xcodes runtimes install fails with dataCorrupted - Authentication enum missing none case #485

xcodes runtimes install fails when parsing Apple's downloadable runtimes index because the Authentication enum in Runtimes.swift does not handle the "none" value that Apple recently introduced for 27.0 beta 3 simulator runtimes.

Error:

dataCorrupted(Swift.DecodingError.Context(

    codingPath: [

      CodingKeys(stringValue: "downloadables", intValue: nil),

      _CodingKey(stringValue: "Index 393", intValue: 393),

      CodingKeys(stringValue: "authentication", intValue: nil)

    ],

    debugDescription: "Cannot initialize Authentication from invalid String value none",

    underlyingError: nil

  ))

Apple's runtime index (devimages-cdn.apple.com/downloads/xcode/simulators/index2.dvtdownloadableindex) now includes 4 entries with "authentication": "none" (iOS/watchOS/tvOS/visionOS 27.0 beta 3). Parsing the full index fails before filtering to the requested version, so any xcodes runtimes install call breaks - even for older runtimes like iOS 26.2.

• xcodes: 2.0.2