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terraform-plan-comment

GitHub Action to post the output of terraform plan to a pull request comment.

Features

  • Generate a structured, "markdown-native" representation of the plan
    • Obtain a high-level overview via foldable sections
    • Do not lose any information compared to the output of terraform plan
  • Post the plan to pull requests as a "sticky comment"
  • Run as a "native" JavaScript action rather than launching a Docker container
  • Use with or without the Terraform wrapper script provided by hashicorp/setup-terraform

Usage

- name: Setup terraform
  uses: hashicorp/setup-terraform@v3
- name: Initialize
  run: terraform init
- name: Plan
  run: terraform plan -out .planfile
- name: Post PR comment
  uses: borchero/terraform-plan-comment@v2
  with:
    token: ${{ github.token }}
    planfile: .planfile

Example Comments

Collapsed Screenshot 2024-04-30 at 00 07 36
Expanded Screenshot 2024-04-30 at 00 08 22

Parameters

This action provides a few input parameters that allow for customization:

token (required)

Required input parameter to access the GitHub API for posting a pull request comment. Can be provided as ${{ github.token }}, ${{ env.GITHUB_TOKEN }} or some personal access token with appropriate permissions.

If using the workflow-provided token, make sure that your workflow/job has write-permissions to pull requests.

planfile (required)

The path to the planfile generated by terraform plan which holds the information about which changes ought to be applied.

terraform-cmd

The command to execute to call the Terraform binary. Defaults to terraform. You likely don't need to augment this unless terraform cannot be found in the PATH.

working-directory

The directory where the Terraform binary ought to be called. Defaults to $GITHUB_WORKSPACE and must be specified if terraform init has been run in a different directory. Should be specified relative to $GITHUB_WORKSPACE.

Important

planfile must be specified relative to the working directory.

header

The header that is used for the pull request comment posted by this action. Changing the default allows to distinguish multiple Terraform runs: each sticky pull request comment is identified by its header.