nixpkgs/nixos/modules/services/system/nscd.nix

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{ config, lib, pkgs, ... }:
with lib;
let
nssModulesPath = config.system.nssModules.path;
cfg = config.services.nscd;
inherit (lib) singleton;
cfgFile = pkgs.writeText "nscd.conf" cfg.config;
in
{
###### interface
options = {
services.nscd = {
enable = mkOption {
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type = types.bool;
default = true;
description = "Whether to enable the Name Service Cache Daemon.";
};
config = mkOption {
type = types.lines;
default = builtins.readFile ./nscd.conf;
description = "Configuration to use for Name Service Cache Daemon.";
};
};
};
###### implementation
config = mkIf cfg.enable {
users.extraUsers.nscd.description = "Name service cache daemon user";
systemd.services.nscd =
{ description = "Name Service Cache Daemon";
wantedBy = [ "nss-lookup.target" "nss-user-lookup.target" ];
environment = { LD_LIBRARY_PATH = nssModulesPath; };
preStart =
''
mkdir -m 0755 -p /run/nscd
rm -f /run/nscd/nscd.pid
mkdir -m 0755 -p /var/db/nscd
'';
restartTriggers = [ config.environment.etc.hosts.source config.environment.etc."nsswitch.conf".source ];
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serviceConfig =
{ ExecStart = "@${pkgs.glibc}/sbin/nscd nscd -f ${cfgFile}";
Type = "forking";
PIDFile = "/run/nscd/nscd.pid";
Restart = "always";
ExecReload =
[ "${pkgs.glibc}/sbin/nscd --invalidate passwd"
"${pkgs.glibc}/sbin/nscd --invalidate group"
"${pkgs.glibc}/sbin/nscd --invalidate hosts"
];
};
# Urgggggh... Nscd forks before opening its socket and writing
# its pid. So wait until it's ready.
postStart =
''
while ! ${pkgs.glibc}/sbin/nscd -g -f ${cfgFile} > /dev/null; do
sleep 0.2
done
'';
};
};
}