$ git clone -n https://src.fedoraproject.org/rpms/python-greenlet.git /var/lib/mock/f39-build-1920829-42954/root/chroot_tmpdir/scmroot/python-greenlet
Cloning into '/var/lib/mock/f39-build-1920829-42954/root/chroot_tmpdir/scmroot/python-greenlet'...
$ git fetch origin d91e611d3283d6a9afa54766829747e897c62788:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-greenlet
 * [new ref]         d91e611d3283d6a9afa54766829747e897c62788 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d91e611 3.0.1