AWS: Use s3 sync to optimize upload to s3 when nothing changed

cluster/aws/util.sh

@@ -298,15 +298,20 @@ function upload-server-tars() {
 
   local -r staging_path="devel"
 
-  echo "+++ Staging server tars to S3 Storage: ${AWS_S3_BUCKET}/${staging_path}"
+  local -r local_dir="${KUBE_TEMP}/s3/"
+  mkdir ${local_dir}
 
+  echo "+++ Staging server tars to S3 Storage: ${AWS_S3_BUCKET}/${staging_path}"
   local server_binary_path="${staging_path}/${SERVER_BINARY_TAR##*/}"
-  aws s3 cp "${SERVER_BINARY_TAR}" "s3://${AWS_S3_BUCKET}/${server_binary_path}"
+  cp -a "${SERVER_BINARY_TAR}" ${local_dir}
+  cp -a "${SALT_TAR}" ${local_dir}
+
+  aws s3 sync --exact-timestamps ${local_dir} "s3://${AWS_S3_BUCKET}/${staging_path}/"
+
   aws s3api put-object-acl --bucket ${AWS_S3_BUCKET} --key "${server_binary_path}" --grant-read 'uri="http://acs.amazonaws.com/groups/global/AllUsers"'
   SERVER_BINARY_TAR_URL="${s3_url_base}/${AWS_S3_BUCKET}/${server_binary_path}"
 
   local salt_tar_path="${staging_path}/${SALT_TAR##*/}"
-  aws s3 cp "${SALT_TAR}" "s3://${AWS_S3_BUCKET}/${salt_tar_path}"
   aws s3api put-object-acl --bucket ${AWS_S3_BUCKET} --key "${salt_tar_path}" --grant-read 'uri="http://acs.amazonaws.com/groups/global/AllUsers"'
   SALT_TAR_URL="${s3_url_base}/${AWS_S3_BUCKET}/${salt_tar_path}"
 }
@@ -441,10 +446,10 @@ function kube-up {
 
   find-release-tars
 
-  upload-server-tars
-
   ensure-temp-dir
 
+  upload-server-tars
+
   ensure-iam-profiles
 
   get-password