fix: package upgrades no longer ask the configuration questions.

README.md

@@ -86,8 +86,8 @@ that deploy a router on Azure or GCP.
 
 `/etc/vpn-router/vpn-router.json` is JSON, mode 0600, and is created on first install. It
 is managed with `ucf`, so it is yours to edit: a later `dpkg-reconfigure` applies the answers
-given and asks before touching anything you altered by hand, and an upgrade leaves the file as
+given and asks before touching anything you altered by hand, and an upgrade asks no questions
-it is and asks nothing. Settings the file leaves out take their defaults when it is read, so a
+and leaves the file as it is. Settings the file leaves out take their defaults when it is read, so a
 file written by cloud-init or by hand needs only the settings that differ. A complete example is
 installed at `/usr/share/doc/vpn-router/vpn-router.json.example`.
 

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.