Hi, How difficult is it to implement this?
While packaging an application that downloads a bunch of dependencies during the build (like all grails apps do), I realized that I needed this. What I did first was to write a fixed-output derivation to let the application download its deps. Then I "locked it down" by fixing the hash. But now the problem is that even when the application changes its dependency specification, nix will not attempt to download the new deps, because it *only* looks at the output hash. I really need it to consider some of its inputs too, because the dependency spec comes from the input (application source). IMHO, something like this could also be useful for fetchurl: Let's say we made it also depend on the *basename* of url, then it'd re-download on package bumps but *not* on mirror updates. (The fact that fetchurl ignores package bumps is slightly confusing.) Best regards, Bjørn Forsman _______________________________________________ nix-dev mailing list [email protected] http://lists.science.uu.nl/mailman/listinfo/nix-dev
