port format inspector tests from glance
This commit is a direct port of the format inspector unit tests from glance as of commit 0d8e79b713bc31a78f0f4eac14ee594ca8520999 the only changes to the test are as follows "from glance.common import format_inspector" was updated to "from nova.image import format_inspector" "from glance.tests import utils as test_utils" was replaced with "from nova import test" "test_utils.BaseTestCase" was replaced with "test.NoDBTestCase" "glance-unittest-formatinspector-" was replaced with "nova-unittest-formatinspector-" This makes the test funtional in nova. TestFormatInspectors requries qemu-img to be installed on the host which would be a new depency for executing unit tests. to avoid that we skip TestFormatInspectors if qemu-img is not installed. TestFormatInspectorInfra and TestFormatInspectorsTargeted do not have a qemu-img dependency so no changes to the test assertions were required. Note for yoga backport:With older qemu installed one of the qemu-img create commands fails, let's skip it from unmaintained/yoga and below that. Change-Id: Ia34203f246f0bc574e11476287dfb33fda7954fe (cherry picked from commit838daa3cad) (cherry picked from commit66205be426) (cherry picked from commit497abea5a1) (cherry picked from commit58cd955c7d) (cherry picked from commitd7e3d722cd)
This commit is contained in:
Sean Mooney
519
nova/tests/unit/image/test_format_inspector.py
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519
nova/tests/unit/image/test_format_inspector.py
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# Copyright 2020 Red Hat, Inc
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import io
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import os
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import re
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import struct
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import subprocess
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import tempfile
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from unittest import mock
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from oslo_utils import units
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from nova.image import format_inspector
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from nova import test
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def get_size_from_qemu_img(filename):
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output = subprocess.check_output('qemu-img info "%s"' % filename,
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shell=True)
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for line in output.split(b'\n'):
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m = re.search(b'^virtual size: .* .([0-9]+) bytes', line.strip())
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if m:
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return int(m.group(1))
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raise Exception('Could not find virtual size with qemu-img')
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class TestFormatInspectors(test.NoDBTestCase):
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def setUp(self):
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super(TestFormatInspectors, self).setUp()
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# these tests depend on qemu-img being installed
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# and in the path, if it is not installed, skip
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try:
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subprocess.check_output('qemu-img --version', shell=True)
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except Exception:
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self.skipTest('qemu-img not installed')
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self._created_files = []
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def tearDown(self):
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super(TestFormatInspectors, self).tearDown()
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for fn in self._created_files:
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try:
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os.remove(fn)
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except Exception:
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pass
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def _create_img(self, fmt, size, subformat=None, options=None,
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backing_file=None):
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if fmt == 'vhd':
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# QEMU calls the vhd format vpc
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fmt = 'vpc'
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if options is None:
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options = {}
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opt = ''
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prefix = 'nova-unittest-formatinspector-'
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if subformat:
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options['subformat'] = subformat
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prefix += subformat + '-'
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if options:
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opt += '-o ' + ','.join('%s=%s' % (k, v)
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for k, v in options.items())
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if backing_file is not None:
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opt += ' -b %s -F raw' % backing_file
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fn = tempfile.mktemp(prefix=prefix,
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suffix='.%s' % fmt)
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self._created_files.append(fn)
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subprocess.check_output(
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'qemu-img create -f %s %s %s %i' % (fmt, opt, fn, size),
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shell=True)
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return fn
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def _create_allocated_vmdk(self, size_mb, subformat=None):
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# We need a "big" VMDK file to exercise some parts of the code of the
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# format_inspector. A way to create one is to first create an empty
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# file, and then to convert it with the -S 0 option.
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if subformat is None:
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# Matches qemu-img default, see `qemu-img convert -O vmdk -o help`
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subformat = 'monolithicSparse'
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prefix = 'nova-unittest-formatinspector-%s-' % subformat
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fn = tempfile.mktemp(prefix=prefix, suffix='.vmdk')
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self._created_files.append(fn)
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raw = tempfile.mktemp(prefix=prefix, suffix='.raw')
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self._created_files.append(raw)
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# Create a file with pseudo-random data, otherwise it will get
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# compressed in the streamOptimized format
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subprocess.check_output(
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'dd if=/dev/urandom of=%s bs=1M count=%i' % (raw, size_mb),
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shell=True)
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# Convert it to VMDK
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subprocess.check_output(
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'qemu-img convert -f raw -O vmdk -o subformat=%s -S 0 %s %s' % (
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subformat, raw, fn),
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shell=True)
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return fn
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def _test_format_at_block_size(self, format_name, img, block_size):
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fmt = format_inspector.get_inspector(format_name)()
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self.assertIsNotNone(fmt,
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'Did not get format inspector for %s' % (
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format_name))
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wrapper = format_inspector.InfoWrapper(open(img, 'rb'), fmt)
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while True:
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chunk = wrapper.read(block_size)
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if not chunk:
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break
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wrapper.close()
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return fmt
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def _test_format_at_image_size(self, format_name, image_size,
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subformat=None):
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img = self._create_img(format_name, image_size, subformat=subformat)
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# Some formats have internal alignment restrictions making this not
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# always exactly like image_size, so get the real value for comparison
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virtual_size = get_size_from_qemu_img(img)
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# Read the format in various sizes, some of which will read whole
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# sections in a single read, others will be completely unaligned, etc.
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for block_size in (64 * units.Ki, 512, 17, 1 * units.Mi):
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fmt = self._test_format_at_block_size(format_name, img, block_size)
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self.assertTrue(fmt.format_match,
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'Failed to match %s at size %i block %i' % (
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format_name, image_size, block_size))
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self.assertEqual(virtual_size, fmt.virtual_size,
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('Failed to calculate size for %s at size %i '
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'block %i') % (format_name, image_size,
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block_size))
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memory = sum(fmt.context_info.values())
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self.assertLess(memory, 512 * units.Ki,
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'Format used more than 512KiB of memory: %s' % (
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fmt.context_info))
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def _test_format(self, format_name, subformat=None):
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# Try a few different image sizes, including some odd and very small
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# sizes
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for image_size in (512, 513, 2057, 7):
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self._test_format_at_image_size(format_name, image_size * units.Mi,
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subformat=subformat)
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def test_qcow2(self):
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self._test_format('qcow2')
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def test_vhd(self):
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self._test_format('vhd')
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def test_vhdx(self):
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self._test_format('vhdx')
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def test_vmdk(self):
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self._test_format('vmdk')
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def test_vmdk_stream_optimized(self):
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self._test_format('vmdk', 'streamOptimized')
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def test_from_file_reads_minimum(self):
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img = self._create_img('qcow2', 10 * units.Mi)
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file_size = os.stat(img).st_size
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fmt = format_inspector.QcowInspector.from_file(img)
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# We know everything we need from the first 512 bytes of a QCOW image,
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# so make sure that we did not read the whole thing when we inspect
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# a local file.
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self.assertLess(fmt.actual_size, file_size)
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def test_qed_always_unsafe(self):
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img = self._create_img('qed', 10 * units.Mi)
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fmt = format_inspector.get_inspector('qed').from_file(img)
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self.assertTrue(fmt.format_match)
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self.assertFalse(fmt.safety_check())
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def _test_vmdk_bad_descriptor_offset(self, subformat=None):
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format_name = 'vmdk'
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image_size = 10 * units.Mi
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descriptorOffsetAddr = 0x1c
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BAD_ADDRESS = 0x400
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img = self._create_img(format_name, image_size, subformat=subformat)
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# Corrupt the header
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fd = open(img, 'r+b')
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fd.seek(descriptorOffsetAddr)
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fd.write(struct.pack('<Q', BAD_ADDRESS // 512))
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fd.close()
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# Read the format in various sizes, some of which will read whole
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# sections in a single read, others will be completely unaligned, etc.
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for block_size in (64 * units.Ki, 512, 17, 1 * units.Mi):
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fmt = self._test_format_at_block_size(format_name, img, block_size)
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self.assertTrue(fmt.format_match,
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'Failed to match %s at size %i block %i' % (
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format_name, image_size, block_size))
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self.assertEqual(0, fmt.virtual_size,
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('Calculated a virtual size for a corrupt %s at '
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'size %i block %i') % (format_name, image_size,
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block_size))
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def test_vmdk_bad_descriptor_offset(self):
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self._test_vmdk_bad_descriptor_offset()
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def test_vmdk_bad_descriptor_offset_stream_optimized(self):
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self._test_vmdk_bad_descriptor_offset(subformat='streamOptimized')
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def _test_vmdk_bad_descriptor_mem_limit(self, subformat=None):
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format_name = 'vmdk'
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image_size = 5 * units.Mi
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virtual_size = 5 * units.Mi
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descriptorOffsetAddr = 0x1c
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descriptorSizeAddr = descriptorOffsetAddr + 8
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twoMBInSectors = (2 << 20) // 512
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# We need a big VMDK because otherwise we will not have enough data to
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# fill-up the CaptureRegion.
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img = self._create_allocated_vmdk(image_size // units.Mi,
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subformat=subformat)
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# Corrupt the end of descriptor address so it "ends" at 2MB
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fd = open(img, 'r+b')
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fd.seek(descriptorSizeAddr)
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fd.write(struct.pack('<Q', twoMBInSectors))
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fd.close()
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# Read the format in various sizes, some of which will read whole
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# sections in a single read, others will be completely unaligned, etc.
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for block_size in (64 * units.Ki, 512, 17, 1 * units.Mi):
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fmt = self._test_format_at_block_size(format_name, img, block_size)
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self.assertTrue(fmt.format_match,
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'Failed to match %s at size %i block %i' % (
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format_name, image_size, block_size))
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self.assertEqual(virtual_size, fmt.virtual_size,
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('Failed to calculate size for %s at size %i '
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'block %i') % (format_name, image_size,
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block_size))
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memory = sum(fmt.context_info.values())
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self.assertLess(memory, 1.5 * units.Mi,
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'Format used more than 1.5MiB of memory: %s' % (
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fmt.context_info))
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def test_vmdk_bad_descriptor_mem_limit(self):
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self._test_vmdk_bad_descriptor_mem_limit()
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def test_vmdk_bad_descriptor_mem_limit_stream_optimized(self):
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self._test_vmdk_bad_descriptor_mem_limit(subformat='streamOptimized')
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def test_qcow2_safety_checks(self):
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# Create backing and data-file names (and initialize the backing file)
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backing_fn = tempfile.mktemp(prefix='backing')
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self._created_files.append(backing_fn)
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with open(backing_fn, 'w') as f:
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f.write('foobar')
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data_fn = tempfile.mktemp(prefix='data')
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self._created_files.append(data_fn)
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# A qcow with no backing or data file is safe
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fn = self._create_img('qcow2', 5 * units.Mi, None)
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inspector = format_inspector.QcowInspector.from_file(fn)
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self.assertTrue(inspector.safety_check())
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# A backing file makes it unsafe
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fn = self._create_img('qcow2', 5 * units.Mi, None,
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backing_file=backing_fn)
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inspector = format_inspector.QcowInspector.from_file(fn)
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self.assertFalse(inspector.safety_check())
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# Note(lajoskatona): This image create fails on bionic due to
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# old qemu-img utilities, let's skip this only test from yoga
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# A data-file makes it unsafe
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# fn = self._create_img('qcow2', 5 * units.Mi,
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# options={'data_file': data_fn,
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# 'data_file_raw': 'on'})
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# inspector = format_inspector.QcowInspector.from_file(fn)
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# self.assertFalse(inspector.safety_check())
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# Trying to load a non-QCOW file is an error
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self.assertRaises(format_inspector.ImageFormatError,
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format_inspector.QcowInspector.from_file,
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backing_fn)
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def test_qcow2_feature_flag_checks(self):
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data = bytearray(512)
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data[0:4] = b'QFI\xFB'
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inspector = format_inspector.QcowInspector()
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inspector.region('header').data = data
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# All zeros, no feature flags - all good
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self.assertFalse(inspector.has_unknown_features)
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# A feature flag set in the first byte (highest-order) is not
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# something we know about, so fail.
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data[0x48] = 0x01
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self.assertTrue(inspector.has_unknown_features)
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# The first bit in the last byte (lowest-order) is known (the dirty
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# bit) so that should pass
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data[0x48] = 0x00
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data[0x4F] = 0x01
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self.assertFalse(inspector.has_unknown_features)
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# Currently (as of 2024), the high-order feature flag bit in the low-
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# order byte is not assigned, so make sure we reject it.
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data[0x4F] = 0x80
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self.assertTrue(inspector.has_unknown_features)
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def test_vdi(self):
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self._test_format('vdi')
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def _test_format_with_invalid_data(self, format_name):
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fmt = format_inspector.get_inspector(format_name)()
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wrapper = format_inspector.InfoWrapper(open(__file__, 'rb'), fmt)
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while True:
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chunk = wrapper.read(32)
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if not chunk:
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break
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wrapper.close()
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self.assertFalse(fmt.format_match)
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self.assertEqual(0, fmt.virtual_size)
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memory = sum(fmt.context_info.values())
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self.assertLess(memory, 512 * units.Ki,
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'Format used more than 512KiB of memory: %s' % (
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fmt.context_info))
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def test_qcow2_invalid(self):
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self._test_format_with_invalid_data('qcow2')
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def test_vhd_invalid(self):
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self._test_format_with_invalid_data('vhd')
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def test_vhdx_invalid(self):
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self._test_format_with_invalid_data('vhdx')
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def test_vmdk_invalid(self):
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self._test_format_with_invalid_data('vmdk')
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def test_vdi_invalid(self):
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self._test_format_with_invalid_data('vdi')
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def test_vmdk_invalid_type(self):
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fmt = format_inspector.get_inspector('vmdk')()
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wrapper = format_inspector.InfoWrapper(open(__file__, 'rb'), fmt)
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while True:
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chunk = wrapper.read(32)
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if not chunk:
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break
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wrapper.close()
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fake_rgn = mock.MagicMock()
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fake_rgn.complete = True
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fake_rgn.data = b'foocreateType="someunknownformat"bar'
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with mock.patch.object(fmt, 'has_region', return_value=True):
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with mock.patch.object(fmt, 'region', return_value=fake_rgn):
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self.assertEqual(0, fmt.virtual_size)
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class TestFormatInspectorInfra(test.NoDBTestCase):
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def _test_capture_region_bs(self, bs):
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data = b''.join(chr(x).encode() for x in range(ord('A'), ord('z')))
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regions = [
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format_inspector.CaptureRegion(3, 9),
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format_inspector.CaptureRegion(0, 256),
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format_inspector.CaptureRegion(32, 8),
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]
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for region in regions:
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# None of them should be complete yet
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self.assertFalse(region.complete)
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||||
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||||
pos = 0
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for i in range(0, len(data), bs):
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chunk = data[i:i + bs]
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pos += len(chunk)
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||||
for region in regions:
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region.capture(chunk, pos)
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||||
self.assertEqual(data[3:12], regions[0].data)
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||||
self.assertEqual(data[0:256], regions[1].data)
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||||
self.assertEqual(data[32:40], regions[2].data)
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||||
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||||
# The small regions should be complete
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||||
self.assertTrue(regions[0].complete)
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||||
self.assertTrue(regions[2].complete)
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||||
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||||
# This region extended past the available data, so not complete
|
||||
self.assertFalse(regions[1].complete)
|
||||
|
||||
def test_capture_region(self):
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||||
for block_size in (1, 3, 7, 13, 32, 64):
|
||||
self._test_capture_region_bs(block_size)
|
||||
|
||||
def _get_wrapper(self, data):
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||||
source = io.BytesIO(data)
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||||
fake_fmt = mock.create_autospec(format_inspector.get_inspector('raw'))
|
||||
return format_inspector.InfoWrapper(source, fake_fmt)
|
||||
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||||
def test_info_wrapper_file_like(self):
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||||
data = b''.join(chr(x).encode() for x in range(ord('A'), ord('z')))
|
||||
wrapper = self._get_wrapper(data)
|
||||
|
||||
read_data = b''
|
||||
while True:
|
||||
chunk = wrapper.read(8)
|
||||
if not chunk:
|
||||
break
|
||||
read_data += chunk
|
||||
|
||||
self.assertEqual(data, read_data)
|
||||
|
||||
def test_info_wrapper_iter_like(self):
|
||||
data = b''.join(chr(x).encode() for x in range(ord('A'), ord('z')))
|
||||
wrapper = self._get_wrapper(data)
|
||||
|
||||
read_data = b''
|
||||
for chunk in wrapper:
|
||||
read_data += chunk
|
||||
|
||||
self.assertEqual(data, read_data)
|
||||
|
||||
def test_info_wrapper_file_like_eats_error(self):
|
||||
wrapper = self._get_wrapper(b'123456')
|
||||
wrapper._format.eat_chunk.side_effect = Exception('fail')
|
||||
|
||||
data = b''
|
||||
while True:
|
||||
chunk = wrapper.read(3)
|
||||
if not chunk:
|
||||
break
|
||||
data += chunk
|
||||
|
||||
# Make sure we got all the data despite the error
|
||||
self.assertEqual(b'123456', data)
|
||||
|
||||
# Make sure we only called this once and never again after
|
||||
# the error was raised
|
||||
wrapper._format.eat_chunk.assert_called_once_with(b'123')
|
||||
|
||||
def test_info_wrapper_iter_like_eats_error(self):
|
||||
fake_fmt = mock.create_autospec(format_inspector.get_inspector('raw'))
|
||||
wrapper = format_inspector.InfoWrapper(iter([b'123', b'456']),
|
||||
fake_fmt)
|
||||
fake_fmt.eat_chunk.side_effect = Exception('fail')
|
||||
|
||||
data = b''
|
||||
for chunk in wrapper:
|
||||
data += chunk
|
||||
|
||||
# Make sure we got all the data despite the error
|
||||
self.assertEqual(b'123456', data)
|
||||
|
||||
# Make sure we only called this once and never again after
|
||||
# the error was raised
|
||||
fake_fmt.eat_chunk.assert_called_once_with(b'123')
|
||||
|
||||
def test_get_inspector(self):
|
||||
self.assertEqual(format_inspector.QcowInspector,
|
||||
format_inspector.get_inspector('qcow2'))
|
||||
self.assertIsNone(format_inspector.get_inspector('foo'))
|
||||
|
||||
|
||||
class TestFormatInspectorsTargeted(test.NoDBTestCase):
|
||||
def _make_vhd_meta(self, guid_raw, item_length):
|
||||
# Meta region header, padded to 32 bytes
|
||||
data = struct.pack('<8sHH', b'metadata', 0, 1)
|
||||
data += b'0' * 20
|
||||
|
||||
# Metadata table entry, 16-byte GUID, 12-byte information,
|
||||
# padded to 32-bytes
|
||||
data += guid_raw
|
||||
data += struct.pack('<III', 256, item_length, 0)
|
||||
data += b'0' * 6
|
||||
|
||||
return data
|
||||
|
||||
def test_vhd_table_over_limit(self):
|
||||
ins = format_inspector.VHDXInspector()
|
||||
meta = format_inspector.CaptureRegion(0, 0)
|
||||
desired = b'012345678ABCDEF0'
|
||||
# This is a poorly-crafted image that specifies a larger table size
|
||||
# than is allowed
|
||||
meta.data = self._make_vhd_meta(desired, 33 * 2048)
|
||||
ins.new_region('metadata', meta)
|
||||
new_region = ins._find_meta_entry(ins._guid(desired))
|
||||
# Make sure we clamp to our limit of 32 * 2048
|
||||
self.assertEqual(
|
||||
format_inspector.VHDXInspector.VHDX_METADATA_TABLE_MAX_SIZE,
|
||||
new_region.length)
|
||||
|
||||
def test_vhd_table_under_limit(self):
|
||||
ins = format_inspector.VHDXInspector()
|
||||
meta = format_inspector.CaptureRegion(0, 0)
|
||||
desired = b'012345678ABCDEF0'
|
||||
meta.data = self._make_vhd_meta(desired, 16 * 2048)
|
||||
ins.new_region('metadata', meta)
|
||||
new_region = ins._find_meta_entry(ins._guid(desired))
|
||||
# Table size was under the limit, make sure we get it back
|
||||
self.assertEqual(16 * 2048, new_region.length)
|
||||
Reference in New Issue
Block a user