$ git clone -n https://src.fedoraproject.org/rpms/python-onigurumacffi.git /var/lib/mock/f39-build-1431740-31800/root/chroot_tmpdir/scmroot/python-onigurumacffi
Cloning into '/var/lib/mock/f39-build-1431740-31800/root/chroot_tmpdir/scmroot/python-onigurumacffi'...
$ git fetch origin 336280a61bc77ad0561a1e581e872ac9a42adc0d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-onigurumacffi
 * [new ref]         336280a61bc77ad0561a1e581e872ac9a42adc0d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 336280a Upload sources