Support specifying osversion in the --platform flag

cmd/crane/cmd/root.go

@@ -39,7 +39,6 @@ func New(use, short string, options []crane.Option) *cobra.Command {
 	verbose := false
 	insecure := false
 	platform := &platformValue{}
-	var osVersion string
 
 	root := &cobra.Command{
 		Use:               use,
@@ -64,10 +63,6 @@ func New(use, short string, options []crane.Option) *cobra.Command {
 				options = append(options, crane.WithUserAgent(fmt.Sprintf("%s/%s", binary, Version)))
 			}
 
-			if osVersion != "" {
-				platform.platform.OSVersion = osVersion
-			}
-
 			options = append(options, crane.WithPlatform(platform.platform))
 
 			transport := remote.DefaultTransport.Clone()
@@ -118,8 +113,7 @@ func New(use, short string, options []crane.Option) *cobra.Command {
 
 	root.PersistentFlags().BoolVarP(&verbose, "verbose", "v", false, "Enable debug logs")
 	root.PersistentFlags().BoolVar(&insecure, "insecure", false, "Allow image references to be fetched without TLS")
-	root.PersistentFlags().Var(platform, "platform", "Specifies the platform in the form os/arch[/variant] (e.g. linux/amd64).")
-	root.PersistentFlags().StringVar(&osVersion, "osversion", "", "Specifies the OS version.")
+	root.PersistentFlags().Var(platform, "platform", "Specifies the platform in the form os/arch[/variant][:osversion] (e.g. linux/amd64).")
 
 	return root
 }

cmd/crane/cmd/util.go

@@ -48,7 +48,13 @@ func parsePlatform(platform string) (*v1.Platform, error) {
 	}
 
 	p := &v1.Platform{}
-	parts := strings.Split(platform, "/")
+
+	parts := strings.SplitN(platform, ":", 2)
+	if len(parts) == 2 {
+		p.OSVersion = parts[1]
+	}
+
+	parts = strings.Split(parts[0], "/")
 
 	if len(parts) < 2 {
 		return nil, fmt.Errorf("failed to parse platform '%s': expected format os/arch[/variant]", platform)