Files
Classroom_Desktop/packaging/debian/postinst
T
ekklesiaandClaude Opus 5 f7d5aecd6c build: make the classroom desktop something a .deb installs
Building the package found two things reading the tree did not.

dpkg refused it outright: plasma-workspace already owns
/etc/xdg/plasmanotifyrc and friends, and two packages cannot own one
path. The room's settings move to a directory of their own with
/etc/environment.d putting it in front of /etc/xdg, which is KConfig's
own cascade rather than a file fight.

The postinst then failed on a chmod for a command that no longer
exists. It now walks what the package installed instead of naming
files, removes the login shell that used to start sway on tty1, and
enables SDDM and the audio service.

Verified by installing the built package on a fresh machine and
starting the session from it: restrictions in force, palette applied,
audio service enabled and running, panel supervision unconditional.

Co-Authored-By: Claude Opus 5 <[email protected]>
2026-09-10 09:06:53 -05:00

118 lines
5.1 KiB
Bash
Executable File

#!/bin/bash
set -e
if ! id classroom >/dev/null 2>&1; then
adduser \
--disabled-password \
--gecos "" \
classroom
fi
# The session is started by SDDM now. An upgrade from a sway-era room has
# to remove the login shell that used to start it, or the machine has two
# things trying to own tty1.
rm -f /home/classroom/.bash_profile
rm -f /etc/systemd/system/[email protected]/autologin.conf
rmdir --ignore-fail-on-non-empty \
/etc/systemd/system/[email protected] 2>/dev/null || true
# Commands the room's own parts install. Listing them by name went wrong
# once already, when a command that had been removed was still chmod'ed
# here and the whole postinst failed; the package is the list.
for command in /usr/local/bin/classroom-*; do
[ -e "$command" ] || continue
chmod 0755 "$command"
done
# Reading the optical drive needs group cdrom. Takes effect at the next
# login, which the OTA reboot provides.
if getent group cdrom >/dev/null 2>&1; then
adduser classroom cdrom >/dev/null 2>&1 || true
fi
# Create device.conf on a new endpoint, or append only settings an older
# endpoint does not yet know. The helper preserves every existing byte apart
# from the append, so per-room choices always survive an upgrade.
PYTHONPATH=/usr/local/lib/ekklesia-classroom python3 - <<'PY'
from classroom_config import ensure_device_config
ensure_device_config()
PY
# The broker password lives here, so the file stops being world readable.
# Everything that reads it runs as root or as the classroom user.
chown root:classroom /etc/ekklesia-classroom/device.conf 2>/dev/null || true
chmod 0640 /etc/ekklesia-classroom/device.conf
systemctl daemon-reload || true
# Autologin into the classroom, and back into it if the session ever ends.
systemctl enable sddm.service >/dev/null 2>&1 || true
# The room's own user services: the audio policy, and the drop-in that stops
# Plasma giving up on a repeatedly crashing panel.
systemctl --global enable ekklesia-classroom-audio.service >/dev/null 2>&1 || true
# NetworkManager ships nmtui and deliberately leaves interfaces declared in
# /etc/network/interfaces under ifupdown's control (managed=false). This gives
# administrators saved, auto-reconnecting Wi-Fi without taking over an
# existing static Ethernet setup. No classroom service needs to hold boot for
# NetworkManager's online wait, so keep that waiter disabled.
systemctl enable NetworkManager.service || true
systemctl disable NetworkManager-wait-online.service || true
systemctl start NetworkManager.service || true
# CUPS is ready at boot, but no queue is created until an administrator runs
# classroom-printer-setup. cups-browsed is unnecessary here and would expose
# every advertised printer on the church network if installed independently.
systemctl enable cups.socket cups.service || true
systemctl disable --now cups-browsed.service || true
# Direct DNS-SD destinations still appear through Avahi even when
# cups-browsed is inactive. Nothing else in this appliance uses Avahi, so stop
# both activation paths and keep unrelated church printers out of print lists.
systemctl disable --now avahi-daemon.socket avahi-daemon.service || true
systemctl mask avahi-daemon.socket avahi-daemon.service || true
systemctl start cups.socket || true
systemctl enable ekklesia-classroom-update.timer || true
systemctl start ekklesia-classroom-update.timer || true
# Google Chrome, and the DVD codecs when the room has a drive, are
# fetched by the provisioning service at the next boot.
#
# Deliberately enabled but not started here. It cannot run during this
# script anyway, because dpkg holds the apt lock throughout. Starting it
# straight afterwards would race the reboot that an OTA update performs
# the moment this install finishes, and an apt run killed by that reboot
# leaves dpkg half-configured. Every OTA reboots, so waiting for the next
# boot costs nothing and cannot corrupt anything.
#
# Provisioning is still enabled at boot so machines that were offline or
# interrupted get another chance automatically.
systemctl enable ekklesia-classroom-provision.service || true
# Also schedule provisioning after this package installation completes.
# Do not start it synchronously from postinst: dpkg/apt still owns its locks.
# A short delayed systemd job lets the outer apt transaction finish first.
#
# If an OTA reboot happens before this fires, the normal enabled boot service
# handles provisioning on the next boot instead.
systemd-run \
--unit=ekklesia-classroom-provision-after-install \
--on-active=15s \
--property=Type=oneshot \
/bin/systemctl start ekklesia-classroom-provision.service \
>/dev/null 2>&1 || true
# Gives Chrome a chance to close properly on reboot, so its profile is
# not marked as crashed. Best effort: it must never hold a shutdown up.
systemctl enable ekklesia-classroom-shutdown.service || true
# The room's link to the church broker. Enabled always; it does nothing
# at all until a broker is configured in device.conf.
systemctl enable ekklesia-classroom-mqtt.service || true
systemctl restart ekklesia-classroom-mqtt.service || true
systemctl start ekklesia-classroom-shutdown.service || true
exit 0