chore: import upstream snapshot with attribution

Sources/cctl/cctl.swift

@@ -0,0 +1,88 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 2025-2026 Apple Inc. and the Containerization project authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//===----------------------------------------------------------------------===//
+
+import ArgumentParser
+import Containerization
+import ContainerizationOCI
+import Foundation
+import Logging
+
+let log = {
+    LoggingSystem.bootstrap(StreamLogHandler.standardError)
+    var log = Logger(label: "com.apple.containerization")
+    log.logLevel = .debug
+    return log
+}()
+
+@main
+struct Application: AsyncParsableCommand {
+    static let keychainID = "com.apple.containerization"
+    static let appRoot: URL = {
+        FileManager.default.urls(
+            for: .applicationSupportDirectory,
+            in: .userDomainMask
+        ).first!
+        .appendingPathComponent("com.apple.containerization")
+    }()
+
+    private static let _contentStore: ContentStore = {
+        try! LocalContentStore(path: appRoot.appendingPathComponent("content"))
+    }()
+
+    private static let _imageStore: ImageStore = {
+        try! ImageStore(
+            path: appRoot,
+            contentStore: contentStore
+        )
+    }()
+
+    static var imageStore: ImageStore {
+        _imageStore
+    }
+
+    static var contentStore: ContentStore {
+        _contentStore
+    }
+
+    static let configuration = CommandConfiguration(
+        commandName: "cctl",
+        abstract: "Utility CLI for Containerization",
+        version: "2.0.0",
+        subcommands: {
+            var commands: [any ParsableCommand.Type] = [
+                Rootfs.self,
+                Images.self,
+                Run.self,
+            ]
+            #if os(macOS)
+            commands.append(Login.self)
+            #elseif os(Linux)
+            commands.append(Bridge.self)
+            #endif
+            return commands
+        }()
+    )
+}
+
+extension String {
+    var absoluteURL: URL {
+        URL(fileURLWithPath: self).absoluteURL
+    }
+}
+
+extension String: Swift.Error {
+
+}