Automating Terraform Documentation with Terraform-Docs and Azure DevOps

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  • Let's take a closer look at the following Multi-Stage pipeline for windows. (for linux based build agents see this Multi-Stage pipeline for linux instead).

  • terraform-docs

    Generate documentation from Terraform modules in various output formats

  • ### Muti-Stage pipeline for windows trigger: - main variables: terraformDocsVersion: '0.16.0' serviceConnectionName: 'Terraform-SPN-DevOps-MagiconionM' keyvaultName: 'pwd9000-core-kv' pool: vmImage: 'windows-latest' stages: - stage: GenerateTerraformDocumentation jobs: - job: Generate_Terraform_Documentation steps: - checkout: self persistCredentials: true # this allows the later scripts to use the system-provided git token to push changes back to the repo ### Link to key vault. - task: AzureKeyVault@1 inputs: azureSubscription: $(serviceConnectionName) #ADO service connection (Service principal) KeyVaultName: $(keyvaultName) SecretsFilter: 'TerraformDocsPAToken' RunAsPreJob: true displayName: Get PAToken from Keyvault ### Install Terraform-Docs. - powershell: | Invoke-WebRequest -Uri "https://github.com/terraform-docs/terraform-docs/releases/download/v$(terraformDocsVersion)/terraform-docs-v$(terraformDocsVersion)-windows-amd64.zip" -OutFile "terraform-docs.zip" Expand-Archive -Path "terraform-docs.zip" -DestinationPath "$(System.DefaultWorkingDirectory)\terraform-docs" -Force $env:Path += ";$(System.DefaultWorkingDirectory)\terraform-docs" displayName: 'Install terraform-docs' ### Remove all old README.md files and generate new README.md files for each TF module. - powershell: | # Set Modules Root Directory Set-Location "$(Build.SourcesDirectory)\@TF_Modules" # Get all subdirectories (Terraform module directories) $terraformModuleDirs = Get-ChildItem -Path (Get-Location) -Directory # Loop through each directory to cleanup/remove old README files foreach ($dir in $terraformModuleDirs) { # Get all files in the directory $readMeFiles = Get-ChildItem -Path $dir.FullName -Filter 'README.md' # Loop through each file in each terraform module foreach ($file in $readMeFiles) { # Check if README file already exists and remove if ($file) { # Remove the file Remove-Item $file.FullName -Confirm:$false Write-Output "Old file '$($file.Name)' removed from '$($dir.FullName)'" } } #After cleanup create a new README.md file with 'terraform-docs' based on latest TF module code in current folder(terraform module) $tfFiles = Get-ChildItem -Path $dir.FullName -Filter *.tf if ($tfFiles.Count -gt 0) { # Create new README.md file $(System.DefaultWorkingDirectory)\terraform-docs\terraform-docs.exe markdown table $dir.FullName --output-file "README.md" } else { Write-Output "No .tf files found." } } displayName: 'Cleanup and Generate new README for each TF module' ### Commit and push updated README.md files for TF modules. - powershell: | git config --local user.email "terraform-docs@myOrg.com" git config --local user.name "Terraform Docs" git add *.md git commit -m "Update README.md for each TF module" git push origin HEAD:$(Build.SourceBranchName) displayName: 'Commit and Push updated README.md files for TF modules' env: SYSTEM_ACCESSTOKEN: $(TerraformDocsPAToken)

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