[syslinux] CONFIG

[H. Peter Anvin]

Ferenc Wagner wrote:
> 
> This may or may not be related, but some time ago we talked about
> optionally changing the current directory when a new config file is
> loaded.  Unfortunately I failed to implement this.  However, recently
> there was some activity around this part of the code.  What do you
> think about adding the possibility of something like
> 
>   LABEL config
>     CONFIG /some/dir/newconfig.cfg
>     APPEND cwd
> 
> to the effect of setting the current directory to /some/dir, as if
> newconfig.cfg was read by the loader initially?  This would help a lot
> integrating several isolinux-booted systems into one CD or USB stick.

I have been thinking about it a lot, but there is a major complication 
which I haven't had time to come up with a workaround for.  The 
fundamental problem is that the configuration file needs to be 
accessible from the new namespace, but it was looked up in the old 
namespace.  This would require either keeping the full pathname of the 
current directory at all times (which pxelinux does, but not any of the 
other derivatives) and canonicalize the configuration file name, or come 
up with some kind of "magic shortcut" syntax.

	-hpa