non-child processes. This means you will not be able to attach gdb to an
  existing process, but will need to start that process from gdb (so it is a
  child). Or you can set `boot.kernel.sysctl."kernel.yama.ptrace_scope"` to 0.

- Lisp modules: previously deprecated interface based on `common-lisp.sh` has now been removed.

- The `systemd-confinement` module extension is now compatible with `DynamicUser=true` and thus `ProtectSystem=strict` too.


## Nixpkgs Library {#sec-release-24.05-nixpkgs-lib}

### Additions and Improvements {#sec-release-24.05-lib-additions-improvements}

New functions:
- [`lib.asserts.assertEachOneOf`](https://nixos.org/manual/nixpkgs/unstable#function-library-lib.asserts.assertEachOneOf): Check that each value is one of the allowed ones.
- [`lib.attrsets.longestValidPathPrefix`](https://nixos.org/manual/nixpkgs/unstable#function-library-lib.attrsets.longestValidPathPrefix): The longest prefix of an attribute path that refers to an existing attribute in a nesting of attribute sets.
- [`lib.attrsets.mapCartesianProduct`](https://nixos.org/manual/nixpkgs/unstable#function-library-lib.attrsets.mapCartesianProduct): Apply a function to the cartesian product of attribute set value combinations.
- [`lib.trivial.xor`](https://nixos.org/manual/nixpkgs/unstable#function-library-lib.trivial.xor): Boolean "exclusive or"
- [`lib.lists.ifilter0`](https://nixos.org/manual/nixpkgs/unstable#function-library-lib.lists.ifilter0): Filter a list for elements that satisfy a predicate function. The predicate function is called with both the index and value for each element.
- [`lib.lists.sortOn`](https://nixos.org/manual/nixpkgs/unstable#function-library-lib.lists.sortOn): Sort a list based on the default comparison of a derived property.
- [`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.