[PATCH 1/3] test_fs: Allow running unprivileged

[Richard Weinberger]

Am Freitag, 16. August 2024, 00:14:18 CEST schrieb Tom Rini:
> This brings two new pylint errors:
> test/py/tests/fs_helper.py:47:12: E0704: The raise statement is not inside an except clause (misplaced-bare-raise)

This raise was on purpose, I wanted the test to fail when an unsupported filesystem is used.
I have changed it to an assert 0.

> test/py/tests/fs_helper.py:78:4: E1120: No value for argument 'src_dir' in function call (no-value-for-parameter)

Fixed too.

But I'm still wrestling with the Azure pipeline.
After wasting^wspending a full afternoon, I think I know what is going on.

With my patches applied, it always failed like that:

___________________________ test_ut_dm_init_bootstd ____________________________
test/py/tests/test_ut.py:234: in setup_bootflow_image
    u_boot_utils.run_and_log(cons, 'mkimage -f auto -d %s %s' %
test/py/u_boot_utils.py:181: in run_and_log
    output = runner.run(cmd, ignore_errors=ignore_errors, stdin=stdin, env=env)
test/py/multiplexed_log.py:183: in run
    raise exception
test/py/multiplexed_log.py:141: in run
    p = subprocess.Popen(cmd, cwd=cwd,
/usr/lib/python3.10/subprocess.py:971: in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
/usr/lib/python3.10/subprocess.py:1863: in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
E   FileNotFoundError: [Errno 2] No such file or directory: 'mkimage'

This makes little sense because I'm not touching mkimage nor PATH.

It turned out that without my changes, mount_image() always fails
inside the Azure pipeline.
So, in setup_bootflow_image() the whole try/catch block around
image creating, mounting it, etc.. fails and it always falls back
to the prepared image via copy_prepared_image().
The log print('Falled to create image, failing back to prepared copy: %s', str(exc))
is never shown because the test itself succeeds.

My patches change the tests to work without root privileges, so mount_image()
is no longer needed and no exception occurs.
As a consequence, mkimage is used the very first time on the Azure pipeline via:
u_boot_utils.run_and_log(cons, 'mkimage -f auto -d %s %s' % (inf, os.path.join(scratch_dir, vmlinux)))

To my best knowledge, u-boot-tools are not installed in the docker image,
nor does the test framework install mkimage.
So, the failure is expected.  Running test_ut.my manually always worked
within my test bed because I had mkimage installed.

So, can we please have mkimage inside the Docker image?

Thanks,
//richard

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