From 48f706b0f3c90c776506f6e2e1240f79a051b9da Mon Sep 17 00:00:00 2001
From: Jakub Sztandera <kubuxu@protonmail.ch>
Date: Tue, 20 Mar 2018 13:55:52 +0100
Subject: [PATCH] fix(mfs): Directory.Path not working, add test

Credit goes to @ridewindx

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protonmail.ch>
---
 mfs/dir.go      | 11 +++++++++--
 mfs/mfs_test.go |  5 +++++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/mfs/dir.go b/mfs/dir.go
index 08b703fb2..0cc6e6568 100644
--- a/mfs/dir.go
+++ b/mfs/dir.go
@@ -404,8 +404,15 @@ func (d *Directory) Path() string {
 	cur := d
 	var out string
 	for cur != nil {
-		out = path.Join(cur.name, out)
-		cur = cur.parent.(*Directory)
+		switch parent := cur.parent.(type) {
+		case *Directory:
+			out = path.Join(cur.name, out)
+			cur = parent
+		case *Root:
+			return "/" + out
+		default:
+			panic("directory parent neither a directory nor a root")
+		}
 	}
 	return out
 }
diff --git a/mfs/mfs_test.go b/mfs/mfs_test.go
index d7124bdf1..25e61854b 100644
--- a/mfs/mfs_test.go
+++ b/mfs/mfs_test.go
@@ -324,6 +324,11 @@ func TestDirectoryLoadFromDag(t *testing.T) {
 
 	topd := topi.(*Directory)
 
+	path := topd.Path()
+	if path != "/foo" {
+		t.Fatalf("Expected path '/foo', got '%s'", path)
+	}
+
 	// mkdir over existing but unloaded child file should fail
 	_, err = topd.Mkdir("a")
 	if err == nil {