Fix Wi-Fi country setting

If country is set without running reconfiguring wpa_supplicant, the setting if wpa_cli saves over the config.

debian/changelog

@@ -1,3 +1,9 @@
+raspi-config (20180406+1) stretch; urgency=medium
+
+  * Fix Wi-Fi country setting
+
+ -- Serge Schneider <serge@raspberrypi.org>  Fri, 06 Apr 2018 14:28:02 +0100
+
 raspi-config (20180406) stretch; urgency=medium
 
   * Set Wi-Fi country while connecting to SSID

raspi-config

@@ -428,25 +428,33 @@ get_wifi_country() {
 }
 
 do_wifi_country() {
+  IFACE="$(list_wlan_interfaces | head -n 1)"
+  if [ -z "$IFACE" ]; then
+    if [ "$INTERACTIVE" = True ]; then
+      whiptail --msgbox "No wireless interface found" 20 60
+    fi
+    return 1
+  fi
+
+  if ! wpa_cli -i "$IFACE" status > /dev/null 2>&1; then
+    if [ "$INTERACTIVE" = True ]; then
+      whiptail --msgbox "Could not communicate with wpa_supplicant" 20 60
+    fi
+    return 1
+  fi
+
   oIFS="$IFS"
   if [ "$INTERACTIVE" = True ]; then
     IFS="/"
     value=$(cat /usr/share/zoneinfo/iso3166.tab | tail -n +26 | tr '\t' '/' | tr '\n' '/')
     COUNTRY=$(whiptail --menu "Select the country in which the Pi is to be used" 20 60 10 ${value} 3>&1 1>&2 2>&3)
+    IFS=$oIFS
   else
     COUNTRY=$1
     true
   fi
   if [ $? -eq 0 ];then
-    if [ -e /etc/wpa_supplicant/wpa_supplicant.conf ]; then
-        if grep -q "^country=" /etc/wpa_supplicant/wpa_supplicant.conf ; then
-            sed -i --follow-symlinks "s/^country=.*/country=$COUNTRY/g" /etc/wpa_supplicant/wpa_supplicant.conf
-        else
-            sed -i --follow-symlinks "1i country=$COUNTRY" /etc/wpa_supplicant/wpa_supplicant.conf
-        fi
-    else
-        echo "country=$COUNTRY" > /etc/wpa_supplicant/wpa_supplicant.conf
-    fi
+    wpa_cli -i "$IFACE" set country "$COUNTRY"
     if ! iw reg set "$COUNTRY" 2> /dev/null; then
         ASK_TO_REBOOT=1
     fi
@@ -456,8 +464,8 @@ do_wifi_country() {
     if [ "$INTERACTIVE" = True ]; then
         whiptail --msgbox "Wi-fi country set to $COUNTRY" 20 60 1
     fi
+    wpa_cli -i "$IFACE" save_config > /dev/null 2>&1
   fi
-  IFS=$oIFS
 }
 
 get_hostname() {