#!/bin/bash

#

# Copyright 2022 Google LLC

#

# 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

#

# 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.

# `-e` enables the script to automatically fail when a command fails

# `-o pipefail` sets the exit code to the rightmost comment to exit

# with a non-zero

set -eo pipefail

if [ ${BUILD_TYPE} == "presubmit" ]; then

# For presubmit build, we want to know the difference from the

# common commit in origin/main.

GIT_DIFF_ARG="origin/main..."

# Then fetch enough history for finding the common commit.

git fetch origin main --deepen=200

elif [ ${BUILD_TYPE} == "continuous" ]; then

# For continuous build, we want to know the difference in the last

# commit. This assumes we use squash commit when merging PRs.

GIT_DIFF_ARG="HEAD~.."

# Then fetch one last commit for getting the diff.

git fetch origin main --deepen=1

else

# Run everything.

GIT_DIFF_ARG=""

fi

if [ -n ${GIT_DIFF_ARG} ]; then

echo "running git diff ${GIT_DIFF_ARG} *"

git diff ${GIT_DIFF_ARG} *

fi