upload-pack: fix thinko in common-commit finder code.
[git/trast.git] / connect.c
blob57e25a34bcd7cfc8aa0f2694286c5e9cb3b145ae
1 #include "cache.h"
2 #include "pkt-line.h"
3 #include "quote.h"
4 #include "refs.h"
5 #include <sys/wait.h>
6 #include <sys/socket.h>
7 #include <netinet/in.h>
8 #include <arpa/inet.h>
9 #include <netdb.h>
12 * Read all the refs from the other end
14 struct ref **get_remote_heads(int in, struct ref **list,
15 int nr_match, char **match, int ignore_funny)
17 *list = NULL;
18 for (;;) {
19 struct ref *ref;
20 unsigned char old_sha1[20];
21 static char buffer[1000];
22 char *name;
23 int len;
25 len = packet_read_line(in, buffer, sizeof(buffer));
26 if (!len)
27 break;
28 if (buffer[len-1] == '\n')
29 buffer[--len] = 0;
31 if (len < 42 || get_sha1_hex(buffer, old_sha1) || buffer[40] != ' ')
32 die("protocol error: expected sha/ref, got '%s'", buffer);
33 name = buffer + 41;
35 if (ignore_funny && 45 < len && !memcmp(name, "refs/", 5) &&
36 check_ref_format(name + 5))
37 continue;
39 if (nr_match && !path_match(name, nr_match, match))
40 continue;
41 ref = xcalloc(1, sizeof(*ref) + len - 40);
42 memcpy(ref->old_sha1, old_sha1, 20);
43 memcpy(ref->name, buffer + 41, len - 40);
44 *list = ref;
45 list = &ref->next;
47 return list;
50 int get_ack(int fd, unsigned char *result_sha1)
52 static char line[1000];
53 int len = packet_read_line(fd, line, sizeof(line));
55 if (!len)
56 die("git-fetch-pack: expected ACK/NAK, got EOF");
57 if (line[len-1] == '\n')
58 line[--len] = 0;
59 if (!strcmp(line, "NAK"))
60 return 0;
61 if (!strncmp(line, "ACK ", 3)) {
62 if (!get_sha1_hex(line+4, result_sha1)) {
63 if (strstr(line+45, "continue"))
64 return 2;
65 return 1;
68 die("git-fetch_pack: expected ACK/NAK, got '%s'", line);
71 int path_match(const char *path, int nr, char **match)
73 int i;
74 int pathlen = strlen(path);
76 for (i = 0; i < nr; i++) {
77 char *s = match[i];
78 int len = strlen(s);
80 if (!len || len > pathlen)
81 continue;
82 if (memcmp(path + pathlen - len, s, len))
83 continue;
84 if (pathlen > len && path[pathlen - len - 1] != '/')
85 continue;
86 *s = 0;
87 return 1;
89 return 0;
92 struct refspec {
93 char *src;
94 char *dst;
95 char force;
99 * A:B means fast forward remote B with local A.
100 * +A:B means overwrite remote B with local A.
101 * +A is a shorthand for +A:A.
102 * A is a shorthand for A:A.
104 static struct refspec *parse_ref_spec(int nr_refspec, char **refspec)
106 int i;
107 struct refspec *rs = xcalloc(sizeof(*rs), (nr_refspec + 1));
108 for (i = 0; i < nr_refspec; i++) {
109 char *sp, *dp, *ep;
110 sp = refspec[i];
111 if (*sp == '+') {
112 rs[i].force = 1;
113 sp++;
115 ep = strchr(sp, ':');
116 if (ep) {
117 dp = ep + 1;
118 *ep = 0;
120 else
121 dp = sp;
122 rs[i].src = sp;
123 rs[i].dst = dp;
125 rs[nr_refspec].src = rs[nr_refspec].dst = NULL;
126 return rs;
129 static int count_refspec_match(const char *pattern,
130 struct ref *refs,
131 struct ref **matched_ref)
133 int match;
134 int patlen = strlen(pattern);
136 for (match = 0; refs; refs = refs->next) {
137 char *name = refs->name;
138 int namelen = strlen(name);
139 if (namelen < patlen ||
140 memcmp(name + namelen - patlen, pattern, patlen))
141 continue;
142 if (namelen != patlen && name[namelen - patlen - 1] != '/')
143 continue;
144 match++;
145 *matched_ref = refs;
147 return match;
150 static void link_dst_tail(struct ref *ref, struct ref ***tail)
152 **tail = ref;
153 *tail = &ref->next;
154 **tail = NULL;
157 static struct ref *try_explicit_object_name(const char *name)
159 unsigned char sha1[20];
160 struct ref *ref;
161 int len;
162 if (get_sha1(name, sha1))
163 return NULL;
164 len = strlen(name) + 1;
165 ref = xcalloc(1, sizeof(*ref) + len);
166 memcpy(ref->name, name, len);
167 memcpy(ref->new_sha1, sha1, 20);
168 return ref;
171 static int match_explicit_refs(struct ref *src, struct ref *dst,
172 struct ref ***dst_tail, struct refspec *rs)
174 int i, errs;
175 for (i = errs = 0; rs[i].src; i++) {
176 struct ref *matched_src, *matched_dst;
178 matched_src = matched_dst = NULL;
179 switch (count_refspec_match(rs[i].src, src, &matched_src)) {
180 case 1:
181 break;
182 case 0:
183 /* The source could be in the get_sha1() format
184 * not a reference name.
186 matched_src = try_explicit_object_name(rs[i].src);
187 if (matched_src)
188 break;
189 errs = 1;
190 error("src refspec %s does not match any.",
191 rs[i].src);
192 break;
193 default:
194 errs = 1;
195 error("src refspec %s matches more than one.",
196 rs[i].src);
197 break;
199 switch (count_refspec_match(rs[i].dst, dst, &matched_dst)) {
200 case 1:
201 break;
202 case 0:
203 if (!memcmp(rs[i].dst, "refs/", 5)) {
204 int len = strlen(rs[i].dst) + 1;
205 matched_dst = xcalloc(1, sizeof(*dst) + len);
206 memcpy(matched_dst->name, rs[i].dst, len);
207 link_dst_tail(matched_dst, dst_tail);
209 else if (!strcmp(rs[i].src, rs[i].dst) &&
210 matched_src) {
211 /* pushing "master:master" when
212 * remote does not have master yet.
214 int len = strlen(matched_src->name) + 1;
215 matched_dst = xcalloc(1, sizeof(*dst) + len);
216 memcpy(matched_dst->name, matched_src->name,
217 len);
218 link_dst_tail(matched_dst, dst_tail);
220 else {
221 errs = 1;
222 error("dst refspec %s does not match any "
223 "existing ref on the remote and does "
224 "not start with refs/.", rs[i].dst);
226 break;
227 default:
228 errs = 1;
229 error("dst refspec %s matches more than one.",
230 rs[i].dst);
231 break;
233 if (errs)
234 continue;
235 if (matched_dst->peer_ref) {
236 errs = 1;
237 error("dst ref %s receives from more than one src.",
238 matched_dst->name);
240 else {
241 matched_dst->peer_ref = matched_src;
242 matched_dst->force = rs[i].force;
245 return -errs;
248 static struct ref *find_ref_by_name(struct ref *list, const char *name)
250 for ( ; list; list = list->next)
251 if (!strcmp(list->name, name))
252 return list;
253 return NULL;
256 int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
257 int nr_refspec, char **refspec, int all)
259 struct refspec *rs = parse_ref_spec(nr_refspec, refspec);
261 if (nr_refspec)
262 return match_explicit_refs(src, dst, dst_tail, rs);
264 /* pick the remainder */
265 for ( ; src; src = src->next) {
266 struct ref *dst_peer;
267 if (src->peer_ref)
268 continue;
269 dst_peer = find_ref_by_name(dst, src->name);
270 if ((dst_peer && dst_peer->peer_ref) || (!dst_peer && !all))
271 continue;
272 if (!dst_peer) {
273 /* Create a new one and link it */
274 int len = strlen(src->name) + 1;
275 dst_peer = xcalloc(1, sizeof(*dst_peer) + len);
276 memcpy(dst_peer->name, src->name, len);
277 memcpy(dst_peer->new_sha1, src->new_sha1, 20);
278 link_dst_tail(dst_peer, dst_tail);
280 dst_peer->peer_ref = src;
282 return 0;
285 enum protocol {
286 PROTO_LOCAL = 1,
287 PROTO_SSH,
288 PROTO_GIT,
291 static enum protocol get_protocol(const char *name)
293 if (!strcmp(name, "ssh"))
294 return PROTO_SSH;
295 if (!strcmp(name, "git"))
296 return PROTO_GIT;
297 if (!strcmp(name, "git+ssh"))
298 return PROTO_SSH;
299 if (!strcmp(name, "ssh+git"))
300 return PROTO_SSH;
301 die("I don't handle protocol '%s'", name);
304 #define STR_(s) # s
305 #define STR(s) STR_(s)
307 #ifndef NO_IPV6
309 static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
311 int sockfd = -1;
312 char *colon, *end;
313 char *port = STR(DEFAULT_GIT_PORT);
314 struct addrinfo hints, *ai0, *ai;
315 int gai;
317 if (host[0] == '[') {
318 end = strchr(host + 1, ']');
319 if (end) {
320 *end = 0;
321 end++;
322 host++;
323 } else
324 end = host;
325 } else
326 end = host;
327 colon = strchr(end, ':');
329 if (colon) {
330 *colon = 0;
331 port = colon + 1;
334 memset(&hints, 0, sizeof(hints));
335 hints.ai_socktype = SOCK_STREAM;
336 hints.ai_protocol = IPPROTO_TCP;
338 gai = getaddrinfo(host, port, &hints, &ai);
339 if (gai)
340 die("Unable to look up %s (%s)", host, gai_strerror(gai));
342 for (ai0 = ai; ai; ai = ai->ai_next) {
343 sockfd = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
344 if (sockfd < 0)
345 continue;
346 if (connect(sockfd, ai->ai_addr, ai->ai_addrlen) < 0) {
347 close(sockfd);
348 sockfd = -1;
349 continue;
351 break;
354 freeaddrinfo(ai0);
356 if (sockfd < 0)
357 die("unable to connect a socket (%s)", strerror(errno));
359 fd[0] = sockfd;
360 fd[1] = sockfd;
361 packet_write(sockfd, "%s %s\n", prog, path);
362 return 0;
365 #else /* NO_IPV6 */
367 static int git_tcp_connect(int fd[2], const char *prog, char *host, char *path)
369 int sockfd = -1;
370 char *colon, *end;
371 char *port = STR(DEFAULT_GIT_PORT), *ep;
372 struct hostent *he;
373 struct sockaddr_in sa;
374 char **ap;
375 unsigned int nport;
377 if (host[0] == '[') {
378 end = strchr(host + 1, ']');
379 if (end) {
380 *end = 0;
381 end++;
382 host++;
383 } else
384 end = host;
385 } else
386 end = host;
387 colon = strchr(end, ':');
389 if (colon) {
390 *colon = 0;
391 port = colon + 1;
395 he = gethostbyname(host);
396 if (!he)
397 die("Unable to look up %s (%s)", host, hstrerror(h_errno));
398 nport = strtoul(port, &ep, 10);
399 if ( ep == port || *ep ) {
400 /* Not numeric */
401 struct servent *se = getservbyname(port,"tcp");
402 if ( !se )
403 die("Unknown port %s\n", port);
404 nport = se->s_port;
407 for (ap = he->h_addr_list; *ap; ap++) {
408 sockfd = socket(he->h_addrtype, SOCK_STREAM, 0);
409 if (sockfd < 0)
410 continue;
412 memset(&sa, 0, sizeof sa);
413 sa.sin_family = he->h_addrtype;
414 sa.sin_port = htons(nport);
415 memcpy(&sa.sin_addr, ap, he->h_length);
417 if (connect(sockfd, (struct sockaddr *)&sa, sizeof sa) < 0) {
418 close(sockfd);
419 sockfd = -1;
420 continue;
422 break;
425 if (sockfd < 0)
426 die("unable to connect a socket (%s)", strerror(errno));
428 fd[0] = sockfd;
429 fd[1] = sockfd;
430 packet_write(sockfd, "%s %s\n", prog, path);
431 return 0;
434 #endif /* NO_IPV6 */
437 * Yeah, yeah, fixme. Need to pass in the heads etc.
439 int git_connect(int fd[2], char *url, const char *prog)
441 char command[1024];
442 char *host, *path;
443 char *colon;
444 int pipefd[2][2];
445 pid_t pid;
446 enum protocol protocol;
448 host = NULL;
449 path = url;
450 colon = strchr(url, ':');
451 protocol = PROTO_LOCAL;
452 if (colon) {
453 *colon = 0;
454 host = url;
455 path = colon+1;
456 protocol = PROTO_SSH;
457 if (!memcmp(path, "//", 2)) {
458 char *slash = strchr(path + 2, '/');
459 if (slash) {
460 int nr = slash - path - 2;
461 memmove(path, path+2, nr);
462 path[nr] = 0;
463 protocol = get_protocol(url);
464 host = path;
465 path = slash;
470 if (protocol == PROTO_GIT)
471 return git_tcp_connect(fd, prog, host, path);
473 if (pipe(pipefd[0]) < 0 || pipe(pipefd[1]) < 0)
474 die("unable to create pipe pair for communication");
475 pid = fork();
476 if (!pid) {
477 snprintf(command, sizeof(command), "%s %s", prog,
478 sq_quote(path));
479 dup2(pipefd[1][0], 0);
480 dup2(pipefd[0][1], 1);
481 close(pipefd[0][0]);
482 close(pipefd[0][1]);
483 close(pipefd[1][0]);
484 close(pipefd[1][1]);
485 if (protocol == PROTO_SSH) {
486 const char *ssh, *ssh_basename;
487 ssh = getenv("GIT_SSH");
488 if (!ssh) ssh = "ssh";
489 ssh_basename = strrchr(ssh, '/');
490 if (!ssh_basename)
491 ssh_basename = ssh;
492 else
493 ssh_basename++;
494 execlp(ssh, ssh_basename, host, command, NULL);
496 else
497 execlp("sh", "sh", "-c", command, NULL);
498 die("exec failed");
500 fd[0] = pipefd[0][0];
501 fd[1] = pipefd[1][1];
502 close(pipefd[0][1]);
503 close(pipefd[1][0]);
504 return pid;
507 int finish_connect(pid_t pid)
509 int ret;
511 for (;;) {
512 ret = waitpid(pid, NULL, 0);
513 if (!ret)
514 break;
515 if (errno != EINTR)
516 break;
518 return ret;