Fix breadcrumbs in process-isolated hosts

FileInspectorX.Tests/SettingsBehaviorTests.cs

@@ -1,13 +1,44 @@
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.Threading;
-using FileInspectorX;
+using System.Collections.Generic;
+using System.Diagnostics;
+#if NET8_0_OR_GREATER
+using System.Reflection;
+using System.Runtime.Loader;
+#endif
+using System.Threading;
+using FileInspectorX;
 
 namespace FileInspectorX.Tests;
 
 [Xunit.Collection(nameof(DetectionSettingsCollection))]
 public class SettingsBehaviorTests
-{
+{
+#if NET8_0_OR_GREATER
+    [Xunit.Fact]
+    public void Breadcrumbs_DoNotRequireProcessAssembly()
+    {
+        var logPath = Path.Combine(Path.GetTempPath(), $"FileInspectorX.Breadcrumbs.{Guid.NewGuid():N}.log");
+        var loadContext = new ProcessRejectingLoadContext();
+        try
+        {
+            var assembly = loadContext.LoadFromAssemblyPath(typeof(FileInspector).Assembly.Location);
+            var settings = assembly.GetType("FileInspectorX.Settings", throwOnError: true)!;
+            settings.GetProperty("BreadcrumbsEnabled")!.SetValue(null, true);
+            settings.GetProperty("BreadcrumbsPath")!.SetValue(null, logPath);
+            var breadcrumbs = assembly.GetType("FileInspectorX.Breadcrumbs", throwOnError: true)!;
+            var write = breadcrumbs.GetMethod("Write", BindingFlags.Static | BindingFlags.NonPublic)!;
+
+            write.Invoke(null, new object?[] { "ISOLATED_TEST", null, null });
+
+            Xunit.Assert.Contains($"PID={Environment.ProcessId}", File.ReadAllText(logPath), StringComparison.Ordinal);
+        }
+        finally
+        {
+            loadContext.Unload();
+            File.Delete(logPath);
+        }
+    }
+#endif
+
     [Xunit.Fact]
     public void JsonValidationCore_TimesOut_When_StopwatchExpired()
     {
@@ -93,5 +124,18 @@ public void DangerousExtensionsOverrideMode_Merge_Keeps_Defaults()
             Settings.DangerousExtensionsOverride = prevOverride;
             Settings.DangerousExtensionsOverrideMode = prevMode;
         }
-    }
-}
+    }
+
+#if NET8_0_OR_GREATER
+    private sealed class ProcessRejectingLoadContext() : AssemblyLoadContext(isCollectible: true)
+    {
+        protected override Assembly? Load(AssemblyName assemblyName)
+        {
+            if (string.Equals(assemblyName.Name, "System.Diagnostics.Process", StringComparison.Ordinal))
+                throw new FileNotFoundException("Process assembly is unavailable in the isolated test context.", assemblyName.Name);
+
+            return null;
+        }
+    }
+#endif
+}

FileInspectorX/FileInspectorX.csproj

@@ -8,7 +8,7 @@
         <GenerateDocumentationFile>true</GenerateDocumentationFile>
         <Description>FileInspectorX: dependency-free content type detection (magic bytes + heuristics)</Description>
         <AssemblyName>FileInspectorX</AssemblyName>
-        <VersionPrefix>1.1.1</VersionPrefix>
+        <VersionPrefix>1.1.2</VersionPrefix>
         <DisableImplicitNuGetFallbackFolder>true</DisableImplicitNuGetFallbackFolder>
         <PackageReadmeFile>README.MD</PackageReadmeFile>
         <PackageProjectUrl>https://github.com/EvotecIT/FileInspectorX</PackageProjectUrl>

FileInspectorX/Logging/Breadcrumbs.cs

@@ -43,12 +43,15 @@ internal static void Write(string tag, string? message = null, string? path = nu
                 }
             } catch { }
             var now = DateTime.UtcNow.ToString("yyyy-MM-dd HH:mm:ss.fffZ");
+#if NET8_0_OR_GREATER
+            var pid = Environment.ProcessId;
+#else
             var pid = Process.GetCurrentProcess().Id;
+#endif
             var tid = Environment.CurrentManagedThreadId;
             var line = $"{now} PID={pid} TID={tid} TAG={tag}{(path!=null?" PATH="+path:"")}{(message!=null?" MSG="+message:"")}";
             File.AppendAllText(file, line + Environment.NewLine);
         }
         catch { /* never throw from breadcrumbs */ }
     }
 }
-