From 09565285cfdc5db756414357af27e60487868c2d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Anders=20F=20Bj=C3=B6rklund?= <anders.f.bjorklund@gmail.com>
Date: Mon, 22 Jan 2024 20:56:08 +0100
Subject: [PATCH] Return RuntimeConfig with Linux.CgroupDriver

---
 core/docker_service.go      | 20 ++++++++++++++++++++
 core/docker_service_test.go |  8 ++++++++
 2 files changed, 28 insertions(+)

diff --git a/core/docker_service.go b/core/docker_service.go
index 46c017d04..f35290b36 100644
--- a/core/docker_service.go
+++ b/core/docker_service.go
@@ -446,6 +446,26 @@ func (ds *dockerService) Status(
 	return resp, nil
 }
 
+// RuntimeConfig returns the config of the runtime.
+func (ds *dockerService) RuntimeConfig(
+	_ context.Context,
+	r *runtimeapi.RuntimeConfigRequest,
+) (*runtimeapi.RuntimeConfigResponse, error) {
+	resp := &runtimeapi.RuntimeConfigResponse{}
+	if runtime.GOOS == "linux" {
+		resp.Linux = &runtimeapi.LinuxRuntimeConfiguration{}
+		switch ds.cgroupDriver {
+		case "cgroupfs":
+			resp.Linux.CgroupDriver = runtimeapi.CgroupDriver_CGROUPFS
+		case "systemd":
+			resp.Linux.CgroupDriver = runtimeapi.CgroupDriver_SYSTEMD
+		default:
+			return nil, fmt.Errorf("unknown cgroup driver: %s", ds.cgroupDriver)
+		}
+	}
+	return resp, nil
+}
+
 func (ds *dockerService) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	if ds.streamingServer != nil {
 		ds.streamingServer.ServeHTTP(w, r)
diff --git a/core/docker_service_test.go b/core/docker_service_test.go
index a9804f036..542fed074 100644
--- a/core/docker_service_test.go
+++ b/core/docker_service_test.go
@@ -163,6 +163,14 @@ func TestStatus(t *testing.T) {
 	}, statusResp.Status)
 }
 
+// TestRuntimeConfig tests the runtime config logic.
+func TestRuntimeConfig(t *testing.T) {
+	ds, fDocker, _ := newTestDockerService()
+
+	configResp, err := ds.RuntimeConfig(getTestCTX(), &runtimeapi.RuntimeConfigRequest{})
+	require.NoError(t, err)
+}
+
 func TestVersion(t *testing.T) {
 	ds, _, _ := newTestDockerService()