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#!/usr/bin/env python

import argparse
import bcrypt
import getpass

bcrypt_rounds=12

def prompt_for_pass():
    password = getpass.getpass("Password: ")

    if not password:
        raise Exception("Password cannot be blank.")

    confirm_password = getpass.getpass("Confirm password: ")

    if password != confirm_password:
        raise Exception("Passwords do not match.")

    return password

if __name__ == "__main__":
    parser = argparse.ArgumentParser(
        description="Calculate the hash of a new password, so that passwords"
                    " can be reset")
    parser.add_argument(
        "-p", "--password",
        default=None,
        help="New password for user. Will prompt if omitted.",
    )

    args = parser.parse_args()
    password = args.password

    if not password:
        password = prompt_for_pass()

    print bcrypt.hashpw(password, bcrypt.gensalt(bcrypt_rounds))