~ fix provider warning

Author: lipovmi

gcore/provider.go

@@ -30,23 +30,27 @@ func Provider() *schema.Provider {
 	return &schema.Provider{
 		Schema: map[string]*schema.Schema{
 			"user_name": {
-				Type:        schema.TypeString,
-				Optional:    true,
-				Deprecated:  fmt.Sprintf("Use %s instead", ProviderOptPermanentToken),
-				DefaultFunc: schema.EnvDefaultFunc("GCORE_USERNAME", nil),
+				Type:         schema.TypeString,
+				Optional:     true,
+				AtLeastOneOf: []string{ProviderOptPermanentToken, "user_name"},
+				RequiredWith: []string{"user_name", "password"},
+				Deprecated:   fmt.Sprintf("Use %s instead", ProviderOptPermanentToken),
+				DefaultFunc:  schema.EnvDefaultFunc("GCORE_USERNAME", nil),
 			},
 			"password": {
-				Type:        schema.TypeString,
-				Optional:    true,
-				Deprecated:  fmt.Sprintf("Use %s instead", ProviderOptPermanentToken),
-				DefaultFunc: schema.EnvDefaultFunc("GCORE_PASSWORD", nil),
+				Type:         schema.TypeString,
+				Optional:     true,
+				RequiredWith: []string{"user_name", "password"},
+				Deprecated:   fmt.Sprintf("Use %s instead", ProviderOptPermanentToken),
+				DefaultFunc:  schema.EnvDefaultFunc("GCORE_PASSWORD", nil),
 			},
 			ProviderOptPermanentToken: {
-				Type:        schema.TypeString,
-				Optional:    true,
-				Sensitive:   true,
-				Description: "A permanent [API-token](https://support.gcorelabs.com/hc/en-us/articles/360018625617-API-tokens)",
-				DefaultFunc: schema.EnvDefaultFunc("GCORE_PERMANENT_TOKEN", ""),
+				Type:         schema.TypeString,
+				Optional:     true,
+				AtLeastOneOf: []string{ProviderOptPermanentToken, "user_name"},
+				Sensitive:    true,
+				Description:  "A permanent [API-token](https://support.gcorelabs.com/hc/en-us/articles/360018625617-API-tokens)",
+				DefaultFunc:  schema.EnvDefaultFunc("GCORE_PERMANENT_TOKEN", nil),
 			},
 			ProviderOptSingleApiEndpoint: {
 				Type:        schema.TypeString,
@@ -59,9 +63,6 @@ func Provider() *schema.Provider {
 				Optional:    true,
 				Deprecated:  "It doesn't make any effect anymore",
 				Description: "Should be set to true when you are gonna to use storage resource with permanent API-token only.",
-				DefaultFunc: func() (interface{}, error) {
-					return os.Getenv("GCORE_PERMANENT_TOKEN") != "", nil
-				},
 			},
 			"gcore_platform": {
 				Type:          schema.TypeString,