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#!/usr/bin/env python3
import multiprocessing
import os
import pathlib
import shutil
import subprocess
import sys
import re
import common
defaults = {
'baseline': False,
'buildroot_bare_kernel': False,
'buildroot_config': [],
'buildroot_config_fragment': [],
'initramfs': False,
'initrd': False,
'kernel_config': [],
'kernel_config_fragment': [],
'kernel_custom_config_file': None,
'kernel_modules': False,
'linux_reconfigure': False,
'no_all': False,
'nproc': None,
'skip_configure': False,
'verbose': False,
'extra_make_args': [],
}
def get_argparse():
parser = common.get_argparse(argparse_args={'description':'Run Linux on an emulator'})
common.add_build_arguments(parser)
parser.add_argument(
'-B', '--buildroot-config', default=defaults['buildroot_config'], action='append',
help='''Add a single Buildroot config to the current build.
Example value: 'BR2_TARGET_ROOTFS_EXT2_SIZE="512M"'.
Can be used multiple times to add multiple configs.
Takes precedence over any Buildroot config files.
'''
)
parser.add_argument(
'-b', '--buildroot-config-fragment', default=defaults['buildroot_config_fragment'], action='append',
help='''Also use the given Buildroot configuration fragment file.
Pass multiple times to use multiple fragment files.'''
)
parser.add_argument(
'--baseline', default=defaults['baseline'], action='store_true',
help='''Do a default-ish Buildroot defconfig build, without any of our extra options.
Mostly to track how much slower we are than a basic build.'''
)
parser.add_argument(
'-C', '--kernel-config', default=defaults['kernel_config'], action='append',
help='''Add a single kernel config configs to the current build.
Example value: 'CONFIG_FORTIFY_SOURCE=y'.
Can be used multiple times to add multiple configs.
Takes precedence over any Buildroot config files.
'''
)
parser.add_argument(
'-c', '--kernel-config-fragment', default=defaults['kernel_config_fragment'], action='append',
help='''Also use the given kernel configuration fragment file.
Pass multiple times to use multiple fragment files.'''
)
parser.add_argument(
'-I', '--initramfs', default=defaults['initramfs'], action='store_true',
)
parser.add_argument(
'-i', '--initrd', default=defaults['initrd'], action='store_true',
)
parser.add_argument(
'-j', '--nproc', default=defaults['nproc'], type=int,
help='Number of processors to use for the build. Default: all.'
)
parser.add_argument(
'-K', '--kernel-custom-config-file', default=defaults['kernel_custom_config_file'],
help='''Ignore all default kernel configurations and use this file instead.
Still uses options explicitly passed with `-C` and `-c` on top of it.'''
)
parser.add_argument(
'-k', '--kernel-modules', default=defaults['kernel_modules'], action='store_true',
help='Reconfigure and rebuild the kernel modules'
)
parser.add_argument(
'-l', '--linux-reconfigure', default=defaults['linux_reconfigure'], action='store_true',
help='''Reconfigure and rebuild the Linux kernel.
Touches kernel configuration files to overcome:
https://stackoverflow.com/questions/49260466/why-when-i-change-br2-linux-kernel-custom-config-file-and-run-make-linux-reconfi'''
)
parser.add_argument(
'--no-all', default=defaults['no_all'], action='store_true',
help='''Don't build the all target which normally gets build by default.
That target builds the root filesystem and all its dependencies.'''
)
parser.add_argument(
'--skip-configure', default=defaults['skip_configure'], action='store_true',
help='''Skip the Buildroot configuration. Saves a few seconds,
but requires you to know what you are doing :-)'''
)
parser.add_argument(
'-v', '--verbose', default=defaults['verbose'], action='store_true',
help='Do a verbose build'
)
parser.add_argument(
'extra_make_args', default=defaults['extra_make_args'], metavar='extra-make-args', nargs='*',
help='''Extra arguments to be passed to the Buildroot make,
usually extra Buildroot targets.'''
)
return parser
def main(args, extra_args=None):
global defaults
args = common.resolve_args(defaults, args, extra_args)
if args.clean:
common.rmrf(common.buildroot_build_dir)
else:
os.makedirs(common.out_dir, exist_ok=True)
extra_make_args = args.extra_make_args.copy()
if args.kernel_modules:
extra_make_args.append('kernel_modules-reconfigure')
if args.linux_reconfigure:
extra_make_args.append('linux-reconfigure')
if args.gem5:
extra_make_args.append('gem5-reconfigure')
if args.nproc is None:
nproc = multiprocessing.cpu_count()
else:
nproc = args.nproc
if args.arch == 'x86_64':
defconfig = 'qemu_x86_64_defconfig'
elif args.arch == 'arm':
defconfig = 'qemu_arm_vexpress_defconfig'
elif args.arch == 'aarch64':
defconfig = 'qemu_aarch64_virt_defconfig'
# Configure.
if not args.skip_configure:
# Initial make configure.
# TODO port and test.
#cd "${common_buildroot_src_dir}"
#for p in $(find "${common_root_dir}/patches/buildroot/" -maxdepth 1 -name '*.patch' -print); do
# patch -N -r - -p 1 < "$p" || :
#done
br2_external_dirs = []
packages_dir = os.path.join(common.root_dir, 'packages')
for package_dir in os.listdir(packages_dir):
package_dir_abs = os.path.join(packages_dir, package_dir)
if os.path.isdir(package_dir_abs):
br2_external_dirs.append(path_relative_to_buildroot(package_dir_abs))
br2_external_str = ':'.join(br2_external_dirs)
subprocess.check_call(
[
'make',
'O={}'.format(common.buildroot_build_dir),
'BR2_EXTERNAL={}'.format(br2_external_str),
defconfig,
],
cwd=common.buildroot_src_dir,
)
buildroot_configs = args.buildroot_config
buildroot_configs.extend([
'BR2_JLEVEL={}'.format(nproc),
'BR2_DL_DIR="{}"'.format(common.dl_dir),
])
write_configs(buildroot_configs)
if not args.baseline:
buildroot_configs.extend([
'BR2_GLOBAL_PATCH_DIR="{}"'.format(
path_relative_to_buildroot(os.path.join(common.root_dir, 'patches', 'global'))),
'BR2_PACKAGE_BUSYBOX_CONFIG_FRAGMENT_FILES="{}"'.format(
path_relative_to_buildroot(os.path.join(common.root_dir, 'busybox_config_fragment'))),
'BR2_PACKAGE_OVERRIDE_FILE="{}"'.format(
path_relative_to_buildroot(os.path.join(common.root_dir, 'buildroot_override'))),
'BR2_ROOTFS_OVERLAY="{}"'.format(
path_relative_to_buildroot(os.path.join(common.root_dir, 'rootfs_overlay'))),
'BR2_ROOTFS_POST_BUILD_SCRIPT="{}"'.format(
path_relative_to_buildroot(os.path.join(common.root_dir, 'rootfs_post_build_script'))),
'BR2_ROOTFS_USERS_TABLES="{}"'.format(
path_relative_to_buildroot(os.path.join(common.root_dir, 'user_table'))),
])
if args.gem5:
buildroot_configs.append('BR2_PACKAGE_GEM5=y')
if args.initramfs:
buildroot_configs.extend([
'BR2_TARGET_ROOTFS_CPIO=n',
'BR2_TARGET_ROOTFS_EXT2=n',
'BR2_TARGET_ROOTFS_INITRAMFS=y',
])
if args.initrd:
buildroot_configs.extend([
'BR2_TARGET_ROOTFS_CPIO=y',
'BR2_TARGET_ROOTFS_EXT2=n'
'BR2_TARGET_ROOTFS_INITRAMFS=n',
])
buildroot_config_fragments = [
os.path.join(common.root_dir, 'buildroot_config', 'default')
] + args.buildroot_config_fragment
# Decide kernel configuration.
kernel_config_fragments = []
if True:
# CLI kernel configurations.
kernel_config_fragment_cli_path = os.path.join(common.buildroot_build_dir, 'lkmc_kernel_config_fragment_cli')
kernel_config_cli_str = '\n'.join(args.kernel_config)
do_write = False
if os.path.exists(kernel_config_fragment_cli_path):
with open(kernel_config_fragment_cli_path, 'r') as kernel_config_fragment_cli_file:
kernel_config_cli_str_old = kernel_config_fragment_cli_file.read()
if kernel_config_cli_str != kernel_config_cli_str_old:
do_write = True
else:
do_write = True
if do_write:
# Only update if modified, otherwise Buildroot tries to
# rebuilds the kernel every time, which takes a few seconds.
# even when the kernel has already been built.
with open(kernel_config_fragment_cli_path, 'w') as kernel_config_fragment_cli_file:
kernel_config_fragment_cli_file.write(kernel_config_cli_str)
kernel_config_fragments.append(os.path.join(kernel_config_fragment_cli_path))
if True:
# Kernel configuration fragments.
if args.kernel_custom_config_file is not None:
if os.path.exists(args.kernel_custom_config_file):
buildroot_configs.extend([
'BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y',
'BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE=\"{}\"'.format(args.kernel_custom_config_file),
])
if args.linux_reconfigure:
pathlib.Path(args.kernel_custom_config_file).touch()
else:
raise Exception('Kernel config fragment file does not exist: {}'.format(args.kernel_custom_config_file))
default_kernel_config_fragments = []
else:
kernel_config_fragment_dir = os.path.join(common.root_dir, 'kernel_config')
default_kernel_config_fragments = ['min', 'default']
if args.linux_reconfigure:
# https://stackoverflow.com/questions/49260466/why-when-i-change-br2-linux-kernel-custom-config-file-and-run-make-linux-reconfi
pathlib.Path(os.path.join(kernel_config_fragment_dir, 'min')).touch()
for i, default_kernel_config_fragment in enumerate(default_kernel_config_fragments):
default_kernel_config_fragments[i] = os.path.join(kernel_config_fragment_dir, default_kernel_config_fragment)
kernel_config_fragments.extend(default_kernel_config_fragments)
for i, frag in enumerate(kernel_config_fragments):
kernel_config_fragments[i] = path_relative_to_buildroot(frag)
buildroot_kernel_config_fragment_str = 'BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="{}"'.format(' '.join(kernel_config_fragments))
buildroot_configs.append(buildroot_kernel_config_fragment_str)
write_configs(buildroot_configs, buildroot_config_fragments)
subprocess.check_call(
[
'make',
'O={}'.format(common.buildroot_build_dir),
'olddefconfig',
],
cwd=common.buildroot_src_dir,
)
# Manage Linux kernel and QEMU variants.
def symlink_buildroot_variant(custom_dir, variant_dir):
if os.path.islink(custom_dir):
os.unlink(custom_dir)
elif os.path.isdir(custom_dir):
# Migration for existing builds.
shutil.move(custom_dir, variant_dir)
os.makedirs(variant_dir, exist_ok=True)
os.symlink(variant_dir, custom_dir)
symlink_buildroot_variant(common.linux_build_dir, common.linux_variant_dir)
# Do the actual build.
common.mkdir()
if not args.no_all:
extra_make_args.append('all')
assert common.run_cmd(
[
'make',
'LKMC_GEM5_SRCDIR="{}"'.format(common.gem5_src_dir),
'LKMC_PARSEC_BENCHMARK_SRCDIR="{}"'.format(common.parsec_benchmark_src_dir),
'O={}'.format(common.buildroot_build_dir),
'V={}'.format(int(args.verbose)),
] +
extra_make_args
,
out_file=os.path.join(common.buildroot_build_dir, 'lkmc.log'),
delete_env=['LD_LIBRARY_PATH'],
cwd=common.buildroot_src_dir,
) == 0
# Create the qcow2 from ext2. This is optional, because gem5
# does not need the qcow2.
if os.path.exists(common.qemu_img_executable) and os.path.exists(common.ext2_file):
assert common.run_cmd([
common.qemu_img_executable,
'-T', 'pr_manager_run,file=/dev/null',
'convert',
'-f', 'raw',
'-O', 'qcow2',
common.ext2_file,
common.qcow2_file,
]) == 0
return 0
def path_relative_to_buildroot(abspath):
return os.path.relpath(abspath, common.buildroot_src_dir)
def write_configs(buildroot_configs, buildroot_config_fragments=None):
"""
Write extra configs into the Buildroot config file.
TODO Can't get rid of these for now with nice fragments:
http://stackoverflow.com/questions/44078245/is-it-possible-to-use-config-fragments-with-buildroots-config
"""
if buildroot_config_fragments is None:
buildroot_config_fragments = []
with open(common.buildroot_config_file, 'a') as br2_config_file:
for buildroot_config_fragment in buildroot_config_fragments:
with open(buildroot_config_fragment, 'r') as br2_config_fragment:
for line in br2_config_fragment:
br2_config_file.write(line)
for buildroot_config in buildroot_configs:
br2_config_file.write(buildroot_config + '\n')
if __name__ == '__main__':
parser = get_argparse()
args = common.setup(parser)
sys.exit(main(args))
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