Initial auto update engine test harness commit.

Initial auto update engine test harness.

This harness has support for test on vm machines.  It takes a base image and target image path, creates an update-enabled vm image from the base image and performs updates using cros_run_vm_update (vm wrapper around image_to_live).  It uses --snapshot for updating vm's and keeps them on (like a real machine would) so that the VM image is clean on the next test.

The current check in has two test cases -- updates without clobbering the stateful partition and updates with clobbering the stateful partition.  

Change-Id: I5406eadb39fa36601d17f8dd15625bd6a8b38c15

BUG=6911
TEST=Ran through tests.

Committed: http://chrome-svn/viewvc/chromeos?view=rev&revision=bccc7c1

[sosa, 2010-09-29 01:46:56]

petkov - for use of cros_run_vm_update (though free to do all)

adlr/rtc - for actual tests.

[petkov, 2010-09-29 20:49:53]

LGTM

http://codereview.chromium.org/3554002/diff/2001/3002
File bin/cros_au_test_harness.py (right):

http://codereview.chromium.org/3554002/diff/2001/3002#newcode20
bin/cros_au_test_harness.py:20: global base_image_path
any way you can avoid these globals?

http://codereview.chromium.org/3554002/diff/2001/3002#newcode37
bin/cros_au_test_harness.py:37: old:  Don't modify stateful partition.  Just
update normally.
'old', 'clean'

http://codereview.chromium.org/3554002/diff/2001/3002#newcode50
bin/cros_au_test_harness.py:50: #self.VerifyImage()
why is this commented out?

http://codereview.chromium.org/3554002/diff/2001/3002#newcode144
bin/cros_au_test_harness.py:144: '--test_case=%s' % 'suite_Smoke'
make suiteSmoke a global constant?

[sosa, 2010-09-30 22:05:05]

Re-tested and pushing.

http://codereview.chromium.org/3554002/diff/2001/3002
File bin/cros_au_test_harness.py (right):

http://codereview.chromium.org/3554002/diff/2001/3002#newcode20
bin/cros_au_test_harness.py:20: global base_image_path
On 2010/09/29 20:49:54, petkov wrote:
> any way you can avoid these globals?
> 
I couldn't find a way :(.  It's very hard to pass items to unit tests since you
don't have control over their instances.

http://codereview.chromium.org/3554002/diff/2001/3002#newcode37
bin/cros_au_test_harness.py:37: old:  Don't modify stateful partition.  Just
update normally.
On 2010/09/29 20:49:54, petkov wrote:
> 'old', 'clean'
> 

Done.

http://codereview.chromium.org/3554002/diff/2001/3002#newcode50
bin/cros_au_test_harness.py:50: #self.VerifyImage()
On 2010/09/29 20:49:54, petkov wrote:
> why is this commented out?
> 
> 

Done.

http://codereview.chromium.org/3554002/diff/2001/3002#newcode144
bin/cros_au_test_harness.py:144: '--test_case=%s' % 'suite_Smoke'
On 2010/09/29 20:49:54, petkov wrote:
> make suiteSmoke a global constant?
> 

Done.