ssh-upload.c

   1 #ifndef COUNTERPART_ENV_NAME
   2 #define COUNTERPART_ENV_NAME "GIT_SSH_FETCH"
   3 #endif
   4 #ifndef COUNTERPART_PROGRAM_NAME
   5 #define COUNTERPART_PROGRAM_NAME "git-ssh-fetch"
   6 #endif
   7 #ifndef MY_PROGRAM_NAME
   8 #define MY_PROGRAM_NAME "git-ssh-upload"
   9 #endif
  10
  11 #include "cache.h"
  12 #include "rsh.h"
  13 #include "refs.h"
  14
  15 static unsigned char local_version = 1;
  16 static unsigned char remote_version;
  17
  18 static int verbose;
  19
  20 static int serve_object(int fd_in, int fd_out) {
  21         ssize_t size;
  22         unsigned char sha1[20];
  23         signed char remote;
  24
  25         size = read_in_full(fd_in, sha1, 20);
  26         if (size < 0) {
  27                 perror("git-ssh-upload: read ");
  28                 return -1;
  29         }
  30         if (!size)
  31                 return -1;
  32
  33         if (verbose)
  34                 fprintf(stderr, "Serving %s\n", sha1_to_hex(sha1));
  35
  36         remote = 0;
  37
  38         if (!has_sha1_file(sha1)) {
  39                 fprintf(stderr, "git-ssh-upload: could not find %s\n",
  40                         sha1_to_hex(sha1));
  41                 remote = -1;
  42         }
  43
  44         write(fd_out, &remote, 1);
  45
  46         if (remote < 0)
  47                 return 0;
  48
  49         return write_sha1_to_fd(fd_out, sha1);
  50 }
  51
  52 static int serve_version(int fd_in, int fd_out)
  53 {
  54         if (xread(fd_in, &remote_version, 1) < 1)
  55                 return -1;
  56         write(fd_out, &local_version, 1);
  57         return 0;
  58 }
  59
  60 static int serve_ref(int fd_in, int fd_out)
  61 {
  62         char ref[PATH_MAX];
  63         unsigned char sha1[20];
  64         int posn = 0;
  65         signed char remote = 0;
  66         do {
  67                 if (posn >= PATH_MAX || xread(fd_in, ref + posn, 1) < 1)
  68                         return -1;
  69                 posn++;
  70         } while (ref[posn - 1]);
  71
  72         if (verbose)
  73                 fprintf(stderr, "Serving %s\n", ref);
  74
  75         if (get_ref_sha1(ref, sha1))
  76                 remote = -1;
  77         write(fd_out, &remote, 1);
  78         if (remote)
  79                 return 0;
  80         write(fd_out, sha1, 20);
  81         return 0;
  82 }
  83
  84
  85 static void service(int fd_in, int fd_out) {
  86         char type;
  87         int retval;
  88         do {
  89                 retval = xread(fd_in, &type, 1);
  90                 if (retval < 1) {
  91                         if (retval < 0)
  92                                 perror("git-ssh-upload: read ");
  93                         return;
  94                 }
  95                 if (type == 'v' && serve_version(fd_in, fd_out))
  96                         return;
  97                 if (type == 'o' && serve_object(fd_in, fd_out))
  98                         return;
  99                 if (type == 'r' && serve_ref(fd_in, fd_out))
 100                         return;
 101         } while (1);
 102 }
 103
 104 static const char ssh_push_usage[] =
 105         MY_PROGRAM_NAME " [-c] [-t] [-a] [-w ref] commit-id url";
 106
 107 int main(int argc, char **argv)
 108 {
 109         int arg = 1;
 110         char *commit_id;
 111         char *url;
 112         int fd_in, fd_out;
 113         const char *prog;
 114         unsigned char sha1[20];
 115         char hex[41];
 116
 117         prog = getenv(COUNTERPART_ENV_NAME);
 118         if (!prog) prog = COUNTERPART_PROGRAM_NAME;
 119
 120         setup_git_directory();
 121
 122         while (arg < argc && argv[arg][0] == '-') {
 123                 if (argv[arg][1] == 'w')
 124                         arg++;
 125                 arg++;
 126         }
 127         if (argc < arg + 2)
 128                 usage(ssh_push_usage);
 129         commit_id = argv[arg];
 130         url = argv[arg + 1];
 131         if (get_sha1(commit_id, sha1))
 132                 die("Not a valid object name %s", commit_id);
 133         memcpy(hex, sha1_to_hex(sha1), sizeof(hex));
 134         argv[arg] = hex;
 135
 136         if (setup_connection(&fd_in, &fd_out, prog, url, arg, argv + 1))
 137                 return 1;
 138
 139         service(fd_in, fd_out);
 140         return 0;
 141 }