diff options
Diffstat (limited to 'nixos/modules/system/boot/grow-partition.nix')
-rw-r--r-- | nixos/modules/system/boot/grow-partition.nix | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/nixos/modules/system/boot/grow-partition.nix b/nixos/modules/system/boot/grow-partition.nix new file mode 100644 index 00000000000..87c981b24ce --- /dev/null +++ b/nixos/modules/system/boot/grow-partition.nix @@ -0,0 +1,53 @@ +# This module automatically grows the root partition. +# This allows an instance to be created with a bigger root filesystem +# than provided by the machine image. + +{ config, lib, pkgs, ... }: + +with lib; + +{ + imports = [ + (mkRenamedOptionModule [ "virtualisation" "growPartition" ] [ "boot" "growPartition" ]) + ]; + + options = { + boot.growPartition = mkEnableOption "grow the root partition on boot"; + }; + + config = mkIf config.boot.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.util-linux}/sbin/sfdisk + copy_bin_and_libs ${pkgs.util-linux}/sbin/lsblk + + substitute "${pkgs.cloud-utils.guest}/bin/.growpart-wrapped" "$out/bin/growpart" \ + --replace "${pkgs.bash}/bin/sh" "/bin/sh" \ + --replace "awk" "gawk" \ + --replace "sed" "gnused" + + ln -s sed $out/bin/gnused + ''; + + boot.initrd.postDeviceCommands = '' + rootDevice="${config.fileSystems."/".device}" + if waitDevice "$rootDevice"; then + rootDevice="$(readlink -f "$rootDevice")" + parentDevice="$rootDevice" + while [ "''${parentDevice%[0-9]}" != "''${parentDevice}" ]; do + parentDevice="''${parentDevice%[0-9]}"; + done + partNum="''${rootDevice#''${parentDevice}}" + if [ "''${parentDevice%[0-9]p}" != "''${parentDevice}" ] && [ -b "''${parentDevice%p}" ]; then + parentDevice="''${parentDevice%p}" + fi + TMPDIR=/run sh $(type -P growpart) "$parentDevice" "$partNum" + udevadm settle + fi + ''; + + }; + +} |