$ git clone -n https://src.fedoraproject.org/rpms/gmp-ecm.git /var/lib/mock/f31-build-64304-29541/root/chroot_tmpdir/scmroot/gmp-ecm
Cloning into '/var/lib/mock/f31-build-64304-29541/root/chroot_tmpdir/scmroot/gmp-ecm'...
$ git reset --hard 728e3765dc3702956fb163ecfb106c8849bff294
HEAD is now at 728e376 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild