also use config.SSHPrivateKey for azure-arm builds

builder/azure/arm/builder.go

@@ -229,7 +229,7 @@ func (b *Builder) Run(ui packer.Ui, hook packer.Hook, cache packer.Cache) (packe
 		ui.Message(fmt.Sprintf("temp admin user: '%s'", b.config.UserName))
 		ui.Message(fmt.Sprintf("temp admin password: '%s'", b.config.Password))
 
-		if b.config.sshPrivateKey != "" {
+		if len(b.config.Comm.SSHPrivateKey) != 0 {
 			debugKeyPath := fmt.Sprintf("%s-%s.pem", b.config.PackerBuildName, b.config.tmpComputeName)
 			ui.Message(fmt.Sprintf("temp ssh key: %s", debugKeyPath))
 
@@ -282,7 +282,7 @@ func (b *Builder) writeSSHPrivateKey(ui packer.Ui, debugKeyPath string) {
 	defer f.Close()
 
 	// Write the key out
-	if _, err := f.Write([]byte(b.config.sshPrivateKey)); err != nil {
+	if _, err := f.Write(b.config.Comm.SSHPrivateKey); err != nil {
 		ui.Say(fmt.Sprintf("Error saving debug key: %s", err))
 		return
 	}
@@ -333,7 +333,6 @@ func (b *Builder) getBlobAccount(ctx context.Context, client *AzureClient, resou
 
 func (b *Builder) configureStateBag(stateBag multistep.StateBag) {
 	stateBag.Put(constants.AuthorizedKey, b.config.sshAuthorizedKey)
-	stateBag.Put(constants.PrivateKey, b.config.sshPrivateKey)
 
 	stateBag.Put(constants.ArmTags, b.config.AzureTags)
 	stateBag.Put(constants.ArmComputeName, b.config.tmpComputeName)

builder/azure/arm/builder_test.go

@@ -15,7 +15,6 @@ func TestStateBagShouldBePopulatedExpectedValues(t *testing.T) {
 
 	var expectedStateBagKeys = []string{
 		constants.AuthorizedKey,
-		constants.PrivateKey,
 
 		constants.ArmTags,
 		constants.ArmComputeName,

builder/azure/arm/config.go

@@ -143,7 +143,6 @@ type Config struct {
 
 	// Authentication with the VM via SSH
 	sshAuthorizedKey string
-	sshPrivateKey    string
 
 	// Authentication with the VM via WinRM
 	winrmCertificate string
@@ -329,7 +328,7 @@ func setSshValues(c *Config) error {
 			publicKey.Type(),
 			base64.StdEncoding.EncodeToString(publicKey.Marshal()),
 			time.Now().Format(time.RFC3339))
-		c.sshPrivateKey = string(privateKeyBytes)
+		c.Comm.SSHPrivateKey = privateKeyBytes
 
 	} else {
 		sshKeyPair, err := NewOpenSshKeyPair()
@@ -338,7 +337,7 @@ func setSshValues(c *Config) error {
 		}
 
 		c.sshAuthorizedKey = sshKeyPair.AuthorizedKey()
-		c.sshPrivateKey = sshKeyPair.PrivateKey()
+		c.Comm.SSHPrivateKey = sshKeyPair.PrivateKey()
 	}
 
 	return nil

builder/azure/arm/openssh_key_pair.go

@@ -49,11 +49,11 @@ func (s *OpenSshKeyPair) AuthorizedKey() string {
 		time.Now().Format(time.RFC3339))
 }
 
-func (s *OpenSshKeyPair) PrivateKey() string {
-	privateKey := string(pem.EncodeToMemory(&pem.Block{
+func (s *OpenSshKeyPair) PrivateKey() []byte {
+	privateKey := pem.EncodeToMemory(&pem.Block{
 		Type:  "RSA PRIVATE KEY",
 		Bytes: x509.MarshalPKCS1PrivateKey(s.privateKey),
-	}))
+	})
 
 	return privateKey
 }