[pbs-devel] [PATCH proxmox-backup] api: enhance directory existence check

[Markus Frank <m.frank@proxmox.com>]

Instead of just checking the existence of the path, the code now also checks
whether the directory is empty, continues if it is, and aborts if it is not.

Previously, if a directory were deleted and a directory with the same name
would be created, the old check prevented the creation even though the
directory could be used as a mount point.

Signed-off-by: Markus Frank <m.frank@proxmox.com>
---
 src/api2/node/disks/directory.rs | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/api2/node/disks/directory.rs b/src/api2/node/disks/directory.rs
index 5e1cb124..cd7b44a3 100644
--- a/src/api2/node/disks/directory.rs
+++ b/src/api2/node/disks/directory.rs
@@ -155,13 +155,17 @@ pub fn create_datastore_disk(
 
     let mount_point = format!("{}{}", BASE_MOUNT_DIR, &name);
 
-    // check if the default path does exist already and bail if it does
+    // check if the default path does exist already
+    // and bail if it does and is not empty
     let default_path = std::path::PathBuf::from(&mount_point);
 
     match std::fs::metadata(&default_path) {
         Err(_) => {} // path does not exist
         Ok(_) => {
-            bail!("path {:?} already exists", default_path);
+            let is_empty = default_path.read_dir()?.next().is_none();
+            if !is_empty {
+                bail!("path {:?} already exists and is not empty", default_path);
+            }
         }
     }
 
-- 
2.39.2