#!/bin/sh

###
#
# this script is to be launched on dar command line when testing an archive with -s option (slicing)
# you need to run this script from dar, adding the following argument on command-line
#
#     -E "dar_par_test.duc %p %b %n %e %c"
#
###
#
# if you prefer you can also add the line above in your the $HOME/.darrc file
# under the test: conditional statement (see dar man page)
#
###
#
# usage par_script slice.basename slice.number extension
# generates a Parchive redundancy file from the slice file
#
###

if [ "$1" = "" -a "$2" = "" -a "$3" = "" -a "$4" == "" -a "$5" == "" ]; then
  echo "usage: $0 <path> <basename> <slice number> <extension> <context>"
  echo "$0 tests and if necessary repairs the given slice using Parchive redundancy  files"
  exit 1
fi

if [ "$3" = "0" -o \( "$5" = "operation" -a "$3" = "1" \) ]; then
  exit 0
fi

PAR=par2
SLICE="$1/$2.$3.$4"

if [ ! -r $SLICE ]; then
   echo "`basename $0`: Cannot find or read the slice $SLICE, skiping, Dar will ask user for it"
   exit 0;
fi

echo "$PAR verification slice $SLICE..."
if ! $PAR v "$SLICE" ; then
  echo "trying to repair the slice..."
  if ! $PAR r "$SLICE" ; then
     echo "PAR repairation failed. (read-only filesystem ?)"
     exit 1
  fi
  echo "verifying after reparation..."
  exec $PAR v "$SLICE"
fi
