#!/bin/sh

disallowed_files=""

while read -r old_rev new_rev ref
do
  while IFS= read -r file
  do
    case $file in
      */*)
        disallowed_files="${disallowed_files}${file} "
        ;;
    esac
  done <<EOF
$(git diff --name-only "$old_rev" "$new_rev")
EOF
done

if [ -n "$disallowed_files" ]; then
  echo "Pushing files in folders is not allowed:"
  for file in $disallowed_files; do
    echo "  $file"
  done
  exit 1
fi