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#!/bin/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.
# A bash script to wait for a condition to be true.
#
# usage:
# condwait [ MAX-WAIT [ POST-WAIT ] ] CONDITION
#
# CONDITION is the ('test' command) condition to wait for. (It may contain white space.)
#
# MAX-WAIT is the maximum number of seconds to wait for the condition. If it is omitted, it defaults to 60.
#
# POST-WAIT is the number of seconds to wait after the condition is true. If it is omitted, it defaults to 0.
#
# The script exits with status 0 when the condition is seen to be true. It exits with status 1 if the condition
# is not seen to be true and the maximum wait has expired.
WAIT=60
POST_WAIT=0
if [[ "$1" = "" ]] ; then
echo "usage: condwait [ MAX-WAIT [ POST-WAIT ] ] TEST-CONDTION" >&2
exit 1
fi
X=$( echo "$1" | sed 's/x/yy/g' | sed 's/[^0-9]/x/g' )
if [[ "$X" = "$1" ]] ; then
WAIT=$1
shift
if [[ "$1" = "" ]] ; then
echo "usage: condwait [ MAX-WAIT [ POST-WAIT ] ] TEST-CONDTION" >&2
exit 1
fi
X=$( echo "$1" | sed 's/x/yy/g' | sed 's/[^0-9]/x/g' )
if [[ "$X" = "$1" ]] ; then
POST_WAIT=$1
shift
fi
fi
if [[ "$1" = "" ]] ; then
echo "usage: condwait [ MAX-WAIT [ POST-WAIT ] ] TEST-CONDTION" >&2
exit 1
fi
while (( WAIT > 0 ))
do
if test $*
then
if (( POST_WAIT > 0 ))
then
sleep $POST_WAIT
fi
exit 0
fi
sleep 1
let WAIT=WAIT-1
done
exit 1
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