x/pkgsite: support removing packages in the top-level module, but not in nested modules

[bogdandrutu]

What is the URL of the page with the issue?

https://pkg.go.dev/mod/go.opentelemetry.io?tab=packages

What did you do?

Initially using https://github.com/GoogleCloudPlatform/govanityurls.git we publish modules directly under go.opentelemetry.io but later because we found that we will have more repos we decided to use different paths to export different repositories

/otel:
  repo: https://github.com/open-telemetry/opentelemetry-go
/collector:
  repo: https://github.com/open-telemetry/opentelemetry-collector
/contrib/otel:
  repo: https://github.com/open-telemetry/opentelemetry-go-contrib
/contrib/collector:
  repo: https://github.com/open-telemetry/opentelemetry-collector-contrib

Before we had (which we replaced 6 moths ago, and never used):

/:
  repo: https://github.com/open-telemetry/opentelemetry-go

What did you expect to see?

I would expect all the old packages that we exported previously https://pkg.go.dev/mod/go.opentelemetry.io?tab=packages to be gone.

What did you see instead?

I would expect to have only packages under https://pkg.go.dev/mod/go.opentelemetry.io/otel?tab=packages

[ALTree]

cc @julieqiu

[julieqiu]

At the moment, we exclude packages based on having a shared path prefix, so removing go.opentelemetry.io would remove all packages with that prefix, including the ones in go.opentelemetry.io/otel.

We can work on a fix for this so that it is on a module level.

[bogdandrutu]

Thank you @julieqiu

[bogdandrutu]

@julieqiu any update on this? Thank you so much for your help