check size of written json

command/connect/envoy/exec_windows.go

@@ -42,11 +42,15 @@ func makeBootstrapPipe(bootstrapJSON []byte) (string, error) {
 	}
 
 	// Write the config
-	_, err = pipeConn.Write(bootstrapJSON)
+	n, err = pipeConn.Write(bootstrapJSON)
 	if err != nil {
 		return pipeFile, err
 	}
 
+	if n < len(bootstrapJSON) {
+		return pipeFile, fmt.Errorf("failed writing boostrap to child STDIN: %s", err)
+	}
+
 	// We can't wait for the process since we need to exec into Envoy before it
 	// will be able to complete so it will be remain as a zombie until Envoy is
 	// killed then will be reaped by the init process (pid 0). This is all a bit