97 lines
2.9 KiB
Python
97 lines
2.9 KiB
Python
"""
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Copyright 2018 Oliver Smith
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This file is part of pmbootstrap.
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pmbootstrap is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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pmbootstrap is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with pmbootstrap. If not, see <http://www.gnu.org/licenses/>.
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"""
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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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loopdevices = [loopdev for loopdev in glob.glob("/dev/loop*") if not os.path.isdir(loopdev)]
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for loopdev in loopdevices:
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pmb.helpers.mount.bind_blockdevice(args, loopdev,
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args.work + "/chroot_native/" + loopdev)
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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):
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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",
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"--list"], output_return=True)
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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):
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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)
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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])
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