do_for_each_ref_in_array(): new function
[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
bc5fd6d3
MH
7/*
8 * Make sure "ref" is something reasonable to have under ".git/refs/";
9 * We do not like it if:
10 *
11 * - any path component of it begins with ".", or
12 * - it has double dots "..", or
13 * - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
14 * - it ends with a "/".
15 * - it ends with ".lock"
16 * - it contains a "\" (backslash)
17 */
f4204ab9 18
bc5fd6d3
MH
19/* Return true iff ch is not allowed in reference names. */
20static inline int bad_ref_char(int ch)
21{
22 if (((unsigned) ch) <= ' ' || ch == 0x7f ||
23 ch == '~' || ch == '^' || ch == ':' || ch == '\\')
24 return 1;
25 /* 2.13 Pattern Matching Notation */
26 if (ch == '*' || ch == '?' || ch == '[') /* Unsupported */
27 return 1;
28 return 0;
29}
30
31/*
32 * Try to read one refname component from the front of refname. Return
33 * the length of the component found, or -1 if the component is not
34 * legal.
35 */
36static int check_refname_component(const char *refname, int flags)
37{
38 const char *cp;
39 char last = '\0';
40
41 for (cp = refname; ; cp++) {
42 char ch = *cp;
43 if (ch == '\0' || ch == '/')
44 break;
45 if (bad_ref_char(ch))
46 return -1; /* Illegal character in refname. */
47 if (last == '.' && ch == '.')
48 return -1; /* Refname contains "..". */
49 if (last == '@' && ch == '{')
50 return -1; /* Refname contains "@{". */
51 last = ch;
52 }
53 if (cp == refname)
54 return -1; /* Component has zero length. */
55 if (refname[0] == '.') {
56 if (!(flags & REFNAME_DOT_COMPONENT))
57 return -1; /* Component starts with '.'. */
58 /*
59 * Even if leading dots are allowed, don't allow "."
60 * as a component (".." is prevented by a rule above).
61 */
62 if (refname[1] == '\0')
63 return -1; /* Component equals ".". */
64 }
65 if (cp - refname >= 5 && !memcmp(cp - 5, ".lock", 5))
66 return -1; /* Refname ends with ".lock". */
67 return cp - refname;
68}
69
70int check_refname_format(const char *refname, int flags)
71{
72 int component_len, component_count = 0;
73
74 while (1) {
75 /* We are at the start of a path component. */
76 component_len = check_refname_component(refname, flags);
77 if (component_len < 0) {
78 if ((flags & REFNAME_REFSPEC_PATTERN) &&
79 refname[0] == '*' &&
80 (refname[1] == '\0' || refname[1] == '/')) {
81 /* Accept one wildcard as a full refname component. */
82 flags &= ~REFNAME_REFSPEC_PATTERN;
83 component_len = 1;
84 } else {
85 return -1;
86 }
87 }
88 component_count++;
89 if (refname[component_len] == '\0')
90 break;
91 /* Skip to next component. */
92 refname += component_len + 1;
93 }
94
95 if (refname[component_len - 1] == '.')
96 return -1; /* Refname ends with '.'. */
97 if (!(flags & REFNAME_ALLOW_ONELEVEL) && component_count < 2)
98 return -1; /* Refname has only one component. */
99 return 0;
100}
101
102struct ref_entry;
e1e22e37 103
e9c4c111
JP
104struct ref_array {
105 int nr, alloc;
e6ed3ca6
MH
106
107 /*
108 * Entries with index 0 <= i < sorted are sorted by name. New
109 * entries are appended to the list unsorted, and are sorted
110 * only when required; thus we avoid the need to sort the list
111 * after the addition of every reference.
112 */
113 int sorted;
114
e9c4c111
JP
115 struct ref_entry **refs;
116};
117
bc5fd6d3
MH
118/* ISSYMREF=0x01, ISPACKED=0x02 and ISBROKEN=0x04 are public interfaces */
119#define REF_KNOWS_PEELED 0x10
cf0adba7 120
bc5fd6d3
MH
121struct ref_entry {
122 unsigned char flag; /* ISSYMREF? ISPACKED? */
123 unsigned char sha1[20];
124 unsigned char peeled[20];
125 /* The full name of the reference (e.g., "refs/heads/master"): */
126 char name[FLEX_ARRAY];
127};
e1e22e37 128
cddc4258
MH
129static struct ref_entry *create_ref_entry(const char *refname,
130 const unsigned char *sha1, int flag,
131 int check_name)
e1e22e37
LT
132{
133 int len;
cddc4258 134 struct ref_entry *ref;
e1e22e37 135
09116a1c 136 if (check_name &&
dfefa935
MH
137 check_refname_format(refname, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT))
138 die("Reference has invalid format: '%s'", refname);
cddc4258
MH
139 len = strlen(refname) + 1;
140 ref = xmalloc(sizeof(struct ref_entry) + len);
141 hashcpy(ref->sha1, sha1);
142 hashclr(ref->peeled);
143 memcpy(ref->name, refname, len);
144 ref->flag = flag;
145 return ref;
146}
147
148/* Add a ref_entry to the end of the ref_array (unsorted). */
dd73ecd1 149static void add_ref(struct ref_array *refs, struct ref_entry *ref)
cddc4258 150{
e9c4c111 151 ALLOC_GROW(refs->refs, refs->nr + 1, refs->alloc);
cddc4258 152 refs->refs[refs->nr++] = ref;
c774aab9
JP
153}
154
bc5fd6d3
MH
155static void clear_ref_array(struct ref_array *array)
156{
157 int i;
158 for (i = 0; i < array->nr; i++)
159 free(array->refs[i]);
160 free(array->refs);
161 array->sorted = array->nr = array->alloc = 0;
162 array->refs = NULL;
163}
164
e9c4c111 165static int ref_entry_cmp(const void *a, const void *b)
c774aab9 166{
e9c4c111
JP
167 struct ref_entry *one = *(struct ref_entry **)a;
168 struct ref_entry *two = *(struct ref_entry **)b;
169 return strcmp(one->name, two->name);
170}
c774aab9 171
bc5fd6d3
MH
172static void sort_ref_array(struct ref_array *array);
173
174static struct ref_entry *search_ref_array(struct ref_array *array, const char *refname)
175{
176 struct ref_entry *e, **r;
177 int len;
178
179 if (refname == NULL)
180 return NULL;
181
182 if (!array->nr)
183 return NULL;
184 sort_ref_array(array);
185 len = strlen(refname) + 1;
186 e = xmalloc(sizeof(struct ref_entry) + len);
187 memcpy(e->name, refname, len);
188
189 r = bsearch(&e, array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp);
190
191 free(e);
192
193 if (r == NULL)
194 return NULL;
195
196 return *r;
197}
198
202a56a9
MH
199/*
200 * Emit a warning and return true iff ref1 and ref2 have the same name
201 * and the same sha1. Die if they have the same name but different
202 * sha1s.
203 */
204static int is_dup_ref(const struct ref_entry *ref1, const struct ref_entry *ref2)
205{
206 if (!strcmp(ref1->name, ref2->name)) {
207 /* Duplicate name; make sure that the SHA1s match: */
208 if (hashcmp(ref1->sha1, ref2->sha1))
209 die("Duplicated ref, and SHA1s don't match: %s",
210 ref1->name);
211 warning("Duplicated ref: %s", ref1->name);
212 return 1;
213 } else {
214 return 0;
215 }
216}
217
e6ed3ca6
MH
218/*
219 * Sort the entries in array (if they are not already sorted).
220 */
e9c4c111
JP
221static void sort_ref_array(struct ref_array *array)
222{
202a56a9 223 int i, j;
c774aab9 224
e6ed3ca6
MH
225 /*
226 * This check also prevents passing a zero-length array to qsort(),
227 * which is a problem on some platforms.
228 */
229 if (array->sorted == array->nr)
e9c4c111 230 return;
c774aab9 231
e9c4c111 232 qsort(array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp);
c774aab9 233
e9c4c111 234 /* Remove any duplicates from the ref_array */
202a56a9
MH
235 i = 0;
236 for (j = 1; j < array->nr; j++) {
237 if (is_dup_ref(array->refs[i], array->refs[j])) {
238 free(array->refs[j]);
e9c4c111
JP
239 continue;
240 }
202a56a9 241 array->refs[++i] = array->refs[j];
e9c4c111 242 }
e6ed3ca6 243 array->sorted = array->nr = i + 1;
e9c4c111 244}
c774aab9 245
bc5fd6d3 246#define DO_FOR_EACH_INCLUDE_BROKEN 01
c774aab9 247
bc5fd6d3 248static struct ref_entry *current_ref;
c774aab9 249
bc5fd6d3
MH
250static int do_one_ref(const char *base, each_ref_fn fn, int trim,
251 int flags, void *cb_data, struct ref_entry *entry)
252{
429213e4 253 int retval;
bc5fd6d3
MH
254 if (prefixcmp(entry->name, base))
255 return 0;
c774aab9 256
bc5fd6d3
MH
257 if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN)) {
258 if (entry->flag & REF_ISBROKEN)
259 return 0; /* ignore broken refs e.g. dangling symref */
260 if (!has_sha1_file(entry->sha1)) {
261 error("%s does not point to a valid object!", entry->name);
262 return 0;
263 }
264 }
265 current_ref = entry;
429213e4
MH
266 retval = fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
267 current_ref = NULL;
268 return retval;
bc5fd6d3 269}
c774aab9 270
c36b5bc2
MH
271/*
272 * Call fn for each reference in array that has index in the range
273 * offset <= index < array->nr. This function does not sort the
274 * array; sorting should be done by the caller.
275 */
276static int do_for_each_ref_in_array(struct ref_array *array, int offset,
277 const char *base,
278 each_ref_fn fn, int trim, int flags, void *cb_data)
279{
280 int i;
281 assert(array->sorted == array->nr);
282 for (i = offset; i < array->nr; i++) {
283 int retval = do_one_ref(base, fn, trim, flags, cb_data, array->refs[i]);
284 if (retval)
285 return retval;
286 }
287 return 0;
288}
289
bc5fd6d3
MH
290/*
291 * Return true iff a reference named refname could be created without
292 * conflicting with the name of an existing reference. If oldrefname
293 * is non-NULL, ignore potential conflicts with oldrefname (e.g.,
294 * because oldrefname is scheduled for deletion in the same
295 * operation).
296 */
297static int is_refname_available(const char *refname, const char *oldrefname,
298 struct ref_array *array)
299{
300 int i, namlen = strlen(refname); /* e.g. 'foo/bar' */
301 for (i = 0; i < array->nr; i++) {
302 struct ref_entry *entry = array->refs[i];
303 /* entry->name could be 'foo' or 'foo/bar/baz' */
304 if (!oldrefname || strcmp(oldrefname, entry->name)) {
305 int len = strlen(entry->name);
306 int cmplen = (namlen < len) ? namlen : len;
307 const char *lead = (namlen < len) ? entry->name : refname;
308 if (!strncmp(refname, entry->name, cmplen) &&
309 lead[cmplen] == '/') {
310 error("'%s' exists; cannot create '%s'",
311 entry->name, refname);
312 return 0;
313 }
314 }
315 }
316 return 1;
e1e22e37
LT
317}
318
5e290ff7
JH
319/*
320 * Future: need to be in "struct repository"
321 * when doing a full libification.
322 */
79c7ca54
MH
323static struct ref_cache {
324 struct ref_cache *next;
5e290ff7
JH
325 char did_loose;
326 char did_packed;
e9c4c111
JP
327 struct ref_array loose;
328 struct ref_array packed;
ce40979c
MH
329 /* The submodule name, or "" for the main repo. */
330 char name[FLEX_ARRAY];
79c7ca54 331} *ref_cache;
0e88c130 332
760c4512 333static void clear_packed_ref_cache(struct ref_cache *refs)
e1e22e37 334{
1b7edaf9 335 if (refs->did_packed)
7c59511e 336 clear_ref_array(&refs->packed);
760c4512 337 refs->did_packed = 0;
5e290ff7 338}
e1e22e37 339
760c4512
MH
340static void clear_loose_ref_cache(struct ref_cache *refs)
341{
342 if (refs->did_loose)
7c59511e 343 clear_ref_array(&refs->loose);
760c4512
MH
344 refs->did_loose = 0;
345}
346
79c7ca54 347static struct ref_cache *create_ref_cache(const char *submodule)
e5dbf605 348{
ce40979c 349 int len;
79c7ca54 350 struct ref_cache *refs;
ce40979c
MH
351 if (!submodule)
352 submodule = "";
353 len = strlen(submodule) + 1;
79c7ca54 354 refs = xcalloc(1, sizeof(struct ref_cache) + len);
ce40979c 355 memcpy(refs->name, submodule, len);
e5dbf605
MH
356 return refs;
357}
358
4349a668 359/*
79c7ca54 360 * Return a pointer to a ref_cache for the specified submodule. For
4349a668
MH
361 * the main repository, use submodule==NULL. The returned structure
362 * will be allocated and initialized but not necessarily populated; it
363 * should not be freed.
364 */
79c7ca54 365static struct ref_cache *get_ref_cache(const char *submodule)
4349a668 366{
79c7ca54 367 struct ref_cache *refs = ref_cache;
0e88c130
MH
368 if (!submodule)
369 submodule = "";
370 while (refs) {
371 if (!strcmp(submodule, refs->name))
372 return refs;
373 refs = refs->next;
4349a668 374 }
0e88c130 375
79c7ca54
MH
376 refs = create_ref_cache(submodule);
377 refs->next = ref_cache;
378 ref_cache = refs;
0e88c130 379 return refs;
4349a668
MH
380}
381
8be8bde7 382void invalidate_ref_cache(const char *submodule)
f130b116 383{
c5f29abd
MH
384 struct ref_cache *refs = get_ref_cache(submodule);
385 clear_packed_ref_cache(refs);
386 clear_loose_ref_cache(refs);
5e290ff7 387}
e1e22e37 388
bc5fd6d3
MH
389/*
390 * Parse one line from a packed-refs file. Write the SHA1 to sha1.
391 * Return a pointer to the refname within the line (null-terminated),
392 * or NULL if there was a problem.
393 */
394static const char *parse_ref_line(char *line, unsigned char *sha1)
395{
396 /*
397 * 42: the answer to everything.
398 *
399 * In this case, it happens to be the answer to
400 * 40 (length of sha1 hex representation)
401 * +1 (space in between hex and name)
402 * +1 (newline at the end of the line)
403 */
404 int len = strlen(line) - 42;
405
406 if (len <= 0)
407 return NULL;
408 if (get_sha1_hex(line, sha1) < 0)
409 return NULL;
410 if (!isspace(line[40]))
411 return NULL;
412 line += 41;
413 if (isspace(*line))
414 return NULL;
415 if (line[len] != '\n')
416 return NULL;
417 line[len] = 0;
418
419 return line;
420}
421
2c5c66be 422static void read_packed_refs(FILE *f, struct ref_array *array)
f4204ab9 423{
e9c4c111 424 struct ref_entry *last = NULL;
f4204ab9
JH
425 char refline[PATH_MAX];
426 int flag = REF_ISPACKED;
427
428 while (fgets(refline, sizeof(refline), f)) {
429 unsigned char sha1[20];
dfefa935 430 const char *refname;
f4204ab9
JH
431 static const char header[] = "# pack-refs with:";
432
433 if (!strncmp(refline, header, sizeof(header)-1)) {
434 const char *traits = refline + sizeof(header) - 1;
435 if (strstr(traits, " peeled "))
436 flag |= REF_KNOWS_PEELED;
437 /* perhaps other traits later as well */
438 continue;
439 }
440
dfefa935
MH
441 refname = parse_ref_line(refline, sha1);
442 if (refname) {
dd73ecd1
MH
443 last = create_ref_entry(refname, sha1, flag, 1);
444 add_ref(array, last);
f4204ab9
JH
445 continue;
446 }
447 if (last &&
448 refline[0] == '^' &&
449 strlen(refline) == 42 &&
450 refline[41] == '\n' &&
451 !get_sha1_hex(refline + 1, sha1))
452 hashcpy(last->peeled, sha1);
453 }
f4204ab9
JH
454}
455
316b097a 456static struct ref_array *get_packed_refs(struct ref_cache *refs)
5e290ff7 457{
4349a668
MH
458 if (!refs->did_packed) {
459 const char *packed_refs_file;
460 FILE *f;
0bad611b 461
316b097a
MH
462 if (*refs->name)
463 packed_refs_file = git_path_submodule(refs->name, "packed-refs");
4349a668
MH
464 else
465 packed_refs_file = git_path("packed-refs");
466 f = fopen(packed_refs_file, "r");
e1e22e37 467 if (f) {
2c5c66be 468 read_packed_refs(f, &refs->packed);
e1e22e37 469 fclose(f);
e1e22e37 470 }
0bad611b 471 refs->did_packed = 1;
e1e22e37 472 }
e9c4c111 473 return &refs->packed;
e1e22e37
LT
474}
475
30249ee6
MH
476void add_packed_ref(const char *refname, const unsigned char *sha1)
477{
478 add_ref(get_packed_refs(get_ref_cache(NULL)),
479 create_ref_entry(refname, sha1, REF_ISPACKED, 1));
480}
481
3b124823 482static void get_ref_dir(struct ref_cache *refs, const char *base,
e9c4c111 483 struct ref_array *array)
e1e22e37 484{
0bad611b
HV
485 DIR *dir;
486 const char *path;
487
3b124823
MH
488 if (*refs->name)
489 path = git_path_submodule(refs->name, "%s", base);
0bad611b
HV
490 else
491 path = git_path("%s", base);
492
0bad611b 493 dir = opendir(path);
e1e22e37
LT
494
495 if (dir) {
496 struct dirent *de;
497 int baselen = strlen(base);
dfefa935 498 char *refname = xmalloc(baselen + 257);
e1e22e37 499
dfefa935 500 memcpy(refname, base, baselen);
e1e22e37 501 if (baselen && base[baselen-1] != '/')
dfefa935 502 refname[baselen++] = '/';
e1e22e37
LT
503
504 while ((de = readdir(dir)) != NULL) {
505 unsigned char sha1[20];
506 struct stat st;
8da19775 507 int flag;
e1e22e37 508 int namelen;
0bad611b 509 const char *refdir;
e1e22e37
LT
510
511 if (de->d_name[0] == '.')
512 continue;
513 namelen = strlen(de->d_name);
514 if (namelen > 255)
515 continue;
516 if (has_extension(de->d_name, ".lock"))
517 continue;
dfefa935 518 memcpy(refname + baselen, de->d_name, namelen+1);
3b124823
MH
519 refdir = *refs->name
520 ? git_path_submodule(refs->name, "%s", refname)
dfefa935 521 : git_path("%s", refname);
0bad611b 522 if (stat(refdir, &st) < 0)
e1e22e37
LT
523 continue;
524 if (S_ISDIR(st.st_mode)) {
3b124823 525 get_ref_dir(refs, refname, array);
e1e22e37
LT
526 continue;
527 }
3b124823 528 if (*refs->name) {
f8948e2f 529 hashclr(sha1);
0bad611b 530 flag = 0;
3b124823 531 if (resolve_gitlink_ref(refs->name, refname, sha1) < 0) {
0bad611b 532 hashclr(sha1);
98ac34b2 533 flag |= REF_ISBROKEN;
0bad611b 534 }
dfefa935 535 } else if (read_ref_full(refname, sha1, 1, &flag)) {
09116a1c
JH
536 hashclr(sha1);
537 flag |= REF_ISBROKEN;
538 }
dd73ecd1 539 add_ref(array, create_ref_entry(refname, sha1, flag, 1));
e1e22e37 540 }
dfefa935 541 free(refname);
e1e22e37
LT
542 closedir(dir);
543 }
e1e22e37
LT
544}
545
316b097a 546static struct ref_array *get_loose_refs(struct ref_cache *refs)
e1e22e37 547{
4349a668 548 if (!refs->did_loose) {
3b124823 549 get_ref_dir(refs, "refs", &refs->loose);
4349a668 550 refs->did_loose = 1;
e1e22e37 551 }
2c5c66be 552 return &refs->loose;
e1e22e37
LT
553}
554
ca8db142
LT
555/* We allow "recursive" symbolic refs. Only within reason, though */
556#define MAXDEPTH 5
0ebde32c
LT
557#define MAXREFLEN (1024)
558
e5fa45c1
JH
559/*
560 * Called by resolve_gitlink_ref_recursive() after it failed to read
b0626608
MH
561 * from the loose refs in ref_cache refs. Find <refname> in the
562 * packed-refs file for the submodule.
e5fa45c1 563 */
b0626608 564static int resolve_gitlink_packed_ref(struct ref_cache *refs,
85be1fe3 565 const char *refname, unsigned char *sha1)
0ebde32c 566{
2c5c66be 567 struct ref_entry *ref;
b0626608 568 struct ref_array *array = get_packed_refs(refs);
0ebde32c 569
2c5c66be 570 ref = search_ref_array(array, refname);
b0626608
MH
571 if (ref == NULL)
572 return -1;
573
574 memcpy(sha1, ref->sha1, 20);
575 return 0;
0ebde32c
LT
576}
577
b0626608 578static int resolve_gitlink_ref_recursive(struct ref_cache *refs,
85be1fe3 579 const char *refname, unsigned char *sha1,
dfefa935 580 int recursion)
0ebde32c 581{
064d51dc 582 int fd, len;
0ebde32c 583 char buffer[128], *p;
064d51dc 584 char *path;
0ebde32c 585
064d51dc 586 if (recursion > MAXDEPTH || strlen(refname) > MAXREFLEN)
0ebde32c 587 return -1;
064d51dc
MH
588 path = *refs->name
589 ? git_path_submodule(refs->name, "%s", refname)
590 : git_path("%s", refname);
591 fd = open(path, O_RDONLY);
0ebde32c 592 if (fd < 0)
b0626608 593 return resolve_gitlink_packed_ref(refs, refname, sha1);
0ebde32c
LT
594
595 len = read(fd, buffer, sizeof(buffer)-1);
596 close(fd);
597 if (len < 0)
598 return -1;
599 while (len && isspace(buffer[len-1]))
600 len--;
601 buffer[len] = 0;
602
603 /* Was it a detached head or an old-fashioned symlink? */
85be1fe3 604 if (!get_sha1_hex(buffer, sha1))
0ebde32c
LT
605 return 0;
606
607 /* Symref? */
608 if (strncmp(buffer, "ref:", 4))
609 return -1;
610 p = buffer + 4;
611 while (isspace(*p))
612 p++;
613
064d51dc 614 return resolve_gitlink_ref_recursive(refs, p, sha1, recursion+1);
0ebde32c
LT
615}
616
85be1fe3 617int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *sha1)
0ebde32c
LT
618{
619 int len = strlen(path), retval;
064d51dc 620 char *submodule;
b0626608 621 struct ref_cache *refs;
0ebde32c
LT
622
623 while (len && path[len-1] == '/')
624 len--;
625 if (!len)
626 return -1;
b0626608
MH
627 submodule = xstrndup(path, len);
628 refs = get_ref_cache(submodule);
629 free(submodule);
630
064d51dc 631 retval = resolve_gitlink_ref_recursive(refs, refname, sha1, 0);
0ebde32c
LT
632 return retval;
633}
ca8db142 634
4886b89f 635/*
c224ca7f
MH
636 * Try to read ref from the packed references. On success, set sha1
637 * and return 0; otherwise, return -1.
4886b89f 638 */
dfefa935 639static int get_packed_ref(const char *refname, unsigned char *sha1)
c224ca7f 640{
316b097a 641 struct ref_array *packed = get_packed_refs(get_ref_cache(NULL));
dfefa935 642 struct ref_entry *entry = search_ref_array(packed, refname);
2c5c66be
JH
643 if (entry) {
644 hashcpy(sha1, entry->sha1);
645 return 0;
c224ca7f
MH
646 }
647 return -1;
648}
649
8d68493f 650const char *resolve_ref_unsafe(const char *refname, unsigned char *sha1, int reading, int *flag)
8a65ff76 651{
0104ca09
HO
652 int depth = MAXDEPTH;
653 ssize_t len;
a876ed83 654 char buffer[256];
dfefa935 655 static char refname_buffer[256];
ca8db142 656
8da19775
JH
657 if (flag)
658 *flag = 0;
659
dfefa935 660 if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
8384d788
MH
661 return NULL;
662
a876ed83 663 for (;;) {
55956350 664 char path[PATH_MAX];
a876ed83
JH
665 struct stat st;
666 char *buf;
667 int fd;
8a65ff76 668
a876ed83
JH
669 if (--depth < 0)
670 return NULL;
ca8db142 671
dfefa935 672 git_snpath(path, sizeof(path), "%s", refname);
c224ca7f 673
a876ed83 674 if (lstat(path, &st) < 0) {
c224ca7f
MH
675 if (errno != ENOENT)
676 return NULL;
677 /*
678 * The loose reference file does not exist;
679 * check for a packed reference.
680 */
dfefa935 681 if (!get_packed_ref(refname, sha1)) {
c224ca7f
MH
682 if (flag)
683 *flag |= REF_ISPACKED;
dfefa935 684 return refname;
434cd0cd 685 }
c224ca7f
MH
686 /* The reference is not a packed reference, either. */
687 if (reading) {
a876ed83 688 return NULL;
c224ca7f
MH
689 } else {
690 hashclr(sha1);
dfefa935 691 return refname;
c224ca7f 692 }
a876ed83 693 }
ca8db142 694
a876ed83
JH
695 /* Follow "normalized" - ie "refs/.." symlinks by hand */
696 if (S_ISLNK(st.st_mode)) {
697 len = readlink(path, buffer, sizeof(buffer)-1);
7bb2bf8e
MH
698 if (len < 0)
699 return NULL;
b54cb795 700 buffer[len] = 0;
1f58a038
MH
701 if (!prefixcmp(buffer, "refs/") &&
702 !check_refname_format(buffer, 0)) {
dfefa935
MH
703 strcpy(refname_buffer, buffer);
704 refname = refname_buffer;
8da19775
JH
705 if (flag)
706 *flag |= REF_ISSYMREF;
a876ed83
JH
707 continue;
708 }
ca8db142 709 }
a876ed83 710
7a21632f
DS
711 /* Is it a directory? */
712 if (S_ISDIR(st.st_mode)) {
713 errno = EISDIR;
714 return NULL;
715 }
716
a876ed83
JH
717 /*
718 * Anything else, just open it and try to use it as
719 * a ref
720 */
721 fd = open(path, O_RDONLY);
722 if (fd < 0)
723 return NULL;
93d26e4c 724 len = read_in_full(fd, buffer, sizeof(buffer)-1);
a876ed83 725 close(fd);
28775050
MH
726 if (len < 0)
727 return NULL;
728 while (len && isspace(buffer[len-1]))
729 len--;
730 buffer[len] = '\0';
a876ed83
JH
731
732 /*
733 * Is it a symbolic ref?
734 */
28775050 735 if (prefixcmp(buffer, "ref:"))
a876ed83 736 break;
55956350
JH
737 if (flag)
738 *flag |= REF_ISSYMREF;
a876ed83 739 buf = buffer + 4;
28775050
MH
740 while (isspace(*buf))
741 buf++;
313fb010 742 if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) {
55956350
JH
743 if (flag)
744 *flag |= REF_ISBROKEN;
313fb010
MH
745 return NULL;
746 }
dfefa935 747 refname = strcpy(refname_buffer, buf);
8a65ff76 748 }
f989fea0
MH
749 /* Please note that FETCH_HEAD has a second line containing other data. */
750 if (get_sha1_hex(buffer, sha1) || (buffer[40] != '\0' && !isspace(buffer[40]))) {
55956350
JH
751 if (flag)
752 *flag |= REF_ISBROKEN;
a876ed83 753 return NULL;
629cd3ac 754 }
dfefa935 755 return refname;
a876ed83
JH
756}
757
96ec7b1e
NTND
758char *resolve_refdup(const char *ref, unsigned char *sha1, int reading, int *flag)
759{
8cad4744 760 const char *ret = resolve_ref_unsafe(ref, sha1, reading, flag);
96ec7b1e
NTND
761 return ret ? xstrdup(ret) : NULL;
762}
763
d08bae7e
IL
764/* The argument to filter_refs */
765struct ref_filter {
766 const char *pattern;
767 each_ref_fn *fn;
768 void *cb_data;
769};
770
dfefa935 771int read_ref_full(const char *refname, unsigned char *sha1, int reading, int *flags)
a876ed83 772{
8d68493f 773 if (resolve_ref_unsafe(refname, sha1, reading, flags))
a876ed83
JH
774 return 0;
775 return -1;
8a65ff76
LT
776}
777
dfefa935 778int read_ref(const char *refname, unsigned char *sha1)
c6893323 779{
dfefa935 780 return read_ref_full(refname, sha1, 1, NULL);
c6893323
NTND
781}
782
bc5fd6d3 783int ref_exists(const char *refname)
ef06b918 784{
bc5fd6d3
MH
785 unsigned char sha1[20];
786 return !!resolve_ref_unsafe(refname, sha1, 1, NULL);
ef06b918
JH
787}
788
85be1fe3 789static int filter_refs(const char *refname, const unsigned char *sha1, int flags,
dfefa935 790 void *data)
d08bae7e
IL
791{
792 struct ref_filter *filter = (struct ref_filter *)data;
dfefa935 793 if (fnmatch(filter->pattern, refname, 0))
d08bae7e 794 return 0;
85be1fe3 795 return filter->fn(refname, sha1, flags, filter->cb_data);
d08bae7e
IL
796}
797
dfefa935 798int peel_ref(const char *refname, unsigned char *sha1)
cf0adba7
JH
799{
800 int flag;
801 unsigned char base[20];
802 struct object *o;
803
dfefa935
MH
804 if (current_ref && (current_ref->name == refname
805 || !strcmp(current_ref->name, refname))) {
0ae91be0
SP
806 if (current_ref->flag & REF_KNOWS_PEELED) {
807 hashcpy(sha1, current_ref->peeled);
808 return 0;
809 }
810 hashcpy(base, current_ref->sha1);
811 goto fallback;
812 }
813
dfefa935 814 if (read_ref_full(refname, base, 1, &flag))
cf0adba7
JH
815 return -1;
816
817 if ((flag & REF_ISPACKED)) {
316b097a 818 struct ref_array *array = get_packed_refs(get_ref_cache(NULL));
dfefa935 819 struct ref_entry *r = search_ref_array(array, refname);
cf0adba7 820
e9c4c111
JP
821 if (r != NULL && r->flag & REF_KNOWS_PEELED) {
822 hashcpy(sha1, r->peeled);
823 return 0;
cf0adba7 824 }
cf0adba7
JH
825 }
826
0ae91be0 827fallback:
cf0adba7 828 o = parse_object(base);
8c87dc77 829 if (o && o->type == OBJ_TAG) {
dfefa935 830 o = deref_tag(o, refname, 0);
cf0adba7
JH
831 if (o) {
832 hashcpy(sha1, o->sha1);
833 return 0;
834 }
835 }
836 return -1;
837}
838
bc5fd6d3
MH
839struct warn_if_dangling_data {
840 FILE *fp;
841 const char *refname;
842 const char *msg_fmt;
843};
844
845static int warn_if_dangling_symref(const char *refname, const unsigned char *sha1,
846 int flags, void *cb_data)
847{
848 struct warn_if_dangling_data *d = cb_data;
849 const char *resolves_to;
850 unsigned char junk[20];
851
852 if (!(flags & REF_ISSYMREF))
853 return 0;
854
855 resolves_to = resolve_ref_unsafe(refname, junk, 0, NULL);
856 if (!resolves_to || strcmp(resolves_to, d->refname))
857 return 0;
858
859 fprintf(d->fp, d->msg_fmt, refname);
860 return 0;
861}
862
863void warn_dangling_symref(FILE *fp, const char *msg_fmt, const char *refname)
864{
865 struct warn_if_dangling_data data;
866
867 data.fp = fp;
868 data.refname = refname;
869 data.msg_fmt = msg_fmt;
870 for_each_rawref(warn_if_dangling_symref, &data);
871}
872
0bad611b
HV
873static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn,
874 int trim, int flags, void *cb_data)
8a65ff76 875{
cf6672ed 876 int retval = 0, p = 0, l = 0;
316b097a
MH
877 struct ref_cache *refs = get_ref_cache(submodule);
878 struct ref_array *packed = get_packed_refs(refs);
879 struct ref_array *loose = get_loose_refs(refs);
8a65ff76 880
e6ed3ca6
MH
881 sort_ref_array(packed);
882 sort_ref_array(loose);
e9c4c111
JP
883 while (p < packed->nr && l < loose->nr) {
884 struct ref_entry *entry;
885 int cmp = strcmp(packed->refs[p]->name, loose->refs[l]->name);
e1e22e37 886 if (!cmp) {
e9c4c111 887 p++;
e1e22e37 888 continue;
6cada6a9 889 }
e1e22e37 890 if (cmp > 0) {
e9c4c111 891 entry = loose->refs[l++];
e1e22e37 892 } else {
e9c4c111 893 entry = packed->refs[p++];
e1e22e37 894 }
f8948e2f 895 retval = do_one_ref(base, fn, trim, flags, cb_data, entry);
e1e22e37 896 if (retval)
429213e4 897 return retval;
e1e22e37 898 }
8a65ff76 899
c36b5bc2
MH
900 if (l < loose->nr)
901 return do_for_each_ref_in_array(loose, l, base, fn, trim, flags, cb_data);
902 if (p < packed->nr)
903 return do_for_each_ref_in_array(packed, p, base, fn, trim, flags, cb_data);
0ae91be0 904
429213e4 905 return 0;
8a65ff76
LT
906}
907
0bad611b 908static int do_head_ref(const char *submodule, each_ref_fn fn, void *cb_data)
723c31fe
LT
909{
910 unsigned char sha1[20];
8da19775
JH
911 int flag;
912
0bad611b
HV
913 if (submodule) {
914 if (resolve_gitlink_ref(submodule, "HEAD", sha1) == 0)
915 return fn("HEAD", sha1, 0, cb_data);
916
917 return 0;
918 }
919
c6893323 920 if (!read_ref_full("HEAD", sha1, 1, &flag))
8da19775 921 return fn("HEAD", sha1, flag, cb_data);
0bad611b 922
2f34ba32 923 return 0;
723c31fe
LT
924}
925
0bad611b
HV
926int head_ref(each_ref_fn fn, void *cb_data)
927{
928 return do_head_ref(NULL, fn, cb_data);
929}
930
9ef6aeb0
HV
931int head_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
932{
933 return do_head_ref(submodule, fn, cb_data);
934}
935
cb5d709f 936int for_each_ref(each_ref_fn fn, void *cb_data)
8a65ff76 937{
b3cfc406 938 return do_for_each_ref(NULL, "", fn, 0, 0, cb_data);
a62be77f
SE
939}
940
9ef6aeb0
HV
941int for_each_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
942{
b3cfc406 943 return do_for_each_ref(submodule, "", fn, 0, 0, cb_data);
a62be77f
SE
944}
945
2a8177b6
CC
946int for_each_ref_in(const char *prefix, each_ref_fn fn, void *cb_data)
947{
0bad611b 948 return do_for_each_ref(NULL, prefix, fn, strlen(prefix), 0, cb_data);
2a8177b6
CC
949}
950
9ef6aeb0
HV
951int for_each_ref_in_submodule(const char *submodule, const char *prefix,
952 each_ref_fn fn, void *cb_data)
953{
954 return do_for_each_ref(submodule, prefix, fn, strlen(prefix), 0, cb_data);
2a8177b6
CC
955}
956
cb5d709f 957int for_each_tag_ref(each_ref_fn fn, void *cb_data)
a62be77f 958{
2a8177b6 959 return for_each_ref_in("refs/tags/", fn, cb_data);
a62be77f
SE
960}
961
9ef6aeb0
HV
962int for_each_tag_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
963{
964 return for_each_ref_in_submodule(submodule, "refs/tags/", fn, cb_data);
965}
966
cb5d709f 967int for_each_branch_ref(each_ref_fn fn, void *cb_data)
a62be77f 968{
2a8177b6 969 return for_each_ref_in("refs/heads/", fn, cb_data);
a62be77f
SE
970}
971
9ef6aeb0
HV
972int for_each_branch_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
973{
974 return for_each_ref_in_submodule(submodule, "refs/heads/", fn, cb_data);
975}
976
cb5d709f 977int for_each_remote_ref(each_ref_fn fn, void *cb_data)
a62be77f 978{
2a8177b6 979 return for_each_ref_in("refs/remotes/", fn, cb_data);
f8948e2f
JH
980}
981
9ef6aeb0
HV
982int for_each_remote_ref_submodule(const char *submodule, each_ref_fn fn, void *cb_data)
983{
984 return for_each_ref_in_submodule(submodule, "refs/remotes/", fn, cb_data);
985}
986
29268700
CC
987int for_each_replace_ref(each_ref_fn fn, void *cb_data)
988{
0bad611b 989 return do_for_each_ref(NULL, "refs/replace/", fn, 13, 0, cb_data);
29268700
CC
990}
991
a1bea2c1
JT
992int head_ref_namespaced(each_ref_fn fn, void *cb_data)
993{
994 struct strbuf buf = STRBUF_INIT;
995 int ret = 0;
996 unsigned char sha1[20];
997 int flag;
998
999 strbuf_addf(&buf, "%sHEAD", get_git_namespace());
c6893323 1000 if (!read_ref_full(buf.buf, sha1, 1, &flag))
a1bea2c1
JT
1001 ret = fn(buf.buf, sha1, flag, cb_data);
1002 strbuf_release(&buf);
1003
1004 return ret;
1005}
1006
1007int for_each_namespaced_ref(each_ref_fn fn, void *cb_data)
1008{
1009 struct strbuf buf = STRBUF_INIT;
1010 int ret;
1011 strbuf_addf(&buf, "%srefs/", get_git_namespace());
1012 ret = do_for_each_ref(NULL, buf.buf, fn, 0, 0, cb_data);
1013 strbuf_release(&buf);
1014 return ret;
1015}
1016
b09fe971
IL
1017int for_each_glob_ref_in(each_ref_fn fn, const char *pattern,
1018 const char *prefix, void *cb_data)
d08bae7e
IL
1019{
1020 struct strbuf real_pattern = STRBUF_INIT;
1021 struct ref_filter filter;
d08bae7e
IL
1022 int ret;
1023
b09fe971 1024 if (!prefix && prefixcmp(pattern, "refs/"))
d08bae7e 1025 strbuf_addstr(&real_pattern, "refs/");
b09fe971
IL
1026 else if (prefix)
1027 strbuf_addstr(&real_pattern, prefix);
d08bae7e
IL
1028 strbuf_addstr(&real_pattern, pattern);
1029
894a9d33 1030 if (!has_glob_specials(pattern)) {
9517e6b8 1031 /* Append implied '/' '*' if not present. */
d08bae7e
IL
1032 if (real_pattern.buf[real_pattern.len - 1] != '/')
1033 strbuf_addch(&real_pattern, '/');
1034 /* No need to check for '*', there is none. */
1035 strbuf_addch(&real_pattern, '*');
1036 }
1037
1038 filter.pattern = real_pattern.buf;
1039 filter.fn = fn;
1040 filter.cb_data = cb_data;
1041 ret = for_each_ref(filter_refs, &filter);
1042
1043 strbuf_release(&real_pattern);
1044 return ret;
1045}
1046
b09fe971
IL
1047int for_each_glob_ref(each_ref_fn fn, const char *pattern, void *cb_data)
1048{
1049 return for_each_glob_ref_in(fn, pattern, NULL, cb_data);
1050}
1051
f8948e2f
JH
1052int for_each_rawref(each_ref_fn fn, void *cb_data)
1053{
b3cfc406 1054 return do_for_each_ref(NULL, "", fn, 0,
f8948e2f 1055 DO_FOR_EACH_INCLUDE_BROKEN, cb_data);
8a65ff76
LT
1056}
1057
4577e483 1058const char *prettify_refname(const char *name)
a9c37a72 1059{
a9c37a72
DB
1060 return name + (
1061 !prefixcmp(name, "refs/heads/") ? 11 :
1062 !prefixcmp(name, "refs/tags/") ? 10 :
1063 !prefixcmp(name, "refs/remotes/") ? 13 :
1064 0);
1065}
1066
79803322
SP
1067const char *ref_rev_parse_rules[] = {
1068 "%.*s",
1069 "refs/%.*s",
1070 "refs/tags/%.*s",
1071 "refs/heads/%.*s",
1072 "refs/remotes/%.*s",
1073 "refs/remotes/%.*s/HEAD",
1074 NULL
1075};
1076
1077int refname_match(const char *abbrev_name, const char *full_name, const char **rules)
1078{
1079 const char **p;
1080 const int abbrev_name_len = strlen(abbrev_name);
1081
1082 for (p = rules; *p; p++) {
1083 if (!strcmp(full_name, mkpath(*p, abbrev_name_len, abbrev_name))) {
1084 return 1;
1085 }
1086 }
1087
1088 return 0;
1089}
1090
e5f38ec3 1091static struct ref_lock *verify_lock(struct ref_lock *lock,
4bd18c43
SP
1092 const unsigned char *old_sha1, int mustexist)
1093{
c6893323 1094 if (read_ref_full(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
434cd0cd 1095 error("Can't verify ref %s", lock->ref_name);
4bd18c43
SP
1096 unlock_ref(lock);
1097 return NULL;
1098 }
a89fccd2 1099 if (hashcmp(lock->old_sha1, old_sha1)) {
434cd0cd 1100 error("Ref %s is at %s but expected %s", lock->ref_name,
4bd18c43
SP
1101 sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
1102 unlock_ref(lock);
1103 return NULL;
1104 }
1105 return lock;
1106}
1107
7155b727 1108static int remove_empty_directories(const char *file)
bc7127ef
JH
1109{
1110 /* we want to create a file but there is a directory there;
1111 * if that is an empty directory (or a directory that contains
1112 * only empty directories), remove them.
1113 */
7155b727
JS
1114 struct strbuf path;
1115 int result;
bc7127ef 1116
7155b727
JS
1117 strbuf_init(&path, 20);
1118 strbuf_addstr(&path, file);
1119
a0f4afbe 1120 result = remove_dir_recursively(&path, REMOVE_DIR_EMPTY_ONLY);
7155b727
JS
1121
1122 strbuf_release(&path);
1123
1124 return result;
bc7127ef
JH
1125}
1126
ff74f7f1
JH
1127/*
1128 * *string and *len will only be substituted, and *string returned (for
1129 * later free()ing) if the string passed in is a magic short-hand form
1130 * to name a branch.
1131 */
1132static char *substitute_branch_name(const char **string, int *len)
1133{
1134 struct strbuf buf = STRBUF_INIT;
1135 int ret = interpret_branch_name(*string, &buf);
1136
1137 if (ret == *len) {
1138 size_t size;
1139 *string = strbuf_detach(&buf, &size);
1140 *len = size;
1141 return (char *)*string;
1142 }
1143
1144 return NULL;
1145}
1146
1147int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref)
1148{
1149 char *last_branch = substitute_branch_name(&str, &len);
1150 const char **p, *r;
1151 int refs_found = 0;
1152
1153 *ref = NULL;
1154 for (p = ref_rev_parse_rules; *p; p++) {
1155 char fullref[PATH_MAX];
1156 unsigned char sha1_from_ref[20];
1157 unsigned char *this_result;
1158 int flag;
1159
1160 this_result = refs_found ? sha1_from_ref : sha1;
1161 mksnpath(fullref, sizeof(fullref), *p, len, str);
8cad4744 1162 r = resolve_ref_unsafe(fullref, this_result, 1, &flag);
ff74f7f1
JH
1163 if (r) {
1164 if (!refs_found++)
1165 *ref = xstrdup(r);
1166 if (!warn_ambiguous_refs)
1167 break;
55956350 1168 } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) {
ff74f7f1 1169 warning("ignoring dangling symref %s.", fullref);
55956350
JH
1170 } else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) {
1171 warning("ignoring broken ref %s.", fullref);
1172 }
ff74f7f1
JH
1173 }
1174 free(last_branch);
1175 return refs_found;
1176}
1177
1178int dwim_log(const char *str, int len, unsigned char *sha1, char **log)
1179{
1180 char *last_branch = substitute_branch_name(&str, &len);
1181 const char **p;
1182 int logs_found = 0;
1183
1184 *log = NULL;
1185 for (p = ref_rev_parse_rules; *p; p++) {
1186 struct stat st;
1187 unsigned char hash[20];
1188 char path[PATH_MAX];
1189 const char *ref, *it;
1190
1191 mksnpath(path, sizeof(path), *p, len, str);
8cad4744 1192 ref = resolve_ref_unsafe(path, hash, 1, NULL);
ff74f7f1
JH
1193 if (!ref)
1194 continue;
1195 if (!stat(git_path("logs/%s", path), &st) &&
1196 S_ISREG(st.st_mode))
1197 it = path;
1198 else if (strcmp(ref, path) &&
1199 !stat(git_path("logs/%s", ref), &st) &&
1200 S_ISREG(st.st_mode))
1201 it = ref;
1202 else
1203 continue;
1204 if (!logs_found++) {
1205 *log = xstrdup(it);
1206 hashcpy(sha1, hash);
1207 }
1208 if (!warn_ambiguous_refs)
1209 break;
1210 }
1211 free(last_branch);
1212 return logs_found;
1213}
1214
dfefa935
MH
1215static struct ref_lock *lock_ref_sha1_basic(const char *refname,
1216 const unsigned char *old_sha1,
1217 int flags, int *type_p)
4bd18c43 1218{
434cd0cd 1219 char *ref_file;
dfefa935 1220 const char *orig_refname = refname;
4bd18c43 1221 struct ref_lock *lock;
5cc3cef9 1222 int last_errno = 0;
acd3b9ec 1223 int type, lflags;
4431fcc4 1224 int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
5bdd8d4a 1225 int missing = 0;
4bd18c43
SP
1226
1227 lock = xcalloc(1, sizeof(struct ref_lock));
1228 lock->lock_fd = -1;
1229
8d68493f 1230 refname = resolve_ref_unsafe(refname, lock->old_sha1, mustexist, &type);
dfefa935 1231 if (!refname && errno == EISDIR) {
bc7127ef
JH
1232 /* we are trying to lock foo but we used to
1233 * have foo/bar which now does not exist;
1234 * it is normal for the empty directory 'foo'
1235 * to remain.
1236 */
dfefa935 1237 ref_file = git_path("%s", orig_refname);
5cc3cef9
JH
1238 if (remove_empty_directories(ref_file)) {
1239 last_errno = errno;
dfefa935 1240 error("there are still refs under '%s'", orig_refname);
5cc3cef9
JH
1241 goto error_return;
1242 }
8d68493f 1243 refname = resolve_ref_unsafe(orig_refname, lock->old_sha1, mustexist, &type);
bc7127ef 1244 }
68db31cc
SV
1245 if (type_p)
1246 *type_p = type;
dfefa935 1247 if (!refname) {
5cc3cef9 1248 last_errno = errno;
818f477c 1249 error("unable to resolve reference %s: %s",
dfefa935 1250 orig_refname, strerror(errno));
5cc3cef9 1251 goto error_return;
4bd18c43 1252 }
5bdd8d4a 1253 missing = is_null_sha1(lock->old_sha1);
c976d415
LH
1254 /* When the ref did not exist and we are creating it,
1255 * make sure there is no existing ref that is packed
1256 * whose name begins with our refname, nor a ref whose
1257 * name is a proper prefix of our refname.
1258 */
5bdd8d4a 1259 if (missing &&
316b097a 1260 !is_refname_available(refname, NULL, get_packed_refs(get_ref_cache(NULL)))) {
f475e08e 1261 last_errno = ENOTDIR;
c976d415 1262 goto error_return;
f475e08e 1263 }
22a3844e 1264
c33d5174 1265 lock->lk = xcalloc(1, sizeof(struct lock_file));
4bd18c43 1266
acd3b9ec
JH
1267 lflags = LOCK_DIE_ON_ERROR;
1268 if (flags & REF_NODEREF) {
dfefa935 1269 refname = orig_refname;
acd3b9ec
JH
1270 lflags |= LOCK_NODEREF;
1271 }
dfefa935
MH
1272 lock->ref_name = xstrdup(refname);
1273 lock->orig_ref_name = xstrdup(orig_refname);
1274 ref_file = git_path("%s", refname);
5bdd8d4a 1275 if (missing)
68db31cc
SV
1276 lock->force_write = 1;
1277 if ((flags & REF_NODEREF) && (type & REF_ISSYMREF))
1278 lock->force_write = 1;
4bd18c43 1279
5cc3cef9
JH
1280 if (safe_create_leading_directories(ref_file)) {
1281 last_errno = errno;
1282 error("unable to create directory for %s", ref_file);
1283 goto error_return;
1284 }
4bd18c43 1285
acd3b9ec 1286 lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, lflags);
4bd18c43 1287 return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
5cc3cef9
JH
1288
1289 error_return:
1290 unlock_ref(lock);
1291 errno = last_errno;
1292 return NULL;
4bd18c43
SP
1293}
1294
dfefa935 1295struct ref_lock *lock_ref_sha1(const char *refname, const unsigned char *old_sha1)
95fc7512 1296{
53cce84c 1297 char refpath[PATH_MAX];
dfefa935 1298 if (check_refname_format(refname, 0))
4bd18c43 1299 return NULL;
dfefa935 1300 strcpy(refpath, mkpath("refs/%s", refname));
68db31cc 1301 return lock_ref_sha1_basic(refpath, old_sha1, 0, NULL);
4bd18c43
SP
1302}
1303
dfefa935
MH
1304struct ref_lock *lock_any_ref_for_update(const char *refname,
1305 const unsigned char *old_sha1, int flags)
4bd18c43 1306{
dfefa935 1307 if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
257f3020 1308 return NULL;
dfefa935 1309 return lock_ref_sha1_basic(refname, old_sha1, flags, NULL);
c0277d15
JH
1310}
1311
26a063a1
JH
1312static struct lock_file packlock;
1313
c0277d15
JH
1314static int repack_without_ref(const char *refname)
1315{
e9c4c111 1316 struct ref_array *packed;
e9c4c111 1317 int fd, i;
c0277d15 1318
316b097a 1319 packed = get_packed_refs(get_ref_cache(NULL));
fe9c7b78 1320 if (search_ref_array(packed, refname) == NULL)
c0277d15 1321 return 0;
c0277d15 1322 fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
1b018fd9
MV
1323 if (fd < 0) {
1324 unable_to_lock_error(git_path("packed-refs"), errno);
c0277d15 1325 return error("cannot delete '%s' from packed refs", refname);
1b018fd9 1326 }
c0277d15 1327
e9c4c111 1328 for (i = 0; i < packed->nr; i++) {
c0277d15
JH
1329 char line[PATH_MAX + 100];
1330 int len;
fe9c7b78 1331 struct ref_entry *ref = packed->refs[i];
e9c4c111
JP
1332
1333 if (!strcmp(refname, ref->name))
c0277d15
JH
1334 continue;
1335 len = snprintf(line, sizeof(line), "%s %s\n",
e9c4c111 1336 sha1_to_hex(ref->sha1), ref->name);
c0277d15
JH
1337 /* this should not happen but just being defensive */
1338 if (len > sizeof(line))
e9c4c111 1339 die("too long a refname '%s'", ref->name);
c0277d15
JH
1340 write_or_die(fd, line, len);
1341 }
1342 return commit_lock_file(&packlock);
1343}
1344
eca35a25 1345int delete_ref(const char *refname, const unsigned char *sha1, int delopt)
c0277d15
JH
1346{
1347 struct ref_lock *lock;
eca35a25 1348 int err, i = 0, ret = 0, flag = 0;
c0277d15 1349
68db31cc 1350 lock = lock_ref_sha1_basic(refname, sha1, 0, &flag);
c0277d15
JH
1351 if (!lock)
1352 return 1;
045a476f 1353 if (!(flag & REF_ISPACKED) || flag & REF_ISSYMREF) {
c0277d15 1354 /* loose */
eca35a25
MV
1355 const char *path;
1356
1357 if (!(delopt & REF_NODEREF)) {
1358 i = strlen(lock->lk->filename) - 5; /* .lock */
1359 lock->lk->filename[i] = 0;
1360 path = lock->lk->filename;
1361 } else {
9db56f71 1362 path = git_path("%s", refname);
eca35a25 1363 }
691f1a28
AR
1364 err = unlink_or_warn(path);
1365 if (err && errno != ENOENT)
c0277d15 1366 ret = 1;
691f1a28 1367
eca35a25
MV
1368 if (!(delopt & REF_NODEREF))
1369 lock->lk->filename[i] = '.';
c0277d15
JH
1370 }
1371 /* removing the loose one could have resurrected an earlier
1372 * packed one. Also, if it was not loose we need to repack
1373 * without it.
1374 */
1375 ret |= repack_without_ref(refname);
1376
691f1a28 1377 unlink_or_warn(git_path("logs/%s", lock->ref_name));
3870a0d1 1378 invalidate_ref_cache(NULL);
c0277d15
JH
1379 unlock_ref(lock);
1380 return ret;
4bd18c43
SP
1381}
1382
765c2258
PH
1383/*
1384 * People using contrib's git-new-workdir have .git/logs/refs ->
1385 * /some/other/path/.git/logs/refs, and that may live on another device.
1386 *
1387 * IOW, to avoid cross device rename errors, the temporary renamed log must
1388 * live into logs/refs.
1389 */
1390#define TMP_RENAMED_LOG "logs/refs/.tmp-renamed-log"
1391
dfefa935 1392int rename_ref(const char *oldrefname, const char *newrefname, const char *logmsg)
c976d415 1393{
c976d415
LH
1394 unsigned char sha1[20], orig_sha1[20];
1395 int flag = 0, logmoved = 0;
1396 struct ref_lock *lock;
c976d415 1397 struct stat loginfo;
dfefa935 1398 int log = !lstat(git_path("logs/%s", oldrefname), &loginfo);
eca35a25 1399 const char *symref = NULL;
316b097a 1400 struct ref_cache *refs = get_ref_cache(NULL);
c976d415 1401
450d4c0f 1402 if (log && S_ISLNK(loginfo.st_mode))
dfefa935 1403 return error("reflog for %s is a symlink", oldrefname);
c976d415 1404
8d68493f 1405 symref = resolve_ref_unsafe(oldrefname, orig_sha1, 1, &flag);
eca35a25 1406 if (flag & REF_ISSYMREF)
fa58186c 1407 return error("refname %s is a symbolic ref, renaming it is not supported",
dfefa935 1408 oldrefname);
eca35a25 1409 if (!symref)
dfefa935 1410 return error("refname %s not found", oldrefname);
c976d415 1411
316b097a 1412 if (!is_refname_available(newrefname, oldrefname, get_packed_refs(refs)))
c976d415
LH
1413 return 1;
1414
316b097a 1415 if (!is_refname_available(newrefname, oldrefname, get_loose_refs(refs)))
c976d415
LH
1416 return 1;
1417
dfefa935 1418 if (log && rename(git_path("logs/%s", oldrefname), git_path(TMP_RENAMED_LOG)))
765c2258 1419 return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
dfefa935 1420 oldrefname, strerror(errno));
c976d415 1421
dfefa935
MH
1422 if (delete_ref(oldrefname, orig_sha1, REF_NODEREF)) {
1423 error("unable to delete old %s", oldrefname);
c976d415
LH
1424 goto rollback;
1425 }
1426
dfefa935
MH
1427 if (!read_ref_full(newrefname, sha1, 1, &flag) &&
1428 delete_ref(newrefname, sha1, REF_NODEREF)) {
c976d415 1429 if (errno==EISDIR) {
dfefa935
MH
1430 if (remove_empty_directories(git_path("%s", newrefname))) {
1431 error("Directory not empty: %s", newrefname);
c976d415
LH
1432 goto rollback;
1433 }
1434 } else {
dfefa935 1435 error("unable to delete existing %s", newrefname);
c976d415
LH
1436 goto rollback;
1437 }
1438 }
1439
dfefa935
MH
1440 if (log && safe_create_leading_directories(git_path("logs/%s", newrefname))) {
1441 error("unable to create directory for %s", newrefname);
c976d415
LH
1442 goto rollback;
1443 }
1444
1445 retry:
dfefa935 1446 if (log && rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", newrefname))) {
d9e74d57
JR
1447 if (errno==EISDIR || errno==ENOTDIR) {
1448 /*
1449 * rename(a, b) when b is an existing
1450 * directory ought to result in ISDIR, but
1451 * Solaris 5.8 gives ENOTDIR. Sheesh.
1452 */
dfefa935
MH
1453 if (remove_empty_directories(git_path("logs/%s", newrefname))) {
1454 error("Directory not empty: logs/%s", newrefname);
c976d415
LH
1455 goto rollback;
1456 }
1457 goto retry;
1458 } else {
765c2258 1459 error("unable to move logfile "TMP_RENAMED_LOG" to logs/%s: %s",
dfefa935 1460 newrefname, strerror(errno));
c976d415
LH
1461 goto rollback;
1462 }
1463 }
1464 logmoved = log;
1465
dfefa935 1466 lock = lock_ref_sha1_basic(newrefname, NULL, 0, NULL);
c976d415 1467 if (!lock) {
dfefa935 1468 error("unable to lock %s for update", newrefname);
c976d415
LH
1469 goto rollback;
1470 }
c976d415
LH
1471 lock->force_write = 1;
1472 hashcpy(lock->old_sha1, orig_sha1);
678d0f4c 1473 if (write_ref_sha1(lock, orig_sha1, logmsg)) {
dfefa935 1474 error("unable to write current sha1 into %s", newrefname);
c976d415
LH
1475 goto rollback;
1476 }
1477
1478 return 0;
1479
1480 rollback:
dfefa935 1481 lock = lock_ref_sha1_basic(oldrefname, NULL, 0, NULL);
c976d415 1482 if (!lock) {
dfefa935 1483 error("unable to lock %s for rollback", oldrefname);
c976d415
LH
1484 goto rollbacklog;
1485 }
1486
1487 lock->force_write = 1;
1488 flag = log_all_ref_updates;
1489 log_all_ref_updates = 0;
1490 if (write_ref_sha1(lock, orig_sha1, NULL))
dfefa935 1491 error("unable to write current sha1 into %s", oldrefname);
c976d415
LH
1492 log_all_ref_updates = flag;
1493
1494 rollbacklog:
dfefa935 1495 if (logmoved && rename(git_path("logs/%s", newrefname), git_path("logs/%s", oldrefname)))
c976d415 1496 error("unable to restore logfile %s from %s: %s",
dfefa935 1497 oldrefname, newrefname, strerror(errno));
c976d415 1498 if (!logmoved && log &&
dfefa935 1499 rename(git_path(TMP_RENAMED_LOG), git_path("logs/%s", oldrefname)))
765c2258 1500 error("unable to restore logfile %s from "TMP_RENAMED_LOG": %s",
dfefa935 1501 oldrefname, strerror(errno));
c976d415
LH
1502
1503 return 1;
1504}
1505
435fc852 1506int close_ref(struct ref_lock *lock)
b531394d
BC
1507{
1508 if (close_lock_file(lock->lk))
1509 return -1;
1510 lock->lock_fd = -1;
1511 return 0;
1512}
1513
435fc852 1514int commit_ref(struct ref_lock *lock)
b531394d
BC
1515{
1516 if (commit_lock_file(lock->lk))
1517 return -1;
1518 lock->lock_fd = -1;
1519 return 0;
1520}
1521
e5f38ec3 1522void unlock_ref(struct ref_lock *lock)
4bd18c43 1523{
4ed7cd3a
BC
1524 /* Do not free lock->lk -- atexit() still looks at them */
1525 if (lock->lk)
1526 rollback_lock_file(lock->lk);
434cd0cd 1527 free(lock->ref_name);
1655707c 1528 free(lock->orig_ref_name);
4bd18c43
SP
1529 free(lock);
1530}
1531
0ec29a47
JH
1532/*
1533 * copy the reflog message msg to buf, which has been allocated sufficiently
1534 * large, while cleaning up the whitespaces. Especially, convert LF to space,
1535 * because reflog file is one line per entry.
1536 */
1537static int copy_msg(char *buf, const char *msg)
1538{
1539 char *cp = buf;
1540 char c;
1541 int wasspace = 1;
1542
1543 *cp++ = '\t';
1544 while ((c = *msg++)) {
1545 if (wasspace && isspace(c))
1546 continue;
1547 wasspace = isspace(c);
1548 if (wasspace)
1549 c = ' ';
1550 *cp++ = c;
1551 }
1552 while (buf < cp && isspace(cp[-1]))
1553 cp--;
1554 *cp++ = '\n';
1555 return cp - buf;
1556}
1557
dfefa935 1558int log_ref_setup(const char *refname, char *logfile, int bufsize)
6de08ae6 1559{
859c3017 1560 int logfd, oflags = O_APPEND | O_WRONLY;
9a13f0b7 1561
dfefa935 1562 git_snpath(logfile, bufsize, "logs/%s", refname);
4057deb5 1563 if (log_all_ref_updates &&
dfefa935
MH
1564 (!prefixcmp(refname, "refs/heads/") ||
1565 !prefixcmp(refname, "refs/remotes/") ||
1566 !prefixcmp(refname, "refs/notes/") ||
1567 !strcmp(refname, "HEAD"))) {
157aaea5 1568 if (safe_create_leading_directories(logfile) < 0)
6de08ae6 1569 return error("unable to create directory for %s",
157aaea5 1570 logfile);
6de08ae6
SP
1571 oflags |= O_CREAT;
1572 }
1573
157aaea5 1574 logfd = open(logfile, oflags, 0666);
6de08ae6 1575 if (logfd < 0) {
1974bf62 1576 if (!(oflags & O_CREAT) && errno == ENOENT)
6de08ae6 1577 return 0;
3b463c3f
JH
1578
1579 if ((oflags & O_CREAT) && errno == EISDIR) {
157aaea5 1580 if (remove_empty_directories(logfile)) {
3b463c3f 1581 return error("There are still logs under '%s'",
157aaea5 1582 logfile);
3b463c3f 1583 }
157aaea5 1584 logfd = open(logfile, oflags, 0666);
3b463c3f
JH
1585 }
1586
1587 if (logfd < 0)
1588 return error("Unable to append to %s: %s",
157aaea5 1589 logfile, strerror(errno));
6de08ae6
SP
1590 }
1591
157aaea5 1592 adjust_shared_perm(logfile);
859c3017
EM
1593 close(logfd);
1594 return 0;
1595}
443b92b6 1596
dfefa935 1597static int log_ref_write(const char *refname, const unsigned char *old_sha1,
859c3017
EM
1598 const unsigned char *new_sha1, const char *msg)
1599{
1600 int logfd, result, written, oflags = O_APPEND | O_WRONLY;
1601 unsigned maxlen, len;
1602 int msglen;
157aaea5 1603 char log_file[PATH_MAX];
859c3017
EM
1604 char *logrec;
1605 const char *committer;
1606
1607 if (log_all_ref_updates < 0)
1608 log_all_ref_updates = !is_bare_repository();
1609
dfefa935 1610 result = log_ref_setup(refname, log_file, sizeof(log_file));
859c3017
EM
1611 if (result)
1612 return result;
1613
1614 logfd = open(log_file, oflags);
1615 if (logfd < 0)
1616 return 0;
0ec29a47 1617 msglen = msg ? strlen(msg) : 0;
774751a8 1618 committer = git_committer_info(0);
8ac65937
JH
1619 maxlen = strlen(committer) + msglen + 100;
1620 logrec = xmalloc(maxlen);
1621 len = sprintf(logrec, "%s %s %s\n",
9a13f0b7
NP
1622 sha1_to_hex(old_sha1),
1623 sha1_to_hex(new_sha1),
8ac65937
JH
1624 committer);
1625 if (msglen)
0ec29a47 1626 len += copy_msg(logrec + len - 1, msg) - 1;
93822c22 1627 written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
6de08ae6 1628 free(logrec);
91c8d590 1629 if (close(logfd) != 0 || written != len)
9a13f0b7 1630 return error("Unable to append to %s", log_file);
6de08ae6
SP
1631 return 0;
1632}
1633
c3b0dec5
LT
1634static int is_branch(const char *refname)
1635{
1636 return !strcmp(refname, "HEAD") || !prefixcmp(refname, "refs/heads/");
1637}
1638
4bd18c43
SP
1639int write_ref_sha1(struct ref_lock *lock,
1640 const unsigned char *sha1, const char *logmsg)
1641{
1642 static char term = '\n';
c3b0dec5 1643 struct object *o;
4bd18c43
SP
1644
1645 if (!lock)
95fc7512 1646 return -1;
a89fccd2 1647 if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
4bd18c43
SP
1648 unlock_ref(lock);
1649 return 0;
95fc7512 1650 }
c3b0dec5
LT
1651 o = parse_object(sha1);
1652 if (!o) {
7be8b3ba 1653 error("Trying to write ref %s with nonexistent object %s",
c3b0dec5
LT
1654 lock->ref_name, sha1_to_hex(sha1));
1655 unlock_ref(lock);
1656 return -1;
1657 }
1658 if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
1659 error("Trying to write non-commit object %s to branch %s",
1660 sha1_to_hex(sha1), lock->ref_name);
1661 unlock_ref(lock);
1662 return -1;
1663 }
93822c22
AW
1664 if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
1665 write_in_full(lock->lock_fd, &term, 1) != 1
b531394d 1666 || close_ref(lock) < 0) {
c33d5174 1667 error("Couldn't write %s", lock->lk->filename);
4bd18c43
SP
1668 unlock_ref(lock);
1669 return -1;
1670 }
8bf90dc9 1671 clear_loose_ref_cache(get_ref_cache(NULL));
bd104db1
NP
1672 if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
1673 (strcmp(lock->ref_name, lock->orig_ref_name) &&
1674 log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
6de08ae6
SP
1675 unlock_ref(lock);
1676 return -1;
1677 }
605fac8b
NP
1678 if (strcmp(lock->orig_ref_name, "HEAD") != 0) {
1679 /*
1680 * Special hack: If a branch is updated directly and HEAD
1681 * points to it (may happen on the remote side of a push
1682 * for example) then logically the HEAD reflog should be
1683 * updated too.
1684 * A generic solution implies reverse symref information,
1685 * but finding all symrefs pointing to the given branch
1686 * would be rather costly for this rare event (the direct
1687 * update of a branch) to be worth it. So let's cheat and
1688 * check with HEAD only which should cover 99% of all usage
1689 * scenarios (even 100% of the default ones).
1690 */
1691 unsigned char head_sha1[20];
1692 int head_flag;
1693 const char *head_ref;
8cad4744 1694 head_ref = resolve_ref_unsafe("HEAD", head_sha1, 1, &head_flag);
605fac8b
NP
1695 if (head_ref && (head_flag & REF_ISSYMREF) &&
1696 !strcmp(head_ref, lock->ref_name))
1697 log_ref_write("HEAD", lock->old_sha1, sha1, logmsg);
1698 }
b531394d 1699 if (commit_ref(lock)) {
434cd0cd 1700 error("Couldn't set %s", lock->ref_name);
4bd18c43
SP
1701 unlock_ref(lock);
1702 return -1;
1703 }
4bd18c43
SP
1704 unlock_ref(lock);
1705 return 0;
95fc7512 1706}
d556fae2 1707
8b5157e4
NP
1708int create_symref(const char *ref_target, const char *refs_heads_master,
1709 const char *logmsg)
41b625b0
NP
1710{
1711 const char *lockpath;
1712 char ref[1000];
1713 int fd, len, written;
a4f34cbb 1714 char *git_HEAD = git_pathdup("%s", ref_target);
8b5157e4
NP
1715 unsigned char old_sha1[20], new_sha1[20];
1716
1717 if (logmsg && read_ref(ref_target, old_sha1))
1718 hashclr(old_sha1);
41b625b0 1719
d48744d1
JH
1720 if (safe_create_leading_directories(git_HEAD) < 0)
1721 return error("unable to create directory for %s", git_HEAD);
1722
41b625b0
NP
1723#ifndef NO_SYMLINK_HEAD
1724 if (prefer_symlink_refs) {
1725 unlink(git_HEAD);
1726 if (!symlink(refs_heads_master, git_HEAD))
8b5157e4 1727 goto done;
41b625b0
NP
1728 fprintf(stderr, "no symlink - falling back to symbolic ref\n");
1729 }
1730#endif
1731
1732 len = snprintf(ref, sizeof(ref), "ref: %s\n", refs_heads_master);
1733 if (sizeof(ref) <= len) {
1734 error("refname too long: %s", refs_heads_master);
47fc52e2 1735 goto error_free_return;
41b625b0
NP
1736 }
1737 lockpath = mkpath("%s.lock", git_HEAD);
1738 fd = open(lockpath, O_CREAT | O_EXCL | O_WRONLY, 0666);
1739 if (fd < 0) {
1740 error("Unable to open %s for writing", lockpath);
47fc52e2 1741 goto error_free_return;
41b625b0
NP
1742 }
1743 written = write_in_full(fd, ref, len);
91c8d590 1744 if (close(fd) != 0 || written != len) {
41b625b0 1745 error("Unable to write to %s", lockpath);
47fc52e2 1746 goto error_unlink_return;
41b625b0
NP
1747 }
1748 if (rename(lockpath, git_HEAD) < 0) {
41b625b0 1749 error("Unable to create %s", git_HEAD);
47fc52e2 1750 goto error_unlink_return;
41b625b0
NP
1751 }
1752 if (adjust_shared_perm(git_HEAD)) {
41b625b0 1753 error("Unable to fix permissions on %s", lockpath);
47fc52e2 1754 error_unlink_return:
691f1a28 1755 unlink_or_warn(lockpath);
47fc52e2
JH
1756 error_free_return:
1757 free(git_HEAD);
1758 return -1;
41b625b0 1759 }
8b5157e4 1760
ee96d11b 1761#ifndef NO_SYMLINK_HEAD
8b5157e4 1762 done:
ee96d11b 1763#endif
8b5157e4
NP
1764 if (logmsg && !read_ref(refs_heads_master, new_sha1))
1765 log_ref_write(ref_target, old_sha1, new_sha1, logmsg);
1766
47fc52e2 1767 free(git_HEAD);
41b625b0
NP
1768 return 0;
1769}
1770
16d7cc90
JH
1771static char *ref_msg(const char *line, const char *endp)
1772{
1773 const char *ep;
16d7cc90 1774 line += 82;
182af834
PH
1775 ep = memchr(line, '\n', endp - line);
1776 if (!ep)
1777 ep = endp;
1778 return xmemdupz(line, ep - line);
16d7cc90
JH
1779}
1780
dfefa935
MH
1781int read_ref_at(const char *refname, unsigned long at_time, int cnt,
1782 unsigned char *sha1, char **msg,
1783 unsigned long *cutoff_time, int *cutoff_tz, int *cutoff_cnt)
d556fae2 1784{
e5229042 1785 const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
d556fae2 1786 char *tz_c;
e29cb53a 1787 int logfd, tz, reccnt = 0;
d556fae2
SP
1788 struct stat st;
1789 unsigned long date;
e5229042 1790 unsigned char logged_sha1[20];
cb48cb58 1791 void *log_mapped;
dc49cd76 1792 size_t mapsz;
d556fae2 1793
dfefa935 1794 logfile = git_path("logs/%s", refname);
d556fae2
SP
1795 logfd = open(logfile, O_RDONLY, 0);
1796 if (logfd < 0)
d824cbba 1797 die_errno("Unable to read log '%s'", logfile);
d556fae2
SP
1798 fstat(logfd, &st);
1799 if (!st.st_size)
1800 die("Log %s is empty.", logfile);
dc49cd76
SP
1801 mapsz = xsize_t(st.st_size);
1802 log_mapped = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, logfd, 0);
cb48cb58 1803 logdata = log_mapped;
d556fae2
SP
1804 close(logfd);
1805
e5229042 1806 lastrec = NULL;
d556fae2
SP
1807 rec = logend = logdata + st.st_size;
1808 while (logdata < rec) {
e29cb53a 1809 reccnt++;
d556fae2
SP
1810 if (logdata < rec && *(rec-1) == '\n')
1811 rec--;
e5229042
SP
1812 lastgt = NULL;
1813 while (logdata < rec && *(rec-1) != '\n') {
d556fae2 1814 rec--;
e5229042
SP
1815 if (*rec == '>')
1816 lastgt = rec;
1817 }
1818 if (!lastgt)
d556fae2 1819 die("Log %s is corrupt.", logfile);
e5229042 1820 date = strtoul(lastgt + 1, &tz_c, 10);
ab2a1a32 1821 if (date <= at_time || cnt == 0) {
76a44c5c 1822 tz = strtoul(tz_c, NULL, 10);
16d7cc90
JH
1823 if (msg)
1824 *msg = ref_msg(rec, logend);
1825 if (cutoff_time)
1826 *cutoff_time = date;
1827 if (cutoff_tz)
1828 *cutoff_tz = tz;
1829 if (cutoff_cnt)
76a44c5c 1830 *cutoff_cnt = reccnt - 1;
e5229042
SP
1831 if (lastrec) {
1832 if (get_sha1_hex(lastrec, logged_sha1))
1833 die("Log %s is corrupt.", logfile);
1834 if (get_sha1_hex(rec + 41, sha1))
1835 die("Log %s is corrupt.", logfile);
a89fccd2 1836 if (hashcmp(logged_sha1, sha1)) {
edbc25c5 1837 warning("Log %s has gap after %s.",
73013afd 1838 logfile, show_date(date, tz, DATE_RFC2822));
e5229042 1839 }
e5f38ec3
JH
1840 }
1841 else if (date == at_time) {
e5229042
SP
1842 if (get_sha1_hex(rec + 41, sha1))
1843 die("Log %s is corrupt.", logfile);
e5f38ec3
JH
1844 }
1845 else {
e5229042
SP
1846 if (get_sha1_hex(rec + 41, logged_sha1))
1847 die("Log %s is corrupt.", logfile);
a89fccd2 1848 if (hashcmp(logged_sha1, sha1)) {
edbc25c5 1849 warning("Log %s unexpectedly ended on %s.",
73013afd 1850 logfile, show_date(date, tz, DATE_RFC2822));
e5229042
SP
1851 }
1852 }
dc49cd76 1853 munmap(log_mapped, mapsz);
d556fae2
SP
1854 return 0;
1855 }
e5229042 1856 lastrec = rec;
ab2a1a32
JH
1857 if (cnt > 0)
1858 cnt--;
d556fae2
SP
1859 }
1860
e5229042
SP
1861 rec = logdata;
1862 while (rec < logend && *rec != '>' && *rec != '\n')
1863 rec++;
1864 if (rec == logend || *rec == '\n')
d556fae2 1865 die("Log %s is corrupt.", logfile);
e5229042 1866 date = strtoul(rec + 1, &tz_c, 10);
d556fae2
SP
1867 tz = strtoul(tz_c, NULL, 10);
1868 if (get_sha1_hex(logdata, sha1))
1869 die("Log %s is corrupt.", logfile);
d1a4489a
JK
1870 if (is_null_sha1(sha1)) {
1871 if (get_sha1_hex(logdata + 41, sha1))
1872 die("Log %s is corrupt.", logfile);
1873 }
16d7cc90
JH
1874 if (msg)
1875 *msg = ref_msg(logdata, logend);
dc49cd76 1876 munmap(log_mapped, mapsz);
16d7cc90
JH
1877
1878 if (cutoff_time)
1879 *cutoff_time = date;
1880 if (cutoff_tz)
1881 *cutoff_tz = tz;
1882 if (cutoff_cnt)
1883 *cutoff_cnt = reccnt;
1884 return 1;
d556fae2 1885}
2ff81662 1886
dfefa935 1887int for_each_recent_reflog_ent(const char *refname, each_reflog_ent_fn fn, long ofs, void *cb_data)
2ff81662
JH
1888{
1889 const char *logfile;
1890 FILE *logfp;
8ca78803 1891 struct strbuf sb = STRBUF_INIT;
2266bf27 1892 int ret = 0;
2ff81662 1893
dfefa935 1894 logfile = git_path("logs/%s", refname);
2ff81662
JH
1895 logfp = fopen(logfile, "r");
1896 if (!logfp)
883d60fa 1897 return -1;
101d15e0
JH
1898
1899 if (ofs) {
1900 struct stat statbuf;
1901 if (fstat(fileno(logfp), &statbuf) ||
1902 statbuf.st_size < ofs ||
1903 fseek(logfp, -ofs, SEEK_END) ||
8ca78803 1904 strbuf_getwholeline(&sb, logfp, '\n')) {
9d33f7c2 1905 fclose(logfp);
8ca78803 1906 strbuf_release(&sb);
101d15e0 1907 return -1;
9d33f7c2 1908 }
101d15e0
JH
1909 }
1910
8ca78803 1911 while (!strbuf_getwholeline(&sb, logfp, '\n')) {
2ff81662 1912 unsigned char osha1[20], nsha1[20];
883d60fa
JS
1913 char *email_end, *message;
1914 unsigned long timestamp;
8ca78803 1915 int tz;
2ff81662
JH
1916
1917 /* old SP new SP name <email> SP time TAB msg LF */
8ca78803
RS
1918 if (sb.len < 83 || sb.buf[sb.len - 1] != '\n' ||
1919 get_sha1_hex(sb.buf, osha1) || sb.buf[40] != ' ' ||
1920 get_sha1_hex(sb.buf + 41, nsha1) || sb.buf[81] != ' ' ||
1921 !(email_end = strchr(sb.buf + 82, '>')) ||
883d60fa
JS
1922 email_end[1] != ' ' ||
1923 !(timestamp = strtoul(email_end + 2, &message, 10)) ||
1924 !message || message[0] != ' ' ||
1925 (message[1] != '+' && message[1] != '-') ||
1926 !isdigit(message[2]) || !isdigit(message[3]) ||
b4dd4856 1927 !isdigit(message[4]) || !isdigit(message[5]))
2ff81662 1928 continue; /* corrupt? */
883d60fa
JS
1929 email_end[1] = '\0';
1930 tz = strtol(message + 1, NULL, 10);
b4dd4856
JS
1931 if (message[6] != '\t')
1932 message += 6;
1933 else
1934 message += 7;
8ca78803
RS
1935 ret = fn(osha1, nsha1, sb.buf + 82, timestamp, tz, message,
1936 cb_data);
883d60fa 1937 if (ret)
2266bf27 1938 break;
2ff81662
JH
1939 }
1940 fclose(logfp);
8ca78803 1941 strbuf_release(&sb);
2266bf27 1942 return ret;
2ff81662 1943}
e29cb53a 1944
dfefa935 1945int for_each_reflog_ent(const char *refname, each_reflog_ent_fn fn, void *cb_data)
101d15e0 1946{
dfefa935 1947 return for_each_recent_reflog_ent(refname, fn, 0, cb_data);
101d15e0
JH
1948}
1949
eb8381c8
NP
1950static int do_for_each_reflog(const char *base, each_ref_fn fn, void *cb_data)
1951{
1952 DIR *dir = opendir(git_path("logs/%s", base));
fcee5a14 1953 int retval = 0;
eb8381c8
NP
1954
1955 if (dir) {
1956 struct dirent *de;
1957 int baselen = strlen(base);
1958 char *log = xmalloc(baselen + 257);
1959
1960 memcpy(log, base, baselen);
1961 if (baselen && base[baselen-1] != '/')
1962 log[baselen++] = '/';
1963
1964 while ((de = readdir(dir)) != NULL) {
1965 struct stat st;
1966 int namelen;
1967
1968 if (de->d_name[0] == '.')
1969 continue;
1970 namelen = strlen(de->d_name);
1971 if (namelen > 255)
1972 continue;
1973 if (has_extension(de->d_name, ".lock"))
1974 continue;
1975 memcpy(log + baselen, de->d_name, namelen+1);
1976 if (stat(git_path("logs/%s", log), &st) < 0)
1977 continue;
1978 if (S_ISDIR(st.st_mode)) {
1979 retval = do_for_each_reflog(log, fn, cb_data);
1980 } else {
1981 unsigned char sha1[20];
c6893323 1982 if (read_ref_full(log, sha1, 0, NULL))
eb8381c8
NP
1983 retval = error("bad ref for %s", log);
1984 else
1985 retval = fn(log, sha1, 0, cb_data);
1986 }
1987 if (retval)
1988 break;
1989 }
1990 free(log);
1991 closedir(dir);
1992 }
acb39f64 1993 else if (*base)
fcee5a14 1994 return errno;
eb8381c8
NP
1995 return retval;
1996}
1997
1998int for_each_reflog(each_ref_fn fn, void *cb_data)
1999{
2000 return do_for_each_reflog("", fn, cb_data);
2001}
3d9f037c
CR
2002
2003int update_ref(const char *action, const char *refname,
2004 const unsigned char *sha1, const unsigned char *oldval,
2005 int flags, enum action_on_err onerr)
2006{
2007 static struct ref_lock *lock;
2008 lock = lock_any_ref_for_update(refname, oldval, flags);
2009 if (!lock) {
2010 const char *str = "Cannot lock the ref '%s'.";
2011 switch (onerr) {
2012 case MSG_ON_ERR: error(str, refname); break;
2013 case DIE_ON_ERR: die(str, refname); break;
2014 case QUIET_ON_ERR: break;
2015 }
2016 return 1;
2017 }
2018 if (write_ref_sha1(lock, sha1, action) < 0) {
2019 const char *str = "Cannot update the ref '%s'.";
2020 switch (onerr) {
2021 case MSG_ON_ERR: error(str, refname); break;
2022 case DIE_ON_ERR: die(str, refname); break;
2023 case QUIET_ON_ERR: break;
2024 }
2025 return 1;
2026 }
2027 return 0;
2028}
cda69f48 2029
5483f799 2030struct ref *find_ref_by_name(const struct ref *list, const char *name)
cda69f48
JK
2031{
2032 for ( ; list; list = list->next)
2033 if (!strcmp(list->name, name))
5483f799 2034 return (struct ref *)list;
cda69f48
JK
2035 return NULL;
2036}
7c2b3029
JK
2037
2038/*
2039 * generate a format suitable for scanf from a ref_rev_parse_rules
2040 * rule, that is replace the "%.*s" spec with a "%s" spec
2041 */
2042static void gen_scanf_fmt(char *scanf_fmt, const char *rule)
2043{
2044 char *spec;
2045
2046 spec = strstr(rule, "%.*s");
2047 if (!spec || strstr(spec + 4, "%.*s"))
2048 die("invalid rule in ref_rev_parse_rules: %s", rule);
2049
2050 /* copy all until spec */
2051 strncpy(scanf_fmt, rule, spec - rule);
2052 scanf_fmt[spec - rule] = '\0';
2053 /* copy new spec */
2054 strcat(scanf_fmt, "%s");
2055 /* copy remaining rule */
2056 strcat(scanf_fmt, spec + 4);
2057
2058 return;
2059}
2060
dfefa935 2061char *shorten_unambiguous_ref(const char *refname, int strict)
7c2b3029
JK
2062{
2063 int i;
2064 static char **scanf_fmts;
2065 static int nr_rules;
2066 char *short_name;
2067
2068 /* pre generate scanf formats from ref_rev_parse_rules[] */
2069 if (!nr_rules) {
2070 size_t total_len = 0;
2071
2072 /* the rule list is NULL terminated, count them first */
2073 for (; ref_rev_parse_rules[nr_rules]; nr_rules++)
2074 /* no +1 because strlen("%s") < strlen("%.*s") */
2075 total_len += strlen(ref_rev_parse_rules[nr_rules]);
2076
2077 scanf_fmts = xmalloc(nr_rules * sizeof(char *) + total_len);
2078
2079 total_len = 0;
2080 for (i = 0; i < nr_rules; i++) {
2081 scanf_fmts[i] = (char *)&scanf_fmts[nr_rules]
2082 + total_len;
2083 gen_scanf_fmt(scanf_fmts[i], ref_rev_parse_rules[i]);
2084 total_len += strlen(ref_rev_parse_rules[i]);
2085 }
2086 }
2087
2088 /* bail out if there are no rules */
2089 if (!nr_rules)
dfefa935 2090 return xstrdup(refname);
7c2b3029 2091
dfefa935
MH
2092 /* buffer for scanf result, at most refname must fit */
2093 short_name = xstrdup(refname);
7c2b3029
JK
2094
2095 /* skip first rule, it will always match */
2096 for (i = nr_rules - 1; i > 0 ; --i) {
2097 int j;
6e7b3309 2098 int rules_to_fail = i;
7c2b3029
JK
2099 int short_name_len;
2100
dfefa935 2101 if (1 != sscanf(refname, scanf_fmts[i], short_name))
7c2b3029
JK
2102 continue;
2103
2104 short_name_len = strlen(short_name);
2105
6e7b3309
BW
2106 /*
2107 * in strict mode, all (except the matched one) rules
2108 * must fail to resolve to a valid non-ambiguous ref
2109 */
2110 if (strict)
2111 rules_to_fail = nr_rules;
2112
7c2b3029
JK
2113 /*
2114 * check if the short name resolves to a valid ref,
2115 * but use only rules prior to the matched one
2116 */
6e7b3309 2117 for (j = 0; j < rules_to_fail; j++) {
7c2b3029 2118 const char *rule = ref_rev_parse_rules[j];
7c2b3029
JK
2119 char refname[PATH_MAX];
2120
6e7b3309
BW
2121 /* skip matched rule */
2122 if (i == j)
2123 continue;
2124
7c2b3029
JK
2125 /*
2126 * the short name is ambiguous, if it resolves
2127 * (with this previous rule) to a valid ref
2128 * read_ref() returns 0 on success
2129 */
2130 mksnpath(refname, sizeof(refname),
2131 rule, short_name_len, short_name);
c6893323 2132 if (ref_exists(refname))
7c2b3029
JK
2133 break;
2134 }
2135
2136 /*
2137 * short name is non-ambiguous if all previous rules
2138 * haven't resolved to a valid ref
2139 */
6e7b3309 2140 if (j == rules_to_fail)
7c2b3029
JK
2141 return short_name;
2142 }
2143
2144 free(short_name);
dfefa935 2145 return xstrdup(refname);
7c2b3029 2146}