#!/bin/sh

# Resource Impl: http://concourse.ci/implementing-resources.html#in:-fetch-a-given-resource
set -e

exec 3>&1 # make stdout available as fd 3 for the result
exec 1>&2 # redirect all output to stderr for logging

dest=$1

if [ -z "$dest" ]; then
  echo "usage: $0 <path/to/volume>"
  exit 1
fi
#######################################

# parse incoming config data
payload=`cat`
bucket=$(echo "$payload" | jq -r '.source.bucket')
options=$(echo "$payload" | jq -r '.source.options // [] | join(" ")')

# export for `aws` cli
AWS_ACCESS_KEY_ID=$(echo "$payload" | jq -r '.source.access_key_id')
AWS_SECRET_ACCESS_KEY=$(echo "$payload" | jq -r '.source.secret_access_key')

# Due to precedence rules, must be unset to support AWS IAM Roles.
if [ -n "$AWS_ACCESS_KEY_ID" ] && [ -n "$AWS_SECRET_ACCESS_KEY" ]; then
  export AWS_ACCESS_KEY_ID=$AWS_ACCESS_KEY_ID
  export AWS_SECRET_ACCESS_KEY=$AWS_SECRET_ACCESS_KEY
fi

echo "Downloading from S3..."
eval aws s3 sync "s3://$bucket" $dest $options
echo "...done."

source "$(dirname $0)/emit.sh" >&3