nixpkgs/pkgs/os-specific/linux/device-tree/default.nix

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{ stdenvNoCC, dtc, findutils }:
with stdenvNoCC.lib; {
applyOverlays = (base: overlays': stdenvNoCC.mkDerivation {
name = "device-tree-overlays";
nativeBuildInputs = [ dtc findutils ];
buildCommand = let
overlays = toList overlays';
in ''
mkdir -p $out
cd ${base}
find . -type f -name '*.dtb' -print0 \
| xargs -0 cp -v --no-preserve=mode --target-directory $out --parents
for dtb in $(find $out -type f -name '*.dtb'); do
dtbCompat="$( fdtget -t s $dtb / compatible )"
${flip (concatMapStringsSep "\n") overlays (o: ''
overlayCompat="$( fdtget -t s ${o.dtboFile} / compatible )"
# overlayCompat in dtbCompat
if [[ "$dtbCompat" =~ "$overlayCompat" ]]; then
echo "Applying overlay ${o.name} to $( basename $dtb )"
mv $dtb{,.in}
fdtoverlay -o "$dtb" -i "$dtb.in" ${o.dtboFile};
rm $dtb.in
fi
'')}
done
'';
});
}