fix: package upgrades no longer ask the configuration questions.

debian-package/debian/changelog

@@ -1,3 +1,12 @@
+vpn-router (0.5.9-1) unstable; urgency=medium
+
+  fix: package upgrades no longer ask the configuration questions.
+
+  * The configuration questions are asked only on a fresh installation and
+    by dpkg-reconfigure.
+
+ -- Slawomir Koszewski <slawek@koszewscy.waw.pl>  Sat, 24 Oct 2026 21:00:00 +0200
+
 vpn-router (0.5.8-1) unstable; urgency=medium
 
   fix: an upgrade keeps the configuration and asks nothing.

debian-package/debian/config

@@ -2,6 +2,12 @@
 set -e
 . /usr/share/debconf/confmodule
 
+# An upgrade (configure with the old version) asks nothing; vpn-router.json holds the
+# configuration, and dpkg-reconfigure asks the questions again.
+if [ "$1" = "configure" ] && [ -n "$2" ]; then
+    exit 0
+fi
+
 # Every question has a default, so a non-interactive install with nothing
 # preseeded completes without prompting. The defaults are platform "none" and
 # mode "manual", which together mean: install the files, configure nothing.