82 lines
2.4 KiB
Python
82 lines
2.4 KiB
Python
# Copyright 2022 Oliver Smith
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# SPDX-License-Identifier: GPL-3.0-or-later
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import glob
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import json
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import logging
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import os
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import time
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import pmb.helpers.mount
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import pmb.helpers.run
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import pmb.chroot
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def init(args):
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if not os.path.isdir("/sys/module/loop"):
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pmb.helpers.run.root(args, ["modprobe", "loop"])
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for loopdevice in glob.glob("/dev/loop*"):
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if os.path.isdir(loopdevice):
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continue
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pmb.helpers.mount.bind_file(args, loopdevice,
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args.work + "/chroot_native/" + loopdevice)
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def mount(args, img_path):
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"""
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:param img_path: Path to the img file inside native chroot.
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"""
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logging.debug("(native) mount " + img_path + " (loop)")
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# Try to mount multiple times (let the kernel module initialize #1594)
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for i in range(0, 5):
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# Retry
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if i > 0:
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logging.debug("loop module might not be initialized yet, retry in"
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" one second...")
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time.sleep(1)
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# Mount and return on success
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init(args)
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losetup_cmd = ["losetup", "-f", img_path]
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sector_size = args.deviceinfo["rootfs_image_sector_size"]
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if sector_size:
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losetup_cmd += ["-b", str(int(sector_size))]
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pmb.chroot.root(args, losetup_cmd, check=False)
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if device_by_back_file(args, img_path):
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return
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# Failure: raise exception
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raise RuntimeError("Failed to mount loop device: " + img_path)
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def device_by_back_file(args, back_file, auto_init=True):
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"""
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Get the /dev/loopX device that points to a specific image file.
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"""
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# Get list from losetup
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losetup_output = pmb.chroot.root(args, ["losetup", "--json", "--list"],
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output_return=True, auto_init=auto_init)
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if not losetup_output:
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return None
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# Find the back_file
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losetup = json.loads(losetup_output)
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for loopdevice in losetup["loopdevices"]:
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if loopdevice["back-file"] == back_file:
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return loopdevice["name"]
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return None
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def umount(args, img_path, auto_init=True):
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"""
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:param img_path: Path to the img file inside native chroot.
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"""
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device = device_by_back_file(args, img_path, auto_init)
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if not device:
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return
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logging.debug("(native) umount " + device)
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pmb.chroot.root(args, ["losetup", "-d", device], auto_init=auto_init)
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