$ git clone -n https://src.fedoraproject.org/rpms/python-betamax.git /var/lib/mock/f45-build-29776-641/root/chroot_tmpdir/scmroot/python-betamax
Cloning into '/var/lib/mock/f45-build-29776-641/root/chroot_tmpdir/scmroot/python-betamax'...
$ git fetch origin 47533d500e8c9e9ca7e4d92360baf60fba0770dd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-betamax
 * [new ref]         47533d500e8c9e9ca7e4d92360baf60fba0770dd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 47533d5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild