> In RBDPlugin.pm i found this part and i was wondering how it works.
>
> my $parser = sub {
> my $line = shift;
>
> if ($line =~
> m/^((vm|base)-(\d+)-disk-\d+)\s+(\d+)(M|G|T)\s((\S+)\/((vm|base)-\d+-
> \S+@\S+))?/)
> {
> my ($image, $owner, $size, $unit, $parent) = ($1, $3, $4, $5,
> $8);
>
> $list->{$pool}->{$image} = {
> name => $image,
> size => $size*rbd_unittobytes()->{$unit},
> parent => $parent,
> vmid => $owner
> };
> }
> };
>
> eval {
> run_command($cmd, errmsg => "rbd error", errfunc => sub { }, outfunc
> => $parser);
> };
> my $err = $@;
>
> ====> under which circumstances does run_command die? errorcode != 0?
>
> die $err if $err && $err !~ m/doesn't contain rbd images/ ;
>
> Where does this content $@ comes from? errfunc does nothing...
The important thing here is:
Parameter: errmsg => "rbd error"
This records the last string from 'stderr', and use that string for the
exception if errorcode != 0.
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