ssh-fetch.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "rsh.h"
   4 #include "fetch.h"
   5 #include "refs.h"
   6
   7 static int fd_in;
   8 static int fd_out;
   9
  10 static unsigned char remote_version = 0;
  11 static unsigned char local_version = 1;
  12
  13 static ssize_t force_write(int fd, void *buffer, size_t length)
  14 {
  15         ssize_t ret = 0;
  16         while (ret < length) {
  17                 ssize_t size = write(fd, buffer + ret, length - ret);
  18                 if (size < 0) {
  19                         return size;
  20                 }
  21                 if (size == 0) {
  22                         return ret;
  23                 }
  24                 ret += size;
  25         }
  26         return ret;
  27 }
  28
  29 void prefetch(unsigned char *sha1)
  30 {
  31         char type = 'o';
  32         force_write(fd_out, &type, 1);
  33         force_write(fd_out, sha1, 20);
  34         //memcpy(requested + 20 * prefetches++, sha1, 20);
  35 }
  36
  37 static char conn_buf[4096];
  38 static size_t conn_buf_posn = 0;
  39
  40 int fetch(unsigned char *sha1)
  41 {
  42         int ret;
  43         signed char remote;
  44
  45         if (conn_buf_posn) {
  46                 remote = conn_buf[0];
  47                 memmove(conn_buf, conn_buf + 1, --conn_buf_posn);
  48         } else {
  49                 if (read(fd_in, &remote, 1) < 1)
  50                         return -1;
  51         }
  52         //fprintf(stderr, "Got %d\n", remote);
  53         if (remote < 0)
  54                 return remote;
  55         ret = write_sha1_from_fd(sha1, fd_in, conn_buf, 4096, &conn_buf_posn);
  56         if (!ret)
  57                 pull_say("got %s\n", sha1_to_hex(sha1));
  58         return ret;
  59 }
  60
  61 static int get_version(void)
  62 {
  63         char type = 'v';
  64         write(fd_out, &type, 1);
  65         write(fd_out, &local_version, 1);
  66         if (read(fd_in, &remote_version, 1) < 1) {
  67                 return error("Couldn't read version from remote end");
  68         }
  69         return 0;
  70 }
  71
  72 int fetch_ref(char *ref, unsigned char *sha1)
  73 {
  74         signed char remote;
  75         char type = 'r';
  76         write(fd_out, &type, 1);
  77         write(fd_out, ref, strlen(ref) + 1);
  78         read(fd_in, &remote, 1);
  79         if (remote < 0)
  80                 return remote;
  81         read(fd_in, sha1, 20);
  82         return 0;
  83 }
  84
  85 int main(int argc, char **argv)
  86 {
  87         char *commit_id;
  88         char *url;
  89         int arg = 1;
  90         const char *prog;
  91
  92         prog = getenv("GIT_SSH_PUSH");
  93         if (!prog) prog = "git-ssh-upload";
  94
  95         while (arg < argc && argv[arg][0] == '-') {
  96                 if (argv[arg][1] == 't') {
  97                         get_tree = 1;
  98                 } else if (argv[arg][1] == 'c') {
  99                         get_history = 1;
 100                 } else if (argv[arg][1] == 'a') {
 101                         get_all = 1;
 102                         get_tree = 1;
 103                         get_history = 1;
 104                 } else if (argv[arg][1] == 'v') {
 105                         get_verbosely = 1;
 106                 } else if (argv[arg][1] == 'w') {
 107                         write_ref = argv[arg + 1];
 108                         arg++;
 109                 }
 110                 arg++;
 111         }
 112         if (argc < arg + 2) {
 113                 usage("git-ssh-fetch [-c] [-t] [-a] [-v] [-d] [--recover] [-w ref] commit-id url");
 114                 return 1;
 115         }
 116         commit_id = argv[arg];
 117         url = argv[arg + 1];
 118
 119         if (setup_connection(&fd_in, &fd_out, prog, url, arg, argv + 1))
 120                 return 1;
 121
 122         if (get_version())
 123                 return 1;
 124
 125         if (pull(commit_id))
 126                 return 1;
 127
 128         return 0;
 129 }