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common.sh
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common.sh
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#!/bin/bash
# Copyright 2020 Google LLC
#
# Licensed 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.
function retry_with_backoff {
attempts_left=$1
sleep_seconds=$2
shift 2
command=$@
# store current flag state
flags=$-
# allow a failures to continue
set +e
${command}
exit_code=$?
# restore "e" flag
if [[ ${flags} =~ e ]]
then set -e
else set +e
fi
if [[ $exit_code == 0 ]]
then
return 0
fi
# failure
if [[ ${attempts_left} > 0 ]]
then
echo "failure (${exit_code}), sleeping ${sleep_seconds}..."
sleep ${sleep_seconds}
new_attempts=$((${attempts_left} - 1))
new_sleep=$((${sleep_seconds} * 2))
retry_with_backoff ${new_attempts} ${new_sleep} ${command}
fi
return $exit_code
}
## Helper functionss
function now() { date +"%Y-%m-%d %H:%M:%S" | tr -d '\n'; }
function msg() { println "$*" >&2; }
function println() { printf '%s\n' "$(now) $*"; }
## Helper comment to trigger updated repo dependency release