$ git clone -n https://src.fedoraproject.org/rpms/apache-commons-math.git /var/lib/mock/f40-build-2441394-60994/root/chroot_tmpdir/scmroot/apache-commons-math
Cloning into '/var/lib/mock/f40-build-2441394-60994/root/chroot_tmpdir/scmroot/apache-commons-math'...
$ git fetch origin 0ea45e5f528a0c1ffa05d9791e1059815499ac7e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/apache-commons-math
 * [new ref]         0ea45e5f528a0c1ffa05d9791e1059815499ac7e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0ea45e5 Fix commons.packageId