Move oci to pkg/oci

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

pkg/oci/client.go

@@ -0,0 +1,38 @@
+/*
+   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 oci
+
+import (
+	"context"
+
+	"github.com/containerd/containerd/v2/core/content"
+	"github.com/containerd/containerd/v2/core/snapshots"
+	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
+)
+
+// Client interface used by SpecOpt
+type Client interface {
+	SnapshotService(snapshotterName string) snapshots.Snapshotter
+}
+
+// Image interface used by some SpecOpt to query image configuration
+type Image interface {
+	// Config descriptor for the image.
+	Config(ctx context.Context) (ocispec.Descriptor, error)
+	// ContentStore provides a content store which contains image blob data
+	ContentStore() content.Store
+}