$ git clone -n https://src.fedoraproject.org/rpms/groff.git /var/lib/mock/f45-build-13034-446/root/chroot_tmpdir/scmroot/groff
Cloning into '/var/lib/mock/f45-build-13034-446/root/chroot_tmpdir/scmroot/groff'...
$ git fetch origin 3ba091a4246c43d39c5d600dd1d342fb2e277088:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/groff
 * [new ref]         3ba091a4246c43d39c5d600dd1d342fb2e277088 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3ba091a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild