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