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Dev environment with nix and direnv

Install nix

Install the nix package manager, by running

curl https://nixos.org/nix/install | sh

or better, verify integrity of the installer script first according to https://nixos.org/nix/download.html.

If you would like to set up python manually run

nix-shell nix/shell.nix

from the project root and nix will install all system dependencies and make them available in your current shell. Then continue with the Installation from source <installation_from_source> section.

You can also let direnv take care of activating the nix shell and a python virtual environment for you.

Install direnv

Install direnv for instance by running

nix-env -iA nixpkgs.direnv

Hook it into your shell

eval "$(direnv hook bash)"  # for bash
eval "$(direnv hook zsh)"   # for zsh
eval (direnv hook fish)     # for fish

and add that line into ~/.bashrc (or equivalent) for future use if desired.

Activate direnv

Run

ln -s nix/envrc-nix-python .envrc
direnv allow

which will

  1. Fetch all system dependencies with nix if necessary.
  2. Activate the nix shell.
  3. Create a python virtualenv for the project if necessary.

Now each time you cd into this directory, direnv will activate this environment.

Run

make install-dev

to install the dependencies in requirements-dev.txt and raiden itself.