commands: Cleanup Requests after command execution returns

commands/command.go

@@ -97,6 +97,14 @@ func (c *Command) Call(req Request) Response {
 		return res
 	}
 
+	// clean up the request (close the readers, e.g. fileargs)
+	// NOTE: this means commands can't expect to keep reading after cmd.Run returns (in a goroutine)
+	err = req.Cleanup()
+	if err != nil {
+		res.SetError(err, ErrNormal)
+		return res
+	}
+
 	res.SetOutput(output)
 	return res
 }