#!/bin/bash
  
  # This program searches within a directory for soft links that
  # appear to be created by 'create_data_link.pl' to a 'storage/' subdirectory,
  # and it removes both the soft links and the things they point to.
  # for instance, if you have a soft link 
  #   foo/egs/1.1.egs -> storage/2/1.1.egs
  # it will remove both foo/egs/storage/2/1.1.egs, and foo/egs/1.1.egs.
  
  ret=0
  
  dry_run=false
  
  if [ "$1" == "--dry-run" ]; then
    dry_run=true
    shift
  fi
  
  if [ $# == 0 ]; then
    echo "Usage:  $0 [--dry-run] <list-of-directories>"
    echo "e.g.: $0 exp/nnet4a/egs/"
    echo " Removes from any subdirectories of the command-line arguments, soft links that "
    echo " appear to have been created by utils/create_data_link.pl, as well as the things"
    echo " that those soft links point to.  Will typically be called on a directory prior"
    echo " to 'rm -r' on that directory, to ensure that data that was distributed on other"
    echo " volumes also gets deleted."
    echo " With --dry-run, just prints what it would do."
  fi
  
  for dir in $*; do
    if [ ! -d $dir ]; then
      echo "$0: not a directory: $dir"
      ret=1
    else
      for subdir in $(find $dir -type d); do
        if [ -d $subdir/storage ]; then
          for x in $(ls $subdir); do
            f=$subdir/$x
            if [ -L $f ] && [[ $(readlink $f) == storage/* ]]; then
              target=$subdir/$(readlink $f)
              if $dry_run; then
                echo rm $f $target
              else
                rm $f $target
              fi
            fi
          done
        fi
      done
    fi
  done
  
  exit $ret