$ git clone -n https://src.fedoraproject.org/rpms/R-gapminder.git /var/lib/mock/f45-build-6134-346/root/chroot_tmpdir/scmroot/R-gapminder
Cloning into '/var/lib/mock/f45-build-6134-346/root/chroot_tmpdir/scmroot/R-gapminder'...
$ git fetch origin cfa729d00b10fad28a3a3ba1041f5e1fbff15f16:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-gapminder
 * [new ref]         cfa729d00b10fad28a3a3ba1041f5e1fbff15f16 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cfa729d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild