| #!/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 |