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Diffstat (limited to 'nixos/modules/virtualisation/grow-partition.nix')
-rw-r--r-- | nixos/modules/virtualisation/grow-partition.nix | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/nixos/modules/virtualisation/grow-partition.nix b/nixos/modules/virtualisation/grow-partition.nix new file mode 100644 index 00000000000..34547905166 --- /dev/null +++ b/nixos/modules/virtualisation/grow-partition.nix @@ -0,0 +1,41 @@ +# 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, ... }: + +{ + + 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 $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 + ''; + + }; + +} |