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import logging
import os
import tempfile
from subprocess import Popen, PIPE
from time import sleep
from . import log, rmdir
__all__ = ["mount"]
L = logging.getLogger(__name__)
@log
def mount(path, fs_type, part_nr=None):
"""Mount a RAW image file containing an ext2/ext3/ext4/xfs/btrfs/vfat/ntfs
filesystem with read-only support using `lklfuse`.
Make sure you have built `LKL` from the source code:
$ sudo apt install build-essential flex bison bc libfuse-dev \
libarchive-dev xfsprogs python git
$ git clone https://github.com/lkl/linux.git
$ cd linux
$ echo "CONFIG_NTFS_FS=y" >> arch/lkl/configs/defconfig
$ make -C tools/lkl
$ sudo cp tools/lkl/lklfuse /usr/local/bin
Args:
path (str): Path to the RAW image file.
fs_type (str): Filesystem type.
part_nr (int|str): Partition number.
Returns:
Path to the mount point.
"""
mp = tempfile.mkdtemp()
opts = f"ro,type={fs_type}"
if part_nr is not None:
opts += f",part={part_nr}"
if fs_type == "xfs":
# filesystem will be mounted without running log recovery.
# otherwise, the mount will fail.
# see also: https://man7.org/linux/man-pages/man5/xfs.5.html
opts += ",opts=norecovery"
elif fs_type == "ext3" or fs_type == "ext4":
# allow mounting dirty ext3 and ext4 filesystems
# see also: https://man7.org/linux/man-pages/man5/ext3.5.html
# example error message that occurs e.g. when mounting Fedora 26:
# JBD2: recovery failed
# EXT4-fs (vda): error loading journal
opts += ",opts=noload"
cmd = ["lklfuse", path, mp, "-f", "-o", opts]
try:
p = Popen(cmd, stdout=PIPE, stderr=PIPE, text=True)
except Exception as e:
L.error("failed to execute command %s: %r", cmd, e)
rmdir(mp)
return None
while p.poll() is None:
if os.path.ismount(mp):
return mp
sleep(1)
ret = p.poll()
out, err = p.communicate()
out, err = out.strip(), err.strip()
L.error("retcode: %d, stdout: %s, stderr: %s", ret, out, err)
rmdir(mp)
return None
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