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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):
"""Mount a disk image file as a RAW image file in the local filesystem with
read-only support using `qemu-nbd` + `nbdfuse`.
See also:
https://manpages.debian.org/bullseye/qemu-utils/qemu-nbd.8.en.html
https://manpages.debian.org/bullseye/libnbd-bin/nbdfuse.1.en.html
Make sure you have the following packages installed:
$ sudo apt install qemu-utils nbdfuse
Args:
path (str): Path to the disk image file.
Returns:
Path to the directory containing a single virtual file named `nbd`.
"""
mp = tempfile.mkdtemp()
cmd = [
"nbdfuse",
"--readonly",
mp,
"--socket-activation",
"qemu-nbd",
"--read-only",
path
]
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 ""
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 ""
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