$ git clone -n https://src.fedoraproject.org/rpms/gstreamer1-plugins-bad-free.git /var/lib/mock/f40-build-2530028-61829/root/chroot_tmpdir/scmroot/gstreamer1-plugins-bad-free
Cloning into '/var/lib/mock/f40-build-2530028-61829/root/chroot_tmpdir/scmroot/gstreamer1-plugins-bad-free'...
$ git fetch origin 788feeafd3a109a250733d8b505e90cbe6737b90:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamer1-plugins-bad-free
 * [new ref]         788feeafd3a109a250733d8b505e90cbe6737b90 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 788feea Update BR