1#include "cache.h"
2#include "remote.h"
3#include "refs.h"
4static struct remote **remotes;
6static int allocated_remotes;
7#define BUF_SIZE (2048)
9static char buffer[BUF_SIZE];
10static void add_push_refspec(struct remote *remote, const char *ref)
12{
13 int nr = remote->push_refspec_nr + 1;
14 remote->push_refspec =
15 xrealloc(remote->push_refspec, nr * sizeof(char *));
16 remote->push_refspec[nr-1] = ref;
17 remote->push_refspec_nr = nr;
18}
19static void add_fetch_refspec(struct remote *remote, const char *ref)
21{
22 int nr = remote->fetch_refspec_nr + 1;
23 remote->fetch_refspec =
24 xrealloc(remote->fetch_refspec, nr * sizeof(char *));
25 remote->fetch_refspec[nr-1] = ref;
26 remote->fetch_refspec_nr = nr;
27}
28static void add_uri(struct remote *remote, const char *uri)
30{
31 int nr = remote->uri_nr + 1;
32 remote->uri =
33 xrealloc(remote->uri, nr * sizeof(char *));
34 remote->uri[nr-1] = uri;
35 remote->uri_nr = nr;
36}
37static struct remote *make_remote(const char *name, int len)
39{
40 int i, empty = -1;
41 for (i = 0; i < allocated_remotes; i++) {
43 if (!remotes[i]) {
44 if (empty < 0)
45 empty = i;
46 } else {
47 if (len ? (!strncmp(name, remotes[i]->name, len) &&
48 !remotes[i]->name[len]) :
49 !strcmp(name, remotes[i]->name))
50 return remotes[i];
51 }
52 }
53 if (empty < 0) {
55 empty = allocated_remotes;
56 allocated_remotes += allocated_remotes ? allocated_remotes : 1;
57 remotes = xrealloc(remotes,
58 sizeof(*remotes) * allocated_remotes);
59 memset(remotes + empty, 0,
60 (allocated_remotes - empty) * sizeof(*remotes));
61 }
62 remotes[empty] = xcalloc(1, sizeof(struct remote));
63 if (len)
64 remotes[empty]->name = xstrndup(name, len);
65 else
66 remotes[empty]->name = xstrdup(name);
67 return remotes[empty];
68}
69static void read_remotes_file(struct remote *remote)
71{
72 FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
73 if (!f)
75 return;
76 while (fgets(buffer, BUF_SIZE, f)) {
77 int value_list;
78 char *s, *p;
79 if (!prefixcmp(buffer, "URL:")) {
81 value_list = 0;
82 s = buffer + 4;
83 } else if (!prefixcmp(buffer, "Push:")) {
84 value_list = 1;
85 s = buffer + 5;
86 } else if (!prefixcmp(buffer, "Pull:")) {
87 value_list = 2;
88 s = buffer + 5;
89 } else
90 continue;
91 while (isspace(*s))
93 s++;
94 if (!*s)
95 continue;
96 p = s + strlen(s);
98 while (isspace(p[-1]))
99 *--p = 0;
100 switch (value_list) {
102 case 0:
103 add_uri(remote, xstrdup(s));
104 break;
105 case 1:
106 add_push_refspec(remote, xstrdup(s));
107 break;
108 case 2:
109 add_fetch_refspec(remote, xstrdup(s));
110 break;
111 }
112 }
113 fclose(f);
114}
115static void read_branches_file(struct remote *remote)
117{
118 const char *slash = strchr(remote->name, '/');
119 int n = slash ? slash - remote->name : 1000;
120 FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
121 char *s, *p;
122 int len;
123 if (!f)
125 return;
126 s = fgets(buffer, BUF_SIZE, f);
127 fclose(f);
128 if (!s)
129 return;
130 while (isspace(*s))
131 s++;
132 if (!*s)
133 return;
134 p = s + strlen(s);
135 while (isspace(p[-1]))
136 *--p = 0;
137 len = p - s;
138 if (slash)
139 len += strlen(slash);
140 p = xmalloc(len + 1);
141 strcpy(p, s);
142 if (slash)
143 strcat(p, slash);
144 add_uri(remote, p);
145}
146static char *default_remote_name = NULL;
148static const char *current_branch = NULL;
149static int current_branch_len = 0;
150static int handle_config(const char *key, const char *value)
152{
153 const char *name;
154 const char *subkey;
155 struct remote *remote;
156 if (!prefixcmp(key, "branch.") && current_branch &&
157 !strncmp(key + 7, current_branch, current_branch_len) &&
158 !strcmp(key + 7 + current_branch_len, ".remote")) {
159 free(default_remote_name);
160 default_remote_name = xstrdup(value);
161 }
162 if (prefixcmp(key, "remote."))
163 return 0;
164 name = key + 7;
165 subkey = strrchr(name, '.');
166 if (!subkey)
167 return error("Config with no key for remote %s", name);
168 if (*subkey == '/') {
169 warning("Config remote shorthand cannot begin with '/': %s", name);
170 return 0;
171 }
172 remote = make_remote(name, subkey - name);
173 if (!value) {
174 /* if we ever have a boolean variable, e.g. "remote.*.disabled"
175 * [remote "frotz"]
176 * disabled
177 * is a valid way to set it to true; we get NULL in value so
178 * we need to handle it here.
179 *
180 * if (!strcmp(subkey, ".disabled")) {
181 * val = git_config_bool(key, value);
182 * return 0;
183 * } else
184 *
185 */
186 return 0; /* ignore unknown booleans */
187 }
188 if (!strcmp(subkey, ".url")) {
189 add_uri(remote, xstrdup(value));
190 } else if (!strcmp(subkey, ".push")) {
191 add_push_refspec(remote, xstrdup(value));
192 } else if (!strcmp(subkey, ".fetch")) {
193 add_fetch_refspec(remote, xstrdup(value));
194 } else if (!strcmp(subkey, ".receivepack")) {
195 if (!remote->receivepack)
196 remote->receivepack = xstrdup(value);
197 else
198 error("more than one receivepack given, using the first");
199 }
200 return 0;
201}
202static void read_config(void)
204{
205 unsigned char sha1[20];
206 const char *head_ref;
207 int flag;
208 if (default_remote_name) // did this already
209 return;
210 default_remote_name = xstrdup("origin");
211 current_branch = NULL;
212 head_ref = resolve_ref("HEAD", sha1, 0, &flag);
213 if (head_ref && (flag & REF_ISSYMREF) &&
214 !prefixcmp(head_ref, "refs/heads/")) {
215 current_branch = head_ref + strlen("refs/heads/");
216 current_branch_len = strlen(current_branch);
217 }
218 git_config(handle_config);
219}
220static struct refspec *parse_ref_spec(int nr_refspec, const char **refspec)
222{
223 int i;
224 struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec);
225 for (i = 0; i < nr_refspec; i++) {
226 const char *sp, *ep, *gp;
227 sp = refspec[i];
228 if (*sp == '+') {
229 rs[i].force = 1;
230 sp++;
231 }
232 gp = strchr(sp, '*');
233 ep = strchr(sp, ':');
234 if (gp && ep && gp > ep)
235 gp = NULL;
236 if (ep) {
237 if (ep[1]) {
238 const char *glob = strchr(ep + 1, '*');
239 if (!glob)
240 gp = NULL;
241 if (gp)
242 rs[i].dst = xstrndup(ep + 1,
243 glob - ep - 1);
244 else
245 rs[i].dst = xstrdup(ep + 1);
246 }
247 } else {
248 ep = sp + strlen(sp);
249 }
250 if (gp) {
251 rs[i].pattern = 1;
252 ep = gp;
253 }
254 rs[i].src = xstrndup(sp, ep - sp);
255 }
256 return rs;
257}
258struct remote *remote_get(const char *name)
260{
261 struct remote *ret;
262 read_config();
264 if (!name)
265 name = default_remote_name;
266 ret = make_remote(name, 0);
267 if (name[0] != '/') {
268 if (!ret->uri)
269 read_remotes_file(ret);
270 if (!ret->uri)
271 read_branches_file(ret);
272 }
273 if (!ret->uri)
274 add_uri(ret, name);
275 if (!ret->uri)
276 return NULL;
277 ret->fetch = parse_ref_spec(ret->fetch_refspec_nr, ret->fetch_refspec);
278 ret->push = parse_ref_spec(ret->push_refspec_nr, ret->push_refspec);
279 return ret;
280}
281int remote_has_uri(struct remote *remote, const char *uri)
283{
284 int i;
285 for (i = 0; i < remote->uri_nr; i++) {
286 if (!strcmp(remote->uri[i], uri))
287 return 1;
288 }
289 return 0;
290}
291int remote_find_tracking(struct remote *remote, struct refspec *refspec)
293{
294 int i;
295 for (i = 0; i < remote->fetch_refspec_nr; i++) {
296 struct refspec *fetch = &remote->fetch[i];
297 if (!fetch->dst)
298 continue;
299 if (fetch->pattern) {
300 if (!prefixcmp(refspec->src, fetch->src)) {
301 refspec->dst =
302 xmalloc(strlen(fetch->dst) +
303 strlen(refspec->src) -
304 strlen(fetch->src) + 1);
305 strcpy(refspec->dst, fetch->dst);
306 strcpy(refspec->dst + strlen(fetch->dst),
307 refspec->src + strlen(fetch->src));
308 refspec->force = fetch->force;
309 return 0;
310 }
311 } else {
312 if (!strcmp(refspec->src, fetch->src)) {
313 refspec->dst = xstrdup(fetch->dst);
314 refspec->force = fetch->force;
315 return 0;
316 }
317 }
318 }
319 refspec->dst = NULL;
320 return -1;
321}
322struct ref *alloc_ref(unsigned namelen)
324{
325 struct ref *ret = xmalloc(sizeof(struct ref) + namelen);
326 memset(ret, 0, sizeof(struct ref) + namelen);
327 return ret;
328}
329void free_refs(struct ref *ref)
331{
332 struct ref *next;
333 while (ref) {
334 next = ref->next;
335 if (ref->peer_ref)
336 free(ref->peer_ref);
337 free(ref);
338 ref = next;
339 }
340}
341static int count_refspec_match(const char *pattern,
343 struct ref *refs,
344 struct ref **matched_ref)
345{
346 int patlen = strlen(pattern);
347 struct ref *matched_weak = NULL;
348 struct ref *matched = NULL;
349 int weak_match = 0;
350 int match = 0;
351 for (weak_match = match = 0; refs; refs = refs->next) {
353 char *name = refs->name;
354 int namelen = strlen(name);
355 if (namelen < patlen ||
357 memcmp(name + namelen - patlen, pattern, patlen))
358 continue;
359 if (namelen != patlen && name[namelen - patlen - 1] != '/')
360 continue;
361 /* A match is "weak" if it is with refs outside
363 * heads or tags, and did not specify the pattern
364 * in full (e.g. "refs/remotes/origin/master") or at
365 * least from the toplevel (e.g. "remotes/origin/master");
366 * otherwise "git push $URL master" would result in
367 * ambiguity between remotes/origin/master and heads/master
368 * at the remote site.
369 */
370 if (namelen != patlen &&
371 patlen != namelen - 5 &&
372 prefixcmp(name, "refs/heads/") &&
373 prefixcmp(name, "refs/tags/")) {
374 /* We want to catch the case where only weak
375 * matches are found and there are multiple
376 * matches, and where more than one strong
377 * matches are found, as ambiguous. One
378 * strong match with zero or more weak matches
379 * are acceptable as a unique match.
380 */
381 matched_weak = refs;
382 weak_match++;
383 }
384 else {
385 matched = refs;
386 match++;
387 }
388 }
389 if (!matched) {
390 *matched_ref = matched_weak;
391 return weak_match;
392 }
393 else {
394 *matched_ref = matched;
395 return match;
396 }
397}
398static void tail_link_ref(struct ref *ref, struct ref ***tail)
400{
401 **tail = ref;
402 while (ref->next)
403 ref = ref->next;
404 *tail = &ref->next;
405}
406static struct ref *try_explicit_object_name(const char *name)
408{
409 unsigned char sha1[20];
410 struct ref *ref;
411 int len;
412 if (!*name) {
414 ref = alloc_ref(20);
415 strcpy(ref->name, "(delete)");
416 hashclr(ref->new_sha1);
417 return ref;
418 }
419 if (get_sha1(name, sha1))
420 return NULL;
421 len = strlen(name) + 1;
422 ref = alloc_ref(len);
423 memcpy(ref->name, name, len);
424 hashcpy(ref->new_sha1, sha1);
425 return ref;
426}
427static struct ref *make_linked_ref(const char *name, struct ref ***tail)
429{
430 struct ref *ret;
431 size_t len;
432 len = strlen(name) + 1;
434 ret = alloc_ref(len);
435 memcpy(ret->name, name, len);
436 tail_link_ref(ret, tail);
437 return ret;
438}
439static int match_explicit(struct ref *src, struct ref *dst,
441 struct ref ***dst_tail,
442 struct refspec *rs,
443 int errs)
444{
445 struct ref *matched_src, *matched_dst;
446 const char *dst_value = rs->dst;
448 if (rs->pattern)
450 return errs;
451 matched_src = matched_dst = NULL;
453 switch (count_refspec_match(rs->src, src, &matched_src)) {
454 case 1:
455 break;
456 case 0:
457 /* The source could be in the get_sha1() format
458 * not a reference name. :refs/other is a
459 * way to delete 'other' ref at the remote end.
460 */
461 matched_src = try_explicit_object_name(rs->src);
462 if (matched_src)
463 break;
464 error("src refspec %s does not match any.",
465 rs->src);
466 break;
467 default:
468 matched_src = NULL;
469 error("src refspec %s matches more than one.",
470 rs->src);
471 break;
472 }
473 if (!matched_src)
475 errs = 1;
476 if (dst_value == NULL)
478 dst_value = matched_src->name;
479 switch (count_refspec_match(dst_value, dst, &matched_dst)) {
481 case 1:
482 break;
483 case 0:
484 if (!memcmp(dst_value, "refs/", 5))
485 matched_dst = make_linked_ref(dst_value, dst_tail);
486 else
487 error("dst refspec %s does not match any "
488 "existing ref on the remote and does "
489 "not start with refs/.", dst_value);
490 break;
491 default:
492 matched_dst = NULL;
493 error("dst refspec %s matches more than one.",
494 dst_value);
495 break;
496 }
497 if (errs || matched_dst == NULL)
498 return 1;
499 if (matched_dst->peer_ref) {
500 errs = 1;
501 error("dst ref %s receives from more than one src.",
502 matched_dst->name);
503 }
504 else {
505 matched_dst->peer_ref = matched_src;
506 matched_dst->force = rs->force;
507 }
508 return errs;
509}
510static int match_explicit_refs(struct ref *src, struct ref *dst,
512 struct ref ***dst_tail, struct refspec *rs,
513 int rs_nr)
514{
515 int i, errs;
516 for (i = errs = 0; i < rs_nr; i++)
517 errs |= match_explicit(src, dst, dst_tail, &rs[i], errs);
518 return -errs;
519}
520static struct ref *find_ref_by_name(struct ref *list, const char *name)
522{
523 for ( ; list; list = list->next)
524 if (!strcmp(list->name, name))
525 return list;
526 return NULL;
527}
528static const struct refspec *check_pattern_match(const struct refspec *rs,
530 int rs_nr,
531 const struct ref *src)
532{
533 int i;
534 for (i = 0; i < rs_nr; i++) {
535 if (rs[i].pattern && !prefixcmp(src->name, rs[i].src))
536 return rs + i;
537 }
538 return NULL;
539}
540/*
542 * Note. This is used only by "push"; refspec matching rules for
543 * push and fetch are subtly different, so do not try to reuse it
544 * without thinking.
545 */
546int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
547 int nr_refspec, char **refspec, int all)
548{
549 struct refspec *rs =
550 parse_ref_spec(nr_refspec, (const char **) refspec);
551 if (match_explicit_refs(src, dst, dst_tail, rs, nr_refspec))
553 return -1;
554 /* pick the remainder */
556 for ( ; src; src = src->next) {
557 struct ref *dst_peer;
558 const struct refspec *pat = NULL;
559 char *dst_name;
560 if (src->peer_ref)
561 continue;
562 if (nr_refspec) {
563 pat = check_pattern_match(rs, nr_refspec, src);
564 if (!pat)
565 continue;
566 }
567 else if (prefixcmp(src->name, "refs/heads/"))
568 /*
569 * "matching refs"; traditionally we pushed everything
570 * including refs outside refs/heads/ hierarchy, but
571 * that does not make much sense these days.
572 */
573 continue;
574 if (pat) {
576 const char *dst_side = pat->dst ? pat->dst : pat->src;
577 dst_name = xmalloc(strlen(dst_side) +
578 strlen(src->name) -
579 strlen(pat->src) + 2);
580 strcpy(dst_name, dst_side);
581 strcat(dst_name, src->name + strlen(pat->src));
582 } else
583 dst_name = xstrdup(src->name);
584 dst_peer = find_ref_by_name(dst, dst_name);
585 if (dst_peer && dst_peer->peer_ref)
586 /* We're already sending something to this ref. */
587 goto free_name;
588 if (!dst_peer && !nr_refspec && !all)
589 /* Remote doesn't have it, and we have no
590 * explicit pattern, and we don't have
591 * --all. */
592 goto free_name;
593 if (!dst_peer) {
594 /* Create a new one and link it */
595 dst_peer = make_linked_ref(dst_name, dst_tail);
596 hashcpy(dst_peer->new_sha1, src->new_sha1);
597 }
598 dst_peer->peer_ref = src;
599 free_name:
600 free(dst_name);
601 }
602 return 0;
603}