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check_stream_sha1(): handle input underflow
[git.git] / remote.c
blob9f83fe2c4cbd477e47fc6c81eab324be7aa088c6
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 #include "argv-array.h"
12
13 enum map_direction { FROM_SRC, FROM_DST };
14
15 static struct refspec s_tag_refspec = {
16 0,
17 1,
18 0,
19 0,
20 "refs/tags/*",
21 "refs/tags/*"
22 };
23
24 const struct refspec *tag_refspec = &s_tag_refspec;
25
26 struct counted_string {
27 size_t len;
28 const char *s;
29 };
30 struct rewrite {
31 const char *base;
32 size_t baselen;
33 struct counted_string *instead_of;
34 int instead_of_nr;
35 int instead_of_alloc;
36 };
37 struct rewrites {
38 struct rewrite **rewrite;
39 int rewrite_alloc;
40 int rewrite_nr;
41 };
42
43 static struct remote **remotes;
44 static int remotes_alloc;
45 static int remotes_nr;
46 static struct hashmap remotes_hash;
47
48 static struct branch **branches;
49 static int branches_alloc;
50 static int branches_nr;
51
52 static struct branch *current_branch;
53 static const char *pushremote_name;
54
55 static struct rewrites rewrites;
56 static struct rewrites rewrites_push;
57
58 static int valid_remote(const struct remote *remote)
59 {
60 return (!!remote->url) || (!!remote->foreign_vcs);
61 }
62
63 static const char *alias_url(const char *url, struct rewrites *r)
64 {
65 int i, j;
66 struct counted_string *longest;
67 int longest_i;
68
69 longest = NULL;
70 longest_i = -1;
71 for (i = 0; i < r->rewrite_nr; i++) {
72 if (!r->rewrite[i])
73 continue;
74 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
75 if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
76 (!longest ||
77 longest->len < r->rewrite[i]->instead_of[j].len)) {
78 longest = &(r->rewrite[i]->instead_of[j]);
79 longest_i = i;
80 }
81 }
82 }
83 if (!longest)
84 return url;
85
86 return xstrfmt("%s%s", r->rewrite[longest_i]->base, url + longest->len);
87 }
88
89 static void add_push_refspec(struct remote *remote, const char *ref)
90 {
91 ALLOC_GROW(remote->push_refspec,
92 remote->push_refspec_nr + 1,
93 remote->push_refspec_alloc);
94 remote->push_refspec[remote->push_refspec_nr++] = ref;
95 }
96
97 static void add_fetch_refspec(struct remote *remote, const char *ref)
98 {
99 ALLOC_GROW(remote->fetch_refspec,
100 remote->fetch_refspec_nr + 1,
101 remote->fetch_refspec_alloc);
102 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
103 }
104
105 static void add_url(struct remote *remote, const char *url)
106 {
107 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
108 remote->url[remote->url_nr++] = url;
109 }
110
111 static void add_pushurl(struct remote *remote, const char *pushurl)
112 {
113 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
114 remote->pushurl[remote->pushurl_nr++] = pushurl;
115 }
116
117 static void add_pushurl_alias(struct remote *remote, const char *url)
118 {
119 const char *pushurl = alias_url(url, &rewrites_push);
120 if (pushurl != url)
121 add_pushurl(remote, pushurl);
122 }
123
124 static void add_url_alias(struct remote *remote, const char *url)
125 {
126 add_url(remote, alias_url(url, &rewrites));
127 add_pushurl_alias(remote, url);
128 }
129
130 struct remotes_hash_key {
131 const char *str;
132 int len;
133 };
134
135 static int remotes_hash_cmp(const struct remote *a, const struct remote *b, const struct remotes_hash_key *key)
136 {
137 if (key)
138 return strncmp(a->name, key->str, key->len) || a->name[key->len];
139 else
140 return strcmp(a->name, b->name);
141 }
142
143 static inline void init_remotes_hash(void)
144 {
145 if (!remotes_hash.cmpfn)
146 hashmap_init(&remotes_hash, (hashmap_cmp_fn)remotes_hash_cmp, 0);
147 }
148
149 static struct remote *make_remote(const char *name, int len)
150 {
151 struct remote *ret, *replaced;
152 struct remotes_hash_key lookup;
153 struct hashmap_entry lookup_entry;
154
155 if (!len)
156 len = strlen(name);
157
158 init_remotes_hash();
159 lookup.str = name;
160 lookup.len = len;
161 hashmap_entry_init(&lookup_entry, memhash(name, len));
162
163 if ((ret = hashmap_get(&remotes_hash, &lookup_entry, &lookup)) != NULL)
164 return ret;
165
166 ret = xcalloc(1, sizeof(struct remote));
167 ret->prune = -1; /* unspecified */
168 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
169 remotes[remotes_nr++] = ret;
170 ret->name = xstrndup(name, len);
171
172 hashmap_entry_init(ret, lookup_entry.hash);
173 replaced = hashmap_put(&remotes_hash, ret);
174 assert(replaced == NULL); /* no previous entry overwritten */
175 return ret;
176 }
177
178 static void add_merge(struct branch *branch, const char *name)
179 {
180 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
181 branch->merge_alloc);
182 branch->merge_name[branch->merge_nr++] = name;
183 }
184
185 static struct branch *make_branch(const char *name, int len)
186 {
187 struct branch *ret;
188 int i;
189
190 for (i = 0; i < branches_nr; i++) {
191 if (len ? (!strncmp(name, branches[i]->name, len) &&
192 !branches[i]->name[len]) :
193 !strcmp(name, branches[i]->name))
194 return branches[i];
195 }
196
197 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
198 ret = xcalloc(1, sizeof(struct branch));
199 branches[branches_nr++] = ret;
200 if (len)
201 ret->name = xstrndup(name, len);
202 else
203 ret->name = xstrdup(name);
204 ret->refname = xstrfmt("refs/heads/%s", ret->name);
205
206 return ret;
207 }
208
209 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
210 {
211 struct rewrite *ret;
212 int i;
213
214 for (i = 0; i < r->rewrite_nr; i++) {
215 if (len
216 ? (len == r->rewrite[i]->baselen &&
217 !strncmp(base, r->rewrite[i]->base, len))
218 : !strcmp(base, r->rewrite[i]->base))
219 return r->rewrite[i];
220 }
221
222 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
223 ret = xcalloc(1, sizeof(struct rewrite));
224 r->rewrite[r->rewrite_nr++] = ret;
225 if (len) {
226 ret->base = xstrndup(base, len);
227 ret->baselen = len;
228 }
229 else {
230 ret->base = xstrdup(base);
231 ret->baselen = strlen(base);
232 }
233 return ret;
234 }
235
236 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
237 {
238 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
239 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
240 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
241 rewrite->instead_of_nr++;
242 }
243
244 static const char *skip_spaces(const char *s)
245 {
246 while (isspace(*s))
247 s++;
248 return s;
249 }
250
251 static void read_remotes_file(struct remote *remote)
252 {
253 struct strbuf buf = STRBUF_INIT;
254 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
255
256 if (!f)
257 return;
258 remote->configured_in_repo = 1;
259 remote->origin = REMOTE_REMOTES;
260 while (strbuf_getline(&buf, f) != EOF) {
261 const char *v;
262
263 strbuf_rtrim(&buf);
264
265 if (skip_prefix(buf.buf, "URL:", &v))
266 add_url_alias(remote, xstrdup(skip_spaces(v)));
267 else if (skip_prefix(buf.buf, "Push:", &v))
268 add_push_refspec(remote, xstrdup(skip_spaces(v)));
269 else if (skip_prefix(buf.buf, "Pull:", &v))
270 add_fetch_refspec(remote, xstrdup(skip_spaces(v)));
271 }
272 strbuf_release(&buf);
273 fclose(f);
274 }
275
276 static void read_branches_file(struct remote *remote)
277 {
278 char *frag;
279 struct strbuf buf = STRBUF_INIT;
280 FILE *f = fopen(git_path("branches/%s", remote->name), "r");
281
282 if (!f)
283 return;
284
285 strbuf_getline_lf(&buf, f);
286 fclose(f);
287 strbuf_trim(&buf);
288 if (!buf.len) {
289 strbuf_release(&buf);
290 return;
291 }
292
293 remote->configured_in_repo = 1;
294 remote->origin = REMOTE_BRANCHES;
295
296 /*
297 * The branches file would have URL and optionally
298 * #branch specified. The "master" (or specified) branch is
299 * fetched and stored in the local branch matching the
300 * remote name.
301 */
302 frag = strchr(buf.buf, '#');
303 if (frag)
304 *(frag++) = '\0';
305 else
306 frag = "master";
307
308 add_url_alias(remote, strbuf_detach(&buf, NULL));
309 add_fetch_refspec(remote, xstrfmt("refs/heads/%s:refs/heads/%s",
310 frag, remote->name));
311
312 /*
313 * Cogito compatible push: push current HEAD to remote #branch
314 * (master if missing)
315 */
316 add_push_refspec(remote, xstrfmt("HEAD:refs/heads/%s", frag));
317 remote->fetch_tags = 1; /* always auto-follow */
318 }
319
320 static int handle_config(const char *key, const char *value, void *cb)
321 {
322 const char *name;
323 int namelen;
324 const char *subkey;
325 struct remote *remote;
326 struct branch *branch;
327 if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
328 if (!name)
329 return 0;
330 branch = make_branch(name, namelen);
331 if (!strcmp(subkey, "remote")) {
332 return git_config_string(&branch->remote_name, key, value);
333 } else if (!strcmp(subkey, "pushremote")) {
334 return git_config_string(&branch->pushremote_name, key, value);
335 } else if (!strcmp(subkey, "merge")) {
336 if (!value)
337 return config_error_nonbool(key);
338 add_merge(branch, xstrdup(value));
339 }
340 return 0;
341 }
342 if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
343 struct rewrite *rewrite;
344 if (!name)
345 return 0;
346 if (!strcmp(subkey, "insteadof")) {
347 rewrite = make_rewrite(&rewrites, name, namelen);
348 if (!value)
349 return config_error_nonbool(key);
350 add_instead_of(rewrite, xstrdup(value));
351 } else if (!strcmp(subkey, "pushinsteadof")) {
352 rewrite = make_rewrite(&rewrites_push, name, namelen);
353 if (!value)
354 return config_error_nonbool(key);
355 add_instead_of(rewrite, xstrdup(value));
356 }
357 }
358
359 if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
360 return 0;
361
362 /* Handle remote.* variables */
363 if (!name && !strcmp(subkey, "pushdefault"))
364 return git_config_string(&pushremote_name, key, value);
365
366 if (!name)
367 return 0;
368 /* Handle remote.<name>.* variables */
369 if (*name == '/') {
370 warning("Config remote shorthand cannot begin with '/': %s",
371 name);
372 return 0;
373 }
374 remote = make_remote(name, namelen);
375 remote->origin = REMOTE_CONFIG;
376 if (current_config_scope() == CONFIG_SCOPE_REPO)
377 remote->configured_in_repo = 1;
378 if (!strcmp(subkey, "mirror"))
379 remote->mirror = git_config_bool(key, value);
380 else if (!strcmp(subkey, "skipdefaultupdate"))
381 remote->skip_default_update = git_config_bool(key, value);
382 else if (!strcmp(subkey, "skipfetchall"))
383 remote->skip_default_update = git_config_bool(key, value);
384 else if (!strcmp(subkey, "prune"))
385 remote->prune = git_config_bool(key, value);
386 else if (!strcmp(subkey, "url")) {
387 const char *v;
388 if (git_config_string(&v, key, value))
389 return -1;
390 add_url(remote, v);
391 } else if (!strcmp(subkey, "pushurl")) {
392 const char *v;
393 if (git_config_string(&v, key, value))
394 return -1;
395 add_pushurl(remote, v);
396 } else if (!strcmp(subkey, "push")) {
397 const char *v;
398 if (git_config_string(&v, key, value))
399 return -1;
400 add_push_refspec(remote, v);
401 } else if (!strcmp(subkey, "fetch")) {
402 const char *v;
403 if (git_config_string(&v, key, value))
404 return -1;
405 add_fetch_refspec(remote, v);
406 } else if (!strcmp(subkey, "receivepack")) {
407 const char *v;
408 if (git_config_string(&v, key, value))
409 return -1;
410 if (!remote->receivepack)
411 remote->receivepack = v;
412 else
413 error("more than one receivepack given, using the first");
414 } else if (!strcmp(subkey, "uploadpack")) {
415 const char *v;
416 if (git_config_string(&v, key, value))
417 return -1;
418 if (!remote->uploadpack)
419 remote->uploadpack = v;
420 else
421 error("more than one uploadpack given, using the first");
422 } else if (!strcmp(subkey, "tagopt")) {
423 if (!strcmp(value, "--no-tags"))
424 remote->fetch_tags = -1;
425 else if (!strcmp(value, "--tags"))
426 remote->fetch_tags = 2;
427 } else if (!strcmp(subkey, "proxy")) {
428 return git_config_string((const char **)&remote->http_proxy,
429 key, value);
430 } else if (!strcmp(subkey, "proxyauthmethod")) {
431 return git_config_string((const char **)&remote->http_proxy_authmethod,
432 key, value);
433 } else if (!strcmp(subkey, "vcs")) {
434 return git_config_string(&remote->foreign_vcs, key, value);
435 }
436 return 0;
437 }
438
439 static void alias_all_urls(void)
440 {
441 int i, j;
442 for (i = 0; i < remotes_nr; i++) {
443 int add_pushurl_aliases;
444 if (!remotes[i])
445 continue;
446 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
447 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
448 }
449 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
450 for (j = 0; j < remotes[i]->url_nr; j++) {
451 if (add_pushurl_aliases)
452 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
453 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
454 }
455 }
456 }
457
458 static void read_config(void)
459 {
460 static int loaded;
461 struct object_id oid;
462 int flag;
463
464 if (loaded)
465 return;
466 loaded = 1;
467
468 current_branch = NULL;
469 if (startup_info->have_repository) {
470 const char *head_ref = resolve_ref_unsafe("HEAD", 0, oid.hash, &flag);
471 if (head_ref && (flag & REF_ISSYMREF) &&
472 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
473 current_branch = make_branch(head_ref, 0);
474 }
475 }
476 git_config(handle_config, NULL);
477 alias_all_urls();
478 }
479
480 /*
481 * This function frees a refspec array.
482 * Warning: code paths should be checked to ensure that the src
483 * and dst pointers are always freeable pointers as well
484 * as the refspec pointer itself.
485 */
486 static void free_refspecs(struct refspec *refspec, int nr_refspec)
487 {
488 int i;
489
490 if (!refspec)
491 return;
492
493 for (i = 0; i < nr_refspec; i++) {
494 free(refspec[i].src);
495 free(refspec[i].dst);
496 }
497 free(refspec);
498 }
499
500 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
501 {
502 int i;
503 struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
504
505 for (i = 0; i < nr_refspec; i++) {
506 size_t llen;
507 int is_glob;
508 const char *lhs, *rhs;
509 int flags;
510
511 is_glob = 0;
512
513 lhs = refspec[i];
514 if (*lhs == '+') {
515 rs[i].force = 1;
516 lhs++;
517 }
518
519 rhs = strrchr(lhs, ':');
520
521 /*
522 * Before going on, special case ":" (or "+:") as a refspec
523 * for pushing matching refs.
524 */
525 if (!fetch && rhs == lhs && rhs[1] == '\0') {
526 rs[i].matching = 1;
527 continue;
528 }
529
530 if (rhs) {
531 size_t rlen = strlen(++rhs);
532 is_glob = (1 <= rlen && strchr(rhs, '*'));
533 rs[i].dst = xstrndup(rhs, rlen);
534 }
535
536 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
537 if (1 <= llen && memchr(lhs, '*', llen)) {
538 if ((rhs && !is_glob) || (!rhs && fetch))
539 goto invalid;
540 is_glob = 1;
541 } else if (rhs && is_glob) {
542 goto invalid;
543 }
544
545 rs[i].pattern = is_glob;
546 rs[i].src = xstrndup(lhs, llen);
547 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
548
549 if (fetch) {
550 struct object_id unused;
551
552 /* LHS */
553 if (!*rs[i].src)
554 ; /* empty is ok; it means "HEAD" */
555 else if (llen == GIT_SHA1_HEXSZ && !get_oid_hex(rs[i].src, &unused))
556 rs[i].exact_sha1 = 1; /* ok */
557 else if (!check_refname_format(rs[i].src, flags))
558 ; /* valid looking ref is ok */
559 else
560 goto invalid;
561 /* RHS */
562 if (!rs[i].dst)
563 ; /* missing is ok; it is the same as empty */
564 else if (!*rs[i].dst)
565 ; /* empty is ok; it means "do not store" */
566 else if (!check_refname_format(rs[i].dst, flags))
567 ; /* valid looking ref is ok */
568 else
569 goto invalid;
570 } else {
571 /*
572 * LHS
573 * - empty is allowed; it means delete.
574 * - when wildcarded, it must be a valid looking ref.
575 * - otherwise, it must be an extended SHA-1, but
576 * there is no existing way to validate this.
577 */
578 if (!*rs[i].src)
579 ; /* empty is ok */
580 else if (is_glob) {
581 if (check_refname_format(rs[i].src, flags))
582 goto invalid;
583 }
584 else
585 ; /* anything goes, for now */
586 /*
587 * RHS
588 * - missing is allowed, but LHS then must be a
589 * valid looking ref.
590 * - empty is not allowed.
591 * - otherwise it must be a valid looking ref.
592 */
593 if (!rs[i].dst) {
594 if (check_refname_format(rs[i].src, flags))
595 goto invalid;
596 } else if (!*rs[i].dst) {
597 goto invalid;
598 } else {
599 if (check_refname_format(rs[i].dst, flags))
600 goto invalid;
601 }
602 }
603 }
604 return rs;
605
606 invalid:
607 if (verify) {
608 /*
609 * nr_refspec must be greater than zero and i must be valid
610 * since it is only possible to reach this point from within
611 * the for loop above.
612 */
613 free_refspecs(rs, i+1);
614 return NULL;
615 }
616 die("Invalid refspec '%s'", refspec[i]);
617 }
618
619 int valid_fetch_refspec(const char *fetch_refspec_str)
620 {
621 struct refspec *refspec;
622
623 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
624 free_refspecs(refspec, 1);
625 return !!refspec;
626 }
627
628 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
629 {
630 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
631 }
632
633 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
634 {
635 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
636 }
637
638 void free_refspec(int nr_refspec, struct refspec *refspec)
639 {
640 int i;
641 for (i = 0; i < nr_refspec; i++) {
642 free(refspec[i].src);
643 free(refspec[i].dst);
644 }
645 free(refspec);
646 }
647
648 static int valid_remote_nick(const char *name)
649 {
650 if (!name[0] || is_dot_or_dotdot(name))
651 return 0;
652 return !strchr(name, '/'); /* no slash */
653 }
654
655 const char *remote_for_branch(struct branch *branch, int *explicit)
656 {
657 if (branch && branch->remote_name) {
658 if (explicit)
659 *explicit = 1;
660 return branch->remote_name;
661 }
662 if (explicit)
663 *explicit = 0;
664 return "origin";
665 }
666
667 const char *pushremote_for_branch(struct branch *branch, int *explicit)
668 {
669 if (branch && branch->pushremote_name) {
670 if (explicit)
671 *explicit = 1;
672 return branch->pushremote_name;
673 }
674 if (pushremote_name) {
675 if (explicit)
676 *explicit = 1;
677 return pushremote_name;
678 }
679 return remote_for_branch(branch, explicit);
680 }
681
682 static struct remote *remote_get_1(const char *name,
683 const char *(*get_default)(struct branch *, int *))
684 {
685 struct remote *ret;
686 int name_given = 0;
687
688 read_config();
689
690 if (name)
691 name_given = 1;
692 else
693 name = get_default(current_branch, &name_given);
694
695 ret = make_remote(name, 0);
696 if (valid_remote_nick(name) && have_git_dir()) {
697 if (!valid_remote(ret))
698 read_remotes_file(ret);
699 if (!valid_remote(ret))
700 read_branches_file(ret);
701 }
702 if (name_given && !valid_remote(ret))
703 add_url_alias(ret, name);
704 if (!valid_remote(ret))
705 return NULL;
706 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
707 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
708 return ret;
709 }
710
711 struct remote *remote_get(const char *name)
712 {
713 return remote_get_1(name, remote_for_branch);
714 }
715
716 struct remote *pushremote_get(const char *name)
717 {
718 return remote_get_1(name, pushremote_for_branch);
719 }
720
721 int remote_is_configured(struct remote *remote, int in_repo)
722 {
723 if (!remote)
724 return 0;
725 if (in_repo)
726 return remote->configured_in_repo;
727 return !!remote->origin;
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, st_add4(sizeof(*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 = st_add3(sizeof(struct ref), strlen(ref->name), 1);
947 cpy = xmalloc(len);
948 memcpy(cpy, ref, len);
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 oidclr(&ref->new_oid);
1077 return ref;
1078 }
1079
1080 static int try_explicit_object_name(const char *name,
1081 struct ref **match)
1082 {
1083 struct object_id oid;
1084
1085 if (!*name) {
1086 if (match)
1087 *match = alloc_delete_ref();
1088 return 0;
1089 }
1090
1091 if (get_sha1(name, oid.hash))
1092 return -1;
1093
1094 if (match) {
1095 *match = alloc_ref(name);
1096 oidcpy(&(*match)->new_oid, &oid);
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 struct object_id oid;
1112
1113 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1114 oid.hash, 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 struct object_id oid;
1173 int flag;
1174
1175 dst_value = resolve_ref_unsafe(matched_src->name,
1176 RESOLVE_REF_READING,
1177 oid.hash, &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_oid(&matched_src->new_oid))
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 struct object_id *oid)
1294 {
1295 struct commit *commit;
1296
1297 if (is_null_oid(oid))
1298 return;
1299 commit = lookup_commit_reference_gently(oid->hash, 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_oid(&ref->peer_ref->new_oid))
1323 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1324 else
1325 add_to_tips(&sent_tips, &ref->old_oid);
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_oid.hash, 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_oid(&ref->new_oid))
1360 continue;
1361 commit = lookup_commit_reference_gently(ref->new_oid.hash, 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 oidcpy(&dst_ref->new_oid, &ref->new_oid);
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 oidcpy(&dst_peer->new_oid, &ref->new_oid);
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 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1535 else if (!send_mirror)
1536 continue;
1537
1538 ref->deletion = is_null_oid(&ref->new_oid);
1539 if (!ref->deletion &&
1540 !oidcmp(&ref->old_oid, &ref->new_oid)) {
1541 ref->status = REF_STATUS_UPTODATE;
1542 continue;
1543 }
1544
1545 /*
1546 * If the remote ref has moved and is now different
1547 * from what we expect, reject any push.
1548 *
1549 * It also is an error if the user told us to check
1550 * with the remote-tracking branch to find the value
1551 * to expect, but we did not have such a tracking
1552 * branch.
1553 */
1554 if (ref->expect_old_sha1) {
1555 if (oidcmp(&ref->old_oid, &ref->old_oid_expect))
1556 reject_reason = REF_STATUS_REJECT_STALE;
1557 else
1558 /* If the ref isn't stale then force the update. */
1559 force_ref_update = 1;
1560 }
1561
1562 /*
1563 * If the update isn't already rejected then check
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 if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1584 if (starts_with(ref->name, "refs/tags/"))
1585 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1586 else if (!has_object_file(&ref->old_oid))
1587 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1588 else if (!lookup_commit_reference_gently(ref->old_oid.hash, 1) ||
1589 !lookup_commit_reference_gently(ref->new_oid.hash, 1))
1590 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1591 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
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 struct object_id oid;
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 oid.hash, &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 remote = remote_get(pushremote_for_branch(branch, NULL));
1728 if (!remote)
1729 return error_buf(err,
1730 _("branch '%s' has no remote for pushing"),
1731 branch->name);
1732
1733 if (remote->push_refspec_nr) {
1734 char *dst;
1735 const char *ret;
1736
1737 dst = apply_refspecs(remote->push, remote->push_refspec_nr,
1738 branch->refname);
1739 if (!dst)
1740 return error_buf(err,
1741 _("push refspecs for '%s' do not include '%s'"),
1742 remote->name, branch->name);
1743
1744 ret = tracking_for_push_dest(remote, dst, err);
1745 free(dst);
1746 return ret;
1747 }
1748
1749 if (remote->mirror)
1750 return tracking_for_push_dest(remote, branch->refname, err);
1751
1752 switch (push_default) {
1753 case PUSH_DEFAULT_NOTHING:
1754 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1755
1756 case PUSH_DEFAULT_MATCHING:
1757 case PUSH_DEFAULT_CURRENT:
1758 return tracking_for_push_dest(remote, branch->refname, err);
1759
1760 case PUSH_DEFAULT_UPSTREAM:
1761 return branch_get_upstream(branch, err);
1762
1763 case PUSH_DEFAULT_UNSPECIFIED:
1764 case PUSH_DEFAULT_SIMPLE:
1765 {
1766 const char *up, *cur;
1767
1768 up = branch_get_upstream(branch, err);
1769 if (!up)
1770 return NULL;
1771 cur = tracking_for_push_dest(remote, branch->refname, err);
1772 if (!cur)
1773 return NULL;
1774 if (strcmp(cur, up))
1775 return error_buf(err,
1776 _("cannot resolve 'simple' push to a single destination"));
1777 return cur;
1778 }
1779 }
1780
1781 die("BUG: unhandled push situation");
1782 }
1783
1784 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1785 {
1786 if (!branch)
1787 return error_buf(err, _("HEAD does not point to a branch"));
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 struct object_id oid;
1797 int flag;
1798
1799 if (!resolve_ref_unsafe(refname, 0, oid.hash, &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_oid_hex(name, &ref_map->old_oid);
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 oidcpy(&ref->old_oid, &list->old_oid);
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 *commit = pop_commit(&list);
1941 commit->object.flags &= ~mark;
1942 }
1943 }
1944
1945 int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid)
1946 {
1947 struct object *o;
1948 struct commit *old, *new;
1949 struct commit_list *list, *used;
1950 int found = 0;
1951
1952 /*
1953 * Both new and old must be commit-ish and new is descendant of
1954 * old. Otherwise we require --force.
1955 */
1956 o = deref_tag(parse_object(old_oid->hash), NULL, 0);
1957 if (!o || o->type != OBJ_COMMIT)
1958 return 0;
1959 old = (struct commit *) o;
1960
1961 o = deref_tag(parse_object(new_oid->hash), NULL, 0);
1962 if (!o || o->type != OBJ_COMMIT)
1963 return 0;
1964 new = (struct commit *) o;
1965
1966 if (parse_commit(new) < 0)
1967 return 0;
1968
1969 used = list = NULL;
1970 commit_list_insert(new, &list);
1971 while (list) {
1972 new = pop_most_recent_commit(&list, TMP_MARK);
1973 commit_list_insert(new, &used);
1974 if (new == old) {
1975 found = 1;
1976 break;
1977 }
1978 }
1979 unmark_and_free(list, TMP_MARK);
1980 unmark_and_free(used, TMP_MARK);
1981 return found;
1982 }
1983
1984 /*
1985 * Compare a branch with its upstream, and save their differences (number
1986 * of commits) in *num_ours and *num_theirs. The name of the upstream branch
1987 * (or NULL if no upstream is defined) is returned via *upstream_name, if it
1988 * is not itself NULL.
1989 *
1990 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1991 * upstream defined, or ref does not exist), 0 otherwise.
1992 */
1993 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1994 const char **upstream_name)
1995 {
1996 struct object_id oid;
1997 struct commit *ours, *theirs;
1998 struct rev_info revs;
1999 const char *base;
2000 struct argv_array argv = ARGV_ARRAY_INIT;
2001
2002 /* Cannot stat unless we are marked to build on top of somebody else. */
2003 base = branch_get_upstream(branch, NULL);
2004 if (upstream_name)
2005 *upstream_name = base;
2006 if (!base)
2007 return -1;
2008
2009 /* Cannot stat if what we used to build on no longer exists */
2010 if (read_ref(base, oid.hash))
2011 return -1;
2012 theirs = lookup_commit_reference(oid.hash);
2013 if (!theirs)
2014 return -1;
2015
2016 if (read_ref(branch->refname, oid.hash))
2017 return -1;
2018 ours = lookup_commit_reference(oid.hash);
2019 if (!ours)
2020 return -1;
2021
2022 /* are we the same? */
2023 if (theirs == ours) {
2024 *num_theirs = *num_ours = 0;
2025 return 0;
2026 }
2027
2028 /* Run "rev-list --left-right ours...theirs" internally... */
2029 argv_array_push(&argv, ""); /* ignored */
2030 argv_array_push(&argv, "--left-right");
2031 argv_array_pushf(&argv, "%s...%s",
2032 oid_to_hex(&ours->object.oid),
2033 oid_to_hex(&theirs->object.oid));
2034 argv_array_push(&argv, "--");
2035
2036 init_revisions(&revs, NULL);
2037 setup_revisions(argv.argc, argv.argv, &revs, NULL);
2038 if (prepare_revision_walk(&revs))
2039 die("revision walk setup failed");
2040
2041 /* ... and count the commits on each side. */
2042 *num_ours = 0;
2043 *num_theirs = 0;
2044 while (1) {
2045 struct commit *c = get_revision(&revs);
2046 if (!c)
2047 break;
2048 if (c->object.flags & SYMMETRIC_LEFT)
2049 (*num_ours)++;
2050 else
2051 (*num_theirs)++;
2052 }
2053
2054 /* clear object flags smudged by the above traversal */
2055 clear_commit_marks(ours, ALL_REV_FLAGS);
2056 clear_commit_marks(theirs, ALL_REV_FLAGS);
2057
2058 argv_array_clear(&argv);
2059 return 0;
2060 }
2061
2062 /*
2063 * Return true when there is anything to report, otherwise false.
2064 */
2065 int format_tracking_info(struct branch *branch, struct strbuf *sb)
2066 {
2067 int ours, theirs;
2068 const char *full_base;
2069 char *base;
2070 int upstream_is_gone = 0;
2071
2072 if (stat_tracking_info(branch, &ours, &theirs, &full_base) < 0) {
2073 if (!full_base)
2074 return 0;
2075 upstream_is_gone = 1;
2076 }
2077
2078 base = shorten_unambiguous_ref(full_base, 0);
2079 if (upstream_is_gone) {
2080 strbuf_addf(sb,
2081 _("Your branch is based on '%s', but the upstream is gone.\n"),
2082 base);
2083 if (advice_status_hints)
2084 strbuf_addstr(sb,
2085 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
2086 } else if (!ours && !theirs) {
2087 strbuf_addf(sb,
2088 _("Your branch is up-to-date with '%s'.\n"),
2089 base);
2090 } else if (!theirs) {
2091 strbuf_addf(sb,
2092 Q_("Your branch is ahead of '%s' by %d commit.\n",
2093 "Your branch is ahead of '%s' by %d commits.\n",
2094 ours),
2095 base, ours);
2096 if (advice_status_hints)
2097 strbuf_addstr(sb,
2098 _(" (use \"git push\" to publish your local commits)\n"));
2099 } else if (!ours) {
2100 strbuf_addf(sb,
2101 Q_("Your branch is behind '%s' by %d commit, "
2102 "and can be fast-forwarded.\n",
2103 "Your branch is behind '%s' by %d commits, "
2104 "and can be fast-forwarded.\n",
2105 theirs),
2106 base, theirs);
2107 if (advice_status_hints)
2108 strbuf_addstr(sb,
2109 _(" (use \"git pull\" to update your local branch)\n"));
2110 } else {
2111 strbuf_addf(sb,
2112 Q_("Your branch and '%s' have diverged,\n"
2113 "and have %d and %d different commit each, "
2114 "respectively.\n",
2115 "Your branch and '%s' have diverged,\n"
2116 "and have %d and %d different commits each, "
2117 "respectively.\n",
2118 ours + theirs),
2119 base, ours, theirs);
2120 if (advice_status_hints)
2121 strbuf_addstr(sb,
2122 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2123 }
2124 free(base);
2125 return 1;
2126 }
2127
2128 static int one_local_ref(const char *refname, const struct object_id *oid,
2129 int flag, void *cb_data)
2130 {
2131 struct ref ***local_tail = cb_data;
2132 struct ref *ref;
2133
2134 /* we already know it starts with refs/ to get here */
2135 if (check_refname_format(refname + 5, 0))
2136 return 0;
2137
2138 ref = alloc_ref(refname);
2139 oidcpy(&ref->new_oid, oid);
2140 **local_tail = ref;
2141 *local_tail = &ref->next;
2142 return 0;
2143 }
2144
2145 struct ref *get_local_heads(void)
2146 {
2147 struct ref *local_refs = NULL, **local_tail = &local_refs;
2148
2149 for_each_ref(one_local_ref, &local_tail);
2150 return local_refs;
2151 }
2152
2153 struct ref *guess_remote_head(const struct ref *head,
2154 const struct ref *refs,
2155 int all)
2156 {
2157 const struct ref *r;
2158 struct ref *list = NULL;
2159 struct ref **tail = &list;
2160
2161 if (!head)
2162 return NULL;
2163
2164 /*
2165 * Some transports support directly peeking at
2166 * where HEAD points; if that is the case, then
2167 * we don't have to guess.
2168 */
2169 if (head->symref)
2170 return copy_ref(find_ref_by_name(refs, head->symref));
2171
2172 /* If refs/heads/master could be right, it is. */
2173 if (!all) {
2174 r = find_ref_by_name(refs, "refs/heads/master");
2175 if (r && !oidcmp(&r->old_oid, &head->old_oid))
2176 return copy_ref(r);
2177 }
2178
2179 /* Look for another ref that points there */
2180 for (r = refs; r; r = r->next) {
2181 if (r != head &&
2182 starts_with(r->name, "refs/heads/") &&
2183 !oidcmp(&r->old_oid, &head->old_oid)) {
2184 *tail = copy_ref(r);
2185 tail = &((*tail)->next);
2186 if (!all)
2187 break;
2188 }
2189 }
2190
2191 return list;
2192 }
2193
2194 struct stale_heads_info {
2195 struct string_list *ref_names;
2196 struct ref **stale_refs_tail;
2197 struct refspec *refs;
2198 int ref_count;
2199 };
2200
2201 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2202 int flags, void *cb_data)
2203 {
2204 struct stale_heads_info *info = cb_data;
2205 struct string_list matches = STRING_LIST_INIT_DUP;
2206 struct refspec query;
2207 int i, stale = 1;
2208 memset(&query, 0, sizeof(struct refspec));
2209 query.dst = (char *)refname;
2210
2211 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2212 if (matches.nr == 0)
2213 goto clean_exit; /* No matches */
2214
2215 /*
2216 * If we did find a suitable refspec and it's not a symref and
2217 * it's not in the list of refs that currently exist in that
2218 * remote, we consider it to be stale. In order to deal with
2219 * overlapping refspecs, we need to go over all of the
2220 * matching refs.
2221 */
2222 if (flags & REF_ISSYMREF)
2223 goto clean_exit;
2224
2225 for (i = 0; stale && i < matches.nr; i++)
2226 if (string_list_has_string(info->ref_names, matches.items[i].string))
2227 stale = 0;
2228
2229 if (stale) {
2230 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2231 oidcpy(&ref->new_oid, oid);
2232 }
2233
2234 clean_exit:
2235 string_list_clear(&matches, 0);
2236 return 0;
2237 }
2238
2239 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2240 {
2241 struct ref *ref, *stale_refs = NULL;
2242 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2243 struct stale_heads_info info;
2244
2245 info.ref_names = &ref_names;
2246 info.stale_refs_tail = &stale_refs;
2247 info.refs = refs;
2248 info.ref_count = ref_count;
2249 for (ref = fetch_map; ref; ref = ref->next)
2250 string_list_append(&ref_names, ref->name);
2251 string_list_sort(&ref_names);
2252 for_each_ref(get_stale_heads_cb, &info);
2253 string_list_clear(&ref_names, 0);
2254 return stale_refs;
2255 }
2256
2257 /*
2258 * Compare-and-swap
2259 */
2260 static void clear_cas_option(struct push_cas_option *cas)
2261 {
2262 int i;
2263
2264 for (i = 0; i < cas->nr; i++)
2265 free(cas->entry[i].refname);
2266 free(cas->entry);
2267 memset(cas, 0, sizeof(*cas));
2268 }
2269
2270 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2271 const char *refname,
2272 size_t refnamelen)
2273 {
2274 struct push_cas *entry;
2275 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2276 entry = &cas->entry[cas->nr++];
2277 memset(entry, 0, sizeof(*entry));
2278 entry->refname = xmemdupz(refname, refnamelen);
2279 return entry;
2280 }
2281
2282 int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2283 {
2284 const char *colon;
2285 struct push_cas *entry;
2286
2287 if (unset) {
2288 /* "--no-<option>" */
2289 clear_cas_option(cas);
2290 return 0;
2291 }
2292
2293 if (!arg) {
2294 /* just "--<option>" */
2295 cas->use_tracking_for_rest = 1;
2296 return 0;
2297 }
2298
2299 /* "--<option>=refname" or "--<option>=refname:value" */
2300 colon = strchrnul(arg, ':');
2301 entry = add_cas_entry(cas, arg, colon - arg);
2302 if (!*colon)
2303 entry->use_tracking = 1;
2304 else if (!colon[1])
2305 hashclr(entry->expect);
2306 else if (get_sha1(colon + 1, entry->expect))
2307 return error("cannot parse expected object name '%s'", colon + 1);
2308 return 0;
2309 }
2310
2311 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2312 {
2313 return parse_push_cas_option(opt->value, arg, unset);
2314 }
2315
2316 int is_empty_cas(const struct push_cas_option *cas)
2317 {
2318 return !cas->use_tracking_for_rest && !cas->nr;
2319 }
2320
2321 /*
2322 * Look at remote.fetch refspec and see if we have a remote
2323 * tracking branch for the refname there. Fill its current
2324 * value in sha1[].
2325 * If we cannot do so, return negative to signal an error.
2326 */
2327 static int remote_tracking(struct remote *remote, const char *refname,
2328 struct object_id *oid)
2329 {
2330 char *dst;
2331
2332 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2333 if (!dst)
2334 return -1; /* no tracking ref for refname at remote */
2335 if (read_ref(dst, oid->hash))
2336 return -1; /* we know what the tracking ref is but we cannot read it */
2337 return 0;
2338 }
2339
2340 static void apply_cas(struct push_cas_option *cas,
2341 struct remote *remote,
2342 struct ref *ref)
2343 {
2344 int i;
2345
2346 /* Find an explicit --<option>=<name>[:<value>] entry */
2347 for (i = 0; i < cas->nr; i++) {
2348 struct push_cas *entry = &cas->entry[i];
2349 if (!refname_match(entry->refname, ref->name))
2350 continue;
2351 ref->expect_old_sha1 = 1;
2352 if (!entry->use_tracking)
2353 hashcpy(ref->old_oid_expect.hash, cas->entry[i].expect);
2354 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2355 oidclr(&ref->old_oid_expect);
2356 return;
2357 }
2358
2359 /* Are we using "--<option>" to cover all? */
2360 if (!cas->use_tracking_for_rest)
2361 return;
2362
2363 ref->expect_old_sha1 = 1;
2364 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2365 oidclr(&ref->old_oid_expect);
2366 }
2367
2368 void apply_push_cas(struct push_cas_option *cas,
2369 struct remote *remote,
2370 struct ref *remote_refs)
2371 {
2372 struct ref *ref;
2373 for (ref = remote_refs; ref; ref = ref->next)
2374 apply_cas(cas, remote, ref);
2375 }
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