Michael Weiss a6afdbb70b
nixos: Allow empty hostnames again
This fixes a regression from 993baa587c4 which requires
networking.hostName to be a valid DNS label [0].
Unfortunately we missed the fact that the hostnames may also be empty,
if the user wants to obtain it from a DHCP server. This is even required
by a few modules/images (e.g. Amazon EC2, Azure, and Google Compute).

[0]: https://github.com/NixOS/nixpkgs/pull/76542#issuecomment-638138666
2020-06-03 15:23:37 +02:00
..
2014-04-15 23:43:39 +02:00