Specify library search paths for CSV CDI spec generation

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

cmd/nvidia-ctk/cdi/generate/generate.go

@@ -52,6 +52,7 @@ type options struct {
 
 	csv struct {
 		files              cli.StringSlice
+		librarySearchPaths cli.StringSlice
 	}
 }
 
@@ -134,6 +135,11 @@ func (m command) build() *cli.Command {
 			Value:       cli.NewStringSlice(csv.DefaultFileList()...),
 			Destination: &opts.csv.files,
 		},
+		&cli.StringSliceFlag{
+			Name:        "csv.library-search-path",
+			Usage:       "Specify the path to search for libraries when discovering the entities that should be included in the CDI specification. This currently only affects CDI mode",
+			Destination: &opts.csv.librarySearchPaths,
+		},
 	}
 
 	return &c
@@ -227,6 +233,7 @@ func (m command) generateSpec(opts *options) (spec.Interface, error) {
 		nvcdi.WithDeviceNamer(deviceNamer),
 		nvcdi.WithMode(string(opts.mode)),
 		nvcdi.WithCSVFiles(opts.csv.files.Value()),
+		nvcdi.WithLibrarySearchPaths(opts.csv.librarySearchPaths.Value()),
 	)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create CDI library: %v", err)

internal/platform-support/tegra/csv.go

@@ -28,7 +28,7 @@ import (
 // newDiscovererFromCSVFiles creates a discoverer for the specified CSV files. A logger is also supplied.
 // The constructed discoverer is comprised of a list, with each element in the list being associated with a
 // single CSV files.
-func newDiscovererFromCSVFiles(logger logger.Interface, files []string, driverRoot string, nvidiaCTKPath string) (discover.Discover, error) {
+func newDiscovererFromCSVFiles(logger logger.Interface, files []string, driverRoot string, nvidiaCTKPath string, librarySearchPaths []string) (discover.Discover, error) {
 	if len(files) == 0 {
 		logger.Warningf("No CSV files specified")
 		return discover.None{}, nil
@@ -51,7 +51,12 @@ func newDiscovererFromCSVFiles(logger logger.Interface, files []string, driverRo
 	)
 
 	// Libraries and symlinks use the same locator.
-	symlinkLocator := lookup.NewSymlinkLocator(lookup.WithLogger(logger), lookup.WithRoot(driverRoot))
+	searchPaths := append(librarySearchPaths, "/")
+	symlinkLocator := lookup.NewSymlinkLocator(
+		lookup.WithLogger(logger),
+		lookup.WithRoot(driverRoot),
+		lookup.WithSearchPaths(searchPaths...),
+	)
 	libraries := discover.NewMounts(
 		logger,
 		symlinkLocator,

internal/platform-support/tegra/tegra.go

@@ -29,6 +29,7 @@ type tegraOptions struct {
 	csvFiles           []string
 	driverRoot         string
 	nvidiaCTKPath      string
+	librarySearchPaths []string
 }
 
 // Option defines a functional option for configuring a Tegra discoverer.
@@ -41,7 +42,7 @@ func New(opts ...Option) (discover.Discover, error) {
 		opt(o)
 	}
 
-	csvDiscoverer, err := newDiscovererFromCSVFiles(o.logger, o.csvFiles, o.driverRoot, o.nvidiaCTKPath)
+	csvDiscoverer, err := newDiscovererFromCSVFiles(o.logger, o.csvFiles, o.driverRoot, o.nvidiaCTKPath, o.librarySearchPaths)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create CSV discoverer: %v", err)
 	}
@@ -98,3 +99,10 @@ func WithNVIDIACTKPath(nvidiaCTKPath string) Option {
 		o.nvidiaCTKPath = nvidiaCTKPath
 	}
 }
+
+// WithLibrarySearchPaths sets the library search paths for the discoverer.
+func WithLibrarySearchPaths(librarySearchPaths ...string) Option {
+	return func(o *tegraOptions) {
+		o.librarySearchPaths = librarySearchPaths
+	}
+}

pkg/nvcdi/lib-csv.go

@@ -44,6 +44,7 @@ func (l *csvlib) GetAllDeviceSpecs() ([]specs.Device, error) {
 		tegra.WithDriverRoot(l.driverRoot),
 		tegra.WithNVIDIACTKPath(l.nvidiaCTKPath),
 		tegra.WithCSVFiles(l.csvFiles),
+		tegra.WithLibrarySearchPaths(l.librarySearchPaths...),
 	)
 	if err != nil {
 		return nil, fmt.Errorf("failed to create discoverer for CSV files: %v", err)

pkg/nvcdi/lib.go

@@ -45,6 +45,7 @@ type nvcdilib struct {
 	deviceNamer        DeviceNamer
 	driverRoot         string
 	nvidiaCTKPath      string
+	librarySearchPaths []string
 
 	csvFiles []string
 

pkg/nvcdi/options.go

@@ -103,3 +103,11 @@ func WithCSVFiles(csvFiles []string) Option {
 		o.csvFiles = csvFiles
 	}
 }
+
+// WithLibrarySearchPaths sets the library search paths.
+// This is currently only used for CSV-mode.
+func WithLibrarySearchPaths(paths []string) Option {
+	return func(o *nvcdilib) {
+		o.librarySearchPaths = paths
+	}
+}