Remove touch command from volume.filters

Move touch to privsep and remove it from volume.filters.

Change-Id: I169b45f1176537448871cf23b6362c7ffbb16fff
Signed-off-by: Chuck Short <chucks@redhat.com>

cinder/privsep/path.py

@@ -15,7 +15,7 @@
 #    under the License.
 
 """
-Helpers for cgroup related routines.
+Helpers for path related routines.
 """
 
 import os
@@ -37,3 +37,11 @@ def removefile(path):
     if not os.path.exists(path):
         raise exception.FileNotFound(file_path=path)
     os.unlink(path)
+
+
+@cinder.privsep.sys_admin_pctxt.entrypoint
+def touch(path):
+    if os.path.exists(path):
+        os.utime(path, None)
+    else:
+        open(path, 'a').close()

cinder/tests/unit/volume/drivers/netapp/dataontap/test_nfs_cmode.py

@@ -875,8 +875,10 @@ class NetAppCmodeNfsDriverTestCase(test.TestCase):
     @mock.patch.object(image_utils, 'convert_image')
     @mock.patch.object(image_utils, 'qemu_img_info')
     @mock.patch('os.path.exists')
+    @mock.patch('cinder.privsep.path')
     def test_copy_from_img_service_qcow2_copyoffload_workflow_success(
-            self, mock_exists, mock_qemu_img_info, mock_cvrt_image):
+            self, mock_touch, mock_exists, mock_qemu_img_info,
+            mock_cvrt_image):
         drv = self.driver
         cinder_mount_point_base = '/opt/stack/data/cinder/mnt/'
         # To get the cinder mount point directory, we use:
@@ -933,11 +935,10 @@ class NetAppCmodeNfsDriverTestCase(test.TestCase):
                     '203.0.113.122', '/openstack/glance-flexvol1',
                     destination_copied_file, run_as_root=False,
                     check_exit_code=0
-                ),
-                mock.call('touch', cinder_mount_point, run_as_root=False)
+                )
             ]
         )
-        self.assertEqual(2, drv._execute.call_count)
+        self.assertEqual(1, drv._execute.call_count)
         self.assertEqual(2, drv._delete_file_at_path.call_count)
         self.assertEqual(1, drv._clone_file_dst_exists.call_count)
 

cinder/volume/drivers/netapp/dataontap/nfs_base.py

@@ -39,6 +39,7 @@ from six.moves import urllib
 from cinder import exception
 from cinder.i18n import _
 from cinder.image import image_utils
+import cinder.privsep.path
 from cinder import utils
 from cinder.volume import driver
 from cinder.volume.drivers.netapp.dataontap.utils import loopingcalls
@@ -671,11 +672,8 @@ class NetAppNfsDriver(driver.ManageableVD,
             return False
 
     def _touch_path_to_refresh(self, path):
-        try:
-            # Touching parent directory forces NFS client to flush its cache.
-            self._execute('touch', path, run_as_root=self._execute_as_root)
-        except processutils.ProcessExecutionError:
-            LOG.exception("Failed to touch path %s.", path)
+        # Touching parent directory forces NFS client to flush its cache.
+        cinder.privsep.path.touch(path)
 
     def _discover_file_till_timeout(self, path, timeout=75):
         """Checks if file size at path is equal to size."""

etc/cinder/rootwrap.d/volume.filters

@@ -114,7 +114,6 @@ rm: CommandFilter, rm, root
 
 # cinder/volume/drivers/netapp/dataontap/nfs_base.py:
 netapp_nfs_find: RegExpFilter, find, root, find, ^[/]*([^/\0]+(/+)?)*$, -maxdepth, \d+, -name, img-cache.*, -amin, \+\d+
-netapp_nfs_touch: CommandFilter, touch, root
 
 # cinder/volume/drivers/glusterfs.py
 chgrp: CommandFilter, chgrp, root