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# SPDX-License-Identifier: GPL-2.0+
#
# Copyright (c) 2018, Linaro Limited
# Author: Takahiro Akashi <takahiro.akashi@linaro.org>
"""Helper functions for dealing with filesystems"""
import re
import os
from subprocess import call, check_call, check_output, CalledProcessError
def mk_fs(config, fs_type, size, prefix, use_src_dir=False):
"""Create a file system volume
Args:
config (u_boot_config): U-Boot configuration
fs_type (str): File system type, e.g. 'ext4'
size (int): Size of file system in bytes
prefix (str): Prefix string of volume's file name
use_src_dir (bool): true to put the file in the source directory
Raises:
CalledProcessError: if any error occurs when creating the filesystem
"""
fs_img = f'{prefix}.{fs_type}.img'
fs_img = os.path.join(config.source_dir if use_src_dir
else 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 + 0x100000 - 1) // 0x100000
# Some distributions do not add /sbin to the default PATH, where mkfs lives
if '/sbin' not in os.environ["PATH"].split(os.pathsep):
os.environ["PATH"] += os.pathsep + '/sbin'
try:
check_call(f'rm -f {fs_img}', shell=True)
check_call(f'dd if=/dev/zero of={fs_img} bs=1M count={count}',
shell=True)
check_call(f'mkfs.{fs_lnxtype} {mkfs_opt} {fs_img}', shell=True)
if fs_type == 'ext4':
sb_content = check_output(f'tune2fs -l {fs_img}',
shell=True).decode()
if 'metadata_csum' in sb_content:
check_call(f'tune2fs -O ^metadata_csum {fs_img}', shell=True)
return fs_img
except CalledProcessError:
call(f'rm -f {fs_img}', shell=True)
raise
# Just for trying out
if __name__ == "__main__":
import collections
CNF= collections.namedtuple('config', 'persistent_data_dir')
mk_fs(CNF('.'), 'ext4', 0x1000000, 'pref')