delete qmp socket path. Also, clean up unnecessary use of statebag to recieve step values. (#8572)

builder/qemu/builder.go

@@ -639,7 +639,10 @@ func (b *Builder) Run(ctx context.Context, ui packer.Ui, hook packer.Hook) (pack
 	steps = append(steps,
 		new(stepConfigureVNC),
 		steprun,
-		new(stepConfigureQMP),
+		&stepConfigureQMP{
+			VNCUsePassword: b.config.VNCUsePassword,
+			QMPSocketPath:  b.config.QMPSocketPath,
+		},
 		&stepTypeBootCommand{},
 	)
 

builder/qemu/step_configure_qmp.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"log"
+	"os"
 	"time"
 
 	"github.com/digitalocean/go-qemu/qmp"
@@ -19,27 +20,26 @@ import (
 //
 // Produces:
 type stepConfigureQMP struct {
-	monitor *qmp.SocketMonitor
+	monitor        *qmp.SocketMonitor
+	VNCUsePassword bool
+	QMPSocketPath  string
 }
 
 func (s *stepConfigureQMP) Run(ctx context.Context, state multistep.StateBag) multistep.StepAction {
-	config := state.Get("config").(*Config)
 	ui := state.Get("ui").(packer.Ui)
 
-	if !config.VNCUsePassword {
+	if !s.VNCUsePassword {
 		return multistep.ActionContinue
 	}
 
-	msg := fmt.Sprintf("QMP socket at: %s", config.QMPSocketPath)
-	ui.Say(msg)
-	log.Print(msg)
+	ui.Say(fmt.Sprintf("QMP socket at: %s", s.QMPSocketPath))
 
 	// Only initialize and open QMP when we have a use for it.
 	// Open QMP socket
 	var err error
 	var cmd []byte
 	var result []byte
-	s.monitor, err = qmp.NewSocketMonitor("unix", config.QMPSocketPath, 2*time.Second)
+	s.monitor, err = qmp.NewSocketMonitor("unix", s.QMPSocketPath, 2*time.Second)
 	if err != nil {
 		err := fmt.Errorf("Error opening QMP socket: %s", err)
 		state.Put("error", err)
@@ -69,8 +69,8 @@ func (s *stepConfigureQMP) Run(ctx context.Context, state multistep.StateBag) mu
 		ui.Error(err.Error())
 		return multistep.ActionHalt
 	}
-	msg = fmt.Sprintf("QMP Command: %s\nResult: %s", cmd, result)
-	log.Printf(msg)
+
+	log.Printf("QMP Command: %s\nResult: %s", cmd, result)
 
 	// Put QMP monitor in statebag in case there is a use in a following step
 	// Uncomment for future case as it is unused for now
@@ -85,5 +85,9 @@ func (s *stepConfigureQMP) Cleanup(multistep.StateBag) {
 		if err != nil {
 			log.Printf("failed to disconnect QMP: %v", err)
 		}
+		// Delete file associated with qmp socket.
+		if err := os.Remove(s.QMPSocketPath); err != nil {
+			log.Printf("Failed to delete the qmp socket file: %s", err)
+		}
 	}
 }