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List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 10/1/19 3:46 PM, Max Reitz wrote: > Python tests should use these two new functions instead of > qemu_img('create', ...) + os.remove(), so that user-supplied image > options are interpreted and handled correctly. > > Signed-off-by: Max Reitz > --- > tests/qemu-iotests/iotests.py | 56 +++++++++++++++++++++++++++++++++++ > 1 file changed, 56 insertions(+) > > diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py > index b5ea424de4..fce1ab04c9 100644 > --- a/tests/qemu-iotests/iotests.py > +++ b/tests/qemu-iotests/iotests.py > @@ -122,6 +122,62 @@ def qemu_img_create(*args): > > return qemu_img(*args) > > +def create_test_image(filename, size=None, fmt=imgfmt, opts=[], > + backing_file=None, backing_fmt=None, > + objects=[], unsafe=False): Python! It's the language that everybody loves and can do no wrong! Ah, wait, no, maybe the opposite. You want this: (..., opts=None, ...): opts = opts or [] because, unfortunately, default parameters are bound at definition time and not at call time, so the default list here is like a static local. > + if fmt == imgfmt: > + # Only use imgopts for the default format > + opts = imgopts + opts > + > + for i, opt in enumerate(opts): > + if '$TEST_IMG' in opt: > + opts[i] = opt.replace('$TEST_IMG', filename) > + > + # default luks support > + if fmt == 'luks': > + if not any('key-secret' in opt for opt in opts): You can write "if not 'key-secret' in opts" > + opts.append(luks_default_key_secret_opt) And here we might modify that default list. > + objects.append(luks_default_secret_object) > + > + args = ['create', '-f', fmt] > + > + if len(opts) > 0: > + args += ['-o', ','.join(opts)] > + > + if backing_file is not None: > + args += ['-b', backing_file] > + > + if backing_fmt is not None: > + args += ['-F', backing_fmt] > + > + if len(objects) > 0: > + # Generate a [['--object', $obj], [...], ...] list and flatten it > + args += [arg for objarg in (['--object', obj] for obj in objects) \ > + for arg in objarg] I may have mentioned at one point that I love comprehensions, but dislike nested comprehensions. At this point, I think it's far simpler to say: for obj in objects: args.extend(['--object', obj]) or, even shorter: args += ['--object', obj] > + > + if unsafe: > + args.append('-u') > + > + args.append(filename) > + if size is not None: > + args.append(str(size)) > + > + return qemu_img(*args) > + > +# Use this to remove images create with create_test_image in the created and you might as well move the # comment to a """docstring""" while you're here. > +# default image format (iotests.imgfmt) > +def remove_test_image(filename): > + try: > + os.remove(filename) > + > + data_file = next(opt.replace('data_file=', '') \ > + .replace('$TEST_IMG', filename) \ > + for opt in imgopts if opt.startswith('data_file=')) > + Learned something today: you can use next() to get the first value from a generator expression. > + os.remove(data_file) Keep in mind that if the generator expression returns no results, that next() will throw an exception and we won't make it here. That's ok, but, > + except: > + pass > + The unqualified except doesn't help me know which errors you expected and which you didn't. We have a function like this elsewhere in the python directory: def remove_if_exists(filename): try: os.remove(filename) except FileNotFoundError: pass Can we use that here and remove the try:/except: from this function? It will require you to change the list search to something like this instead: remove_if_exists(filename) for opt in (x for x in imgopts if etc): data_file = opt.replace('etc', 'etc') remove_if_exists(data_file) to avoid the exception when you call next(). > def qemu_img_verbose(*args): > '''Run qemu-img without suppressing its output and return the exit code''' > exitcode = subprocess.call(qemu_img_args + list(args)) > My fussiness with the remove() function is just optional picky stuff, but the rest matters, I think. --js