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#!/usr/bin/env bash
# Stop script on NZEC
set -e
# Stop script if unbound variable found (use ${var:-} if intentional)
set -u
say_err() {
printf "%b\n" "Error: $1" >&2
}
showHelp() {
echo "Usage: $scriptName [OPTIONS] [IMAGE_NAME[:TAG|@DIGEST]]"
echo
echo "Initializes Docker by:"
echo " - Emitting the version of Docker that is being used"
echo " - Removing all containers and images that exist on the machine"
echo " - Ensuring the latest copy of the specified image exists on the machine"
echo
echo "Options:"
echo " -r, --retryCount Number of times to retry pulling image on error"
echo " -w, --waitFactor Time (seconds) to wait between pulls (time is multiplied each iteration)"
}
# Executes a command and retries if it fails.
execute() {
local count=0
until "$@"; do
local exit=$?
count=$(( $count + 1 ))
if [ $count -lt $retries ]; then
local wait=$(( waitFactor ** (( count - 1 )) ))
echo "Retry $count/$retries exited $exit, retrying in $wait seconds..."
sleep $wait
else
say_err "Retry $count/$retries exited $exit, no more retries left."
return $exit
fi
done
return 0
}
scriptName=$0
retries=5
waitFactor=6
image=
while [ $# -ne 0 ]; do
name=$1
case $name in
-h|--help)
showHelp
exit 0
;;
-r|--retryCount)
shift
retries=$1
;;
-w|--waitFactor)
shift
waitFactor=$1
;;
-*)
say_err "Unknown option: $1"
exit 1
;;
*)
if [ ! -z "$image" ]; then
say_err "Unknown argument: \`$name\`"
exit 1
fi
image="$1"
;;
esac
shift
done
# Capture Docker version for diagnostic purposes
docker --version
echo
echo "Cleaning Docker Artifacts"
sourceDir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
"$sourceDir/cleanup-docker.sh"
echo
if [ ! -z "$image" ]; then
echo "Pulling Docker image $image"
execute docker pull $image
fi
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