Move services to plugins/services

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

plugins/services/diff/service.go

@@ -0,0 +1,65 @@
+/*
+   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 diff
+
+import (
+	"context"
+
+	diffapi "github.com/containerd/containerd/v2/api/services/diff/v1"
+	"github.com/containerd/containerd/v2/plugins"
+	"github.com/containerd/containerd/v2/plugins/services"
+	"github.com/containerd/plugin"
+	"github.com/containerd/plugin/registry"
+	"google.golang.org/grpc"
+)
+
+func init() {
+	registry.Register(&plugin.Registration{
+		Type: plugins.GRPCPlugin,
+		ID:   "diff",
+		Requires: []plugin.Type{
+			plugins.ServicePlugin,
+		},
+		InitFn: func(ic *plugin.InitContext) (interface{}, error) {
+			i, err := ic.GetByID(plugins.ServicePlugin, services.DiffService)
+			if err != nil {
+				return nil, err
+			}
+			return &service{local: i.(diffapi.DiffClient)}, nil
+		},
+	})
+}
+
+type service struct {
+	local diffapi.DiffClient
+	diffapi.UnimplementedDiffServer
+}
+
+var _ diffapi.DiffServer = &service{}
+
+func (s *service) Register(gs *grpc.Server) error {
+	diffapi.RegisterDiffServer(gs, s)
+	return nil
+}
+
+func (s *service) Apply(ctx context.Context, er *diffapi.ApplyRequest) (*diffapi.ApplyResponse, error) {
+	return s.local.Apply(ctx, er)
+}
+
+func (s *service) Diff(ctx context.Context, dr *diffapi.DiffRequest) (*diffapi.DiffResponse, error) {
+	return s.local.Diff(ctx, dr)
+}