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>

plugins/types.go

@@ -0,0 +1,84 @@
+/*
+   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.
+*/
+
+// plugins package stores all the plugin types used by containerd internally.
+//
+// External plugins should copy from these types and avoid importing this
+// package.
+package plugins
+
+import "github.com/containerd/containerd/plugin"
+
+const (
+	// InternalPlugin implements an internal plugin to containerd
+	InternalPlugin plugin.Type = "io.containerd.internal.v1"
+	// RuntimePlugin implements a runtime
+	RuntimePlugin plugin.Type = "io.containerd.runtime.v1"
+	// RuntimePluginV2 implements a runtime v2
+	RuntimePluginV2 plugin.Type = "io.containerd.runtime.v2"
+	// ServicePlugin implements a internal service
+	ServicePlugin plugin.Type = "io.containerd.service.v1"
+	// GRPCPlugin implements a grpc service
+	GRPCPlugin plugin.Type = "io.containerd.grpc.v1"
+	// TTRPCPlugin implements a ttrpc shim service
+	TTRPCPlugin plugin.Type = "io.containerd.ttrpc.v1"
+	// SnapshotPlugin implements a snapshotter
+	SnapshotPlugin plugin.Type = "io.containerd.snapshotter.v1"
+	// TaskMonitorPlugin implements a task monitor
+	TaskMonitorPlugin plugin.Type = "io.containerd.monitor.v1"
+	// DiffPlugin implements a differ
+	DiffPlugin plugin.Type = "io.containerd.differ.v1"
+	// MetadataPlugin implements a metadata store
+	MetadataPlugin plugin.Type = "io.containerd.metadata.v1"
+	// ContentPlugin implements a content store
+	ContentPlugin plugin.Type = "io.containerd.content.v1"
+	// GCPlugin implements garbage collection policy
+	GCPlugin plugin.Type = "io.containerd.gc.v1"
+	// EventPlugin implements event handling
+	EventPlugin plugin.Type = "io.containerd.event.v1"
+	// LeasePlugin implements lease manager
+	LeasePlugin plugin.Type = "io.containerd.lease.v1"
+	// StreamingPlugin implements a stream manager
+	StreamingPlugin plugin.Type = "io.containerd.streaming.v1"
+	// TracingProcessorPlugin implements a open telemetry span processor
+	TracingProcessorPlugin plugin.Type = "io.containerd.tracing.processor.v1"
+	// NRIApiPlugin implements the NRI adaptation interface for containerd.
+	NRIApiPlugin plugin.Type = "io.containerd.nri.v1"
+	// TransferPlugin implements a transfer service
+	TransferPlugin plugin.Type = "io.containerd.transfer.v1"
+	// SandboxStorePlugin implements a sandbox store
+	SandboxStorePlugin plugin.Type = "io.containerd.sandbox.store.v1"
+	// SandboxControllerPlugin implements a sandbox controller
+	SandboxControllerPlugin plugin.Type = "io.containerd.sandbox.controller.v1"
+	// ImageVerifierPlugin implements an image verifier service
+	ImageVerifierPlugin plugin.Type = "io.containerd.image-verifier.v1"
+)
+
+const (
+	// RuntimeRuncV2 is the runc runtime that supports multiple containers per shim
+	RuntimeRuncV2 = "io.containerd.runc.v2"
+)
+
+const (
+	// PropertyRootDir sets the root directory property for a plugin
+	PropertyRootDir = "io.containerd.plugin.root"
+	// PropertyStateDir sets the state directory property for a plugin
+	PropertyStateDir = "io.containerd.plugin.state"
+	// PropertyGRPCAddress is the grpc address used for client connections to containerd
+	PropertyGRPCAddress = "io.containerd.plugin.grpc.address"
+	// PropertyGRPCAddress is the ttrpc address used for client connections to containerd
+	PropertyTTRPCAddress = "io.containerd.plugin.ttrpc.address"
+)