code.delx.au - monosys/blob - apple-time-machine-symlink.py

   1 #!/usr/bin/env python2
   2
   3 # This tool tries to parse the weird hardlink format Apple uses for Time Machine
   4 # The goal is to recover data from a Time Machine backup without a Mac
   5
   6 import math
   7 import stat
   8 import os
   9 import sys
  10
  11 def find_lookup_dir(path):
  12     while path != "/":
  13         lookup_dir = os.path.join(path, ".HFS+ Private Directory Data\r")
  14         if os.path.isdir(lookup_dir):
  15             return lookup_dir
  16         path = os.path.split(path)[0]
  17     raise Exception("Could not find HFS+ link dir")
  18
  19 def resolve_path(lookup_dir, path):
  20     st = os.lstat(path)
  21     if stat.S_ISREG(st.st_mode) and st.st_size == 0 and st.st_nlink > 1000:
  22         return os.path.join(lookup_dir, "dir_%d" % st.st_nlink)
  23     else:
  24         return path
  25
  26
  27 def process_directory(lookup_dir, dest, path):
  28     if os.path.islink(dest):
  29         os.unlink(dest)
  30     if not os.path.isdir(dest):
  31         os.mkdir(dest)
  32     path = resolve_path(lookup_dir, path)
  33
  34     for filename in os.listdir(path):
  35         full_filename = os.path.join(path, filename)
  36         full_filename = resolve_path(lookup_dir, full_filename)
  37         dest_filename = os.path.join(dest, filename)
  38
  39         if os.path.isdir(full_filename):
  40             process_directory(lookup_dir, dest_filename, full_filename)
  41         else:
  42             if os.path.islink(dest_filename):
  43                 os.unlink(dest_filename)
  44             if not os.path.isdir(dest_filename):
  45                 os.symlink(full_filename, dest_filename)
  46
  47 def main(dest, path):
  48     lookup_dir = find_lookup_dir(path)
  49     process_directory(lookup_dir, dest, path)
  50
  51 def print_usage_exit():
  52     print >>sys.stderr, "Usage: %s dest path" % sys.argv[0]
  53     sys.exit(1)
  54
  55 if __name__ == "__main__":
  56     if len(sys.argv) != 3:
  57         print_usage_exit()
  58
  59     dest = sys.argv[1]
  60     path = sys.argv[2]
  61
  62     main(dest, path)
  63