Setting btrfs as the default file system for OpenStack images

[ghost]

Sorry for not following the issue template, but this isn't a bug and also not really a new package request.

I was wondering if it is possible to support btrfs when generating an OpenStack image. Currently, ext4 is hard-coded in nixpkgs/nixos/modules/virtualisation/openstack-config.nix, which isn't ideal for my use-case. I currently solve it by maintaining a fork of the repository, but this is far from ideal. Could this be changed, or is there a better way to tackle this issue?

Love the project, by the way!

[ghost]

I've done some digging, and it seems this requires auto-growing the btrfs file system at boot-time. I went ahead and added some changes that make this possible. I'll open up a pull request when it passes some tests.

[stale]

I marked this as stale due to inactivity. → More info