On 09/20/2014 09:55 PM, Bjørn Forsman wrote:
Since fetchurl (via the nixos tarball mirror) downloads the same old file (even though it creates a new store path), the result outputHash is the same as before. So evaluation doesn't stop but continues on with old/wrong data.
If fetchurl *did* download any other data, then it would fail while checking the hash. That was my point. Nixos tarball mirror may be different and download the same content, but in any case that doesn't change the plain fact of the first sentence of this paragraph.
I think we all agree on how fetchurl works, but I still have no idea what you desire. I may be an exception, but I don't see what could be done "between" the current fixed-output and standard derivations. Either you do know what exactly the output should look like and then it doesn't really matter how you arrive at it, or you don't know it and then you have a standard derivation.
Vladimir
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