz;
1802 if (cutoff_cnt)
76a44c5c 1803 *cutoff_cnt = reccnt - 1;
e5229042
SP
1804 if (lastrec) {
1805 if (get_sha1_hex(lastrec, logged_sha1))
1806 die("Log %s is corrupt.", logfile);
1807 if (get_sha1_hex(rec + 41, sha1))
1808 die("Log %s is corrupt.", logfile);
a89fccd2 1809 if (hashcmp(logged_sha1, sha1)) {
edbc25c5 1810 warning("Log %s has gap after %s.",
73013afd 1811 logfile, show_date(date, tz, DATE_RFC2822));
e5229042 1812 }
e5f38ec3
JH
1813 }
1814 else if (date == at_time) {
e5229042
SP
1815 if (get_sha1_hex(rec + 41, sha1))
1816 die("Log %s is corrupt.", logfile);
e5f38ec3
JH
1817 }
1818 else {
e5229042
SP
1819 if (get_sha1_hex(rec + 41, logged_sha1))
1820 die("Log %s is corrupt.", logfile);
a89fccd2 1821 if (hashcmp(logged_sha1, sha1)) {
edbc25c5 1822 warning("Log %s unexpectedly ended on %s.",
73013afd 1823 logfile, show_date(date, tz, DATE_RFC2822));
e5229042
SP
1824 }
1825 }
dc49cd76 1826 munmap(log_mapped, mapsz);
d556fae2
SP
1827 return 0;
1828 }
e5229042 1829 lastrec = rec;
ab2a1a32
JH
1830 if (cnt > 0)
1831 cnt--;
d556fae2
SP
1832 }
1833
e5229042
SP
1834 rec = logdata;
1835 while (rec < logend && *rec != '>' && *rec != '\n')
1836 rec++;
1837 if (rec == logend || *rec == '\n')
d556fae2 1838 die("Log %s is corrupt.", logfile);
e5229042 1839 date = strtoul(rec + 1, &tz_c, 10);
d556fae2
SP
1840 tz = strtoul(tz_c, NULL, 10);
1841 if (get_sha1_hex(logdata, sha1))
1842 die("Log %s is corrupt.", logfile);
d1a4489a
JK
1843 if (is_null_sha1(sha1)) {
1844 if (get_sha1_hex(logdata + 41, sha1))
1845 die("Log %s is corrupt.", logfile);
1846 }
16d7cc90
JH
1847 if (msg)
1848 *msg = ref_msg(logdata, logend);
dc49cd76 1849 munmap(log_mapped, mapsz);
16d7cc90
JH
1850
1851 if (cutoff_time)
1852 *cutoff_time = date;
1853 if (cutoff_tz)
1854 *cutoff_tz = tz;
1855 if (cutoff_cnt)
1856 *cutoff_cnt = reccnt;
1857 return 1;
d556fae2 1858}
2ff81662 1859
dfefa935 1860int for_each_recent_reflog_ent(const char *refname, each_reflog_ent_fn fn, long ofs, void *cb_data)
2ff81662
JH
1861{
1862 const char *logfile;
1863 FILE *logfp;
8ca78803 1864 struct strbuf sb = STRBUF_INIT;
2266bf27 1865 int ret = 0;
2ff81662 1866
dfefa935 1867 logfile = git_path("logs/%s", refname);
2ff81662
JH
1868 logfp = fopen(logfile, "r");
1869 if (!logfp)
883d60fa 1870 return -1;
101d15e0
JH
1871
1872 if (ofs) {
1873 struct stat statbuf;
1874 if (fstat(fileno(logfp), &statbuf) ||
1875 statbuf.st_size < ofs ||
1876 fseek(logfp, -ofs, SEEK_END) ||
8ca78803 1877 strbuf_getwholeline(&sb, logfp, '\n')) {
9d33f7c2 1878 fclose(logfp);
8ca78803 1879 strbuf_release(&sb);
101d15e0 1880 return -1;
9d33f7c2 1881 }
101d15e0
JH
1882 }
1883
8ca78803 1884 while (!strbuf_getwholeline(&sb, logfp, '\n')) {
2ff81662 1885 unsigned char osha1[20], nsha1[20];
883d60fa
JS
1886 char *email_end, *message;
1887 unsigned long timestamp;
8ca78803 1888 int tz;
2ff81662
JH
1889
1890 /* old SP new SP name <email> SP time TAB msg LF */
8ca78803
RS
1891 if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' ||
1892 get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' ||
1893 get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' ||
1894 !(email_end = strchr(sb.buf + 82, '>')) ||
883d60fa
JS
1895 email_end[1] != ' ' ||
1896 !(timestamp = strtoul(email_end + 2, &message, 10)) ||
1897 !message || message[0] != ' ' ||
1898 (message[1] != '+' && message[1] != '-') ||
1899 !isdigit(message[2]) || !isdigit(message[3]) ||
b4dd4856 1900 !isdigit(message[4]) || !isdigit(message[5]))
2ff81662 1901 continue; /* corrupt? */
883d60fa
JS
1902 email_end[1] = '\0';
1903 tz = strtol(message + 1, NULL, 10);
b4dd4856
JS
1904 if (message[6] != '\t')
1905 message += 6;
1906 else
1907 message += 7;
8ca78803
RS
1908 ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message,
1909 cb_data);
883d60fa 1910 if (ret)
2266bf27 1911 break;
2ff81662
JH
1912 }
1913 fclose(logfp);
8ca78803 1914 strbuf_release(&sb);
2266bf27 1915 return ret;
2ff81662 1916}
e29cb53a 1917
dfefa935 1918int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data)
101d15e0 1919{
dfefa935 1920 return for_each_recent_reflog_ent(refname, fn, 0, cb_data);
101d15e0
JH
1921}
1922
eb8381c8
NP
1923static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data)
1924{
1925 DIR *dir = opendir(git_path("logs/%s", base));
fcee5a14 1926 int retval = 0;
eb8381c8
NP
1927
1928 if (dir) {
1929 struct dirent *de;
1930 int baselen = strlen(base);
1931 char *log = xmalloc(baselen + 257);
1932
1933 memcpy(log, base, baselen);
1934 if (baselen && base[baselen-1] != '/')
1935 log[baselen++] = '/';
1936
1937 while ((de = readdir(dir)) != NULL) {
1938 struct stat st;
1939 int namelen;
1940
1941 if (de->d_name[0] == '.')
1942 continue;
1943 namelen = strlen(de->d_name);
1944 if (namelen > 255)
1945 continue;
1946 if (has_extension(de->d_name, ".lock"))
1947 continue;
1948 memcpy(log + baselen, de->d_name, namelen+1);
1949 if (stat(git_path("logs/%s", log), &st) < 0)
1950 continue;
1951 if (S_ISDIR(st.st_mode)) {
1952 retval = do_for_each_reflog(log, fn, cb_data);
1953 } else {
1954 unsigned char sha1[20];
c6893323 1955 if (read_ref_full(log, sha1, 0, NULL))
eb8381c8
NP
1956 retval = error("bad ref for %s", log);
1957 else
1958 retval = fn(log, sha1, 0, cb_data);
1959 }
1960 if (retval)
1961 break;
1962 }
1963 free(log);
1964 closedir(dir);
1965 }
acb39f64 1966 else if (*base)
fcee5a14 1967 return errno;
eb8381c8
NP
1968 return retval;
1969}
1970
1971int for_each_reflog(each_ref_fn fn, void *cb_data)
1972{
1973 return do_for_each_reflog("", fn, cb_data);
1974}
3d9f037c
CR
1975
1976int update_ref(const char *action, const char *refname,
1977 const unsigned char *sha1, const unsigned char *oldval,
1978 int flags, enum action_on_err onerr)
1979{
1980 static struct ref_lock *lock;
1981 lock = lock_any_ref_for_update(refname, oldval, flags);
1982 if (!lock) {
1983 const char *str = "Cannot lock the ref '%s'.";
1984 switch (onerr) {
1985 case MSG_ON_ERR: error(str, refname); break;
1986 case DIE_ON_ERR: die(str, refname); break;
1987 case QUIET_ON_ERR: break;
1988 }
1989 return 1;
1990 }
1991 if (write_ref_sha1(lock, sha1, action) < 0) {
1992 const char *str = "Cannot update the ref '%s'.";
1993 switch (onerr) {
1994 case MSG_ON_ERR: error(str, refname); break;
1995 case DIE_ON_ERR: die(str, refname); break;
1996 case QUIET_ON_ERR: break;
1997 }
1998 return 1;
1999 }
2000 return 0;
2001}
cda69f48 2002
2c5c66be 2003int ref_exists(const char *refname)
c17b2294
JH
2004{
2005 unsigned char sha1[20];
8cad4744 2006 return !!resolve_ref_unsafe(refname, sha1, 1, NULL);
c17b2294
JH
2007}
2008
5483f799 2009struct ref *find_ref_by_name(const struct ref *list, const char *name)
cda69f48
JK
2010{
2011 for ( ; list; list = list->next)
2012 if (!strcmp(list->name, name))
5483f799 2013 return (struct ref *)list;
cda69f48
JK
2014 return NULL;
2015}
7c2b3029
JK
2016
2017/*
2018 * generate a format suitable for scanf from a ref_rev_parse_rules
2019 * rule, that is replace the "%.*s" spec with a "%s" spec
2020 */
2021static void gen_scanf_fmt(char *scanf_fmt, const char *rule)
2022{
2023 char *spec;
2024
2025 spec = strstr(rule, "%.*s");
2026 if (!spec || strstr(spec + 4, "%.*s"))
2027 die("invalid rule in ref_rev_parse_rules: %s", rule);
2028
2029 /* copy all until spec */
2030 strncpy(scanf_fmt, rule, spec - rule);
2031 scanf_fmt[spec - rule] = '\0';
2032 /* copy new spec */
2033 strcat(scanf_fmt, "%s");
2034 /* copy remaining rule */
2035 strcat(scanf_fmt, spec + 4);
2036
2037 return;
2038}
2039
dfefa935 2040char *shorten_unambiguous_ref(const char *refname, int strict)
7c2b3029
JK
2041{
2042 int i;
2043 static char **scanf_fmts;
2044 static int nr_rules;
2045 char *short_name;
2046
2047 /* pre generate scanf formats from ref_rev_parse_rules[] */
2048 if (!nr_rules) {
2049 size_t total_len = 0;
2050
2051 /* the rule list is NULL terminated, count them first */
2052 for (; ref_rev_parse_rules[nr_rules]; nr_rules++)
2053 /* no +1 because strlen("%s") < strlen("%.*s") */
2054 total_len += strlen(ref_rev_parse_rules[nr_rules]);
2055
2056 scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len);
2057
2058 total_len = 0;
2059 for (i = 0; i < nr_rules; i++) {
2060 scanf_fmts[i] = (char *)&scanf_fmts[nr_rules]
2061 + total_len;
2062 gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]);
2063 total_len += strlen(ref_rev_parse_rules[i]);
2064 }
2065 }
2066
2067 /* bail out if there are no rules */
2068 if (!nr_rules)
dfefa935 2069 return xstrdup(refname);
7c2b3029 2070
dfefa935
MH
2071 /* buffer for scanf result, at most refname must fit */
2072 short_name = xstrdup(refname);
7c2b3029
JK
2073
2074 /* skip first rule, it will always match */
2075 for (i = nr_rules - 1; i > 0 ; --i) {
2076 int j;
6e7b3309 2077 int rules_to_fail = i;
7c2b3029
JK
2078 int short_name_len;
2079
dfefa935 2080 if (1 != sscanf(refname, scanf_fmts[i], short_name))
7c2b3029
JK
2081 continue;
2082
2083 short_name_len = strlen(short_name);
2084
6e7b3309
BW
2085 /*
2086 * in strict mode, all (except the matched one) rules
2087 * must fail to resolve to a valid non-ambiguous ref
2088 */
2089 if (strict)
2090 rules_to_fail = nr_rules;
2091
7c2b3029
JK
2092 /*
2093 * check if the short name resolves to a valid ref,
2094 * but use only rules prior to the matched one
2095 */
6e7b3309 2096 for (j = 0; j < rules_to_fail; j++) {
7c2b3029 2097 const char *rule = ref_rev_parse_rules[j];
7c2b3029
JK
2098 char refname[PATH_MAX];
2099
6e7b3309
BW
2100 /* skip matched rule */
2101 if (i == j)
2102 continue;
2103
7c2b3029
JK
2104 /*
2105 * the short name is ambiguous, if it resolves
2106 * (with this previous rule) to a valid ref
2107 * read_ref() returns 0 on success
2108 */
2109 mksnpath(refname, sizeof(refname),
2110 rule, short_name_len, short_name);
c6893323 2111 if (ref_exists(refname))
7c2b3029
JK
2112 break;
2113 }
2114
2115 /*
2116 * short name is non-ambiguous if all previous rules
2117 * haven't resolved to a valid ref
2118 */
6e7b3309 2119 if (j == rules_to_fail)
7c2b3029
JK
2120 return short_name;
2121 }
2122
2123 free(short_name);
dfefa935 2124 return xstrdup(refname);
7c2b3029 2125}