Disable always-authenticate when running under Dependabot - #16773
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Distressing, but makes sense.
| // Dependabot intercepts HTTP requests and injects credentials, which means that we | ||
| // cannot eagerly enforce an `AuthPolicy` as we don't know whether credentials will be | ||
| // added outside of uv. | ||
| && !std::env::var(EnvVars::DEPENDABOT).is_ok_and(|value| value == "true")); |
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Should we avoid doing re-reading this in this hot path?
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Uh we could. I assumed it was very cheap. I guess we're validating that the value is utf-8 and allocating a string?
I'm a little wary of the indirection of moving it out, I'm not sure where I'd put it.
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Yeah, environment accesses are somewhat expensive in Rust, since Rust acquires a lock on the entire environment (at least on macOS/Linux) for individual variable accesses. That wouldn't matter much in a lot of workloads, but I can imagine we'd have environment read contention in our setting because of work-splitting across multiple tokio-managed threads.
(It's probably still not a ton, but a OnceCell or LazyLock would avoid it as a concern.)
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This MR contains the following updates: | Package | Update | Change | |---|---|---| | [astral-sh/uv](https://github.com/astral-sh/uv) | patch | `0.9.10` -> `0.9.11` | MR created with the help of [el-capitano/tools/renovate-bot](https://gitlab.com/el-capitano/tools/renovate-bot). **Proposed changes to behavior should be submitted there as MRs.** --- ### Release Notes <details> <summary>astral-sh/uv (astral-sh/uv)</summary> ### [`v0.9.11`](https://github.com/astral-sh/uv/blob/HEAD/CHANGELOG.md#0911) [Compare Source](astral-sh/uv@0.9.10...0.9.11) Released on 2025-11-20. ##### Python - Add CPython 3.15.0a2 See the [`python-build-standalone` release notes](https://github.com/astral-sh/python-build-standalone/releases/tag/20251120) for details. ##### Enhancements - Add SBOM support to `uv export` ([#​16523](astral-sh/uv#16523)) - Publish to `crates.io` ([#​16770](astral-sh/uv#16770)) ##### Preview features - Add `uv workspace list --paths` ([#​16776](astral-sh/uv#16776)) - Fix the preview warning on `uv workspace dir` ([#​16775](astral-sh/uv#16775)) ##### Bug fixes - Fix `uv init` author serialization via `toml_edit` inline tables ([#​16778](astral-sh/uv#16778)) - Fix status messages without TTY ([#​16785](astral-sh/uv#16785)) - Preserve end-of-line comment whitespace when editing `pyproject.toml` ([#​16734](astral-sh/uv#16734)) - Disable `always-authenticate` when running under Dependabot ([#​16773](astral-sh/uv#16773)) ##### Documentation - Document the new behavior for free-threaded python versions ([#​16781](astral-sh/uv#16781)) - Improve note about build system in publish guide ([#​16788](astral-sh/uv#16788)) - Move do not upload publish note out of the guide into concepts ([#​16789](astral-sh/uv#16789)) </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this MR and you won't be reminded about this update again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this MR, check this box --- This MR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS4xNzMuMSIsInVwZGF0ZWRJblZlciI6IjQxLjE3My4xIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJSZW5vdmF0ZSBCb3QiXX0=-->
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Dependabot appears to run a proxy which intercepts all requests and adds credentials — credentials are not provided via the CLI or environment variables and there's no way for a user to do so. This means that when
authenticate = "always"is used (or when the index URL is on a pyx domain), uv will fail even though Dependabot may intercept the request and add credentials.See https://github.com/dependabot/dependabot-core/#private-registry-credential-management