from subprocess import call, check_call, check_output, CalledProcessError
from subprocess import DEVNULL
-def mk_fs(config, fs_type, size, prefix, src_dir=None, size_gran = 0x100000,
- fs_img=None, quiet=False):
+# size_gran (int): Size granularity of file system image in bytes
+SIZE_GRAN = 1 << 20
+
+
+def mk_fs(config, fs_type, size, prefix, src_dir=None, fs_img=None, quiet=False):
"""Create a file system volume
Args:
size (int): Size of file system in bytes
prefix (str): Prefix string of volume's file name
src_dir (str): Root directory to use, or None for none
- size_gran (int): Size granularity of file system image in bytes
fs_img (str or None): Leaf filename for image, or None to use a
default name. The image is always placed under
persistent_data_dir.
elif fs_lnxtype != 'vfat' and fs_lnxtype != 'exfat':
raise ValueError(f'src_dir not implemented for fs {fs_lnxtype}')
- count = (size + size_gran - 1) // size_gran
+ count = (size + SIZE_GRAN - 1) // SIZE_GRAN
# Some distributions do not add /sbin to the default PATH, where mkfs lives
if '/sbin' not in os.environ["PATH"].split(os.pathsep):
try:
check_call(f'rm -f {fs_img}', shell=True)
- check_call(f'truncate -s $(( {size_gran} * {count} )) {fs_img}',
+ check_call(f'truncate -s $(( {SIZE_GRAN} * {count} )) {fs_img}',
shell=True)
check_call(f'mkfs.{fs_lnxtype} {mkfs_opt} {fs_img}', shell=True,
stdout=DEVNULL if quiet else None)