Smaller icon (#116)

Initially it wasn't fully following the [guidelines](https://developer.apple.com/design/human-interface-guidelines/macos/icons-and-images/app-icon/).

Fixes #112

Resources/AppIcon.png

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:8dd6af1a08bbcdc4faf0ff53601b38136c90231e11bd81bc8cd477d6f1c7d3f2
-size 209404
+oid sha256:1fe96aed7a965b075300f092a3ca76e09053eb7cf2f3125c3a819098a8bc4b31
+size 123360

Sources/tart/Commands/Clone.swift

@@ -11,24 +11,34 @@ struct Clone: AsyncParsableCommand {
   @Argument(help: "new VM name")
   var newName: String
 
+  func validate() throws {
+    if newName.contains("/") {
+      throw ValidationError("<new-name> should be a local name")
+    }
+  }
+
   func run() async throws {
     do {
-      if let remoteName = try? RemoteName(sourceName) {
-        if !VMStorageOCI().exists(remoteName) {
-          // Pull the VM in case it's OCI-based and doesn't exist locally yet
-          let registry = try Registry(host: remoteName.host, namespace: remoteName.namespace)
-          try await VMStorageOCI().pull(remoteName, registry: registry)
-        }
-        let remoteVM = try VMStorageHelper.open(sourceName)
+      let ociStorage = VMStorageOCI()
+      let localStorage = VMStorageLocal()
 
-        let remoteConfig = try VMConfig.init(fromURL: remoteVM.configURL)
-        let needToGenerateNewMAC = try localVMExistsWith(macAddress: remoteConfig.macAddress.string)
-
-        try remoteVM.clone(to: VMStorageLocal().create(newName), generateMAC: needToGenerateNewMAC)
-      } else {
-        try VMStorageHelper.open(sourceName).clone(to: VMStorageLocal().create(newName), generateMAC: true)
+      if let remoteName = try? RemoteName(sourceName), !ociStorage.exists(remoteName) {
+        // Pull the VM in case it's OCI-based and doesn't exist locally yet
+        let registry = try Registry(host: remoteName.host, namespace: remoteName.namespace)
+        try await ociStorage.pull(remoteName, registry: registry)
       }
 
+      let sourceVM = try VMStorageHelper.open(sourceName)
+      let generateMAC = try localStorage.hasVMsWithMACAddress(macAddress: sourceVM.macAddress())
+
+      let tmpVMDir = try VMDirectory.temporary()
+      try await withTaskCancellationHandler(operation: {
+        try sourceVM.clone(to: tmpVMDir, generateMAC: generateMAC)
+        try localStorage.move(newName, from: tmpVMDir)
+      }, onCancel: {
+        try? FileManager.default.removeItem(at: tmpVMDir.baseURL)
+      })
+
       Foundation.exit(0)
     } catch {
       print(error)
@@ -36,15 +46,16 @@ struct Clone: AsyncParsableCommand {
       Foundation.exit(1)
     }
   }
+}
 
-  private func localVMExistsWith(macAddress: String) throws -> Bool {
-    var needToGenerateNewMAC = false
-    for (_, localDir) in try VMStorageLocal().list() {
-      let localConfig = try VMConfig.init(fromURL: localDir.configURL)
-      if localConfig.macAddress.string == macAddress {
-        needToGenerateNewMAC = true
-      }
-    }
-    return needToGenerateNewMAC
+fileprivate extension VMDirectory {
+  func macAddress() throws -> String {
+    try VMConfig(fromURL: configURL).macAddress.string
+  }
+}
+
+fileprivate extension VMStorageLocal {
+  func hasVMsWithMACAddress(macAddress: String) throws -> Bool {
+    try list().contains { try $1.macAddress() == macAddress }
   }
 }

Sources/tart/Commands/Create.swift

@@ -23,13 +23,18 @@ struct Create: AsyncParsableCommand {
 
   func run() async throws {
     do {
-      let vmDir = try VMStorageLocal().create(name)
+      let tmpVMDir = try VMDirectory.temporary()
+      try await withTaskCancellationHandler(operation: {
+        if fromIPSW! == "latest" {
+          _ = try await VM(vmDir: tmpVMDir, ipswURL: nil, diskSizeGB: diskSize)
+        } else {
+          _ = try await VM(vmDir: tmpVMDir, ipswURL: URL(fileURLWithPath: fromIPSW!), diskSizeGB: diskSize)
+        }
 
-      if fromIPSW! == "latest" {
-        _ = try await VM(vmDir: vmDir, ipswURL: nil, diskSizeGB: diskSize)
-      } else {
-        _ = try await VM(vmDir: vmDir, ipswURL: URL(fileURLWithPath: fromIPSW!), diskSizeGB: diskSize)
-      }
+        try VMStorageLocal().move(name, from: tmpVMDir)
+      }, onCancel: {
+        try? FileManager.default.removeItem(at: tmpVMDir.baseURL)
+      })
 
       Foundation.exit(0)
     } catch {

Sources/tart/Commands/IP.swift

@@ -17,7 +17,7 @@ struct IP: AsyncParsableCommand {
       let vmDir = try VMStorageLocal().open(name)
       let vmConfig = try VMConfig.init(fromURL: vmDir.configURL)
 
-      guard let ip = try await resolveIP(vmConfig, secondsToWait: wait) else {
+      guard let ip = try await IP.resolveIP(vmConfig, secondsToWait: wait) else {
         print("no IP address found, is your VM running?")
 
         Foundation.exit(1)
@@ -33,7 +33,7 @@ struct IP: AsyncParsableCommand {
     }
   }
 
-  private func resolveIP(_ config: VMConfig, secondsToWait: UInt16) async throws -> IPv4Address? {
+  static public func resolveIP(_ config: VMConfig, secondsToWait: UInt16) async throws -> IPv4Address? {
     let waitUntil = Calendar.current.date(byAdding: .second, value: Int(secondsToWait), to: Date.now)!
     let vmMacAddress = MACAddress(fromString: config.macAddress.string)!
 

Sources/tart/Commands/Login.swift

@@ -10,9 +10,21 @@ struct Login: AsyncParsableCommand {
 
   func run() async throws {
     do {
-      let (user, password) = try Credentials.retrieveStdin()
+      let (user, password) = try StdinCredentials.retrieve()
+      let credentialsProvider = DictionaryCredentialsProvider([
+        host: (user, password)
+      ])
 
-      try Credentials.store(host: host, user: user, password: password)
+      do {
+        let registry = try Registry(host: host, namespace: "", credentialsProvider: credentialsProvider)
+        try await registry.ping()
+      } catch {
+        print("invalid credentials: \(error)")
+
+        Foundation.exit(1)
+      }
+
+      try KeychainCredentialsProvider().store(host: host, user: user, password: password)
 
       Foundation.exit(0)
     } catch {
@@ -22,3 +34,19 @@ struct Login: AsyncParsableCommand {
     }
   }
 }
+
+fileprivate class DictionaryCredentialsProvider: CredentialsProvider {
+  var credentials: Dictionary<String, (String, String)>
+
+  init(_ credentials: Dictionary<String, (String, String)>) {
+    self.credentials = credentials
+  }
+
+  func retrieve(host: String) throws -> (String, String)? {
+    credentials[host]
+  }
+
+  func store(host: String, user: String, password: String) throws {
+    credentials[host] = (user, password)
+  }
+}

Sources/tart/Commands/Push.swift

@@ -12,6 +12,10 @@ struct Push: AsyncParsableCommand {
   @Argument(help: "remote VM name(s)")
   var remoteNames: [String]
 
+  @Flag(help: ArgumentHelp("cache pushed images locally",
+          discussion: "Increases disk usage, but saves time if you're going to pull the pushed images later."))
+  var populateCache: Bool = false
+
   func run() async throws {
     do {
       let localVMDir = try VMStorageLocal().open(localName)
@@ -35,12 +39,20 @@ struct Push: AsyncParsableCommand {
       for (registryIdentifier, remoteNamesForRegistry) in registryGroups {
         let registry = try Registry(host: registryIdentifier.host, namespace: registryIdentifier.namespace)
 
-        let listOfTagsAndDigests = "{" + remoteNamesForRegistry.map{$0.fullyQualifiedReference }
-                .joined(separator: ",") + "}"
         defaultLogger.appendNewLine("pushing \(localName) to "
-          + "\(registryIdentifier.host)/\(registryIdentifier.namespace)\(listOfTagsAndDigests)...")
+          + "\(registryIdentifier.host)/\(registryIdentifier.namespace)\(remoteNamesForRegistry.referenceNames())...")
 
-        try await localVMDir.pushToRegistry(registry: registry, references: remoteNamesForRegistry.map{ $0.reference })
+        let pushedRemoteName = try await localVMDir.pushToRegistry(registry: registry, references: remoteNamesForRegistry.map{ $0.reference.value })
+
+        // Populate the local cache (if requested)
+        if populateCache {
+          let ociStorage = VMStorageOCI()
+          let expectedPushedVMDir = try ociStorage.create(pushedRemoteName)
+          try localVMDir.clone(to: expectedPushedVMDir, generateMAC: false)
+          for remoteName in remoteNamesForRegistry {
+            try ociStorage.link(from: remoteName, to: pushedRemoteName)
+          }
+        }
       }
 
       Foundation.exit(0)
@@ -51,3 +63,15 @@ struct Push: AsyncParsableCommand {
     }
   }
 }
+
+extension Collection where Element == RemoteName {
+  func referenceNames() -> String {
+    let references = self.map{ $0.reference.fullyQualified }
+
+    switch count {
+    case 0: return "∅"
+    case 1: return references.first!
+    default: return "{" + references.joined(separator: ",") + "}"
+    }
+  }
+}

Sources/tart/Commands/Run.swift

@@ -5,35 +5,72 @@ import Virtualization
 
 var vm: VM?
 
+struct IPNotFound: Error {
+}
+
 struct Run: AsyncParsableCommand {
   static var configuration = CommandConfiguration(abstract: "Run a VM")
 
   @Argument(help: "VM name")
   var name: String
 
-  @Flag var noGraphics: Bool = false
+  @Flag(help: ArgumentHelp(
+          "Don't open a UI window.",
+          discussion: "Useful for integrating Tart VMs into other tools.\nUse `tart ip` in order to get an IP for SSHing or VNCing into the VM.")) 
+  var noGraphics: Bool = false
 
-  @Flag var recovery: Bool = false
+  @Flag(help: "Boot into recovery mode") 
+  var recovery: Bool = false
+  
+  @Flag(help: ArgumentHelp(
+          "Use screen sharing instead of the built-in UI.",
+          discussion: "Useful since VNC supports copy/paste, drag and drop, etc.\nNote that Remote Login option should be enabled inside the VM.")) 
+  var vnc: Bool = false
 
   @MainActor
   func run() async throws {
+    if recovery && vnc {
+      print("You can't run in recovery and use VNC!")
+      Foundation.exit(1)      
+    }
+    
     let vmDir = try VMStorageLocal().open(name)
     vm = try VM(vmDir: vmDir)
 
     await withThrowingTaskGroup(of: Void.self) { group in
+      if vnc {
+        group.addTask(operation: {
+          do {
+            print("Waiting for the VM to boot...")
+            let resolvedIP = try await IP.resolveIP(vm!.config, secondsToWait: 60)
+            guard let ip = resolvedIP else {
+              throw IPNotFound()
+            }
+            let url = URL(string: "vnc://\(ip)")!
+            print("Opening \(url)")
+            NSWorkspace.shared.open(url)
+          } catch {
+            print("Failed to get an IP for screen sharing: \(error)")
+          }
+        })
+      }
       group.addTask {
         do {
           try await vm!.run(recovery)
 
           Foundation.exit(0)
         } catch {
-          print(error)
+          if error.localizedDescription.contains("Failed to lock auxiliary storage.") {
+            print("Virtual machine \"\(name)\" is already running!")
+          } else {
+            print(error)
+          }
 
           Foundation.exit(1)
         }
       }
 
-      if noGraphics {
+      if noGraphics || vnc {
         dispatchMain()
       } else {
         runUI()

Sources/tart/Commands/Set.swift

@@ -2,7 +2,7 @@ import ArgumentParser
 import Foundation
 
 struct Set: AsyncParsableCommand {
-  static var configuration = CommandConfiguration(abstract: "Modify VM's configuration")
+  static var configuration = CommandConfiguration(commandName: "set", abstract: "Modify VM's configuration")
 
   @Argument(help: "VM name")
   var name: String
@@ -13,7 +13,7 @@ struct Set: AsyncParsableCommand {
   @Option(help: "VM memory size in megabytes")
   var memory: UInt16?
 
-  @Option(help: "VM display settings in a format of <width>x<height>(x<dpi>)?. For example, 1200x800 or 1200x800x72")
+  @Option(help: "VM display resolution in a format of <width>x<height>. For example, 1200x800")
   var display: VMDisplayConfig?
 
   @Option(help: .hidden)
@@ -39,9 +39,6 @@ struct Set: AsyncParsableCommand {
         if (display.height > 0) {
           vmConfig.display.height = display.height
         }
-        if (display.dpi > 0) {
-          vmConfig.display.dpi = display.dpi
-        }
       }
 
       try vmConfig.save(toURL: vmDir.configURL)
@@ -66,8 +63,7 @@ extension VMDisplayConfig: ExpressibleByArgument {
     }
     self = VMDisplayConfig(
       width: parts[safe: 0] ?? 0,
-      height: parts[safe: 1] ?? 0,
-      dpi: parts[safe: 2] ?? 0
+      height: parts[safe: 1] ?? 0
     )
   }
 }

Sources/tart/Credentials.swift

@@ -1,82 +0,0 @@
-import Foundation
-
-enum CredentialsError: Error {
-  case CredentialRequired(which: String)
-  case CredentialTooLong(message: String)
-}
-
-class Credentials {
-  static func retrieveKeychain(host: String) throws -> (String, String)? {
-    let query: [String: Any] = [kSecClass as String: kSecClassInternetPassword,
-                                kSecAttrProtocol as String: kSecAttrProtocolHTTPS,
-                                kSecAttrServer as String: host,
-                                kSecMatchLimit as String: kSecMatchLimitOne,
-                                kSecReturnAttributes as String: true,
-                                kSecReturnData as String: true,
-                                kSecAttrLabel as String: "Tart Credentials",
-    ]
-
-    var item: CFTypeRef?
-    let status = SecItemCopyMatching(query as CFDictionary, &item)
-
-    if status != errSecSuccess {
-      if status == errSecItemNotFound {
-        return nil
-      }
-
-      throw RegistryError.AuthFailed(why: "Keychain returned unsuccessful status \(status)")
-    }
-
-    guard let item = item as? [String: Any],
-          let user = item[kSecAttrAccount as String] as? String,
-          let passwordData = item[kSecValueData as String] as? Data,
-          let password = String(data: passwordData, encoding: .utf8)
-      else {
-      throw RegistryError.AuthFailed(why: "Keychain item has unexpected format")
-    }
-
-    return (user, password)
-  }
-
-  static func retrieveStdin() throws -> (String, String) {
-    let user = try readStdinCredential(name: "username", prompt: "User: ", isSensitive: false)
-    let password = try readStdinCredential(name: "password", prompt: "Password: ", isSensitive: true)
-
-    return (user, password)
-  }
-
-  private static func readStdinCredential(name: String, prompt: String, maxCharacters: Int = 255, isSensitive: Bool) throws -> String {
-    var buf = [CChar](repeating: 0, count: maxCharacters + 1 /* sentinel */ + 1 /* NUL */)
-    guard let rawCredential = readpassphrase(prompt, &buf, buf.count, isSensitive ? RPP_ECHO_OFF : RPP_ECHO_ON) else {
-      throw CredentialsError.CredentialRequired(which: name)
-    }
-
-    let credential = String(cString: rawCredential).trimmingCharacters(in: .newlines)
-
-    if credential.count > maxCharacters {
-      throw CredentialsError.CredentialTooLong(
-        message: "\(name) should contain no more than \(maxCharacters) characters")
-    }
-
-    return credential
-  }
-
-  static func store(host: String, user: String, password: String) throws {
-    let attributes: [String: Any] = [kSecClass as String: kSecClassInternetPassword,
-                                     kSecAttrAccount as String: user,
-                                     kSecAttrProtocol as String: kSecAttrProtocolHTTPS,
-                                     kSecAttrServer as String: host,
-                                     kSecValueData as String: password,
-                                     kSecAttrLabel as String: "Tart Credentials",
-    ]
-
-    let status = SecItemAdd(attributes as CFDictionary, nil)
-
-    switch status {
-    case errSecSuccess, errSecDuplicateItem:
-      return
-    default:
-      throw RegistryError.AuthFailed(why: "Keychain returned unsuccessful status \(status)")
-    }
-  }
-}

Sources/tart/Credentials/CredentialsProvider.swift

@@ -0,0 +1,10 @@
+import Foundation
+
+enum CredentialsProviderError: Error {
+    case Failed(message: String)
+}
+
+protocol CredentialsProvider {
+    func retrieve(host: String) throws -> (String, String)?
+    func store(host: String, user: String, password: String) throws
+}

Sources/tart/Credentials/KeychainCredentialsProvider.swift

@@ -0,0 +1,54 @@
+import Foundation
+
+class KeychainCredentialsProvider: CredentialsProvider {
+    func retrieve(host: String) throws -> (String, String)? {
+        let query: [String: Any] = [kSecClass as String: kSecClassInternetPassword,
+                                    kSecAttrProtocol as String: kSecAttrProtocolHTTPS,
+                                    kSecAttrServer as String: host,
+                                    kSecMatchLimit as String: kSecMatchLimitOne,
+                                    kSecReturnAttributes as String: true,
+                                    kSecReturnData as String: true,
+                                    kSecAttrLabel as String: "Tart Credentials",
+        ]
+
+        var item: CFTypeRef?
+        let status = SecItemCopyMatching(query as CFDictionary, &item)
+
+        if status != errSecSuccess {
+            if status == errSecItemNotFound {
+                return nil
+            }
+
+            throw CredentialsProviderError.Failed(message: "Keychain returned unsuccessful status \(status)")
+        }
+
+        guard let item = item as? [String: Any],
+              let user = item[kSecAttrAccount as String] as? String,
+              let passwordData = item[kSecValueData as String] as? Data,
+              let password = String(data: passwordData, encoding: .utf8)
+        else {
+            throw CredentialsProviderError.Failed(message: "Keychain item has unexpected format")
+        }
+
+        return (user, password)
+    }
+
+    func store(host: String, user: String, password: String) throws {
+        let attributes: [String: Any] = [kSecClass as String: kSecClassInternetPassword,
+                                         kSecAttrAccount as String: user,
+                                         kSecAttrProtocol as String: kSecAttrProtocolHTTPS,
+                                         kSecAttrServer as String: host,
+                                         kSecValueData as String: password,
+                                         kSecAttrLabel as String: "Tart Credentials",
+        ]
+
+        let status = SecItemAdd(attributes as CFDictionary, nil)
+
+        switch status {
+        case errSecSuccess, errSecDuplicateItem:
+            return
+        default:
+            throw CredentialsProviderError.Failed(message: "Keychain returned unsuccessful status \(status)")
+        }
+    }
+}

Sources/tart/Credentials/StdinCredentials.swift

@@ -0,0 +1,31 @@
+import Foundation
+
+enum StdinCredentialsError: Error {
+  case CredentialRequired(which: String)
+  case CredentialTooLong(message: String)
+}
+
+class StdinCredentials {
+  static func retrieve() throws -> (String, String) {
+    let user = try readStdinCredential(name: "username", prompt: "User: ", isSensitive: false)
+    let password = try readStdinCredential(name: "password", prompt: "Password: ", isSensitive: true)
+
+    return (user, password)
+  }
+
+  private static func readStdinCredential(name: String, prompt: String, maxCharacters: Int = 255, isSensitive: Bool) throws -> String {
+    var buf = [CChar](repeating: 0, count: maxCharacters + 1 /* sentinel */ + 1 /* NUL */)
+    guard let rawCredential = readpassphrase(prompt, &buf, buf.count, isSensitive ? RPP_ECHO_OFF : RPP_ECHO_ON) else {
+      throw StdinCredentialsError.CredentialRequired(which: name)
+    }
+
+    let credential = String(cString: rawCredential).trimmingCharacters(in: .newlines)
+
+    if credential.count > maxCharacters {
+      throw StdinCredentialsError.CredentialTooLong(
+        message: "\(name) should contain no more than \(maxCharacters) characters")
+    }
+
+    return credential
+  }
+}

Sources/tart/OCI/Manifest.swift

@@ -8,6 +8,10 @@ struct OCIManifest: Codable, Equatable {
   var mediaType: String = ociManifestMediaType
   var config: OCIManifestConfig
   var layers: [OCIManifestLayer] = Array()
+
+  func digest() throws -> String {
+    try Digest.hash(JSONEncoder().encode(self))
+  }
 }
 
 struct OCIManifestConfig: Codable, Equatable {

Sources/tart/OCI/Registry.swift

@@ -72,27 +72,40 @@ struct TokenResponse: Decodable {
   }
 }
 
-fileprivate let httpClient = HTTPClient(eventLoopGroupProvider: .createNew)
-
 class Registry {
-  var baseURL: URL
-  var namespace: String
+  private let httpClient = HTTPClient(eventLoopGroupProvider: .createNew)
+  
+  deinit {
+    try! httpClient.syncShutdown()
+  }
+  
+  let baseURL: URL
+  let namespace: String
+  let credentialsProvider: CredentialsProvider
 
   var currentAuthToken: TokenResponse? = nil
 
-  init(urlComponents: URLComponents, namespace: String) throws {
+  init(urlComponents: URLComponents,
+       namespace: String,
+       credentialsProvider: CredentialsProvider = KeychainCredentialsProvider()
+  ) throws {
     baseURL = urlComponents.url!
     self.namespace = namespace
+    self.credentialsProvider = credentialsProvider
   }
 
-  convenience init(host: String, namespace: String) throws {
+  convenience init(
+          host: String,
+          namespace: String,
+          credentialsProvider: CredentialsProvider = KeychainCredentialsProvider()
+  ) throws {
     var baseURLComponents = URLComponents()
 
     baseURLComponents.scheme = "https"
     baseURLComponents.host = host
     baseURLComponents.path = "/v2/"
 
-    try self.init(urlComponents: baseURLComponents, namespace: namespace)
+    try self.init(urlComponents: baseURLComponents, namespace: namespace, credentialsProvider: credentialsProvider)
   }
 
   func ping() async throws {
@@ -281,7 +294,7 @@ class Registry {
 
     var headers: Dictionary<String, String> = Dictionary()
 
-    if let (user, password) = try Credentials.retrieveKeychain(host: baseURL.host!) {
+    if let (user, password) = try credentialsProvider.retrieve(host: baseURL.host!) {
       let encodedCredentials = "\(user):\(password)".data(using: .utf8)?.base64EncodedString()
       headers["Authorization"] = "Basic \(encodedCredentials!)"
     }

Sources/tart/OCI/RemoteName.swift

@@ -1,31 +1,57 @@
 import Foundation
 import Parsing
 
-struct Tail {
-  enum TailType {
+struct Reference: Comparable, Hashable, CustomStringConvertible {
+  enum ReferenceType: Comparable {
     case Tag
     case Digest
   }
 
-  var type: TailType
-  var value: String
-}
+  let type: ReferenceType
+  let value: String
 
-struct RemoteName: Comparable, CustomStringConvertible {
-  var host: String
-  var namespace: String
-  var reference: String = "latest"
-  var fullyQualifiedReference: String {
+  var fullyQualified: String {
     get {
-      if reference.starts(with: "sha256:") {
-        return "@" + reference
+      switch type {
+      case .Tag:
+        return ":" + value
+      case .Digest:
+        return "@" + value
       }
-
-      return ":" + reference
     }
   }
 
-  init(host: String, namespace: String, reference: String) {
+  init(tag: String) {
+    type = .Tag
+    value = tag
+  }
+
+  init(digest: String) {
+    type = .Digest
+    value = digest
+  }
+
+  static func <(lhs: Reference, rhs: Reference) -> Bool {
+    if lhs.type != rhs.type {
+      return lhs.type < rhs.type
+    } else {
+      return lhs.value < rhs.value
+    }
+  }
+
+  var description: String {
+    get {
+      fullyQualified
+    }
+  }
+}
+
+struct RemoteName: Comparable, Hashable, CustomStringConvertible {
+  var host: String
+  var namespace: String
+  var reference: Reference
+
+  init(host: String, namespace: String, reference: Reference) {
     self.host = host
     self.namespace = namespace
     self.reference = reference
@@ -58,13 +84,13 @@ struct RemoteName: Comparable, CustomStringConvertible {
           Parse {
             ":"
             csNormal.map {
-              Tail(type: .Tag, value: String($0))
+              Reference(tag: String($0))
             }
           }
           Parse {
             "@sha256:"
             csHex.map {
-              Tail(type: .Digest, value: "sha256:" + String($0))
+              Reference(digest: "sha256:" + String($0))
             }
           }
         }
@@ -76,9 +102,7 @@ struct RemoteName: Comparable, CustomStringConvertible {
 
     host = String(result.0)
     namespace = String(result.1)
-    if let tail = result.2 {
-      reference = tail.value
-    }
+    reference = result.2 ?? Reference(tag: "latest")
   }
 
   static func <(lhs: RemoteName, rhs: RemoteName) -> Bool {
@@ -92,7 +116,7 @@ struct RemoteName: Comparable, CustomStringConvertible {
   }
 
   var description: String {
-    "\(host)/\(namespace)\(fullyQualifiedReference)"
+    "\(host)/\(namespace)\(reference.fullyQualified)"
   }
 }
 

Sources/tart/Root.swift

@@ -20,11 +20,15 @@ struct Root: AsyncParsableCommand {
     ])
 
   public static func main() async throws {
-    // Handle cancellation by Ctrl+C
+    // Ensure the default SIGINT handled is disabled,
+    // otherwise there's a race between two handlers
+    signal(SIGINT, SIG_IGN);
+    // Handle cancellation by Ctrl+C ourselves
     let task = withUnsafeCurrentTask { $0 }!
     let sigintSrc = DispatchSource.makeSignalSource(signal: SIGINT)
     sigintSrc.setEventHandler {
       task.cancel()
+      Darwin.exit(1)
     }
     sigintSrc.activate()
 

Sources/tart/VM.swift

@@ -172,13 +172,24 @@ class VM: NSObject, VZVirtualMachineDelegate, ObservableObject {
 
     // Display
     let graphicsDeviceConfiguration = VZMacGraphicsDeviceConfiguration()
-    graphicsDeviceConfiguration.displays = [
-      VZMacGraphicsDisplayConfiguration(
-        widthInPixels: vmConfig.display.width,
-        heightInPixels: vmConfig.display.height,
-        pixelsPerInch: vmConfig.display.dpi
+    if let hostMainScreen = NSScreen.main {
+      let vmScreenSize = NSSize(
+        width: vmConfig.display.width,
+        height: vmConfig.display.height
       )
-    ]
+      graphicsDeviceConfiguration.displays = [
+        VZMacGraphicsDisplayConfiguration(for: hostMainScreen, sizeInPoints: vmScreenSize)
+      ]
+    } else {
+      graphicsDeviceConfiguration.displays = [
+        VZMacGraphicsDisplayConfiguration(
+          widthInPixels: vmConfig.display.width,
+          heightInPixels: vmConfig.display.height,
+          // Reasonable guess like https://developer.apple.com/documentation/coregraphics/1456599-cgdisplayscreensize    
+          pixelsPerInch: 72
+        )
+      ]
+    }
     configuration.graphicsDevices = [graphicsDeviceConfiguration]
 
     // Audio

Sources/tart/VMConfig.swift

@@ -29,7 +29,6 @@ enum CodingKeys: String, CodingKey {
 struct VMDisplayConfig: Codable {
   var width: Int = 1024
   var height: Int = 768
-  var dpi: Int = 72
 }
 
 struct VMConfig: Codable {

Sources/tart/VMDirectory+OCI.swift

@@ -98,7 +98,7 @@ extension VMDirectory {
     try nvram.close()
   }
 
-  func pushToRegistry(registry: Registry, references: [String]) async throws {
+  func pushToRegistry(registry: Registry, references: [String]) async throws -> RemoteName {
     var layers = Array<OCIManifestLayer>()
 
     // Read VM's config and push it as blob
@@ -155,6 +155,9 @@ extension VMDirectory {
 
       _ = try await registry.pushManifest(reference: reference, manifest: manifest)
     }
+
+    let pushedReference = Reference(digest: try manifest.digest())
+    return RemoteName(host: registry.baseURL.host!, namespace: registry.namespace, reference: pushedReference)
   }
 }
 

Sources/tart/VMDirectory.swift

@@ -24,6 +24,13 @@ struct VMDirectory {
     baseURL.lastPathComponent
   }
 
+  static func temporary() throws -> VMDirectory {
+    let tmpDir = FileManager.default.temporaryDirectory.appendingPathComponent(UUID().uuidString)
+    try FileManager.default.createDirectory(at: tmpDir, withIntermediateDirectories: false)
+
+    return VMDirectory(baseURL: tmpDir)
+  }
+
   var initialized: Bool {
     FileManager.default.fileExists(atPath: configURL.path) &&
       FileManager.default.fileExists(atPath: diskURL.path) &&

Sources/tart/VMStorageLocal.swift

@@ -27,6 +27,11 @@ class VMStorageLocal {
     return vmDir
   }
 
+  func move(_ name: String, from: VMDirectory) throws {
+    _ = try FileManager.default.createDirectory(at: baseURL, withIntermediateDirectories: true)
+    _ = try FileManager.default.replaceItemAt(vmURL(name), withItemAt: from.baseURL)
+  }
+
   func delete(_ name: String) throws {
     try FileManager.default.removeItem(at: vmURL(name))
   }

Sources/tart/VMStorageOCI.swift

@@ -27,6 +27,17 @@ class VMStorageOCI {
     return vmDir
   }
 
+  func move(_ name: RemoteName, from: VMDirectory) throws{
+    let targetURL = vmURL(name)
+
+    // Pre-create intermediate directories (e.g. creates ~/.tart/cache/OCIs/github.com/org/repo/
+    // for github.com/org/repo:latest)
+    try FileManager.default.createDirectory(at: targetURL.deletingLastPathComponent(),
+            withIntermediateDirectories: true)
+
+    _ = try FileManager.default.replaceItemAt(targetURL, withItemAt: from.baseURL)
+  }
+
   func delete(_ name: RemoteName) throws {
     try FileManager.default.removeItem(at: vmURL(name))
   }
@@ -64,35 +75,43 @@ class VMStorageOCI {
   func pull(_ name: RemoteName, registry: Registry) async throws {
     defaultLogger.appendNewLine("pulling manifest...")
 
-    let (manifest, manifestData) = try await registry.pullManifest(reference: name.reference)
+    let (manifest, _) = try await registry.pullManifest(reference: name.reference.value)
+
+    var digestName = RemoteName(host: name.host, namespace: name.namespace,
+            reference: Reference(digest: try manifest.digest()))
 
-    // Create directory for manifest's digest
-    var digestName = name
-    digestName.reference = Digest.hash(manifestData)
     if !exists(digestName) {
-      let vmDir = try create(digestName)
-      try await vmDir.pullFromRegistry(registry: registry, manifest: manifest)
+      let tmpVMDir = try VMDirectory.temporary()
+      try await withTaskCancellationHandler(operation: {
+        try await tmpVMDir.pullFromRegistry(registry: registry, manifest: manifest)
+        try move(digestName, from: tmpVMDir)
+      }, onCancel: {
+        try? FileManager.default.removeItem(at: tmpVMDir.baseURL)
+      })
     } else {
-      defaultLogger.appendNewLine("\(digestName.reference) image is already cached! creating a symlink...")   
+      defaultLogger.appendNewLine("\(digestName) image is already cached! creating a symlink...")
     }
 
-    // Create directory for reference if it's different
-    if digestName != name {
+    if name != digestName {
       // Overwrite the old symbolic link
-      if FileManager.default.fileExists(atPath: vmURL(name).path) {
-        try FileManager.default.removeItem(at: vmURL(name))
-      }
-
-      try FileManager.default.createSymbolicLink(at: vmURL(name), withDestinationURL: vmURL(digestName))
+      try link(from: digestName, to: name)
     }
   }
+
+  func link(from: RemoteName, to: RemoteName) throws {
+    if FileManager.default.fileExists(atPath: vmURL(to).path) {
+      try FileManager.default.removeItem(at: vmURL(to))
+    }
+
+    try FileManager.default.createSymbolicLink(at: vmURL(to), withDestinationURL: vmURL(from))
+  }
 }
 
 extension URL {
   func appendingRemoteName(_ name: RemoteName) -> URL {
     var result: URL = self
 
-    for pathComponent in (name.host + "/" + name.namespace + "/" + name.reference).split(separator: "/") {
+    for pathComponent in (name.host + "/" + name.namespace + "/" + name.reference.value).split(separator: "/") {
       result = result.appendingPathComponent(String(pathComponent))
     }
 

Tests/TartTests/RemoteNameTests.swift

@@ -3,13 +3,13 @@ import XCTest
 
 final class RemoteNameTests: XCTestCase {
   func testTag() throws {
-    let expectedRemoteName = RemoteName(host: "ghcr.io", namespace: "a/b", reference: "latest")
+    let expectedRemoteName = RemoteName(host: "ghcr.io", namespace: "a/b", reference: Reference(tag: "latest"))
 
     XCTAssertEqual(expectedRemoteName, try RemoteName("ghcr.io/a/b:latest"))
   }
   
   func testComplexTag() throws {
-    let expectedRemoteName = RemoteName(host: "ghcr.io", namespace: "a/b", reference: "1.2.3-RC-1")
+    let expectedRemoteName = RemoteName(host: "ghcr.io", namespace: "a/b", reference: Reference(tag: "1.2.3-RC-1"))
 
     XCTAssertEqual(expectedRemoteName, try RemoteName("ghcr.io/a/b:1.2.3-RC-1"))
   }
@@ -18,7 +18,7 @@ final class RemoteNameTests: XCTestCase {
     let expectedRemoteName = RemoteName(
       host: "ghcr.io",
       namespace: "a/b",
-      reference: "sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"
+      reference: Reference(digest: "sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855")
     )
 
     XCTAssertEqual(expectedRemoteName,