[pbs-devel] [PATCH proxmox-backup 1/2] backup/snapshot reader: improve error message for ENOENT

["Fabian Grünbichler" <f.gruenbichler@proxmox.com>]

instead of

 Error: unable to open snapshot directory "/full/path/to/snapshot" for locking - ENOENT: No such file or directory

this will now print

 Error: Snapshot vm/800/2023-01-16T12:28:11Z does not exist.

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
---

Notes:
    we could also include the datastore/namespace, although we are not that
    consistent in general in that regard, and the caller should technically
    know since they provided it ;).

 pbs-datastore/src/snapshot_reader.rs | 4 ++++
 src/api2/reader/mod.rs               | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/pbs-datastore/src/snapshot_reader.rs b/pbs-datastore/src/snapshot_reader.rs
index 899c3bce..ec7a48e5 100644
--- a/pbs-datastore/src/snapshot_reader.rs
+++ b/pbs-datastore/src/snapshot_reader.rs
@@ -41,6 +41,10 @@ impl SnapshotReader {
         let datastore = snapshot.datastore();
         let snapshot_path = snapshot.full_path();
 
+        if !snapshot_path.exists() {
+            bail!("snapshot {} does not exist!", snapshot.dir());
+        }
+
         let locked_dir =
             lock_dir_noblock_shared(&snapshot_path, "snapshot", "locked by another operation")?;
 
diff --git a/src/api2/reader/mod.rs b/src/api2/reader/mod.rs
index e2a10da3..1ac4ac40 100644
--- a/src/api2/reader/mod.rs
+++ b/src/api2/reader/mod.rs
@@ -125,6 +125,10 @@ fn upgrade_to_backup_reader_protocol(
             }
         }
 
+        if !backup_dir.full_path().exists() {
+            bail!("snapshot {} does not exist.", backup_dir.dir());
+        }
+
         let _guard = lock_dir_noblock_shared(
             &backup_dir.full_path(),
             "snapshot",
-- 
2.30.2