ports/128754: [port infrastructure] implement master sites randomization

[Eygene Ryabinkin]

Tue, Nov 11, 2008 at 04:35:54PM +0100, Alexey Shuvaev wrote:
> On Tue, Nov 11, 2008 at 03:23:50AM +0000, RW wrote:
> > On Mon, 10 Nov 2008 18:56:16 +0300 (MSK)
> > I think it would be sensible to seed srand from a hash of something
> > reproducible to make better use of caches - maybe DISTNAME+DISTVERSION.
> >
> Maybe I don't understand something, but is RANDOMIZE_MASTER_SITES
> (see bsd.port.mk for details) not enough? It affects though all
> sites, not only SF.

It is enough, but it requires /usr/games/random to be present.  Not all
servers have 'games' distribution installed, but I want them to
randomize master sites.

For the feeding the hashes: RW, do you mean HTTP caches?  In principle,
this is a neat idea: it will achieve load-balancing between the sites.
But as it will use the same master sites order for the given port, this
will be failing when the first download site is almost down: the
download will take very long.  But probably stable order of the sites
can be made settable via the variable, e.g.
RANDOMIZE_MASTER_SITE_REPRODUCIBLY.  Will it be fine?  Please, note that
this can be achievable only for the awk script: random(6) can not be
currently directed to do this.
-- 
Eygene
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