fix: ship a numbered udev rule file for vial since otherwise it gets overwritten by systemd's udev file

Reviewed-on: #69

hosts/argon/configuration.nix

@@ -2,6 +2,7 @@
 
 {
   imports = [
+    ../../modules/nixos/appimage.nix
     ../../modules/nixos/astro.nix
     ../../modules/nixos/audio.nix
     ../../modules/nixos/bootloader.nix
@@ -25,6 +26,7 @@
     ../../modules/nixos/steam.nix
     ../../modules/nixos/thunar.nix
     ../../modules/nixos/users.nix
+    ../../modules/nixos/vial.nix
   ];
 
   # set hostname

hosts/neon/configuration.nix

@@ -2,6 +2,7 @@
 
 {
   imports = [
+    ../../modules/nixos/appimage.nix
     ../../modules/nixos/astro.nix
     ../../modules/nixos/audio.nix
     ../../modules/nixos/bootloader.nix
@@ -21,6 +22,7 @@
     ../../modules/nixos/settings.nix
     ../../modules/nixos/steam.nix
     ../../modules/nixos/users.nix
+    ../../modules/nixos/vial.nix
   ];
 
   # set hostname

modules/nixos/appimage.nix

@@ -0,0 +1,19 @@
+{ config, lib, pkgs, ... }:
+
+{
+  # AppImages ship a squashfs payload that the bundled runtime mounts through
+  # libfuse.so.2 at startup. nix-ld resolves the ELF interpreter but not that
+  # dlopen, so running one directly dies with "dlopen(): error loading
+  # libfuse.so.2". appimage-run sidesteps the mount entirely: it unpacks the
+  # image and runs the payload inside an FHS sandbox, which the bundled Qt and
+  # electron style binaries need anyway.
+  #
+  # Used for the BitBox02 wallet AppImage, downloaded fresh from
+  # https://bitbox.swiss/download/ rather than installed from nixpkgs.
+  programs.appimage = {
+    enable = true;
+    # register AppImages with binfmt_misc so ./Something.AppImage runs as-is,
+    # no appimage-run prefix to remember.
+    binfmt = true;
+  };
+}

modules/nixos/packages.nix

@@ -35,6 +35,7 @@
     tree
     unzip
     usbutils
+    vial
     vim
     wget
     which

modules/nixos/vial.nix

@@ -0,0 +1,26 @@
+{ config, lib, pkgs, ... }:
+
+{
+  # Vial-capable keyboards (lily58 pro r2g) expose a second, non-keyboard raw
+  # HID interface that vial.rocks drives over WebHID. Its /dev/hidraw* node is
+  # root-only by default, so neither chromium nor the native app can open it.
+  #
+  # This has to ship as a numbered rules file rather than via
+  # services.udev.extraRules: extraRules lands in 99-local.rules, but the
+  # builtin that turns TAG+="uaccess" into an actual ACL is invoked from
+  # systemd's 73-seat-late.rules. A tag set at 99 is set too late to be seen,
+  # so the device ends up correctly tagged and still unreadable. 60- sorts
+  # safely ahead of 73.
+  services.udev.packages = [
+    (pkgs.writeTextFile {
+      name = "vial-udev-rules";
+      destination = "/lib/udev/rules.d/60-vial.rules";
+      # Vial firmware advertises itself through a magic USB serial, so this
+      # matches any vial board rather than just the lily58. uaccess hands the
+      # device to whoever owns the active seat, no group membership needed.
+      text = ''
+        KERNEL=="hidraw*", SUBSYSTEM=="hidraw", ATTRS{serial}=="*vial:f64c2b3c*", TAG+="uaccess"
+      '';
+    })
+  ];
+}