add get windows default credentials to oci builder

builder/oracle/oci/builder.go

@@ -58,6 +58,11 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 		},
 		&stepCreateInstance{},
 		&stepInstanceInfo{},
+		&stepGetDefaultCredentials{
+			Debug:     b.config.PackerDebug,
+			Comm:      &b.config.Comm,
+			BuildName: b.config.PackerBuildName,
+		},
 		&communicator.StepConnect{
 			Config: &b.config.Comm,
 			Host:   ocommon.CommHost,

builder/oracle/oci/driver_oci.go

@@ -112,6 +112,17 @@ func (d *driverOCI) GetInstanceIP(id string) (string, error) {
 	return *vnic.PublicIp, nil
 }
 
+func (d *driverOCI) GetInstanceInitialCredentials(id string) (string, string, error) {
+	credentials, err := d.computeClient.GetWindowsInstanceInitialCredentials(context.TODO(), core.GetWindowsInstanceInitialCredentialsRequest{
+		InstanceId: &id,
+	})
+	if err != nil {
+		return "", "", err
+	}
+
+	return *credentials.InstanceCredentials.Username, *credentials.InstanceCredentials.Password, err
+}
+
 // TerminateInstance terminates a compute instance.
 func (d *driverOCI) TerminateInstance(id string) error {
 	_, err := d.computeClient.TerminateInstance(context.TODO(), core.TerminateInstanceRequest{

builder/oracle/oci/step_get_default_credentials.go

@@ -0,0 +1,62 @@
+package oci
+
+import (
+	"context"
+	"fmt"
+	"log"
+
+	commonhelper "github.com/hashicorp/packer/helper/common"
+	"github.com/hashicorp/packer/helper/communicator"
+	"github.com/hashicorp/packer/helper/multistep"
+	"github.com/hashicorp/packer/packer"
+)
+
+type stepGetDefaultCredentials struct {
+	Debug     bool
+	Comm      *communicator.Config
+	BuildName string
+}
+
+func (s *stepGetDefaultCredentials) Run(_ context.Context, state multistep.StateBag) multistep.StepAction {
+	var (
+		driver = state.Get("driver").(*driverOCI)
+		ui     = state.Get("ui").(packer.Ui)
+		id     = state.Get("instance_id").(string)
+	)
+
+	// Skip if we're not using winrm
+	if s.Comm.Type != "winrm" {
+		log.Printf("[INFO] Not using winrm communicator, skipping get password...")
+		return multistep.ActionContinue
+	}
+
+	// If we already have a password, skip it
+	if s.Comm.WinRMPassword != "" {
+		ui.Say("Skipping waiting for password since WinRM password set...")
+		return multistep.ActionContinue
+	}
+
+	username, password, err := driver.GetInstanceInitialCredentials(id)
+	if err != nil {
+		err = fmt.Errorf("Error getting instance's credentials: %s", err)
+		ui.Error(err.Error())
+		state.Put("error", err)
+		return multistep.ActionHalt
+	}
+	s.Comm.WinRMPassword = password
+	s.Comm.WinRMUser = username
+
+	if s.Debug {
+		ui.Message(fmt.Sprintf(
+			"[DEBUG] (OCI default credentials): Credentials (since debug is enabled): %s", password))
+	}
+
+	// store so that we can access this later during provisioning
+	commonhelper.SetSharedState("winrm_password", s.Comm.WinRMPassword, s.BuildName)
+
+	return multistep.ActionContinue
+}
+
+func (s *stepGetDefaultCredentials) Cleanup(state multistep.StateBag) {
+	// no cleanup
+}