120 lines
4.5 KiB
Python
120 lines
4.5 KiB
Python
"""
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Copyright 2019 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 logging
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import os
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import pmb.config
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import pmb.parse
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import pmb.helpers.mount
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def create_device_nodes(args, suffix):
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"""
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Create device nodes for null, zero, full, random, urandom in the chroot.
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"""
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try:
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chroot = args.work + "/chroot_" + suffix
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# Create all device nodes as specified in the config
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for dev in pmb.config.chroot_device_nodes:
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path = chroot + "/dev/" + str(dev[4])
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if not os.path.exists(path):
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pmb.helpers.run.root(args, ["mknod",
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"-m", str(dev[0]), # permissions
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path, # name
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str(dev[1]), # type
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str(dev[2]), # major
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str(dev[3]), # minor
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])
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# Verify major and minor numbers of created nodes
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for dev in pmb.config.chroot_device_nodes:
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path = chroot + "/dev/" + str(dev[4])
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stat_result = os.stat(path)
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rdev = stat_result.st_rdev
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assert os.major(rdev) == dev[2], "Wrong major in " + path
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assert os.minor(rdev) == dev[3], "Wrong minor in " + path
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# Verify /dev/zero reading and writing
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path = chroot + "/dev/zero"
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with open(path, "r+b", 0) as handle:
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assert handle.write(bytes([0xff])), "Write failed for " + path
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assert handle.read(1) == bytes([0x00]), "Read failed for " + path
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# On failure: Show filesystem-related error
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except Exception as e:
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logging.info(str(e) + "!")
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raise RuntimeError("Failed to create device nodes in the '" +
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suffix + "' chroot.")
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def mount_dev_tmpfs(args, suffix="native"):
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"""
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Mount tmpfs inside the chroot's dev folder to make sure we can create
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device nodes, even if the filesystem of the work folder does not support
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it.
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"""
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# Do nothing when it is already mounted
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dev = args.work + "/chroot_" + suffix + "/dev"
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if pmb.helpers.mount.ismount(dev):
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return
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# Create the $chroot/dev folder and mount tmpfs there
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pmb.helpers.run.root(args, ["mkdir", "-p", dev])
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pmb.helpers.run.root(args, ["mount", "-t", "tmpfs",
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"-o", "size=1M,noexec,dev",
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"tmpfs", dev])
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# Create pts, shm folders and device nodes
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pmb.helpers.run.root(args, ["mkdir", "-p", dev + "/pts", dev + "/shm"])
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pmb.helpers.run.root(args, ["mount", "-t", "tmpfs",
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"-o", "nodev,nosuid,noexec",
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"tmpfs", dev + "/shm"])
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create_device_nodes(args, suffix)
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def mount(args, suffix="native"):
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# Mount tmpfs as the chroot's /dev
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mount_dev_tmpfs(args, suffix)
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# Get all mountpoints
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arch = pmb.parse.arch.from_chroot_suffix(args, suffix)
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mountpoints = {}
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for source, target in pmb.config.chroot_mount_bind.items():
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source = source.replace("$WORK", args.work)
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source = source.replace("$ARCH", arch)
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mountpoints[source] = target
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# Mount if necessary
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for source, target in mountpoints.items():
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target_full = args.work + "/chroot_" + suffix + target
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pmb.helpers.mount.bind(args, source, target_full)
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def mount_native_into_foreign(args, suffix):
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source = args.work + "/chroot_native"
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target = args.work + "/chroot_" + suffix + "/native"
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pmb.helpers.mount.bind(args, source, target)
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musl = os.path.basename(glob.glob(source + "/lib/ld-musl-*.so.1")[0])
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musl_link = args.work + "/chroot_" + suffix + "/lib/" + musl
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if not os.path.lexists(musl_link):
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pmb.helpers.run.root(args, ["ln", "-s", "/native/lib/" + musl,
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musl_link])
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