#! /bin/bash
# This script creates a backup of this system.  For usage instructions,
# run `backup --help'.  For a detailed description of the backup and 
# restore procedures, see /export/backup/snapshot/README.

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

# Add version-specific tar options
tar_version_options() {
  set -- $(tar --version | awk 'NR==1 {gsub(/\./, " ",$NF); print $NF}')
  if [ $# -ge 2 ]; then
    v=$((1 * 1000 + $2))
    if [ $v -gt 1025 ]; then
      taroptions="$taroptions --level=$level"
    fi
  fi
}    

load_config
taroptions="-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.
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
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;;
  -N|--no-logfile) backup_logfile=;;
  -h|--help) help;;
  -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

tar_version_options

if [ -n "$backup_logfile" ]; then
  exec >>$backup_logfile
  exec 2>&1
fi
logit "started"

$prologue_hook

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

$epilogue_hook

logit "finished"

# finis coronat opus