Move runtime to core/runtime

Signed-off-by: Derek McGowan <derek@mcg.dev>

core/runtime/opts/opts_linux.go

@@ -0,0 +1,45 @@
+/*
+   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 opts
+
+import (
+	"context"
+
+	"github.com/containerd/cgroups/v3"
+	cgroup1 "github.com/containerd/cgroups/v3/cgroup1"
+	cgroup2 "github.com/containerd/cgroups/v3/cgroup2"
+	"github.com/containerd/containerd/v2/pkg/namespaces"
+)
+
+// WithNamespaceCgroupDeletion removes the cgroup directory that was created for the namespace
+func WithNamespaceCgroupDeletion(ctx context.Context, i *namespaces.DeleteInfo) error {
+	if cgroups.Mode() == cgroups.Unified {
+		cg, err := cgroup2.Load(i.Name)
+		if err != nil {
+			return err
+		}
+		return cg.Delete()
+	}
+	cg, err := cgroup1.Load(cgroup1.StaticPath(i.Name))
+	if err != nil {
+		if err == cgroup1.ErrCgroupDeleted {
+			return nil
+		}
+		return err
+	}
+	return cg.Delete()
+}