pkg/kubelet/userns: Provide stub implementation for windows

Signed-off-by: Rodrigo Campos <rodrigoca@microsoft.com>

pkg/kubelet/userns/types.go

@@ -0,0 +1,29 @@
+/*
+Copyright 2025 The Kubernetes 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 userns
+
+import "k8s.io/apimachinery/pkg/types"
+
+// Here go types that are common for all supported OS (windows, linux).
+
+type userNsPodsManager interface {
+	HandlerSupportsUserNamespaces(runtimeHandler string) (bool, error)
+	GetPodDir(podUID types.UID) string
+	ListPodsFromDisk() ([]types.UID, error)
+	GetKubeletMappings() (uint32, uint32, error)
+	GetMaxPods() int
+}

pkg/kubelet/userns/userns_manager.go

@@ -1,3 +1,6 @@
+//go:build !windows
+// +build !windows
+
 /*
 Copyright 2022 The Kubernetes Authors.
 
@@ -43,14 +46,6 @@ const userNsLength = (1 << 16)
 // since Go maps never free memory.
 const mapReInitializeThreshold = 1000
 
-type userNsPodsManager interface {
-	HandlerSupportsUserNamespaces(runtimeHandler string) (bool, error)
-	GetPodDir(podUID types.UID) string
-	ListPodsFromDisk() ([]types.UID, error)
-	GetKubeletMappings() (uint32, uint32, error)
-	GetMaxPods() int
-}
-
 type UsernsManager struct {
 	used    *allocator.AllocationBitmap
 	usedBy  map[types.UID]uint32 // Map pod.UID to range used

pkg/kubelet/userns/userns_manager_disabled_test.go

@@ -1,3 +1,6 @@
+//go:build !windows
+// +build !windows
+
 /*
 Copyright 2022 The Kubernetes Authors.
 

pkg/kubelet/userns/userns_manager_switch_test.go

@@ -1,3 +1,6 @@
+//go:build !windows
+// +build !windows
+
 /*
 Copyright 2024 The Kubernetes Authors.
 

pkg/kubelet/userns/userns_manager_test.go

@@ -1,3 +1,6 @@
+//go:build !windows
+// +build !windows
+
 /*
 Copyright 2022 The Kubernetes Authors.
 

pkg/kubelet/userns/userns_manager_windows.go

@@ -0,0 +1,50 @@
+/*
+Copyright 2025 The Kubernetes 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 userns
+
+import (
+	v1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/types"
+	runtimeapi "k8s.io/cri-api/pkg/apis/runtime/v1"
+	kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
+)
+
+type UsernsManager struct{}
+
+func MakeUserNsManager(kl userNsPodsManager) (*UsernsManager, error) {
+	return nil, nil
+}
+
+// Release releases the user namespace allocated to the specified pod.
+func (m *UsernsManager) Release(podUID types.UID) {
+	return
+}
+
+func (m *UsernsManager) GetOrCreateUserNamespaceMappings(pod *v1.Pod, runtimeHandler string) (*runtimeapi.UserNamespace, error) {
+	return nil, nil
+}
+
+// CleanupOrphanedPodUsernsAllocations reconciliates the state of user namespace
+// allocations with the pods actually running. It frees any user namespace
+// allocation for orphaned pods.
+func (m *UsernsManager) CleanupOrphanedPodUsernsAllocations(pods []*v1.Pod, runningPods []*kubecontainer.Pod) error {
+	return nil
+}
+
+func EnabledUserNamespacesSupport() bool {
+	return false
+}