feat(stackablectl): check for namespace before attempting uninstall

rust/stackablectl/CHANGELOG.md

@@ -11,10 +11,12 @@ All notable changes to this project will be documented in this file.
 - Add confirmation prompt to `install` subcommand for namespace selection ([#429]).
 - Add `--assume-yes` option for running commands non-interactively ([#429]).
 - Support Helm charts sourced from OCI registries in demo/stack manifests ([#440]).
+- Abort early if `uninstall` is issued for `default` namespace ([#442]).
 
 [#429]: https://github.com/stackabletech/stackable-cockpit/pull/429
 [#438]: https://github.com/stackabletech/stackable-cockpit/pull/438
 [#440]: https://github.com/stackabletech/stackable-cockpit/pull/440
+[#442]: https://github.com/stackabletech/stackable-cockpit/pull/442
 
 ## [1.4.0] - 2026-03-18
 

rust/stackablectl/src/cmds/demo.rs

@@ -183,6 +183,11 @@ pub enum CmdError {
         demo_name: String,
     },
 
+    #[snafu(display(
+        "demo {demo_name:?} cannot be uninstalled from the {DEFAULT_NAMESPACE:?} namespace, because Kubernetes does not allow deleting it. Pass --namespace <NAMESPACE> if the demo was installed in a different namespace, or delete the demo's resources manually"
+    ))]
+    UninstallFromDefaultNamespace { demo_name: String },
+
     #[snafu(display("failed to build labels for demo resources"))]
     BuildLabels { source: LabelError },
 
@@ -525,6 +530,13 @@ async fn uninstall_cmd(
     // Init result output and progress output
     let mut output = Cli::result();
 
+    ensure!(
+        args.namespaces.namespace != DEFAULT_NAMESPACE,
+        UninstallFromDefaultNamespaceSnafu {
+            demo_name: args.demo_name.clone(),
+        }
+    );
+
     let proceed_with_uninstall = args.prompt_args.assume_yes
         || {
             tracing_indicatif::suspend_tracing_indicatif(|| -> Result<bool, CmdError> {

rust/stackablectl/src/cmds/stack.rs

@@ -178,6 +178,11 @@ pub enum CmdError {
         stack_name: String,
     },
 
+    #[snafu(display(
+        "stack {stack_name:?} cannot be uninstalled from the {DEFAULT_NAMESPACE:?} namespace, because Kubernetes does not allow deleting it. Pass --namespace <NAMESPACE> if the stack was installed in a different namespace, or delete the stack's resources manually"
+    ))]
+    UninstallFromDefaultNamespace { stack_name: String },
+
     #[snafu(display("failed to build labels for stack resources"))]
     BuildLabels { source: LabelError },
 
@@ -496,6 +501,13 @@ async fn uninstall_cmd(
 ) -> Result<String, CmdError> {
     let mut output = Cli::result();
 
+    ensure!(
+        args.namespaces.namespace != DEFAULT_NAMESPACE,
+        UninstallFromDefaultNamespaceSnafu {
+            stack_name: args.stack_name.clone(),
+        }
+    );
+
     let proceed_with_uninstall = args.prompt_args.assume_yes
         || tracing_indicatif::suspend_tracing_indicatif(|| -> Result<bool, CmdError> {
             Confirm::new()