Pulp

Could we get away with having users use shell_plus for the nearterm? Otherwise we'll need to made the create, list, and delete interfaces too.

• At the end, it was decided that a detached signature will have the same name as a signed file. This consensus will be mentioned in the docs. The file type ".asc" shall be then appended to the signed filename, like so:

  "repomd.xml" -> "repomd.xml.asc"
  

• Furthermore, in the future, there might be used a different signing method for a different type of content. Due to that, the model SigningService should be a parent class of more specific models (in our case, we currently have one example of such a model - AsciiArmorDetachedSigningService). The interface for the signing method remains untouched:

  SigningService(Model):

      def sign():
          """Invoke an external signing service."""

  AsciiArmorDetachedSigningService(SigningService):

      def sign():
          """"Invoke inherited SigningService.sign() and validate returned data."""