From 146284f170d3da88709ec76007f6f7b5ad975d39 Mon Sep 17 00:00:00 2001
From: =?utf8?q?C=C3=B4me=20Chilliet?= <come.chilliet@nextcloud.com>
Date: Thu, 4 May 2023 17:21:05 +0200
Subject: [PATCH] Fix fopen mode
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Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>
---
 apps/encryption/lib/Command/FixLegacyFileKey.php | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/apps/encryption/lib/Command/FixLegacyFileKey.php b/apps/encryption/lib/Command/FixLegacyFileKey.php
index fd3221a6c1f..7a17e637d41 100644
--- a/apps/encryption/lib/Command/FixLegacyFileKey.php
+++ b/apps/encryption/lib/Command/FixLegacyFileKey.php
@@ -112,12 +112,17 @@ class FixLegacyFileKey extends Command {
 					/* If that did not throw and filekey is not empty, a legacy filekey is used */
 					$clean = false;
 					$output->writeln($path . ' is using a legacy filekey, migrating');
-					$file = $this->rootView->fopen($path, 'w+');
+					$file = $this->rootView->fopen($path, 'r+');
 					if ($file) {
-						fwrite($file, '');
+						$firstByte = fread($file, 1);
+						if ($firstByte === false) {
+							$output->writeln('<error>failed to read ' . $path . '</error>');
+							continue;
+						}
+						fwrite($file, $firstByte);
 						fclose($file);
 					} else {
-						$output->writeln('<error>failed to open' . $path . '</error>');
+						$output->writeln('<error>failed to open ' . $path . '</error>');
 					}
 				}
 			}
-- 
2.39.5