baac242a1f
Running it from systemd rather than cron has several advantages: systemd ensures that only one instance runs at a time; the GC can be manually started/stopped; and logging goes to the journal. We still need cron to start the service at the right time, but hopefully soon we can get rid of cron entirely (once systemd supports starting a unit at a specific time).
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.