prevent panics when cleaning up resources that haven't been created.

builder/oracle/classic/step_create_instance.go

@@ -57,18 +57,22 @@ func (s *stepCreateInstance) Run(_ context.Context, state multistep.StateBag) mu
 }
 
 func (s *stepCreateInstance) Cleanup(state multistep.StateBag) {
+	instanceID, ok := state.GetOk("instance_id")
+	if !ok {
+		return
+	}
+
 	// terminate instance
 	ui := state.Get("ui").(packer.Ui)
 	client := state.Get("client").(*compute.ComputeClient)
 	config := state.Get("config").(*Config)
-	imID := state.Get("instance_id").(string)
 
 	ui.Say("Terminating source instance...")
 
 	instanceClient := client.Instances()
 	input := &compute.DeleteInstanceInput{
 		Name: config.ImageName,
-		ID:   imID,
+		ID:   instanceID.(string),
 	}
 
 	err := instanceClient.DeleteInstance(input)

builder/oracle/classic/step_create_ip_reservation.go

@@ -42,12 +42,16 @@ func (s *stepCreateIPReservation) Run(_ context.Context, state multistep.StateBa
 }
 
 func (s *stepCreateIPReservation) Cleanup(state multistep.StateBag) {
+	ipResName, ok := state.GetOk("ipres_name")
+	if !ok {
+		return
+	}
+
 	ui := state.Get("ui").(packer.Ui)
 	ui.Say("Cleaning up IP reservations...")
 	client := state.Get("client").(*compute.ComputeClient)
 
-	ipResName := state.Get("ipres_name").(string)
-	input := compute.DeleteIPReservationInput{Name: ipResName}
+	input := compute.DeleteIPReservationInput{Name: ipResName.(string)}
 	ipClient := client.IPReservations()
 	err := ipClient.DeleteIPReservation(&input)
 	if err != nil {

builder/oracle/classic/step_security.go

@@ -97,6 +97,15 @@ func (s *stepSecurity) Run(_ context.Context, state multistep.StateBag) multiste
 }
 
 func (s *stepSecurity) Cleanup(state multistep.StateBag) {
+	secRuleName, ok := state.GetOk("security_rule_name")
+	if !ok {
+		return
+	}
+	secListName, ok := state.GetOk("security_list")
+	if !ok {
+		return
+	}
+
 	client := state.Get("client").(*compute.ComputeClient)
 	ui := state.Get("ui").(packer.Ui)
 	config := state.Get("config").(*Config)
@@ -105,37 +114,38 @@ func (s *stepSecurity) Cleanup(state multistep.StateBag) {
 
 	namePrefix := fmt.Sprintf("/Compute-%s/%s/", config.IdentityDomain, config.Username)
 	// delete security rules that Packer generated
-	secRuleName := state.Get("security_rule_name").(string)
 	secRulesClient := client.SecRules()
-	ruleInput := compute.DeleteSecRuleInput{Name: namePrefix + secRuleName}
+	ruleInput := compute.DeleteSecRuleInput{Name: namePrefix + secRuleName.(string)}
 	err := secRulesClient.DeleteSecRule(&ruleInput)
 	if err != nil {
 		ui.Say(fmt.Sprintf("Error deleting the packer-generated security rule %s; "+
-			"please delete manually. (error: %s)", secRuleName, err.Error()))
+			"please delete manually. (error: %s)", secRuleName.(string), err.Error()))
 	}
 
 	// delete security list that Packer generated
-	secListName := state.Get("security_list").(string)
 	secListClient := client.SecurityLists()
-	input := compute.DeleteSecurityListInput{Name: namePrefix + secListName}
+	input := compute.DeleteSecurityListInput{Name: namePrefix + secListName.(string)}
 	err = secListClient.DeleteSecurityList(&input)
 	if err != nil {
 		ui.Say(fmt.Sprintf("Error deleting the packer-generated security list %s; "+
-			"please delete manually. (error : %s)", secListName, err.Error()))
+			"please delete manually. (error : %s)", secListName.(string), err.Error()))
 	}
 
 	// Some extra cleanup if we used the winRM communicator
 	if config.Comm.Type == "winrm" {
 		// Delete the packer-generated application
-		application := state.Get("winrm_application").(string)
+		application, ok := state.GetOk("winrm_application")
+		if !ok {
+			return
+		}
 		applicationClient := client.SecurityApplications()
 		deleteApplicationInput := compute.DeleteSecurityApplicationInput{
-			Name: namePrefix + application,
+			Name: namePrefix + application.(string),
 		}
 		err = applicationClient.DeleteSecurityApplication(&deleteApplicationInput)
 		if err != nil {
 			ui.Say(fmt.Sprintf("Error deleting the packer-generated winrm security application %s; "+
-				"please delete manually. (error : %s)", application, err.Error()))
+				"please delete manually. (error : %s)", application.(string), err.Error()))
 		}
 	}
 

builder/oracle/classic/step_snapshot.go

@@ -15,7 +15,6 @@ type stepSnapshot struct {
 
 func (s *stepSnapshot) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
 	// get variables from state
-	s.cleanupSnap = false
 	ui := state.Get("ui").(packer.Ui)
 	ui.Say("Creating Snapshot...")
 	config := state.Get("config").(*Config)
@@ -39,7 +38,6 @@ func (s *stepSnapshot) Run(_ context.Context, state multistep.StateBag) multiste
 		state.Put("error", err)
 		return multistep.ActionHalt
 	}
-	s.cleanupSnap = true
 	state.Put("snapshot", snap)
 	ui.Message(fmt.Sprintf("Created snapshot: %s.", snap.Name))
 	return multistep.ActionContinue
@@ -47,13 +45,16 @@ func (s *stepSnapshot) Run(_ context.Context, state multistep.StateBag) multiste
 
 func (s *stepSnapshot) Cleanup(state multistep.StateBag) {
 	// Delete the snapshot
-	ui := state.Get("ui").(packer.Ui)
-	if !s.cleanupSnap {
+	var snap *compute.Snapshot
+	if snapshot, ok := state.GetOk("snapshot"); ok {
+		snap = snapshot.(*compute.Snapshot)
+	} else {
 		return
 	}
+
+	ui := state.Get("ui").(packer.Ui)
 	ui.Say("Deleting Snapshot...")
 	client := state.Get("client").(*compute.ComputeClient)
-	snap := state.Get("snapshot").(*compute.Snapshot)
 	snapClient := client.Snapshots()
 	snapInput := compute.DeleteSnapshotInput{
 		Snapshot:     snap.Name,