[core] HUE-2334. Make cx_Oracle compilation optional

desktop/core/ext-py/cx_Oracle-5.1.2/setup.py

@@ -118,7 +118,7 @@ def CheckOracleHome(directoryToCheck):
     return False
 
 # try to determine the Oracle home
-userOracleHome = os.environ.get("ORACLE_HOME")
+userOracleHome = os.environ.get("ORACLE_HOME", os.environ.get("ORACLE_INSTANTCLIENT_HOME"))
 if userOracleHome is not None:
     if not CheckOracleHome(userOracleHome):
         messageFormat = "Oracle home (%s) does not refer to an " \
@@ -129,8 +129,8 @@ def CheckOracleHome(directoryToCheck):
         if CheckOracleHome(path):
             break
     if oracleHome is None:
-        raise DistutilsSetupError("cannot locate an Oracle software " \
-                "installation")
+        print >>sys.stderr, "cannot locate an Oracle software installation. skipping"
+        sys.exit(0)
 
 # define some variables
 if sys.platform == "win32":

desktop/core/src/desktop/tests.py

@@ -627,3 +627,18 @@ def test_check_config_ajax():
   c = make_logged_in_client()
   response = c.get(reverse(check_config))
   assert_true("misconfiguration" in response.content, response.content)
+
+
+def test_cx_Oracle():
+  """
+  Tests that cx_Oracle (external dependency) is built correctly.
+  """
+  try:
+    import cx_Oracle
+    return
+  except ImportError, ex:
+    if "No module named" in ex.message:
+      assert_true(False, "cx_Oracle skipped its build. This happens if "
+          "env var ORACLE_HOME or ORACLE_INSTANTCLIENT_HOME is not defined. "
+          "So ignore this test failure if your build does not need to work "
+          "with an oracle backend.")