Adding dnu clearcache command

src/Microsoft.Dnx.Tooling/ClearCache/ClearCacheCommand.cs

@@ -0,0 +1,41 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.IO;
+
+namespace Microsoft.Dnx.Tooling
+{
+    internal class ClearCacheCommand
+    {
+        public ClearCacheCommand(Reports reports, string httpCacheDirectory)
+        {
+            Reports = reports;
+            HttpCacheDirectory = httpCacheDirectory;
+        }
+
+        public Reports Reports { get; }
+        public string HttpCacheDirectory { get; }
+
+        public int Execute()
+        {
+            if (Directory.Exists(HttpCacheDirectory))
+            {
+                Reports.Information.WriteLine($"Clearing cache directory {HttpCacheDirectory}");
+
+                try
+                {
+                    FileOperationUtils.DeleteFolder(HttpCacheDirectory);
+                    Reports.Information.WriteLine("Cache cleared.");
+                }
+                catch (Exception e)
+                {
+                    Reports.Error.WriteLine($"Unable to clear cache directory: {e.Message}");
+                    return 1;
+                }
+            }
+
+            return 0;
+        }
+    }
+}

src/Microsoft.Dnx.Tooling/ConsoleCommands/ClearCacheConsoleCommand.cs

@@ -0,0 +1,26 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using Microsoft.Dnx.Runtime.Common.CommandLine;
+
+namespace Microsoft.Dnx.Tooling
+{
+    internal static class ClearCacheConsoleCommand
+    {
+        public static void Register(CommandLineApplication cmdApp, ReportsFactory reportsFactory)
+        {
+            cmdApp.Command("clear-http-cache", c =>
+            {
+                c.Description = "Clears the package cache.";
+                c.HelpOption("-?|-h|--help");
+                c.OnExecute(() =>
+                {
+                    var command = new ClearCacheCommand(
+                        reportsFactory.CreateReports(quiet: false),
+                        DnuEnvironment.GetFolderPath(DnuFolderPath.HttpCacheDirectory));       
+                    return command.Execute();
+                });
+            });
+        }
+    }
+}

src/Microsoft.Dnx.Tooling/Program.cs

@@ -79,6 +79,7 @@ public int Main(string[] args)
             RestoreConsoleCommand.Register(app, reportsFactory, _environment, _runtimeEnv);
             WrapConsoleCommand.Register(app, reportsFactory);
             FeedsConsoleCommand.Register(app, reportsFactory);
+            ClearCacheConsoleCommand.Register(app, reportsFactory);
 
             return app.Execute(args);
         }