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# # kerneldetection.py # # Copyright 2013 Canonical Ltd. # # Author: Alberto Milone <alberto.milone@canonical.com> # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, # MA 02110-1301, USA. import apt import logging import re from subprocess import Popen class KernelDetection(object): def __init__(self, cache=None): if cache: self.apt_cache = cache else: self.apt_cache = apt.Cache() def _is_greater_than(self, term1, term2): # We don't want to take into account # the flavour pattern = re.compile('(.+)-([0-9]+)-(.+)') match1 = pattern.match(term1) match2 = pattern.match(term2) if match1: term1 = '%s-%s' % (match1.group(1), match1.group(2)) term2 = '%s-%s' % (match2.group(1), match2.group(2)) logging.debug('Comparing %s with %s' % (term1, term2)) command = 'dpkg --compare-versions %s gt %s' % \ (term1, term2) process = Popen(command.split(' ')) process.communicate() return not process.returncode def _find_reverse_dependencies(self, package, prefix): # prefix to restrict the searching # package we want reverse dependencies for deps = set() for pkg in self.apt_cache: if (pkg.name.startswith(prefix) and 'extra' not in pkg.name and pkg.is_installed or pkg.marked_install): dependencies = [] if pkg.candidate: dependencies.extend(pkg.candidate.dependencies) if pkg.installed: dependencies.extend(pkg.installed.dependencies) for ordep in dependencies: for dep in ordep: if dep.rawtype != 'Depends': continue if dep.name == package: deps.add(pkg.name) return list(deps) def _get_linux_flavour(self, candidates, image): pattern = re.compile(r'linux-image-([0-9]+\.[0-9]+\.[0-9]+)-([0-9]+)-(.+)') match = pattern.match(image) flavour = '' if match: flavour = match.group(3) return flavour def _get_linux_metapackage(self, target): '''Get the linux headers, linux-image or linux metapackage''' metapackage = '' image_package = '' version = '' prefix = 'linux-%s' % ('headers' if target == 'headers' else 'image') pattern = re.compile('linux-image-(.+)-([0-9]+)-(.+)') for pkg in self.apt_cache: # We always start with "linux-image" # since installing headers or metapackages # for kernels that are not installed # won't help if (pkg.name.startswith('linux-image') and 'extra' not in pkg.name and self.apt_cache[pkg.name].is_installed or self.apt_cache[pkg.name].marked_install): match = pattern.match(pkg.name) # Here we filter out packages other than # the actual image or header packages if match: current_package = match.group(0) current_version = '%s-%s' % (match.group(1), match.group(2)) # See if the current version is greater than # the greatest that we've found so far if self._is_greater_than(current_version, version): version = current_version image_package = current_package if version: if target == 'headers': target_package = image_package.replace('image', 'headers') else: target_package = image_package reverse_dependencies = self._find_reverse_dependencies(target_package, prefix) if reverse_dependencies: # This should be something like linux-image-$flavour # or linux-headers-$flavour metapackage = '' for candidate in reverse_dependencies: if (candidate.startswith(prefix) and candidate.replace(prefix, '') > metapackage.replace(prefix, '')): metapackage = candidate # if we are looking for headers, then we are good if target == 'meta': # Let's get the metapackage reverse_dependencies = self._find_reverse_dependencies(metapackage, 'linux-') if reverse_dependencies: flavour = self._get_linux_flavour(reverse_dependencies, target_package) linux_meta = '' for meta in reverse_dependencies: # For example linux-generic-hwe-20.04 if meta.startswith('linux-%s-' % (flavour)): linux_meta = meta break # This should be something like linux-$flavour if not linux_meta: # Try the 1st reverse dependency metapackage = reverse_dependencies[0] else: metapackage = linux_meta return metapackage def get_linux_headers_metapackage(self): '''Get the linux headers for the newest_kernel installed''' return self._get_linux_metapackage('headers') def get_linux_image_metapackage(self): '''Get the linux headers for the newest_kernel installed''' return self._get_linux_metapackage('image') def get_linux_metapackage(self): '''Get the linux metapackage for the newest_kernel installed''' return self._get_linux_metapackage('meta') def get_linux_version(self): linux_image_meta = self.get_linux_image_metapackage() linux_version = '' try: dependencies = self.apt_cache[linux_image_meta].candidate.\ record['Depends'] except KeyError: logging.error('No dependencies can be found for %s' % (linux_image_meta)) return None if ', ' in dependencies: deps = dependencies.split(', ') for dep in deps: if dep.startswith('linux-image'): linux_version = dep.replace('linux-image-', '') else: if dependencies.strip().startswith('linux-image'): linux_version = dependencies.strip().replace('linux-image-', '') return linux_version

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