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cnbug c25cbb0d48 VNC: switch to xvfb+x11vnc, add Ubuntu GNOME session + extensions
Major changes to the VNC generator (generators/middleware.py):

  1. Replace Xtigervnc + vncserver wrapper with xvfb + x11vnc.
     - Xtigervnc defaults to daemon mode (no -fg flag exists), so systemd
       Type=simple couldn't track it; x11vnc attaches to Xvfb in
       foreground, works cleanly with Type=simple.
     - Use display :99 via xvfb-run -a so we never collide with the
       physical GDM/Xorg on :0 (avoids 'server already running').

  2. GNOME xstartup: switch to Ubuntu's canonical session.
     - XDG_CURRENT_DESKTOP=ubuntu:GNOME (was 'GNOME'; the bare form
       doesn't match Ubuntu's /usr/share/gnome-session/sessions/ entry
       and apps like gnome-terminal refuse to launch).
     - XDG_SESSION_TYPE=x11 (x11vnc is X11-only, so be explicit).
     - GNOME_SHELL_SESSION_MODE=ubuntu (Ubuntu-patched gnome-shell hint).

  3. Install extra GNOME packages needed for a usable VNC desktop.
     ubuntu-desktop-minimal alone leaves the user with a blank desktop
     and no way to launch apps. Add:
       - gnome-shell-extension-desktop-icons-ng (desktop icons)
       - gnome-terminal (terminal app)
       - nautilus-extension-gnome-terminal (right-click → open in terminal)
       - gnome-tweaks (advanced settings UI)

  4. Two new UI options:
     - 'Disable Unix socket (-nolisten unix)' — default on (avoids GDM
       collision on /tmp/.X11-unix/X0).
     - 'Disable X11 TCP listener (6001)' — default off (frees 6001 when
       GDM is squatting on it).

  5. .gitignore: exclude other projects' deliverables/ directory and
     a few test output scripts (vnc_*.sh).
2026-08-04 14:27:21 +08:00

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# Python
__pycache__/
*.pyc
*.pyo
*.pyd
*.egg-info/
.venv/
venv/
.env
# Flask instance dir (SQLite + uploads)
instance/
*.sqlite
*.sqlite3
*.db
# Generated test scripts (these are sample outputs, not source)
vnc_cnbugs_gnome.sh
vnc_cnbug_gnome.sh
vnc11.sh
vnc12.sh
vnc13.sh
vnc15.sh
vnc16.sh
vncs13.sh
/tmp/*.sh
# Other projects' assets that may live alongside this repo
deliverables/