Builds can now specify the attribute "isDeterministic = true" to tell Hydra to build with build-repeat > 0. If there is a mismatch between rounds, the step / build fails with a suitable status. Maybe this should be a meta attribute, but that makes it invisible to hydra-queue-runner, and it seems reasonable to make a claim of mandatory determinism part of the derivation (since e.g. enabling this flag should trigger a rebuild).
Hydra
Hydra is a continuous integration system based on the Nix package manager. For more information, see the manual.
For development see [hacking instructions] (http://nixos.org/hydra/manual/#chap-hacking).
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