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You can now do: bash <(curl http://hydra-server/build/1238757/reproduce) to download and execute a script that reproduces a Hydra build locally. This script fetches all inputs (e.g. Git repositories) and then invokes nix-build. The downloaded sources are stored in /tmp/build-<buildid> and reused between invocations of the script. Any additional command line options are passed to nix-build. So bash <(curl http://hydra-server/build/1238757/reproduce) --run-env will drop you in a shell where you can interactively hack on the build, e.g. $ source $stdenv/setup $ set +e $ unpackPhase $ cd $sourceRoot $ configurePhase $ emacs foo.c & $ make and so on.