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nixpkgs/pkgs/applications/graphics/sane/config.nix

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Nix

{ stdenv }:
{ paths }:
with stdenv.lib;
let installSanePath = path: ''
if test -e "${path}/lib/sane"; then
find "${path}/lib/sane" -maxdepth 1 -not -type d | while read backend; do
ln -s $backend $out/lib/sane/$(basename $backend)
done
fi
if test -e "${path}/etc/sane.d"; then
find "${path}/etc/sane.d" -maxdepth 1 -not -type d | while read conf; do
if test $(basename $conf) = "dll.conf"; then
cat $conf >> $out/etc/sane.d/dll.conf
else
ln -s $conf $out/etc/sane.d/$(basename $conf)
fi
done
fi
if test -e "${path}/etc/sane.d/dll.d"; then
find "${path}/etc/sane.d/dll.d" -maxdepth 1 -not -type d | while read conf; do
ln -s $conf $out/etc/sane.d/dll.d/$(basename $conf)
done
fi
'';
in
stdenv.mkDerivation {
name = "sane-config";
phases = "installPhase";
installPhase = ''
mkdir -p $out/etc/sane.d $out/etc/sane.d/dll.d $out/lib/sane
'' + concatMapStrings installSanePath paths;
}