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dsh-omp-native — native PDF and SQLite sidecar for DeepSeek Harness

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Standalone native sidecar extracted from the oh-my-pi Rust rewrite (omp², MIT). It gives the DeepSeek Harness two bounded, read-only capabilities that were previously "Rust-dependent" in the omp backlog — now delivered as one small, statically linked binary the harness calls over a pinned JSON CLI contract:

• pdf — page rasterization to PNG via the pure-Rust [hayro] (https://crates.io/crates/hayro) renderer, with the same input/page/pixel/ output bounds the omp2 read tool enforces (20 MiB in, 2000 pages, 1.5M pixels, 8 MiB out).
• sqlite — read-only querying of SQLite databases with the full oh-my-pi table/column target syntax (db.sqlite, db.sqlite:users, db.sqlite:users?where=...&limit=..., raw ?q=SELECT ...), built on rusqlite with SQLITE_OPEN_READ_ONLY + progress interrupts and WAL support.

Identity	Value
Package	dsh-omp-native — a Rust crate (version 0.1.2-rc.1), not an npm package
Plugin id	none — no Cordis row; the harness finds the binary via DSH_OMP_NATIVE_PATH or the default target/release/dsh-omp-native probe
Seam	the pinned JSON CLI contract (docs/cli-contract.md), consumed by the hy-sde fork's read tool (packages/fs/tool-fs/src/read-native.ts)

Based on oh-my-pi (omp²) — src/pdf.rs and src/sqlite.rs are ported from the omp² crates/tools/src/read/ modules (MIT, © 2025-2026 Can Bölük and contributors). See THIRD-PARTY-NOTICES.md.

Why

PDF rasterization and SQLite querying were "Rust-dependent" items in the omp backlog: the harness had no way to get them without adopting Rust into its own build. This sidecar delivers both as one small, statically linked binary over a pinned JSON CLI contract — bounded, read-only, and versioned independently of the harness checkout.

The harness consumer is packages/fs/tool-fs/src/read-native.ts in the hy-sde deepseek-harness fork: the read tool routes .pdf/.sqlite files to this binary when present, sniffing the magic bytes first, and falls back to the regular read otherwise. Published here standalone so the sidecar builds and versions independently of the harness checkout.

Prerequisites

• Rust stable with edition 2024 support — install via rustup; the crate is edition = "2024" and builds on the stable channel (no nightly feature is used);
• cargo on PATH (comes with rustup);
• the consumer: the hy-sde fork's read tool (tool-fs), which probes the binary — nothing else is required; there is no npm/Node dependency.

Layout

dsh-omp-native/
  Cargo.toml            standalone crate (edition 2024, stable channel)
  src/main.rs           JSON contract entry
  src/pdf.rs            ported from omp2 crates/tools/src/read/pdf.rs
  src/sqlite.rs         ported from omp2 crates/tools/src/read/sqlite.rs (+ own tests)
  docs/cli-contract.md  pinned external contract
  fixtures/            sample.sqlite + sample.pdf used by the tool-fs spec

Build

cargo build --release          # stable channel is sufficient (no nightly)
cargo test --release           # sqlite module unit tests

Then either export DSH_OMP_NATIVE_PATH=/abs/path/to/dsh-omp-native at harness-runtime, or leave the binary at target/release/dsh-omp-native (the default probe in the fork's read-native.ts).

Uninstall / teardown

Unwiring is env-level: remove the DSH_OMP_NATIVE_PATH export from the harness environment (or delete target/release/dsh-omp-native, the default probe location). The read tool then falls back to the regular read for .pdf/.sqlite files — absence is always safe. cargo clean (or deleting target/) removes the build artifacts and the binary.

Provenance

• src/pdf.rs — omp² crates/tools/src/read/pdf.rs (MIT), omp_core::Str replaced by &'static str.
• src/sqlite.rs — omp² crates/tools/src/read/sqlite.rs (MIT), xutf width calls replaced by unicode-width so the crate builds on stable (omp²'s own workspace pins nightly for its xutf).
• Any further capability harvested from omp² should keep the same pattern: bounded read-only surface, own subcommand, JSON contract, magic-byte gating in the consumer.

License and attribution

This crate is licensed MIT — see LICENSE (© 2026 hy-sde). The pdf and sqlite modules are ported from the oh-my-pi Rust rewrite (omp², MIT License, © 2025-2026 Can Bölük and contributors); the upstream provenance is aggregated in THIRD-PARTY-NOTICES.md, which also records the crates.io ecosystem dependencies (hayro, rusqlite with bundled public-domain sqlite3, unicode-width, and the rest) under their own licenses. This is a separately built sidecar; the harness remains the property of its own project.