customize_syslog_config

#!/bin/sh
#
#   customize_syslog_config
#
#   Patch syslog server config
#   ref: to http://forum.synology.com/enu/viewtopic.php?f=182&t=64558#p257406
#
PATH=/bin:/usr/bin:/usr/syno/bin

TMPLDIR=/volume1/@appstore/SyslogServer/etc/template

workfile=/tmp/work-$$
trap "/bin/rm -f $workfile" EXIT

LOGDIR=/volume2/var/log         # edit according to your preferences

must_restart=""
mode="apply"

while getopts :u OPT; do
    case $OPT in
        u|+u)
            mode="undo"
            ;;
        *)
            echo "usage: `basename $0` [+-u} [--] ARGS..."
            exit 2
    esac
done
shift `expr $OPTIND - 1`
OPTIND=1
#+
#   usage:
#       _patch <file2patch> <regexp matching only added lines> <extra conf line> [<extra conf line>...]
#-
_patch () {
    local source="$1" ; shift
    local regexp="$1" ; shift
    local line

    (
        grep -v "$regexp" $source
        for line in "$@" ; do
            echo "$line"
        done
    ) > $workfile

    if  cmp -s $source $workfile ; then
        echo >&2 "NOCHANGES: $source"
    else
        [ -f $source.ori ] || cp -p $source $source.ori
        cp $workfile $source
        echo >&2 "PATCHED: $source"
        must_restart="YES"

    fi
}

_apply () {
    _patch $TMPLDIR/dest_db.template  \
        "$LOGDIR" \
        'destination messages { file("'$LOGDIR'/messages-$YEAR" template("$ISODATE $HOST $MSGHDR$MSG\n") ); };'

    _patch $TMPLDIR/log_net_to_db.template \
        "log.*source.*s_syno_net.*s_syno_ietf.*destination.*messages"  \
        'log { source(s_syno_net); source(s_syno_ietf); destination(messages); };'

    _patch $TMPLDIR/system.conf \
        'other_' \
        'source other_local { file("/proc/kmsg");unix-stream("/dev/log");unix-stream("/var/run/syslog");unix-stream("/var/run/log");internal(); };' \
        'destination other_file { file("'$LOGDIR'/messages-$YEAR" template("$ISODATE $HOST $MSGHDR$MSG\n") ); };' \
        'log { source(other_local);  destination(other_file); };'
}

_undo () {
    for file in \
        $TMPLDIR/dest_db.template  \
        $TMPLDIR/log_net_to_db.template \
        $TMPLDIR/system.conf
    do
        if [ -f $file.ori ] && ! cmp -s $file $file.ori ; then
            cp $file.ori $file
            echo >&2 "RESTORED: $file"
            must_restart="YES"
        fi
    done
}

case $mode in
    undo)
        _undo
        ;;
    apply)
        _apply
        ;;
esac

if [  "$must_restart" != "" ] ;  then
    echo >&2 "please stop then start syslog server"

    # echo >&2 "restarting server"
    # for action in stop start
    # do
    #     # only keep path in env
    #     env - PATH=$PATH synopkg $action syslogserver
    # done
fi