Add workload config command

src/Cli/dotnet/commands/InstallingWorkloadCommand.cs

@@ -244,12 +244,6 @@ protected IEnumerable<WorkloadId> GetInstalledWorkloads(bool fromPreviousSdk)
 
     internal static class InstallingWorkloadCommandParser
     {
-        public static readonly CliOption<string> WorkloadSetMode = new("--mode")
-        {
-            Description = Strings.WorkloadSetMode,
-            Hidden = true
-        };
-
         public static readonly CliOption<string> WorkloadSetVersionOption = new("--version")
         {
             Description = Strings.WorkloadSetVersionOptionDescription

src/Cli/dotnet/commands/dotnet-workload/WorkloadCommandParser.cs

@@ -124,6 +124,7 @@ private static CliCommand ConstructCommand()
             command.Subcommands.Add(WorkloadRestoreCommandParser.GetCommand());
             command.Subcommands.Add(WorkloadCleanCommandParser.GetCommand());
             command.Subcommands.Add(WorkloadElevateCommandParser.GetCommand());
+            command.Subcommands.Add(WorkloadConfigCommandParser.GetCommand());
 
             command.Validators.Add(commandResult =>
             {

src/Cli/dotnet/commands/dotnet-workload/config/LocalizableStrings.resx

@@ -0,0 +1,127 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+
+    Version 2.0
+
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+
+    Example:
+
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <data name="CommandDescription" xml:space="preserve">
+    <value>Modify or display workload configuration values.
+To display a value, specify the corresponding command-line option without providing a value.  For example: "dotnet workload config --update-mode"</value>
+  </data>
+  <data name="UpdateModeDescription" xml:space="preserve">
+    <value>Controls whether updates should look for workload sets or the latest version of each individual manifest.</value>
+  </data>
+</root>

src/Cli/dotnet/commands/dotnet-workload/config/WorkloadConfigCommand.cs

@@ -0,0 +1,97 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System;
+using System.Collections.Generic;
+using System.CommandLine;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.Deployment.DotNet.Releases;
+using Microsoft.DotNet.Cli;
+using Microsoft.DotNet.Cli.Utils;
+using Microsoft.DotNet.Workloads.Workload;
+using Microsoft.DotNet.Workloads.Workload.Install;
+using Microsoft.NET.Sdk.WorkloadManifestReader;
+
+#nullable enable
+
+namespace Microsoft.DotNet.Workloads.Workload.Config
+{
+    internal class WorkloadConfigCommand : WorkloadCommandBase
+    {
+        private bool _hasUpdateMode;
+        private string? _updateMode;
+        private readonly IWorkloadResolverFactory _workloadResolverFactory;
+
+        private string? _dotnetPath;
+        private string _userProfileDir;
+        private readonly IWorkloadResolver _workloadResolver;
+        private readonly ReleaseVersion _sdkVersion;
+        private readonly SdkFeatureBand _sdkFeatureBand;
+
+        readonly IInstaller _workloadInstaller;
+
+        public WorkloadConfigCommand(
+            ParseResult parseResult,
+            IReporter? reporter = null,
+            IWorkloadResolverFactory? workloadResolverFactory = null
+        ) : base(parseResult, CommonOptions.HiddenVerbosityOption, reporter)
+        {
+            _hasUpdateMode = parseResult.HasOption(WorkloadConfigCommandParser.UpdateMode);
+            _updateMode = parseResult.GetValue(WorkloadConfigCommandParser.UpdateMode);
+
+            _workloadResolverFactory = workloadResolverFactory ?? new WorkloadResolverFactory();
+
+            var creationResult = _workloadResolverFactory.Create();
+
+            _dotnetPath = creationResult.DotnetPath;
+            _userProfileDir = creationResult.UserProfileDir;
+            _workloadResolver = creationResult.WorkloadResolver;
+            _sdkVersion = creationResult.SdkVersion;
+
+            _sdkFeatureBand = new SdkFeatureBand(_sdkVersion);
+            _workloadInstaller = WorkloadInstallerFactory.GetWorkloadInstaller(Reporter, _sdkFeatureBand, creationResult.WorkloadResolver, Verbosity, creationResult.UserProfileDir, VerifySignatures, PackageDownloader, creationResult.DotnetPath);
+        }
+
+        public override int Execute()
+        {
+            //  When we support multiple configuration values, it would be nice if we could process and display them in the order they are passed.
+            //  It seems that the parser doesn't give us a good way to do that, however
+            if (_hasUpdateMode)
+            {
+                if (WorkloadConfigCommandParser.UpdateMode_WorkloadSet.Equals(_updateMode, StringComparison.InvariantCultureIgnoreCase))
+                {
+                    _workloadInstaller.UpdateInstallMode(_sdkFeatureBand, true);
+                }
+                else if (WorkloadConfigCommandParser.UpdateMode_Manifests.Equals(_updateMode, StringComparison.InvariantCultureIgnoreCase))
+                {
+                    _workloadInstaller.UpdateInstallMode(_sdkFeatureBand, false);
+                }
+                else if (string.IsNullOrEmpty(_updateMode))
+                {
+                    if (InstallingWorkloadCommand.ShouldUseWorkloadSetMode(_sdkFeatureBand, _dotnetPath))
+                    {
+                        Reporter.WriteLine(WorkloadConfigCommandParser.UpdateMode_WorkloadSet);
+                    }
+                    else
+                    {
+                        Reporter.WriteLine(WorkloadConfigCommandParser.UpdateMode_Manifests);
+                    }
+                }
+                else
+                {
+                    //  This should not be hit, as parser sets the accepted values and should error before getting here if the value is not valid
+                    throw new InvalidOperationException($"Invalid update mode: {_updateMode}");
+                }
+            }
+            else
+            {
+                _parseResult.ShowHelp();
+            }
+
+            return 0;
+        }
+    }
+
+}

src/Cli/dotnet/commands/dotnet-workload/config/WorkloadConfigCommandParser.cs

@@ -0,0 +1,44 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.CommandLine;
+using Microsoft.DotNet.Workloads.Workload.Config;
+
+namespace Microsoft.DotNet.Cli
+{
+    internal static class WorkloadConfigCommandParser
+    {
+        //  dotnet workload config --update-mode workload-set
+
+        public static readonly string UpdateMode_WorkloadSet = "workload-set";
+        public static readonly string UpdateMode_Manifests = "manifests";
+
+        public static readonly CliOption<string> UpdateMode = new("--update-mode")
+        {
+            Description = LocalizableStrings.UpdateModeDescription,
+            Arity = ArgumentArity.ZeroOrOne
+        };
+
+        private static readonly CliCommand Command = ConstructCommand();
+
+        public static CliCommand GetCommand()
+        {
+            return Command;
+        }
+
+        private static CliCommand ConstructCommand()
+        {
+            UpdateMode.AcceptOnlyFromAmong(UpdateMode_WorkloadSet, UpdateMode_Manifests);
+
+            CliCommand command = new("config", LocalizableStrings.CommandDescription);
+            command.Options.Add(UpdateMode);
+
+            command.SetAction(parseResult =>
+            {
+                new WorkloadConfigCommand(parseResult).Execute();
+            });
+
+            return command;
+        }
+    }
+}