$ git clone -n https://src.fedoraproject.org/rpms/coin-or-Blis.git /var/lib/mock/f42-build-3273924-41313/root/chroot_tmpdir/scmroot/coin-or-Blis
Cloning into '/var/lib/mock/f42-build-3273924-41313/root/chroot_tmpdir/scmroot/coin-or-Blis'...
$ git fetch origin 6463e00cd8c45184f2959d4b2bff263b7f028ec8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/coin-or-Blis
 * [new ref]         6463e00cd8c45184f2959d4b2bff263b7f028ec8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6463e00 Orphaned for 6+ weeks