export: add --skip-non-distributable

The flag skips adding non-distributable blobs such as Windows layers to archive.

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

cmd/ctr/commands/images/export.go

@@ -44,6 +44,10 @@ When '--all-platforms' is given all images in a manifest list must be available.
 			Name:  "skip-manifest-json",
 			Usage: "do not add Docker compatible manifest.json to archive",
 		},
+		cli.BoolFlag{
+			Name:  "skip-non-distributable",
+			Usage: "do not add non-distributable blobs such as Windows layers to archive",
+		},
 		cli.StringSliceFlag{
 			Name:  "platform",
 			Usage: "Pull content from a specific platform",
@@ -86,6 +90,10 @@ When '--all-platforms' is given all images in a manifest list must be available.
 			exportOpts = append(exportOpts, archive.WithSkipDockerManifest())
 		}
 
+		if context.Bool("skip-non-distributable") {
+			exportOpts = append(exportOpts, archive.WithSkipNonDistributableBlobs())
+		}
+
 		client, ctx, cancel, err := commands.NewClient(context)
 		if err != nil {
 			return err