Nixpkgs Library and Module System Updates (Additions, Improvements, Deprecations)

- [`lib.path.hasStorePathPrefix`](https://nixos.org/manual/nixpkgs/unstable#function-library-lib.path.hasStorePathPrefix): Whether a [path](https://nixos.org/manual/nix/stable/language/values.html#type-path) has a [store path](https://nixos.org/manual/nix/stable/store/store-path.html#store-path) as a prefix. - [`lib.filesystem.packagesFromDirectoryRecursive`](https://nixos.org/manual/nixpkgs/unstable#function-library-lib.filesystem.packagesFromDirectoryRecursive): Transform a directory tree containing package files suitable for `callPackage` into a matching nested attribute set of derivations. - [`lib.fileset.toList`](https://nixos.org/manual/nixpkgs/unstable#function-library-lib.fileset.toList): The list of file paths contained in a given file set. - [`lib.fileset.maybeMissing`](https://nixos.org/manual/nixpkgs/unstable#function-library-lib.fileset.maybeMissing): Create a file set from a path that may or may not exist. - [`lib.derivations.optionalDrvAttr`](https://nixos.org/manual/nixpkgs/unstable#function-library-lib.derivations.optionalDrvAttr): Conditionally set a derivation attribute. - [`lib.strings.makeIncludePath`](https://nixos.org/manual/nixpkgs/unstable#function-library-lib.strings.makeIncludePath): Construct an include search path (such as `C_INCLUDE_PATH`) containing the header files for a set of packages or paths. Improvements: - [`lib.fixedPoints.extends`](https://nixos.org/manual/nixpkgs/unstable#function-library-lib.fixedPoints.extends): Better documentation - [`lib.customisation.makeScope`](https://nixos.org/manual/nixpkgs/unstable/#function-library-lib.customisation.makeScope): Better documentation - [`lib.derivations.lazyDerivation`](https://nixos.org/manual/nixpkgs/unstable#function-library-lib.derivations.lazyDerivation): Now supports multiple outputs with an `outputs` argument - [`lib.gvariant`](https://nixos.org/manual/nixpkgs/unstable#sec-functions-library-gvariant): Better error message for integers and attribute set values - [`lib.filesets.gitTracked`](https://nixos.org/manual/nixpkgs/unstable#function-library-lib.fileset.gitTracked): Now works within store paths Misc: - The [`lib/` directory](https://github.com/NixOS/nixpkgs/tree/release-24.05/lib) is a self-contained flake now, including a working [`lib.trivial.version`](https://nixos.org/manual/nixpkgs/unstable/#function-library-lib.trivial.version) (but note that fetching a subtree by itself is not supported in Nix yet) - [Various minor performance improvements](https://github.com/NixOS/nixpkgs/issues?q=author%3Aadisbladis+label%3A%226.topic%3A+lib%22+created%3A%3C2024-05-31+) Module System: - New types: - [`types.attrTag`](https://nixos.org/manual/nixos/unstable/#sec-option-types-sums): A tagged union type - `types.nonEmptyListOf`: A non-empty list - Improved types: - `types.uniq`/`unique` now check the wrapped type ### Deprecations {#sec-release-24.05-lib-deprecations} - [`lib.options.mdDoc`](https://nixos.org/manual/nixpkgs/unstable#function-library-lib.options.mdDoc) is obsolete and now emits a warning. The core ecosystem has completely migrated to markdown, so marking markdown as markdown is redundant. - `lib.attrsets.zipWithNames` is now a deprecated alias of [`lib.attrsets.zipAttrsWithNames`](https://nixos.org/manual/nixpkgs/unstable/#function-library-lib.attrsets.zipAttrsWithNames) - `lib.attrsets.cartesianProductOfSets` has been renamed to [`lib.attrsets.cartesianProduct`](https://nixos.org/manual/nixpkgs/unstable/#function-library-lib.attrsets.cartesianProduct) ### Internal {#sec-release-24.05-lib-internal} - `lib` now has [Readme for contributing](https://github.com/NixOS/nixpkgs/tree/master/lib#readme). - Some function's documentation is now written using the [accepted doc comment syntax](https://github.com/NixOS/rfcs/pull/145). - `odoo` has been updated from `16.0.20231024` to `17.0.20240507`.

This chunk details additions, improvements, and deprecations in the Nixpkgs library and module system. New library functions include utilities for path handling (`hasStorePathPrefix`), file system operations (`packagesFromDirectoryRecursive`, `toList`, `maybeMissing`), derivation attribute management (`optionalDrvAttr`), and string manipulation (`makeIncludePath`). Existing functions like `lazyDerivation` gained multi-output support, `gvariant` improved error messages, and others received better documentation or broader applicability. The `lib/` directory is now a self-contained flake with minor performance gains. The module system introduces new types (`attrTag`, `nonEmptyListOf`) and improved existing ones. Deprecations include `lib.options.mdDoc` (obsolete) and renaming/aliasing of `zipWithNames` and `cartesianProductOfSets`. Internal changes involve a contributing Readme, updated doc comment syntax, and an Odoo version update.