UI deb package improvements

* Purge files when using apt remove --purge
* Display a message to uninstall installed pkgs from pypi when invoking
apt remove
* link autostart .desktop file to /usr/share/applications instead of
copying it

ui/debian/postinst

@@ -2,6 +2,30 @@
 
 set -e
 
+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 protobuf grpcio-tools
+
+    Do you want to install them now?" 15 70 ||
+    if [ $? -eq 0 ]; then
+        echo "Installing grpcio-tools..."
+        pip3 install grpcio-tools || echo "Unable to install grpcio, try it manually."
+        echo
+        echo "Installing protobuf..."
+        pip3 install protobuf || echo "Unable to install protobuf, try it manually."
+        echo
+        echo "Installing slugify..."
+        pip3 install unicode_slugify || echo "Unable to install unicode_slugify, try it manually."
+    fi
+    exit 0
+}
+
 for i in $(ls /home)
 do
     path=/home/$i/.config/autostart/
@@ -9,23 +33,15 @@ do
         mkdir -p $path
     fi
     if [ -f /usr/share/applications/opensnitch_ui.desktop ];then
-        cp /usr/share/applications/opensnitch_ui.desktop $path
+        ln -s /usr/share/applications/opensnitch_ui.desktop $path || true
     fi
 done
 
+set +e
 
-DIALOG=$(which whiptail || which dialog)
+case "$1" in
+    configure)
+        install_pip_pkgs
+        ;;
+esac
 
-$DIALOG --yesno "OpenSnitch GUI needs to install 3 more packages from
-pypi using pip3: unicode_slugify, grpcio-tools and protobuf.\n\nDo you want to install them
-now?" 15 60
-if [ $? -eq 0 ]; then
-    echo "Installing grpcio-tools..."
-    pip3 install grpcio-tools || echo "Unable to install grpcio, try it manually."
-    echo
-    echo "Installing protobuf..."
-    pip3 install protobuf || echo "Unable to install protobuf, try it manually."
-    echo
-    echo "Installing slugify..."
-    pip3 install unicode_slugify || echo "Unable to install unicode_slugify, try it manually."
-fi

ui/debian/postrm

@@ -0,0 +1,23 @@
+#!/bin/sh
+
+set -e
+
+purge_files()
+{
+    for i in $(ls /home)
+    do
+        path=/home/$i/.config/
+        if [ -h $path/autostart/opensnitch_ui.desktop -o -f $path/autostart/opensnitch_ui.desktop ];then
+            rm -f $path/autostart/opensnitch_ui.desktop
+        fi
+        if [ -d $path/opensnitch/ ]; then
+            rm -rf $path/opensnitch/
+        fi
+    done
+}
+
+case "$1" in
+    purge)
+        purge_files
+        ;;
+esac

ui/debian/prerm

@@ -2,18 +2,16 @@
 
 set -e
 
-for i in $(ls /home)
-do
-    path=/home/$i/.config/autostart/opensnitch_ui.desktop
-    if [ -f $path ];then
-        rm -f $path
-    fi
-done
 
-echo
-echo " If you don't need them anymore, remember to uninstall unicode_slugify, grcpio-tools and protobuf:"
-echo
-echo "  pip3 uninstall unicode_slugify"
-echo "  pip3 uninstall grcpio-tools"
-echo "  pip3 uninstall protobuf"
-echo
+case "$1" in
+    remove)
+        echo
+        echo " If you don't need them anymore, remember to uninstall unicode_slugify, grcpio-tools and protobuf:"
+        echo
+        echo "  pip3 uninstall unicode_slugify"
+        echo "  pip3 uninstall grcpio-tools"
+        echo "  pip3 uninstall protobuf"
+        echo
+
+        ;;
+esac