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#!/usr/bin/env python
#
# Kernel.py: this file is part of the GRS suite
# Copyright (C) 2015 Anthony G. Basile
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
import os
import re
import shutil
from grs.Constants import CONST
from grs.Execute import Execute
class Kernel():
""" Build a linux-image pkg and install when building a system. """
def __init__(
self, libdir=CONST.LIBDIR, portage_configroot=CONST.PORTAGE_CONFIGROOT,
kernelroot=CONST.KERNELROOT, package=CONST.PACKAGE, logfile=CONST.LOGFILE
):
self.libdir = libdir
self.portage_configroot = portage_configroot
self.kernelroot = kernelroot
self.package = package
self.logfile = logfile
self.kernel_config = os.path.join(self.libdir, 'scripts/kernel-config')
def parse_kernel_config(self):
""" Parse the version to be built/installed from the kernel-config file. """
with open(self.kernel_config, 'r') as _file:
lines = _file.readlines()
# Are we building a modular kernel or statically linked?
has_modules = 'CONFIG_MODULES=y\n' in lines
# The third line is the version line in the kernel config file.
version_line = lines[2]
# The version line looks like the following:
# Linux/x86 4.0.6-hardened-r2 Kernel Configuration
# The 2nd group contains the version.
_match = re.search(r'^#\s+(\S+)\s+(\S+).+$', version_line)
gentoo_version = _match.group(2)
try:
# Either the verison is of the form '4.0.6-hardened-r2' with two -'s
_match = re.search(r'(\S+?)-(\S+?)-(\S+)', gentoo_version)
vanilla_version = _match.group(1)
flavor = _match.group(2)
revision = _match.group(3)
pkg_name = flavor + '-sources-' + vanilla_version + '-' + revision
except AttributeError:
# Or the verison is of the form '4.0.6-hardened' with one -
_match = re.search(r'(\S+?)-(\S+)', gentoo_version)
vanilla_version = _match.group(1)
flavor = _match.group(2)
pkg_name = flavor + '-sources-' + vanilla_version
pkg_name = '=sys-kernel/' + pkg_name
return (gentoo_version, pkg_name, has_modules)
def kernel(self, arch='x86_64'):
""" This emerges the kernel sources to a directory outside of the
fledgeling system's portage configroot, builds and installs it
to yet another external directory, bundles the kernel and modules
as a .tar.xz in the packages directory for downloads via grsup,
and finally installs it to the system's portage configroot.
"""
# Grab the parsed verison and pkg atom.
(gentoo_version, pkg_name, has_modules) = self.parse_kernel_config()
# Prepare the paths to where we'll emerge and build the kernel,
# as well as paths for genkernel.
kernel_source = os.path.join(self.kernelroot, 'usr/src/linux')
image_dir = os.path.join(self.kernelroot, gentoo_version)
boot_dir = os.path.join(image_dir, 'boot')
modprobe_dir = os.path.join(image_dir, 'etc/modprobe.d')
modules_dir = os.path.join(image_dir, 'lib/modules')
# Prepare tarball filename and path. If the tarball already exists,
# don't rebuild/reinstall it. Note: It should have been installed to
# the system's portage configroot when it was first built, so no need
# to reinstall it.
linux_images = os.path.join(self.package, 'linux-images')
tarball_name = 'linux-image-%s.tar.xz' % gentoo_version
tarball_path = os.path.join(linux_images, tarball_name)
if os.path.isfile(tarball_path):
return
# Remove any old kernel image directory and create a boot directory.
# Note genkernel assumes a boot directory is present.
shutil.rmtree(image_dir, ignore_errors=True)
os.makedirs(boot_dir, mode=0o755, exist_ok=True)
# emerge the kernel source.
cmd = 'emerge --nodeps -1n %s' % pkg_name
emerge_env = {'USE' : 'symlink', 'ROOT' : self.kernelroot, 'ACCEPT_KEYWORDS' : '**'}
Execute(cmd, timeout=600, extra_env=emerge_env, logfile=self.logfile)
# Build and install the image outside the portage configroot so
# we can both rsync it in *and* tarball it for downloads via grsup.
# NOTE: more options (eg splash and firmware), can be specified
# via the kernel line in the build script.
cmd = 'genkernel '
cmd += '--logfile=/dev/null '
cmd += '--no-save-config '
cmd += '--makeopts=-j9 '
cmd += '--no-firmware '
cmd += '--symlink '
cmd += '--no-mountboot '
cmd += '--kernel-config=%s ' % self.kernel_config
cmd += '--kerneldir=%s ' % kernel_source
cmd += '--bootdir=%s ' % boot_dir
cmd += '--module-prefix=%s ' % image_dir
cmd += '--modprobedir=%s ' % modprobe_dir
cmd += '--arch-override=%s ' % arch
if has_modules:
cmd += 'all'
else:
cmd += 'bzImage'
Execute(cmd, timeout=None, logfile=self.logfile)
# Strip the modules to shrink their size enormously!
# This will do nothing if there is not modules_dir
for dirpath, dirnames, filenames in os.walk(modules_dir):
for filename in filenames:
if filename.endswith('.ko'):
module = os.path.join(dirpath, filename)
cmd = 'objcopy -v --strip-unneeded %s' % module
Execute(cmd)
# Copy the newly compiled kernel image and modules to portage configroot
cmd = 'rsync -aK %s/ %s' % (image_dir, self.portage_configroot)
Execute(cmd, timeout=60, logfile=self.logfile)
# Tar up the kernel image and modules and place them in package/linux-images
os.makedirs(linux_images, mode=0o755, exist_ok=True)
cwd = os.getcwd()
os.chdir(image_dir)
cmd = 'tar -Jcf %s .' % tarball_path
Execute(cmd, timeout=600, logfile=self.logfile)
os.chdir(cwd)
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