#!/bin/sh

# Written by:  Brenda Bell
# Version:     1.04
# Date:        23 Mar 2003
# URL:         opensource.theotherbell.com

#
# This script is distributed as is without warrenty.
#
# It may be freely distributed with or without modification provided
# that:
#
# 1.  This header is included in the distribution
# 2.  The redistributor documents his modifications immediately 
#     below this header by providing his/her name and a description
#     of the modifications
#

# Change log:
#
# 23 Mar 2003: Moved some logic to backup2disk.functions for easier
#              maintenance
#
# 16 Feb 2003: Changed to use logger
#
# 15 Feb 2003: Changed error handling to guarantee that umount 
#              command gets executed; added log messages for mount
#              and umount; added tar's exit code to email notification
#
# 30 Jan 2003: Changed level0 backup to seed the level1 timestamp;
#              This allows accurate level2 backups without an
#              intervening level1; the change has no effect on
#              level1 backups
#

me=`dirname $0`/`basename $0`
if [ -z "$BACKUP2DISKHOME" ] ; then
  BACKUP2DISKHOME=`dirname $0`
fi

# include default settings and functions
. ${BACKUP2DISKHOME}/backup2disk.conf
. ${BACKUP2DISKHOME}/backup2disk.functions

# process command line arguments
for ac_option
do

  # If the previous option needs an argument, assign it.
  if test -n "$ac_prev"; then
    eval "$ac_prev=\$ac_option"
    ac_prev=
    continue
  fi

  case "$ac_option" in
  -*=*) ac_optarg=`echo "$ac_option" | sed 's/[-_a-zA-Z0-9]*=//'` ;;
  *) ac_optarg= ;;
  esac

  case "$ac_option" in

  # options with arguments
  --archivedir)
    ac_prev=archivedir;;
  --archivedir=*)
    archivedir="$ac_optarg";;
  --backupdatadir)
    ac_prev=backupdatadir;;
  --backupdatadir=*)
    backupdatadir="$ac_optarg";;
  --excludefile)
    ac_prev=excludefile;;
  --excludefile=*)
    excludefile="$ac_optarg";;
  --level)
    ac_prev=level;;
  --level=*)
    level="$ac_optarg";;
  --mount)
    ac_prev=mount;;
  --mount=*)
    mount="$ac_optarg";;
  --notification)
    ac_prev=notification;;
  --notification=*)
    notification="$ac_optarg";;
  --sendto)
    ac_prev=sendto;;
  --sendto=*)
    sendto="$ac_optarg";;
  --sourcedir)
    ac_prev=sourcedir;;
  --sourcedir=*)
    sourcedir="$ac_optarg";;
  --umount)
    ac_prev=umount;;
  --umount=*)
    umount="$ac_optarg";;

  # options which are set or unset
  --crossfilesystems)
    crossfilesystems=yes;;
  --dereferencelinks)
    dereferencelinks=yes;;
  --disablecompression)
    disablecompression=yes;;
  --disableverify)
    disableverify=yes;;

  # help
  --help)
    cat << EOF
Usage: $0.sh [options]
Options: [choices in brackets] (defaults in parenthesis)
Configuration:
  --archivedir=dir (${archivedir:-"not set"})
  --backupdatadir=dir (${backupdatadir:-"not set"})
  --crossfilesystems [yes|no] (${crossfilesystems:-"not set"})
  --dereferencelinks [yes|no] (${dereferencelinks:-"not set"})
  --disablecompression [yes|no] (${disablecompression:-"not set"})
  --disableverify [yes|no] (${disableverify:-"not set"})
  --excludefile=[none|file|default] (${excludefile:-"not set"})
  --level=[0|1|2] (${level:-"not set"})
  --mount=command (${mount:-"not set"})
  --notification=[none|summary|list|verboselist] (${notification:-"not set"})
  --sendto=email (${sendto:-"not set"})
  --sourcedir=dir (${sourcedir:-"not set"})
  --umount=command (${umount:-"not set"})
EOF
  exit 0 ;;
  esac
done

backup2disk_checkargs
if [ $? -ne 0 ] ; then
  backup2disk_notify "Error found in backup configuration; check syslog for details"
  exit 1;
fi

echo "Commencing backup at `date`..."
backup2disk_log "tar --create $label $afterdate $excludefrom $gzip $file $onefilesystem $verbose $sourcefiles"
eval tar --create $label $afterdate $excludefrom $gzip $file $onefilesystem $verbose $sourcefiles 
RC=$?
backup2disk_log "Backup exited with exit code $RC at `date`"

if [ ! -f $archivefile ] ; then
  backup2disk_log "Fatal error: $archivefile not found"
  backup2disk_notify "Fatal error: $archivefile not found; check syslog for details"
  if [ "$umount" != "" ] ; then
    $umount
  fi
  exit 1
fi

echo "Updating datestamps..."
if [ "$level" -eq 0 ] ; then
  echo $now > $datestamp0
  echo $now > $datestamp1
elif [ "$level" -eq 1 ] ; then
  echo $now > $datestamp1
fi

if [ "$disableverify" != "yes" ] ; then
  echo "Verifying backup..."
  eval tar --list $file $gzip
fi

backup2disk_notify "Host:      $HOSTNAME
Files:     $sourcedir
Archive:   $archivefile
Started:   $now
Exit code: $RC"

# unmount filesystem
if [ "$umount" != "" ] ; then
    $umount
fi