From a83e80759dfb497364b59c857d15e3fae38e3c23 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timoth=C3=A9e=20Rebours?= <tim@seald.io>
Date: Tue, 12 Dec 2023 17:51:45 +0100
Subject: [PATCH] Fix #48

---
 CHANGELOG.md       | 4 ++++
 lib/persistence.js | 6 +++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index c77fc4f..52ca22c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres
 to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+### Fixed
+- Fixed EPERM Exception when datastore is at the root of a disk on Windows [#48](https://github.com/seald/nedb/issues/48)
+
 ## [4.0.2] - 2023-05-05
 ### Fixed
 - Fixed typo in documentation [#36](https://github.com/seald/nedb/pull/36)
diff --git a/lib/persistence.js b/lib/persistence.js
index 28e0e21..f10ec57 100755
--- a/lib/persistence.js
+++ b/lib/persistence.js
@@ -373,7 +373,11 @@ class Persistence {
    * @private
    */
   static async ensureDirectoryExistsAsync (dir, mode = DEFAULT_DIR_MODE) {
-    await storage.mkdirAsync(dir, { recursive: true, mode })
+    const parsedDir = path.parse(path.resolve(dir))
+    // this is because on Windows mkdir throws a permission error when called on the root directory of a volume
+    if (process.platform !== 'win32' || parsedDir.dir !== parsedDir.root) {
+      await storage.mkdirAsync(dir, { recursive: true, mode })
+    }
   }
 }