Cannot rely on /dev being present in %post scripts?

[David Woodhouse <dwmw2 infradead org>]

According to bug #517013, %post scripts should not assume that /dev is
available -- so we can't do anything that requires the existence of 
/dev/null, /dev/urandom, etc.

Is this a known and expected packaging rule, or is it a bug in the way
that the user is attempting to install the packages?

-- 
David Woodhouse                            Open Source Technology Centre
David Woodhouse intel com                              Intel Corporation