$ git clone -n https://src.fedoraproject.org/rpms/R-showtext.git /var/lib/mock/f45-build-6425-348/root/chroot_tmpdir/scmroot/R-showtext
Cloning into '/var/lib/mock/f45-build-6425-348/root/chroot_tmpdir/scmroot/R-showtext'...
$ git fetch origin 3676861c58c1063b9f31dff7609c188cfd9bbd74:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-showtext
 * [new ref]         3676861c58c1063b9f31dff7609c188cfd9bbd74 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3676861 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild