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nixos/grow-partition: Resize partition online instead of in initrd

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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
This commit is contained in:
Arian van Putten 2023-10-16 11:57:34 +00:00
parent ca012a02bf
commit 80a578580f
1 changed files with 24 additions and 28 deletions
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52
nixos/modules/system/boot/grow-partition.nix
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@ -16,29 +16,28 @@ with lib;
};
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";
};
assertions = [{
assertion = !config.boot.initrd.systemd.enable;
message = "systemd stage 1 does not support 'boot.growPartition' yet.";
}];
boot.initrd.extraUtilsCommands = ''
copy_bin_and_libs ${pkgs.gawk}/bin/gawk
copy_bin_and_libs ${pkgs.gnused}/bin/sed
copy_bin_and_libs ${pkgs.util-linux}/sbin/sfdisk
copy_bin_and_libs ${pkgs.util-linux}/sbin/lsblk
substitute "${pkgs.cloud-utils.guest}/bin/.growpart-wrapped" "$out/bin/growpart" \
--replace "${pkgs.bash}/bin/sh" "/bin/sh" \
--replace "awk" "gawk" \
--replace "sed" "gnused"
ln -s sed $out/bin/gnused
'';
boot.initrd.postDeviceCommands = ''
rootDevice="${config.fileSystems."/".device}"
if waitDevice "$rootDevice"; then
script = ''
rootDevice="${config.fileSystems."/".device}"
rootDevice="$(readlink -f "$rootDevice")"
parentDevice="$rootDevice"
while [ "''${parentDevice%[0-9]}" != "''${parentDevice}" ]; do
@ -48,11 +47,8 @@ with lib;
if [ "''${parentDevice%[0-9]p}" != "''${parentDevice}" ] && [ -b "''${parentDevice%p}" ]; then
parentDevice="''${parentDevice%p}"
fi
TMPDIR=/run sh $(type -P growpart) "$parentDevice" "$partNum"
udevadm settle
fi
'';
"${pkgs.cloud-utils.guest}/bin/growpart" "$parentDevice" "$partNum"
'';
};
};
}