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

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{ config, pkgs, ... }:
with pkgs.lib;
let
inInitrd = any (fs: fs == "vfat") config.boot.initrd.supportedFilesystems;
in
{
config = mkIf (any (fs: fs == "vfat") config.boot.supportedFilesystems) {
system.fsPackages = [ pkgs.dosfstools ];
boot.initrd.kernelModules = mkIf inInitrd [ "vfat" "nls_cp437" "nls_iso8859-1" ];
boot.initrd.extraUtilsCommands = mkIf inInitrd
''
cp -v ${pkgs.dosfstools}/sbin/dosfsck $out/bin
ln -sv dosfsck $out/bin/fsck.vfat
'';
};
}