fix issue 1828: xCAT not start from hard disk after provsioned statefull node

xCAT/postscripts/cleanup_nvm.sh

@@ -0,0 +1,41 @@
+#!/bin/bash
+# IBM(c) 2010 EPL license http://www.eclipse.org/legal/epl-v10.html
+#(C)IBM Corp
+
+#
+#-----------------------------------------------------------------------------
+#
+#cleanup_nvm.sh
+# It is found that in some case, there will be nvram entries wrote that block
+#     the normal booting for Tuleta server running OPAL mode and OpenPOWER server.
+# This script is used to clean up the nvram entries within host OS, can be run as 
+#     a postscript for xCAT.
+#
+#-----------------------------------------------------------------------------
+
+tries=0
+while true; do
+
+    entries=`nvram --print-config | grep "^petitboot"`
+
+    if [ $? -ne 0 ]; then
+        if [ $tries -gt 0 ]; then
+            echo "The nvram cleaning up is done" 
+        else
+            echo "No nvram entry found that is releated to petitboot"
+        fi
+        exit 0
+    fi
+
+    if [ $tries -ge 5 ]; then
+        echo "The nvram entries can not be cleaned up for $tries times"
+        echo "$entries"
+        exit 1
+    fi
+    while read -r entry
+    do
+        entry_name="${entry%%=*}="
+        `nvram --update-config="$entry_name"`
+    done < <(echo "$entries")
+    tries=$(($tries+1))
+done