$ git clone -n https://src.fedoraproject.org/rpms/qrencode.git /var/lib/mock/f31-build-50852-27434/root/thebuilddir/tmp/scmroot/qrencode
Cloning into '/var/lib/mock/f31-build-50852-27434/root/thebuilddir/tmp/scmroot/qrencode'...
$ git reset --hard ab7bf0f2dfa4b4ccf836d596297072f04c2f5d1b
HEAD is now at ab7bf0f Add old version to sources