From e128d4e84f406a8461f7cfebd9c61606586604da Mon Sep 17 00:00:00 2001
From: Dietmar Maurer <dietmar@proxmox.com>
Date: Thu, 25 Jul 2019 12:23:33 +0200
Subject: [PATCH] src/api2/admin/datastore.rs: backup logs may not be written
 twice

---
 src/api2/admin/datastore.rs | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/api2/admin/datastore.rs b/src/api2/admin/datastore.rs
index 3333c69e..4bb834b6 100644
--- a/src/api2/admin/datastore.rs
+++ b/src/api2/admin/datastore.rs
@@ -487,13 +487,17 @@ fn upload_backup_log(
 
     let backup_dir = BackupDir::new(backup_type, backup_id, backup_time);
 
-    println!("Upload backup log to {}/{}/{}/{}/{}", store,
-             backup_type, backup_id, BackupDir::backup_time_to_string(backup_dir.backup_time()), file_name);
-
     let mut path = datastore.base_path();
     path.push(backup_dir.relative_path());
     path.push(&file_name);
 
+    if path.exists() {
+        bail!("backup already contains a log.");
+    }
+
+    println!("Upload backup log to {}/{}/{}/{}/{}", store,
+             backup_type, backup_id, BackupDir::backup_time_to_string(backup_dir.backup_time()), file_name);
+
     let resp = req_body
         .map_err(Error::from)
          .fold(Vec::new(), |mut acc, chunk| {