Use a symlink to pass the linguist path

1 files changed, 16 insertions, 7 deletions

diff --git a/internal/linguist/linguist.go b/internal/linguist/linguist.go
index 42f8f0e4f..f2158a566 100644
--- a/internal/linguist/linguist.go
+++ b/internal/linguist/linguist.go
@@ -53,21 +53,30 @@ func Color(language string) string {
 
 // LoadColors loads the name->color map from the Linguist gem.
 func LoadColors() error {
-	// We can't use 'bundle show' because that sometimes prints garbage on
-	// its stdout.
-	rubyScript := `print Bundler.rubygems.find_name('github-linguist').first.full_gem_path`
-	cmd := exec.Command("bundle", "exec", "ruby", "-e", rubyScript)
+	linguistPathSymlink, err := ioutil.TempFile("", "gitaly-linguist-path")
+	if err != nil {
+		return err
+	}
+	defer os.Remove(linguistPathSymlink.Name())
+
+	if err := linguistPathSymlink.Close(); err != nil {
+		return err
+	}
+
+	// We use a symlink because we cannot trust Bundler to not print garbage
+	// on its stdout.
+	rubyScript := `FileUtils.ln_sf(Bundler.rubygems.find_name('github-linguist').first.full_gem_path, ARGV.first)`
+	cmd := exec.Command("bundle", "exec", "ruby", "-rfileutils", "-e", rubyScript, linguistPathSymlink.Name())
 	cmd.Dir = config.Config.Ruby.Dir
 
-	linguistPath, err := cmd.Output()
-	if err != nil {
+	if err := cmd.Run(); err != nil {
 		if exitError, ok := err.(*exec.ExitError); ok {
 			err = fmt.Errorf("%v; stderr: %q", exitError, exitError.Stderr)
 		}
 		return err
 	}
 
-	languageJSON, err := ioutil.ReadFile(path.Join(string(linguistPath), "lib/linguist/languages.json"))
+	languageJSON, err := ioutil.ReadFile(path.Join(linguistPathSymlink.Name(), "lib/linguist/languages.json"))
 	if err != nil {
 		return err
 	}