$ git clone -n https://src.fedoraproject.org/rpms/elixir.git /var/lib/mock/f39-build-1710000-41224/root/chroot_tmpdir/scmroot/elixir
Cloning into '/var/lib/mock/f39-build-1710000-41224/root/chroot_tmpdir/scmroot/elixir'...
$ git fetch origin 7214e7f8c521c28686acf659bb19d9d41e1dcf5f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/elixir
 * [new ref]         7214e7f8c521c28686acf659bb19d9d41e1dcf5f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7214e7f Update to upstream 1.15.7