Re: [gentoo-portage-dev] Current portage well designed, but badly used

[Gustavo Barbieri <barbieri@gmail.com>]

On Sun, 28 Nov 2004 15:22:44 -0200, Gustavo Barbieri <barbieri@gmail.com> wrote:
> On Sun, 28 Nov 2004 05:44:50 +0000 (GMT), Ed Grimm
> <paranoid@gentoo.evolution.tgape.org> wrote:
> > On Sat, 27 Nov 2004, Gustavo Barbieri wrote:
> > > Some packages use numbering version padded with zero, that's good to
> > > list with shell functions, but it's bad because you can't change them
> > > to numbers and them back to string. For example:
> > > mail-mta/nullmailer-1.00_rc7-r4. If you Convert it to integers, it
> > > becomes 1.0 and you can't map back to the ebuild.
> >
> > It's worse than that.  They're not always integers.  It's safest to
> > treat version numbers as strings as much as possible; when one needs to
> > break them into integer portions, do this for comparison only, and save
> > the original.  Finally, a number of packages would require that you
> > provide a mechanism for determining all version numbers that aren't
> > strictly numeric.  Openssl, with its \d+.\d+.\d+[a-z] versions is easy.
> > hddtemp, with its alpha/beta tags, is doable but tedious.
> 
> I did a PackageVersion class that parses these sections using a
> regular expression following the package naming policy. I don't send
> the code since I'll need to recode it, my XFS lost many data after a
> power failure :( But I have the bytecode if you want to test it or
> help me to get the .py back.

Okay, I hacked a free version of  decompyle from BSD to support python
2.3 bytecode and recovered my file.

If you want to check it out:
http://ltc08.ic.unicamp.br/~gustavo/packagemanager.tar.bz2, the file
of interest is lib/packagemanager/packagemanagementsystem.py, there
are some classes, he PackageVersion is of interest, please look at it.
(if you don't want to get the package:
http://ltc08.ic.unicamp.br/~gustavo/packagemanagementsystem.py)


-- 
Gustavo Sverzut Barbieri
---------------------------------------
Computer Engineer 2001 - UNICAMP
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