cat-file.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7
   8 int main(int argc, char **argv)
   9 {
  10         unsigned char sha1[20];
  11         char type[20];
  12         void *buf;
  13         unsigned long size;
  14         int opt;
  15
  16         setup_git_directory();
  17         if (argc != 3 || get_sha1(argv[2], sha1))
  18                 usage("git-cat-file [-t|-s|-e|<type>] <sha1>");
  19
  20         opt = 0;
  21         if ( argv[1][0] == '-' ) {
  22                 opt = argv[1][1];
  23                 if ( !opt || argv[1][2] )
  24                         opt = -1; /* Not a single character option */
  25         }
  26
  27         buf = NULL;
  28         switch (opt) {
  29         case 't':
  30                 if (!sha1_object_info(sha1, type, NULL)) {
  31                         printf("%s\n", type);
  32                         return 0;
  33                 }
  34                 break;
  35
  36         case 's':
  37                 if (!sha1_object_info(sha1, type, &size)) {
  38                         printf("%lu\n", size);
  39                         return 0;
  40                 }
  41                 break;
  42
  43         case 'e':
  44                 return !has_sha1_file(sha1);
  45
  46         case 0:
  47                 buf = read_object_with_reference(sha1, argv[1], &size, NULL);
  48                 break;
  49
  50         default:
  51                 die("git-cat-file: unknown option: %s\n", argv[1]);
  52         }
  53
  54         if (!buf)
  55                 die("git-cat-file %s: bad file", argv[2]);
  56
  57         while (size > 0) {
  58                 long ret = write(1, buf, size);
  59                 if (ret < 0) {
  60                         if (errno == EAGAIN)
  61                                 continue;
  62                         /* Ignore epipe */
  63                         if (errno == EPIPE)
  64                                 break;
  65                         die("git-cat-file: %s", strerror(errno));
  66                 } else if (!ret) {
  67                         die("git-cat-file: disk full?");
  68                 }
  69                 size -= ret;
  70                 buf += ret;
  71         }
  72         return 0;
  73 }