Description of problem:

When osa0dispatcher is started the following message appears:

sh: dbhome: command not found

Version-Release number of selected component (if applicable):

# rpm -q cx_Oracle
cx_Oracle-4.2.1-5.el5

How reproducible:

Deterministic.

Steps to Reproduce:
1. Unset ORACLE_HOME, as Spacewalk installation no longer sets ORACLE_HOME for root.
2. Run service osa-dispatcher start or any other Python program which connects to the database.
  
Actual results:

# service osa-dispatcher start
Starting osa-dispatcher: sh: dbhome: command not found
                                                           [  OK  ]
#

Expected results:

# service osa-dispatcher start
Starting osa-dispatcher:                                   [  OK  ]
#

Additional info:

The code which calls dbhome is in

/usr/share/rhn/server/rhnSQL/driver_cx_Oracle.py:

        if not os.environ.has_key("ORACLE_HOME"):
            os.environ["ORACLE_HOME"] = os.popen("dbhome '*'").read()

It probably should not be there, or it should check that /usr/bin/dbhome (?) exists before trying, or it should redirect stderr, or something.