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