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482 lines
12 KiB
482 lines
12 KiB
#!/bin/bash --norc
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# New mkdumprd
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#
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# Copyright 2011 Red Hat, Inc.
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#
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# Written by Cong Wang <amwang@redhat.com>
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#
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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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[[ $dracutbasedir ]] || dracutbasedir=/usr/lib/dracut
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. $dracutbasedir/dracut-functions.sh
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. /lib/kdump/kdump-lib.sh
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. /lib/kdump/kdump-logger.sh
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export IN_KDUMP=1
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#initiate the kdump logger
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if ! dlog_init; then
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echo "failed to initiate the kdump logger."
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exit 1
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fi
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SSH_KEY_LOCATION="/root/.ssh/kdump_id_rsa"
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SAVE_PATH=$(get_save_path)
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OVERRIDE_RESETTABLE=0
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extra_modules=""
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dracut_args=(--add kdumpbase --quiet --hostonly --hostonly-cmdline --hostonly-i18n --hostonly-mode strict --hostonly-nics '' -o "plymouth resume ifcfg earlykdump")
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MKDUMPRD_TMPDIR="$(mktemp -d -t mkdumprd.XXXXXX)"
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[ -d "$MKDUMPRD_TMPDIR" ] || perror_exit "dracut: mktemp -p -d -t dracut.XXXXXX failed."
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MKDUMPRD_TMPMNT="$MKDUMPRD_TMPDIR/target"
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trap '
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ret=$?;
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is_mounted $MKDUMPRD_TMPMNT && umount -f $MKDUMPRD_TMPMNT;
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[[ -d $MKDUMPRD_TMPDIR ]] && rm --one-file-system -rf -- "$MKDUMPRD_TMPDIR";
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exit $ret;
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' EXIT
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# clean up after ourselves no matter how we die.
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trap 'exit 1;' SIGINT
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add_dracut_arg()
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{
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dracut_args+=("$@")
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}
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add_dracut_mount()
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{
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add_dracut_arg "--mount" "$1"
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}
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add_dracut_sshkey()
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{
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add_dracut_arg "--sshkey" "$1"
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}
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# caller should ensure $1 is valid and mounted in 1st kernel
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to_mount()
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{
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local _target=$1 _fstype=$2 _options=$3 _sed_cmd _new_mntpoint _pdev
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_new_mntpoint=$(get_kdump_mntpoint_from_target "$_target")
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_fstype="${_fstype:-$(get_fs_type_from_target "$_target")}"
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_options="${_options:-$(get_mntopt_from_target "$_target")}"
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_options="${_options:-defaults}"
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if [[ $_fstype == "nfs"* ]]; then
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_pdev=$_target
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_sed_cmd+='s/,\(mount\)\?addr=[^,]*//g;'
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_sed_cmd+='s/,\(mount\)\?proto=[^,]*//g;'
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_sed_cmd+='s/,clientaddr=[^,]*//;'
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else
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# for non-nfs _target converting to use udev persistent name
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_pdev="$(kdump_get_persistent_dev "$_target")"
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if [[ -z $_pdev ]]; then
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return 1
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fi
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fi
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# mount fs target as rw in 2nd kernel
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_sed_cmd+='s/\(^\|,\)ro\($\|,\)/\1rw\2/g;'
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# with 'noauto' in fstab nfs and non-root disk mount will fail in 2nd
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# kernel, filter it out here.
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_sed_cmd+='s/\(^\|,\)noauto\($\|,\)/\1/g;'
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# drop nofail or nobootwait
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_sed_cmd+='s/\(^\|,\)nofail\($\|,\)/\1/g;'
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_sed_cmd+='s/\(^\|,\)nobootwait\($\|,\)/\1/g;'
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_options=$(echo "$_options" | sed "$_sed_cmd")
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echo "$_pdev $_new_mntpoint $_fstype $_options"
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}
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#Function: get_ssh_size
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#$1=dump target
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#called from while loop and shouldn't read from stdin, so we're using "ssh -n"
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get_ssh_size()
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{
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local _out
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local _opt=("-i" "$SSH_KEY_LOCATION" "-o" "BatchMode=yes" "-o" "StrictHostKeyChecking=yes")
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if ! _out=$(ssh -q -n "${_opt[@]}" "$1" "df" "--output=avail" "$SAVE_PATH"); then
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perror_exit "checking remote ssh server available size failed."
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fi
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echo -n "$_out" | tail -1
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}
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#mkdir if save path does not exist on ssh dump target
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#$1=ssh dump target
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#caller should ensure write permission on $1:$SAVE_PATH
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#called from while loop and shouldn't read from stdin, so we're using "ssh -n"
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mkdir_save_path_ssh()
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{
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local _opt _dir
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_opt=(-i "$SSH_KEY_LOCATION" -o BatchMode=yes -o StrictHostKeyChecking=yes)
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ssh -qn "${_opt[@]}" "$1" mkdir -p "$SAVE_PATH" &> /dev/null ||
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perror_exit "mkdir failed on $1:$SAVE_PATH"
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# check whether user has write permission on $1:$SAVE_PATH
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_dir=$(ssh -qn "${_opt[@]}" "$1" mktemp -dqp "$SAVE_PATH" 2> /dev/null) ||
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perror_exit "Could not create temporary directory on $1:$SAVE_PATH. Make sure user has write permission on destination"
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ssh -qn "${_opt[@]}" "$1" rmdir "$_dir"
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return 0
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}
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#Function: get_fs_size
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#$1=dump target
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get_fs_size()
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{
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df --output=avail "$(get_mntpoint_from_target "$1")/$SAVE_PATH" | tail -1
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}
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#Function: get_raw_size
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#$1=dump target
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get_raw_size()
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{
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fdisk -s "$1"
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}
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#Function: check_size
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#$1: dump type string ('raw', 'fs', 'ssh')
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#$2: dump target
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check_size()
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{
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local avail memtotal
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memtotal=$(awk '/MemTotal/{print $2}' /proc/meminfo)
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case "$1" in
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raw)
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avail=$(get_raw_size "$2")
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;;
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ssh)
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avail=$(get_ssh_size "$2")
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;;
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fs)
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avail=$(get_fs_size "$2")
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;;
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*)
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return
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;;
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esac || perror_exit "Check dump target size failed"
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if [[ $avail -lt $memtotal ]]; then
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dwarn "Warning: There might not be enough space to save a vmcore."
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dwarn " The size of $2 should be greater than $memtotal kilo bytes."
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fi
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}
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check_save_path_fs()
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{
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local _path=$1
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if [[ ! -d $_path ]]; then
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perror_exit "Dump path $_path does not exist."
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fi
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}
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mount_failure()
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{
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local _target=$1
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local _mnt=$2
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local _fstype=$3
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local msg="Failed to mount $_target"
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if [[ -n $_mnt ]]; then
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msg="$msg on $_mnt"
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fi
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msg="$msg for kdump preflight check."
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if [[ $_fstype == "nfs" ]]; then
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msg="$msg Please make sure nfs-utils has been installed."
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fi
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perror_exit "$msg"
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}
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check_user_configured_target()
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{
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local _target=$1 _cfg_fs_type=$2 _mounted
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local _mnt _opt _fstype
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_mnt=$(get_mntpoint_from_target "$_target")
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_opt=$(get_mntopt_from_target "$_target")
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_fstype=$(get_fs_type_from_target "$_target")
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if [[ -n $_fstype ]]; then
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# In case of nfs4, nfs should be used instead, nfs* options is deprecated in kdump.conf
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[[ $_fstype == "nfs"* ]] && _fstype=nfs
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if [[ -n $_cfg_fs_type ]] && [[ $_fstype != "$_cfg_fs_type" ]]; then
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perror_exit "\"$_target\" have a wrong type config \"$_cfg_fs_type\", expected \"$_fstype\""
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fi
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else
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_fstype="$_cfg_fs_type"
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_fstype="$_cfg_fs_type"
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fi
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# For noauto mount, mount it inplace with default value.
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# Else use the temporary target directory
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if [[ -n $_mnt ]]; then
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if ! is_mounted "$_mnt"; then
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if [[ $_opt == *",noauto"* ]]; then
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mount "$_mnt" || mount_failure "$_target" "$_mnt" "$_fstype"
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_mounted=$_mnt
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else
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perror_exit "Dump target \"$_target\" is neither mounted nor configured as \"noauto\""
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fi
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fi
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else
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_mnt=$MKDUMPRD_TMPMNT
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mkdir -p "$_mnt"
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mount "$_target" "$_mnt" -t "$_fstype" -o defaults || mount_failure "$_target" "" "$_fstype"
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_mounted=$_mnt
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fi
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# For user configured target, use $SAVE_PATH as the dump path within the target
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if [[ ! -d "$_mnt/$SAVE_PATH" ]]; then
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perror_exit "Dump path \"$SAVE_PATH\" does not exist in dump target \"$_target\""
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fi
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check_size fs "$_target"
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# Unmount it early, if function is interrupted and didn't reach here, the shell trap will clear it up anyway
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if [[ -n $_mounted ]]; then
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umount -f -- "$_mounted"
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fi
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}
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# $1: core_collector config value
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verify_core_collector()
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{
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local _cmd="${1%% *}"
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local _params="${1#${_cmd}}"
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if [[ $_cmd != "makedumpfile" ]]; then
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if is_raw_dump_target; then
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dwarn "Warning: specifying a non-makedumpfile core collector, you will have to recover the vmcore manually."
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fi
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return
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fi
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if is_ssh_dump_target || is_raw_dump_target; then
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if ! strstr "$_params" "-F"; then
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perror_exit 'The specified dump target needs makedumpfile "-F" option.'
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fi
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_params="$_params vmcore"
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else
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_params="$_params vmcore dumpfile"
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fi
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# shellcheck disable=SC2086
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if ! $_cmd --check-params $_params; then
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perror_exit "makedumpfile parameter check failed."
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fi
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}
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add_mount()
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{
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local _mnt
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_mnt=$(to_mount "$@") || exit 1
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add_dracut_mount "$_mnt"
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}
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#handle the case user does not specify the dump target explicitly
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handle_default_dump_target()
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{
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local _target
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local _mntpoint
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is_user_configured_dump_target && return
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check_save_path_fs "$SAVE_PATH"
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_save_path=$(get_bind_mount_source "$SAVE_PATH")
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_target=$(get_target_from_path "$_save_path")
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_mntpoint=$(get_mntpoint_from_target "$_target")
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SAVE_PATH=${_save_path##"$_mntpoint"}
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add_mount "$_target"
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check_size fs "$_target"
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}
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# $1: function name
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for_each_block_target()
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{
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local dev majmin
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for dev in $(get_kdump_targets); do
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[[ -b $dev ]] || continue
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majmin=$(get_maj_min "$dev")
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check_block_and_slaves "$1" "$majmin" && return 1
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done
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return 0
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}
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#judge if a specific device with $1 is unresettable
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#return false if unresettable.
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is_unresettable()
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{
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local path device resettable=1
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path="/sys/$(udevadm info --query=all --path="/sys/dev/block/$1" | awk '/^P:/ {print $2}' | sed -e 's/\(cciss[0-9]\+\/\).*/\1/g' -e 's/\/block\/.*$//')/resettable"
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if [[ -f $path ]]; then
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resettable="$(< "$path")"
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[[ $resettable -eq 0 ]] && [[ $OVERRIDE_RESETTABLE -eq 0 ]] && {
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device=$(udevadm info --query=all --path="/sys/dev/block/$1" | awk -F= '/DEVNAME/{print $2}')
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derror "Error: Can not save vmcore because device $device is unresettable"
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return 0
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}
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fi
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return 1
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}
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#check if machine is resettable.
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#return true if resettable
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check_resettable()
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{
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local _target _override_resettable
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_override_resettable=$(kdump_get_conf_val override_resettable)
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OVERRIDE_RESETTABLE=${_override_resettable:-$OVERRIDE_RESETTABLE}
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if [ "$OVERRIDE_RESETTABLE" != "0" ] && [ "$OVERRIDE_RESETTABLE" != "1" ]; then
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perror_exit "override_resettable value '$OVERRIDE_RESETTABLE' is invalid"
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fi
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for_each_block_target is_unresettable && return
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return 1
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}
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check_crypt()
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{
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local _dev
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for _dev in $(get_kdump_targets); do
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if [[ -n $(get_luks_crypt_dev "$(get_maj_min "$_dev")") ]]; then
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derror "Device $_dev is encrypted." && return 1
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fi
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done
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}
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if ! check_resettable; then
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exit 1
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fi
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if ! check_crypt; then
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dwarn "Warning: Encrypted device is in dump path, which is not recommended, see kexec-kdump-howto.txt for more details."
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fi
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# firstly get right SSH_KEY_LOCATION
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keyfile=$(kdump_get_conf_val sshkey)
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if [[ -f $keyfile ]]; then
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# canonicalize the path
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SSH_KEY_LOCATION=$(/usr/bin/readlink -m "$keyfile")
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fi
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while read -r config_opt config_val; do
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# remove inline comments after the end of a directive.
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case "$config_opt" in
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extra_modules)
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extra_modules="$extra_modules $config_val"
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;;
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ext[234] | xfs | btrfs | minix | nfs | virtiofs)
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check_user_configured_target "$config_val" "$config_opt"
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add_mount "$config_val" "$config_opt"
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;;
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raw)
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# checking raw disk writable
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dd if="$config_val" count=1 of=/dev/null > /dev/null 2>&1 || {
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perror_exit "Bad raw disk $config_val"
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}
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_praw=$(persistent_policy="by-id" kdump_get_persistent_dev "$config_val")
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if [[ -z $_praw ]]; then
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exit 1
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fi
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add_dracut_arg "--device" "$_praw"
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check_size raw "$config_val"
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;;
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ssh)
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if strstr "$config_val" "@"; then
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mkdir_save_path_ssh "$config_val"
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check_size ssh "$config_val"
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add_dracut_sshkey "$SSH_KEY_LOCATION"
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else
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perror_exit "Bad ssh dump target $config_val"
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fi
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;;
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core_collector)
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verify_core_collector "$config_val"
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;;
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dracut_args)
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# When users specify nfs dumping via dracut_args, kexec-tools won't
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# mount nfs fs beforehand thus nfsv4-related drivers won't be installed
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# because we call dracut with --hostonly-mode strict. So manually install
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# nfsv4-related drivers.
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if [[ $(get_dracut_args_fstype "$config_val") == nfs* ]]; then
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add_dracut_arg "--add-drivers" nfs_layout_nfsv41_files
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fi
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while read -r dracut_arg; do
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add_dracut_arg "$dracut_arg"
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done <<< "$(echo "$config_val" | xargs -n 1 echo)"
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;;
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*) ;;
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esac
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done <<< "$(kdump_read_conf)"
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handle_default_dump_target
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if ! have_compression_in_dracut_args; then
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if is_squash_available && dracut_have_option "--squash-compressor"; then
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add_dracut_arg "--squash-compressor" "zstd"
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elif is_zstd_command_available; then
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add_dracut_arg "--compress" "zstd"
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fi
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fi
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if [[ -n $extra_modules ]]; then
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add_dracut_arg "--add-drivers" "$extra_modules"
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fi
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# TODO: The below check is not needed anymore with the introduction of
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# 'zz-fadumpinit' module, that isolates fadump's capture kernel initrd,
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# but still sysroot.mount unit gets generated based on 'root=' kernel
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# parameter available in fadump case. So, find a way to fix that first
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# before removing this check.
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if ! is_fadump_capable; then
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# The 2nd rootfs mount stays behind the normal dump target mount,
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# so it doesn't affect the logic of check_dump_fs_modified().
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is_dump_to_rootfs && add_mount "$(to_dev_name "$(get_root_fs_device)")"
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add_dracut_arg "--no-hostonly-default-device"
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if fips-mode-setup --is-enabled 2> /dev/null; then
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add_dracut_arg --add-device "$(findmnt -n -o SOURCE --target /boot)"
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fi
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fi
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# This is RHEL-only to work around nvme problem, then real fix should go to dracut
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if [[ -d /sys/module/nvme ]]; then
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add_dracut_arg "--add-drivers" "nvme"
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fi
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dracut "${dracut_args[@]}" "$@"
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_rc=$?
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sync
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exit $_rc
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