$ git clone -n https://src.fedoraproject.org/rpms/python-astropy-helpers.git /var/lib/mock/f40-build-2365663-60375/root/chroot_tmpdir/scmroot/python-astropy-helpers
Cloning into '/var/lib/mock/f40-build-2365663-60375/root/chroot_tmpdir/scmroot/python-astropy-helpers'...
$ git fetch origin 9354dc7c90c469159a094c8213ab7b8f7ed949ab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-astropy-helpers
 * [new ref]         9354dc7c90c469159a094c8213ab7b8f7ed949ab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9354dc7 package retired upstream