Closes https://github.com/astral-sh/uv/issues/16218
This occurs when using a mounted file system in Docker.
We're almost always removing a virtual environment to replace it, and
removing the parent directory isn't necessary for that.
Provide a good error message when the discovered workspace members
mismatch with the locked workspace members in `uv export --frozen`,
instead of panicking.
Fixes#16406
I had some qualms with https://github.com/astral-sh/uv/pull/16318
1. The snapshot was specific to uv's managed interpreter due to
inclusion of the externally-managed output. This will break downstream
distros. We either need to filter the message, or, as done here, install
a managed interpreter.
2. It had a custom filter for the interpreter path, which we shouldn't
need. If needed, we should fix that in the test context.
3. We already had an implicit hint to create a virtual environment. The
change in styling of the new hint hint following it is confusing. It's
also confusing to hint creating a virtual environment when `--system`
was used.
4. There were unresolved requested changes to the language for the
message / it didn't fit stylistic with our existing ones.
5. The message was also very confusing for a uv-managed interpreter,
which is both a "system" Python interpreter (in that it's global) and
the opposite of a "system" interpreter per UV_PYTHON_PREFERENCE.
Also problematic, but not addressed here, is that there are other
commands that display an externally-managed message, e.g., `uv pip
sync`, but #16318 was just limited to `pip install`. We should not just
implement this in one place — I'll open a tracking issue to consolidate
and reuse the logic.
Hello,
# Summary
This PR fixes the confusing error message when running `uv lock --check`
with an outdated lockfile.
Previously, the error message incorrectly stated that `--locked` was
provided, even when the user used `--check`.
Now, the error message correctly indicates which flag was used: either
`--check` or `--locked`.
This closes#14105.
# Test plan
- I updated the existing integration test (`check_outdated_lock` in
`lock.rs`) to verify the new error message includes the correct flag.
- I ran existing tests to ensure I have no introduced regressions for
other commands.
## Summary
I tried to fix minor typos in the project
---------
Co-authored-by: Samuel Rigaud <rigaud@gmail.com>
Co-authored-by: konstin <konstin@mailbox.org>
## Summary
Fixes the logic for escaping a double quoted string in PowerShell by not
escaping a backslash but escaping the Unicode double quote variants that
PowerShell treats the same as the ASCII double quotes.
<img width="685" height="99" alt="image"
src="https://github.com/user-attachments/assets/ac1368c2-d915-4e49-b67f-ac71ee0f7d46"
/>
## Test Plan
There does not seem to be any tests for this. I'm fairly new to rust but
happy to add some if someone can point me in the right direction.
---------
Co-authored-by: Aria Desires <aria.desires@gmail.com>
Hello,
# Summary
This PR makes the error message clearer when you try to install packages
into an externally managed Python environment with the `--system` flag.
Now, instead of just failing, the error explains that you're hitting
this because you explicitly used `--system`.
This closes#15639.
# Test plan
- I added a new integration test (`install_with_system_interpreter` in
`pip_install.rs`) that checks the error message includes the hint.
- I tried to run `uv pip install --system -r requirements.txt` to see
the actual error message in action, but had permission issues.
Fixes#16340
## Summary
Some package registries (PyTorch, corporate PyPI mirrors) return `403
Forbidden` when a package is not found, instead of `404 Not Found`. The
previous error message incorrectly suggested this was always an
authentication issue, causing confusion for users.
This PR updates the error hint to clarify that a 403 error could
indicate either missing authentication credentials OR that the package
doesn't exist on the index.
## Test Plan
- Updated existing snapshot test in `crates/uv/tests/it/edit.rs` to
reflect the new error message
- The change is purely a message improvement with no behavioral changes
## Changes
### Before
hint: An index URL (https://example.com/simple) could not be queried due
to a lack of valid authentication credentials (403 Forbidden).
### After
hint: An index URL (https://example.com/simple) returned a 403 Forbidden
error. This could indicate missing authentication credentials, or the
package may not exist on this index.
## Files Changed
- `crates/uv-resolver/src/pubgrub/report.rs` - Updated error message
- `crates/uv/tests/it/edit.rs` - Updated snapshot test expectation
---------
Co-authored-by: eun2ce <eun2ce@eun2ceui-MacBookPro.local>
Co-authored-by: konstin <konstin@mailbox.org>
## Summary
fixes issue #15938
- show platform wheel hint with a concrete
`tool.uv.required-environments` example so users know how to configure
compatibility
- add `WheelTagHint::suggest_environment_marker` to pick a sensible
environment marker based on the available wheel tags
- update the `sync_required_environment_hint` integration snapshot to
expect the new multi-line hint
## Test Plan
cargo test --package uv --test it --
sync::sync_required_environment_hint
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## Summary
<!-- What's the purpose of the change? What does it do, and why? -->
The warning shown when `egg-info` lacks `top_level.txt` incorrectly
warns about missing `top-level.txt`
ee2649feaa/crates/uv-install-wheel/src/uninstall.rs (L179-L188)ee2649feaa/crates/uv/src/commands/pip/operations.rs (L687-L693)
The non fatal warning with incorrect filename was introduced in
https://github.com/astral-sh/uv/pull/6881 which changed previous fatal
error https://github.com/astral-sh/uv/issues/6872 with correct
`top_level.txt` output.
## Test Plan
<!-- How was it tested? -->
Updated unit test to reflect change in warning
This PR enables `--torch-backend=auto` to automatically detect Intel
GPUs. It follows up on
[#14386](https://github.com/astral-sh/uv/pull/14386).
On Windows, detection is implemented by querying the
`Win32_VideoController` class via the [WMI
crate](https://github.com/ohadravid/wmi-rs/tree/v0.16.0).
Currently, Intel GPUs (XPU) do not depend on specific driver or toolkit
versions to determine which PyTorch wheel to use.
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## Summary
HTTP1.1 [RFC 9112 -
HTTP/1.1](https://www.rfc-editor.org/rfc/rfc9112.html#name-status-line)
section 4 defines the response status code to optionally include a text
description (human readable) of the reason for the status code.
[RFC9113 - HTTP/2](https://www.rfc-editor.org/rfc/rfc9113) is the HTTP2
protocol standard and the response status only considers the [status
code](https://www.rfc-editor.org/rfc/rfc9113#name-response-pseudo-header-fiel)
and not the reason phrase, and as such important information can be lost
in helping the client determine a route cause of a failure.
As per discussion on this
[PR](https://github.com/astral-sh/uv/pull/15979) the current feeling is
that implementing the RFC9457 standard might be the preferred route.
This PR makes those changes to aid the discussion which has also been
moved to the [PEP
board](https://discuss.python.org/t/block-download-of-components-when-violating-policy/104021/1)
## Test Plan
Pulling components that violate our policy over HTTP2 and without any
RFC9457 implementation the following message is presented to the user:
<img width="1482" height="104" alt="image"
src="https://github.com/user-attachments/assets/0afcd0d8-ca67-4f94-a6c2-131e3b6d8dcc"
/>
With the RFC9457 standard implemented, below you can see the advantage
in the extra context as to why the component has been blocked:
<img width="2171" height="127" alt="image"
src="https://github.com/user-attachments/assets/25bb5465-955d-4a76-9f30-5477fc2c866f"
/>
---------
Co-authored-by: konstin <konstin@mailbox.org>
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## Summary
Fixes#16285
## Test Plan
<!-- How was it tested? -->
Sometimes a credential's `Debug` formatted value appears in tracing logs
- make sure the credential doesn't appear there.
## Test plan
Added a test case + ran
```
uv pip install --default-index $PYX_API_URL/$SOME_INDEX $SOME_PACKAGE -vv
```
With an authenticated uv client and confirmed the tokens are obfuscated.
---------
Co-authored-by: Zsolt Dollenstein <zsol.zsol@gmail.com>
## Summary
- Move parsing `UV_CONCURRENT_INSTALLS`, `UV_CONCURRENT_BUILDS` and
`UV_CONCURRENT_DOWNLOADS` to `EnvironmentOptions`
Relates https://github.com/astral-sh/uv/issues/14720
## Test Plan
- Tests with existing tests
- Add test with invalid parsing
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Closes#15312
Closes https://github.com/astral-sh/uv/issues/16237
---------
Co-authored-by: pythonweb2 <32141163+pythonweb2@users.noreply.github.com>
Co-authored-by: Wade Roberts <wade.roberts@centralsquare.com>
## Summary
Adds the version for environment variables added in
https://github.com/astral-sh/uv/pull/16040 and
https://github.com/astral-sh/uv/pull/16125. as these were in-flight
before documentation versioning was added.
Adds ability to emit a compiler error when added in is missing for
improved reporting to the developer.
e.g. example for the ones fixed in this PR
```shell
error: missing #[attr_added_in("x.y.z")] on `UV_UPLOAD_HTTP_TIMEOUT`
note: env vars for an upcoming release should be annotated with `#[attr_added_in("next release")]`
--> crates\uv-static\src\env_vars.rs:593:15
|
593 | pub const UV_UPLOAD_HTTP_TIMEOUT: &'static str = "UV_UPLOAD_HTTP_TIMEOUT";
| ^^^^^^^^^^^^^^^^^^^^^^
error: missing #[attr_added_in("x.y.z")] on `UV_WORKING_DIRECTORY`
note: env vars for an upcoming release should be annotated with `#[attr_added_in("next release")]`
--> crates\uv-static\src\env_vars.rs:1087:15
|
1087 | pub const UV_WORKING_DIRECTORY: &'static str = "UV_WORKING_DIRECTORY";
| ^^^^^^^^^^^^^^^^^^^^
error: could not compile `uv-static` (lib) due to 2 previous errors
```
Cargo is currently recompiling uv-python on every invocation because the
minified JSON output file is getting a mod time newer than the last run.
Instead, set the mod time of the output file to the same as the input
file.
## Summary
When specifying constraints or overrides in combination with
`pylock.toml` as an input to `uv pip install`,
the error messages are not currently correct.
## Test Plan
No testing, it's a straightforward error string fix.
---------
Co-authored-by: Zanie Blue <contact@zanie.dev>
## Summary
- Move parsing `UV_HTTP_TIMEOUT`, `UV_REQUEST_TIMEOUT` and
`HTTP_TIMEOUT` to `EnvironmentOptions`
- Add new env varialbe `UV_UPLOAD_HTTP_TIMEOUT`
Relates https://github.com/astral-sh/uv/issues/14720
## Test Plan
Tests with existing tests
I think this is ostensively breaking, though I think the impact would be
small given this will go out in 0.9.1 and should only affect people
using pre-release Python versions.
When `3.14.0` is requested (opposed to `3.14`), we treat this as a
request for a final / stable version and ignore pre-releases.
I think this is a fairly clean way to allow users to explicitly request
the stable version.
Closes https://github.com/astral-sh/uv/issues/16175
Follows #16208
## Summary
Fixes [1633](https://github.com/astral-sh/uv/issues/16133). Preserves
comments preceding "version = ..." line when uv version --bump is ran
## Test Plan
Added IT test
---------
Co-authored-by: konsti <konstin@mailbox.org>
Example output:
```
$ uv-debug init foo -v
DEBUG uv 0.9.0+6 (d3324baf68 2025-10-08)
DEBUG Acquired shared lock for `/home/konsti/.cache/uv`
DEBUG No Python version file found in ancestors of working directory: /home/konsti/projects/foo
DEBUG Checking for Python environment at: `foo/.venv`
DEBUG Searching for default Python interpreter in managed installations or search path
DEBUG Searching for managed installations at `/home/konsti/.local/share/uv/python`
DEBUG Found managed installation `cpython-3.14.0-linux-x86_64-gnu`
DEBUG Found `cpython-3.14.0-linux-x86_64-gnu` at `/home/konsti/.local/share/uv/python/cpython-3.14.0-linux-x86_64-gnu/bin/python3.14` (managed installations)
DEBUG Using Python version `>=3.14` from default interpreter
DEBUG `git rev-parse --is-inside-work-tree` failed but didn't contain `not a git repository` in stderr for `/home/konsti/projects/foo`
DEBUG No Python version file found in ancestors of working directory: /home/konsti/projects/foo
DEBUG Writing Python versions to `/home/konsti/projects/foo/.python-version`
Initialized project `foo` at `/home/konsti/projects/foo`
DEBUG Released lock at `/home/konsti/.cache/uv/.lock`
```
First commit is refactoring, second commit is the actual change.
The h2 errors, a specific type nested in reqwest errors, all look like
they shouldn't happen in regular operations and should be retried. This
covers all `io::Error`s going through h2 (i.e., only HTTP 2
connections).
Fixes https://github.com/astral-sh/uv/issues/15916
## Summary
As new environment variables get introduced (e.g. `UV_EDITABLE`) I
thought it would useful to start tracking which release they were
introduced. I think its a common workflow to navigate to the [env var
documentation](https://docs.astral.sh/uv/reference/environment) to know
what the env var for something is but then end up in a situation where
one is using an environment variable with the wrong version of uv and
not notice immediately that its not compatible and therefore ignored.
## Test Plan
Existing tests.
The versions in `since` have all been manually reviewed to the best of
my ability for correctness.
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## Summary
<!-- What's the purpose of the change? What does it do, and why? -->
This pull request enables the `--directory` option to accept environment
variable: `UV_DIRECTORY`
### Motivation
Currently, the `--project` option already supports environment
variables, but --directory does not.
The motivation for this change is the same as for the --project option.
When using this option, it’s likely that the project root and the
directory containing the uv project differ. In such cases, allowing
environment variables makes it easier to avoid repeatedly specifying the
directory in commands or task runners.
### Other PRs
- PR for create `--project` option:
https://github.com/astral-sh/uv/pull/12327
## Test Plan
<!-- How was it tested? -->
### no auto testing
As with the --project option, no auto tests are included for this
change.
This is because the implementation relies on Clap’s built-in attribute
functionality, and testing such behavior would effectively mean testing
a third-party crate, which would be redundant.
As long as the compiler accepts it, things should work as expected.
### testing manually
i tested manually like [previous pull
request](https://github.com/astral-sh/uv/pull/12327)
```shell
$ cargo build --locked
./target/debug/uv init uv_directory
$ mkdir uv_directory
$ UV_DIRECTORY=uv_directory ./target/debug/uv sync
Using CPython 3.14.0rc3
Creating virtual environment at: .venv
Resolved 1 package in 15ms
Audited in 0.04ms
$ UV_DIRECTORY=uv_directory ./target/debug/uv run main.py
Hello from uv-directory!
$ ./target/debug/uv run main.py
error: Failed to spawn: `main.py`
Caused by: No such file or directory (os error 2)
```
---------
Co-authored-by: Zanie Blue <contact@zanie.dev>
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Hey devs, great tool as always, you're doing amazing work.
## Summary
<!-- What's the purpose of the change? What does it do, and why? -->
Adds the following fields to the `[package]` table of `Cargo.toml` files
where they were missing:
```toml
rust-version = { workspace = true }
homepage = { workspace = true }
documentation = { workspace = true }
repository = { workspace = true }
authors = { workspace = true }
license = { workspace = true }
```
Most crates already had these fields, this just aligns the rest for
consistency.
This also resolves the warnings from `cargo-deny` when using `uv` crates
as dependencies in Pixi.
## Test Plan
No tests needed, this only updates metadata.
Pick up python-build-standalone tag 20251007 to add 3.14.0 final
and 3.13.8, and adjust tests.
Also, fix matching version requests with prereleases: `uvx
python@3.14.0rc3` should not be satisfied by 3.14.0 final.
Co-authored-by: Geoffrey Thomas <geofft@ldpreload.com>
The `uv-python` crate reads the checked-in download metadata to write
out a minified version to be statically included into the binary.
Sometimes, the resulting `download-metadata-minified.json` can go
missing, such as when `uv` is installed via `cargo` as a git source, and
there is an update; `cargo` will do a hard reset on the git repo it
stores in the cache, causing it to be deleted. In these instances, the
`uv-python` crate does not currently re-run its build script, because as
it happens, there was no change to the `download-metadata.json` since it
was last compiled. This causes a build error like:
```
Updating git repository `https://github.com/astral-sh/uv`
Installing uv v0.8.24 (https://github.com/astral-sh/uv?tag=0.8.24#252f8873)
Updating crates.io index
Compiling uv-version v0.8.24 (/home/skhawtho/.cargo/git/checkouts/uv-c9e40703e19509a8/252f887/crates/uv-version)
Compiling uv-git v0.0.1 (/home/skhawtho/.cargo/git/checkouts/uv-c9e40703e19509a8/252f887/crates/uv-git)
Compiling uv-build-backend v0.1.0 (/home/skhawtho/.cargo/git/checkouts/uv-c9e40703e19509a8/252f887/crates/uv-build-backend)
Compiling uv-configuration v0.0.1 (/home/skhawtho/.cargo/git/checkouts/uv-c9e40703e19509a8/252f887/crates/uv-configuration)
Compiling uv-client v0.0.1 (/home/skhawtho/.cargo/git/checkouts/uv-c9e40703e19509a8/252f887/crates/uv-client)
Compiling uv-extract v0.0.1 (/home/skhawtho/.cargo/git/checkouts/uv-c9e40703e19509a8/252f887/crates/uv-extract)
Compiling uv-workspace v0.0.1 (/home/skhawtho/.cargo/git/checkouts/uv-c9e40703e19509a8/252f887/crates/uv-workspace)
Compiling uv-python v0.0.1 (/home/skhawtho/.cargo/git/checkouts/uv-c9e40703e19509a8/252f887/crates/uv-python)
Compiling uv-requirements-txt v0.0.1 (/home/skhawtho/.cargo/git/checkouts/uv-c9e40703e19509a8/252f887/crates/uv-requirements-txt)
Compiling uv-bin-install v0.0.1 (/home/skhawtho/.cargo/git/checkouts/uv-c9e40703e19509a8/252f887/crates/uv-bin-install)
Compiling uv-publish v0.1.0 (/home/skhawtho/.cargo/git/checkouts/uv-c9e40703e19509a8/252f887/crates/uv-publish)
error: couldn't read `crates/uv-python/src/download-metadata-minified.json`: No such file or directory (os error 2)
--> crates/uv-python/src/downloads.rs:795:45
|
795 | const BUILTIN_PYTHON_DOWNLOADS_JSON: &str = include_str!("download-metadata-minified.json");
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: could not compile `uv-python` (lib) due to 1 previous error
error: failed to compile `uv v0.8.24 (https://github.com/astral-sh/uv?tag=0.8.24#252f8873)`, intermediate artifacts can be found at `/home/skhawtho/.cache/cargo`.
To reuse those artifacts with a future compilation, set the environment variable `CARGO_TARGET_DIR` to that path.
```
This fixes the issue by also adding a `rerun-if-changed` on the
resulting minified JSON file.
Separately, this revision also changes the output directory of the
minified file to the build script's output directory via the `OUT_DIR`
environment variable, so as not to pollute the source code.
Resolves https://github.com/astral-sh/uv/issues/15665
`uv tool upgrade` already respects version pins, but when a tool was
installed with an exact version the command quietly becomes a no-op even
though users expect it to upgrade the executable. This change tweaks the
upgrade flow to detect that situation by inspecting the stored receipt
and, whenever the tool stays pinned, emit a concise hint explaining why
the version didn’t move and how to reinstall without the pin.
The message still appears if the run only refreshed supporting packages,
so users aren’t misled by dependency churn that leaves the tool itself
untouched.
I also added an integration test for the scenario end to end by
installing `babel==2.6.0`, attempting an upgrade, and asserting that the
hint is shown alongside the dependency updates.
Closes https://github.com/astral-sh/uv/issues/16112
```
❯ cargo run -q cache clean
Cache is currently in-use, waiting for other uv processes to finish (use `--force` to override)
```
Otherwise, `-v` is required to see we're waiting on a lock.
I'd rather do this than elevate the exclusive lock log message to
something more verbose because this allows us to use a more specific
message as appropriate for the situation. We also previously reduced the
verbosity of arbitrary locks, e.g., see
https://github.com/astral-sh/uv/issues/7489
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## Summary
<!-- What's the purpose of the change? What does it do, and why? -->
Fixes a part of #14720
Add `TRACING_DURATIONS_FILE` to EnvironmentOptions.
## Test Plan
<!-- How was it tested? -->
## Summary
We serialize the index to the lockfile without the username, so if we
compare based on `==` and the user _includes_ the username in their
`pyproject.toml`, the check will always fail.
Closes https://github.com/astral-sh/uv/issues/16076.
Resolves https://github.com/astral-sh/uv/issues/16067
When we build the dependency graph we add an edge per `Requires-Dist`.
If a package publishes multiple marker-guarded requirements (like
pylint’s `dill>=…` for different Python versions), more than one marker
can evaluate to true at runtime, which gives us several edges pointing
to the same installed package node.
To avoid printing the package multiple times, we gather all edges
targeting that node, pass them through a `Cursor`, and aggregate their
requirement details before we print the dependency line. That
aggregation does two things:
1. If any edge carries a URL, we return that URL immediately.
2. Otherwise we merge all version specifiers into one canonical PEP 440
string.
I've added an integration test, namely `cargo test -p uv --test it
--features pypi -- no_duplicate_dependencies_with_markers` exercises the
new snapshot that installs pylint (with the real dill duplication
scenario present in the original issue) and asserts the tree output,
both with and without `--show-version-specifiers`, now shows a single
dill entry with the merged constraint.
## Summary
I don't think it's common for this to matter, but in theory at least
it's important that these are ordered by severity. Otherwise, e.g,
changing the pre-release mode (and then returning early) could mean we
retain the forks when we otherwise shouldn't.
## Summary
This argument has always existed for compatibility, but apparently we
don't respect it. I assume it was unintentionally dropped during a
refactor.
Closes https://github.com/astral-sh/uv/issues/15950.
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This PR contains the following updates:
| Package | Type | Update | Change |
|---|---|---|---|
| [anyhow](https://redirect.github.com/dtolnay/anyhow) |
workspace.dependencies | patch | `1.0.99` -> `1.0.100` |
---
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[Compare
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- Teach clippy to lint formatting arguments in `bail!`, `ensure!`,
`anyhow!`
([#​426](https://redirect.github.com/dtolnay/anyhow/issues/426))
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log](https://developer.mend.io/github/astral-sh/uv).
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---------
Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: konstin <konstin@mailbox.org>
## Summary
If you provide `--refresh` to `uv lock`, we'll now always resolve (even
though it might return the same result). This is also robust to
`--locked` such that `--refresh --locked` will only fail if the lockfile
changes.
Closes https://github.com/astral-sh/uv/issues/15997.
## Summary
This PR enables users to mark a URL as an S3 endpoint, at which point uv
will sign requests to that URL by detecting credentials from the
standard AWS environment variables, configuration files, etc.
Signing is handled by the
[reqsign](https://docs.rs/reqsign/latest/reqsign/) crate, which we can
also use in the future to sign requests for other providers.
We're seeing reports of a regression from
https://github.com/astral-sh/uv/pull/15888 where `--no-cache` causes `uv
run` and `uvx` to fail to spawn a command.
The intent of this code was to allow destructive cache operations
_after_ we'd finished setting up the environment. However, it's unclear
to me that it's safe to run `uv cache clean` during a `uv run` operation
(e.g., `uv run --script` uses an environment in the cache) and, more
importantly, we cannot drop non-persistent caches (e.g., from
`--no-cache`) as they include the environment we're spawning the command
in.
Alternative to #15977 which retains release of the lock — we may want to
consider that approach still but this regression needs to be resolved
quickly.
Closes https://github.com/astral-sh/uv/issues/15989
Closes https://github.com/astral-sh/uv/issues/15987
Closes https://github.com/astral-sh/uv/issues/15967
Turns out if the minor versions matched we returned false from
`is_upgrade_of` instead of continuing to compare prerelease versions.
Closes#15955.
Note: test cases were initially generated by Claude - I tried making
them shorter.
## Test plan
```
❯ cargo run -- -v python upgrade 3.14
[...]
DEBUG Inspecting existing executable at `/Users/zsol/.local/bin/python3.14`
DEBUG Replacing existing executable for `cpython-3.14.0rc2-macos-aarch64-none` at `/Users/zsol/.local/bin/python3.14` with executable for `cpython-3.14.0rc3-macos-aarch64-none` since it is an upgrade
DEBUG Updated executable at `/Users/zsol/.local/bin/python3.14` to cpython-3.14.0rc3-macos-aarch64-none
Installed Python 3.14.0rc3 in 5.04s
+ cpython-3.14.0rc3-macos-aarch64-none (python3.14)
[...]
❯ uvx python3.14 -V
Python 3.14.0rc3
```
Add an incompatibility that lets pubgrub skip of marker packages when
the base package already has an incompatible version to improve the
error messages (https://github.com/astral-sh/uv/issues/15199).
The change is also a small perf improvement. Overall this should be able
to improve performance in slow cases by avoiding trying proxy package
versions that are impossible anyway, for a (ideally very small cost) for
tracking the additional incompatibility and tracking the base package
for each proxy package.
```
$ hhyperfine --warmup 2 "uv pip compile --universal scripts/requirements/airflow.in" "target/release/uv pip compile --universal scripts/requirements/airflow.in"
Benchmark 1: uv pip compile --universal scripts/requirements/airflow.in
Time (mean ± σ): 145.5 ms ± 3.9 ms [User: 154.7 ms, System: 140.7 ms]
Range (min … max): 139.2 ms … 153.4 ms 20 runs
Benchmark 2: target/release/uv pip compile --universal scripts/requirements/airflow.in
Time (mean ± σ): 128.7 ms ± 5.5 ms [User: 141.9 ms, System: 137.3 ms]
Range (min … max): 121.8 ms … 142.0 ms 23 runs
Summary
target/release/uv pip compile --universal scripts/requirements/airflow.in ran
1.13 ± 0.06 times faster than uv pip compile --universal scripts/requirements/airflow.in
```
This implementation is the basic version: When we see a proxy
`foo{...}>=x,<y` we add a dependency edge `foo{...}>=x,<y` ->
`foo>=x,<y`. There are several way to extend this, which likely help
more with performance than with error messages.
One idea is that if we see `foo{...}>=x,<y` but we already made a
selection for `foo==z` outside that range, we can insert a dependency
`foo{...}!=z` -> `foo!=z`. This avoids trying any version of the proxy
package except the version that matches our previous selection.
Another is that if we see a dependency `foo>=x,<y`, we also add
`foo{...}>=x,y` -> `foo>=x,<y`. This allows backtracking beyond `foo`
immediately if all version of `foo{...}>=x,<y` are incompatible, since
`foo{...}>=x,<y` incompatible -> `foo>=x,<y` incompatible -> the package
that depended of `foo>=x,<y` is incompatible.
The cost for each of these operations is tracking an additional
incompatibility per virtual package. An alternative approach is to only
add the incompatibility lazily, only when we've tried several version of
the virtual package already. This needs to be weighed of with the better
error messages that the incompatibility gives, we unfortunately have
only few large reference examples.
Requires https://github.com/astral-sh/pubgrub/pull/45
Closes https://github.com/astral-sh/uv/issues/15199
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