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fix(install): only a running desktop stops the install; detect desktops by metapackage (#781)

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* fix(install): detect desktops by their metapackages, not name prefixes

The Lite check matched any installed package starting with gnome/kde/
xfce/lxde, so standalone parts (gnome-keyring, xfce4-terminal,
lxde-icon-theme) rejected a Lite system. Match whole names of desktop
metapackages and session managers instead.

Also catch desktops the prefixes missed: Raspberry Pi OS Trixie replaced
raspberrypi-ui-mods with rpd-wayland-core / rpd-x-core, Debian tasksel
desktops (task-*-desktop), and multi-arch names (plasma-workspace:arm64).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VZNWFWprcFYGfuf1JAyrBJ

* docs(common): list espn_payload in the common README

#749 added src/common/espn_payload.py without a summary row or section,
so test_common_readme_lists_every_module fails on main.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VZNWFWprcFYGfuf1JAyrBJ
(cherry picked from commit 8333f23e5c)

* fix(install): only a running desktop stops the install

A desktop costs the panel CPU only while it runs, so a running display
manager (checked with systemctl is-active, including the generic
display-manager alias, instead of a grep -q pipe under pipefail) still
stops the installer. Desktop packages or session files on a Pi that boots
to the console now print a warning and the install continues.

Adds installer OS-check tests for running, installed-only and Lite
systems, including the libblockdev and gnome-keyring false positives.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VZNWFWprcFYGfuf1JAyrBJ

---------

Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Chuck
2026-10-06 13:35:49 -04:00
committed by GitHub
co-authored by Claude Opus 5.5
parent 87f255b2fa
commit d98b479727
3 changed files with 94 additions and 27 deletions
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docs/TROUBLESHOOTING.md
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@@ -101,7 +101,10 @@ python3 --version
Imager, choosing Raspberry Pi OS Lite (64-bit). Trixie is recommended;
Bookworm (Legacy) also works. An in-place upgrade from Bullseye is not
supported by Raspberry Pi and is not worth the risk.
- "Desktop environment detected": use the Lite image, not the desktop one.
- "A desktop is running": use the Lite image, not the desktop one, or boot
to the console with `sudo systemctl set-default multi-user.target` and
reboot. Desktop packages that are installed but not running only produce a
warning, and the install continues.
- "python3 is Python 3.x; LEDMatrix needs Python 3.11 or newer": something
has replaced the system `python3`. Point it back at the OS's own Python
(`/usr/bin/python3` should be 3.11 on Bookworm, 3.13 on Trixie).