fix(packagesdrv): resolve external/ go packages (#3332)

go/tools/gopackagesdriver/bazel_json_builder.go

@@ -19,6 +19,7 @@ import (
 	"fmt"
 	"path/filepath"
 	"strings"
+	"regexp"
 )
 
 type BazelJSONBuilder struct {
@@ -32,13 +33,24 @@ const (
 
 var _defaultKinds = []string{"go_library", "go_test", "go_binary"}
 
+var externalRe = regexp.MustCompile(".*\\/external\\/([^\\/]+)(\\/(.*))?\\/([^\\/]+.go)")
+
 func (b *BazelJSONBuilder) fileQuery(filename string) string {
+	label := filename
+
 	if filepath.IsAbs(filename) {
-		fp, _ := filepath.Rel(b.bazel.WorkspaceRoot(), filename)
-		filename = fp
+		label, _ = filepath.Rel(b.bazel.WorkspaceRoot(), filename)
 	}
+
+	if matches := externalRe.FindStringSubmatch(filename); len(matches) == 5 {
+		// if filepath is for a third party lib, we need to know, what external
+		// library this file is part of.
+		matches = append(matches[:2], matches[3:]...)
+		label = fmt.Sprintf("@%s//%s", matches[1], strings.Join(matches[2:], ":"))
+	}
+
 	kinds := append(_defaultKinds, additionalKinds...)
-	return fmt.Sprintf(`kind("%s", same_pkg_direct_rdeps("%s"))`, strings.Join(kinds, "|"), filename)
+	return fmt.Sprintf(`kind("%s", same_pkg_direct_rdeps("%s"))`, strings.Join(kinds, "|"), label)
 }
 
 func (b *BazelJSONBuilder) packageQuery(importPath string) string {