[gPXE] clear script_errors option

[Pete Batard]

Hi,

I'm currently trying to automate an iSCSI boot that would fallback to a 
WinPE environment image, in case the iSCSI disk is not bootable.

This is the script I have been trying to use with my PXE image as a 
result (NB: yes, I know I'm not using a proper iqn for the ISCSI target):

#!gpxe
dhcp net0
set keep-san 1
sanboot iscsi:192.168.1.1:::1:myserver:disk1
chain tftp://192.168.1.1/Boot/startrom.n12

When entered manually, this sequence of command works fine and, if the 
iSCSI fails to boot, WinPE is launched (through startrom.n12). This is 
extremely convenient, for instance, to install Windows onto a new iSCSI 
disk.

Now, the problem is that, when not executed interactively, the default 
for gPXE scripts is to halt on failure. So, if the sanboot command 
fails, the chain command is never executed and the WinPE image is never 
launched.

Obviously then, I would like an option to allow a gPXE script to 
continue on error.

Having found out about a similar request [1] and the "clear 
script_errors" implementation [2], I tried to that option in my script, 
but it doesn't appear to work.

So my question is: has the "clear script_errors" ever been committed? 
And if not, could you please add it to a future release?

Regards,

/Pete


[1] http://www.mail-archive.com/gpxe@etherboot.org/msg00685.html
[2] 
http://git.etherboot.org/?p=people/sha0/gpxe.git;a=commitdiff;h=79bcbbe5c07cb60ee8b240ec0ffff6448f3c42c5