The Nix Hour #1 [nixcon, reviewing a PR, debugging and tracing Nix evaluation]
Это был первый публичный час Nix, который Сильван Мосбергер провел 2022-10-22 на Nixcon 2022 под названием QA Nix Lecture: https://talks.nixcon.org/nixcon-2022/... "Час Никса" - это еженедельная импровизированная лекция о Nix в стиле вопросов и ответов для начинающих, на которой вы можете задать свои вопросы, а мы ответим на них с подробным описанием контекста, примерами, альтернативами, компромиссами и смежными темами. "Час Никса" проводится каждую неделю, он открыт для публики, записывается и загружается на YouTube-канал Tweag. Для получения дополнительной информации ознакомьтесь с https://discourse.nixos.org/t/the-nix... 0:00 Initial look at PR 186314 2:35 Markdown documentation in NixOS options 3:05 Systemd unit types and index manpage 4:14 Another look at the PR 6:04 Pattern for handling enumerations 8:03 lib.partition for splitting a list of values into two 10:05 lib.groupBy for splitting a list of values into more subsets 12:30 Following lib.groupBy with a lib.mapAttrs 13:22 Trying to figure out the evaluation error without reading the error message 14:53 Adding tracing using lib.debug.traceSeq 16:49 nix-instantiate flags relating to lazy/strict evaluation 17:56 Realizing the problem, missing --strict with --json 18:20 nix eval strictness 19:09 Setup to demonstrate problem with nix eval strictness compared to nix-instantiate 20:24 nix repl derivation output 22:00 Demonstrating problem with nix eval strictness compared to nix-instantiate 24:12 Using the GitHub CLI to check out PR 186314 25:13 Trying to do a "quick" refactoring using lib.groupBy and the enum handling pattern from earlier 32:27 How to find documentation for nixpkgs library functions 33:49 Except for Nix builtin functions re-exported from the nixpkgs library 34:38 How to find documentation for Nix builtin functions 35:16 nix repl :doc command for Nix builtin function docs 35:51 Starting a failed attempt at trying to add documentation to re-exported builtin functions 36:56 Trying out the Nix debugger 38:55 Working around a problem in the Nix debugger relating to builtins.tryEval 40:11 Inspecting variables in the error 40:32 Changing to another trace in the stack 41:45 Resuming the failed attempt at trying to add documentation for re-exported builtin functions 43:02 Trying to use the doc Makefile for more incremental builds 46:59 Looking closer at lib.debug 50:45 Trying out lib.generators.toPretty 51:40 Looking at builtins.seq and builtins.deepSeq 53:53 Looking at the implementation of builtins.seq 55:26 The strictness of attribute keys and list sizes https://github.com/tweag
Это был первый публичный час Nix, который Сильван Мосбергер провел 2022-10-22 на Nixcon 2022 под названием QA Nix Lecture: https://talks.nixcon.org/nixcon-2022/... "Час Никса" - это еженедельная импровизированная лекция о Nix в стиле вопросов и ответов для начинающих, на которой вы можете задать свои вопросы, а мы ответим на них с подробным описанием контекста, примерами, альтернативами, компромиссами и смежными темами. "Час Никса" проводится каждую неделю, он открыт для публики, записывается и загружается на YouTube-канал Tweag. Для получения дополнительной информации ознакомьтесь с https://discourse.nixos.org/t/the-nix... 0:00 Initial look at PR 186314 2:35 Markdown documentation in NixOS options 3:05 Systemd unit types and index manpage 4:14 Another look at the PR 6:04 Pattern for handling enumerations 8:03 lib.partition for splitting a list of values into two 10:05 lib.groupBy for splitting a list of values into more subsets 12:30 Following lib.groupBy with a lib.mapAttrs 13:22 Trying to figure out the evaluation error without reading the error message 14:53 Adding tracing using lib.debug.traceSeq 16:49 nix-instantiate flags relating to lazy/strict evaluation 17:56 Realizing the problem, missing --strict with --json 18:20 nix eval strictness 19:09 Setup to demonstrate problem with nix eval strictness compared to nix-instantiate 20:24 nix repl derivation output 22:00 Demonstrating problem with nix eval strictness compared to nix-instantiate 24:12 Using the GitHub CLI to check out PR 186314 25:13 Trying to do a "quick" refactoring using lib.groupBy and the enum handling pattern from earlier 32:27 How to find documentation for nixpkgs library functions 33:49 Except for Nix builtin functions re-exported from the nixpkgs library 34:38 How to find documentation for Nix builtin functions 35:16 nix repl :doc command for Nix builtin function docs 35:51 Starting a failed attempt at trying to add documentation to re-exported builtin functions 36:56 Trying out the Nix debugger 38:55 Working around a problem in the Nix debugger relating to builtins.tryEval 40:11 Inspecting variables in the error 40:32 Changing to another trace in the stack 41:45 Resuming the failed attempt at trying to add documentation for re-exported builtin functions 43:02 Trying to use the doc Makefile for more incremental builds 46:59 Looking closer at lib.debug 50:45 Trying out lib.generators.toPretty 51:40 Looking at builtins.seq and builtins.deepSeq 53:53 Looking at the implementation of builtins.seq 55:26 The strictness of attribute keys and list sizes https://github.com/tweag