nix-channel --quiet --update isn't quiet

[dseomn]

Describe the bug

nix-channel --quiet --update produces non-error output when it succeeds. From https://nix.dev/manual/nix/2.25/command-ref/opt-common, it looks like --quiet should prevent that.

Steps To Reproduce

$ sudo nix-channel --quiet --update 
unpacking channels...

Expected behavior

No output if the command succeeded.

Metadata

nix-env (Nix) 2.8.0

Additional context

This is on Debian 12.

Checklist

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

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[dseomn]

I found two more commands that aren't quiet. Should I file separate bugs for those?

$ sudo nix-env --quiet --upgrade
trace: evaluation warning: CUDA versions older than 12.0 will be removed in Nixpkgs 25.05; see the 24.11 release notes for more information
trace: evaluation warning: CUDA versions older than 12.0 will be removed in Nixpkgs 25.05; see the 24.11 release notes for more information
trace: evaluation warning: CUDA versions older than 12.0 will be removed in Nixpkgs 25.05; see the 24.11 release notes for more information
trace: evaluation warning: CUDA versions older than 12.0 will be removed in Nixpkgs 25.05; see the 24.11 release notes for more information
trace: evaluation warning: CUDA versions older than 12.0 will be removed in Nixpkgs 25.05; see the 24.11 release notes for more information
trace: evaluation warning: CUDA versions older than 12.0 will be removed in Nixpkgs 25.05; see the 24.11 release notes for more information
trace: evaluation warning: CUDA versions older than 12.0 will be removed in Nixpkgs 25.05; see the 24.11 release notes for more information
trace: evaluation warning: CUDA versions older than 12.0 will be removed in Nixpkgs 25.05; see the 24.11 release notes for more information
trace: evaluation warning: CUDA versions older than 12.0 will be removed in Nixpkgs 25.05; see the 24.11 release notes for more information
trace: evaluation warning: qt6Packages.stdenv is deprecated. Use stdenv instead.

$ sudo nix-store --quiet --gc
2257 store paths deleted, 9.64 MiB freed