Use `fs_err` for paths in symlinking errors (#13303)

In #13302, there was an IO error without context. This error seems to be
caused by a symlink error. Switching as symlinking to `fs_err` ensures
these errors will carry context in the future.

clippy.toml

@@ -35,4 +35,7 @@ disallowed-methods = [
   "std::fs::soft_link",
   "std::fs::symlink_metadata",
   "std::fs::write",
+  "std::os::unix::fs::symlink",
+  "std::os::windows::fs::symlink_dir",
+  "std::os::windows::fs::symlink_file",
 ]

crates/uv-cache/src/lib.rs

@@ -653,13 +653,13 @@ impl Cache {
         let dst = dst.as_ref();
 
         // Attempt to create the symlink directly.
-        match std::os::unix::fs::symlink(&src, dst) {
+        match fs_err::os::unix::fs::symlink(&src, dst) {
             Ok(()) => Ok(()),
             Err(err) if err.kind() == io::ErrorKind::AlreadyExists => {
                 // Create a symlink, using a temporary file to ensure atomicity.
                 let temp_dir = tempfile::tempdir_in(dst.parent().unwrap())?;
                 let temp_file = temp_dir.path().join("link");
-                std::os::unix::fs::symlink(&src, &temp_file)?;
+                fs_err::os::unix::fs::symlink(&src, &temp_file)?;
 
                 // Move the symlink into the target location.
                 fs_err::rename(&temp_file, dst)?;

crates/uv-fs/src/lib.rs

@@ -121,13 +121,13 @@ pub fn replace_symlink(src: impl AsRef<Path>, dst: impl AsRef<Path>) -> std::io:
 #[cfg(unix)]
 pub fn replace_symlink(src: impl AsRef<Path>, dst: impl AsRef<Path>) -> std::io::Result<()> {
     // Attempt to create the symlink directly.
-    match std::os::unix::fs::symlink(src.as_ref(), dst.as_ref()) {
+    match fs_err::os::unix::fs::symlink(src.as_ref(), dst.as_ref()) {
         Ok(()) => Ok(()),
         Err(err) if err.kind() == std::io::ErrorKind::AlreadyExists => {
             // Create a symlink, using a temporary file to ensure atomicity.
             let temp_dir = tempfile::tempdir_in(dst.as_ref().parent().unwrap())?;
             let temp_file = temp_dir.path().join("link");
-            std::os::unix::fs::symlink(src, &temp_file)?;
+            fs_err::os::unix::fs::symlink(src, &temp_file)?;
 
             // Move the symlink into the target location.
             fs_err::rename(&temp_file, dst.as_ref())?;

crates/uv-install-wheel/src/linker.rs

@@ -493,14 +493,14 @@ fn synchronized_copy(from: &Path, to: &Path, locks: &Locks) -> std::io::Result<(
 
 #[cfg(unix)]
 fn create_symlink<P: AsRef<Path>, Q: AsRef<Path>>(original: P, link: Q) -> std::io::Result<()> {
-    std::os::unix::fs::symlink(original, link)
+    fs_err::os::unix::fs::symlink(original, link)
 }
 
 #[cfg(windows)]
 fn create_symlink<P: AsRef<Path>, Q: AsRef<Path>>(original: P, link: Q) -> std::io::Result<()> {
     if original.as_ref().is_dir() {
-        std::os::windows::fs::symlink_dir(original, link)
+        fs_err::os::windows::fs::symlink_dir(original, link)
     } else {
-        std::os::windows::fs::symlink_file(original, link)
+        fs_err::os::windows::fs::symlink_file(original, link)
     }
 }

crates/uv-python/src/downloads.rs

@@ -761,7 +761,7 @@ impl ManagedPythonDownload {
         // to that date do not.
         #[cfg(unix)]
         {
-            match std::os::unix::fs::symlink(
+            match fs_err::os::unix::fs::symlink(
                 format!("python{}.{}", self.key.major, self.key.minor),
                 extracted.join("bin").join("python"),
             ) {

crates/uv-virtualenv/src/virtualenv.rs

@@ -384,7 +384,7 @@ pub(crate) fn create(
         && interpreter.markers().os_name() == "posix"
         && interpreter.markers().sys_platform() != "darwin"
     {
-        match std::os::unix::fs::symlink("lib", location.join("lib64")) {
+        match fs_err::os::unix::fs::symlink("lib", location.join("lib64")) {
             Ok(()) => {}
             Err(err) if err.kind() == io::ErrorKind::AlreadyExists => {}
             Err(err) => {

crates/uv/tests/it/build.rs

@@ -1765,7 +1765,7 @@ fn build_with_symlink() -> Result<()> {
             requires = ["hatchling"]
             build-backend = "hatchling.build"
     "#})?;
-    std::os::unix::fs::symlink(
+    fs_err::os::unix::fs::symlink(
         context.temp_dir.child("pyproject.toml.real"),
         context.temp_dir.child("pyproject.toml"),
     )?;

crates/uv/tests/it/pip_install.rs

@@ -3723,7 +3723,7 @@ fn launcher_with_symlink() -> Result<()> {
     );
 
     #[cfg(windows)]
-    if let Err(error) = std::os::windows::fs::symlink_file(
+    if let Err(error) = fs_err::os::windows::fs::symlink_file(
         context.venv.join("Scripts\\simple_launcher.exe"),
         context.temp_dir.join("simple_launcher.exe"),
     ) {
@@ -3736,7 +3736,7 @@ fn launcher_with_symlink() -> Result<()> {
     }
 
     #[cfg(unix)]
-    std::os::unix::fs::symlink(
+    fs_err::os::unix::fs::symlink(
         context.venv.join("bin/simple_launcher"),
         context.temp_dir.join("simple_launcher"),
     )?;
@@ -8123,7 +8123,7 @@ fn install_relocatable() -> Result<()> {
     #[cfg(unix)]
     {
         let script_symlink_path = context.temp_dir.join("black");
-        std::os::unix::fs::symlink(script_path, script_symlink_path.clone())?;
+        fs_err::os::unix::fs::symlink(script_path, script_symlink_path.clone())?;
         Command::new(script_symlink_path.as_os_str())
             .assert()
             .success()

crates/uv/tests/it/python_find.rs

@@ -746,7 +746,8 @@ fn python_required_python_major_minor() {
 
     // Symlink it to `python3.11`.
     fs_err::create_dir_all(context.temp_dir.child("child")).unwrap();
-    std::os::unix::fs::symlink(path, context.temp_dir.child("child").join("python3.11")).unwrap();
+    fs_err::os::unix::fs::symlink(path, context.temp_dir.child("child").join("python3.11"))
+        .unwrap();
 
     // Find `python3.11`, which is `>=3.11.4`.
     uv_snapshot!(context.filters(), context.python_find().arg(">=3.11.4, <3.12").env(EnvVars::UV_TEST_PYTHON_PATH, context.temp_dir.child("child").path()), @r###"