nixpkgs/upstart-jobs/ntpd.nix

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{ntp, modprobe, glibc, pwdutils, writeText, servers}:
let
stateDir = "/var/lib/ntp";
ntpUser = "ntp";
config = writeText "ntp.conf" "
driftfile ${stateDir}/ntp.drift
${toString (map (server: "server " + server + "\n") servers)}
";
ntpFlags = "-c ${config} -u ${ntpUser}:nogroup -i ${stateDir}";
in
{
name = "ntpd";
job = "
description \"NTP daemon\"
start on ip-up
stop on ip-down
stop on shutdown
start script
if ! ${glibc}/bin/getent passwd ${ntpUser} > /dev/null; then
${pwdutils}/sbin/useradd -g nogroup -d ${stateDir} -s /noshell \\
-c 'NTP daemon user' ${ntpUser}
fi
mkdir -m 0755 -p ${stateDir}
chown ${ntpUser} ${stateDir}
# Needed to run ntpd as an unprivileged user.
${modprobe}/sbin/modprobe capability
${ntp}/bin/ntpd -q -g ${ntpFlags}
end script
respawn ${ntp}/bin/ntpd -n ${ntpFlags}
";
}