Various things:

Remove leading whitespace in Process output
IDreamMaker.Compile now only returns successful CompileJobs
Added a todo about JobExceptions

src/Tgstation.Server.Host/Components/Compiler/DreamMaker.cs

@@ -176,7 +176,7 @@ namespace Tgstation.Server.Host.Components.Compiler
 
 				logger.LogDebug("DreamMaker exit code: {0}", exitCode);
 				job.Output = dm.GetCombinedOutput();
-				logger.LogTrace("DreamMaker output: {0}", job.Output);
+				logger.LogTrace("DreamMaker output: {0}{1}", Environment.NewLine, job.Output);
 				return exitCode;
 			}
 		}
@@ -263,11 +263,7 @@ namespace Tgstation.Server.Host.Components.Compiler
 			lock (this)
 			{
 				if (Status != CompilerStatus.Idle)
-				{
-					job.Output = "There is already a compile in progress!";
-					logger.LogInformation(job.Output);
-					return job;
-				}
+					throw new Exception("There is already a compile in progress!");
 
 				Status = CompilerStatus.Copying;
 			}
@@ -340,11 +336,7 @@ namespace Tgstation.Server.Host.Components.Compiler
 							logger.LogTrace("Searching for available .dmes...");
 							var path = (await ioManager.GetFilesWithExtension(dirA, DmeExtension, cancellationToken).ConfigureAwait(false)).FirstOrDefault();
 							if (path == default)
-							{
-								job.Output = "Unable to find any .dme!";
-								logger.LogWarning(job.Output);
-								return job;
-							}
+								throw new Exception("Unable to find any .dme!");
 							var dmeWithExtension = ioManager.GetFileName(path);
 							job.DmeName = dmeWithExtension.Substring(0, dmeWithExtension.Length - DmeExtension.Length - 1);
 						}

src/Tgstation.Server.Host/Core/Process.cs

@@ -50,7 +50,7 @@ namespace Tgstation.Server.Host.Core
 		{
 			if (combinedStringBuilder == null)
 				throw new InvalidOperationException("Output/Error reading was not enabled!");
-			return combinedStringBuilder.ToString();
+			return combinedStringBuilder.ToString().TrimStart(Environment.NewLine.ToCharArray());
 		}
 
 		/// <inheritdoc />
@@ -58,7 +58,7 @@ namespace Tgstation.Server.Host.Core
 		{
 			if (errorStringBuilder == null)
 				throw new InvalidOperationException("Error reading was not enabled!");
-			return errorStringBuilder.ToString();
+			return errorStringBuilder.ToString().TrimStart(Environment.NewLine.ToCharArray());
 		}
 
 		/// <inheritdoc />
@@ -66,7 +66,7 @@ namespace Tgstation.Server.Host.Core
 		{
 			if (outputStringBuilder == null)
 				throw new InvalidOperationException("Output reading was not enabled!");
-			return errorStringBuilder.ToString();
+			return errorStringBuilder.ToString().TrimStart(Environment.NewLine.ToCharArray());
 		}
 
 		/// <inheritdoc />

v4_prototype_TODO.txt

@@ -1,3 +1,5 @@
 Verify the byond cache folder location on linux
 
 Test watchdog
+
+Add a JobException type that the job manager will just print the message of. Replace throw new Exception()s with it