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test: Put VM image overlay into /var/tmp

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At least in our CI, the default place to store VM runtime overlays
(testvm.get_temp_dir()) points to a tmpfs file, so that tests can put VM
overlays into RAM and are not affected by slow I/O. But that doesn't
work for composer, as it tends to produce huge overlays due to real-life
OS composed trees.

Use /var/tmp/ instead, which is meant for large files.

Also simplify the VirtMachine invocation -- if `identity_file` is None,
that's fine -- it's the default value of that argument anyway.

Cherry-picked from master commit 9b8e0e2335
This commit is contained in:
Martin Pitt 2020-06-01 23:00:02 +02:00 committed by Martin Pitt
parent cb0bd3eb25
commit b2f79ef4a3
1 changed files with 5 additions and 4 deletions
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9
test/composertest.py
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@ -31,10 +31,11 @@ class VirtMachineTestCase(unittest.TestCase):
def setUpTestMachine(self, image, identity_file=None):
self.network = testvm.VirtNetwork(0)
if identity_file:
self.machine = testvm.VirtMachine(image, networking=self.network.host(), cpus=2, memory_mb=2048, identity_file=identity_file)
else:
self.machine = testvm.VirtMachine(image, networking=self.network.host(), cpus=2, memory_mb=2048)
# default overlay directory is not big enough to hold the large composed trees; thus put overlay into /var/tmp/
self.machine = testvm.VirtMachine(image, networking=self.network.host(),
cpus=2, memory_mb=2048,
overlay_dir="/var/tmp",
identity_file=identity_file)
print("Starting virtual machine '{}'".format(image))
self.machine.start()