[syslinux] DEFAULT versus UI

[H. Peter Anvin]

On 08/28/2010 04:32 AM, Gene Cumm wrote:
> I'm posting this as I'm trying to evaluate DEFAULT versus UI.
> 
> As it stands right now, the use of the UI directive means that DEFAULT
> is effectively ignored from the command line.  If you specify UI and
> DEFAULT and use (vesa)menu.c32, (vesa)menu.c32 will use DEFAULT unless
> a MENU DEFAULT option exist in the current context.  If the attempt to
> execute a command fails, returning you to the "boot: " prompt, hitting
> enter will return you to the menu (assuming you haven't switched
> configs).  If your specified UI does not exist, hitting enter will
> again attempt to load the UI (probably unsuccessfully unless it's
> PXELINUX and you encountered an error that won't repeat on a
> particular retry).
> 
> If you've specified UI and DEFAULT but the UI file can not be found or
> otherwise loaded from media completely, I think it would be more
> advantageous to the user to return an error stating (probably in
> addition to the existing output) "UI could not be loaded" and then
> hitting enter at "boot: " would activate DEFAULT rather than failing
> again on UI.  Alternatively, it could again attempt to load UI but on
> failure, run DEFAULT.  However, if loading UI was successful, hitting
> enter from the "boot: " prompt should return to the menu.
> 
> Thoughts/comments?
> 
> HPA, I'm interested in working on this if there's interest.
> 

Sounds reasonable to me.

	-hpa