Move unix specific logic into _unix.go

Signed-off-by: Lantao Liu <lantaol@google.com>

pkg/server/container_create_windows.go

@@ -0,0 +1,46 @@
+// +build windows
+
+/*
+Copyright The containerd Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package server
+
+import (
+	"github.com/containerd/containerd/errdefs"
+	"github.com/containerd/containerd/oci"
+	imagespec "github.com/opencontainers/image-spec/specs-go/v1"
+	runtimespec "github.com/opencontainers/runtime-spec/specs-go"
+	runtime "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"
+
+	"github.com/containerd/cri/pkg/config"
+)
+
+// No container mounts for windows.
+func (c *criService) containerMounts(sandboxID string, config *runtime.ContainerConfig) []*runtime.Mount {
+	return nil
+}
+
+// TODO(windows): Add windows container spec.
+func (c *criService) containerSpec(id string, sandboxID string, sandboxPid uint32, netNSPath string,
+	config *runtime.ContainerConfig, sandboxConfig *runtime.PodSandboxConfig, imageConfig *imagespec.ImageConfig,
+	extraMounts []*runtime.Mount, ociRuntime config.Runtime) (*runtimespec.Spec, error) {
+	return nil, errdefs.ErrNotImplemented
+}
+
+// No extra spec options needed for windows.
+func (c *criService) containerSpecOpts(config *runtime.ContainerConfig, imageConfig *imagespec.ImageConfig) ([]oci.SpecOpts, error) {
+	return nil, nil
+}