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ashisgreat22 2026-01-14 21:24:19 +01:00
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# Citron Emulator Sandboxed with nix-bwrapper
# Runs AppImage directly (self-extracting) since pkgforge uses non-standard compression
# Uses manual DBus proxy approach like Steam/Faugus for stronger isolation
{
config,
lib,
pkgs,
inputs,
...
}:
let
bwrapperPkgs = pkgs.extend inputs.nix-bwrapper.overlays.default;
pname = "citron";
version = "0.12.25";
appId = "org.citron_emu.citron";
citronAppImage = pkgs.fetchurl {
url = "https://github.com/pkgforge-dev/Citron-AppImage/releases/download/0.12.25%402025-12-26_1766769485/Citron-0.12.25-anylinux-x86_64.AppImage";
sha256 = "sha256-BLTX4IZX5BNt7NlUti8NILL76NCzsPShkvx8BS/pl38=";
};
# Create a wrapper script that runs the AppImage directly
# AppImages are self-extracting executables
citronWrapper = pkgs.writeShellScriptBin "citron" ''
# Ensure the AppImage can extract to a writable location
export APPIMAGE_EXTRACT_AND_RUN=1
export TMPDIR="$HOME/.cache/citron-tmp"
mkdir -p "$TMPDIR"
# Copy AppImage to cache and make executable if needed
# Use a unique name based on the hash to avoid busy-file issues
# Sanitize hash to remove slashes which break paths
APPIMAGE_HASH=$(echo "${citronAppImage.outputHash}" | tr '/' '_')
APPIMAGE="$TMPDIR/citron-$APPIMAGE_HASH.AppImage"
if [ ! -f "$APPIMAGE" ]; then
# Clean up old versions
rm -f "$TMPDIR"/citron-*.AppImage
cp "${citronAppImage}" "$APPIMAGE"
chmod 755 "$APPIMAGE"
fi
exec "$APPIMAGE" "$@"
'';
# Final package with proper attributes
citron =
pkgs.symlinkJoin {
name = "${pname}-${version}";
paths = [ citronWrapper ];
postBuild = ''
mkdir -p $out/share/applications
cat > $out/share/applications/${appId}.desktop << EOF
[Desktop Entry]
Type=Application
Name=Citron
Comment=Nintendo Switch Emulator
Exec=citron
Icon=citron
Terminal=false
Categories=Game;Emulator;
EOF
'';
}
// {
inherit pname version;
meta = {
description = "Nintendo Switch Emulator";
homepage = "https://citron-emu.org/";
mainProgram = "citron";
};
};
in
{
nixpkgs.overlays = [
(final: prev: {
citron-sandboxed = bwrapperPkgs.mkBwrapper {
app = {
package = citron;
id = appId;
env = {
XDG_DATA_DIRS = "$XDG_DATA_DIRS";
QT_QPA_PLATFORM = "wayland;xcb";
XDG_CURRENT_DESKTOP = "KDE";
# Allow AppImage to extract and run
APPIMAGE_EXTRACT_AND_RUN = "1";
};
};
# Enable X11 and Wayland
sockets.x11 = true;
sockets.wayland = true;
# Disable Flatpak emulation
flatpak.enable = false;
fhsenv.opts = {
unshareUser = true;
unshareUts = false;
unshareCgroup = false;
unsharePid = false;
unshareNet = false; # Need network for online features
unshareIpc = false;
};
fhsenv.bwrap.baseArgs = lib.mkForce [
"--new-session"
"--proc /proc"
"--dev /dev"
"--dev-bind /dev/dri /dev/dri" # GPU acceleration
"--dev-bind /dev/shm /dev/shm" # Shared memory
"--dev-bind-try /dev/uinput /dev/uinput" # Controller support
"--dev-bind-try /dev/input /dev/input"
"--tmpfs /home"
"--tmpfs /tmp"
"--tmpfs /run"
"--tmpfs /run"
"--dir /run/user"
"--dir /run/user/${toString config.users.users.ashie.uid}"
# Fix for amdgpu.ids missing - use tmpfs so mkdir can succeed
"--tmpfs /usr/share"
"--ro-bind ${pkgs.libdrm}/share/libdrm /usr/share/libdrm"
# System paths
"--ro-bind /sys /sys"
"--ro-bind-try /run/current-system /run/current-system"
"--ro-bind-try /run/opengl-driver /run/opengl-driver"
"--ro-bind-try /run/opengl-driver-32 /run/opengl-driver-32"
"--ro-bind-try /nix/store /nix/store"
"--dir /run/systemd/resolve"
"--ro-bind-try /run/systemd/resolve /run/systemd/resolve"
# udev for controller hotplug
"--ro-bind-try /run/udev /run/udev"
];
# Disable built-in DBus module (invokes bwrap without --unshare-user)
dbus.enable = false;
# Manually set up DBus proxy with --unshare-user (session bus only)
# Also create required directories before bwrap runs
script.preCmds.stage2 = ''
# Create directories that bwrap will bind
mkdir -p "$HOME/.cache/citron-tmp"
mkdir -p "$HOME/.config/citron"
mkdir -p "$HOME/.local/share/citron"
mkdir -p "$HOME/Games/Switch"
''
+ (import ./sandbox-utils.nix { inherit pkgs lib; }).mkDbusProxyScript {
inherit appId;
enableSystemBus = false;
proxyArgs = [
"--filter"
''--talk="org.freedesktop.portal.*"''
''--call="org.freedesktop.portal.*=*@/org/freedesktop/portal/desktop"''
''--talk="org.freedesktop.Notifications"''
''--talk="org.freedesktop.ScreenSaver"''
''--talk="org.kde.StatusNotifierWatcher"''
''--talk="org.kde.KWin"''
''--talk="org.gnome.Mutter.DisplayConfig"''
''--talk="org.freedesktop.secrets"''
''--talk="com.feralinteractive.GameMode"''
''--own="${appId}"''
''--own="${appId}.*"''
];
};
fhsenv.bwrap.additionalArgs = [
# D-Bus session proxy only
''--bind "$XDG_RUNTIME_DIR/app/${appId}/bus" "$XDG_RUNTIME_DIR/bus"''
# Wayland socket
''--bind "$XDG_RUNTIME_DIR/$WAYLAND_DISPLAY" "$XDG_RUNTIME_DIR/$WAYLAND_DISPLAY"''
# PipeWire + Pulse
''--bind "$XDG_RUNTIME_DIR/pipewire-0" "$XDG_RUNTIME_DIR/pipewire-0"''
''--bind "$XDG_RUNTIME_DIR/pulse" "$XDG_RUNTIME_DIR/pulse"''
# Manual mounts for data persistence
"--ro-bind-try $HOME/.config/kdedefaults $HOME/.config/kdedefaults"
"--ro-bind-try $HOME/.local/share/color-schemes $HOME/.local/share/color-schemes"
"--ro-bind-try $HOME/.config/fontconfig $HOME/.config/fontconfig"
"--ro-bind-try $HOME/.local/share/fonts $HOME/.local/share/fonts"
"--ro-bind-try $HOME/.icons $HOME/.icons"
"--ro-bind-try $HOME/.themes $HOME/.themes"
"--ro-bind-try $HOME/.config/qt6ct $HOME/.config/qt6ct"
"--ro-bind-try $HOME/.config/Kvantum $HOME/.config/Kvantum"
"--ro-bind-try $HOME/.config/MangoHud $HOME/.config/MangoHud"
# Read-write mounts
"--bind $HOME/Games/Switch $HOME/Games/Switch"
"--bind $HOME/.config/citron $HOME/.config/citron"
"--bind $HOME/.local/share/citron $HOME/.local/share/citron"
"--bind $HOME/.cache/citron-tmp $HOME/.cache/citron-tmp"
];
};
})
];
}