# Configuration for the Name Service Switch (/etc/nsswitch.conf). { config, lib, pkgs, ... }: with lib; let inherit (config.services.avahi) nssmdns; inherit (config.services.samba) nsswins; in { options = { # NSS modules. Hacky! system.nssModules = mkOption { type = types.listOf types.path; internal = true; default = []; description = '' Search path for NSS (Name Service Switch) modules. This allows several DNS resolution methods to be specified via /etc/nsswitch.conf. ''; apply = list: { inherit list; path = makeLibraryPath list; }; }; }; config = { environment.etc = [ # Name Service Switch configuration file. Required by the C library. # !!! Factor out the mdns stuff. The avahi module should define # an option used by this module. { source = pkgs.writeText "nsswitch.conf" '' passwd: files ldap group: files ldap shadow: files ldap hosts: files ${optionalString nssmdns "mdns_minimal [NOTFOUND=return]"} dns ${optionalString nssmdns "mdns"} ${optionalString nsswins "wins"} myhostname networks: files dns ethers: files services: files protocols: files ''; target = "nsswitch.conf"; } ]; # Use nss-myhostname to ensure that our hostname always resolves to # a valid IP address. It returns all locally configured IP # addresses, or ::1 and 127.0.0.2 as fallbacks. system.nssModules = [ pkgs.systemd ]; }; }