detect fingerprint sensors

numtide · Nov 5, 2024 · d0e205e · d0e205e
1 parent c22b916
commit d0e205e
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Showing 4 changed files with 274 additions and 1 deletion.
diff --git a/flake.nix b/flake.nix
@@ -60,6 +60,37 @@
           (pkgs.callPackage ./formatter.nix { inputs = publicInputs // privateInputs; }).config.build.wrapper
         );
 
+        packages = eachSystem (
+          { pkgs, ... }:
+          {
+            fprint-supported-devices = pkgs.libfprint.overrideAttrs (old: {
+              nativeBuildInputs = old.nativeBuildInputs or [ ] ++ [
+                pkgs.jq
+                pkgs.gawk
+              ];
+              buildPhase = ''
+                ninja libfprint/fprint-list-supported-devices
+              '';
+              outputs = [ "out" ];
+              installPhase = ''
+                ./libfprint/fprint-list-supported-devices | \
+                  grep -o -E '(\b[0-9a-fA-F]{4}:[0-9a-fA-F]{4}\b)' | \
+                  awk '{print toupper($0)}' | \
+                  jq -R -s 'split("\n") | map(select(. != "")) | map({key: ., value: true}) | from_entries' > $out
+              '';
+              # we cannot disable doInstallcheck because than we are missing nativeCheckInputs dependencies
+              installCheckPhase = "";
+            });
+            update-fprint-devices = pkgs.writeScriptBin "update-fprint-devices" ''
+              #!${pkgs.stdenv.shell}
+              target=$(git rev-parse --show-toplevel)/modules/nixos/fingerprint/devices.json
+              cat ${publicInputs.self.packages.${pkgs.system}.fprint-supported-devices} > "$target"
+              nix fmt -- "$target"
+              git add -- "$target"
+            '';
+          }
+        );
+
         checks = eachSystem (
           { pkgs, ... }:
           {

diff --git a/modules/nixos/facter.nix b/modules/nixos/facter.nix
@@ -7,9 +7,10 @@
   imports = [
     ./bluetooth.nix
     ./disk.nix
-    ./keyboard.nix
+    ./fingerprint
     ./firmware.nix
     ./graphics
+    ./keyboard.nix
     ./networking
     ./system.nix
     ./virtualisation.nix

diff --git a/modules/nixos/fingerprint/default.nix b/modules/nixos/fingerprint/default.nix
@@ -0,0 +1,47 @@
+{ lib, config, ... }:
+let
+  devices = builtins.fromJSON (builtins.readFile ./devices.json);
+  default = {
+    value = 0;
+  };
+
+  toZeroPaddedHex =
+    n:
+    let
+      hex = lib.toHexString n;
+      len = builtins.stringLength hex;
+    in
+    if len == 1 then
+      "000${hex}"
+    else if len == 2 then
+      "00${hex}"
+    else if len == 3 then
+      "0${hex}"
+    else
+      hex;
+
+  isSupported = lib.any (
+    {
+      vendor ? default,
+      device ? default,
+      bus_type ? {
+        name = "";
+      },
+      ...
+    }:
+    bus_type.name == "USB"
+    && devices ? "${toZeroPaddedHex vendor.value}:${toZeroPaddedHex device.value}"
+  );
+in
+{
+  options.facter.detected.fingerprint.enable = lib.mkEnableOption "Fingerprint devices" // {
+    default =
+      isSupported (config.facter.report.hardware.unknown or [ ])
+      || isSupported (config.facter.report.hardware.fingerprint or [ ])
+      || isSupported (config.facter.report.hardware.usb or [ ]);
+  };
+
+  config.services.fprintd.enable = lib.mkIf config.facter.detected.fingerprint.enable (
+    lib.mkDefault true
+  );
+}
diff --git a/modules/nixos/fingerprint/devices.json b/modules/nixos/fingerprint/devices.json
@@ -0,0 +1,194 @@
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+}