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Re: on cabal revisions

From: Ricardo Wurmus
Subject: Re: on cabal revisions
Date: Fri, 14 Jun 2019 22:12:23 +0200
User-agent: mu4e 1.2.0; emacs 26.2


>> What I’m imagining is something roughly like this:
>>    (source
>>      (origin
>>        (method url-fetch)
>>        (uri “”))
>>        (sha256 …))
>>      (origin
>>        (destination “package.cabal”)
>>        (method url-fetch)
>>        (uri “”)
>>        (sha256 …)))
>> probably with some way to specify how the sources should be
>> combined, by default unpacking over the previous result
>> sequentially. Would that be possible? A good idea even?
> This makes sense, but I’m not sure it’s a common enough use case to
> warrant a specialized interface.  Besides these Cabal revisions, only a
> handful of packages (that I’ve seen) need to download extra non-patch
> stuff.

One notorious class of packages that could benefit from a general
mechanism like this: the TeX Live packages.  They consist of various
subsets of a big SVN repository.  Currently, we pick an arbitrary
directory of the SVN repository as the main source and add all the other
locations as native inputs.

I wanted to add a procedure that accepts multiple locations in the SVN
repository, creates a union, and computes the single hash of the union.
This would make the texlive-* packages a lot simpler.


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