Enhanced system timezone configuration via U-Boot. (#974)

general/overlay/etc/init.d/rcS

@@ -1,6 +1,7 @@
 #!/bin/sh
 
 # Setting the TimeZone for all processes
+/usr/sbin/timezone.sh
 export TZ=$(cat /etc/TZ)
 
 # Set the firmware creation time as the base system time

general/overlay/usr/sbin/timezone.sh

@@ -0,0 +1,41 @@
+#!/bin/sh
+
+# Get the timezone from the u-boot environment variable
+timezone=$(fw_printenv -n timezone 2>/dev/null)
+if [ -z "$timezone" ]; then
+    echo "Timezone env variable not found, using system default."
+    exit 1
+fi
+
+echo "User defined timezone: $timezone"
+
+# Check if the values in /etc/timezone and /etc/TZ match the ones from fw_printenv
+current_timezone=$(cat /etc/timezone 2>/dev/null)
+current_tz_value=$(cat /etc/TZ 2>/dev/null)
+
+if [ "$timezone" = "$current_timezone" ] && [ "$timezone" = "$current_tz_value" ]; then
+    echo "Timezone settings are already up to date."
+    exit 0
+fi
+
+# Search for the timezone in the file
+matching_line=$(zcat /var/www/a/tz.js.gz | grep -i -F "$timezone")
+if [ -z "$matching_line" ]; then
+    echo "Timezone not found in system file."
+    exit 1
+fi
+
+# Extract the value associated with the timezone
+value=$(echo "$matching_line" | awk -F',' '{print $2}' | awk -F':' '{print $2}' | tr -d "'}")
+
+# Write the TZ file first
+echo $value > /etc/TZ
+
+# Then write the timezone file
+echo $timezone > /etc/timezone
+
+export TZ=$value
+
+if tty -s; then
+    echo "timezone.sh: You are running from a shell, please restart or log out to update timezone environment variables."
+fi