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

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{ config, lib, pkgs, ... }:
with lib;
let
inInitrd = any (fs: fs == "jfs") config.boot.initrd.supportedFilesystems;
in
{
config = mkIf (any (fs: fs == "jfs") config.boot.supportedFilesystems) {
system.fsPackages = [ pkgs.jfsutils ];
boot.initrd.kernelModules = mkIf inInitrd [ "jfs" ];
boot.initrd.extraUtilsCommands = mkIf inInitrd ''
cp -v ${pkgs.jfsutils}/sbin/fsck.jfs "$out/bin/"
'';
};
}