Add symlinks package with Resolve function

This change adds a symlinks.Resolve function for resolving symlinks and
updates usages across the code to make use of it.

Signed-off-by: Evan Lezar <elezar@nvidia.com>

internal/lookup/symlinks/symlink.go

@@ -0,0 +1,35 @@
+/**
+# Copyright (c) NVIDIA CORPORATION.  All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+**/
+
+package symlinks
+
+import (
+	"fmt"
+	"os"
+)
+
+// Resolve returns the link target of the specified filename or the filename if it is not a link.
+func Resolve(filename string) (string, error) {
+	info, err := os.Lstat(filename)
+	if err != nil {
+		return filename, fmt.Errorf("failed to get file info: %v", info)
+	}
+	if info.Mode()&os.ModeSymlink == 0 {
+		return filename, nil
+	}
+
+	return os.Readlink(filename)
+}