Container Machines (macOS)

// Container Machine workflow — run these in Terminal on macOS 26
// Requires: https://github.com/apple/container (open-source CLI tool)

// 1. Create a new container machine named "dev" and set it as default
//    container machine create dev --default --image alpine

// 2. Run a quick command inside the machine
//    container machine run uname   // prints: Linux

// 3. Start an interactive shell — your macOS username + working directory
//    are automatically available inside the machine
//    container machine run          // launches interactive bash/sh

// 4. List all container machines (name, IP, resources)
//    container machine list

// ──────────────────────────────────────────────────────────────
// Swift: Vapor-style server configured to bind to the container
// machine's external IP so Safari on macOS can reach it.
// Package.swift target: .executableTarget(name: "Server", dependencies: [...])

import Foundation
#if canImport(Glibc)
import Glibc
#endif

// Resolve the container machine's IP at launch via environment variable
// Set CONTAINER_HOST_IP when invoking: CONTAINER_HOST_IP=192.168.64.5 swift run
let hostname: String
if let envIP = ProcessInfo.processInfo.environment["CONTAINER_HOST_IP"],
   !envIP.isEmpty {
    hostname = envIP
} else {
    hostname = "127.0.0.1" // fallback for local macOS testing
}

let port = 8080
print("[Server] Binding to \(hostname):\(port)")

// Minimal POSIX TCP listener to illustrate the binding concept
let sock = socket(AF_INET, Int32(SOCK_STREAM.rawValue), 0)
guard sock >= 0 else { fatalError("socket() failed") }

var addr = sockaddr_in()
addr.sin_family = sa_family_t(AF_INET)
addr.sin_port = in_port_t(port).bigEndian
addr.sin_addr = in_addr(s_addr: inet_addr(hostname))

withUnsafePointer(to: &addr) { ptr in
    ptr.withMemoryRebound(to: sockaddr.self, capacity: 1) { saddr in
        let result = bind(sock, saddr, socklen_t(MemoryLayout<sockaddr_in>.size))
        if result == 0 {
            print("[Server] Bound successfully — accessible from macOS Safari at http://\(hostname):\(port)")
        } else {
            print("[Server] bind() failed: \(String(cString: strerror(errno)))")
        }
    }
}
close(sock)