sysupgrade: variant-aware manifest URL + model-aware platform key (1.0.51)

[widgetii]

Summary

Phase 2 + Phase 3 of the mirror to OpenIPC/builder (companion plan: ~/.claude/plans/mirror-nightly-redesign-to-builder.md). Two coordinated changes in one PR because both surface in sysupgrade and the new rootfs_script.sh line is what makes them work together.

Phase 2 — variant-aware MANIFEST_URL

Static URL replaced with a runtime selector that mirrors the existing legacy-URL repo selector at download_firmware:

case "$osr" in lite|ultimate|neo) repo=firmware ;; esac

• lite/ultimate/neo cameras read https://openipc.github.io/firmware/manifest.flat.
• everything else (fpv, rubyfpv, apfpv, lte, venc, mini, …) reads https://openipc.github.io/builder/manifest.flat.
• Pre-redesign cameras (no BUILD_OPTION field) default to "lite" → firmware manifest (safest default — firmware is the larger ecosystem).
• Explicit MANIFEST_URL=... env override still wins.

Phase 3 — model-aware platform key

New BUILD_PLATFORM field emitted into /etc/os-release by general/scripts/rootfs_script.sh. Defaults to ${OPENIPC_SOC_MODEL}_${OPENIPC_VARIANT} (matches the existing coarse key for firmware-built rootfses), but accepts an env override — which OpenIPC/builder's master.yml (OpenIPC/builder#91) now exports as the matrix entry name (e.g. gk7205v200_fpv_caddx-fly).

sysupgrade --build=/--channel=/--list-builds lookups now prefer BUILD_PLATFORM over the computed ${soc}_${osr} when present, so a builder-built camera correctly filters its manifest to only its specific model — not all ~10 models sharing the same SoC+variant.

Backwards-compatible: cameras pre-dating BUILD_PLATFORM fall back to the coarse key. No flag day.

Verification

Routing simulated against synthetic /etc/os-release fragments:

BUILD_OPTION=fpv  → https://openipc.github.io/builder/manifest.flat
BUILD_OPTION=lite → https://openipc.github.io/firmware/manifest.flat

On-hardware verification after merge:

• openipc-hi3520dv200.dlab (lite) — sysupgrade --list-builds continues to query the firmware manifest, unchanged.
• openipc-gk7205v200.dlab (fpv) — sysupgrade --list-builds now queries the builder manifest. Expected: empty result until ci/nightly: SHA-gate cron, publish dated nightly-* releases, BUILD_ID env builder#91-Some eye-candy for README page. #93 produce the first dated nightly (next cron at 03:00 UTC).

Dependencies

OpenIPC/builder#91 (PR-Bld-A): exports BUILD_PLATFORM=$matrix.platform env, which is the source-of-truth for the rich platform key. Already merged.

scr_version

Bumped 1.0.50 → 1.0.51 so self_update() activates the new script the next time a lite/ultimate/neo camera runs sysupgrade -k -r.

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