Move libcuda locator to internal/lookup package

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

internal/lookup/cuda/cuda.go

@@ -0,0 +1,102 @@
+/**
+# 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 cuda
+
+import (
+	"path/filepath"
+
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/lookup"
+	"github.com/sirupsen/logrus"
+)
+
+type cudaLocator struct {
+	logger     *logrus.Logger
+	driverRoot string
+}
+
+// Options is a function that configures a cudaLocator.
+type Options func(*cudaLocator)
+
+// WithLogger is an option that configures the logger used by the locator.
+func WithLogger(logger *logrus.Logger) Options {
+	return func(c *cudaLocator) {
+		c.logger = logger
+	}
+}
+
+// WithDriverRoot is an option that configures the driver root used by the locator.
+func WithDriverRoot(driverRoot string) Options {
+	return func(c *cudaLocator) {
+		c.driverRoot = driverRoot
+	}
+}
+
+// New creates a new CUDA library locator.
+func New(opts ...Options) lookup.Locator {
+	c := &cudaLocator{}
+	for _, opt := range opts {
+		opt(c)
+	}
+
+	if c.logger == nil {
+		c.logger = logrus.StandardLogger()
+	}
+	if c.driverRoot == "" {
+		c.driverRoot = "/"
+	}
+
+	return c
+}
+
+// Locate returns the path to the libcuda.so.RMVERSION file.
+// libcuda.so is prefixed to the specified pattern.
+func (l *cudaLocator) Locate(pattern string) ([]string, error) {
+	ldcacheLocator, err := lookup.NewLibraryLocator(
+		l.logger,
+		l.driverRoot,
+	)
+	if err != nil {
+		l.logger.Debugf("Failed to create LDCache locator: %v", err)
+	}
+
+	fullPattern := "libcuda.so" + pattern
+
+	candidates, err := ldcacheLocator.Locate("libcuda.so")
+	if err == nil {
+		for _, c := range candidates {
+			if match, err := filepath.Match(fullPattern, filepath.Base(c)); err != nil || !match {
+				l.logger.Debugf("Skipping non-matching candidate %v: %v", c, err)
+				continue
+			}
+			return []string{c}, nil
+		}
+	}
+	l.logger.Debugf("Could not locate %q in LDCache: Checking predefined library paths.", pattern)
+
+	pathLocator := lookup.NewFileLocator(
+		lookup.WithLogger(l.logger),
+		lookup.WithRoot(l.driverRoot),
+		lookup.WithSearchPaths(
+			"/usr/lib64",
+			"/usr/lib/x86_64-linux-gnu",
+			"/usr/lib/aarch64-linux-gnu",
+		),
+		lookup.WithCount(1),
+	)
+
+	return pathLocator.Locate(fullPattern)
+}

pkg/nvcdi/driver-nvml.go

@@ -23,6 +23,7 @@ import (
 
 	"github.com/NVIDIA/nvidia-container-toolkit/internal/discover"
 	"github.com/NVIDIA/nvidia-container-toolkit/internal/lookup"
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/lookup/cuda"
 	"github.com/sirupsen/logrus"
 	"gitlab.com/nvidia/cloud-native/go-nvlib/pkg/nvml"
 )
@@ -135,11 +136,10 @@ func NewDriverBinariesDiscoverer(logger *logrus.Logger, driverRoot string) disco
 func getVersionLibs(logger *logrus.Logger, driverRoot string, version string) ([]string, error) {
 	logger.Infof("Using driver version %v", version)
 
-	l := cudaLocator{
+	libCudaPaths, err := cuda.New(
-		logger:     logger,
+		cuda.WithLogger(logger),
-		driverRoot: driverRoot,
+		cuda.WithDriverRoot(driverRoot),
-	}
+	).Locate("." + version)
-	libCudaPaths, err := l.Locate("libcuda.so." + version)
 	if err != nil {
 		return nil, fmt.Errorf("failed to locate libcuda.so.%v: %v", version, err)
 	}
@@ -167,43 +167,3 @@ func getVersionLibs(logger *logrus.Logger, driverRoot string, version string) ([
 
 	return relative, nil
 }
-
-type cudaLocator struct {
-	logger     *logrus.Logger
-	driverRoot string
-}
-
-// Locate returns the path to the libcuda.so.RMVERSION file.
-func (l *cudaLocator) Locate(pattern string) ([]string, error) {
-	ldcacheLocator, err := lookup.NewLibraryLocator(
-		l.logger,
-		l.driverRoot,
-	)
-	if err != nil {
-		l.logger.Debugf("Failed to create LDCache locator: %v", err)
-	}
-	candidates, err := ldcacheLocator.Locate("libcuda.so")
-	if err == nil {
-		for _, c := range candidates {
-			if match, err := filepath.Match(pattern, filepath.Base(c)); err != nil || !match {
-				l.logger.Debugf("Skipping non-matching candidate %v: %v", c, err)
-				continue
-			}
-			return []string{c}, nil
-		}
-	}
-	l.logger.Debugf("Could not locate %q in LDCache: Checking predefined library paths.", pattern)
-
-	pathLocator := lookup.NewFileLocator(
-		lookup.WithLogger(l.logger),
-		lookup.WithRoot(l.driverRoot),
-		lookup.WithSearchPaths(
-			"/usr/lib64",
-			"/usr/lib/x86_64-linux-gnu",
-			"/usr/lib/aarch64-linux-gnu",
-		),
-		lookup.WithCount(1),
-	)
-
-	return pathLocator.Locate(pattern)
-}

pkg/nvcdi/management.go

@@ -23,6 +23,7 @@ import (
 
 	"github.com/NVIDIA/nvidia-container-toolkit/internal/discover"
 	"github.com/NVIDIA/nvidia-container-toolkit/internal/edits"
+	"github.com/NVIDIA/nvidia-container-toolkit/internal/lookup/cuda"
 	"github.com/NVIDIA/nvidia-container-toolkit/pkg/nvcdi/spec"
 	"github.com/container-orchestrated-devices/container-device-interface/pkg/cdi"
 	"github.com/container-orchestrated-devices/container-device-interface/specs-go"
@@ -84,12 +85,10 @@ func (m *managementlib) getCudaVersion() (string, error) {
 		return version, nil
 	}
 
-	l := cudaLocator{
+	libCudaPaths, err := cuda.New(
-		logger:     m.logger,
+		cuda.WithLogger(m.logger),
-		driverRoot: m.driverRoot,
+		cuda.WithDriverRoot(m.driverRoot),
-	}
+	).Locate(".*.*.*")
-
-	libCudaPaths, err := l.Locate("libcuda.so.*.*.*")
 	if err != nil {
 		return "", fmt.Errorf("failed to locate libcuda.so: %v", err)
 	}