Show unknown image for workload in list-images

Before this change the comparison to list an image as being used by the
workload was purely based upon the tag name. We now also check if the
digest of the image matches the one in our image cache.

In addition, if we are unable to match the image of the workload to a
tag and digest in our image cache, we still list the name of the tag
(as we have no other data available), but with a question mark added
as a prefix ('?->').

cmd/fluxctl/list_images_cmd.go

@@ -98,6 +98,9 @@ func (opts *imageListOpts) RunE(cmd *cobra.Command, args []string) error {
 			if reg != "" {
 				reg += "/"
 			}
+			if currentTag == "" {
+				currentTag = "latest"
+			}
 			if len(container.Available) == 0 {
 				availableErr := container.AvailableError
 				if availableErr == "" {
@@ -111,9 +114,9 @@ func (opts *imageListOpts) RunE(cmd *cobra.Command, args []string) error {
 			for _, available := range container.Available {
 				running := "|  "
 				_, _, tag := available.ID.Components()
-				if currentTag == tag {
-					running = "'->"
-					foundRunning = true
+				if currentTag == tag && available.Digest == container.Current.Digest {
+						running = "'->"
+						foundRunning = true
 				} else if foundRunning {
 					running = "   "
 				}
@@ -122,7 +125,7 @@ func (opts *imageListOpts) RunE(cmd *cobra.Command, args []string) error {
 				var printEllipsis, printLine bool
 				if opts.limit <= 0 || lineCount <= opts.limit {
 					printEllipsis, printLine = false, true
-				} else if container.Current.ID == available.ID {
+				} else if currentTag == tag && available.Digest == container.Current.Digest  {
 					printEllipsis, printLine = lineCount > (opts.limit+1), true
 				}
 				if printEllipsis {
@@ -136,6 +139,11 @@ func (opts *imageListOpts) RunE(cmd *cobra.Command, args []string) error {
 					fmt.Fprintf(out, "\t\t%s %s\t%s\n", running, tag, createdAt)
 				}
 			}
+			if !foundRunning {
+				running := "?->"
+				fmt.Fprintf(out, "\t\t%s %s\t\t\n", running, currentTag)
+
+			}
 			workloadName = ""
 		}
 	}