Andrew's git - gitweb.git/blob

   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#include <string.h>
  16
  17static unsigned char local_version = 1;
  18static unsigned char remote_version;
  19
  20static int verbose;
  21
  22static int serve_object(int fd_in, int fd_out) {
  23        ssize_t size;
  24        unsigned char sha1[20];
  25        signed char remote;
  26        int posn = 0;
  27        do {
  28                size = read(fd_in, sha1 + posn, 20 - posn);
  29                if (size < 0) {
  30                        perror("git-ssh-upload: read ");
  31                        return -1;
  32                }
  33                if (!size)
  34                        return -1;
  35                posn += size;
  36        } while (posn < 20);
  37        
  38        if (verbose)
  39                fprintf(stderr, "Serving %s\n", sha1_to_hex(sha1));
  40
  41        remote = 0;
  42        
  43        if (!has_sha1_file(sha1)) {
  44                fprintf(stderr, "git-ssh-upload: could not find %s\n",
  45                        sha1_to_hex(sha1));
  46                remote = -1;
  47        }
  48        
  49        write(fd_out, &remote, 1);
  50        
  51        if (remote < 0)
  52                return 0;
  53        
  54        return write_sha1_to_fd(fd_out, sha1);
  55}
  56
  57static int serve_version(int fd_in, int fd_out)
  58{
  59        if (read(fd_in, &remote_version, 1) < 1)
  60                return -1;
  61        write(fd_out, &local_version, 1);
  62        return 0;
  63}
  64
  65static int serve_ref(int fd_in, int fd_out)
  66{
  67        char ref[PATH_MAX];
  68        unsigned char sha1[20];
  69        int posn = 0;
  70        signed char remote = 0;
  71        do {
  72                if (read(fd_in, ref + posn, 1) < 1)
  73                        return -1;
  74                posn++;
  75        } while (ref[posn - 1]);
  76
  77        if (verbose)
  78                fprintf(stderr, "Serving %s\n", ref);
  79
  80        if (get_ref_sha1(ref, sha1))
  81                remote = -1;
  82        write(fd_out, &remote, 1);
  83        if (remote)
  84                return 0;
  85        write(fd_out, sha1, 20);
  86        return 0;
  87}
  88
  89
  90static void service(int fd_in, int fd_out) {
  91        char type;
  92        int retval;
  93        do {
  94                retval = read(fd_in, &type, 1);
  95                if (retval < 1) {
  96                        if (retval < 0)
  97                                perror("git-ssh-upload: read ");
  98                        return;
  99                }
 100                if (type == 'v' && serve_version(fd_in, fd_out))
 101                        return;
 102                if (type == 'o' && serve_object(fd_in, fd_out))
 103                        return;
 104                if (type == 'r' && serve_ref(fd_in, fd_out))
 105                        return;
 106        } while (1);
 107}
 108
 109static const char ssh_push_usage[] =
 110        MY_PROGRAM_NAME " [-c] [-t] [-a] [-w ref] commit-id url";
 111
 112int main(int argc, char **argv)
 113{
 114        int arg = 1;
 115        char *commit_id;
 116        char *url;
 117        int fd_in, fd_out;
 118        const char *prog;
 119        unsigned char sha1[20];
 120        char hex[41];
 121
 122        prog = getenv(COUNTERPART_ENV_NAME);
 123        if (!prog) prog = COUNTERPART_PROGRAM_NAME;
 124
 125        setup_git_directory();
 126
 127        while (arg < argc && argv[arg][0] == '-') {
 128                if (argv[arg][1] == 'w')
 129                        arg++;
 130                arg++;
 131        }
 132        if (argc < arg + 2)
 133                usage(ssh_push_usage);
 134        commit_id = argv[arg];
 135        url = argv[arg + 1];
 136        if (get_sha1(commit_id, sha1))
 137                die("Not a valid object name %s", commit_id);
 138        memcpy(hex, sha1_to_hex(sha1), sizeof(hex));
 139        argv[arg] = hex;
 140
 141        if (setup_connection(&fd_in, &fd_out, prog, url, arg, argv + 1))
 142                return 1;
 143
 144        service(fd_in, fd_out);
 145        return 0;
 146}