Re: [pbs-devel] [PATCH proxmox-backup 3/3] restore daemon: search disk also with truncated serial

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

On May 15, 2024 11:55 am, Dominik Csapak wrote:
> the disk serial given to virtio disks only can be 20 characters, so
> looking for a disk with a longer serial will always fail (like
> 'drive-tpmstate0-backup'). If the serial is longer, also try with the
> truncated one. Leave the first try in place in case the limit changes.

as we discussed briefly off-list, I think it might also be a good idea
to have a way to filter out images that we know are non-restorable.
since this lives in PBS here, it would probably make most sense to pass
this in somehow as an optional parameter?

the filter would then need to be respected both when constructing the
qemu commandline (we already skip archives not ending in '.img.fidx')
and when listing the archives.

then we could by default skip the efidisk and tpmstate, and any other
such special volumes/archives that might end up being needed in the
future..

> 
> Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
> ---
>  .../src/proxmox_restore_daemon/disk.rs        | 19 ++++++++++++++-----
>  1 file changed, 14 insertions(+), 5 deletions(-)
> 
> diff --git a/proxmox-restore-daemon/src/proxmox_restore_daemon/disk.rs b/proxmox-restore-daemon/src/proxmox_restore_daemon/disk.rs
> index db96ced0b..4991479c2 100644
> --- a/proxmox-restore-daemon/src/proxmox_restore_daemon/disk.rs
> +++ b/proxmox-restore-daemon/src/proxmox_restore_daemon/disk.rs
> @@ -634,12 +634,21 @@ impl DiskState {
>              _ => bail!("no or invalid image in path"),
>          };
>  
> -        let buckets = match self.disk_map.get_mut(
> -            req_fidx
> -                .strip_suffix(".img.fidx")
> -                .unwrap_or_else(|| req_fidx.as_ref()),
> -        ) {
> +        let serial = req_fidx
> +            .strip_suffix(".img.fidx")
> +            .unwrap_or_else(|| req_fidx.as_ref());
> +        let buckets = match self.disk_map.get_mut(serial) {
>              Some(x) => x,
> +            None if serial.len() > 20 => {
> +                let (truncated_serial, _) = serial.split_at(20);
> +                eprintln!(
> +                    "given image '{req_fidx}' not found with '{serial}', trying with '{truncated_serial}'."
> +                );
> +                match self.disk_map.get_mut(truncated_serial) {
> +                    Some(x) => x,
> +                    None => bail!("given image '{req_fidx}' not found with '{truncated_serial}'"),
> +                }
> +            }

as an alternative to this here, we could also use a (truncated) hash as
the serial, and than map that back to the "readable" name. might make
logging awkward though, unless we pro-actively hand the map to the
restore daemon. and it might only really be relevant for custom usage of
all of this, if we implement the filtering above ;)

>              None => bail!("given image '{req_fidx}' not found"),
>          };
>  
> -- 
> 2.39.2
> 
> 
> 
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> 
> 
> 


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