$ git clone -n https://src.fedoraproject.org/rpms/openblas.git /var/lib/mock/f40-build-1965537-25205/root/chroot_tmpdir/scmroot/openblas
Cloning into '/var/lib/mock/f40-build-1965537-25205/root/chroot_tmpdir/scmroot/openblas'...
$ git fetch origin 4c0dcdd8a4110005c212d08d840d98808430dfbd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openblas
 * [new ref]         4c0dcdd8a4110005c212d08d840d98808430dfbd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4c0dcdd Fix FTBFS on ppc64le and s390x