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# This module automatically grows the root partition on virtual machines.
# This allows an instance to be created with a bigger root filesystem
# than provided by the machine image.
{ config, lib, pkgs, ... }:
with lib;
{
options = {
virtualisation.growPartition = mkOption {
type = types.bool;
default = true;
};
};
config = mkIf config.virtualisation.growPartition {
boot.initrd.extraUtilsCommands = ''
copy_bin_and_libs ${pkgs.gawk}/bin/gawk
copy_bin_and_libs ${pkgs.gnused}/bin/sed
copy_bin_and_libs ${pkgs.utillinux}/sbin/sfdisk
copy_bin_and_libs ${pkgs.utillinux}/sbin/lsblk
cp -v ${pkgs.cloud-utils}/bin/.growpart-wrapped $out/bin/growpart
ln -s sed $out/bin/gnused
'';
boot.initrd.postDeviceCommands = ''
rootDevice="${config.fileSystems."/".device}"
if [ -e "$rootDevice" ]; then
rootDevice="$(readlink -f "$rootDevice")"
parentDevice="$(lsblk -npo PKNAME "$rootDevice")"
TMPDIR=/run sh $(type -P growpart) "$parentDevice" "''${rootDevice#$parentDevice}"
udevadm settle
fi
'';
};
}
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