swaylock-plugin: init (but i likely won't be using it)

pkgs/additional/swaylock-plugin/default.nix

@@ -0,0 +1,65 @@
+# STATUS:
+# - can't find any virtual keyboard it works with
+# - run with `swaylock-plugin --command='/nix/store/my-virtual-keyboard-.../bin/vkbd'`
+#   - if it crashes, launch `sane-open-desktop swaylock.desktop` from another TTY
+#   - `cd /etc/pam.d; sudo cp swaylock swaylock-plugin`
+{ lib, stdenv
+, cairo
+, fetchFromGitHub
+, gdk-pixbuf
+, libxkbcommon
+, meson
+, ninja
+, pam
+, pkg-config
+, scdoc
+, wayland
+, wayland-protocols
+, wayland-scanner
+}:
+stdenv.mkDerivation {
+  pname = "swaylock-plugin";
+  version = "1.6-unstable-2024-02-21";  #< from meson.build
+
+  src = fetchFromGitHub {
+    owner = "mstoeckl";
+    repo = "swaylock-plugin";
+    rev = "1dd15b6ecbe91be7a3dc4a0fa9514fb166fb2e07";
+    hash = "sha256-xWyDDT8sXAL58HtA9ifzCenKMmOZquzXZaz3ttGGJuY=";
+  };
+
+  nativeBuildInputs = [
+    meson
+    ninja
+    pkg-config
+    scdoc
+    wayland-scanner
+  ];
+  buildInputs = [
+    cairo
+    gdk-pixbuf
+    libxkbcommon
+    pam
+    wayland
+    wayland-protocols
+  ];
+
+  env.NIX_CFLAGS_COMPILE = "-Wno-error=maybe-uninitialized";
+
+  meta = with lib; {
+    description = "Screen locker for Wayland -- fork with background plugin support";
+    longDescription = ''
+      This is a fork of swaylock, a screen locking utility for Wayland compositors.
+      With swaylock-plugin, you can for your lockscreen background display the
+      animated output from any wallpaper program that implements the
+      wlr-layer-shell-unstable-v1 protocol.
+
+      N.B.: it's necessary to install /etc/pam.d/swaylock-plugin without which
+      swaylock-plugin will never unlock your session.
+    '';
+    inherit (src.meta) homepage;
+    mainProgram = "swaylock-plugin";
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ colinsane ];
+  };
+}

pkgs/default.nix

@@ -62,6 +62,7 @@ let
     signal-desktop-from-src = callPackage ./additional/signal-desktop-from-src { };
     static-nix-shell = callPackage ./additional/static-nix-shell { };
     sublime-music-mobile = callPackage ./additional/sublime-music-mobile { };
+    swaylock-plugin = callPackage ./additional/swaylock-plugin { };
     sxmo-utils = callPackage ./additional/sxmo-utils { };
     tow-boot-pinephone = callPackage ./additional/tow-boot-pinephone { };
     tree-sitter-nix-shell = callPackage ./additional/tree-sitter-nix-shell { };