CSHARP-5228: Allow any OS in OperatingSystemHelper (#1511)

Co-authored-by: Elias <[email protected]>

Author: BorisDog

src/MongoDB.Driver.Encryption/OperatingSystemHelper.cs

@@ -22,14 +22,15 @@ internal enum OperatingSystemPlatform
     {
         Windows,
         Linux,
-        MacOS
+        MacOS,
+        Unknown
     }
 
     internal static class OperatingSystemHelper
     {
         public static OperatingSystemPlatform CurrentOperatingSystem => __currentOperatingSystem.Value;
 
-        private static readonly Lazy<OperatingSystemPlatform> __currentOperatingSystem = new Lazy<OperatingSystemPlatform>(DetermineOperatingSystemPlatform);
+        private static readonly Lazy<OperatingSystemPlatform> __currentOperatingSystem = new(DetermineOperatingSystemPlatform);
 
         private static OperatingSystemPlatform DetermineOperatingSystemPlatform()
         {
@@ -50,7 +51,7 @@ private static OperatingSystemPlatform DetermineOperatingSystemPlatform()
             }
             else
             {
-                throw new PlatformNotSupportedException($"Unsupported platform '{RuntimeInformation.OSDescription}'.");
+                return OperatingSystemPlatform.Unknown;
             }
 #endif
         }

src/MongoDB.Driver/Core/Misc/OperatingSystemHelper.cs

@@ -22,14 +22,15 @@ internal enum OperatingSystemPlatform
     {
         Windows,
         Linux,
-        MacOS
+        MacOS,
+        Unknown
     }
 
     internal static class OperatingSystemHelper
     {
         public static OperatingSystemPlatform CurrentOperatingSystem => __currentOperatingSystem.Value;
 
-        private static readonly Lazy<OperatingSystemPlatform> __currentOperatingSystem = new Lazy<OperatingSystemPlatform>(DetermineOperatingSystemPlatform);
+        private static readonly Lazy<OperatingSystemPlatform> __currentOperatingSystem = new(DetermineOperatingSystemPlatform);
 
         private static OperatingSystemPlatform DetermineOperatingSystemPlatform()
         {
@@ -50,7 +51,7 @@ private static OperatingSystemPlatform DetermineOperatingSystemPlatform()
             }
             else
             {
-                throw new PlatformNotSupportedException($"Unsupported platform '{RuntimeInformation.OSDescription}'.");
+                return OperatingSystemPlatform.Unknown;
             }
 #endif
         }