Remove the support for CURRENT_SDK (#251)

This PR removes the no longer needed support for `CURRENT_SDK`.

Sources/CLI/Application.swift

@@ -302,9 +302,6 @@ extension Application {
         #if DEBUG
         versionDetails["build"] = "debug"
         #endif
-        #if CURRENT_SDK
-        versionDetails["sdk"] = "macOS 15"
-        #endif
         let gitCommit = {
             let sha = get_git_commit().map { String(cString: $0) }
             guard let sha else {

Sources/Helpers/NetworkVmnet/NetworkVmnetHelper.swift

@@ -105,15 +105,11 @@ extension NetworkVmnetHelper {
         }
 
         private static func createNetwork(configuration: NetworkConfiguration, log: Logger) throws -> Network {
-            guard #available(macOS 16, *) else {
+            guard #available(macOS 26, *) else {
                 return try AllocationOnlyVmnetNetwork(configuration: configuration, log: log)
             }
 
-            #if !CURRENT_SDK
             return try ReservedVmnetNetwork(configuration: configuration, log: log)
-            #else
-            return try AllocationOnlyVmnetNetwork(configuration: configuration, log: log)
-            #endif
         }
     }
 

Sources/Helpers/RuntimeLinux/NonisolatedInterfaceStrategy.swift

@@ -23,7 +23,6 @@ import Logging
 import Virtualization
 import vmnet
 
-#if !CURRENT_SDK
 /// Interface strategy for containers that use macOS's custom network feature.
 @available(macOS 26, *)
 struct NonisolatedInterfaceStrategy: InterfaceStrategy {
@@ -47,4 +46,3 @@ struct NonisolatedInterfaceStrategy: InterfaceStrategy {
         return NATNetworkInterface(address: attachment.address, gateway: attachment.gateway, reference: networkRef)
     }
 }
-#endif

Sources/Helpers/RuntimeLinux/RuntimeLinuxHelper.swift

@@ -63,15 +63,11 @@ struct RuntimeLinuxHelper: AsyncParsableCommand {
 
             log.info("configuring XPC server")
             let interfaceStrategy: any InterfaceStrategy
-            #if !CURRENT_SDK
             if #available(macOS 26, *) {
                 interfaceStrategy = NonisolatedInterfaceStrategy(log: log)
             } else {
                 interfaceStrategy = IsolatedInterfaceStrategy()
             }
-            #else
-            interfaceStrategy = IsolatedInterfaceStrategy()
-            #endif
             let server = SandboxService(root: .init(fileURLWithPath: root), interfaceStrategy: interfaceStrategy, log: log)
             let xpc = XPCServer(
                 identifier: machServiceLabel,

Sources/Services/ContainerNetworkService/ReservedVmnetNetwork.swift

@@ -26,9 +26,8 @@ import SystemConfiguration
 import XPC
 import vmnet
 
-#if !CURRENT_SDK
 /// Creates a vmnet network with reservation APIs.
-@available(macOS 16, *)
+@available(macOS 26, *)
 public final class ReservedVmnetNetwork: Network {
     @SendableProperty
     private var _state: NetworkState
@@ -61,7 +60,7 @@ public final class ReservedVmnetNetwork: Network {
     }
 
     public nonisolated func withAdditionalData(_ handler: (XPCMessage?) throws -> Void) throws {
-        try networkLock.lock {
+        try networkLock.withLock {
             try handler(network.map { try Self.serialize_network_ref(ref: $0) })
         }
     }
@@ -149,14 +148,3 @@ public final class ReservedVmnetNetwork: Network {
         )
     }
 }
-
-extension NSLock {
-    /// lock during the execution of the provided function
-    fileprivate func lock<T>(_ fn: () throws -> T) rethrows -> T {
-        self.lock()
-        defer { self.unlock() }
-
-        return try fn()
-    }
-}
-#endif