[pbs-devel] [PATCH proxmox-backup] file-restore: add context to b64-decode error

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

to make the following cryptic error:

 proxmox-file-restore failed: Error: Invalid byte 46, offset 5.

more understandable:

 proxmox-file-restore failed: Error: Failed base64-decoding path '/root.pxar.didx' - Invalid byte 46, offset 5.

when a user passes in a non-base64 path but sets `--base64`.

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

Notes:
    this can happen via the PVE integration, which always sets the base64 flag
    except for the special value '/'.

 src/bin/proxmox-file-restore.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/bin/proxmox-file-restore.rs b/src/bin/proxmox-file-restore.rs
index 3d750152..bb8261bb 100644
--- a/src/bin/proxmox-file-restore.rs
+++ b/src/bin/proxmox-file-restore.rs
@@ -47,7 +47,8 @@ enum ExtractPath {
 
 fn parse_path(path: String, base64: bool) -> Result<ExtractPath, Error> {
     let mut bytes = if base64 {
-        base64::decode(path)?
+        base64::decode(path.clone())
+            .map_err(|err| format_err!("Failed base64-decoding path '{}' - {}", path, err))?
     } else {
         path.into_bytes()
     };
-- 
2.20.1