$ git clone -n https://src.fedoraproject.org/rpms/black-hole-solver.git /var/lib/mock/f31-build-111619-34187/root/chroot_tmpdir/scmroot/black-hole-solver
Cloning into '/var/lib/mock/f31-build-111619-34187/root/chroot_tmpdir/scmroot/black-hole-solver'...
$ git reset --hard 604faa1eec4b3d9937eb18e5db231e0e81fa5df5
HEAD is now at 604faa1 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild