Share vendor-dir extraction logic between extractor and configure-baseline script

go/extractor/configurebaseline/configurebaseline.go

@@ -6,6 +6,8 @@ import (
 	"os"
 	"path"
 	"path/filepath"
+
+	"github.com/github/codeql-go/extractor/util"
 )
 
 func fileExists(path string) bool {
@@ -26,7 +28,7 @@ type BaselineConfig struct {
 func GetConfigBaselineAsJSON(rootDir string) ([]byte, error) {
 	vendorDirs := make([]string, 0)
 
-	if os.Getenv("CODEQL_EXTRACTOR_GO_EXTRACT_VENDOR_DIRS") == "true" {
+	if util.IsVendorDirExtractionEnabled() {
 		// The user wants vendor directories scanned; emit an empty report.
 	} else {
 		filepath.WalkDir(rootDir, func(dirPath string, d fs.DirEntry, err error) error {

go/extractor/extractor.go

@@ -199,7 +199,7 @@ func ExtractWithFlags(buildFlags []string, patterns []string) error {
 
 	// If CODEQL_EXTRACTOR_GO_EXTRACT_VENDOR_DIRS is "true", we extract `vendor` directories;
 	// otherwise (the default) is to exclude them from extraction
-	includeVendor := os.Getenv("CODEQL_EXTRACTOR_GO_EXTRACT_VENDOR_DIRS") == "true"
+	includeVendor := util.IsVendorDirExtractionEnabled()
 	if !includeVendor {
 		excludedDirs = append(excludedDirs, "vendor")
 	}

go/extractor/util/extractvendordirs.go

@@ -0,0 +1,9 @@
+package util
+
+import (
+	"os"
+)
+
+func IsVendorDirExtractionEnabled() bool {
+	return os.Getenv("CODEQL_EXTRACTOR_GO_EXTRACT_VENDOR_DIRS") == "true"
+}