Fix system prune cmd user message with options

Signed-off-by: Jakub Guzik <jakubmguzik@gmail.com>

cmd/podman/system/prune.go

@@ -55,22 +55,17 @@ func init() {
 
 func prune(cmd *cobra.Command, args []string) error {
 	var err error
-
 	// Prompt for confirmation if --force is not set
 	if !force {
 		reader := bufio.NewReader(os.Stdin)
 		volumeString := ""
 		if pruneOptions.Volume {
 			volumeString = `
-        - all volumes not used by at least one container`
+	- all volumes not used by at least one container`
 		}
-		fmt.Printf(`
-WARNING! This will remove:
-        - all stopped containers%s
-        - all stopped pods
-        - all dangling images
-        - all build cache
-Are you sure you want to continue? [y/N] `, volumeString)
+
+		fmt.Printf(createPruneWarningMessage(pruneOptions), volumeString, "Are you sure you want to continue? [y/N] ")
+
 		answer, err := reader.ReadString('\n')
 		if err != nil {
 			return err
@@ -115,3 +110,22 @@ Are you sure you want to continue? [y/N] `, volumeString)
 	fmt.Printf("Total reclaimed space: %s\n", units.HumanSize((float64)(response.ReclaimedSpace)))
 	return nil
 }
+
+func createPruneWarningMessage(pruneOpts entities.SystemPruneOptions) string {
+	if pruneOpts.All {
+		return `WARNING! This will remove:
+	- all stopped containers
+	- all networks not used by at least one container%s
+	- all images without at least one container associated to them
+	- all build cache
+
+%s`
+	}
+	return `WARNING! This will remove:
+	- all stopped containers
+	- all networks not used by at least one container%s
+	- all dangling images
+	- all dangling build cache
+
+%s`
+}