Encode a bash file into base64 cloudinit user data.

encode_user_data.py

#!./env/bin/python
import base64
import sys

def encode_user_data(lines):
    """
    Input is an array of lines that together make a script.
    Output is a base64 encoded block suitable for the userdata parameter
    of an instance config.
    """
    cloud_config = "#cloud-config\nruncmd:\n" + ''.join([f" - {line}" for line in lines])
    return base64.b64encode(cloud_config.encode("utf-8")).decode('ascii')

if __name__ == "__main__":
    print(encode_user_data(sys.stdin.readlines()))