SSH with key from environment variable

ssh_env_key.py

#!/usr/bin/env python
from __future__ import print_function
from __future__ import unicode_literals

import os
import tempfile
import subprocess
import sys

if not 'SSH_KEY' in os.environ:
    cmd = [
        'ssh',
        '-o', 'StrictHostKeyChecking=no',
        ]
    cmd += sys.argv[1:]
    retcode = subprocess.call(cmd)
    sys.exit(retcode)

with tempfile.NamedTemporaryFile() as ssh_key_file:
    ssh_key_file.write(os.environ['SSH_KEY'])
    ssh_key_file.flush()

    cmd = [
        'ssh',
        '-o', 'StrictHostKeyChecking=no',
        '-i', ssh_key_file.name,
        ]
    cmd += sys.argv[1:]

    retcode = subprocess.call(cmd)
    sys.exit(retcode)