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+#!/bin/sh
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 et filetype=sh
+#
+# logging faciality module for dracut both at build- and boot-time
+#
+# Copyright 2010 Amadeusz Żołnowski <aidecoe@aidecoe.name>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+__DRACUT_LOGGER__=1
+
+
+## @brief Logging facility module for Dracut both at build- and boot-time.
+#
+# @section intro Introduction
+#
+# The logger takes a bit from Log4j philosophy. There are defined 6 logging
+# levels:
+#   - TRACE (6)
+#     The TRACE Level designates finer-grained informational events than the
+#     DEBUG.
+#   - DEBUG (5)
+#     The DEBUG Level designates fine-grained informational events that are most
+#     useful to debug an application.
+#   - INFO (4)
+#     The INFO level designates informational messages that highlight the
+#     progress of the application at coarse-grained level.
+#   - WARN (3)
+#     The WARN level designates potentially harmful situations.
+#   - ERROR (2)
+#     The ERROR level designates error events that might still allow the
+#     application to continue running.
+#   - FATAL (1)
+#     The FATAL level designates very severe error events that will presumably
+#     lead the application to abort.
+# Descriptions are borrowed from Log4j documentation:
+# http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Level.html
+#
+# @section usage Usage
+#
+# First of all you have to start with dlog_init() function which initializes
+# required variables. Don't call any other logging function before that one!
+# If you're ready with this, you can use following functions which corresponds
+# clearly to levels listed in @ref intro Introduction. Here they are:
+#   - dtrace()
+#   - ddebug()
+#   - dinfo()
+#   - dwarn()
+#   - derror()
+#   - dfatal()
+# They take all arguments given as a single message to be logged. See dlog()
+# function for details how it works. Note that you shouldn't use dlog() by
+# yourself. It's wrapped with above functions.
+#
+# @see dlog_init() dlog()
+#
+# @section conf Configuration
+#
+# Logging is controlled by following global variables:
+#   - @var stdloglvl - logging level to standard error (console output)
+#   - @var sysloglvl - logging level to syslog (by logger command)
+#   - @var fileloglvl - logging level to file
+#   - @var kmsgloglvl - logging level to /dev/kmsg (only for boot-time)
+#   - @var logfile - log file which is used when @var fileloglvl is higher
+#   than 0
+# and two global variables: @var maxloglvl and @var syslogfacility which <b>must
+# not</b> be overwritten. Both are set by dlog_init(). @var maxloglvl holds
+# maximum logging level of those three and indicates that dlog_init() was run.
+# @var syslogfacility is set either to 'user' (when building initramfs) or
+# 'daemon' (when booting).
+#
+# Logging level set by the variable means that messages from this logging level
+# and above (FATAL is the highest) will be shown. Logging levels may be set
+# independently for each destination (stderr, syslog, file, kmsg).
+#
+# @see dlog_init()
+
+
+## @brief Initializes Dracut Logger.
+#
+# @retval 1 if something has gone wrong
+# @retval 0 on success.
+#
+# @note This function need to be called before any other from this file.
+#
+# If any of the variables is not set, this function set it to default:
+#   - @var stdloglvl = 4 (info)
+#   - @var sysloglvl = 0 (no logging)
+#   - @var fileloglvl is set to 4 when @var logfile is set too, otherwise it's
+#   - @var kmsgloglvl = 0 (no logging)
+#   set to 0
+#
+# @warning Function sets global variables @var maxloglvl and @syslogfacility.
+# See file doc comment for details.
+dlog_init() {
+    local __oldumask
+    local ret=0; local errmsg
+    [ -z "$stdloglvl" ] && stdloglvl=4
+    [ -z "$sysloglvl" ] && sysloglvl=0
+    [ -z "$kmsgloglvl" ] && kmsgloglvl=0
+    # Skip initialization if it's already done.
+    [ -n "$maxloglvl" ] && return 0
+
+    if [ -z "$fileloglvl" ]; then
+        [ -w "$logfile" ] && fileloglvl=4 || fileloglvl=0
+    elif [ $fileloglvl -gt 0 ]; then
+        __oldumask=$(umask)
+        umask 0377
+        ! [ -e "$logfile" ] && >"$logfile"
+        umask $__oldumask
+        if [ -w "$logfile" -a -f "$logfile" ]; then
+            # Mark new run in the log file
+            echo >>"$logfile"
+            if command -v date >/dev/null; then
+                echo "=== $(date) ===" >>"$logfile"
+            else
+                echo "===============================================" >>"$logfile"
+            fi
+            echo >>"$logfile"
+        else
+            # We cannot log to file, so turn this facility off.
+            fileloglvl=0
+            ret=1
+            errmsg="'$logfile' is not a writable file"
+        fi
+    fi
+
+    if [ $sysloglvl -gt 0 ]; then
+        if ! [ -S /dev/log -a -w /dev/log ] || ! command -v logger >/dev/null
+        then
+            # We cannot log to syslog, so turn this facility off.
+            sysloglvl=0
+            ret=1
+            errmsg="No '/dev/log' or 'logger' included for syslog logging"
+        fi
+    fi
+
+    if [ $sysloglvl -gt 0 -o $kmsgloglvl -gt 0 ]; then
+        if [ -n "$dracutbasedir" ]; then
+            readonly syslogfacility=user
+        else
+            readonly syslogfacility=daemon
+        fi
+        export syslogfacility
+    fi
+
+    local lvl; local maxloglvl_l=0
+    for lvl in $stdloglvl $sysloglvl $fileloglvl $kmsgloglvl; do
+        [ $lvl -gt $maxloglvl_l ] && maxloglvl_l=$lvl
+    done
+    readonly maxloglvl=$maxloglvl_l
+    export maxloglvl
+
+    [ -n "$errmsg" ] && derror "$errmsg"
+
+    return $ret
+}
+
+## @brief Converts numeric logging level to the first letter of level name.
+#
+# @param lvl Numeric logging level in range from 1 to 6.
+# @retval 1 if @a lvl is out of range.
+# @retval 0 if @a lvl is correct.
+# @result Echoes first letter of level name.
+_lvl2char() {
+    case "$1" in
+        1) echo F;;
+        2) echo E;;
+        3) echo W;;
+        4) echo I;;
+        5) echo D;;
+        6) echo T;;
+        *) return 1;;
+    esac
+}
+
+## @brief Converts numeric level to logger priority defined by POSIX.2.
+#
+# @param lvl Numeric logging level in range from 1 to 6.
+# @retval 1 if @a lvl is out of range.
+# @retval 0 if @a lvl is correct.
+# @result Echoes logger priority.
+_lvl2syspri() {
+    printf $syslogfacility.
+    case "$1" in
+        1) echo crit;;
+        2) echo error;;
+        3) echo warning;;
+        4) echo info;;
+        5) echo debug;;
+        6) echo debug;;
+        *) return 1;;
+    esac
+}
+
+## @brief Converts dracut-logger numeric level to syslog log level
+#
+# @param lvl Numeric logging level in range from 1 to 6.
+# @retval 1 if @a lvl is out of range.
+# @retval 0 if @a lvl is correct.
+# @result Echoes kernel console numeric log level
+#
+# Conversion is done as follows:
+#
+# <tt>
+#   FATAL(1) -> LOG_EMERG (0)
+#   none     -> LOG_ALERT (1)
+#   none     -> LOG_CRIT (2)
+#   ERROR(2) -> LOG_ERR (3)
+#   WARN(3)  -> LOG_WARNING (4)
+#   none     -> LOG_NOTICE (5)
+#   INFO(4)  -> LOG_INFO (6)
+#   DEBUG(5) -> LOG_DEBUG (7)
+#   TRACE(6) /
+# </tt>
+#
+# @see /usr/include/sys/syslog.h
+_dlvl2syslvl() {
+    local lvl
+
+    case "$1" in
+        1) lvl=0;;
+        2) lvl=3;;
+        3) lvl=4;;
+        4) lvl=6;;
+        5) lvl=7;;
+        6) lvl=7;;
+        *) return 1;;
+    esac
+
+    [ "$syslogfacility" = user ] && echo $((8+$lvl)) || echo $((24+$lvl))
+}
+
+## @brief Prints to stderr and/or writes to file, to syslog and/or /dev/kmsg
+# given message with given level (priority).
+#
+# @param lvl Numeric logging level.
+# @param msg Message.
+# @retval 0 It's always returned, even if logging failed.
+#
+# @note This function is not supposed to be called manually. Please use
+# dtrace(), ddebug(), or others instead which wrap this one.
+#
+# This is core logging function which logs given message to standard error, file
+# and/or syslog (with POSIX shell command <tt>logger</tt>) and/or to /dev/kmsg.
+# The format is following:
+#
+# <tt>X: some message</tt>
+#
+# where @c X is the first letter of logging level. See module description for
+# details on that.
+#
+# Message to syslog is sent with tag @c dracut. Priorities are mapped as
+# following:
+#   - @c FATAL to @c crit
+#   - @c ERROR to @c error
+#   - @c WARN to @c warning
+#   - @c INFO to @c info
+#   - @c DEBUG and @c TRACE both to @c debug
+_do_dlog() {
+    local lvl="$1"; shift
+    local lvlc=$(_lvl2char "$lvl") || return 0
+    local msg="$lvlc: $*"
+
+    [ $lvl -le $stdloglvl ] && echo "$msg" >&2
+    if [ $lvl -le $sysloglvl ]; then
+        logger -t "dracut[$$]" -p $(_lvl2syspri $lvl) "$msg"
+    fi
+    if [ $lvl -le $fileloglvl -a -w "$logfile" -a -f "$logfile" ]; then
+        echo "$msg" >>"$logfile"
+    fi
+    [ $lvl -le $kmsgloglvl ] && \
+        echo "<$(_dlvl2syslvl $lvl)>dracut[$$] $msg" >/dev/kmsg
+}
+
+## @brief Internal helper function for _do_dlog()
+#
+# @param lvl Numeric logging level.
+# @param msg Message.
+# @retval 0 It's always returned, even if logging failed.
+#
+# @note This function is not supposed to be called manually. Please use
+# dtrace(), ddebug(), or others instead which wrap this one.
+#
+# This function calls _do_dlog() either with parameter msg, or if
+# none is given, it will read standard input and will use every line as
+# a message.
+#
+# This enables:
+# dwarn "This is a warning"
+# echo "This is a warning" | dwarn
+dlog() {
+    [ -z "$maxloglvl" ] && return 0
+    [ $1 -le $maxloglvl ] || return 0
+
+    if [ $# -gt 1 ]; then
+        _do_dlog "$@"
+    else
+        while read line; do
+            _do_dlog "$1" "$line"
+        done
+    fi
+}
+
+## @brief Logs message at TRACE level (6)
+#
+# @param msg Message.
+# @retval 0 It's always returned, even if logging failed.
+dtrace() {
+    set +x
+    dlog 6 "$@"
+    [ -n "$debug" ] && set -x || :
+}
+
+## @brief Logs message at DEBUG level (5)
+#
+# @param msg Message.
+# @retval 0 It's always returned, even if logging failed.
+ddebug() {
+    set +x
+    dlog 5 "$@"
+    [ -n "$debug" ] && set -x || :
+}
+
+## @brief Logs message at INFO level (4)
+#
+# @param msg Message.
+# @retval 0 It's always returned, even if logging failed.
+dinfo() {
+    set +x
+    dlog 4 "$@"
+    [ -n "$debug" ] && set -x || :
+}
+
+## @brief Logs message at WARN level (3)
+#
+# @param msg Message.
+# @retval 0 It's always returned, even if logging failed.
+dwarn() {
+    set +x
+    dlog 3 "$@"
+    [ -n "$debug" ] && set -x || :
+}
+
+## @brief It's an alias to dwarn() function.
+#
+# @param msg Message.
+# @retval 0 It's always returned, even if logging failed.
+dwarning() {
+    set +x
+    dwarn "$@"
+    [ -n "$debug" ] && set -x || :
+}
+
+## @brief Logs message at ERROR level (2)
+#
+# @param msg Message.
+# @retval 0 It's always returned, even if logging failed.
+derror() {
+    set +x
+    dlog 2 "$@"
+    [ -n "$debug" ] && set -x || :
+}
+
+## @brief Logs message at FATAL level (1)
+#
+# @param msg Message.
+# @retval 0 It's always returned, even if logging failed.
+dfatal() {
+    set +x
+    dlog 1 "$@"
+    [ -n "$debug" ] && set -x || :
+}