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{ config, lib, pkgs, ... }:
# https://github.com/michalrus/dotfiles/blob/d943be3089aa436e07cea5f22d829402936a9229/.nixos-config.symlink/modules/sane-extra-config.nix
# via https://github.com/NixOS/nixpkgs/issues/17411
# via https://unix.stackexchange.com/questions/321954/install-epson-v39-on-nixos
with lib;
let
cfg = config.hardware.sane;
pkg = if cfg.snapshot
then pkgs.sane-backends-git
else pkgs.sane-backends;
backends = [ pkg ] ++ cfg.extraBackends;
saneConfig = pkgs.mkSaneConfig { paths = backends; };
saneExtraConfig = pkgs.runCommand "sane-extra-config" {} ''
cp -Lr '${pkgs.mkSaneConfig { paths = [ pkgs.sane-backends ]; }}'/etc/sane.d $out
chmod +w $out
${concatMapStrings (c: ''
f="$out/${c.name}.conf"
[ ! -e "$f" ] || chmod +w "$f"
cat ${builtins.toFile "" (c.value + "\n")} >>"$f"
chmod -w "$f"
'') (mapAttrsToList nameValuePair cfg.extraConfig)}
chmod -w $out
'';
in
{
options = {
hardware.sane.extraConfig = mkOption {
type = types.attrsOf types.lines;
default = {};
example = { "some-backend" = "# some lines to add to its .conf"; };
};
};
config = mkIf (cfg.enable && cfg.extraConfig != {}) {
hardware.sane.configDir = saneExtraConfig.outPath;
};
}
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