$ git clone -n https://src.fedoraproject.org/rpms/rpmconf.git /var/lib/mock/f45-build-34661-690/root/chroot_tmpdir/scmroot/rpmconf
Cloning into '/var/lib/mock/f45-build-34661-690/root/chroot_tmpdir/scmroot/rpmconf'...
$ git fetch origin 84969e0db7ac8c7f8e28ee0373f69c48ef5028df:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rpmconf
 * [new ref]         84969e0db7ac8c7f8e28ee0373f69c48ef5028df -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 84969e0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild