read_branches_file: simplify string handling
[git/git.git] / remote.c
CommitLineData
5751f490
DB
1#include "cache.h"
2#include "remote.h"
3#include "refs.h"
6d21bf96
JH
4#include "commit.h"
5#include "diff.h"
6#include "revision.h"
8ca12c0d 7#include "dir.h"
ec8452d5 8#include "tag.h"
73cf0822 9#include "string-list.h"
ed81c76b 10#include "mergesort.h"
5751f490 11
6ddba5e2
FC
12enum map_direction { FROM_SRC, FROM_DST };
13
e0aaa29f
DB
14static struct refspec s_tag_refspec = {
15 0,
16 1,
b84c343c 17 0,
6e7b66ee 18 0,
08fbdb30
DB
19 "refs/tags/*",
20 "refs/tags/*"
e0aaa29f
DB
21};
22
23const struct refspec *tag_refspec = &s_tag_refspec;
24
844112ca
JH
25struct counted_string {
26 size_t len;
27 const char *s;
28};
55029ae4
DB
29struct rewrite {
30 const char *base;
844112ca
JH
31 size_t baselen;
32 struct counted_string *instead_of;
55029ae4
DB
33 int instead_of_nr;
34 int instead_of_alloc;
35};
d071d942
JT
36struct rewrites {
37 struct rewrite **rewrite;
38 int rewrite_alloc;
39 int rewrite_nr;
40};
55029ae4 41
5751f490 42static struct remote **remotes;
2d31347b
DB
43static int remotes_alloc;
44static int remotes_nr;
d0da003d 45static struct hashmap remotes_hash;
5751f490 46
cf818348 47static struct branch **branches;
2d31347b
DB
48static int branches_alloc;
49static int branches_nr;
cf818348
DB
50
51static struct branch *current_branch;
f24f715e 52static const char *pushremote_name;
cf818348 53
d071d942 54static struct rewrites rewrites;
1c2eafb8 55static struct rewrites rewrites_push;
55029ae4 56
5751f490
DB
57#define BUF_SIZE (2048)
58static char buffer[BUF_SIZE];
59
0a4da29d
DB
60static int valid_remote(const struct remote *remote)
61{
c578f51d 62 return (!!remote->url) || (!!remote->foreign_vcs);
0a4da29d
DB
63}
64
d071d942 65static const char *alias_url(const char *url, struct rewrites *r)
55029ae4
DB
66{
67 int i, j;
844112ca
JH
68 struct counted_string *longest;
69 int longest_i;
70
71 longest = NULL;
72 longest_i = -1;
d071d942
JT
73 for (i = 0; i < r->rewrite_nr; i++) {
74 if (!r->rewrite[i])
55029ae4 75 continue;
d071d942 76 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
59556548 77 if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
844112ca 78 (!longest ||
d071d942
JT
79 longest->len < r->rewrite[i]->instead_of[j].len)) {
80 longest = &(r->rewrite[i]->instead_of[j]);
844112ca 81 longest_i = i;
55029ae4
DB
82 }
83 }
84 }
844112ca
JH
85 if (!longest)
86 return url;
87
75faa45a 88 return xstrfmt("%s%s", r->rewrite[longest_i]->base, url + longest->len);
55029ae4
DB
89}
90
5751f490
DB
91static void add_push_refspec(struct remote *remote, const char *ref)
92{
2d31347b
DB
93 ALLOC_GROW(remote->push_refspec,
94 remote->push_refspec_nr + 1,
95 remote->push_refspec_alloc);
96 remote->push_refspec[remote->push_refspec_nr++] = ref;
5751f490
DB
97}
98
5d46c9d4
DB
99static void add_fetch_refspec(struct remote *remote, const char *ref)
100{
2d31347b
DB
101 ALLOC_GROW(remote->fetch_refspec,
102 remote->fetch_refspec_nr + 1,
103 remote->fetch_refspec_alloc);
104 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
5d46c9d4
DB
105}
106
28b91f8a 107static void add_url(struct remote *remote, const char *url)
5751f490 108{
2d31347b
DB
109 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
110 remote->url[remote->url_nr++] = url;
5751f490
DB
111}
112
20346234
MG
113static void add_pushurl(struct remote *remote, const char *pushurl)
114{
115 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
116 remote->pushurl[remote->pushurl_nr++] = pushurl;
117}
118
1c2eafb8
JT
119static void add_pushurl_alias(struct remote *remote, const char *url)
120{
121 const char *pushurl = alias_url(url, &rewrites_push);
122 if (pushurl != url)
123 add_pushurl(remote, pushurl);
124}
125
126static void add_url_alias(struct remote *remote, const char *url)
127{
128 add_url(remote, alias_url(url, &rewrites));
129 add_pushurl_alias(remote, url);
130}
131
d0da003d
PR
132struct remotes_hash_key {
133 const char *str;
134 int len;
135};
136
137static int remotes_hash_cmp(const struct remote *a, const struct remote *b, const struct remotes_hash_key *key)
138{
139 if (key)
140 return strncmp(a->name, key->str, key->len) || a->name[key->len];
141 else
142 return strcmp(a->name, b->name);
143}
144
145static inline void init_remotes_hash(void)
146{
147 if (!remotes_hash.cmpfn)
148 hashmap_init(&remotes_hash, (hashmap_cmp_fn)remotes_hash_cmp, 0);
149}
150
5751f490
DB
151static struct remote *make_remote(const char *name, int len)
152{
d0da003d
PR
153 struct remote *ret, *replaced;
154 struct remotes_hash_key lookup;
155 struct hashmap_entry lookup_entry;
5751f490 156
d0da003d
PR
157 if (!len)
158 len = strlen(name);
159
160 init_remotes_hash();
161 lookup.str = name;
162 lookup.len = len;
163 hashmap_entry_init(&lookup_entry, memhash(name, len));
164
165 if ((ret = hashmap_get(&remotes_hash, &lookup_entry, &lookup)) != NULL)
166 return ret;
5751f490 167
2d31347b 168 ret = xcalloc(1, sizeof(struct remote));
737c5a9c 169 ret->prune = -1; /* unspecified */
2d31347b
DB
170 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
171 remotes[remotes_nr++] = ret;
d0da003d
PR
172 ret->name = xstrndup(name, len);
173
174 hashmap_entry_init(ret, lookup_entry.hash);
175 replaced = hashmap_put(&remotes_hash, ret);
176 assert(replaced == NULL); /* no previous entry overwritten */
2d31347b 177 return ret;
5751f490
DB
178}
179
cf818348
DB
180static void add_merge(struct branch *branch, const char *name)
181{
2d31347b
DB
182 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
183 branch->merge_alloc);
184 branch->merge_name[branch->merge_nr++] = name;
cf818348
DB
185}
186
187static struct branch *make_branch(const char *name, int len)
188{
2d31347b
DB
189 struct branch *ret;
190 int i;
cf818348 191
2d31347b
DB
192 for (i = 0; i < branches_nr; i++) {
193 if (len ? (!strncmp(name, branches[i]->name, len) &&
194 !branches[i]->name[len]) :
195 !strcmp(name, branches[i]->name))
196 return branches[i];
cf818348
DB
197 }
198
2d31347b
DB
199 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
200 ret = xcalloc(1, sizeof(struct branch));
201 branches[branches_nr++] = ret;
cf818348 202 if (len)
2d31347b 203 ret->name = xstrndup(name, len);
cf818348 204 else
2d31347b 205 ret->name = xstrdup(name);
fa3f60b7 206 ret->refname = xstrfmt("refs/heads/%s", ret->name);
cf818348 207
2d31347b 208 return ret;
cf818348
DB
209}
210
d071d942 211static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
55029ae4
DB
212{
213 struct rewrite *ret;
214 int i;
215
d071d942 216 for (i = 0; i < r->rewrite_nr; i++) {
844112ca 217 if (len
d071d942
JT
218 ? (len == r->rewrite[i]->baselen &&
219 !strncmp(base, r->rewrite[i]->base, len))
220 : !strcmp(base, r->rewrite[i]->base))
221 return r->rewrite[i];
55029ae4
DB
222 }
223
d071d942 224 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
55029ae4 225 ret = xcalloc(1, sizeof(struct rewrite));
d071d942 226 r->rewrite[r->rewrite_nr++] = ret;
844112ca 227 if (len) {
55029ae4 228 ret->base = xstrndup(base, len);
844112ca
JH
229 ret->baselen = len;
230 }
231 else {
55029ae4 232 ret->base = xstrdup(base);
844112ca
JH
233 ret->baselen = strlen(base);
234 }
55029ae4
DB
235 return ret;
236}
237
238static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
239{
240 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
844112ca
JH
241 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
242 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
243 rewrite->instead_of_nr++;
55029ae4
DB
244}
245
5751f490
DB
246static void read_remotes_file(struct remote *remote)
247{
248 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
249
250 if (!f)
251 return;
89cf4c70 252 remote->origin = REMOTE_REMOTES;
5751f490
DB
253 while (fgets(buffer, BUF_SIZE, f)) {
254 int value_list;
255 char *s, *p;
256
59556548 257 if (starts_with(buffer, "URL:")) {
5751f490
DB
258 value_list = 0;
259 s = buffer + 4;
59556548 260 } else if (starts_with(buffer, "Push:")) {
5751f490
DB
261 value_list = 1;
262 s = buffer + 5;
59556548 263 } else if (starts_with(buffer, "Pull:")) {
5d46c9d4
DB
264 value_list = 2;
265 s = buffer + 5;
5751f490
DB
266 } else
267 continue;
268
269 while (isspace(*s))
270 s++;
271 if (!*s)
272 continue;
273
274 p = s + strlen(s);
275 while (isspace(p[-1]))
276 *--p = 0;
277
278 switch (value_list) {
279 case 0:
55029ae4 280 add_url_alias(remote, xstrdup(s));
5751f490
DB
281 break;
282 case 1:
283 add_push_refspec(remote, xstrdup(s));
284 break;
5d46c9d4
DB
285 case 2:
286 add_fetch_refspec(remote, xstrdup(s));
287 break;
5751f490
DB
288 }
289 }
290 fclose(f);
291}
292
293static void read_branches_file(struct remote *remote)
294{
cf818348 295 char *frag;
f28e3ab2
JK
296 struct strbuf buf = STRBUF_INIT;
297 FILE *f = fopen(git_path("branches/%s", remote->name), "r");
5751f490
DB
298
299 if (!f)
300 return;
f28e3ab2
JK
301
302 strbuf_getline(&buf, f, '\n');
303 strbuf_trim(&buf);
304 if (!buf.len) {
305 strbuf_release(&buf);
5751f490 306 return;
f28e3ab2
JK
307 }
308
89cf4c70 309 remote->origin = REMOTE_BRANCHES;
472fa4cd
DB
310
311 /*
55cfde25 312 * The branches file would have URL and optionally
472fa4cd 313 * #branch specified. The "master" (or specified) branch is
f28e3ab2
JK
314 * fetched and stored in the local branch matching the
315 * remote name.
472fa4cd 316 */
f28e3ab2
JK
317 frag = strchr(buf.buf, '#');
318 if (frag)
cf818348 319 *(frag++) = '\0';
f28e3ab2
JK
320 else
321 frag = "master";
322
323 add_url_alias(remote, strbuf_detach(&buf, NULL));
324 add_fetch_refspec(remote, xstrfmt("refs/heads/%s:refs/heads/%s",
325 frag, remote->name));
55cfde25 326
18afe101
MK
327 /*
328 * Cogito compatible push: push current HEAD to remote #branch
329 * (master if missing)
330 */
f28e3ab2 331 add_push_refspec(remote, xstrfmt("HEAD:refs/heads/%s", frag));
d71ab174 332 remote->fetch_tags = 1; /* always auto-follow */
5751f490
DB
333}
334
ef90d6d4 335static int handle_config(const char *key, const char *value, void *cb)
5751f490
DB
336{
337 const char *name;
338 const char *subkey;
339 struct remote *remote;
cf818348 340 struct branch *branch;
59556548 341 if (starts_with(key, "branch.")) {
cf818348
DB
342 name = key + 7;
343 subkey = strrchr(name, '.');
cf818348
DB
344 if (!subkey)
345 return 0;
896c0535 346 branch = make_branch(name, subkey - name);
cf818348 347 if (!strcmp(subkey, ".remote")) {
e41bf352 348 return git_config_string(&branch->remote_name, key, value);
9f765ce6 349 } else if (!strcmp(subkey, ".pushremote")) {
da66b274 350 return git_config_string(&branch->pushremote_name, key, value);
d2370cc2
JH
351 } else if (!strcmp(subkey, ".merge")) {
352 if (!value)
353 return config_error_nonbool(key);
cf818348 354 add_merge(branch, xstrdup(value));
d2370cc2 355 }
cf818348 356 return 0;
5751f490 357 }
59556548 358 if (starts_with(key, "url.")) {
55029ae4 359 struct rewrite *rewrite;
60e3aba9 360 name = key + 4;
55029ae4
DB
361 subkey = strrchr(name, '.');
362 if (!subkey)
363 return 0;
55029ae4 364 if (!strcmp(subkey, ".insteadof")) {
1c2eafb8
JT
365 rewrite = make_rewrite(&rewrites, name, subkey - name);
366 if (!value)
367 return config_error_nonbool(key);
368 add_instead_of(rewrite, xstrdup(value));
369 } else if (!strcmp(subkey, ".pushinsteadof")) {
370 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
55029ae4
DB
371 if (!value)
372 return config_error_nonbool(key);
373 add_instead_of(rewrite, xstrdup(value));
374 }
375 }
224c2171 376
59556548 377 if (!starts_with(key, "remote."))
5751f490
DB
378 return 0;
379 name = key + 7;
224c2171
RR
380
381 /* Handle remote.* variables */
382 if (!strcmp(name, "pushdefault"))
383 return git_config_string(&pushremote_name, key, value);
384
385 /* Handle remote.<name>.* variables */
c82efafc
BC
386 if (*name == '/') {
387 warning("Config remote shorthand cannot begin with '/': %s",
388 name);
389 return 0;
390 }
5751f490
DB
391 subkey = strrchr(name, '.');
392 if (!subkey)
cd294bc3 393 return 0;
5751f490 394 remote = make_remote(name, subkey - name);
89cf4c70 395 remote->origin = REMOTE_CONFIG;
84bb2dfd
PB
396 if (!strcmp(subkey, ".mirror"))
397 remote->mirror = git_config_bool(key, value);
398 else if (!strcmp(subkey, ".skipdefaultupdate"))
399 remote->skip_default_update = git_config_bool(key, value);
7cc91a2f
BG
400 else if (!strcmp(subkey, ".skipfetchall"))
401 remote->skip_default_update = git_config_bool(key, value);
737c5a9c
MS
402 else if (!strcmp(subkey, ".prune"))
403 remote->prune = git_config_bool(key, value);
84bb2dfd
PB
404 else if (!strcmp(subkey, ".url")) {
405 const char *v;
406 if (git_config_string(&v, key, value))
407 return -1;
408 add_url(remote, v);
20346234
MG
409 } else if (!strcmp(subkey, ".pushurl")) {
410 const char *v;
411 if (git_config_string(&v, key, value))
412 return -1;
413 add_pushurl(remote, v);
5751f490 414 } else if (!strcmp(subkey, ".push")) {
84bb2dfd
PB
415 const char *v;
416 if (git_config_string(&v, key, value))
417 return -1;
418 add_push_refspec(remote, v);
5d46c9d4 419 } else if (!strcmp(subkey, ".fetch")) {
84bb2dfd
PB
420 const char *v;
421 if (git_config_string(&v, key, value))
422 return -1;
423 add_fetch_refspec(remote, v);
5751f490 424 } else if (!strcmp(subkey, ".receivepack")) {
84bb2dfd
PB
425 const char *v;
426 if (git_config_string(&v, key, value))
427 return -1;
5751f490 428 if (!remote->receivepack)
84bb2dfd 429 remote->receivepack = v;
5751f490
DB
430 else
431 error("more than one receivepack given, using the first");
0012ba21 432 } else if (!strcmp(subkey, ".uploadpack")) {
84bb2dfd
PB
433 const char *v;
434 if (git_config_string(&v, key, value))
435 return -1;
0012ba21 436 if (!remote->uploadpack)
84bb2dfd 437 remote->uploadpack = v;
0012ba21
DB
438 else
439 error("more than one uploadpack given, using the first");
d71ab174
DB
440 } else if (!strcmp(subkey, ".tagopt")) {
441 if (!strcmp(value, "--no-tags"))
442 remote->fetch_tags = -1;
944163a4
ST
443 else if (!strcmp(value, "--tags"))
444 remote->fetch_tags = 2;
14c98218 445 } else if (!strcmp(subkey, ".proxy")) {
84bb2dfd
PB
446 return git_config_string((const char **)&remote->http_proxy,
447 key, value);
c578f51d
DB
448 } else if (!strcmp(subkey, ".vcs")) {
449 return git_config_string(&remote->foreign_vcs, key, value);
84bb2dfd 450 }
5751f490
DB
451 return 0;
452}
453
55029ae4
DB
454static void alias_all_urls(void)
455{
456 int i, j;
457 for (i = 0; i < remotes_nr; i++) {
1c2eafb8 458 int add_pushurl_aliases;
55029ae4
DB
459 if (!remotes[i])
460 continue;
20346234 461 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
d071d942 462 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
20346234 463 }
1c2eafb8
JT
464 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
465 for (j = 0; j < remotes[i]->url_nr; j++) {
466 if (add_pushurl_aliases)
467 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
468 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
469 }
55029ae4
DB
470 }
471}
472
5751f490
DB
473static void read_config(void)
474{
e41bf352 475 static int loaded;
5751f490
DB
476 unsigned char sha1[20];
477 const char *head_ref;
478 int flag;
e41bf352
JK
479
480 if (loaded)
5751f490 481 return;
e41bf352
JK
482 loaded = 1;
483
5751f490 484 current_branch = NULL;
7695d118 485 head_ref = resolve_ref_unsafe("HEAD", 0, sha1, &flag);
5751f490 486 if (head_ref && (flag & REF_ISSYMREF) &&
95b567c7
JK
487 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
488 current_branch = make_branch(head_ref, 0);
5751f490 489 }
ef90d6d4 490 git_config(handle_config, NULL);
55029ae4 491 alias_all_urls();
5751f490
DB
492}
493
2cb1f36d
BC
494/*
495 * This function frees a refspec array.
496 * Warning: code paths should be checked to ensure that the src
497 * and dst pointers are always freeable pointers as well
498 * as the refspec pointer itself.
499 */
697d7f5d 500static void free_refspecs(struct refspec *refspec, int nr_refspec)
2cb1f36d
BC
501{
502 int i;
503
504 if (!refspec)
505 return;
506
507 for (i = 0; i < nr_refspec; i++) {
508 free(refspec[i].src);
509 free(refspec[i].dst);
510 }
511 free(refspec);
512}
513
24b6177e 514static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
6b62816c
DB
515{
516 int i;
da7a478b 517 struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
46220ca1 518
6b62816c 519 for (i = 0; i < nr_refspec; i++) {
47c6ef1c 520 size_t llen;
46220ca1
JH
521 int is_glob;
522 const char *lhs, *rhs;
8d9c5010 523 int flags;
46220ca1 524
8e76bf3f 525 is_glob = 0;
46220ca1
JH
526
527 lhs = refspec[i];
528 if (*lhs == '+') {
6b62816c 529 rs[i].force = 1;
46220ca1 530 lhs++;
6b62816c 531 }
46220ca1
JH
532
533 rhs = strrchr(lhs, ':');
a83619d6
PB
534
535 /*
536 * Before going on, special case ":" (or "+:") as a refspec
def24991 537 * for pushing matching refs.
a83619d6
PB
538 */
539 if (!fetch && rhs == lhs && rhs[1] == '\0') {
540 rs[i].matching = 1;
541 continue;
542 }
543
46220ca1 544 if (rhs) {
47c6ef1c 545 size_t rlen = strlen(++rhs);
abd2bde7 546 is_glob = (1 <= rlen && strchr(rhs, '*'));
08fbdb30 547 rs[i].dst = xstrndup(rhs, rlen);
6b62816c 548 }
ef00d150 549
46220ca1 550 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
abd2bde7 551 if (1 <= llen && memchr(lhs, '*', llen)) {
7d19da46
JH
552 if ((rhs && !is_glob) || (!rhs && fetch))
553 goto invalid;
554 is_glob = 1;
7d19da46
JH
555 } else if (rhs && is_glob) {
556 goto invalid;
ef00d150 557 }
7d19da46 558
46220ca1
JH
559 rs[i].pattern = is_glob;
560 rs[i].src = xstrndup(lhs, llen);
8d9c5010 561 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
46220ca1
JH
562
563 if (fetch) {
6e7b66ee
JH
564 unsigned char unused[40];
565
def24991 566 /* LHS */
46220ca1 567 if (!*rs[i].src)
def24991 568 ; /* empty is ok; it means "HEAD" */
6e7b66ee
JH
569 else if (llen == 40 && !get_sha1_hex(rs[i].src, unused))
570 rs[i].exact_sha1 = 1; /* ok */
def24991
JH
571 else if (!check_refname_format(rs[i].src, flags))
572 ; /* valid looking ref is ok */
573 else
8d9c5010 574 goto invalid;
def24991 575 /* RHS */
8d9c5010 576 if (!rs[i].dst)
def24991 577 ; /* missing is ok; it is the same as empty */
8d9c5010 578 else if (!*rs[i].dst)
def24991
JH
579 ; /* empty is ok; it means "do not store" */
580 else if (!check_refname_format(rs[i].dst, flags))
581 ; /* valid looking ref is ok */
582 else
8d9c5010 583 goto invalid;
46220ca1
JH
584 } else {
585 /*
586 * LHS
587 * - empty is allowed; it means delete.
588 * - when wildcarded, it must be a valid looking ref.
589 * - otherwise, it must be an extended SHA-1, but
590 * there is no existing way to validate this.
591 */
592 if (!*rs[i].src)
593 ; /* empty is ok */
594 else if (is_glob) {
8d9c5010 595 if (check_refname_format(rs[i].src, flags))
46220ca1
JH
596 goto invalid;
597 }
598 else
599 ; /* anything goes, for now */
600 /*
601 * RHS
602 * - missing is allowed, but LHS then must be a
603 * valid looking ref.
604 * - empty is not allowed.
605 * - otherwise it must be a valid looking ref.
606 */
607 if (!rs[i].dst) {
8d9c5010 608 if (check_refname_format(rs[i].src, flags))
46220ca1
JH
609 goto invalid;
610 } else if (!*rs[i].dst) {
611 goto invalid;
612 } else {
8d9c5010 613 if (check_refname_format(rs[i].dst, flags))
46220ca1
JH
614 goto invalid;
615 }
ef00d150 616 }
6b62816c
DB
617 }
618 return rs;
46220ca1
JH
619
620 invalid:
24b6177e 621 if (verify) {
2cb1f36d
BC
622 /*
623 * nr_refspec must be greater than zero and i must be valid
624 * since it is only possible to reach this point from within
625 * the for loop above.
626 */
627 free_refspecs(rs, i+1);
24b6177e
JF
628 return NULL;
629 }
46220ca1
JH
630 die("Invalid refspec '%s'", refspec[i]);
631}
632
24b6177e
JF
633int valid_fetch_refspec(const char *fetch_refspec_str)
634{
24b6177e
JF
635 struct refspec *refspec;
636
66dbfd55 637 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
2cb1f36d 638 free_refspecs(refspec, 1);
24b6177e
JF
639 return !!refspec;
640}
641
46220ca1
JH
642struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
643{
24b6177e 644 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
46220ca1
JH
645}
646
697d7f5d 647static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
46220ca1 648{
24b6177e 649 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
6b62816c
DB
650}
651
72ff8943
DB
652void free_refspec(int nr_refspec, struct refspec *refspec)
653{
654 int i;
655 for (i = 0; i < nr_refspec; i++) {
656 free(refspec[i].src);
657 free(refspec[i].dst);
658 }
659 free(refspec);
660}
661
df93e33c
DB
662static int valid_remote_nick(const char *name)
663{
8ca12c0d 664 if (!name[0] || is_dot_or_dotdot(name))
df93e33c
DB
665 return 0;
666 return !strchr(name, '/'); /* no slash */
667}
668
f052154d
JK
669const char *remote_for_branch(struct branch *branch, int *explicit)
670{
671 if (branch && branch->remote_name) {
672 if (explicit)
673 *explicit = 1;
674 return branch->remote_name;
675 }
676 if (explicit)
677 *explicit = 0;
678 return "origin";
679}
680
da66b274
JK
681const char *pushremote_for_branch(struct branch *branch, int *explicit)
682{
683 if (branch && branch->pushremote_name) {
684 if (explicit)
685 *explicit = 1;
686 return branch->pushremote_name;
687 }
688 if (pushremote_name) {
689 if (explicit)
690 *explicit = 1;
691 return pushremote_name;
692 }
693 return remote_for_branch(branch, explicit);
694}
695
696static struct remote *remote_get_1(const char *name,
697 const char *(*get_default)(struct branch *, int *))
5751f490
DB
698{
699 struct remote *ret;
fa685bdf 700 int name_given = 0;
5751f490 701
8770e6fb
JK
702 read_config();
703
fa685bdf
DB
704 if (name)
705 name_given = 1;
da66b274
JK
706 else
707 name = get_default(current_branch, &name_given);
9326d494 708
5751f490 709 ret = make_remote(name, 0);
df93e33c 710 if (valid_remote_nick(name)) {
0a4da29d 711 if (!valid_remote(ret))
5751f490 712 read_remotes_file(ret);
0a4da29d 713 if (!valid_remote(ret))
5751f490
DB
714 read_branches_file(ret);
715 }
0a4da29d 716 if (name_given && !valid_remote(ret))
55029ae4 717 add_url_alias(ret, name);
0a4da29d 718 if (!valid_remote(ret))
5751f490 719 return NULL;
46220ca1
JH
720 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
721 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
5751f490
DB
722 return ret;
723}
6b62816c 724
f24f715e
RR
725struct remote *remote_get(const char *name)
726{
da66b274 727 return remote_get_1(name, remote_for_branch);
f24f715e
RR
728}
729
730struct remote *pushremote_get(const char *name)
731{
da66b274 732 return remote_get_1(name, pushremote_for_branch);
f24f715e
RR
733}
734
9a23ba33
FAG
735int remote_is_configured(const char *name)
736{
d0da003d
PR
737 struct remotes_hash_key lookup;
738 struct hashmap_entry lookup_entry;
9a23ba33
FAG
739 read_config();
740
d0da003d
PR
741 init_remotes_hash();
742 lookup.str = name;
743 lookup.len = strlen(name);
744 hashmap_entry_init(&lookup_entry, memhash(name, lookup.len));
745
746 return hashmap_get(&remotes_hash, &lookup_entry, &lookup) != NULL;
9a23ba33
FAG
747}
748
b42f6927
JS
749int for_each_remote(each_remote_fn fn, void *priv)
750{
751 int i, result = 0;
752 read_config();
2d31347b 753 for (i = 0; i < remotes_nr && !result; i++) {
b42f6927
JS
754 struct remote *r = remotes[i];
755 if (!r)
756 continue;
757 if (!r->fetch)
46220ca1
JH
758 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
759 r->fetch_refspec);
b42f6927 760 if (!r->push)
46220ca1
JH
761 r->push = parse_push_refspec(r->push_refspec_nr,
762 r->push_refspec);
b42f6927
JS
763 result = fn(r, priv);
764 }
765 return result;
766}
767
df02ebda
MH
768static void handle_duplicate(struct ref *ref1, struct ref *ref2)
769{
f096e6e8
MH
770 if (strcmp(ref1->name, ref2->name)) {
771 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
772 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
773 die(_("Cannot fetch both %s and %s to %s"),
774 ref1->name, ref2->name, ref2->peer_ref->name);
775 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
776 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
777 warning(_("%s usually tracks %s, not %s"),
778 ref2->peer_ref->name, ref2->name, ref1->name);
779 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
780 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
781 die(_("%s tracks both %s and %s"),
782 ref2->peer_ref->name, ref1->name, ref2->name);
783 } else {
784 /*
785 * This last possibility doesn't occur because
786 * FETCH_HEAD_IGNORE entries always appear at
787 * the end of the list.
788 */
789 die(_("Internal error"));
790 }
791 }
df02ebda
MH
792 free(ref2->peer_ref);
793 free(ref2);
794}
795
b9afe665 796struct ref *ref_remove_duplicates(struct ref *ref_map)
2467a4fa 797{
183113a5 798 struct string_list refs = STRING_LIST_INIT_NODUP;
b9afe665
MH
799 struct ref *retval = NULL;
800 struct ref **p = &retval;
73cf0822 801
b9afe665
MH
802 while (ref_map) {
803 struct ref *ref = ref_map;
804
805 ref_map = ref_map->next;
806 ref->next = NULL;
73cf0822 807
b9afe665
MH
808 if (!ref->peer_ref) {
809 *p = ref;
810 p = &ref->next;
09ea1f8e 811 } else {
b9afe665
MH
812 struct string_list_item *item =
813 string_list_insert(&refs, ref->peer_ref->name);
814
815 if (item->util) {
816 /* Entry already existed */
df02ebda 817 handle_duplicate((struct ref *)item->util, ref);
b9afe665
MH
818 } else {
819 *p = ref;
820 p = &ref->next;
821 item->util = ref;
822 }
2467a4fa
DB
823 }
824 }
b9afe665 825
73cf0822 826 string_list_clear(&refs, 0);
b9afe665 827 return retval;
2467a4fa
DB
828}
829
28b91f8a 830int remote_has_url(struct remote *remote, const char *url)
5d46c9d4
DB
831{
832 int i;
28b91f8a
SP
833 for (i = 0; i < remote->url_nr; i++) {
834 if (!strcmp(remote->url[i], url))
5d46c9d4
DB
835 return 1;
836 }
837 return 0;
838}
839
e928213f
DB
840static int match_name_with_pattern(const char *key, const char *name,
841 const char *value, char **result)
a3c84239 842{
08fbdb30
DB
843 const char *kstar = strchr(key, '*');
844 size_t klen;
abd2bde7
DB
845 size_t ksuffixlen;
846 size_t namelen;
08fbdb30
DB
847 int ret;
848 if (!kstar)
849 die("Key '%s' of pattern had no '*'", key);
850 klen = kstar - key;
abd2bde7
DB
851 ksuffixlen = strlen(kstar + 1);
852 namelen = strlen(name);
853 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
854 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
e928213f 855 if (ret && value) {
07bfa575 856 struct strbuf sb = STRBUF_INIT;
08fbdb30 857 const char *vstar = strchr(value, '*');
08fbdb30
DB
858 if (!vstar)
859 die("Value '%s' of pattern has no '*'", value);
07bfa575
RS
860 strbuf_add(&sb, value, vstar - value);
861 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
862 strbuf_addstr(&sb, vstar + 1);
863 *result = strbuf_detach(&sb, NULL);
e928213f 864 }
a3c84239
DB
865 return ret;
866}
867
e6f63712
CMN
868static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
869{
870 int i;
871 int find_src = !query->src;
872
873 if (find_src && !query->dst)
874 error("query_refspecs_multiple: need either src or dst");
875
876 for (i = 0; i < ref_count; i++) {
877 struct refspec *refspec = &refs[i];
878 const char *key = find_src ? refspec->dst : refspec->src;
879 const char *value = find_src ? refspec->src : refspec->dst;
880 const char *needle = find_src ? query->dst : query->src;
881 char **result = find_src ? &query->src : &query->dst;
882
883 if (!refspec->dst)
884 continue;
885 if (refspec->pattern) {
886 if (match_name_with_pattern(key, needle, value, result))
887 string_list_append_nodup(results, *result);
888 } else if (!strcmp(needle, key)) {
889 string_list_append(results, value);
890 }
891 }
892}
893
ca02465b 894int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
72ff8943
DB
895{
896 int i;
c500352e 897 int find_src = !query->src;
049bff8f
MH
898 const char *needle = find_src ? query->dst : query->src;
899 char **result = find_src ? &query->src : &query->dst;
72ff8943 900
c500352e
CMN
901 if (find_src && !query->dst)
902 return error("query_refspecs: need either src or dst");
b42f6927 903
c500352e
CMN
904 for (i = 0; i < ref_count; i++) {
905 struct refspec *refspec = &refs[i];
906 const char *key = find_src ? refspec->dst : refspec->src;
907 const char *value = find_src ? refspec->src : refspec->dst;
b42f6927 908
c500352e 909 if (!refspec->dst)
5d46c9d4 910 continue;
c500352e 911 if (refspec->pattern) {
e928213f 912 if (match_name_with_pattern(key, needle, value, result)) {
c500352e 913 query->force = refspec->force;
5d46c9d4
DB
914 return 0;
915 }
b42f6927
JS
916 } else if (!strcmp(needle, key)) {
917 *result = xstrdup(value);
c500352e 918 query->force = refspec->force;
b42f6927 919 return 0;
5d46c9d4
DB
920 }
921 }
5d46c9d4
DB
922 return -1;
923}
924
c500352e
CMN
925char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
926 const char *name)
927{
928 struct refspec query;
929
930 memset(&query, 0, sizeof(struct refspec));
931 query.src = (char *)name;
932
933 if (query_refspecs(refspecs, nr_refspec, &query))
934 return NULL;
935
936 return query.dst;
937}
938
939int remote_find_tracking(struct remote *remote, struct refspec *refspec)
940{
941 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
942}
943
8009768e
RS
944static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
945 const char *name)
946{
947 size_t len = strlen(name);
948 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
949 memcpy(ref->name, prefix, prefixlen);
950 memcpy(ref->name + prefixlen, name, len);
951 return ref;
952}
953
59c69c0c 954struct ref *alloc_ref(const char *name)
dfd255dd 955{
59c69c0c 956 return alloc_ref_with_prefix("", 0, name);
737922aa
KK
957}
958
59a57757 959struct ref *copy_ref(const struct ref *ref)
d71ab174 960{
7b3db095
JS
961 struct ref *cpy;
962 size_t len;
963 if (!ref)
964 return NULL;
965 len = strlen(ref->name);
966 cpy = xmalloc(sizeof(struct ref) + len + 1);
967 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
968 cpy->next = NULL;
8c53f071
JK
969 cpy->symref = xstrdup_or_null(ref->symref);
970 cpy->remote_status = xstrdup_or_null(ref->remote_status);
7b3db095
JS
971 cpy->peer_ref = copy_ref(ref->peer_ref);
972 return cpy;
d71ab174
DB
973}
974
4577370e
DB
975struct ref *copy_ref_list(const struct ref *ref)
976{
977 struct ref *ret = NULL;
978 struct ref **tail = &ret;
979 while (ref) {
980 *tail = copy_ref(ref);
981 ref = ref->next;
982 tail = &((*tail)->next);
983 }
984 return ret;
985}
986
697d7f5d 987static void free_ref(struct ref *ref)
be885d96
DB
988{
989 if (!ref)
990 return;
7b3db095 991 free_ref(ref->peer_ref);
be885d96
DB
992 free(ref->remote_status);
993 free(ref->symref);
994 free(ref);
995}
996
dfd255dd
DB
997void free_refs(struct ref *ref)
998{
999 struct ref *next;
1000 while (ref) {
1001 next = ref->next;
be885d96 1002 free_ref(ref);
dfd255dd
DB
1003 ref = next;
1004 }
1005}
1006
ed81c76b
JK
1007int ref_compare_name(const void *va, const void *vb)
1008{
1009 const struct ref *a = va, *b = vb;
1010 return strcmp(a->name, b->name);
1011}
1012
1013static void *ref_list_get_next(const void *a)
1014{
1015 return ((const struct ref *)a)->next;
1016}
1017
1018static void ref_list_set_next(void *a, void *next)
1019{
1020 ((struct ref *)a)->next = next;
1021}
1022
1023void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
1024{
1025 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
1026}
1027
ca02465b
JH
1028int count_refspec_match(const char *pattern,
1029 struct ref *refs,
1030 struct ref **matched_ref)
6b62816c
DB
1031{
1032 int patlen = strlen(pattern);
1033 struct ref *matched_weak = NULL;
1034 struct ref *matched = NULL;
1035 int weak_match = 0;
1036 int match = 0;
1037
1038 for (weak_match = match = 0; refs; refs = refs->next) {
1039 char *name = refs->name;
1040 int namelen = strlen(name);
6b62816c 1041
54457fe5 1042 if (!refname_match(pattern, name))
6b62816c
DB
1043 continue;
1044
1045 /* A match is "weak" if it is with refs outside
1046 * heads or tags, and did not specify the pattern
1047 * in full (e.g. "refs/remotes/origin/master") or at
1048 * least from the toplevel (e.g. "remotes/origin/master");
1049 * otherwise "git push $URL master" would result in
1050 * ambiguity between remotes/origin/master and heads/master
1051 * at the remote site.
1052 */
1053 if (namelen != patlen &&
1054 patlen != namelen - 5 &&
59556548
CC
1055 !starts_with(name, "refs/heads/") &&
1056 !starts_with(name, "refs/tags/")) {
6b62816c
DB
1057 /* We want to catch the case where only weak
1058 * matches are found and there are multiple
1059 * matches, and where more than one strong
1060 * matches are found, as ambiguous. One
1061 * strong match with zero or more weak matches
1062 * are acceptable as a unique match.
1063 */
1064 matched_weak = refs;
1065 weak_match++;
1066 }
1067 else {
1068 matched = refs;
1069 match++;
1070 }
1071 }
1072 if (!matched) {
471fd3fe
JK
1073 if (matched_ref)
1074 *matched_ref = matched_weak;
6b62816c
DB
1075 return weak_match;
1076 }
1077 else {
471fd3fe
JK
1078 if (matched_ref)
1079 *matched_ref = matched;
6b62816c
DB
1080 return match;
1081 }
1082}
1083
1d735267 1084static void tail_link_ref(struct ref *ref, struct ref ***tail)
6b62816c
DB
1085{
1086 **tail = ref;
1d735267
DB
1087 while (ref->next)
1088 ref = ref->next;
6b62816c 1089 *tail = &ref->next;
6b62816c
DB
1090}
1091
67655246
FC
1092static struct ref *alloc_delete_ref(void)
1093{
1094 struct ref *ref = alloc_ref("(delete)");
1095 hashclr(ref->new_sha1);
1096 return ref;
1097}
1098
471fd3fe
JK
1099static int try_explicit_object_name(const char *name,
1100 struct ref **match)
6b62816c
DB
1101{
1102 unsigned char sha1[20];
6b62816c 1103
471fd3fe
JK
1104 if (!*name) {
1105 if (match)
1106 *match = alloc_delete_ref();
1107 return 0;
1108 }
1109
6b62816c 1110 if (get_sha1(name, sha1))
471fd3fe
JK
1111 return -1;
1112
1113 if (match) {
1114 *match = alloc_ref(name);
1115 hashcpy((*match)->new_sha1, sha1);
1116 }
1117 return 0;
6b62816c
DB
1118}
1119
1d735267 1120static struct ref *make_linked_ref(const char *name, struct ref ***tail)
6b62816c 1121{
59c69c0c 1122 struct ref *ret = alloc_ref(name);
1d735267
DB
1123 tail_link_ref(ret, tail);
1124 return ret;
163f0ee5 1125}
8558fd9e 1126
f8aae120
JK
1127static char *guess_ref(const char *name, struct ref *peer)
1128{
1129 struct strbuf buf = STRBUF_INIT;
1130 unsigned char sha1[20];
1131
7695d118
RS
1132 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1133 sha1, NULL);
f8aae120
JK
1134 if (!r)
1135 return NULL;
1136
59556548 1137 if (starts_with(r, "refs/heads/"))
f8aae120 1138 strbuf_addstr(&buf, "refs/heads/");
59556548 1139 else if (starts_with(r, "refs/tags/"))
f8aae120
JK
1140 strbuf_addstr(&buf, "refs/tags/");
1141 else
1142 return NULL;
1143
1144 strbuf_addstr(&buf, name);
1145 return strbuf_detach(&buf, NULL);
1146}
1147
f7ade3d3
JK
1148static int match_explicit_lhs(struct ref *src,
1149 struct refspec *rs,
1150 struct ref **match,
1151 int *allocated_match)
1152{
1153 switch (count_refspec_match(rs->src, src, match)) {
1154 case 1:
471fd3fe
JK
1155 if (allocated_match)
1156 *allocated_match = 0;
f7ade3d3
JK
1157 return 0;
1158 case 0:
1159 /* The source could be in the get_sha1() format
1160 * not a reference name. :refs/other is a
1161 * way to delete 'other' ref at the remote end.
1162 */
471fd3fe 1163 if (try_explicit_object_name(rs->src, match) < 0)
f7ade3d3 1164 return error("src refspec %s does not match any.", rs->src);
471fd3fe
JK
1165 if (allocated_match)
1166 *allocated_match = 1;
f7ade3d3
JK
1167 return 0;
1168 default:
1169 return error("src refspec %s matches more than one.", rs->src);
1170 }
1171}
1172
54a8ad92
JH
1173static int match_explicit(struct ref *src, struct ref *dst,
1174 struct ref ***dst_tail,
9a7bbd1d 1175 struct refspec *rs)
6b62816c 1176{
54a8ad92 1177 struct ref *matched_src, *matched_dst;
f7ade3d3 1178 int allocated_src;
8558fd9e 1179
54a8ad92 1180 const char *dst_value = rs->dst;
f8aae120 1181 char *dst_guess;
6b62816c 1182
a83619d6 1183 if (rs->pattern || rs->matching)
9a7bbd1d 1184 return 0;
8558fd9e 1185
54a8ad92 1186 matched_src = matched_dst = NULL;
f7ade3d3
JK
1187 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1188 return -1;
3c8b7df1 1189
4491e62a 1190 if (!dst_value) {
9f0ea7e8
DB
1191 unsigned char sha1[20];
1192 int flag;
1193
7695d118
RS
1194 dst_value = resolve_ref_unsafe(matched_src->name,
1195 RESOLVE_REF_READING,
1196 sha1, &flag);
9f0ea7e8
DB
1197 if (!dst_value ||
1198 ((flag & REF_ISSYMREF) &&
59556548 1199 !starts_with(dst_value, "refs/heads/")))
9f0ea7e8
DB
1200 die("%s cannot be resolved to branch.",
1201 matched_src->name);
4491e62a 1202 }
3c8b7df1 1203
54a8ad92
JH
1204 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1205 case 1:
1206 break;
1207 case 0:
50e19a83 1208 if (starts_with(dst_value, "refs/"))
1d735267 1209 matched_dst = make_linked_ref(dst_value, dst_tail);
5742c82b
JK
1210 else if (is_null_sha1(matched_src->new_sha1))
1211 error("unable to delete '%s': remote ref does not exist",
1212 dst_value);
eeefa7c9 1213 else if ((dst_guess = guess_ref(dst_value, matched_src)))
f8aae120 1214 matched_dst = make_linked_ref(dst_guess, dst_tail);
3c8b7df1 1215 else
f8aae120
JK
1216 error("unable to push to unqualified destination: %s\n"
1217 "The destination refspec neither matches an "
1218 "existing ref on the remote nor\n"
1219 "begins with refs/, and we are unable to "
1220 "guess a prefix based on the source ref.",
1221 dst_value);
54a8ad92
JH
1222 break;
1223 default:
3c8b7df1 1224 matched_dst = NULL;
54a8ad92
JH
1225 error("dst refspec %s matches more than one.",
1226 dst_value);
1227 break;
1228 }
9a7bbd1d
JK
1229 if (!matched_dst)
1230 return -1;
1231 if (matched_dst->peer_ref)
1232 return error("dst ref %s receives from more than one src.",
54a8ad92 1233 matched_dst->name);
54a8ad92 1234 else {
f7ade3d3
JK
1235 matched_dst->peer_ref = allocated_src ?
1236 matched_src :
1237 copy_ref(matched_src);
54a8ad92 1238 matched_dst->force = rs->force;
6b62816c 1239 }
9a7bbd1d 1240 return 0;
54a8ad92
JH
1241}
1242
1243static int match_explicit_refs(struct ref *src, struct ref *dst,
1244 struct ref ***dst_tail, struct refspec *rs,
1245 int rs_nr)
1246{
1247 int i, errs;
1248 for (i = errs = 0; i < rs_nr; i++)
9a7bbd1d
JK
1249 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1250 return errs;
6b62816c
DB
1251}
1252
db70a04c 1253static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
6ddba5e2 1254 int send_mirror, int direction, const struct refspec **ret_pat)
8558fd9e 1255{
db70a04c
FC
1256 const struct refspec *pat;
1257 char *name;
8558fd9e 1258 int i;
a83619d6 1259 int matching_refs = -1;
8558fd9e 1260 for (i = 0; i < rs_nr; i++) {
a83619d6
PB
1261 if (rs[i].matching &&
1262 (matching_refs == -1 || rs[i].force)) {
1263 matching_refs = i;
1264 continue;
1265 }
1266
db70a04c
FC
1267 if (rs[i].pattern) {
1268 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
6ddba5e2
FC
1269 int match;
1270 if (direction == FROM_SRC)
1271 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1272 else
1273 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1274 if (match) {
db70a04c
FC
1275 matching_refs = i;
1276 break;
1277 }
1278 }
8558fd9e 1279 }
db70a04c 1280 if (matching_refs == -1)
a83619d6 1281 return NULL;
db70a04c
FC
1282
1283 pat = rs + matching_refs;
1284 if (pat->matching) {
1285 /*
1286 * "matching refs"; traditionally we pushed everything
1287 * including refs outside refs/heads/ hierarchy, but
1288 * that does not make much sense these days.
1289 */
59556548 1290 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
db70a04c
FC
1291 return NULL;
1292 name = xstrdup(ref->name);
1293 }
1294 if (ret_pat)
1295 *ret_pat = pat;
1296 return name;
8558fd9e
DB
1297}
1298
6d2bf96e
CB
1299static struct ref **tail_ref(struct ref **head)
1300{
1301 struct ref **tail = head;
1302 while (*tail)
1303 tail = &((*tail)->next);
1304 return tail;
1305}
1306
c2aba155
JH
1307struct tips {
1308 struct commit **tip;
1309 int nr, alloc;
1310};
1311
1312static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1313{
1314 struct commit *commit;
1315
1316 if (is_null_sha1(sha1))
1317 return;
1318 commit = lookup_commit_reference_gently(sha1, 1);
1319 if (!commit || (commit->object.flags & TMP_MARK))
1320 return;
1321 commit->object.flags |= TMP_MARK;
1322 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1323 tips->tip[tips->nr++] = commit;
1324}
1325
1326static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1327{
1328 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1329 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1330 struct string_list_item *item;
1331 struct ref *ref;
1332 struct tips sent_tips;
1333
1334 /*
1335 * Collect everything we know they would have at the end of
1336 * this push, and collect all tags they have.
1337 */
1338 memset(&sent_tips, 0, sizeof(sent_tips));
1339 for (ref = *dst; ref; ref = ref->next) {
1340 if (ref->peer_ref &&
1341 !is_null_sha1(ref->peer_ref->new_sha1))
1342 add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1343 else
1344 add_to_tips(&sent_tips, ref->old_sha1);
59556548 1345 if (starts_with(ref->name, "refs/tags/"))
c2aba155
JH
1346 string_list_append(&dst_tag, ref->name);
1347 }
1348 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1349
3383e199 1350 string_list_sort(&dst_tag);
c2aba155
JH
1351
1352 /* Collect tags they do not have. */
1353 for (ref = src; ref; ref = ref->next) {
59556548 1354 if (!starts_with(ref->name, "refs/tags/"))
c2aba155
JH
1355 continue; /* not a tag */
1356 if (string_list_has_string(&dst_tag, ref->name))
1357 continue; /* they already have it */
1358 if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1359 continue; /* be conservative */
1360 item = string_list_append(&src_tag, ref->name);
1361 item->util = ref;
1362 }
1363 string_list_clear(&dst_tag, 0);
1364
1365 /*
1366 * At this point, src_tag lists tags that are missing from
1367 * dst, and sent_tips lists the tips we are pushing or those
1368 * that we know they already have. An element in the src_tag
1369 * that is an ancestor of any of the sent_tips needs to be
1370 * sent to the other side.
1371 */
1372 if (sent_tips.nr) {
1373 for_each_string_list_item(item, &src_tag) {
1374 struct ref *ref = item->util;
1375 struct ref *dst_ref;
1376 struct commit *commit;
1377
1378 if (is_null_sha1(ref->new_sha1))
1379 continue;
1380 commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1381 if (!commit)
1382 /* not pushing a commit, which is not an error */
1383 continue;
1384
1385 /*
1386 * Is this tag, which they do not have, reachable from
1387 * any of the commits we are sending?
1388 */
1389 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1390 continue;
1391
1392 /* Add it in */
1393 dst_ref = make_linked_ref(ref->name, dst_tail);
1394 hashcpy(dst_ref->new_sha1, ref->new_sha1);
1395 dst_ref->peer_ref = copy_ref(ref);
1396 }
1397 }
1398 string_list_clear(&src_tag, 0);
1399 free(sent_tips.tip);
1400}
1401
47a59185
JH
1402struct ref *find_ref_by_name(const struct ref *list, const char *name)
1403{
1404 for ( ; list; list = list->next)
1405 if (!strcmp(list->name, name))
1406 return (struct ref *)list;
1407 return NULL;
1408}
1409
f1bd15ab
BC
1410static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1411{
1412 for ( ; ref; ref = ref->next)
1413 string_list_append_nodup(ref_index, ref->name)->util = ref;
1414
3383e199 1415 string_list_sort(ref_index);
f1bd15ab
BC
1416}
1417
ba928c13
JK
1418/*
1419 * Given only the set of local refs, sanity-check the set of push
1420 * refspecs. We can't catch all errors that match_push_refs would,
1421 * but we can catch some errors early before even talking to the
1422 * remote side.
1423 */
1424int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1425{
1426 struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1427 int ret = 0;
1428 int i;
1429
1430 for (i = 0; i < nr_refspec; i++) {
1431 struct refspec *rs = refspec + i;
1432
1433 if (rs->pattern || rs->matching)
1434 continue;
1435
1436 ret |= match_explicit_lhs(src, rs, NULL, NULL);
1437 }
1438
1439 free_refspec(nr_refspec, refspec);
1440 return ret;
1441}
1442
54a8ad92 1443/*
29753cdd
JH
1444 * Given the set of refs the local repository has, the set of refs the
1445 * remote repository has, and the refspec used for push, determine
1446 * what remote refs we will update and with what value by setting
1447 * peer_ref (which object is being pushed) and force (if the push is
1448 * forced) in elements of "dst". The function may add new elements to
1449 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
54a8ad92 1450 */
29753cdd
JH
1451int match_push_refs(struct ref *src, struct ref **dst,
1452 int nr_refspec, const char **refspec, int flags)
6b62816c 1453{
a83619d6 1454 struct refspec *rs;
28b9d6e5
AW
1455 int send_all = flags & MATCH_REFS_ALL;
1456 int send_mirror = flags & MATCH_REFS_MIRROR;
6ddba5e2 1457 int send_prune = flags & MATCH_REFS_PRUNE;
5f48cb95 1458 int errs;
2af202be 1459 static const char *default_refspec[] = { ":", NULL };
b1d8b1f3 1460 struct ref *ref, **dst_tail = tail_ref(dst);
f1bd15ab 1461 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
6b62816c 1462
a83619d6
PB
1463 if (!nr_refspec) {
1464 nr_refspec = 1;
1465 refspec = default_refspec;
1466 }
1467 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
6d2bf96e 1468 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
6b62816c
DB
1469
1470 /* pick the remainder */
b1d8b1f3 1471 for (ref = src; ref; ref = ref->next) {
f1bd15ab 1472 struct string_list_item *dst_item;
6b62816c 1473 struct ref *dst_peer;
6e66bf3c
AR
1474 const struct refspec *pat = NULL;
1475 char *dst_name;
db70a04c 1476
6ddba5e2 1477 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
db70a04c 1478 if (!dst_name)
a83619d6
PB
1479 continue;
1480
f1bd15ab
BC
1481 if (!dst_ref_index.nr)
1482 prepare_ref_index(&dst_ref_index, *dst);
1483
1484 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1485 dst_peer = dst_item ? dst_item->util : NULL;
a83619d6
PB
1486 if (dst_peer) {
1487 if (dst_peer->peer_ref)
1488 /* We're already sending something to this ref. */
1489 goto free_name;
a83619d6
PB
1490 } else {
1491 if (pat->matching && !(send_all || send_mirror))
1492 /*
1493 * Remote doesn't have it, and we have no
1494 * explicit pattern, and we don't have
01689909 1495 * --all or --mirror.
a83619d6
PB
1496 */
1497 goto free_name;
28b9d6e5 1498
6b62816c 1499 /* Create a new one and link it */
6d2bf96e 1500 dst_peer = make_linked_ref(dst_name, &dst_tail);
b1d8b1f3 1501 hashcpy(dst_peer->new_sha1, ref->new_sha1);
f1bd15ab
BC
1502 string_list_insert(&dst_ref_index,
1503 dst_peer->name)->util = dst_peer;
6b62816c 1504 }
b1d8b1f3 1505 dst_peer->peer_ref = copy_ref(ref);
a83619d6 1506 dst_peer->force = pat->force;
6e66bf3c
AR
1507 free_name:
1508 free(dst_name);
6b62816c 1509 }
c2aba155 1510
f1bd15ab
BC
1511 string_list_clear(&dst_ref_index, 0);
1512
c2aba155
JH
1513 if (flags & MATCH_REFS_FOLLOW_TAGS)
1514 add_missing_tags(src, dst, &dst_tail);
1515
6ddba5e2 1516 if (send_prune) {
f1bd15ab 1517 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
6ddba5e2
FC
1518 /* check for missing refs on the remote */
1519 for (ref = *dst; ref; ref = ref->next) {
1520 char *src_name;
1521
1522 if (ref->peer_ref)
1523 /* We're already sending something to this ref. */
1524 continue;
1525
1526 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1527 if (src_name) {
f1bd15ab
BC
1528 if (!src_ref_index.nr)
1529 prepare_ref_index(&src_ref_index, src);
1530 if (!string_list_has_string(&src_ref_index,
1531 src_name))
6ddba5e2
FC
1532 ref->peer_ref = alloc_delete_ref();
1533 free(src_name);
1534 }
1535 }
f1bd15ab 1536 string_list_clear(&src_ref_index, 0);
6ddba5e2 1537 }
5f48cb95
JS
1538 if (errs)
1539 return -1;
6b62816c
DB
1540 return 0;
1541}
cf818348 1542
20e8b465 1543void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
631b5ef2 1544 int force_update)
20e8b465
TRC
1545{
1546 struct ref *ref;
1547
1548 for (ref = remote_refs; ref; ref = ref->next) {
8c5f6f71 1549 int force_ref_update = ref->force || force_update;
631b5ef2 1550 int reject_reason = 0;
8c5f6f71 1551
20e8b465
TRC
1552 if (ref->peer_ref)
1553 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1554 else if (!send_mirror)
1555 continue;
1556
1557 ref->deletion = is_null_sha1(ref->new_sha1);
1558 if (!ref->deletion &&
1559 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1560 ref->status = REF_STATUS_UPTODATE;
1561 continue;
1562 }
1563
a272b289 1564 /*
631b5ef2
JH
1565 * Bypass the usual "must fast-forward" check but
1566 * replace it with a weaker "the old value must be
1567 * this value we observed". If the remote ref has
1568 * moved and is now different from what we expect,
1569 * reject any push.
1570 *
1571 * It also is an error if the user told us to check
1572 * with the remote-tracking branch to find the value
1573 * to expect, but we did not have such a tracking
1574 * branch.
1575 */
1576 if (ref->expect_old_sha1) {
1577 if (ref->expect_old_no_trackback ||
1578 hashcmp(ref->old_sha1, ref->old_sha1_expect))
1579 reject_reason = REF_STATUS_REJECT_STALE;
1580 }
1581
1582 /*
1583 * The usual "must fast-forward" rules.
1584 *
256b9d70
JH
1585 * Decide whether an individual refspec A:B can be
1586 * pushed. The push will succeed if any of the
1587 * following are true:
20e8b465 1588 *
a272b289 1589 * (1) the remote reference B does not exist
20e8b465 1590 *
a272b289
CR
1591 * (2) the remote reference B is being removed (i.e.,
1592 * pushing :B where no source is specified)
20e8b465 1593 *
256b9d70
JH
1594 * (3) the destination is not under refs/tags/, and
1595 * if the old and new value is a commit, the new
1596 * is a descendant of the old.
20e8b465 1597 *
a272b289
CR
1598 * (4) it is forced using the +A:B notation, or by
1599 * passing the --force argument
20e8b465
TRC
1600 */
1601
631b5ef2 1602 else if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
59556548 1603 if (starts_with(ref->name, "refs/tags/"))
631b5ef2 1604 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
75e5c0dc 1605 else if (!has_sha1_file(ref->old_sha1))
631b5ef2 1606 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
75e5c0dc
JH
1607 else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1608 !lookup_commit_reference_gently(ref->new_sha1, 1))
631b5ef2 1609 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
75e5c0dc 1610 else if (!ref_newer(ref->new_sha1, ref->old_sha1))
631b5ef2 1611 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
20e8b465 1612 }
631b5ef2
JH
1613
1614 /*
1615 * "--force" will defeat any rejection implemented
1616 * by the rules above.
1617 */
1618 if (!force_ref_update)
1619 ref->status = reject_reason;
1620 else if (reject_reason)
1621 ref->forced_update = 1;
20e8b465
TRC
1622 }
1623}
1624
05e73682
JH
1625static void set_merge(struct branch *ret)
1626{
9e3751d4 1627 struct remote *remote;
05e73682
JH
1628 char *ref;
1629 unsigned char sha1[20];
1630 int i;
1631
ee2499fe
JK
1632 if (!ret)
1633 return; /* no branch */
1634 if (ret->merge)
1635 return; /* already run */
1636 if (!ret->remote_name || !ret->merge_nr) {
1637 /*
1638 * no merge config; let's make sure we don't confuse callers
1639 * with a non-zero merge_nr but a NULL merge
1640 */
1641 ret->merge_nr = 0;
1642 return;
1643 }
1644
9e3751d4
JK
1645 remote = remote_get(ret->remote_name);
1646
05e73682
JH
1647 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1648 for (i = 0; i < ret->merge_nr; i++) {
1649 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1650 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
9e3751d4 1651 if (!remote_find_tracking(remote, ret->merge[i]) ||
05e73682
JH
1652 strcmp(ret->remote_name, "."))
1653 continue;
1654 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1655 sha1, &ref) == 1)
1656 ret->merge[i]->dst = ref;
1657 else
1658 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1659 }
1660}
1661
cf818348
DB
1662struct branch *branch_get(const char *name)
1663{
1664 struct branch *ret;
1665
1666 read_config();
1667 if (!name || !*name || !strcmp(name, "HEAD"))
1668 ret = current_branch;
1669 else
1670 ret = make_branch(name, 0);
ee2499fe 1671 set_merge(ret);
cf818348
DB
1672 return ret;
1673}
1674
1675int branch_has_merge_config(struct branch *branch)
1676{
1677 return branch && !!branch->merge;
1678}
1679
85682c19
SP
1680int branch_merge_matches(struct branch *branch,
1681 int i,
1682 const char *refname)
cf818348 1683{
85682c19 1684 if (!branch || i < 0 || i >= branch->merge_nr)
cf818348 1685 return 0;
54457fe5 1686 return refname_match(branch->merge[i]->src, refname);
cf818348 1687}
d71ab174 1688
3a429d0a
JK
1689__attribute((format (printf,2,3)))
1690static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1691{
1692 if (err) {
1693 va_list ap;
1694 va_start(ap, fmt);
1695 strbuf_vaddf(err, fmt, ap);
1696 va_end(ap);
1697 }
1698 return NULL;
1699}
1700
1701const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1702{
1703 if (!branch)
1704 return error_buf(err, _("HEAD does not point to a branch"));
1ca41a19
JK
1705
1706 if (!branch->merge || !branch->merge[0]) {
1707 /*
1708 * no merge config; is it because the user didn't define any,
1709 * or because it is not a real branch, and get_branch
1710 * auto-vivified it?
1711 */
3a429d0a
JK
1712 if (!ref_exists(branch->refname))
1713 return error_buf(err, _("no such branch: '%s'"),
1714 branch->name);
1ca41a19
JK
1715 return error_buf(err,
1716 _("no upstream configured for branch '%s'"),
1717 branch->name);
1718 }
1719
1720 if (!branch->merge[0]->dst)
3a429d0a
JK
1721 return error_buf(err,
1722 _("upstream branch '%s' not stored as a remote-tracking branch"),
1723 branch->merge[0]->src);
3a429d0a 1724
a9f9f8cc
JK
1725 return branch->merge[0]->dst;
1726}
1727
e291c75a
JK
1728static const char *tracking_for_push_dest(struct remote *remote,
1729 const char *refname,
1730 struct strbuf *err)
1731{
1732 char *ret;
1733
1734 ret = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
1735 if (!ret)
1736 return error_buf(err,
1737 _("push destination '%s' on remote '%s' has no local tracking branch"),
1738 refname, remote->name);
1739 return ret;
1740}
1741
1742static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1743{
1744 struct remote *remote;
1745
1746 if (!branch)
1747 return error_buf(err, _("HEAD does not point to a branch"));
1748
1749 remote = remote_get(pushremote_for_branch(branch, NULL));
1750 if (!remote)
1751 return error_buf(err,
1752 _("branch '%s' has no remote for pushing"),
1753 branch->name);
1754
1755 if (remote->push_refspec_nr) {
1756 char *dst;
1757 const char *ret;
1758
1759 dst = apply_refspecs(remote->push, remote->push_refspec_nr,
1760 branch->refname);
1761 if (!dst)
1762 return error_buf(err,
1763 _("push refspecs for '%s' do not include '%s'"),
1764 remote->name, branch->name);
1765
1766 ret = tracking_for_push_dest(remote, dst, err);
1767 free(dst);
1768 return ret;
1769 }
1770
1771 if (remote->mirror)
1772 return tracking_for_push_dest(remote, branch->refname, err);
1773
1774 switch (push_default) {
1775 case PUSH_DEFAULT_NOTHING:
1776 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1777
1778 case PUSH_DEFAULT_MATCHING:
1779 case PUSH_DEFAULT_CURRENT:
1780 return tracking_for_push_dest(remote, branch->refname, err);
1781
1782 case PUSH_DEFAULT_UPSTREAM:
1783 return branch_get_upstream(branch, err);
1784
1785 case PUSH_DEFAULT_UNSPECIFIED:
1786 case PUSH_DEFAULT_SIMPLE:
1787 {
1788 const char *up, *cur;
1789
1790 up = branch_get_upstream(branch, err);
1791 if (!up)
1792 return NULL;
1793 cur = tracking_for_push_dest(remote, branch->refname, err);
1794 if (!cur)
1795 return NULL;
1796 if (strcmp(cur, up))
1797 return error_buf(err,
1798 _("cannot resolve 'simple' push to a single destination"));
1799 return cur;
1800 }
1801 }
1802
1803 die("BUG: unhandled push situation");
1804}
1805
1806const char *branch_get_push(struct branch *branch, struct strbuf *err)
1807{
1808 if (!branch->push_tracking_ref)
1809 branch->push_tracking_ref = branch_get_push_1(branch, err);
1810 return branch->push_tracking_ref;
1811}
1812
f8fb971e
JH
1813static int ignore_symref_update(const char *refname)
1814{
1815 unsigned char sha1[20];
1816 int flag;
1817
7695d118 1818 if (!resolve_ref_unsafe(refname, 0, sha1, &flag))
f8fb971e
JH
1819 return 0; /* non-existing refs are OK */
1820 return (flag & REF_ISSYMREF);
1821}
1822
f166db26
MH
1823/*
1824 * Create and return a list of (struct ref) consisting of copies of
1825 * each remote_ref that matches refspec. refspec must be a pattern.
1826 * Fill in the copies' peer_ref to describe the local tracking refs to
1827 * which they map. Omit any references that would map to an existing
1828 * local symbolic ref.
1829 */
4577370e 1830static struct ref *get_expanded_map(const struct ref *remote_refs,
d71ab174
DB
1831 const struct refspec *refspec)
1832{
4577370e 1833 const struct ref *ref;
d71ab174
DB
1834 struct ref *ret = NULL;
1835 struct ref **tail = &ret;
1836
d71ab174 1837 for (ref = remote_refs; ref; ref = ref->next) {
e31a17f7
MH
1838 char *expn_name = NULL;
1839
d71ab174
DB
1840 if (strchr(ref->name, '^'))
1841 continue; /* a dereference item */
e928213f 1842 if (match_name_with_pattern(refspec->src, ref->name,
f8fb971e
JH
1843 refspec->dst, &expn_name) &&
1844 !ignore_symref_update(expn_name)) {
d71ab174 1845 struct ref *cpy = copy_ref(ref);
d71ab174 1846
e928213f 1847 cpy->peer_ref = alloc_ref(expn_name);
d71ab174
DB
1848 if (refspec->force)
1849 cpy->peer_ref->force = 1;
1850 *tail = cpy;
1851 tail = &cpy->next;
1852 }
e31a17f7 1853 free(expn_name);
d71ab174
DB
1854 }
1855
1856 return ret;
1857}
1858
4577370e 1859static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
d71ab174 1860{
4577370e 1861 const struct ref *ref;
d71ab174 1862 for (ref = refs; ref; ref = ref->next) {
54457fe5 1863 if (refname_match(name, ref->name))
d71ab174
DB
1864 return ref;
1865 }
1866 return NULL;
1867}
1868
4577370e 1869struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
d71ab174 1870{
4577370e 1871 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
d71ab174
DB
1872
1873 if (!ref)
9ad7c5ae 1874 return NULL;
d71ab174
DB
1875
1876 return copy_ref(ref);
1877}
1878
1879static struct ref *get_local_ref(const char *name)
1880{
3eb96997 1881 if (!name || name[0] == '\0')
d71ab174
DB
1882 return NULL;
1883
59556548 1884 if (starts_with(name, "refs/"))
59c69c0c 1885 return alloc_ref(name);
d71ab174 1886
59556548
CC
1887 if (starts_with(name, "heads/") ||
1888 starts_with(name, "tags/") ||
1889 starts_with(name, "remotes/"))
8009768e 1890 return alloc_ref_with_prefix("refs/", 5, name);
d71ab174 1891
8009768e 1892 return alloc_ref_with_prefix("refs/heads/", 11, name);
d71ab174
DB
1893}
1894
4577370e 1895int get_fetch_map(const struct ref *remote_refs,
d71ab174 1896 const struct refspec *refspec,
9ad7c5ae
JH
1897 struct ref ***tail,
1898 int missing_ok)
d71ab174 1899{
ef00d150 1900 struct ref *ref_map, **rmp;
d71ab174
DB
1901
1902 if (refspec->pattern) {
1903 ref_map = get_expanded_map(remote_refs, refspec);
1904 } else {
9ad7c5ae
JH
1905 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1906
6e7b66ee
JH
1907 if (refspec->exact_sha1) {
1908 ref_map = alloc_ref(name);
1909 get_sha1_hex(name, ref_map->old_sha1);
1910 } else {
1911 ref_map = get_remote_ref(remote_refs, name);
1912 }
9ad7c5ae
JH
1913 if (!missing_ok && !ref_map)
1914 die("Couldn't find remote ref %s", name);
1915 if (ref_map) {
1916 ref_map->peer_ref = get_local_ref(refspec->dst);
1917 if (ref_map->peer_ref && refspec->force)
1918 ref_map->peer_ref->force = 1;
1919 }
d71ab174
DB
1920 }
1921
ef00d150
DB
1922 for (rmp = &ref_map; *rmp; ) {
1923 if ((*rmp)->peer_ref) {
59556548 1924 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
5c08c1f2 1925 check_refname_format((*rmp)->peer_ref->name, 0)) {
ef00d150
DB
1926 struct ref *ignore = *rmp;
1927 error("* Ignoring funny ref '%s' locally",
1928 (*rmp)->peer_ref->name);
1929 *rmp = (*rmp)->next;
1930 free(ignore->peer_ref);
1931 free(ignore);
1932 continue;
1933 }
1934 }
1935 rmp = &((*rmp)->next);
d71ab174
DB
1936 }
1937
8f70a765
AR
1938 if (ref_map)
1939 tail_link_ref(ref_map, tail);
d71ab174
DB
1940
1941 return 0;
1942}
be885d96
DB
1943
1944int resolve_remote_symref(struct ref *ref, struct ref *list)
1945{
1946 if (!ref->symref)
1947 return 0;
1948 for (; list; list = list->next)
1949 if (!strcmp(ref->symref, list->name)) {
1950 hashcpy(ref->old_sha1, list->old_sha1);
1951 return 0;
1952 }
1953 return 1;
1954}
6d21bf96 1955
ec8452d5
JS
1956static void unmark_and_free(struct commit_list *list, unsigned int mark)
1957{
1958 while (list) {
1959 struct commit_list *temp = list;
1960 temp->item->object.flags &= ~mark;
1961 list = temp->next;
1962 free(temp);
1963 }
1964}
1965
1966int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1967{
1968 struct object *o;
1969 struct commit *old, *new;
1970 struct commit_list *list, *used;
1971 int found = 0;
1972
75e5c0dc
JH
1973 /*
1974 * Both new and old must be commit-ish and new is descendant of
ec8452d5
JS
1975 * old. Otherwise we require --force.
1976 */
1977 o = deref_tag(parse_object(old_sha1), NULL, 0);
1978 if (!o || o->type != OBJ_COMMIT)
1979 return 0;
1980 old = (struct commit *) o;
1981
1982 o = deref_tag(parse_object(new_sha1), NULL, 0);
1983 if (!o || o->type != OBJ_COMMIT)
1984 return 0;
1985 new = (struct commit *) o;
1986
1987 if (parse_commit(new) < 0)
1988 return 0;
1989
1990 used = list = NULL;
1991 commit_list_insert(new, &list);
1992 while (list) {
1993 new = pop_most_recent_commit(&list, TMP_MARK);
1994 commit_list_insert(new, &used);
1995 if (new == old) {
1996 found = 1;
1997 break;
1998 }
1999 }
2000 unmark_and_free(list, TMP_MARK);
2001 unmark_and_free(used, TMP_MARK);
2002 return found;
2003}
2004
6d21bf96 2005/*
f2e08739 2006 * Compare a branch with its upstream, and save their differences (number
979cb245
JK
2007 * of commits) in *num_ours and *num_theirs. The name of the upstream branch
2008 * (or NULL if no upstream is defined) is returned via *upstream_name, if it
2009 * is not itself NULL.
f2e08739 2010 *
979cb245
JK
2011 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
2012 * upstream defined, or ref does not exist), 0 otherwise.
6d21bf96 2013 */
979cb245
JK
2014int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
2015 const char **upstream_name)
6d21bf96
JH
2016{
2017 unsigned char sha1[20];
2018 struct commit *ours, *theirs;
2019 char symmetric[84];
2020 struct rev_info revs;
2021 const char *rev_argv[10], *base;
2022 int rev_argc;
2023
f2e08739 2024 /* Cannot stat unless we are marked to build on top of somebody else. */
3a429d0a 2025 base = branch_get_upstream(branch, NULL);
979cb245
JK
2026 if (upstream_name)
2027 *upstream_name = base;
a9f9f8cc 2028 if (!base)
979cb245 2029 return -1;
6d21bf96 2030
f2e08739 2031 /* Cannot stat if what we used to build on no longer exists */
c6893323 2032 if (read_ref(base, sha1))
f2e08739 2033 return -1;
57ffc5f8 2034 theirs = lookup_commit_reference(sha1);
6d21bf96 2035 if (!theirs)
f2e08739 2036 return -1;
6d21bf96 2037
c6893323 2038 if (read_ref(branch->refname, sha1))
f2e08739 2039 return -1;
57ffc5f8 2040 ours = lookup_commit_reference(sha1);
6d21bf96 2041 if (!ours)
f2e08739 2042 return -1;
6d21bf96
JH
2043
2044 /* are we the same? */
f2e08739
JX
2045 if (theirs == ours) {
2046 *num_theirs = *num_ours = 0;
979cb245 2047 return 0;
f2e08739 2048 }
6d21bf96 2049
8fbf879e 2050 /* Run "rev-list --left-right ours...theirs" internally... */
6d21bf96
JH
2051 rev_argc = 0;
2052 rev_argv[rev_argc++] = NULL;
2053 rev_argv[rev_argc++] = "--left-right";
2054 rev_argv[rev_argc++] = symmetric;
2055 rev_argv[rev_argc++] = "--";
2056 rev_argv[rev_argc] = NULL;
2057
2058 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
2059 strcpy(symmetric + 40, "...");
2060 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
2061
2062 init_revisions(&revs, NULL);
2063 setup_revisions(rev_argc, rev_argv, &revs, NULL);
81c3ce3c
SB
2064 if (prepare_revision_walk(&revs))
2065 die("revision walk setup failed");
6d21bf96
JH
2066
2067 /* ... and count the commits on each side. */
2068 *num_ours = 0;
2069 *num_theirs = 0;
2070 while (1) {
2071 struct commit *c = get_revision(&revs);
2072 if (!c)
2073 break;
2074 if (c->object.flags & SYMMETRIC_LEFT)
2075 (*num_ours)++;
2076 else
2077 (*num_theirs)++;
2078 }
c0234b2e
JH
2079
2080 /* clear object flags smudged by the above traversal */
2081 clear_commit_marks(ours, ALL_REV_FLAGS);
2082 clear_commit_marks(theirs, ALL_REV_FLAGS);
979cb245 2083 return 0;
6d21bf96
JH
2084}
2085
2086/*
2087 * Return true when there is anything to report, otherwise false.
2088 */
2089int format_tracking_info(struct branch *branch, struct strbuf *sb)
2090{
f2e08739 2091 int ours, theirs;
979cb245 2092 const char *full_base;
2f50babe 2093 char *base;
f2e08739 2094 int upstream_is_gone = 0;
6d21bf96 2095
979cb245
JK
2096 if (stat_tracking_info(branch, &ours, &theirs, &full_base) < 0) {
2097 if (!full_base)
2098 return 0;
f2e08739 2099 upstream_is_gone = 1;
f2e08739 2100 }
6d21bf96 2101
979cb245 2102 base = shorten_unambiguous_ref(full_base, 0);
f2e08739
JX
2103 if (upstream_is_gone) {
2104 strbuf_addf(sb,
2105 _("Your branch is based on '%s', but the upstream is gone.\n"),
2106 base);
2107 if (advice_status_hints)
2108 strbuf_addf(sb,
2109 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
f223459b
JX
2110 } else if (!ours && !theirs) {
2111 strbuf_addf(sb,
2112 _("Your branch is up-to-date with '%s'.\n"),
2113 base);
f2e08739 2114 } else if (!theirs) {
8a5b7494
JX
2115 strbuf_addf(sb,
2116 Q_("Your branch is ahead of '%s' by %d commit.\n",
2117 "Your branch is ahead of '%s' by %d commits.\n",
f2e08739
JX
2118 ours),
2119 base, ours);
491e3075
JK
2120 if (advice_status_hints)
2121 strbuf_addf(sb,
2122 _(" (use \"git push\" to publish your local commits)\n"));
f2e08739 2123 } else if (!ours) {
8a5b7494
JX
2124 strbuf_addf(sb,
2125 Q_("Your branch is behind '%s' by %d commit, "
2126 "and can be fast-forwarded.\n",
2127 "Your branch is behind '%s' by %d commits, "
2128 "and can be fast-forwarded.\n",
f2e08739
JX
2129 theirs),
2130 base, theirs);
491e3075
JK
2131 if (advice_status_hints)
2132 strbuf_addf(sb,
2133 _(" (use \"git pull\" to update your local branch)\n"));
c190ced6 2134 } else {
8a5b7494
JX
2135 strbuf_addf(sb,
2136 Q_("Your branch and '%s' have diverged,\n"
2137 "and have %d and %d different commit each, "
2138 "respectively.\n",
2139 "Your branch and '%s' have diverged,\n"
2140 "and have %d and %d different commits each, "
2141 "respectively.\n",
f2e08739
JX
2142 theirs),
2143 base, ours, theirs);
491e3075
JK
2144 if (advice_status_hints)
2145 strbuf_addf(sb,
2146 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
c190ced6 2147 }
2f50babe 2148 free(base);
6d21bf96
JH
2149 return 1;
2150}
454e2025 2151
455ade65
MH
2152static int one_local_ref(const char *refname, const struct object_id *oid,
2153 int flag, void *cb_data)
454e2025
JS
2154{
2155 struct ref ***local_tail = cb_data;
2156 struct ref *ref;
2157 int len;
2158
2159 /* we already know it starts with refs/ to get here */
8d9c5010 2160 if (check_refname_format(refname + 5, 0))
454e2025
JS
2161 return 0;
2162
2163 len = strlen(refname) + 1;
2164 ref = xcalloc(1, sizeof(*ref) + len);
455ade65 2165 hashcpy(ref->new_sha1, oid->hash);
454e2025
JS
2166 memcpy(ref->name, refname, len);
2167 **local_tail = ref;
2168 *local_tail = &ref->next;
2169 return 0;
2170}
2171
2172struct ref *get_local_heads(void)
2173{
55f0566f 2174 struct ref *local_refs = NULL, **local_tail = &local_refs;
2b2a5be3 2175
454e2025
JS
2176 for_each_ref(one_local_ref, &local_tail);
2177 return local_refs;
2178}
8ef51733 2179
4229f1fa
JS
2180struct ref *guess_remote_head(const struct ref *head,
2181 const struct ref *refs,
2182 int all)
8ef51733 2183{
8ef51733 2184 const struct ref *r;
4229f1fa
JS
2185 struct ref *list = NULL;
2186 struct ref **tail = &list;
8ef51733 2187
6cb4e6cc 2188 if (!head)
8ef51733
JS
2189 return NULL;
2190
fbb074c2
JK
2191 /*
2192 * Some transports support directly peeking at
2193 * where HEAD points; if that is the case, then
2194 * we don't have to guess.
2195 */
2196 if (head->symref)
2197 return copy_ref(find_ref_by_name(refs, head->symref));
2198
8ef51733 2199 /* If refs/heads/master could be right, it is. */
4229f1fa
JS
2200 if (!all) {
2201 r = find_ref_by_name(refs, "refs/heads/master");
2202 if (r && !hashcmp(r->old_sha1, head->old_sha1))
2203 return copy_ref(r);
2204 }
8ef51733
JS
2205
2206 /* Look for another ref that points there */
4229f1fa 2207 for (r = refs; r; r = r->next) {
61adfd30 2208 if (r != head &&
59556548 2209 starts_with(r->name, "refs/heads/") &&
61adfd30 2210 !hashcmp(r->old_sha1, head->old_sha1)) {
4229f1fa
JS
2211 *tail = copy_ref(r);
2212 tail = &((*tail)->next);
2213 if (!all)
2214 break;
2215 }
2216 }
8ef51733 2217
4229f1fa 2218 return list;
8ef51733 2219}
f2ef6075
JS
2220
2221struct stale_heads_info {
f2ef6075
JS
2222 struct string_list *ref_names;
2223 struct ref **stale_refs_tail;
ed43de6e
CMN
2224 struct refspec *refs;
2225 int ref_count;
f2ef6075
JS
2226};
2227
455ade65
MH
2228static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2229 int flags, void *cb_data)
f2ef6075
JS
2230{
2231 struct stale_heads_info *info = cb_data;
e6f63712 2232 struct string_list matches = STRING_LIST_INIT_DUP;
ed43de6e 2233 struct refspec query;
e6f63712 2234 int i, stale = 1;
ed43de6e
CMN
2235 memset(&query, 0, sizeof(struct refspec));
2236 query.dst = (char *)refname;
2237
e6f63712
CMN
2238 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2239 if (matches.nr == 0)
2240 goto clean_exit; /* No matches */
ed43de6e
CMN
2241
2242 /*
2243 * If we did find a suitable refspec and it's not a symref and
2244 * it's not in the list of refs that currently exist in that
e6f63712
CMN
2245 * remote, we consider it to be stale. In order to deal with
2246 * overlapping refspecs, we need to go over all of the
2247 * matching refs.
ed43de6e 2248 */
e6f63712
CMN
2249 if (flags & REF_ISSYMREF)
2250 goto clean_exit;
2251
2252 for (i = 0; stale && i < matches.nr; i++)
2253 if (string_list_has_string(info->ref_names, matches.items[i].string))
2254 stale = 0;
2255
2256 if (stale) {
ed43de6e 2257 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
455ade65 2258 hashcpy(ref->new_sha1, oid->hash);
f2ef6075 2259 }
ed43de6e 2260
e6f63712
CMN
2261clean_exit:
2262 string_list_clear(&matches, 0);
f2ef6075
JS
2263 return 0;
2264}
2265
ed43de6e 2266struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
f2ef6075
JS
2267{
2268 struct ref *ref, *stale_refs = NULL;
183113a5 2269 struct string_list ref_names = STRING_LIST_INIT_NODUP;
f2ef6075 2270 struct stale_heads_info info;
2b2a5be3 2271
f2ef6075
JS
2272 info.ref_names = &ref_names;
2273 info.stale_refs_tail = &stale_refs;
ed43de6e
CMN
2274 info.refs = refs;
2275 info.ref_count = ref_count;
f2ef6075 2276 for (ref = fetch_map; ref; ref = ref->next)
1d2f80fa 2277 string_list_append(&ref_names, ref->name);
3383e199 2278 string_list_sort(&ref_names);
f2ef6075
JS
2279 for_each_ref(get_stale_heads_cb, &info);
2280 string_list_clear(&ref_names, 0);
2281 return stale_refs;
2282}
28f5d176
JH
2283
2284/*
2285 * Compare-and-swap
2286 */
a355b11d 2287static void clear_cas_option(struct push_cas_option *cas)
28f5d176
JH
2288{
2289 int i;
2290
2291 for (i = 0; i < cas->nr; i++)
2292 free(cas->entry[i].refname);
2293 free(cas->entry);
2294 memset(cas, 0, sizeof(*cas));
2295}
2296
2297static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2298 const char *refname,
2299 size_t refnamelen)
2300{
2301 struct push_cas *entry;
2302 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2303 entry = &cas->entry[cas->nr++];
2304 memset(entry, 0, sizeof(*entry));
2305 entry->refname = xmemdupz(refname, refnamelen);
2306 return entry;
2307}
2308
2309int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2310{
2311 const char *colon;
2312 struct push_cas *entry;
2313
2314 if (unset) {
2315 /* "--no-<option>" */
2316 clear_cas_option(cas);
2317 return 0;
2318 }
2319
2320 if (!arg) {
2321 /* just "--<option>" */
2322 cas->use_tracking_for_rest = 1;
2323 return 0;
2324 }
2325
2326 /* "--<option>=refname" or "--<option>=refname:value" */
2327 colon = strchrnul(arg, ':');
2328 entry = add_cas_entry(cas, arg, colon - arg);
2329 if (!*colon)
2330 entry->use_tracking = 1;
2331 else if (get_sha1(colon + 1, entry->expect))
2332 return error("cannot parse expected object name '%s'", colon + 1);
2333 return 0;
2334}
2335
2336int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2337{
2338 return parse_push_cas_option(opt->value, arg, unset);
2339}
91048a95
JH
2340
2341int is_empty_cas(const struct push_cas_option *cas)
2342{
2343 return !cas->use_tracking_for_rest && !cas->nr;
2344}
2345
2346/*
2347 * Look at remote.fetch refspec and see if we have a remote
2348 * tracking branch for the refname there. Fill its current
2349 * value in sha1[].
2350 * If we cannot do so, return negative to signal an error.
2351 */
2352static int remote_tracking(struct remote *remote, const char *refname,
2353 unsigned char sha1[20])
2354{
2355 char *dst;
2356
2357 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2358 if (!dst)
2359 return -1; /* no tracking ref for refname at remote */
2360 if (read_ref(dst, sha1))
2361 return -1; /* we know what the tracking ref is but we cannot read it */
2362 return 0;
2363}
2364
2365static void apply_cas(struct push_cas_option *cas,
2366 struct remote *remote,
2367 struct ref *ref)
2368{
2369 int i;
2370
2371 /* Find an explicit --<option>=<name>[:<value>] entry */
2372 for (i = 0; i < cas->nr; i++) {
2373 struct push_cas *entry = &cas->entry[i];
54457fe5 2374 if (!refname_match(entry->refname, ref->name))
91048a95
JH
2375 continue;
2376 ref->expect_old_sha1 = 1;
2377 if (!entry->use_tracking)
2378 hashcpy(ref->old_sha1_expect, cas->entry[i].expect);
2379 else if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2380 ref->expect_old_no_trackback = 1;
2381 return;
2382 }
2383
2384 /* Are we using "--<option>" to cover all? */
2385 if (!cas->use_tracking_for_rest)
2386 return;
2387
2388 ref->expect_old_sha1 = 1;
2389 if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2390 ref->expect_old_no_trackback = 1;
2391}
2392
2393void apply_push_cas(struct push_cas_option *cas,
2394 struct remote *remote,
2395 struct ref *remote_refs)
2396{
2397 struct ref *ref;
2398 for (ref = remote_refs; ref; ref = ref->next)
2399 apply_cas(cas, remote, ref);
2400}