Run terraform against a set of files

terraform-files

#!/usr/bin/env python3


import argparse
import subprocess


parser = argparse.ArgumentParser()
parser.add_argument('--files', action='append')
file_arguments, other_arguments = parser.parse_known_args()

terraform_filenames = file_arguments.files or []


def get_target_name(line):
    items = line.replace('"', '').split()
    if not items:
        return
    if items[0] == 'resource':
        return f'{items[1]}.{items[2]}'
    elif items[0] == 'module':
        return f'module.{items[1]}'


def get_target_names(terraform_filename):
    with open(terraform_filename) as terraform_file:
        target_lines = (get_target_name(n) for n in terraform_file)
        return [t for t in target_lines if t is not None]


target_names = [t for f in terraform_filenames for t in get_target_names(f)]
target_arguments = [a for t in target_names for a in ('--target', t)]


terraform_command = ['terraform'] + other_arguments + target_arguments

subprocess.run(terraform_command)

Example usage:

terraform-files apply --file my-stuff.tf --file my-other-stuff.tf