Port fixes for 1.26.2

CHANGELOG.md

@@ -1,6 +1,11 @@
 # Changelog
 All changes to the project will be documented in this file.
 
+## [1.26.2] - 2017-11-09
+
+* Fixed issue with discovering MSBuild under Mono even when it is missing. ([#1011](https://github.com/OmniSharp/omnisharp-roslyn/issues/1011))
+* Fixed issue to not use Visual Studio 2017 MSBuild if it is from VS 2017 RTM. ([#1014](https://github.com/OmniSharp/omnisharp-roslyn/issues/1014))
+
 ## [1.27.0] - 2017-11-07
 
 * Significant changes made to the MSBuild project system that fix several issues. (PR: [#1003](https://github.com/OmniSharp/omnisharp-roslyn/pull/1003))

src/OmniSharp.Abstractions/Utilities/Platform.cs

@@ -0,0 +1,190 @@
+using System;
+using System.IO;
+
+namespace OmniSharp.Utilities
+{
+    public enum OperatingSystem
+    {
+        Unknown,
+        Windows,
+        MacOS,
+        Linux
+    }
+
+    public enum Architecture
+    {
+        Unknown,
+        x86,
+        x64
+    }
+
+    public sealed class Platform
+    {
+        public static Platform Current { get; } = GetCurrentPlatform();
+
+        public OperatingSystem OperatingSystem { get; }
+        public Architecture Architecture { get; }
+        public Version Version { get; }
+        public string LinuxDistributionName { get; }
+
+        private Platform(
+            OperatingSystem os = OperatingSystem.Unknown,
+            Architecture architecture = Architecture.Unknown,
+            Version version = null,
+            string linuxDistributionName = null)
+        {
+            OperatingSystem = os;
+            Architecture = architecture;
+            Version = version ?? new Version(0, 0);
+            LinuxDistributionName = linuxDistributionName ?? string.Empty;
+        }
+
+        public override string ToString()
+            => !string.IsNullOrEmpty(LinuxDistributionName)
+                ? $"{LinuxDistributionName} {Version} ({Architecture})"
+                : $"{OperatingSystem} {Version} ({Architecture})";
+
+        private static Platform GetCurrentPlatform()
+        {
+            var os = OperatingSystem.Unknown;
+            var architecture = Architecture.Unknown;
+
+            // Simple check to see if this is Windows. Note: this check is derived from the fact that the
+            // System.PlatformID enum has six values (https://msdn.microsoft.com/en-us/library/3a8hyw88.aspx)
+            //
+            //   * Win32 = 0
+            //   * Win32Windows = 1
+            //   * Win32NT = 2
+            //   * WinCE = 3
+            //   * Unix = 4
+            //   * Xbox = 5
+            //   * MacOSX = 6
+            //
+            // Essentially, we check to see if this is one of the "windows" values or Xbox. The other values
+            // can be a little unreliable, so we'll shell out to 'uname' for Linux and macOS.
+
+            var platformId = (int)Environment.OSVersion.Platform;
+            if (platformId <= 3 || platformId == 5)
+            {
+                os = OperatingSystem.Windows;
+
+                if (Environment.GetEnvironmentVariable("PROCESSOR_ARCHITECTURE") == "x86" &&
+                    Environment.GetEnvironmentVariable("PROCESSOR_ARCHITEW6432") == null)
+                {
+                    architecture = Architecture.x86;
+                }
+                else
+                {
+                    architecture = Architecture.x64;
+                }
+            }
+            else
+            {
+                // If this is not Windows, run 'uname' on Bash to get the OS name and architecture.
+                var output = RunOnBashAndCaptureOutput("uname", "-s -m");
+                if (string.IsNullOrEmpty(output))
+                {
+                    return new Platform();
+                }
+
+                var values = output.Split(' ');
+                var osName = values[0];
+                var osArch = values[1];
+
+                os = osName.Equals("Darwin", StringComparison.OrdinalIgnoreCase)
+                    ? OperatingSystem.MacOS
+                    : OperatingSystem.Linux;
+
+                if (osArch.Equals("x86", StringComparison.OrdinalIgnoreCase))
+                {
+                    architecture = Architecture.x86;
+                }
+                else if (osArch.Equals("x86_64", StringComparison.OrdinalIgnoreCase))
+                {
+                    architecture = Architecture.x64;
+                }
+                else
+                {
+                    architecture = Architecture.Unknown;
+                }
+            }
+
+            switch (os)
+            {
+                case OperatingSystem.Windows:
+                    return new Platform(os, architecture, Environment.OSVersion.Version);
+                case OperatingSystem.MacOS:
+                    return new Platform(os, architecture, GetMacOSVersion());
+                case OperatingSystem.Linux:
+                    ReadDistroNameAndVersion(out var distroName, out var version);
+                    return new Platform(os, architecture, version, distroName);
+
+                default:
+                    throw new NotSupportedException("Could not detect the current platform.");
+            }
+        }
+
+        private static Version GetMacOSVersion()
+        {
+            var versionText = RunOnBashAndCaptureOutput("sw_vers", "-productVersion");
+            return ParseVersion(versionText);
+        }
+
+        private static void ReadDistroNameAndVersion(out string distroName, out Version version)
+        {
+            // Details: https://www.freedesktop.org/software/systemd/man/os-release.html
+            var lines = File.ReadAllLines("/etc/os-release");
+
+            distroName = null;
+            version = null;
+
+            foreach (var line in lines)
+            {
+                var equalsIndex = line.IndexOf('=');
+                if (equalsIndex >= 0)
+                {
+                    var key = line.Substring(0, equalsIndex).Trim();
+                    var value = line.Substring(equalsIndex + 1).Trim();
+                    value = value.Trim('"');
+
+                    if (key == "ID")
+                    {
+                        distroName = value;
+                    }
+                    else if (key == "VERSION_ID")
+                    {
+                        version = ParseVersion(value);
+                    }
+
+                    if (distroName != null && version != null)
+                    {
+                        break;
+                    }
+                }
+            }
+
+            if (distroName == null)
+            {
+                distroName = "Unknown";
+            }
+        }
+
+        private static Version ParseVersion(string versionText)
+        {
+            if (!versionText.Contains("."))
+            {
+                versionText += ".0";
+            }
+
+            if (Version.TryParse(versionText, out var version))
+            {
+                return version;
+            }
+
+            return null;
+        }
+
+        private static string RunOnBashAndCaptureOutput(string fileName, string arguments)
+            => ProcessHelper.RunAndCaptureOutput("/bin/bash", $"-c '{fileName} {arguments}'");
+    }
+}

src/OmniSharp.Host/CompositionHostBuilder.cs

@@ -53,20 +53,13 @@ public CompositionHost Build()
             var fileSystemWatcher = new ManualFileSystemWatcher();
             var metadataHelper = new MetadataHelper(assemblyLoader);
 
+            var logger = loggerFactory.CreateLogger<CompositionHostBuilder>();
+
             // We must register an MSBuild instance before composing MEF to ensure that
             // our AssemblyResolve event is hooked up first.
             var msbuildLocator = _serviceProvider.GetRequiredService<IMSBuildLocator>();
-            var instances = msbuildLocator.GetInstances();
-            var instance = instances.FirstOrDefault();
-            if (instance != null)
-            {
-                msbuildLocator.RegisterInstance(instance);
-            }
-            else
-            {
-                var logger = loggerFactory.CreateLogger<CompositionHostBuilder>();
-                logger.LogError("Could not locate MSBuild instance to register with OmniSharp");
-            }
+
+            RegisterMSBuildInstance(msbuildLocator, logger);
 
             config = config
                 .WithProvider(MefValueProvider.From(_serviceProvider))
@@ -94,6 +87,43 @@ public CompositionHost Build()
             return config.CreateContainer();
         }
 
+        private static void RegisterMSBuildInstance(IMSBuildLocator msbuildLocator, ILogger logger)
+        {
+            MSBuildInstance instanceToRegister = null;
+            var invalidVSFound = false;
+
+            foreach (var instance in msbuildLocator.GetInstances())
+            {
+                if (instance.IsInvalidVisualStudio())
+                {
+                    invalidVSFound = true;
+                }
+                else
+                {
+                    instanceToRegister = instance;
+                    break;
+                }
+            }
+
+
+            if (instanceToRegister != null)
+            {
+                // Did we end up choosing the standalone MSBuild because there was an invalid Visual Studio?
+                // If so, provide a helpful message to the user.
+                if (invalidVSFound && instanceToRegister.DiscoveryType == DiscoveryType.StandAlone)
+                {
+                    logger.LogWarning(@"It looks like you have Visual Studio 2017 RTM installed.
+Try updating Visual Studio 2017 to the most recent release to enable better MSBuild support.");
+                }
+
+                msbuildLocator.RegisterInstance(instanceToRegister);
+            }
+            else
+            {
+                logger.LogError("Could not locate MSBuild instance to register with OmniSharp");
+            }
+        }
+
         private static IEnumerable<Type> SafeGetTypes(Assembly a)
         {
             try

src/OmniSharp.Host/MSBuild/Discovery/Extensions.cs

@@ -0,0 +1,13 @@
+namespace OmniSharp.MSBuild.Discovery
+{
+    internal static class Extensions
+    {
+        public static bool IsInvalidVisualStudio(this MSBuildInstance instance)
+            // MSBuild from Visual Studio 2017 RTM cannot be used.
+            => instance.Version.Major == 15
+            && instance.Version.Minor == 0
+            && (instance.DiscoveryType == DiscoveryType.DeveloperConsole
+                || instance.DiscoveryType == DiscoveryType.VisualStudioSetup);
+
+    }
+}

src/OmniSharp.Host/MSBuild/Discovery/Providers/MonoInstanceProvider.cs

@@ -82,6 +82,22 @@ public override ImmutableArray<MSBuildInstance> GetInstances()
                 return NoInstances;
             }
 
+            // Look for Microsoft.Build.dll in the tools path. If it isn't there, this is likely a Mono layout on Linux
+            // where the 'msbuild' package has not been installed.
+            var microsoftBuildPath = Path.Combine(toolsPath, "Microsoft.Build.dll");
+            if (!File.Exists(microsoftBuildPath))
+            {
+                Logger.LogDebug($"Mono MSBuild could not be used because '{microsoftBuildPath}' does not exist.");
+
+                if (Platform.Current.OperatingSystem == Utilities.OperatingSystem.Linux)
+                {
+                    Logger.LogWarning(@"It looks like you have Mono 5.2.0 or greater installed but MSBuild could not be found.
+Try installing MSBuild into Mono (e.g. 'sudo apt-get install msbuild') to enable better MSBuild support.");
+                }
+
+                return NoInstances;
+            }
+
             var propertyOverrides = ImmutableDictionary.CreateBuilder<string, string>(StringComparer.OrdinalIgnoreCase);
 
             var localMSBuildPath = FindLocalMSBuildDirectory();

src/OmniSharp.Http/Startup.cs

@@ -9,9 +9,8 @@
 using OmniSharp.Eventing;
 using OmniSharp.Http.Middleware;
 using OmniSharp.Options;
-using OmniSharp.Roslyn;
-using OmniSharp.Services;
 using OmniSharp.Stdio.Services;
+using OmniSharp.Utilities;
 
 namespace OmniSharp.Http
 {
@@ -52,6 +51,7 @@ public void Configure(
         {
             var workspace = _compositionHost.GetExport<OmniSharpWorkspace>();
             var logger = loggerFactory.CreateLogger<Startup>();
+
             loggerFactory.AddConsole((category, level) =>
             {
                 if (HostHelpers.LogFilter(category, level, _environment)) return true;
@@ -64,6 +64,8 @@ public void Configure(
                 return false;
             });
 
+            logger.LogInformation($"Starting OmniSharp on {Platform.Current}");
+
             app.UseRequestLogging();
             app.UseExceptionHandler("/error");
             app.UseMiddleware<EndpointMiddleware>(_compositionHost);