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nixpkgs/upstart-jobs/dhclient.nix

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{dhcp, nettools}:
{
name = "dhclient";
job = "
description \"DHCP client\"
start on network-interfaces/started
stop on network-interfaces/stop
script
# Determine the interface on which to start dhclient.
interfaces=
# !!! apparent race; operstate seems to have a slight delay, so
# if dhclient is started right after network-interfaces, we don't
# always see all the interfaces.
#for i in $(cd /sys/class/net && ls -d *); do
# if test \"$i\" != \"lo\" -a \"$(cat /sys/class/net/$i/operstate)\" != 'down'; then
# interfaces=\"$interfaces $i\"
# fi
#done
for i in $(${nettools}/sbin/ifconfig | grep '^[^ ]' | sed 's/ .*//'); do
if test \"$i\" != \"lo\"; then
interfaces=\"$interfaces $i\"
fi
done
if test -z \"$interfaces\"; then
echo 'No interfaces on which to start dhclient!'
exit 1
fi
mkdir -m 755 -p /var/state/dhcp
exec ${dhcp}/sbin/dhclient -d $interfaces
end script
";
}