nixpkgs/modules/tasks/filesystems/zfs.nix

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{ config, pkgs, ... }:
with pkgs.lib;
let
inInitrd = any (fs: fs == "zfs") config.boot.initrd.supportedFilesystems;
kernel = config.boot.kernelPackages;
in
{
###### implementation
config = mkIf (any (fs: fs == "zfs") config.boot.supportedFilesystems) {
boot.kernelModules = [ "spl" "zfs" ] ;
boot.extraModulePackages = [ kernel.zfs kernel.spl ];
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boot.initrd.kernelModules = mkIf inInitrd [ "spl" "zfs" ] ;
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boot.initrd.extraUtilsCommands = mkIf inInitrd
''
cp -v ${kernel.zfs}/sbin/zfs $out/sbin
cp -v ${kernel.zfs}/sbin/zdb $out/sbin
cp -v ${kernel.zfs}/sbin/zpool $out/sbin
'';
boot.initrd.postDeviceCommands = mkIf inInitrd
''
zpool import -f -a -d /dev
zfs mount -a
'';
system.fsPackages = [ kernel.zfs ];
environment.systemPackages = [ kernel.zfs ];
services.udev.packages = [ kernel.zfs ];
};
}