after cloning Opatch fails in $IAS_ORACLE_HOME
[clone@test OPatch]$ opatch lsinventory -detail
Oracle Interim Patch Installer version 1.0.0.0.57
Copyright (c) 2007 Oracle Corporation. All Rights Reserved..
We recommend you refer to the OPatch documentation under
OPatch/docs for usage reference. We also recommend using
the latest OPatch version. For the latest OPatch version
and other support related issues, please refer to document
293369.1 which is viewable from metalink.oracle.com
Oracle Home : /bkpapps/oracle/CLONE/apps/tech_st/10.1.2
Oracle Home Inventory : /bkpapps/oracle/CLONE/apps/tech_st/10.1.2/inventory
Central Inventory : /bkpdb/oracle/oraInventory
from : /etc/oraInst.loc
OUI location : /bkpapps/oracle/CLONE/apps/tech_st/10.1.2/oui
OUI shared library : /bkpapps/oracle/CLONE/apps/tech_st/10.1.2/oui/lib/linux/liboraInstaller.so