Include wireless-regdb to resolve #1083 (#1279)

* Add wireless-regdb alongside iwd

Needed for regulatory compliance for Wi-Fi and enabling some bands on some chipsets

* Add wireless-regdb

* Changed location of wireless-regdb install

* configure the wireless-regdom during install

* remove extra newline

* don't unset the variable too early

* also set the region as part of the script

* writing to wireless-regdom requires root

* need to use tee

* changing logic since this is brought in as source

* handle timezones that start with country code already

---------

Co-authored-by: Nirav Patel <eclecticc@users.noreply.github.com>

install/config/hardware/set-wireless-regdom.sh

@@ -0,0 +1,36 @@
+#!/bin/bash
+
+# First check that wireless-regdb is there
+if [ -f "/etc/conf.d/wireless-regdom" ]; then
+  unset WIRELESS_REGDOM
+  . /etc/conf.d/wireless-regdom
+fi
+
+# If the region is already set, we're done
+if [ ! -n "${WIRELESS_REGDOM}" ]; then
+  # Get the current timezone
+  if [ -e "/etc/localtime" ]; then
+    TIMEZONE=$(readlink -f /etc/localtime)
+    TIMEZONE=${TIMEZONE#/usr/share/zoneinfo/}
+    
+    # Some timezones are formatted with the two letter country code at the start
+    COUNTRY="${TIMEZONE%%/*}"
+    
+    # If we don't have a two letter country, get it from the timezone table
+    if [[ ! "$COUNTRY" =~ ^[A-Z]{2}$ ]] && [ -f "/usr/share/zoneinfo/zone.tab" ]; then
+      COUNTRY=$(awk -v tz="$TIMEZONE" '$3 == tz {print $1; exit}' /usr/share/zoneinfo/zone.tab)
+    fi
+    
+    # Check if we have a two letter country code
+    if [[ "$COUNTRY" =~ ^[A-Z]{2}$ ]]; then
+      # Append it to the wireless-regdom conf file that is used at boot
+      echo "WIRELESS_REGDOM=\"$COUNTRY\"" | sudo tee -a /etc/conf.d/wireless-regdom > /dev/null
+        
+      # Also set it one off now
+      if command -v iw &> /dev/null; then
+        sudo iw reg set ${COUNTRY}
+      fi
+    fi
+  fi
+fi
+