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This enables znapzend users to specify its full configuration through NixOS options, without ever needing to use the stateful `znapzendzetup` command. This works by running znapzendzetup with the specified config in ExecPre, just before the znapzend daemon is started. There is also the `pure` option which will clear all previous znapzend setups, making it as stateless as can get, as only the setup declared in configuration.nix will be persisted.
*** 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.