Revert "Remove missleading function"

This reverts commit 08759f1.

Author: sbernauer

crates/stackable-operator/src/role_utils.rs

@@ -100,8 +100,15 @@ use kube::{runtime::reflector::ObjectRef, Resource};
 use regex::Regex;
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
+use snafu::{OptionExt, Snafu};
 use tracing::instrument;
 
+#[derive(Debug, Snafu)]
+pub enum Error {
+    #[snafu(display("missing roleGroup {role_group:?}"))]
+    MissingRoleGroup { role_group: String },
+}
+
 #[derive(Clone, Debug, Default, Deserialize, JsonSchema, PartialEq, Serialize)]
 #[serde(
     rename_all = "camelCase",
@@ -358,6 +365,30 @@ where
                 .collect(),
         }
     }
+
+    /// Returns the product specific common config from
+    /// 1. The role
+    /// 2. The role group
+    pub fn merged_product_specific_common_configs<'a>(
+        &'a self,
+        role_group: &str,
+    ) -> Result<
+        (
+            &'a ProductSpecificCommonConfig,
+            &'a ProductSpecificCommonConfig,
+        ),
+        Error,
+    > {
+        let from_role = &self.config.product_specific_common_config;
+        let from_role_group = &self
+            .role_groups
+            .get(role_group)
+            .with_context(|| MissingRoleGroupSnafu { role_group })?
+            .config
+            .product_specific_common_config;
+
+        Ok((from_role, from_role_group))
+    }
 }
 
 /// This is a product-agnostic RoleConfig, which is sufficient for most of the products.
@@ -489,6 +520,10 @@ mod tests {
         )
         .unwrap();
 
+        // let mut merged = role_group;
+        // merged.merge(&role);
+        // merged.merge(&operator_generated);
+
         // Please note that merge order is different than we normally do!
         // This is not trivial, as the merge operation is not purely additive (as it is with e.g.
         // PodTemplateSpec).