[RFC/HEADSUP] portmaster default -w (preserve shared libraries)

[Bryan Drewery]

(As maintainer) I'm proposing to make -w the default for portmaster.
This will preserve old shared libraries when upgrading. This helps 2 things:

1. Prevents a broken system during upgrades
2. Prevents a broken system after upgrading for ports that did not get a
PORTREVISION bump from a shared library update.

You have certainly ran into this problem with large library updates such
as png, pcre, openssl, etc.

Portupgrade has always done this as default, and I have never seen any
problems arise from it. It also cleans up prevents duplicated library
versions. If portmaster is not already doing this, I will ensure it does.

You could then use pkg_libchk to rebuild any lingering ports if you
wanted to ensure your system was using the latest. Then cleanout the
preserved shared library.

Of course there will be a way to stick to the old default of not
preserving the libraries.

Someone may consider this a POLA violation, but I consider that a broken
system from missing libraries and PORTREVISION bumps is more of a POLA
violation.


The other option to ensuring that all ports work correctly after a
shared library update is to just rebuild any port which recursively is
affected by another port being updated. I think this is fine in
scenarios such as tinderbox/poudriere, but with end-user compiling ports
on their system, this may quickly become too much of a burden.


Regards,
Bryan Drewery


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