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nixpkgs/upstart-jobs/dhclient.nix
Eelco Dolstra cc3803f207 * An Upstart job for ifplugd, which monitors Ethernet interfaces
for cables being plugged in or unplugged.  When this occurs, the
  dhclient service is restarted to automatically obtain a new IP 
  address.  This is useful for roaming users (laptops).

svn path=/nixos/trunk/; revision=9124
2007-08-14 16:43:56 +00:00

51 lines
1.1 KiB
Nix

{dhcp, nettools, interfaces, lib}:
let
# Don't start dhclient on explicitly configured interfaces.
ignoredInterfaces = ["lo"] ++
map (i: i.name) (lib.filter (i: i ? ipAddress) interfaces);
stateDir = "/var/lib/dhcp"; # Don't use /var/state/dhcp; not FHS-compliant.
in
{
name = "dhclient";
extraPath = [dhcp];
job = "
description \"DHCP client\"
start on network-interfaces/started
stop on network-interfaces/stop
env PATH_DHCLIENT_SCRIPT=${dhcp}/sbin/dhclient-script
script
export PATH=${nettools}/sbin:$PATH
# Determine the interface on which to start dhclient.
interfaces=
for i in $(cd /sys/class/net && ls -d *); do
if ! for j in ${toString ignoredInterfaces}; do echo $j; done | grep -F -x -q \"$i\"; then
echo \"Running dhclient on $i\"
interfaces=\"$interfaces $i\"
fi
done
if test -z \"$interfaces\"; then
echo 'No interfaces on which to start dhclient!'
exit 1
fi
mkdir -m 755 -p ${stateDir}
exec ${dhcp}/sbin/dhclient -d $interfaces -e \"PATH=$PATH\" -lf ${stateDir}/dhclient.leases
end script
";
}