Add --enable-package-registry flag to CLI

Author: mattt

Sources/Commands/Options.swift

@@ -332,6 +332,10 @@ public struct SwiftToolOptions: ParsableArguments {
     ///  - important: Respects `--netrcOptional` option.
     @Option(name: .customLong("netrc-file"), completion: .file())
     var netrcFilePath: AbsolutePath?
+
+    @Flag(name: .customLong("enable-package-registry"),
+          help: "Enable dependency resolution using package registries when available")
+    var enablePackageRegistry: Bool = false
 
     public init() {}
 }

Sources/Commands/SwiftTool.swift

@@ -565,7 +565,8 @@ public class SwiftTool {
             isResolverPrefetchingEnabled: options.shouldEnableResolverPrefetching,
             skipUpdate: options.skipDependencyUpdate,
             enableResolverTrace: options.enableResolverTrace,
-            cachePath: cachePath
+            cachePath: cachePath,
+            enablePackageRegistry: options.enablePackageRegistry
         )
         _workspace = workspace
         _workspaceDelegate = delegate

Sources/Workspace/Workspace.swift

@@ -230,6 +230,8 @@ public class Workspace {
 
     fileprivate let additionalFileRules: [FileRuleDescription]
 
+    fileprivate let enablePackageRegistry: Bool
+
     /// Create a new package workspace.
     ///
     /// This will automatically load the persisted state for the package, if
@@ -266,7 +268,8 @@ public class Workspace {
         enablePubgrubResolver: Bool = false,
         skipUpdate: Bool = false,
         enableResolverTrace: Bool = false,
-        cachePath: AbsolutePath? = nil
+        cachePath: AbsolutePath? = nil,
+        enablePackageRegistry: Bool = false
     ) {
         self.delegate = delegate
         self.dataPath = dataPath
@@ -302,6 +305,8 @@ public class Workspace {
             cachePath: repositoriesCachePath)
         self.repositoryManager = repositoryManager
 
+        self.enablePackageRegistry = enablePackageRegistry
+
         self.checkoutsPath = self.dataPath.appending(component: "checkouts")
         self.artifactsPath = self.dataPath.appending(component: "artifacts")