Don't use sudo in python tests

[Sean Anderson]

On 10/22/22 18:00, Heinrich Schuchardt wrote:
> 
> 
> Am 22. Oktober 2022 20:44:27 MESZ schrieb Sean Anderson <seanga2 at gmail.com>:
>> On 10/22/22 08:04, Tom Rini wrote:
>>> On Sat, Oct 22, 2022 at 10:24:33AM +0200, Heinrich Schuchardt wrote:
>>>> Hello Simon,
>>>>
>>>> As described in doc/develop/py_testing.doc using sudo in python tests
>>>> should be avoided.
>>>>
>>>> * users building U-Boot may not be sudoers
>>>> * running code as sudo comes with a risk
>>>>
>>>> You added sudo in test/py/tests/test_ut.py
>>>>
>>>> Can we use virt-make-fs here?
>>>
>>> Note that virt-make-fs is only suitable for trivial cases as it's
>>> otherwise too slow. This is possibly one of the cases where it's too
>>> slow.
>>>
>>
>> An easy way to do this is to use fuse2fs/fusefat.
> 
> My experience with fusefat is that it was terribly buggy 2-3 years ago.
> 
> Last upstream source is from 2018.

Yeah, I had not used it before. fuse2fs is nice. It doesn't support replaying
the journal, but this doesn't matter when creating a filesystem.

mtools seems incredibly clunky, but it appears to work, and has reasonable
performance.

LKL [1] seemed like it might have been the most robust solution (with lklfuse),
but it hasn't made it upstream yet (and the primary author seems to have stopped
trying).

--Sean

[1] https://github.com/lkl/linux