[ipxe-devel] Script embedding in EFI environment

[Hummel Frank]

I do that via DHCP server configuration.
Legacy (Syslinux) and IPXE clients use different user-classes.
Legacy and UEFI use different architectures.
As IPXE initiates a new DHCP request you have to break the boot-loop by detecting the iPXE user-class

Shortened code snippet from my dhcpd.conf:
*.ipxe files are the scripts for iPXE.
No scripts embedded in ipxe.lkrn
-----------------------------------------------------------------

	    filename "/pxelinux.0"; 		# user selects in Syslinux menu "default" to continue in Syslinux mode or chain to iPXE via
						#     KERNEL ipxe/ipxe.lkrn
						# 	APPEND dhcp && chain http://111.222.333.444/ipxe/boot.ipxe
		if exists user-class {
		    if option user-class = "iPXE" {
# legacy menu ipxe
		    filename "http://111.222.333.444/boot.ipxe"; 
						}
				    }
# UEFI menu ipxe
		 if option arch = 00:07 {
				if exists user-class {
				if option user-class = "iPXE" {
					filename "/ipxe/efi/bootefi.ipxe";
								}
						    }
				        }


mit freundlichen Grüßen
with kind regards

i. A. Dipl.Ing. (FH) Frank Hummel
Systementwicklung
System development

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72622 Nürtingen
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Tel.:    +49 7022 2522-2412
Fax:    +49 7022 2522-400
E-Mail: F.Hummel at ads-tec.de
Web: www.ads-tec.de

-----Ursprüngliche Nachricht-----
Von: ipxe-devel-bounces at lists.ipxe.org [mailto:ipxe-devel-bounces at lists.ipxe.org] Im Auftrag von Martin Habets
Gesendet: Freitag, 2. Dezember 2016 10:28
An: ipxe-devel at lists.ipxe.org
Betreff: Re: [ipxe-devel] Script embedding in EFI environment

Maybe you could use DHCP option 209?
https://tools.ietf.org/html/rfc5071#section-4

Martin

On 01/12/16 15:49, Lukas Zapletal wrote:
> Hello,
>
> our project (www.theforeman.org <http://www.theforeman.org>) provides functionality to generate bootdisk for individual hosts. These are either iPXE or SYSLINUX based. The iPXE version does load the kernel/initramdisk directly via HTTP, the SYSLINUX has embedded linux kernel.
>
> Now, we had no UEFI support, until now. I am able to implement SYSLINUX bootdisk type (we call it Full host image) with Grub2 and that was pretty simple.
>
> I would like to add ipxe.efi into the image and be able to boot it, which is also doable either directly, or via chainbooting from Grub2. But the problem is, with SYSLINUX we've been able to provide the script via initramdisk (it's call embedding in iPXE terms I believe):
>
> default ipxe
> label ipxe
> kernel /ipxe
> initrd /script
>
> This worked fine, but I am unable to do the same with ipxe.efi.
>
> set default=0
> set timeout=1
> menuentry "Chainload iPXE - this does not work" {
>   linuxefi /ipxe.efi
>   initrdefi /script
> }
> menuentry "Chainload iPXE - this loads iPXE but no script" {
>   search --no-floppy --set=root -f /ipxe.efi
>   chainloader /ipxe.efi + 1
> }
>
> Is there a way to embed a script? What I want to avoid is building iPXE from scratch (with embedded script), I don't want to make our application complex and compiler and tools are not usually available on production installations.
>
> If there is no way of doing that from Grub2, I am fine booting iPXE directly, that's just more work when generating the ISO (hybrid) image for me, but feasible too.
>
> Tried to post into the user forum, but it did not work (form was submitted but no post appeared). Later on, I saw a PostgreSQL error page, so sending to the dev list if you don't mind. Thanks for help!
>
> --
> S pozdravem / Best regards
>   Lukas Zapletal
>
>
> _______________________________________________
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> ipxe-devel at lists.ipxe.org
> https://lists.ipxe.org/mailman/listinfo.cgi/ipxe-devel
>
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