[pve-devel] [PATCH storage 1/2] disks: get: separate error path for retrieving SMART data

[Max Carrara]

On Fri Apr 11, 2025 at 5:08 PM CEST, Daniel Kral wrote:
> Make the subroutine get_smart_data() die with the error message from
> running the `smartctl` command before. This is in preparation for the
> next patch, which makes that command fail in certain scenarios.
>
> Signed-off-by: Daniel Kral <d.kral at proxmox.com>
> ---
>  src/PVE/Diskmanage.pm | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/src/PVE/Diskmanage.pm b/src/PVE/Diskmanage.pm
> index 4272668..059d645 100644
> --- a/src/PVE/Diskmanage.pm
> +++ b/src/PVE/Diskmanage.pm
> @@ -150,8 +150,10 @@ sub get_smart_data {
>      };
>      my $err = $@;
>  
> +    die "Error getting S.M.A.R.T. data: $err\n" if $err;

The above is *fine* IMO, but for future reference, I'd recommend
something like this if $@ is only used in one place:

    die "Error getting S.M.A.R.T. data: $@\n" if $@;

Also, another convenient pattern I've seen (and also been using lately)
is the following---useful if you need to do a bit more than just die:

    if (my $err = $@) {
        # [...]
    }

> +
>      # bit 0 and 1 mark a fatal error, other bits are for disk status -> ignore (see man 8 smartctl)
> -    if ((defined($returncode) && ($returncode & 0b00000011)) || $err) {
> +    if ((defined($returncode) && ($returncode & 0b00000011))) {

The inner parentheses here are redundant, now that `|| $err` is gone ;)
But can IMO just be adapted in a tiny follow-up / when applying.

>  	die "Error getting S.M.A.R.T. data: Exit code: $returncode\n";
>      }
>