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nixpkgs/lib
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Robert Hensing b8435108e1 lib/path/tests: Fix test setup on darwin 
These statements are taken from the `lib/test/release.nix` tests,
which previously also worked on darwin.

Unblocks https://github.com/NixOS/nix/pull/8569 when backported
2023-08-11 17:08:16 +02:00
..
path lib/path/tests: Fix test setup on darwin 2023-08-11 17:08:16 +02:00
systems Merge pull request #244330 from thillux/bluefield2-remove-cpu 2023-07-24 05:50:46 +00:00
tests Merge pull request #243139 from hercules-ci/modules-test-default-argument 2023-08-02 20:12:37 +02:00
ascii-table.nix strings: add escapeQuery for url encoding 2023-03-03 20:48:55 +01:00
asserts.nix doc: auto-generate asserts and attrset library docs 2022-12-08 22:58:22 +01:00
attrsets.nix lib.attrsets.mergeAttrsList: init 2023-07-18 20:27:15 +02:00
cli.nix
customisation.nix Revert "lib.customisation: uncurry makeScopeWithSplicing" 2023-07-28 23:04:09 +02:00
debug.nix lib/debug: remove unused let bindings 2023-06-23 09:41:04 +00:00
default.nix lib/options: remove literalDocBook 2023-06-13 16:56:30 +02:00
deprecated.nix lib.closePropagation: Remove the quadratic behavior in lib.closePropagation 2022-10-07 18:03:42 +02:00
derivations.nix lib.derivations: fix comment typo 2023-06-02 23:57:30 +08:00
fetchers.nix
filesystem.nix lib/filesystem: remove unused let bindings 2023-06-23 09:41:04 +00:00
fixed-points.nix doc: Render lib.fixedPoints 2023-07-08 18:46:08 +02:00
flake.nix Fix import path. 2021-08-14 14:46:00 -05:00
generators.nix lib/generators/toKeyValue: add indent parameter 2023-07-22 13:49:30 +02:00
kernel.nix lib.kernel.unset: init 2023-05-01 10:23:42 +00:00
licenses.nix licenses: add Hippocratic License v3.0 2023-07-07 12:37:12 +02:00
lists.nix lib.lists.commonPrefix: init 2023-07-20 22:42:01 +02:00
meta.nix treewide: update mainProgram docs 2023-08-04 20:31:16 +03:00
minver.nix boostrap fetchurl: Add SRI support 2022-08-24 09:55:45 +02:00
modules.nix Merge pull request #245271 from sternenseemann/module-system-merge-no-type 2023-07-27 10:55:08 +02:00
options.nix lib: turn *MD functions into aliases 2023-06-13 16:56:32 +02:00
README.md lib: Add README 2023-07-18 17:22:42 +02:00
source-types.nix lib.sourceTypes: simplify implementation 2022-05-30 16:27:34 +08:00
sources.nix lib/sources: remove unused let bindings 2023-06-23 09:41:04 +00:00
strings-with-deps.nix
strings.nix lib: simplify stringToCharacters 2023-06-22 18:27:15 -04:00
trivial.nix Merge pull request #235625 from ShamrockLee/lib-doc-tidy 2023-08-10 12:00:36 +02:00
types.nix lib.types.string: Use lib.warn instead of deprecationMessage 2023-08-10 06:31:36 +02:00
versions.nix lib/versions: add pad 2022-12-21 12:58:21 +01:00
zip-int-bits.nix lib/zip-int-bits: fix typo: bitXOR -> bitXor 2022-06-09 20:04:37 +03:00

README.md

Nixpkgs lib

This directory contains the implementation, documentation and tests for the Nixpkgs lib library.

Overview

The evaluation entry point for lib is default.nix. This file evaluates to an attribute set containing two separate kinds of attributes:

  • Sub-libraries: Attribute sets grouping together similar functionality. Each sub-library is defined in a separate file usually matching its attribute name.

    Example: lib.lists is a sub-library containing list-related functionality such as lib.lists.take and lib.lists.imap0. These are defined in the file lists.nix.

  • Aliases: Attributes that point to an attribute of the same name in some sub-library.

    Example: lib.take is an alias for lib.lists.take.

Most files in this directory are definitions of sub-libraries, but there are a few others:

  • minver.nix: A string of the minimum version of Nix that is required to evaluate Nixpkgs.
  • tests: Tests, see Running tests
    • release.nix: A derivation aggregating all tests
    • misc.nix: Evaluation unit tests for most sub-libraries
    • *.sh: Bash scripts that run tests for specific sub-libraries
    • All other files in this directory exist to support the tests
  • systems: The lib.systems sub-library, structured into a directory instead of a file due to its complexity
  • path: The lib.path sub-library, which includes tests as well as a document describing the design goals of lib.path
  • All other files in this directory are sub-libraries

Module system

The module system spans multiple sub-libraries:

  • modules.nix: lib.modules for the core functions and anything not relating to option definitions
  • options.nix: lib.options for anything relating to option definitions
  • types.nix: lib.types for module system types

Reference documentation

Reference documentation for library functions is written above each function as a multi-line comment. These comments are processed using nixdoc and rendered in the Nixpkgs manual. The nixdoc README describes the comment format.

See the chapter on contributing to the Nixpkgs manual for how to build the manual.

Running tests

All library tests can be run by building the derivation in tests/release.nix:

nix-build tests/release.nix

Some commands for quicker iteration over parts of the test suite are also available:

# Run all evaluation unit tests in tests/misc.nix
# if the resulting list is empty, all tests passed
nix-instantiate --eval --strict tests/misc.nix

# Run the module system tests
tests/modules.sh

# Run the lib.sources tests
tests/sources.sh

# Run the lib.filesystem tests
tests/filesystem.sh

# Run the lib.path property tests
path/tests/prop.sh