astral-sh/uv · error · anyhow::Error

The file `{}` appears to be a `pyproject.toml`, `setup.py`,

Error message

The file `{}` appears to be a `pyproject.toml`, `setup.py`, or `setup.cfg` file, which must be in a directory

What it means

Error "The file `{}` appears to be a `pyproject.toml`, `setup.py`, or `setup.cfg` file, which must be in a directory" thrown in astral-sh/uv.

Source

Thrown at crates/uv-requirements/src/source_tree.rs:180

            project,
            extras,
        })
    }

    /// Resolve the [`RequiresDist`] metadata for a given source tree. Attempts to resolve the
    /// requirements without building the distribution, even if the project contains (e.g.) a
    /// dynamic version since, critically, we don't need to install the package itself; only its
    /// dependencies.
    async fn resolve_requires_dist(&self, source_tree: &SourceTree) -> Result<RequiresDist> {
        // Convert to a buildable source.
        let path = fs_err::canonicalize(source_tree.path()).with_context(|| {
            format!(
                "Failed to canonicalize path to source tree: {}",
                source_tree.path().user_display()
            )
        })?;
        let path = path.parent().ok_or_else(|| {
            anyhow::anyhow!(
                "The file `{}` appears to be a `pyproject.toml`, `setup.py`, or `setup.cfg` file, which must be in a directory",
                path.user_display()
            )
        })?;

        // If the path is a `pyproject.toml`, attempt to extract the requirements statically. The
        // distribution database will do this too, but we can be even more aggressive here since we
        // _only_ need the requirements. So, for example, even if the version is dynamic, we can
        // still extract the requirements without performing a build, unlike in the database where
        // we typically construct a "complete" metadata object.
        if let Some(pyproject_toml) = source_tree.pyproject_toml() {
            if let Some(metadata) = self.database.requires_dist(path, pyproject_toml).await? {
                return Ok(metadata);
            }
        }

        let Ok(url) = Url::from_directory_path(path).map(DisplaySafeUrl::from_url) else {
            return Err(anyhow::anyhow!("Failed to convert path to URL"));

View on GitHub (pinned to f1a42680ff)

When it happens

Trigger: Thrown at crates/uv-requirements/src/source_tree.rs:180 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of astral-sh/uv@f1a42680ff (2026-08-16). Data as JSON: /api/errors/47da0a95c2bb4052. Report an issue: GitHub.