Can't select LLM provider on Home Manager (Nix)

[danielgafni]

Summary

Hi!

I have Zed installed with Home Manager. It's installed via Nix, so the Zed package (including the configuration file) is located in an immutable filesystem at /nix/store. This prevents Zed from writing some internal files while configuring the LLM provider:

2025-02-15T00:58:53.696861909+02:00 [ERROR] Failed to write settings to file "/nix/store/1y8xzd5d62cir6766sw2rnh905sakxfx-zed-user-settings"

Caused by:
    Read-only file system (os error 30) at path "/nix/store/.tmpXiiuio"

Steps to trigger the problem:

1. Install Zed with Nix: nix-shell -p zed
2. Run zed and try to select an LLM provider
3. Check the error log

---

I suggest using an alternative location for storing this internal information. It could be /tmp, or $XDG_CACHE_HOME, or something else which you consider reasonable. Alternatively, provide configuration options to change this behavior.

Thanks!

Zed Version and System Specs

Zed: v0.172.0 (Zed Dev)
OS: Linux Wayland nixos 25.05
Memory: 31.3 GiB
Architecture: x86_64
GPU: NVIDIA GeForce RTX 2080 SUPER || NVIDIA || 550.142

[devzeth]

Look similar to #24537

[danielgafni]

Indeed