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5751f490 DB |
1 | #include "cache.h" |
2 | #include "remote.h" | |
3 | #include "refs.h" | |
4 | ||
5 | static struct remote **remotes; | |
6 | static int allocated_remotes; | |
7 | ||
8 | #define BUF_SIZE (2048) | |
9 | static char buffer[BUF_SIZE]; | |
10 | ||
11 | static 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 | } | |
19 | ||
20 | static void add_uri(struct remote *remote, const char *uri) | |
21 | { | |
22 | int nr = remote->uri_nr + 1; | |
23 | remote->uri = | |
24 | xrealloc(remote->uri, nr * sizeof(char *)); | |
25 | remote->uri[nr-1] = uri; | |
26 | remote->uri_nr = nr; | |
27 | } | |
28 | ||
29 | static struct remote *make_remote(const char *name, int len) | |
30 | { | |
31 | int i, empty = -1; | |
32 | ||
33 | for (i = 0; i < allocated_remotes; i++) { | |
34 | if (!remotes[i]) { | |
35 | if (empty < 0) | |
36 | empty = i; | |
37 | } else { | |
38 | if (len ? (!strncmp(name, remotes[i]->name, len) && | |
39 | !remotes[i]->name[len]) : | |
40 | !strcmp(name, remotes[i]->name)) | |
41 | return remotes[i]; | |
42 | } | |
43 | } | |
44 | ||
45 | if (empty < 0) { | |
46 | empty = allocated_remotes; | |
47 | allocated_remotes += allocated_remotes ? allocated_remotes : 1; | |
48 | remotes = xrealloc(remotes, | |
49 | sizeof(*remotes) * allocated_remotes); | |
50 | memset(remotes + empty, 0, | |
51 | (allocated_remotes - empty) * sizeof(*remotes)); | |
52 | } | |
53 | remotes[empty] = xcalloc(1, sizeof(struct remote)); | |
54 | if (len) | |
55 | remotes[empty]->name = xstrndup(name, len); | |
56 | else | |
57 | remotes[empty]->name = xstrdup(name); | |
58 | return remotes[empty]; | |
59 | } | |
60 | ||
61 | static void read_remotes_file(struct remote *remote) | |
62 | { | |
63 | FILE *f = fopen(git_path("remotes/%s", remote->name), "r"); | |
64 | ||
65 | if (!f) | |
66 | return; | |
67 | while (fgets(buffer, BUF_SIZE, f)) { | |
68 | int value_list; | |
69 | char *s, *p; | |
70 | ||
71 | if (!prefixcmp(buffer, "URL:")) { | |
72 | value_list = 0; | |
73 | s = buffer + 4; | |
74 | } else if (!prefixcmp(buffer, "Push:")) { | |
75 | value_list = 1; | |
76 | s = buffer + 5; | |
77 | } else | |
78 | continue; | |
79 | ||
80 | while (isspace(*s)) | |
81 | s++; | |
82 | if (!*s) | |
83 | continue; | |
84 | ||
85 | p = s + strlen(s); | |
86 | while (isspace(p[-1])) | |
87 | *--p = 0; | |
88 | ||
89 | switch (value_list) { | |
90 | case 0: | |
91 | add_uri(remote, xstrdup(s)); | |
92 | break; | |
93 | case 1: | |
94 | add_push_refspec(remote, xstrdup(s)); | |
95 | break; | |
96 | } | |
97 | } | |
98 | fclose(f); | |
99 | } | |
100 | ||
101 | static void read_branches_file(struct remote *remote) | |
102 | { | |
103 | const char *slash = strchr(remote->name, '/'); | |
104 | int n = slash ? slash - remote->name : 1000; | |
105 | FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r"); | |
106 | char *s, *p; | |
107 | int len; | |
108 | ||
109 | if (!f) | |
110 | return; | |
111 | s = fgets(buffer, BUF_SIZE, f); | |
112 | fclose(f); | |
113 | if (!s) | |
114 | return; | |
115 | while (isspace(*s)) | |
116 | s++; | |
117 | if (!*s) | |
118 | return; | |
119 | p = s + strlen(s); | |
120 | while (isspace(p[-1])) | |
121 | *--p = 0; | |
122 | len = p - s; | |
123 | if (slash) | |
124 | len += strlen(slash); | |
125 | p = xmalloc(len + 1); | |
126 | strcpy(p, s); | |
127 | if (slash) | |
128 | strcat(p, slash); | |
129 | add_uri(remote, p); | |
130 | } | |
131 | ||
132 | static char *default_remote_name = NULL; | |
133 | static const char *current_branch = NULL; | |
134 | static int current_branch_len = 0; | |
135 | ||
136 | static int handle_config(const char *key, const char *value) | |
137 | { | |
138 | const char *name; | |
139 | const char *subkey; | |
140 | struct remote *remote; | |
141 | if (!prefixcmp(key, "branch.") && current_branch && | |
142 | !strncmp(key + 7, current_branch, current_branch_len) && | |
143 | !strcmp(key + 7 + current_branch_len, ".remote")) { | |
144 | free(default_remote_name); | |
145 | default_remote_name = xstrdup(value); | |
146 | } | |
147 | if (prefixcmp(key, "remote.")) | |
148 | return 0; | |
149 | name = key + 7; | |
150 | subkey = strrchr(name, '.'); | |
151 | if (!subkey) | |
152 | return error("Config with no key for remote %s", name); | |
153 | if (*subkey == '/') { | |
154 | warning("Config remote shorthand cannot begin with '/': %s", name); | |
155 | return 0; | |
156 | } | |
157 | remote = make_remote(name, subkey - name); | |
158 | if (!value) { | |
159 | /* if we ever have a boolean variable, e.g. "remote.*.disabled" | |
160 | * [remote "frotz"] | |
161 | * disabled | |
162 | * is a valid way to set it to true; we get NULL in value so | |
163 | * we need to handle it here. | |
164 | * | |
165 | * if (!strcmp(subkey, ".disabled")) { | |
166 | * val = git_config_bool(key, value); | |
167 | * return 0; | |
168 | * } else | |
169 | * | |
170 | */ | |
171 | return 0; /* ignore unknown booleans */ | |
172 | } | |
173 | if (!strcmp(subkey, ".url")) { | |
174 | add_uri(remote, xstrdup(value)); | |
175 | } else if (!strcmp(subkey, ".push")) { | |
176 | add_push_refspec(remote, xstrdup(value)); | |
177 | } else if (!strcmp(subkey, ".receivepack")) { | |
178 | if (!remote->receivepack) | |
179 | remote->receivepack = xstrdup(value); | |
180 | else | |
181 | error("more than one receivepack given, using the first"); | |
182 | } | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static void read_config(void) | |
187 | { | |
188 | unsigned char sha1[20]; | |
189 | const char *head_ref; | |
190 | int flag; | |
191 | if (default_remote_name) // did this already | |
192 | return; | |
193 | default_remote_name = xstrdup("origin"); | |
194 | current_branch = NULL; | |
195 | head_ref = resolve_ref("HEAD", sha1, 0, &flag); | |
196 | if (head_ref && (flag & REF_ISSYMREF) && | |
197 | !prefixcmp(head_ref, "refs/heads/")) { | |
198 | current_branch = head_ref + strlen("refs/heads/"); | |
199 | current_branch_len = strlen(current_branch); | |
200 | } | |
201 | git_config(handle_config); | |
202 | } | |
203 | ||
6b62816c DB |
204 | static struct refspec *parse_ref_spec(int nr_refspec, const char **refspec) |
205 | { | |
206 | int i; | |
207 | struct refspec *rs = xcalloc(sizeof(*rs), nr_refspec); | |
208 | for (i = 0; i < nr_refspec; i++) { | |
209 | const char *sp, *ep, *gp; | |
210 | sp = refspec[i]; | |
211 | if (*sp == '+') { | |
212 | rs[i].force = 1; | |
213 | sp++; | |
214 | } | |
215 | gp = strchr(sp, '*'); | |
216 | ep = strchr(sp, ':'); | |
217 | if (gp && ep && gp > ep) | |
218 | gp = NULL; | |
219 | if (ep) { | |
220 | if (ep[1]) { | |
221 | const char *glob = strchr(ep + 1, '*'); | |
222 | if (!glob) | |
223 | gp = NULL; | |
224 | if (gp) | |
225 | rs[i].dst = xstrndup(ep + 1, | |
226 | glob - ep - 1); | |
227 | else | |
228 | rs[i].dst = xstrdup(ep + 1); | |
229 | } | |
230 | } else { | |
231 | ep = sp + strlen(sp); | |
232 | } | |
233 | if (gp) { | |
234 | rs[i].pattern = 1; | |
235 | ep = gp; | |
236 | } | |
237 | rs[i].src = xstrndup(sp, ep - sp); | |
238 | } | |
239 | return rs; | |
240 | } | |
241 | ||
5751f490 DB |
242 | struct remote *remote_get(const char *name) |
243 | { | |
244 | struct remote *ret; | |
245 | ||
246 | read_config(); | |
247 | if (!name) | |
248 | name = default_remote_name; | |
249 | ret = make_remote(name, 0); | |
250 | if (name[0] != '/') { | |
251 | if (!ret->uri) | |
252 | read_remotes_file(ret); | |
253 | if (!ret->uri) | |
254 | read_branches_file(ret); | |
255 | } | |
256 | if (!ret->uri) | |
257 | add_uri(ret, name); | |
258 | if (!ret->uri) | |
259 | return NULL; | |
6b62816c | 260 | ret->push = parse_ref_spec(ret->push_refspec_nr, ret->push_refspec); |
5751f490 DB |
261 | return ret; |
262 | } | |
6b62816c DB |
263 | |
264 | static int count_refspec_match(const char *pattern, | |
265 | struct ref *refs, | |
266 | struct ref **matched_ref) | |
267 | { | |
268 | int patlen = strlen(pattern); | |
269 | struct ref *matched_weak = NULL; | |
270 | struct ref *matched = NULL; | |
271 | int weak_match = 0; | |
272 | int match = 0; | |
273 | ||
274 | for (weak_match = match = 0; refs; refs = refs->next) { | |
275 | char *name = refs->name; | |
276 | int namelen = strlen(name); | |
277 | int weak_match; | |
278 | ||
279 | if (namelen < patlen || | |
280 | memcmp(name + namelen - patlen, pattern, patlen)) | |
281 | continue; | |
282 | if (namelen != patlen && name[namelen - patlen - 1] != '/') | |
283 | continue; | |
284 | ||
285 | /* A match is "weak" if it is with refs outside | |
286 | * heads or tags, and did not specify the pattern | |
287 | * in full (e.g. "refs/remotes/origin/master") or at | |
288 | * least from the toplevel (e.g. "remotes/origin/master"); | |
289 | * otherwise "git push $URL master" would result in | |
290 | * ambiguity between remotes/origin/master and heads/master | |
291 | * at the remote site. | |
292 | */ | |
293 | if (namelen != patlen && | |
294 | patlen != namelen - 5 && | |
295 | prefixcmp(name, "refs/heads/") && | |
296 | prefixcmp(name, "refs/tags/")) { | |
297 | /* We want to catch the case where only weak | |
298 | * matches are found and there are multiple | |
299 | * matches, and where more than one strong | |
300 | * matches are found, as ambiguous. One | |
301 | * strong match with zero or more weak matches | |
302 | * are acceptable as a unique match. | |
303 | */ | |
304 | matched_weak = refs; | |
305 | weak_match++; | |
306 | } | |
307 | else { | |
308 | matched = refs; | |
309 | match++; | |
310 | } | |
311 | } | |
312 | if (!matched) { | |
313 | *matched_ref = matched_weak; | |
314 | return weak_match; | |
315 | } | |
316 | else { | |
317 | *matched_ref = matched; | |
318 | return match; | |
319 | } | |
320 | } | |
321 | ||
322 | static void link_dst_tail(struct ref *ref, struct ref ***tail) | |
323 | { | |
324 | **tail = ref; | |
325 | *tail = &ref->next; | |
326 | **tail = NULL; | |
327 | } | |
328 | ||
329 | static struct ref *try_explicit_object_name(const char *name) | |
330 | { | |
331 | unsigned char sha1[20]; | |
332 | struct ref *ref; | |
333 | int len; | |
334 | ||
335 | if (!*name) { | |
336 | ref = xcalloc(1, sizeof(*ref) + 20); | |
337 | strcpy(ref->name, "(delete)"); | |
338 | hashclr(ref->new_sha1); | |
339 | return ref; | |
340 | } | |
341 | if (get_sha1(name, sha1)) | |
342 | return NULL; | |
343 | len = strlen(name) + 1; | |
344 | ref = xcalloc(1, sizeof(*ref) + len); | |
345 | memcpy(ref->name, name, len); | |
346 | hashcpy(ref->new_sha1, sha1); | |
347 | return ref; | |
348 | } | |
349 | ||
350 | static int match_explicit_refs(struct ref *src, struct ref *dst, | |
351 | struct ref ***dst_tail, struct refspec *rs, | |
352 | int rs_nr) | |
353 | { | |
354 | int i, errs; | |
355 | for (i = errs = 0; i < rs_nr; i++) { | |
356 | struct ref *matched_src, *matched_dst; | |
357 | ||
358 | const char *dst_value = rs[i].dst; | |
359 | if (dst_value == NULL) | |
360 | dst_value = rs[i].src; | |
361 | ||
362 | matched_src = matched_dst = NULL; | |
363 | switch (count_refspec_match(rs[i].src, src, &matched_src)) { | |
364 | case 1: | |
365 | break; | |
366 | case 0: | |
367 | /* The source could be in the get_sha1() format | |
368 | * not a reference name. :refs/other is a | |
369 | * way to delete 'other' ref at the remote end. | |
370 | */ | |
371 | matched_src = try_explicit_object_name(rs[i].src); | |
372 | if (matched_src) | |
373 | break; | |
374 | errs = 1; | |
375 | error("src refspec %s does not match any.", | |
376 | rs[i].src); | |
377 | break; | |
378 | default: | |
379 | errs = 1; | |
380 | error("src refspec %s matches more than one.", | |
381 | rs[i].src); | |
382 | break; | |
383 | } | |
384 | switch (count_refspec_match(dst_value, dst, &matched_dst)) { | |
385 | case 1: | |
386 | break; | |
387 | case 0: | |
388 | if (!memcmp(dst_value, "refs/", 5)) { | |
389 | int len = strlen(dst_value) + 1; | |
390 | matched_dst = xcalloc(1, sizeof(*dst) + len); | |
391 | memcpy(matched_dst->name, dst_value, len); | |
392 | link_dst_tail(matched_dst, dst_tail); | |
393 | } | |
394 | else if (!strcmp(rs[i].src, dst_value) && | |
395 | matched_src) { | |
396 | /* pushing "master:master" when | |
397 | * remote does not have master yet. | |
398 | */ | |
399 | int len = strlen(matched_src->name) + 1; | |
400 | matched_dst = xcalloc(1, sizeof(*dst) + len); | |
401 | memcpy(matched_dst->name, matched_src->name, | |
402 | len); | |
403 | link_dst_tail(matched_dst, dst_tail); | |
404 | } | |
405 | else { | |
406 | errs = 1; | |
407 | error("dst refspec %s does not match any " | |
408 | "existing ref on the remote and does " | |
409 | "not start with refs/.", dst_value); | |
410 | } | |
411 | break; | |
412 | default: | |
413 | errs = 1; | |
414 | error("dst refspec %s matches more than one.", | |
415 | dst_value); | |
416 | break; | |
417 | } | |
418 | if (errs) | |
419 | continue; | |
420 | if (matched_dst->peer_ref) { | |
421 | errs = 1; | |
422 | error("dst ref %s receives from more than one src.", | |
423 | matched_dst->name); | |
424 | } | |
425 | else { | |
426 | matched_dst->peer_ref = matched_src; | |
427 | matched_dst->force = rs[i].force; | |
428 | } | |
429 | } | |
430 | return -errs; | |
431 | } | |
432 | ||
433 | static struct ref *find_ref_by_name(struct ref *list, const char *name) | |
434 | { | |
435 | for ( ; list; list = list->next) | |
436 | if (!strcmp(list->name, name)) | |
437 | return list; | |
438 | return NULL; | |
439 | } | |
440 | ||
441 | int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail, | |
442 | int nr_refspec, char **refspec, int all) | |
443 | { | |
444 | struct refspec *rs = | |
445 | parse_ref_spec(nr_refspec, (const char **) refspec); | |
446 | ||
447 | if (nr_refspec) | |
448 | return match_explicit_refs(src, dst, dst_tail, rs, nr_refspec); | |
449 | ||
450 | /* pick the remainder */ | |
451 | for ( ; src; src = src->next) { | |
452 | struct ref *dst_peer; | |
453 | if (src->peer_ref) | |
454 | continue; | |
455 | dst_peer = find_ref_by_name(dst, src->name); | |
456 | if ((dst_peer && dst_peer->peer_ref) || (!dst_peer && !all)) | |
457 | continue; | |
458 | if (!dst_peer) { | |
459 | /* Create a new one and link it */ | |
460 | int len = strlen(src->name) + 1; | |
461 | dst_peer = xcalloc(1, sizeof(*dst_peer) + len); | |
462 | memcpy(dst_peer->name, src->name, len); | |
463 | hashcpy(dst_peer->new_sha1, src->new_sha1); | |
464 | link_dst_tail(dst_peer, dst_tail); | |
465 | } | |
466 | dst_peer->peer_ref = src; | |
467 | } | |
468 | return 0; | |
469 | } |