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# Configuration for the Name Service Switch (/etc/nsswitch.conf).
{ config, pkgs, ... }:
with pkgs.lib;
let
inherit (config.services.avahi) nssmdns;
inherit (config.services.samba) nsswins;
in
{
options = {
# NSS modules. Hacky!
system.nssModules = mkOption {
internal = true;
default = [];
description = ''
Search path for NSS (Name Service Switch) modules. This allows
several DNS resolution methods to be specified via
<filename>/etc/nsswitch.conf</filename>.
'';
merge = mergeListOption;
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 ];
};
}