[pbs-devel] applied-series: [PATCH proxmox-backup 1/2] backup/snapshot reader: improve error message for ENOENT

[Wolfgang Bumiller <w.bumiller@proxmox.com>]

While I really do not like `.exists()` on a path that is used right
afterwards and our "helpers" there need to switch to `io::Error` instead
of useless `anyhow::Error` strings...
expecting our locking to change and the paths don't matching up
afterwards this series should be fine this way, too.

applied, thanks

On Thu, Feb 02, 2023 at 02:04:23PM +0100, Fabian Grünbichler wrote:
> instead of
> 
>  Error: unable to open snapshot directory "/full/path/to/snapshot" for locking - ENOENT: No such file or directory
> 
> this will now print
> 
>  Error: Snapshot vm/800/2023-01-16T12:28:11Z does not exist.
> 
> Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
> ---
> 
> Notes:
>     we could also include the datastore/namespace, although we are not that
>     consistent in general in that regard, and the caller should technically
>     know since they provided it ;).
> 
>  pbs-datastore/src/snapshot_reader.rs | 4 ++++
>  src/api2/reader/mod.rs               | 4 ++++
>  2 files changed, 8 insertions(+)
> 
> diff --git a/pbs-datastore/src/snapshot_reader.rs b/pbs-datastore/src/snapshot_reader.rs
> index 899c3bce..ec7a48e5 100644
> --- a/pbs-datastore/src/snapshot_reader.rs
> +++ b/pbs-datastore/src/snapshot_reader.rs
> @@ -41,6 +41,10 @@ impl SnapshotReader {
>          let datastore = snapshot.datastore();
>          let snapshot_path = snapshot.full_path();
>  
> +        if !snapshot_path.exists() {
> +            bail!("snapshot {} does not exist!", snapshot.dir());
> +        }
> +
>          let locked_dir =
>              lock_dir_noblock_shared(&snapshot_path, "snapshot", "locked by another operation")?;
>  
> diff --git a/src/api2/reader/mod.rs b/src/api2/reader/mod.rs
> index e2a10da3..1ac4ac40 100644
> --- a/src/api2/reader/mod.rs
> +++ b/src/api2/reader/mod.rs
> @@ -125,6 +125,10 @@ fn upgrade_to_backup_reader_protocol(
>              }
>          }
>  
> +        if !backup_dir.full_path().exists() {
> +            bail!("snapshot {} does not exist.", backup_dir.dir());
> +        }
> +
>          let _guard = lock_dir_noblock_shared(
>              &backup_dir.full_path(),
>              "snapshot",
> -- 
> 2.30.2