Import ruler namespace ressource using namespace name instead of id

We can't query a ruler namespace using id

Author: vaxvms

docs/resources/ruler_namespace.md

@@ -46,4 +46,10 @@ EOT
 
 - `id` (String) The ID of this resource.
 
+## Import
 
+Resource can be imported using the namespace name, e.g.
+
+```
+$ terraform import mimirtool_ruler_namespace.demo demo
+```

mimirtool/resource_ruler_namespace.go

@@ -25,7 +25,7 @@ func resourceRulerNamespace() *schema.Resource {
 		UpdateContext: rulerNamespaceUpdate,
 		DeleteContext: rulerNamespaceDelete,
 		Importer: &schema.ResourceImporter{
-			StateContext: schema.ImportStatePassthroughContext,
+			StateContext: rulerNamespaceImport,
 		},
 
 		Schema: map[string]*schema.Schema{
@@ -213,6 +213,16 @@ func rulerNamespaceDelete(ctx context.Context, d *schema.ResourceData, meta any)
 	return diags
 }
 
+func rulerNamespaceImport(ctx context.Context, d *schema.ResourceData, meta interface{}) ([]*schema.ResourceData, error) {
+	namespace := d.Id()
+	d.Set("namespace", namespace)
+	d.SetId(hash(namespace))
+
+	results := make([]*schema.ResourceData, 1)
+	results[0] = d
+	return results, nil
+}
+
 // Borrowed from https://github.com/grafana/terraform-provider-grafana/blob/master/grafana/resource_dashboard.go
 func normalizeNamespaceYAML(config any) string {
 	configYAML := config.(string)

mimirtool/resource_ruler_namespace_test.go

@@ -30,6 +30,13 @@ func TestAccResourceNamespace(t *testing.T) {
 						"mimirtool_ruler_namespace.demo", "config_yaml", testAccResourceNamespaceYamlAfterUpdate),
 				),
 			},
+			{
+				ResourceName:            "mimirtool_ruler_namespace.demo",
+				ImportStateId:           "demo",
+				ImportState:             true,
+				ImportStateVerify:       true,
+				ImportStateVerifyIgnore: []string{"recording_rule_check", "strict_recording_rule_check"},
+			},
 		},
 	})
 }