[gPXE-devel] Minor Scripting Improvements

[Shao Miller]

J.H. wrote:
>
> (sorry to get back to this so late, just popping off the e-mail stack
> and this finally made it back to the top)
>
> What I need to do, or what would make a lot of sense to me is the 
> following:
>
> 1  : Load gPXE
> 10 : try dhcp
> 20 :    Chain to syslinux
> 20 :    Syslinux set a variable in gPXE
> 30 :    Syslinux exits
> 40 : if variable set - we successfully made it to syslinux - gPXE can exit
> 50 : if not variable set continue
> 60 : try static
> 70 :    Chain to syslinux
> 80 :    Syslinux set a variable in gPXE
> 90 :    Syslinux exits
> 100: if variable set - we successfully made it to syslinux - gPXE can exit
> 110: if not variable goto 10
>
> I *THINK* all I really need is to have some concept of an if statement,
> even if it was nothing but if 0|1 I.E.
>
> if variable <gpxe command> (or <gpxe command> if variable)
>

Stefan made a branch called "ifgoto" for this[1].  I also took a stab at 
it tonight[2] ripping off his 'if' and including 'exit', running 575 bytes.

> I just really need a simple mechanism to get a return code of some sort,
> using gpxecmd.c32 should work, if I use it as the default or a custom
> com32 module can be written that does what I need (just need to be able
> to set the variable in gPXE)
>
> I'm trying to think of a way to abuse the loopif construct suggested
> here to get what I'm looking for now too ;-) but that might be a bit
> more complicated.
>

Definitely more complicated, but likely doable. :S

> Anyway hopefully this is helpful in what I'm kinda looking for.
>

- Shao Miller

[1] 
http://git.etherboot.org/?p=people/stefanha/gpxe.git;a=shortlog;h=refs/heads/ifgoto
[2] 
http://git.etherboot.org/?p=people/sha0/gpxe.git;a=shortlog;h=refs/heads/exit_if_goto
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