Add 'kpod images' and 'kpod rmi' commands

'kpod images' lists all images on a system.  'kpod rmi' removes
one or more images from a system.  The images will not be removed
if they are associated with a running container, unless the -f
option is used

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

cmd/kpod/common_test.go

@@ -1,21 +1,20 @@
 package main
 
 import (
+	"os/exec"
 	"os/user"
 	"testing"
 
 	"flag"
 
+	is "github.com/containers/image/storage"
+	"github.com/containers/storage"
 	"github.com/urfave/cli"
 )
 
 func TestGetStore(t *testing.T) {
-	u, err := user.Current()
-	if err != nil {
-		t.Log("Could not determine user.  Running as root may cause tests to fail")
-	} else if u.Uid != "0" {
-		t.Fatal("tests will fail unless run as root")
-	}
+	// Make sure the tests are running as root
+	failTestIfNotRoot(t)
 
 	set := flag.NewFlagSet("test", 0)
 	globalSet := flag.NewFlagSet("test", 0)
@@ -25,8 +24,72 @@ func TestGetStore(t *testing.T) {
 	c := cli.NewContext(nil, set, globalCtx)
 	c.Command = command
 
-	_, err = getStore(c)
+	_, err := getStore(c)
 	if err != nil {
 		t.Error(err)
 	}
 }
+
+func TestParseMetadata(t *testing.T) {
+	// Make sure the tests are running as root
+	failTestIfNotRoot(t)
+
+	store, err := storage.GetStore(storage.DefaultStoreOptions)
+	if err != nil {
+		t.Fatal(err)
+	} else if store != nil {
+		is.Transport.SetStore(store)
+	}
+
+	images, err := store.Images()
+	if err != nil {
+		t.Fatalf("Error reading images: %v", err)
+	} else if len(images) == 0 {
+		t.Fatalf("no images with metadata to parse")
+	}
+
+	_, err = parseMetadata(images[0])
+	if err != nil {
+		t.Error(err)
+	}
+}
+
+func TestGetSize(t *testing.T) {
+	// Make sure the tests are running as root
+	failTestIfNotRoot(t)
+
+	store, err := storage.GetStore(storage.DefaultStoreOptions)
+	if err != nil {
+		t.Fatal(err)
+	} else if store != nil {
+		is.Transport.SetStore(store)
+	}
+
+	images, err := store.Images()
+	if err != nil {
+		t.Fatalf("Error reading images: %v", err)
+	}
+
+	_, err = getSize(images[0], store)
+	if err != nil {
+		t.Error(err)
+	}
+}
+
+func failTestIfNotRoot(t *testing.T) {
+	u, err := user.Current()
+	if err != nil {
+		t.Log("Could not determine user.  Running without root may cause tests to fail")
+	} else if u.Uid != "0" {
+		t.Fatal("tests will fail unless run as root")
+	}
+}
+
+func pullTestImage(name string) error {
+	cmd := exec.Command("crioctl", "image", "pull", name)
+	err := cmd.Run()
+	if err != nil {
+		return err
+	}
+	return nil
+}