ssh-push.c

   1 #include "cache.h"
   2 #include "rsh.h"
   3 #include "refs.h"
   4
   5 #include <string.h>
   6
   7 static unsigned char local_version = 1;
   8 static unsigned char remote_version = 0;
   9
  10 static int verbose = 0;
  11
  12 static int serve_object(int fd_in, int fd_out) {
  13         ssize_t size;
  14         unsigned char sha1[20];
  15         signed char remote;
  16         int posn = 0;
  17         do {
  18                 size = read(fd_in, sha1 + posn, 20 - posn);
  19                 if (size < 0) {
  20                         perror("git-ssh-push: read ");
  21                         return -1;
  22                 }
  23                 if (!size)
  24                         return -1;
  25                 posn += size;
  26         } while (posn < 20);
  27
  28         if (verbose)
  29                 fprintf(stderr, "Serving %s\n", sha1_to_hex(sha1));
  30
  31         remote = 0;
  32
  33         if (!has_sha1_file(sha1)) {
  34                 fprintf(stderr, "git-ssh-push: could not find %s\n",
  35                         sha1_to_hex(sha1));
  36                 remote = -1;
  37         }
  38
  39         write(fd_out, &remote, 1);
  40
  41         if (remote < 0)
  42                 return 0;
  43
  44         return write_sha1_to_fd(fd_out, sha1);
  45 }
  46
  47 static int serve_version(int fd_in, int fd_out)
  48 {
  49         if (read(fd_in, &remote_version, 1) < 1)
  50                 return -1;
  51         write(fd_out, &local_version, 1);
  52         return 0;
  53 }
  54
  55 static int serve_ref(int fd_in, int fd_out)
  56 {
  57         char ref[PATH_MAX];
  58         unsigned char sha1[20];
  59         int posn = 0;
  60         signed char remote = 0;
  61         do {
  62                 if (read(fd_in, ref + posn, 1) < 1)
  63                         return -1;
  64                 posn++;
  65         } while (ref[posn - 1]);
  66
  67         if (verbose)
  68                 fprintf(stderr, "Serving %s\n", ref);
  69
  70         if (get_ref_sha1(ref, sha1))
  71                 remote = -1;
  72         write(fd_out, &remote, 1);
  73         if (remote)
  74                 return 0;
  75         write(fd_out, sha1, 20);
  76         return 0;
  77 }
  78
  79
  80 static void service(int fd_in, int fd_out) {
  81         char type;
  82         int retval;
  83         do {
  84                 retval = read(fd_in, &type, 1);
  85                 if (retval < 1) {
  86                         if (retval < 0)
  87                                 perror("git-ssh-push: read ");
  88                         return;
  89                 }
  90                 if (type == 'v' && serve_version(fd_in, fd_out))
  91                         return;
  92                 if (type == 'o' && serve_object(fd_in, fd_out))
  93                         return;
  94                 if (type == 'r' && serve_ref(fd_in, fd_out))
  95                         return;
  96         } while (1);
  97 }
  98
  99 static const char ssh_push_usage[] =
 100         "git-ssh-push [-c] [-t] [-a] [-w ref] commit-id url";
 101
 102 int main(int argc, char **argv)
 103 {
 104         int arg = 1;
 105         char *commit_id;
 106         char *url;
 107         int fd_in, fd_out;
 108         const char *prog;
 109         unsigned char sha1[20];
 110         char hex[41];
 111
 112         prog = getenv("GIT_SSH_PULL");
 113         if (!prog) prog = "git-ssh-pull";
 114         while (arg < argc && argv[arg][0] == '-') {
 115                 if (argv[arg][1] == 'w')
 116                         arg++;
 117                 arg++;
 118         }
 119         if (argc < arg + 2)
 120                 usage(ssh_push_usage);
 121         commit_id = argv[arg];
 122         url = argv[arg + 1];
 123         if (get_sha1(commit_id, sha1))
 124                 usage(ssh_push_usage);
 125         memcpy(hex, sha1_to_hex(sha1), sizeof(hex));
 126         argv[arg] = hex;
 127
 128         if (setup_connection(&fd_in, &fd_out, prog, url, arg, argv + 1))
 129                 return 1;
 130
 131         service(fd_in, fd_out);
 132         return 0;
 133 }