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shortlog: optimize out useless string list
[alt-git.git] / remote.c
blob9d34b5a5dafa217e2ce9cb1b7e9a4ab74908f7af
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, '\n') != 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(&buf, f, '\n');
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, ".vcs")) {
432 return git_config_string(&remote->foreign_vcs, key, value);
433 }
434 return 0;
435 }
436
437 static void alias_all_urls(void)
438 {
439 int i, j;
440 for (i = 0; i < remotes_nr; i++) {
441 int add_pushurl_aliases;
442 if (!remotes[i])
443 continue;
444 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
445 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
446 }
447 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
448 for (j = 0; j < remotes[i]->url_nr; j++) {
449 if (add_pushurl_aliases)
450 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
451 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
452 }
453 }
454 }
455
456 static void read_config(void)
457 {
458 static int loaded;
459 struct object_id oid;
460 const char *head_ref;
461 int flag;
462
463 if (loaded)
464 return;
465 loaded = 1;
466
467 current_branch = NULL;
468 head_ref = resolve_ref_unsafe("HEAD", 0, oid.hash, &flag);
469 if (head_ref && (flag & REF_ISSYMREF) &&
470 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
471 current_branch = make_branch(head_ref, 0);
472 }
473 git_config(handle_config, NULL);
474 alias_all_urls();
475 }
476
477 /*
478 * This function frees a refspec array.
479 * Warning: code paths should be checked to ensure that the src
480 * and dst pointers are always freeable pointers as well
481 * as the refspec pointer itself.
482 */
483 static void free_refspecs(struct refspec *refspec, int nr_refspec)
484 {
485 int i;
486
487 if (!refspec)
488 return;
489
490 for (i = 0; i < nr_refspec; i++) {
491 free(refspec[i].src);
492 free(refspec[i].dst);
493 }
494 free(refspec);
495 }
496
497 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
498 {
499 int i;
500 struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
501
502 for (i = 0; i < nr_refspec; i++) {
503 size_t llen;
504 int is_glob;
505 const char *lhs, *rhs;
506 int flags;
507
508 is_glob = 0;
509
510 lhs = refspec[i];
511 if (*lhs == '+') {
512 rs[i].force = 1;
513 lhs++;
514 }
515
516 rhs = strrchr(lhs, ':');
517
518 /*
519 * Before going on, special case ":" (or "+:") as a refspec
520 * for pushing matching refs.
521 */
522 if (!fetch && rhs == lhs && rhs[1] == '\0') {
523 rs[i].matching = 1;
524 continue;
525 }
526
527 if (rhs) {
528 size_t rlen = strlen(++rhs);
529 is_glob = (1 <= rlen && strchr(rhs, '*'));
530 rs[i].dst = xstrndup(rhs, rlen);
531 }
532
533 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
534 if (1 <= llen && memchr(lhs, '*', llen)) {
535 if ((rhs && !is_glob) || (!rhs && fetch))
536 goto invalid;
537 is_glob = 1;
538 } else if (rhs && is_glob) {
539 goto invalid;
540 }
541
542 rs[i].pattern = is_glob;
543 rs[i].src = xstrndup(lhs, llen);
544 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
545
546 if (fetch) {
547 struct object_id unused;
548
549 /* LHS */
550 if (!*rs[i].src)
551 ; /* empty is ok; it means "HEAD" */
552 else if (llen == GIT_SHA1_HEXSZ && !get_oid_hex(rs[i].src, &unused))
553 rs[i].exact_sha1 = 1; /* ok */
554 else if (!check_refname_format(rs[i].src, flags))
555 ; /* valid looking ref is ok */
556 else
557 goto invalid;
558 /* RHS */
559 if (!rs[i].dst)
560 ; /* missing is ok; it is the same as empty */
561 else if (!*rs[i].dst)
562 ; /* empty is ok; it means "do not store" */
563 else if (!check_refname_format(rs[i].dst, flags))
564 ; /* valid looking ref is ok */
565 else
566 goto invalid;
567 } else {
568 /*
569 * LHS
570 * - empty is allowed; it means delete.
571 * - when wildcarded, it must be a valid looking ref.
572 * - otherwise, it must be an extended SHA-1, but
573 * there is no existing way to validate this.
574 */
575 if (!*rs[i].src)
576 ; /* empty is ok */
577 else if (is_glob) {
578 if (check_refname_format(rs[i].src, flags))
579 goto invalid;
580 }
581 else
582 ; /* anything goes, for now */
583 /*
584 * RHS
585 * - missing is allowed, but LHS then must be a
586 * valid looking ref.
587 * - empty is not allowed.
588 * - otherwise it must be a valid looking ref.
589 */
590 if (!rs[i].dst) {
591 if (check_refname_format(rs[i].src, flags))
592 goto invalid;
593 } else if (!*rs[i].dst) {
594 goto invalid;
595 } else {
596 if (check_refname_format(rs[i].dst, flags))
597 goto invalid;
598 }
599 }
600 }
601 return rs;
602
603 invalid:
604 if (verify) {
605 /*
606 * nr_refspec must be greater than zero and i must be valid
607 * since it is only possible to reach this point from within
608 * the for loop above.
609 */
610 free_refspecs(rs, i+1);
611 return NULL;
612 }
613 die("Invalid refspec '%s'", refspec[i]);
614 }
615
616 int valid_fetch_refspec(const char *fetch_refspec_str)
617 {
618 struct refspec *refspec;
619
620 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
621 free_refspecs(refspec, 1);
622 return !!refspec;
623 }
624
625 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
626 {
627 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
628 }
629
630 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
631 {
632 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
633 }
634
635 void free_refspec(int nr_refspec, struct refspec *refspec)
636 {
637 int i;
638 for (i = 0; i < nr_refspec; i++) {
639 free(refspec[i].src);
640 free(refspec[i].dst);
641 }
642 free(refspec);
643 }
644
645 static int valid_remote_nick(const char *name)
646 {
647 if (!name[0] || is_dot_or_dotdot(name))
648 return 0;
649 return !strchr(name, '/'); /* no slash */
650 }
651
652 const char *remote_for_branch(struct branch *branch, int *explicit)
653 {
654 if (branch && branch->remote_name) {
655 if (explicit)
656 *explicit = 1;
657 return branch->remote_name;
658 }
659 if (explicit)
660 *explicit = 0;
661 return "origin";
662 }
663
664 const char *pushremote_for_branch(struct branch *branch, int *explicit)
665 {
666 if (branch && branch->pushremote_name) {
667 if (explicit)
668 *explicit = 1;
669 return branch->pushremote_name;
670 }
671 if (pushremote_name) {
672 if (explicit)
673 *explicit = 1;
674 return pushremote_name;
675 }
676 return remote_for_branch(branch, explicit);
677 }
678
679 static struct remote *remote_get_1(const char *name,
680 const char *(*get_default)(struct branch *, int *))
681 {
682 struct remote *ret;
683 int name_given = 0;
684
685 read_config();
686
687 if (name)
688 name_given = 1;
689 else
690 name = get_default(current_branch, &name_given);
691
692 ret = make_remote(name, 0);
693 if (valid_remote_nick(name)) {
694 if (!valid_remote(ret))
695 read_remotes_file(ret);
696 if (!valid_remote(ret))
697 read_branches_file(ret);
698 }
699 if (name_given && !valid_remote(ret))
700 add_url_alias(ret, name);
701 if (!valid_remote(ret))
702 return NULL;
703 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
704 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
705 return ret;
706 }
707
708 struct remote *remote_get(const char *name)
709 {
710 return remote_get_1(name, remote_for_branch);
711 }
712
713 struct remote *pushremote_get(const char *name)
714 {
715 return remote_get_1(name, pushremote_for_branch);
716 }
717
718 int remote_is_configured(const char *name)
719 {
720 struct remotes_hash_key lookup;
721 struct hashmap_entry lookup_entry;
722 read_config();
723
724 init_remotes_hash();
725 lookup.str = name;
726 lookup.len = strlen(name);
727 hashmap_entry_init(&lookup_entry, memhash(name, lookup.len));
728
729 return hashmap_get(&remotes_hash, &lookup_entry, &lookup) != NULL;
730 }
731
732 int for_each_remote(each_remote_fn fn, void *priv)
733 {
734 int i, result = 0;
735 read_config();
736 for (i = 0; i < remotes_nr && !result; i++) {
737 struct remote *r = remotes[i];
738 if (!r)
739 continue;
740 if (!r->fetch)
741 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
742 r->fetch_refspec);
743 if (!r->push)
744 r->push = parse_push_refspec(r->push_refspec_nr,
745 r->push_refspec);
746 result = fn(r, priv);
747 }
748 return result;
749 }
750
751 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
752 {
753 if (strcmp(ref1->name, ref2->name)) {
754 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
755 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
756 die(_("Cannot fetch both %s and %s to %s"),
757 ref1->name, ref2->name, ref2->peer_ref->name);
758 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
759 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
760 warning(_("%s usually tracks %s, not %s"),
761 ref2->peer_ref->name, ref2->name, ref1->name);
762 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
763 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
764 die(_("%s tracks both %s and %s"),
765 ref2->peer_ref->name, ref1->name, ref2->name);
766 } else {
767 /*
768 * This last possibility doesn't occur because
769 * FETCH_HEAD_IGNORE entries always appear at
770 * the end of the list.
771 */
772 die(_("Internal error"));
773 }
774 }
775 free(ref2->peer_ref);
776 free(ref2);
777 }
778
779 struct ref *ref_remove_duplicates(struct ref *ref_map)
780 {
781 struct string_list refs = STRING_LIST_INIT_NODUP;
782 struct ref *retval = NULL;
783 struct ref **p = &retval;
784
785 while (ref_map) {
786 struct ref *ref = ref_map;
787
788 ref_map = ref_map->next;
789 ref->next = NULL;
790
791 if (!ref->peer_ref) {
792 *p = ref;
793 p = &ref->next;
794 } else {
795 struct string_list_item *item =
796 string_list_insert(&refs, ref->peer_ref->name);
797
798 if (item->util) {
799 /* Entry already existed */
800 handle_duplicate((struct ref *)item->util, ref);
801 } else {
802 *p = ref;
803 p = &ref->next;
804 item->util = ref;
805 }
806 }
807 }
808
809 string_list_clear(&refs, 0);
810 return retval;
811 }
812
813 int remote_has_url(struct remote *remote, const char *url)
814 {
815 int i;
816 for (i = 0; i < remote->url_nr; i++) {
817 if (!strcmp(remote->url[i], url))
818 return 1;
819 }
820 return 0;
821 }
822
823 static int match_name_with_pattern(const char *key, const char *name,
824 const char *value, char **result)
825 {
826 const char *kstar = strchr(key, '*');
827 size_t klen;
828 size_t ksuffixlen;
829 size_t namelen;
830 int ret;
831 if (!kstar)
832 die("Key '%s' of pattern had no '*'", key);
833 klen = kstar - key;
834 ksuffixlen = strlen(kstar + 1);
835 namelen = strlen(name);
836 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
837 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
838 if (ret && value) {
839 struct strbuf sb = STRBUF_INIT;
840 const char *vstar = strchr(value, '*');
841 if (!vstar)
842 die("Value '%s' of pattern has no '*'", value);
843 strbuf_add(&sb, value, vstar - value);
844 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
845 strbuf_addstr(&sb, vstar + 1);
846 *result = strbuf_detach(&sb, NULL);
847 }
848 return ret;
849 }
850
851 static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
852 {
853 int i;
854 int find_src = !query->src;
855
856 if (find_src && !query->dst)
857 error("query_refspecs_multiple: need either src or dst");
858
859 for (i = 0; i < ref_count; i++) {
860 struct refspec *refspec = &refs[i];
861 const char *key = find_src ? refspec->dst : refspec->src;
862 const char *value = find_src ? refspec->src : refspec->dst;
863 const char *needle = find_src ? query->dst : query->src;
864 char **result = find_src ? &query->src : &query->dst;
865
866 if (!refspec->dst)
867 continue;
868 if (refspec->pattern) {
869 if (match_name_with_pattern(key, needle, value, result))
870 string_list_append_nodup(results, *result);
871 } else if (!strcmp(needle, key)) {
872 string_list_append(results, value);
873 }
874 }
875 }
876
877 int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
878 {
879 int i;
880 int find_src = !query->src;
881 const char *needle = find_src ? query->dst : query->src;
882 char **result = find_src ? &query->src : &query->dst;
883
884 if (find_src && !query->dst)
885 return error("query_refspecs: need either src or dst");
886
887 for (i = 0; i < ref_count; i++) {
888 struct refspec *refspec = &refs[i];
889 const char *key = find_src ? refspec->dst : refspec->src;
890 const char *value = find_src ? refspec->src : refspec->dst;
891
892 if (!refspec->dst)
893 continue;
894 if (refspec->pattern) {
895 if (match_name_with_pattern(key, needle, value, result)) {
896 query->force = refspec->force;
897 return 0;
898 }
899 } else if (!strcmp(needle, key)) {
900 *result = xstrdup(value);
901 query->force = refspec->force;
902 return 0;
903 }
904 }
905 return -1;
906 }
907
908 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
909 const char *name)
910 {
911 struct refspec query;
912
913 memset(&query, 0, sizeof(struct refspec));
914 query.src = (char *)name;
915
916 if (query_refspecs(refspecs, nr_refspec, &query))
917 return NULL;
918
919 return query.dst;
920 }
921
922 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
923 {
924 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
925 }
926
927 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
928 const char *name)
929 {
930 size_t len = strlen(name);
931 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
932 memcpy(ref->name, prefix, prefixlen);
933 memcpy(ref->name + prefixlen, name, len);
934 return ref;
935 }
936
937 struct ref *alloc_ref(const char *name)
938 {
939 return alloc_ref_with_prefix("", 0, name);
940 }
941
942 struct ref *copy_ref(const struct ref *ref)
943 {
944 struct ref *cpy;
945 size_t len;
946 if (!ref)
947 return NULL;
948 len = strlen(ref->name);
949 cpy = xmalloc(sizeof(struct ref) + len + 1);
950 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
951 cpy->next = NULL;
952 cpy->symref = xstrdup_or_null(ref->symref);
953 cpy->remote_status = xstrdup_or_null(ref->remote_status);
954 cpy->peer_ref = copy_ref(ref->peer_ref);
955 return cpy;
956 }
957
958 struct ref *copy_ref_list(const struct ref *ref)
959 {
960 struct ref *ret = NULL;
961 struct ref **tail = &ret;
962 while (ref) {
963 *tail = copy_ref(ref);
964 ref = ref->next;
965 tail = &((*tail)->next);
966 }
967 return ret;
968 }
969
970 static void free_ref(struct ref *ref)
971 {
972 if (!ref)
973 return;
974 free_ref(ref->peer_ref);
975 free(ref->remote_status);
976 free(ref->symref);
977 free(ref);
978 }
979
980 void free_refs(struct ref *ref)
981 {
982 struct ref *next;
983 while (ref) {
984 next = ref->next;
985 free_ref(ref);
986 ref = next;
987 }
988 }
989
990 int ref_compare_name(const void *va, const void *vb)
991 {
992 const struct ref *a = va, *b = vb;
993 return strcmp(a->name, b->name);
994 }
995
996 static void *ref_list_get_next(const void *a)
997 {
998 return ((const struct ref *)a)->next;
999 }
1000
1001 static void ref_list_set_next(void *a, void *next)
1002 {
1003 ((struct ref *)a)->next = next;
1004 }
1005
1006 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
1007 {
1008 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
1009 }
1010
1011 int count_refspec_match(const char *pattern,
1012 struct ref *refs,
1013 struct ref **matched_ref)
1014 {
1015 int patlen = strlen(pattern);
1016 struct ref *matched_weak = NULL;
1017 struct ref *matched = NULL;
1018 int weak_match = 0;
1019 int match = 0;
1020
1021 for (weak_match = match = 0; refs; refs = refs->next) {
1022 char *name = refs->name;
1023 int namelen = strlen(name);
1024
1025 if (!refname_match(pattern, name))
1026 continue;
1027
1028 /* A match is "weak" if it is with refs outside
1029 * heads or tags, and did not specify the pattern
1030 * in full (e.g. "refs/remotes/origin/master") or at
1031 * least from the toplevel (e.g. "remotes/origin/master");
1032 * otherwise "git push $URL master" would result in
1033 * ambiguity between remotes/origin/master and heads/master
1034 * at the remote site.
1035 */
1036 if (namelen != patlen &&
1037 patlen != namelen - 5 &&
1038 !starts_with(name, "refs/heads/") &&
1039 !starts_with(name, "refs/tags/")) {
1040 /* We want to catch the case where only weak
1041 * matches are found and there are multiple
1042 * matches, and where more than one strong
1043 * matches are found, as ambiguous. One
1044 * strong match with zero or more weak matches
1045 * are acceptable as a unique match.
1046 */
1047 matched_weak = refs;
1048 weak_match++;
1049 }
1050 else {
1051 matched = refs;
1052 match++;
1053 }
1054 }
1055 if (!matched) {
1056 if (matched_ref)
1057 *matched_ref = matched_weak;
1058 return weak_match;
1059 }
1060 else {
1061 if (matched_ref)
1062 *matched_ref = matched;
1063 return match;
1064 }
1065 }
1066
1067 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1068 {
1069 **tail = ref;
1070 while (ref->next)
1071 ref = ref->next;
1072 *tail = &ref->next;
1073 }
1074
1075 static struct ref *alloc_delete_ref(void)
1076 {
1077 struct ref *ref = alloc_ref("(delete)");
1078 oidclr(&ref->new_oid);
1079 return ref;
1080 }
1081
1082 static int try_explicit_object_name(const char *name,
1083 struct ref **match)
1084 {
1085 struct object_id oid;
1086
1087 if (!*name) {
1088 if (match)
1089 *match = alloc_delete_ref();
1090 return 0;
1091 }
1092
1093 if (get_sha1(name, oid.hash))
1094 return -1;
1095
1096 if (match) {
1097 *match = alloc_ref(name);
1098 oidcpy(&(*match)->new_oid, &oid);
1099 }
1100 return 0;
1101 }
1102
1103 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1104 {
1105 struct ref *ret = alloc_ref(name);
1106 tail_link_ref(ret, tail);
1107 return ret;
1108 }
1109
1110 static char *guess_ref(const char *name, struct ref *peer)
1111 {
1112 struct strbuf buf = STRBUF_INIT;
1113 struct object_id oid;
1114
1115 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1116 oid.hash, NULL);
1117 if (!r)
1118 return NULL;
1119
1120 if (starts_with(r, "refs/heads/"))
1121 strbuf_addstr(&buf, "refs/heads/");
1122 else if (starts_with(r, "refs/tags/"))
1123 strbuf_addstr(&buf, "refs/tags/");
1124 else
1125 return NULL;
1126
1127 strbuf_addstr(&buf, name);
1128 return strbuf_detach(&buf, NULL);
1129 }
1130
1131 static int match_explicit_lhs(struct ref *src,
1132 struct refspec *rs,
1133 struct ref **match,
1134 int *allocated_match)
1135 {
1136 switch (count_refspec_match(rs->src, src, match)) {
1137 case 1:
1138 if (allocated_match)
1139 *allocated_match = 0;
1140 return 0;
1141 case 0:
1142 /* The source could be in the get_sha1() format
1143 * not a reference name. :refs/other is a
1144 * way to delete 'other' ref at the remote end.
1145 */
1146 if (try_explicit_object_name(rs->src, match) < 0)
1147 return error("src refspec %s does not match any.", rs->src);
1148 if (allocated_match)
1149 *allocated_match = 1;
1150 return 0;
1151 default:
1152 return error("src refspec %s matches more than one.", rs->src);
1153 }
1154 }
1155
1156 static int match_explicit(struct ref *src, struct ref *dst,
1157 struct ref ***dst_tail,
1158 struct refspec *rs)
1159 {
1160 struct ref *matched_src, *matched_dst;
1161 int allocated_src;
1162
1163 const char *dst_value = rs->dst;
1164 char *dst_guess;
1165
1166 if (rs->pattern || rs->matching)
1167 return 0;
1168
1169 matched_src = matched_dst = NULL;
1170 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1171 return -1;
1172
1173 if (!dst_value) {
1174 struct object_id oid;
1175 int flag;
1176
1177 dst_value = resolve_ref_unsafe(matched_src->name,
1178 RESOLVE_REF_READING,
1179 oid.hash, &flag);
1180 if (!dst_value ||
1181 ((flag & REF_ISSYMREF) &&
1182 !starts_with(dst_value, "refs/heads/")))
1183 die("%s cannot be resolved to branch.",
1184 matched_src->name);
1185 }
1186
1187 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1188 case 1:
1189 break;
1190 case 0:
1191 if (starts_with(dst_value, "refs/"))
1192 matched_dst = make_linked_ref(dst_value, dst_tail);
1193 else if (is_null_oid(&matched_src->new_oid))
1194 error("unable to delete '%s': remote ref does not exist",
1195 dst_value);
1196 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1197 matched_dst = make_linked_ref(dst_guess, dst_tail);
1198 else
1199 error("unable to push to unqualified destination: %s\n"
1200 "The destination refspec neither matches an "
1201 "existing ref on the remote nor\n"
1202 "begins with refs/, and we are unable to "
1203 "guess a prefix based on the source ref.",
1204 dst_value);
1205 break;
1206 default:
1207 matched_dst = NULL;
1208 error("dst refspec %s matches more than one.",
1209 dst_value);
1210 break;
1211 }
1212 if (!matched_dst)
1213 return -1;
1214 if (matched_dst->peer_ref)
1215 return error("dst ref %s receives from more than one src.",
1216 matched_dst->name);
1217 else {
1218 matched_dst->peer_ref = allocated_src ?
1219 matched_src :
1220 copy_ref(matched_src);
1221 matched_dst->force = rs->force;
1222 }
1223 return 0;
1224 }
1225
1226 static int match_explicit_refs(struct ref *src, struct ref *dst,
1227 struct ref ***dst_tail, struct refspec *rs,
1228 int rs_nr)
1229 {
1230 int i, errs;
1231 for (i = errs = 0; i < rs_nr; i++)
1232 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1233 return errs;
1234 }
1235
1236 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1237 int send_mirror, int direction, const struct refspec **ret_pat)
1238 {
1239 const struct refspec *pat;
1240 char *name;
1241 int i;
1242 int matching_refs = -1;
1243 for (i = 0; i < rs_nr; i++) {
1244 if (rs[i].matching &&
1245 (matching_refs == -1 || rs[i].force)) {
1246 matching_refs = i;
1247 continue;
1248 }
1249
1250 if (rs[i].pattern) {
1251 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1252 int match;
1253 if (direction == FROM_SRC)
1254 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1255 else
1256 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1257 if (match) {
1258 matching_refs = i;
1259 break;
1260 }
1261 }
1262 }
1263 if (matching_refs == -1)
1264 return NULL;
1265
1266 pat = rs + matching_refs;
1267 if (pat->matching) {
1268 /*
1269 * "matching refs"; traditionally we pushed everything
1270 * including refs outside refs/heads/ hierarchy, but
1271 * that does not make much sense these days.
1272 */
1273 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1274 return NULL;
1275 name = xstrdup(ref->name);
1276 }
1277 if (ret_pat)
1278 *ret_pat = pat;
1279 return name;
1280 }
1281
1282 static struct ref **tail_ref(struct ref **head)
1283 {
1284 struct ref **tail = head;
1285 while (*tail)
1286 tail = &((*tail)->next);
1287 return tail;
1288 }
1289
1290 struct tips {
1291 struct commit **tip;
1292 int nr, alloc;
1293 };
1294
1295 static void add_to_tips(struct tips *tips, const struct object_id *oid)
1296 {
1297 struct commit *commit;
1298
1299 if (is_null_oid(oid))
1300 return;
1301 commit = lookup_commit_reference_gently(oid->hash, 1);
1302 if (!commit || (commit->object.flags & TMP_MARK))
1303 return;
1304 commit->object.flags |= TMP_MARK;
1305 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1306 tips->tip[tips->nr++] = commit;
1307 }
1308
1309 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1310 {
1311 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1312 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1313 struct string_list_item *item;
1314 struct ref *ref;
1315 struct tips sent_tips;
1316
1317 /*
1318 * Collect everything we know they would have at the end of
1319 * this push, and collect all tags they have.
1320 */
1321 memset(&sent_tips, 0, sizeof(sent_tips));
1322 for (ref = *dst; ref; ref = ref->next) {
1323 if (ref->peer_ref &&
1324 !is_null_oid(&ref->peer_ref->new_oid))
1325 add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
1326 else
1327 add_to_tips(&sent_tips, &ref->old_oid);
1328 if (starts_with(ref->name, "refs/tags/"))
1329 string_list_append(&dst_tag, ref->name);
1330 }
1331 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1332
1333 string_list_sort(&dst_tag);
1334
1335 /* Collect tags they do not have. */
1336 for (ref = src; ref; ref = ref->next) {
1337 if (!starts_with(ref->name, "refs/tags/"))
1338 continue; /* not a tag */
1339 if (string_list_has_string(&dst_tag, ref->name))
1340 continue; /* they already have it */
1341 if (sha1_object_info(ref->new_oid.hash, NULL) != OBJ_TAG)
1342 continue; /* be conservative */
1343 item = string_list_append(&src_tag, ref->name);
1344 item->util = ref;
1345 }
1346 string_list_clear(&dst_tag, 0);
1347
1348 /*
1349 * At this point, src_tag lists tags that are missing from
1350 * dst, and sent_tips lists the tips we are pushing or those
1351 * that we know they already have. An element in the src_tag
1352 * that is an ancestor of any of the sent_tips needs to be
1353 * sent to the other side.
1354 */
1355 if (sent_tips.nr) {
1356 for_each_string_list_item(item, &src_tag) {
1357 struct ref *ref = item->util;
1358 struct ref *dst_ref;
1359 struct commit *commit;
1360
1361 if (is_null_oid(&ref->new_oid))
1362 continue;
1363 commit = lookup_commit_reference_gently(ref->new_oid.hash, 1);
1364 if (!commit)
1365 /* not pushing a commit, which is not an error */
1366 continue;
1367
1368 /*
1369 * Is this tag, which they do not have, reachable from
1370 * any of the commits we are sending?
1371 */
1372 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1373 continue;
1374
1375 /* Add it in */
1376 dst_ref = make_linked_ref(ref->name, dst_tail);
1377 oidcpy(&dst_ref->new_oid, &ref->new_oid);
1378 dst_ref->peer_ref = copy_ref(ref);
1379 }
1380 }
1381 string_list_clear(&src_tag, 0);
1382 free(sent_tips.tip);
1383 }
1384
1385 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1386 {
1387 for ( ; list; list = list->next)
1388 if (!strcmp(list->name, name))
1389 return (struct ref *)list;
1390 return NULL;
1391 }
1392
1393 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1394 {
1395 for ( ; ref; ref = ref->next)
1396 string_list_append_nodup(ref_index, ref->name)->util = ref;
1397
1398 string_list_sort(ref_index);
1399 }
1400
1401 /*
1402 * Given only the set of local refs, sanity-check the set of push
1403 * refspecs. We can't catch all errors that match_push_refs would,
1404 * but we can catch some errors early before even talking to the
1405 * remote side.
1406 */
1407 int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1408 {
1409 struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1410 int ret = 0;
1411 int i;
1412
1413 for (i = 0; i < nr_refspec; i++) {
1414 struct refspec *rs = refspec + i;
1415
1416 if (rs->pattern || rs->matching)
1417 continue;
1418
1419 ret |= match_explicit_lhs(src, rs, NULL, NULL);
1420 }
1421
1422 free_refspec(nr_refspec, refspec);
1423 return ret;
1424 }
1425
1426 /*
1427 * Given the set of refs the local repository has, the set of refs the
1428 * remote repository has, and the refspec used for push, determine
1429 * what remote refs we will update and with what value by setting
1430 * peer_ref (which object is being pushed) and force (if the push is
1431 * forced) in elements of "dst". The function may add new elements to
1432 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1433 */
1434 int match_push_refs(struct ref *src, struct ref **dst,
1435 int nr_refspec, const char **refspec, int flags)
1436 {
1437 struct refspec *rs;
1438 int send_all = flags & MATCH_REFS_ALL;
1439 int send_mirror = flags & MATCH_REFS_MIRROR;
1440 int send_prune = flags & MATCH_REFS_PRUNE;
1441 int errs;
1442 static const char *default_refspec[] = { ":", NULL };
1443 struct ref *ref, **dst_tail = tail_ref(dst);
1444 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1445
1446 if (!nr_refspec) {
1447 nr_refspec = 1;
1448 refspec = default_refspec;
1449 }
1450 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1451 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1452
1453 /* pick the remainder */
1454 for (ref = src; ref; ref = ref->next) {
1455 struct string_list_item *dst_item;
1456 struct ref *dst_peer;
1457 const struct refspec *pat = NULL;
1458 char *dst_name;
1459
1460 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1461 if (!dst_name)
1462 continue;
1463
1464 if (!dst_ref_index.nr)
1465 prepare_ref_index(&dst_ref_index, *dst);
1466
1467 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1468 dst_peer = dst_item ? dst_item->util : NULL;
1469 if (dst_peer) {
1470 if (dst_peer->peer_ref)
1471 /* We're already sending something to this ref. */
1472 goto free_name;
1473 } else {
1474 if (pat->matching && !(send_all || send_mirror))
1475 /*
1476 * Remote doesn't have it, and we have no
1477 * explicit pattern, and we don't have
1478 * --all or --mirror.
1479 */
1480 goto free_name;
1481
1482 /* Create a new one and link it */
1483 dst_peer = make_linked_ref(dst_name, &dst_tail);
1484 oidcpy(&dst_peer->new_oid, &ref->new_oid);
1485 string_list_insert(&dst_ref_index,
1486 dst_peer->name)->util = dst_peer;
1487 }
1488 dst_peer->peer_ref = copy_ref(ref);
1489 dst_peer->force = pat->force;
1490 free_name:
1491 free(dst_name);
1492 }
1493
1494 string_list_clear(&dst_ref_index, 0);
1495
1496 if (flags & MATCH_REFS_FOLLOW_TAGS)
1497 add_missing_tags(src, dst, &dst_tail);
1498
1499 if (send_prune) {
1500 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1501 /* check for missing refs on the remote */
1502 for (ref = *dst; ref; ref = ref->next) {
1503 char *src_name;
1504
1505 if (ref->peer_ref)
1506 /* We're already sending something to this ref. */
1507 continue;
1508
1509 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1510 if (src_name) {
1511 if (!src_ref_index.nr)
1512 prepare_ref_index(&src_ref_index, src);
1513 if (!string_list_has_string(&src_ref_index,
1514 src_name))
1515 ref->peer_ref = alloc_delete_ref();
1516 free(src_name);
1517 }
1518 }
1519 string_list_clear(&src_ref_index, 0);
1520 }
1521 if (errs)
1522 return -1;
1523 return 0;
1524 }
1525
1526 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1527 int force_update)
1528 {
1529 struct ref *ref;
1530
1531 for (ref = remote_refs; ref; ref = ref->next) {
1532 int force_ref_update = ref->force || force_update;
1533 int reject_reason = 0;
1534
1535 if (ref->peer_ref)
1536 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1537 else if (!send_mirror)
1538 continue;
1539
1540 ref->deletion = is_null_oid(&ref->new_oid);
1541 if (!ref->deletion &&
1542 !oidcmp(&ref->old_oid, &ref->new_oid)) {
1543 ref->status = REF_STATUS_UPTODATE;
1544 continue;
1545 }
1546
1547 /*
1548 * Bypass the usual "must fast-forward" check but
1549 * replace it with a weaker "the old value must be
1550 * this value we observed". If the remote ref has
1551 * moved and is now different from what we expect,
1552 * 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 }
1564
1565 /*
1566 * The usual "must fast-forward" rules.
1567 *
1568 * Decide whether an individual refspec A:B can be
1569 * pushed. The push will succeed if any of the
1570 * following are true:
1571 *
1572 * (1) the remote reference B does not exist
1573 *
1574 * (2) the remote reference B is being removed (i.e.,
1575 * pushing :B where no source is specified)
1576 *
1577 * (3) the destination is not under refs/tags/, and
1578 * if the old and new value is a commit, the new
1579 * is a descendant of the old.
1580 *
1581 * (4) it is forced using the +A:B notation, or by
1582 * passing the --force argument
1583 */
1584
1585 else if (!ref->deletion && !is_null_oid(&ref->old_oid)) {
1586 if (starts_with(ref->name, "refs/tags/"))
1587 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1588 else if (!has_object_file(&ref->old_oid))
1589 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1590 else if (!lookup_commit_reference_gently(ref->old_oid.hash, 1) ||
1591 !lookup_commit_reference_gently(ref->new_oid.hash, 1))
1592 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1593 else if (!ref_newer(&ref->new_oid, &ref->old_oid))
1594 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1595 }
1596
1597 /*
1598 * "--force" will defeat any rejection implemented
1599 * by the rules above.
1600 */
1601 if (!force_ref_update)
1602 ref->status = reject_reason;
1603 else if (reject_reason)
1604 ref->forced_update = 1;
1605 }
1606 }
1607
1608 static void set_merge(struct branch *ret)
1609 {
1610 struct remote *remote;
1611 char *ref;
1612 struct object_id oid;
1613 int i;
1614
1615 if (!ret)
1616 return; /* no branch */
1617 if (ret->merge)
1618 return; /* already run */
1619 if (!ret->remote_name || !ret->merge_nr) {
1620 /*
1621 * no merge config; let's make sure we don't confuse callers
1622 * with a non-zero merge_nr but a NULL merge
1623 */
1624 ret->merge_nr = 0;
1625 return;
1626 }
1627
1628 remote = remote_get(ret->remote_name);
1629
1630 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1631 for (i = 0; i < ret->merge_nr; i++) {
1632 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1633 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1634 if (!remote_find_tracking(remote, ret->merge[i]) ||
1635 strcmp(ret->remote_name, "."))
1636 continue;
1637 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1638 oid.hash, &ref) == 1)
1639 ret->merge[i]->dst = ref;
1640 else
1641 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1642 }
1643 }
1644
1645 struct branch *branch_get(const char *name)
1646 {
1647 struct branch *ret;
1648
1649 read_config();
1650 if (!name || !*name || !strcmp(name, "HEAD"))
1651 ret = current_branch;
1652 else
1653 ret = make_branch(name, 0);
1654 set_merge(ret);
1655 return ret;
1656 }
1657
1658 int branch_has_merge_config(struct branch *branch)
1659 {
1660 return branch && !!branch->merge;
1661 }
1662
1663 int branch_merge_matches(struct branch *branch,
1664 int i,
1665 const char *refname)
1666 {
1667 if (!branch || i < 0 || i >= branch->merge_nr)
1668 return 0;
1669 return refname_match(branch->merge[i]->src, refname);
1670 }
1671
1672 __attribute((format (printf,2,3)))
1673 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1674 {
1675 if (err) {
1676 va_list ap;
1677 va_start(ap, fmt);
1678 strbuf_vaddf(err, fmt, ap);
1679 va_end(ap);
1680 }
1681 return NULL;
1682 }
1683
1684 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1685 {
1686 if (!branch)
1687 return error_buf(err, _("HEAD does not point to a branch"));
1688
1689 if (!branch->merge || !branch->merge[0]) {
1690 /*
1691 * no merge config; is it because the user didn't define any,
1692 * or because it is not a real branch, and get_branch
1693 * auto-vivified it?
1694 */
1695 if (!ref_exists(branch->refname))
1696 return error_buf(err, _("no such branch: '%s'"),
1697 branch->name);
1698 return error_buf(err,
1699 _("no upstream configured for branch '%s'"),
1700 branch->name);
1701 }
1702
1703 if (!branch->merge[0]->dst)
1704 return error_buf(err,
1705 _("upstream branch '%s' not stored as a remote-tracking branch"),
1706 branch->merge[0]->src);
1707
1708 return branch->merge[0]->dst;
1709 }
1710
1711 static const char *tracking_for_push_dest(struct remote *remote,
1712 const char *refname,
1713 struct strbuf *err)
1714 {
1715 char *ret;
1716
1717 ret = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
1718 if (!ret)
1719 return error_buf(err,
1720 _("push destination '%s' on remote '%s' has no local tracking branch"),
1721 refname, remote->name);
1722 return ret;
1723 }
1724
1725 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1726 {
1727 struct remote *remote;
1728
1729 if (!branch)
1730 return error_buf(err, _("HEAD does not point to a branch"));
1731
1732 remote = remote_get(pushremote_for_branch(branch, NULL));
1733 if (!remote)
1734 return error_buf(err,
1735 _("branch '%s' has no remote for pushing"),
1736 branch->name);
1737
1738 if (remote->push_refspec_nr) {
1739 char *dst;
1740 const char *ret;
1741
1742 dst = apply_refspecs(remote->push, remote->push_refspec_nr,
1743 branch->refname);
1744 if (!dst)
1745 return error_buf(err,
1746 _("push refspecs for '%s' do not include '%s'"),
1747 remote->name, branch->name);
1748
1749 ret = tracking_for_push_dest(remote, dst, err);
1750 free(dst);
1751 return ret;
1752 }
1753
1754 if (remote->mirror)
1755 return tracking_for_push_dest(remote, branch->refname, err);
1756
1757 switch (push_default) {
1758 case PUSH_DEFAULT_NOTHING:
1759 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1760
1761 case PUSH_DEFAULT_MATCHING:
1762 case PUSH_DEFAULT_CURRENT:
1763 return tracking_for_push_dest(remote, branch->refname, err);
1764
1765 case PUSH_DEFAULT_UPSTREAM:
1766 return branch_get_upstream(branch, err);
1767
1768 case PUSH_DEFAULT_UNSPECIFIED:
1769 case PUSH_DEFAULT_SIMPLE:
1770 {
1771 const char *up, *cur;
1772
1773 up = branch_get_upstream(branch, err);
1774 if (!up)
1775 return NULL;
1776 cur = tracking_for_push_dest(remote, branch->refname, err);
1777 if (!cur)
1778 return NULL;
1779 if (strcmp(cur, up))
1780 return error_buf(err,
1781 _("cannot resolve 'simple' push to a single destination"));
1782 return cur;
1783 }
1784 }
1785
1786 die("BUG: unhandled push situation");
1787 }
1788
1789 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1790 {
1791 if (!branch->push_tracking_ref)
1792 branch->push_tracking_ref = branch_get_push_1(branch, err);
1793 return branch->push_tracking_ref;
1794 }
1795
1796 static int ignore_symref_update(const char *refname)
1797 {
1798 struct object_id oid;
1799 int flag;
1800
1801 if (!resolve_ref_unsafe(refname, 0, oid.hash, &flag))
1802 return 0; /* non-existing refs are OK */
1803 return (flag & REF_ISSYMREF);
1804 }
1805
1806 /*
1807 * Create and return a list of (struct ref) consisting of copies of
1808 * each remote_ref that matches refspec. refspec must be a pattern.
1809 * Fill in the copies' peer_ref to describe the local tracking refs to
1810 * which they map. Omit any references that would map to an existing
1811 * local symbolic ref.
1812 */
1813 static struct ref *get_expanded_map(const struct ref *remote_refs,
1814 const struct refspec *refspec)
1815 {
1816 const struct ref *ref;
1817 struct ref *ret = NULL;
1818 struct ref **tail = &ret;
1819
1820 for (ref = remote_refs; ref; ref = ref->next) {
1821 char *expn_name = NULL;
1822
1823 if (strchr(ref->name, '^'))
1824 continue; /* a dereference item */
1825 if (match_name_with_pattern(refspec->src, ref->name,
1826 refspec->dst, &expn_name) &&
1827 !ignore_symref_update(expn_name)) {
1828 struct ref *cpy = copy_ref(ref);
1829
1830 cpy->peer_ref = alloc_ref(expn_name);
1831 if (refspec->force)
1832 cpy->peer_ref->force = 1;
1833 *tail = cpy;
1834 tail = &cpy->next;
1835 }
1836 free(expn_name);
1837 }
1838
1839 return ret;
1840 }
1841
1842 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1843 {
1844 const struct ref *ref;
1845 for (ref = refs; ref; ref = ref->next) {
1846 if (refname_match(name, ref->name))
1847 return ref;
1848 }
1849 return NULL;
1850 }
1851
1852 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1853 {
1854 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1855
1856 if (!ref)
1857 return NULL;
1858
1859 return copy_ref(ref);
1860 }
1861
1862 static struct ref *get_local_ref(const char *name)
1863 {
1864 if (!name || name[0] == '\0')
1865 return NULL;
1866
1867 if (starts_with(name, "refs/"))
1868 return alloc_ref(name);
1869
1870 if (starts_with(name, "heads/") ||
1871 starts_with(name, "tags/") ||
1872 starts_with(name, "remotes/"))
1873 return alloc_ref_with_prefix("refs/", 5, name);
1874
1875 return alloc_ref_with_prefix("refs/heads/", 11, name);
1876 }
1877
1878 int get_fetch_map(const struct ref *remote_refs,
1879 const struct refspec *refspec,
1880 struct ref ***tail,
1881 int missing_ok)
1882 {
1883 struct ref *ref_map, **rmp;
1884
1885 if (refspec->pattern) {
1886 ref_map = get_expanded_map(remote_refs, refspec);
1887 } else {
1888 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1889
1890 if (refspec->exact_sha1) {
1891 ref_map = alloc_ref(name);
1892 get_oid_hex(name, &ref_map->old_oid);
1893 } else {
1894 ref_map = get_remote_ref(remote_refs, name);
1895 }
1896 if (!missing_ok && !ref_map)
1897 die("Couldn't find remote ref %s", name);
1898 if (ref_map) {
1899 ref_map->peer_ref = get_local_ref(refspec->dst);
1900 if (ref_map->peer_ref && refspec->force)
1901 ref_map->peer_ref->force = 1;
1902 }
1903 }
1904
1905 for (rmp = &ref_map; *rmp; ) {
1906 if ((*rmp)->peer_ref) {
1907 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1908 check_refname_format((*rmp)->peer_ref->name, 0)) {
1909 struct ref *ignore = *rmp;
1910 error("* Ignoring funny ref '%s' locally",
1911 (*rmp)->peer_ref->name);
1912 *rmp = (*rmp)->next;
1913 free(ignore->peer_ref);
1914 free(ignore);
1915 continue;
1916 }
1917 }
1918 rmp = &((*rmp)->next);
1919 }
1920
1921 if (ref_map)
1922 tail_link_ref(ref_map, tail);
1923
1924 return 0;
1925 }
1926
1927 int resolve_remote_symref(struct ref *ref, struct ref *list)
1928 {
1929 if (!ref->symref)
1930 return 0;
1931 for (; list; list = list->next)
1932 if (!strcmp(ref->symref, list->name)) {
1933 oidcpy(&ref->old_oid, &list->old_oid);
1934 return 0;
1935 }
1936 return 1;
1937 }
1938
1939 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1940 {
1941 while (list) {
1942 struct commit *commit = pop_commit(&list);
1943 commit->object.flags &= ~mark;
1944 }
1945 }
1946
1947 int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid)
1948 {
1949 struct object *o;
1950 struct commit *old, *new;
1951 struct commit_list *list, *used;
1952 int found = 0;
1953
1954 /*
1955 * Both new and old must be commit-ish and new is descendant of
1956 * old. Otherwise we require --force.
1957 */
1958 o = deref_tag(parse_object(old_oid->hash), NULL, 0);
1959 if (!o || o->type != OBJ_COMMIT)
1960 return 0;
1961 old = (struct commit *) o;
1962
1963 o = deref_tag(parse_object(new_oid->hash), NULL, 0);
1964 if (!o || o->type != OBJ_COMMIT)
1965 return 0;
1966 new = (struct commit *) o;
1967
1968 if (parse_commit(new) < 0)
1969 return 0;
1970
1971 used = list = NULL;
1972 commit_list_insert(new, &list);
1973 while (list) {
1974 new = pop_most_recent_commit(&list, TMP_MARK);
1975 commit_list_insert(new, &used);
1976 if (new == old) {
1977 found = 1;
1978 break;
1979 }
1980 }
1981 unmark_and_free(list, TMP_MARK);
1982 unmark_and_free(used, TMP_MARK);
1983 return found;
1984 }
1985
1986 /*
1987 * Compare a branch with its upstream, and save their differences (number
1988 * of commits) in *num_ours and *num_theirs. The name of the upstream branch
1989 * (or NULL if no upstream is defined) is returned via *upstream_name, if it
1990 * is not itself NULL.
1991 *
1992 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
1993 * upstream defined, or ref does not exist), 0 otherwise.
1994 */
1995 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
1996 const char **upstream_name)
1997 {
1998 struct object_id oid;
1999 struct commit *ours, *theirs;
2000 struct rev_info revs;
2001 const char *base;
2002 struct argv_array argv = ARGV_ARRAY_INIT;
2003
2004 /* Cannot stat unless we are marked to build on top of somebody else. */
2005 base = branch_get_upstream(branch, NULL);
2006 if (upstream_name)
2007 *upstream_name = base;
2008 if (!base)
2009 return -1;
2010
2011 /* Cannot stat if what we used to build on no longer exists */
2012 if (read_ref(base, oid.hash))
2013 return -1;
2014 theirs = lookup_commit_reference(oid.hash);
2015 if (!theirs)
2016 return -1;
2017
2018 if (read_ref(branch->refname, oid.hash))
2019 return -1;
2020 ours = lookup_commit_reference(oid.hash);
2021 if (!ours)
2022 return -1;
2023
2024 /* are we the same? */
2025 if (theirs == ours) {
2026 *num_theirs = *num_ours = 0;
2027 return 0;
2028 }
2029
2030 /* Run "rev-list --left-right ours...theirs" internally... */
2031 argv_array_push(&argv, ""); /* ignored */
2032 argv_array_push(&argv, "--left-right");
2033 argv_array_pushf(&argv, "%s...%s",
2034 oid_to_hex(&ours->object.oid),
2035 oid_to_hex(&theirs->object.oid));
2036 argv_array_push(&argv, "--");
2037
2038 init_revisions(&revs, NULL);
2039 setup_revisions(argv.argc, argv.argv, &revs, NULL);
2040 if (prepare_revision_walk(&revs))
2041 die("revision walk setup failed");
2042
2043 /* ... and count the commits on each side. */
2044 *num_ours = 0;
2045 *num_theirs = 0;
2046 while (1) {
2047 struct commit *c = get_revision(&revs);
2048 if (!c)
2049 break;
2050 if (c->object.flags & SYMMETRIC_LEFT)
2051 (*num_ours)++;
2052 else
2053 (*num_theirs)++;
2054 }
2055
2056 /* clear object flags smudged by the above traversal */
2057 clear_commit_marks(ours, ALL_REV_FLAGS);
2058 clear_commit_marks(theirs, ALL_REV_FLAGS);
2059
2060 argv_array_clear(&argv);
2061 return 0;
2062 }
2063
2064 /*
2065 * Return true when there is anything to report, otherwise false.
2066 */
2067 int format_tracking_info(struct branch *branch, struct strbuf *sb)
2068 {
2069 int ours, theirs;
2070 const char *full_base;
2071 char *base;
2072 int upstream_is_gone = 0;
2073
2074 if (stat_tracking_info(branch, &ours, &theirs, &full_base) < 0) {
2075 if (!full_base)
2076 return 0;
2077 upstream_is_gone = 1;
2078 }
2079
2080 base = shorten_unambiguous_ref(full_base, 0);
2081 if (upstream_is_gone) {
2082 strbuf_addf(sb,
2083 _("Your branch is based on '%s', but the upstream is gone.\n"),
2084 base);
2085 if (advice_status_hints)
2086 strbuf_addf(sb,
2087 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
2088 } else if (!ours && !theirs) {
2089 strbuf_addf(sb,
2090 _("Your branch is up-to-date with '%s'.\n"),
2091 base);
2092 } else if (!theirs) {
2093 strbuf_addf(sb,
2094 Q_("Your branch is ahead of '%s' by %d commit.\n",
2095 "Your branch is ahead of '%s' by %d commits.\n",
2096 ours),
2097 base, ours);
2098 if (advice_status_hints)
2099 strbuf_addf(sb,
2100 _(" (use \"git push\" to publish your local commits)\n"));
2101 } else if (!ours) {
2102 strbuf_addf(sb,
2103 Q_("Your branch is behind '%s' by %d commit, "
2104 "and can be fast-forwarded.\n",
2105 "Your branch is behind '%s' by %d commits, "
2106 "and can be fast-forwarded.\n",
2107 theirs),
2108 base, theirs);
2109 if (advice_status_hints)
2110 strbuf_addf(sb,
2111 _(" (use \"git pull\" to update your local branch)\n"));
2112 } else {
2113 strbuf_addf(sb,
2114 Q_("Your branch and '%s' have diverged,\n"
2115 "and have %d and %d different commit each, "
2116 "respectively.\n",
2117 "Your branch and '%s' have diverged,\n"
2118 "and have %d and %d different commits each, "
2119 "respectively.\n",
2120 theirs),
2121 base, ours, theirs);
2122 if (advice_status_hints)
2123 strbuf_addf(sb,
2124 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2125 }
2126 free(base);
2127 return 1;
2128 }
2129
2130 static int one_local_ref(const char *refname, const struct object_id *oid,
2131 int flag, void *cb_data)
2132 {
2133 struct ref ***local_tail = cb_data;
2134 struct ref *ref;
2135 int len;
2136
2137 /* we already know it starts with refs/ to get here */
2138 if (check_refname_format(refname + 5, 0))
2139 return 0;
2140
2141 len = strlen(refname) + 1;
2142 ref = xcalloc(1, sizeof(*ref) + len);
2143 oidcpy(&ref->new_oid, oid);
2144 memcpy(ref->name, refname, len);
2145 **local_tail = ref;
2146 *local_tail = &ref->next;
2147 return 0;
2148 }
2149
2150 struct ref *get_local_heads(void)
2151 {
2152 struct ref *local_refs = NULL, **local_tail = &local_refs;
2153
2154 for_each_ref(one_local_ref, &local_tail);
2155 return local_refs;
2156 }
2157
2158 struct ref *guess_remote_head(const struct ref *head,
2159 const struct ref *refs,
2160 int all)
2161 {
2162 const struct ref *r;
2163 struct ref *list = NULL;
2164 struct ref **tail = &list;
2165
2166 if (!head)
2167 return NULL;
2168
2169 /*
2170 * Some transports support directly peeking at
2171 * where HEAD points; if that is the case, then
2172 * we don't have to guess.
2173 */
2174 if (head->symref)
2175 return copy_ref(find_ref_by_name(refs, head->symref));
2176
2177 /* If refs/heads/master could be right, it is. */
2178 if (!all) {
2179 r = find_ref_by_name(refs, "refs/heads/master");
2180 if (r && !oidcmp(&r->old_oid, &head->old_oid))
2181 return copy_ref(r);
2182 }
2183
2184 /* Look for another ref that points there */
2185 for (r = refs; r; r = r->next) {
2186 if (r != head &&
2187 starts_with(r->name, "refs/heads/") &&
2188 !oidcmp(&r->old_oid, &head->old_oid)) {
2189 *tail = copy_ref(r);
2190 tail = &((*tail)->next);
2191 if (!all)
2192 break;
2193 }
2194 }
2195
2196 return list;
2197 }
2198
2199 struct stale_heads_info {
2200 struct string_list *ref_names;
2201 struct ref **stale_refs_tail;
2202 struct refspec *refs;
2203 int ref_count;
2204 };
2205
2206 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2207 int flags, void *cb_data)
2208 {
2209 struct stale_heads_info *info = cb_data;
2210 struct string_list matches = STRING_LIST_INIT_DUP;
2211 struct refspec query;
2212 int i, stale = 1;
2213 memset(&query, 0, sizeof(struct refspec));
2214 query.dst = (char *)refname;
2215
2216 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2217 if (matches.nr == 0)
2218 goto clean_exit; /* No matches */
2219
2220 /*
2221 * If we did find a suitable refspec and it's not a symref and
2222 * it's not in the list of refs that currently exist in that
2223 * remote, we consider it to be stale. In order to deal with
2224 * overlapping refspecs, we need to go over all of the
2225 * matching refs.
2226 */
2227 if (flags & REF_ISSYMREF)
2228 goto clean_exit;
2229
2230 for (i = 0; stale && i < matches.nr; i++)
2231 if (string_list_has_string(info->ref_names, matches.items[i].string))
2232 stale = 0;
2233
2234 if (stale) {
2235 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2236 oidcpy(&ref->new_oid, oid);
2237 }
2238
2239 clean_exit:
2240 string_list_clear(&matches, 0);
2241 return 0;
2242 }
2243
2244 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2245 {
2246 struct ref *ref, *stale_refs = NULL;
2247 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2248 struct stale_heads_info info;
2249
2250 info.ref_names = &ref_names;
2251 info.stale_refs_tail = &stale_refs;
2252 info.refs = refs;
2253 info.ref_count = ref_count;
2254 for (ref = fetch_map; ref; ref = ref->next)
2255 string_list_append(&ref_names, ref->name);
2256 string_list_sort(&ref_names);
2257 for_each_ref(get_stale_heads_cb, &info);
2258 string_list_clear(&ref_names, 0);
2259 return stale_refs;
2260 }
2261
2262 /*
2263 * Compare-and-swap
2264 */
2265 static void clear_cas_option(struct push_cas_option *cas)
2266 {
2267 int i;
2268
2269 for (i = 0; i < cas->nr; i++)
2270 free(cas->entry[i].refname);
2271 free(cas->entry);
2272 memset(cas, 0, sizeof(*cas));
2273 }
2274
2275 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2276 const char *refname,
2277 size_t refnamelen)
2278 {
2279 struct push_cas *entry;
2280 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2281 entry = &cas->entry[cas->nr++];
2282 memset(entry, 0, sizeof(*entry));
2283 entry->refname = xmemdupz(refname, refnamelen);
2284 return entry;
2285 }
2286
2287 int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2288 {
2289 const char *colon;
2290 struct push_cas *entry;
2291
2292 if (unset) {
2293 /* "--no-<option>" */
2294 clear_cas_option(cas);
2295 return 0;
2296 }
2297
2298 if (!arg) {
2299 /* just "--<option>" */
2300 cas->use_tracking_for_rest = 1;
2301 return 0;
2302 }
2303
2304 /* "--<option>=refname" or "--<option>=refname:value" */
2305 colon = strchrnul(arg, ':');
2306 entry = add_cas_entry(cas, arg, colon - arg);
2307 if (!*colon)
2308 entry->use_tracking = 1;
2309 else if (get_sha1(colon + 1, entry->expect))
2310 return error("cannot parse expected object name '%s'", colon + 1);
2311 return 0;
2312 }
2313
2314 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2315 {
2316 return parse_push_cas_option(opt->value, arg, unset);
2317 }
2318
2319 int is_empty_cas(const struct push_cas_option *cas)
2320 {
2321 return !cas->use_tracking_for_rest && !cas->nr;
2322 }
2323
2324 /*
2325 * Look at remote.fetch refspec and see if we have a remote
2326 * tracking branch for the refname there. Fill its current
2327 * value in sha1[].
2328 * If we cannot do so, return negative to signal an error.
2329 */
2330 static int remote_tracking(struct remote *remote, const char *refname,
2331 struct object_id *oid)
2332 {
2333 char *dst;
2334
2335 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2336 if (!dst)
2337 return -1; /* no tracking ref for refname at remote */
2338 if (read_ref(dst, oid->hash))
2339 return -1; /* we know what the tracking ref is but we cannot read it */
2340 return 0;
2341 }
2342
2343 static void apply_cas(struct push_cas_option *cas,
2344 struct remote *remote,
2345 struct ref *ref)
2346 {
2347 int i;
2348
2349 /* Find an explicit --<option>=<name>[:<value>] entry */
2350 for (i = 0; i < cas->nr; i++) {
2351 struct push_cas *entry = &cas->entry[i];
2352 if (!refname_match(entry->refname, ref->name))
2353 continue;
2354 ref->expect_old_sha1 = 1;
2355 if (!entry->use_tracking)
2356 hashcpy(ref->old_oid_expect.hash, cas->entry[i].expect);
2357 else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2358 ref->expect_old_no_trackback = 1;
2359 return;
2360 }
2361
2362 /* Are we using "--<option>" to cover all? */
2363 if (!cas->use_tracking_for_rest)
2364 return;
2365
2366 ref->expect_old_sha1 = 1;
2367 if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
2368 ref->expect_old_no_trackback = 1;
2369 }
2370
2371 void apply_push_cas(struct push_cas_option *cas,
2372 struct remote *remote,
2373 struct ref *remote_refs)
2374 {
2375 struct ref *ref;
2376 for (ref = remote_refs; ref; ref = ref->next)
2377 apply_cas(cas, remote, ref);
2378 }
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