# work out the correct domain/realm env values from the backup-file
my ($domain, $realm) = $self->get_backup_domain_realm($backup_file);
+ if ($domain eq '' or $realm eq '') {
+ warn("Could not determine domain or realm");
+ return undef;
+ }
# create a placeholder directory and smb.conf, as well as the env vars.
my ($env, $ctx) = $self->prepare_dc_testenv($prefix, $dc_name,