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feat: add pre-commit workflow for automated code quality (#203)
* feat: add pre-commit workflow for code quality automation Add comprehensive pre-commit GitHub Actions workflow including: - Terraform formatting and validation - Documentation generation with terraform-docs - TFLint analysis for best practices - File formatting and consistency checks - Optimized caching and parallel execution * docs: add pre-commit workflow documentation to CLAUDE.md Add comprehensive documentation for the new pre-commit GitHub Actions workflow including: - Automated code quality checks and formatting - Tool installation and caching configuration - Local setup instructions for pre-commit hooks - CI/CD integration details and workflow triggers
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‎.github/workflows/pre-commit.yml‎

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name: Pre-commit
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on:
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pull_request:
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branches: [master]
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paths:
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- '**.tf'
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- '**.tfvars'
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- '**.md'
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- '.pre-commit-config.yaml'
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push:
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branches: [master]
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paths:
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- '**.tf'
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- '**.tfvars'
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- '**.md'
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- '.pre-commit-config.yaml'
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jobs:
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pre-commit:
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runs-on: ubuntu-latest
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timeout-minutes: 15
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permissions:
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contents: read
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pull-requests: read
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steps:
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- name: Checkout repository
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uses: actions/checkout@v4
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with:
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fetch-depth: 0
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- name: Set up Python
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uses: actions/setup-python@v4
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with:
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python-version: '3.11'
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- name: Set up Terraform
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uses: hashicorp/setup-terraform@v3
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with:
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terraform_version: '1.3.0'
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- name: Cache terraform tools
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uses: actions/cache@v3
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with:
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path: |
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~/.local/bin/terraform-docs
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~/.local/bin/tflint
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key: terraform-tools-${{ runner.os }}-v1
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restore-keys: |
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terraform-tools-${{ runner.os }}-
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- name: Install terraform-docs
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run: |
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if [ ! -f ~/.local/bin/terraform-docs ]; then
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echo "Installing terraform-docs..."
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mkdir -p ~/.local/bin
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curl -sSLo ./terraform-docs.tar.gz https://terraform-docs.io/dl/v0.16.0/terraform-docs-v0.16.0-$(uname)-amd64.tar.gz
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tar -xzf terraform-docs.tar.gz
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chmod +x terraform-docs
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mv terraform-docs ~/.local/bin/
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rm terraform-docs.tar.gz
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fi
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echo "$HOME/.local/bin" >> $GITHUB_PATH
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- name: Install tflint
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run: |
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if ! command -v tflint &> /dev/null; then
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echo "Installing tflint..."
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curl -s https://raw.githubusercontent.com/terraform-linters/tflint/master/install_linux.sh | bash
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fi
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- name: Install pre-commit
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run: |
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python -m pip install --upgrade pip
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pip install pre-commit
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- name: Cache pre-commit hooks
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uses: actions/cache@v3
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with:
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path: ~/.cache/pre-commit
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key: pre-commit-${{ runner.os }}-${{ hashFiles('.pre-commit-config.yaml') }}
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restore-keys: |
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pre-commit-${{ runner.os }}-
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- name: Install pre-commit hooks
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run: pre-commit install-hooks
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- name: Run pre-commit on all files (push to master)
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if: github.event_name == 'push' && github.ref == 'refs/heads/master'
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run: pre-commit run --all-files
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- name: Run pre-commit on changed files (pull request)
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if: github.event_name == 'pull_request'
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run: |
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# Get the list of changed files
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git fetch origin ${{ github.base_ref }}
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CHANGED_FILES=$(git diff --name-only origin/${{ github.base_ref }}...HEAD -- '*.tf' '*.tfvars' '*.md')
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if [ -n "$CHANGED_FILES" ]; then
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echo "Running pre-commit on changed files:"
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echo "$CHANGED_FILES"
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pre-commit run --files $CHANGED_FILES
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else
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echo "No relevant files changed, skipping pre-commit checks"
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fi
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- name: Pre-commit summary
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if: always()
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run: |
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echo "## 🔍 Pre-commit Results" >> $GITHUB_STEP_SUMMARY
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echo "" >> $GITHUB_STEP_SUMMARY
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if [ "${{ job.status }}" == "success" ]; then
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echo "✅ All pre-commit checks passed!" >> $GITHUB_STEP_SUMMARY
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echo "" >> $GITHUB_STEP_SUMMARY
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echo "**Tools verified:**" >> $GITHUB_STEP_SUMMARY
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echo "- 🔧 Terraform formatting" >> $GITHUB_STEP_SUMMARY
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echo "- ✅ Terraform validation" >> $GITHUB_STEP_SUMMARY
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echo "- 📚 Documentation generation" >> $GITHUB_STEP_SUMMARY
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echo "- 🔍 TFLint analysis" >> $GITHUB_STEP_SUMMARY
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echo "- 🧹 File formatting" >> $GITHUB_STEP_SUMMARY
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else
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echo "❌ Pre-commit checks failed" >> $GITHUB_STEP_SUMMARY
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echo "" >> $GITHUB_STEP_SUMMARY
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echo "Please check the logs above for specific failures." >> $GITHUB_STEP_SUMMARY
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echo "You can run \`pre-commit run --all-files\` locally to fix issues." >> $GITHUB_STEP_SUMMARY
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fi
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echo "" >> $GITHUB_STEP_SUMMARY
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echo "**Configured hooks:**" >> $GITHUB_STEP_SUMMARY
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echo "- trailing-whitespace" >> $GITHUB_STEP_SUMMARY
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echo "- end-of-file-fixer" >> $GITHUB_STEP_SUMMARY
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echo "- check-yaml" >> $GITHUB_STEP_SUMMARY
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echo "- terraform_fmt" >> $GITHUB_STEP_SUMMARY
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echo "- terraform_validate" >> $GITHUB_STEP_SUMMARY
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echo "- terraform_docs" >> $GITHUB_STEP_SUMMARY
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echo "- terraform_tflint" >> $GITHUB_STEP_SUMMARY

‎CLAUDE.md‎

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- Test audit framework compliance
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- Validate organization policy enforcement
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## Pre-commit Configuration & Automation
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### Automated Code Quality with GitHub Actions
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This module includes a comprehensive pre-commit GitHub Actions workflow (`.github/workflows/pre-commit.yml`) that automatically validates code quality and formatting. The workflow runs on:
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- **Pull requests** targeting the master branch with changes to `.tf`, `.tfvars`, `.md`, or `.pre-commit-config.yaml` files
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- **Pushes** to the master branch with changes to the same file types
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#### Pre-commit Workflow Features
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**Automated Tools & Checks:**
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- 🔧 **Terraform formatting** (`terraform fmt`)
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- ✅ **Terraform validation** (`terraform validate`)
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- 📚 **Documentation generation** (`terraform-docs`)
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- 🔍 **TFLint analysis** for best practices and errors
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- 🧹 **File formatting** (trailing whitespace, end-of-file fixes)
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- 📋 **YAML validation** for configuration files
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**Performance Optimizations:**
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- **Smart caching** of terraform-docs and tflint binaries
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- **Pre-commit hook caching** for faster subsequent runs
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- **Incremental checking** on pull requests (only changed files)
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- **Full validation** on master branch pushes
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- **15-minute timeout** to prevent hung jobs
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**Workflow Intelligence:**
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- **Changed file detection** - Only runs pre-commit on relevant changed files in PRs
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- **Comprehensive summary** - Provides detailed results in GitHub Actions summary
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- **Tool installation verification** - Automatically installs and caches required tools
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- **Cross-platform compatibility** - Optimized for Ubuntu runners
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#### Local Pre-commit Setup
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**Install pre-commit locally for development:**
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```bash
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# Install pre-commit (requires Python)
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pip install pre-commit
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# Install pre-commit hooks for this repository
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pre-commit install
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# Run pre-commit on all files manually
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pre-commit run --all-files
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# Run pre-commit on specific files
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pre-commit run --files main.tf variables.tf
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```
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**Required Tools for Local Development:**
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```bash
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# Terraform (version 1.3.0+ recommended)
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terraform --version
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# terraform-docs for README generation
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curl -sSLo ./terraform-docs.tar.gz https://terraform-docs.io/dl/v0.16.0/terraform-docs-v0.16.0-$(uname)-amd64.tar.gz
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tar -xzf terraform-docs.tar.gz
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sudo mv terraform-docs /usr/local/bin/
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# TFLint for Terraform linting
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curl -s https://raw.githubusercontent.com/terraform-linters/tflint/master/install_linux.sh | bash
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```
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#### Pre-commit Configuration
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The module uses `.pre-commit-config.yaml` with the following hooks:
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**Basic File Quality:**
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- `trailing-whitespace` - Remove trailing whitespace
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- `end-of-file-fixer` - Ensure files end with newline
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- `check-yaml` - Validate YAML syntax
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**Terraform Quality:**
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- `terraform_fmt` - Format Terraform files
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- `terraform_validate` - Validate Terraform syntax and logic
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- `terraform_docs` - Generate documentation
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- `terraform_tflint` - Advanced Terraform linting
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#### CI/CD Integration Benefits
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**Pull Request Automation:**
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- **Instant feedback** on code quality issues
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- **Prevents merge** of poorly formatted code
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- **Reduces review time** by catching common issues
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- **Maintains consistency** across contributors
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**Master Branch Protection:**
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- **Comprehensive validation** on all files after merge
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- **Documentation updates** automatically generated
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- **Quality gate** for production code
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**Development Experience:**
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- **Fast feedback loop** with incremental checking
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- **Clear error messages** with actionable guidance
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- **Automated fixes** for many formatting issues
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- **Consistent development environment** across team
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### Pre-commit Best Practices
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#### Local Development Workflow
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```bash
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# Before committing changes
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git add .
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pre-commit run --files $(git diff --cached --name-only)
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# If pre-commit fixes issues, add them and commit
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git add .
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git commit -m "feat: add backup vault lock configuration"
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```
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#### Troubleshooting Pre-commit Issues
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**Common Issues & Solutions:**
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**Terraform Formatting Errors:**
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```bash
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# Fix formatting automatically
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terraform fmt -recursive .
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# Check specific file
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terraform fmt -check main.tf
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```
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**Documentation Generation Errors:**
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```bash
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# Regenerate documentation
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terraform-docs markdown table . > README.md
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# Check terraform-docs configuration
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terraform-docs --version
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```
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**TFLint Errors:**
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```bash
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# Run TFLint locally to see detailed errors
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tflint
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# Initialize TFLint if needed
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tflint --init
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```
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**Pre-commit Hook Installation Issues:**
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```bash
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# Reinstall pre-commit hooks
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pre-commit uninstall
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pre-commit install
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# Clear pre-commit cache if needed
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pre-commit clean
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```
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#### Performance Considerations
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**Large Repositories:**
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- Pre-commit runs only on changed files in PRs (faster feedback)
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- Tool binaries are cached between runs
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- Pre-commit hooks are cached based on configuration hash
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**Network Issues:**
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- Tools are installed once and cached
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- Fallback installation methods for corporate networks
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- Offline capability after initial tool installation
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## Security Considerations
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### AWS Backup-Specific Security Practices

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