fast-import: Document the effect of "merge" with no "from" in a commit
[git/git.git] / remote.c
CommitLineData
5751f490
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1#include "cache.h"
2#include "remote.h"
3#include "refs.h"
4
844112ca
JH
5struct counted_string {
6 size_t len;
7 const char *s;
8};
55029ae4
DB
9struct rewrite {
10 const char *base;
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11 size_t baselen;
12 struct counted_string *instead_of;
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13 int instead_of_nr;
14 int instead_of_alloc;
15};
16
5751f490 17static struct remote **remotes;
2d31347b
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18static int remotes_alloc;
19static int remotes_nr;
5751f490 20
cf818348 21static struct branch **branches;
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DB
22static int branches_alloc;
23static int branches_nr;
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24
25static struct branch *current_branch;
26static const char *default_remote_name;
27
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28static struct rewrite **rewrite;
29static int rewrite_alloc;
30static int rewrite_nr;
31
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32#define BUF_SIZE (2048)
33static char buffer[BUF_SIZE];
34
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35static const char *alias_url(const char *url)
36{
37 int i, j;
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38 char *ret;
39 struct counted_string *longest;
40 int longest_i;
41
42 longest = NULL;
43 longest_i = -1;
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DB
44 for (i = 0; i < rewrite_nr; i++) {
45 if (!rewrite[i])
46 continue;
47 for (j = 0; j < rewrite[i]->instead_of_nr; j++) {
844112ca
JH
48 if (!prefixcmp(url, rewrite[i]->instead_of[j].s) &&
49 (!longest ||
50 longest->len < rewrite[i]->instead_of[j].len)) {
51 longest = &(rewrite[i]->instead_of[j]);
52 longest_i = i;
55029ae4
DB
53 }
54 }
55 }
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56 if (!longest)
57 return url;
58
59 ret = malloc(rewrite[longest_i]->baselen +
60 (strlen(url) - longest->len) + 1);
61 strcpy(ret, rewrite[longest_i]->base);
62 strcpy(ret + rewrite[longest_i]->baselen, url + longest->len);
63 return ret;
55029ae4
DB
64}
65
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66static void add_push_refspec(struct remote *remote, const char *ref)
67{
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68 ALLOC_GROW(remote->push_refspec,
69 remote->push_refspec_nr + 1,
70 remote->push_refspec_alloc);
71 remote->push_refspec[remote->push_refspec_nr++] = ref;
5751f490
DB
72}
73
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74static void add_fetch_refspec(struct remote *remote, const char *ref)
75{
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76 ALLOC_GROW(remote->fetch_refspec,
77 remote->fetch_refspec_nr + 1,
78 remote->fetch_refspec_alloc);
79 remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
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DB
80}
81
28b91f8a 82static void add_url(struct remote *remote, const char *url)
5751f490 83{
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DB
84 ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
85 remote->url[remote->url_nr++] = url;
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DB
86}
87
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88static void add_url_alias(struct remote *remote, const char *url)
89{
90 add_url(remote, alias_url(url));
91}
92
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93static struct remote *make_remote(const char *name, int len)
94{
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95 struct remote *ret;
96 int i;
5751f490 97
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DB
98 for (i = 0; i < remotes_nr; i++) {
99 if (len ? (!strncmp(name, remotes[i]->name, len) &&
100 !remotes[i]->name[len]) :
101 !strcmp(name, remotes[i]->name))
102 return remotes[i];
5751f490
DB
103 }
104
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105 ret = xcalloc(1, sizeof(struct remote));
106 ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
107 remotes[remotes_nr++] = ret;
5751f490 108 if (len)
2d31347b 109 ret->name = xstrndup(name, len);
5751f490 110 else
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111 ret->name = xstrdup(name);
112 return ret;
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113}
114
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115static void add_merge(struct branch *branch, const char *name)
116{
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117 ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
118 branch->merge_alloc);
119 branch->merge_name[branch->merge_nr++] = name;
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120}
121
122static struct branch *make_branch(const char *name, int len)
123{
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124 struct branch *ret;
125 int i;
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126 char *refname;
127
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128 for (i = 0; i < branches_nr; i++) {
129 if (len ? (!strncmp(name, branches[i]->name, len) &&
130 !branches[i]->name[len]) :
131 !strcmp(name, branches[i]->name))
132 return branches[i];
cf818348
DB
133 }
134
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135 ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
136 ret = xcalloc(1, sizeof(struct branch));
137 branches[branches_nr++] = ret;
cf818348 138 if (len)
2d31347b 139 ret->name = xstrndup(name, len);
cf818348 140 else
2d31347b 141 ret->name = xstrdup(name);
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142 refname = malloc(strlen(name) + strlen("refs/heads/") + 1);
143 strcpy(refname, "refs/heads/");
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144 strcpy(refname + strlen("refs/heads/"), ret->name);
145 ret->refname = refname;
cf818348 146
2d31347b 147 return ret;
cf818348
DB
148}
149
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150static struct rewrite *make_rewrite(const char *base, int len)
151{
152 struct rewrite *ret;
153 int i;
154
155 for (i = 0; i < rewrite_nr; i++) {
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156 if (len
157 ? (len == rewrite[i]->baselen &&
158 !strncmp(base, rewrite[i]->base, len))
159 : !strcmp(base, rewrite[i]->base))
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160 return rewrite[i];
161 }
162
163 ALLOC_GROW(rewrite, rewrite_nr + 1, rewrite_alloc);
164 ret = xcalloc(1, sizeof(struct rewrite));
165 rewrite[rewrite_nr++] = ret;
844112ca 166 if (len) {
55029ae4 167 ret->base = xstrndup(base, len);
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168 ret->baselen = len;
169 }
170 else {
55029ae4 171 ret->base = xstrdup(base);
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172 ret->baselen = strlen(base);
173 }
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174 return ret;
175}
176
177static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
178{
179 ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
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180 rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
181 rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
182 rewrite->instead_of_nr++;
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183}
184
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185static void read_remotes_file(struct remote *remote)
186{
187 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
188
189 if (!f)
190 return;
191 while (fgets(buffer, BUF_SIZE, f)) {
192 int value_list;
193 char *s, *p;
194
195 if (!prefixcmp(buffer, "URL:")) {
196 value_list = 0;
197 s = buffer + 4;
198 } else if (!prefixcmp(buffer, "Push:")) {
199 value_list = 1;
200 s = buffer + 5;
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201 } else if (!prefixcmp(buffer, "Pull:")) {
202 value_list = 2;
203 s = buffer + 5;
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204 } else
205 continue;
206
207 while (isspace(*s))
208 s++;
209 if (!*s)
210 continue;
211
212 p = s + strlen(s);
213 while (isspace(p[-1]))
214 *--p = 0;
215
216 switch (value_list) {
217 case 0:
55029ae4 218 add_url_alias(remote, xstrdup(s));
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219 break;
220 case 1:
221 add_push_refspec(remote, xstrdup(s));
222 break;
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223 case 2:
224 add_fetch_refspec(remote, xstrdup(s));
225 break;
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226 }
227 }
228 fclose(f);
229}
230
231static void read_branches_file(struct remote *remote)
232{
233 const char *slash = strchr(remote->name, '/');
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234 char *frag;
235 char *branch;
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236 int n = slash ? slash - remote->name : 1000;
237 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
238 char *s, *p;
239 int len;
240
241 if (!f)
242 return;
243 s = fgets(buffer, BUF_SIZE, f);
244 fclose(f);
245 if (!s)
246 return;
247 while (isspace(*s))
248 s++;
249 if (!*s)
250 return;
251 p = s + strlen(s);
252 while (isspace(p[-1]))
253 *--p = 0;
254 len = p - s;
255 if (slash)
256 len += strlen(slash);
257 p = xmalloc(len + 1);
258 strcpy(p, s);
259 if (slash)
260 strcat(p, slash);
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261 frag = strchr(p, '#');
262 if (frag) {
263 *(frag++) = '\0';
264 branch = xmalloc(strlen(frag) + 12);
265 strcpy(branch, "refs/heads/");
266 strcat(branch, frag);
267 } else {
268 branch = "refs/heads/master";
269 }
55029ae4 270 add_url_alias(remote, p);
cf818348 271 add_fetch_refspec(remote, branch);
d71ab174 272 remote->fetch_tags = 1; /* always auto-follow */
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273}
274
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275static int handle_config(const char *key, const char *value)
276{
277 const char *name;
278 const char *subkey;
279 struct remote *remote;
cf818348
DB
280 struct branch *branch;
281 if (!prefixcmp(key, "branch.")) {
282 name = key + 7;
283 subkey = strrchr(name, '.');
cf818348
DB
284 if (!subkey)
285 return 0;
896c0535 286 branch = make_branch(name, subkey - name);
cf818348 287 if (!strcmp(subkey, ".remote")) {
d2370cc2
JH
288 if (!value)
289 return config_error_nonbool(key);
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DB
290 branch->remote_name = xstrdup(value);
291 if (branch == current_branch)
292 default_remote_name = branch->remote_name;
d2370cc2
JH
293 } else if (!strcmp(subkey, ".merge")) {
294 if (!value)
295 return config_error_nonbool(key);
cf818348 296 add_merge(branch, xstrdup(value));
d2370cc2 297 }
cf818348 298 return 0;
5751f490 299 }
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DB
300 if (!prefixcmp(key, "url.")) {
301 struct rewrite *rewrite;
302 name = key + 5;
303 subkey = strrchr(name, '.');
304 if (!subkey)
305 return 0;
306 rewrite = make_rewrite(name, subkey - name);
307 if (!strcmp(subkey, ".insteadof")) {
308 if (!value)
309 return config_error_nonbool(key);
310 add_instead_of(rewrite, xstrdup(value));
311 }
312 }
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DB
313 if (prefixcmp(key, "remote."))
314 return 0;
315 name = key + 7;
316 subkey = strrchr(name, '.');
317 if (!subkey)
318 return error("Config with no key for remote %s", name);
319 if (*subkey == '/') {
320 warning("Config remote shorthand cannot begin with '/': %s", name);
321 return 0;
322 }
323 remote = make_remote(name, subkey - name);
324 if (!value) {
325 /* if we ever have a boolean variable, e.g. "remote.*.disabled"
326 * [remote "frotz"]
327 * disabled
328 * is a valid way to set it to true; we get NULL in value so
329 * we need to handle it here.
330 *
331 * if (!strcmp(subkey, ".disabled")) {
332 * val = git_config_bool(key, value);
333 * return 0;
334 * } else
335 *
336 */
337 return 0; /* ignore unknown booleans */
338 }
339 if (!strcmp(subkey, ".url")) {
28b91f8a 340 add_url(remote, xstrdup(value));
5751f490
DB
341 } else if (!strcmp(subkey, ".push")) {
342 add_push_refspec(remote, xstrdup(value));
5d46c9d4
DB
343 } else if (!strcmp(subkey, ".fetch")) {
344 add_fetch_refspec(remote, xstrdup(value));
5751f490
DB
345 } else if (!strcmp(subkey, ".receivepack")) {
346 if (!remote->receivepack)
347 remote->receivepack = xstrdup(value);
348 else
349 error("more than one receivepack given, using the first");
0012ba21
DB
350 } else if (!strcmp(subkey, ".uploadpack")) {
351 if (!remote->uploadpack)
352 remote->uploadpack = xstrdup(value);
353 else
354 error("more than one uploadpack given, using the first");
d71ab174
DB
355 } else if (!strcmp(subkey, ".tagopt")) {
356 if (!strcmp(value, "--no-tags"))
357 remote->fetch_tags = -1;
14c98218
SV
358 } else if (!strcmp(subkey, ".proxy")) {
359 remote->http_proxy = xstrdup(value);
211c8968
JS
360 } else if (!strcmp(subkey, ".skipdefaultupdate"))
361 remote->skip_default_update = 1;
5751f490
DB
362 return 0;
363}
364
55029ae4
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365static void alias_all_urls(void)
366{
367 int i, j;
368 for (i = 0; i < remotes_nr; i++) {
369 if (!remotes[i])
370 continue;
371 for (j = 0; j < remotes[i]->url_nr; j++) {
372 remotes[i]->url[j] = alias_url(remotes[i]->url[j]);
373 }
374 }
375}
376
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377static void read_config(void)
378{
379 unsigned char sha1[20];
380 const char *head_ref;
381 int flag;
382 if (default_remote_name) // did this already
383 return;
384 default_remote_name = xstrdup("origin");
385 current_branch = NULL;
386 head_ref = resolve_ref("HEAD", sha1, 0, &flag);
387 if (head_ref && (flag & REF_ISSYMREF) &&
388 !prefixcmp(head_ref, "refs/heads/")) {
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DB
389 current_branch =
390 make_branch(head_ref + strlen("refs/heads/"), 0);
5751f490
DB
391 }
392 git_config(handle_config);
55029ae4 393 alias_all_urls();
5751f490
DB
394}
395
d71ab174 396struct refspec *parse_ref_spec(int nr_refspec, const char **refspec)
6b62816c
DB
397{
398 int i;
ef00d150 399 int st;
6b62816c
DB
400 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
401 for (i = 0; i < nr_refspec; i++) {
402 const char *sp, *ep, *gp;
403 sp = refspec[i];
404 if (*sp == '+') {
405 rs[i].force = 1;
406 sp++;
407 }
ef00d150 408 gp = strstr(sp, "/*");
6b62816c
DB
409 ep = strchr(sp, ':');
410 if (gp && ep && gp > ep)
411 gp = NULL;
412 if (ep) {
413 if (ep[1]) {
ef00d150
DB
414 const char *glob = strstr(ep + 1, "/*");
415 if (glob && glob[2])
416 glob = NULL;
6b62816c
DB
417 if (!glob)
418 gp = NULL;
419 if (gp)
420 rs[i].dst = xstrndup(ep + 1,
421 glob - ep - 1);
422 else
423 rs[i].dst = xstrdup(ep + 1);
424 }
425 } else {
426 ep = sp + strlen(sp);
427 }
ef00d150
DB
428 if (gp && gp + 2 != ep)
429 gp = NULL;
6b62816c
DB
430 if (gp) {
431 rs[i].pattern = 1;
432 ep = gp;
433 }
434 rs[i].src = xstrndup(sp, ep - sp);
ef00d150
DB
435
436 if (*rs[i].src) {
437 st = check_ref_format(rs[i].src);
438 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
439 die("Invalid refspec '%s'", refspec[i]);
440 }
441 if (rs[i].dst && *rs[i].dst) {
442 st = check_ref_format(rs[i].dst);
443 if (st && st != CHECK_REF_FORMAT_ONELEVEL)
444 die("Invalid refspec '%s'", refspec[i]);
445 }
6b62816c
DB
446 }
447 return rs;
448}
449
df93e33c
DB
450static int valid_remote_nick(const char *name)
451{
452 if (!name[0] || /* not empty */
453 (name[0] == '.' && /* not "." */
454 (!name[1] || /* not ".." */
455 (name[1] == '.' && !name[2]))))
456 return 0;
457 return !strchr(name, '/'); /* no slash */
458}
459
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DB
460struct remote *remote_get(const char *name)
461{
462 struct remote *ret;
463
464 read_config();
465 if (!name)
466 name = default_remote_name;
467 ret = make_remote(name, 0);
df93e33c 468 if (valid_remote_nick(name)) {
28b91f8a 469 if (!ret->url)
5751f490 470 read_remotes_file(ret);
28b91f8a 471 if (!ret->url)
5751f490
DB
472 read_branches_file(ret);
473 }
28b91f8a 474 if (!ret->url)
55029ae4 475 add_url_alias(ret, name);
28b91f8a 476 if (!ret->url)
5751f490 477 return NULL;
5d46c9d4 478 ret->fetch = parse_ref_spec(ret->fetch_refspec_nr, ret->fetch_refspec);
6b62816c 479 ret->push = parse_ref_spec(ret->push_refspec_nr, ret->push_refspec);
5751f490
DB
480 return ret;
481}
6b62816c 482
b42f6927
JS
483int for_each_remote(each_remote_fn fn, void *priv)
484{
485 int i, result = 0;
486 read_config();
2d31347b 487 for (i = 0; i < remotes_nr && !result; i++) {
b42f6927
JS
488 struct remote *r = remotes[i];
489 if (!r)
490 continue;
491 if (!r->fetch)
492 r->fetch = parse_ref_spec(r->fetch_refspec_nr,
493 r->fetch_refspec);
494 if (!r->push)
495 r->push = parse_ref_spec(r->push_refspec_nr,
496 r->push_refspec);
497 result = fn(r, priv);
498 }
499 return result;
500}
501
2467a4fa
DB
502void ref_remove_duplicates(struct ref *ref_map)
503{
504 struct ref **posn;
505 struct ref *next;
506 for (; ref_map; ref_map = ref_map->next) {
507 if (!ref_map->peer_ref)
508 continue;
509 posn = &ref_map->next;
510 while (*posn) {
511 if ((*posn)->peer_ref &&
512 !strcmp((*posn)->peer_ref->name,
513 ref_map->peer_ref->name)) {
514 if (strcmp((*posn)->name, ref_map->name))
515 die("%s tracks both %s and %s",
516 ref_map->peer_ref->name,
517 (*posn)->name, ref_map->name);
518 next = (*posn)->next;
519 free((*posn)->peer_ref);
520 free(*posn);
521 *posn = next;
522 } else {
523 posn = &(*posn)->next;
524 }
525 }
526 }
527}
528
28b91f8a 529int remote_has_url(struct remote *remote, const char *url)
5d46c9d4
DB
530{
531 int i;
28b91f8a
SP
532 for (i = 0; i < remote->url_nr; i++) {
533 if (!strcmp(remote->url[i], url))
5d46c9d4
DB
534 return 1;
535 }
536 return 0;
537}
538
539int remote_find_tracking(struct remote *remote, struct refspec *refspec)
540{
b42f6927
JS
541 int find_src = refspec->src == NULL;
542 char *needle, **result;
5d46c9d4 543 int i;
b42f6927
JS
544
545 if (find_src) {
009c5bcd 546 if (!refspec->dst)
b42f6927
JS
547 return error("find_tracking: need either src or dst");
548 needle = refspec->dst;
549 result = &refspec->src;
550 } else {
551 needle = refspec->src;
552 result = &refspec->dst;
553 }
554
5d46c9d4
DB
555 for (i = 0; i < remote->fetch_refspec_nr; i++) {
556 struct refspec *fetch = &remote->fetch[i];
b42f6927
JS
557 const char *key = find_src ? fetch->dst : fetch->src;
558 const char *value = find_src ? fetch->src : fetch->dst;
5d46c9d4
DB
559 if (!fetch->dst)
560 continue;
561 if (fetch->pattern) {
ef00d150
DB
562 if (!prefixcmp(needle, key) &&
563 needle[strlen(key)] == '/') {
b42f6927
JS
564 *result = xmalloc(strlen(value) +
565 strlen(needle) -
566 strlen(key) + 1);
567 strcpy(*result, value);
568 strcpy(*result + strlen(value),
569 needle + strlen(key));
5d46c9d4
DB
570 refspec->force = fetch->force;
571 return 0;
572 }
b42f6927
JS
573 } else if (!strcmp(needle, key)) {
574 *result = xstrdup(value);
575 refspec->force = fetch->force;
576 return 0;
5d46c9d4
DB
577 }
578 }
5d46c9d4
DB
579 return -1;
580}
581
dfd255dd
DB
582struct ref *alloc_ref(unsigned namelen)
583{
584 struct ref *ret = xmalloc(sizeof(struct ref) + namelen);
585 memset(ret, 0, sizeof(struct ref) + namelen);
586 return ret;
587}
588
4577370e 589static struct ref *copy_ref(const struct ref *ref)
d71ab174
DB
590{
591 struct ref *ret = xmalloc(sizeof(struct ref) + strlen(ref->name) + 1);
592 memcpy(ret, ref, sizeof(struct ref) + strlen(ref->name) + 1);
593 ret->next = NULL;
594 return ret;
595}
596
4577370e
DB
597struct ref *copy_ref_list(const struct ref *ref)
598{
599 struct ref *ret = NULL;
600 struct ref **tail = &ret;
601 while (ref) {
602 *tail = copy_ref(ref);
603 ref = ref->next;
604 tail = &((*tail)->next);
605 }
606 return ret;
607}
608
dfd255dd
DB
609void free_refs(struct ref *ref)
610{
611 struct ref *next;
612 while (ref) {
613 next = ref->next;
8e0f7003 614 free(ref->peer_ref);
dfd255dd
DB
615 free(ref);
616 ref = next;
617 }
618}
619
6b62816c
DB
620static int count_refspec_match(const char *pattern,
621 struct ref *refs,
622 struct ref **matched_ref)
623{
624 int patlen = strlen(pattern);
625 struct ref *matched_weak = NULL;
626 struct ref *matched = NULL;
627 int weak_match = 0;
628 int match = 0;
629
630 for (weak_match = match = 0; refs; refs = refs->next) {
631 char *name = refs->name;
632 int namelen = strlen(name);
6b62816c 633
ae36bdcf 634 if (!refname_match(pattern, name, ref_rev_parse_rules))
6b62816c
DB
635 continue;
636
637 /* A match is "weak" if it is with refs outside
638 * heads or tags, and did not specify the pattern
639 * in full (e.g. "refs/remotes/origin/master") or at
640 * least from the toplevel (e.g. "remotes/origin/master");
641 * otherwise "git push $URL master" would result in
642 * ambiguity between remotes/origin/master and heads/master
643 * at the remote site.
644 */
645 if (namelen != patlen &&
646 patlen != namelen - 5 &&
647 prefixcmp(name, "refs/heads/") &&
648 prefixcmp(name, "refs/tags/")) {
649 /* We want to catch the case where only weak
650 * matches are found and there are multiple
651 * matches, and where more than one strong
652 * matches are found, as ambiguous. One
653 * strong match with zero or more weak matches
654 * are acceptable as a unique match.
655 */
656 matched_weak = refs;
657 weak_match++;
658 }
659 else {
660 matched = refs;
661 match++;
662 }
663 }
664 if (!matched) {
665 *matched_ref = matched_weak;
666 return weak_match;
667 }
668 else {
669 *matched_ref = matched;
670 return match;
671 }
672}
673
1d735267 674static void tail_link_ref(struct ref *ref, struct ref ***tail)
6b62816c
DB
675{
676 **tail = ref;
1d735267
DB
677 while (ref->next)
678 ref = ref->next;
6b62816c 679 *tail = &ref->next;
6b62816c
DB
680}
681
682static struct ref *try_explicit_object_name(const char *name)
683{
684 unsigned char sha1[20];
685 struct ref *ref;
686 int len;
687
688 if (!*name) {
dfd255dd 689 ref = alloc_ref(20);
6b62816c
DB
690 strcpy(ref->name, "(delete)");
691 hashclr(ref->new_sha1);
692 return ref;
693 }
694 if (get_sha1(name, sha1))
695 return NULL;
696 len = strlen(name) + 1;
dfd255dd 697 ref = alloc_ref(len);
6b62816c
DB
698 memcpy(ref->name, name, len);
699 hashcpy(ref->new_sha1, sha1);
700 return ref;
701}
702
1d735267 703static struct ref *make_linked_ref(const char *name, struct ref ***tail)
6b62816c 704{
1d735267 705 struct ref *ret;
163f0ee5 706 size_t len;
6b62816c 707
163f0ee5 708 len = strlen(name) + 1;
1d735267
DB
709 ret = alloc_ref(len);
710 memcpy(ret->name, name, len);
711 tail_link_ref(ret, tail);
712 return ret;
163f0ee5 713}
8558fd9e 714
54a8ad92
JH
715static int match_explicit(struct ref *src, struct ref *dst,
716 struct ref ***dst_tail,
717 struct refspec *rs,
718 int errs)
6b62816c 719{
54a8ad92 720 struct ref *matched_src, *matched_dst;
8558fd9e 721
54a8ad92 722 const char *dst_value = rs->dst;
6b62816c 723
54a8ad92
JH
724 if (rs->pattern)
725 return errs;
8558fd9e 726
54a8ad92
JH
727 matched_src = matched_dst = NULL;
728 switch (count_refspec_match(rs->src, src, &matched_src)) {
729 case 1:
730 break;
731 case 0:
732 /* The source could be in the get_sha1() format
733 * not a reference name. :refs/other is a
734 * way to delete 'other' ref at the remote end.
735 */
736 matched_src = try_explicit_object_name(rs->src);
7dfee372
SP
737 if (!matched_src)
738 error("src refspec %s does not match any.", rs->src);
54a8ad92
JH
739 break;
740 default:
3c8b7df1 741 matched_src = NULL;
7dfee372 742 error("src refspec %s matches more than one.", rs->src);
54a8ad92
JH
743 break;
744 }
3c8b7df1
JH
745
746 if (!matched_src)
747 errs = 1;
748
4491e62a 749 if (!dst_value) {
9f0ea7e8
DB
750 unsigned char sha1[20];
751 int flag;
752
4491e62a
SP
753 if (!matched_src)
754 return errs;
9f0ea7e8
DB
755 dst_value = resolve_ref(matched_src->name, sha1, 1, &flag);
756 if (!dst_value ||
757 ((flag & REF_ISSYMREF) &&
758 prefixcmp(dst_value, "refs/heads/")))
759 die("%s cannot be resolved to branch.",
760 matched_src->name);
4491e62a 761 }
3c8b7df1 762
54a8ad92
JH
763 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
764 case 1:
765 break;
766 case 0:
163f0ee5 767 if (!memcmp(dst_value, "refs/", 5))
1d735267 768 matched_dst = make_linked_ref(dst_value, dst_tail);
3c8b7df1 769 else
54a8ad92
JH
770 error("dst refspec %s does not match any "
771 "existing ref on the remote and does "
772 "not start with refs/.", dst_value);
54a8ad92
JH
773 break;
774 default:
3c8b7df1 775 matched_dst = NULL;
54a8ad92
JH
776 error("dst refspec %s matches more than one.",
777 dst_value);
778 break;
779 }
009c5bcd 780 if (errs || !matched_dst)
3c8b7df1 781 return 1;
54a8ad92
JH
782 if (matched_dst->peer_ref) {
783 errs = 1;
784 error("dst ref %s receives from more than one src.",
785 matched_dst->name);
6b62816c 786 }
54a8ad92
JH
787 else {
788 matched_dst->peer_ref = matched_src;
789 matched_dst->force = rs->force;
6b62816c 790 }
54a8ad92
JH
791 return errs;
792}
793
794static int match_explicit_refs(struct ref *src, struct ref *dst,
795 struct ref ***dst_tail, struct refspec *rs,
796 int rs_nr)
797{
798 int i, errs;
799 for (i = errs = 0; i < rs_nr; i++)
800 errs |= match_explicit(src, dst, dst_tail, &rs[i], errs);
6b62816c
DB
801 return -errs;
802}
803
6e66bf3c
AR
804static const struct refspec *check_pattern_match(const struct refspec *rs,
805 int rs_nr,
806 const struct ref *src)
8558fd9e
DB
807{
808 int i;
8558fd9e 809 for (i = 0; i < rs_nr; i++) {
ef00d150
DB
810 if (rs[i].pattern &&
811 !prefixcmp(src->name, rs[i].src) &&
812 src->name[strlen(rs[i].src)] == '/')
6e66bf3c 813 return rs + i;
8558fd9e 814 }
6e66bf3c 815 return NULL;
8558fd9e
DB
816}
817
54a8ad92
JH
818/*
819 * Note. This is used only by "push"; refspec matching rules for
820 * push and fetch are subtly different, so do not try to reuse it
821 * without thinking.
822 */
6b62816c 823int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
28b9d6e5 824 int nr_refspec, const char **refspec, int flags)
6b62816c
DB
825{
826 struct refspec *rs =
827 parse_ref_spec(nr_refspec, (const char **) refspec);
28b9d6e5
AW
828 int send_all = flags & MATCH_REFS_ALL;
829 int send_mirror = flags & MATCH_REFS_MIRROR;
6b62816c 830
8558fd9e
DB
831 if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
832 return -1;
6b62816c
DB
833
834 /* pick the remainder */
835 for ( ; src; src = src->next) {
836 struct ref *dst_peer;
6e66bf3c
AR
837 const struct refspec *pat = NULL;
838 char *dst_name;
6b62816c
DB
839 if (src->peer_ref)
840 continue;
6e66bf3c
AR
841 if (nr_refspec) {
842 pat = check_pattern_match(rs, nr_refspec, src);
843 if (!pat)
844 continue;
845 }
28b9d6e5 846 else if (!send_mirror && prefixcmp(src->name, "refs/heads/"))
098e711e
JH
847 /*
848 * "matching refs"; traditionally we pushed everything
849 * including refs outside refs/heads/ hierarchy, but
850 * that does not make much sense these days.
851 */
852 continue;
8558fd9e 853
6e66bf3c 854 if (pat) {
efd8f793
DB
855 const char *dst_side = pat->dst ? pat->dst : pat->src;
856 dst_name = xmalloc(strlen(dst_side) +
6e66bf3c
AR
857 strlen(src->name) -
858 strlen(pat->src) + 2);
efd8f793 859 strcpy(dst_name, dst_side);
6e66bf3c
AR
860 strcat(dst_name, src->name + strlen(pat->src));
861 } else
aa32eedc 862 dst_name = xstrdup(src->name);
6e66bf3c 863 dst_peer = find_ref_by_name(dst, dst_name);
8558fd9e
DB
864 if (dst_peer && dst_peer->peer_ref)
865 /* We're already sending something to this ref. */
6e66bf3c 866 goto free_name;
28b9d6e5
AW
867
868 if (!dst_peer && !nr_refspec && !(send_all || send_mirror))
869 /*
870 * Remote doesn't have it, and we have no
8558fd9e 871 * explicit pattern, and we don't have
28b9d6e5
AW
872 * --all nor --mirror.
873 */
6e66bf3c 874 goto free_name;
6b62816c
DB
875 if (!dst_peer) {
876 /* Create a new one and link it */
1d735267 877 dst_peer = make_linked_ref(dst_name, dst_tail);
6b62816c 878 hashcpy(dst_peer->new_sha1, src->new_sha1);
6b62816c
DB
879 }
880 dst_peer->peer_ref = src;
5eb73581
JK
881 if (pat)
882 dst_peer->force = pat->force;
6e66bf3c
AR
883 free_name:
884 free(dst_name);
6b62816c
DB
885 }
886 return 0;
887}
cf818348
DB
888
889struct branch *branch_get(const char *name)
890{
891 struct branch *ret;
892
893 read_config();
894 if (!name || !*name || !strcmp(name, "HEAD"))
895 ret = current_branch;
896 else
897 ret = make_branch(name, 0);
898 if (ret && ret->remote_name) {
899 ret->remote = remote_get(ret->remote_name);
900 if (ret->merge_nr) {
901 int i;
902 ret->merge = xcalloc(sizeof(*ret->merge),
903 ret->merge_nr);
904 for (i = 0; i < ret->merge_nr; i++) {
905 ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
906 ret->merge[i]->src = xstrdup(ret->merge_name[i]);
907 remote_find_tracking(ret->remote,
908 ret->merge[i]);
909 }
910 }
911 }
912 return ret;
913}
914
915int branch_has_merge_config(struct branch *branch)
916{
917 return branch && !!branch->merge;
918}
919
85682c19
SP
920int branch_merge_matches(struct branch *branch,
921 int i,
922 const char *refname)
cf818348 923{
85682c19 924 if (!branch || i < 0 || i >= branch->merge_nr)
cf818348 925 return 0;
605b4978 926 return refname_match(branch->merge[i]->src, refname, ref_fetch_rules);
cf818348 927}
d71ab174 928
4577370e 929static struct ref *get_expanded_map(const struct ref *remote_refs,
d71ab174
DB
930 const struct refspec *refspec)
931{
4577370e 932 const struct ref *ref;
d71ab174
DB
933 struct ref *ret = NULL;
934 struct ref **tail = &ret;
935
936 int remote_prefix_len = strlen(refspec->src);
937 int local_prefix_len = strlen(refspec->dst);
938
939 for (ref = remote_refs; ref; ref = ref->next) {
940 if (strchr(ref->name, '^'))
941 continue; /* a dereference item */
942 if (!prefixcmp(ref->name, refspec->src)) {
4577370e 943 const char *match;
d71ab174
DB
944 struct ref *cpy = copy_ref(ref);
945 match = ref->name + remote_prefix_len;
946
947 cpy->peer_ref = alloc_ref(local_prefix_len +
948 strlen(match) + 1);
949 sprintf(cpy->peer_ref->name, "%s%s",
950 refspec->dst, match);
951 if (refspec->force)
952 cpy->peer_ref->force = 1;
953 *tail = cpy;
954 tail = &cpy->next;
955 }
956 }
957
958 return ret;
959}
960
4577370e 961static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
d71ab174 962{
4577370e 963 const struct ref *ref;
d71ab174 964 for (ref = refs; ref; ref = ref->next) {
605b4978 965 if (refname_match(name, ref->name, ref_fetch_rules))
d71ab174
DB
966 return ref;
967 }
968 return NULL;
969}
970
4577370e 971struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
d71ab174 972{
4577370e 973 const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
d71ab174
DB
974
975 if (!ref)
9ad7c5ae 976 return NULL;
d71ab174
DB
977
978 return copy_ref(ref);
979}
980
981static struct ref *get_local_ref(const char *name)
982{
983 struct ref *ret;
984 if (!name)
985 return NULL;
986
987 if (!prefixcmp(name, "refs/")) {
988 ret = alloc_ref(strlen(name) + 1);
989 strcpy(ret->name, name);
990 return ret;
991 }
992
993 if (!prefixcmp(name, "heads/") ||
994 !prefixcmp(name, "tags/") ||
995 !prefixcmp(name, "remotes/")) {
996 ret = alloc_ref(strlen(name) + 6);
997 sprintf(ret->name, "refs/%s", name);
998 return ret;
999 }
1000
1001 ret = alloc_ref(strlen(name) + 12);
1002 sprintf(ret->name, "refs/heads/%s", name);
1003 return ret;
1004}
1005
4577370e 1006int get_fetch_map(const struct ref *remote_refs,
d71ab174 1007 const struct refspec *refspec,
9ad7c5ae
JH
1008 struct ref ***tail,
1009 int missing_ok)
d71ab174 1010{
ef00d150 1011 struct ref *ref_map, **rmp;
d71ab174
DB
1012
1013 if (refspec->pattern) {
1014 ref_map = get_expanded_map(remote_refs, refspec);
1015 } else {
9ad7c5ae
JH
1016 const char *name = refspec->src[0] ? refspec->src : "HEAD";
1017
1018 ref_map = get_remote_ref(remote_refs, name);
1019 if (!missing_ok && !ref_map)
1020 die("Couldn't find remote ref %s", name);
1021 if (ref_map) {
1022 ref_map->peer_ref = get_local_ref(refspec->dst);
1023 if (ref_map->peer_ref && refspec->force)
1024 ref_map->peer_ref->force = 1;
1025 }
d71ab174
DB
1026 }
1027
ef00d150
DB
1028 for (rmp = &ref_map; *rmp; ) {
1029 if ((*rmp)->peer_ref) {
1030 int st = check_ref_format((*rmp)->peer_ref->name + 5);
1031 if (st && st != CHECK_REF_FORMAT_ONELEVEL) {
1032 struct ref *ignore = *rmp;
1033 error("* Ignoring funny ref '%s' locally",
1034 (*rmp)->peer_ref->name);
1035 *rmp = (*rmp)->next;
1036 free(ignore->peer_ref);
1037 free(ignore);
1038 continue;
1039 }
1040 }
1041 rmp = &((*rmp)->next);
d71ab174
DB
1042 }
1043
8f70a765
AR
1044 if (ref_map)
1045 tail_link_ref(ref_map, tail);
d71ab174
DB
1046
1047 return 0;
1048}