$ git clone -n https://src.fedoraproject.org/rpms/tetgen.git /var/lib/mock/f41-build-1041928-18994/root/chroot_tmpdir/scmroot/tetgen
Cloning into '/var/lib/mock/f41-build-1041928-18994/root/chroot_tmpdir/scmroot/tetgen'...
$ git fetch origin b426ba5af1dcb2fd84b55ff47f903265fa0e3c3a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tetgen
 * [new ref]         b426ba5af1dcb2fd84b55ff47f903265fa0e3c3a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b426ba5 Eliminate use of obsolete %patchN syntax (#2283636)