$ git clone -n https://src.fedoraproject.org/rpms/gnome-panel.git /var/lib/mock/f40-build-2218176-52593/root/chroot_tmpdir/scmroot/gnome-panel
Cloning into '/var/lib/mock/f40-build-2218176-52593/root/chroot_tmpdir/scmroot/gnome-panel'...
$ git fetch origin c8f86041ce9680c5640ce1cac3dfa639206cb1b9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-panel
 * [new ref]         c8f86041ce9680c5640ce1cac3dfa639206cb1b9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c8f8604 https://fedoraproject.org/wiki/Changes/EncourageI686LeafRemoval