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#!/usr/bin/python3
"""
Remove old kernels.
"""
import sys
import platform
import os
import re
from subprocess import check_call
def get_version(name):
return re.search('(\d+\.\d+\.\d+-\d+)', name).group(1)
def get_sortable_version(name):
numbers = filter(None, re.split('\D+', name))
return tuple(int(n) for n in numbers)
def get_kernel_package_names(version):
return [
'linux-headers-{}'.format(version),
'linux-headers-{}-generic'.format(version),
'linux-image-{}-generic'.format(version),
'linux-image-extra-{}-generic'.format(version),
]
release = platform.uname().release
assert release.endswith('-generic')
current = get_version(release)
print('Running kernel is {!r}'.format(current))
kernels = []
for name in os.listdir('/boot'):
if name.startswith('vmlinuz-'):
kernels.append(get_version(name))
assert current in kernels
kernels.sort(key=get_sortable_version)
print('Installed kernels:', kernels)
remove = []
for version in kernels:
if version == current:
break
remove.extend(get_kernel_package_names(version))
if not remove:
print('No old kernels to remove')
sys.exit(0)
cmd = ['sudo', 'apt-get', '-y', 'purge'] + remove
print('Command:', cmd)
check_call(cmd)
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