## Summary
Look for a system level uv.toml config file under `/etc/uv/uv.toml` or
`C:\ProgramData`.
This PR is to address #6742 and start a conversation.
## Test Plan
This was tested locally manually on MacOS. I am happy to contribute
tests once we settle on the approach.
cc @thatch
---------
Co-authored-by: Charlie Marsh <charlie.r.marsh@gmail.com>
The docs reference `UV_INDEX_`, but the code actually uses
UV_HTTP_BASIC_ as the prefix for environment variable credentials.
See PR #7741
Code is at
https://github.com/astral-sh/uv/blob/main/crates/uv-static/src/env_vars.rs#L163
```rust
/// Generates the environment variable key for the HTTP Basic authentication username.
pub fn http_basic_username(name: &str) -> String {
format!("UV_HTTP_BASIC_{name}_USERNAME")
}
/// Generates the environment variable key for the HTTP Basic authentication password.
pub fn http_basic_password(name: &str) -> String {
format!("UV_HTTP_BASIC_{name}_PASSWORD")
}
```
---------
Co-authored-by: Charlie Marsh <charlie.r.marsh@gmail.com>
## Summary
This PR declares and documents all environment variables that are used
in one way or another in `uv`, either internally, or externally, or
transitively under a common struct.
I think over time as uv has grown there's been many environment
variables introduced. Its harder to know which ones exists, which ones
are missing, what they're used for, or where are they used across the
code. The docs only documents a handful of them, for others you'd have
to dive into the code and inspect across crates to know which crates
they're used on or where they're relevant.
This PR is a starting attempt to unify them, make it easier to discover
which ones we have, and maybe unlock future posibilities in automating
generating documentation for them.
I think we can split out into multiple structs later to better organize,
but given the high influx of PR's and possibly new environment variables
introduced/re-used, it would be hard to try to organize them all now
into their proper namespaced struct while this is all happening given
merge conflicts and/or keeping up to date.
I don't think this has any impact on performance as they all should
still be inlined, although it may affect local build times on changes to
the environment vars as more crates would likely need a rebuild. Lastly,
some of them are declared but not used in the code, for example those in
`build.rs`. I left them declared because I still think it's useful to at
least have a reference.
Did I miss any? Are their initial docs cohesive?
Note, `uv-static` is a terrible name for a new crate, thoughts? Others
considered `uv-vars`, `uv-consts`.
## Test Plan
Existing tests
