various things because i am lazy

modules/hardware/scan_and_print.nix

@@ -0,0 +1,27 @@
+{pkgs, ...}: {
+  hardware.sane.enable = true; # enables support for SANE scanners
+  services.ipp-usb.enable = true; # enable usb support
+
+  hardware.sane.backends-package = pkgs.sane-backends.overrideAttrs (old: {
+    configureFlags =
+      (old.configureFlags or [])
+      ++ [
+        # "--localstatedir=/var" # `sane-backends` puts e.g. lock files in here, must not be in /nix/store
+        # "--with-lockdir=/var/lock/sane" # `sane-backends` puts e.g. lock files in here, must not be in /nix/store
+
+        # Ugly workaround for https://github.com/NixOS/nixpkgs/issues/273280#issuecomment-1848873028
+        # Really we should make `sane-backends` be able to provide a real lock dir (e.g. `/var/lock/sane`).
+        "--disable-locking"
+      ];
+  });
+
+  users.users.ranomier.extraGroups = ["scanner" "lp"];
+
+  # only for the scan and maybe print clients
+  environment.systemPackages = with pkgs; [
+    simple-scan
+  ];
+
+  # Enable CUPS to print documents.
+  services.printing.enable = true;
+}