BetterFrame/deploy/rauc/build-bundle.sh
Mitchell R 3575f1169b
feat(os-ota): A/B image repartition + bigger Blacksmith binary runners
Phase 2a of OS OTA: post-process pi-gen output into a RAUC-compatible
A/B layout. New deploy/rauc/repartition-image.sh:

- Decompresses the stock pi-gen 2-partition image
- Extracts bootfs (vfat) + rootfs (ext4) blobs
- Compacts rootfs with resize2fs -M and grows back with 25% headroom
- Patches /etc/fstab inside rootfs to use LABEL=BF_BOOT_A /
  LABEL=BF_ROOT_A / LABEL=BF_DATA (slot-agnostic; RAUC re-labels per
  slot on install)
- Stamps /etc/betterframe/{os-version,os-compatibility} for the kiosk's
  os_update.rs to read at runtime
- Builds two bootfs copies, each with cmdline.txt root= rewritten to
  the matching ROOT slot
- Lays out 6 GPT partitions: BF_BOOTSEL (autoboot.txt with tryboot
  pointing at boot_partition=2 / [tryboot] boot_partition=3), BF_BOOT_A,
  BF_BOOT_B, BF_ROOT_A (populated), BF_ROOT_B (empty, RAUC fills on
  first install), BF_DATA
- Recompresses with xz -T0

build-bundle.sh now takes the already-extracted slot images so the
.raucb bundle re-uses the exact same blobs that ship inside the A/B
initial-flash image — no duplication, no drift.

CI wires the repartition step between pi-gen output and the GitHub
Release upload. Ships the A/B image (not the stock pi-gen one).

Also: bump Blacksmith binary builders from 2/4 vCPU to 8 vCPU each.
Image job stays on GitHub's ubuntu-24.04-arm (Blacksmith arm kernel
6.5 doesn't ship binfmt_misc as a loadable module, which pi-gen-action's
defensive modprobe step still requires).

What's still pending:
  - In-image RAUC install (rauc package + drop system.conf + CA cert
    at /etc/rauc/keyring.pem). Without this, the image boots A/B-laid-
    out but rauc install commands have no daemon to talk to.
  - Admin UI for OS releases + rollouts (task #4).
2026-05-21 10:57:00 +02:00

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#!/usr/bin/env bash
# Build a signed RAUC .raucb bundle from pre-extracted slot images.
#
# The repartition-image.sh script (run earlier in CI) already extracts
# rootfs.ext4 + bootfs.vfat from the pi-gen output, so this script just
# stages them with a rendered manifest + runs `rauc bundle`.
#
# Usage:
# build-bundle.sh <rootfs.ext4> <bootfs.vfat> <out.raucb> \
# <version> <git_sha> <signing_cert.pem> <signing_key.pem>
set -euo pipefail
ROOTFS_IN="${1:?rootfs.ext4 path required}"
BOOTFS_IN="${2:?bootfs.vfat path required}"
OUT_RAUCB="${3:?output .raucb path required}"
VERSION="${4:?version required}"
GIT_SHA="${5:?git sha required}"
SIGNING_CERT="${6:?signing cert path required}"
SIGNING_KEY="${7:?signing key path required}"
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
MANIFEST_IN="${SCRIPT_DIR}/manifest.raucm.in"
WORK_DIR="$(mktemp -d)"
trap 'rm -rf "$WORK_DIR"' EXIT
STAGE="${WORK_DIR}/bundle"
mkdir -p "$STAGE"
cp "$ROOTFS_IN" "${STAGE}/rootfs.ext4"
cp "$BOOTFS_IN" "${STAGE}/bootfs.vfat"
echo "==> Rendering manifest"
sed -e "s|@VERSION@|${VERSION}|g" \
-e "s|@GIT_SHA@|${GIT_SHA}|g" \
"$MANIFEST_IN" > "${STAGE}/manifest.raucm"
ls -la "$STAGE"
cat "${STAGE}/manifest.raucm"
echo "==> Building RAUC bundle"
rm -f "$OUT_RAUCB"
rauc bundle \
--cert="$SIGNING_CERT" \
--key="$SIGNING_KEY" \
"$STAGE" "$OUT_RAUCB"
echo "==> Verifying bundle"
rauc info --keyring="$SIGNING_CERT" "$OUT_RAUCB"
echo
echo "==> Bundle: $(ls -la "$OUT_RAUCB")"