Where to Find Apple Container Tool Source Code on GitHub

The Apple container tool source code is publicly available at github.com/apple/container, with the Swift Package Manager project organized under the Sources/ directory and the CLI entry point located in Sources/CLI/ContainerCLI.swift.

The Apple container tool is an open-source Swift project maintained by Apple that provides a lightweight container runtime for macOS. If you are looking for the complete source code for Apple's container tool, you will find it hosted on GitHub under the Apple organization. The repository contains everything needed to build the command-line interface, runtime services, and supporting libraries according to the Swift Package Manager structure defined in Package.swift.

GitHub Repository Location

All source code for the Apple container tool resides in the official GitHub repository:

https://github.com/apple/container

This repository contains the complete Swift Package Manager project. The Package.swift manifest defines modular libraries including ContainerCommands, ContainerBuild, ContainerAPIClient, and ContainerRuntimeLinuxServer, each implementing distinct functional layers of the container system.

Source Code Architecture

The project follows a modular architecture with all implementation files stored under the Sources/ directory. Each library lives in its own folder, separating concerns between the command-line interface, runtime, and auxiliary services.

CLI Entry Point

The entry point for the container binary is the ContainerCLI struct defined in Sources/CLI/ContainerCLI.swift. This file carries the @main attribute, which invokes Application.main() to parse sub-commands, validate configuration, and dispatch execution to the appropriate service handlers.

Command Implementations

High-level sub-commands such as run, build, and push are implemented in the ContainerCommands library. For example:

• Sources/ContainerCommands/System/Start.swift handles the system start sub-command.
• Sources/ContainerCommands/Build/BuildCommand.swift implements the build command.
• Sources/ContainerCommands/Run/RunCommand.swift contains the run command logic.

Linux Runtime Service

The low-level Linux VM runtime used on Apple silicon is provided by the ContainerRuntimeLinuxServer library. The core runtime logic that launches lightweight VMs is implemented in Sources/Services/RuntimeLinux/Server/RuntimeService.swift.

Supporting Services

Additional libraries under Sources/ handle specific concerns:

• Sources/Services/Network/ - Manages port forwarding, VMnet networking, and DNS services.
• Sources/ContainerPersistence/ - Reads and writes configuration files such as container.toml, with the loader implemented in ConfigurationLoader.swift.
• Sources/ContainerXPC/ - Provides inter-process communication between the daemon and client processes.
• Sources/ContainerLog/ - Implements unified logging using OSLog, file, and stderr outputs.
• Sources/ContainerVersion/ - Embeds build-time version information into the binary.
• Sources/ContainerBuild/Builder.swift - Orchestrates the image build pipeline.

Building and Running from Source

After cloning the repository, you can build the container binary using Swift Package Manager. The following commands demonstrate how the source code maps to CLI functionality:

Start the System Daemon

container system start

This command invokes the implementation in Sources/ContainerCommands/System/Start.swift, which initializes the background daemon that manages containers.

Build a Container Image

container build -t myimage:latest .

The build command is defined in Sources/ContainerCommands/Build/BuildCommand.swift and calls the ContainerBuild library, specifically Sources/ContainerBuild/Builder.swift, to orchestrate the build pipeline.

Run a Container

container run -p 8080:80 myimage:latest

This sub-command is implemented in Sources/ContainerCommands/Run/RunCommand.swift and ultimately invokes ContainerRuntimeLinuxServer to launch a lightweight VM via RuntimeService.swift.

Using the Swift API Client

You can interact with the container service programmatically using the ContainerAPIClient library:

import ContainerAPIClient

let client = try ContainerAPIClient()
let containers = try await client.list()
print("Running containers:", containers)

The Swift client API is declared in Sources/Services/ContainerAPIService/Client/ContainerAPIClient.swift.

Documentation and Technical References

Beyond the source code, the repository includes comprehensive documentation:

• README.md - High-level project introduction, installation steps, and basic usage.
• docs/technical-overview.md - Architectural overview explaining how the container system components interact.
• docs/command-reference.md - Complete reference for all CLI commands and available flags.
• BUILDING.md - Instructions for compiling the project from source.

Summary

• The Apple container tool source code is hosted at github.com/apple/container as an open-source Swift project.
• The entry point is Sources/CLI/ContainerCLI.swift, which uses the @main attribute to launch the application.
• Source files are organized under Sources/ into libraries including ContainerCommands, ContainerBuild, ContainerRuntimeLinuxServer, and ContainerPersistence.
• Key implementation files include RuntimeService.swift for Linux VM management and Builder.swift for image construction.
• Documentation is available in docs/technical-overview.md and docs/command-reference.md.

Frequently Asked Questions

Is Apple's container tool open source?

Yes, Apple's container tool is fully open source and available under the Apple organization on GitHub. The repository includes the complete Swift source code, build instructions, and documentation, allowing developers to inspect, build, and modify the tool.

What programming language is the Apple container tool written in?

The entire codebase is written in Swift. The project uses Swift Package Manager for dependency management and building, with the CLI entry point utilizing Swift's @main attribute and async/await patterns for concurrency.

Where is the entry point for the container command located?

The entry point is defined in Sources/CLI/ContainerCLI.swift. This file contains the ContainerCLI struct marked with @main, which calls Application.main() to parse command-line arguments and dispatch to the appropriate sub-command handlers in the ContainerCommands library.

How do I build the container tool from source?

Clone the repository from github.com/apple/container and use Swift Package Manager to build the project. The BUILDING.md file in the repository root provides specific instructions for compiling the binary and installing dependencies. Once built, the container binary can be invoked directly from the command line.

{
  "mcpServers": {
    "instagit": {
      "command": "npx",
      "args": ["-y", "instagit@latest"]
    }
  }
}