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This is needed to avoid this https://github.com/mesonbuild/meson/issues/13774 when we go back to making our subproject directory `src`.
102 lines
5.6 KiB
Markdown
102 lines
5.6 KiB
Markdown
# Release 2.23.0 (2024-06-03)
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- New builtin: `builtins.warn` [#306026](https://github.com/NixOS/nix/issues/306026) [#10592](https://github.com/NixOS/nix/pull/10592)
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`builtins.warn` behaves like `builtins.trace "warning: ${msg}"`, has an accurate log level, and is controlled by the options
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[`debugger-on-trace`](@docroot@/command-ref/conf-file.md#conf-debugger-on-trace),
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[`debugger-on-warn`](@docroot@/command-ref/conf-file.md#conf-debugger-on-warn) and
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[`abort-on-warn`](@docroot@/command-ref/conf-file.md#conf-abort-on-warn).
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- Make `nix build --keep-going` consistent with `nix-build --keep-going`
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This means that if e.g. multiple fixed-output derivations fail to
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build, all hash mismatches are displayed.
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- Modify `nix derivation {add,show}` JSON format [#9866](https://github.com/NixOS/nix/issues/9866) [#10722](https://github.com/NixOS/nix/pull/10722)
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The JSON format for derivations has been slightly revised to better conform to our [JSON guidelines](@docroot@/development/cli-guideline.md#returning-future-proof-json).
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In particular, the hash algorithm and content addressing method of content-addresed derivation outputs are now separated into two fields `hashAlgo` and `method`,
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rather than one field with an arcane `:`-separated format.
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This JSON format is only used by the experimental `nix derivation` family of commands, at this time.
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Future revisions are expected as the JSON format is still not entirely in compliance even after these changes.
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- Warn on unknown settings anywhere in the command line [#10701](https://github.com/NixOS/nix/pull/10701)
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All `nix` commands will now properly warn when an unknown option is specified anywhere in the command line.
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Before:
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```console
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$ nix-instantiate --option foobar baz --expr '{}'
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warning: unknown setting 'foobar'
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$ nix-instantiate '{}' --option foobar baz --expr
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$ nix eval --expr '{}' --option foobar baz
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{ }
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```
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After:
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```console
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$ nix-instantiate --option foobar baz --expr '{}'
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warning: unknown setting 'foobar'
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$ nix-instantiate '{}' --option foobar baz --expr
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warning: unknown setting 'foobar'
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$ nix eval --expr '{}' --option foobar baz
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warning: unknown setting 'foobar'
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{ }
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```
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- `nix env shell` is the new `nix shell`, and `nix shell` remains an accepted alias [#10504](https://github.com/NixOS/nix/issues/10504) [#10807](https://github.com/NixOS/nix/pull/10807)
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This is part of an effort to bring more structure to the CLI subcommands.
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`nix env` will be about the process environment.
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Future commands may include `nix env run` and `nix env print-env`.
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It is also somewhat analogous to the [planned](https://github.com/NixOS/nix/issues/10504) `nix dev shell` (currently `nix develop`), which is less about environment variables, and more about running a development shell, which is a more powerful command, but also requires more setup.
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- Flake operations that expect derivations now print the failing value and its type [#10778](https://github.com/NixOS/nix/pull/10778)
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In errors like `flake output attribute 'nixosConfigurations.yuki.config' is not a derivation or path`, the message now includes the failing value and type.
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Before:
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```
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error: flake output attribute 'nixosConfigurations.yuki.config' is not a derivation or path
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````
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After:
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```
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error: expected flake output attribute 'nixosConfigurations.yuki.config' to be a derivation or path but found a set: { appstream = «thunk»; assertions = «thunk»; boot = { bcache = «thunk»; binfmt = «thunk»; binfmtMiscRegistrations = «thunk»; blacklistedKernelModules = «thunk»; bootMount = «thunk»; bootspec = «thunk»; cleanTmpDir = «thunk»; consoleLogLevel = «thunk»; «43 attributes elided» }; «48 attributes elided» }
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```
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- `fetchTree` now fetches Git repositories shallowly by default [#10028](https://github.com/NixOS/nix/pull/10028)
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`builtins.fetchTree` now clones Git repositories shallowly by default, which reduces network traffic and disk usage significantly in many cases.
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Previously, the default behavior was to clone the full history of a specific tag or branch (e.g. `ref`) and only afterwards extract the files of one specific revision.
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From now on, the `ref` and `allRefs` arguments will be ignored, except if shallow cloning is disabled by setting `shallow = false`.
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The defaults for `builtins.fetchGit` remain unchanged. Here, shallow cloning has to be enabled manually by passing `shallow = true`.
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- Store object info JSON format now uses `null` rather than omitting fields [#9995](https://github.com/NixOS/nix/pull/9995)
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The [store object info JSON format](@docroot@/protocols/json/store-object-info.md), used for e.g. `nix path-info`, no longer omits fields to indicate absent information, but instead includes the fields with a `null` value.
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For example, `"ca": null` is used to indicate a store object that isn't content-addressed rather than omitting the `ca` field entirely.
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This makes records of this sort more self-describing, and easier to consume programmatically.
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We will follow this design principle going forward;
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the [JSON guidelines](@docroot@/development/json-guideline.md) in the contributing section have been updated accordingly.
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- Large path warnings [#10661](https://github.com/NixOS/nix/pull/10661)
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Nix can now warn when evaluation of a Nix expression causes a large
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path to be copied to the Nix store. The threshold for this warning can
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be configured using [the `warn-large-path-threshold`
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setting](@docroot@/command-ref/conf-file.md#conf-warn-large-path-threshold),
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e.g. `--warn-large-path-threshold 100M` will warn about paths larger
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than 100 MiB.
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