1 files changed, 39 insertions, 0 deletions
diff --git a/config/initializers/0_inject_feature_flags.rb b/config/initializers/0_inject_feature_flags.rb
index 5b33b3bb4ea..74470a6cbfc 100644
--- a/config/initializers/0_inject_feature_flags.rb
+++ b/config/initializers/0_inject_feature_flags.rb
@@ -4,3 +4,42 @@
 Feature.register_feature_groups
 Feature.register_definitions
 Feature.register_hot_reloader unless Rails.configuration.cache_classes
+
+# This disallows usage of licensed feature names with the same name
+# as feature flags. This naming collision creates confusion and it was
+# decided to be removed in favor of explicit check.
+# https://gitlab.com/gitlab-org/gitlab/-/issues/259611
+if Gitlab.ee? && Gitlab.dev_or_test_env?
+  # These are the names of feature flags that do violate the constraint of
+  # being unique to licensed names. These feature flags should be reworked to
+  # be "development" with explicit check
+  IGNORED_FEATURE_FLAGS = %i[
+    swimlanes
+  ].to_set
+
+  # First, we validate a list of overrides to ensure that these overrides
+  # are removed if feature flag is gone
+  missing_feature_flags = IGNORED_FEATURE_FLAGS.reject do |feature_flag|
+    Feature::Definition.definitions[feature_flag]
+  end
+
+  if missing_feature_flags.any?
+    raise "The following feature flags were added as an override for discovering licensed features. " \
+          "Since these feature flags seems to be gone, ensure to remove them from \`IGNORED_FEATURE_FLAGS\` " \
+          "in \`#{__FILE__}'`: #{missing_feature_flags.join(", ")}"
+  end
+
+  # Second, we validate that there's no feature flag under the name as licensed feature
+  # flag, to ensure that the name used, is unique
+  licensed_features = License::PLANS_BY_FEATURE.keys.select do |licensed_feature_name|
+    IGNORED_FEATURE_FLAGS.exclude?(licensed_feature_name) &&
+      Feature::Definition.definitions[licensed_feature_name]
+  end
+
+  if licensed_features.any?
+    raise "The following feature flags do use a licensed feature. " \
+          "To avoid the confusion between their usage it is disallowed to use feature flag " \
+          "with exact the same name as licensed feature name. Use a different name to create " \
+          "a distinction: #{licensed_features.join(", ")}"
+  end
+end