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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)
self.cd_name = '%s-%s%s%s.iso' % (name, self.year, self.month, self.day)
def netbootit(self, do_cd=None, 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 use gzip compression
initramfs_src = os.path.join(self.portage_configroot, 'boot/initramfs')
cmd = 'cat %s | gunzip | cpio -idv' % (initramfs_src)
cwd = os.getcwd()
os.chdir(initramfs_root)
Execute(cmd, timeout=600, logfile=self.logfile, shell=True)
os.chdir(cwd)
''' The issue here was that busybox was build in the host env like the
kernel and that means that we are using the host's ARCH and the cpuflags
which are now poluting the initramfs. The better approach to building
a kernel and initramfs is to drop the Kernel.py module altogether and
emerge genkernel in the fledgeling system via the script directive, set
genkernel.conf via the populate directive and then just run genkernel.
# 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 gzip' % (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.netboot')
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 | gzip -9 -f > %s' % initramfs_dst
cwd = os.getcwd()
os.chdir(initramfs_root)
Execute(cmd, timeout=600, logfile=self.logfile, shell=True)
os.chdir(cwd)
# 6. If do_cd='cd' then we package a bootable CD image
# TODO: This code is rushed and we need a better way of
# locating the tarball
if do_cd == 'cd':
# TODO: Before a regular release, we'll have to fix this path
tarball_path = '/usr/share/grs-9999/ISO-1.tar.gz'
cmd = 'tar --xattrs -xf %s -C %s' % (tarball_path, self.kernelroot)
Execute(cmd, timeout=120, logfile=self.logfile)
# Note: we are copying the netboot kernel and initramfs into
# the ISO directory, so the kernel_dst and initramfs_dst above
# are the sources for these files
iso_dir = os.path.join(self.kernelroot, 'ISO')
isolinux_dir = os.path.join(iso_dir, 'isolinux')
shutil.copy(kernel_dst, '%s/kernel' % (isolinux_dir))
shutil.copy(initramfs_dst, '%s/initrd' % (isolinux_dir))
# Note gentoo.efimg and isolinux.bin are in the ISO tarball
# isolinux.bin comes from sys-boot/syslinux
# gentoo.efimg is created using
# 1) dd if=/dev/zero of=gentoo.efimg bs=1k count=16k
# 2) mkfs.vfat -F 16 -n GENTOO gentoo.efimg
# gentoo.efimg contains ./EFI/BOOT/BOOTX64.EFI
# BOOTX64.EFI is created using
# 1) mount -o loop gentoo.efimg zzz
# 2) mkdir -p zzz/EFI/BOOT/
# 3) grub-mkstandalone /boot/grub/grub.cfg=grub-stub.cfg --compress=xz -O x86_64-efi -o zzz/EFI/BOOT/BOOTX64.EFI
# 4) umount zzz
# Here grub-stub.cfg contains the following lines
# search --no-floppy --set=root --file /grub/grub.cfg
# configfile /grub/grub.cfg
args = '-J -R -z ' # Joliet/Rock Ridge/RRIP
args += '-b isolinux/isolinux.bin ' # Use isolinux boot
args += '-c isolinux/boot.cat ' # Create the catalog file
args += '-no-emul-boot ' # No disk emulation for El Torito
args += '-boot-load-size 4 ' # 4x512-bit sectors for no-emulation mode
args += '-boot-info-table ' # Create El Torito boot info table
args += '-eltorito-alt-boot ' # Add an alternative boot entry
args += '-eltorito-platform efi ' # The additional boot entry is EFI
args += '-b gentoo.efimg ' # Use EFI boot
args += '-no-emul-boot ' # No disk emulation for El Torito
cd_path = os.path.join(self.tmpdir, self.cd_name)
cmd = 'mkisofs %s -o %s %s' % (args, cd_path, iso_dir)
Execute(cmd, timeout=None, logfile=self.logfile)
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