Streamline image resolution

When trying to determine if a user-provided string that describes
an image (ID, fq name, shortname, tagged), there were some
inefficiencies where we looked up images multiple times to derive
information about local images.

Signed-off-by: baude <bbaude@redhat.com>

cmd/podman/create.go

@@ -370,10 +370,13 @@ func exposedPorts(c *cli.Context, imageExposedPorts map[string]struct{}) (map[na
 // default container runtime data out of it. imageData returns the data
 // to the caller.  Example Data: Entrypoint, Env, WorkingDir, Labels ...
 func imageData(c *cli.Context, runtime *libpod.Runtime, image string) (string, string, *libpod.ImageData, error) {
-	var err error
+	var (
+		err                error
+		imageName, imageID string
+	)
 	// Deal with the image after all the args have been checked
 	createImage := runtime.NewImage(image)
-	createImage.LocalName, _ = createImage.GetLocalImageName()
+	imageName, imageID, _ = createImage.GetLocalImageName()
 	if createImage.LocalName == "" {
 		// The image wasnt found by the user input'd name or its fqname
 		// Pull the image
@@ -384,31 +387,14 @@ func imageData(c *cli.Context, runtime *libpod.Runtime, image string) (string, s
 		createImage.Pull(writer)
 	}
 
-	var imageName string
-	if createImage.LocalName != "" {
-		nameIsID, err := runtime.IsImageID(createImage.LocalName)
-		if err != nil {
-			return "", "", nil, err
-		}
-		if nameIsID {
-			// If the input from the user is an ID, then we need to get the image
-			// name for cstorage
-			createImage.LocalName, err = createImage.GetNameByID()
-			if err != nil {
-				return "", "", nil, err
-			}
-		}
-		imageName = createImage.LocalName
-	} else {
+	createImage.LocalName = imageName
+	if imageName == "" {
 		imageName, err = createImage.GetFQName()
+		_, imageID, _ = createImage.GetLocalImageName()
 	}
 	if err != nil {
 		return "", "", nil, err
 	}
-	imageID, err := createImage.GetImageID()
-	if err != nil {
-		return "", "", nil, err
-	}
 	storageImage, err := runtime.GetImage(imageName)
 	if err != nil {
 		return "", "", nil, errors.Wrapf(err, "error getting storage image %q", image)

libpod/runtime_img.go

@@ -342,27 +342,23 @@ func getTags(nameInput string) (reference.NamedTagged, bool, error) {
 	return tagged, isTagged, nil
 }
 
-// GetLocalImageName returns  the name of the image if it is local.
-// It will return an empty string and error if not found.
-func (k *Image) GetLocalImageName() (string, error) {
-	_, err := k.runtime.GetImage(k.Name)
+// GetLocalImageName returns  the name of the image if it is local as well
+// as the image's ID. It will return an empty strings and error if not found.
+func (k *Image) GetLocalImageName() (string, string, error) {
+	localImage, err := k.runtime.GetImage(k.Name)
 	if err == nil {
 		k.LocalName = k.Name
-		return k.Name, nil
+		return k.Name, localImage.ID, nil
 	}
 	localImages, err := k.runtime.GetImages(&ImageFilterParams{})
 	if err != nil {
-		return "", errors.Wrapf(err, "unable to find local images")
+		return "", "", errors.Wrapf(err, "unable to find local images")
 	}
 	_, isTagged, err := getTags(k.Name)
 	if err != nil {
-		return "", err
+		return "", "", err
 	}
 	for _, image := range localImages {
-		if strings.HasPrefix(image.ID, k.Name) {
-			k.ID = image.ID
-			return image.ID, nil
-		}
 		for _, name := range image.Names {
 			imgRef, err := reference.Parse(name)
 			if err != nil {
@@ -382,22 +378,22 @@ func (k *Image) GetLocalImageName() (string, error) {
 
 			if imageName == k.Name {
 				k.LocalName = name
-				return name, nil
+				return name, image.ID, nil
 			}
 			imageSplit := strings.Split(imageName, "/")
 			baseName := imageSplit[len(imageSplit)-1]
 			if baseName == k.Name {
 				k.LocalName = name
-				return name, nil
+				return name, image.ID, nil
 			}
 		}
 	}
-	return "", errors.Wrapf(storage.ErrImageUnknown, "unable to find image locally")
+	return "", "", errors.Wrapf(storage.ErrImageUnknown, "unable to find image locally")
 }
 
 // HasLatest determines if we have the latest image local
 func (k *Image) HasLatest() (bool, error) {
-	localName, err := k.GetLocalImageName()
+	localName, _, err := k.GetLocalImageName()
 	if err != nil {
 		return false, err
 	}
@@ -434,7 +430,7 @@ func (k *Image) Pull(writer io.Writer) error {
 func (k *Image) Remove(force bool) (string, error) {
 	if k.LocalName == "" {
 		// This populates the images local name
-		_, err := k.GetLocalImageName()
+		_, _, err := k.GetLocalImageName()
 		if err != nil {
 			return "", errors.Wrapf(err, "unable to find %s locally", k.Name)
 		}