since shell_exec does not return command output code, working around by looking at the output itself

Fixes #8525

1 files changed, 4 insertions, 2 deletions

diff --git a/core/Filesystem.php b/core/Filesystem.php
index d50c2d8e28..73a07a54bb 100644
--- a/core/Filesystem.php
+++ b/core/Filesystem.php
@@ -136,9 +136,11 @@ class Filesystem
             $output = @shell_exec($command);
             if ($output) {
                 $output = explode("\n", $output);
-                if (count($output) > 1) {
-                    // check if filesystem is NFS
 
+                $commandFailed = (false !== strpos($output, "no file systems processed"));
+                if (!$commandFailed
+                    && count($output) > 1) {
+                    // check if filesystem is NFS
                     return true;
                 }
             }