$ git clone -n https://src.fedoraproject.org/rpms/gfxstream.git /var/lib/mock/f41-build-723962-13112/root/chroot_tmpdir/scmroot/gfxstream
Cloning into '/var/lib/mock/f41-build-723962-13112/root/chroot_tmpdir/scmroot/gfxstream'...
$ git fetch origin 82827d3b2afef2375524a8a68fd4347c2d9c651c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gfxstream
 * [new ref]         82827d3b2afef2375524a8a68fd4347c2d9c651c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 82827d3 Initial import