# 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; ldap = (config.users.ldap.enable && config.users.ldap.nsswitch); 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 = { # 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. environment.etc."nsswitch.conf".text = '' passwd: files ${optionalString ldap "ldap"} group: files ${optionalString ldap "ldap"} shadow: files ${optionalString ldap "ldap"} hosts: files ${optionalString nssmdns "mdns_minimal [NOTFOUND=return]"} dns ${optionalString nssmdns "mdns"} ${optionalString nsswins "wins"} myhostname mymachines networks: files dns ethers: files services: files protocols: files ''; # Systemd provides 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. Systemd also provides nss-mymachines to return IP # addresses of local containers. system.nssModules = [ config.systemd.package ]; }; }