Add 20190127.sh post-upgrade script

board/common/overlay/usr/share/post-upgrade/20190127.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+# transform various variables in /data/etc/*.conf to uppercase
+
+function to_uppercase() {
+    IFS='='
+    while read line; do
+        parts=(${line})
+        echo $(tr 'a-z' 'A-Z' <<< ${parts[0]})=${parts[1]}
+    done
+    unset IFS
+}
+
+function process_file() {
+    # $1 - file path
+    test -f $1 || return
+    
+    cat $1 | to_uppercase > $1
+}
+
+process_file /data/etc/os.conf
+process_file /data/etc/watch.conf
+process_file /data/etc/date.conf
+process_file /data/etc/static_ip.conf
+