From d3276fdc63b34a2d6035e15106b74af73ea1b241 Mon Sep 17 00:00:00 2001
From: Jeremy Yallop <yallop@docker.com>
Date: Mon, 12 Dec 2016 15:56:36 +0000
Subject: [PATCH] Cache non-symlinks in realpathSync.

Extend `fs.realpathSync` to cache the results for paths that are not
symlinks in addition to caching symlink mappings.

Signed-off-by: Jeremy Yallop <yallop@docker.com>
---
 lib/fs.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/fs.js b/lib/fs.js
index 27614e5cf1febc..f60e3cf11b5614 100644
--- a/lib/fs.js
+++ b/lib/fs.js
@@ -1531,6 +1531,7 @@ fs.realpathSync = function realpathSync(p, options) {
       var stat = fs.lstatSync(base);
       if (!stat.isSymbolicLink()) {
         knownHard[base] = true;
+        if (cache) cache.set(base, base);
         continue;
       }