upload-pack: optionally allow fetching from the tips of hidden refs
[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,
08fbdb30
DB
18 "refs/tags/*",
19 "refs/tags/*"
e0aaa29f
DB
20};
21
22const struct refspec *tag_refspec = &s_tag_refspec;
23
844112ca
JH
24struct counted_string {
25 size_t len;
26 const char *s;
27};
55029ae4
DB
28struct rewrite {
29 const char *base;
844112ca
JH
30 size_t baselen;
31 struct counted_string *instead_of;
55029ae4
DB
32 int instead_of_nr;
33 int instead_of_alloc;
34};
d071d942
JT
35struct rewrites {
36 struct rewrite **rewrite;
37 int rewrite_alloc;
38 int rewrite_nr;
39};
55029ae4 40
5751f490 41static struct remote **remotes;
2d31347b
DB
42static int remotes_alloc;
43static int remotes_nr;
5751f490 44
cf818348 45static struct branch **branches;
2d31347b
DB
46static int branches_alloc;
47static int branches_nr;
cf818348
DB
48
49static struct branch *current_branch;
50static const char *default_remote_name;
fa685bdf 51static int explicit_default_remote_name;
cf818348 52
d071d942 53static struct rewrites rewrites;
1c2eafb8 54static struct rewrites rewrites_push;
55029ae4 55
5751f490
DB
56#define BUF_SIZE (2048)
57static char buffer[BUF_SIZE];
58
0a4da29d
DB
59static int valid_remote(const struct remote *remote)
60{
c578f51d 61 return (!!remote->url) || (!!remote->foreign_vcs);
0a4da29d
DB
62}
63
d071d942 64static const char *alias_url(const char *url, struct rewrites *r)
55029ae4
DB
65{
66 int i, j;
844112ca
JH
67 char *ret;
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
JT
76 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
77 if (!prefixcmp(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
d071d942 88 ret = xmalloc(r->rewrite[longest_i]->baselen +
844112ca 89 (strlen(url) - longest->len) + 1);
d071d942
JT
90 strcpy(ret, r->rewrite[longest_i]->base);
91 strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
844112ca 92 return ret;
55029ae4
DB
93}
94
5751f490
DB
95static void add_push_refspec(struct remote *remote, const char *ref)
96{
2d31347b
DB
97 ALLOC_GROW(remote->push_refspec,
98 remote->push_refspec_nr + 1,
99 remote->push_refspec_alloc);
100 remote->push_refspec[remote->push_refspec_nr++] = ref;
5751f490
DB
101}
102
5d46c9d4
DB
103static void add_fetch_refspec(struct remote *remote, const char *ref)
104{
2d31347b
DB
105 ALLOC_GROW(remote->fetch_refspec,
106 remote->fetch_refspec_nr + 1,
107 remote->fetch_refspec_alloc);
108 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
5d46c9d4
DB
109}
110
28b91f8a 111static void add_url(struct remote *remote, const char *url)
5751f490 112{
2d31347b
DB
113 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
114 remote->url[remote->url_nr++] = url;
5751f490
DB
115}
116
20346234
MG
117static void add_pushurl(struct remote *remote, const char *pushurl)
118{
119 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
120 remote->pushurl[remote->pushurl_nr++] = pushurl;
121}
122
1c2eafb8
JT
123static void add_pushurl_alias(struct remote *remote, const char *url)
124{
125 const char *pushurl = alias_url(url, &rewrites_push);
126 if (pushurl != url)
127 add_pushurl(remote, pushurl);
128}
129
130static void add_url_alias(struct remote *remote, const char *url)
131{
132 add_url(remote, alias_url(url, &rewrites));
133 add_pushurl_alias(remote, url);
134}
135
5751f490
DB
136static struct remote *make_remote(const char *name, int len)
137{
2d31347b
DB
138 struct remote *ret;
139 int i;
5751f490 140
2d31347b
DB
141 for (i = 0; i < remotes_nr; i++) {
142 if (len ? (!strncmp(name, remotes[i]->name, len) &&
143 !remotes[i]->name[len]) :
144 !strcmp(name, remotes[i]->name))
145 return remotes[i];
5751f490
DB
146 }
147
2d31347b
DB
148 ret = xcalloc(1, sizeof(struct remote));
149 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
150 remotes[remotes_nr++] = ret;
5751f490 151 if (len)
2d31347b 152 ret->name = xstrndup(name, len);
5751f490 153 else
2d31347b
DB
154 ret->name = xstrdup(name);
155 return ret;
5751f490
DB
156}
157
cf818348
DB
158static void add_merge(struct branch *branch, const char *name)
159{
2d31347b
DB
160 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
161 branch->merge_alloc);
162 branch->merge_name[branch->merge_nr++] = name;
cf818348
DB
163}
164
165static struct branch *make_branch(const char *name, int len)
166{
2d31347b
DB
167 struct branch *ret;
168 int i;
cf818348
DB
169 char *refname;
170
2d31347b
DB
171 for (i = 0; i < branches_nr; i++) {
172 if (len ? (!strncmp(name, branches[i]->name, len) &&
173 !branches[i]->name[len]) :
174 !strcmp(name, branches[i]->name))
175 return branches[i];
cf818348
DB
176 }
177
2d31347b
DB
178 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
179 ret = xcalloc(1, sizeof(struct branch));
180 branches[branches_nr++] = ret;
cf818348 181 if (len)
2d31347b 182 ret->name = xstrndup(name, len);
cf818348 183 else
2d31347b 184 ret->name = xstrdup(name);
e8eec71d 185 refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
cf818348 186 strcpy(refname, "refs/heads/");
2d31347b
DB
187 strcpy(refname + strlen("refs/heads/"), ret->name);
188 ret->refname = refname;
cf818348 189
2d31347b 190 return ret;
cf818348
DB
191}
192
d071d942 193static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
55029ae4
DB
194{
195 struct rewrite *ret;
196 int i;
197
d071d942 198 for (i = 0; i < r->rewrite_nr; i++) {
844112ca 199 if (len
d071d942
JT
200 ? (len == r->rewrite[i]->baselen &&
201 !strncmp(base, r->rewrite[i]->base, len))
202 : !strcmp(base, r->rewrite[i]->base))
203 return r->rewrite[i];
55029ae4
DB
204 }
205
d071d942 206 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
55029ae4 207 ret = xcalloc(1, sizeof(struct rewrite));
d071d942 208 r->rewrite[r->rewrite_nr++] = ret;
844112ca 209 if (len) {
55029ae4 210 ret->base = xstrndup(base, len);
844112ca
JH
211 ret->baselen = len;
212 }
213 else {
55029ae4 214 ret->base = xstrdup(base);
844112ca
JH
215 ret->baselen = strlen(base);
216 }
55029ae4
DB
217 return ret;
218}
219
220static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
221{
222 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
844112ca
JH
223 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
224 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
225 rewrite->instead_of_nr++;
55029ae4
DB
226}
227
5751f490
DB
228static void read_remotes_file(struct remote *remote)
229{
230 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
231
232 if (!f)
233 return;
89cf4c70 234 remote->origin = REMOTE_REMOTES;
5751f490
DB
235 while (fgets(buffer, BUF_SIZE, f)) {
236 int value_list;
237 char *s, *p;
238
239 if (!prefixcmp(buffer, "URL:")) {
240 value_list = 0;
241 s = buffer + 4;
242 } else if (!prefixcmp(buffer, "Push:")) {
243 value_list = 1;
244 s = buffer + 5;
5d46c9d4
DB
245 } else if (!prefixcmp(buffer, "Pull:")) {
246 value_list = 2;
247 s = buffer + 5;
5751f490
DB
248 } else
249 continue;
250
251 while (isspace(*s))
252 s++;
253 if (!*s)
254 continue;
255
256 p = s + strlen(s);
257 while (isspace(p[-1]))
258 *--p = 0;
259
260 switch (value_list) {
261 case 0:
55029ae4 262 add_url_alias(remote, xstrdup(s));
5751f490
DB
263 break;
264 case 1:
265 add_push_refspec(remote, xstrdup(s));
266 break;
5d46c9d4
DB
267 case 2:
268 add_fetch_refspec(remote, xstrdup(s));
269 break;
5751f490
DB
270 }
271 }
272 fclose(f);
273}
274
275static void read_branches_file(struct remote *remote)
276{
277 const char *slash = strchr(remote->name, '/');
cf818348 278 char *frag;
f285a2d7 279 struct strbuf branch = STRBUF_INIT;
5751f490
DB
280 int n = slash ? slash - remote->name : 1000;
281 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
282 char *s, *p;
283 int len;
284
285 if (!f)
286 return;
287 s = fgets(buffer, BUF_SIZE, f);
288 fclose(f);
289 if (!s)
290 return;
291 while (isspace(*s))
292 s++;
293 if (!*s)
294 return;
89cf4c70 295 remote->origin = REMOTE_BRANCHES;
5751f490
DB
296 p = s + strlen(s);
297 while (isspace(p[-1]))
298 *--p = 0;
299 len = p - s;
300 if (slash)
301 len += strlen(slash);
302 p = xmalloc(len + 1);
303 strcpy(p, s);
304 if (slash)
305 strcat(p, slash);
472fa4cd
DB
306
307 /*
308 * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
309 * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
310 * the partial URL obtained from the branches file plus
311 * "/netdev-2.6" and does not store it in any tracking ref.
312 * #branch specifier in the file is ignored.
313 *
314 * Otherwise, the branches file would have URL and optionally
315 * #branch specified. The "master" (or specified) branch is
316 * fetched and stored in the local branch of the same name.
317 */
cf818348
DB
318 frag = strchr(p, '#');
319 if (frag) {
320 *(frag++) = '\0';
472fa4cd
DB
321 strbuf_addf(&branch, "refs/heads/%s", frag);
322 } else
323 strbuf_addstr(&branch, "refs/heads/master");
324 if (!slash) {
325 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
cf818348 326 } else {
472fa4cd
DB
327 strbuf_reset(&branch);
328 strbuf_addstr(&branch, "HEAD:");
cf818348 329 }
55029ae4 330 add_url_alias(remote, p);
2af202be 331 add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
18afe101
MK
332 /*
333 * Cogito compatible push: push current HEAD to remote #branch
334 * (master if missing)
335 */
336 strbuf_init(&branch, 0);
337 strbuf_addstr(&branch, "HEAD");
338 if (frag)
339 strbuf_addf(&branch, ":refs/heads/%s", frag);
340 else
341 strbuf_addstr(&branch, ":refs/heads/master");
2af202be 342 add_push_refspec(remote, strbuf_detach(&branch, NULL));
d71ab174 343 remote->fetch_tags = 1; /* always auto-follow */
5751f490
DB
344}
345
ef90d6d4 346static int handle_config(const char *key, const char *value, void *cb)
5751f490
DB
347{
348 const char *name;
349 const char *subkey;
350 struct remote *remote;
cf818348
DB
351 struct branch *branch;
352 if (!prefixcmp(key, "branch.")) {
353 name = key + 7;
354 subkey = strrchr(name, '.');
cf818348
DB
355 if (!subkey)
356 return 0;
896c0535 357 branch = make_branch(name, subkey - name);
cf818348 358 if (!strcmp(subkey, ".remote")) {
d2370cc2
JH
359 if (!value)
360 return config_error_nonbool(key);
cf818348 361 branch->remote_name = xstrdup(value);
fa685bdf 362 if (branch == current_branch) {
cf818348 363 default_remote_name = branch->remote_name;
fa685bdf
DB
364 explicit_default_remote_name = 1;
365 }
d2370cc2
JH
366 } else if (!strcmp(subkey, ".merge")) {
367 if (!value)
368 return config_error_nonbool(key);
cf818348 369 add_merge(branch, xstrdup(value));
d2370cc2 370 }
cf818348 371 return 0;
5751f490 372 }
55029ae4
DB
373 if (!prefixcmp(key, "url.")) {
374 struct rewrite *rewrite;
60e3aba9 375 name = key + 4;
55029ae4
DB
376 subkey = strrchr(name, '.');
377 if (!subkey)
378 return 0;
55029ae4 379 if (!strcmp(subkey, ".insteadof")) {
1c2eafb8
JT
380 rewrite = make_rewrite(&rewrites, name, subkey - name);
381 if (!value)
382 return config_error_nonbool(key);
383 add_instead_of(rewrite, xstrdup(value));
384 } else if (!strcmp(subkey, ".pushinsteadof")) {
385 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
55029ae4
DB
386 if (!value)
387 return config_error_nonbool(key);
388 add_instead_of(rewrite, xstrdup(value));
389 }
390 }
5751f490
DB
391 if (prefixcmp(key, "remote."))
392 return 0;
393 name = key + 7;
c82efafc
BC
394 if (*name == '/') {
395 warning("Config remote shorthand cannot begin with '/': %s",
396 name);
397 return 0;
398 }
5751f490
DB
399 subkey = strrchr(name, '.');
400 if (!subkey)
cd294bc3 401 return 0;
5751f490 402 remote = make_remote(name, subkey - name);
89cf4c70 403 remote->origin = REMOTE_CONFIG;
84bb2dfd
PB
404 if (!strcmp(subkey, ".mirror"))
405 remote->mirror = git_config_bool(key, value);
406 else if (!strcmp(subkey, ".skipdefaultupdate"))
407 remote->skip_default_update = git_config_bool(key, value);
7cc91a2f
BG
408 else if (!strcmp(subkey, ".skipfetchall"))
409 remote->skip_default_update = git_config_bool(key, value);
84bb2dfd
PB
410 else if (!strcmp(subkey, ".url")) {
411 const char *v;
412 if (git_config_string(&v, key, value))
413 return -1;
414 add_url(remote, v);
20346234
MG
415 } else if (!strcmp(subkey, ".pushurl")) {
416 const char *v;
417 if (git_config_string(&v, key, value))
418 return -1;
419 add_pushurl(remote, v);
5751f490 420 } else if (!strcmp(subkey, ".push")) {
84bb2dfd
PB
421 const char *v;
422 if (git_config_string(&v, key, value))
423 return -1;
424 add_push_refspec(remote, v);
5d46c9d4 425 } else if (!strcmp(subkey, ".fetch")) {
84bb2dfd
PB
426 const char *v;
427 if (git_config_string(&v, key, value))
428 return -1;
429 add_fetch_refspec(remote, v);
5751f490 430 } else if (!strcmp(subkey, ".receivepack")) {
84bb2dfd
PB
431 const char *v;
432 if (git_config_string(&v, key, value))
433 return -1;
5751f490 434 if (!remote->receivepack)
84bb2dfd 435 remote->receivepack = v;
5751f490
DB
436 else
437 error("more than one receivepack given, using the first");
0012ba21 438 } else if (!strcmp(subkey, ".uploadpack")) {
84bb2dfd
PB
439 const char *v;
440 if (git_config_string(&v, key, value))
441 return -1;
0012ba21 442 if (!remote->uploadpack)
84bb2dfd 443 remote->uploadpack = v;
0012ba21
DB
444 else
445 error("more than one uploadpack given, using the first");
d71ab174
DB
446 } else if (!strcmp(subkey, ".tagopt")) {
447 if (!strcmp(value, "--no-tags"))
448 remote->fetch_tags = -1;
944163a4
ST
449 else if (!strcmp(value, "--tags"))
450 remote->fetch_tags = 2;
14c98218 451 } else if (!strcmp(subkey, ".proxy")) {
84bb2dfd
PB
452 return git_config_string((const char **)&remote->http_proxy,
453 key, value);
c578f51d
DB
454 } else if (!strcmp(subkey, ".vcs")) {
455 return git_config_string(&remote->foreign_vcs, key, value);
84bb2dfd 456 }
5751f490
DB
457 return 0;
458}
459
55029ae4
DB
460static void alias_all_urls(void)
461{
462 int i, j;
463 for (i = 0; i < remotes_nr; i++) {
1c2eafb8 464 int add_pushurl_aliases;
55029ae4
DB
465 if (!remotes[i])
466 continue;
20346234 467 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
d071d942 468 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
20346234 469 }
1c2eafb8
JT
470 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
471 for (j = 0; j < remotes[i]->url_nr; j++) {
472 if (add_pushurl_aliases)
473 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
474 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
475 }
55029ae4
DB
476 }
477}
478
5751f490
DB
479static void read_config(void)
480{
481 unsigned char sha1[20];
482 const char *head_ref;
483 int flag;
2543d9b6 484 if (default_remote_name) /* did this already */
5751f490
DB
485 return;
486 default_remote_name = xstrdup("origin");
487 current_branch = NULL;
8cad4744 488 head_ref = resolve_ref_unsafe("HEAD", sha1, 0, &flag);
5751f490
DB
489 if (head_ref && (flag & REF_ISSYMREF) &&
490 !prefixcmp(head_ref, "refs/heads/")) {
cf818348
DB
491 current_branch =
492 make_branch(head_ref + strlen("refs/heads/"), 0);
5751f490 493 }
ef90d6d4 494 git_config(handle_config, NULL);
55029ae4 495 alias_all_urls();
5751f490
DB
496}
497
2cb1f36d
BC
498/*
499 * This function frees a refspec array.
500 * Warning: code paths should be checked to ensure that the src
501 * and dst pointers are always freeable pointers as well
502 * as the refspec pointer itself.
503 */
697d7f5d 504static void free_refspecs(struct refspec *refspec, int nr_refspec)
2cb1f36d
BC
505{
506 int i;
507
508 if (!refspec)
509 return;
510
511 for (i = 0; i < nr_refspec; i++) {
512 free(refspec[i].src);
513 free(refspec[i].dst);
514 }
515 free(refspec);
516}
517
24b6177e 518static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
6b62816c
DB
519{
520 int i;
521 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
46220ca1 522
6b62816c 523 for (i = 0; i < nr_refspec; i++) {
47c6ef1c 524 size_t llen;
46220ca1
JH
525 int is_glob;
526 const char *lhs, *rhs;
8d9c5010 527 int flags;
46220ca1 528
8e76bf3f 529 is_glob = 0;
46220ca1
JH
530
531 lhs = refspec[i];
532 if (*lhs == '+') {
6b62816c 533 rs[i].force = 1;
46220ca1 534 lhs++;
6b62816c 535 }
46220ca1
JH
536
537 rhs = strrchr(lhs, ':');
a83619d6
PB
538
539 /*
540 * Before going on, special case ":" (or "+:") as a refspec
def24991 541 * for pushing matching refs.
a83619d6
PB
542 */
543 if (!fetch && rhs == lhs && rhs[1] == '\0') {
544 rs[i].matching = 1;
545 continue;
546 }
547
46220ca1 548 if (rhs) {
47c6ef1c 549 size_t rlen = strlen(++rhs);
abd2bde7 550 is_glob = (1 <= rlen && strchr(rhs, '*'));
08fbdb30 551 rs[i].dst = xstrndup(rhs, rlen);
6b62816c 552 }
ef00d150 553
46220ca1 554 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
abd2bde7 555 if (1 <= llen && memchr(lhs, '*', llen)) {
7d19da46
JH
556 if ((rhs && !is_glob) || (!rhs && fetch))
557 goto invalid;
558 is_glob = 1;
7d19da46
JH
559 } else if (rhs && is_glob) {
560 goto invalid;
ef00d150 561 }
7d19da46 562
46220ca1
JH
563 rs[i].pattern = is_glob;
564 rs[i].src = xstrndup(lhs, llen);
8d9c5010 565 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
46220ca1
JH
566
567 if (fetch) {
def24991 568 /* LHS */
46220ca1 569 if (!*rs[i].src)
def24991
JH
570 ; /* empty is ok; it means "HEAD" */
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
5751f490
DB
669struct remote *remote_get(const char *name)
670{
671 struct remote *ret;
fa685bdf 672 int name_given = 0;
5751f490
DB
673
674 read_config();
fa685bdf
DB
675 if (name)
676 name_given = 1;
677 else {
5751f490 678 name = default_remote_name;
fa685bdf
DB
679 name_given = explicit_default_remote_name;
680 }
9326d494 681
5751f490 682 ret = make_remote(name, 0);
df93e33c 683 if (valid_remote_nick(name)) {
0a4da29d 684 if (!valid_remote(ret))
5751f490 685 read_remotes_file(ret);
0a4da29d 686 if (!valid_remote(ret))
5751f490
DB
687 read_branches_file(ret);
688 }
0a4da29d 689 if (name_given && !valid_remote(ret))
55029ae4 690 add_url_alias(ret, name);
0a4da29d 691 if (!valid_remote(ret))
5751f490 692 return NULL;
46220ca1
JH
693 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
694 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
5751f490
DB
695 return ret;
696}
6b62816c 697
9a23ba33
FAG
698int remote_is_configured(const char *name)
699{
700 int i;
701 read_config();
702
703 for (i = 0; i < remotes_nr; i++)
704 if (!strcmp(name, remotes[i]->name))
705 return 1;
706 return 0;
707}
708
b42f6927
JS
709int for_each_remote(each_remote_fn fn, void *priv)
710{
711 int i, result = 0;
712 read_config();
2d31347b 713 for (i = 0; i < remotes_nr && !result; i++) {
b42f6927
JS
714 struct remote *r = remotes[i];
715 if (!r)
716 continue;
717 if (!r->fetch)
46220ca1
JH
718 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
719 r->fetch_refspec);
b42f6927 720 if (!r->push)
46220ca1
JH
721 r->push = parse_push_refspec(r->push_refspec_nr,
722 r->push_refspec);
b42f6927
JS
723 result = fn(r, priv);
724 }
725 return result;
726}
727
2467a4fa
DB
728void ref_remove_duplicates(struct ref *ref_map)
729{
183113a5 730 struct string_list refs = STRING_LIST_INIT_NODUP;
73cf0822
JP
731 struct string_list_item *item = NULL;
732 struct ref *prev = NULL, *next = NULL;
733 for (; ref_map; prev = ref_map, ref_map = next) {
734 next = ref_map->next;
2467a4fa
DB
735 if (!ref_map->peer_ref)
736 continue;
73cf0822 737
e8c8b713 738 item = string_list_lookup(&refs, ref_map->peer_ref->name);
73cf0822
JP
739 if (item) {
740 if (strcmp(((struct ref *)item->util)->name,
741 ref_map->name))
742 die("%s tracks both %s and %s",
743 ref_map->peer_ref->name,
744 ((struct ref *)item->util)->name,
745 ref_map->name);
746 prev->next = ref_map->next;
747 free(ref_map->peer_ref);
748 free(ref_map);
95c96d48
JP
749 ref_map = prev; /* skip this; we freed it */
750 continue;
2467a4fa 751 }
73cf0822 752
78a395d3 753 item = string_list_insert(&refs, ref_map->peer_ref->name);
73cf0822 754 item->util = ref_map;
2467a4fa 755 }
73cf0822 756 string_list_clear(&refs, 0);
2467a4fa
DB
757}
758
28b91f8a 759int remote_has_url(struct remote *remote, const char *url)
5d46c9d4
DB
760{
761 int i;
28b91f8a
SP
762 for (i = 0; i < remote->url_nr; i++) {
763 if (!strcmp(remote->url[i], url))
5d46c9d4
DB
764 return 1;
765 }
766 return 0;
767}
768
e928213f
DB
769static int match_name_with_pattern(const char *key, const char *name,
770 const char *value, char **result)
a3c84239 771{
08fbdb30
DB
772 const char *kstar = strchr(key, '*');
773 size_t klen;
abd2bde7
DB
774 size_t ksuffixlen;
775 size_t namelen;
08fbdb30
DB
776 int ret;
777 if (!kstar)
778 die("Key '%s' of pattern had no '*'", key);
779 klen = kstar - key;
abd2bde7
DB
780 ksuffixlen = strlen(kstar + 1);
781 namelen = strlen(name);
782 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
783 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
e928213f 784 if (ret && value) {
08fbdb30
DB
785 const char *vstar = strchr(value, '*');
786 size_t vlen;
abd2bde7 787 size_t vsuffixlen;
08fbdb30
DB
788 if (!vstar)
789 die("Value '%s' of pattern has no '*'", value);
790 vlen = vstar - value;
abd2bde7
DB
791 vsuffixlen = strlen(vstar + 1);
792 *result = xmalloc(vlen + vsuffixlen +
e928213f 793 strlen(name) -
abd2bde7
DB
794 klen - ksuffixlen + 1);
795 strncpy(*result, value, vlen);
796 strncpy(*result + vlen,
797 name + klen, namelen - klen - ksuffixlen);
798 strcpy(*result + vlen + namelen - klen - ksuffixlen,
799 vstar + 1);
e928213f 800 }
a3c84239
DB
801 return ret;
802}
803
c500352e 804static int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
72ff8943
DB
805{
806 int i;
c500352e 807 int find_src = !query->src;
72ff8943 808
c500352e
CMN
809 if (find_src && !query->dst)
810 return error("query_refspecs: need either src or dst");
b42f6927 811
c500352e
CMN
812 for (i = 0; i < ref_count; i++) {
813 struct refspec *refspec = &refs[i];
814 const char *key = find_src ? refspec->dst : refspec->src;
815 const char *value = find_src ? refspec->src : refspec->dst;
816 const char *needle = find_src ? query->dst : query->src;
817 char **result = find_src ? &query->src : &query->dst;
b42f6927 818
c500352e 819 if (!refspec->dst)
5d46c9d4 820 continue;
c500352e 821 if (refspec->pattern) {
e928213f 822 if (match_name_with_pattern(key, needle, value, result)) {
c500352e 823 query->force = refspec->force;
5d46c9d4
DB
824 return 0;
825 }
b42f6927
JS
826 } else if (!strcmp(needle, key)) {
827 *result = xstrdup(value);
c500352e 828 query->force = refspec->force;
b42f6927 829 return 0;
5d46c9d4
DB
830 }
831 }
5d46c9d4
DB
832 return -1;
833}
834
c500352e
CMN
835char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
836 const char *name)
837{
838 struct refspec query;
839
840 memset(&query, 0, sizeof(struct refspec));
841 query.src = (char *)name;
842
843 if (query_refspecs(refspecs, nr_refspec, &query))
844 return NULL;
845
846 return query.dst;
847}
848
849int remote_find_tracking(struct remote *remote, struct refspec *refspec)
850{
851 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
852}
853
8009768e
RS
854static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
855 const char *name)
856{
857 size_t len = strlen(name);
858 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
859 memcpy(ref->name, prefix, prefixlen);
860 memcpy(ref->name + prefixlen, name, len);
861 return ref;
862}
863
59c69c0c 864struct ref *alloc_ref(const char *name)
dfd255dd 865{
59c69c0c 866 return alloc_ref_with_prefix("", 0, name);
737922aa
KK
867}
868
59a57757 869struct ref *copy_ref(const struct ref *ref)
d71ab174 870{
7b3db095
JS
871 struct ref *cpy;
872 size_t len;
873 if (!ref)
874 return NULL;
875 len = strlen(ref->name);
876 cpy = xmalloc(sizeof(struct ref) + len + 1);
877 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
878 cpy->next = NULL;
879 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
880 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
881 cpy->peer_ref = copy_ref(ref->peer_ref);
882 return cpy;
d71ab174
DB
883}
884
4577370e
DB
885struct ref *copy_ref_list(const struct ref *ref)
886{
887 struct ref *ret = NULL;
888 struct ref **tail = &ret;
889 while (ref) {
890 *tail = copy_ref(ref);
891 ref = ref->next;
892 tail = &((*tail)->next);
893 }
894 return ret;
895}
896
697d7f5d 897static void free_ref(struct ref *ref)
be885d96
DB
898{
899 if (!ref)
900 return;
7b3db095 901 free_ref(ref->peer_ref);
be885d96
DB
902 free(ref->remote_status);
903 free(ref->symref);
904 free(ref);
905}
906
dfd255dd
DB
907void free_refs(struct ref *ref)
908{
909 struct ref *next;
910 while (ref) {
911 next = ref->next;
be885d96 912 free_ref(ref);
dfd255dd
DB
913 ref = next;
914 }
915}
916
ed81c76b
JK
917int ref_compare_name(const void *va, const void *vb)
918{
919 const struct ref *a = va, *b = vb;
920 return strcmp(a->name, b->name);
921}
922
923static void *ref_list_get_next(const void *a)
924{
925 return ((const struct ref *)a)->next;
926}
927
928static void ref_list_set_next(void *a, void *next)
929{
930 ((struct ref *)a)->next = next;
931}
932
933void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
934{
935 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
936}
937
6b62816c
DB
938static int count_refspec_match(const char *pattern,
939 struct ref *refs,
940 struct ref **matched_ref)
941{
942 int patlen = strlen(pattern);
943 struct ref *matched_weak = NULL;
944 struct ref *matched = NULL;
945 int weak_match = 0;
946 int match = 0;
947
948 for (weak_match = match = 0; refs; refs = refs->next) {
949 char *name = refs->name;
950 int namelen = strlen(name);
6b62816c 951
ae36bdcf 952 if (!refname_match(pattern, name, ref_rev_parse_rules))
6b62816c
DB
953 continue;
954
955 /* A match is "weak" if it is with refs outside
956 * heads or tags, and did not specify the pattern
957 * in full (e.g. "refs/remotes/origin/master") or at
958 * least from the toplevel (e.g. "remotes/origin/master");
959 * otherwise "git push $URL master" would result in
960 * ambiguity between remotes/origin/master and heads/master
961 * at the remote site.
962 */
963 if (namelen != patlen &&
964 patlen != namelen - 5 &&
965 prefixcmp(name, "refs/heads/") &&
966 prefixcmp(name, "refs/tags/")) {
967 /* We want to catch the case where only weak
968 * matches are found and there are multiple
969 * matches, and where more than one strong
970 * matches are found, as ambiguous. One
971 * strong match with zero or more weak matches
972 * are acceptable as a unique match.
973 */
974 matched_weak = refs;
975 weak_match++;
976 }
977 else {
978 matched = refs;
979 match++;
980 }
981 }
982 if (!matched) {
983 *matched_ref = matched_weak;
984 return weak_match;
985 }
986 else {
987 *matched_ref = matched;
988 return match;
989 }
990}
991
1d735267 992static void tail_link_ref(struct ref *ref, struct ref ***tail)
6b62816c
DB
993{
994 **tail = ref;
1d735267
DB
995 while (ref->next)
996 ref = ref->next;
6b62816c 997 *tail = &ref->next;
6b62816c
DB
998}
999
67655246
FC
1000static struct ref *alloc_delete_ref(void)
1001{
1002 struct ref *ref = alloc_ref("(delete)");
1003 hashclr(ref->new_sha1);
1004 return ref;
1005}
1006
6b62816c
DB
1007static struct ref *try_explicit_object_name(const char *name)
1008{
1009 unsigned char sha1[20];
1010 struct ref *ref;
6b62816c 1011
67655246
FC
1012 if (!*name)
1013 return alloc_delete_ref();
6b62816c
DB
1014 if (get_sha1(name, sha1))
1015 return NULL;
59c69c0c 1016 ref = alloc_ref(name);
6b62816c
DB
1017 hashcpy(ref->new_sha1, sha1);
1018 return ref;
1019}
1020
1d735267 1021static struct ref *make_linked_ref(const char *name, struct ref ***tail)
6b62816c 1022{
59c69c0c 1023 struct ref *ret = alloc_ref(name);
1d735267
DB
1024 tail_link_ref(ret, tail);
1025 return ret;
163f0ee5 1026}
8558fd9e 1027
f8aae120
JK
1028static char *guess_ref(const char *name, struct ref *peer)
1029{
1030 struct strbuf buf = STRBUF_INIT;
1031 unsigned char sha1[20];
1032
8cad4744 1033 const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
f8aae120
JK
1034 if (!r)
1035 return NULL;
1036
1037 if (!prefixcmp(r, "refs/heads/"))
1038 strbuf_addstr(&buf, "refs/heads/");
1039 else if (!prefixcmp(r, "refs/tags/"))
1040 strbuf_addstr(&buf, "refs/tags/");
1041 else
1042 return NULL;
1043
1044 strbuf_addstr(&buf, name);
1045 return strbuf_detach(&buf, NULL);
1046}
1047
54a8ad92
JH
1048static int match_explicit(struct ref *src, struct ref *dst,
1049 struct ref ***dst_tail,
9a7bbd1d 1050 struct refspec *rs)
6b62816c 1051{
54a8ad92 1052 struct ref *matched_src, *matched_dst;
cdf690e5 1053 int copy_src;
8558fd9e 1054
54a8ad92 1055 const char *dst_value = rs->dst;
f8aae120 1056 char *dst_guess;
6b62816c 1057
a83619d6 1058 if (rs->pattern || rs->matching)
9a7bbd1d 1059 return 0;
8558fd9e 1060
54a8ad92
JH
1061 matched_src = matched_dst = NULL;
1062 switch (count_refspec_match(rs->src, src, &matched_src)) {
1063 case 1:
cdf690e5 1064 copy_src = 1;
54a8ad92
JH
1065 break;
1066 case 0:
1067 /* The source could be in the get_sha1() format
1068 * not a reference name. :refs/other is a
1069 * way to delete 'other' ref at the remote end.
1070 */
1071 matched_src = try_explicit_object_name(rs->src);
7dfee372 1072 if (!matched_src)
9a7bbd1d 1073 return error("src refspec %s does not match any.", rs->src);
cdf690e5 1074 copy_src = 0;
54a8ad92
JH
1075 break;
1076 default:
9a7bbd1d 1077 return error("src refspec %s matches more than one.", rs->src);
54a8ad92 1078 }
3c8b7df1 1079
4491e62a 1080 if (!dst_value) {
9f0ea7e8
DB
1081 unsigned char sha1[20];
1082 int flag;
1083
8cad4744 1084 dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
9f0ea7e8
DB
1085 if (!dst_value ||
1086 ((flag & REF_ISSYMREF) &&
1087 prefixcmp(dst_value, "refs/heads/")))
1088 die("%s cannot be resolved to branch.",
1089 matched_src->name);
4491e62a 1090 }
3c8b7df1 1091
54a8ad92
JH
1092 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1093 case 1:
1094 break;
1095 case 0:
163f0ee5 1096 if (!memcmp(dst_value, "refs/", 5))
1d735267 1097 matched_dst = make_linked_ref(dst_value, dst_tail);
5742c82b
JK
1098 else if (is_null_sha1(matched_src->new_sha1))
1099 error("unable to delete '%s': remote ref does not exist",
1100 dst_value);
eeefa7c9 1101 else if ((dst_guess = guess_ref(dst_value, matched_src)))
f8aae120 1102 matched_dst = make_linked_ref(dst_guess, dst_tail);
3c8b7df1 1103 else
f8aae120
JK
1104 error("unable to push to unqualified destination: %s\n"
1105 "The destination refspec neither matches an "
1106 "existing ref on the remote nor\n"
1107 "begins with refs/, and we are unable to "
1108 "guess a prefix based on the source ref.",
1109 dst_value);
54a8ad92
JH
1110 break;
1111 default:
3c8b7df1 1112 matched_dst = NULL;
54a8ad92
JH
1113 error("dst refspec %s matches more than one.",
1114 dst_value);
1115 break;
1116 }
9a7bbd1d
JK
1117 if (!matched_dst)
1118 return -1;
1119 if (matched_dst->peer_ref)
1120 return error("dst ref %s receives from more than one src.",
54a8ad92 1121 matched_dst->name);
54a8ad92 1122 else {
cdf690e5 1123 matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
54a8ad92 1124 matched_dst->force = rs->force;
6b62816c 1125 }
9a7bbd1d 1126 return 0;
54a8ad92
JH
1127}
1128
1129static int match_explicit_refs(struct ref *src, struct ref *dst,
1130 struct ref ***dst_tail, struct refspec *rs,
1131 int rs_nr)
1132{
1133 int i, errs;
1134 for (i = errs = 0; i < rs_nr; i++)
9a7bbd1d
JK
1135 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1136 return errs;
6b62816c
DB
1137}
1138
db70a04c 1139static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
6ddba5e2 1140 int send_mirror, int direction, const struct refspec **ret_pat)
8558fd9e 1141{
db70a04c
FC
1142 const struct refspec *pat;
1143 char *name;
8558fd9e 1144 int i;
a83619d6 1145 int matching_refs = -1;
8558fd9e 1146 for (i = 0; i < rs_nr; i++) {
a83619d6
PB
1147 if (rs[i].matching &&
1148 (matching_refs == -1 || rs[i].force)) {
1149 matching_refs = i;
1150 continue;
1151 }
1152
db70a04c
FC
1153 if (rs[i].pattern) {
1154 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
6ddba5e2
FC
1155 int match;
1156 if (direction == FROM_SRC)
1157 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1158 else
1159 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1160 if (match) {
db70a04c
FC
1161 matching_refs = i;
1162 break;
1163 }
1164 }
8558fd9e 1165 }
db70a04c 1166 if (matching_refs == -1)
a83619d6 1167 return NULL;
db70a04c
FC
1168
1169 pat = rs + matching_refs;
1170 if (pat->matching) {
1171 /*
1172 * "matching refs"; traditionally we pushed everything
1173 * including refs outside refs/heads/ hierarchy, but
1174 * that does not make much sense these days.
1175 */
1176 if (!send_mirror && prefixcmp(ref->name, "refs/heads/"))
1177 return NULL;
1178 name = xstrdup(ref->name);
1179 }
1180 if (ret_pat)
1181 *ret_pat = pat;
1182 return name;
8558fd9e
DB
1183}
1184
6d2bf96e
CB
1185static struct ref **tail_ref(struct ref **head)
1186{
1187 struct ref **tail = head;
1188 while (*tail)
1189 tail = &((*tail)->next);
1190 return tail;
1191}
1192
54a8ad92 1193/*
29753cdd
JH
1194 * Given the set of refs the local repository has, the set of refs the
1195 * remote repository has, and the refspec used for push, determine
1196 * what remote refs we will update and with what value by setting
1197 * peer_ref (which object is being pushed) and force (if the push is
1198 * forced) in elements of "dst". The function may add new elements to
1199 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
54a8ad92 1200 */
29753cdd
JH
1201int match_push_refs(struct ref *src, struct ref **dst,
1202 int nr_refspec, const char **refspec, int flags)
6b62816c 1203{
a83619d6 1204 struct refspec *rs;
28b9d6e5
AW
1205 int send_all = flags & MATCH_REFS_ALL;
1206 int send_mirror = flags & MATCH_REFS_MIRROR;
6ddba5e2 1207 int send_prune = flags & MATCH_REFS_PRUNE;
5f48cb95 1208 int errs;
2af202be 1209 static const char *default_refspec[] = { ":", NULL };
b1d8b1f3 1210 struct ref *ref, **dst_tail = tail_ref(dst);
6b62816c 1211
a83619d6
PB
1212 if (!nr_refspec) {
1213 nr_refspec = 1;
1214 refspec = default_refspec;
1215 }
1216 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
6d2bf96e 1217 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
6b62816c
DB
1218
1219 /* pick the remainder */
b1d8b1f3 1220 for (ref = src; ref; ref = ref->next) {
6b62816c 1221 struct ref *dst_peer;
6e66bf3c
AR
1222 const struct refspec *pat = NULL;
1223 char *dst_name;
db70a04c 1224
b1d8b1f3 1225 if (ref->peer_ref)
6b62816c 1226 continue;
a83619d6 1227
6ddba5e2 1228 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
db70a04c 1229 if (!dst_name)
a83619d6
PB
1230 continue;
1231
6d2bf96e 1232 dst_peer = find_ref_by_name(*dst, dst_name);
a83619d6
PB
1233 if (dst_peer) {
1234 if (dst_peer->peer_ref)
1235 /* We're already sending something to this ref. */
1236 goto free_name;
a83619d6
PB
1237 } else {
1238 if (pat->matching && !(send_all || send_mirror))
1239 /*
1240 * Remote doesn't have it, and we have no
1241 * explicit pattern, and we don't have
1242 * --all nor --mirror.
1243 */
1244 goto free_name;
28b9d6e5 1245
6b62816c 1246 /* Create a new one and link it */
6d2bf96e 1247 dst_peer = make_linked_ref(dst_name, &dst_tail);
b1d8b1f3 1248 hashcpy(dst_peer->new_sha1, ref->new_sha1);
6b62816c 1249 }
b1d8b1f3 1250 dst_peer->peer_ref = copy_ref(ref);
a83619d6 1251 dst_peer->force = pat->force;
6e66bf3c
AR
1252 free_name:
1253 free(dst_name);
6b62816c 1254 }
6ddba5e2
FC
1255 if (send_prune) {
1256 /* check for missing refs on the remote */
1257 for (ref = *dst; ref; ref = ref->next) {
1258 char *src_name;
1259
1260 if (ref->peer_ref)
1261 /* We're already sending something to this ref. */
1262 continue;
1263
1264 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1265 if (src_name) {
1266 if (!find_ref_by_name(src, src_name))
1267 ref->peer_ref = alloc_delete_ref();
1268 free(src_name);
1269 }
1270 }
1271 }
5f48cb95
JS
1272 if (errs)
1273 return -1;
6b62816c
DB
1274 return 0;
1275}
cf818348 1276
b24e6047
CR
1277static inline int is_forwardable(struct ref* ref)
1278{
40eff179
CR
1279 struct object *o;
1280
b24e6047
CR
1281 if (!prefixcmp(ref->name, "refs/tags/"))
1282 return 0;
1283
40eff179
CR
1284 /* old object must be a commit */
1285 o = parse_object(ref->old_sha1);
1286 if (!o || o->type != OBJ_COMMIT)
1287 return 0;
1288
80054cf9
CR
1289 /* new object must be commit-ish */
1290 o = deref_tag(parse_object(ref->new_sha1), NULL, 0);
1291 if (!o || o->type != OBJ_COMMIT)
1292 return 0;
1293
b24e6047
CR
1294 return 1;
1295}
1296
20e8b465
TRC
1297void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1298 int force_update)
1299{
1300 struct ref *ref;
1301
1302 for (ref = remote_refs; ref; ref = ref->next) {
8c5f6f71
CR
1303 int force_ref_update = ref->force || force_update;
1304
20e8b465
TRC
1305 if (ref->peer_ref)
1306 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1307 else if (!send_mirror)
1308 continue;
1309
1310 ref->deletion = is_null_sha1(ref->new_sha1);
1311 if (!ref->deletion &&
1312 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1313 ref->status = REF_STATUS_UPTODATE;
1314 continue;
1315 }
1316
a272b289
CR
1317 /*
1318 * The below logic determines whether an individual
1319 * refspec A:B can be pushed. The push will succeed
1320 * if any of the following are true:
20e8b465 1321 *
a272b289 1322 * (1) the remote reference B does not exist
20e8b465 1323 *
a272b289
CR
1324 * (2) the remote reference B is being removed (i.e.,
1325 * pushing :B where no source is specified)
20e8b465 1326 *
a272b289 1327 * (3) the update meets all fast-forwarding criteria:
20e8b465 1328 *
a272b289
CR
1329 * (a) the destination is not under refs/tags/
1330 * (b) the old is a commit
1331 * (c) the new is a descendant of the old
20e8b465 1332 *
a272b289
CR
1333 * NOTE: We must actually have the old object in
1334 * order to overwrite it in the remote reference,
1335 * and the new object must be commit-ish. These are
1336 * implied by (b) and (c) respectively.
20e8b465 1337 *
a272b289
CR
1338 * (4) it is forced using the +A:B notation, or by
1339 * passing the --force argument
20e8b465
TRC
1340 */
1341
b24e6047 1342 ref->not_forwardable = !is_forwardable(ref);
20e8b465 1343
ffe81ef2 1344 ref->update =
20e8b465 1345 !ref->deletion &&
ffe81ef2 1346 !is_null_sha1(ref->old_sha1);
20e8b465 1347
ffe81ef2
CR
1348 if (ref->update) {
1349 ref->nonfastforward =
1350 !has_sha1_file(ref->old_sha1)
1351 || !ref_newer(ref->new_sha1, ref->old_sha1);
1352
dbfeddb1
CR
1353 if (ref->not_forwardable) {
1354 ref->requires_force = 1;
1355 if (!force_ref_update) {
1356 ref->status = REF_STATUS_REJECT_ALREADY_EXISTS;
1357 continue;
1358 }
1359 } else if (ref->nonfastforward) {
8c5f6f71
CR
1360 ref->requires_force = 1;
1361 if (!force_ref_update) {
1362 ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
1363 continue;
1364 }
ffe81ef2 1365 }
20e8b465
TRC
1366 }
1367 }
1368}
1369
cf818348
DB
1370struct branch *branch_get(const char *name)
1371{
1372 struct branch *ret;
1373
1374 read_config();
1375 if (!name || !*name || !strcmp(name, "HEAD"))
1376 ret = current_branch;
1377 else
1378 ret = make_branch(name, 0);
1379 if (ret && ret->remote_name) {
1380 ret->remote = remote_get(ret->remote_name);
1381 if (ret->merge_nr) {
1382 int i;
1383 ret->merge = xcalloc(sizeof(*ret->merge),
1384 ret->merge_nr);
1385 for (i = 0; i < ret->merge_nr; i++) {
1386 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1387 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
5e6e2b48
MG
1388 if (remote_find_tracking(ret->remote, ret->merge[i])
1389 && !strcmp(ret->remote_name, "."))
1390 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
cf818348
DB
1391 }
1392 }
1393 }
1394 return ret;
1395}
1396
1397int branch_has_merge_config(struct branch *branch)
1398{
1399 return branch && !!branch->merge;
1400}
1401
85682c19
SP
1402int branch_merge_matches(struct branch *branch,
1403 int i,
1404 const char *refname)
cf818348 1405{
85682c19 1406 if (!branch || i < 0 || i >= branch->merge_nr)
cf818348 1407 return 0;
605b4978 1408 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
cf818348 1409}
d71ab174 1410
f8fb971e
JH
1411static int ignore_symref_update(const char *refname)
1412{
1413 unsigned char sha1[20];
1414 int flag;
1415
1416 if (!resolve_ref_unsafe(refname, sha1, 0, &flag))
1417 return 0; /* non-existing refs are OK */
1418 return (flag & REF_ISSYMREF);
1419}
1420
4577370e 1421static struct ref *get_expanded_map(const struct ref *remote_refs,
d71ab174
DB
1422 const struct refspec *refspec)
1423{
4577370e 1424 const struct ref *ref;
d71ab174
DB
1425 struct ref *ret = NULL;
1426 struct ref **tail = &ret;
1427
e928213f 1428 char *expn_name;
d71ab174
DB
1429
1430 for (ref = remote_refs; ref; ref = ref->next) {
1431 if (strchr(ref->name, '^'))
1432 continue; /* a dereference item */
e928213f 1433 if (match_name_with_pattern(refspec->src, ref->name,
f8fb971e
JH
1434 refspec->dst, &expn_name) &&
1435 !ignore_symref_update(expn_name)) {
d71ab174 1436 struct ref *cpy = copy_ref(ref);
d71ab174 1437
e928213f
DB
1438 cpy->peer_ref = alloc_ref(expn_name);
1439 free(expn_name);
d71ab174
DB
1440 if (refspec->force)
1441 cpy->peer_ref->force = 1;
1442 *tail = cpy;
1443 tail = &cpy->next;
1444 }
1445 }
1446
1447 return ret;
1448}
1449
4577370e 1450static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
d71ab174 1451{
4577370e 1452 const struct ref *ref;
d71ab174 1453 for (ref = refs; ref; ref = ref->next) {
605b4978 1454 if (refname_match(name, ref->name, ref_fetch_rules))
d71ab174
DB
1455 return ref;
1456 }
1457 return NULL;
1458}
1459
4577370e 1460struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
d71ab174 1461{
4577370e 1462 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
d71ab174
DB
1463
1464 if (!ref)
9ad7c5ae 1465 return NULL;
d71ab174
DB
1466
1467 return copy_ref(ref);
1468}
1469
1470static struct ref *get_local_ref(const char *name)
1471{
3eb96997 1472 if (!name || name[0] == '\0')
d71ab174
DB
1473 return NULL;
1474
59c69c0c
RS
1475 if (!prefixcmp(name, "refs/"))
1476 return alloc_ref(name);
d71ab174
DB
1477
1478 if (!prefixcmp(name, "heads/") ||
1479 !prefixcmp(name, "tags/") ||
8009768e
RS
1480 !prefixcmp(name, "remotes/"))
1481 return alloc_ref_with_prefix("refs/", 5, name);
d71ab174 1482
8009768e 1483 return alloc_ref_with_prefix("refs/heads/", 11, name);
d71ab174
DB
1484}
1485
4577370e 1486int get_fetch_map(const struct ref *remote_refs,
d71ab174 1487 const struct refspec *refspec,
9ad7c5ae
JH
1488 struct ref ***tail,
1489 int missing_ok)
d71ab174 1490{
ef00d150 1491 struct ref *ref_map, **rmp;
d71ab174
DB
1492
1493 if (refspec->pattern) {
1494 ref_map = get_expanded_map(remote_refs, refspec);
1495 } else {
9ad7c5ae
JH
1496 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1497
1498 ref_map = get_remote_ref(remote_refs, name);
1499 if (!missing_ok && !ref_map)
1500 die("Couldn't find remote ref %s", name);
1501 if (ref_map) {
1502 ref_map->peer_ref = get_local_ref(refspec->dst);
1503 if (ref_map->peer_ref && refspec->force)
1504 ref_map->peer_ref->force = 1;
1505 }
d71ab174
DB
1506 }
1507
ef00d150
DB
1508 for (rmp = &ref_map; *rmp; ) {
1509 if ((*rmp)->peer_ref) {
5c08c1f2
JH
1510 if (prefixcmp((*rmp)->peer_ref->name, "refs/") ||
1511 check_refname_format((*rmp)->peer_ref->name, 0)) {
ef00d150
DB
1512 struct ref *ignore = *rmp;
1513 error("* Ignoring funny ref '%s' locally",
1514 (*rmp)->peer_ref->name);
1515 *rmp = (*rmp)->next;
1516 free(ignore->peer_ref);
1517 free(ignore);
1518 continue;
1519 }
1520 }
1521 rmp = &((*rmp)->next);
d71ab174
DB
1522 }
1523
8f70a765
AR
1524 if (ref_map)
1525 tail_link_ref(ref_map, tail);
d71ab174
DB
1526
1527 return 0;
1528}
be885d96
DB
1529
1530int resolve_remote_symref(struct ref *ref, struct ref *list)
1531{
1532 if (!ref->symref)
1533 return 0;
1534 for (; list; list = list->next)
1535 if (!strcmp(ref->symref, list->name)) {
1536 hashcpy(ref->old_sha1, list->old_sha1);
1537 return 0;
1538 }
1539 return 1;
1540}
6d21bf96 1541
ec8452d5
JS
1542static void unmark_and_free(struct commit_list *list, unsigned int mark)
1543{
1544 while (list) {
1545 struct commit_list *temp = list;
1546 temp->item->object.flags &= ~mark;
1547 list = temp->next;
1548 free(temp);
1549 }
1550}
1551
1552int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1553{
1554 struct object *o;
1555 struct commit *old, *new;
1556 struct commit_list *list, *used;
1557 int found = 0;
1558
1559 /* Both new and old must be commit-ish and new is descendant of
1560 * old. Otherwise we require --force.
1561 */
1562 o = deref_tag(parse_object(old_sha1), NULL, 0);
1563 if (!o || o->type != OBJ_COMMIT)
1564 return 0;
1565 old = (struct commit *) o;
1566
1567 o = deref_tag(parse_object(new_sha1), NULL, 0);
1568 if (!o || o->type != OBJ_COMMIT)
1569 return 0;
1570 new = (struct commit *) o;
1571
1572 if (parse_commit(new) < 0)
1573 return 0;
1574
1575 used = list = NULL;
1576 commit_list_insert(new, &list);
1577 while (list) {
1578 new = pop_most_recent_commit(&list, TMP_MARK);
1579 commit_list_insert(new, &used);
1580 if (new == old) {
1581 found = 1;
1582 break;
1583 }
1584 }
1585 unmark_and_free(list, TMP_MARK);
1586 unmark_and_free(used, TMP_MARK);
1587 return found;
1588}
1589
6d21bf96
JH
1590/*
1591 * Return true if there is anything to report, otherwise false.
1592 */
1593int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1594{
1595 unsigned char sha1[20];
1596 struct commit *ours, *theirs;
1597 char symmetric[84];
1598 struct rev_info revs;
1599 const char *rev_argv[10], *base;
1600 int rev_argc;
1601
1602 /*
1603 * Nothing to report unless we are marked to build on top of
1604 * somebody else.
1605 */
1606 if (!branch ||
1607 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1608 return 0;
1609
1610 /*
1611 * If what we used to build on no longer exists, there is
1612 * nothing to report.
1613 */
1614 base = branch->merge[0]->dst;
c6893323 1615 if (read_ref(base, sha1))
6d21bf96 1616 return 0;
57ffc5f8 1617 theirs = lookup_commit_reference(sha1);
6d21bf96
JH
1618 if (!theirs)
1619 return 0;
1620
c6893323 1621 if (read_ref(branch->refname, sha1))
6d21bf96 1622 return 0;
57ffc5f8 1623 ours = lookup_commit_reference(sha1);
6d21bf96
JH
1624 if (!ours)
1625 return 0;
1626
1627 /* are we the same? */
1628 if (theirs == ours)
1629 return 0;
1630
8fbf879e 1631 /* Run "rev-list --left-right ours...theirs" internally... */
6d21bf96
JH
1632 rev_argc = 0;
1633 rev_argv[rev_argc++] = NULL;
1634 rev_argv[rev_argc++] = "--left-right";
1635 rev_argv[rev_argc++] = symmetric;
1636 rev_argv[rev_argc++] = "--";
1637 rev_argv[rev_argc] = NULL;
1638
1639 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1640 strcpy(symmetric + 40, "...");
1641 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1642
1643 init_revisions(&revs, NULL);
1644 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1645 prepare_revision_walk(&revs);
1646
1647 /* ... and count the commits on each side. */
1648 *num_ours = 0;
1649 *num_theirs = 0;
1650 while (1) {
1651 struct commit *c = get_revision(&revs);
1652 if (!c)
1653 break;
1654 if (c->object.flags & SYMMETRIC_LEFT)
1655 (*num_ours)++;
1656 else
1657 (*num_theirs)++;
1658 }
c0234b2e
JH
1659
1660 /* clear object flags smudged by the above traversal */
1661 clear_commit_marks(ours, ALL_REV_FLAGS);
1662 clear_commit_marks(theirs, ALL_REV_FLAGS);
6d21bf96
JH
1663 return 1;
1664}
1665
1666/*
1667 * Return true when there is anything to report, otherwise false.
1668 */
1669int format_tracking_info(struct branch *branch, struct strbuf *sb)
1670{
1671 int num_ours, num_theirs;
4de53ce0 1672 const char *base;
6d21bf96
JH
1673
1674 if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1675 return 0;
1676
1677 base = branch->merge[0]->dst;
45972ffb 1678 base = shorten_unambiguous_ref(base, 0);
c190ced6 1679 if (!num_theirs) {
8a5b7494
JX
1680 strbuf_addf(sb,
1681 Q_("Your branch is ahead of '%s' by %d commit.\n",
1682 "Your branch is ahead of '%s' by %d commits.\n",
1683 num_ours),
1684 base, num_ours);
491e3075
JK
1685 if (advice_status_hints)
1686 strbuf_addf(sb,
1687 _(" (use \"git push\" to publish your local commits)\n"));
c190ced6 1688 } else if (!num_ours) {
8a5b7494
JX
1689 strbuf_addf(sb,
1690 Q_("Your branch is behind '%s' by %d commit, "
1691 "and can be fast-forwarded.\n",
1692 "Your branch is behind '%s' by %d commits, "
1693 "and can be fast-forwarded.\n",
1694 num_theirs),
1695 base, num_theirs);
491e3075
JK
1696 if (advice_status_hints)
1697 strbuf_addf(sb,
1698 _(" (use \"git pull\" to update your local branch)\n"));
c190ced6 1699 } else {
8a5b7494
JX
1700 strbuf_addf(sb,
1701 Q_("Your branch and '%s' have diverged,\n"
1702 "and have %d and %d different commit each, "
1703 "respectively.\n",
1704 "Your branch and '%s' have diverged,\n"
1705 "and have %d and %d different commits each, "
1706 "respectively.\n",
1707 num_theirs),
1708 base, num_ours, num_theirs);
491e3075
JK
1709 if (advice_status_hints)
1710 strbuf_addf(sb,
1711 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
c190ced6 1712 }
6d21bf96
JH
1713 return 1;
1714}
454e2025
JS
1715
1716static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1717{
1718 struct ref ***local_tail = cb_data;
1719 struct ref *ref;
1720 int len;
1721
1722 /* we already know it starts with refs/ to get here */
8d9c5010 1723 if (check_refname_format(refname + 5, 0))
454e2025
JS
1724 return 0;
1725
1726 len = strlen(refname) + 1;
1727 ref = xcalloc(1, sizeof(*ref) + len);
1728 hashcpy(ref->new_sha1, sha1);
1729 memcpy(ref->name, refname, len);
1730 **local_tail = ref;
1731 *local_tail = &ref->next;
1732 return 0;
1733}
1734
1735struct ref *get_local_heads(void)
1736{
55f0566f 1737 struct ref *local_refs = NULL, **local_tail = &local_refs;
454e2025
JS
1738 for_each_ref(one_local_ref, &local_tail);
1739 return local_refs;
1740}
8ef51733 1741
4229f1fa
JS
1742struct ref *guess_remote_head(const struct ref *head,
1743 const struct ref *refs,
1744 int all)
8ef51733 1745{
8ef51733 1746 const struct ref *r;
4229f1fa
JS
1747 struct ref *list = NULL;
1748 struct ref **tail = &list;
8ef51733 1749
6cb4e6cc 1750 if (!head)
8ef51733
JS
1751 return NULL;
1752
fbb074c2
JK
1753 /*
1754 * Some transports support directly peeking at
1755 * where HEAD points; if that is the case, then
1756 * we don't have to guess.
1757 */
1758 if (head->symref)
1759 return copy_ref(find_ref_by_name(refs, head->symref));
1760
8ef51733 1761 /* If refs/heads/master could be right, it is. */
4229f1fa
JS
1762 if (!all) {
1763 r = find_ref_by_name(refs, "refs/heads/master");
1764 if (r && !hashcmp(r->old_sha1, head->old_sha1))
1765 return copy_ref(r);
1766 }
8ef51733
JS
1767
1768 /* Look for another ref that points there */
4229f1fa 1769 for (r = refs; r; r = r->next) {
61adfd30
JK
1770 if (r != head &&
1771 !prefixcmp(r->name, "refs/heads/") &&
1772 !hashcmp(r->old_sha1, head->old_sha1)) {
4229f1fa
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1773 *tail = copy_ref(r);
1774 tail = &((*tail)->next);
1775 if (!all)
1776 break;
1777 }
1778 }
8ef51733 1779
4229f1fa 1780 return list;
8ef51733 1781}
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1782
1783struct stale_heads_info {
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1784 struct string_list *ref_names;
1785 struct ref **stale_refs_tail;
ed43de6e
CMN
1786 struct refspec *refs;
1787 int ref_count;
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1788};
1789
1790static int get_stale_heads_cb(const char *refname,
1791 const unsigned char *sha1, int flags, void *cb_data)
1792{
1793 struct stale_heads_info *info = cb_data;
ed43de6e
CMN
1794 struct refspec query;
1795 memset(&query, 0, sizeof(struct refspec));
1796 query.dst = (char *)refname;
1797
1798 if (query_refspecs(info->refs, info->ref_count, &query))
1799 return 0; /* No matches */
1800
1801 /*
1802 * If we did find a suitable refspec and it's not a symref and
1803 * it's not in the list of refs that currently exist in that
1804 * remote we consider it to be stale.
1805 */
1806 if (!((flags & REF_ISSYMREF) ||
1807 string_list_has_string(info->ref_names, query.src))) {
1808 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
1809 hashcpy(ref->new_sha1, sha1);
f2ef6075 1810 }
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CMN
1811
1812 free(query.src);
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1813 return 0;
1814}
1815
ed43de6e 1816struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
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1817{
1818 struct ref *ref, *stale_refs = NULL;
183113a5 1819 struct string_list ref_names = STRING_LIST_INIT_NODUP;
f2ef6075 1820 struct stale_heads_info info;
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JS
1821 info.ref_names = &ref_names;
1822 info.stale_refs_tail = &stale_refs;
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CMN
1823 info.refs = refs;
1824 info.ref_count = ref_count;
f2ef6075 1825 for (ref = fetch_map; ref; ref = ref->next)
1d2f80fa 1826 string_list_append(&ref_names, ref->name);
f2ef6075
JS
1827 sort_string_list(&ref_names);
1828 for_each_ref(get_stale_heads_cb, &info);
1829 string_list_clear(&ref_names, 0);
1830 return stale_refs;
1831}