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# Configuration for the Name Service Switch (/etc/nsswitch.conf).
{ config, lib, pkgs, ... }:
with lib;
{
options = {
# NSS modules. Hacky!
# Only works with nscd!
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
<filename>/etc/nsswitch.conf</filename>.
'';
apply = list:
{
inherit list;
path = makeLibraryPath list;
};
};
system.nssDatabases = {
passwd = mkOption {
type = types.listOf types.str;
description = ''
List of passwd entries to configure in <filename>/etc/nsswitch.conf</filename>.
Note that "files" is always prepended while "systemd" is appended if nscd is enabled.
This option only takes effect if nscd is enabled.
'';
default = [];
};
group = mkOption {
type = types.listOf types.str;
description = ''
List of group entries to configure in <filename>/etc/nsswitch.conf</filename>.
Note that "files" is always prepended while "systemd" is appended if nscd is enabled.
This option only takes effect if nscd is enabled.
'';
default = [];
};
shadow = mkOption {
type = types.listOf types.str;
description = ''
List of shadow entries to configure in <filename>/etc/nsswitch.conf</filename>.
Note that "files" is always prepended.
This option only takes effect if nscd is enabled.
'';
default = [];
};
hosts = mkOption {
type = types.listOf types.str;
description = ''
List of hosts entries to configure in <filename>/etc/nsswitch.conf</filename>.
Note that "files" is always prepended, and "dns" and "myhostname" are always appended.
This option only takes effect if nscd is enabled.
'';
default = [];
};
services = mkOption {
type = types.listOf types.str;
description = ''
List of services entries to configure in <filename>/etc/nsswitch.conf</filename>.
Note that "files" is always prepended.
This option only takes effect if nscd is enabled.
'';
default = [];
};
};
};
imports = [
(mkRenamedOptionModule [ "system" "nssHosts" ] [ "system" "nssDatabases" "hosts" ])
];
config = {
assertions = [
{
# Prevent users from disabling nscd, with nssModules being set.
# If disabling nscd is really necessary, it's still possible to opt out
# by forcing config.system.nssModules to [].
assertion = config.system.nssModules.path != "" -> config.services.nscd.enable;
message = "Loading NSS modules from system.nssModules (${config.system.nssModules.path}), requires services.nscd.enable being set to true.";
}
];
# Name Service Switch configuration file. Required by the C
# library.
environment.etc."nsswitch.conf".text = ''
passwd: ${concatStringsSep " " config.system.nssDatabases.passwd}
group: ${concatStringsSep " " config.system.nssDatabases.group}
shadow: ${concatStringsSep " " config.system.nssDatabases.shadow}
hosts: ${concatStringsSep " " config.system.nssDatabases.hosts}
networks: files
ethers: files
services: ${concatStringsSep " " config.system.nssDatabases.services}
protocols: files
rpc: files
'';
system.nssDatabases = {
passwd = mkBefore [ "files" ];
group = mkBefore [ "files" ];
shadow = mkBefore [ "files" ];
hosts = mkMerge [
(mkOrder 998 [ "files" ])
(mkOrder 1499 [ "dns" ])
];
services = mkBefore [ "files" ];
};
};
}
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