$ git clone -n https://src.fedoraproject.org/rpms/g3kb-switch.git /var/lib/mock/f42-build-side-1-3508721-46015/root/chroot_tmpdir/scmroot/g3kb-switch
Cloning into '/var/lib/mock/f42-build-side-1-3508721-46015/root/chroot_tmpdir/scmroot/g3kb-switch'...
$ git fetch origin 02d89200c8ef0efe9222b85bc3a96aa8a961b832:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/g3kb-switch
 * [new ref]         02d89200c8ef0efe9222b85bc3a96aa8a961b832 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 02d8920 GNOME 48 support