[Nix-dev] fixed-output derivation that *also* depend on (some of) its inputs?

[Vladimír Čunát]

On 09/20/2014 09:11 PM, Bjørn Forsman wrote:
> No, fetchurl wont re-download if you change url. You have to update
> the hash to force a re-download. That's by design, because changing
> the mirror shouldn't cause a mass rebuild. But my realization was that
> we could have made it depend on the*basename*  of url and still
> prevent a changing mirror to be mass-rebuild.
>
> For fetchurl this behaviour (ignoring inputs) is just a minor
> annoyance, but for packaging a grails app it completely breaks down.

When I change the basename (and leave the hash the same), fetchurl 
*will* re-download, because the output name of the file does change. (It 
will fail, so I see little point anyway.)

Vladimir


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