uucore: add function which checks hardlink as well as directed symlink

src/uucore/src/lib/features/fs.rs

@@ -648,6 +648,36 @@ pub fn are_hardlinks_to_same_file(source: &Path, target: &Path) -> bool {
     source_metadata.ino() == target_metadata.ino() && source_metadata.dev() == target_metadata.dev()
 }
 
+#[cfg(not(unix))]
+pub fn are_hardlinks_or_one_way_symlink_to_same_file(_source: &Path, _target: &Path) -> bool {
+    false
+}
+
+/// Checks if either two paths are hard links to the same file or if the source path is a symbolic link which when fully resolved points to target path
+///
+/// # Arguments
+///
+/// * `source` - A reference to a `Path` representing the source path.
+/// * `target` - A reference to a `Path` representing the target path.
+///
+/// # Returns
+///
+/// * `bool` - Returns `true` if either of above conditions are true, and `false` otherwise.
+#[cfg(unix)]
+pub fn are_hardlinks_or_one_way_symlink_to_same_file(source: &Path, target: &Path) -> bool {
+    let source_metadata = match fs::metadata(source) {
+        Ok(metadata) => metadata,
+        Err(_) => return false,
+    };
+
+    let target_metadata = match fs::symlink_metadata(target) {
+        Ok(metadata) => metadata,
+        Err(_) => return false,
+    };
+
+    source_metadata.ino() == target_metadata.ino() && source_metadata.dev() == target_metadata.dev()
+}
+
 #[cfg(test)]
 mod tests {
     // Note this useful idiom: importing names from outer (for mod tests) scope.