From 7104c627693052d2dcc329cac2062e51cfaa765d Mon Sep 17 00:00:00 2001
From: Richard Schneeman <rschneeman@salesforce.com>
Date: Tue, 31 Jan 2023 14:37:48 -0600
Subject: [PATCH] Release Buildpack action (#111)

* Release Buildpack action

* Rev version

* Remove extra newline

* Guard against docker double push
---
 .github/workflows/release.yml  | 115 +++++++++++++++++++++++++++++++++
 buildpacks/ruby/buildpack.toml |   7 ++
 2 files changed, 122 insertions(+)
 create mode 100644 .github/workflows/release.yml

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 00000000..4a21049b
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,115 @@
+name: Release Buildpack
+
+on:
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    name: Release heroku/ruby
+    runs-on: ubuntu-20.04 # ubuntu-latest currently resolves to 18.04 which does not have aws-cli 2.x yet
+    steps:
+
+      - id: checkout
+        name: "Checkout code"
+        uses: actions/checkout@v3
+
+      - id: setup-pack
+        name: "Setup pack"
+        uses: buildpacks/github-actions/setup-pack@v5.0.1
+
+      - name: Install yj
+        uses: buildpacks/github-actions/setup-tools@v5.0.1
+
+      - id: install-musl-tools
+        run: sudo apt-get install musl-tools
+
+      - id: install-rust-toolchain
+        name: "Install Rust toolchain"
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+          target: "x86_64-unknown-linux-musl"
+
+      - id: install-libcnb-cargo
+        name: "Install libcnb-cargo"
+        uses: actions-rs/install@v0.1
+        with:
+          crate: libcnb-cargo
+          version: latest
+
+      - id: compile
+        name: "Compile buildpack"
+        run: cargo libcnb package --release
+        working-directory: ./buildpacks/ruby
+
+      - id: metadata
+        name: "Read buildpack metadata"
+        run: |
+          export BUILDPACK_PATH="target/buildpack/release/heroku_ruby"
+          echo "buildpack_path=$BUILDPACK_PATH" >> $GITHUB_ENV
+          echo "buildpack_id=$(yj -t < $BUILDPACK_PATH/buildpack.toml | jq -r .buildpack.id)" >> $GITHUB_ENV
+          echo "buildpack_version=$(yj -t < $BUILDPACK_PATH/buildpack.toml | jq -r .buildpack.version)" >> $GITHUB_ENV
+          echo "buildpack_repo=$(yj -t < $BUILDPACK_PATH/buildpack.toml | jq -r .metadata.release.image.repository)" >> $GITHUB_ENV
+          echo "buildpack_file=heroku_ruby.cnb" >> $GITHUB_ENV
+
+      - id: package-buildpack
+        name: "Package buildpack"
+        run: pack buildpack package --path "${{ env.buildpack_path }}" --format file "${{ env.buildpack_file}}"
+
+      - id: dockerhub-login
+        name: "Login to Docker Hub"
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKER_HUB_USER }}
+          password: ${{ secrets.DOCKER_HUB_TOKEN }}
+
+      - id: guard-double-publish
+        name: "Check version is unique on Docker Hub"
+        run: |
+          if docker manifest inspect "${{ env.buildpack_repo }}:${{ env.buildpack_version }}" > /dev/null; then
+            echo "Duplicate version found on dockerhub ${{ env.buildpack_repo }}:${{ env.buildpack_version }}"
+            exit 1
+          fi
+
+      - id: publish-image
+        name: "Publish buildpack to image registry"
+        run: pack buildpack package --path "${{ env.buildpack_path }}" --publish "${{ env.buildpack_repo }}:${{ env.buildpack_version }}"
+
+      - id: image-digest
+        name: "Calculate buildpack image digest"
+        run: |
+          echo "buildpack_digest=$(crane digest ${{ env.buildpack_repo }}:${{ env.buildpack_version }})" >> $GITHUB_ENV
+
+      - id: add-registry-entry
+        name: "Request Buildpack Registry Entry"
+        uses: docker://ghcr.io/buildpacks/actions/registry/request-add-entry:5.0.1
+        with:
+          token: ${{ secrets.CNB_REGISTRY_RELEASE_BOT_GITHUB_TOKEN }}
+          id: ${{ env.buildpack_id }}
+          version: ${{ env.buildpack_version }}
+          address: ${{ env.buildpack_repo }}@${{ env.buildpack_digest }}
+
+      - id: create_release
+        name: Create Release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ env.buildpack_id }}_${{ env.buildpack_version }}
+          release_name: ${{ env.buildpack_id }} ${{ env.buildpack_version }}
+          body: |
+            See the [CHANGELOG](./CHANGELOG.md) for details.
+          draft: false
+          prerelease: false
+
+      - id: upload_package
+        name: Upload buildpackage to release
+        uses: svenstaro/upload-release-action@v2
+        with:
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          file: ${{ env.buildpack_file }}
+          tag: ${{ env.buildpack_id }}_${{ env.buildpack_version }}
+          overwrite: true
diff --git a/buildpacks/ruby/buildpack.toml b/buildpacks/ruby/buildpack.toml
index 7263274f..1b526276 100644
--- a/buildpacks/ruby/buildpack.toml
+++ b/buildpacks/ruby/buildpack.toml
@@ -16,3 +16,10 @@ id = "heroku-22"
 
 [[buildpack.licenses]]
 type = "BSD-3-Clause"
+
+[metadata]
+
+[metadata.release]
+
+[metadata.release.image]
+repository = "docker.io/heroku/buildpack-ruby"