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kdump-logger.sh: make it POSIX compatible 

upstream: fedora
resolves: bz2003832
conflict: none

commit 8cd57e5565142553b1fe739afe90723359b18498
Author: Kairui Song <kasong@redhat.com>
Date:   Wed Aug 11 19:19:59 2021 +0800

    kdump-logger.sh: make it POSIX compatible

    Refactor to remove some bash only syntax.

    Signed-off-by: Kairui Song <kasong@redhat.com>
    Acked-by: Philipp Rudo <prudo@redhat.com>

Signed-off-by: Tao Liu <ltao@redhat.com>
This commit is contained in:
Tao Liu 2021-11-03 19:35:20 +08:00
parent d53e0655f1
commit f0d3575138
1 changed files with 61 additions and 56 deletions
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117
kdump-logger.sh
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@ -1,4 +1,4 @@
#!/bin/bash
#!/bin/sh
#
# This comes from the dracut-logger.sh
#
@ -53,11 +53,12 @@ fi
#
get_kdump_loglvl()
{
(type -p getarg) && kdump_sysloglvl=$(getarg rd.kdumploglvl)
[ -f /lib/dracut-lib.sh ] && kdump_sysloglvl=$(getarg rd.kdumploglvl)
[ -z "$kdump_sysloglvl" ] && return 1;
(type -p isdigit) && isdigit $kdump_sysloglvl
[ $? -ne 0 ] && return 1;
if [ -f /lib/dracut-lib.sh ] && ! isdigit "$kdump_sysloglvl"; then
return 1
fi
return 0
}
@ -83,11 +84,10 @@ check_loglvl()
# @retval 0 on success.
#
dlog_init() {
local ret=0; local errmsg
ret=0
if [ -s /proc/vmcore ];then
get_kdump_loglvl
if [ $? -ne 0 ];then
if ! get_kdump_loglvl; then
logger -t "kdump[$$]" -p warn -- "Kdump is using the default log level(3)."
kdump_sysloglvl=3
fi
@ -104,8 +104,7 @@ dlog_init() {
[ -z "$kdump_kmsgloglvl" ] && kdump_kmsgloglvl=0
for loglvl in "$kdump_stdloglvl" "$kdump_kmsgloglvl" "$kdump_sysloglvl"; do
check_loglvl "$loglvl"
if [ $? -ne 0 ]; then
if ! check_loglvl "$loglvl"; then
echo "Illegal log level: $kdump_stdloglvl $kdump_kmsgloglvl $kdump_sysloglvl"
return 1
fi
@ -114,21 +113,21 @@ dlog_init() {
# Skip initialization if it's already done.
[ -n "$kdump_maxloglvl" ] && return 0
if [[ $UID -ne 0 ]]; then
if [ "$UID" -ne 0 ]; then
kdump_kmsgloglvl=0
kdump_sysloglvl=0
fi
if [[ $kdump_sysloglvl -gt 0 ]]; then
if [[ -d /run/systemd/journal ]] \
&& type -P systemd-cat &>/dev/null \
&& systemctl --quiet is-active systemd-journald.socket &>/dev/null; then
if [ "$kdump_sysloglvl" -gt 0 ]; then
if [ -d /run/systemd/journal ] \
&& systemd-cat --version 1>/dev/null 2>&1 \
&& systemctl --quiet is-active systemd-journald.socket 1>/dev/null 2>&1; then
readonly _systemdcatfile="/var/tmp/systemd-cat"
mkfifo "$_systemdcatfile" &>/dev/null
mkfifo "$_systemdcatfile" 1>/dev/null 2>&1
readonly _dlogfd=15
systemd-cat -t 'kdump' --level-prefix=true <"$_systemdcatfile" &
exec 15>"$_systemdcatfile"
elif ! [ -S /dev/log -a -w /dev/log ] || ! command -v logger >/dev/null; then
elif ! [ -S /dev/log ] && [ -w /dev/log ] || ! command -v logger >/dev/null; then
# We cannot log to syslog, so turn this facility off.
kdump_kmsgloglvl=$kdump_sysloglvl
kdump_sysloglvl=0
@ -137,31 +136,31 @@ dlog_init() {
fi
fi
local lvl; local maxloglvl_l=0
for lvl in $kdump_stdloglvl $kdump_sysloglvl $kdump_kmsgloglvl; do
[[ $lvl -gt $maxloglvl_l ]] && maxloglvl_l=$lvl
kdump_maxloglvl=0
for _dlog_lvl in $kdump_stdloglvl $kdump_sysloglvl $kdump_kmsgloglvl; do
[ $_dlog_lvl -gt $kdump_maxloglvl ] && kdump_maxloglvl=$_dlog_lvl
done
readonly kdump_maxloglvl=$maxloglvl_l
readonly kdump_maxloglvl
export kdump_maxloglvl
if [[ $kdump_stdloglvl -lt 4 ]] && [[ $kdump_kmsgloglvl -lt 4 ]] && [[ $kdump_sysloglvl -lt 4 ]]; then
if [ $kdump_stdloglvl -lt 4 ] && [ $kdump_kmsgloglvl -lt 4 ] && [ $kdump_sysloglvl -lt 4 ]; then
unset ddebug
ddebug() { :; };
fi
if [[ $kdump_stdloglvl -lt 3 ]] && [[ $kdump_kmsgloglvl -lt 3 ]] && [[ $kdump_sysloglvl -lt 3 ]]; then
if [ $kdump_stdloglvl -lt 3 ] && [ $kdump_kmsgloglvl -lt 3 ] && [ $kdump_sysloglvl -lt 3 ]; then
unset dinfo
dinfo() { :; };
fi
if [[ $kdump_stdloglvl -lt 2 ]] && [[ $kdump_kmsgloglvl -lt 2 ]] && [[ $kdump_sysloglvl -lt 2 ]]; then
if [ $kdump_stdloglvl -lt 2 ] && [ $kdump_kmsgloglvl -lt 2 ] && [ $kdump_sysloglvl -lt 2 ]; then
unset dwarn
dwarn() { :; };
unset dwarning
dwarning() { :; };
fi
if [[ $kdump_stdloglvl -lt 1 ]] && [[ $kdump_kmsgloglvl -lt 1 ]] && [[ $kdump_sysloglvl -lt 1 ]]; then
if [ $kdump_stdloglvl -lt 1 ] && [ $kdump_kmsgloglvl -lt 1 ] && [ $kdump_sysloglvl -lt 1 ]; then
unset derror
derror() { :; };
fi
@ -173,7 +172,7 @@ dlog_init() {
## @brief Converts numeric level to logger priority defined by POSIX.2.
#
# @param lvl Numeric logging level in range from 1 to 4.
# @param $1: Numeric logging level in range from 1 to 4.
# @retval 1 if @a lvl is out of range.
# @retval 0 if @a lvl is correct.
# @result Echoes logger priority.
@ -189,7 +188,7 @@ _lvl2syspri() {
## @brief Converts logger numeric level to syslog log level
#
# @param lvl Numeric logging level in range from 1 to 4.
# @param $1: Numeric logging level in range from 1 to 4.
# @retval 1 if @a lvl is out of range.
# @retval 0 if @a lvl is correct.
# @result Echoes kernel console numeric log level
@ -209,27 +208,25 @@ _lvl2syspri() {
#
# @see /usr/include/sys/syslog.h
_dlvl2syslvl() {
local lvl
case "$1" in
1) lvl=3;;
2) lvl=4;;
3) lvl=6;;
4) lvl=7;;
1) set -- 3;;
2) set -- 4;;
3) set -- 6;;
4) set -- 7;;
*) return 1;;
esac
# The number is constructed by multiplying the facility by 8 and then
# adding the level.
# About The Syslog Protocol, please refer to the RFC5424 for more details.
echo $((24+$lvl))
echo $((24 + $1))
}
## @brief Prints to stderr, to syslog and/or /dev/kmsg given message with
# given level (priority).
#
# @param lvl Numeric logging level.
# @param msg Message.
# @param $1: Numeric logging level.
# @param $2: Message.
# @retval 0 It's always returned, even if logging failed.
#
# @note This function is not supposed to be called manually. Please use
@ -251,27 +248,24 @@ _dlvl2syslvl() {
# - @c INFO to @c info
# - @c DEBUG to @c debug
_do_dlog() {
local lvl="$1"; shift
local msg="$*"
[ "$1" -le $kdump_stdloglvl ] && printf -- 'kdump: %s\n' "$2" >&2
[[ $lvl -le $kdump_stdloglvl ]] && printf -- 'kdump: %s\n' "$msg" >&2
if [[ $lvl -le $kdump_sysloglvl ]]; then
if [[ "$_dlogfd" ]]; then
printf -- "<%s>%s\n" "$(($(_dlvl2syslvl $lvl) & 7))" "$msg" >&$_dlogfd
if [ "$1" -le $kdump_sysloglvl ]; then
if [ "$_dlogfd" ]; then
printf -- "<%s>%s\n" "$(($(_dlvl2syslvl "$1") & 7))" "$2" 1>&$_dlogfd
else
logger -t "kdump[$$]" -p $(_lvl2syspri $lvl) -- "$msg"
logger -t "kdump[$$]" -p "$(_lvl2syspri "$1")" -- "$2"
fi
fi
[[ $lvl -le $kdump_kmsgloglvl ]] && \
echo "<$(_dlvl2syslvl $lvl)>kdump[$$] $msg" >/dev/kmsg
[ "$1" -le $kdump_kmsgloglvl ] && \
echo "<$(_dlvl2syslvl "$1")>kdump[$$] $2" >/dev/kmsg
}
## @brief Internal helper function for _do_dlog()
#
# @param lvl Numeric logging level.
# @param msg Message.
# @param $1: Numeric logging level.
# @param $2 [...]: Message.
# @retval 0 It's always returned, even if logging failed.
#
# @note This function is not supposed to be called manually. Please use
@ -286,12 +280,13 @@ _do_dlog() {
# echo "This is a warning" | dwarn
dlog() {
[ -z "$kdump_maxloglvl" ] && return 0
[[ $1 -le $kdump_maxloglvl ]] || return 0
[ "$1" -le "$kdump_maxloglvl" ] || return 0
if [[ $# -gt 1 ]]; then
_do_dlog "$@"
if [ $# -gt 1 ]; then
_dlog_lvl=$1; shift
_do_dlog "$_dlog_lvl" "$*"
else
while read line || [ -n "$line" ]; do
while read -r line || [ -n "$line" ]; do
_do_dlog "$1" "$line"
done
fi
@ -304,7 +299,9 @@ dlog() {
ddebug() {
set +x
dlog 4 "$@"
[ -n "$debug" ] && set -x || :
if [ -n "$debug" ]; then
set -x
fi
}
## @brief Logs message at INFO level (3)
@ -314,7 +311,9 @@ ddebug() {
dinfo() {
set +x
dlog 3 "$@"
[ -n "$debug" ] && set -x || :
if [ -n "$debug" ]; then
set -x
fi
}
## @brief Logs message at WARN level (2)
@ -324,7 +323,9 @@ dinfo() {
dwarn() {
set +x
dlog 2 "$@"
[ -n "$debug" ] && set -x || :
if [ -n "$debug" ]; then
set -x
fi
}
## @brief It's an alias to dwarn() function.
@ -334,7 +335,9 @@ dwarn() {
dwarning() {
set +x
dwarn "$@"
[ -n "$debug" ] && set -x || :
if [ -n "$debug" ]; then
set -x
fi
}
## @brief Logs message at ERROR level (1)
@ -344,5 +347,7 @@ dwarning() {
derror() {
set +x
dlog 1 "$@"
[ -n "$debug" ] && set -x || :
if [ -n "$debug" ]; then
set -x
fi
}