[PATCH proxmox-backup] datastore: don't skip empty namespaces on s3 refresh

[Hannes Laimer <h.laimer@proxmox.com>]

Without this empty namespaces present on s3 won't be visible locally.

Signed-off-by: Hannes Laimer <h.laimer@proxmox.com>
---
 pbs-datastore/src/datastore.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/pbs-datastore/src/datastore.rs b/pbs-datastore/src/datastore.rs
index 7ad3d917..4749319a 100644
--- a/pbs-datastore/src/datastore.rs
+++ b/pbs-datastore/src/datastore.rs
@@ -2535,6 +2535,15 @@ impl DataStore {
                     format!("failed to strip store context prefix {store_prefix} for {object_key}")
                 })?;
                 if object_path.ends_with(NAMESPACE_MARKER_FILENAME) {
+                    // Ensure the marker's parent directory exists so the namespace is visible locally
+                    let ns_dir = tmp_base.join(object_path);
+                    if let Some(parent) = ns_dir.parent() {
+                        proxmox_sys::fs::create_path(
+                            parent,
+                            Some(dir_create_options),
+                            Some(dir_create_options),
+                        )?;
+                    }
                     continue;
                 }
 
-- 
2.47.3