Imports github.com/hashicorp/go-multierror github.com/hashicorp/go-version github.com/mitchellh/iochan github.com/mitchellh/packer/template github.com/mitchellh/packer/template/interpolate Standard library imports bytes crypto/sha256 encoding/hex errors fmt io io/ioutil log os os/exec os/signal path/filepath runtime sort strings sync syscall testing time unicode