pyrox.dev
1# This module automatically grows the root partition on virtual machines.
2# This allows an instance to be created with a bigger root filesystem
3# than provided by the machine image.
4
5{ config, lib, pkgs, ... }:
6
7with lib;
8
9{
10
11 options = {
12
13 virtualisation.growPartition = mkOption {
14 type = types.bool;
15 default = true;
16 };
17
18 };
19
20 config = mkIf config.virtualisation.growPartition {
21
22 boot.initrd.extraUtilsCommands = ''
23 copy_bin_and_libs ${pkgs.gawk}/bin/gawk
24 copy_bin_and_libs ${pkgs.gnused}/bin/sed
25 copy_bin_and_libs ${pkgs.utillinux}/sbin/sfdisk
26 copy_bin_and_libs ${pkgs.utillinux}/sbin/lsblk
27 cp -v ${pkgs.cloud-utils}/bin/growpart $out/bin/growpart
28 ln -s sed $out/bin/gnused
29 '';
30
31 boot.initrd.postDeviceCommands = ''
32 rootDevice="${config.fileSystems."/".device}"
33 if [ -e "$rootDevice" ]; then
34 rootDevice="$(readlink -f "$rootDevice")"
35 parentDevice="$(lsblk -npo PKNAME "$rootDevice")"
36 TMPDIR=/run sh $(type -P growpart) "$parentDevice" "''${rootDevice#$parentDevice}"
37 udevadm settle
38 fi
39 '';
40
41 };
42
43}