There is no way to customize the installation of the bootloader

[Mathieu Gagné]

There is currently no way to customize the installation of the bootloader.

The installation, configuration, rebuild of configuration and hacks to the configuration are all done in elements/vm/finalise.d/51-bootloader

This means there is no room for a user to customize the bootloader configuration.

Some use cases:

1) I wish to disable the os-prober with "GRUB_DISABLE_OS_PROBER".

While I could configure "GRUB_DISABLE_OS_PROBER" before 51-bootloader in my own element, I would have to make sure grub is installed and copy most of the platform detection logic found in 51-bootloader.

I could also do it in an element after 51-bootloader but I:
- would lose all "hacks" done by 51-bootloader such as replacing "root=UUID=" for "root=LABEL=".
- would have to reimplement all the detection logic around the grub-update binary (GRUB_MKCONFIG).

2) I wish to change the console from tty0 to tty1

This part is just harcoded. Any solution would have the same downsides as use case #1.

[Matthew Thode (prometheanfire)]

this is the only command I want it to run...

    grub2-install "${BLOCK_DEV}" --root-directory "${MOUNT_DIR}"

[Matthew Thode (prometheanfire)]

I feel like DIB is not written with the best modularity in mind.

[Clint Byrum (clint-fewbar)]

Matthew, that's almost 100% opposite of the point of diskimage-builder existing. We love modularity, and would love to have a patch that enabled customization of the boot loader installation arguments. Please clone https://git.openstack.org/openstack/diskimage-builder.git and then use this process to submit a patch:

http://docs.openstack.org/infra/manual/developers.html

You can ping us on IRC if you need realtime existence. We're on Freenode in #tripleo