nixpkgs/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
cfgSpl = config.environment.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 = {
environment.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 adapaters, 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 ];
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/sbin
cp -v ${kernel.zfs}/sbin/zdb $out/sbin
cp -v ${kernel.zfs}/sbin/zpool $out/sbin
'';
postDeviceCommands =
''
zpool import -f -a -d /dev
zfs mount -a
'';
};
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system.fsPackages = [ kernel.zfs ]; # XXX: needed? zfs doesn't have a fsck
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environment.systemPackages = [ kernel.zfs ];
services.udev.packages = [ kernel.zfs ]; # to hook zvol naming, etc.
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};
}