$ git clone -n https://src.fedoraproject.org/rpms/nullmodem.git /var/lib/mock/f31-build-63689-29422/root/chroot_tmpdir/scmroot/nullmodem
Cloning into '/var/lib/mock/f31-build-63689-29422/root/chroot_tmpdir/scmroot/nullmodem'...
$ git reset --hard f67d865665f7c1a7ee34533080f9c89b09edfae3
HEAD is now at f67d865 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild