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#!/usr/bin/env python
#
# Netboot.py: this file is part of the GRS suite
# Copyright (C) 2017 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 shutil
from datetime import datetime
from grs.Constants import CONST
from grs.Execute import Execute
from grs.HashIt import HashIt
class Netboot(HashIt):
""" Create a Netboot image of the system. """
def __init__(
self,
name,
libdir=CONST.LIBDIR,
tmpdir=CONST.TMPDIR,
portage_configroot=CONST.PORTAGE_CONFIGROOT,
kernelroot=CONST.KERNELROOT,
logfile=CONST.LOGFILE
):
self.libdir = libdir
self.tmpdir = tmpdir
self.portage_configroot = portage_configroot
self.kernelroot = kernelroot
self.logfile = logfile
# Prepare a year, month and day for a name timestamp.
self.year = str(datetime.now().year).zfill(4)
self.month = str(datetime.now().month).zfill(2)
self.day = str(datetime.now().day).zfill(2)
self.medium_name = 'initramfs-%s-%s%s%s' % (name, self.year, self.month, self.day)
self.digest_name = '%s.DIGESTS' % self.medium_name
self.kernelname = 'kernel-%s-%s%s%s' % (name, self.year, self.month, self.day)
def netbootit(self, alt_name=None):
""" TODO """
if alt_name:
self.medium_name = 'initramfs-%s-%s%s%s' % (alt_name, self.year, self.month, self.day)
self.digest_name = '%s.DIGESTS' % self.medium_name
# 1. Copy the kernel to the tmpdir directory.
kernel_src = os.path.join(self.portage_configroot, 'boot/kernel')
kernel_dst = os.path.join(self.tmpdir, self.kernelname)
shutil.copy(kernel_src, kernel_dst)
# 2. Unpack the initramfs into kernelroot/initramfs direcotry
initramfs_root = os.path.join(self.kernelroot, 'initramfs')
shutil.rmtree(initramfs_root, ignore_errors=True)
os.makedirs(initramfs_root, mode=0o755, exist_ok=False)
# We will only use xz compression
initramfs_src = os.path.join(self.portage_configroot, 'boot/initramfs')
cmd = 'xz -dc %s | cpio -idv' % (initramfs_src)
cwd = os.getcwd()
os.chdir(initramfs_root)
Execute(cmd, timeout=600, logfile=self.logfile, shell=True)
os.chdir(cwd)
# 2.5 Don't trust genkernel's busybox, but copy in our own version
# built in the system chroot. This ensures it will work on the
# target system.
# TODO: We need to make sure that we've linked busybox staticly.
busybox_src = os.path.join(self.portage_configroot, 'bin/busybox')
busybox_dst = os.path.join(self.kernelroot, 'initramfs/bin/busybox')
shutil.copy(busybox_src, busybox_dst)
# 3. Make the squashfs image in the tmpdir directory.
squashfs_dir = os.path.join(initramfs_root, 'mnt/cdrom')
shutil.rmtree(squashfs_dir, ignore_errors=True)
os.makedirs(squashfs_dir, mode=0o755, exist_ok=False)
squashfs_path = os.path.join(squashfs_dir, 'image.squashfs')
cmd = 'mksquashfs %s %s -xattrs -comp xz' % (self.portage_configroot, squashfs_path)
Execute(cmd, timeout=None, logfile=self.logfile)
# 4. Copy in the init script
init_src = os.path.join(self.libdir, 'scripts/init')
init_dst = os.path.join(initramfs_root, 'init')
shutil.copy(init_src, init_dst)
os.chmod(init_dst, 0o0755)
# 5. Repack
initramfs_dst = os.path.join(self.tmpdir, self.medium_name)
cmd = 'find . -print | cpio -H newc -o | xz -9e --check=none -z -f > %s' % initramfs_dst
cwd = os.getcwd()
os.chdir(initramfs_root)
Execute(cmd, timeout=600, logfile=self.logfile, shell=True)
os.chdir(cwd)
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