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bug#36614: rust@1.36's hash is incorrect.

From: Ivan Petkov
Subject: bug#36614: rust@1.36's hash is incorrect.
Date: Fri, 12 Jul 2019 17:59:29 -0700

> On Jul 12, 2019, at 10:26 AM, Tobias Geerinckx-Rice <address@hidden> wrote:
> Yes, this is exactly what happened.  I consider this is a feature of Guix, 
> even though it can feel like a gotcha sometimes.  :-)
> We often tend to think of the source URL(s) as an ‘identifier’ of the source 
> file.  However, it is nothing more than a hint about its *location*.  The 
> only authoritative identifier of its *content* is the hash: to get *this 
> file* (content hash), try looking *here* (location: URL).
> One origin may have 0 or more source URLs: Guix will try them all until it 
> downloads something matching the hash (and if even that fails it will try 
> some implicit ones like tarballs.nixos.org).
>   ‘Unique’ identifier (hash)
>     ├ maybe you can *find* it here (URL)
>     ├ or here (another URL)
>     ├ hell maybe here I don't know (yet another URL)
>     Guix cares only about the content of the file; it doesn't care or even 
> remember how it got it.  Or: if you change the download hint (release URL in 
> this case), Guix won't care, because you didn't change the hash.
> I hope that makes some sense,

This is a wonderful explanation, thanks! Will keep this in mind for the future 


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