nixpkgs/upstart-jobs/dhcpd.nix

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{pkgs, config}:
let
cfg = config.services.dhcpd;
stateDir = "/var/lib/dhcp"; # Don't use /var/state/dhcp; not FHS-compliant.
machines = pkgs.lib.concatMapStrings (machine: ''
host ${machine.hostName} {
hardware ethernet ${machine.ethernetAddress};
fixed-address ${machine.ipAddress};
}
'') cfg.machines;
configFile = if cfg.configFile != null then cfg.configFile else pkgs.writeText "dhcpd.conf" ''
default-lease-time 600;
max-lease-time 7200;
authoritative;
ddns-update-style ad-hoc;
log-facility local1; # see dhcpd.nix
${cfg.extraConfig}
${machines}
'';
in
{
name = "dhcpd";
job = ''
description "DHCP server"
start on network-interfaces/started
stop on network-interfaces/stop
script
mkdir -m 755 -p ${stateDir}
touch ${stateDir}/dhcpd.leases
exec ${pkgs.dhcp}/sbin/dhcpd -f -cf ${configFile} \
-lf ${stateDir}/dhcpd.leases \
${toString cfg.interfaces}
end script
'';
}