$ git clone -n https://src.fedoraproject.org/rpms/jam.git /var/lib/mock/f31-build-111122-34116/root/chroot_tmpdir/scmroot/jam
Cloning into '/var/lib/mock/f31-build-111122-34116/root/chroot_tmpdir/scmroot/jam'...
$ git reset --hard e5e71ac962aa43751cf82c17cfdeb88908fb9711
HEAD is now at e5e71ac - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild