[PATCH] NUL terminate the object data in patch_delta()
[git.git] / rsh.c
1 #include "rsh.h"
2
3 #include <string.h>
4 #include <sys/types.h>
5 #include <sys/socket.h>
6
7 #include "cache.h"
8
9 #define COMMAND_SIZE 4096
10
11 int setup_connection(int *fd_in, int *fd_out, const char *remote_prog, 
12                      char *url, int rmt_argc, char **rmt_argv)
13 {
14         char *host;
15         char *path;
16         int sv[2];
17         char command[COMMAND_SIZE];
18         char *posn;
19         int i;
20
21         if (!strcmp(url, "-")) {
22                 *fd_in = 0;
23                 *fd_out = 1;
24                 return 0;
25         }
26
27         host = strstr(url, "//");
28         if (host) {
29                 host += 2;
30                 path = strchr(host, '/');
31         } else {
32                 host = url;
33                 path = strchr(host, ':');
34                 if (path)
35                         *(path++) = '\0';
36         }
37         if (!path) {
38                 return error("Bad URL: %s", url);
39         }
40         /* ssh <host> 'cd <path>; stdio-pull <arg...> <commit-id>' */
41         snprintf(command, COMMAND_SIZE, 
42                  "%s='%s' %s",
43                  GIT_DIR_ENVIRONMENT, path, remote_prog);
44         *path = '\0';
45         posn = command + strlen(command);
46         for (i = 0; i < rmt_argc; i++) {
47                 *(posn++) = ' ';
48                 strncpy(posn, rmt_argv[i], COMMAND_SIZE - (posn - command));
49                 posn += strlen(rmt_argv[i]);
50                 if (posn - command + 4 >= COMMAND_SIZE) {
51                         return error("Command line too long");
52                 }
53         }
54         strcpy(posn, " -");
55         if (socketpair(AF_UNIX, SOCK_STREAM, 0, sv)) {
56                 return error("Couldn't create socket");
57         }
58         if (!fork()) {
59                 const char *ssh, *ssh_basename;
60                 ssh = getenv("GIT_SSH");
61                 if (!ssh) ssh = "ssh";
62                 ssh_basename = strrchr(ssh, '/');
63                 if (!ssh_basename)
64                         ssh_basename = ssh;
65                 else
66                         ssh_basename++;
67                 close(sv[1]);
68                 dup2(sv[0], 0);
69                 dup2(sv[0], 1);
70                 execlp(ssh, ssh_basename, host, command, NULL);
71         }
72         close(sv[0]);
73         *fd_in = sv[1];
74         *fd_out = sv[1];
75         return 0;
76 }