diff --git a/src/Tgstation.Server.Host/Components/StaticFiles/Configuration.cs b/src/Tgstation.Server.Host/Components/StaticFiles/Configuration.cs
index 3644f20991..b2e12d1947 100644
--- a/src/Tgstation.Server.Host/Components/StaticFiles/Configuration.cs
+++ b/src/Tgstation.Server.Host/Components/StaticFiles/Configuration.cs
@@ -23,8 +23,6 @@ using Tgstation.Server.Host.System;
 using Tgstation.Server.Host.Transfer;
 using Tgstation.Server.Host.Utils;
 
-#nullable disable
-
 namespace Tgstation.Server.Host.Components.StaticFiles
 {
 	/// <inheritdoc />
@@ -80,7 +78,7 @@ namespace Tgstation.Server.Host.Components.StaticFiles
 					eventType => new KeyValuePair<EventType, IReadOnlyList<string>>(
 						eventType,
 						typeof(EventType)
-							.GetField(eventType.ToString())
+							.GetField(eventType.ToString())!
 							.GetCustomAttributes(false)
 							.OfType<EventScriptAttribute>()
 							.First()
@@ -201,7 +199,7 @@ namespace Tgstation.Server.Host.Components.StaticFiles
 		}
 
 		/// <inheritdoc />
-		public async ValueTask<ServerSideModifications> CopyDMFilesTo(string dmeFile, string destination, CancellationToken cancellationToken)
+		public async ValueTask<ServerSideModifications?> CopyDMFilesTo(string dmeFile, string destination, CancellationToken cancellationToken)
 		{
 			using (await SemaphoreSlimContext.Lock(semaphore, cancellationToken))
 			{
@@ -234,12 +232,19 @@ namespace Tgstation.Server.Host.Components.StaticFiles
 
 				static string IncludeLine(string filePath) => String.Format(CultureInfo.InvariantCulture, "#include \"{0}\"", filePath);
 
-				return new ServerSideModifications(headFileExistsTask.Result ? IncludeLine(CodeModificationsHeadFile) : null, tailFileExistsTask.Result ? IncludeLine(CodeModificationsTailFile) : null, false);
+				return new ServerSideModifications(
+					headFileExistsTask.Result
+						? IncludeLine(CodeModificationsHeadFile)
+						: null,
+					tailFileExistsTask.Result
+						? IncludeLine(CodeModificationsTailFile)
+						: null,
+					false);
 			}
 		}
 
 		/// <inheritdoc />
-		public async ValueTask<IOrderedQueryable<ConfigurationFileResponse>> ListDirectory(string configurationRelativePath, ISystemIdentity systemIdentity, CancellationToken cancellationToken)
+		public async ValueTask<IOrderedQueryable<ConfigurationFileResponse>?> ListDirectory(string? configurationRelativePath, ISystemIdentity? systemIdentity, CancellationToken cancellationToken)
 		{
 			await EnsureDirectories(cancellationToken);
 			var path = ValidateConfigRelativePath(configurationRelativePath);
@@ -286,12 +291,12 @@ namespace Tgstation.Server.Host.Components.StaticFiles
 		}
 
 		/// <inheritdoc />
-		public async ValueTask<ConfigurationFileResponse> Read(string configurationRelativePath, ISystemIdentity systemIdentity, CancellationToken cancellationToken)
+		public async ValueTask<ConfigurationFileResponse?> Read(string configurationRelativePath, ISystemIdentity? systemIdentity, CancellationToken cancellationToken)
 		{
 			await EnsureDirectories(cancellationToken);
 			var path = ValidateConfigRelativePath(configurationRelativePath);
 
-			ConfigurationFileResponse result = null;
+			ConfigurationFileResponse? result = null;
 
 			void ReadImpl()
 			{
@@ -321,7 +326,7 @@ namespace Tgstation.Server.Host.Components.StaticFiles
 							},
 							async cancellationToken =>
 							{
-								FileStream result = null;
+								FileStream? result = null;
 								void GetFileStream()
 								{
 									result = ioManager.GetFileStream(path, false);
@@ -332,7 +337,7 @@ namespace Tgstation.Server.Host.Components.StaticFiles
 								else
 									await systemIdentity.RunImpersonated(GetFileStream, cancellationToken);
 
-								return result;
+								return result!;
 							},
 							path,
 							false));
@@ -453,12 +458,12 @@ namespace Tgstation.Server.Host.Components.StaticFiles
 		}
 
 		/// <inheritdoc />
-		public async ValueTask<ConfigurationFileResponse> Write(string configurationRelativePath, ISystemIdentity systemIdentity, string previousHash, CancellationToken cancellationToken)
+		public async ValueTask<ConfigurationFileResponse?> Write(string configurationRelativePath, ISystemIdentity? systemIdentity, string? previousHash, CancellationToken cancellationToken)
 		{
 			await EnsureDirectories(cancellationToken);
 			var path = ValidateConfigRelativePath(configurationRelativePath);
 
-			ConfigurationFileResponse result = null;
+			ConfigurationFileResponse? result = null;
 
 			void WriteImpl()
 			{
@@ -563,7 +568,7 @@ namespace Tgstation.Server.Host.Components.StaticFiles
 		}
 
 		/// <inheritdoc />
-		public async ValueTask<bool?> CreateDirectory(string configurationRelativePath, ISystemIdentity systemIdentity, CancellationToken cancellationToken)
+		public async ValueTask<bool?> CreateDirectory(string configurationRelativePath, ISystemIdentity? systemIdentity, CancellationToken cancellationToken)
 		{
 			await EnsureDirectories(cancellationToken);
 			var path = ValidateConfigRelativePath(configurationRelativePath);
@@ -585,7 +590,7 @@ namespace Tgstation.Server.Host.Components.StaticFiles
 					await systemIdentity.RunImpersonated(DoCreate, cancellationToken);
 			}
 
-			return result.Value;
+			return result!.Value;
 		}
 
 		/// <inheritdoc />
@@ -659,7 +664,7 @@ namespace Tgstation.Server.Host.Components.StaticFiles
 		}
 
 		/// <inheritdoc />
-		public async ValueTask<bool?> DeleteDirectory(string configurationRelativePath, ISystemIdentity systemIdentity, CancellationToken cancellationToken)
+		public async ValueTask<bool?> DeleteDirectory(string configurationRelativePath, ISystemIdentity? systemIdentity, CancellationToken cancellationToken)
 		{
 			await EnsureDirectories(cancellationToken);
 			var path = ValidateConfigRelativePath(configurationRelativePath);
@@ -737,16 +742,16 @@ namespace Tgstation.Server.Host.Components.StaticFiles
 		/// </summary>
 		/// <param name="configurationRelativePath">A relative path in the instance's configuration directory.</param>
 		/// <returns>The full on-disk path of <paramref name="configurationRelativePath"/>.</returns>
-		string ValidateConfigRelativePath(string configurationRelativePath)
+		string ValidateConfigRelativePath(string? configurationRelativePath)
 		{
 			var nullOrEmptyCheck = String.IsNullOrEmpty(configurationRelativePath);
 			if (nullOrEmptyCheck)
 				configurationRelativePath = DefaultIOManager.CurrentDirectory;
-			if (configurationRelativePath[0] == Path.DirectorySeparatorChar || configurationRelativePath[0] == Path.AltDirectorySeparatorChar)
+			if (configurationRelativePath![0] == Path.DirectorySeparatorChar || configurationRelativePath[0] == Path.AltDirectorySeparatorChar)
 				configurationRelativePath = DefaultIOManager.CurrentDirectory + configurationRelativePath;
 			var resolved = ioManager.ResolvePath(configurationRelativePath);
 			var local = !nullOrEmptyCheck ? ioManager.ResolvePath() : null;
-			if (!nullOrEmptyCheck && resolved.Length < local.Length) // .. fuccbois
+			if (!nullOrEmptyCheck && resolved.Length < local!.Length) // .. fuccbois
 				throw new InvalidOperationException("Attempted to access file outside of configuration manager!");
 			return resolved;
 		}
diff --git a/src/Tgstation.Server.Host/Components/StaticFiles/IConfiguration.cs b/src/Tgstation.Server.Host/Components/StaticFiles/IConfiguration.cs
index db32cc1c2b..d156df54cb 100644
--- a/src/Tgstation.Server.Host/Components/StaticFiles/IConfiguration.cs
+++ b/src/Tgstation.Server.Host/Components/StaticFiles/IConfiguration.cs
@@ -39,7 +39,7 @@ namespace Tgstation.Server.Host.Components.StaticFiles
 		/// <param name="systemIdentity">The <see cref="ISystemIdentity"/> for the operation. If <see langword="null"/>, the operation will be performed as the user of the <see cref="Core.Application"/>.</param>
 		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation.</param>
 		/// <returns>A <see cref="ValueTask{TResult}"/> resulting in an <see cref="IOrderedQueryable{T}"/> of the <see cref="ConfigurationFileResponse"/>s for the items in the directory. <see cref="FileTicketResponse.FileTicket"/> and <see cref="IConfigurationFile.LastReadHash"/> will both be <see langword="null"/>. <see langword="null"/> will be returned if the operation failed due to access contention.</returns>
-		ValueTask<IOrderedQueryable<ConfigurationFileResponse>> ListDirectory(string? configurationRelativePath, ISystemIdentity? systemIdentity, CancellationToken cancellationToken);
+		ValueTask<IOrderedQueryable<ConfigurationFileResponse>?> ListDirectory(string? configurationRelativePath, ISystemIdentity? systemIdentity, CancellationToken cancellationToken);
 
 		/// <summary>
 		/// Reads a given <paramref name="configurationRelativePath"/>.
diff --git a/src/Tgstation.Server.Host/Components/StaticFiles/ServerSideModifications.cs b/src/Tgstation.Server.Host/Components/StaticFiles/ServerSideModifications.cs
index 6b7e358f0b..e28920a06e 100644
--- a/src/Tgstation.Server.Host/Components/StaticFiles/ServerSideModifications.cs
+++ b/src/Tgstation.Server.Host/Components/StaticFiles/ServerSideModifications.cs
@@ -13,12 +13,12 @@
 		/// <summary>
 		/// The #include line which should be added to the beginning of the .dme if any.
 		/// </summary>
-		public string HeadIncludeLine { get; }
+		public string? HeadIncludeLine { get; }
 
 		/// <summary>
 		/// The #include line which should be added to the end of the .dme if any.
 		/// </summary>
-		public string TailIncludeLine { get; }
+		public string? TailIncludeLine { get; }
 
 		/// <summary>
 		/// Initializes a new instance of the <see cref="ServerSideModifications"/> class.
@@ -26,7 +26,7 @@
 		/// <param name="headIncludeLine">The value of <see cref="HeadIncludeLine"/>.</param>
 		/// <param name="tailIncludeLine">The value of <see cref="TailIncludeLine"/>.</param>
 		/// <param name="totalDmeOverwrite">The value of <see cref="TotalDmeOverwrite"/>.</param>
-		public ServerSideModifications(string headIncludeLine, string tailIncludeLine, bool totalDmeOverwrite)
+		public ServerSideModifications(string? headIncludeLine, string? tailIncludeLine, bool totalDmeOverwrite)
 		{
 			HeadIncludeLine = headIncludeLine;
 			TailIncludeLine = tailIncludeLine;
diff --git a/src/Tgstation.Server.Host/IO/DefaultIOManager.cs b/src/Tgstation.Server.Host/IO/DefaultIOManager.cs
index 89231a6a49..1126bafc7d 100644
--- a/src/Tgstation.Server.Host/IO/DefaultIOManager.cs
+++ b/src/Tgstation.Server.Host/IO/DefaultIOManager.cs
@@ -69,7 +69,7 @@ namespace Tgstation.Server.Host.IO
 
 		/// <inheritdoc />
 		public async ValueTask CopyDirectory(
-			IEnumerable<string> ignore,
+			IEnumerable<string>? ignore,
 			Func<string, string, ValueTask>? postCopyCallback,
 			string src,
 			string dest,
diff --git a/src/Tgstation.Server.Host/IO/IIOManager.cs b/src/Tgstation.Server.Host/IO/IIOManager.cs
index ed4a90fb52..d88ec3ec17 100644
--- a/src/Tgstation.Server.Host/IO/IIOManager.cs
+++ b/src/Tgstation.Server.Host/IO/IIOManager.cs
@@ -56,7 +56,7 @@ namespace Tgstation.Server.Host.IO
 		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation.</param>
 		/// <returns>A <see cref="ValueTask"/> representing the running operation.</returns>
 		ValueTask CopyDirectory(
-			IEnumerable<string> ignore,
+			IEnumerable<string>? ignore,
 			Func<string, string, ValueTask>? postCopyCallback,
 			string src,
 			string dest,