# Contributing to StartOS

This guide is for contributing to the StartOS. If you are interested in packaging a service for StartOS, visit the [service packaging guide](https://docs.start9.com/latest/packaging-guide/). If you are interested in promoting, providing technical support, creating tutorials, or helping in other ways, please visit the [Start9 website](https://start9.com/contribute).

## Collaboration

- [Matrix](https://matrix.to/#/#community-dev:matrix.start9labs.com)
- [Telegram](https://t.me/start9_labs/47471)

## Project Structure

```bash
/
├── assets/              # Screenshots for README
├── build/               # Auxiliary files and scripts for deployed images
├── container-runtime/   # Node.js program managing package containers
├── core/                # Rust backend: API, daemon (startd), CLI (start-cli)
├── debian/              # Debian package maintainer scripts
├── image-recipe/        # Scripts for building StartOS images
├── patch-db/            # (submodule) Diff-based data store for frontend sync
├── sdk/                 # TypeScript SDK for building StartOS packages
└── web/                 # Web UIs (Angular)
```

See component READMEs for details:
- [`core`](core/README.md)
- [`web`](web/README.md)
- [`build`](build/README.md)
- [`patch-db`](https://github.com/Start9Labs/patch-db)

## Environment Setup

```sh
git clone https://github.com/Start9Labs/start-os.git --recurse-submodules
cd start-os
```

### Development Mode

For faster iteration during development:

```sh
. ./devmode.sh
```

This sets `ENVIRONMENT=dev` and `GIT_BRANCH_AS_HASH=1` to prevent rebuilds on every commit.

## Building

This project uses [GNU Make](https://www.gnu.org/software/make/) to build its components.

### Requirements

- [GNU Make](https://www.gnu.org/software/make/)
- [Docker](https://docs.docker.com/get-docker/) or [Podman](https://podman.io/)
- [NodeJS v20.16.0](https://docs.npmjs.com/downloading-and-installing-node-js-and-npm)
- [Rust](https://rustup.rs/) (nightly for formatting)
- [sed](https://www.gnu.org/software/sed/), [grep](https://www.gnu.org/software/grep/), [awk](https://www.gnu.org/software/gawk/)
- [jq](https://jqlang.github.io/jq/)
- [gzip](https://www.gnu.org/software/gzip/), [brotli](https://github.com/google/brotli)

### Environment Variables

| Variable | Description |
|----------|-------------|
| `PLATFORM` | Target platform: `x86_64`, `x86_64-nonfree`, `aarch64`, `aarch64-nonfree`, `riscv64`, `raspberrypi` |
| `ENVIRONMENT` | Hyphen-separated feature flags (see below) |
| `PROFILE` | Build profile: `release` (default) or `dev` |
| `GIT_BRANCH_AS_HASH` | Set to `1` to use git branch name as version hash (avoids rebuilds) |

**ENVIRONMENT flags:**
- `dev` - Enables password SSH before setup, skips frontend compression
- `unstable` - Enables assertions and debugging with performance penalty
- `console` - Enables tokio-console for async debugging

**Platform notes:**
- `-nonfree` variants include proprietary firmware and drivers
- `raspberrypi` includes non-free components by necessity
- Platform is remembered between builds if not specified

### Make Targets

#### Building

| Target | Description |
|--------|-------------|
| `iso` | Create full `.iso` image (Debian only, not for raspberrypi) |
| `img` | Create full `.img` image (Debian only, raspberrypi only) |
| `deb` | Build Debian package |
| `all` | Build all Rust binaries |
| `uis` | Build all web UIs |
| `ui` | Build main UI only |
| `ts-bindings` | Generate TypeScript bindings from Rust types |

#### Deploying to Device

For devices on the same network:

| Target | Description |
|--------|-------------|
| `update-startbox REMOTE=start9@<ip>` | Deploy binary + UI only (fastest) |
| `update-deb REMOTE=start9@<ip>` | Deploy full Debian package |
| `update REMOTE=start9@<ip>` | OTA-style update |
| `reflash REMOTE=start9@<ip>` | Reflash as if using live ISO |
| `update-overlay REMOTE=start9@<ip>` | Deploy to in-memory overlay (reverts on reboot) |

For devices on different networks (uses [magic-wormhole](https://github.com/magic-wormhole/magic-wormhole)):

| Target | Description |
|--------|-------------|
| `wormhole` | Send startbox binary |
| `wormhole-deb` | Send Debian package |
| `wormhole-squashfs` | Send squashfs image |

#### Other

| Target | Description |
|--------|-------------|
| `format` | Run code formatting (Rust nightly required) |
| `test` | Run all automated tests |
| `test-core` | Run Rust tests |
| `test-sdk` | Run SDK tests |
| `test-container-runtime` | Run container runtime tests |
| `clean` | Delete all compiled artifacts |

## Testing

```bash
make test                    # All tests
make test-core               # Rust tests (via ./core/run-tests.sh)
make test-sdk                # SDK tests
make test-container-runtime  # Container runtime tests

# Run specific Rust test
cd core && cargo test <test_name> --features=test
```

## Code Formatting

```bash
# Rust (requires nightly)
make format

# TypeScript/HTML/SCSS (web)
cd web && npm run format
```

## Code Style Guidelines

### Formatting

Run the formatters before committing. Configuration is handled by `rustfmt.toml` (Rust) and prettier configs (TypeScript).

### Documentation & Comments

**Rust:**
- Add doc comments (`///`) to public APIs, structs, and non-obvious functions
- Use `//` comments sparingly for complex logic that isn't self-evident
- Prefer self-documenting code (clear naming, small functions) over comments

**TypeScript:**
- Document exported functions and complex types with JSDoc
- Keep comments focused on "why" rather than "what"

**General:**
- Don't add comments that just restate the code
- Update or remove comments when code changes
- TODOs should include context: `// TODO(username): reason`

### Commit Messages

Use [Conventional Commits](https://www.conventionalcommits.org/):

```
<type>(<scope>): <description>

[optional body]

[optional footer]
```

**Types:**
- `feat` - New feature
- `fix` - Bug fix
- `docs` - Documentation only
- `style` - Formatting, no code change
- `refactor` - Code change that neither fixes a bug nor adds a feature
- `test` - Adding or updating tests
- `chore` - Build process, dependencies, etc.

**Examples:**
```
feat(web): add dark mode toggle
fix(core): resolve race condition in service startup
docs: update CONTRIBUTING.md with style guidelines
refactor(sdk): simplify package validation logic
```