ssh-upload.c

   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
  17 static unsigned char local_version = 1;
  18 static unsigned char remote_version = 0;
  19
  20 static int verbose = 0;
  21
  22 static 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
  57 static 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
  65 static 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
  90 static 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
 109 static const char ssh_push_usage[] =
 110         MY_PROGRAM_NAME " [-c] [-t] [-a] [-w ref] commit-id url";
 111
 112 int 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         while (arg < argc && argv[arg][0] == '-') {
 125                 if (argv[arg][1] == 'w')
 126                         arg++;
 127                 arg++;
 128         }
 129         if (argc < arg + 2)
 130                 usage(ssh_push_usage);
 131         commit_id = argv[arg];
 132         url = argv[arg + 1];
 133         if (get_sha1(commit_id, sha1))
 134                 usage(ssh_push_usage);
 135         memcpy(hex, sha1_to_hex(sha1), sizeof(hex));
 136         argv[arg] = hex;
 137
 138         if (setup_connection(&fd_in, &fd_out, prog, url, arg, argv + 1))
 139                 return 1;
 140
 141         service(fd_in, fd_out);
 142         return 0;
 143 }