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builtin/remote: rewrite functions to take object_id arguments
[git/mjg.git] / remote.c
blob6d66ec15f48de998d33bea250e616844a466ad1d
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 *default_remote_name;
53 static const char *branch_pushremote_name;
54 static const char *pushremote_name;
55 static int explicit_default_remote_name;
56
57 static struct rewrites rewrites;
58 static struct rewrites rewrites_push;
59
60 #define BUF_SIZE (2048)
61 static char buffer[BUF_SIZE];
62
63 static int valid_remote(const struct remote *remote)
64 {
65 return (!!remote->url) || (!!remote->foreign_vcs);
66 }
67
68 static const char *alias_url(const char *url, struct rewrites *r)
69 {
70 int i, j;
71 char *ret;
72 struct counted_string *longest;
73 int longest_i;
74
75 longest = NULL;
76 longest_i = -1;
77 for (i = 0; i < r->rewrite_nr; i++) {
78 if (!r->rewrite[i])
79 continue;
80 for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
81 if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
82 (!longest ||
83 longest->len < r->rewrite[i]->instead_of[j].len)) {
84 longest = &(r->rewrite[i]->instead_of[j]);
85 longest_i = i;
86 }
87 }
88 }
89 if (!longest)
90 return url;
91
92 ret = xmalloc(r->rewrite[longest_i]->baselen +
93 (strlen(url) - longest->len) + 1);
94 strcpy(ret, r->rewrite[longest_i]->base);
95 strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
96 return ret;
97 }
98
99 static void add_push_refspec(struct remote *remote, const char *ref)
100 {
101 ALLOC_GROW(remote->push_refspec,
102 remote->push_refspec_nr + 1,
103 remote->push_refspec_alloc);
104 remote->push_refspec[remote->push_refspec_nr++] = ref;
105 }
106
107 static void add_fetch_refspec(struct remote *remote, const char *ref)
108 {
109 ALLOC_GROW(remote->fetch_refspec,
110 remote->fetch_refspec_nr + 1,
111 remote->fetch_refspec_alloc);
112 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
113 }
114
115 static void add_url(struct remote *remote, const char *url)
116 {
117 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
118 remote->url[remote->url_nr++] = url;
119 }
120
121 static void add_pushurl(struct remote *remote, const char *pushurl)
122 {
123 ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
124 remote->pushurl[remote->pushurl_nr++] = pushurl;
125 }
126
127 static void add_pushurl_alias(struct remote *remote, const char *url)
128 {
129 const char *pushurl = alias_url(url, &rewrites_push);
130 if (pushurl != url)
131 add_pushurl(remote, pushurl);
132 }
133
134 static void add_url_alias(struct remote *remote, const char *url)
135 {
136 add_url(remote, alias_url(url, &rewrites));
137 add_pushurl_alias(remote, url);
138 }
139
140 struct remotes_hash_key {
141 const char *str;
142 int len;
143 };
144
145 static int remotes_hash_cmp(const struct remote *a, const struct remote *b, const struct remotes_hash_key *key)
146 {
147 if (key)
148 return strncmp(a->name, key->str, key->len) || a->name[key->len];
149 else
150 return strcmp(a->name, b->name);
151 }
152
153 static inline void init_remotes_hash(void)
154 {
155 if (!remotes_hash.cmpfn)
156 hashmap_init(&remotes_hash, (hashmap_cmp_fn)remotes_hash_cmp, 0);
157 }
158
159 static struct remote *make_remote(const char *name, int len)
160 {
161 struct remote *ret, *replaced;
162 struct remotes_hash_key lookup;
163 struct hashmap_entry lookup_entry;
164
165 if (!len)
166 len = strlen(name);
167
168 init_remotes_hash();
169 lookup.str = name;
170 lookup.len = len;
171 hashmap_entry_init(&lookup_entry, memhash(name, len));
172
173 if ((ret = hashmap_get(&remotes_hash, &lookup_entry, &lookup)) != NULL)
174 return ret;
175
176 ret = xcalloc(1, sizeof(struct remote));
177 ret->prune = -1; /* unspecified */
178 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
179 remotes[remotes_nr++] = ret;
180 ret->name = xstrndup(name, len);
181
182 hashmap_entry_init(ret, lookup_entry.hash);
183 replaced = hashmap_put(&remotes_hash, ret);
184 assert(replaced == NULL); /* no previous entry overwritten */
185 return ret;
186 }
187
188 static void add_merge(struct branch *branch, const char *name)
189 {
190 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
191 branch->merge_alloc);
192 branch->merge_name[branch->merge_nr++] = name;
193 }
194
195 static struct branch *make_branch(const char *name, int len)
196 {
197 struct branch *ret;
198 int i;
199
200 for (i = 0; i < branches_nr; i++) {
201 if (len ? (!strncmp(name, branches[i]->name, len) &&
202 !branches[i]->name[len]) :
203 !strcmp(name, branches[i]->name))
204 return branches[i];
205 }
206
207 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
208 ret = xcalloc(1, sizeof(struct branch));
209 branches[branches_nr++] = ret;
210 if (len)
211 ret->name = xstrndup(name, len);
212 else
213 ret->name = xstrdup(name);
214 ret->refname = xstrfmt("refs/heads/%s", ret->name);
215
216 return ret;
217 }
218
219 static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
220 {
221 struct rewrite *ret;
222 int i;
223
224 for (i = 0; i < r->rewrite_nr; i++) {
225 if (len
226 ? (len == r->rewrite[i]->baselen &&
227 !strncmp(base, r->rewrite[i]->base, len))
228 : !strcmp(base, r->rewrite[i]->base))
229 return r->rewrite[i];
230 }
231
232 ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
233 ret = xcalloc(1, sizeof(struct rewrite));
234 r->rewrite[r->rewrite_nr++] = ret;
235 if (len) {
236 ret->base = xstrndup(base, len);
237 ret->baselen = len;
238 }
239 else {
240 ret->base = xstrdup(base);
241 ret->baselen = strlen(base);
242 }
243 return ret;
244 }
245
246 static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
247 {
248 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
249 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
250 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
251 rewrite->instead_of_nr++;
252 }
253
254 static void read_remotes_file(struct remote *remote)
255 {
256 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
257
258 if (!f)
259 return;
260 remote->origin = REMOTE_REMOTES;
261 while (fgets(buffer, BUF_SIZE, f)) {
262 int value_list;
263 char *s, *p;
264
265 if (starts_with(buffer, "URL:")) {
266 value_list = 0;
267 s = buffer + 4;
268 } else if (starts_with(buffer, "Push:")) {
269 value_list = 1;
270 s = buffer + 5;
271 } else if (starts_with(buffer, "Pull:")) {
272 value_list = 2;
273 s = buffer + 5;
274 } else
275 continue;
276
277 while (isspace(*s))
278 s++;
279 if (!*s)
280 continue;
281
282 p = s + strlen(s);
283 while (isspace(p[-1]))
284 *--p = 0;
285
286 switch (value_list) {
287 case 0:
288 add_url_alias(remote, xstrdup(s));
289 break;
290 case 1:
291 add_push_refspec(remote, xstrdup(s));
292 break;
293 case 2:
294 add_fetch_refspec(remote, xstrdup(s));
295 break;
296 }
297 }
298 fclose(f);
299 }
300
301 static void read_branches_file(struct remote *remote)
302 {
303 char *frag;
304 struct strbuf branch = STRBUF_INIT;
305 int n = 1000;
306 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
307 char *s, *p;
308 int len;
309
310 if (!f)
311 return;
312 s = fgets(buffer, BUF_SIZE, f);
313 fclose(f);
314 if (!s)
315 return;
316 while (isspace(*s))
317 s++;
318 if (!*s)
319 return;
320 remote->origin = REMOTE_BRANCHES;
321 p = s + strlen(s);
322 while (isspace(p[-1]))
323 *--p = 0;
324 len = p - s;
325 p = xmalloc(len + 1);
326 strcpy(p, s);
327
328 /*
329 * The branches file would have URL and optionally
330 * #branch specified. The "master" (or specified) branch is
331 * fetched and stored in the local branch of the same name.
332 */
333 frag = strchr(p, '#');
334 if (frag) {
335 *(frag++) = '\0';
336 strbuf_addf(&branch, "refs/heads/%s", frag);
337 } else
338 strbuf_addstr(&branch, "refs/heads/master");
339
340 strbuf_addf(&branch, ":refs/heads/%s", remote->name);
341 add_url_alias(remote, p);
342 add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
343 /*
344 * Cogito compatible push: push current HEAD to remote #branch
345 * (master if missing)
346 */
347 strbuf_init(&branch, 0);
348 strbuf_addstr(&branch, "HEAD");
349 if (frag)
350 strbuf_addf(&branch, ":refs/heads/%s", frag);
351 else
352 strbuf_addstr(&branch, ":refs/heads/master");
353 add_push_refspec(remote, strbuf_detach(&branch, NULL));
354 remote->fetch_tags = 1; /* always auto-follow */
355 }
356
357 static int handle_config(const char *key, const char *value, void *cb)
358 {
359 const char *name;
360 const char *subkey;
361 struct remote *remote;
362 struct branch *branch;
363 if (starts_with(key, "branch.")) {
364 name = key + 7;
365 subkey = strrchr(name, '.');
366 if (!subkey)
367 return 0;
368 branch = make_branch(name, subkey - name);
369 if (!strcmp(subkey, ".remote")) {
370 if (git_config_string(&branch->remote_name, key, value))
371 return -1;
372 if (branch == current_branch) {
373 default_remote_name = branch->remote_name;
374 explicit_default_remote_name = 1;
375 }
376 } else if (!strcmp(subkey, ".pushremote")) {
377 if (branch == current_branch)
378 if (git_config_string(&branch_pushremote_name, key, value))
379 return -1;
380 } else if (!strcmp(subkey, ".merge")) {
381 if (!value)
382 return config_error_nonbool(key);
383 add_merge(branch, xstrdup(value));
384 }
385 return 0;
386 }
387 if (starts_with(key, "url.")) {
388 struct rewrite *rewrite;
389 name = key + 4;
390 subkey = strrchr(name, '.');
391 if (!subkey)
392 return 0;
393 if (!strcmp(subkey, ".insteadof")) {
394 rewrite = make_rewrite(&rewrites, name, subkey - name);
395 if (!value)
396 return config_error_nonbool(key);
397 add_instead_of(rewrite, xstrdup(value));
398 } else if (!strcmp(subkey, ".pushinsteadof")) {
399 rewrite = make_rewrite(&rewrites_push, name, subkey - name);
400 if (!value)
401 return config_error_nonbool(key);
402 add_instead_of(rewrite, xstrdup(value));
403 }
404 }
405
406 if (!starts_with(key, "remote."))
407 return 0;
408 name = key + 7;
409
410 /* Handle remote.* variables */
411 if (!strcmp(name, "pushdefault"))
412 return git_config_string(&pushremote_name, key, value);
413
414 /* Handle remote.<name>.* variables */
415 if (*name == '/') {
416 warning("Config remote shorthand cannot begin with '/': %s",
417 name);
418 return 0;
419 }
420 subkey = strrchr(name, '.');
421 if (!subkey)
422 return 0;
423 remote = make_remote(name, subkey - name);
424 remote->origin = REMOTE_CONFIG;
425 if (!strcmp(subkey, ".mirror"))
426 remote->mirror = git_config_bool(key, value);
427 else if (!strcmp(subkey, ".skipdefaultupdate"))
428 remote->skip_default_update = git_config_bool(key, value);
429 else if (!strcmp(subkey, ".skipfetchall"))
430 remote->skip_default_update = git_config_bool(key, value);
431 else if (!strcmp(subkey, ".prune"))
432 remote->prune = git_config_bool(key, value);
433 else if (!strcmp(subkey, ".url")) {
434 const char *v;
435 if (git_config_string(&v, key, value))
436 return -1;
437 add_url(remote, v);
438 } else if (!strcmp(subkey, ".pushurl")) {
439 const char *v;
440 if (git_config_string(&v, key, value))
441 return -1;
442 add_pushurl(remote, v);
443 } else if (!strcmp(subkey, ".push")) {
444 const char *v;
445 if (git_config_string(&v, key, value))
446 return -1;
447 add_push_refspec(remote, v);
448 } else if (!strcmp(subkey, ".fetch")) {
449 const char *v;
450 if (git_config_string(&v, key, value))
451 return -1;
452 add_fetch_refspec(remote, v);
453 } else if (!strcmp(subkey, ".receivepack")) {
454 const char *v;
455 if (git_config_string(&v, key, value))
456 return -1;
457 if (!remote->receivepack)
458 remote->receivepack = v;
459 else
460 error("more than one receivepack given, using the first");
461 } else if (!strcmp(subkey, ".uploadpack")) {
462 const char *v;
463 if (git_config_string(&v, key, value))
464 return -1;
465 if (!remote->uploadpack)
466 remote->uploadpack = v;
467 else
468 error("more than one uploadpack given, using the first");
469 } else if (!strcmp(subkey, ".tagopt")) {
470 if (!strcmp(value, "--no-tags"))
471 remote->fetch_tags = -1;
472 else if (!strcmp(value, "--tags"))
473 remote->fetch_tags = 2;
474 } else if (!strcmp(subkey, ".proxy")) {
475 return git_config_string((const char **)&remote->http_proxy,
476 key, value);
477 } else if (!strcmp(subkey, ".vcs")) {
478 return git_config_string(&remote->foreign_vcs, key, value);
479 }
480 return 0;
481 }
482
483 static void alias_all_urls(void)
484 {
485 int i, j;
486 for (i = 0; i < remotes_nr; i++) {
487 int add_pushurl_aliases;
488 if (!remotes[i])
489 continue;
490 for (j = 0; j < remotes[i]->pushurl_nr; j++) {
491 remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
492 }
493 add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
494 for (j = 0; j < remotes[i]->url_nr; j++) {
495 if (add_pushurl_aliases)
496 add_pushurl_alias(remotes[i], remotes[i]->url[j]);
497 remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
498 }
499 }
500 }
501
502 static void read_config(void)
503 {
504 unsigned char sha1[20];
505 const char *head_ref;
506 int flag;
507 if (default_remote_name) /* did this already */
508 return;
509 default_remote_name = "origin";
510 current_branch = NULL;
511 head_ref = resolve_ref_unsafe("HEAD", 0, sha1, &flag);
512 if (head_ref && (flag & REF_ISSYMREF) &&
513 skip_prefix(head_ref, "refs/heads/", &head_ref)) {
514 current_branch = make_branch(head_ref, 0);
515 }
516 git_config(handle_config, NULL);
517 if (branch_pushremote_name) {
518 free((char *)pushremote_name);
519 pushremote_name = branch_pushremote_name;
520 }
521 alias_all_urls();
522 }
523
524 /*
525 * This function frees a refspec array.
526 * Warning: code paths should be checked to ensure that the src
527 * and dst pointers are always freeable pointers as well
528 * as the refspec pointer itself.
529 */
530 static void free_refspecs(struct refspec *refspec, int nr_refspec)
531 {
532 int i;
533
534 if (!refspec)
535 return;
536
537 for (i = 0; i < nr_refspec; i++) {
538 free(refspec[i].src);
539 free(refspec[i].dst);
540 }
541 free(refspec);
542 }
543
544 static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
545 {
546 int i;
547 struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
548
549 for (i = 0; i < nr_refspec; i++) {
550 size_t llen;
551 int is_glob;
552 const char *lhs, *rhs;
553 int flags;
554
555 is_glob = 0;
556
557 lhs = refspec[i];
558 if (*lhs == '+') {
559 rs[i].force = 1;
560 lhs++;
561 }
562
563 rhs = strrchr(lhs, ':');
564
565 /*
566 * Before going on, special case ":" (or "+:") as a refspec
567 * for pushing matching refs.
568 */
569 if (!fetch && rhs == lhs && rhs[1] == '\0') {
570 rs[i].matching = 1;
571 continue;
572 }
573
574 if (rhs) {
575 size_t rlen = strlen(++rhs);
576 is_glob = (1 <= rlen && strchr(rhs, '*'));
577 rs[i].dst = xstrndup(rhs, rlen);
578 }
579
580 llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
581 if (1 <= llen && memchr(lhs, '*', llen)) {
582 if ((rhs && !is_glob) || (!rhs && fetch))
583 goto invalid;
584 is_glob = 1;
585 } else if (rhs && is_glob) {
586 goto invalid;
587 }
588
589 rs[i].pattern = is_glob;
590 rs[i].src = xstrndup(lhs, llen);
591 flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
592
593 if (fetch) {
594 unsigned char unused[40];
595
596 /* LHS */
597 if (!*rs[i].src)
598 ; /* empty is ok; it means "HEAD" */
599 else if (llen == 40 && !get_sha1_hex(rs[i].src, unused))
600 rs[i].exact_sha1 = 1; /* ok */
601 else if (!check_refname_format(rs[i].src, flags))
602 ; /* valid looking ref is ok */
603 else
604 goto invalid;
605 /* RHS */
606 if (!rs[i].dst)
607 ; /* missing is ok; it is the same as empty */
608 else if (!*rs[i].dst)
609 ; /* empty is ok; it means "do not store" */
610 else if (!check_refname_format(rs[i].dst, flags))
611 ; /* valid looking ref is ok */
612 else
613 goto invalid;
614 } else {
615 /*
616 * LHS
617 * - empty is allowed; it means delete.
618 * - when wildcarded, it must be a valid looking ref.
619 * - otherwise, it must be an extended SHA-1, but
620 * there is no existing way to validate this.
621 */
622 if (!*rs[i].src)
623 ; /* empty is ok */
624 else if (is_glob) {
625 if (check_refname_format(rs[i].src, flags))
626 goto invalid;
627 }
628 else
629 ; /* anything goes, for now */
630 /*
631 * RHS
632 * - missing is allowed, but LHS then must be a
633 * valid looking ref.
634 * - empty is not allowed.
635 * - otherwise it must be a valid looking ref.
636 */
637 if (!rs[i].dst) {
638 if (check_refname_format(rs[i].src, flags))
639 goto invalid;
640 } else if (!*rs[i].dst) {
641 goto invalid;
642 } else {
643 if (check_refname_format(rs[i].dst, flags))
644 goto invalid;
645 }
646 }
647 }
648 return rs;
649
650 invalid:
651 if (verify) {
652 /*
653 * nr_refspec must be greater than zero and i must be valid
654 * since it is only possible to reach this point from within
655 * the for loop above.
656 */
657 free_refspecs(rs, i+1);
658 return NULL;
659 }
660 die("Invalid refspec '%s'", refspec[i]);
661 }
662
663 int valid_fetch_refspec(const char *fetch_refspec_str)
664 {
665 struct refspec *refspec;
666
667 refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
668 free_refspecs(refspec, 1);
669 return !!refspec;
670 }
671
672 struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
673 {
674 return parse_refspec_internal(nr_refspec, refspec, 1, 0);
675 }
676
677 static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
678 {
679 return parse_refspec_internal(nr_refspec, refspec, 0, 0);
680 }
681
682 void free_refspec(int nr_refspec, struct refspec *refspec)
683 {
684 int i;
685 for (i = 0; i < nr_refspec; i++) {
686 free(refspec[i].src);
687 free(refspec[i].dst);
688 }
689 free(refspec);
690 }
691
692 static int valid_remote_nick(const char *name)
693 {
694 if (!name[0] || is_dot_or_dotdot(name))
695 return 0;
696 return !strchr(name, '/'); /* no slash */
697 }
698
699 static struct remote *remote_get_1(const char *name, const char *pushremote_name)
700 {
701 struct remote *ret;
702 int name_given = 0;
703
704 if (name)
705 name_given = 1;
706 else {
707 if (pushremote_name) {
708 name = pushremote_name;
709 name_given = 1;
710 } else {
711 name = default_remote_name;
712 name_given = explicit_default_remote_name;
713 }
714 }
715
716 ret = make_remote(name, 0);
717 if (valid_remote_nick(name)) {
718 if (!valid_remote(ret))
719 read_remotes_file(ret);
720 if (!valid_remote(ret))
721 read_branches_file(ret);
722 }
723 if (name_given && !valid_remote(ret))
724 add_url_alias(ret, name);
725 if (!valid_remote(ret))
726 return NULL;
727 ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
728 ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
729 return ret;
730 }
731
732 struct remote *remote_get(const char *name)
733 {
734 read_config();
735 return remote_get_1(name, NULL);
736 }
737
738 struct remote *pushremote_get(const char *name)
739 {
740 read_config();
741 return remote_get_1(name, pushremote_name);
742 }
743
744 int remote_is_configured(const char *name)
745 {
746 struct remotes_hash_key lookup;
747 struct hashmap_entry lookup_entry;
748 read_config();
749
750 init_remotes_hash();
751 lookup.str = name;
752 lookup.len = strlen(name);
753 hashmap_entry_init(&lookup_entry, memhash(name, lookup.len));
754
755 return hashmap_get(&remotes_hash, &lookup_entry, &lookup) != NULL;
756 }
757
758 int for_each_remote(each_remote_fn fn, void *priv)
759 {
760 int i, result = 0;
761 read_config();
762 for (i = 0; i < remotes_nr && !result; i++) {
763 struct remote *r = remotes[i];
764 if (!r)
765 continue;
766 if (!r->fetch)
767 r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
768 r->fetch_refspec);
769 if (!r->push)
770 r->push = parse_push_refspec(r->push_refspec_nr,
771 r->push_refspec);
772 result = fn(r, priv);
773 }
774 return result;
775 }
776
777 static void handle_duplicate(struct ref *ref1, struct ref *ref2)
778 {
779 if (strcmp(ref1->name, ref2->name)) {
780 if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
781 ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
782 die(_("Cannot fetch both %s and %s to %s"),
783 ref1->name, ref2->name, ref2->peer_ref->name);
784 } else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
785 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
786 warning(_("%s usually tracks %s, not %s"),
787 ref2->peer_ref->name, ref2->name, ref1->name);
788 } else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
789 ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
790 die(_("%s tracks both %s and %s"),
791 ref2->peer_ref->name, ref1->name, ref2->name);
792 } else {
793 /*
794 * This last possibility doesn't occur because
795 * FETCH_HEAD_IGNORE entries always appear at
796 * the end of the list.
797 */
798 die(_("Internal error"));
799 }
800 }
801 free(ref2->peer_ref);
802 free(ref2);
803 }
804
805 struct ref *ref_remove_duplicates(struct ref *ref_map)
806 {
807 struct string_list refs = STRING_LIST_INIT_NODUP;
808 struct ref *retval = NULL;
809 struct ref **p = &retval;
810
811 while (ref_map) {
812 struct ref *ref = ref_map;
813
814 ref_map = ref_map->next;
815 ref->next = NULL;
816
817 if (!ref->peer_ref) {
818 *p = ref;
819 p = &ref->next;
820 } else {
821 struct string_list_item *item =
822 string_list_insert(&refs, ref->peer_ref->name);
823
824 if (item->util) {
825 /* Entry already existed */
826 handle_duplicate((struct ref *)item->util, ref);
827 } else {
828 *p = ref;
829 p = &ref->next;
830 item->util = ref;
831 }
832 }
833 }
834
835 string_list_clear(&refs, 0);
836 return retval;
837 }
838
839 int remote_has_url(struct remote *remote, const char *url)
840 {
841 int i;
842 for (i = 0; i < remote->url_nr; i++) {
843 if (!strcmp(remote->url[i], url))
844 return 1;
845 }
846 return 0;
847 }
848
849 static int match_name_with_pattern(const char *key, const char *name,
850 const char *value, char **result)
851 {
852 const char *kstar = strchr(key, '*');
853 size_t klen;
854 size_t ksuffixlen;
855 size_t namelen;
856 int ret;
857 if (!kstar)
858 die("Key '%s' of pattern had no '*'", key);
859 klen = kstar - key;
860 ksuffixlen = strlen(kstar + 1);
861 namelen = strlen(name);
862 ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
863 !memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
864 if (ret && value) {
865 struct strbuf sb = STRBUF_INIT;
866 const char *vstar = strchr(value, '*');
867 if (!vstar)
868 die("Value '%s' of pattern has no '*'", value);
869 strbuf_add(&sb, value, vstar - value);
870 strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
871 strbuf_addstr(&sb, vstar + 1);
872 *result = strbuf_detach(&sb, NULL);
873 }
874 return ret;
875 }
876
877 static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
878 {
879 int i;
880 int find_src = !query->src;
881
882 if (find_src && !query->dst)
883 error("query_refspecs_multiple: need either src or dst");
884
885 for (i = 0; i < ref_count; i++) {
886 struct refspec *refspec = &refs[i];
887 const char *key = find_src ? refspec->dst : refspec->src;
888 const char *value = find_src ? refspec->src : refspec->dst;
889 const char *needle = find_src ? query->dst : query->src;
890 char **result = find_src ? &query->src : &query->dst;
891
892 if (!refspec->dst)
893 continue;
894 if (refspec->pattern) {
895 if (match_name_with_pattern(key, needle, value, result))
896 string_list_append_nodup(results, *result);
897 } else if (!strcmp(needle, key)) {
898 string_list_append(results, value);
899 }
900 }
901 }
902
903 int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
904 {
905 int i;
906 int find_src = !query->src;
907 const char *needle = find_src ? query->dst : query->src;
908 char **result = find_src ? &query->src : &query->dst;
909
910 if (find_src && !query->dst)
911 return error("query_refspecs: need either src or dst");
912
913 for (i = 0; i < ref_count; i++) {
914 struct refspec *refspec = &refs[i];
915 const char *key = find_src ? refspec->dst : refspec->src;
916 const char *value = find_src ? refspec->src : refspec->dst;
917
918 if (!refspec->dst)
919 continue;
920 if (refspec->pattern) {
921 if (match_name_with_pattern(key, needle, value, result)) {
922 query->force = refspec->force;
923 return 0;
924 }
925 } else if (!strcmp(needle, key)) {
926 *result = xstrdup(value);
927 query->force = refspec->force;
928 return 0;
929 }
930 }
931 return -1;
932 }
933
934 char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
935 const char *name)
936 {
937 struct refspec query;
938
939 memset(&query, 0, sizeof(struct refspec));
940 query.src = (char *)name;
941
942 if (query_refspecs(refspecs, nr_refspec, &query))
943 return NULL;
944
945 return query.dst;
946 }
947
948 int remote_find_tracking(struct remote *remote, struct refspec *refspec)
949 {
950 return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
951 }
952
953 static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
954 const char *name)
955 {
956 size_t len = strlen(name);
957 struct ref *ref = xcalloc(1, sizeof(struct ref) + prefixlen + len + 1);
958 memcpy(ref->name, prefix, prefixlen);
959 memcpy(ref->name + prefixlen, name, len);
960 return ref;
961 }
962
963 struct ref *alloc_ref(const char *name)
964 {
965 return alloc_ref_with_prefix("", 0, name);
966 }
967
968 struct ref *copy_ref(const struct ref *ref)
969 {
970 struct ref *cpy;
971 size_t len;
972 if (!ref)
973 return NULL;
974 len = strlen(ref->name);
975 cpy = xmalloc(sizeof(struct ref) + len + 1);
976 memcpy(cpy, ref, sizeof(struct ref) + len + 1);
977 cpy->next = NULL;
978 cpy->symref = xstrdup_or_null(ref->symref);
979 cpy->remote_status = xstrdup_or_null(ref->remote_status);
980 cpy->peer_ref = copy_ref(ref->peer_ref);
981 return cpy;
982 }
983
984 struct ref *copy_ref_list(const struct ref *ref)
985 {
986 struct ref *ret = NULL;
987 struct ref **tail = &ret;
988 while (ref) {
989 *tail = copy_ref(ref);
990 ref = ref->next;
991 tail = &((*tail)->next);
992 }
993 return ret;
994 }
995
996 static void free_ref(struct ref *ref)
997 {
998 if (!ref)
999 return;
1000 free_ref(ref->peer_ref);
1001 free(ref->remote_status);
1002 free(ref->symref);
1003 free(ref);
1004 }
1005
1006 void free_refs(struct ref *ref)
1007 {
1008 struct ref *next;
1009 while (ref) {
1010 next = ref->next;
1011 free_ref(ref);
1012 ref = next;
1013 }
1014 }
1015
1016 int ref_compare_name(const void *va, const void *vb)
1017 {
1018 const struct ref *a = va, *b = vb;
1019 return strcmp(a->name, b->name);
1020 }
1021
1022 static void *ref_list_get_next(const void *a)
1023 {
1024 return ((const struct ref *)a)->next;
1025 }
1026
1027 static void ref_list_set_next(void *a, void *next)
1028 {
1029 ((struct ref *)a)->next = next;
1030 }
1031
1032 void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
1033 {
1034 *l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
1035 }
1036
1037 int count_refspec_match(const char *pattern,
1038 struct ref *refs,
1039 struct ref **matched_ref)
1040 {
1041 int patlen = strlen(pattern);
1042 struct ref *matched_weak = NULL;
1043 struct ref *matched = NULL;
1044 int weak_match = 0;
1045 int match = 0;
1046
1047 for (weak_match = match = 0; refs; refs = refs->next) {
1048 char *name = refs->name;
1049 int namelen = strlen(name);
1050
1051 if (!refname_match(pattern, name))
1052 continue;
1053
1054 /* A match is "weak" if it is with refs outside
1055 * heads or tags, and did not specify the pattern
1056 * in full (e.g. "refs/remotes/origin/master") or at
1057 * least from the toplevel (e.g. "remotes/origin/master");
1058 * otherwise "git push $URL master" would result in
1059 * ambiguity between remotes/origin/master and heads/master
1060 * at the remote site.
1061 */
1062 if (namelen != patlen &&
1063 patlen != namelen - 5 &&
1064 !starts_with(name, "refs/heads/") &&
1065 !starts_with(name, "refs/tags/")) {
1066 /* We want to catch the case where only weak
1067 * matches are found and there are multiple
1068 * matches, and where more than one strong
1069 * matches are found, as ambiguous. One
1070 * strong match with zero or more weak matches
1071 * are acceptable as a unique match.
1072 */
1073 matched_weak = refs;
1074 weak_match++;
1075 }
1076 else {
1077 matched = refs;
1078 match++;
1079 }
1080 }
1081 if (!matched) {
1082 if (matched_ref)
1083 *matched_ref = matched_weak;
1084 return weak_match;
1085 }
1086 else {
1087 if (matched_ref)
1088 *matched_ref = matched;
1089 return match;
1090 }
1091 }
1092
1093 static void tail_link_ref(struct ref *ref, struct ref ***tail)
1094 {
1095 **tail = ref;
1096 while (ref->next)
1097 ref = ref->next;
1098 *tail = &ref->next;
1099 }
1100
1101 static struct ref *alloc_delete_ref(void)
1102 {
1103 struct ref *ref = alloc_ref("(delete)");
1104 hashclr(ref->new_sha1);
1105 return ref;
1106 }
1107
1108 static int try_explicit_object_name(const char *name,
1109 struct ref **match)
1110 {
1111 unsigned char sha1[20];
1112
1113 if (!*name) {
1114 if (match)
1115 *match = alloc_delete_ref();
1116 return 0;
1117 }
1118
1119 if (get_sha1(name, sha1))
1120 return -1;
1121
1122 if (match) {
1123 *match = alloc_ref(name);
1124 hashcpy((*match)->new_sha1, sha1);
1125 }
1126 return 0;
1127 }
1128
1129 static struct ref *make_linked_ref(const char *name, struct ref ***tail)
1130 {
1131 struct ref *ret = alloc_ref(name);
1132 tail_link_ref(ret, tail);
1133 return ret;
1134 }
1135
1136 static char *guess_ref(const char *name, struct ref *peer)
1137 {
1138 struct strbuf buf = STRBUF_INIT;
1139 unsigned char sha1[20];
1140
1141 const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
1142 sha1, NULL);
1143 if (!r)
1144 return NULL;
1145
1146 if (starts_with(r, "refs/heads/"))
1147 strbuf_addstr(&buf, "refs/heads/");
1148 else if (starts_with(r, "refs/tags/"))
1149 strbuf_addstr(&buf, "refs/tags/");
1150 else
1151 return NULL;
1152
1153 strbuf_addstr(&buf, name);
1154 return strbuf_detach(&buf, NULL);
1155 }
1156
1157 static int match_explicit_lhs(struct ref *src,
1158 struct refspec *rs,
1159 struct ref **match,
1160 int *allocated_match)
1161 {
1162 switch (count_refspec_match(rs->src, src, match)) {
1163 case 1:
1164 if (allocated_match)
1165 *allocated_match = 0;
1166 return 0;
1167 case 0:
1168 /* The source could be in the get_sha1() format
1169 * not a reference name. :refs/other is a
1170 * way to delete 'other' ref at the remote end.
1171 */
1172 if (try_explicit_object_name(rs->src, match) < 0)
1173 return error("src refspec %s does not match any.", rs->src);
1174 if (allocated_match)
1175 *allocated_match = 1;
1176 return 0;
1177 default:
1178 return error("src refspec %s matches more than one.", rs->src);
1179 }
1180 }
1181
1182 static int match_explicit(struct ref *src, struct ref *dst,
1183 struct ref ***dst_tail,
1184 struct refspec *rs)
1185 {
1186 struct ref *matched_src, *matched_dst;
1187 int allocated_src;
1188
1189 const char *dst_value = rs->dst;
1190 char *dst_guess;
1191
1192 if (rs->pattern || rs->matching)
1193 return 0;
1194
1195 matched_src = matched_dst = NULL;
1196 if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
1197 return -1;
1198
1199 if (!dst_value) {
1200 unsigned char sha1[20];
1201 int flag;
1202
1203 dst_value = resolve_ref_unsafe(matched_src->name,
1204 RESOLVE_REF_READING,
1205 sha1, &flag);
1206 if (!dst_value ||
1207 ((flag & REF_ISSYMREF) &&
1208 !starts_with(dst_value, "refs/heads/")))
1209 die("%s cannot be resolved to branch.",
1210 matched_src->name);
1211 }
1212
1213 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
1214 case 1:
1215 break;
1216 case 0:
1217 if (starts_with(dst_value, "refs/"))
1218 matched_dst = make_linked_ref(dst_value, dst_tail);
1219 else if (is_null_sha1(matched_src->new_sha1))
1220 error("unable to delete '%s': remote ref does not exist",
1221 dst_value);
1222 else if ((dst_guess = guess_ref(dst_value, matched_src)))
1223 matched_dst = make_linked_ref(dst_guess, dst_tail);
1224 else
1225 error("unable to push to unqualified destination: %s\n"
1226 "The destination refspec neither matches an "
1227 "existing ref on the remote nor\n"
1228 "begins with refs/, and we are unable to "
1229 "guess a prefix based on the source ref.",
1230 dst_value);
1231 break;
1232 default:
1233 matched_dst = NULL;
1234 error("dst refspec %s matches more than one.",
1235 dst_value);
1236 break;
1237 }
1238 if (!matched_dst)
1239 return -1;
1240 if (matched_dst->peer_ref)
1241 return error("dst ref %s receives from more than one src.",
1242 matched_dst->name);
1243 else {
1244 matched_dst->peer_ref = allocated_src ?
1245 matched_src :
1246 copy_ref(matched_src);
1247 matched_dst->force = rs->force;
1248 }
1249 return 0;
1250 }
1251
1252 static int match_explicit_refs(struct ref *src, struct ref *dst,
1253 struct ref ***dst_tail, struct refspec *rs,
1254 int rs_nr)
1255 {
1256 int i, errs;
1257 for (i = errs = 0; i < rs_nr; i++)
1258 errs += match_explicit(src, dst, dst_tail, &rs[i]);
1259 return errs;
1260 }
1261
1262 static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
1263 int send_mirror, int direction, const struct refspec **ret_pat)
1264 {
1265 const struct refspec *pat;
1266 char *name;
1267 int i;
1268 int matching_refs = -1;
1269 for (i = 0; i < rs_nr; i++) {
1270 if (rs[i].matching &&
1271 (matching_refs == -1 || rs[i].force)) {
1272 matching_refs = i;
1273 continue;
1274 }
1275
1276 if (rs[i].pattern) {
1277 const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
1278 int match;
1279 if (direction == FROM_SRC)
1280 match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
1281 else
1282 match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
1283 if (match) {
1284 matching_refs = i;
1285 break;
1286 }
1287 }
1288 }
1289 if (matching_refs == -1)
1290 return NULL;
1291
1292 pat = rs + matching_refs;
1293 if (pat->matching) {
1294 /*
1295 * "matching refs"; traditionally we pushed everything
1296 * including refs outside refs/heads/ hierarchy, but
1297 * that does not make much sense these days.
1298 */
1299 if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
1300 return NULL;
1301 name = xstrdup(ref->name);
1302 }
1303 if (ret_pat)
1304 *ret_pat = pat;
1305 return name;
1306 }
1307
1308 static struct ref **tail_ref(struct ref **head)
1309 {
1310 struct ref **tail = head;
1311 while (*tail)
1312 tail = &((*tail)->next);
1313 return tail;
1314 }
1315
1316 struct tips {
1317 struct commit **tip;
1318 int nr, alloc;
1319 };
1320
1321 static void add_to_tips(struct tips *tips, const unsigned char *sha1)
1322 {
1323 struct commit *commit;
1324
1325 if (is_null_sha1(sha1))
1326 return;
1327 commit = lookup_commit_reference_gently(sha1, 1);
1328 if (!commit || (commit->object.flags & TMP_MARK))
1329 return;
1330 commit->object.flags |= TMP_MARK;
1331 ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
1332 tips->tip[tips->nr++] = commit;
1333 }
1334
1335 static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
1336 {
1337 struct string_list dst_tag = STRING_LIST_INIT_NODUP;
1338 struct string_list src_tag = STRING_LIST_INIT_NODUP;
1339 struct string_list_item *item;
1340 struct ref *ref;
1341 struct tips sent_tips;
1342
1343 /*
1344 * Collect everything we know they would have at the end of
1345 * this push, and collect all tags they have.
1346 */
1347 memset(&sent_tips, 0, sizeof(sent_tips));
1348 for (ref = *dst; ref; ref = ref->next) {
1349 if (ref->peer_ref &&
1350 !is_null_sha1(ref->peer_ref->new_sha1))
1351 add_to_tips(&sent_tips, ref->peer_ref->new_sha1);
1352 else
1353 add_to_tips(&sent_tips, ref->old_sha1);
1354 if (starts_with(ref->name, "refs/tags/"))
1355 string_list_append(&dst_tag, ref->name);
1356 }
1357 clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
1358
1359 string_list_sort(&dst_tag);
1360
1361 /* Collect tags they do not have. */
1362 for (ref = src; ref; ref = ref->next) {
1363 if (!starts_with(ref->name, "refs/tags/"))
1364 continue; /* not a tag */
1365 if (string_list_has_string(&dst_tag, ref->name))
1366 continue; /* they already have it */
1367 if (sha1_object_info(ref->new_sha1, NULL) != OBJ_TAG)
1368 continue; /* be conservative */
1369 item = string_list_append(&src_tag, ref->name);
1370 item->util = ref;
1371 }
1372 string_list_clear(&dst_tag, 0);
1373
1374 /*
1375 * At this point, src_tag lists tags that are missing from
1376 * dst, and sent_tips lists the tips we are pushing or those
1377 * that we know they already have. An element in the src_tag
1378 * that is an ancestor of any of the sent_tips needs to be
1379 * sent to the other side.
1380 */
1381 if (sent_tips.nr) {
1382 for_each_string_list_item(item, &src_tag) {
1383 struct ref *ref = item->util;
1384 struct ref *dst_ref;
1385 struct commit *commit;
1386
1387 if (is_null_sha1(ref->new_sha1))
1388 continue;
1389 commit = lookup_commit_reference_gently(ref->new_sha1, 1);
1390 if (!commit)
1391 /* not pushing a commit, which is not an error */
1392 continue;
1393
1394 /*
1395 * Is this tag, which they do not have, reachable from
1396 * any of the commits we are sending?
1397 */
1398 if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
1399 continue;
1400
1401 /* Add it in */
1402 dst_ref = make_linked_ref(ref->name, dst_tail);
1403 hashcpy(dst_ref->new_sha1, ref->new_sha1);
1404 dst_ref->peer_ref = copy_ref(ref);
1405 }
1406 }
1407 string_list_clear(&src_tag, 0);
1408 free(sent_tips.tip);
1409 }
1410
1411 struct ref *find_ref_by_name(const struct ref *list, const char *name)
1412 {
1413 for ( ; list; list = list->next)
1414 if (!strcmp(list->name, name))
1415 return (struct ref *)list;
1416 return NULL;
1417 }
1418
1419 static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
1420 {
1421 for ( ; ref; ref = ref->next)
1422 string_list_append_nodup(ref_index, ref->name)->util = ref;
1423
1424 string_list_sort(ref_index);
1425 }
1426
1427 /*
1428 * Given only the set of local refs, sanity-check the set of push
1429 * refspecs. We can't catch all errors that match_push_refs would,
1430 * but we can catch some errors early before even talking to the
1431 * remote side.
1432 */
1433 int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
1434 {
1435 struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
1436 int ret = 0;
1437 int i;
1438
1439 for (i = 0; i < nr_refspec; i++) {
1440 struct refspec *rs = refspec + i;
1441
1442 if (rs->pattern || rs->matching)
1443 continue;
1444
1445 ret |= match_explicit_lhs(src, rs, NULL, NULL);
1446 }
1447
1448 free_refspec(nr_refspec, refspec);
1449 return ret;
1450 }
1451
1452 /*
1453 * Given the set of refs the local repository has, the set of refs the
1454 * remote repository has, and the refspec used for push, determine
1455 * what remote refs we will update and with what value by setting
1456 * peer_ref (which object is being pushed) and force (if the push is
1457 * forced) in elements of "dst". The function may add new elements to
1458 * dst (e.g. pushing to a new branch, done in match_explicit_refs).
1459 */
1460 int match_push_refs(struct ref *src, struct ref **dst,
1461 int nr_refspec, const char **refspec, int flags)
1462 {
1463 struct refspec *rs;
1464 int send_all = flags & MATCH_REFS_ALL;
1465 int send_mirror = flags & MATCH_REFS_MIRROR;
1466 int send_prune = flags & MATCH_REFS_PRUNE;
1467 int errs;
1468 static const char *default_refspec[] = { ":", NULL };
1469 struct ref *ref, **dst_tail = tail_ref(dst);
1470 struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
1471
1472 if (!nr_refspec) {
1473 nr_refspec = 1;
1474 refspec = default_refspec;
1475 }
1476 rs = parse_push_refspec(nr_refspec, (const char **) refspec);
1477 errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
1478
1479 /* pick the remainder */
1480 for (ref = src; ref; ref = ref->next) {
1481 struct string_list_item *dst_item;
1482 struct ref *dst_peer;
1483 const struct refspec *pat = NULL;
1484 char *dst_name;
1485
1486 dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
1487 if (!dst_name)
1488 continue;
1489
1490 if (!dst_ref_index.nr)
1491 prepare_ref_index(&dst_ref_index, *dst);
1492
1493 dst_item = string_list_lookup(&dst_ref_index, dst_name);
1494 dst_peer = dst_item ? dst_item->util : NULL;
1495 if (dst_peer) {
1496 if (dst_peer->peer_ref)
1497 /* We're already sending something to this ref. */
1498 goto free_name;
1499 } else {
1500 if (pat->matching && !(send_all || send_mirror))
1501 /*
1502 * Remote doesn't have it, and we have no
1503 * explicit pattern, and we don't have
1504 * --all or --mirror.
1505 */
1506 goto free_name;
1507
1508 /* Create a new one and link it */
1509 dst_peer = make_linked_ref(dst_name, &dst_tail);
1510 hashcpy(dst_peer->new_sha1, ref->new_sha1);
1511 string_list_insert(&dst_ref_index,
1512 dst_peer->name)->util = dst_peer;
1513 }
1514 dst_peer->peer_ref = copy_ref(ref);
1515 dst_peer->force = pat->force;
1516 free_name:
1517 free(dst_name);
1518 }
1519
1520 string_list_clear(&dst_ref_index, 0);
1521
1522 if (flags & MATCH_REFS_FOLLOW_TAGS)
1523 add_missing_tags(src, dst, &dst_tail);
1524
1525 if (send_prune) {
1526 struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
1527 /* check for missing refs on the remote */
1528 for (ref = *dst; ref; ref = ref->next) {
1529 char *src_name;
1530
1531 if (ref->peer_ref)
1532 /* We're already sending something to this ref. */
1533 continue;
1534
1535 src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
1536 if (src_name) {
1537 if (!src_ref_index.nr)
1538 prepare_ref_index(&src_ref_index, src);
1539 if (!string_list_has_string(&src_ref_index,
1540 src_name))
1541 ref->peer_ref = alloc_delete_ref();
1542 free(src_name);
1543 }
1544 }
1545 string_list_clear(&src_ref_index, 0);
1546 }
1547 if (errs)
1548 return -1;
1549 return 0;
1550 }
1551
1552 void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
1553 int force_update)
1554 {
1555 struct ref *ref;
1556
1557 for (ref = remote_refs; ref; ref = ref->next) {
1558 int force_ref_update = ref->force || force_update;
1559 int reject_reason = 0;
1560
1561 if (ref->peer_ref)
1562 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1563 else if (!send_mirror)
1564 continue;
1565
1566 ref->deletion = is_null_sha1(ref->new_sha1);
1567 if (!ref->deletion &&
1568 !hashcmp(ref->old_sha1, ref->new_sha1)) {
1569 ref->status = REF_STATUS_UPTODATE;
1570 continue;
1571 }
1572
1573 /*
1574 * Bypass the usual "must fast-forward" check but
1575 * replace it with a weaker "the old value must be
1576 * this value we observed". If the remote ref has
1577 * moved and is now different from what we expect,
1578 * reject any push.
1579 *
1580 * It also is an error if the user told us to check
1581 * with the remote-tracking branch to find the value
1582 * to expect, but we did not have such a tracking
1583 * branch.
1584 */
1585 if (ref->expect_old_sha1) {
1586 if (ref->expect_old_no_trackback ||
1587 hashcmp(ref->old_sha1, ref->old_sha1_expect))
1588 reject_reason = REF_STATUS_REJECT_STALE;
1589 }
1590
1591 /*
1592 * The usual "must fast-forward" rules.
1593 *
1594 * Decide whether an individual refspec A:B can be
1595 * pushed. The push will succeed if any of the
1596 * following are true:
1597 *
1598 * (1) the remote reference B does not exist
1599 *
1600 * (2) the remote reference B is being removed (i.e.,
1601 * pushing :B where no source is specified)
1602 *
1603 * (3) the destination is not under refs/tags/, and
1604 * if the old and new value is a commit, the new
1605 * is a descendant of the old.
1606 *
1607 * (4) it is forced using the +A:B notation, or by
1608 * passing the --force argument
1609 */
1610
1611 else if (!ref->deletion && !is_null_sha1(ref->old_sha1)) {
1612 if (starts_with(ref->name, "refs/tags/"))
1613 reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
1614 else if (!has_sha1_file(ref->old_sha1))
1615 reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
1616 else if (!lookup_commit_reference_gently(ref->old_sha1, 1) ||
1617 !lookup_commit_reference_gently(ref->new_sha1, 1))
1618 reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
1619 else if (!ref_newer(ref->new_sha1, ref->old_sha1))
1620 reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
1621 }
1622
1623 /*
1624 * "--force" will defeat any rejection implemented
1625 * by the rules above.
1626 */
1627 if (!force_ref_update)
1628 ref->status = reject_reason;
1629 else if (reject_reason)
1630 ref->forced_update = 1;
1631 }
1632 }
1633
1634 static void set_merge(struct branch *ret)
1635 {
1636 char *ref;
1637 unsigned char sha1[20];
1638 int i;
1639
1640 ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
1641 for (i = 0; i < ret->merge_nr; i++) {
1642 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
1643 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
1644 if (!remote_find_tracking(ret->remote, ret->merge[i]) ||
1645 strcmp(ret->remote_name, "."))
1646 continue;
1647 if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
1648 sha1, &ref) == 1)
1649 ret->merge[i]->dst = ref;
1650 else
1651 ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
1652 }
1653 }
1654
1655 struct branch *branch_get(const char *name)
1656 {
1657 struct branch *ret;
1658
1659 read_config();
1660 if (!name || !*name || !strcmp(name, "HEAD"))
1661 ret = current_branch;
1662 else
1663 ret = make_branch(name, 0);
1664 if (ret && ret->remote_name) {
1665 ret->remote = remote_get(ret->remote_name);
1666 if (ret->merge_nr)
1667 set_merge(ret);
1668 }
1669 return ret;
1670 }
1671
1672 int branch_has_merge_config(struct branch *branch)
1673 {
1674 return branch && !!branch->merge;
1675 }
1676
1677 int branch_merge_matches(struct branch *branch,
1678 int i,
1679 const char *refname)
1680 {
1681 if (!branch || i < 0 || i >= branch->merge_nr)
1682 return 0;
1683 return refname_match(branch->merge[i]->src, refname);
1684 }
1685
1686 static int ignore_symref_update(const char *refname)
1687 {
1688 unsigned char sha1[20];
1689 int flag;
1690
1691 if (!resolve_ref_unsafe(refname, 0, sha1, &flag))
1692 return 0; /* non-existing refs are OK */
1693 return (flag & REF_ISSYMREF);
1694 }
1695
1696 /*
1697 * Create and return a list of (struct ref) consisting of copies of
1698 * each remote_ref that matches refspec. refspec must be a pattern.
1699 * Fill in the copies' peer_ref to describe the local tracking refs to
1700 * which they map. Omit any references that would map to an existing
1701 * local symbolic ref.
1702 */
1703 static struct ref *get_expanded_map(const struct ref *remote_refs,
1704 const struct refspec *refspec)
1705 {
1706 const struct ref *ref;
1707 struct ref *ret = NULL;
1708 struct ref **tail = &ret;
1709
1710 for (ref = remote_refs; ref; ref = ref->next) {
1711 char *expn_name = NULL;
1712
1713 if (strchr(ref->name, '^'))
1714 continue; /* a dereference item */
1715 if (match_name_with_pattern(refspec->src, ref->name,
1716 refspec->dst, &expn_name) &&
1717 !ignore_symref_update(expn_name)) {
1718 struct ref *cpy = copy_ref(ref);
1719
1720 cpy->peer_ref = alloc_ref(expn_name);
1721 if (refspec->force)
1722 cpy->peer_ref->force = 1;
1723 *tail = cpy;
1724 tail = &cpy->next;
1725 }
1726 free(expn_name);
1727 }
1728
1729 return ret;
1730 }
1731
1732 static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
1733 {
1734 const struct ref *ref;
1735 for (ref = refs; ref; ref = ref->next) {
1736 if (refname_match(name, ref->name))
1737 return ref;
1738 }
1739 return NULL;
1740 }
1741
1742 struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
1743 {
1744 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
1745
1746 if (!ref)
1747 return NULL;
1748
1749 return copy_ref(ref);
1750 }
1751
1752 static struct ref *get_local_ref(const char *name)
1753 {
1754 if (!name || name[0] == '\0')
1755 return NULL;
1756
1757 if (starts_with(name, "refs/"))
1758 return alloc_ref(name);
1759
1760 if (starts_with(name, "heads/") ||
1761 starts_with(name, "tags/") ||
1762 starts_with(name, "remotes/"))
1763 return alloc_ref_with_prefix("refs/", 5, name);
1764
1765 return alloc_ref_with_prefix("refs/heads/", 11, name);
1766 }
1767
1768 int get_fetch_map(const struct ref *remote_refs,
1769 const struct refspec *refspec,
1770 struct ref ***tail,
1771 int missing_ok)
1772 {
1773 struct ref *ref_map, **rmp;
1774
1775 if (refspec->pattern) {
1776 ref_map = get_expanded_map(remote_refs, refspec);
1777 } else {
1778 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1779
1780 if (refspec->exact_sha1) {
1781 ref_map = alloc_ref(name);
1782 get_sha1_hex(name, ref_map->old_sha1);
1783 } else {
1784 ref_map = get_remote_ref(remote_refs, name);
1785 }
1786 if (!missing_ok && !ref_map)
1787 die("Couldn't find remote ref %s", name);
1788 if (ref_map) {
1789 ref_map->peer_ref = get_local_ref(refspec->dst);
1790 if (ref_map->peer_ref && refspec->force)
1791 ref_map->peer_ref->force = 1;
1792 }
1793 }
1794
1795 for (rmp = &ref_map; *rmp; ) {
1796 if ((*rmp)->peer_ref) {
1797 if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
1798 check_refname_format((*rmp)->peer_ref->name, 0)) {
1799 struct ref *ignore = *rmp;
1800 error("* Ignoring funny ref '%s' locally",
1801 (*rmp)->peer_ref->name);
1802 *rmp = (*rmp)->next;
1803 free(ignore->peer_ref);
1804 free(ignore);
1805 continue;
1806 }
1807 }
1808 rmp = &((*rmp)->next);
1809 }
1810
1811 if (ref_map)
1812 tail_link_ref(ref_map, tail);
1813
1814 return 0;
1815 }
1816
1817 int resolve_remote_symref(struct ref *ref, struct ref *list)
1818 {
1819 if (!ref->symref)
1820 return 0;
1821 for (; list; list = list->next)
1822 if (!strcmp(ref->symref, list->name)) {
1823 hashcpy(ref->old_sha1, list->old_sha1);
1824 return 0;
1825 }
1826 return 1;
1827 }
1828
1829 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1830 {
1831 while (list) {
1832 struct commit_list *temp = list;
1833 temp->item->object.flags &= ~mark;
1834 list = temp->next;
1835 free(temp);
1836 }
1837 }
1838
1839 int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
1840 {
1841 struct object *o;
1842 struct commit *old, *new;
1843 struct commit_list *list, *used;
1844 int found = 0;
1845
1846 /*
1847 * Both new and old must be commit-ish and new is descendant of
1848 * old. Otherwise we require --force.
1849 */
1850 o = deref_tag(parse_object(old_sha1), NULL, 0);
1851 if (!o || o->type != OBJ_COMMIT)
1852 return 0;
1853 old = (struct commit *) o;
1854
1855 o = deref_tag(parse_object(new_sha1), NULL, 0);
1856 if (!o || o->type != OBJ_COMMIT)
1857 return 0;
1858 new = (struct commit *) o;
1859
1860 if (parse_commit(new) < 0)
1861 return 0;
1862
1863 used = list = NULL;
1864 commit_list_insert(new, &list);
1865 while (list) {
1866 new = pop_most_recent_commit(&list, TMP_MARK);
1867 commit_list_insert(new, &used);
1868 if (new == old) {
1869 found = 1;
1870 break;
1871 }
1872 }
1873 unmark_and_free(list, TMP_MARK);
1874 unmark_and_free(used, TMP_MARK);
1875 return found;
1876 }
1877
1878 /*
1879 * Compare a branch with its upstream, and save their differences (number
1880 * of commits) in *num_ours and *num_theirs.
1881 *
1882 * Return 0 if branch has no upstream (no base), -1 if upstream is missing
1883 * (with "gone" base), otherwise 1 (with base).
1884 */
1885 int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
1886 {
1887 unsigned char sha1[20];
1888 struct commit *ours, *theirs;
1889 char symmetric[84];
1890 struct rev_info revs;
1891 const char *rev_argv[10], *base;
1892 int rev_argc;
1893
1894 /* Cannot stat unless we are marked to build on top of somebody else. */
1895 if (!branch ||
1896 !branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
1897 return 0;
1898
1899 /* Cannot stat if what we used to build on no longer exists */
1900 base = branch->merge[0]->dst;
1901 if (read_ref(base, sha1))
1902 return -1;
1903 theirs = lookup_commit_reference(sha1);
1904 if (!theirs)
1905 return -1;
1906
1907 if (read_ref(branch->refname, sha1))
1908 return -1;
1909 ours = lookup_commit_reference(sha1);
1910 if (!ours)
1911 return -1;
1912
1913 /* are we the same? */
1914 if (theirs == ours) {
1915 *num_theirs = *num_ours = 0;
1916 return 1;
1917 }
1918
1919 /* Run "rev-list --left-right ours...theirs" internally... */
1920 rev_argc = 0;
1921 rev_argv[rev_argc++] = NULL;
1922 rev_argv[rev_argc++] = "--left-right";
1923 rev_argv[rev_argc++] = symmetric;
1924 rev_argv[rev_argc++] = "--";
1925 rev_argv[rev_argc] = NULL;
1926
1927 strcpy(symmetric, sha1_to_hex(ours->object.sha1));
1928 strcpy(symmetric + 40, "...");
1929 strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
1930
1931 init_revisions(&revs, NULL);
1932 setup_revisions(rev_argc, rev_argv, &revs, NULL);
1933 if (prepare_revision_walk(&revs))
1934 die("revision walk setup failed");
1935
1936 /* ... and count the commits on each side. */
1937 *num_ours = 0;
1938 *num_theirs = 0;
1939 while (1) {
1940 struct commit *c = get_revision(&revs);
1941 if (!c)
1942 break;
1943 if (c->object.flags & SYMMETRIC_LEFT)
1944 (*num_ours)++;
1945 else
1946 (*num_theirs)++;
1947 }
1948
1949 /* clear object flags smudged by the above traversal */
1950 clear_commit_marks(ours, ALL_REV_FLAGS);
1951 clear_commit_marks(theirs, ALL_REV_FLAGS);
1952 return 1;
1953 }
1954
1955 /*
1956 * Return true when there is anything to report, otherwise false.
1957 */
1958 int format_tracking_info(struct branch *branch, struct strbuf *sb)
1959 {
1960 int ours, theirs;
1961 char *base;
1962 int upstream_is_gone = 0;
1963
1964 switch (stat_tracking_info(branch, &ours, &theirs)) {
1965 case 0:
1966 /* no base */
1967 return 0;
1968 case -1:
1969 /* with "gone" base */
1970 upstream_is_gone = 1;
1971 break;
1972 default:
1973 /* with base */
1974 break;
1975 }
1976
1977 base = shorten_unambiguous_ref(branch->merge[0]->dst, 0);
1978 if (upstream_is_gone) {
1979 strbuf_addf(sb,
1980 _("Your branch is based on '%s', but the upstream is gone.\n"),
1981 base);
1982 if (advice_status_hints)
1983 strbuf_addf(sb,
1984 _(" (use \"git branch --unset-upstream\" to fixup)\n"));
1985 } else if (!ours && !theirs) {
1986 strbuf_addf(sb,
1987 _("Your branch is up-to-date with '%s'.\n"),
1988 base);
1989 } else if (!theirs) {
1990 strbuf_addf(sb,
1991 Q_("Your branch is ahead of '%s' by %d commit.\n",
1992 "Your branch is ahead of '%s' by %d commits.\n",
1993 ours),
1994 base, ours);
1995 if (advice_status_hints)
1996 strbuf_addf(sb,
1997 _(" (use \"git push\" to publish your local commits)\n"));
1998 } else if (!ours) {
1999 strbuf_addf(sb,
2000 Q_("Your branch is behind '%s' by %d commit, "
2001 "and can be fast-forwarded.\n",
2002 "Your branch is behind '%s' by %d commits, "
2003 "and can be fast-forwarded.\n",
2004 theirs),
2005 base, theirs);
2006 if (advice_status_hints)
2007 strbuf_addf(sb,
2008 _(" (use \"git pull\" to update your local branch)\n"));
2009 } else {
2010 strbuf_addf(sb,
2011 Q_("Your branch and '%s' have diverged,\n"
2012 "and have %d and %d different commit each, "
2013 "respectively.\n",
2014 "Your branch and '%s' have diverged,\n"
2015 "and have %d and %d different commits each, "
2016 "respectively.\n",
2017 theirs),
2018 base, ours, theirs);
2019 if (advice_status_hints)
2020 strbuf_addf(sb,
2021 _(" (use \"git pull\" to merge the remote branch into yours)\n"));
2022 }
2023 free(base);
2024 return 1;
2025 }
2026
2027 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
2028 {
2029 struct ref ***local_tail = cb_data;
2030 struct ref *ref;
2031 int len;
2032
2033 /* we already know it starts with refs/ to get here */
2034 if (check_refname_format(refname + 5, 0))
2035 return 0;
2036
2037 len = strlen(refname) + 1;
2038 ref = xcalloc(1, sizeof(*ref) + len);
2039 hashcpy(ref->new_sha1, sha1);
2040 memcpy(ref->name, refname, len);
2041 **local_tail = ref;
2042 *local_tail = &ref->next;
2043 return 0;
2044 }
2045
2046 struct ref *get_local_heads(void)
2047 {
2048 struct ref *local_refs = NULL, **local_tail = &local_refs;
2049 struct each_ref_fn_sha1_adapter wrapped_one_local_ref =
2050 {one_local_ref, &local_tail};
2051
2052 for_each_ref(each_ref_fn_adapter, &wrapped_one_local_ref);
2053 return local_refs;
2054 }
2055
2056 struct ref *guess_remote_head(const struct ref *head,
2057 const struct ref *refs,
2058 int all)
2059 {
2060 const struct ref *r;
2061 struct ref *list = NULL;
2062 struct ref **tail = &list;
2063
2064 if (!head)
2065 return NULL;
2066
2067 /*
2068 * Some transports support directly peeking at
2069 * where HEAD points; if that is the case, then
2070 * we don't have to guess.
2071 */
2072 if (head->symref)
2073 return copy_ref(find_ref_by_name(refs, head->symref));
2074
2075 /* If refs/heads/master could be right, it is. */
2076 if (!all) {
2077 r = find_ref_by_name(refs, "refs/heads/master");
2078 if (r && !hashcmp(r->old_sha1, head->old_sha1))
2079 return copy_ref(r);
2080 }
2081
2082 /* Look for another ref that points there */
2083 for (r = refs; r; r = r->next) {
2084 if (r != head &&
2085 starts_with(r->name, "refs/heads/") &&
2086 !hashcmp(r->old_sha1, head->old_sha1)) {
2087 *tail = copy_ref(r);
2088 tail = &((*tail)->next);
2089 if (!all)
2090 break;
2091 }
2092 }
2093
2094 return list;
2095 }
2096
2097 struct stale_heads_info {
2098 struct string_list *ref_names;
2099 struct ref **stale_refs_tail;
2100 struct refspec *refs;
2101 int ref_count;
2102 };
2103
2104 static int get_stale_heads_cb(const char *refname,
2105 const unsigned char *sha1, int flags, void *cb_data)
2106 {
2107 struct stale_heads_info *info = cb_data;
2108 struct string_list matches = STRING_LIST_INIT_DUP;
2109 struct refspec query;
2110 int i, stale = 1;
2111 memset(&query, 0, sizeof(struct refspec));
2112 query.dst = (char *)refname;
2113
2114 query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
2115 if (matches.nr == 0)
2116 goto clean_exit; /* No matches */
2117
2118 /*
2119 * If we did find a suitable refspec and it's not a symref and
2120 * it's not in the list of refs that currently exist in that
2121 * remote, we consider it to be stale. In order to deal with
2122 * overlapping refspecs, we need to go over all of the
2123 * matching refs.
2124 */
2125 if (flags & REF_ISSYMREF)
2126 goto clean_exit;
2127
2128 for (i = 0; stale && i < matches.nr; i++)
2129 if (string_list_has_string(info->ref_names, matches.items[i].string))
2130 stale = 0;
2131
2132 if (stale) {
2133 struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
2134 hashcpy(ref->new_sha1, sha1);
2135 }
2136
2137 clean_exit:
2138 string_list_clear(&matches, 0);
2139 return 0;
2140 }
2141
2142 struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
2143 {
2144 struct ref *ref, *stale_refs = NULL;
2145 struct string_list ref_names = STRING_LIST_INIT_NODUP;
2146 struct stale_heads_info info;
2147 struct each_ref_fn_sha1_adapter wrapped_get_stale_heads_cb =
2148 {get_stale_heads_cb, &info};
2149
2150 info.ref_names = &ref_names;
2151 info.stale_refs_tail = &stale_refs;
2152 info.refs = refs;
2153 info.ref_count = ref_count;
2154 for (ref = fetch_map; ref; ref = ref->next)
2155 string_list_append(&ref_names, ref->name);
2156 string_list_sort(&ref_names);
2157 for_each_ref(each_ref_fn_adapter, &wrapped_get_stale_heads_cb);
2158 string_list_clear(&ref_names, 0);
2159 return stale_refs;
2160 }
2161
2162 /*
2163 * Compare-and-swap
2164 */
2165 static void clear_cas_option(struct push_cas_option *cas)
2166 {
2167 int i;
2168
2169 for (i = 0; i < cas->nr; i++)
2170 free(cas->entry[i].refname);
2171 free(cas->entry);
2172 memset(cas, 0, sizeof(*cas));
2173 }
2174
2175 static struct push_cas *add_cas_entry(struct push_cas_option *cas,
2176 const char *refname,
2177 size_t refnamelen)
2178 {
2179 struct push_cas *entry;
2180 ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
2181 entry = &cas->entry[cas->nr++];
2182 memset(entry, 0, sizeof(*entry));
2183 entry->refname = xmemdupz(refname, refnamelen);
2184 return entry;
2185 }
2186
2187 int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
2188 {
2189 const char *colon;
2190 struct push_cas *entry;
2191
2192 if (unset) {
2193 /* "--no-<option>" */
2194 clear_cas_option(cas);
2195 return 0;
2196 }
2197
2198 if (!arg) {
2199 /* just "--<option>" */
2200 cas->use_tracking_for_rest = 1;
2201 return 0;
2202 }
2203
2204 /* "--<option>=refname" or "--<option>=refname:value" */
2205 colon = strchrnul(arg, ':');
2206 entry = add_cas_entry(cas, arg, colon - arg);
2207 if (!*colon)
2208 entry->use_tracking = 1;
2209 else if (get_sha1(colon + 1, entry->expect))
2210 return error("cannot parse expected object name '%s'", colon + 1);
2211 return 0;
2212 }
2213
2214 int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
2215 {
2216 return parse_push_cas_option(opt->value, arg, unset);
2217 }
2218
2219 int is_empty_cas(const struct push_cas_option *cas)
2220 {
2221 return !cas->use_tracking_for_rest && !cas->nr;
2222 }
2223
2224 /*
2225 * Look at remote.fetch refspec and see if we have a remote
2226 * tracking branch for the refname there. Fill its current
2227 * value in sha1[].
2228 * If we cannot do so, return negative to signal an error.
2229 */
2230 static int remote_tracking(struct remote *remote, const char *refname,
2231 unsigned char sha1[20])
2232 {
2233 char *dst;
2234
2235 dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
2236 if (!dst)
2237 return -1; /* no tracking ref for refname at remote */
2238 if (read_ref(dst, sha1))
2239 return -1; /* we know what the tracking ref is but we cannot read it */
2240 return 0;
2241 }
2242
2243 static void apply_cas(struct push_cas_option *cas,
2244 struct remote *remote,
2245 struct ref *ref)
2246 {
2247 int i;
2248
2249 /* Find an explicit --<option>=<name>[:<value>] entry */
2250 for (i = 0; i < cas->nr; i++) {
2251 struct push_cas *entry = &cas->entry[i];
2252 if (!refname_match(entry->refname, ref->name))
2253 continue;
2254 ref->expect_old_sha1 = 1;
2255 if (!entry->use_tracking)
2256 hashcpy(ref->old_sha1_expect, cas->entry[i].expect);
2257 else if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2258 ref->expect_old_no_trackback = 1;
2259 return;
2260 }
2261
2262 /* Are we using "--<option>" to cover all? */
2263 if (!cas->use_tracking_for_rest)
2264 return;
2265
2266 ref->expect_old_sha1 = 1;
2267 if (remote_tracking(remote, ref->name, ref->old_sha1_expect))
2268 ref->expect_old_no_trackback = 1;
2269 }
2270
2271 void apply_push_cas(struct push_cas_option *cas,
2272 struct remote *remote,
2273 struct ref *remote_refs)
2274 {
2275 struct ref *ref;
2276 for (ref = remote_refs; ref; ref = ref->next)
2277 apply_cas(cas, remote, ref);
2278 }
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