debian: have a proper postinst script that reload (not restart, omg) nginx...

debian/postinst

@@ -1,5 +1,34 @@
 #!/bin/bash
 
-yunohost app ssowatconf > /dev/null 2>&1
-service nginx restart > /dev/null 2>&1
+set -e
+
+do_configure() {
+    systemctl reload nginx || true
+}
+
+# summary of how this script can be called:
+#        * <postinst> `configure' <most-recently-configured-version>
+#        * <old-postinst> `abort-upgrade' <new version>
+#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
+#          <new-version>
+#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
+#          <failed-install-package> <version> `removing'
+#          <conflicting-package> <version>
+# for details, see http://www.debian.org/doc/debian-policy/ or
+# the debian-policy package
+
+case "$1" in
+    configure)
+        do_configure
+    ;;
+    abort-upgrade|abort-remove|abort-deconfigure)
+    ;;
+    *)
+        echo "postinst called with unknown argument \`$1'" >&2
+        exit 1
+    ;;
+esac
+
+#DEBHELPER#
+
 exit 0