Container Machines (Containerization Framework)

import Foundation

// MARK: - Container Machine Workflow (Swift scripting / shell integration)
// This demonstrates how to drive the `container` CLI from Swift using Process,
// mirroring the workflow shown in the WWDC session.

func runShellCommand(_ args: [String]) throws -> String {
    let process = Process()
    process.executableURL = URL(fileURLWithPath: "/usr/bin/env")
    process.arguments = args

    let pipe = Pipe()
    process.standardOutput = pipe
    process.standardError = pipe

    try process.run()
    process.waitUntilExit()

    let data = pipe.fileHandleForReading.readDataToEndOfFile()
    return String(decoding: data, as: UTF8.self).trimmingCharacters(in: .whitespacesAndNewlines)
}

// 1. Create a container machine named "dev" using the alpine OCI image
do {
    let createOutput = try runShellCommand([
        "container", "machine", "create",
        "--name", "dev",
        "--default",          // set as the default machine
        "alpine"              // any OCI-compatible image
    ])
    print("Created machine:\n\(createOutput)")
} catch {
    print("Create error: \(error)")
}

// 2. List all container machines (name, IP, resource info)
do {
    let listOutput = try runShellCommand(["container", "machine", "list"])
    print("Machines:\n\(listOutput)")
} catch {
    print("List error: \(error)")
}

// 3. Run a one-shot command — automatic user + cwd mirroring means
//    whoami and pwd return the same values as on the Mac host.
do {
    let whoami = try runShellCommand(["container", "machine", "run", "whoami"])
    print("Linux whoami: \(whoami)")   // e.g. "michael"

    let uname = try runShellCommand(["container", "machine", "run", "uname"])
    print("Linux uname: \(uname)")     // "Linux"
} catch {
    print("Run error: \(error)")
}

// 4. Build & run a Swift server package inside the machine.
//    Because the Mac filesystem is automatically shared, no file copying needed.
do {
    // swift build runs against the project in the shared working directory
    let build = try runShellCommand([
        "container", "machine", "run",
        "swift", "build", "-c", "release"
    ])
    print("Build output:\n\(build)")

    // Vapor must bind to the machine's IP so Safari on the Mac can reach it
    // The IP was captured from `container machine list` above
    let serve = try runShellCommand([
        "container", "machine", "run",
        ".build/release/App", "--hostname", "192.168.64.5", "--port", "8080"
    ])
    print("Server: \(serve)")
} catch {
    print("Build/run error: \(error)")
}