$ git clone -n https://src.fedoraproject.org/rpms/toolbox.git /var/lib/mock/f39-build-2092381-50270/root/chroot_tmpdir/scmroot/toolbox
Cloning into '/var/lib/mock/f39-build-2092381-50270/root/chroot_tmpdir/scmroot/toolbox'...
$ git fetch origin 6682165143201ac7ce7d57a52117e7b76147798f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/toolbox
 * [new ref]         6682165143201ac7ce7d57a52117e7b76147798f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6682165 Update to 0.0.99.5