#! /bin/sh
# This file is part of BEAM
# Copyright (C) 2012 Sergey Poznyakoff
#
# BEAM 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 3, or (at your option)
# any later version.
#
# BEAM 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 BEAM.  If not, see <http://www.gnu.org/licenses/>.

libdir=@LIBDIR@/beam
set -e
. $libdir/common.sh
set +e
ts=`date +%Y%m%d`;
week=`date +%U`

if [ "$1" = "--wtf" ]; then
  wtf $(basename $0) create a backup
  exit 0
fi

load_config
taroptions="-c -Hpax $backup_tar_options $backup_rsh_command"

###########################################################
# Global variables
###########################################################

# Set it to "-v" to make script verbose
if [ -n "$backup_verbose" ]; then 
 verbose=-v
else
 verbose=
fi
# Set it to "echo" to initiate dry-run mode.
unset dry_run

# Number of tar errors detected during the run
tarerror=0

level=0
round=0

###########################################################
# Utility functions
###########################################################

help() {
  cat <<EOF
usage: $0 [OPTIONS]
makes incremental backup of that system

OPTIONS:

  -v, --verbose        increase verbosity
  -l, --logfile FILE   log to FILE (default $backup_logfile)
  -n, --dry-run        do nothing, print what would have been done
  -N, --no-logfile     log to stderr
  -L, --level N        create incremental dump level N
  -R, --round N        mark archives with incremental round N
  --week N             force using week number N instead of the current one
  -h, --help           produce this help list

Report bugs to <@PACKAGE_BUGREPORT@>
EOF
  exit 0
}

###########################################################
# Main
###########################################################

while [ $# -ne 0 ]
do
  case $1 in
  -v|--verbose) verbose="$verbose -v";;
  -l|--logfile) shift; backup_logfile=$1;;
  -n|--dry-run) dry_run=echo; backup_logfile=;;
  -N|--no-logfile) backup_logfile=;;
  -h|--help) help;;
  -V|--version) print_version;;
  -L|--level) shift; level=$1;;
  -R|--round) shift; round=$1;;
  --week) shift; week=$1;;
  *) echo >&2 "$0: unrecognized option $1"; exit 1;;
  esac
  shift
done

backup() {
  logit "started"

  runhook prologue_hook
  trap "runhook epilogue_hook" EXIT INT QUIT TERM

  if test -n "$backup_retain_interval" &&
     test $backup_retain_interval -gt 0; then
    @LIBEXECDIR@/beam-cleaner --retain $backup_retain_interval $verbose \
                ${dry_run+--dry-run} --suffix $backup_suffix $backup_archive_dir
    @LIBEXECDIR@/beam-cleaner --retain $backup_retain_interval $verbose \
                ${dry_run+--dry-run} --suffix .db $backup_snapshot_dir
  fi

  for item in $backup_items
  do
    eval type=\$${item}_type
    ${type}_backup $item
  done

  trap - EXIT INT QUIT TERM
  runhook epilogue_hook

  logit "finished"
}

umask ${backup_umask:-077}
prologue_hook="beam_lock $prologue_hook"

if [ -n "$backup_logfile" ]; then
  runhook openlog_hook
  exec >>$backup_logfile
  exec 2>&1
fi
if [ -z "$backup_notify_email" ]; then
  backup
else
  report=$backup_snapshot_dir/report.$$
  touch $report
  backup 2>&1 | tee $report
  mail_report $report
  rm $report
fi


# finis coronat opus