Add support for saving VM state after test failure

client/common_lib/test.py

Index: client/common_lib/test.py
diff --git a/client/common_lib/test.py b/client/common_lib/test.py
index 766766b4902e181f2dcca5dbffe51f7071263ba9..72e155877bb1ff0998d070fc1080746d910f46db 100644
--- a/client/common_lib/test.py
+++ b/client/common_lib/test.py
@@ -19,6 +19,7 @@
 import fcntl, getpass, os, re, sys, shutil, tarfile, tempfile, time, traceback
 import warnings, logging, glob, resource
 
+from datetime import datetime
 from autotest_lib.client.common_lib import error
 from autotest_lib.client.bin import utils
 
@@ -418,6 +419,13 @@ class base_test(object):
                 except:
                     pass # don't let logging exceptions here interfere
 
+                # Save the VM state immediately after the test failure.
+                # This is a NOOP if the the test isn't running in a VM or
+                # if the VM is not properly configured to save state.
+                now = datetime.now().strftime('%I:%M:%S.%f')
+                checkpoint_name = "%s-%s" % (self.tagged_testname, now)

[sosa, 2010/11/24 01:02:54]

Don't mix "" and ''

[sosa, 2010/11/24 01:02:54]

It may be more useful to get something about the machine ... lsb-release entry
maybe like the version of chromeos?

[thieule, 2010/11/24 18:00:45]

Done.

[thieule, 2010/11/24 18:00:45]

The qcow2 file is tied to a particular base image.  The qcow2 file and
chromiumos_qemu_image.bin will be uploaded to a common Google Storage folder
that will contain the build information.  I was using the checkpoint name as a
way to identify the various VM states after a test failure.  The timestamp in
the checkpoint name can be used to correlate with the logs.  Also, some tests
are executed more than once in a suite and I needed a way to uniquely identify
each instance.

+                utils.save_vm_state(checkpoint_name)
+
                 # Save the exception while we run our cleanup() before
                 # reraising it.
                 exc_info = sys.exc_info()