$ git clone -n https://src.fedoraproject.org/rpms/OpenSceneGraph.git /var/lib/mock/f38-build-side-42-init-devel-640029-26389/root/chroot_tmpdir/scmroot/OpenSceneGraph
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-640029-26389/root/chroot_tmpdir/scmroot/OpenSceneGraph'...
$ git fetch origin f50990eb20a63aed06900741d8c5ca2386dd905f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/OpenSceneGraph
 * [new ref]         f50990eb20a63aed06900741d8c5ca2386dd905f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f50990e Rebuild (mingw-poppler)