read-tree.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7
   8 static int unpack(unsigned char *sha1)
   9 {
  10         void *buffer;
  11         unsigned long size;
  12         char type[20];
  13
  14         buffer = read_sha1_file(sha1, type, &size);
  15         if (!buffer)
  16                 usage("unable to read sha1 file");
  17         if (strcmp(type, "tree"))
  18                 usage("expected a 'tree' node");
  19         while (size) {
  20                 int len = strlen(buffer)+1;
  21                 unsigned char *sha1 = buffer + len;
  22                 char *path = strchr(buffer, ' ')+1;
  23                 unsigned int mode;
  24                 if (size < len + 20 || sscanf(buffer, "%o", &mode) != 1)
  25                         usage("corrupt 'tree' file");
  26                 buffer = sha1 + 20;
  27                 size -= len + 20;
  28                 printf("%o %s (%s)\n", mode, path, sha1_to_hex(sha1));
  29         }
  30         return 0;
  31 }
  32
  33 int main(int argc, char **argv)
  34 {
  35         int fd;
  36         unsigned char sha1[20];
  37
  38         if (argc != 2)
  39                 usage("read-tree <key>");
  40         if (get_sha1_hex(argv[1], sha1) < 0)
  41                 usage("read-tree <key>");
  42         sha1_file_directory = getenv(DB_ENVIRONMENT);
  43         if (!sha1_file_directory)
  44                 sha1_file_directory = DEFAULT_DB_ENVIRONMENT;
  45         if (unpack(sha1) < 0)
  46                 usage("unpack failed");
  47         return 0;
  48 }