$ git clone -n https://src.fedoraproject.org/rpms/xpsk31.git /var/lib/mock/f45-build-39064-731/root/chroot_tmpdir/scmroot/xpsk31
Cloning into '/var/lib/mock/f45-build-39064-731/root/chroot_tmpdir/scmroot/xpsk31'...
$ git fetch origin ab97e36b2e6baa01847fd448725e91f15c91cb9d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xpsk31
 * [new ref]         ab97e36b2e6baa01847fd448725e91f15c91cb9d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ab97e36 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild