DOCKER_BUILD_EXPORT_LEGACY env var to opt-in for legacy export

Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>

Author: crazy-max

.github/workflows/ci.yml

@@ -653,6 +653,35 @@ jobs:
         env:
           DOCKER_BUILD_RECORD_RETENTION_DAYS: ${{ matrix.days }}
 
+  export-legacy:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        legacy:
+          - false
+          - true
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v4
+      -
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+        with:
+          version: ${{ inputs.buildx-version || env.BUILDX_VERSION }}
+          driver-opts: |
+            image=${{ inputs.buildkit-image || env.BUILDKIT_IMAGE }}
+      -
+        name: Build
+        uses: ./
+        with:
+          files: |
+            ./test/config.hcl
+          targets: app
+        env:
+          DOCKER_BUILD_EXPORT_LEGACY: ${{ matrix.legacy }}
+
   checks:
     runs-on: ubuntu-latest
     strategy:

README.md

@@ -230,6 +230,7 @@ The following outputs are available
 | `DOCKER_BUILD_SUMMARY`               | Bool   | `true`  | If `false`, [build summary](https://docs.docker.com/build/ci/github-actions/build-summary/) generation is disabled                                                                                                                                                 |
 | `DOCKER_BUILD_RECORD_UPLOAD`         | Bool   | `true`  | If `false`, build record upload as [GitHub artifact](https://docs.github.com/en/actions/using-workflows/storing-workflow-data-as-artifacts) is disabled                                                                                                            |
 | `DOCKER_BUILD_RECORD_RETENTION_DAYS` | Number |         | Duration after which build record artifact will expire in days. Defaults to repository/org [retention settings](https://docs.github.com/en/actions/learn-github-actions/usage-limits-billing-and-administration#artifact-and-log-retention-policy) if unset or `0` |
+| `DOCKER_BUILD_EXPORT_LEGACY`         | Bool   | `false` | If `true`, exports build using legacy export-build tool instead of [`buildx history export` command](https://docs.docker.com/reference/cli/docker/buildx/history/export/)                                                                                          |
 
 ## Subactions
 

src/main.ts

@@ -220,7 +220,8 @@ actionsToolkit.run(
 
           const buildxHistory = new BuildxHistory();
           const exportRes = await buildxHistory.export({
-            refs: stateHelper.buildRefs
+            refs: stateHelper.buildRefs,
+            useContainer: buildExportLegacy()
           });
           core.info(`Build records written to ${exportRes.dockerbuildFilename} (${Util.formatFileSize(exportRes.dockerbuildSize)})`);
 
@@ -317,3 +318,10 @@ function buildRecordRetentionDays(): number | undefined {
     return res;
   }
 }
+
+function buildExportLegacy(): boolean {
+  if (process.env.DOCKER_BUILD_EXPORT_LEGACY) {
+    return Util.parseBool(process.env.DOCKER_BUILD_EXPORT_LEGACY);
+  }
+  return false;
+}