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merge-recursive: convert malloc / strcpy to strbuf
[git/debian.git] / remote.c
bloba01f13a211c74900e65b40e16406402cf8cf41f7
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 static struct hashmap remotes_hash;
46
47 static struct branch **branches;
48 static int branches_alloc;
49 static int branches_nr;
50
51 static struct branch *current_branch;
52 static const char *pushremote_name;
53
54 static struct rewrites rewrites;
55 static struct rewrites rewrites_push;
56
57 static int valid_remote(const struct remote *remote)
58 {
59 return (!!remote->url) || (!!remote->foreign_vcs);
60 }
61
62 static const char *alias_url(const char *url, struct rewrites *r)
63 {
64 int i, j;
65 struct counted_string *longest;
66 int longest_i;
67
68 longest = NULL;
69 longest_i = -1;
70 for (i = 0; i < r->rewrite_nr; i++) {
71 if (!r->rewrite[i])
72 continue;
73 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
74 if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
75 (!longest ||
76 longest->len < r->rewrite[i]->instead_of[j].len)) {
77 longest = &(r->rewrite[i]->instead_of[j]);
78 longest_i = i;
79 }
80 }
81 }
82 if (!longest)
83 return url;
84
85 return xstrfmt("%s%s", r->rewrite[longest_i]->base, url + longest->len);
86 }
87
88 static void add_push_refspec(struct remote *remote, const char *ref)
89 {
90 ALLOC_GROW(remote->push_refspec,
91 remote->push_refspec_nr + 1,
92 remote->push_refspec_alloc);
93 remote->push_refspec[remote->push_refspec_nr++] = ref;
94 }
95
96 static void add_fetch_refspec(struct remote *remote, const char *ref)
97 {
98 ALLOC_GROW(remote->fetch_refspec,
99 remote->fetch_refspec_nr + 1,
100 remote->fetch_refspec_alloc);
101 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
102 }
103
104 static void add_url(struct remote *remote, const char *url)
105 {
106 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
107 remote->url[remote->url_nr++] = url;
108 }
109
110 static void add_pushurl(struct remote *remote, const char *pushurl)
111 {
112 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
113 remote->pushurl[remote->pushurl_nr++] = pushurl;
114 }
115
116 static void add_pushurl_alias(struct remote *remote, const char *url)
117 {
118 const char *pushurl = alias_url(url, &rewrites_push);
119 if (pushurl != url)
120 add_pushurl(remote, pushurl);
121 }
122
123 static void add_url_alias(struct remote *remote, const char *url)
124 {
125 add_url(remote, alias_url(url, &rewrites));
126 add_pushurl_alias(remote, url);
127 }
128
129 struct remotes_hash_key {
130 const char *str;
131 int len;
132 };
133
134 static int remotes_hash_cmp(const struct remote *a, const struct remote *b, const struct remotes_hash_key *key)
135 {
136 if (key)
137 return strncmp(a->name, key->str, key->len) || a->name[key->len];
138 else
139 return strcmp(a->name, b->name);
140 }
141
142 static inline void init_remotes_hash(void)
143 {
144 if (!remotes_hash.cmpfn)
145 hashmap_init(&remotes_hash, (hashmap_cmp_fn)remotes_hash_cmp, 0);
146 }
147
148 static struct remote *make_remote(const char *name, int len)
149 {
150 struct remote *ret, *replaced;
151 struct remotes_hash_key lookup;
152 struct hashmap_entry lookup_entry;
153
154 if (!len)
155 len = strlen(name);
156
157 init_remotes_hash();
158 lookup.str = name;
159 lookup.len = len;
160 hashmap_entry_init(&lookup_entry, memhash(name, len));
161
162 if ((ret = hashmap_get(&remotes_hash, &lookup_entry, &lookup)) != NULL)
163 return ret;
164
165 ret = xcalloc(1, sizeof(struct remote));
166 ret->prune = -1; /* unspecified */
167 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
168 remotes[remotes_nr++] = ret;
169 ret->name = xstrndup(name, len);
170
171 hashmap_entry_init(ret, lookup_entry.hash);
172 replaced = hashmap_put(&remotes_hash, ret);
173 assert(replaced == NULL); /* no previous entry overwritten */
174 return ret;
175 }
176
177 static void add_merge(struct branch *branch, const char *name)
178 {
179 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
180 branch->merge_alloc);
181 branch->merge_name[branch->merge_nr++] = name;
182 }
183
184 static struct branch *make_branch(const char *name, int len)
185 {
186 struct branch *ret;
187 int i;
188
189 for (i = 0; i < branches_nr; i++) {
190 if (len ? (!strncmp(name, branches[i]->name, len) &&
191 !branches[i]->name[len]) :
192 !strcmp(name, branches[i]->name))
193 return branches[i];
194 }
195
196 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
197 ret = xcalloc(1, sizeof(struct branch));
198 branches[branches_nr++] = ret;
199 if (len)
200 ret->name = xstrndup(name, len);
201 else
202 ret->name = xstrdup(name);
203 ret->refname = xstrfmt("refs/heads/%s", ret->name);
204
205 return ret;
206 }
207
208 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
209 {
210 struct rewrite *ret;
211 int i;
212
213 for (i = 0; i < r->rewrite_nr; i++) {
214 if (len
215 ? (len == r->rewrite[i]->baselen &&
216 !strncmp(base, r->rewrite[i]->base, len))
217 : !strcmp(base, r->rewrite[i]->base))
218 return r->rewrite[i];
219 }
220
221 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
222 ret = xcalloc(1, sizeof(struct rewrite));
223 r->rewrite[r->rewrite_nr++] = ret;
224 if (len) {
225 ret->base = xstrndup(base, len);
226 ret->baselen = len;
227 }
228 else {
229 ret->base = xstrdup(base);
230 ret->baselen = strlen(base);
231 }
232 return ret;
233 }
234
235 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
236 {
237 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
238 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
239 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
240 rewrite->instead_of_nr++;
241 }
242
243 static const char *skip_spaces(const char *s)
244 {
245 while (isspace(*s))
246 s++;
247 return s;
248 }
249
250 static void read_remotes_file(struct remote *remote)
251 {
252 struct strbuf buf = STRBUF_INIT;
253 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
254
255 if (!f)
256 return;
257 remote->origin = REMOTE_REMOTES;
258 while (strbuf_getline(&buf, f, '\n') != EOF) {
259 const char *v;
260
261 strbuf_rtrim(&buf);
262
263 if (skip_prefix(buf.buf, "URL:", &v))
264 add_url_alias(remote, xstrdup(skip_spaces(v)));
265 else if (skip_prefix(buf.buf, "Push:", &v))
266 add_push_refspec(remote, xstrdup(skip_spaces(v)));
267 else if (skip_prefix(buf.buf, "Pull:", &v))
268 add_fetch_refspec(remote, xstrdup(skip_spaces(v)));
269 }
270 strbuf_release(&buf);
271 fclose(f);
272 }
273
274 static void read_branches_file(struct remote *remote)
275 {
276 char *frag;
277 struct strbuf buf = STRBUF_INIT;
278 FILE *f = fopen(git_path("branches/%s", remote->name), "r");
279
280 if (!f)
281 return;
282
283 strbuf_getline(&buf, f, '\n');
284 strbuf_trim(&buf);
285 if (!buf.len) {
286 strbuf_release(&buf);
287 return;
288 }
289
290 remote->origin = REMOTE_BRANCHES;
291
292 /*
293 * The branches file would have URL and optionally
294 * #branch specified. The "master" (or specified) branch is
295 * fetched and stored in the local branch matching the
296 * remote name.
297 */
298 frag = strchr(buf.buf, '#');
299 if (frag)
300 *(frag++) = '\0';
301 else
302 frag = "master";
303
304 add_url_alias(remote, strbuf_detach(&buf, NULL));
305 add_fetch_refspec(remote, xstrfmt("refs/heads/%s:refs/heads/%s",
306 frag, remote->name));
307
308 /*
309 * Cogito compatible push: push current HEAD to remote #branch
310 * (master if missing)
311 */
312 add_push_refspec(remote, xstrfmt("HEAD:refs/heads/%s", frag));
313 remote->fetch_tags = 1; /* always auto-follow */
314 }
315
316 static int handle_config(const char *key, const char *value, void *cb)
317 {
318 const char *name;
319 const char *subkey;
320 struct remote *remote;
321 struct branch *branch;
322 if (starts_with(key, "branch.")) {
323 name = key + 7;
324 subkey = strrchr(name, '.');
325 if (!subkey)
326 return 0;
327 branch = make_branch(name, subkey - name);
328 if (!strcmp(subkey, ".remote")) {
329 return git_config_string(&branch->remote_name, key, value);
330 } else if (!strcmp(subkey, ".pushremote")) {
331 return git_config_string(&branch->pushremote_name, key, value);
332 } else if (!strcmp(subkey, ".merge")) {
333 if (!value)
334 return config_error_nonbool(key);
335 add_merge(branch, xstrdup(value));
336 }
337 return 0;
338 }
339 if (starts_with(key, "url.")) {
340 struct rewrite *rewrite;
341 name = key + 4;
342 subkey = strrchr(name, '.');
343 if (!subkey)
344 return 0;
345 if (!strcmp(subkey, ".insteadof")) {
346 rewrite = make_rewrite(&rewrites, name, subkey - name);
347 if (!value)
348 return config_error_nonbool(key);
349 add_instead_of(rewrite, xstrdup(value));
350 } else if (!strcmp(subkey, ".pushinsteadof")) {
351 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
352 if (!value)
353 return config_error_nonbool(key);
354 add_instead_of(rewrite, xstrdup(value));
355 }
356 }
357
358 if (!starts_with(key, "remote."))
359 return 0;
360 name = key + 7;
361
362 /* Handle remote.* variables */
363 if (!strcmp(name, "pushdefault"))
364 return git_config_string(&pushremote_name, key, value);
365
366 /* Handle remote.<name>.* variables */
367 if (*name == '/') {
368 warning("Config remote shorthand cannot begin with '/': %s",
369 name);
370 return 0;
371 }
372 subkey = strrchr(name, '.');
373 if (!subkey)
374 return 0;
375 remote = make_remote(name, subkey - name);
376 remote->origin = REMOTE_CONFIG;
377 if (!strcmp(subkey, ".mirror"))
378 remote->mirror = git_config_bool(key, value);
379 else if (!strcmp(subkey, ".skipdefaultupdate"))
380 remote->skip_default_update = git_config_bool(key, value);
381 else if (!strcmp(subkey, ".skipfetchall"))
382 remote->skip_default_update = git_config_bool(key, value);
383 else if (!strcmp(subkey, ".prune"))
384 remote->prune = git_config_bool(key, value);
385 else if (!strcmp(subkey, ".url")) {
386 const char *v;
387 if (git_config_string(&v, key, value))
388 return -1;
389 add_url(remote, v);
390 } else if (!strcmp(subkey, ".pushurl")) {
391 const char *v;
392 if (git_config_string(&v, key, value))
393 return -1;
394 add_pushurl(remote, v);
395 } else if (!strcmp(subkey, ".push")) {
396 const char *v;
397 if (git_config_string(&v, key, value))
398 return -1;
399 add_push_refspec(remote, v);
400 } else if (!strcmp(subkey, ".fetch")) {
401 const char *v;
402 if (git_config_string(&v, key, value))
403 return -1;
404 add_fetch_refspec(remote, v);
405 } else if (!strcmp(subkey, ".receivepack")) {
406 const char *v;
407 if (git_config_string(&v, key, value))
408 return -1;
409 if (!remote->receivepack)
410 remote->receivepack = v;
411 else
412 error("more than one receivepack given, using the first");
413 } else if (!strcmp(subkey, ".uploadpack")) {
414 const char *v;
415 if (git_config_string(&v, key, value))
416 return -1;
417 if (!remote->uploadpack)
418 remote->uploadpack = v;
419 else
420 error("more than one uploadpack given, using the first");
421 } else if (!strcmp(subkey, ".tagopt")) {
422 if (!strcmp(value, "--no-tags"))
423 remote->fetch_tags = -1;
424 else if (!strcmp(value, "--tags"))
425 remote->fetch_tags = 2;
426 } else if (!strcmp(subkey, ".proxy")) {
427 return git_config_string((const char **)&remote->http_proxy,
428 key, value);
429 } else if (!strcmp(subkey, ".vcs")) {
430 return git_config_string(&remote->foreign_vcs, key, value);
431 }
432 return 0;
433 }
434
435 static void alias_all_urls(void)
436 {
437 int i, j;
438 for (i = 0; i < remotes_nr; i++) {
439 int add_pushurl_aliases;
440 if (!remotes[i])
441 continue;
442 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
443 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
444 }
445 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
446 for (j = 0; j < remotes[i]->url_nr; j++) {
447 if (add_pushurl_aliases)
448 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
449 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
450 }
451 }
452 }
453
454 static void read_config(void)
455 {
456 static int loaded;
457 unsigned char sha1[20];
458 const char *head_ref;
459 int flag;
460
461 if (loaded)
462 return;
463 loaded = 1;
464
465 current_branch = NULL;
466 head_ref = resolve_ref_unsafe("HEAD", 0, sha1, &flag);
467 if (head_ref && (flag & REF_ISSYMREF) &&
468 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
469 current_branch = make_branch(head_ref, 0);
470 }
471 git_config(handle_config, NULL);
472 alias_all_urls();
473 }
474
475 /*
476 * This function frees a refspec array.
477 * Warning: code paths should be checked to ensure that the src
478 * and dst pointers are always freeable pointers as well
479 * as the refspec pointer itself.
480 */
481 static void free_refspecs(struct refspec *refspec, int nr_refspec)
482 {
483 int i;
484
485 if (!refspec)
486 return;
487
488 for (i = 0; i < nr_refspec; i++) {
489 free(refspec[i].src);
490 free(refspec[i].dst);
491 }
492 free(refspec);
493 }
494
495 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
496 {
497 int i;
498 struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
499
500 for (i = 0; i < nr_refspec; i++) {
501 size_t llen;
502 int is_glob;
503 const char *lhs, *rhs;
504 int flags;
505
506 is_glob = 0;
507
508 lhs = refspec[i];
509 if (*lhs == '+') {
510 rs[i].force = 1;
511 lhs++;
512 }
513
514 rhs = strrchr(lhs, ':');
515
516 /*
517 * Before going on, special case ":" (or "+:") as a refspec
518 * for pushing matching refs.
519 */
520 if (!fetch && rhs == lhs && rhs[1] == '\0') {
521 rs[i].matching = 1;
522 continue;
523 }
524
525 if (rhs) {
526 size_t rlen = strlen(++rhs);
527 is_glob = (1 <= rlen && strchr(rhs, '*'));
528 rs[i].dst = xstrndup(rhs, rlen);
529 }
530
531 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
532 if (1 <= llen && memchr(lhs, '*', llen)) {
533 if ((rhs && !is_glob) || (!rhs && fetch))
534 goto invalid;
535 is_glob = 1;
536 } else if (rhs && is_glob) {
537 goto invalid;
538 }
539
540 rs[i].pattern = is_glob;
541 rs[i].src = xstrndup(lhs, llen);
542 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
543
544 if (fetch) {
545 unsigned char unused[40];
546
547 /* LHS */
548 if (!*rs[i].src)
549 ; /* empty is ok; it means "HEAD" */
550 else if (llen == 40 && !get_sha1_hex(rs[i].src, unused))
551 rs[i].exact_sha1 = 1; /* ok */
552 else if (!check_refname_format(rs[i].src, flags))
553 ; /* valid looking ref is ok */
554 else
555 goto invalid;
556 /* RHS */
557 if (!rs[i].dst)
558 ; /* missing is ok; it is the same as empty */
559 else if (!*rs[i].dst)
560 ; /* empty is ok; it means "do not store" */
561 else if (!check_refname_format(rs[i].dst, flags))
562 ; /* valid looking ref is ok */
563 else
564 goto invalid;
565 } else {
566 /*
567 * LHS
568 * - empty is allowed; it means delete.
569 * - when wildcarded, it must be a valid looking ref.
570 * - otherwise, it must be an extended SHA-1, but
571 * there is no existing way to validate this.
572 */
573 if (!*rs[i].src)
574 ; /* empty is ok */
575 else if (is_glob) {
576 if (check_refname_format(rs[i].src, flags))
577 goto invalid;
578 }
579 else
580 ; /* anything goes, for now */
581 /*
582 * RHS
583 * - missing is allowed, but LHS then must be a
584 * valid looking ref.
585 * - empty is not allowed.
586 * - otherwise it must be a valid looking ref.
587 */
588 if (!rs[i].dst) {
589 if (check_refname_format(rs[i].src, flags))
590 goto invalid;
591 } else if (!*rs[i].dst) {
592 goto invalid;
593 } else {
594 if (check_refname_format(rs[i].dst, flags))
595 goto invalid;
596 }
597 }
598 }
599 return rs;
600
601 invalid:
602 if (verify) {
603 /*
604 * nr_refspec must be greater than zero and i must be valid
605 * since it is only possible to reach this point from within
606 * the for loop above.
607 */
608 free_refspecs(rs, i+1);
609 return NULL;
610 }
611 die("Invalid refspec '%s'", refspec[i]);
612 }
613
614 int valid_fetch_refspec(const char *fetch_refspec_str)
615 {
616 struct refspec *refspec;
617
618 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
619 free_refspecs(refspec, 1);
620 return !!refspec;
621 }
622
623 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
624 {
625 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
626 }
627
628 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
629 {
630 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
631 }
632
633 void free_refspec(int nr_refspec, struct refspec *refspec)
634 {
635 int i;
636 for (i = 0; i < nr_refspec; i++) {
637 free(refspec[i].src);
638 free(refspec[i].dst);
639 }
640 free(refspec);
641 }
642
643 static int valid_remote_nick(const char *name)
644 {
645 if (!name[0] || is_dot_or_dotdot(name))
646 return 0;
647 return !strchr(name, '/'); /* no slash */
648 }
649
650 const char *remote_for_branch(struct branch *branch, int *explicit)
651 {
652 if (branch && branch->remote_name) {
653 if (explicit)
654 *explicit = 1;
655 return branch->remote_name;
656 }
657 if (explicit)
658 *explicit = 0;
659 return "origin";
660 }
661
662 const char *pushremote_for_branch(struct branch *branch, int *explicit)
663 {
664 if (branch && branch->pushremote_name) {
665 if (explicit)
666 *explicit = 1;
667 return branch->pushremote_name;
668 }
669 if (pushremote_name) {
670 if (explicit)
671 *explicit = 1;
672 return pushremote_name;
673 }
674 return remote_for_branch(branch, explicit);
675 }
676
677 static struct remote *remote_get_1(const char *name,
678 const char *(*get_default)(struct branch *, int *))
679 {
680 struct remote *ret;
681 int name_given = 0;
682
683 read_config();
684
685 if (name)
686 name_given = 1;
687 else
688 name = get_default(current_branch, &name_given);
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 return remote_get_1(name, remote_for_branch);
709 }
710
711 struct remote *pushremote_get(const char *name)
712 {
713 return remote_get_1(name, pushremote_for_branch);
714 }
715
716 int remote_is_configured(const char *name)
717 {
718 struct remotes_hash_key lookup;
719 struct hashmap_entry lookup_entry;
720 read_config();
721
722 init_remotes_hash();
723 lookup.str = name;
724 lookup.len = strlen(name);
725 hashmap_entry_init(&lookup_entry, memhash(name, lookup.len));
726
727 return hashmap_get(&remotes_hash, &lookup_entry, &lookup) != NULL;
728 }
729
730 int for_each_remote(each_remote_fn fn, void *priv)
731 {
732 int i, result = 0;
733 read_config();
734 for (i = 0; i < remotes_nr && !result; i++) {
735 struct remote *r = remotes[i];
736 if (!r)
737 continue;
738 if (!r->fetch)
739 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
740 r->fetch_refspec);
741 if (!r->push)
742 r->push = parse_push_refspec(r->push_refspec_nr,
743 r->push_refspec);
744 result = fn(r, priv);
745 }
746 return result;
747 }
748
749 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
750 {
751 if (strcmp(ref1->name, ref2->name)) {
752 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
753 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
754 die(_("Cannot fetch both %s and %s to %s"),
755 ref1->name, ref2->name, ref2->peer_ref->name);
756 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
757 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
758 warning(_("%s usually tracks %s, not %s"),
759 ref2->peer_ref->name, ref2->name, ref1->name);
760 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
761 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
762 die(_("%s tracks both %s and %s"),
763 ref2->peer_ref->name, ref1->name, ref2->name);
764 } else {
765 /*
766 * This last possibility doesn't occur because
767 * FETCH_HEAD_IGNORE entries always appear at
768 * the end of the list.
769 */
770 die(_("Internal error"));
771 }
772 }
773 free(ref2->peer_ref);
774 free(ref2);
775 }
776
777 struct ref *ref_remove_duplicates(struct ref *ref_map)
778 {
779 struct string_list refs = STRING_LIST_INIT_NODUP;
780 struct ref *retval = NULL;
781 struct ref **p = &retval;
782
783 while (ref_map) {
784 struct ref *ref = ref_map;
785
786 ref_map = ref_map->next;
787 ref->next = NULL;
788
789 if (!ref->peer_ref) {
790 *p = ref;
791 p = &ref->next;
792 } else {
793 struct string_list_item *item =
794 string_list_insert(&refs, ref->peer_ref->name);
795
796 if (item->util) {
797 /* Entry already existed */
798 handle_duplicate((struct ref *)item->util, ref);
799 } else {
800 *p = ref;
801 p = &ref->next;
802 item->util = ref;
803 }
804 }
805 }
806
807 string_list_clear(&refs, 0);
808 return retval;
809 }
810
811 int remote_has_url(struct remote *remote, const char *url)
812 {
813 int i;
814 for (i = 0; i < remote->url_nr; i++) {
815 if (!strcmp(remote->url[i], url))
816 return 1;
817 }
818 return 0;
819 }
820
821 static int match_name_with_pattern(const char *key, const char *name,
822 const char *value, char **result)
823 {
824 const char *kstar = strchr(key, '*');
825 size_t klen;
826 size_t ksuffixlen;
827 size_t namelen;
828 int ret;
829 if (!kstar)
830 die("Key '%s' of pattern had no '*'", key);
831 klen = kstar - key;
832 ksuffixlen = strlen(kstar + 1);
833 namelen = strlen(name);
834 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
835 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
836 if (ret && value) {
837 struct strbuf sb = STRBUF_INIT;
838 const char *vstar = strchr(value, '*');
839 if (!vstar)
840 die("Value '%s' of pattern has no '*'", value);
841 strbuf_add(&sb, value, vstar - value);
842 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
843 strbuf_addstr(&sb, vstar + 1);
844 *result = strbuf_detach(&sb, NULL);
845 }
846 return ret;
847 }
848
849 static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
850 {
851 int i;
852 int find_src = !query->src;
853
854 if (find_src && !query->dst)
855 error("query_refspecs_multiple: need either src or dst");
856
857 for (i = 0; i < ref_count; i++) {
858 struct refspec *refspec = &refs[i];
859 const char *key = find_src ? refspec->dst : refspec->src;
860 const char *value = find_src ? refspec->src : refspec->dst;
861 const char *needle = find_src ? query->dst : query->src;
862 char **result = find_src ? &query->src : &query->dst;
863
864 if (!refspec->dst)
865 continue;
866 if (refspec->pattern) {
867 if (match_name_with_pattern(key, needle, value, result))
868 string_list_append_nodup(results, *result);
869 } else if (!strcmp(needle, key)) {
870 string_list_append(results, value);
871 }
872 }
873 }
874
875 int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
876 {
877 int i;
878 int find_src = !query->src;
879 const char *needle = find_src ? query->dst : query->src;
880 char **result = find_src ? &query->src : &query->dst;
881
882 if (find_src && !query->dst)
883 return error("query_refspecs: need either src or dst");
884
885 for (i = 0; i < ref_count; i++) {
886 struct refspec *refspec = &refs[i];
887 const char *key = find_src ? refspec->dst : refspec->src;
888 const char *value = find_src ? refspec->src : refspec->dst;
889
890 if (!refspec->dst)
891 continue;
892 if (refspec->pattern) {
893 if (match_name_with_pattern(key, needle, value, result)) {
894 query->force = refspec->force;
895 return 0;
896 }
897 } else if (!strcmp(needle, key)) {
898 *result = xstrdup(value);
899 query->force = refspec->force;
900 return 0;
901 }
902 }
903 return -1;
904 }
905
906 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
907 const char *name)
908 {
909 struct refspec query;
910
911 memset(&query, 0, sizeof(struct refspec));
912 query.src = (char *)name;
913
914 if (query_refspecs(refspecs, nr_refspec, &query))
915 return NULL;
916
917 return query.dst;
918 }
919
920 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
921 {
922 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
923 }
924
925 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
926 const char *name)
927 {
928 size_t len = strlen(name);
929 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
930 memcpy(ref->name, prefix, prefixlen);
931 memcpy(ref->name + prefixlen, name, len);
932 return ref;
933 }
934
935 struct ref *alloc_ref(const char *name)
936 {
937 return alloc_ref_with_prefix("", 0, name);
938 }
939
940 struct ref *copy_ref(const struct ref *ref)
941 {
942 struct ref *cpy;
943 size_t len;
944 if (!ref)
945 return NULL;
946 len = strlen(ref->name);
947 cpy = xmalloc(sizeof(struct ref) + len + 1);
948 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
949 cpy->next = NULL;
950 cpy->symref = xstrdup_or_null(ref->symref);
951 cpy->remote_status = xstrdup_or_null(ref->remote_status);
952 cpy->peer_ref = copy_ref(ref->peer_ref);
953 return cpy;
954 }
955
956 struct ref *copy_ref_list(const struct ref *ref)
957 {
958 struct ref *ret = NULL;
959 struct ref **tail = &ret;
960 while (ref) {
961 *tail = copy_ref(ref);
962 ref = ref->next;
963 tail = &((*tail)->next);
964 }
965 return ret;
966 }
967
968 static void free_ref(struct ref *ref)
969 {
970 if (!ref)
971 return;
972 free_ref(ref->peer_ref);
973 free(ref->remote_status);
974 free(ref->symref);
975 free(ref);
976 }
977
978 void free_refs(struct ref *ref)
979 {
980 struct ref *next;
981 while (ref) {
982 next = ref->next;
983 free_ref(ref);
984 ref = next;
985 }
986 }
987
988 int ref_compare_name(const void *va, const void *vb)
989 {
990 const struct ref *a = va, *b = vb;
991 return strcmp(a->name, b->name);
992 }
993
994 static void *ref_list_get_next(const void *a)
995 {
996 return ((const struct ref *)a)->next;
997 }
998
999 static void ref_list_set_next(void *a, void *next)
1000 {
1001 ((struct ref *)a)->next = next;
1002 }
1003
1004 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
1005 {
1006 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
1007 }
1008
1009 int count_refspec_match(const char *pattern,
1010 struct ref *refs,
1011 struct ref **matched_ref)
1012 {
1013 int patlen = strlen(pattern);
1014 struct ref *matched_weak = NULL;
1015 struct ref *matched = NULL;
1016 int weak_match = 0;
1017 int match = 0;
1018
1019 for (weak_match = match = 0; refs; refs = refs->next) {
1020 char *name = refs->name;
1021 int namelen = strlen(name);
1022
1023 if (!refname_match(pattern, name))
1024 continue;
1025
1026 /* A match is "weak" if it is with refs outside
1027 * heads or tags, and did not specify the pattern
1028 * in full (e.g. "refs/remotes/origin/master") or at
1029 * least from the toplevel (e.g. "remotes/origin/master");
1030 * otherwise "git push $URL master" would result in
1031 * ambiguity between remotes/origin/master and heads/master
1032 * at the remote site.
1033 */
1034 if (namelen != patlen &&
1035 patlen != namelen - 5 &&
1036 !starts_with(name, "refs/heads/") &&
1037 !starts_with(name, "refs/tags/")) {
1038 /* We want to catch the case where only weak
1039 * matches are found and there are multiple
1040 * matches, and where more than one strong
1041 * matches are found, as ambiguous. One
1042 * strong match with zero or more weak matches
1043 * are acceptable as a unique match.
1044 */
1045 matched_weak = refs;
1046 weak_match++;
1047 }
1048 else {
1049 matched = refs;
1050 match++;
1051 }
1052 }
1053 if (!matched) {
1054 if (matched_ref)
1055 *matched_ref = matched_weak;
1056 return weak_match;
1057 }
1058 else {
1059 if (matched_ref)
1060 *matched_ref = matched;
1061 return match;
1062 }
1063 }
1064
1065 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1066 {
1067 **tail = ref;
1068 while (ref->next)
1069 ref = ref->next;
1070 *tail = &ref->next;
1071 }
1072
1073 static struct ref *alloc_delete_ref(void)
1074 {
1075 struct ref *ref = alloc_ref("(delete)");
1076 hashclr(ref->new_sha1);
1077 return ref;
1078 }
1079
1080 static int try_explicit_object_name(const char *name,
1081 struct ref **match)
1082 {
1083 unsigned char sha1[20];
1084
1085 if (!*name) {
1086 if (match)
1087 *match = alloc_delete_ref();
1088 return 0;
1089 }
1090
1091 if (get_sha1(name, sha1))
1092 return -1;
1093
1094 if (match) {
1095 *match = alloc_ref(name);
1096 hashcpy((*match)->new_sha1, sha1);
1097 }
1098 return 0;
1099 }
1100
1101 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1102 {
1103 struct ref *ret = alloc_ref(name);
1104 tail_link_ref(ret, tail);
1105 return ret;
1106 }
1107
1108 static char *guess_ref(const char *name, struct ref *peer)
1109 {
1110 struct strbuf buf = STRBUF_INIT;
1111 unsigned char sha1[20];
1112
1113 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1114 sha1, NULL);
1115 if (!r)
1116 return NULL;
1117
1118 if (starts_with(r, "refs/heads/"))
1119 strbuf_addstr(&buf, "refs/heads/");
1120 else if (starts_with(r, "refs/tags/"))
1121 strbuf_addstr(&buf, "refs/tags/");
1122 else
1123 return NULL;
1124
1125 strbuf_addstr(&buf, name);
1126 return strbuf_detach(&buf, NULL);
1127 }
1128
1129 static int match_explicit_lhs(struct ref *src,
1130 struct refspec *rs,
1131 struct ref **match,
1132 int *allocated_match)
1133 {
1134 switch (count_refspec_match(rs->src, src, match)) {
1135 case 1:
1136 if (allocated_match)
1137 *allocated_match = 0;
1138 return 0;
1139 case 0:
1140 /* The source could be in the get_sha1() format
1141 * not a reference name. :refs/other is a
1142 * way to delete 'other' ref at the remote end.
1143 */
1144 if (try_explicit_object_name(rs->src, match) < 0)
1145 return error("src refspec %s does not match any.", rs->src);
1146 if (allocated_match)
1147 *allocated_match = 1;
1148 return 0;
1149 default:
1150 return error("src refspec %s matches more than one.", rs->src);
1151 }
1152 }
1153
1154 static int match_explicit(struct ref *src, struct ref *dst,
1155 struct ref ***dst_tail,
1156 struct refspec *rs)
1157 {
1158 struct ref *matched_src, *matched_dst;
1159 int allocated_src;
1160
1161 const char *dst_value = rs->dst;
1162 char *dst_guess;
1163
1164 if (rs->pattern || rs->matching)
1165 return 0;
1166
1167 matched_src = matched_dst = NULL;
1168 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1169 return -1;
1170
1171 if (!dst_value) {
1172 unsigned char sha1[20];
1173 int flag;
1174
1175 dst_value = resolve_ref_unsafe(matched_src->name,
1176 RESOLVE_REF_READING,
1177 sha1, &flag);
1178 if (!dst_value ||
1179 ((flag & REF_ISSYMREF) &&
1180 !starts_with(dst_value, "refs/heads/")))
1181 die("%s cannot be resolved to branch.",
1182 matched_src->name);
1183 }
1184
1185 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1186 case 1:
1187 break;
1188 case 0:
1189 if (starts_with(dst_value, "refs/"))
1190 matched_dst = make_linked_ref(dst_value, dst_tail);
1191 else if (is_null_sha1(matched_src->new_sha1))
1192 error("unable to delete '%s': remote ref does not exist",
1193 dst_value);
1194 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1195 matched_dst = make_linked_ref(dst_guess, dst_tail);
1196 else
1197 error("unable to push to unqualified destination: %s\n"
1198 "The destination refspec neither matches an "
1199 "existing ref on the remote nor\n"
1200 "begins with refs/, and we are unable to "
1201 "guess a prefix based on the source ref.",
1202 dst_value);
1203 break;
1204 default:
1205 matched_dst = NULL;
1206 error("dst refspec %s matches more than one.",
1207 dst_value);
1208 break;
1209 }
1210 if (!matched_dst)
1211 return -1;
1212 if (matched_dst->peer_ref)
1213 return error("dst ref %s receives from more than one src.",
1214 matched_dst->name);
1215 else {
1216 matched_dst->peer_ref = allocated_src ?
1217 matched_src :
1218 copy_ref(matched_src);
1219 matched_dst->force = rs->force;
1220 }
1221 return 0;
1222 }
1223
1224 static int match_explicit_refs(struct ref *src, struct ref *dst,
1225 struct ref ***dst_tail, struct refspec *rs,
1226 int rs_nr)
1227 {
1228 int i, errs;
1229 for (i = errs = 0; i < rs_nr; i++)
1230 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1231 return errs;
1232 }
1233
1234 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1235 int send_mirror, int direction, const struct refspec **ret_pat)
1236 {
1237 const struct refspec *pat;
1238 char *name;
1239 int i;
1240 int matching_refs = -1;
1241 for (i = 0; i < rs_nr; i++) {
1242 if (rs[i].matching &&
1243 (matching_refs == -1 || rs[i].force)) {
1244 matching_refs = i;
1245 continue;
1246 }
1247
1248 if (rs[i].pattern) {
1249 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1250 int match;
1251 if (direction == FROM_SRC)
1252 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1253 else
1254 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1255 if (match) {
1256 matching_refs = i;
1257 break;
1258 }
1259 }
1260 }
1261 if (matching_refs == -1)
1262 return NULL;
1263
1264 pat = rs + matching_refs;
1265 if (pat->matching) {
1266 /*
1267 * "matching refs"; traditionally we pushed everything
1268 * including refs outside refs/heads/ hierarchy, but
1269 * that does not make much sense these days.
1270 */
1271 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1272 return NULL;
1273 name = xstrdup(ref->name);
1274 }
1275 if (ret_pat)
1276 *ret_pat = pat;
1277 return name;
1278 }
1279
1280 static struct ref **tail_ref(struct ref **head)
1281 {
1282 struct ref **tail = head;
1283 while (*tail)
1284 tail = &((*tail)->next);
1285 return tail;
1286 }
1287
1288 struct tips {
1289 struct commit **tip;
1290 int nr, alloc;
1291 };
1292
1293 static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1294 {
1295 struct commit *commit;
1296
1297 if (is_null_sha1(sha1))
1298 return;
1299 commit = lookup_commit_reference_gently(sha1, 1);
1300 if (!commit || (commit->object.flags & TMP_MARK))
1301 return;
1302 commit->object.flags |= TMP_MARK;
1303 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1304 tips->tip[tips->nr++] = commit;
1305 }
1306
1307 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1308 {
1309 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1310 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1311 struct string_list_item *item;
1312 struct ref *ref;
1313 struct tips sent_tips;
1314
1315 /*
1316 * Collect everything we know they would have at the end of
1317 * this push, and collect all tags they have.
1318 */
1319 memset(&sent_tips, 0, sizeof(sent_tips));
1320 for (ref = *dst; ref; ref = ref->next) {
1321 if (ref->peer_ref &&
1322 !is_null_sha1(ref->peer_ref->new_sha1))
1323 add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1324 else
1325 add_to_tips(&sent_tips, ref->old_sha1);
1326 if (starts_with(ref->name, "refs/tags/"))
1327 string_list_append(&dst_tag, ref->name);
1328 }
1329 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1330
1331 string_list_sort(&dst_tag);
1332
1333 /* Collect tags they do not have. */
1334 for (ref = src; ref; ref = ref->next) {
1335 if (!starts_with(ref->name, "refs/tags/"))
1336 continue; /* not a tag */
1337 if (string_list_has_string(&dst_tag, ref->name))
1338 continue; /* they already have it */
1339 if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1340 continue; /* be conservative */
1341 item = string_list_append(&src_tag, ref->name);
1342 item->util = ref;
1343 }
1344 string_list_clear(&dst_tag, 0);
1345
1346 /*
1347 * At this point, src_tag lists tags that are missing from
1348 * dst, and sent_tips lists the tips we are pushing or those
1349 * that we know they already have. An element in the src_tag
1350 * that is an ancestor of any of the sent_tips needs to be
1351 * sent to the other side.
1352 */
1353 if (sent_tips.nr) {
1354 for_each_string_list_item(item, &src_tag) {
1355 struct ref *ref = item->util;
1356 struct ref *dst_ref;
1357 struct commit *commit;
1358
1359 if (is_null_sha1(ref->new_sha1))
1360 continue;
1361 commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1362 if (!commit)
1363 /* not pushing a commit, which is not an error */
1364 continue;
1365
1366 /*
1367 * Is this tag, which they do not have, reachable from
1368 * any of the commits we are sending?
1369 */
1370 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1371 continue;
1372
1373 /* Add it in */
1374 dst_ref = make_linked_ref(ref->name, dst_tail);
1375 hashcpy(dst_ref->new_sha1, ref->new_sha1);
1376 dst_ref->peer_ref = copy_ref(ref);
1377 }
1378 }
1379 string_list_clear(&src_tag, 0);
1380 free(sent_tips.tip);
1381 }
1382
1383 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1384 {
1385 for ( ; list; list = list->next)
1386 if (!strcmp(list->name, name))
1387 return (struct ref *)list;
1388 return NULL;
1389 }
1390
1391 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1392 {
1393 for ( ; ref; ref = ref->next)
1394 string_list_append_nodup(ref_index, ref->name)->util = ref;
1395
1396 string_list_sort(ref_index);
1397 }
1398
1399 /*
1400 * Given only the set of local refs, sanity-check the set of push
1401 * refspecs. We can't catch all errors that match_push_refs would,
1402 * but we can catch some errors early before even talking to the
1403 * remote side.
1404 */
1405 int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1406 {
1407 struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1408 int ret = 0;
1409 int i;
1410
1411 for (i = 0; i < nr_refspec; i++) {
1412 struct refspec *rs = refspec + i;
1413
1414 if (rs->pattern || rs->matching)
1415 continue;
1416
1417 ret |= match_explicit_lhs(src, rs, NULL, NULL);
1418 }
1419
1420 free_refspec(nr_refspec, refspec);
1421 return ret;
1422 }
1423
1424 /*
1425 * Given the set of refs the local repository has, the set of refs the
1426 * remote repository has, and the refspec used for push, determine
1427 * what remote refs we will update and with what value by setting
1428 * peer_ref (which object is being pushed) and force (if the push is
1429 * forced) in elements of "dst". The function may add new elements to
1430 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1431 */
1432 int match_push_refs(struct ref *src, struct ref **dst,
1433 int nr_refspec, const char **refspec, int flags)
1434 {
1435 struct refspec *rs;
1436 int send_all = flags & MATCH_REFS_ALL;
1437 int send_mirror = flags & MATCH_REFS_MIRROR;
1438 int send_prune = flags & MATCH_REFS_PRUNE;
1439 int errs;
1440 static const char *default_refspec[] = { ":", NULL };
1441 struct ref *ref, **dst_tail = tail_ref(dst);
1442 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1443
1444 if (!nr_refspec) {
1445 nr_refspec = 1;
1446 refspec = default_refspec;
1447 }
1448 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1449 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1450
1451 /* pick the remainder */
1452 for (ref = src; ref; ref = ref->next) {
1453 struct string_list_item *dst_item;
1454 struct ref *dst_peer;
1455 const struct refspec *pat = NULL;
1456 char *dst_name;
1457
1458 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1459 if (!dst_name)
1460 continue;
1461
1462 if (!dst_ref_index.nr)
1463 prepare_ref_index(&dst_ref_index, *dst);
1464
1465 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1466 dst_peer = dst_item ? dst_item->util : NULL;
1467 if (dst_peer) {
1468 if (dst_peer->peer_ref)
1469 /* We're already sending something to this ref. */
1470 goto free_name;
1471 } else {
1472 if (pat->matching && !(send_all || send_mirror))
1473 /*
1474 * Remote doesn't have it, and we have no
1475 * explicit pattern, and we don't have
1476 * --all or --mirror.
1477 */
1478 goto free_name;
1479
1480 /* Create a new one and link it */
1481 dst_peer = make_linked_ref(dst_name, &dst_tail);
1482 hashcpy(dst_peer->new_sha1, ref->new_sha1);
1483 string_list_insert(&dst_ref_index,
1484 dst_peer->name)->util = dst_peer;
1485 }
1486 dst_peer->peer_ref = copy_ref(ref);
1487 dst_peer->force = pat->force;
1488 free_name:
1489 free(dst_name);
1490 }
1491
1492 string_list_clear(&dst_ref_index, 0);
1493
1494 if (flags & MATCH_REFS_FOLLOW_TAGS)
1495 add_missing_tags(src, dst, &dst_tail);
1496
1497 if (send_prune) {
1498 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1499 /* check for missing refs on the remote */
1500 for (ref = *dst; ref; ref = ref->next) {
1501 char *src_name;
1502
1503 if (ref->peer_ref)
1504 /* We're already sending something to this ref. */
1505 continue;
1506
1507 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1508 if (src_name) {
1509 if (!src_ref_index.nr)
1510 prepare_ref_index(&src_ref_index, src);
1511 if (!string_list_has_string(&src_ref_index,
1512 src_name))
1513 ref->peer_ref = alloc_delete_ref();
1514 free(src_name);
1515 }
1516 }
1517 string_list_clear(&src_ref_index, 0);
1518 }
1519 if (errs)
1520 return -1;
1521 return 0;
1522 }
1523
1524 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1525 int force_update)
1526 {
1527 struct ref *ref;
1528
1529 for (ref = remote_refs; ref; ref = ref->next) {
1530 int force_ref_update = ref->force || force_update;
1531 int reject_reason = 0;
1532
1533 if (ref->peer_ref)
1534 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1535 else if (!send_mirror)
1536 continue;
1537
1538 ref->deletion = is_null_sha1(ref->new_sha1);
1539 if (!ref->deletion &&
1540 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1541 ref->status = REF_STATUS_UPTODATE;
1542 continue;
1543 }
1544
1545 /*
1546 * Bypass the usual "must fast-forward" check but
1547 * replace it with a weaker "the old value must be
1548 * this value we observed". If the remote ref has
1549 * moved and is now different from what we expect,
1550 * reject any push.
1551 *
1552 * It also is an error if the user told us to check
1553 * with the remote-tracking branch to find the value
1554 * to expect, but we did not have such a tracking
1555 * branch.
1556 */
1557 if (ref->expect_old_sha1) {
1558 if (ref->expect_old_no_trackback ||
1559 hashcmp(ref->old_sha1, ref->old_sha1_expect))
1560 reject_reason = REF_STATUS_REJECT_STALE;
1561 }
1562
1563 /*
1564 * The usual "must fast-forward" rules.
1565 *
1566 * Decide whether an individual refspec A:B can be
1567 * pushed. The push will succeed if any of the
1568 * following are true:
1569 *
1570 * (1) the remote reference B does not exist
1571 *
1572 * (2) the remote reference B is being removed (i.e.,
1573 * pushing :B where no source is specified)
1574 *
1575 * (3) the destination is not under refs/tags/, and
1576 * if the old and new value is a commit, the new
1577 * is a descendant of the old.
1578 *
1579 * (4) it is forced using the +A:B notation, or by
1580 * passing the --force argument
1581 */
1582
1583 else if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
1584 if (starts_with(ref->name, "refs/tags/"))
1585 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1586 else if (!has_sha1_file(ref->old_sha1))
1587 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1588 else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1589 !lookup_commit_reference_gently(ref->new_sha1, 1))
1590 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1591 else if (!ref_newer(ref->new_sha1, ref->old_sha1))
1592 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1593 }
1594
1595 /*
1596 * "--force" will defeat any rejection implemented
1597 * by the rules above.
1598 */
1599 if (!force_ref_update)
1600 ref->status = reject_reason;
1601 else if (reject_reason)
1602 ref->forced_update = 1;
1603 }
1604 }
1605
1606 static void set_merge(struct branch *ret)
1607 {
1608 struct remote *remote;
1609 char *ref;
1610 unsigned char sha1[20];
1611 int i;
1612
1613 if (!ret)
1614 return; /* no branch */
1615 if (ret->merge)
1616 return; /* already run */
1617 if (!ret->remote_name || !ret->merge_nr) {
1618 /*
1619 * no merge config; let's make sure we don't confuse callers
1620 * with a non-zero merge_nr but a NULL merge
1621 */
1622 ret->merge_nr = 0;
1623 return;
1624 }
1625
1626 remote = remote_get(ret->remote_name);
1627
1628 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1629 for (i = 0; i < ret->merge_nr; i++) {
1630 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1631 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1632 if (!remote_find_tracking(remote, ret->merge[i]) ||
1633 strcmp(ret->remote_name, "."))
1634 continue;
1635 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1636 sha1, &ref) == 1)
1637 ret->merge[i]->dst = ref;
1638 else
1639 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1640 }
1641 }
1642
1643 struct branch *branch_get(const char *name)
1644 {
1645 struct branch *ret;
1646
1647 read_config();
1648 if (!name || !*name || !strcmp(name, "HEAD"))
1649 ret = current_branch;
1650 else
1651 ret = make_branch(name, 0);
1652 set_merge(ret);
1653 return ret;
1654 }
1655
1656 int branch_has_merge_config(struct branch *branch)
1657 {
1658 return branch && !!branch->merge;
1659 }
1660
1661 int branch_merge_matches(struct branch *branch,
1662 int i,
1663 const char *refname)
1664 {
1665 if (!branch || i < 0 || i >= branch->merge_nr)
1666 return 0;
1667 return refname_match(branch->merge[i]->src, refname);
1668 }
1669
1670 __attribute((format (printf,2,3)))
1671 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1672 {
1673 if (err) {
1674 va_list ap;
1675 va_start(ap, fmt);
1676 strbuf_vaddf(err, fmt, ap);
1677 va_end(ap);
1678 }
1679 return NULL;
1680 }
1681
1682 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1683 {
1684 if (!branch)
1685 return error_buf(err, _("HEAD does not point to a branch"));
1686
1687 if (!branch->merge || !branch->merge[0]) {
1688 /*
1689 * no merge config; is it because the user didn't define any,
1690 * or because it is not a real branch, and get_branch
1691 * auto-vivified it?
1692 */
1693 if (!ref_exists(branch->refname))
1694 return error_buf(err, _("no such branch: '%s'"),
1695 branch->name);
1696 return error_buf(err,
1697 _("no upstream configured for branch '%s'"),
1698 branch->name);
1699 }
1700
1701 if (!branch->merge[0]->dst)
1702 return error_buf(err,
1703 _("upstream branch '%s' not stored as a remote-tracking branch"),
1704 branch->merge[0]->src);
1705
1706 return branch->merge[0]->dst;
1707 }
1708
1709 static const char *tracking_for_push_dest(struct remote *remote,
1710 const char *refname,
1711 struct strbuf *err)
1712 {
1713 char *ret;
1714
1715 ret = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
1716 if (!ret)
1717 return error_buf(err,
1718 _("push destination '%s' on remote '%s' has no local tracking branch"),
1719 refname, remote->name);
1720 return ret;
1721 }
1722
1723 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1724 {
1725 struct remote *remote;
1726
1727 if (!branch)
1728 return error_buf(err, _("HEAD does not point to a branch"));
1729
1730 remote = remote_get(pushremote_for_branch(branch, NULL));
1731 if (!remote)
1732 return error_buf(err,
1733 _("branch '%s' has no remote for pushing"),
1734 branch->name);
1735
1736 if (remote->push_refspec_nr) {
1737 char *dst;
1738 const char *ret;
1739
1740 dst = apply_refspecs(remote->push, remote->push_refspec_nr,
1741 branch->refname);
1742 if (!dst)
1743 return error_buf(err,
1744 _("push refspecs for '%s' do not include '%s'"),
1745 remote->name, branch->name);
1746
1747 ret = tracking_for_push_dest(remote, dst, err);
1748 free(dst);
1749 return ret;
1750 }
1751
1752 if (remote->mirror)
1753 return tracking_for_push_dest(remote, branch->refname, err);
1754
1755 switch (push_default) {
1756 case PUSH_DEFAULT_NOTHING:
1757 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1758
1759 case PUSH_DEFAULT_MATCHING:
1760 case PUSH_DEFAULT_CURRENT:
1761 return tracking_for_push_dest(remote, branch->refname, err);
1762
1763 case PUSH_DEFAULT_UPSTREAM:
1764 return branch_get_upstream(branch, err);
1765
1766 case PUSH_DEFAULT_UNSPECIFIED:
1767 case PUSH_DEFAULT_SIMPLE:
1768 {
1769 const char *up, *cur;
1770
1771 up = branch_get_upstream(branch, err);
1772 if (!up)
1773 return NULL;
1774 cur = tracking_for_push_dest(remote, branch->refname, err);
1775 if (!cur)
1776 return NULL;
1777 if (strcmp(cur, up))
1778 return error_buf(err,
1779 _("cannot resolve 'simple' push to a single destination"));
1780 return cur;
1781 }
1782 }
1783
1784 die("BUG: unhandled push situation");
1785 }
1786
1787 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1788 {
1789 if (!branch->push_tracking_ref)
1790 branch->push_tracking_ref = branch_get_push_1(branch, err);
1791 return branch->push_tracking_ref;
1792 }
1793
1794 static int ignore_symref_update(const char *refname)
1795 {
1796 unsigned char sha1[20];
1797 int flag;
1798
1799 if (!resolve_ref_unsafe(refname, 0, sha1, &flag))
1800 return 0; /* non-existing refs are OK */
1801 return (flag & REF_ISSYMREF);
1802 }
1803
1804 /*
1805 * Create and return a list of (struct ref) consisting of copies of
1806 * each remote_ref that matches refspec. refspec must be a pattern.
1807 * Fill in the copies' peer_ref to describe the local tracking refs to
1808 * which they map. Omit any references that would map to an existing
1809 * local symbolic ref.
1810 */
1811 static struct ref *get_expanded_map(const struct ref *remote_refs,
1812 const struct refspec *refspec)
1813 {
1814 const struct ref *ref;
1815 struct ref *ret = NULL;
1816 struct ref **tail = &ret;
1817
1818 for (ref = remote_refs; ref; ref = ref->next) {
1819 char *expn_name = NULL;
1820
1821 if (strchr(ref->name, '^'))
1822 continue; /* a dereference item */
1823 if (match_name_with_pattern(refspec->src, ref->name,
1824 refspec->dst, &expn_name) &&
1825 !ignore_symref_update(expn_name)) {
1826 struct ref *cpy = copy_ref(ref);
1827
1828 cpy->peer_ref = alloc_ref(expn_name);
1829 if (refspec->force)
1830 cpy->peer_ref->force = 1;
1831 *tail = cpy;
1832 tail = &cpy->next;
1833 }
1834 free(expn_name);
1835 }
1836
1837 return ret;
1838 }
1839
1840 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1841 {
1842 const struct ref *ref;
1843 for (ref = refs; ref; ref = ref->next) {
1844 if (refname_match(name, ref->name))
1845 return ref;
1846 }
1847 return NULL;
1848 }
1849
1850 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1851 {
1852 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1853
1854 if (!ref)
1855 return NULL;
1856
1857 return copy_ref(ref);
1858 }
1859
1860 static struct ref *get_local_ref(const char *name)
1861 {
1862 if (!name || name[0] == '\0')
1863 return NULL;
1864
1865 if (starts_with(name, "refs/"))
1866 return alloc_ref(name);
1867
1868 if (starts_with(name, "heads/") ||
1869 starts_with(name, "tags/") ||
1870 starts_with(name, "remotes/"))
1871 return alloc_ref_with_prefix("refs/", 5, name);
1872
1873 return alloc_ref_with_prefix("refs/heads/", 11, name);
1874 }
1875
1876 int get_fetch_map(const struct ref *remote_refs,
1877 const struct refspec *refspec,
1878 struct ref ***tail,
1879 int missing_ok)
1880 {
1881 struct ref *ref_map, **rmp;
1882
1883 if (refspec->pattern) {
1884 ref_map = get_expanded_map(remote_refs, refspec);
1885 } else {
1886 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1887
1888 if (refspec->exact_sha1) {
1889 ref_map = alloc_ref(name);
1890 get_sha1_hex(name, ref_map->old_sha1);
1891 } else {
1892 ref_map = get_remote_ref(remote_refs, name);
1893 }
1894 if (!missing_ok && !ref_map)
1895 die("Couldn't find remote ref %s", name);
1896 if (ref_map) {
1897 ref_map->peer_ref = get_local_ref(refspec->dst);
1898 if (ref_map->peer_ref && refspec->force)
1899 ref_map->peer_ref->force = 1;
1900 }
1901 }
1902
1903 for (rmp = &ref_map; *rmp; ) {
1904 if ((*rmp)->peer_ref) {
1905 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1906 check_refname_format((*rmp)->peer_ref->name, 0)) {
1907 struct ref *ignore = *rmp;
1908 error("* Ignoring funny ref '%s' locally",
1909 (*rmp)->peer_ref->name);
1910 *rmp = (*rmp)->next;
1911 free(ignore->peer_ref);
1912 free(ignore);
1913 continue;
1914 }
1915 }
1916 rmp = &((*rmp)->next);
1917 }
1918
1919 if (ref_map)
1920 tail_link_ref(ref_map, tail);
1921
1922 return 0;
1923 }
1924
1925 int resolve_remote_symref(struct ref *ref, struct ref *list)
1926 {
1927 if (!ref->symref)
1928 return 0;
1929 for (; list; list = list->next)
1930 if (!strcmp(ref->symref, list->name)) {
1931 hashcpy(ref->old_sha1, list->old_sha1);
1932 return 0;
1933 }
1934 return 1;
1935 }
1936
1937 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1938 {
1939 while (list) {
1940 struct commit_list *temp = list;
1941 temp->item->object.flags &= ~mark;
1942 list = temp->next;
1943 free(temp);
1944 }
1945 }
1946
1947 int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1948 {
1949 struct object *o;
1950 struct commit *old, *new;
1951 struct commit_list *list, *used;
1952 int found = 0;
1953
1954 /*
1955 * Both new and old must be commit-ish and new is descendant of
1956 * old. Otherwise we require --force.
1957 */
1958 o = deref_tag(parse_object(old_sha1), NULL, 0);
1959 if (!o || o->type != OBJ_COMMIT)
1960 return 0;
1961 old = (struct commit *) o;
1962
1963 o = deref_tag(parse_object(new_sha1), NULL, 0);
1964 if (!o || o->type != OBJ_COMMIT)
1965 return 0;
1966 new = (struct commit *) o;
1967
1968 if (parse_commit(new) < 0)
1969 return 0;
1970
1971 used = list = NULL;
1972 commit_list_insert(new, &list);
1973 while (list) {
1974 new = pop_most_recent_commit(&list, TMP_MARK);
1975 commit_list_insert(new, &used);
1976 if (new == old) {
1977 found = 1;
1978 break;
1979 }
1980 }
1981 unmark_and_free(list, TMP_MARK);
1982 unmark_and_free(used, TMP_MARK);
1983 return found;
1984 }
1985
1986 /*
1987 * Compare a branch with its upstream, and save their differences (number
1988 * of commits) in *num_ours and *num_theirs. The name of the upstream branch
1989 * (or NULL if no upstream is defined) is returned via *upstream_name, if it
1990 * is not itself NULL.
1991 *
1992 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1993 * upstream defined, or ref does not exist), 0 otherwise.
1994 */
1995 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1996 const char **upstream_name)
1997 {
1998 unsigned char sha1[20];
1999 struct commit *ours, *theirs;
2000 char symmetric[84];
2001 struct rev_info revs;
2002 const char *rev_argv[10], *base;
2003 int rev_argc;
2004
2005 /* Cannot stat unless we are marked to build on top of somebody else. */
2006 base = branch_get_upstream(branch, NULL);
2007 if (upstream_name)
2008 *upstream_name = base;
2009 if (!base)
2010 return -1;
2011
2012 /* Cannot stat if what we used to build on no longer exists */
2013 if (read_ref(base, sha1))
2014 return -1;
2015 theirs = lookup_commit_reference(sha1);
2016 if (!theirs)
2017 return -1;
2018
2019 if (read_ref(branch->refname, sha1))
2020 return -1;
2021 ours = lookup_commit_reference(sha1);
2022 if (!ours)
2023 return -1;
2024
2025 /* are we the same? */
2026 if (theirs == ours) {
2027 *num_theirs = *num_ours = 0;
2028 return 0;
2029 }
2030
2031 /* Run "rev-list --left-right ours...theirs" internally... */
2032 rev_argc = 0;
2033 rev_argv[rev_argc++] = NULL;
2034 rev_argv[rev_argc++] = "--left-right";
2035 rev_argv[rev_argc++] = symmetric;
2036 rev_argv[rev_argc++] = "--";
2037 rev_argv[rev_argc] = NULL;
2038
2039 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
2040 strcpy(symmetric + 40, "...");
2041 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
2042
2043 init_revisions(&revs, NULL);
2044 setup_revisions(rev_argc, rev_argv, &revs, NULL);
2045 if (prepare_revision_walk(&revs))
2046 die("revision walk setup failed");
2047
2048 /* ... and count the commits on each side. */
2049 *num_ours = 0;
2050 *num_theirs = 0;
2051 while (1) {
2052 struct commit *c = get_revision(&revs);
2053 if (!c)
2054 break;
2055 if (c->object.flags & SYMMETRIC_LEFT)
2056 (*num_ours)++;
2057 else
2058 (*num_theirs)++;
2059 }
2060
2061 /* clear object flags smudged by the above traversal */
2062 clear_commit_marks(ours, ALL_REV_FLAGS);
2063 clear_commit_marks(theirs, ALL_REV_FLAGS);
2064 return 0;
2065 }
2066
2067 /*
2068 * Return true when there is anything to report, otherwise false.
2069 */
2070 int format_tracking_info(struct branch *branch, struct strbuf *sb)
2071 {
2072 int ours, theirs;
2073 const char *full_base;
2074 char *base;
2075 int upstream_is_gone = 0;
2076
2077 if (stat_tracking_info(branch, &ours, &theirs, &full_base) < 0) {
2078 if (!full_base)
2079 return 0;
2080 upstream_is_gone = 1;
2081 }
2082
2083 base = shorten_unambiguous_ref(full_base, 0);
2084 if (upstream_is_gone) {
2085 strbuf_addf(sb,
2086 _("Your branch is based on '%s', but the upstream is gone.\n"),
2087 base);
2088 if (advice_status_hints)
2089 strbuf_addf(sb,
2090 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
2091 } else if (!ours && !theirs) {
2092 strbuf_addf(sb,
2093 _("Your branch is up-to-date with '%s'.\n"),
2094 base);
2095 } else if (!theirs) {
2096 strbuf_addf(sb,
2097 Q_("Your branch is ahead of '%s' by %d commit.\n",
2098 "Your branch is ahead of '%s' by %d commits.\n",
2099 ours),
2100 base, ours);
2101 if (advice_status_hints)
2102 strbuf_addf(sb,
2103 _(" (use \"git push\" to publish your local commits)\n"));
2104 } else if (!ours) {
2105 strbuf_addf(sb,
2106 Q_("Your branch is behind '%s' by %d commit, "
2107 "and can be fast-forwarded.\n",
2108 "Your branch is behind '%s' by %d commits, "
2109 "and can be fast-forwarded.\n",
2110 theirs),
2111 base, theirs);
2112 if (advice_status_hints)
2113 strbuf_addf(sb,
2114 _(" (use \"git pull\" to update your local branch)\n"));
2115 } else {
2116 strbuf_addf(sb,
2117 Q_("Your branch and '%s' have diverged,\n"
2118 "and have %d and %d different commit each, "
2119 "respectively.\n",
2120 "Your branch and '%s' have diverged,\n"
2121 "and have %d and %d different commits each, "
2122 "respectively.\n",
2123 theirs),
2124 base, ours, theirs);
2125 if (advice_status_hints)
2126 strbuf_addf(sb,
2127 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2128 }
2129 free(base);
2130 return 1;
2131 }
2132
2133 static int one_local_ref(const char *refname, const struct object_id *oid,
2134 int flag, void *cb_data)
2135 {
2136 struct ref ***local_tail = cb_data;
2137 struct ref *ref;
2138 int len;
2139
2140 /* we already know it starts with refs/ to get here */
2141 if (check_refname_format(refname + 5, 0))
2142 return 0;
2143
2144 len = strlen(refname) + 1;
2145 ref = xcalloc(1, sizeof(*ref) + len);
2146 hashcpy(ref->new_sha1, oid->hash);
2147 memcpy(ref->name, refname, len);
2148 **local_tail = ref;
2149 *local_tail = &ref->next;
2150 return 0;
2151 }
2152
2153 struct ref *get_local_heads(void)
2154 {
2155 struct ref *local_refs = NULL, **local_tail = &local_refs;
2156
2157 for_each_ref(one_local_ref, &local_tail);
2158 return local_refs;
2159 }
2160
2161 struct ref *guess_remote_head(const struct ref *head,
2162 const struct ref *refs,
2163 int all)
2164 {
2165 const struct ref *r;
2166 struct ref *list = NULL;
2167 struct ref **tail = &list;
2168
2169 if (!head)
2170 return NULL;
2171
2172 /*
2173 * Some transports support directly peeking at
2174 * where HEAD points; if that is the case, then
2175 * we don't have to guess.
2176 */
2177 if (head->symref)
2178 return copy_ref(find_ref_by_name(refs, head->symref));
2179
2180 /* If refs/heads/master could be right, it is. */
2181 if (!all) {
2182 r = find_ref_by_name(refs, "refs/heads/master");
2183 if (r && !hashcmp(r->old_sha1, head->old_sha1))
2184 return copy_ref(r);
2185 }
2186
2187 /* Look for another ref that points there */
2188 for (r = refs; r; r = r->next) {
2189 if (r != head &&
2190 starts_with(r->name, "refs/heads/") &&
2191 !hashcmp(r->old_sha1, head->old_sha1)) {
2192 *tail = copy_ref(r);
2193 tail = &((*tail)->next);
2194 if (!all)
2195 break;
2196 }
2197 }
2198
2199 return list;
2200 }
2201
2202 struct stale_heads_info {
2203 struct string_list *ref_names;
2204 struct ref **stale_refs_tail;
2205 struct refspec *refs;
2206 int ref_count;
2207 };
2208
2209 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2210 int flags, void *cb_data)
2211 {
2212 struct stale_heads_info *info = cb_data;
2213 struct string_list matches = STRING_LIST_INIT_DUP;
2214 struct refspec query;
2215 int i, stale = 1;
2216 memset(&query, 0, sizeof(struct refspec));
2217 query.dst = (char *)refname;
2218
2219 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2220 if (matches.nr == 0)
2221 goto clean_exit; /* No matches */
2222
2223 /*
2224 * If we did find a suitable refspec and it's not a symref and
2225 * it's not in the list of refs that currently exist in that
2226 * remote, we consider it to be stale. In order to deal with
2227 * overlapping refspecs, we need to go over all of the
2228 * matching refs.
2229 */
2230 if (flags & REF_ISSYMREF)
2231 goto clean_exit;
2232
2233 for (i = 0; stale && i < matches.nr; i++)
2234 if (string_list_has_string(info->ref_names, matches.items[i].string))
2235 stale = 0;
2236
2237 if (stale) {
2238 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2239 hashcpy(ref->new_sha1, oid->hash);
2240 }
2241
2242 clean_exit:
2243 string_list_clear(&matches, 0);
2244 return 0;
2245 }
2246
2247 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2248 {
2249 struct ref *ref, *stale_refs = NULL;
2250 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2251 struct stale_heads_info info;
2252
2253 info.ref_names = &ref_names;
2254 info.stale_refs_tail = &stale_refs;
2255 info.refs = refs;
2256 info.ref_count = ref_count;
2257 for (ref = fetch_map; ref; ref = ref->next)
2258 string_list_append(&ref_names, ref->name);
2259 string_list_sort(&ref_names);
2260 for_each_ref(get_stale_heads_cb, &info);
2261 string_list_clear(&ref_names, 0);
2262 return stale_refs;
2263 }
2264
2265 /*
2266 * Compare-and-swap
2267 */
2268 static void clear_cas_option(struct push_cas_option *cas)
2269 {
2270 int i;
2271
2272 for (i = 0; i < cas->nr; i++)
2273 free(cas->entry[i].refname);
2274 free(cas->entry);
2275 memset(cas, 0, sizeof(*cas));
2276 }
2277
2278 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2279 const char *refname,
2280 size_t refnamelen)
2281 {
2282 struct push_cas *entry;
2283 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2284 entry = &cas->entry[cas->nr++];
2285 memset(entry, 0, sizeof(*entry));
2286 entry->refname = xmemdupz(refname, refnamelen);
2287 return entry;
2288 }
2289
2290 int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2291 {
2292 const char *colon;
2293 struct push_cas *entry;
2294
2295 if (unset) {
2296 /* "--no-<option>" */
2297 clear_cas_option(cas);
2298 return 0;
2299 }
2300
2301 if (!arg) {
2302 /* just "--<option>" */
2303 cas->use_tracking_for_rest = 1;
2304 return 0;
2305 }
2306
2307 /* "--<option>=refname" or "--<option>=refname:value" */
2308 colon = strchrnul(arg, ':');
2309 entry = add_cas_entry(cas, arg, colon - arg);
2310 if (!*colon)
2311 entry->use_tracking = 1;
2312 else if (get_sha1(colon + 1, entry->expect))
2313 return error("cannot parse expected object name '%s'", colon + 1);
2314 return 0;
2315 }
2316
2317 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2318 {
2319 return parse_push_cas_option(opt->value, arg, unset);
2320 }
2321
2322 int is_empty_cas(const struct push_cas_option *cas)
2323 {
2324 return !cas->use_tracking_for_rest && !cas->nr;
2325 }
2326
2327 /*
2328 * Look at remote.fetch refspec and see if we have a remote
2329 * tracking branch for the refname there. Fill its current
2330 * value in sha1[].
2331 * If we cannot do so, return negative to signal an error.
2332 */
2333 static int remote_tracking(struct remote *remote, const char *refname,
2334 unsigned char sha1[20])
2335 {
2336 char *dst;
2337
2338 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2339 if (!dst)
2340 return -1; /* no tracking ref for refname at remote */
2341 if (read_ref(dst, sha1))
2342 return -1; /* we know what the tracking ref is but we cannot read it */
2343 return 0;
2344 }
2345
2346 static void apply_cas(struct push_cas_option *cas,
2347 struct remote *remote,
2348 struct ref *ref)
2349 {
2350 int i;
2351
2352 /* Find an explicit --<option>=<name>[:<value>] entry */
2353 for (i = 0; i < cas->nr; i++) {
2354 struct push_cas *entry = &cas->entry[i];
2355 if (!refname_match(entry->refname, ref->name))
2356 continue;
2357 ref->expect_old_sha1 = 1;
2358 if (!entry->use_tracking)
2359 hashcpy(ref->old_sha1_expect, cas->entry[i].expect);
2360 else if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2361 ref->expect_old_no_trackback = 1;
2362 return;
2363 }
2364
2365 /* Are we using "--<option>" to cover all? */
2366 if (!cas->use_tracking_for_rest)
2367 return;
2368
2369 ref->expect_old_sha1 = 1;
2370 if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2371 ref->expect_old_no_trackback = 1;
2372 }
2373
2374 void apply_push_cas(struct push_cas_option *cas,
2375 struct remote *remote,
2376 struct ref *remote_refs)
2377 {
2378 struct ref *ref;
2379 for (ref = remote_refs; ref; ref = ref->next)
2380 apply_cas(cas, remote, ref);
2381 }
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