$ git clone -n https://src.fedoraproject.org/rpms/FlightGear.git /var/lib/mock/f31-build-103106-33604/root/thebuilddir/tmp/scmroot/FlightGear
Cloning into '/var/lib/mock/f31-build-103106-33604/root/thebuilddir/tmp/scmroot/FlightGear'...
$ git reset --hard 795065b5234c664c4cb94abc5b2b7b0421621b08
HEAD is now at 795065b new upstream release