Rosetta support (#324)

Sources/tart/Commands/Run.swift

@@ -48,6 +48,20 @@ struct Run: AsyncParsableCommand {
     """, valueName: "path[:ro]"))
   var disk: [String] = []
 
+  @Option(name: [.customLong("rosetta")], help: ArgumentHelp(
+    "Attaches a Rosetta share to the guest Linux VM with a specific tag (e.g. --rosetta=\"rosetta\")",
+    discussion: """
+                Requires host to be macOS 13.0 (Ventura) with Rosetta installed. The latter can be done
+                by running "softwareupdate --install-rosetta" (without quotes) in the Terminal.app.
+
+                Note that you also have to configure Rosetta in the guest Linux VM by following the
+                steps from "Mount the Shared Directory and Register Rosetta" section here:
+                https://developer.apple.com/documentation/virtualization/running_intel_binaries_in_linux_vms_with_rosetta#3978496
+                """,
+    valueName: "tag"
+  ))
+  var rosettaTag: String?
+
   @Option(help: ArgumentHelp("""
                              Additional directory shares with an optional read-only specifier\n(e.g. --dir=\"build:~/src/build\" --dir=\"sources:~/src/sources:ro\")
                              """, discussion: """
@@ -107,7 +121,7 @@ struct Run: AsyncParsableCommand {
       vmDir: vmDir,
       network: userSpecifiedNetwork(vmDir: vmDir) ?? NetworkShared(),
       additionalDiskAttachments: additionalDiskAttachments,
-      directoryShares: directoryShares()
+      directorySharingDevices: directoryShares() + rosettaDirectoryShare()
     )
 
     let vncImpl: VNC? = try {
@@ -242,8 +256,22 @@ struct Run: AsyncParsableCommand {
     return result
   }
 
-  func directoryShares() throws -> [DirectoryShare] {
-    var result: [DirectoryShare] = []
+  func directoryShares() throws -> [VZDirectorySharingDeviceConfiguration] {
+    if dir.isEmpty {
+      return []
+    }
+
+    guard #available(macOS 13, *) else {
+      throw UnsupportedOSError("directory sharing", "is")
+    }
+
+    struct DirectoryShare {
+      let name: String
+      let path: URL
+      let readOnly: Bool
+    }
+
+    var directoryShares: [DirectoryShare] = []
 
     for rawDir in dir {
       let splits = rawDir.split(maxSplits: 2) { $0 == ":" }
@@ -264,10 +292,46 @@ struct Run: AsyncParsableCommand {
 
       let (name, path) = (String(splits[0]), String(splits[1]))
 
-      result.append(DirectoryShare(name: name, path: URL(fileURLWithPath: NSString(string: path).expandingTildeInPath), readOnly: readOnly))
+      directoryShares.append(DirectoryShare(
+        name: name,
+        path: URL(fileURLWithPath: NSString(string: path).expandingTildeInPath),
+        readOnly: readOnly)
+      )
     }
 
-    return result
+    var directories: [String : VZSharedDirectory] = Dictionary()
+    directoryShares.forEach { directories[$0.name] = VZSharedDirectory(url: $0.path, readOnly: $0.readOnly) }
+
+    let automountTag = VZVirtioFileSystemDeviceConfiguration.macOSGuestAutomountTag
+    let sharingDevice = VZVirtioFileSystemDeviceConfiguration(tag: automountTag)
+    sharingDevice.share = VZMultipleDirectoryShare(directories: directories)
+
+    return [sharingDevice]
+  }
+
+  private func rosettaDirectoryShare() throws -> [VZDirectorySharingDeviceConfiguration] {
+    guard let rosettaTag = rosettaTag else {
+      return []
+    }
+
+    guard #available(macOS 13, *) else {
+      throw UnsupportedOSError("Rosetta directory share", "is")
+    }
+
+    switch VZLinuxRosettaDirectoryShare.availability {
+    case .notInstalled:
+      throw UnsupportedOSError("Rosetta directory share", "is", "that have Rosetta installed")
+    case .notSupported:
+      throw UnsupportedOSError("Rosetta directory share", "is", "running Apple silicon")
+    default:
+      break
+    }
+
+    try VZVirtioFileSystemDeviceConfiguration.validateTag(rosettaTag)
+    let device = VZVirtioFileSystemDeviceConfiguration(tag: rosettaTag)
+    device.share = try VZLinuxRosettaDirectoryShare()
+
+    return [device]
   }
 
   private func runUI() {

Sources/tart/VM.swift

@@ -14,8 +14,8 @@ struct DownloadFailed: Error {
 struct UnsupportedOSError: Error, CustomStringConvertible {
   let description: String
 
-  init(_ what: String, _ plural: String) {
-    description = "error: \(what) \(plural) only supported on hosts running macOS 13.0 (Ventura) or newer"
+  init(_ what: String, _ plural: String, _ requires: String = "running macOS 13.0 (Ventura) or newer") {
+    description = "error: \(what) \(plural) only supported on hosts \(requires)"
   }
 }
 
@@ -40,7 +40,7 @@ class VM: NSObject, VZVirtualMachineDelegate, ObservableObject {
   init(vmDir: VMDirectory,
        network: Network = NetworkShared(),
        additionalDiskAttachments: [VZDiskImageStorageDeviceAttachment] = [],
-       directoryShares: [DirectoryShare] = []
+       directorySharingDevices: [VZDirectorySharingDeviceConfiguration] = []
   ) throws {
     name = vmDir.name
     config = try VMConfig.init(fromURL: vmDir.configURL)
@@ -54,7 +54,8 @@ class VM: NSObject, VZVirtualMachineDelegate, ObservableObject {
     let configuration = try Self.craftConfiguration(diskURL: vmDir.diskURL,
       nvramURL: vmDir.nvramURL, vmConfig: config,
       network: network, additionalDiskAttachments: additionalDiskAttachments,
-            directoryShares: directoryShares)
+      directorySharingDevices: directorySharingDevices
+    )
     virtualMachine = VZVirtualMachine(configuration: configuration)
 
     super.init()
@@ -130,7 +131,8 @@ class VM: NSObject, VZVirtualMachineDelegate, ObservableObject {
     ipswURL: URL,
     diskSizeGB: UInt16,
     network: Network = NetworkShared(),
-    additionalDiskAttachments: [VZDiskImageStorageDeviceAttachment] = []
+    additionalDiskAttachments: [VZDiskImageStorageDeviceAttachment] = [],
+    directorySharingDevices: [VZDirectorySharingDeviceConfiguration] = []
   ) async throws {
     var ipswURL = ipswURL
 
@@ -177,7 +179,8 @@ class VM: NSObject, VZVirtualMachineDelegate, ObservableObject {
     let configuration = try Self.craftConfiguration(diskURL: vmDir.diskURL, nvramURL: vmDir.nvramURL,
       vmConfig: config, network: network,
       additionalDiskAttachments: additionalDiskAttachments,
-      directoryShares: [])
+      directorySharingDevices: directorySharingDevices
+    )
     virtualMachine = VZVirtualMachine(configuration: configuration)
 
     super.init()
@@ -253,7 +256,7 @@ class VM: NSObject, VZVirtualMachineDelegate, ObservableObject {
     vmConfig: VMConfig,
     network: Network = NetworkShared(),
     additionalDiskAttachments: [VZDiskImageStorageDeviceAttachment],
-    directoryShares: [DirectoryShare]
+    directorySharingDevices: [VZDirectorySharingDeviceConfiguration]
   ) throws -> VZVirtualMachineConfiguration {
     let configuration = VZVirtualMachineConfiguration()
 
@@ -297,19 +300,8 @@ class VM: NSObject, VZVirtualMachineDelegate, ObservableObject {
     // Entropy
     configuration.entropyDevices = [VZVirtioEntropyDeviceConfiguration()]
 
-    // Directory share
-    if #available(macOS 13, *) {
-      var directories: [String : VZSharedDirectory] = Dictionary()
-      directoryShares.forEach { directories[$0.name] = VZSharedDirectory(url: $0.path, readOnly: $0.readOnly) }
-
-      let automountTag = VZVirtioFileSystemDeviceConfiguration.macOSGuestAutomountTag
-      let sharingDevice = VZVirtioFileSystemDeviceConfiguration(tag: automountTag)
-      sharingDevice.share = VZMultipleDirectoryShare(directories: directories)
-
-      configuration.directorySharingDevices = [sharingDevice]
-    } else if !directoryShares.isEmpty {
-      throw UnsupportedOSError("directory sharing", "is")
-    }
+    // Directory sharing devices
+    configuration.directorySharingDevices = directorySharingDevices
 
     try configuration.validate()
 
@@ -331,9 +323,3 @@ class VM: NSObject, VZVirtualMachineDelegate, ObservableObject {
     sema.signal()
   }
 }
-
-struct DirectoryShare {
-  let name: String
-  let path: URL
-  let readOnly: Bool
-}