$ git clone -n https://src.fedoraproject.org/rpms/R-jpeg.git /var/lib/mock/f31-build-74003-31063/root/chroot_tmpdir/scmroot/R-jpeg
Cloning into '/var/lib/mock/f31-build-74003-31063/root/chroot_tmpdir/scmroot/R-jpeg'...
$ git reset --hard a40e5bd566e7c700afeeae1ef90b5c7ed63b6875
HEAD is now at a40e5bd - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild