def test_chain_after_finalize(self, base_fmt):
with self.make_env(format=base_fmt, chain_len=3) as env:
base_vol = env.chain[0]
# We write data to the base and will read it from the child volume
# to verify that the chain is valid after qemu-rebase.
offset = 0
pattern = 0xf0
length = 1024
qemu_pattern_write(base_vol.volumePath,
sc.fmt2str(base_vol.getFormat()),
offset=offset,
len=length,
pattern=pattern)
top_vol = env.chain[1]
child_vol = env.chain[2]
subchain_info = dict(sd_id=base_vol.sdUUID,
img_id=base_vol.imgUUID,
base_id=base_vol.volUUID,
top_id=top_vol.volUUID,
base_generation=0)
subchain = merge.SubchainInfo(subchain_info, 0)
merge.finalize(subchain)
qemu_pattern_verify(child_vol.volumePath,
sc.fmt2str(child_vol.getFormat()),
offset=offset,
len=length,
pattern=pattern)
def test_optimal_size_cow_leaf_not_empty(self):
# verify that optimal size is limited to max size.
with self.make_volume(size=GIB, format=sc.COW_FORMAT) as vol:
qemu_pattern_write(path=vol.volumePath,
format=sc.fmt2str(vol.getFormat()),
len=200 * MEGAB)
max_size = vol.max_size(GIB, vol.getFormat())
self.assertEqual(vol.optimal_size(), max_size)
def test_no_match(self, img_format):
with namedTemporaryDir() as tmpdir:
path = os.path.join(tmpdir, 'test')
qemuimg.create(path, '1m', img_format)
qemu_pattern_write(path, img_format, pattern=2)
self.assertRaises(ChainVerificationError,
qemu_pattern_verify,
path,
img_format,
pattern=4)
def make_image(path, size, format, index, qcow2_compat, backing=None):
qemuimg.create(path,
size=size,
format=format,
qcow2Compat=qcow2_compat,
backing=backing)
offset = index * 1024
qemu_pattern_write(path,
format,
offset=offset,
len=1024,
pattern=0xf0 + index)
def test_match_custom_offset_and_len(self, offset, len):
with namedTemporaryDir() as tmpdir:
path = os.path.join(tmpdir, 'test')
qemuimg.create(path, '1m', qemuimg.FORMAT.QCOW2)
qemu_pattern_write(path,
qemuimg.FORMAT.QCOW2,
offset=offset,
len=len)
qemu_pattern_verify(path,
qemuimg.FORMAT.QCOW2,
offset=offset,
len=len)
def test_one_block(self, offset, length, expected_length, qcow2_compat):
with namedTemporaryDir() as tmpdir:
size = 1048576
image = os.path.join(tmpdir, "base.img")
qemuimg.create(image,
size=size,
format=self.FORMAT,
qcow2Compat=qcow2_compat)
qemu_pattern_write(image,
self.FORMAT,
offset=offset,
len=length,
pattern=0xf0)
expected = [
# run 1 - empty
{
"start": 0,
"length": offset,
"data": False,
"zero": True,
},
# run 2 - data
{
"start": offset,
"length": expected_length,
"data": True,
"zero": False,
},
# run 3 - empty
{
"start": offset + expected_length,
"length": size - offset - expected_length,
"data": False,
"zero": True,
},
]
self.check_map(qemuimg.map(image), expected)
def test_match(self, img_format):
with namedTemporaryDir() as tmpdir:
path = os.path.join(tmpdir, 'test')
qemuimg.create(path, '1m', img_format)
qemu_pattern_write(path, img_format)
qemu_pattern_verify(path, img_format)