[Rpm-maint] [rpm] initial embedded python interpreter support (@rpm5.org derived) (#25)

[Vít Ondruch]

Dne 28.11.2015 v 14:37 Neal Gompa napsal(a):
> On Thu, Nov 26, 2015 at 5:20 AM, Florian Festi <ffesti at redhat.com
> <mailto:ffesti at redhat.com>>wrote:
>
>     On 11/19/2015 04:09 PM, Vít Ondruch wrote:
>     > What is the usecase for this? Isn't this just feature bloat?
>
>     I kinda agree that this looks like feature bloat. This patch set
>     needs a
>     very good justification to go in upstream. The overall trend is to
>     rather keep minimal installs smaller as this is a big issue for
>     containers and VMs. Python is one of the candidates to be thrown
>     out at
>     some point.
>
>     Also embedding a particular version of Python into rpm itself
>     makes this
>     Python version part of the spec syntax with all kind of possibly ugly
>     implications.
>
>     It also seems to not bring many benefits except from saving the
>     interpreter starting time (which can be significant if there are many
>     Python scriptlets). But the trend here is also to rather getting
>     rid of
>     more of the scriptlets using the new file trigger feature (We'll
>     see how
>     this works out).
>
>     Having access to the transaction objects of the running rpm instance
>     could give such justification as it can hardly done in any other way.
>     But I really, really doubt that we wan to go down that route.
>     Especially
>     as it gives a whole new way of how scriptlets can break a transaction.
>
>     As the patch set is not interfering with many places in the rpm
>     code it
>     should be not too hard to maintain the changes outside of the upstream
>     repository for distributions with (still) rely on this feature.
>
>     Florian
>
>
> ​So the main justification for the Python stuff is less about
> scriptlets and more about being able to have templates for spec files.
> In OpenMandriva, for instance, the distro-release package[0]​ includes
> a Python script that is used by the main spec file at build-time (not
> run-time!) to construct the complete spec customized for a particular
> distribution (as there's actually at least three different
> distributions hosted and built through OpenMandriva's ABF system).
> There's no really nice way to do this with the existing RPM feature set.
>
> The ways I've seen this done in the absence of this feature (and I
> have seen it attempted a few times before) are pretty terrible. It's
> usually a combination of macros, bconds, and a whole bunch of other
> crazy things to make it work, and it's an unmanageable mess.

So what are the other ways? Could you share them with us?

And why not use LUA?

Vít

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