$ git clone -n https://src.fedoraproject.org/rpms/gstreamer1-plugins-bad-free.git /var/lib/mock/f40-build-2348626-60148/root/chroot_tmpdir/scmroot/gstreamer1-plugins-bad-free
Cloning into '/var/lib/mock/f40-build-2348626-60148/root/chroot_tmpdir/scmroot/gstreamer1-plugins-bad-free'...
$ git fetch origin a373edfcc58e011652515e016ff00e1d55383a90:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamer1-plugins-bad-free
 * [new ref]         a373edfcc58e011652515e016ff00e1d55383a90 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a373edf Patch upstreamed