Implements qemu debug support

qemu/qemu-kernel.go

@@ -67,6 +67,9 @@ type QemuSystem struct {
 	Cpus   int
 	Memory int
 
+	debug bool
+	gdb   string // tcp::1234
+
 	// Timeout works after Start invocation
 	Timeout         time.Duration
 	KilledByTimeout bool
@@ -184,6 +187,10 @@ func (q *QemuSystem) Start() (err error) {
 		"-netdev", "user,id=n1," + hostfwd,
 	}
 
+	if q.debug {
+		qemuArgs = append(qemuArgs, "-gdb", q.gdb)
+	}
+
 	if q.kernel.InitrdPath != "" {
 		qemuArgs = append(qemuArgs, "-initrd", q.kernel.InitrdPath)
 	}
@@ -338,3 +345,8 @@ func (q *QemuSystem) CopyAndRun(user, path string) (output string, err error) {
 
 	return q.Command(user, "chmod +x "+remotePath+" && "+remotePath)
 }
+
+func (q *QemuSystem) Debug(conn string) {
+	q.debug = true
+	q.gdb = conn
+}