depot/nixos/modules/config/nsswitch.nix
Luke Granger-Brown 57725ef3ec Squashed 'third_party/nixpkgs/' content from commit 76612b17c0ce
git-subtree-dir: third_party/nixpkgs
git-subtree-split: 76612b17c0ce71689921ca12d9ffdc9c23ce40b2
2024-11-10 23:59:47 +00:00

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Nix

# Configuration for the Name Service Switch (/etc/nsswitch.conf).
{ config, lib, pkgs, ... }:
{
options = {
# NSS modules. Hacky!
# Only works with nscd!
system.nssModules = lib.mkOption {
type = lib.types.listOf lib.types.path;
internal = true;
default = [ ];
description = ''
Search path for NSS (Name Service Switch) modules. This allows
several DNS resolution methods to be specified via
{file}`/etc/nsswitch.conf`.
'';
apply = list:
{
inherit list;
path = lib.makeLibraryPath list;
};
};
system.nssDatabases = {
passwd = lib.mkOption {
type = lib.types.listOf lib.types.str;
description = ''
List of passwd entries to configure in {file}`/etc/nsswitch.conf`.
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 = lib.mkOption {
type = lib.types.listOf lib.types.str;
description = ''
List of group entries to configure in {file}`/etc/nsswitch.conf`.
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 = lib.mkOption {
type = lib.types.listOf lib.types.str;
description = ''
List of shadow entries to configure in {file}`/etc/nsswitch.conf`.
Note that "files" is always prepended.
This option only takes effect if nscd is enabled.
'';
default = [ ];
};
sudoers = lib.mkOption {
type = lib.types.listOf lib.types.str;
description = ''
List of sudoers entries to configure in {file}`/etc/nsswitch.conf`.
Note that "files" is always prepended.
This option only takes effect if nscd is enabled.
'';
default = [ ];
};
hosts = lib.mkOption {
type = lib.types.listOf lib.types.str;
description = ''
List of hosts entries to configure in {file}`/etc/nsswitch.conf`.
Note that "files" is always prepended, and "dns" and "myhostname" are always appended.
This option only takes effect if nscd is enabled.
'';
default = [ ];
};
services = lib.mkOption {
type = lib.types.listOf lib.types.str;
description = ''
List of services entries to configure in {file}`/etc/nsswitch.conf`.
Note that "files" is always prepended.
This option only takes effect if nscd is enabled.
'';
default = [ ];
};
};
};
imports = [
(lib.mkRenamedOptionModule [ "system" "nssHosts" ] [ "system" "nssDatabases" "hosts" ])
];
config = {
assertions = [
{
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.
If disabling nscd is really necessary, it is possible to disable loading NSS modules
by setting `system.nssModules = lib.mkForce [];` in your configuration.nix.
'';
}
];
# Name Service Switch configuration file. Required by the C
# library.
environment.etc."nsswitch.conf".text = ''
passwd: ${lib.concatStringsSep " " config.system.nssDatabases.passwd}
group: ${lib.concatStringsSep " " config.system.nssDatabases.group}
shadow: ${lib.concatStringsSep " " config.system.nssDatabases.shadow}
sudoers: ${lib.concatStringsSep " " config.system.nssDatabases.sudoers}
hosts: ${lib.concatStringsSep " " config.system.nssDatabases.hosts}
networks: files
ethers: files
services: ${lib.concatStringsSep " " config.system.nssDatabases.services}
protocols: files
rpc: files
'';
system.nssDatabases = {
passwd = lib.mkBefore [ "files" ];
group = lib.mkBefore [ "files" ];
shadow = lib.mkBefore [ "files" ];
sudoers = lib.mkBefore [ "files" ];
hosts = lib.mkMerge [
(lib.mkOrder 998 [ "files" ])
(lib.mkOrder 1499 [ "dns" ])
];
services = lib.mkBefore [ "files" ];
};
};
}