$ git clone -n https://src.fedoraproject.org/rpms/stellarium.git /var/lib/mock/f42-build-3364239-45044/root/chroot_tmpdir/scmroot/stellarium
Cloning into '/var/lib/mock/f42-build-3364239-45044/root/chroot_tmpdir/scmroot/stellarium'...
$ git fetch origin 1e9a975e721eb5f634bd9298724048c053223006:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/stellarium
 * [new ref]         1e9a975e721eb5f634bd9298724048c053223006 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1e9a975 Rebuild (NLopt)