Enfouce namespace for Kubernetes to lowercase

3 files changed, 10 insertions, 2 deletions

diff --git a/app/models/project_services/kubernetes_service.rb b/app/models/project_services/kubernetes_service.rb
index dee99bbb859..8ba07173c74 100644
--- a/app/models/project_services/kubernetes_service.rb
+++ b/app/models/project_services/kubernetes_service.rb
@@ -24,6 +24,8 @@ class KubernetesService < DeploymentService
     validates :token
   end
 
+  before_validation :enforce_namespace_to_lower_case
+
   validates :namespace,
     allow_blank: true,
     length: 1..63,
@@ -207,4 +209,8 @@ class KubernetesService < DeploymentService
       max_session_time: current_application_settings.terminal_max_session_time
     }
   end
+
+  def enforce_namespace_to_lower_case
+    self.namespace = self.namespace&.downcase
+  end
 end
diff --git a/lib/gitlab/regex.rb b/lib/gitlab/regex.rb
index 1adc5ec952a..58f6245579a 100644
--- a/lib/gitlab/regex.rb
+++ b/lib/gitlab/regex.rb
@@ -53,7 +53,8 @@ module Gitlab
     end
 
     def kubernetes_namespace_regex_message
-      "can contain only letters, digits or '-', and cannot start or end with '-'"
+      "can contain only lowercase letters, digits, and '-'. " \
+      "Must start with a letter, and cannot end with '-'"
     end
 
     def environment_slug_regex
diff --git a/spec/models/project_services/kubernetes_service_spec.rb b/spec/models/project_services/kubernetes_service_spec.rb
index 55b96a0c12e..02a64d01738 100644
--- a/spec/models/project_services/kubernetes_service_spec.rb
+++ b/spec/models/project_services/kubernetes_service_spec.rb
@@ -38,7 +38,8 @@ describe KubernetesService, :use_clean_rails_memory_store_caching do
           'a' * 63 => true,
           'a' * 64 => false,
           'a.b' => false,
-          'a*b' => false
+          'a*b' => false,
+          'FOO' => true,
         }.each do |namespace, validity|
           it "validates #{namespace} as #{validity ? 'valid' : 'invalid'}" do
             subject.namespace = namespace