Add Windows admin PATH management commands to dotnetup

src/Installer/dotnetup/Commands/ElevatedAdminPath/ElevatedAdminPathCommand.cs

@@ -0,0 +1,56 @@
+// 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 System.Runtime.InteropServices;
+using System.Runtime.Versioning;
+
+namespace Microsoft.DotNet.Tools.Bootstrapper.Commands.ElevatedAdminPath;
+
+internal class ElevatedAdminPathCommand : CommandBase
+{
+    private readonly string _operation;
+
+    public ElevatedAdminPathCommand(ParseResult result) : base(result)
+    {
+        _operation = result.GetValue(ElevatedAdminPathCommandParser.OperationArgument)!;
+    }
+
+    public override int Execute()
+    {
+        // This command only works on Windows
+        if (!OperatingSystem.IsWindows())
+        {
+            Console.Error.WriteLine("Error: The elevatedadminpath command is only supported on Windows.");
+            return 1;
+        }
+
+        // Check if running with elevated privileges
+        if (!Environment.IsPrivilegedProcess)
+        {
+            Console.Error.WriteLine("Error: This operation requires administrator privileges. Please run from an elevated command prompt.");
+            return 1;
+        }
+
+        return _operation.ToLowerInvariant() switch
+        {
+            "removedotnet" => RemoveDotnet(),
+            "adddotnet" => AddDotnet(),
+            _ => throw new InvalidOperationException($"Unknown operation: {_operation}")
+        };
+    }
+
+    [SupportedOSPlatform("windows")]
+    private int RemoveDotnet()
+    {
+        using var pathHelper = new WindowsPathHelper();
+        return pathHelper.RemoveDotnetFromAdminPath();
+    }
+
+    [SupportedOSPlatform("windows")]
+    private int AddDotnet()
+    {
+        using var pathHelper = new WindowsPathHelper();
+        return pathHelper.AddDotnetToAdminPath();
+    }
+}

src/Installer/dotnetup/Commands/ElevatedAdminPath/ElevatedAdminPathCommandParser.cs

@@ -0,0 +1,35 @@
+// 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;
+
+namespace Microsoft.DotNet.Tools.Bootstrapper.Commands.ElevatedAdminPath;
+
+internal static class ElevatedAdminPathCommandParser
+{
+    public static readonly Argument<string> OperationArgument = new("operation")
+    {
+        HelpName = "OPERATION",
+        Description = "The operation to perform: 'removedotnet' or 'adddotnet'",
+        Arity = ArgumentArity.ExactlyOne,
+    };
+
+    private static readonly Command ElevatedAdminPathCommand = ConstructCommand();
+
+    public static Command GetCommand()
+    {
+        return ElevatedAdminPathCommand;
+    }
+
+    private static Command ConstructCommand()
+    {
+        Command command = new("elevatedadminpath", "Modifies the machine-wide admin PATH (requires elevated privileges)");
+        command.Hidden = true;
+
+        command.Arguments.Add(OperationArgument);
+
+        command.SetAction(parseResult => new ElevatedAdminPathCommand(parseResult).Execute());
+
+        return command;
+    }
+}

src/Installer/dotnetup/Commands/SetInstallRoot/SetInstallRootCommand.cs

@@ -0,0 +1,219 @@
+// 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 System.Runtime.InteropServices;
+using System.Runtime.Versioning;
+
+namespace Microsoft.DotNet.Tools.Bootstrapper.Commands.SetInstallRoot;
+
+internal class SetInstallRootCommand : CommandBase
+{
+    private readonly string _installType;
+    private readonly IDotnetInstallManager _dotnetInstaller;
+
+    public SetInstallRootCommand(ParseResult result, IDotnetInstallManager? dotnetInstaller = null) : base(result)
+    {
+        _installType = result.GetValue(SetInstallRootCommandParser.InstallTypeArgument)!;
+        _dotnetInstaller = dotnetInstaller ?? new DotnetInstallManager();
+    }
+
+    public override int Execute()
+    {
+        return _installType.ToLowerInvariant() switch
+        {
+            SetInstallRootCommandParser.UserInstallType => SetUserInstallRoot(),
+            SetInstallRootCommandParser.AdminInstallType => SetAdminInstallRoot(),
+            _ => throw new InvalidOperationException($"Unknown install type: {_installType}")
+        };
+    }
+
+    [SupportedOSPlatform("windows")]
+    private bool HandleWindowsAdminPath()
+    {
+        // Check if admin PATH needs to be changed
+        if (WindowsPathHelper.AdminPathContainsProgramFilesDotnet(out var foundDotnetPaths))
+        {
+            if (foundDotnetPaths.Count == 1)
+            {
+                Console.WriteLine($"Removing {foundDotnetPaths[0]} from system PATH.");
+            }
+            else
+            {
+                Console.WriteLine("Removing the following dotnet paths from system PATH:");
+                foreach (var path in foundDotnetPaths)
+                {
+                    Console.WriteLine($"  - {path}");
+                }
+            }
+
+            if (Environment.IsPrivilegedProcess)
+            {
+                // We're already elevated, modify the admin PATH directly
+                using var pathHelper = new WindowsPathHelper();
+                pathHelper.RemoveDotnetFromAdminPath();
+            }
+            else
+            {
+                // Not elevated, shell out to elevated process
+                Console.WriteLine("Launching elevated process to modify system PATH...");
+
+                bool succeeded = WindowsPathHelper.StartElevatedProcess("elevatedadminpath removedotnet");
+                if (!succeeded)
+                {
+                    Console.Error.WriteLine("Warning: Elevation was cancelled. Admin PATH was not modified.");
+                    return false;
+                }
+            }
+        }        
+
+        return true;
+    }
+
+    private int SetUserInstallRoot()
+    {
+        // Get the default user dotnet installation path
+        string userDotnetPath = _dotnetInstaller.GetDefaultDotnetInstallPath();
+
+        Console.WriteLine($"Setting up user install root at: {userDotnetPath}");
+
+
+        // Add the user dotnet path to the user PATH
+        try
+        {
+            // On Windows, check if we need to modify the admin PATH
+            if (OperatingSystem.IsWindows())
+            {
+                if (!HandleWindowsAdminPath())
+                {
+                    //  UAC prompt was cancelled
+                    return 1;
+                }
+            }
+
+            Console.WriteLine($"Adding {userDotnetPath} to user PATH...");
+
+            var userPath = Environment.GetEnvironmentVariable("PATH", EnvironmentVariableTarget.User) ?? string.Empty;
+            var pathEntries = userPath.Split(Path.PathSeparator, StringSplitOptions.RemoveEmptyEntries).ToList();
+
+            // Check if the user dotnet path is already in the user PATH
+            bool alreadyExists = pathEntries.Any(entry =>
+                Path.TrimEndingDirectorySeparator(entry).Equals(
+                    Path.TrimEndingDirectorySeparator(userDotnetPath),
+                    StringComparison.OrdinalIgnoreCase));
+
+            if (!alreadyExists)
+            {
+                // Add to the beginning of PATH
+                pathEntries.Insert(0, userDotnetPath);
+                var newUserPath = string.Join(Path.PathSeparator, pathEntries);
+                Environment.SetEnvironmentVariable("PATH", newUserPath, EnvironmentVariableTarget.User);
+                Console.WriteLine($"Successfully added {userDotnetPath} to user PATH.");
+            }
+            else
+            {
+                Console.WriteLine($"User dotnet path is already in user PATH.");
+            }
+
+            // Set DOTNET_ROOT for user
+            Environment.SetEnvironmentVariable("DOTNET_ROOT", userDotnetPath, EnvironmentVariableTarget.User);
+            Console.WriteLine($"Set DOTNET_ROOT to {userDotnetPath}");
+
+            Console.WriteLine("User install root configured successfully.");
+            Console.WriteLine("Note: You may need to restart your terminal or application for the changes to take effect.");
+
+            return 0;
+        }
+        catch (Exception ex)
+        {
+            Console.Error.WriteLine($"Error: Failed to configure user install root: {ex.ToString()}");
+            return 1;
+        }
+    }
+
+    private int SetAdminInstallRoot()
+    {
+        Console.WriteLine("Setting up admin install root...");
+
+        // On Windows, add Program Files dotnet path back to admin PATH and remove user settings
+        if (OperatingSystem.IsWindows())
+        {
+            try
+            {
+                // Add Program Files dotnet path back to admin PATH
+                if (Environment.IsPrivilegedProcess)
+                {
+                    // We're already elevated, modify the admin PATH directly
+                    Console.WriteLine("Running with elevated privileges. Modifying admin PATH...");
+                    using var pathHelper = new WindowsPathHelper();
+                    pathHelper.AddDotnetToAdminPath();
+                }
+                else
+                {
+                    // Not elevated, shell out to elevated process
+                    Console.WriteLine("Launching elevated process to modify admin PATH...");
+                    try
+                    {
+                        bool succeeded = WindowsPathHelper.StartElevatedProcess("elevatedadminpath adddotnet");
+                        if (!succeeded)
+                        {
+                            Console.Error.WriteLine("Warning: Elevation was cancelled. Admin PATH was not modified.");
+                            return 1;
+                        }
+                    }
+                    catch (InvalidOperationException ex)
+                    {
+                        Console.Error.WriteLine($"Error: Failed to modify admin PATH: {ex.Message}");
+                        Console.Error.WriteLine("You may need to manually add the Program Files dotnet path to the system PATH.");
+                        return 1;
+                    }
+                }
+
+                // Get the user dotnet installation path
+                string userDotnetPath = _dotnetInstaller.GetDefaultDotnetInstallPath();
+
+                // Remove user dotnet path from user PATH
+                Console.WriteLine($"Removing {userDotnetPath} from user PATH...");
+                var userPath = Environment.GetEnvironmentVariable("PATH", EnvironmentVariableTarget.User) ?? string.Empty;
+                var pathEntries = userPath.Split(Path.PathSeparator, StringSplitOptions.RemoveEmptyEntries).ToList();
+
+                // Remove entries that match the user dotnet path
+                int removedCount = pathEntries.RemoveAll(entry =>
+                    Path.TrimEndingDirectorySeparator(entry).Equals(
+                        Path.TrimEndingDirectorySeparator(userDotnetPath),
+                        StringComparison.OrdinalIgnoreCase));
+
+                if (removedCount > 0)
+                {
+                    var newUserPath = string.Join(Path.PathSeparator, pathEntries);
+                    Environment.SetEnvironmentVariable("PATH", newUserPath, EnvironmentVariableTarget.User);
+                    Console.WriteLine($"Successfully removed {userDotnetPath} from user PATH.");
+                }
+                else
+                {
+                    Console.WriteLine($"User dotnet path was not found in user PATH.");
+                }
+
+                // Unset user DOTNET_ROOT environment variable
+                Console.WriteLine("Unsetting user DOTNET_ROOT environment variable...");
+                Environment.SetEnvironmentVariable("DOTNET_ROOT", null, EnvironmentVariableTarget.User);
+                Console.WriteLine("Successfully unset DOTNET_ROOT.");
+
+                Console.WriteLine("Admin install root configured successfully.");
+                Console.WriteLine("Note: You may need to restart your terminal or application for the changes to take effect.");
+
+                return 0;
+            }
+            catch (Exception ex)
+            {
+                Console.Error.WriteLine($"Error: Failed to configure admin install root: {ex.Message}");
+                return 1;
+            }
+        }
+        else
+        {
+            Console.Error.WriteLine("Error: Admin install root is only supported on Windows.");
+            return 1;
+        }
+    }
+}

src/Installer/dotnetup/Commands/SetInstallRoot/SetInstallRootCommandParser.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;
+
+namespace Microsoft.DotNet.Tools.Bootstrapper.Commands.SetInstallRoot;
+
+internal static class SetInstallRootCommandParser
+{
+    public const string UserInstallType = "user";
+    public const string AdminInstallType = "admin";
+
+    public static readonly Argument<string> InstallTypeArgument = CreateInstallTypeArgument();
+
+    private static Argument<string> CreateInstallTypeArgument()
+    {
+        var argument = new Argument<string>("installtype")
+        {
+            HelpName = "INSTALL_TYPE",
+            Description = "The type of installation root to set: 'user' or 'admin'",
+            Arity = ArgumentArity.ExactlyOne,
+        };
+        argument.AcceptOnlyFromAmong(UserInstallType, AdminInstallType);
+        return argument;
+    }
+
+    private static readonly Command SetInstallRootCommand = ConstructCommand();
+
+    public static Command GetCommand()
+    {
+        return SetInstallRootCommand;
+    }
+
+    private static Command ConstructCommand()
+    {
+        Command command = new("setinstallroot", "Sets the dotnet installation root");
+
+        command.Arguments.Add(InstallTypeArgument);
+
+        command.SetAction(parseResult => new SetInstallRootCommand(parseResult).Execute());
+
+        return command;
+    }
+}

src/Installer/dotnetup/Parser.cs

@@ -9,6 +9,8 @@
 using Microsoft.DotNet.Tools.Bootstrapper.Commands.Sdk;
 using Microsoft.DotNet.Tools.Bootstrapper.Commands.Sdk.Install;
 using Microsoft.DotNet.Tools.Bootstrapper.Commands.Sdk.Update;
+using Microsoft.DotNet.Tools.Bootstrapper.Commands.ElevatedAdminPath;
+using Microsoft.DotNet.Tools.Bootstrapper.Commands.SetInstallRoot;
 
 namespace Microsoft.DotNet.Tools.Bootstrapper
 {
@@ -38,6 +40,8 @@ private static RootCommand ConfigureCommandLine(RootCommand rootCommand)
             rootCommand.Subcommands.Add(SdkCommandParser.GetCommand());
             rootCommand.Subcommands.Add(SdkInstallCommandParser.GetRootInstallCommand());
             rootCommand.Subcommands.Add(SdkUpdateCommandParser.GetRootUpdateCommand());
+            rootCommand.Subcommands.Add(ElevatedAdminPathCommandParser.GetCommand());
+            rootCommand.Subcommands.Add(SetInstallRootCommandParser.GetCommand());
 
             return rootCommand;
         }