Commits on Nov 25, 2019

1. Update "Producing Consistent Snapshots" …

   Following discussions with @dstufft and @trishankatdatadog
   regarding file uploads and simple index generation on PyPI (see
   secure-systems-lab#70) this commit once more refines the
   "producing consistent snapshots" section.
   
   It includes the following changes:
   
   - Remove the notion of *transaction processes* and instead talk
     about *uploads*.
     Background: Transaction processes are only relevant if multiple
     files of a project release need to be handled in a single
     transaction, which is not the case on PyPI, where each upload of
     a distribution file is self-contained.
     With this change, upload process just place files into a queue,
     without updating bin-n metadata (as transaction processes would
     have done in parallel), and all the metadata update/creation work
     is done by the snapshot process in strictly sequential manner.
   
   - Add a paragraph about simple index pages and how their hashes
     should be included in *bin-n* metadata, and how they need to
     remain stable if re-generated dynamically.

   

   lukpueh committed Nov 25, 2019
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