$ git clone -n https://src.fedoraproject.org/rpms/python-postorius.git /var/lib/mock/f41-build-side-2-python-2715707-30545/root/chroot_tmpdir/scmroot/python-postorius
Cloning into '/var/lib/mock/f41-build-side-2-python-2715707-30545/root/chroot_tmpdir/scmroot/python-postorius'...
$ git fetch origin 4fa6438ff1befb957a2a189a5027859c6f2b38d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-postorius
 * [new ref]         4fa6438ff1befb957a2a189a5027859c6f2b38d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4fa6438 Depend on readme-renderer[md] as is, to pick up cmarkgfm