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