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Diffstat (limited to 'flake.nix')
-rw-r--r-- | flake.nix | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/flake.nix b/flake.nix new file mode 100644 index 0000000..3c153d3 --- /dev/null +++ b/flake.nix @@ -0,0 +1,42 @@ +{ + description = "A very basic flake for developing in python"; + # Provides abstraction to boiler-code when specifying multi-platform outputs. + inputs = { + flake-utils.url = "github:numtide/flake-utils"; + nixpkgs.url = "github:nixos/nixpkgs"; + }; + outputs = { self, nixpkgs, flake-utils }: + flake-utils.lib.eachDefaultSystem (system: let + pkgs = nixpkgs.legacyPackages.${system}; + venvDir = "./.venv"; + pythonPackages = pkgs.python38Packages; + in { + devShell = pkgs.mkShell { + nativeBuildInputs = with pkgs; [ + hello + pythonPackages.python + ]; + shellHook = '' + SOURCE_DATE_EPOCH=$(date +%s) + + if [ -d "${venvDir}" ]; then + echo "Skipping venv creation, '${venvDir}' already exists" + else + echo "Creating new venv environment in path: '${venvDir}'" + # Note that the module venv was only introduced in python 3, so for 2.7 + # this needs to be replaced with a call to virtualenv + ${pythonPackages.python.interpreter} -m venv "${venvDir}" + fi + + # Under some circumstances it might be necessary to add your virtual + # environment to PYTHONPATH, which you can do here too; + # PYTHONPATH=$PWD/${venvDir}/${pythonPackages.python.sitePackages}/:$PYTHONPATH + + source "${venvDir}/bin/activate" + + # As in the previous example, this is optional. + pip install -r requirements.txt + ''; + }; + }); +} |