[PATCH 2/2] XWin: Include a copy of GL specs, rather than downloading them

Gaetan Nadon memsize at videotron.ca
Tue Jan 11 14:27:56 PST 2011

On Tue, 2011-01-11 at 13:37 +0000, Jon TURNEY wrote:

> On 05/01/2011 21:05, Gaetan Nadon wrote:
> > On Wed, 2011-01-05 at 20:30 +0000, Jon TURNEY wrote:
> > 
> >> On 05/01/2011 14:25, Daniel Stone wrote:
> >>> Previously the XWin build required a live internet connection (and
> >>> Khronos's servers to not be down for maintenance, etc) in order to
> >>> download the (W)GL specs to autogenerate files from.  Even if you
> >>> weren't building XWin, this broke distcheck.
> >>>
> >>> It's a fairly upsetting diffstat, but not being able to distcheck on
> >>> the train makes me sad-in-pants.
> >>>
> >>> Signed-off-by: Daniel Stone <daniel-rLtY4a/8tF1rovVCs/uTlw-XMD5yJDbdMToUJ55TTLPZA at public.gmane.org.org>
> >>> ---
> >>>
> >>> Note that this is not the real patch: SMTP doesn't allow even 1024-character
> >>> lines, let alone 31488 characters (sigh).  The real patch can be found at:
> >>> git://people.freedesktop.org/~daniels/xserver in the master branch
> >>>
> >>> But you get the idea.
> >>
> >> Yes, this is pretty bad atm.  I'm not sure why I did things this way in the
> >> first place.  I think perhaps I was concerned about that I didn't know the
> >> license terms for those files and didn't want to get stuck with manually
> >> updating them.
> > 
> > It looks promising as the terms of the license are copied from the X11
> > license.
> > http://oss.sgi.com/projects/FreeB/SGIFreeSWLicB.2.0.pdf.
> > 
> > The build reproducibility is important. Various distros building X must
> > do so from the same source code.
> > Those building from tarballs expect the source code to be complete.
> > One should be able to rebuild a 2 year old server with the same 2 year
> > old gl spec.
> I'm not sure I totally buy this argument.  We don't include stdio.h to ensure
> that we can build with the version that was installed 2 years ago :-)
> (Although I'm sure this problem is solved by a package build system which
> audits the build dependencies)

It's all a matter of risk evaluation, how much you trust where the
source code it.
A download as you go approach is not practical for many due to network
In addition, you don't have versioning, so you can never be sure to be
to rebuild previous versions. You can't even be sure there will be
anything to download.

Having said this, I am not in a position to evaluate the risks and
decide if they are acceptable
or not. The patch you attached makes sense, it is similar to so many
"dev" packages that
are required to build some corners of xorg.

I appreciate you have taken the time to evaluate these issues.

Acked-by: Gaetan Nadon <memsize at videotron.ca>

> >> Perhaps it would be better to simply remove these files, and I should just
> >> create a package for cygwin containing these files, and then make that a
> >> build-time requirement?
> It makes me very uncomfortable to add a copy of those files, so here is an
> alternative patch which removes the downloading of the files, which hopefully
> fixes the distcheck problem, and the ~2.5 people who actually build XWin can
> ensure they are made available in an appropriate way.
> (I had a look at how Wine does this, as it needs to generate these same
> wrappers with the opposite thunking, to see if it did this in a better way,
> but unfortunately, that downloads the files also :-( [1] )
> [1] http://source.winehq.org/git/wine.git/?a=tree;f=dlls/opengl32
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