refactor(native): separate init from implementation

Part of #4513

Signed-off-by: Jian Zeng <anonymousknight96@gmail.com>

cmd/containerd/builtins_linux.go

@@ -22,6 +22,6 @@ import (
 	_ "github.com/containerd/containerd/runtime/v1/linux"
 	_ "github.com/containerd/containerd/runtime/v2"
 	_ "github.com/containerd/containerd/runtime/v2/runc/options"
-	_ "github.com/containerd/containerd/snapshots/native"
+	_ "github.com/containerd/containerd/snapshots/native/plugin"
 	_ "github.com/containerd/containerd/snapshots/overlay/plugin"
 )

cmd/containerd/builtins_unix.go

@@ -19,5 +19,5 @@
 package main
 
 import (
-	_ "github.com/containerd/containerd/snapshots/native"
+	_ "github.com/containerd/containerd/snapshots/native/plugin"
 )

snapshots/native/native.go

@@ -24,8 +24,6 @@ import (
 
 	"github.com/containerd/containerd/log"
 	"github.com/containerd/containerd/mount"
-	"github.com/containerd/containerd/platforms"
-	"github.com/containerd/containerd/plugin"
 	"github.com/containerd/containerd/snapshots"
 	"github.com/containerd/containerd/snapshots/storage"
 
@@ -33,17 +31,6 @@ import (
 	"github.com/pkg/errors"
 )
 
-func init() {
-	plugin.Register(&plugin.Registration{
-		Type: plugin.SnapshotPlugin,
-		ID:   "native",
-		InitFn: func(ic *plugin.InitContext) (interface{}, error) {
-			ic.Meta.Platforms = append(ic.Meta.Platforms, platforms.DefaultSpec())
-			return NewSnapshotter(ic.Root)
-		},
-	})
-}
-
 type snapshotter struct {
 	root string
 	ms   *storage.MetaStore