[gPXE-devel] [PATCH] [script] Allow control over error handling

[Shao Miller]

Stefan Hajnoczi wrote:
>
> Will this patch work for nested script execution?
>

gPXE's current behaviour is to exit all scripts upon error.  Scripts 
developed by users might expect this behaviour and expect the regular 
fall-back mechanism.  Suppose 'autoboot' is implemented as a script some 
day or that the user uses some other top-level script which clears 
exit-on-error...  I would not want the behaviour of the lower-level 
scripts to mysteriously change without the user explicitly clearing 
exit-on-error in each script, so this patch requires one to clear the 
exit-on-error state in each script.

It might be the case that user B uses a gPXE obtained from user A, where 
user B does not know user A's embedded script, but expects classic gPXE 
exit-on-error behaviour.  I'm thinking particularly about any services 
that offer custom gPXEs, such as Boot.Kernel.Org or NetBoot.Me.  
Someone, somewhere, could potentially be middle-manning BKO by using 
another gPXE script as "pxelinux.0".  Since BKO would likely use this 
feature, that person's middle-man script will continue to function with 
the classic behaviour.

It's certainly open to opinions, since it's easy to implement either 
way.  What do you think? :)

- Shao Miller
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