$ git clone -n https://src.fedoraproject.org/rpms/python-aiohttp.git /var/lib/mock/f39-build-1453520-32885/root/chroot_tmpdir/scmroot/python-aiohttp
Cloning into '/var/lib/mock/f39-build-1453520-32885/root/chroot_tmpdir/scmroot/python-aiohttp'...
$ git fetch origin 47356f10f4b1c67c759cf57c60058768a889b51e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-aiohttp
 * [new ref]         47356f10f4b1c67c759cf57c60058768a889b51e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 47356f1 Update to 3.8.5 (close RHBZ#2227458)