ekklesiaandClaude Opus 5
30a924d945
Two layers for the button, because one is not enough: while a session is running PowerDevil holds logind's handle-power-key inhibitor and acts on the button itself, so a logind drop-in alone would be overruled. logind covers the machine before the session starts, after it ends, and if PowerDevil is not running. Verified: after the drop-in is installed and logind reloaded, it reports ignore for the power, suspend, hibernate and lid keys, and the running session was not disturbed by the reload. Holding the button still cuts the power. That is firmware, below any operating system, and it is deliberately left alone as the only recovery a person standing at a wedged machine has. The maintenance terminal is Meta+Ctrl+Alt+Shift+K, declared in the package rather than seeded into a teacher's configuration, where an update could not reach it. KGlobalAccel read it and registered the component; invoking it opened a working shell. It needed a wrapper. The classroom's Kiosk policy sets shell_access=false and Konsole honours it — measured: with the classroom configuration in its cascade Konsole starts and says "Program to run not set." The restriction is worth keeping everywhere else, so it is lifted for this one process by leaving the classroom's configuration directory out of its cascade. It grants no privilege: the classroom user has no sudo rule, and that restriction was always a barrier in the interface rather than a privilege boundary. Konsole's own entry is shadowed and hidden from /usr/local/share, so nothing is patched and Konsole's package stays maintainable. Nothing is pinned to the panel; a task button appears only while a terminal is open, and closing it returns the bar to three launchers. Co-Authored-By: Claude Opus 5 <[email protected]>
129 lines
5.7 KiB
Bash
Executable File
129 lines
5.7 KiB
Bash
Executable File
#!/bin/bash
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set -e
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if ! id classroom >/dev/null 2>&1; then
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adduser \
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--disabled-password \
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--gecos "" \
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classroom
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fi
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# The session is started by SDDM now. An upgrade from a sway-era room has
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# to remove the login shell that used to start it, or the machine has two
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# things trying to own tty1.
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rm -f /home/classroom/.bash_profile
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rm -f /etc/systemd/system/[email protected]/autologin.conf
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rmdir --ignore-fail-on-non-empty \
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/etc/systemd/system/[email protected] 2>/dev/null || true
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# Commands the room's own parts install. Listing them by name went wrong
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# once already, when a command that had been removed was still chmod'ed
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# here and the whole postinst failed; the package is the list.
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for command in /usr/local/bin/classroom-*; do
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[ -e "$command" ] || continue
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chmod 0755 "$command"
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done
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# Reading the optical drive needs group cdrom. Takes effect at the next
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# login, which the OTA reboot provides.
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if getent group cdrom >/dev/null 2>&1; then
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adduser classroom cdrom >/dev/null 2>&1 || true
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fi
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# Create device.conf on a new endpoint, or append only settings an older
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# endpoint does not yet know. The helper preserves every existing byte apart
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# from the append, so per-room choices always survive an upgrade.
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PYTHONPATH=/usr/local/lib/ekklesia-classroom python3 - <<'PY'
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from classroom_config import ensure_device_config
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ensure_device_config()
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PY
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# The broker password lives here, so the file stops being world readable.
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# Everything that reads it runs as root or as the classroom user.
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chown root:classroom /etc/ekklesia-classroom/device.conf 2>/dev/null || true
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chmod 0640 /etc/ekklesia-classroom/device.conf
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systemctl daemon-reload || true
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# The power button stops working immediately rather than at the next
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# boot. Verified in the lab: logind re-reads its drop-ins on reload and
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# reports ignore afterwards, and the running graphical session is not
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# disturbed by it.
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systemctl reload systemd-logind >/dev/null 2>&1 || true
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# Autologin into the classroom, and back into it if the session ever ends.
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systemctl enable sddm.service >/dev/null 2>&1 || true
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# The room's own user services: the audio policy, and the drop-in that stops
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# Plasma giving up on a repeatedly crashing panel.
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systemctl --global enable ekklesia-classroom-audio.service >/dev/null 2>&1 || true
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systemctl --global enable ekklesia-classroom-desktop.service >/dev/null 2>&1 || true
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# Match the bar to this machine now, so the first login already has the
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# right one rather than waiting for the next provisioning run.
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/usr/local/bin/classroom-desktop-layout >/dev/null 2>&1 || true
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# NetworkManager ships nmtui and deliberately leaves interfaces declared in
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# /etc/network/interfaces under ifupdown's control (managed=false). This gives
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# administrators saved, auto-reconnecting Wi-Fi without taking over an
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# existing static Ethernet setup. No classroom service needs to hold boot for
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# NetworkManager's online wait, so keep that waiter disabled.
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systemctl enable NetworkManager.service || true
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systemctl disable NetworkManager-wait-online.service || true
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systemctl start NetworkManager.service || true
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# CUPS is ready at boot, but no queue is created until an administrator runs
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# classroom-printer-setup. cups-browsed is unnecessary here and would expose
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# every advertised printer on the church network if installed independently.
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systemctl enable cups.socket cups.service || true
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systemctl disable --now cups-browsed.service || true
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# Direct DNS-SD destinations still appear through Avahi even when
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# cups-browsed is inactive. Nothing else in this appliance uses Avahi, so stop
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# both activation paths and keep unrelated church printers out of print lists.
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systemctl disable --now avahi-daemon.socket avahi-daemon.service || true
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systemctl mask avahi-daemon.socket avahi-daemon.service || true
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systemctl start cups.socket || true
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systemctl enable ekklesia-classroom-update.timer || true
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systemctl start ekklesia-classroom-update.timer || true
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# Google Chrome, and the DVD codecs when the room has a drive, are
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# fetched by the provisioning service at the next boot.
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#
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# Deliberately enabled but not started here. It cannot run during this
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# script anyway, because dpkg holds the apt lock throughout. Starting it
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# straight afterwards would race the reboot that an OTA update performs
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# the moment this install finishes, and an apt run killed by that reboot
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# leaves dpkg half-configured. Every OTA reboots, so waiting for the next
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# boot costs nothing and cannot corrupt anything.
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#
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# Provisioning is still enabled at boot so machines that were offline or
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# interrupted get another chance automatically.
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systemctl enable ekklesia-classroom-provision.service || true
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# Also schedule provisioning after this package installation completes.
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# Do not start it synchronously from postinst: dpkg/apt still owns its locks.
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# A short delayed systemd job lets the outer apt transaction finish first.
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#
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# If an OTA reboot happens before this fires, the normal enabled boot service
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# handles provisioning on the next boot instead.
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systemd-run \
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--unit=ekklesia-classroom-provision-after-install \
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--on-active=15s \
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--property=Type=oneshot \
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/bin/systemctl start ekklesia-classroom-provision.service \
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>/dev/null 2>&1 || true
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# Gives Chrome a chance to close properly on reboot, so its profile is
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# not marked as crashed. Best effort: it must never hold a shutdown up.
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systemctl enable ekklesia-classroom-shutdown.service || true
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# The room's link to the church broker. Enabled always; it does nothing
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# at all until a broker is configured in device.conf.
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systemctl enable ekklesia-classroom-mqtt.service || true
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systemctl restart ekklesia-classroom-mqtt.service || true
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systemctl start ekklesia-classroom-shutdown.service || true
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exit 0
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