Use jinja2 templates to generate multiple terraform providers in a loop

.gitignore

# Doit database files
.doit.db.*

# Terraform files created from templates
_*.tf

dodo.py

from jinja2 import Environment, FileSystemLoader
from pathlib import Path


DEFAULT_REGION = "us-east-1"
REGIONS = [
    "ap-northeast-1",
    "ap-northeast-2",
    "ap-northeast-3",
    "ap-south-1",
    "ap-southeast-1",
    "ap-southeast-2",
    "ca-central-1",
    "eu-central-1",
    "eu-north-1",
    "eu-west-1",
    "eu-west-2",
    "eu-west-3",
    "sa-east-1",
    "us-east-1",
    "us-east-2",
    "us-west-1",
    "us-west-2",
]


def task_render():
    """ "Render jinja2 templates.

    Yields:
        Render task for each jinja2 template file.

    """
    cwd = Path(".")
    environment = Environment(loader=FileSystemLoader(cwd))
    j2_templates = cwd.glob("*.j2")

    def render_template(template_path):
        """Render template.

        Args:
            template_path: Path to jinja2 template file

        """
        template = environment.get_template(str(template_path))
        with open(f"_{template_path.stem}", "w") as output_file:
            output_file.write(template.render(default_region=DEFAULT_REGION, regions=REGIONS))

    for j2_template in j2_templates:
        target = f"_{j2_template.stem}"
        yield {
            "name": target,
            "actions": [
                (
                    render_template,
                    [j2_template],
                    {},
                ),
            ],
            "file_dep": [j2_template],
            "targets": [target],
            "clean": True,
        }

provider.tf.j2

{% for region in regions %}
provider "aws" {
{%- if region != default_region %}
  alias = "{{ region | replace("-", "_") }}"
{%- endif %}
  default_tags {
    tags = local.tags
  }
  region = "{{ region }}"
}
{% endfor %}

Thanks. Will try it out