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* manual: Contributing -> Development, Hacking -> Building what's currently called "hacking" are really instructions for setting up a development environment and compiling from source. we have a contribution guide in the repo (which rightly focuses on GitHub workflows), and the material in the manual is more about working on the code itself. since we'd otherwise have three headings that amount to "Building Nix", this change also moves the "classic Nix" instructions to the top. we may want to reorganise this in the future, and bring contributor-oriented information closer to the code, but for now let's stick to more accurate names to ease navigation.
77 lines
4.5 KiB
Markdown
77 lines
4.5 KiB
Markdown
# Release 2.19 (2023-11-17)
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- The experimental `nix` command can now act as a [shebang interpreter](@docroot@/command-ref/new-cli/nix.md#shebang-interpreter)
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by appending the contents of any `#! nix` lines and the script's location into a single call.
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- [URL flake references](@docroot@/command-ref/new-cli/nix3-flake.md#flake-references) now support [percent-encoded](https://datatracker.ietf.org/doc/html/rfc3986#section-2.1) characters.
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- [Path-like flake references](@docroot@/command-ref/new-cli/nix3-flake.md#path-like-syntax) now accept arbitrary unicode characters (except `#` and `?`).
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- The experimental feature `repl-flake` is no longer needed, as its functionality is now part of the `flakes` experimental feature. To get the previous behavior, use the `--file/--expr` flags accordingly.
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- There is a new flake installable syntax `flakeref#.attrPath` where the "." prefix specifies that `attrPath` is interpreted from the root of the flake outputs, with no searching of default attribute prefixes like `packages.<SYSTEM>` or `legacyPackages.<SYSTEM>`.
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- Nix adds `apple-virt` to the default system features on macOS systems that support virtualization. This is similar to what's done for the `kvm` system feature on Linux hosts.
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- Add a new built-in function [`builtins.convertHash`](@docroot@/language/builtins.md#builtins-convertHash).
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- `nix-shell` shebang lines now support single-quoted arguments.
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- `builtins.fetchTree` is now its own experimental feature, [`fetch-tree`](@docroot@/development/experimental-features.md#xp-fetch-tree).
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This allows stabilising it independently of the rest of what is encompassed by [`flakes`](@docroot@/development/experimental-features.md#xp-fetch-tree).
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- The interface for creating and updating lock files has been overhauled:
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- [`nix flake lock`](@docroot@/command-ref/new-cli/nix3-flake-lock.md) only creates lock files and adds missing inputs now.
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It will *never* update existing inputs.
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- [`nix flake update`](@docroot@/command-ref/new-cli/nix3-flake-update.md) does the same, but *will* update inputs.
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- Passing no arguments will update all inputs of the current flake, just like it already did.
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- Passing input names as arguments will ensure only those are updated. This replaces the functionality of `nix flake lock --update-input`
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- To operate on a flake outside the current directory, you must now pass `--flake path/to/flake`.
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- The flake-specific flags `--recreate-lock-file` and `--update-input` have been removed from all commands operating on installables.
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They are superceded by `nix flake update`.
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- Commit signature verification for the [`builtins.fetchGit`](@docroot@/language/builtins.md#builtins-fetchGit) is added as the new [`verified-fetches` experimental feature](@docroot@/development/experimental-features.md#xp-feature-verified-fetches).
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- [`nix path-info --json`](@docroot@/command-ref/new-cli/nix3-path-info.md)
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(experimental) now returns a JSON map rather than JSON list.
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The `path` field of each object has instead become the key in the outer map, since it is unique.
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The `valid` field also goes away because we just use `null` instead.
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- Old way:
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```json5
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[
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{
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"path": "/nix/store/8fv91097mbh5049i9rglc73dx6kjg3qk-bash-5.2-p15",
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"valid": true,
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// ...
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},
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{
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"path": "/nix/store/wffw7l0alvs3iw94cbgi1gmmbmw99sqb-home-manager-path",
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"valid": false
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}
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]
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```
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- New way
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```json5
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{
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"/nix/store/8fv91097mbh5049i9rglc73dx6kjg3qk-bash-5.2-p15": {
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// ...
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},
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"/nix/store/wffw7l0alvs3iw94cbgi1gmmbmw99sqb-home-manager-path": null,
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}
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```
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This makes it match `nix derivation show`, which also maps store paths to information.
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- When Nix is installed using the [binary installer](@docroot@/installation/installing-binary.md), in supported shells (Bash, Zsh, Fish)
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[`XDG_DATA_DIRS`](https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html#variables) is now populated with the path to the `/share` subdirectory of the current profile.
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This means that command completion scripts, `.desktop` files, and similar artifacts installed via [`nix-env`](@docroot@/command-ref/nix-env.md) or [`nix profile`](@docroot@/command-ref/new-cli/nix3-profile.md)
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(experimental) can be found by any program that follows the [XDG Base Directory Specification](https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html).
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- A new command `nix store add` has been added. It replaces `nix store add-file` and `nix store add-path` which are now deprecated.
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