104 lines
3.8 KiB
Python
104 lines
3.8 KiB
Python
"""
|
|
Copyright 2018 Oliver Smith
|
|
|
|
This file is part of pmbootstrap.
|
|
|
|
pmbootstrap is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
pmbootstrap is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with pmbootstrap. If not, see <http://www.gnu.org/licenses/>.
|
|
"""
|
|
import logging
|
|
import os
|
|
import pmb.config
|
|
import pmb.parse
|
|
import pmb.helpers.mount
|
|
|
|
|
|
def create_device_nodes(args, suffix):
|
|
"""
|
|
Create device nodes for null, zero, full, random, urandom in the chroot.
|
|
"""
|
|
try:
|
|
chroot = args.work + "/chroot_" + suffix
|
|
|
|
# Create all device nodes as specified in the config
|
|
for dev in pmb.config.chroot_device_nodes:
|
|
path = chroot + "/dev/" + str(dev[4])
|
|
if not os.path.exists(path):
|
|
pmb.helpers.run.root(args, ["mknod",
|
|
"-m", str(dev[0]), # permissions
|
|
path, # name
|
|
str(dev[1]), # type
|
|
str(dev[2]), # major
|
|
str(dev[3]), # minor
|
|
])
|
|
|
|
# Verify major and minor numbers of created nodes
|
|
for dev in pmb.config.chroot_device_nodes:
|
|
path = chroot + "/dev/" + str(dev[4])
|
|
stat_result = os.stat(path)
|
|
rdev = stat_result.st_rdev
|
|
assert os.major(rdev) == dev[2], "Wrong major in " + path
|
|
assert os.minor(rdev) == dev[3], "Wrong minor in " + path
|
|
|
|
# Verify /dev/zero reading and writing
|
|
path = chroot + "/dev/zero"
|
|
with open(path, "r+b", 0) as handle:
|
|
assert handle.write(bytes([0xff])), "Write failed for " + path
|
|
assert handle.read(1) == bytes([0x00]), "Read failed for " + path
|
|
|
|
# On failure: Show filesystem-related error
|
|
except Exception as e:
|
|
logging.info(str(e) + "!")
|
|
raise RuntimeError("Failed to create device nodes in the '" +
|
|
suffix + "' chroot.")
|
|
|
|
|
|
def mount_dev_tmpfs(args, suffix="native"):
|
|
"""
|
|
Mount tmpfs inside the chroot's dev folder to make sure we can create
|
|
device nodes, even if the filesystem of the work folder does not support
|
|
it.
|
|
"""
|
|
# Do nothing when it is already mounted
|
|
dev = args.work + "/chroot_" + suffix + "/dev"
|
|
if pmb.helpers.mount.ismount(dev):
|
|
return
|
|
|
|
# Create the $chroot/dev folder and mount tmpfs there
|
|
pmb.helpers.run.root(args, ["mkdir", "-p", dev])
|
|
pmb.helpers.run.root(args, ["mount", "-t", "tmpfs",
|
|
"-o", "size=1M,noexec,dev",
|
|
"tmpfs", dev])
|
|
|
|
# Create pts, shm folders and device nodes
|
|
pmb.helpers.run.root(args, ["mkdir", "-p", dev + "/pts", dev + "/shm"])
|
|
create_device_nodes(args, suffix)
|
|
|
|
|
|
def mount(args, suffix="native"):
|
|
# Mount tmpfs as the chroot's /dev
|
|
mount_dev_tmpfs(args, suffix)
|
|
|
|
# Get all mountpoints
|
|
arch = pmb.parse.arch.from_chroot_suffix(args, suffix)
|
|
mountpoints = {}
|
|
for source, target in pmb.config.chroot_mount_bind.items():
|
|
source = source.replace("$WORK", args.work)
|
|
source = source.replace("$ARCH", arch)
|
|
mountpoints[source] = target
|
|
|
|
# Mount if necessary
|
|
for source, target in mountpoints.items():
|
|
target_full = args.work + "/chroot_" + suffix + target
|
|
pmb.helpers.mount.bind(args, source, target_full)
|