zstd and Mercurial packaging

[Augie Fackler]

> On Dec 1, 2016, at 08:53, Neal Becker <ndbecker2 at gmail.com> wrote:
> 
> Fedora guidelines: All packages whose upstreams allow them to be built against system libraries must be built against system libraries.
> 
> So if zstd could become a standard system library it would have to be unbundled.

That should be possible some day, but today we're depending on an as-yet unstable API that requires static linking against a specific version of the library. Is that sufficient to prevent unbundling for now?

> 
> On Wed, Nov 23, 2016 at 8:01 AM Dirkjan Ochtman <dirkjan at ochtman.nl <mailto:dirkjan at ochtman.nl>> wrote:
> On Tue, Nov 22, 2016 at 9:53 PM, Gregory Szorc <gregory.szorc at gmail.com <mailto:gregory.szorc at gmail.com>> wrote:
> > I'm sending this email to reach out to packagers so we have time to address
> > packaging concerns around zstd. I'm willing to make upstream changes to both
> > Mercurial and python-zstandard to ease packaging issues. Please read the
> > aforementioned commit messages to understand the vendoring decision and then
> > let me know if there is anything I can do to make your life easier.
> 
> Very interesting work!
> 
> On Gentoo Linux, we definitely prefer unbundling vendored libraries.
> For autotools build systems, we ideally get a --use-system-zstd or
> similar that will disable usage of the bundled dependencies and use
> the normal header and library path environment variable to find it.
> I'm not really sure how that fits into distutils stuff, though.
> 
> Given the static linking requirements between python-zstd and zstd, an
> easy improvement here would be to make the install of the bundled
> python-zstd optional, so that our package manager could just install
> the system python-zstd instead. In that case, it would be important
> that a requirements.txt or similar lists the version of python-zstd
> used, and ideally any changes to that version would also figure
> prominently in future changelogs.
> 
> Cheers,
> 
> Dirkjan
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