source: cmtpacman/HEAD/scripts/filter_links.sh @ 59

##set -x

check_external_link ()
{
  file=$1
  shift

  if test -z "${file}"; then return 1 ; fi
  if test ! -L "${file}"; then return 1 ; fi

  a=`ls -l $file | awk '{ print $9 ":" $11}'`

  src=`echo $a | cut -d: -f1`
  dest=`echo $a | cut -d: -f2`

  if test -z "${dest}"; then
    return 1
  fi

  d=`dirname ${src}`
  if test "${d}" = "."; then d=; fi

  hsrc=`(cd ${root}/${d}; pwd)`

  d=`dirname ${dest}`
  if test "${d}" = "."; then d=; fi

  if test -z `echo ${d} | egrep -e '^/'`; then
    hdest=`(cd ${hsrc}/${d}; pwd)`
  else
    hdest=`(cd ${d}; pwd)`
  fi

  while test ! -z `echo ${hdest} | egrep '[.][.]'`; do
    ##echo hdest=${hdest}
    newhdest=`echo ${hdest} | \
      sed -e 's#/[^/]*/[.][.]/#/#g' \
          -e 's#^[^/]*/[.][.]/#/#g' \
          -e 's#/[^/]*/[.][.]$##'`
    if test "${newhdest}" = "${hdest}"; then break; fi
    hdest=${newhdest}
  done

  hsrc=`echo ${hsrc} | sed -e "s#${root}/##" -e "s#${root}##"`
  hdest=`echo ${hdest} | sed -e "s#${root}/##" -e "s#${root}##" | egrep '^/'`

  if test ! -z "${hdest}"; then
    if test -z `egrep -e "${d}" ${here}/keep_links.dat` ; then 
      echo "${src} ${dest}"
      return 0
    fi                                                                                            
  fi

  return 1
}

here=`dirname $0`
if test "${here}" = "."; then here=`pwd`; fi
if test -z "${here}"; then here=`pwd`; fi

root=$1
shift

cd ${root}

links=`find . -type l`

for file in `echo ${links}`; do
  check_external_link ${file}
  status=$?
  if test "${status}" = 0; then
    break
  fi
done