From e283dcf1bc0043751713e8d7b54bf9ed4c59c3b9 Mon Sep 17 00:00:00 2001
From: Aaron Jacobs <jacobsa@google.com>
Date: Mon, 16 Mar 2015 12:38:17 +1100
Subject: [PATCH] Added an NlinkIs matcher.

---
 fusetesting/stat.go        | 22 ++++++++++++++++++++++
 fusetesting/stat_darwin.go |  6 ++++++
 2 files changed, 28 insertions(+)

diff --git a/fusetesting/stat.go b/fusetesting/stat.go
index 8077624..c084303 100644
--- a/fusetesting/stat.go
+++ b/fusetesting/stat.go
@@ -83,3 +83,25 @@ func birthtimeIs(c interface{}, expected time.Time) error {
 
 	return nil
 }
+
+// Match os.FileInfo values that specify a number of links equal to the given
+// number. On platforms where there is no nlink field available, match all
+// os.FileInfo values.
+func NlinkIs(expected uint64) oglematchers.Matcher {
+	return oglematchers.NewMatcher(
+		func(c interface{}) error { return nlinkIs(c, expected) },
+		fmt.Sprintf("nlink is %v", expected))
+}
+
+func nlinkIs(c interface{}, expected uint64) error {
+	fi, ok := c.(os.FileInfo)
+	if !ok {
+		return fmt.Errorf("which is of type %v", reflect.TypeOf(c))
+	}
+
+	if actual, ok := extractNlink(fi.Sys()); ok && actual != expected {
+		return fmt.Errorf("which has nlink == %v", actual)
+	}
+
+	return nil
+}
diff --git a/fusetesting/stat_darwin.go b/fusetesting/stat_darwin.go
index 2b84caf..9b4ebf5 100644
--- a/fusetesting/stat_darwin.go
+++ b/fusetesting/stat_darwin.go
@@ -30,3 +30,9 @@ func extractBirthtime(sys interface{}) (birthtime time.Time, ok bool) {
 	ok = true
 	return
 }
+
+func extractNlink(sys interface{}) (nlink uint64, ok bool) {
+	nlink = uint64(sys.(*syscall.Stat_t).Nlink)
+	ok = true
+	return
+}