self-test: error initializing `mysql_system_database` fixture

[nicoddemus]

https://github.com/pytest-dev/pytest-services/actions/runs/16306706692/job/46054240613

_________________________ ERROR at setup of test_mysql _________________________

run_services = True
mysql_data_dir = '/dev/shm/sr-be7ded3b29b7476d8842b5f4f2e6a525-local/mysql'
mysql_base_dir = '/usr'
mysql_defaults_file = '/tmp/pytest-of-runner/pytest-0/pytest-services0/defaults.cnf'
memory_temp_dir = '/dev/shm/sr-be7ded3b29b7476d8842b5f4f2e6a525-local/tmp'
lock_dir = '/dev/shm/service-locks'
services_log = <Logger [local] pytest_services.log (DEBUG)>

    @pytest.fixture(scope='session')
    def mysql_system_database(
            run_services,
            mysql_data_dir,
            mysql_base_dir,
            mysql_defaults_file,
            memory_temp_dir,
            lock_dir,
            services_log,
    ):
        """Install database to given path."""
        if run_services:
            mysqld = shutil.which('mysqld')
            assert mysqld, 'You have to install mysqld script.'
    
            try:
                services_log.debug('Starting mysqld.')
>               check_output([
                    mysqld,
                    '--defaults-file={0}'.format(mysql_defaults_file),
                    '--initialize-insecure',
                    '--datadir={0}'.format(mysql_data_dir),
                    '--basedir={0}'.format(mysql_base_dir),
                    '--user={0}'.format(os.environ['USER'])
                ])

.tox/py/lib/python3.9/site-packages/pytest_services/mysql.py:63: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

popenargs = (['/usr/sbin/mysqld', '--defaults-file=/tmp/pytest-of-runner/pytest-0/pytest-services0/defaults.cnf', '--initialize-insecure', '--datadir=/dev/shm/sr-be7ded3b29b7476d8842b5f4f2e6a525-local/mysql', '--basedir=/usr', '--user=runner'],)
kwargs = {}
process = <Popen: returncode: 1 args: ['/usr/sbin/mysqld', '--defaults-file=/tmp/pytes...>
output = b''
err = b"mysqld: Can't create directory '/dev/shm/sr-be7ded3b29b7476d8842b5f4f2e6a525-local/mysql/' (OS errno 17 - File exist...908Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.42-0ubuntu0.24.04.2)  (Ubuntu).\n"
retcode = 1
cmd = ['/usr/sbin/mysqld', '--defaults-file=/tmp/pytest-of-runner/pytest-0/pytest-services0/defaults.cnf', '--initialize-insecure', '--datadir=/dev/shm/sr-be7ded3b29b7476d8842b5f4f2e6a525-local/mysql', '--basedir=/usr', '--user=runner']

    def check_output(*popenargs, **kwargs):
        """Run command with arguments and return its output (both stdout and stderr) as a byte string.
    
        If the exit code was non-zero it raises a CalledProcessWithOutputError.
        """
        if 'stdout' in kwargs:
            raise ValueError('stdout argument not allowed, it will be overridden.')
    
        if 'stderr' in kwargs:
            raise ValueError('stderr argument not allowed, it will be overridden.')
    
        process = subprocess.Popen(
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            *popenargs, **kwargs)
        output, err = process.communicate()
        retcode = process.poll()
        if retcode:
            cmd = kwargs.get("args")
            if cmd is None:
                cmd = popenargs[0]
>           raise CalledProcessWithOutputError(retcode, cmd, output, err)
Error: test_services.process.CalledProcessWithOutputError: Command '['/usr/sbin/mysqld', '--defaults-file=/tmp/pytest-of-runner/pytest-0/pytest-services0/defaults.cnf', '--initialize-insecure', '--datadir=/dev/shm/sr-be7ded3b29b7476d8842b5f4f2e6a525-local/mysql', '--basedir=/usr', '--user=runner']' returned non-zero exit status 1. with output: b'' and error: b"mysqld: Can't create directory '/dev/shm/sr-be7ded3b29b7476d8842b5f4f2e6a525-local/mysql/' (OS errno 17 - File exists)\n2025-07-15T23:43:58.751649Z 0 [System] [MY-013169] [Server] /usr/sbin/mysqld (mysqld 8.0.42-0ubuntu0.24.04.2) initializing of server in progress as process 3966\n2025-07-15T23:43:58.752815Z 0 [ERROR] [MY-013236] [Server] The designated data directory /dev/shm/sr-be7ded3b29b7476d8842b5f4f2e6a525-local/mysql/ is unusable. You can remove all files that the server added to it.\n2025-07-15T23:43:58.752831Z 0 [ERROR] [MY-010119] [Server] Aborting\n2025-07-15T23:43:58.752908Z 0 [System] [MY-010910] [Server] /usr/sbin/mysqld: Shutdown complete (mysqld 8.0.42-0ubuntu0.24.04.2)  (Ubuntu).\n"