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src/Microsoft.Tye.Core/DockerContainerBuilder.cs

@@ -59,8 +59,8 @@ namespace Microsoft.Tye
                     else
                     {
                         // We need to write the file, let's stick it under obj.
-                        Directory.CreateDirectory(Path.Combine(project.ProjectFile.DirectoryName, "obj"));
+                        Directory.CreateDirectory(project.IntermediateOutputPath);
-                        dockerFilePath = Path.Combine(project.ProjectFile.DirectoryName, "obj", "Dockerfile");
+                        dockerFilePath = Path.Combine(project.IntermediateOutputPath, "Dockerfile");
 
                         // Clean up file when done building image
                         tempFile = new TempFile(dockerFilePath);
@@ -83,7 +83,7 @@ namespace Microsoft.Tye
                     // Clean up directory when done building image
                     tempDirectory = new TempDirectory(publishOutput.Directory);
 
-                    if (File.Exists(dockerFilePath) & container.UseMultiphaseDockerfile == false)
+                    if (File.Exists(dockerFilePath))
                     {
                         output.WriteDebugLine($"Using existing Dockerfile '{dockerFilePath}'.");
                         File.Copy(dockerFilePath, Path.Combine(contextDirectory, "Dockerfile"));

src/Microsoft.Tye.Core/ProjectReader.cs

@@ -201,12 +201,21 @@ namespace Microsoft.Tye
             project.TargetPath = projectInstance.GetPropertyValue("TargetPath");
             project.PublishDir = projectInstance.GetPropertyValue("PublishDir");
             project.AssemblyName = projectInstance.GetPropertyValue("AssemblyName");
+            project.IntermediateOutputPath = projectInstance.GetPropertyValue("AssemblyName");
+
+
 
             output.WriteDebugLine($"RunCommand={project.RunCommand}");
             output.WriteDebugLine($"RunArguments={project.RunArguments}");
             output.WriteDebugLine($"TargetPath={project.TargetPath}");
             output.WriteDebugLine($"PublishDir={project.PublishDir}");
             output.WriteDebugLine($"AssemblyName={project.AssemblyName}");
+            output.WriteDebugLine($"IntermediateOutputPath={project.IntermediateOutputPath}");
+
+            if (!Path.IsPathRooted(project.IntermediateOutputPath))
+            {
+                project.IntermediateOutputPath = Path.Combine(project.ProjectFile.DirectoryName, project.IntermediateOutputPath);
+            }
 
             var targetFramework = projectInstance.GetPropertyValue("TargetFramework");
             project.TargetFramework = targetFramework;

src/Microsoft.Tye.Core/ProjectServiceBuilder.cs

@@ -50,6 +50,9 @@ namespace Microsoft.Tye
         // This is always set on the ApplicationFactory codepath.
         public string PublishDir { get; set; } = default!;
 
+        // This is always set on the ApplicationFactory codepath.
+        public string IntermediateOutputPath { get; set; } = default!;
+
         // Data used for building containers
         public ContainerInfo? ContainerInfo { get; set; }