#!/bin/bash

# FIXME: replace calls to this complex and buggy script with much

# simpler calls to `journalctl -k` which has a slightly different (but

# customizable) format; a few extra messages and most importantly: never

# rotates and never loses the first 'Linux version' line.

# dump the kernel information from target

last_order=${1:-0}

# check whether parameter 1 has the Non-Number

[[ "${last_order//[0-9]/}" ]] && echo "$0 parameter 1 just support +N number, N start from 0" && builtin exit 1

last_order=$[ $last_order + 1 ]

log_file=${2:-"/var/log/kern.log"}

# check whether target file exists

[[ ! -f "$log_file" ]] && echo "$0 parameter 2 $log_file does not exist" && builtin exit 1

# load helper script

which sof-get-kernel-line.sh 2>&1 1>/dev/null

if [ $? -eq 0 ]; then

kernel_line_script="sof-get-kernel-line.sh"

else

cd $(dirname $0)

kernel_line_script=$PWD/sof-get-kernel-line.sh

cd $OLDPWD

fi

declare -a line_lst

# here line lst to keep 2 value, [0] is target line, [1] is end line

# if target is last one, so will cut content form [0] -> file end

# if target is second last, so will cut content from [0] -> [1]

line_lst=($($kernel_line_script $log_file|tail -n $last_order|awk '{print $1;}'))

# sof-get-kernel-line.sh dump nothing

[[ ! "${line_lst[0]}" ]] && echo "$0 without catch system boot keyword" && builtin exit 1

# check target is last one

if [ ! "${line_lst[1]}" ];then

# tr '\0' ' ' to fix warning message: "command substitution: ignored null byte in input"

tail -n +${line_lst[0]} $log_file|tr '\0' ' '|cut -f5- -d ' '

else

line_count=$[ ${line_lst[1]} - ${line_lst[0]} ]

# tr '\0' ' ' to fix warning message: "command substitution: ignored null byte in input"

tail -n +${line_lst[0]} $log_file|tr '\0' ' '|head -n $line_count|cut -f5- -d ' '

fi