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am: return control to caller, for housekeeping
[git/gitweb.git] / remote.c
blob68eb99bdf0ca3fedd02ab1bc93db7549b21b62d4
1 #include "cache.h"
2 #include "remote.h"
3 #include "refs.h"
4 #include "commit.h"
5 #include "diff.h"
6 #include "revision.h"
7 #include "dir.h"
8 #include "tag.h"
9 #include "string-list.h"
10 #include "mergesort.h"
11
12 enum map_direction { FROM_SRC, FROM_DST };
13
14 static struct refspec s_tag_refspec = {
15 0,
16 1,
17 0,
18 0,
19 "refs/tags/*",
20 "refs/tags/*"
21 };
22
23 const struct refspec *tag_refspec = &s_tag_refspec;
24
25 struct counted_string {
26 size_t len;
27 const char *s;
28 };
29 struct rewrite {
30 const char *base;
31 size_t baselen;
32 struct counted_string *instead_of;
33 int instead_of_nr;
34 int instead_of_alloc;
35 };
36 struct rewrites {
37 struct rewrite **rewrite;
38 int rewrite_alloc;
39 int rewrite_nr;
40 };
41
42 static struct remote **remotes;
43 static int remotes_alloc;
44 static int remotes_nr;
45
46 static struct branch **branches;
47 static int branches_alloc;
48 static int branches_nr;
49
50 static struct branch *current_branch;
51 static const char *default_remote_name;
52 static const char *pushremote_name;
53 static int explicit_default_remote_name;
54
55 static struct rewrites rewrites;
56 static struct rewrites rewrites_push;
57
58 #define BUF_SIZE (2048)
59 static char buffer[BUF_SIZE];
60
61 static int valid_remote(const struct remote *remote)
62 {
63 return (!!remote->url) || (!!remote->foreign_vcs);
64 }
65
66 static const char *alias_url(const char *url, struct rewrites *r)
67 {
68 int i, j;
69 char *ret;
70 struct counted_string *longest;
71 int longest_i;
72
73 longest = NULL;
74 longest_i = -1;
75 for (i = 0; i < r->rewrite_nr; i++) {
76 if (!r->rewrite[i])
77 continue;
78 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
79 if (!prefixcmp(url, r->rewrite[i]->instead_of[j].s) &&
80 (!longest ||
81 longest->len < r->rewrite[i]->instead_of[j].len)) {
82 longest = &(r->rewrite[i]->instead_of[j]);
83 longest_i = i;
84 }
85 }
86 }
87 if (!longest)
88 return url;
89
90 ret = xmalloc(r->rewrite[longest_i]->baselen +
91 (strlen(url) - longest->len) + 1);
92 strcpy(ret, r->rewrite[longest_i]->base);
93 strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
94 return ret;
95 }
96
97 static void add_push_refspec(struct remote *remote, const char *ref)
98 {
99 ALLOC_GROW(remote->push_refspec,
100 remote->push_refspec_nr + 1,
101 remote->push_refspec_alloc);
102 remote->push_refspec[remote->push_refspec_nr++] = ref;
103 }
104
105 static void add_fetch_refspec(struct remote *remote, const char *ref)
106 {
107 ALLOC_GROW(remote->fetch_refspec,
108 remote->fetch_refspec_nr + 1,
109 remote->fetch_refspec_alloc);
110 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
111 }
112
113 static void add_url(struct remote *remote, const char *url)
114 {
115 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
116 remote->url[remote->url_nr++] = url;
117 }
118
119 static void add_pushurl(struct remote *remote, const char *pushurl)
120 {
121 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
122 remote->pushurl[remote->pushurl_nr++] = pushurl;
123 }
124
125 static void add_pushurl_alias(struct remote *remote, const char *url)
126 {
127 const char *pushurl = alias_url(url, &rewrites_push);
128 if (pushurl != url)
129 add_pushurl(remote, pushurl);
130 }
131
132 static void add_url_alias(struct remote *remote, const char *url)
133 {
134 add_url(remote, alias_url(url, &rewrites));
135 add_pushurl_alias(remote, url);
136 }
137
138 static struct remote *make_remote(const char *name, int len)
139 {
140 struct remote *ret;
141 int i;
142
143 for (i = 0; i < remotes_nr; i++) {
144 if (len ? (!strncmp(name, remotes[i]->name, len) &&
145 !remotes[i]->name[len]) :
146 !strcmp(name, remotes[i]->name))
147 return remotes[i];
148 }
149
150 ret = xcalloc(1, sizeof(struct remote));
151 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
152 remotes[remotes_nr++] = ret;
153 if (len)
154 ret->name = xstrndup(name, len);
155 else
156 ret->name = xstrdup(name);
157 return ret;
158 }
159
160 static void add_merge(struct branch *branch, const char *name)
161 {
162 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
163 branch->merge_alloc);
164 branch->merge_name[branch->merge_nr++] = name;
165 }
166
167 static struct branch *make_branch(const char *name, int len)
168 {
169 struct branch *ret;
170 int i;
171 char *refname;
172
173 for (i = 0; i < branches_nr; i++) {
174 if (len ? (!strncmp(name, branches[i]->name, len) &&
175 !branches[i]->name[len]) :
176 !strcmp(name, branches[i]->name))
177 return branches[i];
178 }
179
180 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
181 ret = xcalloc(1, sizeof(struct branch));
182 branches[branches_nr++] = ret;
183 if (len)
184 ret->name = xstrndup(name, len);
185 else
186 ret->name = xstrdup(name);
187 refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
188 strcpy(refname, "refs/heads/");
189 strcpy(refname + strlen("refs/heads/"), ret->name);
190 ret->refname = refname;
191
192 return ret;
193 }
194
195 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
196 {
197 struct rewrite *ret;
198 int i;
199
200 for (i = 0; i < r->rewrite_nr; i++) {
201 if (len
202 ? (len == r->rewrite[i]->baselen &&
203 !strncmp(base, r->rewrite[i]->base, len))
204 : !strcmp(base, r->rewrite[i]->base))
205 return r->rewrite[i];
206 }
207
208 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
209 ret = xcalloc(1, sizeof(struct rewrite));
210 r->rewrite[r->rewrite_nr++] = ret;
211 if (len) {
212 ret->base = xstrndup(base, len);
213 ret->baselen = len;
214 }
215 else {
216 ret->base = xstrdup(base);
217 ret->baselen = strlen(base);
218 }
219 return ret;
220 }
221
222 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
223 {
224 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
225 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
226 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
227 rewrite->instead_of_nr++;
228 }
229
230 static void read_remotes_file(struct remote *remote)
231 {
232 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
233
234 if (!f)
235 return;
236 remote->origin = REMOTE_REMOTES;
237 while (fgets(buffer, BUF_SIZE, f)) {
238 int value_list;
239 char *s, *p;
240
241 if (!prefixcmp(buffer, "URL:")) {
242 value_list = 0;
243 s = buffer + 4;
244 } else if (!prefixcmp(buffer, "Push:")) {
245 value_list = 1;
246 s = buffer + 5;
247 } else if (!prefixcmp(buffer, "Pull:")) {
248 value_list = 2;
249 s = buffer + 5;
250 } else
251 continue;
252
253 while (isspace(*s))
254 s++;
255 if (!*s)
256 continue;
257
258 p = s + strlen(s);
259 while (isspace(p[-1]))
260 *--p = 0;
261
262 switch (value_list) {
263 case 0:
264 add_url_alias(remote, xstrdup(s));
265 break;
266 case 1:
267 add_push_refspec(remote, xstrdup(s));
268 break;
269 case 2:
270 add_fetch_refspec(remote, xstrdup(s));
271 break;
272 }
273 }
274 fclose(f);
275 }
276
277 static void read_branches_file(struct remote *remote)
278 {
279 const char *slash = strchr(remote->name, '/');
280 char *frag;
281 struct strbuf branch = STRBUF_INIT;
282 int n = slash ? slash - remote->name : 1000;
283 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
284 char *s, *p;
285 int len;
286
287 if (!f)
288 return;
289 s = fgets(buffer, BUF_SIZE, f);
290 fclose(f);
291 if (!s)
292 return;
293 while (isspace(*s))
294 s++;
295 if (!*s)
296 return;
297 remote->origin = REMOTE_BRANCHES;
298 p = s + strlen(s);
299 while (isspace(p[-1]))
300 *--p = 0;
301 len = p - s;
302 if (slash)
303 len += strlen(slash);
304 p = xmalloc(len + 1);
305 strcpy(p, s);
306 if (slash)
307 strcat(p, slash);
308
309 /*
310 * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
311 * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
312 * the partial URL obtained from the branches file plus
313 * "/netdev-2.6" and does not store it in any tracking ref.
314 * #branch specifier in the file is ignored.
315 *
316 * Otherwise, the branches file would have URL and optionally
317 * #branch specified. The "master" (or specified) branch is
318 * fetched and stored in the local branch of the same name.
319 */
320 frag = strchr(p, '#');
321 if (frag) {
322 *(frag++) = '\0';
323 strbuf_addf(&branch, "refs/heads/%s", frag);
324 } else
325 strbuf_addstr(&branch, "refs/heads/master");
326 if (!slash) {
327 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
328 } else {
329 strbuf_reset(&branch);
330 strbuf_addstr(&branch, "HEAD:");
331 }
332 add_url_alias(remote, p);
333 add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
334 /*
335 * Cogito compatible push: push current HEAD to remote #branch
336 * (master if missing)
337 */
338 strbuf_init(&branch, 0);
339 strbuf_addstr(&branch, "HEAD");
340 if (frag)
341 strbuf_addf(&branch, ":refs/heads/%s", frag);
342 else
343 strbuf_addstr(&branch, ":refs/heads/master");
344 add_push_refspec(remote, strbuf_detach(&branch, NULL));
345 remote->fetch_tags = 1; /* always auto-follow */
346 }
347
348 static int handle_config(const char *key, const char *value, void *cb)
349 {
350 const char *name;
351 const char *subkey;
352 struct remote *remote;
353 struct branch *branch;
354 if (!prefixcmp(key, "branch.")) {
355 name = key + 7;
356 subkey = strrchr(name, '.');
357 if (!subkey)
358 return 0;
359 branch = make_branch(name, subkey - name);
360 if (!strcmp(subkey, ".remote")) {
361 if (git_config_string(&branch->remote_name, key, value))
362 return -1;
363 if (branch == current_branch) {
364 default_remote_name = branch->remote_name;
365 explicit_default_remote_name = 1;
366 }
367 } else if (!strcmp(subkey, ".pushremote")) {
368 if (branch == current_branch)
369 if (git_config_string(&pushremote_name, key, value))
370 return -1;
371 } else if (!strcmp(subkey, ".merge")) {
372 if (!value)
373 return config_error_nonbool(key);
374 add_merge(branch, xstrdup(value));
375 }
376 return 0;
377 }
378 if (!prefixcmp(key, "url.")) {
379 struct rewrite *rewrite;
380 name = key + 4;
381 subkey = strrchr(name, '.');
382 if (!subkey)
383 return 0;
384 if (!strcmp(subkey, ".insteadof")) {
385 rewrite = make_rewrite(&rewrites, name, subkey - name);
386 if (!value)
387 return config_error_nonbool(key);
388 add_instead_of(rewrite, xstrdup(value));
389 } else if (!strcmp(subkey, ".pushinsteadof")) {
390 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
391 if (!value)
392 return config_error_nonbool(key);
393 add_instead_of(rewrite, xstrdup(value));
394 }
395 }
396
397 if (prefixcmp(key, "remote."))
398 return 0;
399 name = key + 7;
400
401 /* Handle remote.* variables */
402 if (!strcmp(name, "pushdefault"))
403 return git_config_string(&pushremote_name, key, value);
404
405 /* Handle remote.<name>.* variables */
406 if (*name == '/') {
407 warning("Config remote shorthand cannot begin with '/': %s",
408 name);
409 return 0;
410 }
411 subkey = strrchr(name, '.');
412 if (!subkey)
413 return 0;
414 remote = make_remote(name, subkey - name);
415 remote->origin = REMOTE_CONFIG;
416 if (!strcmp(subkey, ".mirror"))
417 remote->mirror = git_config_bool(key, value);
418 else if (!strcmp(subkey, ".skipdefaultupdate"))
419 remote->skip_default_update = git_config_bool(key, value);
420 else if (!strcmp(subkey, ".skipfetchall"))
421 remote->skip_default_update = git_config_bool(key, value);
422 else if (!strcmp(subkey, ".url")) {
423 const char *v;
424 if (git_config_string(&v, key, value))
425 return -1;
426 add_url(remote, v);
427 } else if (!strcmp(subkey, ".pushurl")) {
428 const char *v;
429 if (git_config_string(&v, key, value))
430 return -1;
431 add_pushurl(remote, v);
432 } else if (!strcmp(subkey, ".push")) {
433 const char *v;
434 if (git_config_string(&v, key, value))
435 return -1;
436 add_push_refspec(remote, v);
437 } else if (!strcmp(subkey, ".fetch")) {
438 const char *v;
439 if (git_config_string(&v, key, value))
440 return -1;
441 add_fetch_refspec(remote, v);
442 } else if (!strcmp(subkey, ".receivepack")) {
443 const char *v;
444 if (git_config_string(&v, key, value))
445 return -1;
446 if (!remote->receivepack)
447 remote->receivepack = v;
448 else
449 error("more than one receivepack given, using the first");
450 } else if (!strcmp(subkey, ".uploadpack")) {
451 const char *v;
452 if (git_config_string(&v, key, value))
453 return -1;
454 if (!remote->uploadpack)
455 remote->uploadpack = v;
456 else
457 error("more than one uploadpack given, using the first");
458 } else if (!strcmp(subkey, ".tagopt")) {
459 if (!strcmp(value, "--no-tags"))
460 remote->fetch_tags = -1;
461 else if (!strcmp(value, "--tags"))
462 remote->fetch_tags = 2;
463 } else if (!strcmp(subkey, ".proxy")) {
464 return git_config_string((const char **)&remote->http_proxy,
465 key, value);
466 } else if (!strcmp(subkey, ".vcs")) {
467 return git_config_string(&remote->foreign_vcs, key, value);
468 }
469 return 0;
470 }
471
472 static void alias_all_urls(void)
473 {
474 int i, j;
475 for (i = 0; i < remotes_nr; i++) {
476 int add_pushurl_aliases;
477 if (!remotes[i])
478 continue;
479 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
480 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
481 }
482 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
483 for (j = 0; j < remotes[i]->url_nr; j++) {
484 if (add_pushurl_aliases)
485 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
486 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
487 }
488 }
489 }
490
491 static void read_config(void)
492 {
493 unsigned char sha1[20];
494 const char *head_ref;
495 int flag;
496 if (default_remote_name) /* did this already */
497 return;
498 default_remote_name = xstrdup("origin");
499 current_branch = NULL;
500 head_ref = resolve_ref_unsafe("HEAD", sha1, 0, &flag);
501 if (head_ref && (flag & REF_ISSYMREF) &&
502 !prefixcmp(head_ref, "refs/heads/")) {
503 current_branch =
504 make_branch(head_ref + strlen("refs/heads/"), 0);
505 }
506 git_config(handle_config, NULL);
507 alias_all_urls();
508 }
509
510 /*
511 * This function frees a refspec array.
512 * Warning: code paths should be checked to ensure that the src
513 * and dst pointers are always freeable pointers as well
514 * as the refspec pointer itself.
515 */
516 static void free_refspecs(struct refspec *refspec, int nr_refspec)
517 {
518 int i;
519
520 if (!refspec)
521 return;
522
523 for (i = 0; i < nr_refspec; i++) {
524 free(refspec[i].src);
525 free(refspec[i].dst);
526 }
527 free(refspec);
528 }
529
530 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
531 {
532 int i;
533 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
534
535 for (i = 0; i < nr_refspec; i++) {
536 size_t llen;
537 int is_glob;
538 const char *lhs, *rhs;
539 int flags;
540
541 is_glob = 0;
542
543 lhs = refspec[i];
544 if (*lhs == '+') {
545 rs[i].force = 1;
546 lhs++;
547 }
548
549 rhs = strrchr(lhs, ':');
550
551 /*
552 * Before going on, special case ":" (or "+:") as a refspec
553 * for pushing matching refs.
554 */
555 if (!fetch && rhs == lhs && rhs[1] == '\0') {
556 rs[i].matching = 1;
557 continue;
558 }
559
560 if (rhs) {
561 size_t rlen = strlen(++rhs);
562 is_glob = (1 <= rlen && strchr(rhs, '*'));
563 rs[i].dst = xstrndup(rhs, rlen);
564 }
565
566 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
567 if (1 <= llen && memchr(lhs, '*', llen)) {
568 if ((rhs && !is_glob) || (!rhs && fetch))
569 goto invalid;
570 is_glob = 1;
571 } else if (rhs && is_glob) {
572 goto invalid;
573 }
574
575 rs[i].pattern = is_glob;
576 rs[i].src = xstrndup(lhs, llen);
577 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
578
579 if (fetch) {
580 unsigned char unused[40];
581
582 /* LHS */
583 if (!*rs[i].src)
584 ; /* empty is ok; it means "HEAD" */
585 else if (llen == 40 && !get_sha1_hex(rs[i].src, unused))
586 rs[i].exact_sha1 = 1; /* ok */
587 else if (!check_refname_format(rs[i].src, flags))
588 ; /* valid looking ref is ok */
589 else
590 goto invalid;
591 /* RHS */
592 if (!rs[i].dst)
593 ; /* missing is ok; it is the same as empty */
594 else if (!*rs[i].dst)
595 ; /* empty is ok; it means "do not store" */
596 else if (!check_refname_format(rs[i].dst, flags))
597 ; /* valid looking ref is ok */
598 else
599 goto invalid;
600 } else {
601 /*
602 * LHS
603 * - empty is allowed; it means delete.
604 * - when wildcarded, it must be a valid looking ref.
605 * - otherwise, it must be an extended SHA-1, but
606 * there is no existing way to validate this.
607 */
608 if (!*rs[i].src)
609 ; /* empty is ok */
610 else if (is_glob) {
611 if (check_refname_format(rs[i].src, flags))
612 goto invalid;
613 }
614 else
615 ; /* anything goes, for now */
616 /*
617 * RHS
618 * - missing is allowed, but LHS then must be a
619 * valid looking ref.
620 * - empty is not allowed.
621 * - otherwise it must be a valid looking ref.
622 */
623 if (!rs[i].dst) {
624 if (check_refname_format(rs[i].src, flags))
625 goto invalid;
626 } else if (!*rs[i].dst) {
627 goto invalid;
628 } else {
629 if (check_refname_format(rs[i].dst, flags))
630 goto invalid;
631 }
632 }
633 }
634 return rs;
635
636 invalid:
637 if (verify) {
638 /*
639 * nr_refspec must be greater than zero and i must be valid
640 * since it is only possible to reach this point from within
641 * the for loop above.
642 */
643 free_refspecs(rs, i+1);
644 return NULL;
645 }
646 die("Invalid refspec '%s'", refspec[i]);
647 }
648
649 int valid_fetch_refspec(const char *fetch_refspec_str)
650 {
651 struct refspec *refspec;
652
653 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
654 free_refspecs(refspec, 1);
655 return !!refspec;
656 }
657
658 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
659 {
660 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
661 }
662
663 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
664 {
665 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
666 }
667
668 void free_refspec(int nr_refspec, struct refspec *refspec)
669 {
670 int i;
671 for (i = 0; i < nr_refspec; i++) {
672 free(refspec[i].src);
673 free(refspec[i].dst);
674 }
675 free(refspec);
676 }
677
678 static int valid_remote_nick(const char *name)
679 {
680 if (!name[0] || is_dot_or_dotdot(name))
681 return 0;
682 return !strchr(name, '/'); /* no slash */
683 }
684
685 static struct remote *remote_get_1(const char *name, const char *pushremote_name)
686 {
687 struct remote *ret;
688 int name_given = 0;
689
690 if (name)
691 name_given = 1;
692 else {
693 if (pushremote_name) {
694 name = pushremote_name;
695 name_given = 1;
696 } else {
697 name = default_remote_name;
698 name_given = explicit_default_remote_name;
699 }
700 }
701
702 ret = make_remote(name, 0);
703 if (valid_remote_nick(name)) {
704 if (!valid_remote(ret))
705 read_remotes_file(ret);
706 if (!valid_remote(ret))
707 read_branches_file(ret);
708 }
709 if (name_given && !valid_remote(ret))
710 add_url_alias(ret, name);
711 if (!valid_remote(ret))
712 return NULL;
713 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
714 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
715 return ret;
716 }
717
718 struct remote *remote_get(const char *name)
719 {
720 read_config();
721 return remote_get_1(name, NULL);
722 }
723
724 struct remote *pushremote_get(const char *name)
725 {
726 read_config();
727 return remote_get_1(name, pushremote_name);
728 }
729
730 int remote_is_configured(const char *name)
731 {
732 int i;
733 read_config();
734
735 for (i = 0; i < remotes_nr; i++)
736 if (!strcmp(name, remotes[i]->name))
737 return 1;
738 return 0;
739 }
740
741 int for_each_remote(each_remote_fn fn, void *priv)
742 {
743 int i, result = 0;
744 read_config();
745 for (i = 0; i < remotes_nr && !result; i++) {
746 struct remote *r = remotes[i];
747 if (!r)
748 continue;
749 if (!r->fetch)
750 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
751 r->fetch_refspec);
752 if (!r->push)
753 r->push = parse_push_refspec(r->push_refspec_nr,
754 r->push_refspec);
755 result = fn(r, priv);
756 }
757 return result;
758 }
759
760 void ref_remove_duplicates(struct ref *ref_map)
761 {
762 struct string_list refs = STRING_LIST_INIT_NODUP;
763 struct string_list_item *item = NULL;
764 struct ref *prev = NULL, *next = NULL;
765 for (; ref_map; prev = ref_map, ref_map = next) {
766 next = ref_map->next;
767 if (!ref_map->peer_ref)
768 continue;
769
770 item = string_list_lookup(&refs, ref_map->peer_ref->name);
771 if (item) {
772 if (strcmp(((struct ref *)item->util)->name,
773 ref_map->name))
774 die("%s tracks both %s and %s",
775 ref_map->peer_ref->name,
776 ((struct ref *)item->util)->name,
777 ref_map->name);
778 prev->next = ref_map->next;
779 free(ref_map->peer_ref);
780 free(ref_map);
781 ref_map = prev; /* skip this; we freed it */
782 continue;
783 }
784
785 item = string_list_insert(&refs, ref_map->peer_ref->name);
786 item->util = ref_map;
787 }
788 string_list_clear(&refs, 0);
789 }
790
791 int remote_has_url(struct remote *remote, const char *url)
792 {
793 int i;
794 for (i = 0; i < remote->url_nr; i++) {
795 if (!strcmp(remote->url[i], url))
796 return 1;
797 }
798 return 0;
799 }
800
801 static int match_name_with_pattern(const char *key, const char *name,
802 const char *value, char **result)
803 {
804 const char *kstar = strchr(key, '*');
805 size_t klen;
806 size_t ksuffixlen;
807 size_t namelen;
808 int ret;
809 if (!kstar)
810 die("Key '%s' of pattern had no '*'", key);
811 klen = kstar - key;
812 ksuffixlen = strlen(kstar + 1);
813 namelen = strlen(name);
814 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
815 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
816 if (ret && value) {
817 const char *vstar = strchr(value, '*');
818 size_t vlen;
819 size_t vsuffixlen;
820 if (!vstar)
821 die("Value '%s' of pattern has no '*'", value);
822 vlen = vstar - value;
823 vsuffixlen = strlen(vstar + 1);
824 *result = xmalloc(vlen + vsuffixlen +
825 strlen(name) -
826 klen - ksuffixlen + 1);
827 strncpy(*result, value, vlen);
828 strncpy(*result + vlen,
829 name + klen, namelen - klen - ksuffixlen);
830 strcpy(*result + vlen + namelen - klen - ksuffixlen,
831 vstar + 1);
832 }
833 return ret;
834 }
835
836 static int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
837 {
838 int i;
839 int find_src = !query->src;
840
841 if (find_src && !query->dst)
842 return error("query_refspecs: need either src or dst");
843
844 for (i = 0; i < ref_count; i++) {
845 struct refspec *refspec = &refs[i];
846 const char *key = find_src ? refspec->dst : refspec->src;
847 const char *value = find_src ? refspec->src : refspec->dst;
848 const char *needle = find_src ? query->dst : query->src;
849 char **result = find_src ? &query->src : &query->dst;
850
851 if (!refspec->dst)
852 continue;
853 if (refspec->pattern) {
854 if (match_name_with_pattern(key, needle, value, result)) {
855 query->force = refspec->force;
856 return 0;
857 }
858 } else if (!strcmp(needle, key)) {
859 *result = xstrdup(value);
860 query->force = refspec->force;
861 return 0;
862 }
863 }
864 return -1;
865 }
866
867 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
868 const char *name)
869 {
870 struct refspec query;
871
872 memset(&query, 0, sizeof(struct refspec));
873 query.src = (char *)name;
874
875 if (query_refspecs(refspecs, nr_refspec, &query))
876 return NULL;
877
878 return query.dst;
879 }
880
881 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
882 {
883 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
884 }
885
886 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
887 const char *name)
888 {
889 size_t len = strlen(name);
890 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
891 memcpy(ref->name, prefix, prefixlen);
892 memcpy(ref->name + prefixlen, name, len);
893 return ref;
894 }
895
896 struct ref *alloc_ref(const char *name)
897 {
898 return alloc_ref_with_prefix("", 0, name);
899 }
900
901 struct ref *copy_ref(const struct ref *ref)
902 {
903 struct ref *cpy;
904 size_t len;
905 if (!ref)
906 return NULL;
907 len = strlen(ref->name);
908 cpy = xmalloc(sizeof(struct ref) + len + 1);
909 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
910 cpy->next = NULL;
911 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
912 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
913 cpy->peer_ref = copy_ref(ref->peer_ref);
914 return cpy;
915 }
916
917 struct ref *copy_ref_list(const struct ref *ref)
918 {
919 struct ref *ret = NULL;
920 struct ref **tail = &ret;
921 while (ref) {
922 *tail = copy_ref(ref);
923 ref = ref->next;
924 tail = &((*tail)->next);
925 }
926 return ret;
927 }
928
929 static void free_ref(struct ref *ref)
930 {
931 if (!ref)
932 return;
933 free_ref(ref->peer_ref);
934 free(ref->remote_status);
935 free(ref->symref);
936 free(ref);
937 }
938
939 void free_refs(struct ref *ref)
940 {
941 struct ref *next;
942 while (ref) {
943 next = ref->next;
944 free_ref(ref);
945 ref = next;
946 }
947 }
948
949 int ref_compare_name(const void *va, const void *vb)
950 {
951 const struct ref *a = va, *b = vb;
952 return strcmp(a->name, b->name);
953 }
954
955 static void *ref_list_get_next(const void *a)
956 {
957 return ((const struct ref *)a)->next;
958 }
959
960 static void ref_list_set_next(void *a, void *next)
961 {
962 ((struct ref *)a)->next = next;
963 }
964
965 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
966 {
967 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
968 }
969
970 static int count_refspec_match(const char *pattern,
971 struct ref *refs,
972 struct ref **matched_ref)
973 {
974 int patlen = strlen(pattern);
975 struct ref *matched_weak = NULL;
976 struct ref *matched = NULL;
977 int weak_match = 0;
978 int match = 0;
979
980 for (weak_match = match = 0; refs; refs = refs->next) {
981 char *name = refs->name;
982 int namelen = strlen(name);
983
984 if (!refname_match(pattern, name, ref_rev_parse_rules))
985 continue;
986
987 /* A match is "weak" if it is with refs outside
988 * heads or tags, and did not specify the pattern
989 * in full (e.g. "refs/remotes/origin/master") or at
990 * least from the toplevel (e.g. "remotes/origin/master");
991 * otherwise "git push $URL master" would result in
992 * ambiguity between remotes/origin/master and heads/master
993 * at the remote site.
994 */
995 if (namelen != patlen &&
996 patlen != namelen - 5 &&
997 prefixcmp(name, "refs/heads/") &&
998 prefixcmp(name, "refs/tags/")) {
999 /* We want to catch the case where only weak
1000 * matches are found and there are multiple
1001 * matches, and where more than one strong
1002 * matches are found, as ambiguous. One
1003 * strong match with zero or more weak matches
1004 * are acceptable as a unique match.
1005 */
1006 matched_weak = refs;
1007 weak_match++;
1008 }
1009 else {
1010 matched = refs;
1011 match++;
1012 }
1013 }
1014 if (!matched) {
1015 *matched_ref = matched_weak;
1016 return weak_match;
1017 }
1018 else {
1019 *matched_ref = matched;
1020 return match;
1021 }
1022 }
1023
1024 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1025 {
1026 **tail = ref;
1027 while (ref->next)
1028 ref = ref->next;
1029 *tail = &ref->next;
1030 }
1031
1032 static struct ref *alloc_delete_ref(void)
1033 {
1034 struct ref *ref = alloc_ref("(delete)");
1035 hashclr(ref->new_sha1);
1036 return ref;
1037 }
1038
1039 static struct ref *try_explicit_object_name(const char *name)
1040 {
1041 unsigned char sha1[20];
1042 struct ref *ref;
1043
1044 if (!*name)
1045 return alloc_delete_ref();
1046 if (get_sha1(name, sha1))
1047 return NULL;
1048 ref = alloc_ref(name);
1049 hashcpy(ref->new_sha1, sha1);
1050 return ref;
1051 }
1052
1053 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1054 {
1055 struct ref *ret = alloc_ref(name);
1056 tail_link_ref(ret, tail);
1057 return ret;
1058 }
1059
1060 static char *guess_ref(const char *name, struct ref *peer)
1061 {
1062 struct strbuf buf = STRBUF_INIT;
1063 unsigned char sha1[20];
1064
1065 const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
1066 if (!r)
1067 return NULL;
1068
1069 if (!prefixcmp(r, "refs/heads/"))
1070 strbuf_addstr(&buf, "refs/heads/");
1071 else if (!prefixcmp(r, "refs/tags/"))
1072 strbuf_addstr(&buf, "refs/tags/");
1073 else
1074 return NULL;
1075
1076 strbuf_addstr(&buf, name);
1077 return strbuf_detach(&buf, NULL);
1078 }
1079
1080 static int match_explicit(struct ref *src, struct ref *dst,
1081 struct ref ***dst_tail,
1082 struct refspec *rs)
1083 {
1084 struct ref *matched_src, *matched_dst;
1085 int copy_src;
1086
1087 const char *dst_value = rs->dst;
1088 char *dst_guess;
1089
1090 if (rs->pattern || rs->matching)
1091 return 0;
1092
1093 matched_src = matched_dst = NULL;
1094 switch (count_refspec_match(rs->src, src, &matched_src)) {
1095 case 1:
1096 copy_src = 1;
1097 break;
1098 case 0:
1099 /* The source could be in the get_sha1() format
1100 * not a reference name. :refs/other is a
1101 * way to delete 'other' ref at the remote end.
1102 */
1103 matched_src = try_explicit_object_name(rs->src);
1104 if (!matched_src)
1105 return error("src refspec %s does not match any.", rs->src);
1106 copy_src = 0;
1107 break;
1108 default:
1109 return error("src refspec %s matches more than one.", rs->src);
1110 }
1111
1112 if (!dst_value) {
1113 unsigned char sha1[20];
1114 int flag;
1115
1116 dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
1117 if (!dst_value ||
1118 ((flag & REF_ISSYMREF) &&
1119 prefixcmp(dst_value, "refs/heads/")))
1120 die("%s cannot be resolved to branch.",
1121 matched_src->name);
1122 }
1123
1124 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1125 case 1:
1126 break;
1127 case 0:
1128 if (!memcmp(dst_value, "refs/", 5))
1129 matched_dst = make_linked_ref(dst_value, dst_tail);
1130 else if (is_null_sha1(matched_src->new_sha1))
1131 error("unable to delete '%s': remote ref does not exist",
1132 dst_value);
1133 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1134 matched_dst = make_linked_ref(dst_guess, dst_tail);
1135 else
1136 error("unable to push to unqualified destination: %s\n"
1137 "The destination refspec neither matches an "
1138 "existing ref on the remote nor\n"
1139 "begins with refs/, and we are unable to "
1140 "guess a prefix based on the source ref.",
1141 dst_value);
1142 break;
1143 default:
1144 matched_dst = NULL;
1145 error("dst refspec %s matches more than one.",
1146 dst_value);
1147 break;
1148 }
1149 if (!matched_dst)
1150 return -1;
1151 if (matched_dst->peer_ref)
1152 return error("dst ref %s receives from more than one src.",
1153 matched_dst->name);
1154 else {
1155 matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1156 matched_dst->force = rs->force;
1157 }
1158 return 0;
1159 }
1160
1161 static int match_explicit_refs(struct ref *src, struct ref *dst,
1162 struct ref ***dst_tail, struct refspec *rs,
1163 int rs_nr)
1164 {
1165 int i, errs;
1166 for (i = errs = 0; i < rs_nr; i++)
1167 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1168 return errs;
1169 }
1170
1171 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1172 int send_mirror, int direction, const struct refspec **ret_pat)
1173 {
1174 const struct refspec *pat;
1175 char *name;
1176 int i;
1177 int matching_refs = -1;
1178 for (i = 0; i < rs_nr; i++) {
1179 if (rs[i].matching &&
1180 (matching_refs == -1 || rs[i].force)) {
1181 matching_refs = i;
1182 continue;
1183 }
1184
1185 if (rs[i].pattern) {
1186 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1187 int match;
1188 if (direction == FROM_SRC)
1189 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1190 else
1191 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1192 if (match) {
1193 matching_refs = i;
1194 break;
1195 }
1196 }
1197 }
1198 if (matching_refs == -1)
1199 return NULL;
1200
1201 pat = rs + matching_refs;
1202 if (pat->matching) {
1203 /*
1204 * "matching refs"; traditionally we pushed everything
1205 * including refs outside refs/heads/ hierarchy, but
1206 * that does not make much sense these days.
1207 */
1208 if (!send_mirror && prefixcmp(ref->name, "refs/heads/"))
1209 return NULL;
1210 name = xstrdup(ref->name);
1211 }
1212 if (ret_pat)
1213 *ret_pat = pat;
1214 return name;
1215 }
1216
1217 static struct ref **tail_ref(struct ref **head)
1218 {
1219 struct ref **tail = head;
1220 while (*tail)
1221 tail = &((*tail)->next);
1222 return tail;
1223 }
1224
1225 struct tips {
1226 struct commit **tip;
1227 int nr, alloc;
1228 };
1229
1230 static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1231 {
1232 struct commit *commit;
1233
1234 if (is_null_sha1(sha1))
1235 return;
1236 commit = lookup_commit_reference_gently(sha1, 1);
1237 if (!commit || (commit->object.flags & TMP_MARK))
1238 return;
1239 commit->object.flags |= TMP_MARK;
1240 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1241 tips->tip[tips->nr++] = commit;
1242 }
1243
1244 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1245 {
1246 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1247 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1248 struct string_list_item *item;
1249 struct ref *ref;
1250 struct tips sent_tips;
1251
1252 /*
1253 * Collect everything we know they would have at the end of
1254 * this push, and collect all tags they have.
1255 */
1256 memset(&sent_tips, 0, sizeof(sent_tips));
1257 for (ref = *dst; ref; ref = ref->next) {
1258 if (ref->peer_ref &&
1259 !is_null_sha1(ref->peer_ref->new_sha1))
1260 add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1261 else
1262 add_to_tips(&sent_tips, ref->old_sha1);
1263 if (!prefixcmp(ref->name, "refs/tags/"))
1264 string_list_append(&dst_tag, ref->name);
1265 }
1266 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1267
1268 sort_string_list(&dst_tag);
1269
1270 /* Collect tags they do not have. */
1271 for (ref = src; ref; ref = ref->next) {
1272 if (prefixcmp(ref->name, "refs/tags/"))
1273 continue; /* not a tag */
1274 if (string_list_has_string(&dst_tag, ref->name))
1275 continue; /* they already have it */
1276 if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1277 continue; /* be conservative */
1278 item = string_list_append(&src_tag, ref->name);
1279 item->util = ref;
1280 }
1281 string_list_clear(&dst_tag, 0);
1282
1283 /*
1284 * At this point, src_tag lists tags that are missing from
1285 * dst, and sent_tips lists the tips we are pushing or those
1286 * that we know they already have. An element in the src_tag
1287 * that is an ancestor of any of the sent_tips needs to be
1288 * sent to the other side.
1289 */
1290 if (sent_tips.nr) {
1291 for_each_string_list_item(item, &src_tag) {
1292 struct ref *ref = item->util;
1293 struct ref *dst_ref;
1294 struct commit *commit;
1295
1296 if (is_null_sha1(ref->new_sha1))
1297 continue;
1298 commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1299 if (!commit)
1300 /* not pushing a commit, which is not an error */
1301 continue;
1302
1303 /*
1304 * Is this tag, which they do not have, reachable from
1305 * any of the commits we are sending?
1306 */
1307 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1308 continue;
1309
1310 /* Add it in */
1311 dst_ref = make_linked_ref(ref->name, dst_tail);
1312 hashcpy(dst_ref->new_sha1, ref->new_sha1);
1313 dst_ref->peer_ref = copy_ref(ref);
1314 }
1315 }
1316 string_list_clear(&src_tag, 0);
1317 free(sent_tips.tip);
1318 }
1319
1320 /*
1321 * Given the set of refs the local repository has, the set of refs the
1322 * remote repository has, and the refspec used for push, determine
1323 * what remote refs we will update and with what value by setting
1324 * peer_ref (which object is being pushed) and force (if the push is
1325 * forced) in elements of "dst". The function may add new elements to
1326 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1327 */
1328 int match_push_refs(struct ref *src, struct ref **dst,
1329 int nr_refspec, const char **refspec, int flags)
1330 {
1331 struct refspec *rs;
1332 int send_all = flags & MATCH_REFS_ALL;
1333 int send_mirror = flags & MATCH_REFS_MIRROR;
1334 int send_prune = flags & MATCH_REFS_PRUNE;
1335 int errs;
1336 static const char *default_refspec[] = { ":", NULL };
1337 struct ref *ref, **dst_tail = tail_ref(dst);
1338
1339 if (!nr_refspec) {
1340 nr_refspec = 1;
1341 refspec = default_refspec;
1342 }
1343 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1344 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1345
1346 /* pick the remainder */
1347 for (ref = src; ref; ref = ref->next) {
1348 struct ref *dst_peer;
1349 const struct refspec *pat = NULL;
1350 char *dst_name;
1351
1352 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1353 if (!dst_name)
1354 continue;
1355
1356 dst_peer = find_ref_by_name(*dst, dst_name);
1357 if (dst_peer) {
1358 if (dst_peer->peer_ref)
1359 /* We're already sending something to this ref. */
1360 goto free_name;
1361 } else {
1362 if (pat->matching && !(send_all || send_mirror))
1363 /*
1364 * Remote doesn't have it, and we have no
1365 * explicit pattern, and we don't have
1366 * --all nor --mirror.
1367 */
1368 goto free_name;
1369
1370 /* Create a new one and link it */
1371 dst_peer = make_linked_ref(dst_name, &dst_tail);
1372 hashcpy(dst_peer->new_sha1, ref->new_sha1);
1373 }
1374 dst_peer->peer_ref = copy_ref(ref);
1375 dst_peer->force = pat->force;
1376 free_name:
1377 free(dst_name);
1378 }
1379
1380 if (flags & MATCH_REFS_FOLLOW_TAGS)
1381 add_missing_tags(src, dst, &dst_tail);
1382
1383 if (send_prune) {
1384 /* check for missing refs on the remote */
1385 for (ref = *dst; ref; ref = ref->next) {
1386 char *src_name;
1387
1388 if (ref->peer_ref)
1389 /* We're already sending something to this ref. */
1390 continue;
1391
1392 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1393 if (src_name) {
1394 if (!find_ref_by_name(src, src_name))
1395 ref->peer_ref = alloc_delete_ref();
1396 free(src_name);
1397 }
1398 }
1399 }
1400 if (errs)
1401 return -1;
1402 return 0;
1403 }
1404
1405 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1406 int force_update)
1407 {
1408 struct ref *ref;
1409
1410 for (ref = remote_refs; ref; ref = ref->next) {
1411 int force_ref_update = ref->force || force_update;
1412
1413 if (ref->peer_ref)
1414 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1415 else if (!send_mirror)
1416 continue;
1417
1418 ref->deletion = is_null_sha1(ref->new_sha1);
1419 if (!ref->deletion &&
1420 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1421 ref->status = REF_STATUS_UPTODATE;
1422 continue;
1423 }
1424
1425 /*
1426 * Decide whether an individual refspec A:B can be
1427 * pushed. The push will succeed if any of the
1428 * following are true:
1429 *
1430 * (1) the remote reference B does not exist
1431 *
1432 * (2) the remote reference B is being removed (i.e.,
1433 * pushing :B where no source is specified)
1434 *
1435 * (3) the destination is not under refs/tags/, and
1436 * if the old and new value is a commit, the new
1437 * is a descendant of the old.
1438 *
1439 * (4) it is forced using the +A:B notation, or by
1440 * passing the --force argument
1441 */
1442
1443 if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
1444 int why = 0; /* why would this push require --force? */
1445
1446 if (!prefixcmp(ref->name, "refs/tags/"))
1447 why = REF_STATUS_REJECT_ALREADY_EXISTS;
1448 else if (!has_sha1_file(ref->old_sha1))
1449 why = REF_STATUS_REJECT_FETCH_FIRST;
1450 else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1451 !lookup_commit_reference_gently(ref->new_sha1, 1))
1452 why = REF_STATUS_REJECT_NEEDS_FORCE;
1453 else if (!ref_newer(ref->new_sha1, ref->old_sha1))
1454 why = REF_STATUS_REJECT_NONFASTFORWARD;
1455
1456 if (!force_ref_update)
1457 ref->status = why;
1458 else if (why)
1459 ref->forced_update = 1;
1460 }
1461 }
1462 }
1463
1464 struct branch *branch_get(const char *name)
1465 {
1466 struct branch *ret;
1467
1468 read_config();
1469 if (!name || !*name || !strcmp(name, "HEAD"))
1470 ret = current_branch;
1471 else
1472 ret = make_branch(name, 0);
1473 if (ret && ret->remote_name) {
1474 ret->remote = remote_get(ret->remote_name);
1475 if (ret->merge_nr) {
1476 int i;
1477 ret->merge = xcalloc(sizeof(*ret->merge),
1478 ret->merge_nr);
1479 for (i = 0; i < ret->merge_nr; i++) {
1480 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1481 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1482 if (remote_find_tracking(ret->remote, ret->merge[i])
1483 && !strcmp(ret->remote_name, "."))
1484 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1485 }
1486 }
1487 }
1488 return ret;
1489 }
1490
1491 int branch_has_merge_config(struct branch *branch)
1492 {
1493 return branch && !!branch->merge;
1494 }
1495
1496 int branch_merge_matches(struct branch *branch,
1497 int i,
1498 const char *refname)
1499 {
1500 if (!branch || i < 0 || i >= branch->merge_nr)
1501 return 0;
1502 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1503 }
1504
1505 static int ignore_symref_update(const char *refname)
1506 {
1507 unsigned char sha1[20];
1508 int flag;
1509
1510 if (!resolve_ref_unsafe(refname, sha1, 0, &flag))
1511 return 0; /* non-existing refs are OK */
1512 return (flag & REF_ISSYMREF);
1513 }
1514
1515 static struct ref *get_expanded_map(const struct ref *remote_refs,
1516 const struct refspec *refspec)
1517 {
1518 const struct ref *ref;
1519 struct ref *ret = NULL;
1520 struct ref **tail = &ret;
1521
1522 char *expn_name;
1523
1524 for (ref = remote_refs; ref; ref = ref->next) {
1525 if (strchr(ref->name, '^'))
1526 continue; /* a dereference item */
1527 if (match_name_with_pattern(refspec->src, ref->name,
1528 refspec->dst, &expn_name) &&
1529 !ignore_symref_update(expn_name)) {
1530 struct ref *cpy = copy_ref(ref);
1531
1532 cpy->peer_ref = alloc_ref(expn_name);
1533 free(expn_name);
1534 if (refspec->force)
1535 cpy->peer_ref->force = 1;
1536 *tail = cpy;
1537 tail = &cpy->next;
1538 }
1539 }
1540
1541 return ret;
1542 }
1543
1544 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1545 {
1546 const struct ref *ref;
1547 for (ref = refs; ref; ref = ref->next) {
1548 if (refname_match(name, ref->name, ref_fetch_rules))
1549 return ref;
1550 }
1551 return NULL;
1552 }
1553
1554 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1555 {
1556 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1557
1558 if (!ref)
1559 return NULL;
1560
1561 return copy_ref(ref);
1562 }
1563
1564 static struct ref *get_local_ref(const char *name)
1565 {
1566 if (!name || name[0] == '\0')
1567 return NULL;
1568
1569 if (!prefixcmp(name, "refs/"))
1570 return alloc_ref(name);
1571
1572 if (!prefixcmp(name, "heads/") ||
1573 !prefixcmp(name, "tags/") ||
1574 !prefixcmp(name, "remotes/"))
1575 return alloc_ref_with_prefix("refs/", 5, name);
1576
1577 return alloc_ref_with_prefix("refs/heads/", 11, name);
1578 }
1579
1580 int get_fetch_map(const struct ref *remote_refs,
1581 const struct refspec *refspec,
1582 struct ref ***tail,
1583 int missing_ok)
1584 {
1585 struct ref *ref_map, **rmp;
1586
1587 if (refspec->pattern) {
1588 ref_map = get_expanded_map(remote_refs, refspec);
1589 } else {
1590 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1591
1592 if (refspec->exact_sha1) {
1593 ref_map = alloc_ref(name);
1594 get_sha1_hex(name, ref_map->old_sha1);
1595 } else {
1596 ref_map = get_remote_ref(remote_refs, name);
1597 }
1598 if (!missing_ok && !ref_map)
1599 die("Couldn't find remote ref %s", name);
1600 if (ref_map) {
1601 ref_map->peer_ref = get_local_ref(refspec->dst);
1602 if (ref_map->peer_ref && refspec->force)
1603 ref_map->peer_ref->force = 1;
1604 }
1605 }
1606
1607 for (rmp = &ref_map; *rmp; ) {
1608 if ((*rmp)->peer_ref) {
1609 if (prefixcmp((*rmp)->peer_ref->name, "refs/") ||
1610 check_refname_format((*rmp)->peer_ref->name, 0)) {
1611 struct ref *ignore = *rmp;
1612 error("* Ignoring funny ref '%s' locally",
1613 (*rmp)->peer_ref->name);
1614 *rmp = (*rmp)->next;
1615 free(ignore->peer_ref);
1616 free(ignore);
1617 continue;
1618 }
1619 }
1620 rmp = &((*rmp)->next);
1621 }
1622
1623 if (ref_map)
1624 tail_link_ref(ref_map, tail);
1625
1626 return 0;
1627 }
1628
1629 int resolve_remote_symref(struct ref *ref, struct ref *list)
1630 {
1631 if (!ref->symref)
1632 return 0;
1633 for (; list; list = list->next)
1634 if (!strcmp(ref->symref, list->name)) {
1635 hashcpy(ref->old_sha1, list->old_sha1);
1636 return 0;
1637 }
1638 return 1;
1639 }
1640
1641 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1642 {
1643 while (list) {
1644 struct commit_list *temp = list;
1645 temp->item->object.flags &= ~mark;
1646 list = temp->next;
1647 free(temp);
1648 }
1649 }
1650
1651 int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1652 {
1653 struct object *o;
1654 struct commit *old, *new;
1655 struct commit_list *list, *used;
1656 int found = 0;
1657
1658 /*
1659 * Both new and old must be commit-ish and new is descendant of
1660 * old. Otherwise we require --force.
1661 */
1662 o = deref_tag(parse_object(old_sha1), NULL, 0);
1663 if (!o || o->type != OBJ_COMMIT)
1664 return 0;
1665 old = (struct commit *) o;
1666
1667 o = deref_tag(parse_object(new_sha1), NULL, 0);
1668 if (!o || o->type != OBJ_COMMIT)
1669 return 0;
1670 new = (struct commit *) o;
1671
1672 if (parse_commit(new) < 0)
1673 return 0;
1674
1675 used = list = NULL;
1676 commit_list_insert(new, &list);
1677 while (list) {
1678 new = pop_most_recent_commit(&list, TMP_MARK);
1679 commit_list_insert(new, &used);
1680 if (new == old) {
1681 found = 1;
1682 break;
1683 }
1684 }
1685 unmark_and_free(list, TMP_MARK);
1686 unmark_and_free(used, TMP_MARK);
1687 return found;
1688 }
1689
1690 /*
1691 * Return true if there is anything to report, otherwise false.
1692 */
1693 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1694 {
1695 unsigned char sha1[20];
1696 struct commit *ours, *theirs;
1697 char symmetric[84];
1698 struct rev_info revs;
1699 const char *rev_argv[10], *base;
1700 int rev_argc;
1701
1702 /*
1703 * Nothing to report unless we are marked to build on top of
1704 * somebody else.
1705 */
1706 if (!branch ||
1707 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1708 return 0;
1709
1710 /*
1711 * If what we used to build on no longer exists, there is
1712 * nothing to report.
1713 */
1714 base = branch->merge[0]->dst;
1715 if (read_ref(base, sha1))
1716 return 0;
1717 theirs = lookup_commit_reference(sha1);
1718 if (!theirs)
1719 return 0;
1720
1721 if (read_ref(branch->refname, sha1))
1722 return 0;
1723 ours = lookup_commit_reference(sha1);
1724 if (!ours)
1725 return 0;
1726
1727 /* are we the same? */
1728 if (theirs == ours)
1729 return 0;
1730
1731 /* Run "rev-list --left-right ours...theirs" internally... */
1732 rev_argc = 0;
1733 rev_argv[rev_argc++] = NULL;
1734 rev_argv[rev_argc++] = "--left-right";
1735 rev_argv[rev_argc++] = symmetric;
1736 rev_argv[rev_argc++] = "--";
1737 rev_argv[rev_argc] = NULL;
1738
1739 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1740 strcpy(symmetric + 40, "...");
1741 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1742
1743 init_revisions(&revs, NULL);
1744 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1745 prepare_revision_walk(&revs);
1746
1747 /* ... and count the commits on each side. */
1748 *num_ours = 0;
1749 *num_theirs = 0;
1750 while (1) {
1751 struct commit *c = get_revision(&revs);
1752 if (!c)
1753 break;
1754 if (c->object.flags & SYMMETRIC_LEFT)
1755 (*num_ours)++;
1756 else
1757 (*num_theirs)++;
1758 }
1759
1760 /* clear object flags smudged by the above traversal */
1761 clear_commit_marks(ours, ALL_REV_FLAGS);
1762 clear_commit_marks(theirs, ALL_REV_FLAGS);
1763 return 1;
1764 }
1765
1766 /*
1767 * Return true when there is anything to report, otherwise false.
1768 */
1769 int format_tracking_info(struct branch *branch, struct strbuf *sb)
1770 {
1771 int num_ours, num_theirs;
1772 const char *base;
1773
1774 if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1775 return 0;
1776
1777 base = branch->merge[0]->dst;
1778 base = shorten_unambiguous_ref(base, 0);
1779 if (!num_theirs) {
1780 strbuf_addf(sb,
1781 Q_("Your branch is ahead of '%s' by %d commit.\n",
1782 "Your branch is ahead of '%s' by %d commits.\n",
1783 num_ours),
1784 base, num_ours);
1785 if (advice_status_hints)
1786 strbuf_addf(sb,
1787 _(" (use \"git push\" to publish your local commits)\n"));
1788 } else if (!num_ours) {
1789 strbuf_addf(sb,
1790 Q_("Your branch is behind '%s' by %d commit, "
1791 "and can be fast-forwarded.\n",
1792 "Your branch is behind '%s' by %d commits, "
1793 "and can be fast-forwarded.\n",
1794 num_theirs),
1795 base, num_theirs);
1796 if (advice_status_hints)
1797 strbuf_addf(sb,
1798 _(" (use \"git pull\" to update your local branch)\n"));
1799 } else {
1800 strbuf_addf(sb,
1801 Q_("Your branch and '%s' have diverged,\n"
1802 "and have %d and %d different commit each, "
1803 "respectively.\n",
1804 "Your branch and '%s' have diverged,\n"
1805 "and have %d and %d different commits each, "
1806 "respectively.\n",
1807 num_theirs),
1808 base, num_ours, num_theirs);
1809 if (advice_status_hints)
1810 strbuf_addf(sb,
1811 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
1812 }
1813 return 1;
1814 }
1815
1816 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1817 {
1818 struct ref ***local_tail = cb_data;
1819 struct ref *ref;
1820 int len;
1821
1822 /* we already know it starts with refs/ to get here */
1823 if (check_refname_format(refname + 5, 0))
1824 return 0;
1825
1826 len = strlen(refname) + 1;
1827 ref = xcalloc(1, sizeof(*ref) + len);
1828 hashcpy(ref->new_sha1, sha1);
1829 memcpy(ref->name, refname, len);
1830 **local_tail = ref;
1831 *local_tail = &ref->next;
1832 return 0;
1833 }
1834
1835 struct ref *get_local_heads(void)
1836 {
1837 struct ref *local_refs = NULL, **local_tail = &local_refs;
1838 for_each_ref(one_local_ref, &local_tail);
1839 return local_refs;
1840 }
1841
1842 struct ref *guess_remote_head(const struct ref *head,
1843 const struct ref *refs,
1844 int all)
1845 {
1846 const struct ref *r;
1847 struct ref *list = NULL;
1848 struct ref **tail = &list;
1849
1850 if (!head)
1851 return NULL;
1852
1853 /*
1854 * Some transports support directly peeking at
1855 * where HEAD points; if that is the case, then
1856 * we don't have to guess.
1857 */
1858 if (head->symref)
1859 return copy_ref(find_ref_by_name(refs, head->symref));
1860
1861 /* If refs/heads/master could be right, it is. */
1862 if (!all) {
1863 r = find_ref_by_name(refs, "refs/heads/master");
1864 if (r && !hashcmp(r->old_sha1, head->old_sha1))
1865 return copy_ref(r);
1866 }
1867
1868 /* Look for another ref that points there */
1869 for (r = refs; r; r = r->next) {
1870 if (r != head &&
1871 !prefixcmp(r->name, "refs/heads/") &&
1872 !hashcmp(r->old_sha1, head->old_sha1)) {
1873 *tail = copy_ref(r);
1874 tail = &((*tail)->next);
1875 if (!all)
1876 break;
1877 }
1878 }
1879
1880 return list;
1881 }
1882
1883 struct stale_heads_info {
1884 struct string_list *ref_names;
1885 struct ref **stale_refs_tail;
1886 struct refspec *refs;
1887 int ref_count;
1888 };
1889
1890 static int get_stale_heads_cb(const char *refname,
1891 const unsigned char *sha1, int flags, void *cb_data)
1892 {
1893 struct stale_heads_info *info = cb_data;
1894 struct refspec query;
1895 memset(&query, 0, sizeof(struct refspec));
1896 query.dst = (char *)refname;
1897
1898 if (query_refspecs(info->refs, info->ref_count, &query))
1899 return 0; /* No matches */
1900
1901 /*
1902 * If we did find a suitable refspec and it's not a symref and
1903 * it's not in the list of refs that currently exist in that
1904 * remote we consider it to be stale.
1905 */
1906 if (!((flags & REF_ISSYMREF) ||
1907 string_list_has_string(info->ref_names, query.src))) {
1908 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
1909 hashcpy(ref->new_sha1, sha1);
1910 }
1911
1912 free(query.src);
1913 return 0;
1914 }
1915
1916 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
1917 {
1918 struct ref *ref, *stale_refs = NULL;
1919 struct string_list ref_names = STRING_LIST_INIT_NODUP;
1920 struct stale_heads_info info;
1921 info.ref_names = &ref_names;
1922 info.stale_refs_tail = &stale_refs;
1923 info.refs = refs;
1924 info.ref_count = ref_count;
1925 for (ref = fetch_map; ref; ref = ref->next)
1926 string_list_append(&ref_names, ref->name);
1927 sort_string_list(&ref_names);
1928 for_each_ref(get_stale_heads_cb, &info);
1929 string_list_clear(&ref_names, 0);
1930 return stale_refs;
1931 }
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