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Hard to get attrs of something having an outPath attribute with --json output format #773

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opened 2025-03-26 18:37:57 +00:00 by jade · 0 comments
jade commented 2025-03-26 18:37:57 +00:00
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Currently the --json output squashes everything that looks like a derivation into its outPath. This is frustrating if you want the attributes.

There should ideally be some way to get the attributes of things, though, note #772 makes this a little tricky: in most practical cases you don't want to evaluate derivation attrs.

Maybe the real solution is something (RPC) better than this....

$ nix eval --expr '{outPath = "meow"; foo = 4;}' --json
"meow"
Currently the `--json` output squashes everything that looks like a derivation into its outPath. This is frustrating if you want the attributes. There should ideally be some way to get the attributes of things, though, note https://git.lix.systems/lix-project/lix/issues/772 makes this a little tricky: in most practical cases you don't *want* to evaluate derivation attrs. Maybe the real solution is something (RPC) better than this.... ``` $ nix eval --expr '{outPath = "meow"; foo = 4;}' --json "meow" ```
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Reference: lix-project/lix#773
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