Backup tapVPN files instead remove directly

 This preserve old tapVPN working while upgrade the packages.

templates/debian/preinst

+#!/bin/sh
+set -e
+
+. /usr/share/debconf/confmodule
+
+if [ -f /etc/openvpn/vifib.conf ]; then
+    cp -f /etc/openvpn/vifib.conf /etc/openvpn/vifib.backup.conf
+    mkdir -p /etc/openvpn/vifib-keys
+    cp -rf /etc/openvpn/vifib-keys /etc/openvpn/vifib-backup-keys
+    sed -i "s/\/etc\/openvpn\/vifib-keys/\/etc\/openvpn\/vifib-backup-keys/g"  /etc/openvpn/vifib.backup.conf
+fi
+
+#DEBHELPER#
+
+exit 0

templates/slapos.spec.in

@@ -96,6 +96,14 @@ mkdir -p $RPM_BUILD_ROOT/opt/slapos/log
 /
 %defattr(-,root,root)
 
+%pre
+if [ -f /etc/openvpn/vifib.conf ]; then
+    cp -f /etc/openvpn/vifib.conf /etc/openvpn/vifib.backup.conf
+    mkdir -p /etc/openvpn/vifib-keys
+    cp -rf /etc/openvpn/vifib-keys /etc/openvpn/vifib-backup-keys
+    sed -i "s/\/etc\/openvpn\/vifib-keys/\/etc\/openvpn\/vifib-backup-keys/g"  /etc/openvpn/vifib.backup.conf
+fi
+
 %post
 echo """To generate slapos configuration run '#slapos node register'"""
 if [ -f /bin/systemctl ]; then