Respect relative paths in `uv build` sources (#8237)

## Summary

Right now, `uv build` will fail if a package depends on a local source
in `build-system.requires`.

crates/uv-build-frontend/src/lib.rs

@@ -245,6 +245,7 @@ impl SourceBuild {
     pub async fn setup(
         source: &Path,
         subdirectory: Option<&Path>,
+        install_path: &Path,
         fallback_package_name: Option<&PackageName>,
         fallback_package_version: Option<&Version>,
         interpreter: &Interpreter,
@@ -273,6 +274,7 @@ impl SourceBuild {
         // Check if we have a PEP 517 build backend.
         let (pep517_backend, project) = Self::extract_pep517_backend(
             &source_tree,
+            install_path,
             fallback_package_name,
             locations,
             source_strategy,
@@ -368,6 +370,7 @@ impl SourceBuild {
             create_pep517_build_environment(
                 &runner,
                 &source_tree,
+                install_path,
                 &venv,
                 &pep517_backend,
                 build_context,
@@ -436,6 +439,7 @@ impl SourceBuild {
     /// Extract the PEP 517 backend from the `pyproject.toml` or `setup.py` file.
     async fn extract_pep517_backend(
         source_tree: &Path,
+        install_path: &Path,
         package_name: Option<&PackageName>,
         locations: &IndexLocations,
         source_strategy: SourceStrategy,
@@ -469,7 +473,7 @@ impl SourceBuild {
                                 };
                                 let requires_dist = RequiresDist::from_project_maybe_workspace(
                                     requires_dist,
-                                    source_tree,
+                                    install_path,
                                     locations,
                                     source_strategy,
                                     LowerBound::Allow,
@@ -803,6 +807,7 @@ fn escape_path_for_python(path: &Path) -> String {
 async fn create_pep517_build_environment(
     runner: &PythonRunner,
     source_tree: &Path,
+    install_path: &Path,
     venv: &PythonEnvironment,
     pep517_backend: &Pep517Backend,
     build_context: &impl BuildContext,
@@ -921,7 +926,7 @@ async fn create_pep517_build_environment(
                 };
                 let requires_dist = RequiresDist::from_project_maybe_workspace(
                     requires_dist,
-                    source_tree,
+                    install_path,
                     locations,
                     source_strategy,
                     LowerBound::Allow,

crates/uv-dispatch/src/lib.rs

@@ -318,6 +318,7 @@ impl<'a> BuildContext for BuildDispatch<'a> {
         &'data self,
         source: &'data Path,
         subdirectory: Option<&'data Path>,
+        install_path: &'data Path,
         version_id: Option<String>,
         dist: Option<&'data SourceDist>,
         sources: SourceStrategy,
@@ -352,6 +353,7 @@ impl<'a> BuildContext for BuildDispatch<'a> {
         let builder = SourceBuild::setup(
             source,
             subdirectory,
+            install_path,
             dist_name,
             dist_version,
             self.interpreter,

crates/uv-distribution/src/source/mod.rs

@@ -1712,6 +1712,7 @@ impl<'a, T: BuildContext> SourceDistributionBuilder<'a, T> {
             .setup_build(
                 source_root,
                 subdirectory,
+                source_root,
                 Some(source.to_string()),
                 source.as_dist(),
                 source_strategy,
@@ -1756,6 +1757,7 @@ impl<'a, T: BuildContext> SourceDistributionBuilder<'a, T> {
             .setup_build(
                 source_root,
                 subdirectory,
+                source_root,
                 Some(source.to_string()),
                 source.as_dist(),
                 source_strategy,

crates/uv-types/src/traits.rs

@@ -111,6 +111,7 @@ pub trait BuildContext {
         &'a self,
         source: &'a Path,
         subdirectory: Option<&'a Path>,
+        install_path: &'a Path,
         version_id: Option<String>,
         dist: Option<&'a SourceDist>,
         sources: SourceStrategy,

crates/uv/src/commands/build_frontend.rs

@@ -535,9 +535,9 @@ async fn build_package(
     };
 
     // Prepare some common arguments for the build.
+    let dist = None;
     let subdirectory = None;
     let version_id = source.path().file_name().and_then(|name| name.to_str());
-    let dist = None;
 
     let build_output = match printer {
         Printer::Default | Printer::NoProgress | Printer::Verbose => {
@@ -563,6 +563,7 @@ async fn build_package(
                 .setup_build(
                     source.path(),
                     subdirectory,
+                    source.path(),
                     version_id.map(ToString::to_string),
                     dist,
                     sources,
@@ -601,6 +602,7 @@ async fn build_package(
                 .setup_build(
                     &extracted,
                     subdirectory,
+                    source.path(),
                     version_id.map(ToString::to_string),
                     dist,
                     sources,
@@ -623,6 +625,7 @@ async fn build_package(
                 .setup_build(
                     source.path(),
                     subdirectory,
+                    source.path(),
                     version_id.map(ToString::to_string),
                     dist,
                     sources,
@@ -645,6 +648,7 @@ async fn build_package(
                 .setup_build(
                     source.path(),
                     subdirectory,
+                    source.path(),
                     version_id.map(ToString::to_string),
                     dist,
                     sources,
@@ -666,6 +670,7 @@ async fn build_package(
                 .setup_build(
                     source.path(),
                     subdirectory,
+                    source.path(),
                     version_id.map(ToString::to_string),
                     dist,
                     sources,
@@ -684,6 +689,7 @@ async fn build_package(
                 .setup_build(
                     source.path(),
                     subdirectory,
+                    source.path(),
                     version_id.map(ToString::to_string),
                     dist,
                     sources,
@@ -724,6 +730,7 @@ async fn build_package(
                 .setup_build(
                     &extracted,
                     subdirectory,
+                    source.path(),
                     version_id.map(ToString::to_string),
                     dist,
                     sources,

crates/uv/tests/it/build.rs

@@ -2,6 +2,7 @@ use crate::common::{uv_snapshot, TestContext};
 use anyhow::Result;
 use assert_fs::prelude::*;
 use fs_err::File;
+use indoc::indoc;
 use insta::assert_snapshot;
 use predicates::prelude::predicate;
 use zip::ZipArchive;
@@ -1766,6 +1767,159 @@ fn build_no_build_logs() -> Result<()> {
     Ok(())
 }
 
+#[test]
+fn tool_uv_sources() -> Result<()> {
+    let context = TestContext::new("3.12");
+    let filters = context
+        .filters()
+        .into_iter()
+        .chain([
+            (r"exit code: 1", "exit status: 1"),
+            (r"bdist\.[^/\\\s]+-[^/\\\s]+", "bdist.linux-x86_64"),
+            (r"\\\.", ""),
+        ])
+        .collect::<Vec<_>>();
+
+    let build = context.temp_dir.child("backend");
+    build.child("pyproject.toml").write_str(
+        r#"
+        [project]
+        name = "backend"
+        version = "0.1.0"
+        requires-python = ">=3.12"
+        dependencies = ["typing-extensions>=3.10"]
+
+        [build-system]
+        requires = ["setuptools>=42"]
+        build-backend = "setuptools.build_meta"
+        "#,
+    )?;
+
+    build
+        .child("src")
+        .child("backend")
+        .child("__init__.py")
+        .write_str(indoc! { r#"
+            def hello() -> str:
+                return "Hello, world!"
+        "#})?;
+    build.child("README.md").touch()?;
+
+    let project = context.temp_dir.child("project");
+
+    project.child("pyproject.toml").write_str(
+        r#"
+        [project]
+        name = "project"
+        version = "0.1.0"
+        requires-python = ">=3.12"
+        dependencies = ["iniconfig>1"]
+
+        [build-system]
+        requires = ["setuptools>=42", "backend==0.1.0"]
+        build-backend = "setuptools.build_meta"
+
+        [tool.uv.sources]
+        backend = { path = "../backend" }
+        "#,
+    )?;
+
+    project.child("setup.py").write_str(indoc! {r"
+        from setuptools import setup
+
+        from backend import hello
+
+        hello()
+
+        setup()
+        ",
+    })?;
+
+    uv_snapshot!(filters, context.build().current_dir(project.path()), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Building source distribution...
+    running egg_info
+    creating project.egg-info
+    writing project.egg-info/PKG-INFO
+    writing dependency_links to project.egg-info/dependency_links.txt
+    writing requirements to project.egg-info/requires.txt
+    writing top-level names to project.egg-info/top_level.txt
+    writing manifest file 'project.egg-info/SOURCES.txt'
+    reading manifest file 'project.egg-info/SOURCES.txt'
+    writing manifest file 'project.egg-info/SOURCES.txt'
+    running sdist
+    running egg_info
+    writing project.egg-info/PKG-INFO
+    writing dependency_links to project.egg-info/dependency_links.txt
+    writing requirements to project.egg-info/requires.txt
+    writing top-level names to project.egg-info/top_level.txt
+    reading manifest file 'project.egg-info/SOURCES.txt'
+    writing manifest file 'project.egg-info/SOURCES.txt'
+    warning: sdist: standard file not found: should have one of README, README.rst, README.txt, README.md
+
+    running check
+    creating project-0.1.0
+    creating project-0.1.0/project.egg-info
+    copying files to project-0.1.0...
+    copying pyproject.toml -> project-0.1.0
+    copying setup.py -> project-0.1.0
+    copying project.egg-info/PKG-INFO -> project-0.1.0/project.egg-info
+    copying project.egg-info/SOURCES.txt -> project-0.1.0/project.egg-info
+    copying project.egg-info/dependency_links.txt -> project-0.1.0/project.egg-info
+    copying project.egg-info/requires.txt -> project-0.1.0/project.egg-info
+    copying project.egg-info/top_level.txt -> project-0.1.0/project.egg-info
+    copying project.egg-info/SOURCES.txt -> project-0.1.0/project.egg-info
+    Writing project-0.1.0/setup.cfg
+    Creating tar archive
+    removing 'project-0.1.0' (and everything under it)
+    Building wheel from source distribution...
+    running egg_info
+    writing project.egg-info/PKG-INFO
+    writing dependency_links to project.egg-info/dependency_links.txt
+    writing requirements to project.egg-info/requires.txt
+    writing top-level names to project.egg-info/top_level.txt
+    reading manifest file 'project.egg-info/SOURCES.txt'
+    writing manifest file 'project.egg-info/SOURCES.txt'
+    running bdist_wheel
+    running build
+    installing to build/bdist.linux-x86_64/wheel
+    running install
+    running install_egg_info
+    running egg_info
+    writing project.egg-info/PKG-INFO
+    writing dependency_links to project.egg-info/dependency_links.txt
+    writing requirements to project.egg-info/requires.txt
+    writing top-level names to project.egg-info/top_level.txt
+    reading manifest file 'project.egg-info/SOURCES.txt'
+    writing manifest file 'project.egg-info/SOURCES.txt'
+    Copying project.egg-info to build/bdist.linux-x86_64/wheel/project-0.1.0-py3.12.egg-info
+    running install_scripts
+    creating build/bdist.linux-x86_64/wheel/project-0.1.0.dist-info/WHEEL
+    creating '[TEMP_DIR]/project/dist/[TMP]/wheel' to it
+    adding 'project-0.1.0.dist-info/METADATA'
+    adding 'project-0.1.0.dist-info/WHEEL'
+    adding 'project-0.1.0.dist-info/top_level.txt'
+    adding 'project-0.1.0.dist-info/RECORD'
+    removing build/bdist.linux-x86_64/wheel
+    Successfully built dist/project-0.1.0.tar.gz and dist/project-0.1.0-py3-none-any.whl
+    "###);
+
+    project
+        .child("dist")
+        .child("project-0.1.0.tar.gz")
+        .assert(predicate::path::is_file());
+    project
+        .child("dist")
+        .child("project-0.1.0-py3-none-any.whl")
+        .assert(predicate::path::is_file());
+
+    Ok(())
+}
+
 /// Check that we have a working git boundary for builds from source dist to wheel in `dist/`.
 #[test]
 fn git_boundary_in_dist_build() -> Result<()> {