[U-Boot] [RFC 1/3] test/py: convert fs-test.sh to pytest

[Alexander Graf]

> Am 31.08.2018 um 09:31 schrieb AKASHI Takahiro <takahiro.akashi at linaro.org>:
> 
>> On Wed, Aug 29, 2018 at 11:36:51PM +0200, Heinrich Schuchardt wrote:
>>> On 08/23/2018 09:25 AM, AKASHI Takahiro wrote:
>>> In this commit, the same set of test cases as in test/fs/fs-test.sh
>>> is provided using pytest framework.
>>> Actually, fs-test.sh provides three variants:"sb" (sb command), "nonfs"
>>> (fatxx and etc.) and "fs" (hostfs), and this patch currently supports
>>> only "nonfs" variant; So it is not a replacement of fs-test.sh for now.
>>> 
>>> Simple usage:
>>>  $ py.test test/py/tests/test_fs [<other options>]
>>> 
>>> You may also specify filesystem types to be tested:
>>>  $ py.test test/py/tests/test_fs --fs-type fat32 [<other options>]
>>> 
>>> Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
>>> ---
>>> test/py/tests/test_fs/conftest.py    | 175 +++++++++++++++++++
>>> test/py/tests/test_fs/fstest_defs.py |  10 ++
>>> test/py/tests/test_fs/test_basic.py  | 246 +++++++++++++++++++++++++++
>>> 3 files changed, 431 insertions(+)
>>> create mode 100644 test/py/tests/test_fs/conftest.py
>>> create mode 100644 test/py/tests/test_fs/fstest_defs.py
>>> create mode 100644 test/py/tests/test_fs/test_basic.py
>>> 
>>> diff --git a/test/py/tests/test_fs/conftest.py b/test/py/tests/test_fs/conftest.py
>>> new file mode 100644
>>> index 000000000000..fefeb4c9663f
>>> --- /dev/null
>>> +++ b/test/py/tests/test_fs/conftest.py
>>> @@ -0,0 +1,175 @@
>>> +# SPDX-License-Identifier:      GPL-2.0+
>>> +# Copyright (c) 2018, Linaro Limited
>>> +# Author: Takahiro Akashi <takahiro.akashi at linaro.org>
>>> +
>>> +import pytest
>>> +import re
>>> +from subprocess import call, check_call, check_output, CalledProcessError
>>> +from fstest_defs import *
>>> +
>>> +supported_fs_basic = ['fat16', 'fat32', 'ext4']
>>> +
>>> +#
>>> +# Filesystem test specific setup
>>> +#
>>> +def pytest_addoption(parser):
>>> +    parser.addoption('--fs-type', action='append', default=None,
>>> +        help='Targeting Filesystem Types')
>>> +
>>> +def pytest_configure(config):
>>> +    global supported_fs_basic
>>> +
>>> +    def intersect(listA, listB):
>>> +        return  [x for x in listA if x in listB]
>>> +
>>> +    supported_fs = config.getoption('fs_type')
>>> +    if supported_fs:
>>> +        print("*** FS TYPE modified: %s" % supported_fs)
>>> +        supported_fs_basic =  intersect(supported_fs, supported_fs_basic)
>>> +
>>> +def pytest_generate_tests(metafunc):
>>> +    if 'fs_obj_basic' in metafunc.fixturenames:
>>> +        metafunc.parametrize('fs_obj_basic', supported_fs_basic,
>>> +            indirect=True, scope='module')
>>> +
>>> +#
>>> +# Helper functions
>>> +#
>>> +def fstype_to_ubname(fs_type):
>>> +    if re.match('fat', fs_type):
>>> +        return 'fat'
>>> +    else:
>>> +        return fs_type
>>> +
>>> +def check_ubconfig(config, fs_type):
>>> +    if not config.buildconfig.get('config_cmd_%s' % fs_type, None):
>>> +        pytest.skip('.config feature "CMD_%s" not enabled' % fs_type.upper())
>>> +    if not config.buildconfig.get('config_%s_write' % fs_type, None):
>>> +        pytest.skip('.config feature "%s_WRITE" not enabled'
>>> +        % fs_type.upper())
>>> +
>>> +def mk_fs(config, fs_type, size, id):
>>> +    fs_img = '%s.%s.img' % (id, fs_type)
>>> +    fs_img = config.persistent_data_dir + '/' + fs_img
>>> +
>>> +    if fs_type == 'fat16':
>>> +        mkfs_opt = '-F 16'
>>> +    elif fs_type == 'fat32':
>>> +        mkfs_opt = '-F 32'
>>> +    else:
>>> +        mkfs_opt = ''
>>> +
>>> +    if re.match('fat', fs_type):
>>> +        fs_lnxtype = 'vfat'
>>> +    else:
>>> +        fs_lnxtype = fs_type
>>> +
>>> +    count = (size + 1023) / 1024
>>> +
>>> +    try:
>>> +        check_call('rm -f %s' % fs_img, shell=True)
>>> +        check_call('dd if=/dev/zero of=%s bs=1K count=%d'
>>> +            % (fs_img, count), shell=True)
>>> +        check_call('mkfs.%s %s %s'
>>> +            % (fs_lnxtype, mkfs_opt, fs_img), shell=True)
>>> +        return fs_img
>>> +    except CalledProcessError:
>>> +        call('rm -f %s' % fs_img, shell=True)
>>> +        raise
>>> +
>>> +#
>>> +# Fixture for basic fs test
>>> +#     derived from test/fs/fs-test.sh
>>> +#
>>> +# NOTE: yield_fixture was deprecated since pytest-3.0
>>> + at pytest.yield_fixture()
>>> +def fs_obj_basic(request, u_boot_config):
>>> +    fs_type = request.param
>>> +    fs_img = ''
>>> +
>>> +    fs_ubtype = fstype_to_ubname(fs_type)
>>> +    check_ubconfig(u_boot_config, fs_ubtype)
>>> +
>>> +    mount_dir = u_boot_config.persistent_data_dir + '/mnt'
>>> +    small_file = mount_dir + '/' + SMALL_FILE
>>> +    big_file = mount_dir + '/' + BIG_FILE
>>> +    try:
>>> +
>>> +        # 3GiB volume
>>> +        fs_img = mk_fs(u_boot_config, fs_type, 0xc0000000, '3GB')
>>> +
>>> +        # Mount the image so we can populate it.
>>> +        check_call('mkdir -p %s' % mount_dir, shell=True)
>>> +        check_call('sudo mount -o loop,rw %s %s'
>>> +            % (fs_img, mount_dir), shell=True)
>> 
>> Should I grant sudo to anybody who can commit to U-Boot?
>> 
>> Just use exfat-fuse and fuse2fs.
> 
> As far fas I tried, exfat-fuse will not be able to mount
> a fat (vfat) file system, unlike fuse2fs handling ext2 as well as ext4.
> So this cannot be a solution.
> If you know how to mount fat fs with exfat-fuse as a non-root user,
> please let me know.

Could we just make use of one of the many fat access libraries available in Python?

Alex