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Bash script to wait until a vagrant box is ready
#! /bin/bash
# Sleep until we can successfully SSH into a vagrant box.
# eg. $ wait_for_vagrant devbox && vagrant ssh devbox --command 'cd project && ./manage.py runserver'
# Uses doublinng backoff while waiting
# with_backoff() adapted from http://stackoverflow.com/a/8351489
# Retries a command a configurable number of times with backoff.
#
# The retry count is given by ATTEMPTS (default 5), the initial backoff
# timeout is given by TIMEOUT in seconds (default 1.)
#
# Successive backoffs double the timeout.
with_backoff() {
local max_attempts=${ATTEMPTS-5}
local timeout=${TIMEOUT-1}
local attempt=0
local exitCode=0
while [ $attempt -lt $max_attempts ]
do
set +e
"$@"
exitCode=$?
set -e
if [ $exitCode -eq 0 ]
then
break
fi
echo "Failure! Retrying in $timeout.." 1>&2
sleep $timeout
attempt=$(( attempt + 1 ))
timeout=$(( timeout * 2 ))
done
if [ $exitCode -ne 0 ]
then
echo "You've failed me for the last time! ($@)" 1>&2
fi
return $exitCode
}
VAGRANT_BOX=${1:-default}
ATTEMPTS=${ATTEMPTS:-10}
export ATTEMPTS
with_backoff vagrant ssh $VAGRANT_BOX --command 'exit';
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