[pbs-devel] [PATCH proxmox-backup 3/5] api: tape: don't allow duplicate media label-texts

[Dominik Csapak <d.csapak@proxmox.com>]

quite a few parts of our code assumes that the label-text is unique in
the inventory, which leads to rather unexpected behaviour when having
more than one tape with the same label-text, e.g. a
`proxmox-tape media destroy <LABEL>`
destroys the first one in the config
(same with moving to vault, etc.)

since having multiple tapes with the same human readable name is always
confusing, simply disallow that here

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
---
 src/api2/tape/drive.rs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/api2/tape/drive.rs b/src/api2/tape/drive.rs
index 54d15db8..19c8e78a 100644
--- a/src/api2/tape/drive.rs
+++ b/src/api2/tape/drive.rs
@@ -539,6 +539,14 @@ fn write_media_label(
     label: MediaLabel,
     pool: Option<String>,
 ) -> Result<(), Error> {
+    let mut inventory = Inventory::new(TAPE_STATUS_DIR);
+    inventory.reload()?;
+    if inventory
+        .find_media_by_label_text(&label.label_text)?
+        .is_some()
+    {
+        bail!("Media with label '{}' already exists", label.label_text);
+    }
     drive.label_tape(&label)?;
     if let Some(ref pool) = pool {
         task_log!(
@@ -562,8 +570,6 @@ fn write_media_label(
 
     // Create the media catalog
     MediaCatalog::overwrite(TAPE_STATUS_DIR, &media_id, false)?;
-
-    let mut inventory = Inventory::new(TAPE_STATUS_DIR);
     inventory.store(media_id.clone(), false)?;
 
     drive.rewind()?;
-- 
2.30.2