Error messages are sent to stdout, not to stderr

[Susticle]

Describe the Bug

When installing the NixOS package from nixpkgs-unstable, several commands (for example to create completions) throw errors which are written to the completions file, like

failed to create /homeless-shelter/.config/pangolin: mkdir /homeless-shelter: permission denied
failed to create /homeless-shelter/.config/pangolin/logs: mkdir /homeless-shelter: permission denied

A workaround can be to set the HOME environment variable in the Nix file.

But the problem also would not occur if pangolin-cli would not write the errors to stdout but to stderr.

Disclaimer: I'm quite new to NixOS but I checked back this matter with a very experienced colleague of mine. If you have any questions, please let me know.

Environment

• OS Type & Version: NixOS 25.11
• Pangolin Version: 1.18.4
• Gerbil Version:
• Traefik Version:
• Newt Version:
• Client Version: pangolin-cli 0.8.1

To Reproduce

• Set HOME environment variable to a directory without write permission for regular users (for example /root)
• Run pangolin completion fish >output.txt
• Check written file, error messages should be included.

Expected Behavior

Error messages should be sent to stderr.

[oschwartz10612]

@marcschaeferger do you want to take a look at this?

[marcschaeferger]

@oschwartz10612 Sure

[LaurenceJJones]

I dont mind also taking a look, imo most of our prerun and run commands via cobra should shift over to preRunE and runE so an error can be returned then cobra should handle stderr by default and error codes 👍🏻