string_list: Fix argument order for string_list_insert
[git/git.git] / remote.c
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
11 static struct refspec s_tag_refspec = {
12 0,
13 1,
14 0,
15 "refs/tags/*",
16 "refs/tags/*"
17 };
18
19 const struct refspec *tag_refspec = &s_tag_refspec;
20
21 struct counted_string {
22 size_t len;
23 const char *s;
24 };
25 struct rewrite {
26 const char *base;
27 size_t baselen;
28 struct counted_string *instead_of;
29 int instead_of_nr;
30 int instead_of_alloc;
31 };
32 struct rewrites {
33 struct rewrite **rewrite;
34 int rewrite_alloc;
35 int rewrite_nr;
36 };
37
38 static struct remote **remotes;
39 static int remotes_alloc;
40 static int remotes_nr;
41
42 static struct branch **branches;
43 static int branches_alloc;
44 static int branches_nr;
45
46 static struct branch *current_branch;
47 static const char *default_remote_name;
48 static int explicit_default_remote_name;
49
50 static struct rewrites rewrites;
51 static struct rewrites rewrites_push;
52
53 #define BUF_SIZE (2048)
54 static char buffer[BUF_SIZE];
55
56 static int valid_remote(const struct remote *remote)
57 {
58 return (!!remote->url) || (!!remote->foreign_vcs);
59 }
60
61 static const char *alias_url(const char *url, struct rewrites *r)
62 {
63 int i, j;
64 char *ret;
65 struct counted_string *longest;
66 int longest_i;
67
68 longest = NULL;
69 longest_i = -1;
70 for (i = 0; i < r->rewrite_nr; i++) {
71 if (!r->rewrite[i])
72 continue;
73 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
74 if (!prefixcmp(url, r->rewrite[i]->instead_of[j].s) &&
75 (!longest ||
76 longest->len < r->rewrite[i]->instead_of[j].len)) {
77 longest = &(r->rewrite[i]->instead_of[j]);
78 longest_i = i;
79 }
80 }
81 }
82 if (!longest)
83 return url;
84
85 ret = xmalloc(r->rewrite[longest_i]->baselen +
86 (strlen(url) - longest->len) + 1);
87 strcpy(ret, r->rewrite[longest_i]->base);
88 strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
89 return ret;
90 }
91
92 static void add_push_refspec(struct remote *remote, const char *ref)
93 {
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;
98 }
99
100 static void add_fetch_refspec(struct remote *remote, const char *ref)
101 {
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;
106 }
107
108 static void add_url(struct remote *remote, const char *url)
109 {
110 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
111 remote->url[remote->url_nr++] = url;
112 }
113
114 static 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
120 static 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
127 static 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
133 static struct remote *make_remote(const char *name, int len)
134 {
135 struct remote *ret;
136 int i;
137
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];
143 }
144
145 ret = xcalloc(1, sizeof(struct remote));
146 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
147 remotes[remotes_nr++] = ret;
148 if (len)
149 ret->name = xstrndup(name, len);
150 else
151 ret->name = xstrdup(name);
152 return ret;
153 }
154
155 static void add_merge(struct branch *branch, const char *name)
156 {
157 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
158 branch->merge_alloc);
159 branch->merge_name[branch->merge_nr++] = name;
160 }
161
162 static struct branch *make_branch(const char *name, int len)
163 {
164 struct branch *ret;
165 int i;
166 char *refname;
167
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];
173 }
174
175 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
176 ret = xcalloc(1, sizeof(struct branch));
177 branches[branches_nr++] = ret;
178 if (len)
179 ret->name = xstrndup(name, len);
180 else
181 ret->name = xstrdup(name);
182 refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
183 strcpy(refname, "refs/heads/");
184 strcpy(refname + strlen("refs/heads/"), ret->name);
185 ret->refname = refname;
186
187 return ret;
188 }
189
190 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
191 {
192 struct rewrite *ret;
193 int i;
194
195 for (i = 0; i < r->rewrite_nr; i++) {
196 if (len
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];
201 }
202
203 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
204 ret = xcalloc(1, sizeof(struct rewrite));
205 r->rewrite[r->rewrite_nr++] = ret;
206 if (len) {
207 ret->base = xstrndup(base, len);
208 ret->baselen = len;
209 }
210 else {
211 ret->base = xstrdup(base);
212 ret->baselen = strlen(base);
213 }
214 return ret;
215 }
216
217 static 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);
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++;
223 }
224
225 static 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;
231 remote->origin = REMOTE_REMOTES;
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;
242 } else if (!prefixcmp(buffer, "Pull:")) {
243 value_list = 2;
244 s = buffer + 5;
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:
259 add_url_alias(remote, xstrdup(s));
260 break;
261 case 1:
262 add_push_refspec(remote, xstrdup(s));
263 break;
264 case 2:
265 add_fetch_refspec(remote, xstrdup(s));
266 break;
267 }
268 }
269 fclose(f);
270 }
271
272 static void read_branches_file(struct remote *remote)
273 {
274 const char *slash = strchr(remote->name, '/');
275 char *frag;
276 struct strbuf branch = STRBUF_INIT;
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;
292 remote->origin = REMOTE_BRANCHES;
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);
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 */
315 frag = strchr(p, '#');
316 if (frag) {
317 *(frag++) = '\0';
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);
323 } else {
324 strbuf_reset(&branch);
325 strbuf_addstr(&branch, "HEAD:");
326 }
327 add_url_alias(remote, p);
328 add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
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");
339 add_push_refspec(remote, strbuf_detach(&branch, NULL));
340 remote->fetch_tags = 1; /* always auto-follow */
341 }
342
343 static int handle_config(const char *key, const char *value, void *cb)
344 {
345 const char *name;
346 const char *subkey;
347 struct remote *remote;
348 struct branch *branch;
349 if (!prefixcmp(key, "branch.")) {
350 name = key + 7;
351 subkey = strrchr(name, '.');
352 if (!subkey)
353 return 0;
354 branch = make_branch(name, subkey - name);
355 if (!strcmp(subkey, ".remote")) {
356 if (!value)
357 return config_error_nonbool(key);
358 branch->remote_name = xstrdup(value);
359 if (branch == current_branch) {
360 default_remote_name = branch->remote_name;
361 explicit_default_remote_name = 1;
362 }
363 } else if (!strcmp(subkey, ".merge")) {
364 if (!value)
365 return config_error_nonbool(key);
366 add_merge(branch, xstrdup(value));
367 }
368 return 0;
369 }
370 if (!prefixcmp(key, "url.")) {
371 struct rewrite *rewrite;
372 name = key + 4;
373 subkey = strrchr(name, '.');
374 if (!subkey)
375 return 0;
376 if (!strcmp(subkey, ".insteadof")) {
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);
383 if (!value)
384 return config_error_nonbool(key);
385 add_instead_of(rewrite, xstrdup(value));
386 }
387 }
388 if (prefixcmp(key, "remote."))
389 return 0;
390 name = key + 7;
391 if (*name == '/') {
392 warning("Config remote shorthand cannot begin with '/': %s",
393 name);
394 return 0;
395 }
396 subkey = strrchr(name, '.');
397 if (!subkey)
398 return 0;
399 remote = make_remote(name, subkey - name);
400 remote->origin = REMOTE_CONFIG;
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);
405 else if (!strcmp(subkey, ".skipfetchall"))
406 remote->skip_default_update = git_config_bool(key, value);
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);
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);
417 } else if (!strcmp(subkey, ".push")) {
418 const char *v;
419 if (git_config_string(&v, key, value))
420 return -1;
421 add_push_refspec(remote, v);
422 } else if (!strcmp(subkey, ".fetch")) {
423 const char *v;
424 if (git_config_string(&v, key, value))
425 return -1;
426 add_fetch_refspec(remote, v);
427 } else if (!strcmp(subkey, ".receivepack")) {
428 const char *v;
429 if (git_config_string(&v, key, value))
430 return -1;
431 if (!remote->receivepack)
432 remote->receivepack = v;
433 else
434 error("more than one receivepack given, using the first");
435 } else if (!strcmp(subkey, ".uploadpack")) {
436 const char *v;
437 if (git_config_string(&v, key, value))
438 return -1;
439 if (!remote->uploadpack)
440 remote->uploadpack = v;
441 else
442 error("more than one uploadpack given, using the first");
443 } else if (!strcmp(subkey, ".tagopt")) {
444 if (!strcmp(value, "--no-tags"))
445 remote->fetch_tags = -1;
446 else if (!strcmp(value, "--tags"))
447 remote->fetch_tags = 2;
448 } else if (!strcmp(subkey, ".proxy")) {
449 return git_config_string((const char **)&remote->http_proxy,
450 key, value);
451 } else if (!strcmp(subkey, ".vcs")) {
452 return git_config_string(&remote->foreign_vcs, key, value);
453 }
454 return 0;
455 }
456
457 static void alias_all_urls(void)
458 {
459 int i, j;
460 for (i = 0; i < remotes_nr; i++) {
461 int add_pushurl_aliases;
462 if (!remotes[i])
463 continue;
464 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
465 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
466 }
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 }
473 }
474 }
475
476 static void read_config(void)
477 {
478 unsigned char sha1[20];
479 const char *head_ref;
480 int flag;
481 if (default_remote_name) // did this already
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/")) {
488 current_branch =
489 make_branch(head_ref + strlen("refs/heads/"), 0);
490 }
491 git_config(handle_config, NULL);
492 alias_all_urls();
493 }
494
495 /*
496 * We need to make sure the tracking branches are well formed, but a
497 * wildcard refspec in "struct refspec" must have a trailing slash. We
498 * temporarily drop the trailing '/' while calling check_ref_format(),
499 * and put it back. The caller knows that a CHECK_REF_FORMAT_ONELEVEL
500 * error return is Ok for a wildcard refspec.
501 */
502 static int verify_refname(char *name, int is_glob)
503 {
504 int result;
505
506 result = check_ref_format(name);
507 if (is_glob && result == CHECK_REF_FORMAT_WILDCARD)
508 result = CHECK_REF_FORMAT_OK;
509 return result;
510 }
511
512 /*
513 * This function frees a refspec array.
514 * Warning: code paths should be checked to ensure that the src
515 * and dst pointers are always freeable pointers as well
516 * as the refspec pointer itself.
517 */
518 static void free_refspecs(struct refspec *refspec, int nr_refspec)
519 {
520 int i;
521
522 if (!refspec)
523 return;
524
525 for (i = 0; i < nr_refspec; i++) {
526 free(refspec[i].src);
527 free(refspec[i].dst);
528 }
529 free(refspec);
530 }
531
532 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
533 {
534 int i;
535 int st;
536 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
537
538 for (i = 0; i < nr_refspec; i++) {
539 size_t llen;
540 int is_glob;
541 const char *lhs, *rhs;
542
543 is_glob = 0;
544
545 lhs = refspec[i];
546 if (*lhs == '+') {
547 rs[i].force = 1;
548 lhs++;
549 }
550
551 rhs = strrchr(lhs, ':');
552
553 /*
554 * Before going on, special case ":" (or "+:") as a refspec
555 * for matching refs.
556 */
557 if (!fetch && rhs == lhs && rhs[1] == '\0') {
558 rs[i].matching = 1;
559 continue;
560 }
561
562 if (rhs) {
563 size_t rlen = strlen(++rhs);
564 is_glob = (1 <= rlen && strchr(rhs, '*'));
565 rs[i].dst = xstrndup(rhs, rlen);
566 }
567
568 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
569 if (1 <= llen && memchr(lhs, '*', llen)) {
570 if ((rhs && !is_glob) || (!rhs && fetch))
571 goto invalid;
572 is_glob = 1;
573 } else if (rhs && is_glob) {
574 goto invalid;
575 }
576
577 rs[i].pattern = is_glob;
578 rs[i].src = xstrndup(lhs, llen);
579
580 if (fetch) {
581 /*
582 * LHS
583 * - empty is allowed; it means HEAD.
584 * - otherwise it must be a valid looking ref.
585 */
586 if (!*rs[i].src)
587 ; /* empty is ok */
588 else {
589 st = verify_refname(rs[i].src, is_glob);
590 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
591 goto invalid;
592 }
593 /*
594 * RHS
595 * - missing is ok, and is same as empty.
596 * - empty is ok; it means not to store.
597 * - otherwise it must be a valid looking ref.
598 */
599 if (!rs[i].dst) {
600 ; /* ok */
601 } else if (!*rs[i].dst) {
602 ; /* ok */
603 } else {
604 st = verify_refname(rs[i].dst, is_glob);
605 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
606 goto invalid;
607 }
608 } else {
609 /*
610 * LHS
611 * - empty is allowed; it means delete.
612 * - when wildcarded, it must be a valid looking ref.
613 * - otherwise, it must be an extended SHA-1, but
614 * there is no existing way to validate this.
615 */
616 if (!*rs[i].src)
617 ; /* empty is ok */
618 else if (is_glob) {
619 st = verify_refname(rs[i].src, is_glob);
620 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
621 goto invalid;
622 }
623 else
624 ; /* anything goes, for now */
625 /*
626 * RHS
627 * - missing is allowed, but LHS then must be a
628 * valid looking ref.
629 * - empty is not allowed.
630 * - otherwise it must be a valid looking ref.
631 */
632 if (!rs[i].dst) {
633 st = verify_refname(rs[i].src, is_glob);
634 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
635 goto invalid;
636 } else if (!*rs[i].dst) {
637 goto invalid;
638 } else {
639 st = verify_refname(rs[i].dst, is_glob);
640 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
641 goto invalid;
642 }
643 }
644 }
645 return rs;
646
647 invalid:
648 if (verify) {
649 /*
650 * nr_refspec must be greater than zero and i must be valid
651 * since it is only possible to reach this point from within
652 * the for loop above.
653 */
654 free_refspecs(rs, i+1);
655 return NULL;
656 }
657 die("Invalid refspec '%s'", refspec[i]);
658 }
659
660 int valid_fetch_refspec(const char *fetch_refspec_str)
661 {
662 const char *fetch_refspec[] = { fetch_refspec_str };
663 struct refspec *refspec;
664
665 refspec = parse_refspec_internal(1, fetch_refspec, 1, 1);
666 free_refspecs(refspec, 1);
667 return !!refspec;
668 }
669
670 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
671 {
672 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
673 }
674
675 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
676 {
677 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
678 }
679
680 void free_refspec(int nr_refspec, struct refspec *refspec)
681 {
682 int i;
683 for (i = 0; i < nr_refspec; i++) {
684 free(refspec[i].src);
685 free(refspec[i].dst);
686 }
687 free(refspec);
688 }
689
690 static int valid_remote_nick(const char *name)
691 {
692 if (!name[0] || is_dot_or_dotdot(name))
693 return 0;
694 return !strchr(name, '/'); /* no slash */
695 }
696
697 struct remote *remote_get(const char *name)
698 {
699 struct remote *ret;
700 int name_given = 0;
701
702 read_config();
703 if (name)
704 name_given = 1;
705 else {
706 name = default_remote_name;
707 name_given = explicit_default_remote_name;
708 }
709
710 ret = make_remote(name, 0);
711 if (valid_remote_nick(name)) {
712 if (!valid_remote(ret))
713 read_remotes_file(ret);
714 if (!valid_remote(ret))
715 read_branches_file(ret);
716 }
717 if (name_given && !valid_remote(ret))
718 add_url_alias(ret, name);
719 if (!valid_remote(ret))
720 return NULL;
721 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
722 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
723 return ret;
724 }
725
726 int remote_is_configured(const char *name)
727 {
728 int i;
729 read_config();
730
731 for (i = 0; i < remotes_nr; i++)
732 if (!strcmp(name, remotes[i]->name))
733 return 1;
734 return 0;
735 }
736
737 int for_each_remote(each_remote_fn fn, void *priv)
738 {
739 int i, result = 0;
740 read_config();
741 for (i = 0; i < remotes_nr && !result; i++) {
742 struct remote *r = remotes[i];
743 if (!r)
744 continue;
745 if (!r->fetch)
746 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
747 r->fetch_refspec);
748 if (!r->push)
749 r->push = parse_push_refspec(r->push_refspec_nr,
750 r->push_refspec);
751 result = fn(r, priv);
752 }
753 return result;
754 }
755
756 void ref_remove_duplicates(struct ref *ref_map)
757 {
758 struct string_list refs = { NULL, 0, 0, 0 };
759 struct string_list_item *item = NULL;
760 struct ref *prev = NULL, *next = NULL;
761 for (; ref_map; prev = ref_map, ref_map = next) {
762 next = ref_map->next;
763 if (!ref_map->peer_ref)
764 continue;
765
766 item = string_list_lookup(ref_map->peer_ref->name, &refs);
767 if (item) {
768 if (strcmp(((struct ref *)item->util)->name,
769 ref_map->name))
770 die("%s tracks both %s and %s",
771 ref_map->peer_ref->name,
772 ((struct ref *)item->util)->name,
773 ref_map->name);
774 prev->next = ref_map->next;
775 free(ref_map->peer_ref);
776 free(ref_map);
777 ref_map = prev; /* skip this; we freed it */
778 continue;
779 }
780
781 item = string_list_insert(&refs, ref_map->peer_ref->name);
782 item->util = ref_map;
783 }
784 string_list_clear(&refs, 0);
785 }
786
787 int remote_has_url(struct remote *remote, const char *url)
788 {
789 int i;
790 for (i = 0; i < remote->url_nr; i++) {
791 if (!strcmp(remote->url[i], url))
792 return 1;
793 }
794 return 0;
795 }
796
797 static int match_name_with_pattern(const char *key, const char *name,
798 const char *value, char **result)
799 {
800 const char *kstar = strchr(key, '*');
801 size_t klen;
802 size_t ksuffixlen;
803 size_t namelen;
804 int ret;
805 if (!kstar)
806 die("Key '%s' of pattern had no '*'", key);
807 klen = kstar - key;
808 ksuffixlen = strlen(kstar + 1);
809 namelen = strlen(name);
810 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
811 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
812 if (ret && value) {
813 const char *vstar = strchr(value, '*');
814 size_t vlen;
815 size_t vsuffixlen;
816 if (!vstar)
817 die("Value '%s' of pattern has no '*'", value);
818 vlen = vstar - value;
819 vsuffixlen = strlen(vstar + 1);
820 *result = xmalloc(vlen + vsuffixlen +
821 strlen(name) -
822 klen - ksuffixlen + 1);
823 strncpy(*result, value, vlen);
824 strncpy(*result + vlen,
825 name + klen, namelen - klen - ksuffixlen);
826 strcpy(*result + vlen + namelen - klen - ksuffixlen,
827 vstar + 1);
828 }
829 return ret;
830 }
831
832 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
833 const char *name)
834 {
835 int i;
836 char *ret = NULL;
837 for (i = 0; i < nr_refspec; i++) {
838 struct refspec *refspec = refspecs + i;
839 if (refspec->pattern) {
840 if (match_name_with_pattern(refspec->src, name,
841 refspec->dst, &ret))
842 return ret;
843 } else if (!strcmp(refspec->src, name))
844 return strdup(refspec->dst);
845 }
846 return NULL;
847 }
848
849 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
850 {
851 int find_src = refspec->src == NULL;
852 char *needle, **result;
853 int i;
854
855 if (find_src) {
856 if (!refspec->dst)
857 return error("find_tracking: need either src or dst");
858 needle = refspec->dst;
859 result = &refspec->src;
860 } else {
861 needle = refspec->src;
862 result = &refspec->dst;
863 }
864
865 for (i = 0; i < remote->fetch_refspec_nr; i++) {
866 struct refspec *fetch = &remote->fetch[i];
867 const char *key = find_src ? fetch->dst : fetch->src;
868 const char *value = find_src ? fetch->src : fetch->dst;
869 if (!fetch->dst)
870 continue;
871 if (fetch->pattern) {
872 if (match_name_with_pattern(key, needle, value, result)) {
873 refspec->force = fetch->force;
874 return 0;
875 }
876 } else if (!strcmp(needle, key)) {
877 *result = xstrdup(value);
878 refspec->force = fetch->force;
879 return 0;
880 }
881 }
882 return -1;
883 }
884
885 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
886 const char *name)
887 {
888 size_t len = strlen(name);
889 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
890 memcpy(ref->name, prefix, prefixlen);
891 memcpy(ref->name + prefixlen, name, len);
892 return ref;
893 }
894
895 struct ref *alloc_ref(const char *name)
896 {
897 return alloc_ref_with_prefix("", 0, name);
898 }
899
900 static struct ref *copy_ref(const struct ref *ref)
901 {
902 struct ref *cpy;
903 size_t len;
904 if (!ref)
905 return NULL;
906 len = strlen(ref->name);
907 cpy = xmalloc(sizeof(struct ref) + len + 1);
908 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
909 cpy->next = NULL;
910 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
911 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
912 cpy->peer_ref = copy_ref(ref->peer_ref);
913 return cpy;
914 }
915
916 struct ref *copy_ref_list(const struct ref *ref)
917 {
918 struct ref *ret = NULL;
919 struct ref **tail = &ret;
920 while (ref) {
921 *tail = copy_ref(ref);
922 ref = ref->next;
923 tail = &((*tail)->next);
924 }
925 return ret;
926 }
927
928 static void free_ref(struct ref *ref)
929 {
930 if (!ref)
931 return;
932 free_ref(ref->peer_ref);
933 free(ref->remote_status);
934 free(ref->symref);
935 free(ref);
936 }
937
938 void free_refs(struct ref *ref)
939 {
940 struct ref *next;
941 while (ref) {
942 next = ref->next;
943 free_ref(ref);
944 ref = next;
945 }
946 }
947
948 static int count_refspec_match(const char *pattern,
949 struct ref *refs,
950 struct ref **matched_ref)
951 {
952 int patlen = strlen(pattern);
953 struct ref *matched_weak = NULL;
954 struct ref *matched = NULL;
955 int weak_match = 0;
956 int match = 0;
957
958 for (weak_match = match = 0; refs; refs = refs->next) {
959 char *name = refs->name;
960 int namelen = strlen(name);
961
962 if (!refname_match(pattern, name, ref_rev_parse_rules))
963 continue;
964
965 /* A match is "weak" if it is with refs outside
966 * heads or tags, and did not specify the pattern
967 * in full (e.g. "refs/remotes/origin/master") or at
968 * least from the toplevel (e.g. "remotes/origin/master");
969 * otherwise "git push $URL master" would result in
970 * ambiguity between remotes/origin/master and heads/master
971 * at the remote site.
972 */
973 if (namelen != patlen &&
974 patlen != namelen - 5 &&
975 prefixcmp(name, "refs/heads/") &&
976 prefixcmp(name, "refs/tags/")) {
977 /* We want to catch the case where only weak
978 * matches are found and there are multiple
979 * matches, and where more than one strong
980 * matches are found, as ambiguous. One
981 * strong match with zero or more weak matches
982 * are acceptable as a unique match.
983 */
984 matched_weak = refs;
985 weak_match++;
986 }
987 else {
988 matched = refs;
989 match++;
990 }
991 }
992 if (!matched) {
993 *matched_ref = matched_weak;
994 return weak_match;
995 }
996 else {
997 *matched_ref = matched;
998 return match;
999 }
1000 }
1001
1002 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1003 {
1004 **tail = ref;
1005 while (ref->next)
1006 ref = ref->next;
1007 *tail = &ref->next;
1008 }
1009
1010 static struct ref *try_explicit_object_name(const char *name)
1011 {
1012 unsigned char sha1[20];
1013 struct ref *ref;
1014
1015 if (!*name) {
1016 ref = alloc_ref("(delete)");
1017 hashclr(ref->new_sha1);
1018 return ref;
1019 }
1020 if (get_sha1(name, sha1))
1021 return NULL;
1022 ref = alloc_ref(name);
1023 hashcpy(ref->new_sha1, sha1);
1024 return ref;
1025 }
1026
1027 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1028 {
1029 struct ref *ret = alloc_ref(name);
1030 tail_link_ref(ret, tail);
1031 return ret;
1032 }
1033
1034 static char *guess_ref(const char *name, struct ref *peer)
1035 {
1036 struct strbuf buf = STRBUF_INIT;
1037 unsigned char sha1[20];
1038
1039 const char *r = resolve_ref(peer->name, sha1, 1, NULL);
1040 if (!r)
1041 return NULL;
1042
1043 if (!prefixcmp(r, "refs/heads/"))
1044 strbuf_addstr(&buf, "refs/heads/");
1045 else if (!prefixcmp(r, "refs/tags/"))
1046 strbuf_addstr(&buf, "refs/tags/");
1047 else
1048 return NULL;
1049
1050 strbuf_addstr(&buf, name);
1051 return strbuf_detach(&buf, NULL);
1052 }
1053
1054 static int match_explicit(struct ref *src, struct ref *dst,
1055 struct ref ***dst_tail,
1056 struct refspec *rs)
1057 {
1058 struct ref *matched_src, *matched_dst;
1059 int copy_src;
1060
1061 const char *dst_value = rs->dst;
1062 char *dst_guess;
1063
1064 if (rs->pattern || rs->matching)
1065 return 0;
1066
1067 matched_src = matched_dst = NULL;
1068 switch (count_refspec_match(rs->src, src, &matched_src)) {
1069 case 1:
1070 copy_src = 1;
1071 break;
1072 case 0:
1073 /* The source could be in the get_sha1() format
1074 * not a reference name. :refs/other is a
1075 * way to delete 'other' ref at the remote end.
1076 */
1077 matched_src = try_explicit_object_name(rs->src);
1078 if (!matched_src)
1079 return error("src refspec %s does not match any.", rs->src);
1080 copy_src = 0;
1081 break;
1082 default:
1083 return error("src refspec %s matches more than one.", rs->src);
1084 }
1085
1086 if (!dst_value) {
1087 unsigned char sha1[20];
1088 int flag;
1089
1090 dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
1091 if (!dst_value ||
1092 ((flag & REF_ISSYMREF) &&
1093 prefixcmp(dst_value, "refs/heads/")))
1094 die("%s cannot be resolved to branch.",
1095 matched_src->name);
1096 }
1097
1098 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1099 case 1:
1100 break;
1101 case 0:
1102 if (!memcmp(dst_value, "refs/", 5))
1103 matched_dst = make_linked_ref(dst_value, dst_tail);
1104 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1105 matched_dst = make_linked_ref(dst_guess, dst_tail);
1106 else
1107 error("unable to push to unqualified destination: %s\n"
1108 "The destination refspec neither matches an "
1109 "existing ref on the remote nor\n"
1110 "begins with refs/, and we are unable to "
1111 "guess a prefix based on the source ref.",
1112 dst_value);
1113 break;
1114 default:
1115 matched_dst = NULL;
1116 error("dst refspec %s matches more than one.",
1117 dst_value);
1118 break;
1119 }
1120 if (!matched_dst)
1121 return -1;
1122 if (matched_dst->peer_ref)
1123 return error("dst ref %s receives from more than one src.",
1124 matched_dst->name);
1125 else {
1126 matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1127 matched_dst->force = rs->force;
1128 }
1129 return 0;
1130 }
1131
1132 static int match_explicit_refs(struct ref *src, struct ref *dst,
1133 struct ref ***dst_tail, struct refspec *rs,
1134 int rs_nr)
1135 {
1136 int i, errs;
1137 for (i = errs = 0; i < rs_nr; i++)
1138 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1139 return errs;
1140 }
1141
1142 static const struct refspec *check_pattern_match(const struct refspec *rs,
1143 int rs_nr,
1144 const struct ref *src)
1145 {
1146 int i;
1147 int matching_refs = -1;
1148 for (i = 0; i < rs_nr; i++) {
1149 if (rs[i].matching &&
1150 (matching_refs == -1 || rs[i].force)) {
1151 matching_refs = i;
1152 continue;
1153 }
1154
1155 if (rs[i].pattern && match_name_with_pattern(rs[i].src, src->name,
1156 NULL, NULL))
1157 return rs + i;
1158 }
1159 if (matching_refs != -1)
1160 return rs + matching_refs;
1161 else
1162 return NULL;
1163 }
1164
1165 static struct ref **tail_ref(struct ref **head)
1166 {
1167 struct ref **tail = head;
1168 while (*tail)
1169 tail = &((*tail)->next);
1170 return tail;
1171 }
1172
1173 /*
1174 * Note. This is used only by "push"; refspec matching rules for
1175 * push and fetch are subtly different, so do not try to reuse it
1176 * without thinking.
1177 */
1178 int match_refs(struct ref *src, struct ref **dst,
1179 int nr_refspec, const char **refspec, int flags)
1180 {
1181 struct refspec *rs;
1182 int send_all = flags & MATCH_REFS_ALL;
1183 int send_mirror = flags & MATCH_REFS_MIRROR;
1184 int errs;
1185 static const char *default_refspec[] = { ":", NULL };
1186 struct ref **dst_tail = tail_ref(dst);
1187
1188 if (!nr_refspec) {
1189 nr_refspec = 1;
1190 refspec = default_refspec;
1191 }
1192 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1193 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1194
1195 /* pick the remainder */
1196 for ( ; src; src = src->next) {
1197 struct ref *dst_peer;
1198 const struct refspec *pat = NULL;
1199 char *dst_name;
1200 if (src->peer_ref)
1201 continue;
1202
1203 pat = check_pattern_match(rs, nr_refspec, src);
1204 if (!pat)
1205 continue;
1206
1207 if (pat->matching) {
1208 /*
1209 * "matching refs"; traditionally we pushed everything
1210 * including refs outside refs/heads/ hierarchy, but
1211 * that does not make much sense these days.
1212 */
1213 if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
1214 continue;
1215 dst_name = xstrdup(src->name);
1216
1217 } else {
1218 const char *dst_side = pat->dst ? pat->dst : pat->src;
1219 if (!match_name_with_pattern(pat->src, src->name,
1220 dst_side, &dst_name))
1221 die("Didn't think it matches any more");
1222 }
1223 dst_peer = find_ref_by_name(*dst, dst_name);
1224 if (dst_peer) {
1225 if (dst_peer->peer_ref)
1226 /* We're already sending something to this ref. */
1227 goto free_name;
1228
1229 } else {
1230 if (pat->matching && !(send_all || send_mirror))
1231 /*
1232 * Remote doesn't have it, and we have no
1233 * explicit pattern, and we don't have
1234 * --all nor --mirror.
1235 */
1236 goto free_name;
1237
1238 /* Create a new one and link it */
1239 dst_peer = make_linked_ref(dst_name, &dst_tail);
1240 hashcpy(dst_peer->new_sha1, src->new_sha1);
1241 }
1242 dst_peer->peer_ref = copy_ref(src);
1243 dst_peer->force = pat->force;
1244 free_name:
1245 free(dst_name);
1246 }
1247 if (errs)
1248 return -1;
1249 return 0;
1250 }
1251
1252 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1253 int force_update)
1254 {
1255 struct ref *ref;
1256
1257 for (ref = remote_refs; ref; ref = ref->next) {
1258 if (ref->peer_ref)
1259 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1260 else if (!send_mirror)
1261 continue;
1262
1263 ref->deletion = is_null_sha1(ref->new_sha1);
1264 if (!ref->deletion &&
1265 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1266 ref->status = REF_STATUS_UPTODATE;
1267 continue;
1268 }
1269
1270 /* This part determines what can overwrite what.
1271 * The rules are:
1272 *
1273 * (0) you can always use --force or +A:B notation to
1274 * selectively force individual ref pairs.
1275 *
1276 * (1) if the old thing does not exist, it is OK.
1277 *
1278 * (2) if you do not have the old thing, you are not allowed
1279 * to overwrite it; you would not know what you are losing
1280 * otherwise.
1281 *
1282 * (3) if both new and old are commit-ish, and new is a
1283 * descendant of old, it is OK.
1284 *
1285 * (4) regardless of all of the above, removing :B is
1286 * always allowed.
1287 */
1288
1289 ref->nonfastforward =
1290 !ref->deletion &&
1291 !is_null_sha1(ref->old_sha1) &&
1292 (!has_sha1_file(ref->old_sha1)
1293 || !ref_newer(ref->new_sha1, ref->old_sha1));
1294
1295 if (ref->nonfastforward && !ref->force && !force_update) {
1296 ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
1297 continue;
1298 }
1299 }
1300 }
1301
1302 struct branch *branch_get(const char *name)
1303 {
1304 struct branch *ret;
1305
1306 read_config();
1307 if (!name || !*name || !strcmp(name, "HEAD"))
1308 ret = current_branch;
1309 else
1310 ret = make_branch(name, 0);
1311 if (ret && ret->remote_name) {
1312 ret->remote = remote_get(ret->remote_name);
1313 if (ret->merge_nr) {
1314 int i;
1315 ret->merge = xcalloc(sizeof(*ret->merge),
1316 ret->merge_nr);
1317 for (i = 0; i < ret->merge_nr; i++) {
1318 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1319 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1320 if (remote_find_tracking(ret->remote, ret->merge[i])
1321 && !strcmp(ret->remote_name, "."))
1322 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1323 }
1324 }
1325 }
1326 return ret;
1327 }
1328
1329 int branch_has_merge_config(struct branch *branch)
1330 {
1331 return branch && !!branch->merge;
1332 }
1333
1334 int branch_merge_matches(struct branch *branch,
1335 int i,
1336 const char *refname)
1337 {
1338 if (!branch || i < 0 || i >= branch->merge_nr)
1339 return 0;
1340 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1341 }
1342
1343 static struct ref *get_expanded_map(const struct ref *remote_refs,
1344 const struct refspec *refspec)
1345 {
1346 const struct ref *ref;
1347 struct ref *ret = NULL;
1348 struct ref **tail = &ret;
1349
1350 char *expn_name;
1351
1352 for (ref = remote_refs; ref; ref = ref->next) {
1353 if (strchr(ref->name, '^'))
1354 continue; /* a dereference item */
1355 if (match_name_with_pattern(refspec->src, ref->name,
1356 refspec->dst, &expn_name)) {
1357 struct ref *cpy = copy_ref(ref);
1358
1359 cpy->peer_ref = alloc_ref(expn_name);
1360 free(expn_name);
1361 if (refspec->force)
1362 cpy->peer_ref->force = 1;
1363 *tail = cpy;
1364 tail = &cpy->next;
1365 }
1366 }
1367
1368 return ret;
1369 }
1370
1371 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1372 {
1373 const struct ref *ref;
1374 for (ref = refs; ref; ref = ref->next) {
1375 if (refname_match(name, ref->name, ref_fetch_rules))
1376 return ref;
1377 }
1378 return NULL;
1379 }
1380
1381 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1382 {
1383 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1384
1385 if (!ref)
1386 return NULL;
1387
1388 return copy_ref(ref);
1389 }
1390
1391 static struct ref *get_local_ref(const char *name)
1392 {
1393 if (!name || name[0] == '\0')
1394 return NULL;
1395
1396 if (!prefixcmp(name, "refs/"))
1397 return alloc_ref(name);
1398
1399 if (!prefixcmp(name, "heads/") ||
1400 !prefixcmp(name, "tags/") ||
1401 !prefixcmp(name, "remotes/"))
1402 return alloc_ref_with_prefix("refs/", 5, name);
1403
1404 return alloc_ref_with_prefix("refs/heads/", 11, name);
1405 }
1406
1407 int get_fetch_map(const struct ref *remote_refs,
1408 const struct refspec *refspec,
1409 struct ref ***tail,
1410 int missing_ok)
1411 {
1412 struct ref *ref_map, **rmp;
1413
1414 if (refspec->pattern) {
1415 ref_map = get_expanded_map(remote_refs, refspec);
1416 } else {
1417 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1418
1419 ref_map = get_remote_ref(remote_refs, name);
1420 if (!missing_ok && !ref_map)
1421 die("Couldn't find remote ref %s", name);
1422 if (ref_map) {
1423 ref_map->peer_ref = get_local_ref(refspec->dst);
1424 if (ref_map->peer_ref && refspec->force)
1425 ref_map->peer_ref->force = 1;
1426 }
1427 }
1428
1429 for (rmp = &ref_map; *rmp; ) {
1430 if ((*rmp)->peer_ref) {
1431 int st = check_ref_format((*rmp)->peer_ref->name + 5);
1432 if (st && st != CHECK_REF_FORMAT_ONELEVEL) {
1433 struct ref *ignore = *rmp;
1434 error("* Ignoring funny ref '%s' locally",
1435 (*rmp)->peer_ref->name);
1436 *rmp = (*rmp)->next;
1437 free(ignore->peer_ref);
1438 free(ignore);
1439 continue;
1440 }
1441 }
1442 rmp = &((*rmp)->next);
1443 }
1444
1445 if (ref_map)
1446 tail_link_ref(ref_map, tail);
1447
1448 return 0;
1449 }
1450
1451 int resolve_remote_symref(struct ref *ref, struct ref *list)
1452 {
1453 if (!ref->symref)
1454 return 0;
1455 for (; list; list = list->next)
1456 if (!strcmp(ref->symref, list->name)) {
1457 hashcpy(ref->old_sha1, list->old_sha1);
1458 return 0;
1459 }
1460 return 1;
1461 }
1462
1463 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1464 {
1465 while (list) {
1466 struct commit_list *temp = list;
1467 temp->item->object.flags &= ~mark;
1468 list = temp->next;
1469 free(temp);
1470 }
1471 }
1472
1473 int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1474 {
1475 struct object *o;
1476 struct commit *old, *new;
1477 struct commit_list *list, *used;
1478 int found = 0;
1479
1480 /* Both new and old must be commit-ish and new is descendant of
1481 * old. Otherwise we require --force.
1482 */
1483 o = deref_tag(parse_object(old_sha1), NULL, 0);
1484 if (!o || o->type != OBJ_COMMIT)
1485 return 0;
1486 old = (struct commit *) o;
1487
1488 o = deref_tag(parse_object(new_sha1), NULL, 0);
1489 if (!o || o->type != OBJ_COMMIT)
1490 return 0;
1491 new = (struct commit *) o;
1492
1493 if (parse_commit(new) < 0)
1494 return 0;
1495
1496 used = list = NULL;
1497 commit_list_insert(new, &list);
1498 while (list) {
1499 new = pop_most_recent_commit(&list, TMP_MARK);
1500 commit_list_insert(new, &used);
1501 if (new == old) {
1502 found = 1;
1503 break;
1504 }
1505 }
1506 unmark_and_free(list, TMP_MARK);
1507 unmark_and_free(used, TMP_MARK);
1508 return found;
1509 }
1510
1511 /*
1512 * Return true if there is anything to report, otherwise false.
1513 */
1514 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1515 {
1516 unsigned char sha1[20];
1517 struct commit *ours, *theirs;
1518 char symmetric[84];
1519 struct rev_info revs;
1520 const char *rev_argv[10], *base;
1521 int rev_argc;
1522
1523 /*
1524 * Nothing to report unless we are marked to build on top of
1525 * somebody else.
1526 */
1527 if (!branch ||
1528 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1529 return 0;
1530
1531 /*
1532 * If what we used to build on no longer exists, there is
1533 * nothing to report.
1534 */
1535 base = branch->merge[0]->dst;
1536 if (!resolve_ref(base, sha1, 1, NULL))
1537 return 0;
1538 theirs = lookup_commit_reference(sha1);
1539 if (!theirs)
1540 return 0;
1541
1542 if (!resolve_ref(branch->refname, sha1, 1, NULL))
1543 return 0;
1544 ours = lookup_commit_reference(sha1);
1545 if (!ours)
1546 return 0;
1547
1548 /* are we the same? */
1549 if (theirs == ours)
1550 return 0;
1551
1552 /* Run "rev-list --left-right ours...theirs" internally... */
1553 rev_argc = 0;
1554 rev_argv[rev_argc++] = NULL;
1555 rev_argv[rev_argc++] = "--left-right";
1556 rev_argv[rev_argc++] = symmetric;
1557 rev_argv[rev_argc++] = "--";
1558 rev_argv[rev_argc] = NULL;
1559
1560 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1561 strcpy(symmetric + 40, "...");
1562 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1563
1564 init_revisions(&revs, NULL);
1565 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1566 prepare_revision_walk(&revs);
1567
1568 /* ... and count the commits on each side. */
1569 *num_ours = 0;
1570 *num_theirs = 0;
1571 while (1) {
1572 struct commit *c = get_revision(&revs);
1573 if (!c)
1574 break;
1575 if (c->object.flags & SYMMETRIC_LEFT)
1576 (*num_ours)++;
1577 else
1578 (*num_theirs)++;
1579 }
1580
1581 /* clear object flags smudged by the above traversal */
1582 clear_commit_marks(ours, ALL_REV_FLAGS);
1583 clear_commit_marks(theirs, ALL_REV_FLAGS);
1584 return 1;
1585 }
1586
1587 /*
1588 * Return true when there is anything to report, otherwise false.
1589 */
1590 int format_tracking_info(struct branch *branch, struct strbuf *sb)
1591 {
1592 int num_ours, num_theirs;
1593 const char *base;
1594
1595 if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1596 return 0;
1597
1598 base = branch->merge[0]->dst;
1599 base = shorten_unambiguous_ref(base, 0);
1600 if (!num_theirs)
1601 strbuf_addf(sb, "Your branch is ahead of '%s' "
1602 "by %d commit%s.\n",
1603 base, num_ours, (num_ours == 1) ? "" : "s");
1604 else if (!num_ours)
1605 strbuf_addf(sb, "Your branch is behind '%s' "
1606 "by %d commit%s, "
1607 "and can be fast-forwarded.\n",
1608 base, num_theirs, (num_theirs == 1) ? "" : "s");
1609 else
1610 strbuf_addf(sb, "Your branch and '%s' have diverged,\n"
1611 "and have %d and %d different commit(s) each, "
1612 "respectively.\n",
1613 base, num_ours, num_theirs);
1614 return 1;
1615 }
1616
1617 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1618 {
1619 struct ref ***local_tail = cb_data;
1620 struct ref *ref;
1621 int len;
1622
1623 /* we already know it starts with refs/ to get here */
1624 if (check_ref_format(refname + 5))
1625 return 0;
1626
1627 len = strlen(refname) + 1;
1628 ref = xcalloc(1, sizeof(*ref) + len);
1629 hashcpy(ref->new_sha1, sha1);
1630 memcpy(ref->name, refname, len);
1631 **local_tail = ref;
1632 *local_tail = &ref->next;
1633 return 0;
1634 }
1635
1636 struct ref *get_local_heads(void)
1637 {
1638 struct ref *local_refs = NULL, **local_tail = &local_refs;
1639 for_each_ref(one_local_ref, &local_tail);
1640 return local_refs;
1641 }
1642
1643 struct ref *guess_remote_head(const struct ref *head,
1644 const struct ref *refs,
1645 int all)
1646 {
1647 const struct ref *r;
1648 struct ref *list = NULL;
1649 struct ref **tail = &list;
1650
1651 if (!head)
1652 return NULL;
1653
1654 /*
1655 * Some transports support directly peeking at
1656 * where HEAD points; if that is the case, then
1657 * we don't have to guess.
1658 */
1659 if (head->symref)
1660 return copy_ref(find_ref_by_name(refs, head->symref));
1661
1662 /* If refs/heads/master could be right, it is. */
1663 if (!all) {
1664 r = find_ref_by_name(refs, "refs/heads/master");
1665 if (r && !hashcmp(r->old_sha1, head->old_sha1))
1666 return copy_ref(r);
1667 }
1668
1669 /* Look for another ref that points there */
1670 for (r = refs; r; r = r->next) {
1671 if (r != head && !hashcmp(r->old_sha1, head->old_sha1)) {
1672 *tail = copy_ref(r);
1673 tail = &((*tail)->next);
1674 if (!all)
1675 break;
1676 }
1677 }
1678
1679 return list;
1680 }
1681
1682 struct stale_heads_info {
1683 struct remote *remote;
1684 struct string_list *ref_names;
1685 struct ref **stale_refs_tail;
1686 };
1687
1688 static int get_stale_heads_cb(const char *refname,
1689 const unsigned char *sha1, int flags, void *cb_data)
1690 {
1691 struct stale_heads_info *info = cb_data;
1692 struct refspec refspec;
1693 memset(&refspec, 0, sizeof(refspec));
1694 refspec.dst = (char *)refname;
1695 if (!remote_find_tracking(info->remote, &refspec)) {
1696 if (!((flags & REF_ISSYMREF) ||
1697 string_list_has_string(info->ref_names, refspec.src))) {
1698 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
1699 hashcpy(ref->new_sha1, sha1);
1700 }
1701 }
1702 return 0;
1703 }
1704
1705 struct ref *get_stale_heads(struct remote *remote, struct ref *fetch_map)
1706 {
1707 struct ref *ref, *stale_refs = NULL;
1708 struct string_list ref_names = { NULL, 0, 0, 0 };
1709 struct stale_heads_info info;
1710 info.remote = remote;
1711 info.ref_names = &ref_names;
1712 info.stale_refs_tail = &stale_refs;
1713 for (ref = fetch_map; ref; ref = ref->next)
1714 string_list_append(ref->name, &ref_names);
1715 sort_string_list(&ref_names);
1716 for_each_ref(get_stale_heads_cb, &info);
1717 string_list_clear(&ref_names, 0);
1718 return stale_refs;
1719 }