Development dependencies #

These instructions use Ubuntu 26.04 package names. Install only the optional groups needed for your work. Build commands run as your normal user; sudo is for package installation and the specific native-session operations that need it.

Rust and native libraries #

Install Rust through rustup. The repository's rust-toolchain.toml selects the toolchain, Clippy, rustfmt, rust-analyzer, and Rust sources automatically. Check it with rustup show from the repository root; changing your global default isn't needed.

sudo apt-get update
sudo apt-get install -y \
  build-essential pkg-config clang libclang-dev \
  libwayland-dev wayland-protocols wayland-utils libinput-dev \
  libxkbcommon-dev libxkbcommon-x11-dev libudev-dev libseat-dev \
  libgbm-dev libegl1-mesa-dev libgles2-mesa-dev libdrm-dev \
  libsystemd-dev libglib2.0-dev libglib2.0-bin libgtk-4-dev \
  libgtk4-session-lock-dev libgtk4-layer-shell-dev libpam0g-dev \
  libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev \
  python3 python3-venv dbus xdg-utils fonts-liberation

The locker requires GTK 4.12 or newer and the native gtk4-session-lock library; use version 1.3 or newer for its lifecycle fixes. These are separate from the Rust bindings fetched by Cargo. The GStreamer development libraries support workspace test targets. fonts-liberation supplies the shell's intended font. The pkg-config name for xkbcommon is xkbcommon, not libxkbcommon.

The compositor and shell need working graphics drivers. For software-rendered headless tests, install libgl1-mesa-dri and mesa-vulkan-drivers, then follow the E2E environment setup.

Desktop runtime #

A full native session uses logind/libseat and these runtime packages:

sudo apt-get install -y \
  mate-polkit xdg-desktop-portal xdg-desktop-portal-gtk fuse3 \
  gsettings-desktop-schemas pulseaudio-utils upower xwayland foot

• MATE polkit supplies a Wayland-capable authentication agent. Don't substitute an agent that assumes X11 window handles.
• The GTK portal backend provides file dialogs and related desktop integration. zenity is an optional file-dialog fallback for nested or diagnostic sessions.
• pactl from pulseaudio-utils must support JSON output (version 16 or newer). It works with PulseAudio or PipeWire's PulseAudio service; no second audio server is needed. See sound and brightness.
• UPower supplies battery/UPS status. Systems without a battery need no fake indicator. Xwayland enables X11 applications.
• Super+Return launches foot directly, so the terminal shortcut requires it. The same terminal is also used by integration tests.
• Installed GSettings schemas and glib-compile-schemas let the supervisor prepare private GTK window-control defaults. Existing user overrides remain authoritative; no host dconf settings are rewritten.

The installer provisions the dedicated hearthspace-lock PAM service through a checked transaction and preserves custom policies. A source-tree native run also needs that service. Use the installer rather than copying an unchecked PAM file. Missing or unreadable policy makes locking unavailable; never add an authentication bypass for development.

Shared-session portals remain user-manager services. Private test sessions own their separate helpers and profiles. Read application integration before diagnosing bus, audio, or portal routing by changing global environment variables. Hearthspace doesn't require persistent logind configuration, new backlight permissions, or disabling application sandboxes.

Test and recording tools #

sudo apt-get install -y \
  at-spi2-core libayatana-appindicator3-1 libgtk-3-0t64 \
  libinput-tools python3-evdev ffmpeg

AT-SPI and AppIndicator support are needed for the corresponding required integration tests. python3-evdev and libinput-tools are for native input fixtures; these use temporary owned uinput devices, without persistent udev rules. FFmpeg supplies ffmpeg and ffprobe for recordings.

For optional GTK touch and titlebar acceptance, also install:

sudo apt-get install -y python3-gi gir1.2-gtk-3.0 gnome-calculator

The fixtures use Python's PyGObject bindings and GTK 3 introspection data; the touch workflow also exercises GNOME Calculator. The titlebar matrix needs GTK 4 introspection data (gir1.2-gtk-4.0), provided by the libgtk-4-dev dependency above.

Native automation additionally requires systemd/logind, login PAM, util-linux, a spare VT on seat0, and authorized noninteractive sudo. The agent must stay outside the desktop under test. Don't make a blanket sudoers or lingering change as part of setup; have the machine's administrator choose an appropriate access policy. See native testing.

Use Ruff 0.17.0, matching CI, in a virtual environment outside the repository or a tool runner:

ruff_env="${XDG_DATA_HOME:-$HOME/.local/share}/hearthspace-dev/ruff-venv"
python3 -m venv "$ruff_env"
"$ruff_env/bin/pip" install ruff==0.17.0
"$ruff_env/bin/ruff" check scripts
"$ruff_env/bin/ruff" format --check scripts

Use that executable in place of ruff in the contributor checks unless it's on PATH. Install cargo-deny through its upstream instructions. Neither tool needs a system Python override or root-owned Cargo files.

Optional integrations #

• Settings development watcher: put either cargo-watch or watchexec on PATH to rebuild Settings as you edit. The supervisor prefers cargo-watch when both are available. Use --no-watch-apps to disable it; neither tool is needed for an ordinary desktop session.
• Remote desktop: WayVNC 0.9 or newer, with the capture protocols used by Hearthspace. Follow remote desktop for localhost binding, authentication, and SSH transport.
• Local AI: an already-installed Ollama service supporting the D1 POST /v1/systemone endpoint. Ordinary /api/chat support isn't sufficient. Hearthspace's opt-in manages its model, not the host service. See window groups.
• Application acceptance: install the actual apps you intend to test. Use private profiles and the daily-app workflow. Browser package choices and Snap constraints belong to app compatibility and Snap applications, not a required package downgrade.
• Cursor editing: install x11-apps for xcursorgen and ImageMagick; follow cursor assets.

Confined notification tools #

A distribution's notify-send AppArmor policy may omit notification capability queries or action/closure signals. If denials establish that problem, inspect scripts/setup/notify-send.apparmor. Merge its narrow rules into /etc/apparmor.d/local/notify-send, preserving any existing local rules, then reload the owning profile:

sudo apparmor_parser -r /etc/apparmor.d/notify-send

The profile remains enforced. To undo the addition, remove only the added rules and reload it again. Don't replace an administrator's local override or disable AppArmor to make a notification test pass. See notifications.