$ git clone -n https://src.fedoraproject.org/rpms/gnome-tour.git /var/lib/mock/f42-build-side-1-3506404-45996/root/chroot_tmpdir/scmroot/gnome-tour
Cloning into '/var/lib/mock/f42-build-side-1-3506404-45996/root/chroot_tmpdir/scmroot/gnome-tour'...
$ git fetch origin bf863ce2de34c04cb729b52387ff2182aec5fe8e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-tour
 * [new ref]         bf863ce2de34c04cb729b52387ff2182aec5fe8e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf863ce Update to 48.1