Upgrade script

[Kris Kennaway]

Actually this script is not doing enough: the problem is that even
after all the portrevisions will be bumped, a portupgrade -a will not
install most of the new xorg packages, and the user will be left with
a non-working hybrid (I guess no-one actually tested the upgrade part
yet :-).

i.e. when xorg-libraries is upgraded from 6.9 to 7.2, most of the
dependency checks for things that now live in sub-packages will pass
(since they look for files also installed by xorg 6.9), so most of the
new ports won't be installed.  I confirmed this on an attempted
upgrade of an xorg 6.9 machine.

What was necessary was the following:

# Make sure all dependencies are in consistent state
pkgdb -FL	

# This is over-complete, i.e. it removes some things it doesn't have
# to.  Should be replaced by pkg_delete -f.
pkg_deinstall -Rf xorg imake libGLU nvidia-driver

# Install new xorg from scratch.  Could be replaced by pkg_add -r xorg
# once packages are available.
portinstall -N xorg

# Patch up dependencies, i.e. register new dependencies on all the new
# sub-ports of the packages we didn't upgrade yet
pkgdb -FL	

Then portupgrade -a, which was probably not strictly necessary.

Kris

P.S. Dunno about non-portupgrade users, they may be SOL.
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