[tracing] fix bundle detection for check-process for AAS

tracer/src/Datadog.Trace.Tools.dd_dotnet/Checks/ProcessBasicCheck.cs

@@ -21,6 +21,8 @@ internal class ProcessBasicCheck
     {
         internal const string ClsidKey = @"SOFTWARE\Classes\CLSID\" + Utils.Profilerid + @"\InprocServer32";
         internal const string Clsid32Key = @"SOFTWARE\Classes\Wow6432Node\CLSID\" + Utils.Profilerid + @"\InprocServer32";
+        private const string AzureAppServiceSiteNameKey = "WEBSITE_SITE_NAME";
+        internal const string AzureAppServiceRootPath = "/home/site/wwwroot";
 
         public static bool Run(ProcessInfo process, IRegistryService? registryService = null)
         {
@@ -189,9 +191,10 @@ public static bool Run(ProcessInfo process, IRegistryService? registryService =
             process.EnvironmentVariables.TryGetValue(corProfilerPathKey, out var corProfilerPathValue);
             process.EnvironmentVariables.TryGetValue(corProfilerPathKey32, out var corProfilerPathValue32);
             process.EnvironmentVariables.TryGetValue(corProfilerPathKey64, out var corProfilerPathValue64);
+            var isAzureAppService = process.EnvironmentVariables.TryGetValue(AzureAppServiceSiteNameKey, out _);
 
             string?[] valuesToCheck = { corProfilerPathValue, corProfilerPathValue32, corProfilerPathValue64 };
-            var isTracingUsingBundle = TracingWithBundle(valuesToCheck, process);
+            var isTracingUsingBundle = TracingWithBundle(valuesToCheck, process, isAzureAppService);
 
             if (!ok && isTracingUsingBundle)
             {
@@ -629,9 +632,8 @@ private static bool ParseBooleanConfigurationValue(string value)
                 or "1";
         }
 
-        private static bool TracingWithBundle(string?[] profilerPathValues, ProcessInfo process)
+        internal static bool TracingWithBundle(string?[] profilerPathValues, ProcessInfo process, bool isAzureAppService)
         {
-            // Get the file path of the main module (the .exe file)
             string? filePath = process.MainModule;
             string? directoryPath = Path.GetDirectoryName(filePath);
 
@@ -653,6 +655,10 @@ private static bool TracingWithBundle(string?[] profilerPathValues, ProcessInfo
                     {
                         return true;
                     }
+                    else if (isAzureAppService && profilerPath is not null && profilerPath.Equals(AzureAppServiceRootPath + bundleSetupEnding, StringComparison.OrdinalIgnoreCase))
+                    {
+                        return true;
+                    }
                 }
             }
 

tracer/test/Datadog.Trace.Tools.dd_dotnet.IntegrationTests/Checks/ProcessBasicChecksTests.cs

@@ -45,6 +45,55 @@ public ProcessBasicChecksTests(ITestOutputHelper output)
     {
     }
 
+    [SkippableTheory]
+    [InlineData("/home/site/wwwroot/datadog/linux-x64/Datadog.Trace.ClrProfiler.Native.so")]
+    [InlineData("/home/site/wwwroot/datadog/linux-musl-x64/Datadog.Trace.ClrProfiler.Native.so")]
+    [InlineData("/home/site/wwwroot/datadog/linux-arm64/Datadog.Trace.ClrProfiler.Native.so")]
+    [InlineData("/home/site/wwwroot/datadog/linux-musl-arm64/Datadog.Trace.ClrProfiler.Native.so")]
+    public void DetectsBundleInAzureAppServiceRootWhenMainModuleIsDotnet(string profilerPath)
+    {
+        SkipOn.AllExcept(SkipOn.PlatformValue.Linux);
+
+        var environmentVariables = new Dictionary<string, string>
+        {
+            ["WEBSITE_SITE_NAME"] = "app",
+            ["CORECLR_PROFILER"] = Utils.Profilerid,
+            ["CORECLR_ENABLE_PROFILING"] = "1",
+            ["CORECLR_PROFILER_PATH"] = profilerPath
+        };
+        var process = new ProcessInfo("dotnet", 1, environmentVariables, "/usr/share/dotnet/dotnet", ["libcoreclr.so"]);
+
+        using var console = ConsoleHelper.Redirect();
+
+        ProcessBasicCheck.Run(process, MockRegistryService([], ProfilerPath));
+
+        console.Output.Should().Contain(TracingWithBundleProfilerPath);
+
+        console.Output.Should().NotContain(TracingWithInstallerLinux);
+    }
+
+    [SkippableFact]
+    public void DoesNotDetectBundleInAzureAppServiceRootOutsideAzureAppService()
+    {
+        SkipOn.AllExcept(SkipOn.PlatformValue.Linux);
+
+        const string profilerPath = "/home/site/wwwroot/datadog/linux-x64/Datadog.Trace.ClrProfiler.Native.so";
+        var environmentVariables = new Dictionary<string, string>
+        {
+            ["CORECLR_PROFILER"] = Utils.Profilerid,
+            ["CORECLR_ENABLE_PROFILING"] = "1",
+            ["CORECLR_PROFILER_PATH"] = profilerPath
+        };
+        var process = new ProcessInfo("dotnet", 1, environmentVariables, "/usr/share/dotnet/dotnet", ["libcoreclr.so"]);
+
+        using var console = ConsoleHelper.Redirect();
+
+        ProcessBasicCheck.Run(process, MockRegistryService([], ProfilerPath));
+
+        console.Output.Should().NotContain(TracingWithBundleProfilerPath);
+        console.Output.Should().Contain(TracingWithInstallerLinux);
+    }
+
     [SkippableFact]
     [Trait("RunOnWindows", "True")]
     public async Task DetectRuntime()