unit tests failed with Mac OSX

[Haomai Wang]

Because of `dd` usage is different from Linux.
*BSD systems `dd` command use b, k, m, g, or w for "bs" option.
Linux `dd` command use c =1, w =2, b =512, kB =1000, K =1024, MB =1000*1000, M =1024*1024, xM =M GB =1000*1000*1000, G =1024*1024*1024, and so on for T, P, E, Z, Y for "bs" option.

I think it may necessary to choose the common sign for tests.

OS: Mac osx

./run_tests.sh

======================================================================
ERROR: cinder.tests.test_scality.ScalityDriverTestCase.test_create_snapshot
----------------------------------------------------------------------
_StringException: Empty attachments:
  pythonlogging:''

Traceback (most recent call last):
  File "/Users/wanghaomai/github/cinder/cinder/tests/test_scality.py", line 167, in test_create_snapshot
    self._driver.create_snapshot(self.TEST_SNAPSHOT)
  File "/Users/wanghaomai/github/cinder/cinder/volume/drivers/scality.py", line 168, in create_snapshot
    self._copy_file(volume_path, snapshot_path)
  File "/Users/wanghaomai/github/cinder/cinder/volume/drivers/scality.py", line 117, in _copy_file
    run_as_root=True)
  File "/Users/wanghaomai/github/cinder/cinder/tests/test_scality.py", line 89, in _execute_wrapper
    utils.execute(cmd, *args, **kwargs)
  File "/Users/wanghaomai/github/cinder/cinder/utils.py", line 193, in execute
    cmd=' '.join(cmd))
ProcessExecutionError: Unexpected error while running command.
Command: dd if=/tmp/fake_mount/volumes/volume_name of=/tmp/fake_mount/volumes/snapshot_name bs=1M conv=fsync,nocreat,notrunc
Exit code: 1
Stdout: ''
Stderr: 'dd: bs: illegal numeric value\n'

======================================================================
ERROR: cinder.tests.test_scality.ScalityDriverTestCase.test_delete_snapshot
----------------------------------------------------------------------
_StringException: Empty attachments:
  pythonlogging:''

Traceback (most recent call last):
  File "/Users/wanghaomai/github/cinder/cinder/tests/test_scality.py", line 175, in test_delete_snapshot
    self._driver.create_snapshot(self.TEST_SNAPSHOT)
  File "/Users/wanghaomai/github/cinder/cinder/volume/drivers/scality.py", line 168, in create_snapshot
    self._copy_file(volume_path, snapshot_path)
  File "/Users/wanghaomai/github/cinder/cinder/volume/drivers/scality.py", line 117, in _copy_file
    run_as_root=True)
  File "/Users/wanghaomai/github/cinder/cinder/tests/test_scality.py", line 89, in _execute_wrapper
    utils.execute(cmd, *args, **kwargs)
  File "/Users/wanghaomai/github/cinder/cinder/utils.py", line 193, in execute
    cmd=' '.join(cmd))
ProcessExecutionError: Unexpected error while running command.
Command: dd if=/tmp/fake_mount/volumes/volume_name of=/tmp/fake_mount/volumes/snapshot_name bs=1M conv=fsync,nocreat,notrunc
Exit code: 1
Stdout: ''
Stderr: 'dd: bs: illegal numeric value\n'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/32538

[John Griffith (john-griffith)]

dd shouldn't actually be called in the unit tests to begin with. I think the correct fix is to stub these calls out, I'm bummed that there's a couple of these that slipped through.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/32538
Committed: http://github.com/openstack/cinder/commit/2ee2a19eb542c08ccd99766e1a6ccee87f427592
Submitter: Jenkins
Branch: master

commit 2ee2a19eb542c08ccd99766e1a6ccee87f427592
Author: Haomai Wang <email address hidden>
Date: Tue Jun 11 16:36:42 2013 +0800

    Fix some unittest cases failed on osx

    dd shouldn't actually be called in the unit tests to begin with. Stub these
    improper calls out.

    Fixes bug: 1188972

    Change-Id: I2966382a66eebbf49ce74e091e444a91ab274869