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

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{ pkgs, lib, ... }:
{
config = {
system.fsPackages = [ pkgs.e2fsprogs ];
# As of kernel 4.3, there is no separate ext3 driver (they're also handled by ext4.ko)
# No ext* modules are present on our aarch64, apparently (and maybe elsewhere).
boot.initrd.availableKernelModules =
lib.optionals (!pkgs.stdenv.hostPlatform.isAarch64)
[ "ext2" "ext4" ];
boot.initrd.extraUtilsCommands =
''
# Copy e2fsck and friends.
2015-03-29 00:15:41 +00:00
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
'';
};
}