96 lines
2.8 KiB
Nix
96 lines
2.8 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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nssModulesPath = config.system.nssModules.path;
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cfg = config.services.nscd;
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in
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{
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###### interface
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options = {
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services.nscd = {
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enable = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to enable the Name Service Cache Daemon.
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Disabling this is strongly discouraged, as this effectively disables NSS Lookups
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from all non-glibc NSS modules, including the ones provided by systemd.
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'';
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};
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config = mkOption {
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type = types.lines;
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default = builtins.readFile ./nscd.conf;
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description = "Configuration to use for Name Service Cache Daemon.";
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};
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package = mkOption {
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type = types.package;
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default = if pkgs.stdenv.hostPlatform.libc == "glibc"
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then pkgs.stdenv.cc.libc.bin
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else pkgs.glibc.bin;
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defaultText = lib.literalExpression ''
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if pkgs.stdenv.hostPlatform.libc == "glibc"
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then pkgs.stdenv.cc.libc.bin
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else pkgs.glibc.bin;
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'';
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description = "package containing the nscd binary to be used by the service";
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};
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};
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};
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###### implementation
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config = mkIf cfg.enable {
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environment.etc."nscd.conf".text = cfg.config;
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systemd.services.nscd =
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{ description = "Name Service Cache Daemon";
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before = [ "nss-lookup.target" "nss-user-lookup.target" ];
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wants = [ "nss-lookup.target" "nss-user-lookup.target" ];
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wantedBy = [ "multi-user.target" ];
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environment = { LD_LIBRARY_PATH = nssModulesPath; };
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restartTriggers = [
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config.environment.etc.hosts.source
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config.environment.etc."nsswitch.conf".source
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config.environment.etc."nscd.conf".source
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];
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# We use DynamicUser because in default configurations nscd doesn't
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# create any files that need to survive restarts. However, in some
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# configurations, nscd needs to be started as root; it will drop
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# privileges after all the NSS modules have read their configuration
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# files. So prefix the ExecStart command with "!" to prevent systemd
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# from dropping privileges early. See ExecStart in systemd.service(5).
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serviceConfig =
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{ ExecStart = "!@${cfg.package}/bin/nscd nscd";
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Type = "forking";
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DynamicUser = true;
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RuntimeDirectory = "nscd";
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PIDFile = "/run/nscd/nscd.pid";
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Restart = "always";
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ExecReload =
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[ "${cfg.package}/bin/nscd --invalidate passwd"
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"${cfg.package}/bin/nscd --invalidate group"
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"${cfg.package}/bin/nscd --invalidate hosts"
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];
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};
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};
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};
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}
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