fix: create .htaccess file in case it doesn't exist yet

Currently, the updateHtaccess() function can't deal with a missing
.htaccess file, it assumes at least an empty .htaccess file.

In some cases, the file may be missing though, and this commit
adds functionality for creating it when this edgecase occurs.

Signed-off-by: Marc <mail@lpcvoid.com>

Author: lpcvoid

lib/private/Setup.php

@@ -556,6 +556,15 @@ public static function updateHtaccess(): bool {
 
 		$setupHelper = Server::get(\OC\Setup::class);
 
+		// Note: The .htaccess file also needs to exist, otherwise `is_writable()`
+		// will return false, even though the file could be written.
+		// This function writes the .htaccess file in that case.
+		if (!file_exists($setupHelper->pathToHtaccess())) {
+			if (!touch($setupHelper->pathToHtaccess())) {
+				return false;
+			}
+		}
+
 		if (!is_writable($setupHelper->pathToHtaccess())) {
 			return false;
 		}