bug#53805: 27.2; NonGNU ELPA: helm does not install dependencies

[Thierry Volpiatto <thievol@posteo.net>]

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Philip Kaludercic <philipk@posteo.net>, Thierry Volpiatto <thievol@posteo.net> writes:

> Thierry Volpiatto <thievol@posteo.net> writes:
>
>> Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of
>> text editors" <bug-gnu-emacs@gnu.org> writes:
>>
>>>> It seems to me that the core of the issue is that the ELPA build system
>>>> overrides the existing -pkg.el files, by trying to infer all the package
>>>> metadata from the main files (helm.el, helm-core.el).  If as in the case
>>>> of helm and helm-core these are empty, this leads to unexpected results.
>>>
>>> The best course of action is to fix the upstream.
>>> They simply shouldn't have any `<foo>-pkg.el` file.
>>
>> I disagree, in the simple case of async package this didn't cause problems, but
>> here it does because we have two packages (helm-core+helm) coming from
>> the same git repo.
>
> What is the issue in this case?  The ELPAs already have packages that
> share common upstream repositories.  The main issue here that I see is
> that helm.el and helm-core.el

There is no helm-core.el file.

> don't have Package-Requires headers, which is why the dependency list
> is currently empty.

Since long time I asked to not have such informations fetched from
source files but from pkg.el files, which is cleaner.
 
>>> We will generate the `<foo>-pkg.el` in any case because we include more
>>> information there than what the upstream will have put (e.g. we include
>>> the commit id from which the tarball is built),
>>
>> So what is the problem? Just append the informations fetched from the
>> upstream *pkg.el files to the *pkg.el file you are usually building.
>> I guess it is what Melpa does more or less.
>>
>>> and and modifying files that are under version control tends to lead
>>> to problems.
>>
>> You are anyway creating a new *pkg.el file so why do you want to modify
>> the original *pkg.el files?
>
> This is also what the patch I proposed above would do.  Or rather the
> -pkg file is parsed, and later overwritten.

Looks good.

-- 
Thierry

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