$ git clone -n https://src.fedoraproject.org/rpms/gts.git /var/lib/mock/f45-build-13219-447/root/chroot_tmpdir/scmroot/gts
Cloning into '/var/lib/mock/f45-build-13219-447/root/chroot_tmpdir/scmroot/gts'...
$ git fetch origin eaa4f83580f3e71b63e54d8f9ddc87cd89a0bbda:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gts
 * [new ref]         eaa4f83580f3e71b63e54d8f9ddc87cd89a0bbda -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eaa4f83 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild