Process substitution in luks module prevents using an empty passwordFile for provisioning.

[liarokapisv]

disko/lib/types/luks.nix

Line 20 in 67ff980

''<(set +x; echo -n "$(cat ${config.passwordFile})"; set -x)''

^ The above process substitution makes cryptsetup fail when the file is empty. Just referencing the file directly works. You can easily test by touch-ing an empty file and testing with cryptsetup directly with both approaches.

Is there a reason that process substitution is used in this instance?