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"""
Wrapper for Grub operations
"""
# -*- coding: utf-8 -*-
#
# grub.py
#
# Copyright 2015 Neil Williams <codehelp@debian.org>
#
# 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/>.
# pylint: disable=missing-docstring,duplicate-code
import os
import cliapp
import logging
from vmdebootstrap.base import (
Base,
runcmd,
mount_wrapper,
umount_wrapper
)
from vmdebootstrap.uefi import arch_table
def grub_serial_console(rootdir):
cmdline = 'GRUB_CMDLINE_LINUX_DEFAULT="console=tty0 console=tty1 console=ttyS0,38400n8"'
terminal = 'GRUB_TERMINAL="serial gfxterm"'
command = 'GRUB_SERIAL_COMMAND="serial --speed=38400 --unit=0 --parity=no --stop=1"'
grub_cfg = os.path.join(rootdir, 'etc', 'default', 'grub')
logging.debug("Allowing serial output in grub config %s", grub_cfg)
with open(grub_cfg, 'a+') as cfg:
cfg.write("# %s serial support\n" % os.path.basename(__file__))
cfg.write("%s\n" % cmdline)
cfg.write("%s\n" % terminal)
cfg.write("%s\n" % command)
def link_uuid(rootdev):
"""
This is mainly to fix a problem in update-grub where /etc/grub.d/10_linux
Checks if the $GRUB_DEVICE_UUID exists in /dev/disk/by-uuid and falls
back to $GRUB_DEVICE if it doesn't.
$GRUB_DEVICE is /dev/mapper/loopXpY (on docker)
Creating the symlink ensures that grub consistently uses
$GRUB_DEVICE_UUID when creating /boot/grub/grub.cfg
"""
if os.path.exists('/.dockerenv'):
logging.info("Running in docker container")
runcmd(['mkdir', '-p', '/dev/disk/by-uuid'])
uuid = runcmd(['blkid', '-c', '/dev/null', '-o', 'value', '-s', 'UUID', rootdev])
uuid = uuid.splitlines()[0].strip()
os.symlink(rootdev, os.path.join('/dev/disk/by-uuid', uuid))
def unlink_uuid(rootdev):
"""
Reset the link created with link_uuid.
"""
if os.path.exists('/.dockerenv'):
uuid = runcmd(['blkid', '-c', '/dev/null', '-o', 'value', '-s', 'UUID', rootdev])
uuid = uuid.splitlines()[0].strip()
os.remove(os.path.join('/dev/disk/by-uuid', uuid))
class GrubHandler(Base):
name = 'grub'
def __init__(self):
super(GrubHandler, self).__init__()
def install_grub2(self, rootdev, rootdir):
self.message("Configuring grub2")
# rely on kpartx using consistent naming to map loop0p1 to loop0
grub_opts = os.path.join('/dev', os.path.basename(rootdev)[:-2])
if self.settings['serial-console']:
grub_serial_console(rootdir)
logging.debug("Running grub-install with options: %s", grub_opts)
mount_wrapper(rootdir)
link_uuid(rootdev)
try:
runcmd(['chroot', rootdir, 'update-grub'])
runcmd(['chroot', rootdir, 'grub-install', grub_opts])
except cliapp.AppException as exc:
logging.warning(exc)
self.message("Failed. Is grub2-common installed? Using extlinux.")
umount_wrapper(rootdir)
return False
unlink_uuid(rootdev)
umount_wrapper(rootdir)
return True
def install_grub_uefi(self, rootdir):
ret = True
self.message("Configuring grub-uefi")
target = arch_table[self.settings['arch']]['target']
grub_opts = "--target=%s" % target
logging.debug("Running grub-install with options: %s", grub_opts)
mount_wrapper(rootdir)
try:
runcmd(['chroot', rootdir, 'update-grub'])
runcmd(['chroot', rootdir, 'grub-install', grub_opts])
except cliapp.AppException as exc:
logging.warning(exc)
ret = False
self.message(
"Failed to configure grub-uefi for %s" %
self.settings['arch'])
finally:
umount_wrapper(rootdir)
if not ret:
raise cliapp.AppException("Failed to install grub uefi")
def install_extra_grub_uefi(self, rootdir):
ret = True
extra = arch_table[self.settings['arch']]['extra']
if extra:
logging.debug("Installing extra grub support for %s", extra)
mount_wrapper(rootdir)
target = arch_table[extra]['target']
grub_opts = "--target=%s" % target
self.message("Adding grub target %s" % grub_opts)
try:
runcmd(['chroot', rootdir, 'update-grub'])
runcmd(['chroot', rootdir, 'grub-install', grub_opts])
except cliapp.AppException as exc:
logging.warning(exc)
ret = False
self.message(
"Failed to configure grub-uefi for %s" % extra)
finally:
umount_wrapper(rootdir)
if not ret:
raise cliapp.AppException("Failed to install extra grub uefi")
def grub_packages(self):
if self.settings['grub'] and not self.settings['use-uefi']:
return ['grub-pc']
return []
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