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Deprecate hacky way of making structured attrs

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The method tested for in the previous commit is now deprecated.

Co-authored-by: Eelco Dolstra <edolstra@gmail.com>
This commit is contained in:
John Ericson 2025-05-26 13:54:04 -04:00
parent a353b2f4b2
commit 7577d2d3ae
5 changed files with 18 additions and 1 deletions
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doc/manual/rl-next/deprecate__json.md Normal file
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---
synopsis: Deprecate manually making structured attrs with `__json = ...;`
prs: [13220]
---
The proper way to create a derivation using [structured attrs] in the Nix language is by using `__structuredAttrs = true` with [`builtins.derivation`].
However, by exploiting how structured attrs are implementated, it has also been possible to create them by setting the `__json` environment variable to a serialized JSON string.
This sneaky alternative method is now deprecated, and may be disallowed in future versions of Nix.
[structured attrs]: @docroot@/language/advanced-attributes.md#adv-attr-structuredAttrs
[`builtins.derivation`]: @docroot@/language/builtins.html#builtins-derivation