Avoid unwrap() if non UTF-8 in the require_literal_leading_dot flow

Drop the path if UTF-8 validation fails and is required for string comparison,
instead of panicing.
Add a test exhibiting the problem (fixed with this change).

Author: Jongy

src/lib.rs

@@ -943,8 +943,13 @@ fn fill_todo(
             match dirs {
                 Ok(mut children) => {
                     if options.require_literal_leading_dot {
-                        children
-                            .retain(|x| !x.file_name().unwrap().to_str().unwrap().starts_with('.'));
+                        children.retain(|x| {
+                            !x.file_name()
+                                .unwrap()
+                                .to_str()
+                                // FIXME (#9639): This needs to handle non-utf8 paths
+                                .is_none_or(|s| s.starts_with('.'))
+                        });
                     }
                     children.sort_by(|p1, p2| p2.file_name().cmp(&p1.file_name()));
                     todo.extend(children.into_iter().map(|x| Ok((x, idx))));

tests/glob-std.rs

@@ -18,12 +18,15 @@ extern crate tempdir;
 use glob::{glob, glob_with};
 use std::env;
 use std::fs;
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
 use tempdir::TempDir;
 
 #[test]
 fn main() {
-    fn mk_file(path: &str, directory: bool) {
+    fn mk_file<P>(path: P, directory: bool)
+    where
+        P: AsRef<Path>,
+    {
         if directory {
             fs::create_dir(path).unwrap();
         } else {
@@ -474,4 +477,23 @@ fn main() {
             )
         );
     }
+
+    #[cfg(target_os = "linux")]
+    {
+        use std::ffi::OsString;
+        use std::os::unix::ffi::OsStringExt;
+
+        // create a non-utf8 file
+        let non_utf8 = OsString::from_vec(b"i/qwe/.\xff\xff\xff\xff".into());
+        assert!(non_utf8.to_str().is_none());
+        mk_file(PathBuf::from(non_utf8), false);
+
+        // this tests a case where require_literal_leading_dot panicked.
+        assert_eq!(options.require_literal_leading_dot, true);
+        // ensure that we don't panic
+        assert_eq!(
+            glob_with_vec("i/qwe/nothing*", options),
+            Vec::<PathBuf>::new()
+        );
+    }
 }