Pinned image support

Signed-off-by: Aditi Sharma <adi.sky17@gmail.com>

pkg/cri/labels/labels.go

@@ -0,0 +1,30 @@
+/*
+   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 labels
+
+const (
+	// criContainerdPrefix is common prefix for cri-containerd
+	criContainerdPrefix = "io.cri-containerd"
+	// ImageLabelKey is the label key indicating the image is managed by cri plugin.
+	ImageLabelKey = criContainerdPrefix + ".image"
+	// ImageLabelValue is the label value indicating the image is managed by cri plugin.
+	ImageLabelValue = "managed"
+	// PinnedImageLabelKey is the label value indicating the image is pinned.
+	PinnedImageLabelKey = criContainerdPrefix + ".pinned"
+	// PinnedImageLabelValue is the label value indicating the image is pinned.
+	PinnedImageLabelValue = "pinned"
+)