feat(launching): launch the native BGFX client against retail archives

GenHub/GenHub.Tests/GenHub.Tests.Core/Features/GameProfiles/BoundedErrorBufferTests.cs

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+using System.Reflection;
+using GenHub.Features.GameProfiles.Infrastructure;
+using Xunit;
+
+namespace GenHub.Tests.Core.Features.GameProfiles;
+
+/// <summary>
+/// Tests for the bounded stderr capture used to explain a failed launch.
+/// </summary>
+/// <remarks>
+/// The buffer is a private nested type; it is exercised through reflection rather than
+/// being made public, because it is an implementation detail of process management and
+/// its behaviour only matters through the diagnostics it produces.
+/// </remarks>
+public class BoundedErrorBufferTests
+{
+    private static readonly Type BufferType =
+        typeof(GameProcessManager).GetNestedType("BoundedErrorBuffer", BindingFlags.NonPublic)!;
+
+    /// <summary>
+    /// The startup context is where the cause usually is, so the first lines must survive
+    /// even when far more output follows than the buffer retains.
+    /// </summary>
+    [Fact]
+    public void Append_RetainsBothTheHeadAndTheTail()
+    {
+        var buffer = CreateBuffer();
+
+        Append(buffer, "dyld: library not loaded");
+        for (var i = 0; i < 200; i++)
+        {
+            Append(buffer, $"noise line {i}");
+        }
+
+        Append(buffer, "Abort trap: 6");
+
+        var text = buffer.ToString()!;
+
+        Assert.Contains("dyld: library not loaded", text);
+        Assert.Contains("Abort trap: 6", text);
+        Assert.Contains("omitted", text);
+    }
+
+    /// <summary>
+    /// A single pathological line must not be retained in full.
+    /// </summary>
+    [Fact]
+    public void Append_TruncatesAnOverlongLine()
+    {
+        var buffer = CreateBuffer();
+
+        Append(buffer, new string('x', 10_000));
+
+        var text = buffer.ToString()!;
+
+        Assert.Contains("line truncated", text);
+        Assert.True(text.Length < 10_000, "The overlong line was retained in full.");
+    }
+
+    /// <summary>
+    /// A null line is the framework's end-of-stream signal, not content.
+    /// </summary>
+    [Fact]
+    public void Append_TreatsNullAsEndOfStreamRatherThanContent()
+    {
+        var buffer = CreateBuffer();
+
+        Assert.False(EndOfStreamReached(buffer));
+
+        Append(buffer, "something failed");
+        Append(buffer, null);
+
+        Assert.True(EndOfStreamReached(buffer));
+        Assert.Equal("something failed", buffer.ToString());
+    }
+
+    /// <summary>
+    /// Total retained output stays bounded regardless of how much arrives.
+    /// </summary>
+    [Fact]
+    public void Append_BoundsTotalRetainedOutput()
+    {
+        var buffer = CreateBuffer();
+
+        for (var i = 0; i < 5_000; i++)
+        {
+            Append(buffer, new string('y', 500));
+        }
+
+        Assert.True(
+            buffer.ToString()!.Length < 128 * 1024,
+            "Retained output grew beyond the cap.");
+    }
+
+    private static object CreateBuffer() => Activator.CreateInstance(BufferType, nonPublic: true)!;
+
+    private static void Append(object buffer, string? line) =>
+        BufferType.GetMethod("Append", BindingFlags.NonPublic | BindingFlags.Instance)!
+            .Invoke(buffer, [line]);
+
+    private static bool EndOfStreamReached(object buffer) =>
+        (bool)BufferType.GetProperty("EndOfStreamReached", BindingFlags.NonPublic | BindingFlags.Instance)!
+            .GetValue(buffer)!;
+}

GenHub/GenHub.Tests/GenHub.Tests.Core/Features/GameProfiles/NativeClientLaunchCollection.cs

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+using Xunit;
+
+namespace GenHub.Tests.Core.Features.GameProfiles;
+
+/// <summary>
+/// Serialises the tests that launch a real native game client.
+/// <para>
+/// The engine enforces a single running instance, so two of these in parallel produce a
+/// spurious failure: the second launch is refused by the first. That is engine behaviour
+/// rather than a test defect, and it has a product consequence — GenHub cannot run two
+/// native profiles simultaneously.
+/// </para>
+/// </summary>
+[CollectionDefinition(Name, DisableParallelization = true)]
+public class NativeClientLaunchCollection
+{
+    /// <summary>The xUnit collection name.</summary>
+    public const string Name = "Native client launch";
+}

GenHub/GenHub.Tests/GenHub.Tests.Core/Features/GameProfiles/NativeClientLaunchIntegrationTests.cs

@@ -0,0 +1,177 @@
+using System;
+using System.IO;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Threading.Tasks;
+using GenHub.Core.Models.Launching;
+using GenHub.Core.Models.Manifest;
+using GenHub.Features.GameProfiles.Infrastructure;
+using Microsoft.Extensions.Logging.Abstractions;
+using Xunit;
+
+namespace GenHub.Tests.Core.Features.GameProfiles;
+
+/// <summary>
+/// End-to-end launch of a real native Zero Hour client through GenHub's own process
+/// manager, rather than a stand-in script.
+/// <para>
+/// Everything else in the native-client work is verified against synthetic binaries.
+/// This is the one test that answers the actual question: can GenHub start the real
+    /// engine, against real retail data, and have it remain running.
+/// </para>
+/// <para>
+/// Skipped unless a native install is present, so CI and other machines stay green.
+/// Point <c>GENHUB_NATIVE_CLIENT_DIR</c> at an install directory to run it; the default
+/// is the deploy script's own default location.
+/// </para>
+/// </summary>
+[Collection(NativeClientLaunchCollection.Name)]
+public class NativeClientLaunchIntegrationTests
+{
+    private const string EnvironmentOverride = "GENHUB_NATIVE_CLIENT_DIR";
+    private const string BinaryName = "generalszh";
+
+    /// <summary>How long the engine must stay up to count as a successful launch.</summary>
+    private static readonly TimeSpan LaunchSettleTime = TimeSpan.FromSeconds(12);
+
+    private readonly GameProcessManager _processManager = new(NullLogger<GameProcessManager>.Instance);
+
+    private static string? NativeClientDirectory
+    {
+        get
+        {
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                return null;
+            }
+
+            var configured = Environment.GetEnvironmentVariable(EnvironmentOverride);
+            if (!string.IsNullOrWhiteSpace(configured))
+            {
+                return Directory.Exists(configured) ? configured : null;
+            }
+
+            var home = Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
+            var defaultDirectory = Path.Combine(home, "TheSuperHackers", "GeneralsZH");
+
+            return File.Exists(Path.Combine(defaultDirectory, BinaryName)) ? defaultDirectory : null;
+        }
+    }
+
+    /// <summary>
+    /// Launches the engine with the install directory as the working directory, exactly
+    /// as a workspace launch would, and requires it to survive startup.
+    /// <para>
+    /// Windowed mode is requested so a test run cannot take over the display.
+    /// </para>
+    /// </summary>
+    /// <returns>A task representing the asynchronous test.</returns>
+    [Fact]
+    public async Task RealNativeClient_LaunchesThroughGameProcessManager()
+    {
+        var installDirectory = NativeClientDirectory;
+        if (installDirectory is null)
+        {
+            return;
+        }
+
+        var configuration = new GameLaunchConfiguration
+        {
+            ExecutablePath = Path.Combine(installDirectory, BinaryName),
+            WorkingDirectory = installDirectory,
+            Arguments = new() { ["-win"] = string.Empty },
+        };
+
+        var result = await _processManager.StartProcessAsync(configuration);
+
+        Assert.True(result.Success, $"Launch failed: {string.Join(" ", result.Errors)}");
+        Assert.NotNull(result.Data);
+
+        try
+        {
+            // StartProcessAsync only waits out the launcher-detection delay. Give the
+            // engine long enough to fail the way it fails for real: mounting archives and
+            // initialising the renderer, both of which happen after the process exists.
+            await Task.Delay(LaunchSettleTime);
+
+            var info = await _processManager.GetProcessInfoAsync(result.Data!.ProcessId);
+            const string failureMessage =
+                "The engine started and then exited during initialisation. That is the failure "
+                + "mode this work exists to make visible; check the captured output.";
+
+            Assert.True(info.Success, failureMessage);
+        }
+        finally
+        {
+            await _processManager.TerminateProcessAsync(result.Data!.ProcessId);
+        }
+    }
+
+    /// <summary>
+    /// The working directory is load-bearing, not cosmetic. The engine discovers its
+    /// <c>.big</c> archives relative to the current directory, so launching from anywhere
+    /// else fails within about a second — it finds no archives, or worse, mounts unrelated
+    /// ones it happens to encounter.
+    /// <para>
+    /// This is why <c>WorkspaceStrategyBase</c> sets <c>WorkingDirectory</c> to the
+    /// workspace root, and why a native client cannot simply be launched in place.
+    /// </para>
+    /// </summary>
+    /// <returns>A task representing the asynchronous test.</returns>
+    [Fact]
+    public async Task RealNativeClient_RequiresItsInstallDirectoryAsWorkingDirectory()
+    {
+        var installDirectory = NativeClientDirectory;
+        if (installDirectory is null)
+        {
+            return;
+        }
+
+        var isolatedDirectory = Path.Combine(
+            Path.GetTempPath(),
+            $"genhub-wrong-cwd-{Guid.NewGuid():N}");
+        Directory.CreateDirectory(isolatedDirectory);
+
+        try
+        {
+            var configuration = new GameLaunchConfiguration
+            {
+                ExecutablePath = Path.Combine(installDirectory, BinaryName),
+                WorkingDirectory = isolatedDirectory,
+                Arguments = new() { ["-win"] = string.Empty },
+            };
+
+            var result = await _processManager.StartProcessAsync(configuration);
+
+            if (result.Success && result.Data is not null)
+            {
+                await Task.Delay(TimeSpan.FromSeconds(6));
+                var info = await _processManager.GetProcessInfoAsync(result.Data.ProcessId);
+                await _processManager.TerminateProcessAsync(result.Data.ProcessId);
+                const string failureMessage =
+                    "The engine survived being launched from an unrelated working directory. If it "
+                    + "no longer resolves archives relative to the current directory, the workspace "
+                    + "model can be relaxed.";
+
+                Assert.False(info.Success, failureMessage);
+                return;
+            }
+
+            // The expected path: it dies during startup and the failure names the reason
+            // rather than reporting a bare exit code.
+            Assert.False(result.Success);
+            Assert.Contains("exited immediately", string.Join(" ", result.Errors), StringComparison.OrdinalIgnoreCase);
+        }
+        finally
+        {
+            try
+            {
+                Directory.Delete(isolatedDirectory, recursive: true);
+            }
+            catch (IOException)
+            {
+                // Cleanup failure is not a test failure.
+            }
+        }
+    }
+}