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# SPDX-License-Identifier: GPL-2.0+
#
# Helper functions for dealing with filesystems
#
# Copyright (c) 2018, Linaro Limited
# Author: Takahiro Akashi <takahiro.akashi@linaro.org>
import re
import os
from subprocess import call, check_call, check_output, CalledProcessError
def mk_fs(config, fs_type, size, prefix):
"""Create a file system volume
Args:
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
"""
fs_img = '%s.%s.img' % (prefix, 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 + 1048576 - 1) / 1048576
# 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('rm -f %s' % fs_img, shell=True)
check_call('dd if=/dev/zero of=%s bs=1M count=%d'
% (fs_img, count), shell=True)
check_call('mkfs.%s %s %s'
% (fs_lnxtype, mkfs_opt, fs_img), shell=True)
if fs_type == 'ext4':
sb_content = check_output('tune2fs -l %s' % fs_img, shell=True).decode()
if 'metadata_csum' in sb_content:
check_call('tune2fs -O ^metadata_csum %s' % fs_img, shell=True)
return fs_img
except CalledProcessError:
call('rm -f %s' % fs_img, shell=True)
raise
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