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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
#if RUNTIME_TYPE_NETCORE
using System.IO;
using Microsoft.Build.Shared;
#endif
namespace Microsoft.Build.BackEnd;
internal static class CurrentHost
{
#if RUNTIME_TYPE_NETCORE
private static string? s_currentHost;
#endif
/// <summary>
/// Identify the .NET host of the current process.
/// </summary>
/// <returns>The full path to the executable hosting the current process, or null if running on Full Framework on Windows.</returns>
public static string? GetCurrentHost()
{
#if RUNTIME_TYPE_NETCORE
if (s_currentHost == null)
{
string dotnetExeName = NativeMethodsShared.IsWindows ? "dotnet.exe" : "dotnet";
string dotnetExe = Path.Combine(FileUtilities.GetFolderAbove(BuildEnvironmentHelper.Instance.CurrentMSBuildToolsDirectory, 2),
dotnetExeName);
if (File.Exists(dotnetExe))
{
s_currentHost = dotnetExe;
}
else
{
if (EnvironmentUtilities.ProcessPath is string processPath &&
Path.GetFileName(processPath) == dotnetExeName)
{
// If the current process is already running in a general-purpose host, use its path.
s_currentHost = processPath;
}
else
{
// Otherwise, we don't know the host. Try to infer it from the current runtime, which will be something like
// "C:\Program Files\dotnet\shared\Microsoft.NETCore.App\9.0.6\" on Windows.
// ^4 ^3 ^2 ^1
dotnetExe = Path.Combine(FileUtilities.GetFolderAbove(System.Runtime.InteropServices.RuntimeEnvironment.GetRuntimeDirectory(), 4),
dotnetExeName);
if (File.Exists(dotnetExe))
{
s_currentHost = dotnetExe;
}
else
{
ErrorUtilities.ThrowInternalErrorUnreachable();
}
}
}
}
return s_currentHost;
#else
return null;
#endif
}
}
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