Prework

• Read and agree to the code of conduct and contributing guidelines.
• If there is already a relevant issue, whether open or closed, comment on the existing thread instead of posting a new issue.
• For any problems you identify, post a minimal reproducible example like this one so the maintainer can troubleshoot. Convenient helpers for this include targets::tar_reprex() and reprex::reprex(). A reproducible example is:
  • Runnable: post enough R code and data so any onlooker can create the error on their own computer.
  • Minimal: reduce runtime wherever possible and remove complicated details that are irrelevant to the issue at hand.
  • Readable: format your code according to the tidyverse style guide.

Description

• Deprecate the special "aws_*" storage formats in favor of a new repository argument of tar_target() which could be "none", "aws", or "gcp".
• Adjust tar_format() accordingly.
• Resolve the class structure of store objects dynamically instead of implementing all the combinations in advance (e.g. class_aws_qs).

This will help scale targets to more cloud storage platforms.