nixpkgs/nixos/modules/tasks/filesystems/unionfs-fuse.nix

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{ config, pkgs, lib, ... }:
{
config = lib.mkMerge [
(lib.mkIf (lib.any (fs: fs == "unionfs-fuse") config.boot.initrd.supportedFilesystems) {
boot.initrd.kernelModules = [ "fuse" ];
boot.initrd.extraUtilsCommands = ''
cp -v ${pkgs.fuse}/lib/libfuse* $out/lib
cp -v ${pkgs.fuse}/sbin/mount.fuse $out/bin
cp -v ${pkgs.unionfs-fuse}/bin/unionfs $out/bin
substitute ${pkgs.unionfs-fuse}/sbin/mount.unionfs-fuse $out/bin/mount.unionfs-fuse \
--replace '${pkgs.bash}/bin/bash' /bin/sh \
--replace '${pkgs.fuse}/sbin' /bin \
--replace '${pkgs.unionfs-fuse}/bin' /bin
chmod +x $out/bin/mount.unionfs-fuse
'';
boot.initrd.postDeviceCommands = ''
# Hacky!!! fuse hard-codes the path to mount
mkdir -p /nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-${pkgs.utillinux.name}/bin
ln -s $(which mount) /nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-${pkgs.utillinux.name}/bin
ln -s $(which umount) /nix/store/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-${pkgs.utillinux.name}/bin
'';
})
(lib.mkIf (lib.any (fs: fs == "unionfs-fuse") config.boot.supportedFilesystems) {
system.fsPackages = [ pkgs.unionfs-fuse ];
})
];
}