Golang vendor dir extraction: add extractor option

Author: smowton

go/codeql-extractor.yml

@@ -27,3 +27,10 @@ options:
       The default is 'false'.
     type: string
     pattern: "^(false|true)$"
+  extract_vendor_dirs:
+    title: Whether to include Go vendor directories in the CodeQL database.
+    description: >
+      A value indicating whether Go vendor directories should be included in the CodeQL database.
+      The default is 'false'.
+    type: string
+    pattern: "^(false|true)$"

go/extractor/extractor.go

@@ -233,7 +233,7 @@ func ExtractWithFlags(buildFlags []string, patterns []string, extractTests bool)
 	// Construct a list of directory segments to exclude from extraction, starting with ".."
 	excludedDirs := []string{`\.\.`}
 
-	// If CODEQL_EXTRACTOR_GO_EXTRACT_VENDOR_DIRS is "true", we extract `vendor` directories;
+	// If CODEQL_EXTRACTOR_GO_[OPTION_]EXTRACT_VENDOR_DIRS is "true", we extract `vendor` directories;
 	// otherwise (the default) is to exclude them from extraction
 	includeVendor := util.IsVendorDirExtractionEnabled()
 	if !includeVendor {

go/extractor/util/extractvendordirs.go

@@ -5,5 +5,6 @@ import (
 )
 
 func IsVendorDirExtractionEnabled() bool {
-	return os.Getenv("CODEQL_EXTRACTOR_GO_EXTRACT_VENDOR_DIRS") == "true"
+	return os.Getenv("CODEQL_EXTRACTOR_GO_EXTRACT_VENDOR_DIRS") == "true" ||
+		os.Getenv("CODEQL_EXTRACTOR_GO_OPTION_EXTRACT_VENDOR_DIRS") == "true"
 }

go/ql/integration-tests/extract-vendor/test.py

@@ -4,3 +4,6 @@
 def test(codeql, go):
     os.environ["CODEQL_EXTRACTOR_GO_EXTRACT_VENDOR_DIRS"] = "true"
     codeql.database.create(source_root="src")
+
+def test_extractor_option(codeql, go):
+    codeql.database.create(source_root="src", extractor_option = "extract_vendor_dirs=true")