Imports github.com/hashicorp/packer/common github.com/hashicorp/packer/helper/config github.com/hashicorp/packer/packer github.com/hashicorp/packer/template/interpolate github.com/mitchellh/mapstructure github.com/mitchellh/multistep Standard library imports bytes errors fmt io io/ioutil log os os/exec path/filepath strings syscall time