From 7dc0a7149523492d9282d2a68462462e22fe3a76 Mon Sep 17 00:00:00 2001
From: Scott Dickerson <sdickers@redhat.com>
Date: Tue, 14 May 2024 09:35:00 -0400
Subject: [PATCH] :seedling: Test image build when build related files change
 (#1907)

If the workflow is run from a PR, and the PR includes a change to the
`Dockerfile` or `package-lock.json`, then run image builds for all of
our target platforms.

The images are built but not pushed to any repository.

We want to be reasonably sure that any major build file changes will not
cause the image-build-and-push on PR merge workflow to break. Doing the
image build here should reveal most problems much earlier. For example,
a npm version update in the build container could break github action
`nofiles` or network access capabilities for the npm install.

See #1742, #1746, and #1781 for some other examples of when this check
could have caught issues before a PR merge.

Supports: #1883

Signed-off-by: Scott J Dickerson <sdickers@redhat.com>
---
 .github/workflows/ci-image-build.yml | 105 +++++++++++++++++++++++++++
 .github/workflows/image-build.yaml   |   4 +
 2 files changed, 109 insertions(+)
 create mode 100644 .github/workflows/ci-image-build.yml

diff --git a/.github/workflows/ci-image-build.yml b/.github/workflows/ci-image-build.yml
new file mode 100644
index 0000000000..de68cc8d89
--- /dev/null
+++ b/.github/workflows/ci-image-build.yml
@@ -0,0 +1,105 @@
+name: CI (test image build for a PR with build related changes)
+
+on:
+  pull_request:
+    branches:
+      - "main"
+      - "release-*"
+
+jobs:
+  checks:
+    runs-on: ubuntu-latest
+    outputs:
+      should-test: ${{ steps.check-changes.outputs.should-test }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: What files changed?
+        id: changed
+        uses: tj-actions/changed-files@v44
+        with:
+          files: |
+            Dockerfile
+            package-lock.json
+
+      - name: Check if build related files have been changed in a PR
+        id: check-changes
+        env:
+          IS_PR: ${{ !!github.event.pull_request }}
+          ANY_MODIFIED: ${{ steps.changed.outputs.any_modified }}
+        run: |
+          TEST_IMAGE_BUILD=$(
+            if [[ $IS_PR == true ]] && [[ $ANY_MODIFIED == true ]]; then
+              echo "true"
+            else
+              echo "false"
+            fi
+          )
+
+          echo "is-pr=$IS_PR" >> "$GITHUB_OUTPUT"
+          echo "changed=${ANY_MODIFIED:-false}" >> "$GITHUB_OUTPUT"
+          echo "should-test=$TEST_IMAGE_BUILD" >> "$GITHUB_OUTPUT"
+
+      - name: Summarize findings
+        env:
+          MODIFIED_FILES: ${{ steps.changed.outputs.all_modified_files }}
+        run: |
+          cat >> "$GITHUB_STEP_SUMMARY" <<EOF
+          ## Findings
+          PR triggered? \`${{ steps.check-changes.outputs.is-pr }}\`
+          PR includes a build file related change? \`${{ steps.check-changes.outputs.changed }}\`
+          Should the image build be tested? \`${{ steps.check-changes.outputs.should-test }}\`
+          EOF
+
+          if [[ -n "$MODIFIED_FILES" ]]; then
+            echo "## Build related modified files" >> "$GITHUB_STEP_SUMMARY"
+            for file in ${MODIFIED_FILES}; do
+              echo "  - \`$file\`" >> "$GITHUB_STEP_SUMMARY"
+            done
+          fi
+
+  #
+  # Based on:
+  #   - image-build.yaml
+  #   - konveyor/release-tools/.github/workflows/build-push-images.yaml@main
+  #
+  # Only test the image build, no push to quay is required.
+  #
+  test-image-build:
+    runs-on: ubuntu-latest
+    needs: checks
+    if: ${{ needs.checks.outputs.should-test == 'true' }}
+
+    strategy:
+      fail-fast: true
+      matrix:
+        architecture: # keep this list in sync with `image-build.yaml`
+          - amd64
+          - arm64
+
+    concurrency:
+      group: test-image-build-${{ matrix.architecture }}_${{ github.ref }}
+      cancel-in-progress: true
+
+    steps:
+      - name: Checkout merge commit for PR${{ github.event.pull_request.number }}
+        uses: actions/checkout@v4
+
+      - name: Setup QEMU to be able to build on ${{ matrix.architecture }}
+        if: ${{ matrix.architecture != 'amd64' }}
+        uses: docker/setup-qemu-action@master
+        with:
+          platforms: ${{ matrix.architecture }}
+
+      - name: Test build image on ${{ matrix.architecture }}
+        id: test-build
+        uses: redhat-actions/buildah-build@main
+        with:
+          image: "tackle2-ui"
+          tags: pr${{ github.event.pull_request.number }}-${{ matrix.architecture }}
+          extra-args: "--no-cache --rm --ulimit nofile=4096:4096"
+          archs: ${{ matrix.architecture }}
+          labels: ""
+          containerfiles: "./Dockerfile"
+          context: "."
diff --git a/.github/workflows/image-build.yaml b/.github/workflows/image-build.yaml
index 82ce7b1b88..7bcbcc5fff 100644
--- a/.github/workflows/image-build.yaml
+++ b/.github/workflows/image-build.yaml
@@ -20,9 +20,13 @@ jobs:
       registry: "quay.io/konveyor"
       image_name: "tackle2-ui"
       containerfile: "./Dockerfile"
+
+      # keep the architectures in sync with `ci-image-build.yml`
       architectures: '[ "amd64", "arm64" ]'
+
       # 2023-03-19: currently needed for npm@10
       extra-args: "--ulimit nofile=4096:4096"
+
     secrets:
       registry_username: ${{ secrets.QUAY_PUBLISH_ROBOT }}
       registry_password: ${{ secrets.QUAY_PUBLISH_TOKEN }}