$ git clone -n https://src.fedoraproject.org/rpms/rakudo-MIME-Base64.git /var/lib/mock/f29-build-3972-980/root/thebuilddir/tmp/scmroot/rakudo-MIME-Base64
Cloning into '/var/lib/mock/f29-build-3972-980/root/thebuilddir/tmp/scmroot/rakudo-MIME-Base64'...
$ git reset --hard c4b9ec3bb3fd00afa61937570826e4fea5956242
HEAD is now at c4b9ec3 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild