sha() {

local branch=$1

git rev-parse "$branch"

}

version_from_dockerfile() {

local branch=$1

git show "$branch:Dockerfile" | grep JENKINS_VERSION: | sed -e 's/.*:-\(.*\)}/\1/'

}

master_sha=$(sha master)

alpine_sha=$(sha alpine)

master_version=$(version_from_dockerfile master)

alpine_version=$(version_from_dockerfile alpine)

if ! [ "$master_version" == "$alpine_version" ]; then

echo "Master version '$master_version' does not match alpine version '$alpine_version'"

exit 1

cat << EOF > ../official-images/library/jenkins