$ git clone -n https://src.fedoraproject.org/rpms/mftrace.git /var/lib/mock/f31-build-86913-31718/root/thebuilddir/tmp/scmroot/mftrace
Cloning into '/var/lib/mock/f31-build-86913-31718/root/thebuilddir/tmp/scmroot/mftrace'...
$ git reset --hard ab2a89c5771a6daac501f732cbded910de9f9ad4
HEAD is now at ab2a89c Python 3.