1 { sources ? import ./nix/sources.nix
2 , nixpkgs ? sources.nixpkgs
3 , pkgs ? import nixpkgs {}
11 packageOverrides = self: super: {
12 matplotlib = (super.matplotlib.override { enableTk = false; }).overridePythonAttrs(old: rec {
14 src = super.fetchPypi {
17 sha256 = "1c15g3rhnp4pn46akwzqqgrwvalhsy44zi3nd169x4i2djvpsiry";
20 # qhull library in nixpkgs in newer than expected by matplotlib 3.3.4 and has a different name
21 postPatch = old.postPatch + ''
22 substituteInPlace setupext.py --replace 'ext.libraries.append("qhull")' 'ext.libraries.append("qhull_r")'
25 flask = super.flask.overridePythonAttrs(old: rec {
27 src = super.fetchPypi {
30 sha256 = "0j6f4a9rpfh25k1gp7azqhnni4mb4fgy50jammgjgddw1l3w0w92";
33 makeWrapperArgs+=(--set FLASK_NIX_HACK 1)
36 flask-cors = super.flask-cors.overridePythonAttrs(old: rec {
38 src = super.fetchPypi {
41 sha256 = "1v6gq4vjgyxi8q8lxawpdfhq01adb4bznnabp08ks5nzbwibz43y";
44 jinja2 = super.jinja2.overridePythonAttrs(old: rec {
46 src = old.src.override {
48 sha256 = "1iiklf3wns67y5lfcacxma5vxfpb7h2a67xbghs01s0avqrq9md6";
52 # Workarounds for two Flask/Nix-related errors when FLASK_DEBUG = 1.
54 # Error #1: `flask run` prints the following:
56 # File "/nix/store/iygklcrqcyshaq57ybizia55x70cn1vq-python3.7-Flask-1.0.2/bin/flask", line 2
57 # export PATH='/nix/store/wpw6qdjbrv7s72kk81n1lwf3vj6fldk2-python3-3.7.8/bin:/nix/store/iygklcrqcyshaq57ybizia55x70cn1vq-python3.7-Flask-1.0.2/bin'${PATH:+':'}$PATH
58 # SyntaxError: invalid syntax
60 # This can be fixed with updated version of
61 # https://github.com/NixOS/nixpkgs/issues/42924#issuecomment-409101368
62 # (need to prepend src/ in substituteInPlace)
64 # Error #2: After #1 is fixed, Flask complains about missing
65 # flask_cors. To solve this, we hardcode path to Flask wrapper
66 # script and use it if FLACK_NIX_HACK is set. People try to
67 # solve it properly at
68 # https://github.com/NixOS/nixpkgs/issues/72345#issuecomment-622244484
69 werkzeug = super.werkzeug.overrideAttrs (old: rec {
71 substituteInPlace src/werkzeug/_reloader.py \
72 --replace "rv = [sys.executable]" \
73 'if "FLASK_NIX_HACK" in os.environ: sys.argv[0] = os.path.join(os.path.dirname(sys.executable), "flask")
78 in pkgs.python39.override {inherit packageOverrides; self = python;};
80 in python.withPackages(ps: with ps; [
81 flake8 # For syntax checking while editing .py files
97 # Setting FLASK_APP this way work in nix-shell but not in lorri. Se
98 # we override the value in .envrc.
100 export FLASK_APP="$PWD/coffee-flask/app.py"