$ git clone -n https://src.fedoraproject.org/rpms/mathgl.git /var/lib/mock/f41-build-1702135-24562/root/chroot_tmpdir/scmroot/mathgl
Cloning into '/var/lib/mock/f41-build-1702135-24562/root/chroot_tmpdir/scmroot/mathgl'...
$ git fetch origin f27c6f2645aaa64f1298650369084971b5be13b6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mathgl
 * [new ref]         f27c6f2645aaa64f1298650369084971b5be13b6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f27c6f2 convert GPLv2+ license to SPDX