#!/bin/sh

#
# /usr/local/dsm/sbin/dsmbackup
#
# incremental DSM backup
#
# 2013-10-24 RS@MPDL
#



## pre

# id
progname=`basename $0`
dirname=`dirname $0`


# pre-sets
rc=0

opt_n=0
opt_v=0
opt_q=0
opt_l=0
opt_o=0

opt_fi=
opt_dsmci=


# functions
usage () {
  echo "error: $@
usage: $progname ..." >&2
  exit 254
}


## main

# parse command line options
while [ ! -z "$1" ]
do
  case "$1" in
    -h | -help )
      usage "help wanted"
      ;;

    -v | -n | -l | -o )
      id=opt_`echo X$1 | sed 's/^X-//'`
      eval val=\$$id
      val=`expr $val + 1`
      eval $id=$val
      ;;

    +v )
      id=opt_`echo X$1 | sed 's/^X+//'`
      eval val=\$$id
      [ $val -gt 0 ] && val=`expr $val - 1`
      eval $id=$val
      ;;

    -fi )
      [ -z "$2" ] && usage "missing argument for option $1"
      id=opt_`echo X$1 | sed 's/^X\-//'`
      val="$2"
      eval $id=$val
      shift
      ;;

    -- )
      shift
      opt_dsmci="$@"
      break
      ;;

    -* | +* )
      usage "unexpected option: $1"
      ;;

    * )
      for var in opt_fi
      do
        eval val=\$$var
        if [ -z "$val" ]
        then
          eval $var="$1"
          break
        fi
      done
  esac

  shift
done


# pid file
pidfile=/var/run/$progname.pid

if [ -f $pidfile ]
then
   pid=`cat $pidfile`
   if [ ! -z "$pid" -a -d /proc/$pid ]
   then
     echo "$progname: found $progname (pid: $pid) already running - aborted" >&2
     exit 249
   fi
fi
echo $$ > $pidfile


# trap to remove pid file
trap "rm -f $pidfile" QUIT TERM EXIT



# dsm settings
DSM_LOG=/var/log
export DSM_LOG


# servername handling:
# to easily address any non-default TSM server stanza name,
# please, read "dsm-servername.incl"

dsm_incl=dsm-servername.incl
[ -f $dsm_incl ] && . $dsm_incl


# short cuts
dsmbackup_se=${servername:+"-server=$servername"}
dsmbackup_cmd="dsmc i $opt_fi $opt_dsmci $dsmbackup_se"
dsmbackup_log=$DSM_LOG/${progname}.log
dsmbackup_pru=$DSM_LOG/${progname}.pru


# prune log
if [ -f $dsmbackup_log ]
then
  date_fmt='+%Y-%m-%d %H:%M:%S'
  mod_date=`stat -c %y $dsmbackup_log`
  mod_date=`date -d "$mod_date" "$date_fmt"`
  run_date=`date "$date_fmt"`

  echo "# $run_date `uname -n` $progname[$$]: added $dsmbackup_log (from $mod_date)" >> $dsmbackup_pru
  cat $dsmbackup_log  >> $dsmbackup_pru
  cp /dev/null $dsmbackup_log
fi

log () {
  if [ $opt_l -eq 0 ]
  then
    cat - >> $dsmbackup_log
  else
    tee -a $dsmbackup_log
  fi
}


# get options
(
if [ $opt_o -gt 0 ]
then
  _filter="grep DSM"
  [ $opt_v -gt 1 ] && _filter=cat
  set | $_filter

  dsmqopt_cmd="dsmc q opt $dsmbackup_se"
  $dsmqopt_cmd 2>&1
fi


# action 
if [ $opt_n -eq 0 ] 
then
  $dsmbackup_cmd 2>&1
  rc=$?

  # add rc
  [ $opt_q -ne 0 ] && echo "(rc=$rc)"
fi
) | log


## end
exit $rc