Optionally recover keys from a master keydrive during interactive install

src/freedombone-config

     choose_dynamic_dns
     choose_default_domain_name
     choose_email_address
+    interactive_key_recovery
 
     # delete the temporary configuration file
     if [ -f temp.cfg ]; then

src/freedombone-utils-keys

             fi
         fi
 
+        if [ -d $GPG_USB_MOUNT/letsencrypt ]; then
+            if [ ! -d /etc/letsencrypt ]; then
+                mkdir /etc/letsencrypt
+            fi
+            echo $'Recovering LetsEncrypt keys'
+            cp -r $GPG_USB_MOUNT/letsencrypt/* /etc/letsencrypt
+        fi
+
         if [ -d $GPG_USB_MOUNT/.gnupg ]; then
             if [ ! -d $HOME_DIR/.gnupg ]; then
                 mkdir $HOME_DIR/.gnupg
             fi
+            echo $'Recovering GPG keys'
             cp -r $GPG_USB_MOUNT/.gnupg/* $HOME_DIR/.gnupg
             GPG_LOADING="no"
             dialog --title $"Recover Encryption Keys" \
     ${PROJECT_NAME}-remote -u $MY_USERNAME -l $REMOTE_SERVERS_LIST -t "Remote server"
 
     if [ ! -f $REMOTE_SERVERS_LIST ]; then
-        dialog --title $"Encryption keys" --msgbox $'Error obtaining server list' 6 70
+        dialog --title $"Encryption Keys Recovery" --msgbox $'Error obtaining server list' 6 70
         return 1
     fi
 
     # check the number of entries in the file
     no_of_servers=$(cat $REMOTE_SERVERS_LIST | wc -l)
     if (( no_of_servers < 3 )); then
-        dialog --title $"Encryption keys" \
+        dialog --title $"Encryption Keys Recovery" \
                --msgbox $'There must be at least three servers to recover the key' 6 70
         return 2
     fi
     apt-get -yq install libgfshare-bin gnupg
     ${PROJECT_NAME}-recoverkey -u $MY_USERNAME -l $REMOTE_SERVERS_LIST
     if [ ! "$?" = "0" ]; then
-        dialog --title $"Encryption keys" --msgbox $'Your key could not be recovered' 6 70
+        dialog --title $"Encryption Keys Recovery" --msgbox $'Your key could not be recovered' 6 70
         return 3
     fi
 
-    dialog --title $"Encryption keys" --msgbox $'Your key has been recovered' 6 70
+    dialog --title $"Encryption Keys Recovery" --msgbox $'Your key has been recovered' 6 70
 
     return 0
 }
     done
 }
 
+function interactive_key_recovery {
+    data=$(tempfile 2>/dev/null)
+    trap "rm -f $data" 0 1 2 5 15
+
+    dialog --title $"Encryption Keys Recovery" \
+           --backtitle $"Freedombone Configuration" \
+           --defaultno \
+           --yesno $"Do you wish to recover your previous encryption keys from a USB master keydrive?" 7 60
+    sel=$?
+    case $sel in
+        1) return;;
+        255) return;;
+    esac
+    ${PROJECT_NAME}-recoverkey -u $MY_USERNAME
+}
+
 # NOTE: deliberately there is no "exit 0"