Fix region handling for the provider

docs/index.md

@@ -144,8 +144,6 @@ See [OpenStack configuration documentation](https://docs.openstack.org/python-op
 
 ## Configuration Reference
 
--> **Note:** The `region`, `tenant_id`, `domain_id`, `user_id` arguments has been deprecated and `tenant_name`, `domain_name` changed to be `required`. Please update your configurations as it might be removed in the future releases.
-
 The following arguments are supported:
 
 * `access_key` - (Optional) The access key of the OpenTelekomCloud cloud to use.
@@ -166,10 +164,14 @@ The following arguments are supported:
 * `user_name` - (Optional) The Username to login with. If omitted, the
   `OS_USERNAME` environment variable is used.
 
-* `tenant_name` - (Required) The Name of the Tenant (Identity v2) or Project
+* `tenant_name` - (Optional) The Name of the Tenant (Identity v2) or Project
   (Identity v3) to login with. If omitted, the `OS_TENANT_NAME` or
   `OS_PROJECT_NAME` environment variable are used.
 
+* `region` - (Optional) The name of the region to be used. Required for some resources
+  (e.g. `s3_bucket`) in case no tenant name provided and no region is defined in the
+  resource. If omitted, the `OS_REGION` or `OS_REGION_NAME` environment variables are used.
+
 * `password` - (Optional) The Password to login with. If omitted, the
   `OS_PASSWORD` environment variable is used.
 
@@ -181,7 +183,7 @@ The following arguments are supported:
 
 * `security_token` - (Optional) Security token to use for OBS federated authentication.
 
-* `domain_name` - (Required) The Name of the Domain to scope to (Identity v3).
+* `domain_name` - (Optional) The Name of the Domain to scope to (Identity v3).
   If omitted, the following environment variables are checked (in this order):
   `OS_USER_DOMAIN_NAME`, `OS_PROJECT_DOMAIN_NAME`, `OS_DOMAIN_NAME`,
   `DEFAULT_DOMAIN`.
@@ -209,7 +211,7 @@ The following arguments are supported:
   Swift-native authentication system. If omitted, the `OS_SWAUTH` environment
   variable is used. You must also set `username` to the Swauth/Swift username
   such as `username:project`. Set the `password` to the Swauth/Swift key.
-  Finally, set `auth_url` as the location of the Swift service. 
+  Finally, set `auth_url` as the location of the Swift service.
 -> **Note:** This will only work when used with the OpenTelekomCloud Object Storage resources.
 
 * `agency_name` - (Optional) if authorized by assume role, it must be set. The

opentelekomcloud/provider.go

@@ -39,7 +39,10 @@ func Provider() terraform.ResourceProvider {
 				Type:        schema.TypeString,
 				Optional:    true,
 				Description: descriptions["region"],
-				DefaultFunc: schema.EnvDefaultFunc("OS_REGION_NAME", ""),
+				DefaultFunc: schema.MultiEnvDefaultFunc([]string{
+					"OS_REGION_NAME",
+					"OS_REGION",
+				}, ""),
 			},
 
 			"user_name": {

opentelekomcloud/provider_test.go

@@ -50,12 +50,9 @@ func init() {
 	testAccProviders = map[string]terraform.ResourceProvider{
 		"opentelekomcloud": testAccProvider,
 	}
-	tn := os.Getenv("OS_TENANT_NAME")
-	if tn == "" {
-		tn = os.Getenv("OS_PROJECT_NAME")
-	}
-	OS_REGION_NAME = GetRegion(nil, &Config{TenantName: tn})
 
+	testAccProvider.Configure(terraform.NewResourceConfigRaw(nil))
+	OS_REGION_NAME = GetRegion(nil, testAccProvider.Meta().(*Config))
 }
 
 func getTenantName() ProjectName {

opentelekomcloud/resource_opentelekomcloud_compute_instance_v2.go

@@ -1299,7 +1299,7 @@ func securityGroupsByIDs(diff *schema.ResourceDiff, meta interface{}) error {
 
 	// resolve IDs
 	config := meta.(*Config)
-	computeClient, err := config.computeV2HWClient(GetRegion(nil, config))
+	computeClient, err := config.computeV2HWClient(GetRegion(diff, config))
 	if err != nil {
 		return fmt.Errorf("error creating OpenTelekomCloud compute client: %s", err)
 	}

opentelekomcloud/util.go

@@ -38,24 +38,34 @@ func CheckDeleted(d *schema.ResourceData, err error, msg string) error {
 	return fmt.Errorf("%s: %s", msg, err)
 }
 
+type schemaOrDiff interface {
+	GetOk(key string) (interface{}, bool)
+}
+
 // GetRegion returns the region that was specified in the resource. If a
 // region was not set, the provider-level region is checked. The provider-level
 // region can either be set by the region argument or by OS_REGION_NAME.
-func GetRegion(_ *schema.ResourceData, config *Config) string {
-	n := config.TenantName
-	if n == "" {
-		n = config.DelegatedProject
+func GetRegion(d schemaOrDiff, config *Config) string {
+	if d != nil {
+		if v, ok := d.GetOk("region"); ok {
+			return v.(string)
+		}
 	}
-	return strings.Split(n, "_")[0]
+	if v := config.Region; v != "" {
+		return v
+	}
+	tenantName := string(GetProjectName(d, config))
+	return strings.Split(tenantName, "_")[0]
 }
 
 type ProjectName string
 
 // GetProjectName returns the project name that was specified in the resource.
-func GetProjectName(d *schema.ResourceData, config *Config) ProjectName {
-	projectName := d.Get("project_name").(string)
-	if projectName != "" {
-		return ProjectName(projectName)
+func GetProjectName(d schemaOrDiff, config *Config) ProjectName {
+	if d != nil {
+		if v, ok := d.GetOk("project_name"); ok {
+			return ProjectName(v.(string))
+		}
 	}
 	tenantName := config.TenantName
 	if tenantName == "" {