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80a578580f
There's no reason to do this in initrd. Partitions can be resized online. We just have to make sure it happens before we resize the file system. This also makes grow-partition work with systemd-initrd
54 lines
1.7 KiB
Nix
54 lines
1.7 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 "grow 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" ];
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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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