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tests: check if snap_on_start=True volumes are not persistent

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Content should be reset back to base volume at each VM startup.
Disposable VMs depend on this behaviour.

QubesOS/qubes-issues#2256
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Marek Marczykowski-Górecki 2016-11-30 23:35:44 +01:00
parent 0be3b1fbb1
commit 48f78dfbc8
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1 changed files with 46 additions and 0 deletions
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46
qubes/tests/integ/storage.py
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@ -211,6 +211,52 @@ class StorageTestMixin(qubes.tests.SystemTestsMixin):
self.assertNotEqual(p.returncode, 0,
'origin changes not visible in snapshot: {}'.format(stdout))
def test_004_snapshot_non_persistent(self):
'''Test snapshot volume non-persistence'''
size = 128 * 1024 * 1024
volume_config = {
'pool': self.pool.name,
'size': size,
'internal': False,
'save_on_stop': True,
'rw': True,
}
testvol = self.vm1.storage.init_volume('testvol', volume_config)
self.vm1.storage.get_pool(testvol).create(testvol)
volume_config = {
'pool': self.pool.name,
'size': size,
'internal': False,
'snap_on_start': True,
'source': testvol.vid,
'rw': True,
}
testvol_snap = self.vm2.storage.init_volume('testvol', volume_config)
self.vm2.storage.get_pool(testvol_snap).create(testvol_snap)
self.app.save()
self.vm2.start()
p = self.vm2.run(
'head -c {} /dev/zero | diff -q /dev/xvde -'.format(size),
user='root', passio_popen=True)
stdout, _ = p.communicate()
self.assertEqual(p.returncode, 0,
'snapshot image not clean: {}'.format(stdout))
self.vm2.run('echo test123 > /dev/xvde && sync', user='root', wait=True)
p.wait()
self.assertEqual(p.returncode, 0,
'Write to read-write snapshot volume failed')
self.vm2.shutdown(wait=True)
self.vm2.start()
p = self.vm2.run(
'head -c {} /dev/zero 2>&1 | diff -q /dev/xvde - 2>&1'.format(size),
user='root', passio_popen=True)
stdout, _ = p.communicate()
self.assertEqual(p.returncode, 0,
'changes on snapshot survived VM restart: {}'.format(
stdout))
class StorageFile(StorageTestMixin, qubes.tests.QubesTestCase):
def init_pool(self):