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{ runCommand, lib }:
firmware:
let
args = lib.optionalAttrs (firmware ? meta) { inherit (firmware) meta; };
in
runCommand "${firmware.name}-xz" args ''
mkdir -p $out/lib
(cd ${firmware} && find lib/firmware -type d -print0) |
(cd $out && xargs -0 mkdir -v --)
(cd ${firmware} && find lib/firmware -type f -print0) |
(cd $out && xargs -0rtP "$NIX_BUILD_CORES" -n1 \
sh -c 'xz -9c -T1 -C crc32 --lzma2=dict=2MiB "${firmware}/$1" > "$1.xz"' --)
(cd ${firmware} && find lib/firmware -type l) | while read link; do
target="$(readlink "${firmware}/$link")"
ln -vs -- "''${target/^${firmware}/$out}.xz" "$out/$link.xz"
done
''
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