$ git clone -n https://src.fedoraproject.org/rpms/gstreamer1-rtsp-server.git /var/lib/mock/f45-build-13126-446/root/chroot_tmpdir/scmroot/gstreamer1-rtsp-server
Cloning into '/var/lib/mock/f45-build-13126-446/root/chroot_tmpdir/scmroot/gstreamer1-rtsp-server'...
$ git fetch origin 1d561d0900a13b67709319b6eecca7b7b5350fbd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamer1-rtsp-server
 * [new ref]         1d561d0900a13b67709319b6eecca7b7b5350fbd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1d561d0 1.28.6