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refactor update backend to host-managed PDC pipeline

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lincube
2026-04-20 12:55:19 +08:00
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.trae/specs/pdc-incremental-migration/spec.md
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## Goal
Replace VeloPack-based incremental packaging with a unified signed FileMap pipeline and prepare for PDC/S3 distribution compatibility, while keeping Launcher installation, rollback, and update orchestration ownership unchanged.
Replace VeloPack-based incremental packaging with a unified PDC FileMap + object-repo pipeline, while keeping Launcher installation, rollback, and update orchestration ownership unchanged.
## Stage 1 (Completed in this round)
## Stage 1 (Completed)
- Release workflow outputs signed FileMap incremental assets as the primary path:
- `files-windows-x64.json` / `.sig` / `update-windows-x64.zip`
- `files-windows-x86.json` / `.sig` / `update-windows-x86.zip`
- `files-linux-x64.json` / `.sig` / `update-linux-x64.zip`
- Launcher and host update runtime remove VeloPack branches and return to signed FileMap apply path.
- Host update asset discovery supports platform-scoped names with fallback to legacy generic names.
- Optional S3 sync publishes incremental assets in parallel with GitHub Release assets.
- Release workflow removed VeloPack-based release packaging.
- Signed FileMap path was restored as an interim release mechanism.
- Host/Launcher fallback behavior stayed compatible with `files.json + files.json.sig + update.zip`.
## Stage 2 (In Progress)
## Stage 2 (Current Implementation Target)
- Introduce PDC-compatible update source (`pdc`) with fallback to GitHub.
- Add PDC metadata/latest/distribution API consumption abstraction.
- Keep Launcher install/apply/rollback state machine unchanged.
- Prepare `phainon.yml`-compatible release metadata for future PDCC integration.
- Move release publishing to PDCC + `phainon.yml` (ClassIsland-style).
- Promote PDC-distributed FileMap/object-repo as the primary incremental path.
- Keep GitHub Release installers and metadata as parallel distribution.
- Keep Launcher state machine ownership (`.current/.partial/.destroy` + snapshots).
- Update source defaults to `stcn` (S3/PDC), with GitHub fallback.
- S3 object root is fixed to `lanmountain/update/` with no update-system version prefix.
Expected S3 layout:
- `lanmountain/update/repo/<hash-prefix>/<hash-object>`
- `lanmountain/update/meta/channels/<channel>/<subchannel>/latest.json`
- `lanmountain/update/meta/distributions/<distributionId>/*.json`
- `lanmountain/update/installers/<platform>/<arch>/*`
## Acceptance
- `release.yml` no longer contains VeloPack packaging steps.
- Windows x64/x86 and Linux x64 release jobs all upload signed FileMap incremental assets.
- Host auto-update can detect and download platform-matching signed FileMap assets.
- Launcher `update apply` succeeds with signed FileMap payload and rollback behavior remains unchanged.
- Optional S3 upload step works when S3 secrets/vars are configured.
- `release.yml` includes PDCC publish steps and no Velopack steps.
- Release jobs keep building installers for Windows x64/x86, Linux x64, and macOS.
- PDC metadata + FileMap + object repo are published under `lanmountain/update/`.
- Host can consume PDC payload (`stcn` source) and fallback to GitHub when unavailable.
- Launcher can apply both:
- legacy signed `files.json + update.zip`
- PDC FileMap object-repo payload.
- Rollback semantics remain unchanged.
## Deprecated Notes
- The following interim outputs are compatibility-only (not the long-term primary path):
- `files-windows-x64.json` / `.sig` / `update-windows-x64.zip`
- `files-windows-x86.json` / `.sig` / `update-windows-x86.zip`
- `files-linux-x64.json` / `.sig` / `update-linux-x64.zip`