[hash directory and capture filename data]

hash_dir.py

import os
import hashlib


def hash_dir(path):
    """
    Create a hash out of a directory that handles renamed files.

    A hash of the contents of a file will not capture a hash of the filename.
    This function will add filenames to the hash so that we can know if a
    filename has changed as well as the file contents.
    """
    # Create a hash out of a directory that will also handle
    # renamed files.
    path = os.path.abspath(path)
    sha1_hash = hashlib.sha1()
    filepaths = []
    for root, dirs, files in os.walk(path):
        for name in files:
            filepath = os.path.join(root, name)
            filepaths.append(filepath)

            # update our hash with data from this file
            with open(filepath, "rb") as f:
                while True:
                    content = f.read(4096)
                    if not content:
                        break
                    sha1_hash.update(content)

    # Handle file renaming which doesn't change file contents
    # by updating our hash with the names of all the files
    filepaths.sort()
    for filepath in filepaths:
        sha1_hash.update(filepath)

    return sha1_hash.hexdigest()