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ref_remove_duplicates(): simplify loop logic
[alt-git.git] / remote.c
blobf803990760accb3e0d49dcde7c95965e326e6147
1 #include "cache.h"
2 #include "remote.h"
3 #include "refs.h"
4 #include "commit.h"
5 #include "diff.h"
6 #include "revision.h"
7 #include "dir.h"
8 #include "tag.h"
9 #include "string-list.h"
10 #include "mergesort.h"
11
12 enum map_direction { FROM_SRC, FROM_DST };
13
14 static struct refspec s_tag_refspec = {
15 0,
16 1,
17 0,
18 0,
19 "refs/tags/*",
20 "refs/tags/*"
21 };
22
23 const struct refspec *tag_refspec = &s_tag_refspec;
24
25 struct counted_string {
26 size_t len;
27 const char *s;
28 };
29 struct rewrite {
30 const char *base;
31 size_t baselen;
32 struct counted_string *instead_of;
33 int instead_of_nr;
34 int instead_of_alloc;
35 };
36 struct rewrites {
37 struct rewrite **rewrite;
38 int rewrite_alloc;
39 int rewrite_nr;
40 };
41
42 static struct remote **remotes;
43 static int remotes_alloc;
44 static int remotes_nr;
45
46 static struct branch **branches;
47 static int branches_alloc;
48 static int branches_nr;
49
50 static struct branch *current_branch;
51 static const char *default_remote_name;
52 static const char *pushremote_name;
53 static int explicit_default_remote_name;
54
55 static struct rewrites rewrites;
56 static struct rewrites rewrites_push;
57
58 #define BUF_SIZE (2048)
59 static char buffer[BUF_SIZE];
60
61 static int valid_remote(const struct remote *remote)
62 {
63 return (!!remote->url) || (!!remote->foreign_vcs);
64 }
65
66 static const char *alias_url(const char *url, struct rewrites *r)
67 {
68 int i, j;
69 char *ret;
70 struct counted_string *longest;
71 int longest_i;
72
73 longest = NULL;
74 longest_i = -1;
75 for (i = 0; i < r->rewrite_nr; i++) {
76 if (!r->rewrite[i])
77 continue;
78 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
79 if (!prefixcmp(url, r->rewrite[i]->instead_of[j].s) &&
80 (!longest ||
81 longest->len < r->rewrite[i]->instead_of[j].len)) {
82 longest = &(r->rewrite[i]->instead_of[j]);
83 longest_i = i;
84 }
85 }
86 }
87 if (!longest)
88 return url;
89
90 ret = xmalloc(r->rewrite[longest_i]->baselen +
91 (strlen(url) - longest->len) + 1);
92 strcpy(ret, r->rewrite[longest_i]->base);
93 strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
94 return ret;
95 }
96
97 static void add_push_refspec(struct remote *remote, const char *ref)
98 {
99 ALLOC_GROW(remote->push_refspec,
100 remote->push_refspec_nr + 1,
101 remote->push_refspec_alloc);
102 remote->push_refspec[remote->push_refspec_nr++] = ref;
103 }
104
105 static void add_fetch_refspec(struct remote *remote, const char *ref)
106 {
107 ALLOC_GROW(remote->fetch_refspec,
108 remote->fetch_refspec_nr + 1,
109 remote->fetch_refspec_alloc);
110 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
111 }
112
113 static void add_url(struct remote *remote, const char *url)
114 {
115 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
116 remote->url[remote->url_nr++] = url;
117 }
118
119 static void add_pushurl(struct remote *remote, const char *pushurl)
120 {
121 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
122 remote->pushurl[remote->pushurl_nr++] = pushurl;
123 }
124
125 static void add_pushurl_alias(struct remote *remote, const char *url)
126 {
127 const char *pushurl = alias_url(url, &rewrites_push);
128 if (pushurl != url)
129 add_pushurl(remote, pushurl);
130 }
131
132 static void add_url_alias(struct remote *remote, const char *url)
133 {
134 add_url(remote, alias_url(url, &rewrites));
135 add_pushurl_alias(remote, url);
136 }
137
138 static struct remote *make_remote(const char *name, int len)
139 {
140 struct remote *ret;
141 int i;
142
143 for (i = 0; i < remotes_nr; i++) {
144 if (len ? (!strncmp(name, remotes[i]->name, len) &&
145 !remotes[i]->name[len]) :
146 !strcmp(name, remotes[i]->name))
147 return remotes[i];
148 }
149
150 ret = xcalloc(1, sizeof(struct remote));
151 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 (!prefixcmp(buffer, "URL:")) {
243 value_list = 0;
244 s = buffer + 4;
245 } else if (!prefixcmp(buffer, "Push:")) {
246 value_list = 1;
247 s = buffer + 5;
248 } else if (!prefixcmp(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 (!prefixcmp(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 (!prefixcmp(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 (prefixcmp(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 = xstrdup("origin");
487 current_branch = NULL;
488 head_ref = resolve_ref_unsafe("HEAD", sha1, 0, &flag);
489 if (head_ref && (flag & REF_ISSYMREF) &&
490 !prefixcmp(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 struct ref *ref_remove_duplicates(struct ref *ref_map)
749 {
750 struct string_list refs = STRING_LIST_INIT_NODUP;
751 struct ref *retval = NULL;
752 struct ref **p = &retval;
753
754 while (ref_map) {
755 struct ref *ref = ref_map;
756
757 ref_map = ref_map->next;
758 ref->next = NULL;
759
760 if (!ref->peer_ref) {
761 *p = ref;
762 p = &ref->next;
763 } else {
764 struct string_list_item *item =
765 string_list_insert(&refs, ref->peer_ref->name);
766
767 if (item->util) {
768 /* Entry already existed */
769 if (strcmp(((struct ref *)item->util)->name,
770 ref->name))
771 die("%s tracks both %s and %s",
772 ref->peer_ref->name,
773 ((struct ref *)item->util)->name,
774 ref->name);
775 free(ref->peer_ref);
776 free(ref);
777 } else {
778 *p = ref;
779 p = &ref->next;
780 item->util = ref;
781 }
782 }
783 }
784
785 string_list_clear(&refs, 0);
786 return retval;
787 }
788
789 int remote_has_url(struct remote *remote, const char *url)
790 {
791 int i;
792 for (i = 0; i < remote->url_nr; i++) {
793 if (!strcmp(remote->url[i], url))
794 return 1;
795 }
796 return 0;
797 }
798
799 static int match_name_with_pattern(const char *key, const char *name,
800 const char *value, char **result)
801 {
802 const char *kstar = strchr(key, '*');
803 size_t klen;
804 size_t ksuffixlen;
805 size_t namelen;
806 int ret;
807 if (!kstar)
808 die("Key '%s' of pattern had no '*'", key);
809 klen = kstar - key;
810 ksuffixlen = strlen(kstar + 1);
811 namelen = strlen(name);
812 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
813 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
814 if (ret && value) {
815 const char *vstar = strchr(value, '*');
816 size_t vlen;
817 size_t vsuffixlen;
818 if (!vstar)
819 die("Value '%s' of pattern has no '*'", value);
820 vlen = vstar - value;
821 vsuffixlen = strlen(vstar + 1);
822 *result = xmalloc(vlen + vsuffixlen +
823 strlen(name) -
824 klen - ksuffixlen + 1);
825 strncpy(*result, value, vlen);
826 strncpy(*result + vlen,
827 name + klen, namelen - klen - ksuffixlen);
828 strcpy(*result + vlen + namelen - klen - ksuffixlen,
829 vstar + 1);
830 }
831 return ret;
832 }
833
834 static int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
835 {
836 int i;
837 int find_src = !query->src;
838 const char *needle = find_src ? query->dst : query->src;
839 char **result = find_src ? &query->src : &query->dst;
840
841 if (find_src && !query->dst)
842 return error("query_refspecs: need either src or dst");
843
844 for (i = 0; i < ref_count; i++) {
845 struct refspec *refspec = &refs[i];
846 const char *key = find_src ? refspec->dst : refspec->src;
847 const char *value = find_src ? refspec->src : refspec->dst;
848
849 if (!refspec->dst)
850 continue;
851 if (refspec->pattern) {
852 if (match_name_with_pattern(key, needle, value, result)) {
853 query->force = refspec->force;
854 return 0;
855 }
856 } else if (!strcmp(needle, key)) {
857 *result = xstrdup(value);
858 query->force = refspec->force;
859 return 0;
860 }
861 }
862 return -1;
863 }
864
865 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
866 const char *name)
867 {
868 struct refspec query;
869
870 memset(&query, 0, sizeof(struct refspec));
871 query.src = (char *)name;
872
873 if (query_refspecs(refspecs, nr_refspec, &query))
874 return NULL;
875
876 return query.dst;
877 }
878
879 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
880 {
881 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
882 }
883
884 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
885 const char *name)
886 {
887 size_t len = strlen(name);
888 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
889 memcpy(ref->name, prefix, prefixlen);
890 memcpy(ref->name + prefixlen, name, len);
891 return ref;
892 }
893
894 struct ref *alloc_ref(const char *name)
895 {
896 return alloc_ref_with_prefix("", 0, name);
897 }
898
899 struct ref *copy_ref(const struct ref *ref)
900 {
901 struct ref *cpy;
902 size_t len;
903 if (!ref)
904 return NULL;
905 len = strlen(ref->name);
906 cpy = xmalloc(sizeof(struct ref) + len + 1);
907 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
908 cpy->next = NULL;
909 cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
910 cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
911 cpy->peer_ref = copy_ref(ref->peer_ref);
912 return cpy;
913 }
914
915 struct ref *copy_ref_list(const struct ref *ref)
916 {
917 struct ref *ret = NULL;
918 struct ref **tail = &ret;
919 while (ref) {
920 *tail = copy_ref(ref);
921 ref = ref->next;
922 tail = &((*tail)->next);
923 }
924 return ret;
925 }
926
927 static void free_ref(struct ref *ref)
928 {
929 if (!ref)
930 return;
931 free_ref(ref->peer_ref);
932 free(ref->remote_status);
933 free(ref->symref);
934 free(ref);
935 }
936
937 void free_refs(struct ref *ref)
938 {
939 struct ref *next;
940 while (ref) {
941 next = ref->next;
942 free_ref(ref);
943 ref = next;
944 }
945 }
946
947 int ref_compare_name(const void *va, const void *vb)
948 {
949 const struct ref *a = va, *b = vb;
950 return strcmp(a->name, b->name);
951 }
952
953 static void *ref_list_get_next(const void *a)
954 {
955 return ((const struct ref *)a)->next;
956 }
957
958 static void ref_list_set_next(void *a, void *next)
959 {
960 ((struct ref *)a)->next = next;
961 }
962
963 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
964 {
965 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
966 }
967
968 static int count_refspec_match(const char *pattern,
969 struct ref *refs,
970 struct ref **matched_ref)
971 {
972 int patlen = strlen(pattern);
973 struct ref *matched_weak = NULL;
974 struct ref *matched = NULL;
975 int weak_match = 0;
976 int match = 0;
977
978 for (weak_match = match = 0; refs; refs = refs->next) {
979 char *name = refs->name;
980 int namelen = strlen(name);
981
982 if (!refname_match(pattern, name, ref_rev_parse_rules))
983 continue;
984
985 /* A match is "weak" if it is with refs outside
986 * heads or tags, and did not specify the pattern
987 * in full (e.g. "refs/remotes/origin/master") or at
988 * least from the toplevel (e.g. "remotes/origin/master");
989 * otherwise "git push $URL master" would result in
990 * ambiguity between remotes/origin/master and heads/master
991 * at the remote site.
992 */
993 if (namelen != patlen &&
994 patlen != namelen - 5 &&
995 prefixcmp(name, "refs/heads/") &&
996 prefixcmp(name, "refs/tags/")) {
997 /* We want to catch the case where only weak
998 * matches are found and there are multiple
999 * matches, and where more than one strong
1000 * matches are found, as ambiguous. One
1001 * strong match with zero or more weak matches
1002 * are acceptable as a unique match.
1003 */
1004 matched_weak = refs;
1005 weak_match++;
1006 }
1007 else {
1008 matched = refs;
1009 match++;
1010 }
1011 }
1012 if (!matched) {
1013 *matched_ref = matched_weak;
1014 return weak_match;
1015 }
1016 else {
1017 *matched_ref = matched;
1018 return match;
1019 }
1020 }
1021
1022 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1023 {
1024 **tail = ref;
1025 while (ref->next)
1026 ref = ref->next;
1027 *tail = &ref->next;
1028 }
1029
1030 static struct ref *alloc_delete_ref(void)
1031 {
1032 struct ref *ref = alloc_ref("(delete)");
1033 hashclr(ref->new_sha1);
1034 return ref;
1035 }
1036
1037 static struct ref *try_explicit_object_name(const char *name)
1038 {
1039 unsigned char sha1[20];
1040 struct ref *ref;
1041
1042 if (!*name)
1043 return alloc_delete_ref();
1044 if (get_sha1(name, sha1))
1045 return NULL;
1046 ref = alloc_ref(name);
1047 hashcpy(ref->new_sha1, sha1);
1048 return ref;
1049 }
1050
1051 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1052 {
1053 struct ref *ret = alloc_ref(name);
1054 tail_link_ref(ret, tail);
1055 return ret;
1056 }
1057
1058 static char *guess_ref(const char *name, struct ref *peer)
1059 {
1060 struct strbuf buf = STRBUF_INIT;
1061 unsigned char sha1[20];
1062
1063 const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
1064 if (!r)
1065 return NULL;
1066
1067 if (!prefixcmp(r, "refs/heads/"))
1068 strbuf_addstr(&buf, "refs/heads/");
1069 else if (!prefixcmp(r, "refs/tags/"))
1070 strbuf_addstr(&buf, "refs/tags/");
1071 else
1072 return NULL;
1073
1074 strbuf_addstr(&buf, name);
1075 return strbuf_detach(&buf, NULL);
1076 }
1077
1078 static int match_explicit(struct ref *src, struct ref *dst,
1079 struct ref ***dst_tail,
1080 struct refspec *rs)
1081 {
1082 struct ref *matched_src, *matched_dst;
1083 int copy_src;
1084
1085 const char *dst_value = rs->dst;
1086 char *dst_guess;
1087
1088 if (rs->pattern || rs->matching)
1089 return 0;
1090
1091 matched_src = matched_dst = NULL;
1092 switch (count_refspec_match(rs->src, src, &matched_src)) {
1093 case 1:
1094 copy_src = 1;
1095 break;
1096 case 0:
1097 /* The source could be in the get_sha1() format
1098 * not a reference name. :refs/other is a
1099 * way to delete 'other' ref at the remote end.
1100 */
1101 matched_src = try_explicit_object_name(rs->src);
1102 if (!matched_src)
1103 return error("src refspec %s does not match any.", rs->src);
1104 copy_src = 0;
1105 break;
1106 default:
1107 return error("src refspec %s matches more than one.", rs->src);
1108 }
1109
1110 if (!dst_value) {
1111 unsigned char sha1[20];
1112 int flag;
1113
1114 dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
1115 if (!dst_value ||
1116 ((flag & REF_ISSYMREF) &&
1117 prefixcmp(dst_value, "refs/heads/")))
1118 die("%s cannot be resolved to branch.",
1119 matched_src->name);
1120 }
1121
1122 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1123 case 1:
1124 break;
1125 case 0:
1126 if (!memcmp(dst_value, "refs/", 5))
1127 matched_dst = make_linked_ref(dst_value, dst_tail);
1128 else if (is_null_sha1(matched_src->new_sha1))
1129 error("unable to delete '%s': remote ref does not exist",
1130 dst_value);
1131 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1132 matched_dst = make_linked_ref(dst_guess, dst_tail);
1133 else
1134 error("unable to push to unqualified destination: %s\n"
1135 "The destination refspec neither matches an "
1136 "existing ref on the remote nor\n"
1137 "begins with refs/, and we are unable to "
1138 "guess a prefix based on the source ref.",
1139 dst_value);
1140 break;
1141 default:
1142 matched_dst = NULL;
1143 error("dst refspec %s matches more than one.",
1144 dst_value);
1145 break;
1146 }
1147 if (!matched_dst)
1148 return -1;
1149 if (matched_dst->peer_ref)
1150 return error("dst ref %s receives from more than one src.",
1151 matched_dst->name);
1152 else {
1153 matched_dst->peer_ref = copy_src ? copy_ref(matched_src) : matched_src;
1154 matched_dst->force = rs->force;
1155 }
1156 return 0;
1157 }
1158
1159 static int match_explicit_refs(struct ref *src, struct ref *dst,
1160 struct ref ***dst_tail, struct refspec *rs,
1161 int rs_nr)
1162 {
1163 int i, errs;
1164 for (i = errs = 0; i < rs_nr; i++)
1165 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1166 return errs;
1167 }
1168
1169 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1170 int send_mirror, int direction, const struct refspec **ret_pat)
1171 {
1172 const struct refspec *pat;
1173 char *name;
1174 int i;
1175 int matching_refs = -1;
1176 for (i = 0; i < rs_nr; i++) {
1177 if (rs[i].matching &&
1178 (matching_refs == -1 || rs[i].force)) {
1179 matching_refs = i;
1180 continue;
1181 }
1182
1183 if (rs[i].pattern) {
1184 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1185 int match;
1186 if (direction == FROM_SRC)
1187 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1188 else
1189 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1190 if (match) {
1191 matching_refs = i;
1192 break;
1193 }
1194 }
1195 }
1196 if (matching_refs == -1)
1197 return NULL;
1198
1199 pat = rs + matching_refs;
1200 if (pat->matching) {
1201 /*
1202 * "matching refs"; traditionally we pushed everything
1203 * including refs outside refs/heads/ hierarchy, but
1204 * that does not make much sense these days.
1205 */
1206 if (!send_mirror && prefixcmp(ref->name, "refs/heads/"))
1207 return NULL;
1208 name = xstrdup(ref->name);
1209 }
1210 if (ret_pat)
1211 *ret_pat = pat;
1212 return name;
1213 }
1214
1215 static struct ref **tail_ref(struct ref **head)
1216 {
1217 struct ref **tail = head;
1218 while (*tail)
1219 tail = &((*tail)->next);
1220 return tail;
1221 }
1222
1223 struct tips {
1224 struct commit **tip;
1225 int nr, alloc;
1226 };
1227
1228 static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1229 {
1230 struct commit *commit;
1231
1232 if (is_null_sha1(sha1))
1233 return;
1234 commit = lookup_commit_reference_gently(sha1, 1);
1235 if (!commit || (commit->object.flags & TMP_MARK))
1236 return;
1237 commit->object.flags |= TMP_MARK;
1238 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1239 tips->tip[tips->nr++] = commit;
1240 }
1241
1242 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1243 {
1244 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1245 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1246 struct string_list_item *item;
1247 struct ref *ref;
1248 struct tips sent_tips;
1249
1250 /*
1251 * Collect everything we know they would have at the end of
1252 * this push, and collect all tags they have.
1253 */
1254 memset(&sent_tips, 0, sizeof(sent_tips));
1255 for (ref = *dst; ref; ref = ref->next) {
1256 if (ref->peer_ref &&
1257 !is_null_sha1(ref->peer_ref->new_sha1))
1258 add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1259 else
1260 add_to_tips(&sent_tips, ref->old_sha1);
1261 if (!prefixcmp(ref->name, "refs/tags/"))
1262 string_list_append(&dst_tag, ref->name);
1263 }
1264 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1265
1266 sort_string_list(&dst_tag);
1267
1268 /* Collect tags they do not have. */
1269 for (ref = src; ref; ref = ref->next) {
1270 if (prefixcmp(ref->name, "refs/tags/"))
1271 continue; /* not a tag */
1272 if (string_list_has_string(&dst_tag, ref->name))
1273 continue; /* they already have it */
1274 if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1275 continue; /* be conservative */
1276 item = string_list_append(&src_tag, ref->name);
1277 item->util = ref;
1278 }
1279 string_list_clear(&dst_tag, 0);
1280
1281 /*
1282 * At this point, src_tag lists tags that are missing from
1283 * dst, and sent_tips lists the tips we are pushing or those
1284 * that we know they already have. An element in the src_tag
1285 * that is an ancestor of any of the sent_tips needs to be
1286 * sent to the other side.
1287 */
1288 if (sent_tips.nr) {
1289 for_each_string_list_item(item, &src_tag) {
1290 struct ref *ref = item->util;
1291 struct ref *dst_ref;
1292 struct commit *commit;
1293
1294 if (is_null_sha1(ref->new_sha1))
1295 continue;
1296 commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1297 if (!commit)
1298 /* not pushing a commit, which is not an error */
1299 continue;
1300
1301 /*
1302 * Is this tag, which they do not have, reachable from
1303 * any of the commits we are sending?
1304 */
1305 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1306 continue;
1307
1308 /* Add it in */
1309 dst_ref = make_linked_ref(ref->name, dst_tail);
1310 hashcpy(dst_ref->new_sha1, ref->new_sha1);
1311 dst_ref->peer_ref = copy_ref(ref);
1312 }
1313 }
1314 string_list_clear(&src_tag, 0);
1315 free(sent_tips.tip);
1316 }
1317
1318 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1319 {
1320 for ( ; list; list = list->next)
1321 if (!strcmp(list->name, name))
1322 return (struct ref *)list;
1323 return NULL;
1324 }
1325
1326 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1327 {
1328 for ( ; ref; ref = ref->next)
1329 string_list_append_nodup(ref_index, ref->name)->util = ref;
1330
1331 sort_string_list(ref_index);
1332 }
1333
1334 /*
1335 * Given the set of refs the local repository has, the set of refs the
1336 * remote repository has, and the refspec used for push, determine
1337 * what remote refs we will update and with what value by setting
1338 * peer_ref (which object is being pushed) and force (if the push is
1339 * forced) in elements of "dst". The function may add new elements to
1340 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1341 */
1342 int match_push_refs(struct ref *src, struct ref **dst,
1343 int nr_refspec, const char **refspec, int flags)
1344 {
1345 struct refspec *rs;
1346 int send_all = flags & MATCH_REFS_ALL;
1347 int send_mirror = flags & MATCH_REFS_MIRROR;
1348 int send_prune = flags & MATCH_REFS_PRUNE;
1349 int errs;
1350 static const char *default_refspec[] = { ":", NULL };
1351 struct ref *ref, **dst_tail = tail_ref(dst);
1352 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1353
1354 if (!nr_refspec) {
1355 nr_refspec = 1;
1356 refspec = default_refspec;
1357 }
1358 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1359 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1360
1361 /* pick the remainder */
1362 for (ref = src; ref; ref = ref->next) {
1363 struct string_list_item *dst_item;
1364 struct ref *dst_peer;
1365 const struct refspec *pat = NULL;
1366 char *dst_name;
1367
1368 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1369 if (!dst_name)
1370 continue;
1371
1372 if (!dst_ref_index.nr)
1373 prepare_ref_index(&dst_ref_index, *dst);
1374
1375 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1376 dst_peer = dst_item ? dst_item->util : NULL;
1377 if (dst_peer) {
1378 if (dst_peer->peer_ref)
1379 /* We're already sending something to this ref. */
1380 goto free_name;
1381 } else {
1382 if (pat->matching && !(send_all || send_mirror))
1383 /*
1384 * Remote doesn't have it, and we have no
1385 * explicit pattern, and we don't have
1386 * --all nor --mirror.
1387 */
1388 goto free_name;
1389
1390 /* Create a new one and link it */
1391 dst_peer = make_linked_ref(dst_name, &dst_tail);
1392 hashcpy(dst_peer->new_sha1, ref->new_sha1);
1393 string_list_insert(&dst_ref_index,
1394 dst_peer->name)->util = dst_peer;
1395 }
1396 dst_peer->peer_ref = copy_ref(ref);
1397 dst_peer->force = pat->force;
1398 free_name:
1399 free(dst_name);
1400 }
1401
1402 string_list_clear(&dst_ref_index, 0);
1403
1404 if (flags & MATCH_REFS_FOLLOW_TAGS)
1405 add_missing_tags(src, dst, &dst_tail);
1406
1407 if (send_prune) {
1408 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1409 /* check for missing refs on the remote */
1410 for (ref = *dst; ref; ref = ref->next) {
1411 char *src_name;
1412
1413 if (ref->peer_ref)
1414 /* We're already sending something to this ref. */
1415 continue;
1416
1417 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1418 if (src_name) {
1419 if (!src_ref_index.nr)
1420 prepare_ref_index(&src_ref_index, src);
1421 if (!string_list_has_string(&src_ref_index,
1422 src_name))
1423 ref->peer_ref = alloc_delete_ref();
1424 free(src_name);
1425 }
1426 }
1427 string_list_clear(&src_ref_index, 0);
1428 }
1429 if (errs)
1430 return -1;
1431 return 0;
1432 }
1433
1434 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1435 int force_update)
1436 {
1437 struct ref *ref;
1438
1439 for (ref = remote_refs; ref; ref = ref->next) {
1440 int force_ref_update = ref->force || force_update;
1441 int reject_reason = 0;
1442
1443 if (ref->peer_ref)
1444 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1445 else if (!send_mirror)
1446 continue;
1447
1448 ref->deletion = is_null_sha1(ref->new_sha1);
1449 if (!ref->deletion &&
1450 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1451 ref->status = REF_STATUS_UPTODATE;
1452 continue;
1453 }
1454
1455 /*
1456 * Bypass the usual "must fast-forward" check but
1457 * replace it with a weaker "the old value must be
1458 * this value we observed". If the remote ref has
1459 * moved and is now different from what we expect,
1460 * reject any push.
1461 *
1462 * It also is an error if the user told us to check
1463 * with the remote-tracking branch to find the value
1464 * to expect, but we did not have such a tracking
1465 * branch.
1466 */
1467 if (ref->expect_old_sha1) {
1468 if (ref->expect_old_no_trackback ||
1469 hashcmp(ref->old_sha1, ref->old_sha1_expect))
1470 reject_reason = REF_STATUS_REJECT_STALE;
1471 }
1472
1473 /*
1474 * The usual "must fast-forward" rules.
1475 *
1476 * Decide whether an individual refspec A:B can be
1477 * pushed. The push will succeed if any of the
1478 * following are true:
1479 *
1480 * (1) the remote reference B does not exist
1481 *
1482 * (2) the remote reference B is being removed (i.e.,
1483 * pushing :B where no source is specified)
1484 *
1485 * (3) the destination is not under refs/tags/, and
1486 * if the old and new value is a commit, the new
1487 * is a descendant of the old.
1488 *
1489 * (4) it is forced using the +A:B notation, or by
1490 * passing the --force argument
1491 */
1492
1493 else if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
1494 if (!prefixcmp(ref->name, "refs/tags/"))
1495 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1496 else if (!has_sha1_file(ref->old_sha1))
1497 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1498 else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1499 !lookup_commit_reference_gently(ref->new_sha1, 1))
1500 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1501 else if (!ref_newer(ref->new_sha1, ref->old_sha1))
1502 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1503 }
1504
1505 /*
1506 * "--force" will defeat any rejection implemented
1507 * by the rules above.
1508 */
1509 if (!force_ref_update)
1510 ref->status = reject_reason;
1511 else if (reject_reason)
1512 ref->forced_update = 1;
1513 }
1514 }
1515
1516 struct branch *branch_get(const char *name)
1517 {
1518 struct branch *ret;
1519
1520 read_config();
1521 if (!name || !*name || !strcmp(name, "HEAD"))
1522 ret = current_branch;
1523 else
1524 ret = make_branch(name, 0);
1525 if (ret && ret->remote_name) {
1526 ret->remote = remote_get(ret->remote_name);
1527 if (ret->merge_nr) {
1528 int i;
1529 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1530 for (i = 0; i < ret->merge_nr; i++) {
1531 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1532 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1533 if (remote_find_tracking(ret->remote, ret->merge[i])
1534 && !strcmp(ret->remote_name, "."))
1535 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1536 }
1537 }
1538 }
1539 return ret;
1540 }
1541
1542 int branch_has_merge_config(struct branch *branch)
1543 {
1544 return branch && !!branch->merge;
1545 }
1546
1547 int branch_merge_matches(struct branch *branch,
1548 int i,
1549 const char *refname)
1550 {
1551 if (!branch || i < 0 || i >= branch->merge_nr)
1552 return 0;
1553 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
1554 }
1555
1556 static int ignore_symref_update(const char *refname)
1557 {
1558 unsigned char sha1[20];
1559 int flag;
1560
1561 if (!resolve_ref_unsafe(refname, sha1, 0, &flag))
1562 return 0; /* non-existing refs are OK */
1563 return (flag & REF_ISSYMREF);
1564 }
1565
1566 /*
1567 * Create and return a list of (struct ref) consisting of copies of
1568 * each remote_ref that matches refspec. refspec must be a pattern.
1569 * Fill in the copies' peer_ref to describe the local tracking refs to
1570 * which they map. Omit any references that would map to an existing
1571 * local symbolic ref.
1572 */
1573 static struct ref *get_expanded_map(const struct ref *remote_refs,
1574 const struct refspec *refspec)
1575 {
1576 const struct ref *ref;
1577 struct ref *ret = NULL;
1578 struct ref **tail = &ret;
1579
1580 for (ref = remote_refs; ref; ref = ref->next) {
1581 char *expn_name = NULL;
1582
1583 if (strchr(ref->name, '^'))
1584 continue; /* a dereference item */
1585 if (match_name_with_pattern(refspec->src, ref->name,
1586 refspec->dst, &expn_name) &&
1587 !ignore_symref_update(expn_name)) {
1588 struct ref *cpy = copy_ref(ref);
1589
1590 cpy->peer_ref = alloc_ref(expn_name);
1591 if (refspec->force)
1592 cpy->peer_ref->force = 1;
1593 *tail = cpy;
1594 tail = &cpy->next;
1595 }
1596 free(expn_name);
1597 }
1598
1599 return ret;
1600 }
1601
1602 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1603 {
1604 const struct ref *ref;
1605 for (ref = refs; ref; ref = ref->next) {
1606 if (refname_match(name, ref->name, ref_fetch_rules))
1607 return ref;
1608 }
1609 return NULL;
1610 }
1611
1612 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1613 {
1614 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1615
1616 if (!ref)
1617 return NULL;
1618
1619 return copy_ref(ref);
1620 }
1621
1622 static struct ref *get_local_ref(const char *name)
1623 {
1624 if (!name || name[0] == '\0')
1625 return NULL;
1626
1627 if (!prefixcmp(name, "refs/"))
1628 return alloc_ref(name);
1629
1630 if (!prefixcmp(name, "heads/") ||
1631 !prefixcmp(name, "tags/") ||
1632 !prefixcmp(name, "remotes/"))
1633 return alloc_ref_with_prefix("refs/", 5, name);
1634
1635 return alloc_ref_with_prefix("refs/heads/", 11, name);
1636 }
1637
1638 int get_fetch_map(const struct ref *remote_refs,
1639 const struct refspec *refspec,
1640 struct ref ***tail,
1641 int missing_ok)
1642 {
1643 struct ref *ref_map, **rmp;
1644
1645 if (refspec->pattern) {
1646 ref_map = get_expanded_map(remote_refs, refspec);
1647 } else {
1648 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1649
1650 if (refspec->exact_sha1) {
1651 ref_map = alloc_ref(name);
1652 get_sha1_hex(name, ref_map->old_sha1);
1653 } else {
1654 ref_map = get_remote_ref(remote_refs, name);
1655 }
1656 if (!missing_ok && !ref_map)
1657 die("Couldn't find remote ref %s", name);
1658 if (ref_map) {
1659 ref_map->peer_ref = get_local_ref(refspec->dst);
1660 if (ref_map->peer_ref && refspec->force)
1661 ref_map->peer_ref->force = 1;
1662 }
1663 }
1664
1665 for (rmp = &ref_map; *rmp; ) {
1666 if ((*rmp)->peer_ref) {
1667 if (prefixcmp((*rmp)->peer_ref->name, "refs/") ||
1668 check_refname_format((*rmp)->peer_ref->name, 0)) {
1669 struct ref *ignore = *rmp;
1670 error("* Ignoring funny ref '%s' locally",
1671 (*rmp)->peer_ref->name);
1672 *rmp = (*rmp)->next;
1673 free(ignore->peer_ref);
1674 free(ignore);
1675 continue;
1676 }
1677 }
1678 rmp = &((*rmp)->next);
1679 }
1680
1681 if (ref_map)
1682 tail_link_ref(ref_map, tail);
1683
1684 return 0;
1685 }
1686
1687 int resolve_remote_symref(struct ref *ref, struct ref *list)
1688 {
1689 if (!ref->symref)
1690 return 0;
1691 for (; list; list = list->next)
1692 if (!strcmp(ref->symref, list->name)) {
1693 hashcpy(ref->old_sha1, list->old_sha1);
1694 return 0;
1695 }
1696 return 1;
1697 }
1698
1699 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1700 {
1701 while (list) {
1702 struct commit_list *temp = list;
1703 temp->item->object.flags &= ~mark;
1704 list = temp->next;
1705 free(temp);
1706 }
1707 }
1708
1709 int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1710 {
1711 struct object *o;
1712 struct commit *old, *new;
1713 struct commit_list *list, *used;
1714 int found = 0;
1715
1716 /*
1717 * Both new and old must be commit-ish and new is descendant of
1718 * old. Otherwise we require --force.
1719 */
1720 o = deref_tag(parse_object(old_sha1), NULL, 0);
1721 if (!o || o->type != OBJ_COMMIT)
1722 return 0;
1723 old = (struct commit *) o;
1724
1725 o = deref_tag(parse_object(new_sha1), NULL, 0);
1726 if (!o || o->type != OBJ_COMMIT)
1727 return 0;
1728 new = (struct commit *) o;
1729
1730 if (parse_commit(new) < 0)
1731 return 0;
1732
1733 used = list = NULL;
1734 commit_list_insert(new, &list);
1735 while (list) {
1736 new = pop_most_recent_commit(&list, TMP_MARK);
1737 commit_list_insert(new, &used);
1738 if (new == old) {
1739 found = 1;
1740 break;
1741 }
1742 }
1743 unmark_and_free(list, TMP_MARK);
1744 unmark_and_free(used, TMP_MARK);
1745 return found;
1746 }
1747
1748 /*
1749 * Compare a branch with its upstream, and save their differences (number
1750 * of commits) in *num_ours and *num_theirs.
1751 *
1752 * Return 0 if branch has no upstream (no base), -1 if upstream is missing
1753 * (with "gone" base), otherwise 1 (with base).
1754 */
1755 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1756 {
1757 unsigned char sha1[20];
1758 struct commit *ours, *theirs;
1759 char symmetric[84];
1760 struct rev_info revs;
1761 const char *rev_argv[10], *base;
1762 int rev_argc;
1763
1764 /* Cannot stat unless we are marked to build on top of somebody else. */
1765 if (!branch ||
1766 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1767 return 0;
1768
1769 /* Cannot stat if what we used to build on no longer exists */
1770 base = branch->merge[0]->dst;
1771 if (read_ref(base, sha1))
1772 return -1;
1773 theirs = lookup_commit_reference(sha1);
1774 if (!theirs)
1775 return -1;
1776
1777 if (read_ref(branch->refname, sha1))
1778 return -1;
1779 ours = lookup_commit_reference(sha1);
1780 if (!ours)
1781 return -1;
1782
1783 /* are we the same? */
1784 if (theirs == ours) {
1785 *num_theirs = *num_ours = 0;
1786 return 1;
1787 }
1788
1789 /* Run "rev-list --left-right ours...theirs" internally... */
1790 rev_argc = 0;
1791 rev_argv[rev_argc++] = NULL;
1792 rev_argv[rev_argc++] = "--left-right";
1793 rev_argv[rev_argc++] = symmetric;
1794 rev_argv[rev_argc++] = "--";
1795 rev_argv[rev_argc] = NULL;
1796
1797 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1798 strcpy(symmetric + 40, "...");
1799 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1800
1801 init_revisions(&revs, NULL);
1802 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1803 prepare_revision_walk(&revs);
1804
1805 /* ... and count the commits on each side. */
1806 *num_ours = 0;
1807 *num_theirs = 0;
1808 while (1) {
1809 struct commit *c = get_revision(&revs);
1810 if (!c)
1811 break;
1812 if (c->object.flags & SYMMETRIC_LEFT)
1813 (*num_ours)++;
1814 else
1815 (*num_theirs)++;
1816 }
1817
1818 /* clear object flags smudged by the above traversal */
1819 clear_commit_marks(ours, ALL_REV_FLAGS);
1820 clear_commit_marks(theirs, ALL_REV_FLAGS);
1821 return 1;
1822 }
1823
1824 /*
1825 * Return true when there is anything to report, otherwise false.
1826 */
1827 int format_tracking_info(struct branch *branch, struct strbuf *sb)
1828 {
1829 int ours, theirs;
1830 const char *base;
1831 int upstream_is_gone = 0;
1832
1833 switch (stat_tracking_info(branch, &ours, &theirs)) {
1834 case 0:
1835 /* no base */
1836 return 0;
1837 case -1:
1838 /* with "gone" base */
1839 upstream_is_gone = 1;
1840 break;
1841 default:
1842 /* with base */
1843 break;
1844 }
1845
1846 base = branch->merge[0]->dst;
1847 base = shorten_unambiguous_ref(base, 0);
1848 if (upstream_is_gone) {
1849 strbuf_addf(sb,
1850 _("Your branch is based on '%s', but the upstream is gone.\n"),
1851 base);
1852 if (advice_status_hints)
1853 strbuf_addf(sb,
1854 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
1855 } else if (!ours && !theirs) {
1856 strbuf_addf(sb,
1857 _("Your branch is up-to-date with '%s'.\n"),
1858 base);
1859 } else if (!theirs) {
1860 strbuf_addf(sb,
1861 Q_("Your branch is ahead of '%s' by %d commit.\n",
1862 "Your branch is ahead of '%s' by %d commits.\n",
1863 ours),
1864 base, ours);
1865 if (advice_status_hints)
1866 strbuf_addf(sb,
1867 _(" (use \"git push\" to publish your local commits)\n"));
1868 } else if (!ours) {
1869 strbuf_addf(sb,
1870 Q_("Your branch is behind '%s' by %d commit, "
1871 "and can be fast-forwarded.\n",
1872 "Your branch is behind '%s' by %d commits, "
1873 "and can be fast-forwarded.\n",
1874 theirs),
1875 base, theirs);
1876 if (advice_status_hints)
1877 strbuf_addf(sb,
1878 _(" (use \"git pull\" to update your local branch)\n"));
1879 } else {
1880 strbuf_addf(sb,
1881 Q_("Your branch and '%s' have diverged,\n"
1882 "and have %d and %d different commit each, "
1883 "respectively.\n",
1884 "Your branch and '%s' have diverged,\n"
1885 "and have %d and %d different commits each, "
1886 "respectively.\n",
1887 theirs),
1888 base, ours, theirs);
1889 if (advice_status_hints)
1890 strbuf_addf(sb,
1891 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
1892 }
1893 return 1;
1894 }
1895
1896 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1897 {
1898 struct ref ***local_tail = cb_data;
1899 struct ref *ref;
1900 int len;
1901
1902 /* we already know it starts with refs/ to get here */
1903 if (check_refname_format(refname + 5, 0))
1904 return 0;
1905
1906 len = strlen(refname) + 1;
1907 ref = xcalloc(1, sizeof(*ref) + len);
1908 hashcpy(ref->new_sha1, sha1);
1909 memcpy(ref->name, refname, len);
1910 **local_tail = ref;
1911 *local_tail = &ref->next;
1912 return 0;
1913 }
1914
1915 struct ref *get_local_heads(void)
1916 {
1917 struct ref *local_refs = NULL, **local_tail = &local_refs;
1918 for_each_ref(one_local_ref, &local_tail);
1919 return local_refs;
1920 }
1921
1922 struct ref *guess_remote_head(const struct ref *head,
1923 const struct ref *refs,
1924 int all)
1925 {
1926 const struct ref *r;
1927 struct ref *list = NULL;
1928 struct ref **tail = &list;
1929
1930 if (!head)
1931 return NULL;
1932
1933 /*
1934 * Some transports support directly peeking at
1935 * where HEAD points; if that is the case, then
1936 * we don't have to guess.
1937 */
1938 if (head->symref)
1939 return copy_ref(find_ref_by_name(refs, head->symref));
1940
1941 /* If refs/heads/master could be right, it is. */
1942 if (!all) {
1943 r = find_ref_by_name(refs, "refs/heads/master");
1944 if (r && !hashcmp(r->old_sha1, head->old_sha1))
1945 return copy_ref(r);
1946 }
1947
1948 /* Look for another ref that points there */
1949 for (r = refs; r; r = r->next) {
1950 if (r != head &&
1951 !prefixcmp(r->name, "refs/heads/") &&
1952 !hashcmp(r->old_sha1, head->old_sha1)) {
1953 *tail = copy_ref(r);
1954 tail = &((*tail)->next);
1955 if (!all)
1956 break;
1957 }
1958 }
1959
1960 return list;
1961 }
1962
1963 struct stale_heads_info {
1964 struct string_list *ref_names;
1965 struct ref **stale_refs_tail;
1966 struct refspec *refs;
1967 int ref_count;
1968 };
1969
1970 static int get_stale_heads_cb(const char *refname,
1971 const unsigned char *sha1, int flags, void *cb_data)
1972 {
1973 struct stale_heads_info *info = cb_data;
1974 struct refspec query;
1975 memset(&query, 0, sizeof(struct refspec));
1976 query.dst = (char *)refname;
1977
1978 if (query_refspecs(info->refs, info->ref_count, &query))
1979 return 0; /* No matches */
1980
1981 /*
1982 * If we did find a suitable refspec and it's not a symref and
1983 * it's not in the list of refs that currently exist in that
1984 * remote we consider it to be stale.
1985 */
1986 if (!((flags & REF_ISSYMREF) ||
1987 string_list_has_string(info->ref_names, query.src))) {
1988 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
1989 hashcpy(ref->new_sha1, sha1);
1990 }
1991
1992 free(query.src);
1993 return 0;
1994 }
1995
1996 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
1997 {
1998 struct ref *ref, *stale_refs = NULL;
1999 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2000 struct stale_heads_info info;
2001 info.ref_names = &ref_names;
2002 info.stale_refs_tail = &stale_refs;
2003 info.refs = refs;
2004 info.ref_count = ref_count;
2005 for (ref = fetch_map; ref; ref = ref->next)
2006 string_list_append(&ref_names, ref->name);
2007 sort_string_list(&ref_names);
2008 for_each_ref(get_stale_heads_cb, &info);
2009 string_list_clear(&ref_names, 0);
2010 return stale_refs;
2011 }
2012
2013 /*
2014 * Compare-and-swap
2015 */
2016 void clear_cas_option(struct push_cas_option *cas)
2017 {
2018 int i;
2019
2020 for (i = 0; i < cas->nr; i++)
2021 free(cas->entry[i].refname);
2022 free(cas->entry);
2023 memset(cas, 0, sizeof(*cas));
2024 }
2025
2026 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2027 const char *refname,
2028 size_t refnamelen)
2029 {
2030 struct push_cas *entry;
2031 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2032 entry = &cas->entry[cas->nr++];
2033 memset(entry, 0, sizeof(*entry));
2034 entry->refname = xmemdupz(refname, refnamelen);
2035 return entry;
2036 }
2037
2038 int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2039 {
2040 const char *colon;
2041 struct push_cas *entry;
2042
2043 if (unset) {
2044 /* "--no-<option>" */
2045 clear_cas_option(cas);
2046 return 0;
2047 }
2048
2049 if (!arg) {
2050 /* just "--<option>" */
2051 cas->use_tracking_for_rest = 1;
2052 return 0;
2053 }
2054
2055 /* "--<option>=refname" or "--<option>=refname:value" */
2056 colon = strchrnul(arg, ':');
2057 entry = add_cas_entry(cas, arg, colon - arg);
2058 if (!*colon)
2059 entry->use_tracking = 1;
2060 else if (get_sha1(colon + 1, entry->expect))
2061 return error("cannot parse expected object name '%s'", colon + 1);
2062 return 0;
2063 }
2064
2065 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2066 {
2067 return parse_push_cas_option(opt->value, arg, unset);
2068 }
2069
2070 int is_empty_cas(const struct push_cas_option *cas)
2071 {
2072 return !cas->use_tracking_for_rest && !cas->nr;
2073 }
2074
2075 /*
2076 * Look at remote.fetch refspec and see if we have a remote
2077 * tracking branch for the refname there. Fill its current
2078 * value in sha1[].
2079 * If we cannot do so, return negative to signal an error.
2080 */
2081 static int remote_tracking(struct remote *remote, const char *refname,
2082 unsigned char sha1[20])
2083 {
2084 char *dst;
2085
2086 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2087 if (!dst)
2088 return -1; /* no tracking ref for refname at remote */
2089 if (read_ref(dst, sha1))
2090 return -1; /* we know what the tracking ref is but we cannot read it */
2091 return 0;
2092 }
2093
2094 static void apply_cas(struct push_cas_option *cas,
2095 struct remote *remote,
2096 struct ref *ref)
2097 {
2098 int i;
2099
2100 /* Find an explicit --<option>=<name>[:<value>] entry */
2101 for (i = 0; i < cas->nr; i++) {
2102 struct push_cas *entry = &cas->entry[i];
2103 if (!refname_match(entry->refname, ref->name, ref_rev_parse_rules))
2104 continue;
2105 ref->expect_old_sha1 = 1;
2106 if (!entry->use_tracking)
2107 hashcpy(ref->old_sha1_expect, cas->entry[i].expect);
2108 else if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2109 ref->expect_old_no_trackback = 1;
2110 return;
2111 }
2112
2113 /* Are we using "--<option>" to cover all? */
2114 if (!cas->use_tracking_for_rest)
2115 return;
2116
2117 ref->expect_old_sha1 = 1;
2118 if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2119 ref->expect_old_no_trackback = 1;
2120 }
2121
2122 void apply_push_cas(struct push_cas_option *cas,
2123 struct remote *remote,
2124 struct ref *remote_refs)
2125 {
2126 struct ref *ref;
2127 for (ref = remote_refs; ref; ref = ref->next)
2128 apply_cas(cas, remote, ref);
2129 }
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