Show a help link for accessing private GitHub org repositories

Review Request #8208 — Created June 1, 2016 and submitted — Latest diff uploaded

Information

Review Board
release-2.5.x
ec579e6...

Reviewers

When a private organization repository cannot be linked, we know show a
help link to a knowledge base article on how to add access permissions
to the repository.

To facilitate this, HostingServiceErrors now accept a help link, which
will render in the repository form with the message and a HTML link to
the URL.

  • Ran unit tests.
  • Attempted to add a private organization repository that does not exist
    and got a message with the link.