29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
79 lines
1.7 KiB
Nix
79 lines
1.7 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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inherit (pkgs.lib) singleton;
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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 = "Whether to enable the Name Service Cache Daemon.";
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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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};
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};
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###### implementation
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config = mkIf cfg.enable {
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users.extraUsers = singleton
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{ name = "nscd";
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uid = config.ids.uids.nscd;
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description = "Name service cache daemon user";
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};
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systemd.services.nscd =
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{ description = "Name Service Cache Daemon";
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wantedBy = [ "nss-lookup.target" "nss-user-lookup.target" ];
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environment = { LD_LIBRARY_PATH = nssModulesPath; };
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preStart =
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''
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mkdir -m 0755 -p /run/nscd
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rm -f /run/nscd/nscd.pid
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mkdir -m 0755 -p /var/db/nscd
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'';
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restartTriggers = [ config.environment.etc.hosts.source ];
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serviceConfig =
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{ ExecStart = "@${pkgs.glibc}/sbin/nscd nscd -f ${pkgs.writeText "nscd.conf" cfg.config}";
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Type = "forking";
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PIDFile = "/run/nscd/nscd.pid";
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Restart = "always";
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ExecReload =
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[ "${pkgs.glibc}/sbin/nscd --invalidate passwd"
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"${pkgs.glibc}/sbin/nscd --invalidate group"
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"${pkgs.glibc}/sbin/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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