#! /bin/sh 
# First line invokes Bourne shell
# ============================================================================
# ABSTRACT:
#	Bourne script for checking/generating checksums for files contained
#	in a specific Medley release directory. Should normally be invoked
#	by ldechecksum and expects the calling script to be connected to
#	the medley installation directory. Also, expects the directory
#	<medleydir>checksumdir to exist. "< W > ..." warning and "< E > ..."
#	error messages will be issued.
#
# SYNOPSIS:
#	checksum -cg dir
#
#	-c	generates a FOO.check file and compares it to FOO.sum.
#	-g	generates a FOO.sum file.
#	NOTE: One of -c or -g is required.
#	dir	the name of the Medley release directory containing files
#		for which checksum checking/generating will be performed.
#
# CHANGES:
#	05-05-89 Carl Gadener : added "trap" to delete created file if 
#				interrupted. Also "FOO.check" files are now
#				deleted after being used.
#	12-14-88 Carl Gadener : Had to rewrite it for Bourne shell because
#				the "foreach" loop in csh doesn't accept
#				enough args.
# ============================================================================
#
if test $# -lt 2
then
   echo "Usage: checksum -cg dir"
   exit 2

else
   case $1 in
      -c) suffix="check"
	  operation="Verifying"
	  ;;
      -g) suffix="sum"
	  operation="Generating checksum for"
	  ;;
      *) echo "Usage: checksum -cg dir"
         exit 2 ;;
   esac
fi

if test -d $2
then
   resultdir=`pwd`/checksumdir
   resultfile=`echo "$2" | sed s/\\\//-/g`	

   # If interrupted be sure to delete created file
   trap "/bin/rm -f $resultdir/$resultfile.$suffix ; exit" 1 2 3 15

   cd $2
   echo "$operation: $2"
   echo "Checksum for directory: $2" > $resultdir/$resultfile.$suffix
   echo "" >> $resultdir/$resultfile.$suffix
   for file in  `/bin/ls -FL | /bin/grep -v "/" `
   do
      echo "E > `sum $file` $file" >> $resultdir/$resultfile.$suffix
   done

   if test "$1" = "-c"	# Verifying
   then
      /bin/diff $resultdir/$resultfile.sum \
		$resultdir/$resultfile.check | grep "<"

   # Remove check-file after check has been done
   /bin/rm -f $resultdir/$resultfile.check
   fi

else
  echo "< W > `pwd`/$2 : Directory not installed"
fi