Support named pipe mounts for Windows containers

Adds support to mount named pipes into Windows containers. This support
already exists in hcsshim, so this change just passes them through
correctly in cri. Named pipe mounts must start with "\\.\pipe\".

Signed-off-by: Kevin Parsons <kevpar@microsoft.com>

pkg/server/container_create_windows_test.go

@@ -167,3 +167,23 @@ func TestMountCleanPath(t *testing.T) {
 	specCheck(t, testID, testSandboxID, testPid, spec)
 	checkMount(t, spec.Mounts, "c:\\test\\host-path", "c:\\test\\container-path", "", []string{"rw"}, nil)
 }
+
+func TestMountNamedPipe(t *testing.T) {
+	testID := "test-id"
+	testSandboxID := "sandbox-id"
+	testContainerName := "container-name"
+	testPid := uint32(1234)
+	nsPath := "test-cni"
+	c := newTestCRIService()
+
+	containerConfig, sandboxConfig, imageConfig, specCheck := getCreateContainerTestData()
+	containerConfig.Mounts = append(containerConfig.Mounts, &runtime.Mount{
+		ContainerPath: `\\.\pipe\foo`,
+		HostPath:      `\\.\pipe\foo`,
+	})
+	spec, err := c.containerSpec(testID, testSandboxID, testPid, nsPath, testContainerName, containerConfig, sandboxConfig, imageConfig, nil, config.Runtime{})
+	assert.NoError(t, err)
+	assert.NotNil(t, spec)
+	specCheck(t, testID, testSandboxID, testPid, spec)
+	checkMount(t, spec.Mounts, `\\.\pipe\foo`, `\\.\pipe\foo`, "", []string{"rw"}, nil)
+}