remote.c: hoist branch.*.remote lookup out of remote_get_1
[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;
98b406f3 52static const char *branch_pushremote_name;
f24f715e 53static const char *pushremote_name;
cf818348 54
d071d942 55static struct rewrites rewrites;
1c2eafb8 56static struct rewrites rewrites_push;
55029ae4 57
5751f490
DB
58#define BUF_SIZE (2048)
59static char buffer[BUF_SIZE];
60
0a4da29d
DB
61static int valid_remote(const struct remote *remote)
62{
c578f51d 63 return (!!remote->url) || (!!remote->foreign_vcs);
0a4da29d
DB
64}
65
d071d942 66static const char *alias_url(const char *url, struct rewrites *r)
55029ae4
DB
67{
68 int i, j;
844112ca
JH
69 char *ret;
70 struct counted_string *longest;
71 int longest_i;
72
73 longest = NULL;
74 longest_i = -1;
d071d942
JT
75 for (i = 0; i < r->rewrite_nr; i++) {
76 if (!r->rewrite[i])
55029ae4 77 continue;
d071d942 78 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
59556548 79 if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
844112ca 80 (!longest ||
d071d942
JT
81 longest->len < r->rewrite[i]->instead_of[j].len)) {
82 longest = &(r->rewrite[i]->instead_of[j]);
844112ca 83 longest_i = i;
55029ae4
DB
84 }
85 }
86 }
844112ca
JH
87 if (!longest)
88 return url;
89
d071d942 90 ret = xmalloc(r->rewrite[longest_i]->baselen +
844112ca 91 (strlen(url) - longest->len) + 1);
d071d942
JT
92 strcpy(ret, r->rewrite[longest_i]->base);
93 strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
844112ca 94 return ret;
55029ae4
DB
95}
96
5751f490
DB
97static void add_push_refspec(struct remote *remote, const char *ref)
98{
2d31347b
DB
99 ALLOC_GROW(remote->push_refspec,
100 remote->push_refspec_nr + 1,
101 remote->push_refspec_alloc);
102 remote->push_refspec[remote->push_refspec_nr++] = ref;
5751f490
DB
103}
104
5d46c9d4
DB
105static void add_fetch_refspec(struct remote *remote, const char *ref)
106{
2d31347b
DB
107 ALLOC_GROW(remote->fetch_refspec,
108 remote->fetch_refspec_nr + 1,
109 remote->fetch_refspec_alloc);
110 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
5d46c9d4
DB
111}
112
28b91f8a 113static void add_url(struct remote *remote, const char *url)
5751f490 114{
2d31347b
DB
115 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
116 remote->url[remote->url_nr++] = url;
5751f490
DB
117}
118
20346234
MG
119static void add_pushurl(struct remote *remote, const char *pushurl)
120{
121 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
122 remote->pushurl[remote->pushurl_nr++] = pushurl;
123}
124
1c2eafb8
JT
125static void add_pushurl_alias(struct remote *remote, const char *url)
126{
127 const char *pushurl = alias_url(url, &rewrites_push);
128 if (pushurl != url)
129 add_pushurl(remote, pushurl);
130}
131
132static void add_url_alias(struct remote *remote, const char *url)
133{
134 add_url(remote, alias_url(url, &rewrites));
135 add_pushurl_alias(remote, url);
136}
137
d0da003d
PR
138struct remotes_hash_key {
139 const char *str;
140 int len;
141};
142
143static int remotes_hash_cmp(const struct remote *a, const struct remote *b, const struct remotes_hash_key *key)
144{
145 if (key)
146 return strncmp(a->name, key->str, key->len) || a->name[key->len];
147 else
148 return strcmp(a->name, b->name);
149}
150
151static inline void init_remotes_hash(void)
152{
153 if (!remotes_hash.cmpfn)
154 hashmap_init(&remotes_hash, (hashmap_cmp_fn)remotes_hash_cmp, 0);
155}
156
5751f490
DB
157static struct remote *make_remote(const char *name, int len)
158{
d0da003d
PR
159 struct remote *ret, *replaced;
160 struct remotes_hash_key lookup;
161 struct hashmap_entry lookup_entry;
5751f490 162
d0da003d
PR
163 if (!len)
164 len = strlen(name);
165
166 init_remotes_hash();
167 lookup.str = name;
168 lookup.len = len;
169 hashmap_entry_init(&lookup_entry, memhash(name, len));
170
171 if ((ret = hashmap_get(&remotes_hash, &lookup_entry, &lookup)) != NULL)
172 return ret;
5751f490 173
2d31347b 174 ret = xcalloc(1, sizeof(struct remote));
737c5a9c 175 ret->prune = -1; /* unspecified */
2d31347b
DB
176 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
177 remotes[remotes_nr++] = ret;
d0da003d
PR
178 ret->name = xstrndup(name, len);
179
180 hashmap_entry_init(ret, lookup_entry.hash);
181 replaced = hashmap_put(&remotes_hash, ret);
182 assert(replaced == NULL); /* no previous entry overwritten */
2d31347b 183 return ret;
5751f490
DB
184}
185
cf818348
DB
186static void add_merge(struct branch *branch, const char *name)
187{
2d31347b
DB
188 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
189 branch->merge_alloc);
190 branch->merge_name[branch->merge_nr++] = name;
cf818348
DB
191}
192
193static struct branch *make_branch(const char *name, int len)
194{
2d31347b
DB
195 struct branch *ret;
196 int i;
cf818348 197
2d31347b
DB
198 for (i = 0; i < branches_nr; i++) {
199 if (len ? (!strncmp(name, branches[i]->name, len) &&
200 !branches[i]->name[len]) :
201 !strcmp(name, branches[i]->name))
202 return branches[i];
cf818348
DB
203 }
204
2d31347b
DB
205 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
206 ret = xcalloc(1, sizeof(struct branch));
207 branches[branches_nr++] = ret;
cf818348 208 if (len)
2d31347b 209 ret->name = xstrndup(name, len);
cf818348 210 else
2d31347b 211 ret->name = xstrdup(name);
fa3f60b7 212 ret->refname = xstrfmt("refs/heads/%s", ret->name);
cf818348 213
2d31347b 214 return ret;
cf818348
DB
215}
216
d071d942 217static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
55029ae4
DB
218{
219 struct rewrite *ret;
220 int i;
221
d071d942 222 for (i = 0; i < r->rewrite_nr; i++) {
844112ca 223 if (len
d071d942
JT
224 ? (len == r->rewrite[i]->baselen &&
225 !strncmp(base, r->rewrite[i]->base, len))
226 : !strcmp(base, r->rewrite[i]->base))
227 return r->rewrite[i];
55029ae4
DB
228 }
229
d071d942 230 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
55029ae4 231 ret = xcalloc(1, sizeof(struct rewrite));
d071d942 232 r->rewrite[r->rewrite_nr++] = ret;
844112ca 233 if (len) {
55029ae4 234 ret->base = xstrndup(base, len);
844112ca
JH
235 ret->baselen = len;
236 }
237 else {
55029ae4 238 ret->base = xstrdup(base);
844112ca
JH
239 ret->baselen = strlen(base);
240 }
55029ae4
DB
241 return ret;
242}
243
244static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
245{
246 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
844112ca
JH
247 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
248 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
249 rewrite->instead_of_nr++;
55029ae4
DB
250}
251
5751f490
DB
252static void read_remotes_file(struct remote *remote)
253{
254 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
255
256 if (!f)
257 return;
89cf4c70 258 remote->origin = REMOTE_REMOTES;
5751f490
DB
259 while (fgets(buffer, BUF_SIZE, f)) {
260 int value_list;
261 char *s, *p;
262
59556548 263 if (starts_with(buffer, "URL:")) {
5751f490
DB
264 value_list = 0;
265 s = buffer + 4;
59556548 266 } else if (starts_with(buffer, "Push:")) {
5751f490
DB
267 value_list = 1;
268 s = buffer + 5;
59556548 269 } else if (starts_with(buffer, "Pull:")) {
5d46c9d4
DB
270 value_list = 2;
271 s = buffer + 5;
5751f490
DB
272 } else
273 continue;
274
275 while (isspace(*s))
276 s++;
277 if (!*s)
278 continue;
279
280 p = s + strlen(s);
281 while (isspace(p[-1]))
282 *--p = 0;
283
284 switch (value_list) {
285 case 0:
55029ae4 286 add_url_alias(remote, xstrdup(s));
5751f490
DB
287 break;
288 case 1:
289 add_push_refspec(remote, xstrdup(s));
290 break;
5d46c9d4
DB
291 case 2:
292 add_fetch_refspec(remote, xstrdup(s));
293 break;
5751f490
DB
294 }
295 }
296 fclose(f);
297}
298
299static void read_branches_file(struct remote *remote)
300{
cf818348 301 char *frag;
f285a2d7 302 struct strbuf branch = STRBUF_INIT;
55cfde25 303 int n = 1000;
5751f490
DB
304 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
305 char *s, *p;
306 int len;
307
308 if (!f)
309 return;
310 s = fgets(buffer, BUF_SIZE, f);
311 fclose(f);
312 if (!s)
313 return;
314 while (isspace(*s))
315 s++;
316 if (!*s)
317 return;
89cf4c70 318 remote->origin = REMOTE_BRANCHES;
5751f490
DB
319 p = s + strlen(s);
320 while (isspace(p[-1]))
321 *--p = 0;
322 len = p - s;
5751f490
DB
323 p = xmalloc(len + 1);
324 strcpy(p, s);
472fa4cd
DB
325
326 /*
55cfde25 327 * The branches file would have URL and optionally
472fa4cd
DB
328 * #branch specified. The "master" (or specified) branch is
329 * fetched and stored in the local branch of the same name.
330 */
cf818348
DB
331 frag = strchr(p, '#');
332 if (frag) {
333 *(frag++) = '\0';
472fa4cd
DB
334 strbuf_addf(&branch, "refs/heads/%s", frag);
335 } else
336 strbuf_addstr(&branch, "refs/heads/master");
55cfde25
RR
337
338 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
55029ae4 339 add_url_alias(remote, p);
2af202be 340 add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
18afe101
MK
341 /*
342 * Cogito compatible push: push current HEAD to remote #branch
343 * (master if missing)
344 */
345 strbuf_init(&branch, 0);
346 strbuf_addstr(&branch, "HEAD");
347 if (frag)
348 strbuf_addf(&branch, ":refs/heads/%s", frag);
349 else
350 strbuf_addstr(&branch, ":refs/heads/master");
2af202be 351 add_push_refspec(remote, strbuf_detach(&branch, NULL));
d71ab174 352 remote->fetch_tags = 1; /* always auto-follow */
5751f490
DB
353}
354
ef90d6d4 355static int handle_config(const char *key, const char *value, void *cb)
5751f490
DB
356{
357 const char *name;
358 const char *subkey;
359 struct remote *remote;
cf818348 360 struct branch *branch;
59556548 361 if (starts_with(key, "branch.")) {
cf818348
DB
362 name = key + 7;
363 subkey = strrchr(name, '.');
cf818348
DB
364 if (!subkey)
365 return 0;
896c0535 366 branch = make_branch(name, subkey - name);
cf818348 367 if (!strcmp(subkey, ".remote")) {
e41bf352 368 return git_config_string(&branch->remote_name, key, value);
9f765ce6
RR
369 } else if (!strcmp(subkey, ".pushremote")) {
370 if (branch == current_branch)
98b406f3 371 if (git_config_string(&branch_pushremote_name, key, value))
9f765ce6 372 return -1;
d2370cc2
JH
373 } else if (!strcmp(subkey, ".merge")) {
374 if (!value)
375 return config_error_nonbool(key);
cf818348 376 add_merge(branch, xstrdup(value));
d2370cc2 377 }
cf818348 378 return 0;
5751f490 379 }
59556548 380 if (starts_with(key, "url.")) {
55029ae4 381 struct rewrite *rewrite;
60e3aba9 382 name = key + 4;
55029ae4
DB
383 subkey = strrchr(name, '.');
384 if (!subkey)
385 return 0;
55029ae4 386 if (!strcmp(subkey, ".insteadof")) {
1c2eafb8
JT
387 rewrite = make_rewrite(&rewrites, name, subkey - name);
388 if (!value)
389 return config_error_nonbool(key);
390 add_instead_of(rewrite, xstrdup(value));
391 } else if (!strcmp(subkey, ".pushinsteadof")) {
392 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
55029ae4
DB
393 if (!value)
394 return config_error_nonbool(key);
395 add_instead_of(rewrite, xstrdup(value));
396 }
397 }
224c2171 398
59556548 399 if (!starts_with(key, "remote."))
5751f490
DB
400 return 0;
401 name = key + 7;
224c2171
RR
402
403 /* Handle remote.* variables */
404 if (!strcmp(name, "pushdefault"))
405 return git_config_string(&pushremote_name, key, value);
406
407 /* Handle remote.<name>.* variables */
c82efafc
BC
408 if (*name == '/') {
409 warning("Config remote shorthand cannot begin with '/': %s",
410 name);
411 return 0;
412 }
5751f490
DB
413 subkey = strrchr(name, '.');
414 if (!subkey)
cd294bc3 415 return 0;
5751f490 416 remote = make_remote(name, subkey - name);
89cf4c70 417 remote->origin = REMOTE_CONFIG;
84bb2dfd
PB
418 if (!strcmp(subkey, ".mirror"))
419 remote->mirror = git_config_bool(key, value);
420 else if (!strcmp(subkey, ".skipdefaultupdate"))
421 remote->skip_default_update = git_config_bool(key, value);
7cc91a2f
BG
422 else if (!strcmp(subkey, ".skipfetchall"))
423 remote->skip_default_update = git_config_bool(key, value);
737c5a9c
MS
424 else if (!strcmp(subkey, ".prune"))
425 remote->prune = git_config_bool(key, value);
84bb2dfd
PB
426 else if (!strcmp(subkey, ".url")) {
427 const char *v;
428 if (git_config_string(&v, key, value))
429 return -1;
430 add_url(remote, v);
20346234
MG
431 } else if (!strcmp(subkey, ".pushurl")) {
432 const char *v;
433 if (git_config_string(&v, key, value))
434 return -1;
435 add_pushurl(remote, v);
5751f490 436 } else if (!strcmp(subkey, ".push")) {
84bb2dfd
PB
437 const char *v;
438 if (git_config_string(&v, key, value))
439 return -1;
440 add_push_refspec(remote, v);
5d46c9d4 441 } else if (!strcmp(subkey, ".fetch")) {
84bb2dfd
PB
442 const char *v;
443 if (git_config_string(&v, key, value))
444 return -1;
445 add_fetch_refspec(remote, v);
5751f490 446 } else if (!strcmp(subkey, ".receivepack")) {
84bb2dfd
PB
447 const char *v;
448 if (git_config_string(&v, key, value))
449 return -1;
5751f490 450 if (!remote->receivepack)
84bb2dfd 451 remote->receivepack = v;
5751f490
DB
452 else
453 error("more than one receivepack given, using the first");
0012ba21 454 } else if (!strcmp(subkey, ".uploadpack")) {
84bb2dfd
PB
455 const char *v;
456 if (git_config_string(&v, key, value))
457 return -1;
0012ba21 458 if (!remote->uploadpack)
84bb2dfd 459 remote->uploadpack = v;
0012ba21
DB
460 else
461 error("more than one uploadpack given, using the first");
d71ab174
DB
462 } else if (!strcmp(subkey, ".tagopt")) {
463 if (!strcmp(value, "--no-tags"))
464 remote->fetch_tags = -1;
944163a4
ST
465 else if (!strcmp(value, "--tags"))
466 remote->fetch_tags = 2;
14c98218 467 } else if (!strcmp(subkey, ".proxy")) {
84bb2dfd
PB
468 return git_config_string((const char **)&remote->http_proxy,
469 key, value);
c578f51d
DB
470 } else if (!strcmp(subkey, ".vcs")) {
471 return git_config_string(&remote->foreign_vcs, key, value);
84bb2dfd 472 }
5751f490
DB
473 return 0;
474}
475
55029ae4
DB
476static void alias_all_urls(void)
477{
478 int i, j;
479 for (i = 0; i < remotes_nr; i++) {
1c2eafb8 480 int add_pushurl_aliases;
55029ae4
DB
481 if (!remotes[i])
482 continue;
20346234 483 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
d071d942 484 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
20346234 485 }
1c2eafb8
JT
486 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
487 for (j = 0; j < remotes[i]->url_nr; j++) {
488 if (add_pushurl_aliases)
489 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
490 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
491 }
55029ae4
DB
492 }
493}
494
5751f490
DB
495static void read_config(void)
496{
e41bf352 497 static int loaded;
5751f490
DB
498 unsigned char sha1[20];
499 const char *head_ref;
500 int flag;
e41bf352
JK
501
502 if (loaded)
5751f490 503 return;
e41bf352
JK
504 loaded = 1;
505
5751f490 506 current_branch = NULL;
7695d118 507 head_ref = resolve_ref_unsafe("HEAD", 0, sha1, &flag);
5751f490 508 if (head_ref && (flag & REF_ISSYMREF) &&
95b567c7
JK
509 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
510 current_branch = make_branch(head_ref, 0);
5751f490 511 }
ef90d6d4 512 git_config(handle_config, NULL);
98b406f3
JK
513 if (branch_pushremote_name) {
514 free((char *)pushremote_name);
515 pushremote_name = branch_pushremote_name;
516 }
55029ae4 517 alias_all_urls();
5751f490
DB
518}
519
2cb1f36d
BC
520/*
521 * This function frees a refspec array.
522 * Warning: code paths should be checked to ensure that the src
523 * and dst pointers are always freeable pointers as well
524 * as the refspec pointer itself.
525 */
697d7f5d 526static void free_refspecs(struct refspec *refspec, int nr_refspec)
2cb1f36d
BC
527{
528 int i;
529
530 if (!refspec)
531 return;
532
533 for (i = 0; i < nr_refspec; i++) {
534 free(refspec[i].src);
535 free(refspec[i].dst);
536 }
537 free(refspec);
538}
539
24b6177e 540static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
6b62816c
DB
541{
542 int i;
da7a478b 543 struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
46220ca1 544
6b62816c 545 for (i = 0; i < nr_refspec; i++) {
47c6ef1c 546 size_t llen;
46220ca1
JH
547 int is_glob;
548 const char *lhs, *rhs;
8d9c5010 549 int flags;
46220ca1 550
8e76bf3f 551 is_glob = 0;
46220ca1
JH
552
553 lhs = refspec[i];
554 if (*lhs == '+') {
6b62816c 555 rs[i].force = 1;
46220ca1 556 lhs++;
6b62816c 557 }
46220ca1
JH
558
559 rhs = strrchr(lhs, ':');
a83619d6
PB
560
561 /*
562 * Before going on, special case ":" (or "+:") as a refspec
def24991 563 * for pushing matching refs.
a83619d6
PB
564 */
565 if (!fetch && rhs == lhs && rhs[1] == '\0') {
566 rs[i].matching = 1;
567 continue;
568 }
569
46220ca1 570 if (rhs) {
47c6ef1c 571 size_t rlen = strlen(++rhs);
abd2bde7 572 is_glob = (1 <= rlen && strchr(rhs, '*'));
08fbdb30 573 rs[i].dst = xstrndup(rhs, rlen);
6b62816c 574 }
ef00d150 575
46220ca1 576 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
abd2bde7 577 if (1 <= llen && memchr(lhs, '*', llen)) {
7d19da46
JH
578 if ((rhs && !is_glob) || (!rhs && fetch))
579 goto invalid;
580 is_glob = 1;
7d19da46
JH
581 } else if (rhs && is_glob) {
582 goto invalid;
ef00d150 583 }
7d19da46 584
46220ca1
JH
585 rs[i].pattern = is_glob;
586 rs[i].src = xstrndup(lhs, llen);
8d9c5010 587 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
46220ca1
JH
588
589 if (fetch) {
6e7b66ee
JH
590 unsigned char unused[40];
591
def24991 592 /* LHS */
46220ca1 593 if (!*rs[i].src)
def24991 594 ; /* empty is ok; it means "HEAD" */
6e7b66ee
JH
595 else if (llen == 40 && !get_sha1_hex(rs[i].src, unused))
596 rs[i].exact_sha1 = 1; /* ok */
def24991
JH
597 else if (!check_refname_format(rs[i].src, flags))
598 ; /* valid looking ref is ok */
599 else
8d9c5010 600 goto invalid;
def24991 601 /* RHS */
8d9c5010 602 if (!rs[i].dst)
def24991 603 ; /* missing is ok; it is the same as empty */
8d9c5010 604 else if (!*rs[i].dst)
def24991
JH
605 ; /* empty is ok; it means "do not store" */
606 else if (!check_refname_format(rs[i].dst, flags))
607 ; /* valid looking ref is ok */
608 else
8d9c5010 609 goto invalid;
46220ca1
JH
610 } else {
611 /*
612 * LHS
613 * - empty is allowed; it means delete.
614 * - when wildcarded, it must be a valid looking ref.
615 * - otherwise, it must be an extended SHA-1, but
616 * there is no existing way to validate this.
617 */
618 if (!*rs[i].src)
619 ; /* empty is ok */
620 else if (is_glob) {
8d9c5010 621 if (check_refname_format(rs[i].src, flags))
46220ca1
JH
622 goto invalid;
623 }
624 else
625 ; /* anything goes, for now */
626 /*
627 * RHS
628 * - missing is allowed, but LHS then must be a
629 * valid looking ref.
630 * - empty is not allowed.
631 * - otherwise it must be a valid looking ref.
632 */
633 if (!rs[i].dst) {
8d9c5010 634 if (check_refname_format(rs[i].src, flags))
46220ca1
JH
635 goto invalid;
636 } else if (!*rs[i].dst) {
637 goto invalid;
638 } else {
8d9c5010 639 if (check_refname_format(rs[i].dst, flags))
46220ca1
JH
640 goto invalid;
641 }
ef00d150 642 }
6b62816c
DB
643 }
644 return rs;
46220ca1
JH
645
646 invalid:
24b6177e 647 if (verify) {
2cb1f36d
BC
648 /*
649 * nr_refspec must be greater than zero and i must be valid
650 * since it is only possible to reach this point from within
651 * the for loop above.
652 */
653 free_refspecs(rs, i+1);
24b6177e
JF
654 return NULL;
655 }
46220ca1
JH
656 die("Invalid refspec '%s'", refspec[i]);
657}
658
24b6177e
JF
659int valid_fetch_refspec(const char *fetch_refspec_str)
660{
24b6177e
JF
661 struct refspec *refspec;
662
66dbfd55 663 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
2cb1f36d 664 free_refspecs(refspec, 1);
24b6177e
JF
665 return !!refspec;
666}
667
46220ca1
JH
668struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
669{
24b6177e 670 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
46220ca1
JH
671}
672
697d7f5d 673static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
46220ca1 674{
24b6177e 675 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
6b62816c
DB
676}
677
72ff8943
DB
678void free_refspec(int nr_refspec, struct refspec *refspec)
679{
680 int i;
681 for (i = 0; i < nr_refspec; i++) {
682 free(refspec[i].src);
683 free(refspec[i].dst);
684 }
685 free(refspec);
686}
687
df93e33c
DB
688static int valid_remote_nick(const char *name)
689{
8ca12c0d 690 if (!name[0] || is_dot_or_dotdot(name))
df93e33c
DB
691 return 0;
692 return !strchr(name, '/'); /* no slash */
693}
694
f052154d
JK
695const char *remote_for_branch(struct branch *branch, int *explicit)
696{
697 if (branch && branch->remote_name) {
698 if (explicit)
699 *explicit = 1;
700 return branch->remote_name;
701 }
702 if (explicit)
703 *explicit = 0;
704 return "origin";
705}
706
f24f715e 707static struct remote *remote_get_1(const char *name, const char *pushremote_name)
5751f490
DB
708{
709 struct remote *ret;
fa685bdf 710 int name_given = 0;
5751f490 711
fa685bdf
DB
712 if (name)
713 name_given = 1;
714 else {
f24f715e
RR
715 if (pushremote_name) {
716 name = pushremote_name;
717 name_given = 1;
f052154d
JK
718 } else
719 name = remote_for_branch(current_branch, &name_given);
fa685bdf 720 }
9326d494 721
5751f490 722 ret = make_remote(name, 0);
df93e33c 723 if (valid_remote_nick(name)) {
0a4da29d 724 if (!valid_remote(ret))
5751f490 725 read_remotes_file(ret);
0a4da29d 726 if (!valid_remote(ret))
5751f490
DB
727 read_branches_file(ret);
728 }
0a4da29d 729 if (name_given && !valid_remote(ret))
55029ae4 730 add_url_alias(ret, name);
0a4da29d 731 if (!valid_remote(ret))
5751f490 732 return NULL;
46220ca1
JH
733 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
734 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
5751f490
DB
735 return ret;
736}
6b62816c 737
f24f715e
RR
738struct remote *remote_get(const char *name)
739{
740 read_config();
741 return remote_get_1(name, NULL);
742}
743
744struct remote *pushremote_get(const char *name)
745{
746 read_config();
747 return remote_get_1(name, pushremote_name);
748}
749
9a23ba33
FAG
750int remote_is_configured(const char *name)
751{
d0da003d
PR
752 struct remotes_hash_key lookup;
753 struct hashmap_entry lookup_entry;
9a23ba33
FAG
754 read_config();
755
d0da003d
PR
756 init_remotes_hash();
757 lookup.str = name;
758 lookup.len = strlen(name);
759 hashmap_entry_init(&lookup_entry, memhash(name, lookup.len));
760
761 return hashmap_get(&remotes_hash, &lookup_entry, &lookup) != NULL;
9a23ba33
FAG
762}
763
b42f6927
JS
764int for_each_remote(each_remote_fn fn, void *priv)
765{
766 int i, result = 0;
767 read_config();
2d31347b 768 for (i = 0; i < remotes_nr && !result; i++) {
b42f6927
JS
769 struct remote *r = remotes[i];
770 if (!r)
771 continue;
772 if (!r->fetch)
46220ca1
JH
773 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
774 r->fetch_refspec);
b42f6927 775 if (!r->push)
46220ca1
JH
776 r->push = parse_push_refspec(r->push_refspec_nr,
777 r->push_refspec);
b42f6927
JS
778 result = fn(r, priv);
779 }
780 return result;
781}
782
df02ebda
MH
783static void handle_duplicate(struct ref *ref1, struct ref *ref2)
784{
f096e6e8
MH
785 if (strcmp(ref1->name, ref2->name)) {
786 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
787 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
788 die(_("Cannot fetch both %s and %s to %s"),
789 ref1->name, ref2->name, ref2->peer_ref->name);
790 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
791 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
792 warning(_("%s usually tracks %s, not %s"),
793 ref2->peer_ref->name, ref2->name, ref1->name);
794 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
795 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
796 die(_("%s tracks both %s and %s"),
797 ref2->peer_ref->name, ref1->name, ref2->name);
798 } else {
799 /*
800 * This last possibility doesn't occur because
801 * FETCH_HEAD_IGNORE entries always appear at
802 * the end of the list.
803 */
804 die(_("Internal error"));
805 }
806 }
df02ebda
MH
807 free(ref2->peer_ref);
808 free(ref2);
809}
810
b9afe665 811struct ref *ref_remove_duplicates(struct ref *ref_map)
2467a4fa 812{
183113a5 813 struct string_list refs = STRING_LIST_INIT_NODUP;
b9afe665
MH
814 struct ref *retval = NULL;
815 struct ref **p = &retval;
73cf0822 816
b9afe665
MH
817 while (ref_map) {
818 struct ref *ref = ref_map;
819
820 ref_map = ref_map->next;
821 ref->next = NULL;
73cf0822 822
b9afe665
MH
823 if (!ref->peer_ref) {
824 *p = ref;
825 p = &ref->next;
09ea1f8e 826 } else {
b9afe665
MH
827 struct string_list_item *item =
828 string_list_insert(&refs, ref->peer_ref->name);
829
830 if (item->util) {
831 /* Entry already existed */
df02ebda 832 handle_duplicate((struct ref *)item->util, ref);
b9afe665
MH
833 } else {
834 *p = ref;
835 p = &ref->next;
836 item->util = ref;
837 }
2467a4fa
DB
838 }
839 }
b9afe665 840
73cf0822 841 string_list_clear(&refs, 0);
b9afe665 842 return retval;
2467a4fa
DB
843}
844
28b91f8a 845int remote_has_url(struct remote *remote, const char *url)
5d46c9d4
DB
846{
847 int i;
28b91f8a
SP
848 for (i = 0; i < remote->url_nr; i++) {
849 if (!strcmp(remote->url[i], url))
5d46c9d4
DB
850 return 1;
851 }
852 return 0;
853}
854
e928213f
DB
855static int match_name_with_pattern(const char *key, const char *name,
856 const char *value, char **result)
a3c84239 857{
08fbdb30
DB
858 const char *kstar = strchr(key, '*');
859 size_t klen;
abd2bde7
DB
860 size_t ksuffixlen;
861 size_t namelen;
08fbdb30
DB
862 int ret;
863 if (!kstar)
864 die("Key '%s' of pattern had no '*'", key);
865 klen = kstar - key;
abd2bde7
DB
866 ksuffixlen = strlen(kstar + 1);
867 namelen = strlen(name);
868 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
869 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
e928213f 870 if (ret && value) {
07bfa575 871 struct strbuf sb = STRBUF_INIT;
08fbdb30 872 const char *vstar = strchr(value, '*');
08fbdb30
DB
873 if (!vstar)
874 die("Value '%s' of pattern has no '*'", value);
07bfa575
RS
875 strbuf_add(&sb, value, vstar - value);
876 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
877 strbuf_addstr(&sb, vstar + 1);
878 *result = strbuf_detach(&sb, NULL);
e928213f 879 }
a3c84239
DB
880 return ret;
881}
882
e6f63712
CMN
883static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
884{
885 int i;
886 int find_src = !query->src;
887
888 if (find_src && !query->dst)
889 error("query_refspecs_multiple: need either src or dst");
890
891 for (i = 0; i < ref_count; i++) {
892 struct refspec *refspec = &refs[i];
893 const char *key = find_src ? refspec->dst : refspec->src;
894 const char *value = find_src ? refspec->src : refspec->dst;
895 const char *needle = find_src ? query->dst : query->src;
896 char **result = find_src ? &query->src : &query->dst;
897
898 if (!refspec->dst)
899 continue;
900 if (refspec->pattern) {
901 if (match_name_with_pattern(key, needle, value, result))
902 string_list_append_nodup(results, *result);
903 } else if (!strcmp(needle, key)) {
904 string_list_append(results, value);
905 }
906 }
907}
908
ca02465b 909int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
72ff8943
DB
910{
911 int i;
c500352e 912 int find_src = !query->src;
049bff8f
MH
913 const char *needle = find_src ? query->dst : query->src;
914 char **result = find_src ? &query->src : &query->dst;
72ff8943 915
c500352e
CMN
916 if (find_src && !query->dst)
917 return error("query_refspecs: need either src or dst");
b42f6927 918
c500352e
CMN
919 for (i = 0; i < ref_count; i++) {
920 struct refspec *refspec = &refs[i];
921 const char *key = find_src ? refspec->dst : refspec->src;
922 const char *value = find_src ? refspec->src : refspec->dst;
b42f6927 923
c500352e 924 if (!refspec->dst)
5d46c9d4 925 continue;
c500352e 926 if (refspec->pattern) {
e928213f 927 if (match_name_with_pattern(key, needle, value, result)) {
c500352e 928 query->force = refspec->force;
5d46c9d4
DB
929 return 0;
930 }
b42f6927
JS
931 } else if (!strcmp(needle, key)) {
932 *result = xstrdup(value);
c500352e 933 query->force = refspec->force;
b42f6927 934 return 0;
5d46c9d4
DB
935 }
936 }
5d46c9d4
DB
937 return -1;
938}
939
c500352e
CMN
940char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
941 const char *name)
942{
943 struct refspec query;
944
945 memset(&query, 0, sizeof(struct refspec));
946 query.src = (char *)name;
947
948 if (query_refspecs(refspecs, nr_refspec, &query))
949 return NULL;
950
951 return query.dst;
952}
953
954int remote_find_tracking(struct remote *remote, struct refspec *refspec)
955{
956 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
957}
958
8009768e
RS
959static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
960 const char *name)
961{
962 size_t len = strlen(name);
963 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
964 memcpy(ref->name, prefix, prefixlen);
965 memcpy(ref->name + prefixlen, name, len);
966 return ref;
967}
968
59c69c0c 969struct ref *alloc_ref(const char *name)
dfd255dd 970{
59c69c0c 971 return alloc_ref_with_prefix("", 0, name);
737922aa
KK
972}
973
59a57757 974struct ref *copy_ref(const struct ref *ref)
d71ab174 975{
7b3db095
JS
976 struct ref *cpy;
977 size_t len;
978 if (!ref)
979 return NULL;
980 len = strlen(ref->name);
981 cpy = xmalloc(sizeof(struct ref) + len + 1);
982 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
983 cpy->next = NULL;
8c53f071
JK
984 cpy->symref = xstrdup_or_null(ref->symref);
985 cpy->remote_status = xstrdup_or_null(ref->remote_status);
7b3db095
JS
986 cpy->peer_ref = copy_ref(ref->peer_ref);
987 return cpy;
d71ab174
DB
988}
989
4577370e
DB
990struct ref *copy_ref_list(const struct ref *ref)
991{
992 struct ref *ret = NULL;
993 struct ref **tail = &ret;
994 while (ref) {
995 *tail = copy_ref(ref);
996 ref = ref->next;
997 tail = &((*tail)->next);
998 }
999 return ret;
1000}
1001
697d7f5d 1002static void free_ref(struct ref *ref)
be885d96
DB
1003{
1004 if (!ref)
1005 return;
7b3db095 1006 free_ref(ref->peer_ref);
be885d96
DB
1007 free(ref->remote_status);
1008 free(ref->symref);
1009 free(ref);
1010}
1011
dfd255dd
DB
1012void free_refs(struct ref *ref)
1013{
1014 struct ref *next;
1015 while (ref) {
1016 next = ref->next;
be885d96 1017 free_ref(ref);
dfd255dd
DB
1018 ref = next;
1019 }
1020}
1021
ed81c76b
JK
1022int ref_compare_name(const void *va, const void *vb)
1023{
1024 const struct ref *a = va, *b = vb;
1025 return strcmp(a->name, b->name);
1026}
1027
1028static void *ref_list_get_next(const void *a)
1029{
1030 return ((const struct ref *)a)->next;
1031}
1032
1033static void ref_list_set_next(void *a, void *next)
1034{
1035 ((struct ref *)a)->next = next;
1036}
1037
1038void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
1039{
1040 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
1041}
1042
ca02465b
JH
1043int count_refspec_match(const char *pattern,
1044 struct ref *refs,
1045 struct ref **matched_ref)
6b62816c
DB
1046{
1047 int patlen = strlen(pattern);
1048 struct ref *matched_weak = NULL;
1049 struct ref *matched = NULL;
1050 int weak_match = 0;
1051 int match = 0;
1052
1053 for (weak_match = match = 0; refs; refs = refs->next) {
1054 char *name = refs->name;
1055 int namelen = strlen(name);
6b62816c 1056
54457fe5 1057 if (!refname_match(pattern, name))
6b62816c
DB
1058 continue;
1059
1060 /* A match is "weak" if it is with refs outside
1061 * heads or tags, and did not specify the pattern
1062 * in full (e.g. "refs/remotes/origin/master") or at
1063 * least from the toplevel (e.g. "remotes/origin/master");
1064 * otherwise "git push $URL master" would result in
1065 * ambiguity between remotes/origin/master and heads/master
1066 * at the remote site.
1067 */
1068 if (namelen != patlen &&
1069 patlen != namelen - 5 &&
59556548
CC
1070 !starts_with(name, "refs/heads/") &&
1071 !starts_with(name, "refs/tags/")) {
6b62816c
DB
1072 /* We want to catch the case where only weak
1073 * matches are found and there are multiple
1074 * matches, and where more than one strong
1075 * matches are found, as ambiguous. One
1076 * strong match with zero or more weak matches
1077 * are acceptable as a unique match.
1078 */
1079 matched_weak = refs;
1080 weak_match++;
1081 }
1082 else {
1083 matched = refs;
1084 match++;
1085 }
1086 }
1087 if (!matched) {
471fd3fe
JK
1088 if (matched_ref)
1089 *matched_ref = matched_weak;
6b62816c
DB
1090 return weak_match;
1091 }
1092 else {
471fd3fe
JK
1093 if (matched_ref)
1094 *matched_ref = matched;
6b62816c
DB
1095 return match;
1096 }
1097}
1098
1d735267 1099static void tail_link_ref(struct ref *ref, struct ref ***tail)
6b62816c
DB
1100{
1101 **tail = ref;
1d735267
DB
1102 while (ref->next)
1103 ref = ref->next;
6b62816c 1104 *tail = &ref->next;
6b62816c
DB
1105}
1106
67655246
FC
1107static struct ref *alloc_delete_ref(void)
1108{
1109 struct ref *ref = alloc_ref("(delete)");
1110 hashclr(ref->new_sha1);
1111 return ref;
1112}
1113
471fd3fe
JK
1114static int try_explicit_object_name(const char *name,
1115 struct ref **match)
6b62816c
DB
1116{
1117 unsigned char sha1[20];
6b62816c 1118
471fd3fe
JK
1119 if (!*name) {
1120 if (match)
1121 *match = alloc_delete_ref();
1122 return 0;
1123 }
1124
6b62816c 1125 if (get_sha1(name, sha1))
471fd3fe
JK
1126 return -1;
1127
1128 if (match) {
1129 *match = alloc_ref(name);
1130 hashcpy((*match)->new_sha1, sha1);
1131 }
1132 return 0;
6b62816c
DB
1133}
1134
1d735267 1135static struct ref *make_linked_ref(const char *name, struct ref ***tail)
6b62816c 1136{
59c69c0c 1137 struct ref *ret = alloc_ref(name);
1d735267
DB
1138 tail_link_ref(ret, tail);
1139 return ret;
163f0ee5 1140}
8558fd9e 1141
f8aae120
JK
1142static char *guess_ref(const char *name, struct ref *peer)
1143{
1144 struct strbuf buf = STRBUF_INIT;
1145 unsigned char sha1[20];
1146
7695d118
RS
1147 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1148 sha1, NULL);
f8aae120
JK
1149 if (!r)
1150 return NULL;
1151
59556548 1152 if (starts_with(r, "refs/heads/"))
f8aae120 1153 strbuf_addstr(&buf, "refs/heads/");
59556548 1154 else if (starts_with(r, "refs/tags/"))
f8aae120
JK
1155 strbuf_addstr(&buf, "refs/tags/");
1156 else
1157 return NULL;
1158
1159 strbuf_addstr(&buf, name);
1160 return strbuf_detach(&buf, NULL);
1161}
1162
f7ade3d3
JK
1163static int match_explicit_lhs(struct ref *src,
1164 struct refspec *rs,
1165 struct ref **match,
1166 int *allocated_match)
1167{
1168 switch (count_refspec_match(rs->src, src, match)) {
1169 case 1:
471fd3fe
JK
1170 if (allocated_match)
1171 *allocated_match = 0;
f7ade3d3
JK
1172 return 0;
1173 case 0:
1174 /* The source could be in the get_sha1() format
1175 * not a reference name. :refs/other is a
1176 * way to delete 'other' ref at the remote end.
1177 */
471fd3fe 1178 if (try_explicit_object_name(rs->src, match) < 0)
f7ade3d3 1179 return error("src refspec %s does not match any.", rs->src);
471fd3fe
JK
1180 if (allocated_match)
1181 *allocated_match = 1;
f7ade3d3
JK
1182 return 0;
1183 default:
1184 return error("src refspec %s matches more than one.", rs->src);
1185 }
1186}
1187
54a8ad92
JH
1188static int match_explicit(struct ref *src, struct ref *dst,
1189 struct ref ***dst_tail,
9a7bbd1d 1190 struct refspec *rs)
6b62816c 1191{
54a8ad92 1192 struct ref *matched_src, *matched_dst;
f7ade3d3 1193 int allocated_src;
8558fd9e 1194
54a8ad92 1195 const char *dst_value = rs->dst;
f8aae120 1196 char *dst_guess;
6b62816c 1197
a83619d6 1198 if (rs->pattern || rs->matching)
9a7bbd1d 1199 return 0;
8558fd9e 1200
54a8ad92 1201 matched_src = matched_dst = NULL;
f7ade3d3
JK
1202 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1203 return -1;
3c8b7df1 1204
4491e62a 1205 if (!dst_value) {
9f0ea7e8
DB
1206 unsigned char sha1[20];
1207 int flag;
1208
7695d118
RS
1209 dst_value = resolve_ref_unsafe(matched_src->name,
1210 RESOLVE_REF_READING,
1211 sha1, &flag);
9f0ea7e8
DB
1212 if (!dst_value ||
1213 ((flag & REF_ISSYMREF) &&
59556548 1214 !starts_with(dst_value, "refs/heads/")))
9f0ea7e8
DB
1215 die("%s cannot be resolved to branch.",
1216 matched_src->name);
4491e62a 1217 }
3c8b7df1 1218
54a8ad92
JH
1219 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1220 case 1:
1221 break;
1222 case 0:
50e19a83 1223 if (starts_with(dst_value, "refs/"))
1d735267 1224 matched_dst = make_linked_ref(dst_value, dst_tail);
5742c82b
JK
1225 else if (is_null_sha1(matched_src->new_sha1))
1226 error("unable to delete '%s': remote ref does not exist",
1227 dst_value);
eeefa7c9 1228 else if ((dst_guess = guess_ref(dst_value, matched_src)))
f8aae120 1229 matched_dst = make_linked_ref(dst_guess, dst_tail);
3c8b7df1 1230 else
f8aae120
JK
1231 error("unable to push to unqualified destination: %s\n"
1232 "The destination refspec neither matches an "
1233 "existing ref on the remote nor\n"
1234 "begins with refs/, and we are unable to "
1235 "guess a prefix based on the source ref.",
1236 dst_value);
54a8ad92
JH
1237 break;
1238 default:
3c8b7df1 1239 matched_dst = NULL;
54a8ad92
JH
1240 error("dst refspec %s matches more than one.",
1241 dst_value);
1242 break;
1243 }
9a7bbd1d
JK
1244 if (!matched_dst)
1245 return -1;
1246 if (matched_dst->peer_ref)
1247 return error("dst ref %s receives from more than one src.",
54a8ad92 1248 matched_dst->name);
54a8ad92 1249 else {
f7ade3d3
JK
1250 matched_dst->peer_ref = allocated_src ?
1251 matched_src :
1252 copy_ref(matched_src);
54a8ad92 1253 matched_dst->force = rs->force;
6b62816c 1254 }
9a7bbd1d 1255 return 0;
54a8ad92
JH
1256}
1257
1258static int match_explicit_refs(struct ref *src, struct ref *dst,
1259 struct ref ***dst_tail, struct refspec *rs,
1260 int rs_nr)
1261{
1262 int i, errs;
1263 for (i = errs = 0; i < rs_nr; i++)
9a7bbd1d
JK
1264 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1265 return errs;
6b62816c
DB
1266}
1267
db70a04c 1268static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
6ddba5e2 1269 int send_mirror, int direction, const struct refspec **ret_pat)
8558fd9e 1270{
db70a04c
FC
1271 const struct refspec *pat;
1272 char *name;
8558fd9e 1273 int i;
a83619d6 1274 int matching_refs = -1;
8558fd9e 1275 for (i = 0; i < rs_nr; i++) {
a83619d6
PB
1276 if (rs[i].matching &&
1277 (matching_refs == -1 || rs[i].force)) {
1278 matching_refs = i;
1279 continue;
1280 }
1281
db70a04c
FC
1282 if (rs[i].pattern) {
1283 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
6ddba5e2
FC
1284 int match;
1285 if (direction == FROM_SRC)
1286 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1287 else
1288 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1289 if (match) {
db70a04c
FC
1290 matching_refs = i;
1291 break;
1292 }
1293 }
8558fd9e 1294 }
db70a04c 1295 if (matching_refs == -1)
a83619d6 1296 return NULL;
db70a04c
FC
1297
1298 pat = rs + matching_refs;
1299 if (pat->matching) {
1300 /*
1301 * "matching refs"; traditionally we pushed everything
1302 * including refs outside refs/heads/ hierarchy, but
1303 * that does not make much sense these days.
1304 */
59556548 1305 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
db70a04c
FC
1306 return NULL;
1307 name = xstrdup(ref->name);
1308 }
1309 if (ret_pat)
1310 *ret_pat = pat;
1311 return name;
8558fd9e
DB
1312}
1313
6d2bf96e
CB
1314static struct ref **tail_ref(struct ref **head)
1315{
1316 struct ref **tail = head;
1317 while (*tail)
1318 tail = &((*tail)->next);
1319 return tail;
1320}
1321
c2aba155
JH
1322struct tips {
1323 struct commit **tip;
1324 int nr, alloc;
1325};
1326
1327static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1328{
1329 struct commit *commit;
1330
1331 if (is_null_sha1(sha1))
1332 return;
1333 commit = lookup_commit_reference_gently(sha1, 1);
1334 if (!commit || (commit->object.flags & TMP_MARK))
1335 return;
1336 commit->object.flags |= TMP_MARK;
1337 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1338 tips->tip[tips->nr++] = commit;
1339}
1340
1341static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1342{
1343 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1344 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1345 struct string_list_item *item;
1346 struct ref *ref;
1347 struct tips sent_tips;
1348
1349 /*
1350 * Collect everything we know they would have at the end of
1351 * this push, and collect all tags they have.
1352 */
1353 memset(&sent_tips, 0, sizeof(sent_tips));
1354 for (ref = *dst; ref; ref = ref->next) {
1355 if (ref->peer_ref &&
1356 !is_null_sha1(ref->peer_ref->new_sha1))
1357 add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1358 else
1359 add_to_tips(&sent_tips, ref->old_sha1);
59556548 1360 if (starts_with(ref->name, "refs/tags/"))
c2aba155
JH
1361 string_list_append(&dst_tag, ref->name);
1362 }
1363 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1364
3383e199 1365 string_list_sort(&dst_tag);
c2aba155
JH
1366
1367 /* Collect tags they do not have. */
1368 for (ref = src; ref; ref = ref->next) {
59556548 1369 if (!starts_with(ref->name, "refs/tags/"))
c2aba155
JH
1370 continue; /* not a tag */
1371 if (string_list_has_string(&dst_tag, ref->name))
1372 continue; /* they already have it */
1373 if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1374 continue; /* be conservative */
1375 item = string_list_append(&src_tag, ref->name);
1376 item->util = ref;
1377 }
1378 string_list_clear(&dst_tag, 0);
1379
1380 /*
1381 * At this point, src_tag lists tags that are missing from
1382 * dst, and sent_tips lists the tips we are pushing or those
1383 * that we know they already have. An element in the src_tag
1384 * that is an ancestor of any of the sent_tips needs to be
1385 * sent to the other side.
1386 */
1387 if (sent_tips.nr) {
1388 for_each_string_list_item(item, &src_tag) {
1389 struct ref *ref = item->util;
1390 struct ref *dst_ref;
1391 struct commit *commit;
1392
1393 if (is_null_sha1(ref->new_sha1))
1394 continue;
1395 commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1396 if (!commit)
1397 /* not pushing a commit, which is not an error */
1398 continue;
1399
1400 /*
1401 * Is this tag, which they do not have, reachable from
1402 * any of the commits we are sending?
1403 */
1404 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1405 continue;
1406
1407 /* Add it in */
1408 dst_ref = make_linked_ref(ref->name, dst_tail);
1409 hashcpy(dst_ref->new_sha1, ref->new_sha1);
1410 dst_ref->peer_ref = copy_ref(ref);
1411 }
1412 }
1413 string_list_clear(&src_tag, 0);
1414 free(sent_tips.tip);
1415}
1416
47a59185
JH
1417struct ref *find_ref_by_name(const struct ref *list, const char *name)
1418{
1419 for ( ; list; list = list->next)
1420 if (!strcmp(list->name, name))
1421 return (struct ref *)list;
1422 return NULL;
1423}
1424
f1bd15ab
BC
1425static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1426{
1427 for ( ; ref; ref = ref->next)
1428 string_list_append_nodup(ref_index, ref->name)->util = ref;
1429
3383e199 1430 string_list_sort(ref_index);
f1bd15ab
BC
1431}
1432
ba928c13
JK
1433/*
1434 * Given only the set of local refs, sanity-check the set of push
1435 * refspecs. We can't catch all errors that match_push_refs would,
1436 * but we can catch some errors early before even talking to the
1437 * remote side.
1438 */
1439int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1440{
1441 struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1442 int ret = 0;
1443 int i;
1444
1445 for (i = 0; i < nr_refspec; i++) {
1446 struct refspec *rs = refspec + i;
1447
1448 if (rs->pattern || rs->matching)
1449 continue;
1450
1451 ret |= match_explicit_lhs(src, rs, NULL, NULL);
1452 }
1453
1454 free_refspec(nr_refspec, refspec);
1455 return ret;
1456}
1457
54a8ad92 1458/*
29753cdd
JH
1459 * Given the set of refs the local repository has, the set of refs the
1460 * remote repository has, and the refspec used for push, determine
1461 * what remote refs we will update and with what value by setting
1462 * peer_ref (which object is being pushed) and force (if the push is
1463 * forced) in elements of "dst". The function may add new elements to
1464 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
54a8ad92 1465 */
29753cdd
JH
1466int match_push_refs(struct ref *src, struct ref **dst,
1467 int nr_refspec, const char **refspec, int flags)
6b62816c 1468{
a83619d6 1469 struct refspec *rs;
28b9d6e5
AW
1470 int send_all = flags & MATCH_REFS_ALL;
1471 int send_mirror = flags & MATCH_REFS_MIRROR;
6ddba5e2 1472 int send_prune = flags & MATCH_REFS_PRUNE;
5f48cb95 1473 int errs;
2af202be 1474 static const char *default_refspec[] = { ":", NULL };
b1d8b1f3 1475 struct ref *ref, **dst_tail = tail_ref(dst);
f1bd15ab 1476 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
6b62816c 1477
a83619d6
PB
1478 if (!nr_refspec) {
1479 nr_refspec = 1;
1480 refspec = default_refspec;
1481 }
1482 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
6d2bf96e 1483 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
6b62816c
DB
1484
1485 /* pick the remainder */
b1d8b1f3 1486 for (ref = src; ref; ref = ref->next) {
f1bd15ab 1487 struct string_list_item *dst_item;
6b62816c 1488 struct ref *dst_peer;
6e66bf3c
AR
1489 const struct refspec *pat = NULL;
1490 char *dst_name;
db70a04c 1491
6ddba5e2 1492 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
db70a04c 1493 if (!dst_name)
a83619d6
PB
1494 continue;
1495
f1bd15ab
BC
1496 if (!dst_ref_index.nr)
1497 prepare_ref_index(&dst_ref_index, *dst);
1498
1499 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1500 dst_peer = dst_item ? dst_item->util : NULL;
a83619d6
PB
1501 if (dst_peer) {
1502 if (dst_peer->peer_ref)
1503 /* We're already sending something to this ref. */
1504 goto free_name;
a83619d6
PB
1505 } else {
1506 if (pat->matching && !(send_all || send_mirror))
1507 /*
1508 * Remote doesn't have it, and we have no
1509 * explicit pattern, and we don't have
01689909 1510 * --all or --mirror.
a83619d6
PB
1511 */
1512 goto free_name;
28b9d6e5 1513
6b62816c 1514 /* Create a new one and link it */
6d2bf96e 1515 dst_peer = make_linked_ref(dst_name, &dst_tail);
b1d8b1f3 1516 hashcpy(dst_peer->new_sha1, ref->new_sha1);
f1bd15ab
BC
1517 string_list_insert(&dst_ref_index,
1518 dst_peer->name)->util = dst_peer;
6b62816c 1519 }
b1d8b1f3 1520 dst_peer->peer_ref = copy_ref(ref);
a83619d6 1521 dst_peer->force = pat->force;
6e66bf3c
AR
1522 free_name:
1523 free(dst_name);
6b62816c 1524 }
c2aba155 1525
f1bd15ab
BC
1526 string_list_clear(&dst_ref_index, 0);
1527
c2aba155
JH
1528 if (flags & MATCH_REFS_FOLLOW_TAGS)
1529 add_missing_tags(src, dst, &dst_tail);
1530
6ddba5e2 1531 if (send_prune) {
f1bd15ab 1532 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
6ddba5e2
FC
1533 /* check for missing refs on the remote */
1534 for (ref = *dst; ref; ref = ref->next) {
1535 char *src_name;
1536
1537 if (ref->peer_ref)
1538 /* We're already sending something to this ref. */
1539 continue;
1540
1541 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1542 if (src_name) {
f1bd15ab
BC
1543 if (!src_ref_index.nr)
1544 prepare_ref_index(&src_ref_index, src);
1545 if (!string_list_has_string(&src_ref_index,
1546 src_name))
6ddba5e2
FC
1547 ref->peer_ref = alloc_delete_ref();
1548 free(src_name);
1549 }
1550 }
f1bd15ab 1551 string_list_clear(&src_ref_index, 0);
6ddba5e2 1552 }
5f48cb95
JS
1553 if (errs)
1554 return -1;
6b62816c
DB
1555 return 0;
1556}
cf818348 1557
20e8b465 1558void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
631b5ef2 1559 int force_update)
20e8b465
TRC
1560{
1561 struct ref *ref;
1562
1563 for (ref = remote_refs; ref; ref = ref->next) {
8c5f6f71 1564 int force_ref_update = ref->force || force_update;
631b5ef2 1565 int reject_reason = 0;
8c5f6f71 1566
20e8b465
TRC
1567 if (ref->peer_ref)
1568 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1569 else if (!send_mirror)
1570 continue;
1571
1572 ref->deletion = is_null_sha1(ref->new_sha1);
1573 if (!ref->deletion &&
1574 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1575 ref->status = REF_STATUS_UPTODATE;
1576 continue;
1577 }
1578
a272b289 1579 /*
631b5ef2
JH
1580 * Bypass the usual "must fast-forward" check but
1581 * replace it with a weaker "the old value must be
1582 * this value we observed". If the remote ref has
1583 * moved and is now different from what we expect,
1584 * reject any push.
1585 *
1586 * It also is an error if the user told us to check
1587 * with the remote-tracking branch to find the value
1588 * to expect, but we did not have such a tracking
1589 * branch.
1590 */
1591 if (ref->expect_old_sha1) {
1592 if (ref->expect_old_no_trackback ||
1593 hashcmp(ref->old_sha1, ref->old_sha1_expect))
1594 reject_reason = REF_STATUS_REJECT_STALE;
1595 }
1596
1597 /*
1598 * The usual "must fast-forward" rules.
1599 *
256b9d70
JH
1600 * Decide whether an individual refspec A:B can be
1601 * pushed. The push will succeed if any of the
1602 * following are true:
20e8b465 1603 *
a272b289 1604 * (1) the remote reference B does not exist
20e8b465 1605 *
a272b289
CR
1606 * (2) the remote reference B is being removed (i.e.,
1607 * pushing :B where no source is specified)
20e8b465 1608 *
256b9d70
JH
1609 * (3) the destination is not under refs/tags/, and
1610 * if the old and new value is a commit, the new
1611 * is a descendant of the old.
20e8b465 1612 *
a272b289
CR
1613 * (4) it is forced using the +A:B notation, or by
1614 * passing the --force argument
20e8b465
TRC
1615 */
1616
631b5ef2 1617 else if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
59556548 1618 if (starts_with(ref->name, "refs/tags/"))
631b5ef2 1619 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
75e5c0dc 1620 else if (!has_sha1_file(ref->old_sha1))
631b5ef2 1621 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
75e5c0dc
JH
1622 else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1623 !lookup_commit_reference_gently(ref->new_sha1, 1))
631b5ef2 1624 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
75e5c0dc 1625 else if (!ref_newer(ref->new_sha1, ref->old_sha1))
631b5ef2 1626 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
20e8b465 1627 }
631b5ef2
JH
1628
1629 /*
1630 * "--force" will defeat any rejection implemented
1631 * by the rules above.
1632 */
1633 if (!force_ref_update)
1634 ref->status = reject_reason;
1635 else if (reject_reason)
1636 ref->forced_update = 1;
20e8b465
TRC
1637 }
1638}
1639
05e73682
JH
1640static void set_merge(struct branch *ret)
1641{
9e3751d4 1642 struct remote *remote;
05e73682
JH
1643 char *ref;
1644 unsigned char sha1[20];
1645 int i;
1646
ee2499fe
JK
1647 if (!ret)
1648 return; /* no branch */
1649 if (ret->merge)
1650 return; /* already run */
1651 if (!ret->remote_name || !ret->merge_nr) {
1652 /*
1653 * no merge config; let's make sure we don't confuse callers
1654 * with a non-zero merge_nr but a NULL merge
1655 */
1656 ret->merge_nr = 0;
1657 return;
1658 }
1659
9e3751d4
JK
1660 remote = remote_get(ret->remote_name);
1661
05e73682
JH
1662 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1663 for (i = 0; i < ret->merge_nr; i++) {
1664 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1665 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
9e3751d4 1666 if (!remote_find_tracking(remote, ret->merge[i]) ||
05e73682
JH
1667 strcmp(ret->remote_name, "."))
1668 continue;
1669 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1670 sha1, &ref) == 1)
1671 ret->merge[i]->dst = ref;
1672 else
1673 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1674 }
1675}
1676
cf818348
DB
1677struct branch *branch_get(const char *name)
1678{
1679 struct branch *ret;
1680
1681 read_config();
1682 if (!name || !*name || !strcmp(name, "HEAD"))
1683 ret = current_branch;
1684 else
1685 ret = make_branch(name, 0);
ee2499fe 1686 set_merge(ret);
cf818348
DB
1687 return ret;
1688}
1689
1690int branch_has_merge_config(struct branch *branch)
1691{
1692 return branch && !!branch->merge;
1693}
1694
85682c19
SP
1695int branch_merge_matches(struct branch *branch,
1696 int i,
1697 const char *refname)
cf818348 1698{
85682c19 1699 if (!branch || i < 0 || i >= branch->merge_nr)
cf818348 1700 return 0;
54457fe5 1701 return refname_match(branch->merge[i]->src, refname);
cf818348 1702}
d71ab174 1703
f8fb971e
JH
1704static int ignore_symref_update(const char *refname)
1705{
1706 unsigned char sha1[20];
1707 int flag;
1708
7695d118 1709 if (!resolve_ref_unsafe(refname, 0, sha1, &flag))
f8fb971e
JH
1710 return 0; /* non-existing refs are OK */
1711 return (flag & REF_ISSYMREF);
1712}
1713
f166db26
MH
1714/*
1715 * Create and return a list of (struct ref) consisting of copies of
1716 * each remote_ref that matches refspec. refspec must be a pattern.
1717 * Fill in the copies' peer_ref to describe the local tracking refs to
1718 * which they map. Omit any references that would map to an existing
1719 * local symbolic ref.
1720 */
4577370e 1721static struct ref *get_expanded_map(const struct ref *remote_refs,
d71ab174
DB
1722 const struct refspec *refspec)
1723{
4577370e 1724 const struct ref *ref;
d71ab174
DB
1725 struct ref *ret = NULL;
1726 struct ref **tail = &ret;
1727
d71ab174 1728 for (ref = remote_refs; ref; ref = ref->next) {
e31a17f7
MH
1729 char *expn_name = NULL;
1730
d71ab174
DB
1731 if (strchr(ref->name, '^'))
1732 continue; /* a dereference item */
e928213f 1733 if (match_name_with_pattern(refspec->src, ref->name,
f8fb971e
JH
1734 refspec->dst, &expn_name) &&
1735 !ignore_symref_update(expn_name)) {
d71ab174 1736 struct ref *cpy = copy_ref(ref);
d71ab174 1737
e928213f 1738 cpy->peer_ref = alloc_ref(expn_name);
d71ab174
DB
1739 if (refspec->force)
1740 cpy->peer_ref->force = 1;
1741 *tail = cpy;
1742 tail = &cpy->next;
1743 }
e31a17f7 1744 free(expn_name);
d71ab174
DB
1745 }
1746
1747 return ret;
1748}
1749
4577370e 1750static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
d71ab174 1751{
4577370e 1752 const struct ref *ref;
d71ab174 1753 for (ref = refs; ref; ref = ref->next) {
54457fe5 1754 if (refname_match(name, ref->name))
d71ab174
DB
1755 return ref;
1756 }
1757 return NULL;
1758}
1759
4577370e 1760struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
d71ab174 1761{
4577370e 1762 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
d71ab174
DB
1763
1764 if (!ref)
9ad7c5ae 1765 return NULL;
d71ab174
DB
1766
1767 return copy_ref(ref);
1768}
1769
1770static struct ref *get_local_ref(const char *name)
1771{
3eb96997 1772 if (!name || name[0] == '\0')
d71ab174
DB
1773 return NULL;
1774
59556548 1775 if (starts_with(name, "refs/"))
59c69c0c 1776 return alloc_ref(name);
d71ab174 1777
59556548
CC
1778 if (starts_with(name, "heads/") ||
1779 starts_with(name, "tags/") ||
1780 starts_with(name, "remotes/"))
8009768e 1781 return alloc_ref_with_prefix("refs/", 5, name);
d71ab174 1782
8009768e 1783 return alloc_ref_with_prefix("refs/heads/", 11, name);
d71ab174
DB
1784}
1785
4577370e 1786int get_fetch_map(const struct ref *remote_refs,
d71ab174 1787 const struct refspec *refspec,
9ad7c5ae
JH
1788 struct ref ***tail,
1789 int missing_ok)
d71ab174 1790{
ef00d150 1791 struct ref *ref_map, **rmp;
d71ab174
DB
1792
1793 if (refspec->pattern) {
1794 ref_map = get_expanded_map(remote_refs, refspec);
1795 } else {
9ad7c5ae
JH
1796 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1797
6e7b66ee
JH
1798 if (refspec->exact_sha1) {
1799 ref_map = alloc_ref(name);
1800 get_sha1_hex(name, ref_map->old_sha1);
1801 } else {
1802 ref_map = get_remote_ref(remote_refs, name);
1803 }
9ad7c5ae
JH
1804 if (!missing_ok && !ref_map)
1805 die("Couldn't find remote ref %s", name);
1806 if (ref_map) {
1807 ref_map->peer_ref = get_local_ref(refspec->dst);
1808 if (ref_map->peer_ref && refspec->force)
1809 ref_map->peer_ref->force = 1;
1810 }
d71ab174
DB
1811 }
1812
ef00d150
DB
1813 for (rmp = &ref_map; *rmp; ) {
1814 if ((*rmp)->peer_ref) {
59556548 1815 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
5c08c1f2 1816 check_refname_format((*rmp)->peer_ref->name, 0)) {
ef00d150
DB
1817 struct ref *ignore = *rmp;
1818 error("* Ignoring funny ref '%s' locally",
1819 (*rmp)->peer_ref->name);
1820 *rmp = (*rmp)->next;
1821 free(ignore->peer_ref);
1822 free(ignore);
1823 continue;
1824 }
1825 }
1826 rmp = &((*rmp)->next);
d71ab174
DB
1827 }
1828
8f70a765
AR
1829 if (ref_map)
1830 tail_link_ref(ref_map, tail);
d71ab174
DB
1831
1832 return 0;
1833}
be885d96
DB
1834
1835int resolve_remote_symref(struct ref *ref, struct ref *list)
1836{
1837 if (!ref->symref)
1838 return 0;
1839 for (; list; list = list->next)
1840 if (!strcmp(ref->symref, list->name)) {
1841 hashcpy(ref->old_sha1, list->old_sha1);
1842 return 0;
1843 }
1844 return 1;
1845}
6d21bf96 1846
ec8452d5
JS
1847static void unmark_and_free(struct commit_list *list, unsigned int mark)
1848{
1849 while (list) {
1850 struct commit_list *temp = list;
1851 temp->item->object.flags &= ~mark;
1852 list = temp->next;
1853 free(temp);
1854 }
1855}
1856
1857int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1858{
1859 struct object *o;
1860 struct commit *old, *new;
1861 struct commit_list *list, *used;
1862 int found = 0;
1863
75e5c0dc
JH
1864 /*
1865 * Both new and old must be commit-ish and new is descendant of
ec8452d5
JS
1866 * old. Otherwise we require --force.
1867 */
1868 o = deref_tag(parse_object(old_sha1), NULL, 0);
1869 if (!o || o->type != OBJ_COMMIT)
1870 return 0;
1871 old = (struct commit *) o;
1872
1873 o = deref_tag(parse_object(new_sha1), NULL, 0);
1874 if (!o || o->type != OBJ_COMMIT)
1875 return 0;
1876 new = (struct commit *) o;
1877
1878 if (parse_commit(new) < 0)
1879 return 0;
1880
1881 used = list = NULL;
1882 commit_list_insert(new, &list);
1883 while (list) {
1884 new = pop_most_recent_commit(&list, TMP_MARK);
1885 commit_list_insert(new, &used);
1886 if (new == old) {
1887 found = 1;
1888 break;
1889 }
1890 }
1891 unmark_and_free(list, TMP_MARK);
1892 unmark_and_free(used, TMP_MARK);
1893 return found;
1894}
1895
6d21bf96 1896/*
f2e08739
JX
1897 * Compare a branch with its upstream, and save their differences (number
1898 * of commits) in *num_ours and *num_theirs.
1899 *
1900 * Return 0 if branch has no upstream (no base), -1 if upstream is missing
1901 * (with "gone" base), otherwise 1 (with base).
6d21bf96
JH
1902 */
1903int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1904{
1905 unsigned char sha1[20];
1906 struct commit *ours, *theirs;
1907 char symmetric[84];
1908 struct rev_info revs;
1909 const char *rev_argv[10], *base;
1910 int rev_argc;
1911
f2e08739 1912 /* Cannot stat unless we are marked to build on top of somebody else. */
6d21bf96
JH
1913 if (!branch ||
1914 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1915 return 0;
1916
f2e08739 1917 /* Cannot stat if what we used to build on no longer exists */
6d21bf96 1918 base = branch->merge[0]->dst;
c6893323 1919 if (read_ref(base, sha1))
f2e08739 1920 return -1;
57ffc5f8 1921 theirs = lookup_commit_reference(sha1);
6d21bf96 1922 if (!theirs)
f2e08739 1923 return -1;
6d21bf96 1924
c6893323 1925 if (read_ref(branch->refname, sha1))
f2e08739 1926 return -1;
57ffc5f8 1927 ours = lookup_commit_reference(sha1);
6d21bf96 1928 if (!ours)
f2e08739 1929 return -1;
6d21bf96
JH
1930
1931 /* are we the same? */
f2e08739
JX
1932 if (theirs == ours) {
1933 *num_theirs = *num_ours = 0;
1934 return 1;
1935 }
6d21bf96 1936
8fbf879e 1937 /* Run "rev-list --left-right ours...theirs" internally... */
6d21bf96
JH
1938 rev_argc = 0;
1939 rev_argv[rev_argc++] = NULL;
1940 rev_argv[rev_argc++] = "--left-right";
1941 rev_argv[rev_argc++] = symmetric;
1942 rev_argv[rev_argc++] = "--";
1943 rev_argv[rev_argc] = NULL;
1944
1945 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1946 strcpy(symmetric + 40, "...");
1947 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1948
1949 init_revisions(&revs, NULL);
1950 setup_revisions(rev_argc, rev_argv, &revs, NULL);
81c3ce3c
SB
1951 if (prepare_revision_walk(&revs))
1952 die("revision walk setup failed");
6d21bf96
JH
1953
1954 /* ... and count the commits on each side. */
1955 *num_ours = 0;
1956 *num_theirs = 0;
1957 while (1) {
1958 struct commit *c = get_revision(&revs);
1959 if (!c)
1960 break;
1961 if (c->object.flags & SYMMETRIC_LEFT)
1962 (*num_ours)++;
1963 else
1964 (*num_theirs)++;
1965 }
c0234b2e
JH
1966
1967 /* clear object flags smudged by the above traversal */
1968 clear_commit_marks(ours, ALL_REV_FLAGS);
1969 clear_commit_marks(theirs, ALL_REV_FLAGS);
6d21bf96
JH
1970 return 1;
1971}
1972
1973/*
1974 * Return true when there is anything to report, otherwise false.
1975 */
1976int format_tracking_info(struct branch *branch, struct strbuf *sb)
1977{
f2e08739 1978 int ours, theirs;
2f50babe 1979 char *base;
f2e08739 1980 int upstream_is_gone = 0;
6d21bf96 1981
f2e08739
JX
1982 switch (stat_tracking_info(branch, &ours, &theirs)) {
1983 case 0:
1984 /* no base */
6d21bf96 1985 return 0;
f2e08739
JX
1986 case -1:
1987 /* with "gone" base */
1988 upstream_is_gone = 1;
1989 break;
1990 default:
f2e08739
JX
1991 /* with base */
1992 break;
1993 }
6d21bf96 1994
2f50babe 1995 base = shorten_unambiguous_ref(branch->merge[0]->dst, 0);
f2e08739
JX
1996 if (upstream_is_gone) {
1997 strbuf_addf(sb,
1998 _("Your branch is based on '%s', but the upstream is gone.\n"),
1999 base);
2000 if (advice_status_hints)
2001 strbuf_addf(sb,
2002 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
f223459b
JX
2003 } else if (!ours && !theirs) {
2004 strbuf_addf(sb,
2005 _("Your branch is up-to-date with '%s'.\n"),
2006 base);
f2e08739 2007 } else if (!theirs) {
8a5b7494
JX
2008 strbuf_addf(sb,
2009 Q_("Your branch is ahead of '%s' by %d commit.\n",
2010 "Your branch is ahead of '%s' by %d commits.\n",
f2e08739
JX
2011 ours),
2012 base, ours);
491e3075
JK
2013 if (advice_status_hints)
2014 strbuf_addf(sb,
2015 _(" (use \"git push\" to publish your local commits)\n"));
f2e08739 2016 } else if (!ours) {
8a5b7494
JX
2017 strbuf_addf(sb,
2018 Q_("Your branch is behind '%s' by %d commit, "
2019 "and can be fast-forwarded.\n",
2020 "Your branch is behind '%s' by %d commits, "
2021 "and can be fast-forwarded.\n",
f2e08739
JX
2022 theirs),
2023 base, theirs);
491e3075
JK
2024 if (advice_status_hints)
2025 strbuf_addf(sb,
2026 _(" (use \"git pull\" to update your local branch)\n"));
c190ced6 2027 } else {
8a5b7494
JX
2028 strbuf_addf(sb,
2029 Q_("Your branch and '%s' have diverged,\n"
2030 "and have %d and %d different commit each, "
2031 "respectively.\n",
2032 "Your branch and '%s' have diverged,\n"
2033 "and have %d and %d different commits each, "
2034 "respectively.\n",
f2e08739
JX
2035 theirs),
2036 base, ours, theirs);
491e3075
JK
2037 if (advice_status_hints)
2038 strbuf_addf(sb,
2039 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
c190ced6 2040 }
2f50babe 2041 free(base);
6d21bf96
JH
2042 return 1;
2043}
454e2025
JS
2044
2045static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
2046{
2047 struct ref ***local_tail = cb_data;
2048 struct ref *ref;
2049 int len;
2050
2051 /* we already know it starts with refs/ to get here */
8d9c5010 2052 if (check_refname_format(refname + 5, 0))
454e2025
JS
2053 return 0;
2054
2055 len = strlen(refname) + 1;
2056 ref = xcalloc(1, sizeof(*ref) + len);
2057 hashcpy(ref->new_sha1, sha1);
2058 memcpy(ref->name, refname, len);
2059 **local_tail = ref;
2060 *local_tail = &ref->next;
2061 return 0;
2062}
2063
2064struct ref *get_local_heads(void)
2065{
55f0566f 2066 struct ref *local_refs = NULL, **local_tail = &local_refs;
454e2025
JS
2067 for_each_ref(one_local_ref, &local_tail);
2068 return local_refs;
2069}
8ef51733 2070
4229f1fa
JS
2071struct ref *guess_remote_head(const struct ref *head,
2072 const struct ref *refs,
2073 int all)
8ef51733 2074{
8ef51733 2075 const struct ref *r;
4229f1fa
JS
2076 struct ref *list = NULL;
2077 struct ref **tail = &list;
8ef51733 2078
6cb4e6cc 2079 if (!head)
8ef51733
JS
2080 return NULL;
2081
fbb074c2
JK
2082 /*
2083 * Some transports support directly peeking at
2084 * where HEAD points; if that is the case, then
2085 * we don't have to guess.
2086 */
2087 if (head->symref)
2088 return copy_ref(find_ref_by_name(refs, head->symref));
2089
8ef51733 2090 /* If refs/heads/master could be right, it is. */
4229f1fa
JS
2091 if (!all) {
2092 r = find_ref_by_name(refs, "refs/heads/master");
2093 if (r && !hashcmp(r->old_sha1, head->old_sha1))
2094 return copy_ref(r);
2095 }
8ef51733
JS
2096
2097 /* Look for another ref that points there */
4229f1fa 2098 for (r = refs; r; r = r->next) {
61adfd30 2099 if (r != head &&
59556548 2100 starts_with(r->name, "refs/heads/") &&
61adfd30 2101 !hashcmp(r->old_sha1, head->old_sha1)) {
4229f1fa
JS
2102 *tail = copy_ref(r);
2103 tail = &((*tail)->next);
2104 if (!all)
2105 break;
2106 }
2107 }
8ef51733 2108
4229f1fa 2109 return list;
8ef51733 2110}
f2ef6075
JS
2111
2112struct stale_heads_info {
f2ef6075
JS
2113 struct string_list *ref_names;
2114 struct ref **stale_refs_tail;
ed43de6e
CMN
2115 struct refspec *refs;
2116 int ref_count;
f2ef6075
JS
2117};
2118
2119static int get_stale_heads_cb(const char *refname,
2120 const unsigned char *sha1, int flags, void *cb_data)
2121{
2122 struct stale_heads_info *info = cb_data;
e6f63712 2123 struct string_list matches = STRING_LIST_INIT_DUP;
ed43de6e 2124 struct refspec query;
e6f63712 2125 int i, stale = 1;
ed43de6e
CMN
2126 memset(&query, 0, sizeof(struct refspec));
2127 query.dst = (char *)refname;
2128
e6f63712
CMN
2129 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2130 if (matches.nr == 0)
2131 goto clean_exit; /* No matches */
ed43de6e
CMN
2132
2133 /*
2134 * If we did find a suitable refspec and it's not a symref and
2135 * it's not in the list of refs that currently exist in that
e6f63712
CMN
2136 * remote, we consider it to be stale. In order to deal with
2137 * overlapping refspecs, we need to go over all of the
2138 * matching refs.
ed43de6e 2139 */
e6f63712
CMN
2140 if (flags & REF_ISSYMREF)
2141 goto clean_exit;
2142
2143 for (i = 0; stale && i < matches.nr; i++)
2144 if (string_list_has_string(info->ref_names, matches.items[i].string))
2145 stale = 0;
2146
2147 if (stale) {
ed43de6e
CMN
2148 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2149 hashcpy(ref->new_sha1, sha1);
f2ef6075 2150 }
ed43de6e 2151
e6f63712
CMN
2152clean_exit:
2153 string_list_clear(&matches, 0);
f2ef6075
JS
2154 return 0;
2155}
2156
ed43de6e 2157struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
f2ef6075
JS
2158{
2159 struct ref *ref, *stale_refs = NULL;
183113a5 2160 struct string_list ref_names = STRING_LIST_INIT_NODUP;
f2ef6075 2161 struct stale_heads_info info;
f2ef6075
JS
2162 info.ref_names = &ref_names;
2163 info.stale_refs_tail = &stale_refs;
ed43de6e
CMN
2164 info.refs = refs;
2165 info.ref_count = ref_count;
f2ef6075 2166 for (ref = fetch_map; ref; ref = ref->next)
1d2f80fa 2167 string_list_append(&ref_names, ref->name);
3383e199 2168 string_list_sort(&ref_names);
f2ef6075
JS
2169 for_each_ref(get_stale_heads_cb, &info);
2170 string_list_clear(&ref_names, 0);
2171 return stale_refs;
2172}
28f5d176
JH
2173
2174/*
2175 * Compare-and-swap
2176 */
a355b11d 2177static void clear_cas_option(struct push_cas_option *cas)
28f5d176
JH
2178{
2179 int i;
2180
2181 for (i = 0; i < cas->nr; i++)
2182 free(cas->entry[i].refname);
2183 free(cas->entry);
2184 memset(cas, 0, sizeof(*cas));
2185}
2186
2187static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2188 const char *refname,
2189 size_t refnamelen)
2190{
2191 struct push_cas *entry;
2192 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2193 entry = &cas->entry[cas->nr++];
2194 memset(entry, 0, sizeof(*entry));
2195 entry->refname = xmemdupz(refname, refnamelen);
2196 return entry;
2197}
2198
2199int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2200{
2201 const char *colon;
2202 struct push_cas *entry;
2203
2204 if (unset) {
2205 /* "--no-<option>" */
2206 clear_cas_option(cas);
2207 return 0;
2208 }
2209
2210 if (!arg) {
2211 /* just "--<option>" */
2212 cas->use_tracking_for_rest = 1;
2213 return 0;
2214 }
2215
2216 /* "--<option>=refname" or "--<option>=refname:value" */
2217 colon = strchrnul(arg, ':');
2218 entry = add_cas_entry(cas, arg, colon - arg);
2219 if (!*colon)
2220 entry->use_tracking = 1;
2221 else if (get_sha1(colon + 1, entry->expect))
2222 return error("cannot parse expected object name '%s'", colon + 1);
2223 return 0;
2224}
2225
2226int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2227{
2228 return parse_push_cas_option(opt->value, arg, unset);
2229}
91048a95
JH
2230
2231int is_empty_cas(const struct push_cas_option *cas)
2232{
2233 return !cas->use_tracking_for_rest && !cas->nr;
2234}
2235
2236/*
2237 * Look at remote.fetch refspec and see if we have a remote
2238 * tracking branch for the refname there. Fill its current
2239 * value in sha1[].
2240 * If we cannot do so, return negative to signal an error.
2241 */
2242static int remote_tracking(struct remote *remote, const char *refname,
2243 unsigned char sha1[20])
2244{
2245 char *dst;
2246
2247 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2248 if (!dst)
2249 return -1; /* no tracking ref for refname at remote */
2250 if (read_ref(dst, sha1))
2251 return -1; /* we know what the tracking ref is but we cannot read it */
2252 return 0;
2253}
2254
2255static void apply_cas(struct push_cas_option *cas,
2256 struct remote *remote,
2257 struct ref *ref)
2258{
2259 int i;
2260
2261 /* Find an explicit --<option>=<name>[:<value>] entry */
2262 for (i = 0; i < cas->nr; i++) {
2263 struct push_cas *entry = &cas->entry[i];
54457fe5 2264 if (!refname_match(entry->refname, ref->name))
91048a95
JH
2265 continue;
2266 ref->expect_old_sha1 = 1;
2267 if (!entry->use_tracking)
2268 hashcpy(ref->old_sha1_expect, cas->entry[i].expect);
2269 else if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2270 ref->expect_old_no_trackback = 1;
2271 return;
2272 }
2273
2274 /* Are we using "--<option>" to cover all? */
2275 if (!cas->use_tracking_for_rest)
2276 return;
2277
2278 ref->expect_old_sha1 = 1;
2279 if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2280 ref->expect_old_no_trackback = 1;
2281}
2282
2283void apply_push_cas(struct push_cas_option *cas,
2284 struct remote *remote,
2285 struct ref *remote_refs)
2286{
2287 struct ref *ref;
2288 for (ref = remote_refs; ref; ref = ref->next)
2289 apply_cas(cas, remote, ref);
2290}