$ git clone -n https://src.fedoraproject.org/rpms/gstreamer1-plugins-good.git /var/lib/mock/f39-build-1697496-41182/root/chroot_tmpdir/scmroot/gstreamer1-plugins-good
Cloning into '/var/lib/mock/f39-build-1697496-41182/root/chroot_tmpdir/scmroot/gstreamer1-plugins-good'...
$ git fetch origin 4a5b5e514ecdb60ae34bb88342c5dbff6bc2fa11:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gstreamer1-plugins-good
 * [new ref]         4a5b5e514ecdb60ae34bb88342c5dbff6bc2fa11 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4a5b5e5 Merge branch 'rawhide' into f39