text: #!/bin/bash -e
  
  # Copyright 2016 tsuru authors. All rights reserved.
  # Use of this source code is governed by a BSD-style
  # license that can be found in the LICENSE file.
  
  status=0
  for f in `git ls-files | xargs grep -L "Copyright" | grep ".go" | grep -v vendor/`
  do
      echo $f
      status=1
  done
  
  if [ $status != 0 ]
  then
     exit $status
  fi
  
  tofix=
  addallyears=
  while [ "${1-}" != "" ]; do
      case $1 in
          "-f" | "--fix")
              tofix=true
              ;;
          "--all")
              addallyears=true
              ;;
      esac
      shift
  done
  
  oldIFS=$IFS
  IFS=$(echo -en "\n\b")
  
  function join_space { 
      IFS=" "
      echo "$*"
  }
  
  for f in $(git ls-files | grep -v vendor/ | grep -v check-license.sh | xargs -I{} bash -c '(egrep -Ho "Copyright [0-9 ]+" {})')
  do
      IFS=":" read file copyright <<< "$f"
      IFS=" " read copy year <<< "$copyright"
      if [ -z $addallyears ]; then
          expectedYears=`git log --diff-filter=A --follow --format=%ad --date=format:%Y -1 -- $file`
      else
          expectedYears=$(join_space $(git log --follow --format=%ad --date=format:%Y -- $file | sort | uniq))
      fi
      if [[ $year != $expectedYears ]];
      then
          echo "$file - Copyright $year, created: $expectedYears"
          if [ -z "$tofix" ]; then
              status=1
          else
              sed -E -i "" "s/Copyright [0-9 ]+/Copyright ${expectedYears} /g" $file
          fi
      fi
  done
  
  exit $status
  