From: Junio C Hamano <gitster@pobox.com>
Date: Mon, 29 Jun 2020 21:17:24 +0000 (-0700)
Subject: Merge branch 'xl/upgrade-repo-format'
X-Git-Tag: v2.28.0-rc0~34
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=1033b982914206285fb7ee772cd29f7c60c4f929;p=thirdparty%2Fgit.git

Merge branch 'xl/upgrade-repo-format'

Allow runtime upgrade of the repository format version, which needs
to be done carefully.

There is a rather unpleasant backward compatibility worry with the
last step of this series, but it is the right thing to do in the
longer term.

* xl/upgrade-repo-format:
  check_repository_format_gently(): refuse extensions for old repositories
  sparse-checkout: upgrade repository to version 1 when enabling extension
  fetch: allow adding a filter after initial clone
  repository: add a helper function to perform repository format upgrade
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1033b982914206285fb7ee772cd29f7c60c4f929