I should commit more frequently 🫣

modules/printing/default.nix

@@ -8,5 +8,17 @@
   # Important to resolve .local domains of printers, otherwise you get an error
   # like  "Impossible to connect to XXX.local: Name or service not known"
   services.avahi.nssmdns = true;
-  services.printing.enable = true;
+  hardware.sane.enable = true;
+
+  services.paperless = {
+    enable = true;
+    passwordFile = builtins.toFile "password" "admin";
+  };
+
+  services.printing = {
+    enable = true;
+    drivers = [
+      (pkgs.callPackage ./driver.nix {})
+    ];
+  };
 }

modules/printing/driver.nix

@@ -0,0 +1,86 @@
+{
+  lib,
+  stdenv,
+  fetchurl,
+  dpkg,
+  autoPatchelfHook,
+  makeWrapper,
+  perl,
+  gnused,
+  ghostscript,
+  file,
+  coreutils,
+  gnugrep,
+  which,
+}: let
+  arches = ["x86_64" "i686" "armv7l"];
+
+  runtimeDeps = [
+    ghostscript
+    file
+    gnused
+    gnugrep
+    coreutils
+    which
+  ];
+in
+  stdenv.mkDerivation rec {
+    pname = "cups-brother-mfcl2710dw";
+    version = "4.0.0-1";
+
+    nativeBuildInputs = [dpkg makeWrapper autoPatchelfHook];
+    buildInputs = [perl];
+
+    dontUnpack = true;
+
+    src = fetchurl {
+      url = "https://download.brother.com/welcome/dlf103526/mfcl2710dwpdrv-${version}.i386.deb";
+      hash = "sha256-OOTvbCuyxw4k01CTMuBqG2boMN13q5xC7LacaweGmyw=";
+    };
+
+    installPhase =
+      ''
+        runHook preInstall
+
+        mkdir -p $out
+        dpkg-deb -x $src $out
+
+        # delete unnecessary files for the current architecture
+      ''
+      + lib.concatMapStrings (arch: ''
+        echo Deleting files for ${arch}
+        rm -r "$out/opt/brother/Printers/MFCL2710DW/lpd/${arch}"
+      '') (builtins.filter (arch: arch != stdenv.hostPlatform.linuxArch) arches)
+      + ''
+
+        # bundled scripts don't understand the arch subdirectories for some reason
+        ln -s \
+          "$out/opt/brother/Printers/MFCL2710DW/lpd/${stdenv.hostPlatform.linuxArch}/"* \
+          "$out/opt/brother/Printers/MFCL2710DW/lpd/"
+
+        # Fix global references and replace auto discovery mechanism with hardcoded values
+        substituteInPlace $out/opt/brother/Printers/MFCL2710DW/lpd/lpdfilter \
+          --replace /opt "$out/opt" \
+          --replace "my \$BR_PRT_PATH =" "my \$BR_PRT_PATH = \"$out/opt/brother/Printers/MFCL2710DW\"; #" \
+          --replace "PRINTER =~" "PRINTER = \"MFCL2710DW\"; #"
+
+        # Make sure all executables have the necessary runtime dependencies available
+        find "$out" -executable -and -type f | while read file; do
+          wrapProgram "$file" --prefix PATH : "${lib.makeBinPath runtimeDeps}"
+        done
+
+        # Symlink filter and ppd into a location where CUPS will discover it
+        mkdir -p $out/lib/cups/filter
+        mkdir -p $out/share/cups/model
+
+        ln -s \
+          $out/opt/brother/Printers/MFCL2710DW/lpd/lpdfilter \
+          $out/lib/cups/filter/brother_lpdwrapper_MFCL2710DW
+
+        ln -s \
+          $out/opt/brother/Printers/MFCL2710DW/cupswrapper/brother-MFCL2710DW-cups-en.ppd \
+          $out/share/cups/model/
+
+        runHook postInstall
+      '';
+  }