Nix

How to patch

• https://github.com/NixOS/nixpkgs/issues/31684#issuecomment-345359776

How to override

• https://nixos.wiki/wiki/Overlays#Overriding_a_version
• https://stackoverflow.com/questions/65970915/how-can-i-override-a-package-source-in-nix

How to exclude several package from list

• https://github.com/NixOS/nixpkgs/issues/32405#issuecomment-639458076

List functions

• https://github.com/NixOS/nixpkgs/blob/893e5bd84c21a86c271864e6c26944f228d1ddb1/lib/lists.nix

Incremental build or partial cache for build phase

• AFAIK, nothing. https://discourse.nixos.org/t/incremental-builds/9988/4?u=kachick

How to get src path in packaging definition

"${src}"

$NIX_BUILD_TOP/$sourceRoot

How to edit nixpkgs

They put flake.nix with minimum packages. And .gitignores clarified.vscode and .envrc.
So I enable direnv for the purpose with putting following files.

echo 'use flake' > .envrc
mkdir -p .vscode
<.devcontainer/devcontainer.json | nu --stdin --commands 'from json | to json' | jq '.customizations.vscode.settings' > .vscode/settings.json

However nixd is only appears in devcontainer for now, so manually remove the entry or inject it in devshell

nix-shell --packages nixd --command zsh

Tips in nixpkgs

• desktop-file-edit https://github.com/NixOS/nixpkgs/pull/413657/files#r2132255008