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