I use
/etc/nixos/configuration.nixto mange my networks. The problem
I have run into is that to connect to a new network after I add it to
/etc/nixos/configuration.nix, I have to runnixos-rebuild switch,
but this requires a network connection to run properly. Is there a way
to rebuild nixos offine?
If I understand correctly, then I think you want
nixos-rebuild switch --option substitute false
This will stop it trying to look up what paths are available on a
substituter, which should allow it to rebuild without an internet
connection as long as you have all of the dependencies and stuff.