1 { sources ? import ./nix/sources.nix
2 , nixpkgs ? sources.nixpkgs
3 , pkgs ? import nixpkgs {}
11 packageOverrides = self: super: {
12 matplotlib = super.matplotlib.overridePythonAttrs(old: rec {
14 src = super.fetchPypi {
17 sha256 = "1brn3ism9755wibylb24yzs3b6ndg89iiclyhnvavxiiyhm7jjy9";
20 flask = super.flask.overridePythonAttrs(old: rec {
22 src = super.fetchPypi {
25 sha256 = "0j6f4a9rpfh25k1gp7azqhnni4mb4fgy50jammgjgddw1l3w0w92";
28 makeWrapperArgs+=(--set FLASK_NIX_HACK 1)
31 flask-cors = super.flask-cors.overridePythonAttrs(old: rec {
33 src = super.fetchPypi {
36 sha256 = "1v6gq4vjgyxi8q8lxawpdfhq01adb4bznnabp08ks5nzbwibz43y";
40 # Workarounds for two Flask/Nix-related errors when FLASK_DEBUG = 1.
42 # Error #1: `flask run` prints the following:
44 # File "/nix/store/iygklcrqcyshaq57ybizia55x70cn1vq-python3.7-Flask-1.0.2/bin/flask", line 2
45 # export PATH='/nix/store/wpw6qdjbrv7s72kk81n1lwf3vj6fldk2-python3-3.7.8/bin:/nix/store/iygklcrqcyshaq57ybizia55x70cn1vq-python3.7-Flask-1.0.2/bin'${PATH:+':'}$PATH
46 # SyntaxError: invalid syntax
48 # This can be fixed with updated version of
49 # https://github.com/NixOS/nixpkgs/issues/42924#issuecomment-409101368
50 # (need to prepend src/ in substituteInPlace)
52 # Error #2: After #1 is fixed, Flask complains about missing
53 # flask_cors. To solve this, we hardcode path to Flask wrapper
54 # script and use it if FLACK_NIX_HACK is set. People try to
55 # solve it properly at
56 # https://github.com/NixOS/nixpkgs/issues/72345#issuecomment-622244484
57 werkzeug = super.werkzeug.overrideAttrs (old: rec {
59 substituteInPlace src/werkzeug/_reloader.py \
60 --replace "rv = [sys.executable]" \
61 'if "FLASK_NIX_HACK" in os.environ: sys.argv[0] = os.path.join(os.path.dirname(sys.executable), "flask")
66 in pkgs.python37.override {inherit packageOverrides; self = python;};
68 in python.withPackages(ps: with ps; [
83 # Setting FLASK_APP this way work in nix-shell but not in lorri. Se
84 # we override the value in .envrc.
86 export FLASK_APP="$PWD/coffee-flask/app.py"