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Merge branch 'jk/rerere-xsnprintf'
[git/debian.git] / remote.c
blob02e698a5e05a02f8905ec511851eea15e86d746f
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->origin = REMOTE_REMOTES;
259 while (strbuf_getline(&buf, f) != EOF) {
260 const char *v;
261
262 strbuf_rtrim(&buf);
263
264 if (skip_prefix(buf.buf, "URL:", &v))
265 add_url_alias(remote, xstrdup(skip_spaces(v)));
266 else if (skip_prefix(buf.buf, "Push:", &v))
267 add_push_refspec(remote, xstrdup(skip_spaces(v)));
268 else if (skip_prefix(buf.buf, "Pull:", &v))
269 add_fetch_refspec(remote, xstrdup(skip_spaces(v)));
270 }
271 strbuf_release(&buf);
272 fclose(f);
273 }
274
275 static void read_branches_file(struct remote *remote)
276 {
277 char *frag;
278 struct strbuf buf = STRBUF_INIT;
279 FILE *f = fopen(git_path("branches/%s", remote->name), "r");
280
281 if (!f)
282 return;
283
284 strbuf_getline_lf(&buf, f);
285 fclose(f);
286 strbuf_trim(&buf);
287 if (!buf.len) {
288 strbuf_release(&buf);
289 return;
290 }
291
292 remote->origin = REMOTE_BRANCHES;
293
294 /*
295 * The branches file would have URL and optionally
296 * #branch specified. The "master" (or specified) branch is
297 * fetched and stored in the local branch matching the
298 * remote name.
299 */
300 frag = strchr(buf.buf, '#');
301 if (frag)
302 *(frag++) = '\0';
303 else
304 frag = "master";
305
306 add_url_alias(remote, strbuf_detach(&buf, NULL));
307 add_fetch_refspec(remote, xstrfmt("refs/heads/%s:refs/heads/%s",
308 frag, remote->name));
309
310 /*
311 * Cogito compatible push: push current HEAD to remote #branch
312 * (master if missing)
313 */
314 add_push_refspec(remote, xstrfmt("HEAD:refs/heads/%s", frag));
315 remote->fetch_tags = 1; /* always auto-follow */
316 }
317
318 static int handle_config(const char *key, const char *value, void *cb)
319 {
320 const char *name;
321 const char *subkey;
322 struct remote *remote;
323 struct branch *branch;
324 if (starts_with(key, "branch.")) {
325 name = key + 7;
326 subkey = strrchr(name, '.');
327 if (!subkey)
328 return 0;
329 branch = make_branch(name, subkey - name);
330 if (!strcmp(subkey, ".remote")) {
331 return git_config_string(&branch->remote_name, key, value);
332 } else if (!strcmp(subkey, ".pushremote")) {
333 return git_config_string(&branch->pushremote_name, key, value);
334 } else if (!strcmp(subkey, ".merge")) {
335 if (!value)
336 return config_error_nonbool(key);
337 add_merge(branch, xstrdup(value));
338 }
339 return 0;
340 }
341 if (starts_with(key, "url.")) {
342 struct rewrite *rewrite;
343 name = key + 4;
344 subkey = strrchr(name, '.');
345 if (!subkey)
346 return 0;
347 if (!strcmp(subkey, ".insteadof")) {
348 rewrite = make_rewrite(&rewrites, name, subkey - name);
349 if (!value)
350 return config_error_nonbool(key);
351 add_instead_of(rewrite, xstrdup(value));
352 } else if (!strcmp(subkey, ".pushinsteadof")) {
353 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
354 if (!value)
355 return config_error_nonbool(key);
356 add_instead_of(rewrite, xstrdup(value));
357 }
358 }
359
360 if (!starts_with(key, "remote."))
361 return 0;
362 name = key + 7;
363
364 /* Handle remote.* variables */
365 if (!strcmp(name, "pushdefault"))
366 return git_config_string(&pushremote_name, key, value);
367
368 /* Handle remote.<name>.* variables */
369 if (*name == '/') {
370 warning("Config remote shorthand cannot begin with '/': %s",
371 name);
372 return 0;
373 }
374 subkey = strrchr(name, '.');
375 if (!subkey)
376 return 0;
377 remote = make_remote(name, subkey - name);
378 remote->origin = REMOTE_CONFIG;
379 if (!strcmp(subkey, ".mirror"))
380 remote->mirror = git_config_bool(key, value);
381 else if (!strcmp(subkey, ".skipdefaultupdate"))
382 remote->skip_default_update = git_config_bool(key, value);
383 else if (!strcmp(subkey, ".skipfetchall"))
384 remote->skip_default_update = git_config_bool(key, value);
385 else if (!strcmp(subkey, ".prune"))
386 remote->prune = git_config_bool(key, value);
387 else if (!strcmp(subkey, ".url")) {
388 const char *v;
389 if (git_config_string(&v, key, value))
390 return -1;
391 add_url(remote, v);
392 } else if (!strcmp(subkey, ".pushurl")) {
393 const char *v;
394 if (git_config_string(&v, key, value))
395 return -1;
396 add_pushurl(remote, v);
397 } else if (!strcmp(subkey, ".push")) {
398 const char *v;
399 if (git_config_string(&v, key, value))
400 return -1;
401 add_push_refspec(remote, v);
402 } else if (!strcmp(subkey, ".fetch")) {
403 const char *v;
404 if (git_config_string(&v, key, value))
405 return -1;
406 add_fetch_refspec(remote, v);
407 } else if (!strcmp(subkey, ".receivepack")) {
408 const char *v;
409 if (git_config_string(&v, key, value))
410 return -1;
411 if (!remote->receivepack)
412 remote->receivepack = v;
413 else
414 error("more than one receivepack given, using the first");
415 } else if (!strcmp(subkey, ".uploadpack")) {
416 const char *v;
417 if (git_config_string(&v, key, value))
418 return -1;
419 if (!remote->uploadpack)
420 remote->uploadpack = v;
421 else
422 error("more than one uploadpack given, using the first");
423 } else if (!strcmp(subkey, ".tagopt")) {
424 if (!strcmp(value, "--no-tags"))
425 remote->fetch_tags = -1;
426 else if (!strcmp(value, "--tags"))
427 remote->fetch_tags = 2;
428 } else if (!strcmp(subkey, ".proxy")) {
429 return git_config_string((const char **)&remote->http_proxy,
430 key, value);
431 } else if (!strcmp(subkey, ".proxyauthmethod")) {
432 return git_config_string((const char **)&remote->http_proxy_authmethod,
433 key, value);
434 } else if (!strcmp(subkey, ".vcs")) {
435 return git_config_string(&remote->foreign_vcs, key, value);
436 }
437 return 0;
438 }
439
440 static void alias_all_urls(void)
441 {
442 int i, j;
443 for (i = 0; i < remotes_nr; i++) {
444 int add_pushurl_aliases;
445 if (!remotes[i])
446 continue;
447 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
448 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
449 }
450 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
451 for (j = 0; j < remotes[i]->url_nr; j++) {
452 if (add_pushurl_aliases)
453 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
454 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
455 }
456 }
457 }
458
459 static void read_config(void)
460 {
461 static int loaded;
462 struct object_id oid;
463 const char *head_ref;
464 int flag;
465
466 if (loaded)
467 return;
468 loaded = 1;
469
470 current_branch = NULL;
471 head_ref = resolve_ref_unsafe("HEAD", 0, oid.hash, &flag);
472 if (head_ref && (flag & REF_ISSYMREF) &&
473 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
474 current_branch = make_branch(head_ref, 0);
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)) {
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(const char *name)
722 {
723 struct remotes_hash_key lookup;
724 struct hashmap_entry lookup_entry;
725 read_config();
726
727 init_remotes_hash();
728 lookup.str = name;
729 lookup.len = strlen(name);
730 hashmap_entry_init(&lookup_entry, memhash(name, lookup.len));
731
732 return hashmap_get(&remotes_hash, &lookup_entry, &lookup) != NULL;
733 }
734
735 int for_each_remote(each_remote_fn fn, void *priv)
736 {
737 int i, result = 0;
738 read_config();
739 for (i = 0; i < remotes_nr && !result; i++) {
740 struct remote *r = remotes[i];
741 if (!r)
742 continue;
743 if (!r->fetch)
744 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
745 r->fetch_refspec);
746 if (!r->push)
747 r->push = parse_push_refspec(r->push_refspec_nr,
748 r->push_refspec);
749 result = fn(r, priv);
750 }
751 return result;
752 }
753
754 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
755 {
756 if (strcmp(ref1->name, ref2->name)) {
757 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
758 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
759 die(_("Cannot fetch both %s and %s to %s"),
760 ref1->name, ref2->name, ref2->peer_ref->name);
761 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
762 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
763 warning(_("%s usually tracks %s, not %s"),
764 ref2->peer_ref->name, ref2->name, ref1->name);
765 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
766 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
767 die(_("%s tracks both %s and %s"),
768 ref2->peer_ref->name, ref1->name, ref2->name);
769 } else {
770 /*
771 * This last possibility doesn't occur because
772 * FETCH_HEAD_IGNORE entries always appear at
773 * the end of the list.
774 */
775 die(_("Internal error"));
776 }
777 }
778 free(ref2->peer_ref);
779 free(ref2);
780 }
781
782 struct ref *ref_remove_duplicates(struct ref *ref_map)
783 {
784 struct string_list refs = STRING_LIST_INIT_NODUP;
785 struct ref *retval = NULL;
786 struct ref **p = &retval;
787
788 while (ref_map) {
789 struct ref *ref = ref_map;
790
791 ref_map = ref_map->next;
792 ref->next = NULL;
793
794 if (!ref->peer_ref) {
795 *p = ref;
796 p = &ref->next;
797 } else {
798 struct string_list_item *item =
799 string_list_insert(&refs, ref->peer_ref->name);
800
801 if (item->util) {
802 /* Entry already existed */
803 handle_duplicate((struct ref *)item->util, ref);
804 } else {
805 *p = ref;
806 p = &ref->next;
807 item->util = ref;
808 }
809 }
810 }
811
812 string_list_clear(&refs, 0);
813 return retval;
814 }
815
816 int remote_has_url(struct remote *remote, const char *url)
817 {
818 int i;
819 for (i = 0; i < remote->url_nr; i++) {
820 if (!strcmp(remote->url[i], url))
821 return 1;
822 }
823 return 0;
824 }
825
826 static int match_name_with_pattern(const char *key, const char *name,
827 const char *value, char **result)
828 {
829 const char *kstar = strchr(key, '*');
830 size_t klen;
831 size_t ksuffixlen;
832 size_t namelen;
833 int ret;
834 if (!kstar)
835 die("Key '%s' of pattern had no '*'", key);
836 klen = kstar - key;
837 ksuffixlen = strlen(kstar + 1);
838 namelen = strlen(name);
839 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
840 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
841 if (ret && value) {
842 struct strbuf sb = STRBUF_INIT;
843 const char *vstar = strchr(value, '*');
844 if (!vstar)
845 die("Value '%s' of pattern has no '*'", value);
846 strbuf_add(&sb, value, vstar - value);
847 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
848 strbuf_addstr(&sb, vstar + 1);
849 *result = strbuf_detach(&sb, NULL);
850 }
851 return ret;
852 }
853
854 static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
855 {
856 int i;
857 int find_src = !query->src;
858
859 if (find_src && !query->dst)
860 error("query_refspecs_multiple: need either src or dst");
861
862 for (i = 0; i < ref_count; i++) {
863 struct refspec *refspec = &refs[i];
864 const char *key = find_src ? refspec->dst : refspec->src;
865 const char *value = find_src ? refspec->src : refspec->dst;
866 const char *needle = find_src ? query->dst : query->src;
867 char **result = find_src ? &query->src : &query->dst;
868
869 if (!refspec->dst)
870 continue;
871 if (refspec->pattern) {
872 if (match_name_with_pattern(key, needle, value, result))
873 string_list_append_nodup(results, *result);
874 } else if (!strcmp(needle, key)) {
875 string_list_append(results, value);
876 }
877 }
878 }
879
880 int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
881 {
882 int i;
883 int find_src = !query->src;
884 const char *needle = find_src ? query->dst : query->src;
885 char **result = find_src ? &query->src : &query->dst;
886
887 if (find_src && !query->dst)
888 return error("query_refspecs: need either src or dst");
889
890 for (i = 0; i < ref_count; i++) {
891 struct refspec *refspec = &refs[i];
892 const char *key = find_src ? refspec->dst : refspec->src;
893 const char *value = find_src ? refspec->src : refspec->dst;
894
895 if (!refspec->dst)
896 continue;
897 if (refspec->pattern) {
898 if (match_name_with_pattern(key, needle, value, result)) {
899 query->force = refspec->force;
900 return 0;
901 }
902 } else if (!strcmp(needle, key)) {
903 *result = xstrdup(value);
904 query->force = refspec->force;
905 return 0;
906 }
907 }
908 return -1;
909 }
910
911 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
912 const char *name)
913 {
914 struct refspec query;
915
916 memset(&query, 0, sizeof(struct refspec));
917 query.src = (char *)name;
918
919 if (query_refspecs(refspecs, nr_refspec, &query))
920 return NULL;
921
922 return query.dst;
923 }
924
925 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
926 {
927 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
928 }
929
930 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
931 const char *name)
932 {
933 size_t len = strlen(name);
934 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
935 memcpy(ref->name, prefix, prefixlen);
936 memcpy(ref->name + prefixlen, name, len);
937 return ref;
938 }
939
940 struct ref *alloc_ref(const char *name)
941 {
942 return alloc_ref_with_prefix("", 0, name);
943 }
944
945 struct ref *copy_ref(const struct ref *ref)
946 {
947 struct ref *cpy;
948 size_t len;
949 if (!ref)
950 return NULL;
951 len = strlen(ref->name);
952 cpy = xmalloc(sizeof(struct ref) + len + 1);
953 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
954 cpy->next = NULL;
955 cpy->symref = xstrdup_or_null(ref->symref);
956 cpy->remote_status = xstrdup_or_null(ref->remote_status);
957 cpy->peer_ref = copy_ref(ref->peer_ref);
958 return cpy;
959 }
960
961 struct ref *copy_ref_list(const struct ref *ref)
962 {
963 struct ref *ret = NULL;
964 struct ref **tail = &ret;
965 while (ref) {
966 *tail = copy_ref(ref);
967 ref = ref->next;
968 tail = &((*tail)->next);
969 }
970 return ret;
971 }
972
973 static void free_ref(struct ref *ref)
974 {
975 if (!ref)
976 return;
977 free_ref(ref->peer_ref);
978 free(ref->remote_status);
979 free(ref->symref);
980 free(ref);
981 }
982
983 void free_refs(struct ref *ref)
984 {
985 struct ref *next;
986 while (ref) {
987 next = ref->next;
988 free_ref(ref);
989 ref = next;
990 }
991 }
992
993 int ref_compare_name(const void *va, const void *vb)
994 {
995 const struct ref *a = va, *b = vb;
996 return strcmp(a->name, b->name);
997 }
998
999 static void *ref_list_get_next(const void *a)
1000 {
1001 return ((const struct ref *)a)->next;
1002 }
1003
1004 static void ref_list_set_next(void *a, void *next)
1005 {
1006 ((struct ref *)a)->next = next;
1007 }
1008
1009 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
1010 {
1011 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
1012 }
1013
1014 int count_refspec_match(const char *pattern,
1015 struct ref *refs,
1016 struct ref **matched_ref)
1017 {
1018 int patlen = strlen(pattern);
1019 struct ref *matched_weak = NULL;
1020 struct ref *matched = NULL;
1021 int weak_match = 0;
1022 int match = 0;
1023
1024 for (weak_match = match = 0; refs; refs = refs->next) {
1025 char *name = refs->name;
1026 int namelen = strlen(name);
1027
1028 if (!refname_match(pattern, name))
1029 continue;
1030
1031 /* A match is "weak" if it is with refs outside
1032 * heads or tags, and did not specify the pattern
1033 * in full (e.g. "refs/remotes/origin/master") or at
1034 * least from the toplevel (e.g. "remotes/origin/master");
1035 * otherwise "git push $URL master" would result in
1036 * ambiguity between remotes/origin/master and heads/master
1037 * at the remote site.
1038 */
1039 if (namelen != patlen &&
1040 patlen != namelen - 5 &&
1041 !starts_with(name, "refs/heads/") &&
1042 !starts_with(name, "refs/tags/")) {
1043 /* We want to catch the case where only weak
1044 * matches are found and there are multiple
1045 * matches, and where more than one strong
1046 * matches are found, as ambiguous. One
1047 * strong match with zero or more weak matches
1048 * are acceptable as a unique match.
1049 */
1050 matched_weak = refs;
1051 weak_match++;
1052 }
1053 else {
1054 matched = refs;
1055 match++;
1056 }
1057 }
1058 if (!matched) {
1059 if (matched_ref)
1060 *matched_ref = matched_weak;
1061 return weak_match;
1062 }
1063 else {
1064 if (matched_ref)
1065 *matched_ref = matched;
1066 return match;
1067 }
1068 }
1069
1070 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1071 {
1072 **tail = ref;
1073 while (ref->next)
1074 ref = ref->next;
1075 *tail = &ref->next;
1076 }
1077
1078 static struct ref *alloc_delete_ref(void)
1079 {
1080 struct ref *ref = alloc_ref("(delete)");
1081 oidclr(&ref->new_oid);
1082 return ref;
1083 }
1084
1085 static int try_explicit_object_name(const char *name,
1086 struct ref **match)
1087 {
1088 struct object_id oid;
1089
1090 if (!*name) {
1091 if (match)
1092 *match = alloc_delete_ref();
1093 return 0;
1094 }
1095
1096 if (get_sha1(name, oid.hash))
1097 return -1;
1098
1099 if (match) {
1100 *match = alloc_ref(name);
1101 oidcpy(&(*match)->new_oid, &oid);
1102 }
1103 return 0;
1104 }
1105
1106 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1107 {
1108 struct ref *ret = alloc_ref(name);
1109 tail_link_ref(ret, tail);
1110 return ret;
1111 }
1112
1113 static char *guess_ref(const char *name, struct ref *peer)
1114 {
1115 struct strbuf buf = STRBUF_INIT;
1116 struct object_id oid;
1117
1118 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1119 oid.hash, NULL);
1120 if (!r)
1121 return NULL;
1122
1123 if (starts_with(r, "refs/heads/"))
1124 strbuf_addstr(&buf, "refs/heads/");
1125 else if (starts_with(r, "refs/tags/"))
1126 strbuf_addstr(&buf, "refs/tags/");
1127 else
1128 return NULL;
1129
1130 strbuf_addstr(&buf, name);
1131 return strbuf_detach(&buf, NULL);
1132 }
1133
1134 static int match_explicit_lhs(struct ref *src,
1135 struct refspec *rs,
1136 struct ref **match,
1137 int *allocated_match)
1138 {
1139 switch (count_refspec_match(rs->src, src, match)) {
1140 case 1:
1141 if (allocated_match)
1142 *allocated_match = 0;
1143 return 0;
1144 case 0:
1145 /* The source could be in the get_sha1() format
1146 * not a reference name. :refs/other is a
1147 * way to delete 'other' ref at the remote end.
1148 */
1149 if (try_explicit_object_name(rs->src, match) < 0)
1150 return error("src refspec %s does not match any.", rs->src);
1151 if (allocated_match)
1152 *allocated_match = 1;
1153 return 0;
1154 default:
1155 return error("src refspec %s matches more than one.", rs->src);
1156 }
1157 }
1158
1159 static int match_explicit(struct ref *src, struct ref *dst,
1160 struct ref ***dst_tail,
1161 struct refspec *rs)
1162 {
1163 struct ref *matched_src, *matched_dst;
1164 int allocated_src;
1165
1166 const char *dst_value = rs->dst;
1167 char *dst_guess;
1168
1169 if (rs->pattern || rs->matching)
1170 return 0;
1171
1172 matched_src = matched_dst = NULL;
1173 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1174 return -1;
1175
1176 if (!dst_value) {
1177 struct object_id oid;
1178 int flag;
1179
1180 dst_value = resolve_ref_unsafe(matched_src->name,
1181 RESOLVE_REF_READING,
1182 oid.hash, &flag);
1183 if (!dst_value ||
1184 ((flag & REF_ISSYMREF) &&
1185 !starts_with(dst_value, "refs/heads/")))
1186 die("%s cannot be resolved to branch.",
1187 matched_src->name);
1188 }
1189
1190 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1191 case 1:
1192 break;
1193 case 0:
1194 if (starts_with(dst_value, "refs/"))
1195 matched_dst = make_linked_ref(dst_value, dst_tail);
1196 else if (is_null_oid(&matched_src->new_oid))
1197 error("unable to delete '%s': remote ref does not exist",
1198 dst_value);
1199 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1200 matched_dst = make_linked_ref(dst_guess, dst_tail);
1201 else
1202 error("unable to push to unqualified destination: %s\n"
1203 "The destination refspec neither matches an "
1204 "existing ref on the remote nor\n"
1205 "begins with refs/, and we are unable to "
1206 "guess a prefix based on the source ref.",
1207 dst_value);
1208 break;
1209 default:
1210 matched_dst = NULL;
1211 error("dst refspec %s matches more than one.",
1212 dst_value);
1213 break;
1214 }
1215 if (!matched_dst)
1216 return -1;
1217 if (matched_dst->peer_ref)
1218 return error("dst ref %s receives from more than one src.",
1219 matched_dst->name);
1220 else {
1221 matched_dst->peer_ref = allocated_src ?
1222 matched_src :
1223 copy_ref(matched_src);
1224 matched_dst->force = rs->force;
1225 }
1226 return 0;
1227 }
1228
1229 static int match_explicit_refs(struct ref *src, struct ref *dst,
1230 struct ref ***dst_tail, struct refspec *rs,
1231 int rs_nr)
1232 {
1233 int i, errs;
1234 for (i = errs = 0; i < rs_nr; i++)
1235 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1236 return errs;
1237 }
1238
1239 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1240 int send_mirror, int direction, const struct refspec **ret_pat)
1241 {
1242 const struct refspec *pat;
1243 char *name;
1244 int i;
1245 int matching_refs = -1;
1246 for (i = 0; i < rs_nr; i++) {
1247 if (rs[i].matching &&
1248 (matching_refs == -1 || rs[i].force)) {
1249 matching_refs = i;
1250 continue;
1251 }
1252
1253 if (rs[i].pattern) {
1254 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1255 int match;
1256 if (direction == FROM_SRC)
1257 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1258 else
1259 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1260 if (match) {
1261 matching_refs = i;
1262 break;
1263 }
1264 }
1265 }
1266 if (matching_refs == -1)
1267 return NULL;
1268
1269 pat = rs + matching_refs;
1270 if (pat->matching) {
1271 /*
1272 * "matching refs"; traditionally we pushed everything
1273 * including refs outside refs/heads/ hierarchy, but
1274 * that does not make much sense these days.
1275 */
1276 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1277 return NULL;
1278 name = xstrdup(ref->name);
1279 }
1280 if (ret_pat)
1281 *ret_pat = pat;
1282 return name;
1283 }
1284
1285 static struct ref **tail_ref(struct ref **head)
1286 {
1287 struct ref **tail = head;
1288 while (*tail)
1289 tail = &((*tail)->next);
1290 return tail;
1291 }
1292
1293 struct tips {
1294 struct commit **tip;
1295 int nr, alloc;
1296 };
1297
1298 static void add_to_tips(struct tips *tips, const struct object_id *oid)
1299 {
1300 struct commit *commit;
1301
1302 if (is_null_oid(oid))
1303 return;
1304 commit = lookup_commit_reference_gently(oid->hash, 1);
1305 if (!commit || (commit->object.flags & TMP_MARK))
1306 return;
1307 commit->object.flags |= TMP_MARK;
1308 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1309 tips->tip[tips->nr++] = commit;
1310 }
1311
1312 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1313 {
1314 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1315 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1316 struct string_list_item *item;
1317 struct ref *ref;
1318 struct tips sent_tips;
1319
1320 /*
1321 * Collect everything we know they would have at the end of
1322 * this push, and collect all tags they have.
1323 */
1324 memset(&sent_tips, 0, sizeof(sent_tips));
1325 for (ref = *dst; ref; ref = ref->next) {
1326 if (ref->peer_ref &&
1327 !is_null_oid(&ref->peer_ref->new_oid))
1328 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1329 else
1330 add_to_tips(&sent_tips, &ref->old_oid);
1331 if (starts_with(ref->name, "refs/tags/"))
1332 string_list_append(&dst_tag, ref->name);
1333 }
1334 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1335
1336 string_list_sort(&dst_tag);
1337
1338 /* Collect tags they do not have. */
1339 for (ref = src; ref; ref = ref->next) {
1340 if (!starts_with(ref->name, "refs/tags/"))
1341 continue; /* not a tag */
1342 if (string_list_has_string(&dst_tag, ref->name))
1343 continue; /* they already have it */
1344 if (sha1_object_info(ref->new_oid.hash, NULL) != OBJ_TAG)
1345 continue; /* be conservative */
1346 item = string_list_append(&src_tag, ref->name);
1347 item->util = ref;
1348 }
1349 string_list_clear(&dst_tag, 0);
1350
1351 /*
1352 * At this point, src_tag lists tags that are missing from
1353 * dst, and sent_tips lists the tips we are pushing or those
1354 * that we know they already have. An element in the src_tag
1355 * that is an ancestor of any of the sent_tips needs to be
1356 * sent to the other side.
1357 */
1358 if (sent_tips.nr) {
1359 for_each_string_list_item(item, &src_tag) {
1360 struct ref *ref = item->util;
1361 struct ref *dst_ref;
1362 struct commit *commit;
1363
1364 if (is_null_oid(&ref->new_oid))
1365 continue;
1366 commit = lookup_commit_reference_gently(ref->new_oid.hash, 1);
1367 if (!commit)
1368 /* not pushing a commit, which is not an error */
1369 continue;
1370
1371 /*
1372 * Is this tag, which they do not have, reachable from
1373 * any of the commits we are sending?
1374 */
1375 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1376 continue;
1377
1378 /* Add it in */
1379 dst_ref = make_linked_ref(ref->name, dst_tail);
1380 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1381 dst_ref->peer_ref = copy_ref(ref);
1382 }
1383 }
1384 string_list_clear(&src_tag, 0);
1385 free(sent_tips.tip);
1386 }
1387
1388 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1389 {
1390 for ( ; list; list = list->next)
1391 if (!strcmp(list->name, name))
1392 return (struct ref *)list;
1393 return NULL;
1394 }
1395
1396 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1397 {
1398 for ( ; ref; ref = ref->next)
1399 string_list_append_nodup(ref_index, ref->name)->util = ref;
1400
1401 string_list_sort(ref_index);
1402 }
1403
1404 /*
1405 * Given only the set of local refs, sanity-check the set of push
1406 * refspecs. We can't catch all errors that match_push_refs would,
1407 * but we can catch some errors early before even talking to the
1408 * remote side.
1409 */
1410 int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1411 {
1412 struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1413 int ret = 0;
1414 int i;
1415
1416 for (i = 0; i < nr_refspec; i++) {
1417 struct refspec *rs = refspec + i;
1418
1419 if (rs->pattern || rs->matching)
1420 continue;
1421
1422 ret |= match_explicit_lhs(src, rs, NULL, NULL);
1423 }
1424
1425 free_refspec(nr_refspec, refspec);
1426 return ret;
1427 }
1428
1429 /*
1430 * Given the set of refs the local repository has, the set of refs the
1431 * remote repository has, and the refspec used for push, determine
1432 * what remote refs we will update and with what value by setting
1433 * peer_ref (which object is being pushed) and force (if the push is
1434 * forced) in elements of "dst". The function may add new elements to
1435 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1436 */
1437 int match_push_refs(struct ref *src, struct ref **dst,
1438 int nr_refspec, const char **refspec, int flags)
1439 {
1440 struct refspec *rs;
1441 int send_all = flags & MATCH_REFS_ALL;
1442 int send_mirror = flags & MATCH_REFS_MIRROR;
1443 int send_prune = flags & MATCH_REFS_PRUNE;
1444 int errs;
1445 static const char *default_refspec[] = { ":", NULL };
1446 struct ref *ref, **dst_tail = tail_ref(dst);
1447 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1448
1449 if (!nr_refspec) {
1450 nr_refspec = 1;
1451 refspec = default_refspec;
1452 }
1453 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1454 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1455
1456 /* pick the remainder */
1457 for (ref = src; ref; ref = ref->next) {
1458 struct string_list_item *dst_item;
1459 struct ref *dst_peer;
1460 const struct refspec *pat = NULL;
1461 char *dst_name;
1462
1463 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1464 if (!dst_name)
1465 continue;
1466
1467 if (!dst_ref_index.nr)
1468 prepare_ref_index(&dst_ref_index, *dst);
1469
1470 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1471 dst_peer = dst_item ? dst_item->util : NULL;
1472 if (dst_peer) {
1473 if (dst_peer->peer_ref)
1474 /* We're already sending something to this ref. */
1475 goto free_name;
1476 } else {
1477 if (pat->matching && !(send_all || send_mirror))
1478 /*
1479 * Remote doesn't have it, and we have no
1480 * explicit pattern, and we don't have
1481 * --all or --mirror.
1482 */
1483 goto free_name;
1484
1485 /* Create a new one and link it */
1486 dst_peer = make_linked_ref(dst_name, &dst_tail);
1487 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1488 string_list_insert(&dst_ref_index,
1489 dst_peer->name)->util = dst_peer;
1490 }
1491 dst_peer->peer_ref = copy_ref(ref);
1492 dst_peer->force = pat->force;
1493 free_name:
1494 free(dst_name);
1495 }
1496
1497 string_list_clear(&dst_ref_index, 0);
1498
1499 if (flags & MATCH_REFS_FOLLOW_TAGS)
1500 add_missing_tags(src, dst, &dst_tail);
1501
1502 if (send_prune) {
1503 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1504 /* check for missing refs on the remote */
1505 for (ref = *dst; ref; ref = ref->next) {
1506 char *src_name;
1507
1508 if (ref->peer_ref)
1509 /* We're already sending something to this ref. */
1510 continue;
1511
1512 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1513 if (src_name) {
1514 if (!src_ref_index.nr)
1515 prepare_ref_index(&src_ref_index, src);
1516 if (!string_list_has_string(&src_ref_index,
1517 src_name))
1518 ref->peer_ref = alloc_delete_ref();
1519 free(src_name);
1520 }
1521 }
1522 string_list_clear(&src_ref_index, 0);
1523 }
1524 if (errs)
1525 return -1;
1526 return 0;
1527 }
1528
1529 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1530 int force_update)
1531 {
1532 struct ref *ref;
1533
1534 for (ref = remote_refs; ref; ref = ref->next) {
1535 int force_ref_update = ref->force || force_update;
1536 int reject_reason = 0;
1537
1538 if (ref->peer_ref)
1539 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1540 else if (!send_mirror)
1541 continue;
1542
1543 ref->deletion = is_null_oid(&ref->new_oid);
1544 if (!ref->deletion &&
1545 !oidcmp(&ref->old_oid, &ref->new_oid)) {
1546 ref->status = REF_STATUS_UPTODATE;
1547 continue;
1548 }
1549
1550 /*
1551 * If the remote ref has moved and is now different
1552 * from what we expect, reject any push.
1553 *
1554 * It also is an error if the user told us to check
1555 * with the remote-tracking branch to find the value
1556 * to expect, but we did not have such a tracking
1557 * branch.
1558 */
1559 if (ref->expect_old_sha1) {
1560 if (ref->expect_old_no_trackback ||
1561 oidcmp(&ref->old_oid, &ref->old_oid_expect))
1562 reject_reason = REF_STATUS_REJECT_STALE;
1563 else
1564 /* If the ref isn't stale then force the update. */
1565 force_ref_update = 1;
1566 }
1567
1568 /*
1569 * If the update isn't already rejected then check
1570 * the usual "must fast-forward" rules.
1571 *
1572 * Decide whether an individual refspec A:B can be
1573 * pushed. The push will succeed if any of the
1574 * following are true:
1575 *
1576 * (1) the remote reference B does not exist
1577 *
1578 * (2) the remote reference B is being removed (i.e.,
1579 * pushing :B where no source is specified)
1580 *
1581 * (3) the destination is not under refs/tags/, and
1582 * if the old and new value is a commit, the new
1583 * is a descendant of the old.
1584 *
1585 * (4) it is forced using the +A:B notation, or by
1586 * passing the --force argument
1587 */
1588
1589 if (!reject_reason && !ref->deletion && !is_null_oid(&ref->old_oid)) {
1590 if (starts_with(ref->name, "refs/tags/"))
1591 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1592 else if (!has_object_file(&ref->old_oid))
1593 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1594 else if (!lookup_commit_reference_gently(ref->old_oid.hash, 1) ||
1595 !lookup_commit_reference_gently(ref->new_oid.hash, 1))
1596 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1597 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1598 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1599 }
1600
1601 /*
1602 * "--force" will defeat any rejection implemented
1603 * by the rules above.
1604 */
1605 if (!force_ref_update)
1606 ref->status = reject_reason;
1607 else if (reject_reason)
1608 ref->forced_update = 1;
1609 }
1610 }
1611
1612 static void set_merge(struct branch *ret)
1613 {
1614 struct remote *remote;
1615 char *ref;
1616 struct object_id oid;
1617 int i;
1618
1619 if (!ret)
1620 return; /* no branch */
1621 if (ret->merge)
1622 return; /* already run */
1623 if (!ret->remote_name || !ret->merge_nr) {
1624 /*
1625 * no merge config; let's make sure we don't confuse callers
1626 * with a non-zero merge_nr but a NULL merge
1627 */
1628 ret->merge_nr = 0;
1629 return;
1630 }
1631
1632 remote = remote_get(ret->remote_name);
1633
1634 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1635 for (i = 0; i < ret->merge_nr; i++) {
1636 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1637 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1638 if (!remote_find_tracking(remote, ret->merge[i]) ||
1639 strcmp(ret->remote_name, "."))
1640 continue;
1641 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1642 oid.hash, &ref) == 1)
1643 ret->merge[i]->dst = ref;
1644 else
1645 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1646 }
1647 }
1648
1649 struct branch *branch_get(const char *name)
1650 {
1651 struct branch *ret;
1652
1653 read_config();
1654 if (!name || !*name || !strcmp(name, "HEAD"))
1655 ret = current_branch;
1656 else
1657 ret = make_branch(name, 0);
1658 set_merge(ret);
1659 return ret;
1660 }
1661
1662 int branch_has_merge_config(struct branch *branch)
1663 {
1664 return branch && !!branch->merge;
1665 }
1666
1667 int branch_merge_matches(struct branch *branch,
1668 int i,
1669 const char *refname)
1670 {
1671 if (!branch || i < 0 || i >= branch->merge_nr)
1672 return 0;
1673 return refname_match(branch->merge[i]->src, refname);
1674 }
1675
1676 __attribute((format (printf,2,3)))
1677 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1678 {
1679 if (err) {
1680 va_list ap;
1681 va_start(ap, fmt);
1682 strbuf_vaddf(err, fmt, ap);
1683 va_end(ap);
1684 }
1685 return NULL;
1686 }
1687
1688 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1689 {
1690 if (!branch)
1691 return error_buf(err, _("HEAD does not point to a branch"));
1692
1693 if (!branch->merge || !branch->merge[0]) {
1694 /*
1695 * no merge config; is it because the user didn't define any,
1696 * or because it is not a real branch, and get_branch
1697 * auto-vivified it?
1698 */
1699 if (!ref_exists(branch->refname))
1700 return error_buf(err, _("no such branch: '%s'"),
1701 branch->name);
1702 return error_buf(err,
1703 _("no upstream configured for branch '%s'"),
1704 branch->name);
1705 }
1706
1707 if (!branch->merge[0]->dst)
1708 return error_buf(err,
1709 _("upstream branch '%s' not stored as a remote-tracking branch"),
1710 branch->merge[0]->src);
1711
1712 return branch->merge[0]->dst;
1713 }
1714
1715 static const char *tracking_for_push_dest(struct remote *remote,
1716 const char *refname,
1717 struct strbuf *err)
1718 {
1719 char *ret;
1720
1721 ret = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
1722 if (!ret)
1723 return error_buf(err,
1724 _("push destination '%s' on remote '%s' has no local tracking branch"),
1725 refname, remote->name);
1726 return ret;
1727 }
1728
1729 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1730 {
1731 struct remote *remote;
1732
1733 if (!branch)
1734 return error_buf(err, _("HEAD does not point to a branch"));
1735
1736 remote = remote_get(pushremote_for_branch(branch, NULL));
1737 if (!remote)
1738 return error_buf(err,
1739 _("branch '%s' has no remote for pushing"),
1740 branch->name);
1741
1742 if (remote->push_refspec_nr) {
1743 char *dst;
1744 const char *ret;
1745
1746 dst = apply_refspecs(remote->push, remote->push_refspec_nr,
1747 branch->refname);
1748 if (!dst)
1749 return error_buf(err,
1750 _("push refspecs for '%s' do not include '%s'"),
1751 remote->name, branch->name);
1752
1753 ret = tracking_for_push_dest(remote, dst, err);
1754 free(dst);
1755 return ret;
1756 }
1757
1758 if (remote->mirror)
1759 return tracking_for_push_dest(remote, branch->refname, err);
1760
1761 switch (push_default) {
1762 case PUSH_DEFAULT_NOTHING:
1763 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1764
1765 case PUSH_DEFAULT_MATCHING:
1766 case PUSH_DEFAULT_CURRENT:
1767 return tracking_for_push_dest(remote, branch->refname, err);
1768
1769 case PUSH_DEFAULT_UPSTREAM:
1770 return branch_get_upstream(branch, err);
1771
1772 case PUSH_DEFAULT_UNSPECIFIED:
1773 case PUSH_DEFAULT_SIMPLE:
1774 {
1775 const char *up, *cur;
1776
1777 up = branch_get_upstream(branch, err);
1778 if (!up)
1779 return NULL;
1780 cur = tracking_for_push_dest(remote, branch->refname, err);
1781 if (!cur)
1782 return NULL;
1783 if (strcmp(cur, up))
1784 return error_buf(err,
1785 _("cannot resolve 'simple' push to a single destination"));
1786 return cur;
1787 }
1788 }
1789
1790 die("BUG: unhandled push situation");
1791 }
1792
1793 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1794 {
1795 if (!branch->push_tracking_ref)
1796 branch->push_tracking_ref = branch_get_push_1(branch, err);
1797 return branch->push_tracking_ref;
1798 }
1799
1800 static int ignore_symref_update(const char *refname)
1801 {
1802 struct object_id oid;
1803 int flag;
1804
1805 if (!resolve_ref_unsafe(refname, 0, oid.hash, &flag))
1806 return 0; /* non-existing refs are OK */
1807 return (flag & REF_ISSYMREF);
1808 }
1809
1810 /*
1811 * Create and return a list of (struct ref) consisting of copies of
1812 * each remote_ref that matches refspec. refspec must be a pattern.
1813 * Fill in the copies' peer_ref to describe the local tracking refs to
1814 * which they map. Omit any references that would map to an existing
1815 * local symbolic ref.
1816 */
1817 static struct ref *get_expanded_map(const struct ref *remote_refs,
1818 const struct refspec *refspec)
1819 {
1820 const struct ref *ref;
1821 struct ref *ret = NULL;
1822 struct ref **tail = &ret;
1823
1824 for (ref = remote_refs; ref; ref = ref->next) {
1825 char *expn_name = NULL;
1826
1827 if (strchr(ref->name, '^'))
1828 continue; /* a dereference item */
1829 if (match_name_with_pattern(refspec->src, ref->name,
1830 refspec->dst, &expn_name) &&
1831 !ignore_symref_update(expn_name)) {
1832 struct ref *cpy = copy_ref(ref);
1833
1834 cpy->peer_ref = alloc_ref(expn_name);
1835 if (refspec->force)
1836 cpy->peer_ref->force = 1;
1837 *tail = cpy;
1838 tail = &cpy->next;
1839 }
1840 free(expn_name);
1841 }
1842
1843 return ret;
1844 }
1845
1846 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1847 {
1848 const struct ref *ref;
1849 for (ref = refs; ref; ref = ref->next) {
1850 if (refname_match(name, ref->name))
1851 return ref;
1852 }
1853 return NULL;
1854 }
1855
1856 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1857 {
1858 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1859
1860 if (!ref)
1861 return NULL;
1862
1863 return copy_ref(ref);
1864 }
1865
1866 static struct ref *get_local_ref(const char *name)
1867 {
1868 if (!name || name[0] == '\0')
1869 return NULL;
1870
1871 if (starts_with(name, "refs/"))
1872 return alloc_ref(name);
1873
1874 if (starts_with(name, "heads/") ||
1875 starts_with(name, "tags/") ||
1876 starts_with(name, "remotes/"))
1877 return alloc_ref_with_prefix("refs/", 5, name);
1878
1879 return alloc_ref_with_prefix("refs/heads/", 11, name);
1880 }
1881
1882 int get_fetch_map(const struct ref *remote_refs,
1883 const struct refspec *refspec,
1884 struct ref ***tail,
1885 int missing_ok)
1886 {
1887 struct ref *ref_map, **rmp;
1888
1889 if (refspec->pattern) {
1890 ref_map = get_expanded_map(remote_refs, refspec);
1891 } else {
1892 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1893
1894 if (refspec->exact_sha1) {
1895 ref_map = alloc_ref(name);
1896 get_oid_hex(name, &ref_map->old_oid);
1897 } else {
1898 ref_map = get_remote_ref(remote_refs, name);
1899 }
1900 if (!missing_ok && !ref_map)
1901 die("Couldn't find remote ref %s", name);
1902 if (ref_map) {
1903 ref_map->peer_ref = get_local_ref(refspec->dst);
1904 if (ref_map->peer_ref && refspec->force)
1905 ref_map->peer_ref->force = 1;
1906 }
1907 }
1908
1909 for (rmp = &ref_map; *rmp; ) {
1910 if ((*rmp)->peer_ref) {
1911 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1912 check_refname_format((*rmp)->peer_ref->name, 0)) {
1913 struct ref *ignore = *rmp;
1914 error("* Ignoring funny ref '%s' locally",
1915 (*rmp)->peer_ref->name);
1916 *rmp = (*rmp)->next;
1917 free(ignore->peer_ref);
1918 free(ignore);
1919 continue;
1920 }
1921 }
1922 rmp = &((*rmp)->next);
1923 }
1924
1925 if (ref_map)
1926 tail_link_ref(ref_map, tail);
1927
1928 return 0;
1929 }
1930
1931 int resolve_remote_symref(struct ref *ref, struct ref *list)
1932 {
1933 if (!ref->symref)
1934 return 0;
1935 for (; list; list = list->next)
1936 if (!strcmp(ref->symref, list->name)) {
1937 oidcpy(&ref->old_oid, &list->old_oid);
1938 return 0;
1939 }
1940 return 1;
1941 }
1942
1943 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1944 {
1945 while (list) {
1946 struct commit *commit = pop_commit(&list);
1947 commit->object.flags &= ~mark;
1948 }
1949 }
1950
1951 int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid)
1952 {
1953 struct object *o;
1954 struct commit *old, *new;
1955 struct commit_list *list, *used;
1956 int found = 0;
1957
1958 /*
1959 * Both new and old must be commit-ish and new is descendant of
1960 * old. Otherwise we require --force.
1961 */
1962 o = deref_tag(parse_object(old_oid->hash), NULL, 0);
1963 if (!o || o->type != OBJ_COMMIT)
1964 return 0;
1965 old = (struct commit *) o;
1966
1967 o = deref_tag(parse_object(new_oid->hash), NULL, 0);
1968 if (!o || o->type != OBJ_COMMIT)
1969 return 0;
1970 new = (struct commit *) o;
1971
1972 if (parse_commit(new) < 0)
1973 return 0;
1974
1975 used = list = NULL;
1976 commit_list_insert(new, &list);
1977 while (list) {
1978 new = pop_most_recent_commit(&list, TMP_MARK);
1979 commit_list_insert(new, &used);
1980 if (new == old) {
1981 found = 1;
1982 break;
1983 }
1984 }
1985 unmark_and_free(list, TMP_MARK);
1986 unmark_and_free(used, TMP_MARK);
1987 return found;
1988 }
1989
1990 /*
1991 * Compare a branch with its upstream, and save their differences (number
1992 * of commits) in *num_ours and *num_theirs. The name of the upstream branch
1993 * (or NULL if no upstream is defined) is returned via *upstream_name, if it
1994 * is not itself NULL.
1995 *
1996 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1997 * upstream defined, or ref does not exist), 0 otherwise.
1998 */
1999 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
2000 const char **upstream_name)
2001 {
2002 struct object_id oid;
2003 struct commit *ours, *theirs;
2004 struct rev_info revs;
2005 const char *base;
2006 struct argv_array argv = ARGV_ARRAY_INIT;
2007
2008 /* Cannot stat unless we are marked to build on top of somebody else. */
2009 base = branch_get_upstream(branch, NULL);
2010 if (upstream_name)
2011 *upstream_name = base;
2012 if (!base)
2013 return -1;
2014
2015 /* Cannot stat if what we used to build on no longer exists */
2016 if (read_ref(base, oid.hash))
2017 return -1;
2018 theirs = lookup_commit_reference(oid.hash);
2019 if (!theirs)
2020 return -1;
2021
2022 if (read_ref(branch->refname, oid.hash))
2023 return -1;
2024 ours = lookup_commit_reference(oid.hash);
2025 if (!ours)
2026 return -1;
2027
2028 /* are we the same? */
2029 if (theirs == ours) {
2030 *num_theirs = *num_ours = 0;
2031 return 0;
2032 }
2033
2034 /* Run "rev-list --left-right ours...theirs" internally... */
2035 argv_array_push(&argv, ""); /* ignored */
2036 argv_array_push(&argv, "--left-right");
2037 argv_array_pushf(&argv, "%s...%s",
2038 oid_to_hex(&ours->object.oid),
2039 oid_to_hex(&theirs->object.oid));
2040 argv_array_push(&argv, "--");
2041
2042 init_revisions(&revs, NULL);
2043 setup_revisions(argv.argc, argv.argv, &revs, NULL);
2044 if (prepare_revision_walk(&revs))
2045 die("revision walk setup failed");
2046
2047 /* ... and count the commits on each side. */
2048 *num_ours = 0;
2049 *num_theirs = 0;
2050 while (1) {
2051 struct commit *c = get_revision(&revs);
2052 if (!c)
2053 break;
2054 if (c->object.flags & SYMMETRIC_LEFT)
2055 (*num_ours)++;
2056 else
2057 (*num_theirs)++;
2058 }
2059
2060 /* clear object flags smudged by the above traversal */
2061 clear_commit_marks(ours, ALL_REV_FLAGS);
2062 clear_commit_marks(theirs, ALL_REV_FLAGS);
2063
2064 argv_array_clear(&argv);
2065 return 0;
2066 }
2067
2068 /*
2069 * Return true when there is anything to report, otherwise false.
2070 */
2071 int format_tracking_info(struct branch *branch, struct strbuf *sb)
2072 {
2073 int ours, theirs;
2074 const char *full_base;
2075 char *base;
2076 int upstream_is_gone = 0;
2077
2078 if (stat_tracking_info(branch, &ours, &theirs, &full_base) < 0) {
2079 if (!full_base)
2080 return 0;
2081 upstream_is_gone = 1;
2082 }
2083
2084 base = shorten_unambiguous_ref(full_base, 0);
2085 if (upstream_is_gone) {
2086 strbuf_addf(sb,
2087 _("Your branch is based on '%s', but the upstream is gone.\n"),
2088 base);
2089 if (advice_status_hints)
2090 strbuf_addf(sb,
2091 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
2092 } else if (!ours && !theirs) {
2093 strbuf_addf(sb,
2094 _("Your branch is up-to-date with '%s'.\n"),
2095 base);
2096 } else if (!theirs) {
2097 strbuf_addf(sb,
2098 Q_("Your branch is ahead of '%s' by %d commit.\n",
2099 "Your branch is ahead of '%s' by %d commits.\n",
2100 ours),
2101 base, ours);
2102 if (advice_status_hints)
2103 strbuf_addf(sb,
2104 _(" (use \"git push\" to publish your local commits)\n"));
2105 } else if (!ours) {
2106 strbuf_addf(sb,
2107 Q_("Your branch is behind '%s' by %d commit, "
2108 "and can be fast-forwarded.\n",
2109 "Your branch is behind '%s' by %d commits, "
2110 "and can be fast-forwarded.\n",
2111 theirs),
2112 base, theirs);
2113 if (advice_status_hints)
2114 strbuf_addf(sb,
2115 _(" (use \"git pull\" to update your local branch)\n"));
2116 } else {
2117 strbuf_addf(sb,
2118 Q_("Your branch and '%s' have diverged,\n"
2119 "and have %d and %d different commit each, "
2120 "respectively.\n",
2121 "Your branch and '%s' have diverged,\n"
2122 "and have %d and %d different commits each, "
2123 "respectively.\n",
2124 theirs),
2125 base, ours, theirs);
2126 if (advice_status_hints)
2127 strbuf_addf(sb,
2128 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2129 }
2130 free(base);
2131 return 1;
2132 }
2133
2134 static int one_local_ref(const char *refname, const struct object_id *oid,
2135 int flag, void *cb_data)
2136 {
2137 struct ref ***local_tail = cb_data;
2138 struct ref *ref;
2139 int len;
2140
2141 /* we already know it starts with refs/ to get here */
2142 if (check_refname_format(refname + 5, 0))
2143 return 0;
2144
2145 len = strlen(refname) + 1;
2146 ref = xcalloc(1, sizeof(*ref) + len);
2147 oidcpy(&ref->new_oid, oid);
2148 memcpy(ref->name, refname, len);
2149 **local_tail = ref;
2150 *local_tail = &ref->next;
2151 return 0;
2152 }
2153
2154 struct ref *get_local_heads(void)
2155 {
2156 struct ref *local_refs = NULL, **local_tail = &local_refs;
2157
2158 for_each_ref(one_local_ref, &local_tail);
2159 return local_refs;
2160 }
2161
2162 struct ref *guess_remote_head(const struct ref *head,
2163 const struct ref *refs,
2164 int all)
2165 {
2166 const struct ref *r;
2167 struct ref *list = NULL;
2168 struct ref **tail = &list;
2169
2170 if (!head)
2171 return NULL;
2172
2173 /*
2174 * Some transports support directly peeking at
2175 * where HEAD points; if that is the case, then
2176 * we don't have to guess.
2177 */
2178 if (head->symref)
2179 return copy_ref(find_ref_by_name(refs, head->symref));
2180
2181 /* If refs/heads/master could be right, it is. */
2182 if (!all) {
2183 r = find_ref_by_name(refs, "refs/heads/master");
2184 if (r && !oidcmp(&r->old_oid, &head->old_oid))
2185 return copy_ref(r);
2186 }
2187
2188 /* Look for another ref that points there */
2189 for (r = refs; r; r = r->next) {
2190 if (r != head &&
2191 starts_with(r->name, "refs/heads/") &&
2192 !oidcmp(&r->old_oid, &head->old_oid)) {
2193 *tail = copy_ref(r);
2194 tail = &((*tail)->next);
2195 if (!all)
2196 break;
2197 }
2198 }
2199
2200 return list;
2201 }
2202
2203 struct stale_heads_info {
2204 struct string_list *ref_names;
2205 struct ref **stale_refs_tail;
2206 struct refspec *refs;
2207 int ref_count;
2208 };
2209
2210 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2211 int flags, void *cb_data)
2212 {
2213 struct stale_heads_info *info = cb_data;
2214 struct string_list matches = STRING_LIST_INIT_DUP;
2215 struct refspec query;
2216 int i, stale = 1;
2217 memset(&query, 0, sizeof(struct refspec));
2218 query.dst = (char *)refname;
2219
2220 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2221 if (matches.nr == 0)
2222 goto clean_exit; /* No matches */
2223
2224 /*
2225 * If we did find a suitable refspec and it's not a symref and
2226 * it's not in the list of refs that currently exist in that
2227 * remote, we consider it to be stale. In order to deal with
2228 * overlapping refspecs, we need to go over all of the
2229 * matching refs.
2230 */
2231 if (flags & REF_ISSYMREF)
2232 goto clean_exit;
2233
2234 for (i = 0; stale && i < matches.nr; i++)
2235 if (string_list_has_string(info->ref_names, matches.items[i].string))
2236 stale = 0;
2237
2238 if (stale) {
2239 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2240 oidcpy(&ref->new_oid, oid);
2241 }
2242
2243 clean_exit:
2244 string_list_clear(&matches, 0);
2245 return 0;
2246 }
2247
2248 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2249 {
2250 struct ref *ref, *stale_refs = NULL;
2251 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2252 struct stale_heads_info info;
2253
2254 info.ref_names = &ref_names;
2255 info.stale_refs_tail = &stale_refs;
2256 info.refs = refs;
2257 info.ref_count = ref_count;
2258 for (ref = fetch_map; ref; ref = ref->next)
2259 string_list_append(&ref_names, ref->name);
2260 string_list_sort(&ref_names);
2261 for_each_ref(get_stale_heads_cb, &info);
2262 string_list_clear(&ref_names, 0);
2263 return stale_refs;
2264 }
2265
2266 /*
2267 * Compare-and-swap
2268 */
2269 static void clear_cas_option(struct push_cas_option *cas)
2270 {
2271 int i;
2272
2273 for (i = 0; i < cas->nr; i++)
2274 free(cas->entry[i].refname);
2275 free(cas->entry);
2276 memset(cas, 0, sizeof(*cas));
2277 }
2278
2279 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2280 const char *refname,
2281 size_t refnamelen)
2282 {
2283 struct push_cas *entry;
2284 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2285 entry = &cas->entry[cas->nr++];
2286 memset(entry, 0, sizeof(*entry));
2287 entry->refname = xmemdupz(refname, refnamelen);
2288 return entry;
2289 }
2290
2291 int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2292 {
2293 const char *colon;
2294 struct push_cas *entry;
2295
2296 if (unset) {
2297 /* "--no-<option>" */
2298 clear_cas_option(cas);
2299 return 0;
2300 }
2301
2302 if (!arg) {
2303 /* just "--<option>" */
2304 cas->use_tracking_for_rest = 1;
2305 return 0;
2306 }
2307
2308 /* "--<option>=refname" or "--<option>=refname:value" */
2309 colon = strchrnul(arg, ':');
2310 entry = add_cas_entry(cas, arg, colon - arg);
2311 if (!*colon)
2312 entry->use_tracking = 1;
2313 else if (get_sha1(colon + 1, entry->expect))
2314 return error("cannot parse expected object name '%s'", colon + 1);
2315 return 0;
2316 }
2317
2318 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2319 {
2320 return parse_push_cas_option(opt->value, arg, unset);
2321 }
2322
2323 int is_empty_cas(const struct push_cas_option *cas)
2324 {
2325 return !cas->use_tracking_for_rest && !cas->nr;
2326 }
2327
2328 /*
2329 * Look at remote.fetch refspec and see if we have a remote
2330 * tracking branch for the refname there. Fill its current
2331 * value in sha1[].
2332 * If we cannot do so, return negative to signal an error.
2333 */
2334 static int remote_tracking(struct remote *remote, const char *refname,
2335 struct object_id *oid)
2336 {
2337 char *dst;
2338
2339 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2340 if (!dst)
2341 return -1; /* no tracking ref for refname at remote */
2342 if (read_ref(dst, oid->hash))
2343 return -1; /* we know what the tracking ref is but we cannot read it */
2344 return 0;
2345 }
2346
2347 static void apply_cas(struct push_cas_option *cas,
2348 struct remote *remote,
2349 struct ref *ref)
2350 {
2351 int i;
2352
2353 /* Find an explicit --<option>=<name>[:<value>] entry */
2354 for (i = 0; i < cas->nr; i++) {
2355 struct push_cas *entry = &cas->entry[i];
2356 if (!refname_match(entry->refname, ref->name))
2357 continue;
2358 ref->expect_old_sha1 = 1;
2359 if (!entry->use_tracking)
2360 hashcpy(ref->old_oid_expect.hash, cas->entry[i].expect);
2361 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2362 ref->expect_old_no_trackback = 1;
2363 return;
2364 }
2365
2366 /* Are we using "--<option>" to cover all? */
2367 if (!cas->use_tracking_for_rest)
2368 return;
2369
2370 ref->expect_old_sha1 = 1;
2371 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2372 ref->expect_old_no_trackback = 1;
2373 }
2374
2375 void apply_push_cas(struct push_cas_option *cas,
2376 struct remote *remote,
2377 struct ref *remote_refs)
2378 {
2379 struct ref *ref;
2380 for (ref = remote_refs; ref; ref = ref->next)
2381 apply_cas(cas, remote, ref);
2382 }
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