Re: Shebang and python packages

[Tobias Geerinckx-Rice]

Phil,

Phil 写道：
> As I understand it, as python is not propagated there is no
> guarantee that the version of python will be persisted in the 
> store for
> the lifetime of the profile containing (just) the python app?

Inputs are used when *building* things, not to manage their 
outputs (artefacts) once installed to the store.

References, not inputs, are how Guix automatically keeps track of 
which installed store items are live and which ones can be safely 
garbage-collected.

A reference just means the string "/gnu/store/…-foo" occurs 
anywhere in "/gnu/store/…-bar".  A patched shebang would be such a 
reference, so Guix knows your application uses Python because 
/gnu/store/…-yourapp-a.b.c contains references to 
/gnu/store/…-python-x.y.z.

Propagated-inputs are a hack that says as much as ‘when the user 
installs package A, pretend like they also asked to install 
package B in the same profile’.  That is *not* a good thing!  It's 
a work-around for broken packages and packages that would be far 
too much work to package in a more Guixy way.  Propagation causes 
all sorts of problems and makes profiles more fragile.  Avoid it.

> Have I misunderstood this?

I think so, or maybe I'm misunderstanding your problem.  Have you 
observed a problem?

Kind regards,

T G-R

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