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nix store optimise and nix store gc (and possibly other progress reporting commands) drop output #774

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opened 2025-03-26 19:45:21 +00:00 by lunaphied · 0 comments
lunaphied commented 2025-03-26 19:45:21 +00:00
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Describe the bug

There seems to be an issue with progress reporting nix3 commands in that if they print a final message after they complete, sometimes that message gets eaten. This clearly shouldn't happen as these commands are often long-running and when the user returns to the CLI they will not see what was completed.

Steps To Reproduce

  1. Run nix store optimise or nix store gc
  2. Observe the lacking multiple lines of output that should happen after the progress reporting has been completed.

Expected behavior

The final output messages (which for both are already specified in the code) should actually be displayed.

nix --version output

nix (Lix, like Nix) 2.93.0-dev (rev: f270d3ebe)

## Describe the bug There seems to be an issue with progress reporting nix3 commands in that if they print a final message after they complete, sometimes that message gets eaten. This clearly shouldn't happen as these commands are often long-running and when the user returns to the CLI they will not see what was completed. ## Steps To Reproduce 1. Run `nix store optimise` or `nix store gc` 2. Observe the lacking multiple lines of output that should happen after the progress reporting has been completed. ## Expected behavior The final output messages (which for both are already specified in the code) should actually be displayed. ## `nix --version` output `nix (Lix, like Nix) 2.93.0-dev` (rev: f270d3ebe)
lunaphied removed their assignment 2025-03-26 19:45:54 +00:00
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Affects/CppNix

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.

  
Affects/Nightly

Found in Lix nightly.

  
Affects/Only nightly

Tag for regressions in Lix nightly. We intend to fix all of these prior to releases.

  
Affects/Stable

Affects the stable release of Lix. Usually such issues affect nightly too but there is no guarantee.

  
Area/build-packaging

regarding the building or packaging of Lix itself

  
Area/cli

The command line interface of Lix

  
Area/evaluator

libexpr and anything else related to the evaluation of Nix expressions

  
Area/fetching

Fetching sources or other materials from the World Wide Web in Lix

  
Area/flakes

   
Area/language

language design, features, extensions, etc

  
Area/lix ci

Lix's own CI and deployment pipeline

  
Area/nix-eval-jobs

nix-eval-jobs for Lix

  
Area/profiles

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

  
Area/protocol

The protocol, used for communicating between the client and the daemon

  
Area/releng

Release engineering

  
Area/remote-builds

remote builds

  
Area/repl

nix repl

  
Area/repl/debugger

The --debugger that brings up a Lix repl

  
Area/store

libstore and anything else relating to the Nix store

  
bug

it's a bug

  
Context
contributors
This issue might require some context that isn't written down. It might be possible to handle as a person who already worked on this area.

  
Context
drive-by
This issue contains all the necessary information to do a drive-by contribution: that is, you don't have to talk with anyone at all to successfully solve it!

  
Context
maintainers
This issue requires a lot of know-how. Attention from maintainers is needed to proceed.

  
Context
RFD
This issue needs discussion from multiple maintainers and interested parties: it's a Request For Discussion.

  
crash 💥

Lix crashes (possibly bad error handling)

  
Cross Compilation

   
devx

development experience issues

  
docs

requires or is about documentation changes

  
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

  
E/hard

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

  
E/help wanted

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

  
E/reproducible

This bug is reproducible and obvious.

  
E/requires rearchitecture

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

  
imported

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

  
Language/Bash

   
Language/C++

   
Language/NixLang

   
Language/Python

   
Language/Rust

   
Needs Langver

We can't get to this until we implement language versioning

  
OS/Linux

Affects specifically Lix on Linux

  
OS/macOS

Affects specifically Lix on macOS

  
performance

make lix go faster

  
regression

This is a regression since some previous version of Lix

  
release-blocker

Blocks public release

  
stability

Fixing this makes the software more stable

  
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blocked
Blocked on something

  
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invalid
not our bug, duplicate, similar

  
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postponed
closed but should maybe look at later (generally with S-wontfix)

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

  
testing

Tests that should be added

  
testing/flakey

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

  
Topic/Large Scale Installations

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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crash 💥
Cross Compilation
devx
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E/requires rearchitecture
imported
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performance
regression
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Reference: lix-project/lix#774
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