ui: improved GUI deb packages

Use debconf to ask questions.

This allow us to:
 - install deb packages using apt frontends (noninteractive, readline,
  etc).
 - display the questions on graphical installers like Gdebi.

closes #75

ui/debian/config

@@ -0,0 +1,9 @@
+#!/bin/sh -e
+
+. /usr/share/debconf/confmodule
+
+# set default value, otherwise the question is not shown on first install
+db_fset python3-opensnitch-ui/question1 seen false
+
+db_input high python3-opensnitch-ui/question1 || true
+db_go

ui/debian/control

@@ -12,15 +12,15 @@ Package: python3-opensnitch-ui
 Architecture: all
 Section: net
 Depends:
- libqt5sql5-sqlite, python3:any, python3-setuptools, python3-six, python3-pyqt5,
+ debconf, libqt5sql5-sqlite, python3:any, python3-setuptools, python3-six, python3-pyqt5,
  python3-pyqt5.qtsql, python3-pyinotify, python3-pip, whiptail | dialog
-Description: GUI for the opensnitch application firewall
+Description: opensnitch application firewall GUI
  opensnitch-ui is a GUI for opensnitch written in Python.
  It allows the user to view live outgoing connections, as well as search
- to make connections.
+ for details of the intercepted connections.
  .
- The user can decide if block the outgoing connection based on properties of
+ The user can decide if block outgoing connections based on properties of
  the connection: by port, by uid, by dst ip, by program or a combination
  of them.
  .
- These rules can last forever, until the app restart or just one time.
+ These rules can last forever, until restart the daemon or just one time.

ui/debian/postinst

@@ -1,24 +1,20 @@
 #!/bin/sh
-
 set -e
 
+. /usr/share/debconf/confmodule
+
 install_pip_pkgs()
 {
-    DIALOG=$(which whiptail || which dialog)
-
-    $DIALOG --yesno "OpenSnitch GUI needs to install 3 more packages:
-    unicode_slugify, grpcio-tools and protobuf.
-    
-    Note: It's better to install them as regular user instead of root:
-    pip3 install --user unicode_slugify grpcio-tools
-
-    Do you want to install them now?" 15 70
-    if [ $? -eq 0 ]; then
+    db_get python3-opensnitch-ui/question1
+    if [ -z "$RET" -o "$RET" = "true" -o "$RET" = "yes" ]; then
         echo "Installing grpcio-tools..."
-        pip3 install grpcio-tools || echo "Unable to install grpcio, try it manually."
+        pip3 -q install grpcio-tools || echo "Unable to install grpcio, try it manually."
         echo
         echo "Installing slugify..."
-        pip3 install unicode_slugify || echo "Unable to install unicode_slugify, try it manually."
+        pip3 -q install unicode_slugify || echo "Unable to install unicode_slugify, try it manually."
+        echo "Done."
+    else
+        echo "Not installing extra packages by user choice (debconf)"
     fi
     exit 0
 }

ui/debian/postrm

@@ -1,9 +1,14 @@
 #!/bin/sh
-
 set -e
 
+. /usr/share/debconf/confmodule
+
 purge_files()
 {
+    if [ -e /usr/share/debconf/confmodule ]; then
+        . /usr/share/debconf/confmodule
+    fi
+
     for i in $(ls /home)
     do
         path=/home/$i/.config/
@@ -17,9 +22,13 @@ purge_files()
 }
 
 pkill -15 opensnitch-ui || true
+db_purge
 
 case "$1" in
     purge)
         purge_files
         ;;
+    remove)
+        db_purge
+        ;;
 esac

ui/debian/prerm

@@ -1,7 +1,9 @@
 #!/bin/sh
-
 set -e
 
+. /usr/share/debconf/confmodule
+
+db_purge
 
 case "$1" in
     remove)

ui/debian/templates

@@ -0,0 +1,7 @@
+Template: python3-opensnitch-ui/question1
+Type: boolean
+Description: Do you want to install them now?
+ OpenSnitch GUI needs to install manually 3 more packages using python3-pip:
+ .
+ unicode_slugify, grpcio-tools and protobuf.
+ .