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SvnLoaderFromRemoteDump: Drop dump when svn repository is mounted

Antoine R. Dumont requested to merge generated-differential-D6622-source into generated-differential-D6622-target

This will decrease the disk pressure currently existing when ingesting a svn repository out of a remote dump. We first fetch a dump, then mount a svn repository out of it, and at last we ingest the repository and have a growing copy on disk [1]. So we are up to 3 copies which takes lots of disk space.

With the following commit, we take down the 1 unnecessary copy (svn dump) as soon as possible (when the svn repository is mounted which we ingest).

  • [1] implementation detail for speed, we iterate over the commit log, apply deltas (and computing swh hashes) along the way on disk.

This also:

  • improves the existing docstrings
  • add types
  • add tests on missing utils part (currently tested indirectly)

Related to #3719

Test Plan

tox (still happy)

Migrated from D6622 (view on Phabricator)

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