slock
Setup
To make slock available, amend /etc/nixos/configuration.nix as follows:
{
...
programs.slock.enable = true;
...
}
Troubleshooting
"cannot disable the out-of-memory killer for this process"
slock requires root for accessing passwords and protecting itself from OOM killing. Adding slock to environment.systemPackages is not adequate (nor is it necessary); slock should be enabled via the provided NixOS module via the means shown above.