From b6fa6f8fe475acbd672b53528bb51670f57c4ac8 Mon Sep 17 00:00:00 2001
From: abraunegg <alex.braunegg@gmail.com>
Date: Sat, 2 Aug 2025 07:22:32 +1000
Subject: [PATCH] Fix issue of trying to create the root folder online (#3403)

* Fix issue of trying to create the root folder online (which is denoted by a '.') as this will never be possible.
---
 src/sync.d | 15 ++++++++++++++-
 src/util.d |  6 ++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/src/sync.d b/src/sync.d
index 8835da0f..c244c68c 100644
--- a/src/sync.d
+++ b/src/sync.d
@@ -7907,7 +7907,20 @@ class SyncEngine {
 			displayFunctionProcessingStart(thisFunctionName, logKey);
 		}
 		
-		// Log what we are doing
+		// Is this a valid path to create?
+		// We need to avoid this sort of error:
+		//
+		//		OneDrive generated an error when creating this path: .
+
+		//		ERROR: Microsoft OneDrive API returned an error with the following message:
+		//		  Error Message:       HTTP request returned status code 400 (Bad Request)
+		//		  Error Reason:        Invalid request
+		//		  Error Code:          invalidRequest
+		//		  Error Timestamp:     2025-08-01T21:08:26
+		//		  API Request ID:      dca77bd6-1e9a-432a-bc6c-1c6b5380745d
+		if (isRootEquivalent(thisNewPathToCreate)) return;
+		
+		// Log what path we are attempting to create online
 		if (verboseLogging) {addLogEntry("OneDrive Client requested to create this directory online: " ~ thisNewPathToCreate, ["verbose"]);}
 		
 		// Function variables
diff --git a/src/util.d b/src/util.d
index 8a7cda61..ccf40954 100644
--- a/src/util.d
+++ b/src/util.d
@@ -1396,6 +1396,12 @@ bool hasSHA256HashResume(const ref JSONValue item) {
 	return ("sha256Hash" in item["onlineHash"]) != null;
 }
 
+// Test if a path is the equivalent of root '.'
+bool isRootEquivalent(string inputPath) {
+	auto normalisedPath = buildNormalizedPath(inputPath);
+	return normalisedPath == "." || normalisedPath == "";
+}
+
 // Convert bytes to GB
 string byteToGibiByte(ulong bytes) {
     if (bytes == 0) {