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#! /bin/bash
# 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/>.

# Force C locale
LC_ALL=C
export LC_ALL

prologue_hook=
epilogue_hook=

# User configuration variables
backup_tar_options=
backup_suffix=
backup_archive_dir=
backup_snapshot_dir=
backup_verbose=
backup_logfile="/var/log/backup"

error() {
  echo >&2 $0: $*
}

logit() {
  echo `date`: $*
}

abend() {
  ec=$1
  shift
  error $@
  exit $ec
}

tarcode() {
  case $1 in
  0) echo "`date`: success";;
  1) echo "`date`: some files changed while being archived";;
  2) echo "`date`: fatal error occurred, but trying to continue anyway"
     tarerror=$((tarerror + 1));;
  *) echo "`date`: unexpected error code $1"
     tarerror=$((tarerror + 1));
  esac
}

load_config() {
  local delayed_exit  
  
  test -z "$BEAM_CONFIG" && BEAM_CONFIG=@SYSCONFDIR@/beam.conf
  if [ -r $BEAM_CONFIG ]; then
    . $BEAM_CONFIG
  else
    abend 1 "configuration file $BEAM_CONFIG does not exist or is unreadable"
  fi
  
  if [ -z "$backup_items" ]; then
    abend 1 "backup_items not specified"
  fi

  delayed_exit=
  loaded_types=
  for item in $backup_items
  do
    eval type=\$${item}_type
    if [ -z "$type" ]; then
      error "${item}_type not set"
      delayed_exit=1
      continue
    fi
  
    if echo "$loaded_types" | grep -wq $type; then
      :
    elif [ -x $libdir/${type}.sh ]; then
      . $libdir/${type}.sh || delayed_exit=1
      loaded_types="$loaded_files
$type"
    else
      error "$libdir/${type}.sh not found"
      delayed_exit=1 
    fi

    ${type}_check $item || delayed_exit=1
  done

  test -n "$delayed_exit" && abend 1 "aborting"

  tar_suffix=${backup_suffix:-.tar}

  if [ -n "$backup_bucket_name" ]; then
    . @LIBDIR@/beam/s3.sh
    prologue_hook="$prologue_hook s3_mount"
  fi
}

runhook() {
  local hook_list
  
  eval hook_list=\$$1
  for hook in $hook_list
  do
    $hook
  done
}
 
print_version() {
  name=$(basename $0)
  cat <<EOF
$name (@PACKAGE_NAME@) @PACKAGE_VERSION@
Copyright (C) 2012 Sergey Poznyakoff
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
EOF
  exit 0
}

wtf() {
  l=`echo "${1#beam-}"|sed "s|.|.|g"`
  s=$(echo "                " | sed "s|$l|${1#beam-}|")
  shift
  echo "    $s $@"
}

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