]>
Commit | Line | Data |
---|---|---|
1 | #include "git-compat-util.h" | |
2 | #include "cache.h" | |
3 | #include "pkt-line.h" | |
4 | #include "quote.h" | |
5 | #include "refs.h" | |
6 | ||
7 | static char *server_capabilities; | |
8 | ||
9 | static int check_ref(const char *name, int len, unsigned int flags) | |
10 | { | |
11 | if (!flags) | |
12 | return 1; | |
13 | ||
14 | if (len < 5 || memcmp(name, "refs/", 5)) | |
15 | return 0; | |
16 | ||
17 | /* Skip the "refs/" part */ | |
18 | name += 5; | |
19 | len -= 5; | |
20 | ||
21 | /* REF_NORMAL means that we don't want the magic fake tag refs */ | |
22 | if ((flags & REF_NORMAL) && check_ref_format(name) < 0) | |
23 | return 0; | |
24 | ||
25 | /* REF_HEADS means that we want regular branch heads */ | |
26 | if ((flags & REF_HEADS) && !memcmp(name, "heads/", 6)) | |
27 | return 1; | |
28 | ||
29 | /* REF_TAGS means that we want tags */ | |
30 | if ((flags & REF_TAGS) && !memcmp(name, "tags/", 5)) | |
31 | return 1; | |
32 | ||
33 | /* All type bits clear means that we are ok with anything */ | |
34 | return !(flags & ~REF_NORMAL); | |
35 | } | |
36 | ||
37 | /* | |
38 | * Read all the refs from the other end | |
39 | */ | |
40 | struct ref **get_remote_heads(int in, struct ref **list, | |
41 | int nr_match, char **match, | |
42 | unsigned int flags) | |
43 | { | |
44 | *list = NULL; | |
45 | for (;;) { | |
46 | struct ref *ref; | |
47 | unsigned char old_sha1[20]; | |
48 | static char buffer[1000]; | |
49 | char *name; | |
50 | int len, name_len; | |
51 | ||
52 | len = packet_read_line(in, buffer, sizeof(buffer)); | |
53 | if (!len) | |
54 | break; | |
55 | if (buffer[len-1] == '\n') | |
56 | buffer[--len] = 0; | |
57 | ||
58 | if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ') | |
59 | die("protocol error: expected sha/ref, got '%s'", buffer); | |
60 | name = buffer + 41; | |
61 | ||
62 | name_len = strlen(name); | |
63 | if (len != name_len + 41) { | |
64 | if (server_capabilities) | |
65 | free(server_capabilities); | |
66 | server_capabilities = xstrdup(name + name_len + 1); | |
67 | } | |
68 | ||
69 | if (!check_ref(name, name_len, flags)) | |
70 | continue; | |
71 | if (nr_match && !path_match(name, nr_match, match)) | |
72 | continue; | |
73 | ref = xcalloc(1, sizeof(*ref) + len - 40); | |
74 | hashcpy(ref->old_sha1, old_sha1); | |
75 | memcpy(ref->name, buffer + 41, len - 40); | |
76 | *list = ref; | |
77 | list = &ref->next; | |
78 | } | |
79 | return list; | |
80 | } | |
81 | ||
82 | int server_supports(const char *feature) | |
83 | { | |
84 | return server_capabilities && | |
85 | strstr(server_capabilities, feature) != NULL; | |
86 | } | |
87 | ||
88 | int get_ack(int fd, unsigned char *result_sha1) | |
89 | { | |
90 | static char line[1000]; | |
91 | int len = packet_read_line(fd, line, sizeof(line)); | |
92 | ||
93 | if (!len) | |
94 | die("git-fetch-pack: expected ACK/NAK, got EOF"); | |
95 | if (line[len-1] == '\n') | |
96 | line[--len] = 0; | |
97 | if (!strcmp(line, "NAK")) | |
98 | return 0; | |
99 | if (!prefixcmp(line, "ACK ")) { | |
100 | if (!get_sha1_hex(line+4, result_sha1)) { | |
101 | if (strstr(line+45, "continue")) | |
102 | return 2; | |
103 | return 1; | |
104 | } | |
105 | } | |
106 | die("git-fetch_pack: expected ACK/NAK, got '%s'", line); | |
107 | } | |
108 | ||
109 | int path_match(const char *path, int nr, char **match) | |
110 | { | |
111 | int i; | |
112 | int pathlen = strlen(path); | |
113 | ||
114 | for (i = 0; i < nr; i++) { | |
115 | char *s = match[i]; | |
116 | int len = strlen(s); | |
117 | ||
118 | if (!len || len > pathlen) | |
119 | continue; | |
120 | if (memcmp(path + pathlen - len, s, len)) | |
121 | continue; | |
122 | if (pathlen > len && path[pathlen - len - 1] != '/') | |
123 | continue; | |
124 | *s = 0; | |
125 | return (i + 1); | |
126 | } | |
127 | return 0; | |
128 | } | |
129 | ||
130 | struct refspec { | |
131 | char *src; | |
132 | char *dst; | |
133 | char force; | |
134 | }; | |
135 | ||
136 | /* | |
137 | * A:B means fast forward remote B with local A. | |
138 | * +A:B means overwrite remote B with local A. | |
139 | * +A is a shorthand for +A:A. | |
140 | * A is a shorthand for A:A. | |
141 | * :B means delete remote B. | |
142 | */ | |
143 | static struct refspec *parse_ref_spec(int nr_refspec, char **refspec) | |
144 | { | |
145 | int i; | |
146 | struct refspec *rs = xcalloc(sizeof(*rs), (nr_refspec + 1)); | |
147 | for (i = 0; i < nr_refspec; i++) { | |
148 | char *sp, *dp, *ep; | |
149 | sp = refspec[i]; | |
150 | if (*sp == '+') { | |
151 | rs[i].force = 1; | |
152 | sp++; | |
153 | } | |
154 | ep = strchr(sp, ':'); | |
155 | if (ep) { | |
156 | dp = ep + 1; | |
157 | *ep = 0; | |
158 | } | |
159 | else | |
160 | dp = sp; | |
161 | rs[i].src = sp; | |
162 | rs[i].dst = dp; | |
163 | } | |
164 | rs[nr_refspec].src = rs[nr_refspec].dst = NULL; | |
165 | return rs; | |
166 | } | |
167 | ||
168 | static int count_refspec_match(const char *pattern, | |
169 | struct ref *refs, | |
170 | struct ref **matched_ref) | |
171 | { | |
172 | int patlen = strlen(pattern); | |
173 | struct ref *matched_weak = NULL; | |
174 | struct ref *matched = NULL; | |
175 | int weak_match = 0; | |
176 | int match = 0; | |
177 | ||
178 | for (weak_match = match = 0; refs; refs = refs->next) { | |
179 | char *name = refs->name; | |
180 | int namelen = strlen(name); | |
181 | int weak_match; | |
182 | ||
183 | if (namelen < patlen || | |
184 | memcmp(name + namelen - patlen, pattern, patlen)) | |
185 | continue; | |
186 | if (namelen != patlen && name[namelen - patlen - 1] != '/') | |
187 | continue; | |
188 | ||
189 | /* A match is "weak" if it is with refs outside | |
190 | * heads or tags, and did not specify the pattern | |
191 | * in full (e.g. "refs/remotes/origin/master") or at | |
192 | * least from the toplevel (e.g. "remotes/origin/master"); | |
193 | * otherwise "git push $URL master" would result in | |
194 | * ambiguity between remotes/origin/master and heads/master | |
195 | * at the remote site. | |
196 | */ | |
197 | if (namelen != patlen && | |
198 | patlen != namelen - 5 && | |
199 | prefixcmp(name, "refs/heads/") && | |
200 | prefixcmp(name, "refs/tags/")) { | |
201 | /* We want to catch the case where only weak | |
202 | * matches are found and there are multiple | |
203 | * matches, and where more than one strong | |
204 | * matches are found, as ambiguous. One | |
205 | * strong match with zero or more weak matches | |
206 | * are acceptable as a unique match. | |
207 | */ | |
208 | matched_weak = refs; | |
209 | weak_match++; | |
210 | } | |
211 | else { | |
212 | matched = refs; | |
213 | match++; | |
214 | } | |
215 | } | |
216 | if (!matched) { | |
217 | *matched_ref = matched_weak; | |
218 | return weak_match; | |
219 | } | |
220 | else { | |
221 | *matched_ref = matched; | |
222 | return match; | |
223 | } | |
224 | } | |
225 | ||
226 | static void link_dst_tail(struct ref *ref, struct ref ***tail) | |
227 | { | |
228 | **tail = ref; | |
229 | *tail = &ref->next; | |
230 | **tail = NULL; | |
231 | } | |
232 | ||
233 | static struct ref *try_explicit_object_name(const char *name) | |
234 | { | |
235 | unsigned char sha1[20]; | |
236 | struct ref *ref; | |
237 | int len; | |
238 | ||
239 | if (!*name) { | |
240 | ref = xcalloc(1, sizeof(*ref) + 20); | |
241 | strcpy(ref->name, "(delete)"); | |
242 | hashclr(ref->new_sha1); | |
243 | return ref; | |
244 | } | |
245 | if (get_sha1(name, sha1)) | |
246 | return NULL; | |
247 | len = strlen(name) + 1; | |
248 | ref = xcalloc(1, sizeof(*ref) + len); | |
249 | memcpy(ref->name, name, len); | |
250 | hashcpy(ref->new_sha1, sha1); | |
251 | return ref; | |
252 | } | |
253 | ||
254 | static int match_explicit_refs(struct ref *src, struct ref *dst, | |
255 | struct ref ***dst_tail, struct refspec *rs) | |
256 | { | |
257 | int i, errs; | |
258 | for (i = errs = 0; rs[i].src; i++) { | |
259 | struct ref *matched_src, *matched_dst; | |
260 | ||
261 | matched_src = matched_dst = NULL; | |
262 | switch (count_refspec_match(rs[i].src, src, &matched_src)) { | |
263 | case 1: | |
264 | break; | |
265 | case 0: | |
266 | /* The source could be in the get_sha1() format | |
267 | * not a reference name. :refs/other is a | |
268 | * way to delete 'other' ref at the remote end. | |
269 | */ | |
270 | matched_src = try_explicit_object_name(rs[i].src); | |
271 | if (matched_src) | |
272 | break; | |
273 | errs = 1; | |
274 | error("src refspec %s does not match any.", | |
275 | rs[i].src); | |
276 | break; | |
277 | default: | |
278 | errs = 1; | |
279 | error("src refspec %s matches more than one.", | |
280 | rs[i].src); | |
281 | break; | |
282 | } | |
283 | switch (count_refspec_match(rs[i].dst, dst, &matched_dst)) { | |
284 | case 1: | |
285 | break; | |
286 | case 0: | |
287 | if (!memcmp(rs[i].dst, "refs/", 5)) { | |
288 | int len = strlen(rs[i].dst) + 1; | |
289 | matched_dst = xcalloc(1, sizeof(*dst) + len); | |
290 | memcpy(matched_dst->name, rs[i].dst, len); | |
291 | link_dst_tail(matched_dst, dst_tail); | |
292 | } | |
293 | else if (!strcmp(rs[i].src, rs[i].dst) && | |
294 | matched_src) { | |
295 | /* pushing "master:master" when | |
296 | * remote does not have master yet. | |
297 | */ | |
298 | int len = strlen(matched_src->name) + 1; | |
299 | matched_dst = xcalloc(1, sizeof(*dst) + len); | |
300 | memcpy(matched_dst->name, matched_src->name, | |
301 | len); | |
302 | link_dst_tail(matched_dst, dst_tail); | |
303 | } | |
304 | else { | |
305 | errs = 1; | |
306 | error("dst refspec %s does not match any " | |
307 | "existing ref on the remote and does " | |
308 | "not start with refs/.", rs[i].dst); | |
309 | } | |
310 | break; | |
311 | default: | |
312 | errs = 1; | |
313 | error("dst refspec %s matches more than one.", | |
314 | rs[i].dst); | |
315 | break; | |
316 | } | |
317 | if (errs) | |
318 | continue; | |
319 | if (matched_dst->peer_ref) { | |
320 | errs = 1; | |
321 | error("dst ref %s receives from more than one src.", | |
322 | matched_dst->name); | |
323 | } | |
324 | else { | |
325 | matched_dst->peer_ref = matched_src; | |
326 | matched_dst->force = rs[i].force; | |
327 | } | |
328 | } | |
329 | return -errs; | |
330 | } | |
331 | ||
332 | static struct ref *find_ref_by_name(struct ref *list, const char *name) | |
333 | { | |
334 | for ( ; list; list = list->next) | |
335 | if (!strcmp(list->name, name)) | |
336 | return list; | |
337 | return NULL; | |
338 | } | |
339 | ||
340 | int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail, | |
341 | int nr_refspec, char **refspec, int all) | |
342 | { | |
343 | struct refspec *rs = parse_ref_spec(nr_refspec, refspec); | |
344 | ||
345 | if (nr_refspec) | |
346 | return match_explicit_refs(src, dst, dst_tail, rs); | |
347 | ||
348 | /* pick the remainder */ | |
349 | for ( ; src; src = src->next) { | |
350 | struct ref *dst_peer; | |
351 | if (src->peer_ref) | |
352 | continue; | |
353 | dst_peer = find_ref_by_name(dst, src->name); | |
354 | if ((dst_peer && dst_peer->peer_ref) || (!dst_peer && !all)) | |
355 | continue; | |
356 | if (!dst_peer) { | |
357 | /* Create a new one and link it */ | |
358 | int len = strlen(src->name) + 1; | |
359 | dst_peer = xcalloc(1, sizeof(*dst_peer) + len); | |
360 | memcpy(dst_peer->name, src->name, len); | |
361 | hashcpy(dst_peer->new_sha1, src->new_sha1); | |
362 | link_dst_tail(dst_peer, dst_tail); | |
363 | } | |
364 | dst_peer->peer_ref = src; | |
365 | } | |
366 | return 0; | |
367 | } | |
368 | ||
369 | enum protocol { | |
370 | PROTO_LOCAL = 1, | |
371 | PROTO_SSH, | |
372 | PROTO_GIT, | |
373 | }; | |
374 | ||
375 | static enum protocol get_protocol(const char *name) | |
376 | { | |
377 | if (!strcmp(name, "ssh")) | |
378 | return PROTO_SSH; | |
379 | if (!strcmp(name, "git")) | |
380 | return PROTO_GIT; | |
381 | if (!strcmp(name, "git+ssh")) | |
382 | return PROTO_SSH; | |
383 | if (!strcmp(name, "ssh+git")) | |
384 | return PROTO_SSH; | |
385 | die("I don't handle protocol '%s'", name); | |
386 | } | |
387 | ||
388 | #define STR_(s) # s | |
389 | #define STR(s) STR_(s) | |
390 | ||
391 | #ifndef NO_IPV6 | |
392 | ||
393 | /* | |
394 | * Returns a connected socket() fd, or else die()s. | |
395 | */ | |
396 | static int git_tcp_connect_sock(char *host) | |
397 | { | |
398 | int sockfd = -1, saved_errno = 0; | |
399 | char *colon, *end; | |
400 | const char *port = STR(DEFAULT_GIT_PORT); | |
401 | struct addrinfo hints, *ai0, *ai; | |
402 | int gai; | |
403 | ||
404 | if (host[0] == '[') { | |
405 | end = strchr(host + 1, ']'); | |
406 | if (end) { | |
407 | *end = 0; | |
408 | end++; | |
409 | host++; | |
410 | } else | |
411 | end = host; | |
412 | } else | |
413 | end = host; | |
414 | colon = strchr(end, ':'); | |
415 | ||
416 | if (colon) { | |
417 | *colon = 0; | |
418 | port = colon + 1; | |
419 | } | |
420 | ||
421 | memset(&hints, 0, sizeof(hints)); | |
422 | hints.ai_socktype = SOCK_STREAM; | |
423 | hints.ai_protocol = IPPROTO_TCP; | |
424 | ||
425 | gai = getaddrinfo(host, port, &hints, &ai); | |
426 | if (gai) | |
427 | die("Unable to look up %s (%s)", host, gai_strerror(gai)); | |
428 | ||
429 | for (ai0 = ai; ai; ai = ai->ai_next) { | |
430 | sockfd = socket(ai->ai_family, | |
431 | ai->ai_socktype, ai->ai_protocol); | |
432 | if (sockfd < 0) { | |
433 | saved_errno = errno; | |
434 | continue; | |
435 | } | |
436 | if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) { | |
437 | saved_errno = errno; | |
438 | close(sockfd); | |
439 | sockfd = -1; | |
440 | continue; | |
441 | } | |
442 | break; | |
443 | } | |
444 | ||
445 | freeaddrinfo(ai0); | |
446 | ||
447 | if (sockfd < 0) | |
448 | die("unable to connect a socket (%s)", strerror(saved_errno)); | |
449 | ||
450 | return sockfd; | |
451 | } | |
452 | ||
453 | #else /* NO_IPV6 */ | |
454 | ||
455 | /* | |
456 | * Returns a connected socket() fd, or else die()s. | |
457 | */ | |
458 | static int git_tcp_connect_sock(char *host) | |
459 | { | |
460 | int sockfd = -1, saved_errno = 0; | |
461 | char *colon, *end; | |
462 | char *port = STR(DEFAULT_GIT_PORT), *ep; | |
463 | struct hostent *he; | |
464 | struct sockaddr_in sa; | |
465 | char **ap; | |
466 | unsigned int nport; | |
467 | ||
468 | if (host[0] == '[') { | |
469 | end = strchr(host + 1, ']'); | |
470 | if (end) { | |
471 | *end = 0; | |
472 | end++; | |
473 | host++; | |
474 | } else | |
475 | end = host; | |
476 | } else | |
477 | end = host; | |
478 | colon = strchr(end, ':'); | |
479 | ||
480 | if (colon) { | |
481 | *colon = 0; | |
482 | port = colon + 1; | |
483 | } | |
484 | ||
485 | he = gethostbyname(host); | |
486 | if (!he) | |
487 | die("Unable to look up %s (%s)", host, hstrerror(h_errno)); | |
488 | nport = strtoul(port, &ep, 10); | |
489 | if ( ep == port || *ep ) { | |
490 | /* Not numeric */ | |
491 | struct servent *se = getservbyname(port,"tcp"); | |
492 | if ( !se ) | |
493 | die("Unknown port %s\n", port); | |
494 | nport = se->s_port; | |
495 | } | |
496 | ||
497 | for (ap = he->h_addr_list; *ap; ap++) { | |
498 | sockfd = socket(he->h_addrtype, SOCK_STREAM, 0); | |
499 | if (sockfd < 0) { | |
500 | saved_errno = errno; | |
501 | continue; | |
502 | } | |
503 | ||
504 | memset(&sa, 0, sizeof sa); | |
505 | sa.sin_family = he->h_addrtype; | |
506 | sa.sin_port = htons(nport); | |
507 | memcpy(&sa.sin_addr, *ap, he->h_length); | |
508 | ||
509 | if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) { | |
510 | saved_errno = errno; | |
511 | close(sockfd); | |
512 | sockfd = -1; | |
513 | continue; | |
514 | } | |
515 | break; | |
516 | } | |
517 | ||
518 | if (sockfd < 0) | |
519 | die("unable to connect a socket (%s)", strerror(saved_errno)); | |
520 | ||
521 | return sockfd; | |
522 | } | |
523 | ||
524 | #endif /* NO_IPV6 */ | |
525 | ||
526 | ||
527 | static void git_tcp_connect(int fd[2], char *host) | |
528 | { | |
529 | int sockfd = git_tcp_connect_sock(host); | |
530 | ||
531 | fd[0] = sockfd; | |
532 | fd[1] = dup(sockfd); | |
533 | } | |
534 | ||
535 | ||
536 | static char *git_proxy_command; | |
537 | static const char *rhost_name; | |
538 | static int rhost_len; | |
539 | ||
540 | static int git_proxy_command_options(const char *var, const char *value) | |
541 | { | |
542 | if (!strcmp(var, "core.gitproxy")) { | |
543 | const char *for_pos; | |
544 | int matchlen = -1; | |
545 | int hostlen; | |
546 | ||
547 | if (git_proxy_command) | |
548 | return 0; | |
549 | /* [core] | |
550 | * ;# matches www.kernel.org as well | |
551 | * gitproxy = netcatter-1 for kernel.org | |
552 | * gitproxy = netcatter-2 for sample.xz | |
553 | * gitproxy = netcatter-default | |
554 | */ | |
555 | for_pos = strstr(value, " for "); | |
556 | if (!for_pos) | |
557 | /* matches everybody */ | |
558 | matchlen = strlen(value); | |
559 | else { | |
560 | hostlen = strlen(for_pos + 5); | |
561 | if (rhost_len < hostlen) | |
562 | matchlen = -1; | |
563 | else if (!strncmp(for_pos + 5, | |
564 | rhost_name + rhost_len - hostlen, | |
565 | hostlen) && | |
566 | ((rhost_len == hostlen) || | |
567 | rhost_name[rhost_len - hostlen -1] == '.')) | |
568 | matchlen = for_pos - value; | |
569 | else | |
570 | matchlen = -1; | |
571 | } | |
572 | if (0 <= matchlen) { | |
573 | /* core.gitproxy = none for kernel.org */ | |
574 | if (matchlen == 4 && | |
575 | !memcmp(value, "none", 4)) | |
576 | matchlen = 0; | |
577 | git_proxy_command = xmalloc(matchlen + 1); | |
578 | memcpy(git_proxy_command, value, matchlen); | |
579 | git_proxy_command[matchlen] = 0; | |
580 | } | |
581 | return 0; | |
582 | } | |
583 | ||
584 | return git_default_config(var, value); | |
585 | } | |
586 | ||
587 | static int git_use_proxy(const char *host) | |
588 | { | |
589 | rhost_name = host; | |
590 | rhost_len = strlen(host); | |
591 | git_proxy_command = getenv("GIT_PROXY_COMMAND"); | |
592 | git_config(git_proxy_command_options); | |
593 | rhost_name = NULL; | |
594 | return (git_proxy_command && *git_proxy_command); | |
595 | } | |
596 | ||
597 | static void git_proxy_connect(int fd[2], char *host) | |
598 | { | |
599 | const char *port = STR(DEFAULT_GIT_PORT); | |
600 | char *colon, *end; | |
601 | int pipefd[2][2]; | |
602 | pid_t pid; | |
603 | ||
604 | if (host[0] == '[') { | |
605 | end = strchr(host + 1, ']'); | |
606 | if (end) { | |
607 | *end = 0; | |
608 | end++; | |
609 | host++; | |
610 | } else | |
611 | end = host; | |
612 | } else | |
613 | end = host; | |
614 | colon = strchr(end, ':'); | |
615 | ||
616 | if (colon) { | |
617 | *colon = 0; | |
618 | port = colon + 1; | |
619 | } | |
620 | ||
621 | if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0) | |
622 | die("unable to create pipe pair for communication"); | |
623 | pid = fork(); | |
624 | if (!pid) { | |
625 | dup2(pipefd[1][0], 0); | |
626 | dup2(pipefd[0][1], 1); | |
627 | close(pipefd[0][0]); | |
628 | close(pipefd[0][1]); | |
629 | close(pipefd[1][0]); | |
630 | close(pipefd[1][1]); | |
631 | execlp(git_proxy_command, git_proxy_command, host, port, NULL); | |
632 | die("exec failed"); | |
633 | } | |
634 | if (pid < 0) | |
635 | die("fork failed"); | |
636 | fd[0] = pipefd[0][0]; | |
637 | fd[1] = pipefd[1][1]; | |
638 | close(pipefd[0][1]); | |
639 | close(pipefd[1][0]); | |
640 | } | |
641 | ||
642 | #define MAX_CMD_LEN 1024 | |
643 | ||
644 | /* | |
645 | * This returns 0 if the transport protocol does not need fork(2), | |
646 | * or a process id if it does. Once done, finish the connection | |
647 | * with finish_connect() with the value returned from this function | |
648 | * (it is safe to call finish_connect() with 0 to support the former | |
649 | * case). | |
650 | * | |
651 | * Does not return a negative value on error; it just dies. | |
652 | */ | |
653 | pid_t git_connect(int fd[2], char *url, const char *prog) | |
654 | { | |
655 | char *host, *path = url; | |
656 | char *end; | |
657 | int c; | |
658 | int pipefd[2][2]; | |
659 | pid_t pid; | |
660 | enum protocol protocol = PROTO_LOCAL; | |
661 | int free_path = 0; | |
662 | ||
663 | /* Without this we cannot rely on waitpid() to tell | |
664 | * what happened to our children. | |
665 | */ | |
666 | signal(SIGCHLD, SIG_DFL); | |
667 | ||
668 | host = strstr(url, "://"); | |
669 | if(host) { | |
670 | *host = '\0'; | |
671 | protocol = get_protocol(url); | |
672 | host += 3; | |
673 | c = '/'; | |
674 | } else { | |
675 | host = url; | |
676 | c = ':'; | |
677 | } | |
678 | ||
679 | if (host[0] == '[') { | |
680 | end = strchr(host + 1, ']'); | |
681 | if (end) { | |
682 | *end = 0; | |
683 | end++; | |
684 | host++; | |
685 | } else | |
686 | end = host; | |
687 | } else | |
688 | end = host; | |
689 | ||
690 | path = strchr(end, c); | |
691 | if (c == ':') { | |
692 | if (path) { | |
693 | protocol = PROTO_SSH; | |
694 | *path++ = '\0'; | |
695 | } else | |
696 | path = host; | |
697 | } | |
698 | ||
699 | if (!path || !*path) | |
700 | die("No path specified. See 'man git-pull' for valid url syntax"); | |
701 | ||
702 | /* | |
703 | * null-terminate hostname and point path to ~ for URL's like this: | |
704 | * ssh://host.xz/~user/repo | |
705 | */ | |
706 | if (protocol != PROTO_LOCAL && host != url) { | |
707 | char *ptr = path; | |
708 | if (path[1] == '~') | |
709 | path++; | |
710 | else { | |
711 | path = xstrdup(ptr); | |
712 | free_path = 1; | |
713 | } | |
714 | ||
715 | *ptr = '\0'; | |
716 | } | |
717 | ||
718 | if (protocol == PROTO_GIT) { | |
719 | /* These underlying connection commands die() if they | |
720 | * cannot connect. | |
721 | */ | |
722 | char *target_host = xstrdup(host); | |
723 | if (git_use_proxy(host)) | |
724 | git_proxy_connect(fd, host); | |
725 | else | |
726 | git_tcp_connect(fd, host); | |
727 | /* | |
728 | * Separate original protocol components prog and path | |
729 | * from extended components with a NUL byte. | |
730 | */ | |
731 | packet_write(fd[1], | |
732 | "%s %s%chost=%s%c", | |
733 | prog, path, 0, | |
734 | target_host, 0); | |
735 | free(target_host); | |
736 | if (free_path) | |
737 | free(path); | |
738 | return 0; | |
739 | } | |
740 | ||
741 | if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0) | |
742 | die("unable to create pipe pair for communication"); | |
743 | pid = fork(); | |
744 | if (pid < 0) | |
745 | die("unable to fork"); | |
746 | if (!pid) { | |
747 | char command[MAX_CMD_LEN]; | |
748 | char *posn = command; | |
749 | int size = MAX_CMD_LEN; | |
750 | int of = 0; | |
751 | ||
752 | of |= add_to_string(&posn, &size, prog, 0); | |
753 | of |= add_to_string(&posn, &size, " ", 0); | |
754 | of |= add_to_string(&posn, &size, path, 1); | |
755 | ||
756 | if (of) | |
757 | die("command line too long"); | |
758 | ||
759 | dup2(pipefd[1][0], 0); | |
760 | dup2(pipefd[0][1], 1); | |
761 | close(pipefd[0][0]); | |
762 | close(pipefd[0][1]); | |
763 | close(pipefd[1][0]); | |
764 | close(pipefd[1][1]); | |
765 | if (protocol == PROTO_SSH) { | |
766 | const char *ssh, *ssh_basename; | |
767 | ssh = getenv("GIT_SSH"); | |
768 | if (!ssh) ssh = "ssh"; | |
769 | ssh_basename = strrchr(ssh, '/'); | |
770 | if (!ssh_basename) | |
771 | ssh_basename = ssh; | |
772 | else | |
773 | ssh_basename++; | |
774 | execlp(ssh, ssh_basename, host, command, NULL); | |
775 | } | |
776 | else { | |
777 | unsetenv(ALTERNATE_DB_ENVIRONMENT); | |
778 | unsetenv(DB_ENVIRONMENT); | |
779 | unsetenv(GIT_DIR_ENVIRONMENT); | |
780 | unsetenv(GRAFT_ENVIRONMENT); | |
781 | unsetenv(INDEX_ENVIRONMENT); | |
782 | execlp("sh", "sh", "-c", command, NULL); | |
783 | } | |
784 | die("exec failed"); | |
785 | } | |
786 | fd[0] = pipefd[0][0]; | |
787 | fd[1] = pipefd[1][1]; | |
788 | close(pipefd[0][1]); | |
789 | close(pipefd[1][0]); | |
790 | if (free_path) | |
791 | free(path); | |
792 | return pid; | |
793 | } | |
794 | ||
795 | int finish_connect(pid_t pid) | |
796 | { | |
797 | if (pid == 0) | |
798 | return 0; | |
799 | ||
800 | while (waitpid(pid, NULL, 0) < 0) { | |
801 | if (errno != EINTR) | |
802 | return -1; | |
803 | } | |
804 | return 0; | |
805 | } |