$ git clone -n https://src.fedoraproject.org/rpms/xdelta.git /var/lib/mock/f29-build-1643-568/root/thebuilddir/tmp/scmroot/xdelta
Cloning into '/var/lib/mock/f29-build-1643-568/root/thebuilddir/tmp/scmroot/xdelta'...
$ git reset --hard 624d9ca69a63a266c0deea34ba486c0415e8771c
HEAD is now at 624d9ca - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild