initialize an empty array in disco_block_devices
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@ -6,6 +6,7 @@ opendir(my $dh, "/sys/block") or die "Couldn't open /sys/block: $!";
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my @blocks = grep { $_ !~ m/^\./ } readdir($dh);
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closedir($dh);
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my $json;
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@{$json->{data}} = ();
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foreach my $block (@blocks){
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my $removable = 0;
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my $size = 1;
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