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         int posn = 0;
  25         do {
  26                 size = read(fd_in, sha1 + posn, 20 - posn);
  27                 if (size < 0) {
  28                         perror("git-ssh-upload: read ");
  29                         return -1;
  30                 }
  31                 if (!size)
  32                         return -1;
  33                 posn += size;
  34         } while (posn < 20);
  35
  36         if (verbose)
  37                 fprintf(stderr, "Serving %s\n", sha1_to_hex(sha1));
  38
  39         remote = 0;
  40
  41         if (!has_sha1_file(sha1)) {
  42                 fprintf(stderr, "git-ssh-upload: could not find %s\n",
  43                         sha1_to_hex(sha1));
  44                 remote = -1;
  45         }
  46
  47         write(fd_out, &remote, 1);
  48
  49         if (remote < 0)
  50                 return 0;
  51
  52         return write_sha1_to_fd(fd_out, sha1);
  53 }
  54
  55 static int serve_version(int fd_in, int fd_out)
  56 {
  57         if (read(fd_in, &remote_version, 1) < 1)
  58                 return -1;
  59         write(fd_out, &local_version, 1);
  60         return 0;
  61 }
  62
  63 static int serve_ref(int fd_in, int fd_out)
  64 {
  65         char ref[PATH_MAX];
  66         unsigned char sha1[20];
  67         int posn = 0;
  68         signed char remote = 0;
  69         do {
  70                 if (read(fd_in, ref + posn, 1) < 1)
  71                         return -1;
  72                 posn++;
  73         } while (ref[posn - 1]);
  74
  75         if (verbose)
  76                 fprintf(stderr, "Serving %s\n", ref);
  77
  78         if (get_ref_sha1(ref, sha1))
  79                 remote = -1;
  80         write(fd_out, &remote, 1);
  81         if (remote)
  82                 return 0;
  83         write(fd_out, sha1, 20);
  84         return 0;
  85 }
  86
  87
  88 static void service(int fd_in, int fd_out) {
  89         char type;
  90         int retval;
  91         do {
  92                 retval = read(fd_in, &type, 1);
  93                 if (retval < 1) {
  94                         if (retval < 0)
  95                                 perror("git-ssh-upload: read ");
  96                         return;
  97                 }
  98                 if (type == 'v' && serve_version(fd_in, fd_out))
  99                         return;
 100                 if (type == 'o' && serve_object(fd_in, fd_out))
 101                         return;
 102                 if (type == 'r' && serve_ref(fd_in, fd_out))
 103                         return;
 104         } while (1);
 105 }
 106
 107 static const char ssh_push_usage[] =
 108         MY_PROGRAM_NAME " [-c] [-t] [-a] [-w ref] commit-id url";
 109
 110 int main(int argc, char **argv)
 111 {
 112         int arg = 1;
 113         char *commit_id;
 114         char *url;
 115         int fd_in, fd_out;
 116         const char *prog;
 117         unsigned char sha1[20];
 118         char hex[41];
 119
 120         prog = getenv(COUNTERPART_ENV_NAME);
 121         if (!prog) prog = COUNTERPART_PROGRAM_NAME;
 122
 123         setup_git_directory();
 124
 125         while (arg < argc && argv[arg][0] == '-') {
 126                 if (argv[arg][1] == 'w')
 127                         arg++;
 128                 arg++;
 129         }
 130         if (argc < arg + 2)
 131                 usage(ssh_push_usage);
 132         commit_id = argv[arg];
 133         url = argv[arg + 1];
 134         if (get_sha1(commit_id, sha1))
 135                 die("Not a valid object name %s", commit_id);
 136         memcpy(hex, sha1_to_hex(sha1), sizeof(hex));
 137         argv[arg] = hex;
 138
 139         if (setup_connection(&fd_in, &fd_out, prog, url, arg, argv + 1))
 140                 return 1;
 141
 142         service(fd_in, fd_out);
 143         return 0;
 144 }