How to make a transitive task?

[timcassell]

I created a task to run an assembly weave with Mono.Cecil in an after build target. I want this task to run on all projects that reference my project via <ProjectReference>.

From working with CoPilot, it explained that ProjectReferences cannot have transitive tasks, only PackageReferences can via .targets file. So I thought, ok, I can just use a BeforeTargets="Restore" task exec command powershell script to clear the nuget cache and build the package, and add a PackageReference to the newly built package with a local <RestoreSources>, and that will be transitive. This seems to work fine when I build my project (using dotnet build), however, when I build another project that has a ProjectReference to my project, the target doesn't run, so my script doesn't execute, and the build fails if the package didn't exist already (or doesn't have up-to-date code if it did exist).

When I ask CoPilot how to solve it, it just goes around in circles. Am I missing something, or is it just not possible? It feels so close...