Add support for config_settings in PEP 517 hooks

crates/uv-build/Cargo.toml

@@ -21,7 +21,7 @@ platform-host = { path = "../platform-host" }
 uv-extract = { path = "../uv-extract" }
 uv-fs = { path = "../uv-fs" }
 uv-interpreter = { path = "../uv-interpreter" }
-uv-traits = { path = "../uv-traits" }
+uv-traits = { path = "../uv-traits", features = ["serde"] }
 pypi-types = { path = "../pypi-types" }
 
 anyhow = { workspace = true }

crates/uv-build/src/lib.rs

@@ -29,7 +29,7 @@ use distribution_types::Resolution;
 use pep508_rs::Requirement;
 use uv_fs::Normalized;
 use uv_interpreter::{Interpreter, Virtualenv};
-use uv_traits::{BuildContext, BuildKind, SetupPyStrategy, SourceBuildTrait};
+use uv_traits::{BuildContext, BuildKind, ConfigSettings, SetupPyStrategy, SourceBuildTrait};
 
 /// e.g. `pygraphviz/graphviz_wrap.c:3020:10: fatal error: graphviz/cgraph.h: No such file or directory`
 static MISSING_HEADER_RE: Lazy<Regex> = Lazy::new(|| {
@@ -247,6 +247,7 @@ pub struct SourceBuildContext {
 pub struct SourceBuild {
     temp_dir: TempDir,
     source_tree: PathBuf,
+    config_settings: ConfigSettings,
     /// If performing a PEP 517 build, the backend to use.
     pep517_backend: Option<Pep517Backend>,
     /// The virtual environment in which to build the source distribution.
@@ -281,6 +282,7 @@ impl SourceBuild {
         source_build_context: SourceBuildContext,
         package_id: String,
         setup_py: SetupPyStrategy,
+        config_settings: ConfigSettings,
         build_kind: BuildKind,
     ) -> Result<SourceBuild, Error> {
         let temp_dir = tempdir_in(build_context.cache().root())?;
@@ -354,6 +356,7 @@ impl SourceBuild {
                 build_context,
                 &package_id,
                 build_kind,
+                &config_settings,
             )
             .await?;
         }
@@ -364,6 +367,7 @@ impl SourceBuild {
             pep517_backend,
             venv,
             build_kind,
+            config_settings,
             metadata_directory: None,
             package_id,
         })
@@ -492,10 +496,13 @@ impl SourceBuild {
 
             prepare_metadata_for_build_wheel = getattr(backend, "prepare_metadata_for_build_wheel", None)
             if prepare_metadata_for_build_wheel:
-                print(prepare_metadata_for_build_wheel("{}"))
+                print(prepare_metadata_for_build_wheel("{}", config_settings={}))
             else:
                 print()
-            "#, pep517_backend.backend_import(), escape_path_for_python(&metadata_directory)
+            "#,
+            pep517_backend.backend_import(),
+            escape_path_for_python(&metadata_directory),
+            self.config_settings.escape_for_python(),
         };
         let span = info_span!(
             "run_python_script",
@@ -619,8 +626,13 @@ impl SourceBuild {
         let escaped_wheel_dir = escape_path_for_python(wheel_dir);
         let script = formatdoc! {
             r#"{}
-            print(backend.build_{}("{}", metadata_directory={}))
-            "#, pep517_backend.backend_import(), self.build_kind, escaped_wheel_dir, metadata_directory
+            print(backend.build_{}("{}", metadata_directory={}, config_settings={}))
+            "#,
+            pep517_backend.backend_import(),
+            self.build_kind,
+            escaped_wheel_dir,
+            metadata_directory,
+            self.config_settings.escape_for_python()
         };
         let span = info_span!(
             "run_python_script",
@@ -682,6 +694,7 @@ async fn create_pep517_build_environment(
     build_context: &impl BuildContext,
     package_id: &str,
     build_kind: BuildKind,
+    config_settings: &ConfigSettings,
 ) -> Result<(), Error> {
     debug!(
         "Calling `{}.get_requires_for_build_{}()`",
@@ -694,11 +707,11 @@ async fn create_pep517_build_environment(
 
             get_requires_for_build = getattr(backend, "get_requires_for_build_{}", None)
             if get_requires_for_build:
-                requires = get_requires_for_build()
+                requires = get_requires_for_build(config_settings={})
             else:
                 requires = []
             print(json.dumps(requires))
-        "#, pep517_backend.backend_import(), build_kind
+        "#, pep517_backend.backend_import(), build_kind, config_settings.escape_for_python()
     };
     let span = info_span!(
         "run_python_script",

crates/uv-dev/src/build.rs

@@ -14,7 +14,7 @@ use uv_dispatch::BuildDispatch;
 use uv_installer::NoBinary;
 use uv_interpreter::Virtualenv;
 use uv_resolver::InMemoryIndex;
-use uv_traits::{BuildContext, BuildKind, InFlight, NoBuild, SetupPyStrategy};
+use uv_traits::{BuildContext, BuildKind, ConfigSettings, InFlight, NoBuild, SetupPyStrategy};
 
 #[derive(Parser)]
 pub(crate) struct BuildArgs {
@@ -61,6 +61,7 @@ pub(crate) async fn build(args: BuildArgs) -> Result<PathBuf> {
     let index = InMemoryIndex::default();
     let setup_py = SetupPyStrategy::default();
     let in_flight = InFlight::default();
+    let config_settings = ConfigSettings::default();
 
     let build_dispatch = BuildDispatch::new(
         &client,
@@ -72,6 +73,7 @@ pub(crate) async fn build(args: BuildArgs) -> Result<PathBuf> {
         &in_flight,
         venv.python_executable(),
         setup_py,
+        &config_settings,
         &NoBuild::None,
         &NoBinary::None,
     );
@@ -84,6 +86,7 @@ pub(crate) async fn build(args: BuildArgs) -> Result<PathBuf> {
         SourceBuildContext::default(),
         args.sdist.display().to_string(),
         setup_py,
+        config_settings.clone(),
         build_kind,
     )
     .await?;

crates/uv-dev/src/install_many.rs

@@ -25,7 +25,7 @@ use uv_installer::{Downloader, NoBinary};
 use uv_interpreter::Virtualenv;
 use uv_normalize::PackageName;
 use uv_resolver::{DistFinder, InMemoryIndex};
-use uv_traits::{BuildContext, InFlight, NoBuild, SetupPyStrategy};
+use uv_traits::{BuildContext, ConfigSettings, InFlight, NoBuild, SetupPyStrategy};
 
 #[derive(Parser)]
 pub(crate) struct InstallManyArgs {
@@ -65,12 +65,12 @@ pub(crate) async fn install_many(args: InstallManyArgs) -> Result<()> {
     let setup_py = SetupPyStrategy::default();
     let in_flight = InFlight::default();
     let tags = venv.interpreter().tags()?;
-
     let no_build = if args.no_build {
         NoBuild::All
     } else {
         NoBuild::None
     };
+    let config_settings = ConfigSettings::default();
 
     let build_dispatch = BuildDispatch::new(
         &client,
@@ -82,6 +82,7 @@ pub(crate) async fn install_many(args: InstallManyArgs) -> Result<()> {
         &in_flight,
         venv.python_executable(),
         setup_py,
+        &config_settings,
         &no_build,
         &NoBinary::None,
     );

crates/uv-dev/src/resolve_cli.rs

@@ -18,7 +18,7 @@ use uv_dispatch::BuildDispatch;
 use uv_installer::NoBinary;
 use uv_interpreter::Virtualenv;
 use uv_resolver::{InMemoryIndex, Manifest, Options, Resolver};
-use uv_traits::{InFlight, NoBuild, SetupPyStrategy};
+use uv_traits::{ConfigSettings, InFlight, NoBuild, SetupPyStrategy};
 
 #[derive(ValueEnum, Default, Clone)]
 pub(crate) enum ResolveCliFormat {
@@ -72,12 +72,12 @@ pub(crate) async fn resolve_cli(args: ResolveCliArgs) -> Result<()> {
     };
     let index = InMemoryIndex::default();
     let in_flight = InFlight::default();
-
     let no_build = if args.no_build {
         NoBuild::All
     } else {
         NoBuild::None
     };
+    let config_settings = ConfigSettings::default();
 
     let build_dispatch = BuildDispatch::new(
         &client,
@@ -89,6 +89,7 @@ pub(crate) async fn resolve_cli(args: ResolveCliArgs) -> Result<()> {
         &in_flight,
         venv.python_executable(),
         SetupPyStrategy::default(),
+        &config_settings,
         &no_build,
         &NoBinary::None,
     );

crates/uv-dev/src/resolve_many.rs

@@ -21,7 +21,7 @@ use uv_installer::NoBinary;
 use uv_interpreter::Virtualenv;
 use uv_normalize::PackageName;
 use uv_resolver::InMemoryIndex;
-use uv_traits::{BuildContext, InFlight, NoBuild, SetupPyStrategy};
+use uv_traits::{BuildContext, ConfigSettings, InFlight, NoBuild, SetupPyStrategy};
 
 #[derive(Parser)]
 pub(crate) struct ResolveManyArgs {
@@ -96,6 +96,7 @@ pub(crate) async fn resolve_many(args: ResolveManyArgs) -> Result<()> {
                 let index_locations = IndexLocations::default();
                 let setup_py = SetupPyStrategy::default();
                 let flat_index = FlatIndex::default();
+                let config_settings = ConfigSettings::default();
 
                 // Create a `BuildDispatch` for each requirement.
                 let build_dispatch = BuildDispatch::new(
@@ -108,6 +109,7 @@ pub(crate) async fn resolve_many(args: ResolveManyArgs) -> Result<()> {
                     &in_flight,
                     venv.python_executable(),
                     setup_py,
+                    &config_settings,
                     &no_build,
                     &NoBinary::None,
                 );

crates/uv-dispatch/src/lib.rs

@@ -18,7 +18,7 @@ use uv_client::{FlatIndex, RegistryClient};
 use uv_installer::{Downloader, Installer, NoBinary, Plan, Planner, Reinstall, SitePackages};
 use uv_interpreter::{Interpreter, Virtualenv};
 use uv_resolver::{InMemoryIndex, Manifest, Options, Resolver};
-use uv_traits::{BuildContext, BuildKind, InFlight, NoBuild, SetupPyStrategy};
+use uv_traits::{BuildContext, BuildKind, ConfigSettings, InFlight, NoBuild, SetupPyStrategy};
 
 /// The main implementation of [`BuildContext`], used by the CLI, see [`BuildContext`]
 /// documentation.
@@ -34,6 +34,7 @@ pub struct BuildDispatch<'a> {
     setup_py: SetupPyStrategy,
     no_build: &'a NoBuild,
     no_binary: &'a NoBinary,
+    config_settings: &'a ConfigSettings,
     source_build_context: SourceBuildContext,
     options: Options,
 }
@@ -50,6 +51,7 @@ impl<'a> BuildDispatch<'a> {
         in_flight: &'a InFlight,
         base_python: PathBuf,
         setup_py: SetupPyStrategy,
+        config_settings: &'a ConfigSettings,
         no_build: &'a NoBuild,
         no_binary: &'a NoBinary,
     ) -> Self {
@@ -63,6 +65,7 @@ impl<'a> BuildDispatch<'a> {
             in_flight,
             base_python,
             setup_py,
+            config_settings,
             no_build,
             no_binary,
             source_build_context: SourceBuildContext::default(),
@@ -279,6 +282,7 @@ impl<'a> BuildContext for BuildDispatch<'a> {
             self.source_build_context.clone(),
             package_id.to_string(),
             self.setup_py,
+            self.config_settings.clone(),
             build_kind,
         )
         .boxed()

crates/uv-traits/Cargo.toml

@@ -13,6 +13,7 @@ license = { workspace = true }
 workspace = true
 
 [dependencies]
+clap = { workspace = true, optional = true }
 distribution-types = { path = "../distribution-types" }
 once-map = { path = "../once-map" }
 pep508_rs = { path = "../pep508-rs" }
@@ -21,4 +22,10 @@ uv-interpreter = { path = "../uv-interpreter" }
 uv-normalize = { path = "../uv-normalize" }
 
 anyhow = { workspace = true }
+serde = { workspace = true, optional = true }
+serde_json = { workspace = true, optional = true }
 tokio = { workspace = true, features = ["sync"] }
+
+[features]
+default = []
+serde = ["dep:serde", "dep:serde_json"]