Imports github.com/hashicorp/go-checkpoint github.com/hashicorp/go-multierror github.com/hashicorp/go-version github.com/hashicorp/packer/template github.com/hashicorp/packer/template/interpolate github.com/hashicorp/packer/version github.com/mitchellh/iochan Standard library imports bufio bytes context 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