-echo "Modifying /etc/sudoers"
-echo "$CHROOT_USERNAME ALL=NOPASSWD: `which chroot`, /bin/su - $CHROOT_USERNAME" >> /etc/sudoers
+SUDOERS="$CHROOT_USERNAME ALL=NOPASSWD: $(which chroot), /bin/su - $CHROOT_USERNAME"
+if [ -d /etc/sudoers.d ]; then
+ echo "Installing sudoers configuration file /etc/sudoers.d/jail-$CHROOT_USERNAME"
+ echo "$SUDOERS" > "/etc/sudoers.d/jail-$CHROOT_USERNAME"
+ chmod 0440 "/etc/sudoers.d/jail-$CHROOT_USERNAME"
+else
+ echo "Modifying /etc/sudoers"
+ echo "$SUDOERS" >> /etc/sudoers
+fi