Handle SIGTERM exit code #6526 (#8294)

src/Hosting/Hosting/src/Internal/WebHostLifetime.cs

@@ -13,6 +13,7 @@ namespace Microsoft.AspNetCore.Hosting.Internal
         private readonly string _shutdownMessage;
 
         private bool _disposed = false;
+        private bool _exitedGracefully = false;
 
         public WebHostLifetime(CancellationTokenSource cts, ManualResetEventSlim resetEvent, string shutdownMessage)
         {
@@ -24,6 +25,11 @@ namespace Microsoft.AspNetCore.Hosting.Internal
             Console.CancelKeyPress += CancelKeyPress;
         }
 
+        internal void SetExitedGracefully()
+        {
+            _exitedGracefully = true;
+        }
+
         public void Dispose()
         {
             if (_disposed)
@@ -46,6 +52,12 @@ namespace Microsoft.AspNetCore.Hosting.Internal
         private void ProcessExit(object sender, EventArgs eventArgs)
         {
             Shutdown();
+            if (_exitedGracefully)
+            {
+                // On Linux if the shutdown is triggered by SIGTERM then that's signaled with the 143 exit code.
+                // Suppress that since we shut down gracefully. https://github.com/aspnet/AspNetCore/issues/6526
+                Environment.ExitCode = 0;
+            }
         }
 
         private void Shutdown()

src/Hosting/Hosting/src/WebHostExtensions.cs

@@ -49,6 +49,7 @@ namespace Microsoft.AspNetCore.Hosting
                     try
                     {
                         await host.WaitForTokenShutdownAsync(cts.Token);
+                        lifetime.SetExitedGracefully();
                     }
                     finally
                     {
@@ -91,6 +92,7 @@ namespace Microsoft.AspNetCore.Hosting
                     try
                     {
                         await host.RunAsync(cts.Token, "Application started. Press Ctrl+C to shut down.");
+                        lifetime.SetExitedGracefully();
                     }
                     finally
                     {

src/Hosting/test/FunctionalTests/ShutdownTests.cs

@@ -28,7 +28,6 @@ namespace Microsoft.AspNetCore.Hosting.FunctionalTests
         [ConditionalFact]
         [OSSkipCondition(OperatingSystems.Windows)]
         [OSSkipCondition(OperatingSystems.MacOSX)]
-        [OSSkipCondition(OperatingSystems.Linux)] // https://github.com/aspnet/AspNetCore-Internal/issues/1687
         public async Task ShutdownTestRun()
         {
             await ExecuteShutdownTest(nameof(ShutdownTestRun), "Run");