Imports github.com/kardianos/osext github.com/mitchellh/packer/packer github.com/mitchellh/packer/command github.com/mitchellh/prefixedio github.com/hashicorp/go-checkpoint github.com/mitchellh/panicwrap github.com/mitchellh/cli github.com/mitchellh/packer/packer/plugin Standard library imports encoding/json fmt io io/ioutil log math/rand os os/exec path/filepath runtime strings sync syscall time os/signal