ekklesiaandClaude Opus 5
87b55761c6
The whole appliance UI is now configuration for a desktop Debian already ships: a Plasma 6.3 session with a colour scheme, a look and feel package that builds the bar, window rules, and KDE's own Kiosk restrictions. Two things were measured rather than assumed, and both changed a decision. Plasma restarts a crashed panel three times a minute and then gives up, which is the failure a classroom has already had. Four lines of systemd drop-in make it unconditional; the panel then survived eight SIGKILLs a second apart, back each time in 2.4s. Plasma draws a minimised task and a background task identically, so the five states the room needs cannot all be shown. Rather than write a task manager, the classroom removes minimise: clicking a launcher always means show me this. Co-Authored-By: Claude Opus 5 <[email protected]>
73 lines
3.2 KiB
Docker
73 lines
3.2 KiB
Docker
# Classroom v2 test lab: a full Debian 13 Plasma 6 desktop, running under
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# systemd, inside a container. It exists because the development host is
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# itself a VM with no /dev/kvm, so a real virtual machine cannot be created
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# here. See docs/classroom-v2-experiment.md.
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#
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# docker build -f tools/lab/Dockerfile.plasma -t classroom-v2-lab:plasma .
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# tools/lab/lab up
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#
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FROM debian:trixie
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ENV DEBIAN_FRONTEND=noninteractive
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ENV container=docker
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# systemd, so the session is supervised the way it would be on a real machine
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RUN apt-get update && apt-get install -y systemd systemd-sysv dbus dbus-user-session \
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&& rm -rf /var/lib/apt/lists/*
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# The desktop under test.
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RUN apt-get update && apt-get install -y \
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plasma-desktop plasma-workspace kwin-wayland \
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plasma-nm plasma-pa \
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&& rm -rf /var/lib/apt/lists/*
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# Software rendering, X11 apps, fonts, and the tools the lab drives it with.
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RUN apt-get update && apt-get install -y --no-install-recommends \
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libgl1-mesa-dri libglx-mesa0 mesa-utils-bin libegl-mesa0 \
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xwayland \
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fonts-noto-core fonts-dejavu-core fonts-liberation \
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kde-cli-tools qdbus-qt6 \
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sway swaybg grim wtype foot \
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python3 python3-gi gir1.2-gtk-3.0 \
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curl ca-certificates gnupg procps psmisc less vim-tiny socat jq \
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&& rm -rf /var/lib/apt/lists/*
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RUN useradd -m -u 1000 -s /bin/bash classroom \
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&& usermod -aG video,render,audio classroom \
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&& passwd -d classroom \
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&& mkdir -p /run/user/1000 && chown classroom:classroom /run/user/1000 \
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&& systemctl enable systemd-logind
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# Linger so the classroom user's systemd instance starts with the container,
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# which is exactly how the appliance would run.
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RUN mkdir -p /var/lib/systemd/linger && touch /var/lib/systemd/linger/classroom
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STOPSIGNAL SIGRTMIN+3
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CMD ["/sbin/init"]
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# Screenshots. KWin's org.kde.KWin.ScreenShot2 only answers callers it
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# recognises by path, and Spectacle is one of them, so this is the
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# sanctioned way to capture a KWin session that has no outer compositor.
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RUN apt-get update && apt-get install -y --no-install-recommends kde-spectacle \
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&& rm -rf /var/lib/apt/lists/*
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# The classroom's browser, from Google's own repository, the same way a
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# classroom machine gets it. Testing the browser question on a different
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# browser would not answer it.
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RUN apt-get update && apt-get install -y --no-install-recommends gnupg \
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&& install -d -m 0755 /etc/apt/keyrings \
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&& curl -fsS https://dl.google.com/linux/linux_signing_key.pub \
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| gpg --dearmor --batch --yes --output /etc/apt/keyrings/google-chrome.gpg \
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&& echo 'deb [arch=amd64 signed-by=/etc/apt/keyrings/google-chrome.gpg] https://dl.google.com/linux/chrome/deb/ stable main' \
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> /etc/apt/sources.list.d/google-chrome.list \
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&& apt-get update && apt-get install -y --no-install-recommends google-chrome-stable \
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&& rm -rf /var/lib/apt/lists/*
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# VLC, CUPS and PipeWire: the rest of the classroom's runtime, so the
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# desktop is judged with the room's real applications in it.
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RUN apt-get update && apt-get install -y --no-install-recommends \
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vlc vlc-plugin-base cups cups-client cups-filters \
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pipewire pipewire-pulse wireplumber pulseaudio-utils \
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libnotify-bin \
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&& rm -rf /var/lib/apt/lists/*
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