prep-release.yaml

# Copyright 2025 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

name: Prepare Release

on:
  workflow_call:
    inputs:
      release:
        required: true
        type: string
        default: dev
    outputs:
      release_sha:
        description: "The SHA that was tagged"
        value: ${{ jobs.prep-release.outputs.sha }}

env:
  RELEASE: dev
  GH_TOKEN: ${{ github.token }}

jobs:
  prep-release:
    runs-on: ubuntu-latest
    permissions:
      contents: write
    outputs:
      sha: ${{ steps.get_sha.outputs.sha }} 

    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd #v6
        with:
          ref: main

      - name: Get Commit SHA
        id: get_sha
        run: echo "sha=$(git rev-parse HEAD)" >> $GITHUB_OUTPUT

      - name: Update Rolling Release
        env:
          RELEASE_TAG: ${{ inputs.release || env.RELEASE }}
        run: |
          echo "Processing release for: $RELEASE_TAG"

          # 1. CLEANUP: Check if the release/tag exists and nukes it.
          # This ensures the 'dev' tag is free to move to the new commit.
          if gh release view "$RELEASE_TAG" > /dev/null 2>&1; then
            echo "Existing release found. Deleting '$RELEASE_TAG' to update pointer..."
            gh release delete "$RELEASE_TAG" --cleanup-tag -y
          else
            echo "No existing release for '$RELEASE_TAG'. Creating new one."
          fi

          # 2. CREATE: Create the release pointing to the latest commit (target main).
          echo "Creating release..."
          gh release create "$RELEASE_TAG" \
            --prerelease \
            --target "${{ steps.get_sha.outputs.sha }}" \
            --title "$RELEASE_TAG build" \
            --generate-notes

          echo "Success: $RELEASE_TAG updated to latest commit."