Find all files with a resource fork that begin with the magic number 'DDA2'; these are DiskDoubler archives

find-diskdoubler-archives.py

#!/usr/bin/env python

import os
import subprocess

DIRS_TO_SKIP = ['.fseventsd', '.Spotlight-V100']

for (dirpath, dirnames, filenames) in os.walk(os.getcwd()):
    should_skip = False

    for dir_to_skip in DIRS_TO_SKIP:
        if dir_to_skip in dirpath:
            should_skip = True
            break

    if should_skip:
        continue

    file_paths = (os.path.join(dirpath, filename) for filename in filenames)

    for file_path in file_paths:
        try:
            xattrs = filter(lambda x: len(x) > 0, subprocess.check_output(
                ['/usr/bin/xattr', file_path]).strip().split('\n'))

            if 'com.apple.ResourceFork' in xattrs:
                with open(file_path, 'rb') as fp:
                    if str(fp.read(4)) == 'DDA2':
                        print file_path
        except subprocess.CalledProcessError:
            continue