$ git clone -n https://src.fedoraproject.org/rpms/vim.git /var/lib/mock/f41-build-860762-169191/root/chroot_tmpdir/scmroot/vim
Cloning into '/var/lib/mock/f41-build-860762-169191/root/chroot_tmpdir/scmroot/vim'...
$ git fetch origin 890a4758cd1261d31088d276ea023d44e0d977b6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vim
 * [new ref]           890a4758cd1261d31088d276ea023d44e0d977b6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 890a4758 - patchlevel 825