Fix build on non-macOS Apple platforms (#164)

Author: simonjbeaumont

Sources/NIOSSHServer/DataToBufferCodec.swift

@@ -12,6 +12,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if canImport(Foundation.Process)
+
 import Dispatch
 import Foundation
 import NIOCore
@@ -57,3 +59,5 @@ func createOutboundConnection(targetHost: String, targetPort: Int, loop: EventLo
         channel.eventLoop.makeSucceededFuture(())
     }.connect(host: targetHost, port: targetPort)
 }
+
+#endif // canImport(Foundation.Process)

Sources/NIOSSHServer/ExecHandler.swift

@@ -12,6 +12,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if canImport(Foundation.Process)
+
 import Dispatch
 import Foundation
 import NIOCore
@@ -156,3 +158,5 @@ final class ExampleExecHandler: ChannelDuplexHandler {
         }
     }
 }
+
+#endif // canImport(Foundation.Process)

Sources/NIOSSHServer/GlueHandler.swift

@@ -12,6 +12,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if canImport(Foundation.Process)
+
 import NIOCore
 
 final class GlueHandler {
@@ -122,3 +124,5 @@ extension GlueHandler: ChannelDuplexHandler {
         }
     }
 }
+
+#endif // canImport(Foundation.Process)

Sources/NIOSSHServer/RemotePortForwarding.swift

@@ -12,6 +12,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if canImport(Foundation.Process)
+
 import Dispatch
 import Foundation
 import NIOCore
@@ -97,3 +99,5 @@ final class RemotePortForwarderGlobalRequestDelegate: GlobalRequestDelegate {
         self.forwarder?.stopListening()
     }
 }
+
+#endif // canImport(Foundation.Process)

Sources/NIOSSHServer/main.swift

@@ -12,6 +12,8 @@
 //
 //===----------------------------------------------------------------------===//
 
+#if canImport(Foundation.Process)
+
 import Crypto
 import Dispatch
 import NIOCore
@@ -85,3 +87,9 @@ let channel = try bootstrap.bind(host: "0.0.0.0", port: 2222).wait()
 
 // Run forever
 try channel.closeFuture.wait()
+
+#else // canImport(Foundation.Process)
+
+fatalError("NIOSSHServer is only supported on platforms with Foundation.Process")
+
+#endif // !canImport(Foundation.Process)

Tests/NIOSSHTests/SSHConnectionStateMachineTests.swift

@@ -591,6 +591,7 @@ final class SSHConnectionStateMachineTests: XCTestCase {
         }
     }
 
+    @available(iOS 13.2, macOS 10.15, watchOS 6.1, tvOS 13.2, *)
     func testFirstBlockDecodedOnce() throws {
         let allocator = ByteBufferAllocator()
         let loop = EmbeddedEventLoop()

Tests/NIOSSHTests/SSHPackerSerializerTests.swift

@@ -243,6 +243,7 @@ final class SSHPacketSerializerTests: XCTestCase {
         }
     }
 
+    @available(iOS 13.2, macOS 10.15, watchOS 6.1, tvOS 13.2, *)
     func testSequencePreservedBetweenPlainAndCypher() {
         let message = SSHMessage.newKeys
         let allocator = ByteBufferAllocator()

Tests/NIOSSHTests/SSHPacketParserTests.swift

@@ -249,6 +249,7 @@ final class SSHPacketParserTests: XCTestCase {
         XCTAssertEqual(parser._discardableBytes, 0)
     }
 
+    @available(iOS 13.2, macOS 10.15, watchOS 6.1, tvOS 13.2, *)
     func testSequencePreservedBetweenPlainAndCypher() throws {
         let allocator = ByteBufferAllocator()
         var parser = SSHPacketParser(isServer: false, allocator: allocator)

Tests/NIOSSHTests/Utilities.swift

@@ -98,6 +98,7 @@ struct InsecureEncryptionAlgorithm {
     }
 }
 
+@available(iOS 13.2, macOS 10.15, watchOS 6.1, tvOS 13.2, *)
 class TestTransportProtection: NIOSSHTransportProtection {
     enum TestError: Error {
         case doubleDecode

Tests/NIOSSHTests/UtilitiesTests.swift

@@ -28,6 +28,7 @@ final class UtilitiesTests: XCTestCase {
         XCTAssertEqual(message, plaintext)
     }
 
+    @available(iOS 13.2, macOS 10.15, watchOS 6.1, tvOS 13.2, *)
     func testTestTransportProtection() throws {
         let inboundEncryptionKey = SymmetricKey(size: .bits128)
         let outboundEncryptionKey = SymmetricKey(size: .bits128)