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/rmi_test.go

@@ -0,0 +1,145 @@
+package main
+
+import (
+	"strings"
+	"testing"
+
+	is "github.com/containers/image/storage"
+	"github.com/containers/storage"
+)
+
+func TestProperImageRefTrue(t *testing.T) {
+	// Pull an image so we know we have it
+	err := pullTestImage("busybox:latest")
+	if err != nil {
+		t.Fatalf("could not pull image to remove")
+	}
+	// This should match a url path
+	imgRef, err := properImageRef("docker://busybox:latest")
+	if err != nil {
+		t.Errorf("could not match image: %v", err)
+	} else if imgRef == nil {
+		t.Error("Returned nil Image Reference")
+	}
+}
+
+func TestProperImageRefFalse(t *testing.T) {
+	// Pull an image so we know we have it
+	err := pullTestImage("busybox:latest")
+	if err != nil {
+		t.Fatal("could not pull image to remove")
+	}
+	// This should match a url path
+	imgRef, _ := properImageRef("docker://:")
+	if imgRef != nil {
+		t.Error("should not have found an Image Reference")
+	}
+}
+
+func TestStorageImageRefTrue(t *testing.T) {
+	// Make sure the tests are running as root
+	failTestIfNotRoot(t)
+
+	options := storage.DefaultStoreOptions
+	store, err := storage.GetStore(options)
+	if store != nil {
+		is.Transport.SetStore(store)
+	}
+	if err != nil {
+		t.Fatalf("could not get store: %v", err)
+	}
+	// Pull an image so we know we have it
+	err = pullTestImage("busybox:latest")
+	if err != nil {
+		t.Fatalf("could not pull image to remove: %v", err)
+	}
+	imgRef, err := storageImageRef(store, "busybox")
+	if err != nil {
+		t.Errorf("could not match image: %v", err)
+	} else if imgRef == nil {
+		t.Error("Returned nil Image Reference")
+	}
+}
+
+func TestStorageImageRefFalse(t *testing.T) {
+	// Make sure the tests are running as root
+	failTestIfNotRoot(t)
+
+	options := storage.DefaultStoreOptions
+	store, err := storage.GetStore(options)
+	if store != nil {
+		is.Transport.SetStore(store)
+	}
+	if err != nil {
+		t.Fatalf("could not get store: %v", err)
+	}
+	// Pull an image so we know we have it
+	err = pullTestImage("busybox:latest")
+	if err != nil {
+		t.Fatalf("could not pull image to remove: %v", err)
+	}
+	imgRef, _ := storageImageRef(store, "")
+	if imgRef != nil {
+		t.Error("should not have found an Image Reference")
+	}
+}
+
+func TestStorageImageIDTrue(t *testing.T) {
+	// Make sure the tests are running as root
+	failTestIfNotRoot(t)
+
+	options := storage.DefaultStoreOptions
+	store, err := storage.GetStore(options)
+	if store != nil {
+		is.Transport.SetStore(store)
+	}
+	if err != nil {
+		t.Fatalf("could not get store: %v", err)
+	}
+	// Pull an image so we know we have it
+	err = pullTestImage("busybox:latest")
+	if err != nil {
+		t.Fatalf("could not pull image to remove: %v", err)
+	}
+	//Somehow I have to get the id of the image I just pulled
+	images, err := store.Images()
+	if err != nil {
+		t.Fatalf("Error reading images: %v", err)
+	}
+	id, err := captureOutputWithError(func() error {
+		return outputImages(images, "", store, nil, "busybox:latest", false, false, false, true)
+	})
+	if err != nil {
+		t.Fatalf("Error getting id of image: %v", err)
+	}
+	id = strings.TrimSpace(id)
+
+	imgRef, err := storageImageID(store, id)
+	if err != nil {
+		t.Errorf("could not match image: %v", err)
+	} else if imgRef == nil {
+		t.Error("Returned nil Image Reference")
+	}
+}
+
+func TestStorageImageIDFalse(t *testing.T) {
+	// Make sure the tests are running as root
+	failTestIfNotRoot(t)
+
+	options := storage.DefaultStoreOptions
+	store, err := storage.GetStore(options)
+	if store != nil {
+		is.Transport.SetStore(store)
+	}
+	if err != nil {
+		t.Fatalf("could not get store: %v", err)
+	}
+	// Pull an image so we know we have it
+
+	id := ""
+
+	imgRef, _ := storageImageID(store, id)
+	if imgRef != nil {
+		t.Error("should not have returned Image Reference")
+	}
+}