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

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Nix

{ config, lib, pkgs, ... }:
let
inInitrd = lib.any (fs: fs == "ext2" || fs == "ext3" || fs == "ext4") config.boot.initrd.supportedFilesystems;
inSystem = lib.any (fs: fs == "ext2" || fs == "ext3" || fs == "ext4") config.boot.supportedFilesystems;
in
{
config = {
system.fsPackages = lib.mkIf (config.boot.initrd.systemd.enable -> (inInitrd || inSystem)) [ pkgs.e2fsprogs ];
# As of kernel 4.3, there is no separate ext3 driver (they're also handled by ext4.ko)
boot.initrd.availableKernelModules = lib.mkIf (config.boot.initrd.systemd.enable -> inInitrd) [ "ext2" "ext4" ];
boot.initrd.extraUtilsCommands = lib.mkIf (!config.boot.initrd.systemd.enable)
''
# Copy e2fsck and friends.
copy_bin_and_libs ${pkgs.e2fsprogs}/sbin/e2fsck
copy_bin_and_libs ${pkgs.e2fsprogs}/sbin/tune2fs
ln -sv e2fsck $out/bin/fsck.ext2
ln -sv e2fsck $out/bin/fsck.ext3
ln -sv e2fsck $out/bin/fsck.ext4
'';
};
}