If no hostname is set, use mac address to generate one.

Currently not working very well in hyperkit due to https://github.com/docker/vpnkit/issues/190

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

base/init/etc/init.d/rcS

@@ -83,7 +83,16 @@ done
 mdev -s
 
 # set hostname
-[ -s /etc/hostname ] && hostname -F /etc/hostname
+if [ -s /etc/hostname ]
+then
+	hostname -F /etc/hostname
+fi
+
+if [ $(hostname) = "moby" -a -f /sys/class/net/eth0/address ]
+then
+	mac=$(cat /sys/class/net/eth0/address)
+	hostname moby-$(echo $mac | sed 's/://g')
+fi
 
 # set system clock from hwclock
 hwclock --hctosys --utc