oh-my-pi/docs/natives-build-release-debugging.md

Natives Build, Release, and Debugging Runbook

This runbook describes how the @oh-my-pi/pi-natives build pipeline produces .node addons, how compiled distributions load them, and how to debug loader/build failures.

It follows the architecture terms from docs/natives-architecture.md:

• build-time artifact production (scripts/build-native.ts)
• embedded addon manifest generation (scripts/embed-native.ts)
• runtime addon loading + validation gate (src/native.ts)

Implementation files

• packages/natives/scripts/build-native.ts
• packages/natives/scripts/embed-native.ts
• packages/natives/package.json
• packages/natives/src/native.ts
• crates/pi-natives/Cargo.toml

Build pipeline overview

1) Build entrypoints

packages/natives/package.json scripts:

• bun scripts/build-native.ts (build) → release build
• bun scripts/build-native.ts --dev (dev:native) → debug/dev profile build (same output naming)
• bun scripts/embed-native.ts (embed:native) → generate src/embedded-addon.ts from built files

2) Rust artifact build

build-native.ts runs Cargo in crates/pi-natives:

• base command: cargo build
• release mode adds --release unless --dev is passed
• cross target adds --target <CROSS_TARGET>

crates/pi-natives/Cargo.toml declares crate-type = ["cdylib"], so Cargo emits a shared library (.so/.dylib/.dll) that is then copied/renamed to a .node addon filename.

3) Artifact discovery and install

After Cargo completes, build-native.ts scans candidate output directories in order:

1. ${CARGO_TARGET_DIR} (if set)
2. <repo>/target
3. crates/pi-natives/target

For each root it checks profile directories:

• cross build: <root>/<crossTarget>/<profile> then <root>/<profile>
• native build: <root>/<profile>

Then it looks for one of:

• libpi_natives.so
• libpi_natives.dylib
• pi_natives.dll
• libpi_natives.dll

When found, it atomically installs into packages/natives/native/ with temp-file + rename semantics (Windows fallback handles locked DLL replacement failures explicitly).

Target/variant model and naming conventions

Platform tag

Both build and runtime use platform tag:

<platform>-<arch> (example: darwin-arm64, linux-x64)

Variant model (x64 only)

x64 supports CPU variants:

• modern (AVX2-capable path)
• baseline (fallback)

Non-x64 uses a single default artifact (no variant suffix).

Output filenames

Release builds:

• x64: pi_natives.<platform>-<arch>-modern.node or ...-baseline.node
• non-x64: pi_natives.<platform>-<arch>.node

Dev build (--dev):

• Uses debug profile flags but keeps standard platform-tagged output naming

Runtime loader candidate order in native.ts:

• release candidates
• compiled mode prepends extracted/cache candidates before package-local files

Environment flags and build options

Runtime flags

• PI_DEV (loader behavior): enable loader diagnostics
• PI_NATIVE_VARIANT (loader behavior, x64 only): force modern or baseline selection at runtime
• PI_COMPILED (loader behavior): enable compiled-binary candidate/extraction behavior

Build-time flags/options

• --dev (script arg): build debug profile
• CROSS_TARGET: passed to Cargo --target
• TARGET_PLATFORM: override output platform tag naming
• TARGET_ARCH: override output arch naming
• TARGET_VARIANT (x64 only): force modern or baseline for output filename and RUSTFLAGS policy
• CARGO_TARGET_DIR: additional root when searching Cargo outputs
• RUSTFLAGS:
  • if unset and not cross-compiling, script sets:
    • modern: -C target-cpu=x86-64-v3
    • baseline: -C target-cpu=x86-64-v2
    • non-x64 / no variant: -C target-cpu=native
  • if already set, script does not override

Build state/lifecycle transitions

Build lifecycle (build-native.ts)

1. Init: parse args/env (--dev, target overrides, cross flags)
2. Variant resolve:
   • non-x64 → no variant
   • x64 + TARGET_VARIANT → explicit variant
   • x64 cross-build without TARGET_VARIANT → hard error
   • x64 local build without override → detect host AVX2
3. Compile: run Cargo with resolved profile/target
4. Locate artifact: scan target roots/profile dirs/library names
5. Install: copy + atomic rename into packages/natives/native
6. Complete: output addon ready for loader candidates

Failure exits happen at any stage with explicit error text (invalid variant, failed cargo build, missing output library, install/rename failure).

Embed lifecycle (embed-native.ts)

1. Init: compute platform tag from TARGET_PLATFORM/TARGET_ARCH or host values
2. Candidate set:
   • x64 expects both modern and baseline
   • non-x64 expects one default file
3. Validate availability in packages/natives/native
4. Generate manifest (src/embedded-addon.ts) with Bun file imports and package version
5. Runtime extraction ready for compiled mode

--reset bypasses validation and writes a null manifest stub (embeddedAddon = null).

Dev workflow vs shipped/compiled behavior

Local development workflow

Typical local loop:

1. Build addon:
   • release: bun --cwd=packages/natives run build
   • debug profile: bun --cwd=packages/natives run dev:native
2. Set PI_DEV=1 when testing loader diagnostics
3. Loader in native.ts resolves package-local native/ (and executable-dir fallback) candidates
4. validateNative enforces export compatibility before wrappers use the binding

Shipped/compiled binary workflow

In compiled mode (PI_COMPILED or Bun embedded markers):

1. Loader computes versioned cache dir: <getNativesDir()>/<packageVersion> (operationally ~/.omp/natives/<version>)
2. If embedded manifest matches current platform+version, loader may extract selected embedded file into that versioned dir
3. Runtime candidate order includes:
   • versioned cache dir
   • legacy compiled-binary dir (%LOCALAPPDATA%/omp on Windows, ~/.local/bin elsewhere)
   • package/executable directories
4. First successfully loaded addon still must pass validateNative

This is why packaging + runtime loader expectations must align: filenames, platform tags, and exported symbols must match what native.ts probes and validates.

JS API ↔ Rust export mapping (validation gate subset)

native.ts requires these JS-visible exports to exist on the loaded addon. They map to Rust N-API exports in crates/pi-natives/src:

JS name required by validateNative	Rust export declaration	Rust source file
glob	#[napi] pub fn glob(...)	crates/pi-natives/src/glob.rs
grep	#[napi] pub fn grep(...)	crates/pi-natives/src/grep.rs
search	#[napi] pub fn search(...)	crates/pi-natives/src/grep.rs
highlightCode	#[napi] pub fn highlight_code(...)	crates/pi-natives/src/highlight.rs
getSystemInfo	#[napi] pub fn get_system_info(...)	crates/pi-natives/src/system_info.rs
getWorkProfile	#[napi] pub fn get_work_profile(...) (camel-cased export)	crates/pi-natives/src/prof.rs
invalidateFsScanCache	#[napi] pub fn invalidate_fs_scan_cache(...)	crates/pi-natives/src/fs_cache.rs

If any required symbol is missing, loader fails fast with a rebuild hint.

Failure behavior and diagnostics

Build-time failures

• Invalid variant configuration:
  • TARGET_VARIANT set on non-x64 → immediate error
  • x64 cross-build without explicit TARGET_VARIANT → immediate error
• Cargo build failure:
  • script surfaces non-zero exit and stderr
• Artifact not found:
  • script prints every checked profile directory
• Install failure:
  • explicit message; Windows includes locked-file hint

Runtime loader failures (native.ts)

• Unsupported platform tag:
  • throws with supported platform list
• No candidate could load:
  • throws with full candidate error list and mode-specific remediation hints
• Missing exports:
  • throws with exact missing symbol names and rebuild command
• Embedded extraction problems:
  • extraction mkdir/write errors recorded and included in final diagnostics

Troubleshooting matrix

Symptom	Likely cause	Verify	Fix
Native addon missing exports ... Missing: <name>	Stale .node binary, Rust export name mismatch, or wrong binary loaded	Run with PI_DEV=1 to see loaded path; inspect export list for that file	Rebuild build; ensure Rust #[napi] export name (or explicit alias when needed) matches JS key; remove stale cached/versioned files
x64 machine loads baseline when modern expected	PI_NATIVE_VARIANT=baseline, no AVX2 detected, or only baseline file present	Check PI_NATIVE_VARIANT; inspect native/ for -modern file	Build modern variant (TARGET_VARIANT=modern ... build) and ensure file is shipped
Cross-build produces unusable/wrong-labeled binary	Mismatch between CROSS_TARGET and TARGET_PLATFORM/TARGET_ARCH, or missing TARGET_VARIANT for x64	Confirm env tuple and output filename	Re-run with consistent env values and explicit x64 TARGET_VARIANT
Compiled binary fails after upgrade	Stale extracted cache (~/.omp/natives/<old-or-mismatched-version>) or embedded manifest mismatch	Inspect versioned natives dir and loader error list	Delete versioned natives cache for the package version and rerun; regenerate embedded manifest during packaging
Loader probes many paths and none work	Platform mismatch or missing release artifact in package native/	Check platformTag vs actual filename(s)	Ensure built filename exactly matches pi_natives.<platform>-<arch>(-variant).node convention and package includes native/
embed:native fails with "Incomplete native addons"	Required variant files not built before embedding	Check expected vs found list in error text	Build required files first (x64: both modern+baseline; non-x64: default), then rerun embed:native

Operational commands

# Release artifact for current host
bun --cwd=packages/natives run build

# Debug profile artifact build
bun --cwd=packages/natives run dev:native

# Build explicit x64 variants
TARGET_VARIANT=modern bun --cwd=packages/natives run build
TARGET_VARIANT=baseline bun --cwd=packages/natives run build

# Generate embedded addon manifest from built native files
bun --cwd=packages/natives run embed:native

# Reset embedded manifest to null stub
bun --cwd=packages/natives run embed:native -- --reset