From 37373468839e8b734d0ea9ddabb49d2196206d4f Mon Sep 17 00:00:00 2001
From: makefu <github@syntax-fehler.de>
Date: Wed, 2 Aug 2017 01:08:12 +0200
Subject: ma sane-extra: init

---
 makefu/3modules/default.nix    |  1 +
 makefu/3modules/sane-extra.nix | 45 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)
 create mode 100644 makefu/3modules/sane-extra.nix

diff --git a/makefu/3modules/default.nix b/makefu/3modules/default.nix
index 2981e0fa3..00df56bee 100644
--- a/makefu/3modules/default.nix
+++ b/makefu/3modules/default.nix
@@ -9,6 +9,7 @@ _:
     ./opentracker.nix
     ./ps3netsrv.nix
     ./logging-config.nix
+    ./sane-extra.nix
     ./server-config.nix
     ./snapraid.nix
     ./torrent.nix
diff --git a/makefu/3modules/sane-extra.nix b/makefu/3modules/sane-extra.nix
new file mode 100644
index 000000000..2e0ce8f2f
--- /dev/null
+++ b/makefu/3modules/sane-extra.nix
@@ -0,0 +1,45 @@
+{ 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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