Check status of SSH daemon periodically

Signed-off-by: Jose Borreguero <borreguero@gmail.com>

docker-entrypoint.sh

@@ -13,6 +13,8 @@ fi
 # start the ssh daemon
 /etc/init.d/ssh start
 
-# hack preventing container from exiting
-# uncomment only for debugging purposes
-tail -f /dev/null
+# check the deamon is up every 60 seconds
+while : ; do
+    sleep 60
+    [[ "$(/etc/init.d/ssh status)" = "sshd is running." ]] || break
+done