#!/usr/bin/python3
"""Write an ISO image to a usb drive using dd."""

import argparse
import pathlib
import subprocess

if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument("-b", "--bs",
                        default=512,
                        help="block size",
                        metavar="bs")
    parser.add_argument("input_file", help="input file to write")
    parser.add_argument("output_file", help="output block device")
    args = parser.parse_args()

    block_size = args.bs
    input_file = args.input_file
    block_device = args.output_file

    if not pathlib.Path(block_device).is_block_device():
        print(f"Error: {block_device} is not a block device")
        exit(1)

    print(f"Input file: {input_file}")
    print(f"Block device: {block_device}")
    print(f"Block size: {block_size}")

    try:
        subprocess.run(["dd", f"if={input_file}",
                        f"of={block_device}",
                        f"bs={block_size}",
                        "status=progress"], check=True)
    except subprocess.CalledProcessError:
        exit(1)
    else:
        subprocess.run(['sync'])