simple python string.Template example

commands.template

aws ecr get-login-password --region ${aws_region} | docker login --username AWS --password-stdin ${aws_account_id}.dkr.ecr.$aws_region.amazonaws.com
docker build -t ${image_name} .
docker tag ${image_name}:$image_tag ${aws_account_id}.dkr.ecr.$aws_region.amazonaws.com/${image_name}:$image_tag
docker push ${aws_account_id}.dkr.ecr.${aws_region}.amazonaws.com/${image_name}:$image_tag

main.py

import argparse
import pathlib
from string import Template


here = pathlib.Path(__file__).parent


def main():
    parser = argparse.ArgumentParser(description='generate docker build & push commands')
    parser.add_argument('--account', type=str, required=True, dest='aws_account_id', help='aws account id')
    parser.add_argument('--region', type=str, required=True, dest='aws_region', help='aws region')
    parser.add_argument('-i', '--image-name', type=str, required=True, dest='image_name', help='image name')
    parser.add_argument('-t', '--image-tag', type=str, required=True, dest='image_tag', help='image name')
    args = parser.parse_args()

    template_path = here / 'commands.template'
    with template_path.open() as f:
        t = Template(f.read())

    commands = t.substitute(
        aws_account_id=args.aws_account_id,
        aws_region=args.aws_region,
        image_name=args.image_name,
        image_tag=args.image_tag
    )

    print(commands)


if __name__ == "__main__":
    main()

Example usage

$ python -m main --account 1234567879012 --region ap-northeast-1 --image-name foo-image --image-tag v0.1.0