$ git clone -n https://src.fedoraproject.org/rpms/xxdiff.git /var/lib/mock/f29-build-6937-1706/root/thebuilddir/tmp/scmroot/xxdiff
Cloning into '/var/lib/mock/f29-build-6937-1706/root/thebuilddir/tmp/scmroot/xxdiff'...
$ git reset --hard 2c2b91d569d85bfe2d687e40d1cf77173f85b88a
HEAD is now at 2c2b91d - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild