overthinkos/mutter
ov-selkies/skills/mutter/SKILL.md
GNOME Mutter Wayland compositor running headless inside containers with virtual monitor. Use when working with Mutter, GNOME desktop, or headless compositor setup.
data-ai
Updated May 5, 2026
$ install --global
skillsauthnpx skillsauth add overthinkos/overthink-plugins mutterInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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Last scanned: May 5, 2026, 7:15 AM169.1s1 file scanned
SKILL.md
- name:
- mutter
- description:
- |
mutter -- GNOME Mutter headless Wayland compositor
Layer Properties
| Property | Value |
|----------|-------|
| Dependencies | dbus |
| Service | mutter (supervisord, priority 10) |
| Install files | layer.yml, tasks:, mutter-wrapper |
Environment Variables
| Variable | Value |
|----------|-------|
| XDG_RUNTIME_DIR | /tmp |
| WAYLAND_DISPLAY | wayland-0 |
| XDG_CURRENT_DESKTOP | GNOME |
| XDG_SESSION_TYPE | wayland |
| EGL_LOG_LEVEL | fatal |
Packages
mutter(RPM) -- GNOME Wayland compositor (has hard deps onlibeisandpipewire)xorg-x11-server-Xwayland(RPM) -- XWayland supportmesa-dri-drivers,mesa-vulkan-drivers,libglvnd-egl,libglvnd-gles,egl-wayland(RPM) -- GPU drivers
Startup (mutter-wrapper)
- GPU detection: NVIDIA (CDI env vars), AMD/Intel (DRI render nodes)
- Waits for PipeWire socket (
/tmp/pipewire-0) and D-Bus session socket - Starts
mutter --headless --virtual-monitor 1920x1080 - Waits for Wayland socket, symlinks to
wayland-0if needed - Exports
WAYLAND_DISPLAYandXDG_SESSION_TYPEto D-Bus activation environment
D-Bus Interfaces
Mutter registers native D-Bus interfaces (not Wayland protocols):
org.gnome.Mutter.ScreenCast-- PipeWire-based screen captureorg.gnome.Mutter.RemoteDesktop-- EIS/libei input injectionorg.gnome.Mutter.DisplayConfig-- Display/monitor management
This is architecturally different from KWin (Wayland protocol) and Sway (wlr-screencopy). The D-Bus interfaces work in headless mode.
Key Difference: XDG_SESSION_TYPE
xdg-desktop-portal-gnome requires XDG_SESSION_TYPE=wayland to initialize its display server connection. Without it, ScreenCast/RemoteDesktop interfaces are not registered. This env var is normally set by gdm/gnome-session but must be set explicitly in headless containers.
Related Layers
/ov-foundation:dbus-- D-Bus session bus (dependency)/ov-selkies:kwin-- KDE compositor (alternative, disabled due to screencast limitation)/ov-selkies:sway-- wlroots compositor (alternative)/ov-selkies:niri-- Smithay compositor (alternative)/ov-selkies:mutter-apps-- GNOME desktop applications/ov-selkies:mutter-desktop-- full Mutter desktop composition
Used In Images
Not used in any current image definition. Part of the mutter-desktop metalayer composition.
When to Use This Skill
Use when working with:
- Mutter/GNOME Wayland compositor inside containers
- GNOME-based headless desktop environments
- Portal-based screen capture and input injection
Related
/ov-build:layer— layer authoring reference (layer.ymlschema, task verbs, service declarations)/ov-build:eval— declarative testing (tests:block,ov eval image,ov test)
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