Run prettier on all relevant files
This commit is contained in:
Claudio Ortolina
@@ -1,9 +1,10 @@
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---
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id: doc-10
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title: 'Deepseek v4 Pro, xhigh analysis'
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title: "Deepseek v4 Pro, xhigh analysis"
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type: other
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created_date: '2026-05-04 15:11'
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created_date: "2026-05-04 15:11"
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---
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# Nerves Deployment Feasibility Analysis for Music Library
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> Research report — do not implement. May 2026.
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@@ -29,26 +30,26 @@ steps.
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## 1. Native-extensions audit
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Every dependency that ships a NIF or binary artefact was reviewed for ARM /
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Nerves compatibility. Dev‑only tools (esbuild, tailwind, credo, etc.) are
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Nerves compatibility. Dev‑only tools (esbuild, tailwind, credo, etc.) are
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excluded — they never reach the firmware.
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| Dependency | Purpose | NIF type | Precompiled ARM? | Nerves feasibility |
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|---|---|---|---|---|
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| **exqlite** → `ecto_sqlite3` | SQLite driver | C NIF (`cc_precompiler`) | ✅ `aarch64-linux-gnu/musl` (no `armv7-*`) | **🟢 Good** — `force_build: true` compiles from source inside the Nerves toolchain. Explicitly mentioned in Exqlite’s README as an embedded use-case. |
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| **vix** → libvips | Image processing (covers, thumbnails) | C NIF (`elixir_make`) | ❌ No ARM binaries advertised | **🔴 High risk** — libvips is ~30 MB with transitive deps (libjpeg, libpng, libwebp, etc.). Each needs Buildroot integration or cross‑compilation. Biggest blocker for a lean firmware. |
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| **mdex** → comrak + ammonia | Markdown → HTML | Rust NIF (RustlerPrecompiled) | ⚠️ Standard Rustler targets (`aarch64-unknown-linux-gnu`, possibly `arm-*`) | **🟡 Needs cross‑compilation** — RustlerPrecompiled targets use different triples than Nerves (`aarch64-nerves-linux-gnu`). Precompiled `.so` likely won’t load. Cross‑compile from source with a Nerves‑aware Rust toolchain. |
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| **lumis** → tree‑sitter | Syntax highlighting (in mdex) | Rust NIF (RustlerPrecompiled) | Same as mdex | **🟡 Same situation** — part of the mdex stack. Tree‑sitter grammars add per‑language compilation but the NIF itself is manageable. |
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| **typst** | PDF generation (tracklists) | Rust NIF (RustlerPrecompiled) | Same as mdex | **🔴 Heavy** — a full typesetting engine. Large binary, plus the same target‑triple mismatch. Likely overkill for embedded PDFs. |
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| **dominant_colors** → kmeans_colors | Colour extraction from covers | Rust NIF (`rustler_precompiled ~> 0.7`) | Same as mdex | **🟢 Small** — trivial NIF. Cross‑compilation is straightforward. Low risk. |
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| **esbuild** | JS bundling | Go binary | — | **N/A** — dev only, never deployed. |
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| **tailwind** | CSS generation | Go binary | — | **N/A** — dev only, never deployed. |
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| Dependency | Purpose | NIF type | Precompiled ARM? | Nerves feasibility |
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| ----------------------------------- | ------------------------------------- | --------------------------------------- | --------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
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| **exqlite** → `ecto_sqlite3` | SQLite driver | C NIF (`cc_precompiler`) | ✅ `aarch64-linux-gnu/musl` (no `armv7-*`) | **🟢 Good** — `force_build: true` compiles from source inside the Nerves toolchain. Explicitly mentioned in Exqlite’s README as an embedded use-case. |
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| **vix** → libvips | Image processing (covers, thumbnails) | C NIF (`elixir_make`) | ❌ No ARM binaries advertised | **🔴 High risk** — libvips is ~30 MB with transitive deps (libjpeg, libpng, libwebp, etc.). Each needs Buildroot integration or cross‑compilation. Biggest blocker for a lean firmware. |
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| **mdex** → comrak + ammonia | Markdown → HTML | Rust NIF (RustlerPrecompiled) | ⚠️ Standard Rustler targets (`aarch64-unknown-linux-gnu`, possibly `arm-*`) | **🟡 Needs cross‑compilation** — RustlerPrecompiled targets use different triples than Nerves (`aarch64-nerves-linux-gnu`). Precompiled `.so` likely won’t load. Cross‑compile from source with a Nerves‑aware Rust toolchain. |
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| **lumis** → tree‑sitter | Syntax highlighting (in mdex) | Rust NIF (RustlerPrecompiled) | Same as mdex | **🟡 Same situation** — part of the mdex stack. Tree‑sitter grammars add per‑language compilation but the NIF itself is manageable. |
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| **typst** | PDF generation (tracklists) | Rust NIF (RustlerPrecompiled) | Same as mdex | **🔴 Heavy** — a full typesetting engine. Large binary, plus the same target‑triple mismatch. Likely overkill for embedded PDFs. |
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| **dominant_colors** → kmeans_colors | Colour extraction from covers | Rust NIF (`rustler_precompiled ~> 0.7`) | Same as mdex | **🟢 Small** — trivial NIF. Cross‑compilation is straightforward. Low risk. |
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| **esbuild** | JS bundling | Go binary | — | **N/A** — dev only, never deployed. |
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| **tailwind** | CSS generation | Go binary | — | **N/A** — dev only, never deployed. |
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### Target‑architecture specifics
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| Target | CPU | Nerves toolchain triple | Precompiled‑binary match? |
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|---|---|---|---|
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| RPi 4 / 5 | Cortex‑A72 / A76 (64‑bit) | `aarch64-nerves-linux-gnu` | ⚠️ `aarch64-linux-gnu` *may* be ABI‑compatible (exqlite). Rust NIFs need rebuild. |
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| RPi 3 | Cortex‑A53 (32‑bit) | `armv7-nerves-linux-gnueabihf` | ❌ No precompiled binaries match. Everything must be compiled from source. |
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| Target | CPU | Nerves toolchain triple | Precompiled‑binary match? |
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| --------- | ------------------------- | ------------------------------ | --------------------------------------------------------------------------------- |
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| RPi 4 / 5 | Cortex‑A72 / A76 (64‑bit) | `aarch64-nerves-linux-gnu` | ⚠️ `aarch64-linux-gnu` _may_ be ABI‑compatible (exqlite). Rust NIFs need rebuild. |
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| RPi 3 | Cortex‑A53 (32‑bit) | `armv7-nerves-linux-gnueabihf` | ❌ No precompiled binaries match. Everything must be compiled from source. |
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**Recommendation**: Target RPi 4 or 5 (64‑bit) first — the precompiled ecosystem is
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far better and the 32‑bit path adds unnecessary friction.
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@@ -60,10 +61,10 @@ far better and the 32‑bit path adds unnecessary friction.
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The application loads two run‑time extensions via Exqlite’s `load_extensions`
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config:
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| Extension | Source | ARM status | Notes |
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|---|---|---|---|
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| **vec0** | [sqlite-vec](https://github.com/asg017/sqlite-vec) | ✅ **Good** | “Written in pure C, no dependencies, runs anywhere SQLite runs (… Raspberry Pis, etc.)” — explicitly tested on ARM. Compilable for any Nerves target. |
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| **unicode** | likely [sqlean](https://github.com/nalgeon/sqlean) (`text` module or bundle) | ✅ **ARM64 available** | Sqlean ships `sqlean-linux-arm64.zip`. For ARMv7, compile from C source. |
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| Extension | Source | ARM status | Notes |
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| ----------- | ---------------------------------------------------------------------------- | ---------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------- |
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| **vec0** | [sqlite-vec](https://github.com/asg017/sqlite-vec) | ✅ **Good** | “Written in pure C, no dependencies, runs anywhere SQLite runs (… Raspberry Pis, etc.)” — explicitly tested on ARM. Compilable for any Nerves target. |
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| **unicode** | likely [sqlean](https://github.com/nalgeon/sqlean) (`text` module or bundle) | ✅ **ARM64 available** | Sqlean ships `sqlean-linux-arm64.zip`. For ARMv7, compile from C source. |
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### Loading mechanism
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@@ -79,7 +80,7 @@ cross‑compiler, place them in the appropriate arch subdirectory, and Exqlite w
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load them at connection time.
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**Unknown**: Whether the `unicode` extension is built from the exact same sqlean
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release as production, or compiled independently. Sync the build flags and version
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release as production, or compiled independently. Sync the build flags and version
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to avoid subtle behavioural differences.
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---
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@@ -90,13 +91,13 @@ This is the **hardest problem** and the most architecturally open of the three.
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### What Litestream does (and doesn’t)
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| Capability | Litestream | Needed for device ↔ cloud sync |
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|---|---|---|
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| Unidirectional backup (app → S3) | ✅ | ❌ |
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| Disaster recovery (restore from S3) | ✅ | ❌ |
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| Bidirectional sync | ❌ | ✅ |
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| Conflict detection / resolution | ❌ | ✅ |
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| Multi‑writer support | ❌ | ✅ |
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| Capability | Litestream | Needed for device ↔ cloud sync |
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| ----------------------------------- | ---------- | ------------------------------ |
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| Unidirectional backup (app → S3) | ✅ | ❌ |
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| Disaster recovery (restore from S3) | ✅ | ❌ |
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| Bidirectional sync | ❌ | ✅ |
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| Conflict detection / resolution | ❌ | ✅ |
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| Multi‑writer support | ❌ | ✅ |
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Litestream is purely an asynchronous backup tool. It continuously streams WAL pages
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to S3. It has **no mechanism** for a second instance to push writes back, no merge
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@@ -141,7 +142,7 @@ Never write the same record type from both sides:
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- **Production server**: records, embeddings, notes, record sets, artist info.
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- **Nerves device**: scrobbles, listening stats, playback logs.
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- Each instance has its own SQLite database. They sync via API calls (e.g., device
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- Each instance has its own SQLite database. They sync via API calls (e.g., device
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pushes scrobbles to production, production pushes new records to device).
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- **Pros**: No database‑level conflicts. Clear ownership boundaries.
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@@ -184,24 +185,24 @@ Define a custom sync protocol with:
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Even with a sync strategy in place, Litestream could still run on the Nerves device
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for **local disaster recovery** — streaming the device’s own WAL to a separate S3
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path. This is independent from the production Litestream instance.
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path. This is independent from the production Litestream instance.
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---
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## Summary of risks
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| Risk | Severity | Mitigation |
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|---|---|---|
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| **vix / libvips on Nerves** | 🔴 High | Replace image processing with a lighter alternative, or offload to the production server via API. |
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| **Data‑sync strategy** | 🔴 High | No off‑the‑shelf solution. Start with read‑only replica (option A), iterate toward separate write domains (option B). |
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| **typst on embedded** | 🟡 Medium | Switch to server‑side PDF generation; client downloads the result. |
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| **Rust NIF cross‑compilation** | 🟡 Medium | Set up Nerves Rust cross‑compilation. Works but adds build complexity. Each library needs individual testing. |
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| **ARMv7 (RPi 3) vs AArch64 (RPi 4/5)** | 🟡 Medium | RPi 4/5 (64‑bit) has much better precompiled‑binary support. RPi 3 requires everything compiled from source. |
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| **Buildroot package deps (libvips)** | 🟡 Medium | Each transitive C library needs a Buildroot package definition or a custom cross‑compile step. |
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| **Firmware size** | 🟡 Medium | libvips + typst + sqlite extensions → image could exceed 200 MB. Typical Nerves firmware is 20–80 MB. |
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| **sqlite‑vec on ARM** | 🟢 Low | Explicitly supported. Pure C, no deps. Compiles trivially with the Nerves toolchain. |
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| **exqlite on Nerves** | 🟢 Low | Designed for embedded use. Source compilation well‑supported and documented. |
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| **dominant\_colors** | 🟢 Low | Tiny Rust NIF. Straightforward cross‑compilation. |
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| Risk | Severity | Mitigation |
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| -------------------------------------- | --------- | --------------------------------------------------------------------------------------------------------------------- |
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| **vix / libvips on Nerves** | 🔴 High | Replace image processing with a lighter alternative, or offload to the production server via API. |
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| **Data‑sync strategy** | 🔴 High | No off‑the‑shelf solution. Start with read‑only replica (option A), iterate toward separate write domains (option B). |
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| **typst on embedded** | 🟡 Medium | Switch to server‑side PDF generation; client downloads the result. |
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| **Rust NIF cross‑compilation** | 🟡 Medium | Set up Nerves Rust cross‑compilation. Works but adds build complexity. Each library needs individual testing. |
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| **ARMv7 (RPi 3) vs AArch64 (RPi 4/5)** | 🟡 Medium | RPi 4/5 (64‑bit) has much better precompiled‑binary support. RPi 3 requires everything compiled from source. |
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| **Buildroot package deps (libvips)** | 🟡 Medium | Each transitive C library needs a Buildroot package definition or a custom cross‑compile step. |
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| **Firmware size** | 🟡 Medium | libvips + typst + sqlite extensions → image could exceed 200 MB. Typical Nerves firmware is 20–80 MB. |
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| **sqlite‑vec on ARM** | 🟢 Low | Explicitly supported. Pure C, no deps. Compiles trivially with the Nerves toolchain. |
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| **exqlite on Nerves** | 🟢 Low | Designed for embedded use. Source compilation well‑supported and documented. |
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| **dominant_colors** | 🟢 Low | Tiny Rust NIF. Straightforward cross‑compilation. |
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---
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+16
-13
@@ -2,8 +2,9 @@
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id: doc-11
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title: Nerves Deployment Research — Consolidated Summary
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type: other
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created_date: '2026-05-04 15:25'
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created_date: "2026-05-04 15:25"
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---
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# Nerves Deployment Research — Consolidated Summary
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> Synthesized from three parallel research reports (Opus 4.7 xhigh, GPT 5.5 high, Deepseek v4 Pro xhigh) on 2026-05-04.
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@@ -113,6 +114,7 @@ Litestream is asynchronous backup and disaster recovery. It streams WAL pages to
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#### D. Offline-Capable Writes (Most Complex)
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Options if offline writes are required:
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- **Application-level outbox**: Local command log + idempotency keys + push to production on reconnect.
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- **CRDTs** (Automerge, Yjs): True offline-first, no Elixir/SQLite bridge exists.
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- **Event sourcing**: Append-only mutation log, replay to reconstruct state. Complex.
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@@ -149,18 +151,18 @@ Options if offline writes are required:
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## 5. Risk Summary
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| Risk | Severity | Mitigation |
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|---|---|---|
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| vix / libvips on Nerves | 🔴 High | Offload image processing to production API, or build custom Nerves system |
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| Data-sync strategy | 🔴 High | Start read-only, iterate toward write-through API |
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| typst on embedded | 🟡 Medium | Server-side PDF generation |
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| Rust NIF cross-compilation | 🟡 Medium | Set up Nerves Rust cross-compilation; test each library |
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| ARMv7 (RPi 3) vs AArch64 | 🟡 Medium | Target RPi 4/5 (64-bit) only |
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| Buildroot deps (libvips, ICU) | 🟡 Medium | Custom Nerves system; ~15-30 min Buildroot rebuild |
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| Firmware size | 🟡 Medium | libvips + typst + extensions could exceed 200 MB; set 120 MB budget |
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| sqlite-vec / unicode on ARM | 🟢 Low | Pure C, no deps. Cross-compile in Buildroot |
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| exqlite on Nerves | 🟢 Low | Designed for embedded; source compilation documented |
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| dominant_colors | 🟢 Low | Tiny Rust NIF, straightforward |
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| Risk | Severity | Mitigation |
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| ----------------------------- | --------- | ------------------------------------------------------------------------- |
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| vix / libvips on Nerves | 🔴 High | Offload image processing to production API, or build custom Nerves system |
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| Data-sync strategy | 🔴 High | Start read-only, iterate toward write-through API |
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| typst on embedded | 🟡 Medium | Server-side PDF generation |
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| Rust NIF cross-compilation | 🟡 Medium | Set up Nerves Rust cross-compilation; test each library |
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| ARMv7 (RPi 3) vs AArch64 | 🟡 Medium | Target RPi 4/5 (64-bit) only |
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| Buildroot deps (libvips, ICU) | 🟡 Medium | Custom Nerves system; ~15-30 min Buildroot rebuild |
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| Firmware size | 🟡 Medium | libvips + typst + extensions could exceed 200 MB; set 120 MB budget |
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| sqlite-vec / unicode on ARM | 🟢 Low | Pure C, no deps. Cross-compile in Buildroot |
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| exqlite on Nerves | 🟢 Low | Designed for embedded; source compilation documented |
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| dominant_colors | 🟢 Low | Tiny Rust NIF, straightforward |
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---
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@@ -188,6 +190,7 @@ All three reports collapse into a single question:
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## Sources
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All three reports include extensive source references. See individual documents for full citation lists:
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- `doc-8 - Opus-4.7-xhigh-analysis.md`
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- `doc-9 - GPT-5.5-high-analysis.md`
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- `doc-10 - Deepseek-v4-Pro-xhigh-analysis.md`
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@@ -1,29 +1,30 @@
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---
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id: doc-8
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title: 'Opus 4.7, xhigh analysis'
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title: "Opus 4.7, xhigh analysis"
|
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type: other
|
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created_date: '2026-05-04 15:08'
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updated_date: '2026-05-04 15:10'
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created_date: "2026-05-04 15:08"
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updated_date: "2026-05-04 15:10"
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---
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# Nerves Deployment Research — Findings
|
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Three parallel research agents covered NIFs, SQLite extensions, and Litestream replication semantics. The user's concerns were well-founded: there are real blockers, but most are solvable with custom Nerves system work. The Litestream question reframes the architecture more than expected.
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## 1. Native libraries (NIFs on aarch64-linux-musl)
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|
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| Library | aarch64-gnu | aarch64-musl | Status |
|
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|---|---|---|---|
|
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| `mdex` | ✅ | ✅ | Fine |
|
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| `lumis` | ✅ | ✅ | Fine |
|
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| `typst` | ✅ | ✅ | **Nerves-aware** — has `@nerves_rust_target_triple_mapping` in mix.exs |
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| `ecto_sqlite3` / `exqlite` | ✅ | ✅ | Driver fine; designed with embedded use in mind. Extensions are the issue (see §2) |
|
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| `dominant_colors` | likely | unknown | Verify GitHub releases; if missing, request musl target from maintainer |
|
||||
| `vix` | partial | ❌ | **Major blocker** |
|
||||
| `cloak_ecto` | n/a | n/a | Pure Elixir + `:crypto` |
|
||||
| Library | aarch64-gnu | aarch64-musl | Status |
|
||||
| -------------------------- | ----------- | ------------ | ---------------------------------------------------------------------------------- |
|
||||
| `mdex` | ✅ | ✅ | Fine |
|
||||
| `lumis` | ✅ | ✅ | Fine |
|
||||
| `typst` | ✅ | ✅ | **Nerves-aware** — has `@nerves_rust_target_triple_mapping` in mix.exs |
|
||||
| `ecto_sqlite3` / `exqlite` | ✅ | ✅ | Driver fine; designed with embedded use in mind. Extensions are the issue (see §2) |
|
||||
| `dominant_colors` | likely | unknown | Verify GitHub releases; if missing, request musl target from maintainer |
|
||||
| `vix` | partial | ❌ | **Major blocker** |
|
||||
| `cloak_ecto` | n/a | n/a | Pure Elixir + `:crypto` |
|
||||
|
||||
**`vix` is the dominant blocker.** Two compounding issues:
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||||
|
||||
- It loads the NIF at *compile time* (macro-driven introspection), which breaks cross-compilation on stock Nerves systems. fhunleth (Nerves core) discussed this in a 2023 ElixirForum thread; the conclusion was "no easy Elixir-level fix."
|
||||
- It loads the NIF at _compile time_ (macro-driven introspection), which breaks cross-compilation on stock Nerves systems. fhunleth (Nerves core) discussed this in a 2023 ElixirForum thread; the conclusion was "no easy Elixir-level fix."
|
||||
- libvips itself is not in `nerves_system_rpi4` / `nerves_system_rpi5`. You'd need a **custom Nerves system** with `BR2_PACKAGE_LIBVIPS=y` in Buildroot, then `VIX_COMPILATION_MODE=PLATFORM_PROVIDED_LIBVIPS`.
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||||
This is doable (15–30 min Buildroot rebuild, well-documented) but it commits you to maintaining a custom Nerves system. That single decision affects everything downstream — once you're building custom systems, ICU and sqlite-vec become "while we're at it" additions.
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@@ -51,7 +52,7 @@ Both extensions are blockers on stock Nerves systems for the same root reason
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## 3. Litestream replication — this is the architectural pivot
|
||||
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||||
**Headline:** Litestream is *not* a multi-master replicator. It's a one-way backup tool. If the Nerves device writes locally, those writes are lost on the next restore — no conflict detection, no reconciliation, no merge.
|
||||
**Headline:** Litestream is _not_ a multi-master replicator. It's a one-way backup tool. If the Nerves device writes locally, those writes are lost on the next restore — no conflict detection, no reconciliation, no merge.
|
||||
|
||||
**Two viable replica modes today (both newer than the docs you may remember):**
|
||||
|
||||
@@ -83,6 +84,7 @@ The **biggest non-obvious unknown** is the Litestream architecture decision. Goi
|
||||
## Sources
|
||||
|
||||
### NIF / Phoenix-on-Nerves
|
||||
|
||||
- [Underjord: LiveView on Nerves](https://underjord.io/liveview-on-nerves.html)
|
||||
- [ElixirForum: Cross Compiling with NIF as compilation dependency (vix/Nerves thread)](https://elixirforum.com/t/cross-compiling-with-nif-as-compilation-dependency/59821)
|
||||
- [Nerves docs: Compiling Non-BEAM Code](https://hexdocs.pm/nerves/compiling-non-beam-code.html)
|
||||
@@ -96,6 +98,7 @@ The **biggest non-obvious unknown** is the Litestream architecture decision. Goi
|
||||
- [Customizing Your Nerves System](https://hexdocs.pm/nerves/customizing-systems.html)
|
||||
|
||||
### SQLite extensions
|
||||
|
||||
- [Releases · asg017/sqlite-vec](https://github.com/asg017/sqlite-vec/releases)
|
||||
- [Fix for musl compile PR #199 · asg017/sqlite-vec](https://github.com/asg017/sqlite-vec/pull/199)
|
||||
- [Build and install exqlite with sqlcipher into nerves rpi5 image — ElixirForum](https://elixirforum.com/t/build-and-install-exqlite-with-sqlcipher-into-nerves-rpi5-image/75089)
|
||||
@@ -105,6 +108,7 @@ The **biggest non-obvious unknown** is the Litestream architecture decision. Goi
|
||||
- [Advanced Configuration — Nerves](https://hexdocs.pm/nerves/advanced-configuration.html)
|
||||
|
||||
### Litestream
|
||||
|
||||
- [Live Read Replication — Litestream (tip)](https://tip.litestream.io/guides/read-replica/)
|
||||
- [VFS Read Replicas — Litestream](https://litestream.io/guides/vfs/)
|
||||
- [How it works — Litestream](https://litestream.io/how-it-works/)
|
||||
|
||||
@@ -1,9 +1,10 @@
|
||||
---
|
||||
id: doc-9
|
||||
title: 'GPT 5.5, high analysis'
|
||||
title: "GPT 5.5, high analysis"
|
||||
type: other
|
||||
created_date: '2026-05-04 15:11'
|
||||
created_date: "2026-05-04 15:11"
|
||||
---
|
||||
|
||||
# Nerves Deployment Research Report
|
||||
|
||||
Date: 2026-05-04
|
||||
|
||||
Reference in New Issue
Block a user