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completion: complete format.coverLetter
[git/jrn.git] / remote.c
bloba89efab5b766ba9374c3a09656b2d56593884c8e
1 #include "cache.h"
2 #include "remote.h"
3 #include "refs.h"
4 #include "commit.h"
5 #include "diff.h"
6 #include "revision.h"
7 #include "dir.h"
8 #include "tag.h"
9 #include "string-list.h"
10 #include "mergesort.h"
11
12 enum map_direction { FROM_SRC, FROM_DST };
13
14 static struct refspec s_tag_refspec = {
15 0,
16 1,
17 0,
18 0,
19 "refs/tags/*",
20 "refs/tags/*"
21 };
22
23 const struct refspec *tag_refspec = &s_tag_refspec;
24
25 struct counted_string {
26 size_t len;
27 const char *s;
28 };
29 struct rewrite {
30 const char *base;
31 size_t baselen;
32 struct counted_string *instead_of;
33 int instead_of_nr;
34 int instead_of_alloc;
35 };
36 struct rewrites {
37 struct rewrite **rewrite;
38 int rewrite_alloc;
39 int rewrite_nr;
40 };
41
42 static struct remote **remotes;
43 static int remotes_alloc;
44 static int remotes_nr;
45
46 static struct branch **branches;
47 static int branches_alloc;
48 static int branches_nr;
49
50 static struct branch *current_branch;
51 static const char *default_remote_name;
52 static const char *pushremote_name;
53 static int explicit_default_remote_name;
54
55 static struct rewrites rewrites;
56 static struct rewrites rewrites_push;
57
58 #define BUF_SIZE (2048)
59 static char buffer[BUF_SIZE];
60
61 static int valid_remote(const struct remote *remote)
62 {
63 return (!!remote->url) || (!!remote->foreign_vcs);
64 }
65
66 static const char *alias_url(const char *url, struct rewrites *r)
67 {
68 int i, j;
69 char *ret;
70 struct counted_string *longest;
71 int longest_i;
72
73 longest = NULL;
74 longest_i = -1;
75 for (i = 0; i < r->rewrite_nr; i++) {
76 if (!r->rewrite[i])
77 continue;
78 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
79 if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
80 (!longest ||
81 longest->len < r->rewrite[i]->instead_of[j].len)) {
82 longest = &(r->rewrite[i]->instead_of[j]);
83 longest_i = i;
84 }
85 }
86 }
87 if (!longest)
88 return url;
89
90 ret = xmalloc(r->rewrite[longest_i]->baselen +
91 (strlen(url) - longest->len) + 1);
92 strcpy(ret, r->rewrite[longest_i]->base);
93 strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
94 return ret;
95 }
96
97 static void add_push_refspec(struct remote *remote, const char *ref)
98 {
99 ALLOC_GROW(remote->push_refspec,
100 remote->push_refspec_nr + 1,
101 remote->push_refspec_alloc);
102 remote->push_refspec[remote->push_refspec_nr++] = ref;
103 }
104
105 static void add_fetch_refspec(struct remote *remote, const char *ref)
106 {
107 ALLOC_GROW(remote->fetch_refspec,
108 remote->fetch_refspec_nr + 1,
109 remote->fetch_refspec_alloc);
110 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
111 }
112
113 static void add_url(struct remote *remote, const char *url)
114 {
115 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
116 remote->url[remote->url_nr++] = url;
117 }
118
119 static void add_pushurl(struct remote *remote, const char *pushurl)
120 {
121 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
122 remote->pushurl[remote->pushurl_nr++] = pushurl;
123 }
124
125 static void add_pushurl_alias(struct remote *remote, const char *url)
126 {
127 const char *pushurl = alias_url(url, &rewrites_push);
128 if (pushurl != url)
129 add_pushurl(remote, pushurl);
130 }
131
132 static void add_url_alias(struct remote *remote, const char *url)
133 {
134 add_url(remote, alias_url(url, &rewrites));
135 add_pushurl_alias(remote, url);
136 }
137
138 static struct remote *make_remote(const char *name, int len)
139 {
140 struct remote *ret;
141 int i;
142
143 for (i = 0; i < remotes_nr; i++) {
144 if (len ? (!strncmp(name, remotes[i]->name, len) &&
145 !remotes[i]->name[len]) :
146 !strcmp(name, remotes[i]->name))
147 return remotes[i];
148 }
149
150 ret = xcalloc(1, sizeof(struct remote));
151 ret->prune = -1; /* unspecified */
152 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
153 remotes[remotes_nr++] = ret;
154 if (len)
155 ret->name = xstrndup(name, len);
156 else
157 ret->name = xstrdup(name);
158 return ret;
159 }
160
161 static void add_merge(struct branch *branch, const char *name)
162 {
163 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
164 branch->merge_alloc);
165 branch->merge_name[branch->merge_nr++] = name;
166 }
167
168 static struct branch *make_branch(const char *name, int len)
169 {
170 struct branch *ret;
171 int i;
172 char *refname;
173
174 for (i = 0; i < branches_nr; i++) {
175 if (len ? (!strncmp(name, branches[i]->name, len) &&
176 !branches[i]->name[len]) :
177 !strcmp(name, branches[i]->name))
178 return branches[i];
179 }
180
181 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
182 ret = xcalloc(1, sizeof(struct branch));
183 branches[branches_nr++] = ret;
184 if (len)
185 ret->name = xstrndup(name, len);
186 else
187 ret->name = xstrdup(name);
188 refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
189 strcpy(refname, "refs/heads/");
190 strcpy(refname + strlen("refs/heads/"), ret->name);
191 ret->refname = refname;
192
193 return ret;
194 }
195
196 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
197 {
198 struct rewrite *ret;
199 int i;
200
201 for (i = 0; i < r->rewrite_nr; i++) {
202 if (len
203 ? (len == r->rewrite[i]->baselen &&
204 !strncmp(base, r->rewrite[i]->base, len))
205 : !strcmp(base, r->rewrite[i]->base))
206 return r->rewrite[i];
207 }
208
209 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
210 ret = xcalloc(1, sizeof(struct rewrite));
211 r->rewrite[r->rewrite_nr++] = ret;
212 if (len) {
213 ret->base = xstrndup(base, len);
214 ret->baselen = len;
215 }
216 else {
217 ret->base = xstrdup(base);
218 ret->baselen = strlen(base);
219 }
220 return ret;
221 }
222
223 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
224 {
225 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
226 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
227 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
228 rewrite->instead_of_nr++;
229 }
230
231 static void read_remotes_file(struct remote *remote)
232 {
233 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
234
235 if (!f)
236 return;
237 remote->origin = REMOTE_REMOTES;
238 while (fgets(buffer, BUF_SIZE, f)) {
239 int value_list;
240 char *s, *p;
241
242 if (starts_with(buffer, "URL:")) {
243 value_list = 0;
244 s = buffer + 4;
245 } else if (starts_with(buffer, "Push:")) {
246 value_list = 1;
247 s = buffer + 5;
248 } else if (starts_with(buffer, "Pull:")) {
249 value_list = 2;
250 s = buffer + 5;
251 } else
252 continue;
253
254 while (isspace(*s))
255 s++;
256 if (!*s)
257 continue;
258
259 p = s + strlen(s);
260 while (isspace(p[-1]))
261 *--p = 0;
262
263 switch (value_list) {
264 case 0:
265 add_url_alias(remote, xstrdup(s));
266 break;
267 case 1:
268 add_push_refspec(remote, xstrdup(s));
269 break;
270 case 2:
271 add_fetch_refspec(remote, xstrdup(s));
272 break;
273 }
274 }
275 fclose(f);
276 }
277
278 static void read_branches_file(struct remote *remote)
279 {
280 char *frag;
281 struct strbuf branch = STRBUF_INIT;
282 int n = 1000;
283 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
284 char *s, *p;
285 int len;
286
287 if (!f)
288 return;
289 s = fgets(buffer, BUF_SIZE, f);
290 fclose(f);
291 if (!s)
292 return;
293 while (isspace(*s))
294 s++;
295 if (!*s)
296 return;
297 remote->origin = REMOTE_BRANCHES;
298 p = s + strlen(s);
299 while (isspace(p[-1]))
300 *--p = 0;
301 len = p - s;
302 p = xmalloc(len + 1);
303 strcpy(p, s);
304
305 /*
306 * The branches file would have URL and optionally
307 * #branch specified. The "master" (or specified) branch is
308 * fetched and stored in the local branch of the same name.
309 */
310 frag = strchr(p, '#');
311 if (frag) {
312 *(frag++) = '\0';
313 strbuf_addf(&branch, "refs/heads/%s", frag);
314 } else
315 strbuf_addstr(&branch, "refs/heads/master");
316
317 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
318 add_url_alias(remote, p);
319 add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
320 /*
321 * Cogito compatible push: push current HEAD to remote #branch
322 * (master if missing)
323 */
324 strbuf_init(&branch, 0);
325 strbuf_addstr(&branch, "HEAD");
326 if (frag)
327 strbuf_addf(&branch, ":refs/heads/%s", frag);
328 else
329 strbuf_addstr(&branch, ":refs/heads/master");
330 add_push_refspec(remote, strbuf_detach(&branch, NULL));
331 remote->fetch_tags = 1; /* always auto-follow */
332 }
333
334 static int handle_config(const char *key, const char *value, void *cb)
335 {
336 const char *name;
337 const char *subkey;
338 struct remote *remote;
339 struct branch *branch;
340 if (starts_with(key, "branch.")) {
341 name = key + 7;
342 subkey = strrchr(name, '.');
343 if (!subkey)
344 return 0;
345 branch = make_branch(name, subkey - name);
346 if (!strcmp(subkey, ".remote")) {
347 if (git_config_string(&branch->remote_name, key, value))
348 return -1;
349 if (branch == current_branch) {
350 default_remote_name = branch->remote_name;
351 explicit_default_remote_name = 1;
352 }
353 } else if (!strcmp(subkey, ".pushremote")) {
354 if (branch == current_branch)
355 if (git_config_string(&pushremote_name, key, value))
356 return -1;
357 } else if (!strcmp(subkey, ".merge")) {
358 if (!value)
359 return config_error_nonbool(key);
360 add_merge(branch, xstrdup(value));
361 }
362 return 0;
363 }
364 if (starts_with(key, "url.")) {
365 struct rewrite *rewrite;
366 name = key + 4;
367 subkey = strrchr(name, '.');
368 if (!subkey)
369 return 0;
370 if (!strcmp(subkey, ".insteadof")) {
371 rewrite = make_rewrite(&rewrites, name, subkey - name);
372 if (!value)
373 return config_error_nonbool(key);
374 add_instead_of(rewrite, xstrdup(value));
375 } else if (!strcmp(subkey, ".pushinsteadof")) {
376 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
377 if (!value)
378 return config_error_nonbool(key);
379 add_instead_of(rewrite, xstrdup(value));
380 }
381 }
382
383 if (!starts_with(key, "remote."))
384 return 0;
385 name = key + 7;
386
387 /* Handle remote.* variables */
388 if (!strcmp(name, "pushdefault"))
389 return git_config_string(&pushremote_name, key, value);
390
391 /* Handle remote.<name>.* variables */
392 if (*name == '/') {
393 warning("Config remote shorthand cannot begin with '/': %s",
394 name);
395 return 0;
396 }
397 subkey = strrchr(name, '.');
398 if (!subkey)
399 return 0;
400 remote = make_remote(name, subkey - name);
401 remote->origin = REMOTE_CONFIG;
402 if (!strcmp(subkey, ".mirror"))
403 remote->mirror = git_config_bool(key, value);
404 else if (!strcmp(subkey, ".skipdefaultupdate"))
405 remote->skip_default_update = git_config_bool(key, value);
406 else if (!strcmp(subkey, ".skipfetchall"))
407 remote->skip_default_update = git_config_bool(key, value);
408 else if (!strcmp(subkey, ".prune"))
409 remote->prune = git_config_bool(key, value);
410 else if (!strcmp(subkey, ".url")) {
411 const char *v;
412 if (git_config_string(&v, key, value))
413 return -1;
414 add_url(remote, v);
415 } else if (!strcmp(subkey, ".pushurl")) {
416 const char *v;
417 if (git_config_string(&v, key, value))
418 return -1;
419 add_pushurl(remote, v);
420 } else if (!strcmp(subkey, ".push")) {
421 const char *v;
422 if (git_config_string(&v, key, value))
423 return -1;
424 add_push_refspec(remote, v);
425 } else if (!strcmp(subkey, ".fetch")) {
426 const char *v;
427 if (git_config_string(&v, key, value))
428 return -1;
429 add_fetch_refspec(remote, v);
430 } else if (!strcmp(subkey, ".receivepack")) {
431 const char *v;
432 if (git_config_string(&v, key, value))
433 return -1;
434 if (!remote->receivepack)
435 remote->receivepack = v;
436 else
437 error("more than one receivepack given, using the first");
438 } else if (!strcmp(subkey, ".uploadpack")) {
439 const char *v;
440 if (git_config_string(&v, key, value))
441 return -1;
442 if (!remote->uploadpack)
443 remote->uploadpack = v;
444 else
445 error("more than one uploadpack given, using the first");
446 } else if (!strcmp(subkey, ".tagopt")) {
447 if (!strcmp(value, "--no-tags"))
448 remote->fetch_tags = -1;
449 else if (!strcmp(value, "--tags"))
450 remote->fetch_tags = 2;
451 } else if (!strcmp(subkey, ".proxy")) {
452 return git_config_string((const char **)&remote->http_proxy,
453 key, value);
454 } else if (!strcmp(subkey, ".vcs")) {
455 return git_config_string(&remote->foreign_vcs, key, value);
456 }
457 return 0;
458 }
459
460 static void alias_all_urls(void)
461 {
462 int i, j;
463 for (i = 0; i < remotes_nr; i++) {
464 int add_pushurl_aliases;
465 if (!remotes[i])
466 continue;
467 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
468 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
469 }
470 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
471 for (j = 0; j < remotes[i]->url_nr; j++) {
472 if (add_pushurl_aliases)
473 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
474 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
475 }
476 }
477 }
478
479 static void read_config(void)
480 {
481 unsigned char sha1[20];
482 const char *head_ref;
483 int flag;
484 if (default_remote_name) /* did this already */
485 return;
486 default_remote_name = "origin";
487 current_branch = NULL;
488 head_ref = resolve_ref_unsafe("HEAD", sha1, 0, &flag);
489 if (head_ref && (flag & REF_ISSYMREF) &&
490 starts_with(head_ref, "refs/heads/")) {
491 current_branch =
492 make_branch(head_ref + strlen("refs/heads/"), 0);
493 }
494 git_config(handle_config, NULL);
495 alias_all_urls();
496 }
497
498 /*
499 * This function frees a refspec array.
500 * Warning: code paths should be checked to ensure that the src
501 * and dst pointers are always freeable pointers as well
502 * as the refspec pointer itself.
503 */
504 static void free_refspecs(struct refspec *refspec, int nr_refspec)
505 {
506 int i;
507
508 if (!refspec)
509 return;
510
511 for (i = 0; i < nr_refspec; i++) {
512 free(refspec[i].src);
513 free(refspec[i].dst);
514 }
515 free(refspec);
516 }
517
518 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
519 {
520 int i;
521 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
522
523 for (i = 0; i < nr_refspec; i++) {
524 size_t llen;
525 int is_glob;
526 const char *lhs, *rhs;
527 int flags;
528
529 is_glob = 0;
530
531 lhs = refspec[i];
532 if (*lhs == '+') {
533 rs[i].force = 1;
534 lhs++;
535 }
536
537 rhs = strrchr(lhs, ':');
538
539 /*
540 * Before going on, special case ":" (or "+:") as a refspec
541 * for pushing matching refs.
542 */
543 if (!fetch && rhs == lhs && rhs[1] == '\0') {
544 rs[i].matching = 1;
545 continue;
546 }
547
548 if (rhs) {
549 size_t rlen = strlen(++rhs);
550 is_glob = (1 <= rlen && strchr(rhs, '*'));
551 rs[i].dst = xstrndup(rhs, rlen);
552 }
553
554 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
555 if (1 <= llen && memchr(lhs, '*', llen)) {
556 if ((rhs && !is_glob) || (!rhs && fetch))
557 goto invalid;
558 is_glob = 1;
559 } else if (rhs && is_glob) {
560 goto invalid;
561 }
562
563 rs[i].pattern = is_glob;
564 rs[i].src = xstrndup(lhs, llen);
565 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
566
567 if (fetch) {
568 unsigned char unused[40];
569
570 /* LHS */
571 if (!*rs[i].src)
572 ; /* empty is ok; it means "HEAD" */
573 else if (llen == 40 && !get_sha1_hex(rs[i].src, unused))
574 rs[i].exact_sha1 = 1; /* ok */
575 else if (!check_refname_format(rs[i].src, flags))
576 ; /* valid looking ref is ok */
577 else
578 goto invalid;
579 /* RHS */
580 if (!rs[i].dst)
581 ; /* missing is ok; it is the same as empty */
582 else if (!*rs[i].dst)
583 ; /* empty is ok; it means "do not store" */
584 else if (!check_refname_format(rs[i].dst, flags))
585 ; /* valid looking ref is ok */
586 else
587 goto invalid;
588 } else {
589 /*
590 * LHS
591 * - empty is allowed; it means delete.
592 * - when wildcarded, it must be a valid looking ref.
593 * - otherwise, it must be an extended SHA-1, but
594 * there is no existing way to validate this.
595 */
596 if (!*rs[i].src)
597 ; /* empty is ok */
598 else if (is_glob) {
599 if (check_refname_format(rs[i].src, flags))
600 goto invalid;
601 }
602 else
603 ; /* anything goes, for now */
604 /*
605 * RHS
606 * - missing is allowed, but LHS then must be a
607 * valid looking ref.
608 * - empty is not allowed.
609 * - otherwise it must be a valid looking ref.
610 */
611 if (!rs[i].dst) {
612 if (check_refname_format(rs[i].src, flags))
613 goto invalid;
614 } else if (!*rs[i].dst) {
615 goto invalid;
616 } else {
617 if (check_refname_format(rs[i].dst, flags))
618 goto invalid;
619 }
620 }
621 }
622 return rs;
623
624 invalid:
625 if (verify) {
626 /*
627 * nr_refspec must be greater than zero and i must be valid
628 * since it is only possible to reach this point from within
629 * the for loop above.
630 */
631 free_refspecs(rs, i+1);
632 return NULL;
633 }
634 die("Invalid refspec '%s'", refspec[i]);
635 }
636
637 int valid_fetch_refspec(const char *fetch_refspec_str)
638 {
639 struct refspec *refspec;
640
641 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
642 free_refspecs(refspec, 1);
643 return !!refspec;
644 }
645
646 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
647 {
648 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
649 }
650
651 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
652 {
653 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
654 }
655
656 void free_refspec(int nr_refspec, struct refspec *refspec)
657 {
658 int i;
659 for (i = 0; i < nr_refspec; i++) {
660 free(refspec[i].src);
661 free(refspec[i].dst);
662 }
663 free(refspec);
664 }
665
666 static int valid_remote_nick(const char *name)
667 {
668 if (!name[0] || is_dot_or_dotdot(name))
669 return 0;
670 return !strchr(name, '/'); /* no slash */
671 }
672
673 static struct remote *remote_get_1(const char *name, const char *pushremote_name)
674 {
675 struct remote *ret;
676 int name_given = 0;
677
678 if (name)
679 name_given = 1;
680 else {
681 if (pushremote_name) {
682 name = pushremote_name;
683 name_given = 1;
684 } else {
685 name = default_remote_name;
686 name_given = explicit_default_remote_name;
687 }
688 }
689
690 ret = make_remote(name, 0);
691 if (valid_remote_nick(name)) {
692 if (!valid_remote(ret))
693 read_remotes_file(ret);
694 if (!valid_remote(ret))
695 read_branches_file(ret);
696 }
697 if (name_given && !valid_remote(ret))
698 add_url_alias(ret, name);
699 if (!valid_remote(ret))
700 return NULL;
701 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
702 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
703 return ret;
704 }
705
706 struct remote *remote_get(const char *name)
707 {
708 read_config();
709 return remote_get_1(name, NULL);
710 }
711
712 struct remote *pushremote_get(const char *name)
713 {
714 read_config();
715 return remote_get_1(name, pushremote_name);
716 }
717
718 int remote_is_configured(const char *name)
719 {
720 int i;
721 read_config();
722
723 for (i = 0; i < remotes_nr; i++)
724 if (!strcmp(name, remotes[i]->name))
725 return 1;
726 return 0;
727 }
728
729 int for_each_remote(each_remote_fn fn, void *priv)
730 {
731 int i, result = 0;
732 read_config();
733 for (i = 0; i < remotes_nr && !result; i++) {
734 struct remote *r = remotes[i];
735 if (!r)
736 continue;
737 if (!r->fetch)
738 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
739 r->fetch_refspec);
740 if (!r->push)
741 r->push = parse_push_refspec(r->push_refspec_nr,
742 r->push_refspec);
743 result = fn(r, priv);
744 }
745 return result;
746 }
747
748 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
749 {
750 if (strcmp(ref1->name, ref2->name)) {
751 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
752 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
753 die(_("Cannot fetch both %s and %s to %s"),
754 ref1->name, ref2->name, ref2->peer_ref->name);
755 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
756 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
757 warning(_("%s usually tracks %s, not %s"),
758 ref2->peer_ref->name, ref2->name, ref1->name);
759 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
760 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
761 die(_("%s tracks both %s and %s"),
762 ref2->peer_ref->name, ref1->name, ref2->name);
763 } else {
764 /*
765 * This last possibility doesn't occur because
766 * FETCH_HEAD_IGNORE entries always appear at
767 * the end of the list.
768 */
769 die(_("Internal error"));
770 }
771 }
772 free(ref2->peer_ref);
773 free(ref2);
774 }
775
776 struct ref *ref_remove_duplicates(struct ref *ref_map)
777 {
778 struct string_list refs = STRING_LIST_INIT_NODUP;
779 struct ref *retval = NULL;
780 struct ref **p = &retval;
781
782 while (ref_map) {
783 struct ref *ref = ref_map;
784
785 ref_map = ref_map->next;
786 ref->next = NULL;
787
788 if (!ref->peer_ref) {
789 *p = ref;
790 p = &ref->next;
791 } else {
792 struct string_list_item *item =
793 string_list_insert(&refs, ref->peer_ref->name);
794
795 if (item->util) {
796 /* Entry already existed */
797 handle_duplicate((struct ref *)item->util, ref);
798 } else {
799 *p = ref;
800 p = &ref->next;
801 item->util = ref;
802 }
803 }
804 }
805
806 string_list_clear(&refs, 0);
807 return retval;
808 }
809
810 int remote_has_url(struct remote *remote, const char *url)
811 {
812 int i;
813 for (i = 0; i < remote->url_nr; i++) {
814 if (!strcmp(remote->url[i], url))
815 return 1;
816 }
817 return 0;
818 }
819
820 static int match_name_with_pattern(const char *key, const char *name,
821 const char *value, char **result)
822 {
823 const char *kstar = strchr(key, '*');
824 size_t klen;
825 size_t ksuffixlen;
826 size_t namelen;
827 int ret;
828 if (!kstar)
829 die("Key '%s' of pattern had no '*'", key);
830 klen = kstar - key;
831 ksuffixlen = strlen(kstar + 1);
832 namelen = strlen(name);
833 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
834 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
835 if (ret && value) {
836 const char *vstar = strchr(value, '*');
837 size_t vlen;
838 size_t vsuffixlen;
839 if (!vstar)
840 die("Value '%s' of pattern has no '*'", value);
841 vlen = vstar - value;
842 vsuffixlen = strlen(vstar + 1);
843 *result = xmalloc(vlen + vsuffixlen +
844 strlen(name) -
845 klen - ksuffixlen + 1);
846 strncpy(*result, value, vlen);
847 strncpy(*result + vlen,
848 name + klen, namelen - klen - ksuffixlen);
849 strcpy(*result + vlen + namelen - klen - ksuffixlen,
850 vstar + 1);
851 }
852 return ret;
853 }
854
855 int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
856 {
857 int i;
858 int find_src = !query->src;
859 const char *needle = find_src ? query->dst : query->src;
860 char **result = find_src ? &query->src : &query->dst;
861
862 if (find_src && !query->dst)
863 return error("query_refspecs: need either src or dst");
864
865 for (i = 0; i < ref_count; i++) {
866 struct refspec *refspec = &refs[i];
867 const char *key = find_src ? refspec->dst : refspec->src;
868 const char *value = find_src ? refspec->src : refspec->dst;
869
870 if (!refspec->dst)
871 continue;
872 if (refspec->pattern) {
873 if (match_name_with_pattern(key, needle, value, result)) {
874 query->force = refspec->force;
875 return 0;
876 }
877 } else if (!strcmp(needle, key)) {
878 *result = xstrdup(value);
879 query->force = refspec->force;
880 return 0;
881 }
882 }
883 return -1;
884 }
885
886 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
887 const char *name)
888 {
889 struct refspec query;
890
891 memset(&query, 0, sizeof(struct refspec));
892 query.src = (char *)name;
893
894 if (query_refspecs(refspecs, nr_refspec, &query))
895 return NULL;
896
897 return query.dst;
898 }
899
900 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
901 {
902 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
903 }
904
905 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
906 const char *name)
907 {
908 size_t len = strlen(name);
909 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
910 memcpy(ref->name, prefix, prefixlen);
911 memcpy(ref->name + prefixlen, name, len);
912 return ref;
913 }
914
915 struct ref *alloc_ref(const char *name)
916 {
917 return alloc_ref_with_prefix("", 0, name);
918 }
919
920 struct ref *copy_ref(const struct ref *ref)
921 {
922 struct ref *cpy;
923 size_t len;
924 if (!ref)
925 return NULL;
926 len = strlen(ref->name);
927 cpy = xmalloc(sizeof(struct ref) + len + 1);
928 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
929 cpy->next = NULL;
930 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
931 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
932 cpy->peer_ref = copy_ref(ref->peer_ref);
933 return cpy;
934 }
935
936 struct ref *copy_ref_list(const struct ref *ref)
937 {
938 struct ref *ret = NULL;
939 struct ref **tail = &ret;
940 while (ref) {
941 *tail = copy_ref(ref);
942 ref = ref->next;
943 tail = &((*tail)->next);
944 }
945 return ret;
946 }
947
948 static void free_ref(struct ref *ref)
949 {
950 if (!ref)
951 return;
952 free_ref(ref->peer_ref);
953 free(ref->remote_status);
954 free(ref->symref);
955 free(ref);
956 }
957
958 void free_refs(struct ref *ref)
959 {
960 struct ref *next;
961 while (ref) {
962 next = ref->next;
963 free_ref(ref);
964 ref = next;
965 }
966 }
967
968 int ref_compare_name(const void *va, const void *vb)
969 {
970 const struct ref *a = va, *b = vb;
971 return strcmp(a->name, b->name);
972 }
973
974 static void *ref_list_get_next(const void *a)
975 {
976 return ((const struct ref *)a)->next;
977 }
978
979 static void ref_list_set_next(void *a, void *next)
980 {
981 ((struct ref *)a)->next = next;
982 }
983
984 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
985 {
986 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
987 }
988
989 int count_refspec_match(const char *pattern,
990 struct ref *refs,
991 struct ref **matched_ref)
992 {
993 int patlen = strlen(pattern);
994 struct ref *matched_weak = NULL;
995 struct ref *matched = NULL;
996 int weak_match = 0;
997 int match = 0;
998
999 for (weak_match = match = 0; refs; refs = refs->next) {
1000 char *name = refs->name;
1001 int namelen = strlen(name);
1002
1003 if (!refname_match(pattern, name, ref_rev_parse_rules))
1004 continue;
1005
1006 /* A match is "weak" if it is with refs outside
1007 * heads or tags, and did not specify the pattern
1008 * in full (e.g. "refs/remotes/origin/master") or at
1009 * least from the toplevel (e.g. "remotes/origin/master");
1010 * otherwise "git push $URL master" would result in
1011 * ambiguity between remotes/origin/master and heads/master
1012 * at the remote site.
1013 */
1014 if (namelen != patlen &&
1015 patlen != namelen - 5 &&
1016 !starts_with(name, "refs/heads/") &&
1017 !starts_with(name, "refs/tags/")) {
1018 /* We want to catch the case where only weak
1019 * matches are found and there are multiple
1020 * matches, and where more than one strong
1021 * matches are found, as ambiguous. One
1022 * strong match with zero or more weak matches
1023 * are acceptable as a unique match.
1024 */
1025 matched_weak = refs;
1026 weak_match++;
1027 }
1028 else {
1029 matched = refs;
1030 match++;
1031 }
1032 }
1033 if (!matched) {
1034 *matched_ref = matched_weak;
1035 return weak_match;
1036 }
1037 else {
1038 *matched_ref = matched;
1039 return match;
1040 }
1041 }
1042
1043 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1044 {
1045 **tail = ref;
1046 while (ref->next)
1047 ref = ref->next;
1048 *tail = &ref->next;
1049 }
1050
1051 static struct ref *alloc_delete_ref(void)
1052 {
1053 struct ref *ref = alloc_ref("(delete)");
1054 hashclr(ref->new_sha1);
1055 return ref;
1056 }
1057
1058 static struct ref *try_explicit_object_name(const char *name)
1059 {
1060 unsigned char sha1[20];
1061 struct ref *ref;
1062
1063 if (!*name)
1064 return alloc_delete_ref();
1065 if (get_sha1(name, sha1))
1066 return NULL;
1067 ref = alloc_ref(name);
1068 hashcpy(ref->new_sha1, sha1);
1069 return ref;
1070 }
1071
1072 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1073 {
1074 struct ref *ret = alloc_ref(name);
1075 tail_link_ref(ret, tail);
1076 return ret;
1077 }
1078
1079 static char *guess_ref(const char *name, struct ref *peer)
1080 {
1081 struct strbuf buf = STRBUF_INIT;
1082 unsigned char sha1[20];
1083
1084 const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
1085 if (!r)
1086 return NULL;
1087
1088 if (starts_with(r, "refs/heads/"))
1089 strbuf_addstr(&buf, "refs/heads/");
1090 else if (starts_with(r, "refs/tags/"))
1091 strbuf_addstr(&buf, "refs/tags/");
1092 else
1093 return NULL;
1094
1095 strbuf_addstr(&buf, name);
1096 return strbuf_detach(&buf, NULL);
1097 }
1098
1099 static int match_explicit(struct ref *src, struct ref *dst,
1100 struct ref ***dst_tail,
1101 struct refspec *rs)
1102 {
1103 struct ref *matched_src, *matched_dst;
1104 int copy_src;
1105
1106 const char *dst_value = rs->dst;
1107 char *dst_guess;
1108
1109 if (rs->pattern || rs->matching)
1110 return 0;
1111
1112 matched_src = matched_dst = NULL;
1113 switch (count_refspec_match(rs->src, src, &matched_src)) {
1114 case 1:
1115 copy_src = 1;
1116 break;
1117 case 0:
1118 /* The source could be in the get_sha1() format
1119 * not a reference name. :refs/other is a
1120 * way to delete 'other' ref at the remote end.
1121 */
1122 matched_src = try_explicit_object_name(rs->src);
1123 if (!matched_src)
1124 return error("src refspec %s does not match any.", rs->src);
1125 copy_src = 0;
1126 break;
1127 default:
1128 return error("src refspec %s matches more than one.", rs->src);
1129 }
1130
1131 if (!dst_value) {
1132 unsigned char sha1[20];
1133 int flag;
1134
1135 dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
1136 if (!dst_value ||
1137 ((flag & REF_ISSYMREF) &&
1138 !starts_with(dst_value, "refs/heads/")))
1139 die("%s cannot be resolved to branch.",
1140 matched_src->name);
1141 }
1142
1143 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1144 case 1:
1145 break;
1146 case 0:
1147 if (!memcmp(dst_value, "refs/", 5))
1148 matched_dst = make_linked_ref(dst_value, dst_tail);
1149 else if (is_null_sha1(matched_src->new_sha1))
1150 error("unable to delete '%s': remote ref does not exist",
1151 dst_value);
1152 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1153 matched_dst = make_linked_ref(dst_guess, dst_tail);
1154 else
1155 error("unable to push to unqualified destination: %s\n"
1156 "The destination refspec neither matches an "
1157 "existing ref on the remote nor\n"
1158 "begins with refs/, and we are unable to "
1159 "guess a prefix based on the source ref.",
1160 dst_value);
1161 break;
1162 default:
1163 matched_dst = NULL;
1164 error("dst refspec %s matches more than one.",
1165 dst_value);
1166 break;
1167 }
1168 if (!matched_dst)
1169 return -1;
1170 if (matched_dst->peer_ref)
1171 return error("dst ref %s receives from more than one src.",
1172 matched_dst->name);
1173 else {
1174 matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1175 matched_dst->force = rs->force;
1176 }
1177 return 0;
1178 }
1179
1180 static int match_explicit_refs(struct ref *src, struct ref *dst,
1181 struct ref ***dst_tail, struct refspec *rs,
1182 int rs_nr)
1183 {
1184 int i, errs;
1185 for (i = errs = 0; i < rs_nr; i++)
1186 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1187 return errs;
1188 }
1189
1190 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1191 int send_mirror, int direction, const struct refspec **ret_pat)
1192 {
1193 const struct refspec *pat;
1194 char *name;
1195 int i;
1196 int matching_refs = -1;
1197 for (i = 0; i < rs_nr; i++) {
1198 if (rs[i].matching &&
1199 (matching_refs == -1 || rs[i].force)) {
1200 matching_refs = i;
1201 continue;
1202 }
1203
1204 if (rs[i].pattern) {
1205 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1206 int match;
1207 if (direction == FROM_SRC)
1208 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1209 else
1210 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1211 if (match) {
1212 matching_refs = i;
1213 break;
1214 }
1215 }
1216 }
1217 if (matching_refs == -1)
1218 return NULL;
1219
1220 pat = rs + matching_refs;
1221 if (pat->matching) {
1222 /*
1223 * "matching refs"; traditionally we pushed everything
1224 * including refs outside refs/heads/ hierarchy, but
1225 * that does not make much sense these days.
1226 */
1227 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1228 return NULL;
1229 name = xstrdup(ref->name);
1230 }
1231 if (ret_pat)
1232 *ret_pat = pat;
1233 return name;
1234 }
1235
1236 static struct ref **tail_ref(struct ref **head)
1237 {
1238 struct ref **tail = head;
1239 while (*tail)
1240 tail = &((*tail)->next);
1241 return tail;
1242 }
1243
1244 struct tips {
1245 struct commit **tip;
1246 int nr, alloc;
1247 };
1248
1249 static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1250 {
1251 struct commit *commit;
1252
1253 if (is_null_sha1(sha1))
1254 return;
1255 commit = lookup_commit_reference_gently(sha1, 1);
1256 if (!commit || (commit->object.flags & TMP_MARK))
1257 return;
1258 commit->object.flags |= TMP_MARK;
1259 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1260 tips->tip[tips->nr++] = commit;
1261 }
1262
1263 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1264 {
1265 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1266 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1267 struct string_list_item *item;
1268 struct ref *ref;
1269 struct tips sent_tips;
1270
1271 /*
1272 * Collect everything we know they would have at the end of
1273 * this push, and collect all tags they have.
1274 */
1275 memset(&sent_tips, 0, sizeof(sent_tips));
1276 for (ref = *dst; ref; ref = ref->next) {
1277 if (ref->peer_ref &&
1278 !is_null_sha1(ref->peer_ref->new_sha1))
1279 add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1280 else
1281 add_to_tips(&sent_tips, ref->old_sha1);
1282 if (starts_with(ref->name, "refs/tags/"))
1283 string_list_append(&dst_tag, ref->name);
1284 }
1285 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1286
1287 sort_string_list(&dst_tag);
1288
1289 /* Collect tags they do not have. */
1290 for (ref = src; ref; ref = ref->next) {
1291 if (!starts_with(ref->name, "refs/tags/"))
1292 continue; /* not a tag */
1293 if (string_list_has_string(&dst_tag, ref->name))
1294 continue; /* they already have it */
1295 if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1296 continue; /* be conservative */
1297 item = string_list_append(&src_tag, ref->name);
1298 item->util = ref;
1299 }
1300 string_list_clear(&dst_tag, 0);
1301
1302 /*
1303 * At this point, src_tag lists tags that are missing from
1304 * dst, and sent_tips lists the tips we are pushing or those
1305 * that we know they already have. An element in the src_tag
1306 * that is an ancestor of any of the sent_tips needs to be
1307 * sent to the other side.
1308 */
1309 if (sent_tips.nr) {
1310 for_each_string_list_item(item, &src_tag) {
1311 struct ref *ref = item->util;
1312 struct ref *dst_ref;
1313 struct commit *commit;
1314
1315 if (is_null_sha1(ref->new_sha1))
1316 continue;
1317 commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1318 if (!commit)
1319 /* not pushing a commit, which is not an error */
1320 continue;
1321
1322 /*
1323 * Is this tag, which they do not have, reachable from
1324 * any of the commits we are sending?
1325 */
1326 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1327 continue;
1328
1329 /* Add it in */
1330 dst_ref = make_linked_ref(ref->name, dst_tail);
1331 hashcpy(dst_ref->new_sha1, ref->new_sha1);
1332 dst_ref->peer_ref = copy_ref(ref);
1333 }
1334 }
1335 string_list_clear(&src_tag, 0);
1336 free(sent_tips.tip);
1337 }
1338
1339 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1340 {
1341 for ( ; list; list = list->next)
1342 if (!strcmp(list->name, name))
1343 return (struct ref *)list;
1344 return NULL;
1345 }
1346
1347 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1348 {
1349 for ( ; ref; ref = ref->next)
1350 string_list_append_nodup(ref_index, ref->name)->util = ref;
1351
1352 sort_string_list(ref_index);
1353 }
1354
1355 /*
1356 * Given the set of refs the local repository has, the set of refs the
1357 * remote repository has, and the refspec used for push, determine
1358 * what remote refs we will update and with what value by setting
1359 * peer_ref (which object is being pushed) and force (if the push is
1360 * forced) in elements of "dst". The function may add new elements to
1361 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1362 */
1363 int match_push_refs(struct ref *src, struct ref **dst,
1364 int nr_refspec, const char **refspec, int flags)
1365 {
1366 struct refspec *rs;
1367 int send_all = flags & MATCH_REFS_ALL;
1368 int send_mirror = flags & MATCH_REFS_MIRROR;
1369 int send_prune = flags & MATCH_REFS_PRUNE;
1370 int errs;
1371 static const char *default_refspec[] = { ":", NULL };
1372 struct ref *ref, **dst_tail = tail_ref(dst);
1373 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1374
1375 if (!nr_refspec) {
1376 nr_refspec = 1;
1377 refspec = default_refspec;
1378 }
1379 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1380 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1381
1382 /* pick the remainder */
1383 for (ref = src; ref; ref = ref->next) {
1384 struct string_list_item *dst_item;
1385 struct ref *dst_peer;
1386 const struct refspec *pat = NULL;
1387 char *dst_name;
1388
1389 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1390 if (!dst_name)
1391 continue;
1392
1393 if (!dst_ref_index.nr)
1394 prepare_ref_index(&dst_ref_index, *dst);
1395
1396 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1397 dst_peer = dst_item ? dst_item->util : NULL;
1398 if (dst_peer) {
1399 if (dst_peer->peer_ref)
1400 /* We're already sending something to this ref. */
1401 goto free_name;
1402 } else {
1403 if (pat->matching && !(send_all || send_mirror))
1404 /*
1405 * Remote doesn't have it, and we have no
1406 * explicit pattern, and we don't have
1407 * --all nor --mirror.
1408 */
1409 goto free_name;
1410
1411 /* Create a new one and link it */
1412 dst_peer = make_linked_ref(dst_name, &dst_tail);
1413 hashcpy(dst_peer->new_sha1, ref->new_sha1);
1414 string_list_insert(&dst_ref_index,
1415 dst_peer->name)->util = dst_peer;
1416 }
1417 dst_peer->peer_ref = copy_ref(ref);
1418 dst_peer->force = pat->force;
1419 free_name:
1420 free(dst_name);
1421 }
1422
1423 string_list_clear(&dst_ref_index, 0);
1424
1425 if (flags & MATCH_REFS_FOLLOW_TAGS)
1426 add_missing_tags(src, dst, &dst_tail);
1427
1428 if (send_prune) {
1429 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1430 /* check for missing refs on the remote */
1431 for (ref = *dst; ref; ref = ref->next) {
1432 char *src_name;
1433
1434 if (ref->peer_ref)
1435 /* We're already sending something to this ref. */
1436 continue;
1437
1438 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1439 if (src_name) {
1440 if (!src_ref_index.nr)
1441 prepare_ref_index(&src_ref_index, src);
1442 if (!string_list_has_string(&src_ref_index,
1443 src_name))
1444 ref->peer_ref = alloc_delete_ref();
1445 free(src_name);
1446 }
1447 }
1448 string_list_clear(&src_ref_index, 0);
1449 }
1450 if (errs)
1451 return -1;
1452 return 0;
1453 }
1454
1455 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1456 int force_update)
1457 {
1458 struct ref *ref;
1459
1460 for (ref = remote_refs; ref; ref = ref->next) {
1461 int force_ref_update = ref->force || force_update;
1462 int reject_reason = 0;
1463
1464 if (ref->peer_ref)
1465 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1466 else if (!send_mirror)
1467 continue;
1468
1469 ref->deletion = is_null_sha1(ref->new_sha1);
1470 if (!ref->deletion &&
1471 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1472 ref->status = REF_STATUS_UPTODATE;
1473 continue;
1474 }
1475
1476 /*
1477 * Bypass the usual "must fast-forward" check but
1478 * replace it with a weaker "the old value must be
1479 * this value we observed". If the remote ref has
1480 * moved and is now different from what we expect,
1481 * reject any push.
1482 *
1483 * It also is an error if the user told us to check
1484 * with the remote-tracking branch to find the value
1485 * to expect, but we did not have such a tracking
1486 * branch.
1487 */
1488 if (ref->expect_old_sha1) {
1489 if (ref->expect_old_no_trackback ||
1490 hashcmp(ref->old_sha1, ref->old_sha1_expect))
1491 reject_reason = REF_STATUS_REJECT_STALE;
1492 }
1493
1494 /*
1495 * The usual "must fast-forward" rules.
1496 *
1497 * Decide whether an individual refspec A:B can be
1498 * pushed. The push will succeed if any of the
1499 * following are true:
1500 *
1501 * (1) the remote reference B does not exist
1502 *
1503 * (2) the remote reference B is being removed (i.e.,
1504 * pushing :B where no source is specified)
1505 *
1506 * (3) the destination is not under refs/tags/, and
1507 * if the old and new value is a commit, the new
1508 * is a descendant of the old.
1509 *
1510 * (4) it is forced using the +A:B notation, or by
1511 * passing the --force argument
1512 */
1513
1514 else if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
1515 if (starts_with(ref->name, "refs/tags/"))
1516 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1517 else if (!has_sha1_file(ref->old_sha1))
1518 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1519 else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1520 !lookup_commit_reference_gently(ref->new_sha1, 1))
1521 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1522 else if (!ref_newer(ref->new_sha1, ref->old_sha1))
1523 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1524 }
1525
1526 /*
1527 * "--force" will defeat any rejection implemented
1528 * by the rules above.
1529 */
1530 if (!force_ref_update)
1531 ref->status = reject_reason;
1532 else if (reject_reason)
1533 ref->forced_update = 1;
1534 }
1535 }
1536
1537 struct branch *branch_get(const char *name)
1538 {
1539 struct branch *ret;
1540
1541 read_config();
1542 if (!name || !*name || !strcmp(name, "HEAD"))
1543 ret = current_branch;
1544 else
1545 ret = make_branch(name, 0);
1546 if (ret && ret->remote_name) {
1547 ret->remote = remote_get(ret->remote_name);
1548 if (ret->merge_nr) {
1549 int i;
1550 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1551 for (i = 0; i < ret->merge_nr; i++) {
1552 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1553 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1554 if (remote_find_tracking(ret->remote, ret->merge[i])
1555 && !strcmp(ret->remote_name, "."))
1556 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1557 }
1558 }
1559 }
1560 return ret;
1561 }
1562
1563 int branch_has_merge_config(struct branch *branch)
1564 {
1565 return branch && !!branch->merge;
1566 }
1567
1568 int branch_merge_matches(struct branch *branch,
1569 int i,
1570 const char *refname)
1571 {
1572 if (!branch || i < 0 || i >= branch->merge_nr)
1573 return 0;
1574 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1575 }
1576
1577 static int ignore_symref_update(const char *refname)
1578 {
1579 unsigned char sha1[20];
1580 int flag;
1581
1582 if (!resolve_ref_unsafe(refname, sha1, 0, &flag))
1583 return 0; /* non-existing refs are OK */
1584 return (flag & REF_ISSYMREF);
1585 }
1586
1587 /*
1588 * Create and return a list of (struct ref) consisting of copies of
1589 * each remote_ref that matches refspec. refspec must be a pattern.
1590 * Fill in the copies' peer_ref to describe the local tracking refs to
1591 * which they map. Omit any references that would map to an existing
1592 * local symbolic ref.
1593 */
1594 static struct ref *get_expanded_map(const struct ref *remote_refs,
1595 const struct refspec *refspec)
1596 {
1597 const struct ref *ref;
1598 struct ref *ret = NULL;
1599 struct ref **tail = &ret;
1600
1601 for (ref = remote_refs; ref; ref = ref->next) {
1602 char *expn_name = NULL;
1603
1604 if (strchr(ref->name, '^'))
1605 continue; /* a dereference item */
1606 if (match_name_with_pattern(refspec->src, ref->name,
1607 refspec->dst, &expn_name) &&
1608 !ignore_symref_update(expn_name)) {
1609 struct ref *cpy = copy_ref(ref);
1610
1611 cpy->peer_ref = alloc_ref(expn_name);
1612 if (refspec->force)
1613 cpy->peer_ref->force = 1;
1614 *tail = cpy;
1615 tail = &cpy->next;
1616 }
1617 free(expn_name);
1618 }
1619
1620 return ret;
1621 }
1622
1623 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1624 {
1625 const struct ref *ref;
1626 for (ref = refs; ref; ref = ref->next) {
1627 if (refname_match(name, ref->name, ref_fetch_rules))
1628 return ref;
1629 }
1630 return NULL;
1631 }
1632
1633 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1634 {
1635 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1636
1637 if (!ref)
1638 return NULL;
1639
1640 return copy_ref(ref);
1641 }
1642
1643 static struct ref *get_local_ref(const char *name)
1644 {
1645 if (!name || name[0] == '\0')
1646 return NULL;
1647
1648 if (starts_with(name, "refs/"))
1649 return alloc_ref(name);
1650
1651 if (starts_with(name, "heads/") ||
1652 starts_with(name, "tags/") ||
1653 starts_with(name, "remotes/"))
1654 return alloc_ref_with_prefix("refs/", 5, name);
1655
1656 return alloc_ref_with_prefix("refs/heads/", 11, name);
1657 }
1658
1659 int get_fetch_map(const struct ref *remote_refs,
1660 const struct refspec *refspec,
1661 struct ref ***tail,
1662 int missing_ok)
1663 {
1664 struct ref *ref_map, **rmp;
1665
1666 if (refspec->pattern) {
1667 ref_map = get_expanded_map(remote_refs, refspec);
1668 } else {
1669 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1670
1671 if (refspec->exact_sha1) {
1672 ref_map = alloc_ref(name);
1673 get_sha1_hex(name, ref_map->old_sha1);
1674 } else {
1675 ref_map = get_remote_ref(remote_refs, name);
1676 }
1677 if (!missing_ok && !ref_map)
1678 die("Couldn't find remote ref %s", name);
1679 if (ref_map) {
1680 ref_map->peer_ref = get_local_ref(refspec->dst);
1681 if (ref_map->peer_ref && refspec->force)
1682 ref_map->peer_ref->force = 1;
1683 }
1684 }
1685
1686 for (rmp = &ref_map; *rmp; ) {
1687 if ((*rmp)->peer_ref) {
1688 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1689 check_refname_format((*rmp)->peer_ref->name, 0)) {
1690 struct ref *ignore = *rmp;
1691 error("* Ignoring funny ref '%s' locally",
1692 (*rmp)->peer_ref->name);
1693 *rmp = (*rmp)->next;
1694 free(ignore->peer_ref);
1695 free(ignore);
1696 continue;
1697 }
1698 }
1699 rmp = &((*rmp)->next);
1700 }
1701
1702 if (ref_map)
1703 tail_link_ref(ref_map, tail);
1704
1705 return 0;
1706 }
1707
1708 int resolve_remote_symref(struct ref *ref, struct ref *list)
1709 {
1710 if (!ref->symref)
1711 return 0;
1712 for (; list; list = list->next)
1713 if (!strcmp(ref->symref, list->name)) {
1714 hashcpy(ref->old_sha1, list->old_sha1);
1715 return 0;
1716 }
1717 return 1;
1718 }
1719
1720 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1721 {
1722 while (list) {
1723 struct commit_list *temp = list;
1724 temp->item->object.flags &= ~mark;
1725 list = temp->next;
1726 free(temp);
1727 }
1728 }
1729
1730 int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1731 {
1732 struct object *o;
1733 struct commit *old, *new;
1734 struct commit_list *list, *used;
1735 int found = 0;
1736
1737 /*
1738 * Both new and old must be commit-ish and new is descendant of
1739 * old. Otherwise we require --force.
1740 */
1741 o = deref_tag(parse_object(old_sha1), NULL, 0);
1742 if (!o || o->type != OBJ_COMMIT)
1743 return 0;
1744 old = (struct commit *) o;
1745
1746 o = deref_tag(parse_object(new_sha1), NULL, 0);
1747 if (!o || o->type != OBJ_COMMIT)
1748 return 0;
1749 new = (struct commit *) o;
1750
1751 if (parse_commit(new) < 0)
1752 return 0;
1753
1754 used = list = NULL;
1755 commit_list_insert(new, &list);
1756 while (list) {
1757 new = pop_most_recent_commit(&list, TMP_MARK);
1758 commit_list_insert(new, &used);
1759 if (new == old) {
1760 found = 1;
1761 break;
1762 }
1763 }
1764 unmark_and_free(list, TMP_MARK);
1765 unmark_and_free(used, TMP_MARK);
1766 return found;
1767 }
1768
1769 /*
1770 * Compare a branch with its upstream, and save their differences (number
1771 * of commits) in *num_ours and *num_theirs.
1772 *
1773 * Return 0 if branch has no upstream (no base), -1 if upstream is missing
1774 * (with "gone" base), otherwise 1 (with base).
1775 */
1776 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1777 {
1778 unsigned char sha1[20];
1779 struct commit *ours, *theirs;
1780 char symmetric[84];
1781 struct rev_info revs;
1782 const char *rev_argv[10], *base;
1783 int rev_argc;
1784
1785 /* Cannot stat unless we are marked to build on top of somebody else. */
1786 if (!branch ||
1787 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1788 return 0;
1789
1790 /* Cannot stat if what we used to build on no longer exists */
1791 base = branch->merge[0]->dst;
1792 if (read_ref(base, sha1))
1793 return -1;
1794 theirs = lookup_commit_reference(sha1);
1795 if (!theirs)
1796 return -1;
1797
1798 if (read_ref(branch->refname, sha1))
1799 return -1;
1800 ours = lookup_commit_reference(sha1);
1801 if (!ours)
1802 return -1;
1803
1804 /* are we the same? */
1805 if (theirs == ours) {
1806 *num_theirs = *num_ours = 0;
1807 return 1;
1808 }
1809
1810 /* Run "rev-list --left-right ours...theirs" internally... */
1811 rev_argc = 0;
1812 rev_argv[rev_argc++] = NULL;
1813 rev_argv[rev_argc++] = "--left-right";
1814 rev_argv[rev_argc++] = symmetric;
1815 rev_argv[rev_argc++] = "--";
1816 rev_argv[rev_argc] = NULL;
1817
1818 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1819 strcpy(symmetric + 40, "...");
1820 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1821
1822 init_revisions(&revs, NULL);
1823 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1824 prepare_revision_walk(&revs);
1825
1826 /* ... and count the commits on each side. */
1827 *num_ours = 0;
1828 *num_theirs = 0;
1829 while (1) {
1830 struct commit *c = get_revision(&revs);
1831 if (!c)
1832 break;
1833 if (c->object.flags & SYMMETRIC_LEFT)
1834 (*num_ours)++;
1835 else
1836 (*num_theirs)++;
1837 }
1838
1839 /* clear object flags smudged by the above traversal */
1840 clear_commit_marks(ours, ALL_REV_FLAGS);
1841 clear_commit_marks(theirs, ALL_REV_FLAGS);
1842 return 1;
1843 }
1844
1845 /*
1846 * Return true when there is anything to report, otherwise false.
1847 */
1848 int format_tracking_info(struct branch *branch, struct strbuf *sb)
1849 {
1850 int ours, theirs;
1851 const char *base;
1852 int upstream_is_gone = 0;
1853
1854 switch (stat_tracking_info(branch, &ours, &theirs)) {
1855 case 0:
1856 /* no base */
1857 return 0;
1858 case -1:
1859 /* with "gone" base */
1860 upstream_is_gone = 1;
1861 break;
1862 default:
1863 /* with base */
1864 break;
1865 }
1866
1867 base = branch->merge[0]->dst;
1868 base = shorten_unambiguous_ref(base, 0);
1869 if (upstream_is_gone) {
1870 strbuf_addf(sb,
1871 _("Your branch is based on '%s', but the upstream is gone.\n"),
1872 base);
1873 if (advice_status_hints)
1874 strbuf_addf(sb,
1875 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
1876 } else if (!ours && !theirs) {
1877 strbuf_addf(sb,
1878 _("Your branch is up-to-date with '%s'.\n"),
1879 base);
1880 } else if (!theirs) {
1881 strbuf_addf(sb,
1882 Q_("Your branch is ahead of '%s' by %d commit.\n",
1883 "Your branch is ahead of '%s' by %d commits.\n",
1884 ours),
1885 base, ours);
1886 if (advice_status_hints)
1887 strbuf_addf(sb,
1888 _(" (use \"git push\" to publish your local commits)\n"));
1889 } else if (!ours) {
1890 strbuf_addf(sb,
1891 Q_("Your branch is behind '%s' by %d commit, "
1892 "and can be fast-forwarded.\n",
1893 "Your branch is behind '%s' by %d commits, "
1894 "and can be fast-forwarded.\n",
1895 theirs),
1896 base, theirs);
1897 if (advice_status_hints)
1898 strbuf_addf(sb,
1899 _(" (use \"git pull\" to update your local branch)\n"));
1900 } else {
1901 strbuf_addf(sb,
1902 Q_("Your branch and '%s' have diverged,\n"
1903 "and have %d and %d different commit each, "
1904 "respectively.\n",
1905 "Your branch and '%s' have diverged,\n"
1906 "and have %d and %d different commits each, "
1907 "respectively.\n",
1908 theirs),
1909 base, ours, theirs);
1910 if (advice_status_hints)
1911 strbuf_addf(sb,
1912 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
1913 }
1914 return 1;
1915 }
1916
1917 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1918 {
1919 struct ref ***local_tail = cb_data;
1920 struct ref *ref;
1921 int len;
1922
1923 /* we already know it starts with refs/ to get here */
1924 if (check_refname_format(refname + 5, 0))
1925 return 0;
1926
1927 len = strlen(refname) + 1;
1928 ref = xcalloc(1, sizeof(*ref) + len);
1929 hashcpy(ref->new_sha1, sha1);
1930 memcpy(ref->name, refname, len);
1931 **local_tail = ref;
1932 *local_tail = &ref->next;
1933 return 0;
1934 }
1935
1936 struct ref *get_local_heads(void)
1937 {
1938 struct ref *local_refs = NULL, **local_tail = &local_refs;
1939 for_each_ref(one_local_ref, &local_tail);
1940 return local_refs;
1941 }
1942
1943 struct ref *guess_remote_head(const struct ref *head,
1944 const struct ref *refs,
1945 int all)
1946 {
1947 const struct ref *r;
1948 struct ref *list = NULL;
1949 struct ref **tail = &list;
1950
1951 if (!head)
1952 return NULL;
1953
1954 /*
1955 * Some transports support directly peeking at
1956 * where HEAD points; if that is the case, then
1957 * we don't have to guess.
1958 */
1959 if (head->symref)
1960 return copy_ref(find_ref_by_name(refs, head->symref));
1961
1962 /* If refs/heads/master could be right, it is. */
1963 if (!all) {
1964 r = find_ref_by_name(refs, "refs/heads/master");
1965 if (r && !hashcmp(r->old_sha1, head->old_sha1))
1966 return copy_ref(r);
1967 }
1968
1969 /* Look for another ref that points there */
1970 for (r = refs; r; r = r->next) {
1971 if (r != head &&
1972 starts_with(r->name, "refs/heads/") &&
1973 !hashcmp(r->old_sha1, head->old_sha1)) {
1974 *tail = copy_ref(r);
1975 tail = &((*tail)->next);
1976 if (!all)
1977 break;
1978 }
1979 }
1980
1981 return list;
1982 }
1983
1984 struct stale_heads_info {
1985 struct string_list *ref_names;
1986 struct ref **stale_refs_tail;
1987 struct refspec *refs;
1988 int ref_count;
1989 };
1990
1991 static int get_stale_heads_cb(const char *refname,
1992 const unsigned char *sha1, int flags, void *cb_data)
1993 {
1994 struct stale_heads_info *info = cb_data;
1995 struct refspec query;
1996 memset(&query, 0, sizeof(struct refspec));
1997 query.dst = (char *)refname;
1998
1999 if (query_refspecs(info->refs, info->ref_count, &query))
2000 return 0; /* No matches */
2001
2002 /*
2003 * If we did find a suitable refspec and it's not a symref and
2004 * it's not in the list of refs that currently exist in that
2005 * remote we consider it to be stale.
2006 */
2007 if (!((flags & REF_ISSYMREF) ||
2008 string_list_has_string(info->ref_names, query.src))) {
2009 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2010 hashcpy(ref->new_sha1, sha1);
2011 }
2012
2013 free(query.src);
2014 return 0;
2015 }
2016
2017 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2018 {
2019 struct ref *ref, *stale_refs = NULL;
2020 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2021 struct stale_heads_info info;
2022 info.ref_names = &ref_names;
2023 info.stale_refs_tail = &stale_refs;
2024 info.refs = refs;
2025 info.ref_count = ref_count;
2026 for (ref = fetch_map; ref; ref = ref->next)
2027 string_list_append(&ref_names, ref->name);
2028 sort_string_list(&ref_names);
2029 for_each_ref(get_stale_heads_cb, &info);
2030 string_list_clear(&ref_names, 0);
2031 return stale_refs;
2032 }
2033
2034 /*
2035 * Compare-and-swap
2036 */
2037 void clear_cas_option(struct push_cas_option *cas)
2038 {
2039 int i;
2040
2041 for (i = 0; i < cas->nr; i++)
2042 free(cas->entry[i].refname);
2043 free(cas->entry);
2044 memset(cas, 0, sizeof(*cas));
2045 }
2046
2047 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2048 const char *refname,
2049 size_t refnamelen)
2050 {
2051 struct push_cas *entry;
2052 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2053 entry = &cas->entry[cas->nr++];
2054 memset(entry, 0, sizeof(*entry));
2055 entry->refname = xmemdupz(refname, refnamelen);
2056 return entry;
2057 }
2058
2059 int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2060 {
2061 const char *colon;
2062 struct push_cas *entry;
2063
2064 if (unset) {
2065 /* "--no-<option>" */
2066 clear_cas_option(cas);
2067 return 0;
2068 }
2069
2070 if (!arg) {
2071 /* just "--<option>" */
2072 cas->use_tracking_for_rest = 1;
2073 return 0;
2074 }
2075
2076 /* "--<option>=refname" or "--<option>=refname:value" */
2077 colon = strchrnul(arg, ':');
2078 entry = add_cas_entry(cas, arg, colon - arg);
2079 if (!*colon)
2080 entry->use_tracking = 1;
2081 else if (get_sha1(colon + 1, entry->expect))
2082 return error("cannot parse expected object name '%s'", colon + 1);
2083 return 0;
2084 }
2085
2086 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2087 {
2088 return parse_push_cas_option(opt->value, arg, unset);
2089 }
2090
2091 int is_empty_cas(const struct push_cas_option *cas)
2092 {
2093 return !cas->use_tracking_for_rest && !cas->nr;
2094 }
2095
2096 /*
2097 * Look at remote.fetch refspec and see if we have a remote
2098 * tracking branch for the refname there. Fill its current
2099 * value in sha1[].
2100 * If we cannot do so, return negative to signal an error.
2101 */
2102 static int remote_tracking(struct remote *remote, const char *refname,
2103 unsigned char sha1[20])
2104 {
2105 char *dst;
2106
2107 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2108 if (!dst)
2109 return -1; /* no tracking ref for refname at remote */
2110 if (read_ref(dst, sha1))
2111 return -1; /* we know what the tracking ref is but we cannot read it */
2112 return 0;
2113 }
2114
2115 static void apply_cas(struct push_cas_option *cas,
2116 struct remote *remote,
2117 struct ref *ref)
2118 {
2119 int i;
2120
2121 /* Find an explicit --<option>=<name>[:<value>] entry */
2122 for (i = 0; i < cas->nr; i++) {
2123 struct push_cas *entry = &cas->entry[i];
2124 if (!refname_match(entry->refname, ref->name, ref_rev_parse_rules))
2125 continue;
2126 ref->expect_old_sha1 = 1;
2127 if (!entry->use_tracking)
2128 hashcpy(ref->old_sha1_expect, cas->entry[i].expect);
2129 else if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2130 ref->expect_old_no_trackback = 1;
2131 return;
2132 }
2133
2134 /* Are we using "--<option>" to cover all? */
2135 if (!cas->use_tracking_for_rest)
2136 return;
2137
2138 ref->expect_old_sha1 = 1;
2139 if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2140 ref->expect_old_no_trackback = 1;
2141 }
2142
2143 void apply_push_cas(struct push_cas_option *cas,
2144 struct remote *remote,
2145 struct ref *remote_refs)
2146 {
2147 struct ref *ref;
2148 for (ref = remote_refs; ref; ref = ref->next)
2149 apply_cas(cas, remote, ref);
2150 }
Jonathan Nieder’s miscellaneous git branches