117 lines
4 KiB
Python
Executable file
117 lines
4 KiB
Python
Executable file
#!/usr/bin/env python3
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import argparse
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import os
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import shutil
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import subprocess
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import sys
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from pathlib import Path
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SRC_DIR = Path('/usr/src')
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BOOT_DIR = Path('/boot')
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def update_config(old_dir: Path, new_dir: Path, make_cmd: list[str]) -> None:
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if old_dir == new_dir:
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return
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old_config = old_dir / '.config'
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new_config = new_dir / '.config'
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while new_config.is_file():
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response = input('New config present. Overwrite? [y/N]\n').strip().lower()
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if response == 'y':
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break
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elif response in ('', 'n'):
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return
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else:
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print('unrecognized option {}', response)
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print(f'Copying config from {old_config} to {new_config}')
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shutil.copy2(old_config, new_config)
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print(f'Setting symlink to {new_dir}')
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new_symlink = SRC_DIR / 'linux.updated'
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new_symlink.symlink_to(new_dir, target_is_directory=True)
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new_symlink.rename(SRC_DIR / 'linux')
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print('Migrating config options')
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migrate = [*make_cmd, '--directory', new_dir.as_posix(), 'oldconfig']
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subprocess.run(migrate, check=True)
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menuconfig = [*make_cmd, '--directory', new_dir.as_posix(), 'menuconfig']
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while True:
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subprocess.run(menuconfig, check=True)
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response = input('Stop editing? [Y/n]').strip().lower()
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if response in ('', 'y'):
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break
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elif response == 'n':
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continue
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else:
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print('unrecognized option {}', response)
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def compile_kernel(new_dir: Path, make_cmd: list[str]) -> None:
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cc = [*make_cmd, '--directory', new_dir.as_posix()]
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subprocess.run(cc, check=True)
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def install_kernel(kernel_dir: Path, make_cmd: list[str], kver: str) -> None:
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install_modules = [*make_cmd, '--directory', kernel_dir.as_posix(), 'modules_install']
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subprocess.run(install_modules, check=True)
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kver = kver[6:] # drop "linux-" prefix
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# assumes proper dracut config in /etc, incl. signing keys
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dracut = ['dracut', f'--kver={kver}', '--force', '--no-machineid']
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res = subprocess.run(dracut, check=True)
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print(res)
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def linux_folder(src_dir: Path, version: str) -> Path:
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revision = ''
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version = version.split('-')
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if len(version) > 1:
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revision = '-' + version[1]
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version = version[0]
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return src_dir / (f'linux-{version}-gentoo{revision}')
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def update_kernel(args: argparse.Namespace) -> None:
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old_dir = linux_folder(SRC_DIR, args.old_version)
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new_dir = linux_folder(SRC_DIR, args.new_version)
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new_version = new_dir.name
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make_cmd = ['make', f'--jobs={len(os.sched_getaffinity(0))}']
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if args.llvm:
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# https://docs.kernel.org/kbuild/llvm.html
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make_cmd.extend(['LLVM=1'])
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none_selected = not any((args.config, args.compile, args.install))
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if none_selected:
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update_config(old_dir, new_dir, make_cmd)
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compile_kernel(new_dir, make_cmd)
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install_kernel(new_dir, make_cmd, new_version)
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if args.config:
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update_config(old_dir, new_dir, make_cmd)
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if args.compile:
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compile_kernel(new_dir, make_cmd)
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if args.install:
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install_kernel(new_dir, make_cmd, new_version)
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def main() -> None:
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parser = argparse.ArgumentParser(description='Helper for manual kernel updates', usage=f'{sys.argv[0]}')
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parser.add_argument('--llvm', '-l', action='store_true', help='Use clang/llvm to compile kernel')
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parser.add_argument('--config', '-C', action='store_true', help='Migrate config from old kernel')
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parser.add_argument('--compile', '-c', action='store_true', help='Compile new kernel')
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parser.add_argument('--install', '-i', action='store_true', help='Install new kernel')
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parser.add_argument('old_version', help='Old kernel version (optional)', nargs='?', default=None)
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parser.add_argument('new_version', help='New kernel version (optional)', nargs='?', default=None)
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args = parser.parse_args()
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if args.old_version and not args.new_version:
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args.new_version = args.old_version
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args.old_version = None
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if not args.old_version:
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args.old_version = (SRC_DIR / 'linux').readlink().name.split('-')[1]
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if not args.new_version:
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subdirs = Path(SRC_DIR).glob('linux-*-gentoo*') # too broad but good enough, blame fnmatch
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args.new_version = sorted(subdir.name for subdir in subdirs if subdir.is_dir())[-1].split('-')[1]
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update_kernel(args)
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if __name__ == '__main__':
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main()
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