Merge eefb45ca5a into 08ab561429

When backup completion and retention policy enforcement run concurrently,
both call updateRecoveryWindow to update the ObjectStore status. This can
cause "object has been modified" errors due to Kubernetes optimistic
concurrency control.

This change wraps the status update in retry.RetryOnConflict, matching
the pattern already used in setLastFailedBackupTime in the same file.
The retry logic fetches a fresh copy of the ObjectStore before each
update attempt, ensuring the resourceVersion is current.

Fixes #758

Signed-off-by: Gabriel Mouallem <gabriel@latitude.sh>

internal/cnpgi/instance/recovery_window.go

@@ -33,7 +33,8 @@ import (
 )
 
 // updateRecoveryWindow updates the recovery window inside the object
-// store status subresource
+// store status subresource. It uses retry logic to handle concurrent
+// updates from backup completion and retention policy enforcement.
 func updateRecoveryWindow(
 	ctx context.Context,
 	c client.Client,
@@ -41,6 +42,14 @@ func updateRecoveryWindow(
 	objectStore *barmancloudv1.ObjectStore,
 	serverName string,
 ) error {
+	objectStoreKey := client.ObjectKeyFromObject(objectStore)
+
+	return retry.RetryOnConflict(retry.DefaultBackoff, func() error {
+		var freshObjectStore barmancloudv1.ObjectStore
+		if err := c.Get(ctx, objectStoreKey, &freshObjectStore); err != nil {
+			return err
+		}
+
 		// Set the recovery window inside the barman object store object
 		convertTime := func(t *time.Time) *metav1.Time {
 			if t == nil {
@@ -49,16 +58,17 @@ func updateRecoveryWindow(
 			return ptr.To(metav1.NewTime(*t))
 		}
 
-	recoveryWindow := objectStore.Status.ServerRecoveryWindow[serverName]
+		recoveryWindow := freshObjectStore.Status.ServerRecoveryWindow[serverName]
 		recoveryWindow.FirstRecoverabilityPoint = convertTime(backupList.GetFirstRecoverabilityPoint())
 		recoveryWindow.LastSuccessfulBackupTime = convertTime(backupList.GetLastSuccessfulBackupTime())
 
-	if objectStore.Status.ServerRecoveryWindow == nil {
-		objectStore.Status.ServerRecoveryWindow = make(map[string]barmancloudv1.RecoveryWindow)
+		if freshObjectStore.Status.ServerRecoveryWindow == nil {
+			freshObjectStore.Status.ServerRecoveryWindow = make(map[string]barmancloudv1.RecoveryWindow)
 		}
-	objectStore.Status.ServerRecoveryWindow[serverName] = recoveryWindow
+		freshObjectStore.Status.ServerRecoveryWindow[serverName] = recoveryWindow
 
-	return c.Status().Update(ctx, objectStore)
+		return c.Status().Update(ctx, &freshObjectStore)
+	})
 }
 
 // setLastFailedBackupTime sets the last failed backup time in the