The Repasar GitHub Action (GHA) checks the current SHA that triggered the GHA and check to make sure that it is signed properly using subcommands supported by Git.

Copy the text below into a file in your repository called .github/workflows/verified_commits_check.yml then just commit and push it to your default branch.

# .github/workflows/verify-commits.yml
name: Verifying the latest commit
run-name: ${{ github.actor }} is verifying the validity of current commit
on: [push]
jobs:
  check-sha:
    runs-on: ubuntu-latest
    name: Check the SHA of the latest commit
    steps:
      - name: Checkout the code
        uses: actions/checkout@v3
      - name: Run repasar on the latest SHA
        uses: rogeruiz/[email protected]
        with:
          allowed-signers-file-path: ./.github/allowed_signers
          fail-on-unverified: true

The only required input is the allowed-signers-file-path which is recommended to be resolved to ./.github/allowed_signers. This file contains the public SSH keys in the following format per-line.

<email>[,<email>...] <key type> <public key>

These public keys are safe to check into your repository. To generate this file based on the public keys available on GitHub for committers to the repository, you can generate them using the allowedSignersFile project by @frankywahl. This file can also be maintained manually and checked in by each individual committer for your projects.

=> frankywahl/allowedSignersFile project

By default, this Action does not fail the run if the verification of the commit is unsuccessful. If you would like to have the Action fail, then set the fail-on-unverified to true in the workflows/ YAML file.

This action uses the ${GITHUB_SHA} variable to pull the current commit.