D4797: storageutil: implement file identifier resolution method (BC)

[indygreg (Gregory Szorc)]

indygreg added a subscriber: martinvonz.
indygreg added a comment.


  @martinvonz: you may have an interest in this and https://phab.mercurial-scm.org/D4798, specifically the existing wonky behavior of `revlog.lookup()`, which these changes effectively skate around.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D4797

To: indygreg, #hg-reviewers
Cc: martinvonz, mercurial-devel