On Thu, Aug 20, 2020 at 9:49 PM Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com> wrote: > > Add python notrun-helper similar to _check_o_direct for bash tests. > To be used in the following commit. > > Signed-off-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com> > Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com> > --- > tests/qemu-iotests/iotests.py | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py > index 717b5b652c..369e9918b4 100644 > --- a/tests/qemu-iotests/iotests.py > +++ b/tests/qemu-iotests/iotests.py > @@ -1083,6 +1083,12 @@ def _verify_aio_mode(supported_aio_modes: > Sequence[str] = ()) -> None: > if supported_aio_modes and (aiomode not in supported_aio_modes): > notrun('not suitable for this aio mode: %s' % aiomode) > > +def verify_o_direct() -> None: > + with FilePath('test_o_direct') as f: > + qemu_img_create('-f', 'raw', f, '1M') > + if 'O_DIRECT' in qemu_io('-f', 'raw', '-t', 'none', '-c', 'quit', f): > + notrun(f'file system at {test_dir} does not support O_DIRECT')
Why not: with FilePath('test_o_direct') as f: try: fd = os.open(f, os.O_DIRECT | os.O_CREAT | os.O_RDWR) except OSError as e: if e.errno != errno.EINVAL: raise notrun(...) else: os.close(fd) More verbose, but the intent is more clear, and we do not depend on the output of qemu-io which is not a public API. For example if someone improves qemu-io to fail with: Direct I/O is not supported It would break the tests using this helper. Nir > + > def supports_quorum(): > return 'quorum' in qemu_img_pipe('--help') > > -- > 2.21.3 > >