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8th chunk of `doc/release-notes/rl-2511.section.md`
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  * `$debug/lib/debug/.build-id/48/3bd7f7229bdb06462222e1e353e4f37e15c293.source` is a symlink to the value of `$src` during build
  * `$debug/lib/debug/.build-id/48/3bd7f7229bdb06462222e1e353e4f37e15c293.sourceoverlay` is a symlink to a directory with the same structure as the expanded `$sourceRoot` but containing only a copy of files which were patched during the build
  * `$debug/lib/debug/.build-id/48/3bd7f7229bdb06462222e1e353e4f37e15c293.debug` is the file containing debug symbols (like before).

- `fetchgit`: Add `rootDir` argument to limit the resulting source to one subdirectory of the whole Git repository. Corresponding `--root-dir` option added to `nix-prefetch-git`.

- `sftpman` has been updated to version 2, a rewrite in Rust which is mostly backward compatible but does include some changes to the CLI.
  For more information, [check the project's README](https://github.com/spantaleev/sftpman-rs#is-sftpman-v2-compatible-with-sftpman-v1).

- The `clickhouse` package now track the stable upstream version per [upstream's
  recommendation](https://clickhouse.com/docs/faq/operations/production). Users
  can continue to use the `clickhouse-lts` package if desired.

- `buildPythonPackage` and `buildPythonApplication` now default to `nix-update-script` as their default `updateScript`. This should improve automated updates, since nix-update is better maintained than the in-tree update script and has more robust fetcher support.

## Nixpkgs Library {#sec-nixpkgs-release-25.11-lib}

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- `mealie` has been updated to 3.0.2: This update introduces breaking changes in some API endpoints (see the [release changelog](https://github.com/mealie-recipes/mealie/releases/tag/v3.0.0)).

### Breaking changes {#sec-nixpkgs-release-25.11-lib-breaking}

- `reaction` has been updated to version 2, which includes some breaking changes.
  For more information, [check the release article](https://blog.ppom.me/en-reaction-v2).

- The `buildPythonPackage` and `buildPythonApplication` functions now require
  an explicit `format` attribute. Previously the default format used setuptools
  and called `setup.py` from the source tree, which is deprecated.
  The modern alternative is to configure `pyproject = true` with `build-system = [ setuptools ]`.

- `boot.enableContainers` is only turned on when a declarative NixOS container is defined in `containers`.
  If you use the `nixos-container` tool for imperative container management, set `boot.enableContainers = true;` explicitly.

### Deprecations {#sec-nixpkgs-release-25.11-lib-deprecations}

- `types.either` silently accepted mismatching types when used in `freeformType`. Module maintainers should fix the used type
  In most cases wrapping `either` with `attrsOf` should be sufficient.

  Since types.either was used to bootstrap other types. This also affects the following types:
  - `oneOf`
  - `number`
  - `numbers.*`

### Additions and Improvements {#sec-nixpkgs-release-25.11-lib-additions-improvements}

- `neovim`: Added support for the `vim.o.exrc` option, the `VIMINIT` environment variable, and sourcing of `sysinit.vim`.

  See the neovim help page [`:help startup`](https://neovim.io/doc/user/starting.html#startup) for more information, as well as [the nixpkgs neovim wrapper documentation](#neovim-custom-configuration).
Title: Nixpkgs Updates: Package Changes, Breaking Configurations, and Library Enhancements
Summary
This chunk details various updates and changes within Nixpkgs. Debugging capabilities are enhanced with symlinks for build-ids to source and ELF files, while `fetchgit` gains a `rootDir` argument. Several packages received updates: `sftpman` to a Rust-based v2, `clickhouse` now tracks stable upstream, `mealie` to v3.0.2 (with breaking API changes), and `reaction` to v2 (with breaking changes). Python package/application builds now default to `nix-update-script` for automation. Breaking changes include `buildPythonPackage` and `buildPythonApplication` requiring an explicit `format` attribute, and `boot.enableContainers` now only activating when declarative containers are defined. A deprecation notes that `types.either` silently accepted mismatching types in `freeformType`, affecting several other types. Finally, `neovim` received improvements, adding support for `vim.o.exrc`, `VIMINIT`, and `sysinit.vim`.