#! /bin/bash

source functions.sh

pidfile=/var/run/backup_script

mylog 0 "backup starts"

trap cleanup EXIT

function cleanup {
   echo "bye bye"
   test -f $pidfile && rm -f $pidfile
   mylog 0 "backup done"
}

if [ -f $pidfile ] ; then
   pid=$(cat $pidfile)
   if [ -d /proc/$pid ] ; then
      myerror 42 "$pid already running"
   else
      rm -f $pidfile
   fi
fi

echo $$ > $pidfile

function listBackups {
   ls -lrt $1
   exit 0
}

function usage {
   echo "$0 [-l] dir1 dir2"
   echo "make or list backups"
   exit 0
}

if [ $UID -ne 0 ] ; then
  echo "need root"
  exit 1
fi

backupdir=/var/backups/$(date -I)

while getopts hl OPTION ; do
   case $OPTION in
   (l) listBackups ${backupdir}/.. ; ;;
   (h) usage ; ;;
   (*) usage ; ;;
   esac
done

shift $(( OPTIND - 1))

mkdir -p $backupdir || myerror 2 "impossible de créer $backupdir"

for dir in "$@" ; do
  test -d $dir || { echo $dir dont exist ; mylog 2 "$dir dont exists" ; continue ; } 
  echo cp -a $dir $backupdir
  mylog $? "backup of $dir done"
done