Don't try to guess the location of the NixOS config file
Don't try to guess the location of the NixOS config file

The NixOS config need not be $NIXOS_CONFIG, it can also be set through
-I nixos-config=... or not exist in a separate file at all (e.g. in a
NixOps deployment).

Issue #212.

SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixos,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,triton/triton,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,andreassalomonsson/nixos,triton/triton,andreassalomonsson/nixos,NixOS/nixos,SymbiFlow/nixpkgs,NixOS/nixos,SymbiFlow/nixpkgs,SymbiFlow/nixpkgs,andreassalomonsson/nixos,NixOS/nixos,SymbiFlow/nixpkgs,NixOS/nixos,SymbiFlow/nixpkgs,NixOS/nixpkgs,triton/triton,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,triton/triton,NixOS/nixos,andreassalomonsson/nixos,NixOS/nixpkgs,triton/triton,triton/triton,SymbiFlow/nixpkgs,NixOS/nixpkgs,triton/triton,NixOS/nixpkgs,NixOS/nixpkgs,NixOS/nixpkgs,andreassalomonsson/nixos,andreassalomonsson/nixos,SymbiFlow/nixpkgs,triton/triton,NixOS/nixpkgs,NixOS/nixpkgs