$ git clone -n https://src.fedoraproject.org/rpms/git-xcleaner.git /var/lib/mock/f45-build-11093-427/root/chroot_tmpdir/scmroot/git-xcleaner
Cloning into '/var/lib/mock/f45-build-11093-427/root/chroot_tmpdir/scmroot/git-xcleaner'...
$ git fetch origin 13d6493e1d9a343ac301c0a5e0a79a3a0a1eb401:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/git-xcleaner
 * [new ref]         13d6493e1d9a343ac301c0a5e0a79a3a0a1eb401 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 13d6493 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild