49 lines
1.8 KiB
Nix
49 lines
1.8 KiB
Nix
# modification of nixpkgs deviceTree.applyOverlays to resolve https://github.com/NixOS/nixpkgs/issues/125354
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# derived from https://github.com/NixOS/nixpkgs/blob/916ca8f2b0c208def051f8ea9760c534a40309db/pkgs/os-specific/linux/device-tree/default.nix
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{ lib, stdenvNoCC, dtc, libraspberrypi }:
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with lib; (base: overlays': stdenvNoCC.mkDerivation {
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name = "device-tree-overlays";
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nativeBuildInputs = [ dtc libraspberrypi ];
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buildCommand = let
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overlays = toList overlays';
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in ''
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mkdir -p $out
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cd "${base}"
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find . -type f -name '*.dtb' -print0 \
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| xargs -0 cp -v --no-preserve=mode --target-directory "$out" --parents
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for dtb in $(find "$out" -type f -name '*.dtb'); do
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dtbCompat=$(fdtget -t s "$dtb" / compatible 2>/dev/null || true)
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# skip files without `compatible` string
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test -z "$dtbCompat" && continue
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${flip (concatMapStringsSep "\n") overlays (o: ''
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overlayCompat="$(fdtget -t s "${o.dtboFile}" / compatible)"
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# skip incompatible and non-matching overlays
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if [[ ! "$dtbCompat" =~ "$overlayCompat" ]]; then
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echo "Skipping overlay ${o.name}: incompatible with $(basename "$dtb")"
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elif ${if ((o.filter or null) == null) then "false" else ''
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[[ "''${dtb//${o.filter}/}" == "$dtb" ]]
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''}
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then
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echo "Skipping overlay ${o.name}: filter does not match $(basename "$dtb")"
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else
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echo -n "Applying overlay ${o.name} to $(basename "$dtb")... "
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mv "$dtb"{,.in}
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# dtmerge requires a .dtbo ext for dtbo files, otherwise it adds it to the given file implicitly
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dtboWithExt="$TMPDIR/$(basename "${o.dtboFile}").dtbo"
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cp -r ${o.dtboFile} "$dtboWithExt"
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dtmerge "$dtb.in" "$dtb" "$dtboWithExt"
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echo "ok"
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rm "$dtb.in" "$dtboWithExt"
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fi
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'')}
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done'';
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})
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