[pbs-devel] [PATCH proxmox-backup v2] fix #3921: client: confusing backup reader error

[Gabriel Goller <g.goller@proxmox.com>]

When using the catalog shell command, a common error is that user pass
"./files.pxar" instead of "files.pxar". This will result in a cryptic error
"... value does not match regex pattern ...". Added some context to the
error according to suggestions here [1].

[1]: https://bugzilla.proxmox.com/show_bug.cgi?id=3921

Signed-off-by: Gabriel Goller <g.goller@proxmox.com>
---

Changes since v1:
 - inlined variables in `format_err!` call

 pbs-client/src/backup_reader.rs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pbs-client/src/backup_reader.rs b/pbs-client/src/backup_reader.rs
index 36d8ebcf..526b5bc6 100644
--- a/pbs-client/src/backup_reader.rs
+++ b/pbs-client/src/backup_reader.rs
@@ -98,7 +98,10 @@ impl BackupReader {
     pub async fn download<W: Write + Send>(&self, file_name: &str, output: W) -> Result<(), Error> {
         let path = "download";
         let param = json!({ "file-name": file_name });
-        self.h2.download(path, Some(param), output).await
+        self.h2
+            .download(path, Some(param), output)
+            .await
+            .map_err(|err| format_err!("http2 file download '{file_name}' failed: \n{err}"))
     }
 
     /// Execute a special GET request and send output to a writer
-- 
2.39.2