Handle symlinks in src/bootstrap/clean.rs (mostly) -- resolves #40860.

src/bootstrap/clean.rs

@@ -44,36 +44,38 @@ pub fn clean(build: &Build) {
 }
 
 fn rm_rf(path: &Path) {
-    if !path.exists() {
-        return
-    }
-    if path.is_file() {
-        return do_op(path, "remove file", |p| fs::remove_file(p));
-    }
-
-    for file in t!(fs::read_dir(path)) {
-        let file = t!(file).path();
+    match path.symlink_metadata() {
+        Err(e) => {
+            if e.kind() == ErrorKind::NotFound {
+                return;
+            }
+            panic!("failed to get metadata for file {}: {}", path.display(), e);
+        },
+        Ok(metadata) => {
+            if metadata.file_type().is_file() || metadata.file_type().is_symlink() {
+                do_op(path, "remove file", |p| fs::remove_file(p));
+                return;
+            }
 
-        if file.is_dir() {
-            rm_rf(&file);
-        } else {
-            // On windows we can't remove a readonly file, and git will
-            // often clone files as readonly. As a result, we have some
-            // special logic to remove readonly files on windows.
-            do_op(&file, "remove file", |p| fs::remove_file(p));
-        }
-    }
-    do_op(path, "remove dir", |p| fs::remove_dir(p));
+            for file in t!(fs::read_dir(path)) {
+                rm_rf(&t!(file).path());
+            }
+            do_op(path, "remove dir", |p| fs::remove_dir(p));
+        },
+    };
 }
 
 fn do_op<F>(path: &Path, desc: &str, mut f: F)
     where F: FnMut(&Path) -> io::Result<()>
 {
     match f(path) {
         Ok(()) => {}
+        // On windows we can't remove a readonly file, and git will often clone files as readonly.
+        // As a result, we have some special logic to remove readonly files on windows.
+        // This is also the reason that we can't use things like fs::remove_dir_all().
         Err(ref e) if cfg!(windows) &&
                       e.kind() == ErrorKind::PermissionDenied => {
-            let mut p = t!(path.metadata()).permissions();
+            let mut p = t!(path.symlink_metadata()).permissions();
             p.set_readonly(false);
             t!(fs::set_permissions(path, p));
             f(path).unwrap_or_else(|e| {