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
  39static int prefetches = 0;
  40
  41static struct object_list *in_transit = NULL;
  42static struct object_list **end_of_transit = &in_transit;
  43
  44void prefetch(unsigned char *sha1)
  45{
  46        char type = 'o';
  47        struct object_list *node;
  48        if (prefetches > 100) {
  49                fetch(in_transit->item->sha1);
  50        }
  51        node = xmalloc(sizeof(struct object_list));
  52        node->next = NULL;
  53        node->item = lookup_unknown_object(sha1);
  54        *end_of_transit = node;
  55        end_of_transit = &node->next;
  56        force_write(fd_out, &type, 1);
  57        force_write(fd_out, sha1, 20);
  58        prefetches++;
  59}
  60
  61static char conn_buf[4096];
  62static size_t conn_buf_posn = 0;
  63
  64int fetch(unsigned char *sha1)
  65{
  66        int ret;
  67        signed char remote;
  68        struct object_list *temp;
  69
  70        if (memcmp(sha1, in_transit->item->sha1, 20)) {
  71                // we must have already fetched it to clean the queue
  72                return has_sha1_file(sha1) ? 0 : -1;
  73        }
  74        prefetches--;
  75        temp = in_transit;
  76        in_transit = in_transit->next;
  77        if (!in_transit)
  78                end_of_transit = &in_transit;
  79        free(temp);
  80
  81        if (conn_buf_posn) {
  82                remote = conn_buf[0];
  83                memmove(conn_buf, conn_buf + 1, --conn_buf_posn);
  84        } else {
  85                if (read(fd_in, &remote, 1) < 1)
  86                        return -1;
  87        }
  88        //fprintf(stderr, "Got %d\n", remote);
  89        if (remote < 0)
  90                return remote;
  91        ret = write_sha1_from_fd(sha1, fd_in, conn_buf, 4096, &conn_buf_posn);
  92        if (!ret)
  93                pull_say("got %s\n", sha1_to_hex(sha1));
  94        return ret;
  95}
  96
  97static int get_version(void)
  98{
  99        char type = 'v';
 100        write(fd_out, &type, 1);
 101        write(fd_out, &local_version, 1);
 102        if (read(fd_in, &remote_version, 1) < 1) {
 103                return error("Couldn't read version from remote end");
 104        }
 105        return 0;
 106}
 107
 108int fetch_ref(char *ref, unsigned char *sha1)
 109{
 110        signed char remote;
 111        char type = 'r';
 112        write(fd_out, &type, 1);
 113        write(fd_out, ref, strlen(ref) + 1);
 114        read(fd_in, &remote, 1);
 115        if (remote < 0)
 116                return remote;
 117        read(fd_in, sha1, 20);
 118        return 0;
 119}
 120
 121static const char ssh_fetch_usage[] =
 122  MY_PROGRAM_NAME
 123  " [-c] [-t] [-a] [-v] [-d] [--recover] [-w ref] commit-id url";
 124int main(int argc, char **argv)
 125{
 126        char *commit_id;
 127        char *url;
 128        int arg = 1;
 129        const char *prog;
 130
 131        prog = getenv("GIT_SSH_PUSH");
 132        if (!prog) prog = "git-ssh-upload";
 133
 134        setup_git_directory();
 135
 136        while (arg < argc && argv[arg][0] == '-') {
 137                if (argv[arg][1] == 't') {
 138                        get_tree = 1;
 139                } else if (argv[arg][1] == 'c') {
 140                        get_history = 1;
 141                } else if (argv[arg][1] == 'a') {
 142                        get_all = 1;
 143                        get_tree = 1;
 144                        get_history = 1;
 145                } else if (argv[arg][1] == 'v') {
 146                        get_verbosely = 1;
 147                } else if (argv[arg][1] == 'w') {
 148                        write_ref = argv[arg + 1];
 149                        arg++;
 150                } else if (!strcmp(argv[arg], "--recover")) {
 151                        get_recover = 1;
 152                }
 153                arg++;
 154        }
 155        if (argc < arg + 2) {
 156                usage(ssh_fetch_usage);
 157                return 1;
 158        }
 159        commit_id = argv[arg];
 160        url = argv[arg + 1];
 161
 162        if (setup_connection(&fd_in, &fd_out, prog, url, arg, argv + 1))
 163                return 1;
 164
 165        if (get_version())
 166                return 1;
 167
 168        if (pull(commit_id))
 169                return 1;
 170
 171        return 0;
 172}