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