Allow clients of the pciids API to set the pci.ids filepath

Signed-off-by: Christopher Desiniotis <cdesiniotis@nvidia.com>

pkg/pciids/pciids.go

@@ -172,24 +172,48 @@ type parser struct {
 	}
 }
 
+// Various locations of pci.ids for different distributions. These may be more
+// up to date then the embedded pci.ids db
+var defaultPCIdbPaths = []string{
+	"/usr/share/misc/pci.ids",   // Ubuntu
+	"/usr/local/share/pci.ids",  // RHEL like with manual update
+	"/usr/share/hwdata/pci.ids", // RHEL like
+	"/usr/share/pci.ids",        // SUSE
+}
+
 // This is a fallback if all of the locations fail
 //go:embed default_pci.ids
 var defaultPCIdb []byte
 
 // NewDB Parse the PCI DB in its default locations or use the default
 // builtin pci.ids db.
-func NewDB() Interface {
+func NewDB(opts ...Option) Interface {
-	// Various locations of pci.ids for differente distributions these may be more
+	db := &pcidb{}
-	// up to date then the embedded pci.ids db
+	for _, opt := range opts {
-	pcidbs := []string{
+		opt(db)
-		"/usr/share/misc/pci.ids",   // Ubuntu
-		"/usr/local/share/pci.ids",  // RHEL like with manual update
-		"/usr/share/hwdata/pci.ids", // RHEL like
-		"/usr/share/pci.ids",        // SUSE
 	}
+
+	pcidbs := defaultPCIdbPaths
+	if db.path != "" {
+		pcidbs = append([]string{db.path}, defaultPCIdbPaths...)
+	}
+
 	return newParser(pcidbs).parse()
 }
 
+// Option defines a function for passing options to the NewDB() call
+type Option func(*pcidb)
+
+// WithFilePath provides an Option to set the file path
+// for the pciids database used by pciids interface.
+// The file path provided takes precedence over all other
+// paths.
+func WithFilePath(path string) Option {
+	return func(db *pcidb) {
+		db.path = path
+	}
+}
+
 // newParser will attempt to read the db pci.ids from well known places or fall
 // back to an internal db
 func newParser(pcidbs []string) *parser {
@@ -247,6 +271,7 @@ func (d *pcidb) GetClassName(classID uint32) string {
 type pcidb struct {
 	vendors map[uint16]vendor
 	classes map[uint32]class
+	path    string
 }
 
 // vendor PCI vendors/devices/subVendors/SubDevices