Andrew's git - gitweb.git/blob

   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
  17static int fd_in;
  18static int fd_out;
  19
  20static unsigned char remote_version = 0;
  21static unsigned char local_version = 1;
  22
  23static 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
  39void 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
  47static char conn_buf[4096];
  48static size_t conn_buf_posn = 0;
  49
  50int 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
  71static 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
  82int 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
  95static const char ssh_fetch_usage[] =
  96  MY_PROGRAM_NAME
  97  " [-c] [-t] [-a] [-v] [-d] [--recover] [-w ref] commit-id url";
  98int 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                }
 123                arg++;
 124        }
 125        if (argc < arg + 2) {
 126                usage(ssh_fetch_usage);
 127                return 1;
 128        }
 129        commit_id = argv[arg];
 130        url = argv[arg + 1];
 131
 132        if (setup_connection(&fd_in, &fd_out, prog, url, arg, argv + 1))
 133                return 1;
 134
 135        if (get_version())
 136                return 1;
 137
 138        if (pull(commit_id))
 139                return 1;
 140
 141        return 0;
 142}