Move plugin type definitions to containerd plugins package

The plugins packages defines the plugins used by containerd.
Move all the types and properties to this package.

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

Author: dmcgowan

plugin.go

@@ -50,56 +50,6 @@ type Type string
 
 func (t Type) String() string { return string(t) }
 
-const (
-	// InternalPlugin implements an internal plugin to containerd
-	InternalPlugin Type = "io.containerd.internal.v1"
-	// RuntimePlugin implements a runtime
-	RuntimePlugin Type = "io.containerd.runtime.v1"
-	// RuntimePluginV2 implements a runtime v2
-	RuntimePluginV2 Type = "io.containerd.runtime.v2"
-	// ServicePlugin implements a internal service
-	ServicePlugin Type = "io.containerd.service.v1"
-	// GRPCPlugin implements a grpc service
-	GRPCPlugin Type = "io.containerd.grpc.v1"
-	// TTRPCPlugin implements a ttrpc shim service
-	TTRPCPlugin Type = "io.containerd.ttrpc.v1"
-	// SnapshotPlugin implements a snapshotter
-	SnapshotPlugin Type = "io.containerd.snapshotter.v1"
-	// TaskMonitorPlugin implements a task monitor
-	TaskMonitorPlugin Type = "io.containerd.monitor.v1"
-	// DiffPlugin implements a differ
-	DiffPlugin Type = "io.containerd.differ.v1"
-	// MetadataPlugin implements a metadata store
-	MetadataPlugin Type = "io.containerd.metadata.v1"
-	// ContentPlugin implements a content store
-	ContentPlugin Type = "io.containerd.content.v1"
-	// GCPlugin implements garbage collection policy
-	GCPlugin Type = "io.containerd.gc.v1"
-	// EventPlugin implements event handling
-	EventPlugin Type = "io.containerd.event.v1"
-	// LeasePlugin implements lease manager
-	LeasePlugin Type = "io.containerd.lease.v1"
-	// StreamingPlugin implements a stream manager
-	StreamingPlugin Type = "io.containerd.streaming.v1"
-	// TracingProcessorPlugin implements a open telemetry span processor
-	TracingProcessorPlugin Type = "io.containerd.tracing.processor.v1"
-	// NRIApiPlugin implements the NRI adaptation interface for containerd.
-	NRIApiPlugin Type = "io.containerd.nri.v1"
-	// TransferPlugin implements a transfer service
-	TransferPlugin Type = "io.containerd.transfer.v1"
-	// SandboxStorePlugin implements a sandbox store
-	SandboxStorePlugin Type = "io.containerd.sandbox.store.v1"
-	// SandboxControllerPlugin implements a sandbox controller
-	SandboxControllerPlugin Type = "io.containerd.sandbox.controller.v1"
-	// ImageVerifierPlugin implements an image verifier service
-	ImageVerifierPlugin Type = "io.containerd.image-verifier.v1"
-)
-
-const (
-	// RuntimeRuncV2 is the runc runtime that supports multiple containers per shim
-	RuntimeRuncV2 = "io.containerd.runc.v2"
-)
-
 // Registration contains information for registering a plugin
 type Registration struct {
 	// Type of the plugin

plugin_test.go

@@ -32,24 +32,39 @@ func mockPluginFilter(*Registration) bool {
 	return false
 }
 
-var tasksServiceRequires = []Type{
-	RuntimePlugin,
-	RuntimePluginV2,
-	MetadataPlugin,
-	TaskMonitorPlugin,
-}
-
 // TestContainerdPlugin tests the logic of Graph, use the containerd's plugin
 func TestContainerdPlugin(t *testing.T) {
 	registerClear()
+	// Plugin types commonly used by containerd
+	const (
+		InternalPlugin         Type = "io.containerd.internal.v1"
+		RuntimePlugin          Type = "io.containerd.runtime.v1"
+		RuntimePluginV2        Type = "io.containerd.runtime.v2"
+		ServicePlugin          Type = "io.containerd.service.v1"
+		GRPCPlugin             Type = "io.containerd.grpc.v1"
+		SnapshotPlugin         Type = "io.containerd.snapshotter.v1"
+		TaskMonitorPlugin      Type = "io.containerd.monitor.v1"
+		DiffPlugin             Type = "io.containerd.differ.v1"
+		MetadataPlugin         Type = "io.containerd.metadata.v1"
+		ContentPlugin          Type = "io.containerd.content.v1"
+		GCPlugin               Type = "io.containerd.gc.v1"
+		LeasePlugin            Type = "io.containerd.lease.v1"
+		TracingProcessorPlugin Type = "io.containerd.tracing.processor.v1"
+	)
+
 	Register(&Registration{
 		Type: TaskMonitorPlugin,
 		ID:   "cgroups",
 	})
 	Register(&Registration{
-		Type:     ServicePlugin,
-		ID:       services.TasksService,
-		Requires: tasksServiceRequires,
+		Type: ServicePlugin,
+		ID:   services.TasksService,
+		Requires: []Type{
+			RuntimePlugin,
+			RuntimePluginV2,
+			MetadataPlugin,
+			TaskMonitorPlugin,
+		},
 	})
 	Register(&Registration{
 		Type: ServicePlugin,