NixOS/nixpkgs — pull request #1045 by aristidb (2013-10-05 17:45:59+00:00)
Title: Let rsnapshot use /etc/rsnapshot.conf as configuration instead of non-existent ${rsnapshot}/etc/rsnapshot.conf

This allows using it just like:

```
rsnapshot du
```

if you use NixOS's environment.etc to put the configuration in /etc/rsnapshot.conf.