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setup.md

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Building

Compile-time Dependencies

The following libraries must be installed before compiling Jay:

  • libinput.so
  • libgbm.so
  • libudev.so
  • libpangocairo-1.0.so

You must also have a C compiler (GCC or Clang) and the latest version of rust installed. You can install rust with rustup.

Runtime Dependencies

Most of these dependencies are optional and will enable additional features.

  • Linux 6.7: Required for explicit sync.
  • Xwayland: Required for running X applications.
  • Pipewire: Required for screen sharing.
  • logind (part of systemd): Required when running Jay from a virtual terminal.
  • libEGL.so and libGLESv2.so: Required for the OpenGL renderer.
  • libvulkan.so: Required for the Vulkan renderer.

Note that Jay will not work if neither the OpenGL nor the Vulkan renderer are available.

Compiling

To compile the latest stable version of Jay, run

cargo install --locked jay-compositor

This will install Jay under $HOME/.cargo/bin/jay.

If you want to use the latest version from git, run

cargo install --locked --git https://github.com/mahkoh/jay.git jay-compositor

If you only want to build Jay without installing it, run the following command from within this repository:

cargo build --release

The binary is then available under ./target/release/jay.

Running with CAP_SYS_NICE

Jay supports being started with CAP_SYS_NICE capabilities. For example, such capabilities can be added to the binary via

~# setcap cap_sys_nice=p jay

If CAP_SYS_NICE is available, Jay will, by default, elevate its scheduler to SCHED_RR and create Vulkan queues with the highest available priority. This can improve responsiveness if the CPU or GPU are under high load.

If Jay is started with the environment variable JAY_NO_REALTIME=1 or a config.so exists, then Jay will not elevate its scheduler but will still create elevated Vulkan queues.

Jay will drop all capabilities almost immediately after being started. Before that, it will spawn a dedicated thread that retains the CAP_SYS_NICE capability to create elevated Vulkan queues later.

If Jay has elevated its scheduler to SCHED_RR, then it will refuse to load config.so configurations. Otherwise unprivileged applications would be able to run arbitrary code with SCHED_RR by crafting a dedicated config.so. This behavior can be overridden by compiling Jay with JAY_ALLOW_REALTIME_CONFIG_SO=1.

Setup

Configuration

See config.md.

Screen Sharing

This step is only required to enable screen sharing.

  1. Copy ../etc/jay.portal to /usr/share/xdg-desktop-portal/portals/jay.portal.
  2. Copy ../etc/jay-portals.conf to /usr/share/xdg-desktop-portal/jay-portals.conf.

Then restart xdg-deskop-portal.

Running

  1. Switch to a virtual terminal by pressing ctrl-alt-F2 (or F3, F4, ...).
  2. Run jay run.

If you have not yet changed the default configuration, you can

  • quit Jay by pressing alt-q,
  • start Alacritty by pressing the left Windows key.