Skip non-regular files in tryResolveLibrary

pkg/nvlib/info/root.go

@@ -18,6 +18,7 @@ package info
 
 import (
 	"fmt"
+	"os"
 	"path/filepath"
 
 	"github.com/NVIDIA/go-nvml/pkg/dl"
@@ -68,6 +69,10 @@ func (r root) tryResolveLibrary(libraryName string) string {
 		if err != nil {
 			continue
 		}
+		info, err := os.Stat(resolved)
+		if err != nil || !info.Mode().IsRegular() {
+			continue
+		}
 		return resolved
 	}
 

pkg/nvlib/info/root_test.go

@@ -0,0 +1,86 @@
+/**
+# 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 info
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestTryResolveLibrary(t *testing.T) {
+	const libraryName = "libnvidia-ml.so.1"
+
+	testCases := []struct {
+		description string
+		// dirs and files are created relative to the test root before resolving.
+		dirs  []string
+		files []string
+		// expected is the resolved path relative to the test root, or "" if
+		// the input library name is expected to be returned as is.
+		expected string
+	}{
+		{
+			description: "library in first search path",
+			files:       []string{"usr/lib64/" + libraryName},
+			expected:    "usr/lib64/" + libraryName,
+		},
+		{
+			description: "directory in earlier search path does not shadow library",
+			dirs:        []string{"usr/lib64/" + libraryName},
+			files:       []string{"usr/lib/x86_64-linux-gnu/" + libraryName},
+			expected:    "usr/lib/x86_64-linux-gnu/" + libraryName,
+		},
+		{
+			description: "only directories found",
+			dirs:        []string{"usr/lib64/" + libraryName},
+			expected:    "",
+		},
+		{
+			description: "library not found",
+			expected:    "",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.description, func(t *testing.T) {
+			testRoot := t.TempDir()
+			for _, d := range tc.dirs {
+				require.NoError(t, os.MkdirAll(filepath.Join(testRoot, d), 0o755))
+			}
+			for _, f := range tc.files {
+				path := filepath.Join(testRoot, f)
+				require.NoError(t, os.MkdirAll(filepath.Dir(path), 0o755))
+				require.NoError(t, os.WriteFile(path, []byte{}, 0o644))
+			}
+
+			resolved := root(testRoot).tryResolveLibrary(libraryName)
+			if tc.expected == "" {
+				require.Equal(t, libraryName, resolved)
+				return
+			}
+
+			// t.TempDir may itself contain symlinks, so compare against the
+			// resolved expected path.
+			expected, err := filepath.EvalSymlinks(filepath.Join(testRoot, tc.expected))
+			require.NoError(t, err)
+			require.Equal(t, expected, resolved)
+		})
+	}
+}