realtime-setup/realtime-setup-kdump
Clark Williams ffb094355a add SPDX tags
Signed-off-by: Clark Williams <williams@redhat.com>
2023-07-05 18:32:04 -05:00

174 lines
4.2 KiB
Bash

#!/usr/bin/bash
#
# script to update /etc/sysconfig/kdump to use the latest
# kernel package as the dump kernel
#
# optional argument --grub causes kdump kernel cmdline to
# be added to rt kernel grub entries
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
me=$(basename $0)
rpmcmd='rpm -q --last'
function fatal () {
echo "$me: " $1
exit -1
}
function usage () {
echo "usage: $me [-g|--grub] [-r|--rhel] [-v|--verbose] [-h|--help]"
echo " --grub - add crashkernel arg to rt grub entries"
echo " --rhel - use the RHEL-8 kernel as the kdump kernel"
echo " (the default is to use the RHEL-RT kernel)"
echo " --verbose - print out actions"
echo " --help - print this message"
exit -1
}
function report() {
[ $verbose -eq 1 ] && echo $1
}
# return the latest package version of specified package name
function latest_package_ver() {
local pkg=$1
local ver=$($rpmcmd $pkg | head -1 | awk '{print $1}')
if [ $? -ne 0 ]; then
fatal " error fetching version for $pkg"
fi
echo ${ver#$pkg-}
return 0
}
# get the kernel version of hhe latest installed kernel
function vmlinux_ver() {
local ver=$1
local vmver=''
for i in $(cd /boot; echo vmlinuz-*); do
if [ "${i#vmlinuz-$ver}" != "$i" ]; then
vmver=${i#vmlinuz-}
echo $vmver
return 0
fi
done
return 1
}
# find all the grub indexs for installed rhel-rt kernels
# returns a comma-separated list of indices for use
# by the grubby command
function find_rt_kernel_indexes_rhel_rt() {
local awkscript='BEGIN{FS="="; ORS=","} $1 ~ /^index/{idx=$2;}
$2 ~ /.rt.*.el8.x86_64/ &&
$1 ~ /^kernel/ {print idx}'
local rt_idx_list=$(/sbin/grubby --info=ALL | /usr/bin/awk "$awkscript")
echo $rt_idx_list | sed -e 's/,$//'
return 0
}
#############################################################################
# make sure we're root
if [ $(id -u) -ne 0 ]; then
echo " must be root to run $me!"
usage
fi
# process options
dogrub=0
userhel=0
verbose=0
TEMP=$(getopt --options "grvh" --longoptions="grub,rhel,verbose,help" -- "$@")
if [ $? -ne 0 ]; then
usage
fi
eval set -- "$TEMP"
while true; do
case "$1" in
-g|--grub)
dogrub=1
shift
;;
-r|--rhel)
userhel=1
shift
;;
-v|--verbose)
verbose=1
shift
;;
-h|--help)
usage
;;
--) shift ; break ;;
*)
echo "internal error!"
usage
;;
esac
done
# warn if /etc/sysconfig/kdump does not exist
if [ ! -f /etc/sysconfig/kdump ]; then
echo " File /etc/sysconfig/kdump not found."
echo " Please, check your kexec-tools installation."
exit 1
fi
if [ $dogrub = 0 ]; then
echo "Not performing changes to /etc/grub.conf"
echo
# check if there is memory reserved for the kexec kernel
if ! cat /proc/cmdline | grep -e crashkernel > /dev/null; then
echo " Kernel DOES NOT have memory reserved for kdump kernel..."
echo " Use --grub option to enable crashkernel option on kernel command line"
echo
fi
fi
# select the right kdump kernel
if [ $userhel -eq 1 ]; then
KDUMP_KERNEL="kernel"
else
KDUMP_KERNEL="kernel-rt"
fi
# get the version of the latest installed kernel
kver=$(latest_package_ver $KDUMP_KERNEL)
if [ -z "$kver" ]; then
fatal " Can't find $KDUMP_KERNEL package information!"
fi
report " making kernel-$kver the kdump kernel"
# find the vmlinux version info for the latest kernel package
vmlinux_version=$(vmlinux_ver $kver)
if [ -z "$vmlinux_version" ]; then
fatal " Can't get vmlinux version!"
fi
# now edit the /etc/sysconfig/kdump file
sed -e "s/^KDUMP_KERNELVER.*$/KDUMP_KERNELVER=\"$vmlinux_version\"/" \
/etc/sysconfig/kdump >/tmp/kdump.$$
mv /etc/sysconfig/kdump /etc/sysconfig/kdump.save && \
mv /tmp/kdump.$$ /etc/sysconfig/kdump
# if requested, update the grub entries for the rt kernels
if [ $dogrub = 1 ]; then
rtver=$(latest_package_ver kernel-rt)
if [ -z "$rtver" ]; then
fatal " Can't find kernel-rt package information!"
fi
# RHEL-RT kernel
kernels=$(find_rt_kernel_indexes_rhel_rt)
if [ ! -z $kernels ]; then
report " adding 'crashkernel=auto' arg to grub entries: $kernels"
/sbin/grubby --update-kernel=$kernels --args="crashkernel=auto"
fi
fi
exit $?