function get_pacman_file_version ()
{
  old_file=$1
  shift

  pacman_file_version=1
  if test -f ${old_file};  then
    pacman_file_version=`grep description ${old_file} | egrep '[(]v' | sed -e 's#.*(v##' -e 's#).*##'`
    if test "${pacman_file_version}" = ""; then
      pacman_file_version=1
    else
      pacman_file_version=`expr ${pacman_file_version} + 1`
    fi
  fi

  echo "(v${pacman_file_version})"
}

function build_one_project ()
{
  p_id=`basename ${project_path}`
  p_name=`dirname ${project_path}`
  p_name=`basename ${p_name}`

  # echo "p_id=${p_id} p_name=${p_name} "

  pacman_base_filename=${p_name}-${p_id}${platform_opt}
  pacman_filename=${pacman_base_filename}.pacman

  pacman_file_version=`get_pacman_file_version ${cache_dir}/${pacman_filename}`

  if test -f ${cache_dir}/${pacman_filename};  then
    mv ${cache_dir}/${pacman_filename} ${cache_dir}/${pacman_filename}.bak
    if test ! $? = 0; then
      echo "failed to rename ${cache_dir}/${pacman_filename} to ${cache_dir}/${pacman_filename}.bak"
      exit 1
    fi
  fi

  if test -f ${project_path}/cmt/project.cmt; then
    download_filename="${pacman_base_filename}"
    download_text="download = { '*':'${download_filename}.tar.gz' }"
  fi

  cat <<EOF >|${cache_dir}/${pacman_filename}

description='Project description for ${p_name} ${p_id} ${platform_opt} ${pacman_file_version}'

url = 'http://atlas.web.cern.ch/Atlas/GROUPS/SOFTWARE/OO/Development/'

depends = [ '${previous}' ]

usePackageRoot = 0

source = '${source}'
${download_text}

paths = [ ['CMTPATH', '\$PACMAN_INSTALLATION/${p_name}/${p_id}'] ]

EOF

  if test -f ${project_path}/cmt/project.cmt; then

    echo "Constructing the tar ball of the project file"

    mkdir -p ${tempcopydir}/${p_name}/${p_id}
    cp -R ${project_path}/cmt ${tempcopydir}/${p_name}/${p_id}
    (cd ${tempcopydir}; tar czvf ${kits_dir}/${download_filename}.tar.gz ${p_name} --exclude=CVS)

  fi

  previous="${p_name}-${p_id}${platform_opt}"
}

#---------------
# Prepare arguments and options
#
platform=
platform_opt=

while test ! $# = 0; do

  if test "$1" = "-platform"; then
    shift
    platform=$1
    platform_opt="-${platform}"
  fi
  shift
done

cmtversion=`cmt version`

if test "${CMTPATH}" = ""; then
  echo "Please define first CMTPATH"
  exit 1
fi

#---------------

#---------------
# Prepare the pacman cache environment
#
if test "${PACMAN_CACHE}" = ""; then
  echo "Please define first the PACMAN_CACHE"
  exit 1
fi

cache_dir=${PACMAN_CACHE}/cache
kits_dir=${PACMAN_CACHE}/kits
source='../kits'

if test ! -d ${cache_dir}; then
  mkdir -p ${cache_dir}
fi

if test ! -d ${kits_dir}; then
  mkdir -p ${kits_dir}
fi
#---------------


#---------------
# Revert the order of CMTPATH (ie of projects)
#
reverse=
for f in `echo ${CMTPATH} | sed -e 's#[:]# #g'`; do
  reverse="${f} ${reverse}"
done
#---------------

#---------------
# Prepare temporary file management
#
tempprefix=/tmp/CMT$$
if test ! "${TMP}" = ""; then
  tempprefix=${TMP}/CMT$$
fi

tempcopydir=${tempprefix}/c$$

trap "if test -d ${tempprefix} ; then chmod -R +w ${tempprefix}; fi; /bin/rm -rf ${tempprefix}" 0 1 2 15

if test -d ${tempprefix} ; then chmod -R +w ${tempprefix}; fi
/bin/rm -rf ${tempprefix}
#---------------

#---------------
# Loop over projects in reverse order
#
previous="CMTCONFIG-${cmtversion}${platform_opt}"

for f in `echo ${reverse}`; do
  echo "--------------------------------------------"
  echo "Building kit for project_path=${f}"
  project_path=${f}
  build_one_project
done
#---------------