$ git clone -n https://src.fedoraproject.org/rpms/quodlibet.git /var/lib/mock/f39-build-1621527-38724/root/chroot_tmpdir/scmroot/quodlibet
Cloning into '/var/lib/mock/f39-build-1621527-38724/root/chroot_tmpdir/scmroot/quodlibet'...
$ git fetch origin c34f67ec72a49fefb1e183663cf7cb96908a037d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/quodlibet
 * [new ref]         c34f67ec72a49fefb1e183663cf7cb96908a037d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c34f67e Run tests