#!/usr/bin/env python3 import multiprocessing import os import pathlib import shutil import subprocess import sys import time import re import common class BuildrootComponent(common.Component): def add_parser_arguments(self, parser): parser.add_argument( '-B', '--buildroot-config', default=self._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=self._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( '--build-linux', default=self._defaults['build_linux'], action='store_true', help='''\ Enable building the Linux kernel with Buildroot. This is done mostly to extract Buildroot's default kernel configurations when updating Buildroot. That kernel will not be use by our scripts. ''' ) parser.add_argument( '--baseline', default=self._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=self._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=self._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=self._defaults['initramfs'], action='store_true', ) parser.add_argument( '-i', '--initrd', default=self._defaults['initrd'], action='store_true', ) parser.add_argument( '-j', '--nproc', default=self._defaults['nproc'], type=int, help='Number of processors to use for the build. Default: all.' ) parser.add_argument( '-K', '--kernel-custom-config-file', default=self._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=self._defaults['kernel_modules'], action='store_true', help='''Reconfigure and rebuild the kernel modules package. Force --build-linux to true, since building the modules requires building Linux. ''' ) parser.add_argument( '--no-all', default=self._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=self._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( 'extra_make_args', default=self._defaults['extra_make_args'], metavar='extra-make-args', nargs='*', help='''\ Extra arguments to be passed to the Buildroot make, usually extra Buildroot targets. ''' ) def do_build(self, args): build_dir = self.get_build_dir(args) os.makedirs(common.out_dir, exist_ok=True) extra_make_args = args.extra_make_args.copy() if args.kernel_modules: args.build_linux = True extra_make_args.append('lkmc-reconfigure') if args.build_linux: 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: 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(self._path_relative_to_buildroot(package_dir_abs)) br2_external_str = ':'.join(br2_external_dirs) common.run_cmd( [ '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.buildroot_download_dir), ]) common.write_configs(common.buildroot_config_file, buildroot_configs) if not args.build_linux: buildroot_configs.extend([ '# BR2_LINUX_KERNEL is not set', ]) if not args.baseline: buildroot_configs.extend([ 'BR2_GLOBAL_PATCH_DIR="{}"'.format( self._path_relative_to_buildroot(os.path.join(common.root_dir, 'patches', 'global')) ), 'BR2_PACKAGE_BUSYBOX_CONFIG_FRAGMENT_FILES="{}"'.format( self._path_relative_to_buildroot(os.path.join(common.root_dir, 'busybox_config_fragment')) ), 'BR2_PACKAGE_OVERRIDE_FILE="{}"'.format( self._path_relative_to_buildroot(os.path.join(common.root_dir, 'buildroot_override')) ), 'BR2_ROOTFS_OVERLAY="{} {}"'.format( self._path_relative_to_buildroot(common.rootfs_overlay_dir), self._path_relative_to_buildroot(common.out_rootfs_overlay_dir), ), 'BR2_ROOTFS_POST_BUILD_SCRIPT="{}"'.format( self._path_relative_to_buildroot(os.path.join(common.root_dir, 'rootfs-post-build-script')) ), 'BR2_ROOTFS_USERS_TABLES="{}"'.format( self._path_relative_to_buildroot(os.path.join(common.root_dir, 'user_table')) ), ]) if args.kernel_modules: buildroot_configs.append('BR2_PACKAGE_LKMC=y') 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.build_linux: 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: default_kernel_config_fragments = ['min', 'default'] if args.build_linux: # 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(common.linux_config_dir, 'min')).touch() for i, default_kernel_config_fragment in enumerate(default_kernel_config_fragments): default_kernel_config_fragments[i] = os.path.join(common.linux_config_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] = self._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) common.write_configs(common.buildroot_config_file, buildroot_configs, buildroot_config_fragments) common.run_cmd( [ 'make', 'O={}'.format(common.buildroot_build_dir), 'olddefconfig', ], cwd=common.buildroot_src_dir, ) # Do the actual build. common.make_build_dirs() if not args.no_all: extra_make_args.append('all') 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, ) # Create the qcow2 from ext2. # Skip if qemu is not present, because gem5 does not need the qcow2. # so we don't force a QEMU build for gem5. if not args.no_all and os.path.exists(common.qemu_img_executable): common.raw_to_qcow2() def get_argparse_args(self): return { 'description': '''\ Run Linux on an emulator ''' } def get_build_dir(self, args): return common.buildroot_build_dir _defaults = { 'baseline': False, 'build_linux': False, 'buildroot_config': [], 'buildroot_config_fragment': [], 'initramfs': False, 'initrd': False, 'kernel_config': [], 'kernel_config_fragment': [], 'kernel_custom_config_file': None, 'kernel_modules': False, 'no_all': False, 'nproc': None, 'skip_configure': False, 'extra_make_args': [], } def _path_relative_to_buildroot(self, abspath): return os.path.relpath(abspath, common.buildroot_src_dir) if __name__ == '__main__': BuildrootComponent().build()