ndns: new port
diff --git a/ndns/debian/ndns.preinst b/ndns/debian/ndns.preinst
new file mode 100644
index 0000000..edceb2a
--- /dev/null
+++ b/ndns/debian/ndns.preinst
@@ -0,0 +1,61 @@
+#!/bin/sh
+# preinst script for nfd
+#
+# see: dh_installdeb(1)
+
+set -e
+
+# summary of how this script can be called:
+# * <new-preinst> `install'
+# * <new-preinst> `install' <old-version>
+# * <new-preinst> `upgrade' <old-version>
+# * <old-preinst> `abort-upgrade' <new-version>
+# for details, see http://www.debian.org/doc/debian-policy/ or
+# the debian-policy package
+
+
+case "$1" in
+ install|upgrade)
+ # Now we have to ensure the following state:
+ # /etc/passwd: ndns:x:YYY:ZZZ:NDNS User:/nonexistent:/bin/false
+ # /etc/group: ndns:x:ZZZ:
+ #
+ # Sadly there could any state be present on the system so we have to
+ # modify everything carefully i.e. not doing a chown before creating
+ # the user etc...
+
+ # creating ndns group if he isn't already there
+ if ! getent group ndns >/dev/null; then
+ # Adding system group: ndns.
+ addgroup --system ndns >/dev/null
+ fi
+
+ # creating ndns user if he isn't already there
+ if ! getent passwd ndns >/dev/null; then
+ # Adding system user: ndns.
+ adduser \
+ --system \
+ --disabled-login \
+ --ingroup ndns \
+ --home /var/lib/ndns \
+ --gecos "NDNS User" \
+ --shell /bin/bash \
+ ndns >/dev/null
+ fi
+ ;;
+
+ abort-upgrade)
+ ;;
+
+ *)
+ echo "preinst called with unknown argument \`$1'" >&2
+ exit 1
+ ;;
+esac
+
+# dh_installdeb will replace this with shell code automatically
+# generated by other debhelper scripts.
+
+#DEBHELPER#
+
+exit 0