$ git clone -n https://src.fedoraproject.org/rpms/mathgl.git /var/lib/mock/f41-build-side-1-2969315-35818/root/chroot_tmpdir/scmroot/mathgl
Cloning into '/var/lib/mock/f41-build-side-1-2969315-35818/root/chroot_tmpdir/scmroot/mathgl'...
$ git fetch origin 10659735141970b7c3a6a613ebbfca63278e682c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mathgl
 * [new ref]         10659735141970b7c3a6a613ebbfca63278e682c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1065973 Link with flexiblas instead of gslcblas