k8s-prepare.yml

name: 'K8s: Prepare k8s-manifests Deploy PR'

on:
  push:
    branches: [ releases/k8s-manifests ]

env:
  BRANCH_RELEASE: releases/k8s-manifests
  BRANCH_DEPLOY: deploys/k8s-manifests


jobs:

  k8s-prepare:
    runs-on: ubuntu-latest
    steps:

    - uses: actions/checkout@v2
      with:
        ref: ${{ env.BRANCH_RELEASE }}

    - name: Configure .kube/config
      run: |
        test -e ~/.kube || mkdir ~/.kube

        echo "${{ secrets.KUBECONFIG_BASE64 }}" | base64 -d > ~/.kube/config

    - name: Install kubectl-neat-diff
      run: |
        sudo wget https://github.com/sh0rez/kubectl-neat-diff/releases/download/v0.1.0/kubectl-neat-diff-linux-amd64 -O /usr/local/bin/kubectl-neat-diff
        sudo chmod +x /usr/local/bin/kubectl-neat-diff
        echo "KUBECTL_EXTERNAL_DIFF=kubectl-neat-diff" >> $GITHUB_ENV

    - name: Generate diff
      run: |
        (
          find . \
            -maxdepth 1 \
            -type d \
            -not -name '.*' \
            -print0 \
          | sort -z \
          | xargs -r0 -n 1 kubectl diff -Rf || true
        ) > /tmp/kube.diff

    - name: Create/update pull request
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      run: |
        # build PR description body
        diff_size=$(stat -c%s /tmp/kube.diff)
        pr_head_describe="$(git describe --always --tag)"

        pr_body="$(cat <<EOF
        Deploy ${BRANCH_RELEASE} ${pr_head_describe}

        \`kubectl diff\` reports that applying ${pr_head_describe} will change:

        \`\`\`diff
        $(if (( diff_size > 50000)); then echo 'diff too big; review locally'; else cat /tmp/kube.diff; fi)
        \`\`\`
        EOF
        )"


        # generate initial commit for base if needed
        if ! git ls-remote --exit-code --heads origin "${BRANCH_DEPLOY}"; then
          git fetch origin --unshallow
          _first_projected_commit=$(git rev-list --max-parents=0 --first-parent HEAD)
          git push origin "${_first_projected_commit}:refs/heads/${BRANCH_DEPLOY}"
        fi


        # check for existing PR
        _existing_pr_number=$(hub pr list -h "${BRANCH_RELEASE}" -f '%I')

        if [ -n "${_existing_pr_number}" ]; then
          echo "Updating PR #${_existing_pr_number}"
          hub issue update "${_existing_pr_number}" -F <(echo "${pr_body}")
        else
          echo "Opening PR"
          hub pull-request -b "${BRANCH_DEPLOY}" -h "${BRANCH_RELEASE}" -F <(echo "${pr_body}") > /tmp/pr.json
        fi

    # - uses: mxschmitt/action-tmate@v3
    #   env:
    #     GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}