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My NixOS systems configurations.
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sane-extra-config.nixos.nix (1120B)

      1 { config, lib, pkgs, ... }:
      2 
      3 with lib;
      4 let
      5   cfg = config.hardware.sane;
      6   pkg =
      7     if cfg.snapshot
      8     then pkgs.sane-backends-git
      9     else pkgs.sane-backends;
     10   backends = [ pkg ] ++ cfg.extraBackends;
     11   saneConfig = pkgs.mkSaneConfig { paths = backends; };
     12   # saneExtraConfig =
     13   #   pkgs.runCommand "sane-extra-config"
     14   #     { } ''
     15   #     cp -Lr '${pkgs.mkSaneConfig { paths = [ pkgs.sane-backends ]; }}'/etc/sane.d $out
     16   #     chmod +w $out
     17   #     ${concatMapStrings
     18   #       (
     19   #       c: ''
     20   #         f="$out/${c.name}.conf"
     21   #         [ ! -e "$f" ] || chmod +w "$f"
     22   #         cat ${builtins.toFile "" (c.value + "\n")} >>"$f"
     23   #         chmod -w "$f"
     24   #       ''
     25   #       )
     26   #       (mapAttrsToList nameValuePair cfg.extraConfig)}
     27   #     chmod -w $out
     28   #   '';
     29 in
     30 {
     31   options = {
     32     hardware.sane.extraConfig = mkOption {
     33       type = types.attrsOf types.lines;
     34       default = { };
     35       example = { "some-backend" = "# some lines to add to its .conf"; };
     36     };
     37   };
     38 
     39   config = mkIf (cfg.enable && cfg.extraConfig != { }) {
     40     # hardware.sane.configDir = saneExtraConfig.outPath;
     41   };
     42 }