Jinja2 template to auto-generate atlantis.yaml for Atlantis / Terraform & pre-commit action & shell script

.pre-commit-config.yaml

repos:
  - repo: https://github.com/lowess/pre-commit-hooks
    rev: v1.2.0 # Get the latest from: https://github.com/lowess/pre-commit-hooks/releases
    hooks:
      - id: jinja2-render-template
        name: Render atlantis.yaml configuration
        args:
          - atlantis.j2
          - --output
          - atlantis.yaml

atlantis.j2

---
{#- 
  Author: Florian Dambrine <@Lowess> 
#}

version: 3

parallel_plan: false
parallel_apply: false
automerge: true

projects:
  # Project Anchor
  - &terragrunt
    name: template
    dir: '.null'
    workflow: terragrunt
    autoplan:
      enabled: true
      when_modified:
        - "./terraform/modules/**/*.tf"
        - "**/*.tf"
        - "**/terragrunt.hcl"

{% set projects = ('find terraform/terragrunt -mindepth 2 \( ! -regex ".*/\..*" \) -type f -name "terragrunt.hcl"' | shell(timeout=20) ).split('\n') -%}

{% for project in projects %}
  {%- set project_name = project.split('/')[2:-1] | join('-') %}
  {%- set project_path = project.split('/')[0:-1] | join('/') %}

  - <<: *terragrunt
    name: {{ project_name }}
    dir: ./{{ project_path }}
    # workspace: {{ project_name }}
{% endfor %}

atlantis.sh

#!/usr/bin/env bash
# Author: Florian Dambrine <@Lowess>

# Make sure to install dependencies first
# Install Python deps: `pip install yasha` or `pip install -r requirements.txt`
# Install JQ: https://stedolan.github.io/jq/download/

PROJECTS=$(find terraform/terragrunt \
  -mindepth 2 \( ! -regex ".*/\..*" \) \
  -type f \
  -name "terragrunt.hcl" \
  | jq -R -s -c 'split("\n") | map(select(length > 0))')

yasha \
  atlantis.j2 \
  -o atlantis.yaml

Makefile

.PHONY: dev atlantis-config
  
dev:
        @echo ⚙️ Setting up pre-commit hooks...
        pre-commit install
        pre-commit install --hook-type commit-msg

atlantis-config:
        @echo 🏝️  Generating atlantis.yaml configuration...
        @./atlantis.sh

requirements.txt

yasha==4.3