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