Error when disallowed settings are defined in uv.toml

crates/uv-settings/src/combine.rs

@@ -1,5 +1,6 @@
 use std::num::NonZeroUsize;
 use std::path::PathBuf;
+
 use url::Url;
 
 use uv_configuration::{
@@ -124,3 +125,9 @@ impl Combine for serde::de::IgnoredAny {
         self
     }
 }
+
+impl Combine for Option<serde::de::IgnoredAny> {
+    fn combine(self, _other: Self) -> Self {
+        self
+    }
+}

crates/uv-settings/src/lib.rs

@@ -47,6 +47,7 @@ impl FilesystemOptions {
         match read_file(&file) {
             Ok(options) => {
                 debug!("Found user configuration in: `{}`", file.display());
+                validate_uv_toml(&file, &options)?;
                 Ok(Some(Self(options)))
             }
             Err(Error::Io(err)) if err.kind() == std::io::ErrorKind::NotFound => Ok(None),
@@ -83,11 +84,11 @@ impl FilesystemOptions {
                 Ok(None) => {
                     // Continue traversing the directory tree.
                 }
-                Err(Error::PyprojectToml(file, err)) => {
+                Err(Error::PyprojectToml(path, err)) => {
                     // If we see an invalid `pyproject.toml`, warn but continue.
                     warn_user!(
                         "Failed to parse `{}` during settings discovery:\n{}",
-                        file.cyan(),
+                        path.user_display().cyan(),
                         textwrap::indent(&err.to_string(), "  ")
                     );
                 }
@@ -108,7 +109,7 @@ impl FilesystemOptions {
         match fs_err::read_to_string(&path) {
             Ok(content) => {
                 let options: Options = toml::from_str(&content)
-                    .map_err(|err| Error::UvToml(path.user_display().to_string(), err))?;
+                    .map_err(|err| Error::UvToml(path.clone(), Box::new(err)))?;
 
                 // If the directory also contains a `[tool.uv]` table in a `pyproject.toml` file,
                 // warn.
@@ -125,6 +126,8 @@ impl FilesystemOptions {
                 }
 
                 debug!("Found workspace configuration at `{}`", path.display());
+
+                validate_uv_toml(&path, &options)?;
                 return Ok(Some(Self(options)));
             }
             Err(err) if err.kind() == std::io::ErrorKind::NotFound => {}
@@ -137,7 +140,7 @@ impl FilesystemOptions {
             Ok(content) => {
                 // Parse, but skip any `pyproject.toml` that doesn't have a `[tool.uv]` section.
                 let pyproject: PyProjectToml = toml::from_str(&content)
-                    .map_err(|err| Error::PyprojectToml(path.user_display().to_string(), err))?;
+                    .map_err(|err| Error::PyprojectToml(path.clone(), Box::new(err)))?;
                 let Some(tool) = pyproject.tool else {
                     debug!(
                         "Skipping `pyproject.toml` in `{}` (no `[tool]` section)",
@@ -238,21 +241,50 @@ fn system_config_file() -> Option<PathBuf> {
 /// Load [`Options`] from a `uv.toml` file.
 fn read_file(path: &Path) -> Result<Options, Error> {
     let content = fs_err::read_to_string(path)?;
-    let options: Options = toml::from_str(&content)
-        .map_err(|err| Error::UvToml(path.user_display().to_string(), err))?;
+    let options: Options =
+        toml::from_str(&content).map_err(|err| Error::UvToml(path.to_path_buf(), Box::new(err)))?;
     Ok(options)
 }
 
+/// Validate that an [`Options`] schema is compatible with `uv.toml`.
+fn validate_uv_toml(path: &Path, options: &Options) -> Result<(), Error> {
+    // The `uv.toml` format is not allowed to include any of the following, which are
+    // permitted by the schema since they _can_ be included in `pyproject.toml` files
+    // (and we want to use `deny_unknown_fields`).
+    if options.workspace.is_some() {
+        return Err(Error::PyprojectOnlyField(path.to_path_buf(), "workspace"));
+    }
+    if options.sources.is_some() {
+        return Err(Error::PyprojectOnlyField(path.to_path_buf(), "sources"));
+    }
+    if options.dev_dependencies.is_some() {
+        return Err(Error::PyprojectOnlyField(
+            path.to_path_buf(),
+            "dev-dependencies",
+        ));
+    }
+    if options.managed.is_some() {
+        return Err(Error::PyprojectOnlyField(path.to_path_buf(), "managed"));
+    }
+    if options.package.is_some() {
+        return Err(Error::PyprojectOnlyField(path.to_path_buf(), "package"));
+    }
+    Ok(())
+}
+
 #[derive(thiserror::Error, Debug)]
 pub enum Error {
     #[error(transparent)]
     Io(#[from] std::io::Error),
 
-    #[error("Failed to parse: `{0}`")]
-    PyprojectToml(String, #[source] toml::de::Error),
+    #[error("Failed to parse: `{}`", _0.user_display())]
+    PyprojectToml(PathBuf, #[source] Box<toml::de::Error>),
+
+    #[error("Failed to parse: `{}`", _0.user_display())]
+    UvToml(PathBuf, #[source] Box<toml::de::Error>),
 
-    #[error("Failed to parse: `{0}`")]
-    UvToml(String, #[source] toml::de::Error),
+    #[error("Failed to parse: `{}`. The `{1}` field is not allowed in a `uv.toml` file. `{1}` is only applicable in the context of a project, and should be placed in a `pyproject.toml` file instead.", _0.user_display())]
+    PyprojectOnlyField(PathBuf, &'static str),
 }
 
 #[cfg(test)]

crates/uv-settings/src/settings.rs

@@ -86,7 +86,8 @@ pub struct Options {
     cache_keys: Option<Vec<CacheKey>>,
 
     // NOTE(charlie): These fields are shared with `ToolUv` in
-    // `crates/uv-workspace/src/pyproject.rs`, and the documentation lives on that struct.
+    // `crates/uv-workspace/src/pyproject.rs`. The documentation lives on that struct.
+    // They're respected in both `pyproject.toml` and `uv.toml` files.
     #[cfg_attr(feature = "schemars", schemars(skip))]
     pub override_dependencies: Option<Vec<Requirement<VerbatimParsedUrl>>>,
 
@@ -95,6 +96,24 @@ pub struct Options {
 
     #[cfg_attr(feature = "schemars", schemars(skip))]
     pub environments: Option<SupportedEnvironments>,
+
+    // NOTE(charlie): These fields should be kept in-sync with `ToolUv` in
+    // `crates/uv-workspace/src/pyproject.rs`. The documentation lives on that struct.
+    // They're only respected in `pyproject.toml` files, and should be rejected in `uv.toml` files.
+    #[cfg_attr(feature = "schemars", schemars(skip))]
+    pub workspace: Option<serde::de::IgnoredAny>,
+
+    #[cfg_attr(feature = "schemars", schemars(skip))]
+    pub sources: Option<serde::de::IgnoredAny>,
+
+    #[cfg_attr(feature = "schemars", schemars(skip))]
+    pub dev_dependencies: Option<serde::de::IgnoredAny>,
+
+    #[cfg_attr(feature = "schemars", schemars(skip))]
+    pub managed: Option<serde::de::IgnoredAny>,
+
+    #[cfg_attr(feature = "schemars", schemars(skip))]
+    pub r#package: Option<serde::de::IgnoredAny>,
 }
 
 impl Options {
@@ -1551,22 +1570,19 @@ pub struct OptionsWire {
     cache_keys: Option<Vec<CacheKey>>,
 
     // NOTE(charlie): These fields are shared with `ToolUv` in
-    // `crates/uv-workspace/src/pyproject.rs`, and the documentation lives on that struct.
+    // `crates/uv-workspace/src/pyproject.rs`. The documentation lives on that struct.
+    // They're respected in both `pyproject.toml` and `uv.toml` files.
     override_dependencies: Option<Vec<Requirement<VerbatimParsedUrl>>>,
     constraint_dependencies: Option<Vec<Requirement<VerbatimParsedUrl>>>,
     environments: Option<SupportedEnvironments>,
 
     // NOTE(charlie): These fields should be kept in-sync with `ToolUv` in
-    // `crates/uv-workspace/src/pyproject.rs`.
-    #[allow(dead_code)]
+    // `crates/uv-workspace/src/pyproject.rs`. The documentation lives on that struct.
+    // They're only respected in `pyproject.toml` files, and should be rejected in `uv.toml` files.
     workspace: Option<serde::de::IgnoredAny>,
-    #[allow(dead_code)]
     sources: Option<serde::de::IgnoredAny>,
-    #[allow(dead_code)]
     dev_dependencies: Option<serde::de::IgnoredAny>,
-    #[allow(dead_code)]
     managed: Option<serde::de::IgnoredAny>,
-    #[allow(dead_code)]
     r#package: Option<serde::de::IgnoredAny>,
 }
 
@@ -1616,11 +1632,11 @@ impl From<OptionsWire> for Options {
             environments,
             publish_url,
             trusted_publishing,
-            workspace: _,
-            sources: _,
-            dev_dependencies: _,
-            managed: _,
-            package: _,
+            workspace,
+            sources,
+            dev_dependencies,
+            managed,
+            package,
         } = value;
 
         Self {
@@ -1664,15 +1680,20 @@ impl From<OptionsWire> for Options {
                 no_binary,
                 no_binary_package,
             },
-            publish: PublishOptions {
-                publish_url,
-                trusted_publishing,
-            },
             pip,
             cache_keys,
             override_dependencies,
             constraint_dependencies,
             environments,
+            publish: PublishOptions {
+                publish_url,
+                trusted_publishing,
+            },
+            workspace,
+            sources,
+            dev_dependencies,
+            managed,
+            package,
         }
     }
 }

crates/uv-workspace/src/pyproject.rs

@@ -160,7 +160,7 @@ pub struct ToolUv {
     ///
     /// See [Dependencies](../concepts/dependencies.md) for more.
     #[option(
-        default = "\"[]\"",
+        default = "{}",
         value_type = "dict",
         example = r#"
             [tool.uv.sources]
@@ -199,7 +199,7 @@ pub struct ToolUv {
     /// given the lowest priority when resolving packages. Additionally, marking an index as default will disable the
     /// PyPI default index.
     #[option(
-        default = "\"[]\"",
+        default = "[]",
         value_type = "dict",
         example = r#"
             [[tool.uv.index]]
@@ -253,7 +253,7 @@ pub struct ToolUv {
         )
     )]
     #[option(
-        default = r#"[]"#,
+        default = "[]",
         value_type = "list[str]",
         example = r#"
             dev-dependencies = ["ruff==0.5.0"]
@@ -277,7 +277,7 @@ pub struct ToolUv {
         )
     )]
     #[option(
-        default = r#"[]"#,
+        default = "[]",
         value_type = "str | list[str]",
         example = r#"
             # Resolve for macOS, but not for Linux or Windows.
@@ -312,7 +312,7 @@ pub struct ToolUv {
         )
     )]
     #[option(
-        default = r#"[]"#,
+        default = "[]",
         value_type = "list[str]",
         example = r#"
             # Always install Werkzeug 2.3.0, regardless of whether transitive dependencies request
@@ -343,7 +343,7 @@ pub struct ToolUv {
         )
     )]
     #[option(
-        default = r#"[]"#,
+        default = "[]",
         value_type = "list[str]",
         example = r#"
             # Ensure that the grpcio version is always less than 1.65, if it's requested by a
@@ -424,7 +424,7 @@ pub struct ToolUvWorkspace {
     ///
     /// For more information on the glob syntax, refer to the [`glob` documentation](https://docs.rs/glob/latest/glob/struct.Pattern.html).
     #[option(
-        default = r#"[]"#,
+        default = "[]",
         value_type = "list[str]",
         example = r#"
             members = ["member1", "path/to/member2", "libs/*"]
@@ -438,7 +438,7 @@ pub struct ToolUvWorkspace {
     ///
     /// For more information on the glob syntax, refer to the [`glob` documentation](https://docs.rs/glob/latest/glob/struct.Pattern.html).
     #[option(
-        default = r#"[]"#,
+        default = "[]",
         value_type = "list[str]",
         example = r#"
             exclude = ["member1", "path/to/member2", "libs/*"]

crates/uv/tests/it/pip_install.rs

@@ -201,6 +201,28 @@ fn invalid_pyproject_toml_option_unknown_field() -> Result<()> {
     Ok(())
 }
 
+#[test]
+fn invalid_uv_toml_option_disallowed() -> Result<()> {
+    let context = TestContext::new("3.12");
+    let uv_toml = context.temp_dir.child("uv.toml");
+    uv_toml.write_str(indoc! {r"
+        managed = true
+    "})?;
+
+    uv_snapshot!(context.pip_install()
+        .arg("iniconfig"), @r###"
+    success: false
+    exit_code: 2
+    ----- stdout -----
+
+    ----- stderr -----
+    error: Failed to parse: `uv.toml`. The `managed` field is not allowed in a `uv.toml` file. `managed` is only applicable in the context of a project, and should be placed in a `pyproject.toml` file instead.
+    "###
+    );
+
+    Ok(())
+}
+
 /// For indirect, non-user controlled pyproject.toml, we don't enforce correctness.
 ///
 /// If we fail to extract the PEP 621 metadata, we fall back to treating it as a source

docs/reference/settings.md

@@ -103,7 +103,7 @@ If an index is marked as `default = true`, it will be moved to the end of the pr
 given the lowest priority when resolving packages. Additionally, marking an index as default will disable the
 PyPI default index.
 
-**Default value**: `"[]"`
+**Default value**: `[]`
 
 **Type**: `dict`
 
@@ -208,7 +208,7 @@ alternative registry.
 
 See [Dependencies](../concepts/dependencies.md) for more.
 
-**Default value**: `"[]"`
+**Default value**: `{}`
 
 **Type**: `dict`