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

[Daniel Kral <d.kral@proxmox.com>]

On 4/11/25 17:52, Max Carrara wrote:
> 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@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.

Thanks for pointing out both, should have taken a closer look here ;).

I've made those changes + a RFC with a possibly missing error handler 
and sent a v2: 
https://lore.proxmox.com/pve-devel/20250415071123.36921-1-d.kral@proxmox.com/T/#t



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