$ git clone -n https://src.fedoraproject.org/rpms/g3kb-switch.git /var/lib/mock/f40-build-1134424-20444/root/chroot_tmpdir/scmroot/g3kb-switch
Cloning into '/var/lib/mock/f40-build-1134424-20444/root/chroot_tmpdir/scmroot/g3kb-switch'...
$ git fetch origin c24df68a5c5757e4138403f1c6e0109aa16a1c4e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/g3kb-switch
 * [new ref]         c24df68a5c5757e4138403f1c6e0109aa16a1c4e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c24df68 Update to 1.5 (rhbz#2283355)