nix path-info --json output changed

[flokli]

Describe the bug

It looks like the output of nix path-info --json did change accidentially (?)

With Nix 2.3 (and current Lix), it looks like this:

[{"path":"/nix/store/j7j8pwi5l7yw2aag07m2jz9saamhjx78-ncdu-2.8.2","valid":false}]

Current Nix shows it like this:

{"/nix/store/j7j8pwi5l7yw2aag07m2jz9saamhjx78-ncdu-2.8.2":null}

I didn't find any mention in the release notes of this breaking change.

The Nix 2.23 release notes mention a change in the JSON to not omit empty keys, but instead show them as nil, but this seems to be unrelated, there was never a mention of restructuring this output from using path: to using the path itself as a key.

My gut feeling is this broke in a random refactor an there was no test to catch it, but I didn't bisect yet.

Steps To Reproduce

Run nix path-info --json on a path, doesn't matter if valid or not. The format has moved to become a dict with the store paths as keys, where previously it was a list of dicts with a path key.

Expected behavior

Metadata

Additional context

Checklist

• checked latest Nix manual (source)
• checked open bug issues and pull requests for possible duplicates

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[flokli]

Ok, apparently my search foo isn't as good as @emilazy 's, and it is indeed intentional and documented in cc46ea1.