scripts/pre-commit/check_makefiles_for_tabs.sh

#!/bin/bash

#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

# check_makefiles_for_tabs.sh

# Iterate over all files passed as arguments by pre-commit
for makefile in "$@"; do
  # Check if the file exists and is a regular file
  if [[ -f "$makefile" ]]; then
    if grep -P '^\s' "$makefile" | grep -vP '^\t' > /dev/null; then
      echo "Error: File '$makefile' contains spaces at the beginning of lines instead of tabs."
      exit 1
    fi
  fi
done
exit 0