50 lines
1.5 KiB
Nix
50 lines
1.5 KiB
Nix
# This module automatically grows the root partition.
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# This allows an instance to be created with a bigger root filesystem
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# than provided by the machine image.
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{ config, lib, pkgs, ... }:
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with lib;
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{
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options = {
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boot.growPartition = mkEnableOption "grow the root partition on boot";
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};
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config = mkIf config.boot.growPartition {
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boot.initrd.extraUtilsCommands = ''
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copy_bin_and_libs ${pkgs.gawk}/bin/gawk
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copy_bin_and_libs ${pkgs.gnused}/bin/sed
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copy_bin_and_libs ${pkgs.utillinux}/sbin/sfdisk
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copy_bin_and_libs ${pkgs.utillinux}/sbin/lsblk
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substitute "${pkgs.cloud-utils}/bin/.growpart-wrapped" "$out/bin/growpart" \
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--replace "${pkgs.bash}/bin/sh" "/bin/sh" \
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--replace "awk" "gawk" \
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--replace "sed" "gnused"
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ln -s sed $out/bin/gnused
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'';
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boot.initrd.postDeviceCommands = ''
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rootDevice="${config.fileSystems."/".device}"
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if waitDevice "$rootDevice"; then
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rootDevice="$(readlink -f "$rootDevice")"
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parentDevice="$rootDevice"
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while [ "''${parentDevice%[0-9]}" != "''${parentDevice}" ]; do
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parentDevice="''${parentDevice%[0-9]}";
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done
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partNum="''${rootDevice#''${parentDevice}}"
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if [ "''${parentDevice%[0-9]p}" != "''${parentDevice}" ] && [ -b "''${parentDevice%p}" ]; then
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parentDevice="''${parentDevice%p}"
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fi
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TMPDIR=/run sh $(type -P growpart) "$parentDevice" "$partNum"
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udevadm settle
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fi
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'';
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};
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}
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