$ git clone -n https://src.fedoraproject.org/rpms/spectacle.git /var/lib/mock/f42-build-side-1-3573393-46767/root/chroot_tmpdir/scmroot/spectacle
Cloning into '/var/lib/mock/f42-build-side-1-3573393-46767/root/chroot_tmpdir/scmroot/spectacle'...
$ git fetch origin d974a574cb7d11275420d3ea33df6f36da8b3cbb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/spectacle
 * [new ref]         d974a574cb7d11275420d3ea33df6f36da8b3cbb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d974a57 6.4.0