Move SystemD arg responsibility from service to Host Watchdog

build/Version.props

@@ -11,7 +11,7 @@
     <TgsClientVersion>16.0.0</TgsClientVersion>
     <TgsDmapiVersion>7.2.1</TgsDmapiVersion>
     <TgsInteropVersion>5.9.0</TgsInteropVersion>
-    <TgsHostWatchdogVersion>1.4.1</TgsHostWatchdogVersion>
+    <TgsHostWatchdogVersion>1.5.0</TgsHostWatchdogVersion>
     <TgsContainerScriptVersion>1.2.1</TgsContainerScriptVersion>
     <TgsMigratorVersion>2.0.0</TgsMigratorVersion>
     <TgsNugetNetFramework>netstandard2.0</TgsNugetNetFramework>

build/tgstation-server.service

@@ -11,7 +11,7 @@ User=tgstation-server
 Type=notify-reload
 NotifyAccess=all
 WorkingDirectory=/opt/tgstation-server
-ExecStart=/usr/bin/dotnet Tgstation.Server.Host.Console.dll --appsettings-base-path=/etc/tgstation-server --General:SetupWizardMode=Never --Internal:UsingSystemD=true
+ExecStart=/usr/bin/dotnet Tgstation.Server.Host.Console.dll --appsettings-base-path=/etc/tgstation-server --General:SetupWizardMode=Never
 TimeoutStartSec=600
 Restart=always
 KillMode=process

src/Tgstation.Server.Host.Console/Program.cs

@@ -1,10 +1,12 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Reflection;
 using System.Runtime.InteropServices;
 using System.Threading;
 using System.Threading.Tasks;
 
+using Microsoft.Extensions.Hosting.Systemd;
 using Microsoft.Extensions.Logging;
 
 using Tgstation.Server.Common;
@@ -44,6 +46,11 @@ namespace Tgstation.Server.Host.Console
 			var trace = arguments.Remove("--trace-host-watchdog");
 			var debug = arguments.Remove("--debug-host-watchdog");
 
+			const string SystemDArg = "--Internal:UsingSystemD=true";
+			if (!arguments.Any(arg => arg.Equals(SystemDArg, StringComparison.OrdinalIgnoreCase))
+				&& SystemdHelpers.IsSystemdService())
+				arguments.Add(SystemDArg);
+
 			using var loggerFactory = LoggerFactory.Create(builder =>
 			{
 				if (trace)

src/Tgstation.Server.Host.Console/Tgstation.Server.Host.Console.csproj

@@ -11,6 +11,8 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <!-- Usage: Identifying if we're running under SystemD -->
+    <PackageReference Include="Microsoft.Extensions.Hosting.Systemd" Version="8.0.0" />
     <!-- Usage: Console logging plugin -->
     <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="8.0.0" />
   </ItemGroup>