#!/bin/bash

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#

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# logging faciality module for dracut both at build- and boot-time

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#

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# Copyright 2010 Amadeusz Żołnowski <aidecoe@aidecoe.name>

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#

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# This program is free software; you can redistribute it and/or modify

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# it under the terms of the GNU General Public License as published by

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# the Free Software Foundation; either version 2 of the License, or

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# (at your option) any later version.

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#

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# This program is distributed in the hope that it will be useful,

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# but WITHOUT ANY WARRANTY; without even the implied warranty of

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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

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# GNU General Public License for more details.

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#

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# You should have received a copy of the GNU General Public License

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# along with this program. If not, see <http://www.gnu.org/licenses/>.

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__DRACUT_LOGGER__=1

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## @brief Logging facility module for dracut both at build- and boot-time.

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#

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# @section intro Introduction

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#

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# The logger takes a bit from Log4j philosophy. There are defined 6 logging

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# levels:

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# - TRACE (6)

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# The TRACE Level designates finer-grained informational events than the

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# DEBUG.

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# - DEBUG (5)

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# The DEBUG Level designates fine-grained informational events that are most

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# useful to debug an application.

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# - INFO (4)

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# The INFO level designates informational messages that highlight the

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# progress of the application at coarse-grained level.

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# - WARN (3)

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# The WARN level designates potentially harmful situations.

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# - ERROR (2)

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# The ERROR level designates error events that might still allow the

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# application to continue running.

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# - FATAL (1)

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# The FATAL level designates very severe error events that will presumably

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# lead the application to abort.

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# Descriptions are borrowed from Log4j documentation:

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# http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Level.html

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#

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# @section usage Usage

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#

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# First of all you have to start with dlog_init() function which initializes

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# required variables. Don't call any other logging function before that one!

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# If you're ready with this, you can use following functions which corresponds

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# clearly to levels listed in @ref intro Introduction. Here they are:

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# - dtrace()

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# - ddebug()

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# - dinfo()

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# - dwarn()

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# - derror()

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# - dfatal()

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# They take all arguments given as a single message to be logged. See dlog()

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# function for details how it works. Note that you shouldn't use dlog() by

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# yourself. It's wrapped with above functions.

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#

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# @see dlog_init() dlog()

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#

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# @section conf Configuration

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#

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# Logging is controlled by following global variables:

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# - @var stdloglvl - logging level to standard error (console output)

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# - @var sysloglvl - logging level to syslog (by logger command)

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# - @var fileloglvl - logging level to file

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# - @var kmsgloglvl - logging level to /dev/kmsg (only for boot-time)

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# - @var logfile - log file which is used when @var fileloglvl is higher

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# than 0

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# and two global variables: @var maxloglvl and @var syslogfacility which <b>must

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# not</b> be overwritten. Both are set by dlog_init(). @var maxloglvl holds

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# maximum logging level of those three and indicates that dlog_init() was run.

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# @var syslogfacility is set either to 'user' (when building initramfs) or

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# 'daemon' (when booting).

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#

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# Logging level set by the variable means that messages from this logging level

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# and above (FATAL is the highest) will be shown. Logging levels may be set

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# independently for each destination (stderr, syslog, file, kmsg).

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#

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# @see dlog_init()

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## @brief Initializes dracut Logger.

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#

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# @retval 1 if something has gone wrong

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# @retval 0 on success.

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#

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# @note This function need to be called before any other from this file.

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#

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# If any of the variables is not set, this function set it to default:

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# - @var stdloglvl = 4 (info)

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# - @var sysloglvl = 0 (no logging)

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# - @var fileloglvl is set to 4 when @var logfile is set too, otherwise it's

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# - @var kmsgloglvl = 0 (no logging)

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# set to 0

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#

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# @warning Function sets global variables @var maxloglvl and @syslogfacility.

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# See file doc comment for details.

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dlog_init() {

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local __oldumask

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local ret=0; local errmsg

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[ -z "$stdloglvl" ] && stdloglvl=4

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[ -z "$sysloglvl" ] && sysloglvl=0

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[ -z "$kmsgloglvl" ] && kmsgloglvl=0

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# Skip initialization if it's already done.

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[ -n "$maxloglvl" ] && return 0

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if [ -z "$fileloglvl" ]; then

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[ -w "$logfile" ] && fileloglvl=4 || fileloglvl=0

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elif (( $fileloglvl > 0 )); then

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if [[ $logfile ]]; then

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__oldumask=$(umask)

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umask 0377

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! [ -e "$logfile" ] && >"$logfile"

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umask $__oldumask

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if [ -w "$logfile" -a -f "$logfile" ]; then

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# Mark new run in the log file

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echo >>"$logfile"

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if command -v date >/dev/null; then

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echo "=== $(date) ===" >>"$logfile"

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else

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echo "===============================================" >>"$logfile"

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fi

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echo >>"$logfile"

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else

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# We cannot log to file, so turn this facility off.

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fileloglvl=0

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ret=1

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errmsg="'$logfile' is not a writable file"

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fi

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fi

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fi

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if (( $UID != 0 )); then

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kmsgloglvl=0

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sysloglvl=0

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fi

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if (( $sysloglvl > 0 )); then

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if [[ -d /run/systemd/journal ]] \

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&& type -P systemd-cat &>/dev/null \

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&& systemctl --quiet is-active systemd-journald.socket &>/dev/null \

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&& { echo "dracut-$DRACUT_VERSION" | systemd-cat -t 'dracut' &>/dev/null; } ; then

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readonly _systemdcatfile="$DRACUT_TMPDIR/systemd-cat"

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mkfifo "$_systemdcatfile"

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readonly _dlogfd=15

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systemd-cat -t 'dracut' --level-prefix=true <"$_systemdcatfile" &

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exec 15>"$_systemdcatfile"

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elif ! [ -S /dev/log -a -w /dev/log ] || ! command -v logger >/dev/null; then

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# We cannot log to syslog, so turn this facility off.

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kmsgloglvl=$sysloglvl

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sysloglvl=0

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ret=1

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errmsg="No '/dev/log' or 'logger' included for syslog logging"

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fi

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fi

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if (($sysloglvl > 0)) || (($kmsgloglvl > 0 )); then

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if [ -n "$dracutbasedir" ]; then

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readonly syslogfacility=user

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else

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readonly syslogfacility=daemon

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fi

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export syslogfacility

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fi

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local lvl; local maxloglvl_l=0

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for lvl in $stdloglvl $sysloglvl $fileloglvl $kmsgloglvl; do

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(( $lvl > $maxloglvl_l )) && maxloglvl_l=$lvl

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done

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readonly maxloglvl=$maxloglvl_l

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export maxloglvl

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if (($stdloglvl < 6)) && (($kmsgloglvl < 6)) && (($fileloglvl < 6)) && (($sysloglvl < 6)); then

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unset dtrace

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dtrace() { :; };

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fi

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if (($stdloglvl < 5)) && (($kmsgloglvl < 5)) && (($fileloglvl < 5)) && (($sysloglvl < 5)); then

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unset ddebug

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ddebug() { :; };

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fi

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if (($stdloglvl < 4)) && (($kmsgloglvl < 4)) && (($fileloglvl < 4)) && (($sysloglvl < 4)); then

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unset dinfo

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dinfo() { :; };

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fi

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if (($stdloglvl < 3)) && (($kmsgloglvl < 3)) && (($fileloglvl < 3)) && (($sysloglvl < 3)); then

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unset dwarn

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dwarn() { :; };

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unset dwarning

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dwarning() { :; };

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fi

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if (($stdloglvl < 2)) && (($kmsgloglvl < 2)) && (($fileloglvl < 2)) && (($sysloglvl < 2)); then

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unset derror

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derror() { :; };

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fi

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if (($stdloglvl < 1)) && (($kmsgloglvl < 1)) && (($fileloglvl < 1)) && (($sysloglvl < 1)); then

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unset dfatal

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dfatal() { :; };

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fi

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[ -n "$errmsg" ] && derror "$errmsg"

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return $ret

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}

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## @brief Converts numeric logging level to the first letter of level name.

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#

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# @param lvl Numeric logging level in range from 1 to 6.

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# @retval 1 if @a lvl is out of range.

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# @retval 0 if @a lvl is correct.

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# @result Echoes first letter of level name.

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_lvl2char() {

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case "$1" in

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1) echo F;;

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2) echo E;;

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3) echo W;;

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4) echo I;;

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5) echo D;;

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6) echo T;;

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*) return 1;;

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esac

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}

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## @brief Converts numeric level to logger priority defined by POSIX.2.

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#

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# @param lvl Numeric logging level in range from 1 to 6.

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# @retval 1 if @a lvl is out of range.

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# @retval 0 if @a lvl is correct.

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# @result Echoes logger priority.

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_lvl2syspri() {

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printf $syslogfacility.

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case "$1" in

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1) echo crit;;

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2) echo error;;

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3) echo warning;;

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4) echo info;;

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5) echo debug;;

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6) echo debug;;

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*) return 1;;

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esac

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}

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## @brief Converts dracut-logger numeric level to syslog log level

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#

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# @param lvl Numeric logging level in range from 1 to 6.

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# @retval 1 if @a lvl is out of range.

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# @retval 0 if @a lvl is correct.

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# @result Echoes kernel console numeric log level

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#

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# Conversion is done as follows:

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#

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# <tt>

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# none -> LOG_EMERG (0)

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# none -> LOG_ALERT (1)

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# FATAL(1) -> LOG_CRIT (2)

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# ERROR(2) -> LOG_ERR (3)

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# WARN(3) -> LOG_WARNING (4)

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# none -> LOG_NOTICE (5)

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# INFO(4) -> LOG_INFO (6)

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# DEBUG(5) -> LOG_DEBUG (7)

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# TRACE(6) /

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# </tt>

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#

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# @see /usr/include/sys/syslog.h

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_dlvl2syslvl() {

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local lvl

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case "$1" in

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1) lvl=2;;

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2) lvl=3;;

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3) lvl=4;;

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4) lvl=6;;

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5) lvl=7;;

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6) lvl=7;;

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*) return 1;;

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esac

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[ "$syslogfacility" = user ] && echo $((8+$lvl)) || echo $((24+$lvl))

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}

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## @brief Prints to stderr and/or writes to file, to syslog and/or /dev/kmsg

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# given message with given level (priority).

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#

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# @param lvl Numeric logging level.

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# @param msg Message.

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# @retval 0 It's always returned, even if logging failed.

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#

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# @note This function is not supposed to be called manually. Please use

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# dtrace(), ddebug(), or others instead which wrap this one.

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#

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# This is core logging function which logs given message to standard error, file

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# and/or syslog (with POSIX shell command <tt>logger</tt>) and/or to /dev/kmsg.

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# The format is following:

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#

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# <tt>X: some message</tt>

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#

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# where @c X is the first letter of logging level. See module description for

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# details on that.

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#

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# Message to syslog is sent with tag @c dracut. Priorities are mapped as

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# following:

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# - @c FATAL to @c crit

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# - @c ERROR to @c error

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# - @c WARN to @c warning

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# - @c INFO to @c info

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# - @c DEBUG and @c TRACE both to @c debug

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_do_dlog() {

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local lvl="$1"; shift

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local lvlc=$(_lvl2char "$lvl") || return 0

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local msg="$*"

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local lmsg="$lvlc: $*"

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(( $lvl <= $stdloglvl )) && printf -- 'dracut: %s\n' "$msg" >&2

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if (( $lvl <= $sysloglvl )); then

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if [[ "$_dlogfd" ]]; then

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printf -- "<%s>%s\n" "$(($(_dlvl2syslvl $lvl) & 7))" "$msg" >&$_dlogfd

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else

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logger -t "dracut[$$]" -p $(_lvl2syspri $lvl) -- "$msg"

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fi

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fi

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if (( $lvl <= $fileloglvl )) && [[ -w "$logfile" ]] && [[ -f "$logfile" ]]; then

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echo "$lmsg" >>"$logfile"

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fi

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(( $lvl <= $kmsgloglvl )) && \

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echo "<$(_dlvl2syslvl $lvl)>dracut[$$] $msg" >/dev/kmsg

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}

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## @brief Internal helper function for _do_dlog()

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#

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# @param lvl Numeric logging level.

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# @param msg Message.

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# @retval 0 It's always returned, even if logging failed.

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#

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# @note This function is not supposed to be called manually. Please use

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# dtrace(), ddebug(), or others instead which wrap this one.

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#

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# This function calls _do_dlog() either with parameter msg, or if

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# none is given, it will read standard input and will use every line as

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# a message.

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#

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# This enables:

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# dwarn "This is a warning"

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# echo "This is a warning" | dwarn

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dlog() {

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[ -z "$maxloglvl" ] && return 0

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(( $1 <= $maxloglvl )) || return 0

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if (( $# > 1 )); then

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_do_dlog "$@"

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else

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while read line || [ -n "$line" ]; do

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_do_dlog "$1" "$line"

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done

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fi

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}

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## @brief Logs message at TRACE level (6)

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#

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# @param msg Message.

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# @retval 0 It's always returned, even if logging failed.

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dtrace() {

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set +x

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dlog 6 "$@"

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[ -n "$debug" ] && set -x || :

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}

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## @brief Logs message at DEBUG level (5)

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#

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# @param msg Message.

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# @retval 0 It's always returned, even if logging failed.

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ddebug() {

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set +x

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dlog 5 "$@"

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[ -n "$debug" ] && set -x || :

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}

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## @brief Logs message at INFO level (4)

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#

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# @param msg Message.

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# @retval 0 It's always returned, even if logging failed.

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dinfo() {

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set +x

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dlog 4 "$@"

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[ -n "$debug" ] && set -x || :

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}

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## @brief Logs message at WARN level (3)

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#

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# @param msg Message.

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# @retval 0 It's always returned, even if logging failed.

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dwarn() {

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set +x

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dlog 3 "$@"

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[ -n "$debug" ] && set -x || :

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}

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## @brief It's an alias to dwarn() function.

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#

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# @param msg Message.

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# @retval 0 It's always returned, even if logging failed.

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dwarning() {

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set +x

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dwarn "$@"

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[ -n "$debug" ] && set -x || :

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}

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## @brief Logs message at ERROR level (2)

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#

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# @param msg Message.

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# @retval 0 It's always returned, even if logging failed.

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derror() {

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set +x

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dlog 2 "$@"

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[ -n "$debug" ] && set -x || :

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}

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## @brief Logs message at FATAL level (1)

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#

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# @param msg Message.

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# @retval 0 It's always returned, even if logging failed.

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dfatal() {

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set +x

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dlog 1 "$@"

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[ -n "$debug" ] && set -x || :

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}

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