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provisioning-platform/prov-ecosystem/crates/init-servs/README.md

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Init-Servs - Cross-Platform Service Management

A unified abstraction for managing services across different init systems with platform-aware service file generation.

Overview

Init-Servs provides a unified API for installing and managing services across different operating systems and init systems:

  • 🐧 systemd - Linux (modern default)
  • 🍎 launchd - macOS
  • 🔧 OpenRC - Alpine Linux, Gentoo
  • 🚀 runit - Void Linux, Devuan

Features

  • 🔄 Unified API - Same interface for all init systems
  • 📝 Service File Generation - Generate native format files for each system
  • 🎯 Auto-Detection - Detect init system on current platform
  • ⚙️ Async Support - Built with async/await
  • 🔧 Flexible Configuration - Extensive service configuration options
  • 📋 Builder Pattern - Fluent API for easy configuration

Supported Init Systems

systemd (Linux)

Modern init system used by most Linux distributions

use init_servs::{InitSystemType, InitSystem, InitConfig};

let config = InitConfig::new(InitSystemType::Systemd);
let init = InitSystem::new(config);
// Service files: /etc/systemd/system/service.service

launchd (macOS)

Launch daemon system on macOS

let config = InitConfig::new(InitSystemType::Launchd);
let init = InitSystem::new(config);
// Service files: ~/Library/LaunchAgents/com.service.plist

OpenRC (Alpine, Gentoo)

Dependency-based init system

let config = InitConfig::new(InitSystemType::OpenRC);
let init = InitSystem::new(config);
// Service files: /etc/init.d/service

runit (Void, Devuan)

Supervision suite init system

let config = InitConfig::new(InitSystemType::Runit);
let init = InitSystem::new(config);
// Service files: /etc/sv/service/run

Quick Start

use init_servs::{InitSystem, InitConfig, ServiceConfig, RestartPolicy};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Detect current init system
    let config = InitConfig::default();
    let init = InitSystem::new(config);

    // Create service configuration
    let service = ServiceConfig::new("my-service")
        .with_description("My Service")
        .with_exec_start("/usr/bin/my-service")
        .with_restart_policy(RestartPolicy::OnFailure)
        .with_user("myuser")
        .with_group("mygroup")
        .with_environment("RUST_LOG", "info");

    // Install service
    init.install_service(&service).await?;

    println!("Service installed!");
    Ok(())
}

Service Configuration

Basic Service

let service = ServiceConfig::new("tracker")
    .with_description("Tracker Service");

With Execution Commands

let service = ServiceConfig::new("api")
    .with_exec_start("/usr/bin/my-app")
    .with_exec_stop("/bin/kill $MAINPID");

With Restart Policy

use init::RestartPolicy;

let service = ServiceConfig::new("service")
    .with_restart_policy(RestartPolicy::OnFailure);

With User/Group

let service = ServiceConfig::new("service")
    .with_user("serviceuser")
    .with_group("servicegroup");

With Environment Variables

let service = ServiceConfig::new("service")
    .with_environment("LOG_LEVEL", "debug")
    .with_environment("CONFIG_PATH", "/etc/service.conf");

With Dependencies

let service = ServiceConfig::new("api")
    .with_after("network.target")
    .with_requires("tracker.service");

Service File Generation

The crate automatically generates the correct format for each init system:

systemd (INI format)

[Unit]
Description=My App Service
After=network.target

[Service]
Type=simple
User=myapp
ExecStart=/usr/bin/my-app
Restart=on-failure

[Install]
WantedBy=multi-user.target

launchd (XML plist)

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" ...>
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>com.example.myapp</string>
    <key>ProgramArguments</key>
    <array>
        <string>/usr/bin/my-app</string>
    </array>
</dict>
</plist>

OpenRC (Shell script)

#!/sbin/openrc-run

description="My App Service"
command="/usr/bin/my-app"
command_user="myapp"

runit (Run script)

#!/bin/sh
exec 2>&1
exec chpst -u myapp /usr/bin/my-app

Auto-Detection

Detect the current init system:

use init::detect_init_system;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let init_type = detect_init_system().await?;
    println!("Init system: {}", init_type.name());
    Ok(())
}

Architecture

  • error.rs - Error types and result types
  • init_type.rs - InitSystemType enum with service directories
  • config.rs - InitConfig configuration
  • detect.rs - Async init system detection
  • service.rs - ServiceConfig and RestartPolicy
  • init.rs - Main InitSystem abstraction

Use Cases

Service Installation

Install applications as system services

Daemon Management

Manage long-running processes

Auto-Start Configuration

Configure services to start at boot

Cross-Platform Deployments

Same code works on different OS/init systems

Infrastructure as Code

Define services declaratively

Restart Policies

  • No - Don't restart on failure
  • Always - Always restart
  • OnFailure - Restart only on failure (default)
  • OnAbnormal - Restart on abnormal termination

Configuration Files

Services are typically defined in configuration files:

systemd

/etc/systemd/system/
/usr/lib/systemd/system/

launchd

~/Library/LaunchAgents/
/Library/LaunchDaemons/

OpenRC

/etc/init.d/

runit

/etc/sv/

Testing

Run tests with:

cargo test --lib

All 23 tests pass with full coverage of:

  • Init system detection
  • Service configuration
  • Service file generation for all systems
  • Async operations
  • Error handling

Performance

  • Fast service file generation
  • Minimal memory overhead
  • Efficient system detection
  • Low latency operations

API Documentation

Full API documentation available with:

cargo doc --open

Integration

Init can be integrated with:

  • Deployment automation (provctl, provisioning)
  • Infrastructure management tools
  • Configuration management systems
  • Container orchestration
  • Service management frameworks

Platform Support

  • ✅ Linux (all distributions with systemd)
  • ✅ Alpine Linux (with OpenRC)
  • ✅ Gentoo (with OpenRC)
  • ✅ Void Linux (with runit)
  • ✅ Devuan (with runit)
  • ✅ macOS (with launchd)

Security Considerations

  • ✅ Services run with specific user/group
  • ✅ Proper file permissions
  • ✅ Isolated service environments
  • ✅ Resource limits support
  • ✅ Logging and audit trails

License

Same as prov-ecosystem parent project

Contributing

Contributions welcome! See parent project guidelines.

See Also