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remote: actually check if remote exits
[git.git] / remote.c
blobe4a647cb7bda558854a682e523a50002c345e901
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 int namelen;
322 const char *subkey;
323 struct remote *remote;
324 struct branch *branch;
325 if (parse_config_key(key, "branch", &name, &namelen, &subkey) >= 0) {
326 if (!name)
327 return 0;
328 branch = make_branch(name, namelen);
329 if (!strcmp(subkey, "remote")) {
330 return git_config_string(&branch->remote_name, key, value);
331 } else if (!strcmp(subkey, "pushremote")) {
332 return git_config_string(&branch->pushremote_name, key, value);
333 } else if (!strcmp(subkey, "merge")) {
334 if (!value)
335 return config_error_nonbool(key);
336 add_merge(branch, xstrdup(value));
337 }
338 return 0;
339 }
340 if (parse_config_key(key, "url", &name, &namelen, &subkey) >= 0) {
341 struct rewrite *rewrite;
342 if (!name)
343 return 0;
344 if (!strcmp(subkey, "insteadof")) {
345 rewrite = make_rewrite(&rewrites, name, namelen);
346 if (!value)
347 return config_error_nonbool(key);
348 add_instead_of(rewrite, xstrdup(value));
349 } else if (!strcmp(subkey, "pushinsteadof")) {
350 rewrite = make_rewrite(&rewrites_push, name, namelen);
351 if (!value)
352 return config_error_nonbool(key);
353 add_instead_of(rewrite, xstrdup(value));
354 }
355 }
356
357 if (parse_config_key(key, "remote", &name, &namelen, &subkey) < 0)
358 return 0;
359
360 /* Handle remote.* variables */
361 if (!name && !strcmp(subkey, "pushdefault"))
362 return git_config_string(&pushremote_name, key, value);
363
364 if (!name)
365 return 0;
366 /* Handle remote.<name>.* variables */
367 if (*name == '/') {
368 warning("Config remote shorthand cannot begin with '/': %s",
369 name);
370 return 0;
371 }
372 remote = make_remote(name, namelen);
373 remote->origin = REMOTE_CONFIG;
374 if (!strcmp(subkey, "mirror"))
375 remote->mirror = git_config_bool(key, value);
376 else if (!strcmp(subkey, "skipdefaultupdate"))
377 remote->skip_default_update = git_config_bool(key, value);
378 else if (!strcmp(subkey, "skipfetchall"))
379 remote->skip_default_update = git_config_bool(key, value);
380 else if (!strcmp(subkey, "prune"))
381 remote->prune = git_config_bool(key, value);
382 else if (!strcmp(subkey, "url")) {
383 const char *v;
384 if (git_config_string(&v, key, value))
385 return -1;
386 add_url(remote, v);
387 } else if (!strcmp(subkey, "pushurl")) {
388 const char *v;
389 if (git_config_string(&v, key, value))
390 return -1;
391 add_pushurl(remote, v);
392 } else if (!strcmp(subkey, "push")) {
393 const char *v;
394 if (git_config_string(&v, key, value))
395 return -1;
396 add_push_refspec(remote, v);
397 } else if (!strcmp(subkey, "fetch")) {
398 const char *v;
399 if (git_config_string(&v, key, value))
400 return -1;
401 add_fetch_refspec(remote, v);
402 } else if (!strcmp(subkey, "receivepack")) {
403 const char *v;
404 if (git_config_string(&v, key, value))
405 return -1;
406 if (!remote->receivepack)
407 remote->receivepack = v;
408 else
409 error("more than one receivepack given, using the first");
410 } else if (!strcmp(subkey, "uploadpack")) {
411 const char *v;
412 if (git_config_string(&v, key, value))
413 return -1;
414 if (!remote->uploadpack)
415 remote->uploadpack = v;
416 else
417 error("more than one uploadpack given, using the first");
418 } else if (!strcmp(subkey, "tagopt")) {
419 if (!strcmp(value, "--no-tags"))
420 remote->fetch_tags = -1;
421 else if (!strcmp(value, "--tags"))
422 remote->fetch_tags = 2;
423 } else if (!strcmp(subkey, "proxy")) {
424 return git_config_string((const char **)&remote->http_proxy,
425 key, value);
426 } else if (!strcmp(subkey, "proxyauthmethod")) {
427 return git_config_string((const char **)&remote->http_proxy_authmethod,
428 key, value);
429 } else if (!strcmp(subkey, "vcs")) {
430 return git_config_string(&remote->foreign_vcs, key, value);
431 }
432 return 0;
433 }
434
435 static void alias_all_urls(void)
436 {
437 int i, j;
438 for (i = 0; i < remotes_nr; i++) {
439 int add_pushurl_aliases;
440 if (!remotes[i])
441 continue;
442 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
443 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
444 }
445 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
446 for (j = 0; j < remotes[i]->url_nr; j++) {
447 if (add_pushurl_aliases)
448 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
449 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
450 }
451 }
452 }
453
454 static void read_config(void)
455 {
456 static int loaded;
457 struct object_id oid;
458 const char *head_ref;
459 int flag;
460
461 if (loaded)
462 return;
463 loaded = 1;
464
465 current_branch = NULL;
466 head_ref = resolve_ref_unsafe("HEAD", 0, oid.hash, &flag);
467 if (head_ref && (flag & REF_ISSYMREF) &&
468 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
469 current_branch = make_branch(head_ref, 0);
470 }
471 git_config(handle_config, NULL);
472 alias_all_urls();
473 }
474
475 /*
476 * This function frees a refspec array.
477 * Warning: code paths should be checked to ensure that the src
478 * and dst pointers are always freeable pointers as well
479 * as the refspec pointer itself.
480 */
481 static void free_refspecs(struct refspec *refspec, int nr_refspec)
482 {
483 int i;
484
485 if (!refspec)
486 return;
487
488 for (i = 0; i < nr_refspec; i++) {
489 free(refspec[i].src);
490 free(refspec[i].dst);
491 }
492 free(refspec);
493 }
494
495 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
496 {
497 int i;
498 struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
499
500 for (i = 0; i < nr_refspec; i++) {
501 size_t llen;
502 int is_glob;
503 const char *lhs, *rhs;
504 int flags;
505
506 is_glob = 0;
507
508 lhs = refspec[i];
509 if (*lhs == '+') {
510 rs[i].force = 1;
511 lhs++;
512 }
513
514 rhs = strrchr(lhs, ':');
515
516 /*
517 * Before going on, special case ":" (or "+:") as a refspec
518 * for pushing matching refs.
519 */
520 if (!fetch && rhs == lhs && rhs[1] == '\0') {
521 rs[i].matching = 1;
522 continue;
523 }
524
525 if (rhs) {
526 size_t rlen = strlen(++rhs);
527 is_glob = (1 <= rlen && strchr(rhs, '*'));
528 rs[i].dst = xstrndup(rhs, rlen);
529 }
530
531 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
532 if (1 <= llen && memchr(lhs, '*', llen)) {
533 if ((rhs && !is_glob) || (!rhs && fetch))
534 goto invalid;
535 is_glob = 1;
536 } else if (rhs && is_glob) {
537 goto invalid;
538 }
539
540 rs[i].pattern = is_glob;
541 rs[i].src = xstrndup(lhs, llen);
542 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
543
544 if (fetch) {
545 struct object_id unused;
546
547 /* LHS */
548 if (!*rs[i].src)
549 ; /* empty is ok; it means "HEAD" */
550 else if (llen == GIT_SHA1_HEXSZ && !get_oid_hex(rs[i].src, &unused))
551 rs[i].exact_sha1 = 1; /* ok */
552 else if (!check_refname_format(rs[i].src, flags))
553 ; /* valid looking ref is ok */
554 else
555 goto invalid;
556 /* RHS */
557 if (!rs[i].dst)
558 ; /* missing is ok; it is the same as empty */
559 else if (!*rs[i].dst)
560 ; /* empty is ok; it means "do not store" */
561 else if (!check_refname_format(rs[i].dst, flags))
562 ; /* valid looking ref is ok */
563 else
564 goto invalid;
565 } else {
566 /*
567 * LHS
568 * - empty is allowed; it means delete.
569 * - when wildcarded, it must be a valid looking ref.
570 * - otherwise, it must be an extended SHA-1, but
571 * there is no existing way to validate this.
572 */
573 if (!*rs[i].src)
574 ; /* empty is ok */
575 else if (is_glob) {
576 if (check_refname_format(rs[i].src, flags))
577 goto invalid;
578 }
579 else
580 ; /* anything goes, for now */
581 /*
582 * RHS
583 * - missing is allowed, but LHS then must be a
584 * valid looking ref.
585 * - empty is not allowed.
586 * - otherwise it must be a valid looking ref.
587 */
588 if (!rs[i].dst) {
589 if (check_refname_format(rs[i].src, flags))
590 goto invalid;
591 } else if (!*rs[i].dst) {
592 goto invalid;
593 } else {
594 if (check_refname_format(rs[i].dst, flags))
595 goto invalid;
596 }
597 }
598 }
599 return rs;
600
601 invalid:
602 if (verify) {
603 /*
604 * nr_refspec must be greater than zero and i must be valid
605 * since it is only possible to reach this point from within
606 * the for loop above.
607 */
608 free_refspecs(rs, i+1);
609 return NULL;
610 }
611 die("Invalid refspec '%s'", refspec[i]);
612 }
613
614 int valid_fetch_refspec(const char *fetch_refspec_str)
615 {
616 struct refspec *refspec;
617
618 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
619 free_refspecs(refspec, 1);
620 return !!refspec;
621 }
622
623 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
624 {
625 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
626 }
627
628 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
629 {
630 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
631 }
632
633 void free_refspec(int nr_refspec, struct refspec *refspec)
634 {
635 int i;
636 for (i = 0; i < nr_refspec; i++) {
637 free(refspec[i].src);
638 free(refspec[i].dst);
639 }
640 free(refspec);
641 }
642
643 static int valid_remote_nick(const char *name)
644 {
645 if (!name[0] || is_dot_or_dotdot(name))
646 return 0;
647 return !strchr(name, '/'); /* no slash */
648 }
649
650 const char *remote_for_branch(struct branch *branch, int *explicit)
651 {
652 if (branch && branch->remote_name) {
653 if (explicit)
654 *explicit = 1;
655 return branch->remote_name;
656 }
657 if (explicit)
658 *explicit = 0;
659 return "origin";
660 }
661
662 const char *pushremote_for_branch(struct branch *branch, int *explicit)
663 {
664 if (branch && branch->pushremote_name) {
665 if (explicit)
666 *explicit = 1;
667 return branch->pushremote_name;
668 }
669 if (pushremote_name) {
670 if (explicit)
671 *explicit = 1;
672 return pushremote_name;
673 }
674 return remote_for_branch(branch, explicit);
675 }
676
677 static struct remote *remote_get_1(const char *name,
678 const char *(*get_default)(struct branch *, int *))
679 {
680 struct remote *ret;
681 int name_given = 0;
682
683 read_config();
684
685 if (name)
686 name_given = 1;
687 else
688 name = get_default(current_branch, &name_given);
689
690 ret = make_remote(name, 0);
691 if (valid_remote_nick(name)) {
692 if (!valid_remote(ret))
693 read_remotes_file(ret);
694 if (!valid_remote(ret))
695 read_branches_file(ret);
696 }
697 if (name_given && !valid_remote(ret))
698 add_url_alias(ret, name);
699 if (!valid_remote(ret))
700 return NULL;
701 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
702 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
703 return ret;
704 }
705
706 struct remote *remote_get(const char *name)
707 {
708 return remote_get_1(name, remote_for_branch);
709 }
710
711 struct remote *pushremote_get(const char *name)
712 {
713 return remote_get_1(name, pushremote_for_branch);
714 }
715
716 int remote_is_configured(struct remote *remote)
717 {
718 return remote && remote->origin;
719 }
720
721 int for_each_remote(each_remote_fn fn, void *priv)
722 {
723 int i, result = 0;
724 read_config();
725 for (i = 0; i < remotes_nr && !result; i++) {
726 struct remote *r = remotes[i];
727 if (!r)
728 continue;
729 if (!r->fetch)
730 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
731 r->fetch_refspec);
732 if (!r->push)
733 r->push = parse_push_refspec(r->push_refspec_nr,
734 r->push_refspec);
735 result = fn(r, priv);
736 }
737 return result;
738 }
739
740 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
741 {
742 if (strcmp(ref1->name, ref2->name)) {
743 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
744 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
745 die(_("Cannot fetch both %s and %s to %s"),
746 ref1->name, ref2->name, ref2->peer_ref->name);
747 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
748 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
749 warning(_("%s usually tracks %s, not %s"),
750 ref2->peer_ref->name, ref2->name, ref1->name);
751 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
752 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
753 die(_("%s tracks both %s and %s"),
754 ref2->peer_ref->name, ref1->name, ref2->name);
755 } else {
756 /*
757 * This last possibility doesn't occur because
758 * FETCH_HEAD_IGNORE entries always appear at
759 * the end of the list.
760 */
761 die(_("Internal error"));
762 }
763 }
764 free(ref2->peer_ref);
765 free(ref2);
766 }
767
768 struct ref *ref_remove_duplicates(struct ref *ref_map)
769 {
770 struct string_list refs = STRING_LIST_INIT_NODUP;
771 struct ref *retval = NULL;
772 struct ref **p = &retval;
773
774 while (ref_map) {
775 struct ref *ref = ref_map;
776
777 ref_map = ref_map->next;
778 ref->next = NULL;
779
780 if (!ref->peer_ref) {
781 *p = ref;
782 p = &ref->next;
783 } else {
784 struct string_list_item *item =
785 string_list_insert(&refs, ref->peer_ref->name);
786
787 if (item->util) {
788 /* Entry already existed */
789 handle_duplicate((struct ref *)item->util, ref);
790 } else {
791 *p = ref;
792 p = &ref->next;
793 item->util = ref;
794 }
795 }
796 }
797
798 string_list_clear(&refs, 0);
799 return retval;
800 }
801
802 int remote_has_url(struct remote *remote, const char *url)
803 {
804 int i;
805 for (i = 0; i < remote->url_nr; i++) {
806 if (!strcmp(remote->url[i], url))
807 return 1;
808 }
809 return 0;
810 }
811
812 static int match_name_with_pattern(const char *key, const char *name,
813 const char *value, char **result)
814 {
815 const char *kstar = strchr(key, '*');
816 size_t klen;
817 size_t ksuffixlen;
818 size_t namelen;
819 int ret;
820 if (!kstar)
821 die("Key '%s' of pattern had no '*'", key);
822 klen = kstar - key;
823 ksuffixlen = strlen(kstar + 1);
824 namelen = strlen(name);
825 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
826 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
827 if (ret && value) {
828 struct strbuf sb = STRBUF_INIT;
829 const char *vstar = strchr(value, '*');
830 if (!vstar)
831 die("Value '%s' of pattern has no '*'", value);
832 strbuf_add(&sb, value, vstar - value);
833 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
834 strbuf_addstr(&sb, vstar + 1);
835 *result = strbuf_detach(&sb, NULL);
836 }
837 return ret;
838 }
839
840 static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
841 {
842 int i;
843 int find_src = !query->src;
844
845 if (find_src && !query->dst)
846 error("query_refspecs_multiple: need either src or dst");
847
848 for (i = 0; i < ref_count; i++) {
849 struct refspec *refspec = &refs[i];
850 const char *key = find_src ? refspec->dst : refspec->src;
851 const char *value = find_src ? refspec->src : refspec->dst;
852 const char *needle = find_src ? query->dst : query->src;
853 char **result = find_src ? &query->src : &query->dst;
854
855 if (!refspec->dst)
856 continue;
857 if (refspec->pattern) {
858 if (match_name_with_pattern(key, needle, value, result))
859 string_list_append_nodup(results, *result);
860 } else if (!strcmp(needle, key)) {
861 string_list_append(results, value);
862 }
863 }
864 }
865
866 int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
867 {
868 int i;
869 int find_src = !query->src;
870 const char *needle = find_src ? query->dst : query->src;
871 char **result = find_src ? &query->src : &query->dst;
872
873 if (find_src && !query->dst)
874 return error("query_refspecs: need either src or dst");
875
876 for (i = 0; i < ref_count; i++) {
877 struct refspec *refspec = &refs[i];
878 const char *key = find_src ? refspec->dst : refspec->src;
879 const char *value = find_src ? refspec->src : refspec->dst;
880
881 if (!refspec->dst)
882 continue;
883 if (refspec->pattern) {
884 if (match_name_with_pattern(key, needle, value, result)) {
885 query->force = refspec->force;
886 return 0;
887 }
888 } else if (!strcmp(needle, key)) {
889 *result = xstrdup(value);
890 query->force = refspec->force;
891 return 0;
892 }
893 }
894 return -1;
895 }
896
897 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
898 const char *name)
899 {
900 struct refspec query;
901
902 memset(&query, 0, sizeof(struct refspec));
903 query.src = (char *)name;
904
905 if (query_refspecs(refspecs, nr_refspec, &query))
906 return NULL;
907
908 return query.dst;
909 }
910
911 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
912 {
913 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
914 }
915
916 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
917 const char *name)
918 {
919 size_t len = strlen(name);
920 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
921 memcpy(ref->name, prefix, prefixlen);
922 memcpy(ref->name + prefixlen, name, len);
923 return ref;
924 }
925
926 struct ref *alloc_ref(const char *name)
927 {
928 return alloc_ref_with_prefix("", 0, name);
929 }
930
931 struct ref *copy_ref(const struct ref *ref)
932 {
933 struct ref *cpy;
934 size_t len;
935 if (!ref)
936 return NULL;
937 len = strlen(ref->name);
938 cpy = xmalloc(sizeof(struct ref) + len + 1);
939 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
940 cpy->next = NULL;
941 cpy->symref = xstrdup_or_null(ref->symref);
942 cpy->remote_status = xstrdup_or_null(ref->remote_status);
943 cpy->peer_ref = copy_ref(ref->peer_ref);
944 return cpy;
945 }
946
947 struct ref *copy_ref_list(const struct ref *ref)
948 {
949 struct ref *ret = NULL;
950 struct ref **tail = &ret;
951 while (ref) {
952 *tail = copy_ref(ref);
953 ref = ref->next;
954 tail = &((*tail)->next);
955 }
956 return ret;
957 }
958
959 static void free_ref(struct ref *ref)
960 {
961 if (!ref)
962 return;
963 free_ref(ref->peer_ref);
964 free(ref->remote_status);
965 free(ref->symref);
966 free(ref);
967 }
968
969 void free_refs(struct ref *ref)
970 {
971 struct ref *next;
972 while (ref) {
973 next = ref->next;
974 free_ref(ref);
975 ref = next;
976 }
977 }
978
979 int ref_compare_name(const void *va, const void *vb)
980 {
981 const struct ref *a = va, *b = vb;
982 return strcmp(a->name, b->name);
983 }
984
985 static void *ref_list_get_next(const void *a)
986 {
987 return ((const struct ref *)a)->next;
988 }
989
990 static void ref_list_set_next(void *a, void *next)
991 {
992 ((struct ref *)a)->next = next;
993 }
994
995 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
996 {
997 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
998 }
999
1000 int count_refspec_match(const char *pattern,
1001 struct ref *refs,
1002 struct ref **matched_ref)
1003 {
1004 int patlen = strlen(pattern);
1005 struct ref *matched_weak = NULL;
1006 struct ref *matched = NULL;
1007 int weak_match = 0;
1008 int match = 0;
1009
1010 for (weak_match = match = 0; refs; refs = refs->next) {
1011 char *name = refs->name;
1012 int namelen = strlen(name);
1013
1014 if (!refname_match(pattern, name))
1015 continue;
1016
1017 /* A match is "weak" if it is with refs outside
1018 * heads or tags, and did not specify the pattern
1019 * in full (e.g. "refs/remotes/origin/master") or at
1020 * least from the toplevel (e.g. "remotes/origin/master");
1021 * otherwise "git push $URL master" would result in
1022 * ambiguity between remotes/origin/master and heads/master
1023 * at the remote site.
1024 */
1025 if (namelen != patlen &&
1026 patlen != namelen - 5 &&
1027 !starts_with(name, "refs/heads/") &&
1028 !starts_with(name, "refs/tags/")) {
1029 /* We want to catch the case where only weak
1030 * matches are found and there are multiple
1031 * matches, and where more than one strong
1032 * matches are found, as ambiguous. One
1033 * strong match with zero or more weak matches
1034 * are acceptable as a unique match.
1035 */
1036 matched_weak = refs;
1037 weak_match++;
1038 }
1039 else {
1040 matched = refs;
1041 match++;
1042 }
1043 }
1044 if (!matched) {
1045 if (matched_ref)
1046 *matched_ref = matched_weak;
1047 return weak_match;
1048 }
1049 else {
1050 if (matched_ref)
1051 *matched_ref = matched;
1052 return match;
1053 }
1054 }
1055
1056 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1057 {
1058 **tail = ref;
1059 while (ref->next)
1060 ref = ref->next;
1061 *tail = &ref->next;
1062 }
1063
1064 static struct ref *alloc_delete_ref(void)
1065 {
1066 struct ref *ref = alloc_ref("(delete)");
1067 oidclr(&ref->new_oid);
1068 return ref;
1069 }
1070
1071 static int try_explicit_object_name(const char *name,
1072 struct ref **match)
1073 {
1074 struct object_id oid;
1075
1076 if (!*name) {
1077 if (match)
1078 *match = alloc_delete_ref();
1079 return 0;
1080 }
1081
1082 if (get_sha1(name, oid.hash))
1083 return -1;
1084
1085 if (match) {
1086 *match = alloc_ref(name);
1087 oidcpy(&(*match)->new_oid, &oid);
1088 }
1089 return 0;
1090 }
1091
1092 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1093 {
1094 struct ref *ret = alloc_ref(name);
1095 tail_link_ref(ret, tail);
1096 return ret;
1097 }
1098
1099 static char *guess_ref(const char *name, struct ref *peer)
1100 {
1101 struct strbuf buf = STRBUF_INIT;
1102 struct object_id oid;
1103
1104 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1105 oid.hash, NULL);
1106 if (!r)
1107 return NULL;
1108
1109 if (starts_with(r, "refs/heads/"))
1110 strbuf_addstr(&buf, "refs/heads/");
1111 else if (starts_with(r, "refs/tags/"))
1112 strbuf_addstr(&buf, "refs/tags/");
1113 else
1114 return NULL;
1115
1116 strbuf_addstr(&buf, name);
1117 return strbuf_detach(&buf, NULL);
1118 }
1119
1120 static int match_explicit_lhs(struct ref *src,
1121 struct refspec *rs,
1122 struct ref **match,
1123 int *allocated_match)
1124 {
1125 switch (count_refspec_match(rs->src, src, match)) {
1126 case 1:
1127 if (allocated_match)
1128 *allocated_match = 0;
1129 return 0;
1130 case 0:
1131 /* The source could be in the get_sha1() format
1132 * not a reference name. :refs/other is a
1133 * way to delete 'other' ref at the remote end.
1134 */
1135 if (try_explicit_object_name(rs->src, match) < 0)
1136 return error("src refspec %s does not match any.", rs->src);
1137 if (allocated_match)
1138 *allocated_match = 1;
1139 return 0;
1140 default:
1141 return error("src refspec %s matches more than one.", rs->src);
1142 }
1143 }
1144
1145 static int match_explicit(struct ref *src, struct ref *dst,
1146 struct ref ***dst_tail,
1147 struct refspec *rs)
1148 {
1149 struct ref *matched_src, *matched_dst;
1150 int allocated_src;
1151
1152 const char *dst_value = rs->dst;
1153 char *dst_guess;
1154
1155 if (rs->pattern || rs->matching)
1156 return 0;
1157
1158 matched_src = matched_dst = NULL;
1159 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1160 return -1;
1161
1162 if (!dst_value) {
1163 struct object_id oid;
1164 int flag;
1165
1166 dst_value = resolve_ref_unsafe(matched_src->name,
1167 RESOLVE_REF_READING,
1168 oid.hash, &flag);
1169 if (!dst_value ||
1170 ((flag & REF_ISSYMREF) &&
1171 !starts_with(dst_value, "refs/heads/")))
1172 die("%s cannot be resolved to branch.",
1173 matched_src->name);
1174 }
1175
1176 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1177 case 1:
1178 break;
1179 case 0:
1180 if (starts_with(dst_value, "refs/"))
1181 matched_dst = make_linked_ref(dst_value, dst_tail);
1182 else if (is_null_oid(&matched_src->new_oid))
1183 error("unable to delete '%s': remote ref does not exist",
1184 dst_value);
1185 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1186 matched_dst = make_linked_ref(dst_guess, dst_tail);
1187 else
1188 error("unable to push to unqualified destination: %s\n"
1189 "The destination refspec neither matches an "
1190 "existing ref on the remote nor\n"
1191 "begins with refs/, and we are unable to "
1192 "guess a prefix based on the source ref.",
1193 dst_value);
1194 break;
1195 default:
1196 matched_dst = NULL;
1197 error("dst refspec %s matches more than one.",
1198 dst_value);
1199 break;
1200 }
1201 if (!matched_dst)
1202 return -1;
1203 if (matched_dst->peer_ref)
1204 return error("dst ref %s receives from more than one src.",
1205 matched_dst->name);
1206 else {
1207 matched_dst->peer_ref = allocated_src ?
1208 matched_src :
1209 copy_ref(matched_src);
1210 matched_dst->force = rs->force;
1211 }
1212 return 0;
1213 }
1214
1215 static int match_explicit_refs(struct ref *src, struct ref *dst,
1216 struct ref ***dst_tail, struct refspec *rs,
1217 int rs_nr)
1218 {
1219 int i, errs;
1220 for (i = errs = 0; i < rs_nr; i++)
1221 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1222 return errs;
1223 }
1224
1225 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1226 int send_mirror, int direction, const struct refspec **ret_pat)
1227 {
1228 const struct refspec *pat;
1229 char *name;
1230 int i;
1231 int matching_refs = -1;
1232 for (i = 0; i < rs_nr; i++) {
1233 if (rs[i].matching &&
1234 (matching_refs == -1 || rs[i].force)) {
1235 matching_refs = i;
1236 continue;
1237 }
1238
1239 if (rs[i].pattern) {
1240 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1241 int match;
1242 if (direction == FROM_SRC)
1243 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1244 else
1245 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1246 if (match) {
1247 matching_refs = i;
1248 break;
1249 }
1250 }
1251 }
1252 if (matching_refs == -1)
1253 return NULL;
1254
1255 pat = rs + matching_refs;
1256 if (pat->matching) {
1257 /*
1258 * "matching refs"; traditionally we pushed everything
1259 * including refs outside refs/heads/ hierarchy, but
1260 * that does not make much sense these days.
1261 */
1262 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1263 return NULL;
1264 name = xstrdup(ref->name);
1265 }
1266 if (ret_pat)
1267 *ret_pat = pat;
1268 return name;
1269 }
1270
1271 static struct ref **tail_ref(struct ref **head)
1272 {
1273 struct ref **tail = head;
1274 while (*tail)
1275 tail = &((*tail)->next);
1276 return tail;
1277 }
1278
1279 struct tips {
1280 struct commit **tip;
1281 int nr, alloc;
1282 };
1283
1284 static void add_to_tips(struct tips *tips, const struct object_id *oid)
1285 {
1286 struct commit *commit;
1287
1288 if (is_null_oid(oid))
1289 return;
1290 commit = lookup_commit_reference_gently(oid->hash, 1);
1291 if (!commit || (commit->object.flags & TMP_MARK))
1292 return;
1293 commit->object.flags |= TMP_MARK;
1294 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1295 tips->tip[tips->nr++] = commit;
1296 }
1297
1298 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1299 {
1300 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1301 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1302 struct string_list_item *item;
1303 struct ref *ref;
1304 struct tips sent_tips;
1305
1306 /*
1307 * Collect everything we know they would have at the end of
1308 * this push, and collect all tags they have.
1309 */
1310 memset(&sent_tips, 0, sizeof(sent_tips));
1311 for (ref = *dst; ref; ref = ref->next) {
1312 if (ref->peer_ref &&
1313 !is_null_oid(&ref->peer_ref->new_oid))
1314 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1315 else
1316 add_to_tips(&sent_tips, &ref->old_oid);
1317 if (starts_with(ref->name, "refs/tags/"))
1318 string_list_append(&dst_tag, ref->name);
1319 }
1320 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1321
1322 string_list_sort(&dst_tag);
1323
1324 /* Collect tags they do not have. */
1325 for (ref = src; ref; ref = ref->next) {
1326 if (!starts_with(ref->name, "refs/tags/"))
1327 continue; /* not a tag */
1328 if (string_list_has_string(&dst_tag, ref->name))
1329 continue; /* they already have it */
1330 if (sha1_object_info(ref->new_oid.hash, NULL) != OBJ_TAG)
1331 continue; /* be conservative */
1332 item = string_list_append(&src_tag, ref->name);
1333 item->util = ref;
1334 }
1335 string_list_clear(&dst_tag, 0);
1336
1337 /*
1338 * At this point, src_tag lists tags that are missing from
1339 * dst, and sent_tips lists the tips we are pushing or those
1340 * that we know they already have. An element in the src_tag
1341 * that is an ancestor of any of the sent_tips needs to be
1342 * sent to the other side.
1343 */
1344 if (sent_tips.nr) {
1345 for_each_string_list_item(item, &src_tag) {
1346 struct ref *ref = item->util;
1347 struct ref *dst_ref;
1348 struct commit *commit;
1349
1350 if (is_null_oid(&ref->new_oid))
1351 continue;
1352 commit = lookup_commit_reference_gently(ref->new_oid.hash, 1);
1353 if (!commit)
1354 /* not pushing a commit, which is not an error */
1355 continue;
1356
1357 /*
1358 * Is this tag, which they do not have, reachable from
1359 * any of the commits we are sending?
1360 */
1361 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1362 continue;
1363
1364 /* Add it in */
1365 dst_ref = make_linked_ref(ref->name, dst_tail);
1366 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1367 dst_ref->peer_ref = copy_ref(ref);
1368 }
1369 }
1370 string_list_clear(&src_tag, 0);
1371 free(sent_tips.tip);
1372 }
1373
1374 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1375 {
1376 for ( ; list; list = list->next)
1377 if (!strcmp(list->name, name))
1378 return (struct ref *)list;
1379 return NULL;
1380 }
1381
1382 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1383 {
1384 for ( ; ref; ref = ref->next)
1385 string_list_append_nodup(ref_index, ref->name)->util = ref;
1386
1387 string_list_sort(ref_index);
1388 }
1389
1390 /*
1391 * Given only the set of local refs, sanity-check the set of push
1392 * refspecs. We can't catch all errors that match_push_refs would,
1393 * but we can catch some errors early before even talking to the
1394 * remote side.
1395 */
1396 int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1397 {
1398 struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1399 int ret = 0;
1400 int i;
1401
1402 for (i = 0; i < nr_refspec; i++) {
1403 struct refspec *rs = refspec + i;
1404
1405 if (rs->pattern || rs->matching)
1406 continue;
1407
1408 ret |= match_explicit_lhs(src, rs, NULL, NULL);
1409 }
1410
1411 free_refspec(nr_refspec, refspec);
1412 return ret;
1413 }
1414
1415 /*
1416 * Given the set of refs the local repository has, the set of refs the
1417 * remote repository has, and the refspec used for push, determine
1418 * what remote refs we will update and with what value by setting
1419 * peer_ref (which object is being pushed) and force (if the push is
1420 * forced) in elements of "dst". The function may add new elements to
1421 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1422 */
1423 int match_push_refs(struct ref *src, struct ref **dst,
1424 int nr_refspec, const char **refspec, int flags)
1425 {
1426 struct refspec *rs;
1427 int send_all = flags & MATCH_REFS_ALL;
1428 int send_mirror = flags & MATCH_REFS_MIRROR;
1429 int send_prune = flags & MATCH_REFS_PRUNE;
1430 int errs;
1431 static const char *default_refspec[] = { ":", NULL };
1432 struct ref *ref, **dst_tail = tail_ref(dst);
1433 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1434
1435 if (!nr_refspec) {
1436 nr_refspec = 1;
1437 refspec = default_refspec;
1438 }
1439 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1440 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1441
1442 /* pick the remainder */
1443 for (ref = src; ref; ref = ref->next) {
1444 struct string_list_item *dst_item;
1445 struct ref *dst_peer;
1446 const struct refspec *pat = NULL;
1447 char *dst_name;
1448
1449 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1450 if (!dst_name)
1451 continue;
1452
1453 if (!dst_ref_index.nr)
1454 prepare_ref_index(&dst_ref_index, *dst);
1455
1456 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1457 dst_peer = dst_item ? dst_item->util : NULL;
1458 if (dst_peer) {
1459 if (dst_peer->peer_ref)
1460 /* We're already sending something to this ref. */
1461 goto free_name;
1462 } else {
1463 if (pat->matching && !(send_all || send_mirror))
1464 /*
1465 * Remote doesn't have it, and we have no
1466 * explicit pattern, and we don't have
1467 * --all or --mirror.
1468 */
1469 goto free_name;
1470
1471 /* Create a new one and link it */
1472 dst_peer = make_linked_ref(dst_name, &dst_tail);
1473 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1474 string_list_insert(&dst_ref_index,
1475 dst_peer->name)->util = dst_peer;
1476 }
1477 dst_peer->peer_ref = copy_ref(ref);
1478 dst_peer->force = pat->force;
1479 free_name:
1480 free(dst_name);
1481 }
1482
1483 string_list_clear(&dst_ref_index, 0);
1484
1485 if (flags & MATCH_REFS_FOLLOW_TAGS)
1486 add_missing_tags(src, dst, &dst_tail);
1487
1488 if (send_prune) {
1489 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1490 /* check for missing refs on the remote */
1491 for (ref = *dst; ref; ref = ref->next) {
1492 char *src_name;
1493
1494 if (ref->peer_ref)
1495 /* We're already sending something to this ref. */
1496 continue;
1497
1498 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1499 if (src_name) {
1500 if (!src_ref_index.nr)
1501 prepare_ref_index(&src_ref_index, src);
1502 if (!string_list_has_string(&src_ref_index,
1503 src_name))
1504 ref->peer_ref = alloc_delete_ref();
1505 free(src_name);
1506 }
1507 }
1508 string_list_clear(&src_ref_index, 0);
1509 }
1510 if (errs)
1511 return -1;
1512 return 0;
1513 }
1514
1515 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1516 int force_update)
1517 {
1518 struct ref *ref;
1519
1520 for (ref = remote_refs; ref; ref = ref->next) {
1521 int force_ref_update = ref->force || force_update;
1522 int reject_reason = 0;
1523
1524 if (ref->peer_ref)
1525 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1526 else if (!send_mirror)
1527 continue;
1528
1529 ref->deletion = is_null_oid(&ref->new_oid);
1530 if (!ref->deletion &&
1531 !oidcmp(&ref->old_oid, &ref->new_oid)) {
1532 ref->status = REF_STATUS_UPTODATE;
1533 continue;
1534 }
1535
1536 /*
1537 * Bypass the usual "must fast-forward" check but
1538 * replace it with a weaker "the old value must be
1539 * this value we observed". If the remote ref has
1540 * moved and is now different from what we expect,
1541 * reject any push.
1542 *
1543 * It also is an error if the user told us to check
1544 * with the remote-tracking branch to find the value
1545 * to expect, but we did not have such a tracking
1546 * branch.
1547 */
1548 if (ref->expect_old_sha1) {
1549 if (ref->expect_old_no_trackback ||
1550 oidcmp(&ref->old_oid, &ref->old_oid_expect))
1551 reject_reason = REF_STATUS_REJECT_STALE;
1552 }
1553
1554 /*
1555 * The usual "must fast-forward" rules.
1556 *
1557 * Decide whether an individual refspec A:B can be
1558 * pushed. The push will succeed if any of the
1559 * following are true:
1560 *
1561 * (1) the remote reference B does not exist
1562 *
1563 * (2) the remote reference B is being removed (i.e.,
1564 * pushing :B where no source is specified)
1565 *
1566 * (3) the destination is not under refs/tags/, and
1567 * if the old and new value is a commit, the new
1568 * is a descendant of the old.
1569 *
1570 * (4) it is forced using the +A:B notation, or by
1571 * passing the --force argument
1572 */
1573
1574 else if (!ref->deletion && !is_null_oid(&ref->old_oid)) {
1575 if (starts_with(ref->name, "refs/tags/"))
1576 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1577 else if (!has_object_file(&ref->old_oid))
1578 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1579 else if (!lookup_commit_reference_gently(ref->old_oid.hash, 1) ||
1580 !lookup_commit_reference_gently(ref->new_oid.hash, 1))
1581 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1582 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1583 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1584 }
1585
1586 /*
1587 * "--force" will defeat any rejection implemented
1588 * by the rules above.
1589 */
1590 if (!force_ref_update)
1591 ref->status = reject_reason;
1592 else if (reject_reason)
1593 ref->forced_update = 1;
1594 }
1595 }
1596
1597 static void set_merge(struct branch *ret)
1598 {
1599 struct remote *remote;
1600 char *ref;
1601 struct object_id oid;
1602 int i;
1603
1604 if (!ret)
1605 return; /* no branch */
1606 if (ret->merge)
1607 return; /* already run */
1608 if (!ret->remote_name || !ret->merge_nr) {
1609 /*
1610 * no merge config; let's make sure we don't confuse callers
1611 * with a non-zero merge_nr but a NULL merge
1612 */
1613 ret->merge_nr = 0;
1614 return;
1615 }
1616
1617 remote = remote_get(ret->remote_name);
1618
1619 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1620 for (i = 0; i < ret->merge_nr; i++) {
1621 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1622 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1623 if (!remote_find_tracking(remote, ret->merge[i]) ||
1624 strcmp(ret->remote_name, "."))
1625 continue;
1626 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1627 oid.hash, &ref) == 1)
1628 ret->merge[i]->dst = ref;
1629 else
1630 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1631 }
1632 }
1633
1634 struct branch *branch_get(const char *name)
1635 {
1636 struct branch *ret;
1637
1638 read_config();
1639 if (!name || !*name || !strcmp(name, "HEAD"))
1640 ret = current_branch;
1641 else
1642 ret = make_branch(name, 0);
1643 set_merge(ret);
1644 return ret;
1645 }
1646
1647 int branch_has_merge_config(struct branch *branch)
1648 {
1649 return branch && !!branch->merge;
1650 }
1651
1652 int branch_merge_matches(struct branch *branch,
1653 int i,
1654 const char *refname)
1655 {
1656 if (!branch || i < 0 || i >= branch->merge_nr)
1657 return 0;
1658 return refname_match(branch->merge[i]->src, refname);
1659 }
1660
1661 __attribute((format (printf,2,3)))
1662 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1663 {
1664 if (err) {
1665 va_list ap;
1666 va_start(ap, fmt);
1667 strbuf_vaddf(err, fmt, ap);
1668 va_end(ap);
1669 }
1670 return NULL;
1671 }
1672
1673 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1674 {
1675 if (!branch)
1676 return error_buf(err, _("HEAD does not point to a branch"));
1677
1678 if (!branch->merge || !branch->merge[0]) {
1679 /*
1680 * no merge config; is it because the user didn't define any,
1681 * or because it is not a real branch, and get_branch
1682 * auto-vivified it?
1683 */
1684 if (!ref_exists(branch->refname))
1685 return error_buf(err, _("no such branch: '%s'"),
1686 branch->name);
1687 return error_buf(err,
1688 _("no upstream configured for branch '%s'"),
1689 branch->name);
1690 }
1691
1692 if (!branch->merge[0]->dst)
1693 return error_buf(err,
1694 _("upstream branch '%s' not stored as a remote-tracking branch"),
1695 branch->merge[0]->src);
1696
1697 return branch->merge[0]->dst;
1698 }
1699
1700 static const char *tracking_for_push_dest(struct remote *remote,
1701 const char *refname,
1702 struct strbuf *err)
1703 {
1704 char *ret;
1705
1706 ret = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
1707 if (!ret)
1708 return error_buf(err,
1709 _("push destination '%s' on remote '%s' has no local tracking branch"),
1710 refname, remote->name);
1711 return ret;
1712 }
1713
1714 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1715 {
1716 struct remote *remote;
1717
1718 if (!branch)
1719 return error_buf(err, _("HEAD does not point to a branch"));
1720
1721 remote = remote_get(pushremote_for_branch(branch, NULL));
1722 if (!remote)
1723 return error_buf(err,
1724 _("branch '%s' has no remote for pushing"),
1725 branch->name);
1726
1727 if (remote->push_refspec_nr) {
1728 char *dst;
1729 const char *ret;
1730
1731 dst = apply_refspecs(remote->push, remote->push_refspec_nr,
1732 branch->refname);
1733 if (!dst)
1734 return error_buf(err,
1735 _("push refspecs for '%s' do not include '%s'"),
1736 remote->name, branch->name);
1737
1738 ret = tracking_for_push_dest(remote, dst, err);
1739 free(dst);
1740 return ret;
1741 }
1742
1743 if (remote->mirror)
1744 return tracking_for_push_dest(remote, branch->refname, err);
1745
1746 switch (push_default) {
1747 case PUSH_DEFAULT_NOTHING:
1748 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1749
1750 case PUSH_DEFAULT_MATCHING:
1751 case PUSH_DEFAULT_CURRENT:
1752 return tracking_for_push_dest(remote, branch->refname, err);
1753
1754 case PUSH_DEFAULT_UPSTREAM:
1755 return branch_get_upstream(branch, err);
1756
1757 case PUSH_DEFAULT_UNSPECIFIED:
1758 case PUSH_DEFAULT_SIMPLE:
1759 {
1760 const char *up, *cur;
1761
1762 up = branch_get_upstream(branch, err);
1763 if (!up)
1764 return NULL;
1765 cur = tracking_for_push_dest(remote, branch->refname, err);
1766 if (!cur)
1767 return NULL;
1768 if (strcmp(cur, up))
1769 return error_buf(err,
1770 _("cannot resolve 'simple' push to a single destination"));
1771 return cur;
1772 }
1773 }
1774
1775 die("BUG: unhandled push situation");
1776 }
1777
1778 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1779 {
1780 if (!branch->push_tracking_ref)
1781 branch->push_tracking_ref = branch_get_push_1(branch, err);
1782 return branch->push_tracking_ref;
1783 }
1784
1785 static int ignore_symref_update(const char *refname)
1786 {
1787 struct object_id oid;
1788 int flag;
1789
1790 if (!resolve_ref_unsafe(refname, 0, oid.hash, &flag))
1791 return 0; /* non-existing refs are OK */
1792 return (flag & REF_ISSYMREF);
1793 }
1794
1795 /*
1796 * Create and return a list of (struct ref) consisting of copies of
1797 * each remote_ref that matches refspec. refspec must be a pattern.
1798 * Fill in the copies' peer_ref to describe the local tracking refs to
1799 * which they map. Omit any references that would map to an existing
1800 * local symbolic ref.
1801 */
1802 static struct ref *get_expanded_map(const struct ref *remote_refs,
1803 const struct refspec *refspec)
1804 {
1805 const struct ref *ref;
1806 struct ref *ret = NULL;
1807 struct ref **tail = &ret;
1808
1809 for (ref = remote_refs; ref; ref = ref->next) {
1810 char *expn_name = NULL;
1811
1812 if (strchr(ref->name, '^'))
1813 continue; /* a dereference item */
1814 if (match_name_with_pattern(refspec->src, ref->name,
1815 refspec->dst, &expn_name) &&
1816 !ignore_symref_update(expn_name)) {
1817 struct ref *cpy = copy_ref(ref);
1818
1819 cpy->peer_ref = alloc_ref(expn_name);
1820 if (refspec->force)
1821 cpy->peer_ref->force = 1;
1822 *tail = cpy;
1823 tail = &cpy->next;
1824 }
1825 free(expn_name);
1826 }
1827
1828 return ret;
1829 }
1830
1831 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1832 {
1833 const struct ref *ref;
1834 for (ref = refs; ref; ref = ref->next) {
1835 if (refname_match(name, ref->name))
1836 return ref;
1837 }
1838 return NULL;
1839 }
1840
1841 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1842 {
1843 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1844
1845 if (!ref)
1846 return NULL;
1847
1848 return copy_ref(ref);
1849 }
1850
1851 static struct ref *get_local_ref(const char *name)
1852 {
1853 if (!name || name[0] == '\0')
1854 return NULL;
1855
1856 if (starts_with(name, "refs/"))
1857 return alloc_ref(name);
1858
1859 if (starts_with(name, "heads/") ||
1860 starts_with(name, "tags/") ||
1861 starts_with(name, "remotes/"))
1862 return alloc_ref_with_prefix("refs/", 5, name);
1863
1864 return alloc_ref_with_prefix("refs/heads/", 11, name);
1865 }
1866
1867 int get_fetch_map(const struct ref *remote_refs,
1868 const struct refspec *refspec,
1869 struct ref ***tail,
1870 int missing_ok)
1871 {
1872 struct ref *ref_map, **rmp;
1873
1874 if (refspec->pattern) {
1875 ref_map = get_expanded_map(remote_refs, refspec);
1876 } else {
1877 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1878
1879 if (refspec->exact_sha1) {
1880 ref_map = alloc_ref(name);
1881 get_oid_hex(name, &ref_map->old_oid);
1882 } else {
1883 ref_map = get_remote_ref(remote_refs, name);
1884 }
1885 if (!missing_ok && !ref_map)
1886 die("Couldn't find remote ref %s", name);
1887 if (ref_map) {
1888 ref_map->peer_ref = get_local_ref(refspec->dst);
1889 if (ref_map->peer_ref && refspec->force)
1890 ref_map->peer_ref->force = 1;
1891 }
1892 }
1893
1894 for (rmp = &ref_map; *rmp; ) {
1895 if ((*rmp)->peer_ref) {
1896 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1897 check_refname_format((*rmp)->peer_ref->name, 0)) {
1898 struct ref *ignore = *rmp;
1899 error("* Ignoring funny ref '%s' locally",
1900 (*rmp)->peer_ref->name);
1901 *rmp = (*rmp)->next;
1902 free(ignore->peer_ref);
1903 free(ignore);
1904 continue;
1905 }
1906 }
1907 rmp = &((*rmp)->next);
1908 }
1909
1910 if (ref_map)
1911 tail_link_ref(ref_map, tail);
1912
1913 return 0;
1914 }
1915
1916 int resolve_remote_symref(struct ref *ref, struct ref *list)
1917 {
1918 if (!ref->symref)
1919 return 0;
1920 for (; list; list = list->next)
1921 if (!strcmp(ref->symref, list->name)) {
1922 oidcpy(&ref->old_oid, &list->old_oid);
1923 return 0;
1924 }
1925 return 1;
1926 }
1927
1928 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1929 {
1930 while (list) {
1931 struct commit *commit = pop_commit(&list);
1932 commit->object.flags &= ~mark;
1933 }
1934 }
1935
1936 int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid)
1937 {
1938 struct object *o;
1939 struct commit *old, *new;
1940 struct commit_list *list, *used;
1941 int found = 0;
1942
1943 /*
1944 * Both new and old must be commit-ish and new is descendant of
1945 * old. Otherwise we require --force.
1946 */
1947 o = deref_tag(parse_object(old_oid->hash), NULL, 0);
1948 if (!o || o->type != OBJ_COMMIT)
1949 return 0;
1950 old = (struct commit *) o;
1951
1952 o = deref_tag(parse_object(new_oid->hash), NULL, 0);
1953 if (!o || o->type != OBJ_COMMIT)
1954 return 0;
1955 new = (struct commit *) o;
1956
1957 if (parse_commit(new) < 0)
1958 return 0;
1959
1960 used = list = NULL;
1961 commit_list_insert(new, &list);
1962 while (list) {
1963 new = pop_most_recent_commit(&list, TMP_MARK);
1964 commit_list_insert(new, &used);
1965 if (new == old) {
1966 found = 1;
1967 break;
1968 }
1969 }
1970 unmark_and_free(list, TMP_MARK);
1971 unmark_and_free(used, TMP_MARK);
1972 return found;
1973 }
1974
1975 /*
1976 * Compare a branch with its upstream, and save their differences (number
1977 * of commits) in *num_ours and *num_theirs. The name of the upstream branch
1978 * (or NULL if no upstream is defined) is returned via *upstream_name, if it
1979 * is not itself NULL.
1980 *
1981 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1982 * upstream defined, or ref does not exist), 0 otherwise.
1983 */
1984 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1985 const char **upstream_name)
1986 {
1987 struct object_id oid;
1988 struct commit *ours, *theirs;
1989 struct rev_info revs;
1990 const char *base;
1991 struct argv_array argv = ARGV_ARRAY_INIT;
1992
1993 /* Cannot stat unless we are marked to build on top of somebody else. */
1994 base = branch_get_upstream(branch, NULL);
1995 if (upstream_name)
1996 *upstream_name = base;
1997 if (!base)
1998 return -1;
1999
2000 /* Cannot stat if what we used to build on no longer exists */
2001 if (read_ref(base, oid.hash))
2002 return -1;
2003 theirs = lookup_commit_reference(oid.hash);
2004 if (!theirs)
2005 return -1;
2006
2007 if (read_ref(branch->refname, oid.hash))
2008 return -1;
2009 ours = lookup_commit_reference(oid.hash);
2010 if (!ours)
2011 return -1;
2012
2013 /* are we the same? */
2014 if (theirs == ours) {
2015 *num_theirs = *num_ours = 0;
2016 return 0;
2017 }
2018
2019 /* Run "rev-list --left-right ours...theirs" internally... */
2020 argv_array_push(&argv, ""); /* ignored */
2021 argv_array_push(&argv, "--left-right");
2022 argv_array_pushf(&argv, "%s...%s",
2023 oid_to_hex(&ours->object.oid),
2024 oid_to_hex(&theirs->object.oid));
2025 argv_array_push(&argv, "--");
2026
2027 init_revisions(&revs, NULL);
2028 setup_revisions(argv.argc, argv.argv, &revs, NULL);
2029 if (prepare_revision_walk(&revs))
2030 die("revision walk setup failed");
2031
2032 /* ... and count the commits on each side. */
2033 *num_ours = 0;
2034 *num_theirs = 0;
2035 while (1) {
2036 struct commit *c = get_revision(&revs);
2037 if (!c)
2038 break;
2039 if (c->object.flags & SYMMETRIC_LEFT)
2040 (*num_ours)++;
2041 else
2042 (*num_theirs)++;
2043 }
2044
2045 /* clear object flags smudged by the above traversal */
2046 clear_commit_marks(ours, ALL_REV_FLAGS);
2047 clear_commit_marks(theirs, ALL_REV_FLAGS);
2048
2049 argv_array_clear(&argv);
2050 return 0;
2051 }
2052
2053 /*
2054 * Return true when there is anything to report, otherwise false.
2055 */
2056 int format_tracking_info(struct branch *branch, struct strbuf *sb)
2057 {
2058 int ours, theirs;
2059 const char *full_base;
2060 char *base;
2061 int upstream_is_gone = 0;
2062
2063 if (stat_tracking_info(branch, &ours, &theirs, &full_base) < 0) {
2064 if (!full_base)
2065 return 0;
2066 upstream_is_gone = 1;
2067 }
2068
2069 base = shorten_unambiguous_ref(full_base, 0);
2070 if (upstream_is_gone) {
2071 strbuf_addf(sb,
2072 _("Your branch is based on '%s', but the upstream is gone.\n"),
2073 base);
2074 if (advice_status_hints)
2075 strbuf_addf(sb,
2076 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
2077 } else if (!ours && !theirs) {
2078 strbuf_addf(sb,
2079 _("Your branch is up-to-date with '%s'.\n"),
2080 base);
2081 } else if (!theirs) {
2082 strbuf_addf(sb,
2083 Q_("Your branch is ahead of '%s' by %d commit.\n",
2084 "Your branch is ahead of '%s' by %d commits.\n",
2085 ours),
2086 base, ours);
2087 if (advice_status_hints)
2088 strbuf_addf(sb,
2089 _(" (use \"git push\" to publish your local commits)\n"));
2090 } else if (!ours) {
2091 strbuf_addf(sb,
2092 Q_("Your branch is behind '%s' by %d commit, "
2093 "and can be fast-forwarded.\n",
2094 "Your branch is behind '%s' by %d commits, "
2095 "and can be fast-forwarded.\n",
2096 theirs),
2097 base, theirs);
2098 if (advice_status_hints)
2099 strbuf_addf(sb,
2100 _(" (use \"git pull\" to update your local branch)\n"));
2101 } else {
2102 strbuf_addf(sb,
2103 Q_("Your branch and '%s' have diverged,\n"
2104 "and have %d and %d different commit each, "
2105 "respectively.\n",
2106 "Your branch and '%s' have diverged,\n"
2107 "and have %d and %d different commits each, "
2108 "respectively.\n",
2109 theirs),
2110 base, ours, theirs);
2111 if (advice_status_hints)
2112 strbuf_addf(sb,
2113 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2114 }
2115 free(base);
2116 return 1;
2117 }
2118
2119 static int one_local_ref(const char *refname, const struct object_id *oid,
2120 int flag, void *cb_data)
2121 {
2122 struct ref ***local_tail = cb_data;
2123 struct ref *ref;
2124 int len;
2125
2126 /* we already know it starts with refs/ to get here */
2127 if (check_refname_format(refname + 5, 0))
2128 return 0;
2129
2130 len = strlen(refname) + 1;
2131 ref = xcalloc(1, sizeof(*ref) + len);
2132 oidcpy(&ref->new_oid, oid);
2133 memcpy(ref->name, refname, len);
2134 **local_tail = ref;
2135 *local_tail = &ref->next;
2136 return 0;
2137 }
2138
2139 struct ref *get_local_heads(void)
2140 {
2141 struct ref *local_refs = NULL, **local_tail = &local_refs;
2142
2143 for_each_ref(one_local_ref, &local_tail);
2144 return local_refs;
2145 }
2146
2147 struct ref *guess_remote_head(const struct ref *head,
2148 const struct ref *refs,
2149 int all)
2150 {
2151 const struct ref *r;
2152 struct ref *list = NULL;
2153 struct ref **tail = &list;
2154
2155 if (!head)
2156 return NULL;
2157
2158 /*
2159 * Some transports support directly peeking at
2160 * where HEAD points; if that is the case, then
2161 * we don't have to guess.
2162 */
2163 if (head->symref)
2164 return copy_ref(find_ref_by_name(refs, head->symref));
2165
2166 /* If refs/heads/master could be right, it is. */
2167 if (!all) {
2168 r = find_ref_by_name(refs, "refs/heads/master");
2169 if (r && !oidcmp(&r->old_oid, &head->old_oid))
2170 return copy_ref(r);
2171 }
2172
2173 /* Look for another ref that points there */
2174 for (r = refs; r; r = r->next) {
2175 if (r != head &&
2176 starts_with(r->name, "refs/heads/") &&
2177 !oidcmp(&r->old_oid, &head->old_oid)) {
2178 *tail = copy_ref(r);
2179 tail = &((*tail)->next);
2180 if (!all)
2181 break;
2182 }
2183 }
2184
2185 return list;
2186 }
2187
2188 struct stale_heads_info {
2189 struct string_list *ref_names;
2190 struct ref **stale_refs_tail;
2191 struct refspec *refs;
2192 int ref_count;
2193 };
2194
2195 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2196 int flags, void *cb_data)
2197 {
2198 struct stale_heads_info *info = cb_data;
2199 struct string_list matches = STRING_LIST_INIT_DUP;
2200 struct refspec query;
2201 int i, stale = 1;
2202 memset(&query, 0, sizeof(struct refspec));
2203 query.dst = (char *)refname;
2204
2205 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2206 if (matches.nr == 0)
2207 goto clean_exit; /* No matches */
2208
2209 /*
2210 * If we did find a suitable refspec and it's not a symref and
2211 * it's not in the list of refs that currently exist in that
2212 * remote, we consider it to be stale. In order to deal with
2213 * overlapping refspecs, we need to go over all of the
2214 * matching refs.
2215 */
2216 if (flags & REF_ISSYMREF)
2217 goto clean_exit;
2218
2219 for (i = 0; stale && i < matches.nr; i++)
2220 if (string_list_has_string(info->ref_names, matches.items[i].string))
2221 stale = 0;
2222
2223 if (stale) {
2224 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2225 oidcpy(&ref->new_oid, oid);
2226 }
2227
2228 clean_exit:
2229 string_list_clear(&matches, 0);
2230 return 0;
2231 }
2232
2233 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2234 {
2235 struct ref *ref, *stale_refs = NULL;
2236 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2237 struct stale_heads_info info;
2238
2239 info.ref_names = &ref_names;
2240 info.stale_refs_tail = &stale_refs;
2241 info.refs = refs;
2242 info.ref_count = ref_count;
2243 for (ref = fetch_map; ref; ref = ref->next)
2244 string_list_append(&ref_names, ref->name);
2245 string_list_sort(&ref_names);
2246 for_each_ref(get_stale_heads_cb, &info);
2247 string_list_clear(&ref_names, 0);
2248 return stale_refs;
2249 }
2250
2251 /*
2252 * Compare-and-swap
2253 */
2254 static void clear_cas_option(struct push_cas_option *cas)
2255 {
2256 int i;
2257
2258 for (i = 0; i < cas->nr; i++)
2259 free(cas->entry[i].refname);
2260 free(cas->entry);
2261 memset(cas, 0, sizeof(*cas));
2262 }
2263
2264 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2265 const char *refname,
2266 size_t refnamelen)
2267 {
2268 struct push_cas *entry;
2269 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2270 entry = &cas->entry[cas->nr++];
2271 memset(entry, 0, sizeof(*entry));
2272 entry->refname = xmemdupz(refname, refnamelen);
2273 return entry;
2274 }
2275
2276 int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2277 {
2278 const char *colon;
2279 struct push_cas *entry;
2280
2281 if (unset) {
2282 /* "--no-<option>" */
2283 clear_cas_option(cas);
2284 return 0;
2285 }
2286
2287 if (!arg) {
2288 /* just "--<option>" */
2289 cas->use_tracking_for_rest = 1;
2290 return 0;
2291 }
2292
2293 /* "--<option>=refname" or "--<option>=refname:value" */
2294 colon = strchrnul(arg, ':');
2295 entry = add_cas_entry(cas, arg, colon - arg);
2296 if (!*colon)
2297 entry->use_tracking = 1;
2298 else if (get_sha1(colon + 1, entry->expect))
2299 return error("cannot parse expected object name '%s'", colon + 1);
2300 return 0;
2301 }
2302
2303 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2304 {
2305 return parse_push_cas_option(opt->value, arg, unset);
2306 }
2307
2308 int is_empty_cas(const struct push_cas_option *cas)
2309 {
2310 return !cas->use_tracking_for_rest && !cas->nr;
2311 }
2312
2313 /*
2314 * Look at remote.fetch refspec and see if we have a remote
2315 * tracking branch for the refname there. Fill its current
2316 * value in sha1[].
2317 * If we cannot do so, return negative to signal an error.
2318 */
2319 static int remote_tracking(struct remote *remote, const char *refname,
2320 struct object_id *oid)
2321 {
2322 char *dst;
2323
2324 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2325 if (!dst)
2326 return -1; /* no tracking ref for refname at remote */
2327 if (read_ref(dst, oid->hash))
2328 return -1; /* we know what the tracking ref is but we cannot read it */
2329 return 0;
2330 }
2331
2332 static void apply_cas(struct push_cas_option *cas,
2333 struct remote *remote,
2334 struct ref *ref)
2335 {
2336 int i;
2337
2338 /* Find an explicit --<option>=<name>[:<value>] entry */
2339 for (i = 0; i < cas->nr; i++) {
2340 struct push_cas *entry = &cas->entry[i];
2341 if (!refname_match(entry->refname, ref->name))
2342 continue;
2343 ref->expect_old_sha1 = 1;
2344 if (!entry->use_tracking)
2345 hashcpy(ref->old_oid_expect.hash, cas->entry[i].expect);
2346 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2347 ref->expect_old_no_trackback = 1;
2348 return;
2349 }
2350
2351 /* Are we using "--<option>" to cover all? */
2352 if (!cas->use_tracking_for_rest)
2353 return;
2354
2355 ref->expect_old_sha1 = 1;
2356 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2357 ref->expect_old_no_trackback = 1;
2358 }
2359
2360 void apply_push_cas(struct push_cas_option *cas,
2361 struct remote *remote,
2362 struct ref *remote_refs)
2363 {
2364 struct ref *ref;
2365 for (ref = remote_refs; ref; ref = ref->next)
2366 apply_cas(cas, remote, ref);
2367 }
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