55 lines
1.8 KiB
Nix
55 lines
1.8 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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imports = [
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(mkRenamedOptionModule [ "virtualisation" "growPartition" ] [ "boot" "growPartition" ])
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];
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options = {
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boot.growPartition = mkEnableOption (lib.mdDoc "growing the root partition on boot");
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};
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config = mkIf config.boot.growPartition {
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assertions = [
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{
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assertion = !config.boot.initrd.systemd.repart.enable && !config.systemd.repart.enable;
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message = "systemd-repart already grows the root partition and thus you should not use boot.growPartition";
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}
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];
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systemd.services.growpart = {
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wantedBy = [ "-.mount" ];
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after = [ "-.mount" ];
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before = [ "systemd-growfs-root.service" "shutdown.target" ];
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conflicts = [ "shutdown.target" ];
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unitConfig.DefaultDependencies = false;
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serviceConfig = {
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Type = "oneshot";
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RemainAfterExit = true;
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TimeoutSec = "infinity";
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# growpart returns 1 if the partition is already grown
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SuccessExitStatus = "0 1";
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};
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script = ''
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rootDevice="${config.fileSystems."/".device}"
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rootDevice="$(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="''${parentDevice%p}"
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fi
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"${pkgs.cloud-utils.guest}/bin/growpart" "$parentDevice" "$partNum"
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'';
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};
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};
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}
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