$ git clone -n https://src.fedoraproject.org/rpms/python-gstreamer1.git /var/lib/mock/f40-build-2676114-67851/root/chroot_tmpdir/scmroot/python-gstreamer1
Cloning into '/var/lib/mock/f40-build-2676114-67851/root/chroot_tmpdir/scmroot/python-gstreamer1'...
$ git fetch origin bffd3fdef84fcfb4a51ae765e0d0f49d34008334:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/python-gstreamer1
 * [new ref]         bffd3fdef84fcfb4a51ae765e0d0f49d34008334 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bffd3fd Revert "1.23.1"