sane: Add support for the unfree Fujitsu ScanSnap drivers

This adds the scanner files already linked from the
`etc/sane.d/epjitsu.conf` file, which are extracted from the Windows
drivers and mirrored on GitHub.

Being a Japanese hardware vendor, Fujitsu’s software release &
licensing methods are horrifying, but their scanners are some of the
best, so we should definitly have discoverable support for them, which
this patch hopefully adds.

Inspiration was taken from the following sources:
https://www.josharcher.uk/code/install-scansnap-s1300-drivers-linux/
https://ubuntuforums.org/archive/index.php/t-1461915.html
https://github.com/stevleibelt/scansnap-firmware

2 files changed, 25 insertions, 1 deletions

diff --git a/pkgs/applications/graphics/sane/backends/default.nix b/pkgs/applications/graphics/sane/backends/default.nix
index 821a97e3587..3d3c752dcde 100644
--- a/pkgs/applications/graphics/sane/backends/default.nix
+++ b/pkgs/applications/graphics/sane/backends/default.nix
@@ -2,12 +2,16 @@
 , gettext, pkg-config, python3
 , avahi, libgphoto2, libieee1284, libjpeg, libpng, libtiff, libusb1, libv4l, net-snmp
 , curl, systemd, libxml2, poppler
+, sane-drivers
 
 # List of { src name backend } attibute sets - see installFirmware below:
 , extraFirmware ? []
 
 # For backwards compatibility with older setups; use extraFirmware instead:
 , gt68xxFirmware ? null, snapscanFirmware ? null
+
+# Not included by default, scan snap drivers require fetching of unfree binaries.
+, scanSnapDriversUnfree ? false, scanSnapDriversPackage ? sane-drivers.epjitsu
 }:
 
 stdenv.mkDerivation {
@@ -88,7 +92,14 @@ stdenv.mkDerivation {
 
     # net.conf conflicts with the file generated by the nixos module
     rm $out/etc/sane.d/net.conf
-  '' + lib.concatStrings (builtins.map installFirmware compatFirmware);
+
+  ''
+  + lib.optionalString scanSnapDriversUnfree ''
+    # the ScanSnap drivers live under the epjitsu subdirectory, which was already created by the build but is empty.
+    rmdir $out/share/sane/epjitsu
+    ln -svT ${scanSnapDriversPackage} $out/share/sane/epjitsu
+  ''
+  + lib.concatStrings (builtins.map installFirmware compatFirmware);
 
   meta = with lib; {
     description = "SANE (Scanner Access Now Easy) backends";
diff --git a/pkgs/applications/graphics/sane/drivers.nix b/pkgs/applications/graphics/sane/drivers.nix
new file mode 100644
index 00000000000..9f1a644f4fa
--- /dev/null
+++ b/pkgs/applications/graphics/sane/drivers.nix
@@ -0,0 +1,13 @@
+{ lib, fetchFromGitHub }:
+
+{
+  # Fujitsu ScanSnap
+  epjitsu = fetchFromGitHub {
+    name = "scansnap-firmware";
+    owner = "stevleibelt";
+    repo = "scansnap-firmware";
+    rev = "96c3a8b2a4e4f1ccc4e5827c5eb5598084fd17c8";
+    sha256 = "1inchnvaqyw9d0skpg8hp5rpn27c09q58lsr42by4bahpbx5qday";
+    meta.license = lib.licenses.unfree;
+  };
+}