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nixpkgs/nixos/modules/hardware/video/uvcvideo/uvcdynctrl-udev-rules.nix

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Nix

{ buildEnv
, libwebcam
, makeWrapper
, runCommand
, drivers ? []
, udevDebug ? false
}:
let
version = "0.0.0";
dataPath = buildEnv {
name = "uvcdynctrl-with-drivers-data-path";
paths = drivers ++ [ libwebcam ];
pathsToLink = [ "/share/uvcdynctrl/data" ];
ignoreCollisions = false;
};
dataDir = "${dataPath}/share/uvcdynctrl/data";
udevDebugVarValue = if udevDebug then "1" else "0";
in
runCommand "uvcdynctrl-udev-rules-${version}"
{
inherit dataPath;
buildInputs = [
makeWrapper
libwebcam
];
dontPatchELF = true;
dontStrip = true;
preferLocalBuild = true;
}
''
mkdir -p "$out/lib/udev"
makeWrapper "${libwebcam}/lib/udev/uvcdynctrl" "$out/lib/udev/uvcdynctrl" \
--set NIX_UVCDYNCTRL_DATA_DIR "${dataDir}" \
--set NIX_UVCDYNCTRL_UDEV_DEBUG "${udevDebugVarValue}"
mkdir -p "$out/lib/udev/rules.d"
cat "${libwebcam}/lib/udev/rules.d/80-uvcdynctrl.rules" | \
sed -r "s#RUN\+\=\"([^\"]+)\"#RUN\+\=\"$out/lib/udev/uvcdynctrl\"#g" > \
"$out/lib/udev/rules.d/80-uvcdynctrl.rules"
''