$ git clone -n https://src.fedoraproject.org/rpms/openvdb.git /var/lib/mock/f41-build-813998-148830/root/chroot_tmpdir/scmroot/openvdb
Cloning into '/var/lib/mock/f41-build-813998-148830/root/chroot_tmpdir/scmroot/openvdb'...
$ git fetch origin 58fe5e75a34b9af173d4a0380601f9fcbfae9af2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openvdb
 * [new ref]         58fe5e75a34b9af173d4a0380601f9fcbfae9af2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 58fe5e7 Fix tbb requirement for devel subpackage (rhbz#2296365)