$ git clone -n https://src.fedoraproject.org/rpms/ceres-solver.git /var/lib/mock/f31-build-64083-29495/root/thebuilddir/tmp/scmroot/ceres-solver
Cloning into '/var/lib/mock/f31-build-64083-29495/root/thebuilddir/tmp/scmroot/ceres-solver'...
$ git reset --hard ec6b420667e742ff35a504274a6a943fcd903536
HEAD is now at ec6b420 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild