Merge pull request #207 from crazy-max/note-setup-buildx

readme: note about usage with setup-buildx-action

.github/workflows/ci.yml

@@ -102,3 +102,22 @@ jobs:
       -
         name: Available platforms
         run: echo ${{ steps.qemu.outputs.platforms }}
+
+  version:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        image:
+          - tonistiigi/binfmt:master
+          - tonistiigi/binfmt:latest
+          - tonistiigi/binfmt:qemu-v7.0.0
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v4
+      -
+        name: Set up QEMU
+        uses: ./
+        with:
+          image: ${{ matrix.image }}

README.md

@@ -35,6 +35,19 @@ jobs:
         uses: docker/setup-qemu-action@v3
 ```
 
+> [!NOTE]
+> If you are using [`docker/setup-buildx-action`](https://github.com/docker/setup-buildx-action),
+> this action should come before it:
+> 
+> ```yaml
+>     -
+>       name: Set up QEMU
+>       uses: docker/setup-qemu-action@v3
+>     -
+>       name: Set up Docker Buildx
+>       uses: docker/setup-buildx-action@v3
+> ```
+
 ## Customizing
 
 ### inputs

src/main.ts

@@ -33,6 +33,16 @@ actionsToolkit.run(
       });
     });
 
+    await core.group(`Binfmt version`, async () => {
+      await Docker.getExecOutput(['run', '--rm', '--privileged', input.image, '--version'], {
+        ignoreReturnCode: true
+      }).then(res => {
+        if (res.stderr.length > 0 && res.exitCode != 0) {
+          throw new Error(res.stderr.match(/(.*)\s*$/)?.[0]?.trim() ?? 'unknown error');
+        }
+      });
+    });
+
     await core.group(`Installing QEMU static binaries`, async () => {
       await Docker.getExecOutput(['run', '--rm', '--privileged', input.image, '--install', input.platforms], {
         ignoreReturnCode: true