Re: [gentoo-dev] [pre-GLEP] Split distfile mirror directory structure

[Michael Orlitzky <mjo@gentoo.org>]

On 01/26/2018 06:24 PM, Michał Górny wrote:
> 
> The alternate option of using file hash has the advantage of having
> a more balanced split.  Furthermore, since hashes are stored
> in Manifests using them is zero-cost.  However, this solution has two
> significant disadvantages:
> 
> 1. The hash values are unknown for newly-downloaded distfiles, so
>    ``repoman`` (or an equivalent tool) would have to use a temporary
>    directory before locating the file in appropriate subdirectory.
> 
> 2. User-provided distfiles (e.g. for fetch-restricted packages) with
>    hash mismatches would be placed in the wrong subdirectory,
>    potentially causing confusing errors.
> 

The filename proposal sounds fine, so this is only academic, but: are
these two points really disadvantages?

What are we worried about in using a temporary directory? Copying across
filesystem boundaries? Except in rare cases, $DISTDIR itself will be
usable a temporary location (on the same filesystem), won't it?

For the second point, portage is going to tell me where to put the file,
isn't it? Then no matter what garbage I download, won't portage look for
it in the right place, because where-to-put-it is determined using the
same manifest hash that determines where-to-find-it?