$ git clone -n https://src.fedoraproject.org/rpms/mysql8.0.git /var/lib/mock/f41-build-859666-168699/root/chroot_tmpdir/scmroot/mysql8.0
Cloning into '/var/lib/mock/f41-build-859666-168699/root/chroot_tmpdir/scmroot/mysql8.0'...
$ git fetch origin c6e2436d8eaa949929d220b78f5b11ba1dd680aa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mysql8.0
 * [new ref]         c6e2436d8eaa949929d220b78f5b11ba1dd680aa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c6e2436 Rebase to 8.0.39