[pbs-devel] [PATCH proxmox-backup] client: catalog shell: avoid navigating below archive root

[Christian Ebner]

Avoid to underflow the catalogs shell position stack by navigating
below the archives root directory into the catalog root. Otherwise
the shell will panic, as the root entry is always expected to be
present.

Signed-off-by: Christian Ebner <c.ebner at proxmox.com>
---
Encountered while implementing the catalog shell for the split pxar
archive case.

Without this additional check, a `cd ..` in the pxar archive root of
the catalog shell will panic.

 pbs-client/src/catalog_shell.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pbs-client/src/catalog_shell.rs b/pbs-client/src/catalog_shell.rs
index 349bb7cbc..88045db5d 100644
--- a/pbs-client/src/catalog_shell.rs
+++ b/pbs-client/src/catalog_shell.rs
@@ -720,6 +720,12 @@ impl Shell {
                     &mut None,
                 )
                 .await?;
+
+                if new_position.len() < 1 {
+                    // Avoid moving below archive root into catalog root
+                    return Ok(());
+                }
+
                 if !new_position.last().unwrap().catalog.is_directory() {
                     bail!("not a directory");
                 }
-- 
2.39.2