lib: system: let sys = lib.nixosSystem { inherit system; modules = [ ({ modulesPath, pkgs, ... }: { imports = [ "${modulesPath}/installer/cd-dvd/installation-cd-minimal-new-kernel-no-zfs.nix" ]; boot.kernelPackages = lib.mkForce pkgs.linuxPackages_testing_bcachefs; boot.supportedFilesystems = [ "bcachefs" ]; boot.initrd.availableKernelModules = [ "bcachefs" ]; isoImage.squashfsCompression = "gzip -Xcompression-level 1"; }) ]; }; in sys.config.system.build.isoImage