Add kpod tag command

Add one or more tags to an image

Signed-off-by: Ryan Cole <rcyoalne@gmail.com>

cmd/kpod/common.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	is "github.com/containers/image/storage"
+	"github.com/containers/storage"
+	"github.com/pkg/errors"
+	"github.com/urfave/cli"
+)
+
+func getStore(c *cli.Context) (storage.Store, error) {
+	options := storage.DefaultStoreOptions
+	if c.GlobalIsSet("storage-driver") {
+		options.GraphDriverName = c.GlobalString("storage-driver")
+	}
+	if c.GlobalIsSet("storage-opt") {
+		opts := c.GlobalStringSlice("storage-opt")
+		if len(opts) > 0 {
+			options.GraphDriverOptions = opts
+		}
+	}
+	store, err := storage.GetStore(options)
+	if err != nil {
+		return nil, err
+	}
+	is.Transport.SetStore(store)
+	return store, nil
+}
+
+func findImage(store storage.Store, image string) (*storage.Image, error) {
+	var img *storage.Image
+	ref, err := is.Transport.ParseStoreReference(store, image)
+	if err == nil {
+		img, err = is.Transport.GetStoreImage(store, ref)
+	}
+	if err != nil {
+		img2, err2 := store.Image(image)
+		if err2 != nil {
+			if ref == nil {
+				return nil, errors.Wrapf(err, "error parsing reference to image %q", image)
+			}
+			return nil, errors.Wrapf(err, "unable to locate image %q", image)
+		}
+		img = img2
+	}
+	return img, nil
+
+}