code: function(cb_) {
        console.log(THRUST_VERSION_PATH)
        fs.readFile(THRUST_VERSION_PATH, function(err, data) {
          if(err && err.code !== 'ENOENT') {
            return cb_(err);
          }
          else if(err && err.code === 'ENOENT') {
            fs.remove(THRUST_PATH, cb_);
          }
          else {
            if(data.toString() === THRUST_VERSION) {
              /* We're done here! */
              return cb_(common.err('thrust-' + THRUST_VERSION + 
                                    ' already installed in ' + 
                                    path.join(THRUST_PATH),
                                    'bootstrap:already_installed'));
            }
            else {
              fs.remove(THRUST_PATH, cb_);
            }
          }
        });
      }
docs: /* Check for the THRUST_VERSION_PATH or remove it