Fallback to package dir for discovering go.mod

This reverts to the old behavior of reusing the package directory when looking for go.mod. It seems unlikely that this is the right thing to do since we failed to find the module directory, but this behavior should be consistent with what we had before.

Author: grddev

go/extractor/extractor.go

@@ -186,8 +186,12 @@ func ExtractWithFlags(buildFlags []string, patterns []string) error {
 
 			extraction.extractPackage(pkg)
 
-			if pkgInfo.ModDir != "" {
-				modPath := filepath.Join(pkgInfo.ModDir, "go.mod")
+			modDir := pkgInfo.ModDir
+			if modDir == "" {
+				modDir = pkgInfo.PkgDir
+			}
+			if modDir != "" {
+				modPath := filepath.Join(modDir, "go.mod")
 				if util.FileExists(modPath) {
 					log.Printf("Extracting %s", modPath)
 					start := time.Now()