object-storage: Fixing the errors and warnings in unittest.

Change-Id: Id22c968aefd82c4b62445b3ecc93cbabc2b35ffc
BUG: 887301
Signed-off-by: Mohammed Junaid <junaid@redhat.com>
Reviewed-on: http://review.gluster.org/4394
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>
Reviewed-by: Peter Portante <pportant@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>

ufo/test/unit/common/test_diskfile.py

@@ -66,6 +66,21 @@ def _mock_do_unlink(f):
     raise ose
 
 
+def _mock_do_unlink_eacces_err(f):
+    ose = OSError()
+    ose.errno = errno.EACCES
+    raise ose
+
+def _mock_getsize_eaccess_err(f):
+    ose = OSError()
+    ose.errno = errno.EACCES
+    raise ose
+
+def _mock_do_rmdir_eacces_err(f):
+    ose = OSError()
+    ose.errno = errno.EACCES
+    raise ose
+
 class MockRenamerCalled(Exception):
     pass
 
@@ -654,13 +669,16 @@ class TestDiskFile(unittest.TestCase):
             os.chmod(the_path, stats.st_mode & (~stat.S_IWUSR))
 
             # Handle the case do_unlink() raises an OSError
+            __os_unlink = os.unlink
+            os.unlink = _mock_do_unlink_eacces_err
             try:
                 gdf.unlinkold(normalize_timestamp(later))
             except OSError as e:
-                assert e.errno != errno.ENOENT
+                assert e.errno == errno.EACCES
             else:
                 self.fail("Excepted an OSError when unlinking file")
             finally:
+                os.unlink = __os_unlink
                 os.chmod(the_path, stats.st_mode)
 
             assert os.path.isdir(gdf.datadir)
@@ -699,11 +717,14 @@ class TestDiskFile(unittest.TestCase):
 
             stats = os.stat(gdf.datadir)
             os.chmod(gdf.datadir, 0)
+            __os_rmdir = os.rmdir
+            os.rmdir = _mock_do_rmdir_eacces_err
             try:
                 later = float(gdf.metadata['X-Timestamp']) + 1
                 gdf.unlinkold(normalize_timestamp(later))
             finally:
                 os.chmod(gdf.datadir, stats.st_mode)
+                os.rmdir = __os_rmdir
             assert os.path.isdir(gdf.datadir)
             assert os.path.isdir(gdf.data_file)
         finally:
@@ -795,13 +816,16 @@ class TestDiskFile(unittest.TestCase):
             assert not gdf._is_dir
             stats = os.stat(the_path)
             os.chmod(the_path, 0)
+            __os_path_getsize = os.path.getsize
+            os.path.getsize = _mock_getsize_eaccess_err
             try:
                 s = gdf.get_data_file_size()
             except OSError as err:
-                assert err.errno != errno.ENOENT
+                assert err.errno == errno.EACCES
             else:
                 self.fail("Expected OSError exception")
             finally:
+                os.path.getsize = __os_path_getsize
                 os.chmod(the_path, stats.st_mode)
         finally:
             shutil.rmtree(td)
@@ -873,7 +897,15 @@ class TestDiskFile(unittest.TestCase):
                 assert os.path.basename(saved_tmppath)[:3] == '.z.'
                 assert os.path.exists(saved_tmppath)
                 os.write(fd, "123")
+            # At the end of previous with block a close on fd is called.
+            # Calling os.close on the same fd will raise an OSError
+            # exception and we must catch it.
+            try:
                 os.close(fd)
+            except OSError as err:
+                pass
+            else:
+                self.fail("Exception expected")
             assert not os.path.exists(saved_tmppath)
         finally:
             shutil.rmtree(td)