System-wide read-only cargo config

[figsoda]

Problem

It would be nice to have the ability to have system-wide read-only config.toml, perhaps with a dedicated environment variable like CARGO_CONFIG. If I set CARGO_HOME to a read-only directory, cargo operations that try to write to the cache would fail and I also don't want to have my cargo cache read-only. It is possible by symlinking everything else in a read-only CARGO_HOME to something not read-only, but the directory is not stable yet, and it could break my config and would be a maintenance burden on my end.

Proposed Solution

Having an environment variable like CARGO_CONFIG or accepting system-wide defaults from e.g. $XDG_CONFIG_DIRS or /etc

Notes

No response

[epage]

It would be nice to have the ability to have system-wide read-only config.toml, perhaps with a dedicated environment variable like CARGO_CONFIG.

Could you explain why this would be nice to have?

[figsoda]

I am using nixos and would like to manage my cargo config with nix, there are alternatives such as home manager, but this is the most elegant way to do it imo.

[weihanglo]

FYI, there is an unstable feature config-include if you want to load a config outside the config probing chain.