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nix-build no longer follows log-format option #1099

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opened 2026-01-08 16:16:13 +00:00 by tom-hubrecht · 1 comment
tom-hubrecht commented 2026-01-08 16:16:13 +00:00
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Describe the bug

Since lix-project/lix@b97b2e858b it is no longer possible to change the log format for the nix2 cli interface, it will always be raw-with-logs this is in contrast to the nix3 interface where it works as intended

Steps To Reproduce

  1. Run nix-build --log-format internal-json toto.nix
  2. Observe that no json is ever shown

Expected behavior

Nix correctly following the required log format

nix --version output

nix (Lix, like Nix) 2.95.0-b97b2e858babef00faa46fa557d9afe9e089a12a

## Describe the bug Since https://git.lix.systems/lix-project/lix/commit/b97b2e858babef00faa46fa557d9afe9e089a12a it is no longer possible to change the log format for the `nix2` cli interface, it will always be `raw-with-logs` this is in contrast to the `nix3` interface where it works as intended ## Steps To Reproduce 1. Run `nix-build --log-format internal-json toto.nix` 2. Observe that no json is ever shown ## Expected behavior Nix correctly following the required log format ## `nix --version` output nix (Lix, like Nix) 2.95.0-b97b2e858babef00faa46fa557d9afe9e089a12a
lix-bot commented 2026-01-08 16:30:14 +00:00
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This issue was mentioned on Gerrit on the following CLs:

  • commit message in cl/4888 ("fix(log-format): Apply the required setting with the nix2 cli")
<!-- GERRIT_LINKBOT: {"cls": [{"backlink": "https://gerrit.lix.systems/c/lix/+/4888", "number": 4888, "kind": "commit message"}], "cl_meta": {"4888": {"change_title": "fix(log-format): Apply the required setting with the nix2 cli"}}} --> This issue was mentioned on Gerrit on the following CLs: * commit message in [cl/4888](https://gerrit.lix.systems/c/lix/+/4888) ("fix(log-format): Apply the required setting with the nix2 cli")
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Probably affects CppNix. This is a best-effort tag for troubles in old code; it exists to inform the CppNix team about problems they might care about also.

  
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Found in Lix nightly.

  
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regarding the building or packaging of Lix itself

  
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libexpr and anything else related to the evaluation of Nix expressions

  
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profiles: nix-env, nix profile, and installer flavors all alike

  
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Lix crashes (possibly bad error handling)

  
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Downstream Dependents

regarding an external tool's usage with Lix (e.g. nix-eval-jobs)

  
E/easy

bug is relatively simple and could simply be fixed with some minor effort

  
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this issue should probably be solved with close involvement of an expert

  
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maintainers may not get to this soon, but we want it fixed

  
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This bug is reproducible and obvious.

  
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this bug cannot be fixed properly without fixing a known architectural flaw

  
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S3 support in Lix

  
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Issue imported from upstream nix (please do not remove this label, it will cause dupes if import is rerun)

  
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Affects specifically Lix on Linux

  
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performance

make lix go faster

  
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stability

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We chose not to change this (see issue comments for more detail).

  
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Tests that are unreliable/flakey (not to be confused with flakes that test)

  
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Large scale installations of Lix, e.g. NixOS Hydra, Lix CI, big corporate installations etc.

  
ux

makes the user experience better :)

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lix-project/lix#1099
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