$ git clone -n https://src.fedoraproject.org/rpms/gstreamer1-plugin-libav.git /var/lib/mock/f41-build-846112-162967/root/chroot_tmpdir/scmroot/gstreamer1-plugin-libav
Cloning into '/var/lib/mock/f41-build-846112-162967/root/chroot_tmpdir/scmroot/gstreamer1-plugin-libav'...
$ git fetch origin 0d10137c1229659a4d041a9d0c96103206bfcb48:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamer1-plugin-libav
 * [new ref]         0d10137c1229659a4d041a9d0c96103206bfcb48 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0d10137 1.24.7