git-clone --config remote.origin.fetch regression

From: Han-Wen Nienhuys <hanwen@google.com>
Date: May 28, 2019, 22:34 UTC
Message-ID: <CAFQ2z_O7rupGS4rntiUwJCHUj3bO0U88bVAToveEo_uU0Eu96w@mail.gmail.com>

(see also https://github.com/google/zoekt/issues/81)

It looks like git 2.21 included a regression. The command

git clone --bare --progress \
  --config "remote.origin.fetch=+refs/heads/*:refs/heads/*" \
  https://github.com/google/zoekt.git \
  /tmp/zoekt-git2.20.git

would succeed with git 2.20, but fails with

 fatal: multiple updates for ref 'refs/heads/master' not allowed

in git 2.21, probably caused by commit 515be83.

Should I call git in another way? I originally included "remote.origin.fetch=+refs/heads/*:refs/heads/*" to avoid getting Gerrit refs (refs/changes/*), but maybe I should use a different incantation?

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