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Git.pm: add comment pointing to t9000
[git/debian.git] / remote.c
blob26504b744786c65ea4d6e1e0abbf5c6409af5358
1 #include "cache.h"
2 #include "remote.h"
3 #include "refs.h"
4 #include "commit.h"
5 #include "diff.h"
6 #include "revision.h"
7 #include "dir.h"
8 #include "tag.h"
9 #include "string-list.h"
10 #include "mergesort.h"
11
12 enum map_direction { FROM_SRC, FROM_DST };
13
14 static struct refspec s_tag_refspec = {
15 0,
16 1,
17 0,
18 0,
19 "refs/tags/*",
20 "refs/tags/*"
21 };
22
23 const struct refspec *tag_refspec = &s_tag_refspec;
24
25 struct counted_string {
26 size_t len;
27 const char *s;
28 };
29 struct rewrite {
30 const char *base;
31 size_t baselen;
32 struct counted_string *instead_of;
33 int instead_of_nr;
34 int instead_of_alloc;
35 };
36 struct rewrites {
37 struct rewrite **rewrite;
38 int rewrite_alloc;
39 int rewrite_nr;
40 };
41
42 static struct remote **remotes;
43 static int remotes_alloc;
44 static int remotes_nr;
45 static struct hashmap remotes_hash;
46
47 static struct branch **branches;
48 static int branches_alloc;
49 static int branches_nr;
50
51 static struct branch *current_branch;
52 static const char *pushremote_name;
53
54 static struct rewrites rewrites;
55 static struct rewrites rewrites_push;
56
57 #define BUF_SIZE (2048)
58 static char buffer[BUF_SIZE];
59
60 static int valid_remote(const struct remote *remote)
61 {
62 return (!!remote->url) || (!!remote->foreign_vcs);
63 }
64
65 static const char *alias_url(const char *url, struct rewrites *r)
66 {
67 int i, j;
68 char *ret;
69 struct counted_string *longest;
70 int longest_i;
71
72 longest = NULL;
73 longest_i = -1;
74 for (i = 0; i < r->rewrite_nr; i++) {
75 if (!r->rewrite[i])
76 continue;
77 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
78 if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
79 (!longest ||
80 longest->len < r->rewrite[i]->instead_of[j].len)) {
81 longest = &(r->rewrite[i]->instead_of[j]);
82 longest_i = i;
83 }
84 }
85 }
86 if (!longest)
87 return url;
88
89 ret = xmalloc(r->rewrite[longest_i]->baselen +
90 (strlen(url) - longest->len) + 1);
91 strcpy(ret, r->rewrite[longest_i]->base);
92 strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
93 return ret;
94 }
95
96 static void add_push_refspec(struct remote *remote, const char *ref)
97 {
98 ALLOC_GROW(remote->push_refspec,
99 remote->push_refspec_nr + 1,
100 remote->push_refspec_alloc);
101 remote->push_refspec[remote->push_refspec_nr++] = ref;
102 }
103
104 static void add_fetch_refspec(struct remote *remote, const char *ref)
105 {
106 ALLOC_GROW(remote->fetch_refspec,
107 remote->fetch_refspec_nr + 1,
108 remote->fetch_refspec_alloc);
109 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
110 }
111
112 static void add_url(struct remote *remote, const char *url)
113 {
114 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
115 remote->url[remote->url_nr++] = url;
116 }
117
118 static void add_pushurl(struct remote *remote, const char *pushurl)
119 {
120 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
121 remote->pushurl[remote->pushurl_nr++] = pushurl;
122 }
123
124 static void add_pushurl_alias(struct remote *remote, const char *url)
125 {
126 const char *pushurl = alias_url(url, &rewrites_push);
127 if (pushurl != url)
128 add_pushurl(remote, pushurl);
129 }
130
131 static void add_url_alias(struct remote *remote, const char *url)
132 {
133 add_url(remote, alias_url(url, &rewrites));
134 add_pushurl_alias(remote, url);
135 }
136
137 struct remotes_hash_key {
138 const char *str;
139 int len;
140 };
141
142 static int remotes_hash_cmp(const struct remote *a, const struct remote *b, const struct remotes_hash_key *key)
143 {
144 if (key)
145 return strncmp(a->name, key->str, key->len) || a->name[key->len];
146 else
147 return strcmp(a->name, b->name);
148 }
149
150 static inline void init_remotes_hash(void)
151 {
152 if (!remotes_hash.cmpfn)
153 hashmap_init(&remotes_hash, (hashmap_cmp_fn)remotes_hash_cmp, 0);
154 }
155
156 static struct remote *make_remote(const char *name, int len)
157 {
158 struct remote *ret, *replaced;
159 struct remotes_hash_key lookup;
160 struct hashmap_entry lookup_entry;
161
162 if (!len)
163 len = strlen(name);
164
165 init_remotes_hash();
166 lookup.str = name;
167 lookup.len = len;
168 hashmap_entry_init(&lookup_entry, memhash(name, len));
169
170 if ((ret = hashmap_get(&remotes_hash, &lookup_entry, &lookup)) != NULL)
171 return ret;
172
173 ret = xcalloc(1, sizeof(struct remote));
174 ret->prune = -1; /* unspecified */
175 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
176 remotes[remotes_nr++] = ret;
177 ret->name = xstrndup(name, len);
178
179 hashmap_entry_init(ret, lookup_entry.hash);
180 replaced = hashmap_put(&remotes_hash, ret);
181 assert(replaced == NULL); /* no previous entry overwritten */
182 return ret;
183 }
184
185 static void add_merge(struct branch *branch, const char *name)
186 {
187 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
188 branch->merge_alloc);
189 branch->merge_name[branch->merge_nr++] = name;
190 }
191
192 static struct branch *make_branch(const char *name, int len)
193 {
194 struct branch *ret;
195 int i;
196
197 for (i = 0; i < branches_nr; i++) {
198 if (len ? (!strncmp(name, branches[i]->name, len) &&
199 !branches[i]->name[len]) :
200 !strcmp(name, branches[i]->name))
201 return branches[i];
202 }
203
204 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
205 ret = xcalloc(1, sizeof(struct branch));
206 branches[branches_nr++] = ret;
207 if (len)
208 ret->name = xstrndup(name, len);
209 else
210 ret->name = xstrdup(name);
211 ret->refname = xstrfmt("refs/heads/%s", ret->name);
212
213 return ret;
214 }
215
216 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
217 {
218 struct rewrite *ret;
219 int i;
220
221 for (i = 0; i < r->rewrite_nr; i++) {
222 if (len
223 ? (len == r->rewrite[i]->baselen &&
224 !strncmp(base, r->rewrite[i]->base, len))
225 : !strcmp(base, r->rewrite[i]->base))
226 return r->rewrite[i];
227 }
228
229 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
230 ret = xcalloc(1, sizeof(struct rewrite));
231 r->rewrite[r->rewrite_nr++] = ret;
232 if (len) {
233 ret->base = xstrndup(base, len);
234 ret->baselen = len;
235 }
236 else {
237 ret->base = xstrdup(base);
238 ret->baselen = strlen(base);
239 }
240 return ret;
241 }
242
243 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
244 {
245 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
246 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
247 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
248 rewrite->instead_of_nr++;
249 }
250
251 static void read_remotes_file(struct remote *remote)
252 {
253 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
254
255 if (!f)
256 return;
257 remote->origin = REMOTE_REMOTES;
258 while (fgets(buffer, BUF_SIZE, f)) {
259 int value_list;
260 char *s, *p;
261
262 if (starts_with(buffer, "URL:")) {
263 value_list = 0;
264 s = buffer + 4;
265 } else if (starts_with(buffer, "Push:")) {
266 value_list = 1;
267 s = buffer + 5;
268 } else if (starts_with(buffer, "Pull:")) {
269 value_list = 2;
270 s = buffer + 5;
271 } else
272 continue;
273
274 while (isspace(*s))
275 s++;
276 if (!*s)
277 continue;
278
279 p = s + strlen(s);
280 while (isspace(p[-1]))
281 *--p = 0;
282
283 switch (value_list) {
284 case 0:
285 add_url_alias(remote, xstrdup(s));
286 break;
287 case 1:
288 add_push_refspec(remote, xstrdup(s));
289 break;
290 case 2:
291 add_fetch_refspec(remote, xstrdup(s));
292 break;
293 }
294 }
295 fclose(f);
296 }
297
298 static void read_branches_file(struct remote *remote)
299 {
300 char *frag;
301 struct strbuf branch = STRBUF_INIT;
302 int n = 1000;
303 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
304 char *s, *p;
305 int len;
306
307 if (!f)
308 return;
309 s = fgets(buffer, BUF_SIZE, f);
310 fclose(f);
311 if (!s)
312 return;
313 while (isspace(*s))
314 s++;
315 if (!*s)
316 return;
317 remote->origin = REMOTE_BRANCHES;
318 p = s + strlen(s);
319 while (isspace(p[-1]))
320 *--p = 0;
321 len = p - s;
322 p = xmalloc(len + 1);
323 strcpy(p, s);
324
325 /*
326 * The branches file would have URL and optionally
327 * #branch specified. The "master" (or specified) branch is
328 * fetched and stored in the local branch of the same name.
329 */
330 frag = strchr(p, '#');
331 if (frag) {
332 *(frag++) = '\0';
333 strbuf_addf(&branch, "refs/heads/%s", frag);
334 } else
335 strbuf_addstr(&branch, "refs/heads/master");
336
337 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
338 add_url_alias(remote, p);
339 add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
340 /*
341 * Cogito compatible push: push current HEAD to remote #branch
342 * (master if missing)
343 */
344 strbuf_init(&branch, 0);
345 strbuf_addstr(&branch, "HEAD");
346 if (frag)
347 strbuf_addf(&branch, ":refs/heads/%s", frag);
348 else
349 strbuf_addstr(&branch, ":refs/heads/master");
350 add_push_refspec(remote, strbuf_detach(&branch, NULL));
351 remote->fetch_tags = 1; /* always auto-follow */
352 }
353
354 static int handle_config(const char *key, const char *value, void *cb)
355 {
356 const char *name;
357 const char *subkey;
358 struct remote *remote;
359 struct branch *branch;
360 if (starts_with(key, "branch.")) {
361 name = key + 7;
362 subkey = strrchr(name, '.');
363 if (!subkey)
364 return 0;
365 branch = make_branch(name, subkey - name);
366 if (!strcmp(subkey, ".remote")) {
367 return git_config_string(&branch->remote_name, key, value);
368 } else if (!strcmp(subkey, ".pushremote")) {
369 return git_config_string(&branch->pushremote_name, key, value);
370 } else if (!strcmp(subkey, ".merge")) {
371 if (!value)
372 return config_error_nonbool(key);
373 add_merge(branch, xstrdup(value));
374 }
375 return 0;
376 }
377 if (starts_with(key, "url.")) {
378 struct rewrite *rewrite;
379 name = key + 4;
380 subkey = strrchr(name, '.');
381 if (!subkey)
382 return 0;
383 if (!strcmp(subkey, ".insteadof")) {
384 rewrite = make_rewrite(&rewrites, name, subkey - name);
385 if (!value)
386 return config_error_nonbool(key);
387 add_instead_of(rewrite, xstrdup(value));
388 } else if (!strcmp(subkey, ".pushinsteadof")) {
389 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
390 if (!value)
391 return config_error_nonbool(key);
392 add_instead_of(rewrite, xstrdup(value));
393 }
394 }
395
396 if (!starts_with(key, "remote."))
397 return 0;
398 name = key + 7;
399
400 /* Handle remote.* variables */
401 if (!strcmp(name, "pushdefault"))
402 return git_config_string(&pushremote_name, key, value);
403
404 /* Handle remote.<name>.* variables */
405 if (*name == '/') {
406 warning("Config remote shorthand cannot begin with '/': %s",
407 name);
408 return 0;
409 }
410 subkey = strrchr(name, '.');
411 if (!subkey)
412 return 0;
413 remote = make_remote(name, subkey - name);
414 remote->origin = REMOTE_CONFIG;
415 if (!strcmp(subkey, ".mirror"))
416 remote->mirror = git_config_bool(key, value);
417 else if (!strcmp(subkey, ".skipdefaultupdate"))
418 remote->skip_default_update = git_config_bool(key, value);
419 else if (!strcmp(subkey, ".skipfetchall"))
420 remote->skip_default_update = git_config_bool(key, value);
421 else if (!strcmp(subkey, ".prune"))
422 remote->prune = git_config_bool(key, value);
423 else if (!strcmp(subkey, ".url")) {
424 const char *v;
425 if (git_config_string(&v, key, value))
426 return -1;
427 add_url(remote, v);
428 } else if (!strcmp(subkey, ".pushurl")) {
429 const char *v;
430 if (git_config_string(&v, key, value))
431 return -1;
432 add_pushurl(remote, v);
433 } else if (!strcmp(subkey, ".push")) {
434 const char *v;
435 if (git_config_string(&v, key, value))
436 return -1;
437 add_push_refspec(remote, v);
438 } else if (!strcmp(subkey, ".fetch")) {
439 const char *v;
440 if (git_config_string(&v, key, value))
441 return -1;
442 add_fetch_refspec(remote, v);
443 } else if (!strcmp(subkey, ".receivepack")) {
444 const char *v;
445 if (git_config_string(&v, key, value))
446 return -1;
447 if (!remote->receivepack)
448 remote->receivepack = v;
449 else
450 error("more than one receivepack given, using the first");
451 } else if (!strcmp(subkey, ".uploadpack")) {
452 const char *v;
453 if (git_config_string(&v, key, value))
454 return -1;
455 if (!remote->uploadpack)
456 remote->uploadpack = v;
457 else
458 error("more than one uploadpack given, using the first");
459 } else if (!strcmp(subkey, ".tagopt")) {
460 if (!strcmp(value, "--no-tags"))
461 remote->fetch_tags = -1;
462 else if (!strcmp(value, "--tags"))
463 remote->fetch_tags = 2;
464 } else if (!strcmp(subkey, ".proxy")) {
465 return git_config_string((const char **)&remote->http_proxy,
466 key, value);
467 } else if (!strcmp(subkey, ".vcs")) {
468 return git_config_string(&remote->foreign_vcs, key, value);
469 }
470 return 0;
471 }
472
473 static void alias_all_urls(void)
474 {
475 int i, j;
476 for (i = 0; i < remotes_nr; i++) {
477 int add_pushurl_aliases;
478 if (!remotes[i])
479 continue;
480 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
481 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
482 }
483 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
484 for (j = 0; j < remotes[i]->url_nr; j++) {
485 if (add_pushurl_aliases)
486 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
487 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
488 }
489 }
490 }
491
492 static void read_config(void)
493 {
494 static int loaded;
495 unsigned char sha1[20];
496 const char *head_ref;
497 int flag;
498
499 if (loaded)
500 return;
501 loaded = 1;
502
503 current_branch = NULL;
504 head_ref = resolve_ref_unsafe("HEAD", 0, sha1, &flag);
505 if (head_ref && (flag & REF_ISSYMREF) &&
506 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
507 current_branch = make_branch(head_ref, 0);
508 }
509 git_config(handle_config, NULL);
510 alias_all_urls();
511 }
512
513 /*
514 * This function frees a refspec array.
515 * Warning: code paths should be checked to ensure that the src
516 * and dst pointers are always freeable pointers as well
517 * as the refspec pointer itself.
518 */
519 static void free_refspecs(struct refspec *refspec, int nr_refspec)
520 {
521 int i;
522
523 if (!refspec)
524 return;
525
526 for (i = 0; i < nr_refspec; i++) {
527 free(refspec[i].src);
528 free(refspec[i].dst);
529 }
530 free(refspec);
531 }
532
533 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
534 {
535 int i;
536 struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
537
538 for (i = 0; i < nr_refspec; i++) {
539 size_t llen;
540 int is_glob;
541 const char *lhs, *rhs;
542 int flags;
543
544 is_glob = 0;
545
546 lhs = refspec[i];
547 if (*lhs == '+') {
548 rs[i].force = 1;
549 lhs++;
550 }
551
552 rhs = strrchr(lhs, ':');
553
554 /*
555 * Before going on, special case ":" (or "+:") as a refspec
556 * for pushing matching refs.
557 */
558 if (!fetch && rhs == lhs && rhs[1] == '\0') {
559 rs[i].matching = 1;
560 continue;
561 }
562
563 if (rhs) {
564 size_t rlen = strlen(++rhs);
565 is_glob = (1 <= rlen && strchr(rhs, '*'));
566 rs[i].dst = xstrndup(rhs, rlen);
567 }
568
569 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
570 if (1 <= llen && memchr(lhs, '*', llen)) {
571 if ((rhs && !is_glob) || (!rhs && fetch))
572 goto invalid;
573 is_glob = 1;
574 } else if (rhs && is_glob) {
575 goto invalid;
576 }
577
578 rs[i].pattern = is_glob;
579 rs[i].src = xstrndup(lhs, llen);
580 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
581
582 if (fetch) {
583 unsigned char unused[40];
584
585 /* LHS */
586 if (!*rs[i].src)
587 ; /* empty is ok; it means "HEAD" */
588 else if (llen == 40 && !get_sha1_hex(rs[i].src, unused))
589 rs[i].exact_sha1 = 1; /* ok */
590 else if (!check_refname_format(rs[i].src, flags))
591 ; /* valid looking ref is ok */
592 else
593 goto invalid;
594 /* RHS */
595 if (!rs[i].dst)
596 ; /* missing is ok; it is the same as empty */
597 else if (!*rs[i].dst)
598 ; /* empty is ok; it means "do not store" */
599 else if (!check_refname_format(rs[i].dst, flags))
600 ; /* valid looking ref is ok */
601 else
602 goto invalid;
603 } else {
604 /*
605 * LHS
606 * - empty is allowed; it means delete.
607 * - when wildcarded, it must be a valid looking ref.
608 * - otherwise, it must be an extended SHA-1, but
609 * there is no existing way to validate this.
610 */
611 if (!*rs[i].src)
612 ; /* empty is ok */
613 else if (is_glob) {
614 if (check_refname_format(rs[i].src, flags))
615 goto invalid;
616 }
617 else
618 ; /* anything goes, for now */
619 /*
620 * RHS
621 * - missing is allowed, but LHS then must be a
622 * valid looking ref.
623 * - empty is not allowed.
624 * - otherwise it must be a valid looking ref.
625 */
626 if (!rs[i].dst) {
627 if (check_refname_format(rs[i].src, flags))
628 goto invalid;
629 } else if (!*rs[i].dst) {
630 goto invalid;
631 } else {
632 if (check_refname_format(rs[i].dst, flags))
633 goto invalid;
634 }
635 }
636 }
637 return rs;
638
639 invalid:
640 if (verify) {
641 /*
642 * nr_refspec must be greater than zero and i must be valid
643 * since it is only possible to reach this point from within
644 * the for loop above.
645 */
646 free_refspecs(rs, i+1);
647 return NULL;
648 }
649 die("Invalid refspec '%s'", refspec[i]);
650 }
651
652 int valid_fetch_refspec(const char *fetch_refspec_str)
653 {
654 struct refspec *refspec;
655
656 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
657 free_refspecs(refspec, 1);
658 return !!refspec;
659 }
660
661 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
662 {
663 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
664 }
665
666 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
667 {
668 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
669 }
670
671 void free_refspec(int nr_refspec, struct refspec *refspec)
672 {
673 int i;
674 for (i = 0; i < nr_refspec; i++) {
675 free(refspec[i].src);
676 free(refspec[i].dst);
677 }
678 free(refspec);
679 }
680
681 static int valid_remote_nick(const char *name)
682 {
683 if (!name[0] || is_dot_or_dotdot(name))
684 return 0;
685 return !strchr(name, '/'); /* no slash */
686 }
687
688 const char *remote_for_branch(struct branch *branch, int *explicit)
689 {
690 if (branch && branch->remote_name) {
691 if (explicit)
692 *explicit = 1;
693 return branch->remote_name;
694 }
695 if (explicit)
696 *explicit = 0;
697 return "origin";
698 }
699
700 const char *pushremote_for_branch(struct branch *branch, int *explicit)
701 {
702 if (branch && branch->pushremote_name) {
703 if (explicit)
704 *explicit = 1;
705 return branch->pushremote_name;
706 }
707 if (pushremote_name) {
708 if (explicit)
709 *explicit = 1;
710 return pushremote_name;
711 }
712 return remote_for_branch(branch, explicit);
713 }
714
715 static struct remote *remote_get_1(const char *name,
716 const char *(*get_default)(struct branch *, int *))
717 {
718 struct remote *ret;
719 int name_given = 0;
720
721 read_config();
722
723 if (name)
724 name_given = 1;
725 else
726 name = get_default(current_branch, &name_given);
727
728 ret = make_remote(name, 0);
729 if (valid_remote_nick(name)) {
730 if (!valid_remote(ret))
731 read_remotes_file(ret);
732 if (!valid_remote(ret))
733 read_branches_file(ret);
734 }
735 if (name_given && !valid_remote(ret))
736 add_url_alias(ret, name);
737 if (!valid_remote(ret))
738 return NULL;
739 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
740 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
741 return ret;
742 }
743
744 struct remote *remote_get(const char *name)
745 {
746 return remote_get_1(name, remote_for_branch);
747 }
748
749 struct remote *pushremote_get(const char *name)
750 {
751 return remote_get_1(name, pushremote_for_branch);
752 }
753
754 int remote_is_configured(const char *name)
755 {
756 struct remotes_hash_key lookup;
757 struct hashmap_entry lookup_entry;
758 read_config();
759
760 init_remotes_hash();
761 lookup.str = name;
762 lookup.len = strlen(name);
763 hashmap_entry_init(&lookup_entry, memhash(name, lookup.len));
764
765 return hashmap_get(&remotes_hash, &lookup_entry, &lookup) != NULL;
766 }
767
768 int for_each_remote(each_remote_fn fn, void *priv)
769 {
770 int i, result = 0;
771 read_config();
772 for (i = 0; i < remotes_nr && !result; i++) {
773 struct remote *r = remotes[i];
774 if (!r)
775 continue;
776 if (!r->fetch)
777 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
778 r->fetch_refspec);
779 if (!r->push)
780 r->push = parse_push_refspec(r->push_refspec_nr,
781 r->push_refspec);
782 result = fn(r, priv);
783 }
784 return result;
785 }
786
787 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
788 {
789 if (strcmp(ref1->name, ref2->name)) {
790 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
791 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
792 die(_("Cannot fetch both %s and %s to %s"),
793 ref1->name, ref2->name, ref2->peer_ref->name);
794 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
795 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
796 warning(_("%s usually tracks %s, not %s"),
797 ref2->peer_ref->name, ref2->name, ref1->name);
798 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
799 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
800 die(_("%s tracks both %s and %s"),
801 ref2->peer_ref->name, ref1->name, ref2->name);
802 } else {
803 /*
804 * This last possibility doesn't occur because
805 * FETCH_HEAD_IGNORE entries always appear at
806 * the end of the list.
807 */
808 die(_("Internal error"));
809 }
810 }
811 free(ref2->peer_ref);
812 free(ref2);
813 }
814
815 struct ref *ref_remove_duplicates(struct ref *ref_map)
816 {
817 struct string_list refs = STRING_LIST_INIT_NODUP;
818 struct ref *retval = NULL;
819 struct ref **p = &retval;
820
821 while (ref_map) {
822 struct ref *ref = ref_map;
823
824 ref_map = ref_map->next;
825 ref->next = NULL;
826
827 if (!ref->peer_ref) {
828 *p = ref;
829 p = &ref->next;
830 } else {
831 struct string_list_item *item =
832 string_list_insert(&refs, ref->peer_ref->name);
833
834 if (item->util) {
835 /* Entry already existed */
836 handle_duplicate((struct ref *)item->util, ref);
837 } else {
838 *p = ref;
839 p = &ref->next;
840 item->util = ref;
841 }
842 }
843 }
844
845 string_list_clear(&refs, 0);
846 return retval;
847 }
848
849 int remote_has_url(struct remote *remote, const char *url)
850 {
851 int i;
852 for (i = 0; i < remote->url_nr; i++) {
853 if (!strcmp(remote->url[i], url))
854 return 1;
855 }
856 return 0;
857 }
858
859 static int match_name_with_pattern(const char *key, const char *name,
860 const char *value, char **result)
861 {
862 const char *kstar = strchr(key, '*');
863 size_t klen;
864 size_t ksuffixlen;
865 size_t namelen;
866 int ret;
867 if (!kstar)
868 die("Key '%s' of pattern had no '*'", key);
869 klen = kstar - key;
870 ksuffixlen = strlen(kstar + 1);
871 namelen = strlen(name);
872 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
873 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
874 if (ret && value) {
875 struct strbuf sb = STRBUF_INIT;
876 const char *vstar = strchr(value, '*');
877 if (!vstar)
878 die("Value '%s' of pattern has no '*'", value);
879 strbuf_add(&sb, value, vstar - value);
880 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
881 strbuf_addstr(&sb, vstar + 1);
882 *result = strbuf_detach(&sb, NULL);
883 }
884 return ret;
885 }
886
887 static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
888 {
889 int i;
890 int find_src = !query->src;
891
892 if (find_src && !query->dst)
893 error("query_refspecs_multiple: need either src or dst");
894
895 for (i = 0; i < ref_count; i++) {
896 struct refspec *refspec = &refs[i];
897 const char *key = find_src ? refspec->dst : refspec->src;
898 const char *value = find_src ? refspec->src : refspec->dst;
899 const char *needle = find_src ? query->dst : query->src;
900 char **result = find_src ? &query->src : &query->dst;
901
902 if (!refspec->dst)
903 continue;
904 if (refspec->pattern) {
905 if (match_name_with_pattern(key, needle, value, result))
906 string_list_append_nodup(results, *result);
907 } else if (!strcmp(needle, key)) {
908 string_list_append(results, value);
909 }
910 }
911 }
912
913 int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
914 {
915 int i;
916 int find_src = !query->src;
917 const char *needle = find_src ? query->dst : query->src;
918 char **result = find_src ? &query->src : &query->dst;
919
920 if (find_src && !query->dst)
921 return error("query_refspecs: need either src or dst");
922
923 for (i = 0; i < ref_count; i++) {
924 struct refspec *refspec = &refs[i];
925 const char *key = find_src ? refspec->dst : refspec->src;
926 const char *value = find_src ? refspec->src : refspec->dst;
927
928 if (!refspec->dst)
929 continue;
930 if (refspec->pattern) {
931 if (match_name_with_pattern(key, needle, value, result)) {
932 query->force = refspec->force;
933 return 0;
934 }
935 } else if (!strcmp(needle, key)) {
936 *result = xstrdup(value);
937 query->force = refspec->force;
938 return 0;
939 }
940 }
941 return -1;
942 }
943
944 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
945 const char *name)
946 {
947 struct refspec query;
948
949 memset(&query, 0, sizeof(struct refspec));
950 query.src = (char *)name;
951
952 if (query_refspecs(refspecs, nr_refspec, &query))
953 return NULL;
954
955 return query.dst;
956 }
957
958 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
959 {
960 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
961 }
962
963 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
964 const char *name)
965 {
966 size_t len = strlen(name);
967 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
968 memcpy(ref->name, prefix, prefixlen);
969 memcpy(ref->name + prefixlen, name, len);
970 return ref;
971 }
972
973 struct ref *alloc_ref(const char *name)
974 {
975 return alloc_ref_with_prefix("", 0, name);
976 }
977
978 struct ref *copy_ref(const struct ref *ref)
979 {
980 struct ref *cpy;
981 size_t len;
982 if (!ref)
983 return NULL;
984 len = strlen(ref->name);
985 cpy = xmalloc(sizeof(struct ref) + len + 1);
986 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
987 cpy->next = NULL;
988 cpy->symref = xstrdup_or_null(ref->symref);
989 cpy->remote_status = xstrdup_or_null(ref->remote_status);
990 cpy->peer_ref = copy_ref(ref->peer_ref);
991 return cpy;
992 }
993
994 struct ref *copy_ref_list(const struct ref *ref)
995 {
996 struct ref *ret = NULL;
997 struct ref **tail = &ret;
998 while (ref) {
999 *tail = copy_ref(ref);
1000 ref = ref->next;
1001 tail = &((*tail)->next);
1002 }
1003 return ret;
1004 }
1005
1006 static void free_ref(struct ref *ref)
1007 {
1008 if (!ref)
1009 return;
1010 free_ref(ref->peer_ref);
1011 free(ref->remote_status);
1012 free(ref->symref);
1013 free(ref);
1014 }
1015
1016 void free_refs(struct ref *ref)
1017 {
1018 struct ref *next;
1019 while (ref) {
1020 next = ref->next;
1021 free_ref(ref);
1022 ref = next;
1023 }
1024 }
1025
1026 int ref_compare_name(const void *va, const void *vb)
1027 {
1028 const struct ref *a = va, *b = vb;
1029 return strcmp(a->name, b->name);
1030 }
1031
1032 static void *ref_list_get_next(const void *a)
1033 {
1034 return ((const struct ref *)a)->next;
1035 }
1036
1037 static void ref_list_set_next(void *a, void *next)
1038 {
1039 ((struct ref *)a)->next = next;
1040 }
1041
1042 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
1043 {
1044 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
1045 }
1046
1047 int count_refspec_match(const char *pattern,
1048 struct ref *refs,
1049 struct ref **matched_ref)
1050 {
1051 int patlen = strlen(pattern);
1052 struct ref *matched_weak = NULL;
1053 struct ref *matched = NULL;
1054 int weak_match = 0;
1055 int match = 0;
1056
1057 for (weak_match = match = 0; refs; refs = refs->next) {
1058 char *name = refs->name;
1059 int namelen = strlen(name);
1060
1061 if (!refname_match(pattern, name))
1062 continue;
1063
1064 /* A match is "weak" if it is with refs outside
1065 * heads or tags, and did not specify the pattern
1066 * in full (e.g. "refs/remotes/origin/master") or at
1067 * least from the toplevel (e.g. "remotes/origin/master");
1068 * otherwise "git push $URL master" would result in
1069 * ambiguity between remotes/origin/master and heads/master
1070 * at the remote site.
1071 */
1072 if (namelen != patlen &&
1073 patlen != namelen - 5 &&
1074 !starts_with(name, "refs/heads/") &&
1075 !starts_with(name, "refs/tags/")) {
1076 /* We want to catch the case where only weak
1077 * matches are found and there are multiple
1078 * matches, and where more than one strong
1079 * matches are found, as ambiguous. One
1080 * strong match with zero or more weak matches
1081 * are acceptable as a unique match.
1082 */
1083 matched_weak = refs;
1084 weak_match++;
1085 }
1086 else {
1087 matched = refs;
1088 match++;
1089 }
1090 }
1091 if (!matched) {
1092 if (matched_ref)
1093 *matched_ref = matched_weak;
1094 return weak_match;
1095 }
1096 else {
1097 if (matched_ref)
1098 *matched_ref = matched;
1099 return match;
1100 }
1101 }
1102
1103 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1104 {
1105 **tail = ref;
1106 while (ref->next)
1107 ref = ref->next;
1108 *tail = &ref->next;
1109 }
1110
1111 static struct ref *alloc_delete_ref(void)
1112 {
1113 struct ref *ref = alloc_ref("(delete)");
1114 hashclr(ref->new_sha1);
1115 return ref;
1116 }
1117
1118 static int try_explicit_object_name(const char *name,
1119 struct ref **match)
1120 {
1121 unsigned char sha1[20];
1122
1123 if (!*name) {
1124 if (match)
1125 *match = alloc_delete_ref();
1126 return 0;
1127 }
1128
1129 if (get_sha1(name, sha1))
1130 return -1;
1131
1132 if (match) {
1133 *match = alloc_ref(name);
1134 hashcpy((*match)->new_sha1, sha1);
1135 }
1136 return 0;
1137 }
1138
1139 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1140 {
1141 struct ref *ret = alloc_ref(name);
1142 tail_link_ref(ret, tail);
1143 return ret;
1144 }
1145
1146 static char *guess_ref(const char *name, struct ref *peer)
1147 {
1148 struct strbuf buf = STRBUF_INIT;
1149 unsigned char sha1[20];
1150
1151 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1152 sha1, NULL);
1153 if (!r)
1154 return NULL;
1155
1156 if (starts_with(r, "refs/heads/"))
1157 strbuf_addstr(&buf, "refs/heads/");
1158 else if (starts_with(r, "refs/tags/"))
1159 strbuf_addstr(&buf, "refs/tags/");
1160 else
1161 return NULL;
1162
1163 strbuf_addstr(&buf, name);
1164 return strbuf_detach(&buf, NULL);
1165 }
1166
1167 static int match_explicit_lhs(struct ref *src,
1168 struct refspec *rs,
1169 struct ref **match,
1170 int *allocated_match)
1171 {
1172 switch (count_refspec_match(rs->src, src, match)) {
1173 case 1:
1174 if (allocated_match)
1175 *allocated_match = 0;
1176 return 0;
1177 case 0:
1178 /* The source could be in the get_sha1() format
1179 * not a reference name. :refs/other is a
1180 * way to delete 'other' ref at the remote end.
1181 */
1182 if (try_explicit_object_name(rs->src, match) < 0)
1183 return error("src refspec %s does not match any.", rs->src);
1184 if (allocated_match)
1185 *allocated_match = 1;
1186 return 0;
1187 default:
1188 return error("src refspec %s matches more than one.", rs->src);
1189 }
1190 }
1191
1192 static int match_explicit(struct ref *src, struct ref *dst,
1193 struct ref ***dst_tail,
1194 struct refspec *rs)
1195 {
1196 struct ref *matched_src, *matched_dst;
1197 int allocated_src;
1198
1199 const char *dst_value = rs->dst;
1200 char *dst_guess;
1201
1202 if (rs->pattern || rs->matching)
1203 return 0;
1204
1205 matched_src = matched_dst = NULL;
1206 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1207 return -1;
1208
1209 if (!dst_value) {
1210 unsigned char sha1[20];
1211 int flag;
1212
1213 dst_value = resolve_ref_unsafe(matched_src->name,
1214 RESOLVE_REF_READING,
1215 sha1, &flag);
1216 if (!dst_value ||
1217 ((flag & REF_ISSYMREF) &&
1218 !starts_with(dst_value, "refs/heads/")))
1219 die("%s cannot be resolved to branch.",
1220 matched_src->name);
1221 }
1222
1223 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1224 case 1:
1225 break;
1226 case 0:
1227 if (starts_with(dst_value, "refs/"))
1228 matched_dst = make_linked_ref(dst_value, dst_tail);
1229 else if (is_null_sha1(matched_src->new_sha1))
1230 error("unable to delete '%s': remote ref does not exist",
1231 dst_value);
1232 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1233 matched_dst = make_linked_ref(dst_guess, dst_tail);
1234 else
1235 error("unable to push to unqualified destination: %s\n"
1236 "The destination refspec neither matches an "
1237 "existing ref on the remote nor\n"
1238 "begins with refs/, and we are unable to "
1239 "guess a prefix based on the source ref.",
1240 dst_value);
1241 break;
1242 default:
1243 matched_dst = NULL;
1244 error("dst refspec %s matches more than one.",
1245 dst_value);
1246 break;
1247 }
1248 if (!matched_dst)
1249 return -1;
1250 if (matched_dst->peer_ref)
1251 return error("dst ref %s receives from more than one src.",
1252 matched_dst->name);
1253 else {
1254 matched_dst->peer_ref = allocated_src ?
1255 matched_src :
1256 copy_ref(matched_src);
1257 matched_dst->force = rs->force;
1258 }
1259 return 0;
1260 }
1261
1262 static int match_explicit_refs(struct ref *src, struct ref *dst,
1263 struct ref ***dst_tail, struct refspec *rs,
1264 int rs_nr)
1265 {
1266 int i, errs;
1267 for (i = errs = 0; i < rs_nr; i++)
1268 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1269 return errs;
1270 }
1271
1272 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1273 int send_mirror, int direction, const struct refspec **ret_pat)
1274 {
1275 const struct refspec *pat;
1276 char *name;
1277 int i;
1278 int matching_refs = -1;
1279 for (i = 0; i < rs_nr; i++) {
1280 if (rs[i].matching &&
1281 (matching_refs == -1 || rs[i].force)) {
1282 matching_refs = i;
1283 continue;
1284 }
1285
1286 if (rs[i].pattern) {
1287 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1288 int match;
1289 if (direction == FROM_SRC)
1290 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1291 else
1292 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1293 if (match) {
1294 matching_refs = i;
1295 break;
1296 }
1297 }
1298 }
1299 if (matching_refs == -1)
1300 return NULL;
1301
1302 pat = rs + matching_refs;
1303 if (pat->matching) {
1304 /*
1305 * "matching refs"; traditionally we pushed everything
1306 * including refs outside refs/heads/ hierarchy, but
1307 * that does not make much sense these days.
1308 */
1309 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1310 return NULL;
1311 name = xstrdup(ref->name);
1312 }
1313 if (ret_pat)
1314 *ret_pat = pat;
1315 return name;
1316 }
1317
1318 static struct ref **tail_ref(struct ref **head)
1319 {
1320 struct ref **tail = head;
1321 while (*tail)
1322 tail = &((*tail)->next);
1323 return tail;
1324 }
1325
1326 struct tips {
1327 struct commit **tip;
1328 int nr, alloc;
1329 };
1330
1331 static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1332 {
1333 struct commit *commit;
1334
1335 if (is_null_sha1(sha1))
1336 return;
1337 commit = lookup_commit_reference_gently(sha1, 1);
1338 if (!commit || (commit->object.flags & TMP_MARK))
1339 return;
1340 commit->object.flags |= TMP_MARK;
1341 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1342 tips->tip[tips->nr++] = commit;
1343 }
1344
1345 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1346 {
1347 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1348 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1349 struct string_list_item *item;
1350 struct ref *ref;
1351 struct tips sent_tips;
1352
1353 /*
1354 * Collect everything we know they would have at the end of
1355 * this push, and collect all tags they have.
1356 */
1357 memset(&sent_tips, 0, sizeof(sent_tips));
1358 for (ref = *dst; ref; ref = ref->next) {
1359 if (ref->peer_ref &&
1360 !is_null_sha1(ref->peer_ref->new_sha1))
1361 add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1362 else
1363 add_to_tips(&sent_tips, ref->old_sha1);
1364 if (starts_with(ref->name, "refs/tags/"))
1365 string_list_append(&dst_tag, ref->name);
1366 }
1367 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1368
1369 string_list_sort(&dst_tag);
1370
1371 /* Collect tags they do not have. */
1372 for (ref = src; ref; ref = ref->next) {
1373 if (!starts_with(ref->name, "refs/tags/"))
1374 continue; /* not a tag */
1375 if (string_list_has_string(&dst_tag, ref->name))
1376 continue; /* they already have it */
1377 if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1378 continue; /* be conservative */
1379 item = string_list_append(&src_tag, ref->name);
1380 item->util = ref;
1381 }
1382 string_list_clear(&dst_tag, 0);
1383
1384 /*
1385 * At this point, src_tag lists tags that are missing from
1386 * dst, and sent_tips lists the tips we are pushing or those
1387 * that we know they already have. An element in the src_tag
1388 * that is an ancestor of any of the sent_tips needs to be
1389 * sent to the other side.
1390 */
1391 if (sent_tips.nr) {
1392 for_each_string_list_item(item, &src_tag) {
1393 struct ref *ref = item->util;
1394 struct ref *dst_ref;
1395 struct commit *commit;
1396
1397 if (is_null_sha1(ref->new_sha1))
1398 continue;
1399 commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1400 if (!commit)
1401 /* not pushing a commit, which is not an error */
1402 continue;
1403
1404 /*
1405 * Is this tag, which they do not have, reachable from
1406 * any of the commits we are sending?
1407 */
1408 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1409 continue;
1410
1411 /* Add it in */
1412 dst_ref = make_linked_ref(ref->name, dst_tail);
1413 hashcpy(dst_ref->new_sha1, ref->new_sha1);
1414 dst_ref->peer_ref = copy_ref(ref);
1415 }
1416 }
1417 string_list_clear(&src_tag, 0);
1418 free(sent_tips.tip);
1419 }
1420
1421 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1422 {
1423 for ( ; list; list = list->next)
1424 if (!strcmp(list->name, name))
1425 return (struct ref *)list;
1426 return NULL;
1427 }
1428
1429 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1430 {
1431 for ( ; ref; ref = ref->next)
1432 string_list_append_nodup(ref_index, ref->name)->util = ref;
1433
1434 string_list_sort(ref_index);
1435 }
1436
1437 /*
1438 * Given only the set of local refs, sanity-check the set of push
1439 * refspecs. We can't catch all errors that match_push_refs would,
1440 * but we can catch some errors early before even talking to the
1441 * remote side.
1442 */
1443 int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1444 {
1445 struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1446 int ret = 0;
1447 int i;
1448
1449 for (i = 0; i < nr_refspec; i++) {
1450 struct refspec *rs = refspec + i;
1451
1452 if (rs->pattern || rs->matching)
1453 continue;
1454
1455 ret |= match_explicit_lhs(src, rs, NULL, NULL);
1456 }
1457
1458 free_refspec(nr_refspec, refspec);
1459 return ret;
1460 }
1461
1462 /*
1463 * Given the set of refs the local repository has, the set of refs the
1464 * remote repository has, and the refspec used for push, determine
1465 * what remote refs we will update and with what value by setting
1466 * peer_ref (which object is being pushed) and force (if the push is
1467 * forced) in elements of "dst". The function may add new elements to
1468 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1469 */
1470 int match_push_refs(struct ref *src, struct ref **dst,
1471 int nr_refspec, const char **refspec, int flags)
1472 {
1473 struct refspec *rs;
1474 int send_all = flags & MATCH_REFS_ALL;
1475 int send_mirror = flags & MATCH_REFS_MIRROR;
1476 int send_prune = flags & MATCH_REFS_PRUNE;
1477 int errs;
1478 static const char *default_refspec[] = { ":", NULL };
1479 struct ref *ref, **dst_tail = tail_ref(dst);
1480 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1481
1482 if (!nr_refspec) {
1483 nr_refspec = 1;
1484 refspec = default_refspec;
1485 }
1486 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1487 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1488
1489 /* pick the remainder */
1490 for (ref = src; ref; ref = ref->next) {
1491 struct string_list_item *dst_item;
1492 struct ref *dst_peer;
1493 const struct refspec *pat = NULL;
1494 char *dst_name;
1495
1496 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1497 if (!dst_name)
1498 continue;
1499
1500 if (!dst_ref_index.nr)
1501 prepare_ref_index(&dst_ref_index, *dst);
1502
1503 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1504 dst_peer = dst_item ? dst_item->util : NULL;
1505 if (dst_peer) {
1506 if (dst_peer->peer_ref)
1507 /* We're already sending something to this ref. */
1508 goto free_name;
1509 } else {
1510 if (pat->matching && !(send_all || send_mirror))
1511 /*
1512 * Remote doesn't have it, and we have no
1513 * explicit pattern, and we don't have
1514 * --all or --mirror.
1515 */
1516 goto free_name;
1517
1518 /* Create a new one and link it */
1519 dst_peer = make_linked_ref(dst_name, &dst_tail);
1520 hashcpy(dst_peer->new_sha1, ref->new_sha1);
1521 string_list_insert(&dst_ref_index,
1522 dst_peer->name)->util = dst_peer;
1523 }
1524 dst_peer->peer_ref = copy_ref(ref);
1525 dst_peer->force = pat->force;
1526 free_name:
1527 free(dst_name);
1528 }
1529
1530 string_list_clear(&dst_ref_index, 0);
1531
1532 if (flags & MATCH_REFS_FOLLOW_TAGS)
1533 add_missing_tags(src, dst, &dst_tail);
1534
1535 if (send_prune) {
1536 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1537 /* check for missing refs on the remote */
1538 for (ref = *dst; ref; ref = ref->next) {
1539 char *src_name;
1540
1541 if (ref->peer_ref)
1542 /* We're already sending something to this ref. */
1543 continue;
1544
1545 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1546 if (src_name) {
1547 if (!src_ref_index.nr)
1548 prepare_ref_index(&src_ref_index, src);
1549 if (!string_list_has_string(&src_ref_index,
1550 src_name))
1551 ref->peer_ref = alloc_delete_ref();
1552 free(src_name);
1553 }
1554 }
1555 string_list_clear(&src_ref_index, 0);
1556 }
1557 if (errs)
1558 return -1;
1559 return 0;
1560 }
1561
1562 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1563 int force_update)
1564 {
1565 struct ref *ref;
1566
1567 for (ref = remote_refs; ref; ref = ref->next) {
1568 int force_ref_update = ref->force || force_update;
1569 int reject_reason = 0;
1570
1571 if (ref->peer_ref)
1572 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1573 else if (!send_mirror)
1574 continue;
1575
1576 ref->deletion = is_null_sha1(ref->new_sha1);
1577 if (!ref->deletion &&
1578 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1579 ref->status = REF_STATUS_UPTODATE;
1580 continue;
1581 }
1582
1583 /*
1584 * Bypass the usual "must fast-forward" check but
1585 * replace it with a weaker "the old value must be
1586 * this value we observed". If the remote ref has
1587 * moved and is now different from what we expect,
1588 * reject any push.
1589 *
1590 * It also is an error if the user told us to check
1591 * with the remote-tracking branch to find the value
1592 * to expect, but we did not have such a tracking
1593 * branch.
1594 */
1595 if (ref->expect_old_sha1) {
1596 if (ref->expect_old_no_trackback ||
1597 hashcmp(ref->old_sha1, ref->old_sha1_expect))
1598 reject_reason = REF_STATUS_REJECT_STALE;
1599 }
1600
1601 /*
1602 * The usual "must fast-forward" rules.
1603 *
1604 * Decide whether an individual refspec A:B can be
1605 * pushed. The push will succeed if any of the
1606 * following are true:
1607 *
1608 * (1) the remote reference B does not exist
1609 *
1610 * (2) the remote reference B is being removed (i.e.,
1611 * pushing :B where no source is specified)
1612 *
1613 * (3) the destination is not under refs/tags/, and
1614 * if the old and new value is a commit, the new
1615 * is a descendant of the old.
1616 *
1617 * (4) it is forced using the +A:B notation, or by
1618 * passing the --force argument
1619 */
1620
1621 else if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
1622 if (starts_with(ref->name, "refs/tags/"))
1623 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1624 else if (!has_sha1_file(ref->old_sha1))
1625 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1626 else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1627 !lookup_commit_reference_gently(ref->new_sha1, 1))
1628 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1629 else if (!ref_newer(ref->new_sha1, ref->old_sha1))
1630 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1631 }
1632
1633 /*
1634 * "--force" will defeat any rejection implemented
1635 * by the rules above.
1636 */
1637 if (!force_ref_update)
1638 ref->status = reject_reason;
1639 else if (reject_reason)
1640 ref->forced_update = 1;
1641 }
1642 }
1643
1644 static void set_merge(struct branch *ret)
1645 {
1646 struct remote *remote;
1647 char *ref;
1648 unsigned char sha1[20];
1649 int i;
1650
1651 if (!ret)
1652 return; /* no branch */
1653 if (ret->merge)
1654 return; /* already run */
1655 if (!ret->remote_name || !ret->merge_nr) {
1656 /*
1657 * no merge config; let's make sure we don't confuse callers
1658 * with a non-zero merge_nr but a NULL merge
1659 */
1660 ret->merge_nr = 0;
1661 return;
1662 }
1663
1664 remote = remote_get(ret->remote_name);
1665
1666 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1667 for (i = 0; i < ret->merge_nr; i++) {
1668 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1669 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1670 if (!remote_find_tracking(remote, ret->merge[i]) ||
1671 strcmp(ret->remote_name, "."))
1672 continue;
1673 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1674 sha1, &ref) == 1)
1675 ret->merge[i]->dst = ref;
1676 else
1677 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1678 }
1679 }
1680
1681 struct branch *branch_get(const char *name)
1682 {
1683 struct branch *ret;
1684
1685 read_config();
1686 if (!name || !*name || !strcmp(name, "HEAD"))
1687 ret = current_branch;
1688 else
1689 ret = make_branch(name, 0);
1690 set_merge(ret);
1691 return ret;
1692 }
1693
1694 int branch_has_merge_config(struct branch *branch)
1695 {
1696 return branch && !!branch->merge;
1697 }
1698
1699 int branch_merge_matches(struct branch *branch,
1700 int i,
1701 const char *refname)
1702 {
1703 if (!branch || i < 0 || i >= branch->merge_nr)
1704 return 0;
1705 return refname_match(branch->merge[i]->src, refname);
1706 }
1707
1708 __attribute((format (printf,2,3)))
1709 static const char *error_buf(struct strbuf *err, const char *fmt, ...)
1710 {
1711 if (err) {
1712 va_list ap;
1713 va_start(ap, fmt);
1714 strbuf_vaddf(err, fmt, ap);
1715 va_end(ap);
1716 }
1717 return NULL;
1718 }
1719
1720 const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
1721 {
1722 if (!branch)
1723 return error_buf(err, _("HEAD does not point to a branch"));
1724
1725 if (!branch->merge || !branch->merge[0]) {
1726 /*
1727 * no merge config; is it because the user didn't define any,
1728 * or because it is not a real branch, and get_branch
1729 * auto-vivified it?
1730 */
1731 if (!ref_exists(branch->refname))
1732 return error_buf(err, _("no such branch: '%s'"),
1733 branch->name);
1734 return error_buf(err,
1735 _("no upstream configured for branch '%s'"),
1736 branch->name);
1737 }
1738
1739 if (!branch->merge[0]->dst)
1740 return error_buf(err,
1741 _("upstream branch '%s' not stored as a remote-tracking branch"),
1742 branch->merge[0]->src);
1743
1744 return branch->merge[0]->dst;
1745 }
1746
1747 static const char *tracking_for_push_dest(struct remote *remote,
1748 const char *refname,
1749 struct strbuf *err)
1750 {
1751 char *ret;
1752
1753 ret = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
1754 if (!ret)
1755 return error_buf(err,
1756 _("push destination '%s' on remote '%s' has no local tracking branch"),
1757 refname, remote->name);
1758 return ret;
1759 }
1760
1761 static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
1762 {
1763 struct remote *remote;
1764
1765 if (!branch)
1766 return error_buf(err, _("HEAD does not point to a branch"));
1767
1768 remote = remote_get(pushremote_for_branch(branch, NULL));
1769 if (!remote)
1770 return error_buf(err,
1771 _("branch '%s' has no remote for pushing"),
1772 branch->name);
1773
1774 if (remote->push_refspec_nr) {
1775 char *dst;
1776 const char *ret;
1777
1778 dst = apply_refspecs(remote->push, remote->push_refspec_nr,
1779 branch->refname);
1780 if (!dst)
1781 return error_buf(err,
1782 _("push refspecs for '%s' do not include '%s'"),
1783 remote->name, branch->name);
1784
1785 ret = tracking_for_push_dest(remote, dst, err);
1786 free(dst);
1787 return ret;
1788 }
1789
1790 if (remote->mirror)
1791 return tracking_for_push_dest(remote, branch->refname, err);
1792
1793 switch (push_default) {
1794 case PUSH_DEFAULT_NOTHING:
1795 return error_buf(err, _("push has no destination (push.default is 'nothing')"));
1796
1797 case PUSH_DEFAULT_MATCHING:
1798 case PUSH_DEFAULT_CURRENT:
1799 return tracking_for_push_dest(remote, branch->refname, err);
1800
1801 case PUSH_DEFAULT_UPSTREAM:
1802 return branch_get_upstream(branch, err);
1803
1804 case PUSH_DEFAULT_UNSPECIFIED:
1805 case PUSH_DEFAULT_SIMPLE:
1806 {
1807 const char *up, *cur;
1808
1809 up = branch_get_upstream(branch, err);
1810 if (!up)
1811 return NULL;
1812 cur = tracking_for_push_dest(remote, branch->refname, err);
1813 if (!cur)
1814 return NULL;
1815 if (strcmp(cur, up))
1816 return error_buf(err,
1817 _("cannot resolve 'simple' push to a single destination"));
1818 return cur;
1819 }
1820 }
1821
1822 die("BUG: unhandled push situation");
1823 }
1824
1825 const char *branch_get_push(struct branch *branch, struct strbuf *err)
1826 {
1827 if (!branch->push_tracking_ref)
1828 branch->push_tracking_ref = branch_get_push_1(branch, err);
1829 return branch->push_tracking_ref;
1830 }
1831
1832 static int ignore_symref_update(const char *refname)
1833 {
1834 unsigned char sha1[20];
1835 int flag;
1836
1837 if (!resolve_ref_unsafe(refname, 0, sha1, &flag))
1838 return 0; /* non-existing refs are OK */
1839 return (flag & REF_ISSYMREF);
1840 }
1841
1842 /*
1843 * Create and return a list of (struct ref) consisting of copies of
1844 * each remote_ref that matches refspec. refspec must be a pattern.
1845 * Fill in the copies' peer_ref to describe the local tracking refs to
1846 * which they map. Omit any references that would map to an existing
1847 * local symbolic ref.
1848 */
1849 static struct ref *get_expanded_map(const struct ref *remote_refs,
1850 const struct refspec *refspec)
1851 {
1852 const struct ref *ref;
1853 struct ref *ret = NULL;
1854 struct ref **tail = &ret;
1855
1856 for (ref = remote_refs; ref; ref = ref->next) {
1857 char *expn_name = NULL;
1858
1859 if (strchr(ref->name, '^'))
1860 continue; /* a dereference item */
1861 if (match_name_with_pattern(refspec->src, ref->name,
1862 refspec->dst, &expn_name) &&
1863 !ignore_symref_update(expn_name)) {
1864 struct ref *cpy = copy_ref(ref);
1865
1866 cpy->peer_ref = alloc_ref(expn_name);
1867 if (refspec->force)
1868 cpy->peer_ref->force = 1;
1869 *tail = cpy;
1870 tail = &cpy->next;
1871 }
1872 free(expn_name);
1873 }
1874
1875 return ret;
1876 }
1877
1878 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1879 {
1880 const struct ref *ref;
1881 for (ref = refs; ref; ref = ref->next) {
1882 if (refname_match(name, ref->name))
1883 return ref;
1884 }
1885 return NULL;
1886 }
1887
1888 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1889 {
1890 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1891
1892 if (!ref)
1893 return NULL;
1894
1895 return copy_ref(ref);
1896 }
1897
1898 static struct ref *get_local_ref(const char *name)
1899 {
1900 if (!name || name[0] == '\0')
1901 return NULL;
1902
1903 if (starts_with(name, "refs/"))
1904 return alloc_ref(name);
1905
1906 if (starts_with(name, "heads/") ||
1907 starts_with(name, "tags/") ||
1908 starts_with(name, "remotes/"))
1909 return alloc_ref_with_prefix("refs/", 5, name);
1910
1911 return alloc_ref_with_prefix("refs/heads/", 11, name);
1912 }
1913
1914 int get_fetch_map(const struct ref *remote_refs,
1915 const struct refspec *refspec,
1916 struct ref ***tail,
1917 int missing_ok)
1918 {
1919 struct ref *ref_map, **rmp;
1920
1921 if (refspec->pattern) {
1922 ref_map = get_expanded_map(remote_refs, refspec);
1923 } else {
1924 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1925
1926 if (refspec->exact_sha1) {
1927 ref_map = alloc_ref(name);
1928 get_sha1_hex(name, ref_map->old_sha1);
1929 } else {
1930 ref_map = get_remote_ref(remote_refs, name);
1931 }
1932 if (!missing_ok && !ref_map)
1933 die("Couldn't find remote ref %s", name);
1934 if (ref_map) {
1935 ref_map->peer_ref = get_local_ref(refspec->dst);
1936 if (ref_map->peer_ref && refspec->force)
1937 ref_map->peer_ref->force = 1;
1938 }
1939 }
1940
1941 for (rmp = &ref_map; *rmp; ) {
1942 if ((*rmp)->peer_ref) {
1943 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1944 check_refname_format((*rmp)->peer_ref->name, 0)) {
1945 struct ref *ignore = *rmp;
1946 error("* Ignoring funny ref '%s' locally",
1947 (*rmp)->peer_ref->name);
1948 *rmp = (*rmp)->next;
1949 free(ignore->peer_ref);
1950 free(ignore);
1951 continue;
1952 }
1953 }
1954 rmp = &((*rmp)->next);
1955 }
1956
1957 if (ref_map)
1958 tail_link_ref(ref_map, tail);
1959
1960 return 0;
1961 }
1962
1963 int resolve_remote_symref(struct ref *ref, struct ref *list)
1964 {
1965 if (!ref->symref)
1966 return 0;
1967 for (; list; list = list->next)
1968 if (!strcmp(ref->symref, list->name)) {
1969 hashcpy(ref->old_sha1, list->old_sha1);
1970 return 0;
1971 }
1972 return 1;
1973 }
1974
1975 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1976 {
1977 while (list) {
1978 struct commit_list *temp = list;
1979 temp->item->object.flags &= ~mark;
1980 list = temp->next;
1981 free(temp);
1982 }
1983 }
1984
1985 int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1986 {
1987 struct object *o;
1988 struct commit *old, *new;
1989 struct commit_list *list, *used;
1990 int found = 0;
1991
1992 /*
1993 * Both new and old must be commit-ish and new is descendant of
1994 * old. Otherwise we require --force.
1995 */
1996 o = deref_tag(parse_object(old_sha1), NULL, 0);
1997 if (!o || o->type != OBJ_COMMIT)
1998 return 0;
1999 old = (struct commit *) o;
2000
2001 o = deref_tag(parse_object(new_sha1), NULL, 0);
2002 if (!o || o->type != OBJ_COMMIT)
2003 return 0;
2004 new = (struct commit *) o;
2005
2006 if (parse_commit(new) < 0)
2007 return 0;
2008
2009 used = list = NULL;
2010 commit_list_insert(new, &list);
2011 while (list) {
2012 new = pop_most_recent_commit(&list, TMP_MARK);
2013 commit_list_insert(new, &used);
2014 if (new == old) {
2015 found = 1;
2016 break;
2017 }
2018 }
2019 unmark_and_free(list, TMP_MARK);
2020 unmark_and_free(used, TMP_MARK);
2021 return found;
2022 }
2023
2024 /*
2025 * Compare a branch with its upstream, and save their differences (number
2026 * of commits) in *num_ours and *num_theirs. The name of the upstream branch
2027 * (or NULL if no upstream is defined) is returned via *upstream_name, if it
2028 * is not itself NULL.
2029 *
2030 * Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
2031 * upstream defined, or ref does not exist), 0 otherwise.
2032 */
2033 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
2034 const char **upstream_name)
2035 {
2036 unsigned char sha1[20];
2037 struct commit *ours, *theirs;
2038 char symmetric[84];
2039 struct rev_info revs;
2040 const char *rev_argv[10], *base;
2041 int rev_argc;
2042
2043 /* Cannot stat unless we are marked to build on top of somebody else. */
2044 base = branch_get_upstream(branch, NULL);
2045 if (upstream_name)
2046 *upstream_name = base;
2047 if (!base)
2048 return -1;
2049
2050 /* Cannot stat if what we used to build on no longer exists */
2051 if (read_ref(base, sha1))
2052 return -1;
2053 theirs = lookup_commit_reference(sha1);
2054 if (!theirs)
2055 return -1;
2056
2057 if (read_ref(branch->refname, sha1))
2058 return -1;
2059 ours = lookup_commit_reference(sha1);
2060 if (!ours)
2061 return -1;
2062
2063 /* are we the same? */
2064 if (theirs == ours) {
2065 *num_theirs = *num_ours = 0;
2066 return 0;
2067 }
2068
2069 /* Run "rev-list --left-right ours...theirs" internally... */
2070 rev_argc = 0;
2071 rev_argv[rev_argc++] = NULL;
2072 rev_argv[rev_argc++] = "--left-right";
2073 rev_argv[rev_argc++] = symmetric;
2074 rev_argv[rev_argc++] = "--";
2075 rev_argv[rev_argc] = NULL;
2076
2077 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
2078 strcpy(symmetric + 40, "...");
2079 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
2080
2081 init_revisions(&revs, NULL);
2082 setup_revisions(rev_argc, rev_argv, &revs, NULL);
2083 if (prepare_revision_walk(&revs))
2084 die("revision walk setup failed");
2085
2086 /* ... and count the commits on each side. */
2087 *num_ours = 0;
2088 *num_theirs = 0;
2089 while (1) {
2090 struct commit *c = get_revision(&revs);
2091 if (!c)
2092 break;
2093 if (c->object.flags & SYMMETRIC_LEFT)
2094 (*num_ours)++;
2095 else
2096 (*num_theirs)++;
2097 }
2098
2099 /* clear object flags smudged by the above traversal */
2100 clear_commit_marks(ours, ALL_REV_FLAGS);
2101 clear_commit_marks(theirs, ALL_REV_FLAGS);
2102 return 0;
2103 }
2104
2105 /*
2106 * Return true when there is anything to report, otherwise false.
2107 */
2108 int format_tracking_info(struct branch *branch, struct strbuf *sb)
2109 {
2110 int ours, theirs;
2111 const char *full_base;
2112 char *base;
2113 int upstream_is_gone = 0;
2114
2115 if (stat_tracking_info(branch, &ours, &theirs, &full_base) < 0) {
2116 if (!full_base)
2117 return 0;
2118 upstream_is_gone = 1;
2119 }
2120
2121 base = shorten_unambiguous_ref(full_base, 0);
2122 if (upstream_is_gone) {
2123 strbuf_addf(sb,
2124 _("Your branch is based on '%s', but the upstream is gone.\n"),
2125 base);
2126 if (advice_status_hints)
2127 strbuf_addf(sb,
2128 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
2129 } else if (!ours && !theirs) {
2130 strbuf_addf(sb,
2131 _("Your branch is up-to-date with '%s'.\n"),
2132 base);
2133 } else if (!theirs) {
2134 strbuf_addf(sb,
2135 Q_("Your branch is ahead of '%s' by %d commit.\n",
2136 "Your branch is ahead of '%s' by %d commits.\n",
2137 ours),
2138 base, ours);
2139 if (advice_status_hints)
2140 strbuf_addf(sb,
2141 _(" (use \"git push\" to publish your local commits)\n"));
2142 } else if (!ours) {
2143 strbuf_addf(sb,
2144 Q_("Your branch is behind '%s' by %d commit, "
2145 "and can be fast-forwarded.\n",
2146 "Your branch is behind '%s' by %d commits, "
2147 "and can be fast-forwarded.\n",
2148 theirs),
2149 base, theirs);
2150 if (advice_status_hints)
2151 strbuf_addf(sb,
2152 _(" (use \"git pull\" to update your local branch)\n"));
2153 } else {
2154 strbuf_addf(sb,
2155 Q_("Your branch and '%s' have diverged,\n"
2156 "and have %d and %d different commit each, "
2157 "respectively.\n",
2158 "Your branch and '%s' have diverged,\n"
2159 "and have %d and %d different commits each, "
2160 "respectively.\n",
2161 theirs),
2162 base, ours, theirs);
2163 if (advice_status_hints)
2164 strbuf_addf(sb,
2165 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2166 }
2167 free(base);
2168 return 1;
2169 }
2170
2171 static int one_local_ref(const char *refname, const struct object_id *oid,
2172 int flag, void *cb_data)
2173 {
2174 struct ref ***local_tail = cb_data;
2175 struct ref *ref;
2176 int len;
2177
2178 /* we already know it starts with refs/ to get here */
2179 if (check_refname_format(refname + 5, 0))
2180 return 0;
2181
2182 len = strlen(refname) + 1;
2183 ref = xcalloc(1, sizeof(*ref) + len);
2184 hashcpy(ref->new_sha1, oid->hash);
2185 memcpy(ref->name, refname, len);
2186 **local_tail = ref;
2187 *local_tail = &ref->next;
2188 return 0;
2189 }
2190
2191 struct ref *get_local_heads(void)
2192 {
2193 struct ref *local_refs = NULL, **local_tail = &local_refs;
2194
2195 for_each_ref(one_local_ref, &local_tail);
2196 return local_refs;
2197 }
2198
2199 struct ref *guess_remote_head(const struct ref *head,
2200 const struct ref *refs,
2201 int all)
2202 {
2203 const struct ref *r;
2204 struct ref *list = NULL;
2205 struct ref **tail = &list;
2206
2207 if (!head)
2208 return NULL;
2209
2210 /*
2211 * Some transports support directly peeking at
2212 * where HEAD points; if that is the case, then
2213 * we don't have to guess.
2214 */
2215 if (head->symref)
2216 return copy_ref(find_ref_by_name(refs, head->symref));
2217
2218 /* If refs/heads/master could be right, it is. */
2219 if (!all) {
2220 r = find_ref_by_name(refs, "refs/heads/master");
2221 if (r && !hashcmp(r->old_sha1, head->old_sha1))
2222 return copy_ref(r);
2223 }
2224
2225 /* Look for another ref that points there */
2226 for (r = refs; r; r = r->next) {
2227 if (r != head &&
2228 starts_with(r->name, "refs/heads/") &&
2229 !hashcmp(r->old_sha1, head->old_sha1)) {
2230 *tail = copy_ref(r);
2231 tail = &((*tail)->next);
2232 if (!all)
2233 break;
2234 }
2235 }
2236
2237 return list;
2238 }
2239
2240 struct stale_heads_info {
2241 struct string_list *ref_names;
2242 struct ref **stale_refs_tail;
2243 struct refspec *refs;
2244 int ref_count;
2245 };
2246
2247 static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
2248 int flags, void *cb_data)
2249 {
2250 struct stale_heads_info *info = cb_data;
2251 struct string_list matches = STRING_LIST_INIT_DUP;
2252 struct refspec query;
2253 int i, stale = 1;
2254 memset(&query, 0, sizeof(struct refspec));
2255 query.dst = (char *)refname;
2256
2257 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2258 if (matches.nr == 0)
2259 goto clean_exit; /* No matches */
2260
2261 /*
2262 * If we did find a suitable refspec and it's not a symref and
2263 * it's not in the list of refs that currently exist in that
2264 * remote, we consider it to be stale. In order to deal with
2265 * overlapping refspecs, we need to go over all of the
2266 * matching refs.
2267 */
2268 if (flags & REF_ISSYMREF)
2269 goto clean_exit;
2270
2271 for (i = 0; stale && i < matches.nr; i++)
2272 if (string_list_has_string(info->ref_names, matches.items[i].string))
2273 stale = 0;
2274
2275 if (stale) {
2276 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2277 hashcpy(ref->new_sha1, oid->hash);
2278 }
2279
2280 clean_exit:
2281 string_list_clear(&matches, 0);
2282 return 0;
2283 }
2284
2285 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2286 {
2287 struct ref *ref, *stale_refs = NULL;
2288 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2289 struct stale_heads_info info;
2290
2291 info.ref_names = &ref_names;
2292 info.stale_refs_tail = &stale_refs;
2293 info.refs = refs;
2294 info.ref_count = ref_count;
2295 for (ref = fetch_map; ref; ref = ref->next)
2296 string_list_append(&ref_names, ref->name);
2297 string_list_sort(&ref_names);
2298 for_each_ref(get_stale_heads_cb, &info);
2299 string_list_clear(&ref_names, 0);
2300 return stale_refs;
2301 }
2302
2303 /*
2304 * Compare-and-swap
2305 */
2306 static void clear_cas_option(struct push_cas_option *cas)
2307 {
2308 int i;
2309
2310 for (i = 0; i < cas->nr; i++)
2311 free(cas->entry[i].refname);
2312 free(cas->entry);
2313 memset(cas, 0, sizeof(*cas));
2314 }
2315
2316 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2317 const char *refname,
2318 size_t refnamelen)
2319 {
2320 struct push_cas *entry;
2321 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2322 entry = &cas->entry[cas->nr++];
2323 memset(entry, 0, sizeof(*entry));
2324 entry->refname = xmemdupz(refname, refnamelen);
2325 return entry;
2326 }
2327
2328 int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2329 {
2330 const char *colon;
2331 struct push_cas *entry;
2332
2333 if (unset) {
2334 /* "--no-<option>" */
2335 clear_cas_option(cas);
2336 return 0;
2337 }
2338
2339 if (!arg) {
2340 /* just "--<option>" */
2341 cas->use_tracking_for_rest = 1;
2342 return 0;
2343 }
2344
2345 /* "--<option>=refname" or "--<option>=refname:value" */
2346 colon = strchrnul(arg, ':');
2347 entry = add_cas_entry(cas, arg, colon - arg);
2348 if (!*colon)
2349 entry->use_tracking = 1;
2350 else if (get_sha1(colon + 1, entry->expect))
2351 return error("cannot parse expected object name '%s'", colon + 1);
2352 return 0;
2353 }
2354
2355 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2356 {
2357 return parse_push_cas_option(opt->value, arg, unset);
2358 }
2359
2360 int is_empty_cas(const struct push_cas_option *cas)
2361 {
2362 return !cas->use_tracking_for_rest && !cas->nr;
2363 }
2364
2365 /*
2366 * Look at remote.fetch refspec and see if we have a remote
2367 * tracking branch for the refname there. Fill its current
2368 * value in sha1[].
2369 * If we cannot do so, return negative to signal an error.
2370 */
2371 static int remote_tracking(struct remote *remote, const char *refname,
2372 unsigned char sha1[20])
2373 {
2374 char *dst;
2375
2376 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2377 if (!dst)
2378 return -1; /* no tracking ref for refname at remote */
2379 if (read_ref(dst, sha1))
2380 return -1; /* we know what the tracking ref is but we cannot read it */
2381 return 0;
2382 }
2383
2384 static void apply_cas(struct push_cas_option *cas,
2385 struct remote *remote,
2386 struct ref *ref)
2387 {
2388 int i;
2389
2390 /* Find an explicit --<option>=<name>[:<value>] entry */
2391 for (i = 0; i < cas->nr; i++) {
2392 struct push_cas *entry = &cas->entry[i];
2393 if (!refname_match(entry->refname, ref->name))
2394 continue;
2395 ref->expect_old_sha1 = 1;
2396 if (!entry->use_tracking)
2397 hashcpy(ref->old_sha1_expect, cas->entry[i].expect);
2398 else if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2399 ref->expect_old_no_trackback = 1;
2400 return;
2401 }
2402
2403 /* Are we using "--<option>" to cover all? */
2404 if (!cas->use_tracking_for_rest)
2405 return;
2406
2407 ref->expect_old_sha1 = 1;
2408 if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2409 ref->expect_old_no_trackback = 1;
2410 }
2411
2412 void apply_push_cas(struct push_cas_option *cas,
2413 struct remote *remote,
2414 struct ref *remote_refs)
2415 {
2416 struct ref *ref;
2417 for (ref = remote_refs; ref; ref = ref->next)
2418 apply_cas(cas, remote, ref);
2419 }
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