Sign keys from a keysigning party _more_ easily

keysign.py

import sys
import subprocess


def recv_and_sign_key(keyid, email):
    print(keyid, email)
    subprocess.call(['gpg2', '--recv-keys', '0x{}'.format(keyid)])

    subprocess.call(['gpg2', '--fingerprint', email])

    valid = input('Is the above fingerprint correct? ')

    if valid.lower() in ['y', 'yes']:
        subprocess.call(['gpg2', '--ask-cert-level', '--sign-key', email])

        signed_key = subprocess.check_output([
            'gpg2',
            '-a',
            '--export',
            email,
        ], universal_newlines=True)

        with open('{}.{}.signed.asc'.format(email, keyid), 'w+') as key_file:
            key_file.write(signed_key)


if len(sys.argv) == 1:
    print('Usage: keysign.py (batch <key file> | <keyid> <email>)')

elif sys.argv[1] == 'batch':
    if not sys.argv[2]:
        raise Exception('Batch mode require file')

    with open(sys.argv[2], 'r') as f:
        for line in f:
            keyid, email = line.strip().split(' ')
            recv_and_sign_key(keyid, email)
else:
    if not sys.argv[1]:
        raise Exception('Missing keyid')

    if not sys.argv[2]:
        raise Exception('Missing email')

    recv_and_sign_key(sys.argv[1], sys.argv[2])