CI Build script for workspace cleanup

src/ci/env/build-info.txt

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+CIBUILD=1

src/ci/scripts/prepareWorkspace.sh

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+#!/usr/bin/env bash
+#
+#  Licensed to the Apache Software Foundation (ASF) under one
+#  or more contributor license agreements.  See the NOTICE file
+#  distributed with this work for additional information
+#  regarding copyright ownership.  The ASF licenses this file
+#  to you 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.
+#
+#  Author: Martin Stockhammer <martin_s@apache.org>
+#  Date:   2017-05-24
+#
+#  Clears the workspace, if the build number is higher
+#  for automatic workspace cleanup on the build slaves
+#
+#  To request a workspace cleanup increase the number for CIBUILD
+#  in the file ../env/build-info.txt and
+
+## 
+BUILDINFO_DIR=${WORKSPACE}/ci
+BUILDINFO_FILE=${BUILDINFO_DIR}/buildinfo.sh
+REQ_BUILDINFO_FILE=$(dirname $0)/../env/build-info.txt
+git checkout ${REQ_BUILDINFO_FILE}
+if [ -f ${REQ_BUILDINFO_FILE} ]; then
+  . ${REQ_BUILDINFO_FILE}
+else
+  CIBUILD=0
+fi
+REQUESTED_BUILD=${CIBUILD}
+CIBUILD=0
+if [ -f ${BUILDINFO_FILE} ]; then
+  . ${BUILDINFO_FILE}
+fi
+if [ ${CIBUILD} -lt ${REQUESTED_BUILD} ]; then
+  echo "Clearing workspace"
+  rm -rf ${WORKSPACE}/*
+  mkdir -p ${BUILDINFO_DIR}
+  echo "CIBUILD=${REQUESTED_BUILD}" >${BUILDINFO_FILE}
+fi