NixOS/nix

Make `NarInfo` use `CompressionAlgo`

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#15022 opened on Jan 20, 2026

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 (8 comments) (0 reactions) (0 assignees)C++ (9,803 stars) (1,293 forks)batch import
good first issue

Description

See

Contributor guide

Tech stack
cpp
Domain
backendinfrastructure
Issue type
refactor
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
C++ knowledgefamiliarity with Nix internalsunderstanding of NarInfo and CompressionAlgo
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45
Research direction
Examine the referenced PR #15020 commits (especially 6ba067831a32ead02a40b1200702daef7212c48e) to understand the current state of NarInfo and CompressionAlgo. Look at the comments linked in the issue to identify what specific changes are needed. Then search the codebase for all usages of NarInfo to see how CompressionAlgo should be integrated. Discuss in the issue if any maintainer feedback is required to clarify the expected interface or implementation details.