arm64 was the last image in the household whose identity was typed in by hand
after building — Raspberry Pi Imager's OS Customisation dialog set the hostname
per unit at flash time. That's the exact step CoreSystemConfig.json exists to
remove, and it failed quietly when mistyped: spotify-connect-start reads
$(hostname) at service start, so a typo doesn't error, it just puts a Spotify
Connect device with the wrong room name in the picker.
The builder now substitutes the endpoint's hostname from the audio_endpoints
array into a generated copy of config/audio-endpoint.yaml and builds one image
per room, published like every other image as
iso-out/smarthome-<hostname>-<pairid>.img. The substitution is targeted rather
than a YAML round-trip: that template is mostly comments explaining an
unverified schema, and a load/dump would strip every one of them. It fails loudly
if it doesn't match exactly once, rather than shipping an image named after the
wrong room.
The cost is honest and documented: one full rpi-image-gen run per arm64 room,
qemu-emulated on an x86 builder, instead of one for all of them.
build.arm64_prebake: false restores the single generic image for households with
several arm64 rooms and a slow builder. Wi-Fi and SSH keys are still set in
Imager on arm64 either way — only the hostname moved into the build.
Also fixes the image-publishing search, which used `find -newer $BUILD_CONFIG`
and silently found nothing when the build finished within the same filesystem
timestamp granularity as the config write. Newest .img wins instead.
Resolves the per-room-identity asymmetry in project-plan Phase 15.5.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Installation was six scripts each carrying its own copy of the container host's
IP, three that had to agree on IDENTITY_TOKEN, and every service URL typed by
hand with a port in it. Any one could be wrong, and the symptom was always the
same and always late: an image that boots fine and then can't reach something,
found after a 40-minute build and a reboot.
Two properties fix that class of bug:
- Nothing is written twice. No script in tools/ contains an IP, port or token.
- Anything derivable is derived. You give the subnet prefix once and one last
octet per host; every address and service URL is computed from those.
THE TWINNED PAIR. container_host.ip_last_octet 12 and llm_host 13 mean the
container host's OLLAMA_HOST *is* http://<prefix>.13:11434 — computed in the
same build, not typed into two files and kept in sync. Move the LLM host to .21
and the container host's Ollama URL follows; change the subnet and both halves
move along with every kiosk's URLs. Neither image can be built pointing at an
address the other isn't using. Both carry the same SMARTHOME_PAIR_ID (a hash of
the config's meaning, not its bytes) so two USB sticks can be checked against
each other later.
validate-config.py runs before every build and refuses to start on an error, so
a mistake costs seconds not an hour. It catches duplicate ports (including the
music_assistant/pantry_vision 8095 clash that Compose can't see because MA runs
network_mode:host — open decision #31), both hosts on one address, duplicate
hostnames across kiosks and audio endpoints, placeholder tokens (checked before
the length check, so padding "changeme" to 32 chars doesn't pass), a private key
pasted where the public one goes, and a kiosk pointed at a disabled service.
build-all.sh is the normal entry point — the images are a set that has to agree
with itself, so building one is the exception. It builds the core pair, every
kiosk, and every audio endpoint including both architectures (amd64 live-build
ISO and arm64 rpi-image-gen img are different toolchains, not one image).
The two new host ISOs install unattended with everything burnt in, including
service env files generated from derived values — which permanently removes the
class of bug that had chores.env shipping IDENTITY_URL=http://127.0.0.1:8097.
setup-container-host.sh and setup-llm-host.sh now read every config value as
${VAR:-default} so the images configure them without editing.
That also makes every ISO a credential: Wi-Fi PSK, tokens, MQTT and HA
credentials are readable by anyone holding the stick. .gitignore covers the
filled-in CoreSystemConfig.json and build-output/.
Tested: 43 config validation/derivation checks and 44 builder checks against the
real code paths with only `lb` stubbed — every generated env file, preseed,
network config, first-boot unit and build stamp is verified, including that a
port collision refuses the build before writing anything. No ISO has been built;
`lb build` needs live-build, root and a long fetch. tools/README.md says so.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Amir Alexander Abdelbaki