An absolute path to an executable to be run for each process killed. Some environment variables are available, see README and the man page for details. WARNING: earlyoom is running in a sandbox with ProtectSystem=“strict” by default, so filesystem write is also prohibited for the hook. If you want to change these protection rules, override the systemd service via systemd.services.earlyoom.serviceConfig.ProtectSystem.

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pkgs.writeShellScript "earlyoom-kill-hook" ''
  echo "Process $EARLYOOM_NAME ($EARLYOOM_PID) was killed" >> /path/to/log
''