config/modules/impurity-logger/default.nix

{ config, lib, pkgs, ... }:

let
  mkTracer = name: target: exe: lib.getExe (pkgs.writeShellScriptBin name ''
    echo "PID $PPID executed ${target}" |& ${config.systemd.package}/bin/systemd-cat --identifier=impurity >/dev/null 2>/dev/null
    exec -a "$0" '${exe}' "$@"
  '');
in

{
  environment = {
    usrbinenv = mkTracer "env" "/usr/bin/env" "${pkgs.coreutils}/bin/env";
    binsh = mkTracer "sh" "/bin/sh" "${pkgs.bashInteractive}/bin/sh";
  };
}