ls -l: show an error when symlink not readable

switching to match and handle the error

Will help with tests/ls/stat-failed.sh

src/uu/ls/src/ls.rs

@@ -2908,7 +2908,8 @@ fn display_file_name(
         && path.file_type(out).unwrap().is_symlink()
         && !path.must_dereference
     {
-        if let Ok(target) = path.p_buf.read_link() {
+        match path.p_buf.read_link() {
+            Ok(target) => {
                 name.push_str(" -> ");
 
                 // We might as well color the symlink output after the arrow.
@@ -2959,6 +2960,14 @@ fn display_file_name(
                     name.push_str(&escape_name(target.as_os_str(), &config.quoting_style));
                 }
             }
+            Err(err) => {
+                show!(LsError::IOErrorContext(
+                    err,
+                    path.p_buf.to_path_buf(),
+                    false
+                ));
+            }
+        }
     }
 
     // Prepend the security context to the `name` and adjust `width` in order

tests/by-util/test_ls.rs

@@ -3503,3 +3503,22 @@ fn test_invalid_utf8() {
     at.touch(filename);
     ucmd.succeeds();
 }
+
+#[cfg(all(unix, feature = "chmod"))]
+#[test]
+fn test_ls_perm_io_errors() {
+    let scene = TestScenario::new(util_name!());
+    let at = &scene.fixtures;
+    at.mkdir("d");
+    at.symlink_file("/", "d/s");
+
+    scene.ccmd("chmod").arg("600").arg("d").succeeds();
+
+    scene
+        .ucmd()
+        .arg("-l")
+        .arg("d")
+        .fails()
+        .code_is(1)
+        .stderr_contains("Permission denied");
+}