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69 lines
2.2 KiB
Python
69 lines
2.2 KiB
Python
# SPDX-License-Identifier: GPL-2.0+
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#
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# Copyright (c) 2018, Linaro Limited
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# Author: Takahiro Akashi <takahiro.akashi@linaro.org>
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"""Helper functions for dealing with filesystems"""
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import re
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import os
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from subprocess import call, check_call, check_output, CalledProcessError
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def mk_fs(config, fs_type, size, prefix, use_src_dir=False):
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"""Create a file system volume
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Args:
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config (u_boot_config): U-Boot configuration
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fs_type (str): File system type, e.g. 'ext4'
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size (int): Size of file system in bytes
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prefix (str): Prefix string of volume's file name
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use_src_dir (bool): true to put the file in the source directory
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Raises:
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CalledProcessError: if any error occurs when creating the filesystem
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"""
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fs_img = f'{prefix}.{fs_type}.img'
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fs_img = os.path.join(config.source_dir if use_src_dir
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else config.persistent_data_dir, fs_img)
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if fs_type == 'fat16':
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mkfs_opt = '-F 16'
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elif fs_type == 'fat32':
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mkfs_opt = '-F 32'
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else:
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mkfs_opt = ''
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if re.match('fat', fs_type):
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fs_lnxtype = 'vfat'
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else:
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fs_lnxtype = fs_type
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count = (size + 0x100000 - 1) // 0x100000
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# Some distributions do not add /sbin to the default PATH, where mkfs lives
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if '/sbin' not in os.environ["PATH"].split(os.pathsep):
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os.environ["PATH"] += os.pathsep + '/sbin'
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try:
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check_call(f'rm -f {fs_img}', shell=True)
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check_call(f'dd if=/dev/zero of={fs_img} bs=1M count={count}',
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shell=True)
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check_call(f'mkfs.{fs_lnxtype} {mkfs_opt} {fs_img}', shell=True)
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if fs_type == 'ext4':
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sb_content = check_output(f'tune2fs -l {fs_img}',
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shell=True).decode()
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if 'metadata_csum' in sb_content:
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check_call(f'tune2fs -O ^metadata_csum {fs_img}', shell=True)
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return fs_img
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except CalledProcessError:
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call(f'rm -f {fs_img}', shell=True)
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raise
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# Just for trying out
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if __name__ == "__main__":
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import collections
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CNF= collections.namedtuple('config', 'persistent_data_dir')
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mk_fs(CNF('.'), 'ext4', 0x1000000, 'pref')
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