$ git clone -n https://src.fedoraproject.org/rpms/olpc-os-builder.git /var/lib/mock/f31-build-65125-29637/root/chroot_tmpdir/scmroot/olpc-os-builder
Cloning into '/var/lib/mock/f31-build-65125-29637/root/chroot_tmpdir/scmroot/olpc-os-builder'...
$ git reset --hard 63b6ef55eebf5cf75529c014ac4bed2b4822a473
HEAD is now at 63b6ef5 update build deps, drop group