# A workflow to run against renovate-bot's PRs,
# such as `make package` after it updates the package.json and package-lock.json files.

# The potentially untrusted code is first run inside a low-privilege Job, and the diff is uploaded as an artifact.
# Then a higher-privilege Job applies the diff and pushes the changes to the PR.
# It's important to only run this workflow against PRs from trusted sources, after also reviewing the changes!

# There have been vulnerabilities with using `git apply` https://github.blog/2023-04-25-git-security-vulnerabilities-announced-4/
# At this point a compromised git binary cannot modify any of this repo's branches, only the PR fork's branch,
# due to our branch protection rules and CODEOWNERS.
# It aslso cannot submit a new release or modify exsiting releases due to tag protection rules.

name: Update actions dist post-commit

permissions: {}

on:
    workflow_dispatch:
        inputs:
            pr_number:
                description: "The pull request number."
                required: true
                type: number

jobs:
    diff:
        permissions:
            # This Job executes the PR's untrusted code, so it must how low permissions.
            pull-requests: read
        outputs:
            patch_not_empty: ${{ steps.diff.outputs.patch_not_empty }}
        runs-on: ubuntu-latest
        steps:
            - name: checkout
              uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
              with:
                  repository: ${{ github.repository }}
                  persist-credentials: false
            - name: checkout-pr
              env:
                  GH_TOKEN: ${{ github.token }}
                  PR_NUMBER: ${{ inputs.pr_number }}
              run: gh pr checkout "$PR_NUMBER"
            - name: run-command
              run: |
                (
                    cd ./actions/installer/dist/../ && \
                    make clean && \
                    make package
                )
            - name: diff
              id: diff
              run: |
                  git add .
                  git status
                  git diff HEAD > changes.patch
                  [ -z "$(cat changes.patch)" ] && RESULT=false || RESULT=true
                  echo "patch_not_empty=$RESULT" >> "$GITHUB_OUTPUT"
            - name: upload
              uses: actions/upload-artifact@5d5d22a31266ced268874388b861e4b58bb5c2f3 # v4.3.1
              with:
                  name: changes.patch
                  path: changes.patch

    push:
        if: needs.diff.outputs.patch_not_empty == 'true'
        needs: diff
        runs-on: ubuntu-latest
        permissions:
            # This Job does not run untrusted code, but it does need to push changes to the PR's branch.
            pull-requests: read
            contents: write
        steps:
            - name: checkout
              uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
            - name: checkout-pr
              env:
                  GH_TOKEN: ${{ github.token }}
                  PR_NUMBER: ${{ inputs.pr_number }}
              run: gh pr checkout "$PR_NUMBER"
            - name: download-patch
              uses: actions/download-artifact@c850b930e6ba138125429b7e5c93fc707a7f8427 # v4.1.4
              with:
                  name: changes.patch
            - id: apply
              run: |
                  git apply changes.patch
                  rm changes.patch
            # example from
            # https://github.com/actions/checkout/blob/cd7d8d697e10461458bc61a30d094dc601a8b017/README.md#push-a-commit-using-the-built-in-token
            - name: push
              run: |
                  git config user.name github-actions
                  git config user.email github-actions@github.com
                  git add .
                  git status
                  git commit -s -m "update actions dist"
                  git push