qemu: Add the daemonize qemu option to the Knobs structure

This way callers can choose if they want the qemu process to be a daemon
or not.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

qemu.go

@@ -669,6 +669,9 @@ type Knobs struct {
 
 	// NoGraphic completely disables graphic output.
 	NoGraphic bool
+
+	// Daemonize will turn the qemu process into a daemon
+	Daemonize bool
 }
 
 // Config is the qemu configuration structure.
@@ -912,6 +915,10 @@ func (config *Config) appendKnobs() {
 	if config.Knobs.NoGraphic == true {
 		config.qemuParams = append(config.qemuParams, "-nographic")
 	}
+
+	if config.Knobs.Daemonize == true {
+		config.qemuParams = append(config.qemuParams, "-daemonize")
+	}
 }
 
 // LaunchQemu can be used to launch a new qemu instance.

qemu_test.go

@@ -173,13 +173,14 @@ func TestAppendEmptyDevice(t *testing.T) {
 	testAppend(device, "", t)
 }
 
-var knobsString = "-no-user-config -nodefaults -nographic"
+var knobsString = "-no-user-config -nodefaults -nographic -daemonize"
 
 func TestAppendKnobsAllTrue(t *testing.T) {
 	knobs := Knobs{
 		NoUserConfig: true,
 		NoDefaults:   true,
 		NoGraphic:    true,
+		Daemonize:    true,
 	}
 
 	testAppend(knobs, knobsString, t)