Merge pull request #5 from buildpacks/jkutner/verify-package

Add verify-package image 

Signed-off-by: Ben Hale <bhale@vmware.com>

.github/workflows/create-verify-buildpackage-action.yml

@@ -0,0 +1,73 @@
+name: Create Action verify-buildpackage
+"on":
+    pull_request:
+        paths:
+            - verify/**
+    push:
+        branches:
+            - main
+        paths:
+        - verify/**
+    release:
+        types:
+            - published
+jobs:
+    create-action:
+        name: Create Action
+        runs-on:
+            - ubuntu-latest
+        steps:
+            - if: ${{ github.event_name != 'pull_request' || ! github.event.pull_request.head.repo.fork }}
+              name: Docker login ghcr.io
+              uses: docker/login-action@v1
+              with:
+                password: ${{ secrets.IMPLEMENTATION_GITHUB_TOKEN }}
+                registry: ghcr.io
+                username: ${{ secrets.IMPLEMENTATION_GITHUB_USERNAME }}
+            - uses: actions/checkout@v2
+            - id: version
+              name: Compute Version
+              run: |
+                #!/usr/bin/env bash
+
+                set -euo pipefail
+
+                if [[ ${GITHUB_REF} =~ refs/tags/v([0-9]+\.[0-9]+\.[0-9]+) ]]; then
+                  VERSION=${BASH_REMATCH[1]}
+                elif [[ ${GITHUB_REF} =~ refs/heads/(.+) ]]; then
+                  VERSION=${BASH_REMATCH[1]}
+                else
+                  VERSION=$(git rev-parse --short HEAD)
+                fi
+
+                echo "::set-output name=version::${VERSION}"
+                echo "Selected ${VERSION} from
+                  * ref: ${GITHUB_REF}
+                  * sha: ${GITHUB_SHA}
+                "
+            - name: Create Action
+              run: |
+                #!/usr/bin/env bash
+
+                set -euo pipefail
+
+                echo "::group::Building ${TARGET}:${VERSION}"
+                  docker build \
+                    --file Dockerfile \
+                    --build-arg "SOURCE=${SOURCE}" \
+                    --tag "${TARGET}:${VERSION}" \
+                    .
+                echo "::endgroup::"
+
+                if [[ "${PUSH}" == "true" ]]; then
+                  echo "::group::Pushing ${TARGET}:${VERSION}"
+                    docker push "${TARGET}:${VERSION}"
+                  echo "::endgroup::"
+                else
+                  echo "Skipping push"
+                fi
+              env:
+                PUSH: ${{ github.event_name != 'pull_request' }}
+                SOURCE: verify/cmd
+                TARGET: ghcr.io/buildpacks/actions/verify-buildpackage
+                VERSION: ${{ steps.version.outputs.version }}

README.md

@@ -3,6 +3,21 @@
 
 [gha]: https://docs.github.com/en/free-pro-team@latest/actions
 
+- [GitHub Actions](#github-actions)
+  - [Buildpack Info Action](#buildpack-info-action)
+      - [Inputs](#inputs)
+      - [Outputs](#outputs)
+  - [Registry Action](#registry-action)
+    - [Add](#add)
+      - [Inputs](#inputs-1)
+    - [Yank](#yank)
+      - [Inputs](#inputs-2)
+  - [Setup pack CLI Action](#setup-pack-cli-action)
+      - [Inputs](#inputs-3)
+  - [Verify Buildpackage Action](#verify-buildpackage-action)
+      - [Inputs](#inputs-4)
+  - [License](#license)
+
 ## Buildpack Info Action
 The buildpack-info action parses a `buildpack.toml` and exposes the contents of the `[buildpack]` block as output parameters.
 
@@ -84,8 +99,25 @@ uses: buildpacks/github-actions/setup-pack
 | `pack-version` | Optional version of [`pack`][pack] to install. Defaults to latest release.
 | `yj-version` | Optional version of [`yj`][yj] to install. Defaults to latest release. 
 
+## Verify Buildpackage Action
+The verify-buildpackage action parses the metadata on a buildpackage and verifies that the `id` and `version` match expected values.
+
+```yaml
+uses: docker://ghcr.io/buildpacks/actions/verify-buildpackage
+with:
+  id:      test-buildpack
+  version: "1.0.0"
+  address: ghcr.io/example/test-buildpack@sha256:04ba2d17480910bd340f0305d846b007148dafd64bc6fc2626870c174b7c7de7
+```
+
+#### Inputs
+| Parameter | Description
+| :-------- | :----------
+| `id` | The expected `id` for the buildpackage
+| `version` | The expected `version` for the buildpackage
+| `address` | The digest-style address of the buildpackage to verify
+
 ## License
 This library is released under version 2.0 of the [Apache License][a].
 
 [a]: https://www.apache.org/licenses/LICENSE-2.0
-

go.mod

@@ -4,6 +4,7 @@ go 1.15
 
 require (
 	github.com/buildpacks/libcnb v1.18.0
+	github.com/google/go-containerregistry v0.1.4
 	github.com/google/go-github/v32 v32.1.0
 	github.com/onsi/gomega v1.10.3
 	github.com/pelletier/go-toml v1.8.1