Use SystemPackage for linux

Author: danielctull

Package.swift

@@ -13,6 +13,7 @@ let package = Package(
   dependencies: [
     .package(url: "https://github.com/apple/swift-algorithms.git", from: "1.2.0"),
     .package(url: "https://github.com/apple/swift-argument-parser.git", from: "1.6.0"),
+    .package(url: "https://github.com/apple/swift-system.git", from: "1.5.0"),
     .package(url: "https://github.com/swiftlang/swift-subprocess.git", branch: "main"),
     .package(url: "https://github.com/swiftlang/swift-syntax.git", from: "601.0.0"),
   ],
@@ -25,6 +26,7 @@ let package = Package(
         "MutationKit",
         "PackageKit",
         .product(name: "ArgumentParser", package: "swift-argument-parser"),
+        .product(name: "SystemPackage", package: "swift-system"),
       ]
     ),
 
@@ -86,13 +88,15 @@ let package = Package(
       name: "PackageKit",
       dependencies: [
         .product(name: "Subprocess", package: "swift-subprocess"),
+        .product(name: "SystemPackage", package: "swift-system"),
       ]
     ),
 
     .testTarget(
       name: "PackageKitTests",
       dependencies: [
-        "PackageKit"
+        "PackageKit",
+        .product(name: "SystemPackage", package: "swift-system"),
       ],
       resources: [
         .copy("TestPackages"),

Sources/MutationTesting/MutationTesting.swift

@@ -3,7 +3,12 @@ import CoreMutation
 import Foundation
 import MutationKit
 import PackageKit
-import System
+
+#if canImport(System)
+@preconcurrency import System
+#else
+@preconcurrency import SystemPackage
+#endif
 
 @main
 struct MutationTesting: AsyncParsableCommand {

Sources/PackageKit/Package.swift

@@ -1,6 +1,11 @@
 import Foundation
 import Subprocess
-import System
+
+#if canImport(System)
+@preconcurrency import System
+#else
+@preconcurrency import SystemPackage
+#endif
 
 public struct Package: Equatable, Hashable {
   public let name: Name

Sources/PackageKit/Source.swift

@@ -1,5 +1,10 @@
 import Foundation
-import System
+
+#if canImport(System)
+@preconcurrency import System
+#else
+@preconcurrency import SystemPackage
+#endif
 
 public struct Source: Equatable, Hashable, Sendable {
   public let name: Name

Sources/PackageKit/Target.swift

@@ -1,4 +1,8 @@
-import System
+#if canImport(System)
+@preconcurrency import System
+#else
+@preconcurrency import SystemPackage
+#endif
 
 public struct Target: Equatable, Hashable {
   public let name: Name

Tests/PackageKitTests/FileManagerTests.swift

@@ -1,8 +1,13 @@
 import Foundation
 @testable import PackageKit
-import System
 import Testing
 
+#if canImport(System)
+@preconcurrency import System
+#else
+@preconcurrency import SystemPackage
+#endif
+
 @Suite("FileManager")
 struct FileManagerTests {
 

Tests/PackageKitTests/Helpers/Package.Path+TestPackages.swift

@@ -1,8 +1,13 @@
 import Foundation
 @testable import PackageKit
-import System
 import Testing
 
+#if canImport(System)
+@preconcurrency import System
+#else
+@preconcurrency import SystemPackage
+#endif
+
 extension Package.Path {
 
   init(test: Package.Name) throws {

Tests/PackageKitTests/PackageTests.swift

@@ -1,8 +1,13 @@
 import Foundation
 @testable import PackageKit
-import System
 import Testing
 
+#if canImport(System)
+@preconcurrency import System
+#else
+@preconcurrency import SystemPackage
+#endif
+
 @Suite("Package")
 struct PackageTests {