fix panic when using 'compose up --build'

Signed-off-by: Guillaume Lours <705411+glours@users.noreply.github.com>

cmd/compose/tracing.go

@@ -20,8 +20,8 @@ import (
 	"github.com/moby/buildkit/util/tracing/detect"
 	"go.opentelemetry.io/otel"
 
-	_ "github.com/moby/buildkit/util/tracing/detect/delegated" //nolint:revive
+	_ "github.com/moby/buildkit/util/tracing/detect/delegated" //nolint:blank-imports
-	_ "github.com/moby/buildkit/util/tracing/env"              //nolint:revive
+	_ "github.com/moby/buildkit/util/tracing/env"              //nolint:blank-imports
 )
 
 func init() {

pkg/compose/build.go

@@ -173,7 +173,11 @@ func (s *composeService) getBuildOptions(project *types.Project, images map[stri
 			if len(opt.Platforms) > 1 {
 				opt.Exports = []bclient.ExportEntry{{
 					Type: "docker",
+					Attrs: map[string]string{
+						"load": "true",
+					},
 				}}
+				opt.Platforms = []specs.Platform{}
 			}
 			opts[imageName] = opt
 			continue

pkg/compose/build_buildkit.go

@@ -37,9 +37,9 @@ import (
 
 	"github.com/docker/buildx/build"
 	"github.com/docker/buildx/driver"
-	_ "github.com/docker/buildx/driver/docker"           //nolint:revive
+	_ "github.com/docker/buildx/driver/docker"           //nolint:blank-imports
-	_ "github.com/docker/buildx/driver/docker-container" //nolint:revive
+	_ "github.com/docker/buildx/driver/docker-container" //nolint:blank-imports
-	_ "github.com/docker/buildx/driver/kubernetes"       //nolint:revive
+	_ "github.com/docker/buildx/driver/kubernetes"       //nolint:blank-imports
 	xprogress "github.com/docker/buildx/util/progress"
 )
 
@@ -56,8 +56,10 @@ func (s *composeService) doBuildBuildkit(ctx context.Context, opts map[string]bu
 	defer cancel()
 	w := xprogress.NewPrinter(progressCtx, s.stdout(), os.Stdout, mode)
 
-	// We rely on buildx "docker" builder integrated in docker engine, so don't need a DockerAPI here
+	// Get the DockerAPI if a "docker" export is defined (ie: up and run command), otherwise get nil and let use the default buildx builder
-	response, err := build.Build(ctx, dis, opts, nil, filepath.Dir(s.configFile().Filename), w)
+	API := getDockerAPI(s.dockerCli, opts)
+
+	response, err := build.Build(ctx, dis, opts, API, filepath.Dir(s.configFile().Filename), w)
 	errW := w.Wait()
 	if err == nil {
 		err = errW
@@ -252,3 +254,29 @@ func configFromContext(endpointName string, s ctxstore.Reader) (clientcmd.Client
 	}
 	return ctxkube.ConfigFromContext(endpointName, s)
 }
+
+type internalAPI struct {
+	dockerCli command.Cli
+}
+
+func (a *internalAPI) DockerAPI(name string) (dockerclient.APIClient, error) {
+	if name == "" {
+		name = a.dockerCli.CurrentContext()
+	}
+	return clientForEndpoint(a.dockerCli, name)
+}
+
+func dockerAPI(dockerCli command.Cli) *internalAPI {
+	return &internalAPI{dockerCli: dockerCli}
+}
+
+func getDockerAPI(cli command.Cli, opts map[string]build.Options) *internalAPI {
+	for _, opt := range opts {
+		for _, export := range opt.Exports {
+			if export.Type == "docker" {
+				return dockerAPI(cli)
+			}
+		}
+	}
+	return nil
+}

pkg/e2e/build_test.go

@@ -258,6 +258,7 @@ func TestBuildPlatformsWithCorrectBuildxConfig(t *testing.T) {
 	assert.NilError(t, result.Error)
 
 	t.Cleanup(func() {
+		c.RunDockerComposeCmd(t, "--project-directory", "fixtures/build-test/platforms", "down")
 		_ = c.RunDockerCmd(t, "buildx", "rm", "-f", "build-platform")
 		_ = c.RunDockerCmd(t, "rm", "-f", "registry")
 	})
@@ -279,6 +280,12 @@ func TestBuildPlatformsWithCorrectBuildxConfig(t *testing.T) {
 		res.Assert(t, icmd.Expected{Out: `"architecture": "arm64",`})
 
 	})
+
+	t.Run("multi-arch up --build", func(t *testing.T) {
+		res := c.RunDockerComposeCmdNoCheck(t, "--project-directory", "fixtures/build-test/platforms", "up", "--build")
+		assert.NilError(t, res.Error, res.Stderr())
+		res.Assert(t, icmd.Expected{Out: "platforms-platforms-1 exited with code 0"})
+	})
 }
 
 func TestBuildPlatformsStandardErrors(t *testing.T) {

pkg/e2e/fixtures/build-test/platforms/Dockerfile

@@ -12,6 +12,11 @@
 #   See the License for the specific language governing permissions and
 #   limitations under the License.
 
-FROM alpine
+FROM --platform=$BUILDPLATFORM golang:alpine AS build
 
-RUN echo "SUCCESS"
+ARG TARGETPLATFORM
+ARG BUILDPLATFORM
+RUN echo "I am running on $BUILDPLATFORM, building for $TARGETPLATFORM" > /log
+
+FROM alpine
+COPY --from=build /log /log

pkg/e2e/fixtures/build-test/platforms/compose.yaml

@@ -1,7 +1,6 @@
 services:
   platforms:
     image: localhost:5001/build-test-platform:test
-    platform: linux/amd64
     build:
       context: .
       platforms: