Change check_ref_format() to take a flags argument
[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"
5751f490 10
e0aaa29f
DB
11static struct refspec s_tag_refspec = {
12 0,
13 1,
b84c343c 14 0,
08fbdb30
DB
15 "refs/tags/*",
16 "refs/tags/*"
e0aaa29f
DB
17};
18
19const struct refspec *tag_refspec = &s_tag_refspec;
20
844112ca
JH
21struct counted_string {
22 size_t len;
23 const char *s;
24};
55029ae4
DB
25struct rewrite {
26 const char *base;
844112ca
JH
27 size_t baselen;
28 struct counted_string *instead_of;
55029ae4
DB
29 int instead_of_nr;
30 int instead_of_alloc;
31};
d071d942
JT
32struct rewrites {
33 struct rewrite **rewrite;
34 int rewrite_alloc;
35 int rewrite_nr;
36};
55029ae4 37
5751f490 38static struct remote **remotes;
2d31347b
DB
39static int remotes_alloc;
40static int remotes_nr;
5751f490 41
cf818348 42static struct branch **branches;
2d31347b
DB
43static int branches_alloc;
44static int branches_nr;
cf818348
DB
45
46static struct branch *current_branch;
47static const char *default_remote_name;
fa685bdf 48static int explicit_default_remote_name;
cf818348 49
d071d942 50static struct rewrites rewrites;
1c2eafb8 51static struct rewrites rewrites_push;
55029ae4 52
5751f490
DB
53#define BUF_SIZE (2048)
54static char buffer[BUF_SIZE];
55
0a4da29d
DB
56static int valid_remote(const struct remote *remote)
57{
c578f51d 58 return (!!remote->url) || (!!remote->foreign_vcs);
0a4da29d
DB
59}
60
d071d942 61static const char *alias_url(const char *url, struct rewrites *r)
55029ae4
DB
62{
63 int i, j;
844112ca
JH
64 char *ret;
65 struct counted_string *longest;
66 int longest_i;
67
68 longest = NULL;
69 longest_i = -1;
d071d942
JT
70 for (i = 0; i < r->rewrite_nr; i++) {
71 if (!r->rewrite[i])
55029ae4 72 continue;
d071d942
JT
73 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
74 if (!prefixcmp(url, r->rewrite[i]->instead_of[j].s) &&
844112ca 75 (!longest ||
d071d942
JT
76 longest->len < r->rewrite[i]->instead_of[j].len)) {
77 longest = &(r->rewrite[i]->instead_of[j]);
844112ca 78 longest_i = i;
55029ae4
DB
79 }
80 }
81 }
844112ca
JH
82 if (!longest)
83 return url;
84
d071d942 85 ret = xmalloc(r->rewrite[longest_i]->baselen +
844112ca 86 (strlen(url) - longest->len) + 1);
d071d942
JT
87 strcpy(ret, r->rewrite[longest_i]->base);
88 strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
844112ca 89 return ret;
55029ae4
DB
90}
91
5751f490
DB
92static void add_push_refspec(struct remote *remote, const char *ref)
93{
2d31347b
DB
94 ALLOC_GROW(remote->push_refspec,
95 remote->push_refspec_nr + 1,
96 remote->push_refspec_alloc);
97 remote->push_refspec[remote->push_refspec_nr++] = ref;
5751f490
DB
98}
99
5d46c9d4
DB
100static void add_fetch_refspec(struct remote *remote, const char *ref)
101{
2d31347b
DB
102 ALLOC_GROW(remote->fetch_refspec,
103 remote->fetch_refspec_nr + 1,
104 remote->fetch_refspec_alloc);
105 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
5d46c9d4
DB
106}
107
28b91f8a 108static void add_url(struct remote *remote, const char *url)
5751f490 109{
2d31347b
DB
110 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
111 remote->url[remote->url_nr++] = url;
5751f490
DB
112}
113
20346234
MG
114static void add_pushurl(struct remote *remote, const char *pushurl)
115{
116 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
117 remote->pushurl[remote->pushurl_nr++] = pushurl;
118}
119
1c2eafb8
JT
120static void add_pushurl_alias(struct remote *remote, const char *url)
121{
122 const char *pushurl = alias_url(url, &rewrites_push);
123 if (pushurl != url)
124 add_pushurl(remote, pushurl);
125}
126
127static void add_url_alias(struct remote *remote, const char *url)
128{
129 add_url(remote, alias_url(url, &rewrites));
130 add_pushurl_alias(remote, url);
131}
132
5751f490
DB
133static struct remote *make_remote(const char *name, int len)
134{
2d31347b
DB
135 struct remote *ret;
136 int i;
5751f490 137
2d31347b
DB
138 for (i = 0; i < remotes_nr; i++) {
139 if (len ? (!strncmp(name, remotes[i]->name, len) &&
140 !remotes[i]->name[len]) :
141 !strcmp(name, remotes[i]->name))
142 return remotes[i];
5751f490
DB
143 }
144
2d31347b
DB
145 ret = xcalloc(1, sizeof(struct remote));
146 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
147 remotes[remotes_nr++] = ret;
5751f490 148 if (len)
2d31347b 149 ret->name = xstrndup(name, len);
5751f490 150 else
2d31347b
DB
151 ret->name = xstrdup(name);
152 return ret;
5751f490
DB
153}
154
cf818348
DB
155static void add_merge(struct branch *branch, const char *name)
156{
2d31347b
DB
157 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
158 branch->merge_alloc);
159 branch->merge_name[branch->merge_nr++] = name;
cf818348
DB
160}
161
162static struct branch *make_branch(const char *name, int len)
163{
2d31347b
DB
164 struct branch *ret;
165 int i;
cf818348
DB
166 char *refname;
167
2d31347b
DB
168 for (i = 0; i < branches_nr; i++) {
169 if (len ? (!strncmp(name, branches[i]->name, len) &&
170 !branches[i]->name[len]) :
171 !strcmp(name, branches[i]->name))
172 return branches[i];
cf818348
DB
173 }
174
2d31347b
DB
175 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
176 ret = xcalloc(1, sizeof(struct branch));
177 branches[branches_nr++] = ret;
cf818348 178 if (len)
2d31347b 179 ret->name = xstrndup(name, len);
cf818348 180 else
2d31347b 181 ret->name = xstrdup(name);
e8eec71d 182 refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
cf818348 183 strcpy(refname, "refs/heads/");
2d31347b
DB
184 strcpy(refname + strlen("refs/heads/"), ret->name);
185 ret->refname = refname;
cf818348 186
2d31347b 187 return ret;
cf818348
DB
188}
189
d071d942 190static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
55029ae4
DB
191{
192 struct rewrite *ret;
193 int i;
194
d071d942 195 for (i = 0; i < r->rewrite_nr; i++) {
844112ca 196 if (len
d071d942
JT
197 ? (len == r->rewrite[i]->baselen &&
198 !strncmp(base, r->rewrite[i]->base, len))
199 : !strcmp(base, r->rewrite[i]->base))
200 return r->rewrite[i];
55029ae4
DB
201 }
202
d071d942 203 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
55029ae4 204 ret = xcalloc(1, sizeof(struct rewrite));
d071d942 205 r->rewrite[r->rewrite_nr++] = ret;
844112ca 206 if (len) {
55029ae4 207 ret->base = xstrndup(base, len);
844112ca
JH
208 ret->baselen = len;
209 }
210 else {
55029ae4 211 ret->base = xstrdup(base);
844112ca
JH
212 ret->baselen = strlen(base);
213 }
55029ae4
DB
214 return ret;
215}
216
217static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
218{
219 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
844112ca
JH
220 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
221 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
222 rewrite->instead_of_nr++;
55029ae4
DB
223}
224
5751f490
DB
225static void read_remotes_file(struct remote *remote)
226{
227 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
228
229 if (!f)
230 return;
89cf4c70 231 remote->origin = REMOTE_REMOTES;
5751f490
DB
232 while (fgets(buffer, BUF_SIZE, f)) {
233 int value_list;
234 char *s, *p;
235
236 if (!prefixcmp(buffer, "URL:")) {
237 value_list = 0;
238 s = buffer + 4;
239 } else if (!prefixcmp(buffer, "Push:")) {
240 value_list = 1;
241 s = buffer + 5;
5d46c9d4
DB
242 } else if (!prefixcmp(buffer, "Pull:")) {
243 value_list = 2;
244 s = buffer + 5;
5751f490
DB
245 } else
246 continue;
247
248 while (isspace(*s))
249 s++;
250 if (!*s)
251 continue;
252
253 p = s + strlen(s);
254 while (isspace(p[-1]))
255 *--p = 0;
256
257 switch (value_list) {
258 case 0:
55029ae4 259 add_url_alias(remote, xstrdup(s));
5751f490
DB
260 break;
261 case 1:
262 add_push_refspec(remote, xstrdup(s));
263 break;
5d46c9d4
DB
264 case 2:
265 add_fetch_refspec(remote, xstrdup(s));
266 break;
5751f490
DB
267 }
268 }
269 fclose(f);
270}
271
272static void read_branches_file(struct remote *remote)
273{
274 const char *slash = strchr(remote->name, '/');
cf818348 275 char *frag;
f285a2d7 276 struct strbuf branch = STRBUF_INIT;
5751f490
DB
277 int n = slash ? slash - remote->name : 1000;
278 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
279 char *s, *p;
280 int len;
281
282 if (!f)
283 return;
284 s = fgets(buffer, BUF_SIZE, f);
285 fclose(f);
286 if (!s)
287 return;
288 while (isspace(*s))
289 s++;
290 if (!*s)
291 return;
89cf4c70 292 remote->origin = REMOTE_BRANCHES;
5751f490
DB
293 p = s + strlen(s);
294 while (isspace(p[-1]))
295 *--p = 0;
296 len = p - s;
297 if (slash)
298 len += strlen(slash);
299 p = xmalloc(len + 1);
300 strcpy(p, s);
301 if (slash)
302 strcat(p, slash);
472fa4cd
DB
303
304 /*
305 * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
306 * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
307 * the partial URL obtained from the branches file plus
308 * "/netdev-2.6" and does not store it in any tracking ref.
309 * #branch specifier in the file is ignored.
310 *
311 * Otherwise, the branches file would have URL and optionally
312 * #branch specified. The "master" (or specified) branch is
313 * fetched and stored in the local branch of the same name.
314 */
cf818348
DB
315 frag = strchr(p, '#');
316 if (frag) {
317 *(frag++) = '\0';
472fa4cd
DB
318 strbuf_addf(&branch, "refs/heads/%s", frag);
319 } else
320 strbuf_addstr(&branch, "refs/heads/master");
321 if (!slash) {
322 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
cf818348 323 } else {
472fa4cd
DB
324 strbuf_reset(&branch);
325 strbuf_addstr(&branch, "HEAD:");
cf818348 326 }
55029ae4 327 add_url_alias(remote, p);
2af202be 328 add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
18afe101
MK
329 /*
330 * Cogito compatible push: push current HEAD to remote #branch
331 * (master if missing)
332 */
333 strbuf_init(&branch, 0);
334 strbuf_addstr(&branch, "HEAD");
335 if (frag)
336 strbuf_addf(&branch, ":refs/heads/%s", frag);
337 else
338 strbuf_addstr(&branch, ":refs/heads/master");
2af202be 339 add_push_refspec(remote, strbuf_detach(&branch, NULL));
d71ab174 340 remote->fetch_tags = 1; /* always auto-follow */
5751f490
DB
341}
342
ef90d6d4 343static int handle_config(const char *key, const char *value, void *cb)
5751f490
DB
344{
345 const char *name;
346 const char *subkey;
347 struct remote *remote;
cf818348
DB
348 struct branch *branch;
349 if (!prefixcmp(key, "branch.")) {
350 name = key + 7;
351 subkey = strrchr(name, '.');
cf818348
DB
352 if (!subkey)
353 return 0;
896c0535 354 branch = make_branch(name, subkey - name);
cf818348 355 if (!strcmp(subkey, ".remote")) {
d2370cc2
JH
356 if (!value)
357 return config_error_nonbool(key);
cf818348 358 branch->remote_name = xstrdup(value);
fa685bdf 359 if (branch == current_branch) {
cf818348 360 default_remote_name = branch->remote_name;
fa685bdf
DB
361 explicit_default_remote_name = 1;
362 }
d2370cc2
JH
363 } else if (!strcmp(subkey, ".merge")) {
364 if (!value)
365 return config_error_nonbool(key);
cf818348 366 add_merge(branch, xstrdup(value));
d2370cc2 367 }
cf818348 368 return 0;
5751f490 369 }
55029ae4
DB
370 if (!prefixcmp(key, "url.")) {
371 struct rewrite *rewrite;
60e3aba9 372 name = key + 4;
55029ae4
DB
373 subkey = strrchr(name, '.');
374 if (!subkey)
375 return 0;
55029ae4 376 if (!strcmp(subkey, ".insteadof")) {
1c2eafb8
JT
377 rewrite = make_rewrite(&rewrites, name, subkey - name);
378 if (!value)
379 return config_error_nonbool(key);
380 add_instead_of(rewrite, xstrdup(value));
381 } else if (!strcmp(subkey, ".pushinsteadof")) {
382 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
55029ae4
DB
383 if (!value)
384 return config_error_nonbool(key);
385 add_instead_of(rewrite, xstrdup(value));
386 }
387 }
5751f490
DB
388 if (prefixcmp(key, "remote."))
389 return 0;
390 name = key + 7;
c82efafc
BC
391 if (*name == '/') {
392 warning("Config remote shorthand cannot begin with '/': %s",
393 name);
394 return 0;
395 }
5751f490
DB
396 subkey = strrchr(name, '.');
397 if (!subkey)
cd294bc3 398 return 0;
5751f490 399 remote = make_remote(name, subkey - name);
89cf4c70 400 remote->origin = REMOTE_CONFIG;
84bb2dfd
PB
401 if (!strcmp(subkey, ".mirror"))
402 remote->mirror = git_config_bool(key, value);
403 else if (!strcmp(subkey, ".skipdefaultupdate"))
404 remote->skip_default_update = git_config_bool(key, value);
7cc91a2f
BG
405 else if (!strcmp(subkey, ".skipfetchall"))
406 remote->skip_default_update = git_config_bool(key, value);
84bb2dfd
PB
407 else if (!strcmp(subkey, ".url")) {
408 const char *v;
409 if (git_config_string(&v, key, value))
410 return -1;
411 add_url(remote, v);
20346234
MG
412 } else if (!strcmp(subkey, ".pushurl")) {
413 const char *v;
414 if (git_config_string(&v, key, value))
415 return -1;
416 add_pushurl(remote, v);
5751f490 417 } else if (!strcmp(subkey, ".push")) {
84bb2dfd
PB
418 const char *v;
419 if (git_config_string(&v, key, value))
420 return -1;
421 add_push_refspec(remote, v);
5d46c9d4 422 } else if (!strcmp(subkey, ".fetch")) {
84bb2dfd
PB
423 const char *v;
424 if (git_config_string(&v, key, value))
425 return -1;
426 add_fetch_refspec(remote, v);
5751f490 427 } else if (!strcmp(subkey, ".receivepack")) {
84bb2dfd
PB
428 const char *v;
429 if (git_config_string(&v, key, value))
430 return -1;
5751f490 431 if (!remote->receivepack)
84bb2dfd 432 remote->receivepack = v;
5751f490
DB
433 else
434 error("more than one receivepack given, using the first");
0012ba21 435 } else if (!strcmp(subkey, ".uploadpack")) {
84bb2dfd
PB
436 const char *v;
437 if (git_config_string(&v, key, value))
438 return -1;
0012ba21 439 if (!remote->uploadpack)
84bb2dfd 440 remote->uploadpack = v;
0012ba21
DB
441 else
442 error("more than one uploadpack given, using the first");
d71ab174
DB
443 } else if (!strcmp(subkey, ".tagopt")) {
444 if (!strcmp(value, "--no-tags"))
445 remote->fetch_tags = -1;
944163a4
ST
446 else if (!strcmp(value, "--tags"))
447 remote->fetch_tags = 2;
14c98218 448 } else if (!strcmp(subkey, ".proxy")) {
84bb2dfd
PB
449 return git_config_string((const char **)&remote->http_proxy,
450 key, value);
c578f51d
DB
451 } else if (!strcmp(subkey, ".vcs")) {
452 return git_config_string(&remote->foreign_vcs, key, value);
84bb2dfd 453 }
5751f490
DB
454 return 0;
455}
456
55029ae4
DB
457static void alias_all_urls(void)
458{
459 int i, j;
460 for (i = 0; i < remotes_nr; i++) {
1c2eafb8 461 int add_pushurl_aliases;
55029ae4
DB
462 if (!remotes[i])
463 continue;
20346234 464 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
d071d942 465 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
20346234 466 }
1c2eafb8
JT
467 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
468 for (j = 0; j < remotes[i]->url_nr; j++) {
469 if (add_pushurl_aliases)
470 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
471 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
472 }
55029ae4
DB
473 }
474}
475
5751f490
DB
476static void read_config(void)
477{
478 unsigned char sha1[20];
479 const char *head_ref;
480 int flag;
2543d9b6 481 if (default_remote_name) /* did this already */
5751f490
DB
482 return;
483 default_remote_name = xstrdup("origin");
484 current_branch = NULL;
485 head_ref = resolve_ref("HEAD", sha1, 0, &flag);
486 if (head_ref && (flag & REF_ISSYMREF) &&
487 !prefixcmp(head_ref, "refs/heads/")) {
cf818348
DB
488 current_branch =
489 make_branch(head_ref + strlen("refs/heads/"), 0);
5751f490 490 }
ef90d6d4 491 git_config(handle_config, NULL);
55029ae4 492 alias_all_urls();
5751f490
DB
493}
494
2cb1f36d
BC
495/*
496 * This function frees a refspec array.
497 * Warning: code paths should be checked to ensure that the src
498 * and dst pointers are always freeable pointers as well
499 * as the refspec pointer itself.
500 */
697d7f5d 501static void free_refspecs(struct refspec *refspec, int nr_refspec)
2cb1f36d
BC
502{
503 int i;
504
505 if (!refspec)
506 return;
507
508 for (i = 0; i < nr_refspec; i++) {
509 free(refspec[i].src);
510 free(refspec[i].dst);
511 }
512 free(refspec);
513}
514
24b6177e 515static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
6b62816c
DB
516{
517 int i;
518 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
46220ca1 519
6b62816c 520 for (i = 0; i < nr_refspec; i++) {
47c6ef1c 521 size_t llen;
46220ca1
JH
522 int is_glob;
523 const char *lhs, *rhs;
8d9c5010 524 int flags;
46220ca1 525
8e76bf3f 526 is_glob = 0;
46220ca1
JH
527
528 lhs = refspec[i];
529 if (*lhs == '+') {
6b62816c 530 rs[i].force = 1;
46220ca1 531 lhs++;
6b62816c 532 }
46220ca1
JH
533
534 rhs = strrchr(lhs, ':');
a83619d6
PB
535
536 /*
537 * Before going on, special case ":" (or "+:") as a refspec
538 * for matching refs.
539 */
540 if (!fetch && rhs == lhs && rhs[1] == '\0') {
541 rs[i].matching = 1;
542 continue;
543 }
544
46220ca1 545 if (rhs) {
47c6ef1c 546 size_t rlen = strlen(++rhs);
abd2bde7 547 is_glob = (1 <= rlen && strchr(rhs, '*'));
08fbdb30 548 rs[i].dst = xstrndup(rhs, rlen);
6b62816c 549 }
ef00d150 550
46220ca1 551 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
abd2bde7 552 if (1 <= llen && memchr(lhs, '*', llen)) {
7d19da46
JH
553 if ((rhs && !is_glob) || (!rhs && fetch))
554 goto invalid;
555 is_glob = 1;
7d19da46
JH
556 } else if (rhs && is_glob) {
557 goto invalid;
ef00d150 558 }
7d19da46 559
46220ca1
JH
560 rs[i].pattern = is_glob;
561 rs[i].src = xstrndup(lhs, llen);
8d9c5010 562 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
46220ca1
JH
563
564 if (fetch) {
565 /*
566 * LHS
567 * - empty is allowed; it means HEAD.
568 * - otherwise it must be a valid looking ref.
569 */
570 if (!*rs[i].src)
571 ; /* empty is ok */
8d9c5010
MH
572 else if (check_refname_format(rs[i].src, flags))
573 goto invalid;
46220ca1
JH
574 /*
575 * RHS
7d19da46 576 * - missing is ok, and is same as empty.
46220ca1
JH
577 * - empty is ok; it means not to store.
578 * - otherwise it must be a valid looking ref.
579 */
8d9c5010 580 if (!rs[i].dst)
46220ca1 581 ; /* ok */
8d9c5010 582 else if (!*rs[i].dst)
46220ca1 583 ; /* ok */
8d9c5010
MH
584 else if (check_refname_format(rs[i].dst, flags))
585 goto invalid;
46220ca1
JH
586 } else {
587 /*
588 * LHS
589 * - empty is allowed; it means delete.
590 * - when wildcarded, it must be a valid looking ref.
591 * - otherwise, it must be an extended SHA-1, but
592 * there is no existing way to validate this.
593 */
594 if (!*rs[i].src)
595 ; /* empty is ok */
596 else if (is_glob) {
8d9c5010 597 if (check_refname_format(rs[i].src, flags))
46220ca1
JH
598 goto invalid;
599 }
600 else
601 ; /* anything goes, for now */
602 /*
603 * RHS
604 * - missing is allowed, but LHS then must be a
605 * valid looking ref.
606 * - empty is not allowed.
607 * - otherwise it must be a valid looking ref.
608 */
609 if (!rs[i].dst) {
8d9c5010 610 if (check_refname_format(rs[i].src, flags))
46220ca1
JH
611 goto invalid;
612 } else if (!*rs[i].dst) {
613 goto invalid;
614 } else {
8d9c5010 615 if (check_refname_format(rs[i].dst, flags))
46220ca1
JH
616 goto invalid;
617 }
ef00d150 618 }
6b62816c
DB
619 }
620 return rs;
46220ca1
JH
621
622 invalid:
24b6177e 623 if (verify) {
2cb1f36d
BC
624 /*
625 * nr_refspec must be greater than zero and i must be valid
626 * since it is only possible to reach this point from within
627 * the for loop above.
628 */
629 free_refspecs(rs, i+1);
24b6177e
JF
630 return NULL;
631 }
46220ca1
JH
632 die("Invalid refspec '%s'", refspec[i]);
633}
634
24b6177e
JF
635int valid_fetch_refspec(const char *fetch_refspec_str)
636{
24b6177e
JF
637 struct refspec *refspec;
638
66dbfd55 639 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
2cb1f36d 640 free_refspecs(refspec, 1);
24b6177e
JF
641 return !!refspec;
642}
643
46220ca1
JH
644struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
645{
24b6177e 646 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
46220ca1
JH
647}
648
697d7f5d 649static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
46220ca1 650{
24b6177e 651 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
6b62816c
DB
652}
653
72ff8943
DB
654void free_refspec(int nr_refspec, struct refspec *refspec)
655{
656 int i;
657 for (i = 0; i < nr_refspec; i++) {
658 free(refspec[i].src);
659 free(refspec[i].dst);
660 }
661 free(refspec);
662}
663
df93e33c
DB
664static int valid_remote_nick(const char *name)
665{
8ca12c0d 666 if (!name[0] || is_dot_or_dotdot(name))
df93e33c
DB
667 return 0;
668 return !strchr(name, '/'); /* no slash */
669}
670
5751f490
DB
671struct remote *remote_get(const char *name)
672{
673 struct remote *ret;
fa685bdf 674 int name_given = 0;
5751f490
DB
675
676 read_config();
fa685bdf
DB
677 if (name)
678 name_given = 1;
679 else {
5751f490 680 name = default_remote_name;
fa685bdf
DB
681 name_given = explicit_default_remote_name;
682 }
9326d494 683
5751f490 684 ret = make_remote(name, 0);
df93e33c 685 if (valid_remote_nick(name)) {
0a4da29d 686 if (!valid_remote(ret))
5751f490 687 read_remotes_file(ret);
0a4da29d 688 if (!valid_remote(ret))
5751f490
DB
689 read_branches_file(ret);
690 }
0a4da29d 691 if (name_given && !valid_remote(ret))
55029ae4 692 add_url_alias(ret, name);
0a4da29d 693 if (!valid_remote(ret))
5751f490 694 return NULL;
46220ca1
JH
695 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
696 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
5751f490
DB
697 return ret;
698}
6b62816c 699
9a23ba33
FAG
700int remote_is_configured(const char *name)
701{
702 int i;
703 read_config();
704
705 for (i = 0; i < remotes_nr; i++)
706 if (!strcmp(name, remotes[i]->name))
707 return 1;
708 return 0;
709}
710
b42f6927
JS
711int for_each_remote(each_remote_fn fn, void *priv)
712{
713 int i, result = 0;
714 read_config();
2d31347b 715 for (i = 0; i < remotes_nr && !result; i++) {
b42f6927
JS
716 struct remote *r = remotes[i];
717 if (!r)
718 continue;
719 if (!r->fetch)
46220ca1
JH
720 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
721 r->fetch_refspec);
b42f6927 722 if (!r->push)
46220ca1
JH
723 r->push = parse_push_refspec(r->push_refspec_nr,
724 r->push_refspec);
b42f6927
JS
725 result = fn(r, priv);
726 }
727 return result;
728}
729
2467a4fa
DB
730void ref_remove_duplicates(struct ref *ref_map)
731{
183113a5 732 struct string_list refs = STRING_LIST_INIT_NODUP;
73cf0822
JP
733 struct string_list_item *item = NULL;
734 struct ref *prev = NULL, *next = NULL;
735 for (; ref_map; prev = ref_map, ref_map = next) {
736 next = ref_map->next;
2467a4fa
DB
737 if (!ref_map->peer_ref)
738 continue;
73cf0822 739
e8c8b713 740 item = string_list_lookup(&refs, ref_map->peer_ref->name);
73cf0822
JP
741 if (item) {
742 if (strcmp(((struct ref *)item->util)->name,
743 ref_map->name))
744 die("%s tracks both %s and %s",
745 ref_map->peer_ref->name,
746 ((struct ref *)item->util)->name,
747 ref_map->name);
748 prev->next = ref_map->next;
749 free(ref_map->peer_ref);
750 free(ref_map);
95c96d48
JP
751 ref_map = prev; /* skip this; we freed it */
752 continue;
2467a4fa 753 }
73cf0822 754
78a395d3 755 item = string_list_insert(&refs, ref_map->peer_ref->name);
73cf0822 756 item->util = ref_map;
2467a4fa 757 }
73cf0822 758 string_list_clear(&refs, 0);
2467a4fa
DB
759}
760
28b91f8a 761int remote_has_url(struct remote *remote, const char *url)
5d46c9d4
DB
762{
763 int i;
28b91f8a
SP
764 for (i = 0; i < remote->url_nr; i++) {
765 if (!strcmp(remote->url[i], url))
5d46c9d4
DB
766 return 1;
767 }
768 return 0;
769}
770
e928213f
DB
771static int match_name_with_pattern(const char *key, const char *name,
772 const char *value, char **result)
a3c84239 773{
08fbdb30
DB
774 const char *kstar = strchr(key, '*');
775 size_t klen;
abd2bde7
DB
776 size_t ksuffixlen;
777 size_t namelen;
08fbdb30
DB
778 int ret;
779 if (!kstar)
780 die("Key '%s' of pattern had no '*'", key);
781 klen = kstar - key;
abd2bde7
DB
782 ksuffixlen = strlen(kstar + 1);
783 namelen = strlen(name);
784 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
785 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
e928213f 786 if (ret && value) {
08fbdb30
DB
787 const char *vstar = strchr(value, '*');
788 size_t vlen;
abd2bde7 789 size_t vsuffixlen;
08fbdb30
DB
790 if (!vstar)
791 die("Value '%s' of pattern has no '*'", value);
792 vlen = vstar - value;
abd2bde7
DB
793 vsuffixlen = strlen(vstar + 1);
794 *result = xmalloc(vlen + vsuffixlen +
e928213f 795 strlen(name) -
abd2bde7
DB
796 klen - ksuffixlen + 1);
797 strncpy(*result, value, vlen);
798 strncpy(*result + vlen,
799 name + klen, namelen - klen - ksuffixlen);
800 strcpy(*result + vlen + namelen - klen - ksuffixlen,
801 vstar + 1);
e928213f 802 }
a3c84239
DB
803 return ret;
804}
805
72ff8943
DB
806char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
807 const char *name)
808{
809 int i;
810 char *ret = NULL;
811 for (i = 0; i < nr_refspec; i++) {
812 struct refspec *refspec = refspecs + i;
813 if (refspec->pattern) {
814 if (match_name_with_pattern(refspec->src, name,
815 refspec->dst, &ret))
816 return ret;
817 } else if (!strcmp(refspec->src, name))
818 return strdup(refspec->dst);
819 }
820 return NULL;
821}
822
5d46c9d4
DB
823int remote_find_tracking(struct remote *remote, struct refspec *refspec)
824{
b42f6927
JS
825 int find_src = refspec->src == NULL;
826 char *needle, **result;
5d46c9d4 827 int i;
b42f6927
JS
828
829 if (find_src) {
009c5bcd 830 if (!refspec->dst)
b42f6927
JS
831 return error("find_tracking: need either src or dst");
832 needle = refspec->dst;
833 result = &refspec->src;
834 } else {
835 needle = refspec->src;
836 result = &refspec->dst;
837 }
838
5d46c9d4
DB
839 for (i = 0; i < remote->fetch_refspec_nr; i++) {
840 struct refspec *fetch = &remote->fetch[i];
b42f6927
JS
841 const char *key = find_src ? fetch->dst : fetch->src;
842 const char *value = find_src ? fetch->src : fetch->dst;
5d46c9d4
DB
843 if (!fetch->dst)
844 continue;
845 if (fetch->pattern) {
e928213f 846 if (match_name_with_pattern(key, needle, value, result)) {
5d46c9d4
DB
847 refspec->force = fetch->force;
848 return 0;
849 }
b42f6927
JS
850 } else if (!strcmp(needle, key)) {
851 *result = xstrdup(value);
852 refspec->force = fetch->force;
853 return 0;
5d46c9d4
DB
854 }
855 }
5d46c9d4
DB
856 return -1;
857}
858
8009768e
RS
859static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
860 const char *name)
861{
862 size_t len = strlen(name);
863 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
864 memcpy(ref->name, prefix, prefixlen);
865 memcpy(ref->name + prefixlen, name, len);
866 return ref;
867}
868
59c69c0c 869struct ref *alloc_ref(const char *name)
dfd255dd 870{
59c69c0c 871 return alloc_ref_with_prefix("", 0, name);
737922aa
KK
872}
873
59a57757 874struct ref *copy_ref(const struct ref *ref)
d71ab174 875{
7b3db095
JS
876 struct ref *cpy;
877 size_t len;
878 if (!ref)
879 return NULL;
880 len = strlen(ref->name);
881 cpy = xmalloc(sizeof(struct ref) + len + 1);
882 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
883 cpy->next = NULL;
884 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
885 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
886 cpy->peer_ref = copy_ref(ref->peer_ref);
887 return cpy;
d71ab174
DB
888}
889
4577370e
DB
890struct ref *copy_ref_list(const struct ref *ref)
891{
892 struct ref *ret = NULL;
893 struct ref **tail = &ret;
894 while (ref) {
895 *tail = copy_ref(ref);
896 ref = ref->next;
897 tail = &((*tail)->next);
898 }
899 return ret;
900}
901
697d7f5d 902static void free_ref(struct ref *ref)
be885d96
DB
903{
904 if (!ref)
905 return;
7b3db095 906 free_ref(ref->peer_ref);
be885d96
DB
907 free(ref->remote_status);
908 free(ref->symref);
909 free(ref);
910}
911
dfd255dd
DB
912void free_refs(struct ref *ref)
913{
914 struct ref *next;
915 while (ref) {
916 next = ref->next;
be885d96 917 free_ref(ref);
dfd255dd
DB
918 ref = next;
919 }
920}
921
6b62816c
DB
922static int count_refspec_match(const char *pattern,
923 struct ref *refs,
924 struct ref **matched_ref)
925{
926 int patlen = strlen(pattern);
927 struct ref *matched_weak = NULL;
928 struct ref *matched = NULL;
929 int weak_match = 0;
930 int match = 0;
931
932 for (weak_match = match = 0; refs; refs = refs->next) {
933 char *name = refs->name;
934 int namelen = strlen(name);
6b62816c 935
ae36bdcf 936 if (!refname_match(pattern, name, ref_rev_parse_rules))
6b62816c
DB
937 continue;
938
939 /* A match is "weak" if it is with refs outside
940 * heads or tags, and did not specify the pattern
941 * in full (e.g. "refs/remotes/origin/master") or at
942 * least from the toplevel (e.g. "remotes/origin/master");
943 * otherwise "git push $URL master" would result in
944 * ambiguity between remotes/origin/master and heads/master
945 * at the remote site.
946 */
947 if (namelen != patlen &&
948 patlen != namelen - 5 &&
949 prefixcmp(name, "refs/heads/") &&
950 prefixcmp(name, "refs/tags/")) {
951 /* We want to catch the case where only weak
952 * matches are found and there are multiple
953 * matches, and where more than one strong
954 * matches are found, as ambiguous. One
955 * strong match with zero or more weak matches
956 * are acceptable as a unique match.
957 */
958 matched_weak = refs;
959 weak_match++;
960 }
961 else {
962 matched = refs;
963 match++;
964 }
965 }
966 if (!matched) {
967 *matched_ref = matched_weak;
968 return weak_match;
969 }
970 else {
971 *matched_ref = matched;
972 return match;
973 }
974}
975
1d735267 976static void tail_link_ref(struct ref *ref, struct ref ***tail)
6b62816c
DB
977{
978 **tail = ref;
1d735267
DB
979 while (ref->next)
980 ref = ref->next;
6b62816c 981 *tail = &ref->next;
6b62816c
DB
982}
983
984static struct ref *try_explicit_object_name(const char *name)
985{
986 unsigned char sha1[20];
987 struct ref *ref;
6b62816c
DB
988
989 if (!*name) {
59c69c0c 990 ref = alloc_ref("(delete)");
6b62816c
DB
991 hashclr(ref->new_sha1);
992 return ref;
993 }
994 if (get_sha1(name, sha1))
995 return NULL;
59c69c0c 996 ref = alloc_ref(name);
6b62816c
DB
997 hashcpy(ref->new_sha1, sha1);
998 return ref;
999}
1000
1d735267 1001static struct ref *make_linked_ref(const char *name, struct ref ***tail)
6b62816c 1002{
59c69c0c 1003 struct ref *ret = alloc_ref(name);
1d735267
DB
1004 tail_link_ref(ret, tail);
1005 return ret;
163f0ee5 1006}
8558fd9e 1007
f8aae120
JK
1008static char *guess_ref(const char *name, struct ref *peer)
1009{
1010 struct strbuf buf = STRBUF_INIT;
1011 unsigned char sha1[20];
1012
1013 const char *r = resolve_ref(peer->name, sha1, 1, NULL);
1014 if (!r)
1015 return NULL;
1016
1017 if (!prefixcmp(r, "refs/heads/"))
1018 strbuf_addstr(&buf, "refs/heads/");
1019 else if (!prefixcmp(r, "refs/tags/"))
1020 strbuf_addstr(&buf, "refs/tags/");
1021 else
1022 return NULL;
1023
1024 strbuf_addstr(&buf, name);
1025 return strbuf_detach(&buf, NULL);
1026}
1027
54a8ad92
JH
1028static int match_explicit(struct ref *src, struct ref *dst,
1029 struct ref ***dst_tail,
9a7bbd1d 1030 struct refspec *rs)
6b62816c 1031{
54a8ad92 1032 struct ref *matched_src, *matched_dst;
cdf690e5 1033 int copy_src;
8558fd9e 1034
54a8ad92 1035 const char *dst_value = rs->dst;
f8aae120 1036 char *dst_guess;
6b62816c 1037
a83619d6 1038 if (rs->pattern || rs->matching)
9a7bbd1d 1039 return 0;
8558fd9e 1040
54a8ad92
JH
1041 matched_src = matched_dst = NULL;
1042 switch (count_refspec_match(rs->src, src, &matched_src)) {
1043 case 1:
cdf690e5 1044 copy_src = 1;
54a8ad92
JH
1045 break;
1046 case 0:
1047 /* The source could be in the get_sha1() format
1048 * not a reference name. :refs/other is a
1049 * way to delete 'other' ref at the remote end.
1050 */
1051 matched_src = try_explicit_object_name(rs->src);
7dfee372 1052 if (!matched_src)
9a7bbd1d 1053 return error("src refspec %s does not match any.", rs->src);
cdf690e5 1054 copy_src = 0;
54a8ad92
JH
1055 break;
1056 default:
9a7bbd1d 1057 return error("src refspec %s matches more than one.", rs->src);
54a8ad92 1058 }
3c8b7df1 1059
4491e62a 1060 if (!dst_value) {
9f0ea7e8
DB
1061 unsigned char sha1[20];
1062 int flag;
1063
9f0ea7e8
DB
1064 dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
1065 if (!dst_value ||
1066 ((flag & REF_ISSYMREF) &&
1067 prefixcmp(dst_value, "refs/heads/")))
1068 die("%s cannot be resolved to branch.",
1069 matched_src->name);
4491e62a 1070 }
3c8b7df1 1071
54a8ad92
JH
1072 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1073 case 1:
1074 break;
1075 case 0:
163f0ee5 1076 if (!memcmp(dst_value, "refs/", 5))
1d735267 1077 matched_dst = make_linked_ref(dst_value, dst_tail);
eeefa7c9 1078 else if ((dst_guess = guess_ref(dst_value, matched_src)))
f8aae120 1079 matched_dst = make_linked_ref(dst_guess, dst_tail);
3c8b7df1 1080 else
f8aae120
JK
1081 error("unable to push to unqualified destination: %s\n"
1082 "The destination refspec neither matches an "
1083 "existing ref on the remote nor\n"
1084 "begins with refs/, and we are unable to "
1085 "guess a prefix based on the source ref.",
1086 dst_value);
54a8ad92
JH
1087 break;
1088 default:
3c8b7df1 1089 matched_dst = NULL;
54a8ad92
JH
1090 error("dst refspec %s matches more than one.",
1091 dst_value);
1092 break;
1093 }
9a7bbd1d
JK
1094 if (!matched_dst)
1095 return -1;
1096 if (matched_dst->peer_ref)
1097 return error("dst ref %s receives from more than one src.",
54a8ad92 1098 matched_dst->name);
54a8ad92 1099 else {
cdf690e5 1100 matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
54a8ad92 1101 matched_dst->force = rs->force;
6b62816c 1102 }
9a7bbd1d 1103 return 0;
54a8ad92
JH
1104}
1105
1106static int match_explicit_refs(struct ref *src, struct ref *dst,
1107 struct ref ***dst_tail, struct refspec *rs,
1108 int rs_nr)
1109{
1110 int i, errs;
1111 for (i = errs = 0; i < rs_nr; i++)
9a7bbd1d
JK
1112 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1113 return errs;
6b62816c
DB
1114}
1115
6e66bf3c
AR
1116static const struct refspec *check_pattern_match(const struct refspec *rs,
1117 int rs_nr,
1118 const struct ref *src)
8558fd9e
DB
1119{
1120 int i;
a83619d6 1121 int matching_refs = -1;
8558fd9e 1122 for (i = 0; i < rs_nr; i++) {
a83619d6
PB
1123 if (rs[i].matching &&
1124 (matching_refs == -1 || rs[i].force)) {
1125 matching_refs = i;
1126 continue;
1127 }
1128
e928213f
DB
1129 if (rs[i].pattern && match_name_with_pattern(rs[i].src, src->name,
1130 NULL, NULL))
6e66bf3c 1131 return rs + i;
8558fd9e 1132 }
a83619d6
PB
1133 if (matching_refs != -1)
1134 return rs + matching_refs;
1135 else
1136 return NULL;
8558fd9e
DB
1137}
1138
6d2bf96e
CB
1139static struct ref **tail_ref(struct ref **head)
1140{
1141 struct ref **tail = head;
1142 while (*tail)
1143 tail = &((*tail)->next);
1144 return tail;
1145}
1146
54a8ad92
JH
1147/*
1148 * Note. This is used only by "push"; refspec matching rules for
1149 * push and fetch are subtly different, so do not try to reuse it
1150 * without thinking.
1151 */
6d2bf96e 1152int match_refs(struct ref *src, struct ref **dst,
28b9d6e5 1153 int nr_refspec, const char **refspec, int flags)
6b62816c 1154{
a83619d6 1155 struct refspec *rs;
28b9d6e5
AW
1156 int send_all = flags & MATCH_REFS_ALL;
1157 int send_mirror = flags & MATCH_REFS_MIRROR;
5f48cb95 1158 int errs;
2af202be 1159 static const char *default_refspec[] = { ":", NULL };
6d2bf96e 1160 struct ref **dst_tail = tail_ref(dst);
6b62816c 1161
a83619d6
PB
1162 if (!nr_refspec) {
1163 nr_refspec = 1;
1164 refspec = default_refspec;
1165 }
1166 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
6d2bf96e 1167 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
6b62816c
DB
1168
1169 /* pick the remainder */
1170 for ( ; src; src = src->next) {
1171 struct ref *dst_peer;
6e66bf3c
AR
1172 const struct refspec *pat = NULL;
1173 char *dst_name;
6b62816c
DB
1174 if (src->peer_ref)
1175 continue;
a83619d6
PB
1176
1177 pat = check_pattern_match(rs, nr_refspec, src);
1178 if (!pat)
1179 continue;
1180
1181 if (pat->matching) {
098e711e
JH
1182 /*
1183 * "matching refs"; traditionally we pushed everything
1184 * including refs outside refs/heads/ hierarchy, but
1185 * that does not make much sense these days.
1186 */
a83619d6
PB
1187 if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
1188 continue;
1189 dst_name = xstrdup(src->name);
8558fd9e 1190
a83619d6 1191 } else {
efd8f793 1192 const char *dst_side = pat->dst ? pat->dst : pat->src;
e928213f
DB
1193 if (!match_name_with_pattern(pat->src, src->name,
1194 dst_side, &dst_name))
1195 die("Didn't think it matches any more");
a83619d6 1196 }
6d2bf96e 1197 dst_peer = find_ref_by_name(*dst, dst_name);
a83619d6
PB
1198 if (dst_peer) {
1199 if (dst_peer->peer_ref)
1200 /* We're already sending something to this ref. */
1201 goto free_name;
1202
1203 } else {
1204 if (pat->matching && !(send_all || send_mirror))
1205 /*
1206 * Remote doesn't have it, and we have no
1207 * explicit pattern, and we don't have
1208 * --all nor --mirror.
1209 */
1210 goto free_name;
28b9d6e5 1211
6b62816c 1212 /* Create a new one and link it */
6d2bf96e 1213 dst_peer = make_linked_ref(dst_name, &dst_tail);
6b62816c 1214 hashcpy(dst_peer->new_sha1, src->new_sha1);
6b62816c 1215 }
cdf690e5 1216 dst_peer->peer_ref = copy_ref(src);
a83619d6 1217 dst_peer->force = pat->force;
6e66bf3c
AR
1218 free_name:
1219 free(dst_name);
6b62816c 1220 }
5f48cb95
JS
1221 if (errs)
1222 return -1;
6b62816c
DB
1223 return 0;
1224}
cf818348 1225
20e8b465
TRC
1226void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1227 int force_update)
1228{
1229 struct ref *ref;
1230
1231 for (ref = remote_refs; ref; ref = ref->next) {
1232 if (ref->peer_ref)
1233 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1234 else if (!send_mirror)
1235 continue;
1236
1237 ref->deletion = is_null_sha1(ref->new_sha1);
1238 if (!ref->deletion &&
1239 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1240 ref->status = REF_STATUS_UPTODATE;
1241 continue;
1242 }
1243
1244 /* This part determines what can overwrite what.
1245 * The rules are:
1246 *
1247 * (0) you can always use --force or +A:B notation to
1248 * selectively force individual ref pairs.
1249 *
1250 * (1) if the old thing does not exist, it is OK.
1251 *
1252 * (2) if you do not have the old thing, you are not allowed
1253 * to overwrite it; you would not know what you are losing
1254 * otherwise.
1255 *
1256 * (3) if both new and old are commit-ish, and new is a
1257 * descendant of old, it is OK.
1258 *
1259 * (4) regardless of all of the above, removing :B is
1260 * always allowed.
1261 */
1262
1263 ref->nonfastforward =
1264 !ref->deletion &&
1265 !is_null_sha1(ref->old_sha1) &&
1266 (!has_sha1_file(ref->old_sha1)
1267 || !ref_newer(ref->new_sha1, ref->old_sha1));
1268
1269 if (ref->nonfastforward && !ref->force && !force_update) {
1270 ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
1271 continue;
1272 }
1273 }
1274}
1275
cf818348
DB
1276struct branch *branch_get(const char *name)
1277{
1278 struct branch *ret;
1279
1280 read_config();
1281 if (!name || !*name || !strcmp(name, "HEAD"))
1282 ret = current_branch;
1283 else
1284 ret = make_branch(name, 0);
1285 if (ret && ret->remote_name) {
1286 ret->remote = remote_get(ret->remote_name);
1287 if (ret->merge_nr) {
1288 int i;
1289 ret->merge = xcalloc(sizeof(*ret->merge),
1290 ret->merge_nr);
1291 for (i = 0; i < ret->merge_nr; i++) {
1292 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1293 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
5e6e2b48
MG
1294 if (remote_find_tracking(ret->remote, ret->merge[i])
1295 && !strcmp(ret->remote_name, "."))
1296 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
cf818348
DB
1297 }
1298 }
1299 }
1300 return ret;
1301}
1302
1303int branch_has_merge_config(struct branch *branch)
1304{
1305 return branch && !!branch->merge;
1306}
1307
85682c19
SP
1308int branch_merge_matches(struct branch *branch,
1309 int i,
1310 const char *refname)
cf818348 1311{
85682c19 1312 if (!branch || i < 0 || i >= branch->merge_nr)
cf818348 1313 return 0;
605b4978 1314 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
cf818348 1315}
d71ab174 1316
4577370e 1317static struct ref *get_expanded_map(const struct ref *remote_refs,
d71ab174
DB
1318 const struct refspec *refspec)
1319{
4577370e 1320 const struct ref *ref;
d71ab174
DB
1321 struct ref *ret = NULL;
1322 struct ref **tail = &ret;
1323
e928213f 1324 char *expn_name;
d71ab174
DB
1325
1326 for (ref = remote_refs; ref; ref = ref->next) {
1327 if (strchr(ref->name, '^'))
1328 continue; /* a dereference item */
e928213f
DB
1329 if (match_name_with_pattern(refspec->src, ref->name,
1330 refspec->dst, &expn_name)) {
d71ab174 1331 struct ref *cpy = copy_ref(ref);
d71ab174 1332
e928213f
DB
1333 cpy->peer_ref = alloc_ref(expn_name);
1334 free(expn_name);
d71ab174
DB
1335 if (refspec->force)
1336 cpy->peer_ref->force = 1;
1337 *tail = cpy;
1338 tail = &cpy->next;
1339 }
1340 }
1341
1342 return ret;
1343}
1344
4577370e 1345static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
d71ab174 1346{
4577370e 1347 const struct ref *ref;
d71ab174 1348 for (ref = refs; ref; ref = ref->next) {
605b4978 1349 if (refname_match(name, ref->name, ref_fetch_rules))
d71ab174
DB
1350 return ref;
1351 }
1352 return NULL;
1353}
1354
4577370e 1355struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
d71ab174 1356{
4577370e 1357 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
d71ab174
DB
1358
1359 if (!ref)
9ad7c5ae 1360 return NULL;
d71ab174
DB
1361
1362 return copy_ref(ref);
1363}
1364
1365static struct ref *get_local_ref(const char *name)
1366{
3eb96997 1367 if (!name || name[0] == '\0')
d71ab174
DB
1368 return NULL;
1369
59c69c0c
RS
1370 if (!prefixcmp(name, "refs/"))
1371 return alloc_ref(name);
d71ab174
DB
1372
1373 if (!prefixcmp(name, "heads/") ||
1374 !prefixcmp(name, "tags/") ||
8009768e
RS
1375 !prefixcmp(name, "remotes/"))
1376 return alloc_ref_with_prefix("refs/", 5, name);
d71ab174 1377
8009768e 1378 return alloc_ref_with_prefix("refs/heads/", 11, name);
d71ab174
DB
1379}
1380
4577370e 1381int get_fetch_map(const struct ref *remote_refs,
d71ab174 1382 const struct refspec *refspec,
9ad7c5ae
JH
1383 struct ref ***tail,
1384 int missing_ok)
d71ab174 1385{
ef00d150 1386 struct ref *ref_map, **rmp;
d71ab174
DB
1387
1388 if (refspec->pattern) {
1389 ref_map = get_expanded_map(remote_refs, refspec);
1390 } else {
9ad7c5ae
JH
1391 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1392
1393 ref_map = get_remote_ref(remote_refs, name);
1394 if (!missing_ok && !ref_map)
1395 die("Couldn't find remote ref %s", name);
1396 if (ref_map) {
1397 ref_map->peer_ref = get_local_ref(refspec->dst);
1398 if (ref_map->peer_ref && refspec->force)
1399 ref_map->peer_ref->force = 1;
1400 }
d71ab174
DB
1401 }
1402
ef00d150
DB
1403 for (rmp = &ref_map; *rmp; ) {
1404 if ((*rmp)->peer_ref) {
8d9c5010
MH
1405 if (check_refname_format((*rmp)->peer_ref->name + 5,
1406 REFNAME_ALLOW_ONELEVEL)) {
ef00d150
DB
1407 struct ref *ignore = *rmp;
1408 error("* Ignoring funny ref '%s' locally",
1409 (*rmp)->peer_ref->name);
1410 *rmp = (*rmp)->next;
1411 free(ignore->peer_ref);
1412 free(ignore);
1413 continue;
1414 }
1415 }
1416 rmp = &((*rmp)->next);
d71ab174
DB
1417 }
1418
8f70a765
AR
1419 if (ref_map)
1420 tail_link_ref(ref_map, tail);
d71ab174
DB
1421
1422 return 0;
1423}
be885d96
DB
1424
1425int resolve_remote_symref(struct ref *ref, struct ref *list)
1426{
1427 if (!ref->symref)
1428 return 0;
1429 for (; list; list = list->next)
1430 if (!strcmp(ref->symref, list->name)) {
1431 hashcpy(ref->old_sha1, list->old_sha1);
1432 return 0;
1433 }
1434 return 1;
1435}
6d21bf96 1436
ec8452d5
JS
1437static void unmark_and_free(struct commit_list *list, unsigned int mark)
1438{
1439 while (list) {
1440 struct commit_list *temp = list;
1441 temp->item->object.flags &= ~mark;
1442 list = temp->next;
1443 free(temp);
1444 }
1445}
1446
1447int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1448{
1449 struct object *o;
1450 struct commit *old, *new;
1451 struct commit_list *list, *used;
1452 int found = 0;
1453
1454 /* Both new and old must be commit-ish and new is descendant of
1455 * old. Otherwise we require --force.
1456 */
1457 o = deref_tag(parse_object(old_sha1), NULL, 0);
1458 if (!o || o->type != OBJ_COMMIT)
1459 return 0;
1460 old = (struct commit *) o;
1461
1462 o = deref_tag(parse_object(new_sha1), NULL, 0);
1463 if (!o || o->type != OBJ_COMMIT)
1464 return 0;
1465 new = (struct commit *) o;
1466
1467 if (parse_commit(new) < 0)
1468 return 0;
1469
1470 used = list = NULL;
1471 commit_list_insert(new, &list);
1472 while (list) {
1473 new = pop_most_recent_commit(&list, TMP_MARK);
1474 commit_list_insert(new, &used);
1475 if (new == old) {
1476 found = 1;
1477 break;
1478 }
1479 }
1480 unmark_and_free(list, TMP_MARK);
1481 unmark_and_free(used, TMP_MARK);
1482 return found;
1483}
1484
6d21bf96
JH
1485/*
1486 * Return true if there is anything to report, otherwise false.
1487 */
1488int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1489{
1490 unsigned char sha1[20];
1491 struct commit *ours, *theirs;
1492 char symmetric[84];
1493 struct rev_info revs;
1494 const char *rev_argv[10], *base;
1495 int rev_argc;
1496
1497 /*
1498 * Nothing to report unless we are marked to build on top of
1499 * somebody else.
1500 */
1501 if (!branch ||
1502 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1503 return 0;
1504
1505 /*
1506 * If what we used to build on no longer exists, there is
1507 * nothing to report.
1508 */
1509 base = branch->merge[0]->dst;
1510 if (!resolve_ref(base, sha1, 1, NULL))
1511 return 0;
57ffc5f8 1512 theirs = lookup_commit_reference(sha1);
6d21bf96
JH
1513 if (!theirs)
1514 return 0;
1515
1516 if (!resolve_ref(branch->refname, sha1, 1, NULL))
1517 return 0;
57ffc5f8 1518 ours = lookup_commit_reference(sha1);
6d21bf96
JH
1519 if (!ours)
1520 return 0;
1521
1522 /* are we the same? */
1523 if (theirs == ours)
1524 return 0;
1525
8fbf879e 1526 /* Run "rev-list --left-right ours...theirs" internally... */
6d21bf96
JH
1527 rev_argc = 0;
1528 rev_argv[rev_argc++] = NULL;
1529 rev_argv[rev_argc++] = "--left-right";
1530 rev_argv[rev_argc++] = symmetric;
1531 rev_argv[rev_argc++] = "--";
1532 rev_argv[rev_argc] = NULL;
1533
1534 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1535 strcpy(symmetric + 40, "...");
1536 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1537
1538 init_revisions(&revs, NULL);
1539 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1540 prepare_revision_walk(&revs);
1541
1542 /* ... and count the commits on each side. */
1543 *num_ours = 0;
1544 *num_theirs = 0;
1545 while (1) {
1546 struct commit *c = get_revision(&revs);
1547 if (!c)
1548 break;
1549 if (c->object.flags & SYMMETRIC_LEFT)
1550 (*num_ours)++;
1551 else
1552 (*num_theirs)++;
1553 }
c0234b2e
JH
1554
1555 /* clear object flags smudged by the above traversal */
1556 clear_commit_marks(ours, ALL_REV_FLAGS);
1557 clear_commit_marks(theirs, ALL_REV_FLAGS);
6d21bf96
JH
1558 return 1;
1559}
1560
1561/*
1562 * Return true when there is anything to report, otherwise false.
1563 */
1564int format_tracking_info(struct branch *branch, struct strbuf *sb)
1565{
1566 int num_ours, num_theirs;
4de53ce0 1567 const char *base;
6d21bf96
JH
1568
1569 if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1570 return 0;
1571
1572 base = branch->merge[0]->dst;
45972ffb 1573 base = shorten_unambiguous_ref(base, 0);
6d21bf96 1574 if (!num_theirs)
4de53ce0 1575 strbuf_addf(sb, "Your branch is ahead of '%s' "
6d21bf96 1576 "by %d commit%s.\n",
4de53ce0 1577 base, num_ours, (num_ours == 1) ? "" : "s");
6d21bf96 1578 else if (!num_ours)
4de53ce0
AP
1579 strbuf_addf(sb, "Your branch is behind '%s' "
1580 "by %d commit%s, "
6d21bf96 1581 "and can be fast-forwarded.\n",
4de53ce0 1582 base, num_theirs, (num_theirs == 1) ? "" : "s");
6d21bf96 1583 else
4de53ce0
AP
1584 strbuf_addf(sb, "Your branch and '%s' have diverged,\n"
1585 "and have %d and %d different commit(s) each, "
1586 "respectively.\n",
1587 base, num_ours, num_theirs);
6d21bf96
JH
1588 return 1;
1589}
454e2025
JS
1590
1591static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1592{
1593 struct ref ***local_tail = cb_data;
1594 struct ref *ref;
1595 int len;
1596
1597 /* we already know it starts with refs/ to get here */
8d9c5010 1598 if (check_refname_format(refname + 5, 0))
454e2025
JS
1599 return 0;
1600
1601 len = strlen(refname) + 1;
1602 ref = xcalloc(1, sizeof(*ref) + len);
1603 hashcpy(ref->new_sha1, sha1);
1604 memcpy(ref->name, refname, len);
1605 **local_tail = ref;
1606 *local_tail = &ref->next;
1607 return 0;
1608}
1609
1610struct ref *get_local_heads(void)
1611{
55f0566f 1612 struct ref *local_refs = NULL, **local_tail = &local_refs;
454e2025
JS
1613 for_each_ref(one_local_ref, &local_tail);
1614 return local_refs;
1615}
8ef51733 1616
4229f1fa
JS
1617struct ref *guess_remote_head(const struct ref *head,
1618 const struct ref *refs,
1619 int all)
8ef51733 1620{
8ef51733 1621 const struct ref *r;
4229f1fa
JS
1622 struct ref *list = NULL;
1623 struct ref **tail = &list;
8ef51733 1624
6cb4e6cc 1625 if (!head)
8ef51733
JS
1626 return NULL;
1627
fbb074c2
JK
1628 /*
1629 * Some transports support directly peeking at
1630 * where HEAD points; if that is the case, then
1631 * we don't have to guess.
1632 */
1633 if (head->symref)
1634 return copy_ref(find_ref_by_name(refs, head->symref));
1635
8ef51733 1636 /* If refs/heads/master could be right, it is. */
4229f1fa
JS
1637 if (!all) {
1638 r = find_ref_by_name(refs, "refs/heads/master");
1639 if (r && !hashcmp(r->old_sha1, head->old_sha1))
1640 return copy_ref(r);
1641 }
8ef51733
JS
1642
1643 /* Look for another ref that points there */
4229f1fa 1644 for (r = refs; r; r = r->next) {
61adfd30
JK
1645 if (r != head &&
1646 !prefixcmp(r->name, "refs/heads/") &&
1647 !hashcmp(r->old_sha1, head->old_sha1)) {
4229f1fa
JS
1648 *tail = copy_ref(r);
1649 tail = &((*tail)->next);
1650 if (!all)
1651 break;
1652 }
1653 }
8ef51733 1654
4229f1fa 1655 return list;
8ef51733 1656}
f2ef6075
JS
1657
1658struct stale_heads_info {
1659 struct remote *remote;
1660 struct string_list *ref_names;
1661 struct ref **stale_refs_tail;
1662};
1663
1664static int get_stale_heads_cb(const char *refname,
1665 const unsigned char *sha1, int flags, void *cb_data)
1666{
1667 struct stale_heads_info *info = cb_data;
1668 struct refspec refspec;
1669 memset(&refspec, 0, sizeof(refspec));
1670 refspec.dst = (char *)refname;
1671 if (!remote_find_tracking(info->remote, &refspec)) {
1672 if (!((flags & REF_ISSYMREF) ||
1673 string_list_has_string(info->ref_names, refspec.src))) {
1674 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
1675 hashcpy(ref->new_sha1, sha1);
1676 }
1677 }
1678 return 0;
1679}
1680
1681struct ref *get_stale_heads(struct remote *remote, struct ref *fetch_map)
1682{
1683 struct ref *ref, *stale_refs = NULL;
183113a5 1684 struct string_list ref_names = STRING_LIST_INIT_NODUP;
f2ef6075
JS
1685 struct stale_heads_info info;
1686 info.remote = remote;
1687 info.ref_names = &ref_names;
1688 info.stale_refs_tail = &stale_refs;
1689 for (ref = fetch_map; ref; ref = ref->next)
1d2f80fa 1690 string_list_append(&ref_names, ref->name);
f2ef6075
JS
1691 sort_string_list(&ref_names);
1692 for_each_ref(get_stale_heads_cb, &info);
1693 string_list_clear(&ref_names, 0);
1694 return stale_refs;
1695}