Simple script to compare MD5s between two dirs and all subdirs to be there all the same files exists (ignores filenames and dir structure)

missing_files.py

import argparse
import os
import hashlib

# Origin_dir_files = Build an MD5 hash of files with filenames in original dir (with subdirs)
# Destination_dir_files = Do the same for all in the destination dir
# Iterate over origin_dir_files to see each hash exists in Destination_dir_files. Print any that aren't


def get_all_filenames(root):
    all_file_names = []
    for path, subdirs, files in os.walk(root):
        for name in files:
            all_file_names.append((os.path.join(path, name)))
    return all_file_names

def md5(fname):
    hash_md5 = hashlib.md5()
    with open(fname, "rb") as f:
        for chunk in iter(lambda: f.read(4096), b""):
            hash_md5.update(chunk)
    return hash_md5.hexdigest()


# Main

parser = argparse.ArgumentParser(description='Compare the MD5s of all files and subdirectories')
parser.add_argument('origin_dir', help='original directory with correct data',action='store')
parser.add_argument('dest_dir', help='destination directory with same desired data',action='store')

args = parser.parse_args()

origin_file_names= get_all_filenames(args.origin_dir)
dest_file_names = get_all_filenames(args.dest_dir)

origin_md5s = {}
dest_md5s = {}

for file_name in origin_file_names:
    origin_md5s[md5(file_name)] = file_name

for file_name in dest_file_names:
    dest_md5s[md5(file_name)] = file_name

for o_md5 in origin_md5s:
    try:
        dest_md5s[o_md5]
    except:
        print "Not in destination anywhere: " + origin_md5s[o_md5]