124 lines
4.5 KiB
Python
124 lines
4.5 KiB
Python
|
# kexec.py
|
||
|
|
#
|
||
|
|
# Setup kexec to restart the system using the default bootloader entry
|
||
|
|
#
|
||
|
|
# Copyright (C) 2015 Red Hat, Inc.
|
||
|
|
#
|
||
|
|
# This copyrighted material is made available to anyone wishing to use,
|
||
|
|
# modify, copy, or redistribute it subject to the terms and conditions of
|
||
|
|
# the GNU General Public License v.2, or (at your option) any later version.
|
||
|
|
# This program is distributed in the hope that it will be useful, but WITHOUT
|
||
|
|
# ANY WARRANTY expressed or implied, including the implied warranties 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. Any Red Hat trademarks that are incorporated in the
|
||
|
|
# source code or documentation are not subject to the GNU General Public
|
||
|
|
# License and may only be used or replicated with the express permission of
|
||
|
|
# Red Hat, Inc.
|
||
|
|
#
|
||
|
|
import shutil
|
||
|
|
import shlex
|
||
|
|
|
||
|
|
from collections import namedtuple
|
||
|
|
|
||
|
|
from pyanaconda.anaconda_loggers import get_module_logger
|
||
|
|
from pyanaconda.core.configuration.anaconda import conf
|
||
|
|
from pyanaconda.core.util import execReadlines, execWithRedirect
|
||
|
|
|
||
|
|
log = get_module_logger(__name__)
|
||
|
|
|
||
|
|
|
||
|
|
class GrubbyInfoError(Exception):
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
def unquote(s):
|
||
|
|
return ' '.join(shlex.split(s))
|
||
|
|
|
||
|
|
|
||
|
|
def run_grubby(args=None):
|
||
|
|
""" Run grubby and retrieve the kernel, initrd and boot arguments
|
||
|
|
|
||
|
|
:param list args: Arguments to pass to grubby.
|
||
|
|
:returns: kernel path, initrd path, root device, kernel cmdline args.
|
||
|
|
:rtype: namedtuple
|
||
|
|
:raises: some error on failure
|
||
|
|
|
||
|
|
The returned namedtuple contains the following attributes:
|
||
|
|
kernel, initrd, root, args
|
||
|
|
"""
|
||
|
|
boot_info_fields = ["kernel", "initrd", "root", "args"]
|
||
|
|
boot_info_class = namedtuple("BootInfo", boot_info_fields)
|
||
|
|
boot_info_args = {}
|
||
|
|
|
||
|
|
if not args:
|
||
|
|
args = ["--info", "DEFAULT"]
|
||
|
|
|
||
|
|
# Run grubby and fill in the boot_info with the first values seen, exit the
|
||
|
|
# loop when all of the needed values have been gathered.
|
||
|
|
try:
|
||
|
|
|
||
|
|
for line in execReadlines("grubby", args, root=conf.target.system_root):
|
||
|
|
key, _sep, value = line.partition("=")
|
||
|
|
value = unquote(value)
|
||
|
|
|
||
|
|
if key in boot_info_fields:
|
||
|
|
boot_info_args[key] = value
|
||
|
|
boot_info_fields.remove(key)
|
||
|
|
|
||
|
|
if not boot_info_fields:
|
||
|
|
break
|
||
|
|
except OSError as e:
|
||
|
|
log.error("run_grubby failed: %s", e)
|
||
|
|
raise GrubbyInfoError(e) from e
|
||
|
|
|
||
|
|
if boot_info_fields:
|
||
|
|
raise GrubbyInfoError("Missing values: %s" % ", ".join(boot_info_fields))
|
||
|
|
|
||
|
|
# There could be multiple initrd images defined for a boot entry, but
|
||
|
|
# the kexec command line tool only supports passing a single initrd.
|
||
|
|
if "initrd" in boot_info_args:
|
||
|
|
boot_info_args["initrd"] = boot_info_args["initrd"].split(" ")[0]
|
||
|
|
|
||
|
|
boot_info = boot_info_class(**boot_info_args)
|
||
|
|
log.info("grubby boot info for (%s): %s", args, boot_info)
|
||
|
|
return boot_info
|
||
|
|
|
||
|
|
|
||
|
|
def setup_kexec():
|
||
|
|
""" Setup kexec to use the new kernel and default bootloader entry
|
||
|
|
|
||
|
|
This uses grubby to determine the bootloader arguments from the default entry,
|
||
|
|
and then sets up kexec so that reboot will use the new kernel and initrd instead
|
||
|
|
of doing a full reboot.
|
||
|
|
|
||
|
|
.. note::
|
||
|
|
Once kexec is called there is nothing else to do, the reboot code already handles
|
||
|
|
having kexec setup.
|
||
|
|
"""
|
||
|
|
try:
|
||
|
|
boot_info = run_grubby()
|
||
|
|
except GrubbyInfoError:
|
||
|
|
# grubby couldn't find a default entry, use the first one instead
|
||
|
|
try:
|
||
|
|
boot_info = run_grubby(["--info", "ALL"])
|
||
|
|
except GrubbyInfoError:
|
||
|
|
# Grubby can't get the bootloader's info, kexec won't work.
|
||
|
|
log.error("kexec reboot setup failed, grubby could not get bootloader info.")
|
||
|
|
return
|
||
|
|
|
||
|
|
# Copy the kernel and initrd to /tmp/
|
||
|
|
shutil.copy2(conf.target.system_root + boot_info.kernel, "/tmp/vmlinuz-kexec-reboot")
|
||
|
|
shutil.copy2(conf.target.system_root + boot_info.initrd, "/tmp/initrd-kexec-reboot")
|
||
|
|
|
||
|
|
append = "root=%s %s" % (boot_info.root, boot_info.args)
|
||
|
|
args = ["--initrd", "/tmp/initrd-kexec-reboot", "--append", append, "-l", "/tmp/vmlinuz-kexec-reboot"]
|
||
|
|
try:
|
||
|
|
rc = execWithRedirect("kexec", args)
|
||
|
|
except OSError as e:
|
||
|
|
log.error("setup_kexec failed: %s", e)
|
||
|
|
if rc != 0:
|
||
|
|
log.error("setup_kexec failed with rc=%d: See program.log for output", rc)
|