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https://github.com/u-boot/u-boot.git
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f94a05d1c4
While the dd command actually writes to the block device the truncate command only updates the metadata (at least on ext4). This is faster and reduces wear on the block device. Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
78 lines
2.6 KiB
Python
78 lines
2.6 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, src_dir=None, size_gran = 0x100000):
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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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src_dir (str): Root directory to use, or None for none
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size_gran (int): Size granularity of file system image in bytes
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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.persistent_data_dir, fs_img)
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if fs_type == 'fat12':
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mkfs_opt = '-F 12'
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elif 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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if src_dir:
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if fs_lnxtype == 'ext4':
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mkfs_opt = mkfs_opt + ' -d ' + src_dir
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elif fs_lnxtype != 'vfat':
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raise ValueError(f'src_dir not implemented for fs {fs_lnxtype}')
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count = (size + size_gran - 1) // size_gran
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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'truncate -s $(( {size_gran} * {count} )) {fs_img}',
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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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elif fs_lnxtype == 'vfat' and src_dir:
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check_call(f'mcopy -i {fs_img} -vsmpQ {src_dir}/* ::/', 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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