Comment 1 for bug 1432498

Discussed this with Shivanand just now, and I think the solution is to treat the combination of whole disk image, UEFI mode, and boot-instance-from-network as unsupported for the time being.

I'm copying the IRC log here for reference:

16:57:06 < stendulker> devananda: What do you suggest?
16:57:55 < devananda> besides fixing it? do you know why it's not working?
16:59:03 < stendulker> primarily there is syntax errors in the config file that gets generated.
16:59:22 < stendulker> then it tries to use chain.c32 which is valid only for BIOS
16:59:46 < devananda> stendulker: oh, right. UEFI support for chain loading is handled differently
17:00:01 < stendulker> if we were to use syslinux for UEFI, it does not support chainloding
17:00:19 < stendulker> thirdly elilo do not support chainloading itself
17:00:57 < stendulker> grub2 does have support for chainloading, but that is a different investigation
17:02:21 < devananda> stendulker: grub2 is also local and has to be invoked by UEFI, so really, we'd be unnecessarily layering a net boot on top of grub2 bootloader on top of UEFI.
17:02:40 < devananda> *has to be invoked by UEFI, in the case where you're booting via UEFI
17:02:57 < tiagogomes_> on the ssh_agent driver, when I run `validate-node` I get this error: "failed to validate deploy image info". Any clue about what is missing?
17:03:11 < devananda> stendulker: so if I understand correctly, UEFI actually has some support for chainloading natively, but we dont have a good mechanism to pass that in remotely right now
17:03:31 < stendulker> devananda: yes
17:03:40 < devananda> stendulker: you can provide support for UEFI boot of whole disk images (eg, for windows deployment) via iscsi_ilo driver. is there a need for the pxe_ilo driver to support this?
17:05:26 < stendulker> devananda: i think this feature never came from ilo driver team. It was implemeneted as a independent feature. Also this bug would apply to all pxe drivers.
17:06:25 < devananda> stendulker: it seems like a poor interaction between UEFI support, whole-disk-imaging, and PXE drivers (ie, requiring the instance to net-boot after provisioning)
17:07:18 < devananda> *and using a legacy network boot loader (eg, not UEFI's own network boot program)
17:07:37 < stendulker> devananda: i feel we should disable whole disk image support for pxe drivers in uefi boot mode
17:07:41 < devananda> stendulker: I'd suggest we add some error checking to the PXE driver and error early if this combination was requested
17:07:49 < devananda> stendulker: :)
17:08:22 < stendulker> devananda: ok. I will investigate and fix on these lines.
17:08:27 < devananda> stendulker: thanks much