$ git clone -n https://src.fedoraproject.org/rpms/python-paste.git /var/lib/mock/f45-build-31939-656/root/chroot_tmpdir/scmroot/python-paste
Cloning into '/var/lib/mock/f45-build-31939-656/root/chroot_tmpdir/scmroot/python-paste'...
$ git fetch origin f6546c1b9e11e8673fbfd8d7e6e71bf8950bdc43:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-paste
 * [new ref]         f6546c1b9e11e8673fbfd8d7e6e71bf8950bdc43 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f6546c1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild