ssh-fetch.c

   1 #ifndef COUNTERPART_ENV_NAME
   2 #define COUNTERPART_ENV_NAME "GIT_SSH_UPLOAD"
   3 #endif
   4 #ifndef COUNTERPART_PROGRAM_NAME
   5 #define COUNTERPART_PROGRAM_NAME "git-ssh-upload"
   6 #endif
   7 #ifndef MY_PROGRAM_NAME
   8 #define MY_PROGRAM_NAME "git-ssh-fetch"
   9 #endif
  10
  11 #include "cache.h"
  12 #include "commit.h"
  13 #include "rsh.h"
  14 #include "fetch.h"
  15 #include "refs.h"
  16
  17 static int fd_in;
  18 static int fd_out;
  19
  20 static unsigned char remote_version = 0;
  21 static unsigned char local_version = 1;
  22
  23 static ssize_t force_write(int fd, void *buffer, size_t length)
  24 {
  25         ssize_t ret = 0;
  26         while (ret < length) {
  27                 ssize_t size = write(fd, buffer + ret, length - ret);
  28                 if (size < 0) {
  29                         return size;
  30                 }
  31                 if (size == 0) {
  32                         return ret;
  33                 }
  34                 ret += size;
  35         }
  36         return ret;
  37 }
  38
  39 void prefetch(unsigned char *sha1)
  40 {
  41         char type = 'o';
  42         force_write(fd_out, &type, 1);
  43         force_write(fd_out, sha1, 20);
  44         //memcpy(requested + 20 * prefetches++, sha1, 20);
  45 }
  46
  47 static char conn_buf[4096];
  48 static size_t conn_buf_posn = 0;
  49
  50 int fetch(unsigned char *sha1)
  51 {
  52         int ret;
  53         signed char remote;
  54
  55         if (conn_buf_posn) {
  56                 remote = conn_buf[0];
  57                 memmove(conn_buf, conn_buf + 1, --conn_buf_posn);
  58         } else {
  59                 if (read(fd_in, &remote, 1) < 1)
  60                         return -1;
  61         }
  62         //fprintf(stderr, "Got %d\n", remote);
  63         if (remote < 0)
  64                 return remote;
  65         ret = write_sha1_from_fd(sha1, fd_in, conn_buf, 4096, &conn_buf_posn);
  66         if (!ret)
  67                 pull_say("got %s\n", sha1_to_hex(sha1));
  68         return ret;
  69 }
  70
  71 static int get_version(void)
  72 {
  73         char type = 'v';
  74         write(fd_out, &type, 1);
  75         write(fd_out, &local_version, 1);
  76         if (read(fd_in, &remote_version, 1) < 1) {
  77                 return error("Couldn't read version from remote end");
  78         }
  79         return 0;
  80 }
  81
  82 int fetch_ref(char *ref, unsigned char *sha1)
  83 {
  84         signed char remote;
  85         char type = 'r';
  86         write(fd_out, &type, 1);
  87         write(fd_out, ref, strlen(ref) + 1);
  88         read(fd_in, &remote, 1);
  89         if (remote < 0)
  90                 return remote;
  91         read(fd_in, sha1, 20);
  92         return 0;
  93 }
  94
  95 static const char ssh_fetch_usage[] =
  96   MY_PROGRAM_NAME
  97   " [-c] [-t] [-a] [-v] [-d] [--recover] [-w ref] commit-id url";
  98 int main(int argc, char **argv)
  99 {
 100         char *commit_id;
 101         char *url;
 102         int arg = 1;
 103         const char *prog;
 104
 105         prog = getenv("GIT_SSH_PUSH");
 106         if (!prog) prog = "git-ssh-upload";
 107
 108         while (arg < argc && argv[arg][0] == '-') {
 109                 if (argv[arg][1] == 't') {
 110                         get_tree = 1;
 111                 } else if (argv[arg][1] == 'c') {
 112                         get_history = 1;
 113                 } else if (argv[arg][1] == 'a') {
 114                         get_all = 1;
 115                         get_tree = 1;
 116                         get_history = 1;
 117                 } else if (argv[arg][1] == 'v') {
 118                         get_verbosely = 1;
 119                 } else if (argv[arg][1] == 'w') {
 120                         write_ref = argv[arg + 1];
 121                         arg++;
 122                 } else if (!strcmp(argv[arg], "--recover")) {
 123                         get_recover = 1;
 124                 }
 125                 arg++;
 126         }
 127         if (argc < arg + 2) {
 128                 usage(ssh_fetch_usage);
 129                 return 1;
 130         }
 131         commit_id = argv[arg];
 132         url = argv[arg + 1];
 133
 134         if (setup_connection(&fd_in, &fd_out, prog, url, arg, argv + 1))
 135                 return 1;
 136
 137         if (get_version())
 138                 return 1;
 139
 140         if (pull(commit_id))
 141                 return 1;
 142
 143         return 0;
 144 }