$ git clone -n https://src.fedoraproject.org/rpms/scidavis.git /var/lib/mock/f42-bootstrap-3462924-45593/root/chroot_tmpdir/scmroot/scidavis
Cloning into '/var/lib/mock/f42-bootstrap-3462924-45593/root/chroot_tmpdir/scmroot/scidavis'...
$ git fetch origin 50290fe0bac8f5cb0a2c9a55fd298b11af04e7d1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/scidavis
 * [new ref]         50290fe0bac8f5cb0a2c9a55fd298b11af04e7d1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 50290fe Rebuild with gsl 2.8