Restore symlinked Python source traversal

src/module_writer/mod.rs

@@ -137,6 +137,7 @@ pub fn write_python_part(
         .parents(false)
         .git_global(false)
         .git_exclude(false)
+        .follow_links(true)
         .build()
     {
         let absolute = match absolute {

src/source_distribution/pyproject.rs

@@ -72,7 +72,7 @@ pub(super) fn add_python_sources(
     }
 
     for package in python_packages {
-        for entry in ignore::Walk::new(package) {
+        for entry in ignore::WalkBuilder::new(package).follow_links(true).build() {
             let source = entry?.into_path();
             if is_compiled_artifact(&source) {
                 debug!("Ignoring {}", source.display());

tests/run/wheel.rs

@@ -1,4 +1,5 @@
 use crate::common::{handle_result, other};
+use std::path::Path;
 
 #[test]
 #[cfg(feature = "sbom")]
@@ -57,6 +58,62 @@ fn pyo3_mixed_py_subdir_include_wheel_files() {
     ))
 }
 
+#[test]
+#[cfg(unix)]
+fn pyo3_mixed_py_subdir_includes_symlinked_python_files() {
+    use std::os::unix::fs::symlink;
+
+    handle_result((|| {
+        let temp_dir = tempfile::tempdir()?;
+        let project_dir = temp_dir.path().join("pyo3-mixed-py-subdir");
+        other::copy_dir_recursive(Path::new("test-crates/pyo3-mixed-py-subdir"), &project_dir)?;
+
+        let external_sources = temp_dir.path().join("external-python");
+        fs_err::create_dir_all(external_sources.join("linked_dir"))?;
+        fs_err::write(external_sources.join("linked_file.py"), "VALUE = 1\n")?;
+        fs_err::write(
+            external_sources.join("linked_dir").join("nested.py"),
+            "VALUE = 2\n",
+        )?;
+
+        let package_dir = project_dir
+            .join("python")
+            .join("pyo3_mixed_py_subdir")
+            .join("python_module");
+        symlink(
+            external_sources.join("linked_file.py"),
+            package_dir.join("linked_file.py"),
+        )?;
+        symlink(
+            external_sources.join("linked_dir"),
+            package_dir.join("linked_dir"),
+        )?;
+
+        let mut expected = vec![
+            "assets/extra_data.txt",
+            "pyo3_mixed_py_subdir-2.1.3.dist-info/METADATA",
+            "pyo3_mixed_py_subdir-2.1.3.dist-info/RECORD",
+            "pyo3_mixed_py_subdir-2.1.3.dist-info/WHEEL",
+            "pyo3_mixed_py_subdir-2.1.3.dist-info/entry_points.txt",
+            "pyo3_mixed_py_subdir/__init__.py",
+            "pyo3_mixed_py_subdir/python_module/__init__.py",
+            "pyo3_mixed_py_subdir/python_module/double.py",
+            "pyo3_mixed_py_subdir/python_module/linked_dir/nested.py",
+            "pyo3_mixed_py_subdir/python_module/linked_file.py",
+        ];
+        #[cfg(feature = "sbom")]
+        expected
+            .push("pyo3_mixed_py_subdir-2.1.3.dist-info/sboms/pyo3-mixed-py-subdir.cyclonedx.json");
+
+        assert_eq!(
+            other::wheel_files(&project_dir, "wheel-files-pyo3-mixed-py-subdir-symlinks")?,
+            expected.into_iter().map(str::to_owned).collect()
+        );
+
+        Ok(())
+    })())
+}
+
 #[test]
 fn pyo3_wheel_record_has_normalized_paths() {
     handle_result(other::check_wheel_paths(