chore: import upstream snapshot with attribution

Sources/ContainerVersion/Bundle+AppBundle.swift

@@ -0,0 +1,46 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 2025-2026 Apple Inc. and the container 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 Darwin
+import Foundation
+import SystemPackage
+
+extension Bundle {
+    /// Retrieves the application bundle for a path that refers to a macOS executable.
+    ///
+    /// Resolves symlinks in `executablePath`, then walks up the standard macOS bundle layout
+    /// (`MacOS/` → `Contents/` → `Foo.app/`) and verifies the `.app` extension.
+    ///
+    /// - Parameter executablePath: The path to a macOS executable inside a bundle.
+    /// - Returns: The ``Bundle`` at the resolved `.app` directory, or `nil` if the executable
+    ///   is not inside a valid macOS application bundle.
+    public static func appBundle(executablePath: FilePath) -> Bundle? {
+        let resolvedPath =
+            executablePath.withPlatformString { cPath in
+                Darwin.realpath(cPath, nil).map { ptr -> FilePath in
+                    defer { free(ptr) }
+                    return FilePath(platformString: ptr)
+                }
+            } ?? executablePath
+        let bundlePath =
+            resolvedPath
+            .removingLastComponent()  // MacOS/
+            .removingLastComponent()  // Contents/
+            .removingLastComponent()  // Foo.app/
+        guard bundlePath.lastComponent?.extension == "app" else { return nil }
+        return Bundle(url: URL(fileURLWithPath: bundlePath.string))
+    }
+}

Sources/ContainerVersion/CommandLine+Executable.swift

@@ -0,0 +1,41 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 2025-2026 Apple Inc. and the container 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 Foundation
+import SystemPackage
+
+extension CommandLine {
+    /// The path of the running executable.
+    ///
+    /// Obtained via `_NSGetExecutablePath`, which returns an absolute, lexically normalized path
+    /// (no `.` or `..` components). Symlinks are not resolved, so the path is not canonical.
+    public static var executablePath: FilePath {
+        /// _NSGetExecutablePath with a zero-length buffer returns the needed buffer length
+        var bufferSize: Int32 = 0
+        var buffer = [CChar](repeating: 0, count: Int(bufferSize))
+        _ = _NSGetExecutablePath(&buffer, &bufferSize)
+
+        /// Create the buffer and get the path
+        buffer = [CChar](repeating: 0, count: Int(bufferSize))
+        guard _NSGetExecutablePath(&buffer, &bufferSize) == 0 else {
+            fatalError("unexpected: failed to get executable path")
+        }
+
+        /// Return the path with the executable file component removed the last component and
+        let executablePath = String(cString: &buffer)
+        return FilePath(executablePath)
+    }
+}

Sources/ContainerVersion/ReleaseVersion.swift

@@ -0,0 +1,46 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 2025-2026 Apple Inc. and the container 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 CVersion
+import Foundation
+
+public struct ReleaseVersion {
+    public static func singleLine(appName: String) -> String {
+        var versionDetails: [String: String] = ["build": buildType()]
+        versionDetails["commit"] = gitCommit().map { String($0.prefix(7)) } ?? "unspecified"
+        let extras: String = versionDetails.map { "\($0): \($1)" }.sorted().joined(separator: ", ")
+
+        return "\(appName) version \(version()) (\(extras))"
+    }
+
+    public static func buildType() -> String {
+        #if DEBUG
+        return "debug"
+        #else
+        return "release"
+        #endif
+    }
+
+    public static func version() -> String {
+        let appBundle = Bundle.appBundle(executablePath: CommandLine.executablePath)
+        let bundleVersion = appBundle?.infoDictionary?["CFBundleShortVersionString"] as? String
+        return bundleVersion ?? get_release_version().map { String(cString: $0) } ?? "0.0.0"
+    }
+
+    public static func gitCommit() -> String? {
+        get_git_commit().map { String(cString: $0) }
+    }
+}