feat(upgrade): fail when upgrading from a higher to a lower version

Signed-off-by: Niladri Halder <[email protected]>

k8s/upgrade/src/plugin/preflight_validations.rs

@@ -233,7 +233,7 @@ pub(crate) async fn upgrade_path_validation(
     // Stable to unstable check.
     if !allow_unstable {
         let mut self_is_stable: bool = false;
-        if let Some(version) = self_version {
+        if let Some(ref version) = self_version {
             if !version.pre.is_empty() {
                 self_is_stable = true;
             }
@@ -244,6 +244,14 @@ pub(crate) async fn upgrade_path_validation(
         }
     }
 
+    // Upgrade not allowed to lower semver versions check.
+    if let Some(ref version) = self_version {
+        if version.lt(&source) {
+            console_logger::error("", user_prompt::HIGHER_TO_LOWER_SEMVER_UPGRADE);
+            return error::InvalidUpgradePath.fail();
+        }
+    }
+
     Ok(())
 }
 

k8s/upgrade/src/plugin/user_prompt.rs

@@ -59,3 +59,8 @@ pub const HELM_UPGRADE_VALIDATION_ERROR: &str =
 pub const STABLE_TO_UNSTABLE_UPGRADE: &str =
     "Cannot upgrade from a stable version to an unstable version. \
 If this is intentional, try again with '--allow-unstable'";
+
+/// Failure notice for when upgrading from a higher version to a lower one.
+pub const HIGHER_TO_LOWER_SEMVER_UPGRADE: &str =
+    "Cannot upgrade from a higher version to a lower version. \
+If this is intentional, try again with '--skip-upgrade-path-validation-for-unsupported-version'";