nixpkgs/nixos/modules/tasks/filesystems/zfs.nix

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{ config, pkgs, ... }:
#
# todo:
# - crontab for scrubs, etc
# - zfs tunables
# - /etc/zfs/zpool.cache handling
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with pkgs.lib;
let
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cfgSpl = config.boot.spl;
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inInitrd = any (fs: fs == "zfs") config.boot.initrd.supportedFilesystems;
inSystem = any (fs: fs == "zfs") config.boot.supportedFilesystems;
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kernel = config.boot.kernelPackages;
in
{
###### interface
options = {
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boot.spl.hostid = mkOption {
default = "";
example = "0xdeadbeef";
description = ''
ZFS uses a system's hostid to determine if a storage pool (zpool) is
native to this system, and should thus be imported automatically.
Unfortunately, this hostid can change under linux from boot to boot (by
changing network adapters, for instance). Specify a unique 32 bit hostid in
hex here for zfs to prevent getting a random hostid between boots and having to
manually import pools.
'';
};
};
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###### implementation
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config = mkIf ( inInitrd || inSystem ) {
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boot = {
kernelModules = [ "spl" "zfs" ] ;
extraModulePackages = [ kernel.zfs kernel.spl ];
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extraModprobeConfig = mkIf (cfgSpl.hostid != "") ''
options spl spl_hostid=${cfgSpl.hostid}
'';
};
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boot.initrd = mkIf inInitrd {
kernelModules = [ "spl" "zfs" ] ;
extraUtilsCommands =
''
cp -v ${kernel.zfs}/sbin/zfs $out/bin
cp -v ${kernel.zfs}/sbin/zdb $out/bin
cp -v ${kernel.zfs}/sbin/zpool $out/bin
cp -pdv ${kernel.zfs}/lib/lib*.so* $out/lib
cp -pdv ${pkgs.zlib}/lib/lib*.so* $out/lib
'';
postDeviceCommands =
''
zpool import -f -a
'';
};
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systemd.services."zpool-import" = {
description = "Import zpools";
after = [ "systemd-udev-settle.service" ];
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
restartIfChanged = false;
ExecStart = "${kernel.zfs}/sbin/zpool import -f -a";
};
};
systemd.services."zfs-mount" = {
description = "Mount ZFS Volumes";
after = [ "zpool-import.service" ];
wantedBy = [ "local-fs.target" ];
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
restartIfChanged = false;
ExecStart = "${kernel.zfs}/sbin/zfs mount -a";
ExecStop = "${kernel.zfs}/sbin/zfs umount -a";
};
};
system.fsPackages = [ kernel.zfs ]; # XXX: needed? zfs doesn't have (need) a fsck
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environment.systemPackages = [ kernel.zfs ];
services.udev.packages = [ kernel.zfs ]; # to hook zvol naming, etc.
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};
}