125 lines
3.1 KiB
Plaintext
125 lines
3.1 KiB
Plaintext
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#!/usr/bin/env python
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"""Build the latest kernel but only if need be"""
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import os
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import shutil
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import subprocess
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EMERGE = os.environ['EMERGE'].split()
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USEPKG = os.environ['USEPKG'].split()
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def get_latest_available_kernel():
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kernel = os.environ['KERNEL']
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package_name = 'sys-kernel/{}'.format(kernel)
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popen = subprocess.Popen(
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['portageq', 'best_visible', '/', package_name],
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stdout=subprocess.PIPE,
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)
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cpv = popen.stdout.read().decode().strip()
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return cpv.rpartition('-')[2]
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def get_current_kernel():
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"""what kernel does /boot/vmlinuz point to"""
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vmlinuz = '/boot/vmlinuz'
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if not os.path.islink(vmlinuz):
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return None
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filename = os.path.basename(os.path.realpath(vmlinuz))
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assert filename.startswith('vmlinuz')
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part_after_vmlinuz = filename[8:]
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# may have "-gentoo" or whatever in the name
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version = part_after_vmlinuz.rpartition('-')[0]
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return version
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def install_kernel_package():
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kernel = os.environ['KERNEL']
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package_name = 'sys-kernel/{}'.format(kernel)
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cmd = EMERGE + USEPKG + ['--oneshot', '--noreplace', package_name]
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subprocess.check_call(cmd)
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def copy_kernel_config():
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filename = '/root/kernel.config'
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shutil.copy(filename, '/usr/src/linux/.config')
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def build_kernel():
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makeopts = os.environ.get('MAKEOPTS', '')
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subprocess.check_call([
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'make', '-C', '/usr/src/linux', 'MAKEOPTS=' + makeopts, 'oldconfig'
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])
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subprocess.check_call([
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'make', '-C', '/usr/src/linux', 'MAKEOPTS=' + makeopts
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])
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def remove_old_kernels():
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kernel_files = ['vmlinuz-', 'System.map-', 'config-']
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for filename in os.listdir('/boot'):
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for kernel_file in kernel_files:
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if filename.startswith(kernel_file):
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path = os.path.join('/boot', filename)
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os.unlink(path)
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if os.path.exists('/boot/vmlinuz'):
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os.unlink('/boot/vmlinuz')
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shutil.rmtree('/lib/modules', ignore_errors=True)
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def install_kernel():
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makeopts = os.environ.get('MAKEOPTS', '')
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subprocess.check_call([
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'make', '-C', '/usr/src/linux', 'MAKEOPTS=' + makeopts, 'install',
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'modules_install'
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])
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# create the symlink. /sbin/installkernel claims this is not used on
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# "modern" distributions and doesn't create it (unless it already
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# exists). I still do this however.
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for filename in os.listdir('/boot'):
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if filename.startswith('vmlinuz-'):
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os.symlink(filename, '/boot/vmlinuz')
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break
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else:
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raise Exception('Could not find installed kernel')
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def uninstall_kernel_package():
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subprocess.check_call([
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'make', '-C', '/usr/src/linux', 'distclean'
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])
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subprocess.check_call(EMERGE + USEPKG + ['--depclean', '--with-bdeps=n'])
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def main():
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latest_kernel = get_latest_available_kernel()
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current_kernel = get_current_kernel()
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if current_kernel == latest_kernel:
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return
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install_kernel_package()
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copy_kernel_config()
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build_kernel()
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remove_old_kernels()
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install_kernel()
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uninstall_kernel_package()
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main()
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