1 files changed, 91 insertions, 2 deletions
diff --git a/scripts/checkstyle.sh b/scripts/checkstyle.sh
index 46cba4507..786e81cfe 100644
--- a/scripts/checkstyle.sh
+++ b/scripts/checkstyle.sh
@@ -1,4 +1,4 @@
-# Copyright (c) 2021 Cisco and/or its affiliates.
+# Copyright (c) 2022 Cisco and/or its affiliates.
 # Licensed 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:
@@ -11,4 +11,93 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-exit 0
+#!/bin/bash
+
+set -eEo pipefail
+
+sudo apt-get install -y clang-format-12
+
+CLANG_FORMAT_VER_REGEX='([0-9]+)\.[0-9]+\.[0-9]+'
+CLANG_FORMAT_DIFF="/usr/share/clang/clang-format-diff.py"
+
+if [[ -z ${CHANGE_TARGET} ]]; then
+  DIFF_TARGET="HEAD~1"
+else
+  DIFF_TARGET="origin/${CHANGE_TARGET}...HEAD"
+fi
+
+CLANG_FORMAT_VER=${CLANG_FORMAT_VER:-12}
+GIT_DIFF_ARGS="-U0 --no-color --relative ${DIFF_TARGET}"
+CLANG_FORMAT_DIFF_ARGS="-style file -p1"
+SUFFIX="-${CLANG_FORMAT_VER}"
+
+# Attempt to find clang-format to confirm Clang version.
+if command -v clang-format${SUFFIX} &>/dev/null; then
+  CLANG_FORMAT=clang-format${SUFFIX}
+elif command -v clang-format &>/dev/null; then
+  CLANG_FORMAT=clang-format
+fi
+
+CLANG_FORMAT_VERSION=$(${CLANG_FORMAT} --version)
+echo $CLANG_FORMAT_VERSION
+
+# Confirm that Clang is the expected version.
+if [[ ! $CLANG_FORMAT_VERSION =~ $CLANG_FORMAT_VER_REGEX ]]; then
+  echo "*******************************************************************"
+  echo "* CHECKSTYLE VERSION REGEX CHECK FAILED"
+  echo "* $CLANG_FORMAT_VERSION"
+  echo "*******************************************************************"
+  exit 1
+fi
+
+if [[ ! $CLANG_FORMAT_VER == "${BASH_REMATCH[1]}" ]]; then
+  echo "*******************************************************************"
+  echo "* CHECKSTYLE VERSION CHECK FAILED"
+  echo "* Expected major version $CLANG_FORMAT_VER, found ${BASH_REMATCH[1]}"
+  echo "*******************************************************************"
+  exit 1
+fi
+
+# Attempt to find clang-format-diff.
+if command -v clang-format-diff${SUFFIX} &>/dev/null; then
+  CLANG_FORMAT_DIFF=clang-format-diff${SUFFIX}
+elif command -v clang-format-diff &>/dev/null; then
+  CLANG_FORMAT=clang-format-diff
+elif [ ! -f $CLANG_FORMAT_DIFF ]; then
+  echo "*******************************************************************"
+  echo "* CHECKSTYLE FAILED"
+  echo "* Could not locate the clang-format-diff script"
+  echo "*******************************************************************"
+  exit 1
+fi
+
+in=$(mktemp)
+git diff ${GIT_DIFF_ARGS} ':!*.patch' >${in}
+
+out=$(mktemp)
+cat ${in} | ${CLANG_FORMAT_DIFF} ${CLANG_FORMAT_DIFF_ARGS} >${out}
+rm ${in}
+
+line_count=$(cat ${out} | wc -l)
+
+if [ -t 1 ] && [ -n $(tput colors) ] && [ $(tput colors) -ge 1 ] &&
+  command -v highlight &>/dev/null; then
+  highlight --syntax diff -O ansi ${out}
+else
+  cat ${out}
+fi
+
+rm ${out}
+
+if [ ${line_count} -gt 0 ]; then
+  echo "*******************************************************************"
+  echo "* CHECKSTYLE FAILED"
+  echo "* CONSULT DIFF ABOVE"
+  echo "*******************************************************************"
+  exit 1
+else
+  echo "*******************************************************************"
+  echo "* CHECKSTYLE SUCCESSFULLY COMPLETED"
+  echo "*******************************************************************"
+  exit 0
+fi