69986be99d
This cleanup patch removes unnecessary keyword "function" at all places in kdumpctl script. Also, corrects couple of typos in the script. Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com> Acked-by: Vivek Goyal <vgoyal@redhat.com>
732 lines
16 KiB
Bash
Executable File
732 lines
16 KiB
Bash
Executable File
#! /bin/sh
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KEXEC=/sbin/kexec
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KDUMP_KERNELVER=""
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KDUMP_COMMANDLINE=""
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KEXEC_ARGS=""
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KDUMP_CONFIG_FILE="/etc/kdump.conf"
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MKDUMPRD="/sbin/mkdumprd -f"
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SAVE_PATH=/var/crash
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SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"
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DUMP_TARGET=""
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. /lib/kdump/kdump-lib.sh
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standard_kexec_args="-p"
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if [ -f /etc/sysconfig/kdump ]; then
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. /etc/sysconfig/kdump
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fi
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single_instance_lock()
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{
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local rc timeout=5
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exec 9>/var/lock/kdump
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flock -n 9
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rc=$?
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while [ $rc -ne 0 ]; do
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echo "Another app is currently holding the kdump lock; waiting for it to exit..."
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flock -w $timeout 9
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rc=$?
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done
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}
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# remove_cmdline_param <kernel cmdline> <param1> [<param2>] ... [<paramN>]
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# Remove a list of kernel parameters from a given kernel cmdline and print the result.
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# For each "arg" in the removing params list, "arg" and "arg=xxx" will be removed if exists.
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remove_cmdline_param()
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{
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local cmdline=$1
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shift
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for arg in $@; do
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cmdline=`echo $cmdline | \
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sed -e "s/\b$arg=[^ ]*\b//g" \
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-e "s/\b$arg\b//g" \
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-e "s/\s\+/ /g"`
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done
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echo $cmdline
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}
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#
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# This function returns the "initial apicid" of the
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# boot cpu (cpu 0) if present.
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#
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get_bootcpu_initial_apicid()
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{
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awk ' \
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BEGIN { CPU = "-1"; } \
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$1=="processor" && $2==":" { CPU = $NF; } \
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CPU=="0" && /initial apicid/ { print $NF; } \
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' \
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/proc/cpuinfo
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}
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#
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# This function appends argument "$2=$3" to string ($1) if not already present.
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#
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append_cmdline()
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{
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local cmdline=$1
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local newstr=${cmdline/$2/""}
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# unchanged str implies argument wasn't there
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if [ "$cmdline" == "$newstr" ]; then
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cmdline="${cmdline} ${2}=${3}"
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fi
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echo $cmdline
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}
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# This function performs a series of edits on the command line
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prepare_cmdline()
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{
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local cmdline;
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if [ -z "$KDUMP_COMMANDLINE" ]; then
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cmdline=`cat /proc/cmdline`
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else
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cmdline=${KDUMP_COMMANDLINE}
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fi
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cmdline=`remove_cmdline_param "$cmdline" crashkernel hugepages hugepagesz`
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cmdline="${cmdline} ${KDUMP_COMMANDLINE_APPEND}"
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local id=`get_bootcpu_initial_apicid`
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if [ ! -z ${id} ] ; then
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cmdline=`append_cmdline "${cmdline}" disable_cpu_apicid ${id}`
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fi
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echo $cmdline
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}
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save_core()
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{
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coredir="/var/crash/`date +"%Y-%m-%d-%H:%M"`"
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mkdir -p $coredir
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cp --sparse=always /proc/vmcore $coredir/vmcore-incomplete
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if [ $? == 0 ]; then
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mv $coredir/vmcore-incomplete $coredir/vmcore
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echo "saved a vmcore to $coredir"
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else
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echo "failed to save a vmcore to $coredir" >&2
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fi
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# pass the dmesg to Abrt tool if exists, in order
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# to collect the kernel oops message.
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# https://fedorahosted.org/abrt/
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if [ -x /usr/bin/dumpoops ]; then
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makedumpfile --dump-dmesg $coredir/vmcore $coredir/dmesg >/dev/null 2>&1
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dumpoops -d $coredir/dmesg >/dev/null 2>&1
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if [ $? == 0 ]; then
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echo "kernel oops has been collected by abrt tool"
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fi
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fi
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}
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rebuild_initrd()
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{
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$MKDUMPRD $kdump_initrd $kdump_kver
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if [ $? != 0 ]; then
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echo "mkdumprd: failed to make kdump initrd" >&2
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return 1
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fi
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}
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#$1: the files to be checked with IFS=' '
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check_exist()
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{
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for file in $1; do
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if [ ! -f "$file" ]; then
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echo -n "Error: $file not found."; echo
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return 1
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fi
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done
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}
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#$1: the files to be checked with IFS=' '
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check_executable()
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{
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for file in $1; do
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if [ ! -x "$file" ]; then
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echo -n "Error: $file is not executable."; echo
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return 1
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fi
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done
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}
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check_config()
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{
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local nr
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nr=$(awk 'BEGIN{cnt=0} /^raw|^ssh[[:blank:]]|^nfs|^ext[234]|^xfs|^btrfs|^minix/{cnt++} END{print cnt}' $KDUMP_CONFIG_FILE)
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[ $nr -gt 1 ] && {
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echo "More than one dump targets specified."
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return 1
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}
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while read config_opt config_val; do
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# remove inline comments after the end of a directive.
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config_val=$(strip_comments $config_val)
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case "$config_opt" in
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\#* | "")
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;;
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raw|ext2|ext3|ext4|minix|btrfs|xfs|nfs|ssh|sshkey|path|core_collector|kdump_post|kdump_pre|extra_bins|extra_modules|default|force_rebuild|dracut_args|fence_kdump_args|fence_kdump_nodes)
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[ -z "$config_val" ] && {
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echo "Invalid kdump config value for option $config_opt."
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return 1;
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}
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;;
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net|options|link_delay|disk_timeout|debug_mem_level|blacklist)
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echo "Deprecated kdump config option: $config_opt. Refer to kdump.conf manpage for alternatives."
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return 1
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;;
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*)
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echo "Invalid kdump config option $config_opt"
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return 1;
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;;
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esac
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done < $KDUMP_CONFIG_FILE
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check_fence_kdump_config || return 1
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return 0
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}
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# get_pcs_cluster_modified_files <image timestamp>
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# return list of modified file for fence_kdump modified in Pacemaker cluster
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get_pcs_cluster_modified_files()
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{
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local image_time=$1
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local time_stamp
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local modified_files
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is_generic_fence_kdump && return 1
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is_pcs_fence_kdump || return 1
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time_stamp=`pcs cluster cib | xmllint --xpath 'string(/cib/@cib-last-written)' - | \
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xargs -0 date +%s --date`
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if [ -n $time_stamp -a $time_stamp -gt $image_time ]; then
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modified_files="cluster-cib"
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fi
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if [ -f $FENCE_KDUMP_CONFIG_FILE ]; then
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time_stamp=`stat -c "%Y" $FENCE_KDUMP_CONFIG_FILE`
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if [ "$time_stamp" -gt "$image_time" ]; then
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modified_files="$modified_files $FENCE_KDUMP_CONFIG_FILE"
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fi
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fi
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echo $modified_files
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}
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check_rebuild()
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{
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local extra_modules modified_files=""
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local _force_rebuild force_rebuild="0"
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if [ -z "$KDUMP_KERNELVER" ]; then
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kdump_kver=`uname -r`
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else
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kdump_kver=$KDUMP_KERNELVER
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fi
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kdump_kernel="${KDUMP_BOOTDIR}/${KDUMP_IMG}-${kdump_kver}${KDUMP_IMG_EXT}"
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kdump_initrd="${KDUMP_BOOTDIR}/initramfs-${kdump_kver}kdump.img"
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_force_rebuild=`grep ^force_rebuild $KDUMP_CONFIG_FILE 2>/dev/null`
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if [ $? -eq 0 ]; then
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force_rebuild=`echo $_force_rebuild | cut -d' ' -f2`
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if [ "$force_rebuild" != "0" ] && [ "$force_rebuild" != "1" ];then
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echo "Error: force_rebuild value is invalid"
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return 1
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fi
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fi
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#will rebuild every time if extra_modules are specified
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extra_modules=`grep ^extra_modules $KDUMP_CONFIG_FILE`
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[ -n "$extra_modules" ] && force_rebuild="1"
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#check to see if dependent files has been modified
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#since last build of the image file
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if [ -f $kdump_initrd ]; then
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image_time=`stat -c "%Y" $kdump_initrd 2>/dev/null`
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else
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image_time=0
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fi
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#also rebuild when Pacemaker cluster conf is changed and fence kdump is enabled.
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modified_files=$(get_pcs_cluster_modified_files $image_time)
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EXTRA_BINS=`grep ^kdump_post $KDUMP_CONFIG_FILE | cut -d\ -f2`
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CHECK_FILES=`grep ^kdump_pre $KDUMP_CONFIG_FILE | cut -d\ -f2`
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EXTRA_BINS="$EXTRA_BINS $CHECK_FILES"
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CHECK_FILES=`grep ^extra_bins $KDUMP_CONFIG_FILE | cut -d\ -f2-`
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EXTRA_BINS="$EXTRA_BINS $CHECK_FILES"
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files="$KDUMP_CONFIG_FILE $kdump_kernel $EXTRA_BINS"
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check_exist "$files" && check_executable "$EXTRA_BINS"
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[ $? -ne 0 ] && return 1
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for file in $files; do
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time_stamp=`stat -c "%Y" $file`
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if [ "$time_stamp" -gt "$image_time" ]; then
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modified_files="$modified_files $file"
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fi
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done
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if [ $image_time -eq 0 ]; then
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echo -n "No kdump initial ramdisk found."; echo
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elif [ "$force_rebuild" != "0" ]; then
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echo -n "Force rebuild $kdump_initrd"; echo
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elif [ -n "$modified_files" ]; then
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echo "Detected change(s) in the following file(s):"
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echo -n " "; echo "$modified_files" | sed 's/\s/\n /g'
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else
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return 0
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fi
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echo "Rebuilding $kdump_initrd"
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rebuild_initrd
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return $?
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}
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# This function check iomem and determines if we have more than
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# 4GB of ram available. Returns 1 if we do, 0 if we dont
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need_64bit_headers()
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{
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return `tail -n 1 /proc/iomem | awk '{ split ($1, r, "-"); \
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print (strtonum("0x" r[2]) > strtonum("0xffffffff")); }'`
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}
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# Load the kdump kerel specified in /etc/sysconfig/kdump
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# If none is specified, try to load a kdump kernel with the same version
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# as the currently running kernel.
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load_kdump()
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{
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MEM_RESERVED=$(cat /sys/kernel/kexec_crash_size)
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if [ $MEM_RESERVED -eq 0 ]
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then
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echo "No memory reserved for crash kernel." >&2
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return 1
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fi
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ARCH=`uname -m`
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if [ "$ARCH" == "i686" -o "$ARCH" == "i386" ]
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then
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need_64bit_headers
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if [ $? == 1 ]
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then
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FOUND_ELF_ARGS=`echo $KEXEC_ARGS | grep elf32-core-headers`
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if [ -n "$FOUND_ELF_ARGS" ]
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then
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echo -n "Warning: elf32-core-headers overrides correct elf64 setting"
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echo
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else
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KEXEC_ARGS="$KEXEC_ARGS --elf64-core-headers"
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fi
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else
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FOUND_ELF_ARGS=`echo $KEXEC_ARGS | grep elf64-core-headers`
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if [ -z "$FOUND_ELF_ARGS" ]
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then
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KEXEC_ARGS="$KEXEC_ARGS --elf32-core-headers"
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fi
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fi
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fi
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KDUMP_COMMANDLINE=`prepare_cmdline`
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$KEXEC $KEXEC_ARGS $standard_kexec_args \
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--command-line="$KDUMP_COMMANDLINE" \
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--initrd=$kdump_initrd $kdump_kernel 2>/dev/null
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if [ $? == 0 ]; then
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echo "kexec: loaded kdump kernel"
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return 0
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else
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echo "kexec: failed to load kdump kernel" >&2
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return 1
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fi
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}
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check_ssh_config()
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{
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while read config_opt config_val; do
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# remove inline comments after the end of a directive.
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config_val=$(strip_comments $config_val)
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case "$config_opt" in
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sshkey)
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if [ -f "$config_val" ]; then
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# canonicalize the path
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SSH_KEY_LOCATION=$(/usr/bin/readlink -m $config_val)
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else
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echo "WARNING: '$config_val' doesn't exist, using default value '$SSH_KEY_LOCATION'"
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fi
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;;
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path)
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SAVE_PATH=$config_val
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;;
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ssh)
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DUMP_TARGET=$config_val
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;;
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*)
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;;
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esac
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done < $KDUMP_CONFIG_FILE
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#make sure they've configured kdump.conf for ssh dumps
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local SSH_TARGET=`echo -n $DUMP_TARGET | sed -n '/.*@/p'`
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if [ -z "$SSH_TARGET" ]; then
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return 1
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fi
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return 0
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}
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check_ssh_target()
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{
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local _ret
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ssh -q -i $SSH_KEY_LOCATION -o BatchMode=yes $DUMP_TARGET mkdir -p $SAVE_PATH
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_ret=$?
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if [ $_ret -ne 0 ]; then
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echo "Could not create $DUMP_TARGET:$SAVE_PATH, you probably need to run \"kdumpctl propagate\"" >&2
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return 1
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fi
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return 0
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}
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propagate_ssh_key()
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{
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check_ssh_config
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if [ $? -ne 0 ]; then
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echo "No ssh config specified in $KDUMP_CONFIG_FILE. Can't propagate" >&2
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exit 1
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fi
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local KEYFILE=$SSH_KEY_LOCATION
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local errmsg="Failed to propagate ssh key"
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#Check to see if we already created key, if not, create it.
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if [ -f $KEYFILE ]; then
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echo "Using existing keys..."
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else
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echo -n "Generating new ssh keys... "
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/usr/bin/ssh-keygen -t rsa -f $KEYFILE -N "" 2>&1 > /dev/null
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echo "done."
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fi
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#now find the target ssh user and server to contact.
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SSH_USER=`echo $DUMP_TARGET | cut -d\ -f2 | cut -d@ -f1`
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SSH_SERVER=`echo $DUMP_TARGET | sed -e's/\(.*@\)\(.*$\)/\2/'`
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#now send the found key to the found server
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ssh-copy-id -i $KEYFILE $SSH_USER@$SSH_SERVER
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RET=$?
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if [ $RET == 0 ]; then
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echo $KEYFILE has been added to ~$SSH_USER/.ssh/authorized_keys on $SSH_SERVER
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return 0
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else
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echo $errmsg, $KEYFILE failed in transfer to $SSH_SERVER >&2
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exit 1
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fi
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}
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check_current_kdump_status()
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{
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rc=`cat /sys/kernel/kexec_crash_loaded`
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if [ $rc == 1 ]; then
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return 0
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else
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return 1
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fi
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}
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save_raw()
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{
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local kdump_dir
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local raw_target
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raw_target=$(awk '$1 ~ /^raw$/ { print $2; }' $KDUMP_CONFIG_FILE)
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[ -z "$raw_target" ] && return 0
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[ -b "$raw_target" ] || {
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echo "raw partition $raw_target not found"
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return 1
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}
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kdump_dir=`grep ^path $KDUMP_CONFIG_FILE | cut -d' ' -f2-`
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if [ -z "${kdump_dir}" ]; then
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coredir="/var/crash/`date +"%Y-%m-%d-%H:%M"`"
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else
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coredir="${kdump_dir}/`date +"%Y-%m-%d-%H:%M"`"
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fi
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mkdir -p "$coredir"
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[ -d "$coredir" ] || {
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echo "failed to create $coredir"
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return 1
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}
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if makedumpfile -R $coredir/vmcore <$raw_target >/dev/null 2>&1; then
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# dump found
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echo "Dump saved to $coredir/vmcore"
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# wipe makedumpfile header
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dd if=/dev/zero of=$raw_target bs=1b count=1 2>/dev/null
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else
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rm -rf "$coredir"
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fi
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return 0
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}
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get_save_path()
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{
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local _save_path=$(grep "^path" /etc/kdump.conf|awk '{print $2}')
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if [ -z "$_save_path" ]; then
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_save_path="/var/crash"
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fi
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echo $_save_path
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}
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is_dump_target_configured()
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{
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local _target
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_target=$(egrep "^ext[234]|^xfs|^btrfs|^minix|^raw|^ssh|^nfs" /etc/kdump.conf)
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[ -n "$_target" ]
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}
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local_fs_dump_target()
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{
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local _target
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_target=$(egrep "^ext[234]|^xfs|^btrfs|^minix" /etc/kdump.conf)
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if [ $? -eq 0 ]; then
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echo $_target|awk '{print $2}'
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fi
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}
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path_to_be_relabeled()
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{
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local _path _target _mnt="/" _rmnt
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if is_dump_target_configured; then
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_target=$(local_fs_dump_target)
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if [[ -n "$_target" ]]; then
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_mnt=$(findmnt -k -f -n -r -o TARGET $_target)
|
|
if [ -z "$_mnt" ]; then
|
|
return
|
|
fi
|
|
else
|
|
return
|
|
fi
|
|
fi
|
|
|
|
_path=$(get_save_path)
|
|
# if $_path is masked by other mount, we will not relabel it.
|
|
_rmnt=$(df $_mnt/$_path 2>/dev/null | tail -1 | awk '{ print $NF }')
|
|
if [ "$_rmnt" == "$_mnt" ]; then
|
|
echo $_mnt/$_path
|
|
fi
|
|
}
|
|
|
|
selinux_relabel()
|
|
{
|
|
local _path _i _attr
|
|
|
|
_path=$(path_to_be_relabeled)
|
|
if [ -z "$_path" ] || ! [ -d "$_path" ] ; then
|
|
return
|
|
fi
|
|
|
|
for _i in $(find $_path); do
|
|
_attr=$(getfattr -m "security.selinux" $_i 2>/dev/null)
|
|
if [ -z "$_attr" ]; then
|
|
restorecon $_i;
|
|
fi
|
|
done
|
|
}
|
|
|
|
# Check if secure boot is being enforced.
|
|
#
|
|
# Per Peter Jones, we need check efivar SecureBoot-$(the UUID) and
|
|
# SetupMode-$(the UUID), they are both 5 bytes binary data. The first four
|
|
# bytes are the attributes associated with the variable and can safely be
|
|
# ignored, the last bytes are one-byte true-or-false variables. If SecureBoot
|
|
# is 1 and SetupMode is 0, then secure boot is being enforced.
|
|
#
|
|
# Assume efivars is mounted at /sys/firmware/efi/efivars.
|
|
is_secure_boot_enforced()
|
|
{
|
|
local secure_boot_file setup_mode_file
|
|
local secure_boot_byte setup_mode_byte
|
|
|
|
secure_boot_file=$(find /sys/firmware/efi/efivars -name SecureBoot-* 2>/dev/null)
|
|
setup_mode_file=$(find /sys/firmware/efi/efivars -name SetupMode-* 2>/dev/null)
|
|
|
|
if [ -f "$secure_boot_file" ] && [ -f "$setup_mode_file" ]; then
|
|
secure_boot_byte=$(hexdump -v -e '/1 "%d\ "' $secure_boot_file|cut -d' ' -f 5)
|
|
setup_mode_byte=$(hexdump -v -e '/1 "%d\ "' $setup_mode_file|cut -d' ' -f 5)
|
|
|
|
if [ "$secure_boot_byte" = "1" ] && [ "$setup_mode_byte" = "0" ]; then
|
|
return 0
|
|
fi
|
|
fi
|
|
|
|
return 1
|
|
}
|
|
|
|
check_kdump_feasibility()
|
|
{
|
|
if is_secure_boot_enforced; then
|
|
echo "Secure Boot is Enabled. Kdump service can't be started. Disable Secure Boot and retry"
|
|
return 1;
|
|
fi
|
|
|
|
if [ ! -e /sys/kernel/kexec_crash_loaded ]; then
|
|
echo "Kdump is not supported on this kernel"
|
|
return 1
|
|
fi
|
|
}
|
|
|
|
check_fence_kdump_config()
|
|
{
|
|
local hostname=`hostname`
|
|
local nodes=$(get_option_value "fence_kdump_nodes")
|
|
|
|
for node in $nodes; do
|
|
if [ "$node" = "$hostname" ]; then
|
|
echo "Option fence_kdump_nodes cannot contain $hostname"
|
|
return 1
|
|
fi
|
|
done
|
|
|
|
return 0
|
|
}
|
|
|
|
start()
|
|
{
|
|
check_config
|
|
if [ $? -ne 0 ]; then
|
|
echo "Starting kdump: [FAILED]"
|
|
return 1
|
|
fi
|
|
|
|
if sestatus 2>/dev/null | grep -q "SELinux status.*enabled"; then
|
|
selinux_relabel
|
|
fi
|
|
save_raw
|
|
if [ $? -ne 0 ]; then
|
|
echo "Starting kdump: [FAILED]"
|
|
return 1
|
|
fi
|
|
|
|
check_kdump_feasibility
|
|
if [ $? -ne 0 ]; then
|
|
echo "Starting kdump: [FAILED]"
|
|
return 1
|
|
fi
|
|
|
|
check_current_kdump_status
|
|
if [ $? == 0 ]; then
|
|
echo "Kdump already running: [WARNING]"
|
|
return 0
|
|
fi
|
|
|
|
if check_ssh_config; then
|
|
if ! check_ssh_target; then
|
|
echo "Starting kdump: [FAILED]"
|
|
return 1
|
|
fi
|
|
fi
|
|
|
|
check_rebuild
|
|
if [ $? != 0 ]; then
|
|
echo "Starting kdump: [FAILED]"
|
|
return 1
|
|
fi
|
|
load_kdump
|
|
if [ $? != 0 ]; then
|
|
echo "Starting kdump: [FAILED]"
|
|
return 1
|
|
fi
|
|
|
|
echo "Starting kdump: [OK]"
|
|
}
|
|
|
|
stop()
|
|
{
|
|
$KEXEC -p -u 2>/dev/null
|
|
if [ $? == 0 ]; then
|
|
echo "kexec: unloaded kdump kernel"
|
|
echo "Stopping kdump: [OK]"
|
|
return 0
|
|
else
|
|
echo "kexec: failed to unload kdump kernel"
|
|
echo "Stopping kdump: [FAILED]"
|
|
return 1
|
|
fi
|
|
}
|
|
|
|
if [ ! -f "$KDUMP_CONFIG_FILE" ]; then
|
|
echo "Error: No kdump config file found!" >&2
|
|
exit 1
|
|
fi
|
|
|
|
main ()
|
|
{
|
|
case "$1" in
|
|
start)
|
|
if [ -s /proc/vmcore ]; then
|
|
save_core
|
|
reboot
|
|
else
|
|
start
|
|
fi
|
|
;;
|
|
stop)
|
|
stop
|
|
;;
|
|
status)
|
|
EXIT_CODE=0
|
|
check_current_kdump_status
|
|
case "$?" in
|
|
0)
|
|
echo "Kdump is operational"
|
|
EXIT_CODE=0
|
|
;;
|
|
1)
|
|
echo "Kdump is not operational"
|
|
EXIT_CODE=3
|
|
;;
|
|
esac
|
|
exit $EXIT_CODE
|
|
;;
|
|
restart)
|
|
stop
|
|
start
|
|
;;
|
|
condrestart)
|
|
;;
|
|
propagate)
|
|
propagate_ssh_key
|
|
;;
|
|
*)
|
|
echo $"Usage: $0 {start|stop|status|restart|propagate}"
|
|
exit 1
|
|
esac
|
|
}
|
|
|
|
# Other kdumpctl instances will block in queue, until this one exits
|
|
single_instance_lock
|
|
|
|
# To avoid fd 9 leaking, we invoke a subshell, close fd 9 and call main.
|
|
# So that fd isn't leaking when main is invoking a subshell.
|
|
(exec 9<&-; main $1)
|
|
|
|
exit $?
|