#!/bin/sh
 
searchdir=/root
log=/tmp/filescan
tmp=/tmp/filescan.tmp
 
i=0
for arg in $* ;
do
 if test $i -eq 1
 then
  searchdir=$arg
  break
 fi
 if test "$arg" = "-d"
 then
  i=1
 fi
done
 
if test -e $tmp
then
 echo "The script is already running"
 exit 1
elif ! test -e $searchdir || ! test -d $searchdir
 then
 echo "No directory given for scanning or directory path is wrong ($searchdir)"
 exit 1
fi
 
if test "$1" = "initial"
then
 touch $log
 find $searchdir -type f -exec md5sum '{}' > $log \;
elif test "$1" = "scan"
then
 if test -e $log
 then
  find $searchdir -type f -exec md5sum '{}' > $tmp \;
  oldsum=$(md5sum $log | awk -F "\s" '{print $1}')
  newsum=$(md5sum $tmp | awk -F "\s" '{print $1}')
  if test "$oldsum" = "$newsum"
  then
   echo "No changes in searchdir $searchdir"
  else
   echo "New or changed files in $searchdir"
   echo "old    $oldsum"
   echo "new    $newsum"
  fi
  rm $tmp
 else
  echo "File with hashes not found. You might want to run with initial parameter to create this file"
  exit 1
 fi
else
 echo "Usage    :       scandir initial|scan [-d /path/to/scan]"
 echo "         First argument must be either initial or scan."
 echo "         -d is not mandatory"
 echo "initial  :       the script scans the \$searchdir and creates hashes of files"
 echo "scan     :       the script scans \$searchdir for changed/new files"
 echo "-d       :       specifies the \$searchdir as argument."
 echo "         If not given the default value $searchdir is used"
fi
exit 0