$ git clone -n https://src.fedoraproject.org/rpms/gstreamer1-rtsp-server.git /var/lib/mock/f42-build-side-1-3498642-45963/root/chroot_tmpdir/scmroot/gstreamer1-rtsp-server
Cloning into '/var/lib/mock/f42-build-side-1-3498642-45963/root/chroot_tmpdir/scmroot/gstreamer1-rtsp-server'...
$ git fetch origin 23e280c01c185ef7031ca0520b60f83f5ecb21ab:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamer1-rtsp-server
 * [new ref]         23e280c01c185ef7031ca0520b60f83f5ecb21ab -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 23e280c 1.26.0