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Merge branch 'jc/remove-treesame-parent-in-simplify-merges'
[git/jnareb-git.git] / remote.c
blob57f36e14da7a8a33ae8c02a4bf46492936c79fdd
1 #include "cache.h"
2 #include "remote.h"
3 #include "refs.h"
4 #include "commit.h"
5 #include "diff.h"
6 #include "revision.h"
7 #include "dir.h"
8 #include "tag.h"
9 #include "string-list.h"
10 #include "mergesort.h"
11
12 enum map_direction { FROM_SRC, FROM_DST };
13
14 static struct refspec s_tag_refspec = {
15 0,
16 1,
17 0,
18 0,
19 "refs/tags/*",
20 "refs/tags/*"
21 };
22
23 const struct refspec *tag_refspec = &s_tag_refspec;
24
25 struct counted_string {
26 size_t len;
27 const char *s;
28 };
29 struct rewrite {
30 const char *base;
31 size_t baselen;
32 struct counted_string *instead_of;
33 int instead_of_nr;
34 int instead_of_alloc;
35 };
36 struct rewrites {
37 struct rewrite **rewrite;
38 int rewrite_alloc;
39 int rewrite_nr;
40 };
41
42 static struct remote **remotes;
43 static int remotes_alloc;
44 static int remotes_nr;
45
46 static struct branch **branches;
47 static int branches_alloc;
48 static int branches_nr;
49
50 static struct branch *current_branch;
51 static const char *default_remote_name;
52 static int explicit_default_remote_name;
53
54 static struct rewrites rewrites;
55 static struct rewrites rewrites_push;
56
57 #define BUF_SIZE (2048)
58 static char buffer[BUF_SIZE];
59
60 static int valid_remote(const struct remote *remote)
61 {
62 return (!!remote->url) || (!!remote->foreign_vcs);
63 }
64
65 static const char *alias_url(const char *url, struct rewrites *r)
66 {
67 int i, j;
68 char *ret;
69 struct counted_string *longest;
70 int longest_i;
71
72 longest = NULL;
73 longest_i = -1;
74 for (i = 0; i < r->rewrite_nr; i++) {
75 if (!r->rewrite[i])
76 continue;
77 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
78 if (!prefixcmp(url, r->rewrite[i]->instead_of[j].s) &&
79 (!longest ||
80 longest->len < r->rewrite[i]->instead_of[j].len)) {
81 longest = &(r->rewrite[i]->instead_of[j]);
82 longest_i = i;
83 }
84 }
85 }
86 if (!longest)
87 return url;
88
89 ret = xmalloc(r->rewrite[longest_i]->baselen +
90 (strlen(url) - longest->len) + 1);
91 strcpy(ret, r->rewrite[longest_i]->base);
92 strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
93 return ret;
94 }
95
96 static void add_push_refspec(struct remote *remote, const char *ref)
97 {
98 ALLOC_GROW(remote->push_refspec,
99 remote->push_refspec_nr + 1,
100 remote->push_refspec_alloc);
101 remote->push_refspec[remote->push_refspec_nr++] = ref;
102 }
103
104 static void add_fetch_refspec(struct remote *remote, const char *ref)
105 {
106 ALLOC_GROW(remote->fetch_refspec,
107 remote->fetch_refspec_nr + 1,
108 remote->fetch_refspec_alloc);
109 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
110 }
111
112 static void add_url(struct remote *remote, const char *url)
113 {
114 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
115 remote->url[remote->url_nr++] = url;
116 }
117
118 static void add_pushurl(struct remote *remote, const char *pushurl)
119 {
120 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
121 remote->pushurl[remote->pushurl_nr++] = pushurl;
122 }
123
124 static void add_pushurl_alias(struct remote *remote, const char *url)
125 {
126 const char *pushurl = alias_url(url, &rewrites_push);
127 if (pushurl != url)
128 add_pushurl(remote, pushurl);
129 }
130
131 static void add_url_alias(struct remote *remote, const char *url)
132 {
133 add_url(remote, alias_url(url, &rewrites));
134 add_pushurl_alias(remote, url);
135 }
136
137 static struct remote *make_remote(const char *name, int len)
138 {
139 struct remote *ret;
140 int i;
141
142 for (i = 0; i < remotes_nr; i++) {
143 if (len ? (!strncmp(name, remotes[i]->name, len) &&
144 !remotes[i]->name[len]) :
145 !strcmp(name, remotes[i]->name))
146 return remotes[i];
147 }
148
149 ret = xcalloc(1, sizeof(struct remote));
150 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
151 remotes[remotes_nr++] = ret;
152 if (len)
153 ret->name = xstrndup(name, len);
154 else
155 ret->name = xstrdup(name);
156 return ret;
157 }
158
159 static void add_merge(struct branch *branch, const char *name)
160 {
161 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
162 branch->merge_alloc);
163 branch->merge_name[branch->merge_nr++] = name;
164 }
165
166 static struct branch *make_branch(const char *name, int len)
167 {
168 struct branch *ret;
169 int i;
170 char *refname;
171
172 for (i = 0; i < branches_nr; i++) {
173 if (len ? (!strncmp(name, branches[i]->name, len) &&
174 !branches[i]->name[len]) :
175 !strcmp(name, branches[i]->name))
176 return branches[i];
177 }
178
179 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
180 ret = xcalloc(1, sizeof(struct branch));
181 branches[branches_nr++] = ret;
182 if (len)
183 ret->name = xstrndup(name, len);
184 else
185 ret->name = xstrdup(name);
186 refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
187 strcpy(refname, "refs/heads/");
188 strcpy(refname + strlen("refs/heads/"), ret->name);
189 ret->refname = refname;
190
191 return ret;
192 }
193
194 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
195 {
196 struct rewrite *ret;
197 int i;
198
199 for (i = 0; i < r->rewrite_nr; i++) {
200 if (len
201 ? (len == r->rewrite[i]->baselen &&
202 !strncmp(base, r->rewrite[i]->base, len))
203 : !strcmp(base, r->rewrite[i]->base))
204 return r->rewrite[i];
205 }
206
207 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
208 ret = xcalloc(1, sizeof(struct rewrite));
209 r->rewrite[r->rewrite_nr++] = ret;
210 if (len) {
211 ret->base = xstrndup(base, len);
212 ret->baselen = len;
213 }
214 else {
215 ret->base = xstrdup(base);
216 ret->baselen = strlen(base);
217 }
218 return ret;
219 }
220
221 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
222 {
223 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
224 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
225 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
226 rewrite->instead_of_nr++;
227 }
228
229 static void read_remotes_file(struct remote *remote)
230 {
231 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
232
233 if (!f)
234 return;
235 remote->origin = REMOTE_REMOTES;
236 while (fgets(buffer, BUF_SIZE, f)) {
237 int value_list;
238 char *s, *p;
239
240 if (!prefixcmp(buffer, "URL:")) {
241 value_list = 0;
242 s = buffer + 4;
243 } else if (!prefixcmp(buffer, "Push:")) {
244 value_list = 1;
245 s = buffer + 5;
246 } else if (!prefixcmp(buffer, "Pull:")) {
247 value_list = 2;
248 s = buffer + 5;
249 } else
250 continue;
251
252 while (isspace(*s))
253 s++;
254 if (!*s)
255 continue;
256
257 p = s + strlen(s);
258 while (isspace(p[-1]))
259 *--p = 0;
260
261 switch (value_list) {
262 case 0:
263 add_url_alias(remote, xstrdup(s));
264 break;
265 case 1:
266 add_push_refspec(remote, xstrdup(s));
267 break;
268 case 2:
269 add_fetch_refspec(remote, xstrdup(s));
270 break;
271 }
272 }
273 fclose(f);
274 }
275
276 static void read_branches_file(struct remote *remote)
277 {
278 const char *slash = strchr(remote->name, '/');
279 char *frag;
280 struct strbuf branch = STRBUF_INIT;
281 int n = slash ? slash - remote->name : 1000;
282 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
283 char *s, *p;
284 int len;
285
286 if (!f)
287 return;
288 s = fgets(buffer, BUF_SIZE, f);
289 fclose(f);
290 if (!s)
291 return;
292 while (isspace(*s))
293 s++;
294 if (!*s)
295 return;
296 remote->origin = REMOTE_BRANCHES;
297 p = s + strlen(s);
298 while (isspace(p[-1]))
299 *--p = 0;
300 len = p - s;
301 if (slash)
302 len += strlen(slash);
303 p = xmalloc(len + 1);
304 strcpy(p, s);
305 if (slash)
306 strcat(p, slash);
307
308 /*
309 * With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
310 * reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
311 * the partial URL obtained from the branches file plus
312 * "/netdev-2.6" and does not store it in any tracking ref.
313 * #branch specifier in the file is ignored.
314 *
315 * Otherwise, the branches file would have URL and optionally
316 * #branch specified. The "master" (or specified) branch is
317 * fetched and stored in the local branch of the same name.
318 */
319 frag = strchr(p, '#');
320 if (frag) {
321 *(frag++) = '\0';
322 strbuf_addf(&branch, "refs/heads/%s", frag);
323 } else
324 strbuf_addstr(&branch, "refs/heads/master");
325 if (!slash) {
326 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
327 } else {
328 strbuf_reset(&branch);
329 strbuf_addstr(&branch, "HEAD:");
330 }
331 add_url_alias(remote, p);
332 add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
333 /*
334 * Cogito compatible push: push current HEAD to remote #branch
335 * (master if missing)
336 */
337 strbuf_init(&branch, 0);
338 strbuf_addstr(&branch, "HEAD");
339 if (frag)
340 strbuf_addf(&branch, ":refs/heads/%s", frag);
341 else
342 strbuf_addstr(&branch, ":refs/heads/master");
343 add_push_refspec(remote, strbuf_detach(&branch, NULL));
344 remote->fetch_tags = 1; /* always auto-follow */
345 }
346
347 static int handle_config(const char *key, const char *value, void *cb)
348 {
349 const char *name;
350 const char *subkey;
351 struct remote *remote;
352 struct branch *branch;
353 if (!prefixcmp(key, "branch.")) {
354 name = key + 7;
355 subkey = strrchr(name, '.');
356 if (!subkey)
357 return 0;
358 branch = make_branch(name, subkey - name);
359 if (!strcmp(subkey, ".remote")) {
360 if (!value)
361 return config_error_nonbool(key);
362 branch->remote_name = xstrdup(value);
363 if (branch == current_branch) {
364 default_remote_name = branch->remote_name;
365 explicit_default_remote_name = 1;
366 }
367 } else if (!strcmp(subkey, ".merge")) {
368 if (!value)
369 return config_error_nonbool(key);
370 add_merge(branch, xstrdup(value));
371 }
372 return 0;
373 }
374 if (!prefixcmp(key, "url.")) {
375 struct rewrite *rewrite;
376 name = key + 4;
377 subkey = strrchr(name, '.');
378 if (!subkey)
379 return 0;
380 if (!strcmp(subkey, ".insteadof")) {
381 rewrite = make_rewrite(&rewrites, name, subkey - name);
382 if (!value)
383 return config_error_nonbool(key);
384 add_instead_of(rewrite, xstrdup(value));
385 } else if (!strcmp(subkey, ".pushinsteadof")) {
386 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
387 if (!value)
388 return config_error_nonbool(key);
389 add_instead_of(rewrite, xstrdup(value));
390 }
391 }
392 if (prefixcmp(key, "remote."))
393 return 0;
394 name = key + 7;
395 if (*name == '/') {
396 warning("Config remote shorthand cannot begin with '/': %s",
397 name);
398 return 0;
399 }
400 subkey = strrchr(name, '.');
401 if (!subkey)
402 return 0;
403 remote = make_remote(name, subkey - name);
404 remote->origin = REMOTE_CONFIG;
405 if (!strcmp(subkey, ".mirror"))
406 remote->mirror = git_config_bool(key, value);
407 else if (!strcmp(subkey, ".skipdefaultupdate"))
408 remote->skip_default_update = git_config_bool(key, value);
409 else if (!strcmp(subkey, ".skipfetchall"))
410 remote->skip_default_update = git_config_bool(key, value);
411 else if (!strcmp(subkey, ".url")) {
412 const char *v;
413 if (git_config_string(&v, key, value))
414 return -1;
415 add_url(remote, v);
416 } else if (!strcmp(subkey, ".pushurl")) {
417 const char *v;
418 if (git_config_string(&v, key, value))
419 return -1;
420 add_pushurl(remote, v);
421 } else if (!strcmp(subkey, ".push")) {
422 const char *v;
423 if (git_config_string(&v, key, value))
424 return -1;
425 add_push_refspec(remote, v);
426 } else if (!strcmp(subkey, ".fetch")) {
427 const char *v;
428 if (git_config_string(&v, key, value))
429 return -1;
430 add_fetch_refspec(remote, v);
431 } else if (!strcmp(subkey, ".receivepack")) {
432 const char *v;
433 if (git_config_string(&v, key, value))
434 return -1;
435 if (!remote->receivepack)
436 remote->receivepack = v;
437 else
438 error("more than one receivepack given, using the first");
439 } else if (!strcmp(subkey, ".uploadpack")) {
440 const char *v;
441 if (git_config_string(&v, key, value))
442 return -1;
443 if (!remote->uploadpack)
444 remote->uploadpack = v;
445 else
446 error("more than one uploadpack given, using the first");
447 } else if (!strcmp(subkey, ".tagopt")) {
448 if (!strcmp(value, "--no-tags"))
449 remote->fetch_tags = -1;
450 else if (!strcmp(value, "--tags"))
451 remote->fetch_tags = 2;
452 } else if (!strcmp(subkey, ".proxy")) {
453 return git_config_string((const char **)&remote->http_proxy,
454 key, value);
455 } else if (!strcmp(subkey, ".vcs")) {
456 return git_config_string(&remote->foreign_vcs, key, value);
457 }
458 return 0;
459 }
460
461 static void alias_all_urls(void)
462 {
463 int i, j;
464 for (i = 0; i < remotes_nr; i++) {
465 int add_pushurl_aliases;
466 if (!remotes[i])
467 continue;
468 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
469 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
470 }
471 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
472 for (j = 0; j < remotes[i]->url_nr; j++) {
473 if (add_pushurl_aliases)
474 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
475 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
476 }
477 }
478 }
479
480 static void read_config(void)
481 {
482 unsigned char sha1[20];
483 const char *head_ref;
484 int flag;
485 if (default_remote_name) /* did this already */
486 return;
487 default_remote_name = xstrdup("origin");
488 current_branch = NULL;
489 head_ref = resolve_ref_unsafe("HEAD", sha1, 0, &flag);
490 if (head_ref && (flag & REF_ISSYMREF) &&
491 !prefixcmp(head_ref, "refs/heads/")) {
492 current_branch =
493 make_branch(head_ref + strlen("refs/heads/"), 0);
494 }
495 git_config(handle_config, NULL);
496 alias_all_urls();
497 }
498
499 /*
500 * This function frees a refspec array.
501 * Warning: code paths should be checked to ensure that the src
502 * and dst pointers are always freeable pointers as well
503 * as the refspec pointer itself.
504 */
505 static void free_refspecs(struct refspec *refspec, int nr_refspec)
506 {
507 int i;
508
509 if (!refspec)
510 return;
511
512 for (i = 0; i < nr_refspec; i++) {
513 free(refspec[i].src);
514 free(refspec[i].dst);
515 }
516 free(refspec);
517 }
518
519 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
520 {
521 int i;
522 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
523
524 for (i = 0; i < nr_refspec; i++) {
525 size_t llen;
526 int is_glob;
527 const char *lhs, *rhs;
528 int flags;
529
530 is_glob = 0;
531
532 lhs = refspec[i];
533 if (*lhs == '+') {
534 rs[i].force = 1;
535 lhs++;
536 }
537
538 rhs = strrchr(lhs, ':');
539
540 /*
541 * Before going on, special case ":" (or "+:") as a refspec
542 * for pushing matching refs.
543 */
544 if (!fetch && rhs == lhs && rhs[1] == '\0') {
545 rs[i].matching = 1;
546 continue;
547 }
548
549 if (rhs) {
550 size_t rlen = strlen(++rhs);
551 is_glob = (1 <= rlen && strchr(rhs, '*'));
552 rs[i].dst = xstrndup(rhs, rlen);
553 }
554
555 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
556 if (1 <= llen && memchr(lhs, '*', llen)) {
557 if ((rhs && !is_glob) || (!rhs && fetch))
558 goto invalid;
559 is_glob = 1;
560 } else if (rhs && is_glob) {
561 goto invalid;
562 }
563
564 rs[i].pattern = is_glob;
565 rs[i].src = xstrndup(lhs, llen);
566 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
567
568 if (fetch) {
569 unsigned char unused[40];
570
571 /* LHS */
572 if (!*rs[i].src)
573 ; /* empty is ok; it means "HEAD" */
574 else if (llen == 40 && !get_sha1_hex(rs[i].src, unused))
575 rs[i].exact_sha1 = 1; /* ok */
576 else if (!check_refname_format(rs[i].src, flags))
577 ; /* valid looking ref is ok */
578 else
579 goto invalid;
580 /* RHS */
581 if (!rs[i].dst)
582 ; /* missing is ok; it is the same as empty */
583 else if (!*rs[i].dst)
584 ; /* empty is ok; it means "do not store" */
585 else if (!check_refname_format(rs[i].dst, flags))
586 ; /* valid looking ref is ok */
587 else
588 goto invalid;
589 } else {
590 /*
591 * LHS
592 * - empty is allowed; it means delete.
593 * - when wildcarded, it must be a valid looking ref.
594 * - otherwise, it must be an extended SHA-1, but
595 * there is no existing way to validate this.
596 */
597 if (!*rs[i].src)
598 ; /* empty is ok */
599 else if (is_glob) {
600 if (check_refname_format(rs[i].src, flags))
601 goto invalid;
602 }
603 else
604 ; /* anything goes, for now */
605 /*
606 * RHS
607 * - missing is allowed, but LHS then must be a
608 * valid looking ref.
609 * - empty is not allowed.
610 * - otherwise it must be a valid looking ref.
611 */
612 if (!rs[i].dst) {
613 if (check_refname_format(rs[i].src, flags))
614 goto invalid;
615 } else if (!*rs[i].dst) {
616 goto invalid;
617 } else {
618 if (check_refname_format(rs[i].dst, flags))
619 goto invalid;
620 }
621 }
622 }
623 return rs;
624
625 invalid:
626 if (verify) {
627 /*
628 * nr_refspec must be greater than zero and i must be valid
629 * since it is only possible to reach this point from within
630 * the for loop above.
631 */
632 free_refspecs(rs, i+1);
633 return NULL;
634 }
635 die("Invalid refspec '%s'", refspec[i]);
636 }
637
638 int valid_fetch_refspec(const char *fetch_refspec_str)
639 {
640 struct refspec *refspec;
641
642 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
643 free_refspecs(refspec, 1);
644 return !!refspec;
645 }
646
647 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
648 {
649 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
650 }
651
652 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
653 {
654 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
655 }
656
657 void free_refspec(int nr_refspec, struct refspec *refspec)
658 {
659 int i;
660 for (i = 0; i < nr_refspec; i++) {
661 free(refspec[i].src);
662 free(refspec[i].dst);
663 }
664 free(refspec);
665 }
666
667 static int valid_remote_nick(const char *name)
668 {
669 if (!name[0] || is_dot_or_dotdot(name))
670 return 0;
671 return !strchr(name, '/'); /* no slash */
672 }
673
674 struct remote *remote_get(const char *name)
675 {
676 struct remote *ret;
677 int name_given = 0;
678
679 read_config();
680 if (name)
681 name_given = 1;
682 else {
683 name = default_remote_name;
684 name_given = explicit_default_remote_name;
685 }
686
687 ret = make_remote(name, 0);
688 if (valid_remote_nick(name)) {
689 if (!valid_remote(ret))
690 read_remotes_file(ret);
691 if (!valid_remote(ret))
692 read_branches_file(ret);
693 }
694 if (name_given && !valid_remote(ret))
695 add_url_alias(ret, name);
696 if (!valid_remote(ret))
697 return NULL;
698 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
699 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
700 return ret;
701 }
702
703 int remote_is_configured(const char *name)
704 {
705 int i;
706 read_config();
707
708 for (i = 0; i < remotes_nr; i++)
709 if (!strcmp(name, remotes[i]->name))
710 return 1;
711 return 0;
712 }
713
714 int for_each_remote(each_remote_fn fn, void *priv)
715 {
716 int i, result = 0;
717 read_config();
718 for (i = 0; i < remotes_nr && !result; i++) {
719 struct remote *r = remotes[i];
720 if (!r)
721 continue;
722 if (!r->fetch)
723 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
724 r->fetch_refspec);
725 if (!r->push)
726 r->push = parse_push_refspec(r->push_refspec_nr,
727 r->push_refspec);
728 result = fn(r, priv);
729 }
730 return result;
731 }
732
733 void ref_remove_duplicates(struct ref *ref_map)
734 {
735 struct string_list refs = STRING_LIST_INIT_NODUP;
736 struct string_list_item *item = NULL;
737 struct ref *prev = NULL, *next = NULL;
738 for (; ref_map; prev = ref_map, ref_map = next) {
739 next = ref_map->next;
740 if (!ref_map->peer_ref)
741 continue;
742
743 item = string_list_lookup(&refs, ref_map->peer_ref->name);
744 if (item) {
745 if (strcmp(((struct ref *)item->util)->name,
746 ref_map->name))
747 die("%s tracks both %s and %s",
748 ref_map->peer_ref->name,
749 ((struct ref *)item->util)->name,
750 ref_map->name);
751 prev->next = ref_map->next;
752 free(ref_map->peer_ref);
753 free(ref_map);
754 ref_map = prev; /* skip this; we freed it */
755 continue;
756 }
757
758 item = string_list_insert(&refs, ref_map->peer_ref->name);
759 item->util = ref_map;
760 }
761 string_list_clear(&refs, 0);
762 }
763
764 int remote_has_url(struct remote *remote, const char *url)
765 {
766 int i;
767 for (i = 0; i < remote->url_nr; i++) {
768 if (!strcmp(remote->url[i], url))
769 return 1;
770 }
771 return 0;
772 }
773
774 static int match_name_with_pattern(const char *key, const char *name,
775 const char *value, char **result)
776 {
777 const char *kstar = strchr(key, '*');
778 size_t klen;
779 size_t ksuffixlen;
780 size_t namelen;
781 int ret;
782 if (!kstar)
783 die("Key '%s' of pattern had no '*'", key);
784 klen = kstar - key;
785 ksuffixlen = strlen(kstar + 1);
786 namelen = strlen(name);
787 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
788 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
789 if (ret && value) {
790 const char *vstar = strchr(value, '*');
791 size_t vlen;
792 size_t vsuffixlen;
793 if (!vstar)
794 die("Value '%s' of pattern has no '*'", value);
795 vlen = vstar - value;
796 vsuffixlen = strlen(vstar + 1);
797 *result = xmalloc(vlen + vsuffixlen +
798 strlen(name) -
799 klen - ksuffixlen + 1);
800 strncpy(*result, value, vlen);
801 strncpy(*result + vlen,
802 name + klen, namelen - klen - ksuffixlen);
803 strcpy(*result + vlen + namelen - klen - ksuffixlen,
804 vstar + 1);
805 }
806 return ret;
807 }
808
809 static int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
810 {
811 int i;
812 int find_src = !query->src;
813
814 if (find_src && !query->dst)
815 return error("query_refspecs: need either src or dst");
816
817 for (i = 0; i < ref_count; i++) {
818 struct refspec *refspec = &refs[i];
819 const char *key = find_src ? refspec->dst : refspec->src;
820 const char *value = find_src ? refspec->src : refspec->dst;
821 const char *needle = find_src ? query->dst : query->src;
822 char **result = find_src ? &query->src : &query->dst;
823
824 if (!refspec->dst)
825 continue;
826 if (refspec->pattern) {
827 if (match_name_with_pattern(key, needle, value, result)) {
828 query->force = refspec->force;
829 return 0;
830 }
831 } else if (!strcmp(needle, key)) {
832 *result = xstrdup(value);
833 query->force = refspec->force;
834 return 0;
835 }
836 }
837 return -1;
838 }
839
840 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
841 const char *name)
842 {
843 struct refspec query;
844
845 memset(&query, 0, sizeof(struct refspec));
846 query.src = (char *)name;
847
848 if (query_refspecs(refspecs, nr_refspec, &query))
849 return NULL;
850
851 return query.dst;
852 }
853
854 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
855 {
856 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
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 int ref_compare_name(const void *va, const void *vb)
923 {
924 const struct ref *a = va, *b = vb;
925 return strcmp(a->name, b->name);
926 }
927
928 static void *ref_list_get_next(const void *a)
929 {
930 return ((const struct ref *)a)->next;
931 }
932
933 static void ref_list_set_next(void *a, void *next)
934 {
935 ((struct ref *)a)->next = next;
936 }
937
938 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
939 {
940 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
941 }
942
943 static int count_refspec_match(const char *pattern,
944 struct ref *refs,
945 struct ref **matched_ref)
946 {
947 int patlen = strlen(pattern);
948 struct ref *matched_weak = NULL;
949 struct ref *matched = NULL;
950 int weak_match = 0;
951 int match = 0;
952
953 for (weak_match = match = 0; refs; refs = refs->next) {
954 char *name = refs->name;
955 int namelen = strlen(name);
956
957 if (!refname_match(pattern, name, ref_rev_parse_rules))
958 continue;
959
960 /* A match is "weak" if it is with refs outside
961 * heads or tags, and did not specify the pattern
962 * in full (e.g. "refs/remotes/origin/master") or at
963 * least from the toplevel (e.g. "remotes/origin/master");
964 * otherwise "git push $URL master" would result in
965 * ambiguity between remotes/origin/master and heads/master
966 * at the remote site.
967 */
968 if (namelen != patlen &&
969 patlen != namelen - 5 &&
970 prefixcmp(name, "refs/heads/") &&
971 prefixcmp(name, "refs/tags/")) {
972 /* We want to catch the case where only weak
973 * matches are found and there are multiple
974 * matches, and where more than one strong
975 * matches are found, as ambiguous. One
976 * strong match with zero or more weak matches
977 * are acceptable as a unique match.
978 */
979 matched_weak = refs;
980 weak_match++;
981 }
982 else {
983 matched = refs;
984 match++;
985 }
986 }
987 if (!matched) {
988 *matched_ref = matched_weak;
989 return weak_match;
990 }
991 else {
992 *matched_ref = matched;
993 return match;
994 }
995 }
996
997 static void tail_link_ref(struct ref *ref, struct ref ***tail)
998 {
999 **tail = ref;
1000 while (ref->next)
1001 ref = ref->next;
1002 *tail = &ref->next;
1003 }
1004
1005 static struct ref *alloc_delete_ref(void)
1006 {
1007 struct ref *ref = alloc_ref("(delete)");
1008 hashclr(ref->new_sha1);
1009 return ref;
1010 }
1011
1012 static struct ref *try_explicit_object_name(const char *name)
1013 {
1014 unsigned char sha1[20];
1015 struct ref *ref;
1016
1017 if (!*name)
1018 return alloc_delete_ref();
1019 if (get_sha1(name, sha1))
1020 return NULL;
1021 ref = alloc_ref(name);
1022 hashcpy(ref->new_sha1, sha1);
1023 return ref;
1024 }
1025
1026 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1027 {
1028 struct ref *ret = alloc_ref(name);
1029 tail_link_ref(ret, tail);
1030 return ret;
1031 }
1032
1033 static char *guess_ref(const char *name, struct ref *peer)
1034 {
1035 struct strbuf buf = STRBUF_INIT;
1036 unsigned char sha1[20];
1037
1038 const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
1039 if (!r)
1040 return NULL;
1041
1042 if (!prefixcmp(r, "refs/heads/"))
1043 strbuf_addstr(&buf, "refs/heads/");
1044 else if (!prefixcmp(r, "refs/tags/"))
1045 strbuf_addstr(&buf, "refs/tags/");
1046 else
1047 return NULL;
1048
1049 strbuf_addstr(&buf, name);
1050 return strbuf_detach(&buf, NULL);
1051 }
1052
1053 static int match_explicit(struct ref *src, struct ref *dst,
1054 struct ref ***dst_tail,
1055 struct refspec *rs)
1056 {
1057 struct ref *matched_src, *matched_dst;
1058 int copy_src;
1059
1060 const char *dst_value = rs->dst;
1061 char *dst_guess;
1062
1063 if (rs->pattern || rs->matching)
1064 return 0;
1065
1066 matched_src = matched_dst = NULL;
1067 switch (count_refspec_match(rs->src, src, &matched_src)) {
1068 case 1:
1069 copy_src = 1;
1070 break;
1071 case 0:
1072 /* The source could be in the get_sha1() format
1073 * not a reference name. :refs/other is a
1074 * way to delete 'other' ref at the remote end.
1075 */
1076 matched_src = try_explicit_object_name(rs->src);
1077 if (!matched_src)
1078 return error("src refspec %s does not match any.", rs->src);
1079 copy_src = 0;
1080 break;
1081 default:
1082 return error("src refspec %s matches more than one.", rs->src);
1083 }
1084
1085 if (!dst_value) {
1086 unsigned char sha1[20];
1087 int flag;
1088
1089 dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
1090 if (!dst_value ||
1091 ((flag & REF_ISSYMREF) &&
1092 prefixcmp(dst_value, "refs/heads/")))
1093 die("%s cannot be resolved to branch.",
1094 matched_src->name);
1095 }
1096
1097 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1098 case 1:
1099 break;
1100 case 0:
1101 if (!memcmp(dst_value, "refs/", 5))
1102 matched_dst = make_linked_ref(dst_value, dst_tail);
1103 else if (is_null_sha1(matched_src->new_sha1))
1104 error("unable to delete '%s': remote ref does not exist",
1105 dst_value);
1106 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1107 matched_dst = make_linked_ref(dst_guess, dst_tail);
1108 else
1109 error("unable to push to unqualified destination: %s\n"
1110 "The destination refspec neither matches an "
1111 "existing ref on the remote nor\n"
1112 "begins with refs/, and we are unable to "
1113 "guess a prefix based on the source ref.",
1114 dst_value);
1115 break;
1116 default:
1117 matched_dst = NULL;
1118 error("dst refspec %s matches more than one.",
1119 dst_value);
1120 break;
1121 }
1122 if (!matched_dst)
1123 return -1;
1124 if (matched_dst->peer_ref)
1125 return error("dst ref %s receives from more than one src.",
1126 matched_dst->name);
1127 else {
1128 matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1129 matched_dst->force = rs->force;
1130 }
1131 return 0;
1132 }
1133
1134 static int match_explicit_refs(struct ref *src, struct ref *dst,
1135 struct ref ***dst_tail, struct refspec *rs,
1136 int rs_nr)
1137 {
1138 int i, errs;
1139 for (i = errs = 0; i < rs_nr; i++)
1140 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1141 return errs;
1142 }
1143
1144 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1145 int send_mirror, int direction, const struct refspec **ret_pat)
1146 {
1147 const struct refspec *pat;
1148 char *name;
1149 int i;
1150 int matching_refs = -1;
1151 for (i = 0; i < rs_nr; i++) {
1152 if (rs[i].matching &&
1153 (matching_refs == -1 || rs[i].force)) {
1154 matching_refs = i;
1155 continue;
1156 }
1157
1158 if (rs[i].pattern) {
1159 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1160 int match;
1161 if (direction == FROM_SRC)
1162 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1163 else
1164 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1165 if (match) {
1166 matching_refs = i;
1167 break;
1168 }
1169 }
1170 }
1171 if (matching_refs == -1)
1172 return NULL;
1173
1174 pat = rs + matching_refs;
1175 if (pat->matching) {
1176 /*
1177 * "matching refs"; traditionally we pushed everything
1178 * including refs outside refs/heads/ hierarchy, but
1179 * that does not make much sense these days.
1180 */
1181 if (!send_mirror && prefixcmp(ref->name, "refs/heads/"))
1182 return NULL;
1183 name = xstrdup(ref->name);
1184 }
1185 if (ret_pat)
1186 *ret_pat = pat;
1187 return name;
1188 }
1189
1190 static struct ref **tail_ref(struct ref **head)
1191 {
1192 struct ref **tail = head;
1193 while (*tail)
1194 tail = &((*tail)->next);
1195 return tail;
1196 }
1197
1198 struct tips {
1199 struct commit **tip;
1200 int nr, alloc;
1201 };
1202
1203 static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1204 {
1205 struct commit *commit;
1206
1207 if (is_null_sha1(sha1))
1208 return;
1209 commit = lookup_commit_reference_gently(sha1, 1);
1210 if (!commit || (commit->object.flags & TMP_MARK))
1211 return;
1212 commit->object.flags |= TMP_MARK;
1213 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1214 tips->tip[tips->nr++] = commit;
1215 }
1216
1217 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1218 {
1219 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1220 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1221 struct string_list_item *item;
1222 struct ref *ref;
1223 struct tips sent_tips;
1224
1225 /*
1226 * Collect everything we know they would have at the end of
1227 * this push, and collect all tags they have.
1228 */
1229 memset(&sent_tips, 0, sizeof(sent_tips));
1230 for (ref = *dst; ref; ref = ref->next) {
1231 if (ref->peer_ref &&
1232 !is_null_sha1(ref->peer_ref->new_sha1))
1233 add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1234 else
1235 add_to_tips(&sent_tips, ref->old_sha1);
1236 if (!prefixcmp(ref->name, "refs/tags/"))
1237 string_list_append(&dst_tag, ref->name);
1238 }
1239 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1240
1241 sort_string_list(&dst_tag);
1242
1243 /* Collect tags they do not have. */
1244 for (ref = src; ref; ref = ref->next) {
1245 if (prefixcmp(ref->name, "refs/tags/"))
1246 continue; /* not a tag */
1247 if (string_list_has_string(&dst_tag, ref->name))
1248 continue; /* they already have it */
1249 if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1250 continue; /* be conservative */
1251 item = string_list_append(&src_tag, ref->name);
1252 item->util = ref;
1253 }
1254 string_list_clear(&dst_tag, 0);
1255
1256 /*
1257 * At this point, src_tag lists tags that are missing from
1258 * dst, and sent_tips lists the tips we are pushing or those
1259 * that we know they already have. An element in the src_tag
1260 * that is an ancestor of any of the sent_tips needs to be
1261 * sent to the other side.
1262 */
1263 if (sent_tips.nr) {
1264 for_each_string_list_item(item, &src_tag) {
1265 struct ref *ref = item->util;
1266 struct ref *dst_ref;
1267 struct commit *commit;
1268
1269 if (is_null_sha1(ref->new_sha1))
1270 continue;
1271 commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1272 if (!commit)
1273 /* not pushing a commit, which is not an error */
1274 continue;
1275
1276 /*
1277 * Is this tag, which they do not have, reachable from
1278 * any of the commits we are sending?
1279 */
1280 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1281 continue;
1282
1283 /* Add it in */
1284 dst_ref = make_linked_ref(ref->name, dst_tail);
1285 hashcpy(dst_ref->new_sha1, ref->new_sha1);
1286 dst_ref->peer_ref = copy_ref(ref);
1287 }
1288 }
1289 string_list_clear(&src_tag, 0);
1290 free(sent_tips.tip);
1291 }
1292
1293 /*
1294 * Given the set of refs the local repository has, the set of refs the
1295 * remote repository has, and the refspec used for push, determine
1296 * what remote refs we will update and with what value by setting
1297 * peer_ref (which object is being pushed) and force (if the push is
1298 * forced) in elements of "dst". The function may add new elements to
1299 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1300 */
1301 int match_push_refs(struct ref *src, struct ref **dst,
1302 int nr_refspec, const char **refspec, int flags)
1303 {
1304 struct refspec *rs;
1305 int send_all = flags & MATCH_REFS_ALL;
1306 int send_mirror = flags & MATCH_REFS_MIRROR;
1307 int send_prune = flags & MATCH_REFS_PRUNE;
1308 int errs;
1309 static const char *default_refspec[] = { ":", NULL };
1310 struct ref *ref, **dst_tail = tail_ref(dst);
1311
1312 if (!nr_refspec) {
1313 nr_refspec = 1;
1314 refspec = default_refspec;
1315 }
1316 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1317 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1318
1319 /* pick the remainder */
1320 for (ref = src; ref; ref = ref->next) {
1321 struct ref *dst_peer;
1322 const struct refspec *pat = NULL;
1323 char *dst_name;
1324
1325 if (ref->peer_ref)
1326 continue;
1327
1328 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1329 if (!dst_name)
1330 continue;
1331
1332 dst_peer = find_ref_by_name(*dst, dst_name);
1333 if (dst_peer) {
1334 if (dst_peer->peer_ref)
1335 /* We're already sending something to this ref. */
1336 goto free_name;
1337 } else {
1338 if (pat->matching && !(send_all || send_mirror))
1339 /*
1340 * Remote doesn't have it, and we have no
1341 * explicit pattern, and we don't have
1342 * --all nor --mirror.
1343 */
1344 goto free_name;
1345
1346 /* Create a new one and link it */
1347 dst_peer = make_linked_ref(dst_name, &dst_tail);
1348 hashcpy(dst_peer->new_sha1, ref->new_sha1);
1349 }
1350 dst_peer->peer_ref = copy_ref(ref);
1351 dst_peer->force = pat->force;
1352 free_name:
1353 free(dst_name);
1354 }
1355
1356 if (flags & MATCH_REFS_FOLLOW_TAGS)
1357 add_missing_tags(src, dst, &dst_tail);
1358
1359 if (send_prune) {
1360 /* check for missing refs on the remote */
1361 for (ref = *dst; ref; ref = ref->next) {
1362 char *src_name;
1363
1364 if (ref->peer_ref)
1365 /* We're already sending something to this ref. */
1366 continue;
1367
1368 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1369 if (src_name) {
1370 if (!find_ref_by_name(src, src_name))
1371 ref->peer_ref = alloc_delete_ref();
1372 free(src_name);
1373 }
1374 }
1375 }
1376 if (errs)
1377 return -1;
1378 return 0;
1379 }
1380
1381 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1382 int force_update)
1383 {
1384 struct ref *ref;
1385
1386 for (ref = remote_refs; ref; ref = ref->next) {
1387 int force_ref_update = ref->force || force_update;
1388
1389 if (ref->peer_ref)
1390 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1391 else if (!send_mirror)
1392 continue;
1393
1394 ref->deletion = is_null_sha1(ref->new_sha1);
1395 if (!ref->deletion &&
1396 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1397 ref->status = REF_STATUS_UPTODATE;
1398 continue;
1399 }
1400
1401 /*
1402 * Decide whether an individual refspec A:B can be
1403 * pushed. The push will succeed if any of the
1404 * following are true:
1405 *
1406 * (1) the remote reference B does not exist
1407 *
1408 * (2) the remote reference B is being removed (i.e.,
1409 * pushing :B where no source is specified)
1410 *
1411 * (3) the destination is not under refs/tags/, and
1412 * if the old and new value is a commit, the new
1413 * is a descendant of the old.
1414 *
1415 * (4) it is forced using the +A:B notation, or by
1416 * passing the --force argument
1417 */
1418
1419 if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
1420 int why = 0; /* why would this push require --force? */
1421
1422 if (!prefixcmp(ref->name, "refs/tags/"))
1423 why = REF_STATUS_REJECT_ALREADY_EXISTS;
1424 else if (!has_sha1_file(ref->old_sha1))
1425 why = REF_STATUS_REJECT_FETCH_FIRST;
1426 else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1427 !lookup_commit_reference_gently(ref->new_sha1, 1))
1428 why = REF_STATUS_REJECT_NEEDS_FORCE;
1429 else if (!ref_newer(ref->new_sha1, ref->old_sha1))
1430 why = REF_STATUS_REJECT_NONFASTFORWARD;
1431
1432 if (!force_ref_update)
1433 ref->status = why;
1434 else if (why)
1435 ref->forced_update = 1;
1436 }
1437 }
1438 }
1439
1440 struct branch *branch_get(const char *name)
1441 {
1442 struct branch *ret;
1443
1444 read_config();
1445 if (!name || !*name || !strcmp(name, "HEAD"))
1446 ret = current_branch;
1447 else
1448 ret = make_branch(name, 0);
1449 if (ret && ret->remote_name) {
1450 ret->remote = remote_get(ret->remote_name);
1451 if (ret->merge_nr) {
1452 int i;
1453 ret->merge = xcalloc(sizeof(*ret->merge),
1454 ret->merge_nr);
1455 for (i = 0; i < ret->merge_nr; i++) {
1456 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1457 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1458 if (remote_find_tracking(ret->remote, ret->merge[i])
1459 && !strcmp(ret->remote_name, "."))
1460 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1461 }
1462 }
1463 }
1464 return ret;
1465 }
1466
1467 int branch_has_merge_config(struct branch *branch)
1468 {
1469 return branch && !!branch->merge;
1470 }
1471
1472 int branch_merge_matches(struct branch *branch,
1473 int i,
1474 const char *refname)
1475 {
1476 if (!branch || i < 0 || i >= branch->merge_nr)
1477 return 0;
1478 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1479 }
1480
1481 static int ignore_symref_update(const char *refname)
1482 {
1483 unsigned char sha1[20];
1484 int flag;
1485
1486 if (!resolve_ref_unsafe(refname, sha1, 0, &flag))
1487 return 0; /* non-existing refs are OK */
1488 return (flag & REF_ISSYMREF);
1489 }
1490
1491 static struct ref *get_expanded_map(const struct ref *remote_refs,
1492 const struct refspec *refspec)
1493 {
1494 const struct ref *ref;
1495 struct ref *ret = NULL;
1496 struct ref **tail = &ret;
1497
1498 char *expn_name;
1499
1500 for (ref = remote_refs; ref; ref = ref->next) {
1501 if (strchr(ref->name, '^'))
1502 continue; /* a dereference item */
1503 if (match_name_with_pattern(refspec->src, ref->name,
1504 refspec->dst, &expn_name) &&
1505 !ignore_symref_update(expn_name)) {
1506 struct ref *cpy = copy_ref(ref);
1507
1508 cpy->peer_ref = alloc_ref(expn_name);
1509 free(expn_name);
1510 if (refspec->force)
1511 cpy->peer_ref->force = 1;
1512 *tail = cpy;
1513 tail = &cpy->next;
1514 }
1515 }
1516
1517 return ret;
1518 }
1519
1520 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1521 {
1522 const struct ref *ref;
1523 for (ref = refs; ref; ref = ref->next) {
1524 if (refname_match(name, ref->name, ref_fetch_rules))
1525 return ref;
1526 }
1527 return NULL;
1528 }
1529
1530 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1531 {
1532 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1533
1534 if (!ref)
1535 return NULL;
1536
1537 return copy_ref(ref);
1538 }
1539
1540 static struct ref *get_local_ref(const char *name)
1541 {
1542 if (!name || name[0] == '\0')
1543 return NULL;
1544
1545 if (!prefixcmp(name, "refs/"))
1546 return alloc_ref(name);
1547
1548 if (!prefixcmp(name, "heads/") ||
1549 !prefixcmp(name, "tags/") ||
1550 !prefixcmp(name, "remotes/"))
1551 return alloc_ref_with_prefix("refs/", 5, name);
1552
1553 return alloc_ref_with_prefix("refs/heads/", 11, name);
1554 }
1555
1556 int get_fetch_map(const struct ref *remote_refs,
1557 const struct refspec *refspec,
1558 struct ref ***tail,
1559 int missing_ok)
1560 {
1561 struct ref *ref_map, **rmp;
1562
1563 if (refspec->pattern) {
1564 ref_map = get_expanded_map(remote_refs, refspec);
1565 } else {
1566 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1567
1568 if (refspec->exact_sha1) {
1569 ref_map = alloc_ref(name);
1570 get_sha1_hex(name, ref_map->old_sha1);
1571 } else {
1572 ref_map = get_remote_ref(remote_refs, name);
1573 }
1574 if (!missing_ok && !ref_map)
1575 die("Couldn't find remote ref %s", name);
1576 if (ref_map) {
1577 ref_map->peer_ref = get_local_ref(refspec->dst);
1578 if (ref_map->peer_ref && refspec->force)
1579 ref_map->peer_ref->force = 1;
1580 }
1581 }
1582
1583 for (rmp = &ref_map; *rmp; ) {
1584 if ((*rmp)->peer_ref) {
1585 if (prefixcmp((*rmp)->peer_ref->name, "refs/") ||
1586 check_refname_format((*rmp)->peer_ref->name, 0)) {
1587 struct ref *ignore = *rmp;
1588 error("* Ignoring funny ref '%s' locally",
1589 (*rmp)->peer_ref->name);
1590 *rmp = (*rmp)->next;
1591 free(ignore->peer_ref);
1592 free(ignore);
1593 continue;
1594 }
1595 }
1596 rmp = &((*rmp)->next);
1597 }
1598
1599 if (ref_map)
1600 tail_link_ref(ref_map, tail);
1601
1602 return 0;
1603 }
1604
1605 int resolve_remote_symref(struct ref *ref, struct ref *list)
1606 {
1607 if (!ref->symref)
1608 return 0;
1609 for (; list; list = list->next)
1610 if (!strcmp(ref->symref, list->name)) {
1611 hashcpy(ref->old_sha1, list->old_sha1);
1612 return 0;
1613 }
1614 return 1;
1615 }
1616
1617 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1618 {
1619 while (list) {
1620 struct commit_list *temp = list;
1621 temp->item->object.flags &= ~mark;
1622 list = temp->next;
1623 free(temp);
1624 }
1625 }
1626
1627 int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1628 {
1629 struct object *o;
1630 struct commit *old, *new;
1631 struct commit_list *list, *used;
1632 int found = 0;
1633
1634 /*
1635 * Both new and old must be commit-ish and new is descendant of
1636 * old. Otherwise we require --force.
1637 */
1638 o = deref_tag(parse_object(old_sha1), NULL, 0);
1639 if (!o || o->type != OBJ_COMMIT)
1640 return 0;
1641 old = (struct commit *) o;
1642
1643 o = deref_tag(parse_object(new_sha1), NULL, 0);
1644 if (!o || o->type != OBJ_COMMIT)
1645 return 0;
1646 new = (struct commit *) o;
1647
1648 if (parse_commit(new) < 0)
1649 return 0;
1650
1651 used = list = NULL;
1652 commit_list_insert(new, &list);
1653 while (list) {
1654 new = pop_most_recent_commit(&list, TMP_MARK);
1655 commit_list_insert(new, &used);
1656 if (new == old) {
1657 found = 1;
1658 break;
1659 }
1660 }
1661 unmark_and_free(list, TMP_MARK);
1662 unmark_and_free(used, TMP_MARK);
1663 return found;
1664 }
1665
1666 /*
1667 * Return true if there is anything to report, otherwise false.
1668 */
1669 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1670 {
1671 unsigned char sha1[20];
1672 struct commit *ours, *theirs;
1673 char symmetric[84];
1674 struct rev_info revs;
1675 const char *rev_argv[10], *base;
1676 int rev_argc;
1677
1678 /*
1679 * Nothing to report unless we are marked to build on top of
1680 * somebody else.
1681 */
1682 if (!branch ||
1683 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1684 return 0;
1685
1686 /*
1687 * If what we used to build on no longer exists, there is
1688 * nothing to report.
1689 */
1690 base = branch->merge[0]->dst;
1691 if (read_ref(base, sha1))
1692 return 0;
1693 theirs = lookup_commit_reference(sha1);
1694 if (!theirs)
1695 return 0;
1696
1697 if (read_ref(branch->refname, sha1))
1698 return 0;
1699 ours = lookup_commit_reference(sha1);
1700 if (!ours)
1701 return 0;
1702
1703 /* are we the same? */
1704 if (theirs == ours)
1705 return 0;
1706
1707 /* Run "rev-list --left-right ours...theirs" internally... */
1708 rev_argc = 0;
1709 rev_argv[rev_argc++] = NULL;
1710 rev_argv[rev_argc++] = "--left-right";
1711 rev_argv[rev_argc++] = symmetric;
1712 rev_argv[rev_argc++] = "--";
1713 rev_argv[rev_argc] = NULL;
1714
1715 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1716 strcpy(symmetric + 40, "...");
1717 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1718
1719 init_revisions(&revs, NULL);
1720 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1721 prepare_revision_walk(&revs);
1722
1723 /* ... and count the commits on each side. */
1724 *num_ours = 0;
1725 *num_theirs = 0;
1726 while (1) {
1727 struct commit *c = get_revision(&revs);
1728 if (!c)
1729 break;
1730 if (c->object.flags & SYMMETRIC_LEFT)
1731 (*num_ours)++;
1732 else
1733 (*num_theirs)++;
1734 }
1735
1736 /* clear object flags smudged by the above traversal */
1737 clear_commit_marks(ours, ALL_REV_FLAGS);
1738 clear_commit_marks(theirs, ALL_REV_FLAGS);
1739 return 1;
1740 }
1741
1742 /*
1743 * Return true when there is anything to report, otherwise false.
1744 */
1745 int format_tracking_info(struct branch *branch, struct strbuf *sb)
1746 {
1747 int num_ours, num_theirs;
1748 const char *base;
1749
1750 if (!stat_tracking_info(branch, &num_ours, &num_theirs))
1751 return 0;
1752
1753 base = branch->merge[0]->dst;
1754 base = shorten_unambiguous_ref(base, 0);
1755 if (!num_theirs) {
1756 strbuf_addf(sb,
1757 Q_("Your branch is ahead of '%s' by %d commit.\n",
1758 "Your branch is ahead of '%s' by %d commits.\n",
1759 num_ours),
1760 base, num_ours);
1761 if (advice_status_hints)
1762 strbuf_addf(sb,
1763 _(" (use \"git push\" to publish your local commits)\n"));
1764 } else if (!num_ours) {
1765 strbuf_addf(sb,
1766 Q_("Your branch is behind '%s' by %d commit, "
1767 "and can be fast-forwarded.\n",
1768 "Your branch is behind '%s' by %d commits, "
1769 "and can be fast-forwarded.\n",
1770 num_theirs),
1771 base, num_theirs);
1772 if (advice_status_hints)
1773 strbuf_addf(sb,
1774 _(" (use \"git pull\" to update your local branch)\n"));
1775 } else {
1776 strbuf_addf(sb,
1777 Q_("Your branch and '%s' have diverged,\n"
1778 "and have %d and %d different commit each, "
1779 "respectively.\n",
1780 "Your branch and '%s' have diverged,\n"
1781 "and have %d and %d different commits each, "
1782 "respectively.\n",
1783 num_theirs),
1784 base, num_ours, num_theirs);
1785 if (advice_status_hints)
1786 strbuf_addf(sb,
1787 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
1788 }
1789 return 1;
1790 }
1791
1792 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1793 {
1794 struct ref ***local_tail = cb_data;
1795 struct ref *ref;
1796 int len;
1797
1798 /* we already know it starts with refs/ to get here */
1799 if (check_refname_format(refname + 5, 0))
1800 return 0;
1801
1802 len = strlen(refname) + 1;
1803 ref = xcalloc(1, sizeof(*ref) + len);
1804 hashcpy(ref->new_sha1, sha1);
1805 memcpy(ref->name, refname, len);
1806 **local_tail = ref;
1807 *local_tail = &ref->next;
1808 return 0;
1809 }
1810
1811 struct ref *get_local_heads(void)
1812 {
1813 struct ref *local_refs = NULL, **local_tail = &local_refs;
1814 for_each_ref(one_local_ref, &local_tail);
1815 return local_refs;
1816 }
1817
1818 struct ref *guess_remote_head(const struct ref *head,
1819 const struct ref *refs,
1820 int all)
1821 {
1822 const struct ref *r;
1823 struct ref *list = NULL;
1824 struct ref **tail = &list;
1825
1826 if (!head)
1827 return NULL;
1828
1829 /*
1830 * Some transports support directly peeking at
1831 * where HEAD points; if that is the case, then
1832 * we don't have to guess.
1833 */
1834 if (head->symref)
1835 return copy_ref(find_ref_by_name(refs, head->symref));
1836
1837 /* If refs/heads/master could be right, it is. */
1838 if (!all) {
1839 r = find_ref_by_name(refs, "refs/heads/master");
1840 if (r && !hashcmp(r->old_sha1, head->old_sha1))
1841 return copy_ref(r);
1842 }
1843
1844 /* Look for another ref that points there */
1845 for (r = refs; r; r = r->next) {
1846 if (r != head &&
1847 !prefixcmp(r->name, "refs/heads/") &&
1848 !hashcmp(r->old_sha1, head->old_sha1)) {
1849 *tail = copy_ref(r);
1850 tail = &((*tail)->next);
1851 if (!all)
1852 break;
1853 }
1854 }
1855
1856 return list;
1857 }
1858
1859 struct stale_heads_info {
1860 struct string_list *ref_names;
1861 struct ref **stale_refs_tail;
1862 struct refspec *refs;
1863 int ref_count;
1864 };
1865
1866 static int get_stale_heads_cb(const char *refname,
1867 const unsigned char *sha1, int flags, void *cb_data)
1868 {
1869 struct stale_heads_info *info = cb_data;
1870 struct refspec query;
1871 memset(&query, 0, sizeof(struct refspec));
1872 query.dst = (char *)refname;
1873
1874 if (query_refspecs(info->refs, info->ref_count, &query))
1875 return 0; /* No matches */
1876
1877 /*
1878 * If we did find a suitable refspec and it's not a symref and
1879 * it's not in the list of refs that currently exist in that
1880 * remote we consider it to be stale.
1881 */
1882 if (!((flags & REF_ISSYMREF) ||
1883 string_list_has_string(info->ref_names, query.src))) {
1884 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
1885 hashcpy(ref->new_sha1, sha1);
1886 }
1887
1888 free(query.src);
1889 return 0;
1890 }
1891
1892 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
1893 {
1894 struct ref *ref, *stale_refs = NULL;
1895 struct string_list ref_names = STRING_LIST_INIT_NODUP;
1896 struct stale_heads_info info;
1897 info.ref_names = &ref_names;
1898 info.stale_refs_tail = &stale_refs;
1899 info.refs = refs;
1900 info.ref_count = ref_count;
1901 for (ref = fetch_map; ref; ref = ref->next)
1902 string_list_append(&ref_names, ref->name);
1903 sort_string_list(&ref_names);
1904 for_each_ref(get_stale_heads_cb, &info);
1905 string_list_clear(&ref_names, 0);
1906 return stale_refs;
1907 }
git with Jakub Narębski modifications