$ git clone -n https://src.fedoraproject.org/rpms/gd.git /var/lib/mock/f45-build-9663-407/root/chroot_tmpdir/scmroot/gd
Cloning into '/var/lib/mock/f45-build-9663-407/root/chroot_tmpdir/scmroot/gd'...
$ git fetch origin 355c1f4505dfc34c372ce79ab12a4dc099bf0e85:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gd
 * [new ref]         355c1f4505dfc34c372ce79ab12a4dc099bf0e85 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 355c1f4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild