Running Linux in a Virtual Machine

At a glance

Project structure

Source bundle/
├── LinuxVirtualMachine/
│   ├── main.swift
│   └── LinuxVirtualMachine.entitlements
├── Configuration/
│   └── SampleCode.xcconfig
└── LinuxVirtualMachine.xcodeproj/
    ├── .xcodesamplecode.plist
    └── project.pbxproj

Structure observations

• Architecturally prominent files are ranked from entry points and role-named declarations; resource-only paths are omitted.
• Primary languages: Swift.
• The verified tree contains 4 project/configuration file(s) and 1 source declaration(s).

Overall architecture

flowchart LR
    N1["Delegate"]
    N2["Virtualization APIs"]
    N1 --> N2

Reference code

LinuxVirtualMachine/main.swift:53 — architecture anchor

class Delegate: NSObject {
}

extension Delegate: VZVirtualMachineDelegate {
    func guestDidStop(_ virtualMachine: VZVirtualMachine) {
        print("The guest shut down. Exiting.")
        exit(EXIT_SUCCESS)
    }
}

Interpretation

The arrows summarize the source-visible entry, role-named types or folders, and framework direction; when nodes come from structural folders, the sequence is a high-level interpretation rather than proof that every adjacent node calls the next. Ownership is claimed only where the next section cites a stored property or assignment. The diagram is intentionally limited to the dominant path into Virtualization.

Ownership and state

classDiagram
    main *-- URL : kernelURL
    main *-- URL : initialRamdiskURL
    main *-- VZVirtualMachineConfiguration : configuration
    main *-- VZVirtualMachine : virtualMachine

Ownership evidence

LinuxVirtualMachine/main.swift:17 — stored dependency or nearest verified ownership anchor

let kernelURL = URL(fileURLWithPath: CommandLine.arguments[1], isDirectory: false)
let initialRamdiskURL = URL(fileURLWithPath: CommandLine.arguments[2], isDirectory: false)

// MARK: Create the Virtual Machine Configuration

let configuration = VZVirtualMachineConfiguration()
configuration.cpuCount = 2

Composition arrows indicate a source-visible construction expression or locally owned value state; aggregation means the owner stores or receives a dependency without proving exclusive lifetime ownership.

Class and protocol design

LinuxVirtualMachine/main.swift:53 — representative type boundary

class Delegate: NSObject {
}

No local protocol conformance is claimed as protocol-oriented design; external framework conformances are listed only as dependencies.

Access control

Reference code

LinuxVirtualMachine/main.swift:53 — representative boundary

class Delegate: NSObject {
}

Swift declarations without a modifier are internal; explicit private, fileprivate, private(set), public, or open entries above are interpreted by language semantics. Objective-C/C samples instead rely on header and implementation boundaries, which are not equivalent to Swift lexical privacy.

Logic ownership and placement

Design patterns

Naming conventions

• Types: Delegate: Delegate.
• Protocols: no local protocol declaration in the scanned source.
• Methods: guestDidStop, createBootLoader, createConsoleConfiguration, printUsageAndExit.
• Files: feature/project roles rather than a strict one-type-per-file rule.

Architecture takeaways

• Delegate is the main source-visible entry or composition anchor for this sample.
• Framework work reaches Virtualization through a deliberately small high-level chain; the detailed API graph remains inside the cited implementation files.
• Stored-property evidence identifies lifecycle collaboration; it does not by itself prove exclusive object ownership.
• Access-control conclusions separate verified language visibility from the likely design rationale.
• The source does not justify labeling the design protocol-oriented.

Source map

• Official Apple documentation