check there are not 2+ lines

Signed-off-by: Tim Vaillancourt <[email protected]>

Author: timvaillancourt

test/ci_workflow_gen.go

@@ -237,15 +237,19 @@ func getGitRefSHA(ctx context.Context, url, branchOrTag string) (string, error)
 		return "", err
 	}
 
-	// git ls-remote returns two text columns: a commit SHA and a reference.
+	// 'git ls-remote <url> <branchOrTag>' returns two text columns: a commit
+	// SHA and a reference. We expect the stdout to be a single line, which
+	// should always be true (but we still validate).
 	// Example:
 	//    $ git ls-remote https://github.com/vitessio/go-junit-report HEAD
 	//    99fa7f0daf16db969f54a49139a14471e633e6e8	HEAD
-	fields := strings.Fields(stdout.String())
-	if len(fields) != 2 {
-		return "", fmt.Errorf("cannot parse output of 'git ls-remote' for %q", url)
+	for line := range strings.Lines(stdout.String()) {
+		fields := strings.Fields(line)
+		if len(fields) == 2 {
+			return fields[0], nil
+		}
 	}
-	return fields[0], nil
+	return "", fmt.Errorf("cannot parse output of 'git ls-remote' for %q", url)
 }
 
 // getGitMetas concurrently fetches Git metadata for workflow dependencies.