script that will identify duplicate all duplicate files in python3

CyberChef answered on March 16, 2023 Popularity 3/10 Helpfulness 2/10

answer script that will identify duplicate all duplicate files in python3

script that will identify duplicate all duplicate files in python3

Comment

# create a script that will identify duplicate files in a directory

# and print out the duplicate files and their paths

#!/usr/bin/env python3
from collections import defaultdict
import hashlib
import os
import sys


def chunk_reader(fobj, chunk_size=1024):
    """Generator that reads a file in chunks of bytes"""
    while True:
        chunk = fobj.read(chunk_size)
        if not chunk:
            return
        yield chunk


def get_hash(filename, first_chunk_only=False, hash=hashlib.sha1):
    hashobj = hash()
    file_object = open(filename, 'rb')

    if first_chunk_only:
        hashobj.update(file_object.read(1024))
    else:
        for chunk in chunk_reader(file_object):
            hashobj.update(chunk)
    hashed = hashobj.digest()

    file_object.close()
    return hashed


def check_for_duplicates(paths, hash=hashlib.sha1):
    hashes_by_size = defaultdict(list)  # dict of size_in_bytes: [full_path_to_file1, full_path_to_file2, ]
    hashes_on_1k = defaultdict(list)  # dict of (hash1k, size_in_bytes): [full_path_to_file1, full_path_to_file2, ]
    hashes_full = {}   # dict of full_file_hash: full_path_to_file_string

    for path in paths:
        for dirpath, dirnames, filenames in os.walk(path):
            # get all files that have the same size - they are the collision candidates
            for filename in filenames:
                full_path = os.path.join(dirpath, filename)
                try:
                    # if the target is a symlink (soft one), this will 
                    # dereference it - change the value to the actual target file
                    full_path = os.path.realpath(full_path)
                    file_size = os.path.getsize(full_path)
                    hashes_by_size[file_size].append(full_path)
                except (OSError,):
                    # not accessible (permissions, etc) - pass on
                    continue


    # For all files with the same file size, get their hash on the 1st 1024 bytes only
    for size_in_bytes, files in hashes_by_size.items():
        if len(files) < 2:
            continue    # this file size is unique, no need to spend CPU cycles on it

        for filename in files:
            try:
                small_hash = get_hash(filename, first_chunk_only=True)
                # the key is the hash on the first 1024 bytes plus the size - to
                # avoid collisions on equal hashes in the first part of the file
                # credits to @Futal for the optimization
                hashes_on_1k[(small_hash, size_in_bytes)].append(filename)
            except (OSError,):
                # the file access might've changed till the exec point got here 
                continue

    # For all files with the hash on the 1st 1024 bytes, get their hash on the full file - collisions will be duplicates
    for __, files_list in hashes_on_1k.items():
        if len(files_list) < 2:
            continue    # this hash of fist 1k file bytes is unique, no need to spend cpy cycles on it

        for filename in files_list:
            try: 
                full_hash = get_hash(filename, first_chunk_only=False)
                duplicate = hashes_full.get(full_hash)
                if duplicate:
                    print("Duplicate found: {} and {}".format(filename, duplicate))
                else:
                    hashes_full[full_hash] = filename
            except (OSError,):
                # the file access might've changed till the exec point got here 
                continue


if __name__ == "__main__":
    if sys.argv[1:]:
        check_for_duplicates(sys.argv[1:])
    else:
        print("Please pass the paths to check as parameters to the script")

Popularity 3/10 Helpfulness 2/10 Language python

Source: stackoverflow.com

Tags: identify python script

Link to this answer
Share Copy Link

Contributed on Mar 16 2023

CyberChef

0 Answers Avg Quality 2/10

script that will identify duplicate all duplicate files in python3

Contents

More Related Answers

script that will identify duplicate all duplicate files in python3

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.