Re: Old 0install can't run an alias created by a newer version

On Sat, May 23, 2015 at 7:41 PM, Thomas Leonard <[email protected]> wrote:

> On 20 May 2015 at 01:06, Tim Cuthbertson <[email protected]> wrote:
> > I'm mostly using the development ocaml version on my own machine. But
> > sometimes I end up running a released python (or even ocaml) version.
> > Unfortunately, this means I can't run any of my newer aliases, as I get:
> >
> > Traceback (most recent call last):
> >   File "/home/tim/dev/0install/zi-stable/0install", line 14, in <module>
> >     main(sys.argv[1:])
> >   File "/home/tim/dev/0install/zi-stable/zeroinstall/cmd/__init__.py",
> line
> > 381, in main
> >     cmd.handle(config, options, args)
> >   File "/home/tim/dev/0install/zi-stable/zeroinstall/cmd/run.py", line
> 39,
> > in handle
> >     r = app.get_requirements()
> >   File "/home/tim/dev/0install/zi-stable/zeroinstall/apps.py", line 389,
> in
> > get_requirements
> >     setattr(r, k, v)
> > AttributeError: 'Requirements' object has no attribute 'may_compile'
> >
> >
> > I guess this is my fault for running multiple versions of 0install, but
> > that's actually difficult to avoid sometimes. In some cases I end up
> inside
> > a shell (e.g 0env) which is making use of the old python ZeroInstall.xml
> > feed, so the python 0install ends up on my path. In other cases, I run
> the
> > released version of 0install (e.g on my mac laptop) but I have a single
> > ~/.config/0install/ that I share between machines via a git repo.
> >
> >
> > I'm not sure what should be done about this. Some options:
> >
> > 1) only save requirement flags which are explicitly specified at creation
> > time, and rely on the defaults for other flags
> >
> > 2) ignore requirement keys which we don't understand, for forwards
> > compatibility.
> >
> > (1) is probably harder, but (2) opens us up to silently ignoring
> important
> > requirements. So I'd vote for (1).
>
> (1) sounds right to me too. Looks like we already do it for some of
> the options (e.g. --os):
>
>
> https://github.com/0install/0install/blob/d9c8219d603176a77d2650322f7054463b1c58c6/ocaml/zeroinstall/requirements.ml#L102
>
>
Cool, I've extended this to make the the may_compile attribute optional as
well.
PR is here: https://github.com/0install/0install/pull/38

Cheers,
 - Tim.

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