+# check for root permissions {{{
+if ! check4root ; then
+ echo "For usage instructions please execute '$PN --help'."
+ exit 1
+fi
+# }}}
+
+# source specified configuration file {{{
+if [ -n "$CONFIGFILE" ] ; then
+ einfo "Reading specified config file $CONFIGFILE."
+ if ! . "$CONFIGFILE" ; then
+ eerror "Error reading config file $CONFIGFILE" ; eend 1 ; exit 1
+ fi
+fi
+# }}}
+