auto_bump_golang.yml

name: Auto Update Go Patch
on:
  schedule:
    - cron: '0 0 * * *' # Runs every day at midnight UTC
  workflow_dispatch: # Allows manual triggering of the workflow
  pull_request:
    paths: # only run on pull requests that modify this workflow
    - '.github/workflows/auto_bump_golang.yml'
permissions: 
  pull-requests: write
  contents: write
  actions: write # needed if branch 'actions/update-go-mod-patch' is not pre-created and action is pushing .github/workflows/... to the repo
env:
  GH_TOKEN: ${{ github.token }}
jobs:
  bump-golang-patch-main:
    runs-on: ubuntu-latest
    steps:
    - name: Checkout
      uses: actions/checkout@v4
    - uses: actions/cache@v4
      with:
        path: |
          ~/.cache/go-build
          ~/go/pkg/mod
        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
        restore-keys: |
          ${{ runner.os }}-go-
    - name: Update to latest go version allowable from current Dockerfile
      id: update-go-mod-patch
      run: |
        CONTAINER_NAME=$(cat Dockerfile | grep golang: | head -n 1 | cut -d ' ' -f 3)
        GO_VERSION=$(docker run --rm $CONTAINER_NAME go version | cut -d ' ' -f 3 | cut -d 'o' -f 2)
        echo "Latest golang version allowed by image: $GO_VERSION"
        echo "Updating go.mod go version to latest patch version"
        go get go@$GO_VERSION toolchain@none
        go mod tidy
        echo "container=$CONTAINER_NAME" >> $GITHUB_ENV
        echo "goversion=$GO_VERSION" >> $GITHUB_ENV
    - name: Create PR with updated go.mod if needed
      # if not a PR, (ie. schedule or manual trigger by maintainer) then create a PR
      # For review purposes, PR authors who make changes to this workflow file should push to their main branch to demonstrate the workflow and link to the PR.
      if: github.event_name != 'pull_request'
      run: |
        if ! git diff --exit-code -- go.mod go.sum; then
          git config --global user.email "actions@github.com"
          git config --global user.name "GitHub Action"
          git checkout -B actions/update-go-mod-patch
          git add go.mod go.sum
          git commit -m "Update Go in go.mod to $goversion"
          echo "Pushing to $GITHUB_REPOSITORY at actions/update-go-mod-patch"
          git push --force --set-upstream origin actions/update-go-mod-patch || echo "Please ensure your fork's actions/update-go-mod-patch branch is up to date with upstream/main first."
          echo "PR to $GITHUB_REPOSITORY main"
          gh pr create --title "Update Go in go.mod to $goversion" --body "Updated Go in go.mod to match latest patch available from Dockerfile image: $container" --base main --repo $GITHUB_REPOSITORY
        fi;
        cat go.mod