[Updated] D9579: engine: refactor actual cloning code into separate function

[marmoute (Pierre-Yves David)]

This revision now requires changes to proceed.
marmoute requested changes to this revision.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D9579/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D9579

To: pulkit, #hg-reviewers, marmoute
Cc: mercurial-patches
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