Add scanner setup

flake.nix

@@ -132,7 +132,7 @@
             fend = inputs.fend.packages."${system}".fend;
           })
           # Some program adjustments
-          #(import ./overlays/mosh.nix)
+          (import ./overlays/sane-backends.nix)
           (import ./overlays/logisim.nix)
           (import ./overlays/cataclysm-dda.nix)
         ];
@@ -144,6 +144,7 @@
         modules = [
           ./system/helix-texta.nix
           ./system/light-actkbd.nix
+          ./system/modules/scanner.nix
           self.nixosModules.helix-texta-hardware
           home-manager.nixosModules.home-manager
           self.nixosModules.home-manager

overlays/sane-backends.nix

@@ -0,0 +1,17 @@
+self: super:
+
+{
+  sane-backends = (super.sane-backends.override {
+    extraFirmware = [{
+      src = super.fetchurl {
+        url = "www.meier-geinitz.de/sane/gt68xx-backend/firmware/sbfw.usb";
+        sha256 = "12hnacivpy153alfjyr7k92y90nmb5d7z1ca7aix5w7wi0w4jdjv";
+      };
+      name = "sbfw.usb";
+      backend = "gt68xx";
+    }];
+  }).overrideAttrs (old: {
+    patches = (old.patches or [ ]) ++ [ ../patches/gt68xx.conf.patch ];
+    prePatch = "stat backend/gt68xx.conf.in";
+  });
+}

patches/gt68xx.conf.patch

@@ -0,0 +1,15 @@
+--- a/backend/gt68xx.conf.in	2021-02-14 12:25:19.000000000 +0100
++++ b/backend/gt68xx.conf.in	2021-11-05 14:43:41.077378018 +0100
+@@ -30,9 +30,9 @@
+ #override "mustek-scanexpress-1200-ub-plus"
+ 
+ # Medion/Lifetec/Tevion LT 9452:
+-#override "mustek-scanexpress-1200-ub-plus"
+-#vendor "Lifetec"
+-#model "LT 9452"
++override "mustek-scanexpress-1200-ub-plus"
++vendor "Lifetec"
++model "LT 9452"
+ 
+ # Trust Compact Scan USB 19200:
+ #override "mustek-scanexpress-1200-ub-plus"

system/helix-texta.nix

@@ -123,8 +123,16 @@ in {
       hashedPassword =
         "$6$zqEC2iJJ98Ne$lRERO30msyjJm7oJCqRD/xj3NIm4De37gD.VUzfg7aceosE/6S6eNAaruIakgUtSC970MHRPoNlCEy1RoFuyh.";
       isNormalUser = true;
-      extraGroups =
-        [ "wheel" "networkmanager" "video" "lp" "kvm" "libvirtd" "podman" ];
+      extraGroups = [
+        "wheel"
+        "networkmanager"
+        "video"
+        "lp"
+        "kvm"
+        "libvirtd"
+        "podman"
+        "scanner"
+      ];
       # Yes, use the best, please
       shell = pkgs.fish;
     };

system/modules/scanner.nix

@@ -0,0 +1,27 @@
+{ pkgs, ... }:
+
+let
+  scan = "${pkgs.sane-backends}/bin/scanimage";
+  convert = "${pkgs.imagemagick}/bin/convert";
+  # TODO: Can I specify this in a better way?
+  device = "gt68xx";
+
+  scan-a4 = pkgs.writeScriptBin "scan-a4" ''
+    #!${pkgs.stdenv.shell}
+    if [[ -z $1 ]]; then
+      echo "Missing filename"
+      exit 1
+    fi
+
+    ${scan} --device-name ${device} \
+             -x 210 \
+             -y 297 \
+             -o /tmp/last-scan.png \
+            --resolution 150 || exit 2
+    ${convert} /tmp/last-scan.png $1 || exit 3
+  '';
+in {
+  hardware.sane.enable = true;
+
+  environment.systemPackages = [ scan-a4 ];
+}