Fix building on Linux

Mist/Commands/Download/DownloadFirmwareCommand.swift

@@ -200,16 +200,25 @@ struct DownloadFirmwareCommand: ParsableCommand {
         let required: Int64 = firmware.size
 
         for url in [outputURL, temporaryURL] {
-            let values: URLResourceValues = try url.resourceValues(forKeys: [.volumeAvailableCapacityForImportantUsageKey, .volumeAvailableCapacityKey])
-            let free: Int64
+            var free: Int64 = 0
 
+#if os(Linux)
+            let values: URLResourceValues = try url.resourceValues(forKeys: [.volumeAvailableCapacityKey])
+            if let volumeAvailableCapacity: Int = values.volumeAvailableCapacity {
+                free = Int64(volumeAvailableCapacity)
+            }
+#else
+            let values: URLResourceValues = try url.resourceValues(forKeys: [.volumeAvailableCapacityForImportantUsageKey, .volumeAvailableCapacityKey])
             if
                 let volumeAvailableCapacityForImportantUsage: Int64 = values.volumeAvailableCapacityForImportantUsage,
                 volumeAvailableCapacityForImportantUsage > 0 {
                 free = volumeAvailableCapacityForImportantUsage
             } else if let volumeAvailableCapacity: Int = values.volumeAvailableCapacity {
                 free = Int64(volumeAvailableCapacity)
-            } else {
+            }
+#endif
+
+            if free == 0 {
                 throw MistError.notEnoughFreeSpace(volume: url.path, free: 0, required: required)
             }
 

Mist/Commands/Download/DownloadInstallerCommand.swift

@@ -397,16 +397,25 @@ struct DownloadInstallerCommand: ParsableCommand {
         for volume in volumes {
             let required: Int64 = installer.size * volume.count
             let url: URL = .init(fileURLWithPath: volume.path)
-            let values: URLResourceValues = try url.resourceValues(forKeys: [.volumeAvailableCapacityForImportantUsageKey, .volumeAvailableCapacityKey])
-            let free: Int64
+            var free: Int64 = 0
 
+#if os(Linux)
+            let values: URLResourceValues = try url.resourceValues(forKeys: [.volumeAvailableCapacityKey])
+            if let volumeAvailableCapacity: Int = values.volumeAvailableCapacity {
+                free = Int64(volumeAvailableCapacity)
+            }
+#else
+            let values: URLResourceValues = try url.resourceValues(forKeys: [.volumeAvailableCapacityForImportantUsageKey, .volumeAvailableCapacityKey])
             if
                 let volumeAvailableCapacityForImportantUsage: Int64 = values.volumeAvailableCapacityForImportantUsage,
                 volumeAvailableCapacityForImportantUsage > 0 {
                 free = volumeAvailableCapacityForImportantUsage
             } else if let volumeAvailableCapacity: Int = values.volumeAvailableCapacity {
                 free = Int64(volumeAvailableCapacity)
-            } else {
+            }
+#endif
+
+            if free == 0 {
                 throw MistError.notEnoughFreeSpace(volume: url.path, free: 0, required: required)
             }
 

Mist/Extensions/URL+Extension.swift

@@ -5,7 +5,7 @@
 //  Created by Nindi Gill on 15/8/2022.
 //
 
-import CryptoKit
+import Crypto
 import Foundation
 
 extension URL {

Mist/Helpers/Downloader.swift

@@ -7,6 +7,10 @@
 
 import Foundation
 
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
+
 /// Helper Class used to download macOS Firmwares and Installers.
 class Downloader: NSObject {
     private static let maximumWidth: Int = 95
@@ -70,12 +74,14 @@ class Downloader: NSObject {
 
         while urlError != nil {
             if retries >= options.retries {
+#if !os(Linux)
                 if
                     let error: URLError = urlError,
                     let data: Data = error.downloadTaskResumeData {
                     !quiet ? PrettyPrint.print("Saving resume data to '\(resumeDataURL.path)'...", noAnsi: noAnsi) : Mist.noop()
                     try data.write(to: resumeDataURL)
                 }
+#endif
 
                 throw MistError.maximumRetriesReached
             }
@@ -168,12 +174,14 @@ class Downloader: NSObject {
 
                 while urlError != nil {
                     if retries >= options.retries {
+#if !os(Linux)
                         if
                             let error: URLError = urlError,
                             let data: Data = error.downloadTaskResumeData {
                             !quiet ? PrettyPrint.print("Saving resume data to '\(resumeDataURL.path)'...", noAnsi: noAnsi) : Mist.noop()
                             try data.write(to: resumeDataURL)
                         }
+#endif
 
                         throw MistError.maximumRetriesReached
                     }
@@ -225,6 +233,9 @@ class Downloader: NSObject {
     }
 
     private func retry(attempt retry: Int, of maximumRetries: Int, with delay: Int, using session: URLSession) {
+#if os(Linux)
+        mistError = MistError.generalError("Cannot retry downloads on Linux")
+#else
         guard
             let urlError: URLError = urlError,
             let data: Data = urlError.downloadTaskResumeData else {
@@ -242,6 +253,7 @@ class Downloader: NSObject {
         updateProgress(replacing: false)
         task.resume()
         semaphore.wait()
+#endif
     }
 
     private func updateProgress(replacing: Bool = true) {

Mist/Helpers/Validator.swift

@@ -5,7 +5,7 @@
 //  Created by Nindi Gill on 29/4/2022.
 //
 
-import CryptoKit
+import Crypto
 import Foundation
 
 /// Helper Struct used to validate macOS Firmware and Installer downloads.

Mist/Model/Hardware.swift

@@ -49,6 +49,10 @@ enum Hardware {
     ///
     /// - Returns: The entity property for the provided key.
     private static func registryProperty(for key: String) -> String? {
+#if os(Linux)
+        // Cannot use Darwin/XNU kernel APIs on Linux
+        return nil;
+#else
         let entry: io_service_t = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("IOPlatformExpertDevice"))
 
         defer {
@@ -74,5 +78,6 @@ enum Hardware {
 
         let string: String = .init(decoding: data, as: UTF8.self)
         return string.trimmingCharacters(in: CharacterSet(["\0"]))
+#endif
     }
 }

Mist/main.swift

@@ -7,8 +7,23 @@
 
 import Foundation
 
+#if os(Linux)
+/// A shim for Linux that runs the given block of code.
+///
+/// The existence of this shim allows you the use of auto-release pools to optimize memory footprint on Darwin platforms while maintaining
+/// compatibility with Linux where this API is not implemented.
+@discardableResult
+public func autoreleasepool<Result>(_ block: () throws -> Result) rethrows -> Result {
+    return try block()
+}
+
+public func autoreleasepool<E, Result>(invoking body: () throws(E) -> Result) throws(E) -> Result where E: Error, Result : ~Copyable {
+    return try body()
+}
+#else
 // Disable stdout stream buffering for more immediate output.
 setbuf(__stdoutp, nil)
+#endif
 
 Mist.main()
 exit(0)

Package.swift

@@ -14,6 +14,7 @@ let package: Package = .init(
     ],
     dependencies: [
         .package(url: "https://github.com/apple/swift-argument-parser", from: "1.6.1"),
+        .package(url: "https://github.com/apple/swift-crypto.git", "1.0.0" ..< "5.0.0"),
         // .package(url: "https://github.com/nicklockwood/SwiftFormat", from: "0.57.2"),
         .package(url: "https://github.com/SimplyDanny/SwiftLintPlugins", from: "0.61.0"),
         .package(url: "https://github.com/jpsim/Yams", from: "6.1.0")
@@ -23,6 +24,7 @@ let package: Package = .init(
             name: "Mist",
             dependencies: [
                 .product(name: "ArgumentParser", package: "swift-argument-parser"),
+                .product(name: "Crypto", package: "swift-crypto"),
                 .product(name: "Yams", package: "Yams")
             ],
             path: "Mist"