trinity-devel@lists.pearsoncomputing.net

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Month: October 2012

Re: [trinity-devel] Reduce packages size (was 3.5.13 SRU prerelease preparations)

From: Slávek Banko <slavek.banko@...>
Date: Fri, 12 Oct 2012 02:17:43 +0200
On Saturday 06 of October 2012 18:51:23 Slávek Banko wrote:
> On Saturday 29 of September 2012 04:05:43 Timothy Pearson wrote:
> > > On Friday 28 of September 2012 17:07:33 Timothy Pearson wrote:
> > >> Interesting!  Are you going to do this in the R14 packaging tree as
> > >> well?
> > >
> > > I assume that the change native => quilt could be used for the final
> > > R14 and
> > > certainly for subsequent SRU in R14. In order to use quilt also for the
> > > nightly-builds, it requires to modify scripts that you use to prepare
> > > packages for nigtly-builds.
> > >
> > > For example, it should need to change the version number used for base
> > > tarball "orig.tar.bz2" because it is not possible to use dash for a
> > > version
> > > of "upstream" package on Debian. Instead of
> > > 14.0.0-0debian11+r274+pr2~wheezy
> > > would have to be used, for example 14.0.0~r274 for the base tarball
> > > orig.tar.bz2. And distribution specific version would in this case be:
> > > 14.0.0~r274-0debian11~wheezy.
> > >
> > > It is therefore a question, whether is now a good time for such a
> > > change?
> > >
> > > Slavek
> > > --
> >
> > As this would require a change of the versioning scheme, now is not a
> > good time for the change.
> >
> > Tim
>
> Because for now, you can not change from native packages to quilt, I have
> two other ways to reduce packages size!
>
> __1__
>
> I tested that all currently supported distributions (Debian from Squeeze,
> Ubuntu from Lucid) have support for source packages using XZ compression.
> Switching from bzip2 to XZ can reduce source packages about 12%.
>
> If there are no objections, I can make this change immediately.
>
> __2__
>
> I noticed that although we use bzip2 compression for source packages inside
> binary packages are still gzip. I checked that there is also possibility to
> switch compression for binary packages. I tested, that except Lucid is
> possible to use inside binary packages XZ compression. For Lucid can be
> used bzip2. The need to use for Lucid a different compression is not a
> problem. I create rule that automatically selects compression by
> availability XZ:
>
> DEB_DH_BUILDDEB_ARGS = -- -Z$(shell dpkg-deb --help | grep -q ":.* xz[,.]"
> \ && echo xz || echo bzip2)
>
> Change from gzip to bzip2 (for Lucid) reduces binary packages by about 12%.
> Change to XZ (for all others) reduces binary packages by about 25%.
>
> If there are no objections, I add gradually this change to all packages.

I see no objection ... nor any other reaction.
The decision is entirely up to me?

Slavek
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