#!/bin/bash

set -e

set -x

if [[ -z $ENGINE_PATH ]]

then

echo "Please set ENGINE_PATH environment variable."

exit 1

fi

# Go to the engine git repo to get the date of the latest commit.

cd $ENGINE_PATH/src/flutter

ENGINE_COMMIT=`git rev-parse HEAD`

echo "Using engine commit: $ENGINE_COMMIT"

if [[ -z $FLUTTER_CLONE_REPO_PATH ]]

then

echo "Please set FLUTTER_CLONE_REPO_PATH environment variable."

exit 1

else

cd $FLUTTER_CLONE_REPO_PATH

fi

if [[ $GIT_BRANCH =~ ^flutter-.*-candidate.*$ ]]

then

# Coming from presubmit and assuming the correct branch has been already checked out.

COMMIT_NO=`git rev-parse HEAD`

else

# Try to get release branch from the checkout.

RELEASE_BRANCH=`git branch -a --contains $ENGINE_COMMIT | grep 'flutter-.*-candidate.*' || true`

if [[ -z $RELEASE_BRANCH ]]

then

# If this is not a release branch commit get latest commit's time for the engine repo.

# Use date based on local time otherwise timezones might get mixed.

LATEST_COMMIT_TIME_ENGINE=`git log -1 --date=local --format="%cd"`

echo "Latest commit time on engine found as $LATEST_COMMIT_TIME_ENGINE"

# Get the time of the youngest commit older than engine commit.

# Git log uses commit date not the author date.

# Before makes the comparison considering the timezone as well.

COMMIT_NO=`git log --before="$LATEST_COMMIT_TIME_ENGINE" -n 1 | grep commit | cut -d ' ' -f2`

else

COMMIT_NO=`git rev-parse $RELEASE_BRANCH`

git checkout $RELEASE_BRANCH

fi

fi

echo "Using the flutter/flutter commit $COMMIT_NO";

git reset --hard $COMMIT_NO

# Write the commit number to a file. This file will be read by the LUCI recipe.

echo "$COMMIT_NO" >> flutter_ref.txt

# Print out the flutter version for troubleshooting

$FLUTTER_CLONE_REPO_PATH/bin/flutter --version -v