$ git clone -n https://src.fedoraproject.org/rpms/gstreamer1.git /var/lib/mock/f40-build-787465-134776/root/chroot_tmpdir/scmroot/gstreamer1
Cloning into '/var/lib/mock/f40-build-787465-134776/root/chroot_tmpdir/scmroot/gstreamer1'...
$ git fetch origin 6753ded97a34433fb1f5b86b03548b3ad66dfd08:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamer1
 * [new ref]         6753ded97a34433fb1f5b86b03548b3ad66dfd08 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6753ded Merge branch 'rawhide' of ssh://pkgs.fedoraproject.org/rpms/gstreamer1 into rawhide