Temporary Change of Boot Sequence of Guests

[Samveen]

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[samveen@bmc ~]$ VBoxManage --version
5.0.8r103449

I need to do OS re-provisioning on a large number of guests in an automated manner via netboot (and do this repeatedly over time). My process:

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VBoxManage controlvm spare10 poweroff
VBoxManage modifyvm spare10 --boot1 net
VBoxManage startvm --type headless spare10
<--OS install via netboot/kickstart -->
<--Stuck in Netboot/OS install Loop -->

This is where my problems start. Once the kickstart process finishes, and the VM reboots, the whole netboot/kickstart cycle starts again.

So, I was wondering if there is any way to change the boot sequence of a VM TEMPORARILY, for JUST NEXT BOOT and reset back to old boot sequence automatically, 2nd power cycle onward.

Something like this:

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VBoxManage controlvm spare10 poweroff
VBoxManage modifyvm spare10 --boot1 disk
VBoxManage modifyvm spare10 --nextboot net
VBoxManage startvm --type headless spare10
<--OS install via netboot -->
# Nothing to do as we're done

Someone asked a similar question in /viewtopic.php?f=1&t=41833 . I dont want to control anything from inside the guest, as I'm running commands on the VirtualBox host. VBoxManage help[\i] was no help, and Google is giving me nothing useful.

Any help/pointers would be greatly appreciated.