$ git clone -n https://src.fedoraproject.org/rpms/openmpi.git /var/lib/mock/f39-build-1899747-42824/root/chroot_tmpdir/scmroot/openmpi
Cloning into '/var/lib/mock/f39-build-1899747-42824/root/chroot_tmpdir/scmroot/openmpi'...
$ git fetch origin f61e50f9bd05623df15dbb27633f25f6c81c6a9e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openmpi
 * [new ref]         f61e50f9bd05623df15dbb27633f25f6c81c6a9e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f61e50f Added CMAKE_PREFIX_PATH to the module file