check-license-headers

#!/bin/bash
#
# Copyright (C) Extensible Service Proxy Authors
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
################################################################################
#
# Checks the source code files for proper license headers.

ESP_COPYRIGHT='Copyright (C) Extensible Service Proxy Authors'

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
. ${ROOT}/script/all-utilities \
  || { echo "Cannot load Bash utilities" ; exit 1 ; }

function is_source_code_file() {
  first_line="$(head -1 ${1} | xargs --null)"
  filename="$(echo ${1} |awk -F / '{print $NF}')"
  [[ "${filename}" == 'BUILD' ]] && return 0
  [[ "${first_line}" == '#!/bin/bash' ]] && return 0
  extension="$(echo ${1} |awk -F . '{if (NF>1) {print $NF}}')"
  [[ "${extension}" == "c" ||
     "${extension}" == "cc" ||
     "${extension}" == "h" ||
     "${extension}" == "py" ||
     "${extension}" == "go" ||
     "${extension}" == "pm" ||
     "${extension}" == "bzl" ||
     "${extension}" == "t" ]] && return 0
  return 1
}

for file in $(git ls-files)
do
  base="$(echo ${file} |awk -F / '{print $1}')"
  [[ "${base}" == "google" || "${base}" == "third_party" ]] && continue
  base3="$(echo ${file} |awk -F / '{print $1 "/" $2 "/" $3}')"
  [[ "${base3}" == "tools/src/google" ]] && continue
  [[ "$(basename ${file})" == "check-license-headers" ]] && continue
  if is_source_code_file "${file}"; then
    total_copyright_count="$(head ${file} | grep 'Copyright (C)' | wc -l)"
    esp_copyright_count="$(head ${file} | grep "${ESP_COPYRIGHT}" | wc -l)"
    [[ "${total_copyright_count}" == 1 && "${esp_copyright_count}" == 1 ]] \
      || error_exit "$file has invalid license headers."
  fi
done