Merge branch 'jc/match-refs-clarify'
[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 * This function frees a refspec array.
497 * Warning: code paths should be checked to ensure that the src
498 * and dst pointers are always freeable pointers as well
499 * as the refspec pointer itself.
500 */
501 static void free_refspecs(struct refspec *refspec, int nr_refspec)
502 {
503 int i;
504
505 if (!refspec)
506 return;
507
508 for (i = 0; i < nr_refspec; i++) {
509 free(refspec[i].src);
510 free(refspec[i].dst);
511 }
512 free(refspec);
513 }
514
515 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
516 {
517 int i;
518 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
519
520 for (i = 0; i < nr_refspec; i++) {
521 size_t llen;
522 int is_glob;
523 const char *lhs, *rhs;
524 int flags;
525
526 is_glob = 0;
527
528 lhs = refspec[i];
529 if (*lhs == '+') {
530 rs[i].force = 1;
531 lhs++;
532 }
533
534 rhs = strrchr(lhs, ':');
535
536 /*
537 * Before going on, special case ":" (or "+:") as a refspec
538 * for matching refs.
539 */
540 if (!fetch && rhs == lhs && rhs[1] == '\0') {
541 rs[i].matching = 1;
542 continue;
543 }
544
545 if (rhs) {
546 size_t rlen = strlen(++rhs);
547 is_glob = (1 <= rlen && strchr(rhs, '*'));
548 rs[i].dst = xstrndup(rhs, rlen);
549 }
550
551 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
552 if (1 <= llen && memchr(lhs, '*', llen)) {
553 if ((rhs && !is_glob) || (!rhs && fetch))
554 goto invalid;
555 is_glob = 1;
556 } else if (rhs && is_glob) {
557 goto invalid;
558 }
559
560 rs[i].pattern = is_glob;
561 rs[i].src = xstrndup(lhs, llen);
562 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
563
564 if (fetch) {
565 /*
566 * LHS
567 * - empty is allowed; it means HEAD.
568 * - otherwise it must be a valid looking ref.
569 */
570 if (!*rs[i].src)
571 ; /* empty is ok */
572 else if (check_refname_format(rs[i].src, flags))
573 goto invalid;
574 /*
575 * RHS
576 * - missing is ok, and is same as empty.
577 * - empty is ok; it means not to store.
578 * - otherwise it must be a valid looking ref.
579 */
580 if (!rs[i].dst)
581 ; /* ok */
582 else if (!*rs[i].dst)
583 ; /* ok */
584 else if (check_refname_format(rs[i].dst, flags))
585 goto invalid;
586 } else {
587 /*
588 * LHS
589 * - empty is allowed; it means delete.
590 * - when wildcarded, it must be a valid looking ref.
591 * - otherwise, it must be an extended SHA-1, but
592 * there is no existing way to validate this.
593 */
594 if (!*rs[i].src)
595 ; /* empty is ok */
596 else if (is_glob) {
597 if (check_refname_format(rs[i].src, flags))
598 goto invalid;
599 }
600 else
601 ; /* anything goes, for now */
602 /*
603 * RHS
604 * - missing is allowed, but LHS then must be a
605 * valid looking ref.
606 * - empty is not allowed.
607 * - otherwise it must be a valid looking ref.
608 */
609 if (!rs[i].dst) {
610 if (check_refname_format(rs[i].src, flags))
611 goto invalid;
612 } else if (!*rs[i].dst) {
613 goto invalid;
614 } else {
615 if (check_refname_format(rs[i].dst, flags))
616 goto invalid;
617 }
618 }
619 }
620 return rs;
621
622 invalid:
623 if (verify) {
624 /*
625 * nr_refspec must be greater than zero and i must be valid
626 * since it is only possible to reach this point from within
627 * the for loop above.
628 */
629 free_refspecs(rs, i+1);
630 return NULL;
631 }
632 die("Invalid refspec '%s'", refspec[i]);
633 }
634
635 int valid_fetch_refspec(const char *fetch_refspec_str)
636 {
637 struct refspec *refspec;
638
639 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
640 free_refspecs(refspec, 1);
641 return !!refspec;
642 }
643
644 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
645 {
646 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
647 }
648
649 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
650 {
651 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
652 }
653
654 void free_refspec(int nr_refspec, struct refspec *refspec)
655 {
656 int i;
657 for (i = 0; i < nr_refspec; i++) {
658 free(refspec[i].src);
659 free(refspec[i].dst);
660 }
661 free(refspec);
662 }
663
664 static int valid_remote_nick(const char *name)
665 {
666 if (!name[0] || is_dot_or_dotdot(name))
667 return 0;
668 return !strchr(name, '/'); /* no slash */
669 }
670
671 struct remote *remote_get(const char *name)
672 {
673 struct remote *ret;
674 int name_given = 0;
675
676 read_config();
677 if (name)
678 name_given = 1;
679 else {
680 name = default_remote_name;
681 name_given = explicit_default_remote_name;
682 }
683
684 ret = make_remote(name, 0);
685 if (valid_remote_nick(name)) {
686 if (!valid_remote(ret))
687 read_remotes_file(ret);
688 if (!valid_remote(ret))
689 read_branches_file(ret);
690 }
691 if (name_given && !valid_remote(ret))
692 add_url_alias(ret, name);
693 if (!valid_remote(ret))
694 return NULL;
695 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
696 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
697 return ret;
698 }
699
700 int remote_is_configured(const char *name)
701 {
702 int i;
703 read_config();
704
705 for (i = 0; i < remotes_nr; i++)
706 if (!strcmp(name, remotes[i]->name))
707 return 1;
708 return 0;
709 }
710
711 int for_each_remote(each_remote_fn fn, void *priv)
712 {
713 int i, result = 0;
714 read_config();
715 for (i = 0; i < remotes_nr && !result; i++) {
716 struct remote *r = remotes[i];
717 if (!r)
718 continue;
719 if (!r->fetch)
720 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
721 r->fetch_refspec);
722 if (!r->push)
723 r->push = parse_push_refspec(r->push_refspec_nr,
724 r->push_refspec);
725 result = fn(r, priv);
726 }
727 return result;
728 }
729
730 void ref_remove_duplicates(struct ref *ref_map)
731 {
732 struct string_list refs = STRING_LIST_INIT_NODUP;
733 struct string_list_item *item = NULL;
734 struct ref *prev = NULL, *next = NULL;
735 for (; ref_map; prev = ref_map, ref_map = next) {
736 next = ref_map->next;
737 if (!ref_map->peer_ref)
738 continue;
739
740 item = string_list_lookup(&refs, ref_map->peer_ref->name);
741 if (item) {
742 if (strcmp(((struct ref *)item->util)->name,
743 ref_map->name))
744 die("%s tracks both %s and %s",
745 ref_map->peer_ref->name,
746 ((struct ref *)item->util)->name,
747 ref_map->name);
748 prev->next = ref_map->next;
749 free(ref_map->peer_ref);
750 free(ref_map);
751 ref_map = prev; /* skip this; we freed it */
752 continue;
753 }
754
755 item = string_list_insert(&refs, ref_map->peer_ref->name);
756 item->util = ref_map;
757 }
758 string_list_clear(&refs, 0);
759 }
760
761 int remote_has_url(struct remote *remote, const char *url)
762 {
763 int i;
764 for (i = 0; i < remote->url_nr; i++) {
765 if (!strcmp(remote->url[i], url))
766 return 1;
767 }
768 return 0;
769 }
770
771 static int match_name_with_pattern(const char *key, const char *name,
772 const char *value, char **result)
773 {
774 const char *kstar = strchr(key, '*');
775 size_t klen;
776 size_t ksuffixlen;
777 size_t namelen;
778 int ret;
779 if (!kstar)
780 die("Key '%s' of pattern had no '*'", key);
781 klen = kstar - key;
782 ksuffixlen = strlen(kstar + 1);
783 namelen = strlen(name);
784 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
785 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
786 if (ret && value) {
787 const char *vstar = strchr(value, '*');
788 size_t vlen;
789 size_t vsuffixlen;
790 if (!vstar)
791 die("Value '%s' of pattern has no '*'", value);
792 vlen = vstar - value;
793 vsuffixlen = strlen(vstar + 1);
794 *result = xmalloc(vlen + vsuffixlen +
795 strlen(name) -
796 klen - ksuffixlen + 1);
797 strncpy(*result, value, vlen);
798 strncpy(*result + vlen,
799 name + klen, namelen - klen - ksuffixlen);
800 strcpy(*result + vlen + namelen - klen - ksuffixlen,
801 vstar + 1);
802 }
803 return ret;
804 }
805
806 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
807 const char *name)
808 {
809 int i;
810 char *ret = NULL;
811 for (i = 0; i < nr_refspec; i++) {
812 struct refspec *refspec = refspecs + i;
813 if (refspec->pattern) {
814 if (match_name_with_pattern(refspec->src, name,
815 refspec->dst, &ret))
816 return ret;
817 } else if (!strcmp(refspec->src, name))
818 return xstrdup(refspec->dst);
819 }
820 return NULL;
821 }
822
823 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
824 {
825 int find_src = refspec->src == NULL;
826 char *needle, **result;
827 int i;
828
829 if (find_src) {
830 if (!refspec->dst)
831 return error("find_tracking: need either src or dst");
832 needle = refspec->dst;
833 result = &refspec->src;
834 } else {
835 needle = refspec->src;
836 result = &refspec->dst;
837 }
838
839 for (i = 0; i < remote->fetch_refspec_nr; i++) {
840 struct refspec *fetch = &remote->fetch[i];
841 const char *key = find_src ? fetch->dst : fetch->src;
842 const char *value = find_src ? fetch->src : fetch->dst;
843 if (!fetch->dst)
844 continue;
845 if (fetch->pattern) {
846 if (match_name_with_pattern(key, needle, value, result)) {
847 refspec->force = fetch->force;
848 return 0;
849 }
850 } else if (!strcmp(needle, key)) {
851 *result = xstrdup(value);
852 refspec->force = fetch->force;
853 return 0;
854 }
855 }
856 return -1;
857 }
858
859 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
860 const char *name)
861 {
862 size_t len = strlen(name);
863 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
864 memcpy(ref->name, prefix, prefixlen);
865 memcpy(ref->name + prefixlen, name, len);
866 return ref;
867 }
868
869 struct ref *alloc_ref(const char *name)
870 {
871 return alloc_ref_with_prefix("", 0, name);
872 }
873
874 struct ref *copy_ref(const struct ref *ref)
875 {
876 struct ref *cpy;
877 size_t len;
878 if (!ref)
879 return NULL;
880 len = strlen(ref->name);
881 cpy = xmalloc(sizeof(struct ref) + len + 1);
882 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
883 cpy->next = NULL;
884 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
885 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
886 cpy->peer_ref = copy_ref(ref->peer_ref);
887 return cpy;
888 }
889
890 struct ref *copy_ref_list(const struct ref *ref)
891 {
892 struct ref *ret = NULL;
893 struct ref **tail = &ret;
894 while (ref) {
895 *tail = copy_ref(ref);
896 ref = ref->next;
897 tail = &((*tail)->next);
898 }
899 return ret;
900 }
901
902 static void free_ref(struct ref *ref)
903 {
904 if (!ref)
905 return;
906 free_ref(ref->peer_ref);
907 free(ref->remote_status);
908 free(ref->symref);
909 free(ref);
910 }
911
912 void free_refs(struct ref *ref)
913 {
914 struct ref *next;
915 while (ref) {
916 next = ref->next;
917 free_ref(ref);
918 ref = next;
919 }
920 }
921
922 static int count_refspec_match(const char *pattern,
923 struct ref *refs,
924 struct ref **matched_ref)
925 {
926 int patlen = strlen(pattern);
927 struct ref *matched_weak = NULL;
928 struct ref *matched = NULL;
929 int weak_match = 0;
930 int match = 0;
931
932 for (weak_match = match = 0; refs; refs = refs->next) {
933 char *name = refs->name;
934 int namelen = strlen(name);
935
936 if (!refname_match(pattern, name, ref_rev_parse_rules))
937 continue;
938
939 /* A match is "weak" if it is with refs outside
940 * heads or tags, and did not specify the pattern
941 * in full (e.g. "refs/remotes/origin/master") or at
942 * least from the toplevel (e.g. "remotes/origin/master");
943 * otherwise "git push $URL master" would result in
944 * ambiguity between remotes/origin/master and heads/master
945 * at the remote site.
946 */
947 if (namelen != patlen &&
948 patlen != namelen - 5 &&
949 prefixcmp(name, "refs/heads/") &&
950 prefixcmp(name, "refs/tags/")) {
951 /* We want to catch the case where only weak
952 * matches are found and there are multiple
953 * matches, and where more than one strong
954 * matches are found, as ambiguous. One
955 * strong match with zero or more weak matches
956 * are acceptable as a unique match.
957 */
958 matched_weak = refs;
959 weak_match++;
960 }
961 else {
962 matched = refs;
963 match++;
964 }
965 }
966 if (!matched) {
967 *matched_ref = matched_weak;
968 return weak_match;
969 }
970 else {
971 *matched_ref = matched;
972 return match;
973 }
974 }
975
976 static void tail_link_ref(struct ref *ref, struct ref ***tail)
977 {
978 **tail = ref;
979 while (ref->next)
980 ref = ref->next;
981 *tail = &ref->next;
982 }
983
984 static struct ref *try_explicit_object_name(const char *name)
985 {
986 unsigned char sha1[20];
987 struct ref *ref;
988
989 if (!*name) {
990 ref = alloc_ref("(delete)");
991 hashclr(ref->new_sha1);
992 return ref;
993 }
994 if (get_sha1(name, sha1))
995 return NULL;
996 ref = alloc_ref(name);
997 hashcpy(ref->new_sha1, sha1);
998 return ref;
999 }
1000
1001 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1002 {
1003 struct ref *ret = alloc_ref(name);
1004 tail_link_ref(ret, tail);
1005 return ret;
1006 }
1007
1008 static char *guess_ref(const char *name, struct ref *peer)
1009 {
1010 struct strbuf buf = STRBUF_INIT;
1011 unsigned char sha1[20];
1012
1013 const char *r = resolve_ref(peer->name, sha1, 1, NULL);
1014 if (!r)
1015 return NULL;
1016
1017 if (!prefixcmp(r, "refs/heads/"))
1018 strbuf_addstr(&buf, "refs/heads/");
1019 else if (!prefixcmp(r, "refs/tags/"))
1020 strbuf_addstr(&buf, "refs/tags/");
1021 else
1022 return NULL;
1023
1024 strbuf_addstr(&buf, name);
1025 return strbuf_detach(&buf, NULL);
1026 }
1027
1028 static int match_explicit(struct ref *src, struct ref *dst,
1029 struct ref ***dst_tail,
1030 struct refspec *rs)
1031 {
1032 struct ref *matched_src, *matched_dst;
1033 int copy_src;
1034
1035 const char *dst_value = rs->dst;
1036 char *dst_guess;
1037
1038 if (rs->pattern || rs->matching)
1039 return 0;
1040
1041 matched_src = matched_dst = NULL;
1042 switch (count_refspec_match(rs->src, src, &matched_src)) {
1043 case 1:
1044 copy_src = 1;
1045 break;
1046 case 0:
1047 /* The source could be in the get_sha1() format
1048 * not a reference name. :refs/other is a
1049 * way to delete 'other' ref at the remote end.
1050 */
1051 matched_src = try_explicit_object_name(rs->src);
1052 if (!matched_src)
1053 return error("src refspec %s does not match any.", rs->src);
1054 copy_src = 0;
1055 break;
1056 default:
1057 return error("src refspec %s matches more than one.", rs->src);
1058 }
1059
1060 if (!dst_value) {
1061 unsigned char sha1[20];
1062 int flag;
1063
1064 dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
1065 if (!dst_value ||
1066 ((flag & REF_ISSYMREF) &&
1067 prefixcmp(dst_value, "refs/heads/")))
1068 die("%s cannot be resolved to branch.",
1069 matched_src->name);
1070 }
1071
1072 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1073 case 1:
1074 break;
1075 case 0:
1076 if (!memcmp(dst_value, "refs/", 5))
1077 matched_dst = make_linked_ref(dst_value, dst_tail);
1078 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1079 matched_dst = make_linked_ref(dst_guess, dst_tail);
1080 else
1081 error("unable to push to unqualified destination: %s\n"
1082 "The destination refspec neither matches an "
1083 "existing ref on the remote nor\n"
1084 "begins with refs/, and we are unable to "
1085 "guess a prefix based on the source ref.",
1086 dst_value);
1087 break;
1088 default:
1089 matched_dst = NULL;
1090 error("dst refspec %s matches more than one.",
1091 dst_value);
1092 break;
1093 }
1094 if (!matched_dst)
1095 return -1;
1096 if (matched_dst->peer_ref)
1097 return error("dst ref %s receives from more than one src.",
1098 matched_dst->name);
1099 else {
1100 matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1101 matched_dst->force = rs->force;
1102 }
1103 return 0;
1104 }
1105
1106 static int match_explicit_refs(struct ref *src, struct ref *dst,
1107 struct ref ***dst_tail, struct refspec *rs,
1108 int rs_nr)
1109 {
1110 int i, errs;
1111 for (i = errs = 0; i < rs_nr; i++)
1112 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1113 return errs;
1114 }
1115
1116 static const struct refspec *check_pattern_match(const struct refspec *rs,
1117 int rs_nr,
1118 const struct ref *src)
1119 {
1120 int i;
1121 int matching_refs = -1;
1122 for (i = 0; i < rs_nr; i++) {
1123 if (rs[i].matching &&
1124 (matching_refs == -1 || rs[i].force)) {
1125 matching_refs = i;
1126 continue;
1127 }
1128
1129 if (rs[i].pattern && match_name_with_pattern(rs[i].src, src->name,
1130 NULL, NULL))
1131 return rs + i;
1132 }
1133 if (matching_refs != -1)
1134 return rs + matching_refs;
1135 else
1136 return NULL;
1137 }
1138
1139 static struct ref **tail_ref(struct ref **head)
1140 {
1141 struct ref **tail = head;
1142 while (*tail)
1143 tail = &((*tail)->next);
1144 return tail;
1145 }
1146
1147 /*
1148 * Given the set of refs the local repository has, the set of refs the
1149 * remote repository has, and the refspec used for push, determine
1150 * what remote refs we will update and with what value by setting
1151 * peer_ref (which object is being pushed) and force (if the push is
1152 * forced) in elements of "dst". The function may add new elements to
1153 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1154 */
1155 int match_push_refs(struct ref *src, struct ref **dst,
1156 int nr_refspec, const char **refspec, int flags)
1157 {
1158 struct refspec *rs;
1159 int send_all = flags & MATCH_REFS_ALL;
1160 int send_mirror = flags & MATCH_REFS_MIRROR;
1161 int errs;
1162 static const char *default_refspec[] = { ":", NULL };
1163 struct ref **dst_tail = tail_ref(dst);
1164
1165 if (!nr_refspec) {
1166 nr_refspec = 1;
1167 refspec = default_refspec;
1168 }
1169 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1170 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1171
1172 /* pick the remainder */
1173 for ( ; src; src = src->next) {
1174 struct ref *dst_peer;
1175 const struct refspec *pat = NULL;
1176 char *dst_name;
1177 if (src->peer_ref)
1178 continue;
1179
1180 pat = check_pattern_match(rs, nr_refspec, src);
1181 if (!pat)
1182 continue;
1183
1184 if (pat->matching) {
1185 /*
1186 * "matching refs"; traditionally we pushed everything
1187 * including refs outside refs/heads/ hierarchy, but
1188 * that does not make much sense these days.
1189 */
1190 if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
1191 continue;
1192 dst_name = xstrdup(src->name);
1193
1194 } else {
1195 const char *dst_side = pat->dst ? pat->dst : pat->src;
1196 if (!match_name_with_pattern(pat->src, src->name,
1197 dst_side, &dst_name))
1198 die("Didn't think it matches any more");
1199 }
1200 dst_peer = find_ref_by_name(*dst, dst_name);
1201 if (dst_peer) {
1202 if (dst_peer->peer_ref)
1203 /* We're already sending something to this ref. */
1204 goto free_name;
1205
1206 } else {
1207 if (pat->matching && !(send_all || send_mirror))
1208 /*
1209 * Remote doesn't have it, and we have no
1210 * explicit pattern, and we don't have
1211 * --all nor --mirror.
1212 */
1213 goto free_name;
1214
1215 /* Create a new one and link it */
1216 dst_peer = make_linked_ref(dst_name, &dst_tail);
1217 hashcpy(dst_peer->new_sha1, src->new_sha1);
1218 }
1219 dst_peer->peer_ref = copy_ref(src);
1220 dst_peer->force = pat->force;
1221 free_name:
1222 free(dst_name);
1223 }
1224 if (errs)
1225 return -1;
1226 return 0;
1227 }
1228
1229 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1230 int force_update)
1231 {
1232 struct ref *ref;
1233
1234 for (ref = remote_refs; ref; ref = ref->next) {
1235 if (ref->peer_ref)
1236 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1237 else if (!send_mirror)
1238 continue;
1239
1240 ref->deletion = is_null_sha1(ref->new_sha1);
1241 if (!ref->deletion &&
1242 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1243 ref->status = REF_STATUS_UPTODATE;
1244 continue;
1245 }
1246
1247 /* This part determines what can overwrite what.
1248 * The rules are:
1249 *
1250 * (0) you can always use --force or +A:B notation to
1251 * selectively force individual ref pairs.
1252 *
1253 * (1) if the old thing does not exist, it is OK.
1254 *
1255 * (2) if you do not have the old thing, you are not allowed
1256 * to overwrite it; you would not know what you are losing
1257 * otherwise.
1258 *
1259 * (3) if both new and old are commit-ish, and new is a
1260 * descendant of old, it is OK.
1261 *
1262 * (4) regardless of all of the above, removing :B is
1263 * always allowed.
1264 */
1265
1266 ref->nonfastforward =
1267 !ref->deletion &&
1268 !is_null_sha1(ref->old_sha1) &&
1269 (!has_sha1_file(ref->old_sha1)
1270 || !ref_newer(ref->new_sha1, ref->old_sha1));
1271
1272 if (ref->nonfastforward && !ref->force && !force_update) {
1273 ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
1274 continue;
1275 }
1276 }
1277 }
1278
1279 struct branch *branch_get(const char *name)
1280 {
1281 struct branch *ret;
1282
1283 read_config();
1284 if (!name || !*name || !strcmp(name, "HEAD"))
1285 ret = current_branch;
1286 else
1287 ret = make_branch(name, 0);
1288 if (ret && ret->remote_name) {
1289 ret->remote = remote_get(ret->remote_name);
1290 if (ret->merge_nr) {
1291 int i;
1292 ret->merge = xcalloc(sizeof(*ret->merge),
1293 ret->merge_nr);
1294 for (i = 0; i < ret->merge_nr; i++) {
1295 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1296 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1297 if (remote_find_tracking(ret->remote, ret->merge[i])
1298 && !strcmp(ret->remote_name, "."))
1299 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1300 }
1301 }
1302 }
1303 return ret;
1304 }
1305
1306 int branch_has_merge_config(struct branch *branch)
1307 {
1308 return branch && !!branch->merge;
1309 }
1310
1311 int branch_merge_matches(struct branch *branch,
1312 int i,
1313 const char *refname)
1314 {
1315 if (!branch || i < 0 || i >= branch->merge_nr)
1316 return 0;
1317 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1318 }
1319
1320 static struct ref *get_expanded_map(const struct ref *remote_refs,
1321 const struct refspec *refspec)
1322 {
1323 const struct ref *ref;
1324 struct ref *ret = NULL;
1325 struct ref **tail = &ret;
1326
1327 char *expn_name;
1328
1329 for (ref = remote_refs; ref; ref = ref->next) {
1330 if (strchr(ref->name, '^'))
1331 continue; /* a dereference item */
1332 if (match_name_with_pattern(refspec->src, ref->name,
1333 refspec->dst, &expn_name)) {
1334 struct ref *cpy = copy_ref(ref);
1335
1336 cpy->peer_ref = alloc_ref(expn_name);
1337 free(expn_name);
1338 if (refspec->force)
1339 cpy->peer_ref->force = 1;
1340 *tail = cpy;
1341 tail = &cpy->next;
1342 }
1343 }
1344
1345 return ret;
1346 }
1347
1348 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1349 {
1350 const struct ref *ref;
1351 for (ref = refs; ref; ref = ref->next) {
1352 if (refname_match(name, ref->name, ref_fetch_rules))
1353 return ref;
1354 }
1355 return NULL;
1356 }
1357
1358 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1359 {
1360 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1361
1362 if (!ref)
1363 return NULL;
1364
1365 return copy_ref(ref);
1366 }
1367
1368 static struct ref *get_local_ref(const char *name)
1369 {
1370 if (!name || name[0] == '\0')
1371 return NULL;
1372
1373 if (!prefixcmp(name, "refs/"))
1374 return alloc_ref(name);
1375
1376 if (!prefixcmp(name, "heads/") ||
1377 !prefixcmp(name, "tags/") ||
1378 !prefixcmp(name, "remotes/"))
1379 return alloc_ref_with_prefix("refs/", 5, name);
1380
1381 return alloc_ref_with_prefix("refs/heads/", 11, name);
1382 }
1383
1384 int get_fetch_map(const struct ref *remote_refs,
1385 const struct refspec *refspec,
1386 struct ref ***tail,
1387 int missing_ok)
1388 {
1389 struct ref *ref_map, **rmp;
1390
1391 if (refspec->pattern) {
1392 ref_map = get_expanded_map(remote_refs, refspec);
1393 } else {
1394 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1395
1396 ref_map = get_remote_ref(remote_refs, name);
1397 if (!missing_ok && !ref_map)
1398 die("Couldn't find remote ref %s", name);
1399 if (ref_map) {
1400 ref_map->peer_ref = get_local_ref(refspec->dst);
1401 if (ref_map->peer_ref && refspec->force)
1402 ref_map->peer_ref->force = 1;
1403 }
1404 }
1405
1406 for (rmp = &ref_map; *rmp; ) {
1407 if ((*rmp)->peer_ref) {
1408 if (check_refname_format((*rmp)->peer_ref->name + 5,
1409 REFNAME_ALLOW_ONELEVEL)) {
1410 struct ref *ignore = *rmp;
1411 error("* Ignoring funny ref '%s' locally",
1412 (*rmp)->peer_ref->name);
1413 *rmp = (*rmp)->next;
1414 free(ignore->peer_ref);
1415 free(ignore);
1416 continue;
1417 }
1418 }
1419 rmp = &((*rmp)->next);
1420 }
1421
1422 if (ref_map)
1423 tail_link_ref(ref_map, tail);
1424
1425 return 0;
1426 }
1427
1428 int resolve_remote_symref(struct ref *ref, struct ref *list)
1429 {
1430 if (!ref->symref)
1431 return 0;
1432 for (; list; list = list->next)
1433 if (!strcmp(ref->symref, list->name)) {
1434 hashcpy(ref->old_sha1, list->old_sha1);
1435 return 0;
1436 }
1437 return 1;
1438 }
1439
1440 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1441 {
1442 while (list) {
1443 struct commit_list *temp = list;
1444 temp->item->object.flags &= ~mark;
1445 list = temp->next;
1446 free(temp);
1447 }
1448 }
1449
1450 int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1451 {
1452 struct object *o;
1453 struct commit *old, *new;
1454 struct commit_list *list, *used;
1455 int found = 0;
1456
1457 /* Both new and old must be commit-ish and new is descendant of
1458 * old. Otherwise we require --force.
1459 */
1460 o = deref_tag(parse_object(old_sha1), NULL, 0);
1461 if (!o || o->type != OBJ_COMMIT)
1462 return 0;
1463 old = (struct commit *) o;
1464
1465 o = deref_tag(parse_object(new_sha1), NULL, 0);
1466 if (!o || o->type != OBJ_COMMIT)
1467 return 0;
1468 new = (struct commit *) o;
1469
1470 if (parse_commit(new) < 0)
1471 return 0;
1472
1473 used = list = NULL;
1474 commit_list_insert(new, &list);
1475 while (list) {
1476 new = pop_most_recent_commit(&list, TMP_MARK);
1477 commit_list_insert(new, &used);
1478 if (new == old) {
1479 found = 1;
1480 break;
1481 }
1482 }
1483 unmark_and_free(list, TMP_MARK);
1484 unmark_and_free(used, TMP_MARK);
1485 return found;
1486 }
1487
1488 /*
1489 * Return true if there is anything to report, otherwise false.
1490 */
1491 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1492 {
1493 unsigned char sha1[20];
1494 struct commit *ours, *theirs;
1495 char symmetric[84];
1496 struct rev_info revs;
1497 const char *rev_argv[10], *base;
1498 int rev_argc;
1499
1500 /*
1501 * Nothing to report unless we are marked to build on top of
1502 * somebody else.
1503 */
1504 if (!branch ||
1505 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1506 return 0;
1507
1508 /*
1509 * If what we used to build on no longer exists, there is
1510 * nothing to report.
1511 */
1512 base = branch->merge[0]->dst;
1513 if (!resolve_ref(base, sha1, 1, NULL))
1514 return 0;
1515 theirs = lookup_commit_reference(sha1);
1516 if (!theirs)
1517 return 0;
1518
1519 if (!resolve_ref(branch->refname, sha1, 1, NULL))
1520 return 0;
1521 ours = lookup_commit_reference(sha1);
1522 if (!ours)
1523 return 0;
1524
1525 /* are we the same? */
1526 if (theirs == ours)
1527 return 0;
1528
1529 /* Run "rev-list --left-right ours...theirs" internally... */
1530 rev_argc = 0;
1531 rev_argv[rev_argc++] = NULL;
1532 rev_argv[rev_argc++] = "--left-right";
1533 rev_argv[rev_argc++] = symmetric;
1534 rev_argv[rev_argc++] = "--";
1535 rev_argv[rev_argc] = NULL;
1536
1537 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1538 strcpy(symmetric + 40, "...");
1539 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1540
1541 init_revisions(&revs, NULL);
1542 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1543 prepare_revision_walk(&revs);
1544
1545 /* ... and count the commits on each side. */
1546 *num_ours = 0;
1547 *num_theirs = 0;
1548 while (1) {
1549 struct commit *c = get_revision(&revs);
1550 if (!c)
1551 break;
1552 if (c->object.flags & SYMMETRIC_LEFT)
1553 (*num_ours)++;
1554 else
1555 (*num_theirs)++;
1556 }
1557
1558 /* clear object flags smudged by the above traversal */
1559 clear_commit_marks(ours, ALL_REV_FLAGS);
1560 clear_commit_marks(theirs, ALL_REV_FLAGS);
1561 return 1;
1562 }
1563
1564 /*
1565 * Return true when there is anything to report, otherwise false.
1566 */
1567 int format_tracking_info(struct branch *branch, struct strbuf *sb)
1568 {
1569 int num_ours, num_theirs;
1570 const char *base;
1571
1572 if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1573 return 0;
1574
1575 base = branch->merge[0]->dst;
1576 base = shorten_unambiguous_ref(base, 0);
1577 if (!num_theirs)
1578 strbuf_addf(sb, "Your branch is ahead of '%s' "
1579 "by %d commit%s.\n",
1580 base, num_ours, (num_ours == 1) ? "" : "s");
1581 else if (!num_ours)
1582 strbuf_addf(sb, "Your branch is behind '%s' "
1583 "by %d commit%s, "
1584 "and can be fast-forwarded.\n",
1585 base, num_theirs, (num_theirs == 1) ? "" : "s");
1586 else
1587 strbuf_addf(sb, "Your branch and '%s' have diverged,\n"
1588 "and have %d and %d different commit(s) each, "
1589 "respectively.\n",
1590 base, num_ours, num_theirs);
1591 return 1;
1592 }
1593
1594 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1595 {
1596 struct ref ***local_tail = cb_data;
1597 struct ref *ref;
1598 int len;
1599
1600 /* we already know it starts with refs/ to get here */
1601 if (check_refname_format(refname + 5, 0))
1602 return 0;
1603
1604 len = strlen(refname) + 1;
1605 ref = xcalloc(1, sizeof(*ref) + len);
1606 hashcpy(ref->new_sha1, sha1);
1607 memcpy(ref->name, refname, len);
1608 **local_tail = ref;
1609 *local_tail = &ref->next;
1610 return 0;
1611 }
1612
1613 struct ref *get_local_heads(void)
1614 {
1615 struct ref *local_refs = NULL, **local_tail = &local_refs;
1616 for_each_ref(one_local_ref, &local_tail);
1617 return local_refs;
1618 }
1619
1620 struct ref *guess_remote_head(const struct ref *head,
1621 const struct ref *refs,
1622 int all)
1623 {
1624 const struct ref *r;
1625 struct ref *list = NULL;
1626 struct ref **tail = &list;
1627
1628 if (!head)
1629 return NULL;
1630
1631 /*
1632 * Some transports support directly peeking at
1633 * where HEAD points; if that is the case, then
1634 * we don't have to guess.
1635 */
1636 if (head->symref)
1637 return copy_ref(find_ref_by_name(refs, head->symref));
1638
1639 /* If refs/heads/master could be right, it is. */
1640 if (!all) {
1641 r = find_ref_by_name(refs, "refs/heads/master");
1642 if (r && !hashcmp(r->old_sha1, head->old_sha1))
1643 return copy_ref(r);
1644 }
1645
1646 /* Look for another ref that points there */
1647 for (r = refs; r; r = r->next) {
1648 if (r != head &&
1649 !prefixcmp(r->name, "refs/heads/") &&
1650 !hashcmp(r->old_sha1, head->old_sha1)) {
1651 *tail = copy_ref(r);
1652 tail = &((*tail)->next);
1653 if (!all)
1654 break;
1655 }
1656 }
1657
1658 return list;
1659 }
1660
1661 struct stale_heads_info {
1662 struct remote *remote;
1663 struct string_list *ref_names;
1664 struct ref **stale_refs_tail;
1665 };
1666
1667 static int get_stale_heads_cb(const char *refname,
1668 const unsigned char *sha1, int flags, void *cb_data)
1669 {
1670 struct stale_heads_info *info = cb_data;
1671 struct refspec refspec;
1672 memset(&refspec, 0, sizeof(refspec));
1673 refspec.dst = (char *)refname;
1674 if (!remote_find_tracking(info->remote, &refspec)) {
1675 if (!((flags & REF_ISSYMREF) ||
1676 string_list_has_string(info->ref_names, refspec.src))) {
1677 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
1678 hashcpy(ref->new_sha1, sha1);
1679 }
1680 }
1681 return 0;
1682 }
1683
1684 struct ref *get_stale_heads(struct remote *remote, struct ref *fetch_map)
1685 {
1686 struct ref *ref, *stale_refs = NULL;
1687 struct string_list ref_names = STRING_LIST_INIT_NODUP;
1688 struct stale_heads_info info;
1689 info.remote = remote;
1690 info.ref_names = &ref_names;
1691 info.stale_refs_tail = &stale_refs;
1692 for (ref = fetch_map; ref; ref = ref->next)
1693 string_list_append(&ref_names, ref->name);
1694 sort_string_list(&ref_names);
1695 for_each_ref(get_stale_heads_cb, &info);
1696 string_list_clear(&ref_names, 0);
1697 return stale_refs;
1698 }