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