#! /bin/sh
### BEGIN INIT INFO
# Provides:          logbackup
# Required-Start:    $local_fs $remote_fs
# Required-Stop:     $local_fs $remote_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 6
# Short-Description: Back-up and rotation of log files
# Description:       This script runs a last backup & rotation of the log files
#                    before halting the system. The system logs would otherwise
#                    be lost since they reside in a tmpfs partition.
### END INIT INFO

# Author: François Févotte

DESC="logbackup"
FRAGDIR="/etc/logbackup.d"

# Load the VERBOSE setting and other rcS variables
. /lib/init/vars.sh

# Define LSB log_* functions.
# Depend on lsb-base (>= 3.0-6) to ensure that this file is present.
. /lib/lsb/init-functions


[ -r /etc/logbackup.conf ] && . /etc/logbackup.conf

# Retrieve backed-up logs
do_retrieve()
{
    for FRAGMENT in $FRAGDIR/*; do
        [ -x $FRAGMENT ] && $FRAGMENT retrieve
    done
    return 0
}

# Rotation and backup of the logs
do_backup()
{
    if [ "$LOGBACKUP_INCLUDED" != "" ]; then
        echo $LOGBACKUP_INCLUDED > $LOGBACKUP_INCLUDED
        if [ "$LOGBACKUP_OMITTED" != "" ]; then
            echo $LOGBACKUP_OMITTED >> $LOGBACKUP_INCLUDED
            rm -f $LOGBACKUP_OMITTED
        fi
    fi

    for FRAGMENT in $FRAGDIR/*; do
        [ -x $FRAGMENT ] && $FRAGMENT backup
    done

    if [ "$LOGBACKUP_INCLUDED" != "" -a "$LOGBACKUP_OMITTED" != "" ]; then
        echo "# This is the list of all files in /var/log that were not" >> $LOGBACKUP_OMITTED
        echo "# handled by logbackup.                                  " >> $LOGBACKUP_OMITTED
        echo "# You shoud pay attention to these files, as they may    " >> $LOGBACKUP_OMITTED
        echo "# grow to very large sizes and fill your entire /var/log " >> $LOGBACKUP_OMITTED
        echo "# partition. If you do not want to keep these log files, " >> $LOGBACKUP_OMITTED
        echo "# you can add them to the list of files cleaned by       " >> $LOGBACKUP_OMITTED
        echo "# logbackup in /etc/logbackup.d/clean, so that they will " >> $LOGBACKUP_OMITTED
        echo "# be removed once a day.                                 " >> $LOGBACKUP_OMITTED
        echo "                                                         " >> $LOGBACKUP_OMITTED

        find /var/log -not -type d         \
          | grep -v -f $LOGBACKUP_INCLUDED \
          >> $LOGBACKUP_OMITTED
    fi

    return 0
}


case "$1" in
  start)
    [ "$VERBOSE" != no ] && log_daemon_msg "Starting $DESC" "$NAME"
    logger -i -t "logbackup" "Retrieve backed-up logs at system startup"
    do_retrieve
    [ "$VERBOSE" != no ] && log_end_msg 0
    ;;
  stop)
    [ "$VERBOSE" != no ] && log_daemon_msg "Stopping $DESC" "$NAME"
    logger -i -t "logbackup" "Back-up the logs before halting"
    do_backup
    [ "$VERBOSE" != no ] && log_end_msg 0
    ;;
  restart|reload|force-reload)
    log_daemon_msg "Restarting $DESC" "$NAME"
    logger -i -t "logbackup" "Back-up the logs at the user's request"
    do_backup
    log_end_msg 0
    ;;
  *)
    echo "Usage: $SCRIPTNAME {start|stop|restart|reload|force-reload}" >&2
    exit 3
    ;;
esac

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