release notes: 2.23.0

This commit is contained in:
Eelco Dolstra 2024-06-03 18:06:42 +02:00
parent da92ad7dd2
commit 754ea9058d
11 changed files with 103 additions and 120 deletions

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---
synopsis: "New builtin: `builtins.warn`"
issues: 306026
prs: 10592
---
`builtins.warn` behaves like `builtins.trace "warning: ${msg}"`, has an accurate log level, and is controlled by the options
[`debugger-on-trace`](@docroot@/command-ref/conf-file.md#conf-debugger-on-trace),
[`debugger-on-warn`](@docroot@/command-ref/conf-file.md#conf-debugger-on-warn) and
[`abort-on-warn`](@docroot@/command-ref/conf-file.md#conf-abort-on-warn).

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---
synopsis: Show all FOD errors with `nix build --keep-going`
---
`nix build --keep-going` now behaves consistently with `nix-build --keep-going`. This means
that if e.g. multiple FODs fail to build, all hash mismatches are displayed.

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---
synopsis: Modify `nix derivation {add,show}` JSON format
issues: 9866
prs: 10722
---
The JSON format for derivations has been slightly revised to better conform to our [JSON guidelines](@docroot@contributing/cli-guideline#returning-future-proof-json).
In particular, the hash algorithm and content addressing method of content-addresed derivation outputs is now separated into two fields `hashAlgo` and `method`,
rather than one field with an arcane `:`-separated format.
This JSON format is only used by the experimental `nix derivation` family of commands, at this time.
Future revisions are expected as the JSON format is still not entirely in compliance even after these changes.

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---
synopsis: Warn on unknown settings anywhere in the command line
prs: 10701
---
All `nix` commands will now properly warn when an unknown option is specified anywhere in the command line.
Before:
```console
$ nix-instantiate --option foobar baz --expr '{}'
warning: unknown setting 'foobar'
$ nix-instantiate '{}' --option foobar baz --expr
$ nix eval --expr '{}' --option foobar baz
{ }
```
After:
```console
$ nix-instantiate --option foobar baz --expr '{}'
warning: unknown setting 'foobar'
$ nix-instantiate '{}' --option foobar baz --expr
warning: unknown setting 'foobar'
$ nix eval --expr '{}' --option foobar baz
warning: unknown setting 'foobar'
{ }
```

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---
synopsis: "`nix env shell` is the new `nix shell`, and `nix shell` remains an accepted alias"
issues: 10504
prs: 10807
---
This is part of an effort to bring more structure to the CLI subcommands.
`nix env` will be about the process environment.
Future commands may include `nix env run` and `nix env print-env`.
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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---
synopsis: New-cli flake commands that expect derivations now print the failing value and its type
prs: 10778
---
In errors like `flake output attribute 'nixosConfigurations.yuki.config' is not a derivation or path`, the message now includes the failing value and type.
Before:
```
error: flake output attribute 'nixosConfigurations.yuki.config' is not a derivation or path
````
After:
```
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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---
synopsis: "`fetchTree` now fetches git repositories shallowly by default"
prs: 10028
---
`builtins.fetchTree` now clones git repositories shallowly by default, which reduces network traffic and disk usage significantly in many cases.
Previously, the default behavior was to clone the full history of a specific tag or branch (eg. `ref`) and only afterwards extract the files of one specific revision.
From now on, the `ref` and `allRefs` arguments will be ignored, except if shallow cloning is disabled by setting `shallow = false`.
The defaults for `builtins.fetchGit` remain unchanged. Here, shallow cloning has to be enabled manually by passing `shallow = true`.

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---
synopsis: Store object info JSON format now uses `null` rather than omitting fields.
prs: 9995
---
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.
For example, `"ca": null` is used to to indicate a store object that isn't content-addressed rather than omitting the `ca` field entirely.
This makes records of this sort more self-describing, and easier to consume programmatically.
We will follow this design principle going forward;
the [JSON guidelines](@docroot@/contributing/json-guideline.md) in the contributing section have been updated accordingly.

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---
synopsis: Large path warnings
prs: 10661
---
Nix can now warn when evaluation of a Nix expression causes a large
path to be copied to the Nix store. The threshold for this warning can
be configured using [the `warn-large-path-threshold`
setting](@docroot@/command-ref/conf-file.md#warn-large-path-threshold),
e.g. `--warn-large-path-threshold 100M` will warn about paths larger
than 100 MiB.

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@ -125,6 +125,7 @@
- [C++ style guide](contributing/cxx.md) - [C++ style guide](contributing/cxx.md)
- [Releases](release-notes/index.md) - [Releases](release-notes/index.md)
{{#include ./SUMMARY-rl-next.md}} {{#include ./SUMMARY-rl-next.md}}
- [Release 2.23 (2024-06-03)](release-notes/rl-2.23.md)
- [Release 2.22 (2024-04-23)](release-notes/rl-2.22.md) - [Release 2.22 (2024-04-23)](release-notes/rl-2.22.md)
- [Release 2.21 (2024-03-11)](release-notes/rl-2.21.md) - [Release 2.21 (2024-03-11)](release-notes/rl-2.21.md)
- [Release 2.20 (2024-01-29)](release-notes/rl-2.20.md) - [Release 2.20 (2024-01-29)](release-notes/rl-2.20.md)

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# Release 2.23.0 (2024-06-03)
- New builtin: `builtins.warn` [#306026](https://github.com/NixOS/nix/issues/306026) [#10592](https://github.com/NixOS/nix/pull/10592)
`builtins.warn` behaves like `builtins.trace "warning: ${msg}"`, has an accurate log level, and is controlled by the options
[`debugger-on-trace`](@docroot@/command-ref/conf-file.md#conf-debugger-on-trace),
[`debugger-on-warn`](@docroot@/command-ref/conf-file.md#conf-debugger-on-warn) and
[`abort-on-warn`](@docroot@/command-ref/conf-file.md#conf-abort-on-warn).
- Show all FOD errors with `nix build --keep-going`
`nix build --keep-going` now behaves consistently with `nix-build --keep-going`. This means
that if e.g. multiple FODs fail to build, all hash mismatches are displayed.
- Modify `nix derivation {add,show}` JSON format [#9866](https://github.com/NixOS/nix/issues/9866) [#10722](https://github.com/NixOS/nix/pull/10722)
The JSON format for derivations has been slightly revised to better conform to our [JSON guidelines](@docroot@contributing/cli-guideline#returning-future-proof-json).
In particular, the hash algorithm and content addressing method of content-addresed derivation outputs is now separated into two fields `hashAlgo` and `method`,
rather than one field with an arcane `:`-separated format.
This JSON format is only used by the experimental `nix derivation` family of commands, at this time.
Future revisions are expected as the JSON format is still not entirely in compliance even after these changes.
- Warn on unknown settings anywhere in the command line [#10701](https://github.com/NixOS/nix/pull/10701)
All `nix` commands will now properly warn when an unknown option is specified anywhere in the command line.
Before:
```console
$ nix-instantiate --option foobar baz --expr '{}'
warning: unknown setting 'foobar'
$ nix-instantiate '{}' --option foobar baz --expr
$ nix eval --expr '{}' --option foobar baz
{ }
```
After:
```console
$ nix-instantiate --option foobar baz --expr '{}'
warning: unknown setting 'foobar'
$ nix-instantiate '{}' --option foobar baz --expr
warning: unknown setting 'foobar'
$ nix eval --expr '{}' --option foobar baz
warning: unknown setting 'foobar'
{ }
```
- `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)
This is part of an effort to bring more structure to the CLI subcommands.
`nix env` will be about the process environment.
Future commands may include `nix env run` and `nix env print-env`.
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.
- New-cli flake commands that expect derivations now print the failing value and its type [#10778](https://github.com/NixOS/nix/pull/10778)
In errors like `flake output attribute 'nixosConfigurations.yuki.config' is not a derivation or path`, the message now includes the failing value and type.
Before:
```
error: flake output attribute 'nixosConfigurations.yuki.config' is not a derivation or path
````
After:
```
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» }
```
- `fetchTree` now fetches git repositories shallowly by default [#10028](https://github.com/NixOS/nix/pull/10028)
`builtins.fetchTree` now clones git repositories shallowly by default, which reduces network traffic and disk usage significantly in many cases.
Previously, the default behavior was to clone the full history of a specific tag or branch (eg. `ref`) and only afterwards extract the files of one specific revision.
From now on, the `ref` and `allRefs` arguments will be ignored, except if shallow cloning is disabled by setting `shallow = false`.
The defaults for `builtins.fetchGit` remain unchanged. Here, shallow cloning has to be enabled manually by passing `shallow = true`.
- Store object info JSON format now uses `null` rather than omitting fields. [#9995](https://github.com/NixOS/nix/pull/9995)
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.
For example, `"ca": null` is used to to indicate a store object that isn't content-addressed rather than omitting the `ca` field entirely.
This makes records of this sort more self-describing, and easier to consume programmatically.
We will follow this design principle going forward;
the [JSON guidelines](@docroot@/contributing/json-guideline.md) in the contributing section have been updated accordingly.
- Large path warnings [#10661](https://github.com/NixOS/nix/pull/10661)
Nix can now warn when evaluation of a Nix expression causes a large
path to be copied to the Nix store. The threshold for this warning can
be configured using [the `warn-large-path-threshold`
setting](@docroot@/command-ref/conf-file.md#warn-large-path-threshold),
e.g. `--warn-large-path-threshold 100M` will warn about paths larger
than 100 MiB.